Imaging lens and imaging device

Abstract

The present technology relates to an imaging lens and an imaging device which each make it possible to realize capturing of a high-quality image with a reduced thickness. An imaging lens in accordance with the present invention comprises a lens group which is constituted by eight lenses and which causes an optical image of an object to be formed on an imaging surface that is curved such that the peripheral part thereof tilts toward the object side. A least one surface of a first lens which is closest to the object among the lens group is an aspheric surface. The first lens has positive refractive power. The peripheral part of an imaging-surface-side surface of a second lens which is the second lens from the object side among the lens group has such a shape as to tilt toward the imaging surface side. Both surfaces of a final lens which is closest to the imaging surface among the lens group are aspheric surfaces. The final lens has negative refractive power. The present technology can be applied, for example, to an imaging lens and the like.

Description

Imaging lens and imaging device

[0001] The present technology relates to an imaging lens and an imaging device, and more particularly to an imaging lens and an imaging device that are capable of capturing high-quality images with a low profile.

[0002] Currently, smartphones equipped with multi-lens cameras consisting of a main camera such as a standard camera or a wide-angle camera (Wide) and sub-cameras such as an ultra-wide-angle camera (Ultra-Wide) or a telephoto camera (Tele) are in widespread use.

[0003] In such multi-lens cameras, the demand for higher sensitivity has led to larger image sensors. For example, the image sensor size of the main camera is desired to be 1 / 1.5 to 1 inch, and the image sensor size of the sub-camera is desired to be 1 / 3 to 1 / 2 inch.

[0004] However, increasing the size of the image sensor increases the overall optical length, which in turn increases the thickness of the smartphone. Therefore, for example, increasing the size of the image sensor in the main camera to 1 inch has only been achieved in some smartphones by using a design that makes the protrusion that occurs when the main camera is thicker than the smartphone less noticeable.

[0005] On the other hand, an imaging device having a curved imaging surface has been proposed (see, for example, Patent Document 1).

[0006] International Publication No. 2013 / 027641

[0007] As described above, in mobile devices such as smartphones, it is difficult to increase the size of the image sensor and improve the quality of the captured image due to restrictions on the overall optical length, etc. Therefore, there is a demand for a method to capture high-quality images with a low profile, but such demand has not yet been fully met.

[0008] The present technology has been made in view of such circumstances, and makes it possible to realize high-quality image capture with a low profile.

[0009] an imaging lens according to a first aspect of the present technology, the imaging lens including a lens group consisting of six or more lenses, the lens group including a first lens that is the lens closest to the object side and that forms an optical image of the object on an imaging surface that is curved such that a peripheral portion of the first lens is inclined toward the object side; at least one surface of a first lens that is the lens closest to the object side of the lens group is aspherical, the first lens having positive refractive power; a second lens that is the second lens from the object side of the lens group, the surface on the imaging surface side has a peripheral portion that is inclined toward the imaging surface side; both surfaces of a final lens that is the lens closest to the imaging surface side of the lens group are aspherical, the final lens having negative refractive power; The imaging lens is configured to satisfy the following conditions: -1.0<fL / f<-0.5, -0.1<f / fLF<1.3.

[0010] In a first aspect of the present technology, a lens group consisting of six or more lenses is provided, which forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is tilted toward the object. At least one surface of a first lens, which is the lens closest to the object in the lens group, is aspherical. The first lens has positive refractive power. A second lens, which is the second lens from the object side in the lens group, has a peripheral portion of its surface on the imaging surface side that is shaped to tilt toward the imaging surface. Both surfaces of a final lens, which is the lens closest to the imaging surface in the lens group, are aspherical. The final lens has negative refractive power. When the radius of curvature of the imaging surface is RI, the diagonal length of the imaging surface is 2Y, the focal length of the first lens is f1, the focal length of the final lens is fL, the focal length of the final front lens which is the second lens from the imaging surface side in the lens group is fLF, and the focal length of the entire imaging lens is f, the following conditions are satisfied: -10.0 < RI / 2Y < -1.8, 0.7 < f1 / f < 1.8, -1.0 < fL / f < -0.5, -0.1 < f / fLF < 1.3.

[0011] an imaging device according to a second aspect of the present technology, the imaging device including a lens group consisting of six or more lenses, which forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is inclined toward the object side; at least one surface of a first lens that is the lens closest to the object side of the lens group is aspherical, the first lens having positive refractive power; a peripheral portion of a surface of a second lens that is the second lens from the object side of the lens group, on the imaging surface side, is inclined toward the imaging surface side; both surfaces of a final lens that is the lens closest to the imaging surface side of the lens group are aspherical, the final lens having negative refractive power; An imaging device comprising: an imaging lens configured to satisfy the conditions of -1.0<fL / f<-0.5, -0.1<f / fLF<1.3; and an imaging element having the imaging surface and converting the optical image formed on the imaging surface into an electrical signal.

[0012] According to a second aspect of the present technology, there is provided an imaging lens having a lens group consisting of six or more lenses that forms an optical image of an object on an imaging surface that is curved so that a peripheral portion of the image is inclined toward the object. According to the second aspect of the present technology, there is also provided an imaging element that has the imaging surface and converts the optical image formed on the imaging surface into an electrical signal. At least one surface of a first lens, which is the lens closest to the object, in the lens group is aspherical. The first lens has positive refractive power. A peripheral portion of a surface of a second lens, which is the second lens from the object side in the lens group, on the imaging surface side has a shape that is inclined toward the imaging surface. Both surfaces of a final lens, which is the lens closest to the imaging surface in the lens group, are aspherical. The final lens has negative refractive power. When the radius of curvature of the imaging surface is RI, the diagonal length of the imaging surface is 2Y, the focal length of the first lens is f1, the focal length of the final lens is fL, the focal length of the final front lens which is the second lens from the imaging surface side in the lens group is fLF, and the focal length of the entire imaging lens is f, the following conditions are satisfied: -10.0 < RI / 2Y < -1.8, 0.7 < f1 / f < 1.8, -1.0 < fL / f < -0.5, -0.1 < f / fLF < 1.3.

[0013] 8 is a diagram showing an example of the configuration of a first embodiment of an imaging device having an imaging lens to which the present technology is applied. It is a cross-sectional view showing an example of the configuration of the imaging lens of FIG. 1. It is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 2. It is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 2. It is a table showing examples of aspherical data of the surface of FIG. 2. It is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 2. It is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 2. It is a cross-sectional view showing an example of the configuration of a second embodiment of an imaging lens, infrared cut filter, and imaging surface to which the present technology is applied. It is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 8. It is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 8. It is a table showing examples of aspherical data of the surface of FIG. It is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 8. It is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 8. 14 is a cross-sectional view showing a configuration example of a third embodiment of an imaging lens, an infrared cut filter, and an imaging surface to which the present technology is applied. 15 is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 14. 16 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 14. 17 is a table showing examples of aspherical data of the surface of FIG. 14. 18 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 14. 19 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 14. 19 is a cross-sectional view showing a configuration example of a fourth embodiment of an imaging lens, an infrared cut filter, and an imaging surface to which the present technology is applied. 20 is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 20. 20 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 20. 21 is a table showing examples of aspherical data of the surface of FIG. 20. 22 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 20. 23 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 20. FIG. 10 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a fifth embodiment of the present technology.32 is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 26. FIG. 33 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 26. FIG. 34 is a table showing examples of aspherical data of the surface of FIG. 26. FIG. 35 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 26. FIG. 36 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 26. FIG. 37 is a cross-sectional view showing a configuration example of an imaging lens, infrared cut filter, and imaging surface according to a sixth embodiment to which the present technology is applied. FIG. 38 is a table showing examples of various setting values ​​of the entire imaging lens of FIG. 32. FIG. 39 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 32. FIG. 39 is a table showing examples of aspherical data of the surface of FIG. 32. FIG. 39 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of FIG. 32. FIG. 39 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of FIG. 32. FIG. 39 is a cross-sectional view showing a configuration example of an imaging lens, infrared cut filter, and imaging surface according to a seventh embodiment to which the present technology is applied. 44 is a table showing examples of various setting values ​​of the entire imaging lens of Fig. 38. 45 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of Fig. 38. 46 is a table showing examples of aspherical data of the surface of Fig. 38. 47 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of Fig. 38. 48 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of Fig. 38. 49 is a cross-sectional view showing a configuration example of an eighth embodiment of an imaging lens, an infrared cut filter, and an imaging surface to which the present technology is applied. 49 is a table showing examples of various setting values ​​of the entire imaging lens of Fig. 44. 49 is a table showing examples of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of Fig. 44. 49 is a table showing examples of aspherical data of the surface of Fig. 44. 49 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion aberration that occur in the imaging lens of Fig. 44. 49 is a lateral aberration diagram showing examples of lateral aberration that occur in the imaging lens of Fig. 44. 50 is a cross-sectional view showing a configuration example of a ninth embodiment of an imaging lens, an infrared cut filter, and an imaging surface to which the present technology is applied. 51 is a table showing examples of various setting values ​​for the entire imaging lens of Fig. 50. 52 is a table showing examples of various setting values ​​for the aperture stop, lens, infrared cut filter, and imaging element of Fig. 50.56. A table showing an example of aspherical data of the surface of FIG. 50. A longitudinal aberration diagram showing an example of spherical aberration, field curvature, and distortion aberration that occurs in the imaging lens of FIG. 50. A lateral aberration diagram showing an example of lateral aberration that occurs in the imaging lens of FIG. 50. A cross-sectional view showing an example configuration of an imaging lens, an infrared cut filter, and an imaging surface according to a tenth embodiment to which the present technology is applied. A table showing an example of various setting values ​​of the entire imaging lens of FIG. 56. A table showing an example of various setting values ​​of the aperture stop, lens, infrared cut filter, and imaging element of FIG. 56. A table showing an example of aspherical data of the surface of FIG. 56. A table showing an example of aspherical data of another surface of FIG. 56. A longitudinal aberration diagram showing an example of spherical aberration, field curvature, and distortion aberration that occurs in the imaging lens of FIG. 56. A lateral aberration diagram showing an example of lateral aberration that occurs in the imaging lens of FIG. 56. A table showing values ​​of various parameters in an imaging lens. A block diagram showing an example hardware configuration of a smartphone as an electronic device to which the present technology is applied. A diagram explaining an example use of an imaging device. A diagram showing an example of a schematic configuration of an endoscopic surgery system. It is a block diagram showing an example of the functional configuration of a camera head and a CCU.It is a block diagram showing an example of the schematic configuration of a vehicle control system.It is an explanatory diagram showing an example of the installation position of an imaging unit.

[0014] DETAILED DESCRIPTION OF THE INVENTION Hereinafter, modes for carrying out the present technology (hereinafter referred to as embodiments) will be described. The description will be made in the following order. 1. First embodiment (imaging device having eight lenses) 2. Second embodiment (imaging device having eight lenses) 3. Third embodiment (imaging device having eight lenses) 4. Fourth embodiment (imaging device having eight lenses) 5. Fifth embodiment (imaging device having eight lenses) 6. Sixth embodiment (imaging device having eight lenses) 7. Seventh embodiment (imaging device having seven lenses) 8. Eighth embodiment (imaging device having six lenses) 9. Ninth embodiment (imaging device having eight lenses) 10. Tenth embodiment (imaging device having a curved infrared cut filter) 11. Parameters 12. Application example to electronic device 13. Use example of imaging device 14. Application example to endoscopic surgery system 15. Application example to moving body

[0015] In the drawings referred to in the following description, identical or similar parts are denoted by identical or similar reference numerals, and redundant explanations will be omitted where appropriate. The drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc. may differ from the actual ones. Furthermore, there may be parts in which the dimensional relationships and ratios differ between the drawings.

[0016] Furthermore, the definitions of directions such as up and down in the following description are merely for the convenience of explanation and do not limit the technical idea of ​​the present disclosure. For example, if an object is rotated 90 degrees and observed, up and down are converted to left and right and read, and if it is rotated 180 degrees and observed, up and down are read inverted.

[0017] The technology of the present disclosure can be applied to imaging lenses in general that focus visible light, infrared light, light in other wavelength bands, etc., which are included in imaging devices mounted mainly on small devices such as mobile devices. Below, an example in which the technology of the present disclosure is applied to an imaging lens that focuses visible light will be described.

[0018] 1. First Embodiment Configuration Example of Imaging Device FIG. 1 is a diagram showing a configuration example of a first embodiment of an imaging device having an imaging lens to which the present technology is applied.

[0019] The imaging device 100 (camera) in Fig. 1 is composed of an imaging unit 101, an input unit 102, a lens drive control unit 103, an image sensor drive control unit 104, and a signal processing unit 105. In Fig. 1, a side cross section including the optical axis of the imaging unit 101 is shown to explain the configuration of the imaging unit 101. The dotted line in Fig. 1 indicates the optical axis.

[0020] The imaging unit 101 is composed of a circuit board 111 , an imaging element unit 112 , a filter holder 113 , an infrared cut filter 114 , a lens holder 115 , an imaging lens 116 , and an actuator 117 .

[0021] The circuit board 111 is a flexible printed circuit board. The imaging element section 112 is packaged and provided on the circuit board 111. The imaging element section 112 includes a package 131, a base 132, an imaging element 133, and wires 134.

[0022] The package 131 is provided on the circuit board 111 and is electrically connected to the circuit board 111. The base 132 is provided on the package 131 in order to maintain the shape of the image sensor 133 curved concavely toward the object side. The object-side surface of the base 132 is curved concavely toward the object side to match the shape of the image sensor 133. The image sensor 133 is bonded to the object-side surface of the base 132. As a result, both the object-side surface of the image sensor 133 and the surface of the base 132 are curved concavely toward the object side.

[0023] The image sensor 133 (solid-state image sensor) is a CCD (Charge-Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor formed on a thinned semiconductor substrate, and captures an image of an object.

[0024] Specifically, an imaging surface 133a is provided on the object-side surface of the image sensor 133. Therefore, the imaging surface 133a has a curved shape that is concave toward the object side, i.e., the peripheral portion is curved so as to tilt toward the object side. The imaging surface 133a is preferably formed of a spherical surface, which is generally easy to manufacture, but may be formed of an aspherical surface, a free-form surface, or the like, depending on design and manufacturing considerations. When the imaging surface 133a is an aspherical surface, the degree of freedom in correcting various aberrations, including field curvature, can be further increased.

[0025] An optical image of an object is formed on the imaging surface 133a by light incident from the object through the imaging lens 116. The imaging element 133 converts the light corresponding to the optical image of the object formed on the imaging surface 133a into an electrical signal on a pixel-by-pixel basis, and performs AD conversion or the like on the electrical signal to generate an image signal, which is a digital signal.

[0026] The imaging element 133 is electrically connected to a circuit formed on the upper surface of the package 131 by wire bonding using a wire 134. An image signal generated by the imaging element 133 is supplied to the signal processing unit 105 via the circuit of the package 131, the circuit board 111, etc.

[0027] The image sensor 133 is driven based on an image sensor drive control signal supplied from the image sensor drive control unit 104 via the circuit board 111, the circuit of the package 131, etc. For example, based on an image sensor drive control signal that indicates a method for reading out an electrical signal and effective pixels, which are pixels of all the pixels of the image sensor 133 from which an electrical signal is to be read out, the image sensor 133 reads out the electrical signals of effective pixels using that readout method.

[0028] The filter holder 113 is formed to surround the periphery of the image pickup element unit 112 and holds an infrared cut filter 114. The filter holder 113 fixes an actuator 117.

[0029] The infrared cut filter 114 is a parallel-plate filter having a surface 114a on the object side and a surface 114b on the imaging surface 133a side. The infrared cut filter 114 transmits light other than infrared light emitted from the imaging lens 116 and has no optical power. The light that has transmitted through the infrared cut filter 114 is emitted to the imaging surface 133a.

[0030] The infrared cut filter 114 may not be provided, or a band-pass filter such as an optical low-pass filter may be provided instead of the infrared cut filter 114. The position of the infrared cut filter 114 can be any position that can be easily formed during manufacturing.

[0031] The infrared cut filter 114 may be integrated with the lens or the image sensor 133 constituting the imaging lens 116 by multi-layer coating, material addition, or surface coating of an infrared absorbing agent or the like on the lens or the image sensor 133. The infrared cut filter 114 has a film shape, and may be bonded to a cover glass (not shown), the lens constituting the imaging lens 116, the image sensor 133, or the like, thereby being integrated with the cover glass, lens, image sensor 133, etc. When the infrared cut filter 114 is integrated with the cover glass, lens, image sensor 133, etc., it is possible to effectively utilize the back focus space and shorten the overall optical length of the imaging lens 116.

[0032] The lens holder 115 holds a small imaging lens 116 on the object side of the imaging element 133. The imaging lens 116 is a wide-angle lens with a focal length shorter than 50 mm (equivalent to a 35 mm camera), which is similar to that of the human eye. The configuration of the imaging lens 116 will be described in detail with reference to FIG. 2, which will be described later. The imaging lens 116 collects light from an object and forms an optical image on the imaging surface 133 a.

[0033] The actuator 117 drives the imaging lens 116 in accordance with a lens drive control signal supplied from the lens drive control unit 103 .

[0034] In the imaging unit 101 configured as described above, light from an object is incident on the imaging surface 133a via the imaging lens 116 and the infrared cut filter 114, and an optical image is formed on the imaging surface 133a. This optical image is converted into an electrical signal by the imaging element 133 and captured.

[0035] The input unit 102 receives input from a user or the like, and supplies instructions corresponding to the input to the lens drive control unit 103 and the image sensor drive control unit 104 .

[0036] The lens drive control unit 103 generates a lens drive control signal in response to an instruction from the input unit 102 and supplies the signal to the actuator 117 to drive the imaging lens 116. For example, the lens drive control unit 103 generates a lens drive control signal in response to an instruction on the angle of view supplied from the input unit 102, thereby driving the imaging lens 116 so that an optical image of the angle of view is formed on the imaging surface 133 a.

[0037] The image sensor drive control unit 104 generates an image sensor drive control signal in response to an instruction from the input unit 102, and supplies the signal to the image sensor 133 to drive the image sensor 133. For example, the image sensor drive control unit 104 generates an image sensor drive control signal in response to an instruction to start shooting, etc., supplied from the input unit 102, and supplies the signal to the image sensor 133 to start reading out an electrical signal.

[0038] The signal processing unit 105 stores the image signal output from the image sensor 133 in a built-in memory as necessary. The signal processing unit 105 performs various types of signal processing on the image signal, and outputs the result as a captured image.

[0039] The input unit 102, lens drive control unit 103, image sensor drive control unit 104, and signal processing unit 105 may be arranged on the circuit board 111 or package 131, or on another substrate. The substrate of the signal processing unit 105 and the semiconductor substrate that constitutes the image sensor 133 may be stacked.

[0040] In the example of FIG. 1, the package 131 and the imaging element 133 are electrically connected by wire bonding, but they may also be electrically connected by through electrodes.

[0041] <Configuration Example of Imaging Lens> FIG. 2 is a cross-sectional view showing a configuration example of the imaging lens 116 in FIG.

[0042] The imaging lens 116 in FIG. 2 is made up of a lens group 161 and an aperture stop 162 .

[0043] Lens group 161 is composed of eight aspherical lenses 171 to 178. The eight lenses 171 to 178 are arranged in order from the object side (left side in FIG. 2) toward the imaging surface 133a side (right side in FIG. 2). Lens 171 (first lens) closest to the object side of lens group 161 has a surface 171a facing the object side and a surface 171b facing the imaging surface 133a side. Similarly, lenses 172 to 178 have surfaces 172a and 172b, surfaces 173a and 173b, surfaces 174a and 174b, surfaces 175a and 175b, surfaces 176a and 176b, surfaces 177a and 177b, and surfaces 178a and 178b, respectively. Surfaces 171a to 178a and 171b to 178b are aspherical.

[0044] Lens 171 has a meniscus shape with its convex surface facing the object side. The peripheral portion of surface 172b of lens 172 (second lens), which is the second lens from the object side in lens group 161, has a shape that tilts toward the imaging surface 133a. Lens 171 has positive refractive power, and lens 178 (final lens) of lens group 161, which is closest to the imaging surface 133a, has negative refractive power. Surface 177a of lens 177 (final front lens), which is the second lens from the imaging surface 133a in lens group 161, and surface 178a of lens 178 have extrema. An extrema is a point on the optical axis other than the vertex of the surface where the inclination of the surface is zero.

[0045] The aperture stop 162 is disposed between the surfaces 171 a and 171 b and limits the light incident on the lens 171 .

[0046] Light incident on the imaging lens 116 from an object is emitted via the lenses 171 to 178 and the infrared cut filter 114, and is collected on the imaging surface 133a.

[0047] In the following, point A on the optical axis of surface 178b １ and point B on the optical axis of the imaging surface 133a １ Line segment A connecting １ B １ The distance between the surface 178b and the imaging surface 133a on the optical axis is BF0 １ The point C of the most convex part of the surface 178b that protrudes furthest toward the imaging surface 233a is called １ and point C １ Intersection D between a line parallel to the optical axis passing through the imaging surface 133a １ Line segment C connecting １ D １ The distance between the two points is １ and the distance in the optical axis direction of the imaging surface 133a is BFC １ It is called.

[0048] Here, since the infrared cut filter 114 is disposed between the surface 178b and the imaging surface 133a, the thickness of the infrared cut filter 114 is calculated as an air-equivalent distance, and the distance BF0 １ and BFC １This also applies to the case where, instead of the infrared cut filter 114, another optical member such as a band-pass filter or a seal glass (not shown) of the image sensor unit 112 is disposed between the surface 178b and the image capturing surface 133a.

[0049] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 3 is a table showing examples of various setting values ​​for the entire imaging lens 116. In FIG.

[0050] As shown in FIG. 3, the focal length f １ The maximum angle of view of the imaging lens 116 is 2ω. １ is 105.6 degrees. １ is 1.95. The diagonal length 2Y of the imaging surface 133a １ The distance L on the optical axis from the surface 171a to the image-side focal point, which is the image point when a ray of light parallel to the optical axis is incident on the imaging lens 116, is 16.384 mm. １ When an optical member such as the infrared cut filter 114 is disposed between the surface 178b and the image-side focal point, the thickness of the optical member is 8.03 mm. １ and BFC １ As with the calculation of , it is calculated using air equivalent distance.

[0051] <Examples of Various Setting Values ​​of Aperture Stop, Lenses, Infrared Cut Filter, and Image Sensor> FIG. 4 is a table showing examples of various setting values ​​of the aperture stop 162, lenses 171 to 178, infrared cut filter 114, and image sensor 133.

[0052] The table in FIG. 4 lists, for each of the surfaces of aperture stop 162, surfaces 171a to 178a, 171b to 178b, 114a, and 114b, and imaging surface 133a, the components of imaging lens 116 that include that surface and the setting values ​​of that surface.

[0053] These setting values ​​include the radius of curvature R [mm] and axial surface spacing T [mm] of the center of the corresponding surface, the refractive index Nd of the material of the component including the corresponding surface at the d-line (wavelength 587.6 nm), and the Abbe number vd of that material. The axial surface spacing T of the surfaces of the aperture stop 162 is the distance on the optical axis from the aperture stop 162 to the object-side surface 171a of the lens 171 between which the aperture stop 162 is disposed. The axial surface spacing T of each of the surfaces 171a-178a, 171b-178b, 114a, and 114b is the distance on the optical axis between that surface and the nearest surface on the imaging plane 133a side. The Abbe number vd is expressed as (Nd-1) / (NF-NC), where Nd is the refractive index for the d-line, NF is the refractive index for the F-line, and Nc is the refractive index for the C-line.

[0054] The surface of the aperture stop 162 is flat, and therefore the radius of curvature R of that surface is infinity (INF), as shown in Fig. 4. The on-axis surface spacing T of the surface of the aperture stop 162 is -0.531. As shown in Fig. 2, the on-axis surface spacing T of the surface 171a is negative because it is located closer to the object than the aperture stop 162.

[0055] The radius of curvature R of surface 171a is 2.9029, and the on-axis surface distance T from surface 171b is 0.571. The refractive index Nd of the material of lens 171 having surface 171a is 1.5449, and the Abbe number vd is 56.3. The radius of curvature R of surface 171b is 5.1407, and the on-axis surface distance T from surface 172a is 0.339.

[0056] The radii of curvature R and on-axis surface spacing T of the surfaces 172a to 178a and 172b to 178b, as well as the refractive index Nd and Abbe number vd of the lenses 172 to 178, are shown in the table of FIG.

[0057] Because surfaces 114a and 114b are flat, the radii of curvature R of surfaces 114a and 114b are infinite. The on-axis surface spacing T between surfaces 114a and 114b, as well as the refractive index Nd and Abbe number vd of infrared cut filter 114, are shown in the table of Fig. 4. The radius of curvature R of imaging surface 133a is -65.9951.

[0058] <Example of Aspherical Data for Each Lens Surface> FIG. 5 is a table showing an example of aspherical data for the surfaces 171a to 178a and 171b to 178b.

[0059] 5 lists the aspherical data for each of the surfaces 171a to 178a and 171b to 178b, including the conical coefficient K and the ith aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20).

[0060] The conic coefficient K (conic constant) and the i-th aspherical coefficient Ai are coefficients used to calculate the amount of sag X of the aspherical surface in the X-axis direction using the following equation (a), where the vertex of the surface is the origin and the optical axis is the X-axis:

[0061]

[0062] In formula (a), h is the length (height) in the direction perpendicular to the X axis, and R is the radius of curvature.

[0063] 5, the conic coefficient K of the surface 171a is 1.1359. The fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A10, and the twelfth-order aspherical coefficient A12 are −4.96484×10 －３ , 8.35049×10 －３ , -2.04071×10 －２ , 2.84789×10 －２ , -2.43322×10 －２ The 14th-order aspherical coefficient A14, the 16th-order aspherical coefficient A16, the 18th-order aspherical coefficient A18, and the 20th-order aspherical coefficient A20 are 1.28848×10 －２ , -4.11940×10 －３ , 7.27876×10 －４ , -5.44075×10 －５ is.

[0064] The aspherical data of the surfaces 172a to 178a and 171b to 178b are the values ​​shown in the table of FIG.

[0065] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 6 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 116. In FIG.

[0066] Fig. 6A is a graph showing the spherical aberration generated in the imaging lens 116 for each wavelength of light, 486.1327 nm, 587.5618 nm, and 656.2725 nm. In the graph of Fig. 6A, the horizontal axis represents the spherical aberration [mm], and the vertical axis represents the normalized coordinate, which is the ratio of the distance from the optical axis to the pupil diameter of the incident position of a light ray. This also applies to Figs. 12A, 18A, 24A, 30A, 36A, 42A, 48A, 54A, and 61A, which will be described later.

[0067] FIG. 6B is a graph showing the field curvature of light having a wavelength of 587.5618 nm generated in the imaging lens 116. In the graph of FIG. 6B, the horizontal axis represents the field curvature [mm], and the vertical axis represents the image height [mm]. In FIG. 6B, the dotted line represents the relationship between the field curvature in the tangential direction and the image height, and the solid line represents the relationship between the field curvature in the sagittal direction and the image height. The same applies to FIG. 12B, FIG. 18B, FIG. 24B, FIG. 30B, FIG. 36B, FIG. 42B, FIG. 48B, FIG. 54B, and FIG. 61B, which will be described later.

[0068] Fig. 6C is a graph showing distortion aberration of light with a wavelength of 587.5618 nm that occurs in the imaging lens 116. In the graph of Fig. 6C, the horizontal axis represents distortion aberration [%] and the vertical axis represents image height [mm]. This also applies to Figs. 12C, 18C, 24C, 30C, 36C, 42C, 48C, 54B, and 61B, which will be described later.

[0069] <Example of Lateral Aberration> FIG. 7 is a diagram showing an example of lateral aberration occurring in the imaging lens 116. In FIG.

[0070] FIG. 7 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 116 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0071] Specifically, the graphs on the left of A to E in Fig. 7 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 7 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0072] In the graphs A to E in Fig. 7, the vertical axis represents lateral aberration [mm], and the horizontal axis represents the entrance pupil coordinate, which is the coordinate representing the ratio of the position of the incident ray in a direction perpendicular to the optical axis to the pupil diameter when the optical axis is set to 0. This also applies to A to E in Fig. 13, 19, 25, 31, 37, 43, 49, 55, and 62, which will be described later.

[0073] As shown in FIGS. 6 and 7, the imaging lens 116 has good aberration correction and has good imaging quality.

[0074] In the imaging lens 116, as long as at least one of the surfaces 171a and 171b is aspherical, both surfaces do not have to be aspherical.

[0075] 2. Second Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A second embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0076] FIG. 8 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a second embodiment to which the present technology is applied.

[0077] The infrared cut filter 214 in FIG. 8 differs from the infrared cut filter 114 in that it has surfaces 214a and 214b instead of the surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0078] The imaging lens 216 is composed of a lens group 261 and an aperture stop 262 .

[0079] The lens group 261 is composed of eight aspherical lenses 271 to 278. The eight lenses 271 to 278 are arranged in order from the object side (left side in FIG. 8) toward the imaging surface 233a side (right side in FIG. 8). The lens 271 (first lens) closest to the object side of the lens group 261 has a surface 271a facing the object side and a surface 271b facing the imaging surface 233a side. Similarly, the lenses 272 to 278 have surfaces 272a and 272b, surfaces 273a and 273b, surfaces 274a and 274b, surfaces 275a and 275b, surfaces 276a and 276b, surfaces 277a and 277b, and surfaces 278a and 278b, respectively. Surfaces 271a to 278a and 271b to 278b are aspherical.

[0080] The lens 271 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 272b of the second lens 272 (second lens) from the object side in the lens group 261 has a shape that tilts toward the imaging surface 233a. The lens 271 has positive refractive power, and the lens 278 (final lens) in the lens group 261 that is closest to the imaging surface 233a has negative refractive power. The surface 277a of the second lens 277 (final front lens) from the imaging surface 233a in the lens group 261 and the surface 278a of the lens 278 have extrema.

[0081] The aperture stop 262 is disposed between the surfaces 271 a and 271 b and limits the light incident on the lens 271 .

[0082] Light incident on the imaging lens 216 from an object is emitted via the lenses 271 to 278 and the infrared cut filter 214, and is collected on the imaging surface 233a.

[0083] In the following, point A on the optical axis of surface 278b ２ and point B on the optical axis of the imaging surface 233a ２ Line segment A connecting ２ B ２ The distance between the surface 278b and the imaging surface 233a on the optical axis is BF0 ２ The most convex point C of the surface 278b is called ２ and point C ２ Intersection D between a line parallel to the optical axis passing through the imaging surface 233a ２ Line segment C connecting２ D ２ The distance between the two points is ２ and the distance in the optical axis direction of the imaging surface 233a is BFC ２ Distance BF0 ２ and BFC ２ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 214 is calculated in terms of the air equivalent distance.

[0084] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 9 is a table showing examples of various setting values ​​for the entire imaging lens 216. In FIG.

[0085] As shown in FIG. 9, the focal length f ２ The maximum angle of view of the imaging lens 216 is 2ω. ２ The F-number Fno of the imaging lens 216 is 85.2 degrees. ２ is 1.85. The diagonal length 2Y of the imaging surface 233a ２ The distance L on the optical axis from the surface 271a to the image-side focal point of the imaging lens 216 is 16.384 mm. ２ is 9.38 mm. Distance L ２ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 414 is calculated in terms of the air equivalent distance.

[0086] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 10 is a table showing examples of various setting values ​​for the aperture stop 262, lenses 271 to 278, infrared cut filter 214, and image sensor having the image sensor surface 233a.

[0087] 10 lists the components of imaging lens 216 including the surface of aperture stop 262, surfaces 271a to 278a, 271b to 278b, 214a, and 214b, and imaging surface 233a, as well as the setting values ​​of the surface. The setting value items are the same as those in FIG. 6.

[0088] Because the surface of the aperture stop 262 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 10. The axial surface spacing T of the aperture stop 262, which is the distance on the optical axis from the aperture stop 262 to the surface 271a, is -1.132. As shown in Fig. 8, because the surface 271a is located closer to the object side than the aperture stop 262, the axial surface spacing T has a negative value.

[0089] The radius of curvature R of surface 271a is 3.1278, and the on-axis surface distance T from surface 271b is 1.079. The refractive index Nd of the material of lens 271 having surface 271a is 1.5449, and the Abbe number vd is 56.3. The radius of curvature R of surface 271b is 10.6857, and the on-axis surface distance T from surface 272a is 0.056.

[0090] The radii of curvature R and on-axis surface spacing T of the surfaces 272a to 278a and 272b to 278b, as well as the refractive index Nd and Abbe number vd of the lenses 272 to 278, are shown in the table of FIG.

[0091] Because the surfaces 214a and 214b are flat, the radii of curvature R of the surfaces 214a and 214b are infinite. The on-axis surface spacing T between the surfaces 214a and 214b, as well as the refractive index Nd and Abbe number vd of the infrared cut filter 214, are shown in the table of Fig. 10. The radius of curvature R of the imaging surface 233a is -150.0000.

[0092] <Example of Aspherical Data for Each Lens Surface> FIG. 11 is a table showing an example of aspherical data for the surfaces 271a to 278a and 271b to 278b.

[0093] 11 lists the aspherical data for each of the surfaces 271a to 278a and 271b to 278b, including the conical coefficient K and the i-th aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30).

[0094] 11, the conic coefficient K of the surface 271a is 0.2082. The fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A10, and the twelfth-order aspherical coefficient A12 are −5.67447×10－４ , 6.94035×10 －４ , -1.21612×10 －３ , 1.10095×10 －３ , -5.76822×10 －４ The 14th-order aspherical coefficient A14, the 16th-order aspherical coefficient A16, the 18th-order aspherical coefficient A18, and the 20th-order aspherical coefficient A20 are 1.80868×10 －４ , -3.35181×10 －５ , 3.38807×10 －６ , -1.43774×10 －７ The 22nd-order aspherical coefficient A22, the 24th-order aspherical coefficient A24, the 26th-order aspherical coefficient A26, the 28th-order aspherical coefficient A28, and the 30th-order aspherical coefficient A30 are all zero.

[0095] The aspherical data of the surfaces 272a to 278a and 271b to 278b are the values ​​shown in the table of FIG.

[0096] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 12 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 216. In FIG.

[0097] Fig. 12A is a graph showing spherical aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 216. Fig. 12B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 216. Fig. 12C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 216.

[0098] <Example of Lateral Aberration> FIG. 13 is a diagram showing an example of lateral aberration occurring in the imaging lens 216. In FIG.

[0099] FIG. 13 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 216 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0100] Specifically, the graphs on the left of A to E in Fig. 13 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 13 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0101] As shown in FIGS. 12 and 13, the imaging lens 216 has good aberration correction and has good imaging quality.

[0102] In the imaging lens 216, as long as at least one of the surfaces 271a and 271b is aspherical, both surfaces do not have to be aspherical.

[0103] 3. Third Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A third embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0104] FIG. 14 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a third embodiment to which the present technology is applied.

[0105] The infrared cut filter 314 in FIG. 14 differs from the infrared cut filter 114 in that it has surfaces 314a and 314b instead of the surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0106] The imaging lens 316 in FIG. 14 is composed of a lens group 361 and an aperture stop 362 .

[0107] Lens group 361 is composed of eight aspherical lenses, lenses 371 to 378. The eight lenses 371 to 378 are arranged in order from the object side (left side in FIG. 14) toward the imaging surface 333a side (right side in FIG. 14). Lens 371 (first lens), which is the lens closest to the object side of lens group 361, has a surface 371a facing the object side and a surface 371b facing the imaging surface 333a side. Similarly, lenses 372 to 378 have surfaces 372a and 372b, surfaces 373a and 373b, surfaces 374a and 374b, surfaces 375a and 375b, surfaces 376a and 376b, surfaces 377a and 377b, and surfaces 378a and 378b, respectively. Surfaces 371a to 378a and 371b to 378b are aspherical.

[0108] The lens 371 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 372b of the second lens 372 (second lens) from the object side of the lens group 361 has a shape that tilts toward the imaging surface 333a. The lens 371 has positive refractive power, and the lens 378 (final lens) of the lens group 361 that is closest to the imaging surface 333a has negative refractive power. The surface 377a of the second lens 377 (final front lens) from the imaging surface 333a of the lens group 361 and the surface 378a of the lens 378 have extrema.

[0109] The aperture stop 362 is disposed between the surfaces 371 a and 371 b and limits the light incident on the lens 371 .

[0110] Light incident on the imaging lens 316 from an object is emitted via the lenses 371 to 378 and the infrared cut filter 314, and is collected on the imaging surface 333a.

[0111] In the following, point A on the optical axis of surface 378b ３ and point B on the optical axis of the imaging surface 333a ３ Line segment A connecting ３ B ３ The distance between the surface 378b and the imaging surface 333a on the optical axis is BF0 ３ The most convex point C of the surface 378b ３ and point C ３ Intersection D between a line parallel to the optical axis passing through the imaging surface 333a ３ Line segment C connecting ３ D３ The distance between the two points is ３ The distance in the optical axis direction between the image pickup surface 333a and BFC ３ Distance BF0 ３ and BFC ３ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 314 is calculated in terms of the air equivalent distance.

[0112] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 15 is a table showing examples of various setting values ​​for the entire imaging lens 316. In FIG.

[0113] As shown in FIG. 15, the focal length f ３ The maximum angle of view of the imaging lens 316 is 2ω. ３ The F-number Fno of the imaging lens 316 is 85.5 degrees. ３ is 2.00. The diagonal length 2Y of the imaging surface 333a ３ The distance L on the optical axis from the surface 371a to the image-side focal point of the imaging lens 316 is 16.384 mm. ３ is 9.73 mm. Distance L ３ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 414 is calculated in terms of the air equivalent distance.

[0114] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 16 is a table showing examples of various setting values ​​for aperture stop 362, lenses 371 to 378, infrared cut filter 314, and an image sensor having image sensing surface 333a.

[0115] 16 lists the components of imaging lens 316 including the surface of aperture stop 362, surfaces 371a to 378a, 371b to 378b, 314a, and 314b, and imaging surface 333a, and the setting values ​​of the surface. The setting value items are the same as those in FIG. 6.

[0116] Because the surface of the aperture stop 362 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 16. The axial surface spacing T of the aperture stop 362, which is the distance on the optical axis from the aperture stop 362 to the surface 371a, is -0.570. As shown in Fig. 14, because the surface 371a is located closer to the object side than the aperture stop 362, the axial surface spacing T has a negative value.

[0117] The radius of curvature R of surface 371a is 3.4919, and the on-axis surface distance T from surface 371b is 0.572. The refractive index Nd of the material of lens 371 having surface 371a is 1.5449, and the Abbe number vd is 56.3. The radius of curvature R of surface 371b is 5.5850, and the on-axis surface distance T from surface 372a is 0.382.

[0118] The radii of curvature R and on-axis surface spacing T of the surfaces 372a to 378a and 372b to 378b, as well as the refractive index Nd and Abbe number vd of the lenses 372 to 378, are shown in the table of FIG.

[0119] Because surfaces 314a and 314b are flat, the radii of curvature R of surfaces 314a and 314b are infinite. The on-axis surface spacing T between surfaces 314a and 314b, as well as the refractive index Nd and Abbe number vd of infrared cut filter 314, are shown in the table of Fig. 16. The radius of curvature R of imaging surface 333a is -143.9117.

[0120] <Example of Aspherical Data for Each Lens Surface> FIG. 17 is a table showing an example of aspherical data for the surfaces 371a to 378a and 371b to 378b.

[0121] 17 lists aspherical data for each of the surfaces 371a to 378a and 371b to 378b, including a conic coefficient K and an ith aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20).

[0122] 17, the conic coefficient K of the surface 371a is −2.9541. The fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A10, and the twelfth-order aspherical coefficient A12 are 5.75248×10 －３, 1.68997×10 －４ , -8.89355×10 －４ , 4.78010×10 －４ , -1.79343×10 －４ The 14th-order aspherical coefficient A14, the 16th-order aspherical coefficient A16, the 18th-order aspherical coefficient A18, and the 20th-order aspherical coefficient A20 are 4.25908×10 －５ , -6.11941×10 －６ , 5.76882×10 －７ , -3.25135×10 －８ is.

[0123] The aspherical data of the surfaces 372a to 378a and 371b to 378b are the values ​​shown in the table of FIG.

[0124] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 18 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 316. In FIG.

[0125] Fig. 18A is a graph showing spherical aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 316. Fig. 18B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 316. Fig. 18C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 316.

[0126] <Example of Transverse Aberration> FIG. 19 is a transverse aberration diagram showing an example of transverse aberration occurring in the imaging lens 316. In FIG.

[0127] FIG. 19 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 316 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0128] Specifically, the graphs on the left of A to E in Fig. 19 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively. The graphs on the right of A to E in Fig. 19 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0129] As shown in FIGS. 18 and 19, the imaging lens 316 has good aberration correction and has good imaging quality.

[0130] In the imaging lens 316, as long as at least one of the surfaces 371a and 371b is aspherical, both surfaces do not have to be aspherical.

[0131] 4. Fourth Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A fourth embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0132] FIG. 20 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a fourth embodiment to which the present technology is applied.

[0133] The infrared cut filter 414 of FIG. 20 differs from the infrared cut filter 114 in that it has surfaces 414a and 414b instead of the surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0134] The imaging lens 416 in FIG. 20 is composed of a lens group 461 and an aperture stop 462 .

[0135] Lens group 461 is composed of eight aspherical lenses 471 to 478. The eight lenses 471 to 478 are arranged in order from the object side (left side in FIG. 20) toward the imaging surface 433a side (right side in FIG. 20). Lens 471 (first lens) closest to the object side of lens group 461 has a surface 471a facing the object side and a surface 471b facing the imaging surface 433a side. Similarly, lenses 472 to 478 have surfaces 472a and 472b, surfaces 473a and 473b, surfaces 474a and 474b, surfaces 475a and 475b, surfaces 476a and 476b, surfaces 477a and 477b, and surfaces 478a and 478b, respectively. Surfaces 471a to 478a and 471b to 478b are aspherical.

[0136] The lens 471 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 472b of the second lens 472 (second lens) from the object side in the lens group 461 has a shape that tilts toward the imaging surface 433a. The lens 471 has positive refractive power, and the lens 478 (final lens) in the lens group 461 that is closest to the imaging surface 433a has negative refractive power. The surface 477a of the second lens 477 (final front lens) from the imaging surface 433a in the lens group 461 and the surface 478a of the lens 478 have extrema.

[0137] The aperture stop 462 is disposed between the surfaces 471 a and 471 b and limits the light incident on the lens 471 .

[0138] Light incident on the imaging lens 416 from an object is emitted via the lenses 471 to 478 and the infrared cut filter 414, and is collected on the imaging surface 433a.

[0139] In the following, point A on the optical axis of surface 478b ４ and point B on the optical axis of the imaging surface 433a ４ Line segment A connecting ４ B ４ The distance between the surface 478b and the imaging surface 433a on the optical axis is BF0 ４ The most convex point C of the surface 478b is called ４ and point C ４ Intersection D between a line parallel to the optical axis passing through the imaging surface 433a ４ Line segment C connecting ４ D４ The distance between the two points is ４ The distance in the optical axis direction between the image pickup surface 433a and BFC ４ Distance BF0 ４ and BFC ４ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 414 is calculated in terms of the air equivalent distance.

[0140] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 21 is a table showing examples of various setting values ​​for the entire imaging lens 416. In FIG.

[0141] As shown in FIG. 21, the focal length f ４ The maximum angle of view of the imaging lens 416 is 2ω. ４ The F-number Fno of the imaging lens 416 is 72.5 degrees. ４ is 1.77. The diagonal length 2Y of the imaging surface 433a ４ The distance L on the optical axis from the surface 471a to the image-side focal point of the imaging lens 416 is 16.384 mm. ４ is 10.68 mm. Distance L ４ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 414 is calculated in terms of the air equivalent distance.

[0142] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 22 is a table showing examples of various setting values ​​for aperture stop 462, lenses 471 to 478, infrared cut filter 414, and an image sensor having image sensing surface 433a.

[0143] 22 lists the components of imaging lens 416 including the surface of aperture stop 462, surfaces 471a to 478a, 471b to 478b, 414a, and 414b, and imaging surface 433a, as well as the setting values ​​of the surface. The setting value items are the same as those in FIG. 6.

[0144] Because the surface of the aperture stop 462 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 22. The on-axis surface spacing T of the surface of the aperture stop 462, which is the distance on the optical axis from the aperture stop 462 to the surface 471a, is -1.363. As shown in Fig. 20, because the surface 471a is located closer to the object side than the aperture stop 462, the on-axis surface spacing T has a negative value.

[0145] The radius of curvature R of surface 471a is 3.4291, and the on-axis surface distance T between surface 471a and surface 471b is 1.519. The refractive index Nd of the material of lens 471 having surface 471a is 1.5449, and the Abbe number vd is 56.3. The radius of curvature R of surface 471b is 13.7650, and the on-axis surface distance T between surface 471b and surface 472a is 0.050.

[0146] The radii of curvature R and on-axis surface spacing T of the surfaces 472a to 478a and 472b to 478b, as well as the refractive index Nd and Abbe number vd of the lenses 472 to 478, are shown in the table of FIG.

[0147] Because the surfaces 414a and 414b are flat, the radii of curvature R of the surfaces 414a and 414b are infinite. The on-axis surface spacing T between the surfaces 414a and 414b, as well as the refractive index Nd and Abbe number vd of the infrared cut filter 414, are shown in the table of Fig. 22. The radius of curvature R of the imaging surface 433a is -150.0000.

[0148] <Example of Aspherical Data for Each Lens Surface> FIG. 23 is a table showing an example of aspherical data for the surfaces 471a to 478a and 471b to 478b.

[0149] 23 lists the aspherical data for each of the surfaces 471a to 478a and 471b to 478b, including the conical coefficient K and the ith aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20).

[0150] 23, the conic coefficient K of the surface 471a is 0.0732. The fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A10, and the twelfth-order aspherical coefficient A12 are 1.43408×10 －４, -5.97619×10 －５ , 6.36360×10 －５ , -3.80520×10 －５ , 1.57549×10 －５ The 14th-order aspherical coefficient A14, the 16th-order aspherical coefficient A16, the 18th-order aspherical coefficient A18, and the 20th-order aspherical coefficient A20 are −3.96727×10 －６ , 5.81098×10 －７ , -4.53947×10 －８ , 1.45122×10 －９ is.

[0151] The aspherical data of the surfaces 472a to 478a and the surfaces 471b to 478b are the values ​​shown in the table of FIG.

[0152] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 24 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 416. In FIG.

[0153] Fig. 24A is a graph showing spherical aberration for light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 416. Fig. 24B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 416. Fig. 24C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 416.

[0154] <Example of Transverse Aberration> FIG. 25 is a transverse aberration diagram showing an example of transverse aberration occurring in the imaging lens 416. In FIG.

[0155] FIG. 25 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 416 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0156] Specifically, the graphs on the left of A to E in Fig. 25 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 25 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0157] As shown in FIGS. 24 and 25, the imaging lens 416 has good aberration correction and has good imaging quality.

[0158] In the imaging lens 416, as long as at least one of the surfaces 471a and 471b is aspherical, both surfaces do not have to be aspherical.

[0159] 5. Fifth Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A fifth embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0160] FIG. 26 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface to which the present technology is applied according to a fifth embodiment.

[0161] The infrared cut filter 514 of FIG. 26 differs from the infrared cut filter 114 in that it has surfaces 514a and 514b instead of surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0162] The imaging lens 516 in FIG. 26 is composed of a lens group 561 and an aperture stop 562 .

[0163] Lens group 561 is composed of eight aspherical lenses 571 to 578. The eight lenses 571 to 578 are arranged in order from the object side (left side in FIG. 26) toward the imaging surface 533a side (right side in FIG. 26). Lens 571 (first lens) closest to the object side of lens group 561 has a surface 571a facing the object side and a surface 571b facing the imaging surface 533a side. Similarly, lenses 572 to 578 each have surfaces 572a and 572b, surfaces 573a and 573b, surfaces 574a and 574b, surfaces 575a and 575b, surfaces 576a and 576b, surfaces 577a and 577b, and surfaces 578a and 578b, respectively. Surfaces 571a to 578a and 571b to 578b are aspherical.

[0164] Lens 571 has a meniscus shape with its convex surface facing the object side. The peripheral portion of surface 572b of lens 572 (second lens) which is the second lens from the object side in lens group 561 has a shape that tilts toward the imaging surface 533a. Lens 571 has positive refractive power, and lens 578 (final lens) which is the lens in lens group 561 closest to the imaging surface 533a has negative refractive power. Surface 577a of lens 577 (final lens) which is the second lens from the imaging surface 533a in lens group 561 and surface 578a of lens 578 have extrema.

[0165] The aperture stop 562 is disposed between the surfaces 571 a and 571 b and limits the light incident on the lens 571 .

[0166] Light incident on the imaging lens 516 from an object is emitted via the lenses 571 to 578 and the infrared cut filter 514, and is collected on the imaging surface 533a.

[0167] In the following, point A on the optical axis of surface 578b ５ and point B on the optical axis of the imaging surface 533a ５ Line segment A connecting ５ B ５ That is, the distance on the optical axis between the surface 578b and the imaging surface 533a is BF0 ５ The most convex point C of the surface 578b is called ５ and point C ５ Intersection D between a line parallel to the optical axis passing through the imaging surface 533a ５ Line segment C connecting ５ D５ The distance between the two points is ５ The distance in the optical axis direction between the image pickup surface 533a and BFC ５ Distance BF0 ５ and BFC ５ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of optical members such as the infrared cut filter 514 is calculated in terms of air equivalent distance.

[0168] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 27 is a table showing examples of various setting values ​​for the entire imaging lens 516. In FIG.

[0169] As shown in FIG. 27, the focal length f ５ The maximum angle of view of the imaging lens 516 is 2ω. ５ The F-number Fno of the imaging lens 516 is 78.3 degrees. ５ is 1.77. The diagonal length 2Y of the imaging surface 533a ５ The distance L on the optical axis from the surface 571a to the image-side focal point of the imaging lens 516 is 16.384 mm. ５ is 10.69 mm. Distance L ５ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of optical members such as the infrared cut filter 514 is calculated in terms of air equivalent distance.

[0170] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 28 is a table showing examples of various setting values ​​for aperture stop 562, lenses 571 to 578, infrared cut filter 514, and an image sensor having image sensing surface 533a.

[0171] 28 lists the components of imaging lens 516 including the surface of aperture stop 562, surfaces 571a to 578a, 571b to 578b, 514a, and 514b, and imaging surface 533a, and the setting values ​​of the surface. The setting value items are the same as those in FIG. 6.

[0172] Because the surface of the aperture stop 562 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 28. The on-axis surface spacing T of the surface of the aperture stop 562, which is the distance on the optical axis from the aperture stop 562 to the surface 571a, is -1.200. As shown in Fig. 26, because the surface 571a is located closer to the object side than the aperture stop 562, the on-axis surface spacing T has a negative value.

[0173] The radius of curvature R of surface 571a is 3.6725, and the on-axis surface distance T from surface 571b is 1.436. The refractive index Nd of the material of lens 571 having surface 571a is 1.5449, and the Abbe number vd is 56.3. The radius of curvature R of surface 571b is 15.9709, and the on-axis surface distance T from surface 572a is 0.156.

[0174] The radii of curvature R and on-axis surface spacing T of the surfaces 572a to 578a and 572b to 578b, as well as the refractive index Nd and Abbe number vd of the lenses 572 to 578, are shown in the table of FIG.

[0175] Because the surfaces 514a and 514b are flat, the radii of curvature R of the surfaces 514a and 514b are infinite. The on-axis surface spacing T between the surfaces 514a and 514b, as well as the refractive index Nd and Abbe number vd of the infrared cut filter 514, are shown in the table of Fig. 28. The radius of curvature R of the imaging surface 533a is -150.0000.

[0176] <Example of Aspherical Data for Each Lens Surface> FIG. 29 is a table showing an example of aspherical data for the surfaces 571a to 578a and 571b to 578b.

[0177] 29 lists aspherical data for each of the surfaces 571a to 578a and 571b to 578b, including a conical coefficient K and an ith aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20).

[0178] 29, the conic coefficient K of the surface 571a is −0.4730. The fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, the tenth-order aspherical coefficient A10, and the twelfth-order aspherical coefficient A12 are 1.76769×10 －３, -4.17147×10 －４ , 3.67244×10 －４ , -1.49068×10 －４ , 3.69682×10 －５ The 14th-order aspherical coefficient A14, the 16th-order aspherical coefficient A16, the 18th-order aspherical coefficient A18, and the 20th-order aspherical coefficient A20 are −5.38115×10 －６ , 4.23936×10 －７ , -1.41944×10 －８ , 4.75376×10 －１２ is.

[0179] The aspherical data of the surfaces 572a to 578a and the surfaces 571b to 578b are the values ​​shown in the table of FIG.

[0180] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 30 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 516. In FIG.

[0181] Fig. 30A is a graph showing spherical aberration for light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 516. Fig. 30B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 516. Fig. 30C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 516.

[0182] <Example of Lateral Aberration> FIG. 31 is a diagram showing an example of lateral aberration occurring in the imaging lens 516. In FIG.

[0183] FIG. 31 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 516 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0184] Specifically, the graphs on the left of A to E in Fig. 31 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 31 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0185] As shown in FIGS. 30 and 31, the imaging lens 516 has good aberration correction and has good imaging quality.

[0186] In the imaging lens 516, as long as at least one of the surfaces 571a and 571b is aspherical, both surfaces do not have to be aspherical.

[0187] 6. Sixth Embodiment Example of Configuration of Imaging Lens, Infrared Cut Filter, and Imaging Surface In a sixth embodiment of an imaging device having an imaging lens to which the present technology is applied, the imaging lens, the infrared cut filter, and the imaging surface are different from those of the imaging device 100 in Fig. 2, but the rest of the imaging device is configured in the same way as the imaging device 100. Therefore, the following description will focus on the imaging lens, the infrared cut filter, and the imaging surface.

[0188] FIG. 32 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a sixth embodiment to which the present technology is applied.

[0189] The infrared cut filter 614 of FIG. 32 differs from the infrared cut filter 114 in that it has surfaces 614a and 614b instead of surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0190] The imaging lens 616 in FIG. 32 is composed of a lens group 661 and an aperture stop 662 .

[0191] Lens group 661 is composed of eight aspherical lenses 671 to 678. The eight lenses 671 to 678 are arranged in order from the object side (left side in FIG. 32) toward the imaging surface 633a side (right side in FIG. 32). Lens 671 (first lens) closest to the object side of lens group 661 has a surface 671a facing the object side and a surface 671b facing the imaging surface 633a side. Similarly, lenses 672 to 678 have surfaces 672a and 672b, surfaces 673a and 673b, surfaces 674a and 674b, surfaces 675a ​​and 675b, surfaces 676a and 676b, surfaces 677a and 677b, and surfaces 678a and 678b, respectively. Surfaces 671a to 678a and 671b to 678b are aspherical.

[0192] The lens 671 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 672b of the second lens 672 (second lens) from the object side of the lens group 661 has a shape that tilts toward the imaging surface 633a. The lens 671 has positive refractive power, and the lens 678 (final lens) of the lens group 661 that is closest to the imaging surface 633a has negative refractive power. A surface 677a of the second lens 677 (final front lens) from the imaging surface 633a of the lens group 661 and a surface 678a of the lens 678 have extrema.

[0193] Aperture stop 662 is disposed between surface 673 b and surface 674 a and limits the light incident on lens 674 .

[0194] Light incident on the imaging lens 616 from an object is emitted via the lenses 671 to 678 and the infrared cut filter 614, and is collected on the imaging surface 633a.

[0195] In the following, point A on the optical axis of surface 678b ６ and point B on the optical axis of the imaging surface 633a ６ Line segment A connecting ６ B ６ The distance between the surface 678b and the imaging surface 633a on the optical axis is BF0 ６ The most convex point C of the surface 678b is called ６ and point C ６ Intersection point D between a line parallel to the optical axis passing through the imaging surface 633a ６ Line segment C connecting ６ D６ The distance between the two points is ６ The distance in the optical axis direction between the image pickup surface 633a and BFC ６ Distance BF0 ６ and BFC ６ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 614 is calculated in terms of the air equivalent distance.

[0196] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 33 is a table showing examples of various setting values ​​for the entire imaging lens 616. In FIG.

[0197] As shown in FIG. 33, the focal length f ６ The maximum angle of view of the imaging lens 616 is 2ω. ６ The F-number Fno of the imaging lens 616 is 86.5 degrees. ６ is 1.77. The diagonal length 2Y of the imaging surface 633a ６ The distance L on the optical axis from the surface 671a to the image-side focal point of the imaging lens 616 is 16.384 mm. ６ is 9.66 mm. Distance L ６ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 614 is calculated in terms of the air equivalent distance.

[0198] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 34 is a table showing examples of various setting values ​​for the aperture stop 662, lenses 671 to 678, infrared cut filter 614, and image sensor having the image sensor surface 633a.

[0199] The table in Fig. 34 lists the components of imaging lens 616 that include surfaces 671a to 673a and 671b to 678b and the surface of aperture stop 662, as well as the setting values ​​for those surfaces. The table in Fig. 34 lists the components of imaging lens 616 that include surfaces 674a to 678a, 674b to 678b, 614a, and 614b, as well as imaging surface 633a, as well as the setting values ​​for those surfaces. The setting value items are the same as those in Fig. 6.

[0200] The radius of curvature R of surface 671a is 3.5805, and the on-axis surface distance T between surface 671a and surface 671b is 0.733. The refractive index Nd of the material of lens 671 having surface 671a is 1.4971, and the Abbe number vd is 81.6. The radius of curvature R of surface 671b is 6.6229, and the on-axis surface distance T between surface 671b and surface 672a is 0.179.

[0201] The radii of curvature R and axial surface spacing T of surfaces 672a to 678a and 672b to 678b, as well as the refractive index Nd and Abbe number vd of lenses 672 to 678, are shown in the table of Fig. 34. The axial surface spacing T of surface 673b is the distance on the optical axis between surface 673b and the surface of aperture stop 662.

[0202] Because the surface of the aperture stop 662 and the surfaces 614a and 614b are flat, the radius of curvature R of the surface of the aperture stop 662 and the surfaces 614a and 614b is infinite. The axial surface spacing T of the surfaces of the aperture stop 662, which is the distance on the optical axis from the aperture stop 662 to the surface 674a, is 0.167. The axial surface spacing T of the surfaces 614a and 614b, the refractive index Nd of the infrared cut filter 614, and the Abbe number vd are the values ​​shown in the table of FIG. 34 . The radius of curvature R of the imaging surface 633a is −150.0000.

[0203] <Example of Aspherical Data for Each Lens Surface> FIG. 35 is a table showing an example of aspherical data for the surfaces 671a to 678a and 671b to 678b.

[0204] The table in Figure 35 lists the aspherical data for each of the surfaces 671a to 678a and 671b to 678b, including the conical coefficient K and the third-order aspherical coefficient A3 to the thirtieth-order aspherical coefficient A30.

[0205] 35, the conic coefficient K of the surface 671a is -1.0152. The third-order aspherical coefficient A3, fifth-order aspherical coefficient A5, seventh-order aspherical coefficient A7, ninth-order aspherical coefficient A9, eleventh-order aspherical coefficient A11, thirteenth-order aspherical coefficient A13, fifteenth-order aspherical coefficient A15, and seventeenth-order aspherical coefficients A17 to thirtieth-order aspherical coefficients A30 of the surface 671a are all 0. The fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, and tenth-order aspherical coefficient A10 of the surface 671a are each 2.67441×10 －３ , 1.54653×10 －４ , -1.53922×10 －４ , 4.03748×10 －５ The 12th-order aspherical coefficient A12, the 14th-order aspherical coefficient A14, and the 16th-order aspherical coefficient A16 are respectively −3.72889×10 －６ , -2.59970×10 －７ , 3.04625×10 －８ is.

[0206] The aspherical data of the surfaces 672a to 678a and the surfaces 671b to 678b are the values ​​shown in the table of FIG.

[0207] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 36 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 616. In FIG.

[0208] Fig. 36A is a graph showing spherical aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 616. Fig. 36B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 616. Fig. 36C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 616.

[0209] <Example of Lateral Aberration> FIG. 37 is a diagram showing an example of lateral aberration occurring in the imaging lens 616. In FIG.

[0210] FIG. 37 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 616 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0211] Specifically, the graphs on the left of A to E in Fig. 37 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 37 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0212] As shown in FIGS. 36 and 37, the imaging lens 616 has good aberration correction and has good imaging quality.

[0213] In the imaging lens 616, as long as at least one of the surfaces 671a and 671b is aspherical, both surfaces do not have to be aspherical.

[0214] 7. Seventh Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A seventh embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0215] FIG. 38 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a seventh embodiment to which the present technology is applied.

[0216] The infrared cut filter 714 of FIG. 38 differs from the infrared cut filter 114 in that it has surfaces 714a and 714b instead of surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0217] The imaging lens 716 in FIG. 38 is composed of a lens group 761 and an aperture stop 762 .

[0218] Lens group 761 is composed of seven aspherical lenses, lenses 771 to 777. The seven lenses 771 to 777 are arranged in order from the object side (left side in FIG. 38) toward the imaging surface 733a side (right side in FIG. 38). Lens 771 (first lens), which is closest to the object side of lens group 761, has a surface 771a facing the object side and a surface 771b facing the imaging surface 733a side. Similarly, lenses 772 to 777 have surfaces 772a and 772b, surfaces 773a and 773b, surfaces 774a and 774b, surfaces 775a and 775b, surfaces 776a and 776b, and surfaces 777a and 777b, respectively. Surfaces 771a to 777a and 771b to 777b are aspherical.

[0219] Lens 771 has a meniscus shape with its convex surface facing the object side. The peripheral portion of surface 772b of lens 772 (second lens) which is the second lens from the object side in lens group 761 has a shape that tilts toward the imaging surface 733a. Lens 771 has positive refractive power, and lens 777 (final lens) which is the lens closest to the imaging surface 733a in lens group 761 has negative refractive power. Surface 776a of lens 776 (final lens) which is the second lens from the imaging surface 733a in lens group 761 and surface 777a of lens 777 have extrema.

[0220] The aperture stop 762 is disposed between the surfaces 771 a and 771 b and limits the light incident on the lens 771 .

[0221] Light incident on the imaging lens 716 from an object is emitted via lenses 771 to 777 and the infrared cut filter 714, and is collected on the imaging surface 733a.

[0222] In the following, point A on the optical axis of the surface 777b ７ and point B on the optical axis of the imaging surface 733a ７ Line segment A connecting ７ B ７ The distance between the surface 777b and the imaging surface 733a on the optical axis is BF0 ７ The most convex point C of the surface 777b ７ and point C ７ Intersection D between a line parallel to the optical axis passing through the imaging surface 733a ７ Line segment C connecting ７ D ７The distance between the two points is ７ and the distance in the optical axis direction of the imaging surface 733a is BFC ７ Distance BF0 ７ and BFC ７ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 714 is calculated in terms of the air equivalent distance.

[0223] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 39 is a table showing examples of various setting values ​​for the entire imaging lens 716. In FIG.

[0224] As shown in FIG. 39, the focal length f ７ The maximum angle of view of the imaging lens 716 is 2ω. ７ is 92.8 degrees. ７ is 1.95. The diagonal length 2Y of the imaging surface 733a ７ The distance L on the optical axis from the surface 771a to the image-side focal point of the imaging lens 716 is 16.384 mm. ７ The distance L is 8.87 mm. ７ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 714 is calculated in terms of the air equivalent distance.

[0225] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 40 is a table showing examples of various setting values ​​for aperture stop 762, lenses 771 to 777, infrared cut filter 714, and an image sensor having image sensing surface 733a.

[0226] The table in Fig. 40 lists the components of imaging lens 716 including each surface, and the setting values ​​of each surface, for each surface of aperture stop 762, surfaces 771a to 777a, 771b to 777b, 714a, and 714b, and imaging surface 733a. The setting value items are the same as those in Fig. 6.

[0227] Because the surface of the aperture stop 762 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 40. The on-axis surface spacing T of the aperture stop 762, which is the distance on the optical axis from the aperture stop 762 to the surface 771a, is -0.770. As shown in Fig. 38, because the surface 771a is located closer to the object side than the aperture stop 762, the on-axis surface spacing T has a negative value.

[0228] The radius of curvature R of surface 771a is 2.8751, and the on-axis surface distance T between surface 771a and surface 771b is 0.926. The refractive index Nd of the material of lens 771 having surface 771a is 1.4971, and the Abbe number vd is 81.6. The radius of curvature R of surface 771b is 7.5346, and the on-axis surface distance T between surface 771a and surface 772a is 0.336.

[0229] The radii of curvature R and on-axis surface spacing T of the surfaces 772a to 777a and 772b to 777b, as well as the refractive index Nd and Abbe number vd of the lenses 772 to 777, are shown in the table of FIG.

[0230] Because the surfaces 714a and 714b are flat, the radii of curvature R of the surfaces 714a and 714b are infinite. The on-axis surface spacing T between the surfaces 714a and 714b, as well as the refractive index Nd and Abbe number vd of the infrared cut filter 714, are shown in the table of Fig. 40. The radius of curvature R of the imaging surface 733a is -150.0000.

[0231] <Example of Aspherical Data for Each Lens Surface> FIG. 41 is a table showing an example of aspherical data for the surfaces 771a to 777a and 771b to 777b.

[0232] 41 lists the aspherical data for each of the surfaces 771a to 777a and 771b to 777b. This aspherical data includes a conic coefficient K and an ith aspherical coefficient Ai (i=4, 6, 8, 10, 12, 14, 16, 18, 20).

[0233] 41, the conic coefficient K of the surface 771a is −0.2404. The fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, tenth-order aspherical coefficient A10, and twelfth-order aspherical coefficient A12 of the surface 771a are 1.37811×10 －３, 2.00633×10 －３ , -1.85586×10 －３ , 1.25169×10 －３ , -4.45500×10 －４ The 14th-order aspherical coefficient A14 and the 16th-order aspherical coefficient A16 of the surface 771a are 8.26499×10 －５ , -6.06914×10 －６ The 18th-order aspherical coefficient A18 and the 20th-order aspherical coefficient A20 of the surface 771a are both zero.

[0234] The aspherical data of the surfaces 772a to 777a and the surfaces 771b to 777b are the values ​​shown in the table of FIG.

[0235] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 42 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 716. In FIG.

[0236] Fig. 42A is a graph showing spherical aberration for light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 716. Fig. 42B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 716. Fig. 42C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 716.

[0237] <Example of Lateral Aberration> FIG. 43 is a diagram showing an example of lateral aberration occurring in the imaging lens 716. In FIG.

[0238] FIG. 43 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 716 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0239] Specifically, the left graphs of A to E in Fig. 43 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the right graphs of A to E in Fig. 43 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0240] As shown in FIGS. 42 and 43, the imaging lens 716 has good aberration correction and has good imaging quality.

[0241] In the imaging lens 716, as long as at least one of the surfaces 771a and 771b is aspherical, both surfaces do not have to be aspherical.

[0242] 8. Eighth Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface An eighth embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0243] FIG. 44 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to an eighth embodiment to which the present technology is applied.

[0244] The infrared cut filter 814 of FIG. 44 differs from the infrared cut filter 114 in that it has surfaces 814a and 814b instead of surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0245] The imaging lens 816 in FIG. 44 is composed of a lens group 861 and an aperture stop 862 .

[0246] Lens group 861 is composed of six aspherical lenses 871 to 876. The six lenses 871 to 876 are arranged in order from the object side (left side in FIG. 44) toward the imaging surface 833a side (right side in FIG. 44). Lens 871 (first lens) closest to the object side of lens group 861 has a surface 871a facing the object side and a surface 871b facing the imaging surface 833a side. Similarly, lenses 872 to 876 have surfaces 872a and 872b, surfaces 873a and 873b, surfaces 874a and 874b, surfaces 875a and 875b, and surfaces 876a and 876b, respectively. Surfaces 871a to 876a and 871b to 876b are aspherical.

[0247] Lens 871 has a meniscus shape with its convex surface facing the object side. The peripheral portion of surface 872b of lens 872 (second lens) which is the second lens from the object side in lens group 861 has a shape that tilts toward the imaging surface 833a. Lens 871 has positive refractive power, and lens 876 (final lens) which is the lens closest to the imaging surface 833a in lens group 861 has negative refractive power. Surface 875a of lens 875 (final front lens) which is the second lens from the imaging surface 833a in lens group 861 and surface 876a of lens 876 have extrema.

[0248] The aperture stop 862 is disposed between the surfaces 871 a and 871 b and limits the light incident on the lens 871 .

[0249] Light incident on the imaging lens 816 from an object is emitted via the lenses 871 to 876 and the infrared cut filter 814, and is collected on the imaging surface 833a.

[0250] In the following, point A on the optical axis of surface 876b ８ and point B on the optical axis of the imaging surface 833a ８ Line segment A connecting ８ B ８ The distance between the surface 876b and the imaging surface 833a on the optical axis is BF0 ８ The most convex point C of the surface 876b is called ８ and point C ８ Intersection D between a line parallel to the optical axis passing through the imaging surface 833a ８ Line segment C connecting ８ D ８ The distance between the two points is ８ and the distance in the optical axis direction of the imaging surface 833a is BFC ８ Distance BF0 ８ and BFC ８ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 814 is calculated in terms of the air equivalent distance.

[0251] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 45 is a table showing examples of various setting values ​​for the entire imaging lens 816. In FIG.

[0252] As shown in FIG. 45, the focal length f８ The maximum angle of view of the imaging lens 816 is 2ω. ８ is 90.2 degrees. ８ is 1.85. The diagonal length 2Y of the imaging surface 833a ８ The distance L on the optical axis from the surface 871a to the image-side focal point of the imaging lens 816 is 8.000 mm. ８ is 5.53 mm. Distance L ８ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 814 is calculated in terms of the air equivalent distance.

[0253] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 46 is a table showing examples of various setting values ​​for aperture stop 862, lenses 871 to 876, infrared cut filter 814, and an image sensor having image sensor surface 833a.

[0254] The table in Fig. 46 lists the components of imaging lens 816 including each surface, such as the surface of aperture stop 862, surfaces 871a to 876a, 871b to 876b, 814a, and 814b, and imaging surface 833a, as well as the setting values ​​of each surface. The setting value items are the same as those in Fig. 6.

[0255] Because the surface of the aperture stop 862 is flat, the radius of curvature R of that surface is infinite, as shown in Fig. 46. The on-axis surface spacing T of the surface of the aperture stop 862, which is the distance on the optical axis from the aperture stop 862 to the surface 871a, is -0.178. As shown in Fig. 44, because the surface 871a is located closer to the object side than the aperture stop 862, the on-axis surface spacing T has a negative value.

[0256] The radius of curvature R of surface 871a is 2.5792, and the on-axis surface distance T from surface 871b is 0.510. The refractive index Nd of the material of lens 871 having surface 871a is 1.6935, and the Abbe number vd is 53.2. The radius of curvature R of surface 871b is 55.9326, and the on-axis surface distance T from surface 872a is 0.050.

[0257] The radii of curvature R and on-axis surface spacing T of the surfaces 872a to 876a and 872b to 876b, as well as the refractive index Nd and Abbe number vd of the lenses 872 to 876, are shown in the table of FIG.

[0258] Because surfaces 814a and 814b are flat, the radii of curvature R of surfaces 814a and 814b are infinite. The on-axis surface spacing T between surfaces 814a and 814b, as well as the refractive index Nd and Abbe number vd of infrared cut filter 814, are shown in the table of Fig. 46. The radius of curvature R of imaging surface 833a is -25.6019.

[0259] <Example of Aspherical Data for Each Lens Surface> FIG. 47 is a table showing an example of aspherical data for surfaces 871a to 876a and 871b to 876b.

[0260] 47 lists the aspherical data for each of the surfaces 871a to 876a and 871b to 876b, including the conical coefficient K and the third-order aspherical coefficient A3 to the fourteenth-order aspherical coefficient A14.

[0261] 47, the conic coefficient K of the surface 871a is −0.7869. The i-th order aspherical coefficients Ai (i=3, 5, 7, 9, 11, 13) of the surface 871a are all 0. The fourth order aspherical coefficient A4, sixth order aspherical coefficient A6, and eighth order aspherical coefficient A8 of the surface 871a are −6.32821×10 －３ , -5.48894×10 －３ , -6.16637×10 －３ The 10th-order aspherical coefficient A10, the 12th-order aspherical coefficient A12, and the 14th-order aspherical coefficient A14 of the surface 871a are respectively 4.93139×10 －４ , 1.49466×10 －３ , -9.58835×10 －４ is.

[0262] The aspherical data of the surfaces 872a to 876a and the surfaces 871b to 876b are the values ​​shown in the table of FIG.

[0263] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 48 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 816. In FIG.

[0264] Fig. 48A is a graph showing spherical aberration for light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 816. Fig. 48B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 816. Fig. 48C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 816.

[0265] <Example of Transverse Aberration> FIG. 49 is a transverse aberration diagram showing an example of transverse aberration occurring in the imaging lens 816. In FIG.

[0266] FIG. 49 is a graph showing the lateral aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 816.

[0267] Specifically, the graphs on the left of A to E in Fig. 49 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively, and the graphs on the right of A to E in Fig. 49 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0268] As shown in FIGS. 48 and 49, the imaging lens 816 has good aberration correction and has good imaging quality.

[0269] In the imaging lens 816, as long as at least one of the surfaces 871a and 871b is aspherical, both surfaces do not have to be aspherical.

[0270] 9. Ninth Embodiment Configuration Example of Imaging Lens, Infrared Cut Filter, and Imaging Surface A ninth embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0271] FIG. 50 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a ninth embodiment to which the present technology is applied.

[0272] The infrared cut filter 914 of FIG. 50 differs from the infrared cut filter 114 in that it has surfaces 914a and 914b instead of surfaces 114a and 114b, but is otherwise configured in the same manner as the infrared cut filter 114.

[0273] The imaging lens 916 in FIG. 50 is composed of a lens group 961 and an aperture stop 962 .

[0274] The lens group 961 is composed of eight aspherical lenses 971 to 978. The eight lenses 971 to 978 are arranged in order from the object side (left side in FIG. 50) toward the imaging surface 933a side (right side in FIG. 50). The lens 971 (first lens) closest to the object side of the lens group 961 has a surface 971a facing the object side and a surface 971b facing the imaging surface 933a side. Similarly, the lenses 972 to 978 each have surfaces 972a and 972b, surfaces 973a and 973b, surfaces 974a and 974b, surfaces 975a and 975b, surfaces 976a and 976b, surfaces 977a and 977b, and surfaces 978a and 978b, respectively. Surfaces 971a to 978a and 971b to 978b are aspherical.

[0275] The lens 971 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 972b of the second lens 972 (second lens) from the object side of the lens group 961 has a shape that tilts toward the imaging surface 933a. The lens 971 has positive refractive power, and the lens 978 (final lens) of the lens group 961 that is closest to the imaging surface 933a has negative refractive power. The surface 977a of the second lens 977 (final front lens) from the imaging surface 933a of the lens group 961 and the surface 978a of the lens 978 have extreme values.

[0276] Aperture stop 962 is disposed between surface 973 b and surface 974 a and limits the light incident on lens 974 .

[0277] Light incident on the imaging lens 916 from an object is emitted via lenses 971 to 978 and an infrared cut filter 914, and is collected on the imaging surface 933a.

[0278] In the following, point A on the optical axis of the surface 976b ９ and point B on the optical axis of the imaging surface 933a ９ Line segment A connecting ９ B ９ That is, the distance between the surface 976b and the imaging surface 933a on the optical axis is BF0 ９ The most convex point C of the surface 976b ９ and point C ９ Intersection point D between a line parallel to the optical axis passing through the imaging surface 933a ９ Line segment C connecting ９ D ９ The distance between the two points is ９ and the distance in the optical axis direction of the imaging surface 933a is BFC ９ In the example of FIG. 50, the most convex part of the surface 976b is on the optical axis, so point A ９ and point C ９ , and point B ９ and point D ９ are the same. Therefore, the distance BF0 ９ and BFC ９ are the same. Distance BF0 ９ and BFC ９ In the calculation of distance BF0 １ and BFC １Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 914 is calculated in terms of the air equivalent distance.

[0279] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 51 is a table showing examples of various setting values ​​for the entire imaging lens 916. In FIG.

[0280] As shown in FIG. 51, the focal length f ９ The maximum angle of view of the imaging lens 916 is 2ω. ９ The F-number Fno of the imaging lens 916 is 80.5 degrees. ９ is 1.77. The diagonal length 2Y of the imaging surface 933a ９ The distance L on the optical axis from the surface 971a to the image-side focal point of the imaging lens 916 is 16.384 mm. ９ is 10.37 mm. Distance L ９ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of the optical members such as the infrared cut filter 914 is calculated in terms of the air equivalent distance.

[0281] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 52 is a table showing examples of various setting values ​​for the aperture stop 962, lenses 971 to 978, infrared cut filter 914, and image sensor having the image sensor surface 933a.

[0282] The table in Fig. 52 lists the components of imaging lens 916 that include surfaces 971a-973a and 971b-973b and the surface of aperture stop 962, as well as the setting values ​​for those surfaces. The table in Fig. 52 lists the components of imaging lens 916 that include surfaces 974a-978a, 974b-978b, 914a, and 914b, as well as imaging surface 933a, as well as the setting values ​​for those surfaces. The setting value items are the same as those in Fig. 6.

[0283] The radius of curvature R of surface 971a is 3.5749, and the on-axis surface distance T between surface 971a and surface 971b is 1.166. The refractive index Nd of the material of lens 971 having surface 971a is 1.4971, and the Abbe number vd is 81.6. The radius of curvature R of surface 971b is 7.9938, and the on-axis surface distance T between surface 971a and surface 972a is 0.223.

[0284] The radii of curvature R and axial surface spacing T of surfaces 972a to 978a and 972b to 978b, as well as the refractive index Nd and Abbe number vd of lenses 972 to 978, are shown in the table of Fig. 52. The axial surface spacing T of surface 973b is the distance on the optical axis between surface 973b and the surface of aperture stop 962.

[0285] Because the surface of the aperture stop 962 and surfaces 914a and 914b are flat, the radius of curvature R of the surface of the aperture stop 962 and surfaces 914a and 914b is infinite. The on-axis surface spacing T of the surfaces of the aperture stop 962, which is the distance on the optical axis from the aperture stop 962 to surface 974a, is 0.083. The on-axis surface spacing T of surfaces 914a and 914b, the refractive index Nd and Abbe number vd of the infrared cut filter 914, respectively, are shown in the table of FIG. 52. The radius of curvature R of the imaging surface 933a is -100.0000.

[0286] <Example of Aspherical Data for Each Lens Surface> FIG. 53 is a table showing an example of aspherical data for the surfaces 971a to 978a and 971b to 978b.

[0287] The table in Figure 53 lists the aspherical data for each of the surfaces 971a to 978a and 971b to 978b, including the conical coefficient K and the third-order aspherical coefficient A3 to the thirtieth-order aspherical coefficient A30.

[0288] 53, the conic coefficient K of the surface 971a is −0.5896. The i-th order aspherical coefficients Ai (i=3, 5, 7, 9, 11, 13, 15, 17 to 30) of the surface 971a are all 0. The fourth order aspherical coefficient A4, sixth order aspherical coefficient A6, and eighth order aspherical coefficient A8 of the surface 971a are 1.44834×10 －３ , 1.44914×10 －４ , -2.72888×10 －５The 10th-order aspherical coefficient A10, the 12th-order aspherical coefficient A12, the 14th-order aspherical coefficient A14, and the 16th-order aspherical coefficient A16 of the surface 971a are respectively 3.16115×10 －６ , 1.42043×10 －７ , -5.88011×10 －８ , 5.13129×10 －１０ is.

[0289] The aspherical data of the surfaces 972a to 978a and the surfaces 971b to 978b are the values ​​shown in the table of FIG.

[0290] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 54 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 916. In FIG.

[0291] Fig. 54A is a graph showing spherical aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 916. Fig. 54B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 916. Fig. 54C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 916.

[0292] <Example of Lateral Aberration> FIG. 55 is a diagram showing an example of lateral aberration occurring in the imaging lens 916. In FIG.

[0293] FIG. 55 is a graph showing the lateral aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 916.

[0294] Specifically, the graphs on the left of A to E in Fig. 55 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively. The graphs on the right of A to E in Fig. 55 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0295] As shown in FIGS. 54 and 55, the imaging lens 916 has good aberration correction and has good imaging quality.

[0296] In the imaging lens 916, as long as at least one of the surfaces 971a and 971b is aspherical, both surfaces do not have to be aspherical.

[0297] 10. Tenth embodiment Configuration example of imaging lens, infrared cut filter, and imaging surface A tenth embodiment of an imaging device having an imaging lens to which the present technology is applied differs from the imaging device 100 in Fig. 2 in the imaging lens, infrared cut filter, and imaging surface, but is otherwise configured in the same manner as the imaging device 100. Therefore, the following description will focus on the imaging lens, infrared cut filter, and imaging surface.

[0298] FIG. 56 is a cross-sectional view showing a configuration example of an imaging lens, an infrared cut filter, and an imaging surface according to a tenth embodiment to which the present technology is applied.

[0299] 56 differs from the infrared cut filter 114 in that the infrared cut filter 1014 has curved surfaces 1014a and 1014b that are parallel to each other, instead of the surfaces 114a and 114b. Otherwise, the infrared cut filter 1014 is configured in the same manner as the infrared cut filter 114.

[0300] The imaging lens 1016 in FIG. 56 is composed of a lens group 1061 and an aperture stop 1062 .

[0301] Lens group 1061 is composed of eight aspherical lenses, lenses 1071 to 1078. The eight lenses 1071 to 1078 are arranged in order from the object side (left side in FIG. 56) toward the imaging surface 1033a side (right side in FIG. 56). Lens 1071 (first lens) closest to the object side of lens group 1061 has a surface 1071a on the object side and a surface 1071b on the imaging surface 1033a side. Similarly, lenses 1072 to 1075 have surfaces 1072a and 1072b, surfaces 1073a and 1073b, surfaces 1074a and 1074b, and surfaces 1075a and 1075b, respectively. Similarly, the lenses 1076 to 1078 have surfaces 1076a and 1076b, surfaces 1077a and 1077b, and surfaces 1078a and 1078b, respectively. The surfaces 1071a to 1078a and 1071b to 1078b are aspheric surfaces.

[0302] The lens 1071 has a meniscus shape with its convex surface facing the object side. The peripheral portion of a surface 1072b of the second lens 1072 (second lens) from the object side in the lens group 1061 has a shape that tilts toward the imaging surface 1033a. The lens 1071 has positive refractive power, and the lens 1078 (final lens) in the lens group 1061 that is closest to the imaging surface 1033a has negative refractive power. The surface 1077a of the second lens 1077 (final front lens) from the imaging surface 1033a in the lens group 1061 and the surface 1078a of the lens 1078 have extrema.

[0303] Aperture stop 1062 is disposed between surface 1074 b and surface 1075 a and limits the light incident on lens 1071 .

[0304] Light incident on the imaging lens 1016 from an object is emitted via the lenses 1071 to 1078 and the infrared cut filter 1014, and is collected on the imaging surface 1033a.

[0305] In the following, point A on the optical axis of the surface 1076b １０ and point B on the optical axis of the imaging surface 1033a １０ Line segment A connecting １０ B １０ The distance between the surface 1076b and the imaging surface 1033a on the optical axis is BF0 １０ The most convex point C of the surface 1076b is called１０ and point C １０ Intersection D between a line parallel to the optical axis passing through the imaging surface 1033a １０ Line segment C connecting １０ D １０ The distance between the two points is １０ and the distance in the optical axis direction of the imaging surface 1033a is BFC １０ Distance BF0 １０ and BFC １０ In the calculation of distance BF0 １ and BFC １ Similarly to the calculation of (1), the thickness of optical members such as the infrared cut filter 1014 is calculated in terms of air equivalent distance.

[0306] <Examples of Various Setting Values ​​for the Entire Imaging Lens> FIG. 57 is a table showing examples of various setting values ​​for the entire imaging lens 1016. In FIG.

[0307] As shown in FIG. 57, the focal length f １０ The maximum angle of view of the imaging lens 1016 is 2ω. １０ is 96.1 degrees. １０ is 1.77. The diagonal length 2Y of the imaging surface 1033a １０ The distance L on the optical axis from the surface 1071a to the image-side focal point of the imaging lens 1016 is 16.384 mm. １０ is 9.66 mm. Distance L １０ In the calculation of distance L １ Similarly to the calculation of (1), the thickness of optical members such as the infrared cut filter 1014 is calculated in terms of air equivalent distance.

[0308] <Examples of various setting values ​​for aperture stop, lenses, infrared cut filter, and image sensor> Figure 58 is a table showing examples of various setting values ​​for aperture stop 1062, lenses 1071 to 1078, infrared cut filter 1014, and an image sensor having image sensor surface 1033a.

[0309] The table in Fig. 58 lists the components of imaging lens 1016 that include surfaces 1071a to 1074a and 1071b to 1074b and the surface of aperture stop 1062, as well as the setting values ​​for those surfaces. The table in Fig. 58 lists the components of imaging lens 1016 that include surfaces 1074a to 1078a, 1074b to 1078b, 1014a, and 1014b, as well as imaging surface 1033a, as well as the setting values ​​for those surfaces. The setting value items are the same as those in Fig. 6.

[0310] The radius of curvature R of surface 1071a is 3.9546, and the on-axis surface distance T between surface 1071a and surface 1071b is 0.719. The refractive index Nd of the material of lens 1071 having surface 1071a is 1.4971, and the Abbe number vd is 81.6. The radius of curvature R of surface 1071b is 8.9245, and the on-axis surface distance T between surface 1071a and surface 1072a is 0.171.

[0311] The radii of curvature R and axial surface spacing T of surfaces 1072a to 1078a and 1072b to 1078b, as well as the refractive index Nd and Abbe number vd of lenses 1072 to 1078, are shown in the table of Fig. 58. The axial surface spacing T of surface 1074b is the distance on the optical axis between surface 1074b and the surface of aperture stop 1062.

[0312] Because the surface of the aperture stop 1062 is flat, the radius of curvature R of the surface of the aperture stop 1062 is infinite. The axial surface spacing T of the aperture stop 1062, which is the distance on the optical axis from the aperture stop 1062 to the surface 1075a, is 0.395. The radii of curvature R of the surfaces 1014a and 1014b and the imaging surface 1033a are -30.0000. Therefore, the surfaces 1014a and 1014b and the imaging surface 1033a are parallel to each other. This allows the space between the lens 1078 and the imaging surface 1033a to be used effectively. The refractive index Nd and Abbe number vd of the infrared cut filter 1014 are 1.5168 and 64.2, respectively.

[0313] <Example of Aspherical Data for Each Lens Surface> Fig. 59 is a table showing an example of aspherical data for surfaces 1071a to 1077a and 1071b to 1077b. Fig. 60 is a table showing an example of aspherical data for surfaces 1078a and 1078b.

[0314] The table in Fig. 59 lists aspherical data for each of the surfaces 1071a to 1077a and 1071b to 1077b. This aspherical data includes a conic coefficient K and an i-th aspherical coefficient Ai (i = 4, 6, 8, 10, 12, 14, 16, 18, 20).

[0315] 59, the conic coefficient K of the surface 1071a is −1.1299. The fourth-order aspherical coefficient A4, sixth-order aspherical coefficient A6, eighth-order aspherical coefficient A8, tenth-order aspherical coefficient A10, and twelfth-order aspherical coefficient A12 of the surface 1071a are 2.05181×10 －３ , 1.52415×10 －４ , -1.69610×10 －４ , 4.85408×10 －５ , -5.63517×10 －６ The 12th-order aspherical coefficient A12, the 14th-order aspherical coefficient A14, and the 16th-order aspherical coefficient A16 of the surface 1071a are respectively −5.63517×10 －６ , 2.21683×10 －８ , 1.54039×10 －８ The 18th-order aspherical coefficient A18 and the 20th-order aspherical coefficient A20 are both zero.

[0316] The aspherical data of the surfaces 1072a to 1077a and the surfaces 1071b to 1077b are the values ​​shown in the table of FIG.

[0317] 60 lists the aspherical data for each of the surfaces 1078a and 1078b, including the conical coefficient K and the third-order aspherical coefficient A3 to the twentieth-order aspherical coefficient A20.

[0318] 60, the conic coefficient K of the surface 1078a is 0.4490. The third-order aspherical coefficient A3 to the tenth-order aspherical coefficient A10 of the surface 1078a are respectively −2.48208×10 －３ , -8.39760×10 －２ , -3.07741×10 －４ , 2.50282×10 －２ , 1.50145×10－５ , -4.00963×10 －３ , 2.90400×10 －７ , 3.99429×10 －４ The 11th-order aspherical coefficient A11 to the 18th-order aspherical coefficient A18 of the surface 1078a are respectively 2.19492×10 －８ , -2.56299×10 －５ , -4.68511×10 －１０ , 1.06012×10 －６ , -8.00940×10 －１２ , -2.73608×10 －８ , -2.67255×10 －１３ , 4.01416×10 －１０ The 19th-order aspherical coefficient A19 and the 20th-order aspherical coefficient A20 of the surface 1078a are 5.72038×10 －１５ , -2.55861×10 －１２ is.

[0319] The aspherical data of the surface 1078b is the value shown in the table of FIG.

[0320] <Examples of Spherical Aberration, Field Curvature, and Distortion> FIG. 61 is a longitudinal aberration diagram showing examples of spherical aberration, field curvature, and distortion that occur in the imaging lens 1016. In FIG.

[0321] Fig. 61A is a graph showing spherical aberration for each wavelength of light having wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm that occurs in the imaging lens 1016. Fig. 61B is a graph showing field curvature for light having a wavelength of 587.5618 nm that occurs in the imaging lens 1016. Fig. 61C is a graph showing distortion aberration for light having a wavelength of 587.5618 nm that occurs in the imaging lens 1016.

[0322] <Example of Lateral Aberration> FIG. 62 is a diagram showing an example of lateral aberration occurring in the imaging lens 1016. In FIG.

[0323] FIG. 62 is a graph showing the lateral aberration for each wavelength of light, which occurs in the imaging lens 1016 and has wavelengths of 486.1327 nm, 587.5618 nm, and 656.2725 nm.

[0324] Specifically, the graphs on the left of A to E in Fig. 62 represent tangential lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively. The graphs on the right of A to E in Fig. 62 represent sagittal lateral aberration at 90%, 70%, 50%, 30% image height, and the center, respectively.

[0325] As shown in FIGS. 61 and 62, the imaging lens 1016 has good aberration correction and has good imaging quality.

[0326] In the imaging lens 1016, as long as at least one of the surfaces 1071a and 1071b is aspherical, both surfaces do not have to be aspherical.

[0327] As described above, the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a) is curved so as to tilt toward the object side. This provides the effects of correcting field curvature and mitigating (reducing) the chief ray incident angle (CRA (Chief Ray Angle)) on the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a). This allows for a reduction in the overall optical length (low profile) and a low F-number (large aperture) while ensuring sufficient image quality. As a result, high-quality image capture can be achieved with a low profile.

[0328] Therefore, by incorporating the imaging lens 116 (216, 316, 416, 516, 716, 816, 916, 1016), for example, a wide-angle camera, which is the most important factor in image quality of a smartphone, can be made smaller and prevented from protruding from the smartphone. In other words, the smartphone can be made flat.

[0329] On the other hand, when the imaging surface is flat, even if the number of lenses is six or more, the correction of various aberrations becomes insufficient as the height and diameter are reduced.

[0330] The number of lenses constituting the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, and 1016) is six or more. This makes it possible to realize a high-performance imaging lens with a small Fno, i.e., a bright lens, while supporting high pixel counts.

[0331] Lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) is a positive lens having positive refractive power. Therefore, lenses 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) to lens 177 (277, 377, 477, 577, 677, 776, 875, 977, 1077) can be a positive lens group including a positive lens. Lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) is a negative lens having negative refractive power.

[0332] As described above, the lens configuration of the imaging lenses 116 (216, 316, 416, 516, 616, 716, 816, 916, and 1016) can be considered a telephoto type lens configuration in which a positive lens and a negative lens are arranged in order from the object side. Therefore, the imaging lenses 116 (216, 316, 416, 516, 616, 716, 816, 916, and 1016) are suitable for compactness. Furthermore, the lens 171 (271, 371, 471, 571, 671, 771, 871, 971, and 1071) closest to the object side of the positive lens group is a positive lens, making it even more suitable for compactness.

[0333] At least one surface of the lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) is aspherical, so that aberrations can be corrected well.

[0334] The peripheral portions of the surfaces 172b (272b, 372b, 472b, 572b, 672b, 772b, 872b, 972b, 1072b) are shaped to tilt toward the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a). This allows peripheral light beams passing through the surfaces 172b (272b, 372b, 472b, 572b, 672b, 772b, 872b, 972b, 1072b) to have a diverging effect, thereby enabling good correction of chromatic aberration, field curvature, and distortion.

[0335] Since both surfaces of the lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) are aspherical, it is possible to suppress an increase in CRA that accompanies miniaturization. Suppressing an increase in CRA leads to suppressing shading, which is a darkening of the captured image at the periphery of the screen.

[0336] The lenses 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) have a meniscus shape. Therefore, the principal point of the entire imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016) can be positioned closer to the object side. As a result, the overall optical length can be shortened.

[0337] Since the surfaces 178b (278b, 378b, 478b, 578b, 678b, 777b, 876b, 978b, 1078b) have extrema, the CRA can be reduced. Since the surfaces 177b (277b, 377b, 477b, 577b, 677b, 776b, 875b, 977b, 1075b) have extrema, various aberrations such as curvature of field and distortion at the periphery of the image can be effectively corrected.

[0338] The aperture stops 162 (262, 362, 462, 562, 662, 762, 862, 962, 1062) are disposed between the surfaces 171a (271a, 371a, 471a, 571a, 671a, 771a, 871a, 971a, 1071a) and 175a (275a, 375a, 475a, 575a, 675a, 775a, 875a, 975a, 1075a). Therefore, the exit pupil can be positioned closer to the object. As a result, an increase in CRA can be suppressed.

[0339] 63 is a table showing the values ​​of various parameters in the imaging lenses 116, 216, 316, 416, 516, 616, 716, 816, 916, and 1016.

[0340] The table in Figure 63 lists the values ​​of RI / 2Y, f1 / f, fL / f, f / fLF, r1 / f, f / r2LF, BFC / f, BF0 / BFC, v1-v2, and L / 2Y for each of the imaging lenses 116, 216, 316, 416, 516, 616, 716, 816, 916, and 1016.

[0341] RI is the radius of curvature R of the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a). 2Y is the diagonal length 2Y １ ~2Y １０ f1 is the focal length of the lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071). f is the focal length f １ ~f １０ is a general term for

[0342] fL is the focal length of lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078). fLF is the focal length of lens 177 (277, 377, 477, 577, 677, 776, 875, 977, 1077). r1 is the radius of curvature R of surface 178a (278a, 378a, 478a, 578a, 678a, 777a, 876a, 978a, 1078a). r2LF is the radius of curvature R of surface 177b (277b, 377b, 477b, 577b, 677b, 776b, 875b, 977b, 1077b).

[0343] BFC is the distance BFC １ ~BFC １０ BF0 is the distance BF0 １ ~BF0 １０ v1 is the Abbe number vd of the lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071). V2 is the Abbe number vd of the lens 172 (272, 372, 472, 572, 672, 772, 872, 972, 1072). L is the distance L １ ~L １０ is a general term for

[0344] As shown in the table of FIG. 63, in the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), RI / 2Y satisfies the following conditional expression (1).

[0345] -10.0 < RI / 2Y < -1.8 ... (1)

[0346] Conditional expression (1) defines the optimal amount of curvature of the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a). When RI / 2Y is greater than the lower limit of conditional expression (1), the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a) is appropriately curved, thereby achieving the effects of correcting field curvature and mitigating CRA. On the other hand, when RI / 2Y is less than the upper limit of conditional expression (1), it is possible to prevent the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a) from being too curvature, which would make manufacturing difficult.

[0347] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), f1 / f satisfies the following conditional expression (2).

[0348] 0.7<f1 / f<1.8...(2)

[0349] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), fL / f satisfies the following conditional expression (3).

[0350] -1.0<fL / f<-0.5...(3)

[0351] Conditional expressions (2) and (3) define the appropriate degree of telephoto type of the lens configuration. When f1 / f exceeds the lower limit of conditional expression (2) and fL / f exceeds the lower limit of conditional expression (3), the refractive power of lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) and lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) does not become too strong. Therefore, the occurrence of aberrations can be suppressed.

[0352] When f1 / f is below the upper limit value of conditional expression (3) and fL / f is below the upper limit value of conditional expression (3), the degree of telephoto type can be maintained appropriately and the total optical length can be shortened. Note that the effect of shortening the total optical length can also be converted into the effect of reducing the FNo. That is, in the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), when the total optical length is equivalent to the total optical length of a conventional imaging lens, the FNo can be made smaller than that of a conventional imaging lens.

[0353] Here, in order to shorten the total optical length, it is desirable that the negative refractive power of the lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) be strong, but if this negative refractive power is strong, the light rays will be bounced up and the CRA will increase.

[0354] However, in the imaging lenses 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), as described above, the imaging surfaces 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a) have a curved shape, which allows the CRA to be reduced. Therefore, the lenses 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) can have appropriate negative refractive powers. Therefore, conditional expression (3) specifies the optimal negative refractive power of the lenses 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) when RI / 2Y satisfies conditional expression (1).

[0355] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), f / fLF satisfies the following conditional expression (4).

[0356] -0.1<f / fLF<1.3...(4)

[0357] Conditional expression (4) defines an appropriate refractive power of the lens 177 (277, 377, 477, 577, 677, 776, 875, 977, 1077). Specifically, conditional expression (4) is set so as to ensure an appropriate distance BFC, i.e., a back focus.

[0358] If f / fLF is outside the range of conditional expression (4), the refractive power of the lens 177 (277, 377, 477, 577, 677, 776, 875, 977, 1077) is too strong. Therefore, in order to ensure an appropriate distance BF0, it is necessary to increase the negative refractive power of the lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078).

[0359] However, as described above, as the negative refractive power of the lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078) increases, the CRA increases. Therefore, to suppress the increase in CRA, it is necessary to increase the positive refractive power of the peripheral portion of the lens 178 (278, 378, 478, 578, 678, 777, 876, 978, 1078). As a result, the peripheral portion of the surface 178a (278a, 378a, 478a, 578a, 678a, 777a, 876a, 978a, 1078a) significantly bulges toward the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a). This reduces the distance BFC.

[0360] Here, since the peripheral portion of the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a) is tilted toward the object side, the distance BFC becomes shorter than when the imaging surface is flat. Therefore, it is important to suppress the decrease in the distance BFC.

[0361] If the distance BFC is equal to or greater than a predetermined value, this is advantageous in terms of driving the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016) during autofocusing and in terms of visibility when dust adheres to optical members provided in the imaging surface clearance. The imaging surface clearance is the space between the surface 178a (278a, 378a, 478a, 578a, 678a, 777a, 876a, 978a, 1078a) and the imaging surface 133a (233a, 333a, 433a, 533a, 633a, 733a, 833a, 933a, 1033a).

[0362] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), r1 / f satisfies the following conditional expression (5).

[0363] 0.30<r1 / f<0.65...(5)

[0364] When r1 / f is greater than the lower limit of conditional expression (5), the radius of curvature R of the surfaces 171a (271a, 371a, 471a, 571a, 671a, 771a, 871a, 971a, 1071a) is not too small. Therefore, aberrations occurring at the surfaces 171a (271a, 371a, 471a, 571a, 671a, 771a, 871a, 971a, 1071a) can be suppressed. On the other hand, when r1 / f is less than the upper limit of conditional expression (5), the principal point position of the entire imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016) can be positioned on the object side. As a result, the overall optical length can be shortened.

[0365] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), f / r2LF satisfies the following conditional expression (6).

[0366] -3.0<f / r2LF<2.5...(6)

[0367] If f / r2LF is a negative value that exceeds the lower limit of conditional expression (6), the surfaces 177b (277b, 377b, 477b, 577b, 677b, 776b, 875b, 977b, 1077b) do not have a strong convexity, making it easy to ensure imaging surface clearance.

[0368] On the other hand, when f / r2LF is a positive value below the upper limit of conditional expression (6), the surfaces 177b (277b, 377b, 477b, 577b, 677b, 776b, 875b, 977b, 1077b) become concave surfaces with a diverging effect, making it easier to ensure imaging surface clearance.

[0369] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), BFC / f satisfies the following conditional expression (7).

[0370] 0.10<BFC / f<0.25...(7)

[0371] Conditional expression (7) is used to appropriately set the distance BFC. By setting BFC / f within the range of conditional expression (7), it is possible to shorten the overall optical length while ensuring sufficient imaging surface clearance. If sufficient imaging surface clearance is ensured, this is advantageous in terms of driving the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016) during autofocusing. This is also advantageous in terms of visibility (ease of conspicuousness) of dust adhering to optical members provided in the imaging surface clearance.

[0372] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), BF0 / BFC satisfies the following conditional expression (8).

[0373] 1.0≦BF0 / BFC<1.5...(8)

[0374] Conditional expression (8) defines an appropriate ratio between the distance BFC and the distance BF0. Even if the distance BF0 is sufficiently secured, if the distance BFC is short, it is not possible to secure a sufficient imaging surface clearance. When BF0 / BFC is within the range of conditional expression (8), it is possible to secure a sufficient imaging surface clearance.

[0375] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), v1-v2 satisfies the following conditional expression (9).

[0376] 28.0<v1-v2...(9)

[0377] Conditional expression (9) defines appropriate materials for the lens 171 (271, 371, 471, 571, 671, 771, 871, 971, 1071) and the lens 172 (272, 372, 472, 572, 672, 772, 872, 972, 1072). When v1-v2 is within the range defined by conditional expression (9), chromatic aberration can be effectively corrected.

[0378] In the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016), L / 2Y satisfies the following conditional expression (10).

[0379] L / 2Y<0.70...(10)

[0380] Conditional expression (10) defines the degree of miniaturization of the imaging lens 116 (216, 316, 416, 516, 616, 716, 816, 916, 1016). If L / 2Y is within the range defined by conditional expression (10), when the imaging device 100 or any of the second to tenth embodiments of the imaging device is mounted on a mobile device such as a smartphone, the amount of protrusion from the mobile device can be kept to a minimum.

[0381] 12. Application Examples to Electronic Devices The present technology can be applied to various electronic devices, such as digital still cameras, digital video cameras, mobile devices such as mobile phones and smartphones with imaging capabilities, monitors, and personal computers.

[0382] FIG. 64 is a block diagram showing an example of the hardware configuration of a smartphone as an electronic device to which the present technology is applied.

[0383] In the smartphone 2000 , a CPU (Central Processing Unit) 2001 , a ROM (Read Only Memory) 2002 , and a RAM (Random Access Memory) 2003 are interconnected by a bus 2004 .

[0384] An input / output interface 2005 is also connected to the bus 2004. An imaging unit 2006, an input unit 2007, an output unit 2008, and a communication unit 2009 are connected to the input / output interface 2005.

[0385] The imaging unit 2006 is configured by the imaging device 100 or the second to tenth embodiments of the imaging device described above. The imaging unit 2006 captures an image of an object and acquires an image. This image is stored in the RAM 2003 or displayed on the output unit 2008. The input unit 2007 is configured by a touchpad, which is a position input device that constitutes a touch panel, a microphone, etc. The output unit 2008 is configured by a liquid crystal panel that constitutes a touch panel, a speaker, etc. The communication unit 2009 is configured by a network interface, etc.

[0386] In the smartphone 2000 configured as described above, the above-described effects can be obtained by applying the imaging device 100 or the second to tenth embodiments of the imaging device as the imaging unit 2006. That is, it is possible to capture high-quality images with a low profile.

[0387] 13. Usage Examples of the Imaging Device FIG. 65 is a diagram showing usage examples of the imaging device 100 and the imaging devices according to the second to tenth embodiments.

[0388] The imaging device 100 and the second to tenth embodiments of the imaging device described above can be used in various cases where light such as visible light, infrared light, ultraviolet light, and X-rays is sensed, for example, as follows:

[0389] ・Devices for taking images for viewing purposes, such as digital cameras and mobile devices with camera functions. ・Devices for traffic purposes, such as in-vehicle sensors that take images of the front, rear, surroundings, and interior of a car for safe driving such as automatic stopping, and for recognizing the driver's state, surveillance cameras that monitor moving vehicles and roads, and distance measuring sensors that measure distances between vehicles. ・Devices for home appliances such as TVs, refrigerators, and air conditioners that take images of user gestures and operate the device according to those gestures. ・Devices for medical and healthcare purposes, such as endoscopes and devices that take images of blood vessels by receiving infrared light. ・Devices for security purposes, such as surveillance cameras for crime prevention and cameras for person authentication. ・Devices for beauty purposes, such as skin measuring devices that take images of the skin and microscopes that take images of the scalp. ・Devices for sports purposes, such as action cameras and wearable cameras for sports, etc. ・Devices for agricultural purposes, such as cameras to monitor the condition of fields and crops.

[0390] 14. Application Example to Endoscopic Surgery System The technology according to the present disclosure (the present technology) can be applied to various products. For example, the technology according to the present disclosure may be applied to an endoscopic surgery system.

[0391] FIG. 66 is a diagram showing an example of a schematic configuration of an endoscopic surgery system to which the technology according to the present disclosure (the present technology) can be applied.

[0392] Figure 66 shows an operator (doctor) 11131 performing surgery on a patient 11132 on a patient bed 11133 using an endoscopic surgery system 11000. As shown in the figure, the endoscopic surgery system 11000 is composed of an endoscope 11100, other surgical tools 11110 such as an insufflation tube 11111 and an energy treatment tool 11112, a support arm device 11120 that supports the endoscope 11100, and a cart 11200 on which various devices for endoscopic surgery are mounted.

[0393] The endoscope 11100 is composed of a lens barrel 11101, a region of a predetermined length from the tip of which is inserted into a body cavity of a patient 11132, and a camera head 11102 connected to the base end of the lens barrel 11101. In the example shown, the endoscope 11100 is configured as a so-called rigid scope having a rigid lens barrel 11101, but the endoscope 11100 may also be configured as a so-called flexible scope having a flexible lens barrel.

[0394] An opening into which an objective lens is fitted is provided at the tip of the lens barrel 11101. A light source device 11203 is connected to the endoscope 11100, and light generated by the light source device 11203 is guided to the tip of the lens barrel by a light guide extending inside the lens barrel 11101, and is irradiated via the objective lens toward an object to be observed inside the body cavity of the patient 11132. The endoscope 11100 may be a direct-viewing endoscope, an oblique-viewing endoscope, or a side-viewing endoscope.

[0395] An optical system and an image sensor are provided inside the camera head 11102, and light reflected from the object of observation (observation light) is collected by the optical system onto the image sensor. The observation light is photoelectrically converted by the image sensor to generate an electrical signal corresponding to the observation light, i.e., an image signal corresponding to the observed image. The image signal is sent to a camera control unit (CCU) 11201 as RAW data.

[0396] The CCU 11201 is configured with a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), etc., and comprehensively controls the operations of the endoscope 11100 and the display device 11202. Furthermore, the CCU 11201 receives an image signal from the camera head 11102 and performs various types of image processing on the image signal, such as development processing (demosaic processing), to display an image based on the image signal.

[0397] Under the control of the CCU 11201, the display device 11202 displays an image based on an image signal that has been subjected to image processing by the CCU 11201.

[0398] The light source device 11203 is composed of a light source such as an LED (Light Emitting Diode), and supplies the endoscope 11100 with irradiation light when photographing the surgical site, etc.

[0399] The input device 11204 is an input interface for the endoscopic surgery system 11000. A user can input various information and instructions to the endoscopic surgery system 11000 via the input device 11204. For example, the user inputs an instruction to change the imaging conditions (type of irradiation light, magnification, focal length, etc.) of the endoscope 11100.

[0400] The treatment tool control device 11205 controls the driving of the energy treatment tool 11112 for cauterizing tissue, incising, sealing blood vessels, etc. The insufflation device 11206 inflates the body cavity of the patient 11132 through the insufflation tube 11111 in order to ensure a clear field of view for the endoscope 11100 and a working space for the surgeon. The recorder 11207 is a device capable of recording various types of information related to the surgery. The printer 11208 is a device capable of printing various types of information related to the surgery in various formats such as text, images, or graphs.

[0401] The light source device 11203, which supplies illumination light to the endoscope 11100 when photographing the surgical site, can be configured from a white light source, such as an LED, a laser light source, or a combination of these. When the white light source is configured from a combination of RGB laser light sources, the output intensity and output timing of each color (each wavelength) can be controlled with high precision, allowing the light source device 11203 to adjust the white balance of the captured image. In this case, it is also possible to time-share images corresponding to each RGB by irradiating the object of observation with laser light from each RGB laser light source and controlling the drive of the image sensor of the camera head 11102 in synchronization with the irradiation timing. According to this method, color images can be obtained without providing a color filter to the image sensor.

[0402] Furthermore, the light source device 11203 may be controlled to change the intensity of light it outputs at predetermined time intervals. By controlling the driving of the image sensor of the camera head 11102 in synchronization with the timing of the change in light intensity to acquire images in a time-division manner and combining the images, it is possible to generate an image with a high dynamic range that is free from so-called blocked-up shadows and blown-out highlights.

[0403] The light source device 11203 may also be configured to supply light in a predetermined wavelength band corresponding to special light observation. Special light observation, for example, utilizes the wavelength dependence of light absorption in body tissues to irradiate light in a narrower band than the light irradiated during normal observation (i.e., white light) to capture high-contrast images of specific tissues, such as blood vessels on the surface of mucous membranes, in what is known as narrow band imaging. Alternatively, special light observation may involve fluorescence observation, in which images are obtained using fluorescence generated by irradiating excitation light. Fluorescence observation may involve irradiating excitation light onto body tissues and observing the fluorescence from the tissues (autofluorescence observation), or may involve locally injecting a reagent such as indocyanine green (ICG) into the body tissue and irradiating the tissues with excitation light corresponding to the fluorescent wavelength of the reagent to obtain a fluorescent image. The light source device 11203 may be configured to supply narrow band light and / or excitation light corresponding to such special light observation.

[0404] Figure 67 is a block diagram showing an example of the functional configuration of the camera head 11102 and CCU 11201 shown in Figure 66.

[0405] The camera head 11102 has a lens unit 11401, an imaging unit 11402, a drive unit 11403, a communication unit 11404, and a camera head control unit 11405. The CCU 11201 has a communication unit 11411, an image processing unit 11412, and a control unit 11413. The camera head 11102 and the CCU 11201 are connected to each other via a transmission cable 11400 so that they can communicate with each other.

[0406] The lens unit 11401 is an optical system provided at the connection portion with the lens barrel 11101. Observation light taken in from the tip of the lens barrel 11101 is guided to the camera head 11102 and enters the lens unit 11401. The lens unit 11401 is composed of a combination of multiple lenses including a zoom lens and a focus lens.

[0407] The imaging unit 11402 is composed of an imaging element. The imaging element constituting the imaging unit 11402 may be a single (so-called single-chip type) or multiple (so-called multi-chip type). When the imaging unit 11402 is composed of a multi-chip type, for example, each imaging element may generate an image signal corresponding to each of RGB, and a color image may be obtained by combining these signals. Alternatively, the imaging unit 11402 may be configured to have a pair of imaging elements for acquiring image signals for the right eye and the left eye corresponding to 3D (dimensional) display. The 3D display allows the surgeon 11131 to more accurately grasp the depth of the biological tissue at the surgical site. Note that when the imaging unit 11402 is composed of a multi-chip type, multiple lens units 11401 may be provided corresponding to each imaging element.

[0408] Furthermore, the imaging unit 11402 does not necessarily have to be provided in the camera head 11102. For example, the imaging unit 11402 may be provided inside the lens barrel 11101, immediately after the objective lens.

[0409] The driving unit 11403 is configured by an actuator, and moves the zoom lens and focus lens of the lens unit 11401 by a predetermined distance along the optical axis under the control of the camera head control unit 11405. This allows the magnification and focus of the image captured by the imaging unit 11402 to be adjusted appropriately.

[0410] The communication unit 11404 is configured by a communication device for transmitting and receiving various types of information to and from the CCU 11201. The communication unit 11404 transmits the image signal obtained from the imaging unit 11402 to the CCU 11201 via the transmission cable 11400 as RAW data.

[0411] Furthermore, the communication unit 11404 receives a control signal for controlling the driving of the camera head 11102 from the CCU 11201 and supplies the control signal to the camera head control unit 11405. The control signal includes information on the imaging conditions, such as information specifying the frame rate of the captured image, information specifying the exposure value at the time of imaging, and / or information specifying the magnification and focus of the captured image.

[0412] The image capturing conditions such as the frame rate, exposure value, magnification, and focus may be appropriately specified by the user, or may be automatically set by the control unit 11413 of the CCU 11201 based on the acquired image signal. In the latter case, the endoscope 11100 is equipped with a so-called AE (Auto Exposure) function, AF (Auto Focus) function, and AWB (Auto White Balance) function.

[0413] The camera head control unit 11405 controls the driving of the camera head 11102 based on a control signal received from the CCU 11201 via the communication unit 11404 .

[0414] The communication unit 11411 is configured by a communication device for transmitting and receiving various information to and from the camera head 11102. The communication unit 11411 receives an image signal transmitted from the camera head 11102 via the transmission cable 11400.

[0415] Furthermore, the communication unit 11411 transmits to the camera head 11102 a control signal for controlling the driving of the camera head 11102. The image signal and the control signal can be transmitted by electrical communication, optical communication, or the like.

[0416] The image processing unit 11412 performs various image processing operations on the image signal, which is RAW data transmitted from the camera head 11102 .

[0417] The control unit 11413 performs various controls related to the imaging of the surgical site, etc. by the endoscope 11100 and the display of the captured image obtained by imaging the surgical site, etc. For example, the control unit 11413 generates a control signal for controlling the driving of the camera head 11102.

[0418] Furthermore, the control unit 11413 displays the captured image showing the surgical site, etc., on the display device 11202 based on the image signal subjected to image processing by the image processing unit 11412. At this time, the control unit 11413 may recognize various objects in the captured image using various image recognition technologies. For example, the control unit 11413 can recognize surgical tools such as forceps, specific biological parts, bleeding, mist generated when using the energy treatment tool 11112, etc., by detecting the shape and color of the edges of objects included in the captured image. When displaying the captured image on the display device 11202, the control unit 11413 may use the recognition results to superimpose various surgical support information on the image of the surgical site. By superimposing the surgical support information and presenting it to the surgeon 11131, the burden on the surgeon 11131 can be reduced and the surgeon 11131 can proceed with the surgery reliably.

[0419] The transmission cable 11400 connecting the camera head 11102 and the CCU 11201 is an electrical signal cable for electrical signal communication, an optical fiber for optical communication, or a composite cable of these.

[0420] In the illustrated example, communication is performed wired using a transmission cable 11400, but communication between the camera head 11102 and the CCU 11201 may also be performed wirelessly.

[0421] The foregoing describes an example of an endoscopic surgery system to which the technology disclosed herein can be applied. The technology disclosed herein can be applied to the lens unit 11401, the image capturing unit 11402, and other components of the above-described configuration. Specifically, the image capturing device 100 and the second to tenth embodiments of the image capturing device described above can be applied to the lens unit 11401, the image capturing unit 11402, and the drive unit 11403. By applying the technology disclosed herein to the lens unit 11401 and the image capturing unit 11402, high-quality images can be captured with a low profile. As a result, for example, a surgeon can reliably confirm the surgical site using high-quality images captured by the compact camera head 11102.

[0422] Although an endoscopic surgery system has been described as an example here, the technology disclosed herein may also be applied to other systems, such as a microsurgery system.

[0423] 15. Application Examples to Mobile Bodies The technology according to the present disclosure (the present technology) can be applied to various products. For example, the technology according to the present disclosure may be realized as a device mounted on any type of mobile body, such as an automobile, an electric vehicle, a hybrid electric vehicle, a motorcycle, a bicycle, personal mobility, an airplane, a drone, a ship, or a robot.

[0424] FIG. 68 is a block diagram showing a schematic configuration example of a vehicle control system, which is an example of a mobile object control system to which the technology of the present disclosure can be applied.

[0425] The vehicle control system 12000 includes a plurality of electronic control units connected via a communication network 12001. In the example shown in Fig. 68, the vehicle control system 12000 includes a drive system control unit 12010, a body system control unit 12020, an outside-vehicle information detection unit 12030, an inside-vehicle information detection unit 12040, and an integrated control unit 12050. Also shown as functional components of the integrated control unit 12050 are a microcomputer 12051, an audio / video output unit 12052, and an in-vehicle network I / F (Interface) 12053.

[0426] The drivetrain control unit 12010 controls the operation of devices related to the drivetrain of the vehicle in accordance with various programs. For example, the drivetrain control unit 12010 functions as a control device for a drive force generating device for generating a drive force of the vehicle, such as an internal combustion engine or a drive motor, a drive force transmission mechanism for transmitting the drive force to the wheels, a steering mechanism for adjusting the steering angle of the vehicle, and a braking device for generating a braking force of the vehicle.

[0427] The body system control unit 12020 controls the operation of various devices equipped in the vehicle body according to various programs. For example, the body system control unit 12020 functions as a control device for a keyless entry system, a smart key system, a power window device, or various lamps such as headlamps, backup lamps, brake lamps, turn signals, and fog lamps. In this case, radio waves transmitted from a portable device that serves as a key or signals from various switches can be input to the body system control unit 12020. The body system control unit 12020 receives these radio waves or signals and controls the vehicle's door lock device, power window device, lamps, etc.

[0428] The outside-vehicle information detection unit 12030 detects information outside the vehicle equipped with the vehicle control system 12000. For example, an imaging unit 12031 is connected to the outside-vehicle information detection unit 12030. The outside-vehicle information detection unit 12030 causes the imaging unit 12031 to capture images outside the vehicle and receives the captured images. The outside-vehicle information detection unit 12030 may perform object detection processing or distance detection processing for people, cars, obstacles, signs, characters on the road surface, etc. based on the received images.

[0429] The imaging unit 12031 is an optical sensor that receives light and outputs an electrical signal corresponding to the amount of light received. The imaging unit 12031 can output the electrical signal as an image or as distance measurement information. The light received by the imaging unit 12031 may be visible light or invisible light such as infrared light.

[0430] The in-vehicle information detection unit 12040 detects information inside the vehicle. For example, a driver state detection unit 12041 that detects the state of the driver is connected to the in-vehicle information detection unit 12040. The driver state detection unit 12041 includes, for example, a camera that captures an image of the driver, and the in-vehicle information detection unit 12040 may calculate the degree of fatigue or concentration of the driver based on the detection information input from the driver state detection unit 12041, or may determine whether the driver is dozing off.

[0431] The microcomputer 12051 can calculate control target values ​​for the driving force generating device, steering mechanism, or braking device based on the information inside and outside the vehicle acquired by the outside-vehicle information detection unit 12030 or the inside-vehicle information detection unit 12040, and output control commands to the drive system control unit 12010. For example, the microcomputer 12051 can perform cooperative control aimed at realizing the functions of an ADAS (Advanced Driver Assistance System), including vehicle collision avoidance or impact mitigation, following driving based on the distance between vehicles, maintaining vehicle speed, vehicle collision warning, vehicle lane departure warning, etc.

[0432] In addition, the microcomputer 12051 can perform cooperative control for the purpose of autonomous driving, which allows the vehicle to travel autonomously without relying on driver operation, by controlling the driving force generating device, steering mechanism, braking device, etc. based on information about the surroundings of the vehicle obtained by the outside vehicle information detection unit 12030 or the inside vehicle information detection unit 12040.

[0433] Furthermore, the microcomputer 12051 can output a control command to the body system control unit 12020 based on the information outside the vehicle acquired by the outside information detection unit 12030. For example, the microcomputer 12051 can control the headlamps according to the position of a preceding vehicle or an oncoming vehicle detected by the outside information detection unit 12030, and perform cooperative control aimed at preventing glare, such as switching from high beams to low beams.

[0434] The audio / video output unit 12052 transmits at least one of audio and video output signals to an output device capable of visually or audibly notifying the passengers of the vehicle or the outside of the vehicle of information. In the example of Fig. 68, the output devices are exemplified by an audio speaker 12061, a display unit 12062, and an instrument panel 12063. The display unit 12062 may include, for example, at least one of an on-board display and a head-up display.

[0435] FIG. 69 is a diagram showing an example of the installation position of the imaging unit 12031.

[0436] In FIG. 69, the imaging unit 12031 includes imaging units 12101, 12102, 12103, 12104, and 12105.

[0437] The imaging units 12101, 12102, 12103, 12104, and 12105 are provided, for example, at positions such as the front nose, side mirrors, rear bumper, back door, and the top of the windshield inside the vehicle cabin of the vehicle 12100. The imaging unit 12101 provided on the front nose and the imaging unit 12105 provided on the top of the windshield inside the vehicle cabin mainly acquire images of the front of the vehicle 12100. The imaging units 12102 and 12103 provided on the side mirrors mainly acquire images of the sides of the vehicle 12100. The imaging unit 12104 provided on the rear bumper or back door mainly acquires images of the rear of the vehicle 12100. The imaging unit 12105 provided on the top of the windshield inside the vehicle cabin is mainly used to detect preceding vehicles, pedestrians, obstacles, traffic lights, traffic signs, lanes, etc.

[0438] 69 shows an example of the imaging ranges of the imaging units 12101 to 12104. Imaging range 12111 indicates the imaging range of the imaging unit 12101 provided on the front nose, imaging ranges 12112 and 12113 indicate the imaging ranges of the imaging units 12102 and 12103 provided on the side mirrors, respectively, and imaging range 12114 indicates the imaging range of the imaging unit 12104 provided on the rear bumper or back door. For example, by overlaying the image data captured by the imaging units 12101 to 12104, an overhead image of the vehicle 12100 viewed from above can be obtained.

[0439] At least one of the image capturing units 12101 to 12104 may have a function of acquiring distance information. For example, at least one of the image capturing units 12101 to 12104 may be a stereo camera made up of multiple image capturing elements, or may be an image capturing element having pixels for phase difference detection.

[0440] For example, based on the distance information obtained from the imaging units 12101 to 12104, the microcomputer 12051 can calculate the distance to each three-dimensional object within the imaging ranges 12111 to 12114 and the change in this distance over time (relative speed with respect to the vehicle 12100), thereby extracting as a preceding vehicle, in particular, the three-dimensional object that is the closest three-dimensional object on the path of the vehicle 12100 and traveling in approximately the same direction as the vehicle 12100 at a predetermined speed (e.g., 0 km / h or higher). Furthermore, the microcomputer 12051 can set a vehicle-to-vehicle distance to be maintained in advance in front of the preceding vehicle, and perform automatic braking control (including follow-up stop control), automatic acceleration control (including follow-up start control), etc. In this way, cooperative control can be performed for the purpose of autonomous driving, which allows the vehicle to travel autonomously without relying on driver operation.

[0441] For example, the microcomputer 12051 classifies and extracts three-dimensional object data regarding three-dimensional objects into two-wheeled vehicles, ordinary vehicles, large vehicles, pedestrians, utility poles, and other three-dimensional objects based on distance information obtained from the imaging units 12101 to 12104, and can use the data for automatic obstacle avoidance. For example, the microcomputer 12051 distinguishes obstacles around the vehicle 12100 into obstacles that are visible to the driver of the vehicle 12100 and obstacles that are difficult to see. The microcomputer 12051 then determines a collision risk that indicates the risk of collision with each obstacle, and when the collision risk is equal to or greater than a set value and a collision is possible, the microcomputer 12051 can provide driving assistance for collision avoidance by outputting an alarm to the driver via the audio speaker 12061 or the display unit 12062, or by performing forced deceleration or avoidance steering via the drive system control unit 12010.

[0442] At least one of the image capturing units 12101 to 12104 may be an infrared camera that detects infrared rays. For example, the microcomputer 12051 can recognize a pedestrian by determining whether a pedestrian is present in the images captured by the image capturing units 12101 to 12104. Such pedestrian recognition is performed, for example, by extracting feature points from the images captured by the image capturing units 12101 to 12104 as infrared cameras and performing pattern matching on a series of feature points that indicate the outline of an object to determine whether the object is a pedestrian. When the microcomputer 12051 determines that a pedestrian is present in the images captured by the image capturing units 12101 to 12104 and recognizes the pedestrian, the audio / image output unit 12052 controls the display unit 12062 to superimpose a rectangular outline on the recognized pedestrian for emphasis. The audio / image output unit 12052 may also control the display unit 12062 to display an icon or the like indicating the pedestrian at a desired position.

[0443] An example of a vehicle control system to which the technology according to the present disclosure can be applied has been described above. The technology according to the present disclosure can be applied to the imaging unit 12031 and other components of the above-described configuration. Specifically, the imaging device 100 and the second to tenth embodiments of the imaging device described above can be applied to the imaging unit 12031. By applying the technology according to the present disclosure to the imaging unit 12031, high-quality images can be captured with a low profile. As a result, high-quality images can be obtained with the compact imaging unit 12031, which can improve driver safety and comfort, for example.

[0444] The embodiments of the present technology are not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present technology.

[0445] For example, it is possible to adopt a configuration in which all or part of the above-described embodiments are combined.

[0446] The effects described in this specification are merely examples and are not limiting, and other effects may also be present.

[0447] The present technology can take the following configurations. (1) A lens group consisting of six or more lenses that forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is tilted toward the object, wherein at least one surface of a first lens that is the lens closest to the object in the lens group is aspherical, the first lens having positive refractive power, a peripheral portion of a surface of a second lens that is the second lens from the object side in the lens group that is on the imaging surface side that is tilted toward the imaging surface, both surfaces of a final lens that is the lens closest to the imaging surface in the lens group are aspherical, and the final lens has negative refractive power, wherein RI is the radius of curvature of the imaging surface, 2Y is the diagonal length of the imaging surface, f1 is the focal length of the first lens, fL is the focal length of the final lens, fLF is the focal length of the final lens that is the second lens from the imaging surface side in the lens group, and f is the focal length of the entire imaging lens, An imaging lens configured to satisfy -1.0 < fL / f < -0.5 -0.1 < f / fLF < 1.3. (2) The imaging lens according to (1), wherein the first lens has a meniscus shape with a convex surface facing the object side, and is configured to satisfy 0.30 < r1 / f < 0.65, where r1 is the radius of curvature of the object-side surface of the final lens and f is the focal length of the entire imaging lens. (3) The imaging lens according to (1) or (2), wherein r2LF is the radius of curvature of the imaging plane-side surface of the final front lens and f is the focal length of the entire imaging lens, and is configured to satisfy -3.0 < f / r2LF < 2.5. (4) The imaging lens according to any of (1) to (3), wherein the object-side surface of the final lens has an extremum. (5) The imaging lens according to any of (1) to (4), wherein the object-side surface of the final front lens has an extremum.(6) The imaging lens according to any of (1) to (5), configured to satisfy 0.10 < BFC / f < 0.25, where BFC is the distance in the optical axis direction between the most convex part of the surface of the last lens facing the imaging plane and the imaging plane, and f is the focal length of the entire imaging lens. (7) The imaging lens according to any of (1) to (6), configured to satisfy 1.0 ≦ BF0 / BFC < 1.5, where BF0 is the distance on the optical axis between the surface of the last lens facing the imaging plane and the imaging plane, and BFC is the distance in the optical axis direction between the most convex part of the surface of the last lens facing the imaging plane and the imaging plane. (8) The imaging lens according to any of (1) to (7), further comprising: an aperture diaphragm arranged between the object-side surface of the first lens and the object-side surface of a fifth lens that is the fifth lens from the object side in the lens group. (9) The imaging lens according to any one of (1) to (8), configured to satisfy 28.0<v1-v2, where v1 is the Abbe number of the first lens and v2 is the Abbe number of the second lens. (10) The imaging lens according to any one of (1) to (9), configured to satisfy L / 2Y<0.70, where L is the distance on the optical axis from the object-side surface of the first lens to an image point when a light ray parallel to the optical axis is incident on the imaging lens, and 2Y is the diagonal length of the imaging surface.(11) A lens group consisting of six or more lenses that forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is inclined toward the object side, wherein at least one surface of a first lens that is the lens closest to the object in the lens group is aspherical, and the first lens has positive refractive power, a peripheral portion of a surface of a second lens that is the second lens from the object side in the lens group, on the imaging surface side, is inclined toward the imaging surface side, and both surfaces of a final lens that is the lens closest to the imaging surface in the lens group are aspherical, and the final lens has negative refractive power, wherein: RI is the radius of curvature of the imaging surface, 2Y is the diagonal length of the imaging surface, f1 is the focal length of the first lens, fL is the focal length of the final lens, fLF is the focal length of the final lens that is the second lens from the imaging surface side in the lens group, and f is the focal length of the entire imaging lens; An imaging device comprising: an imaging lens configured to satisfy -1.0<fL / f<-0.5 -0.1<f / fLF<1.3; and an imaging element having the imaging surface and converting the optical image formed on the imaging surface into an electrical signal.

[0448] 100 imaging device, 116 imaging lens, 133 imaging element, 133a imaging surface, 161 lens group, 162 aperture stop, 171 to 178 lenses, 271a to 278a, 277b to 278b surfaces, 216 imaging lens, 233a imaging surface, 261 lens group, 262 aperture stop, 271 to 278 lenses, 271a to 278a, 271b to 278b surfaces, 316 imaging lens, 333a imaging surface, 361 lens group, 362 aperture stop, 371 to 378 lenses, 371a to 378a, 371b to 378b surfaces, 416 imaging lens, 433a imaging surface, 461 lens group, 462 Aperture diaphragm, 471 to 478 lenses, 471a to 478a, 471b to 478b surfaces, 516 imaging lens, 533a imaging surface, 561 lens group, 562 aperture diaphragm, 571 to 578 lenses, 571a to 578a, 571b to 578b surfaces, 616 imaging lens, 633a imaging surface, 661 lens group, 662 aperture diaphragm, 671 to 678 lenses, 671a to 678a, 671b to 678b surfaces, 716 imaging lens, 733a imaging surface, 761 lens group, 762 aperture diaphragm, 771 to 777 lenses, 771a to 777a, 771b to 778b surfaces, 816 Imaging lens, 833a imaging surface, 861 lens group, 862 aperture stop, 871 to 876 lenses, 871a to 876a, 871b to 876b surfaces, 916 imaging lens, 933a imaging surface, 961 lens group, 962 aperture stop, 971 to 978 lenses, 971a to 978a, 971b to 978b surfaces, 1016 imaging lens, 1033a imaging surface, 1061 lens group, 1062 aperture stop, 1071 to 1078 lenses, 1071a to 1078a, 1071b to 1078b surfaces

Claims

1. A lens group consisting of six or more lenses that forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is tilted toward the object, wherein at least one surface of a first lens that is the lens closest to the object in said lens group is aspherical, and said first lens has positive refractive power, and a second lens that is the second lens from the object side in said lens group has a peripheral portion of its surface on the imaging surface side that is tilted toward the imaging surface, and both surfaces of a final lens that is the lens closest to the imaging surface in said lens group are aspherical, and said final lens has negative refractive power, wherein RI is the radius of curvature of the imaging surface, 2Y is the diagonal length of the imaging surface, f1 is the focal length of said first lens, fL is the focal length of said final lens, fLF is the focal length of the final lens that is the second lens from the imaging surface side in said lens group, and f is the focal length of the entire imaging lens, An imaging lens configured to satisfy -1.0<fL / f<-0.5 -0.1<f / fLF<1.

3.

2. The imaging lens according to claim 1, wherein the first lens has a meniscus shape with a convex surface facing the object side, and is configured so that, when the radius of curvature of the object-side surface of the final lens is r1 and the focal length of the entire imaging lens is f, the following relationship is satisfied: 0.30 < r1 / f < 0.

65.

3. The imaging lens according to claim 1, configured to satisfy the following relationship: -3.0<f / r2LF<2.5, where r2LF is the radius of curvature of the surface of the final front lens element facing the imaging plane, and f is the focal length of the entire imaging lens.

4. The imaging lens according to claim 1, wherein the object-side surface of the final lens is configured to have an extremum.

5. The imaging lens according to claim 1, wherein the object-side surface of the final front lens element is configured to have an extremum.

6. The imaging lens according to claim 1, configured to satisfy the following relationship: 0.10<BFC / f<0.25, where BFC is the distance in the optical axis direction between the most convex part of the surface of the final lens facing the imaging surface and the imaging surface, and f is the focal length of the entire imaging lens.

7. The imaging lens according to claim 1, configured to satisfy the following relationship: 1.0≦BF0 / BFC<1.5, where BF0 is the distance on the optical axis between the surface of said final lens element facing said imaging surface and said imaging surface, and BFC is the distance in the optical axis direction between the most convex part of the surface of said final lens element facing said imaging surface and said imaging surface.

8. The imaging lens according to claim 1, further comprising an aperture stop arranged between the object-side surface of the first lens and the object-side surface of a fifth lens that is the fifth lens from the object side in the lens group.

9. The imaging lens according to claim 1, configured so as to satisfy the following relationship: 28.0<v1-v2, where v1 is the Abbe number of the first lens and v2 is the Abbe number of the second lens.

10. The imaging lens according to claim 1, configured to satisfy the relationship L / 2Y<0.70, where L is the distance on the optical axis from the object-side surface of the first lens to an image point when a ray of light parallel to the optical axis is incident on the imaging lens, and 2Y is the diagonal length of the imaging surface.

11. A lens group consisting of six or more lenses that forms an optical image of an object on an imaging surface that is curved so that a peripheral portion thereof is tilted toward the object, wherein at least one surface of a first lens that is the lens closest to the object in said lens group is aspherical, said first lens having positive refractive power, a peripheral portion of a surface of a second lens that is the second lens from the object side in said lens group that is on the imaging surface side that is tilted toward the imaging surface, both surfaces of a final lens that is the lens closest to the imaging surface in said lens group are aspherical, and said final lens has negative refractive power, wherein: RI is the radius of curvature of said imaging surface, 2Y is the diagonal length of said imaging surface, f1 is the focal length of said first lens, fL is the focal length of said final lens, fLF is the focal length of the final lens that is the second lens from the imaging surface side in said lens group, and f is the focal length of the entire imaging lens; An imaging device comprising: an imaging lens configured to satisfy -1.0<fL / f<-0.5 -0.1<f / fLF<1.3; and an imaging element having the imaging surface and converting the optical image formed on the imaging surface into an electrical signal.

Images