Converter lens and imaging apparatus

Abstract

To achieve reduction in size, high versatility, and high image quality.SOLUTION: A converter lens is a converter lens which is arranged on an image surface side with respect to an image-formation optical system and re-forms an image formed by the image-formation optical system and includes a plurality of lenses including at least one single lens or at least one cemented lens. The plurality of lenses include a first single lens or a first cemented lens arranged on the most object side in the converter lens. The surface on the object side of the first single lens or the first cemented lens is arranged in a position closer to the object side than the primary image-formation point of the image-formation optical system. The primary image-formation point exists outside the plurality of lenses constituting the converter lens. The converter lens satisfies a predetermined conditional expression.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a converter lens and an imaging device. [Background technology]

[0002] One imaging optical system used in an imaging device (camera) is a converter lens that is attached between the imaging device and a master lens, which is a lens device that can be attached to or detached from the imaging device. Attaching a converter lens to the master lens makes it possible to expand the imaging function or increase the imaging magnification, etc. One type of converter lens is a re-imaging converter lens that re-images the image formed by the master lens (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-118807 [Patent Document 2] Japanese Patent Application Publication No. 2018-72366 Summary of the Invention [Problem to be solved by the invention]

[0004] With the configurations of the reimaging converter lenses proposed in Patent Documents 1 and 2, it is difficult to achieve miniaturization and high image quality.

[0005] It is desirable to provide a converter lens that is small, versatile, and capable of achieving high image quality, and an imaging device that includes such a converter lens. [Means for solving the problem]

[0006] A converter lens according to one embodiment of the present disclosure is a converter lens that is arranged on the image plane side of an imaging optical system and re-images an image formed by the imaging optical system, and includes a plurality of lenses including at least one single lens or at least one cemented lens, and the plurality of lenses include a first single lens or a first cemented lens that is arranged closest to the object within the converter lens, and the object-side surface of the first single lens or the first cemented lens is arranged closer to the object than a primary image point of the imaging optical system, and the primary image point exists outside the plurality of lenses that constitute the converter lens, and satisfies the following conditional expression: 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 ……(2) however, da: distance from the vertex of the object side of the first single lens or the first cemented lens to the primary image point db: distance from the vertex of the object side of the first single lens or the first cemented lens to the secondary image point dc: distance from the vertex of the lens surface closest to the primary image point to the primary image point Let's say.

[0007] An imaging device according to one embodiment of the present disclosure includes a converter lens that is arranged on the image plane side of the imaging optical system and re-images the image formed by the imaging optical system, and an imaging element that outputs an imaging signal corresponding to the optical image formed by the converter lens, and the converter lens is constructed using the converter lens according to the embodiment of the present disclosure.

[0008] In a converter lens or an imaging device according to an embodiment of the present disclosure, the lens configuration is optimized to be small, highly versatile, and capable of achieving high image quality. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) showing a first configuration example (Example 1) of an optical system equipped with a converter lens according to an embodiment of the present disclosure. [Figure 2] 2 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 1 when focused at infinity. [Figure 3] 2 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 1 when focusing on a close distance. [Figure 4] 2 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 1 when focused at infinity. [Figure 5] 2 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 1 when focusing on a close distance. [Figure 6] 1 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) showing a first configuration example (Example 1) of an optical system equipped with a converter lens according to an embodiment. [Figure 7] 7 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 6 when focused on infinity. [Figure 8] 7 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 6 when focusing on a close distance. [Figure 9] 7 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 6 when focused on infinity. [Figure 10] 7 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 6 when focusing on a close distance. [Figure 11] FIG. 10 is a lens cross-sectional view showing a second configuration example (Example 2) of an optical system equipped with a converter lens according to an embodiment. [Figure 12] 12 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 11 when focused on infinity. [Figure 13] 12 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 11 when focusing on a close object. [Figure 14] 12 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 11 when focused on infinity. [Figure 15] 12 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 11 when focusing on a close distance. [Figure 16] 10 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) showing a third configuration example (Example 3) of an optical system equipped with a converter lens according to an embodiment. FIG. [Figure 17]17 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 16 when focused on infinity. [Figure 18] 17 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 16 when focusing on a close distance. [Figure 19] 17 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 16 when focused on infinity. [Figure 20] 17 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 16 when focusing on a close distance. [Figure 21] 10 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) showing a third configuration example (Example 3) of an optical system equipped with a converter lens according to an embodiment. FIG. [Figure 22] 22 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 21 when focused on infinity. [Figure 23] 22 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 21 when focusing on a close distance. [Figure 24] 22 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 21 when focused on infinity. [Figure 25] 22 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 21 when focusing on a close distance. [Figure 26] 10 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) showing a fourth configuration example (Example 4) of an optical system equipped with a converter lens according to an embodiment. FIG. [Figure 27] FIG. 27 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 26 when focused on infinity. [Figure 28] 27 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 26 when focusing on a close distance. [Figure 29] 27 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 26 when focused on infinity. [Figure 30] 27 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 26 when focusing on a close distance. [Figure 31] 10 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) showing a fourth configuration example (Example 4) of an optical system equipped with a converter lens according to an embodiment. FIG. [Figure 32]32 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 31 when focused on infinity. [Figure 33] 32 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 31 when focusing on a close distance. [Figure 34] 32 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 31 when focused on infinity. [Figure 35] 32 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 31 when focusing on a close distance. [Figure 36] FIG. 10 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) showing a fifth configuration example (Example 5) of an optical system equipped with a converter lens according to an embodiment. [Figure 37] FIG. 37 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 36 when focused on infinity. [Figure 38] 37 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 36 when focusing on a close distance. [Figure 39] 37 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 36 when focused at infinity. [Figure 40] 37 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 36 when focusing on a close distance. [Figure 41] FIG. 10 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) showing a fifth configuration example (Example 5) of an optical system equipped with a converter lens according to an embodiment. [Figure 42] 42 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 41 when focused on infinity. [Figure 43] 42 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 41 when focusing on a close distance. [Figure 44] 42 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 41 when focused on infinity. [Figure 45] 42 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 41 when focusing on a close distance. [Figure 46] FIG. 10 is a lens cross-sectional view showing a sixth configuration example (Example 6) of an optical system equipped with a converter lens according to an embodiment. [Figure 47]FIG. 47 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 46 when focused on infinity. [Figure 48] 47 is an aberration diagram showing longitudinal aberration of the optical system shown in FIG. 46 when focusing on a close distance. [Figure 49] FIG. 47 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 46 when focused on infinity. [Figure 50] 47 is an aberration diagram showing lateral aberration of the optical system shown in FIG. 46 when focusing on a close distance. [Figure 51] 1 is a lens cross-sectional view showing an example of a master lens to which a converter lens according to an embodiment is attached. FIG. [Figure 52] FIG. 52 is an aberration diagram showing longitudinal aberration of the master lens shown in FIG. 51 when focused on infinity. [Figure 53] FIG. 52 is an aberration diagram showing longitudinal aberration of the master lens shown in FIG. 51 when focusing on a close distance. [Figure 54] FIG. 52 is an aberration diagram showing lateral aberration of the master lens shown in FIG. 51 when focused on infinity. [Figure 55] 52 is an aberration diagram showing lateral aberration of the master lens shown in FIG. 51 when focusing on a close distance. [Figure 56] FIG. 1 is a block diagram illustrating an example of the configuration of an imaging device. [Figure 57] 1 is a block diagram showing an example of a schematic configuration of a vehicle control system; [Figure 58] FIG. 2 is an explanatory diagram showing an example of the installation positions of an outside-vehicle information detection unit and an imaging unit. [Figure 59] FIG. 1 is a diagram illustrating an example of a schematic configuration of an endoscope system. [Figure 60] FIG. 60 is a block diagram showing an example of the functional configuration of the camera and CCU shown in FIG. 59. [Figure 61] FIG. 1 is a diagram illustrating an example of a schematic configuration of a microsurgery system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 0. Comparative Example 1. Basic lens structure 2. Action and Effects 3. Application example to imaging devices 4. Numerical examples of lenses 5. Application Examples 6. Other embodiments

[0011] <0. Comparative Example> In order to reduce the overall length of a master lens when a re-imaging converter lens is attached, the position of the lens closest to the object in the converter lens is important. In the configurations proposed in Patent Documents 1 and 2, the position of the lens closest to the object in the converter lens is inappropriate, resulting in an increased overall length and making it difficult to accommodate lenses with long back focal lengths. Furthermore, in the configurations proposed in Patent Documents 1 and 2, the primary image point is located close to or inside the lenses that make up the converter lens, so image quality is significantly affected by defects inside the glass material of the lenses.

[0012] <1. Basic lens configuration> FIGS. 1 and 6 show a first example configuration of an optical system equipped with a converter lens CL according to an embodiment of the present disclosure, which corresponds to the configuration of Example 1 described below. FIG. 11 shows a second example configuration of an optical system equipped with a converter lens CL according to an embodiment, which corresponds to the configuration of Example 2 described below. FIGS. 16 and 21 show a third example configuration of an optical system equipped with a converter lens CL according to an embodiment, which corresponds to the configuration of Example 3 described below. FIGS. 26 and 31 show a fourth example configuration of an optical system equipped with a converter lens CL according to an embodiment, which corresponds to the configuration of Example 4 described below. FIGS. 36 and 41 show a fifth example configuration of an optical system equipped with a converter lens CL according to an embodiment, which corresponds to the configuration of Example 5 described below. FIG. 46 shows a sixth example configuration of an optical system equipped with a converter lens CL according to an embodiment, which corresponds to the configuration of Example 6 described below.

[0013] 1 and other figures, Z1 indicates the optical axis. An optical member such as a cover glass for protecting the imaging element may be disposed between the optical systems 1 to 6 equipped with the converter lenses CL according to the first to sixth configuration examples and the image plane. In addition to the cover glass, various optical filters such as a low-pass filter and an infrared cut filter may also be disposed as optical members.

[0014] Below, the configuration of the converter lens CL according to one embodiment of the present disclosure will be described in association with optical systems 1 to 6 equipped with converter lenses CL according to each configuration example shown in Figure 1, etc., as appropriate, but the technology according to the present disclosure is not limited to the configuration examples shown in the figures.

[0015] The converter lens CL according to one embodiment is a re-imaging converter lens that is arranged on the image plane side of the imaging optical system and re-images the image formed by the imaging optical system. Fig. 51 shows an example of the configuration of a master lens ML as an example of the imaging optical system. The optical systems 1 to 6 according to the respective configuration examples shown in Fig. 1 etc. have a converter lens CL according to one embodiment attached to the image plane side of the master lens ML shown in Fig. 51.

[0016] The converter lens CL according to one embodiment is arranged on the image plane side of the imaging optical system, and includes a plurality of lenses including at least one single lens or at least one cemented lens.

[0017] Converter lens CL according to one embodiment has, as its multiple lenses, lens L11 that is arranged closest to the object side within converter lens CL. Lens L11 is a first single lens or a first cemented lens.

[0018] In a converter lens CL according to one embodiment, the object-side surface of the lens L11 arranged closest to the object is arranged closer to the object than a primary image point P1 of the imaging optical system. Furthermore, the primary image point P1 exists outside the multiple lenses that make up the converter lens CL. In other words, the primary image point P1 is not located inside any of the lenses that make up the converter lens CL.

[0019] Additionally, the converter lens CL according to one embodiment may further satisfy certain conditional expressions, etc., which will be described later.

[0020] <2. Actions and Effects> Next, the operation and effects of the converter lens CL according to the embodiment of the present disclosure will be described, along with a more preferable configuration of the converter lens CL according to the embodiment of the present disclosure, and its operation and effects. The effects described in this specification are merely examples and are not limiting, and other effects may also be present.

[0021] The converter lens CL according to one embodiment has an optimized lens configuration that is small, versatile, and capable of achieving high image quality, making it possible to provide a converter lens CL that is small, versatile, and capable of achieving high image quality, and an imaging device that includes such a converter lens CL.

[0022] In a converter lens CL according to one embodiment, the object-side surface of the lens L11, which is located closest to the object in the converter lens CL, is positioned closer to the object than the primary image point P1, thereby shortening the overall length of the converter lens CL when attached to the master lens ML. Furthermore, by appropriately setting the distance by which the object-side surface of the lens L11 is positioned closer to the object than the primary image point P1, it is possible to prevent interference between the lens L11, which is located closest to the object in the master lens ML and has a short back focus, and the lens L11, which is located closest to the object in the converter lens CL. This makes it possible to attach the converter lens CL to the master lens ML regardless of the back focus length of the master lens ML.

[0023] Furthermore, by ensuring that the primary image point P1 is located outside the lenses that make up the converter lens CL and by maintaining the distance from the vertex of the lens surface that is closest to the primary image point P1 to the primary image point P1 at a certain value or greater, it is possible to prevent degradation of image quality due to defects inside the glass material of the lenses that make up the converter lens CL.

[0024] The converter lens CL according to one embodiment may satisfy the following conditional expressions (1) and (2). 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 ……(2) however, da: the distance from the vertex of the object side surface of the lens L11 (the first single lens or the first cemented lens) located closest to the object side in the converter lens CL to the primary image point P1 db: distance from the vertex of the object side of the lens L11 (first single lens or first cemented lens) located closest to the object side in the converter lens CL to the secondary image point P2 dc: The distance from the vertex of the lens surface closest to the primary image point P1 to the primary image point P1 Let's say.

[0025] Conditional formula (1) is a conditional formula for appropriately setting the distance by which the object-side surface of the lens L11, which is located closest to the object in the converter lens CL, is positioned closer to the object than the primary image point P1. This conditional formula allows for a reduction in the overall length, regardless of whether the converter lens CL can be attached or not, depending on the back focal length of the master lens ML. If the lower limit of conditional formula (1) is exceeded, the lens L11, which is located closest to the object in the converter lens CL, will be positioned closer to the image plane, which will increase the overall length when the converter lens CL is attached to the master lens ML. On the other hand, if the upper limit of conditional formula (1) is exceeded, the lens L11, which is located closest to the object in the converter lens CL, will be positioned closer to the object, which will make it difficult to attach the converter lens CL to a master lens ML with a short back focal length, reducing versatility.

[0026] Conditional expression (2) is a conditional expression for maintaining a certain distance from the vertex of the lens surface closest to the primary image point P1 to the primary image point P1. This conditional expression makes it possible to prevent image quality from being significantly affected by defects inside the glass material of the lenses that make up the converter lens CL. If the lower limit of conditional expression (2) is not met, the distance from the vertex of the lens surface closest to the primary image point P1 to the primary image point P1 becomes too short, making the converter lens CL more susceptible to defects inside the glass material of the lenses that make up the converter lens CL and apt to degrade image quality. On the other hand, if the upper limit of conditional expression (2) is exceeded, the distance from the vertex of the lens surface closest to the primary image point P1 to the primary image point P1 becomes too long, resulting in an increase in the overall size.

[0027] Furthermore, by setting the numerical ranges of conditional expressions (1) and (2) as in the following conditional expressions (1A) and (2A), even greater effects can be obtained. 0.03≦da / db≦0.17……(1A) 0.01≦dc / db≦0.15 ……(2A)

[0028] Moreover, the converter lens CL according to one embodiment may satisfy the following conditional expression (3). -5.0≦db / f1≦5.0 ……(3) however, f1: The focal length of the lens group of the converter lens CL located closer to the object than the first-order image point P1 Let's say.

[0029] Conditional expression (3) is a conditional expression for appropriately setting the focal length of the lens group of converter lens CL, which is arranged closer to the object than primary image point P1. This conditional expression prevents the spread of peripheral rays up to primary image point P1, allowing the converter lens CL to be made compact in the radial direction. If the lower limit of conditional expression (3) is exceeded, the peripheral rays up to primary image point P1 will spread, making it difficult to make the converter lens CL compact. On the other hand, if the upper limit of conditional expression (3) is exceeded, the power of the lens group of converter lens CL, which is arranged closer to the object than primary image point P1, will become so strong that aberration correction will become difficult.

[0030] Furthermore, by setting the numerical range of conditional expression (3) as in the following conditional expression (3A), a better effect can be obtained. -3.0≦db / f1≦3.0 ……(3A)

[0031] Furthermore, the converter lens CL according to one embodiment may further include, as the plurality of lenses, a lens L21 arranged immediately behind the primary image point P1, and may satisfy the following conditional expression (4): The lens L21 arranged immediately behind the primary image point P1 is a second single lens or a second cemented lens. 0.01≦f2 / db≦5.0 ……(4) however, f2: focal length of lens L21 (second single lens or second cemented lens) located immediately after the primary image point P1 Let's say.

[0032] By satisfying conditional expression (4), the lens L21 located immediately behind the primary image point P1 has an appropriate positive refractive power, which suppresses the spread of peripheral rays behind the primary image point P1 and is advantageous for achieving compactness in the radial direction. If the conditional expression (4) is not satisfied, it will be disadvantageous for compactness.

[0033] Furthermore, by setting the numerical range of conditional expression (4) as in the following conditional expression (4A), a better effect can be obtained. 0.1≦f2 / db≦3.0 ……(4A)

[0034] Moreover, the converter lens CL according to one embodiment may satisfy the following conditional expression (4). -1.0≦f3 / db≦-0.01 ……(5) however, f3: The focal length of the lens located closest to the image plane in the converter lens CL Let's say.

[0035] By satisfying conditional expression (5), the lens in front of the mount to which the converter lens CL is attached has an appropriate negative refractive power, resulting in a configuration that is advantageous for reducing the mount diameter. If the conditional expression (5) is not satisfied, it will be disadvantageous for reducing the mount diameter.

[0036] Furthermore, by setting the numerical range of conditional expression (5) to the following conditional expression (5A), a better effect can be obtained. -0.7≦f3 / db≦-0.1 ……(5A)

[0037] Furthermore, in the converter lens CL according to one embodiment, an aperture stop St may be disposed within the converter lens CL. Then, when the converter lens CL is attached to the imaging optical system, the F-number may be changed (adjusted) by the aperture stop St within the converter lens CL. This makes it possible to design the converter lens CL so that the chief ray of the converter lens CL falls within the range of angles at which multiple marginal rays incident on the converter lens CL from the master lens ML overlap, resulting in a configuration advantageous for reducing the radial size of the converter lens CL.

[0038] Furthermore, the converter lens CL according to one embodiment may be configured as a so-called anamorphic lens, in which the focal length in the vertical direction (vertical cross-sectional direction) is different from the focal length in the horizontal direction (horizontal cross-sectional direction). This allows the focal length to be changed between the vertical and horizontal directions, and light rays to be efficiently condensed using a conversion magnification of an arbitrary aspect ratio, thereby making effective use of the image sensor surface of the imaging device to which the converter lens CL is attached. Note that the converter lenses CL shown in Examples 1, 3 to 5 described below have an anamorphic lens configuration.

[0039] <3. Application example to imaging device> Next, a specific example of application of the converter lens CL according to an embodiment of the present disclosure to an imaging device will be described.

[0040] 56 shows an example of the configuration of an imaging device 100 to which a converter lens CL according to one embodiment is applied. This imaging device 100 is, for example, a digital still camera, and includes a camera block 110, a camera signal processing unit 20, an image processing unit 30, an LCD (Liquid Crystal Display) 40, an R / W (Reader / Writer) 50, a CPU (Central Processing Unit) 60, an input unit 70, and a lens drive control unit 80.

[0041] The camera block 110 has an imaging function and includes an imaging lens 111 and an imaging element 112 such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The imaging element 112 converts an optical image formed by the imaging lens 111 into an electrical signal, and outputs an imaging signal (image signal) corresponding to the optical image. The imaging lens 111 can be any of the optical systems 1 to 6 equipped with a converter lens CL according to each of the configuration examples shown in FIG. 1 etc.

[0042] The camera signal processing unit 20 performs various signal processing on the image signal output from the image sensor 112, such as analog-to-digital conversion, noise removal, image quality correction, and conversion into luminance and color difference signals.

[0043] The image processing unit 30 performs recording and playback processing of image signals, and performs compression, encoding, decompression and decoding processing of image signals based on a predetermined image data format, as well as conversion processing of data specifications such as resolution.

[0044] The LCD 40 has a function of displaying various data such as the operation status of the user on the input unit 70 and captured images. The R / W 50 writes image data encoded by the image processing unit 30 to the memory card 1000 and reads image data recorded on the memory card 1000. The memory card 1000 is, for example, a semiconductor memory that is detachable from a slot connected to the R / W 50.

[0045] The CPU 60 functions as a control processing unit that controls each circuit block provided in the imaging device 100, and controls each circuit block based on instruction input signals and the like from the input unit 70. The input unit 70 is made up of various switches and the like that are operated as required by the user. The input unit 70 is composed of, for example, a shutter release button for operating the shutter and a selection switch for selecting an operation mode, and is configured to output instruction input signals to the CPU 60 in response to user operations. The lens drive control unit 80 controls the drive of the lenses arranged in the camera block 110, and is configured to control motors and the like (not shown) that drive each lens of the imaging lens 111 based on control signals from the CPU 60.

[0046] The operation of the imaging device 100 will be described below. In a standby state for photographing, under the control of the CPU 60, an image signal corresponding to an image photographed by the camera block 110 is output to the LCD 40 via the camera signal processing unit 20 and displayed as a camera-through image. Furthermore, when an instruction input signal for zooming or focusing is input from the input unit 70, for example, the CPU 60 outputs a control signal to the lens drive control unit 80, and a predetermined lens of the imaging lens 111 moves under the control of the lens drive control unit 80.

[0047] When a shutter (not shown) of the camera block 110 is operated by an instruction input signal from the input unit 70, the captured image signal is output from the camera signal processing unit 20 to the image processing unit 30, where it is compressed and encoded and converted into digital data in a predetermined data format. The converted data is output to the R / W 50 and written to the memory card 1000.

[0048] Focusing is performed by the lens drive control unit 80 moving a predetermined lens of the imaging lens 111 based on a control signal from the CPU 60, for example, when the shutter release button on the input unit 70 is pressed halfway or fully pressed for recording (photographing).

[0049] When reproducing image data recorded on the memory card 1000, the R / W 50 reads out the specified image data from the memory card 1000 in response to an operation on the input unit 70, and the image processing unit 30 performs an expansion / decoding process. After that, the reproduced image signal is output to the LCD 40, and the reproduced image is displayed.

[0050] Although the above-described embodiment shows an example in which the imaging device is applied to a digital still camera, the application range of the imaging device is not limited to digital still cameras and can be applied to various other imaging devices. For example, the imaging device can be applied to digital single-lens reflex cameras, digital non-reflex cameras, digital video cameras, surveillance cameras, etc. Furthermore, the imaging device can be widely used as a camera unit of digital input / output devices such as mobile phones with built-in cameras and information terminals with built-in cameras. Furthermore, the imaging device can be applied to cameras with interchangeable lenses. [Example]

[0051] <4. Numerical examples of lenses> Next, specific numerical examples of optical systems equipped with a converter lens CL according to an embodiment of the present disclosure will be described. Here, examples will be described in which specific numerical values ​​are applied to optical systems 1 to 6 equipped with a converter lens CL according to each of the configuration examples shown in FIG. 1 etc.

[0052] The meanings of symbols used in the following tables and explanations are as follows: "Si" indicates the number of the i-th surface, with the symbols increasing sequentially from the surface closest to the object. "rYi" indicates the value (mm) of the paraxial radius of curvature of the i-th surface in the vertical cross-sectional direction (YZ cross-sectional direction). "rXi" indicates the value (mm) of the paraxial radius of curvature of the i-th surface in the horizontal cross-sectional direction (XZ cross-sectional direction). When the vertical cross-sectional direction and the horizontal cross-sectional direction have the same shape, the value (mm) of the paraxial radius of curvature of the i-th surface is indicated as "ri". "di" indicates the value (mm) of the distance on the optical axis between the i-th surface and the (i+1)-th surface. "ndi" indicates the value of the refractive index at the d-line (wavelength 587.6 nm) of the material of the optical element that comprises the i-th surface. "νdi" indicates the value of the Abbe number at the d-line of the material of the optical element that comprises the i-th surface. "φi" indicates the value (mm) of the clear aperture of the i-th surface. The "∞" values ​​for "ri", "rYi", and "rXi" indicate a flat surface or an aperture surface. "ASP" in the surface number (Si) column indicates that the surface in question is an aspherical surface. "STO" in the surface number column indicates that the aperture diaphragm St is located at the corresponding position. "OBJ" in the surface number column indicates that the surface in question is the object surface (subject surface). "IMG" in the surface number column indicates that the surface in question is the image surface. "f" indicates the focal length of the entire system (unit: mm). "Fno" indicates the maximum aperture (F-number). "ω" indicates the half angle of view (unit: °). "Y" indicates the image height (unit: mm). "L" indicates the total optical length (the distance on the optical axis from the surface closest to the object to the image surface IMG) (unit: mm).

[0053] Furthermore, some of the lenses used in the examples have aspherical lens surfaces. The aspherical shape is defined by the following formula. In the tables showing the aspherical coefficients described later, "Ei" is an exponential expression with the base 10, that is, "10 -i " For example, "0.12345E-05" represents "0.12345 x 10 -5 " represents.

[0054] (Aspherical formula) x=c 2 y2 / (1+(1-(1+k)c 2 y 2 ) 1 / 2 )+A4·y 4 +A6·y 6 +A8·y 8 +A10·y 10 +A12·y 12 Here, the distance from the vertex of the lens surface along the optical axis (sag) is "x," the height in the direction perpendicular to the optical axis is "y," the paraxial curvature at the vertex of the lens surface (the reciprocal of the radius of curvature) is "c," and the conic constant is "k." A4, A6, A8, A10, and A12 are the 4th-, 6th-, 8th-, 10th-, and 12th-order aspheric coefficients, respectively.

[0055] [Numerical example of master lens] [Table 1] shows the basic lens data for the master lens ML shown in Figure 51. [Table 2] shows the values ​​of the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system of the master lens ML. [Table 3] shows data on surface spacings that are variable during focusing in the master lens ML. [Table 2] shows values ​​when the object distance (d0) is infinity. [Table 3] shows values ​​when the object distance (d0) is infinity and when it is close. [Table 4] shows values ​​of coefficients that represent the shape of the aspherical surface in the master lens ML. [Table 5] shows the first surface and focal length (unit: mm) of each lens group in the master lens ML.

[0056] The master lens ML is configured such that a first lens group MG1 to a third lens group MG3 are arranged in this order from the object side to the image plane side, and an aperture stop St is arranged between the first lens group MG1 and the second lens group MG2.

[0057] The first lens group MG1 consists of, in order from the object side to the image plane side, a negative meniscus lens ML11 with its convex surface facing the object side, a negative meniscus lens ML12 with its convex surface facing the object side, a positive lens ML13 made of a cemented lens, a negative lens ML14 made of a cemented lens, and a positive lens ML15.

[0058] The second lens group MG2 is composed of, in order from the object side to the image plane side, a positive lens ML21, a negative lens ML22 made of a cemented lens, a positive lens ML23, a negative lens ML24, and a negative lens ML25.

[0059] The third lens group MG3 is made up of a positive lens element ML26.

[0060] During focusing, in which the object distance changes from infinity to a close distance, the second lens group MG2 (surfaces 15 to 25) moves in the optical axis direction.

[0061] [Table 1]

[0062] [Table 2]

[0063] [Table 3]

[0064] [Table 4]

[0065] [Table 5]

[0066] Fig. 52 shows the longitudinal aberration of the master lens ML shown in Fig. 51 when focusing at infinity. Fig. 53 shows the longitudinal aberration of the master lens ML shown in Fig. 51 when focusing at a close distance. Fig. 54 shows the lateral aberration of the master lens ML shown in Fig. 51 when focusing at infinity. Fig. 55 shows the lateral aberration of the master lens ML shown in Fig. 51 when focusing at a close distance.

[0067] Figures 52 and 53 show longitudinal aberrations, including spherical aberration, astigmatism (field curvature), and distortion. In the spherical aberration diagrams in Figures 52 and 53 and the lateral aberration diagrams in Figures 54 and 55, the solid line indicates values ​​at the d-line (587.56 nm), the dashed-dotted line indicates values ​​at the g-line (435.84 nm), and the dashed line indicates values ​​at the C-line (656.27 nm). In the astigmatism diagrams in Figures 52 and 53, T indicates values ​​at the sagittal image plane, and S indicates values ​​at the tangential image plane. The astigmatism diagrams and distortion diagrams in Figures 52 and 53 show values ​​at the d-line.

[0068] [Numerical example of an optical system equipped with a converter lens CL] The following Examples 1 to 6 are numerical examples of optical systems 1 to 6 in which a converter lens CL is attached to the master lens ML shown in Fig. 51. In the numerical data (such as Table 6) showing Examples 1 to 6 below, surfaces 1 to 27 are the same as surfaces 1 to 27 of the master lens ML shown in Tables 1 to 5 above, and therefore the numerical values ​​are omitted as appropriate in the lens data. In the numerical data (such as Table 6) showing Examples 1 to 6 below, surfaces 28 and beyond are numerical data showing the converter lens CL.

[0069] In the optical systems 1 to 6 equipped with the converter lens CL described below, the second lens group MG2 (surfaces 15 to 25) of the master lens ML moves in the optical axis direction during focusing.

[0070] In the optical systems 1 to 6 shown below, which are equipped with a converter lens CL, an aperture stop St is disposed within the converter lens CL. In the optical systems 1 to 6, when the converter lens CL is attached to the master lens ML, the F-number is changed (adjusted) by the aperture stop St within the converter lens CL.

[0071] [Example 1] Fig. 1 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) of an optical system 1 equipped with a converter lens CL according to Example 1. Fig. 6 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) of an optical system 1 equipped with a converter lens CL according to Example 1.

[0072] Table 6 shows basic lens data for the optical system 1 equipped with the converter lens CL according to Example 1 shown in FIGS. 1 and 6. Table 7 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 1 equipped with the converter lens CL according to Example 1. Table 8 shows data on surface spacings that are variable during focusing in the optical system 1 equipped with the converter lens CL according to Example 1. Table 7 shows values ​​when the object distance (d0) is infinity. Table 8 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 9 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 1 equipped with the converter lens CL according to Example 1. Table 10 shows the first surface and focal length (unit: mm) of each lens group in the optical system 1 equipped with the converter lens CL according to Example 1.

[0073] The optical system 1 equipped with the converter lens CL of Example 1 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0074] The lens group located closer to the object side than the primary image point P1 is made up of a cemented lens L11. Lens L11 is a positive meniscus lens with its convex surface facing the object side.

[0075] The lens group arranged on the image side of the primary image point P1 and on the object side of the aperture stop St consists of, in order from the object side to the image side, lenses L21 to L30. Lens L21 is a positive meniscus lens with its concave surface facing the object side. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lens L23 is a positive lens. Lens L24 is a toroidal lens. Lens L25 is a negative meniscus lens with its concave surface facing the object side. Lens L26 is a cemented lens and is a negative meniscus lens with its concave surface facing the object side. Lens L27 is a positive lens. Lens L28 is a toroidal lens. Lens L29 is a positive lens. Lens L30 is a toroidal lens.

[0076] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative lens.

[0077] The above configuration makes it compact, versatile, and achieves high image quality.

[0078] [Table 6]

[0079] [Table 7]

[0080] [Table 8]

[0081] [Table 9]

[0082] [Table 10]

[0083] FIG. 2 shows the longitudinal aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 1 when focusing at infinity. FIG. 3 shows the longitudinal aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 1 when focusing at close range. FIG. 4 shows the lateral aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 1 when focusing at infinity. FIG. 5 shows the lateral aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 1 when focusing at close range. FIG. 7 shows the longitudinal aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 6 when focusing at infinity. FIG. 8 shows the longitudinal aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 6 when focusing at close range. FIG. 9 shows the lateral aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 6 when focusing at infinity. FIG. 10 shows the lateral aberration of the optical system 1 equipped with the converter lens CL shown in FIG. 6 when focusing at close range.

[0084] Figures 2, 3, 7, and 8 show longitudinal aberrations, including spherical aberration, astigmatism (field curvature), and distortion. In the spherical aberration diagrams in Figures 2, 3, 7, and 8, and the lateral aberration diagrams in Figures 4, 5, 9, and 10, the solid line indicates values ​​at the d-line (587.56 nm), the dashed-dotted line indicates values ​​at the g-line (435.84 nm), and the dashed line indicates values ​​at the C-line (656.27 nm). In the astigmatism diagrams in Figures 2, 3, 7, and 8, X indicates values ​​corresponding to the sagittal image plane, and Y indicates values ​​corresponding to the tangential image plane. In the astigmatism diagrams and distortion diagrams in Figures 2, 3, 7, and 8, values ​​at the d-line are shown. The same applies to the aberration diagrams in the following Examples 3 to 5.

[0085] As can be seen from each aberration diagram, the optical system 1 equipped with the converter lens CL according to Example 1 has excellent correction of various aberrations and has excellent imaging performance.

[0086] [Example 2] FIG. 11 is a cross-sectional view of an optical system 2 equipped with a converter lens CL according to the second embodiment.

[0087] Table 11 shows basic lens data for the optical system 2 equipped with the converter lens CL according to Example 2 shown in FIG. 11. Table 12 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 2 equipped with the converter lens CL according to Example 2. Table 13 shows data on surface spacings that are variable during focusing in the optical system 2 equipped with the converter lens CL according to Example 2. Table 12 shows values ​​when the object distance (d0) is infinity. Table 13 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 14 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 2 equipped with the converter lens CL according to Example 2. Table 15 shows the first surface and focal length (unit: mm) of each lens group in the optical system 2 equipped with the converter lens CL according to Example 2.

[0088] The optical system 2 equipped with the converter lens CL of Example 2 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0089] The lens group located closer to the object side than the primary image point P1 is made up of a single lens L11. Lens L11 is a positive meniscus lens with its convex surface facing the object side.

[0090] The lens group arranged on the image side of the primary image point P1 and on the object side of the aperture stop St consists of, in order from the object side to the image side, lenses L21 to L29. Lens L21 is a cemented lens and is a positive lens. Lens L22 is a negative meniscus lens with a concave surface facing the object side. Lens L23 is a positive lens. Lens L24 is a positive meniscus lens with a convex surface facing the object side. Lens L25 is a positive meniscus lens with a concave surface facing the object side. Lens L26 is a cemented lens and is a negative lens. Lens L27 is a negative meniscus lens with a concave surface facing the object side. Lens L28 is a positive meniscus lens with a convex surface facing the object side. Lens L29 is a positive lens.

[0091] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative lens.

[0092] The above configuration makes it compact, versatile, and achieves high image quality.

[0093] [Table 11]

[0094] [Table 12]

[0095] [Table 13]

[0096] [Table 14]

[0097] [Table 15]

[0098] Fig. 12 shows the longitudinal aberration of optical system 2 equipped with converter lens CL shown in Fig. 11 when focusing at infinity. Fig. 13 shows the longitudinal aberration of optical system 2 equipped with converter lens CL shown in Fig. 11 when focusing at close range. Fig. 14 shows the lateral aberration of optical system 2 equipped with converter lens CL shown in Fig. 11 when focusing at infinity. Fig. 15 shows the lateral aberration of optical system 2 equipped with converter lens CL shown in Fig. 11 when focusing at close range.

[0099] Figures 12 and 13 show longitudinal aberrations, including spherical aberration, astigmatism (field curvature), and distortion. In the spherical aberration diagrams in Figures 12 and 13 and the lateral aberration diagrams in Figures 14 and 15, the solid line indicates values ​​at the d-line (587.56 nm), the dashed-dotted line indicates values ​​at the g-line (435.84 nm), and the dashed line indicates values ​​at the C-line (656.27 nm). In the astigmatism diagrams in Figures 12 and 13, T indicates values ​​at the sagittal image plane, and S indicates values ​​at the tangential image plane. The astigmatism diagrams and distortion diagrams in Figures 12 and 13 show values ​​at the d-line. The same applies to the aberration diagrams in the following Example 6.

[0100] As can be seen from each aberration diagram, the optical system 2 equipped with the converter lens CL according to Example 2 has excellent correction of various aberrations and has excellent imaging performance.

[0101] [Example 3] Fig. 16 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) of an optical system 3 equipped with a converter lens CL according to Example 3. Fig. 21 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) of an optical system 3 equipped with a converter lens CL according to Example 3.

[0102] Table 16 shows basic lens data for the optical system 3 equipped with the converter lens CL according to Example 3 shown in FIGS. 16 and 21. Table 17 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 3 equipped with the converter lens CL according to Example 3. Table 18 shows data on surface spacings that become variable during focusing in the optical system 3 equipped with the converter lens CL according to Example 3. Table 17 shows values ​​when the object distance (d0) is infinity. Table 18 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 19 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 3 equipped with the converter lens CL according to Example 3. Table 20 shows the first surface and focal length (unit: mm) of each lens group in the optical system 3 equipped with the converter lens CL according to Example 3.

[0103] The optical system 3 equipped with the converter lens CL of Example 3 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0104] The lens group located closer to the object side than the primary image point P1 is made up of a cemented lens L11. Lens L11 is a positive meniscus lens with its convex surface facing the object side.

[0105] The lens group arranged on the image side of the primary image point P1 and on the object side of the aperture stop St consists of, in order from the object side to the image side, lenses L21 to L29. Lens L21 is a positive meniscus lens with its concave surface facing the object side. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lens L23 is a positive lens. Lens L24 is a cylindrical lens. Lens L25 is a negative meniscus lens with its concave surface facing the object side. Lens L26 is a cemented lens and is a negative meniscus lens with its concave surface facing the object side. Lens L27 is a negative meniscus lens with its concave surface facing the object side. Lens L28 is a cylindrical lens. Lens L29 is a positive lens.

[0106] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative lens.

[0107] The above configuration makes it compact, versatile, and achieves high image quality.

[0108] [Table 16]

[0109] [Table 17]

[0110] [Table 18]

[0111] [Table 19]

[0112] [Table 20]

[0113] FIG. 17 shows the longitudinal aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 16 when focusing at infinity. FIG. 18 shows the longitudinal aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 16 when focusing at a close distance. FIG. 19 shows the lateral aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 16 when focusing at infinity. FIG. 20 shows the lateral aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 16 when focusing at a close distance. FIG. 22 shows the longitudinal aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 21 when focusing at infinity. FIG. 23 shows the longitudinal aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 21 when focusing at a close distance. FIG. 24 shows the lateral aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 21 when focusing at infinity. FIG. 25 shows the lateral aberration of the optical system 3 equipped with the converter lens CL shown in FIG. 21 when focusing at a close distance.

[0114] As can be seen from each aberration diagram, the optical system 3 equipped with the converter lens CL according to Example 3 has excellent correction of various aberrations and has excellent imaging performance.

[0115] [Example 4] Fig. 26 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) of an optical system 4 equipped with a converter lens CL according to Example 4. Fig. 31 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) of an optical system 4 equipped with a converter lens CL according to Example 4.

[0116] Table 21 shows basic lens data for the optical system 4 equipped with the converter lens CL according to Example 4 shown in FIGS. 26 and 31. Table 22 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 4 equipped with the converter lens CL according to Example 4. Table 23 shows data on surface spacings that are variable during focusing in the optical system 4 equipped with the converter lens CL according to Example 4. Table 22 shows values ​​when the object distance (d0) is infinity. Table 23 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 24 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 4 equipped with the converter lens CL according to Example 4. Table 25 shows the first surface and focal length (unit: mm) of each lens group in the optical system 4 equipped with the converter lens CL according to Example 4.

[0117] The optical system 4 equipped with the converter lens CL of Example 4 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0118] The lens group located closer to the object side than the primary image point P1 consists, in order from the object side to the image plane side, of lens L11, which is made up of a single lens, and lens L12. Lens L11 is a positive meniscus lens with its convex surface facing the object side. Lens L12 is a negative meniscus lens with its convex surface facing the object side.

[0119] The lens group arranged on the image side of the primary image formation point P1 and on the object side of the aperture stop St consists of, in order from the object side to the image side, lenses L21 to L30. Lens L21 is a positive meniscus lens with its concave surface facing the object side. Lens L22 is a negative lens. Lens L23 is a positive lens. Lens L24 is a cylindrical lens. Lens L25 is a negative meniscus lens with its concave surface facing the object side. Lens L26 is a cemented lens and is a positive meniscus lens with its concave surface facing the object side. Lens L27 is a positive lens. Lens L28 is a cylindrical lens. Lens L29 is a positive lens. Lens L30 is a cylindrical lens.

[0120] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative meniscus lens with its concave surface facing the object side.

[0121] The above configuration makes it compact, versatile, and achieves high image quality.

[0122] [Table 21]

[0123] [Table 22]

[0124] [Table 23]

[0125] [Table 24]

[0126] [Table 25]

[0127] FIG. 27 shows the longitudinal aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 26 when focusing at infinity. FIG. 28 shows the longitudinal aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 26 when focusing at a close distance. FIG. 29 shows the lateral aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 26 when focusing at infinity. FIG. 30 shows the lateral aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 26 when focusing at a close distance. FIG. 32 shows the longitudinal aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 23 when focusing at infinity. FIG. 33 shows the longitudinal aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 23 when focusing at a close distance. FIG. 34 shows the lateral aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 23 when focusing at infinity. FIG. 35 shows the lateral aberration of the optical system 4 equipped with the converter lens CL shown in FIG. 23 when focusing at a close distance.

[0128] As can be seen from each aberration diagram, the optical system 4 equipped with the converter lens CL according to Example 4 has excellent correction of various aberrations and has excellent imaging performance.

[0129] [Example 5] Fig. 36 is a lens cross-sectional view in a vertical cross-sectional direction (YZ cross-sectional direction) of an optical system 5 equipped with a converter lens CL according to Example 5. Fig. 41 is a lens cross-sectional view in a horizontal cross-sectional direction (XZ cross-sectional direction) of an optical system 5 equipped with a converter lens CL according to Example 5.

[0130] Table 26 shows basic lens data for the optical system 5 equipped with the converter lens CL according to Example 5 shown in FIGS. 36 and 41. Table 27 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 5 equipped with the converter lens CL according to Example 5. Table 28 shows data on surface spacings that are variable during focusing in the optical system 5 equipped with the converter lens CL according to Example 5. Table 27 shows values ​​when the object distance (d0) is infinity. Table 28 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 29 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 5 equipped with the converter lens CL according to Example 5. Table 30 shows the first surface and focal length (unit: mm) of each lens group in the optical system 5 equipped with the converter lens CL according to Example 5.

[0131] The optical system 5 equipped with the converter lens CL of Example 5 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0132] The lens group located closer to the object side than the primary image point P1 is made up of a cemented lens L11. Lens L11 is a positive meniscus lens with its convex surface facing the object side.

[0133] The lens group arranged closer to the image plane than the primary image point P1 and closer to the object plane than the aperture stop St consists of, in order from the object plane to the image plane, lenses L21 to L30. Lens L21 is a positive lens. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lens L23 is a positive lens. Lens L24 is a cylindrical lens. Lens L25 is a positive meniscus lens with its concave surface facing the object side. Lens L26 is a cemented lens and is a negative meniscus lens with its concave surface facing the object side. Lens L27 is a positive lens. Lens L28 is a cylindrical lens. Lens L29 is a positive lens. Lens L30 is a cylindrical lens.

[0134] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative lens.

[0135] The above configuration makes it compact, versatile, and achieves high image quality.

[0136] [Table 26]

[0137] [Table 27]

[0138] [Table 28]

[0139] [Table 29]

[0140] [Table 30]

[0141] FIG. 37 shows the longitudinal aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 36 when focusing at infinity. FIG. 38 shows the longitudinal aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 36 when focusing at a close distance. FIG. 39 shows the lateral aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 36 when focusing at infinity. FIG. 40 shows the lateral aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 36 when focusing at a close distance. FIG. 42 shows the longitudinal aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 41 when focusing at infinity. FIG. 43 shows the longitudinal aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 41 when focusing at a close distance. FIG. 44 shows the lateral aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 41 when focusing at infinity. FIG. 45 shows the lateral aberration of the optical system 5 equipped with the converter lens CL shown in FIG. 41 when focusing at a close distance.

[0142] As can be seen from each aberration diagram, the optical system 5 equipped with the converter lens CL according to Example 5 has excellent correction of various aberrations and has excellent imaging performance.

[0143] [Example 6] FIG. 46 is a cross-sectional view of an optical system 6 equipped with a converter lens CL according to Example 6.

[0144] Table 31 shows basic lens data for the optical system 6 equipped with the converter lens CL according to Example 6 shown in FIG. 46. Table 32 shows the focal length f, F-number, total angle of view 2ω, image height Y, and total optical length L of the entire system in the optical system 6 equipped with the converter lens CL according to Example 6. Table 33 shows data on surface spacings that are variable during focusing in the optical system 6 equipped with the converter lens CL according to Example 6. Table 32 shows values ​​when the object distance (d0) is infinity. Table 33 shows values ​​when the object distance (d0) is infinity and when the object distance (d0) is close. Table 34 shows values ​​of coefficients that represent the shape of the aspherical surface in the optical system 6 equipped with the converter lens CL according to Example 6. Table 35 shows the first surface and focal length (unit: mm) of each lens group in the optical system 6 equipped with the converter lens CL according to Example 6.

[0145] The optical system 6 equipped with the converter lens CL of Example 6 comprises, in order from the object side to the image plane side, a lens group arranged on the object side of the primary image point P1, a lens group arranged on the image plane side of the primary image point P1 and on the object side of the aperture stop St, and a lens group arranged on the image plane side of the aperture stop St.

[0146] The lens group arranged closer to the object side than the primary image point P1 is made up of a single lens L11. The lens L11 is a positive lens.

[0147] The lens group arranged closer to the image plane than the primary image point P1 and closer to the object plane than the aperture stop St consists of, in order from the object plane to the image plane, lenses L21 to L30. Lens L21 is a positive meniscus lens with its concave surface facing the object side. Lens L22 is a negative meniscus lens with its concave surface facing the object side. Lens L23 is a positive lens. Lens L24 is a positive lens. Lens L25 is a positive meniscus lens with its concave surface facing the object side. Lens L26 is a cemented lens and is a negative meniscus lens with its concave surface facing the object side. Lens L27 is a positive lens. Lens L28 is a negative meniscus lens with its convex surface facing the object side. Lens L29 is a positive meniscus lens with its convex surface facing the object side. Lens L30 is a positive lens.

[0148] The lens group arranged closer to the image plane than the aperture stop St consists of, in order from the object side to the image plane side, lenses L31 to L34. Lens L31 is a positive meniscus lens with its convex surface facing the object side. Lens L32 is a negative lens. Lens L33 is a positive lens. Lens L34 is a negative lens.

[0149] The above configuration makes it compact, versatile, and achieves high image quality.

[0150] [Table 31]

[0151] [Table 32]

[0152] [Table 33]

[0153] [Table 34]

[0154] [Table 35]

[0155] Fig. 47 shows the longitudinal aberration of optical system 6 equipped with converter lens CL shown in Fig. 46 when focusing at infinity. Fig. 48 shows the longitudinal aberration of optical system 6 equipped with converter lens CL shown in Fig. 46 when focusing at close range. Fig. 49 shows the lateral aberration of optical system 6 equipped with converter lens CL shown in Fig. 46 when focusing at infinity. Fig. 50 shows the lateral aberration of optical system 6 equipped with converter lens CL shown in Fig. 46 when focusing at close range.

[0156] As can be seen from each aberration diagram, the optical system 6 equipped with the converter lens CL according to Example 6 has excellent correction of various aberrations and has excellent imaging performance.

[0157] [Other numerical data for each example] Table 36 shows the values ​​for each of the above conditional expressions for each example. As can be seen from Table 36, the values ​​for each example fall within the numerical range for each conditional expression.

[0158] [Table 36]

[0159] <5. Application Examples> [5.1 First application example] The technology according to the present disclosure 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 moving body, such as an automobile, an electric vehicle, a hybrid electric vehicle, a motorcycle, a bicycle, a personal mobility device, an airplane, a drone, a ship, a robot, a construction machine, or an agricultural machine (tractor).

[0160] 57 is a block diagram showing a schematic configuration example of a vehicle control system 7000, which is an example of a mobile object control system to which the technology according to the present disclosure can be applied. The vehicle control system 7000 includes a plurality of electronic control units connected via a communication network 7010. In the example shown in FIG. 57, the vehicle control system 7000 includes a drive system control unit 7100, a body system control unit 7200, a battery control unit 7300, an outside-vehicle information detection unit 7400, an inside-vehicle information detection unit 7500, and an integrated control unit 7600. The communication network 7010 connecting these multiple control units may be an in-vehicle communication network conforming to any standard, such as a Controller Area Network (CAN), a Local Interconnect Network (LIN), a Local Area Network (LAN), or FlexRay (registered trademark).

[0161] Each control unit includes a microcomputer that performs arithmetic processing according to various programs, a memory unit that stores the programs executed by the microcomputer or parameters used in various calculations, and a drive circuit that drives various devices to be controlled. Each control unit includes a network I / F for communicating with other control units via a communication network 7010, and a communication I / F for communicating with devices or sensors inside and outside the vehicle via wired or wireless communication. Figure 57 illustrates the functional configuration of the integrated control unit 7600, including a microcomputer 7610, a general-purpose communication I / F 7620, a dedicated communication I / F 7630, a positioning unit 7640, a beacon receiving unit 7650, an in-vehicle device I / F 7660, an audio / video output unit 7670, an in-vehicle network I / F 7680, and a memory unit 7690. Similarly, the other control units also include a microcomputer, a communication I / F, a memory unit, and the like.

[0162] The drivetrain control unit 7100 controls the operation of devices related to the drivetrain of the vehicle in accordance with various programs. For example, the drivetrain control unit 7100 functions as a control device for a driving force generating device for generating driving force for the vehicle, such as an internal combustion engine or a drive motor, a driving force transmission mechanism for transmitting driving force to the wheels, a steering mechanism for adjusting the steering angle of the vehicle, and a braking device for generating braking force for the vehicle. The drivetrain control unit 7100 may also function as a control device for an ABS (Antilock Brake System) or an ESC (Electronic Stability Control), etc.

[0163] A vehicle state detection unit 7110 is connected to the drivetrain control unit 7100. The vehicle state detection unit 7110 includes at least one of a gyro sensor that detects the angular velocity of the axial rotational motion of the vehicle body, an acceleration sensor that detects the acceleration of the vehicle, or a sensor that detects the amount of operation of the accelerator pedal, the amount of operation of the brake pedal, the steering angle of the steering wheel, the engine rotation speed, the rotation speed of the wheels, etc. The drivetrain control unit 7100 performs arithmetic processing using signals input from the vehicle state detection unit 7110, and controls the internal combustion engine, the drive motor, the electric power steering device, the brake device, etc.

[0164] Body system control unit 7200 controls the operation of various devices mounted on the vehicle body in accordance with various programs. For example, body system control unit 7200 functions as a control device for a keyless entry system, a smart key system, a power window device, or various lamps such as head lamps, 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 may be input to body system control unit 7200. Body system control unit 7200 receives these radio waves or signals and controls the vehicle's door lock device, power window device, lamps, etc.

[0165] The battery control unit 7300 controls the secondary battery 7310, which is the power supply source for the drive motor, in accordance with various programs. For example, information such as battery temperature, battery output voltage, or remaining battery capacity is input to the battery control unit 7300 from a battery device equipped with the secondary battery 7310. The battery control unit 7300 performs arithmetic processing using these signals, and controls the temperature regulation of the secondary battery 7310 or a cooling device or the like provided in the battery device.

[0166] The outside vehicle information detection unit 7400 detects information outside the vehicle equipped with the vehicle control system 7000. For example, at least one of an imaging unit 7410 and an outside vehicle information detection unit 7420 is connected to the outside vehicle information detection unit 7400. The imaging unit 7410 includes at least one of a ToF (Time Of Flight) camera, a stereo camera, a monocular camera, an infrared camera, and other cameras. The outside vehicle information detection unit 7420 includes at least one of an environmental sensor for detecting the current weather or climate, or a surrounding information detection sensor for detecting other vehicles, obstacles, pedestrians, etc. around the vehicle equipped with the vehicle control system 7000.

[0167] The environmental sensor may be, for example, at least one of a raindrop sensor that detects rain, a fog sensor that detects fog, a sunshine sensor that detects the degree of sunshine, and a snow sensor that detects snowfall. The surrounding information detection sensor may be at least one of an ultrasonic sensor, a radar device, and a LIDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging) device. The imaging unit 7410 and the outside vehicle information detection unit 7420 may each be provided as an independent sensor or device, or may be provided as a device in which multiple sensors or devices are integrated.

[0168] 58 shows an example of the installation positions of the imaging unit 7410 and the vehicle exterior information detection unit 7420. The imaging units 7910, 7912, 7914, 7916, and 7918 are provided, for example, at least one of the front nose, side mirrors, rear bumper, back door, and upper part of the windshield inside the vehicle cabin of the vehicle 7900. The imaging unit 7910 provided on the front nose and the imaging unit 7918 provided on the upper part of the windshield inside the vehicle cabin mainly acquire images of the front of the vehicle 7900. The imaging units 7912 and 7914 provided on the side mirrors mainly acquire images of the sides of the vehicle 7900. The imaging unit 7916 provided on the rear bumper or back door mainly acquires images of the rear of the vehicle 7900. The imaging unit 7918 provided on the upper part of the windshield inside the vehicle cabin is mainly used to detect leading vehicles, pedestrians, obstacles, traffic lights, traffic signs, lanes, etc.

[0169] 58 shows an example of the imaging ranges of the imaging units 7910, 7912, 7914, and 7916. Imaging range a indicates the imaging range of imaging unit 7910 provided on the front nose, imaging ranges b and c indicate the imaging ranges of imaging units 7912 and 7914 provided on the side mirrors, respectively, and imaging range d indicates the imaging range of imaging unit 7916 provided on the rear bumper or back door. For example, by overlaying the image data captured by imaging units 7910, 7912, 7914, and 7916, a bird's-eye view image of vehicle 7900 viewed from above can be obtained.

[0170] The vehicle exterior information detection units 7920, 7922, 7924, 7926, 7928, and 7930 provided on the front, rear, sides, and corners of the vehicle 7900 and above the windshield inside the vehicle cabin may be, for example, ultrasonic sensors or radar devices. The vehicle exterior information detection units 7920, 7926, and 7930 provided on the front nose, rear bumper, back door, and above the windshield inside the vehicle cabin of the vehicle 7900 may be, for example, LIDAR devices. These vehicle exterior information detection units 7920 to 7930 are mainly used to detect preceding vehicles, pedestrians, obstacles, etc.

[0171] Returning to FIG. 57 , the explanation continues. The outside-vehicle information detection unit 7400 causes the imaging unit 7410 to capture an image outside the vehicle and receives the captured image data. The outside-vehicle information detection unit 7400 also receives detection information from the connected outside-vehicle information detection unit 7420. If the outside-vehicle information detection unit 7420 is an ultrasonic sensor, a radar device, or a LIDAR device, the outside-vehicle information detection unit 7400 emits ultrasonic waves or electromagnetic waves and receives information on the received reflected waves. The outside-vehicle information detection unit 7400 may perform object detection processing or distance detection processing for people, cars, obstacles, signs, text on the road, etc., based on the received information. The outside-vehicle information detection unit 7400 may also perform environment recognition processing for recognizing rainfall, fog, road conditions, etc., based on the received information. The outside-vehicle information detection unit 7400 may also calculate the distance to an object outside the vehicle based on the received information.

[0172] The outside vehicle information detection unit 7400 may also perform image recognition processing or distance detection processing to recognize people, vehicles, obstacles, signs, characters on the road, etc., based on the received image data. The outside vehicle information detection unit 7400 may perform processing such as distortion correction or alignment on the received image data, and may also generate an overhead image or a panoramic image by combining image data captured by different image capturing units 7410. The outside vehicle information detection unit 7400 may also perform viewpoint conversion processing using image data captured by different image capturing units 7410.

[0173] The interior information detection unit 7500 detects information inside the vehicle. A driver state detection unit 7510 that detects the state of the driver is connected to the interior information detection unit 7500, for example. The driver state detection unit 7510 may include a camera that captures an image of the driver, a biosensor that detects the driver's biometric information, or a microphone that collects sound from within the vehicle cabin. The biosensor is provided, for example, on the seat or steering wheel, and detects the biometric information of a passenger sitting in the seat or the driver gripping the steering wheel. The interior information detection unit 7500 may calculate the driver's level of fatigue or concentration, or determine whether the driver is dozing, based on the detection information input from the driver state detection unit 7510. The interior information detection unit 7500 may perform processing such as noise canceling on the collected audio signal.

[0174] The integrated control unit 7600 controls the overall operation of the vehicle control system 7000 in accordance with various programs. An input unit 7800 is connected to the integrated control unit 7600. The input unit 7800 may be implemented by a device that can be operated by a passenger, such as a touch panel, a button, a microphone, a switch, or a lever. Data obtained by voice recognition of a voice input through a microphone may be input to the integrated control unit 7600. The input unit 7800 may be, for example, a remote control device using infrared or other radio waves, or an externally connected device such as a mobile phone or a personal digital assistant (PDA) that can operate the vehicle control system 7000. The input unit 7800 may be, for example, a camera, in which case the passenger can input information by gestures. Alternatively, data obtained by detecting the movement of a wearable device worn by the passenger may be input. Furthermore, the input unit 7800 may include, for example, an input control circuit that generates an input signal based on information input by the passenger or the like using the input unit 7800 and outputs the input signal to the integrated control unit 7600. By operating this input unit 7800, passengers and the like input various data to the vehicle control system 7000 and instruct processing operations.

[0175] The storage unit 7690 may include a ROM (Read Only Memory) that stores various programs executed by the microcomputer, and a RAM (Random Access Memory) that stores various parameters, calculation results, sensor values, etc. The storage unit 7690 may also be realized by a magnetic storage device such as an HDD (Hard Disc Drive), a semiconductor storage device, an optical storage device, a magneto-optical storage device, or the like.

[0176] The general-purpose communication I / F 7620 is a general-purpose communication I / F that mediates communication between various devices present in the external environment 7750. The general-purpose communication I / F 7620 may implement a cellular communication protocol such as GSM (Global System of Mobile communications), WiMAX (registered trademark), LTE (Long Term Evolution), or LTE-Advanced (LTE-A), or other wireless communication protocols such as wireless LAN (also referred to as Wi-Fi (registered trademark)) or Bluetooth (registered trademark). The general-purpose communication I / F 7620 may connect to devices (e.g., application servers or control servers) present on an external network (e.g., the Internet, a cloud network, or an operator-specific network) via, for example, a base station or an access point. The general-purpose communication I / F 7620 may also connect to terminals present near the vehicle (e.g., terminals of drivers, pedestrians, or stores, or machine-type communication (MTC) terminals) using, for example, P2P (Peer to Peer) technology.

[0177] The dedicated communication I / F 7630 is a communication I / F that supports a communication protocol designed for use in vehicles. The dedicated communication I / F 7630 may implement a standard protocol such as WAVE (Wireless Access in Vehicle Environment), which is a combination of a lower layer IEEE802.11p and an upper layer IEEE1609, a dedicated short range communications (DSRC), or a cellular communication protocol. The dedicated communication I / F 7630 typically performs V2X communication, which is a concept including one or more of vehicle-to-vehicle communication, vehicle-to-infrastructure communication, vehicle-to-home communication, and vehicle-to-pedestrian communication.

[0178] The positioning unit 7640 performs positioning by receiving, for example, GNSS signals from GNSS (Global Navigation Satellite System) satellites (for example, GPS signals from GPS (Global Positioning System) satellites), and generates position information including the latitude, longitude, and altitude of the vehicle. Note that the positioning unit 7640 may identify the current position by exchanging signals with a wireless access point, or may obtain position information from a terminal such as a mobile phone, PHS, or smartphone that has a positioning function.

[0179] The beacon receiver 7650 receives, for example, radio waves or electromagnetic waves transmitted from radio stations or the like installed on the road, and acquires information such as the current location, congestion, road closures, required travel time, etc. The function of the beacon receiver 7650 may be included in the dedicated communication I / F 7630 described above.

[0180] The in-vehicle device I / F 7660 is a communication interface that mediates connections between the microcomputer 7610 and various in-vehicle devices 7760 present in the vehicle. The in-vehicle device I / F 7660 may establish a wireless connection using a wireless communication protocol such as wireless LAN, Bluetooth (registered trademark), NFC (Near Field Communication), or WUSB (Wireless USB). The in-vehicle device I / F 7660 may also establish a wired connection such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface), or MHL (Mobile High-Definition Link) via a connection terminal (and a cable, if necessary) not shown. The in-vehicle device 7760 may include, for example, at least one of a mobile device or a wearable device owned by a passenger, or an information device carried or installed in the vehicle. The in-vehicle device 7760 may also include a navigation device that searches for a route to a desired destination. The in-vehicle device I / F 7660 exchanges control signals or data signals with these in-vehicle devices 7760 .

[0181] The in-vehicle network I / F 7680 is an interface that mediates communication between the microcomputer 7610 and the communication network 7010. The in-vehicle network I / F 7680 transmits and receives signals in accordance with a predetermined protocol supported by the communication network 7010.

[0182] The microcomputer 7610 of the integrated control unit 7600 controls the vehicle control system 7000 in accordance with various programs based on information acquired via at least one of the general-purpose communication I / F 7620, the dedicated communication I / F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle device I / F 7660, and the in-vehicle network I / F 7680. For example, the microcomputer 7610 may calculate control target values ​​for the driving force generating device, the steering mechanism, or the braking device based on acquired information inside and outside the vehicle, and output control commands to the drivetrain control unit 7100. For example, the microcomputer 7610 may perform cooperative control aimed at realizing functions of an Advanced Driver Assistance System (ADAS), including vehicle collision avoidance or impact mitigation, following driving based on the following distance, vehicle speed maintenance driving, vehicle collision warning, vehicle lane departure warning, etc. In addition, the microcomputer 7610 may perform cooperative control for the purpose of autonomous driving, in which the vehicle travels autonomously without relying on driver operation, by controlling a driving force generating device, a steering mechanism, a braking device, etc. based on information acquired about the vehicle's surroundings.

[0183] The microcomputer 7610 may generate three-dimensional distance information between the vehicle and objects such as surrounding structures and people, and create local map information including information about the vicinity of the vehicle's current location, based on information acquired via at least one of the general-purpose communication I / F 7620, the dedicated communication I / F 7630, the positioning unit 7640, the beacon receiving unit 7650, the in-vehicle device I / F 7660, and the in-vehicle network I / F 7680. Furthermore, the microcomputer 7610 may predict dangers, such as a vehicle collision, the approach of a pedestrian, or entry into a closed road, based on the acquired information, and generate a warning signal. The warning signal may be, for example, a signal for generating a warning sound or turning on a warning lamp.

[0184] The audio / video output unit 7670 transmits at least one of audio and image output signals to an output device capable of visually or audibly notifying vehicle occupants or the outside of the vehicle of information. In the example of FIG. 57 , an audio speaker 7710, a display unit 7720, and an instrument panel 7730 are illustrated as output devices. The display unit 7720 may include, for example, at least one of an on-board display and a head-up display. The display unit 7720 may have an AR (Augmented Reality) display function. The output device may be other devices besides these devices, such as headphones, a wearable device such as an eyeglass-type display worn by the occupant, a projector, or a lamp. When the output device is a display device, the display device visually displays results obtained by various processes performed by the microcomputer 7610 or information received from other control units in various formats, such as text, images, tables, and graphs. When the output device is an audio output device, the audio output device converts audio signals consisting of reproduced audio data or acoustic data into analog signals and audibly outputs the analog signals.

[0185] In the example shown in FIG. 57 , at least two control units connected via the communication network 7010 may be integrated into one control unit. Alternatively, each control unit may be composed of multiple control units. Furthermore, the vehicle control system 7000 may include another control unit not shown. In the above description, some or all of the functions performed by one control unit may be performed by another control unit. In other words, as long as information is transmitted and received via the communication network 7010, predetermined arithmetic processing may be performed by one of the control units. Similarly, a sensor or device connected to one control unit may be connected to another control unit, and multiple control units may transmit and receive detection information to and from each other via the communication network 7010.

[0186] In the vehicle control system 7000 described above, the converter lens and imaging device of the present disclosure can be applied to the imaging unit 7410 and the imaging units 7910, 7912, 7914, 7916, and 7918.

[0187] [5.2 Second application example] The technology disclosed herein can be applied to a medical imaging system, which is a medical system that uses imaging technology, such as an endoscope system or a microscope system.

[0188] [Endoscope system] An example of an endoscopic system will be described with reference to Figs. 59 and 60. Fig. 59 is a diagram illustrating an example of the schematic configuration of an endoscopic system 5000 to which the technology according to the present disclosure can be applied. Fig. 60 is a diagram illustrating an example of the configuration of an endoscope 5001 and a CCU (Camera Control Unit) 5039. Fig. 59 illustrates a state in which an operator (e.g., a doctor) 5067, who is a surgical participant, is performing surgery on a patient 5071 on a patient bed 5069 using the endoscopic system 5000. As shown in Fig. 59, the endoscopic system 5000 includes an endoscope 5001, which is a medical imaging device, a CCU 5039, a light source device 5043, a recording device 5053, an output device 5055, and a support device 5027 that supports the endoscope 5001.

[0189] In endoscopic surgery, an insertion aid called a trocar 5025 is inserted into a patient 5071. Then, a scope 5003 and surgical tools 5021 connected to an endoscope 5001 are inserted into the body of the patient 5071 via the trocar 5025. The surgical tools 5021 are, for example, energy devices such as an electric scalpel, forceps, etc.

[0190] A surgical image, which is a medical image showing the inside of the body of a patient 5071 photographed by an endoscope 5001, is displayed on a display device 5041. An operator 5067 performs a procedure on the surgical target using a surgical tool 5021 while viewing the surgical image displayed on the display device 5041. Note that the medical image is not limited to a surgical image, and may be a diagnostic image photographed during a diagnosis.

[0191] [Endoscopy] The endoscope 5001 is an imaging unit that captures images of the inside of the body of a patient 5071. For example, as shown in FIG. 60 , the endoscope 5001 is a camera 5005 that includes a focusing optical system 50051 that focuses incident light, a zoom optical system 50052 that enables optical zoom by changing the focal length of the imaging unit, a focus optical system 50053 that enables focus adjustment by changing the focal length of the imaging unit, and a light-receiving element 50054. The endoscope 5001 generates pixel signals by focusing light onto the light-receiving element 50054 via a connected scope 5003, and outputs the pixel signals to the CCU 5039 via a transmission system. The scope 5003 has an objective lens at its tip and is an insertion section that guides light from a connected light source device 5043 into the body of the patient 5071. The scope 5003 is, for example, a rigid scope if it is a rigid endoscope or a flexible scope if it is a flexible endoscope. The scope 5003 may be a direct endoscope or an oblique endoscope. Furthermore, the pixel signal may be a signal based on a signal output from a pixel, such as a RAW signal or an image signal. A configuration may also be adopted in which a memory is installed in the transmission system connecting the endoscope 5001 and the CCU 5039, and parameters related to the endoscope 5001 and the CCU 5039 are stored in the memory. The memory may be located, for example, at a connection portion of the transmission system or on a cable. For example, parameters at the time of shipment of the endoscope 5001 and parameters that change when power is applied may be stored in the memory of the transmission system, and the operation of the endoscope may be changed based on parameters read from the memory. The endoscope and the transmission system may be collectively referred to as an endoscope. The light receiving element 50054 is a sensor that converts received light into a pixel signal, and is, for example, a CMOS (Complementary Metal Oxide Semiconductor) type imaging element. It is preferable that the light receiving element 50054 be an imaging element capable of color imaging with a Bayer array. Furthermore, the light receiving element 50054 is preferably an imaging element having a number of pixels corresponding to a resolution of, for example, 4K (3840 horizontal pixels × 2160 vertical pixels), 8K (7680 horizontal pixels × 4320 vertical pixels), or square 4K (3840 or more horizontal pixels × 3840 or more vertical pixels). The light receiving element 50054 may be a single sensor chip or multiple sensor chips.For example, a prism may be provided to separate incident light into predetermined wavelength bands, and each wavelength band may be imaged by a different light-receiving element. Alternatively, multiple light-receiving elements may be provided for stereoscopic vision. The light-receiving element 50054 may be a sensor including an image processing circuit within its chip structure, or a Time of Flight (ToF) sensor. The transmission system may be, for example, an optical fiber cable or wireless transmission. Wireless transmission may be performed via any means capable of transmitting pixel signals generated by the endoscope 5001. For example, the endoscope 5001 and the CCU 5039 may be connected wirelessly, or the endoscope 5001 and the CCU 5039 may be connected via a base station in the operating room. In this case, the endoscope 5001 may simultaneously transmit not only pixel signals but also information related to the pixel signals (e.g., pixel signal processing priority, synchronization signal, etc.). The endoscope may be configured such that the scope and camera are integrated, or a light-receiving element is provided at the tip of the scope.

[0192] [CCU (Camera Control Unit)] The CCU 5039 is a control device that comprehensively controls the connected endoscope 5001 and light source device 5043, and is, for example, an information processing device having an FPGA 50391, a CPU 50392, a RAM 50393, a ROM 50394, a GPU 50395, and an I / F 50396, as shown in FIG. 60 . The CCU 5039 may also comprehensively control the connected display device 5041, recording device 5053, and output device 5055. For example, the CCU 5039 controls the irradiation timing, irradiation intensity, and type of irradiation light source of the light source device 5043. The CCU 5039 also performs image processing such as development processing (e.g., demosaic processing) and correction processing on pixel signals output from the endoscope 5001, and outputs the processed pixel signals (e.g., images) to an external device such as the display device 5041. The CCU 5039 also transmits control signals to the endoscope 5001 to control the driving of the endoscope 5001. The control signal is, for example, information regarding imaging conditions such as the magnification and focal length of the imaging unit. The CCU 5039 may have an image down-conversion function and may be configured to be able to simultaneously output a high-resolution (e.g., 4K) image to the display device 5041 and a low-resolution (e.g., HD) image to the recording device 5053.

[0193] The CCU 5039 may also be connected to external devices (e.g., recording devices, display devices, output devices, and support devices) via an IP converter that converts signals into a predetermined communication protocol (e.g., IP (Internet Protocol)). The connection between the IP converter and the external device may be configured as a wired network, or a partial or entire network may be configured as a wireless network. For example, the IP converter on the CCU 5039 side may have a wireless communication function and transmit the received video to an IP switcher or an output-side IP converter via a wireless communication network such as a fifth-generation mobile communication system (5G) or a sixth-generation mobile communication system (6G).

[0194] [Light source device] The light source device 5043 is a device capable of emitting light in a predetermined wavelength band and includes, for example, multiple light sources and a light source optical system that guides the light from the multiple light sources. The light sources are, for example, a xenon lamp, an LED light source, or an LD light source. The light source device 5043 has, for example, LED light sources corresponding to the three primary colors R, G, and B, and emits white light by controlling the output intensity and output timing of each light source. The light source device 5043 may also include a light source that can emit special light used for special light observation, in addition to a light source that emits normal light used for normal light observation. The special light is light in a predetermined wavelength band different from the normal light used for normal light observation, such as near-infrared light (light with a wavelength of 760 nm or more), infrared light, blue light, or ultraviolet light. The normal light is, for example, white light or green light. Narrowband light observation, which is a type of special light observation, alternately emits blue light and green light, allowing high-contrast imaging of specific tissues, such as blood vessels on the surface of mucous membranes, by utilizing the wavelength-dependence of light absorption in body tissue. Furthermore, in fluorescence observation, which is a type of special light observation, excitation light that excites a drug injected into body tissue is irradiated and fluorescence emitted by the body tissue or the drug as a marker is received to obtain a fluorescence image, thereby making it easier for the surgeon to visualize body tissue that is difficult for the surgeon to visualize under normal light. For example, in fluorescence observation using infrared light, infrared light having an excitation wavelength band is irradiated onto a drug such as indocyanine green (ICG) injected into body tissue, and the fluorescence of the drug is received, making it easier to visualize the structure of body tissue and affected areas. Furthermore, in fluorescence observation, a drug (e.g., 5-ALA) that is excited by special light in the blue wavelength band and emits fluorescence in the red wavelength band may be used. The type of irradiated light for the light source device 5043 is set under the control of the CCU 5039. The CCU 5039 may have a mode in which normal light observation and special light observation are alternately performed by controlling the light source device 5043 and the endoscope 5001. In this case, it is preferable that information based on pixel signals obtained under special light observation be superimposed on pixel signals obtained under normal light observation. The special light observation may be infrared observation, which uses infrared light to see deeper than the surface of an organ, or multispectral observation using hyperspectral spectroscopy. Photodynamic therapy may also be combined.

[0195] [Recording Device] The recording device 5053 is a device, such as a recorder, that records pixel signals (e.g., images) acquired from the CCU 5039. The recording device 5053 records images acquired from the CCU 5039 on a HDD, an SDD, or an optical disk. The recording device 5053 may be connected to a network within the hospital so as to be accessible from devices outside the operating room. The recording device 5053 may also have an image down-conversion or up-conversion function.

[0196] [Display device] The display device 5041 is a device capable of displaying an image, such as a display monitor. The display device 5041 displays an image based on pixel signals acquired from the CCU 5039. The display device 5041 may also function as an input device that enables gaze recognition, voice recognition, and instruction input using gestures by including a camera and a microphone.

[0197] [Output device] The output device 5055 is a device, such as a printer, that outputs information acquired from the CCU 5039. The output device 5055 prints, for example, a print image based on the pixel signal acquired from the CCU 5039 onto paper.

[0198] [Support device] The support device 5027 is an articulated arm including a base 5029 having an arm control device 5045, an arm 5031 extending from the base 5029, and a holder 5032 attached to the tip of the arm 5031. The arm control device 5045 is configured with a processor such as a CPU and controls the drive of the arm 5031 by operating according to a predetermined program. The support device 5027 controls the position and posture of the endoscope 5001 held by the holder 5032, for example, by controlling parameters such as the length of each link 5035 constituting the arm 5031 and the rotation angle and torque of each joint 5033 using the arm control device 5045. This allows the endoscope 5001 to be changed to a desired position or posture, allowing the scope 5003 to be inserted into the patient 5071 and the observation area within the body to be changed. The support device 5027 functions as an endoscope support arm that supports the endoscope 5001 during surgery. This allows the support device 5027 to take the place of an assistant scopist who holds the endoscope 5001. The support device 5027 may also be a device that supports a microscope device 5301 (described later) and may also be called a medical support arm. The support device 5027 may be controlled autonomously by the arm control device 5045, or may be controlled by the arm control device 5045 based on user input. For example, the control method may be a master-slave method in which the support device 5027, which serves as a slave device (replica device) serving as a patient cart, is controlled based on the movement of a master device (primary device) that is an operator console located at the user's hand. The support device 5027 may also be remotely controlled from outside the operating room.

[0199] The above describes an example of an endoscope system 5000 to which the technology according to the present disclosure can be applied. For example, the technology according to the present disclosure may be applied to a microscope system.

[0200] [Microscope system] 61 is a diagram showing an example of a schematic configuration of a microsurgical system to which the technology according to the present disclosure can be applied. In the following description, the same components as those in the endoscope system 5000 are denoted by the same reference numerals, and redundant description thereof will be omitted.

[0201] 61 shows a schematic diagram of an operator 5067 performing surgery on a patient 5071 on a patient bed 5069 using a microsurgical system 5300. For simplicity, the illustration of the cart 5037 of the microsurgical system 5300 is omitted, and a microscope device 5301 that replaces the endoscope 5001 is simplified. However, the microscope device 5301 in this description may refer to the microscope unit 5303 provided at the tip of the link 5035, or may refer to the entire configuration including the microscope unit 5303 and the support device 5027.

[0202] As shown in Figure 61, during surgery, a microsurgical system 5300 is used to display an enlarged image of the surgical site captured by a microscope device 5301 on a display device 5041 installed in an operating room. The display device 5041 is installed in a position facing an operator 5067, who performs various procedures on the surgical site, such as resecting the affected area, while observing the state of the surgical site using the image displayed on the display device 5041. Microsurgical systems are used, for example, in ophthalmic surgery and brain surgery.

[0203] The above describes examples of an endoscopic system 5000 and a microsurgery system 5300 to which the technology of the present disclosure can be applied. Note that the systems to which the technology of the present disclosure can be applied are not limited to these examples. For example, the support device 5027 may support another observation device or another surgical tool at its tip instead of the endoscope 5001 or the microscope unit 5303. Examples of such other observation devices include forceps, a surgeon, an insufflation tube for insufflation, or an energy treatment tool for incising tissue or sealing blood vessels by cauterization. Supporting these observation devices and surgical tools with a support device allows them to be more stably fixed in position than when medical staff support them manually, and also reduces the burden on medical staff. The technology of the present disclosure may be applied to support devices that support components other than the microscope unit.

[0204] Of the configurations described above, the technology according to the present disclosure can be suitably applied to the camera 5005. In particular, the converter lens according to the present disclosure can be suitably applied to at least some of the optical systems of the camera 5005: the focusing optical system 50051, the zoom optical system 50052, and the focus optical system 50053.

[0205] <6. Other embodiments> The technology according to the present disclosure is not limited to the above-described embodiment and examples, and various modifications are possible.

[0206] For example, the shapes and numerical values ​​of each part shown in the above embodiment and example are merely examples of specific embodiments for implementing this technology, and the technical scope of this technology should not be interpreted in a limited manner based on these.

[0207] Furthermore, for example, the configuration may include a number of lenses different from the number of lenses shown in the above embodiment and example, or may include a lens that has substantially no refractive power.

[0208] For example, the present technology can be configured as follows. According to the present technology having the following configuration, the lens configuration is optimized to enable a converter lens that is small, highly versatile, and capable of achieving high image quality, and it is thereby possible to provide a converter lens that is small, highly versatile, and capable of achieving high image quality, and an imaging device equipped with such a converter lens.

[0209] [1] a converter lens disposed on an image plane side of an imaging optical system and re-forming an image formed by the imaging optical system, a plurality of lenses including at least one single lens or at least one cemented lens; The plurality of lenses include a first single lens or a first cemented lens arranged closest to the object side within the converter lens, an object-side surface of the first single lens or the first cemented lens is located closer to the object side than a primary image point of the imaging optical system, the primary image point exists outside the plurality of lenses constituting the converter lens, The following condition is satisfied: Converter lens. 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 ……(2) however, da: the distance from the vertex of the object side surface of the first single lens or the first cemented lens to the primary image point db: distance from the vertex of the object side surface of the first single lens or the first cemented lens to the secondary image point dc: the distance from the vertex of the lens surface closest to the primary image point to the primary image point Let's say. [2] Furthermore, the following condition is satisfied: The converter lens according to [1] above. -5.0≦db / f1≦5.0 ……(3) however, f1: the focal length of the lens group of the converter lens that is arranged closer to the object than the primary image point Let's say. [3] The plurality of lenses further includes a second single lens or a second cemented lens arranged immediately behind the primary image point, The following condition is satisfied: The converter lens according to [1] or [2] above. 0.01≦f2 / db≦5.0 ……(4) however, f2: focal length of the second single lens or the second cemented lens Let's say. [4] Furthermore, the following condition is satisfied: The converter lens according to any one of [1] to [3] above. -1.0≦f3 / db≦-0.01 ……(5) however, f3: the focal length of the lens in the converter lens that is located closest to the image plane Let's say. [5] An aperture stop is disposed within the converter lens, and when the converter lens is attached to the imaging optical system, the F-number is changed by the aperture stop within the converter lens. The converter lens according to any one of [1] to [4] above. [6] The vertical and horizontal focal lengths are different The converter lens according to any one of [1] to [5] above. [7] a converter lens disposed on an image plane side of an imaging optical system, for reforming an image formed by the imaging optical system, and an imaging element for outputting an imaging signal corresponding to the optical image formed by the converter lens; The converter lens comprises: a plurality of lenses including at least one single lens or at least one cemented lens; The plurality of lenses include a first single lens or a first cemented lens arranged closest to the object side within the converter lens, an object-side surface of the first single lens or the first cemented lens is located closer to the object side than a primary image point of the imaging optical system, the primary image point exists outside the plurality of lenses constituting the converter lens, The following condition is satisfied: Imaging device. 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 ……(2) however, da: the distance from the vertex of the object side surface of the first single lens or the first cemented lens to the primary image point db: distance from the vertex of the object side surface of the first single lens or the first cemented lens to the secondary image point dc: the distance from the vertex of the lens surface closest to the primary image point to the primary image point Let's say. [8] Further comprising a lens having substantially no refractive power. The converter lens according to any one of [1] to [6] above. [9] The converter lens further comprises a lens having substantially no optical power. The imaging device according to [7] above. [Explanation of symbols]

[0210] L11...lens (first single lens or first cemented lens arranged closest to the object in the converter lens CL), L21...lens (second single lens or second cemented lens arranged immediately after the primary image point P1), CL...converter lens, ML...master lens (imaging optical system), MG1...first lens group, MG2...second lens group, MG3...third lens group, P1...primary image point, P2...secondary image point, G1...first lens group, G2...second lens group, G3...third lens group, St...aperture stop, Z1...optical axis, 1 to 6...(converter lens) Optical system (with lens attached), 110...camera block, 111...imaging lens, 112...imaging element, 20...camera signal processing unit, 30...image processing unit, 40...LCD, 50...R / W (reader / writer), 60...CPU, 70...input unit, 80...lens drive control unit, 100...imaging device, 1000...memory card, 5005...camera, 50051...light-collecting optical system, 50052...zoom optical system, 50053...focus optical system, 50054...light-receiving element, 7410...imaging unit, 7910, 7912, 7914, 7916, 7918...imaging units.

Claims

1. A converter lens is disposed on an image plane side of an imaging optical system and re-images an image formed by the imaging optical system, A plurality of lenses including at least one single lens or at least one cemented lens; The plurality of lenses include a first single lens or a first cemented lens arranged closest to an object in the converter lens, an object-side surface of the first single lens or the first cemented lens is disposed on the object side of a primary image point of the imaging optical system, the primary image point exists outside the plurality of lenses constituting the converter lens, The following condition is satisfied: Converter lens. 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 … (2) however, da: the distance from the vertex of the object side surface of the first single lens or the first cemented lens to the primary image point d: distance from the vertex of the object side surface of the first single lens or the first cemented lens to the secondary image point dc: the distance from the vertex of the lens surface closest to the primary image point to the primary image point Let us assume that.

2. Furthermore, the following condition is satisfied:

2. The converter lens of claim 1. −5.0≦db / f1≦5.0 ……(3) however, f1: focal length of the lens group of the converter lens arranged on the object side of the primary image point Let us assume that.

3. The plurality of lenses further includes a second single lens or a second cemented lens arranged immediately behind the primary image point, The following condition is satisfied:

2. The converter lens of claim 1. 0.01≦f2 / db≦5.0 ……(4) however, f2: focal length of the second single lens or the second cemented lens Let us assume that.

4. Furthermore, the following condition is satisfied:

2. The converter lens of claim 1. −1.0≦f3 / db≦−0.01 ……(5) however, f3: focal length of the lens located closest to the image plane in the converter lens Let us assume that.

5. An aperture stop is disposed within the converter lens, and in a state in which the converter lens is attached to the imaging optical system, the F-number is changed by the aperture stop within the converter lens.

2. The converter lens of claim 1.

6. The vertical and horizontal focal lengths are different 2. The converter lens of claim 1.

7. a converter lens disposed on an image plane side of an imaging optical system for reforming an image formed by the imaging optical system; and an imaging element for outputting an imaging signal corresponding to the optical image formed by the converter lens, The converter lens comprises: A plurality of lenses including at least one single lens or at least one cemented lens; The plurality of lenses include a first single lens or a first cemented lens arranged closest to an object in the converter lens, an object-side surface of the first single lens or the first cemented lens is disposed on the object side of a primary image point of the imaging optical system, the primary image point exists outside the plurality of lenses constituting the converter lens, The following condition is satisfied: Imaging device. 0.01≦da / db≦0.175 ……(1) 0.01≦dc / db≦0.165 … (2) however, da: the distance from the vertex of the object side surface of the first single lens or the first cemented lens to the primary image point d: distance from the vertex of the object side surface of the first single lens or the first cemented lens to the secondary image point dc: the distance from the vertex of the lens surface closest to the primary image point to the primary image point Let us assume that.

8. Further comprising a lens having substantially no refractive power.

7. A converter lens according to claim 1.

9. The converter lens further comprising a lens having substantially no refractive power. The imaging device according to claim 7.

Images