Image pickup lens, image pickup device, and information processing device

Abstract

The invention provides an imaging lens, an imaging device and an information processing device which have a wide viewing angle, are bright, have high performance and can be miniaturized. An image pickup lens (100) is provided with: first to fifth lenses (L1-L5) arranged in order from an object side to an image side; and an aperture stop (S) disposed between the first lens (L1) and the second lens (L2). The first lens (L1) is a negative lens having a concave image-side surface and an inflection point at a peripheral portion thereof, the second lens (L2) is a positive lens having a convex image-side surface with a strong curvature, the third lens (L3) is a negative lens having a concave object-side surface, the fourth lens (L4) is a positive lens having a convex image-side surface with a strong curvature, and the fifth lens (L5) is a positive lens having a convex object-side surface with a strong curvature. The fifth lens (L5) is a negative lens having a convex object-side surface and an inflection point at a peripheral portion thereof, and a concave image-side surface and an inflection point at a peripheral portion thereof.

Description

Technical Field

[0001] The present disclosure relates to an imaging lens, an imaging device, and an information processing device. Background Art

[0002] In recent years, imaging devices such as digital cameras, digital video cameras, and smartphone cameras that include individual imaging elements such as CCD (Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) and imaging lenses have become popular.

[0003] Individual image pickup elements used in these image pickup devices are becoming increasingly high in pixel count, and as the number of individual image pickup elements increases, image pickup lenses are also being required to have higher optical performance.

[0004] In recent years, in a PC (Personal Computer) equipped with a camera device, dynamic images are distributed and communicated through the Web. Therefore, in the camera device, miniaturization is also sought in consideration of portability. The camera device required in the market mainly takes into account both high performance and miniaturization, and the camera lens is also required to be not only high-performance but also miniaturized. Therefore, a camera lens that takes into account both high performance and miniaturization is known (for example, refer to Patent Document 1).

[0005] Patent Document 1: Japanese Patent Application No. 2017-513034

[0006] However, in recent years, when distributing and communicating moving images via the Web, it is desired to be able to capture images with a wider angle of view than conventional camera lenses. Therefore, a camera lens with a wider angle of view than conventional camera lenses, brighter brightness, higher performance, and smaller size is desired. Summary of the invention

[0007] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a wide-angle, bright, high-performance, and compact imaging lens, an imaging device, and an information processing device.

[0008] In order to solve the above-mentioned problems and achieve the purpose, the first mode of the present invention involves an imaging lens comprising: a first lens to a fifth lens, which are arranged in sequence from the object side to the image side; and an aperture stop, which is arranged between the first lens and the second lens, wherein the first lens is a negative lens whose image side surface is a concave surface and has an inflection point in the peripheral portion, the second lens is a positive lens whose image side surface is a convex surface with a strong curvature, the third lens is a negative lens whose object side surface is a concave surface, the fourth lens is a positive lens whose image side surface is a convex surface with a strong curvature, and the fifth lens is a negative lens whose object side surface is a convex surface with an inflection point in the peripheral portion and whose image side surface is a concave surface with an inflection point in the peripheral portion, and when the focal length of the entire system is set to F, the focal length of the first lens is set to f1, the focal length of the fifth lens is set to f5, and the composite focal length of the lenses on the image side from the aperture stop is set to G2, conditions (1) and (2) are satisfied.

[0009] 2.0<f1 / f5<10.5···(1)

[0010] 2.5<|f1 / G2|<9.0···(2)

[0011] Furthermore, an imaging device according to a second aspect of the present disclosure includes: the imaging lens described above; and a separate imaging element configured to generate an imaging signal by receiving an image formed by the imaging lens.

[0012] Furthermore, an information processing device according to a third aspect of the present disclosure includes: the imaging device described above; and a display unit that displays an image corresponding to the imaging signal generated by the imaging device.

[0013] According to the present disclosure, it is possible to provide a wide viewing angle, bright, high-performance, and compact imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing the lens structure of the imaging lens according to the first embodiment of the present disclosure.

[0015] Figure 2 1 and 2 are aberration diagrams of the imaging lens according to Embodiment 1 of the present disclosure.

[0016] Figure 3 It is a diagram showing the lens structure of an imaging lens according to Embodiment 2 of the present disclosure.

[0017] Figure 4 1 and 1 are aberration diagrams of the imaging lens according to the second embodiment of the present disclosure.

[0018] Figure 5 It is a diagram showing the lens structure of an imaging lens according to Embodiment 3 of the present disclosure.

[0019] Figure 6 1 and 1 are aberration diagrams of the imaging lens according to Embodiment 3 of the present disclosure.

[0020] Figure 7 It is a diagram showing the lens structure of an imaging lens according to Embodiment 4 of the present disclosure.

[0021] Figure 8 1 and 1 are aberration diagrams of the imaging lens according to the fourth embodiment of the present disclosure.

[0022] Fig. 9 This is a diagram showing a schematic configuration of an information processing device including an imaging device having an imaging lens according to each embodiment of the present disclosure.

[0023] Fig.10 Yes means Fig. 9 FIG. 1 is a diagram showing a brief configuration of an imaging device.

[0024] Fig.11 This is a block diagram showing the functional configuration of an information processing device including an imaging device having an imaging lens according to each embodiment of the present disclosure.

[0025] Description of Reference Numerals

[0026] 30…information processing device; 31…imaging device; 100…imaging lens; L1…first lens; L2…second lens; L3…third lens; L4…fourth lens; L5…fifth lens; S…aperture stop; CG…cover glass. DETAILED DESCRIPTION

[0027] Hereinafter, the camera lens, the camera device, and the information processing device involved in the present disclosure will be described with reference to the accompanying drawings. In addition, the present disclosure is not limited by the following embodiments. In addition, the various figures referred to in the following description are only briefly shown to the extent that the contents of the present disclosure can be understood. That is, the present disclosure is not limited to the shapes, sizes, and positional relationships illustrated in the various figures. In addition, the same figure numbers are marked for the same parts and detailed descriptions are omitted.

[0028] [Implementation Method]

[0029] Figure 1 , Figure 3 , Figure 5 as well as Figure 7 These are cross-sectional views showing the lens configurations of the imaging lenses of Embodiments 1 to 4. In each cross-sectional view, the left side is the object side (front), and the right side is the image side (rear).

[0030] The imaging lens 100 of each embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 arranged in order from the object side to the image side, and an aperture stop S (STOP) arranged between the first lens L1 and the second lens L2.

[0031] In addition, Figure 1 , Figure 3 , Figure 5 as well as Figure 7 In the figure, the reference numerals 1 to 11 attached to any one of the first lens L1 to the fifth lens L5 and the aperture stop S represent the surfaces of each lens or the aperture stop. Hereinafter, these surfaces are referred to as surfaces 1 to 11 in order from the object side to the image side. Surface 3 is the surface of the aperture stop S. Figure 1 , Figure 3 , Figure 5 as well as Figure 7 In the figure, reference symbol CG represents a transparent parallel plate equivalent to a device composed of a cover glass of an individual imaging element and at least one of various filters. The incident side surface of the transparent parallel plate CG is referred to as a surface 12, and the image side surface is referred to as a surface 13.

[0032] The imaging lens 100 is a so-called retrofocus lens composed of a negative first group including only the first lens L1 as a group and a positive second group including the second lens L2 to the fifth lens L5 as a group. The imaging lens 100 can obtain a sufficient distance between the exit pupil and the image plane by arranging an aperture stop S between the first lens L1 and the second lens L2 which are far from the image plane, thereby achieving good telecentricity on the image side and easily correcting spherical aberration and coma aberration.

[0033] The first lens L1 is formed by using a negative lens whose image side surface 2 is concave and has an inflection point at the peripheral portion. Here, the peripheral portion refers to a region including 40% to 60% of the aperture of the first lens L1 on the surface 2 side from the optical axis toward the outer edge.

[0034] The second lens L2 is formed using a positive lens whose image-side surface 5 is a convex surface with a strong curvature.

[0035] The third lens L3 is formed by using a negative lens whose object-side surface 6 is a concave surface.

[0036] The fourth lens L4 is constituted by a positive lens whose image-side surface 9 is a convex surface with a strong curvature.

[0037] The fifth lens L5 is composed of a negative lens in which the surface 10 on the object side is convex and has an inflection point in the peripheral portion, and the surface 11 on the image side is concave and has an inflection point in the peripheral portion. Here, the surface 10 on the object side is a convex surface, and the peripheral portion refers to an area containing 60% to 70% of the aperture of the fifth lens L5 on the surface 10 side from the optical axis toward the outer edge. In addition, the surface 11 on the image side is a concave surface, and the peripheral portion refers to an area containing 70% to 80% of the aperture of the fifth lens L5 on the surface 11 side from the optical axis toward the outer edge.

[0038] The first lens L1 to the fifth lens L5 thus configured are all aspherical lenses, each of which has a characteristic aspherical shape. Furthermore, by setting the first lens L1 and the fifth lens L5 to have an inflection point, it is possible to highly correct aberrations while reducing the thickness (total length) of the imaging lens 100 in the optical direction.

[0039] Figure 2 , Figure 4 , Figure 6 as well as Figure 8 These are longitudinal aberration diagrams of the imaging lens 100 of embodiments 1 to 4, respectively. In the spherical aberration diagram, the spherical aberration amounts for the d-line (yellow: wavelength 587.6nm), the g-line (blue: wavelength 435.8nm), and the C-line (red: 653.3nm) are shown, respectively. In addition, in the astigmatism diagram, the solid line S represents the astigmatism amount in the sagittal image plane, and the dotted line T represents the astigmatism amount in the meridional image plane. And, in the distortion aberration diagram, the distortion aberration amount only for the d-line is shown. In addition, Angle (deg) represents the imaging half angle of view (°).

[0040] Next, the conditions of the imaging lens 100 according to each embodiment will be described.

[0041] In the imaging lens 100 of each embodiment, when the focal length of the first lens L1 is set to f1, the focal length of the fifth lens L5 is set to f5, and the combined focal length of the lenses on the image side from the aperture stop S (the second lens L2 to the fifth lens L5) is set to G2, the following conditions (1) and (2) are satisfied.

[0042] 2.0<f1 / f5<10.5···(1)

[0043] 2.5<|f1 / G2|<9.0···(2)

[0044] The condition (1) is a condition for achieving a balance between the negative refractive power of the first lens L1 and the negative refractive power of the fifth lens L5.

[0045] When f1 / f5 is below the lower limit of condition (1), astigmatism tends to be excessive, and distortion and coma aberration are also generated to a large extent, making it difficult to achieve the desired performance. In addition, when f1 / f5 is above the upper limit of condition (1), spherical aberration tends to be insufficient, so the balance with astigmatism is destroyed, making it difficult to achieve the desired performance.

[0046] Condition (2) is a condition for achieving a balance between the negative refractive power of the first lens L1 and the combined positive refractive power of the second lens group, which is the lens on the image side from the aperture stop S.

[0047] When |f1 / G2| is below the lower limit of condition (2), the negative power of the first lens L1 becomes relatively large relative to the combined power of the second group (second lens L2 to fifth lens L5), so astigmatism is excessive, barrel-shaped distortion is strong, and coma tends to be corrected too much. On the other hand, when |f1 / G2| is above the upper limit of condition (2), the negative power of the first lens L1 becomes relatively small relative to the combined power of the second group, so the balance between spherical aberration and astigmatism tends to be disrupted.

[0048] That is, by satisfying the conditions (1) and (2) of the imaging lens 100, a balance is achieved between spherical aberration and astigmatism, and a bright, high-performance, and small (compact) imaging lens 100 can be realized. Here, small means that the thickness is reduced by shortening the total length of the imaging lens 100 in the optical axis direction, and the aperture of the imaging lens 100 is reduced.

[0049] In the imaging lens 100 of each embodiment, when the refractive index of the material of the first lens L1 for the d-line is N1 and the refractive index of the material of the fifth lens L5 for the d-line is N5, the condition (3) is satisfied.

[0050] N1<N5···(3)

[0051] The condition (3) defines the relationship between the refractive index N1 of the material of the first lens L1 and the refractive index N5 of the material of the fifth lens L5.

[0052] The first lens L1 is a negative lens, and in order to fully exert the above-mentioned focus back shifting function, the negative refractive power must be increased. In the present disclosure, the refractive index N1 of the first lens L1 is formed by a material with a refractive index smaller than the refractive index N5 of the fifth lens L5, and by satisfying condition (3), the desired focus back shifting function can be achieved with good chromatic aberration.

[0053] In the imaging lens 100 of each embodiment, the refractive index N1 of the material of the first lens L1 for the d-line satisfies the condition (4).

[0054] 1.49<N1<1.55···(4)

[0055] When the refractive index N1 is below the lower limit of condition (4), the optical performance is further improved, but the cost becomes higher, which is not preferred. In addition, when the refractive index N1 is above the upper limit of condition (4), the optical performance is not preferred because of the influence on chromatic aberration. Therefore, by satisfying condition (4) of the imaging lens 100, a balance between cost and chromatic aberration is achieved, and a bright, high-performance, and small (compact) imaging lens 100 can be realized.

[0056] In the imaging lens 100 of each embodiment, the refractive index N5 of the material of the fifth lens L5 for d-line satisfies the condition (5),

[0057] 1.63<N5<1.67···(5)

[0058] When the refractive index N5 is below the lower limit of condition (5), or when the refractive index N5 is above the upper limit of condition (5), the balance of chromatic aberration is destroyed. Considering the balance between cost and chromatic aberration, by satisfying condition (5), a bright, high-performance and compact imaging lens 100 can be realized.

[0059] In the imaging lens 100 of each embodiment, when the focal length of the entire optical system (imaging lens 100) is f and the total length of the optical system (in the long side direction of the imaging lens 100) is OAL, condition (6) is satisfied.

[0060] 0.25<f / OAL<0.45···(6)

[0061] Condition (6) is a condition for achieving a balance between the focal length f of the entire optical system and the total length OAL.

[0062] In the imaging lens 100 of each embodiment, when f / OAL is below the lower limit of condition (6), a wider angle can be achieved, but the front lens tends to become larger, which may lead to a larger size. In addition, when f / OAL is above the upper limit of condition (6), the total length of the optical system becomes smaller, but it becomes difficult to achieve a wide angle of view. The imaging lens 100 that satisfies condition (6) can achieve a smaller size and a wider angle of view.

[0063] In the imaging lens 100 of each embodiment, when the total length of the optical system is OAL and the optical effective diameter of the lens (first lens L1) disposed most on the object side is SDo, condition (7) is satisfied.

[0064] 1.2<OAL / SDo<1.6···(7)

[0065] Condition (7) is a condition for achieving a balance between the total lens length and the front lens length of the lens (first lens L1).

[0066] When OAL / SDo is below the lower limit of condition (7), the optical system becomes compact (shortened in the optical axis direction), but it is difficult to achieve a wide viewing angle. When OAL / SDo is above the upper limit of condition (7), the performance of the optical system is improved, but it is difficult to achieve compactness (shortened in the optical axis direction). By satisfying condition (7), the imaging lens 100 can achieve compactness (shortened in the optical axis direction) and high performance.

[0067] In the imaging lens 100 of each embodiment, when the focal length of the fourth lens L4 is set to f4 and the focal length of the fifth lens L5 is set to f5, the condition (8) is satisfied.

[0068] 0.5<|f4 / f5|<0.9···(8)

[0069] Condition (8) is a condition for bringing distortion into an optimal range.

[0070] When |f4 / f5| is below the lower limit of condition (8), the optical system tends to have pincushion-shaped distortion, and when |f4 / f5| is above the upper limit of condition (8), the optical system tends to have stronger barrel-shaped distortion. Therefore, by satisfying condition (8), the imaging lens 100 can achieve distortion in the optimal range.

[0071] In addition, in the imaging lens of each embodiment, when the exit pupil position is set to EXP and the image height is set to IH, the condition (9) is satisfied.

[0072] -2.0<EXP / IH<-1.0···(9)

[0073] Condition (9) is a condition for optimizing the incident angle of light on the image plane.

[0074] When EXP / IH is below the lower limit of condition (9), the incident angle of the light tends to be lower, but it is difficult to shorten the total length of the optical system to achieve miniaturization. On the other hand, when EXP / IH is above the upper limit of condition (9), the incident angle of the light tends to be higher. Therefore, by satisfying condition (9), the imaging lens 100 can be miniaturized.

[0075] In the imaging lens 100 of each embodiment, when the optical effective diameter of the lens closest to the object side is denoted by SDo and the entrance pupil diameter of the optical system is denoted by ENP_D, the condition (10) is satisfied.

[0076] 3.5<SDo / ENP_D<5.5···(10)

[0077] Condition (10) is a condition for achieving both wide viewing angle and brightness.

[0078] When SDo / ENP_D is below the lower limit of condition (10), the optical system becomes brighter, but the spherical aberration tends to become larger. When SDo / ENP_D is above the upper limit of condition (10), the optical system tends to correct the spherical aberration, but the brightness tends to become darker. Here, brightness refers to the F number. In addition, the brightness becomes darker when the F number becomes larger.

[0079] In addition, in the imaging lens 100 of each embodiment, when the total optical length is OAL and the image height is IH, the condition (11) is satisfied.

[0080] 1.0<OAL / (2*IH)<1.2···(11)

[0081] Condition (11) is a condition that provides a relationship between the total length of the imaging lens 100 and the image height.

[0082] When OAL / (2*IH) is lower than the lower limit of condition (11), the total length of the optical system tends to be shorter, but when OAL / (2*IH) exceeds the upper limit of condition (11), the total length of the optical system becomes longer. Therefore, by satisfying condition (11), the imaging lens 100 can achieve a balance between shortening (lower height) and improving performance.

[0083] 〔Camera equipment〕

[0084] Next, an embodiment of an information processing device (PC) including an imaging device using the imaging lens 100 of each embodiment as an imaging optical system will be described.

[0085] Fig. 9 1 is a diagram showing a schematic configuration of an information processing device including an imaging device having the imaging lens 100 according to each embodiment. Fig.10 Yes means Fig. 9 FIG. 1 is a diagram showing a brief configuration of an imaging device.

[0086] Fig.11 This is a block diagram showing the functional configuration of an information processing device including an imaging device having an imaging lens according to each embodiment.

[0087] Figures 9 to 11 The information processing device 30 shown includes at least an imaging device 31 , a signal processing unit 32 , an image processing unit 33 , a control unit 34 , a display unit 35 , a storage unit 36 ​​, a communication unit 37 , an input unit 38 , and a sound input / output unit 39 .

[0088] The imaging device 31 generates an imaging signal by imaging a predetermined visual field area under the control of the control unit 34, and outputs the imaging signal to the signal processing unit 32. Fig.10 As shown, the imaging device 31 includes at least a cover 311, the imaging lens 100 of each embodiment, and an individual imaging element 312. The imaging device 31 is configured on the front side of the information processing device 30. Specifically, the imaging device 31 is configured at a position where the user of the information processing device 30 can be photographed. Of course, the configuration position of the imaging device 31 can be appropriately changed according to the shape, size, and usage of the information processing device 30.

[0089] The cover 311 is formed using a cover glass or the like which is a member for preventing dirt and dust from forming on the imaging lens 100. The information processing device 30 may further include a lid or the like on the cover 311 which is opened and closed in accordance with a user's operation.

[0090] The individual imaging element 312 receives the image of the imaging object obtained by imaging the imaging lens 100, and generates an imaging signal by performing photoelectric conversion. The individual imaging element 312 is configured using a CCD sensor, a CMOS sensor, etc. The individual imaging element 312 is preferably formed by arranging effective pixels of 8 million pixels or more, that is, so-called 4K or more (3840×2160 or more) in a two-dimensional matrix.

[0091] The signal processing unit 32 performs A / D conversion processing on the imaging signal input from the individual imaging element 312 under the control of the control unit 34, converts the imaging signal into a digital imaging signal, and outputs the digital imaging signal to the image processing unit 33. The signal processing unit 32 is configured using, for example, a DSP (Digital Signal Processor).

[0092] The image processing unit 33 performs predetermined image processing on the digital imaging signal input from the signal processing unit 32 under the control of the control unit 34, and outputs the signal to the display unit 35 or the storage unit 36. The image processing unit 33 is configured using, for example, a GPU (Graphics Processing Unit). Here, the predetermined image processing refers to electrical correction processing of shading, white balance adjustment processing, trimming processing of the center of the image, and noise reduction processing.

[0093] The control unit 34 controls each unit constituting the information processing device 30. The control unit 34 includes a processor and a memory. The processor is constituted using a CPU, an FPGA (Field-Programmable Gate Array), etc. The memory is constituted using a RAM (Random Access Memory), a ROM (Read Only Memory), etc.

[0094] The display unit 35 displays, under the control of the control unit 34 , the dynamic image being shot and image-processed by the image processing unit 33 , the captured camera image, the still image corresponding to the image signal stored in the storage unit 36 ​​, and various information related to the information processing device 30 .

[0095] The storage unit 36 ​​stores various information related to the information processing device 30, programs executed by the information processing device 30, and image signals (RAW data, JPEG data) obtained by the image pickup device 31. The storage unit 36 ​​is configured using a flash memory, an SSD (Solid State Drive), an HDD (Hard Disk Drive), a memory card, and the like.

[0096] The communication unit 37 transmits the image signal captured by the image capturing device 31 to the outside via the network according to the prescribed communication standard under the control of the control unit 34, and receives various information input from the outside. The communication unit 37 uses a communication standard based on, for example, 3GPP (registered trademark), 4G, LTE, 5G, WiMAX, and Wi-Fi (registered trademark) established by IEEE.

[0097] The input unit 38 receives an operation input from the user, and outputs operation information corresponding to the received operation to the control unit 34. The input unit 38 is configured using, for example, a touch panel, a keyboard, a mouse, or the like.

[0098] The sound input / output unit 39 receives input of external sound, converts it into a sound signal, and outputs it to the storage unit 36 ​​or the communication unit 37 under the control of the control unit 34. In addition, the sound input / output unit 39 converts the sound signal input from the storage unit 36 ​​or the communication unit 37 and outputs it to the outside under the control of the control unit 34. The sound input / output unit 39 is configured using a microphone, a speaker, and the like.

[0099] The information processing device 30 configured in this manner can communicate with external equipment using the imaging device 31 having the imaging lens 100 at a high image quality of 4K by means of Web communication via a network.

[0100] In addition, in the embodiment, a PC is used as an example of the information processing device 30, but the camera device 31 can also be applied to a camera device such as a tablet terminal, a mobile phone, etc. Of course, the camera device 31 can also be applied to a web camera that can communicate with a PC or the like by wire or wirelessly.

[0101] According to the above-described embodiments, it is possible to realize a compact imaging device having a wide viewing angle, brightness, and high performance.

[0102] Furthermore, according to the embodiment, a half viewing angle of 50° or more and 60° or less can be realized by five lenses.

[0103] Furthermore, according to the embodiment, the imaging lens 100 can be a high-performance and compact imaging device with a wide angle of view and a small F number, so that when shooting moving images, it can cope with shooting in various environments such as dark environments and increase the shooting speed.

[0104] In addition, according to the embodiment, a wide viewing angle, bright, high-performance and compact imaging device can be realized, so that the matching between the incident angle in the light receiving element of the individual imaging element and the light incident on the light receiving surface can be improved on the image side.

[0105] In addition, according to the embodiment, it is possible to use five lenses to form a bright, high-performance and compact half-viewing angle of more than 50°, so that it can be used as a single-focus lens used in mobile phones such as smartphones and PCs. Therefore, in the case of dynamic image shooting requiring a high pixel count of 4K or more (3840×2160 or more), compared with existing camera lenses, sufficient aberration correction can be performed and the required performance can be met.

[0106] In addition, according to the embodiment, a bright, high-performance and compact half-angle lens of 50° or more can be formed by using five lenses, so the total length of the optical axis direction of the imaging lens 100 can be shortened, and the lens diameter is also reduced, so that miniaturization can be achieved, so the refractive power of the miniaturized lens is reduced, and the influence of manufacturing errors and assembly errors can be reduced. As a result, productivity can be improved and production costs can be suppressed.

[0107] In addition, various inventions can be formed by appropriately combining multiple components disclosed in the information processing device involved in the embodiments of the present disclosure. For example, several components can be deleted from all the components recorded in the information processing device involved in the above-mentioned embodiments of the present disclosure. In addition, the components described in the information processing device involved in the above-mentioned embodiments of the present disclosure can also be appropriately combined.

[0108] In the information processing device according to the embodiment of the present disclosure, the above-mentioned "unit" can be replaced by "means", "circuit", etc. For example, the control unit can be replaced by a control unit or a control circuit.

[0109] In addition, the program executed by the information processing device involved in the embodiments of the present invention is provided in the form of file data in an installable or executable form recorded on a computer-readable recording medium such as a CD-ROM, floppy disk (FD), CD-R, DVD (Digital Versatile Disk), USB medium, flash memory, etc.

[0110] Furthermore, the program executed by the information processing device according to the embodiment of the present disclosure may be stored in a computer connected to a network such as the Internet and provided by being downloaded via the network.

[0111] [Example]

[0112] Hereinafter, Examples 1 to 4 of the imaging lens 100 corresponding to Embodiments 1 to 4, respectively, will be described.

[0113] The meanings of the symbols in the examples are as follows.

[0114] f: focal length of the entire lens system

[0115] Lensf: Focal length of each lens

[0116] Groupf: Focal length of each group

[0117] FNo.: Numerical aperture (F number)

[0118] R: radius of curvature of the surface

[0119] D: Surface spacing

[0120] Nd: refractive index for d-line

[0121] Vd: Abbe value for d-line

[0122] IP: Inflection Point

[0123] The inflection point indicates the position of the inflection point when the effective radius is 1.0. For example, if it is "0.6", it means that the inflection point exists at a position of 60% of the effective radius.

[0124] In addition, "- (hyphen)" indicates that there is no inflection point within the effective diameter. In addition, the case where the inflection point is outside the effective diameter is also indicated by "-".

[0125] TP: Non-uniform thickness ratio (Thickness Point = peripheral wall thickness / center wall thickness)

[0126] The uneven thickness ratio is a ratio of the peripheral wall thickness to the central wall thickness. For example, "1.5" means that the peripheral wall thickness is 1.5 times the central wall thickness.

[0127] When the depth in the optical axis direction is set to X, the height from the optical axis is set to H, the near-axis curvature radius is set to R, the cone constant is set to k, and the high-order aspheric coefficient is set to CN (N=an even number greater than 4), the aspheric coefficient is used to represent the aspheric surface by the well-known following formula (12).

[0128] X=(H 2 / R) / [1+{1-k(H / r) 2} 1 / 2 ]

[0129] +Σ N＝4:even CNH N ···(12)

[0130] Here, Σ N≥4:even It refers to the sum of even numbers where N is 4 or more.

[0131] [Example 1]

[0132] f=1.3mm, FNo.=2.0, HFOV=51°

[0133] Table 1 shows the data of Example 1.

[0134]

Table 1

[0135]

[0136] The data of the aspherical surface are shown below.

[0137]

Table 2

[0138]

[0139] According to the above description of aspherical surface, for example, "8.077E-03" means "8.077*10 ―3 The same is true in the following other embodiments.

[0140] The values ​​of the parameters of each condition are as follows.

[0141]

Table 3

[0142] Numeric f1 -11.39 f5 -1.13 G2 1.36 N1 1.51 N5 1.65 F 1.35 OAL 3.59 SDo 2.40 f4 0.89 f5 -1.13 EXP -1.84 IH 1.62 ENP_D 0.67

[0143]

Table 4

[0144] condition Lower limit Upper limit Numeric (1) f1 / f5 2 10.5 10.0 (2) |f1 / G2| 2.5 9 8.4 (3) N1<N5 Refer to Table 3 (4) N1 1.49 1.55 1.5094 (5) N5 1.63 1.67 1.6497 (6) f / OAL 0.25 0.45 0.4 (7) OAL / SDo 1.2 1.6 1.5 (8) |f4 / f5| 0.5 0.9 0.8 (9) EPX / IH -2 -1 -1.1 (10) SDo / ENP_D 3.5 5.5 3.6 (11) OAL / (2*IH) 1 1.2 1.11

[0145] In each example, an aspherical surface is used in the first lens L1 to the fifth lens L5, and aberrations are corrected well by the aspherical surface.

[0146] Figure 2 Aberration diagrams related to the above-mentioned Example 1 are shown, and it can be seen from each aberration diagram that the performance is good.

[0147] [Example 2]

[0148] f=1.2mm, FNo.=2.0, HFOV=54°

[0149] Table 5 shows the data of Example 2.

[0150]

Table 5

[0151]

[0152] The data of the aspherical surface are shown below.

[0153]

Table 6

[0154]

[0155] The values ​​of the parameters of each condition are as follows.

[0156]

Table 7

[0157] Estimation f1 -9.98 f5 -1.20 G2 1.20 N1 1.51 N5 1.66 F 1.17 OAL 3.40 SDo 2.48 f4 0.84 f5 -1.20 EXP -1.99 IH 1.62 ENP_D 0.59

[0158]

Table 8

[0159] condition Lower limit Upper limit Numeric (1) f1 / f5 2 10.5 8.3 (2) |f1 / G2| 2.5 9 8.3 (3) N1<N5 Refer to Table 7 (4) N1 1.49 1.55 1.5094 (5) N5 1.63 1.67 1.6606 (6) f / OAL 0.25 0.45 0.3 (7) OAL / SDo 1.2 1.6 1.4 (8) |f4 / f5| 0.5 0.9 0.7 (9) EPX / IH -2 -1 -1.2 (10) SDo / ENP_D 3.5 5.5 4.2 (11) OAL / (2*IH) 1 1.2 1.05

[0160] Figure 4 These aberration diagrams are shown, and it can be seen from each aberration diagram that the performance is good.

[0161] [Example 3]

[0162] f=1.1mm, FNo.=2.0, HFOV=56°

[0163] Table 9 shows the data of Example 3.

[0164]

Table 9

[0165]

[0166] The data of the aspherical surface are shown below.

[0167]

Table 10

[0168]

[0169] The parameter values ​​for each condition are as follows.

[0170]

Table 11

[0171] Numeric f1 -6.41 f5 -0.97 G2 1.13 N1 1.54 N5 1.66 F 1.09 OAL 3.40 SDo 2.55 f4 0.75 f5 -0.97 EXP -1.90 IH 1.62 ENP_D 0.55

[0172]

Table 12

[0173] condition Lower limit Upper limit Numeric (1) f1 / f5 2 10.5 6.6 (2) |f1 / G2| 2.5 9 5.7 (3) N1<N5 Refer to Table 11 (4) N1 1.49 1.55 1.5350 (5) N5 1.63 1.67 1.6606 (6) f / OAL 0.25 0.45 0.3 (7) OAL / SDo 1.2 1.6 1.3 (8) |f4 / f5| 0.5 0.9 0.8 (9) EPX / IH -2 -1 -1.2 (10) SDo / ENP_D 3.5 5.5 4.7 (11) OAL / (2*IH) 1 1.2 1.05

[0174] Figure 6 These aberration diagrams are shown, and it can be seen from each aberration diagram that the performance is good.

[0175] [Example 4]

[0176] f=1.0mm, FNo.=2.0, HFOV=60°

[0177] Table 13 shows the data of Example 4.

[0178]

Table 13

[0179]

[0180] The data of aspheric surfaces are shown below

[0181]

Table 14

[0182]

[0183] The values ​​of the parameters of each condition are as follows.

[0184]

Table 15

[0185] Numeric f1 -2.95 f5 -1.33 G2 1.03 N1 1.50 N5 1.66 F 0.96 OAL 3.43 SDo 2.61 f4 0.86 f5 -1.33 EXP -2.48 IH 1.62 ENP_D 0.48

[0186]

Table 16

[0187] condition Lower limit Upper limit Numeric (1) f1 / f5 2 10.5 2.2 (2) |f1 / G2| 2.5 9 2.9 (3) N1<N5 Refer to Table 15 (4) N1 1.49 1.55 1.4971 (5) N5 1.63 1.67 1.6606 (6) f / OAL 0.25 0.45 0.3 (7) OAL / SDo 1.2 1.6 1.3 (8) |f4 / f5| 0.5 0.9 0.6 (9) EPX / IH -2 -1 -1.5 (10) SDo / ENP_D 3.5 5.5 5.4 (11) OAL / (2*IH) 1 1.2 1.06

[0188] Figure 8 These aberration diagrams are shown, and it can be seen from each aberration diagram that the performance is good.

[0189] Above, as in Examples 1 to 4 and Figure 2 , Figure 4 , Figure 6 as well as Figure 8 As shown, the camera lens 100 of the present disclosure is bright, high-performance, and compact (shortened relative to the optical axis direction), and achieves a half viewing angle of more than 50° through a 5-lens structure. In addition, it is obviously suitable as a camera device, especially a camera device for a laptop PC.

[0190] As mentioned above, several embodiments of the present application have been described in detail based on the drawings, but these are merely examples, and the present invention can be implemented in other ways obtained by various modifications and improvements based on the knowledge of those skilled in the art, starting with the methods described in the disclosure column of the present invention.

Claims

1. A camera lens having: The first to fifth lenses are arranged in order from the object side to the image side; and The aperture stop is disposed between the first lens and the second lens. The first lens is a negative lens whose image side surface is concave and has an inflection point at the periphery. The second lens is a positive lens whose image side surface is a convex surface with a strong curvature. The third lens is a negative lens having a concave surface on the object side. The fourth lens is a positive lens whose image side surface is a convex surface with a strong curvature. The fifth lens is a negative lens whose object-side surface is convex and has an inflection point at the periphery, and whose image-side surface is concave and has an inflection point at the periphery. When the focal length of the entire system is set to F, the focal length of the first lens is set to f1, the focal length of the fifth lens is set to f5, and the combined focal length of the lens on the image side from the aperture stop is set to G2, conditions (1) and (2) are satisfied. 2.0<f1 / f5<10.5···(1) 2.5<|f1 / G2|<9.0···(2).

2. The imaging lens according to claim 1, wherein: When the refractive index of the material of the first lens with respect to the d-line is N1 and the refractive index of the material of the fifth lens with respect to the d-line is N5, condition (3) is satisfied. N1<N5···(3).

3. The imaging lens according to claim 1, wherein: The refractive index N1 of the material of the first lens for d-line satisfies condition (4). 1.49＜N1＜1.55···(4)。 4. The imaging lens according to claim 1, wherein: The refractive index N5 of the material of the fifth lens for d-line satisfies condition (5). 1.63＜N5＜1.67···(5)。 5. The imaging lens according to claim 1, wherein: When the focal length of the entire optical system is denoted by f and the total length of the optical system is denoted by OAL, condition (6) is satisfied. 0.25<f / OAL<0.45···(6).

6. The imaging lens according to claim 1, wherein: When the total length of the optical system is represented by OAL and the optical effective diameter of the lens arranged closest to the object is represented by SDo, condition (7) is satisfied. 1.2<OAL / SDo<1.6···(7).

7. The imaging lens according to claim 1, wherein: When the focal length of the fourth lens is set to f4 and the focal length of the fifth lens is set to f5, condition (8) is satisfied. 0.5<|f4 / f5|<0.9···(8).

8. The imaging lens according to claim 1, wherein: When the exit pupil position is set to EXP and the image height is set to IH, condition (9) is satisfied. -2.0<EXP / IH<-1.0···(9).

9. The imaging lens according to claim 1, wherein: When the optical effective diameter of the lens closest to the object side is denoted as SDo and the entrance pupil diameter of the optical system is denoted as ENP_D, condition (10) is satisfied. 3.5<SDo / ENP_D<5.5···(10).

10. The imaging lens according to claim 1, wherein: When the total optical length is set to OAL and the image height is set to IH, condition (11) is satisfied. 1.0<OAL / (2*IH)<1.2···(11).

11. A camera device comprising: The camera lens according to claim 1; and The individual imaging element receives the image formed by the imaging lens and generates an imaging signal.

12. An information processing device comprising: The imaging device according to claim 11; and The display unit displays an image corresponding to the imaging signal generated by the imaging device.

Images