Imaging lens, imaging device, and information processing device

Abstract

Provided are an imaging lens, an imaging device, and an information processing device which are capable of having a wide angle of view, and which are bright, high-performance, and compact. An imaging lens (100) is provided with first to fifth lenses (L1 to L5) arranged in this order from the object side. The first lens (L1) is a positive lens having a convex surface facing the object side, the second lens (L2) is a lens having a concave surface facing the image surface side, the third lens (L3) is a positive or negative lens having an inflection point on at least one surface and having a small deviation ratio, and the fourth lens (L4) is a positive lens having a convex surface facing the image surface side and having an inflection point on the surface of the object side at the periphery of the lens. The fifth lens (L5) is a negative lens having a concave image surface side and an inflection point at a peripheral portion.

Description

Technical Field

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

[0002] In recent years, photographing devices such as digital cameras, digital video cameras, and cameras for smartphones, which include a single photographing element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) and a photographing lens, have become widespread.

[0003] The high pixel count of the single photographing elements used in these photographing devices has been continuously developed. Along with the high pixel count of the single photographing element, higher optical performance has also been required for the photographing lens.

[0004] In addition, in recent years, in a PC (Personal Computer) equipped with a photographing device, video is distributed and communicated via the Web. Therefore, in the photographing device, miniaturization considering portability has also been achieved. The photographing devices required in the market are mainly devices that combine high performance and miniaturization, and for the photographing lens, not only high performance but also miniaturization is required. Therefore, there is known a photographing lens that achieves both high performance and miniaturization (for example, refer to Patent Document 1 and Patent Document 2).

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

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2015-106155.

[0007] However, in recent years, when distributing and communicating video via the Web, it is desired to be able to photograph with a wider field of view angle than conventional photographing lenses. Therefore, a photographing lens with a wider field of view angle than conventional photographing lenses, and that is bright, high performance, and small is desired. Summary of the Invention

[0008] The present disclosure has been made in view of the above, and an object thereof is to provide a photographing lens, a photographing device, and an information processing device with a wide field of view angle, and that are bright, high performance, and small.

[0009] In order to solve the above problems and achieve the object, the imaging lens according to the first aspect of the present disclosure includes a first lens to a fifth lens arranged in order from the object side. The first lens is a positive lens with a convex surface facing the object side, the second lens is a lens with a concave surface facing the image side, the third lens is a positive lens or a negative lens having an inflection point on at least one surface and a small deviation ratio, the fourth lens is a positive lens with a convex surface facing the image side and having an inflection point at the lens peripheral portion on the object side, and the fifth lens is a negative lens with a concave surface on the image side and having an inflection point at the peripheral portion. The first lens and the second lens are joined. When the combined focal length of the first lens and the second lens is set as f12, the focal length of the fifth lens is set as f5, and the focal length of the entire optical system is set as f, the conditions (1) and (2) are satisfied:

[0010] 0.50 < |f / f12| < 0.65…(1)

[0011] 0.30 < |f5 / f12| < 0.50…(2).

[0012] In addition, the imaging device according to the second aspect of the present disclosure includes the above-described imaging lens and a single imaging element that receives the image formed by the imaging lens and generates an imaging signal.

[0013] In addition, the information processing device according to the third aspect of the present disclosure includes the above-described imaging device and a display unit that displays an image corresponding to the imaging signal generated by the imaging device.

[0014] According to the present disclosure, there is an effect that an imaging lens having a wide field of view angle, being bright, having high performance, and being small-sized can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a diagram showing the lens configuration of the imaging lens according to Embodiment 1 of the present disclosure.

[0016] Figure 2A is an aberration diagram of the imaging lens according to Embodiment 1 of the present disclosure.

[0017] Figure 2B is the MTF of the imaging lens according to Embodiment 1 of the present disclosure.

[0018] Figure 2C is the distortion grid of the imaging lens according to Embodiment 1 of the present disclosure.

[0019] Figure 3 is a diagram showing the lens configuration of the imaging lens according to Embodiment 2 of the present disclosure.

[0020] Figure 4A is an aberration diagram of the imaging lens according to Embodiment 2 of the present disclosure.

[0021] Figure 4B is the MTF of the photographing lens according to Embodiment 2 of the present disclosure.

[0022] Figure 4C is the distortion grid of the photographing lens according to Embodiment 2 of the present disclosure.

[0023] Figure 5 is a diagram showing the lens configuration of the photographing lens according to Embodiment 3 of the present disclosure.

[0024] Figure 6A is the aberration diagram of the photographing lens according to Embodiment 3 of the present disclosure.

[0025] Figure 6B is the MTF of the photographing lens according to Embodiment 3 of the present disclosure.

[0026] Figure 6C is the distortion grid of the photographing lens according to Embodiment 3 of the present disclosure.

[0027] Figure 7 is a diagram showing the lens configuration of the photographing lens according to Embodiment 4 of the present disclosure.

[0028] Figure 8A is the aberration diagram of the photographing lens according to Embodiment 4 of the present disclosure.

[0029] Figure 8B is the MTF of the photographing lens according to Embodiment 4 of the present disclosure.

[0030] Figure 8C is the distortion grid of the photographing lens according to Embodiment 4 of the present disclosure.

[0031] Figure 9 is a diagram showing the lens configuration of the photographing lens according to Embodiment 5 of the present disclosure.

[0032] Figure 10A is the aberration diagram of the photographing lens according to Embodiment 5 of the present disclosure.

[0033] Figure 10B is the MTF of the photographing lens according to Embodiment 5 of the present disclosure.

[0034] Figure 10C is the distortion grid of the photographing lens according to Embodiment 5 of the present disclosure.

[0035] Figure 11 is a diagram showing the lens configuration of the photographing lens according to Embodiment 6 of the present disclosure.

[0036] Figure 12A is the aberration diagram of the photographing lens according to Embodiment 6 of the present disclosure.

[0037] Figure 12B is the MTF of the photographing lens according to Embodiment 6 of the present disclosure.

[0038] Figure 12C is the distortion grid of the photographing lens according to Embodiment 6 of the present disclosure.

[0039] Figure 13 is a diagram showing the lens configuration of the photographing lens according to Embodiment 7 of the present disclosure.

[0040] Figure 14A is the aberration diagram of the photographing lens according to Embodiment 7 of the present disclosure.

[0041] Figure 14B is the MTF of the photographing lens according to Embodiment 7 of the present disclosure.

[0042] Figure 14C is the distortion grid of the photographing lens according to Embodiment 7 of the present disclosure.

[0043] Figure 15 is a diagram showing the lens configuration of the photographing lens according to Embodiment 8 of the present disclosure.

[0044] Figure 16A is the aberration diagram of the photographing lens according to Embodiment 8 of the present disclosure.

[0045] Figure 16B is the MTF of the photographing lens according to Embodiment 8 of the present disclosure.

[0046] Figure 16C is the distortion grid of the photographing lens according to Embodiment 8 of the present disclosure.

[0047] Figure 17 is a diagram showing a schematic configuration of an information processing apparatus of a photographing apparatus including the photographing lens according to each embodiment of the present disclosure.

[0048] Figure 18 is showing Figure 17 the schematic configuration of the photographing apparatus.

[0049] Figure 19 is a block diagram showing a functional configuration of an information processing apparatus of a photographing apparatus including the photographing lens according to each embodiment of the present disclosure.

[0050] 30... information processing apparatus, 31... photographing apparatus, 100... photographing lens, L1... first lens, L2... second lens, L3... third lens, L4... fourth lens, L5... fifth lens, S... aperture stop, CG... glass cover. Detailed Embodiments

[0051] Hereinafter, the photographing lens, the photographing apparatus, and the information processing apparatus of the present disclosure will be described with reference to the drawings. In addition, the present disclosure is not limited by the following embodiments. In the following description, each of the drawings referred to schematically shows the shape, size, and positional relationship only to the extent that the content of the present disclosure can be understood. That is, the present disclosure is not limited only to the shape, size, and positional relationship illustrated in each drawing. In addition, the same reference numerals are added to the same parts and detailed descriptions are omitted.

[0052] [Embodiment]

[0053] Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 are cross-sectional views showing the lens configurations of the photographing lenses of Embodiments 1 to 8, respectively. In each cross-sectional view, the left side is the object side (front), and the right side is the image side (rear).

[0054] The photographing 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. In addition, the photographing lens 100 includes an aperture stop S (STOP) arranged on the object side compared to the first lens L1 (Embodiments 1 to 4), and an aperture stop S arranged between the second lens L2 and the third lens L3 (Embodiments 5 to 8).

[0055] In addition, in Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 , the reference numerals 1 to 10 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 aperture stop. Hereinafter, these surfaces will be referred to as surfaces 1 to 10 in order from the object side to the image side. Surface 1 is the surface of the aperture stop S. And in Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 13 and Figure 15 , the reference numeral CG represents a transparent parallel plate equivalent to a component composed of at least one of the cover glass of a single photographing element and various optical filters. The incident side surface of the transparent parallel plate CG is referred to as surface 11, and the image side surface is referred to as surface 12.

[0056] The photographing lens 100 is configured with a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the side closest to the object. The first lens L1 is a positive lens. The second lens L2 is a negative or positive lens. The third lens is a lens having positive or negative power. The fourth lens is a positive lens. The fifth lens is a negative lens. That is, the photographing lens 100 is composed of the first lens L1 to the fifth lens L5. In addition, the photographing lens 100 is formed by joining the first lens and the second lens L2. In addition, the material of the first lens L1 is glass, and the second lens L2 is formed of plastic, and it is a so-called hybrid lens.

[0057] A hybrid lens is a lens that joins glass and plastic, and the glass lens is composed of a spherical lens as in each embodiment. As an advantage of glass, the transmittance is better than that of plastic. In recent years, even with glass molding technology, it is possible to mold a glass material with an aspherical surface, but the cost is high, and there are also restrictions on the molding conditions, so it has not been adopted in the lenses for PC cameras that require mass production. Therefore, by using a hybrid lens, there is a cost advantage, and in addition, it is possible to realize a camera lens for PC with higher transmittance and higher performance than plastic.

[0058] In addition, the first lens L1 is a spherical lens, and the second lens L2 is a combination of aspherical surfaces. However, by making both surfaces of the first lens L1 aspherical as in Embodiment 8, aberration correction can be further performed.

[0059] By adopting a hybrid lens like this, axial chromatic aberration can be highly corrected, so the MTF of the central image height can be improved. In addition, with respect to astigmatism, it can be corrected by the aspherical surface of the second lens L2.

[0060] The first lens L1 is composed of a positive lens with the convex surface facing the object side. The material is a glass material. In addition, although it is composed of a spherical lens, it can also be an aspherical lens.

[0061] The second lens L2 is composed of a positive or negative lens, but is made of plastic with an aspherical surface. Considering the error sensitivity of the aspherical surface, it is preferable to weaken the power of the lens for the power of the second lens L2, but this is not all. In addition, the first lens L1 and the second lens L2 are joined.

[0062] The third lens L3 is composed of a positive lens or a negative lens having an inflection point on at least one surface and a small deviation ratio.

[0063] The fourth lens L4 is composed of a positive lens with the convex surface facing the image side and having an inflection point at the lens peripheral portion of the surface on the object side.

[0064] The fifth lens L5 is composed of a negative lens with the image side being concave and having an inflection point at the peripheral portion.

[0065] The first lens L1 among the first lens L1 to the fifth lens L5 configured like this is made of glass, and L2 to L5 are aspherical lenses formed by plastic. The aperture stop S is arranged closest to the object side, between the second lens L2 and the third lens L3, or between the first lens L1 and the second lens L2. In addition, the first lens L1 and the second lens L2 are joined and are hybrid aspherical lenses. By making the first lens L1 and the second lens L2 hybrid aspherical, it is possible to highly correct aberration in a state where the thickness (overall length) in the light direction of the photographing lens 100 is thinned.

[0066] In addition, regarding the materials of the lenses, as shown in each embodiment, except for the first lens L1 - the second lens L2 of the hybrid lens, an optical plastic material is used for the third lens L3 to the fifth lens L5.

[0067] Figures 2A - 2C 、 Figures 4A - 4C 、 Figures 6A - 6C 、 Figures 8A - 8C 、 Figures 10A - 10C 、 Figures 12A - 12C 、 Figures 14A - 14C and Figures 16A - 16C are the longitudinal aberration diagrams, MTFs, and distortion grids of the photographing lenses 100 of Embodiments 1 to 8, respectively. In the spherical aberration diagrams, the spherical aberration amounts for the d-line (yellow: wavelength 587.6 nm), g-line (blue: wavelength 435.8 nm), and C-line (red: 653.3 nm) are shown, respectively. In addition, in the astigmatism diagram, the solid line S represents the astigmatism amount on the sagittal image plane, and the dashed line T represents the astigmatism amount on the tangential image plane. And, in the distortion aberration diagram, only the distortion aberration amount for the d-line is shown. In addition, Angle (deg) represents the photographing half field angle (°). In addition, in the MTF, at frequencies of 1 / 4Ny and 1 / 2Ny, the 5-dot dash line represents the MTF of the sagittal image plane at 1 / 4Ny, the thick dashed line represents the MTF of the tangential image plane at 1 / 4Ny, the 3-dot dash line represents the MTF of the sagittal image plane at 1 / 2Ny, and the thin dashed line represents the MTF of the tangential image plane at 1 / 2Ny. In addition, regarding the distortion grid, the thin line represents the paraxial (Paraxial FOV) (ideal) grid, and the thick line represents the real (Actual FOV) (actual) grid.

[0068] Next, the conditions of the photographing lens 100 of each embodiment will be described.

[0069] When the focal length of the first lens L1 is set to f1, the focal length of the fourth lens L4 is set to f4, and the focal length of the entire optical system is set to f in the photographing lens 100 of each embodiment, the following conditions (1) and (2) are satisfied.

[0070] (1) 0.50 < |f / f12| < 0.65

[0071] (2) 0.30 < |f5 / f12| < 0.50

[0072] Condition (1) is a conditional expression related to the overall focal length of the photographing lens 100 and the lens powers of the first lens L1 and the second lens L2.

[0073] When f / f12 is below the lower limit of condition (1), there is a tendency for the overall focal length to become shorter, so it is advantageous for wider angle, but since astigmatism becomes excessive and distortion aberration also becomes larger, it is difficult to achieve the desired performance. In addition, when f / f12 is above the upper limit of condition (1), there is a tendency to improve spherical aberration and astigmatism, but since the field angle becomes narrow, the desired performance of each embodiment cannot be achieved, so it is not preferred. Therefore, by satisfying condition (1), the photographing lens 100 can achieve a balance between short form (low profile) and high performance.

[0074] Condition (2) is a conditional expression related to the positive power of the first lens L1 and the second lens L2 and the negative power of the fifth lens L5.

[0075] When |f5 / f12| is below the lower limit of condition (2), astigmatism is excessive and spherical aberration is also generated relatively largely, so it is difficult to achieve the desired performance. In addition, when |f5 / f12| is above the upper limit of condition (2), spherical aberration is too small, so the balance with astigmatism is broken and it is difficult to achieve the desired performance.

[0076] That is, by satisfying condition (1) and condition (2), the photographing lens 100 can achieve a balance between spherical aberration and astigmatism, and realize a bright, high-performance and small (compact) photographing lens 100. Here, small means reducing the thickness by shortening the overall length of the photographing lens 100 in the optical axis direction and reducing the aperture of the photographing lens 100.

[0077] In addition, when the refractive index of the material of the first lens L1 for the d line is set to N1 and the refractive index of the material of the fifth lens L5 for the d line is set to N5 in the photographing lens 100 of each embodiment, condition (3) is satisfied.

[0078] N1 < N5... (3)

[0079] Condition (3) is a condition that 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.

[0080] The first lens L1 is a positive lens, and further, the fifth lens L5 is a negative lens. In each embodiment, in order to make the chromatic aberration appropriate and balance miniaturization, it is formed of a material having a refractive index such that the refractive index N1 of the first lens L1 is smaller than the refractive index N5 of the fifth lens L5, and satisfies condition (3), thereby enabling the desired good chromatic aberration to be achieved.

[0081] Further, the imaging lens 100 of each embodiment satisfies condition (4) when the refractive index of the material of the first lens L1 with respect to the d-line is set to N1.

[0082] 1.49 < N1 < 1.55…(4)

[0083] When the refractive index N1 is below the lower limit of condition (4), the optical performance is further improved, but the cost becomes high, so it is not preferable. Further, when the refractive index N1 is above the upper limit of condition (4), since the optical performance affects the chromatic aberration, it is not preferable. Thus, by making the imaging lens 100 satisfy condition (4), the balance between cost and chromatic aberration is achieved, and a bright, high-performance, and small (compact) imaging lens 100 can be realized.

[0084] Further, the imaging lens 100 of each embodiment satisfies condition (5) when the refractive index of the material of the fifth lens L5 with respect to the d-line is set to N5.

[0085] 1.63 < N5 < 1.67…(5)

[0086] 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 broken. Considering the balance between cost and chromatic aberration, by satisfying condition (5), a bright, high-performance, and small imaging lens 100 can be realized.

[0087] Further, the imaging lens 100 of each embodiment satisfies condition (6) when the focal length of the entire optical system (imaging lens 100) is set to f and the overall length of the optical system (long side direction of the imaging lens 100) is set to OAL.

[0088] 0.60 < f / OAL < 0.70…(6)

[0089] Condition (6) is a condition for achieving the balance between the focal length f of the entire optical system and the overall length OAL.

[0090] In the photographing lens 100 of each embodiment, when f / OAL is below the lower limit of condition (6), further wide-angleization can be achieved, but there is a tendency for the front spherical diameter to increase, so there is a concern about an increase in size. On the other hand, when f / OAL is above the upper limit of condition (6), the overall length of the optical system becomes smaller, but it is difficult to widen the field angle. The photographing lens 100 that satisfies condition (6) can achieve miniaturization of size and wide-angleization of the field angle.

[0091] In addition, in the photographing lens 100 of each embodiment, when the overall length of the optical system is set to OAL and the effective optical diameter of the lens (first lens L1) disposed closest to the object side is set to EfD1, condition (7) is satisfied.

[0092] 2.1 < OAL / EfD1 < 3.3…(7)

[0093] Condition (7) is a condition for achieving a balance between the overall length of the lens and the front spherical diameter of the lens (first lens L1).

[0094] When OAL / EfD1 is below the lower limit of condition (7), miniaturization of the optical system (shortening in the optical axis direction) is achieved, but it is difficult to achieve a wide field angle. When OAL / EfD1 is above the upper limit of condition (7), the performance of the optical system is improved, but it is difficult to achieve miniaturization (shortening in the optical axis direction). The photographing lens 100 can achieve miniaturization (shortening in the optical axis direction) and high performance by satisfying condition (7).

[0095] In addition, in the photographing lens 100 of each embodiment, when the exit pupil position is set to EXP and the image height is set to IH, condition (8) is satisfied.

[0096] -0.98 < EXP / IH <-0.70…(8)

[0097] Condition (8) is a condition for optimizing the light incident angle on the image plane.

[0098] When EXP / IH is below the lower limit of condition (8), there is a tendency for the light incident angle to become lower, but there is a tendency for it to be difficult to shorten the overall length of the optical system to miniaturize it. On the other hand, when EXP / IH is above the upper limit of condition (8), there is a tendency for the light incident angle to become higher. Therefore, the photographing lens 100 can achieve miniaturization by satisfying condition (8).

[0099] In addition, in the photographing lens 100 of each embodiment, when the combined focal length of the first lens and the second lens is set to f12 and the focal length of the third lens is set to f3, condition (9) is satisfied.

[0100] 0.01 < |f12 / f3| < 0.30…(9)

[0101] Condition (9) is a condition related to the balance of the focal lengths of the first lens L1 and the second lens L2.

[0102] When |f12 / f3| is below the lower limit of condition (9), the lens power of f3 is weaker than the combined power of f1 and f2, so spherical aberration and distortion aberration are likely to become insufficiently corrected, making it difficult to achieve high performance. Additionally, when |f12 / f3| is above the upper limit of condition (9), astigmatism is likely to increase, so this is not preferred. Therefore, the imaging lens 100 can achieve high performance by satisfying condition (9).

[0103] Furthermore, for the imaging lens 100 of each embodiment, when the combined focal length of the first lens L1 and the second lens L2 is set as f12 and the focal length of the fourth lens L4 is set as f4, condition (10) is satisfied.

[0104] 0.30 < f4 / f12 < 0.40…(10)

[0105] Condition (10) is a conditional expression related to the positive power after combination of the first lens L1 and the second lens L2 and the positive power of the fourth lens L4.

[0106] When f4 / f12 is below the lower limit of condition (10), astigmatism tends to be excessive, and distortion aberration and coma aberration are also generated to a large extent, making it difficult to achieve the desired performance. Additionally, when f4 / f12 is above the upper limit of condition (10), spherical aberration tends to be too small, so the balance with astigmatism is broken, making it difficult to achieve the desired performance.

[0107] Furthermore, for the imaging lens 100 of each embodiment, when the focal length of the fourth lens L4 is set as f4 and the focal length of the fifth lens L5 is set as f5, condition (11) is satisfied.

[0108] 0.75 < |f4 / f5| < 0.95…(11)

[0109] Condition (11) is a conditional expression related to the lens power of the fourth lens L4 and the lens power of the fifth lens L5.

[0110] When f4 / f5 is below the lower limit of condition (11), astigmatism tends to become excessive and distortion aberration also tends to increase, so it is difficult to achieve the desired performance. Further, when f4 / f5 is above the upper limit of condition (11), the overall focal length increases and the field angle tends to be a narrow angle, so there is a tendency to improve astigmatism and distortion aberration, but since spherical aberration tends to increase, it is difficult to achieve the desired performance. Therefore, by satisfying condition (11), the photographing lens 100 can achieve a balance between short-sizing (low-profile) and high performance.

[0111] 〔Photographing device〕

[0112] Next, an embodiment of an information processing device (PC) having a photographing device using the photographing lens 100 of each embodiment as a photographing optical system will be described.

[0113] Figure 17 FIG. is a diagram showing a schematic configuration of an information processing device having a photographing device including the photographing lens 100 of each embodiment. Figure 18 It shows Figure 17 of the schematic configuration of the photographing device. Figure 19 FIG. is a block diagram showing a functional configuration of an information processing device having a photographing device including the photographing lens of each embodiment.

[0114] Figures 17 - 19 The information processing device 30 shown includes at least a photographing 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 voice input / output unit 39.

[0115] Under the control of the control unit 34, the photographing device 31 generates a photographing signal by photographing a prescribed field region and outputs the photographing signal to the signal processing unit 32. As Figure 18 shown, the photographing device 31 includes at least a cover 311, the photographing lens 100 of each embodiment, and a single photographing element 312. The photographing device 31 is disposed on the front side of the information processing device 30. Specifically, the photographing device 31 is disposed at a position where a user of the information processing device 30 can be photographed. Of course, the arrangement position of the photographing device 31 can be appropriately changed according to the shape, size, and usage mode of the information processing device 30.

[0116] The cover 311 is constituted by a glass cover or the like as a member for preventing dirt and dust on the photographing lens 100. Further, the information processing device 30 may further provide a cover or the like that opens and closes according to a user operation to the cover 311.

[0117] The single imaging element 312 receives the image of the object to be imaged by the imaging lens 100 and generates an imaging signal through photoelectric conversion. The single imaging element 312 is constituted by a CCD sensor, a CMOS sensor, or the like. Preferably, the single imaging element 312 arranges effective pixels of 8 million pixels or more, so-called 4K or more (3840×2160 or more), in a two-dimensional matrix form.

[0118] Under the control of the control unit 34, the signal processing unit 32 performs A / D conversion processing or the like on the imaging signal input from the single imaging element 312 to convert it into a digital imaging signal and outputs it to the image processing unit 33. For example, the signal processing unit 32 is constituted by a DSP (Digital Signal Processor).

[0119] Under the control of the control unit 34, the image processing unit 33 performs prescribed image processing on the digital imaging signal input from the signal processing unit 32 and outputs it to the display unit 35 or the storage unit 36. For example, the image processing unit 33 is constituted by a GPU (Graphics Processing Unit). Here, the prescribed image processing refers to electrical correction processing of shadows, white balance adjustment processing, trimming processing of the center part of the image, and noise reduction processing, etc.

[0120] 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 by a CPU or an FPGA (Field-Programmable Gate Array), etc. The memory is constituted by a RAM (Random Access Memory) or a ROM (Read Only Memory), etc.

[0121] Under the control of the control unit 34, the display unit 35 displays the video during imaging on which the image processing unit 33 has performed image processing, the captured 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.

[0122] The storage unit 36 stores various information related to the information processing device 30, the programs executed by the information processing device 30, and the imaging signals (RAW data or JPEG data) captured by the imaging device 31. The storage unit 36 is constituted by a flash memory, an SSD (Solid State Drive), an HDD (Hard Disk Drive), and a memory card, etc.

[0123] Under the control of the control unit 34, the communication unit 37 transmits the captured signal captured by the imaging device 31 to the outside via a network according to a specified communication standard, and receives various information input from the outside. The communication unit 37 uses, for example, communication standards based on 3GPP (registered trademark), 4G, LTE, 5G, WiMAX, and Wi-Fi (registered trademark) established by IEEE.

[0124] The input unit 38 accepts the operation input of the user and outputs operation information corresponding to the accepted operation to the control unit 34. The input unit 38 is constituted by, for example, a touch panel, a keyboard, a mouse, etc.

[0125] Under the control of the control unit 34, the audio input / output unit 39 accepts the input of external sound, converts it into an audio signal, and outputs it to the storage unit 36 or the communication unit 37. In addition, under the control of the control unit 34, the audio input / output unit 39 converts the audio signal input from the storage unit 36 or the communication unit 37 and outputs it to the outside. The audio input / output unit 39 is constituted by a microphone and a speaker, etc.

[0126] The information processing device 30 configured as described above can communicate with an external device in high definition of 4K via Web communication via a network using the imaging device 31 having the imaging lens 100.

[0127] In addition, in the embodiment, a PC is described as an example of the information processing device 30, but the imaging device 31 can be applied to, for example, an imaging device of a tablet terminal, a mobile phone, etc. Of course, the imaging device 31 can also be applied to a Web camera, etc. that can communicate with a PC, etc. via wire or wireless.

[0128] According to the embodiment described above, it is possible to realize an information processing device with a wide-angle field of view, bright, high-performance, and small size.

[0129] In addition, according to the embodiment, a semi-field of view of about 50° can be realized by four lenses.

[0130] In addition, according to the embodiment, since the imaging lens 100 can realize a wide-angle field of view, has a small F-number, and is a high-performance and small-sized imaging lens, in the case of video shooting, it is possible to cope with shooting in various environments such as a dark environment, and to increase the shooting speed.

[0131] In addition, according to the embodiment, since it is possible to realize a wide-angle field of view, and a bright, high-performance, and small-sized imaging lens, it is possible to improve the matching of the incident angle and the incident light on the light-receiving element of the single imaging element on the image side.

[0132] In addition, according to the embodiment, since a photographing lens with a bright, high-performance and small size and a half field of view angle of about 50° can be formed by four lenses, it can be used as a single-focus lens for mobile phones such as smart phones and PCs. Therefore, in the case of video shooting requiring a high pixel count of 4K or more (3840×2160 or more), compared with conventional photographing lenses, sufficient aberration correction can be performed, and the required performance can be satisfied.

[0133] In addition, according to the embodiment, since a photographing lens with a bright, high-performance and small size and a half field of view angle of about 50° can be formed by four lenses, the overall length of the optical axis of the photographing lens 100 can be shortened, and the lens diameter can also be reduced, so that miniaturization can be achieved. Therefore, the refractive power of the miniaturized lens becomes smaller, 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.

[0134] In addition, by appropriately combining a plurality of constituent elements disclosed in the information processing apparatus according to the embodiment of the present disclosure, various inventions can be formed. For example, several constituent elements may be deleted from all the constituent elements described in the information processing apparatus according to the embodiment of the present disclosure above. Also, the constituent elements described in the information processing apparatus according to the embodiment of the present disclosure above may be appropriately combined.

[0135] In addition, in the information processing apparatus according to the embodiment of the present disclosure, the above-mentioned "section" can be replaced with "unit" or "circuit", etc. For example, the control section can be replaced with a control unit or a control circuit.

[0136] In addition, the program for causing the information processing apparatus according to the embodiment of the present disclosure to execute is recorded as file data in a format that can be installed or a format that can be executed on a computer-readable recording medium such as a CD-ROM, a floppy disk (FD), a CD-R, a DVD (Digital Versatile Disk), a USB medium, or a flash memory and provided.

[0137] In addition, the program for causing the information processing apparatus according to the embodiment of the present disclosure to execute may be configured to be stored on a computer connected to a network such as the Internet and provided by downloading it via the network.

[0138]

Embodiment

[0139] Hereinafter, Examples 1 to 8 of the photographing lens 100 corresponding to Embodiments 1 to 8 are shown.

[0140] The meanings of the symbols in each example are as follows.

[0141] f: Focal length of the entire lens system

[0142] fl: Focal length of each lens

[0143] FNo.: Numerical aperture (F-number)

[0144] R: Curvature radius of the surface

[0145] D: Spacing between surfaces

[0146] Nd: Refractive index for d-line

[0147] Vd: Abbe number for d-line

[0148] SD: Effective radius

[0149] When the depth in the optical axis direction is set as X, the height from the optical axis is set as H, the paraxial curvature radius is set as R, the conic constant is set as k, and the aspherical coefficient of higher order is set as CN (even number where N ≥ 4), the aspherical surface is represented by the well-known following formula (15) using the aspherical coefficient.

[0150] X = (H 2 / R) / [1 + {1 - k(H / r) 2} 1 / 2 + Σ N＝4:even CNH N …(15)

[0151] Here, Σ N≧4:even means the sum for even numbers where N ≥ 4.

[0152] [Example 1]

[0153] f = 1.9 mm, FNo. = 2.0, HFOV = 47.6°

[0154] The data of Example 1 is shown in Table 1.

[0155]

Table 1

[0156]

[0157] The data of the aspherical surface is as follows.

[0158]

Table 2

[0159] 4 5 6 Conic constant (k) 2.7261.E-01 2.3930.E-01 3.4338.E-01 Fourth - order coefficient 3.6682.E+00 4.1789.E+00 2.9122.E+00 Sixth - order coefficient 3.3129.E+01 -1.5129.E+01 -1.2701.E+01 Eighth - order coefficient -7.1042.E-02 -4.0450.E-01 -1.9071.E-01 Tenth - order coefficient -8.5204.E-01 -3.3744.E-01 -6.2471.E-02 Twelfth - order coefficient 6.2880.E+00 -1.3855.E-01 1.4599.E-03 Fourteenth - order coefficient -3.6156.E+01 -3.8987.E-01 5.2659.E-02 Sixteenth - order coefficient 9.5403.E+01 -9.8805.E-01 8.0976.E-02 Eighteenth - order coefficient -1.0752.E+02 1.8609.E-02 9.5306.E-02 Twentieth - order coefficient 0.0000.E+00 0.0000.E+00 0.0000.E+00

[0160] 7 8 9 10 Conic constant (k) -1.9469.E-01 -1.5453.E+00 1.3189.E+00 2.4811.E+00 Fourth - order coefficient -5.1365.E+00 -6.4713.E-01 7.5820.E-01 4.0305.E-01 Sixth - order coefficient 1.7612.E+01 -2.6574.E+00 -8.8507.E+00 -3.2491.E+00 Eighth - order coefficient 1.3234.E-02 -2.0198.E-01 -1.8942.E-01 -2.1133.E-01 Tenth - order coefficient 1.6646.E-02 -1.1139.E-02 -1.5229.E-01 9.6807.E-02 Twelfth - order coefficient 5.1366.E-02 -1.3766.E-03 2.1911.E-01 -2.1120.E-02 Fourteenth - order coefficient 2.0677.E-02 3.2276.E-03 -8.4669.E-02 -9.6547.E-04 Sixteenth - order coefficient -5.5714.E-03 1.5189.E-02 4.9461.E-03 9.3769.E-04 Eighteenth - order coefficient -1.1916.E-02 2.2810.E-02 1.9110.E-03 -9.5250.E-05 Twentieth - order coefficient 0.0000.E+00 0.0000.E+00 0.0000.E+00 0.0000.E+00

[0161] In the above description of the aspherical surface, for example, "1.9110.E - 03" means "1.9110 * 10 -3 ". The same applies to the following other examples.

[0162] The parameter values for each condition are as follows. In addition, EP: entrance pupil position is also described in Table 3.

[0163]

Table 3

[0164] Item Value f 1.89 Fn0 2.00 OAL 2.79 IH 2.23 EfD1 0.95 Half FOV 47.56 EP 0.00 EXP -2.12 f12 3.48 f3 -15.81 f4 1.29 f5 -1.62 N1 1.5168 N2 1.5200 N3 1.6422 N4 1.5365 N5 1.6422

[0165] In this table, in addition to conditional expressions (1) to (11), (12) to (14) are also described as references.

[0166]

Table 4

[0167] Conditional expression Value Lower limit Upper limit (1) f / f12 0.545 0.5 0.65 (2) |f5 / f12| 0.466 0.3 0.5 (3) N1 < N5 Refer to Table 3 (4) N1 1.517 1.49 1.55 (5) N5 1.642 1.63 1.67 (6) f / OAL 0.678 0.6 0.7 (7) OAL / EfD1 2.948 2.1 3.3 (8) EXP / IH -0.952 -0.98 -0.7 (9) |f12 / f3| 0.220 0.01 0.3 (10) f4 / f12 0.370 0.3 0.4 (11) |f4 / f5| 0.794 0.75 0.95 (12) |f5 / f3| 0.103 0.01 0.15 (13) |f4 / f3| 0.081 0.01 0.17 (14) OAL / 2*IH 0.627 0.61 0.65

[0168] In addition, the meanings of the conditional expressions (12) to (14) are as follows.

[0169] 0.01 < |f5 / f3| < 0.15…(12)

[0170] Regarding conditional expression (12), f3 represents the focal length of the third lens L3, and f5 represents the focal length of the fifth lens L5. It is a condition for the balance of the focal lengths of the third lens L3 and the fifth lens L5. Within the range of conditional expression (12), high performance can be achieved. When it is below the lower limit of the conditional expression, astigmatism becomes large, and when it is above the upper limit of conditional expression (12), spherical aberration becomes large. Therefore, it is preferably within the range that satisfies the conditional expression.

[0171] 0.01 < |f4 / f3| < 0.17…(13)

[0172] Regarding conditional expression (13), f3 represents the focal length of the third lens L3, and f4 represents the focal length of the fourth lens L4. It is a condition for the balance of the focal lengths of the third lens L3 and the fourth lens L4. Within the range of conditional expression (13), high performance can be achieved. When it is below the lower limit of the conditional expression, astigmatism becomes large, and when it is above the upper limit of conditional expression (13), spherical aberration becomes large. Therefore, it is preferably within the range that satisfies the conditional expression.

[0173] The feature of the present invention is that the power of the third lens L3 is weaker compared to the power of other lenses. However, in the present invention, by disposing a positive or negative lens with a relatively weaker power compared to other lenses in the second lens, astigmatism, spherical aberration, and distortion aberration can be effectively corrected.

[0174] 0.61 < OAL / 2 * IH < 0.65…(14)

[0175] Regarding conditional expression (14), OAL represents the overall optical length, and IH represents the image height, that is, the image circle of the optical system, showing the ratio of the overall optical length to the image circle. As in conditional expression (14), the overall optical length is 0.61 to 0.65 relative to the image circle, and it can be seen that the photographing lens of the present invention is low-profile.

[0176] In addition, regarding these conditional expressions, they are also applied after Example 2.

[0177] In addition, aspherical surfaces are used in the first lens L1 to the fourth lens L4 in each embodiment, and the aberration is corrected well by the aspherical surfaces.

[0178] The aberration diagrams, MTF, and distortion grids related to the above-mentioned Example 1 are as Figures 2A - Figure 2C shown, but as is clear from each figure, the performance is good.

[0179] [Example 2]

[0180] f = 1.9 mm, FNo. = 2.2, HFOV = 47.6°

[0181] The data of Example 2 are shown in Table 5.

[0182]

Table 5

[0183]

[0184] The data of the aspherical surfaces are as follows.

[0185]

Table 6

[0186] 4 5 6 Conic constant (k) 2.7303.E-01 2.3560.E-01 3.3491.E-01 Fourth - order coefficient 3.6626.E+00 4.2445.E+00 2.9858.E+00 Sixth - order coefficient 3.3584.E+01 -3.6097.E+01 -1.5923.E+01 Eighth - order coefficient -7.6194.E-02 -3.8037.E-01 -1.8926.E-01 Tenth - order coefficient -8.5516.E-01 -3.4145.E-01 -5.7587.E-02 Twelfth - order coefficient 6.2490.E+00 -9.5257.E-02 3.0427.E-03 Fourteenth - order coefficient -3.6196.E+01 -3.9432.E-01 5.8520.E-02 Sixteenth - order coefficient 9.5356.E+01 -9.4997.E-01 9.1192.E-02

[0187] 7 8 9 10 Conic constant (k) -2.0400.E-01 -1.5500.E+00 1.0741.E+00 2.2679.E+00 Fourth - order coefficient -4.9019.E+00 -6.4517.E-01 9.3104.E-01 4.4094.E-01 Sixth - order coefficient 1.7468.E+01 -2.6747.E+00 -1.3158.E+01 -3.4682.E+00 Eighth - order coefficient 1.4618.E-02 -1.9941.E-01 -1.8959.E-01 -2.1483.E-01 Tenth - order coefficient 1.8305.E-02 -8.0169.E-03 -1.4712.E-01 1.1021.E-01 Twelfth - order coefficient 5.3331.E-02 2.0093.E-03 2.1302.E-01 -2.9536.E-02 Fourteenth - order coefficient 2.2166.E-02 2.3129.E-03 -8.4586.E-02 -2.1950.E-04 Sixteenth - order coefficient -4.9838.E-03 1.6939.E-02 7.2494.E-03 1.4610.E-03

[0188] The parameter values of each condition are as follows.

[0189]

Table 7

[0190] Item Value f 1.94 Fno 2.20 OAL 2.80 IH 2.24 EfD1 0.88 Half FOV 47.56 EP 0.00 EXP -1.89 f12 3.48 f3 -16.55 f4 1.29 f5 -1.49 N1 1.5168 N2 1.5200 N3 1.6422 N4 1.5365 N5 1.6422

[0191]

Table 8

[0192] Conditional expression Value Lower limit Upper limit (1) f / f12 0.557 0.5 0.65 (2) |f5 / f12| 0.428 0.3 0.5 (3) N1 < N5 Refer to Table 7 (4) N1 1.517 1.49 1.55 (5) N5 1.642 1.63 1.67 (6) f / OAL 0.693 0.6 0.7 (7) OAL / EfD1 3.177 2.1 3.3 (8) EXP / IH -0.846 -0.98 -0.7 (9) |f12 / f3| 0.210 0.01 0.3 (10) f4 / f12 0.371 0.3 0.4 (11) |f4 / f5| 0.867 0.75 0.95 (12) |f5 / f3| 0.090 0.01 0.15 (13) |f4 / f3| 0.078 0.01 0.17 (14) OAL / 2*IH 0.626 0.61 0.65

[0193] These aberration diagrams, MTF, and distortion grids are as Figures 4A - Figure 4C shown, but as is clear from each figure, the performance is good.

[0194] [Example 3]

[0195] f = 1.9 mm, FNo. = 2.0, HFOV = 48.8°

[0196] The data of Example 3 are shown in Table 9.

[0197]

Table 9

[0198]

[0199] The data of the aspherical surface is as follows.

[0200]

Table 10

[0201] 4 5 6 Conic constant (k) 2.6871.E-01 2.3540.E-01 3.3150.E-01 Fourth - order coefficient 3.7214.E+00 4.2481.E+00 3.0166.E+00 Sixth - order coefficient 3.3734.E+01 -2.0205.E+01 -1.3644.E+01 Eighth - order coefficient -7.5123.E-02 -4.0362.E-01 -1.9160.E-01 Tenth - order coefficient -8.4795.E-01 -3.7506.E-01 -6.0507.E-02 Twelfth - order coefficient 6.2205.E+00 -1.2353.E-01 -1.2593.E-03 Fourteenth - order coefficient -3.6072.E+01 -5.0674.E-01 6.0581.E-02

[0202] 7 8 9 10 Conic constant (k) -1.9950.E-01 -1.6088.E+00 1.4164.E+00 2.6096.E+00 Fourth - order coefficient -5.0124.E+00 -6.2160.E-01 7.0602.E-01 3.8321.E-01 Sixth - order coefficient 1.8460.E+01 -2.7311.E+00 -6.9231.E+00 -2.9447.E+00 Eighth - order coefficient 2.6311.E-02 -2.0821.E-01 -1.6323.E-01 -2.2903.E-01 Tenth - order coefficient 1.7170.E-02 -9.7499.E-03 -1.8407.E-01 1.0882.E-01 Twelfth - order coefficient 4.7743.E-02 -4.6504.E-03 2.2166.E-01 -2.4578.E-02 Fourteenth - order coefficient 1.3144.E-02 -3.0042.E-03 -8.2083.E-02 -1.4902.E-03

[0203] The values of the parameters for each condition are as follows.

[0204]

Table 11

[0205] Item Value f 1.86 Fno 2.00 OAL 2.79 IH 2.25 EfD1 0.93 Half FOV 48.80 EP 0.00 EXP -2.12 f12 3.48 f3 -16.55 f4 1.29 f5 -1.49 N1 1.4970 N2 1.5365 N3 1.6422 N4 1.5365 N5 1.6422

[0206]

Table 12

[0207] Conditional expression Value Lower limit Upper limit (1) f / f12 0.534 0.5 0.65 (2) |f5 / f12| 0.428 0.3 0.5 (3) N1 < N5 Refer to Table 11 (4) N1 1.497 1.49 1.55 (5) N5 1.642 1.63 1.67 (6) f / OAL 0.665 0.6 0.7 (7) OAL / EfD1 3.006 2.1 3.3 (8) EXP / IH -0.945 -0.98 -0.7 (9) |f12 / f3| 0.210 0.01 0.3 (10) f4 / f12 0.371 0.3 0.4 (11) |f4 / f5| 0.867 0.75 0.95 (12) |f5 / f3| 0.090 0.01 0.15 (13) |f4 / f3| 0.078 0.01 0.17 (14) OAL / 2*IH 0.621 0.61 0.65

[0208] These aberration diagrams, MTF, and distortion grids are as Figures 6A - Figure 6C shown, and as is clear from each diagram, the performance is good.

[0209] [Example 4]

[0210] f = 1.9 mm, FNo. = 2.2, HFOV = 48.8°

[0211] The data of Example 4 is shown in Table 13.

[0212]

Table 13

[0213]

[0214] The data of the aspherical surface is as follows.

[0215]

Table 14

[0216] 4 5 6 Conic constant (k) 2.6902.E-01 2.3369.E-01 3.2965.E-01 Fourth - order coefficient 3.7173.E+00 4.2791.E+00 3.0335.E+00 Sixth - order coefficient 3.4249.E+01 -2.2085.E+01 -1.5457.E+01 Eighth - order coefficient -7.7827.E-02 -4.0431.E-01 -1.9220.E-01 Tenth - order coefficient -8.4216.E-01 -3.6219.E-01 -5.9595.E-02 Twelfth - order coefficient 6.1919.E+00 -8.2832.E-02 -6.2947.E-05 Fourteenth - order coefficient -3.6202.E+01 -4.5923.E-01 6.2988.E-02

[0217] 7 8 9 10 Conic constant (k) -2.0155.E-01 -1.6180.E+00 1.3410.E+00 2.5935.E+00 Fourth - order coefficient -4.9614.E+00 -6.1805.E-01 7.4572.E-01 3.8558.E-01 Sixth - order coefficient 1.8332.E+01 -2.7178.E+00 -8.5416.E+00 -3.0906.E+00 Eighth - order coefficient 2.6852.E-02 -2.1021.E-01 -1.6881.E-01 -2.2140.E-01 Tenth - order coefficient 1.8058.E-02 -5.0681.E-03 -1.8327.E-01 1.0525.E-01 Twelfth - order coefficient 4.8703.E-02 -3.1133.E-04 2.2464.E-01 -2.4568.E-02 Fourteenth - order coefficient 1.3588.E-02 -7.4324.E-04 -8.1370.E-02 -1.1497.E-03

[0218] The values of the parameters for each condition are as follows.

[0219]

Table 15

[0220] Item Value f 1.89 Fno 2.20 OAL 2.80 IH 2.23 EfD1 0.86 Half FOV 48.80 EP 0.00 EXP -2.02 f12 3.64 f3 -17.14 f4 1.22 f5 -1.50 N1 1.4970 N2 1.5365 N3 1.6422 N4 1.5365 N5 1.6422

[0221]

Table 16

[0222] Conditional expression Value Lower limit Upper limit (1) f / f12 0.519 0.5 0.65 (2) |f5 / f12| 0.413 0.3 0.5 (3) N1 < N5 Refer to Table 15 (4) N1 1.497 1.49 1.55 (5) N5 1.642 1.63 1.67 (6) f / OAL 0.674 0.6 0.7 (7) OAL / EfD1 3.263 2.1 3.3 (8) EXP / IH -0.905 -0.98 -0.7 (9) |f12 / f3| 0.212 0.01 0.3 (10) f4 / f12 0.337 0.3 0.4 (11) |f4 / f5| 0.816 0.75 0.95 (12) |f5 / f3| 0.088 0.01 0.15 (13) |f4 / f3| 0.071 0.01 0.17 (14) OAL / 2*IH 0.628 0.61 0.65

[0223] These aberration diagrams, MTF, and distortion grids are as Figures 8A to 8C shown, and as is clear from each aberration diagram, the performance is good.

[0224] [Example 5]

[0225] f = 1.9 mm, FNo. = 2.2, HFOV = 46°. The data of Example 5 are shown in Table 17.

[0226]

Table 17

[0227]

[0228] The data of the aspherical surface are as follows.

[0229]

Table 18

[0230] 3 5 6 Y curvature 2.2746.E-01 9.8110.E-02 1.5551.E-01 Y radius of curvature 4.3964.E+00 1.0193.E+01 6.4304.E+00 Conic constant (K) 9.8439.E-01 2.5000.E+02 -1.2211.E+02 Fourth-order coefficient (A) -6.5259.E-03 -5.6508.E-01 -2.6808.E-01 Sixth-order coefficient (B) -6.3203.E-02 -4.3227.E-01 8.3381.E-02 Eighth-order coefficient (C) -1.6922.E-01 1.9047.E+00 -4.1142.E-02 Tenth-order coefficient (D) 1.1336.E+00 -5.0802.E+00 -2.5302.E-02 Twelfth-order coefficient (E) -2.9103.E+00 -6.3138.E-01 -3.9707.E-02 Fourteenth-order coefficient (F) -2.3511.E-07 -2.7879.E+00 -1.1049.E-01 Sixteenth-order coefficient (G) 0.0000.E+00 6.3249.E-01 3.2963.E-01 Eighteenth-order coefficient (H) 0.0000.E+00 1.7636.E+00 -9.2849.E-02 Twentieth-order coefficient (J) 0.0000.E+00 3.4126.E-09 -3.0534.E-02

[0231] 7 8 9 10 Y curvature -3.9037.E-01 -1.9893.E+00 1.1707.E+00 2.7617.E+00 Y radius of curvature -2.5617.E+00 -5.0268.E-01 8.5418.E-01 3.6209.E-01 Conic constant (K) 1.5382.E+00 -2.9252.E+00 -1.4622.E+01 -3.9409.E+00 Fourth-order coefficient (A) 8.2916.E-02 -2.6845.E-01 -7.0593.E-02 -1.7230.E-01 Sixth-order coefficient (B) 5.0092.E-02 7.2008.E-02 -2.5583.E-01 6.6387.E-02 Eighth-order coefficient (C) 4.6205.E-02 -5.6363.E-02 1.9732.E-01 -1.7988.E-02 Tenth-order coefficient (D) -5.2858.E-03 1.7645.E-02 -5.8547.E-02 -1.3867.E-03 Twelfth-order coefficient (E) -1.0934.E-02 6.8057.E-02 4.8405.E-03 1.4670.E-03 Fourteenth-order coefficient (F) 1.6077.E-02 8.3981.E-02 1.6442.E-03 -1.5716.E-04 Sixteenth-order coefficient (G) 3.7727.E-02 3.2242.E-02 -6.6317.E-04 6.5502.E-07 Eighteenth-order coefficient (H) -4.0005.E-02 9.5932.E-03 -3.2883.E-04 -3.1035.E-06 Twentieth-order coefficient (J) -4.3449.E-03 -5.5962.E-02 -1.2224.E-04 -1.3680.E-06

[0232] The parameter values of each condition are as follows.

[0233]

Table 19

[0234] Item Value F 1.89 Fn0 2.20 OAL 2.90 IH 2.30 EfD1 1.27 Half FOV 46.00 EP 0.34 EXP -1.75 f12 3.15 f3 -26.65 f4 1.03 f5 -1.17 N1 1.5168 N2 1.5200 N3 1.6606 N4 1.5365 N5 1.6328

[0235]

Table 20

[0236] Condition formula Value Lower limit Upper limit (1) f / f12 0.601 0.5 0.65 (2) |f5 / f12| 0.371 0.3 0.5 (3) N1 < N5 Refer to Table 19 (4) N1 1.517 1.49 1.55 (5) N5 1.633 1.63 1.67 (6) f / OAL 0.652 0.6 0.7 (7) OAL / EfD1 2.282 2.1 3.3 (8) EXP / IH -0.758 -0.98 -0.7 (9) |f12 / f3| 0.118 0.01 0.3 (10) f4 / f12 0.328 0.3 0.4 (11) |f4 / f5| 0.883 0.75 0.95 (12) |f5 / f3| 0.044 0.01 0.15 (13) |f4 / f3| 0.039 0.01 0.17 (14) OAL / 2*IH 0.629 0.61 0.65

[0237] These aberration diagrams, MTF, and distortion grids are as Figures 10A to 10C shown. However, as is clear from each aberration diagram, the performance is good.

[0238] [Example 6]

[0239] f = 1.9 mm, FNo. = 2.2, HFOV = 47.0°

[0240] The data of Example 6 are shown in Table 21.

[0241]

Table 21

[0242]

[0243] The data of the aspherical surface are as follows.

[0244]

Table 22

[0245] 3 5 6 Y curvature 2.2237.E-01 9.8440.E-02 1.4152.E-01 Y radius of curvature 4.4970.E+00 1.0159.E+01 7.0659.E+00 Conic constant (K) -1.7628.E+00 2.4099.E+02 -1.5715.E+01 Fourth-order coefficient (A) -6.7625.E-03 -4.9905.E-01 -2.5080.E-01 Sixth-order coefficient (B) -3.0361.E-02 -4.2216.E-01 9.4525.E-02 Eighth-order coefficient (C) -1.8998.E-01 1.8858.E+00 -3.7321.E-02 Tenth-order coefficient (D) 1.2600.E+00 -4.9185.E+00 -2.8906.E-02 Twelfth-order coefficient (E) -2.9103.E+00 -6.5935.E-01 -3.3951.E-02 Fourteenth-order coefficient (F) -1.6030.E-07 -2.7717.E+00 -1.1037.E-01 Sixteenth-order coefficient (G) 0.0000.E+00 6.7250.E-01 3.2285.E-01 Eighteenth-order coefficient (H) 0.0000.E+00 1.7636.E+00 -9.6987.E-02 Twentieth-order coefficient (J) 0.0000.E+00 6.6794.E-09 -1.3292.E-01

[0246] 7 8 9 10 Y curvature -4.1175.E-01 -2.0019.E+00 1.1567.E+00 2.7612.E+00 Y radius of curvature -2.4287.E+00 -4.9953.E-01 8.6450.E-01 3.6217.E-01 Conic constant (K) 1.3990.E+00 -2.8897.E+00 -1.7251.E+01 -4.1391.E+00 Fourth-order coefficient (A) 8.3037.E-02 -2.6230.E-01 -3.4487.E-02 -1.4720.E-01 Sixth-order coefficient (B) 5.2923.E-02 7.5889.E-02 -2.3828.E-01 6.2584.E-02 Eighth-order coefficient (C) 5.2138.E-02 -5.4993.E-02 1.9733.E-01 -1.8011.E-02 Tenth-order coefficient (D) 2.6243.E-03 1.7440.E-02 -6.0759.E-02 -1.2210.E-03 Twelfth-order coefficient (E) -7.4103.E-03 6.9182.E-02 4.1180.E-03 1.4841.E-03 Fourteenth-order coefficient (F) 2.0016.E-02 8.3889.E-02 1.9052.E-03 -1.5893.E-04 Sixteenth-order coefficient (G) 3.9930.E-02 3.2317.E-02 -2.5126.E-04 2.7122.E-06 Eighteenth-order coefficient (H) -4.4989.E-02 9.6623.E-03 -6.0250.E-05 -1.0295.E-06 Twentieth-order coefficient (J) -2.2279.E-02 -5.5928.E-02 9.8511.E-06 -2.4536.E-07

[0247] The parameter values of each condition are as follows.

[0248]

Table 23

[0249] Item Value F 1.89 Fno 2.20 OAL 2.90 IH 2.30 EfD1 1.27 Half FOV 47.00 EP 0.34 EXP -1.73 f12 3.17 f3 -35.66 f4 1.03 f5 -1.15 N1 1.4875 N2 1.5200 N3 1.6606 N4 1.5365 N5 1.6328

[0250]

Table 24

[0251] Condition formula Value Lower limit Upper limit (1) f / f12 0.595 0.5 0.65 (2) |f5 / f12| 0.364 0.3 0.5 (3) N1 < N5 Refer to Table 23 (4) N1 1.487 1.49 1.55 (5) N5 1.633 1.63 1.67 (6) f / OAL 0.651 0.6 0.7 (7) OAL / EfD1 2.291 2.1 3.3 (8) EXP / IH -0.751 -0.98 -0.7 (9) |f12 / f3| 0.089 0.01 0.3 (10) f4 / f12 0.324 0.3 0.4 (11) |f4 / f5| 0.891 0.75 0.95 (12) |f5 / f3| 0.032 0.01 0.15 (13) |f4 / f3| 0.029 0.01 0.17 (14) OAL / 2*IH 0.629 0.61 0.65

[0252] These aberration diagrams, MTF, and distortion grids are as Figures 12A to 12C shown, but as is clear from each aberration diagram, the performance is good.

[0253] [Example 7]

[0254] f = 1.9 mm, FNo. = 2.2, HFOV = 47.0°

[0255] The data of Example 7 are shown in Table 25.

[0256]

Table 25

[0257]

[0258] Non

[0259] The data of the aspherical surface are as follows.

[0260]

Table 26

[0261] 3 5 6 Y curvature 2.2115.E-01 9.8996.E-02 1.4956.E-01 Y radius of curvature 4.5218.E+00 1.0101.E+01 6.6864.E+00 Conic constant (K) -1.5566.E+00 2.4484.E+02 -6.3180.E+00 Fourth-order coefficient (A) -7.1766.E-03 -5.0766.E-01 -2.4585.E-01 Sixth-order coefficient (B) -3.6672.E-02 -4.1737.E-01 9.7972.E-02 Eighth-order coefficient (C) -1.9691.E-01 1.8788.E+00 -3.2304.E-02 Tenth-order coefficient (D) 1.4649.E+00 -5.0485.E+00 -2.1512.E-02 Twelfth-order coefficient (E) -2.9103.E+00 -6.5935.E-01 -2.3908.E-02 Fourteenth-order coefficient (F) -1.6050.E-07 -2.7717.E+00 -9.8235.E-02 Sixteenth-order coefficient (G) 0.0000.E+00 6.7250.E-01 3.3709.E-01 Eighteenth-order coefficient (H) 0.0000.E+00 1.7636.E+00 -8.2412.E-02 Twentieth-order coefficient (J) 0.0000.E+00 6.6769.E-09 -1.3296.E-01

[0262] 7 8 9 10 Y curvature -4.0523.E-01 -2.0069.E+00 1.1076.E+00 2.7148.E+00 Y radius of curvature -2.4678.E+00 -4.9829.E-01 9.0287.E-01 3.6835.E-01 Conic constant (K) 1.4259.E+00 -2.8772.E+00 -1.9284.E+01 -4.2204.E+00 Fourth-order coefficient (A) 8.2757.E-02 -2.6301.E-01 -2.0721.E-02 -1.4151.E-01 Sixth-order coefficient (B) 5.2492.E-02 7.5089.E-02 -2.3800.E-01 6.3113.E-02 Eighth-order coefficient (C) 5.1341.E-02 -5.5741.E-02 1.9728.E-01 -1.8213.E-02 Tenth-order coefficient (D) 1.6025.E-03 1.6435.E-02 -6.0792.E-02 -1.2809.E-03 Twelfth-order coefficient (E) -8.4636.E-03 6.8422.E-02 4.0999.E-03 1.4914.E-03 Fourteenth-order coefficient (F) 1.9262.E-02 8.3251.E-02 1.8976.E-03 -1.5442.E-04 Sixteenth-order coefficient (G) 3.6098.E-02 3.1822.E-02 -2.5313.E-04 3.6031.E-06 Eighteenth-order coefficient (H) -4.4625.E-02 9.2494.E-03 -6.0616.E-05 -1.0264.E-06 Twentieth-order coefficient (J) -1.4629.E-02 -5.6094.E-02 9.8084.E-06 -2.9376.E-07

[0263] The parameter values for each condition are as follows.

[0264]

Table 27

[0265] Item Value F 1.89 Fno 2.20 OAL 2.90 IH 2.30 EfD1 1.27 Half FOV 47.00 EP 0.35 EXP -1.72 f12 3.17 f3 -31.67 f4 1.02 f5 -1.14 N1 1.4970 N2 1.5200 N3 1.6606 N4 1.5365 N5 1.6328

[0266]

Table 28

[0267] Condition formula Value Lower limit Upper limit (1) f / f12 0.595 0.5 0.65 (2) |f5 / f12| 0.360 0.3 0.5 (3) N1 < N5 Refer to Table 27 (4) N1 1497 1.49 1.55 (5) N5 1.633 1.63 1.67 (6) f / OAL 0.651 0.6 0.7 (7) OAL / EfD1 2.276 2.1 3.3 (8) EXP / IH -0.745 -0.98 -0.7 (9) |f12 / f3| 0.100 0.01 0.3 (10) f4 / f12 0.323 0.3 0.4 (11) |f4 / f5| 0.899 0.75 0.95 (12) |f5 / f3| 0.036 0.01 0.15 (13) |f4 / f3| 0.032 0.01 0.17 (14) OAL / 2*IH 0.629 0.61 0.65

[0268] These aberration diagrams, MTF, and distortion grids are as Figures 14A to 14C shown, but as is clear from each aberration diagram, the performance is good.

[0269] [Example 8]

[0270] f = 1.9 mm, FNo. = 2.2, HFOV = 47°

[0271] The data of Example 8 are shown in Table 29.

[0272]

Table 29

[0273]

[0274] The data of the aspherical surface is as follows.

[0275]

Table 30

[0276] 1 2 3 5 Y curvature 8.3372.E-01 1.4500.E-01 1.6820.E-01 1.6739.E-01 Y radius of curvature 1.1994.E+00 6.8963.E+00 5.9454.E+00 5.9740.E+00 Conic constant (K) -2.5321.E-01 2.4425.E+02 -9.1322.E+01 -4.6457.E+01 Fourth-order coefficient (A) -2.1667.E-02 8.6918.E-01 -8.1625.E-02 -6.5023.E-01 Sixth-order coefficient (B) -5.2256.E-02 -6.0550.E+00 -3.0061.E-01 -7.9873.E-01 Eighth-order coefficient (C) -5.1470.E-01 6.6747.E+01 -7.5062.E-01 2.2390.E+00 Tenth-order coefficient (D) 3.9600.E-02 -2.8715.E+02 -3.0144.E+00 -8.2852.E+00 Twelfth-order coefficient (E) 1.5152.E+00 -3.6616.E-08 --2.9103.E+00 -6.6137.E-01 Fourteenth-order coefficient (F) -4.7198.E+00 -5.2767.E-09 -1.7287.E-07 -2.7717.E+00 Sixteenth-order coefficient (G) -4.4631.E-03 -8.1098.E-10 0.0000.E+00 6.7250.E-01 Eighteenth-order coefficient (H) 0.0000.E+00 0.0000.E+00 0.0000.E+00 1.7636E+00 Twentieth-order coefficient (J) 0.0000.E+00 0.0000.E+00 0.0000.E+00 8.6678.E-09

[0277] 6 7 8 9 10 Y curvature 3.0905.E-01 -4.0340.E-01 -1.8507.E+00 1.1080.E+00 2.4731.E+00 Y radius of curvature 3.2357.E+00 -2.4789.E+00 -5.4034.E-01 9.0256.E-01 4.0435.E-01 Conic constant (K) -1.3693.E+01 6.2617.E-01 --2.6935.E+00 -1.2357.E+01 --3.8268.E+00 Fourth-order coefficient (A) -2.8923.E-01 9.0137.E-02 -2.5811.E-01 5.5582.E-03 -1.1972.E-01 Sixth-order coefficient (B) 2.2729.E-02 8.4583.E-02 5.0768.E-02 -2.2080.E-01 5.0895.E-02 Eighth-order coefficient (C) 2.7664.E-02 6.0088.E-02 -7.2894.E-02 1.9225.E-01 -1.3582.E-02 Tenth-order coefficient (D) 1.3377.E-01 -2.2425.E-02 1.8781.E-02 -6.2381.E-02 -9.0156.E-04 Twelfth-order coefficient (E) 1.4380.E-01 -5.7980.E-02 8.0179.E-02 3.9939.E-03 1.3159.E-03 Fourteenth-order coefficient (F) 6.2794.E-03 -3.9352.E-02 9.2692.E-02 1.9728.E-03 -1.9675.E-04 Sixteenth-order coefficient (G) 2.8566.E-01 -4.7426.E-03 3.2065.E-02 -2.1772.E-04 1.4082.E-06 Eighteenth-order coefficient (H) -2.4062.E-01 -6.7673.E-02 -6.0965.E-03 -5.5243.E-05 -4.6432.E-07 Twentieth-order coefficient (J) -1.8011.E-01 3.3439.E-02 -9.0335.E-02 7.4195.E-06 1.0474.E-07

[0278] The values of the parameters for each condition are as follows.

[0279]

Table 31

[0280] Item Value F 1.85 Fno 2.20 OAL 2.90 IH 2.09 EfD1 1.19 Half FOV 47.00 EP 0.30 EXP -1.81 f12 2.94 f3 -11.37 f4 1.12 f5 -1.40 N1 14970 N2 1.5200 N3 1.6606 N4 1.5365 N5 1.6328

[0281]

Table 32

[0282] Conditional expression Value Lower limit Upper limit (1) f / f12 0.632 0.5 0.65 (2) |f5 / f12| 0.477 0.3 0.5 (3) N1 < N5 Refer to Table 31 (4) N1 1.497 1.49 1.55 (5) N5 1.633 1.63 1.67 (6) f / OAL 0.639 0.6 0.7 (7) OAL / EfD1 2.434 2.1 3.3 (8) EXP / IH -0.868 -0.98 -0.7 (9) |f12 / f3| 0.258 0.01 0.3 (10) f4 / f12 0.382 0.3 0.4 (11) |f4 / f5| 0.801 0.75 0.95 (12) |f5 / f3| 0.123 0.01 0.15 (13) |f4 / f3| 0.099 0.01 0.17 (14) OAL / 2 * IH 0.694 0.61 0.65

[0283] These aberration diagrams, MTF, and distortion grids are as Figures 16A to 16C shown, and as is clear from each aberration diagram, the performance is good.

[0284] As described above, as in Examples 1 to 8, Figures 2A to 2C , Figures 4A to 4C , Figures 6A to 6C , Figures 8A to 8C , Figures 10A to 10C , Figures 12A to 12C , Figures 14A to 14C and Figures 16A to 16C shown, the imaging lens 100 of the present disclosure is bright, has high performance, and is miniaturized (shortened in the optical axis direction), and the semi-field angle is approximately 50° achieved by five lenses. In addition, it is clearly suitable as an imaging device, especially for an imaging device for a laptop PC.

[0285] As described above, several embodiments of the present application have been described in detail with reference to the drawings. However, these embodiments are illustrative, and the present invention can be implemented in other ways with various modifications and improvements based on the knowledge of those skilled in the art, starting from the manner described in the disclosure column of the present invention.

Claims

1. A photographing lens, wherein: The first to fifth lenses are provided, and the first to fifth lenses are arranged in order from the object side. The first lens is a positive lens with its convex surface facing the object side. The second lens is a lens with a concave surface facing the image plane side. The third lens is a positive lens or a negative lens having an inflection point on at least one surface and a small deviation ratio. The fourth lens is a positive lens having a convex surface facing the image plane and a surface on the object side having an inflection point at the periphery of the lens. The fifth lens is a negative lens having a concave surface on the image side and an inflection point at the periphery. The first lens is bonded to the second lens. When the combined focal length of the first lens and the second lens is set to f12, the focal length of the fifth lens is set to f5, and the focal length of the entire optical system is set to f, conditions (1) and (2) are satisfied, that is: 0.50<|f / f12|<0.65···(1) 0.30<|f5 / f12|<0.50···(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 set to N1, and the refractive index of the material of the fifth lens with respect to the d-line is set to N5, condition (3) is satisfied, that is: N1<N5···(3).

3. The imaging lens according to claim 1, wherein: When the refractive index of the material of the first lens for the d-line is set to N1, condition (4) is satisfied, that is: 1.49＜N1＜1.55···(4)。 4. The imaging lens according to claim 1, wherein: When the refractive index of the material of the fifth lens for the d-line is set to N5, condition (5) is satisfied, that is: 1.63＜N5＜1.67···(5)。 5. The photographing lens according to claim 1, wherein: When the focal length of the entire optical system is set to f and the total length of the optical system is set to OAL, condition (6) is satisfied, that is: 0.60<f / OAL<0.70···(6).

6. The photographing lens according to claim 1, wherein: When the total optical length is set to OAL and the optical effective diameter of the lens closest to the object is set to EfD1, condition (7A) is satisfied, that is: 2.1<OAL / EfD1<3.3···(7).

7. The photographing lens according to claim 1, wherein: When the exit pupil position is set to EXP and the image height is set to IH, condition (8) is satisfied, that is: -0.98<EXP / IH<-0.70···(8).

8. The photographing lens according to claim 1, wherein: When the combined focal length of the first lens and the second lens is set to f12, and the focal length of the third lens is set to f3, condition (9) is satisfied, that is: 0.01<|f12 / f3|<0.30···(9).

9. The photographing lens according to claim 1, wherein: When the combined focal length of the first lens and the second lens is set to f12, and the focal length of the fourth lens is set to f4, condition (10) is satisfied, that is: 0.30<f4 / f12<0.40···(10).

10. The photographing 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 (11) is satisfied, that is: 0.75<|f4 / f5|<0.95···(11).

11. A photographing device, wherein: have: The imaging lens according to claim 1; and The single-body imaging element receives the image formed by the imaging lens and generates an imaging signal.

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

Images