Shooting optical lens

Abstract

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which comprises a first lens with positive refraction power, a second lens with negative refraction power, a third lens with negative refraction power and a triangular prism with negative refraction power which are sequentially arranged from the object side to the image side. Wherein the axial distance from the object side surface of the first lens to the image side surface of the third lens is D, the optical total length of the camera shooting optical lens is TTL, the Abbe number of a glass lens of the camera shooting optical lens is vdi, the focal length of the camera shooting optical lens is f, the focal length of the first lens is f1, the axial thickness of the second lens is d3, and the axial thickness of the third lens is d5; the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, and the following relational expression is satisfied: 0.14 < = D / TTL < = 0.46; 40.00 < = vdi < = 82.00; 0.30 < = f1 / f < = 0.70; -32.08 < = f23 / (D3 + D4 + D5) < =-3.00; 1.40 < = (R5 + R6) / (R5-R6) < = 20.00.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for portable terminal devices such as smart phones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Art

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized camera optical lenses has been increasing. Due to the reduction in the pixel size of photosensitive devices and the trend of today's electronic products to have good functions and a thin and portable appearance, miniaturized camera optical lenses with good imaging quality have become the mainstream in the current market. Telephoto camera lenses can meet the needs of consumers to shoot specific targets. The total optical length of traditional telephoto camera lenses is too large and does not meet the design requirements of smartphones for thinness. The periscope telephoto camera lens design can significantly shorten the total optical length of the camera optical lens while meeting the telephoto design. However, the optical performance of existing periscope telephoto camera optical lenses still cannot meet the demand. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a camera optical lens that can achieve high imaging performance while satisfying a large aperture periscope design.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a camera optical lens, which comprises, from the object side to the image side, in order: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a prism with negative refractive power; at least one of the first lens, the second lens and the third lens is a glass lens; the prism is made of plastic; wherein the total length of the lens group of the camera optical lens on the axis from the object side of the first lens to the image side of the third lens is D, the total optical length of the camera optical lens is TTL, the Abbe number of the glass lens of the camera optical lens is vdi, and the focal length of the camera optical lens is is f, the focal length of the first lens is f1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the radius of curvature of the object side surface of the third lens is R5, and the radius of curvature of the image side surface of the third lens is R6, satisfying the following relationships: 0.14≤D / TTL≤0.46; 40.00≤vdi≤82.00; 0.30≤f1 / f≤0.70; -32.08≤f23 / (d3+d4+d5)≤-3.00; 1.40≤(R5+R6) / (R5-R6)≤20.00.

[0005] Preferably, the image height of the camera optical lens 1.0 field of view is IH, the field angle of the camera optical lens 1.0 field of view is FOV, and the following relationship is satisfied: 2.10≤IH*f / FOV≤6.10.

[0006] Preferably, the axial thickness of the first lens is d1, and satisfies the following relationship: 3.10≤f1 / d1≤5.60.

[0007] Preferably, the object side surface of the first lens is convex at the paraxial position; the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the axial thickness of the first lens is d1, and the following relationship is satisfied: -3.03≤(R1+R2) / (R1-R2)≤-0.16; 0.065≤d1 / TTL≤0.132.

[0008] Preferably, the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, and the following relationships are satisfied: -13.36≤f2 / f≤-0.55; -21.64≤(R3+R4) / (R3-R4)≤5.92; 0.018≤d3 / TTL≤0.066.

[0009] Preferably, the object side surface of the third lens is convex at the paraxial position, and the image side surface thereof is concave at the paraxial position; the focal length of the third lens is f3, and satisfies the following relationship: -4.76≤f3 / f≤-0.33; 0.013≤d5 / TTL≤0.082.

[0010] Preferably, the aperture F number of the camera optical lens is Fno, and satisfies the following relationship: Fno≤3.09.

[0011] Preferably, the total optical length of the camera optical lens is TTL, the image height of 1.0 field of view of the camera optical lens is IH, and the following relationship is satisfied: TTL / IH≤7.22.

[0012] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical properties, meets the design requirements of large aperture, periscope telephoto and miniaturization, and is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0014] Figure 1 is a schematic structural diagram of an imaging optical lens according to a first embodiment of the present invention;

[0015] Figure 2 yes Figure 1 Schematic diagram of axial aberration of the camera optical lens shown;

[0016] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0017] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0018] Figure 5 is a schematic structural diagram of an imaging optical lens according to a second embodiment of the present invention;

[0019] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0020] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0021] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0022] Fig. 9 is a schematic structural diagram of a camera optical lens according to a third embodiment of the present invention;

[0023] Fig.10 yes Fig. 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0024] Fig.11 yes Fig. 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0025] Fig.12 yes Fig. 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0026] Fig.13is a schematic structural diagram of a camera optical lens according to a fourth embodiment of the present invention;

[0027] Fig.14 yes Fig.13 Schematic diagram of axial aberration of the camera optical lens shown;

[0028] Fig.15 yes Fig.13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0029] Fig.16 yes Fig.13 Schematic diagram of field curvature and distortion of the camera optical lens shown. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0031] With reference to the accompanying drawings, the technical solution of the present invention provides an imaging optical lens 10 , 20 , 30 , 40 . Figure 1 , 5 , 9, and 13 show the imaging optical lenses 10, 20, 30, and 40 of the present invention, which are composed of a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a prism TP, which are arranged in sequence from the object side to the image side.

[0032] The prism TP is made of plastic, which helps to reduce costs.

[0033] The axial distance from the object side of the first lens of the camera optical lens 10, 20, 30, 40 to the image side of the third lens is defined as D, and the total optical length of the camera optical lens 10, 20, 30, 40 is defined as TTL, which satisfies the following relationship: 0.14≤D / TTL≤0.46, which stipulates the ratio of the total length of the lens group to the total optical length of the system. Within the range of the conditional expression, it helps to control the front end length of the periscope lens.

[0034] At least one of the first lens L1, the second lens L2 and the third lens L3 is a glass lens.

[0035] The Abbe number of the glass lens of the camera optical lenses 10, 20, 30, and 40 is defined as vdi, which satisfies the following relationship: 40.00≤vdi≤82.00. At least one glass lens is used for the first three lenses, and the Abbe number of the glass lens used is specified. Within this range, the material properties can be effectively allocated and the chromatic aberration can be effectively corrected to make the chromatic aberration |LC|≤2.0μm.

[0036] The focal lengths of the camera optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the first lens is defined as f1, which satisfies the following relationship: 0.30≤f1 / f≤0.70, which specifies the ratio of the first lens to the total focal length of the system. By reasonably allocating the optical focal length of the system, the system has better imaging quality and lower sensitivity.

[0037] The on-axis thickness of the second lens is defined as d3, the on-axis thickness of the third lens is defined as d5, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is defined as d4, and the combined focal length of the second lens and the third lens is defined as f23, which satisfies the following relationship: -32.08≤f23 / (d3+d4+d5)≤-3.00. When the conditional expression satisfies the above conditions, it helps the rear end lens to maintain a negative refractive power of sufficient strength to correct the off-axis aberration of the image side end, and at the same time can effectively shorten the total optical length to achieve the purpose of miniaturization, thereby expanding the application range of the product.

[0038] The radius of curvature of the object side of the third lens is defined as R5, and the radius of curvature of the image side of the third lens is defined as R6, which satisfies the following relationship: 1.40≤(R5+R6) / (R5-R6)≤20.00. The shape of the third lens is specified. Within the range of the conditional expression, it is beneficial to alleviate the degree of deflection of light passing through the lens and can effectively reduce aberrations.

[0039] When the above conditions are met, the camera optical lenses 10, 20, 30, 40 have good optical performance and can meet the design requirements of large aperture, telephoto and miniaturization. According to the characteristics of the camera optical lenses 10, 20, 30, 40, the camera optical lenses 10, 20, 30, 40 are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0040] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0041] The image height of the camera optical lens 1.0 field of view is defined as IH, and the field of view angle of the camera optical lens 1.0 field of view is defined as FOV, which satisfies the following relationship: 2.10≤IH*f / FOV≤6.10, which is conducive to miniaturization and wide angle while ensuring imaging quality.

[0042] The axial thickness of the first lens L1 is defined as d1, which satisfies the following relationship: 3.10≤f1 / d1≤5.60. When f1 / d1 satisfies the above relationship, it helps to buffer the change of the incident angle of light, so that it can propagate smoothly in the camera optical lenses 10, 20, 30, 40, while maintaining the refractive power strength of the first lens L1 to improve chromatic aberration and enhance imaging quality.

[0043] The object-side surface of the first lens L1 is convex at the paraxial position, and the image-side surface is convex or concave at the paraxial position. The object-side surface of the first lens L1 may also be concave.

[0044] The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relationship: -3.03≤(R1+R2) / (R1-R2)≤-0.16. The shape of the first lens is reasonably controlled so that the first lens can effectively correct the system spherical aberration.

[0045] The axial thickness of the first lens L1 is d1, and the total optical length of the entire camera optical lens 10, 20, 30, 40 is TTL, which satisfies the following relationship: 0.065≤d1 / TTL≤0.132, which is conducive to achieving ultra-thinness.

[0046] The object-side surface of the second lens L2 is convex or concave at the paraxial position, and the image-side surface is convex or concave at the paraxial position.

[0047] The focal length of the second lens L2 is f2, and the focal length of the overall camera optical lenses 10, 20, 30, and 40 is f, which satisfies the following relationship: -13.36≤f2 / f≤-0.55. By controlling the negative focal length of the second lens L2 within a reasonable range, it is beneficial to correct the aberration of the optical system.

[0048] The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relationship: -21.64≤(R3+R4) / (R3-R4)≤5.92, which specifies the shape of the second lens L2. When within the range, as the lens develops towards ultra-thin and wide-angle, it is beneficial to correct the axial chromatic aberration problem.

[0049] The total optical length of the overall camera optical lenses 10, 20, 30, 40 is TTL, which satisfies the following relationship: 0.018≤d3 / TTL≤0.066, which is conducive to achieving ultra-thinness.

[0050] The object side surface of the third lens L3 is convex at the near axis, and the image side surface is concave at the near axis. The object side surface and the image side surface of the third lens L3 can also be set to other concave and convex distributions.

[0051] The focal length of the third lens L3 is f3, and the focal length of the overall camera optical lenses 10, 20, 30, and 40 is f, which satisfies the following relationship: -4.76≤f3 / f≤-0.33. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0052] The total optical length of the overall camera optical lenses 10, 20, 30, 40 is TTL, which satisfies the following relationship: 0.013≤d5 / TTL≤0.082, which is conducive to achieving ultra-thinness.

[0053] By adding the prism TP, the turning of the optical path can be achieved, thereby reducing the length of the entire optical system to adapt to the development trend of miniaturization and micro-miniaturization of electronic devices.

[0054] The image height of 1.0 field of view of the camera optical lenses 10, 20, 30, 40 is IH, and the total optical length of the camera optical lenses 10, 20, 30, 40 is TTL, which satisfies the following relationship: TTL / IH≤7.22, which is conducive to miniaturization.

[0055] The aperture F number of the camera optical lenses 10, 20, 30, and 40 is less than or equal to 3.09, with a large aperture and good imaging performance.

[0056] In the present invention, an aperture S1 is disposed on the object side and before the first lens L1 , and the aperture S1 may also be disposed at other positions.

[0057] In the present invention, an optical element such as an optical filter GF is disposed between the prism TP and the imaging surface Si, wherein the optical filter GF can be a glass cover plate or an optical filter. The optical filter GF can also be disposed at other positions.

[0058] The imaging optical lens 10 of the present invention will be described below using examples. The symbols described in each example are as follows: The focal length, axial distance, radius of curvature, and axial thickness are in units of mm.

[0059] TTL: optical length (the axial distance from the object side of the first lens L1 to the imaging surface Si), in mm.

[0060] Aperture value FNO: refers to the ratio of the effective focal length of the camera optical lens to the entrance pupil diameter.

[0061] 1.0 Image height IH of the field of view: the height of the field of view corresponding to the effective pixel of the sensor (that is, half of the diagonal length of the effective pixel area of ​​the sensor);

[0062] 1.0 Field of view FOV: the field of view angle corresponding to the effective pixels of the sensor;

[0063] Image height IHm of MIC field of view: the field of view height expanded beyond 1.0 to prevent assembly deviation;

[0064] Field of view angle FOVm of MIC field of view: the field of view angle corresponding to the image height of MIC field of view.

[0065] Next, the technical solution of the present invention is specifically described with four implementation modes.

[0066] (First Embodiment)

[0067] The first lens L1 has positive refractive power and is made of glass, and its object side surface is convex at the paraxial position, and its image side surface is convex at the paraxial position;

[0068] The second lens L2 has negative refractive power and is made of plastic, with its object side surface being convex at the near axis and its image side surface being concave at the near axis;

[0069] The third lens L3 has negative refractive power and is made of plastic. Its object-side surface is convex at the near-axis position, and its image-side surface is concave at the near-axis position.

[0070] Table 1, Table 2, and Table 3 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0071]

Table 1

[0072]

[0073] The meaning of each symbol is as follows.

[0074] S1: aperture;

[0075] R: The radius of curvature of the optical surface, and the central radius of curvature for lenses;

[0076] R1: the radius of curvature of the object side of the first lens L1;

[0077] R2: the radius of curvature of the image side of the first lens L1;

[0078] R3: the radius of curvature of the object side of the second lens L2;

[0079] R4: the radius of curvature of the image side of the second lens L2;

[0080] R5: the radius of curvature of the object side of the third lens L3;

[0081] R6: the radius of curvature of the image side of the third lens L3;

[0082] R7: radius of curvature of the object side of the prism TP;

[0083] R8: radius of curvature of the image side of the prism TP;

[0084] R9: radius of curvature of the object side of the optical filter GF;

[0085] R10: radius of curvature of the image side of the optical filter GF;

[0086] d: the on-axis thickness of the lens and the on-axis distance between the lenses;

[0087] d0: the axial distance from the aperture S1 to the object side of the first lens L1;

[0088] d1: axial thickness of the first lens L1;

[0089] d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

[0090] d3: axial thickness of the second lens L2;

[0091] d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

[0092] d5: axial thickness of the third lens L3;

[0093] d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the prism TP;

[0094] d7: the axial thickness of the prism TP;

[0095] d8: the axial distance from the image side of the prism TP to the object side of the optical filter GF;

[0096] d9: axial thickness of the optical filter GF;

[0097] d10: the axial distance from the image side to the image plane of the optical filter GF;

[0098] nd: refractive index of d-line;

[0099] nd1: refractive index of the first lens L1 at the d-line;

[0100] nd2: refractive index of the d-line of the second lens L2;

[0101] nd3: refractive index of the third lens L3 at the d-line;

[0102] nd4: refractive index of the d-line of the prism TP;

[0103] ndg: refractive index of the d-line of the optical filter GF;

[0104] vd: Abbe number;

[0105] vd1: Abbe number of the first lens L1;

[0106] vd2: Abbe number of the second lens L2;

[0107] vd3: Abbe number of the third lens L3;

[0108] vd4: Abbe number of prism TP;

[0109] vdg: Abbe number of the optical filter GF.

[0110] Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0111]

Table 2

[0112]

[0113]

[0114] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (1). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (1).

[0115] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16

[0116] +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0117] Wherein, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0118] Figure 2 , Figure 3 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm and 436 nm after passing through the imaging optical lens 10 of the first embodiment are shown respectively. Figure 4 FIG. 1 shows a schematic diagram of field curvature and distortion of light having a wavelength of 546 nm after passing through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0119] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 6.363 mm, the image height IH of the 1.0 field of view is 3.575 mm, the field angle FOV of the 1.0 field of view is 21.79°, the image height IHm of the MIC field of view is 3.695 mm, and the field angle FOVm of the MIC field of view is 22.48°. The camera optical lens 10 meets the design requirements of large aperture, telephoto, and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0120] (Second Embodiment)

[0121] The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0122] The difference from the first embodiment is that the image side surface of the first lens L1 is a concave surface at the paraxial position.

[0123] Figure 5 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0124] Tables 3 and 4 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0125]

Table 3

[0126]

[0127]

[0128] Table 4 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0129]

Table 4

[0130]

[0131] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (2). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (2).

[0132] z=(cr 2) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16

[0133] +A18r 18 +A20r 20 (2)

[0134] Wherein, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0135] Figure 6 , Figure 7 Schematic diagrams showing axial aberration and magnification chromatic aberration of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm and 436 nm after passing through the imaging optical lens 20 of the second embodiment are shown respectively. Figure 8 FIG. 2 shows a schematic diagram of field curvature and distortion of light having a wavelength of 546 nm after passing through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0136] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 5.815 mm, the image height IH of the 1.0 field of view is 3.575 mm, the field angle FOV of the 1.0 field of view is 23.68°, the image height IHm of the MIC field of view is 3.695 mm, and the field angle FOVm of the MIC field of view is 24.42°. The camera optical lens 20 meets the design requirements of large aperture, telephoto, and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0137] (Third Embodiment)

[0138] The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0139] The difference from the first embodiment is that the object-side surface of the second lens L2 is concave at the paraxial position, and the image-side surface is convex at the paraxial position.

[0140] Fig. 9FIG. 1 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0141] Tables 5 and 6 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0142]

Table 5

[0143]

[0144]

[0145] Table 6 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0146]

Table 6

[0147]

[0148] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (2). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (2).

[0149] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16

[0150] +A18r 18 +A20r 20 (2)

[0151] Wherein, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0152] Fig.10 , Fig.11 Schematic diagrams showing axial aberration and magnification chromatic aberration of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm and 436 nm after passing through the imaging optical lens 30 of the third embodiment are shown respectively. Fig.12FIG. 4 shows a schematic diagram of field curvature and distortion of light having a wavelength of 546 nm after passing through the camera optical lens 30 of the third embodiment. Fig.12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0153] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 8.680 mm, the image height IH of the 1.0 field of view is 3.575 mm, the field angle FOV of the 1.0 field of view is 15.49°, the image height IHm of the MIC field of view is 3.695 mm, and the field angle FOVm of the MIC field of view is 16.00°. The camera optical lens 30 meets the design requirements of large aperture, telephoto, and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0154] (Fourth Embodiment)

[0155] The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0156] The difference from the first embodiment is that the object-side surface of the second lens L2 is concave at the paraxial position, and the image-side surface is convex at the paraxial position.

[0157] Fig.13 FIG. 4 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0158] Tables 7 and 8 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0159]

Table 7

[0160]

[0161]

[0162] Table 8 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0163]

Table 8

[0164]

[0165] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (2). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (2).

[0166] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r8 +A10r 10 +A12r 12 +A14r 14 +A16r 16

[0167] +A18r 18 +A20r 20 (2)

[0168] Wherein, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0169] Fig.14 , Fig.15 Schematic diagrams showing axial aberration and magnification chromatic aberration of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm and 436 nm after passing through the imaging optical lens 40 of the fourth embodiment are shown respectively. Fig.16 FIG. 4 shows a schematic diagram of field curvature and distortion of light having a wavelength of 546 nm after passing through the camera optical lens 40 of the fourth embodiment. Fig.16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0170] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 5.425 mm, the image height IH of the 1.0 field of view is 3.575 mm, the field angle FOV of the 1.0 field of view is 25.50°, the image height IHm of the MIC field of view is 3.695 mm, and the field angle FOVm of the MIC field of view is 26.31°. The camera optical lens 40 meets the design requirements of large aperture, telephoto, and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0171] Table 9 that appears later shows the values ​​corresponding to the parameters specified in the conditional expressions and various numerical values ​​in each of the first, second, third, and fourth embodiments.

[0172]

Table 9

[0173]

[0174]

[0175] Those skilled in the art will appreciate that the above-mentioned embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that: The camera optical lens is composed of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a prism, which are arranged in sequence from the object side to the image side; at least one of the first lens, the second lens and the third lens is a glass lens; the prism is made of plastic; Wherein, the axial distance from the object side of the first lens to the image side of the third lens is D, the total optical length of the camera optical lens is TTL, the Abbe number of the glass lens of the camera optical lens is vdi, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, the axial distance from the image side of the second lens to the object side of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the radius of curvature of the object side of the third lens is R5, and the radius of curvature of the image side of the third lens is R6, satisfying the following relationship: 0.14≤D / TTL≤0.46; 40.00≤vdi≤82.00; 0.30≤f1 / f≤0.70; -32.08≤f23 / (d3+d4+d5)≤-3.00; 1.40≤(R5+R6) / (R5-R6)≤20.

00.

2. The imaging optical lens according to claim 1, characterized in that: The image height of the camera optical lens 1.0 field of view is IH, the field angle of view of the camera optical lens 1.0 field of view is FOV, and the following relationship is satisfied: 2.10≤IH*f / FOV≤6.

10.

3. The imaging optical lens according to claim 1, characterized in that: The axial thickness of the first lens is d1, and satisfies the following relationship: 3.10≤f1 / d1≤5.

60.

4. The imaging optical lens according to claim 1, wherein: The object side surface of the first lens is convex at the paraxial position; The curvature radius of the object side of the first lens is R1, the curvature radius of the image side of the first lens is R2, the axial thickness of the first lens is d1, and the following relationship is satisfied: -3.03≤(R1+R2) / (R1-R2)≤-0.16; 0.065≤d1 / TTL≤0.

132.

5. The imaging optical lens according to claim 1, wherein: The focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, and the following relationship is satisfied: -13.36≤f2 / f≤-0.55; -21.64≤(R3+R4) / (R3-R4)≤5.92; 0.018≤d3 / TTL≤0.

066.

6. The imaging optical lens according to claim 1, characterized in that: The object side surface of the third lens is convex at the paraxial position, and the image side surface thereof is concave at the paraxial position; The focal length of the third lens is f3, and satisfies the following relationship: -4.76≤f3 / f≤-0.33; 0.013≤d5 / TTL≤0.

082.

7. The imaging optical lens according to claim 1, characterized in that: The aperture F number of the camera optical lens is Fno, and satisfies the following relationship: Fno≤3.

09.

8. The imaging optical lens according to claim 1, wherein: The total optical length of the camera optical lens is TTL, and the image height of the camera optical lens 1.0 field of view is IH, and the following relationship is satisfied: TTL / IH≤7.22.

Images