WO2021189917A1 - 摄像镜头 - Google Patents

摄像镜头 Download PDF

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Publication number
WO2021189917A1
WO2021189917A1 PCT/CN2020/132267 CN2020132267W WO2021189917A1 WO 2021189917 A1 WO2021189917 A1 WO 2021189917A1 CN 2020132267 W CN2020132267 W CN 2020132267W WO 2021189917 A1 WO2021189917 A1 WO 2021189917A1
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Prior art keywords
lens
curvature
refractive power
radius
object side
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PCT/CN2020/132267
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English (en)
French (fr)
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新田耕二
寺岡弘之
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诚瑞光学(深圳)有限公司
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Publication of WO2021189917A1 publication Critical patent/WO2021189917A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to an imaging lens, and in particular to a portable module camera, WEB camera, etc., suitable for high-resolution CCD, CMOS, etc.
  • the field of view (hereinafter referred to as 2 ⁇ ) is a wide-angle of 80° or more and has good optical characteristics and is an imaging lens composed of 8 lenses.
  • imaging elements such as CCD and CMOS have become widespread. With the miniaturization and high performance of these imaging elements, an imaging lens with a low height, a wide angle, and good optical characteristics is sought.
  • Patent Document 1 proposes the following imaging lens: a first lens with positive refractive power, a second lens with positive refractive power, and a negative refractive power are arranged in order from the object side The third lens, the fourth lens with positive refractive power, the fifth lens with negative refractive power, the sixth lens with positive refractive power, the seventh lens with negative refractive power, and the eighth lens with negative refractive power.
  • the difference between the Abbe number of the first lens and the Abbe number of the second lens, the Abbe number of the second lens and the Abbe number of the third lens is not sufficient, and therefore the height reduction and wide angle are not sufficient.
  • Patent Document 1 JP 2017-116594 Publication
  • the object of the present invention is to provide an imaging lens composed of 8 lenses that has a low height, a wide angle, and good optical characteristics.
  • the imaging lens described in claim 1 is provided with a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, and
  • the fifth lens with negative refractive power, the sixth lens with positive refractive power, the seventh lens with positive or negative refractive power, and the eighth lens with negative refractive power and satisfy the following relational expressions (1) and (2):
  • v1 represents the Abbe number of the first lens
  • v2 represents the Abbe number of the second lens
  • v3 represents the Abbe number of the third lens.
  • the imaging lens described in Technical Solution 2 is based on the imaging lens described in Technical Solution 1, and satisfies the following relationship (3):
  • d1 represents the center thickness of the first lens
  • d2 represents the on-axis distance from the image side surface of the first lens to the object side surface of the second lens
  • d3 represents the center thickness of the second lens.
  • the imaging lens described in Technical Solution 3 is based on the imaging lens described in Technical Solution 1, and satisfies the following relationship (4):
  • R3 represents the radius of curvature of the object side surface of the second lens
  • R4 represents the radius of curvature of the image side surface of the second lens.
  • the imaging lens described in Technical Solution 4 is based on the imaging lens described in Technical Solution 1, and satisfies the following relationship (5):
  • R5 represents the radius of curvature of the object side surface of the third lens
  • R6 represents the radius of curvature of the image side surface of the third lens.
  • the imaging lens described in Technical Solution 5 is based on the imaging lens described in Technical Solution 1, and satisfies the following relationship (6):
  • f the overall focal length of the camera lens
  • d4 represents the on-axis distance from the image side surface of the second lens to the object side surface of the third lens.
  • an imaging lens suitable for portable module cameras, WEB cameras, etc., which use high-resolution CCD, CMOS, and other imaging elements.
  • the height is reduced to TTL (optical length)/IH (image height) ⁇ 1.35, to ensure a wide angle of 2 ⁇ >80° or more, and has good optical characteristics, it is composed of 8 lenses.
  • FIG. 1 is a diagram showing a schematic configuration of an imaging lens LA according to Example 1 of the present invention.
  • Fig. 2 is a diagram showing spherical aberration, curvature of field, and distortion of the imaging lens LA according to Example 1 of the present invention.
  • Fig. 3 is a diagram showing a schematic configuration of an imaging lens LA according to Example 2 of the present invention.
  • FIG. 4 is a diagram showing spherical aberration, curvature of field, and distortion of imaging lens LA according to Example 2 of the present invention.
  • FIG. 5 is a diagram showing a schematic configuration of an imaging lens LA according to Example 3 of the present invention.
  • FIG. 6 is a diagram showing spherical aberration, curvature of field, and distortion of imaging lens LA according to Example 3 of the present invention.
  • Fig. 7 is a diagram showing a schematic configuration of an imaging lens LA according to Example 4 of the present invention.
  • FIG. 8 is a diagram showing spherical aberration, curvature of field, and distortion of the imaging lens LA according to Example 4 of the present invention.
  • the imaging lens LA includes a lens system in which a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 are arranged from the object side to the image side.
  • a glass plate GF is arranged between the eighth lens L8 and the image surface. As this glass plate GF, cover glass, various filters, etc. are conceived. In the present invention, the glass plate GF can be arranged in different positions, and can also be omitted.
  • the first lens L1 is a lens with positive refractive power
  • the second lens L2 is a lens with positive refractive power
  • the third lens L3 is a lens with negative refractive power
  • the fourth lens L4 is a lens with positive refractive power.
  • the lens L5 is a lens with negative refractive power
  • the sixth lens L6 is a lens with positive refractive power
  • the seventh lens L7 is a lens with positive or negative refractive power
  • the eighth lens L8 is a lens with negative refractive power.
  • v3 Abbe number of the third lens.
  • the relational expression (1) specifies the difference between the Abbe number v1 of the first lens L1 and the Abbe number v2 of the second lens L2. When it is outside the range of the relational expression (1), it is not preferable to correct the on-axis and off-axis chromatic aberrations due to wide-angle and low-profile.
  • the relational expression (2) specifies the difference between the Abbe number v2 of the second lens L2 and the Abbe number v3 of the third lens L3. When it is outside the range of the relational expression (2), the correction of on-axis and off-axis chromatic aberration becomes difficult with the wide-angle and lower height, which is not preferable.
  • the camera lens LA satisfies the following relationship (3):
  • d2 the on-axis distance from the image side of the first lens to the object side of the second lens
  • d3 The center thickness of the second lens.
  • the relational expression (3) defines the relationship between the center thickness of the first lens L1, the center thickness of the second lens L2, and the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2.
  • it is easy to achieve a wide angle and a low height with good optical characteristics, and therefore it is preferable.
  • the camera lens LA satisfies the following relationship (4):
  • R3 the radius of curvature of the object side of the second lens
  • R4 The radius of curvature of the image side surface of the second lens.
  • the relational expression (4) defines the ratio of the curvature radius R3 of the object side surface of the second lens L2 to the curvature radius R4 of the image side surface of the second lens L2. When it is within the range of the relational expression (4), it is easy to achieve a wide angle and low height with good optical characteristics, and therefore it is preferable.
  • the camera lens LA satisfies the following relationship (5):
  • R5 The radius of curvature of the object side of the third lens
  • R6 The radius of curvature of the image side surface of the third lens.
  • the relational expression (5) defines the ratio of the radius of curvature R5 of the object side surface of the third lens L3 to the radius of curvature R6 of the image side surface of the third lens L3. When it is within the range of the relational expression (5), it is easy to achieve a wide angle and low height with good optical characteristics, and therefore it is preferable.
  • the camera lens LA satisfies the following relationship (6):
  • d4 the on-axis distance from the image side surface of the second lens to the object side surface of the third lens.
  • the relational expression (6) defines the ratio of the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 to the focal length f of the entire imaging lens. When it is in the range of the relational expression (6), it is easy to achieve a wide angle and a low height with good optical characteristics, so it is preferable.
  • the 8 lenses that make up the imaging lens LA satisfy the above-mentioned configuration and relational expressions, so that the height can be reduced to TTL (optical length)/IH (image height) ⁇ 1.35, 2 ⁇ > 80° or more wide angle and good optics can be obtained.
  • TTL optical length
  • IH image height
  • R The radius of curvature of the optical surface, in the case of a lens, the radius of curvature of the center
  • R1 the radius of curvature of the object side of the first lens L1
  • R2 the radius of curvature of the image side surface of the first lens L1
  • R3 the radius of curvature of the object side of the second lens L2
  • R4 the radius of curvature of the image side surface of the second lens L2
  • R5 the radius of curvature of the object side surface of the third lens L3
  • R6 the radius of curvature of the image side surface of the third lens L3
  • R7 The curvature radius of the object side of the fourth lens L4
  • R8 the radius of curvature of the image side surface of the fourth lens L4
  • R9 the radius of curvature of the object side surface of the fifth lens L5
  • R10 the radius of curvature of the image side surface of the fifth lens L5
  • R11 the radius of curvature of the object side surface of the sixth lens L6
  • R12 the radius of curvature of the image side surface of the sixth lens L6
  • R13 the radius of curvature of the object side surface of the seventh lens L7
  • R14 the radius of curvature of the image side surface of the seventh lens L7
  • R15 the radius of curvature of the object side of the eighth lens L8
  • R16 The radius of curvature of the image side surface of the eighth lens L8
  • R17 The curvature radius of the object side surface of the glass plate GF
  • d the center thickness of the lens or the distance between the lenses
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2
  • nd1 the refractive index of the d-line of the first lens L1
  • nd2 the refractive index of the d-line of the second lens L2
  • ndg the refractive index of the d-line of the glass plate GF
  • TTL optical length (the on-axis distance from the object side of the first lens L1 to the image surface)
  • the aspheric surface of each lens surface uses the aspheric surface shown in equation (7).
  • the present invention is not limited to the aspheric polynomial of equation (7).
  • FIG. 1 is a configuration diagram showing the arrangement of an imaging lens LA of Example 1.
  • the first lens L1 to the eighth lens L8 constituting the imaging lens LA of Example 1 have the respective object side and image side curvature radii R, lens center thickness or inter-lens distance d, refractive index nd, and Abbe number v as shown in the table
  • the conic coefficient k and aspheric coefficients are shown in Table 2
  • 2 ⁇ , Fno, f, f1, f2, f3, f4, f5, f6, f7, f8, TTL, IH are shown in Table 3.
  • Table 13 to be described later shows values corresponding to the parameters defined by the relational expressions (1) to (6) of each of Examples 1 to 4.
  • the spherical aberration, curvature of field, and distortion of the imaging lens LA of Embodiment 1 are shown in FIG. 2.
  • S in the curvature of field in the figure is the curvature of field on the sagittal image surface
  • T is the curvature of field on the meridional image surface, and the same applies to the second to fourth embodiments.
  • FIG. 3 is a configuration diagram showing the arrangement of the imaging lens LA of the second embodiment.
  • the first lens L1 to the eighth lens L8 constituting the imaging lens LA of Example 2 have the respective object side and image side curvature radii R, lens center thickness or inter-lens distance d, refractive index nd, and Abbe number v as shown in the table
  • the conic coefficient k and aspheric coefficients are shown in Table 5, and 2 ⁇ , Fno, f, f1, f2, f3, f4, f5, f6, f7, f8, TTL, IH are shown in Table 6.
  • Example 2 satisfies relational expressions (1) to (6).
  • the spherical aberration, curvature of field, and distortion of the imaging lens LA of Embodiment 2 are shown in FIG. 4.
  • FIG. 5 is a configuration diagram showing the arrangement of imaging lens LA of Example 3.
  • the first lens L1 to the eighth lens L8 constituting the imaging lens LA of Example 3 have the respective object side and image side curvature radii R, lens center thickness or inter-lens distance d, refractive index nd, and Abbe number v as shown in the table
  • the conic coefficient k and aspheric coefficients are shown in Table 8
  • 2 ⁇ , Fno, f, f1, f2, f3, f4, f5, f6, f7, f8, TTL, IH are shown in Table 9.
  • Example 3 as shown in Table 13, satisfies relational expressions (1) to (6).
  • the spherical aberration, curvature of field, and distortion of the imaging lens LA of the third embodiment are shown in FIG. 6.
  • FIG. 7 is a configuration diagram showing the arrangement of imaging lens LA of Example 4.
  • the first lens L1 to the eighth lens L8 constituting the imaging lens LA of Example 4 have respective object side and image side curvature radii R, lens center thickness or inter-lens distance d, refractive index nd, and Abbe number v as shown in the table
  • the conic coefficient k and aspheric coefficients are shown in Table 11. 2 ⁇ , Fno, f, f1, f2, f3, f4, f5, f6, f7, f8, TTL, IH are shown in Table 12.
  • Example 4 as shown in Table 13, satisfies relational expressions (1) to (6).
  • the spherical aberration, curvature of field, and distortion of the imaging lens LA of the embodiment 4 are shown in FIG. 8.
  • Table 13 shows values corresponding to the parameters defined by the relational expressions (1) to (6) of Examples 1 to 4.
  • Example 2 Example 3
  • Example 4 Remark v1-v2 5.047 19.929 10.759 14.546 (1) formula v2-v3 29.129 20.758 25.543 21.757 (2) formula (d1+d3)/d2 4.050 11.950 7.563 10.000 (3) formula R3/R4 0.305 0.495 0.400 0.400 (4) formula
  • R1 the radius of curvature of the object side of the first lens L1
  • R2 the radius of curvature of the image side surface of the first lens L1
  • R3 the radius of curvature of the object side of the second lens L2
  • R4 the radius of curvature of the image side surface of the second lens L2
  • R5 the radius of curvature of the object side surface of the third lens L3
  • R6 the radius of curvature of the image side surface of the third lens L3
  • R7 The curvature radius of the object side of the fourth lens L4
  • R8 the radius of curvature of the image side surface of the fourth lens L4
  • R9 the radius of curvature of the object side surface of the fifth lens L5
  • R10 the radius of curvature of the image side surface of the fifth lens L5
  • R11 the radius of curvature of the object side surface of the sixth lens L6
  • R12 the radius of curvature of the image side surface of the sixth lens L6
  • R13 the radius of curvature of the object side surface of the seventh lens L7
  • R14 the radius of curvature of the image side surface of the seventh lens L7
  • R15 the radius of curvature of the object side of the eighth lens L8
  • R16 The radius of curvature of the image side surface of the eighth lens L8
  • R17 The curvature radius of the object side surface of the glass plate GF
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2
  • d18 The on-axis distance from the image side surface of the glass plate GF to the image surface.

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Abstract

低高度、广角且具有良好的光学特性的利用8片透镜而构成的摄像镜头。摄像镜头从物侧起依次配置有具有正屈折力的第一透镜（L1）、具有正屈折力的第二透镜（L2）、具有负屈折力的第三透镜（L3）、具有正屈折力的第四透镜（L4）、具有负屈折力的第五透镜（L5）、具有正屈折力的第六透镜（L6）、具有正或负屈折力的第七透镜（L7）以及具有负屈折力的第八透镜（L8），且满足给定的关系式。

Description

摄像镜头 技术领域
本发明涉及摄像镜头，尤其涉及适合于采用高像素用CCD、CMOS等摄像元件的便携式用模块相机、WEB相机等的、低高度化为TTL(光学长度)/IH(像高)＜1.35、全视场角(以下，设为2ω)为80°以上的广角且具有良好的光学特性的利用8片透镜而构成的摄像镜头。
背景技术
近年，采用CCD、CMOS等摄像元件的各种摄像装置广泛普及。伴随这些摄像元件的小型化、高性能化，寻求低高度、广角且具有良好的光学特性的摄像镜头。
与低高度、广角且具有良好的光学特性的利用8片透镜而构成的摄像镜头相关的技术开发正在推进。作为该8片透镜结构的摄像镜头，在专利文献1中提出了如下摄像镜头：从物侧起依次配置有具有正屈折力的第一透镜、具有正屈折力的第二透镜、具有负屈折力的第三透镜、具有正屈折力的第四透镜、具有负屈折力的第五透镜、具有正屈折力的第六透镜、具有负屈折力的第七透镜以及具有负屈折力的第八透镜。
关于专利文献1的实施例4、5、6中公开的摄像镜头，第一透镜的阿贝数与第二透镜的阿贝数之差、第二透镜的阿贝数与第三透镜的阿贝数之差不充分，因此低高度化以及广角化不充分。
(在先技术文献)
(专利文献)
专利文献1：JP特开2017-116594号公报
发明内容
(发明要解决的课题)
本发明的目的在于提供低高度、广角且具有良好的光学特性的利用8片透镜而构成的摄像镜头。
(用于解决课题的技术方案)
为了达成上述目标，对各透镜的功率配置、第一透镜的阿贝数与第二透镜的阿贝数之差、第二透镜的阿贝数与第三透镜的阿贝数之差进行了锐意探讨，结果发现可得到改善了现有技术的课题的摄像镜头，从而完成本发明。
技术方案1记载的摄像镜头从物侧起依次配置有具有正屈折力的第一透镜、具有正屈折力的第二透镜、具有负屈折力的第三透镜、具有正屈折力的第四透镜、具有负屈折力的第五透镜、具有正屈折力的第六透镜、具有正屈折力或负屈折力的第七透镜以及具有负屈折力的第八透镜，且满足以下的关系式(1)和(2)：
5.00≤v1－v2≤20.00  (1)
20.00≤v2－v3≤30.00  (2)
其中，
v1表示第一透镜的阿贝数，
v2表示第二透镜的阿贝数，
v3表示第三透镜的阿贝数。
技术方案2记载的摄像镜头是在技术方案1记载的摄像镜头的基础上，满足以下的关系式(3)：
4.00≤(d1+d3)/d2≤12.00  (3)
其中，
d1表示第一透镜的中心厚度，
d2表示从第一透镜的像侧面到第二透镜的物侧面的轴上距离，
d3表示第二透镜的中心厚度。
技术方案3记载的摄像镜头是在技术方案1记载的摄像镜头的基础上，满足以下的关系式(4)：
0.30≤R3/R4≤0.50  (4)
其中，
R3表示第二透镜的物侧面的曲率半径，
R4表示第二透镜的像侧面的曲率半径。
技术方案4记载的摄像镜头是在技术方案1记载的摄像镜头的基础上，满足以下的关系式(5)：
3.00≤|R5/R6|≤15.00  (5)
其中，
R5表示第三透镜的物侧面的曲率半径，
R6表示第三透镜的像侧面的曲率半径。
技术方案5记载的摄像镜头是在技术方案1记载的摄像镜头的基础上，满足以下的关系式(6)：
0.005≤d4/f≤0.010  (6)
其中，
f表示摄像镜头整体的焦距，
d4表示从第二透镜的像侧面到第三透镜的物侧面的轴上距离。
(发明效果)
根据本发明，尤其能提供一种摄像镜头，适合于采用高像素用CCD、CMOS等摄像元件的便携式用模块相机、WEB相机等，低高度化为TTL(光学长度)/IH(像高)＜1.35，保证2ω＞80°以上的广角，且具有良好的光学特性，利用8片透镜而构成。
附图说明
图1是表示本发明的实施例1的摄像镜头LA的概略构成的图。
图2是表示本发明的实施例1的摄像镜头LA的球差、场曲、畸变的 图。
图3是表示本发明的实施例2的摄像镜头LA的概略构成的图。
图4是表示本发明的实施例2的摄像镜头LA的球差、场曲、畸变的图。
图5是表示本发明的实施例3的摄像镜头LA的概略构成的图。
图6是表示本发明的实施例3的摄像镜头LA的球差、场曲、畸变的图。
图7是表示本发明的实施例4的摄像镜头LA的概略构成的图。
图8是表示本发明的实施例4的摄像镜头LA的球差、场曲、畸变的图。
具体实施方式
针对本发明所涉及的摄像镜头的实施方式进行说明。该摄像镜头LA具备透镜系统，该透镜系统是从物侧向像侧配置有第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7以及第八透镜L8的8片透镜结构。在第八透镜L8与像面之间配置玻璃平板GF。作为该玻璃平板GF，设想了盖板玻璃以及各种滤光片等。在本发明中，玻璃平板GF可以配置于不同位置，还可以省略。
第一透镜L1是具有正屈折力的透镜，第二透镜L2是具有正屈折力的透镜，第三透镜L3是具有负屈折力的透镜，第四透镜L4是具有正屈折力的透镜，第五透镜L5是具有负屈折力的透镜，第六透镜L6是具有正屈折力的透镜，第七透镜L7是具有正屈折力或负屈折力的透镜，第八透镜L8是具有负屈折力的透镜。关于这8片透镜的表面，为了良好地校正诸像差，期望将所有面设为非球面形状。
该摄像镜头LA满足以下的关系式(1)、(2)：
5.00≤v1－v2≤20.00  (1)
20.00≤v2－v3≤30.00  (2)
其中，
v1：第一透镜的阿贝数
v2：第二透镜的阿贝数
v3：第三透镜的阿贝数。
关系式(1)规定第一透镜L1的阿贝数v1与第二透镜L2的阿贝数v2之差。在处于关系式(1)的范围外时，伴随广角、低高度化，轴上、轴外的色差的校正变难，因此不优选。
关系式(2)规定第二透镜L2的阿贝数v2与第三透镜L3的阿贝数v3之差。在处于关系式(2)的范围外时，伴随广角、低高度化，轴上、轴外的色差的校正变难，因此不优选。
该摄像镜头LA满足以下的关系式(3)：
4.00≤(d1+d3)/d2≤12.00  (3)
其中，
d1：第一透镜的中心厚度
d2：从第一透镜的像侧面到第二透镜的物侧面的轴上距离
d3：第二透镜的中心厚度。
关系式(3)规定第一透镜L1的中心厚度、第二透镜L2的中心厚度、以及从第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离的关系。在处于关系式(3)的范围内时，具有良好的光学特性的广角、低高度化容易，因此优选。
该摄像镜头LA满足以下的关系式(4)：
0.30≤R3/R4≤0.50  (4)
其中，
R3：第二透镜的物侧面的曲率半径
R4：第二透镜的像侧面的曲率半径。
关系式(4)规定第二透镜L2的物侧面的曲率半径R3与第二透镜L2的像侧面的曲率半径R4之比。在处于关系式(4)的范围内时，具有良好的光学特性的广角、低高度化容易，因此优选。
该摄像镜头LA满足以下的关系式(5)：
3.00≤|R5/R6|≤15.00  (5)
其中，
R5：第三透镜的物侧面的曲率半径
R6：第三透镜的像侧面的曲率半径。
关系式(5)规定第三透镜L3的物侧面的曲率半径R5与第三透镜L3的像侧面的曲率半径R6之比。在处于关系式(5)的范围内时，具有良好的光学特性的广角、低高度化容易，因此优选。
该摄像镜头LA满足以下的关系式(6)：
0.005≤d4/f≤0.010  (6)
其中，
f：摄像镜头整体的焦距
d4：从第二透镜的像侧面到第三透镜的物侧面的轴上距离。
关系式(6)规定从第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离与摄像镜头整体的焦距f之比。在处于关系式(6)的范围内时，具有良好的光学特性的广角、低高度化容易，因此优选。
构成摄像镜头LA的8片透镜分别满足上述构成以及关系式，从而能得到低高度化为TTL(光学长度)/IH(像高)＜1.35、保证2ω＞80°以上的广角且具有良好的光学特性的利用8片透镜而构成的摄像镜头。
(实施例)
以下，使用实施例来说明本发明的摄像镜头LA。各实施例记载的记号如下所示。此外，距离、半径以及中心厚度的单位是mm。
f：摄像镜头LA整体的焦距
f1：第一透镜L1的焦距
f2：第二透镜L2的焦距
f3：第三透镜L3的焦距
f4：第四透镜L4的焦距
f5：第五透镜L5的焦距
f6：第六透镜L6的焦距
f7：第七透镜L7的焦距
f8：第八透镜L8的焦距
Fno：F值
2ω：全视场角
S1：开口光圈
R：光学面的曲率半径，透镜的情况下为中心曲率半径
R1：第一透镜L1的物侧面的曲率半径
R2：第一透镜L1的像侧面的曲率半径
R3：第二透镜L2的物侧面的曲率半径
R4：第二透镜L2的像侧面的曲率半径
R5：第三透镜L3的物侧面的曲率半径
R6：第三透镜L3的像侧面的曲率半径
R7：第四透镜L4的物侧面的曲率半径
R8：第四透镜L4的像侧面的曲率半径
R9：第五透镜L5的物侧面的曲率半径
R10：第五透镜L5的像侧面的曲率半径
R11：第六透镜L6的物侧面的曲率半径
R12：第六透镜L6的像侧面的曲率半径
R13：第七透镜L7的物侧面的曲率半径
R14：第七透镜L7的像侧面的曲率半径
R15：第八透镜L8的物侧面的曲率半径
R16：第八透镜L8的像侧面的曲率半径
R17：玻璃平板GF的物侧面的曲率半径
R18：玻璃平板GF的像侧面的曲率半径
d：透镜的中心厚度或透镜间距离
d0：从开口光圈S1到第一透镜L1的物侧面的轴上距离
d1：第一透镜L1的中心厚度
d2：从第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离
d3：第二透镜L2的中心厚度
d4：从第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离
d5：第三透镜L3的中心厚度
d6：从第三透镜L3的像侧面到第四透镜L4的物侧面的轴上距离
d7：第四透镜L4的中心厚度
d8：从第四透镜L4的像侧面到第五透镜L5的物侧面的轴上距离
d9：第五透镜L5的中心厚度
d10：从第五透镜L5的像侧面到第六透镜L6的物侧面的轴上距离
d11：第六透镜L6的中心厚度
d12：从第六透镜L6的像侧面到第七透镜L7的物侧面的轴上距离
d13：第七透镜L7的中心厚度
d14：从第七透镜L7的像侧面到第八透镜L8的物侧面的轴上距离
d15：第八透镜L8的中心厚度
d16：从第八透镜L8的像侧面到玻璃平板GF的物侧面的轴上距离
d17：玻璃平板GF的中心厚度
d18：从玻璃平板GF的像侧面到像面的轴上距离
nd：d线的折射率
nd1：第一透镜L1的d线的折射率
nd2：第二透镜L2的d线的折射率
nd3：第三透镜L3的d线的折射率
nd4：第四透镜L4的d线的折射率
nd5：第五透镜L5的d线的折射率
nd6：第六透镜L6的d线的折射率
nd7：第七透镜L7的d线的折射率
nd8：第八透镜L8的d线的折射率
ndg：玻璃平板GF的d线的折射率
v：阿贝数
v1：第一透镜L1的阿贝数
v2：第二透镜L2的阿贝数
v3：第三透镜L3的阿贝数
v4：第四透镜L4的阿贝数
v5：第五透镜L5的阿贝数
v6：第六透镜L6的阿贝数
v7：第七透镜L7的阿贝数
v8：第八透镜L8的阿贝数
vg：玻璃平板GF的阿贝数
TTL：光学长度(从第一透镜L1的物侧面到像面的轴上距离)
LB：从第八透镜L8的像侧面到像面的轴上距离(包含玻璃平板GF的厚度)
y＝(x 2/R)/[1+{1－(k+1)(x 2/R 2)} 1/2]+A4x 4+A6x 6+A8x 8+A10x 10+A12x 12+A14x 14+A16x 16+A18x 18+A20x 20    (7)
为方便起见，各透镜面的非球面使用式(7)中所示的非球面。然而，本发明不限于该式(7)的非球面多项式。
(实施例1)
图1是表示实施例1的摄像镜头LA的配置的构成图。构成实施例1 的摄像镜头LA的第一透镜L1～第八透镜L8的各自的物侧以及像侧的曲率半径R、透镜中心厚度或透镜间距离d、折射率nd、阿贝数v如表1所示，圆锥系数k、非球面系数如表2所示，2ω、Fno、f、f1、f2、f3、f4、f5、f6、f7、f8、TTL、IH如表3所示。
(表1)
Figure PCTCN2020132267-appb-000001
                                   参照波长＝588nm
(表2)
Figure PCTCN2020132267-appb-000002
(表3)
2ω(°) 81.91
Fno 1.75
f(mm) 6.727
f1(mm) 10.991
f2(mm) 8.177
f3(mm) -14.191
f4(mm) 22.507
f5(mm) -16.501
f6(mm) 24.988
f7(mm) 36.765
f8(mm) -6.826
TTL(mm) 7.816
LB(mm) 1.034
IH(mm) 6.016
TTL/IH 1.299
后述的表13示出与各实施例1～4的关系式(1)～(6)规定的参数对应的值。
实施例1的摄像镜头LA的球差、场曲、畸变如图2所示。此外，图的场曲的S是针对弧矢像面的场曲，T是针对子午像面的场曲，在实施例2～4中也同样。实施例1的摄像镜头LA如图2所示可知，2ω＝81.91°，广角低高度化为TTL/IH＝1.299，具有良好的光学特性。
(实施例2)
图3是表示实施例2的摄像镜头LA的配置的构成图。构成实施例2的摄像镜头LA的第一透镜L1～第八透镜L8的各自的物侧以及像侧的曲率半径R、透镜中心厚度或透镜间距离d、折射率nd、阿贝数v如表4所示，圆锥系数k、非球面系数如表5所示，2ω、Fno、f、f1、f2、f3、f4、f5、f6、f7、f8、TTL、IH如表6所示。
(表4)
Figure PCTCN2020132267-appb-000003
                                  参照波长＝588nm
(表5)
Figure PCTCN2020132267-appb-000004
(表6)
2ω(°) 83.78
Fno 1.75
f(mm) 6.526
f1(mm) 7.760
f2(mm) 14.322
f3(mm) -13.140
f4(mm) 19.317
f5(mm) -27.554
f6(mm) 14.748
f7(mm) -129.721
f8(mm) -6.290
TTL(mm) 7.815
LB(mm) 0.913
IH(mm) 6.016
TTL/IH 1.299
实施例2如表13所示，满足关系式(1)～(6)。
实施例2的摄像镜头LA的球差、场曲、畸变如图4所示。实施例2的摄像镜头LA如图4所示可知，2ω＝83.78°，广角低高度化为TTL/IH＝1.299，具有良好的光学特性。
(实施例3)
图5是表示实施例3的摄像镜头LA的配置的构成图。构成实施例3的摄像镜头LA的第一透镜L1～第八透镜L8的各自的物侧以及像侧的曲率半径R、透镜中心厚度或透镜间距离d、折射率nd、阿贝数v如表7所示，圆锥系数k、非球面系数如表8所示，2ω、Fno、f、f1、f2、f3、f4、f5、f6、f7、f8、TTL、IH如表9所示。
(表7)
Figure PCTCN2020132267-appb-000005
                                参照波长＝588nm
(表8)
Figure PCTCN2020132267-appb-000006
(表9)
2ω(°) 85.50
Fno 1.55
f(mm) 6.354
f1(mm) 12.656
f2(mm) 9.957
f3(mm) -17.208
f4(mm) 23.148
f5(mm) -30.800
f6(mm) 7.550
f7(mm) -29.894
f8(mm) -5.562
TTL(mm) 8.053
LB(mm) 0.997
IH(mm) 6.016
TTL/IH 1.339
实施例3如表13所示，满足关系式(1)～(6)。
实施例3的摄像镜头LA的球差、场曲、畸变如图6所示。实施例3的摄像镜头LA如图6所示可知，2ω＝85.50°，广角低高度化为TTL/IH＝1.339，具有良好的光学特性。
(实施例4)
图7是表示实施例4的摄像镜头LA的配置的构成图。构成实施例4的摄像镜头LA的第一透镜L1～第八透镜L8的各自的物侧以及像侧的曲率半径R、透镜中心厚度或透镜间距离d、折射率nd、阿贝数v如表10所示，圆锥系数k、非球面系数如表11所示，2ω、Fno、f、f1、f2、f3、f4、f5、f6、f7、f8、TTL、IH如表12所示。
(表10)
Figure PCTCN2020132267-appb-000007
                                  参照波长＝588nm
(表11)
Figure PCTCN2020132267-appb-000008
(表12)
2ω(°) 85.97
Fno 1.95
f(mm) 6.303
f1(mm) 10.885
f2(mm) 11.333
f3(mm) -18.978
f4(mm) 34.543
f5(mm) -41.316
f6(mm) 10.834
f7(mm) -199.137
f8(mm) -5.310
TTL(mm) 7.500
LB(mm) 0.942
IH(mm) 6.016
TTL/IH 1.247
实施例4如表13所示，满足关系式(1)～(6)。
实施例4的摄像镜头LA的球差、场曲、畸变如图8所示。实施例4的摄像镜头LA如图8所示可知，2ω＝85.97°，广角低高度化为TTL/IH＝1.247，具有良好的光学特性。
表13示出与实施例1～4的关系式(1)～(6)规定的参数对应的值。
(表13)
  实施例1 实施例2 实施例3 实施例4 备注
v1-v2 5.047 19.929 10.759 14.546 (1)式
v2-v3 29.129 20.758 25.543 21.757 (2)式
(d1+d3)/d2 4.050 11.950 7.563 10.000 (3)式
R3/R4 0.305 0.495 0.400 0.400 (4)式
|R5/R6| 3.050 14.950 10.000 6.000 (5)式
d4/f 0.006 0.009 0.008 0.006 (6)式
(标号说明)
LA：摄像镜头
L1：第一透镜
L2：第二透镜
L3：第三透镜
L4：第四透镜
L5：第五透镜
L6：第六透镜
L7：第七透镜
L8：第八透镜
GF：玻璃平板
R1：第一透镜L1的物侧面的曲率半径
R2：第一透镜L1的像侧面的曲率半径
R3：第二透镜L2的物侧面的曲率半径
R4：第二透镜L2的像侧面的曲率半径
R5：第三透镜L3的物侧面的曲率半径
R6：第三透镜L3的像侧面的曲率半径
R7：第四透镜L4的物侧面的曲率半径
R8：第四透镜L4的像侧面的曲率半径
R9：第五透镜L5的物侧面的曲率半径
R10：第五透镜L5的像侧面的曲率半径
R11：第六透镜L6的物侧面的曲率半径
R12：第六透镜L6的像侧面的曲率半径
R13：第七透镜L7的物侧面的曲率半径
R14：第七透镜L7的像侧面的曲率半径
R15：第八透镜L8的物侧面的曲率半径
R16：第八透镜L8的像侧面的曲率半径
R17：玻璃平板GF的物侧面的曲率半径
R18：玻璃平板GF的像侧面的曲率半径
d0：从开口光圈S1到第一透镜L1的物侧面的轴上距离
d1：第一透镜L1的中心厚度
d2：从第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离
d3：第二透镜L2的中心厚度
d4：从第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离
d5：第三透镜L3的中心厚度
d6：从第三透镜L3的像侧面到第四透镜L4的物侧面的轴上距离
d7：第四透镜L4的中心厚度
d8：从第四透镜L4的像侧面到第五透镜L5的物侧面的轴上距离
d9：第五透镜L5的中心厚度
d10：从第五透镜L5的像侧面到第六透镜L6的物侧面的轴上距离
d11：第六透镜L6的中心厚度
d12：从第六透镜L6的像侧面到第七透镜L7的物侧面的轴上距离
d13：第七透镜L7的中心厚度
d14：从第七透镜L7的像侧面到第八透镜L8的物侧面的轴上距离
d15：第八透镜L8的中心厚度
d16：从第八透镜L8的像侧面到玻璃平板GF的物侧面的轴上距离
d17：玻璃平板GF的中心厚度
d18：从玻璃平板GF的像侧面到像面的轴上距离。

Claims (5)

  1. 一种摄像镜头，其特征在于，
    从物侧起依次配置有具有正屈折力的第一透镜、具有正屈折力的第二透镜、具有负屈折力的第三透镜、具有正屈折力的第四透镜、具有负屈折力的第五透镜、具有正屈折力的第六透镜、具有正屈折力或负屈折力的第七透镜以及具有负屈折力的第八透镜，且满足以下的关系式(1)和(2)：
    5.00≤v1－v2≤20.00  (1)
    20.00≤v2－v3≤30.00  (2)
    其中，
    v1表示第一透镜的阿贝数，
    v2表示第二透镜的阿贝数，
    v3表示第三透镜的阿贝数。
  2. 根据权利要求1所述的摄像镜头，其特征在于，
    所述摄像镜头满足以下的关系式(3)：
    4.00≤(d1+d3)/d2≤12.00  (3)
    其中，
    d1表示第一透镜的中心厚度，
    d2表示从第一透镜的像侧面到第二透镜的物侧面的轴上距离，
    d3表示第二透镜的中心厚度。
  3. 根据权利要求1所述的摄像镜头，其特征在于，
    所述摄像镜头满足以下的关系式(4)：
    0.30≤R3/R4≤0.50  (4)
    其中，
    R3表示第二透镜的物侧面的曲率半径，
    R4表示第二透镜的像侧面的曲率半径。
  4. 根据权利要求1所述的摄像镜头，其特征在于，
    所述摄像镜头满足以下的关系式(5)：
    3.00≤|R5/R6|≤15.00  (5)
    其中，
    R5表示第三透镜的物侧面的曲率半径，
    R6表示第三透镜的像侧面的曲率半径。
  5. 根据权利要求1所述的摄像镜头，其特征在于，
    所述摄像镜头满足以下的关系式(6)：
    0.005≤d4/f≤0.010  (6)
    其中，
    f表示摄像镜头整体的焦距，
    d4表示从第二透镜的像侧面到第三透镜的物侧面的轴上距离。
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