WO2021258611A1 - 折反射光学系统的摄像镜头 - Google Patents

折反射光学系统的摄像镜头 Download PDF

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WO2021258611A1
WO2021258611A1 PCT/CN2020/127917 CN2020127917W WO2021258611A1 WO 2021258611 A1 WO2021258611 A1 WO 2021258611A1 CN 2020127917 W CN2020127917 W CN 2020127917W WO 2021258611 A1 WO2021258611 A1 WO 2021258611A1
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lens
optical system
catadioptric optical
refraction
ttl
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PCT/CN2020/127917
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English (en)
French (fr)
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新田耕二
山崎郁
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诚瑞光学(深圳)有限公司
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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
    • 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
    • G02B13/0035—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 three lenses
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
    • 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
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines

Definitions

  • the present invention relates to the field of optical lenses, in particular to the invention of imaging lenses related to narrow-angle lenses of small catadioptric optical systems.
  • Patent Document 1 proposes an imaging lens having a first lens and a second lens arranged with an air gap from the object side. On the object side of the first lens, A first refracting surface is formed in the peripheral area, a second reflecting surface is formed in the central area, a first reflecting surface is formed in the peripheral area on the image side surface of the second lens, and a second refracting surface is formed in the central area.
  • the ratio of the refractive index of the peripheral region of the first and second lenses to the Abbe number, and the refractive index of the peripheral region of the first and second lenses The ratio of the focal length to the central area of the second lens is not sufficient, so the angle of view is 21.4° or more, and the narrowing of the angle is not enough.
  • Patent Document 1 JP JP 2018-109673 No.
  • the object of the present invention is to provide an imaging lens of a catadioptric optical system, which has a low height, a narrow angle and good optical characteristics, and is composed of two lens components and a lens group.
  • the ratio of the refractive index of the first lens component and the second lens component to the Abbe number, the ratio of the refractive index of the first lens component and the second lens component to the combined focal length of the third lens group was determined.
  • the imaging lens described in claim 1 is an imaging lens of a catadioptric optical system. From the object side, a first lens assembly having reflectivity and refractive power, a second lens assembly having reflectivity and refractive power, and a refractive index are arranged in order from the object side. A powerful third lens group.
  • the object side of the first lens assembly has a first refractive surface in the peripheral area and a second reflective surface in the central area.
  • the image side of the first lens assembly extends from the peripheral area to the central area. It has a second refraction surface, a fifth refraction surface and a sixth refraction surface in sequence.
  • the object side surface of the second lens assembly has a third refraction surface and a fourth refraction surface in sequence from the peripheral area to the central area.
  • the image side surface of the component has a first reflecting surface, and the imaging lens of the catadioptric optical system satisfies the following relational expressions (1) to (2):
  • nd1 represents the refractive index of the d-line of the first lens
  • nd2 represents the refractive index of the d-line of the second lens
  • ⁇ 1 represents the Abbe number of the first lens assembly
  • ⁇ 2 represents the Abbe number of the second lens assembly
  • f3g represents the combined focal length of the third lens group.
  • the imaging lens described in Claim 2 is based on the imaging lens of the catadioptric optical system described in Claim 1, and satisfies the following relationship (3):
  • d9 represents the on-axis distance from the sixth refraction surface S8 to the seventh refraction surface S9
  • f3g represents the combined focal length of the third lens group.
  • the imaging lens described in Claim 3 is based on the imaging lens of the catadioptric optical system described in Claim 1, and satisfies the following relationship (4):
  • TTL stands for optical length, that is, the on-axis distance from the second reflecting surface to the image surface
  • f represents the focal length of the entire imaging lens of the catadioptric optical system.
  • the imaging lens described in Claim 4 is based on the imaging lens of the catadioptric optical system described in Claim 1, and satisfies the following relationship (5):
  • TTL stands for optical length, that is, the on-axis distance from the second reflecting surface to the image surface
  • f3g represents the combined focal length of the third lens group.
  • the imaging lens described in Claim 5 is based on the imaging lens of the catadioptric optical system described in Claim 1, and satisfies the following relationship (6):
  • TTL stands for optical length, that is, the on-axis distance from the second reflecting surface to the image surface
  • IH represents the maximum image height.
  • the small narrow-angle lens has the advantages of compact structure and small size. Provides low-height, narrow-angle, and good optical characteristics that are suitable for portable module cameras and web cameras that use high-pixel CCD, CMOS, and other imaging elements, using two lens components and one lens group to form a catadioptric reflection
  • the invention related to the imaging lens of the optical system.
  • 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 of the catadioptric optical system is equipped with a lens system using two lens components, a first lens component L1, a second lens component L2, and a third lens group Gr3, and a lens system arranged from the object side to the image side. It is composed of a lens group.
  • a glass plate GF is arranged between the third lens group Gr3 and the image surface. As this glass plate GF, cover glass, various filters, etc. are assumed. In the present invention, the glass plate GF may be arranged in a different position, and may also have an omitted configuration.
  • the lens assembly is configured with: a first lens assembly L1 with reflective power and refractive power, a second lens assembly L2 with reflective power and refractive power, and a third lens Gr3 with refractive power.
  • the object side surface has a first refraction surface S1 in the peripheral area and a second reflection surface S7 in the central area.
  • the image side surface of the first lens assembly L1 has a second refraction surface S2 and a fifth surface in order from the peripheral area to the central area.
  • the object side surface of the second lens assembly L2 has a third refractive surface S3 and a fourth refractive surface S5 in sequence from the peripheral area to the central area.
  • the side surface has a first reflective surface S4.
  • the lens surfaces of these two lens components and one lens group preferably have an aspherical shape on all surfaces.
  • the central region refers to the vicinity of the center of the lens surface when the optical axis of the lens is the center
  • the peripheral region refers to the region excluding the central region from the lens surface, and refers to the vicinity of the outer periphery of the lens surface.
  • the light incident on the first refraction surface S1 sequentially passes through the second refraction surface S2 and the third refraction surface S3 and then is reflected by the first reflection surface S4, passes through the fourth refraction surface S5 and the fifth refraction surface S6, and then enters the second refraction surface S5 and the fifth refraction surface S6.
  • the reflective surface S7 is further reflected by the second reflective surface S7, passes through the sixth refractive surface S8, and then enters the third lens group Gr3.
  • the first lens assembly L1 is an integrated structure
  • the second lens assembly L2 is an integrated structure
  • at least one of the first lens assembly and the second lens assembly may be a laminated lens.
  • the imaging lens LA of the catadioptric optical system satisfies the following relational expressions (1) to (2):
  • nd1 the refractive index of the d-line of the first lens
  • nd2 the refractive index of the d-line of the second lens
  • f3g The combined focal length of the third lens group.
  • the relational formula (1) specifies the ratio of the refractive index of the peripheral regions of the first and second lenses to the Abbe number. When it is outside the range of the relational expression (1), it is difficult to achieve a narrow angle and a low profile with good optical characteristics, which is not preferable.
  • the relational formula (2) specifies the ratio of the refractive index of the first lens component and the second lens component to the combined focal length of the third lens group. When it is outside the range of the relational expression (2), it becomes difficult to correct the chromatic aberration, which is not preferable.
  • the camera lens LA of the catadioptric optical system satisfies the following relationship (3):
  • f3g The combined focal length of the third lens group.
  • the relational formula (3) specifies the ratio of the air space on the axis of the first lens assembly L1 and the third lens group Gr3 to the combined focal length of the third lens group. When it is in the range of the relational expression (3), the narrow angle and low height with good optical characteristics are easy to be achieved, so it is preferable.
  • the camera lens LA of the catadioptric optical system satisfies the following relationship (4):
  • TTL Optical length (the on-axis distance from the second reflecting surface to the image surface)
  • f The focal length of the entire imaging lens of the catadioptric optical system.
  • Relation (4) specifies the ratio of optical length to focal length. If it is equal to or less than the upper limit value of the relational expression (4), the angle can be easily narrowed, and if it is equal to or more than the lower limit value, the correction of spherical aberration and coma aberration is easy, which is preferable.
  • the camera lens LA of the catadioptric optical system satisfies the following relationship (5):
  • TTL Optical length (the on-axis distance from the second reflecting surface to the image surface)
  • f3g The combined focal length of the third lens group.
  • the relationship (5) specifies the ratio of the optical length to the combined focal length of the third lens group Gr3. If it is equal to or less than the upper limit value of the relational expression (5), the angle can be easily narrowed, and if it is equal to or more than the lower limit value, correction of spherical aberration and coma aberration is easy, which is preferable.
  • the imaging lens LA of the catadioptric optical system satisfies the following relational expression (6).
  • TTL Optical length (the on-axis distance from the second reflecting surface to the image surface)
  • the relationship (6) specifies the ratio of the optical length to the maximum image height. If it is equal to or less than the upper limit of the relational expression (6), the optical length can be easily reduced in height relative to the image height. If it is more than the lower limit value, correction of spherical aberration and coma aberration is easy, so it is preferable.
  • the two lens components and one lens group constituting the imaging lens LA respectively satisfy the above-mentioned configuration and relational expressions, so that a low-height, narrow-angle, and good optical characteristic can be obtained using two lens components and one lens group.
  • the camera lens of the catadioptric optical system is the camera lens of the catadioptric optical system.
  • Example 1 examples are used to describe the imaging lens LA of the catadioptric optical system of the present invention.
  • the symbols described in Example 1 are as follows.
  • the unit of distance, radius, and center thickness is mm.
  • R The radius of curvature of the optical surface, in the case of a lens, it is the radius of curvature of the center
  • R1 the radius of curvature of the first refraction surface S1
  • R4 the radius of curvature of the first reflecting surface S4
  • R6 The radius of curvature of the fifth refraction surface S6
  • R7 the radius of curvature of the second reflecting surface S7
  • R12 the radius of curvature of the tenth refraction surface S12
  • d the center thickness of the lens or the distance between the lenses
  • TTL Optical length (the on-axis distance from the second reflecting surface S7 to the image surface)
  • the aspherical surface of each lens surface uses the aspherical 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 the catadioptric optical system of Example 1.
  • FIG. The radius of curvature R, the thickness of the center of the lens or the distance between the lenses d, the refractive index nd, and the radii of curvature R, the thickness of the center of the lens or the distance between the lenses of the first lens group L1 to the glass plate GF of the imaging lens LA constituting the catadioptric optical system of Example 1
  • the shell number ⁇ is shown in Table 1
  • the conic coefficient k and aspherical coefficient are shown in Table 2
  • 2 ⁇ , Fno, f, f3g, TTL, LB, and IH are shown in Table 3.
  • Table 13 to be described later shows values corresponding to the parameters specified in the relational expressions (1) to (6) of each of Examples 1 to 4.
  • Example 1 satisfies relational expressions (1) to (6).
  • the spherical aberration, curvature of field, and distortion of the imaging lens LA of the catadioptric optical system of Example 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 catadioptric optical system of Example 2.
  • FIG. The radius of curvature R, the thickness of the center of the lens or the distance between the lenses d, the refractive index nd, and the radii of curvature R on the object side and the image side of the imaging lens LA constituting the catadioptric optical system of Example 2 respectively.
  • the shell number ⁇ is shown in Table 4
  • the conic coefficient k and aspherical coefficient are shown in Table 5
  • 2 ⁇ , Fno, f, f3g, TTL, LB, and 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 the catadioptric optical system of Example 2 are shown in FIG. 4.
  • FIG. 5 is a configuration diagram showing the arrangement of the imaging lens LA of the catadioptric optical system of Example 3.
  • FIG. The curvature radius R, the thickness of the center of the lens or the distance between the lenses d, the refractive index nd, the respective object side and image side curvature radii R of the first lens assembly L1 to the glass plate GF of the imaging lens LA constituting the catadioptric optical system of Example 3
  • the shell number ⁇ is shown in Table 7, the conic coefficient k and aspherical coefficient are shown in Table 8, and 2 ⁇ , Fno, f, f3g, TTL, LB, and 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 catadioptric optical system of Example 3 are shown in FIG. 6.
  • FIG. 7 is a configuration diagram showing the arrangement of the imaging lens LA of the catadioptric optical system of Example 4.
  • FIG. The curvature radius R, the thickness of the center of the lens or the distance between the lenses d, the refractive index nd, and Abbe of the first lens L1 to the glass plate GF of the imaging lens LA constituting the catadioptric optical system of Example 4
  • the number ⁇ is shown in Table 10
  • the conic coefficient k and aspherical coefficient are shown in Table 11
  • 2 ⁇ , Fno, f, f3g, TTL, LB, and 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 catadioptric optical system of Example 4 are shown in FIG. 8.
  • Table 13 shows values corresponding to the parameters specified in the relational expressions (1) to (6) of Examples 1 to 4.
  • Example 4 Remark (nd1/v1)+(nd2/v2) 0.037 0.083 0.055 0.055 (1) formula (nd1+nd2)/f3g -0.395 -0.105 -0.250 -0.250 (2) formula d9/f3g -0.053 -0.005 -0.190 -0.106 (3) formula TTL/f 0.258 0.345 0.310 0.310 (4) formula TTL/f3g -0.836 -0.205 -0.537 -0.537 (5) formula TTL/IH 3.103 3.394 3.250 3.250 (6) formula

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Abstract

本发明提供低高度、窄角且具有良好的光学特性的利用2个透镜组件和1组透镜组而构成的折反射光学系统的摄像镜头。折反射光学系统的摄像镜头从物侧起依次配置具有反射力和屈折力的第一透镜组件、具有反射力和屈折力的第二透镜组件以及具有屈折力的第三透镜组，所述第一透镜组件的物侧面在周边区域具有第一折射面，在中心区域具有第二反射面，所述第一透镜组件的像侧面从周边区域向中心区域依次具有第二折射面、第五折射面和第六折射面，所述第二透镜组件的物侧面从周边区域向中心区域依次具有第三折射面和第四折射面，在所述第二透镜组件的像侧面具有第一反射面，满足给定的关系式。

Description

折反射光学系统的摄像镜头 技术领域
本发明涉及光学透镜的领域，尤其涉及与小型的折反射光学系统的窄角镜头相关的摄像镜头的发明。
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、窄角且具有良好的光学特性的折反射光学系统的摄像镜头。
与低高度、窄角且具有良好的光学特性的折反射光学系统的摄像镜头相关的技术开发正在推进。作为该折反射光学系统的摄像镜头，在专利文献1中提出了如下摄像镜头：从物侧起具有设置空气间隔而配置的第一透镜、以及第二透镜，在第一透镜的物侧面，在周边区域形成有第一折射面，在中心区域形成有第二反射面，在第二透镜的像侧面，在周边区域形成有第一反射面，在中心区域形成有第二折射面。
关于专利文献1的实施例1～5所记载的折反射光学系统的摄像镜头，第一及第二透镜周边区域的折射率与阿贝数之比、第一及第二透镜周边区域的折射率与第二透镜中心区域的焦距之比不充分，因此视场角为21.4°以上，窄角化不够。
(在先技术文献)
(专利文献)
专利文献1：JP特开2018-109673号公报
发明内容
(发明要解决的课题)
本发明的目的在于，提供一种折反射光学系统的摄像镜头，低高度、窄角且具有良好的光学特性，是利用2个透镜组件和1组透镜组而构成的。
(用于解决课题的技术方案)
为了达成上述目标，对第一透镜组件及第二透镜组件的折射率与阿贝数之比、第一透镜组件及第二透镜组件的折射率与第三透镜组的合成焦距之比进行了锐意探讨，结果发现可得到改善了现有技术的课题的折反射光学系统的摄像镜头，从而完成本发明。
技术方案1记载的摄像镜头是一种折反射光学系统的摄像镜头，从物侧起依次配置具有反射力和屈折力的第一透镜组件、具有反射力和屈折力的第二透镜组件以及具有屈折力的第三透镜组，所述第一透镜组件的物侧面在周边区域具有第一折射面，且在中心区域具有第二反射面，所述第一透镜组件的像侧面从周边区域向中心区域依次具有第二折射面、第五折射面以及第六折射面，所述第二透镜组件的物侧面从周边区域向中心区域依 次具有第三折射面以及第四折射面，在所述第二透镜组件的像侧面具有第一反射面，且所述折反射光学系统的摄像镜头满足以下的关系式(1)～(2)：
0.035≤(nd1/ν1)+(nd2/ν2)≤0.085  (1)
－0.40≤(nd1+nd2)/f3g≤－0.10  (2)
其中，
nd1表示第一透镜的d线的折射率，
nd2表示第二透镜的d线的折射率，
ν1表示第一透镜组件的阿贝数，
ν2表示第二透镜组件的阿贝数，
f3g表示第三透镜组的合成焦距。
技术方案2记载的摄像镜头是在技术方案1记载的折反射光学系统的摄像镜头的基础上，满足以下的关系式(3)：
－0.20≤d9/f3g≤0.00  (3)
其中，
d9表示从第六折射面S8到第七折射面S9的轴上距离，
f3g表示第三透镜组的合成焦距。
技术方案3记载的摄像镜头是在技术方案1记载的折反射光学系统的摄像镜头的基础上，满足以下的关系式(4)：
0.25≤TTL/f≤0.35  (4)
其中，
TTL表示光学长度，即，从第二反射面到像面的轴上距离，
f表示折反射光学系统的摄像镜头整体的焦距。
技术方案4记载的摄像镜头是在技术方案1记载的折反射光学系统的摄像镜头的基础上，满足以下的关系式(5)：
－0.85≤TTL/f3g≤－0.20  (5)
其中，
TTL表示光学长度，即，从第二反射面到像面的轴上距离，
f3g表示第三透镜组的合成焦距。
技术方案5记载的摄像镜头是在技术方案1记载的折反射光学系统的摄像镜头的基础上，满足以下的关系式(6)：
3.05≤TTL/IH≤3.40  (6)
其中，
TTL表示光学长度，即，从第二反射面到像面的轴上距离，
IH表示最大像高。
(发明效果)
根据本发明，尤其与现有技术相比较，通过配置由第一透镜组件、第二透镜组件以及第三透镜组构成的共轴2次的折反射光学系统的光路，从而具有透镜的衍射极限得以改善、实现长焦化这样的优点，小型窄角透镜 具有结构紧凑且小型这样的优点。提供适合采用高像素用CCD、CMOS等摄像元件的便携式用模块相机、WEB相机等的、低高度、窄角且具有良好的光学特性的利用2个透镜组件和1组透镜组而构成的折反射光学系统的摄像镜头所涉及的发明。
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折反射光学系统的摄像镜头的实施方式进行说明。该折反射光学系统的摄像镜头LA具备透镜系统，该透镜系统利用从物侧向像侧配置有第一透镜组件L1、第二透镜组件L2、第三透镜组Gr3这样的2个透镜组件和1组透镜组而构成。在第三透镜组Gr3与像面之间配置玻璃平板GF。作为该玻璃平板GF，设想盖板玻璃以及各种滤光片等。在本发明中，玻璃平板GF也可以配置于不同的位置，还能为省略的构成。
透镜组件配置有：具有反射力和屈折力的第一透镜组件L1、具有反射力和屈折力的第二透镜组件L2、以及具有屈折力的第三透镜Gr3，在所述第一透镜组件L1的物侧面，在周边区域具有第一折射面S1，且在中心区域具有第二反射面S7，所述第一透镜组件L1的像侧面从周边区域向中心区域依次具有第二折射面S2、第五折射面S6和第六折射面S8，所述第二透镜组件L2的物侧面从周边区域向中心区域依次具有第三折射面S3和第四折射面S5，在所述第二透镜组件L2的像侧面具有第一反射面S4。这2个透镜组件和1组透镜组的透镜表面为了良好地校正诸像差，优选将全部面设为非球面形状。
在此，中心区域是指以透镜的光轴为中心时的透镜面的中心附近，周边区域是指从透镜面中排除中心区域后的区域，是指透镜面的外周附近。
入射至第一折射面S1的光线依次在经过第二折射面S2和第三折射面S3后被第一反射面S4反射后，经过第四折射面S5和第五折射面S6而入射至第二反射面S7，进而被第二反射面S7反射后，经过第六折射面S8后入射至第三透镜组Gr3。
在本实施方式中，第一透镜组件L1是一体结构，第二透镜组件L2是一体结构。在其他实施方式中，第一透镜组件以及第二透镜组件的至少一者可以是贴合透镜。
该折反射光学系统的摄像镜头LA满足以下的关系式(1)～(2)：
0.035≤(nd1/ν1)+(nd2/ν2)≤0.085  (1)
－0.40≤(nd1+nd2)/f3g≤－0.10  (2)
其中，
nd1：第一透镜的d线的折射率
nd2：第二透镜的d线的折射率
ν1：第一透镜组件的阿贝数
ν2：第二透镜组件的阿贝数
f3g：第三透镜组的合成焦距。
关系式(1)规定第一及第二透镜周边区域的折射率与阿贝数之比。在处于关系式(1)的范围外时，具有良好的光学特性的窄角、低高度化困难，因此不优选。
关系式(2)规定第一透镜组件及第二透镜组件的折射率与第三透镜组的合成焦距之比。在处于关系式(2)的范围外时，色差的校正变难，因此不优选。
折反射光学系统的摄像镜头LA满足以下的关系式(3)：
－0.20≤d9/f3g≤0.00  (3)
其中，
d9：从第六折射面S8到第七折射面S9的轴上距离
f3g：第三透镜组的合成焦距。
关系式(3)规定第一透镜组件L1和第三透镜组Gr3的轴上的空气间隔与第三透镜组的合成焦距之比。在处于关系式(3)的范围内时，具有良好的光学特性的窄角、低高度化容易，因此优选。
折反射光学系统的摄像镜头LA满足以下的关系式(4)：
0.25≤TTL/f≤0.35  (4)
其中，
TTL：光学长度(从第二反射面到像面的轴上距离)
f：折反射光学系统的摄像镜头整体的焦距。
关系式(4)规定光学长度与焦距之比。若为关系式(4)的上限值以下，则窄角化容易，若为下限值以上，则球差以及彗差的校正容易，因此优选。
折反射光学系统的摄像镜头LA满足以下的关系式(5)：
－0.85≤TTL/f3g≤－0.20  (5)
其中，
TTL：光学长度(从第二反射面到像面的轴上距离)
f3g：第三透镜组的合成焦距。
关系式(5)规定光学长度与第三透镜组Gr3的合成焦距之比。若为关系式(5)的上限值以下，则窄角化容易，若为下限值以上，则球差以及彗差的校正容易，因此优选。
折反射光学系统的摄像镜头LA满足以下的关系式(6)。
3.05≤TTL/IH≤3.40  (6)
其中，
TTL：光学长度(从第二反射面到像面的轴上距离)
IH：最大像高。
关系式(6)规定光学长度与最大像高之比。若为关系式(6)的上限值以下，则容易实现光学长度相对于像高较大程度地低高度化。若为下限值以上，则球差以及彗差的校正容易，因此优选。
构成摄像镜头LA的2个透镜组件和1组透镜组分别满足上述构成以及关系式，从而能得到低高度、窄角且具有良好的光学特性的利用2个透镜组件和1组透镜组而构成的折反射光学系统的摄像镜头。
【实施例】
以下，使用实施例来说明本发明的折反射光学系统的摄像镜头LA。实施例1中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：折反射光学系统的摄像镜头LA整体的焦距
f3g：第三透镜组的合成焦距
Fno：F值
2ω：全视场角
STOP：开口光圈
R：光学面的曲率半径，在透镜的情况下为中心曲率半径
R1：第一折射面S1的曲率半径
R2：第二折射面S2的曲率半径
R3：第三折射面S3的曲率半径
R4：第一反射面S4的曲率半径
R5：第四折射面S5的曲率半径
R6：第五折射面S6的曲率半径
R7：第二反射面S7的曲率半径
R8：第六折射面S8的曲率半径
R9：第七折射面S9的曲率半径
R10：第八折射面S10的曲率半径
R11：第九折射面S11的曲率半径
R12：第十折射面S12的曲率半径
R13：玻璃平板GF的物侧面的曲率半径
R14：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
d1：第一折射面S1至第二折射面S2的轴上中心厚度
d2：从第二折射面S2到开口光圈STOP的轴上距离
d3：从开口光圈STOP到第三折射面S3的轴上距离
d4：第三折射面S3至第一反射面S4的轴上中心厚度
d5：第一反射面S4至第四折射面S5的轴上中心厚度
d6：从第四折射面S5到第五折射面S6的轴上距离
d7：第五折射面S6至第二反射面S7的轴上中心厚度
d8：第二反射面S7至第六折射面S8的轴上中心厚度
d9：从第六折射面S8到第七折射面S9的轴上距离
d10：第七折射面S9至第八折射面S10的轴上中心厚度
d11：从第八折射面S10到第九折射面S11的轴上距离
d12：从第九折射面S11到第十折射面S12的轴上中心厚度
d13：从第十折射面S12到玻璃平板GF的物侧面S13的轴上距离
d14：玻璃平板GF的中心厚度
d15：从玻璃平板GF的像侧面S12到像面的轴上距离
TTL：光学长度(从第二反射面S7到像面的轴上距离)
LB：从第三透镜组Gr3的像侧面到像面的轴上距离(包含玻璃平板GF的厚度)
IH：最大像高
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的折反射光学系统的摄像镜头LA的配置的构成图。构成实施例1的折反射光学系统的摄像镜头LA的第一透镜组L1～玻璃平板GF的各自的反射面以及折射面的曲率半径R、透镜中心厚度或透镜间距离d、折射率nd、阿贝数ν如表1所示，圆锥系数k、非球面系数如表2所示，2ω、Fno、f、f3g、TTL、LB、IH如表3所示。
(表1)
Figure PCTCN2020127917-appb-000001
                                                               参照波长＝588nm
(表2)
Figure PCTCN2020127917-appb-000002
(表3)
2ω(°) 9.52
Fno 1.75
f(mm) 24.500
f3g(mm) -7.570
TTL(mm) 6.330
LB(mm) 1.077
IH(mm) 2.040
后述的表13示出与在各实施例1～4的关系式(1)～(6)中规定的参数对应的值。
实施例1如表13所示，满足关系式(1)～(6)。
实施例1的折反射光学系统的摄像镜头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的折反射光学系统的摄像镜头LA如图2所示可知，2ω＝9.52°，窄角低高度化为TTL/f＝0.258，具有良好的光学特性。
(实施例2)
图3是表示实施例2的折反射光学系统的摄像镜头LA的配置的构成图。构成实施例2的折反射光学系统的摄像镜头LA的第一透镜组件L1～玻璃平板GF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ν如表4所示，圆锥系数k、非球面系数如表5所示，2ω、Fno、f、f3g、TTL、LB、IH如表6所示。
(表4)
Figure PCTCN2020127917-appb-000003
                                                             参照波长＝588nm
(表5)
Figure PCTCN2020127917-appb-000004
(表6)
2ω(°) 11.27
Fno 1.85
f(mm) 20.075
f3g(mm) -33.801
TTL(mm) 6.924
LB(mm) 1.610
IH(mm) 2.040
实施例2如表13所示，满足关系式(1)～(6)。
实施例2的折反射光学系统的摄像镜头LA的球差、场曲、畸变如图4所示。实施例2的折反射光学系统的摄像镜头LA如图4所示可知，2ω＝11.27°，窄角低高度化为TTL/f＝0.345，具有良好的光学特性。
(实施例3)
图5是表示实施例3的折反射光学系统的摄像镜头LA的配置的构成图。构成实施例3的折反射光学系统的摄像镜头LA的第一透镜组件L1～玻璃平板GF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ν如表7所示，圆锥系数k、非球面系数如表8所示，2ω、Fno、f、f3g、TTL、LB、IH如表9所示。
(表7)
Figure PCTCN2020127917-appb-000005
                                                              参照波长＝588nm
(表8)
Figure PCTCN2020127917-appb-000006
(表9)
2ω(°) 10.79
Fno 2.20
f(mm) 21.384
f3g(mm) -12.354
TTL(mm) 6.630
LB(mm) 0.998
IH(mm) 2.040
实施例3如表13所示，满足关系式(1)～(6)。
实施例3的折反射光学系统的摄像镜头LA的球差、场曲、畸变如图6所示。实施例3的折反射光学系统的摄像镜头LA如图6所示可知，2ω＝10.79°，窄角低高度化为TTL/f＝0.31，具有良好的光学特性。
(实施例4)
图7是表示实施例4的折反射光学系统的摄像镜头LA的配置的构成图。构成实施例4的折反射光学系统的摄像镜头LA的第一透镜L1～玻璃平板GF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ν如表10所示，圆锥系数k、非球面系数如表11所示，2ω、Fno、f、f3g、TTL、LB、IH如表12所示。
(表10)
Figure PCTCN2020127917-appb-000007
                                                                 参照波长＝588nm
(表11)
Figure PCTCN2020127917-appb-000008
(表12)
2ω(°) 10.58
Fno 1.88
f(mm) 21.387
f3g(mm) -12.355
TTL(mm) 6.630
LB(mm) 1.179
IH(mm) 2.040
实施例4如表13所示，满足关系式(1)～(6)。
实施例4的折反射光学系统的摄像镜头LA的球差、场曲、畸变如图8所示。实施例4的折反射光学系统的摄像镜头LA如图8所示可知，2ω＝10.58°，窄角低高度化为TTL/f＝0.31，具有良好的光学特性。
表13示出与在实施例1～4的关系式(1)～(6)中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
(nd1/v1)+(nd2/v2) 0.037 0.083 0.055 0.055 (1)式
(nd1+nd2)/f3g -0.395 -0.105 -0.250 -0.250 (2)式
d9/f3g -0.053 -0.005 -0.190 -0.106 (3)式
TTL/f 0.258 0.345 0.310 0.310 (4)式
TTL/f3g -0.836 -0.205 -0.537 -0.537 (5)式
TTL/IH 3.103 3.394 3.250 3.250 (6)式

Claims (5)

  1. 一种折反射光学系统的摄像镜头，其特征在于，
    从物侧起依次配置具有反射力和屈折力的第一透镜组件、具有反射力和屈折力的第二透镜组件以及具有屈折力的第三透镜组，所述第一透镜组件的物侧面在周边区域具有第一折射面，且在中心区域具有第二反射面，所述第一透镜组件的像侧面从周边区域向中心区域依次具有第二折射面、第五折射面以及第六折射面，所述第二透镜组件的物侧面从周边区域向中心区域依次具有第三折射面以及第四折射面，在所述第二透镜组件的像侧面具有第一反射面，且所述折反射光学系统的摄像镜头满足以下的关系式(1)～(2)：
    0.035≤(nd1/ν1)+(nd2/ν2)≤0.085  (1)
    －0.40≤(nd1+nd2)/f3g≤－0.10  (2)
    其中，
    nd1表示第一透镜的d线的折射率，
    nd2表示第二透镜的d线的折射率，
    ν1表示第一透镜组件的阿贝数，
    ν2表示第二透镜组件的阿贝数，
    f3g表示第三透镜组的合成焦距。
  2. 根据权利要求1所述的折反射光学系统的摄像镜头，其特征在于，
    所述折反射光学系统的摄像镜头满足以下的关系式(3)：
    －0.20≤d9/f3g≤0.00  (3)
    其中，
    d9表示从第六折射面到第七折射面的轴上距离，
    f3g表示第三透镜组的合成焦距。
  3. 根据权利要求1所述的折反射光学系统的摄像镜头，其特征在于，
    所述折反射光学系统的摄像镜头满足以下的关系式(4)：
    0.25≤TTL/f≤0.35  (4)
    其中，
    TTL表示光学长度，即，从第二反射面到像面的轴上距离，f表示折反射光学系统的摄像镜头整体的焦距。
  4. 根据权利要求1所述的折反射光学系统的摄像镜头，其特征在于，
    所述折反射光学系统的摄像镜头满足以下的关系式(5)：
    －0.85≤TTL/f3g≤－0.20  (5)
    其中，
    TTL表示光学长度，即，从第二反射面到像面的轴上距离，
    f3g表示第三透镜组的合成焦距。
  5. 根据权利要求1所述的折反射光学系统的摄像镜头，其特征在于，
    所述折反射光学系统的摄像镜头满足以下的关系式(6)：
    3.05≤TTL/IH≤3.40  (6)
    其中，
    TTL表示光学长度，即，从第二反射面到像面的轴上距离，
    IH表示最大像高。
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