CN114859533A - Zoom lens with fixed focal plane - Google Patents

Zoom lens with fixed focal plane Download PDF

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Publication number
CN114859533A
CN114859533A CN202210478311.3A CN202210478311A CN114859533A CN 114859533 A CN114859533 A CN 114859533A CN 202210478311 A CN202210478311 A CN 202210478311A CN 114859533 A CN114859533 A CN 114859533A
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Prior art keywords
component
lens
zoom lens
focal plane
single lens
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马冬林
范子超
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Wuhan Ouyi Optics Co ltd
Shenzhen Huazhong University of Science and Technology Research Institute
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Wuhan Ouyi Optics Co ltd
Shenzhen Huazhong University of Science and Technology Research Institute
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Priority to CN202210478311.3A priority Critical patent/CN114859533A/en
Publication of CN114859533A publication Critical patent/CN114859533A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • 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
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/22—Telecentric objectives or lens systems
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses a zoom lens with a fixed focal plane, which consists of a first component, a second component and a third component which are coaxially arranged in sequence, wherein the first component consists of a first single lens, a second single lens, a third single lens and a fourth single lens which are coaxially arranged in sequence; the sum of focal powers of the first component, the second component and the third component is 0, and Petzval field curvature is eliminated; the invention fills the gap of the optical information processing field and the precision measurement field for the requirement of a special zoom lens.

Description

Zoom lens with fixed focal plane
Technical Field
The invention relates to the field of optical design, in particular to a zoom lens with a fixed focal plane.
Background
In a general zoom lens, a focal length of a lens is changed within a certain range by a mechanical compensation method, an image plane remains unchanged in a zooming process, and different large images are formed under different fields of view, and the zoom lens is not suitable in certain environments, for example, in a frequently used 4f system, if light with different spatial frequencies is obtained by zooming, the focal plane of the lens needs to be kept fixed, so that a zoom lens with a fixed focal plane is urgently needed to solve the requirement.
Disclosure of Invention
In order to solve the above problems, the present invention provides a zoom lens with a fixed focal plane, wherein the zoom lens comprises a first component, a second component and a third component which are coaxially arranged in sequence, wherein the first component comprises a first single lens, a second single lens, a third single lens and a fourth single lens which are coaxially arranged in sequence, the second component comprises a fifth single lens and a sixth single lens which are coaxially arranged in sequence, and the third component comprises a seventh single lens, an eighth single lens, a ninth single lens and a tenth single lens which are coaxially arranged in sequence;
the sum of the optical powers of the first component, the second component and the third component is 0.
Preferably, the first component is at a distance d from the second component 1 ；
The distance from the second component to the third component is d 2 ；
φ i (i ═ 1,2,3) is the optical power of the ith component;
the first component and the second component form an equivalent Gaussian system of the zoom lens, and the optical focal length of the first system is as follows:
φ 12 ＝φ 1 +φ 2 -φ 1 φ 2 τ 12 τ 12 ＝d 1 。
preferably, the equivalent gaussian system and the second component constitute a zoom lens;
the focal power of the zoom lens is as follows:
φ＝φ 123 ＝φ 12 +φ 3 -φ 12 φ 3 τ 123 τ 123 ＝d 2 -d′ 12
Figure BDA0003626654270000021
preferably, the distance between the focal planes of the zoom lens remains constant during zooming, wherein the distance is expressed as:
D＝-S F +d 1 +d 2 +S′ F
wherein D represents the distance between focal planes, S F Is the distance, S ', from the first component to the front focal plane' F Is the distance from the last component to the back focal plane.
Preferably, d 1 The expression of (a) is:
Figure BDA0003626654270000022
wherein the content of the first and second substances,
Figure BDA0003626654270000023
preferably, d 2 The expression of (a) is:
(φ 1 +φ 2 )(φ 1 +φ 2 -φ 1 φ 2 d 1 )d 2 +(φ 1 2 d 1 -φ)＝0。
preferably, the first single lens and the second single lens constitute a first unit of the first component;
the third single lens and the fourth single lens constitute a second unit of the first component.
Preferably, the seventh single lens and the eighth single lens constitute a third unit of the third component;
the ninth einzel lens and the tenth einzel lens constitute a fourth unit of the third component.
Preferably, the glue marking lens is used as a component of the double telecentric zoom lens to perform cross-scale precision measurement.
Preferably, the front and rear focal surfaces of the zoom lens remain fixed.
The invention discloses the following technical effects:
the invention fills the gap of the optical information processing field and the precision measurement field for the requirement of a special zoom lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a first schematic view of a zoom lens according to the present invention;
FIG. 2 is a second schematic view of a zoom lens according to the present invention;
FIG. 3 is a third schematic view of a zoom lens according to the present invention;
FIG. 4 is a schematic diagram illustrating the relationship between the sizes of the zoom lens according to the present invention;
wherein, 1 is a first single lens, 2 is a second single lens, 3 is a third single lens, 4 is a fourth single lens, 5 is a fifth single lens, 6 is a sixth single lens, 7 is a seventh single lens, 8 is an eighth single lens, 9 is a ninth single lens, and 10 is a tenth single lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-4, the present invention provides a zoom lens with a fixed focal plane, which is characterized in that the zoom lens is composed of a first component, a second component and a third component which are coaxially arranged in sequence, wherein the first component is composed of a first single lens 1, a second single lens 2, a third single lens 3 and a fourth single lens 4 which are coaxially arranged in sequence, the second component is composed of a fifth single lens 5 and a sixth single lens 6 which are coaxially arranged in sequence, and the third component is composed of a seventh single lens 7, an eighth single lens 8, a ninth single lens 9 and a tenth single lens 10 which are coaxially arranged in sequence;
the sum of the optical powers of the first component, the second component and the third component is 0.
Further preferably, the first component is at a distance d from the second component 1 ；
The distance from the second component to the third component is d 2 ；
φ i (i ═ 1,2,3) is the optical power of the ith component;
the first component and the second component form an equivalent Gaussian system of the zoom lens, and the optical focal length of the first system is as follows:
φ 12 ＝φ 1 +φ 2 -φ 1 φ 2 τ 12 τ 12 ＝d 1 。
further preferably, the equivalent gaussian system and the second component constitute a zoom lens;
the focal power of the zoom lens is as follows:
φ＝φ 123 ＝φ 12 +φ 3 -φ 12 φ 3 τ 123 τ 123 ＝d 2 -d′ 12
Figure BDA0003626654270000051
further preferably, the distance between the focal planes of the zoom lens remains constant during zooming, wherein the distance is expressed as:
D＝-S F +d 1 +d 2 +S′ F
wherein D represents the distance between focal planes, S F Is the distance, S ', from the first component to the front focal plane' F Is the distance from the last component to the back focal plane.
Further preferably, d 1 The expression of (a) is:
Figure BDA0003626654270000052
wherein the content of the first and second substances,
Figure BDA0003626654270000053
further preferably, d 2 The expression of (a) is:
(φ 1 +φ 2 )(φ 1 +φ 2 -φ 1 φ 2 d 1 )d 2 +(φ 1 2 d 1 -φ)＝0。
further preferably, the first single lens 1 and the second single lens 2 constitute a first unit of the first component;
the third and fourth einzel lenses 3 and 4 constitute a second unit of the first component.
Further preferably, the seventh single lens 7 and the eighth single lens 8 constitute a third unit of a third component;
the ninth einzel lens 9 and the tenth einzel lens 10 constitute a fourth unit of the third component.
Further preferably, the glue marking lens is used as a component of the double telecentric zoom lens to perform cross-scale precision measurement.
Further preferably, the front focal plane and the rear focal plane of the zoom lens are kept fixed.
The zoom system with the fixed focal plane can keep the accurate control of the focal plane in the zooming process, so that space light can be modulated at the focal plane or the zoom system can be used as a component of a double telecentric zoom lens to carry out cross-scale accurate measurement.
The design of the zoom lens is different from the traditional zoom lens design, the traditional zoom lens design is designed based on the principle that the conjugate distance is not changed in the zooming process, and a plurality of mature design theories such as a differential method, a Gaussian bracket method, a pure algebraic method and the like are developed in recent years. The structure of the system is as follows, wherein d 1 And d 2 Respectively the distance from the first component to the second component, phi, from the second component to the third component i (i ═ 1,2,3) is the power of the ith component, φ is the equivalent power of the entire system, P represents the position of the principal planes of the equivalent Gaussian system, D is the distance between the focal planes of the optical system, S is the power of the ith component F Is the distance, S ', from the first component of the system to the front focal plane' F The distance from the last component of the system to the back focal plane. First, the first two components of the optical system are combined into a group with focal power phi 12 The equivalent gaussian system of (3) can obtain:
φ 12 ＝φ 1 +φ 2 -φ 1 φ 2 τ 12 τ 12 ＝d 1
Figure BDA0003626654270000071
wherein d is 12 Distance of the first component from the object main surface of the equivalent system of the first and second components, d 12 ' is the distance of the second component from the image side main face of the equivalent system of the first and second components, and then the combined system and the third component of the system are equivalent to an optical power of phi 123 The system of (2):
φ＝φ 123 ＝φ 12 +φ 3 -φ 12 φ 3 τ 123 τ 123 ＝d 2 -d′ 12
Figure BDA0003626654270000072
wherein d is 123 The distance from the object main surface of the first and second component equivalent systems to the object main surface of the first, second and third component equivalent systems, d 123 ' is the distance from the image side main face of the first and second component equivalent systems to the image side main face of the first, second and third component equivalent systems. The constraint condition of the optical system zooming is D ═ S F +d 1 +d 2 +S′ F D can be obtained by solving after determining the focal power and the distance D of each component in the system and keeping the focal power unchanged in the zooming process 1 And d 2 The value of (c). The Petzval field curvature of the system is used as an additional limiting condition, the field curvature of the system is completely corrected in the paraxial design stage, and phi can be obtained 1 +φ 2 +φ 3 0. Then under this condition the zoom equation has a simpler form:
Figure BDA0003626654270000073
wherein the coefficients are:
Figure BDA0003626654270000081
find d 1 After the value of (d), d can be calculated by the following relation 2 The value of (c).
(φ 1 +φ 2 )(φ 1 +φ 2 -φ 1 φ 2 d 1 )d 2 +(φ 1 2 d 1 -φ)＝0
To obtain d 1 And d 2 After the expression is carried out, the motion trail of each component can be obtained by solving the equation of the system in the whole zooming range through a Matlab program, so that the system is determinedThe design scheme of the near shaft of the system. And taking the optimized paraxial design scheme as a starting point of subsequent optimization. The optimization of an actual system is completed in optical design software, the default optimization condition of the system is the optimization of an object image plane, so the design needs to trace characteristic light rays to restrain the system, and the system is characterized in that the system is seen from the angle of geometrical optics. The paraxial zooming track is arranged in a multiple structure, enough discrete positions are selected to determine that the track does not deviate from a preset track in the optimization process, the correction of aberration is completed by optimization under the multiple structure, and a final design result can be obtained.
According to the zoom lens system provided by the invention, the first double cemented lens is formed by cementing the first single lens and the second single lens which are made of different materials and have the same curvature radius of the cemented surface, one side of the first single lens close to the object plane is a convex surface, and the side facing the cemented surface is a convex surface; one side of the second single lens, which is close to the third single lens, is a convex surface, and the side facing the gluing is a concave surface.
The second double cemented lens provided by the invention is formed by cementing a third single lens and a fourth single lens which are made of different materials and have the same curvature radius of the cemented surface, wherein one side of the third single lens close to the second lens is a convex surface, and the side facing the cementing is a convex surface; one side of the fourth single lens, which is close to the fifth single lens, is a convex surface, and the side facing the gluing is a concave surface.
The third double-cemented lens provided by the invention is formed by cementing a fifth single lens and a sixth single lens which are made of different materials and have the same curvature radius of the cemented surface, wherein one side of the fifth single lens, which is close to the fourth lens, is a concave surface, and the side facing the cemented surface is a convex surface; one side of the sixth single lens, which is close to the seventh single lens, is a concave surface, and the side facing the gluing is a concave surface.
The fourth double-cemented lens provided by the invention is formed by cementing a seventh single lens and an eighth single lens which are made of different materials and have the same curvature radius of the cemented surface, wherein one side of the seventh single lens, which is close to the sixth lens, is a concave surface, and the side facing the cemented surface is a convex surface; one side of the eighth single lens, which is close to the ninth single lens, is a concave surface, and the side facing the gluing is a concave surface.
The fifth double-cemented lens provided by the invention is formed by cementing a ninth single lens and a tenth single lens which are made of different materials and have the same curvature radius of the cemented surface, wherein one side of the ninth single lens, which is close to the eighth lens, is a convex surface, and the side facing the cemented surface is a concave surface; one side of the eighth single lens, which is close to the image plane, is a convex surface, and the side facing the gluing is a convex surface.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A zoom lens with a fixed focal plane is characterized in that the zoom lens consists of a first component, a second component and a third component which are coaxially arranged in sequence, wherein the first component consists of a first single lens (1), a second single lens (2), a third single lens (3) and a fourth single lens (4) which are coaxially arranged in sequence, the second component consists of a fifth single lens (5) and a sixth single lens (6) which are coaxially arranged in sequence, and the third component consists of a seventh single lens (7), an eighth single lens (8), a ninth single lens (9) and a tenth single lens (10) which are coaxially arranged in sequence;
the sum of the optical powers of the first component, the second component and the third component is 0.
2. A fixed focal plane zoom lens as claimed in claim 1, wherein:
the distance from the first component to the second component is d 1 ；
The distance from the second component to the third component is d 2 ；
φ i (i ═ 1,2,3) is the optical power of the ith component;
the first component and the second component form an equivalent Gaussian system of the zoom lens, and the optical focal length of the first system is as follows:
φ 12 ＝φ 1 +φ 2 -φ 1 φ 2 τ 12 τ 12 ＝d 1 。
3. a fixed focal plane zoom lens according to claim 2, wherein:
the equivalent Gaussian system and the second component constitute the zoom lens;
the focal power of the zoom lens is as follows:
φ＝φ 123 ＝φ 12 +φ 3 -φ 12 φ 3 τ 123 τ 123 ＝d 2 -d′ 12
Figure FDA0003626654260000011
4. a fixed focal plane zoom lens according to claim 3, wherein:
the distance between the focal planes of the zoom lens is kept constant in the zooming process, wherein the distance is expressed as:
D＝-S F +d 1 +d 2 +S′ F
wherein D represents the distance between focal planes, S F Is the distance of the first component from the front focal plane，S′ F Is the distance from the last component to the back focal plane.
5. The fixed-focal-plane zoom lens according to claim 4, wherein:
d is 1 The expression of (a) is:
Figure FDA0003626654260000021
wherein the content of the first and second substances,
Figure FDA0003626654260000022
6. the fixed focal plane zoom lens of claim 5, wherein:
d is 2 The expression of (a) is:
Figure FDA0003626654260000023
7. the fixed focal plane zoom lens of claim 6, wherein:
said first singlet lens (1) and said second singlet lens (2) constitute a first unit of said first component;
the third single lens (3) and the fourth single lens (4) constitute a second unit of the first component.
8. The fixed focal plane zoom lens of claim 7, wherein:
said seventh singlet lens (7) and said eighth singlet lens (8) constitute a third unit of said third component;
the ninth einzel lens (9) and the tenth einzel lens (10) constitute a fourth unit of the third component.
9. The fixed focal plane zoom lens of claim 8, wherein:
the glue marking lens is used as a component of the double telecentric zoom lens for performing cross-scale precision measurement.
10. The fixed focal plane zoom lens of claim 9, wherein:
the front focal plane and the rear focal plane of the zoom lens are kept fixed.
CN202210478311.3A 2022-05-05 2022-05-05 Zoom lens with fixed focal plane Pending CN114859533A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011048320A (en) * 2009-07-29 2011-03-10 Fujifilm Corp Zoom lens
CN110376720A (en) * 2019-08-19 2019-10-25 浙江舜宇光学有限公司 Optical imaging system
CN114063273A (en) * 2021-12-22 2022-02-18 东莞市宇瞳光学科技股份有限公司 Zoom lens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011048320A (en) * 2009-07-29 2011-03-10 Fujifilm Corp Zoom lens
CN110376720A (en) * 2019-08-19 2019-10-25 浙江舜宇光学有限公司 Optical imaging system
CN114063273A (en) * 2021-12-22 2022-02-18 东莞市宇瞳光学科技股份有限公司 Zoom lens

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ZICHAO FAN ET AL.: "Automatically retrieving an initial design of a double-sided telecentric zoom lens based on a particle swarm optimization", 《APPLIED OPTICS》, vol. 58, no. 27, 20 September 2019 (2019-09-20), pages 7379 - 7386 *
ZICHAO FAN ET AL.: "Globally optimal first-order design of zoom systems with fixed foci as well as high zoom ratio", 《OPTICS EXPRESS》, vol. 27, no. 26, 23 December 2019 (2019-12-23), pages 38180 - 38190 *

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