CN113504640B - Low-distortion binocular optical system - Google Patents
Low-distortion binocular optical system Download PDFInfo
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- CN113504640B CN113504640B CN202110611282.9A CN202110611282A CN113504640B CN 113504640 B CN113504640 B CN 113504640B CN 202110611282 A CN202110611282 A CN 202110611282A CN 113504640 B CN113504640 B CN 113504640B
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- lens
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- cemented
- eyepiece
- objective lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/06—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors having a focussing action, e.g. parabolic mirror
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
-
- 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
Abstract
The invention provides a low-distortion binocular optical system, which comprises an objective cemented lens, an objective second lens, an objective focusing lens, a half-pentaprism, a roof prism, an eyepiece first cemented lens, an eyepiece second cemented lens and an eyepiece fifth lens, and is characterized in that: have set gradually objective cemented lens along the optical axis direction, objective second lens, objective focusing lens, half pentaprism, roof prism, the first cemented lens of eyepiece, eyepiece second cemented lens, eyepiece fifth lens, objective cemented lens are biconvex type lens, objective second lens is the convex lens of convex surface towards the object space, the design of aspheric surface is adopted to the first cemented lens right flank of eyepiece, eyepiece second cemented lens left side adopts the design of aspheric surface, can realize lower distortion and achromatism problem.
Description
Technical Field
The invention relates to the technical field of optical instrument manufacturing, in particular to a low-distortion binocular optical system.
Background
The telescope is an optical system which enables incident parallel light to be emitted in a parallel mode, an image space focal point of an objective lens is overlapped with an object space focal point of an eyepiece lens, the existing optical system is different in design concept, different technical paths are adopted for optical system design, the obtained optical system is also different, spherical aberration, coma aberration and chromatic aberration can be corrected through the optical design of a cemented lens, and the optical system is increasingly used in the optical design of the telescope.
Disclosure of Invention
The invention aims to provide a low-distortion binocular optical system, which meets the requirements that the exit pupil distance is 17mm, the view field reaches 7.85 degrees and lower distortion is achieved through reasonable optical structure design, and the chromatic aberration of the optical system is solved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a low distortion binocular optical system, includes objective cemented lens, objective second lens, objective focusing lens, half pentaprism, roof prism, the first cemented lens of eyepiece, eyepiece second cemented lens, eyepiece fifth lens, its characterized in that: have set gradually objective cemented lens, objective second lens, objective focusing lens, half pentaprism, roof prism, the first cemented lens of eyepiece, eyepiece second cemented lens, eyepiece fifth lens, objective cemented lens are biconvex type lens, and objective second lens is the convex lens of convex surface towards the object space, and the first cemented lens right flank of eyepiece adopts the aspheric surface design, and eyepiece second cemented lens left side adopts the aspheric surface design.
As a further improvement of the invention, the objective lens cemented lens and the objective lens second lens are combined into an objective lens front group, and the f number of the objective lens front group is 135.99 mm;
the objective lens is formed by combining the objective lens cemented lens, the objective lens second lens and the objective lens focusing lens, and the f number of the objective lens is 214.42 mm;
the first cemented lens of eyepiece, eyepiece second cemented lens make up into the eyepiece, and its f number is 27.3 mm.
As a further improvement of the invention, the total length of an optical system consisting of the objective cemented lens, the objective lens second lens, the objective lens focusing lens, the half pentaprism, the roof prism, the ocular first cemented lens, the ocular second cemented lens and the ocular fifth lens is 120.38 mm.
As a further improvement of the invention, the axial distance between the right side surface of the second lens of the objective lens and the left side surface of the focusing lens of the objective lens is 20.07mm, the axial distance between the right side surface of the focusing lens of the objective lens and the left side surface of the half-pentaprism is 21.5mm, and the axial distance between the right side surface of the roof prism and the left side surface of the ocular cemented first lens is 14.71 mm.
As a further improvement of the invention, the curvature radius of the left side surface of the objective cemented lens is 114.29mm, the curvature radius of the right side surface is-517.6 mm, the curvature radius of the cemented surface is-54.45 mm, the center thickness is 8.3mm, and the contour diameter is 33.5 mm;
the curvature radius of the left side surface of the second lens of the objective lens is 63.68mm, the right side surface of the second lens of the objective lens is a near plane, the center thickness of the second lens of the objective lens is 4.3mm, and the contour diameter of the second lens of the objective lens is 33.5 mm;
the curvature radius of the left side surface of the objective lens focusing lens is 150.66mm, the curvature radius of the right side surface of the objective lens focusing lens is 58.48mm, the center thickness of the objective lens focusing lens is 2.0mm, and the contour diameter of the objective lens focusing lens is 22.0 mm;
the curvature radius of the left side surface of the first cemented lens of the eyepiece is-25.23 mm, the curvature radius of the cemented surface is 19.05mm, the center thickness is 10.9mm, and the contour diameter is 23.5 mm;
the curvature radius of the right side surface of the second cemented lens of the eyepiece is minus 44.57mm, the curvature radius of the cemented surface is minus 19.05mm, the center thickness is 10.2mm, and the contour diameter is 25.5 mm;
the curvature radius of the left side surface of the fifth lens of the eyepiece is 24.5mm, the right side surface of the fifth lens of the eyepiece is a near plane, the center thickness of the fifth lens is 5.4, and the outline diameter of the fifth lens of the eyepiece is 27 mm;
the length of the optical axis of the half pentaprism is 34.75mm, and the length of the optical axis of the roof prism is 54.74 mm.
As a further improvement of the invention, the distance between the half pentaprism and the upper roof prism is 1 mm.
Has the advantages that:
the scheme utilizes the objective lens cemented lens, the first cemented lens of the ocular lens and the second cemented lens of the ocular lens to correct spherical aberration, coma and chromatic aberration, the side surfaces of the first cemented lens of the ocular lens and the second cemented lens of the ocular lens which are adjacent adopt aspheric surface design structures, the problems of distortion and chromatic aberration are solved, a telescope optical system with low distortion and no chromatic aberration is realized, the curvature radius of the cemented surface of the first cemented lens of the ocular lens and the cemented surface of the second cemented lens of the ocular lens are in a symmetrical structure, good light path transmittance is formed, the image surface is clearer and more stable, the field flattening effect is good, the maximum field of view is 7.85 degrees,
the objective lens focusing lens moves to the right by 10mm, the corresponding closest distance is 2.47m, the objective lens focusing lens moves to the right by 12mm, the corresponding closest distance is 2.09 m, the objective lens focusing lens moves to the left by 0.79mm, and the corresponding diopter is-5 diopters.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph of field curvature and distortion for the present invention;
FIG. 3 is an axial aberration diagram of the present invention;
FIG. 4 is a dot diagram of the present invention;
FIG. 5 is a vertical axis color difference chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a low distortion binocular optical system, includes objective cemented lens 1, objective second lens 2, objective focusing lens 3, half pentaprism 4, roof prism 5, the first cemented lens 6 of eyepiece, eyepiece second cemented lens 7, eyepiece fifth lens 8, its characterized in that: have set gradually objective cemented lens 1 along the optical axis direction, objective second lens 2, objective focusing lens 3, half pentaprism 4, roof prism 5, the first cemented lens 6 of eyepiece, eyepiece second cemented lens 7, eyepiece fifth lens 8, objective cemented lens 1 is biconvex type lens, objective second lens 2 is the convex lens of convex surface towards the object space, 6 right sides of the first cemented lens of eyepiece adopt the aspheric surface design, 7 left sides of eyepiece second cemented lens adopt the aspheric surface design, utilize, the problem of distortion and colour difference has been solved in the design of the bispherical surface of eyepiece, the flat field effect is good.
As a further preferable embodiment of the present invention, the objective cemented lens 1 and the objective second lens 2 are combined into an objective front group, and the f-number thereof is 135.99 mm;
the objective lens is formed by combining the objective lens cemented lens 1, the objective lens second lens 2 and the objective lens focusing lens 3, and the f number of the objective lens is 214.42 mm;
the first cemented lens 6 of the eyepiece and the second cemented lens 7 of the eyepiece are combined into the eyepiece, and the f number of the eyepiece is 27.3 mm.
As a further preferable scheme of the invention, the total length of an optical system consisting of the objective cemented lens 1, the objective lens second lens 2, the objective lens focusing lens 3, the half-pentaprism 4, the roof prism 5, the ocular first cemented lens 6, the ocular second cemented lens 7 and the ocular fifth lens 8 is 120.38mm, the problem of longer optical system of the telescope is solved, and the design can meet smaller assembly.
As a further improvement of the invention, the axial distance between the right side surface of the objective lens second lens 2 and the left side surface of the objective lens focusing lens 3 is 20.07mm, the axial distance between the right side surface of the objective lens focusing lens 3 and the left side surface of the half pentaprism 4 is 21.5mm, and the axial distance between the right side surface of the roof prism 5 and the left side surface of the ocular cemented first lens 6 is 14.71 mm.
As a further improvement of the invention, the curvature radius of the left side surface of the objective cemented lens 1 is 114.29mm, the curvature radius of the right side surface is-517.6 mm, the curvature radius of the cemented surface is-54.45 mm, the center thickness is 8.3mm, and the contour diameter is 33.5 mm;
the curvature radius of the left side surface of the second lens 2 of the objective lens is 63.68mm, the right side surface is a near plane, the center thickness is 4.3mm, and the contour diameter is 33.5 mm;
the curvature radius of the left side surface of the objective lens focusing lens 3 is 150.66mm, the curvature radius of the right side surface is 58.48mm, the center thickness is 2.0mm, and the contour diameter is 22.0 mm;
the curvature radius of the left side surface of the eyepiece first cemented lens 6 is-25.23 mm, the curvature radius of the cemented surface is 19.05mm, the center thickness is 10.9mm, and the contour diameter is 23.5 mm;
the curvature radius of the right side surface of the eyepiece second cemented lens 7 is minus 44.57mm, the curvature radius of the cemented surface is minus 19.05mm, the center thickness is 10.2mm, and the contour diameter is 25.5 mm;
the curvature radius of the left side surface of the eyepiece fifth lens 8 is 24.5mm, the right side surface is a near plane, the center thickness is 5.4, and the contour diameter is 27 mm;
the length of the optical axis of the half pentaprism 4 is 34.75mm, and the length of the optical axis of the roof prism 5 is 54.74 mm.
As a further preferable aspect of the present invention, a distance between the half pentaprism and the upper roof prism is 1 mm.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. The utility model provides a low distortion binocular optical system, includes objective cemented lens, objective second lens, objective focusing lens, half pentaprism, roof prism, the first cemented lens of eyepiece, eyepiece second cemented lens, eyepiece fifth lens, its characterized in that: the objective lens cemented lens, the objective lens second lens, the objective lens focusing lens, the half-pentaprism, the roof prism, the eyepiece lens first cemented lens, the eyepiece lens second cemented lens and the eyepiece lens fifth lens are sequentially arranged along the optical axis direction, the objective lens cemented lens is a biconvex lens, the objective lens second lens is a convex lens with a convex surface facing the object space, the right side surface of the eyepiece lens first cemented lens adopts an aspheric surface design, and the left side of the eyepiece lens second cemented lens adopts an aspheric surface design;
the objective lens cemented lens and the objective lens second lens are combined into an objective lens front group, and the F number of the objective lens front group is 135.99 mm;
the objective lens is formed by combining the objective lens cemented lens, the objective lens second lens and the objective lens focusing lens, and the F number of the objective lens is 214.42 mm;
the first cemented lens of eyepiece, eyepiece second cemented lens make up into the eyepiece, and its F number is 27.3 mm.
2. The low distortion binocular optical system of claim 1, wherein: the total length of an optical system consisting of the objective lens cemented lens, the objective lens second lens, the objective lens focusing lens, the half-pentaprism, the roof prism, the ocular lens first cemented lens, the ocular lens second cemented lens and the ocular lens fifth lens is 120.38 mm.
3. The low distortion binocular optical system of claim 1, wherein: the distance between the right side surface of the second objective lens and the left side surface of the objective lens focusing lens is 20.07mm, the distance between the right side surface of the objective lens focusing lens and the left side surface of the half-pentaprism is 21.5mm, and the distance between the right side surface of the roof prism and the axis of the left side surface of the first eyepiece cemented objective lens is 14.71 mm.
4. The low distortion binocular optical system of claim 1, wherein: the curvature radius of the left side surface of the objective cemented lens is 114.29mm, the curvature radius of the right side surface of the objective cemented lens is-517.6 mm, the curvature radius of the cemented surface is-54.45 mm, the center thickness is 8.3mm, and the profile diameter is 33.5 mm;
the curvature radius of the left side surface of the second lens of the objective lens is 63.68mm, the right side surface of the second lens of the objective lens is a near plane, the center thickness of the second lens of the objective lens is 4.3mm, and the contour diameter of the second lens of the objective lens is 33.5 mm;
the curvature radius of the left side surface of the objective lens focusing lens is 150.66mm, the curvature radius of the right side surface of the objective lens focusing lens is 58.48mm, the center thickness of the objective lens focusing lens is 2.0mm, and the contour diameter of the objective lens focusing lens is 22.0 mm;
the curvature radius of the left side surface of the first cemented lens of the eyepiece is-25.23 mm, the curvature radius of the cemented surface is 19.05mm, the center thickness is 10.9mm, and the contour diameter is 23.5 mm;
the curvature radius of the right side surface of the second cemented lens of the eyepiece is minus 44.57mm, the curvature radius of the cemented surface is minus 19.05mm, the center thickness is 10.2mm, and the contour diameter is 25.5 mm;
the curvature radius of the left side surface of the fifth lens of the eyepiece is 24.5mm, the right side surface of the fifth lens of the eyepiece is a near plane, the center thickness is 5.4, and the contour diameter is 27 mm;
the length of the optical axis of the half pentaprism is 34.75mm, and the length of the optical axis of the roof prism is 54.74 mm.
5. The low distortion binocular optical system of claim 1, wherein: the distance between the half pentaprism and the upper roof prism is 1 mm.
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| CN202110611282.9A CN113504640B (en) | 2021-06-02 | 2021-06-02 | Low-distortion binocular optical system |
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| CN202110611282.9A CN113504640B (en) | 2021-06-02 | 2021-06-02 | Low-distortion binocular optical system |
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| CN113504640A CN113504640A (en) | 2021-10-15 |
| CN113504640B true CN113504640B (en) | 2022-08-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116560065B (en) * | 2023-07-10 | 2023-09-08 | 云南汉瑞光学仪器有限公司 | Large-view-field telescope optical system |
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