CN216848333U

CN216848333U - Non-curved surface telescopic optical system

Info

Publication number: CN216848333U
Application number: CN202220443567.6U
Authority: CN
Inventors: 方春丽; 杨可
Original assignee: Kunming Shunho Optics Co ltd
Current assignee: Kunming Shunho Optics Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-06-28
Anticipated expiration: 2032-03-03

Abstract

The utility model belongs to the technical field of optics, concretely relates to non-curved surface telescopic optical system, including objective set and eyepiece set, be provided with focusing lens and prism between objective set and the eyepiece set, focusing lens is close to the objective set setting, the prism is close to the eyepiece set setting; the prism comprises a half pentaprism and a roof prism, and the roof prism is positioned above the half pentaprism. The utility model discloses the spherical aberration that spherical lens brought in collimation and focus system has been revised.

Description

Non-curved surface telescopic optical system

Technical Field

The utility model belongs to the technical field of optics, concretely relates to non-curved surface telescope optical system.

Background

The improvement of the technical and optical performance of the existing spherical telescope has reached a bottleneck, and people need to pursue higher technical performance to increase various performances of a telescopic system, so that a user has more comfortable use feeling, and the telescope has higher restoration degree to an object image. Although there are many different techniques available on the market to correct the aberrations produced by spherical lenses, these techniques suffer from deficiencies in both imaging performance and flexibility.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the present invention is to provide a non-curved telescopic optical system for correcting the spherical aberration of a spherical lens in a collimating and focusing system.

In order to solve the technical problem, the technical scheme of the utility model is that:

a non-curved telescopic optical system comprises an objective lens group and an eyepiece lens group, wherein a focusing lens and a prism are arranged between the objective lens group and the eyepiece lens group, the focusing lens is arranged close to the objective lens group, and the prism is arranged close to the eyepiece lens group;

the prism comprises a half pentaprism and a roof prism, and the roof prism is positioned above the half pentaprism.

The present invention provides a non-curved telescopic optical system, preferably, the objective lens group includes a first objective lens, a second objective lens and a third objective lens.

The utility model provides an among the non-curved surface telescope optical system, preferably again, eyepiece group includes first eyepiece lens, second eyepiece lens, third eyepiece lens, fourth eyepiece lens and fifth eyepiece lens.

The utility model provides an among the non-curved surface telescope optical system, more preferably, focusing lens toward the third objective lens direction removes 1.05mm and corresponds and adjust-5 diopters, toward half pentaprism direction removes 10mm and corresponds and observe 2.13m closely.

In the utility model provides an among the non-curved surface telescope optical system, further preferentially again, eyepiece group removes 0.66mm and corresponds adjustment 3 diopters.

In the non-curved telescopic optical system provided by the present invention, it is further preferable that the first objective lens and/or the second objective lens is made of H-FK61 optical glass.

The utility model provides an among the non-curved surface telescope optical system, further preferably again, fifth eyepiece lens is aspheric lens.

In the non-curved telescopic optical system provided by the present invention, most preferably, the fifth eyepiece lens is made of a D-ZK2 optical glass material.

By adopting the technical scheme, the aspheric lens is used in the telephoto system, so that the performance of the system is improved, such as the image quality is improved, the stray light effect is reduced, the performance of the system is improved, and the cost of the system is reduced.

The utility model provides high optical performance has reduced the aberration of marginal visual field, makes the formation of image clearer. The aspheric lens is used to replace the spherical lens, and the most significant advantage is that the spherical aberration of the spherical lens in the collimation and focusing system can be corrected. Aspheric lenses simplify the elements that optical engineers are concerned with in order to improve optical quality, while improving the stability of the system.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: the three-lens-array-based focusing lens comprises a 1-objective lens group, a 2-ocular lens group, a 3-focusing lens, a 4-prism, a 5-half pentaprism, a 6-roof prism, a 7-first objective lens, a 8-second objective lens, a 9-third objective lens, a 10-first ocular lens, a 11-second ocular lens, a 12-third ocular lens, a 13-fourth ocular lens and a 14-fifth ocular lens.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

A non-curved telescopic optical system, as shown in FIG. 1, includes an objective lens group 1 and an eyepiece lens group 2. The objective lens group 1 comprises a first objective lens 7, a second objective lens 8 and a third objective lens 9, wherein the first objective lens 7 and the second objective lens 8 are made of H-FK61 optical glass, so that chromatic aberration of the system can be eliminated, and the color reproducibility is high. The eyepiece group 2 includes a first eyepiece lens 10, a second eyepiece lens 11, a third eyepiece lens 12, a fourth eyepiece lens 13, and a fifth eyepiece lens 14. The first eyepiece lens 10 is made of a high refractive material H-ZF 62. The fifth eyepiece lens 14 is an aspheric lens and is made of a D-ZK2 optical glass material, so that various aberrations are corrected, the image quality value around the MTF is improved, and the field curvature, distortion, coma aberration, chromatic aberration, astigmatism and the like are optimized and improved.

A focusing lens 3 and a prism 4 are arranged between the objective lens group 1 and the eyepiece lens group 2, the focusing lens 3 is arranged close to the third objective lens 9, and the prism 4 is arranged close to the first eyepiece lens 10.

The prism 4 includes a half pentaprism 5 and a roof prism 6, and the roof prism 6 is located above the half pentaprism 5.

The focusing lens 3 moves 1.05mm in the direction of the third objective lens 9 to adjust-5 diopters correspondingly, and moves 10mm in the direction of the half pentaprism 5 to observe a short distance of 2.13m correspondingly. The movement of the ocular group is +/-0.66 mm, and the corresponding adjustment is +/-3 diopters.

The utility model discloses a full field of vision is 6.5, and the magnification is 10 times, and exit pupil distance 16.3mm, exit pupil diameter phi 4.218mm, resolution ratio 3.6 ".

The aspheric lens is added in the eyepiece group 2, so that the form of the eyepiece group improves the optical effect, improves the MTF transfer function value, ensures the balance of the MTF of the whole view field, solves the problem of rapid attenuation of the image quality of the view field, improves the resolution of the marginal view field at the same time, and optimizes the value of the marginal view field to 0.3 at 30 LP/mm.

In order to obtain a large visual field, astigmatism, field curvature, distortion and magnification chromatic aberration must be corrected besides eliminating position chromatic aberration, spherical aberration and coma aberration, and the total visual field of the eyepiece group is 59.2 degrees, the field curvature is 0.7196mm, the distortion is 2.13 percent, and compared with an eyepiece with the same visual field and the same structure, the field curvature and the distortion are reduced by 5 times. The vertical axis chromatic aberration is 13.367, the axial chromatic aberration is-0.3654, and the color reduction degree is higher; the spherical aberration generated by the spherical lens is eliminated.

Astigmatism, which has the greatest effect on the vision of the human eye, directly affects the visual acuity. The eyepiece group 2 of the utility model optimizes astigmatism, so that the astigmatism disappears to be indistinguishable to human eyes. The most significant advantage is that the spherical aberration of the spherical lens in the collimating and focusing system can be corrected. By adjusting the surface constant and the aspheric coefficient, the aspheric lens can eliminate spherical aberration to the maximum extent. Aspheric lenses (where light converges to the same point, providing optical quality) substantially eliminate spherical aberration produced by spherical lenses (where light converges to different points, causing image blur). The position chromatic aberration and the magnification chromatic aberration are also optimized and corrected.

The curvature radius of the aspheric lens is changed along with the central axis, so that the optical quality is improved, optical elements are reduced, and the design cost is reduced.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. A non-curved telescopic optical system comprises an objective lens group and an eyepiece lens group, and is characterized in that a focusing lens and a prism are arranged between the objective lens group and the eyepiece lens group, the focusing lens is arranged close to the objective lens group, and the prism is arranged close to the eyepiece lens group;

2. The non-curved telescopic optical system according to claim 1, wherein said objective lens group includes a first objective lens, a second objective lens and a third objective lens.

3. The non-curved telescopic optical system according to claim 2, wherein said eyepiece group includes a first eyepiece lens, a second eyepiece lens, a third eyepiece lens, a fourth eyepiece lens, and a fifth eyepiece lens.

4. The non-curved telescopic optical system of claim 3, wherein the focusing lens moves 1.05mm toward the third objective lens for-5 diopters, and moves 10mm toward the semi-pentaprism for a 2.13m close range.

5. The non-curved telescopic optical system according to claim 4, wherein the eyepiece group moves by ± 0.66mm for ± 3 diopters of corresponding adjustment.

6. The non-curved telescopic optical system according to claim 5, wherein said first objective lens or/and said second objective lens is made of H-FK61 optical glass.

7. The non-curved telescopic optical system according to claim 6, wherein said fifth eyepiece lens is an aspherical lens.

8. The non-curved telescopic optical system according to claim 7, wherein said fifth eyepiece lens is made of a D-ZK2 optical glass material.