Zoom binoculars
The zoom binocular design addresses low resolution and user experience issues by employing a specific lens and prism arrangement for continuous magnification adjustment and internal focusing, achieving high resolution and compact size with reduced chromatic aberration.
Patent Information
- Application Number
- DE202024104919
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2024-07-30
- Filing Date
- 2024-08-29
- Publication Date
- 2024-12-19
- Estimated Expiration
- 2034-08-31
AI Technical Summary
Existing zoom binoculars suffer from low resolution and poor user experience.
A zoom binocular design featuring a specific arrangement of lens and prism groups, including cemented lenses and a movable eyepiece zoom group and compensation group, with focal length relationships that allow continuous magnification adjustment, and internal focusing through a right-angle prism.
Enables high resolution and large field of view with adjustable magnification, stable imaging at varying distances, and compact size, while reducing chromatic aberration and weight.
Smart Images
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Abstract
Description
Technical area
[0001] The present utility model relates to the technical field of optical lenses and in particular to zoom binoculars. Background technology
[0002] Zoom binoculars are optical instruments that can change the field of view by adjusting the magnification. At lower magnification, the field of view is wider and the objects seen are smaller; at higher magnification, the field of view is narrower, but the objects seen are larger and the details are clearer. Zoom binoculars have a wide range of applications and can be used for astronomical observations, outdoor adventures, military reconnaissance, birdwatching, and more.
[0003] However, the existing zoom binoculars have the disadvantages of low resolution and poor user experience. Content of the utility model
[0004] Therefore, the technical problem to be solved by the present utility model is to overcome the shortcomings of low resolution and poor user experience of existing binoculars and thereby provide a zoom binocular.
[0005] To solve the aforementioned technical problems, the technical solution of the present utility model is as follows: a zoom binocular comprising an objective group, a prism group and an eyepiece group arranged sequentially along the direction of the optical axis; wherein the lens group comprises a first lens of a positive optical focal length lens, a second lens of a negative optical focal length lens, a third lens of a positive optical focal length lens, and a fourth lens of a negative optical focal length lens, which are arranged sequentially along the optical axis direction from the object side to the observation side; wherein this eyepiece group comprises a first lens of an eyepiece with a negative optical focal length, a second lens of an eyepiece with a positive optical focal length, a third lens of an eyepiece with a negative optical focal length, a fourth lens of an eyepiece with a positive optical focal length, a fifth lens of an eyepiece with a positive optical focal length, a sixth lens of an eyepiece with a negative optical focal length, a seventh lens of the eyepiece with a positive optical focal length, and an eighth lens of the eyepiece with a negative optical focal length, arranged successively along the direction of the optical axis from the object side to the observation side; wherein the first lens of the eyepiece and the second lens of the eyepiece form an eyepiece compensation group; the third lens of the eyepiece, the fourth lens of the eyepiece, the fifth lens of the eyepiece, and the sixth lens of the eyepiece form an eyepiece zoom group; the seventh lens of the eyepiece and the eighth lens of the eyepiece form an eyepiece fixed group; wherein the focal lengths of all lens groups satisfy the following condition expression: −1.4 <F31 / F32<−0,9; 1.2 <F33 / F32<1,7; where F 31 the combined focal length of the eyepiece compensation group, F 32 the combined focal length of the eyepiece zoom group and F 33 the combined focal length of the fixed eyepiece group is; The magnification rate of the zoom binoculars is F1 / F3, 20 <F1 / F3<60; wobei F1 die kombinierte Brennweite der Objektivgruppe und F3 die kombinierte Brennweite der Okulargruppe ist; wobei die Okularzoomgruppe und die Okularkompensationsgruppe entlang der Richtung der optischen Achse näher zueinander oder weiter voneinander entfernt bewegt werden können, um eine kontinuierliche Änderung der Vergrößerungsrate in dem Bereich zwischen 60 und 20 zu erreichen.
[0006] Furthermore, the prism group comprises a first right-angle prism, a second right-angle prism, and a half-pentaprism arranged sequentially along the optical axis direction from the object side to the observation side; wherein the half-pentaprism is configured to change the optical axis direction.
[0007] Furthermore, at least one of the first right-angle prism and the second right-angle prism is provided to be movable along the optical axis direction; wherein focusing is achieved by moving at least one of the first right-angle prism and the second right-angle prism.
[0008] Furthermore, the second lens of the objective and the third lens of the objective are cemented together at the sides where they meet; the first lens of the eyepiece and the second lens of the eyepiece are cemented together at the sides where they meet; the third lens of the eyepiece and the fourth lens of the eyepiece are cemented together at the sides where they meet; the fifth lens of the eyepiece and the sixth lens of the eyepiece are cemented together at the sides where they meet; and the seventh lens of the eyepiece and the eighth lens of the eyepiece are cemented together at the sides where they meet.
[0009] Furthermore, the eyepiece compensation group is moved in the opposite direction along the optical axis when the eyepiece zoom group is moved along the optical axis.
[0010] Furthermore, the eyepiece group is provided with a protective glass (30) on one side near the prism group.
[0011] Furthermore, the opening of the first lens of the objective is in the range of 70-90 mm.
[0012] Furthermore, the diameter of the exit pupil of the zoom binoculars is varied in a range of 1.5 mm to 4 mm when the magnification rate of the zoom binoculars varies between 60x and 20x.
[0013] Furthermore, the distance between the exit pupil of the zoom binoculars is 16-20 mm.
[0014] Furthermore, the total weight of the zoom binoculars does not exceed 1500 g and the total optical length does not exceed 400 mm.
[0015] The technical solution of the present utility model has the following advantages: this zoom binocular can achieve continuous adjustment of the magnification rate by moving the eyepiece zoom group and the eyepiece compensation group closer together or further apart along the optical axis, thus meeting the requirements of different observation objects; furthermore, provided this function is implemented, high resolution in the center of the field of view and a wide field of view are achieved, enabling clear imaging. It also offers the advantages of small size, light weight, and low price.
[0016] In addition, these zoom binoculars achieve internal focusing through a right-angle prism, which can ensure stable imaging when used at different object distances. Multiple groups of cemented lenses and low-dispersion glass significantly reduce chromatic aberration. Brief description of the drawings
[0017] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present utility model, the accompanying drawings are briefly presented below. These drawings must be used in describing the specific embodiments or prior art. It is obvious that the accompanying drawings in the following description represent some of the embodiments of the present utility model, and that other drawings can be obtained based on the accompanying drawings for general technical personnel in the field, provided they do not perform creative work.
[0018] Fig. Figure 1 is an optical structure diagram of a zoom binocular in an embodiment, the present utility model, where the magnification rate is 60x.
[0019] In the figures: 1. Objective group; L11. first lens of the objective; L12. second lens of the objective; L13. third lens of the objective; L14. fourth lens of the objective; 2. Prism group; L21. first right prism; L22. second right prism; L23. semi-pentaprism; 3. Eyepiece group; L30. protective glass; L31. first lens of the eyepiece; L32. second lens of the eyepiece; L33. third lens of the eyepiece; L34. fourth lens of the eyepiece; L35. fifth lens of the eyepiece; L36. sixth lens of the eyepiece; L37. seventh lens of the eyepiece; L38. eighth lens of the eyepiece. Description of preferred embodiments
[0020] The technical solutions of the present utility model are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the description of the embodiments represents only a portion of the embodiments of the present utility model and not all of them. Starting from the embodiments of the present utility model, all other embodiments that a person skilled in the art can produce without creative effort fall within the scope of protection of the present utility model.
[0021] In describing the embodiment of the present utility model, it is necessary to point out that any azimuth or positional relationship referred to in terms such as "central," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," and the like, is based on the drawing. These terms are intended to facilitate and simplify the description of the present utility model, rather than indicating or implying that the device or component in question must have a specific orientation, be designed, or be operated in a particular orientation. Therefore, they must not be interpreted as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used only for differentiation and should not be understood as indicating a relative meaning.
[0022] The embodiment of the present utility model provides a zoom binocular to achieve flexible changes in various magnifications, and, provided this function is implemented, enables a clear image. It also offers the advantages of small size, light weight, and low price.
[0023] As in Fig. As shown in Figure 1, a zoom binocular comprises an objective group 1, a prism group 2 and an eyepiece group 3, arranged sequentially along the direction of the optical axis from the object side to the observation side.
[0024] The lens group 1 comprises a first lens of a lens L11 with a positive optical focal length, a second lens of a lens L12 with a negative optical focal length, a third lens of a lens L13 with a positive optical focal length and a fourth lens of a lens L14 with a negative optical focal length, which are arranged sequentially along the direction of the optical axis from the object side to the observation side.
[0025] The prism group includes a first right-angle prism L21, a second right-angle prism L22, and a half-penta prism L23, arranged sequentially along the optical axis direction from the object side to the observation side. The half-penta prism L23 can change the direction of the optical axis, which not only facilitates observation but also contributes to shortening the overall length of the finished zoom binoculars.
[0026] This eyepiece group comprises a protective glass L30, a first lens of an eyepiece L31 with a negative optical focal length, a second lens of an eyepiece L32 with a positive optical focal length, a third lens of an eyepiece L33 with a negative optical focal length, a fourth lens of an eyepiece L34 with a positive optical focal length, a fifth lens of an eyepiece L35 with a positive optical focal length, a sixth lens of an eyepiece L36 with a negative optical focal length, a seventh lens of the eyepiece L37 with a positive optical focal length, and an eighth lens of the eyepiece L38 with a negative optical focal length, arranged successively along the direction of the optical axis from the object side to the observation side.Wherein the first lens of the eyepiece L31 and the second lens of the eyepiece L32 form an eyepiece compensation group 31; the third lens of the eyepiece L33, the fourth lens of the eyepiece L34, the fifth lens of the eyepiece L35 and the sixth lens of the eyepiece L36 form an eyepiece zoom group 32; the seventh lens of the eyepiece L37 and the eighth lens of the eyepiece L38 form an eyepiece fixed group 33.
[0027] The focal lengths of all lens groups satisfy the following condition: −1.4 <F31 / F32<−0,9; 1.2 <F33 / F32<1,7;
[0028] Where F 31 the combined focal length of the eyepiece compensation group (31), F 32 the combined focal length of the eyepiece zoom group (32) and F 33 the combined focal length of the fixed eyepiece group (33) is.
[0029] The magnification ratio of the zoom binoculars is F1 / F3, 20 <F1 / F3<60, wobei F1 die kombinierte Brennweite der Objektivgruppe 1 und F3 die kombinierte Brennweite der Okulargruppe 3 ist. Bei einer Vergrößerungsrate des Zoom-Fernglases von 60 ist F1 / F3=60; bei einer Vergrößerungsrate des Zoom-Fernglases von 20 ist F1 / F3=20.
[0030] The eyepiece zoom group 32 and the eyepiece compensation group 31 can be moved closer together or further apart along the direction of the optical axis to achieve a continuous change in the magnification rate in the range between 60 and 20.
[0031] In the present embodiment, the second lens of objective L12 and the third lens of objective L13 are cemented at their points of contact; the first lens of eyepiece L31 and the second lens of eyepiece L32 are cemented at their points of contact; the third lens of eyepiece L33 and the fourth lens of eyepiece L34 are cemented at their points of contact; the fifth lens of eyepiece L35 and the sixth lens of eyepiece L36 are cemented at their points of contact; and the seventh lens of eyepiece L37 and the eighth lens of eyepiece L38 are cemented at their points of contact. Cementing the positive and negative lenses can significantly improve the problem of chromatic aberration in the zoom binoculars. At the same time, the overall length of the entire optical system is reduced after cementing the lenses.
[0032] When the eyepiece zoom group 32 is moved along the optical axis, the eyepiece compensation group 31 is moved in the opposite direction along the optical axis to compensate for the image plane movement caused by the movement of the eyepiece zoom group 32, thereby achieving a continuous change in the magnification rate from 20x-60x. As the distance between the eyepiece zoom group 32 and the eyepiece compensation group 31 increases, the combined focal length F3 of the eyepiece group 3 gradually shortens. The combined focal length F1 of the objective group 1 remains unchanged, the magnification rate of the zoom binoculars becomes larger, and the viewed objects become larger as the distance between the eyepiece zoom group 32 and the eyepiece compensation group 31 decreases; the length F3 of the eyepiece group 3 gradually lengthens.The combined focal length F1 of lens group 1 remains unchanged, the magnification rate of the zoom binoculars becomes smaller, the objects seen become smaller, but the field of view is wider.
[0033] At least one of the first right-angle prism L21 and the second right-angle prism L22 of the prism group 2 is provided so as to be movable along the optical axis direction. For example, the first right-angle prism L21 can move forward and backward along the optical axis direction, thereby changing the overall optical length in the optical axis direction to achieve focusing. However, since the right-angle prism itself has the function of folding the light path and changing the direction of the light path, the overall length of the product does not change even if the prism moves back and forth.
[0034] The aperture range of the first lens of the L11 lens of the zoom binoculars is 70-90 mm.
[0035] When the magnification of zoom binoculars varies between 60x and 20x, the exit pupil diameter varies from 1.5 mm to 4 mm, and the eye relief varies from 16 mm to 20 mm. A longer eye relief makes them more suitable for users of different sizes.
[0036] The total weight of the zoom binoculars is 1500 g and the total optical length does not exceed 400 mm. This lightweight and compact zoom binocular enhances the product's portability.
[0037] The following Table 1 lists the actual parameters of each lens of this embodiment, which correspond to the mathematical relationships mentioned above: Table 1 lens Serial number Y-radius (mm) Thickness (mm) Refractive index Abbe number First lens of the objective 1 104,642 10,82 1,483 83,59 2 392,307 44,87 Second lens of the objective 3 309,984 1,84 1,749 43,92 Third lens of the objective 4 70,492 10,52 1,468 77,11 5 Infinite 28,11 Fourth lens 6 -306,425 1,65 1,499 65,00 of the lens 7 508,025 183,07 Prism group / / / / / 8 Infinite 14,69 protective glass 9 Infinite 2,14 1,517 64,20 10 Infinite D(10) First lens of the eyepiece 11 -21,377 1,24 1,578 70,00 Second lens of the eyepiece 12 37,827 10,89 1,952 28,76 13 43,191 D(13) Third lens of the eyepiece 14 -70,526 6,30 1,921 27,50 Fourth lens of the eyepiece 15 59,853 8,13 1,631 58,49 16 -33,810 0,35 Fifth lens of the eyepiece 17 41,775 9,52 1,712 56,26 Sixth lens of the eyepiece 18 -38,243 1,33 1,708 23,44 19 -117,731 D(19) Seventh lens of the eyepiece 20 18,259 8,50 1,612 51,07 Eighth lens of the eyepiece 21 -52,865 1,18 1,865 29,70 22 113,771 19,50
[0038] The zoom binoculars switch from 60x magnification to 20x magnification. The changes in the air gap parameters are shown in Table 2 below: Table 2 60X 20X D(10) 2,38 14,32 D(13) 52,06 9,09 D(19) 3,00 34,03
[0039] In Table 2, D(10) is the central air gap between the first lens of eyepiece L31 and the protective glass L30 in the direction of the optical axis; D(13) is the central air gap between the second lens of eyepiece L32 and the third lens of eyepiece L33 in the direction of the optical axis; D(19) is the central air gap between the sixth lens of eyepiece L36 and the lens of eyepiece L37 in the direction of the optical axis.
[0040] In summary, these zoom binoculars offer the following advantages: First, in terms of performance, it achieves high resolution in the center of the field of view and in the large field of view, and uses multiple groups of cemented lenses and low dispersion glass to significantly reduce chromatic aberration; Second, the magnification rate of the zoom binoculars can be continuously adjusted to meet the requirements of different observation objects by moving the eyepiece zoom group 32 and the eyepiece compensation group 31 closer to each other or farther apart along the optical axis; Thirdly, the zoom binoculars achieve internal focusing through a right-angle prism, which can ensure stable imaging when used at different object distances; Fourthly, the zoom binoculars significantly shorten the overall length of the optical system through a sensible lens arrangement, thereby reducing the weight of the final product and providing the user with great comfort.
[0041] Naturally, the above-mentioned embodiments serve only as examples for clear explanation and are not intended to limit the possible embodiments. For general technical personnel in this field, other forms of changes or modifications are also possible based on the above description. A complete list of all embodiments is neither necessary nor possible. The obvious changes or modifications derived therefrom remain within the scope of protection of this utility model.
Claims
[1] Zoom binoculars, characterized by that it comprises an objective group (1), a prism group (2) and an eyepiece group (3) arranged successively along the direction of the optical axis; wherein the lens group (1) comprises a first lens of a lens (L11) with a positive optical focal length, a second lens of a lens (L12) with a negative optical focal length, a third lens of a lens (L13) with a positive optical focal length and a fourth lens of a lens (L14) with a negative optical focal length, which are arranged sequentially along the direction of the optical axis from the object side to the observation side; wherein this eyepiece group (3) comprises a first lens of an eyepiece (L31) with a negative optical focal length, a second lens of an eyepiece (L32) with a positive optical focal length, a third lens of an eyepiece (L33) with a negative optical focal length, a fourth lens of an eyepiece (L34) with a positive optical focal length, a fifth lens of an eyepiece (L35) with a positive optical focal length and a sixth lens of an eyepiece (L36) with a negative optical focal length, a seventh lens of an eyepiece (L37) with a positive optical focal length and an eighth lens of an eyepiece (L38) with a negative optical focal length, which are arranged sequentially along the direction of the optical axis from the object side to the observation side; wherein the first lens of the eyepiece (L31) and the second lens of the eyepiece (L32) form an eyepiece compensation group (31); the third lens of the eyepiece (L33), the fourth lens of the eyepiece (L34), the fifth lens of the eyepiece (L35), and the sixth lens of the eyepiece (L36) form an eyepiece zoom group (32); the seventh lens of the eyepiece (L37) and the eighth lens of the eyepiece (L38) form an eyepiece fixed group (33); wherein the focal lengths of all lens groups satisfy the following conditional expression: −1.4 <F31 / F32<−0,9; 1.2 <F33 / F32<1,7; Where F 31 the combined focal length of the eyepiece compensation group (31), F 32 the combined focal length of the eyepiece zoom group (32) and F 33 is the combined focal length of the fixed eyepiece group (33); The magnification of the zoom binoculars is F1 / F3, 20 <F1 / F3<60; wobei F1 die kombinierte Brennweite der Objektivgruppe (1) und F3 die kombinierte Brennweite der Okulargruppe (1) ist; wobei die Okularzoomgruppe (32) und die Okularkompensationsgruppe (31) entlang der Richtung der optischen Achse näher zueinander oder weiter voneinander entfernt bewegt werden können, um eine kontinuierliche Änderung der Vergrößerungsrate in dem Bereich zwischen 60 und 20 zu erreichen. [2] Zoom binoculars according to claim 1, characterized by in that the prism group (2) comprises a first right-angle prism (L21), a second right-angle prism (L22) and a half-pentaprism (L23) arranged sequentially along the direction of the optical axis from the object side to the observation side; wherein the half-pentaprism (L23) is used to change the direction of the optical axis. [3] Zoom binoculars according to claim 2, characterized bythat at least one of the first rectangular prism (L21) and the second rectangular prism (L22) is provided to be movable along the direction of the optical axis; wherein the focusing is achieved by moving the first rectangular prism (L21) and / or the second rectangular prism (L22). [4] Zoom binoculars according to claim 1, characterized bythat the second lens of the objective (L12) and the third lens of the objective (L13) are cemented at the sides where they meet; the first lens of the eyepiece (L31) and the second lens of the eyepiece (L32) are cemented at the sides where they meet; the third lens of the eyepiece (L33) and the fourth lens of the eyepiece (L34) are cemented at the sides where they meet; the fifth lens of the eyepiece (L35) and the sixth lens of the eyepiece (L36) are cemented at the sides where they meet; and the seventh lens of the eyepiece (L37) and the eighth lens of the eyepiece (L38) are cemented at the sides where they meet. [5] Zoom binoculars according to claim 1, characterized by that when the eyepiece zoom group (32) is moved along the optical axis, the eyepiece compensation group (31) is moved in the opposite direction along the optical axis. [6] Zoom binoculars according to claim 1, characterized bythat the eyepiece group (3) is provided with a protective glass (30) on one side near the prism group (2). [7] Zoom binoculars according to claim 1, characterized by that the aperture of the first lens of the lens (L11) is in the range of 70-90 mm. [8] Zoom binoculars according to claim 1, characterized by that when the magnification rate of the zoom binoculars is varied between 60x and 20x, the diameter of the exit pupil of the zoom binoculars is varied in a range of 1.5 mm to 4 mm. [9] Zoom binoculars according to claim 1, characterized by that when the magnification rate of the zoom binoculars varies between 60x and 20x, the exit pupil distance of the zoom binoculars is 16-20 mm. [10] Zoom binoculars according to claim 1, characterized by that the total weight of the zoom binoculars does not exceed 1500 g and the total optical length does not exceed 400 mm.