Compact continuous zoom eyepiece

Abstract

The invention discloses a compact continuous zoom eyepiece, which comprises an eyepiece sleeve, an eyepiece joint, a zoom hand wheel, a switching circuit board group, a display screen group, an image rotation lens group and an eyepiece group, the eyepiece joint is respectively connected with an external sighting telescope body and an eyepiece sleeve; the display screen group comprises a display screen, a display screen circuit board and a display screen frame; the switching circuit board group is fixed in the eyepiece connector, and the display screen group is fixed in the front end of the relay lens group; the front end and the rear end of the image rotation lens group are fixed to the eyepiece connector and the eyepiece sleeve respectively, the image rotation lens group comprises an image rotation lens tube, a zoom tube, a first focusing lens group, a second focusing lens group and a third focusing lens group, and the zoom hand wheel is arranged on the outer side of the eyepiece sleeve in a sleeving mode and is in transmission connection with the first focusing lens group and the second focusing lens group; the eyepiece group is connected to the rear end of the eyepiece sleeve. According to the eyepiece, zoom adjustment of a traditional white light sighting telescope is fused to a digital sighting telescope, and zoom operation of a user is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of sights, and in particular to a compact continuously variable magnification eyepiece. Background Art

[0002] At present, digital gun sights are developing very rapidly, and their functions are becoming more and more powerful. As a basic function of gun sights, digital gun sights usually control the electronic magnification by adjusting the function menu to achieve magnified observation of the target image. For traditional white light sights, the magnification is adjusted by directly turning the magnification hand wheel. By comparison, it can be seen that the operation of digital gun sights in achieving the magnification function is cumbersome, deviating from the traditional usage habits, and bringing many inconveniences to users. Summary of the invention

[0003] The purpose of the present invention is to provide a compact continuous zoom eyepiece, which combines a traditional zoom hand wheel with a digital sight to facilitate the zoom operation of the user.

[0004] In order to solve the above technical problems, the present invention provides a compact continuous zoom eyepiece, comprising: an eyepiece barrel, an eyepiece joint, a display screen group, a zoom hand wheel, a switching circuit board group, a transfer lens group, and an eyepiece group; The eyepiece connector is respectively connected with the external sight body and the eyepiece tube; The display screen group includes a display screen, a display screen circuit board, and a display screen frame; the adapter circuit board group is fixed in the eyepiece joint, and the display screen group is fixed in the front end of the image transfer lens group; The front and rear ends of the image transfer lens group are respectively fixed to the eyepiece joint and the eyepiece barrel. The image transfer lens group includes an image transfer lens tube, a zoom tube, a first focusing lens group, a second focusing lens group, and a third focusing lens group. The zoom hand wheel is sleeved on the outside of the eyepiece barrel and is transmission-connected with the first focusing lens group and the second focusing lens group. The eyepiece group is connected to the rear end of the eyepiece tube.

[0005] According to the above scheme, the first focusing lens group includes a first focusing lens and a first focusing lens frame, the second focusing lens group includes a second focusing lens and a second focusing lens frame, and the third focusing lens group includes a field lens and a third focusing lens frame; The field lens is fixed to the third focusing lens frame, and the third focusing lens frame is fixed to the front end of the image transfer lens tube; A straight groove is arranged on the side of the image transfer lens tube; The zoom tube sleeve is arranged outside the image transfer lens tube, and the zoom tube is axially limited by the front end of the transfer lens tube and the zoom tube pressure ring; the side of the zoom tube is provided with a first curved groove and a second curved groove; The first focusing lens and the second focusing lens are fixed in the first focusing lens frame and the second focusing lens frame respectively. The first focusing lens frame and the second focusing lens frame can slide axially in the image transfer lens tube. The first focusing lens frame and the second focusing frame are both connected to the outside of the first focusing lens frame and the second focusing frame. The outer ends of the sliding screws pass through the straight groove of the image transfer lens tube and are respectively located in the first curved groove and the second curved groove of the magnification change tube. A zoom slot with a certain opening angle is arranged on the side of the eyepiece barrel, the outer end of the zoom rotating screw is fixed to the zoom handwheel, and the inner end of the zoom rotating screw passes through the zoom slot of the eyepiece barrel and is connected to the zoom tube.

[0006] According to the above solution, a gasket is arranged between the end of the image relay lens tube and the end of the magnification changer tube.

[0007] According to the above solution, the maximum rise angle of the first curved groove and the second curved groove is 35.5°.

[0008] According to the above scheme, the eyepiece assembly is connected to the eyepiece barrel through a multi-start thread.

[0009] According to the above scheme, a stop ring is connected to the rear end of the eyepiece tube.

[0010] According to the above scheme, the optical system of the compact continuous zoom eyepiece includes a field stop, a field lens, a first focusing lens group, a second focusing lens group, and an eyepiece group optical system which are arranged in sequence from the display screen to the human eye; The first focusing lens group is formed by gluing together a first focusing lens with positive focal power, a second focusing lens with negative focal power, and a third focusing lens with positive focal power, which are arranged in sequence from the display screen to the human eye; The second focusing lens group includes a fourth focusing lens with positive focal power, a fifth focusing lens with positive focal power, and a sixth focusing lens with positive focal power, which are sequentially arranged from the display screen to the human eye; The eyepiece optical system comprises a first eyepiece lens with negative focal power, a second eyepiece lens with positive focal power, a third eyepiece lens with positive focal power, and a fourth eyepiece lens with positive focal power, which are arranged in sequence from the display screen to the human eye.

[0011] According to the above scheme, all lenses in the optical system of the compact continuous zoom eyepiece are made of glass material.

[0012] According to the above scheme, the focal length fa of the field lens satisfies: 1047.93mm≤fa≤1069.11mm; The focal length fb of the first focusing lens group satisfies: 57.45 mm ≤ fb ≤ 63.49 mm; The focal length fc of the second focusing lens group satisfies: 18.28 mm ≤ fc ≤ 20.20 mm; The focal length fd of the eyepiece optical system satisfies: 21.52mm≤fd≤23.78mm; The first lens of the eyepiece and the second lens of the eyepiece are glued to form an eyepiece glued lens, and the focal length fe of the eyepiece glued lens satisfies: 93.2mm≤fe≤95.08mm.

[0013] According to the above scheme, the air gap between the field stop and the field lens is 9.01mm; The variable air gap between the field lens and the first focusing lens group ranges from 1.82mm to 14.5mm; The variable air gap between the first focusing lens group and the second focusing lens group is 0.25 mm to 4.4 mm; The variable air gap between the second focusing lens group and the eyepiece group optical system is 27.92mm~15.65mm; The image transfer lens group forms an image on the diopter adjustment image plane, and the diopter adjustment image plane and the field aperture are conjugate surfaces of each other; the air gap between the diopter adjustment image plane and the optical system of the eyepiece group is 12.8 mm.

[0014] Beneficial Effects The present invention solves the problem that the conventional digital sight is inconvenient to use when performing digital magnification change by key control by integrating the magnification change method of the conventional white light sight with the magnification change hand wheel into the digital sight. The magnification change method of the present invention is more in line with the user's usage habits and improves the convenience of use of the sight. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded schematic diagram of a compact continuous zoom eyepiece according to an embodiment of the present invention; Figure 2 is a stereoscopic diagram of a compact continuous zoom eyepiece according to an embodiment of the present invention; Figure 3 is a cross-sectional view of a compact continuous zoom eyepiece according to an embodiment of the present invention; Figure 4 is an optical system diagram of a compact continuous zoom eyepiece according to an embodiment of the present invention at a high magnification of 19.8×; Figure 5 is a vertical axis chromatic aberration diagram of a compact zoom eyepiece according to an embodiment of the present invention at a high magnification of 19.8×; Figure 6 This is an MTF diagram of a compact zoom eyepiece according to an embodiment of the present invention at a high magnification of 19.8×; Figure 7 This is a distortion field curvature diagram of a compact zoom eyepiece according to an embodiment of the present invention at a high magnification of 19.8×; Figure 8 is an optical system diagram of a compact continuous zoom eyepiece according to an embodiment of the present invention at a low magnification of 6.6×; Fig. 9 This is a vertical axis chromatic aberration diagram of a compact zoom eyepiece according to an embodiment of the present invention at a low magnification of 6.6×; Fig.10 This is an MTF diagram of a compact zoom eyepiece according to an embodiment of the present invention at a low magnification of 6.6×; Fig.11 This is a distortion field curvature diagram of a compact zoom eyepiece according to an embodiment of the present invention at a low magnification of 6.6×; Fig.12 is a schematic diagram of a display screen group adjustment state according to an embodiment of the present invention; Fig.13 It is a schematic diagram of the connection between a compact continuous zoom eyepiece and an external sighting scope body according to an embodiment of the present invention.

[0016] In the figure: 1-eyepiece group, 2-image transfer lens group, 3-display screen group, 4-adapter circuit board group, 5-eyepiece joint, 6-eyepiece tube, 7-display screen adjustment ring, 8-zoom hand wheel, 9-image transfer group pressure ring, 10-retraction ring, 11-diopter adjustment ring, 12-zoom rotation screw, 13-first sealing ring, 14-second sealing ring, 15-first tightening screw, 16-screw, 17-second tightening screw. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0018] See also Figure 1~Figure 3 , this embodiment provides a compact continuous zoom eyepiece, including: an eyepiece barrel 6, an eyepiece joint 5, a zoom hand wheel 8, a switching circuit board group 4, a display screen group 3, a transfer lens group 2, and an eyepiece group 1; The eyepiece connector 5 is connected to the external sighting scope body and the eyepiece barrel respectively (specifically, see Fig.13 , the eyepiece connector 5 is connected to the sight body through an internal thread, and is connected to the eyepiece tube 6 through an external thread); The display screen group 3 includes a display screen, a display screen circuit board, and a display screen frame; the adapter circuit board group 4 is fixed in the eyepiece joint 5, and the display screen group 3 is fixed in the front end of the image transfer lens group 2; The front and rear ends of the image transfer lens group 2 are respectively fixed to the eyepiece joint 5 and the eyepiece barrel 6. The image transfer lens group 2 includes an image transfer lens tube, a zoom tube, a first focus lens group, a second focus lens group, and a third focus lens group. The zoom hand wheel 8 is sleeved on the outside of the eyepiece barrel 6 and is transmission-connected with the first focus lens group and the second focus lens group. The eyepiece assembly 1 is connected to the rear end of the eyepiece tube 6 .

[0019] Furthermore, the rear end of the eyepiece connector 5 is inserted into the front end of the eyepiece barrel 6 , and the eyepiece connector 5 and the eyepiece barrel 6 are fixed by a first locking screw 15 .

[0020] Furthermore, a first sealing ring 13 is provided between the eyepiece joint 5 and the eyepiece barrel 6 .

[0021] Furthermore, a square groove bottom surface is provided in the eyepiece joint 5 , and the adapter circuit board assembly 4 is fixed to the square groove bottom surface by screws 16 .

[0022] Furthermore, the image relay lens group 2 is fixed to the rear end surface of the eyepiece joint 5 by means of screws 16 .

[0023] Furthermore, the steering lens group includes a steering lens tube, a zoom tube, a first focusing lens group, a second focusing lens group, and a third focusing lens group; The field lens is fixed to the third focusing lens frame through a pressing ring; A straight groove is arranged on the side of the image transfer lens tube; The zoom tube sleeve is arranged outside the image transfer lens tube, and the zoom tube is axially limited by the front end of the steering lens tube and the zoom tube pressure ring, and the image transfer group pressure ring 9 is fixed to the rear end of the steering lens tube; the side of the zoom tube is provided with a first curved groove and a second curved groove; The first focusing lens and the second focusing lens are fixed in the first focusing lens frame and the second focusing lens frame respectively. The first focusing lens frame and the second focusing lens frame can slide axially in the image transfer lens tube. The first focusing lens frame and the second focusing frame are both connected to the outside of the first focusing lens frame and the second focusing frame. The outer ends of the sliding screws pass through the straight groove of the image transfer lens tube and are respectively located in the first curved groove and the second curved groove of the magnification change tube. A zoom groove with a certain opening angle is provided on the side of the eyepiece barrel 6, the outer end of the zoom rotating screw 12 is fixed to the zoom hand wheel 8, and the inner end of the zoom rotating screw 12 passes through the zoom groove of the eyepiece barrel 6 and is connected to the zoom tube.

[0024] The magnification principle is: turn the magnification hand wheel 8, the magnification hand wheel 8 drives the magnification rotating screw 12 to move in the magnification slot of the eyepiece tube 6, and the magnification rotating screw 12 drives the magnification tube to rotate, so that the sliding screws in the first curved slot and the second curved slot respectively drive the first focusing lens frame and the second focusing lens frame to move axially along the straight slot of the image transfer lens tube, thereby changing the magnification of the eyepiece imaging, and the user can observe the magnified display screen image at one end of the eyepiece group 1.

[0025] Furthermore, a gasket is provided between the end of the image transfer lens tube and the end of the zoom tube. The gasket is made of copper, which can make the rotation between the image transfer lens tube and the zoom tube smoother, optimize the zoom feel, and increase the wear resistance between the structural parts.

[0026] Furthermore, the maximum rise angle of the first curved groove and the second curved groove is 35.5°, which ensures smooth movement and comfortable hand feel during the zoom process.

[0027] Furthermore, the rear end of the steering lens group is fastened in the eyepiece barrel 6 by a steering lens group pressing ring 9 , the steering lens group pressing ring 9 is threadedly connected to the eyepiece barrel 6 , and the steering lens group pressing ring 9 and the eyepiece barrel 6 are fastened by a second tightening screw 17 .

[0028] Furthermore, a second sealing ring 14 is provided between the zoom hand wheel 8 and the eyepiece barrel 6 to ensure air tightness and optimize the rotation feel of the zoom hand wheel 8 .

[0029] Furthermore, the compact continuous zoom eyepiece also includes a display screen adjustment mechanism, which includes a display screen adjustment ring 7 arranged on both sides of the display screen, and a plurality of adjustment holes are arranged on the side of the display screen adjustment ring 7. The display screen adjustment ring 7 is threadedly connected to the front end of the image transfer lens tube, and the side of the image transfer lens tube is provided with an adjustment notch; a guide block is arranged at the front end of the steering lens group, and a guide groove is arranged on the end surface of the display screen, and the guide groove is precisely matched with the guide block; The adjustment process of the display screen is as follows: when the display screen is in the adjustment state, the eyepiece tube 6 is not installed, see Fig.12 At this time, the display screen adjustment rings 7 on both sides of the display screen are rotated by adjusting the notches and the adjustment holes, so that the display screen adjustment rings 7 drive the display screen to move axially along the guide blocks (the horizontal tilt angle of the display screen can always meet the use requirements during the adjustment process); when the image plane of the display screen coincides with the image plane of the image transfer lens group 2, the adjustment is completed. At this time, the display screen adjustment rings 7 are fixed to the front end of the image transfer lens tube by dispensing glue and stop screws, thereby fixing the position of the display screen.

[0030] Furthermore, the eyepiece assembly 1 is connected to the eyepiece barrel 6 via a multi-start thread.

[0031] Furthermore, a diopter adjustment ring 11 is provided at the rear end of the eyepiece assembly 1 for rotating the eyepiece assembly 1 to adjust the diopter.

[0032] Furthermore, a stop ring 10 is connected to the rear end of the eyepiece barrel 6 to limit the movement of the eyepiece group 1 and prevent the eyepiece group 1 from rotating out of the eyepiece barrel 6 .

[0033] Furthermore, a third sealing ring is provided between the eyepiece group 1 and the eyepiece barrel 6 .

[0034] Furthermore, the optical system of the compact continuous zoom eyepiece includes a field stop, a field lens, a first focusing lens group, a second focusing lens group, and an eyepiece group 1 optical system arranged in sequence from the display screen to the human eye; The first focusing lens group is formed by gluing together a first focusing lens with positive focal power, a second focusing lens with negative focal power, and a third focusing lens with positive focal power, which are arranged in sequence from the display screen to the human eye; The second focusing lens group includes a fourth focusing lens with positive focal length, a fifth focusing lens with positive focal length (in this embodiment, the fifth focusing lens is an aspherical lens, which can reduce the spherical aberration of the optical system), and a sixth focusing lens with positive focal length, which are sequentially arranged from the display screen to the human eye. The optical system of the eyepiece group 1 includes a first eyepiece lens with negative focal power, a second eyepiece lens with positive focal power, a third eyepiece lens with positive focal power, and a fourth eyepiece lens with positive focal power, which are arranged in sequence from the display screen to the human eye.

[0035] Furthermore, each lens in the optical system of the compact continuous zoom eyepiece is made of glass material.

[0036] Furthermore, the focal length fa of the field lens satisfies: 1047.93 mm ≤ fa ≤ 1069.11 mm; The focal length fb of the first focusing lens group satisfies: 57.45 mm ≤ fb ≤ 63.49 mm; The focal length fc of the second focusing lens group satisfies: 18.28 mm ≤ fc ≤ 20.20 mm; The focal length fd of the optical system of the eyepiece group 1 satisfies: 21.52mm≤fd≤23.78mm.

[0037] Furthermore, the air gap between the field stop and the field lens is 9.01 mm; The variable air gap between the field lens and the first focusing lens group ranges from 1.82mm to 14.5mm; The variable air gap between the first focusing lens group and the second focusing lens group is 0.25 mm to 4.4 mm; the distance between the first focusing lens group and the second focusing lens group is greater than 4 mm, which can ensure that there is no interference between the two during the movement; The variable air gap between the second focusing lens group and the eyepiece group 1 optical system is 27.92 mm to 15.65 mm; The steering lens group forms an image on the diopter adjustment image plane, and the diopter adjustment image plane and the field stop are conjugate surfaces to each other; the air gap between the diopter adjustment image plane and the optical system of the eyepiece group 1 is 12.8 mm.

[0038] Further, the first lens of the eyepiece and the second lens of the eyepiece are glued together to form an eyepiece glued lens, and the focal length fe of the eyepiece glued lens satisfies: 93.2mm≤fe≤95.08mm.

[0039] Furthermore, the air gap between the eyepiece cemented lens and the third lens of the eyepiece is 0.2 mm.

[0040] Furthermore, the air gap between the third lens of the eyepiece and the fourth lens of the eyepiece is 0.2 mm.

[0041] In this embodiment, the optical system parameters of the compact continuous zoom eyepiece are shown in the following table: Table 1 Optical system parameters of compact zoom eyepiece

[0042] Among them, the aspheric coefficient is calculated according to the even aspheric formula

[0043] Where r is the aperture in the direction perpendicular to the optical axis, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of r along the optical axis, c is the vertex curvature radius of the surface, k is the cone coefficient, a is the high-order aspheric coefficient, see the table below, and i is the aspheric order.

[0044] Table 2 Aspheric coefficients

[0045] The variable air gap data in Table 1 is as follows: Table 3 Zoom system interval

[0046] The compact continuous zoom eyepiece of this embodiment has a zoom range of 6.6×~18.9×, an exit pupil diameter of 7 mm, an exit pupil distance of 45 mm, and is compatible with an eye mask.

[0047] When the zoom eyepiece is at high magnification 19.8×, the center MTF is greater than 0.7@30lp / mm, and the edge MTF is greater than 0.5@lp / mm; when it is at low magnification 6.6×, the center MTF is greater than 0.5@30lp / mm, and the edge MTF is greater than 0.45@30lp / mm. For the optical properties of this eyepiece at high and low magnification, see Figure 3~Figure 11 .

[0048] Furthermore, the field lens is fixed to the third focusing lens frame by a pressure ring, which is used to reduce the total length of the system and make the structure compact; the third focusing lens frame and the steering lens tube are precisely positioned and matched, and the third focusing lens frame and the image transfer lens tube can be fixed by screws and nuts.

[0049] The compact zoom eyepiece of this embodiment has a simple and compact structure (total length 76mm), is easy to process and assemble, and integrates the dynamic zoom adjustment method of the traditional white light sight on the basis of the digital gun sight, making it easy to use. The eyepiece can work stably and reliably in high and low temperature, rain, impact, vibration and other environments.

[0050] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0051] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compact zoom eyepiece, characterized in that: include: Eyepiece tube, eyepiece joint, display screen assembly, zoom hand wheel, adapter circuit board assembly, image transfer lens assembly, eyepiece assembly; The eyepiece connector is respectively connected with the external sight body and the eyepiece tube; The display screen group includes a display screen, a display screen circuit board, and a display screen frame; The adapter circuit board group is fixed in the eyepiece joint, and the display screen group is fixed in the front end of the image transfer lens group; The front and rear ends of the image transfer lens group are respectively fixed to the eyepiece joint and the eyepiece barrel. The image transfer lens group includes an image transfer lens tube, a zoom tube, a first focusing lens group, a second focusing lens group, and a third focusing lens group. The zoom hand wheel is sleeved on the outside of the eyepiece barrel and is transmission-connected with the first focusing lens group and the second focusing lens group. The eyepiece group is connected to the rear end of the eyepiece tube.

2. The compact zoom eyepiece according to claim 1, characterized in that: The first focusing lens group includes a first focusing lens and a first focusing lens frame, the second focusing lens group includes a second focusing lens and a second focusing lens frame, and the third focusing lens group includes a field lens and a third focusing lens frame; The field lens is fixed to the third focusing lens frame, and the third focusing lens frame is fixed to the front end of the image transfer lens tube; A straight groove is arranged on the side of the image transfer lens tube; The zoom tube sleeve is arranged outside the image transfer lens tube, and the zoom tube is axially limited by the front end of the transfer lens tube and the zoom tube pressure ring; the side of the zoom tube is provided with a first curved groove and a second curved groove; The first focusing lens and the second focusing lens are fixed in the first focusing lens frame and the second focusing lens frame respectively. The first focusing lens frame and the second focusing lens frame can slide axially in the image transfer lens tube. The first focusing lens frame and the second focusing frame are both connected to the outside of the first focusing lens frame and the second focusing frame. The outer ends of the sliding screws pass through the straight groove of the image transfer lens tube and are respectively located in the first curved groove and the second curved groove of the magnification change tube. A zoom slot with a certain opening angle is arranged on the side of the eyepiece barrel, the outer end of the zoom rotating screw is fixed to the zoom handwheel, and the inner end of the zoom rotating screw passes through the zoom slot of the eyepiece barrel and is connected to the zoom tube.

3. The compact zoom eyepiece according to claim 2, characterized in that: A gasket is arranged between the end of the image relay lens tube and the end of the magnification changer tube.

4. The compact zoom eyepiece according to claim 2, characterized in that: The maximum rise angle of the first curved groove and the second curved groove is 35.5°.

5. The compact zoom eyepiece according to claim 1, characterized in that: The eyepiece assembly is connected to the eyepiece tube via a multi-start thread.

6. The compact zoom eyepiece according to claim 1 or 5, characterized in that: A stop ring is connected to the rear end of the eyepiece tube.

7. The compact zoom eyepiece according to claim 1, characterized in that: The optical system of the compact continuous zoom eyepiece includes a field stop, a field lens, a first focusing lens group, a second focusing lens group, and an eyepiece group optical system which are sequentially arranged from the display screen to the human eye; The first focusing lens group is formed by gluing together a first focusing lens with positive focal power, a second focusing lens with negative focal power, and a third focusing lens with positive focal power, which are arranged in sequence from the display screen to the human eye; The second focusing lens group includes a fourth focusing lens with positive focal power, a fifth focusing lens with positive focal power, and a sixth focusing lens with positive focal power, which are sequentially arranged from the display screen to the human eye; The eyepiece optical system comprises a first eyepiece lens with negative focal power, a second eyepiece lens with positive focal power, a third eyepiece lens with positive focal power, and a fourth eyepiece lens with positive focal power, which are arranged in sequence from the display screen to the human eye.

8. The compact zoom eyepiece according to claim 1 or 7, characterized in that: All lenses in the optical system of the compact zoom eyepiece are made of glass.

9. The compact zoom eyepiece according to claim 7, characterized in that: The focal length fa of the field lens satisfies: 1047.93mm≤fa≤1069.11mm; The focal length fb of the first focusing lens group satisfies: 57.45 mm ≤ fb ≤ 63.49 mm; The focal length fc of the second focusing lens group satisfies: 18.28 mm ≤ fc ≤ 20.20 mm; The focal length fd of the eyepiece optical system satisfies: 21.52mm≤fd≤23.78mm; The first lens of the eyepiece and the second lens of the eyepiece are glued to form an eyepiece glued lens, and the focal length fe of the eyepiece glued lens satisfies: 93.2mm≤fe≤95.08mm.

10. The compact zoom eyepiece according to claim 7, characterized in that: The air gap between the field diaphragm and the field lens is 9.01 mm; The variable air gap between the field lens and the first focusing lens group ranges from 1.82mm to 14.5mm; The variable air gap between the first focusing lens group and the second focusing lens group is 0.25 mm to 4.4 mm; The variable air gap between the second focusing lens group and the eyepiece group optical system is 27.92mm~15.65mm; The steering lens group forms an image on the diopter adjustment image plane, and the diopter adjustment image plane and the field aperture are conjugate surfaces of each other; the air gap between the diopter adjustment image plane and the optical system of the eyepiece group is 12.8 mm.

Images