A variable magnification eyepiece

Abstract

The invention discloses a variable magnification eyepiece, comprising a rotating lens joint, which is connected to an eyepiece barrel via a thread, a rotating image tube arranged in the rotating lens joint, and the rotating image tube is fixed in the rotating lens joint via a first rotating image tube pressure ring and a second rotating image tube pressure ring; a variable magnification group lens fixed by a variable magnification group frame and a variable magnification group pressure ring, a compensation group lens fixed by a compensation group frame and a compensation group pressure ring, and a field lens fixed by a field lens frame and a field lens pressure ring are arranged in the rotating image tube; a variable magnification tube is sleeved on the outer side of the rotating image tube, the variable magnification tube is fixed to the rotating image tube via the variable magnification tube pressure ring, a track groove is arranged on the variable magnification tube, the variable magnification group frame and the compensation group frame are connected to the rotating image tube via a sliding screw, one end of the sliding screw is arranged in the track groove of the variable magnification tube; a variable magnification handwheel is arranged on the outer side of the rotating lens joint, and the variable magnification handwheel is connected to the rotating image tube via a variable magnification rotating screw.

Description

Technical Field

[0001] The present invention relates to the technical field of optical eyepieces, in particular to a variable magnification eyepiece. Background Art

[0002] At present, most white-light gun-sight and telescopic systems use objective lens magnification. However, in non-white-light gun-sight and telescopic systems such as infrared digital systems, the object is imaged on the detector through the objective lens, and then the image is converted into a photoelectric image on the display screen. Existing products on the market all use electronic magnification to magnify the object image, but when the user wants to observe the image on the display screen for a second magnification, a magnification eyepiece is required. Summary of the Invention

[0003] The object of the present invention is to provide a variable magnification eyepiece to achieve secondary magnification observation of a display screen.

[0004] To solve the above technical problems, the present invention provides a technical solution: a variable magnification eyepiece, comprising a rotating lens joint, the rotating lens joint being connected to an eyepiece barrel via a thread, a rotating image tube being arranged in the rotating lens joint, and the rotating image tube being fixed in the rotating lens joint via a first rotating image tube pressure ring and a second rotating image tube pressure ring; a zoom group lens fixed by a zoom group frame and a zoom group pressure ring, a compensation group lens fixed by a compensation group frame and a compensation group pressure ring, and a field lens fixed by a field lens frame and a field lens pressure ring are arranged in the rotating image tube; a zoom tube is sleeved on the outer side of the rotating image tube, the zoom tube is fixed to the rotating image tube via the zoom tube pressure ring, a track groove is arranged on the zoom tube, the zoom group frame and the compensation group frame are connected to the rotating image tube via a sliding screw, one end of the sliding screw is arranged in the track groove of the zoom tube; a zoom handwheel is arranged on the outer side of the rotating lens joint, and the zoom handwheel is connected to the rotating image tube via a zoom rotating screw.

[0005] According to the above solution, the zoom tube is fixedly connected to the image transfer lens joint via the zoom tube limiting screw.

[0006] According to the above solution, an outer sealing ring of the image transfer lens joint is provided between the zoom hand wheel and the image transfer lens joint.

[0007] According to the above solution, an eyepiece assembly frame is connected to the eyepiece barrel via a thread, and an eyepiece assembly lens is arranged in the eyepiece assembly frame.

[0008] According to the above solution, an eyepiece rubber sleeve is provided on one end of the eyepiece assembly.

[0009] According to the above scheme, the eyepiece group lenses in the eyepiece group frame include an adjacently arranged first eyepiece lens with positive optical focal length and a second eyepiece lens with negative optical focal length, and also include a third eyepiece lens with positive optical focal length and a fourth eyepiece lens with positive optical focal length. An eyepiece first spacer is arranged between the second eyepiece lens and the third eyepiece lens, an eyepiece second spacer is arranged between the third eyepiece lens and the fourth eyepiece lens, and an eyepiece pressure ring is arranged on one side of the fourth eyepiece lens for fixing the first to fourth eyepiece lenses.

[0010] According to the above solution, a countersunk threaded hole is provided at one end of the eyepiece assembly frame, and a countersunk screw is provided in the countersunk threaded hole.

[0011] According to the above solution, a backstop ring is provided between the eyepiece barrel and the eyepiece assembly frame.

[0012] According to the above solution, a zoom tube gasket is provided at the contact surface of the zoom tube near one end of the eyepiece barrel and the image relay tube.

[0013] According to the above solution, the edge spacing between the zoom lens group and the compensation lens group is greater than 4 mm.

[0014] The beneficial effect of the present invention is that when the zoom handwheel drives the zoom tube to rotate through the zoom rotating screw, the zoom group and compensation group lenses in the image transfer tube are controlled by the sliding screw to move axially according to the trajectory of the track groove of the zoom tube, so that the compensation group moves according to a certain rule while the zoom group moves, so that the image point of the zoom group remains in the original position after passing through the compensation group. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic cross-sectional view of a variable magnification eyepiece according to an embodiment of the present invention;

[0016] Figure 2 1 is a schematic structural diagram of an eyepiece assembly according to an embodiment of the present invention;

[0017] Figure 3 This is a spot diagram of a zoom eyepiece in the 10x state according to an embodiment of the present invention;

[0018] Figure 4 10x magnification of the zoom eyepiece according to an embodiment of the present invention;

[0019] Figure 5 This is a spot diagram of a zoom eyepiece in the 31.25x state according to an embodiment of the present invention;

[0020] Figure 6 FIG. 1 is a field curvature distortion diagram of a zoom eyepiece in a 31.25x magnification state according to an embodiment of the present invention.

[0021] In the figure; 1-zoom lens group; 2-sliding screw; 3-image transfer lens connector; 4-zoom handwheel; 5-external sealing ring of image transfer lens connector; 6-zoom rotating screw; 7-first pressure ring of image transfer tube; 8-zoom tube limit screw; 9-second pressure ring of image transfer tube; 10-eyepiece lens group; 11-zoom tube pressure ring; 12-zoom tube; 13-image transfer tube; 14-compensating lens group; 15-zoom tube gasket; 16-field lens frame; 17-field lens pressure ring; 18-countsunk screw; 19-eyepiece barrel; 20-stop ring; 21-eyepiece rubber sleeve; 22-eyepiece first lens; 23-eyepiece second lens; 24-eyepiece third lens; 25-eyepiece fourth lens; 26-eyepiece first spacer; 27-eyepiece second spacer; 28-eyepiece pressure ring. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying 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.

[0023] See also Figure 1 、 Figure 2A zoom eyepiece with a zoom range of 8mm-25mm, a continuous zoom range of 10x-31.25x, and a zoom ratio of approximately 1:3. The eyepiece adopts a two-component continuous zoom system, including a movable lens group, an eyepiece group, a zoom rotating screw, an eyepiece barrel, and an inner sealing ring. The movable lens group includes a zoom lens group 1 (the zoom lens group 1 includes a first zoom lens group with negative optical power and a second zoom lens group with positive optical power), a compensating lens group 14 with positive optical power, and a field lens with negative optical power. The frames for fixing the zoom lens group 1 and the compensating lens group 14 are respectively connected to the image rotating tube 13 by a sliding screw 2. When the zoom handwheel 4 is rotated, which drives the zoom tube 12 to rotate via the zoom rotating screw 6, the zoom lens group 1 and the compensating lens group 14 in the image rotating tube 13 are controlled by the sliding screw 2 to move axially along the groove track of the zoom tube 12. The eyepiece assembly 10 includes a first eyepiece lens 22 with positive optical power, a second eyepiece lens 23 with negative optical power, a third eyepiece lens 23 with positive optical power, a fourth eyepiece lens 25 with positive optical power, an eyepiece frame, a first eyepiece spacer 26, a second eyepiece spacer 27, an eyepiece pressure ring 28, an eyepiece rubber sleeve 21, and an eyepiece backstop 20. The eyepiece assembly lens 10 is secured by the eyepiece frame, spacers, and pressure ring. Rotating the eyepiece rubber sleeve 21 drives the eyepiece assembly lens 10 to rotate axially for adjustment of the diopter. The eyepiece backstop 20 serves as a position limiter. The eyepiece barrel 19 is threadedly connected to the image transfer lens joint, thereby connecting the movable lens assembly and the eyepiece assembly lens 10.

[0024] When the zoom lens group 1 moves axially along the optical axis, the system's combined focal length changes, and the image of the zoom lens group 1 also moves accordingly. To maintain the image plane of the system stationary, the compensating lens group 14 moves simultaneously with the movement of the zoom lens group 1 according to a specific pattern, so that the image point of the zoom lens group 1 remains in its original position after passing through the compensating lens group 14. The movement pattern of the compensating lens group 14 is nonlinear and corresponds to the movement of the zoom lens group 1. Light passes through the image transfer lens group and is formed on the second image plane. It then passes through the eyepiece lens group 10 as parallel light, and is imaged on the retina.

[0025] Furthermore, the edge spacing between the zoom lens group 1 and the compensation lens group 14 is greater than 4 mm, ensuring that the lens frames of the two will not interfere with each other during movement.

[0026] Furthermore, the maximum rise angle of the curves of the lens frames of the zoom lens group 1 and the compensation lens group 14 is 35.5°, ensuring smooth movement and comfortable hand feel during the zoom process.

[0027] Furthermore, the field lens is fixed by a field lens frame 16 and a field lens pressing ring 17, so as to reduce the total length of the system and make the structure compact.

[0028] Furthermore, the zoom tube limiting screw 8 fixes the image relay tube 13 and the image relay lens joint 3 so that the image relay tube 13 does not generate rotation error.

[0029] Furthermore, after the image tube 13 is axially adjusted to produce a clear image, the image tube 13 is secured on either side by the image tube's first pressure ring 7 and the steering tube's second pressure ring 9. This prevents axial movement errors in the image tube 13 and stabilizes the conjugate image plane within the moving lens assembly. During assembly, the image tube's first pressure ring 7 is used to determine the image tube's position. After fine-tuning the image tube 13 to achieve a clear image, the second pressure ring 9 is used to secure the image tube.

[0030] Furthermore, an image transfer lens joint outer sealing ring 5 is designed between the zoom hand wheel 4 and the image transfer lens joint 3 to seal the gas after nitrogen flushing and optimize the rotation feel of the zoom hand wheel 4 .

[0031] Furthermore, a zoom tube washer 15 is designed between the image transfer tube 13 and the zoom tube 12 to make the zoom hand wheel 4 rotate more smoothly, and the copper washer used has a wear-resistant effect.

[0032] Furthermore, the eyepiece frame is designed with an air guide hole and a countersunk screw 18 to ensure the air tightness of the product after nitrogen flushing.

[0033] Furthermore, the image relay tube 13 is designed with a magnification curve groove.

[0034] Furthermore, a handwheel rubber sleeve is provided on the outside of the zoom handwheel 4 .

[0035] Figure 3 This is the spot diagram of the embodiment of the present invention at 10x magnification. The root mean square radius is basically within 50 μm, which has met the basic requirements of eyepiece design. Figure 4 This is a diagram of field curvature distortion at 10x magnification of an embodiment of the present invention. The central field curvature and distortion are well corrected, with the maximum distortion occurring at the edge of the field of view, at approximately 2.5%, meeting the maximum distortion requirement of the eyepiece. Figure 5 This is the spot diagram of the embodiment of the present invention at 31.25x magnification. The root mean square radius is basically within 50 μm, which has met the basic requirements of eyepiece design. Figure 6 This is a field curvature distortion diagram of an embodiment of the present invention at 31.25x magnification. The central field curvature and distortion are well corrected, and the maximum distortion occurs in the peripheral field of view, with a value of about 2.5%, which meets the maximum distortion requirement of the eyepiece.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A variable magnification eyepiece, characterized by: The invention comprises an image transfer lens joint, which is connected to an eyepiece barrel via a threaded connection, an image transfer tube provided in the image transfer lens joint, and the image transfer tube is fixed in the image transfer lens joint via a first image transfer tube pressure ring and a second image transfer tube pressure ring; a zoom group lens fixed by a zoom group frame and a zoom group pressure ring, a compensation group lens fixed by a compensation group frame and a compensation group pressure ring, and a field lens fixed by a field lens frame and a field lens pressure ring are provided in the image transfer tube; a zoom tube is sleeved on the outer side of the image transfer tube, the zoom tube is fixed to the image transfer tube via the zoom tube pressure ring, a track groove is provided on the zoom tube, the zoom group frame and the compensation group frame are connected to the image transfer tube via a sliding screw, one end of the sliding screw is provided in the track groove of the zoom tube; a zoom handwheel is provided on the outer side of the image transfer lens joint, and the zoom handwheel is connected to the image transfer tube via a zoom rotating screw; The zoom tube is fixedly connected to the image transfer lens joint via a zoom tube limit screw; An outer sealing ring of the image transfer lens joint is provided between the zoom hand wheel and the image transfer lens joint; A zoom tube gasket is provided at a contact surface of the zoom tube near one end of the eyepiece barrel and the image relay tube; The edge spacing between the zoom lens group and the compensation lens group is greater than 4mm.

2. The variable magnification eyepiece according to claim 1, characterized in that: An eyepiece group frame is connected to the eyepiece barrel through a thread, and an eyepiece group lens is arranged in the eyepiece group frame.

3. The variable magnification eyepiece according to claim 2, characterized in that: One end of the eyepiece assembly is covered with an eyepiece rubber sleeve.

4. The variable magnification eyepiece according to claim 2, wherein: The eyepiece group lenses in the eyepiece group frame include an adjacently arranged first eyepiece lens with positive optical power and a second eyepiece lens with negative optical power, and also include a third eyepiece lens with positive optical power and a fourth eyepiece lens with positive optical power. A first eyepiece spacer is provided between the second eyepiece lens and the third eyepiece lens, a second eyepiece spacer is provided between the third eyepiece lens and the fourth eyepiece lens, and an eyepiece pressure ring is provided on one side of the fourth eyepiece lens for fixing the first to fourth eyepiece lenses.

5. The variable magnification eyepiece according to claim 2, characterized in that: One end of the eyepiece assembly frame is provided with a countersunk threaded hole, and a countersunk screw is provided in the countersunk threaded hole.

6. The variable magnification eyepiece according to claim 2, characterized in that: A stop ring is provided between the eyepiece tube and the eyepiece assembly frame.

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