CN115355759A

CN115355759A - Zoom eyepiece

Info

Publication number: CN115355759A
Application number: CN202211011117.0A
Authority: CN
Inventors: 刘昱; 吴焕新; 韩琴; 向家云
Original assignee: Wuhan Changjiang Optics Electron Co Ltd
Current assignee: Wuhan Changjiang Optics Electron Co Ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-11-18

Abstract

The invention discloses a zoom eyepiece, which comprises an image rotating lens joint, wherein the image rotating lens joint is connected with an eyepiece barrel through threads; the image relay tube is internally provided with a zoom group lens fixed by a zoom group lens frame and a zoom group pressing ring, a compensation group lens fixed by a compensation group lens frame and a compensation group pressing ring and a field lens fixed by a field lens frame and a field lens pressing ring; the outside of the image rotating tube is sleeved with a zoom tube, the zoom tube is fixed with the image rotating tube through a zoom tube pressing ring, a track groove is arranged on the zoom tube, the zoom group picture frame and the compensation group picture frame are connected with the image rotating tube through sliding sleeve screws, and one end of each sliding sleeve screw is arranged in the track groove of the zoom tube; the image-rotating lens joint is externally sleeved with a zooming hand wheel which is connected with the image-rotating tube through a zooming rotating screw.

Description

Zoom eyepiece

Technical Field

The invention relates to the technical field of optical eyepieces, in particular to a zoom eyepiece.

Background

At present, objective lenses are mostly adopted in a white light gun sighting telescope system in a variable-power mode, but in a non-white light gun sighting telescope system such as infrared digital codes and the like, an object is imaged on a detector through the objective lenses, and then is imaged on a display screen through photoelectric conversion, the existing products on the market are all imaged by an electronic variable-power amplification object, but when a user wants to perform secondary amplification observation on the imaging of the display screen, a variable-power eyepiece is needed.

Disclosure of Invention

The invention aims to provide a zoom eyepiece to realize secondary magnification observation of a display screen.

In order to solve the technical problem, the invention provides a technical scheme that: a zoom eyepiece comprises an image transfer lens joint, wherein the image transfer lens joint is connected with an eyepiece barrel through threads; the inside of the image relay tube is provided with a zoom group lens fixed by a zoom group lens frame and a zoom group pressing ring, a compensation group lens fixed by a compensation group lens frame and a compensation group pressing ring and a field lens fixed by a field lens frame and a field lens pressing ring; the outside of the image rotating tube is sleeved with a zoom tube, the zoom tube is fixed with the image rotating tube through a zoom tube pressing ring, a track groove is arranged on the zoom tube, the zoom group picture frame and the compensation group picture frame are connected with the image rotating tube through sliding sleeve screws, and one end of each sliding sleeve screw is arranged in the track groove of the zoom tube; the image-rotating lens joint is externally sleeved with a zooming hand wheel which is connected with the image-rotating tube through a zooming rotating screw.

According to the scheme, the zoom tube is fixedly connected with the image rotating lens joint through the zoom tube limiting screw.

According to the scheme, the image rotating lens joint outer sealing ring is arranged between the zooming hand wheel and the image rotating lens joint.

According to the scheme, the eyepiece barrel is connected with an eyepiece group lens frame through threads, and an eyepiece group lens is arranged in the eyepiece group lens frame.

According to the scheme, an eyepiece rubber sleeve is sleeved outside one end of the eyepiece group lens.

According to the scheme, the ocular group lenses in the ocular group lens frame comprise an ocular first lens with positive focal power and an ocular second lens with negative focal power which are adjacently arranged, and further comprise an ocular fourth lens with positive focal power and an ocular third lens, wherein an ocular first space ring is arranged between the ocular second lens and the ocular third lens, an ocular second space ring is arranged between the ocular third lens and the ocular fourth lens, and an ocular pressing ring used for fixing the ocular first to fourth lenses is arranged on one side of the ocular fourth lens.

According to the scheme, one end of the eyepiece group frame is provided with a countersunk threaded hole, and a countersunk screw is arranged in the countersunk threaded hole.

According to the scheme, the backstop ring is arranged between the eyepiece barrel and the eyepiece group frame.

According to the scheme, the zoom tube gasket is arranged at the position of the contact surface of the zoom tube, which is close to one end of the eyepiece sleeve, and the image rotating tube.

According to the scheme, the edge distance between the zoom group lens and the compensation group lens is larger than 4mm.

The beneficial effects of the invention are: when the zooming handwheel drives the zooming tube to rotate through the zooming rotating screw, the zooming group and the compensation group lens in the image rotating tube are controlled by the sliding sleeve screw to do axial motion according to the track of the track groove of the zooming tube, so that the compensation group is moved according to a certain rule while the zooming group is moved, and the image point of the zooming group is still at the original position after passing through the compensation group.

Drawings

Fig. 1 is a schematic cross-sectional view of a zoom eyepiece according to an embodiment of the present invention;

FIG. 2 is a schematic view of an eyepiece assembly according to an embodiment of the present invention;

fig. 3 is a dot diagram of a zoom eyepiece lens of an embodiment of the present invention in a 10-fold state;

FIG. 4 is a field curvature distortion diagram of the zoom eyepiece of the present invention in a 10-fold condition;

fig. 5 is a dot arrangement diagram of a zoom eyepiece of one embodiment of the present invention in a 31.25 magnification state;

fig. 6 is a field curvature distortion diagram of the zoom eyepiece of one embodiment of the present invention in a 31.25-fold state.

In the figure; 1-variable power group lens; 2-sliding sleeve screws; 3-a relay lens joint; 4-zoom handwheel; 5-an outer sealing ring of the image rotating lens joint; 6-variable-magnification rotation of the screw; 7-a first pressing ring of the image converter tube; 8-limiting screws of the zoom tube; 9-a second pressing ring of the image converter tube; 10-eyepiece lens; 11-a zoom tube pressing ring; 12-a zoom tube; 13-image rotating tube; 14-a compensation group lens; 15-zoom tube gasket; 16-field lens frame; 17-field lens clamping ring; 18-countersunk head screw; 19-eyepiece barrel; 20-a backstop ring; 21-eyepiece rubber sleeve; 22-eyepiece first lens; 23-an eyepiece second lens; 24-eyepiece third lens; 25-eyepiece fourth lens; 26-eyepiece first spacer ring; 27-eyepiece second spacer; 28-eyepiece clamping ring.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Referring to fig. 1 and 2, a zoom range of the zoom eyepiece is 8mm-25mm, which can realize a continuous zoom range of 10-31.25 times, and a zoom ratio is about 1; the eyepiece adopts a two-component continuous zoom system, which comprises a movable lens group, an eyepiece group, a zoom rotating screw, an eyepiece barrel and an inner sealing ring. The movable lens group comprises a zoom group lens 1 (the zoom group lens 1 comprises a zoom group first lens with negative focal power and a zoom group second lens with positive focal power), a compensation group lens 14 with positive focal power and a field lens with negative focal power, wherein a lens frame for fixing the zoom group lens 1 and the compensation group lens 14 is respectively connected with an image rotating tube 13 through a sliding sleeve screw 2, and when a zoom hand wheel 4 is rotated and the zoom hand wheel 4 drives a zoom tube 12 to rotate through a zoom rotating screw 6, the zoom group lens 1 and the compensation group lens 14 in the image rotating tube 13 are controlled by the sliding sleeve screw 2 to move axially according to the groove track of the zoom tube 12. The eyepiece group 10 comprises an eyepiece first lens 22 with positive focal power, an eyepiece second lens 23 with negative focal power, an eyepiece third lens 23 with positive focal power, an eyepiece fourth lens 25 with positive focal power, an eyepiece frame, an eyepiece first spacer ring 26, an eyepiece second spacer ring 27, an eyepiece pressing ring 28, an eyepiece rubber sleeve 21 and an eyepiece stopping ring 20. The eyepiece group lens 10 is fixed by an eyepiece frame, a spacer ring and a pressing ring, the eyepiece group lens 10 is driven to do axial rotation movement by rotating an eyepiece rubber sleeve 21 to adjust the visibility, and an eyepiece stopping ring 20 is used for limiting. The eyepiece barrel 19 is connected with the image rotating lens joint through threads, and further connected with the movable lens group and the eyepiece lens group 10.

When the variable power group lens 1 moves axially along the optical axis, the combined focal length of the system will change, the image of the variable power group lens 1 also moves, and in order to keep the image plane of the system still, the compensation group lens 14 is moved according to a certain rule while the variable power group lens 1 moves, so that the image point of the variable power group lens 1 is still at the original position after passing through the compensation group lens 14. The movement law of the compensation group lens 14 is non-linear and corresponds to the movement of the variable power group lens 1. The light rays are imaged on a second image surface through the image rotating lens group, and then are emitted in parallel through the eyepiece group lens 10 to form an image on a retina.

Further, the edge distance between the variable power group lens 1 and the compensation group lens 14 is larger than 4mm, so that the interference phenomenon between the two lens frames can be avoided in the moving process.

Furthermore, the maximum curve angle of the lens frames of the zoom group lens 1 and the compensation group lens 14 is 35.5 degrees, so that smooth movement and comfortable hand feeling are ensured in the zooming process.

Further, the field lens is fixed by a field lens frame 16 and a field lens pressing ring 17, and is used for reducing the total length of the system and enabling the structure to be compact.

Furthermore, the zoom tube limit screw 8 fixes the image rotation tube 13 and the image rotation lens joint 3, so that the image rotation tube 13 does not generate rotation error.

Furthermore, after the image rotating tube 13 moves axially to adjust the clear image surface, the first pressing ring 7 of the image rotating tube and the second pressing ring 9 of the steering tube are respectively fixed at two sides of the image rotating tube 13, so that the image rotating tube 13 does not generate axial movement errors, and the conjugate image surface in the moving lens group is stable. During assembly, the position of the image transfer tube can be determined by the first pressing ring 7 of the image transfer tube, and the image transfer tube 13 is finely adjusted to enable the image surface to be clear and then fixed by the second pressing ring 9 of the image transfer tube.

Furthermore, an image transfer lens joint outer sealing ring 5 is designed between the zooming hand wheel 4 and the image transfer lens joint 3 and used for sealing gas after nitrogen flushing and optimizing the rotating hand feeling of the zooming hand wheel 4.

Furthermore, a zoom tube gasket 15 is designed between the image rotating tube 13 and the zoom tube 12, so that the zoom hand wheel 4 rotates more smoothly, and the adopted copper gasket has a wear-resistant effect.

Further, the eyepiece frame is designed with an air guide hole which is matched with the countersunk head screw 18 to ensure the air tightness of the product after nitrogen flushing.

Further, the relay pipe 13 is designed with a zoom curve groove.

Furthermore, a hand wheel rubber sleeve is arranged outside the zooming hand wheel 4.

FIG. 3 is a dot-column diagram of the embodiment of the present invention in a 10-fold state, in which the root mean square radius is substantially within 50 μm and has reached the basic requirements of eyepiece design; FIG. 4 is a field curvature distortion diagram in the 10 times state of the embodiment of the present invention, the central field curvature and distortion are corrected well, the maximum distortion appears in the edge viewing field, the value is about 2.5%, and the maximum distortion requirement of the eyepiece is satisfied; FIG. 5 is a dot-column diagram of the embodiment of the present invention in a 31.25-fold state, in which the root mean square radius is substantially within 50 μm, and has reached the basic requirements of eyepiece design; FIG. 6 is a diagram of distortion of field curvature under 31.25 times of the state of the embodiment of the present invention, the central field curvature and distortion are well corrected, the maximum distortion appears in the peripheral field of view, the numerical value is about 2.5%, and the maximum distortion requirement of the eyepiece is satisfied.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. A zoom eyepiece, comprising: the image rotating lens joint is connected with an eyepiece sleeve through threads, an image rotating tube is arranged in the image rotating lens joint, and the image rotating tube is fixed in the image rotating lens joint through a first pressing ring of the image rotating tube and a second pressing ring of the image rotating tube; the image relay tube is internally provided with a zoom group lens fixed by a zoom group lens frame and a zoom group pressing ring, a compensation group lens fixed by a compensation group lens frame and a compensation group pressing ring and a field lens fixed by a field lens frame and a field lens pressing ring; the outside of the image rotating tube is sleeved with a zoom tube, the zoom tube is fixed with the image rotating tube through a zoom tube pressing ring, a track groove is arranged on the zoom tube, the zoom group picture frame and the compensation group picture frame are connected with the image rotating tube through sliding sleeve screws, and one end of each sliding sleeve screw is arranged in the track groove of the zoom tube; the image transfer lens joint is externally sleeved with a zooming hand wheel which is connected with the image transfer tube through a zooming rotating screw.

2. The variable power eyepiece of claim 1, wherein: the zoom tube is fixedly connected with the image rotating lens joint through a zoom tube limit screw.

3. The variable power eyepiece of claim 1, wherein: an image rotating lens joint outer sealing ring is arranged between the zooming hand wheel and the image rotating lens joint.

4. The variable power eyepiece of claim 1, wherein: the eyepiece sleeve is connected with an eyepiece group frame through threads, and an eyepiece group lens is arranged in the eyepiece group frame.

5. The variable power eyepiece of claim 4, wherein: an eyepiece rubber sleeve is sleeved outside one end of the eyepiece group lens.

6. The variable power eyepiece of claim 4, wherein: the eyepiece group lens in the eyepiece group picture frame includes the adjacent eyepiece first lens that has positive focal power and the eyepiece second lens that has negative focal power that sets up, still including the eyepiece fourth lens that has positive focal power eyepiece third lens and have positive focal power, be provided with the first spacer ring of eyepiece between eyepiece second lens and the eyepiece third lens, be provided with eyepiece second spacer ring between eyepiece third lens and the eyepiece fourth lens, eyepiece fourth lens one side is provided with and is used for the first eyepiece clamping ring to the fourth lens is fixed with the eyepiece.

7. The variable power eyepiece of claim 4, wherein: one end of the eyepiece group frame is provided with a countersunk head threaded hole, and a countersunk head screw is arranged in the countersunk head threaded hole.

8. The variable power eyepiece of claim 4, wherein: a backstop ring is arranged between the eyepiece barrel and the eyepiece group frame.

9. The variable power eyepiece of claim 1, wherein: the zoom tube is provided with a zoom tube gasket at the position of the contact surface of one end of the zoom tube close to the eyepiece sleeve and the image converter tube.

10. The variable power eyepiece of claim 1, wherein: the edge distance between the zoom group lens and the compensation group lens is more than 4mm.