CN216118022U

CN216118022U - Handheld laser range finder with stray light eliminating structure

Info

Publication number: CN216118022U
Application number: CN202122538177.5U
Authority: CN
Inventors: 张明
Original assignee: Zhongshan Mavinlens Optical Co Ltd
Current assignee: Zhongshan Mavinlens Optical Co Ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-03-22
Anticipated expiration: 2031-10-21

Abstract

The utility model discloses a handheld laser range finder with a stray light eliminating structure, which comprises a transmitting lens barrel (1), a transmitting lens (2), a receiving lens barrel (3) and a receiving lens (4), wherein the transmitting lens (2) is arranged at the upper part of the front end of the transmitting lens barrel (1), the receiving lens (4) is arranged at the front end of the receiving lens barrel (3), the transmitting lens barrel (1) is positioned above the receiving lens barrel (3), axial extinction grains (5) and annular extinction grains (6) are arranged on the inner wall of the receiving lens barrel (3) behind the receiving lens (4), and the receiving lens (4), the axial extinction grains (5) and the annular extinction grains (6) are sequentially distributed along an optical axis L. The optical receiver can effectively eliminate stray light entering the receiving lens barrel, and improves sensitivity and reliability of light sensing.

Description

Handheld laser range finder with stray light eliminating structure

Technical Field

The utility model belongs to the technical field of handheld laser range finding, and particularly relates to a handheld laser range finder with a stray light eliminating structure.

Background

In the present handheld laser range finder, generally, the handheld laser range finder includes an emission lens barrel a1, an emission lens a2, a receiving lens barrel a3 and a receiving lens a4, the emission lens a2 is installed at the front end of the emission lens barrel a1, the receiving lens a4 is installed at the front end of the receiving lens barrel a3, and the emission lens barrel a1 is located at one side of the receiving lens barrel a3, as shown in fig. 1 and fig. 2, in order to make the receiving lens barrel a3 reduce interference to stray light and improve sensitivity and reliability of light sensing, an annular extinction stripe a5 is generally arranged on the inner wall of the receiving lens barrel a3 behind the receiving lens a4 to eliminate the influence of stray light.

Experimental researches show that the defects exist, namely, firstly), only annular extinction lines exist, no axial extinction lines exist, and most stray light cannot be effectively eliminated; the outer contour of the second) receiving lens a4 is a round lens, which is relatively easy to be made into a structure for eliminating stray light, when the outer deformation of the product is small, the two sides of the round lens need to be trimmed to form a special-shaped structure, and the original structure for eliminating stray light cannot achieve the effect of elimination.

Disclosure of Invention

The utility model aims to provide a handheld laser range finder with a stray light eliminating structure, which can effectively eliminate stray light entering a receiving lens cone and improve sensitivity and reliability of light sensing.

The technical scheme of the utility model is realized as follows:

the utility model aims to provide a handheld laser range finder with a stray light eliminating structure, which comprises a transmitting lens barrel, a transmitting lens, a receiving lens barrel and a receiving lens, wherein the transmitting lens is arranged at the upper part of the front end of the transmitting lens barrel, the receiving lens is arranged at the front end of the receiving lens barrel, the transmitting lens barrel is positioned above the receiving lens barrel, and the handheld laser range finder is characterized in that: the inner wall of the receiving lens barrel behind the receiving lens is provided with axial extinction grains and annular extinction grains, and the receiving lens, the axial extinction grains and the annular extinction grains are sequentially distributed along the optical axis L.

Foretell receiving lens is special-shaped lens, including plane and top cambered surface and the bottom cambered surface of both sides parallel layout, receiving lens cone is including the lens installation department that is located the front end and the circular cone sleeve that is located the afterbody, and lens installation department both sides set up parallel layout's flat lateral wall and top arc wall and bottom arc wall respectively, and the plane laminating is at receiving lens cone's flat lateral wall, and top cambered surface and top arc wall cooperate, and the bottom cambered surface cooperates with bottom arc wall.

The axial extinction threads are arranged on the flat side wall of the receiving lens cone.

The annular extinction lines are arranged on the inner portions of the conical sleeve, the top arc-shaped wall face and the bottom arc-shaped wall face.

The axial extinction lines and the annular extinction lines are arranged vertically, and the axial extinction lines are parallel to the optical axis L.

The axial extinction grains and the circumferential extinction grains form an intersection part.

The annular extinction lines are arranged in a step mode along the optical axis L.

The axial extinction lines are formed by a plurality of sawtooth-shaped convex strips distributed in the flat-plate-shaped side wall.

The length of the raised lines of a plurality of saw-toothed shapes in the middle is longer, and the length of the raised lines towards the two sides is gradually reduced.

Compared with the prior art, the utility model has the following advantages:

1. the utility model provides a handheld laser range finder with a stray light eliminating structure, which comprises a transmitting lens barrel, a transmitting lens, a receiving lens barrel and a receiving lens, wherein axial extinction grains and annular extinction grains are arranged on the inner wall of the receiving lens barrel behind the receiving lens, the axial extinction grains and the annular extinction grains are sequentially distributed along an optical axis L, stray light entering the receiving lens barrel is effectively eliminated by arranging the axial extinction grains and the annular extinction grains, and the sensitivity and the reliability of light sensing are improved.

2. Other advantages of the present invention are described in detail in the examples section of this specification.

Drawings

FIG. 1 is a schematic perspective view of a prior art hand-held laser rangefinder;

FIG. 2 is a cross-sectional view of a prior art hand-held laser rangefinder configuration;

FIG. 3 is an exploded perspective view of the present invention;

FIG. 4 is a perspective view of a receiver lens of the present invention;

FIG. 5 is a structural cross-sectional view in cross-section of the present invention;

FIG. 6 is a cross-sectional view of the receiving barrel of the present invention, partially broken away;

FIG. 7 is a cross-sectional view of the present invention with the transmitting and receiving lenses removed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 3 to 7, the present embodiment provides a handheld laser range finder with stray light eliminating structure, which includes a transmitting lens barrel 1, a transmitting lens 2, a receiving lens barrel 3 and a receiving lens 4, wherein the transmitting lens 2 is installed at the front end of the transmitting lens barrel 1, the receiving lens 4 is installed at the front end of the receiving lens barrel 3, the transmitting lens barrel 1 is located at one side of the receiving lens barrel 3, and the handheld laser range finder is characterized in that: the inner wall of the receiving lens barrel 3 behind the receiving lens 4 is provided with axial extinction grains 5 and annular extinction grains 6, and the receiving lens 4, the axial extinction grains 5 and the annular extinction grains 6 are sequentially distributed along the optical axis L.

According to the utility model, the axial extinction lines 5 and the annular extinction lines 6 are arranged, so that stray light entering the receiving lens barrel is effectively eliminated, and the sensitivity and reliability of light sensing are improved.

The receiving lens 4 is a special-shaped lens, and includes a plane 41, a top arc surface 42 and a bottom arc surface 43, which are arranged in parallel at two sides, the receiving lens barrel 3 includes a lens mounting portion 30a located at the front end and a conical sleeve 30b located at the tail end, a flat-plate-shaped side wall 31, a top arc wall 32 and a bottom arc wall 33 are respectively arranged at two sides of the lens mounting portion 30a, the plane 41 is attached to the flat-plate-shaped side wall 31 of the receiving lens barrel 3, the top arc surface 42 is matched with the top arc wall 32, and the bottom arc surface 43 is matched with the bottom arc wall 33. By adopting the special-shaped lens, the optical performance of the receiving lens barrel 3 is further improved, stray light is effectively eliminated, and the sensitivity and reliability of light sensing are improved. Through experimental tests, the stray light eliminating structure corresponding to the special-shaped lens can basically achieve the effect of the original stray light eliminating structure of the round lens.

The above-mentioned axial extinction threads 5 are provided on the flat side wall 31 of the receiving barrel 3. Simple and reasonable structure and easy manufacture.

The annular extinction lines 6 are arranged inside the conical sleeve 30b, the top arc-shaped wall surface 32 and the bottom arc-shaped wall surface 33, and the annular extinction line structure is simple in structure, reasonable in layout and easy to manufacture.

The axial extinction lines 5 and the annular extinction lines 6 are in vertical layout, and the axial extinction lines 5 are parallel to the optical axis L, so that stray light can be eliminated more effectively, and sensitivity and reliability of light sensing are improved.

The axial extinction lines 5 and the annular extinction lines 6 form an intersection part B, so that stray light can be eliminated more effectively, and sensitivity and reliability of light sensing are improved.

The annular extinction lines 6 are arranged in a step mode along the optical axis L, and the annular extinction lines are simple in structure and easy to manufacture.

The axial extinction threads 5 are formed by a plurality of saw-tooth-shaped convex strips 51 distributed in the flat side wall 31, and have simple structure and easy manufacture.

The length that the sand grip 51 of foretell a plurality of cockscomb structure is located in the middle is longer, and the length of sand grip 51 toward both sides reduces gradually, and is rationally distributed, can more effectively eliminate the veiling glare, promotes the sensitivity and the reliability of sensitization.

It should be noted that all the directional indications in the embodiments of the present invention, such as "up", "down", "front", "back", "left" and "right", are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above embodiments are only preferred embodiments of the present invention, but the present invention is not limited thereto, and any other changes, modifications, substitutions, combinations, simplifications, which are made without departing from the spirit and principle of the present invention, are all equivalent replacements within the protection scope of the present invention.

Claims

1. The utility model provides a take handheld laser range finder of stray light structure that disappears, includes transmitting lens cone (1), transmitting lens piece (2), receiving lens cone (3) and receiving lens piece (4), and the front end at transmitting lens cone (1) is installed in transmitting lens piece (2), and the front end at receiving lens cone (3) is installed in receiving lens piece (4), and transmitting lens cone (1) is located one side of receiving lens cone (3), its characterized in that: the inner wall of the receiving lens barrel (3) behind the receiving lens (4) is provided with axial extinction grains (5) and annular extinction grains (6), and the receiving lens (4), the axial extinction grains (5) and the annular extinction grains (6) are sequentially distributed along the optical axis L.

2. The handheld laser range finder with parasitic light elimination structure of claim 1, wherein: receiving lens (4) are special-shaped lens, plane (41) and top cambered surface (42) and bottom cambered surface (43) including the parallel overall arrangement of both sides, receiving lens cone (3) are including lens installation department (30a) that are located the front end and conical sleeve (30b) that are located the afterbody, lens installation department (30a) both sides set up flat-plate lateral wall (31) and top arc wall (32) and bottom arc wall (33) of parallel overall arrangement respectively, plane (41) laminating is at flat-plate lateral wall (31) of receiving lens cone (3), top cambered surface (42) and top arc wall (32) cooperation, bottom cambered surface (43) and bottom arc wall (33) cooperation.

3. The handheld laser range finder with parasitic light elimination structure of claim 2, wherein: the axial extinction threads (5) are arranged on a flat side wall (31) of the receiving barrel (3).

4. The handheld laser range finder with parasitic light elimination structure of claim 3, wherein: the annular extinction lines (6) are arranged on the inner parts of the conical sleeve (30b), the top arc-shaped wall surface (32) and the bottom arc-shaped wall surface (33).

5. The hand-held laser range finder with stray light eliminating structure as claimed in claim 1 or 2 or 3 or 4, wherein: the axial extinction lines (5) and the circumferential extinction lines (6) are vertically arranged, and the axial extinction lines (5) are parallel to the optical axis L.

6. The hand-held laser range finder with stray light eliminating structure as claimed in claim 1 or 2 or 3 or 4, wherein: the axial extinction lines (5) and the circumferential extinction lines (6) form an intersection part (B).

7. The handheld laser range finder with parasitic light elimination structure of claim 6, wherein: the annular extinction lines (6) are arranged in a step mode along the optical axis L.

8. The handheld laser range finder with parasitic light elimination structure of claim 2, wherein: the axial extinction threads (5) are formed by a plurality of sawtooth-shaped convex strips (51) distributed in the flat side wall (31).

9. The handheld laser range finder with parasitic light elimination structure of claim 8, wherein: the length of the plurality of saw-toothed convex strips (51) in the middle is longer, and the length of the convex strips (51) towards the two sides is gradually reduced.