CN120065174A

CN120065174A - A laser rangefinder

Info

Publication number: CN120065174A
Application number: CN202510194004.6A
Authority: CN
Inventors: 崔金林; 刘俊; 陈永泽
Original assignee: Shenzhen Hengtian Weiyan Technology Co ltd
Current assignee: Shenzhen Hengtian Weiyan Technology Co ltd
Priority date: 2025-02-21
Filing date: 2025-02-21
Publication date: 2025-05-30

Abstract

The present invention relates to a laser rangefinder, comprising a visual system, a transmitting system and a receiving system; the visual system comprises an objective lens, a first prism and an eyepiece which are arranged in sequence from the object side to the image side; the transmitting system comprises a laser, a first cemented lens, the first prism and the objective lens; the laser and the first cemented lens are located on one side of the visual system, and the laser light emitted from the laser is reflected to the first prism via the first cemented lens, and is emitted from the objective lens to a target object after being reflected by the first prism; the receiving system is used for receiving the laser light reflected from the target object. By means of the above method, independent parts can be reduced and integration can be achieved, so that the assembly and adjustment steps can be simplified, the assembly and adjustment errors can be reduced, and there is no need for a reflector to fold an optical path, which is conducive to reducing costs.

Description

Laser range finder

Technical Field

The invention relates to the technical field of laser ranging, in particular to a laser range finder.

Background

The handheld laser range finder has small volume and light weight, can be placed in a pocket, can be carried to any place easily for measurement, and is a very practical tool in the scenes of outdoor, construction sites and the like where frequent measurement is required. However, the existing hand-held laser range finder has a complex structure, the internal optical parts are generally arranged in an independent and scattered way, so that the steps of assembling and adjusting are more, the assembling and adjusting error is large, in order to shorten the length of the instrument, a reflecting mirror is generally adopted in a transmitting system to fold a light path, and the cost of the reflecting mirror is higher, so that the cost is not beneficial to reduction.

Disclosure of Invention

Based on the above, it is necessary to provide a laser range finder, which can reduce independent parts and realize integration, so that the adjustment steps can be simplified, the adjustment errors can be reduced, and the reflector is not required to fold the light path, thereby being beneficial to reducing the cost.

In a first aspect, the present invention provides a laser rangefinder comprising a vision system, a transmitting system, and a receiving system;

The visual system comprises an objective lens, a first prism and an eyepiece which are sequentially arranged from an object side to an image side;

The system comprises an emission system, a visual system and a target object, wherein the emission system comprises a laser, a first gluing mirror, a first prism and an objective lens, the first gluing mirror and the first prism are fixed, the laser and the first gluing mirror are positioned at one side of the visual system, laser emitted from the laser is reflected to the first prism through the first gluing mirror, and is emitted to the target object from the objective lens after being reflected by the first prism;

the receiving system is used for receiving the laser reflected from the target object.

Further, the first gluing mirror comprises a lens A and a prism A which are fixed in a gluing way, and laser emitted by the laser enters the prism A after passing through the lens A and is reflected to the first prism through the prism A.

Further, the first gluing mirror is located at one side of the first prism, and the prism A and the first prism are glued and fixed, so that the first gluing mirror and the first prism form a gluing mirror group.

Further, the receiving system comprises a second gluing mirror and a detector, wherein the detector is positioned on one side of the second gluing mirror, and laser light reflected from the target enters the second gluing mirror and is reflected to the detector through the second gluing mirror.

Further, the second gluing mirror comprises a lens B and a prism B which are fixed in a gluing way, and laser reflected from the target object enters the prism B after passing through the lens B and is reflected to the detector through the prism B.

Further, the detector is fixed on the prism B.

Further, the receiving system further comprises a first lens, the first lens is located on one side of the lens B, which faces away from the prism B, and laser reflected from the target object passes through the first lens and then enters the lens B.

Further, the first lens is glued and fixed with the lens B.

Further, a display screen is arranged between the first prism and the ocular, and the display screen is positioned at the object focus of the ocular.

Further, the first prism is an image transfer prism.

The laser range finder comprises a visual system, a transmitting system and a receiving system, wherein the visual system comprises an objective lens, a first prism and an eyepiece which are sequentially arranged from an object side to an image side, the transmitting system comprises a laser, a first gluing mirror, the first prism and the objective lens, the laser and the first gluing mirror are positioned on one side of the visual system, laser emitted from the laser is reflected to the first prism through the first gluing mirror and is reflected by the first prism and then emitted from the objective lens to a target object, and the receiving system is used for receiving the laser reflected back from the target object.

Drawings

Fig. 1 is a schematic structural diagram of a laser range finder provided by the invention;

fig. 2 is a schematic structural diagram of a first prism according to the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In describing embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the product of the application is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

The laser range finder provided by the embodiment of the invention can be a handheld laser range finder and can also be applied to equipment such as gun sighting telescope, binoculars, holographic helmets, glasses and the like.

Referring to fig. 1, in a laser range finder 100 according to an embodiment of the present invention, the laser range finder 100 includes a visual system 11, a transmitting system 12 and a receiving system 13.

The visual system 11 includes an objective lens 111, a first prism 112, and an eyepiece 113, which are disposed in this order from an object side to an image side. The objective lens 111, the first prism 112 and the eyepiece 113 constitute a telescope for observing an object, and external ambient light enters from the objective lens 111 and then passes through the first prism 112 and the eyepiece 113, and an observer observes through the eyepiece 113. Further, a display screen 114 is further disposed between the first prism 112 and the eyepiece 113, and the display screen 114 is located at an object focal point of the eyepiece 113 and is used for displaying measurement data and other electronic information, such as a residual electric quantity. The display 114 may be an Organic Light Emitting Diode (OLED), a liquid crystal display, or other type of display, without limitation. Wherein the objective lens 111, the first prism 112, the display screen 114 and the eyepiece 113 are coaxially disposed. The eyepiece 113 may be a transparent resin lens or an optical glass lens.

The emission system 12 comprises a laser 121, a first glue lens 122, the aforementioned first prism 112 and an objective lens 111. The first gluing mirror 122 and the first prism 112 are fixed, the laser 121 and the first gluing mirror 122 are located at one side of the visual system 11, for example, based on the view of fig. 1, the laser 121 and the first gluing mirror 122 are located at the lower side of the eyepiece system 11, and the laser light emitted from the laser 121 is reflected upward to the first prism 112 via the first gluing mirror 122, reflected by the first prism 112, and then emitted from the objective lens 111 onto the target object.

The receiving system 13 is used to receive the laser light reflected from the target object to achieve distance measurement.

In the present invention, the first gluing mirror 122 is used to reflect the emitted laser to the first prism 112, so as to realize the folding of the optical path, which is beneficial to shortening the length of the instrument and reducing the cost compared with the reflecting mirror, meanwhile, the first gluing mirror 122 is of a gluing mirror structure, the gluing mirror means that two or more different glass or crystal sheets are bonded together through glue to form an integral optical device, compared with the independent part mode, the first gluing mirror 122 can realize integration, and the number of the independent parts is reduced, so that the adjustment elements can be reduced, the adjustment steps are simplified, and the adjustment error is reduced.

The first prism 112 may be an image conversion prism having a light splitting function, and the image conversion prism may convert an inverted image into an upright image, thereby allowing an observer to directly see the upright image without adjusting a viewing angle. Further, as shown in fig. 2, a reflective film F1 that reflects laser light and transmits visible light is plated inside the first prism 112, and the ambient light is visible light, and the wavelength bands of the visible light and the laser light are different, so that the reflective film F1 may be disposed according to the wavelength bands of the visible light and the laser light, so that the reflective film F1 can reflect the laser light and transmit the visible light, thereby enabling the first prism 112 to have a light splitting function. Thus, the first prism 112 transmits external ambient light when it is the component of the vision system 11, and reflects laser light when it is the component of the emission system 12.

The laser 121 may be a semiconductor laser, which is a device that converts electrical energy into laser light energy. The laser emitted by the semiconductor laser has narrow spectrum, high frequency stability, high power and long service life. Semiconductor lasers mainly include diode lasers and vertical cavity surface emitting lasers. In other embodiments, the laser 121 may be other types of lasers, such as a solid-state laser or a light-ray laser, where the fixed laser is a laser using a solid material as a resonant cavity, and has the characteristics of excellent optical performance, large tunable range, good beam quality, high power, and strong stability and reliability, and the fiber laser is a laser using an optical fiber as a working substance, and has the characteristics of high output power, good beam quality, stable frequency, and the like.

Further, the first glue lens 122 includes a lens a1221 and a prism a1222 fixed by glue, wherein the lens a1221 and the prism a1222 may be fixed by UV (Ultra Violet) glue or AB glue (i.e. a two-component epoxy AB glue adhesive). Lens a1221 is located between the laser 121 and the prism a 1222. As shown in fig. 1, lens a1221 may be a plano-convex lens, with the side facing the laser 121 being convex and the side glued to the prism a1222 being planar, although in other embodiments, lens a1221 may be other types of lenses. The prism a1222 plays a role of a reflection light path, and the laser light emitted from the laser 121 enters the prism a1222 after passing through the lens a1221, is reflected upward to the first prism 112 via the prism a1222, is reflected to the objective lens 111 by the first prism 112, and is emitted from the objective lens 111.

Optionally, the first glue lens 122 is located on one side of the first prism 112, such as on the lower side of the first prism 112, and the prism a1222 and the first prism 112 are glued and fixed, and both may be glued and fixed by UV glue or AB glue. The first gluing mirror 122 and the objective lens 111 form a laser collimating lens group, the first gluing mirror 122 and the first prism 112 form a gluing lens group, and the laser 121 emits laser light, and the laser light is collimated and emitted after passing through the gluing lens group and the objective lens 111, so that the emission system 12 does not need to use a plane mirror to fold an optical path, which is beneficial to reducing the cost, and the integrated design can be further realized.

The receiving system 13 includes a second gluing mirror 131 and a detector 132, the detector 132 is located at one side of the second gluing mirror 131, for example, based on the view of fig. 1, the detector 132 is located at the lower side of the second gluing mirror 131, and the laser light reflected from the target enters the second gluing mirror 131 and is reflected downward onto the detector 132 through the second gluing mirror 131. The detector 132 receives the reflected laser light through the second bonding mirror 131 and converts the reflected laser light into an electrical signal, and the detector 132 may be a photodiode, such as an Avalanche Photodiode (APD), which is a P-N junction type photo detection diode, wherein the avalanche multiplication effect of carriers is utilized to amplify the photo signal to improve the detection sensitivity, and after a reverse bias voltage is applied to the P-N junction of the photodiode made of silicon or germanium, the incident laser light is absorbed by the P-N junction to form a photocurrent, and the phenomenon that the avalanche is generated (i.e., the photocurrent is doubly increased) is increased by increasing the reverse bias voltage.

The laser range finder 100 further comprises a range finding module and a power module, wherein the power module provides power for the range finding module, the display screen 114, the laser 121, the detector 132 and other devices, the power module can comprise a rechargeable battery, and the rechargeable battery is connected with an external power supply through a charging port, so that charging of the rechargeable battery can be achieved. The distance measuring module calculates the distance between the target object and the laser distance measuring instrument 100 according to the time from the emission to the reception of the laser and the combination of the light speed. The ranging module is also connected to the display 114 for sending the measurement data to the display 114 for display.

Optionally, the laser rangefinder 100 may further include a voice broadcast module, where the ranging module is connected with the voice broadcast module, and after calculating the distance between the target object and the laser rangefinder 100, the voice broadcast module plays the voice information of the measurement data, so as to broadcast the measurement data in a voice manner, so that the use of observers is facilitated. In addition, a volume button can be further arranged, and the size of the voice can be adjusted through the volume button. In addition, the laser rangefinder 100 may further include a temperature and humidity sensor for collecting ambient temperature and humidity, and sending collected data to the display 114 for display, or sending data to the voice broadcast module for voice playing, so that when a user performs measurement outdoors, the user can know the temperature and humidity of the surrounding environment.

Further, the second gluing mirror 131 includes a lens B1311 and a prism B1312, which are glued and fixed, and the laser light reflected from the target enters the prism B1312 after passing through the lens B1311, and is reflected onto the detector 132 by the prism B1312, so that the prism B1312 reflects the received laser light, and plays a role of folding the optical path. The lens B1311 may be a plano-convex lens or other lens, and when the lens B1311 is a plano-convex lens, the surface of the lens B1311 that is attached to the prism B1312 is a plane, and the other surface on which laser light is incident is a convex surface.

The prism B1312 is a beam-splitting prism, and a reflective film (oblique lines inside the prism B1312) is coated inside the prism B1312, and the reflective film can reflect laser light and transmit ambient light, so that the laser light reflected by the target object can be reflected to the detector 132.

Alternatively, the detector 132 is fixed to the prism B1312, for example, the surface of the detector 132 is attached to the prism B1312 by means of adhesion or the like.

Optionally, the receiving system 13 further includes a first lens 133, where the first lens 133 is located on a side of the lens B1311 facing away from the prism B1312, and the laser light reflected from the target object passes through the first lens 133 and enters the lens B1311. Wherein the first lens 133 may be cemented with the lens B1311. The laser light of the echo is focused on the photosurface of the detector 132 after passing through the first lens 133 and the second bonding mirror 131.

Therefore, the receiving system 13 of the invention realizes the design of a folded light path for the limited length requirement without using a reflecting mirror, and greatly improves the performance of the receiving system.

In the invention, under the condition that a reflector is not needed, the first gluing mirror 122 is utilized to realize the folding of the transmitting light path, and the second gluing mirror 131 is utilized to realize the folding of the receiving light path, so that the length can be shortened, the cost can be reduced, and the number of independent parts can be reduced by gluing and fixing the first gluing mirror 122 with the first prism 112 and fixing the second gluing mirror 131 with the detector 132, so that the integration is further realized, the assembly process is simplified, and the assembly error is reduced.

Optionally, the laser rangefinder 100 may further include a communication module, through which the ranging module may be communicatively connected to the terminal device, so as to send measurement data to the terminal device for viewing by an observer. The communication module can be a wireless communication module or a USB or Type-C communication module, namely, the ranging module can be in wireless connection with the terminal equipment through the wireless communication module, and can be in wired connection with the terminal equipment through a USB data line or a Type-C data line. The wireless communication module may be, for example, a bluetooth module, a WIFI module, or an NFC module, and the terminal device may be, for example, a tablet, a mobile phone, or a computer.

Optionally, the laser rangefinder 100 may further include an illumination lamp, and by setting an illumination switch to control the illumination lamp to be turned on and off, a flashlight function may be realized, so as to facilitate illumination in the dark or in a dark environment.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. The laser range finder is characterized by comprising a visual system, a transmitting system and a receiving system;

2. The laser range finder of claim 1, wherein the first glue mirror includes a lens a and a prism a fixed by glue, and the laser light emitted from the laser enters the prism a after passing through the lens a, and is reflected to the first prism via the prism a.

3. The laser rangefinder of claim 2 wherein the first glue lens is located on one side of the first prism, the prism a and the first prism being fixed by gluing such that the first glue lens and first prism form a glue lens set.

4. The laser rangefinder of claim 1 wherein the receiving system comprises a second glue mirror and a detector located on one side of the second glue mirror, the laser light reflected back from the target entering the second glue mirror and being reflected via the second glue mirror onto the detector.

5. The laser range finder of claim 4, wherein the second glue mirror includes a lens B and a prism B, and the laser light reflected from the target passes through the lens B and then enters the prism B, and is reflected onto the detector via the prism B.

6. The laser rangefinder of claim 5 wherein the detector is fixed to prism B.

7. The laser range finder of claim 4, wherein the receiving system further comprises a first lens, the first lens being located on a side of the lens B facing away from the prism B, and the laser light reflected from the target passing through the first lens and entering the lens B.

8. The laser rangefinder of claim 7 wherein the first lens is cemented with the lens B.

9. The laser rangefinder of claim 1 further comprising a display screen disposed between the first prism and the eyepiece, the display screen being positioned at an object focus of the eyepiece.

10. The laser rangefinder of claim 1 wherein the first prism is an image transfer prism.