CN217238383U

CN217238383U - Optical structure of laser ranging sensor

Info

Publication number: CN217238383U
Application number: CN202123310670.8U
Authority: CN
Inventors: 刘明
Original assignee: Shanghai Enbi Technology Co ltd
Current assignee: Shanghai Enbi Technology Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-08-19
Anticipated expiration: 2031-12-27

Abstract

The utility model relates to a laser rangefinder sensor's optical structure, including laser diode, this laser diode includes that base, cover locate the closing cap on this base, locate the crystalline grain in this closing cap and be fixed in the pin at this base back, and two luminous ends of this crystalline grain are for the lateral wall of this closing cap, and first light-emitting mouth and second light-emitting mouth relative with two luminous ends of this crystalline grain respectively are seted up to this closing cap both sides. The utility model provides an in the prior art phase place range finding structure in two laser diode be difficult to the technical problem who matches. The utility model discloses a laser diode replaces using two laser diode, at phase place method range finding in-process, can play better same frequency effect, and the temperature floats the characteristic also completely unanimous, has removed the temperature of two laser diode under the not good condition of material from and has floated the problem of matching the process difficulty, also can be more simultaneously save design space and cost.

Description

Optical structure of laser ranging sensor

Technical Field

The utility model relates to a laser rangefinder technical field especially relates to a laser rangefinder sensor's optical structure.

Background

The phase distance measurement widely corresponds to a handheld distance meter, an unmanned aerial vehicle distance measurement and a telescope distance meter, and as shown in fig. 2, the traditional phase distance measurement method adopts two laser diodes 1, one laser diode is emitted outwards through a lens and irradiates on an object to be measured and then is reflected to an Avalanche Photo Diode (APD)4, the other laser diode directly irradiates on the Avalanche Photo Diode (APD)4, and the measured distance is obtained by calculating the phase relation of response of the Avalanche Photo Diode (APD)4 after receiving two paths of laser light. However, the structure has poor same-frequency effect and incomplete temperature drift characteristics, and has the problems of certain mismatching risk and difficult performance matching in the temperature drift matching process of two laser diodes.

SUMMERY OF THE UTILITY MODEL

To the weak point that exists among the above-mentioned prior art, the utility model provides a laser rangefinder sensor's optical structure has solved among the prior art technical problem that two laser diode are difficult to match in the phase place range finding structure.

The utility model discloses an optical structure of laser rangefinder sensor, including laser diode, this laser diode includes that base, cover locate the closing cap on this base, locate the crystalline grain in this closing cap and be fixed in the pin at this base back, and two luminous ends of this crystalline grain are for the lateral wall at this closing cap, and first light-emitting mouth and second light-emitting mouth relative with two luminous ends of this crystalline grain respectively are seted up to this closing cap both sides.

The utility model discloses laser rangefinder sensor's optical structure further improves and lies in, and this optical structure still includes first lens, second lens and avalanche diode, and this first lens is just to this first light-emitting window, and this second lens is on a parallel with this first lens, and this avalanche diode is just to this second lens.

The utility model discloses laser rangefinder sensor's optical structure further improves and lies in, and the light-emitting direction of this crystalline grain is on a parallel with this base.

The utility model discloses laser rangefinder sensor's optical structure further improves and lies in, is equipped with first light path conversion module between this second lens and this avalanche diode.

The utility model discloses laser rangefinder sensor's optical structure further improves and lies in, and this optical structure still includes second light path conversion module, and this second light path conversion module is just to this second light-emitting window, and this second light path conversion module is on a parallel with this first light path conversion module.

The utility model discloses laser rangefinder sensor's optical structure further improves and lies in, and this optical structure still includes light intensity monitoring diode, and this light intensity monitoring diode is just to this second light path conversion module.

Compared with the prior art, the utility model, its effect is positive and obvious. The utility model discloses a parallel arrangement sends laser from both sides simultaneously at the inside crystal of laser diode, and has solved among the prior art technical problem that two laser diodes are difficult to match in the phase place range finding structure. The utility model discloses a laser diode replaces using two laser diode, at phase place method range finding in-process, can play better same frequency effect, and the temperature floats the characteristic also completely unanimous, has removed the temperature of two laser diode under the not good condition of material from and has floated the problem of matching the process difficulty, also can be more simultaneously save design space and cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal die of a laser diode in the prior art.

Fig. 2 is a schematic structural diagram of an optical structure of a laser ranging sensor in the prior art.

Fig. 3 is a schematic diagram of the laser diode internal crystal grain of the optical structure of the laser ranging sensor according to the present invention.

Fig. 4 is a schematic diagram of the overall structure of the optical structure of the laser distance measuring sensor of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, as shown in fig. 3 and fig. 4, the utility model provides an optical structure of laser ranging sensor, including laser diode 1, this laser diode 1 includes base 8, cover and locates the closing cap 9 on this base 8, locate the crystalline grain 11 in this closing cap 9 and be fixed in the pin 10 at this base 8 back, and two luminous ends of this crystalline grain 11 are for the lateral wall of this closing cap 9, and first light-emitting window and second light-emitting window relative with two luminous ends of this crystalline grain 11 respectively have been seted up to this closing cap 9 both sides. As shown in fig. 1 and 2, the light emitting direction of the crystal grain inside the laser diode 1 sealing cover in the prior art is perpendicular to the base and only can emit a laser beam forward, as shown in fig. 3, the crystal grain in the laser diode 1 in the structure is rotated by 90 degrees compared with the traditional crystal grain arrangement form, the vertical crystal fixing form is changed into horizontal crystal fixing and bidirectional light emitting, two laser beams can be emitted simultaneously during operation, and two laser diodes 1 do not need to be provided to emit two laser beams, so that the temperature drift matching process and risk of the two laser diodes 1 are avoided, and the problem of difficult performance matching when the material of the laser diode 1 is not good. In the working and running process, the avalanche diode 4 receives the phase relation of the two laser responses, and then the measured distance is obtained.

Preferably, as shown in fig. 4, the optical structure further includes a first lens 2, a second lens 3, and an avalanche diode 4, the first lens 2 is opposite to the first light outlet, the second lens 3 is parallel to the first lens 2, and the avalanche diode 4 is opposite to the second lens 3. After laser emitted by the first light emitting end of the laser diode 1 passes through the first light outlet and the first lens 2 and irradiates on an object to be measured, the object to be measured reflects the laser and irradiates on the avalanche diode 4 after passing through the second lens 3, and laser emitted by the second light emitting end of the laser diode 1 directly irradiates on the avalanche diode 4. The laser is scattered when the laser is reflected by the object to be measured, so that the reflected laser is more dispersed, and the second lens 3 converges the reflected laser and irradiates the laser onto the avalanche diode 4, so as to increase the amount of the laser which is reflected and irradiates the avalanche diode 4, thereby improving the ranging accuracy. The first lens 2 and the second lens 3 are both condenser lenses.

Specifically, as shown in fig. 3 and 4, the light emitting direction of the die 11 is parallel to the base 8, so that the die 11 emits laser light parallel to the base 8 to two sides of the cap, and the arrangement and distribution of the components are facilitated.

Preferably, a first light path conversion module 5 is disposed between the second lens 3 and the avalanche diode 4. The laser reflected by the object to be measured passes through the second lens 3, then passes through the first optical path conversion module 5, and finally irradiates on the avalanche diode 4. The first optical path conversion module 5 converts the laser light passing through the second lens 3 into light suitable for the avalanche diode 4 to receive.

Preferably, the optical structure further includes a second optical path conversion module 6, the second optical path conversion module 6 faces the second light outlet, and the second optical path conversion module 6 is parallel to the first optical path conversion module 5. The laser emitted from the second side of the laser diode 1 passes through the second optical path conversion module 6 and the first optical path conversion module 5 in sequence to irradiate on the avalanche diode 4. The second optical path conversion module 6 converts the laser emitted from the second side into light suitable for the avalanche diode 4 to receive, and the first optical path conversion module 5 and the second optical path conversion module 6 change the direction of the laser. In this embodiment, the first optical path conversion module 5 and the second optical path conversion module 6 are half mirrors, so that half of the laser light passes through the mirror surface and half of the laser light is reflected to change the direction.

Preferably, the optical structure further comprises a light intensity monitoring diode 7, and the light intensity monitoring diode 7 is opposite to the second light path conversion module 6. The second optical path conversion module 6 irradiates a part of the laser light onto the light intensity monitoring diode 7. The light intensity monitor diode 7 is used to monitor the light emitting state of the laser diode 1. In this embodiment, the light intensity monitor diode 7 is a photodiode.

The utility model discloses a parallel arrangement sends laser from both sides simultaneously at the inside crystal of laser diode, and has solved among the prior art technical problem that two laser diodes are difficult to match in the phase place range finding structure. The utility model discloses a laser diode replaces using two laser diode, at phase place method range finding in-process, can play better with the frequency effect, and the temperature floats the characteristic also completely unanimous, has removed the temperature of two laser diode under the not good condition of material from and has floated the problem of matching the process difficulty, also can be more simultaneously saves design space and cost.

The utility model discloses in not relate to the part all the same with prior art or can adopt prior art to realize. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above embodiments, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention still fall within the scope of the present invention.

Claims

1. An optical structure of a laser ranging sensor, characterized in that: the LED chip comprises a laser diode, wherein the laser diode comprises a base, a sealing cover covered on the base, a crystal grain arranged in the sealing cover and a pin fixed on the back surface of the base, two light-emitting ends of the crystal grain are opposite to the side wall of the sealing cover, and a first light outlet and a second light outlet which are respectively opposite to the two light-emitting ends of the crystal grain are formed in the two sides of the sealing cover.

2. The optical structure of the laser range sensor of claim 1, further comprising a first lens, a second lens, and an avalanche diode, wherein the first lens is opposite to the first light outlet, the second lens is parallel to the first lens, and the avalanche diode is opposite to the second lens.

3. The optical structure of the laser ranging sensor as claimed in claim 1, wherein the light emitting direction of the die is parallel to the base.

4. The optical structure of the laser ranging sensor as claimed in claim 2, wherein a first light path conversion module is disposed between the second lens and the avalanche diode.

5. The optical structure of the laser ranging sensor as claimed in claim 4, further comprising a second optical path conversion module, wherein the second optical path conversion module is opposite to the second light outlet, and the second optical path conversion module is parallel to the first optical path conversion module.

6. The optical structure of the laser ranging sensor as claimed in claim 5, further comprising a light intensity monitoring diode facing the second light path conversion module.