CN210464394U

CN210464394U - Structured light generation light source device

Info

Publication number: CN210464394U
Application number: CN201921860401.9U
Authority: CN
Inventors: 张炜
Original assignee: Guangzhou Dawan District Virtual Reality Research Institute
Current assignee: Guangzhou Dawan District Virtual Reality Research Institute
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-05-05
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a structured light produces light source device, including light source (2) and shell (8), follow light source (2) irradiation direction is equipped with light source collecting lens (3), diffusion piece (4), grating (5), projecting lens (6) and protective cover board (7) in shell (8) in proper order, just light source (2), light source collecting lens (3), diffusion piece (4), grating (5) and projecting lens (6) constitute the light path system, and this light path system locates in shell (8), the structured light that light source (2) sent exports and the grating corresponds behind this light path system. In the device of the utility model, the light source adopts an RGB three-color LED module or an RGB three-color laser module, and can selectively output light with different colors; the projection lens adopts an object space telecentric lens, can be focused clearly at each position on a three-dimensional object to be measured, does not generate virtual focus, and has sharper projection picture and high measurement precision.

Description

Structured light generation light source device

Technical Field

The utility model belongs to the technical field of machine vision detects, more specifically relates to a structured light generates light source device.

Background

In the field of machine vision detection, particularly in the field of non-contact three-dimensional profile measurement, light with a specific structure is projected onto the surface of a three-dimensional object, images of a plurality of frames of objects are collected through a CCD, and the rapid reconstruction of the profile of the three-dimensional object can be realized by adopting a specific software algorithm.

At present, the main means for implementing structured light projection is to use digital projection technology, including dlp (digital light processing) projection, lcos (liquid Crystal on silicon) projection, lcd (liquid Crystal display) projection, and the like, and a common projection device is a commercial projector. The digital projector is large in volume and is not suitable for mobile and handheld three-dimensional measuring equipment, such as a handheld oral cavity scanner and the like.

Based on the above drawbacks and deficiencies, there is a need in the art for further improvements and designs of existing light-forming projection devices that reduce the size, power consumption, and hardware cost of the projection devices.

Disclosure of Invention

Aiming at the defects or the improvement requirements of the prior art, the utility model provides a structured light generation light source device, wherein the light source adopts an RGB three-color LED module or an RGB three-color laser module, and can selectively output light with different colors; by adopting the object space telecentric lens, clear focusing can be realized at each position on the three-dimensional object to be measured, virtual focus phenomenon can not occur, the projection picture is sharper, and the measurement precision is promoted.

In order to realize the above object, the utility model provides a structured light generates light source device, including light source and shell, follow the light source irradiation direction is equipped with light source collecting lens, diffusion piece, grating, projecting lens and protection cover plate in the shell in proper order, just light source, light source collecting lens, diffusion piece, grating and projecting lens constitute optical path system, and this optical path system locates in the shell, the light that the light source sent exports the structured light that corresponds with the grating after passing through this optical path system.

Further, the light source adopts RGB three-colour LED module or RGB three-colour laser module.

Further, the device comprises a radiator which is arranged on one side of the non-luminous surface of the light source.

Further, the projection lens is an object-side telecentric lens.

Furthermore, the inside of the shell adopts a sawtooth structure and is blackened.

Further, the grating is a stripe-shaped transmission grating.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:

(1) the utility model discloses a structure light generates light source device, the light source adopts RGB three-colour LED module or RGB three-colour laser module, can selectively output the light of different colours; by adopting the object space telecentric lens, clear focusing can be realized at each position on the three-dimensional object to be measured, virtual focus phenomenon can not occur, the projection picture is sharper, and the measurement precision is promoted to be improved;

(2) the utility model discloses a structured light generation light source device, change the operating condition of light source, can change the colour of output structured light; different gratings are used in switching, and structured light with different modes can be transmitted. The hardware structure is simpler, the stability is stronger, the volume is smaller, the cost is lower, and the practical range is wide;

(3) the utility model discloses a structure light generation light source device, the shell inside adopts the sawtooth structure and makes blacking treatment, has inhibited the stray light effectively, has promoted the quality of output structure light; a colorless transparent protective cover plate is arranged in front of the projection lens, so that the dustproof, moistureproof and scratch-proof effects are achieved;

(4) the utility model discloses a structure light generation light source device, the width of each printing opacity part is not restricted, and the width of each light-blocking part is not restricted, and the width of printing opacity part and the width of light-blocking part do not have the restriction each other yet, and light source control range is wide.

Drawings

FIG. 1 is a block diagram of a structured light projection apparatus according to an embodiment of the present invention;

FIG. 2 is a partial enlarged view of portion A of FIG. 1;

fig. 3 is a structural diagram of a strip-shaped transmissive grating according to an embodiment of the present invention;

fig. 4 is a structure diagram of the checkerboard transmission grating in the embodiment of the present invention.

Throughout the drawings, like reference numerals designate like structural elements, and wherein: 1-a radiator; 2-a light source; 3-a light source collecting lens; 4-diffusion sheet; 5-grating; 6-a projection lens; 7-protective cover plate; 8-a housing; 9-a three-dimensional object to be measured; 10-a light-transmitting portion of a strip-shaped transmission grating; 11-light blocking part of the strip-shaped transmission grating; 12-the light-transmitting part of the checkerboard transmission grating; 13-light blocking portion of checkerboard transmissive grating.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, the embodiment of the utility model provides a structured light generates light source device includes light source 2 and shell 8, follows 2 direction of illumination of light source are equipped with light source collecting lens 3, diffusion piece 4, grating 5, projection lens 6 and protective cover 7 in shell 8 in proper order, just light source 2, light source collecting lens 3, diffusion piece 4, grating 5 and projection lens 6 constitute optical path system, and this optical path system 6 is located in the shell 8, the structured light that light source 8 sent exports and grating 5 corresponds behind this optical path system.

In this embodiment, the light source installed on the heat sink 1 adopts an RGB three-color LED module or an RGB three-color laser module, and can emit light of different colors. The utility model discloses a structure light generates light source device, the light source adopts RGB three-colour LED module or RGB three-colour laser module, can selectively output the light of different colours; by adopting the object space telecentric lens, clear focusing can be realized at each position on the three-dimensional object to be measured, virtual focus phenomenon can not occur, the projection picture is sharper, and the measurement precision is promoted. Light emitted by the light source is homogenized by the diffusion sheet to form uniform illuminance distribution on the grating, and the projection lens projects an image of the grating onto the three-dimensional object to be measured to form structured light corresponding to the grating.

In one embodiment, the light source 2 is an RGB three-color LED module or an RGB three-color laser module. The light source 2 adopts RGB three-color LED module, and the operating power of each color LED in the LED module is adjustable independently. The control of the generation of three different colored output lights is described below: firstly, a red LED in the RGB three-color LED module works, and the other two LEDs are turned off, so that red light output can be realized; secondly, the red, green and blue LEDs in the RGB three-color LED module work simultaneously, and white light output can be realized by controlling the working current of each LED; and thirdly, the red LED and the green LED in the RGB three-color LED module work simultaneously, the blue LED is turned off, the working current of the red LED and the working current of the green LED are controlled, and yellow light output is realized. The utility model discloses a structured light generation light source device, change the operating condition of light source, can change the colour of output structured light; different gratings are used in switching, and structured light with different modes can be transmitted. The hardware structure is simpler, and is stable stronger, and the volume is littleer, and the cost is lower, and practical wide range.

In one embodiment, the LED lamp further comprises a heat sink 1, wherein the heat sink 1 is arranged on one side of the non-luminous surface of the light source 2. For dissipating heat from the light source 2.

In one embodiment, the projection lens 6 is an object-side telecentric lens. Can ensure that the magnification of the obtained image is not changed within a certain object distance range,

in the present embodiment, the protective cover 7 is a transparent and colorless glass protective panel.

In other embodiments, the protective cover 7 may be made of plastic material, and has functions of moisture protection, dust protection, scratch protection, and the like.

In this embodiment, the inside of the housing 8 is formed in a zigzag structure and is subjected to a blackening process. Stray light is effectively inhibited, and the quality of output structured light is improved.

Referring to fig. 3, in the present embodiment, the grating 5 is a structure diagram of a stripe-shaped transmission grating, the grating structure of the structure corresponds to projected stripe-structured light, a shaded portion 10 in the figure indicates a light transmitting portion, and 11 is a light blocking portion, the width of each light transmitting portion is not limited, the width of each light blocking portion is not limited, and the width of each light transmitting portion and the width of each light blocking portion are also not limited.

Referring to fig. 4, in other embodiments, the grating 5 is a checkerboard transmission grating structure diagram, and the grating structure of the structure corresponds to projection checkerboard structure light; the hatched portion 12 in the figure is a light-transmitting portion, and 13 is a light-blocking portion; the width of each light transmitting portion is not limited, the width of each light blocking portion is not limited, and the width of the light transmitting portion and the width of the light blocking portion are not limited to each other. The utility model discloses a structure light generation light source device, the width of each printing opacity part is not restricted, and the width of each light-blocking part is not restricted, and the width of printing opacity part and the width of light-blocking part do not have the restriction each other yet, and light source control range is wide.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims

1. The utility model provides a structured light generates light source device, its characterized in that, includes light source (2) and shell (8), follows light source (2) direction of illumination is equipped with light source collection lens (3), diffusion piece (4), grating (5), projection lens (6) and protective cover board (7) in shell (8) in proper order, just light source (2), light source collection lens (3), diffusion piece (4), grating (5) and projection lens (6) constitute optical path system, and this optical path system locates in shell (8), the structured light that light source (2) sent exports and the grating corresponds behind this optical path system.

2. A structured light generating light source device as claimed in claim 1, wherein said light source is an RGB three-color LED module or an RGB three-color laser module.

3. A structured light generating light source device according to claim 1, further comprising a heat sink (1), said heat sink (1) being arranged on a non-light emitting side of the light source.

4. A structured light source arrangement according to claim 1, wherein the projection lens (6) is an object-side telecentric lens.

5. A structured light source device according to claim 1, wherein the interior of the housing (8) is provided with a saw-tooth structure and is blackened.

6. A structured light generating light source device as claimed in claim 1, characterized in that said grating (5) is a transmissive grating.