CN113740865A - Structured light projection module and electronic equipment - Google Patents
Structured light projection module and electronic equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4911—Transmitters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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Abstract
The invention provides a structured light projection module and an electronic device, wherein the structured light projection module comprises: an emitting unit for emitting light; the light collimation unit comprises a collimation lens group used for collimating light; the light reflection unit is arranged on the light emitting side of the emission unit and is used for reflecting and folding the light; and the diffraction unit is arranged on the light transmitting side of the light reflection unit and is used for dividing the light after reflection into a plurality of speckles with preset patterns. Through setting up the reflection element, light collimation unit and emission unit promptly can with diffraction unit vertical setting to satisfy the frivolity of structured light projection module, simultaneously through setting up light collimation unit and carry out collimation processing to light, make the divergence angle and the facula size of the light of outgoing satisfy follow-up diffraction unit demand, can realize under the condition that incident laser source divergence angle is the same with collimation outgoing facula size, the speckle density of the structured light that makes the final projection higher.
Description
Technical Field
The present invention relates to the field of optical and electronic technologies, and in particular, to a structured light projection module and an electronic device.
Background
Conventional structured light devices are generally formed by combining a structured light projection module and a receiving module. The basic principle of structured light related to the technology is that a structured light projection module generates an optical signal (structured light) with certain structure special information to project to a target object, and then a receiving end acquires an image of the target object so as to facilitate related operations such as measurement in the next step.
Although structured light is a research hotspot in current three-dimensional imaging, the current structured light design still has the problems of large thickness, low projection point array density and the like, and is not favorable for being used in the field of consumer electronics which pursue thinning and high resolution nowadays.
Disclosure of Invention
The present invention is directed to a structured light projection module, and aims to solve the technical problem that the structured light design in the prior art has a large thickness and is not suitable for being applied to the electronic devices that are required to be light and thin.
In order to achieve the purpose, the invention is realized by the following technical scheme: a structured light projection module, comprising:
an emitting unit for emitting light;
a light collimating unit including a collimating lens group for collimating the light;
the light reflection unit is arranged on the light emitting side of the emission unit and is used for reflecting and folding the light;
the diffraction unit is arranged on the light transmitting side of the light reflection unit and used for dividing the light after reflection into a plurality of speckles with preset patterns and projecting the speckles on a target object required to acquire information.
Compared with the prior art, the invention has the beneficial effects that: the light reflection unit is arranged to fold the emitted light, namely the emission unit can be vertically arranged with the diffraction unit and the lens group, so that the thickness of the structured light projection module is reduced, and the structured light projection module is favorably applied to electronic equipment which pursues lightness and thinness at present.
According to an aspect of the foregoing technical solution, the collimating lens group includes a plurality of collimating lenses disposed between the emitting unit and the light reflecting unit, and the collimating lenses are configured to collimate the light.
According to an aspect of the foregoing technical solution, the collimating lens group includes a first lens disposed near one side of the emitting unit, a third lens disposed near one side of the light reflecting unit, and a second lens disposed between the first lens and the third lens.
According to an aspect of the above technical solution, aperture values D1, D2 and D3 of the first lens, the second lens and the third lens respectively satisfy:
0.8mm≤D1≤HZ-Hd-Δhmm，
0.8mm≤D2≤HZ-Hd-Δhmm，
0.8mm≤D3≤HZ-Hd-Δhmm，
and HZ is the thickness of the structured light projection module, Hd is the thickness of the diffraction unit, and Delta h is an assembly gap between the light collimation unit and the diffraction unit.
According to an aspect of the foregoing technical solution, the light reflecting unit includes a first reflecting mirror disposed between the light collimating unit and the diffracting unit.
According to one aspect of the above technical solution, the emitting unit employs a VCSEL laser, and the VCSEL laser includes a plurality of laser emitting sources.
According to an aspect of the foregoing technical solution, the light collimating unit further includes a microlens array disposed on a light emitting side of the VCSEL laser, the microlens array includes a plurality of microlenses arranged corresponding to the laser emission source, and the microlenses are used for pre-collimating the light.
According to an aspect of the above technical solution, the width DL of the microlens satisfies:
DL is less than or equal to 0.75W1, wherein W1 is the distance between two adjacent laser emission sources.
According to an aspect of the above technical solution, the microlens includes a base portion with one side attached to the VCSEL laser and an arc portion for collimating the light, and a total height H1 of the microlens satisfies:
h2 < H1, wherein H2 is the thickness of the base portion.
Another aspect of the present invention further provides an electronic device, including the structured light projection module in the foregoing technical solution, where the electronic device includes:
the acquisition module is used for acquiring the light beam information reflected by the target object;
and the processor is used for calculating and acquiring information such as the position, the depth and the like of the target object according to the light beam information.
Drawings
FIG. 1 is a schematic structural diagram of a structured light projection module according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the distribution of laser emission sources according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of the distribution of VCSEL lasers and microlens arrays in a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a VCSEL laser and a microlens array according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a DOE optical diffraction element according to a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a structured light projection module according to a first embodiment of the present invention
FIG. 7 is a schematic view of an optical path structure of a structured light projection module according to a first embodiment of the present invention
FIG. 8 is a speckle pattern formed by the DOE optical diffraction element of the first embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a structured light projection module according to a second embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a structured light projection module according to a third embodiment of the present invention;
FIG. 11 is a schematic diagram of the VCSEL laser and microlens array distribution according to the fourth embodiment of the present invention
Fig. 12 is a schematic structural view of a DOE optical diffraction element in a fifth embodiment of the present invention;
description of the main element symbols:
| VCSEL |
10 | |
11 |
| Microlens |
20 | |
31 |
| |
32 | |
33 |
| |
30 | |
40 |
| Second reflecting |
41 | DOE |
50 |
| |
51 | |
52 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 8, a structured light projection module according to a first embodiment of the present invention is shown, including:
an emitting unit for emitting light;
the light reflection unit is arranged on the light emitting side of the emission unit and is used for reflecting and folding the light;
a light collimating unit including a collimating lens group for collimating the light;
the diffraction unit is arranged on the light transmitting side of the light reflection unit and used for dividing the light after reflection into a plurality of speckles with preset patterns and projecting the speckles on a target object required to acquire information.
In this embodiment, the light reflection unit includes a first reflector 40 disposed between the light collimation unit and the diffraction unit, and the first reflector 40 is configured to reflect and fold the light collimated by the light collimation unit, so that the diffraction unit, the emission unit, and the light collimation unit can both be disposed vertically with respect to the diffraction unit. It is understood that, in other embodiments of the present application, the light reflection unit may also be an optical prism or the like plated with a reflection increasing film to implement a reflection function.
It can be understood that, in the structured light projection module in the prior art, the emission unit and the diffraction unit are usually arranged in parallel, and meanwhile, in order to improve the precision of the acquired parameters, a plurality of collimating lenses for collimating light rays are further arranged in the emission unit and the diffraction unit, so that the structured light projection module has a large thickness and is not beneficial to being applied to electronic equipment which pursues lightness and thinness nowadays.
In this embodiment, the light collimating unit includes a lens assembly disposed between the emitting unit and the light reflecting unit. In this embodiment, because the reflection unit is arranged between the emission unit and the diffraction unit, that is, the light collimation unit can also be arranged perpendicular to the diffraction unit, so that the structured light projection module is light and thin, and the light collimation unit is arranged to collimate the light, so that the divergence angle and the spot size of the emergent light meet the requirements of the subsequent diffraction unit, and the final projected structured light has higher speckle density under the condition that the divergence angle of the incident laser source is the same as the size of the collimated emergent spot.
In this embodiment, the light collimating unit includes a collimating lens group 30 disposed on one side of the microlens array 20, and the collimating lens group 30 includes a plurality of collimating lenses.
Specifically, in this embodiment, the emitting unit adopts a VCSEL Laser 10(Vertical-cavity Surface-emitting Laser), that is, a Vertical-cavity Surface-emitting Laser, and the VCSEL Laser 10 includes a plurality of Laser emitting sources 11. As shown in fig. 2, the VCSEL laser 10 employs a VSCEL array laser emission source 11, the point location of the laser emission source 11 is non-uniform, the laser emission source 11 mainly operates in the infrared band, and the typical wavelengths thereof are: 850nm, 940nm, etc.
In this embodiment, the light collimating unit includes a microlens array 20 disposed on the light emitting side of the VCSEL laser 10, and the microlens array 20 includes a plurality of microlenses arranged corresponding to the laser emitting sources 11, and the microlenses are used for pre-collimating the light.
Specifically, in the present embodiment, the light is pre-collimated by disposing the microlens array 20, so that the divergence angle of the light entering the subsequent collimating lens group 30 is relatively reduced, and higher-effect collimation is achieved, so as to meet the requirement of the diffraction unit.
In the present embodiment, as shown in fig. 3, the microlens array 20 is a rectangular convex lens, and specifically, the microlens array 20 in the present embodiment is directly formed on the VCSEL laser 10 by using an adhesive and a stamp, and it should be understood that in other embodiments of the present application, the microlens array can be separated from the VCSEL laser and be formed as a single component. The microlens or microlens array 20 may be formed by imprinting a master, and a microlens template may be formed by laser direct writing, photolithography, or an ultra-precision machine tool.
The microlens may have a spherical surface, an aspherical surface, a free-form surface, or the like, so as to collimate the light emitted from the VCSEL laser 10.
As shown in fig. 4, in some cases of the present invention, since the microlens array 20 is directly molded on the surface of the VCSEL laser 10, and in consideration of the assembly simplification, the width DL of the microlens satisfies:
DL is less than or equal to 0.75W1, wherein W1 is the distance between two adjacent laser emission sources 11, and the distance W1 between two adjacent laser emission sources 11 satisfies the following conditions: w1 is greater than or equal to 22 um.
Further, the microlens includes a base portion with one side attached to the VCSEL laser 10 and an arc portion for collimating the light, and a total height H1 of the microlens satisfies:
h2 < H1, wherein H2 is the thickness of the base portion.
Conveniently, the base portion is provided with an arc surface portion, and the total height H1 of the microlens is the thickness H2 of the base portion plus the thickness of the arc surface portion, wherein the thickness of the arc surface portion may be a negative value, and when H2 < H1, i.e., the arc surface portion protrudes from the base portion, i.e., the microlens is a convex lens. In addition, if H2 > H1, the thickness of the arc surface part is negative, the micro-lens is a concave lens. Specifically, in the present embodiment, the total height H1 of the microlens is 10 to 20um, and the thickness H2 of the base portion is 9 to 18 um.
In addition, the diffraction unit in this embodiment includes a DOE Optical diffraction element 50 (discrete Optical Elements), and the effective size of the light incident on the structured surface of the diffraction unit after the light is collimated determines the spot size of the structured light working surface. That is, the larger the size of the light source surface, the smaller the spot size of the working surface, and the relationship between the sizes is similar to the reciprocal relationship, that is, the size of the structural surface of the DOE optical diffraction element 50 should be larger than or equal to the area of all laser emission sources 11 of the VCSEL laser 10, wherein the working area of the DOE optical diffraction element 50 may be rectangular, circular or elliptical.
In this embodiment, the thickness Hd of the DOE diffractive optical element 50 is about 300um, the structured light working surface is located 0.2m to 1.5m behind the DOE diffractive optical element 50, the spot size of the structured light working surface is 1.5mm (800 mm), and the structured surface of the DOE diffractive optical element 50 is rectangular, and the size of the structured light working surface is greater than or equal to 1.3mm × 1.3 mm.
As shown in fig. 5, the DOE optical diffraction element 50 can be fabricated by a surface processing technique such as stamping or etching, and a step element 52 (the order can be 2, 4, 8, etc.) is fabricated on a substrate 51. The order of the DOE optical diffraction element 50 is 4 orders in the present embodiment, and the substrate 51 refers to a transparent optical substrate 51 material, such as: quartz, silicon, GaAs, and the like.
In the present embodiment, the divergence angle θ 1 of the light emitted from the laser emission source 11 is 18 ° to 28 °, and the divergence angle θ 1 satisfies the following condition by the collimation of the microlens array 20: theta 2 < theta 1, where theta 2 is the divergence angle of the light after being collimated by the micro-lens.
Further, in this embodiment, the light collimating unit further includes a plurality of collimating lenses disposed between the micro-lens array 20 and the light reflecting unit, and the collimating lenses are configured to collimate the light. The collimating lens structure is composed of a series of lenses, and the surface type adopts a spherical surface, an aspherical surface, a free-form surface and the like. As the material, optical materials such as Polycarbonate (PC), Cyclic Olefin Polymers (COP), and optical glass are used.
Specifically, the collimating lens group 30 includes a first lens 31 disposed near one side of the microlens array 20, a third lens 33 disposed near one side of the light reflecting unit, and a second lens 32 disposed between the first lens 31 and the third lens 33. By way of example and not limitation, in other embodiments of the present invention, the number of lenses of the collimating lens group 30 may also be two or four, etc.
To facilitate understanding, as shown in fig. 6, in some cases of the present embodiment, in order to consider the thickness of the structured light projection module, i.e. the minimum incident light spot limit required by the diffraction unit, the aperture values D1, D2, and D3 of the first lens 31, the second lens 32, and the third lens 33 respectively satisfy:
0.8mm≤D1≤HZ-Hd-Δhmm；
0.8mm≤D2≤HZ-Hd-Δhmm；
d3 is larger than or equal to 0.8mm and smaller than or equal to HZ-Hd-delta hmm, wherein HZ is the thickness of the structured light projection module, Hd is the thickness of the diffraction unit, and delta h is the assembly gap between the light collimation unit and the diffraction unit.
Specifically, in this embodiment, for the convenience of assembly, the aperture values D1, D2 and D3 of the first lens 31, the second lens 32 and the third lens 33 are all 1.3mm, and it is understood that in other embodiments of the present application, the aperture values D1, D2 and D3 are 0.8mm, 1.0mm and 1.2mm, respectively.
In addition, the focal length of the light collimation unit is in direct proportion to the density of speckles formed by light rays of the optical diffraction element, the maximum allowable incident angle of the optical diffraction element is considered, the focal length F' of the light collimation unit is 3.4-9.5 mm, and the thickness HZ of the structured light projection module is 1.9-3.5 mm in order to ensure the light and thin structure of the structured light projection module.
As shown in fig. 7, specifically, in this embodiment, a 22 ° divergence angle light ray a1 emitted by the VCSEL laser 10 is primarily collimated by the microlens array 20 to become a 9-18 ° divergence angle divergent light, the divergent light a2 is converted into a parallel light A3 having a divergence angle smaller than 0.5 ° by the collimating lens group 30, and the A3 generates a structured light having a certain structural feature during an optical diffraction period. The included angles between the parallel light finally projected to the receiving surface of the DOE optical diffraction element 50 by the light emitted by the laser emission source 11 at different positions and the optical axis are different, and the single divergence angles are all smaller than 0.5 °.
In addition, as shown in fig. 8, in the present embodiment, light emitted from a laser emission source 11 at one position on the panel of the VCSEL laser 10 enters the DOE optical diffraction element 50 through collimation of the front optical module, and is modulated by the DOE optical diffraction element 50 to be split into preset orders at the rear side to form a speckle pattern with a certain structure, where light spots in the speckle pattern may be regularly or irregularly distributed, and in the present embodiment, as shown in fig. 8, the light spots in the speckle pattern are distributed in a regular 7 × 9 array, and in addition, under the combined action of a plurality of laser emission sources 11 on the VCSEL laser 10, an overall speckle pattern with a number greater than 10000 points can be generated, so as to meet the accuracy of obtaining target parameters.
In summary, in the structured light projection module according to the above embodiments of the present invention, since the reflection unit is disposed between the emission unit and the diffraction unit, that is, the light collimation unit may also be disposed perpendicular to the diffraction unit, so that the structured light projection module is light and thin, and the light collimation unit is disposed to collimate the light, so that the divergence angle and the spot size of the emitted light meet the requirements of the subsequent diffraction unit, and the final projected structured light has a higher speckle density under the condition that the divergence angle of the incident laser source is the same as the size of the collimated exit spot.
Referring to fig. 9, a structured light projection module according to a second embodiment of the present invention is shown, wherein the structured light projection module of the present embodiment is different from the structured light projection module of the first embodiment in that: the reflecting unit further comprises a second reflecting mirror 41 arranged between the light collimating unit and the emitting unit.
In this embodiment, on the basis of the first reflecting mirror 40 disposed between the light collimating unit and the diffraction unit in the first embodiment, the second reflecting mirror 41 is further disposed between the emitting unit and the light collimating unit, that is, the VCSEL laser 10 originally disposed perpendicular to the DOE optical diffraction element 50 is about to be disposed, and by adding the second reflecting mirror 41, on the premise that the light collimating unit is maintained and the diffraction unit, the VCSEL laser 10 is disposed to be parallel to the DOE optical diffraction element 50, which facilitates the disposition of the circuit board of the VCSEL laser 10, and can reduce the structural length of the whole system, thereby being beneficial to being applied to electronic devices which seek to be thinned nowadays.
Conveniently, in the present embodiment, the specific paths of the light rays are: the VCSEL laser 10 emits light, which is pre-collimated by the micro lens, reflected by the second reflecting mirror 41 to the collimating lens group 30, collimated by the first lens 31, the second lens 32, and the third lens 33, reflected by the first reflecting mirror 40, and finally irradiated on the DOE optical diffraction element 50.
Referring to fig. 10, a structured light projection module according to a third embodiment of the present invention is shown, wherein the structured light projection module of the present embodiment is different from the structured light projection module of the first embodiment in that: the light collimating unit includes only a collimating lens group 30 disposed between the VCSEL laser 10 and the first mirror 40. In this embodiment, the light emitted from the VCSEL laser 10 is directly incident to the collimating module without being pre-collimated by the microlens array 20. The structured light projection module of this embodiment sets up microlens array 20 through reducing, can be applied to the structured light projection module that the requirement for the speckle density that the diffraction unit launches is not high, reduction in production cost.
Conveniently, in the present embodiment, the specific paths of the light rays are: the VCSEL laser 10 emits light, which is collimated by the first lens 31, the second lens 32, and the third lens 33, reflected by the first mirror 40, and finally irradiated on the DOE optical diffraction element 50.
Referring to fig. 11, a structured light projection module according to a fourth embodiment of the present invention is shown, in which the structured light projection module of the present embodiment is different from the structured light projection module of the first embodiment in that: the microlens array 20 is formed separately as one component, and the microlens array 20 is disposed separately from the VCSEL laser 10.
Referring to fig. 12, a structured light projection module according to a fifth embodiment of the present invention is shown, in which the structured light projection module of the present embodiment is different from the structured light projection module of the first embodiment in that: the order of the DOE optical diffraction element 50 is two, that is, only one step element 52 is disposed on the substrate 51.
A sixth embodiment of the present invention provides an electronic device, including the structured light projection module in the above embodiments, the electronic device including:
the acquisition module is used for acquiring the light beam information reflected by the target object;
and the processor is used for calculating and acquiring information such as the position, the depth and the like of the target object according to the light beam information.
It can be understood that, the electronic device in the embodiment is advantageous to realize the lightness and thinness of the electronic device by arranging the structured light projection module.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A structured light projection module, comprising:
an emitting unit for emitting light;
a light collimating unit including a collimating lens group for collimating the light;
the light reflection unit is arranged on the light emitting side of the emission unit and is used for reflecting and folding the light;
the diffraction unit is arranged on the light transmitting side of the light reflection unit and used for dividing the light after reflection into a plurality of speckles with preset patterns and projecting the speckles on a target object required to acquire information.
2. The structured light projection module of claim 1, wherein the collimating lens group comprises a plurality of collimating lenses disposed between the emission unit and the light reflection unit, the collimating lenses being configured to collimate the light.
3. The structured light projection module of claim 2, wherein the collimating lens group comprises a first lens disposed adjacent to a side of the emission unit, a third lens disposed adjacent to a side of the light reflection unit, and a second lens disposed between the first lens and the third lens.
4. The structured light projection module of claim 3, wherein the first, second and third lenses have aperture values D1, D2 and D3 respectively satisfying:
0.8mm≤D1≤HZ-Hd-Δhmm，
0.8mm≤D2≤HZ-Hd-Δhmm，
0.8mm≤D3≤HZ-Hd-Δhmm，
and HZ is the thickness of the structured light projection module, Hd is the thickness of the diffraction unit, and Delta h is an assembly gap between the light collimation unit and the diffraction unit.
5. The structured light projection module of claim 1, wherein the light reflection unit comprises a first mirror disposed between the light collimation unit and the diffraction unit.
6. The structured light projection module of claim 1, wherein the emission unit comprises a VCSEL laser, and the VCSEL laser comprises a plurality of laser emission sources.
7. The structured light projection module of claim 6, wherein the light collimating unit further comprises a microlens array disposed on a light emitting side of the VCSEL laser, the microlens array comprising a plurality of microlenses arranged corresponding to the laser emitting sources, the microlenses being configured to pre-collimate the light.
8. A structured light projection module according to claim 7, wherein the width DL of the micro-lenses satisfies:
DL is less than or equal to 0.75W1, wherein W1 is the distance between two adjacent laser emission sources.
9. The structured light projection module of claim 7, wherein the microlens comprises a base portion with one side abutting the VCSEL laser and a curved portion for collimating the light, and wherein the total height H1 of the microlens satisfies:
h2 < H1, wherein H2 is the thickness of the base portion.
10. An electronic device comprising the structured light projection module of any of claims 1-9, the electronic device comprising:
the acquisition module is used for acquiring the light beam information reflected by the target object;
and the processor is used for calculating and acquiring information such as the position, the depth and the like of the target object according to the light beam information.
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