CN108344377B - Laser projection module, depth camera and electronic device - Google Patents
Laser projection module, depth camera and electronic device Download PDFInfo
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- CN108344377B CN108344377B CN201810201608.9A CN201810201608A CN108344377B CN 108344377 B CN108344377 B CN 108344377B CN 201810201608 A CN201810201608 A CN 201810201608A CN 108344377 B CN108344377 B CN 108344377B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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Abstract
The invention discloses a laser projection module. The laser projection module comprises a substrate assembly, a lens cone, a light source, a collimation element and a diffraction optical element. The lens barrel includes a barrel top wall and a barrel side wall. One end of the side wall of the lens cone is arranged on the substrate component and forms an accommodating cavity together with the substrate component, and the other end of the side wall of the lens cone is covered by the top wall of the lens cone. The top wall of the lens cone is provided with a light-emitting through hole. The side wall of the lens cone is provided with a mounting hole. The lens cone further comprises a limiting protrusion protruding inwards from the side wall of the lens cone, and the mounting hole is located between the limiting protrusion and the top wall of the lens cone. The light source is arranged on the substrate assembly and used for emitting laser to the accommodating cavity. The collimating element is received in the receiving cavity. The diffraction optical element penetrates into the mounting hole and is mounted on the limiting protrusion, and the light source, the collimation element, the diffraction optical element and the light outlet through hole are sequentially arranged on a light path of the light source. The invention also discloses a depth camera and an electronic device. The top wall of the lens cone can prevent the diffractive optical element from being separated along the light-emitting direction, and the safety of the laser projection module is improved.
Description
Technical Field
The present invention relates to the field of optical and electronic technologies, and in particular, to a laser projection module, a depth camera and an electronic device.
Background
In a laser projector, a Diffractive Optical Element (DOE) needs to be installed in a lens barrel to form a laser pattern, a through hole is usually formed in the top of the lens barrel along a light exit direction, so that the diffractive optical element is installed in the lens barrel, and in use, the diffractive optical element is easy to be separated from the lens barrel along the light exit direction, which causes damage to a user after laser is directly emitted.
Disclosure of Invention
The embodiment of the invention provides a laser projection module, a depth camera and an electronic device.
The laser projection module of the embodiment of the invention comprises:
a substrate assembly;
the lens cone comprises a lens cone top wall and a lens cone side wall, one end of the lens cone side wall is arranged on the substrate assembly and forms an accommodating cavity together with the substrate assembly, the other end of the lens cone side wall is covered by the lens cone top wall, the lens cone top wall is provided with a light outlet through hole, the lens cone side wall is provided with a mounting hole, the lens cone further comprises a limiting bulge protruding inwards from the lens cone side wall, and the mounting hole is positioned between the limiting bulge and the lens cone top wall;
a light source disposed on the substrate assembly and configured to emit laser light to the accommodation cavity;
a collimating element received within the receiving cavity; and
the diffractive optical element penetrates into the mounting hole and is mounted on the limiting protrusion, and the light source, the collimating element, the diffractive optical element and the light outlet through hole are sequentially arranged on a light path of the light source.
In some embodiments, the limiting protrusion comprises a limiting surface, the diffractive optical element is combined with the limiting surface, and the inner wall of the mounting hole far away from the top wall of the lens barrel is a mounting bottom wall;
the limiting surface is flush with the mounting bottom wall; or
The limiting surface and the mounting bottom wall form a height difference.
In some embodiments, the laser projection module further comprises a protective cover detachably mounted on the lens barrel and closing the mounting hole.
In some embodiments, an inner wall of the mounting hole, which is away from the top wall of the lens barrel, is a mounting bottom wall, an accommodating groove is formed in the mounting bottom wall, the laser projection module further includes a locking mechanism, and the locking mechanism includes:
a locking member at least partially received in the receiving groove; and
the elastic piece, the both ends of elastic piece fixed connection respectively the lens cone with the locking piece, the locking piece can be followed under the exogenic action the mounting hole stretches into in the accepting groove and make the elastic piece takes place deformation, and when the exogenic action was cancelled, the elastic piece will the locking piece pushes the mounting hole.
In some embodiments, the diffractive optical element is formed with a top surface, a bottom surface, and a side surface, the top surface is opposite to the bottom surface and is located on an optical path of the light source, the side surface connects the top surface and the bottom surface, and a light-impermeable light-shielding film is disposed on a position of the side surface corresponding to the mounting hole.
In some embodiments, the diffractive optical element is formed with a top surface, a bottom surface, and a side surface, the top surface is opposite to the bottom surface and is located on the optical path of the light source, the side surface connects the top surface and the bottom surface, the laser projection module further includes a photodetector, the photodetector is disposed in the mounting hole, and the photodetector is configured to receive and detect the laser emitted from the side surface.
In some embodiments, the light source comprises an edge-emitting laser comprising a light emitting face, the light emitting face facing the collimating element.
In some embodiments, the laser projection module further comprises a fixing member for fixing the edge-emitting laser to the substrate assembly.
In some embodiments, the fixing member includes an encapsulant disposed between the edge-emitting laser and the substrate assembly, and the encapsulant is a thermally conductive adhesive.
The fixing piece comprises at least two elastic support frames arranged on the substrate assembly, at least two support frames jointly form an accommodating space, the accommodating space is used for accommodating the edge-emitting laser, and at least two support frames are used for supporting the edge-emitting laser.
The depth camera of the embodiment of the invention comprises:
the laser projection module of any of the above embodiments;
the image collector is used for collecting the laser patterns projected into the target space after passing through the diffractive optical element; and
and the processor is respectively connected with the laser projection module and the image collector and is used for processing the laser pattern to obtain a depth image.
An electronic device according to an embodiment of the present invention includes:
a housing; and
the depth camera of the above embodiment, disposed within and exposed from the housing to acquire a depth image.
In the laser projection module, the depth camera and the electronic device provided by the embodiment of the invention, when the diffractive optical element is arranged on the limiting protrusion, the top wall of the lens barrel can prevent the diffractive optical element from coming off along the light-emitting direction, so that the laser is prevented from being emitted out without passing through the diffractive optical element to hurt a user, and the use safety is improved.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a depth camera according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a laser projection module according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the portion IV of the laser projection module shown in FIG. 3;
fig. 5 to 9 are enlarged schematic views of the laser projection module according to another embodiment of the present invention, corresponding to the portion IV in fig. 3;
fig. 10 to 12 are schematic views of partial structures of a laser projector according to an embodiment of the present invention.
Description of the main element symbols:
the electronic device 1000, the housing 200, the depth camera 100, the laser projection module 10, the substrate assembly 11, the circuit board 111, the receiving hole 113, the lens barrel 12, the receiving cavity 121, the barrel sidewall 122, the coupling surface 1221, the mounting hole 1222, the mounting bottom wall 1223, the limiting protrusion 123, the light passing hole 1231, the limiting surface 1232, the barrel top wall 124, the light passing hole 1241, the receiving groove 125, the light source 13, the edge-emitting laser 131, the light emitting surface 1311, the side surface 1312, the collimating element 14, the optical portion 141, the mounting portion 142, the diffractive optical element 15, the top surface 151, the bottom surface 152, the side surface 153, the light shielding film 154, the photodetector 16, the connector 17, the fixing element 18, the sealant 181, the supporting frame 182, the receiving space 183, the locking mechanism 19, the locking element 191, the guiding surface 1911, the abutting surface 1912, the elastic element 192, the protective cover 1a, the image acquirer 20, the.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.
In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, an electronic device 1000 according to an embodiment of the invention includes a housing 200 and a depth camera 100. The electronic device 1000 may be a mobile phone, a tablet computer, a laptop computer, a game machine, a head display device, an access control system, a teller machine, etc., and the embodiment of the present invention is described by taking the electronic device 1000 as a mobile phone, it is understood that the specific form of the electronic device 1000 may be other, and is not limited herein. The depth camera 100 is disposed in the housing 200 and exposed from the housing 200 to obtain a depth image, the housing 200 can provide protection for the depth camera 100, such as dust prevention, water prevention, and falling prevention, and a hole corresponding to the depth camera 100 is formed in the housing 200, so that light passes through the hole or penetrates into the housing 200.
Referring to fig. 2, the depth camera 100 includes a laser projection module 10, an image collector 20 and a processor 30. The depth camera 100 may be formed with a projection window 40 corresponding to the laser projection module 10, and a collection window 50 corresponding to the image collector 20. The laser projection module 10 is configured to project a laser pattern to a target space through the projection window 40, and the image collector 20 is configured to collect the laser pattern modulated by a target object through the collection window 50. In one example, the laser projected by the laser projection module 10 is infrared light, and the image collector 20 is an infrared camera. The processor 30 is connected to both the laser projection module 10 and the image collector 20, and the processor 30 is configured to process the laser pattern to obtain a depth image. Specifically, the processor 30 calculates the deviation value between each pixel point in the laser pattern and each corresponding pixel point in the reference pattern by using an image matching algorithm, and further obtains the depth image of the laser pattern according to the deviation value. The image matching algorithm may be a Digital Image Correlation (DIC) algorithm. Of course, other image matching algorithms may be employed instead of the DIC algorithm. The structure of the laser projection module 10 will be further described below.
Referring to fig. 3, the laser projection module 10 includes a substrate assembly 11, a lens barrel 12, a light source 13, a collimating element 14, and a diffractive optical element 15. The light source 13, the collimating element 14 and the diffractive optical element 15 are arranged in this order on the optical path of the light source 13, in particular, the light emitted by the light source 13 passes through the collimating element 14 and the diffractive optical element 15 in this order.
Referring to fig. 3, the substrate assembly 11 includes a substrate 111 and a circuit board 112 carried on the substrate 111. The substrate 111 is used to carry the lens barrel 12, the light source 13, and the circuit board 112. The material of the substrate 111 may be plastic, such as at least one of Polyethylene Terephthalate (PET), polymethyl methacrylate (PMMA), Polycarbonate (PC), and Polyimide (PI). That is, the substrate 111 may be made of a single plastic material selected from PET, PMMA, PC, and PI. Thus, the substrate 111 is light in weight and has sufficient support strength.
The circuit board 112 may be any one of a printed circuit board, a flexible circuit board, and a rigid-flex board. The circuit board 112 may be provided with a via hole 113, the via hole 113 may be used to accommodate the light source 13, a portion of the circuit board 112 is covered by the lens barrel 12, and another portion of the circuit board extends out and may be connected to the connector 17, and the connector 17 may connect the laser projection module 10 to a main board of the electronic device 1000.
Referring to fig. 3, the lens barrel 12 is disposed on the substrate assembly 11 and forms a receiving cavity 121 together with the substrate assembly 11. Specifically, the lens barrel 12 may be connected to the circuit board 112 of the substrate assembly 11, and the lens barrel 12 and the circuit board 112 may be adhered by an adhesive to improve the air tightness of the accommodating chamber 121. Of course, the lens barrel 12 and the substrate assembly 11 may be connected in other specific ways, such as by a snap connection. The accommodating cavity 121 may be used to accommodate components such as the collimating element 14 and the diffractive optical element 15, and the accommodating cavity 121 simultaneously forms a part of the optical path of the laser projection module 10. The barrel 12 includes a barrel top wall 124, a barrel side wall 122, and a stopper protrusion 123.
The barrel sidewall 122 surrounds the receiving cavity 121, and in the embodiment of the present invention, the barrel sidewall 122 is a hollow cylinder, one end of the barrel sidewall 122 is disposed on the substrate assembly 11 and forms the receiving cavity 121 together with the substrate assembly 11, and the other end is covered by the barrel top wall 124. The outer wall of the barrel sidewall 122 may be formed with a positioning structure and a mounting structure to fix the position of the laser projection module 10 when the laser projection module 10 is mounted in the electronic device 1000. The barrel side wall 122 is formed with a combining surface 1221, and the combining surface 1221 is combined with the circuit board 112. The barrel sidewall 122 has a mounting hole 1222, and the mounting hole 1222 communicates the accommodating cavity 121 and the outside. In the present embodiment, the mounting hole 1222 is opened at a position near the lens barrel top wall 124.
The lens barrel top wall 124 is formed at an end of the lens barrel side wall 122 opposite to the circuit board 112, and the lens barrel top wall 124 may be integrally formed with the lens barrel side wall 122, or the lens barrel side wall 122 may be formed separately and then fixedly connected, for example, fixedly connected by welding, clamping or screwing. The lens barrel top wall 124 is provided with a light-emitting through hole 1241, the light-emitting through hole 1241 is communicated with the accommodating cavity 121, and the laser passes through the light-emitting through hole 1241 and then exits the laser projection module 10.
Referring to fig. 3 and 4, the limiting protrusion 123 protrudes inward from the barrel sidewall 122, and specifically, the limiting protrusion 123 protrudes inward from the barrel sidewall 122 into the receiving cavity 121. The mounting hole 1222 is located between the limiting protrusion 123 and the barrel top wall 124, or the limiting protrusion 123 and the barrel top wall 124 are located on two opposite sides of the mounting hole 1222. The limiting protrusion 123 may be continuous and annular, or the limiting protrusion 123 includes a plurality of limiting protrusions 123, and the plurality of limiting protrusions 123 are distributed at intervals. The limiting protrusion 123 encloses a light passing hole 1231, and the light passing hole 1231 may be a part of the accommodating cavity 121. The accommodating cavity 121 between the limiting protrusion 123 and the combining surface 1221 may be configured to accommodate the collimating element 14, the accommodating cavity 121 between the limiting protrusion 123 and the lens barrel top wall 124 may be configured to accommodate the diffractive optical element 15, and the laser passes through the collimating element 14 and the light passing hole 1231 and then passes through the diffractive optical element 15. Meanwhile, when the laser projection module 10 is assembled, when the diffractive optical element 15 abuts against the limiting protrusion 123, the diffractive optical element 15 can be considered to be installed in place, and when the collimating element 14 abuts against the limiting protrusion 123, the collimating element 14 can be considered to be installed in place. The stopper protrusion 123 includes a stopper surface 1232, and the stopper surface 1232 is combined with the diffractive optical element 15 when the diffractive optical element 15 is mounted on the stopper protrusion 123.
Referring to fig. 3, the light source 13 is disposed on the substrate assembly 11, specifically, the light source 13 may be disposed on the circuit board 112 and electrically connected to the circuit board 112, and the light source 13 may also be disposed on the substrate 111 and received in the via 113, at this time, the light source 13 may be electrically connected to the circuit board 112 by disposing a wire. The light source 13 is used for emitting Laser light, which may be infrared light, and in one example, the light source 13 may include a semiconductor substrate disposed on the substrate 111 and an emitting Laser disposed on the semiconductor substrate, which may be a Vertical Cavity Surface Emitting Laser (VCSEL). The semiconductor substrate may be provided with a single emitting laser or with an array laser composed of a plurality of emitting lasers, and specifically, the plurality of emitting lasers may be arranged on the semiconductor substrate in a regular or irregular two-dimensional pattern.
Referring to fig. 3, the collimating element 14 may be an optical lens, the collimating element 14 is used for collimating laser light emitted by the light source 13, the collimating element 14 is accommodated in the accommodating cavity 121, and the collimating element 14 may be assembled into the accommodating cavity 121 from an end of the barrel side wall 122 away from the barrel top wall 124 along a light emitting direction of the light source 13. The collimating element 14 includes an optical portion 141 and a mounting portion 142, the mounting portion 142 is used for combining with the barrel sidewall 122 to fix the collimating element 14 in the accommodating cavity 121, in the embodiment of the present invention, the optical portion 141 includes two curved surfaces located on two opposite sides of the collimating element 14. One of the curved surfaces of the collimating element 14 extends into the light passing aperture 1231.
Referring to fig. 3 and 4, the diffractive optical element 15 is mounted on the position-limiting protrusion 123, when the diffractive optical element 15 is mounted, the diffractive optical element 15 can penetrate into the receiving cavity 121 from the mounting hole 1222, and when the diffractive optical element 15 penetrates into the receiving cavity 121, the diffractive optical element 121 is supported on the position-limiting protrusion 123 and is combined with the position-limiting protrusion 123. Specifically, the diffractive optical element 15 is combined with the stopper face 1232 of the stopper protrusion 123. In addition, before the diffractive optical element 15 is placed in the accommodating cavity 121, glue may be dispensed on the limiting surface 1232, so that the diffractive optical element 15 is reliably coupled to the limiting protrusion 123. The diffractive optical element 15 includes a top surface 151, a bottom surface 152, and side surfaces 153. The top surface 151 is opposite to the bottom surface 152 and is located on the optical path of the light source 13, the top surface 151 is a diffraction exit surface, the bottom surface 152 is a diffraction incident surface, and the side surface 153 connects the top surface 151 and the bottom surface 152. In the embodiment of the present invention, the bottom surface 152 is combined with the limiting surface 1232, the diffraction structure may be formed on the bottom surface 152, and the diffractive optical element 15 may project the laser collimated by the collimating element 14 to a laser pattern corresponding to the diffraction structure. The diffractive optical element 15 can be made of glass, or, as it were, of a composite plastic (e.g., PET). Referring to fig. 4, in an example, the inner wall of the mounting hole 1222 away from the lens barrel top wall 124 is a mounting bottom wall 1223, and the limiting surface 1232 forms a height difference with the mounting bottom wall 1223, and after the diffractive optical element 15 is combined with the limiting surface 1232, the mounting bottom wall 1223 can limit the diffractive optical element 15 to move along the radial direction of the lens barrel 12, so as to prevent the diffractive optical element 15 from coming out of the mounting hole 1222.
In summary, in the electronic device 1000 according to the embodiment of the invention, when the diffractive optical element 15 is mounted on the limiting protrusion 123, the top wall 124 of the lens barrel can prevent the diffractive optical element 15 from coming off along the light emitting direction, so as to prevent the laser from being emitted without passing through the diffractive optical element 15 and injuring the user, and improve the safety of use.
Referring to fig. 5, in some embodiments, the stop surface 1232 is flush with the mounting bottom wall 1223. At this time, the height difference between the barrel top wall 124 and the stopper protrusion 123 may be equal to the thickness of the diffractive optical element 15, or slightly larger than the thickness of the diffractive optical element 15, so that when the diffractive optical element 15 is mounted on the stopper protrusion 123, the diffractive optical element 15 is held by the stopper protrusion 123 and the barrel top wall 124 and is not easily removed from the mounting hole 1222.
With continued reference to fig. 5, in some embodiments, the light-shielding film 154 is disposed on the side 153 corresponding to the mounting hole 1222. The light shielding film 154 has a low transmittance or is completely opaque to the laser light, and the light shielding film 154 can prevent the laser light from leaking out of the mounting hole 1222 after passing through the side surface 153, and also prevent external light from entering the mounting hole 1222 and passing through the side surface 153 and interfering with the laser light in the diffractive optical element 15. The light shielding film 154 may be a light shielding paper, a light shielding adhesive, a light absorbing ink, or the like, which is attached to the side surface 153. Further, the light shielding film 154 may also be a double-sided reflective film with a high reflectivity, one side of which reflects the laser beam in the laser projection module 10, and the other side of which reflects the external light.
Referring to fig. 3 and 6, in some embodiments, the laser projection module 10 further includes a photodetector 16. The photodetector 16 is disposed in the mounting hole 1222, and the photodetector 16 receives and detects the laser light emitted from the side surface 153. The photodetector 16 receives the laser light emitted from the side surface 153, and detects the intensity of the laser light to determine the use state of the diffractive optical element 15. For example, when the light source 13 emits laser light at a predetermined power, the light intensity detected by the light detector 16 is a predetermined light intensity in the case where the diffractive optical element 15 is normal, and when the light intensity detected by the light detector 16 deviates from the predetermined light intensity (is larger or smaller), it is indicated that the diffractive optical element 15 may have been damaged. The light detector 16 may further communicate information to the processor 30 of the electronic device 1000 (as shown in fig. 2) that the diffractive optical element 15 may have been damaged, and the processor 30 may then control the light source 13 to stop emitting light to prevent the laser light from being emitted by the laser projector 10 without being properly processed and injuring the user.
Referring to fig. 7, in some embodiments, the laser projection module 10 further includes a protective cover 1a, and the protective cover 1a is detachably mounted on the lens barrel 12 and closes the mounting hole 1222. The protective cover 1a may be made of a material with good elasticity, such as silicon rubber, etc., and the protective cover 1a may partially extend into the mounting hole 1222 and press against the inner wall of the mounting hole 1222, so as to prevent the protective cover 1a from falling out of the mounting hole 1222 and to seal the mounting hole 1222, thereby preventing dust or moisture from entering the mounting hole 1222 and contaminating the diffractive optical element 15.
Referring to fig. 8 and 9, in some embodiments, the mounting bottom wall 1223 defines a receiving groove 125, and the laser projection module 10 further includes a locking mechanism 19, wherein the locking mechanism 19 includes a locking member 191 and an elastic member 192. The lock member 191 is at least partially received in the receiving groove 125. The lens barrel 12 and the locking member 191 are respectively fixed to two ends of the elastic member 192, and the locking member 191 can extend into the accommodating groove 125 from the mounting hole 1222 under the action of an external force to deform the elastic member 192. And when the external force is removed, the elastic member 192 pushes the latch member 161 into the mounting hole 1222.
Specifically, the locking member 191 is formed with a guiding surface 1911 and a supporting surface 1912, the supporting surface 1912 is closer to the accommodating cavity 121 than the guiding surface 1911, the guiding surface 1911 may be an inclined surface or a curved surface, and the supporting surface 1912 may be a flat surface. As shown in fig. 8a, when the diffractive optical element 15 is not mounted, the lock member 191 closes the mounting hole 1222 by the elastic force of the elastic member 192. As shown in fig. 8b, in the process of gradually pushing the diffractive optical element 15 into the mounting hole 1222, the diffractive optical element 15 abuts against the guide surface 1911, and the locking member 191 gradually extends into the receiving groove 125 and the elastic member 192 deforms under the pushing force of the diffractive optical element 15. As shown in fig. 9a, when the locking member 191 completely extends into the receiving groove 125, the mounting hole 1222 is completely opened, and the diffractive optical element 15 can be further pushed into the receiving cavity 121. As shown in fig. 9b, the locking member 191 is inserted into the mounting hole 125 again by the elastic force of the elastic member 192 and closes the mounting hole 1222 again until the diffractive optical element 15 is pushed into the housing cavity 151. At this time, the lock member 191 prevents the diffractive optical element 15 from coming out of the mounting hole 1222, and when the user needs to take out the diffractive optical element 15, the user can push the guide surface 1911 to insert the lock member 191 into the receiving groove 125 to open the mounting hole 1222, and then take out the diffractive optical element 15.
Referring to fig. 3 and 10, in some embodiments, the light source 13 includes an edge-emitting Laser (EEL) 131, and specifically, the EEL 131 may be a distributed feedback Laser (DFB). The edge-emitting laser 131 is columnar as a whole, and a light-emitting surface 1311 is formed on one end surface of the edge-emitting laser 131 away from the substrate assembly 11, and laser light is emitted from the light-emitting surface 1311, with the light-emitting surface 1311 facing the collimating element 14. The edge-emitting laser 131 is adopted as a light source, on one hand, the temperature drift of the edge-emitting laser 131 is smaller than that of a VCSEL array, and on the other hand, the edge-emitting laser 131 is of a single-point light-emitting structure, so that an array structure does not need to be designed, the manufacturing is simple, and the cost of the light source of the laser projection module 10 is low.
Referring to fig. 10 and 11, in some embodiments, the laser projection module 10 further includes a fixing member 18, and the fixing member 18 is used for fixing the edge-emitting laser 131 on the substrate assembly 11. When the laser of the distributed feedback laser propagates, the gain of power is obtained through the feedback of the grating structure. To improve the power of the distributed feedback laser, the injection current needs to be increased and/or the length of the distributed feedback laser needs to be increased, which may increase the power consumption of the distributed feedback laser and cause serious heat generation. When the light emitting surface 1311 of the edge-emitting laser 131 faces the collimating element 14, the edge-emitting laser 131 is vertically placed, and because the edge-emitting laser 131 is of a slender strip structure, the edge-emitting laser 131 is prone to falling, shifting or shaking accidents, and therefore the edge-emitting laser 131 can be fixed by arranging the fixing member 18, and the edge-emitting laser 131 is prevented from falling, shifting or shaking accidents.
Specifically, referring to fig. 10, in some embodiments, the fixing member 18 includes an encapsulant 181, and the encapsulant 181 is disposed between the edge-emitting laser 131 and the substrate assembly 11. More specifically, in the example shown in fig. 10, the side emitting laser 131 is bonded to the substrate assembly 11 on the side opposite to the light emitting surface 1311. In the example shown in fig. 11, the side surface 1312 of the edge-emitting laser 131 may be bonded to the substrate assembly 11, and the side surface 1312 around the side surface may be covered with the sealant 181, or only one of the side surfaces 1312 may be bonded to the substrate assembly 11, or some of the side surfaces may be bonded to the substrate assembly 11. Further, the encapsulant 181 may be a heat conductive adhesive to conduct heat generated by the operation of the light source 13 to the substrate assembly 11. In order to improve the heat dissipation efficiency, the substrate 111 may further be formed with a heat dissipation hole 1111, heat generated by the operation of the light source 13 or the circuit board 112 may be dissipated through the heat dissipation hole 1111, and the heat dissipation hole 1111 may be filled with a thermal conductive adhesive to further improve the heat dissipation performance of the substrate assembly 11.
Referring to fig. 12, in some embodiments, the fixing member 18 includes at least two elastic supporting frames 182 disposed on the substrate assembly 11, the at least two supporting frames 182 together form an accommodating space 183, the accommodating space 183 is used for accommodating the edge-emitting laser 131, and the at least two supporting frames 182 are used for supporting the edge-emitting laser 131 to further prevent the edge-emitting laser 131 from shaking.
In some embodiments, the substrate 111 may be omitted and the light source 13 may be directly fixed to the circuit board 112 to reduce the overall thickness of the laser projector 10.
In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means 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, schematic representations of the above terms 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.
Claims (12)
1. A laser projection module, comprising:
a substrate assembly;
the lens cone comprises a lens cone top wall and a lens cone side wall, one end of the lens cone side wall is arranged on the substrate assembly and forms an accommodating cavity together with the substrate assembly, the other end of the lens cone side wall is covered by the lens cone top wall, the lens cone top wall is provided with a light emitting through hole, the lens cone side wall is provided with a mounting hole, the lens cone further comprises a limiting bulge protruding inwards from the lens cone side wall, the mounting hole is positioned between the limiting bulge and the lens cone top wall, and the limiting bulge is surrounded to form a light passing hole;
a light source disposed on the substrate assembly and configured to emit laser light to the accommodation cavity;
the collimating element is accommodated in the accommodating cavity and comprises an optical part and an installation part, and the optical part comprises two curved surfaces which are positioned on two opposite sides of the collimating element; and
the diffractive optical element penetrates into the mounting hole and is mounted on the limiting protrusion, the light source, the collimating element, the diffractive optical element and the light-emitting through hole are sequentially arranged on a light path of the light source, the diffractive optical element and the collimating element are respectively positioned on two opposite sides of the limiting protrusion, and one curved surface of the collimating element extends into the light-passing hole.
2. The laser projection module of claim 1, wherein the limiting protrusion comprises a limiting surface, the diffractive optical element is combined with the limiting surface, and an inner wall of the mounting hole, which is far away from the top wall of the lens barrel, is a mounting bottom wall;
the limiting surface is flush with the mounting bottom wall; or
The limiting surface and the mounting bottom wall form a height difference.
3. The laser projection module of claim 1, further comprising a protective cover removably mounted on the lens barrel and closing the mounting hole.
4. The laser projection module of claim 1, wherein an inner wall of the mounting hole away from the top wall of the lens barrel is a mounting bottom wall, the mounting bottom wall is provided with a receiving groove, the laser projection module further comprises a locking mechanism, and the locking mechanism comprises:
a locking member at least partially received in the receiving groove; and
the elastic piece, the both ends of elastic piece fixed connection respectively the lens cone with the locking piece, the locking piece can be followed under the exogenic action the mounting hole stretches into in the accepting groove and make the elastic piece takes place deformation, and when the exogenic action was cancelled, the elastic piece will the locking piece pushes the mounting hole.
5. The laser projection module of claim 1, wherein the diffractive optical element is formed with a top surface, a bottom surface and a side surface, the top surface is opposite to the bottom surface and is located on an optical path of the light source, the side surface connects the top surface and the bottom surface, and a light-tight light-shielding film is disposed on a position of the side surface corresponding to the mounting hole.
6. The laser projection module of claim 1, wherein the diffractive optical element is formed with a top surface, a bottom surface, and a side surface, the top surface is opposite to the bottom surface and is located on an optical path of the light source, the side surface connects the top surface and the bottom surface, the laser projection module further comprises a light detector disposed in the mounting hole, the light detector is configured to receive and detect the laser light emitted from the side surface.
7. The laser projection module of any one of claims 1-6, wherein the light source comprises an edge emitting laser comprising a light emitting face, the light emitting face facing the collimating element.
8. The laser projection module of claim 7, further comprising a fixture for securing the edge-emitting laser to the substrate assembly.
9. The laser projection module of claim 8, wherein the mounting member comprises an encapsulant disposed between the edge-emitting laser and the substrate assembly, the encapsulant being a thermally conductive adhesive.
10. The laser projection module of claim 8, wherein the fixing member comprises at least two elastic support frames disposed on the substrate assembly, at least two support frames together form a receiving space for receiving the edge-emitting laser, and at least two support frames are used for supporting the edge-emitting laser.
11. A depth camera, comprising:
the laser projection module of any of claims 1-10;
the image collector is used for collecting the laser patterns projected into the target space after passing through the diffractive optical element; and
and the processor is respectively connected with the laser projection module and the image collector and is used for processing the laser pattern to obtain a depth image.
12. An electronic device, comprising:
a housing; and
the depth camera of claim 11, disposed within and exposed from the housing to acquire a depth image.
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| CN201810201608.9A CN108344377B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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| CN201810201608.9A CN108344377B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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| CN108344377A CN108344377A (en) | 2018-07-31 |
| CN108344377B true CN108344377B (en) | 2020-05-15 |
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| CN109151271A (en) * | 2018-08-22 | 2019-01-04 | Oppo广东移动通信有限公司 | Laser projection mould group and its control method, image acquisition equipment and electronic device |
| CN109212763B (en) * | 2018-09-27 | 2020-06-05 | Oppo广东移动通信有限公司 | Light emitting module, damage detection method thereof, depth acquisition device and electronic equipment |
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| CN109445123A (en) * | 2018-12-13 | 2019-03-08 | 昆山丘钛微电子科技有限公司 | Emitter and depth camera including the emitter |
| CN110190503A (en) * | 2019-04-23 | 2019-08-30 | 维沃移动通信有限公司 | Fixing seat, laser projection mould group and electronic equipment |
| CN116295088B (en) * | 2023-05-19 | 2023-09-12 | 广东芯聚能半导体有限公司 | Insertion depth detection device for contact pin |
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