CN108490572B - Laser projection module, depth camera and electronic device - Google Patents
Laser projection module, depth camera and electronic device Download PDFInfo
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- CN108490572B CN108490572B CN201810201617.8A CN201810201617A CN108490572B CN 108490572 B CN108490572 B CN 108490572B CN 201810201617 A CN201810201617 A CN 201810201617A CN 108490572 B CN108490572 B CN 108490572B
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- projection module
- optical element
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- laser projection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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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 laser projection module comprises a lens barrel, a diffraction optical element and an annular sealing piece. The lens cone comprises a lens cone side wall and is provided with an accommodating cavity. The diffractive optical element is accommodated in the accommodating cavity. The sealing member is disposed between the barrel side wall and the diffractive optical element and seals a gap between the barrel side wall and the diffractive optical element. The laser projection module is provided with the sealing piece between the lens barrel and the diffraction optical element, so that the sealing piece can seal a gap between the side wall of the lens barrel and the diffraction optical element, and dust and/or moisture outside the laser projection module can be prevented from entering the laser projection module from the gap between the side wall of the lens barrel and the diffraction optical element to influence the use of the laser projection module. The invention also discloses an electronic device and a depth camera.
Description
Technical Field
The invention relates to the technical field of consumer electronics, in particular to a laser projection module, a depth camera and an electronic device.
Background
In the existing laser projection module, a gap generally exists between a lens barrel and a diffractive optical element installed in the lens barrel, so that dust and/or moisture outside the laser projection module easily enter the laser projection module along the gap to further influence the use of the laser projection module.
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:
the lens cone comprises a lens cone side wall and is provided with an accommodating cavity;
a diffractive optical element housed in the housing cavity; and
an annular seal disposed between the barrel sidewall and the diffractive optical element and sealing a gap between the barrel sidewall and the diffractive optical element.
In some embodiments, the lens barrel sidewall includes an inner surface close to the receiving cavity, the inner surface defines a lens barrel receiving groove surrounding the receiving cavity, and the sealing member is received in the lens barrel receiving groove.
In some embodiments, the diffractive optical element includes a diffractive side surface, the diffractive side surface defines a diffractive receiving groove surrounding the diffractive optical element, and the sealing member is received in the diffractive receiving groove.
In some embodiments, the barrel sidewall includes an inner surface adjacent to the receiving cavity, the barrel includes an annular step extending from the inner surface into the receiving cavity, and the diffractive optical element is in interference with the step.
In some embodiments, the laser projection module further comprises:
a light source housed in the housing chamber and configured to emit laser light; and
the collimating element is accommodated in the accommodating cavity and is used for collimating laser emitted by the light source; the diffractive optical element is used for diffracting the laser light collimated by the collimating element to form a laser light pattern.
In some embodiments, the light source comprises a vertical cavity surface emitting laser or an edge emitting laser.
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 circuit board assembly and a fixing member for fixing the light source on the circuit board assembly.
In some embodiments, the fixing member includes an encapsulant disposed between the edge-emitting laser and the circuit board assembly, and the encapsulant is a thermally conductive adhesive.
In some embodiments, the fixing member includes at least two elastic support frames disposed on the circuit board assembly, at least two support frames together form a receiving space for receiving the light source, and at least two support frames are used for supporting the light source.
The depth camera in the embodiment of the invention comprises:
the laser projection module of any one of the above embodiments;
and the image collector is used for collecting the laser patterns projected into the target space by the laser projection module.
An electronic device according to an embodiment of the present invention includes:
a housing; and
the depth camera described above, wherein the depth camera is disposed on the housing and exposed from the housing to acquire the depth image.
According to the electronic device, the depth camera and the laser projection module, the sealing piece is arranged between the lens barrel and the diffraction optical element, so that the sealing piece can seal the gap between the side wall of the lens barrel and the diffraction optical element, and therefore dust and/or moisture outside the laser projection module can be prevented from entering the laser projection module from the gap between the lens barrel and the diffraction optical element to influence the use of the laser projection module.
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 a laser projection module according to some embodiments of the present invention.
Fig. 2 is an enlarged schematic view of the laser projection module II in fig. 1.
Fig. 3 is a cross-sectional view of the laser projection module of fig. 1 taken along III-III.
Fig. 4 to 6 are cross-sectional views of other embodiments of the laser projection module along the line III-III of fig. 1.
Fig. 7 to 9 are schematic partial structural views of a laser projection module according to an embodiment of the invention.
FIG. 10 is a schematic diagram of a depth camera in accordance with certain embodiments of the invention.
Fig. 11 is a schematic structural diagram of an electronic device according to some embodiments of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1, a laser projection module 10 according to an embodiment of the present invention includes a lens barrel 12, a diffractive optical element 15, and an annular sealing member 17. The lens barrel 12 includes a barrel sidewall 122 and defines a receiving cavity 121. The diffractive optical element 15 is accommodated in the accommodation cavity 121. The seal 17 is provided between the barrel side wall 122 and the diffractive optical element 15 and seals a gap between the barrel side wall 122 and the diffractive optical element 15.
In the laser projection module 10 according to the embodiment of the present invention, the sealing member 17 is disposed between the barrel sidewall 122 and the diffractive optical element 15, so that the sealing member 17 can seal the gap between the barrel sidewall 122 and the diffractive optical element 15, thereby preventing dust and/or moisture outside the laser projection module 10 from entering the laser projection module 10 from the gap between the barrel sidewall 122 and the diffractive optical element 15 to affect the use of the laser projection module 10.
Referring to fig. 1 and 2, a laser projection module 10 according to an embodiment of the invention includes a circuit board assembly 11, a lens barrel 12, a light source 13, a collimating element 14, a diffractive optical element 15, and an annular sealing member 17.
The circuit board 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 have a through hole 113, the through 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 a connector 19, and the connector 19 may connect the laser projection module 10 to a main board of the electronic device 1000 (as shown in fig. 11).
The lens barrel 12 is disposed on the circuit board assembly 11. The lens barrel 12 includes a first surface 124 and a second surface 125 opposite to each other. In the present embodiment, the second surface 125 of the lens barrel 12 is disposed on the circuit board 112, and specifically, the second surface 125 may be disposed on the circuit board 112 by at least one of gluing, clamping, screwing, and the like. In other embodiments, the second surface 125 of the lens barrel 12 may be disposed on the substrate 111.
The barrel 12 includes a barrel sidewall 122 and an annular step 123. The barrel sidewall 122 surrounds a receiving cavity 121, and the receiving cavity 121 penetrates the first surface 124 and the second surface 125. The barrel sidewall 122 includes an inner surface 1221 adjacent to the receiving cavity 121, and the inner surface 1221 defines a barrel receiving groove 126 surrounding the receiving cavity 121. The step 123 is formed from the inner surface 1221 extending into the receiving cavity 121. The annular step 123 encloses a light passing hole 1231, and the light passing hole 1231 may be a part of the accommodating cavity 121. The step 123 includes a first limiting surface 1232 and a second limiting surface 1233, and the first limiting surface 1232 is opposite to the second limiting surface 1233. Specifically, the step 123 is located between the first surface 124 and the second surface 125, the first position-limiting surface 1232 is closer to the first surface 124 than the second position-limiting surface 1233, and the first position-limiting surface 1232 and the second position-limiting surface 1233 may be parallel planes. Referring to fig. 3, the lens barrel 12 of the present embodiment has a circular cross section. In other embodiments, the outer contour of the cross section of the lens barrel 12 may be circular, elliptical, rectangular or any polygon, and the inner contour of the cross section of the lens barrel 12 may also be circular, elliptical, rectangular or any polygon, for example, referring to fig. 4, the outer contour of the cross section of the lens barrel 12 is circular, and the inner contour thereof is elliptical; alternatively, referring to fig. 5, the outer contour of the cross section of the lens barrel 12 is circular, and the inner contour thereof is rectangular; alternatively, the outer contour of the cross section of the lens barrel 12 is circular, and the inner contour thereof is polygonal; alternatively, referring to fig. 6, the outer contour of the cross section of the lens barrel 12 is rectangular, and the inner contour thereof is circular. It should be noted that the cross-sections are all at the location of line III-III in fig. 1.
The light source 13 is disposed on the circuit board assembly 11 and received in the receiving cavity 121. 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 which time, the light source 13 may be electrically connected to the circuit board 112 by arranging 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. 1 and fig. 2, 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 along a direction in which the second surface 125 points to the first surface 124, specifically, the collimating element 14 includes a combining surface 143, and when the combining surface 143 is combined with the second limiting surface 1233, the collimating element 14 may be considered to be installed in place. 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 combining surface 143 is an end surface of the mounting portion 142, and the optical portion 141 includes two curved surfaces located on opposite sides of the collimating element 14. One of the curved surfaces of the collimating element 14 extends into the light passing aperture 1231.
The diffractive optical element 15 is accommodated in the accommodation cavity 121. The diffractive optical element 15 includes a diffractive mounting surface 151 and a diffractive side surface 152 surrounding the diffractive mounting surface 151. The diffractive mounting surface 151 is provided on the first stopper surface 1232. The diffraction side surface 152 is opened with a diffraction accommodation groove 153 surrounding the diffractive optical element 15. The diffractive optical element 15 is configured to diffract the laser light collimated by the collimating element 14 to form a laser light pattern, specifically, some regions on the diffractive mounting surface 151 may be formed with a diffractive structure, the diffractive structure may correspond to the position of the light passing hole 1231 and diffract the laser light collimated by the collimating element 14 out of the laser light pattern corresponding to the diffractive structure, and other regions on the diffractive mounting surface 151 may be a plane and combined with the first limiting surface 1232. The diffractive optical element 15 can be made of glass, or, as it were, of a composite plastic (e.g., PET).
The shape of the diffractive optical element 15 of the embodiment of the invention is matched with the shape of the containing cavity 121, the diffractive optical element 15 is in a sheet structure, specifically, the outer contour shape of the diffractive optical element 15 is similar to the inner contour shape of the cross section of the lens barrel 12, and the outer contour dimension of the diffractive optical element 15 is smaller than the inner contour dimension of the cross section of the lens barrel 12. In other embodiments, the outer contour shape of the diffractive optical element 15 may not be similar to the inner contour shape of the cross section of the lens barrel 12, for example, when the inner contour shape of the cross section of the lens barrel 12 is a circle, the outer contour shape of the diffractive optical element 15 may be an ellipse, a rectangle, or an arbitrary polygon (as shown in fig. 4 to 5); alternatively, when the inner contour shape of the cross section of the lens barrel 12 is a rectangle, the outer contour shape of the diffractive optical element 15 may be an ellipse, a circle, or an arbitrary polygon.
Referring to fig. 3 to 5, the seal 17 is accommodated in the barrel accommodation groove 126 and the diffraction accommodation groove 153, specifically, the seal 17 has a ring shape, an inner side 171 of the seal 17 is accommodated in the diffraction accommodation groove 153, and an outer side 172 of the seal 17 is accommodated in the barrel accommodation groove 126. The inner contour shape of the sealing member 17 is similar to the outer contour shape of the diffractive optical element 15, and the outer contour shape of the sealing member 17 is similar to the inner contour shape of the lens barrel 12, for example, referring to fig. 3, when the inner contour shape of the lens barrel 12 is circular and the outer contour shape of the diffractive optical element 15 is circular, the sealing member 17 is circular ring-shaped; referring to fig. 5, when the inner contour of the lens barrel 12 is circular and the outer contour of the diffractive optical element 15 is rectangular, the inner contour of the sealing member 17 is rectangular and the outer contour is circular. The seal 17 may be a rubber seal.
In the laser projection module 10 according to the embodiment of the present invention, the sealing member 17 is disposed between the barrel sidewall 122 and the diffractive optical element 15, so that the sealing member 17 can seal the gap between the barrel sidewall 122 and the diffractive optical element 15, thereby preventing dust and/or moisture outside the laser projection module 10 from entering the laser projection module 10 from the gap between the barrel sidewall 122 and the diffractive optical element 15 to affect the use of the laser projection module 10.
The laser projection module 10 of the embodiment of the present invention further has the following advantageous effects: first, the barrel sidewall 122 is provided with the barrel accommodation groove 126 to facilitate the installation of the sealing member 17 on the barrel 12, and to facilitate the positioning of the sealing member 17, and to improve the effect of the sealing member 17 on sealing the gap between the barrel 12 and the diffractive optical element 15.
Secondly, the diffractive optical element 15 is provided with the diffractive accommodation groove 153, so that the sealing member 17 can be conveniently mounted on the diffractive optical element 15, the sealing member 17 can be conveniently positioned, and the effect of sealing the gap between the lens barrel 12 and the diffractive optical element 15 by the sealing member 17 can be improved.
Third, the provision of the step 123 on the barrel 12 facilitates the mounting of the diffractive optical element 15 into the housing cavity 121 and facilitates the positioning of the diffractive optical element 15.
In some embodiments, the lens barrel housing groove 126 may not be formed in the inner surface 1221 of the lens barrel 12 in the above embodiments, and in this case, the inner side 171 of the seal 17 is housed in the diffraction housing groove 153, and the outer side 172 of the seal 17 directly abuts against the inner surface 1221 of the lens barrel 12.
In some embodiments, the diffractive side surface 152 of the diffractive optical element 15 of the above-described embodiments may not have the diffractive accommodation groove 153, and in this case, the outer side 172 of the seal 17 is accommodated in the barrel accommodation groove 126, and the inner side 171 of the seal 17 directly abuts against the diffractive side surface 152 of the diffractive optical element 15.
In some embodiments, the lens barrel housing groove 126 may not be formed on the inner surface 1221 of the lens barrel 12 of the above embodiments, and the diffractive side surface 152 of the diffractive optical element 15 may not be formed with the diffractive housing groove 153, in which case the outer side 172 of the sealing member 17 directly abuts against the inner surface 1221 of the lens barrel 12, and the inner side 171 of the sealing member 17 directly abuts against the diffractive side surface 152 of the diffractive optical element 15.
In some embodiments, the lens barrel 12 of the above embodiments may not have the step 123, and in this case, the positioning function of the barrel accommodating groove 126 and the diffraction accommodating groove 153 enables the diffractive optical element 15 to be mounted in an appropriate position in the accommodating cavity 121, and the diffractive optical element 15 can be fixed in the accommodating cavity 121 by dispensing.
Referring to fig. 3 and 7, 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 circuit board 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. 7 and 8, 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 circuit board 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. 7, 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 circuit board assembly 11. More specifically, in the example shown in fig. 8, the side-emitting laser 131 is bonded to the circuit board assembly 11 on the side opposite to the light emitting surface 1311. In the example shown in fig. 9, the side surface 1312 of the edge-emitting laser 131 may be bonded to the circuit board assembly 11, and the sealant 181 may surround the side surface 1312 on the periphery, or only one of the side surfaces 1312 may be bonded to the circuit board assembly 11, or some of the side surfaces may be bonded to the circuit board assembly 11. Further, the sealing compound 181 may be a heat conductive adhesive to conduct heat generated by the operation of the light source 13 to the circuit board 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 circuit board assembly 11.
Referring to fig. 9, in some embodiments, the fixing member 18 includes at least two elastic supporting frames 182 disposed on the circuit board 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.
Referring to fig. 1 and 2, in some embodiments, the step 123 is formed with a detection through hole 1234 penetrating the first limiting surface 1232 and the second limiting surface 1233, the detection through hole 1234 is spaced apart from the light passing hole 1231, and a central axis of the detection through hole 1234 may be a straight line. The laser diffraction module 10 further comprises a detection device 16, and the detection device 16 comprises a transmitter 161 and a receiver 162. The emitter 161 and the receiver 162 are mounted one on the collimating element 14 and the other on the diffractive optical element 15. Specifically, the transmitter 161 may be disposed on the bonding face 143, and the receiver 162 is disposed on the diffractive mounting face 151; or the transmitter 161 may be disposed on the diffractive mounting surface 151 and the receiver 162 disposed on the bonding surface 143. The embodiment of the present invention will be described by taking an example in which the transmitter 161 is provided on the coupling surface 143 and the receiver 162 is provided on the diffractive mounting surface 151. The transmitter 161 and the receiver 162 are installed to be aligned with both ends of the detection through hole 1234, and the transmitter 161 is used to transmit a detection signal into the detection through hole 1234 from one end, and the detection signal passes through the detection through hole 1234 to the other end and is received by the receiver 162. The receiver 162 analyzes information such as the intensity and phase of the received detection signal to determine whether the mounting positions of the collimating element 14 and the diffractive optical element 15 are correct at this time.
The transmitter 161 may be an acoustic transmitter and is configured to transmit a detection acoustic wave, in which case the receiver 162 may be an acoustic receiver and is configured to receive the detection acoustic wave, which may be an ultrasonic wave, through the detection through hole 1234; the emitter 161 may be a light emitter and configured to emit detection light, and the receiver 162 may be a light receiver and configured to receive detection light, which may be laser light, through the detection through hole 1234. The present invention is described by taking an example in which the transmitter 161 is an optical transmitter and the receiver 162 is an optical receiver, and the transmitter 161 transmits the detection signal only to the surface of the receiver 162, and the receiver 162 receives the detection signal only to the surface (receiving surface) of the transmitter 161. In the embodiment of the present invention, when the collimating element 14 and the diffractive optical element 15 are correctly installed, the detection signal emitted by the emitter 161 passes through the detection through hole 1234 and is not reflected by the inner wall of the detection through hole 1234, the propagation path of the detection signal to the receiver 162 is short, and when the detection signal is vertically incident on the receiving surface of the receiver 161, the intensity of the detection signal received by the receiver 162 is high.
When the collimating element 14 is displaced, tilted, or falls off, the detection signal emitted by the emitter 161 is reflected by the inner wall of the detection through hole 1234 many times and then received by the receiver 162 during the process of passing through the detection through hole 1234, the propagation path of the detection signal reaching the receiver 162 is long, and the strength of the detection signal received by the receiver 162 is weak. When the diffractive optical element 15 is displaced, tilted, or falls off, the receiving surface of the receiver 162 no longer faces the transmitter 161, the detection signal received by the receiver 162 is not perpendicularly incident on the receiving surface, or a part of the receiving surface is not aligned with the detection through hole 1234 and cannot receive the detection signal, and the intensity of the detection signal received by the receiver 162 is weak. Therefore, the receiver 162 can determine whether the collimating element 14 and the diffractive optical element 15 are in the correct mounting positions by determining the intensity of the received detection signal.
Referring to fig. 10, a depth camera 100 according to an embodiment of the present disclosure includes a laser projection module 10 and an image collector 20 according to any one of the above embodiments. 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.
In the depth camera 100 according to the embodiment of the invention, the sealing member 17 is disposed between the barrel sidewall 122 and the diffractive optical element 15, so that the sealing member 17 can seal the gap between the barrel sidewall 122 and the diffractive optical element 15, thereby preventing dust and/or moisture outside the laser projection module 10 from entering the laser projection module 10 from the gap between the barrel sidewall 122 and the diffractive optical element 15 to affect the use of the laser projection module 10.
Referring to FIG. 10, in some embodiments, the depth camera 100 further includes a processor 30. 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.
Referring to fig. 11, 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.
In the electronic device 1000 according to the embodiment of the invention, the sealing member 17 is disposed between the barrel sidewall 122 and the diffractive optical element 15, so that the sealing member 17 can seal the gap between the barrel sidewall 122 and the diffractive optical element 15, thereby preventing dust and/or moisture outside the laser projection module 10 from entering the laser projection module 10 from the gap between the barrel sidewall 122 and the diffractive optical element 15 to affect the use of the laser projection module 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" or the like 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, etc., 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 (10)
1. A laser projection module, comprising:
the lens cone comprises a lens cone side wall and is provided with an accommodating cavity;
a diffractive optical element housed in the housing cavity; and
an annular seal disposed between the barrel sidewall and the diffractive optical element and sealing a gap between the barrel sidewall and the diffractive optical element;
the side wall of the lens cone comprises an inner surface close to the containing cavity, the lens cone comprises an annular step formed by extending from the inner surface towards the inside of the containing cavity, and the diffractive optical element is abutted against the step;
the laser projection module further comprises:
a light source housed in the housing chamber and configured to emit laser light; and
the collimating element is accommodated in the accommodating cavity and is used for collimating laser emitted by the light source; the diffraction optical element is used for diffracting the laser collimated by the collimation element to form a laser pattern;
the step comprises a first limiting surface and a second limiting surface, the first limiting surface is opposite to the second limiting surface, the step is provided with a detection through hole penetrating through the first limiting surface and the second limiting surface, the step is surrounded to form a light passing hole, and the detection through hole is separated from the light passing hole;
the laser projection module further comprises a detection device, the detection device comprises a transmitter and a receiver, one of the transmitter and the receiver is mounted on the collimation element, the other of the transmitter and the receiver is mounted on the diffraction optical element, the transmitter and the receiver are both mounted in an aligning mode with two ends of the detection through hole, the transmitter is used for transmitting a detection signal, and the detection signal is received by the receiver; the receiver analyzes the received detection signal to judge whether the mounting positions of the collimating element and the diffractive optical element are correct or not.
2. The laser projection module as claimed in claim 1, wherein the barrel sidewall includes an inner surface adjacent to the receiving cavity, the inner surface defines a barrel receiving groove surrounding the receiving cavity, and the sealing member is received in the barrel receiving groove.
3. The laser projection module of claim 1 or 2, wherein the diffractive optical element comprises a diffractive side surface, the diffractive side surface defines a diffractive receiving groove surrounding the diffractive optical element, and the sealing member is received in the diffractive receiving groove.
4. The laser projection module of claim 1, wherein the light source comprises a vertical cavity surface emitting laser or an edge emitting laser.
5. The laser projection module of claim 1, wherein the light source comprises an edge-emitting laser comprising a light emitting face, the light emitting face facing the collimating element.
6. The laser projection module of claim 5, further comprising a circuit board assembly and a fixing member for fixing the light source on the circuit board assembly.
7. The laser projection module of claim 6, wherein the mounting member comprises a sealant disposed between the edge-emitting laser and the circuit board assembly, the sealant being a thermally conductive adhesive.
8. The laser projection module of claim 6, wherein the fixing member comprises at least two elastic support frames disposed on the circuit board assembly, at least two support frames together form a receiving space for receiving the light source, and at least two support frames are used for supporting the light source.
9. A depth camera, comprising:
the laser projection module of any of claims 1-8;
and the image collector is used for collecting the laser patterns projected into the target space by the laser projection module.
10. An electronic device, comprising:
a housing; and
the depth camera of claim 9, disposed on and exposed from the housing to acquire a depth image.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810201617.8A CN108490572B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810201617.8A CN108490572B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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| CN108490572B true CN108490572B (en) | 2021-04-23 |
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| CN109751521B (en) * | 2019-03-07 | 2020-07-28 | 维沃移动通信有限公司 | Light module and mobile terminal |
| CN110493400B (en) | 2019-08-28 | 2021-11-02 | Oppo广东移动通信有限公司 | Projection module and terminal |
| DE102021103147A1 (en) * | 2021-02-10 | 2022-08-11 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | OPTOELECTRONIC DEVICE AND METHOD |
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| AU5792400A (en) * | 1999-09-14 | 2001-03-15 | Jds Uniphase Inc. | Aligning and manufacturing components |
| US6692161B2 (en) * | 2001-03-29 | 2004-02-17 | Intel Corporation | High frequency emitter and detector packaging scheme for 10GB/S transceiver |
| CN2625924Y (en) * | 2003-03-10 | 2004-07-14 | 力捷电脑股份有限公司 | Fixing device for lens |
| US7233723B2 (en) * | 2004-07-29 | 2007-06-19 | Avago Technologies Fiber Ip (Singapore) Pte. Ltd. | Optoelectronic assembly with coupling features for alignment |
| EP1843243B1 (en) * | 2006-04-05 | 2012-02-22 | Société Civile "GALILEO 2011" | Opto-electronic device for determining relative movements or relative positions of two objects |
| JP2009536553A (en) * | 2006-05-08 | 2009-10-15 | ボストン サイエンティフィック リミテッド | Optical assembly for medical imaging devices |
| EP2232656A4 (en) * | 2007-12-17 | 2014-04-16 | Ii Vi Laser Entpr Gmbh | Laser emitter modules and methods of assembly |
| KR101419381B1 (en) * | 2010-04-07 | 2014-07-15 | 한국전자통신연구원 | Apparatus for Bi-directional Optical transmission |
| US9341787B2 (en) * | 2013-01-02 | 2016-05-17 | Micron Technology, Inc. | Apparatus providing simplified alignment of optical fiber in photonic integrated circuits |
| US10234695B2 (en) * | 2015-02-16 | 2019-03-19 | Apple Inc. | Low-temperature hermetic sealing for diffractive optical element stacks |
| CN105372905A (en) * | 2015-11-24 | 2016-03-02 | 深圳奥比中光科技有限公司 | Laser module and image information acquisition apparatus |
| CN206274127U (en) * | 2016-12-22 | 2017-06-23 | 信利光电股份有限公司 | A kind of laser projection module |
| CN206877030U (en) * | 2017-07-07 | 2018-01-12 | 深圳奥比中光科技有限公司 | Light-emitting device and its laser projection module |
| CN107357118A (en) * | 2017-08-02 | 2017-11-17 | 深圳奥比中光科技有限公司 | Optics module with high heat dispersion |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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