CN210109471U - Laser projection module, depth camera and electronic device - Google Patents

Abstract

The application discloses laser projection module, degree of depth camera and electron device. The laser projection module comprises a light source, a collimation element, a diffraction optical element, a lens cone and a protective cover covered on the lens cone. The collimating element and the diffractive optical element are sequentially disposed on an optical path of the light source. The lens cone comprises a lens cone side wall, a limiting bulge and a fixing bulge, and the diffractive optical element is arranged on the limiting bulge. The visor is including offering the protection roof that leads to the unthreaded hole and the protection lateral wall of offering the fixed orifices, and fixed protrusion stretches into in the fixed orifices, and the diffraction optical element is located between spacing arch and the protection roof, still is formed with first rubber ring between diffraction optical element and the protection roof. Be provided with first rubber ring between diffractive optical element and the protection roof, can avoid liquid to get into the laser projection module between diffractive optical element and the protection roof, adhere to on diffractive optical element's surface, lead to the zero order laser energy reinforcing that the laser projection module throwed, harm human eye safety.

Description

Laser projection module, depth camera and electronic device

Technical Field

The present application relates to the field of consumer electronics, and more particularly, to a laser projection module, a depth camera, and an electronic device.

Background

With the rapid development of electronic technology, electronic devices such as smart phones and tablet computers have become more and more popular. The laser projection module can be arranged on the electronic device and can be used for diffusing laser spots into a spot pattern with a certain angle by utilizing the diffractive optical element to project the spot pattern on an object. When the laser energy projected by the laser projection module is too strong, the safety of human eyes can be endangered.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a laser projection module, a depth camera and an electronic device.

The embodiment of the application provides a laser projection module, which comprises a light source, a collimating element and a diffractive optical element, wherein the collimating element and the diffractive optical element are sequentially arranged on a light path of the light source; the protective cover comprises a protective top wall and a protective side wall extending from the protective top wall, a light through hole is formed in the protective top wall and corresponds to the diffractive optical element, a fixing hole is formed in the protective side wall, the protective cover covers the lens barrel, the fixing protrusion extends into the fixing hole, the diffractive optical element is located between the limiting protrusion and the protective top wall, and a first rubber ring is further formed between the diffractive optical element and the protective top wall.

In some embodiments, the laser projection module further includes a substrate assembly, the side wall of the lens barrel is disposed on the substrate assembly and forms a receiving cavity together with the substrate assembly, the light source is disposed on the substrate assembly, the collimating element is received in the receiving cavity, the lens barrel includes a first surface and a second surface opposite to each other, the second surface is combined with the substrate assembly, the limiting protrusion is located between the first surface and the second surface, and the top protection wall abuts against the first surface.

In some embodiments, the stop protrusion comprises a stop surface on which the diffractive optical element is mounted, and a second rubber ring is formed between the diffractive optical element and the stop surface.

In some embodiments, the lens barrel is provided with a glue accommodating groove on the limiting surface, and the second rubber ring is formed in the glue accommodating groove.

In some embodiments, the laser projection module further includes a substrate assembly, the side wall of the lens barrel is disposed on the substrate assembly and forms an accommodation cavity together with the substrate assembly, the light source is disposed on the substrate assembly, the collimating element is accommodated in the accommodation cavity, the lens barrel includes a first surface and a second surface that are opposite to each other, the second surface is combined with the substrate assembly, the first surface coincides with the upper surface of the limiting protrusion, and the protective top wall abuts against the diffractive optical element.

In some embodiments, the diffractive optical element is mounted on the first face with a second rubber ring formed therebetween.

In some embodiments, the lens barrel is formed with a glue containing groove on the first surface, and the second rubber ring is formed in the glue containing groove.

In some embodiments, a sealant is formed between the combination of the fixing protrusion and the fixing hole,

in some embodiments, the protection side wall includes a plurality of protection sub side walls that meet end to end in proper order, and at least two be formed with on the protection sub side wall the fixed orifices, fixed bellied quantity with the same and the position correspondence of fixed orifices, every fixed arch stretches into correspondingly in the fixed orifices, the fixed orifices position all scribbles sealed glue.

In some embodiments, at least two opposite side walls of the protector are formed with the fixing holes,

in some embodiments, the fixing protrusion is formed with a guiding inclined plane, the guiding inclined plane is gradually far away from the side wall of the lens barrel along a direction in which the protective cover is sleeved into the lens barrel, and the protective side wall is abutted against the guiding inclined plane in a process that the protective cover is covered on the lens barrel.

In some embodiments, the laser projection module further includes a protection cover, the protection cover and the cover plate form an accommodation space, the protection cover is accommodated in the accommodation space, the protection top wall is combined with the cover plate, and the protection side wall is combined with the protection cover.

The embodiment of the application further provides a depth camera, which comprises the laser projection module, an image collector and a processor, wherein the image collector is used for collecting laser patterns projected into a target space after passing through the diffractive optical element; the processor is respectively connected with the laser projection module and the image collector and is used for processing the laser patterns to obtain depth images.

The embodiment of the present application further provides an electronic device, which includes a housing and the depth camera of the above embodiment, wherein the depth camera is combined with the housing.

Among the laser projection module, degree of depth camera and electron device of this application embodiment, be provided with first rubber ring between diffraction optical element and the protection roof, can avoid liquid to throw the module by getting into laser between diffraction optical element and the protection roof, adhere to the surface at diffraction optical element, lead to the laser to throw the zero order laser energy reinforcing that the module throwed, harm human eye safety.

Drawings

The above and/or additional aspects and advantages of the present application 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 present application;

FIG. 2 is a schematic diagram of a depth camera according to an embodiment of the present application;

fig. 3 is a schematic perspective view of a laser projection module according to an embodiment of the present disclosure;

FIG. 4 is a schematic plan view of a laser projection module according to an embodiment of the present disclosure;

fig. 5 is an exploded perspective view of a laser projection module according to an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view of the laser projection module shown in FIG. 4 taken along line VI-VI;

FIG. 7 is a schematic cross-sectional view of another embodiment of the present application taken along a position corresponding to the VI-VI line of the laser projection module shown in FIG. 4;

FIG. 8 is a schematic cross-sectional view of the laser projection module shown in FIG. 4 taken along line VIII-VIII;

FIG. 9 is an enlarged schematic view of portion IX of the laser projection module of FIG. 8;

FIG. 10 is a schematic perspective view of a lens barrel of a laser projector according to an embodiment of the present application;

FIG. 11 is a schematic representation of a normal diffractive microstructure according to an embodiment of the present application;

FIG. 12 is a schematic diagram of speckles when the laser projection module of the present application projects laser light normally;

FIG. 13 is a schematic representation of a diffractive microstructure according to an embodiment of the present application after feeding;

FIG. 14 is a schematic diagram of speckles when a diffraction microstructure of a laser projection module is fed with liquid and then projects laser;

fig. 15 is a perspective view of a protective cover of a laser projection module according to an embodiment of the present disclosure;

fig. 16 is an exploded perspective view of a laser projection module according to an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the embodiments of the present application.

Referring to fig. 1, an electronic device 1000 according to an embodiment of the present disclosure includes a depth camera 100 and a housing 200. 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., in the embodiment of the present application, the electronic device 1000 is taken as an example for illustration, 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.

Referring to fig. 3 to 6, the laser projection module 10 includes a substrate assembly 11, a lens barrel 12, a light source 13, a collimating element 14, a Diffractive Optical Element (DOE) 15, and a protective cover 16. The collimating element 14 and the diffractive optical element 15 are arranged in sequence 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 sequence.

Referring to fig. 5 and 6, 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 112 extends out and may be connected to the connector 19, and the connector 19 may connect the laser projection module 10 to a main board of the electronic device 1000.

Referring to fig. 6 to 8, 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. In the embodiment of the present application, the lens barrel 12 is in a hollow cylindrical shape, and the lens barrel 12 includes a barrel sidewall 122, a limiting protrusion 123, and a fixing protrusion 127.

The barrel sidewall 122 surrounds the receiving cavity 121, and 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 lens barrel 12 includes a first surface 124 and a second surface 125 opposite to each other, wherein one opening of the receiving cavity 121 is opened on the second surface 125, and the other opening is opened on the first surface 124. The second surface 125 is bonded, for example, glued, to the circuit board 112, and the first surface 124 may be used as a bonding surface for the lens barrel 12 and the diffractive optical element 15, or as a bonding surface for the lens barrel 12 and the protective cover 16.

Referring to fig. 8 and 9, 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 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 forms a light passing hole 1231, the light passing hole 1231 may be a part of the accommodating cavity 121, and the laser passes through the light passing hole 1231 and then penetrates into the diffractive optical element 15. In the embodiment shown in fig. 6, the limiting protrusion 123 is located between the first surface 124 and the second surface 125, the receiving cavity 121 between the limiting protrusion 123 and the second surface 125 can be used for receiving the collimating element 14, and the receiving cavity 121 between the limiting protrusion 123 and the first surface 124 can be used for receiving 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. 5, 8, 9 and 10, a fixing protrusion 127 protrudes outward from the barrel sidewall 122, specifically, the fixing protrusion 127 protrudes outward from the outer wall of the barrel sidewall 122. The fixing protrusion 127 is located closer to the first surface 124 than to the second surface 125, and in one example, the fixing protrusion 127 may be located corresponding to the position-limiting protrusion 123. In the embodiment of the present application, the barrel sidewall 122 includes a first section 1221 and a second section 1222 connected to each other, the first section 1221 and the second section 1222 may be integrally formed, the first surface 124 is formed on the first section 1221, and the second surface 125 is formed on the second section 1222. The outer size of the first section 1221 is smaller than the outer size of the second section 1222, the fixing protrusion 127 is formed on the first section 1221, so that after the fixing protrusion 127 protrudes from the first section 1221, the total outer size of the first section 1221 and the fixing protrusion 127 is not larger than the outer size of the second section 1222, and the fixing protrusion 127 does not cause the outer size of the lens barrel 12 to increase.

Referring to fig. 8, 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 corresponding to 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 to emit laser light, which may be infrared light. In one example, the light source 13 may include a semiconductor substrate disposed on the substrate 111 and a light emitting Laser (VCSEL) disposed on the semiconductor substrate. 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. 8, the collimating element 14 may be an optical lens, and the collimating element 14 is used for collimating the laser light emitted by the light source 13. The collimating element 14 is received in the receiving cavity 121, and the collimating element 14 can be assembled into the receiving cavity 121 along a direction in which the second face 125 points to the first face 124. 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 application, 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. 8 and 9, the diffractive optical element 15 is mounted on the limiting protrusion 123, and specifically, the diffractive optical element 15 is combined with the limiting surface 1232 to be mounted on the limiting protrusion 123. In the embodiment of the present application, a diffraction structure may be formed on the incident surface (i.e., the surface combined with the limiting surface 1232) and/or the exit surface of the diffractive optical element 15, 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 material of the diffractive optical element 15 includes Polycarbonate (PC).

It is understood that the rupture of the diffractive optical element 15 will cause the laser emitted from the laser projection module 10 to be directly emitted, which is similar to directly irradiating the human eye with a laser pen, and the direct vision for 1 second will exceed the safety standard of the human eye, and the human eye may be irreversibly damaged. The eye safety hazard created by the fracture of the diffractive optical element 15 is much more severe than the zero order enhancement of the diffractive optical element 15.

Specifically, the polycarbonate material is a nearly colorless glassy amorphous polymer, and has the advantages that ① has good optical property, high transparency and free dyeing property, light rays emitted by the light source 13 can be ensured to penetrate through the diffractive optical element 15 after being collimated by the collimating element 14, ② has high strength and elastic coefficient, high impact strength and wide use temperature range, the situation that the diffractive optical element 15 is cracked or scratched can be effectively prevented, ③ has low forming shrinkage and good dimensional stability, the installation of the diffractive optical element 15 can be firmer, and the structure of the laser projection module 10 is more stable.

Of course, in other embodiments, the diffractive optical element 15 may be made of glass, or may be made of composite plastic (such as PET), and is not limited herein.

The laser wavelength emitted by the light source 13 is 940nm, and the laser beam is collimated by the collimating element 14, then is diffracted by the diffractive optical element 15 to shape and uniformly project the beam to a space, so that a speckle field is formed. The diffraction pattern of the diffractive optical element 15 is realized by multi-zone replication, and in the using process, under the conditions that water mist in a humid environment enters the laser projection module 10 and is attached to the surface of the diffractive optical element 15, and the like, the energy of the zero-order zone of the diffractive optical element 15 is obviously enhanced, and the human eyes are injured. Fig. 11 shows a normal diffraction structure, in which the inner space is arranged regularly. Correspondingly, fig. 12 is a speckle pattern of the laser projection module 10 when the laser is normally projected, and the normal speckle pattern is a speckle pattern formed by splicing a plurality of small speckle patterns. FIG. 13 is a diagram showing the filled diffraction structures after liquid feeding, and the spatial arrangement of the diffraction structures after liquid feeding is disordered. Correspondingly, fig. 14 is a speckle pattern when the diffraction structure of the laser projection module 10 is fed with liquid and then projects laser, and the pattern shows that the laser projection brightness in the middle area is most concentrated, which is expressed as zero-order energy enhancement, and once the laser projection brightness is incident on human eyes, human eyes are easily stabbed, and the safety of the human eyes is damaged.

It is understood that the surface of the diffractive optical element is usually a very fine diffractive surface, however, during the production or use of the laser projection module, moisture or other liquid may adhere to the surface of the diffractive optical element, so that the diffraction efficiency of the diffractive optical element is reduced, and even the diffractive optical element diffracts the light beam in an unexpected direction, burning the eyes of the user.

Referring to fig. 3, the protective cover 16 is coupled to the lens barrel 12, the protective cover 16 is used for limiting the position of the diffractive optical element 15, and specifically, the protective cover 16 is used for preventing the diffractive optical element 15 from falling out of the lens barrel 12 after the coupling of the diffractive optical element 15 and the lens barrel 12 fails. Referring to fig. 6, the protective cover 16 includes a protective top wall 161 and a protective side wall 162.

Referring to fig. 8 and 9, the protective top wall 161 and the limiting protrusion 123 are respectively located on two opposite sides of the diffractive optical element 15, or the diffractive optical element 15 is located between the limiting protrusion 123 and the protective top wall 161, so that even if the combination of the diffractive optical element 15 and the limiting protrusion 123 fails, the diffractive optical element 15 cannot be separated due to the limiting effect of the protective top wall 161. The protective top wall 161 is provided with a light through hole 1611, the position of the light through hole 1611 corresponds to the diffractive optical element 15, and the laser passes through the light through hole 1231, the diffractive optical element 15 and the light through hole 1611 in sequence and then is emitted from the laser projection module 10. In the embodiment of the present application, the overall shape of the protection top wall 161 is a rounded square, and the light passing hole 1611 may be a regular polygon, a circle, a rectangle, an ellipse, a trapezoid, or the like. The aperture size of the light passing hole 1611 is smaller than at least one of the width or the length of the diffractive optical element 15 to confine the diffractive optical element 15 between the protective top wall 161 and the stopper protrusion 123. In the embodiment shown in fig. 6, when the protective cover 16 is combined with the lens barrel 12, the protective top wall 161 is abutted against the first surface 124, and further, the protective top wall 161 may be combined with the first surface 124 by gluing or the like.

Referring to fig. 8, 9 and 15, the protection sidewall 162 extends from the periphery of the protection top wall 161, the protection cover 16 covers the lens barrel 12, and the protection sidewall 162 is fixedly connected to the lens barrel sidewall 122. The protective sidewall 162 is provided with a fixing hole 1622, and when the protective cover 16 covers the lens barrel 12, the fixing protrusion 127 extends into the fixing hole 1622, and the fixing hole 1622 is coated with a sealant 1623. Specifically, the position where the fixing hole 1622 is opened corresponds to the position of the fixing protrusion 127, the protective cover 16 has certain elasticity, in the process of covering the protective cover 16 on the lens barrel 12, the fixing protrusion 127 and the protective side wall 162 abut against each other, the fixing protrusion 127 supports the protective side wall 162, the protective side wall 162 is elastically deformed, when the protective cover is mounted in place, the fixing protrusion 127 extends into the fixing hole 1622, and the sealant 1623 of the fixing hole 1622 makes the fixing protrusion 127 not support the protective side wall 162 any more, the protective side wall 162 is restored to the original state, and the tactile feedback and the sound feedback of "click" are accompanied when the protective cover is mounted in place. The sealant 1623 may be coated on the upper and lower inner walls of the inner wall of the fixing hole 1622 in a rectangular parallelepiped form (as shown in fig. 15), or may be coated in a ring-shaped rubber ring or other forms along the inner wall of the fixing hole 1622. It can be understood that after the protective cover 16 is covered on the lens barrel 12, under the condition that the protective side walls 162 are not expanded by applying an external force, the protective cover 16 can be covered on the lens barrel 12 all the time due to the limiting function of the fixing protrusions 127, so that the protective top wall 161 prevents the diffractive optical element 15 from being released from the lens barrel 12.

Referring to fig. 6, a first rubber ring 151 is formed between the protection top wall 161 and the diffractive optical element 15. The first rubber ring 151 may be made of a waterproof material such as a rubber ring, so that a sealed space is formed between the protective ceiling wall 161 and the diffractive optical element 15. The first rubber ring 151 may also be formed by gluing, so that the protective top wall 161 and the diffractive optical element 15 are bonded together, and the diffractive optical element 15 is more firmly mounted. Two kinds of formation modes of above first rubber ring 151 can both make and form sealed environment between protection roof 161 and the diffractive optical element 15, effectively avoid after the laser projection module 10 feed liquor, liquid is attached to the exit surface of diffractive optical element 15, leads to zero order laser energy reinforcing to endanger eye safety.

Referring to fig. 6, in one embodiment, the diffractive optical element 15 is mounted on the position-limiting surface 1232, and a second rubber ring 152 is formed between the diffractive optical element 15 and the position-limiting surface 1232. The second rubber ring 152 may be bonded by glue, the second rubber ring 152 may be formed by dispensing around the limiting surface 1232 and then connecting the two rubber rings 152, or the glue may be coated on the limiting surface 1232 to form a circle to form the second rubber ring 152, and the formed second rubber ring 152 enables the diffractive optical element 15 and the lens barrel 12 to be bonded together, so that the diffractive optical element 15 is more firmly mounted. In addition, the second rubber ring 152 may also be a rubber ring, a silicone ring, or another waterproof rubber ring, and at this time, the second rubber ring 152 is disposed between the diffractive optical element 15 and the limiting surface 1232 to have a good waterproof function. Two kinds of formation modes of above second rubber ring 152 can both make and form sealed environment between spacing face 1232 and the diffractive optical element 15, effectively avoid after the laser projection module 10 feed liquor, liquid is attached to the incident surface of diffractive optical element 15, leads to zero order laser energy reinforcing harm eye safety.

Referring to fig. 6 and 10, the limiting surface 1232 has a glue accommodating groove 1233 formed thereon, and the second rubber ring 152 is formed in the glue accommodating groove 1233. When the diffractive optical element 15 is installed, glue can be firstly dispensed in the glue accommodating groove 1233, the diffractive optical element 15 is installed on the limiting surface 1232 after the glue dispensing is finished, under the bonding action of the glue, the combination of the diffractive optical element 15 and the limiting protrusion 123 is reliable, and the glue can be accommodated in the glue accommodating groove 1233, so that the glue is prevented from overflowing from the glue accommodating groove 1233 and flowing onto the diffraction structure of the diffractive optical element 15. The second rubber ring 152 may also be a silicone ring or other waterproof rubber ring made of waterproof material.

Referring to fig. 7, in another embodiment, the first surface 124 of the lens barrel 12 coincides with the limiting surface 1232, and the top wall 161 is protected against the diffractive optical element 15. The diffractive optical element 15 is attached to the first surface 124, and a second rubber ring 152 is formed between the diffractive optical element 15 and the first surface 124.

Referring to fig. 7, the lens barrel 12 further has a glue accommodating groove 1233 formed on the first surface 124, and the second rubber ring 153 is formed in the glue accommodating groove 1233. When the diffractive optical element 15 is mounted, glue can be dispensed in the glue accommodating groove 1233, the diffractive optical element 15 is mounted on the first surface 124 after the glue dispensing is finished, the diffractive optical element 15 is bonded on the first surface 124 under the bonding action of the glue, and the glue can be accommodated in the glue accommodating groove 1233, so that the glue is prevented from overflowing from the glue accommodating groove 1233 and flowing onto the diffractive structure of the diffractive optical element 15. At this time, the protective ceiling wall 161 abuts against the diffractive optical element 15, and the protective ceiling wall 161 and the stopper projection 123 sandwich the diffractive optical element 15. In this way, the diffractive optical element 15 is more easily mounted on the stopper projection 123.

In summary, in the electronic device 1000 according to the embodiment of the present disclosure, the diffractive optical element 15 is located between the limiting protrusion 123 and the protective top wall 161, and the fixing protrusion 127 can extend into the fixing hole 1622 to fixedly connect the protective cover 16 and the lens barrel 12, so that the diffractive optical element 15 cannot fall off along the light emitting direction, thereby preventing the laser from being emitted without passing through the diffractive optical element 15, protecting the user, and improving the safety. In addition, the protective ceiling wall 161 and the diffractive optical element 15 are formed with the first rubber ring 151, so that a sealed environment is formed between the protective ceiling wall 161 and the diffractive optical element 15, and the diffractive optical element 15 and the limiting surface 1232 are formed with the second rubber ring 152, so that the diffractive optical element 15 is bonded to the limiting surface 1232, the installation of the diffractive optical element 15 is more secure, and a sealed environment is formed between the limiting surface 1232 and the diffractive optical element 15. The sealant 1623 prevents the fixing protrusion 127 from opening the protection sidewall 162, so that the protection sidewall 162 is not deformed, and the liquid is prevented from entering the protection sidewall 162. Therefore, the first rubber ring 151, the second rubber ring 152 and the sealant 1623 can effectively prevent liquid from being attached to the surface of the diffractive optical element 15 after the liquid of the laser projection module 10 is fed, so that the energy of zero-order laser is enhanced and the safety of human eyes is harmed.

Referring to fig. 6 and 7, in some embodiments, the glue accommodating groove 1233 and the light passing hole 1231 are spaced apart from each other, so as to prevent the glue in the glue accommodating groove 1233 from flowing into the light passing hole 1231 and affecting the propagation of the laser. The glue accommodating grooves 1233 may be multiple in number, and the glue accommodating grooves 1233 are uniformly distributed around the periphery of the light passing hole 1231 by taking the axis of the light passing hole 1231 as the center, so that when the diffractive optical element 15 is bonded to the limiting protrusion 123, the bonding force is uniform and is not easy to fail. The glue accommodating groove 1233 may be an annular continuous groove, and specifically may be an annular square groove, an annular rectangular groove, or an annular T-shaped groove or other forms.

Referring to fig. 9 and 15, in some embodiments, the protection sidewall 162 includes a plurality of protection sub-sidewalls 1621, and the protection sub-sidewalls 1621 are connected end to end. At least two protection son lateral walls 1621 are formed with fixed orifices 1622, and the quantity of fixed arch 127 is the same and the position corresponds with fixed orifice 1622's quantity, and every fixed arch 127 stretches into corresponding fixed orifice 1622 in, and fixed orifice 1622 position all is scribbled sealed glue 1623. Thus, the fixing protrusions 127 are matched with the fixing holes 1622 and are glued together, so that the protective cover 16 is not easy to separate from the lens barrel 12 under the action of external force, and the reliability of covering the lens barrel 12 with the protective cover 16 is improved. Specifically, at least two opposite protection sub-side walls 1621 are formed with fixing holes 1622, and correspondingly, at least two opposite positions of the barrel side wall 122 are formed with fixing protrusions 127. Thus, if the protection side wall 162 needs to be stretched to take out the protection cover 16, at least two opposite protection sub side walls 1621 need to be stretched to two sides, that is, at least pulling force needs to be applied from two sides, so as to avoid the situation that the protection side wall 162 deforms under the action of the pulling force at one side to cause the matching failure of the fixing protrusion 127 and the fixing hole 1622, and further improve the reliability of the protection cover 16 covering the lens barrel 12.

Referring to fig. 9, in some embodiments, the fixing protrusion 127 is formed with a guiding inclined surface 1271, and the guiding inclined surface 1271 is gradually away from the barrel sidewall 122 along the direction in which the protective cover 16 is inserted into the barrel 12. The protective cover 16 covers the lens barrel 12, and the protective sidewall 162 abuts against the guiding inclined surface 1271. Since the guide slope 1271 is inclined with respect to the barrel side wall 122, in the process of abutting the protection side wall 162 against the guide slope 1271, the abutting force of the guide slope 1271 on the protection side wall 162 gradually and continuously increases, the deformation amount of the protection side wall 162 also continuously increases, and the protection cover 16 is easily covered in the barrel 12.

Referring to fig. 16, the laser projection module 10 may further include a protective cover 17 and a cover 18. The protective sleeve 17 and the cover plate 18 are combined to form a containing space, specifically, the combination of the protective sleeve 17 and the cover plate 18 may be: the lower surface of the cover plate 18 is directly bonded to the upper surface of the protective cover 17 by glue. The protective cover 16 is accommodated in the accommodating space, i.e., the protective sleeve 17 is sleeved on the protective cover 16. Protective top wall 161 is bonded to cover 18 and the outer surface of protective side wall 162 is bonded to the inner surface of protective sleeve 17. Specifically, the cover plate 18 is disposed in the light emitting direction of the laser projection module 10, and the laser emitted by the laser projection module 10 passes through the cover plate 18 and then is emitted. The protective sleeve 17 may be a transparent silicone sleeve or other protective sleeve made of waterproof material. The protective sleeve 17 and the cover plate 18 form a containing space, and the protective cover 16 is contained in the containing space, so that the liquid can be effectively prevented from entering from the protective side wall 162, or the laser emitted by the laser projection module 10 is directly emitted to human eyes due to the fracture of the collimating element 14 and/or the diffractive optical element 15, thereby avoiding the safety of human eyes. The cover plate 18 may be glass or other light transmissive material. At this moment, the cover plate 18 and the protective sleeve 17 form a closed accommodating space to accommodate the protective cover 16, so that liquid does not flow in from the top of the protective top wall 161, and the problem that the safety of human eyes is harmed due to the enhancement of zero-order laser energy caused by the liquid inlet of the laser projection module 10 can be further avoided.

In other embodiments, the cover 18 may also be the same cover as a glass cover on a display of the electronic device 1000. When the electronic device 1000 falls, the edge of the cover plate 18 is often cracked first, and when the edge position of the cover plate 18 is detected to be cracked, it can be further determined that the laser projection module 10 is also cracked, and at this time, the processor 30 can timely turn off the light source 13 or reduce the emission power of the light source 13, so as to avoid that the emitted laser energy is too large and harms human eyes.

In the description herein, reference to the description of 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 application. 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 application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims (14)

1. The laser projection module is characterized by comprising a light source, a collimation element and a diffraction optical element, wherein the collimation element and the diffraction optical element are sequentially arranged on a light path of the light source;

the laser projection module further comprises a lens barrel and a protective cover, the lens barrel comprises a lens barrel side wall, a limiting bulge protruding inwards from the lens barrel side wall and a fixing bulge protruding outwards from the lens barrel side wall, and the diffractive optical element is mounted on the limiting bulge; the protective cover comprises a protective top wall and a protective side wall extending from the protective top wall, a light through hole is formed in the protective top wall and corresponds to the diffractive optical element, a fixing hole is formed in the protective side wall, the protective cover covers the lens barrel, the fixing protrusion extends into the fixing hole, the diffractive optical element is located between the limiting protrusion and the protective top wall, and a first rubber ring is further formed between the diffractive optical element and the protective top wall.

2. The laser projection module of claim 1, further comprising a substrate assembly, wherein the side wall of the lens barrel is disposed on the substrate assembly and forms a receiving cavity together with the substrate assembly, the light source is disposed on the substrate assembly, the collimating element is received in the receiving cavity, the lens barrel comprises a first surface and a second surface opposite to each other, the second surface is combined with the substrate assembly, the limiting protrusion is located between the first surface and the second surface, and the top protection wall abuts against the first surface.

3. The laser projection module of claim 2, wherein the limiting protrusion comprises a limiting surface, the diffractive optical element is mounted on the limiting surface, and a second rubber ring is formed between the diffractive optical element and the limiting surface.

4. The laser projection module of claim 3, wherein the lens barrel is formed with a glue receiving groove on the limiting surface, and the second rubber ring is formed in the glue receiving groove.

5. The laser projection module of claim 1, further comprising a substrate assembly, wherein the side wall of the lens barrel is disposed on the substrate assembly and forms a receiving cavity together with the substrate assembly, the light source is disposed on the substrate assembly, the collimating element is received in the receiving cavity, the lens barrel comprises a first surface and a second surface opposite to each other, the second surface is combined with the substrate assembly, the first surface coincides with the upper surface of the limiting protrusion, and the top protection wall abuts against the diffractive optical element.

6. The laser projection module of claim 5, wherein the diffractive optical element is mounted on the first face with a second rubber ring formed therebetween.

7. The laser projection module of claim 6, wherein the lens barrel is formed with a glue receiving groove on the first surface, and the second rubber ring is formed in the glue receiving groove.

8. The laser projection module of claim 1, wherein a sealant is formed between the joints of the fixing protrusions and the fixing holes.

9. The laser projection module of claim 8, wherein the protection sidewall comprises a plurality of protection sub-sidewalls connected end to end in sequence, at least two protection sub-sidewalls are formed with the fixing holes, the number of the fixing protrusions is the same as the number of the fixing holes, the fixing protrusions correspond to the fixing holes in position, each fixing protrusion extends into the corresponding fixing hole, and the positions of the fixing holes are coated with the sealant.

10. The laser projection module of claim 9, wherein at least two opposing sidewalls of the protector have the fixing holes formed therein.

11. The laser projection module of claim 1, wherein the fixing protrusion forms a guiding inclined surface, the guiding inclined surface is gradually away from the side wall of the lens barrel along a direction in which the protection cover is sleeved into the lens barrel, and the protection side wall is abutted against the guiding inclined surface in a process that the protection cover is covered on the lens barrel.

12. The laser projection module of claim 1, further comprising a protection cover, wherein the protection cover and the cover plate form a receiving space, the protection cover is received in the receiving space, the protection top wall is combined with the cover plate, and the protection side wall is combined with the protection cover.

13. A depth camera, comprising:

the laser projection module of any of claims 1-12;

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.

14. An electronic device, comprising:

the depth camera of claim 13; and

a housing coupled with the depth camera.

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