Laser projector, camera assembly, and electronic device

Abstract

The present application provides a laser projector, a camera assembly, and an electronic device. The laser projector includes: a substrate; a laser light source assembly configured to emit a first laser with a first wavelength and a second laser with a second wavelength, where the first wavelength is not equal to the second wavelength; a diffraction assembly configured to diffract the laser to form a projection pattern, the diffraction assembly including a first diffractive optical element for diffracting the first laser and a second diffractive optical element for diffracting the second laser; a switching assembly configured to make the first diffractive optical element and the second diffractive optical element movable relative to the laser light source assembly; and a control assembly configured to control the first laser and the second laser not to be emitted simultaneously, and the control assembly controls the movement of the switching assembly so that when the laser light source assembly emits the first / second laser, the first / second diffractive optical element moves onto the beam path of the laser, and the second / first diffractive optical element moves out of the beam path of the laser.

Description

Technical Field

[0001] The present application relates to the field of imaging technologies, and in particular, to a laser projector, a camera assembly having the same, and an electronic device. Background Art

[0002] Infrared cameras are commonly used for day and night monitoring, and their concealment makes it possible to obtain the most authentic image materials, video evidence, or real-time monitoring images.

[0003] The infrared rays that an infrared camera can receive are distributed with wavelengths of 830nm - 960nm. Generally, using infrared rays with shorter wavelengths can enhance the image capture ability of the camera, but it will cause the red glow phenomenon. Especially at night, the visible red light emitted will reduce the concealment of the camera. While using infrared rays with longer wavelengths can effectively avoid this problem, but it will sacrifice the clarity of the camera.

[0004] Therefore, it is necessary to provide a laser projector, a camera assembly having the same, and an electronic device to at least partially solve the above problems. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further elaborated in the Detailed Description section. The Summary of the Invention section of the present application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] The first aspect of the present application provides a laser projector, which includes:

[0007] A substrate;

[0008] A laser light source assembly disposed on the substrate for emitting laser light, the laser light including first laser light with a first wavelength and second laser light with a second wavelength, wherein the first wavelength is not equal to the second wavelength, and the laser light source assembly includes a first light emitting portion for emitting the first laser light and a second light emitting portion for emitting the second laser light;

[0009] A diffraction assembly for diffracting the laser light to form a projection pattern, the diffraction assembly including a first diffractive optical element for diffracting the first laser light and a second diffractive optical element for diffracting the second laser light;

[0010] A switching assembly, the switching assembly is disposed on the substrate and connected to the diffraction assembly, and the switching assembly is movable relative to the laser light source assembly so that the first diffractive optical element and the second diffractive optical element are movable relative to the laser light source assembly; and

[0011] A control assembly, the control assembly is respectively coupled to the diffraction assembly and the switching assembly,

[0012] Among them, the control component is configured to control the first laser and the second laser not to emit simultaneously, and the control component controls the switching component to move so that:

[0013] When the laser light source component emits the first laser, the first diffractive optical element moves onto the beam path of the laser, and the second diffractive optical element moves out of the beam path of the laser;

[0014] When the laser light source component emits the second laser, the second diffractive optical element moves onto the beam path of the laser, and the first diffractive optical element moves out of the beam path of the laser.

[0015] In this application, the first laser and the second laser have different wavelengths. The first diffractive optical element and the second diffractive optical element are respectively used to diffract the first laser and the second laser, so that the laser projector can emit two diffracted lasers. The control component controls the laser light source component to emit at most one wavelength of laser at the same time, and controls the switching component to move, so that the diffractive optical element corresponding to the laser of the wavelength in the diffractive component connected to the switching component is located on the beam path of the laser of the wavelength, so that the laser is diffracted by the diffractive optical element. When the control component controls the emission of the laser of another wavelength, the switching component is controlled to move at the same time. Similarly, the laser of the other wavelength is diffracted by its corresponding diffractive optical element, so as to achieve the effect that the laser projector emits diffracted lasers of different wavelengths at different times.

[0016] Optionally, the control component of the laser projector controls the first light emitting part and the second light emitting part not to emit light simultaneously.

[0017] In this application, the control component realizes that the projector emits diffracted lasers of different wavelengths at different times by controlling the first light emitting part and the second light emitting part not to emit light simultaneously.

[0018] Optionally, one of the first wavelength and the second wavelength of the laser projector is 840nm to 860nm, and the other of the first wavelength and the second wavelength is 930nm to 950nm.

[0019] In this application, the laser with a wavelength of 840mm to 860nm has a higher radiation intensity and higher brightness; the laser with a wavelength of 930nm to 950nm has an insignificant red glow phenomenon, so that the laser projector can be applied to two different usage scenarios according to the characteristics of the lasers of the two wavelengths.

[0020] Optionally, the control component of the laser projector controls one of the first light emitting part and the second light emitting part to emit laser according to a user instruction; or

[0021] The laser projector further includes a light sensor for sensing the ambient brightness. The light sensor is coupled to a control component, and the control component controls one of the first light emitting part and the second light emitting part to emit laser according to time information and / or ambient brightness information.

[0022] In this application, for the start, stop and switching of the first laser and the second laser emitted by the laser light source assembly, the control component can achieve manual control according to a user instruction, or can achieve automatic control according to ambient brightness and / or time information to meet the usage requirements of the laser projector during the day and at night.

[0023] Optionally, the laser projector is configured such that:

[0024] The control component controls the switching component to move so that the first diffractive optical element moves between a first position and a second position along a moving direction. Wherein, at the first position, the first diffractive optical element is located on the light beam path of the laser, and at the second position, the first diffractive optical element deviates from the light beam path of the laser;

[0025] The control component controls the switching component to move so that the second diffractive optical element moves between a third position and a fourth position along the moving direction. Wherein, at the third position, the second diffractive optical element is located on the light beam path of the laser, and at the fourth position, the second diffractive optical element deviates from the light beam path of the laser.

[0026] Wherein, the moving direction is perpendicular to the optical axis of the laser.

[0027] In this application, the control component controls the switching component to switch the diffractive optical element located on the laser light beam path so that when one diffractive optical element diffracts its corresponding laser, the other diffractive optical element is not on the laser light beam path. Wherein, the moving direction is perpendicular to the optical axis of the laser, which is beneficial to simplifying the structure of the switching component.

[0028] Optionally, when the first diffractive optical element is at the first position, the optical axis of the first light emitting part deviates from the optical axis of the first diffractive optical element by no more than 5 μm;

[0029] When the second diffractive optical element is at the third position, the optical axis of the second light emitting part deviates from the optical axis of the second diffractive optical element by no more than 5 μm.

[0030] In this application, when the diffractive optical element is located on the light beam path of the corresponding laser, its optical axis can slightly deviate from the optical axis of the laser within a range of 5 μm to allow a small deviation in the moving position of the switching component on the basis of not affecting the light emitting effect of the laser projector.

[0031] Optionally, the diffractive component of the laser projector includes a carrier seat, and the first diffractive optical element and the second diffractive optical element are arranged on the carrier seat.

[0032] The switching component is connected to the carrier seat, and is used to make the carrier seat movable relative to the laser light source component along the moving direction.

[0033] In this application, the switching component drives the movement of the carrier seat to make the diffraction component thereon move perpendicular to the laser optical axis.

[0034] Optionally, the first diffractive optical element and the second diffractive optical element of the laser projector are set on respective carrier seats, or the first diffractive optical element and the second diffractive optical element are set on the same carrier seat.

[0035] In this application, the first diffractive optical element and the second diffractive optical element can be respectively set on different carrier seats, or can be set on the same carrier seat, and can be flexibly set according to requirements such as the shape and size of the laser projector.

[0036] Optionally, the switching component of the laser projector includes:

[0037] A bracket, the bracket is set on the substrate, wherein the carrier seat is connected to the bracket and is movable relative to the bracket along the moving direction; and

[0038] A driving device, the driving device is coupled to the control component, the driving device is set on the bracket and is movable relative to the bracket to drive the carrier seat to move relative to the bracket.

[0039] In this application, the structure of the switching component is simple.

[0040] Optionally, the driving device of the laser projector includes a push-pull electromagnet, the push-pull electromagnet includes an electromagnet main body and a traction rod, the traction rod is telescopable relative to the electromagnet main body along the moving direction, wherein the electromagnet main body is set on the bracket and the traction rod is connected to the carrier seat.

[0041] In this application, the bracket provides a supporting force for the electromagnet main body connected thereto, and the electromagnet can drive the traction rod to telescopically move relative to the electromagnet main body by magnetic force. Also, because the traction rod is connected to the carrier seat and the carrier seat is connected to the diffraction component, and both the bracket and the laser light source component are set on the substrate and are relatively stationary, the electromagnet can drive the diffraction component to move relative to the laser light source component by magnetic force.

[0042] Optionally, the driving device of the laser projector includes:

[0043] A motor, the motor is set on the bracket;

[0044] A gear, the gear is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft; and

[0045] A rack, the rack is set on the carrier seat, the rack extends along the moving direction, and the rack meshes with the gear.

[0046] In the present application, the bracket provides a supporting force for the motor disposed thereon, and the motor can drive the gear meshing with the rack to rotate synchronously with the output shaft. Also, since the rack is fixed to the carrier and the carrier is connected to the diffraction component, and both the bracket and the laser light source component are disposed on the substrate and are relatively stationary, the motor can drive the diffraction component to move relative to the laser light source component through the rack meshing with the gear.

[0047] Optionally, the driving device of the laser projector includes:

[0048] A motor, which is disposed on the bracket;

[0049] A synchronous pulley assembly, which is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft; and

[0050] A synchronous belt, which is connected to the carrier and wound around the synchronous pulley assembly in a closed manner,

[0051] wherein the synchronous belt is driven to move along the moving direction.

[0052] In the present application, the bracket provides a supporting force for the motor disposed thereon, and the motor can drive the synchronous pulley assembly to rotate synchronously with the output shaft, and the synchronous pulley assembly drives the synchronous belt to roll synchronously. Also, since the synchronous belt is connected to the carrier and the carrier is connected to the diffraction component, and both the bracket and the laser light source component are disposed on the substrate and are relatively stationary, the motor can drive the synchronous belt to roll through the synchronous pulley assembly so that the diffraction component moves relative to the laser light source component.

[0053] Optionally, the laser projector further includes:

[0054] A second guiding member, which is disposed on the bracket and extends along the moving direction, and

[0055] A first guiding member, which is disposed on the carrier, and the first guiding member is connected to the second guiding member and is movable relative to the second guiding member along the moving direction.

[0056] In the present application, when the carrier moves relative to the bracket, it is guided by the first guiding member and the second guiding member in the moving direction, so that the movement of the carrier is smooth, stable, and the degree of position deviation is small.

[0057] Optionally, one of the first guiding member and the second guiding member of the laser projector is configured as a slide rail, and the other of the first guiding member and the second guiding member is configured as a sliding groove, and the sliding groove accommodates the slide rail.

[0058] In the present application, each position where the carrier moves relative to the bracket is guided by the slide rail and the sliding groove, so that the movement trajectory of the carrier is smoother.

[0059] Optionally, the laser projector further includes a protective cover, which is arranged on the bracket, and the protective cover and the laser light source assembly are respectively located on both sides of the diffraction assembly along the extension direction of the optical axis.

[0060] In this application, the protective cover provides protection for the diffraction assembly, switching assembly, laser light source assembly and other structures of the laser projector.

[0061] Optionally, the laser projector further includes a collimating mirror, which is arranged on the bracket and is located between the laser light source assembly and the diffraction assembly along the extension direction of the optical axis.

[0062] In this application, the collimating mirror is used to collimate the first laser and the second laser.

[0063] Optionally, the optical axis of the first light-emitting part of the laser projector deviates from the optical axis of the collimating mirror by no more than 5 μm, and the optical axis of the second light-emitting part deviates from the optical axis of the collimating mirror by no more than 5 μm.

[0064] In this application, when the collimating mirror is located on the beam paths of the first laser and the second laser, its optical axis can deviate slightly from the optical axis of the first light-emitting part within a range of 5 μm and deviate slightly from the optical axis of the second light-emitting part within a range of 5 μm, so as to collimate the first laser and the second laser with the collimating mirror on the basis of not affecting the light-emitting effect of the laser projector.

[0065] Optionally, the first diffractive optical element and the second diffractive optical element are arranged on their respective carriers, and the two carriers are arranged along the optical axis direction of the laser;

[0066] The driving device includes:

[0067] A motor, which is arranged on the bracket;

[0068] A gear, which is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft. The axis of the gear is perpendicular to the optical axis and the moving direction of the laser; and

[0069] Two racks, which are respectively arranged on the two carriers, extend along the moving direction, and are engaged with the gear on both sides of the gear along the optical axis direction of the laser.

[0070] In this application, compared with the solution in which the first diffractive optical element and the second diffractive optical element are arranged on the same carrier, arranging the first diffractive optical element and the second diffractive optical element on their respective carriers can reduce the size of the bracket along the moving direction.

[0071] Optionally, the first light-emitting part and the second light-emitting part of the laser projector are vertical cavity surface emitting lasers.

[0072] In this application, the vertical cavity surface emitting laser is selected as the laser light source, which has a small divergence angle and is easy to realize a two-dimensional array.

[0073] Optionally, the first light-emitting part and the second light-emitting part of the laser projector are arranged in a direction perpendicular to the optical axis of the laser.

[0074] Alternatively or optionally, the second light-emitting part of the laser projector includes two parts spaced apart from each other in a direction perpendicular to the optical axis of the laser, and the two parts are respectively located on both sides of the first light-emitting part.

[0075] Alternatively or optionally, the first light-emitting part and the second light-emitting part of the laser projector are alternately arranged with each other in the length direction and / or the width direction, where the length direction is perpendicular to the width direction, the length direction is perpendicular to the optical axis of the laser, and the width direction is perpendicular to the optical axis of the laser.

[0076] In this application, the arrangement manner of the first light-emitting part and the second light-emitting part can be flexibly selected.

[0077] Optionally, the first light-emitting part of the laser projector is composed of a plurality of single-hole vertical cavity surface emitting lasers, and the second light-emitting part is composed of a plurality of single-hole vertical cavity surface emitting lasers. Further, the plurality of single-hole vertical cavity surface emitting lasers of the first light-emitting part are arranged in a plurality of columns at a first predetermined pitch interval along the length direction, and the plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a second predetermined pitch interval along the width direction;

[0078] The plurality of single-hole vertical cavity surface emitting lasers of the second light-emitting part are arranged in a plurality of columns at a third predetermined pitch interval along the length direction, and the plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a fourth predetermined pitch interval along the width direction.

[0079] Furthermore, one column of the single-hole vertical cavity surface emitting lasers of the second light-emitting part is arranged between any two adjacent columns of the single-hole vertical cavity surface emitting lasers of the first light-emitting part, and one column of the single-hole vertical cavity surface emitting lasers of the first light-emitting part is arranged between any two adjacent columns of the single-hole vertical cavity surface emitting lasers of the second light-emitting part; or

[0080] One row of the single-hole vertical cavity surface emitting lasers of the second light-emitting part is arranged between any two adjacent rows of the single-hole vertical cavity surface emitting lasers of the first light-emitting part, and one row of the single-hole vertical cavity surface emitting lasers of the first light-emitting part is arranged between any two adjacent rows of the single-hole vertical cavity surface emitting lasers of the second light-emitting part.

[0081] According to this application, the first light-emitting part and the second light-emitting part can adopt single-hole vertical cavity surface emitting lasers. The first light-emitting part and the second light-emitting part are each arranged in a two-dimensional lattice manner, and then the alternate arrangement in one direction is realized by means of row interspersing or column interspersing.

[0082] Alternatively, in two adjacent columns of the first light-emitting part, the single-hole vertical cavity surface emitting lasers with the same row number are staggered from each other in the width direction, and in two adjacent columns of the second light-emitting part, the single-hole vertical cavity surface emitting lasers with the same row number are staggered from each other in the width direction;

[0083] One column of the single-hole vertical cavity surface emitting lasers of the second light-emitting part is provided between the single-hole vertical cavity surface emitting lasers of any two columns of the first light-emitting part with a column number difference of 2, and one column of the single-hole vertical cavity surface emitting lasers of the first light-emitting part is provided between the single-hole vertical cavity surface emitting lasers of any two columns of the second light-emitting part with a column number difference of 2;

[0084] One row of the single-hole vertical cavity surface emitting lasers of the second light-emitting part is provided between the single-hole vertical cavity surface emitting lasers of any two rows of the first light-emitting part with a row number difference of 2, and one row of the single-hole vertical cavity surface emitting lasers of the first light-emitting part is provided between the single-hole vertical cavity surface emitting lasers of any two rows of the second light-emitting part with a row number difference of 2.

[0085] According to the present application, the first light-emitting part and the second light-emitting part are each arranged in a two-dimensional lattice manner, and then the alternating arrangement in two directions is realized by the simultaneous interspersion of rows and columns.

[0086] Optionally, the first light-emitting part is composed of a plurality of multi-hole vertical cavity surface emitting lasers, and the second light-emitting part is composed of a plurality of multi-hole vertical cavity surface emitting lasers.

[0087] Furthermore, each of the plurality of multi-hole vertical cavity surface emitting lasers of the first light-emitting part constitutes a column of the first light-emitting part, and a plurality of columns of the first light-emitting part are arranged at intervals in the length direction at a first preset interval,

[0088] Each of the plurality of multi-hole vertical cavity surface emitting lasers of the second light-emitting part constitutes a column of the second light-emitting part, and a plurality of columns of the second light-emitting part are arranged at intervals in the length direction at a second preset interval,

[0089] One column of the multi-hole vertical cavity surface emitting lasers of the second light-emitting part is provided between any two adjacent columns of the multi-hole vertical cavity surface emitting lasers of the first light-emitting part, and one column of the multi-hole vertical cavity surface emitting lasers of the first light-emitting part is provided between any two adjacent columns of the multi-hole vertical cavity surface emitting lasers of the second light-emitting part;

[0090] Or

[0091] Each of the plurality of multi - hole vertical cavity surface emitting lasers of the first light emitting part forms a row of the first light emitting part, and a plurality of rows of the first light emitting part are arranged at intervals in the width direction with a third preset interval.

[0092] Each of the plurality of multi - hole vertical cavity surface emitting lasers of the second light emitting part forms a row of the second light emitting part, and a plurality of rows of the second light emitting part are arranged at intervals in the width direction with a fourth preset interval.

[0093] One row of the multi - hole vertical cavity surface emitting lasers of the second light emitting part is arranged between any two adjacent rows of the multi - hole vertical cavity surface emitting lasers of the first light emitting part, and one row of the multi - hole vertical cavity surface emitting lasers of the first light emitting part is arranged between any two adjacent rows of the multi - hole vertical cavity surface emitting lasers of the second light emitting part.

[0094] According to the present application, the first light emitting part and the second light emitting part can adopt multi - hole vertical cavity surface emitting lasers, and realize the alternating arrangement in one direction by means of row interspersing or column interspersing.

[0095] Optionally, the first light emitting part and the second light emitting part of the laser projector are edge - emitting lasers.

[0096] In the present application, the laser light source can select an edge - emitting laser, which has a small volume and can emit stable coherent light.

[0097] Optionally, the laser projector further includes a reflector, which is arranged on the substrate and located between the first light emitting part and the second light emitting part, and is used to reflect the first laser and the second laser to the diffractive optical element.

[0098] Furthermore, the cross - section of the reflector of the laser projector parallel to the optical axis of the diffractive optical element is configured as an isosceles right - angled triangle, and two right - angled sides correspond to two reflecting surfaces, which are respectively used to reflect the first laser and the second laser.

[0099] In the present application, a reflector is used to reflect the lasers of the first light emitting part and the second light emitting part to the diffractive optical element. The reflector is used to adjust the optical path and ensure that the incident angle of the laser is equal to the exit angle of the reflector.

[0100] Optionally, the reflector of the laser projector is configured as a total reflection mirror.

[0101] In the present application, configuring the reflector as a total reflection mirror can minimize the energy loss of the edge - emitting laser.

[0102] Optionally, the laser projector further includes two collimating mirrors, which are arranged on the substrate and are respectively used to collimate the first laser and the second laser, and the reflector is located in the middle of the two collimating mirrors.

[0103] Furthermore, the optical axes of the two collimating mirrors of the laser projector are not parallel to the optical axis of the first diffractive optical element and the optical axis of the second diffractive optical element.

[0104] In the present application, the laser can be collimated by the collimating mirror first, and then the collimated laser is diffracted.

[0105] A second aspect of the present application provides a camera assembly, which includes:

[0106] The laser projector according to any one of the above technical solutions of the present application;

[0107] An image collector, configured to collect a laser image formed by the projection pattern of the laser projector; and

[0108] A processor, configured to process the laser image to obtain a depth image.

[0109] According to the present application, the first laser and the second laser have different wavelengths, and the first diffractive optical element and the second diffractive optical element are respectively configured to diffract the first laser and the second laser, so that the camera assembly can emit two diffracted lasers. The control assembly controls the laser light source assembly to emit at most one wavelength of laser at the same time, and controls the switching assembly to move, so that the diffractive optical element corresponding to the laser of the wavelength in the diffractive assembly connected to the switching assembly is located on the light beam path of the laser of the wavelength, so that the laser is diffracted by the diffractive optical element. When the control assembly controls the emission of the laser of another wavelength, the switching assembly is controlled to move at the same time. Similarly, the laser of the other wavelength is diffracted by its corresponding diffractive optical element, so as to achieve the effect that the camera assembly emits diffracted lasers of different wavelengths at different times.

[0110] Optionally, the processor includes a control assembly.

[0111] According to the present application, the camera assembly has a compact structure.

[0112] A third aspect of the present application provides an electronic device, which includes:

[0113] A housing; and

[0114] The camera assembly according to any one of the above technical solutions of the present application, and the camera assembly is disposed on the housing and exposed from the housing to obtain a depth image.

[0115] According to the present application, the first laser and the second laser have different wavelengths. The first diffractive optical element and the second diffractive optical element are respectively used to diffract the first laser and the second laser, so that the electronic device can emit two diffracted lasers. The control component controls the laser light source component to emit at most one wavelength of laser at the same time, and controls the switching component to move, so that the diffractive optical element corresponding to the laser of the wavelength in the diffractive component connected to the switching component is located on the beam path of the laser of the wavelength, so that the laser is diffracted by the diffractive optical element. When the control component controls the emission of the laser of another wavelength, the switching component is controlled to move at the same time. Similarly, the laser of the other wavelength is diffracted by its corresponding diffractive optical element, so as to achieve the effect that the electronic device emits diffracted lasers of different wavelengths at different times.

[0116] Optionally, the electronic device is a monitoring device.

[0117] According to the present application, the monitoring device emits diffracted lasers of different wavelengths at different times, so that the phenomenon of red glow can be avoided by selecting the wavelength range of the laser. Description of the Drawings

[0118] The following drawings of the present application are used as part of the present invention to understand the present application. The embodiments and descriptions of the present application are shown in the drawings to explain the principle of the present application. In the drawings:

[0119] Figure 1 is a schematic external view of a laser projector according to a first embodiment of the present application;

[0120] Figure 2 is Figure 1 an exploded schematic view of the laser projector shown;

[0121] Figure 3 is Figure 1 a schematic bottom view of the laser projector shown, where the protective cover is omitted to show the internal structure, and the first diffractive optical element is located on the beam path of the laser;

[0122] Figure 4 is Figure 3 a schematic side sectional view of the laser projector shown;

[0123] Figure 5 is Figure 1 a schematic bottom view of the laser projector shown, where the protective cover is omitted to show the internal structure, and the second diffractive optical element is located on the beam path of the laser;

[0124] Figure 6 is Figure 5 a schematic side sectional view of the laser projector shown;

[0125] Figure 7 Exploded schematic view of a laser projector according to a second embodiment of the present application;

[0126] Figure 8 Exploded schematic view of a laser projector according to a third embodiment of the present application;

[0127] Figure 9 Is Figure 8 An attached view schematic of the laser projector shown, where the protective cover is omitted to show the internal structure, and a first diffractive optical element is located on the beam path of the laser;

[0128] Figure 10 Is Figure 9 A side cross-sectional view schematic of the laser projector shown;

[0129] Figure 11 Is Figure 8 An attached view schematic of the internal structure of the laser projector shown, where the protective cover is omitted to show the internal structure, and a second diffractive optical element is located on the beam path of the laser;

[0130] Figure 12 Is Figure 11 A side cross-sectional view schematic of the laser projector shown;

[0131] Figure 13 Exploded schematic view of a laser projector according to a fourth embodiment of the present application;

[0132] Figures 14 to 16 Optical path schematic of a laser projector according to a specific embodiment of the present application, where a first light emitting part and a second light emitting part adopt vertical cavity surface emitting lasers;

[0133] Figure 17 Is Figures 14 to 16 A top view schematic of the laser light source assembly in ;

[0134] Figure 18 Optical path schematic of a laser projector according to another specific embodiment of the present application, where a first light emitting part and a second light emitting part adopt vertical cavity surface emitting lasers;

[0135] Figures 19 to 21 Is Figure 18 A top view schematic of the laser light source assembly in ;

[0136] Figure 22 Is Figure 21 A schematic diagram of a variant embodiment of the laser light source assembly in ;

[0137] Figure 23Schematic diagram of the optical path of a laser projector according to another specific embodiment of the present application, where the first light-emitting part and the second light-emitting part adopt edge-emitting lasers;

[0138] Figure 24 Schematic diagram of the optical path of a laser projector according to yet another specific embodiment of the present application, where the first light-emitting part and the second light-emitting part adopt vertical-cavity surface-emitting lasers;

[0139] Figure 25 is Figure 24 Top view schematic diagram of the laser light source assembly in

[0140] Description of reference numerals:

[0141] 10: Laser projector

[0142] 11: Substrate

[0143] 12: Reflecting mirror

[0144] 12A / 12B: Reflecting surface

[0145] 20: Bracket

[0146] 21: Protective cover

[0147] 22: Collimating mirror

[0148] 23: Opening

[0149] 24: Card hole

[0150] 30: Diffraction component

[0151] 31: First diffractive optical element

[0152] 32: Second diffractive optical element

[0153] 40: Switching component

[0154] 50: Laser light source assembly

[0155] 51: First light-emitting part

[0156] 52: Second light-emitting part

[0157] 60: Carrying seat

[0158] 61: First guiding member

[0159] 62: Second guiding member

[0160] 70: Driving device

[0161] 71: Push-pull electromagnet

[0162] 72: Electromagnet main body

[0163] 73: Drawbar

[0164] 74: Motor

[0165] 75: Gear

[0166] 76: Rack

[0167] DM: Direction of movement Detailed implementation manners

[0168] In the following description, numerous specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other instances, some well-known technical features are not described to avoid confusion with the present application.

[0169] For a complete understanding of the present application, a detailed description will be presented in the following. It should be understood that these implementation manners are provided to make the disclosure of the present application thorough and complete, and to fully convey the concept of these exemplary implementation manners to those of ordinary skill in the art. Obviously, the implementation of the present application is not limited to the specific details familiar to those skilled in the art. The preferred implementation manners of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may have other implementation manners.

[0170] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they specify the presence of features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0171] The ordinal numbers such as "first" and "second" cited in the present application are only identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0172] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are only for illustrative purposes and are not restrictive.

[0173] Now, the exemplary implementation manners according to the present application will be described in more detail with reference to the accompanying drawings.

[0174] The present application provides a laser projector, a camera assembly having the same, and an electronic device.

[0175] To more accurately understand the technical solution of the present application, the structure of the laser projector will be introduced first.

[0176] As Figure 1 and Figure 2 shown, in the first embodiment, the laser projector 10 includes a substrate 11, a diffraction component 30, a switching component 40, a laser light source component 50, and a control component (not shown).

[0177] The laser light source component 50 includes a first light emitting part 51 and a second light emitting part 52, and is used for emitting laser light. It can be understood that the laser light emitted by the laser light source component 50 has a light beam path and an optical axis. Among them, the first light emitting part 51 and the second light emitting part 52 are arranged on the substrate 11. The first light emitting part 51 is used for emitting laser light with a first wavelength, and the second light emitting part 52 is used for emitting laser light with a second wavelength. The first wavelength is different from the second wavelength. Preferably, one of the first wavelength and the second wavelength is 840 nm to 860 nm, such as 850 nm; the other of the first wavelength and the second wavelength is 930 nm to 950 nm, such as 940 nm.

[0178] The diffraction component 30 is used for diffracting the laser light emitted by the laser light source component 50 to form a projection pattern. The diffraction component 30 includes a first diffractive optical element 31, a second diffractive optical element 32, and a carrier 60. A first guide 61 is provided at the bottom of the border of the carrier 60, extending along the moving direction of the carrier 60 in the bracket 20. The first diffractive optical element 31 and the second diffractive optical element 32 are arranged on the carrier 60, for example, arranged parallel to the substrate 11. Among them, the first diffractive optical element 31 is used for diffracting the first laser light emitted by the first light emitting part 51, and the second diffractive optical element 32 is used for diffracting the second laser light emitted by the second light emitting part 52.

[0179] The switching component 40 is arranged on the substrate 11 and connected to the diffraction component 30. The switching component 40 is movable relative to the laser light source component 50, so that the first diffractive optical element 31 and the second diffractive optical element 32 are movable relative to the laser light source component 50. For example, the switching component 40 is connected to the carrier 60, and is used for making the carrier movable relative to the laser light source component 50, so that the first diffractive optical element 31 and the second diffractive optical element 32 are movable relative to the laser light source component 50.

[0180] The control component is respectively coupled to the diffraction component 30, the switching component 40, and the laser light source component 50. Among them, the control component is configured to control the first laser and the second laser not to be emitted simultaneously (for example, the control component controls the first light-emitting part 51 and the second light-emitting part 52 not to emit light simultaneously), and the control component controls the switching component 40 to move so that: when the laser light source component 50 emits the first laser, the first diffractive optical element 31 moves onto the light beam path of the laser, and the second diffractive optical element moves out of the light beam path of the laser; when the laser light source component 50 emits the second laser, the second diffractive optical element 32 moves onto the light beam path of the laser, and the first diffractive optical element 31 moves out of the light beam path of the laser.

[0181] The laser projector according to the present application can emit the first laser and the second laser with different wavelengths. The control component controls the laser projector to emit the first laser and the second laser respectively, and correspondingly switches the diffractive optical elements for diffracting the laser, so that the laser projector can project the projection patterns of the lasers with different wavelengths respectively. By selecting the wavelength of the laser, the red glow phenomenon can be avoided.

[0182] For example, the control component controls one of the first light-emitting part 51 and the second light-emitting part 52 to emit laser according to the user instruction. Or the laser projector 10 further includes a light sensor for sensing the ambient brightness. The light sensor is coupled to the control component, and the control component controls one of the first light-emitting part and the second light-emitting part to emit laser according to the time information and / or the ambient brightness information. For example, the laser with a wavelength of 840 nm to 860 nm can be controlled to emit light during the day or when the ambient brightness is high, while the laser with a wavelength of 930 nm to 950 nm can be controlled to emit light at night or when the ambient brightness is low, so as to avoid the red glow phenomenon. For example, when the laser projector 10 is used in a monitoring device, the monitoring device can be made stealthy.

[0183] For example, the laser projector 10 is configured such that the control component controls the switching component 40 to move so that the first diffractive optical element 31 moves between a first position and a second position along the moving direction DM. Among them, as Figure 3 and Figure 4 shown, at the first position, the first diffractive optical element 31 is located on the light beam path of the laser, as Figure 5 and Figure 6 shown, at the second position, the first diffractive optical element 31 deviates from the light beam path of the laser. At the same time, the control component controls the switching component to move so that the second diffractive optical element 32 moves between a third position and a fourth position along the moving direction DM. Among them, as Figure 5 and Figure 6 shown, at the third position, the second diffractive optical element 32 is located on the light beam path of the laser, as Figure 1 and Figure 2As shown, the second diffractive optical element 32 is offset from the beam path of the laser at the fourth position. In other words, when the first diffractive optical element 31 is at the first position, the second diffractive optical element 32 is at the fourth position, and when the first diffractive optical element 31 is at the second position, the second diffractive optical element 32 is at the third position. Herein, the moving direction DM is perpendicular to the optical axis of the laser. The moving direction DM is, for example, the length direction of the substrate 11.

[0184] Specifically, the switching assembly 40 includes a bracket 20 and a driving device 70. The bracket 20 is fixedly disposed on the substrate 11. Herein, the carrier 60 is connected to the bracket (for example, the carrier 60 is disposed in the bracket 20) and is movable relative to the bracket 20 along the moving direction DM. The driving device 70 is coupled to the control assembly. The driving device 70 is disposed on the bracket 20 and is movable relative to the bracket 20 along the moving direction DM to drive the carrier 60 to move relative to the bracket 20 along the moving direction DM.

[0185] There is a cuboid accommodation cavity between the bracket 20 and the substrate 11, and the bracket 20 is provided with an opening 23 at the top of the accommodation cavity. The geometric center of the opening 23 is approximately located on the optical axes of the first diffractive optical element 31 at the first position and the second diffractive optical element 32 at the third position. The laser light source assembly 50 is located directly below the geometric center of the opening 23. The laser is emitted from the laser light source assembly 50, passes upward through the opening 23, and then passes through the first diffractive optical element 31 or the second diffractive optical element 32.

[0186] In the first embodiment of the present application, the driving device 70 includes a push-pull electromagnet 71. The push-pull electromagnet 71 includes an electromagnet main body 72 and a traction rod 73. The traction rod 73 is telescopically movable relative to the electromagnet main body 72 along the moving direction DM. Herein, the electromagnet main body 72 is disposed on the bracket 20, and the traction rod 73 is connected to the carrier 60. Thus, when the traction rod 73 telescopes, the traction rod 73 drives the carrier 60 to move relative to the substrate 11 along the moving direction DM.

[0187] For example, the traction rod 73 is provided with a lower connection portion at the end away from the electromagnet main body 72. The carrier 60 is provided with an upper connection portion corresponding to the lower connection portion. The upper connection portion and the lower connection portion are connected by screws or other means so that when the traction rod 73 telescopically moves, the lower connection portion at its end can drive the carrier 60 to move along the moving direction DM through the upper connection portion, thereby achieving the purpose of switching the first diffractive optical element 31 and the second diffractive optical element 32 on the carrier 60.

[0188] As Figure 3 and Figure 5As shown, a first guide member 61 is provided on the frame of the carrier base 60. A second guide member 62 is arranged on the bracket 20, and the second guide member 62 extends along the moving direction DM. The second guide member 62 and the driving device 79 are respectively arranged on both sides of the bracket 20 in the direction perpendicular to the moving direction DM. The first guide member 61 is connected to the second guide member 62 and is movable relative to the first guide member 61 along the moving direction DM. For example, the first guide member 61 is configured as a slide rail. The second guide member 62 is configured as a chute that cooperates with the slide rail. The chute is configured to extend from one end of the bracket 20 to the other end along the length direction of the substrate 11. The slide rail of the first guide member 61 is engaged with the chute of the second guide member 62, so that the carrier base 60 can slide from one end of the bracket 20 to the other end along the length direction of the substrate 11 under the action of the first guide member 61 and the second guide member 62. When the carrier base 60 is located at one end of the bracket 20, the first diffractive optical element 31 is in the first position, at this time the first diffractive optical element 31 is located on the light path of the first laser, and the second diffractive optical element 32 is located at the fourth position deviating from the light path of the second laser; when the carrier base 60 is located at the other end of the bracket 20, the second diffractive optical element 32 is in the third position, at this time the second diffractive optical element 32 is located on the light path of the second laser, and the first diffractive optical element 31 is located at the second position deviating from the light path of the first laser.

[0189] It can be understood that it is also possible that the first guide member 61 is configured as a chute and the second guide member 62 is configured as a slide rail.

[0190] As Figure 1 and Figure 2 As shown, the laser projector 10 further includes a protective cover 21. The protective cover 21 is provided on the bracket 20. The protective cover 21 and the laser light source assembly 50 are respectively located on both sides of the diffractive assembly 30 along the extension direction of the optical axis of the laser. The protective cover 21 and the bracket 20 and the substrate 11 form a closed space to accommodate and protect the internal structures and components.

[0191] As Figure 7 As shown, in the second embodiment of the present application, different from the first embodiment of the present application, a collimating mirror 22 is provided in the opening 23 of the bracket 20, and the optical axis of the collimating mirror 22 is approximately coincident with the optical axis of the first diffractive optical element 31 in the first position and the optical axis of the second diffractive optical element 32 in the third position. The laser light source assembly 50 is located directly below the optical axis of the collimating mirror 22. The collimating mirror 22 is located between the laser light source assembly 50 and the diffractive assembly 30 along the extension direction of the optical axis of the laser. The laser is emitted from the laser light source assembly 50, passes upward through the collimating mirror 22, and then passes through the first diffractive optical element 31 or the second diffractive optical element 32.

[0192] As Figures 8 to 12As shown, in the third embodiment of the present application, different from the first embodiment of the present application, the driving device 70 includes a motor 74, a gear 75, and a rack 76. For example, the bracket 20 is provided with a clamping hole 24 on the side opposite to the second guide 62, and the center of the clamping hole 24 is located on the axis of symmetry of the bracket 20 with respect to its length direction. The motor 74 is fixed in the clamping hole 24. The carrier 60 is provided with a rack 76 on the outer side of the frame on the side opposite to the first guide 61, and the rack 76 extends from one end of the frame to the other end along the length direction of the substrate 11. The gear 75 is coaxially and fixedly connected to the output shaft of the motor 74 and rotates synchronously with the output shaft. The gear 75 meshes with the rack 76, and the clockwise or counterclockwise rotation of the gear 75 will drive the rack 76 and the carrier 60 to move in the bracket 20, so that the first diffractive optical element 31 moves between the first position and the second position (the second diffractive optical element 32 moves between the fourth position and the third position), thereby achieving the purpose of switching the first diffractive optical element 31 and the second diffractive optical element 32 on the carrier 60.

[0193] As Figure 13 shown, in the fourth embodiment of the present application, different from the third embodiment of the present application, a collimator 22 is provided in the opening 23, and the optical axis of the collimator 22 approximately coincides with the optical axes of the first diffractive optical element 31 in the first position and the second diffractive optical element 32 in the third position. The laser light source assembly 50 is located directly below the optical axis of the collimator 22. Laser light can be emitted from the laser light source assembly 50, pass upward through the collimator 22, and then pass through the first diffractive optical element 31 or the second diffractive optical element 32.

[0194] In an embodiment not shown in the present application, the driving device 70 includes a motor, a synchronous pulley assembly, and a synchronous belt. Among them, the motor is arranged on the bracket 20. The synchronous pulley assembly is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft. The synchronous belt extends along the moving direction DM and is wound around the synchronous pulley assembly in a closed manner, so that the synchronous belt is driven to move along the moving direction DM. At the same time, the synchronous belt is connected to the carrier 60, thereby driving the carrier 60 to move synchronously.

[0195] In Figures 2 to 13 the embodiment shown, the first diffractive optical element 31 and the second diffractive optical element 32 are arranged on the same carrier 60, so that only one driving device 70 is provided for the laser projector 10. In such an embodiment, the dimension of the bracket 20 along the moving direction DM generally needs to accommodate 3 diffractive optical elements.

[0196] In some other embodiments of the present application, the first diffractive optical element 31 and the second diffractive optical element 32 are disposed on respective carriers 60, that is, the laser projector 10 includes two carriers 60. For example, the two carriers 60 can be arranged along the optical axis direction of the laser. In such an embodiment, the laser projector 10 can be provided with respective driving devices for each carrier 60, or only one driving device can be provided, and this driving device is simultaneously connected to and drives the two carriers to move. For example, the driving device includes a motor, a gear, and two racks. The motor is disposed on the bracket 20. The gear is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft. The two racks are respectively disposed on the two carriers 60. The axis of the gear is perpendicular to the optical axis direction of the laser and also perpendicular to the moving direction DM. The two racks both extend along the moving direction DM and are simultaneously engaged with the gear on both sides of the gear along the optical axis direction of the laser (or the gear is sandwiched between the two carriers 60). When the motor drives the gear to rotate, the two racks move in opposite directions along the moving direction DM, driving the two carriers 60 to move in opposite directions along the moving direction DM, realizing the switching between the first diffractive optical element 31 and the second diffractive optical element 32. In such an embodiment, compared with Figures 8 to 13 the embodiment shown, the laser light source assembly 50 is relatively located on one side of the bracket 20 instead of in the central region of the bracket 20. The dimension of the bracket 20 along the moving direction DM can be reduced to approximately accommodate two diffractive optical elements, but the dimension of the bracket 20 along the optical axis direction of the laser will increase.

[0197] In the present application, preferably, when the first diffractive optical element 31 is in the first position, the optical axis of the first light emitting portion 51 deviates from the optical axis of the first diffractive optical element 31 by no more than 5 μm. When the second diffractive optical element is in the third position, the optical axis of the second light emitting portion deviates from the optical axis of the second diffractive optical element by no more than 5 μm.

[0198] As Figures 14 to 17 shown, in a specific embodiment of the present application, the first light emitting portion 51 includes a vertical cavity surface emitting laser that emits a first laser, and the second light emitting portion 52 includes a vertical cavity surface emitting laser that emits a second laser. Among them, the first light emitting portion 51 and the second light emitting portion 52 are arranged staggeredly along the direction perpendicular to the optical axis of the laser (such as the length direction and / or the width direction). Among them, the length direction is perpendicular to the width direction, the length direction is perpendicular to the optical axis of the laser, and the width direction is also perpendicular to the optical axis of the laser. For example, the "length direction" is defined as Figures 14 to 17 the left-right direction; the "width direction" is defined as Figure 19 the direction perpendicular to the paper surface, and Figures 14 to 17 the up-down direction.

[0199] In Figure 14In the illustrated embodiment, the distances from the optical axes of the first light-emitting portion 51 and the second light-emitting portion 52 to the optical axis of the collimator 22 are not equal. The optical axis of the collimator 22 extends through the first light-emitting portion 51. For example, the optical axis of the first light-emitting portion 51 coincides with the optical axis of the collimator 22. In Figure 15 In the illustrated embodiment, the distances from the optical axes of the first light-emitting portion 51 and the second light-emitting portion 52 to the optical axis of the collimator 22 are not equal. The optical axis of the collimator 22 extends through the second light-emitting portion 52. For example, the optical axis of the second light-emitting portion 52 coincides with the optical axis of the collimator 22. In Figure 16 In the illustrated embodiment, the optical axis of the collimator 22 is located between the optical axes of the first light-emitting portion 51 and the second light-emitting portion 52. For example, the distances from the optical axes of the first light-emitting portion 51 and the second light-emitting portion 52 to the optical axis of the collimator 22 are equal.

[0200] The first light-emitting portion 51 and the second light-emitting portion 52 are arranged close to or in contact with each other. Preferably, the optical axis of the collimator 22, the optical axis of the first light-emitting portion 51, and the optical axis of the second light-emitting portion 52 are parallel to each other and coplanar.

[0201] As Figures 18 to 22 shown, in a specific embodiment of the present application, the first light-emitting portion 51 and the second light-emitting portion 52 respectively have a plurality of vertical cavity surface emitting lasers, so that the first light-emitting portion 51 and the second light-emitting portion 52 are alternately arranged in the length direction and / or the width direction.

[0202] As Figures 19 to 20 shown, the first light-emitting portion 51 includes a plurality of single-hole vertical cavity surface emitting lasers, and the second light-emitting portion 52 includes a plurality of single-hole vertical cavity surface emitting lasers. Specifically, the plurality of single-hole vertical cavity surface emitting lasers of the first light-emitting portion 51 are arranged in a plurality of columns at a first predetermined pitch P1 in the length direction. The plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a second predetermined pitch Q1 in the width direction. The plurality of single-hole vertical cavity surface emitting lasers of the second light-emitting portion 52 are arranged in a plurality of columns at a third predetermined pitch P2 in the length direction. The plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a fourth predetermined pitch Q2 in the width direction. Preferably, the number of columns of the first light-emitting portion 51 is equal to the number of columns of the second light-emitting portion 52. Preferably, the number of single-hole vertical cavity surface emitting lasers in each column of the first light-emitting portion 51 is equal to the number of single-hole vertical cavity surface emitting lasers in each column of the second light-emitting portion 52. The optical axes of all the single-hole vertical cavity surface emitting lasers are parallel to the optical axis of the collimator 22. Preferably, the optical axis of the collimator 22 passes through the approximate geometric center of the plane area formed by all the single-hole vertical cavity surface emitting lasers.

[0203] As Figure 19As shown, preferably, in two adjacent columns of the first light-emitting part 51, the single-hole vertical cavity surface emitting lasers located in the same row are arranged to be aligned in the width direction. Preferably, in two adjacent columns of the second light-emitting part 52, the single-hole vertical cavity surface emitting lasers located in the same row are arranged to be aligned in the width direction. Preferably, between two adjacent columns of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51, there is one column of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, and between two adjacent columns of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, there is one column of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51. Thus, the first light-emitting part 51 and the second light-emitting part 52 are alternately arranged in the length direction. Or preferably, between two adjacent rows of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51, there is one row of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, and between two adjacent rows of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, there is one row of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51. Thus, the first light-emitting part 51 and the second light-emitting part 52 are alternately arranged in the width direction.

[0204] As Figure 20 shown, in two adjacent columns of the first light-emitting part 51, the single-hole vertical cavity surface emitting lasers located in the same row are arranged to be staggered from each other in the width direction (for example, staggered by half of the second predetermined pitch Q1), and in two adjacent columns of the second light-emitting part 52, the single-hole vertical cavity surface emitting lasers located in the same row are arranged to be staggered from each other in the width direction (for example, staggered by half of the fourth predetermined pitch Q2). Between two columns of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51 with one column in between, there is one column of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, and between two columns of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52 with one column in between, there is one column of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51. Between two rows of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51 with one row in between, there is one row of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52, and between two rows of the single-hole vertical cavity surface emitting lasers of the second light-emitting part 52 with one row in between, there is one row of the single-hole vertical cavity surface emitting lasers of the first light-emitting part 51. Thus, the first light-emitting part 51 and the second light-emitting part 52 are alternately arranged in the length direction and the width direction.

[0205] As Figure 21As shown, the first light-emitting part 51 includes a plurality of porous vertical cavity surface emitting lasers, and the second light-emitting part 52 includes a plurality of porous vertical cavity surface emitting lasers. Each of the plurality of porous vertical cavity surface emitting lasers in the first light-emitting part 51 forms a column of the first light-emitting part 51, and the plurality of columns of the first light-emitting part 51 are arranged at intervals of a first preset distance X1 in the length direction. Each of the plurality of porous vertical cavity surface emitting lasers in the second light-emitting part 52 forms a column of the second light-emitting part 52, and the plurality of columns of the second light-emitting part 52 are arranged at intervals of a second preset distance X2 in the length direction. One column of the porous vertical cavity surface emitting lasers of the second light-emitting part 52 is provided between any two adjacent columns of the porous vertical cavity surface emitting lasers of the first light-emitting part 51. One column of the porous vertical cavity surface emitting lasers of the first light-emitting part 51 is provided between any two adjacent columns of the porous vertical cavity surface emitting lasers of the second light-emitting part 52. Thus, the first light-emitting part 51 and the second light-emitting part 52 are alternately arranged in the length direction.

[0206] Alternatively, as Figure 22 shown, each of the plurality of porous vertical cavity surface emitting lasers in the first light-emitting part 51 forms a row of the first light-emitting part 51, and the plurality of rows of the first light-emitting part 51 are arranged at intervals of a third preset distance Y1 in the width direction. Each of the plurality of porous vertical cavity surface emitting lasers in the second light-emitting part 52 forms a row of the second light-emitting part 52, and the plurality of rows of the second light-emitting part 52 are arranged at intervals of a fourth preset distance Y2 in the width direction. One row of the porous vertical cavity surface emitting lasers of the second light-emitting part 52 is provided between any two adjacent rows of the porous vertical cavity surface emitting lasers of the first light-emitting part 51. One row of the porous vertical cavity surface emitting lasers of the first light-emitting part 51 is provided between any two adjacent rows of the porous vertical cavity surface emitting lasers of the second light-emitting part 52. Thus, the first light-emitting part 51 and the second light-emitting part 52 are alternately arranged in the width direction.

[0207] As Figure 23As shown, in yet another specific embodiment of the present application, the first light-emitting portion 51 includes an edge-emitting laser that emits a first laser, and the second light-emitting portion 52 includes an edge-emitting laser that emits a second laser. The two edge-emitting lasers are arranged opposite to each other. The optical axes of the two edge-emitting lasers are parallel to the substrate 11 and perpendicular to the optical axes of the first diffractive optical element 31 and the second diffractive optical element 32. Preferably, the optical axes of the two edge-emitting lasers are collinear. Between the first light-emitting portion 51 and the second light-emitting portion 52, two collimating mirrors 22 are provided, which are respectively used for collimating the first laser and the second laser. Specifically, between the first light-emitting portion 51 and the second light-emitting portion 52, that is, between the two collimating mirrors 22, a reflecting mirror 12 is provided, which is used for reflecting the first laser and the second laser to the diffractive optical element. Preferably, the cross-section of the reflecting mirror 12 parallel to the optical axes of the first diffractive optical element 31 and the second diffractive optical element 32 is configured as an isosceles right triangle. Among them, the two right-angled sides correspond to the two reflecting surfaces 12A / 12B. The reflecting surface 12A is used for reflecting the collimated first laser, and the reflecting surface 12B is used for reflecting the collimated second laser. The first laser reflected by the reflecting surface 12A and the second laser reflected by the reflecting surface 12B are respectively perpendicularly incident on the first diffractive optical element 31 located at the first position and the second diffractive optical element 32 located at the third position.

[0208] It can be understood that when the first diffractive optical element 31 and the second diffractive optical element 32 have their own collimating functions, Figure 23 the two collimating mirrors 22 can be omitted in the embodiment shown.

[0209] Preferably, the reflecting mirror 12 is configured as a total reflecting mirror, so that the energy of the laser can be retained to the greatest extent and stray light in the system can be avoided.

[0210] It can be understood that in the above solution of using the switching component 40 to switch the diffractive optical element, the first diffractive optical element 31 is only used for the first light-emitting portion 51, and the second diffractive optical element 32 is only used for the second light-emitting portion 52. In other words, the first light-emitting portion 51 and the first diffractive optical element 31 form a projection system, and the second light-emitting portion 52 and the second diffractive optical element 32 form another projection system, and the two projection systems are independent of each other. In this case, only the first diffractive optical element 31 and the second diffractive optical element 32 need to be designed respectively according to the light source-related characteristics, optical path-related characteristics and specific requirements of the projected light of their respective projection systems, without considering the other projection system.

[0211] The driving device 70 is a moving part in the laser projector 10. Therefore, its failure rate may be higher than that of other hardware components. When the driving device 70 fails, the switching between the first diffractive optical element 31 and the second diffractive optical element 32 cannot be achieved, so that only one diffractive optical element can be used by the first light emitting part 51 and the second light emitting part 52. In view of this situation, in order to facilitate the subsequent repair of faults or increase the redundancy of the components of the laser projector 10, in some embodiments of the present application, the size relationship between the first light emitting part 51 and the second light emitting part 52 satisfies certain limiting conditions, so that the first light emitting part 51 and the second light emitting part 52 can share the same diffractive optical element. In other words, in some other embodiments of the present application, when designing the diffractive optical element of a projection system, the other projection system is also considered.

[0212] Specifically, as Figure 14 and Figure 17 shown, for the first light emitting part 51, according to the grating equation, the minimum periodic structure size D1 of the diffractive optical element in the length direction and the incident angle θ of the first laser with the wavelength of the first wavelength λ1 have the relationship defined by formula (1):

[0213] 2D1sinθ = kλ1 (1)

[0214] where k is the grating order, for example, k = 1. Therefore,

[0215]

[0216] Similarly, for the first light emitting part 51, the minimum periodic structure size E1 of the diffractive optical element in the width direction has the relationship defined by formula (3):

[0217]

[0218] Similarly, for the second light emitting part 52, the minimum periodic structure size D2 of the diffractive optical element in the length direction has the relationship defined by formula (4):

[0219]

[0220] Similarly, for the second light emitting part 52, the minimum periodic structure size E2 of the diffractive optical element in the width direction has the relationship defined by formula (5):

[0221]

[0222] If the periodic structure of the diffractive optical element 30 is to satisfy both the first light-emitting portion 51 and the second light-emitting portion 52 simultaneously, it is necessary to make D1 = D2 and E1 = E2. Therefore, the laser projector 10 is configured such that the sizes of the first light-emitting portion 51 and the second light-emitting portion 52 satisfy the following relationship:

[0223]

[0224]

[0225] It can be understood that in the Figures 14 to 23 embodiment shown, the sizes of the first light-emitting portion 51 and the second light-emitting portion 52 can preferably satisfy the size relationship defined by formulas (6) and (7). Thus, the first diffractive optical element 31 and the second diffractive optical element 32 can be configured as the same diffractive optical element, making the component configuration of the laser projector 10 redundant. Alternatively, when the driving device 70 fails, by simply replacing the first diffractive optical element 31 or the second diffractive optical element 32, the first light-emitting portion 51 and the second light-emitting portion 52 can share a new diffractive optical element, and the use of the laser projector 10 can still be guaranteed.

[0226] As Figures 24 to 25 shown, in another specific embodiment of the present application, both the first light-emitting portion 51 and the second light-emitting portion 52 are vertical cavity surface emitting lasers. The second light-emitting portion 52 includes two vertical cavity surface emitting lasers that emit the second laser, and these two parts are spaced apart from each other in a direction perpendicular to the optical axis of the laser. The two parts of the second light-emitting portion 52 are respectively arranged on both sides of the first light-emitting portion 51. The first light-emitting portion 51 and the second light-emitting portion 52 are arranged to be close to or in contact with each other. Preferably, the optical axes of the collimating mirror 22, the first light-emitting portion 51, and the second light-emitting portion 52 are parallel to each other and coplanar.

[0227] In Figure 24 and Figure 25 the embodiment shown, similarly, when the sizes of the first light-emitting portion 51 and the second light-emitting portion 52 satisfy the matching relationship, it is also possible to achieve that the first light-emitting portion 51 and the second light-emitting portion 52 can share the same diffractive optical element.

[0228] Specifically, the dimension of the first light-emitting portion 51 in the length direction is L1, and the dimension in the width direction is H1. The dimension of each of the two parts of the second light-emitting portion 52 in the length direction is L2, and the dimension in the width direction is H2. The distance between the two parts of the second light-emitting portion 52 in the length direction is L d . In order to make the speckle patterns formed by the second lasers emitted by the two parts of the second light-emitting portion 52 after passing through the collimating mirror 22 and the diffractive optical element 30 just be able to be staggered and superimposed, L dIt is 2N times that of L2, where N is a positive integer, for example, any one of 1, 2, and 3. Similarly, according to the grating equation, in order for the periodic structure of the same diffractive optical element to simultaneously satisfy the first wavelength λ1 and the second wavelength λ2, and to ensure that the projected light of the two parts of the second light-emitting portion 52 can be well spliced, the laser projector 10 is configured such that the sizes of the first light-emitting portion 51 and the second light-emitting portion 52 satisfy the following relationship:

[0229]

[0230]

[0231] In this application, preferably, the optical axis of the first light-emitting portion 51 deviates from the optical axis of the collimator 22 by no more than 5 μm, and the optical axis of the second light-emitting portion 52 deviates from the optical axis of the collimator 22 by no more than 5 μm.

[0232] The second aspect of this application provides a camera assembly. In a preferred embodiment, it includes the above-mentioned laser projector 10, an image collector, and a processor. Among them, the image collector is used to collect the laser image formed by the projection pattern of the laser projector 10. The processor is used to process the laser image to obtain a depth image. Preferably, the processor includes the control component of the laser projector 10.

[0233] The third aspect of this application provides an electronic device. In a preferred embodiment, it includes a housing and the camera assembly according to the application. Among them, the camera assembly is disposed on the housing and exposed from the housing to obtain a depth image. Preferably, the electronic device is a monitoring device.

[0234] Since the camera assembly and the electronic device according to this application include the laser projector 10, they have all the features and effects of the laser projector 10.

[0235] It should be particularly noted that in the drawings of this application Figures 14 to 25 are only schematic diagrams for facilitating the understanding of this application and are not used to specifically define the situation of the product. The features of the product shall be subject to the description herein.

[0236] As used herein, the terms "attached" or "attachment" include: a configuration in which an element is directly fixed to another element by directly securing the element to the other element; a configuration in which an element is indirectly fixed to another element by fixing the element to an intermediate member, which in turn is fixed to the other element; and a configuration in which one element is integral with another element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings, such as "connected", "coupled", "joined", "mounted", "adhered", "fixed" and their derivatives. Finally, degree terms such as "substantially", "about" and "approximate" as used herein denote the amount of deviation that modifies the term such that the end result is not significantly changed.

[0237] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit this application. Features described in one embodiment herein may be applied, either alone or in combination with other features, to another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.

[0238] This application has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and explanatory purposes only and are not intended to limit this application to the scope of the described embodiments. In addition, those skilled in the art can understand that this application is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of this application, and these variations and modifications all fall within the scope claimed by this application.

Claims

1. A laser projector, characterized in that, Comprising: A substrate; A laser light source assembly, disposed on the substrate, for emitting laser light, the laser light including first laser light having a first wavelength and second laser light having a second wavelength, wherein the first wavelength is not equal to the second wavelength, and the laser light source assembly includes a first light emitting portion for emitting the first laser light and a second light emitting portion for emitting the second laser light; A diffraction assembly for diffracting the laser light to form a projection pattern, the diffraction assembly including a first diffractive optical element for diffracting the first laser light and a second diffractive optical element for diffracting the second laser light; A switching assembly, the switching assembly being disposed on the substrate and connected to the diffraction assembly, the switching assembly being movable relative to the laser light source assembly so that the first diffractive optical element and the second diffractive optical element are movable relative to the laser light source assembly; And A control assembly, the control assembly being respectively coupled to the diffraction assembly and the switching assembly, Wherein the control assembly is configured to control the first light emitting portion and the second light emitting portion not to emit light simultaneously, so that the first laser light and the second laser light are not emitted simultaneously, and the control assembly controls the switching assembly to move so that: When the laser light source assembly emits the first laser light, the first diffractive optical element moves along the moving direction onto the beam path of the laser light, and the second diffractive optical element moves out of the beam path of the laser light along the moving direction; When the laser light source assembly emits the second laser light, the second diffractive optical element moves along the moving direction onto the beam path of the laser light, and the first diffractive optical element moves out of the beam path of the laser light along the moving direction, Wherein the moving direction is perpendicular to the optical axis of the laser light.

2. The laser projector according to claim 1, wherein One of the first wavelength and the second wavelength is from 840 nm to 860 nm, and the other of the first wavelength and the second wavelength is from 930 nm to 950 nm.

3. The laser projector according to claim 2, wherein The control assembly controls one of the first light emitting portion and the second light emitting portion to emit the laser light according to a user instruction; or The laser projector further includes a light sensor for sensing the ambient brightness, the light sensor being coupled to the control assembly, and the control assembly controls one of the first light emitting portion and the second light emitting portion to emit the laser light according to time information and / or ambient brightness information.

4. The laser projector according to claim 1, characterized in that, The laser projector is configured such that: The control assembly controls the switching assembly to move so that the first diffractive optical element moves between a first position and a second position along the moving direction, wherein, at the first position, the first diffractive optical element is located on the beam path of the laser light, and at the second position, the first diffractive optical element deviates from the beam path of the laser light; The control component controls the switching component to move so that the second diffractive optical element moves between a third position and a fourth position along the moving direction. Wherein, at the third position, the second diffractive optical element is located on the light path of the laser, and at the fourth position, the second diffractive optical element deviates from the light path of the laser.

5. The laser projector according to claim 4, wherein when the first diffractive optical element is located at the first position, the optical axis of the first light emitting part deviates from the optical axis of the first diffractive optical element by no more than 5 μm; when the second diffractive optical element is located at the third position, the optical axis of the second light emitting part deviates from the optical axis of the second diffractive optical element by no more than 5 μm.

6. The laser projector according to claim 4, wherein the diffractive component includes a carrier seat, and the first diffractive optical element and the second diffractive optical element are arranged on the carrier seat, the switching component is connected to the carrier seat and is used for making the carrier seat move relative to the laser light source component along the moving direction.

7. The laser projector according to claim 6, characterized in that, The first diffractive optical element and the second diffractive optical element are arranged on their respective carrier seats, or the first diffractive optical element and the second diffractive optical element are arranged on the same carrier seat.

8. The laser projector according to claim 7, wherein The switching component includes: a bracket, the bracket is arranged on the substrate, wherein the carrier seat is connected to the bracket and is movable relative to the bracket along the moving direction; and a driving device, the driving device is coupled to the control component, the driving device is arranged on the bracket and is movable relative to the bracket to drive the carrier seat to move relative to the bracket.

9. The laser projector according to claim 8, characterized in that, The driving device includes a push-pull electromagnet, the push-pull electromagnet includes an electromagnet main body and a traction rod, the traction rod is telescopable relative to the electromagnet main body along the moving direction, wherein the electromagnet main body is arranged on the bracket and the traction rod is connected to the carrier seat.

10. The laser projector according to claim 8, characterized in that, The driving device includes: a motor, the motor is arranged on the bracket; a gear, the gear is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft; and a rack, the rack is arranged on the carrier seat, the rack extends along the moving direction, and the rack meshes with the gear.

11. The laser projector according to claim 8, wherein, The driving device includes: a motor, the motor is arranged on the bracket; a synchronous pulley assembly, the synchronous pulley assembly is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft; and a synchronous belt, the synchronous belt is connected to the carrier seat and wound around the synchronous pulley assembly in a closed manner, wherein, the synchronous belt is driven to move along the moving direction.

12. The laser projector according to claim 8, characterized in that, It further includes: a second guide member, arranged on the bracket, the second guide member extends along the moving direction; and a first guide member, arranged on the carrier seat, the first guide member is connected to the second guide member and is movable relative to the second guide member along the moving direction.

13. The laser projector according to claim 12, characterized in that, One of the first guiding member and the second guiding member is configured as a slide rail, and the other of the first guiding member and the second guiding member is configured as a slide groove, and the slide groove accommodates the slide rail.

14. The laser projector according to claim 8, characterized in that, It further includes a protective cover, and the protective cover is arranged on the bracket, wherein the protective cover and the laser light source assembly are respectively located on both sides of the diffraction assembly along the extending direction of the optical axis.

15. The laser projector according to claim 8, characterized in that, It further includes a collimating mirror, and the collimating mirror is arranged on the bracket and is located between the laser light source assembly and the diffraction assembly along the extending direction of the optical axis.

16. The laser projector according to claim 15, characterized in that, The optical axis of the first light-emitting part deviates from the optical axis of the collimating mirror by no more than 5 μm, and the optical axis of the second light-emitting part deviates from the optical axis of the collimating mirror by no more than 5 μm.

17. The laser projector according to claim 8, wherein The first diffractive optical element and the second diffractive optical element are arranged on their respective carrier seats, and the two carrier seats are arranged along the optical axis direction of the laser; The driving device includes: A motor, and the motor is arranged on the bracket; A gear, and the gear is coaxially connected to the output shaft of the motor and rotates synchronously with the output shaft, and the axis of the gear is perpendicular to the optical axis of the laser and the moving direction; and Two racks, and the two racks are respectively arranged on the two carrier seats, the two racks extend along the moving direction, and are engaged with the gear on both sides of the gear along the optical axis direction of the laser.

18. The laser projector according to any one of claims 1 to 17, characterized in that, The first light-emitting part and the second light-emitting part are vertical cavity surface emitting lasers.

19. The laser projector according to claim 18, characterized in that, The first light-emitting part and the second light-emitting part are arranged along a direction perpendicular to the optical axis of the laser.

20. The laser projector according to claim 18, characterized in that, The second light-emitting part includes two parts spaced from each other along a direction perpendicular to the optical axis of the laser, and the two parts are respectively located on both sides of the first light-emitting part.

21. The laser projector according to claim 18, characterized in that, The first light-emitting part and the second light-emitting part are alternately arranged in the length direction and / or the width direction, wherein the length direction is perpendicular to the width direction, the length direction is perpendicular to the optical axis of the laser, and the width direction is perpendicular to the optical axis of the laser.

22. The laser projector according to claim 21, characterized in that, The first light-emitting part is composed of a plurality of single-hole vertical cavity surface emitting lasers, and the second light-emitting part is composed of a plurality of single-hole vertical cavity surface emitting lasers.

23. The laser projector according to claim 22, wherein The plurality of single-hole vertical cavity surface emitting lasers of the first light-emitting part are arranged in a plurality of columns at a first predetermined pitch interval along the length direction, and the plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a second predetermined pitch interval along the width direction; The plurality of single-hole vertical cavity surface emitting lasers of the second light-emitting part are arranged in a plurality of columns at a third predetermined pitch interval along the length direction, and the plurality of single-hole vertical cavity surface emitting lasers in each column are arranged in a plurality of rows at a fourth predetermined pitch interval along the width direction.

24. The laser projector according to claim 23, wherein Between any two adjacent single-hole vertical cavity surface emitting lasers of the first light emitting part, there is one column of single-hole vertical cavity surface emitting lasers of the second light emitting part, and between any two adjacent single-hole vertical cavity surface emitting lasers of the second light emitting part, there is one column of single-hole vertical cavity surface emitting lasers of the first light emitting part; or Between any two adjacent rows of single-hole vertical cavity surface emitting lasers of the first light emitting part, there is one row of single-hole vertical cavity surface emitting lasers of the second light emitting part, and between any two adjacent rows of single-hole vertical cavity surface emitting lasers of the second light emitting part, there is one row of single-hole vertical cavity surface emitting lasers of the first light emitting part.

25. The laser projector according to claim 23, wherein In two adjacent columns of the first light emitting part, the single-hole vertical cavity surface emitting lasers with the same row number are staggered from each other in the width direction. In two adjacent columns of the second light emitting part, the single-hole vertical cavity surface emitting lasers with the same row number are staggered from each other in the width direction; Between any two columns of single-hole vertical cavity surface emitting lasers of the first light emitting part with a column number difference of 2, there is one column of single-hole vertical cavity surface emitting lasers of the second light emitting part, and between any two columns of single-hole vertical cavity surface emitting lasers of the second light emitting part with a column number difference of 2, there is one column of single-hole vertical cavity surface emitting lasers of the first light emitting part; Between any two rows of single-hole vertical cavity surface emitting lasers of the first light emitting part with a row number difference of 2, there is one row of single-hole vertical cavity surface emitting lasers of the second light emitting part, and between any two rows of single-hole vertical cavity surface emitting lasers of the second light emitting part with a row number difference of 2, there is one row of single-hole vertical cavity surface emitting lasers of the first light emitting part.

26. The laser projector according to claim 21, characterized in that, The first light emitting part is composed of a plurality of multi-hole vertical cavity surface emitting lasers, and the second light emitting part is composed of a plurality of multi-hole vertical cavity surface emitting lasers.

27. The laser projector according to claim 26, wherein Each of the plurality of multi-hole vertical cavity surface emitting lasers of the first light emitting part constitutes one column of the first light emitting part, and a plurality of columns of the first light emitting part are arranged at intervals in the length direction with a first preset interval, Each of the plurality of multi-hole vertical cavity surface emitting lasers of the second light emitting part constitutes one column of the second light emitting part, and a plurality of columns of the second light emitting part are arranged at intervals in the length direction with a second preset interval, Between any two adjacent columns of multi-hole vertical cavity surface emitting lasers of the first light emitting part, there is one column of multi-hole vertical cavity surface emitting lasers of the second light emitting part, and between any two adjacent columns of multi-hole vertical cavity surface emitting lasers of the second light emitting part, there is one column of multi-hole vertical cavity surface emitting lasers of the first light emitting part; Or Each of the plurality of multi - hole vertical cavity surface emitting lasers of the first light emitting part forms a row of the first light emitting part, and a plurality of rows of the first light emitting part are arranged at intervals in the width direction with a third preset pitch. Each of the plurality of multi - hole vertical cavity surface emitting lasers of the second light emitting part forms a row of the second light emitting part, and a plurality of rows of the second light emitting part are arranged at intervals in the width direction with a fourth preset pitch. One row of the multi - hole vertical cavity surface emitting lasers of the second light emitting part is provided between any two adjacent rows of the multi - hole vertical cavity surface emitting lasers of the first light emitting part, and one row of the multi - hole vertical cavity surface emitting lasers of the first light emitting part is provided between any two adjacent rows of the multi - hole vertical cavity surface emitting lasers of the second light emitting part.

28. The laser projector according to any one of claims 1 to 14, characterized in that, The first light emitting part and the second light emitting part are edge - emitting lasers.

29. The laser projector according to claim 28, characterized in that, The laser projector further includes a reflector, which is arranged on the substrate and located between the first light emitting part and the second light emitting part, and is used to reflect the first laser and the second laser to the diffractive optical element.

30. The laser projector according to claim 29, characterized in that, The cross - section of the reflector parallel to the optical axis of the diffractive optical element is configured as an isosceles right - triangle, where the two right - angled sides correspond to two reflecting surfaces, respectively used to reflect the first laser and the second laser.

31. The laser projector according to claim 29, characterized in that, The reflector is configured as a total - reflection mirror.

32. The laser projector according to claim 29, characterized in that, It further includes two collimating mirrors, which are arranged on the substrate and are respectively used to collimate the first laser and the second laser, and the reflector is located in the middle of the two collimating mirrors.

33. The laser projector according to claim 32, characterized in that, The optical axes of the two collimating mirrors are not parallel to the optical axis of the first diffractive optical element and the optical axis of the second diffractive optical element.

34. A camera component, characterized in that, Comprising: The laser projector according to any one of claims 1 to 33; An image collector, configured to collect a laser image formed by the projection pattern of the laser projector; And A processor, configured to process the laser image to obtain a depth image.

35. The camera assembly according to claim 34, wherein The processor includes the control component.

36. An electronic device, characterized in that, Comprising: A housing; And The camera assembly according to claim 34 or 35, the camera assembly is arranged on the housing and exposed from the housing to obtain a depth image.

37. The electronic device according to claim 36, wherein The electronic device is a monitoring device.

Images