CN108490595B - Structured light projection module, image acquisition device and electronic equipment - Google Patents
Structured light projection module, image acquisition device and electronic equipment Download PDFInfo
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- CN108490595B CN108490595B CN201810200857.6A CN201810200857A CN108490595B CN 108490595 B CN108490595 B CN 108490595B CN 201810200857 A CN201810200857 A CN 201810200857A CN 108490595 B CN108490595 B CN 108490595B
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- G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
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Abstract
The invention discloses a structured light projection module, an image acquisition device and electronic equipment. The structured light projection module comprises a first laser generator, a second laser generator and a reflection element. The first laser generator is used for emitting first laser; the second laser generator is arranged opposite to the first laser generator and is used for emitting second laser. The first laser generator and the second laser generator are respectively arranged on two opposite sides of the reflecting element, and the reflecting element is used for reflecting the first laser and the second laser towards the same direction. In the structured light projection module, the image acquisition device and the electronic equipment, the first laser emitted by the first laser generator and the second laser emitted by the second laser generator are respectively reflected by the reflecting element and then converged, and the irrelevance of the laser pattern formed by converged laser is higher than that of the laser pattern formed by a single laser generator, so that the measurement precision of the structured light projection module is improved.
Description
Technical Field
The present invention relates to the field of optical and electronic technologies, and in particular, to a structured light projection module, an image capturing device, and an electronic apparatus.
Background
In the prior art, an image acquisition device usually projects a laser pattern to a target object by using a structured light projection module, and then acquires the laser pattern modulated by the target object by using an image collector to obtain a depth image of the target object, the degree of the irrelevance of the laser pattern directly affects the degree of the depth image accuracy and the speed of acquiring the depth image, and when a laser light source is formed, the irrelevance of the corresponding laser pattern is also determined, so that the measurement accuracy of the structured light projection module cannot be improved by changing the irrelevance of the laser pattern.
Disclosure of Invention
The embodiment of the invention provides a structured light projection module, an image acquisition device and electronic equipment.
The structured light projection module according to the embodiment of the present invention includes:
a first laser generator for emitting first laser light;
a second laser generator arranged opposite to the first laser generator, the second laser generator being configured to emit a second laser light; and
the first laser generator and the second laser generator are respectively arranged on two opposite sides of the reflecting element, and the reflecting element is used for reflecting the first laser and the second laser towards the same direction.
In some embodiments, the reflective element is a prism, and the reflective element includes two first and second reflective portions located inside the prism and intersecting each other, a reflective surface of the first reflective portion is opposite to the first laser generator to reflect the first laser light, and a reflective surface of the second reflective portion is opposite to the second laser generator to reflect the second laser light.
In some embodiments, the reflective element is a prism, and the reflective element includes two first and second reflective surfaces located outside the prism, the first reflective surface being opposite to the first laser generator to reflect the first laser light, and the second reflective surface being opposite to the second laser generator to reflect the second laser light.
In some embodiments, the reflective element comprises a first prism and a second prism, the first prism comprising a first reflective surface, the second prism comprising a second reflective surface, the first reflective surface opposing the first laser generator to reflect the first laser light, the second reflective surface opposing the second laser generator to reflect the second laser light.
In some embodiments, the first laser generator and the second laser generator are edge emitting lasers, the first laser generator includes a first light emitting surface, the second laser generator includes a second light emitting surface, and the first light emitting surface and the second light emitting surface face the reflective element.
In certain embodiments, the first laser generator and the second laser generator are vertical cavity surface emitting lasers.
In some embodiments, the first laser light has a different light intensity than the second laser light.
In some embodiments, the laser pattern of the first laser is different from the laser pattern of the second laser.
In some embodiments, the structured light projection module further includes a substrate assembly and a lens barrel, the lens barrel is disposed on the substrate assembly and forms an accommodating cavity together with the substrate assembly, and the first laser generator, the second laser generator, and the reflection element are disposed on the substrate assembly and accommodated in the accommodating cavity.
In some embodiments, the structured light projection module further includes a collimating element and a diffractive optical element disposed in the lens barrel, the first laser and the second laser are reflected by the reflecting element and then converged to form converged laser, and the converged laser sequentially passes through the collimating element and the diffractive optical element.
An image acquisition apparatus according to an embodiment of the present invention includes:
the structured light projection module of any of the above embodiments;
the image collector is used for collecting the laser patterns projected by the structured light projection module; and
and the processor is respectively connected with the structured light projection module and the image collector and is used for processing the laser pattern to obtain a depth image.
An electronic device according to an embodiment of the present invention includes:
a housing; and
the image capturing apparatus according to the above embodiment, wherein the image capturing apparatus is disposed in the housing and exposed from the housing to capture a depth image.
In the structured light projection module, the image acquisition device and the electronic device of the embodiment of the invention, the first laser emitted by the first laser generator and the second laser emitted by the second laser generator are respectively reflected by the reflecting element and then converged, and the irrelevance of the laser pattern formed by converged laser is higher than that of the laser pattern formed by a single laser generator, so that the measurement precision of the structured light projection module is improved.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of an image capture device according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a structured light projection module according to an embodiment of the present invention;
FIGS. 4-7 are schematic diagrams of light paths of light sources according to embodiments of the invention;
FIG. 8 is a schematic cross-sectional view of a structured light projection module according to an embodiment of the present invention;
fig. 9 to 10 are schematic partial structural views of a structured light projection module according to an embodiment of the present invention.
Description of the main elements and symbols:
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.
In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, an electronic device 1000 according to an embodiment of the present invention includes a housing 200 and an image capturing apparatus 100. The electronic device 1000 may be a mobile phone, a tablet computer, a laptop computer, a game machine, a head display device, an access control system, a teller machine, and the like, and the electronic device 1000 is taken as an example to illustrate the embodiment of the present invention, and it is understood that the specific form of the electronic device 1000 may be other forms, and is not limited herein. The image capturing device 100 is disposed in the housing 200 and exposed from the housing 200 to capture a depth image, the housing 200 can provide protection for the image capturing device 100, such as dust prevention, water prevention, and falling prevention, and a hole corresponding to the image capturing device 100 is formed in the housing 200, so that light can pass through the hole or penetrate into the housing 200.
Referring to fig. 2, the image capturing apparatus 100 includes a structured light projection module 10, an image collector 20 and a processor 30. The image capturing apparatus 100 may be formed with a projection window 40 corresponding to the structured light projection module 10, and a collection window 50 corresponding to the image collector 20. The structured light projection module 10 is configured to project a laser pattern to a target space through the projection window 40, and the image collector 20 is configured to collect the laser pattern modulated by a target object through the collection window 50. In one example, the laser light projected by the structured light projection module 10 is infrared light, and the image collector 20 is an infrared camera. The processor 30 is connected to both the structured light projection module 10 and the image collector 20, and the processor 30 is configured to process the laser pattern to obtain a depth image. Specifically, the processor 30 calculates the deviation value between each pixel point in the laser pattern and each corresponding pixel point in the reference pattern by using an image matching algorithm, and further obtains the depth image of the laser pattern according to the deviation value. The Image matching algorithm may be a Digital Image Correlation (DIC) algorithm. Of course, other image matching algorithms may be employed instead of the DIC algorithm. The structure of the structured light projection module 10 will be further described below.
Referring to fig. 3, the structured light projection module 10 includes a substrate assembly 11, a lens barrel 12, a light source 13, a reflective element 14, a collimating element 15, and a diffractive optical element 16. The reflecting element 14 is used for changing the optical path of the laser light emitted by the light source 13, and specifically, the laser light emitted by the light source 13 passes through the collimating element 15 and the diffractive optical element 16 in sequence after being reflected by the reflecting element 14.
The substrate assembly 11 includes a substrate 111 and a circuit board 112 carried on the substrate 111. The substrate 111 is used to carry the lens barrel 12, the light source 13, and the circuit board 112. The material of the substrate 111 may be plastic, for example, the substrate 111 may be made of a single plastic material selected from Polyethylene Glycol Terephthalate (PET), Polymethyl Methacrylate (PMMA), Polycarbonate (PC), and Polyimide (PI). Thus, the substrate 111 is light in weight and has sufficient support strength.
The circuit board 112 may be any one of a printed circuit board, a flexible circuit board, and a rigid-flex board. The circuit board 112 may have a via hole 113, the via hole 113 may be used to accommodate the light source 13, a part of the circuit board 112 is covered by the lens barrel 12, and another part of the circuit board 112 extends out and may be connected with a connector 17, and the connector 17 may connect the structured light projection module 10 to a main board of the electronic device 1000 in the embodiment of fig. 1. In order to improve the heat dissipation efficiency, the substrate 111 may further be formed with a heat dissipation hole 1111, heat generated by the operation of the light source 13 or the circuit board 112 may be dissipated through the heat dissipation hole 1111, and the heat dissipation hole 1111 may be filled with a thermal conductive adhesive to further improve the heat dissipation performance of the substrate assembly 11.
The lens barrel 12 is disposed on the substrate assembly 11 and forms an accommodation cavity 121 together with the substrate assembly 11. Specifically, the lens barrel 12 may be connected to the circuit board 112 of the substrate assembly 11, and the lens barrel 12 and the circuit board 112 may be adhered by an adhesive to improve the air tightness of the accommodating chamber 121. Of course, the lens barrel 12 and the substrate assembly 11 may be connected in other specific ways, such as by a snap connection. The receiving cavity 121 may be used to receive components such as the collimating element 15 and the diffractive optical element 16, and the receiving cavity 121 forms a part of the optical path of the structured light projection module 10. In the embodiment of the present invention, the lens barrel 12 is a hollow cylinder, and the lens barrel 12 includes a barrel sidewall 122, and a barrel top 123 and a barrel bottom 124 opposite to each other.
The barrel sidewall 122 surrounds the receiving cavity 121. One opening of the accommodating cavity 121 is opened on the top 123 of the lens barrel, and the other opening is opened on the bottom 124 of the lens barrel. The barrel bottom 124 is bonded, e.g., glued, to the base plate assembly 11.
The lens barrel 12 further includes an annular stage 125. A ring-shaped stage 125 is disposed between the barrel top 123 and the barrel bottom 124. The ring-shaped platform 125 extends from the inner periphery of the barrel sidewall 122 to the receiving cavity 121. The ring-shaped susceptor 125 forms a light-passing hole 126 communicating with the housing chamber 121.
The light source 13 is disposed on the substrate assembly 11 and received in the receiving cavity 121, specifically, the light source 13 may be disposed on the circuit board 112 and electrically connected to the circuit board 112, and the light source 13 may also be disposed on the substrate 111 and received in the via 113, at this time, the light source 13 may be electrically connected to the circuit board 112 by arranging a wire. The light source 13 is used to emit laser light, which may be infrared laser light. The light source 13 includes a first laser generator 131 and a second laser generator 132.
The first laser generator 131 is for emitting first laser light a. The first laser generator 131 is carried on the substrate assembly 11. Specifically, the first laser generator 131 emits in a direction in which the periphery of the substrate assembly 11 is directed toward the center of the substrate assembly 11.
The second laser generator 132 is for emitting second laser light b. The second laser generator 132 is carried on the substrate assembly 11 and is disposed opposite to the first laser generator 131. Specifically, the second laser generator 132 emits the second laser light b in a direction in which the periphery of the substrate assembly 11 is directed toward the center of the substrate assembly 11. The first laser a and the second laser b are opposite in direction. The term "opposite" as used herein means that the first laser beam a and the second laser beam b are opposite in direction, and means that the first laser beam a and the second laser beam b form an angle, for example, any angle between 0 ° and 180 ° (excluding 0 ° and 180 °).
The reflection element 14 is disposed on the substrate assembly 11 and received in the receiving cavity 121, and specifically, the first laser generator 131 and the second laser generator 132 are disposed on opposite sides of the reflection element 14, that is, the reflection element 14 is disposed between the first laser generator 131 and the second laser generator 132. The reflective element 14 faces the light passing hole 126, and one or more layers of materials capable of reflecting light, such as metal (silver, aluminum, tin), alloy or metal compound thin film, are disposed on the reflective element 14. The reflective element 14 is used for reflecting the first laser beam a and the second laser beam b in the same direction. Specifically, the first laser generator 131 emits the first laser light a toward the reflection element 14, and the second laser generator 132 emits the second laser light b toward the reflection element 14. The first laser a is reflected by the reflection surface of the reflection element 14, and the second laser b is reflected by the reflection element 14, and the two are converged to form converged laser c, and the converged laser c is emitted in the same direction. The converged laser c is the superposition of the laser reflected by the first laser a and the laser reflected by the second laser b. The laser pattern formed by converging the laser light c has high uniqueness including the uniqueness of the shape, size, arrangement position and the like of the laser pattern formed by converging the laser light c, for example, in fig. 3, the uniqueness of the laser pattern formed by the first laser light a alone and the laser pattern formed by the second laser light b alone is smaller than that of the laser pattern formed by converging the laser light c, so that the laser pattern formed by converging the laser light c has high irrelevancy.
The collimating element 15 may be an optical lens, the collimating element 15 is used for collimating the laser emitted by the light source 13, the collimating element 15 is accommodated in the accommodating cavity 121, and the collimating element 15 may be assembled into the lens barrel 12 from the barrel bottom 124. The collimating element 15 includes an optical portion 151 and a combining portion 152, the combining portion 152 is used for combining with the barrel sidewall 122 to fix the collimating element 15 in the accommodating cavity 121, in the embodiment of the present invention, the optical portion 151 includes two curved surfaces located on two opposite sides of the collimating element 15. The combining part 152 is abutted against the ring-shaped bearing platform 125, and one of the curved surfaces of the optical part 151 extends into the ring-shaped light through hole 126. Thus, the ring-shaped supporting platform 125 can support the diffractive optical element 16 without increasing the thickness of the structured light projection module 10, and can also space the collimating element 15 and the diffractive optical element 16.
The diffractive optical element 16 may project the laser light collimated by the collimating element 15 into a laser light pattern. The diffractive optical element 16 is accommodated in the accommodation chamber 121 and is carried on the ring-shaped carrier table 125. Specifically, the diffractive optical element 161 includes a first surface 161 and a second surface 162 that are opposite. The first surface 161 has a diffraction structure formed thereon. The first face 161 faces the collimating element 15, and the first face 161 may be bonded to the ring-shaped carrier table 125 by gluing. The condensed laser light c passes through the collimator element 15 and the diffractive optical element 16 in this order, and is emitted from the lens barrel 12. The laser collimated by the collimating element 15 is diffracted by the diffraction structure to form a laser pattern corresponding to the diffraction structure. The diffractive optical element 16 may be made of glass or may be made of a composite plastic (e.g., PET).
In summary, in the structured light projection module 10, the image capturing apparatus 100, and the electronic device 1000 according to the embodiment of the invention, the first laser a emitted by the first laser generator 131 and the second laser b emitted by the second laser generator 132 are reflected by the reflective element 14 and then converged, and the irrelevance of the laser pattern formed by the converged laser c is higher than that of the laser pattern formed by a single laser generator, so as to improve the measurement accuracy of the structured light projection module 10.
Referring to fig. 4, in some embodiments, the reflective element 14 is a prism. The reflective element 14 includes two first and second reflective portions 141 and 142 located inside the prism and intersecting each other. The first reflecting part 141 has a reflecting surface facing the first laser generator 131 to reflect the first laser light a, and the second reflecting part 142 has a reflecting surface facing the second laser generator 132 to reflect the second laser light b. In particular, the reflective element 14 may be a regular single prism. In the embodiment shown in fig. 5, the reflective element 14 may also be an irregular single prism. Referring to fig. 3, the first laser generator 131 emits a first laser a toward the reflective surface of the first reflective portion 141, the second laser generator 132 emits a second laser b toward the reflective surface of the second reflective portion 142, the first laser a is reflected by the reflective surface of the first reflective portion 141, the second laser b is reflected by the reflective surface of the second reflective portion 142, and the first laser a and the second laser b are converged to form a converged laser c, and the converged laser c sequentially passes through the collimating element 15 and the diffractive optical element 16.
The reflectance of the reflection surface of the first reflection portion 141 and the reflectance of the reflection surface of the second reflection portion 142 may be the same, and both the reflectances may be, for example, 50%, 80%, 90%, or the like. The reflectance of the reflection surface of the first reflection portion 141 and the reflectance of the reflection surface of the second reflection portion 142 may be different, and for example, the reflectance of the reflection surface of the first reflection portion 141 is any value between 50% and 70%, and the reflectance of the reflection surface of the second reflection portion 142 is any value between 80% and 90%.
In addition, the first reflection portion 141 and the second reflection portion 142 may be perpendicular to each other, and at this time, even if the central light of the first laser a and the central light of the second laser b are not on the same straight line, the light of the first laser a reflected by the reflection surface of the first reflection portion 141 and the light of the second laser b reflected by the reflection surface of the second reflection portion 142 may be overlapped, so that the laser pattern projected by the structured light projection module 10 is more concentrated, and thus, the structured light projection module 10 is suitable for a scene far from the target object without increasing the power of the light source 13. Of course, the reflection surface of the first reflection portion 141 and the reflection surface of the second reflection portion 142 may form an angle of any one of 0 ° to 180 ° (excluding 0 ° and 180 °), for example, 45 °, 60 °, 120 ° and 150 °, in which case, the light of the first laser light a reflected by the reflection surface of the first reflection portion 141 and the light of the second laser light b reflected by the reflection surface of the second reflection portion 142 are staggered, so as to weaken the zero-order intensity of the converged laser light. Like this, the module 10 is thrown to structured light is applicable to the nearer scene of distance target object, for example to the eyes that the module 10 user was thrown to structured light, and the weak laser pattern of zero level light intensity can avoid hurting user's eyes.
Referring to fig. 6, in some embodiments, the reflective element 14 is a prism. The reflection element 14 includes two first reflection surfaces 143 and second reflection surfaces 144 located outside the prism, the first reflection surfaces 143 are opposite to the first laser generator 131 to reflect the first laser light a, and the second reflection surfaces 144 are opposite to the second laser generator 132 to reflect the second laser light b. Specifically, the reflecting element 14 may be a triangular prism, and the first reflecting surface 143 and the second reflecting surface 144 are planes intersecting on the triangular prism. Referring to fig. 3, the first laser generator 131 emits the first laser light a toward the first reflective surface 143, and the second laser generator 132 emits the second laser light b toward the second reflective surface 144. The first laser beam a is reflected by the first reflecting surface 143 to form a first reflected laser beam a ', and the second laser beam b is reflected by the second reflecting surface 144 to form a first reflected laser beam b'. The first reflected laser light a 'and the second reflected laser light b' together form a converged laser light c. The condensed laser light c passes through the collimator element 15 and the diffractive optical element 16 in this order. The first reflected laser light a 'and the second reflected laser light b' may be overlapped or parallel to each other. The reflectance of the first reflecting surface 143 may be the same as or different from the reflectance of the second reflecting surface 144. Furthermore, the first reflecting surface 143 may be perpendicular to the second reflecting surface 144 to increase the zero-order intensity of the converged laser light, thereby increasing the detection distance. The first reflecting surface 143 and the second reflecting surface 144 may form an angle between 0 ° and 180 ° (excluding 0 ° and 180 °) to reduce the zero-order intensity of the converged laser light, thereby protecting the eyes of the user.
Referring to fig. 7, in some embodiments, reflective element 14 includes a first prism 145 and a second prism 146. The first prism 145 includes a first reflection surface 143, the second prism 146 includes a second reflection surface 144, the first reflection surface 143 is opposite to the first laser generator 131 to reflect the first laser light a, and the second reflection surface 144 is opposite to the second laser generator 132 to reflect the second laser light b. Specifically, the first prism 145 and the second prism 146 may be two prisms separated from each other, the first prism 145 has a first reflection surface 143, and the second prism 146 has a second reflection surface 144. Referring to fig. 3, the first laser generator 131 emits the first laser light a toward the first reflective surface 143, and the second laser generator 132 emits the second laser light b toward the second reflective surface 144. The first laser beam a is reflected by the first reflecting surface 143 to form a first reflected laser beam a ', and the second laser beam b is reflected by the second reflecting surface 144 to form a first reflected laser beam b'. The first reflected laser light a 'and the second reflected laser light b' together form a converged laser light c. The condensed laser light c passes through the collimator element 15 and the diffractive optical element 16 in this order. The first reflected laser light a 'and the second reflected laser light b' may be overlapped or parallel to each other. In addition, the first reflecting surface 143 may be perpendicular to the second reflecting surface 144 to increase the zero-order intensity of the condensed laser light, and increase the detection distance. The first reflecting surface 143 and the second reflecting surface 144 may form an angle between 0 ° and 180 ° (excluding 0 ° and 180 °) to reduce the zero-order intensity of the converged laser light, thereby protecting the eyes of the user. In other embodiments, the first prism 145 and the second prism 146 may also be combined prisms, for example, the first prism 145 and the second prism 146 are disposed on a prism base, so that the first prism 145 and the second prism 146 can be better carried on the substrate assembly 11 in the embodiment of fig. 3.
Referring to fig. 8, in some embodiments, the structured light projection module 10 further includes a protective cover 18. A protective cover 18 is incorporated with the lens barrel 12, the protective cover 18 being for restricting the position of the diffractive optical element 16, and in particular, the protective cover 18 being capable of blocking the diffractive optical element 16 from moving in the light outgoing direction of the light source 13. The protective cover 18 is disposed on the top 123 of the lens barrel, and opposite sides of the diffractive optical element 16 respectively abut against the protective cover 18 and the annular bearing platform 125.
Specifically, the protective cover 18 may be stuck on the lens barrel top 123 by glue to make the protective cover 18 more securely combined with the lens barrel 12. The protective cover 18 abuts against the second surface 162 of the diffractive optical element 16, thereby preventing the diffractive optical element 16 from falling off from the light transmission hole 126 in the light outgoing direction.
In certain embodiments, the protective cover 18 is made of a metallic material, such as nano-silver wire, metallic silver wire, copper sheet, or the like. The protective cover 18 made of a metal material is opened with a light transmitting hole 181. The position of the light hole 181 corresponds to the diffractive optical element 16, and the laser light sequentially passes through the collimating element 15, the light hole 126, the diffractive optical element 16, and the light hole 181 and then is emitted from the structured light projection module 10. In the embodiment of the present invention, the light transmission hole 181 may have a regular polygon shape, a circular shape, a rectangular shape, an oval shape, a trapezoidal shape, or the like. The aperture size of the light-transmitting hole 181 is smaller than at least one of the width or the length of the diffractive optical element 16 to restrict the position of the diffractive optical element 16. In other embodiments, the protective cover 18 may also be made of a light-transmissive material, such as glass, Polymethyl Methacrylate (PMMA), Polycarbonate (PC), Polyimide (PI), and the like. Since the transparent materials such as glass, PMMA, PC, PI, etc. have excellent light transmittance, the protective cover 18 does not need to be provided with the light transmittance hole 181.
Referring to fig. 3, in some embodiments, the first Laser generator 131 and the second Laser generator 132 are Edge-Emitting lasers (EEL) 133. The edge-emitting Laser 133 may be a Distributed Feedback Laser (DFB). When the laser of the distributed feedback laser propagates, the gain of power is obtained through the feedback of the grating structure. To improve the power of the distributed feedback laser, the injection current needs to be increased and/or the length of the distributed feedback laser needs to be increased, which may increase the power consumption of the distributed feedback laser and cause serious heat generation.
Referring to fig. 4, in particular, the first laser generator 131 includes a first light emitting surface 1311 and a first combining surface 1312. The first light emitting surface 1311 is an end surface of the first laser generator 131 away from the barrel sidewall 122, and the first coupling surface 1312 is an end surface of the first laser generator 131 coupled to the substrate assembly 11. The first laser light a is emitted from the first light emitting section 1311. The second laser generator 132 includes a second light emitting surface 1321 and a second bonding surface 1322. The second light emitting surface 1321 is an end surface of the second laser generator 132 away from the barrel sidewall 122, and the second engaging surface 1322 is an end surface engaged with the substrate assembly 11. The first laser light a is emitted from the first light emitting section 1311. The second laser light b is emitted from the second light emitting surface 1321. The first light emitting surface 1311 and the second light emitting surface 1321 face the reflective element 14. Adopt limit emission laser as light source 13, on the one hand because limit emission laser is single-point emitting structure, simple manufacture need not to make the array structure, and the light source cost of module 10 is lower in the structure light, and on the other hand, the laser of limit emission laser 133 transmission is more concentrated moreover, need not to use the great reflecting element 14 of volume just can reflect most first laser a and second laser b.
Referring to fig. 9, in some embodiments, the light source 13 in the embodiment of fig. 8 uses an edge-Emitting Laser 133, and may also use a Vertical-Cavity Surface-Emitting Laser (VCSEL) 134, that is, the first Laser generator 131 and the second Laser generator 132 are Vertical-Cavity Surface-Emitting lasers 134. The vertical cavity surface emitting laser 134 includes a semiconductor substrate and a VCSEL array disposed on the substrate. Specifically, the vertical cavity surface emitting laser 134 includes opposite emitting surfaces 1341, mounting surfaces 1342, and connection surfaces 1343. The emitting surface 1341 is an end surface of the vertical cavity surface emitting laser 134 facing away from the barrel sidewall 122. The emission surface 1341 faces the reflection element 14, the mounting surface 1342 is connected to the substrate assembly 11, and the connection surface 1343 is connected to the emission surface 1341 and the mounting surface 1342. The vcsel 134 is a new type of vertical surface emitting laser, and compared with a conventional edge emitting type of laser, such as a distributed feedback laser, the vcsel 134 has a light emitting direction perpendicular to the substrate, so that integration of a high-density two-dimensional area array can be easily achieved, and higher power output can be achieved; meanwhile, the coupling efficiency of the VCSEL and the optical fiber is high, so that a complex and expensive light beam shaping system is not needed, the manufacturing process is compatible with the light emitting diode, and the production cost is greatly reduced.
Referring to fig. 3 and 9, in some embodiments, the structured light projection module 10 further includes a fixing member 19, and the fixing member 19 is used to fix the first laser generator 131 and the second laser generator 132 on the substrate assembly 11. When the first laser generator 131 and the second laser generator 132 are both vertical cavity surface emitting lasers 134, since the light emitting direction of the vertical cavity surface emitting lasers 134 is perpendicular to the substrate, and when the emitting surfaces 1341 of the two vertical cavity surface emitting lasers 134 face the reflective element 14, the vertical cavity surface emitting lasers 134 need to be placed vertically, and the vertical cavity surface emitting lasers 134 are prone to falling, shifting or shaking, and other accidents, the vertical cavity surface emitting lasers 134 can be fixed by arranging the fixing member 19, and the vertical cavity surface emitting lasers 134 are prevented from falling, shifting or shaking and other accidents.
Referring to fig. 9, in some embodiments, the fixing element 19 is an encapsulant 191, and the encapsulant 191 is disposed between the mounting surface 1342 and the substrate assembly 11. The sealant 191 is only disposed between the mounting surface 1342 and the substrate assembly 11, which can reduce the amount of the sealant 191 required for bonding the vcsel 134, thereby reducing the manufacturing cost of the structured light projection module 10. Further, the sealant 181 may be a heat conductive sealant to conduct heat generated by the operation of the first laser generator 131 and the second laser generator 132 to the substrate assembly 11.
Referring to fig. 10, in some embodiments, the fixing member 19 includes at least two elastic supporting frames 192 disposed on the substrate assembly 11, and the at least two supporting frames 192 clamp the connection surface 1343 of the vcsel 134 to further prevent the vcsel 134 from wobbling.
In some embodiments, there are a plurality of first laser generators 131 and a plurality of second laser generators 132, and each first laser generator 131 is disposed opposite to one second laser generator 132. The plurality of first laser generators 131 emit a plurality of first laser beams a, the plurality of second laser generators 132 emit a plurality of second laser beams b, and the plurality of first laser beams a and the plurality of second laser beams b are reflected by the reflecting element 16 and then converged into converged laser beams c, so that the irrelevance of the converged laser beams c is further improved, and the detection precision of the structured light projection module 10 is improved.
In some embodiments, the intensity of the first laser light a is different from the intensity of the second laser light b. Specifically, the structured light projection module 10 further includes a controller capable of controlling the first laser generator 131 to emit the first laser a and controlling the second laser generator 132 to emit the second laser b. Specifically, the controller is configured to drive the first laser generator 131 and the second laser generator 132 to emit laser light. The controller may control the input current of the first laser generator 131 and the second laser generator 132. The larger the input current, the higher the intensity of the emitted laser light. For example, the first laser generator 131 emits the first laser light a with a light intensity of L1, and the second laser generator 132 emits the second laser light b with a light intensity of L2, where L1 ≠ L2. Thus, by controlling the intensity ratio of the first laser a and the second laser b, the converged laser c can obtain different shapes of light spots after sequentially passing through the collimating element 15 and the diffractive optical element 16, and a laser pattern with high irrelevancy is generated. Of course, L1 may be L2.
In addition, since the light intensity of the first laser light a is different from that of the second laser light b, the laser projection distance is also different. The laser light is strong, the laser projection distance is long, the laser light intensity is small, and the laser projection distance is short, so the controller can also control the first laser generator 131 and the second laser generator 132 to emit laser according to the distance of the target object. In the embodiment of fig. 2, the controller may be the processor 30, i.e. the processor 30 may also be used to control the first laser generator 131 to emit the first laser light a and the second laser generator 132 to emit the second laser light b. Specifically, the image obtaining apparatus 100 initially obtains a depth image of the target object, and the processor 30 controls to turn on or off the first laser generator 131 and the second laser generator 132 after determining the distance of the target object according to the depth image, so as to improve the service life of the first laser generator 131 and the second laser generator 132 and improve the detection precision. For example, the working power of the first laser generator 131 is greater than that of the second laser generator 132, and when it is determined that the target object is far away from the structured light projection module 10, the first laser generator 131 is turned on and the second laser generator 132 is turned off; when it is determined that the target object is closer to the structured light projection module 10, the second laser generator 132 is turned on and the first laser generator 131 is turned off. Of course, when the target object is determined to be far from the structured light projection module 10, the power of the first laser generator 131 may be increased, and the power of the second laser generator 132 may be decreased; when the target object is determined to be closer to the structured light projection module 10, the power of the second laser generator 132 may be increased, and the power of the first laser generator 131 may be decreased, so as to improve the irrelevance of the converged laser light c to improve the detection accuracy of the structured light projection module 10.
In some embodiments, the controller can also be capable of controlling the emission duration of the first laser generator 131 and the second laser generator 132. Specifically, the emission time period of the first laser generator 131 is T1, and the emission time period of the second laser generator 132 is T2. The controller may control the first laser generator 131 and the second laser generator 132 to alternately emit, for example, a first laser a emitted by the first laser generator 131 for a duration of T1, followed by a second laser b emitted by the second laser generator 132 for a duration of T2, and so on. Of course, time intervals Δ T1 and Δ T2 may be provided between T1 and T2, i.e., T1, Δ T1, T2, Δ T2, T1, and Δ T1 … may be cycled. In other embodiments, the controller may further control one of the first laser generator 131 and the second laser generator 132 to continuously emit laser light, and the other of the first laser generator 131 and the second laser generator 132 to emit laser light for an emission duration of T1 or T2.
In some embodiments, the first laser generator 131 emits a laser light pattern that is different from the laser light pattern of the second laser generator 132. The laser pattern is related to the type of its emitter. When the first laser generator 131 and the second laser generator 132 are both vertical cavity surface emitting lasers 134, the laser patterns of the first laser a and the second laser b can be changed by changing the density and the area of the VCSEL array disposed on the semiconductor substrate. For example, if the arrangement density of the VCSELs of the first laser generator 131 is greater than that of the VCSELs of the second laser generator 132, the irrelevance of the laser pattern emitted from the first laser generator 131 is higher than that of the laser pattern of the second laser generator 132. When both the first laser generator 131 and the second laser generator 132 are edge-emitting lasers 133, the edge-emitting lasers 133 may be manufactured as edge-emitting lasers 133 having different wavelengths and different operating powers.
In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.
Claims (12)
1. A structured light projection module, comprising:
a first laser generator for emitting first laser light;
a second laser generator disposed opposite the first laser generator, the second laser generator configured to emit a second laser;
the controller is used for controlling the intensity ratio of the laser emitted by the first laser emitter and the second laser emitter; and
the first laser generator and the second laser generator are respectively arranged on two opposite sides of the reflecting element, the first laser generator emits the first laser to the reflecting element, the second laser generator emits the second laser to the reflecting element, and the reflecting element is used for reflecting the first laser and the second laser to the same direction.
2. The structured light projection module of claim 1, wherein the reflective element is a prism, and the reflective element comprises a first reflective portion and a second reflective portion intersecting with each other and located inside the prism, wherein a reflective surface of the first reflective portion is opposite to the first laser generator to reflect the first laser light, and a reflective surface of the second reflective portion is opposite to the second laser generator to reflect the second laser light.
3. The structured light projection module of claim 1, wherein the reflective element is a prism, the reflective element comprises a first reflective surface and a second reflective surface, the first reflective surface and the second reflective surface are located outside the prism, the first reflective surface is opposite to the first laser generator to reflect the first laser light, and the second reflective surface and the second laser generator are opposite to each other to reflect the second laser light.
4. The structured light projection module of claim 1, wherein the reflective element comprises a first prism and a second prism, the first prism comprising a first reflective surface and the second prism comprising a second reflective surface, the first reflective surface opposing the first laser generator to reflect the first laser light and the second reflective surface opposing the second laser generator to reflect the second laser light.
5. The structured light projection module of claim 1, wherein the first laser generator and the second laser generator are edge emitting lasers, the first laser generator comprising a first light emitting face and the second laser generator comprising a second light emitting face, the first light emitting face and the second light emitting face both facing the reflective element.
6. The structured light projection module of claim 1, wherein the first laser generator and the second laser generator are vertical cavity surface emitting lasers.
7. The structured light projection module of claim 1, wherein the intensity of the first laser light is different from the intensity of the second laser light.
8. The structured light projection module of claim 1, wherein the laser pattern of the first laser is different from the laser pattern of the second laser.
9. The structured light projection module of claim 1, further comprising a substrate assembly and a lens barrel disposed on the substrate assembly and forming a receiving cavity together with the substrate assembly, wherein the first laser generator, the second laser generator, and the reflective element are disposed on the substrate assembly and received in the receiving cavity.
10. The structured light projection module according to claim 9, further comprising a collimating element and a diffractive optical element disposed in the lens barrel, wherein the first laser and the second laser are reflected by the reflecting element and then converged to form converged laser, and the converged laser sequentially passes through the collimating element and the diffractive optical element.
11. An image acquisition apparatus, characterized by comprising:
the structured light projection module of any of claims 1 to 10;
the image collector is used for collecting the laser pattern projected by the structured light projection module; and
and the processor is connected with the structured light projection module and the image collector respectively and is used for processing the laser pattern to obtain a depth image.
12. An electronic device, comprising:
a housing; and
the image acquisition device of claim 11, disposed within and exposed from the housing to acquire a depth image.
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| JP5588310B2 (en) * | 2009-11-15 | 2014-09-10 | プライムセンス リミテッド | Optical projector with beam monitor |
| US20160025993A1 (en) * | 2014-07-28 | 2016-01-28 | Apple Inc. | Overlapping pattern projector |
| US9503708B2 (en) * | 2014-11-03 | 2016-11-22 | Aquifi, Inc. | Systems and methods for reducing z-thickness and zero-order effects in depth cameras |
| CN107490930B (en) * | 2017-09-01 | 2020-12-18 | 深圳奥比中光科技有限公司 | Laser projection device with suppression of zero-order diffraction |
| CN107589623A (en) * | 2017-09-19 | 2018-01-16 | 深圳奥比中光科技有限公司 | Highdensity structured light projection instrument |
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