CN109683439B - Optical projection module, sensing device, equipment and optical projection module assembling method - Google Patents
Optical projection module, sensing device, equipment and optical projection module assembling method Download PDFInfo
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- CN109683439B CN109683439B CN201811526683.9A CN201811526683A CN109683439B CN 109683439 B CN109683439 B CN 109683439B CN 201811526683 A CN201811526683 A CN 201811526683A CN 109683439 B CN109683439 B CN 109683439B
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2545—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with one projection direction and several detection directions, e.g. stereo
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
- H05K1/0281—Reinforcement details thereof
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The application is applicable to the technical field of optics and electronics, and provides an optical projection module which is used for projecting a patterned light beam with a preset pattern onto a measured object to perform three-dimensional sensing and comprises a light source, a circuit board, a reinforcing plate, a lens cone and an optical element arranged on the lens cone. The light source is arranged on the circuit board and is electrically connected with the circuit board. The reinforcing plate is attached to the other side face, opposite to the light source, of the circuit board. The lens barrel is arranged on the surface of one side of the circuit board assembled with the light source and covers the light source. The optical element is aligned with the light source so that the light beam emitted by the light source is modulated by the optical element to form a patterned light beam with a preset pattern to be projected onto the measured object.
Description
Technical Field
The application belongs to the technical field of optics, and particularly relates to an optical projection module, a sensing device, equipment and an optical projection module assembling method.
Background
The existing three-dimensional (Three Dimensional, 3D) structure light emitting module has overlarge height in the light emitting direction, and cannot meet the trend of light and thin modules. On the other hand, the surface mounting process in the conventional module manufacturing process may also damage the lens barrel and the optical element disposed on the lens barrel due to high temperature.
Disclosure of Invention
The application provides an optical projection module, a sensing device, equipment and an optical projection module assembling method for solving the technical problems.
The embodiment of the application provides an optical projection module for projecting a patterned beam with a preset pattern onto a measured object for three-dimensional sensing, which comprises a light source, a circuit board, a reinforcing plate, a lens cone and an optical element arranged on the lens cone. The light source is arranged on the circuit board and is electrically connected with the circuit board. The reinforcing plate is attached to the other side face, opposite to the light source, of the circuit board. The lens barrel is arranged on the surface of one side of the circuit board assembled with the light source and covers the light source. The optical element is aligned with the light source so that the light beam emitted by the light source is modulated by the optical element to form a patterned light beam with a preset pattern to be projected onto the measured object.
In some embodiments, the reinforcing plate is made of a material having high thermal conductivity, selected from any one of a steel sheet, a copper sheet, and a combination thereof, and is used to increase the strength of the circuit board and dissipate heat from a light source on the circuit board.
In some embodiments, the lens barrel further comprises a protective cover plate, wherein the protective cover plate is arranged in the accommodating groove at one end of the lens barrel far away from the circuit board and is positioned on the light emergent side of the optical element.
In some embodiments, the lens barrel further comprises a passive component and a connector, wherein the passive component and the connector are arranged on the circuit board at a part positioned outside the lens barrel through a surface mounting process.
In certain embodiments, the optical element is selected from one of a collimating element, a beam expanding element, a microlens array, a grating, and a diffractive optical element, and combinations thereof.
In some embodiments, the light source includes a semiconductor substrate and a plurality of light emitting units formed on the semiconductor substrate, the light emitting units are distributed on the semiconductor substrate in a two-dimensional lattice form, a reference subarea exists in the light emitting units, and a product of a ratio value of a set of the light emitting unit subareas with a correlation coefficient greater than or equal to a preset threshold value to all the light emitting units and an average value of the correlation coefficients corresponding to the light emitting unit subareas in the set is greater than or equal to 0.25 and less than 1.
In some embodiments, the correlation coefficient is a normalized correlation coefficient, and the preset correlation coefficient threshold is 0.3.
The embodiment of the application provides a sensing device for sensing three-dimensional information of a measured object, which comprises a sensing module and the optical projection module in any one of the above embodiments, wherein the sensing module is used for sensing a preset pattern projected on the measured object by the optical module and acquiring the three-dimensional information of the measured object by analyzing an image of the preset pattern.
An embodiment of the present application provides an apparatus, including the sensing device described in the foregoing embodiment, where the apparatus performs a corresponding function according to three-dimensional information of a measured object sensed by the sensing device.
The embodiment of the application provides an assembly method of an optical projection module, the optical projection module comprises a light source, a circuit board, a passive element arranged on the circuit board, a reinforcing plate, a lens cone and an optical element arranged on the lens cone, and the assembly method comprises the following steps: an optical element is arranged on the lens barrel; attaching the reinforcing plate to the circuit board; a passive element is arranged on the circuit board through a surface mounting process; a light source is arranged on the circuit board; accurately fixing the relative position between the lens cone assembled with the optical element and the light source on the circuit board through active pairs; and fixing the lens barrel assembled with the optical element, which is well positioned on the circuit board, on the circuit board provided with the passive element and the light source through dispensing.
The optical projection module, the sensing device, the equipment and the assembly method of the optical projection module provided by the embodiment of the application utilize the light and thin reinforcing plate to increase the strength of the circuit board and radiate heat of the light source. Meanwhile, by adopting a mode that the lens barrel assembly and the circuit board assembly are separated and carried out synchronously, the assembly efficiency can be improved, and the risk of damage to the optical element 17 on the lens barrel 16 caused by high-temperature operation can be reduced.
Additional aspects and advantages of embodiments of the application 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 application.
Drawings
Fig. 1 is a schematic structural diagram of an optical projection module according to a first embodiment of the present disclosure.
Fig. 2 is a schematic view of the structure of the light source shown in fig. 1.
Fig. 3 is a schematic diagram of a light emitting unit distribution of the light source shown in fig. 1.
Fig. 4 is a schematic structural diagram of a sensing device according to a second embodiment of the present application.
Fig. 5 is a schematic structural view of an apparatus according to a third embodiment of the present application.
Fig. 6 is a flowchart illustrating steps of an assembling method of an optical projection module provided in the present application.
Fig. 7 is a schematic diagram of the structure of each step in fig. 6.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of this application, only the components and settings of a particular example are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the use of reference numerals and/or letters in the various examples is repeated herein for the purpose of simplicity and clarity of presentation and is not in itself an indication of a particular relationship between the various embodiments and/or settings discussed. In addition, the various specific processes and materials provided in the following description of the present application are merely examples of implementing the technical solutions of the present application, but one of ordinary skill in the art should recognize that the technical solutions of the present application may also be implemented by other processes and/or other materials not described below.
Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. It will be appreciated, however, by one skilled in the art that the subject matter of the present application may be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring aspects of the application.
As shown in fig. 1, a first embodiment of the present application provides an optical projection module for projecting a preset sensing light spot pattern onto a measured object for three-dimensional sensing. The optical projection module 1 includes a light source 12, a circuit board 14, a reinforcing plate 15, a lens barrel 16, an optical element 17 disposed on the lens barrel 16, and a protective cover 18 disposed on the light emitting side of the optical element 17. The light beam emitted by the light source 12 is modulated by the optical element 14 to form an emergent light beam with a preset pattern and then projected. The optical element 14 includes, but is not limited to, one of a collimating element, a beam expanding element, a microlens array, a grating, and a diffractive optical element (Diffractive Optical Elements, DOE), and combinations thereof.
In this embodiment, the optical projection module 1 is a three-dimensional sensing device for sensing three-dimensional data of a measured object. The light source 12 emits a set of light beams having a preset light field distribution. The light beam may be a light beam having a specific wavelength according to a sensing principle and an application scene. In this embodiment, the light beam is used to sense three-dimensional information of the measured object, and may be an infrared or near-infrared wavelength light beam with a wavelength ranging from 750 nanometers (nm) to 1650nm.
As shown in fig. 2, the light source 12 includes a semiconductor substrate 120, a plurality of light emitting units 122 formed on the semiconductor substrate 120, an anode 124, and a cathode 126. The light emitting unit 122 is a semiconductor structure capable of emitting light under the action of electric excitation, and is formed on the semiconductor substrate 120 through photolithography, etching, metal organic chemical vapor deposition, or the like. For example, the light emitting unit 122 may be, but is not limited to, a vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL). The anode 124 and the cathode 126 are respectively disposed on two opposite end surfaces of the semiconductor substrate 120, so as to induce a current signal to excite the light emitting unit 122 to emit light. The excitation current is greater than 1mA.
It is understood that in other embodiments, the light emitting unit 122 may also be a light emitting Diode (Light Emitting Diode, LED) or a Laser Diode (LD). Accordingly, the light emitting unit 122 is selected from any one of a VCSEL, an LED, and an LD, and a combination thereof.
As shown in fig. 3, the light emitting units 122 are distributed in a two-dimensional lattice in the light emitting region of the semiconductor substrate 120, wherein at least three adjacent light emitting units 122 are non-uniformly spaced on the semiconductor substrate 120. The entire light emitting units 122 have correlation as a whole.
The correlation of the arrangement pattern composed of the plurality of light emitting units 122 is generally evaluated by calculating a correlation coefficient f between the plurality of light emitting units 122 n To proceed if the calculated correlation coefficient f n Greater than or equal to a preset threshold, the light emitting units 122 are considered to have a correlation therebetween.
The correlation coefficient f n The calculation formula of (c) may be, but is not limited to, a normalized correlation coefficient formula (Normalized Correlation Coefficient, NCC) as follows:
wherein,the R is 0 For any selected light emitting unit 122 reference subarea among all light emitting units 122 on the semiconductor substrate 120 according to preset conditions, the light emitting unit 122 references the subarea R 0 Traversing the entire semiconductor substrate 120 light emitting region except R 0 Other than the reference sub-region R of the light emitting unit 122 is calculated 0 And the luminous unit subarea R passing through in the traversal process n Is of the correlation coefficient f of (2) n . Said-> H is the subregion R of the light-emitting unit 122 under consideration n W is the height of the considered sub-region R of the lighting unit 122 n Is a width of (c). The selected light emitting unit 122 refers to the sub-region R 0 The preset condition of (a) is that the selected lighting unit 122 reference sub-area includes a proportion of the number of lighting units 122 to the total number of all lighting units 122 that is greater than or equal to 10% or that the selected lighting unit 122 reference sub-area includes more than ten lighting units 122. The total number of all the light emitting units 122 is greater than or equal to 50.
It is understood that the light emitting unit 122 refers to the sub-region R 0 Traversing by adopting a translation mode in a plane rectangular coordinate system. In order to exclude the influence of the background area outside the light emitting units 122 in the arrangement pattern on the normalized correlation coefficient when calculating the normalized correlation coefficient of the light emitting units 122, the area of the light emitting units 122 is expanded with the center of the light emitting units 122 as the origin before calculation, so as to avoid that the normalized correlation coefficient calculated by the above formula cannot reflect the actual correlation between the light emitting units 122 due to the excessive specific gravity of the background area in the whole arrangement pattern when the physical size of the light emitting units 122 is small. For example, the light emitting unit 122 arrangement pattern with low correlation can also calculate a high normalized correlation coefficient. After the expansion of the area of the light emitting unit 122, the specific gravity of the background area is reduced, and the result is calculatedThe normalized correlation coefficient of the arrangement pattern of the light emitting units 122 can reflect the actual correlation between the light emitting units 122 to the maximum. The expansion of each light-emitting unit 122 area is performed in the same scale, and the expansion degree is enough that the adjacent light-emitting unit 122 areas do not overlap each other after expansion.
In addition, it is also possible to take only the reference subarea R of the light emitting unit 122 when the normalized correlation coefficient is calculated according to the above formula 0 And traversed luminous unit subarea R n Coordinates corresponding to the area occupied by the light emitting unit 122 are not taken from coordinates corresponding to the background area. That is, R (i, j) =1 (i, j takes the corresponding coordinates in the area occupied by the light emitting unit) to exclude the influence of the background area on the actual correlation of the light emitting unit 122 when calculating the normalized correlation coefficient.
It will be appreciated that in other embodiments, the light emitting unit 122 references the sub-region R 0 Traversal may also be performed in a polar coordinate system in a manner that rotates about the origin of coordinates.
Normalized correlation coefficient f calculated according to the normalized correlation coefficient formula n The value range of (2) is 0-f n And is less than or equal to 1. If f n =0, explaining the selected light-emitting unit 122 reference subarea R 0 The light emitting units 12 and the traversing light emitting unit 122 sub-region R n The light emitting units 12 in (a) are completely staggered without any coincidence, i.e. the light emitting units 122 refer to the sub-regions R 0 And the luminous unit 12 is divided into a region R n Completely uncorrelated.
If f n =1 describes the reference sub-region R of the selected light emitting cell 122 0 The light emitting units 12 and the traversing light emitting unit 122 sub-region R n The light-emitting units 122 in (a) are identical, i.e. the light-emitting units 122 refer to the sub-region R 0 And the luminous unit 122 sub-region R n Is completely correlated.
If 0 is<f n <1 illustrates a selected light-emitting cell 122 reference sub-region R 0 The light-emitting units 122 in (a) and the traversing light-emitting unit 122 sub-region R n The light emitting units 122 in (a) partially overlap, i.e. the light emitting units 122 refer toSub-region R 0 And the luminous unit 122 sub-region R n Partial correlation, the normalized correlation coefficient f n The larger the reference sub-region R of the selected light emitting unit 122 is illustrated 0 The light-emitting units 122 in (a) and the traversing light-emitting unit 122 sub-region R n The more the light emitting units 122 overlap each other, i.e. the light emitting units 122 refer to the sub-region R 0 And the luminous unit 122 sub-region R n The higher the correlation between them.
If the normalized correlation coefficient f n 0.3, the light-emitting unit 122 can be considered to refer to the sub-region R 0 And the luminous unit 122 sub-region R n In relation, the light emitting units 122 have a correlation therebetween. If the normalized correlation coefficient f n 0.5, the light-emitting unit 122 can be considered to refer to the sub-region R 0 And the luminous unit 12 is divided into a region R n Highly correlated, the light emitting units 12 have a high correlation therebetween.
In this embodiment, the correlation coefficient is a normalized correlation coefficient f n The preset threshold is 0.3, i.e. the light emitting unit 122 refers to the sub-region R 0 If there is a normalized correlation coefficient f calculated in the traversal process n Not less than 0.3, or the light-emitting unit 12 refers to the sub-region R 0 Normalized correlation coefficient f calculated in traversal n Peak f of (2) n_max 0.3, the light emitting units 122 may be considered to have a correlation as a whole.
In evaluating the correlation between the light emitting units 122, the ratio of the light emitting units 122 greater than or equal to a preset normalized correlation coefficient threshold to the total light emitting units 122 is considered in addition to the normalized correlation coefficient of the light emitting units 122 to more objectively evaluate the correlation between the light emitting units 122.
Thereby, a correlation intensity function for evaluating the correlation intensity between the light emitting units 122 is definedWherein a is a correlation with a correlation coefficient greater than or equal to a predetermined correlationThe ratio of the light-emitting units 22 with the number threshold to the total light-emitting units 122 is calculated as +.>P＝{R 0 ,R 1 ,…,R N (wherein R is) 0 For the light emitting unit 122 selected according to the preset condition, the sub-area R is referenced by the light emitting unit 22 0 Traversing the entire semiconductor substrate 120 light emitting area and calculating the light emitting unit 122 reference sub-area R 0 With the whole semiconductor substrate 120 except R 0 Correlation coefficients of other parts than the N and R are assumed to exist 0 Sub-regions of the light emitting unit 122 having a correlation coefficient greater than or equal to a preset correlation coefficient threshold, respectively denoted as R 1 ,…,R N Then the P represents the reference sub-region R of the light emitting unit 122 and the entire light emitting region of the semiconductor substrate 120 0 The set { R of all the light emitting units 122 having a correlation coefficient therebetween greater than or equal to a preset correlation coefficient threshold 0 ,R 1 ,…,R N -said set p= { R 0 ,R 1 ,…,R N The light emitting units 122 in the case have correlation therebetween. The S is a set of all light emitting units on the entire semiconductor substrate 120. The ratio may be, but is not limited to, a ratio of the number of the related light emitting units 122 to the total number of all the light emitting units 122, or a ratio of the area of the related light emitting units 122 to the total surface of the whole light emitting area, which may be selected according to practical situations.
The P and S may be the number of light emitting units 122 in the corresponding set of light emitting units 122. If the light emitting units 122 are uniformly distributed, the P and S may be areas corresponding to the areas where the light emitting units 122 are collected. It will be appreciated that the calculations of P and S herein are for R 0 ,R 1 ,…,R N The overlap that may occur in (a) is calculated only once and is not repeated.
The saidFor the set p= { R 0 ,R 1 ,…,R N All light-emitting unit 122 sub-regions R within } n (0<n.ltoreq.N) and the light-emitting unit 122 reference subarea R 0 Normalized correlation coefficient f between n Average value of (2), calculated asWherein f n Is R n (0<N is less than or equal to N) and R 0 Normalized correlation coefficient between.
In the present embodiment, since the preset correlation coefficient threshold is 0.3, i.e. when f n When not less than 0.3, the corresponding sub-region R of the light-emitting unit 122 is considered n (0<n.ltoreq.N) and the selected light-emitting cell 122 reference sub-region R 0 With a correlation between the sub-areas R of the light-emitting units 122 n (0<n.ltoreq.N) may be applied to the correlation strength function defined aboveTo evaluate the overall correlation of all light emitting cells 122 on the semiconductor substrate 120.
The a is the proportion of the related light-emitting units 122 to the total light-emitting units 122, so that a is more than or equal to 0 and less than or equal to 1. The saidFor normalizing the correlation coefficient f n Average value of (2), so->Therefore, the correlation intensity function->The calculated correlation intensity value F also meets the value range of 0-1. As defined herein, if the correlation strength value F satisfies 0.ltoreq.F<0.1, all light emitting cells 122 on the semiconductor substrate 120 are not related as a whole. If the correlation strength value F satisfies 0.1.ltoreq.F<0.25, all the light emitting cells 122 on the semiconductor substrate 20 are weakly correlated as a whole. If the correlation strength isThe value F satisfies 0.25.ltoreq.F<0.5, all the light emitting cells 122 on the semiconductor substrate 120 have a correlation as a whole. If the correlation intensity value F satisfies 0.5.ltoreq.F.ltoreq.1, all the light emitting cells 122 on the semiconductor substrate 120 are strongly correlated as a whole.
It will be appreciated that for the same light emitting unit 122 arrangement pattern on the semiconductor substrate 120, the calculated correlation intensity value F may be associated with the light emitting unit 122 reference sub-region R selected during the calculation 0 Is not always consistent, so that the sub-region R is referenced according to all the light emitting units 122 satisfying a preset condition in judging the correlation intensity of all the light emitting units 122 on the semiconductor substrate 120 as a whole 0 The maximum value of the calculated correlation intensity values F is determined. That is, as long as there is a reference sub-region R of the light emitting unit 122 selected according to a preset condition 0 So that the sub-region R is referenced according to the light emitting unit 122 0 The calculated correlation intensity value F satisfies the above-defined correlation intensity corresponding range, so that the light emitting units 122 on the semiconductor substrate 120 can be regarded as having corresponding correlation intensities as a whole.
In the present embodiment, all the light emitting units 122 on the semiconductor substrate 120 have correlation as a whole. The maximum value F of the correlation intensity values F of the whole light emitting units 122 max Greater than or equal to 0.25 and less than 1. I.e. there is a reference sub-region R of the lighting unit 122 selected according to preset conditions 0 The calculated correlation strength value F is greater than or equal to 0.25 and less than 1.
It is understood that in other embodiments, all of the light emitting cells 122 on the semiconductor substrate 120 have strong correlation as a whole. The maximum value F of the correlation intensity values F of the whole light emitting units 122 max Greater than or equal to 0.5 and less than 1. I.e. there is a reference sub-region R of the lighting unit 122 selected according to preset conditions 0 The calculated correlation strength value F is greater than or equal to 0.5 and less than 1.
As shown in fig. 1, the light source 12 is disposed on a circuit board 14 and is electrically connected to the circuit board 14. Specifically, in the present embodiment, the light source 12 is fixed on the circuit board 14 by dispensing, and is electrically connected to a corresponding circuit node on the circuit board 14 by wire bonding. The circuit board 14 may be a flexible circuit board, a rigid-flex board, or a rigid board. It will be appreciated that the circuit board 14 is further provided with a connector 11 for connection to external electricity and one or more passive components 13. The connector 11 and passive components 13 are disposed on the circuit board 14 by a surface mount (Surface Mounted Technology, SMT) process.
The reinforcing plate 15 is disposed on the other side surface of the circuit board 14 opposite to the light source 12. The reinforcing plate 15 is used for enhancing the strength of the circuit board 14 and simultaneously radiating the light source on the circuit board 14. The material of the reinforcing plate 15 is selected from steel sheet, copper sheet, and other metals with high thermal conductivity. The reinforcing plate 15 is adhered to the circuit board 14 through heat conducting glue.
The lens barrel 16 is a hollow cylinder, which may be square, rectangular, cylindrical or other suitable structure. The lens barrel 16 is provided on a side surface of the circuit board 14 on which the light source 12 is assembled, the light source 12 being housed within the lens barrel 16. The lens barrel 16 includes a first end 160 connected to the circuit board 14 and a second end 162 disposed opposite to the first end 160. The first end 160 is fixed to the circuit board 14 by dispensing. A receiving groove 164 is correspondingly formed at the second end 162 far away from the circuit board 14 for installing the optical element 17 and the protective cover 18. The lens barrel 16 may be made of one or more of heat conductive ceramics, plastics or alloy materials by injection molding or compression molding, or may be formed by separately processing into several parts and then combining them. In the present embodiment, the optical element 17 is a DOE.
Referring to fig. 4 and 5 together, a second embodiment of the present application provides a sensing device 2 for sensing three-dimensional information of a measured object. The three-dimensional information includes, but is not limited to, three-dimensional information of the surface of the measured object, position information of the measured object in space, size information of the measured object, and other three-dimensional information related to the measured object. The sensed spatial information of the measured object may be used to identify the measured object or to construct a three-dimensional model of the measured object.
The sensing device 2 includes the optical projection module 1 and the sensing module 20 provided in the first embodiment. The optical projection module 1 is used for projecting a preset sensing light spot pattern onto a measured object. The sensing module 20 includes a lens 21, an image sensor 22 and an image analysis processor 23. The image sensor 22 senses the sensing spot pattern projected onto the object to be measured through the lens 21. The image analysis processor 23 analyzes the sensed sensing light spot pattern to obtain three-dimensional information of the object to be measured.
In this embodiment, the sensing device 2 is a three-dimensional face recognition device that senses three-dimensional information on the surface of the object to be detected and recognizes the identity of the object to be detected accordingly.
The sensing module 2 analyzes three-dimensional information of the surface of the detected object according to the shape change of the preset light spot pattern projected on the detected object by the sensed light spot pattern and carries out face recognition on the detected object according to the three-dimensional information.
As shown in fig. 5, a third embodiment of the present application provides a device 3, such as a mobile phone, a notebook computer, a tablet computer, a touch interactive screen, a door, a vehicle, a robot, an automatic numerical control machine, and the like. The apparatus 3 comprises at least one sensing device 2 provided in the second embodiment described above. The device 3 is configured to correspondingly perform a corresponding function according to the sensing result of the sensing means 2. The corresponding functions include, but are not limited to, unlocking after identifying the identity of the user, paying, starting a preset application program, avoiding barriers, and judging any one or more of emotion and health conditions of the user by using a deep learning technology after identifying facial expressions of the user.
Compared with the prior art, the optical projection module, the sensing device and the equipment provided by the application adopt the laminating stiffening plate to increase the strength of the circuit board, have the heat dissipation function simultaneously, and have a simple and light and thin structure.
Referring to fig. 6 and fig. 7 together, the present application further provides an assembling method of the optical projection module 1, where the optical projection module 1 includes a light source 12, a circuit board 14, a reinforcing plate 15, a lens barrel 16, an optical element 17 disposed on the lens barrel, and a protective cover 18 disposed on a light emitting side of the optical element 17. The light beam emitted by the light source 12 is modulated by the optical element 17 to form an emergent light beam with a specific function and then projected. The assembly method comprises the following steps:
in step S01, an optical element 17 is provided on the lens barrel 16. The second end 162 of the lens barrel 16 is provided with a plurality of accommodating grooves 164 for assembly corresponding to the optical elements 17 and the protective cover plate 18, and the number of layers of the accommodating grooves 164 is determined according to the number of the optical elements 17 to be assembled. The optical element 17 is disposed relatively closer to the light source 12 and is assembled in the receiving groove 164 closer to the first end 160. The optical element 17 is fixed in the corresponding accommodating groove 164 by dispensing. The optical element 17 includes, but is not limited to, one of a collimating element, a beam expanding element, a microlens array, a grating, and a diffractive optical element (Diffractive Optical Elements, DOE), and combinations thereof. If there are a plurality of optical elements 17, they are sequentially assembled into the corresponding accommodation grooves 164 according to the optical path design. In this embodiment, the optical element is a DOE.
In step S02, a protective cover 18 is provided on the lens barrel 16. The protection cover 18 is disposed at the outermost side of the second end 162 of the lens barrel 16, and is assembled in the top-layer accommodating groove 164 of the second end 162. The protective cover plate 18 is fixed in the corresponding accommodating groove 164 by dispensing.
And step S03, attaching the reinforcing plate 15 to the circuit board 14. The reinforcing plate 15 is attached to the circuit board 14 through heat-conducting glue. The reinforcing plate 15 is used for increasing the strength of the circuit board 14, and meanwhile, the reinforcing plate 15 is made of high-heat-conductivity materials and can be used for radiating heat of the circuit board.
In step S04, the passive component 13 and/or the connector 11 are provided on the circuit board 14. The passive components 13 and/or the connectors 11 are mounted at corresponding positions on the circuit board 14 by an SMT process. The SMT process has high operation temperature up to 260 ℃.
In step S05, the light source 12 is disposed on the circuit board 14. The light source 12 is a light emitting chip, is fixed on the circuit board 14 by dispensing, and is electrically connected with the circuit board 14 by wire bonding.
In step S06, the relative position between the lens barrel 16 with the optical element 17 and the protective cover 18 assembled and the light source 12 on the circuit board 14 is determined by Active Alignment (AA). The active alignment adjusts the position of the lens barrel 16 in real time according to the imaging pattern formed by the light beam emitted by the light source 12 passing through the optical element, and positions the lens barrel 16 and the circuit board 14 according to the relative position when the optimal imaging pattern is obtained.
In step S07, the lens barrel 16 assembled with the optical element 17 and the protective cover 18, which is well positioned on the circuit board 14, is fixed on the circuit board 14 provided with the passive element 13 and the light source 12 by dispensing.
It is understood that step 01 and step 02 with respect to the assembly of the lens barrel 16 and step S03, step S04 and step S05 with respect to the assembly of the circuit board 14 may be simultaneously performed, respectively, to improve efficiency.
Compared with the prior art, the assembly method of the optical projection module 1 provided by the application can synchronously carry out the assembly of the circuit board 14 and the assembly of the lens barrel 16 which relate to high temperature, thereby improving the assembly efficiency and reducing the risk of preventing the damage of the optical element 17 on the lens barrel 16 caused by high-temperature operation.
In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (9)
1. An optical projection module is used for projecting a patterned light beam with a preset pattern onto a measured object to perform three-dimensional sensing, and comprises a light source, a circuit board, a reinforcing plate, a lens cone and an optical element, wherein the optical element is arranged on the lens cone;
the light source comprises a semiconductor substrate and a plurality of light emitting units formed on the semiconductor substrate, wherein the light emitting units are distributed on the semiconductor substrate in a two-dimensional lattice mode, a reference subarea selected according to preset conditions exists in the light emitting units, the product of the ratio value of a set formed by the light emitting unit subareas with the correlation coefficient larger than or equal to a preset threshold value between the reference subarea and all the light emitting units and the average value of the correlation coefficients corresponding to all the light emitting unit subareas in the set is larger than or equal to 0.25 and smaller than 1;
the preset condition of the selected light-emitting unit reference subarea is that the proportion of the number of the light-emitting units included in the selected light-emitting unit reference subarea to the total number of all the light-emitting units is more than or equal to 10% or the selected light-emitting unit reference subarea includes more than ten light-emitting units.
2. The optical projection module of claim 1, wherein the stiffener is made of a material having high thermal conductivity, selected from any one of a steel sheet, a copper sheet, and a combination thereof, and is used to increase the strength of the circuit board and dissipate heat from the light source on the circuit board.
3. The optical projection module of claim 1, further comprising a protective cover plate disposed in the accommodating groove at one end of the lens barrel away from the circuit board and located at the light emitting side of the optical element.
4. The optical projection module of claim 1, further comprising a passive component and a connector disposed on a portion of the circuit board outside the lens barrel by a surface mount process.
5. The optical projection module of claim 1, wherein the optical element is selected from the group consisting of a collimating element, a beam expanding element, a microlens array, a grating, and a diffractive optical element, and combinations thereof.
6. The optical projection module of claim 1, wherein: the correlation coefficient is a normalized correlation coefficient, and the preset correlation coefficient threshold is 0.3.
7. A sensing device for sensing three-dimensional information of a measured object, comprising a sensing module and the optical projection module according to any one of claims 1 to 6, wherein the sensing module is used for sensing a preset pattern projected by the optical projection module on the measured object and obtaining the three-dimensional information of the measured object by analyzing an image of the preset pattern.
8. An apparatus comprising the sensing device of claim 7, the apparatus performing a corresponding function based on three-dimensional information of a measured object sensed by the sensing device.
9. An assembling method of an optical projection module, the optical projection module includes a light source, a circuit board, a passive element arranged on the circuit board, a reinforcing plate, a lens cone and an optical element arranged on the lens cone, the assembling method includes the following steps:
an optical element is arranged on the lens barrel;
attaching the reinforcing plate to the circuit board;
a passive element is arranged on the circuit board through a surface mounting process;
a light source is arranged on the circuit board;
accurately fixing the relative position between the lens cone assembled with the optical element and the light source on the circuit board through active pairs; and
Fixing the lens barrel assembled with the optical element, which is well positioned on the circuit board, on the circuit board provided with the passive element and the light source through dispensing;
the step of arranging the optical element on the lens cone and the step of arranging the reinforcing plate, the passive element and the light source on the circuit board are respectively and synchronously performed to improve the assembly efficiency, and then the lens cone provided with the optical element and the circuit board provided with the reinforcing plate, the passive element and the light source are aligned and fixed to prevent the risk of damaging the optical element on the lens cone due to high-temperature operation.
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| CN110361870A (en) * | 2019-07-29 | 2019-10-22 | 深圳阜时科技有限公司 | A kind of optical module, transmitting unit, sensing mould group and electronic equipment |
| CN110426808B (en) * | 2019-08-06 | 2021-08-17 | 业成科技（成都）有限公司 | Lens module device |
| US11573485B2 (en) | 2019-09-03 | 2023-02-07 | Himax Technologies Limited | Projector, 3D sensing module and method for fabricating the projector |
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