CN117031860A - Linear laser projector, camera assembly and electronic device - Google Patents

Abstract

The application provides a linear laser projector, a camera assembly and an electronic device. The laser projector includes a substrate assembly, a plurality of laser light sources, and a diffractive optical element. The plurality of laser light sources are arranged on the substrate assembly and used for emitting laser, and the plurality of laser light sources are arranged in N rows along the direction perpendicular to the set straight line direction, wherein each row comprises the plurality of laser light sources arranged along the set straight line direction. The diffraction optical element is used for diffusing laser emitted by the laser light sources along a set linear direction, so that each row of laser light sources emits M linear projection patterns extending along the set linear direction, wherein N and M are positive integers greater than 1, and N multiplied by M linear projection patterns are arranged at intervals along a direction perpendicular to the set linear direction. Wherein, M linear projection patterns projected by any one of the N rows of laser light sources are adjacent along the direction perpendicular to the set straight line direction.

Description

In-line laser projectors, camera components and electronic devices

This application is a divisional application of the Chinese patent application with the application number CN202210977419.7 and the invention name "One-line laser projector, camera assembly and electronic device" submitted on August 15, 2022.

Technical field

The present application relates to the field of imaging technology, and in particular, to a laser projector, a camera assembly and an electronic device having the same.

Background technique

With the popularity of structured light, one-line laser projection systems are increasingly used in depth detection and 3D sensing in the industrial and consumer electronics industries, which requires one-line lasers to have narrower widths and higher uniformity. sex and higher brightness. At the same time, systems are becoming more and more miniaturized. Traditional one-line laser projection systems mostly use single-mode laser diodes (LD) as the light source of the one-line line. However, due to the good monochromaticity and coherence of laser, when the light of LD is irradiated on the rough surface of a general object, speckles will be formed on the surface of the object due to light interference, thus producing a granular structure inside the one-line light spot, reducing the The quality of a line directly affects the calculation results of depth detection and 3D perception. At present, the straight-shaped light output by conventional linear lasers cannot meet application requirements in terms of divergence angle, spot uniformity, and spot edge cutoff sharpness. In addition, current conventional one-line lasers are difficult to meet the specific requirements for one-line energy distribution in specific application scenarios.

Therefore, there is a need for a linear laser projector that can easily achieve a preset light intensity distribution (uniform or uneven) according to application requirements.

Application content

A series of concepts in simplified form are introduced in the application content section, which are further detailed in the detailed description section. The application content of this application does not mean an attempt to define the key features and necessary technical features of the claimed technical solution, nor does it mean an attempt to determine the protection scope of the claimed technical solution.

The first aspect of this application provides a linear laser projector, which includes:

base board components;

A plurality of laser light sources, the plurality of laser light sources are arranged on the substrate assembly for emitting laser, the plurality of laser light sources are arranged in N rows in a direction perpendicular to the set straight line direction, wherein each row includes a line along the A plurality of the laser light sources arranged in the set linear direction; and

Diffractive optical elements are used to diffuse the laser light emitted by the plurality of laser light sources along the set straight line direction to form N×M linear projection patterns extending along the set straight line direction, wherein, N is a positive integer, M is a positive integer greater than 1, and the N×M one-line projection patterns are arranged at intervals along a direction perpendicular to the set straight line direction.

According to this application, the diffractive optical element can cause the laser light source to project a linear projection pattern. The projection patterns of multiple laser light sources will be superimposed on each other and staggered from each other in the set linear direction to form the final linear projection pattern. . When diffractive optical elements are used to form a word line, the energy distribution (eg, uniform or uneven) of the one-word line projection pattern can be easily controlled so that the energy distribution of the final projection pattern meets the preset energy distribution requirements. At the same time, by adjusting the values of M and N, you can obtain different numbers of one-word lines and achieve different viewing angles in the direction perpendicular to the set straight line direction.

Optionally, the plurality of laser light sources are arranged in N rows at substantially equal intervals on the substrate assembly in a direction perpendicular to the set linear direction, where N is greater than 1.

According to the present application, the arrangement of multiple laser light sources is simple.

Optionally, in each row of the laser light source:

The number of laser light sources is 7 to 25, and/or

The plurality of laser light sources are distributed at approximately equal intervals.

Optionally, in each row of the laser light source:

The distance between two adjacent laser light sources is 20 μm to 40 μm, and/or

The total distribution width of the plurality of laser light sources is 150 μm to 600 μm.

Optionally, a linear projection pattern projected by a laser emitted by a single laser light source has a field of view angle along the set straight line direction of 40° to 130°.

According to this application, various parameters of the laser projector are set reasonably.

Optionally, the diffractive optical element is parallel to the substrate assembly, and the air gap between the laser light source and the diffractive optical element is 2 mm to 5.5 mm.

According to the present application, the diffractive optical element can have its own collimation function.

Optionally, the in-line laser projector is characterized in that it further includes a collimating lens, and the collimating lens is disposed between the laser light source and the diffractive optical element.

Further, the focal length of the collimating lens is 2 mm to 5.5 mm.

According to the present application, when the diffractive optical element does not have a collimating function, the light emitted by the laser light source is collimated through a collimating mirror.

Optionally, the laser light source is a vertical cavity surface emitting laser element.

According to this application, the laser light source is a vertical cavity surface emitting laser element, which can make the size of the projector smaller.

Optionally, the diffractive optical element includes a 2-step, 4-step or 8-step micro-nano structure.

According to the present application, the processing accuracy of the diffractive optical element can meet the projection needs.

Optionally, each of the one-line projection patterns includes transition areas at both ends and a middle area between the two transition areas, and the one-line laser projector is configured such that: the transition area The projection angle is 2° to 8°, and the unevenness of the intensity of the projected light in the middle area is less than 30%.

When it is necessary to project a one-word line with uniform light intensity distribution, the laser projector according to the present application can project a one-word line with uniform light spots and sharp spot edge cutoffs.

Optionally, the diffractive optical element is configured such that the intensity distribution of the projected light of each of the linear projection patterns satisfies a preset intensity distribution curve.

Further, each of the one-line projection patterns includes transition areas at both ends and a middle area located between the two transition areas, and the one-line laser projector is configured such that: the projection of the middle area The intensity of light is distributed according to the normalized intensity distribution of 1/(cosα) ^a , where a is a real number with a value range of (0, 1.5), and α is the diffraction angle of each point on the linear projection pattern.

The laser projector according to the present application can project a word line whose energy distribution meets the preset energy distribution requirements.

Optionally, the one-line laser projector is configured such that each row of the laser light sources projects M one-line projection patterns.

In this application, a row of laser light sources projects M straight lines, and the design of diffractive optical elements is simple.

Optionally, N is greater than 1, and the M one-line projection patterns projected by at least one row of N rows of laser light sources are different from at least one other row of N rows of laser light sources. The M straight-line projection patterns projected by the light source are staggered in a direction perpendicular to the set straight line direction.

further,

The one-line projection pattern described in the q-th row projected by the laser light source in the p-th row is recorded as a one-word line pq, p and q are integers, 1≤p≤N, 1≤q≤M,

The one-line laser projector is configured such that N×M one-line projection patterns have the following relationship:

The N word lines pq with the same q value are adjacent along the direction perpendicular to the set straight line direction;

The p values of N word lines pq with the same q value are arranged in reverse order according to the row number of the laser light source along the direction perpendicular to the set straight line direction.

According to this application, N×M one-word lines are regularly staggered, which is beneficial to simplifying the design of diffractive optical elements and troubleshooting faults.

optionally,

The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate assembly, and the diffractive optical elements are parallel to the substrate assembly,

The structural parameters of the laser projector satisfy the following formula (1):

Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, G, is the air gap between the laser light source and the diffractive optical element.

In this application, when the diffractive optical element has its own collimation function, designing the diffractive optical element according to formula (1) can achieve the above-mentioned effect of a regular staggered arrangement of word lines. At the same time, multiple viewing angles of N×M one-word lines along the direction perpendicular to the set straight line direction can also be determined.

or optionally,

The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate assembly. The one-line laser projector also includes a collimating mirror, and the collimating mirror disposed between the laser light source and the diffractive optical element,

The structural parameters of the laser projector satisfy the following formula (2):

Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, f is the focal length of the collimating lens.

In this application, when the diffractive optical element does not have a collimating function, designing the diffractive optical element according to formula (2) can achieve the above-mentioned effect of a regular staggered arrangement of word lines. At the same time, multiple viewing angles of N×M one-word lines along the direction perpendicular to the set straight line direction can also be determined.

Optionally, N is greater than 1, and the M straight-line projection patterns projected by any one of the N rows of laser light sources are adjacent along a direction perpendicular to the set straight line direction.

further,

The one-line projection pattern described in the q-th row projected by the laser light source in the p-th row is recorded as a one-word line pq, p and q are integers, 1≤p≤N, 1≤q≤M,

The one-line laser projector is configured such that N×M one-line projection patterns have the following relationship:

The M word lines pq with the same p value are adjacent along the direction perpendicular to the set straight line direction;

The p values of N word lines pq with the same q value are arranged in reverse order according to the row number of the laser light source along the direction perpendicular to the set straight line direction.

According to this application, N×M one-word lines are regularly arranged without staggering each other, which is beneficial to simplifying the design of diffractive optical elements and troubleshooting.

optionally,

The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate, and the diffractive optical elements are parallel to the substrate assembly,

The structural parameters of the laser projector satisfy the following formula (3):

Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, G, is the air gap between the laser light source and the diffractive optical element.

In this application, when the diffractive optical element has its own collimation function, designing the diffractive optical element according to formula (3) can achieve the above-mentioned effect of a regular non-staggered arrangement of word lines. At the same time, multiple viewing angles of N×M one-word lines along the direction perpendicular to the set straight line direction can also be determined.

or optionally,

The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate. The one-line laser projector also includes a collimating mirror, and the collimating mirror is configured Between the laser light source and the diffractive optical element,

The structural parameters of the laser projector satisfy the following formula (4):

Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, f is the focal length of the collimating lens.

In this application, when the diffractive optical element does not have a collimating function, designing the diffractive optical element according to formula (4) can achieve the above-mentioned effect of a regular non-staggered arrangement of word lines. At the same time, multiple viewing angles of N×M one-word lines along the direction perpendicular to the set straight line direction can also be determined.

Optionally, N=1, and the structural parameters of the laser projector satisfy the following formula (5):

Wherein, D is the minimum period of the diffractive optical element in the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, and θv is the two adjacent two adjacent lines in the M one-line projection pattern. The field of view angle along the direction perpendicular to the set straight line direction.

According to the present application, when N=1, there is a corresponding relationship between the structural parameters of the diffractive optical element and the field of view angles of M one-word lines.

A second aspect of the application provides a camera assembly, which includes:

The above-mentioned linear laser projector;

An image collector, used to collect the laser image formed by the pattern projected by the linear laser projector; and

A processor for processing the laser image to obtain a depth image.

The camera assembly according to the present application can easily project a word line whose light intensity distribution meets the preset light intensity distribution requirements (such as uniform or uneven) according to application needs, and capture and capture the laser image formed by the word line. deal with. At the same time, by adjusting the values of M and N, you can obtain different numbers of one-word lines and achieve different viewing angles in the direction perpendicular to the set straight line direction.

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

shell; and

The above-mentioned camera assembly is provided to the housing and exposed from the housing to obtain depth images.

The camera assembly according to the present application can easily project a word line whose front light distribution meets the preset light intensity distribution requirements (such as uniform or uneven) according to application needs, and capture and process the laser image formed by the word line. . At the same time, by adjusting the values of M and N, you can obtain different numbers of one-word lines and achieve different viewing angles in the direction perpendicular to the set straight line direction.

Description of the drawings

The following drawings of this application are hereby incorporated by reference and are incorporated into the understanding of this application. The accompanying drawings illustrate embodiments of the present application and their descriptions to explain the principles of the present application. In the attached picture:

Figure 1 is a schematic structural diagram of a linear laser projector according to the first preferred embodiment of the present application;

Figure 2 is a schematic diagram of a single laser light source projection pattern of the linear laser projector in Figure 1;

Figure 3 is a schematic diagram of a row of laser light source projection patterns of the linear laser projector in Figure 1;

Figure 4 is a schematic diagram of the projection effect of a row of laser light sources in Figure 3. For the purpose of illustration, the linear projection pattern formed by multiple superimposed single laser light sources is decomposed in space;

Figure 5 is an explanatory diagram of the arrangement of a row of laser light sources of a linear laser projector according to a specific embodiment of the present application, in which there are 9 laser light sources;

Figure 6 is a simulation diagram of a straight line projection pattern projected by a single laser light source in Figure 5, where the projection distance is 300mm;

Figure 7 is a simulation diagram of a linear projection pattern projected by a row of laser light sources in Figure 5, where the projection distance is 300mm;

Figure 8 is a schematic diagram of the energy distribution simulation of a line-by-line projection pattern projected by a single laser light source in Figure 5, where the energy value is the energy of each diffraction order at infinity;

Figure 9 is a schematic diagram of the energy distribution simulation of a straight line projection pattern projected by a row of laser light sources in Figure 5, where the energy value is the energy of each diffraction order at infinity;

Figure 10 is an explanatory diagram of the arrangement of all laser light sources of a linear laser projector according to an embodiment of the present application;

Figure 11 is a simulation diagram of a linear projection pattern projected by a single laser light source in Figure 10, where the projection distance is 300mm;

Figure 12 is a schematic diagram of a simulation of a linear projection pattern projected by all the laser light sources in Figure 10, where the projection distance is 300mm.

Figure 13 is an explanatory diagram of the arrangement of all laser light sources of a linear laser projector according to another specific embodiment of the present application;

Figure 14 is a simulation diagram of a linear projection pattern projected by a single laser light source in Figure 13, where the projection distance is 300mm;

FIG. 15 is a simulation diagram of a linear projection pattern projected by all the laser light sources in FIG. 13 , in which the projection distance is 300 mm.

Figure 16 is a schematic structural diagram of a linear laser projector modified according to the first preferred embodiment of the present application;

Figure 17 is a schematic structural diagram of a linear laser projector according to the second preferred embodiment of the present application;

Figure 18 is an explanatory diagram of the arrangement of all laser light sources of a linear laser projector according to yet another specific embodiment of the present application;

Figure 19 is a simulation diagram of a linear projection pattern projected by a single laser light source in Figure 18, where the projection distance is 300mm;

Figure 20 is a simulation diagram of a linear projection pattern projected by all the laser light sources in Figure 18, where the projection distance is 300mm;

Figure 21 is a schematic diagram of the energy distribution simulation of a straight line projection pattern projected by a single laser light source in Figure 18, where the energy value is the energy of each diffraction order at infinity;

Figure 22 is a schematic diagram of the energy distribution simulation of another straight line projection pattern projected by the single laser light source of Figure 21, in which the energy value is the energy of each diffraction order at infinity;

Figure 23 is a schematic diagram of the energy distribution simulation of a straight line projection pattern projected by the entire row of laser light sources in the row corresponding to the single laser light source in Figure 21, where the energy value is the energy of each diffraction order at infinity;

Figure 24 is a schematic diagram of the energy distribution simulation of another straight line projection pattern projected by the entire row of laser light sources in the row corresponding to the single laser light source in Figure 22, where the energy value is the energy of each diffraction order at infinity;

Figure 25 is a schematic diagram of the energy distribution simulation of the one-line projection pattern 65D1 in Figure 20, in which the energy value is the energy of each diffraction order at infinity;

Figure 26 is a schematic diagram of the energy distribution simulation of the one-line projection pattern 65B1 in Figure 20, in which the energy value is the energy of each diffraction order at infinity;

Figure 27 is a schematic diagram of the energy distribution simulation of the one-line projection pattern 65D2 in Figure 20, in which the energy value is the energy of each diffraction order at infinity;

Figure 28 is a schematic diagram of the energy distribution simulation of the one-line projection pattern 65B2 in Figure 20, in which the energy value is the energy of each diffraction order at infinity.

Explanation of reference symbols:

10: Substrate components

20: Laser light source

21/21A/21B/21C/21D: One row of laser light source

25: Laser beam

30: Diffractive optical elements

40: Collimating lens

50: projection screen

60: A straight line projection pattern projected by a single laser light source

65/65A1/65A2/65B1/65B2/65C1/65C2/65D1/65D2: A linear projection pattern projected by a row of laser light sources

100: One-line laser projector

Detailed ways

In the following description, numerous specific details are given in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced without one or more of these details. In other examples, some technical features that are well known in the art are not described in order to avoid confusion with the present application.

For a thorough understanding of the present application, detailed description will be set forth in the following description. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, implementation of the embodiments of the present application is not limited to specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other embodiments.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, it should also be understood that when the terms "comprising" and/or "includes" are used in this specification, they indicate the presence of features, integers, steps, operations, elements and/or components but do not exclude the presence or addition of a or multiple other features, integers, steps, operations, elements, components and/or combinations thereof.

Ordinal words such as "first" and "second" cited in this application are merely identifiers and do not have any other meaning, such as a specific order, etc. Furthermore, for example, the term "first component" does not by itself imply the presence of a "second component" and the term "second component" does not by itself imply the presence of a "first component".

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

A first aspect of the present application provides a linear laser projector.

As shown in FIG. 1 , in a first preferred embodiment, a linear laser projector 100 includes a substrate assembly 10 , a plurality of laser light sources 20 and a diffractive optical element 30 . Wherein, a plurality of laser light sources 20 are disposed on the substrate assembly 10 for emitting laser light. The plurality of laser light sources 20 are arranged in N rows (N is a positive integer, N=4 in the illustrated embodiment) along the direction Y perpendicular to the set linear direction A plurality of laser light sources 20 are arranged. The diffractive optical element 30 is used to diffuse the laser light emitted by the plurality of laser light sources 20 along the set linear direction X to form N×M (M is a positive integer greater than 1, M=2 in the illustrated embodiment) strip edge device A one-line projection pattern 65 extending in the fixed straight line direction X, wherein N×M one-line projection patterns 65 are arranged at intervals along the direction Y perpendicular to the set straight line direction X.

Specifically, as shown in FIG. 2 , one of the laser light sources 20 of the linear laser projector 100 can emit a laser beam 25 . The diffractive optical element 30 is configured such that the laser beam 25 forms M linear projection patterns 60 on the projection screen 50 after passing through the diffractive optical element 30 . In other words, the diffractive optical element 30 is configured to diffuse the laser light emitted by the single laser light source 20 in a line shape, the line line is diffused along the set linear direction X, and at the same time, the line line extending in the X direction is spread along the Y line The direction is copied into N strips spaced apart from each other. Among them, the field of view (FOV) of the linear projection pattern 60 projected by the laser emitted by the single laser light source 20 along the X direction is θs, and the field of view (FOV) of the two adjacent linear projection patterns 60 along the Y direction is θs. The field of view angle is θv. There is an air gap G between the laser light source 20 and the diffractive optical element 30 .

Taking a one-line projection pattern 60 projected by a single laser light source 20 as an example, as shown in FIGS. 3 and 4 , when each row of laser light sources 21 of the one-line laser projector 100 includes a line along a set straight line. When multiple laser light sources 20 are arranged at intervals in the direction Superimposed to form a superimposed one-line projection pattern 65. The plurality of one-line projection patterns 60 are mutually offset in the set linear direction X, so that the superposition result is similar to extending the one-line projection pattern 60 of a single laser light source 20 in the set linear direction X. Therefore, the one-line laser projector 100 is configured such that each row of laser light sources 21 projects M one-line projection patterns 65 .

The field of view (FOV) of the one-line projection pattern 60 projected by the laser emitted by a single laser light source 20 is θs. The one-line projection pattern 60 of multiple laser light sources 20 is superimposed to form a one-line projection. The pattern 65 has a viewing angle θf, θf>θs. It can be understood that the larger the total distribution width L of the plurality of laser light sources 20 in the same row is, the larger the viewing angle θf of the linear projection pattern 65 is.

The light intensity distribution characteristics of the linear projection pattern 60 or 65 are controlled by the diffractive optical element 30 . The diffractive optical element 30 can be configured to make the light intensity distribution of the linear projection pattern 60 as uniform as possible. As shown in FIG. 4 , a plurality of one-line projection patterns 60 are staggered from each other in the set linear direction The number of word line projection patterns 60 is large, and the number of single one-line type projection patterns 60 participating in superimposition at the parts located at opposite ends is small. Therefore, the light intensity distribution curve C of the superimposed linear projection pattern 65 is approximately trapezoidal. As shown in FIG. 4 , each linear projection pattern 65 includes transition regions at both ends (the viewing angle of the transition region is θb) and a middle region between the two transition regions (the viewing angle of the middle region is θb). θu), the light intensity in the middle area (the number of single one-line projection patterns 60 participating in the superposition is large) is higher than the light intensity in the transition area (the number of single one-line projection patterns 60 participating in the superposition is small), The light intensity in the middle area is basically evenly distributed, while the light intensity in the transition area becomes smaller closer to both ends. Among them, each field of view angle has the following quantitative relationship:

θb=arctg(L/G),

θf=θs+θb,

θu=θs-θb.

In this application, preferably, the straight-line laser projector 100 is configured such that the projection angle (ie, the viewing field angle θb) of the transition area of each straight-line projection pattern 65 is 2° to 8°, And the unevenness of the intensity of the projected light in the middle area is less than 30%.

For example, as shown in FIGS. 5 to 9 , each row of laser light sources 21 includes 9 laser light sources 20 , the 9 laser light sources 20 are equally spaced, and the total distribution width L is 500 μm (see FIG. 5 ). The air gap G between the laser light source 20 and the diffractive optical element 30 is 5 mm. The field angle θs of the linear projection pattern 60 projected by the laser emitted by the single laser light source 20 is 120° (see FIG. 6 ). The light intensity (energy) distribution of a linear projection pattern 60 projected by the laser emitted by a single laser light source 20 is as shown in FIG. 8 . When the projection lights of the nine laser light sources 20 are superimposed, comparing FIG. 6 with FIG. 7 , it can be seen that the field of view angle of the superimposed linear projection pattern 65 is significantly greater than 120°. The light intensity (energy) distribution of the superimposed linear projection pattern 65 is shown in Figure 9. Comparing Figure 8 with Figure 9, we can see that the light intensity uniformity after multi-point superposition has been significantly improved. The line width opening angle of the one-line projection patterns 60 and 65 is less than 0.05°.

In practical applications, cameras usually capture a line at a close distance (for example, within 10m). In this case, since the light spot itself has a certain size, adjacent signal points on a word line will be superimposed, resulting in mutual convolution. Convolution will make the light intensity of each signal point on the received line more uniform. Therefore, in actual situations, the non-uniformity of a word line received at a close distance is much lower than the non-uniformity of a word line projected at infinity (such as the simulation results shown in Figure 9). For example, in the embodiment shown in FIGS. 5 to 9 , in the case of close range reception, the field of view angle θb of the transition region is 5.7°, and the non-uniformity of the middle region is less than 30%.

In the present invention, the calculation method of light intensity non-uniformity is:

(Maximum light intensity - Minimum light intensity)/(Maximum light intensity + Minimum light intensity).

The diffractive optical element 30 may also be configured such that the intensity distribution of the projected light of the one-line projection pattern 65 satisfies a preset intensity distribution curve. In addition to the above uniformly distributed form, for example, the intensity distribution of the projection light of the linear projection pattern 65 can be a normalized intensity distribution of the middle area according to 1/(cosα) ^a , where a is a value ranging from ( 0, 1.5), α is the diffraction angle corresponding to each point on a line.

In this application, preferably, the number of laser light sources 20 in each row of laser light sources 21 is 7 to 25. Preferably, the plurality of laser light sources 20 in each row are equally spaced (or substantially equally spaced). Preferably, the distance D between two adjacent laser light sources 20 in each row is 20 μm to 40 μm. Preferably, the total distribution width L of the plurality of laser light sources 20 in each row is 150 μm to 600 μm. Preferably, the field of view angle θs of the linear projection pattern 60 projected by the laser emitted by the single laser light source 20 is 40° to 130°. Preferably, the diffractive optical element 30 is parallel to the substrate assembly 10 so that the distances between the plurality of laser light sources 20 and the diffractive optical element 30 are equal. Preferably, the air gap G between the laser light source 20 and the diffractive optical element 30 is 2 mm to 5.5 mm. Preferably, the diffractive optical element 30 includes a 2-step, 4-step or 8-step micro-nano structure. Preferably, the laser light source 20 is a vertical cavity surface emitting laser element (VCSEL). Of course, the laser light source 20 may also be, for example, an LED laser light source or an edge-emitting laser (EEL).

As shown in Figure 10, in a specific implementation, the linear laser projector 100 includes one row of laser light sources. The row of laser light sources 21 includes 8 laser light sources 20, and the 8 laser light sources 20 are equally spaced. The total width L is 175 μm (equivalent to a distance d between two adjacent laser light sources 20 of 25 μm). The distance between two adjacent rows of laser light sources is 250 μm. The air gap G between the laser light source 20 and the diffractive optical element 30 is 2.5 mm. The laser wavelength is 940nm. The diffractive optical element 30 is configured such that the parameter M is three. Among them, as shown in Figure 11, the field of view angle θs along the X direction of the linear projection pattern 60 projected by the laser emitted by the single laser light source 20 is 120°, and the field of view angle along the Y direction is 22.5° ( See the dotted frame and the straight-line projection pattern 60 in the middle in Figure 11). As shown in Figure 12, the field of view angle of the three linear projection patterns 65 projected by all eight laser light sources 20 in the X direction is greater than 120°, and the field of view angle in the Y direction is 22.5° (see Figure 12 middle dashed box).

As shown in FIG. 1 , when N is greater than 1, preferably, the plurality of laser light sources 20 are arranged in N rows on the substrate assembly 10 at equal intervals or substantially equal intervals along the direction Y perpendicular to the set linear direction X. For example, the plurality of laser light sources 20 are arranged in N rows at equal intervals h in the Y direction.

The diffractive optical element 30 is configured such that when N is greater than 1, the M linear projection patterns 65 projected by any one of the N rows of laser light sources 21 are phased in the direction Y perpendicular to the set straight line direction X. adjacent. That is, the M one-line linear projection patterns 65 projected by any one of the N rows of laser light sources 21 are the same as the M one-line projection patterns 65 projected by any other one of the N rows of laser light sources 21 . The linear projection pattern 65 has no intersection along the direction Y perpendicular to the set linear direction X. For example, the q-th one-word line projection pattern 65 projected by the p-th row of laser light source 21 is recorded as one-word line pq (p and q are integers, 1≤p≤N, 1≤q≤M), one-word line pq The linear laser projector 100 is configured such that N×M one-word line projection patterns 65 have the following arrangement relationship: M one-word lines pq with the same p value are adjacent along the direction Y perpendicular to the set straight line direction X; The p values of N one-word lines pq with the same q value are arranged in reverse order according to the row number of the laser light source along the direction Y perpendicular to the set straight line direction X.

As shown in FIG. 1 , a linear laser projector 100 includes 4 (N=4) rows of laser light sources 21A (row number 1), 21B (row number 2), 21C (row number 3) and 21D (row number 3). The row number is 4), and each row of laser light sources 21 projects 2 (M=2) one-line projection patterns 65. Among them, the row laser light source 21A projects a one-word line projection pattern 65A1 (one word line 11) and 65A2 (one word line 12), and the row laser light source 21B projects a one-word line projection pattern 65B1 (one word line 21) and 65B2 (one word line 22), the row laser light source 21C projects a one-word line projection pattern 65C1 (one word line 31) and 65C2 (one word line 32), and the row laser light source 21D projects a one-word line projection pattern 65D1 ( One word line 41) and 65D2 (one word line 42). On the projection screen 50, the eight one-word line projection patterns 65 are arranged in the Y direction as follows: one word line 41, one word line 42, one word line 31, one word line 32, one word line 21, one word line Line 22, one word line 11, one word line 12. It can be seen that these eight one-word line projection patterns 65 satisfy: two one-word lines pq with the same p value are adjacent along the Y direction, and the p values of the four one-word lines pq with the same q value are corresponding along the Y direction. The row numbers of the laser light sources 20 are arranged in reverse order.

Preferably, the one-line laser projector 100 is configured such that N×M one-line projection patterns 65 are arranged at equal intervals (or substantially equal intervals) along the Y direction. In order to realize the N×M linear projection patterns 65 being arranged at equal intervals and to achieve the above-mentioned non-staggered arrangement effect, the plurality of laser light sources 20 are arranged in N rows at equal intervals at intervals h in the Y direction, and the diffractive optical elements 30 are parallel to The structural parameters of the substrate assembly 10 and the laser projector 100 satisfy the following formula (1):

Wherein, D is the minimum period of the diffractive optical element 30 along the direction Y perpendicular to the set linear direction The distance along the direction Y perpendicular to the set linear direction X, G is the air gap between the laser light source 20 and the diffractive optical element 30 .

In such an embodiment, the field of view angle θv along the Y direction of two adjacent linear projection patterns 65 projected by the same row of laser light sources 21 is calculated according to the following formula (1-1). The same row of laser light sources The field of view angle θvm along the Y direction of the M straight-line projection patterns 65 projected by 21 is calculated according to the following formula (1-2). The N×M straight-line projection patterns 65 projected by all laser light sources 20 The field of view angle θvn along the Y direction is calculated according to the following formula (1-3).

θv＝2arctan(h/(2MG)) (1-1)

θvm＝θv×(M-1) (1-2)

θvn =θv×(N×M-1) (1-3)

As shown in Figure 13, in a specific implementation, the linear laser projector 100 includes 4 rows of laser light sources, each row of laser light sources 21 includes 8 laser light sources 20, and the 8 laser light sources 20 are equally spaced. The total width L is 175 μm (equivalent to a distance d between two adjacent laser light sources 20 in each row of 25 μm). The distance between two adjacent rows of laser light sources is 250 μm. The air gap G between the laser light source 20 and the diffractive optical element 30 is 2.5 mm. The laser wavelength is 940nm. The diffractive optical element 30 is configured such that the parameter M is 2, and the eight in-line projection patterns 65 are arranged according to the above-mentioned non-staggered rule. Among them, as shown in FIG. 14 , the two straight line projection patterns 60 projected by the laser light emitted by the single laser light source 20 have a field of view angle θs along the X direction of 120°, a field of view angle θv along the Y direction, and θvm is 2.86° (see the dotted box in Figure 13). As shown in Figure 15, the field of view angle of the eight straight line projection patterns 65 projected by all 4 rows of 32 laser light sources 20 in the X direction is greater than 120°, and the field of view angle θvn in the Y direction is 20.05° ( See the dotted box in Figure 15).

It can be understood that the diffractive optical element 30 of the in-line laser projector 100 shown in FIG. 1 has a collimating function. As shown in FIG. 16 , when the diffractive optical element 30 does not have a collimating function, the in-line laser projector 100 further includes a collimating mirror 40 . The collimating mirror 40 is located between the laser light source 20 and the diffractive optical element 30 and is used to collimate the laser beam emitted by the laser light source 20 . In the embodiment shown in FIG. 16 , θb=arctg(L/f), where f is the focal length of the collimating lens 40 . Preferably, the focal length f of the collimating lens 40 is 2 mm to 5.5 mm. When the one-line laser projector 100 includes the collimating mirror 40, if it is to project an N×M one-line projection pattern 65 uniformly distributed along the Y direction without interleaving as shown in FIG. 1, then multiple The laser light sources 20 are arranged in N rows at equal intervals along the direction Y perpendicular to the set linear direction X on the substrate assembly 10. The structural parameters of the laser projector 100 satisfy the following formula (2):

Among them, D is the minimum period of the diffractive optical element 30 along the direction Y perpendicular to the set linear direction X, λ is the wavelength of the laser, and h is the two adjacent rows of the laser light source 20 along the direction Y perpendicular to the set linear direction X. distance, f is the focal length of the collimating lens 40. In such an embodiment, the field of view angle θv along the Y direction of two adjacent linear projection patterns 65 projected by the same row of laser light sources 21 is calculated according to the following formula (2-1). The same row of laser light sources The field of view angle θvm along the Y direction of the M straight-line projection patterns 65 projected by 21 is calculated according to the following formula (2-2). The N×M straight-line projection patterns 65 projected by all laser light sources 20 The field of view angle θvn along the Y direction is calculated according to the following formula (2-3).

θv＝2arctan(h/(2Mf)) (2-1)

θvm＝θv×(M-1) (2-2)

θvn =θv×(N×M-1) (2-3)

FIG. 17 shows a linear laser projector 200 according to the second preferred embodiment of the present application. In the embodiment shown in FIG. 16 , a linear laser projector 200 includes a substrate assembly 10 , a plurality of laser light sources 20 and a diffraction optical element 230 . Wherein, a plurality of laser light sources 20 are disposed on the substrate assembly 10 for emitting laser light. The plurality of laser light sources 20 are arranged in N rows (N is a positive integer, N=4 in the illustrated embodiment) along the direction Y perpendicular to the set linear direction A plurality of laser light sources 20 are arranged. The diffractive optical element 230 is used to diffuse the laser light emitted by the plurality of laser light sources 20 along the set linear direction A one-line projection pattern 65 extending in the fixed straight line direction X, wherein N×M one-line projection patterns 65 are arranged at intervals along the direction Y perpendicular to the set straight line direction X.

What is different from the embodiment shown in FIG. 1 is that in the embodiment shown in FIG. 17 , the N×M linear projection patterns 65 are arranged in a staggered manner relative to the N rows of laser light sources 21 . That is, the diffractive optical element 30 is configured such that, when N is greater than 1, the M straight-line projection patterns 65 projected by at least one of the N rows of laser light sources 21 are consistent with at least one of the N rows of laser light sources 21 . M linear projection patterns 65 projected by another row of laser light sources 21 are staggered along the direction Y perpendicular to the set linear direction X. For example, the q-th one-word line projection pattern 65 projected by the p-th row of laser light source 21 is recorded as one-word line pq (p and q are integers, 1≤p≤N, 1≤q≤M), one-word line pq The linear laser projector 100 is configured such that N×M one-word line projection patterns 65 have the following relationship: N one-word lines pq with the same q value are adjacent along the direction Y perpendicular to the set straight line direction X; q The p values of N one-word lines pq with the same value are arranged in reverse order according to the row numbers of the laser light source 20 along the direction Y perpendicular to the set straight line direction X.

As shown in FIG. 17 , a linear laser projector 200 includes 4 (N=4) rows of laser light sources 21A (row number 1), 21B (row number 2), 21C (row number 3) and 21D (row number 3). The row number is 4), and each row of laser light sources 21 projects 2 (M=2) one-line projection patterns 65. Among them, the row laser light source 21A projects a one-word line projection pattern 65A1 (one word line 11) and 65A2 (one word line 12), and the row laser light source 21B projects a one-word line projection pattern 65B1 (one word line 21) and 65B2 (one word line 22), the row laser light source 21C projects a one-word line projection pattern 65C1 (one word line 31) and 65C2 (one word line 32), and the row laser light source 21D projects a one-word line projection pattern 65D1 ( One word line 41) and 65D2 (one word line 42). On the projection screen 50, the eight one-word line projection patterns 65 are arranged in the Y direction as follows: one word line 41, one word line 31, one word line 21, one word line 11, one word line 42, one word line Line 32, one word line 22, one word line 12. It can be seen that these eight one-word line projection patterns 65 satisfy: four one-word lines pq with the same q value are adjacent along the Y direction, and the p values of the four one-word lines pq with the same q value are corresponding along the Y direction. The row numbers of the laser light sources 20 are arranged in reverse order.

Preferably, the one-line laser projector 200 is configured such that N×M one-line projection patterns 65 are arranged at equal intervals (or substantially equal intervals) along the Y direction. In order to realize the N×M linear projection patterns 65 being arranged at equal intervals and to achieve the staggered arrangement effect mentioned above, the plurality of laser light sources 20 are arranged in N rows at equal intervals at intervals h in the Y direction, and the diffractive optical elements 230 are parallel to The structural parameters of the substrate assembly 10 and the laser projector 100 satisfy the following formula (3):

Among them, D is the minimum period of the diffractive optical element 230 along the direction Y perpendicular to the set straight line direction X, λ is the wavelength of the laser, and h is the direction Y perpendicular to the set straight line direction The distance G is the air gap between the laser light source 20 and the diffractive optical element 230 .

In such an embodiment, the field of view angle θv along the Y direction of two adjacent linear projection patterns 65 projected by the same row of laser light sources 21 is calculated according to the following formula (3-1). The same row of laser light sources The field of view angle θvm along the Y direction of the M straight-line projection patterns 65 projected by 21 is calculated according to the following formula (3-2). The N×M straight-line projection patterns 65 projected by all laser light sources 20 The field of view angle θvn along the Y direction is calculated according to the following formula (3-3).

θv＝2arctan(N·h/(2G)) (3-1)

θvm＝θv×(M-1) (3-2)

θvn =θv×(N×M-1)/N (3-3)

It can be understood that in the embodiment shown in FIG. 17 , the diffractive optical element 230 has a collimating function. When the diffractive optical element 230 does not have a collimating function, similar to the embodiment shown in FIG. 16 , the in-line laser projector 200 further includes a collimating mirror 40 . The collimating mirror 40 is located between the laser light source 20 and the diffractive optical element 230 and is used to collimate the laser beam emitted by the laser light source 20 . In such an embodiment, θb=arctg(L/f), where f is the focal length of collimating lens 40. Preferably, the focal length f of the collimating lens 40 is 2 mm to 5.5 mm. When the one-line laser projector 200 includes the collimating mirror 40, if it is to project the staggered N×M one-line projection pattern 65 uniformly distributed along the Y direction as shown in FIG. 17, then multiple The laser light sources 20 are arranged in N rows at equal intervals along the direction Y perpendicular to the set linear direction X on the substrate assembly 10. The structural parameters of the laser projector 100 satisfy the following formula (4):

Wherein, D is the minimum period of the diffractive optical element 230 along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, and h is the distance between two adjacent rows of the laser light source 20 along the direction Y perpendicular to the set straight line direction X. , f is the focal length of the collimating lens 40.

In such an embodiment, the field of view angle θv along the Y direction of two adjacent linear projection patterns 65 projected by the same row of laser light sources 21 is calculated according to the following formula (4-1). The same row of laser light sources The field of view angle θvm along the Y direction of the M straight-line projection patterns 65 projected by 21 is calculated according to the following formula (4-2). The N×M straight-line projection patterns 65 projected by all laser light sources 20 The field of view angle θvn along the Y direction is calculated according to the following formula (4-3).

θv＝2arctan(N·h/(2f)) (4-1)

θvm＝θv×(M-1) (4-2)

θvn =θv×(N×M-1)/N (4-3)

When N=1, the laser projector 100 projects M one-line projection patterns 65 . The structural parameters of the laser projector 100 satisfy the following formula (5):

Among them, D is the minimum period of the diffractive optical element 30 along the direction Y perpendicular to the set linear direction Set the viewing angle in the straight line direction X in the direction Y. In such an embodiment, the field of view angle θvm along the Y direction of the M straight-line projection patterns 65 projected by the same row of laser light sources 21 is the same as the N×M straight-line projection patterns projected by all the laser light sources 20 . The viewing angle θvn of the pattern 65 along the Y direction is M times θv.

Usually, in specific practice, users often determine the field of view angle θvn, θvm, θv, etc. according to specific needs, and then combine the spacing of the laser light source along the X direction, the spacing h along the Y direction and the focal length f of the collimating lens 40 or air. Determine the appropriate M value and N value for the gap G, and then derive the structural parameters of diffractive optical elements and so on through the above-mentioned field angle calculation formulas related to formulas (1)-(5).

As shown in Figure 18, in a specific implementation, the linear laser projector 200 includes 4 rows of laser light sources. Each row of laser light sources 21 includes 8 laser light sources 20. The 8 laser light sources 20 are equally spaced and distributed. The total width L is 175 μm (equivalent to a distance d between two adjacent laser light sources 20 in each row of 25 μm). The distance between two adjacent rows of laser light sources is 250 μm. The air gap G between the laser light source 20 and the diffractive optical element 30 is 2.5 mm. The laser wavelength is 940nm. The diffractive optical element 30 is configured such that the parameter M is 2, and the eight straight-line projection patterns 65 are arranged in the above-mentioned staggered pattern. Among them, as shown in Figure 19, the two straight line projection patterns 60 projected by the laser light emitted by the single laser light source 20 have a field of view angle θs along the X direction of 120°, a field of view angle θv along the Y direction, and θvm is 22.5° (see the dotted box in Figure 19). As shown in Figure 20, the field of view angle of the eight straight line projection patterns 65 projected by all 4 rows of 32 laser light sources 20 in the X direction is greater than 120°, and the field of view angle θvn in the Y direction is 40° ( See the dotted box in Figure 20).

Compared with the non-interlaced implementation shown in FIG. 1 , the interleaved implementation shown in FIG. 17 can more easily obtain a larger field of view in the Y direction.

In the embodiment shown in FIG. 18 , the light intensity (energy) distribution of the two straight-line projection patterns 60 projected by a single laser light source 20 is as shown in FIGS. 21 and 22 , corresponding to the single laser light source 20 The light intensity (energy) distribution of two straight line projection patterns 65 projected by an entire row of laser light sources 21 is shown in Figures 23 and 24. By comparing Figure 21 with Figure 23, and Figure 22 with Figure 24, it can be seen that when the projection lights of the eight laser light sources 20 are superimposed, the field of view in the X direction of the superimposed linear projection pattern 65 has increased, and the uniformity of light intensity after multi-point superposition has been significantly improved. It can also be seen from Figures 25 to 28 that the field of view of the linear projection pattern 65 in the X direction is increased after superposition, and the light intensity uniformity after multi-point superposition is significantly improved.

A second aspect of the present application provides a camera assembly. In a preferred embodiment, the camera assembly includes the above-mentioned in-line laser projector 100, an image collector, and a processor. The image collector is used to collect the laser image formed by the pattern projected by the linear laser projector 100; the processor is used to process the laser image to obtain the depth image. The camera assembly according to the present application can easily project a word line whose light intensity distribution meets the preset light intensity distribution requirements (such as uniform or uneven) according to application needs, and capture and capture the laser image formed by the word line. deal with.

A third aspect of the present application provides an electronic device. In a preferred embodiment, the electronic device includes a housing and the above-mentioned camera assembly. Wherein, the camera assembly is disposed to the housing and exposed from the housing to obtain depth images. The electronic device is, for example, a mobile phone, a bracelet, a watch, a tablet computer, smart glasses, a smart helmet, a somatosensory gaming device, etc. The electronic device according to the present application can easily project a word line whose light intensity distribution meets the preset light intensity distribution requirements (such as uniform or uneven) according to application needs, and capture and capture the laser image formed by the word line. deal with.

Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this application. The terminology used herein is for the purpose of describing specific implementations only and is not intended to limit the application. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is inapplicable in that other embodiment or otherwise stated.

The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of illustration and illustration, and are not intended to limit the present application to the scope of the described embodiments. In addition, those skilled in the art can understand that the present application is not limited to the above-described embodiments, and more variations and modifications can be made based on the teachings of the present application. These variations and modifications all fall within the scope of protection claimed by the present application. within range.

Claims (17)

1. A straight-line laser projector, characterized in that it includes: base board components; A plurality of laser light sources, the plurality of laser light sources are arranged on the substrate assembly for emitting laser, the plurality of laser light sources are arranged in N rows in a direction perpendicular to the set straight line direction, wherein each row includes a line along the A plurality of the laser light sources arranged in the set linear direction; and Diffractive optical element, used to diffuse the laser light emitted by the plurality of laser light sources along the set straight line direction, so that each row of the laser light sources projects M linear lines extending along the set straight line direction. Projection patterns to form N×M linear projection patterns extending along the set straight line direction, where N is a positive integer greater than 1, M is a positive integer greater than 1, and the N×M Line-by-line projection patterns are arranged at intervals along the direction perpendicular to the set straight line direction, Wherein, the M one-line projection patterns projected by any one of the N rows of laser light sources are adjacent along a direction perpendicular to the set straight line direction. 2. The one-line laser projector according to claim 1, wherein the plurality of laser light sources are arranged in N at substantially equal intervals on the substrate assembly along a direction perpendicular to the set linear direction. OK. 3. The linear laser projector according to claim 1, characterized in that, in each row of the laser light source: The number of laser light sources is 7 to 25, and/or The plurality of laser light sources are distributed at approximately equal intervals. 4. The linear laser projector according to claim 1, characterized in that, in each row of the laser light source: The distance between two adjacent laser light sources is 20 μm to 40 μm, and/or The total distribution width of the plurality of laser light sources is 150 μm to 600 μm. 5. The linear laser projector according to claim 1, wherein the field of view of the linear projection pattern projected by the laser emitted by a single laser light source is along the set straight line direction. The angle is 40° to 130°. 6. The linear laser projector according to claim 1, wherein the diffractive optical element is parallel to the substrate assembly, and the air gap between the laser light source and the diffractive optical element is 2 mm. to 5.5mm. 7. The straight-line laser projector according to claim 1, further comprising a collimating lens, the collimating lens being disposed between the laser light source and the diffractive optical element. 8. The straight-line laser projector according to claim 7, wherein the focal length of the collimator lens is 2 mm to 5.5 mm. 9. The linear laser projector according to claim 1, wherein the laser light source is a vertical cavity surface emitting laser element. 10. The linear laser projector according to claim 1, wherein the diffractive optical element includes a 2-step, 4-step or 8-step micro-nano structure. 11. The one-line laser projector according to claim 1, wherein the diffractive optical element is configured such that the intensity distribution of the projected light of each one-line projection pattern satisfies a preset intensity distribution. curve. 12. The one-line laser projector according to claim 11, wherein each one-line projection pattern includes transition areas at both ends and a middle area between the two transition areas, The one-line laser projector is configured such that the intensity of the projected light in the middle area is distributed according to the normalized intensity of 1/(cosα) ^a , where a is a real number with a value range of (0, 1.5) , α is the diffraction angle of each point on the linear projection pattern. 13. The linear laser projector according to any one of claims 1 to 12, characterized in that, The one-line projection pattern described in the q-th row projected by the laser light source in the p-th row is recorded as a one-word line pq, p and q are integers, 1≤p≤N, 1≤q≤M, The one-line laser projector is configured such that N×M one-line projection patterns have the following relationship: The M word lines pq with the same p value are adjacent along the direction perpendicular to the set straight line direction; The p values of N word lines pq with the same q value are arranged in reverse order according to the row number of the laser light source along the direction perpendicular to the set straight line direction. 14. The linear laser projector according to claim 13, characterized in that, The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate, and the diffractive optical elements are parallel to the substrate assembly, The structural parameters of the laser projector satisfy the following formula: Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, G, is the air gap between the laser light source and the diffractive optical element. 15. The linear laser projector according to claim 13, characterized in that, The plurality of laser light sources are arranged in N rows at equal intervals along the direction perpendicular to the set straight line direction on the substrate. The one-line laser projector also includes a collimating mirror, and the collimating mirror is configured Between the laser light source and the diffractive optical element, The structural parameters of the laser projector satisfy the following formula: Wherein, D is the minimum period of the diffraction optical element along the direction perpendicular to the set straight line direction, λ is the wavelength of the laser, h is the two adjacent rows of the laser light source perpendicular to the set straight line direction. The distance in the straight line direction, f is the focal length of the collimating lens. 16. A camera component, characterized in that it includes: A linear laser projector according to any one of claims 1-15; An image collector, used to collect the laser image formed by the pattern projected by the linear laser projector; and A processor for processing the laser image to obtain a depth image. 17. An electronic device, characterized by comprising: shell; and 16. The camera assembly of claim 16 disposed to and exposed from the housing to obtain depth images.