CN211698256U - Diffuser, time-of-flight emitter and electronic device - Google Patents

Abstract

The present application relates to a diffuser and a time-of-flight emitter, the diffuser comprising a plurality of microlenses arranged on a reference plane; the reference surface comprises at least two rectangular areas, and the two adjacent rectangular areas are butted through a first common edge. Each rectangular region comprises a plurality of sub-regions which are formed by dividing one or more parallel first dividing lines, each sub-region comprises a plurality of sub-units which are formed by dividing one or more parallel second dividing lines and one or more parallel third dividing lines, the second dividing lines are parallel to the first dividing lines, and the third dividing lines are perpendicular to the second dividing lines; an included angle is arranged between the first dividing line and the first public edge, the included angles of the two adjacent rectangular areas are the same in size, the micro lenses are correspondingly arranged in the subunits, and the subunits butted at the two sides of the first dividing line are arranged in a staggered mode. This application sets up contained angle and microlens dislocation set in the diffuser, has solved the diffraction ghost problem that the light field of projection play appears.

Description

Diffuser, time-of-flight emitter and electronic device

Technical Field

The present application relates to the field of optical lenses, and more particularly, to diffusers, time-of-flight emitters and electronic devices.

Background

A Time-of-Flight (TOF) transmitter mainly includes a Vertical-Cavity Surface-Emitting Laser (VCSEL) and a Diffuser (Diffuser). After laser energy emitted by the vertical cavity surface emitting laser enters the micro-structure of the diffuser, various optical field distributions are projected.

When the micro lens of the diffuser is manufactured, the micro lens can be made into an array which is arranged in order among all units, the light emitting points of the vertical cavity surface emitting laser belong to laser, light rays have the characteristic of phase, the light emitting holes have fixed array distribution, and the fixed array of the vertical cavity surface emitting laser and the array period of the whole arrangement of the micro lens enable the light field projected by the micro lens product to have the stripe phenomenon of diffraction ghost, so that the optical energy distribution with uneven intensity appears on a picture. Since the vcsels are usually arranged regularly, the microlens array needs to be disturbed to be arranged randomly, but the random arrangement is generally achieved by overlapping and pressing the lenses together, so that the optical performance of the microlens array changes accordingly.

How to arrange the micro-lenses of the diffuser to avoid the complex diffraction ghost phenomenon after projection is the research and development direction in the industry.

SUMMERY OF THE UTILITY MODEL

The application provides a diffuser, time of flight transmitter and electronic equipment, through the mode of arranging of the microlens of the unique diffuser of design, effectively solved the fringe phenomenon of the diffraction ghost that the light field that the projection came out appears and the problem that the uneven optical energy of intensity distributes appears on the picture.

In a first aspect, the present application provides a diffuser comprising a plurality of microlenses arranged on a reference plane, the reference plane being a plane; the reference plane comprises at least two rectangular areas, a first common edge is arranged between every two adjacent rectangular areas and is butted through the first common edge, the first common edge refers to one edge at the joint of every two adjacent rectangular areas, and the edge can be regarded as a part of one rectangular area or another rectangular area and is called as the first common edge. Each rectangular region comprises a plurality of sub-regions which are formed by dividing one or more parallel first dividing lines, each sub-region comprises a plurality of sub-units which are formed by dividing one or more parallel second dividing lines and one or more parallel third dividing lines, the second dividing lines are parallel to the first dividing lines, and the third dividing lines are perpendicular to the second dividing lines; an included angle is formed between the first dividing line and the first common edge, the included angles between the first dividing line and the first common edge of two adjacent rectangular areas are the same, and the relative inclination directions of the first dividing line and the first common edge of the two adjacent rectangular areas are opposite (namely the extending directions of the first dividing lines of the two adjacent rectangular areas are crossed); the micro lenses are correspondingly arranged in the subunits, and the subunits butted at two sides of the first dividing line are arranged in a staggered manner.

The utility model designs the mode of arranging of the microlens of unique diffuser, particularly, the subunit dislocation set of the setting of contained angle between first secant and the first public limit and the butt joint of first secant both sides, a plurality of microlens one-to-ones set up in a plurality of dislocation arrangement's subunit, have disordered the rule of original microlens and have arranged, effectively solved the fringe phenomenon of the diffraction ghost that the light field that the projection came out appears and the problem that the uneven optical energy of intensity distributes appears on the picture. In addition, the diffuser of the present application is still formed by a single microlens array, which is advantageous for optimizing the design of the diffuser and adjusting the manufacturing process, specifically, the shape deviation of the whole body can be estimated by measuring the shape of only one microlens, which is advantageous for adjusting the shape.

In a possible implementation manner, the at least two rectangular regions mean that the number of the rectangular regions may be two, four, and the like, and the number of the rectangular regions is not limited and may be set as needed.

In a possible implementation manner, in each rectangular area, the sub-units butted at two sides of the first dividing line comprise a first sub-unit and a second sub-unit, and two butted sides of the first sub-unit and the second sub-unit are partially overlapped to form a step structure. Particularly, every the subunit all includes the second side, first side and the third side that connect gradually, the second side is on a parallel with first secant line, the third side with the second side sets up relatively, every in the rectangular region, the butt joint of first secant line both sides the subunit includes first subunit and second subunit, first subunit the second side with the second subunit the local overlap of third side makes first subunit the first side first subunit local the second side with the second subunit first side forms stair structure jointly, in other words, the second side of the first subunit of butt joint does not have complete coincidence with the third side of second subunit, but local coincidence dislocation set has formed stair structure.

In a possible embodiment, in the direction in which the first dividing line extends, the length of the abutting edge of the first sub-unit and the second sub-unit is L1, the length of the overlapping portion of the two abutting edges of the first sub-unit and the second sub-unit is L2, 0.5L 1 ≦ L2 ≦ 0.9L 1, and the lengths L2 of the overlapping portions of the two abutting edges of the first sub-unit and the second sub-unit in any two adjacent sub-areas are independent of each other. In other words, L1 is the length of the second side, and L2 is the length of the overlapping portion of the second side of the first subunit and the third side of the second subunit. When L2 is greater than 0.9 × L1 (i.e., the misalignment distance between the first and second butted sub-cells is less than or equal to 0.1 × L1), the misalignment distance between the first and second butted sub-cells is too small, i.e., the misalignment distance between the two butted microlenses located in the two sub-cells is too small, which does not play a role in eliminating the diffraction strong and weak spots, and when L2 is less than 0.5 × L1 (i.e., the misalignment distance between the first and second butted sub-cells is greater than or equal to 0.5 × L1), the first and second butted sub-cells are reversely misaligned. The length L2 of the two-side overlapping portions where the first sub-unit and the second sub-unit are butted in any two adjacent sub-areas is independent from each other, which means that the length L2 of the two-side overlapping portions where any two butted first sub-units and second sub-units are butted may be the same or different, specifically, for example, in each rectangular area, the misalignment distance of one pair of butted first sub-units and second sub-units may be 0.1L 1, and the misalignment distance of the other pair of butted first sub-units and second sub-units may be 0.1L 1, 0.2L 1, or 0.3L 1.

In a possible embodiment, the angle between the first dividing line and the first common edge is greater than 1 ° and less than 10 °. When the included angle between the first dividing line and the first public edge is smaller than 1 degree, the deviation of the subunit is too small (namely the deviation of the micro lens correspondingly arranged in the subunit is too small) due to the too small included angle, so that the effect of eliminating diffraction strong and weak light spots is not achieved, and when the included angle between the first dividing line and the first public edge is larger than 10 degrees, the edge area of the light spot projected by the micro lens arranged in the rectangular area can be deformed, so that the light field distribution is influenced.

In a possible embodiment, the number of the sub-units distributed along the third dividing line direction in each sub-area is greater than or equal to two and less than or equal to eight, and two adjacent sub-units share one edge. When the number of the sub-units distributed along the third dividing line direction in each sub-region is greater than eight, physical phenomena such as diffraction and the like occur in a light field projected by the micro-lens in the rectangular region, and speckle is generated.

In a possible embodiment, each of the microlenses includes a top surface and a bottom surface, the top surface is a curved surface, the bottom surface is a flat surface, and the microlenses coincide with the subunits in a projection of the reference surface in a direction perpendicular to the reference surface. The curved surface can be designed into an aspheric surface, and the aspheric surface can modulate the light rays emitted into the micro lens in the rectangular area into a required shape.

In a possible implementation manner, at least two rectangular areas form a rectangular array, and a plurality of microlenses correspondingly arranged in the rectangular array are of an integral structure. The structure of integral type is easily makeed, and is with low costs, is favorable to the light field distribution after the projection moreover.

In a possible implementation, the curvatures of the microlenses corresponding to the sub-units in the rectangular region are the same or the sub-units in the rectangular region correspond to the microlenses with two or more curvatures. In other words, the microlenses corresponding to the sub-units in the rectangular region may have the same curvature, or may have different curvatures, which may be adjusted according to the needs of the product.

In a second aspect, the present application provides a time-of-flight transmitter, wherein the time-of-flight transmitter includes vertical cavity surface emitting laser and any one of the foregoing embodiments the diffuser, the vertical cavity surface emitting laser is located in the rectangular array the microlens the top surface one side, the laser energy that the vertical cavity surface emitting laser sent gets into the diffuser a plurality of in the rectangular array after the microlens, the projection optical field is distributed.

In a third aspect, the present application provides an electronic device comprising the aforementioned time-of-flight transmitter.

Through implementing this application embodiment, solved the array period that the microlens of diffuser was neatly arranged and made the light field that the projection of microlens product appear the stripe phenomenon of diffraction ghost and the uneven optical energy distribution's of intensity problem appears in the picture, modulate the laser that vertical cavity surface emitting laser sent into even light source and diverge.

Drawings

Some drawings to which embodiments of the present application relate will be described below.

FIG. 1 is a schematic diagram illustrating an application environment of a diffuser according to an embodiment of the present application;

FIG. 2 is a schematic diagram of two rectangular areas provided in one embodiment of the present application;

FIG. 3 is a schematic diagram of two rectangular areas provided in another embodiment of the present application;

FIG. 4 is a schematic diagram of two rectangular areas provided in another embodiment of the present application;

FIG. 5 is a schematic diagram of four rectangular areas provided in another embodiment of the present application;

FIG. 6 is a schematic structural diagram of a microlens provided in one embodiment of the present application;

FIG. 7 is a schematic diagram of a microlens array according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a microlens architecture according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a microlens architecture according to another embodiment of the present application;

FIG. 10 is a schematic structural diagram of a microlens array according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a microlens array provided in one embodiment of the present application;

FIG. 12 is a schematic structural diagram of a subunit group misalignment arrangement according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a sub-unit misalignment arrangement provided in another embodiment of the present application;

FIG. 14 is a schematic structural diagram of a sub-unit misalignment arrangement provided in another embodiment of the present application;

FIG. 15 is a schematic perspective view of a microlens array according to an embodiment of the present application;

fig. 16 is a schematic perspective view of another microlens array according to an embodiment of the present application.

Detailed Description

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

The present application provides a diffuser, a time-of-flight emitter and an electronic device, wherein the electronic device (not shown in fig. 1) can be a vehicle-mounted device, a mobile phone module, and the like. As shown in fig. 1, fig. 1 schematically depicts a structure diagram of a diffuser located in a time-of-flight emitter, where the time-of-flight emitter 1 mainly includes a vertical cavity surface emitting laser 2 and a diffuser 3, and laser energy emitted by the vertical cavity surface emitting laser 2 enters a microstructure of the diffuser 3 and then projects various optical field distributions. The plurality of microlenses of the diffuser 3 is used to modulate the laser light emitted from the vcsel 2 into a uniform light source divergence.

As shown in fig. 2 and 6, the diffuser includes a plurality of microlenses arranged on a reference plane (i.e., a plane), the reference plane includes at least two rectangular regions 32, the at least two rectangular regions 32 form a rectangular array 31, a first common edge 33 is provided between two adjacent rectangular regions 32 (i.e., two adjacent rectangular regions 32 share one edge), and the two adjacent rectangular regions 32 are connected by the first common edge 33. Each rectangular area 32 comprises at least two sub-areas 34 divided by one or more parallel first dividing lines 321, each sub-area 34 comprises a plurality of sub-units 35 divided by one or more parallel second dividing lines 322 and one or more parallel third dividing lines 323, the second dividing lines 322 are parallel to the first dividing lines 321, and the third dividing lines 323 are perpendicular to the second dividing lines 322. An included angle a1 is formed between the first dividing line 321 and the first common side 33, the included angles a1 and a2 between the first dividing line 321 and the first common side 33 of two adjacent rectangular regions 32 are the same, and the directions in which the first dividing line 321 and the first common side 33 of two adjacent rectangular regions 32 incline relative to each other are opposite (i.e., the extending directions of the first dividing lines 321 of two adjacent rectangular regions 32 intersect); the micro-lenses 36 are correspondingly disposed in the sub-units 35, and the sub-units 35 butted on both sides of the first dividing line 321 are disposed in a staggered manner to form a step structure 37.

In each rectangular area 32, the sub-unit 35 where two sides of the first dividing line 321 are butted comprises a first sub-unit 35a and a second sub-unit 35b, and two sides where the first sub-unit 35a and the second sub-unit 35b are butted are partially overlapped to form a step structure. Specifically, each subunit 35 includes a second side 352, a first side 351, and a third side 353 connected in sequence, the second side 352 being parallel to the first dividing line 321, and the third side 353 and the second side 352 being oppositely disposed. In each rectangular region 32, the sub-unit 35 abutting on both sides of the first dividing line 321 includes a first sub-unit 35a and a second sub-unit 35b (the first sub-unit 35a and the second sub-unit 35b are used for distinguishing two adjacent and abutting sub-units, so that the first sub-unit 35a and the second sub-unit 35b each include a second side 352, a first side 351 and a third side 353 which are connected in sequence, and the second side 352 of the first sub-unit 35a partially overlaps with the third side 353 of the second sub-unit 35b, so that the first side 351 of the first sub-unit 35a, the second side 352 of the first sub-unit 35a partially and the first side 351 of the second sub-unit 35b form a stepped structure 37 together.

The microlens 36 has a top surface 364 and a bottom surface 365, the top surface 364 is a curved surface, the bottom surface 365 is a flat surface, and the microlens 36 coincides with the subunit 35 in a projection of the reference surface in a direction perpendicular to the reference surface. The top surface 364 can be designed to be aspheric, the aspheric curved surface can modulate the light emitted into the micro-lenses in the rectangular array 31 to a desired shape, and the top surface 364 can also be other curved surface.

In one possible embodiment, the curvature of the microlenses 36 corresponding to the sub-unit 35 in the rectangular region 32 is the same or the sub-unit 35 in the rectangular region 32 corresponds to the microlenses 36 with two or more curvatures. In other words, the microlenses 36 correspondingly disposed in the rectangular region 32 may have the same curvature or different curvatures, and the curvatures of the microlenses 36 correspondingly disposed in the rectangular region 32 may be adjusted according to the product requirements.

In one possible embodiment, the material of the microlens 36 may be optical plastic or optical glass.

This application is through the setting to contained angle A1 between first secant 321 and the first public limit 33 and the setting of ladder structure 37 in the rectangular region 32 to set up a plurality of microlens 36 one-to-ones in a plurality of staggered arrangement's subelement 35, disturbed the rule of original microlens and arranged, effectively solved the stripe phenomenon of the diffraction ghost that the light field that the projection came out appears and the uneven optical energy distribution's of intensity problem appears on the picture. In addition, the plurality of microlenses in the rectangular array 31 of the present application are still formed by arranging the single microlens 36, which is beneficial to optimizing the design of the plurality of microlenses in the rectangular array 31 and adjusting the manufacturing process, specifically, only the shape of one microlens 36 needs to be measured to estimate the overall shape deviation, which is beneficial to adjusting the shape.

In a possible embodiment, two adjacent rectangular areas 32 may be symmetrical with respect to the first common edge 33 (i.e. the two adjacent rectangular areas 32 have the same structure, see fig. 2), and the two adjacent rectangular areas 32 may have different structures, except that the included angle a1 and the included angle a2 have the same size (see fig. 4).

In one possible embodiment, the number of the first dividing lines 321 in each rectangular region 32 may be one (see fig. 3), the number of the first dividing lines 321 in each rectangular region 32 may also be multiple, and the multiple first dividing lines 321 are arranged in parallel (see fig. 2).

In a possible embodiment, the number of the rectangular areas 32 may also be four (see fig. 5), the four rectangular areas 32 may have a symmetrical structure about the first common edge 33, and the number of the rectangular areas 32 may be set according to the requirement, which is not limited in this application.

In one possible embodiment, the included angle a1 between the first dividing line 321 and the first common edge 33 is greater than 1 ° and less than 10 °. When the included angle a1 between the first dividing line 321 and the first common edge 33 is smaller than 1 °, since the included angle is too small, the deviation of the subunit 35 is too small (i.e. the deviation of the microlens 36 correspondingly disposed in the subunit 35 is too small), and the effect of eliminating the diffraction strong and weak light spots is not achieved; when the included angle a1 between the first dividing line 321 and the first common edge 33 is greater than 10 °, the edge area of the light spot projected by the micro lens disposed in the rectangular area 32 may be deformed, which affects the light field distribution.

In a possible embodiment, the number of the sub-units 35 distributed along the third dividing line 323 in each sub-area 34 is two or more and eight or less, and two adjacent sub-units 35 share one side. When the number of the sub-units 35 distributed along the third dividing line 323 in each sub-area 34 is greater than eight, the light field projected by the microlenses in the rectangular area may generate physical phenomena such as diffraction, and generate speckle.

In a possible embodiment, at least two rectangular areas 32 form a rectangular array 31, and a plurality of microlenses correspondingly arranged in the rectangular array 31 are of an integrated structure, so that the integrated structure is easy to manufacture, low in cost and beneficial to the distribution of a projected light field.

The plurality of microlenses are arranged in the plurality of subunits in a one-to-one correspondence manner to form a microlens matrix, and the bottom surface of the microlens matrix (i.e. the bottom surface of the plurality of microlenses are arranged and formed) is adapted to the rectangular area, in other words, in the projection on the reference surface along the direction vertical to the reference surface, the projection of the microlens matrix is the rectangular area. As shown in fig. 7, 8, 9, 10 and 11, the microlens array 38 can be formed by a plurality of microlenses 36 arranged regularly, specifically, the bottom surface of the microlens 36 includes a second bottom side 362, a first bottom side 361 and a third bottom side 363 connected in sequence, at least two microlenses 36 are arranged along the direction in which the first bottom side 361 extends to form the microlens set 39, at least two microlens sets 39 are arranged in a staggered manner in the direction in which the second bottom side 362 extends (i.e. the second bottom side 362 of one microlens set 39 partially overlaps with the third bottom side 363 of an adjacent microlens set 39) and are arranged along the direction in which the first bottom side 361 extends to form the microlens framework 40 arranged irregularly, the plurality of microlens frameworks 40 are arranged in sequence along the direction in which the second bottom side 362 extends to form the microlens group 41, the microlens group 41 is rotated clockwise or counterclockwise, the edge of the cut and rotated microlens group 41 forms a microlens matrix 38 with a rectangular bottom surface, a first common edge is arranged between two adjacent microlens matrices 38 (that is, two adjacent microlens matrices share one edge), two adjacent microlens matrices 38 are arranged along the first common edge and form a microlens array together (in the projection on the reference surface along the direction perpendicular to the reference surface, the projection of the microlens array is a rectangular array), and the microlens array is used for modulating laser to be a uniform light source for divergence.

The microlenses 36 are arranged in the subunits 35 in a one-to-one correspondence, a first bottom side 361 of the microlens 36 coincides with a first side 351 of the subunit 35, a second bottom side 362 of the microlens 36 coincides with a second side 352 of the subunit 35, and a third side 363 of the microlens 36 coincides with a third side 353 of the subunit 35.

In a possible embodiment, each microlens group 39 includes a number of microlenses 36 equal to or less than eight, in other words, a number of subunits distributed along the third dividing line direction in each sub-area is equal to or less than eight. When the number of the microlenses 36 in each microlens set 39 is greater than eight (i.e., when the number of the subunits distributed along the third dividing line in each sub-region is greater than eight), the light field projected through the microlens array may generate physical phenomena such as diffraction, and speckle may be generated.

In a possible embodiment, each microlens structure 40 may include two, three, four, or five microlens sets 39, and the number of the microlens sets is not limited in this application, and the specific number may be set according to the needs of the product.

In one possible embodiment, the angle of rotation of the microlens assembly 41 in the clockwise direction or the counterclockwise direction is an included angle between the first dividing line and the first common edge, in other words, the angle of rotation of the microlens assembly 41 in the clockwise direction or the counterclockwise direction is greater than 1 ° and less than 10 °.

In one possible implementation, the VCSEL is located on the top surface 364 side of the microlenses 36 of the microlens array.

In a possible embodiment, the two microlens arrays 41 have opposite rotation directions when forming two adjacent microlens arrays 38, when laser light enters the microlens arrays 38 rotating clockwise, the projected light spots shift clockwise, when laser light enters the microlens arrays 38 rotating counterclockwise, the projected light spots shift counterclockwise, and the two adjacent microlens arrays 38 have opposite rotation directions and the same rotation angle, so that the projected light spots are prevented from being biased to one side, and the distribution of the projected light spots is more uniform.

As shown in fig. 12, 13, and 14, in the direction in which the first dividing line 321 extends, the length of the abutting edge of the first subunit 35a and the second subunit 35b is L1, the length of the overlapping portion of the two abutting edges of the first subunit 35a and the second subunit 35b is L2, 0.5L 1 ≦ L2 ≦ 0.9L 1, in other words, L1 is the length of the second side 352, and L2 is the length of the overlapping portion of the second side 352 of the first subunit 35a and the third side 353 of the second subunit 35 b. When L2 is greater than 0.9 × L1 (i.e., the misalignment distance between the first and second butted sub-cells 35a and 35b is less than or equal to 0.1 × L1), the misalignment distance between the first and second butted sub-cells 35a and 35b is too small, in other words, the misalignment distance between the two butted microlenses within the sub-cells of the rectangular region is small, which does not function to eliminate the strong and weak diffraction spots, and when L2 is less than 0.5 × L1 (i.e., the misalignment distance between the first and second butted sub-cells 35a and 35b is greater than or equal to 0.5 × L1), the two microlenses corresponding to adjacent butted are reversely misaligned.

In a possible embodiment, the lengths L2 of the two overlapping portions of the first sub-unit 35a and the second sub-unit 35b in any two adjacent sub-areas are independent (i.e. the lengths L2 of the overlapping portions of the second side 352 of the two first sub-units 35a and the third side 353 of the second sub-unit 35b in two adjacent sub-areas may be the same or different), specifically, as shown in fig. 12, the length of the left side L2 is equal to the length of the right side L2 in the rectangular area, in other words, the offset distance of the left side is equal to the offset distance of the right side; as shown in fig. 13, in the rectangular region, the offset distance between two adjacent sub-units aligned and butted along the direction extending along the first side 351 may be 0.1 × L1, and the offset distance between two other adjacent and butted sub-units may be 0.2 × L1 or 0.3 × L1, etc. (i.e., the length of the left side L2 in fig. 13 is not equal to the length of the right side L2, and specifically, the length of the left side L2 is greater than the length of the right side L2).

As shown in fig. 15 and 16, fig. 15 and 16 are schematic perspective views of the microlens matrix 38 at different angles, and it can be clearly seen visually that the bottom surface 365 of the microlens 36 is a plane, the top surface 364 is a curved surface, the bottom surface of the microlens matrix 38 formed by arranging a plurality of microlenses 36 is also a plane, and the top surface of the microlens matrix 38 is an undulating curved surface structure formed by the top surfaces of a plurality of microlenses 36.

The microlens array arranged in a staggered mode disturbs the regular arrangement of the original microlenses, and effectively solves the problems that the fringe phenomenon of diffraction ghost images appears in a projected light field and the optical energy distribution with uneven intensity appears on a picture. Meanwhile, the micro-lens array is formed by arranging single micro-lenses, and optimization of the design of the micro-lens array and adjustment of the manufacturing process are facilitated.

The foregoing is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.

Claims (10)

1. A diffuser comprising a plurality of microlenses arranged on a reference plane;

the reference surface comprises at least two rectangular areas, and a first common edge is arranged between every two adjacent rectangular areas and is butted through the first common edge;

each rectangular region comprises a plurality of sub-regions which are formed by dividing one or more parallel first dividing lines, each sub-region comprises a plurality of sub-units which are formed by dividing one or more parallel second dividing lines and one or more parallel third dividing lines, the second dividing lines are parallel to the first dividing lines, and the third dividing lines are perpendicular to the second dividing lines;

an included angle is formed between the first dividing line and the first public side, the included angles between the first dividing line and the first public side of two adjacent rectangular areas are the same in size, and the relative inclination directions of the first dividing line and the first public side of the two adjacent rectangular areas are opposite;

the micro lenses are correspondingly arranged in the subunits, and the subunits butted at two sides of the first dividing line are arranged in a staggered manner.

2. The diffuser of claim 1, wherein in each of said rectangular areas, said sub-units where both sides of said first dividing line are butted comprise a first sub-unit and a second sub-unit, and two sides where said first sub-unit and said second sub-unit are butted are partially overlapped to form a stepped structure.

3. The diffuser of claim 2 wherein, in the direction in which said first dividing line extends, the length of the abutting edge of said first sub-cell and said second sub-cell is L1, the length of the overlapping portion of the abutting edges of said first sub-cell and said second sub-cell is L2, 0.5L 1 ≦ L2 ≦ 0.9L 1, and the length of the overlapping portion of the abutting edges of said first sub-cell and said second sub-cell in any two adjacent sub-regions is L2 independent.

4. The diffuser of claim 3, wherein said angle between said first dividing line and said first common edge is greater than 1 ° and less than 10 °.

5. The diffuser of claim 2, wherein the number of said sub-cells distributed along the direction of said third dividing line in each of said sub-regions is two or more and eight or less, and two adjacent sub-cells share one side.

6. The diffuser of claim 1, wherein each of said microlenses includes a top surface and a bottom surface, said top surface being curved and said bottom surface being planar, a projection of said microlens onto said reference surface in a direction perpendicular to said reference surface coinciding with said sub-unit.

7. The diffuser of claim 1, wherein at least two of said rectangular regions form a rectangular array, and a plurality of said microlenses correspondingly disposed within said rectangular array are of unitary construction.

8. The diffuser of claim 7, wherein the curvature of the plurality of microlenses corresponding to the sub-unit in the rectangular region is the same or the sub-unit in the rectangular region corresponds to the microlenses of two or more curvatures.

9. A time-of-flight transmitter, comprising a vcsel and the diffuser of any of claims 1-8, the vcsel positioned on the top side of the microlenses in the rectangular array, wherein laser energy from the vcsel enters the plurality of microlenses of the rectangular array of the diffuser before projecting an optical field distribution.

10. An electronic device, characterized in that the electronic device comprises a time-of-flight transmitter according to claim 9.

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