CN218917908U - Multifunctional projection module - Google Patents
Multifunctional projection module Download PDFInfo
- Publication number
- CN218917908U CN218917908U CN202222579330.3U CN202222579330U CN218917908U CN 218917908 U CN218917908 U CN 218917908U CN 202222579330 U CN202222579330 U CN 202222579330U CN 218917908 U CN218917908 U CN 218917908U
- Authority
- CN
- China
- Prior art keywords
- light
- superlens
- spot controller
- light source
- half angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a multifunctional projection module, which comprises: a light source array, a light spot controller array and a projection device; the light source array comprises a plurality of light sources, and the light spot controller array comprises a plurality of light spot controllers; each light source is used for emitting an initial light beam with a first emission half angle to a corresponding light spot controller; each light spot controller is used for emitting an incident initial light beam at a second divergence half angle to obtain a modulated light beam; the second divergence half angle is an adjustable angle; the projection device is used for collimating a plurality of modulated light beams emitted by the light spot controllers and projecting a point cloud or floodlight illumination under the condition of different second divergence half angles. Through the multifunctional projection module provided by the embodiment of the utility model, the light spot controller is enabled to control the size of the second divergence half angle, so that the projected light spot can be switched between point cloud and floodlight; the device has the advantages of simple structure, good robustness, small manufacturing difficulty and low cost.
Description
Technical Field
The utility model relates to the technical field of structured light generation, in particular to a multifunctional projection module.
Background
Structured light technology has been successfully applied to a plurality of fields such as mobile phone face recognition, face brushing payment, intelligent door locks and the like, and depth information of an object is mainly obtained by projecting speckle on the target object; in order to meet the requirement of better application of the structured light technology in a dark environment or a weak light environment, a floodlight lighting element is usually additionally arranged to realize the light supplementing function, for example, by means of a separate infrared light supplementing lamp, the structured light generation and the floodlight lighting are respectively realized, and in order to realize the two functions, a device for generating the structured light and a device for floodlight lighting are respectively required to be installed, which will occupy a larger installation space and increase the production cost.
The existing structured light and floodlight switching equipment adopts two micro-lens arrays with different lens pitches, and the ratio of the pitch of the light sources in the light source array to the lens pitch of the micro-lens arrays is changed by controlling the micro-lens arrays with the movable light source array corresponding to the different lens pitches respectively, so that the aim of combining structured light illumination and floodlight illumination is fulfilled; the mechanical movable equipment has the defects of complex overall structure, poor robustness, high manufacturing difficulty, high cost and the like.
Disclosure of Invention
In order to solve the above problems, an objective of an embodiment of the present utility model is to provide a multifunctional projection module.
The embodiment of the utility model provides a multifunctional projection module, which comprises: a light source array, a light spot controller array and a projection device; the light spot controller array is arranged on the light emitting side of the light source array, and the projection device is arranged on the light emitting side of the light spot controller array; the light source array comprises a plurality of light sources, the light spot controller array comprises a plurality of light spot controllers, and the light sources are in one-to-one correspondence with the light spot controllers; each light source is used for emitting an initial light beam to a corresponding light spot controller, wherein the initial light beam is a light beam with a first emission half angle; and the initial light beams emitted by the light sources are not overlapped on the spot controllers; each light spot controller is used for emitting the incident initial light beam at a second divergence half angle to obtain a modulated light beam; the second divergence half angle is different from the first divergence half angle, and the second divergence half angle is an adjustable angle; the projection device is used for collimating a plurality of modulated light beams emitted by a plurality of light spot controllers and projecting a point cloud or floodlight illumination under the condition of different second divergence half angles.
Optionally, the relationship between the light source and the spot controller satisfies:
2d*tanθ+D＜h；
2d*tanθ＜m；
wherein θ represents the first divergence half angle; d represents the spacing between the light source and the corresponding spot controller; d represents the size of the light source; h represents the size of the spot controller; m represents the spacing between two adjacent light sources.
Optionally, the spot controller includes: an iris or an adjustable superlens.
Optionally, in a case where the spot controller is the iris, an aperture shape of the iris is square.
Optionally, the formula is satisfied between the aperture size of the iris diaphragm and the second divergence half angle:
k＝2d*tanω+D；
wherein k represents the aperture of the iris; ω represents the second divergence half angle; d represents the spacing between the light source and the corresponding spot controller; d represents the size of the light source.
Optionally, in a case where the spot controller is the iris, and the projection device projects a point cloud, the aperture size of the iris satisfies a relationship:
wherein k represents the aperture of the iris; m represents the interval between two adjacent light sources; d represents the spacing between the light source and the corresponding spot controller; d, d 1 Representing a distance between the spot controller and the projection device; d represents the size of the light source.
Optionally, in the case that the spot controller is the iris, and the projection device projects to form floodlight, the aperture size of the iris satisfies the relation:
wherein k represents the aperture of the iris; m represents the interval between two adjacent light sources; d represents the spacing between the light source and the corresponding spot controller; d, d 1 Representing a distance between the spot controller and the projection device; d represents the size of the light source.
Optionally, in the case that the light spot controller is the tunable superlens, a manner of adjusting the tunable superlens includes: optically controlled, electrically controlled or mechanically controlled.
Optionally, the focal length of each of the adjustable superlenses is the same, and the multifunctional projection module satisfies:
f>d；
wherein f represents the focal length of the tunable superlens; d represents the distance between the light source and the corresponding light spot controller; ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the size of the light source.
Optionally, in a case where the spot controller is the tunable superlens and the projection device projects a point cloud, the second divergence half angle satisfies a relationship:
wherein ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the spacing between the light source and the corresponding spot controller; d represents the size of the light source; h represents the size of the tunable superlens; d, d 1 Representing the distance between the spot controller and the projection device.
Optionally, in a case where the spot controller is the tunable superlens and the projection device projects to form a flood illumination, the second divergence half angle satisfies a relationship:
wherein ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the spacing between the light source and the corresponding spot controller; d represents the size of the light source; h represents the size of the tunable superlens; d, d 1 Representing the distance between the spot controller and the projection device.
Optionally, the projection device includes: a projection superlens; the projection superlens is used for collimating a plurality of modulated light beams emitted by the light spot controller array to obtain a plurality of collimated light beams, and projecting the plurality of collimated light beams to form the point cloud or the floodlight.
Optionally, the projection device further comprises: duplicating the superlens; the copying super lens is arranged on the light emitting side of the projection super lens, and is used for copying a plurality of collimated light beams emitted by the projection super lens and projecting to form copied point cloud or floodlight illumination.
Optionally, the projection superlens shares a substrate with the replication superlens.
Optionally, the projection device includes: a compound superlens; the composite superlens is used for collimating and copying the plurality of modulated light beams emitted by the light spot controller array and projecting the light beams to form copied point cloud or floodlight illumination.
Optionally, the light source is a vertical cavity laser.
Optionally, the initial beam of light is infrared light.
In the above-mentioned scheme provided by the embodiment of the utility model, the light spot controller array is utilized to modulate the initial light beam with the first divergence half angle into the modulated light beam with the second divergence half angle, and the light spot projected by the projection device is switched between the point cloud and the floodlight by controlling the size of the second divergence half angle. The multifunctional projection module realizes two projection functions with a simple structure, and has the advantages of good robustness, small manufacturing difficulty and low cost.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multifunctional projection module according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of an optical path when flood illumination is implemented in the multifunctional projection module provided by the embodiment of the utility model;
fig. 3 is a schematic view showing an effect of projecting a point cloud in the multifunctional projection module provided by the embodiment of the utility model;
fig. 4 is a schematic view showing the effect of projecting flood illumination in the multifunctional projection module according to the embodiment of the present utility model;
fig. 5 is a schematic diagram showing a partial enlarged view of a light source array and a spot controller array in the multifunctional projection module according to the embodiment of the present utility model;
FIG. 6 is a schematic diagram showing a partial enlarged view of a light source array and another spot controller array in a multi-functional projection module according to an embodiment of the present utility model;
fig. 7 is a schematic structural diagram of a projection device including a projection superlens in the multifunctional projection module according to the embodiment of the present utility model;
fig. 8 shows a schematic structural diagram of a replication superlens in the multifunctional projection module provided by the embodiment of the utility model;
fig. 9 is a schematic diagram of a projection point cloud after being replicated by a replication superlens in the multifunctional projection module according to the embodiment of the present utility model;
FIG. 10 is a schematic diagram of a multi-functional projection module according to an embodiment of the present utility model, in which the projection flood illumination is replicated by a replication superlens;
FIG. 11 is a schematic diagram showing a structure of a substrate shared by a projection superlens and a replication superlens in a multi-functional projection module according to an embodiment of the present utility model;
fig. 12 is a schematic structural diagram of a projection device including a compound superlens in the multifunctional projection module according to the embodiment of the present utility model.
Icon:
1-light source array, 2-light spot controller array, 3-projection device, 11-light source, 21-light spot controller, 211-iris, 212-tunable superlens, 31-projection superlens, 32-replication superlens.
Detailed Description
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The embodiment of the utility model provides a multifunctional projection module, which is shown in fig. 1 or fig. 2, and comprises: a light source array 1, a light spot controller array 2 and a projection device 3; the light spot controller array 2 is arranged on the light emitting side of the light source array 1, and the projection device 3 is arranged on the light emitting side of the light spot controller array 2; fig. 1 and 2 show the right side of the light source array 1 as its light-emitting side.
As shown in fig. 1 (or fig. 2), the light source array 1 includes a plurality of light sources 11, the spot controller array 2 includes a plurality of spot controllers 21, and the plurality of light sources 11 are in one-to-one correspondence with the plurality of spot controllers 21; each light source 11 is configured to emit an initial light beam, which is a light beam having a first divergence half angle, to the corresponding spot controller 21; and the plurality of initial light beams emitted by the plurality of light sources 11 are not overlapped on the spot controller array 2; each spot controller 21 is configured to eject the incident initial beam of light at a second divergence half angle to obtain a modulated beam of light; the second divergence half angle is different from the first divergence half angle, and the second divergence half angle is an adjustable angle; the projection device 3 is configured to collimate the modulated light beams emitted by the spot controllers 21 and project a point cloud (as shown in fig. 3) or flood illumination (as shown in fig. 4) under a second, different divergence half angle; it should be noted that, the second divergence half angle corresponding to the modulated light beam when the multifunctional projection module forms the point cloud is smaller than the second divergence half angle corresponding to the modulated light beam when the multifunctional projection module forms the floodlight.
In the embodiment of the present utility model, the light source array 1 and the spot controller array 2 are disposed corresponding to each other, and each light source 11 included in the light source array 1 and each spot controller 21 included in the spot controller array 2 can be corresponding to each other, so that each light source 11 can emit an initial light beam to the spot controller 21 corresponding to each other. Optionally, the light source 11 is a vertical cavity laser, wherein the vertical cavity laser is a semiconductor, and the emitted laser (such as an initial beam) is emitted perpendicularly to the top surface of the integrated circuit; alternatively, the initial beam is infrared light, for example, the initial beam emitted by the vertical cavity laser (light source 11) may be a single beam of laser light in the infrared band; in addition, when the vertical cavity laser is adopted as the light source 11, the light emitting direction is vertical to the substrate, so that higher power output can be realized, and the light emitting effect of the light source array 1 used in the embodiment of the utility model is better.
In the embodiment of the present utility model, the initial light beam emitted by the light source 11 is directed to the corresponding spot controller 21 at a first emission half angle (as shown in fig. 5, fig. 5 is a partially enlarged schematic view of the light source array 1 and the spot controller array 2), and θ is shown in fig. 5; the initial beams entering the spot controller array 2 do not overlap each other, such as the initial beam received by the surface of the spot controller 21 located above in fig. 5, which does not overlap the initial beam received by the surface of the spot controller 21 located below in fig. 5, and a certain distance exists between the two initial beams, so that a plurality of initial beams are prevented from being connected to the surface of the spot controller array 2 when being directed to the spot controller array 2, and therefore, the multifunctional projection module is difficult to project and form a point cloud.
Wherein each spot controller 21 is capable of modulating an initial light beam incident at a first divergence half angle, such as modulating the initial light beam into a modulated light beam exiting at a second divergence half angle, denoted as ω in fig. 5, as shown in fig. 5; it should be noted that, the size of the second divergence half angle may be changed according to different practical situations (or under different conditions), that is, the second divergence half angle is not a fixed size angle, and the second divergence half angle is an adjustable size angle (that is, an adjustable angle); for example, the different practical situations described above may include: the multifunctional projection module is made to project a point cloud (the effect diagram of the point cloud may be shown in fig. 3), or the multifunctional projection module is made to project a floodlight (the effect diagram of the floodlight may be shown in fig. 4), according to these two different actual conditions, the spot controller 21 is made to modulate the incident initial beam into a modulated beam capable of meeting the corresponding actual condition, and the modulated beam is emitted, where the modulated beam has a second divergence half angle capable of meeting the corresponding actual condition.
As shown in fig. 1, the projection device 3 is disposed on the light emitting side of the spot controller array 2 (on the right side of the spot controller array 2 in fig. 1), and the projection device 3 can collimate and emit a light beam (such as a modulated light beam with a second divergence half angle) incident therein, and accordingly, form a point cloud or flood illumination in the far field according to the difference of the second divergence half angle. Specifically, when the plurality of modulated light beams are incident on the projection device 3 at a certain second divergence half angle, if the second divergence half angle makes the plurality of modulated light beams not connected to each other (not overlapped or not contacted as shown in fig. 1) on the surface of the projection device 3, the modulated light beams with the second divergence half angle can be projected in the far field to form a point cloud after being collimated and modulated by the projection device 3; when the plurality of modulated light beams enter the projection device 3 at a second divergent half angle with another magnitude, if the second divergent half angle makes the plurality of modulated light beams connect to each other on the surface of the projection device 3 (as shown in fig. 2, or may overlap, the embodiment of the present utility model does not show the drawing corresponding to this case), and form a surface light source, the modulated light beam with the second divergent half angle can be projected in the far field to form a floodlight after being collimated and modulated by the projection device 3.
The multifunctional projection module provided by the embodiment of the utility model utilizes the light spot controller array 2 to modulate the initial light beam with the first divergence half angle into the modulated light beam with the second divergence half angle to be emitted to the projection device 3, and the light spot projected by the projection device 3 is switched between point cloud and floodlight by controlling the size of the second divergence half angle. The multifunctional projection module realizes two projection functions with a simple structure, and has the advantages of good robustness, small manufacturing difficulty and low cost.
Alternatively, as shown in fig. 5, the relationship between the light source 11 and the spot controller 21 satisfies:
2d*tanθ+D＜h； (1)
2d*tanθ＜m； (2)
wherein θ represents a first divergence half angle; d denotes the spacing between the light source 11 and the corresponding spot controller 21; d denotes the size of the light source 11, for example, the side length, width, diameter, or the like of the light source 11, as shown in fig. 5, the size of the light source 11 being high as it is shown in fig. 5; h denotes the size of the spot controller 21, for example, the side length, width, diameter, or the like of the spot controller 21, as shown in fig. 5, the size of the spot controller 21 being high as it is shown in fig. 5; m denotes the spacing between two adjacent light sources 11.
In the embodiment of the present utility model, the specific positional relationship between the light source 11 and the corresponding spot controller 21 and the first emission half angle θ of the initial beam emitted by the light source 11 may satisfy the above relationship (1) and the relationship (2), so that the arrangement may ensure that the multiple initial beams emitted by the multiple light sources 11 (such as the light source array 1) do not overlap when entering the surface of the spot controller array 2, so that the multifunctional projection module is convenient for implementing mutual switching between two functions.
Optionally, the spot controller 21 includes: iris 211 or tunable superlens 212.
Referring to fig. 6, the spot controller 21 shown in fig. 6 is an iris 211, where the iris 211 is a device capable of adjusting the aperture size, or the iris 211 may be represented as a device capable of adjusting the incident light amount of an incident light beam (such as an initial light beam); the embodiment of the utility model can realize the control of the second divergence half angle of the emergent modulated light beam by controlling the aperture size of the iris 211. Optionally, the aperture shape of the iris 211 is square, and selecting the iris 211 with a square aperture can better control the shape of the light spot emitted to the projection device 3; for example, when the modulated light beam emitted from the iris 211 with a square aperture is incident on the projection device 3 in the form of a surface light source (for example, in the form of a connection of a plurality of modulated light beams incident on the projection device 3), the finally collimated light spot is more uniform than the light spot emitted when the aperture of the iris 211 is in other shapes, for example, if the aperture of the iris 211 is circular, in the case where the modulated light beam is incident on the projection device 3 in the form of a surface light source, the finally emitted light spot will generate a void or overlap, resulting in uneven flood illumination.
Alternatively, referring to fig. 5, the spot controller 21 shown in fig. 5 is a tunable superlens 212, and optionally, the tuning manner of the tunable superlens 212 may include: the tunable superlens 212 may be a superlens made of a certain phase-change material, and the external light excitation or the electrical excitation of the tunable superlens 212 can cause the phase-change material to change phase, so as to control the refractive index of the tunable superlens 212 to change, and finally achieve the effect of controlling the second divergence half angle of the outgoing modulated light beam (such as controlling the deflection angle of the outgoing modulated light beam); alternatively, the tunable superlens 212 may be mechanically tuned to change the magnitude of the second divergence half angle that the outgoing beam (e.g., the modulated beam) has. It should be noted that, the control performed by the iris 211 or the superlens 212 according to the embodiment of the present utility model is the prior art, that is, the corresponding control manner is not modified in the embodiment of the present utility model.
In the embodiment of the utility model, the size of the second divergence half angle of the modulated light beam can be changed conveniently and rapidly by adopting the iris 211 or the adjustable superlens 212 as the light spot controller 21.
Alternatively, referring to fig. 6, the formula is satisfied between the aperture size of the iris 211 and the second divergence half angle:
k＝2d*tanω+D； (3)
where k represents the aperture of the iris 211; ω represents a second divergence half angle; d denotes the spacing between the light source 11 and the corresponding spot controller 21 (e.g. iris 211); d denotes the size of the light source 11 (e.g., the side length, width, diameter, etc. of the light source 11, the size of the light source 11 in fig. 6 being the height thereof shown in the drawing).
In the case of selecting the iris 211 as the spot controller 21 according to the embodiment of the present utility model, the size of the aperture k of the iris 211 corresponding to the second divergence half angle ω may be calculated according to the above formula (3), so that the multifunctional projection module may determine, according to the function to be actually implemented (e.g., forming a point cloud or floodlighting), the relationship between the required second divergence half angle ω and the aperture k of the iris 211, so as to implement function switching.
Alternatively, as shown in fig. 6, in the case where the spot controller 21 is an iris 211 and the projection device 3 projects a formed point cloud, the aperture size of the iris 211 satisfies the relation:
where k represents the aperture of the iris 211; m represents the spacing between two adjacent light sources 11; d denotes the light source 11 and corresponding spot controller21 (e.g., iris 211) spacing; d, d 1 Representing the distance between the spot controller 21 (e.g. iris 211) and the projection device 3; d denotes the size of the light source 11. The dimension (e.g., height) h of the tunable superlens 212 minus the distance D between the light source 11 and the corresponding tunable superlens 212 (the spot controller 21) may be equal to the distance m between two adjacent light sources 11, i.e., h-D may be used instead of m in the above formula (4).
Under the condition that the multifunctional projection module needs to project the point cloud, the aperture k of the iris 211 is controlled to meet the above relation (4), so that the second divergence half angle corresponding to the modulated light beam emitted through the iris 211 can meet the condition of realizing the point cloud projection. For example, by controlling the aperture k of the iris 211 by the above relation (4), it is possible to control the second divergence half angle ω so that a plurality of modulated light beams having the second divergence half angle ω are not connected to each other on the surface of the light incident side of the projection device 3 (as shown in fig. 1) when being directed to the projection device 3, and finally collimated to form a point cloud in the far field (as shown in fig. 3).
Alternatively, as shown in fig. 6, in the case where the spot controller 21 is an iris 211 and the projection device 3 projects to form flood illumination, the aperture size of the iris 211 satisfies the relation:
where k represents the aperture of the iris 211; m represents the spacing between two adjacent light sources 11; d denotes the spacing between the light source 11 and the corresponding spot controller 21 (e.g. iris 211); d, d 1 Representing the distance between the spot controller 21 (e.g. iris 211) and the projection device 3; d denotes the size of the light source 11. The dimension (e.g., height) h of the tunable superlens 212 minus the distance D between the light source 11 and the corresponding tunable superlens 212 (the spot controller 21) may be equal to the distance m between two adjacent light sources 11, i.e., h-D may be used instead of m in the above formula (5).
Accordingly, in the case where the multifunctional projection module needs to project to form floodlight, by controlling the aperture k of the iris 211 to satisfy the above relation (5), the second divergence half angle corresponding to the modulated light beam exiting through the iris 211 can be made to satisfy the condition of realizing floodlight. For example, the aperture k of the iris 211 is controlled by the above relation (5), so that a plurality of modulated light beams having the second divergence half angle ω form a surface light source (a plurality of modulated light beams are connected as shown in fig. 2) on the light-incident side surface of the projection device 3 when being directed to the projection device 3, and finally are collimated to form floodlight illumination in the far field (as shown in fig. 4).
Optionally, as shown in fig. 5, the focal length of each adjustable superlens 212 is the same, and the multifunctional projection module satisfies:
f>d；(6)
where f represents the focal length of tunable superlens 212; d represents the spacing of the light source 11 from the corresponding spot controller 21 (e.g., adjustable superlens 212); ω represents a second divergence half angle; θ represents a first divergence half angle; d denotes the size of the light source 11.
In the case of selecting the tunable superlens 212 as the spot controller 21 according to the embodiment of the present utility model, the specific positional relationship between the light source 11 and the corresponding tunable superlens 212 (the spot controller 21), the first divergence half angle θ of the initial light beam emitted from the light source 11, and the second divergence half angle ω of the modulated light beam emitted from the tunable superlens 212 may satisfy the above-mentioned relationship (6) and relationship (7); the relation (6) is to ensure that the light source 11 is located within the focal length of the tunable superlens 212, because if the distance d between the light source 11 and the corresponding tunable superlens 212 (the spot controller 21) is greater than or equal to the focal length f of the tunable superlens 212, the modulated light beam emitted through the tunable superlens 212 will be focused or collimated, such that the emitted modulated light beam cannot have a size that meets the actual requirement, and therefore the distance d between the light source 11 and the corresponding tunable superlens 212 (the spot controller 21) is limited to be smaller than the focal length f of the tunable superlens 212.
In addition, the relation (7) is a formula that represents a relation between the focal length f of the tunable superlens 212 and the second divergence half angle ω, and based on the relation (7), the size of the focal length f of the tunable superlens 212 corresponding to the second divergence half angle ω can be determined, so that the multifunctional projection module can determine the required size of the second divergence half angle ω according to the function (such as forming a point cloud or floodlight) to be actually implemented, and based on the required second divergence half angle ω, the size of the focal length f of the tunable superlens 212 is controlled, so as to obtain the size of a light spot to be projected on the surface of the projection device 3, so as to implement the function switching.
Alternatively, as shown in fig. 5, in the case where the spot controller 21 is the tunable superlens 212 and the projection device 3 projects a point cloud, the second divergence half angle satisfies the relationship:
wherein ω represents a second divergence half angle; θ represents a first divergence half angle; d denotes the spacing between the light source 11 and the corresponding spot controller 21 (e.g. adjustable superlens 212); d represents the size of the light source 11; h represents the size of tunable superlens 212 (the height of tunable superlens 212 as shown in fig. 5); d, d 1 Indicating the distance between the spot controller 21 and the projection device 3.
Under the condition that the multifunctional projection module needs to project the point cloud, the focal length f of the adjustable super lens 212 is controlled to meet the above relation (8), so that the second divergence half angle corresponding to the modulated light beam emitted by the adjustable super lens 212 can meet the condition of realizing the point cloud projection. For example, the focal length f of the tunable superlens 212 is controlled by the above relation (8), so that when the plurality of modulated light beams with the second divergence half angle ω are directed to the projection device 3, the surfaces of the plurality of modulated light beams on the light incident side of the projection device 3 are not connected to each other (as shown in fig. 1), and finally are collimated to form a point cloud in the far field (as shown in fig. 3); wherein the dimension (e.g., height) h of the tunable superlens 212 minus the spacing d between the light source 11 and the corresponding tunable superlens 212 (spot controller 21) may be equal to the spacing m between two adjacent light sources 11.
Alternatively, as shown in fig. 5, in the case where the spot controller 21 is an adjustable superlens 212 and the projection device 3 projects to form flood illumination, the second divergence half angle satisfies the relation:
wherein ω represents a second divergence half angle; θ represents a first divergence half angle; d denotes the spacing between the light source 11 and the corresponding spot controller 21 (e.g. adjustable superlens 212); d represents the size of the light source 11; h represents the size of tunable superlens 212 (the height of tunable superlens 212 as shown in fig. 5); d, d 1 Representing the distance between the spot controller 21, such as the adjustable superlens 212, and the projection device 3.
Correspondingly, under the condition that the multifunctional projection module needs to project to form floodlight, the focal length f of the adjustable super lens 212 is controlled to meet the above relation (9), so that the second divergence half angle corresponding to the modulated light beam emitted by the adjustable super lens 212 can meet the condition of realizing floodlight. For example, the focal length f of the tunable superlens 212 is controlled by the above relation (9), so that when the plurality of modulated light beams with the second divergence half angle ω are directed to the projection device 3, the plurality of modulated light beams form a surface light source on the light incident side of the projection device 3 (the plurality of modulated light beams are connected as shown in fig. 2), and finally collimated to form floodlight illumination in the far field (as shown in fig. 4).
Alternatively, referring to fig. 7, the projection device 3 includes: a projection superlens 31; the projection superlens 31 is used for collimating the modulated light beams emitted by the spot controller array 2 to obtain collimated light beams, and projecting the collimated light beams to form a point cloud or floodlight.
Wherein, the projection superlens 31 is located on the light emergent side of the spot controller array 2, and is shown on the right side of the spot controller array 2 in fig. 7; the multiple modulated light beams emitted by the light spot controller array 2 can be directed to the surface of the projection superlens 31, and collimated and emitted by the projection superlens 31, wherein the multiple light beams formed after being collimated by the projection superlens 31 are collimated light beams, and the multiple collimated light beams can form point cloud or floodlight illumination in a far field.
In the embodiment of the utility model, the projection superlens 31 is adopted to collimate the incident modulated light beam, and compared with the traditional collimating lens or lens group, the projection superlens 31 is lighter and thinner, has a simple structure and is lower in cost.
Optionally, referring to fig. 8, the projection device 3 further includes: a replication superlens 32; the replication superlens 32 is disposed on the light-emitting side of the projection superlens 31, and the replication superlens 32 is configured to replicate the plurality of collimated light beams emitted by the projection superlens 31 and project the replicated point cloud or flood illumination.
In the embodiment of the present utility model, as shown in fig. 8, a replication super lens 32 is disposed on the light emitting side (e.g., right side) of the projection super lens 31, that is, the projection device 3 includes the projection super lens 31 and the replication super lens 32; the projection superlens 31 directs the collimated light beams to the replication superlens 32, and the replication superlens 32 can divide and replicate the collimated light beams, in other words, the replication superlens 32 is equivalent to replicating spots (such as point clouds or floodlights) formed by direct projection of the projection superlens 31 into an array, so as to enlarge the field of view of the point clouds or floodlights formed by the multifunctional projection module in the far field.
For example, the replication superlens 32 may project an image (such as an image of a point cloud) formed by a plurality of collimated light beams incident by the projection superlens 31 in a matrix of m×n, where m and n are positive integers. As shown in fig. 9 or 10, fig. 9 shows a schematic diagram of the projected point cloud after replication by the replication superlens 32; FIG. 10 shows a schematic diagram of projected flood illumination after replication by a replication superlens 32; here, fig. 9 and 10 each correspond to a row case where m=n=3. The embodiment of the utility model adopts the replication superlens 32 to split the collimated light beam, so that the field of view of point cloud or floodlight illumination can be enlarged.
Alternatively, referring to fig. 11, the projection superlens 31 and the replication superlens 32 share a substrate, in other words, the projection superlens 31 and the replication superlens 32 are respectively disposed on two sides of the same substrate close to and far from the spot controller array 2, so that the volume or thickness of the projection device 3 can be further reduced, and the volume or thickness of the multifunctional projection module comprising the projection device can be correspondingly reduced.
Alternatively, as shown in fig. 12, the projection device 3 includes: a compound superlens 33; the compound superlens 33 is used to collimate and replicate the multiple modulated light beams emitted by the spot controller array 2 and project the resulting replicated point cloud or flood illumination.
The compound super lens 33 may be a super lens capable of performing dual functions, for example, the compound super lens 33 has two functions of collimating and reproducing an incident light beam (e.g., a modulated light beam) at the same time. For example, a nanostructure may be provided on one side surface of the compound superlens 33 (e.g., the right side surface of the compound superlens 33 in fig. 12) that is capable of collimating and replicating a modulated light beam that is incident therein, and ultimately projecting to form a replicated expanded point cloud or flood illumination. The composite superlens 33 can reduce the volume or thickness of the projection device 3 to a greater extent, thereby reducing the volume or thickness of the multifunctional projection module comprising the composite superlens 33, and the structure of one superlens is simpler and the cost is lower.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or alternatives within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (17)
1. A multi-functional projection module, comprising: a light source array (1), a light spot controller array (2) and a projection device (3); the light spot controller array (2) is arranged on the light emitting side of the light source array (1), and the projection device (3) is arranged on the light emitting side of the light spot controller array (2);
the light source array (1) comprises a plurality of light sources (11), the light spot controller array (2) comprises a plurality of light spot controllers (21), and the light sources (11) are in one-to-one correspondence with the light spot controllers (21);
each of the light sources (11) is configured to emit an initial light beam to a corresponding spot controller (21), the initial light beam being a light beam having a first emission half angle; and a plurality of said initial light beams emitted by a plurality of said light sources (11) are not overlapped on a plurality of said spot controllers (21);
each light spot controller (21) is used for emitting the incident initial light beam at a second divergence half angle to obtain a modulated light beam; the second divergence half angle is different from the first divergence half angle, and the second divergence half angle is an adjustable angle;
the projection means (3) are arranged to collimate a plurality of the modulated light beams emitted by a plurality of the spot controllers (21) and to project a point cloud or flood illumination at a different second divergence half angle.
2. The multi-function projection module according to claim 1, wherein the relation between the light source (11) and the spot controller (21) satisfies:
2d*tanθ+D＜h；
2d*tanθ＜m；
wherein θ represents the first divergence half angle; d represents the spacing between the light source (11) and the respective spot controller (21); d represents the dimensions of the light source (11); h represents the size of the spot controller (21); m represents the spacing between two adjacent light sources (11).
3. A multi-function projection module according to claim 1, characterized in that the spot controller (21) comprises: an iris (211) or an adjustable superlens (212).
4. A multi-function projection module according to claim 3, wherein in the case where the spot controller (21) is the iris (211), the aperture shape of the iris (211) is square.
5. A multi-function projection module according to claim 3, characterized in that the aperture size of the iris (211) and the second divergence half angle satisfy the formula:
k＝2d*tanω+D；
wherein k represents the aperture of the iris (211); ω represents the second divergence half angle; d represents the spacing between the light source (11) and the respective spot controller (21); d represents the dimensions of the light source (11).
6. A multi-function projection module according to claim 3, wherein, in the case where the spot controller (21) is the iris (211) and the projection device (3) projects a point cloud, the aperture size of the iris (211) satisfies the relation:
wherein k represents the aperture of the iris (211); m represents the spacing between two adjacent light sources (11); d represents the spacing between the light source (11) and the respective spot controller (21); d, d 1 Representing a distance between the spot controller (21) and the projection device (3); d represents the dimensions of the light source (11).
7. A multi-function projection module according to claim 3, wherein, in the case where the spot controller (21) is the iris (211) and the projection device (3) projects to form floodlight, the aperture size of the iris (211) satisfies the relation:
wherein k represents the iris(211) Is a pore size of (2); m represents the spacing between two adjacent light sources (11); d represents the spacing between the light source (11) and the respective spot controller (21); d, d 1 Representing a distance between the spot controller (21) and the projection device (3); d represents the dimensions of the light source (11).
8. A multi-functional projection module according to claim 3, characterized in that, in case the spot controller (21) is the adjustable superlens (212), the manner of adjustment of the adjustable superlens (212) comprises: optically controlled, electrically controlled or mechanically controlled.
9. The multi-function projection module of claim 8, wherein the focal length of each of the adjustable superlenses (212) is the same, and the multi-function projection module satisfies:
f>d；
wherein f represents the focal length of the tunable superlens (212); d represents the spacing of the light source (11) from the respective spot controller (21); ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the dimensions of the light source (11).
10. A multi-function projection module according to claim 3, characterized in that, in case the spot controller (21) is the adjustable superlens (212) and the projection device (3) projects a forming point cloud, the second divergence half angle satisfies the relation:
wherein ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the distance between the light source (11) and the corresponding spot controller (21)Is a pitch of (2); d represents the dimensions of the light source (11); h represents the size of the tunable superlens (212); d, d 1 Represents the distance between the spot controller (21) and the projection device (3).
11. A multi-function projection module according to claim 3, characterized in that the second divergence half-angle satisfies the relation in case the spot controller (21) is the adjustable superlens (212) and the projection device (3) projects to form a floodlight illumination:
wherein ω represents the second divergence half angle; θ represents the first divergence half angle; d represents the spacing between the light source (11) and the respective spot controller (21); d represents the dimensions of the light source (11); h represents the size of the tunable superlens (212); d, d 1 Represents the distance between the spot controller (21) and the projection device (3).
12. A multi-function projection module according to claim 1, characterized in that the projection device (3) comprises: a projection superlens (31);
the projection superlens (31) is used for collimating a plurality of modulated light beams emitted by the light spot controller array (2) to obtain a plurality of collimated light beams, and projecting the plurality of collimated light beams to form the point cloud or the floodlight.
13. The multi-function projection module of claim 12, wherein the projection device (3) further comprises: a replication superlens (32);
the replication superlens (32) is arranged on the light emitting side of the projection superlens (31), and the replication superlens (32) is used for replicating a plurality of collimated light beams emitted by the projection superlens (31) and projecting to form replicated point clouds or floodlight illumination.
14. The multi-function projection module of claim 13, wherein the projection superlens (31) shares a substrate with the replication superlens (32).
15. A multi-function projection module according to claim 1, characterized in that the projection device (3) comprises: a compound superlens (33);
the compound superlens (33) is used for collimating and copying a plurality of modulated light beams emitted by the light spot controller array (2) and projecting the light beams to form copied point clouds or floodlight illumination.
16. A multi-function projection module according to any of claims 1-15, characterized in that the light source (11) is a vertical cavity laser.
17. The multi-function projection module of claim 16, wherein the initial beam of light is infrared light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222579330.3U CN218917908U (en) | 2022-09-28 | 2022-09-28 | Multifunctional projection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222579330.3U CN218917908U (en) | 2022-09-28 | 2022-09-28 | Multifunctional projection module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218917908U true CN218917908U (en) | 2023-04-25 |
Family
ID=86042334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222579330.3U Active CN218917908U (en) | 2022-09-28 | 2022-09-28 | Multifunctional projection module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218917908U (en) |
-
2022
- 2022-09-28 CN CN202222579330.3U patent/CN218917908U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114167592B (en) | Multifunctional lighting module | |
| CN104956179B (en) | Using the structural elements of refraction or reflected light from the optical system of array of source generating structure light field | |
| CN108332082B (en) | Lighting module | |
| CN102652281B (en) | Optical multiplexer and projector | |
| JP4901639B2 (en) | Illumination device and projection display device | |
| CN108337492B (en) | Dynamic projection imaging device | |
| US20120140194A1 (en) | Maskless Exposure Apparatus | |
| US11655957B2 (en) | Microstructures for transforming light having Lambertian distribution into batwing distributions | |
| CN102707552A (en) | Illumination unit, projection display unit, and direct view display unit | |
| CN217639903U (en) | Structured light generator, imaging device and comprehensive screen electronic equipment | |
| WO2023246472A1 (en) | Micro-lens array-based laser projection module | |
| CN208432844U (en) | Projective module group, electrooptical device and electronic equipment | |
| CN216308923U (en) | Point floodlight switching projection module and camera module | |
| CN105676340B (en) | Polarization multiplexing light guide structure of composite parabolic reflection micro-collimating lens and implementation method thereof | |
| CN218917908U (en) | Multifunctional projection module | |
| CN114428437A (en) | 3D projector and electronic equipment that structured light and floodlight illumination closed and put | |
| CN113514959A (en) | Projection module, imaging device and electronic equipment | |
| CN113156743A (en) | Infrared 3D surveys transmitting terminal module and degree of depth camera | |
| CN209895097U (en) | Projector and depth camera | |
| CN217467439U (en) | Multifunctional projection module and imaging device | |
| TWI740280B (en) | Structured light projector | |
| CN115629485B (en) | Speckle projector and structured light camera | |
| CN114265238A (en) | Collimation backlight and bore hole three-dimensional display system based on diffraction element | |
| CN113791397A (en) | Light emission module, depth camera and terminal | |
| CN208222182U (en) | Starry sky projector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |