CN216052557U

CN216052557U - Projection device and camera module

Info

Publication number: CN216052557U
Application number: CN202122197611.8U
Authority: CN
Inventors: 关赛新
Original assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Current assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-03-15
Anticipated expiration: 2031-09-10

Abstract

The utility model discloses a projection device and a camera module, wherein the projection device comprises: a multi-point light source assembly for emitting a multi-point light beam; the collimating lens system is arranged on the light-emitting side of the multipoint light source component and is used for collimating multipoint light beams emitted by the multipoint light source component; the switching assembly is arranged on one side, far away from the multipoint light source assembly, of the collimating lens system and comprises an optical diffusion element and a driving piece, and the driving piece is used for driving the optical diffusion element to be switched between a first position and a second position. According to the projection device provided by the utility model, the manufacturing cost of the panel can be reduced, and the aesthetic property of the panel, the resolution of the opening area and the overall strength of the screen can be improved.

Description

Projection device and camera module

Technical Field

The utility model relates to the field of optical imaging, in particular to a projection device and a camera module.

Background

The 3D identification module in the related art generally comprises three parts, as shown in fig. 1, a flood lighting module a, a receiving imaging module B and a projection point emitting module C, so that a hole needs to be formed in the front cover glass or a special high-transmittance panel pixel arrangement design needs to be performed on the display panel to increase the light transmittance. As shown in fig. 1, since the 3D identification module is composed of three parts, three through holes 11 are required to be designed on the panel, which greatly increases the manufacturing cost of the panel and also affects the aesthetic property, and in addition, the resolution of the hole forming area is low for increasing the transmittance, and the overall strength of the screen is reduced due to excessive hole forming.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Accordingly, an object of the present invention is to provide a projector that can reduce the manufacturing cost of a panel and improve the aesthetic appearance of the panel, the resolution of a perforated area, and the overall strength of a screen.

A projection device according to an embodiment of the present invention includes: a multi-point light source assembly for emitting a multi-point light beam; the collimating lens system is arranged on the light-emitting side of the multipoint light source component and is used for collimating multipoint light beams emitted by the multipoint light source component; the switching assembly is arranged on one side, far away from the multipoint light source assembly, of the collimating lens system and comprises an optical diffusion element and a driving piece, wherein the driving piece is used for driving the optical diffusion element to switch between a first position and a second position, when the optical diffusion element is at the first position, light beams emitted by the multipoint light source assembly are collimated by the collimating lens system and then irradiate onto the optical diffusion element, and the optical diffusion element is used for converting the collimated light beams into a surface light source; when the optical diffusion element is at the second position, the light beams emitted by the multipoint light source component are collimated by the collimating lens system and do not pass through the optical diffusion element to form the multipoint matrix light source.

According to the projection device provided by the embodiment of the utility model, the switching component is arranged, and the optical diffusion element of the switching component moves between the first position and the second position, so that the projection device can project a plurality of point lights which are spaced from each other towards a target object and can project surface lights towards the target object, the requirement can be met, and the 3D identification module only comprises two parts, namely the receiving imaging module and the structured light projection module, when constructed, so that the manufacturing cost of the panel can be reduced, and the attractiveness of the panel, the resolution of an opening area and the overall strength of a screen can be improved.

Optionally, the optical diffusing element comprises: the micro-lens array is arranged on the substrate. That is, the microlens array and the substrate can be separately produced, and thus, the processing difficulty can be reduced, thereby reducing the production cost.

Alternatively, the optical diffusion element includes a glass substrate on which the microlens array is formed, and the thickness of the optical diffusion element can be reduced to some extent, thereby facilitating a miniaturized design.

Optionally, the length and width of the projected pattern of the microlens array on the substrate are both less than or equal to 75 um. The height of the surface projection of the micro lens array on the substrate is less than or equal to 100 um. The processing of the light beam by the microlens array to construct the surface light on the target object may be facilitated.

Optionally, the driving member is a voice coil motor, a direct current motor or an electromagnetic driver, and therefore different motors can be selected according to different requirements.

Optionally, the collimating lens system includes at least one lens, and an aspheric surface is formed on the lens, and the aspheric surface is a rotationally symmetric curved surface. Therefore, the effect that the collimating lens system converts a plurality of non-parallel light beams into a plurality of parallel light beams can be better improved by optimally designing the structure of the lens.

Optionally, the multi-point light source assembly comprises a multi-point VCSEL light source, so that the characteristic of the laser can be well utilized to acquire target object information.

Optionally, the projection device further comprises: a first mounting bracket and a circuit board; the first mounting bracket is provided with a cavity, the multipoint light source assembly is positioned in the cavity, and the multipoint light source assembly is electrically connected with the circuit board; the first mounting bracket is provided with a light outlet, the light outlet is opposite to the multipoint light source assembly, the optical diffusion assembly is mounted at the light outlet, and the collimating lens system is arranged in the cavity and is positioned between the multipoint light source assembly and the optical diffusion assembly. Therefore, the light beams emitted by the multi-point light source assembly 21 are collimated by the collimating lens system 22 and then directly irradiated onto the target object, so as to form a multi-point matrix light source on the target object.

Optionally, the first position and the second position are on the same horizontal plane, the first position is located at the light exit hole, and the second position is located at a side of the light exit hole. The arrangement is such that the optical diffusion element can have no effect on the light beam when in the second position.

The utility model also provides a camera module with the projection device.

The camera module comprises a projection device and a receiving unit, wherein the projection device is used for projecting light rays to a target object, and the receiving unit is used for receiving the light rays reflected from the target object to form an image.

According to the camera module provided by the embodiment of the utility model, the projection device is arranged, so that the point light source can be projected towards the target object and the surface light source can be projected towards the target object through the projection device, the requirements can be met, the manufacturing cost of the panel can be reduced, and the attractiveness of the panel, the resolution of the opening area and the overall strength of the screen can be improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a 3D recognition module in the related art.

Fig. 2 is a schematic structural diagram of a camera module according to an embodiment of the utility model.

Fig. 3 is a schematic diagram of a multi-point matrix light source projected by a projection device according to an embodiment of the utility model.

Fig. 4 is a schematic view of a surface light source projected by a projection device according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a collimator lens system according to an embodiment of the present invention.

Reference numerals:

a camera module 100,

A panel 1, a perforation 11,

The projection device 2, the multipoint light source assembly 21, the collimating lens system 22, the switching assembly 23, the optical diffusing element 231, the first mounting bracket 24, the cavity 241, the light exit hole 242, the first lens L1, the second lens L2, the third lens L3, the receiving unit 3, the second mounting bracket 31, the assembly cavity 311, the light entrance hole 312, the core plate 32, the lens assembly 33, the target object 10, the multipoint matrix light source 101, and the surface light source 102.

The floodlight module A, the receiving imaging module B and the projection point transmitting module C.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A projection device 2 according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

As shown in fig. 2 to 4, the projection apparatus 2 according to the embodiment of the present invention includes a multipoint light source module 21, a collimator lens system 22 and a switching module 23.

Specifically, the multi-point light source assembly 21 is used for emitting multi-point light beams, the collimating lens system 22 is disposed at the light-emitting side of the multi-point light source assembly 21, for collimating the multi-point light beam emitted from the multi-point light source module 21, the switching group 23 is disposed on a side of the collimating lens system 22 away from the multi-point light source module 21, that is, the multi-point light source module 21 can emit the light beam toward the collimating lens system 22, for light beams, if the multi-point light source module 21 is a multi-point VCSEL (Vertical Cavity Surface Emitting Laser), the multi-point light source module 21 may emit an array Laser beam, that is, the multi-point light source module may include a multi-point Laser light source, it can be understood that the laser has better response speed and coherence, so that the information of the target object 10 can be better acquired by using the laser as the beam emission source of the present application.

Further, the collimator lens system 22 may cause the plurality of non-parallel light beams projected onto the collimator lens system 22 by the multipoint light source module 21 to be projected toward the target object 10 in a mutually parallel manner. It is understood that the multi-point light source module 21 as a light Emitting source, or a multi-point VCSEL (Vertical Cavity Surface Emitting Laser) as a light Emitting source, when multiple beams are emitted toward the collimator lens system 22, each beam may be non-parallel to the other, in order to ensure the projection effect of the light beams, the plurality of non-parallel light beams need to be converted into a parallel state by the collimator lens system 22, for example, as shown in fig. 5, the collimator lens system 22 includes a first lens L1, a second lens L2, and a third lens L3, a plurality of non-parallel light beams are emitted from the point positions of the light source on the left side, after passing through the three lenses, the plurality of non-parallel light beams can be changed into a plurality of mutually parallel light beams, here, the plurality of parallel light beams may continue outward in a horizontal manner or may continue outward in a manner not parallel to the horizontal direction. In addition, it should be noted that the collimating lens system 22 is not limited to have three lenses, but may have four lenses and five lenses, and the above is only an exemplary illustration and is not a limitation to the present application.

Further, the 3D identification module in the related art generally comprises three parts, namely, the floodlight module a, the receiving imaging module B and the projection point emitting module C, so that a hole needs to be formed in the front cover glass or a special high-transmittance panel pixel arrangement design needs to be performed on the display panel to increase the light transmittance. As shown in fig. 1, since the 3D identification module is composed of three parts, three through holes 11 are required to be designed on the panel, which greatly increases the manufacturing cost of the panel and also affects the aesthetic property, and in addition, the resolution of the hole forming area is low for increasing the transmittance, and the overall strength of the screen is reduced due to excessive hole forming.

Based on this, in the present application, by providing the switching assembly 23, specifically, as shown in fig. 2, the switching assembly 23 includes an optical diffusion element 231 (a Didfuser) and a driving member (not shown in the figure), the driving member is used for driving the optical diffusion element 231 to switch between the first position and the second position, when the optical diffusion element 231 is in the first position, the light beam emitted by the multipoint light source assembly 21 is collimated by the collimating lens system 22 and then irradiated onto the optical diffusion element 231, and the optical diffusion element 231 is used for diffusing the plurality of light beams emitted by the multipoint light source assembly 21, so as to convert the collimated light beam into the surface light source 102; when the optical diffusing element 231 is at the second position, the light beams emitted by the multi-point light source assembly 21 are collimated by the collimating lens system 22, and then do not pass through the optical diffusing element 231 and are directly irradiated onto the target object 10, so as to form the multi-point matrix light source 101 on the target object 10.

That is, when the light beam emitted by the multipoint light source assembly 21 is required to be projected onto the target object 10 in the form of the surface light source 102, the optical diffusion element 231 may be driven to the first position by the driving member, so that the light beam may be projected onto the optical diffusion element 231 after passing through the collimating lens system 22, and the optical diffusion element 231 may diffuse the light beam to some extent, so that the light projected onto the target object 10 is in the form of the surface light source 102, so that it may be used as an auxiliary infrared illumination light source, which may increase the contrast of the identified object and reduce the false rate; when it is required to cause the light beams emitted from the multipoint light source assembly 21 to be projected on the target object 10 in the form of point light, the optical diffusion element 231 located at the first position may be driven toward the second position by the driving member, and more specifically, the optical diffusion element 231 may be caused to remain at the second position, thus, after the light beam passes through the collimator lens system 22, the light beam collimated by the collimator lens system 22 is directly projected onto the target object 10, so as to project a plurality of point lights spaced apart from each other on the target object 10, which may facilitate 3D detection, and further, the multi-point light source assembly 21 may include a multi-point VCSEL (Vertical Cavity Surface Emitting Laser) light source, thus, the multi-point light source module 21 can emit the array point light beams, and thus, after being collimated by the collimating lens system 22, the multi-point matrix light source 101 can be projected on the target object 10. According to the above, the present application can complete the emission of the multi-point matrix light source 101 and the area light source 102 by one projection device 2, so that only two perforations 11 can be designed when the panel 1 is designed, thereby reducing the number of perforations 11,

thus, according to the projection device 2 of the embodiment of the present invention, by providing the switching component 23 and moving the optical diffusion element 231 of the switching component 23 between the first position and the second position, the projection device 2 can project the multi-point matrix light source 101 toward the target object 10 and project the surface light source 102 toward the target object 10, which not only meets the requirement, but also includes only two parts when constructing the 3D identification module, so that the number of the through holes 11 on the panel 1 can be reduced, the manufacturing cost of the panel 1 can be reduced, and the aesthetics of the panel 1, the resolution of the hole-opening region, and the overall strength of the panel 1 can be improved.

In some embodiments of the present invention, the optical diffusion element 231 includes a microlens array and a substrate, and the microlens array is disposed on the substrate, that is, the microlens array and the substrate can be separately produced, thereby reducing the processing difficulty and the production cost. Further, the microlens array may be bonded to the substrate, or may be fixed to the substrate in other manners, which is not limited herein.

Further, the optical diffusion element 231 may include a glass substrate, such that the microlens array may be directly formed on the glass substrate, and in one example, the surface structure of the microlens array may be directly processed on the glass substrate by a nanoimprint process, such that the thickness of the optical diffusion element 231 may be reduced to some extent, thereby facilitating a miniaturized design. In addition, the microlens array may also be processed on the glass substrate by photolithography, which is not limited herein.

Optionally, both the length and the width of the projected pattern of the microlens array on the substrate are less than or equal to 75um, for example, the projected pattern of the microlens array on the substrate is rectangular, both the length and the width of the projected pattern of the microlens array on the substrate may be less than 75um, and may also be equal to 75um, and in addition, both the length and the width of the projected pattern of the microlens array on the substrate may also be 69um, 68um, 67um, and the like, which is not limited herein, and such a design may be beneficial for the microlens array to convert the light beam into the surface light source 102.

Optionally, the height of the protrusion of the microlens array on the surface of the substrate is less than or equal to 100um, that is, the height of the protrusion of the microlens array on the surface of the substrate may be less than 100um, or equal to 100um, for example, 98um, 97um, 96um, etc., so that the use requirement may be better satisfied.

In addition, it should be noted here that, the plurality of microlenses in the microlens array may be uniformly arranged during layout, or may be arranged in a non-uniform manner in rows and columns, where the layout may be designed according to actual requirements, and is not limited herein.

In some embodiments of the present invention, the driving member may be a Voice Coil Motor (Voice Coil Motor); the motor can also be a direct current motor (DC motor); it may also be an electromagnetic drive, which all may drive the diffractive optical element 231 well, whereby the optical diffusing element 231 may be driven according to different movement requirements.

Alternatively, the collimator lens system 22 includes at least one lens on which an aspherical surface is formed, the aspherical surface being a rotationally symmetric curved surface. Therefore, the effect that the collimating lens system converts a plurality of non-parallel light beams into a plurality of parallel light beams can be better improved by optimally designing the structure of the lens.

In some embodiments of the present invention, the projection device 2 further includes a first mounting bracket 24 and a circuit board, specifically, the first mounting bracket 24 has a cavity 241, the multi-point light source assembly 21 is located in the cavity 241, the multi-point light source assembly 21 is electrically connected to the circuit board, the first mounting bracket 24 has a light exit hole 242, the light exit hole 242 is disposed opposite to the multi-point light source assembly 21, the optical diffusion assembly 21 is installed at the light exit hole 242, and the collimating lens system 22 is disposed in the cavity 241 and located between the multi-point light source assembly 21 and the optical diffusion element 231. Thus, the light beams emitted from the multipoint light source assembly 21 can be projected onto the optical diffusion element 231 after being collimated by the collimating lens system 22, and then converted into the surface light source 102 through the optical diffusion element 231.

Further, the optical diffusion element 231 is switched between a first position and a second position, the first position and the second position are in the same horizontal plane, the first position is located at the light exit hole 242, and the second position is located at the side of the light exit hole 242. In the specific example shown in fig. 2, the optical diffusion element 231 is located at a first position in the cavity 241, the light beam emitted by the multi-point light source assembly 21 can be projected onto the optical diffusion element 231 after being collimated by the collimating lens system 22, and then converted into the surface light source 102 by the optical diffusion element 231, when the optical diffusion element 231 moves from the first position to the second position, the optical diffusion element 231 can move from the cavity 241 to the second position outside the cavity 241, further, the first position and the second position can be on the same horizontal plane, therefore, the optical diffusion element 231 can move from the first position to the second position in a horizontal movement manner, the horizontal movement is not limited to a linear movement in the horizontal plane and a rotation in the horizontal plane, therefore, when the optical diffusion element 231 moves to the second position, the light beam emitted by the multi-point light source assembly 21 is collimated by the collimating lens system 22, is directly irradiated onto the target object 10 without passing through the optical diffusion element 231 to form the multi-point matrix light source 101 on the target object 10. So configured, the optical diffusion element 231 can be made to have no effect on the light beam when in the second position.

The utility model also provides a camera module 100 with the projection device 2.

The camera module 100 according to the embodiment of the utility model includes a projecting device 2 and a receiving unit 3, wherein the projecting device 2 is used for projecting light rays to the target object 10, and the receiving unit 3 is used for receiving the light rays reflected from the target object 10 to form an image.

For example, as shown in fig. 2, the receiving unit 3 and the projecting device 2 are arranged side by side, the receiving unit 3 includes a second mounting bracket 31, and the first mounting bracket 24 and the second mounting bracket 31 may be integrally cast, or may be fixed after being separately cast, or may be arranged at a distance after being separately cast, which is not limited herein. Further, an assembly cavity 311 is formed in the second mounting bracket 31, a light inlet 312 corresponding to the assembly cavity 311 is formed in the second mounting bracket 31, the receiving unit further includes a core plate 32 and a lens assembly 33, the core plate 32 and the lens assembly 33 are both disposed in the assembly cavity 311, and the light beam projected by the projection device 2 can pass through the lens assembly 33 and be projected onto the core plate 32 after being reflected. Therefore, the camera module 100 of the present application has only two holes, that is, the light exit hole 242 and the light entrance hole 312, so that the number of the through holes 11 of the panel 1 can be reduced, the manufacturing cost of the panel 1 can be reduced, and the aesthetic property of the panel 1, the resolution of the hole opening area, and the overall strength of the screen can be improved.

According to the camera module 100 of the embodiment of the utility model, by providing the projection device 2 of the above embodiment, that is, by the projection device 2, the point light source can be projected toward the target object 10, and the surface light source 102 can be projected toward the target object 10, so that not only the requirement can be met, the number of light holes can be reduced, but also the manufacturing cost of the panel can be reduced, and the aesthetic property of the panel, the resolution of the hole opening area, and the overall intensity of the screen can be improved.

Optionally, as shown in fig. 2, the camera module 100 may further include a panel 1, where the panel 1 may be a glass cover plate, the glass cover plate may be covered on an outer side of the light exit hole 242, that is, a side of the light exit hole 242 away from the multipoint light source assembly 21, a through hole 11 corresponding to the light exit hole 242 may be formed on the glass cover plate, and the light beam may better pass through the through hole 11 and be projected onto the target object 10. It should be understood that the panel 1 may also be a panel pixel arrangement design with a special high transmittance for the panel 1 to increase the light transmittance, and of course, other design forms may also be provided, which is not limited herein.

Other configurations and operations of the camera module 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "some embodiments," "optionally," "further," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A projection device, comprising:

a multi-point light source assembly for emitting a multi-point light beam;

the collimating lens system is arranged on the light-emitting side of the multipoint light source component and is used for collimating multipoint light beams emitted by the multipoint light source component;

a switching assembly disposed on a side of the collimating lens system away from the multi-point light source assembly, the switching assembly including an optical diffusing element and a driving member for driving the optical diffusing element to switch between a first position and a second position,

when the optical diffusion element is at a first position, the light beams emitted by the multipoint light source assembly are collimated by the collimating lens system and then irradiated onto the optical diffusion element, and the optical diffusion element is used for converting the collimated light beams into a surface light source;

when the optical diffusion element is at the second position, the light beams emitted by the multipoint light source component are collimated by the collimating lens system and do not pass through the optical diffusion element to form the multipoint matrix light source.

2. The projection device of claim 1, wherein the optical diffuser element comprises: the optical diffusion element comprises a micro lens array and a substrate, wherein the micro lens array is arranged on the substrate, or the optical diffusion element comprises a glass substrate, and the micro lens array is formed on the glass substrate.

3. The projection device of claim 2, wherein the pattern projected on the substrate by the microlens array has a length and width that are both less than or equal to 75 um.

4. The projection device of claim 2, wherein the height of the microlens array raised above the surface of the substrate is less than or equal to 100 um.

5. The projection device of claim 1, wherein the drive member is a voice coil motor, a dc motor, or an electromagnetic drive.

6. The projection device of claim 1, wherein the collimating lens system comprises at least one lens having an aspheric surface formed thereon, the aspheric surface being a rotationally symmetric surface.

7. The projection device of claim 1, wherein the multi-point light source assembly comprises a multi-point VCSEL light source.

8. The projection device of any of claims 1 to 7, further comprising: a first mounting bracket and a circuit board; the first mounting bracket is provided with a cavity, the multipoint light source assembly is positioned in the cavity, and the multipoint light source assembly is electrically connected with the circuit board; the first mounting bracket is provided with a light outlet, the light outlet is opposite to the multipoint light source assembly, the optical diffusion element is mounted at the light outlet, and the collimating lens system is arranged in the cavity and is positioned between the multipoint light source assembly and the optical diffusion element.

9. The projection device of claim 8, wherein the first location and the second location are in a same horizontal plane, and wherein the first location is located at the exit aperture and the second location is located at a side of the exit aperture.

10. The utility model provides a module of making a video recording which characterized in that includes:

a projection device for projecting light rays onto a target object, the projection device as claimed in any one of claims 1 to 9;

and the receiving unit is used for receiving the light reflected from the target object to form an image.