CN210725011U - Optical element, camera module and electronic equipment - Google Patents
Optical element, camera module and electronic equipment Download PDFInfo
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- CN210725011U CN210725011U CN201921862895.4U CN201921862895U CN210725011U CN 210725011 U CN210725011 U CN 210725011U CN 201921862895 U CN201921862895 U CN 201921862895U CN 210725011 U CN210725011 U CN 210725011U
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Abstract
The utility model relates to an optical element, module and electronic equipment make a video recording. The optical element includes: the microstructure device comprises a first microstructure unit, a second microstructure unit and a first connecting layer, wherein the first microstructure unit and the second microstructure unit are arranged between the first microstructure unit and the second microstructure unit so as to connect the first microstructure unit and the second microstructure unit together; the first microstructure unit is used for converting light rays into collimated light, and the second microstructure unit is located on the light emergent side of the first microstructure unit and used for converting the light rays collimated by the first microstructure unit into structured light. In this embodiment, make DOE have the function of the collimating lens group through the setting of first micro-structural unit, so need not to set up the collimating lens group again in the module of making a video recording to can reduce the cost of the module of making a video recording, and do benefit to the miniaturized design of the module of making a video recording. Simultaneously, set up like this and reduced the device figure of making a video recording module transmitting terminal, reduced the equipment degree of difficulty of the module of making a video recording, improve the imaging quality of the module of making a video recording.
Description
Technical Field
The utility model relates to a 3D imaging technology field especially relates to an optical element, module and electronic equipment make a video recording.
Background
A Diffractive Optical Element (DOE) is a main Optical Element of an imaging device such as an image pickup module, and plays a role in shaping light rays of a light source. In practical use, in order to obtain better shaping effect, before light propagates to diffractive optical element, need first collimate to the light that the light source sent, just need set up corresponding collimating mirror group in the module of making a video recording this moment, this is unfavorable for the miniaturized design of the module of making a video recording.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an optical element, a camera module and an electronic device, aiming at the problem that the size of the camera module is too large due to the need of additionally arranging a collimating mirror assembly in the existing camera module.
An optical element, comprising: a first microstructure unit, a second microstructure unit, and a first connection layer disposed between the first microstructure unit and the second microstructure unit to connect the first microstructure unit and the second microstructure unit together; the first microstructure unit is used for converting light rays into collimated light, and the second microstructure unit is located on the light emergent side of the first microstructure unit and used for converting the light rays collimated by the first microstructure unit into structured light.
In this embodiment, make DOE have the function of the collimating lens group through the setting of first micro-structural unit, so need not to set up the collimating lens group again in the module of making a video recording to can reduce the cost of the module of making a video recording, and do benefit to the miniaturized design of the module of making a video recording. Simultaneously, set up like this and reduced the device figure of making a video recording module transmitting terminal, reduced the equipment degree of difficulty of the module of making a video recording, improve the imaging quality of the module of making a video recording.
Further, the refractive index of the first connection layer is greater than the refractive index of the first microstructure unit. Thus, when light is incident into the first connection layer from the first microstructure unit, the refraction angle of the light is smaller than the incidence angle, so that the collimation degree of the light can be higher. Meanwhile, the requirement of the collimation performance of the first microstructure unit can be reduced to a certain extent by the arrangement, so that the design difficulty of the first microstructure unit is reduced. Alternatively, the refractive index of the first connection layer is smaller than the refractive index of the first microstructure unit.
Furthermore, the difference between the refractive index of the first connecting layer and the refractive index of the first protrusion structure is 0.2-0.6, so that the design difficulty of the first microstructure unit is further reduced.
Furthermore, the first microstructure unit comprises a plurality of first protruding structures arranged at intervals, the first protruding structures are used for collimating light, and the first connecting layer fills gaps between the first protruding structures.
Further, the first connecting layer covers the surface of the first protruding structure close to the second microstructure unit, and the flatness of the surface of the first connecting layer, which is used for being connected with the second microstructure unit, is less than 3 um; or the surface of the first connecting layer, which is connected with the second microstructure, is flush with the surface of the first protruding structure, which is close to the second microstructure unit, and the flatness of the surface of the first connecting layer, which is connected with the second microstructure and the surface of the first protruding structure, which is close to the second microstructure unit, is less than 3 um; and/or the first connecting layer is solidified glue solution.
Further, the first microstructure unit includes a first substrate and a plurality of first protruding structures, where the first protruding structures are used to collimate light, and each of the first protruding structures is disposed on the first substrate at intervals and located between the first substrate and the second microstructure; and/or the second microstructure unit comprises a second substrate and a plurality of second protruding structures, wherein the second protruding structures are used for converting light rays into structured light, the second substrate is connected with the first connecting layer, and the second protruding structures are arranged on the surface, far away from the first microstructure unit, of the second substrate. The utility model discloses in, first protruding structure can set up between first basement and second microstructure unit, reduces first protruding structure because of receiving the probability of scraping and bumping etc. and damaging, improves whole optical element's life.
Furthermore, the first microstructure unit is a fresnel microstructure unit, so that the first microstructure unit is more convenient to produce.
Furthermore, the optical element also comprises a substrate, the substrate can enable light to pass through, and the surface of the first microstructure unit, which is far away from the second microstructure unit, is connected with the substrate. The utility model discloses in, the low sodium salt setting of first micro-structure is between base plate and second micro-structure unit, reduces first micro-structure unit because of receiving the probability of scraping and bumping etc. and damaging, improves whole optical element's life.
Further, the optical element further comprises a second connection layer, which is arranged between the substrate and the first microstructure unit and is used for improving the connection strength between the substrate and the first microstructure unit.
A camera module, comprising: a light source; an optical element opposite to the light source for shaping the light emitted from the light source so as to project the shaped light to a target object, wherein the optical element is as described above; and the receiving unit is used for receiving the light reflected from the target object so as to carry out imaging.
An electronic device comprises the camera module.
Drawings
Fig. 1 is a schematic block diagram of a camera module according to the present invention;
fig. 2 is a schematic cross-sectional view of an optical element of a camera module according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of an optical element of a camera module according to another embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, in the present embodiment, the image capturing module 100 includes a light emitting source 10, an optical element 20, and a receiving unit 30. The light emitted from the light source 10 is shaped into structured light by the optical element 20 and then projected to the target object, and the receiving unit 30 is configured to receive the light reflected from the target object for imaging.
As shown in fig. 2, the optical element 20 includes a substrate 1, a first microstructure unit 2, a second microstructure unit 3, and a first connection layer 4. The substrate 1 can allow light to pass through, and the first microstructure unit 2 is arranged on the substrate 1 and is used for collimating the light passing through the substrate 1; the second microstructure unit 3 is disposed on a side of the first microstructure unit 2 away from the substrate 1, and is configured to shape the light collimated by the first microstructure unit 2, so that the light is converted into structured light. The first connection layer 4 is arranged between the first microstructure unit 2 and the second microstructure unit 3 for connecting the first microstructure unit 2 and the second microstructure unit 3.
In the embodiment, the optical element 20 has the function of the collimating lens group by the arrangement of the first microstructure unit 2, so that the photographing module 100 does not need to be provided with the collimating lens group, thereby reducing the cost of the photographing module 100 and facilitating the miniaturization design of the photographing module 100. Simultaneously, set up like this and reduced the device figure of the module 100 transmitting terminal of making a video recording, reduced the equipment degree of difficulty of the module 100 of making a video recording, improved the imaging quality of the module 100 of making a video recording.
In the present embodiment, the substrate 1 may be a transparent plate material such as a glass plate or a resin plate. The first microstructure unit and the second microstructure unit 3 may be formed by molding and curing corresponding optical glues, and both may be made of the same optical glue, such as an adhesive glue, e.g., epoxy resin, polyurethane, etc., although in some embodiments, both may also be made of different optical glues. The first connection layer 4 is formed by curing a glue solution such as a transparent primer, wherein the primer may be polyethyleneimine.
In this embodiment, the first microstructure unit 2 may be a fresnel microstructure unit, that is, the first microstructure unit 2 is equivalent to a simple fresnel lens, so that the first microstructure unit 2 can be more conveniently produced, and the second microstructure unit 3 may be designed to correspond to a microstructure by using a conventional optical element 20.
In the present embodiment, the production process of the optical element 20 is roughly:
step 1, a substrate 1 (e.g., a glass plate) is provided.
And 2, cleaning the substrate 1, wherein the substrate 1 can be cleaned by adopting a plasma cleaning mode and the like.
Step 3, arranging first optical glue on the cleaned substrate 1, and impressing the first optical glue through a first mold; wherein, the first mold is provided with a pattern corresponding to the first microstructure unit 2, and the first microstructure unit 2 can be imprinted on the first optical glue. As shown in fig. 2, the first microstructure unit 2 includes a plurality of first protruding structures 21 arranged at intervals, the first protruding structures 21 can convert light rays entering from one side of the substrate 1 into collimated light, and at this time, the first mold is provided with a concave structure corresponding to the first protruding structures 21.
And 4, curing the first transparent glue, and then demolding to obtain the first microstructure unit 2.
And 5, arranging a primer on the first microstructure unit 2, and curing the primer to obtain a first connecting layer 4.
And 6, arranging second optical glue on the first connecting layer 4, and then stamping the second optical glue by using a second mold, wherein the second mold is provided with a pattern corresponding to the second microstructure unit 3, and the second microstructure unit 3 can be stamped on the second optical glue. As shown in fig. 2, the second microstructure unit 3 includes a plurality of second protruding structures 31 disposed at intervals, the second protruding structures 31 are used for converting light into structured light, and the second mold is provided with a concave structure corresponding to the durer protruding structure.
And 7, curing the second transparent glue, and then demolding to obtain the second microstructure unit 3.
In the above step, when the primer is provided on the first microstructure units 2, the primer fills gaps between the first protrusion structures. At this time, the refractive index of the first connection layer 4 is greater than the refractive index of the first microstructure unit 2, so that when light is incident from the first microstructure unit 2 into the first connection layer 4, the refraction angle of the light is smaller than the incident angle, i.e., the collimation degree of the light can be higher. Meanwhile, the requirement of the collimation performance of the first microstructure unit 2 can be reduced to a certain extent by the arrangement, so that the design difficulty of the first microstructure unit 2 is reduced. In the embodiment, the refractive index of the first connection layer 4 is greater than the refractive index of the first microstructure unit 2, and the difference is between 0.2 and 0.6, so as to further reduce the design difficulty of the first microstructure unit 2. Of course, in some embodiments, the refractive index of the first connection layer 4 may also be smaller than the refractive index of the first microstructure unit 2.
In the above embodiment, the second microstructure unit 3 is formed by curing the second transparent glue coated on the first connection layer 4, so that in the actual production, the gap of the first microstructure unit 2 needs to be filled with the primer to form a plane capable of bearing the second transparent glue.
The primer can be applied to a proper amount so that the primer can completely cover the surface of the first microstructure unit 2 away from the substrate 1 (i.e. the surface of the first protruding structure 21 close to the second microstructure unit 3), i.e. the first microstructure unit 2 and the second microstructure unit 3 are not in direct contact in the actual product. In addition, the primer may be provided on the first microstructure unit 2 and then the primer may be rotated centrifugally or the like (or the primer may be provided on the first microstructure unit 2 by centrifugal spraying) to flatten the surface of the primer away from the first microstructure unit 2, even if the first connection layer 4 is used for flattening the surface connected to the second microstructure unit 3. In this embodiment, the flatness of the surface of the first connection layer 4 contacting the second microstructure unit 3 is less than 3um, so as to improve the preparation effect of the second microstructure unit 3.
In addition, in some embodiments, the surface of the first connection layer 4 away from the substrate 1 (defined as the connection surface) is flush with the surface of the first microstructure unit 2 away from the substrate 1 (defined as the abutment surface), and at this time, the second microstructure unit 3 may be in direct contact with the first microstructure unit 2. Of course, in order to facilitate the manufacture of the second microstructure unit 3, the parallelism of the plane where the connection surface and the abutting surface are located is also less than 3 um.
In this embodiment, the first microstructure unit and the second microstructure unit are disposed on the same side of the substrate, so that the first microstructure unit and the second microstructure unit are sequentially disposed on the top surface of the substrate and the surface of the first microstructure unit element substrate with the bottom surface of the substrate as a reference, thereby improving the alignment accuracy between the first microstructure unit and the second microstructure unit. Meanwhile, the first microstructure unit is arranged between the substrate and the second microstructure unit, so that the probability of damage of the first microstructure unit due to scraping and the like is reduced, and the service life of the whole optical element is prolonged.
In practical production, influenced by factors such as production process, when the first microstructure unit 2 is manufactured by die pressing, a certain amount of transparent glue exists between the die and the substrate 1, and after the transparent glue is cured, a first base 22 (as shown in fig. 2) is formed, that is, the first microstructure unit 2 in an actual product includes the first base 22 in addition to the first protruding structures 21, that is, the first protruding structures 21 are arranged on the first base 22 at intervals, and the first protruding structures 21 are connected together through the first base 22. Similarly, when the second microstructure units 3 are manufactured by die pressing, a certain amount of transparent glue may exist between the mold and the substrate 1, and after the transparent glue is cured, a second base 32 (as shown in fig. 2) may be formed, that is, the second microstructure units 3 in the actual product include the second protruding structures 31 and the second base 32, wherein the second microstructures are disposed on the surface of the second base 32 away from the first protruding structures 21, and the second base 32 connects the second protruding structures 31 together.
As shown in fig. 2, in the present embodiment, the optical element 20 further includes a second connection layer 5. The second connection layer 5 is provided between the substrate 1 and the first microstructure unit 2, and serves to improve the connection strength between the substrate 1 and the first microstructure unit 2.
In this embodiment, the second connection layer 5 is also a transparent primer, which can improve the active energy of the surface of the substrate 1 and enhance the connection strength between the substrate 1 and the first microstructure unit 2. In this embodiment, the thickness of the primer is 100nm to 5 um.
Of course, in some embodiments, the second connection layer 5 may not be provided, i.e. the first microstructure elements 2 may be provided directly on the substrate 1. In addition, in some embodiments, the final optical element 20 may also be provided without the substrate 1, i.e. the substrate 1 is removed by etching or the like after the second microstructure unit 3 is fabricated or after the first microstructure unit 2 is fabricated.
In some embodiments, the optical element 20 may also be arranged in other ways, and the first microstructure unit 2 and the second microstructure unit 3 may also be formed in other ways, for example, by directly etching the first microstructure unit 2 on the substrate 1, then etching the second microstructure unit 3 on the other substrate 1, and then connecting the two substrates 1 together through the first connection layer 4, where the first connection layer 4 may not fill the gap between the first protruding structures 21 of the first microstructure unit 2 (as shown in fig. 3). Of course, in some embodiments, the first connection layer 4 may be omitted, and the two substrates 1 may be connected together by clamping, screw fastening, or the like.
In addition, in some embodiments, the first microstructure unit 2 may also be arranged in other ways to collimate the light. For example, as shown in fig. 3, the first protruding structures 21 of the first microstructure units 2 are the collimating pillars 210 disposed on the first substrate 22, wherein the sidewalls of the collimating pillars 210 are provided with light shielding layers, and the areas of the first substrate 22, which are used for contacting with the collimating pillars 210 and are not in contact with the collimating pillars 210, are also provided with light shielding layers, so that light can only be emitted from the collimating pillars 210 to the second microstructure units 3.
The utility model also provides an electronic equipment, this electronic equipment have used above-mentioned arbitrary embodiment module of making a video recording 100, wherein, this electronic equipment can be terminal products such as cell-phone, panel computer.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical element, comprising:
a first microstructure unit, a second microstructure unit, and a first connection layer disposed between the first microstructure unit and the second microstructure unit to connect the first microstructure unit and the second microstructure unit together;
the first microstructure unit is used for converting light rays into collimated light, and the second microstructure unit is located on the light emergent side of the first microstructure unit and used for converting the light rays collimated by the first microstructure unit into structured light.
2. The optical element according to claim 1, wherein the refractive index of the first connection layer is larger than the refractive index of the first microstructure unit; alternatively, the refractive index of the first connection layer is smaller than the refractive index of the first microstructure unit.
3. The optical element of claim 2, wherein the refractive index of the first connection layer differs from the refractive index of the first microstructure unit by a value in the range of 0.2 to 0.6.
4. The optical element of claim 1, wherein the first microstructure unit comprises a plurality of first raised structures spaced apart from each other, the first raised structures being configured to collimate light, and the first connection layer filling gaps between the first raised structures.
5. The optical element according to claim 4, wherein the first connection layer covers a surface of the first protruding structure close to the second microstructure unit, and the flatness of the surface of the first connection layer for connecting with the second microstructure unit is less than 3 um; or the surface of the first connecting layer, which is connected with the second microstructure, is flush with the surface of the first protruding structure, which is close to the second microstructure unit, and the flatness of the plane of the surface of the first connecting layer, which is connected with the second microstructure and the surface of the first protruding structure, which is close to the second microstructure unit, is less than 3 um; and/or
The first connecting layer is solidified glue solution.
6. The optical element of claim 1, wherein the first microstructure unit comprises a first substrate and a plurality of first raised structures, wherein the first raised structures are configured to collimate light, and each of the first raised structures is spaced apart from the first substrate and located between the first substrate and the second microstructure; and/or
The second microstructure unit comprises a second substrate and a plurality of second protruding structures, wherein the second protruding structures are used for converting light rays into structured light, the second substrate is connected with the first connecting layer, and the second protruding structures are arranged on the surface, far away from the first microstructure unit, of the second substrate; and/or
The first microstructure unit is a Fresnel microstructure unit.
7. An optical element as recited in claim 1, further comprising a substrate through which light can pass, wherein a surface of the first microstructure unit remote from the second microstructure unit is contiguous with the substrate.
8. The optical element of claim 7, further comprising a second connection layer disposed between the substrate and the first microstructure unit for increasing a connection strength between the substrate and the first microstructure unit.
9. The utility model provides a module of making a video recording which characterized in that includes:
a light source;
an optical element opposite to the light source for shaping the light emitted from the light source so as to project the shaped light to a target object, wherein the optical element is as claimed in any one of claims 1 to 8;
and the receiving unit is used for receiving the light reflected from the target object so as to carry out imaging.
10. An electronic apparatus characterized by comprising the camera module according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921862895.4U CN210725011U (en) | 2019-10-31 | 2019-10-31 | Optical element, camera module and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921862895.4U CN210725011U (en) | 2019-10-31 | 2019-10-31 | Optical element, camera module and electronic equipment |
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| Publication Number | Publication Date |
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| CN210725011U true CN210725011U (en) | 2020-06-09 |
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| CN201921862895.4U Expired - Fee Related CN210725011U (en) | 2019-10-31 | 2019-10-31 | Optical element, camera module and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258335A1 (en) * | 2020-06-24 | 2021-12-30 | 欧菲光集团股份有限公司 | Diffractive optical element, tof depth sensor, and optical system and device |
| CN116224607A (en) * | 2023-05-09 | 2023-06-06 | 深圳市安思疆科技有限公司 | Structured light projector and 3D structured light module |
-
2019
- 2019-10-31 CN CN201921862895.4U patent/CN210725011U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258335A1 (en) * | 2020-06-24 | 2021-12-30 | 欧菲光集团股份有限公司 | Diffractive optical element, tof depth sensor, and optical system and device |
| CN116224607A (en) * | 2023-05-09 | 2023-06-06 | 深圳市安思疆科技有限公司 | Structured light projector and 3D structured light module |
| CN116224607B (en) * | 2023-05-09 | 2023-08-11 | 深圳市安思疆科技有限公司 | Structured light projector and 3D structured light module |
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Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi OMS Microelectronics Co.,Ltd. Address before: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee before: OFilm Microelectronics Technology Co.,Ltd. Address after: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: OFilm Microelectronics Technology Co.,Ltd. Address before: 330029 No. 1189 Jingdong Avenue, Nanchang high tech Zone, Jiangxi Patentee before: NANCHANG OFILM BIO-IDENTIFICATION TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20200609 Termination date: 20211031 |