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Light-transmitting sheet, laser projection module, depth camera and electronic device

A technology of laser projection and laser transmitter, applied in the direction of using optical devices, measuring devices, optics, etc., can solve problems such as endangering safety, insignificant resistance threshold value, affecting use, etc., to increase use safety, improve detection ability, Accident avoidance effect

Inactive Publication Date: 2021-05-21
TRIPLE WIN TECHSHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the production process (physical vacuum coating) of indium tin oxide thin films, it is difficult to ensure that the resistance of all indium tin oxide thin films formed in different batches or in the same batch is the same, and the resistance of these indium tin oxide thin films is usually within a certain range. Therefore, when the optical diffraction element substrate is cracked, the resistance of the indium tin oxide thin film on different optical diffraction element substrates is different, and the resistance threshold for judging the rupture is fixed, so there will be optical diffraction The resistance after the component substrate is broken is not obvious relative to the resistance threshold, so that the control integrated circuit cannot detect the change, so that the laser source is directly emitted to the surrounding environment, which endangers safety and affects use

Method used

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  • Light-transmitting sheet, laser projection module, depth camera and electronic device
  • Light-transmitting sheet, laser projection module, depth camera and electronic device
  • Light-transmitting sheet, laser projection module, depth camera and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Such as Figure 1A As shown, Embodiment 1 provides a light-transmitting sheet 100 . The transparent sheet 100 includes: a transparent substrate 10 , a protective structure 10 a and an optical diffraction structure 13 . The substrate 10 defines a projected area 11 and a non-projected area 12 disposed around the projected area 11 . The protection structure 10 a is formed on a substrate surface 10 b of the substrate 10 , and the protection structure 10 a includes a metal circuit 10 c located in the non-projection area 12 . The optical diffraction structure 13 is formed on a side of the substrate 10 opposite to the substrate surface 10b. The material of the substrate 10 can be inorganic glass, transparent plastic (organic glass), composite material and polyester.

[0060] see further Figure 1A , the metal circuit 10c in this embodiment further includes a first input terminal 50a and a first output terminal 50b. When the metal line 10c is connected to an external circuit...

Embodiment 2

[0065] refer to image 3 Compared with the light-transmitting sheet 100 described in Embodiment 1, the light-transmitting sheet 100 in this embodiment differs in that the protective structure 10 a further includes a patterned transparent conductive film 17 located in the projection area 11 . The transparent conductive film 17 is formed of a transparent conductive metal oxide, and the metal oxide in this embodiment is indium tin oxide. The transparent conductive film 17 and the metal circuit 10c partly cover the same substrate surface 10b.

[0066] read on image 3 , the transparent conductive film 17 also includes a second input terminal 60a and a second output terminal 60b. When the transparent conductive film 17 is connected to an external circuit through the second input terminal 60a and the second output terminal 60b, a second circuit can be formed. The second circuit and the first circuit are independent of each other.

[0067] refer to Figure 4 , the protective fil...

Embodiment 3

[0073] Please also refer to Figure 5 and Figure 6 , Embodiment 3 provides a laser projection module 200 . The laser projection module 200 includes: a laser emitter 26 , the transparent sheet 100 , and a control integrated circuit 24 . The laser emitter 26 is a vertical cavity surface laser emitter, and the laser emitter 26 is used to emit laser light. The light-transmitting sheet 100 is used to convert the laser light emitted by the laser emitter 26 into a diffracted laser pattern. The control integrated circuit 24 is electrically connected to the metal circuit 10c of the light-transmitting sheet 100, and communicated with the laser emitter 26. The control integrated circuit 24 is used to detect the resistance value of the metal circuit 10c change, and control the laser emitter 26 to turn off when it is detected that the resistance value of the metal line 10c has changed beyond a preset threshold.

[0074] The laser projection module 200 also includes a mirror base 20 . ...

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Abstract

The present invention provides a light-transmitting sheet, comprising: a light-transmitting substrate defining a projection area and a non-projection area arranged around the projection area; a protection structure formed on one surface of the substrate, wherein the protection structure comprises a metal circuit located in the non-projection area; and an optical diffraction structure formed on one side, opposite to the protection structure, of the substrate. The invention also discloses a projection module using the light-transmitting sheet, a depth camera using the projection module, and an electronic device using the depth camera. The light-transmitting sheet disclosed by the invention caters to the current device miniaturization trend, and has a good application market.

Description

technical field [0001] The invention belongs to the technical field of optical sensing and identification, and relates to a light-transmitting sheet, a laser projection module having the light-transmitting sheet, a depth camera and an electronic device. Background technique [0002] For projection devices that use lasers as light sources, the most common safety protection device is to only coat the indium tin oxide film on the surface of the optical diffraction element substrate, and then electrically connect the indium tin oxide film to a control integrated circuit. The control integrated circuit is communicated with the laser source. When the diffractive optical element substrate is broken, the indium tin oxide film coated on it will also be broken. At this time, the control integrated circuit can detect the resistance of the indium tin oxide film. When the changed resistance is greater than the preset resistance threshold, the laser source is controlled to be turned off, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42G01N27/04
CPCG02B27/4205G01N27/041G02B1/14G02B30/40G02B7/008G02B27/4283G01B11/25G02B27/425G01B11/22G02B27/30G01S17/08
Inventor 王承栋
Owner TRIPLE WIN TECHSHENZHEN CO LTD