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Diffractive optical element, and structured light projection device

A diffractive optical element and structured light projection technology, applied in optical elements, optics, instruments, etc., can solve the problems of fine diffraction pattern changes, optical performance changes of diffractive optical elements, damage to eyes, etc., to reduce the impact.

Pending Publication Date: 2019-10-29
NINGBO SUNNY OPOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the manufacturing process, a small amount of water vapor will enter the microstructure of the diffractive optical element and the area in the glass substrate, and a small amount of moisture or other contaminants attached to the effective surface of the very fine diffraction pattern will cause fine diffraction The pattern changes and can reduce the efficiency of the diffractive optical element, resulting in a change in the optical performance of the diffractive optical element due to the presence of moisture
At the same time, this change can cause safety issues such as eye injury and / or reduced system performance due to exposure to deflected laser light, as well as eye damage due to light focusing

Method used

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  • Diffractive optical element, and structured light projection device
  • Diffractive optical element, and structured light projection device
  • Diffractive optical element, and structured light projection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] figure 1 A schematic cross-sectional view of an integrated optical module including Embodiment 1 of a diffractive optical element according to the present application is shown.

[0057] Such as figure 1 As shown, the integrated optical module is a structured light projection device 1 . The structured light projection device 1 includes a light source 20 , a collimator lens unit 30 and a diffractive optical unit 40 .

[0058] Light source 20 includes coherent or incoherent solid state light source emitters. figure 1 The light emitted by the light source 20 is schematically shown in solid lines. The light source 20 is mounted on a substrate 50 that provides mechanical and electrical properties. The light source 20 can be, for example, a vertical cavity surface emitting laser (VCSEL) or an edge emitting light source, such as a GaAs laser diode, which emits light parallel to the substrate 50 or perpendicular to the surface of the substrate 50 . In addition, the light so...

Embodiment 2

[0073] Refer to the following figure 2 Embodiment 2 of the diffractive optical element 41 of the present application will be described. For clarity, only a single diffractive optical element 41 is shown in the figures.

[0074] In order to more clearly describe the diffractive optical element 41 according to the present application, figure 2 shows the formation process of Embodiment 2 of the diffractive optical element 41 according to the present application, the process includes the following steps:

[0075] Step 1: Select a wafer 42, in this embodiment, the wafer 42 is made of glass.

[0076] For clarity, the Figure 2 to Figure 8 Only a portion of wafer 42 is shown in FIG. In actual processing, the wafer 42 actually comprises a periodic two-dimensional array of the portions shown.

[0077] The wafer 42 may be in a regular array pattern such as a square with side lengths ranging from 150mm to 200mm or any other suitable size. In addition, the wafer 42 may have a circ...

Embodiment 3

[0098] Refer to the following image 3 Embodiment 3 of the diffractive optical element 41 of the present application will be described. For clarity, only a single diffractive optical element 41 is shown in the figures.

[0099] In order to more clearly describe the diffractive optical element 41 according to the present application, image 3 The formation process of Embodiment 3 of the diffractive optical element 41 according to the present application is shown in .

[0100] The formation process of the diffractive optical element 41 described in Embodiment 3 is similar to the formation process of the diffractive optical element 41 described in Embodiment 1. For the sake of brevity, descriptions of steps similar to Embodiment 1 will be omitted.

[0101] In Embodiment 3, another wafer 71 is used in step 7 to be aligned with the wafer 42 of step 6 . The other wafer 71 is a flat wafer and has not been processed in Step 1 to Step 6 in Embodiment 1.

[0102] In step 9, before ...

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Abstract

The application provides a diffractive optical element comprising a plurality of wafers, spacers and a water removal portion. One or more diffractive optical mechanisms are formed on at least one of the wafers. The spacers are disposed between the plurality of wafers to define a cavity for receiving the one or more diffractive optical mechanisms. The water removal section removes water from the one or more diffractive optical mechanisms. The present application also provides a structured light projection device using the diffractive optical element and an apparatus having the structured lightprojection device.

Description

technical field [0001] The present application relates to a diffractive optical element, in particular, the present application relates to a waterproof diffractive optical element, a structured light projection device configured with the diffractive optical element, a depth camera configured with the structured light projection device, and a depth camera configured with the Camera electronics. Background technique [0002] As is well known in the art, a depth camera can acquire depth information of a photographed target, thereby enabling functions such as 3D scanning, imaging, and modeling. The depth camera technology is becoming more and more perfect, and has gradually attracted the attention of various industries. It has begun to appear on a large number of electronic devices, bringing people a better shooting experience. [0003] As an important component of the depth camera, the function of the structured light projection device directly affects the function of the enti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42
CPCG02B27/4205
Inventor 陈飞帆陈振宇潘民杰
Owner NINGBO SUNNY OPOTECH CO LTD