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Diffractive optical element and preparation method

A technology of diffractive optical elements and light sources, applied in optical elements, optics, instruments, etc., can solve problems such as reducing the uniformity of speckle patterns

Active Publication Date: 2017-12-08
SHENZHEN ORBBEC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to improve the calculation accuracy, that is, to ensure uniform spot density distribution, the arrangement of VCSEL array chips and the randomness of sub-spot patterns will reduce the uniformity of the final projected spot pattern

Method used

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  • Diffractive optical element and preparation method

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Embodiment Construction

[0046] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0047] figure 1 It is a schematic diagram of a depth camera based on structured light technology. The depth camera includes a structured light projection module 11 and an acquisition module 12. The structured light projection module is used to project structured light patterns into the spatial projection area A, and the acquisition module is used to acquire structured light images on objects in its acquisition area B , generally the projection area A is not lower than the collection area B, so as to ensure that the objects in the collection area corresponding to the collection module can be covered by the structured light pattern. In addition, the depth camera also includes a processor for receiving the structured light image collected by the collecti...

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Abstract

The present invention discloses a diffractive optical element used for a structural light projection module, and the structural light projection module comprises a light source; a plurality of sub-light sources which are arranged into a two dimensional array and are used for emitting the two dimensional patterned light beams consistent with the two dimensional array; the diffractive optical element used for receiving the two dimensional patterned light beams and generating multiple stages of diffractive light beams, wherein the diffractive optical element is configured to project the plurality of two dimensional patterned light beams which are not overlapped with each other, each two dimensional patterned light beam generates a copy pattern correspondingly, and the plurality of copy patterns which are not overlapped with each other form the density distribution uniform spot patterns. The present invention also discloses a method of using the diffractive optical element to prepare the structural light projection module. According to the present invention, by preparing the diffractive optical element for the structural light projection module, the density distribution uniform combined spot patterns can be projected on the condition of satisfying the irrelevance.

Description

technical field [0001] The invention relates to a diffractive optical element and a method for preparing a structured light projection module by using the diffractive optical element. Background technique [0002] 3D imaging technology is the core of the new generation of human-computer interaction technology. With the rigid demand of mobile terminal equipment for 3D imaging technology, depth cameras will be widely used in mobile terminal equipment, which also makes depth cameras move towards low power consumption. , high performance, and small volume. The structured light projection module is the core device in the depth camera based on structured light technology, and its main components are light source and diffractive optical element (DOE). Diffractive Optical Elements (DOE) have the function of modulating light beams, such as splitting incident light beams to generate outgoing light beams with specific structured patterns. A typical solution is to use a laser emitter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42G02B27/09G03B35/00
CPCG02B27/0944G02B27/4233G02B27/425G02B27/4266G02B27/4272G02B27/4277G03B35/00G02B27/48G02B27/4205
Inventor 许星
Owner SHENZHEN ORBBEC CO LTD
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