Projection module, photoelectric device and electronic equipment

Abstract

The invention discloses a projection module, a photoelectric device and electronic equipment. The projection module comprises a light source, a collimating element and a diffractive optical element. The light source emits a laser. The collimating element is used for collimating the laser emitted by the light source. The diffractive optical element comprises an incident plane and an emergent planewhich are opposite to each other, the incident plane is opposite to the collimating element and is provided with a Fresnel microstructure, the Fresnel microstructure is cooperated with the collimatingelement to achieve collimation adjustment of the laser, and the diffractive optical element is used for receiving the laser collimated by the collimating element and expanding the laser to form a laser pattern. By using the projection module, the photoelectric device and the electronic equipment, the Fresnel microstructure is arranged on the incident plane of the diffractive optical element, sameoptical performance can be achieved under a condition that the number of lenses of the collimating element is reduced, miniaturization of the projection module is facilitated, and cost of the collimating element is reduced. And meanwhile, the Fresnel microstructure and the diffractive optical element are an integrated structure so that a laser beam expanding effect and quality can be further improved.

Description

technical field [0001] The present invention relates to the field of photoelectric technology, and more specifically, to a projection module, a photoelectric device and electronic equipment. Background technique [0002] At present, projection modules often use collimation elements to gather the laser light emitted by the light source so that the laser light is projected in parallel. However, the current collimation elements generally have a large number of lenses to achieve the collimation effect, which is not conducive to the miniaturization of the projection module. Contents of the invention [0003] Embodiments of the present invention provide a projection module, an optoelectronic device and electronic equipment. [0004] The projection module according to the embodiment of the present invention includes a light source, a collimating element and a diffractive optical element. The light source is used to emit laser light; the collimation element is used to collimate t...

AI Technical Summary

Problems solved by technology

[0002] At present, projection modules often use collimation elements to gather the laser light emitted by the light source so that the laser beams are projected in parallel. However, the current collimation elements generally have a large number of lenses in order to achieve the collimation effect, which is not conducive to the miniaturization of projection modules.

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