Laser projection module, depth camera and electronics
A technology of laser projection and depth camera, applied in the field of imaging, can solve the problem of not being completely diffracted, endangering the user's eyes, etc., to achieve the effect of improving security
Active Publication Date: 2020-01-10
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology
When the intensity of the zero-order beam is too strong, the zero-order beam cannot be completely diffracted when it is transmitted to the diffractive optical element, resulting in the intensity of the zero-order beam emitted by the diffractive optical element being too strong, which may endanger the user's eyes
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[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0016] In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0017] I...
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The invention discloses a laser projection module. The laser projection module includes a laser emitter, a reflective element, a diffractive optical element, and a photodetector. The photodetector is arranged between the laser emitter and the reflective element, the photodetector is used to receive the laser to output an electrical signal, the electrical signal is used to determine the non-zero-order beam intensity of the laser, and when the non-zero-order beam intensity is less than the preset intensity Reduce the emission power of the laser transmitter. The invention also discloses a depth camera and an electronic device. The laser projection module, depth camera and electronic device in the embodiment of the present invention arrange a photodetector between the laser emitter and the reflective element, and use the photodetector to detect the intensity of the non-zero-order beam when the intensity of the non-zero-order beam is small , it is determined that the energy of the zero-order beam may be too large, and immediately execute the action of reducing the emission power of the laser transmitter to avoid the problem that the energy of the zero-order beam is too large and endanger the user's eyes, and improve the safety of the laser projection module. .
Description
technical field [0001] The invention relates to the field of imaging technology, in particular to a laser projection module, a depth camera and an electronic device. Background technique [0002] When a laser transmitter emits laser light, the laser light will diverge. After the laser diverges, the light beams superimposed and gathered at the center of the light-emitting surface of the laser emitter are zero-order light beams, and the light beams transmitted around the light-emitting surface of the laser emitter are non-zero-order light beams. When the intensity of the zero-order beam is too strong, the zero-order beam cannot be completely diffracted when transmitted to the diffractive optical element, resulting in the intensity of the zero-order beam emitted by the diffractive optical element being too strong, which may endanger users' eyes. Contents of the invention [0003] Embodiments of the present invention provide a laser projection module, a depth camera and an el...
Claims
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IPC IPC(8): G02B27/42G01S17/89
CPCG02B27/4205G01S17/89G01B11/25G01S7/4814G01S7/497H01S5/02469H01S5/0683H04M1/0272G02B27/425H04M1/0264H04N5/2226H01S5/0236H01S5/02255H01S5/02253H04N23/56H04N13/254H04N13/296G02B27/30H04N23/51
Inventor 周奇群
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD