公开(公告)号：US11513363B2

公开(公告)日：2022-11-29

申请号：US16753564

申请日：2017-12-08

Applicant: GOERTEK INC.

Inventor： Lebao Yang

IPC: G02B27/48 ,  G02B27/28

Abstract: A speckle elimination apparatus, a laser light source and a laser projection system, the speckle elimination apparatus comprising a wave plate (100) and a transmission plate (200) respectively arranged on a laser beam light path, the wave plate (100) and the transmission plate (200) having similar refractive indices and closely arranged adjacent sides, the wave plate (100) being arranged so that an incident surface allows a portion of an incident laser beam to pass through, the transmission plate (200) being arranged so that an incident surface allows the remainder of the incident laser beam to pass through, the portion of the incident laser beam being 25%-75% of the incident laser beam. The speckle elimination apparatus eliminates the phenomenon of laser speckle, and prevents stray light from being produced during laser speckle elimination.

公开(公告)号：US11231641B2

公开(公告)日：2022-01-25

申请号：US17051885

申请日：2018-09-27

Applicant: GOERTEK INC.

Inventor： Lebao Yang ,  Xianbin Wang

IPC: G03B21/20

Abstract: The present invention discloses a driving current correction method and apparatus for multiple laser devices, and a laser projector, A specific embodiment of the method includes in projection periods of n-th to (n+m−1)-th pixel points: detecting light intensity information of a combined laser after being combined lasers emitted from in laser devices in a laser source by using a light sensor, and respectively acquiring actual light intensities of combined lasers when the n-th to the (n+m−1)-th pixel points are projected according to an electric signal output by the light sensor, a number of the laser devices in the laser source being m; establishing a system of linear equations with in variables according to a driving current of each laser device and the actual light intensities of the combined lasers when the n-th to the (n+m−1)-th pixel points are projected, and solving a corresponding relation between the driving current of the each laser device and an actual light intensity of the laser emitted from the each laser device; from a projection of a (n+m)-th pixel point: correcting the driving current of the each laser device according to a set light intensity of the each laser device and the corresponding relation between the driving current of the each laser device and the actual light intensity of the laser emitted from the each laser device. The implementation has a high consistency of detecting light intensity information that can be simply performed.

公开(公告)号：US11474367B2

公开(公告)日：2022-10-18

申请号：US16753600

申请日：2017-12-08

Applicant: GOERTEK INC.

Inventor： Lebao Yang

IPC: G02B27/48 ,  G03B21/20 ,  G02B27/28

Abstract: A speckle elimination apparatus, a laser light source and a laser projection system, the speckle elimination apparatus comprising a diaphragm (100) and a ¼ wave plate group sequentially arranged on a laser beam optical path, the ¼ wave plate group comprising a first ¼ wave plate (200) and a second ¼ wave plate (300) having optical axis angles of 75°-105°, adjacent sides of the first ¼ wave plate (200) and the second ¼ wave plate (300) being closely arranged, the first ¼ wave plate (200) being arranged so as to allow a portion of an incident laser beam to pass through, the second ¼ wave plate (300) being arranged so as to allow the remainder of the incident laser beam to pass through, the portion of the incident laser beam being 25%-75% of the incident laser beam. The speckle elimination apparatus eliminates the phenomenon of laser speckle.