LASER SPECKLE-REMOVING OPTICAL COMPONENT, LASER SOURCE AND LASER PROJECTION EQUIPMENT

• US 20180136549A1
• Filed: 12/27/2017
• Published: 05/17/2018
• Est. Priority Date: 10/22/2015
• Status: Active Grant

• Current Assignee: Hisense Co., Ltd. (Qingdao Huatong State-Owned Capital Operation Company Limited), Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation Company Limited), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation Company Limited)
• Original Assignee: Hisense Co., Ltd. (Qingdao Huatong State-Owned Capital Operation Company Limited), Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation Company Limited), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation Company Limited)
• Inventors: TIAN, YOULIANG, LIU, XIANRONG, WANG, QIANG
• Granted Patent: US 10,248,012 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 26/008 in the form of devices for effecting sequential colour changes, e.g. colour wheels
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: G02B 27/141 using dichroic mirrors
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time
• CPC Class Codes: H04N 9/3158 for controlling the spectrum
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

This disclosure provides a laser speckle-removing optical component, including a beam-shrinking lens group and a diffusion sheet arranged on a laser emergent optical path, where the beam-shrinking lens group includes a first beam-shrinking lens and a second beam-shrinking lens, and the diffusion sheet is located between the first beam-shrinking lens and the second beam-shrinking lens, and a distance between the diffusion sheet and the first beam-shrinking lens is shorter than a focal length of the first beam-shrinking lens. The arrangement of the diffusion sheet between the first beam-shrinking lens and the second beam-shrinking lens is able to alleviate the accumulation phenomenon of dust particles on the diffusion sheet, therefore, alleviating light attenuation phenomenon, and prolonging the service life of the laser source. This disclosure also provides a double-color laser source, a three-color laser source and a laser projection equipment applying the above laser speckle-removing optical component.

Claims

1. A laser speckle-removing optical component, comprising a beam-shrinking lens group and a diffusion sheet arranged in a laser emergent optical path, wherein the beam-shrinking lens group comprises a first beam-shrinking lens and a second beam-shrinking lens, and the diffusion sheet is positioned between the first beam-shrinking lens and the second beam-shrinking lens, wherein a distance between the diffusion sheet and the first beam-shrinking lens is shorter than a focal length of the first beam-shrinking lens.

2. The speckle-removing optical component according to claim 1, wherein, the diffusion sheet is capable of rotating under control.

3. The speckle-removing optical component according to claim 1, wherein, the diffusion sheet is capable of translating under control.

4. The speckle-removing optical component according to claim 1, wherein, the first beam-shrinking lens is a convex lens.

5. The speckle-removing optical component according to claim 1, wherein, the second beam-shrinking lens is a concave lens.

6. The speckle-removing optical component according to claim 1, wherein, the second beam-shrinking lens is one convex lens or a group of two convex lenses.

7. The speckle-removing optical component according to claim 5, wherein, a focus point of the first beam-shrinking lens and a focus point of the second beam-shrinking lens are coincident at a point on a laser emergent side of the second beam-shrinking lens.

8. The speckle-removing optical component according to claim 1, wherein, a focus point of the first beam-shrinking lens and a focus point of the second beam-shrinking lens are located on a laser emergent side of the second beam-shrinking lens.

17. A three-color laser source, comprising a red laser device, a blue laser device and a green laser device, wherein,

laser respectively emitted by the red laser device, the blue laser device and the green laser device is converged and passes through a laser speckle-removing optical component according to claim 1.

19. A laser projection equipment, comprising a display component, an optical module, a control component and a three-color laser source according to claim 17, wherein, the optical module comprises a first optical component for directing light from the three-color laser source to the display component, and a second optical component for projecting light emergent from the display component to a screen, and the control component is configured to control the display component and the three-color laser source.

9. A double-color laser source, comprises at least a red laser device and a blue laser device, respectively emitting red laser and blue laser, wherein, the double-color laser source is provided with a beam-shrinking lens group and a diffusion sheet on at least one emergent optical path of an emergent optical path of the red laser and an emergent optical path of the blue laser, wherein the beam-shrinking lens group comprises a first beam-shrinking lens and a second beam-shrinking lens, and the diffusion sheet is located between the first beam-shrinking lens and the second beam-shrinking lens, wherein a distance between the diffusion sheet and the first beam-shrinking lens is shorter than a focal length of the first beam-shrinking lens.

10. The double-color laser source according to claim 9, wherein, a fluorescent wheel is further arranged in the rear of the second beam-shrinking lens on the emergent optical path of the blue laser, and the fluorescent wheel is coated with green fluorescence powder, for emitting green fluorescence under excitation by the blue laser.

11. The double-color laser source according to claim 10, wherein, the fluorescent wheel is provided with a non-transparent substrate on an opposite side of a laser incident side, and a light-converging component is further arranged in front of the laser incident side of the fluorescent wheel, for converging the red laser, green fluorescence reflected by the non-transparent substrate of the fluorescent wheel, and blue laser which is transmitted through the fluorescent wheel and returns.

12. The double-color laser source according to claim 11, wherein, the light-converging component is a dichroscope, which is plated with a film capable of transmitting blue and red light while reflecting green light.

13. The double-color laser source according to claim 10, wherein, a dichroic film is arranged on a surface of a laser incident side of the fluorescent wheel, for transmitting blue laser and reflecting green fluorescence, and a light-converging component is further arranged in front of an opposite side of the laser incident side of the fluorescent wheel, for converging the red laser, green fluorescence transmitted through the fluorescent wheel, and blue laser transmitted through the fluorescent wheel.

14. The double-color laser source according to claim 13, wherein, the light-converging component is a dichroscope, which is plated with a film capable of transmitting red light while reflecting blue and green light.

15. The double-color laser source according to claim 9, wherein, the diffusion sheet is capable of rotating under control.

16. The double-color laser source according to claim 9, wherein, the diffusion sheet is capable of translating under control.

18. A laser projection equipment, comprising a display component, an optical module, a control component and a double-color laser source according to claim 9, wherein, the optical module comprises a first optical component for guiding light from the double-color laser source towards the display component, and a second optical component for projecting light emergent from the display component to a screen, and the control component is configured to control the display component and the double-color laser source.