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A dichroic mirror and projection device with laser beam combining function

A projection device and laser beam combining technology, applied in projection devices, optics, optical components, etc., to achieve the effects of volume reduction, reduced angle drift, and high reflectivity

Active Publication Date: 2017-05-31
HANGZHOU KOTI OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems of existing optical modules used in projection devices, the present invention provides a dichroic mirror with laser beam combining function and a projection device, which can simplify the structure of optical modules used in projection devices

Method used

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  • A dichroic mirror and projection device with laser beam combining function
  • A dichroic mirror and projection device with laser beam combining function
  • A dichroic mirror and projection device with laser beam combining function

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Embodiment Construction

[0033] figure 1 It is a schematic diagram of the working principle of a laser light source with a dichroic mirror, such as figure 1 As shown, the laser module 11 with a wavelength of 460nm is adjusted to emit s-polarized light, which is reflected by the polarization beam splitter (PBS) 13 and then enters the dichroic mirror 14; the laser module 12 is adjusted to emit p-polarized light, which is polarized and split After being transmitted through the filter (PBS) 13, it is incident on the dichroic mirror 14. The two blue laser beams are reflected by the dichroic mirror 14 and then incident on the fluorescent disc 16. The red and green fluorescence excited by the blue laser is reflected by the fluorescent disc 16 and then passes through the dichroic mirror 14; After passing through the fluorescent disk 16, it is collected by an additional optical system composed of three mirrors and a collimating lens, and finally reflected by the dichroic mirror 14. The blue laser light and th...

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Abstract

The invention discloses a dichroic mirror with a laser beam combination function and a projection apparatus. The dichroic mirror comprises a substrate, a dichroic film and an antireflection film; the dichroic film includes a substrate matching film stack, a main film stack and an air matching film stack; the substrate matching film stack is composed of high-refractive index films, second-highest refractive index films and low-refractive index films; high-refractive index films and low-refractive index films are alternately arranged so as to form the main film stack; the air matching film stack is composed of high-refractive index films, second-highest refractive index films, second-lowest refractive index films and low-refractive index films; the high-refractive index films are TiO2 films; the second-highest refractive index films are Ta2O5 films; the second-lowest refractive index films are Al2O3 film; and the low-refractive index films are SiO2 films. The dichroic mirror of the invention can be applied to the projection apparatus. With the dichroic mirror with the laser beam combination function adopted, damage to a beam combination device caused by laser can be avoided, and manufacturing cost can be decreased, and the size of a system can be decreased. The dichroic mirror has a high application value in a laser projection system.

Description

technical field [0001] The invention relates to the field of laser light source modules used in projection devices, in particular to a dichroic mirror with a laser beam combining function and a projection device. Background technique [0002] Almost 95% of existing projectors use high-pressure mercury lamps (UHP) as light sources. Not only are they large in size, heavy in weight, and prone to explosion, but more importantly, they have short service life, low brightness, high energy consumption, and poor color. Use non-environmentally friendly mercury materials. For this reason, the industry has been looking for a light source that can replace UHP. In the field of new light sources, laser (LD) has always been the development direction of new light sources for projection display. Its important advantages are: 1. Long life. At present, the actual service life of UHP is less than 2000 hours, while the laser light source can be greater than 20,000 hours; 2. .High brightness, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00G03B21/20
Inventor 顾培夫艾曼灵张梅骄杨晓华
Owner HANGZHOU KOTI OPTICAL TECH
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