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Light source device and image display apparatus

A technology of a light source device and a light source unit, which is applied in the direction of lighting devices, projection devices, lighting device components, etc., can solve the problems of reduced durability of lenses and mirrors, low transmittance of optical resins, and reduced light utilization efficiency, etc., and achieves miniaturization The effect of the number of parts

Inactive Publication Date: 2013-12-18
HITACHI MEDIA ELECTORONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optical glass and optical resin used in lenses and mirrors have low transmittance, so light utilization efficiency decreases
There is a problem that the durability of lenses and mirrors decreases

Method used

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  • Light source device and image display apparatus
  • Light source device and image display apparatus
  • Light source device and image display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 It is a top view showing main parts of the light source device and the image display device according to the first embodiment of the present invention.

[0026] Blue (B) light 2 that becomes substantially parallel light from a blue laser diode (B-LD) light source unit 1 enters a dichroic mirror 3 . Hereinafter, the blue laser diode is abbreviated as B-LD, and the blue is abbreviated as B. The B-LD light source unit 1 is composed of a plurality of B-LDs not shown. The dichroic mirror 3 has spectral transmissive reflectance characteristics that reflect B light, transmit green (G) light, and transmit red (R) light. Hereinafter, green is abbreviated as G, and red is abbreviated as R.

[0027] The B light 4 reflected by the dichroic mirror 3 is refracted by the lenses 5 and 6 , condensed to approximately one point, and enters the color wheel 7 .

[0028] The lens 5 and the lens 6 are configured to have a common optical axis 8 , and the B light 4 is deviated fro...

Embodiment 2

[0042] image 3 It is a top view showing main parts of a light source device and an image display device according to Embodiment 2 of the present invention. Here, the numbers in the accompanying drawings represent the same figure 1 , figure 2 same part.

[0043] The B light 2 from the B-LD light source unit 1 that becomes substantially parallel light enters the dichroic mirror 23 a. The dichroic mirror 23 a has spectral transmission reflectance characteristics of transmitting B light, reflecting G light, and reflecting R light.

[0044] The B light 4 transmitted through the dichroic mirror 23 a is refracted by the lenses 5 and 6 , condensed to approximately one point, and enters the color wheel 7 .

[0045] The lens 5 and the lens 6 are configured to have a common optical axis 8, and the B light 4 is deviated from the optical axis 8 by approximately half to the right in the drawing. That is, the dichroic mirror 23a is disposed approximately halfway to the right of the op...

Embodiment 4

[0079] Figure 6 It is a top view showing main parts of a light source device and an image display device according to Embodiment 4 of the present invention.

[0080] The B light 2 that is substantially parallel light from the B-LD light source unit 1 enters the dichroic mirror 31 a. The dichroic mirror 31 a has a spectral transmission reflectance characteristic of transmitting B light, reflecting G light, and transmitting R light.

[0081] The B light 4 transmitted through the dichroic mirror 31 a is refracted by the lenses 5 and 6 , is condensed to approximately one point, and enters the color wheel 25 .

[0082] The lens 5 and the lens 6 are configured to have a common optical axis 8, and the B light 4 is deviated from the optical axis 8 by approximately half to the right in the drawing. In other words, the dichroic mirror 31 a is disposed approximately halfway to the right of the optical axis 8 in the drawing.

[0083] Color Wheel 25 with Figure 5 Similar to the third...

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Abstract

A light source device and an image display apparatus include a Blue Laser Diode (B-lD) light source unit, a dichroic mirror to reflect substantially collimated Blue (B) light from the B-lD light source unit, a lens to focus the B light reflected by the dichroic mirror, and a color wheel comprising a Green (G) fluorescent section which is excited by the collimated B light to emit and to reflect G light and a B mirror reflector to mirror-reflect the B light, wherein a center of a light flux of the B light reflected by the dichroic mirror is on other than an optical axis of the lens.

Description

technical field [0001] The present invention relates to a light source device and an image display device, and is preferably applied to, for example, a light source device and an image display device using a blue laser light source and a color wheel including a phosphor. Background technique [0002] Conventionally, instead of an ultrahigh-pressure mercury lamp, a light source device and an image display device that emit blue light and green light using a blue laser light source and a color wheel including a green phosphor have been proposed. Compared with the ultra-high pressure mercury lamp, the blue laser light source can emit light instantaneously and extinguish instantaneously, so it has the advantage of shortening the preparation and withdrawal time of the image display device. In addition, since the life of the blue laser light source is longer than that of an ultra-high pressure mercury lamp, there is also an advantage that the number of times of replacement of the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V13/00G03B21/20G02B27/18
CPCG03B21/204G03B33/08F21V13/14
Inventor 小沼顺弘羽藤顺矢部昭雄
Owner HITACHI MEDIA ELECTORONICS CO LTD
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