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Illuminating device and projector

A technology for lighting devices and optical surfaces, applied to lighting devices, components of lighting devices, projection devices, etc., can solve the problem of increased infrared and ultraviolet rays, reduced filter efficiency, and inability of filters to play their original role, etc. question

Inactive Publication Date: 2007-10-03
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, light is incident on the filter at various angles, so for some light rays, the filter may not be able to perform its original function.
That is, the efficiency of the filter decreases, so that the amount of infrared and ultraviolet rays transmitted through the filter increases

Method used

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  • Illuminating device and projector
  • Illuminating device and projector
  • Illuminating device and projector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0030] FIG. 1 is a schematic diagram illustrating the configuration of an optical system of a projector according to a first embodiment of the present invention.

[0031] The projector 10 is an optical device that modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the optical image on a screen, and is composed of a light source lamp unit 20, an illumination optical system 30, and a color separation device. 40 . The light modulation unit 50 , the cross dichroic prism 60 and the projection optical system 70 . Among them, the light source lamp unit 20 and the illumination optical system 30 constitute an illumination device that emits illumination light for illuminating the light modulator 50 .

[0032] The light source lamp unit 20 gathers and emits the light beams radiated from the lamp body 21 to the surroundings, and illuminates the light modulator 50 through the illumination optical system 30 a...

no. 2 Embodiment

[0060] Fig. 5 is a side view illustrating the light source lamp unit 120 of the lighting device according to the second embodiment. The light source lamp unit 120 is a component assembled in place of the light source lamp unit 20 in the projector 10 according to the first embodiment shown in FIG. 20 have the same structure, and the common parts are denoted by the same symbols and repeated descriptions are omitted.

[0061] In the light source lamp unit 120 of this embodiment, the main reflector 122 is not an ellipse but a paraboloid. The main reflector 122 reflects light emitted from a lamp body (not shown) to emit as parallel light. Therefore, a plano-convex lens 123A and a concave-plano lens 123B are sequentially arranged on the light-emitting side of the main reflector 122 , that is, the light-emitting side of the lamp device 120A having the main reflector 122 and the lamp body. The plano-convex lens 123A is a lens for changing parallel light emitted from the main mirror ...

no. 3 Embodiment

[0064] In the second embodiment, instead of tilting the plano-convex lens 123A, the concave-plano lens 123B is tilted. On the contrary, it is also possible to form the filter 28 on the flat surface of the plano-convex lens 123A so that the normal line of the flat surface of the plano-convex lens 123A Tilt relative to lamp axis OA. In this embodiment, such an example will be described. Fig. 6 is a side view illustrating the light source lamp unit 220 of the lighting device according to the third embodiment. The light source lamp unit 220 has the same structure as that of the light source lamp unit 120 of the second embodiment except for the parts not described in particular.

[0065] In the light source lamp unit 220 of this embodiment, plano-convex lenses are sequentially disposed on the light emitting side of the main reflector 122, that is, on the light emitting side of the lamp device 120A having the main reflector 122 and the lamp body (not shown). 223A and concave flat ...

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PUM

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Abstract

An illuminating device includes: a lamp device that includes a lamp body, which is a light source, and a concave reflector for reflecting light emitted from the lamp body; and a lens member that has a planar optical surface and a nonplanar optical surface opposite to the planar optical surface and is provided on an emission side of the lamp device. In the illuminating device, the lens member is arranged such that a normal line of the planar optical surface is slightly inclined at a predetermined angle with respect to an optical axis of the lamp device. The lens member is arranged such that light beams substantially parallel to the optical axis are incident on the planar optical surface, and a filter that reflects at least one of an ultraviolet ray and an infrared ray is provided on the planar optical surface.

Description

technical field [0001] The present invention relates to a lighting device using a lamp, and a projector including a light modulation device such as a liquid crystal panel illuminated by the lighting device. Background technique [0002] As an optical system for a projector, there is a system that has a pair of dichroic mirrors that separate white light from a projection light source into red, blue, and green, and an optical path on the side of the separated red is provided as an infrared mirror. A mirror for bending an optical path that functions as a filter is removed, and a mirror for bending an optical path that functions as a filter for removing ultraviolet rays is provided on the separated optical path on the blue side. [0003] Among optical systems for projectors, there is an optical system in which a pair of fly-eye lenses for uniformizing light are arranged on the front of a light source lamp, and the incident side of the front-stage fly-eye lens is used as a convex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G03B21/00G02B5/10G02B3/02F21Y101/00
CPCH04N9/315G03B21/20G03B21/2026F21V9/06F21V5/04F21V9/04G03B21/2053F21V7/22
Inventor 流川理家近尚志加藤久麿
Owner SEIKO EPSON CORP
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