Supercharge Your Innovation With Domain-Expert AI Agents!

Illumination opitcal system and projector

A lighting optical system and optical element technology, applied in the field of projectors, can solve problems such as difficult to realize, high price, and changing spectral characteristics

Inactive Publication Date: 2007-04-11
SEIKO EPSON CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a wavelength selective retardation film or a polarization beam splitter with a spectroscopic function, it is difficult to realize a sharply changing spectroscopic characteristic and the cost is high.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Illumination opitcal system and projector
  • Illumination opitcal system and projector
  • Illumination opitcal system and projector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0056] FIG. 1 shows an embodiment of a projector comprising the illumination optical system of the present invention. This projector has: an illumination optical system 10 ; a color separation and synthesis optical system 100 ; three reflective liquid crystal panels 200R, 200G, and 200B as light modulators; and a projection lens 210 .

[0057] The illumination optical system 10 has: a light source 20 emitting substantially parallel light beams; a first lens array 30 constituting a beam splitting optical element; a color light separation optical element 40; a polarization conversion element 50; a second lens array 60 constituting a transmission optical element; The superimposed lens 70 as a superimposed optical element has a function of generating illumination light beams having substantially the same polarization direction for each color light.

[0058] The light source 20 has a light source lamp 21 and a concave mirror 22 . The light emitted from the light source lamp 21 is ...

Embodiment approach 2

[0087] Fig. 3 shows another embodiment of a projector comprising the illumination optical system of the present invention. This embodiment differs from the first embodiment described above in the arrangement of the mirrors 41 and 42 of the color light separation optical element 40 and the provision of the color separation filter array 56 . About other structure, it is the same as Embodiment 1. In addition, in each embodiment described later including this embodiment, the same reference numerals as those attached to Fig. 1 and Fig. 2 are assigned to the same constituent elements as those already described, and the symbols are omitted. illustrate. In addition, in the color separation / synthesis optical system 100 of FIG. 3 , light rays drawn with solid lines indicate P-polarized light, and light rays drawn with dotted lines indicate S-polarized light.

[0088] In this embodiment, the dichroic mirror 41 and the reflecting mirror 42 of the color light separation optical element 4...

Embodiment approach 3

[0093] Figure 4 shows another embodiment of a projector comprising the illumination optical system of the present invention. This embodiment differs from the second embodiment described above mainly in the arrangement of the mirrors 41 and 42 of the color light separation optical element 40 and the structure of the second lens array 60 . About other structure, it is the same as Embodiment 2. In the color separation / synthesis optical system 100 in FIG. 4, the light rays drawn by solid lines indicate P-polarized light, and the light rays drawn by dotted lines indicate S-polarized light.

[0094] In the present embodiment, the dichroic mirror 41 and the reflective mirror 42 of the color light separation optical element 40 are parallel to each other and arranged at a predetermined distance t along the direction of the optical axis La. Here, the predetermined amount t is substantially equal to the interval in the direction along the incident end face 51 a of the polarization split...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The quality of image projected by a projector comprising a color separating / combining optical system using a 45-degree dichroic element is enhanced by reducing the dependence of the spectral characteristics of the 45-degree dichroic element on the polarization. The illumination optical system has a color light direction changing element (40) and a polarization converting element (50). The color light changing element (40) separates the light into a green light and a blue+red light, and the polarization converting element (50) adjusts the directions of polarization of the lights.

Description

technical field [0001] The present invention relates to an illumination optical system that makes the in-plane illuminance distribution of light emitted from a light source uniform, and a projector including the optical system. Background technique [0002] As a liquid crystal projector, a so-called three-panel reflective liquid crystal projector using three reflective liquid crystal panels is known. In a 3-chip reflective liquid crystal projector, the light emitted from the light source is divided into three primary colors of light, red (R), green (G), and blue (B), by using a color separation system. The three reflective liquid crystal panels of each color light are illuminated by colored light, and the three primary color lights modulated by each reflective liquid crystal panel are color synthesized, and the resulting color image is enlarged and projected on the screen by a projection lens. [0003] In the reflective liquid crystal projectors described above, an optical ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G02F1/13G02B27/14H04N9/31
CPCH04N9/3197H04N9/3167G02B27/141G02B27/1046G02B27/149G02B27/285G02B27/148G02B27/1086H04N9/3105G02B27/145G02B27/283G02B27/1026G02B27/28
Inventor 伊藤嘉高
Owner SEIKO EPSON CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com