Back to results
US 7,029,127 B2Granted
Projector
AssigneeSeiko Epson Corporation
InventorsYasunori Ogawa, Hirohisa Nakano
Life of this patent
Estimating the term…
Abstract
A projector includes a light source, a color separating optical system, liquid crystal panels, a cross dichroic prism, and a projection lens, in which an optical filter is disposed to reflect a predetermined spectral component in the light flux between a dichroic mirror and a dichroic mirror where an angle by which the light flux expands falls within 20° with respect to an illumination optical axis L of the light flux on an optical path from the light source device to a light flux-emitting surface of the projecting lens. Thus, carrying out spectrum correction can reduce or prevent the contrast degradation of the projected image. Furthermore, it allows the difference of an incident angle to the light flux-incident surface of the light flux to be smaller, thereby reducing color unevenness.
Claims23
A projector, comprising:
- a light source;
- a color separating optical system to separate a light flux emitted from the light source into a plurality of color light components;
- a plurality of optical modulation devices to modulate the color light components separated by the color separating optical system according to image information, respectively;
- a color combining optical system to combine optical images modulated by the plurality of optical modulation devices;
- and
- a projection optical system to enlarge and project the optical images combined by the color combining optical system,
- an optical filter, to reflect predetermined spectral components in the light flux, being arranged at a position where an angle by which the light flux expands falls within 20° with respect to an illumination optical axis of the light flux on an optical path from the light source to a light flux-emitting surface of the projection optical system.
4 more elements
A projector, comprising:
- a light source;
- a color separating optical system to separate a light flux emitted from the light source into a plurality of color light components;
- a plurality of optical modulation devices to modulate the color light components separated by the color separating optical system according to image information, respectively;
- a color combining optical system to combine optical images modulated by the plurality of optical modulation devices;
- a projection optical system to enlarge and project the optical images combined by the color combining optical system;
- a case to house a plurality of optical components, disposed on an optical path of the light flux;
- an optical filter to reflect predetermined spectral components in the light flux;
- and
- a moving mechanism to move the optical filter into and out of the optical path by rotating the optical filter inside the case.
6 more elements
A projector, comprising:
- a light source;
- a color separating optical system to separate a light flux emitted from the light source into a plurality of color light components;
- a plurality of optical modulation to modulate the plurality of color light components separated by the color separating optical system according to image information, respectively;
- a color combining optical system to combine optical images modulated by the plurality of optical modulation devices;
- a projection optical system to enlarge and project the optical images combined by the color combining optical system,
- an optical filter to reflect predetermined spectral components in the light flux;
- and
- a moving mechanism to move the optical filter into and out of the optical path,
- the moving mechanism sliding the optical filter out of the optical path by allowing a first side, which is closer to an optical component downstream in the optical path from the optical filter and remoter from an optical component upstream in the optical path from the optical filter, to move upstream in the optical path and by allowing a second opposite side to be positioned downstream in the optical path, from among the two sides of the optical filter perpendicular to a plane formed by an illumination optical axis.
6 more elements
A projector, comprising:
- a light source device;
- a color separating optical system to separate a light flux emitted from the light source device into a plurality of color light components;
- a plurality of optical modulation devices to modulate the plurality of color light components separated by the color separating optical system according to image information, respectively,
- a color combining optical system to combine optical images modulated by the plurality of optical modulation devices;
- a projection optical system to enlarge and project the optical images combined by the color combining optical system,
- an optical filter to reflect predetermined spectral components in the light flux;
- a moving mechanism to move the optical filter into and out of the optical path, and
- the moving mechanism moving the optical filter out of the optical path, by allowing an opposite side to be rotated using, as a shaft, the vicinity of a side which is closer to an optical component downstream in the optical path from the optical filter and remoter from an optical component upstream in the optical path from the optical filter, from among the two sides of the optical filter perpendicular to a plane formed by an illumination optical axis.
5 more elements
Dependencies are inferred from the claim text.