PROJECTOR AND CONTROL METHOD THEREFOR

• US 20080246928A1
• Filed: 02/27/2008
• Published: 10/09/2008
• Est. Priority Date: 03/09/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Oka, Daizo, Shirasu, Toshiyuki, MORIKAWA, Hiroyasu
• Granted Patent: US 7,976,173 B2
• Time in Patent Office: Days
• US Class Current: 353/87
• CPC Class Codes: G03B 21/2026 Gas discharge type light sources, e.g. arcs
• CPC Class Codes: G03B 21/2046 Positional adjustment of light sources
• CPC Class Codes: G03B 21/2053 Intensity control of illuminating light controlled by video signal processing H04N5/74 or H04N9/31

Abstract

Disclosed herein is a projector for projecting an image to a screen, including: a lamp configured to emit light; an elliptic reflecting mirror configured to reflect and condense the light from the lamp; an image display device configured to modulate the light reflected and condensed by the elliptic reflecting mirror with image data corresponding to the image to convert the reflected light into image light; a projection lens disposed between the screen and the image display device and configured to project the image light from the image display device to the screen; and a position adjustment mechanism configured to displace the bright point of the lamp from a first focus of the elliptic reflecting mirror to adjust the position of the lamp so as to decrease the effective light amount of the image display device.

Claims

1. A projector for projecting an image to a screen, comprising:

a lamp configured to emit light;

an elliptic reflecting mirror configured to reflect and condense the light from said lamp;

an image display device configured to modulate the light reflected and condensed by said elliptic reflecting mirror with image data corresponding to the image to convert the reflected light into image light;

a projection lens disposed between said screen and said image display device and configured to project the image light from said image display device to said screen; and

a position adjustment mechanism configured to displace the bright point of said lamp from a first focus of said elliptic reflecting mirror to adjust the position of said lamp so as to decrease the effective light amount of said image display device.

2. The projector according to claim 1, wherein said position adjustment mechanism moves the bright point of said lamp on an optical axis of said elliptic reflecting mirror.

3. The projector according to claim 1, wherein said position adjustment mechanism moves the bright point of said lamp in a direction different from that of an optical axis of said elliptic reflecting mirror.

4. The projector according to claim 1, wherein said position adjustment mechanism adjusts the position of said lamp when the aspect ratio of the image displayed on said screen changes.

5. A control method for a projector for projecting an image to a screen, the projector including a lamp configured to emit light, an elliptic reflecting mirror configured to reflect and condense the light from the lamp, an image display device configured to modulate the light reflected and condensed by the elliptic reflecting mirror with image data corresponding to the image to convert the reflected light into image light, a projection lens disposed between the screen and the image display device and configured to project the image light from the image display device to the screen, and a position adjustment mechanism configured to adjust the position of the lamp, the control method comprising the step, executed by the control circuit, of:

displacing the bright point of the lamp from a first focus of the elliptic reflecting mirror to adjust the position of the lamp so as to decrease the effective light amount of the image display device.