Title:
投射型画像表示装置
Document Type and Number:
Japanese Patent JP4497890
Kind Code:
B2
Abstract:
The present invention discloses an image-projecting apparatus which employs an AF (auto-focusing) system suitable for use conditions of the image-projecting apparatus and is capable of securing satisfactory AF accuracy under bright conditions. The image-projecting apparatus comprises a projection optical system which projects light from an image-forming element onto a projection surface, and a detecting system which performs a detecting operation of a distance to the projection surface or a detecting operation of a focusing state of the projection optical system with respect to the projection surface. The detecting system determines a condition of the detecting operation on the basis of the light-receiving intensity level of the light-receiving element which receives reflected light from the projection surface of light projected and performs the detecting operation in accordance with the condition.
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Inventors:
Shoji Eguchi
Application Number:
JP2003371345A
Publication Date:
July 07, 2010
Filing Date:
October 30, 2003
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B7/28; H04N5/74; G01B11/00; G02F1/13; G03B21/00; G03B23/02
Domestic Patent References:
| JP5188282A | ||||
| JP2002206923A | ||||
| JP62169118A | ||||
| JP2002311503A | ||||
| JP2002300498A | ||||
| JP2002341437A |
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsushi Mizumoto
Atsushi Mizumoto