PROJECTION TYPE DISPLAY DEVICE AND FOCUSING METHOD FOR THE SAME

Japanese Patent JP2006184569

A

To provide a projection type display device in which a focusing mechanism is simplified.

On the basis of an output signal from a line sensor 16, the focal distance of a range finding lens 32, and a base length equivalent to an interval between the optical axis of a projection lens 31 and the optical axis of the range finding lens 32, a control part 11 calculates a distance between the projection reference point of the projection lens 31 and the point at which a projection optical axis on a screen 40 and a screen face intersect through trigonometric range finding. On the basis of the calculated distance, a motor drive signal (MD) is generated and a motor 19 is driven to control the rotary position of a focus ring 20, and focusing of the projection lens 31 is carried out.

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SAITO KIMIAKI

JP2004378186A

July 13, 2006

December 27, 2004

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TOSHIBA CORP

G03B21/00; G03B21/26

Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto

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