US Patent 7374289 Projection type video display

Patent 7374289 was granted and assigned to Sanyo on May, 2008 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Sanyo

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

73742890

Patent Inventor Names

Hisashi Nakamura0

Date of Patent

May 20, 2008

Patent Application Number

112295320

Date Filed

September 20, 2005

Patent Primary Examiner

‌

Christopher Mahoney

Patent abstract

A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is blocked (referred to as a closing state of the shutter device) and a state where illuminating light passes through (referred to as an opening state of the shutter device). A system control circuit instructs a panel cooling fan-use power source to decrease a fan rotation speed, when receiving information indicating that the shutter device is in the closing state from the detecting portion. After receiving this instruction, the panel fan power source decreases power supplied to the panel cooling fan (fan motor).

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