US Patent 7330214 Diaphragm apparatus of lens for CCTV camera

Patent 7330214 was granted and assigned to Pentax on February, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Pentax

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

73302140

Patent Inventor Names

Masayuki Arai0

Date of Patent

February 12, 2008

Patent Application Number

099076380

Date Filed

July 19, 2001

Patent Primary Examiner

Lin Ye

Patent abstract

A diaphragm apparatus of a lens for a CCTV camera includes a diaphragm blade which opens and closes a stop aperture of the diaphragm apparatus; and an ND filter which is attached to the diaphragm blade, the ND filter having a spectral transmittance so that the transmittance of infrared radiation therethrough is substantially identical to, or less than, the transmittance of visible light therethrough, or alternatively, the ND filter having a spectral transmittance which cuts out infrared radiation. The ND filter covers the stop aperture when the diaphragm blade is moved to open the aperture.