Title:
DIAPHRAGM
Document Type and Number:
WIPO Patent Application WO/2004/107036
Kind Code:
A1
Abstract:
A small, lightweight diaphragm being fixed readily to the lens-barrel of a CCTV camera and equipped with an optical filter being inserted retractably on the optical path. The diaphragm comprises a diaphragm substrate (10) having an opening (10a) forming the optical path, a pair of diaphragm blades (12, 13) placed on one plate surface of the diaphragm substrate and restricting the optical path by sliding along that plate surface, a driver (20) for driving the diaphragm blades (12, 13) in order to restrict the optical path, an optical filter (infrared cut filter) having transmission characteristics dependent on the wavelength, and a filter driver (30) for inserting the optical filter on the optical path or removing it from the optical path. The optical filter is formed into a thin film shape and placed between two diaphragm blades (12, 13) slidably along the diaphragm blades. The optical filter (15) is supported rotatably on a supporting shaft (10c), and the diaphragm driver (20) and the filter driver (30) are arranged on the same side with respect to the optical path.
Inventors:
NEGISHI SHIGETO (JP)
SAITOH SHIGEKI (JP)
TOMARU TAKASHI (JP)
SAITOH SHIGEKI (JP)
TOMARU TAKASHI (JP)
Application Number:
PCT/JP2003/006753
Publication Date:
December 09, 2004
Filing Date:
May 29, 2003
Export Citation:
Assignee:
NIHON SEIMITSU SOKKI CO LTD (JP)
NEGISHI SHIGETO (JP)
SAITOH SHIGEKI (JP)
TOMARU TAKASHI (JP)
NEGISHI SHIGETO (JP)
SAITOH SHIGEKI (JP)
TOMARU TAKASHI (JP)
International Classes:
G03B9/02; G03B9/04; G03B11/00; (IPC1-7): G03B9/02; G03B11/00
Foreign References:
JP2002189238A | 2002-07-05 | |||
JPH11109440A | 1999-04-23 | |||
JPH11149104A | 1999-06-02 | |||
JPH0267530A | 1990-03-07 | |||
JPH10133254A | 1998-05-22 | |||
JP2003005005A | 2003-01-08 | |||
JP2000106649A | 2000-04-11 | |||
JPH10254022A | 1998-09-25 | |||
JP2002049073A | 2002-02-15 |
Attorney, Agent or Firm:
Aniya, Setuo (4-6-1 Iidabash, Chiyoda-ku Tokyo, JP)
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