Title:
改良された光学対称性を有する広い視野の凝視赤外線センサ用の光学系
Document Type and Number:
Japanese Patent JP2006524823
Kind Code:
A
Abstract:
A wide-angle IR imaging system ( 1 A) has an entrance aperture ( 40 ) for admitting IR from a scene and a dewar ( 4 A) that contains a coldshield ( 3 ) that encloses a cooled IR detector ( 2 ) disposed at an image plane ( 2 A). The dewar includes a dewar window ( 4 ), and an optical axis of the IR imaging system passes through the dewar window and the image plane. The IR imaging system further includes a plurality of uncooled optical elements ( 22, 24, 26, 28 ) disposed along the optical axis between the entrance aperture and the dewar window, and a plurality of generally annular reflector segments ( 18 A, 18 B) disposed around the optical axis between the dewar window and the entrance aperture. Each of the reflector segments has a reflective surface that faces the dewar window. An opening through an outermost reflector segment furthest from the dewar window defines an effective cooled aperture stop, or warm stop ( 20 A) of the IR imaging system, and at least one of the optical elements ( 22 ) is disposed between the effective cooled aperture stop and another one of the reflector segments ( 18 A) that is located nearer to the dewar window. In the preferred embodiment the at least one optical element, and the reflector segment that is located nearer to the dewar window, are comprised of a single monolithic body ( 31 ) that has a compound optical surface.
Inventors:
Wellman, William
Anderson, Douglas
Borchard, Joseph Ef.
Anderson, Douglas
Borchard, Joseph Ef.
Application Number:
JP2006513259A
Publication Date:
November 02, 2006
Filing Date:
April 23, 2004
Export Citation:
Assignee:
Raytheon Company
International Classes:
G01J1/02; G01J5/06; G01J5/08; G02B13/14
Domestic Patent References:
| JPH10246668A | 1998-09-14 |
Foreign References:
| US4820923A | 1989-04-11 | |||
| US4783593A | 1988-11-08 |
Attorney, Agent or Firm:
Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Ryo Hashimoto
Tetsuya Kazama
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Ryo Hashimoto
Tetsuya Kazama