Title:
REFLECTION TYPE FIELD ANGLE CONVERSION OPTICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/1994/012905
Kind Code:
A1
Abstract:
An optical device for converting the field angle of an imaging device or the like, the mechanical strength is enhanced and the fabrication is facilitated by the use of a reflecting mirror even in a wide angle optical system. This device comprises a main mirror (8) having a reflecting surface of rotationally symmetrical shape for reflecting the incident light (12) as primary reflected light (13); a sub-mirror (10) having a reflecting surface of rotationally symmetrical shape with respect to the axis of rotational symmetry of the main mirror (8), facing to the main mirror (8), and reflecting the primary reflected light (13) as secondary reflected light (14) to condense it at the point of view; and a transparent case (11) supporting the main mirror (8) and the sub-mirror (10), and transmitting the incident light (12).
Inventors:
KURODA TAKESHI (JP)
TAKEYA AKITO (JP)
NISHIGUCHI KENICHI (JP)
ICHIKAWA AKIRA (JP)
TAKEYA AKITO (JP)
NISHIGUCHI KENICHI (JP)
ICHIKAWA AKIRA (JP)
Application Number:
PCT/JP1993/001743
Publication Date:
June 09, 1994
Filing Date:
November 30, 1993
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
KURODA TAKESHI (JP)
TAKEYA AKITO (JP)
NISHIGUCHI KENICHI (JP)
ICHIKAWA AKIRA (JP)
KURODA TAKESHI (JP)
TAKEYA AKITO (JP)
NISHIGUCHI KENICHI (JP)
ICHIKAWA AKIRA (JP)
International Classes:
G02B13/06; G02B17/06; G02B26/08; (IPC1-7): G02B17/06
Domestic Patent References:
| WO1982002609A1 | 1982-08-05 |
Foreign References:
| JPS6262315A | 1987-03-19 | |||
| JPS5387727A | 1978-08-02 |
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