发明名称 |
Two-prism viewfinder for photographic or video camera - produces real image in neighbourhood of frame inserted between adjacent faces of polygonal and triangular prisms |
摘要 |
Negative and positive lenses (2a,2b) of the viewing lens (1) are both movable along their common axis (1a) ahead of a prism unit (3). An incident beam of light from the viewing lens strikes a first prism (6) on its entry face (6a) which is curved to form, with the viewing lens, a telecentric optical system. After internal reflections at successive faces (6b,6c) it enters (7a) a second prism (7), undergoing three reflections (7b-7d) before emerging (7e) into an eyepiece (5) through which an upright image is seen. ADVANTAGE - Non-inverted real image produced in plane of frame (8) by optics with smaller dimensions in both vertical and horizontal directions.
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申请公布号 |
DE4330601(A1) |
申请公布日期 |
1994.04.07 |
申请号 |
DE19934330601 |
申请日期 |
1993.09.09 |
申请人 |
CANON K.K., TOKIO/TOKYO, JP |
发明人 |
KOYAMA, TAKESHI, YOKOHAMA, KANAGAWA, JP;YAMAZAKI, SHOUICHI, YOKOHAMA, KANAGAWA, JP |
分类号 |
G02B23/14;G03B13/06;G03B13/12;(IPC1-7):G02B23/14 |
主分类号 |
G02B23/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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