发明名称 |
REAL IMAGE VIEWFINDER REQUIRING NO FIELD LENS |
摘要 |
A real image zooming viewfinder comprising three optical units with refracting optical power and an additional moving reflective optical unit. Zooming is accomplished by moving one of the refractive optical units and the additional reflective optical unit or by moving the first and the second optical units. The need for field lens is eliminated by having the first and the second unit cooperate to make the finder system telecentric with respect to principal rays at the intermediate image plane.
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申请公布号 |
US5241337(A) |
申请公布日期 |
1993.08.31 |
申请号 |
US19910699284 |
申请日期 |
1991.05.13 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
BETENSKY, ELLIS I.;RUBEN, PAUL L. |
分类号 |
G02B13/18;G02B15/00;G02B15/177;G02B23/14;G03B13/12 |
主分类号 |
G02B13/18 |
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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