| 发明名称 |
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| 摘要 |
<p>A fluid crystal whose light transmissivity changes as a function of applied voltage is positioned in the path of the light from the objective lens to the film of the camera. Electrical contacts of the fluid crystal are connected to the output and the direction input of an operational amplifier which has an associated timing circuit. Fade-in and fade-out are produced by activation of a switch which alternatively connects the inverting input of the operational amplifier, through a timing resistor, to a battery or to the direct input of one operational amplifier. The fluid crystal is positioned following a standard exposure control circuit in the direction of light propagation towards the film, so that the operation of the exposure control circuit is not affected by the presence of this crystal.</p> |
| 申请公布号 |
DE2156462(C3) |
申请公布日期 |
1980.03.13 |
| 申请号 |
DE19712156462 |
申请日期 |
1971.11.13 |
| 申请人 |
AGFA-GEVAERT AG, 5090 LEVERKUSEN |
发明人 |
WAGENSONNER, EDUARD, 8011 ASCHHEIM |
| 分类号 |
G03B19/18;G03B7/08;G03B7/085;G03B9/08;G03B19/26;(IPC1-7):03B7/10 |
主分类号 |
G03B19/18 |
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