发明名称 |
Flash device, lens-fitted photo film unit, camera, and producing method for the same |
摘要 |
In a lens-fitted photo film unit, a flash device has a booster circuit including primary and secondary windings, the secondary winding generating high voltage when power source voltage is applied to the primary winding. A main capacitor is charged by the high voltage in the secondary winding. A flash discharge tube is connected in parallel with the main capacitor, for emitting flash light upon discharge with electric energy from the main capacitor. A trigger circuit discharges the flash discharge tube upon a switching operation. A photo transistor measures reflected light from an object illuminated by the flash light, to output a light amount signal. A light amount control circuit quenches discharge of the flash discharge tube when an integration value of the light amount signal comes up to a predetermined value. A powering voltage generator circuit is connected with the secondary winding, for generating powering voltage adapted for powering the light amount control circuit in response to operation of the trigger circuit.</PTEXT>
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申请公布号 |
US6633728(B2) |
申请公布日期 |
2003.10.14 |
申请号 |
US20010956984 |
申请日期 |
2001.09.21 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
MOTOMURA KATSUMI |
分类号 |
G03B15/05;H05B41/32;(IPC1-7):G03B15/05 |
主分类号 |
G03B15/05 |
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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