| 摘要 |
A lens-fitted photo film unit includes a photo film housing. A photo film roll chamber is formed in the photo film housing and pre-loaded with photo film in a roll form. A cassette holder chamber incorporates a photo film cassette, to wind the photo film therein after being exposed. A flash-emission main capacitor stores charge by a charging operation. A flash discharge tube emits flash light by a discharging operation of the charge. A flash circuit controls the main capacitor and the flash discharge tube for effecting the charging operation and the discharging operation. An EEPROM is incorporated in the photo film cassette. A write control IC is incorporated in the photo film housing, for writing information to EEPROM. A battery supplies the flash circuit and the write control IC with power. A charge control signal generator or BUSY terminal is disposed in the write control IC, and supplies the flash circuit with a low-level inhibit signal, to inhibit the flash circuit from effecting the charging operation. The write control IC controls the charge control signal generator, to write the information while the flash circuit is inhibited from effecting the charging operation. A power source voltage of the battery is prevented from dropping while the information is written.
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