Importance

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Abstract

Camera module device (1), which can be mounted onto a camera main body and that is used in a state in which it is mounted onto the camera main body, is provided with a circuit for generating data to be written, and thus camera main body (2) need not be equipped with a function for generating data to be written or a communication function for sending the generated data to camera module device (1). Camera main body (2) simply issues pulse signal X1 for a write instruction, and then data is generated by camera module device (1). Therefore, the camera main body can be made inexpensively. Furthermore, camera module device (1) is provided with a self-check function, and signal RD1 from camera main body (2) places this function in the active mode during photographic film loading. In this mode, circuit board (16) reads the data that has actually been written and determines whether or not the writing operation was performed correctly based on the comparison result of comparison circuit (162). Therefore, correct operation can always be guaranteed.

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First Claim