PHOTOMETRIC INSTRUMENT OF CAMERA

摘要

PURPOSE:To prevent the inadvertent change of a storage value by constituting a titled instrument in such a manner that the recording of the output from a photometric circuit by the operation of the other switch is prohibited during the operation of one of the two storage switches and the storage of a measured value. CONSTITUTION:The photometric value Ev of a measuring circuit consisting of a measuring amplifier 1, a photometric sensor 2 and a logarithmic compression diode 3 is fed to a microcomputer uCOM8 and is stored in a storage circuit when the switch 22 for starting the photometric operation is turned on. The storage is maintained while the switch 22 is held on. The storage of the fresh output from the photometric circuit is prohibited even if the photometric storage switch 23 for multispot photometry is turned on during the time since the switch 22 is turned on until said switch is turned off. The inadvertent change of the storage value determined once by one switch is thus prevented.