PURPOSE: To read the shape of a key without contact by a non-mechanical way, by providing a light source and a light receiving part at the upper and lower parts of the key to be detected, and using an electric signal, which is generated from the light receiving part in correspondence with the size of the shape of the key as data for assembling a cylinder lock.
CONSTITUTION: A key to be detected 3 is inserted in a measuring position. Light is projected from the upper part of the key 3. The projected light, which is transmitted through the key 3, is inputted to a light receiving part 4. The light receiving part 4 sends the received light signals of photoelectric conversion parts of sectors to an analog multiplexer 10. The analog multiplexer 10 selects the received light signal for every sector and sends the signal to an adder 14. To a subtrator 14, a calibrating signal for each corresponding sector and the actuatlly measured received light signal from the key 3 are simultaneously inputted. The deviation signal is sequentially obtained for every sector. An AD converter 15 performs AD conversion of the output of the subtrator 14.
ISHIKAWA SHINICHIROU
MITSUI KOUICHIROU
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