Patent
1987-12-04
1988-11-29
Hix, L. T.
35428912, G03B 1700
Patent
active
047885670
ABSTRACT:
An output information system for an interchangeable lens (Y) usable with a microprocessor based camera system (X) for transmitting specific data about the lens (Y) to the microprocessor in the camera body (X) comprises a binary counter (CO) which counts each of n clock pulses transmitted from the microprocessor, and a discriminator gate array (AN.sub.1 to AN.sub.6, AN.sub.11 to AN.sub.15) connected to the counter (CO) for comparing the n clock pulse number which has a predetermined logic level among the specific data for producing the logic level as an output discriminated logic level via an output gate (OR, NOR) when the counted value of the counts (CO) is in agreement with the output discriminating condition of the gate array (AN.sub.1 to AN.sub.6, AN.sub.11 to AN.sub.15), the opposite logic level being provided as an output bit to the microprocessor when the counted value of the counter (CO) is not in agreement therewith. The data is then serially transmitted to the camera body (X) from the lens (Y), with the clock pulses also being serially sent to the lens (Y) from the camera body (X). The type of gate array (AN.sub.1 to AN.sub.6 or AN.sub.11 to AN.sub.15) is chosen based on whether the greater number of specific data bits are to be highs or lows.
REFERENCES:
patent: 4149795 (1979-04-01), Sakruda et al.
patent: 4509842 (1985-04-01), Taniguchi et al.
Gray David M.
Hix L. T,.
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