TTL auto flash control device

Details TTL auto flash control device TTL auto flash control device

1994-06-10

1995-06-06

Adams, Russell E.

354432, G03B 1505

Patent

active

054227020

ABSTRACT:
This specification discloses a TTL auto flash control device for a camera capable of effecting TTL multiple-flash control in which preliminary flashing is effected before exposure and the quantity of flashlight of main flashing during exposure is controlled on the basis of the result of the detection of the reflected light distribution information of the object field. The device has means for measuring the time for which the integration of the object field light is effected while effecting the preliminary flashing, and immediately after the integrated value of the object field light resulting from the preliminary flashing is found, the preliminary flashing is not effected for the same time as the measured integration time, or a time obtained by the measured integration time being multiplied by a predetermined coefficient, to thereby integrate the object field light and find the integrated value of the object field light of only stationary light. A value obtained by the integrated value of the object field light of only the stationary light, or a value obtained by the aforementioned integrated value being divided by the predetermined coefficient, being subtracted from the integrated value of the object field light resulting from the preliminary flashing, is used as the object field reflected light distribution information by the flashlight of an electronic flashing device to determine the degree of weighting of each divided area during main flashing.

REFERENCES:
patent: 4291974 (1981-09-01), Silverberg
patent: 5164759 (1992-11-01), Yasukawa
patent: 5168300 (1992-12-01), Yasukawa
patent: 5172157 (1992-12-01), Takagi
patent: 5221941 (1993-06-01), Matsui et al.
patent: 5231447 (1993-07-01), Takagi
patent: 5231448 (1993-07-01), Sato et al.
patent: 5268730 (1993-12-01), Takagi
Patent Abstracts of Japan, vol. 16, No. 247, (P-1365) 5 Jun. 1992 (JP-A-04 055 837).

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