Camera exposure apparatus having flash tubes for correcting for

Details Camera exposure apparatus having flash tubes for correcting for Camera exposure apparatus having flash tubes for correcting for

1997-02-18

1998-02-10

Perkey, W. B.

Photography

With object illumination for exposure

Activated under low light condition

396174, 396182, G03B 1505

Patent

active

057179646

ABSTRACT:
An exposure apparatus for flash illuminating a subject is disclosed. The exposure apparatus includes a main flash tube for directly illuminating the subject, a bounce flash tube for indirectly illuminating the subject, and sensing circuitry responsive to ambient scene illumination for producing an ambient scene illumination signal, and responsive to light from the main flash tube reflected from the subject for producing a reflected flash illumination signal. The exposure apparatus further includes circuitry for defining a first reference voltage signal corresponding to a predetermined scene illumination level, circuitry for defining a second reference voltage signal corresponding to a predetermined reflected flash illumination level, first voltage comparator circuitry responsive to the ambient scene illumination signal and the first reference voltage signal for producing a main flash signal to energize the main flash tube when the ambient scene illumination signal is below the predetermined ambient scene illumination level, and second voltage comparator circuitry responsive to the reflected flash illumination signal and the second reference voltage signal for producing a bounce flash signal to energize the bounce flash tube and deenergize the main flash tube when the reflected flash illumination signal is above the predetermined reflected flash illumination level.

REFERENCES:
patent: 4384238 (1983-05-01), Greenwald et al.
patent: 5136312 (1992-08-01), Weaver et al.

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