Image capture apparatus with charged capacitor switching...

Details Image capture apparatus with charged capacitor switching... Image capture apparatus with charged capacitor switching...

2011-03-22

2011-03-22

Laballe, Clayton E (Department: 2862)

Photography

With object illumination for exposure

Having preexposure illumination

C396S205000

Reexamination Certificate

active

07912365

ABSTRACT:
A charged capacitor switching device for a photoflash is provided and includes a flash control unit, a capacitor charging/discharging unit, a charged capacitor switching unit and an illumination modulator. The capacitor charging/discharging unit coupled to the flash control unit includes a plurality of capacitors connected in parallel and switches coupled thereto respectively. The charged capacitor switching unit determines whether each switch is opened or closed according to a compensation parameter. The illumination modulator compares an environmental illumination and a pre-flash illumination to generate a compared result, determines whether the compared result has reached a threshold, obtains the compensation parameter according to the compared result when the compared result is below the threshold, and drives the flash control unit to generate a flash illumination corresponding to the compensation parameter.

REFERENCES:
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patent: 6151073 (2000-11-01), Steinberg et al.
patent: 6198880 (2001-03-01), Hosaka et al.
patent: 6456797 (2002-09-01), Boyd et al.
patent: 7512333 (2009-03-01), Carnevale et al.
patent: 2001/0019364 (2001-09-01), Kawahara
patent: 2007/0110427 (2007-05-01), Tsai
patent: 2009/0160944 (2009-06-01), Trevelyan et al.
patent: 2060288 (1981-04-01), None

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