Control of output voltage provided to a flash unit

Details Control of output voltage provided to a flash unit Control of output voltage provided to a flash unit

2008-10-09

2010-11-09

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C396S164000, C396S172000

Reexamination Certificate

active

07829831

ABSTRACT:
A device includes a flash unit to generate light, and an optical sensor to receive the light from the flash unit, and generate a light intensity signal based on the received light. The device also includes a controller to generate a modified error signal based on the light intensity signal. The device further includes a control circuit to receive the modified error signal from the controller, receive an output voltage from a power source associated with the device, control the output voltage based on the modified error signal, and provide the controlled output voltage to the flash unit.

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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration corresponding to PCT/IB2009/050867 mailed on Sep. 2, 2009, 13 pages.

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