Image taking apparatus including a light quantity control...

Details Image taking apparatus including a light quantity control... Image taking apparatus including a light quantity control...

2006-11-01

2010-02-23

Mahoney, Christopher (Department: 2862)

Photography

Exposure control circuit

With exposure filter

C396S457000, C396S506000

Reexamination Certificate

active

07668453

ABSTRACT:
The image taking apparatus of the invention includes a light quantity control device that is arranged on the optical axis of subject light and controls transmitted volume of the subject light. The light quantity control device includes a light quantity control layer and a pair of light-transmissive electrodes. The light quantity control layer expands and contracts in accordance with an electric field generated therein and thereby changes the transmitted volume of the subject light. The electrodes are disposed so as to sandwich the light quantity control layer and generate an electric field in the light quantity control layer, in response to application of voltage, thereby causing the light quantity control layer to expand and contract.

REFERENCES:
patent: 4645304 (1987-02-01), Kawamura et al.
patent: 6097451 (2000-08-01), Palmer et al.
patent: 6359664 (2002-03-01), Faris
patent: 2002/0118464 (2002-08-01), Nishioka et al.
patent: 2001-083554 (2001-03-01), None
patent: 2003205496 (2003-07-01), None

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