Patent ID: 7450187

Claim:
A liquid crystal shutter device for a camera, comprising: a power supply; an image recording plate; a switch having first and second positions, wherein when the switch is in one of its positions, light is allowed to enter the camera through the shutter device to be recorded on the image recording plate, and when the switch is in its other position, light is prevented from entering the camera through the shutter device and being recorded on the image recording plate; a liquid crystal box connected to the power supply and the switch, the liquid crystal box including: a first electric plate, including a first transparent base and a first transparent electroplated layer, the first base being coated with the first electroplated layer; a first polarizing filter formed on a surface of the first electric plate; a second electric plate parallel to the first electric plate, the second electric plate including a second transparent base and a second transparent electroplated layer, the second base being coated with the second electroplated layer; a second polarizing filter, the axial direction of the second polarizing filter being perpendicular to that of the first polarizing filter, the second polarizing filter being formed on a surface of the second electric plate; and a predetermined amount of liquid crystal contained between the first electric plate and the second electric plate; wherein the power supply, the switch, and the liquid crystal box are electrically connected in series and form a control circuit.