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US 8,801,305 B2Granted
Exposure control device
AssigneePanasonic Corporation
InventorsShunsuke Yasugi, Kozo Ezawa
Life of this patent
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Abstract
An exposure controller according to the present disclosure is to be arranged on an optical path, and includes first and second light quantity regulators, each of which has a first region that has a property of transmitting a light beam polarized in a particular direction and a second region that does not have the property of transmitting a light beam polarized in the particular direction. The exposure controller regulates the quantity of light by rotating the first and second light quantity regulators.
Claims19
An exposure controller to be arranged on an optical path, the controller comprising:
- first and second light quantity regulators, each of which has a first region that has a property of transmitting a light beam polarized in a particular direction and a second region that does not have the property of transmitting a light beam polarized in the particular direction, and
- a rotating mechanism which regulates the quantity of light by rotating the first and second light quantity regulators, the rotating mechanism being switched between a state where rotating velocities of the first and second light quantity regulators are not equal and a state where rotating velocities of the first and second light quantity regulators are equal.
Dependencies are inferred from the claim text.