Optical device, optical equipment and method for manufacturing Optical Device
AssigneeNikon Corporation
InventorsMitsuhiro Okazaki, Koichiro Iwahori
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Abstract
An optical device comprises a substrate provided with an insulation portion transmitting light, a first electrode and a second electrode transmitting light provided at said substrate sandwiching said insulation portion, and an output circuit to output voltage to said first electrode and second electrode so as to change an electric field of a surface of said substrate, wherein said first and second electrodes comprise main component which is identical with said insulation portion, and an electric resistivity is lower with respect to said insulation portion.
Claims12
An image pickup device comprising
- an image pickup element taking an image;
- an optical low pass filter transmitting light positioned closer to a subject than said image pickup element;
- an insulation portion transmitting light, provided on the optical low pass filter;
- a first electrode and a second electrode transmitting light provided on said optical low pass filter so as to sandwich said insulation portion along a direction parallel to an image pick up face of the image pickup element;
- and
- an output circuit configured to output voltage to said first electrode and second electrode so as to change an electric field of a surface of said optical low pass filter,
- wherein:
- said first and second electrodes comprise a main component which is the same main component of said insulation portion, and has an electric resistivity lower than that of said insulation portion.
A method for manufacturing an image pickup device having an antidust filter sealing the space which receives an image pickup element taking an image, comprising steps of
- preparing a birefringence plate transmitting light,
- forming said antidust filter by forming an insulation portion transmitting light and a first electrode and a second electrode transmitting light on said birefringence plate so that said first electrode and said second electrode sandwich said insulation portion along a direction parallel to an image pick up face of said image pickup element, and said first electrode, said second electrode and the insulation portion have the same main component, said first electrode and said second electrode have lower electric resistance with respect to said insulation portion;
- sealing the space which receives an image pickup element by said antidust filter;
- and
- connecting electrically said first electrode and said second electrode to an output circuit outputting voltage to said first electrode and said second electrode so as to change an electric field of a surface of said birefringence plate.
Dependencies are inferred from the claim text.