Camera with electrostatic light valve that functions as diaphragm
First Claim
1. A camera comprising an objective lens for forming an image of a subject by focusing rays of light at a film plane, and a diaphragm for forming a variable size aperture for said lens that changes the amount of light from said lens, is characterized in that:
- said diaphragm has a series of coilable light valves constructed to curl into respective coils and to uncurl from said coils to change the size of said aperture.
2 Assignments
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Accused Products
Abstract
The diaphragm for an objective lens in a camera includes a circular series of coilable resilient opaque electrodes that are biased to curl into respective coils radially outward to make the size of an aperture larger and are electrostatically actuatable to uncurl from the coils radially inward to make the size of the aperture smaller, a transparent flat stationary electrode that is positioned parallel to the coilable electrodes when the coilable electrodes are uncurled from the coils, a peripheral conductor that encircles the coilable electrodes and has respective conductive connections to each one of the coilable electrodes, and one conductive lead attached to the peripheral conductor and another conductive lead attached to the stationary electrode for together applying an electric potential between the coilable electrodes and the stationary electrode to electrostatically actuate the coilable electrodes to uncurl.
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Citations
14 Claims
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1. A camera comprising an objective lens for forming an image of a subject by focusing rays of light at a film plane, and a diaphragm for forming a variable size aperture for said lens that changes the amount of light from said lens, is characterized in that:
said diaphragm has a series of coilable light valves constructed to curl into respective coils and to uncurl from said coils to change the size of said aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method in a camera of adjusting a diaphragm to vary the size of an aperture for an objective lens, in order to change the amount of light that can pass through the objective lens, is characterized by the steps of:
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curling a series of coilable light valves into respective coils to make the size of the aperture larger so that more light can pass through the objective lens; and
uncurling the coilable light valves from the coils to make the size of the aperture smaller so that less light can pass through the objective lens. - View Dependent Claims (12)
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13. A camera comprising an objective lens for forming an image of a subject by focusing rays of light, and a diaphragm for forming a variable size aperture for said lens that changes the amount of light from said lens, is characterized in that:
said diaphragm includes a circular series of coilable resilient opaque electrodes that are biased to curl into respective coils radially outward to make the size of said aperture larger and are electrostatically actuatable to uncurl from said coils radially inward to make the size of said aperture smaller, a transparent flat stationary electrode that is positioned parallel to said coilable electrodes when the coilable electrodes are uncurled from said coils, a peripheral conductor that encircles said coilable electrodes and has respective conductive connections to each one of said coilable electrodes, and one conductive lead attached to said peripheral conductor and another conductive lead attached to said stationary electrode for together applying an electric potential between said coilable electrodes and said stationary electrode to electrostatically actuate the coilable electrodes to uncurl.
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14. A camera comprising an objective lens for forming an image of a subject by focusing rays of light at a film plane, and a diaphragm for forming a variable size aperture for said lens that changes the amount of light from said lens, is characterized in that:
said diaphragm includes a transparent flat stationary electrode that is positioned parallel to said film plane, and a circular series of coilable resilient opaque electrodes each one of which is tapered from an outer end fixed with respect to said stationary electrode to a inner free end that is movable to vary the size of said aperture.
Specification