Electro optical imaging device
AssigneeYeda Research and Development Co. Ltd.
InventorsBruce D. Sollish, Ephraim H. Frei
Life of this patent
Estimating the term…
Abstract
The present invention relates to an electro-optical imaging device containing as transducer a foil electret, having a transparent conducting backplate.
Claims12
In an acoustic-to-optical imaging device having a transducer responsive to an acoustic beam applied to one surface thereof and means for producing a viewable image, the improvement comprising as the transducer therein a foil electret, having an optically transparent conducting backplate as one of its electrodes and a second electrode.
In an acoustic-to-optical imaging device having a transducer responsive to an acoustic beam applied to one surface thereof and means for producing a viewable image, the improvement comprising as the transducer therein an unpolarized dielectric foil electret having an optically transparent conducting backplate as one of its electrodes, a second electrode, and means for applying a d.c. bias voltage across said first and second electrodes.
A method of providing an optical image comprising:
- positioning a foil electret having an optically transparent conducting backplate in vicinity of possible targets to be imaged;
- illuminating one surface of said electret with a coherent light beam;
- illuminating a surface of said electret opposite said one surface with an acoustic beam;
- and
- developing an image from light reflected from said one surface.
A method of providing an optical image comprising:
- positioning an unpolarized dielectric foil having an optically transparent conducting backplate in the vicinity of possible targets to be imaged;
- supplying a d.c. voltage to said foil;
- illuminating one surface of said dielectric foil with a coherent light beam;
- illuminating a surface of said dielectric foil opposite said one surface with an acoustic beam;
- and
- developing an image from light reflected from said one surface.
Dependencies are inferred from the claim text.