Electronic writing board
AssigneeSony Corporation
InventorsOsamu Majima, Koichiro Kakinuma, Tohru Naganuma, Makoto Ando
Life of this patent
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Abstract
A flexible electrostatic recording medium used in conjunction with an electronic blackboard includes a base layer composed of a synthetic resin, a conductive layer formed on the base layer, and a dielectric layer formed on the conductive layer by a thin transparent film, preferably of polyvinylidene fluoride, and adhered to the conductive layer by means of an adhesive.
Claims17
A flexible electrostatic recording medium capable of forming latent electrostatic images by the action of an electrotatic recording head thereon comprising:
- a flexible base layer composed of a synthetic resin,
- a flexible, electrically conductive layer formed on said base layer, and
- a flexible dielectric layer composed of polyvinylidene fluoride formed on said conductive layer.
A display apparatus comprising:
- a frame,
- sheet guides supported by said frame,
- a flexible sheet supported for movement by said sheet guides,
- a recording head arranged to contact a surface of said flexible sheet,
- a developing device for rendering visible a latent image formed on said flexible sheet by said recording head,
- said flexible sheet comprising a base layer of synthetic material, an electrically conductive layer formed on said base layer and a dielectric layer composed of polyvinylidene fluoride formed on said conductive layer.
An electronic blackboard having document display functions comprising:
- a first image reader for reading a document image and generating document image signals therefrom,
- a flexible blackboard sheet movable past said first image reader, said blackboard sheet comprising a base layer of synthetic resin, an electrically conductive layer formed on said base layer and a dielectric layer composed of polyvinylidene fluoride formed on said conductive layer,
- a second image reader for reading a blackboard image written on a surface of said blackboard sheet and generating blackboard image signals therefrom,
- a recording head for recording an electrostatic latent image on said surface of said blackboard sheet in response to said document image signals,
- a developing device for forming a visible image from said latent image on the surface of the blackboard sheet, and
- a printing device for making printed copies of said blackboard image signals.
Dependencies are inferred from the claim text.