Abstract: An image processing device is disclosed which can reliably detect documents which may not be copied, which has a very small probability of false positives, and which can handle newly issued documents which may not be copied. In addition, an image processing scheme is disclosed which would accurately obtain the location of a pattern indicating a document to be detected; which would extract that pattern; which would determine correctly whether it is the right pattern; and which would make it difficult for anyone to tamper with the pattern. To achieve this, a specified pattern is imprinted before use on a document which may not be copied, and a previously specified number of positioning marks and dummy marks which identify the location of the pattern may also be imprinted. The device is able to detect a wide variety of documents and perform the required processing at high speed.

Abstract: An image processing device is disclosed which can reliably detect documents which may not be copied, which has a very small probability of false positives, and which can handle newly issued documents which may not be copied. In addition, an image processing scheme is disclosed which would accurately obtain the location of a pattern indicating a document to be detected; which would extract that pattern; which would determine correctly whether it is the right pattern; and which would make it difficult for anyone to tamper with the pattern. To achieve this, a specified pattern is imprinted before use on a document which may not be copied, and a previously specified number of positioning marks and dummy marks which identify the location of the pattern may also be imprinted. The device is able to detect a wide variety of documents and perform the required processing at high speed.

Abstract: A device for processing optical data comprising:an optical waveguide formed on a substrate,a light source for the laser beam to be admitted into the waveguide,lens means provided on the waveguide for causing the beam propagating through the waveguide to emerge obliquely upward and focusing the emergent beam two-dimensionally,means for receiving the beam reflected obliquely from above,a base provided with the laser light source, the substrate and the light receiving means,a focusing drive mechanism for adjusting the position of the base upward or downward, anda tracking drive mechanism for adjusting the position of the base laterally.

Abstract: An optical deflector comprises a photo-conductive material having a temperature optical effect and formed with a propagation path for light which propagates in a predetermined direction, a heating and cooling member disposed on the surface of the light propagation path of the photo-conductive material and which effect heat generation operation for heating the photo-conductive material and endothermic operation for cooling the same to produce the distribution of refractive index corresponding to the temperature distribution formed by each operation, in the light propagation path, and a drive DC source to have the heating and cooling member effect the heat generation operation and endothermic operation.

Abstract: A device for processing optical data comprising:an optical waveguide formed on a substrate,a light source for the laser beam to be admitted into the waveguide,lens means provided on the waveguide for causing the beam propagating through the waveguide to emerge obliquely upward and focusing the emergent beam two-dimensionally,means for receiving the beam reflected obliquely from above,a base provided with the laser light source, the substrate and the light receiving means,a focusing drive mechanism for adjusting the position of the base upward or downward, anda tracking drive mechanism for adjusting the position of the base laterally.

Abstract: A method of making an optical waveguide. First ultraviolet light is radiated upon the surface of a transparent piece of photopolymerization material of a type whose refractive index is changed by the impact of ultraviolet light thereon, so that a refractive index profile in the depthwise direction of the piece of photopolymerization material is formed. Next ultraviolet light is radiated upon the surface of the transparent piece of photopolymerization material in a pattern of a lengthwise extending stripe whose intensity is least in its central portion and becomes greater towards its edge portions, so that a refractive index profile in the widthwise direction of the piece of photopolymerization material is formed. Finally an optical waveguide is structured from the thus irradiated piece of photopolymerization material. Optionally, these profiles may be parabolic profiles.