摘要:
A recording head for a magnetic printer utilizes a so-called magnetography, in which a magnetic latent image formed on a magnetic recording medium is developed and actualized by a magnetic toner and which image is transferred and fixed on a sheet of recording paper to provide a hard copy. The recording head for a magnetic printer includes a first thermal head member, second thermal head member juxtaposed with the first thermal head member with a space therebetween, and a magnetic head member arranged on the first and the second thermal head members. A magnetic gap of the magnetic head member extends immediately above the space between the first and the second thermal head members linearly in the same direction. By this structure, a recording head for a magnetic printer which has simple structure and allows formation of a magnetic latent image having clear boundary between opposite magnetic polarities on a magnetic recording medium, is provided.
摘要:
An optical memory disc medium contains a plurality of guide groove tracks. The guide groove tracks are arranged parallel to each other and they are used for controlling a position of a light beam. There is a land region between the guide groove tracks which is wider than the width of the guide groove tracks as measured in the disc-radial direction. Prepits for providing address information for the guide groove tracks are provided. The prepits are formed on the land regions and interposed between the lateral edges in the disc-radial direction of adjacent parallel guide groove tracks. Each prepit has a width which width is a narrower dimension than the width of each guide groove track as measured in the disc-radial direction.
摘要:
An ink jet head has an ink head main body that is constituted of a substrate, spacers that are formed on one side of the substrate, and a roof plate that is joined to the substrate through the spacers. One or more ink passages are independently formed between the substrate and the roof plate. Rows of piezoelectric devices, each of which is made of a plurality of piezoelectric devices aligned along each ink passage, are formed through the respective ink passages. Ac voltages whose phases are different from each other by 90 degrees are applied to the respective piezoelectric devices. Progressive waves, which are excited by the rows of piezoelectric devices, allow ink to move through the ink passage and to be sprayed.
摘要:
An information recording and reproducing apparatus of the present invention, in which a tunnel current is utilized for recording information to a recording surface of a recording medium and/or for reproducing information from the recording surface, includes a slider which is arranged on the recording surface and floats above the recording surface by an air flow caused by movement of the recording medium. The slider includes a body having a first surface positioned opposite to the recording surface, a second surface parallel to the first surface, and a third surface oblique to the first and second surfaces. The slider further includes a cantilever having a projecting portion projecting from the body so as to be substantially parallel to the recording surface and a tip for detecting the tunnel current formed on a surface of the projecting portion on the side of the recording surface.
摘要:
A method for manufacturing an optical memory element including the steps of disposing a resist film on a substrate, placing a photo-mask carrying a guide groove pattern on the resist film so as to position the photo-mask over a predetermined position of the substrate, forming a guide groove pattern latent image on the resist film, developing the guide groove pattern latent image formed on the resist film, conducting an etching operation through the developed guide groove pattern as to form guide grooves in the substrate, removing the resist film from the substrate, and disposing a recording medium layer on the substrate having the guide grooves formed therein.
摘要:
An optical disc includes a recording film formed on one surface of a disc-shaped plastics substrate having light transmission properties, and a coating film formed on the other surface of the substrate to which an optical beam is applied, in which the plastics substrate is made by injection molding and a barrier, such as a U-shaped annular groove or ridge, is circumferentially formed on the other surface, at a radial distance which is the distance from a center position to a joint position of an injection mold, and a method for manufacturing the same.
摘要:
A method of and a photomask for manufacturing an optical memory element. The manufacturing method includes the steps of: subjecting a positive type photoresist coated on a glass substrate to exposure by using the photomask capable of irradiating light onto a portion of the photoresist other than the remaining portion for forming pits of the glass substrate such that the portion of the photoresist is solubilized against developing solution; developing the photoresist by using the developing solution so as to remove the portion of the photoresist; and etching the glass substrate so as to directly form, as convex portions, the pits on a surface of the glass substrate.
摘要:
An optical memory device has grooves for guiding a light spot and pits for serving as track number indicators. The width W.sub.1 and depth d.sub.1 of the grooves and the width W.sub.2 and depth d.sub.2 of the pits are so selected that 2D(W.sub.1, d.sub.1)=1+D(W.sub.2, d.sub.2) where D(W.sub.1, d.sub.1) and D(W.sub.2, d.sub.2) are respectively the reflectivity of the groove and the pit.
摘要:
A photo-mask and a method of manufacturing a photo-mask, which includes the steps of applying a resist film onto a substrate of quartz, glass and the like, subjecting the resist film to light exposure and development to form a fine resist pattern, etching the mask substrate covered by the fine resist pattern causing a non-light transmitting thin film of Cr, Ta, etc. to adhere thereon by vapor deposition, sputtering and the like, and removing the thin film on the resist pattern together with the resist film, thereby to form the photo-mask.
摘要:
A method of and a photomask for manufacturing an optical memory element. The manufacturing method includes the steps of: subjecting a positive type photoresist coated on a glass substrate to exposure, by using the photomask capable of irradiating light onto a portion of the photoresist other than the remaining portion, for forming pits on the glass substrate such that the portion of the photoresist is solubilized against developing solution; developing the photoresist by using the developing solution so as to remove the portion of the photoresist; and etching the glass substrate so as to directly form, as convex portions, the pits on a surface of the glass substrate.