| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | Thermoremanent magnetic imaging method | EP84304564 | 1984-07-04 | EP0132334A3 | 1985-04-17 | Drews, Reinhold Eldor; Fisher, Almon Preston; Hermanson, Herman Alvin; Pond, Stephen Fullerton |
An energy-efficient thermoremanent magnetic imaging method and apparatus, comprising a moving magnetic record medium which is passed through a nip formed by a thermal printhead and a pressure roller, so that the magnetizable surface of the record medium is in pressure contact with the heating elements of the thermal printhead. The record medium is magnetized prior to entry to the nip, and passed through a magnetic field of lower strength and opposite polarity at the nip. Small areas or pixels of the pre-magnetized record medium are heated by the thermal printhead in image configuration and allowed to cool in the presence of the magnetic field at the nip. The magnetic poles of the imagewise pixels are switched, forming fringe fields between the pixels and pre-magnetized background areas. The pixels with the switched magnetic poles are spaced from each other to prevent the fringe fields from forming around the periphery of clusters of pixels and collapsing in between some or all of the pixels making up the cluster. |
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| 2 | Recording head for a magnetic printer | US291464 | 1994-08-17 | US5699088A | 1997-12-16 | Hitoshi Isono; Tetsuya Inui; Kenji Ohta; Junichiro Nakayama |
| 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. | ||||||
| 3 | Thermoremanent magnetic imaging method | US515720 | 1983-07-20 | US4531137A | 1985-07-23 | Reinhold E. Drews; Almon P. Fisher; Herman A. Hermanson; Stephen F. Pond |
| An energy efficient thermoremanent magnetic imaging method and apparatus comprising a moving magnetic recording medium which is passed through a nip formed by a thermal printhead and a pressure roller, so that the magnetizable surface of the recording medium is in pressure contact with the heating elements of the thermal printhead. The recording medium is pre-magnetized prior to entry in the nip and passed through a magnetic field of lower strength and opposite polarity at the nip. Small areas or pixels of the pre-magnetized recording medium are heated by the thermal printhead in image configuration and allowed to cool in the presence of the magnetic field at the nip. The magnetic poles of the imagewise pixels are switched, forming fringe fields between the pixels and pre-magnetized background areas. The pixels with the switched magnetic poles are spaced from each other to prevent the fringe fields from forming around the periphery of clusters of pixels and collapsing in between some or all of the pixels making up the cluster. | ||||||
| 4 | Magnetic recording medium | US376993 | 1982-05-11 | US4480258A | 1984-10-30 | Nobuo Nishimura; Teruhiko Itami; Toshifumi Kimoto; Koichi Saitoh |
| A magnetic recording medium for use in recording a magnetic latent image includes a high permeability layer having a low Curie point and a magnetic recording layer formed thereover. In use, the high permeability layer is selectively heated to the Curie point, so as to allow a magnetic signal to pass therethrough and be recorded on the recording layer. | ||||||
| 5 | Magnetic image recording device | US309343 | 1981-10-07 | US4458252A | 1984-07-03 | Yohsiki Kikuchi; Takashi Ohmori |
| In a magnetic image recording device, selected portions of a magnetized magnetic medium are heated to temperatures less than the Curie temperature of the medium to reduce the local magnetization intensity and form a magnetic latent image. If desired, the temperatures of different portions can be varied to produce a shaded image. | ||||||
| 6 | Self biasing thermal magneto-optic medium | US781618 | 1985-09-30 | US4649519A | 1987-03-10 | Shu S. Sun; Curt W. Laumann |
| A layer in a magnetic storage medium provides a biasing magnetic field for writing data. The layer exhibits a net magnetization with an orientation in a first direction when the layer is at a temperature below its compensation temperature and a net magnetization with an orientation in a second direction different from the first direction when heated as by a laser to a temperature above its compensation temperature, but below its Curie point temperature. | ||||||
| 7 | Thermo-magnetic recording method | US411129 | 1982-08-24 | US4599658A | 1986-07-08 | Koichi Saitoh; Teruhiko Itami; Toshifumi Kimoto; Nobuo Nishimura |
| A method of thermo-magnetic recording employs a recording medium of a magnetization material disposed on an insulator. An area on the medium is joule-heated via the application of a voltage across contacting electrodes up to a bias point, and a heat pattern is applied in the form of an image to form a magnetic latent image. | ||||||
| 8 | Thermomagnetic printer | US725518 | 1985-04-22 | US4554557A | 1985-11-19 | Toshifumi Kimoto; Hidemasa Todoh; Teruhiko Itami; Koichi Saitoh |
| A thermomagnetic printer includes a recording unit for storing a latent image in which there are provided a magnetic recording layer providing thermomagnetic effect when placed in magnetic field with temperature graduation on one side of a photoconductive layer and a transparent electrically conductive layer on the other side.When storing a latent image in the magnetic recording layer, light which emits corresponding to the image to be reproduced on a paper is irradiated onto the photoconductive layer through the transparent electrically conductive layer while applying magnetic field to the magnetic recording layer and supplying electricity between the magnetic recording layer and the electrically conductive layer, whereby irradiated part of the photoconductive layer and the corresponding part of the magnetic recording layer are heated by Joule heat effect and the latter is magnetized by the thermomagnetic effect. By repeating the above operation in accordance with the image information, the latent image is formed in the magnetic recording layer. | ||||||
| 9 | Method of erasing magnetic latent image in thermo-magnetic recording | US411187 | 1982-08-25 | US4503438A | 1985-03-05 | Koichi Saitoh; Teruhiko Itami; Toshifumi Kimoto |
| A method of erasing a magnetic latent image includes the steps of simultaneously applying an external magnetic field and heat to a thermally magnetized layer of a magnetic recording medium. | ||||||
| 10 | Image forming apparatus with vibration compensation | US335461 | 1981-12-29 | US4453170A | 1984-06-05 | Kozo Arao |
| In an image forming apparatus for recording information by scanning a movable photosensitive member with a light beam, the vibration of determined parts such as optical elements or photosensitive member is detected to activate a vibration forming device acting on said parts, thereby reducing fluctuation in the scanning pitch of the light beam on the photosensitive member in its moving direction. | ||||||
| 11 | Magnetic recording medium and magnetic recording method | US535116 | 1983-09-23 | US4734708A | 1988-03-29 | Koichi Saitoh; Teruhiko Itami; Toshifumi Kimoto; Kiyoshi Horie |
| In a magnetically recording and erasing the magnetic latent image on the magnetic recording medium, the magnetic recording medium includes a base layer, a first magnetic layer in which a repetitive magnetic pattern is in advance formed, and a second magnetic layer on which the magnetic latent image to be formed is thermo-magnetically formed. A method of erasing the magnetic latent image on the second magnetic layer includes the steps of simultaneously applying an external magnetic field and heat to be thermally magnetized layer of a magnetic recording medium. | ||||||
| 12 | Thermo-magnetic recording device | US928033 | 1986-11-07 | US4701768A | 1987-10-20 | Ryohei Komiya; Masaaki Terazawa |
| Is disclosed a thermo-magnetic recording device in which a magnetized latent image is produced on a magnetic layer which is initialized through unidirectional magnetization thereof, in the process of locally heating the magnetic layer. The thermo-magnetic recording device includes: (a) a heat generating roller for heating a local portion of the magnetic layer, through contact of an outer surface of the roller with the local portion of the magnetic layer; and (b) a magnetic-field generating device for generating, at the local portion of the magnetic layer, a magnetic field which has the same N-S direction as that of the unidirectional magnetization, and thereby initializing the magnetic layer. | ||||||
| 13 | Magnetic recording image developing apparatus | US867627 | 1986-05-27 | US4686933A | 1987-08-18 | Yoshihiko Fujimura; Koichi Saitoh; Yuji Suemitsu |
| An apparatus for developing a latent magnetic image on a moving magnetic recording medium in which the image is always satisfactorily developed without excess toner particles yet using a simple mechanism. A developing magnet extends parallel to the surface of the recording medium, which is in the form of a magnetic drum. The direction of the magnetic field produced by the magnet at the point (line) of closest approach of the recording medium and magnet is the same as the direction of the magnetic field at boundaries between background regions and recorded image regions on the magnetic recording medium. A nonmagnetic rotating sleeve is positioned around the development magnet, and magnetic toner supplied to the outer surface of the sleeve. | ||||||
| 14 | Magnetic recording medium | US617404 | 1984-06-05 | US4588995A | 1986-05-13 | Nobuo Nishimura; Teruhiko Itami; Toshifumi Kimoto; Koichi Saitoh |
| A magnetic recording medium for use in recording a magnetic latent image includes a high permeability layer having a low Curie point and a magnetic recording layer formed thereover. In use, the high permeability layer is selectively heated to the Curie point, so as to allow a magnetic signal to pass therethrough and be recorded on the recording layer. | ||||||
| 15 | Magnetizing apparatus for a magnetographic printer | US625285 | 1984-06-27 | US4543586A | 1985-09-24 | Delmer G. Parker |
| An energy efficient means for selectively pre-magnetizing a magnetic recording medium of a thermoremanent magnetographic printer is disclosed. It consists of a pair of axially aligned, elongated two-pole, substantially cylindrical permanent magnets separated by a narrow gap and oriented so that like poles of adjacent magnets confront one another across the gap. The recording medium moves between the magnets in a direction perpendicular to the magnets. The elongated magnets produce magnetic field components that are additive in the surface of the recording medium and that cancel in the direction normal to the recording medium's surface. The magnetizing field of the magnets may be turned off for latent image retention by rotating the magnets about 90 degrees. An alternate embodiment houses the magnets in a pair of fixed high permeability pole pieces which confront each other across a gap and act as high permeance conduits for the magnetic flux to create a strong pre-magnetizing field in the surface of the recording medium as it passes therethrough. Rotation of the magnets shunts the flux effectively eliminating any magnetic field from the region of the recording medium. | ||||||
| 16 | Magnetic recording head | US449940 | 1982-12-15 | US4525723A | 1985-06-25 | Nobuo Nishimura; Teruhiko Itami; Toshifumi Kimoto; Shunsuke Tomiyama; Koichi Saitoh |
| A thin film magnetic recording head and process for fabricating it is disclosed. The magnetic recording head has a core with a gap the same length as the width of an original document to be produced and is positioned in contact with a moving magnetic recording medium and perpendicular to the direction of movement thereof. A high magnetic permeable body is disposed in the gap of the head core and is in contact with the magnetic recording medium. A heat generation body of the same length as the high magnetic permeable body is positioned in contact therewith. Means for selectively heating segments of the heat generation body corresponding to the width of a picture element is provided. The portions of segments the high magnetic permeable body that are heated via the heat generation body segments, above its curie point are rendered non-magnetic forcing the magnetic flux generated in the core by an exciting coil external of this portion and into the magnetic recording medium, thus forming latent magnetic images in the recording medium. | ||||||
| 17 | Self biasing thermal magneto-optic medium | EP86110794.4 | 1986-08-05 | EP0217067B1 | 1990-03-28 | Sun, Shu Shen; Laumann, Curt William |
| 18 | Self biasing thermal magneto-optic medium | EP86110794 | 1986-08-05 | EP0217067A3 | 1988-07-06 | Sun, Shu Shen; Laumann, Curt William |
A layer in a magnetic storage medium provides a biasing magnetic field for writing data. The layer exhibits a net magnetization with an orientation in a first direction when the layer is at a temperature below its compensation temperature and a net magnetization with an orientation in a second direction different from the first direction when heated as by a laser to a temperature above its compensation temperature, but below its Curie point temperature. |
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| 19 | Self biasing thermal magneto-optic medium | EP86110794.4 | 1986-08-05 | EP0217067A2 | 1987-04-08 | Sun, Shu Shen; Laumann, Curt William |
A layer in a magnetic storage medium provides a biasing magnetic field for writing data. The layer exhibits a net magnetization with an orientation in a first direction when the layer is at a temperature below its compensation temperature and a net magnetization with an orientation in a second direction different from the first direction when heated as by a laser to a temperature above its compensation temperature, but below its Curie point temperature. |
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| 20 | Thermoremanent magnetic imaging method | EP84304564.2 | 1984-07-04 | EP0132334A2 | 1985-01-30 | Drews, Reinhold Eldor; Fisher, Almon Preston; Hermanson, Herman Alvin; Pond, Stephen Fullerton |
An energy-efficient thermoremanent magnetic imaging method and apparatus, comprising a moving magnetic record medium which is passed through a nip formed by a thermal printhead and a pressure roller, so that the magnetizable surface of the record medium is in pressure contact with the heating elements of the thermal printhead. The record medium is magnetized prior to entry to the nip, and passed through a magnetic field of lower strength and opposite polarity at the nip. Small areas or pixels of the pre-magnetized record medium are heated by the thermal printhead in image configuration and allowed to cool in the presence of the magnetic field at the nip. The magnetic poles of the imagewise pixels are switched, forming fringe fields between the pixels and pre-magnetized background areas. The pixels with the switched magnetic poles are spaced from each other to prevent the fringe fields from forming around the periphery of clusters of pixels and collapsing in between some or all of the pixels making up the cluster. |
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