Patents Represented by Attorney, Agent or Law Firm Dike, Bronstein, Roberts & Cushman, Intellectual Property
Practice Group of Edwards & Angell, LLP
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Patent number: 6575459Abstract: A recording-medium transport device includes a pair of pinch rollers arranged closer to a printing head than to a subordinate roller and pinching and transporting a belt and a sheet of paper toward the printing head. The pair of pinch rollers can pinch the sheet of paper together with the belt, while maintaining the belt flat. As such, an image of high quality can be formed, e.g., printed on the recording medium. Furthermore, the recording medium does not divert from a transporting path. Thus reliable image formation can be achieved.Type: GrantFiled: June 9, 2000Date of Patent: June 10, 2003Assignee: Sharp Kabushiki KaishaInventors: Shigeaki Kakiwaki, Kaoru Higuchi, Len Ishikawa
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Patent number: 6556517Abstract: A magneto-optical head device includes a light source, an objective lens which condenses a light beam emitted from the light source, an auxiliary lens which converts an effective numerical aperture of the light beam condensed by the objective lens to irradiate a recording medium with the light beam, and a magnetic reproducing head which is integrated into the auxiliary lens. The magneto-optical head device can thus be decreased in size and information can be reproduced from both surfaces of a disk since the magnetic reproducing head is integrated into the auxiliary lens. Further, when a thermomagnetic recording medium is employed as the recording medium, the magneto-optical head device can reproduce information recorded at a high track density and a high line density.Type: GrantFiled: October 15, 1999Date of Patent: April 29, 2003Assignee: Sharp Kabushiki KaishaInventor: Junsaku Nakajima
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Patent number: 6521835Abstract: A cable raceway for carrying cables, e.g., fiber optic cables, across interior or exterior spaces is disclosed. The cable raceway includes a series of support channels and a plurality of main channels, each main channel being disposed in an overlaying relationship between successive pairs of support channels. An elongated slot is formed through end portions of the main channels, and bolts pass through spacers attached to the support channels and disposed in the elongated slots. The cable raceway also includes a plurality of covers set over respective channel members. Each cover includes a top portion; a pair of opposing sides extending downward perpendicularly from the top portion; and, a pair of steps formed on inner surfaces of respective sides adjacent to the top portion, thereby extending longitudinally along the length of the cover.Type: GrantFiled: June 14, 1999Date of Patent: February 18, 2003Assignee: K. & M. Realty TrustInventor: Karl A. Walsh
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Patent number: 6456571Abstract: A magneto-optical recording medium comprising a recording magnetic layer made of a perpendicularly magnetized film and a multilayer reproducing film, wherein the multilayer reproducing film has two reproducing magnetic layers which are in a in-plane magnetized state at room temperature and shift to a perpendicularly magnetized state with a rise in temperature and an in-panel magnetized layer disposed between the two reproducing magnetic layers, which is in an in-plane magnetized state from room temperature to a Curie temperature and has a lower Curie temperature than the recording magnetic layer and the reproducing magnetic layers.Type: GrantFiled: March 31, 2000Date of Patent: September 24, 2002Assignee: Sharp Kabushiki KaishaInventors: Junji Hirokane, Noboru Iwata
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Patent number: 6438089Abstract: In an optical pickup device, the numerical aperture (NA) of an objective lens is set at 0.7 or more, and the ellipticity of polarized light of a light beam which is incident upon the objective lens is set to be larger than (1.4×NA)−0.7. According to the structure, an optical pickup device which can prevent deterioration of the jitter and crosstalk characteristics, for example, due to oval deformation of a beam spot can be provided.Type: GrantFiled: May 17, 2000Date of Patent: August 20, 2002Assignee: Sharp Kabushiki KaishaInventors: Kazuya Kitamura, Yukio Kurata, Tetsuo Iwaki
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Patent number: 6400428Abstract: A display device of a multi-panel system is composed of plural liquid crystal panels which are jointed together by means of a bonding agent, and offers an image displayed on a large screen, wherein at least one edge portion of an end surface of a connected part of each liquid crystal panel is chamfered. According to the described arrangement, an internal stress generated by the curing shrinkage of the bonding agent at the chamfered portion is dispersed when joining the liquid crystal panels together, thereby preventing an occurrence of cracks at the edge portion. In this way, light scattering due to cracks at the joint between liquid crystal panels can be prevented. Accordingly, a liquid crystal display device of a large screen that offers excellent visibility in which a joint between liquid crystal panels does not stand out can be achieved.Type: GrantFiled: March 20, 1996Date of Patent: June 4, 2002Assignee: Sharp Kabushiki KaishaInventor: Yoshihiro Izumi
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Patent number: 6392965Abstract: An optical pickup device comprises a semiconductor laser, an optical system which converges light projected by the semiconductor laser onto an optical disk and directs reflected light from the optical disk to a photoreceptor element, and a photoreceptor element which detects the reflected light; the photoreceptor element including at least two main photoreceptive domains divided from one another by a dividing line, which receive reflected light corresponding to a focusing error of the light projected onto the optical disk, and at least one auxiliary photoreceptive domain which detects reflected light which exceeds the main photoreceptive domains in a defocused state; in which the auxiliary photoreceptive domain is provided adjacent to an end of said main photoreceptive domains in the direction of the dividing line.Type: GrantFiled: August 5, 1999Date of Patent: May 21, 2002Assignee: Sharp Kabushiki KaishaInventor: Tetsuo Ueyama
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Patent number: 6352765Abstract: A magneto-optical recording medium includes at least a first magnetic layer, a second magnetic layer and a third magnetic layer which are layered in this order, the first magnetic layer being formed of a perpendicularly magnetized film having a relatively small wall coercivity and a relatively large wall mobility compared with the third magnetic layer in the vicinity of a predetermined temperature, and the magneto-optical recording medium satisfies conditions Tc2<Tcomp1<Tc1 and Tc2<Tcomp1<Tc3 where Tcomp1 is a compensation temperature of the first magnetic layer, Tc1, Tc2 and Tc3 are Curie temperatures of the first, second and third magnetic layers, respectively.Type: GrantFiled: December 10, 1999Date of Patent: March 5, 2002Assignee: Sharp Kabushiki KaishaInventors: Noboru Iwata, Junji Hirokane
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Patent number: 6339422Abstract: A display control circuit of the present invention includes: a clock generator for generating a first clock signal having a single frequency; a frequency divider for dividing the frequency of the first clock signal generated by the clock generator, thereby providing a second clock signal; a selection signal generation section for generating a selection signal upon which one of a binary display mode and a gray-scale display mode is selected; a selector for selecting one of the first clock signal and the second clock signal based on the selection signal; and a display circuit for performing one of the binary display mode and the gray-scale display mode using the selected clock signal.Type: GrantFiled: October 28, 1998Date of Patent: January 15, 2002Assignee: Sharp Kabushiki KaishaInventors: Hidenori Kuwajima, Toshio Matsumoto
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Patent number: 6317280Abstract: A thermomagnetic recording and reproducing head includes a floating slider, and a heating head, a reproduction-use magnetic head as an MR head and a recording-use magnetic head as a thin-film inductive head mounted on the floating slider in this order from an upstream side of a track. The heating section of the heating head is formed by boron nitride or ruthenium oxide, and has a width narrower than the widths of the reproduction-use magnetic head and recording-use magnetic head. Moreover, the recording layer of a disk medium is made from an N-type ferrimagnetic material, the coercive force of the recording layer at a recording temperature and saturation magnetization thereof at a reproduction temperature are adjusted, and the compensation temperature of the recording layer is adjusted to be substantially room temperature.Type: GrantFiled: September 24, 1998Date of Patent: November 13, 2001Assignee: Sharp Kabushiki KaishaInventors: Junsaku Nakajima, Takeshi Yamaguchi
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Patent number: 6290358Abstract: A polarized-light converting elemental device which can produce an accurately unidirectionally and circularly polarized light with a minimized loss of light and a projection-type display device using said unidirectionally-polarized-light converting elemental device are provided. A polarized-light converting elemental device comprises a mirror glass portion consisting of an array of mirror glass blocks each having a first reflecting optical element and a second reflecting optical element and a cholesteric-liquid-crystal glass portion including a cholesteric liquid crystal layer for reflecting either clockwise circularly polarized component or anticlockwise circularly polarized component and transmitting the other.Type: GrantFiled: January 11, 2000Date of Patent: September 18, 2001Assignee: Sharp Kabushiki KaishaInventors: Yoshiharu Sakai, Kazuhiro Inoko
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Patent number: RE37932Abstract: A supermicrocellular foamed material and a method for producing such material, the material to be foamed such as a polymerplastic material, having a supercritical fluid, such as carbon dioxide in its supercritical state, introduced into the material to form a foamed fluid/material system having a plurality of cells distributed substantially throughout the material. Cell densities lying in a range from about 109 to about 1015 per cubic centimeter of the material can be achieved with the average cell sizes being at least less than 2.0 microns and preferably in a range from about 0.1 micron to about 1.0 micron.Type: GrantFiled: August 2, 1996Date of Patent: December 10, 2002Assignee: Massachusetts Institute of TechnologyInventors: Daniel F. Baldwin, Nam P. Suh, Chul B. Park, Sung W. Cha