By Replacement Patents (Class 369/172)
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Publication number: 20030156527Abstract: A tone arm assembly with an interchangeable tone arm tubes includes a fixed base. A support bracket is connected to the fixed base and rotatable thereon. A tone arm housing is mounted in the support bracket and rotatable therein. A separate straight tone arm tube and an S-shaped tone arm tube both have a connector at one end that is engageable with a connector on the tone arm base. The other ends of the tone arm tubes have another connector for removably attaching a cartridge thereto. The straight tone arm tube and the S-shaped tone arm tube are interchangeably connected to the tone arm housing via the respective connectors. Depending on the desired performance, on the same tone arm base, either the straight tone arm tube can be used for improved anti-skip performance or the S-shaped tone arm tube may be used for improved sound quality.Type: ApplicationFiled: February 11, 2003Publication date: August 21, 2003Inventor: Robert A. Warden
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Publication number: 20010022769Abstract: An optical recording medium comprising a recording layer containing ultrafine particles of a metal selected from the Group 8 and Group 1B elements, said particles having an average particle size of 1 nm to 50 nm, and surfaces thereof being modified with an adsorptive compound.Type: ApplicationFiled: March 19, 2001Publication date: September 20, 2001Inventors: Koukichi Waki, Yoshihisa Usami, Shingo Ishimaru
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Patent number: 4802081Abstract: A stereo phonograph pick-up head or cutter has a slim elongated construction utilizing an elongated mount having connector pins at its rear end. Two elongated pole pieces fit into the mount, each having a socket at its rear end. Each coil is wound around a long straight pole rod whose rear end fits into a respective socket and whose front end bounds the transducing gap. A screening shell, part of which forms a common pole piece, slides lengthwise over the holder, and is glued thereto. The stylus unit is slid over the front end of the screening shell, with the stylus magnetic element sliding between the screening shell and pole pieces into the transducing gap.Type: GrantFiled: July 25, 1983Date of Patent: January 31, 1989Assignee: U.S. Philips CorporationInventors: Willi Otzipka, Horst Koltermann, Michael Leipnitz, Gunter Zeuge
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Patent number: 4571717Abstract: An adapter for a phonographic tone arm for interchangeable mounting of a plug-in cartridge of a linear tracking arm to a head shell of an offset tone arm. The plug-in cartridge has a predetermined mass and center of gravity and has a plurality of small diameter contact pins projecting from the cartridge. The cartridge housing is secured to the head shell by the adapter which has a housing with a recess for accepting the cartridge. The adapter also includes a plurality of hollow terminal pins for receiving the contact pins of the plug-in cartridge. The predetermined mass and center of gravity for the plug-in cartridge enables attaining a predetermined tone arm balance without balance adjustment being necessary. The adapter housing also includes at least one groove for attenuating undesirable acoustic vibrations present in the tone arm.Type: GrantFiled: March 7, 1985Date of Patent: February 18, 1986Assignee: Kabushiki Kaisha Audio-TechnicaInventors: Kenneth Reichel, Frederick W. Nichols, III, Norm Levenstein
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Patent number: 4558443Abstract: An improved pickup cartridge of the kind including two moving coils is disclosed which is constructed such that a cantilever including a stylus tip at its foremost end is inclinably held by means of a damping rubber fixedly fitted into a longitudinally extending hole in a cartridge case which is preferably divided into two case halves and a pair of coils are wound about the cantilever which are located opposite to one another relative to the damper rubber disposed therebetween. An assembly of a magnet and yokes is fixedly held in the cartridge case so as to generate two magnetic fields which are directed at a right angle relative to one another, one of them being located corresponding to one of the coils and the other one being located corresponding to the other coil. Preferably, an assembly including the cantilever, the coils and the damper rubber is fitted into a sleeve and the latter is inserted in the longitudinally extending hole in the cartridge case.Type: GrantFiled: September 23, 1982Date of Patent: December 10, 1985Assignee: Tekudaiya Kabushiki KaishaInventors: Etsuo Koyama, Kazuhiro Nakamura
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Patent number: 4519063Abstract: A moving-coil type phono pickup cartridge in which undesirable resonances are eliminated and a vibrating unit is maintained in alignment with a predetermined center position of a magnet unit. A first non-magnetic body has a mount portion and a support portion extending perpendicularly to the mount portion. The support portion has a longitudinal hole formed therein which is intersected by a slit. A screw tightens and loosens a vibrating unit disposed in the hole by adjusting the gap width of the slit. A magnet unit is secured with a screw to the first body with a center pole piece thereof confronting a center of coils of the vibrating unit.Type: GrantFiled: June 29, 1981Date of Patent: May 21, 1985Assignee: Pioneer Electric CorporationInventors: Kazuo Nishikawa, Hiroyuki Ichino, Keniti Okura
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Patent number: 4437179Abstract: A moving coil type phono pickup cartridge in which a stylus unit is very accurately positioned in three dimensions with respect to a cartridge body to thereby closely align a moving coil unit in the stylus unit with a corresponding magnetic unit in the cartridge body. The stylus unit is formed with first through third resilient plates which project from a side of the stylus unit. The cartridge body is formed with corresponding first through third polished positioning surfaces having engagement recesses at the base portions thereof in which are engaged engagement projections formed at ends of the resilient plates. A tab formed on the stylus unit abuts an upper polished surface of the cartridge body.Type: GrantFiled: June 4, 1981Date of Patent: March 13, 1984Assignee: Pioneer Electronic CorporationInventors: Kazuo Nishikawa, Kiyoshi Sato, Hiroyuki Ichino, Keniti Okura
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Patent number: 4385375Abstract: An MC type phono cartridge which is simple in construction and easy to assemble and in which the stylus tip may be easily interchanged. The cartridge includes a pair of magnet units and an associated vibration unit. Included in the vibration unit is a cantilever with a stylus tip fixed to one end thereof with a disc-like member fixed to the other end of the cantilever. A string is attached at one end to the cantilever and at the other end to a string member holder which is in turn attached to the supporting member. A damper is disposed between a disc-like member and the supporting member. A pair of induction coils are disposed on the disc-like member. Each of the two magnet units includes a pair of adjacent magnets disposed with like magnetic poles confronting each other with the confronting portions of the magnets spaced from the induction coil at a preset gap. The vibration unit is detachable from the magnet unit for ease of stylus tip interchange.Type: GrantFiled: January 25, 1980Date of Patent: May 24, 1983Assignee: Pioneer Electronic CorporationInventors: Keniti Okura, Shinji Yasuda
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Patent number: 4342107Abstract: Pick-up needle having a cantilever lying in the longitudinal direction of the cartridge, which cantilever carries the tracking stylus point at one end and is coupled at a slight distance therefrom to an electro-mechanical transducer and is otherwise supported in a holding part which is held to the cartridge by a clamping device, and having guides for defining its feed movement relative to the cartridge upon change of the needle, namely in a direction which is first lengthwise of the cartridge and then transverse thereto.Type: GrantFiled: September 26, 1980Date of Patent: July 27, 1982Inventors: Heinrich Zimmermann, Jorg Schamberger
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Patent number: 4249747Abstract: A magnetic phonograph pick-up cartridge having a fixed assembly portion and a replaceable assembly portion wherein the replaceable portion includes self-contained, longitudinally-extending stylus pole pieces surrounding a pivotally mounted stylus magnet. One end portion of the magnet has a stylus-containing shank connected so that movement of the stylus by a phonograph record groove will cause a related pivotal movement of the magnet. The stylus pole pieces, which could include one or two pole piece pairs, are positioned to define a longitudinally extending pole gap. The magnet has a longitudinal dimension less than that of the pole pieces and is positioned within the pole gap. A resilient collar is attached to the stylus pole pieces and is used to pivotally mount the magnet so that movements of the stylus will alter the magnetic flux coupled from the magnet to the stylus pole pieces.Type: GrantFiled: July 30, 1979Date of Patent: February 10, 1981Inventors: Benjamin B. Bauer, deceased, by Ida Bauer, executrix