"Phonograph or Speaking machine (as it stands on drawing, but patent front page titled ""Improvement in Phonograph or Speaking Machines""). His other patents on phonograph: 201760(Speaking Machine), 227679(Phonograph), 386974(Mechanical improvement with motor), 400650 (Collapsible Blank), 414761(Wax Blank), 430278(cutting edge and reproducing stylus), 430277, 437425, 437497, 453741, 454941, 484583(Cutting-Tool), 499879, 500208(Magnetic damping of cantilever), 513095, 605667, 652457, 655480 etc."
Recording and Reproducing Speech and other Sounds. Disk with spiral groove type ""phonogram"", but commercial embodied model was wax cylinder type ""Graphophone"" see 341288 invented by Tainter. Also 341212,341287(magnetic disk recording), 374133(paper cylinder), 375579, 380535, 385886, 385887(Graphophonic Tablet), 421450, 428646, 506348. "
Gramophone (Disk). His older patent 372786(1887) for Gramophone (horizontal recording) was cylinder type. Disk type Gramophone was invented by W. Suess: US Patent No.427279(1890) and assigned to Emile Berliner though Berliner in 382790(1888) already proposed solid resisting material (wax) coated on plate or cylinder. Also 548623, 564586, 637196, 637197, 689349 etc"
"Sound Recording and Reproducing Machine. Also 624625, 655556, 951127 about sound-box. Johnson was founder of Consolidated Talking Machine Company in 1900 which became Victor Talking Machine Company in 1901. Victor Talking Machine Company was created by merger and reorganization of two existing companies: Emile Berliner's Berliner Gramophone Company, which produced disc records, and Johnson's Consolidated Talking Machine Company, which produced machines for playing disc records."
The International Phonograph & Indestructable Record Company in UK.
"Method of forming metal matrices and duplicating Sound-Record Cylinders [by Electrodepositing metal on master record]. Also 657956, 666,937 & 750119 about celluloid cylinder. Ademor Napoleon Petit worked also for Edison."
"Stylus or Needle for Sound-reproducers. Long life needle made of hard small diameter rod core surrounded by or embedded in soft material. In 1915 Emerson started Emerson Phonograph Company for producing his label ""Emerson Record"". "
"Sound-Recording Apparatus. Cutting tool for lateral-cut groove of uniform depth consists of spoon-formed cutting stylus, advance pin (to regulate the depth of groove to be cut) and air-blast nozzle (contrary to modern suction nozzle). Basic recording method is almost established in this mechanical (sound-box) recording era."
"Production of Quasi-Original Sound Records (duplication of matrix for lateral-cut disks). Also 785316 about unique duplicating method: recording on inner wall of cylinder and ""nurling""=knurling blank cylinder by rolling reversal matrix."
"Die-Plate for Stamping up Sound Records. Cheny invented 655195(1900): Gramophone Sound-Box for The National Gramophone Compnay in New York. In another patent 915936(1909), Cheney proposed unique groove and forked stylus to trace two V grooves at once (sound is recorded at land). "
Record for Talking Machine. Lateral cut record with new groove configulations (the walls of groove merging smoothly into the surface of the record). Also 1246652 about cutting tool for sound-recording machines.
"Phonograph-Reproducer. Sound Box usable for both vertical & lateral records: projecting arm linked to stylus arm. Also 1324643:Adjustable Sound Box. Capps invented 570378-1896 (Spring Motor) for The National Phonograph Company, 727921-1903(Automatic Sound Recorder) & 783420 for American Graphophone Company, 1836153-1931(Stylus Holder) for Columbia Phonograph Company, 2187512-1940 (cutting stylus) etc. Almost 50 years engaged in recording industry from the beginning."
"Method of making record tablets. Various groove configurations seeking for standardization of lateral recording [the method of reforming any metal master record after recording is indicated: lapping, brushing, polishing, burnishing the surface of master or reforming the sharp corner of groove by spinning stylus in order to reduce pinch effect]."
Acoustical Device (cylinder record cutting & reproducing). Dictaphone started as producer of dictation machine esp. for recording telephone and later produced various machines in timely formats (wax cylinder/plastic belt/magnetic tape etc).
Electric Phonograph Circuit (Phonographs in connection with radio receiving circuits) Also 1957512 Reproducer with superaudible frequency: Weinberger proposed grooves with high frequency carrier of AM for broadcasting phonograph playback sound directly.
"Phonograph Recording and Reproducting (Application filed Nov. 15, 1919). The methods of reducing noises (by pre-emphasis on recording) or distortions (by compensation with opposite distortion on recording or reduroducing) are indicated. Also 1661793 & 1685913 "
"Talking Machine-Record. Apparatus for transfering sound from cylinder record to disc record. ""It is known that a record upon wax cylinder gives in some respects more faithful reproduction of the recorded sounds than a record cut upon a disc, and the proposal has been made..to transfer...from the cylinder to a disc...From the wax disc a matrix is made in the usual or any suitable way and from the matrix a number of records can be pressed."""
"Reproducer. Also 1614133 In 1925 E.dward W. Kellog and Chester Rice developed coil-driven (dynamic) paper-cone speaker. Later when GE transferred their radio and allied work to RCA, Dr. Kellog also went to RCA."
Electromagnetic Instrument (esp. pick-up for vertical-cut of the finely grooved type) Also 1804961, 1958386(pick-up for lateral-cut & vertical-cut record), 1980888 & 1992727 etc. 1992727 was assigned to ATT. His early patents: 1595978(1926) & 1745776(1930) about pickup switchable between mechanical diaphragm (Sound Box) & electrical pickup, 1598895 & 1630642 about electric reproducer, 1625918 about Electric Pronograph, 1656712 phonograph connected to telephone receiver. 2031865-1936 (System and apparatus for recording and reproducing sound) was assigned to RCA."
"Sound Reproducer (for playing soft wax records). Jones invented 1746730, 1812634, 1918972 etc about Reproducer for hill-and-dale records. 1531252(1925) Electric Reproducer assigned to Wired Radio Inc."
"Electromagnetic Device. ""a four-pole magnetic structure and coil are sealed in an oil filled casing by a flexible diaphragm. T-shaped armature supported by the diaphragm vibrate with it as the stylus flexes the diaphragm about its diameter"". "
Production of Phonograph Styli (lapping machine for making diamond stylus of small radius). There is description about vertical-cut fine groove (for example 450 threads per radial inch). The minute record groove was first experimented around 1930 for vertical-cut records.
Magnet System for converting electrical into mechanical energy or inversely [Laminated pole pieces]. Another patent 2108275(1938) by Roelof Vermeulen and Arend Thomas was assigned to Philips in Netherlands
Record (composition: copolymer of vinyl chloride and vinyl acetate etc). In 1920 Union Carbide established Carbide and Carbon Chemicals Corporation. Also refer to 2335986(1943 Vinyl Resin Phonograph Record). 1956837(1934) by Schmidt indicated application of Polyvinyl Alcohol-Aldehyde Condensation on record. 1997489(1935) by Hermann etc in Germany indicated various examples of polymerized vinyl alcohols.
"Vibration Translating Device (single moving coil) for hill-and-dale-recording. Also 1990548, 2038216 about the support of recording head by stream of air instead of ""advance ball"" since ""the mechanical disturbances caused by the advance ball as it slides over the wax is now audible in finished records and often predominant in original recordings""."
Feed Mechanism for disk recording machines. Later patents 2200866, RE22183, 2213936, 2222342, 2239042, 2250242, 2354558, 2357033, 2369087, 2369088(Equalising), 2441651(Recording Head), 2464064 etc were assigned to the Sound Scriber Corporation. Early patent 1637165(1927) was assigned to The Bristol Company."
"Photoelectric Phonograph. Also 2316113, 2359808 & 2399585 by Thompson and 2348660 by Stephan. Similar method was already shown in 1578645(1926) assigned to Western Electric, 1768273(1930) assigned to Bell Telephone Laboratories, 1793403(1931), 2063225, 2088960, 2191026 etc."
Sound Translating System. Also 2379707: Audio-Frequency Compensator Circuit in consideration of high frequency loss due to groove radius: High frequency boosted in inner groove radius and reduced in outer groove radius to obtain flat response. [Inner start & 33.3rpm transcription disk]
"Stylus for Reproducers. Also 2160793, RE22371,2261616, 2313324 & 2348526 about crystal pickups, 2222552&2346733 about Tone Arm, 2145389 about Arm and pickup, 2197967 about Sound Reproducing Apparatus (Arm coupled with pickup and amplifier circuit), 2379282&2412718 Recorder."
"Signal Recording and Reproducing System: compensating the loss of high frequencies due to groove radius [Inner start & 33.3rpm transcription disk]. Also 2311385 (combination of hill-and-dale operation and lateral operation is made possible by switching connection on transformer), 2280763 (phonograph apparatus, piezoelectric pickup with cantilever+stylus made from tungsten wire)"
"Electromechanical Conversion-Device (Improved Reproducer). Also 2239717 etc. Frederick Vinton Hunt (1905-1972), a professor at Harvard University about acoustics, wrote together with his colleague J.A. Pierce: ""On Distortsion in Sound Reproduction from Phonograph Records"" J.A.S.A 1938, a monument paper simulating various phonograph distortions. W. D. Lewis and F. V. Hunt, ""A Theory of Tracing Distortion from Phonograph Records,"" J.A.S.A. 1941. These researches led to the development of criteria that eventually made possible the long-playing record."
Phonograph Pickup (MC type similar to cutter head) with peculiar suspension suitable for lateral & hill-and-dale movements. Also 2386089. 2410329(1946) with powdered iron core by Albright is also related to this pickup.
"Cutting, Grinding or Polishing Machine for Diamonds or other stones and the like (showing machine tool for making elliptic tip). Also see 671830-1901 & 835964-1906 by Loesser about Machine for Sawing Diamonds"
"Sound Recording and Reproducing Machine. AUDOGRAPH is recording from inner to outer with constant groove speed like CD using soft vinyl disc sandwitched between two wheels. Also related patents 2410607, 2563860, 2628842& 2740633 etc."
"Hum-less Electrodynamic Pickup (lateral MC pickup) Also 2542457. Newspaper ""The Tech"" dated February 7, 1950 titled ""Churchill Repairs English Language""indicating Churchill's misuse of ""me"" instead of ""I"" reports that Winston Churchill dictates his memoirs on the dictating machine of the Sound Scriber."
Stylus Construction and Method (Embossing sound track). Related patent 2534735(1950). Yerkovich's patent 2318828 (Phonograph) assigned to Dictaphone shows full details of dictaing machine using a loop of acetate film.
Phonograph pickup with mechanical filter. Also 2531689: Electrical Translating Means and Variable-Inductor Transducer Therefor. Pickup Signal transmitted by antena and received by radio receiver - there was such trend since Philco also obtain similar patent 2441464(1948) from Albright.
"Electrodynamic Phonograph Pickup (one turn of coil=ribbon type?) In 1945, the Crosley interests were purchased by Aviation Corporation. The radio and appliance manufacturing arm changed its name to Avco, but the broadcast operations continued to operate under the Crosley name, until they adopted the Avco name in 1968."
Phonograph Pickups (Piezoelectric). The Brush Development Company in Cleveland was engaged in applying piezoelectric device on underwater acoustics during 2nd World War. German-born Semi Joseph Begun invented piezoelectric pickup(2363497etc) & magnetic recorders(2048487&2048488) etc for this company.
Dual Stylus Phonograph Pickup for Multispeed Record Players. Also 2554208 about improvement of cantilever. 2748199, 2776342, 2820853, 3047676 & 3088000 by Dally. 2572712 by Fisher. Slide-in type 2820854 by Woodworth.
Moving-Coil Phonograph Pickup. Coil is wound vertically on elongated core which is supported with dampers on vertical axis. Coil windings and pivot were modified later by Anneberg etc as per GB700155(1953) & DE873757. There was rare stereo modification model: the cantilever has been fixed at a cube for special Cardanic transmission 'cross- coupler' which converts stylus deflection to channel-separated rotary motion.
"Phonograph Pickup Mounting (proposing Inclined Arm Mounting for anti-skating: ""Since the tracking instability is greatest for the outmost sound groove, it is advantegeous to tilt the axis of rotation in a direction lateral of the arm in the position in which the arm engages the maximum diameter sound groove for which the phonograph is designed."") "
"Mechanical Coupling Device (Pickup Cartridge using bimorph piezoelectric plates) Also 2771514, 3089922. Related patents 2938966 by Spencer and 3067296 by Heinlein about piezoelectric element for stereophonic cartridge."
Phonograph Stylus (universal tip applicable for both coarse & fine grooves) Similar idea was already presented by Graupner and Gullner in Germany (German Patent 885163-1953: Universal-Doppelnadeln fuer normale und Microrillen-Schallplatten)
Pickup Heads (moving-conductor type called also as ribbon type). This idea is not new (for example 1916162-1933 invented by Parker and assigned to Pacent Electric Company used U-shape copper strip as armature).
Method of manufacturing phonograph styli (special shape of shank base suitable for bonding diamond tips). His another patent 2992007(1961) about titanium shank for bonding a diamond tip with solder bond of granulated nickel.
"Off-Center Indicator [to check the concentricity of phonograph records and metal phonograph stampers]. In producing a stamper, the center hole is obliterated during the plating process: necessary to punch a center hole in each stamper anew. "
"Method of manufacturing phonograph records (""microfusion"" method using pulverised resin instead of pre-mixed lump/biscuit/cake). His binaural records with two concentric grooves were produced in 1951- but similar was already invented by Dolittle of RCA (1817177 & 2126370) etc."
Tone Arm Suspension and Balancing System. RA-498 by Stromberg-Carlson utilized viscous damping material in the trough of arm pivot suspension (forerunner to Decca/Keith Monks). His another patent No. 3025066 for Turntable PR-499
"MC cartridges (Stereophonic & Monophonic). Vertical coil assembly in his another patent 3018336(1962) resembled to Ortofon Type A(2591996-1952) while this new patent had ""cross coils"" wound on a plastic cubic bobbin (magnetic? plug inside). "
"Gramophone Pickups (Arm very similar to later patent 3167317 by Percy Wilson). John Walton worked also for The Decca Record Company in England and reported many articles to AES during '60 about ""stylus mass and elliptical points"" etc."
Phonograph Pickup Cartridge: Sample of Variable Reluctance type cartridge with unique suspension. He invented capacity pickup and assigned many patents (2397888 &2417712& 2426061etc) to RCA. He worked also for CBS 1944-1957.
Stereophonic MM (ELAC engineers in Kiel got German patent No. 1 105 628 in 1957 and its US patent was assigned to Shure). Also 3463889(1969) for Streophonic cartridge with detailed drawing about yoke-construction
"Tone Arm. Percy Wilson as the technical editor of the Gramophone wrote ""Needle-Track Alignment"" in 1924 and also designed record cleaning machine (based on which Loricraft etc made commercial models)."
"Phonograph pickup with resiliently loaded stylus beam (piezoelectric element is inherently stiff and heavy, hence beam is designed to have reduced mechanical impedance for better performance) Also 3102171"
"Piezoresistive Transducer. Also 3501732: Semiconductive Piezoresistive Transducer. Engineers (Wood and Grover) of Euphonics Corporation reported in AES Convention (Oct.1965):""In October of 1964 Euphonics Corporation announced the development of a new phonograph transducer utilizing ... Since the development of this silicon fiber by Endevco Corporation, several years of rigorious testing and use in the ..."" Later (1976) cartridge SDT-10 by Win Laboratories follows similar system. "
"Pickup Arm. Anti-skating mechanism by cam and lever with spring. Also 3492006 about the location of Lateral Balance Weight. Mr. Seisuke Shimoda from Toho Machine Co., Ltd which has been engaged in precision machining since 1947."
"Dynamic Mechanism having a damper. Also 3142786(patented 1964, applied 1960) about round coil of aluminum ribbon wire (10x100microns) for MC cartridges [later models since M6-45 are said to have triangle coils]"
Recording Method and Apparatus for compensating third order distortions. Tracing Simulator for 3rd harmonic distortion in addition to previous method (2nd harmonic distortion compensating upon recording).
Elliptical Phonograph Stylus 0.7x0.2mil (forerunner to Van den Hul type with constant radius of curvature=edge. Included angle 60-65degrees and arcuate chord distance 0.9mil of radius 0.7mil for bottom in this patent)
"Linear Tracking Arm with servo-drive on spring suspension. In 1968 Rabinow formed the RABCO company to manufacture straight-line phonographs, and the company was later bought out by Harman-Kardon Corporation. His other patents 2915315(1959), 3129946, 3249361, 3249362, 3356372, 3390886, 3675932 etc."
New armature assembly for MM: disc-shaped magnet of platinum-cobalt alloy. A pipe of magnetic conductor is provided to reinforce the coupling between stylus arm and the magnet and at the same time to increase equivalently the length of magnet and increase the magnetic moment of the magnet under vibration.
"Discrete 4 Channel Recording/Reproducing System. Preceding Patent 3401237(1968):""Simultaneous Recording of Two Signals per Channel"" invented by Kenjiro TAKAYANAGI (famous inventor of TV in Japan) and assigned to JVC. Additional patent 3883699(1975) for system and 4033592(1977) for special cutting stylus."
Stylus Tip (Shibata type) Suitable for 4 channel reproduction. Its line contact profile (a curve of large radius of curvature in its parts in contact with a record groove in a vertical section) is easy to be obtained: two planes cut off from cone.
Cartridge shell for phonograph pickup. Carbon-clad shell is based on another patent 3957272 invented by Yasuda ans assigned to Sony: ""the carbonaceous fibers bonded together by a synthetic resin and secured to a metal cover plate by a suitable adhesive or by a heat-press.
Magnetic Cartridge. Magnetic rod within cantilever pipe, main magnet axial at the end of poles, other two magnets for flux balancing at side. Unique double dampers: cantilever suspension and inner magnet piece suspension inside cantilever.
"Methods and devices for recording, engraving and reproducing modulated information in tetraphony: 2separate grooves 4 channels. His other patents 2437997,2458346,2488763&2506441about cinematograph and condensor. 1904408(1933) about Needle Securing Device for Talking Machine"
"Cueing control. Dwipendra Nath Guha invented also 3949995(needle control-unique dynamic arm with two springs for side and down forces) & 4004816(programmer for record player) for Avnet, Inc in New York.. AVNET, the owner of importer ""British Industies Corp."" (B-I-C) needed their own products since Plessey of England (parent company of Garrard in this era) set up their own distribution of Garrard products in USA. Related patent 3973778 for belt-drive turntable assigned to Avnet."
Flat DD Motor: a plurality of magnets provided on the inner surface of the turntable so as to be disposed in a state alternately opposite in polarity and a plurality of coils provided on a stationary substrate disposed to face said turntable to have an increased driving torque - see Fig.10
"Multi-directional sound signal recording and/or reproducing system with crosstalk compensation means. Also 3985978. Improved discrete 4 channel system named as UM system=UMX:""UNIVERSAL MATRIX""system compatible to CD-4, RM and SQ/QS and regular stereophonic disks for reproducing 4 channels. "
Apparatus for the manufacture of disc records. Automated record press incorporated with trimming the flash around the edge of the disc. This contains good reference to previous patents in LP era. Also 4141538 for disc record press
"Auto changer. See also patent 3827697-1974 (reissue RE29730-1978) invented by Miyoshi about record player operating ""six cycles by rotating the index wheel until the number ""6"" appears on the viewing window"". "
"Pickup cartridge called as ""Moving Flux""(see also 4011417). Unique construction having merit of MM/IM/MC. Also see Design patent D266504(1982) assigned to The Astatic Corporation (cartridge model MF200). Also 4123067 about unique stylus pivot suspension (embodied in model G-7 cartridge)"
MC Cartridge: coils are wound in such a manner that the electric potentials generated in diametrically opposite coils are added together. Also related patent No. 4410975(1983) about improved damper with grooves for better separation between channels.
Playback stylus for phonograph record stamper. Related patent 4153257 is for a turntable to enable playback of record matrices and stampers. The turntable rotates in the direction opposite that of a conventional turntable and is provided with a tone arm carrying a stylus designed to ride the ridges of the stamper. Also 4113267 invented by Wittenberg and assigned to Pickering
"A device for damping vibrations of a tone arm. Eddy current damper and dynamic mechanical damper are applied on the main arm of DV-505 while additional eddy current damper for sub arm as indicated in Fig. 9 & 10 is omitted from actual models. Dr. Tominari (deceased in 2002) was professor in Tokyo Metropolitan University [servo technology], established Dynavector in 1977, also developing fuel injection for MIKUNI (carburetor maker) in Japan."
Two moving coils. Actual embodiment is modified from this patent: first embodiment AT34 with 180degrees reverse location of coils while later models have V shape bobbins connected to the end of cantilever similar to their VM type.
Phonograph turntable control system (for auto player incorporating electronic anti-skating etc). Also 4158459 for the arm weight device to provide a low profile pick-up arm. Also 4266783:Control mechanisms for pick-up arms of record players
MC cartridges with improved damper construction. Also 4220341(Pickup) & 4145582(MC cartridge with square magnetic armature) Nakatsuka visited Ortofon around 1976 and assisted in development of MC20 etc.
"Phonograph cartridge replaceable stylus assembly. ""The tube is crimped along a circular crimp line engaging the damper intermediate the forward and rear edges with the portions of the damper that do not engage the crimp also being free of the tube""."
Compact MC Cartridge without magnet pole in front of coils which are driven by coaxial ring magnet. Any yoke for producing parallel magnetic field as in the prior art is not required and the pickup can be constructed quite compactly in the cantilever support member.
"Pickup cartridge with sealing damper (called as ""tip damper"") to prevent entry of foreign matters such as moisture or dust into the cartridge casing. Electret condenser-type cartridge CP-Y is shown in Fig.1 though document refers to CP-X Condenser Pickup Cartridge. "
Automatic (programmable) record player. This idea (nonrecorded section detection sensor =LED+optical sensor mounted on arm head) might be developed from earlier US Patent 4226425: Nonrecorded section detection in an automatic record. US Design Patent D265196-1982 shows RP-7100 with small modification.
"Compact moving-coil pickup of low weight and high quality [square moving coil and ring magnet]. Also 4310917 about damping device consisting of a disc shaped inertia body clamped between two rubber pads - named by Ortofon as ""Wide Range Damping"" system."
"Tone arm: A viscous dynamic damping subassembly is designed to eliminate the main resonance frequency of the tone arm and includes a hollow casing rigidly affixed to the lever. ""Korvet""arm by A. Likhnitsky is related to this patent."
"Tone Arm. ""The suspension of the tone arm is of the dual-bearing type where the vertical movement of the arm takes place around two bearings, characterized in that the mid-point between said bearings is placed eccentrically with respect to the center of gravity of the said separate element/s and which bearings are attached on one side to the said element/s, and between said two bearings a vertical pin, which is also attached to said elements, is positioned and in combination being surrounded by damping fluid in a well that is positioned in the non moveable part of the tone arm in the said cavity, surrounded by the element/s, and on their other side the above two bearings are attached to bearings or just one bearing comprising the horizontal movement of the tone arm""."
"Arm pipe for record player tonearms (a composite material consisting of a thermoplastic resin and graphite powder). Also 4269416: Head shell for record player tonearms (a composite material consisting of a thermoplastic resin and graphite powder)
"Linear-Tracking Pickup Arm Drive Assembly. A linear motor dictect-drive arm on two guide bars. Its unique jog dial ""REMOTE OPERATION/CONTROL KNOB"" was based on previous patents such as 4118039/4147365. Linear motor drive was shown also by Sony patent 4322840 (no embodiment?)"
Stereo phonograph cartridge. The elements were made of the piezoelectric material though quoted as electrets in commercial documents - maybe it is reasonable since its electrical equivalent circuit is similar to capacitance load. Also 4320492:Variable weight phonograph cartridge
"Precision phonocartridge interface (measuring and tuning adaptor between arm cable and phonoamp) In 1972, at a meeting in Europe, eight people representing companies in the USA, UK, France, Switzerland and Germany formed a HiFi company soon to be known as NAD (New Acoustic Dimension). "
Cartridge Equalizr. Dynamic Lateral Balancer to be equipped additionally on the shell neck - funniest patent I ever see. It is based on the theory presented by Iyeta: US Patent 4113265: Tone pickup arm device keeping excellent dynamic lateral balance and damping effect.
"Vertical tracking angle meter: Measuring instrument which extracts and directly displays the vertical tracking angle of a phonograph pickup during playback of a known test record signal, and which also has the capability of measuring and directly displaying tracing distortion"
"Passivating and silver removal method [in the processes of making Mother]. The term to ""passivate"" means to treat a metal surface so that a metallic coating can be applied to the treated surface and subsequently be removed therefrom. It is believed that the passivating aqueous solution of the present invention passivates a nickel surface by forming a conductive oxide layer on the surface. "
Electromagnetic transducers for converting mechanically acoustic events into alternating voltages. [MI/IM cartridge using ring magnet similar to Ortofon VMS] Also 4512009 new damper developed further from 4054758 though actual embodiment looks much simplified without second elastic element.
Vacuum Turntable System for a Record Player (also 4234195 & 4493072): Optional Suction Pump Unit=""Turbo-Disk-Stabiliser""This idea itself is not new (see 4065135-1977 by Doughty, 3608909-1971 by Rabinow)"
"(no assignment, but the inventors are mainly engineers of JVC)"
Record disc playing apparatus having the function for correcting rotational irregularities due to record disc eccentricity. Angular velocity is controlled electrically in accordance with the eccentric ratio.
"Tone arm. Modified one-point bearing comprising of uni-pivot and ball bearing. A vertical pivot attached to one of the bases and cooperating with a spherical thrust bearing in the other base, and a ball making contact with one of the bases and cooperating with a guiding element in the other base."
"Minimum-sized Portable (Battery Operated) Player. Design Patent D279755. There were similar products from Sony: battery operated ""Flamingo""PS-F9 with Dynamic Balanced Linear Tracking Arm & FM transmitter, mini-compo ""Heli Player""PS-Q7&9 with FM transmitter around 1982."
Dual drive system for phono pickup arm (programmed music selection). The prior art reference No. 4230324 is incorrect. Correct number should be 4230323-1980 (SHARP). Optical music selection idea was invented in 60s: for example 3368080-1968(CITIZEN). Seemingly this application originated from printing machine.
MC with intensified field focus: 1) a rear magnet and a front magnet mounted in an axially juxtaposed manner within a support sleeve so as to define therewith a magnetic field chamber 2) higher output is achieved without increasing the number of windings and thereby adversely affecting the moving mass of the stylus assembly. IMO: Sumiko high output MC cartridges such as Blue Point etc adopt conventional design (one magnet and two yokes) while original patented design was yoke-less=direct.
"Apparatus for the injection moulding of disc records. Two matrices, each bearing modulation to form a microgroove disc record, are fixed to half-moulds by means of sleeves, having first and second fixing flanges which extend into the gap between the matrices."
"Laser Turntable. Also 4972344(1990) for Dual Beam Optical Turntable. There were many attempts before Stoddard - see US Patent 3,325,603(1963) by Rabinow etc: ""Stereo Record Player Using Optical Means Separate from The Tone Arm"" and US Patent 3,992,593(1976) by Heine: ""Disc phonograph record playback by laser generated diffraction pattern"" etc."
Disc reproducing system for compensating mechanical imperfections: his previous patent 4918678 contains many related references (full history of vain attempts to reduce distortions caused by warp etc). Also 4755979(1988)
"Metrological digital audio reconstruction. Audio information stored in the undulations of grooves in a medium such as a phonograph record may be reconstructed, with little or no contact, by measuring the groove shape using precision metrology methods coupled with digital image processing and numerical analysis."
"Method and apparatus for tone arm magnetic stabilization and damping system: satisfies the need for achieving neutral balance and stabilization for unipivot tone arm assemblies including antiskating mechanism using pulley belt tension.