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Theodore D Michaelis

Deceased

from Medford, NJ

Also known as:
  • Theodore Michaelis

Theodore Michaelis Phones & Addresses

  • Medford, NJ

Us Patents

  • Encoder Controlled Apparatus For Dynamic Braking

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  • US Patent:
    44608578, Jul 17, 1984
  • Filed:
    May 31, 1983
  • Appl. No.:
    6/499794
  • Inventors:
    Theodore D. Michaelis - Medford NJ
  • Assignee:
    RCA Corporation - New York NY
  • International Classification:
    H02P 320
  • US Classification:
    318375
  • Abstract:
    A rapidly-spinning motor-driven disc is quickly brought to a halt by utilizing the motor in a controlled current dynamic feedback mode. An electrical signal is provided to cut off the motor braking current when the rotating motor shaft reaches substantially zero velocity, thereby avoiding any residual rotation of the disc. As the disc slows at a constant deceleration rate, the apparatus measures the relative time durations of two consecutive pulses which represent equal displacement arcs on the disc. From these data the time at which zero velocity will be achieved is computed, and the motor current cutoff signal is generated at the proper instant.
  • Solar Torque Compensation For A Satellite

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  • US Patent:
    RE291773, Apr 12, 1977
  • Filed:
    Jun 23, 1975
  • Appl. No.:
    5/589520
  • Inventors:
    Theodore Donald Michaelis - Medford NJ
  • Assignee:
    RCA Corporation - New York NY
  • International Classification:
    B64G 100
  • US Classification:
    244166
  • Abstract:
    A satellite is compensated for torques caused by solar pressure on a solar panel extending from the satellite by an air core coil energized to develop a magnetic torque in opposition to the solar pressure torque. The coil is disposed generally in the periphery of the solar panel mounted externally to the satellite. The energizing current is fixed or varied by ground command or automatically in a closed loop system to compensate for variations in the earth's magnetic field.
  • Eccentricity Control Device

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  • US Patent:
    43653243, Dec 21, 1982
  • Filed:
    Nov 19, 1980
  • Appl. No.:
    6/208439
  • Inventors:
    Theodore D. Michaelis - Marlton NJ
  • Assignee:
    RCA Corporation - New York NY
  • International Classification:
    G11B 2110
    G11B 700
  • US Classification:
    369 44
  • Abstract:
    Eccentricity control apparatus is provided in a system for optically recording and reading information on a rotating disc medium. The information may be recorded on concentric or spiral tracks. The eccentricity control apparatus includes a detector for detecting track crossings as an optical scanning head scans the disc surface. The detector provides pulses representative of track crossings. The number of pulses in a once-around is representative of the amplitude of an eccentricity control signal. The angle measured between a once-around pulse and a minimum pulse rate of the track crossings indicates the phase of the error. An eccentricity error signal which is generated by suitable circuitry is applied to affect the manner in which the optical scanning head scans the disc surface such that number of track crossings is reduced.
  • Thermoelectric Cooling System And Method

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  • US Patent:
    46398830, Jan 27, 1987
  • Filed:
    Nov 28, 1984
  • Appl. No.:
    6/675779
  • Inventors:
    Theodore D. Michaelis - Medford NJ
  • Assignee:
    RCA Corporation - Princeton NJ
  • International Classification:
    F25B 2102
    G06F 1532
  • US Classification:
    364557
  • Abstract:
    A temperature-controlled thermoelectric cooling system regulates the flow of electric current into the thermoelectric cooler in order to maintain a desired cold-side temperature without directly measuring the temperature of the device affixed to the cold side of the cooler. The system includes an apparatus for periodically interrupting the current flowing to the cooler, and during these interruptions measuring the open circuit voltage across the cooler induced by the temperature difference between the hot and cold sides. Computational means use this voltage measurement in conjunction with the temperature of the hot side of the cooler to determine the cold side temperature. From the cold side temperature determination, a controller regulates the current flow to the cooler to maintain a desired cold side temperature.
  • Optical Disc System Having Momentum Compensation

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  • US Patent:
    45162310, May 7, 1985
  • Filed:
    Aug 26, 1982
  • Appl. No.:
    6/411973
  • Inventors:
    Theodore D. Michaelis - Medford NJ
  • Assignee:
    RCA Corporation - New York NY
  • International Classification:
    G11B 712
    G11B 2100
  • US Classification:
    369 44
  • Abstract:
    The focus actuator, turntable and translation stage in an optical disc record/playback system may effect relatively large reaction forces on the components of the system. These reaction forces can cause vibrations which interfere with or distort information recording or retrieving operations which occur at the same time that high speed access is being effected. A momentum compensating mass is coupled to the focus actuator, turntable and other moving elements to reduce or eliminate the reaction forces which can affect system operation.
  • Apparatus And Method For Generating Calibrated Optical Encoder Pulses

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  • US Patent:
    45931933, Jun 3, 1986
  • Filed:
    May 31, 1983
  • Appl. No.:
    6/499795
  • Inventors:
    Theodore D. Michaelis - Medford NJ
  • Assignee:
    RCA Corporation - Princeton NJ
  • International Classification:
    G01D 534
  • US Classification:
    250231SE
  • Abstract:
    Timing pulses generated by an incremental optical encoder disc may be nonuniformly spaced due to eccentricity in the disc mounting and inaccuracies in the pulse generating marks. An apparatus and method are disclosed wherein pulse width measurements are made during one revolution of the disc, and from these measurements data relating to pulse delay information are computed and stored in a memory. During operation the leading edge of each encoder pulse is delayed by a period of time related to the stored delay information corresponding to that specific pulse.

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