Theodore D Michaelis

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.

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.

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.

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.

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.

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.