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Ericson Dunstan Phones & Addresses

  • 534 Island View Cir, Port Hueneme, CA 93041 (805) 488-3991
  • 19856 Mayall St, Chatsworth, CA 91311
  • 116 Junipero St, Santa Barbara, CA 93105
  • 20 Junipero St, Santa Barbara, CA 93105
  • 29 Valerio St, Santa Barbara, CA 93101
  • Newhall, CA
  • Woodland Hills, CA
  • Ventura, CA
  • 534 Island View Cir, Port Hueneme, CA 93041 (916) 728-1824

Work

Position: Food Preparation and Serving Related Occupations

Education

Degree: Associate degree or higher

Business Records

Name / Title
Company / Classification
Phones & Addresses
Ericson M. Dunstan
Director, Secretary
Micropolis Corporation, A Delaware Corporation
21211 Nordhoff St, Chatsworth, CA 91311

Publications

Us Patents

Winchester Disk Drive Motor Circuitry

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US Patent:
4839754, Jun 13, 1989
Filed:
Feb 26, 1987
Appl. No.:
7/019543
Inventors:
Bipin V. Gami - Chatsworth CA
Ericson Dunstan - Port Hueneme CA
Assignee:
Micropolis Corporation - Chatsworth CA
International Classification:
G11B 1546
G11B 1928
US Classification:
360 7301
Abstract:
An improved switching regulator power supply with a variable duty cycle is disclosed which forms part of a compact Winchester disk drive system having a storage capacity in excess of 380M bytes of information. The switching regulator is designed for frequencies in excess of 80 kilocycles per second and may therefore be construced using smaller capacitive and inductive elements. Also, very low heat dissipation and high regulator efficiency may be achieved by the improved power supply to drive a brushless D. C. motor encased within a hard disk assembly where no separate fan or cooling system is used to aid in heat removal. Circuitry is provided to control the motor speed while simultaneously limiting the motor current to a predetermined level. This is a achieved by controlling the voltage applied to the motor by suitably adjusting the duty cycle of the switching regulator. A filter is provided to ensure that the switching regulator current fluctuations are not reflected in the current drawn from the power supply.

Low Loss Brushless Dc Motor

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US Patent:
4329604, May 11, 1982
Filed:
Aug 6, 1979
Appl. No.:
6/063856
Inventors:
Ericson M. Dunstan - Hidden Hills CA
William J. Gervais - Northridge CA
Bipin V. Gami - Chatsworth CA
Assignee:
Micropolis Corporation - Canoga Park CA
International Classification:
H02K 1100
US Classification:
310 68R
Abstract:
A printed circuit motor is constructed with the printed circuit windings stationary, and therefore constituting the stator of the motor. The stator is mounted at the end of a heavy hollow supporting frame member. The rotor is mounted on the end of a shaft which is journaled within the hollow frame member, and the rotor extends outwardly in close proximity to the stator and around the outer periphery of the stator and back toward the hollow supporting member, with a permanent magnet assembly on one side of the printed circuit stator and the magnetic return path on the other side of it. The permanent magnet assembly and the magnetic return path are rigidly coupled so that no relative motion occurs between them. Electrical connections to the winding turns of the stator are brought out from the periphery of the stator close to its surface through an additional printed circuit board, and along the outer surface of the hollow frame member to pass the inner edge of the permanent magnet rotor. Timing for the energization of the coils of the printed circuit stator is controlled by three photosensors which are interrupted by the outer edge of the rotating return path of the rotor, which is provided with a peripheral interruptions to selectively block the light path to the photosensors.

Winchester Disk Drive Motor Circuitry

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US Patent:
RE34399, Oct 5, 1993
Filed:
Jul 24, 1992
Appl. No.:
7/920143
Inventors:
Bipin V. Gami - Northridge CA
Ericson Dunstan - Port Hueneme CA
Assignee:
Micropolis Corporation - Los Angeles CA
International Classification:
G11B 1546
G11B 1928
US Classification:
360 7301
Abstract:
An improved switching regulator. Iadd. DC-DC power converter or. Iaddend. power supply with a variable duty cycle is disclosed which forms part of a compact Winchester disk drive system having a storage capacity in excess of 380M bytes of information. The switching regulator is designed for frequencies in excess of 80 kilocycles per second and may therefore be construced using smaller capacitive and inductive elements. Also, very low heat dissipation and high regulator efficiency may be achieved by the improved. Iadd. power converter or. Iaddend. power supply to drive a brushless D. C. motor encased within a hard disk assembly where no separate fan or cooling system is used to aid in heat removal. Circuitry is provided to control the motor speed while simultaneously limiting the motor current to a predetermined level. This is a achieved by controlling the voltage applied to the motor by suitably adjusting the duty cycle of the switching regulator.

Shock Resistant Winchester Disk Drive

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US Patent:
4947093, Aug 7, 1990
Filed:
Nov 25, 1988
Appl. No.:
7/276299
Inventors:
Ericson M. Dunstan - Port Hueneme CA
Dennis Hogg - Simi Valley CA
John E. Scura - Thousand Oaks CA
Assignee:
Micropolis Corporation - Chatsworth CA
International Classification:
G05B 1300
US Classification:
318560
Abstract:
A shock resistant hard disk drive system employs a plurality of magnetic disks for recording data, a plurality of magnetic heads for performing input/output operation on the magnetic disks, with at least one of the magnetic heads being used as a servo head, a head-positioning mechanism for controlling the movement of the magnetic heads, a servo control mechanism or servo loop for opposing shifts in the location of the servo head, detecting device for detecting and measuring certain accelerations applied to the system, and filtering device for filtering the output of said detecting device and for providing the signal to the head-positioning mechanism. The detecting device detects and measures the magnitude of internal or external accelerations or shocks applied to the system, and provides the necessary signals to counter such accelerations. The pre-existing phase locked loop includes a voltage controlled oscillator, with the voltage control signal applied to the oscillator indicating instantaneous rotational velocity resulting from accelerations applied to the system; and this control signal is modified and applied to servo loop for the head positioner, to hold the head positioner against shifting off track.

High Precision Floppy Disc Memory System

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US Patent:
4523240, Jun 11, 1985
Filed:
May 25, 1979
Appl. No.:
6/042721
Inventors:
Ericson M. Dunstan - Hidden Hills CA
William J. Gervais - Northridge CA
S. Barry McClelland - Woodland Hills CA
Assignee:
Micropolis - Chatsworth CA
International Classification:
G11B 5016
US Classification:
360 99
Abstract:
A "floppy" disc digital magnetic storage apparatus or subsystem includes a number of interrelated features permitting greatly increased data storage and good access time, while using relatively inexpensive parts. The features contributing to the greatly increased storage capacity include arrangements for providing one hundred tracks per inch, and for holding tolerances so that the position of the magnetic head in the radial direction is maintained within the required value of plus or minus 1. 7 thousandths of an inch. Features contributing to the high accuracy of magnetic head positioning, and the resultant high data capacity, include the following: (1) mounting the lead screw which positions the magnetic head with its inner end close to the center of the magnetic disc fixed in position, and with its outer end and the stepping motor secured to it mounted on a leaf spring pushing the motor and the outer end of the lead screw inward toward the inner end of the lead screw: (2) utilizing a simple sheet metal stepper motor having two sets of punched metal teeth which interfit with one another and which are exposed to a central permanently magnetized rotor having north and south poles successively located around its periphery; two coils are provided and each of these coils can be energized in opposite directions, with the four combinations resulting in progressive stepping of the permanent magnetic armature, with every fourth step having a more accurately defined angular position than the three intermediate steps; (3) by a special energization arrangement, the rotor is moved four steps at a time to shift the head from one track to the next, thereby using only the more accurately located angular positions, and reducing the adverse effects of friction on head positioning; (4) the electronic circuitry associated with driving the step motor is configured to offset any time penalty incurred by taking four steps to move one track; (5) the floppy disc is accurately positioned relative to the inner end of the lead screw by forcing the magnetic disc to an interference fit relationship with the driving spindle hub on which it is mounted, and (6) the lead screw is ground to mate with a conical pin secured to the movable head assembly.
Ericson M Dunstan from Port Hueneme, CA, age ~89 Get Report