Photography – Camera support – Surveillance type
Patent
1997-04-11
1998-09-01
Gray, David M.
Photography
Camera support
Surveillance type
396428, 352 53, 352243, G03B 1724
Patent
active
058024123
ABSTRACT:
The invention is directed to a computer-controlled miniature pan/tilt tracking mount for the precise control of position, velocity, and acceleration of small payloads (e.g., a video camera). The invention consists of a motorized rotational tilt axis mounted atop a motorized rotational pan axis. For both axes, a worm gear mounted upon the motor shaft bidirectionally rotates a worm wheel mounted upon the orthogonal load axis shaft. A large ratio of motor size to armature weight provides high relative torque, speed, and accuracy. The worm gears provide compact reduction with minimal backlash and they can hold position without energized motors to conserve power for battery-operated uses. The invention includes integrated motor drive power electronics and microcontroller execution of host computer commands to effect precise control of pan/tilt mount speed, acceleration, position, configuration, and motor and electronics power consumption. Superior motor drive capabilities are achieved by the use of pulse-width modulation (PWM).
REFERENCES:
patent: 4283766 (1981-08-01), Snyder et al.
patent: 4847543 (1989-07-01), Fellinger
patent: 4945367 (1990-07-01), Blackshear
patent: 5572317 (1996-11-01), Parker et al.
Biska Janis
Gray David M.
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