Control circuit for zooming device

Details Control circuit for zooming device Control circuit for zooming device

1981-07-02

1984-05-01

Chin, Gary

Boots, shoes, and leggings

358225, 350429, 352140, G02B 711

Patent

active

044465262

ABSTRACT:
A compact control circuit for a zoom lens assembly including a microcomputer and external devices including a pulse motor driver section, a detection section, and an operation section coupled through an interface circuit to the microcomputer. The external devices supply a start signal, a magnification specifying signal, an origin position signal and a clock signal to the microcomputer. In response to the signals from the external devices, the microcomputer advances through predetermined programming steps to apply an acceleration/deceleration signal, a forward/reverse rotation signal and a gating signal to the external devices to cause a pulse motor therein to move the zoom lens assembly to a selected magnification position.

REFERENCES:
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4161756 (1979-07-01), Thomas
patent: 4198129 (1980-04-01), Vockenhuber
patent: 4329029 (1982-05-01), Haskell

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