Zoom lens apparatus
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United States of America Patent
Stats
-
Jun 24, 1986
Grant Date -
N/A
app pub date -
Dec 13, 1983
filing date -
Dec 14, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A zoom lens apparatus comprising a moving construction for moving a zoom-ratio adjusting barrel composed of a variator-lens amount and a compensator-lens mount by the rotation along the direction of the optical axis within the fixed barrel; a stepping motor, which is coupled to the moving construction is composed of a rotor having a hollow portion as a light path including the optical axis and a stator to be combined with the rotor, and reversibly rotates in accordance with the pulse signal to be applied; and a circuit means for controlling the operation of the stepping motor with providing advantages and that the reduction gear and clutch mechanism are not required, the outer shape is kept cylindrical, but is not required bigger in size and the price can be made lower.
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Family
International Classification(s)
Cited Art Landscape
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