Title:
ZOOM LENS DRIVING DEVICE
Document Type and Number:
Japanese Patent JPH05188264
Kind Code:
A
Abstract:
PURPOSE:To secure constant zooming speed and image forming performance by inputting the information of a change in an ambient temperature from a temperature sensor, to a control part, and changing a driving voltage imparted to the driving part of a zooming motor from a voltage supplying part, by means of the control part. CONSTITUTION:This zoom lens driving device is composed of the zooming motor 2 sending out the photographing lens part of a zoom lens unit 1, the driving part 3 controlling the zooming motor 2, the voltage supplying part 4 of a constant voltage circuit, applying a prescribed voltage to the driving part 3, the temperature sensor 5, and the control part 6 of a CPU, controlling each part. When the ambient temperature is changed, the control part 6 turns on one of output ports with detection data from the temperature sensor 5, according to the detection data. At this time, the output voltage of an operational amplifier is adjusted to a voltage corresponding to temperature, and the driving part 3 receives the voltage and controls the zooming motor 2. Therefore, even when the zoom lens unit 1 is shrunk by temperature, and the load of the unit 1 is made high, the same position control as that in the normal temperature, is executed.
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Inventors:
SAKAGUCHI TORU
Application Number:
JP12371091A
Publication Date:
July 30, 1993
Filing Date:
May 28, 1991
Export Citation:
Assignee:
RICOH KK
International Classes:
G02B7/02; G02B7/08; G03B5/00; (IPC1-7): G02B7/02; G02B7/08; G03B5/00
Attorney, Agent or Firm:
Taketoshi Mototoshi