Camera
AssigneeFuji Photo Optical Co., Ltd.
InventorsMichihiro Shiina, Jun'ichi Iwamoto, Fumio Iwai
Life of this patent
Estimating the term…
Abstract
A camera having a zoom system which comprises a front lens group driven by a DC motor and a rear lens group driven by a stepping motor includes a motor control apparatus for controlling the DC motor and the stepping motor. The motor control apparatus voltage measuring means for measuring a voltage of a power source for driving the DC motor and the stepping motor, decision means for deciding as to whether the voltage is more than a predetermined value, means for simultaneously driving the DC motor and the stepping motor, if a decision is made that the voltage is more than the predetermined value, and means for driving only the DC motor and thereafter driving only the stepping motor, if the voltage is not more than the predetermined value.
Claims58
A camera comprising:
- a camera body;
- a front lens group arranged as movable backward and forward relative to said camera body;
- a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body;
- a front lens group driving motor for driving said front lens group;
- a rear lens group driving motor for driving said rear lens group;
- a zoom switch;
- and
- a motor control apparatus for controlling said front lens group driving motor and said rear lens group driving motor, wherein when said zoom switch is on, if a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor is more than a predetermined value said motor control apparatus simultaneously drives said front lens group driving motor and said rear lens group driving motor, whereas if the voltage is not more than said predetermined value said motor control apparatus drives only said front lens group driving motor and thereafter drives only said rear lens group driving motor.
A camera lens driving motor control apparatus for use in a camera having a camera body, a front lens group arranged as movable backward and forward relative to said camera body, a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body, a front lens group driving motor for driving said front lens group, a rear lens group driving motor for driving said rear lens group, and a zoom switch, comprising:
- voltage measuring means for measuring a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor;
- decision means for deciding as to whether the voltage is more than said predetermined value;
- first motor controlling means for controlling said front lens group driving motor and said rear lens group driving motor, said first motor controlling means having means for simultaneously driving said front lens group driving motor and said rear lens group driving motor if a decision is made that the voltage is more than said predetermined value;
- and
- second motor controlling means for controlling said front lens group driving motor and said rear lens group driving motor, said second motor controlling means having means for driving only said front lens group driving motor and thereafter driving only said rear lens group driving motor if the voltage is not more than said predetermined value.
A camera lens driving motor control method for use in a camera having a camera body, a front lens group arranged as movable backward and forward relative to said camera body, a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body, a front lens group driving motor for driving said front lens group, a rear lens group driving motor for driving said rear lens group, and a zoom switch, comprising the steps of:
- measuring a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor;
- deciding as to whether the measured voltage is more than said predetermined value;
- simultaneously driving said front lens group driving motor and said rear lens group driving motor, if a decision is made that the measured voltage is more than said predetermined value;
- and
- driving only said front lens group driving motor and thereafter driving only said rear lens group driving motor, if the measured voltage is not more than said predetermined value.
A camera comprising:
- a camera body;
- a front lens group arranged as movable backward and forward relative to said camera body;
- a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body;
- a front lens group driving motor for driving said front lens group;
- a rear lens group driving motor for driving said rear lens group;
- a zoom switch;
- and
- a motor control apparatus for controlling said front lens group driving motor and said rear lens group driving motor, wherein when said zoom switch is on, if a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor is more than a predetermined value said motor control apparatus simultaneously drives said front lens group driving motor and said rear lens group driving motor, whereas if the voltage is not more than said predetermined value said motor control apparatus alternately drives said front lens group driving motor and said rear lens group driving motor by respective predetermined amounts.
A camera lens driving motor control apparatus for use in a camera having a camera body, a front lens group arranged as movable backward and forward relative to said camera body, a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body, a front lens group driving motor for driving said front lens group, a rear lens group driving motor for driving said rear lens group, and a zoom switch, comprising:
- voltage measuring means for measuring a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor;
- decision means for deciding as to whether the voltage is more than said predetermined value;
- first motor controlling means for controlling said front lens group driving motor and said rear lens group driving motor, said first motor controlling means having means for simultaneously driving said front lens group driving motor and said rear lens group driving motor, if a decision is made that the voltage is more than said predetermined value;
- and
- second motor controlling means for controlling said front lens group driving motor and said rear lens group driving motor, said second motor controlling means having means for alternately driving said front lens group driving motor and said rear lens group driving motor by respective predetermined amounts, if the voltage is not more than said predetermined value.
A camera lens driving motor control method for use in a camera having a camera body, a front lens group arranged as movable backward and forward relative to said camera body, a rear lens group disposed between said camera body and said front lens group as movable backward and forward relative to said camera body, a front lens group driving motor for driving said front lens group, a rear lens group driving motor for driving said rear lens group, and a zoom switch, comprising the steps of:
- measuring a voltage of a power source for driving said front lens group driving motor and said rear lens group driving motor;
- deciding as to whether the measured voltage is more than said predetermined value;
- simultaneously driving said front lens group driving motor and said rear lens group driving motor, if a decision is made that the measured voltage is more than said predetermined value;
- and
- alternately driving said front lens group driving motor and said rear lens group driving motor by respective predetermined amounts, if the measured voltage is not more than said predetermined value.
Dependencies are inferred from the claim text.