Apparatus for driving a deflecting coil type meter
AssigneeKanto Seiki Co., Ltd.
InventorHideo Okuyama
Life of this patent
Estimating the term…
Abstract
A time-constant circuit is employed for gradually decreasing the voltage of an input signal carrying information to be indicated by a deflecting coil type meter so that the voltage of an input signal applied to the following driving stage does not abruptly drop to zero although the power switch of the driving circuit is turned off. A timer circuit responsive to the power switch energizes a relay or a switching circuit to supply the driving stage with electrical power not only for the time that the power switch is on but also for an additional interval after the power switch is turned off so that the driving stage is capable of being responsive to the gradually decreasing voltage causing the pointer of the meter to return to the zero point.
Claims7
Apparatus for driving a deflecting coil type meter having a pair of coil windings angularly positioned with respect to each other, a magnetic rotor pivotally mounted so as to rotate under the influence of the resultant magnetic field produced by said coil windings, a pointer mechanically connected to said magnetic rotor and having an initial position, and a calibrated dial scale to which deflection of said pointer can be referred, which apparatus comprising:
- (a) a power switch connected to a power supply;
- (b) means for gradually decreasing the voltage of an input signal when said power switch is turned off, said input signal carrying information to be indicated by said meter, so that said coil windings receive said gradually decreasing input signal after said power switch is turned off;
- (c) a driving stage responsive to the output signal of said means, for producing driving currents which are applied to said coil windings;
- (d) a timer circuit responsive to the voltage applied through said power switch for producing an output signal during the time that said power switch is on and for a predetermined interval after said power switch is turned off;
- and
- (e) switching means for supplying said driving stage with electrical power in accordance with said output signal of said timer circuit to rotate said magnetic rotor to cause said pointer to return to its initial position after said power switch is turned off.
Apparatus for driving a deflecting coil type meter having a pair of coil windings angularly positioned with respect to each other, a magnetic rotor pivotally mounted so as to rotate under the influence of the resultant magnetic field produced by said coil windings, a pointer mechanically connected to said magnetic rotor and having an initial position, and a calibrated dial scale to which deflection of said pointer can be referred, comprising:
- (a) a power switch for controlling the output of a power supply;
- (b) a time-constant circuit responsive to an input signal carrying information to be indicated by said meter;
- (c) first switching means for connecting the input of said time-constant circuit to ground when said power switch is turned off;
- (d) a driving stage responsive to the output signal of said time-constant circuit for producing driving currents which are applied to said coil windings;
- (e) a timer circuit responsive to the voltage applied through said power switch for producing an output signal during the time that said power switch is on and for a predetermined interval after said power switch is turned off;
- and
- (f) second switching means for supplying said driving stage with electrical power in accordance with said output signal of said timer circuit to rotate said magnetic rotor to cause said pointer to return to its initial position after said power switch is turned off.
Apparatus for driving a deflecting coil type meter having a pair of coil windings angularly positioned with respect to each other, a magnetic rotor pivotally mounted so as to rotate under the influence of the resultant magnetic field produced by said coil windings, a pointer mechanically connected to said magnetic rotor and having an initial position, and a calibrated dial scale to which deflection of said pointer can be referred, comprising:
- (a) a power switch for controlling an output of a power supply;
- (b) a time-constant circuit responsive to an input signal carrying information to be indicated by said meter;
- (c) first switching means for insulating the input of said time-constant circuit from the former stage thereof when said power switch is turned off;
- (d) a driving stage responsive to the output signal of said time-constant circuit for producing driving currents which are applied to said coil windings;
- (e) a timer circuit responsive to the voltage applied through said power switch for producing an output signal during the time that said power switch is on and for a predetermined interval after said power switch is turned off;
- and
- (f) second switching means for supplying said driving stage with electrical power in accordance with said output signal of said timer circuit to rotate said magnetic rotor to cause said pointer to return to its initial position after said power switch is turned off.
Dependencies are inferred from the claim text.