JPH0640893U - Analog clock correction circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the current consumption during normal hand operation in an analog timepiece capable of high-speed correction. [Arrangement] This analog timepiece correction circuit includes a normal current supply circuit 10, a smoothing circuit 18 charged by the normal current supply circuit 10, and a correction current supply circuit 12. During normal hand movement, current is supplied to the clock circuit 2 by discharging the smoothing circuit 18, and current is supplied from the correction current supply circuit 12 when the correction switch 14 is operated. Therefore, at the time of normal hand movement, the minimum current required for driving the hands is supplied to the timepiece circuit, and at the time of time adjustment, more current can be supplied than at the time of normal hand movement so that the hands can be driven at high speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a correction circuit that supplies current to a clock circuit of an analog timepiece during normal hand movement and during time adjustment.

[0002]

[Prior art]

 Conventionally, the current has been supplied to the timepiece circuit of the analog timepiece from a single current supply circuit. Therefore, the same current was supplied to the clock circuit during normal hand movement and during time adjustment.

Generally, the time adjustment of an analog timepiece is performed by driving the hands at a high speed, but in this case, a larger current is required than in the normal hand movement. Therefore, conventionally, the current required for time adjustment was always supplied to the clock circuit.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional example, it is necessary to constantly supply the current necessary for the time adjustment to the clock circuit, so that the current during the normal hand movement cannot be reduced.

The present invention has been made in view of the above problems, and an object thereof is to reduce current consumption during normal hand movement in an analog timepiece capable of high-speed correction.

[0006]

[Means for Solving the Problems]

 The correction circuit for an analog timepiece of the present invention is an analog timepiece having a timekeeping circuit capable of driving the hands at high speed during time adjustment. A correction switch operated when adjusting the time, and a correction current supply circuit that supplies more current to the clock circuit by operating the correction switch than in the normal hand movement. It

[0007]

[Action]

 The correction circuit of the analog timepiece of the present invention is provided with a normal current supply circuit, a smoothing circuit charged by the normal current supply circuit, and a correction current supply circuit. During normal hand movement, current is supplied to the timepiece circuit by the discharge of this smoothing circuit, and current is supplied from the correction current supply circuit when the correction switch is operated. Therefore, at the time of normal hand movement, the minimum current necessary for driving the hands is supplied to the timepiece circuit, and at the time adjustment, a larger amount of current can be supplied than at the time of normal hand movement so that the hands can be driven at high speed.

[0008]

【Example】

 FIG. 1 is a circuit diagram showing a circuit configuration of a correction circuit for an analog timepiece according to an embodiment of the present invention. Reference numeral 2 is a clock circuit composed of a clock IC. A crystal oscillator 4 and a step motor 6 that drives a pointer are connected to the clock circuit 2. Further, the clock circuit 2 is configured to drive the pointer at high speed when the time is adjusted.

Reference numeral 8 is a DC power source including a battery and the like.

Reference numeral 10 is a normal current supply circuit for supplying a current necessary for normal hand movement to the timepiece circuit 2. The normal current supply circuit 10 includes a diode D1 and a resistor R1 connected in series between the power supply 8 and the power supply input terminal VDD of the clock circuit 2.

Reference numeral 12 is a correction current supply circuit that supplies the clock circuit 2 with a current required for time adjustment for driving the hands at high speed. The correction current supply circuit 12 is connected in series between the power supply 8 and the power supply input terminal VDD of the clock circuit 2 and is connected in parallel with the diode D1 and the resistance R1 of the normal current supply circuit 10. It consists of R2 and diode D2. The relationship between the resistance values of the resistors R2 and R1 is set so that R2 <R1.

A correction switch 14 is provided between the power supply 8 and the resistor R 2 of the correction current supply circuit 12.

Reference numeral 16 is a correction signal output circuit that outputs a correction signal in response to an ON operation of the correction switch 14. The correction signal output circuit 16 includes a diode D3 and a resistor R3 connected in series between a connection point between the resistance R2 and the diode D2 of the correction current supply circuit 12 and the correction input CT of the clock circuit 2, and the resistance D3. It is composed of a Zener diode ZD1 connected between the line connecting R3 and the modified input CT and the ground to keep the voltage constant.

Reference numerals 18 and 20 denote smoothing circuits for smoothing the supply currents connected between a line connecting the resistor R1 and the diode D2 and the power supply input terminal VDD of the clock circuit 2 and the ground, and constant voltages. It is a voltage circuit. The smoothing circuit 18 is composed of a capacitor C1, and the constant voltage circuit 20 is composed of a Zener diode ZD2.

Next, the operation of the correction circuit of the analog timepiece having the above configuration will be described. During normal hand movement, the correction switch 14 is off, so the correction current supply circuit 12 and the correction signal output circuit 16 are disconnected from the power supply 8. At this time, the normal current supply circuit 10 limits the current by the resistor R1 to supply the minimum necessary current to the normal hand movement. This current is supplied to the smoothing circuit 18 to charge the capacitor C1 and is applied to the power supply input terminal VDD of the timepiece circuit 2 together with its discharge to drive the step motor 6 step by step.

When the correction switch 14 is turned on here, the correction current supply circuit 12 and the correction signal output circuit 16 are connected to the power source 8 via the correction switch 14. Therefore, the current flows through the resistor R2 having a smaller resistance value than the resistor R1 through the correction switch 14, passes through the diode D2 as a current required for high-speed hand movement, and is supplied to the power supply input terminal VDD. At this time, a part of the current flowing through the resistor R2 is applied to the correction input CT of the timepiece circuit 2 via the diode D3 and the resistor R3. In response to this, the clock circuit 2 rotates the step motor 6 at a high speed to correct the time. As described above, when the step motor 6 is rotated at a high speed, there is no time to obtain the current necessary to drive the step motor 6 by charging / discharging the capacitor C1 with the current from the normal current supply circuit 10. The current supply from the supply circuit 12 continues to supply the current required for driving the step motor 6 to the timepiece circuit 2 during correction.

Although the normal current supply circuit 10 and the correction signal output circuit 16 in this embodiment include the diodes D1 and D3, the diodes D1 and D3 can be omitted.

[0018]

[Effect of device]

 According to the present invention, it is possible to supply the necessary currents to the timepiece circuit both during normal hand movement and during high-speed correction, so that the current consumption during normal hand movement can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit configuration of a correction circuit for an analog timepiece according to an embodiment of the present invention.

[Explanation of symbols]

 2 clock circuit 8 power supply 10 normal current supply circuit 12 correction current supply circuit 14 correction switch 16 correction signal output circuit 18 smoothing circuit

Claims (1)

[Scope of utility model registration request] 1. An analog timepiece having a timepiece circuit capable of driving hands at a high speed at the time of time adjustment, a smoothing circuit which is charged by a normal current supply circuit and supplies a current to the timepiece circuit at the time of normal hand movement, and a time adjustment time adjustment device. A correction circuit for an analog timepiece, comprising: a correction switch that is operated; and a correction current supply circuit that supplies more current to the timepiece circuit when the correction switch is operated than during normal hand movement.