Electronic clock

A technology of electronic clocks and rotors, applied in the direction of electromechanical clocks, clocks, electrical components, etc., can solve the problems of time delay, fatal electronic clocks, etc., and achieve the effect of increasing the degree of freedom

Active Publication Date: 2009-07-15
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, if the period of the second detection mode is simply increased, the stepping motor will stop, causing time delay and other fatal problems to the electronic clock.

Method used

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Examples

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Effect test

Embodiment 1

[0089] Next, Embodiment 1 of the present invention will be described in detail with reference to the drawings. Embodiment 1 is an example in which the maximum number of detection signals in the second detection mode is changed based on the determination time for determining the presence or absence of the detection signal in the first detection mode, and the determination period of the detection signal is changed. figure 1 is a block diagram showing the circuit configuration of the electronic clock of Embodiment 1, figure 2 It is a pulse waveform diagram generated by the circuit of the electronic clock of embodiment 1, image 3 It is a current waveform and a voltage waveform diagram that occur in the winding when a needle with a large moment of inertia is installed on the electronic clock of Example 1, Figure 4 It is an example of a current waveform and a voltage waveform diagram when the rotor of the electronic clock of the first embodiment is unable to rotate due to a dec...

Embodiment 2

[0110] Next, Embodiment 2 of the present invention will be described in detail with reference to the drawings. Embodiment 2 is an example in which the detection pulse period in the second detection mode is changed and the detection signal determination period is changed based on the determination period for determining the presence or absence of a detection signal in the first detection mode. Figure 8 is a block diagram showing the circuit configuration of the electronic clock of the second embodiment, Figure 9 It is the pulse waveform diagram that the circuit of the electronic clock of embodiment 2 takes place, image 3 It is a current waveform and a voltage waveform diagram (the same drawing as that of Embodiment 1) that occurs in the winding when the electronic clock of Embodiment 2 is equipped with a large needle of moment of inertia, Figure 10 This is an example of a current waveform and a voltage waveform diagram generated in the winding when the rotor of the second ...

Embodiment 3

[0127] Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. Embodiment 3 is an example in which the period of the detection pulse is changed for some detection signals in the second detection mode according to the detection conditions in the first detection mode. Figure 12 is a block diagram showing the circuit configuration of the electronic clock of the third embodiment, Figure 13 It is the pulse waveform diagram of the circuit output of the electronic clock of embodiment 3, image 3 It is a current waveform and a voltage waveform diagram (the same drawings as in Embodiment 1) that occur in the winding when a needle with a large moment of inertia is installed in the electronic clock of Embodiment 3, Figure 14 It is a current waveform and a voltage waveform diagram when the rotor of the electronic clock of Example 3 cannot rotate. Components that are the same as those described in the conventional example or Embodiment 1...

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Abstract

To provide an electronic clock which has no erroneous determination of rotation detection and in which even if the second hand has a large moment of inertia, unnecessary current consumption can be suppressed. The electronic clock uses a first detection mode determination circuit (112) and a second detection mode determination circuit (113) to perform the rotation detection. The electronic clock includes a determination selecting circuit (113c) as a changing means for changing the determination interval of the second detection mode in accordance with the determination interval of the first detection mode. Even in a case of the current waveform being disturbed, if the first detection mode terminates earlier, the determination terminal of the second detection mode is shortened, thereby preventing any erroneous determinations. The change of the determination interval is done by the determination selecting circuit (113c) selecting either a seven-times detection / determination circuit (113a) that terminates the determination after seven detection pulses or a six-times detection / determination circuit (113b) that terminates the determination after six detection pulses. Alternatively, the period of the detection pulse may be shortened instead of using the number of detection pulses.

Description

technical field [0001] The invention relates to an electronic clock with a stepping motor. [0002] This application claims priority based on Japanese Patent Application No. 2006-186524 for which it applied to Japan Patent Office on July 6, 2006, and uses the content here. Background technique [0003] Electronic clocks in recent years have greatly extended battery life by reducing the current consumption of stepping motors. The reduction in current consumption of the stepping motor is generally achieved by driving the stepping motor with a small driving force that consumes less current, and driving the stepping motor with a large driving force only when the load increases and the rotor cannot rotate. In the existing method, the detection of the rotation / non-rotation of the rotor is often performed in the following way, that is, after the application of the normal driving pulse is completed, the detection pulse is output to cause the winding impedance value of the stepping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04C3/14H02P8/38
CPCH02P8/38G04C3/143
Inventor 佐藤浩一田京祐
Owner CITIZEN WATCH CO LTD
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