EP1267227A2 - Analoge elektronische Uhr - Google Patents

Analoge elektronische Uhr Download PDF

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Publication number
EP1267227A2
EP1267227A2 EP20020253955 EP02253955A EP1267227A2 EP 1267227 A2 EP1267227 A2 EP 1267227A2 EP 20020253955 EP20020253955 EP 20020253955 EP 02253955 A EP02253955 A EP 02253955A EP 1267227 A2 EP1267227 A2 EP 1267227A2
Authority
EP
European Patent Office
Prior art keywords
motor
rotation
driving pulse
corrective
pulse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20020253955
Other languages
English (en)
French (fr)
Inventor
Teruaki c/o Seiko Instruments Inc. Hanzaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001175691A external-priority patent/JP2002365379A/ja
Priority claimed from JP2001186134A external-priority patent/JP2003004872A/ja
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Publication of EP1267227A2 publication Critical patent/EP1267227A2/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Definitions

  • the present invention relates to an analog electronic timepiece in which the rotation of a motor for driving clock hands is controlled based on a driving pulse supplied from motor control means and which displays time with the clock hands that are driven for rotation by the motor.
  • Analog electronic clocks have been conventionally used including analog electronic wrist watches and analog electronic clocks in which the rotation of a motor for driving clock hands is controlled based on a driving pulse supplied from motor control means and which displays time with the clock hands that are driven for rotation by the motor.
  • a step motor is used as the motor; a normal driving pulse having small effective power and having a predetermined width is supplied to a motor driving circuit from the control means; and the motor driving circuit drives the motor with a pulse having the same width as that of the supplied driving pulse.
  • the rotation of the motor cannot be controlled by the normal driving pulse because of a drop in the power supply voltage, aging of the motor control means or a motor driving mechanism, and so on.
  • the rotation of the motor is detected after the normal driving pulse is supplied to the motor and, when no rotation is detected, a corrective driving pulse having effective power greater than that of the normal driving pulse (for example, a width greater than that of the normal driving pulse) is supplied to the motor to rotate the motor forcibly (for example, see Japanese Patent Publication No. 18148/1988 and Japanese Patent Laid-Open No. 9865/2000).
  • an analog electronic timepiece in which the rotation of a motor for driving clock hands is controlled based on a driving pulse supplied from motor control means and which displays time with the clock hands that are driven for rotation by the motor, characterized in that the motor control means has normal driving pulse generation means for generating a normal driving pulse having a predetermined pulse width, corrective driving pulse generation means for generating a corrective driving pulse having energy higher than that of the normal driving pulse and rotation detecting means for detecting the rotation of the motor and in that the rotation of the motor is controlled by the corrective driving pulse when the rotation detecting means detects that the motor has not been rotated by the normal driving pulse and the rotation control of the motor is stopped when the rotation detecting means detects that the motor has not been rotated by the corrective driving pulse.
  • the rotation of the motor is controlled by the corrective driving pulse when the rotation detecting means detects that the motor has not been rotated by the normal driving pulse, and the rotation of the motor is stopped when the rotation detecting means detects that the motor has not been rotated by the corrective driving pulse.
  • the motor control means has rotation detection driving pulse generation means for generating a driving pulse for detecting rotation, and the motor is driven by the driving pulse for detecting rotation after the rotation of the motor is controlled by the corrective driving pulse to detect whether the motor has rotated or not with the rotation detecting means.
  • the corrective driving pulse may be a driving pulse having a width greater than that of the normal driving pulse.
  • a configuration may be employed in which there is provided notifying means for notifying the fact that the movement of the hands has stopped when the motor control means has stopped controlling the rotation of the motor.
  • Fig. 1 is a block diagram of an analog electronic clock according to a mode for carrying out the invention, and it shows an example of an analog electronic wrist watch.
  • an oscillation circuit 101 is connected to an input section of a control circuit 103 through a dividing circuit 102.
  • a first output section of the control circuit 103 is connected to a step motor 105 for driving clock hands through a motor driving circuit 104.
  • a second output section of the control circuit 103 is connected to a control input section of a rotation detecting circuit 106.
  • a third output section of the control circuit 103 is connected to a notifying device 107 for notifying of the stoppage of the movement of the hands.
  • the notifying device 107 constitutes the notifying means, and a display device which visually notifies of the stoppage of the movement of the hands or a buzzer or the like which acoustically notifies of the same may be used.
  • a rotation detecting circuit 106 for detecting whether the motor 105 has rotated or not is connected between the motor 105 and the control circuit 103.
  • the rotation detecting circuit 106 constitutes the rotation detecting means.
  • the dividing circuit 102 divides the frequency of a reference clock signal from the oscillation circuit 101 and outputs it to the control circuit 103.
  • the control circuit 103 receives the signal from the dividing circuit 102 and outputs a driving pulse to the motor driving circuit 104.
  • a normal driving pulse which is a driving pulse having small effective energy and a predetermined pulse width and a corrective driving pulse which is a driving pulse having effective energy greater than that of the normal driving pulse are prepared as the driving pulse, and the control circuit 103 selectively outputs the normal driving pulse and corrective driving pulse to the motor driving circuit 104 in accordance with a detection signal from the rotation detecting circuit 106.
  • the control circuit 103 constitutes the normal driving pulse generating means for generating the normal driving pulse and the corrective driving pulse generating means for generating the corrective driving pulse.
  • the control circuit 103 supplies the rotation detecting circuit 106 with a control pulse for detecting rotation required for the rotation detecting circuit 106 to detect the rotation of the motor 105.
  • the control circuit 103 constitutes rotation detection control pulse generating means for generating a control pulse for detecting rotation.
  • the motor driving circuit 104 is a motor driving circuit having two P-channel MOS transistors and two N-channel MOS transistors and having a configuration including a circuit in which a coil of the motor 105 is connected between common sources.
  • the oscillation circuit 101, the dividing circuit 102, the control circuit 103 and the rotation detecting circuit 106 constitute the motor control means.
  • Figs . 2 are timing charts in the present mode for carrying out the invention. It shows an example in which it is detected that the motor 105 is not rotating as a result of detection of the rotation of the motor 105 performed by the rotation detecting circuit 106 in response to a control pulse SP1 for detecting rotation after the motor 105 is rotated by a normal driving pulse P1.
  • the motor driving circuit 104 controls the rotation of the motor 105 based on a corrective driving pulse P2 and thereafter controls the rotation of the motor 105 with a driving pulse Px for detecting rotation, and the rotation detecting circuit 106 operates to detect the rotation of the motor 105 in response to a control pulse SP2 for detecting rotation.
  • Fig. 3 and Fig. 4 are circuit diagrams showing the motor driving circuit 104 and the rotation detecting circuit 106; Fig. 3 is an illustration of the control of the rotation of the motor 105; and Fig. 4 is an illustration of the detection of the rotation of the motor 105.
  • Fig. 5 is a waveform diagram of a signal obtained when the rotation of the motor 105 is detected.
  • P-channel MOS transistors 301, 302 and N-channel MOS transistors 303, 304 are transistors included in the motor driving circuit 104, and a coil 307 of the motor 105 is connected between a point where sources of the transistor 301 and transistor 303 are connected and a point where sources of the transistor 302 and transistor 304 are connected.
  • N-channel transistors 305, 306, a resistor 308 for detecting rotation that is series-connected to the transistor 305, a resistor 309 for detecting rotation that is series-connected to the transistor 306 and a comparator 310 are included in the rotation detecting circuit 106.
  • the normal driving pulse P1 in Fig. 2A is supplied from the control circuit 103 to the motor driving circuit 104 and, as a result, the motor driving circuit 104 controls the rotation of the motor 105.
  • the transistors 302, 303 of the motor driving circuit 104 are controlled to be in an on state, and a driving current consequently flows through the coil 307 to rotate the motor 105.
  • the transistors 301, 304 are controlled to be in the on state, and a driving current in the direction opposite to that of the driving current flows through the coil 307 to rotate the motor 105. Thereafter, the operation is repeated to rotate the motor 105.
  • a rotation detecting period is provided immediately after each motor driving period to detect whether the motor 105 has rotated or not.
  • the control pulse SP1 for detecting rotation in Fig. 2C is supplied from the control circuit 103 to the rotation detecting circuit 106.
  • the rotation detecting circuit 106 controls the transistors 304, 305 to put them in the on state as shown in Fig. 4 in response to the control pulse SP1 for detecting rotation, and controls the transistor 303 on/off in predetermined cycles with the transistors 304, 305 in the on state.
  • a detection voltage that develops at the resistor 308 for detecting rotation is taken out from a terminal OUT2.
  • a signal having a waveform as shown in Fig. 5 is obtained as the detection voltage.
  • a predetermined threshold Vss in the present mode for carrying out the invention
  • a rotation detection signal Vs at a high level indicating that the motor 105 is rotating is output from a comparator 310.
  • a rotation detection signal Vs at a low level indicating that the motor 105 is not rotating is output from the comparator 310.
  • the rotation detecting circuit 106 controls the transistors 303, 306 to put them in the on state in response to the next control pulse SP1 for detecting rotation and controls the transistor 304 on/off in predetermined cycles in this state.
  • a detection voltage that develops at the resistor 309 for detecting rotation is taken out from a terminal OUT1.
  • the detection voltage is equal to or lower than the predetermined threshold, i.e., when the motor 105 is rotating, a rotation detection signal Vs at the high level indicating that the motor 105 has rotated is output from the comparator 310.
  • a rotation detection signal Vs at the low level indicating that the motor 105 has not rotated is output from the comparator 310.
  • the control circuit 103 receives the rotation detection signal Vs from the rotation detecting circuit 106 and judges whether the motor 105 has rotated or not.
  • a rotation detection signal Vs indicating that the motor 105 has not rotated is input from the rotation detecting circuit 106 to the control circuit 103.
  • the control circuit 103 judges that the motor 105 has not rotated and supplies a corrective driving pulse P2 having a width greater than that of the normal driving pulse as shown in Fig. 2A to the motor driving circuit 104.
  • the motor driving circuit 104 controls the rotation of the motor 105 with the corrective driving pulse P2.
  • control circuit 103 After the control circuit 103 finishes driving the motor 105 with the corrective driving pulse, it supplies a driving pulse Px having a pulse width smaller than that of the normal driving pulse P1 (Fig. 2B) to the motor driving circuit 104 and thereafter outputs a control pulse SP2 for detecting rotation (Fig. 2D) to the rotation detecting circuit 106.
  • the rotation detecting circuit 106 is a type which detects a voltage induced by the rotation and vibration of a rotor (not shown) included in the motor 105, and the induced voltage is not generated and rotation can not be detected in the case that the vibration of the rotor has already stopped when the corrective driving pulse P2 ends because the corrective driving pulse P2 has a great pulse width. Therefore, the driving pulse Px for detecting rotation is supplied to the motor driving circuit 104 immediately after the end of the corrective driving pulse P2, to vibrate the rotor of the motor 105, and the rotation detecting circuit 105 detects whether there is rotation or not. Therefore, the driving pulse Px for detecting rotation is formed with a pulse width smaller than that of the normal driving pulse because it is required only to vibrate the rotor of the motor 105 and is not required to rotate the motor 105.
  • the motor driving circuit 104 drives the motor 105 with the driving pulse Px for detecting rotation.
  • the rotation detecting circuit 106 detects whether the motor 105 has rotated or not in response to the control pulse SP2 for detecting rotation.
  • the control circuit 103 Upon receipt of the rotation detection signal Vs from the rotation detecting circuit 106 indicating that the motor 105 has rotated, the control circuit 103 thereafter drives the motor 105 with the driving pulse returned to the normal driving pulse P1. On the other hand, upon receipt of the rotation detection signal Vs from the rotation detecting circuit 106 indicating that the motor 105 has not rotated even when driven by the corrective driving pulse, the control circuit 103 stops controlling the rotation of the motor 105 to stop the operation of moving the hands and notifies of the fact that the movement of the hands has been stopped using the notifying device 107.
  • the analog electronic clock according to the present mode for carrying out the invention is particularly an analog electronic clock in which the rotation of a motor 105 for driving clock hands is controlled based on a driving pulse supplied from motor control means and which displays time with the clock hands that are driven for rotation by the motor 105, characterized in that the motor control means has normal driving pulse generation means for generating anormal driving pulse P1 having a predetermined pulse width, corrective driving pulse generation means for generating a corrective driving pulse P2 having energy higher than that of the normal driving pulse P1 and a rotation detecting circuit 106 for detecting the rotation of the motor 105 and in that the rotation of the motor 105 is controlled by the corrective driving pulse P2 when the rotation detecting circuit 106 detects that the motor 105 has not been rotated by the normal driving pulse P1, and the rotation control of the motor 105 is stopped when the rotation detecting circuit 106 detects that the motor 105 has not been rotated by the corrective driving pulse P2.
  • a notifying device 107 for notifying the fact that the motor 105 has stopped is configured such that it notifies the fact that the movement of the hands has stopped when the motor control means has stopped controlling the rotation of the motor 105. It is therefore possible to quickly notify a user of the fact that the movement of the hands of the clock has stopped.
  • the motor control means has rotation detection driving pulse generation means for generating a driving pulse Px for detecting rotation and has a configuration in which it controls the rotation of the motor 105 with the corrective driving pulse P2, thereafter controls the rotation of the motor 105 with the driving pulse Px for detecting rotation and detects whether the motor 105 has rotated or not with the rotation detecting circuit 106. It is therefore possible to detect the rotation of the motor reliably even when the corrective driving pulse P2 is a pulse having a very large width.
  • a driving pulse having a pulse width greater than that of the normal driving pulse P1 is used as the corrective driving pulse P2 in the present mode for carrying out the invention, but it is possible to use a driving pulse having a great wave height value.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Control Of Stepping Motors (AREA)
EP20020253955 2001-06-11 2002-06-06 Analoge elektronische Uhr Withdrawn EP1267227A2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001175691 2001-06-11
JP2001175691A JP2002365379A (ja) 2001-06-11 2001-06-11 アナログ電子時計
JP2001186134A JP2003004872A (ja) 2001-06-20 2001-06-20 アナログ電子時計
JP2001186134 2001-06-20

Publications (1)

Publication Number Publication Date
EP1267227A2 true EP1267227A2 (de) 2002-12-18

Family

ID=26616701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020253955 Withdrawn EP1267227A2 (de) 2001-06-11 2002-06-06 Analoge elektronische Uhr

Country Status (1)

Country Link
EP (1) EP1267227A2 (de)

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