US3742697A - Driving arrangement for an electric watch - Google Patents

Driving arrangement for an electric watch Download PDF

Info

Publication number
US3742697A
US3742697A US00166500A US3742697DA US3742697A US 3742697 A US3742697 A US 3742697A US 00166500 A US00166500 A US 00166500A US 3742697D A US3742697D A US 3742697DA US 3742697 A US3742697 A US 3742697A
Authority
US
United States
Prior art keywords
signal
divider
stage
output
shaping circuit
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.)
Expired - Lifetime
Application number
US00166500A
Other languages
English (en)
Inventor
T Hama
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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
Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3742697A publication Critical patent/US3742697A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • ABSTRACT An electric watch including an electro-mechanical converter driven by a signal produced by dividing a series of divider means, a relatively high frequency oscillating time standard signal. The output of the last of said divider means is combined in a wave shaping logic circuit with the output of an intermediate stage of said divider means for producing a pulse signal for application to an electro-mechanical converter, the width of the pulses of which is determined by the period of said intermediate stage output.
  • This invention relates to an electric watch wherein an electro-mechanical converter is driven by an alternatingpulse signal.
  • a standard signal such as the output of a crystal vibrator having a relatively high oscillating frequency is divided into low frequencies by divider circuits and wave shaping circuits.
  • circuits have generally consisted of flip-flops and monostable multi-vibrators incorporating resistive and capacitive components, which have occupied a large space, and have caused problems in reliability, difficulties which are particularly troublesome in wrist watches.
  • FET field effect type transistors
  • IC integrated circuits
  • the wave shaping circuitry utilized to shape the divided output of the crystal oscillator of an electric watch is formed from logic circuitry formed from field effect transistors utilizing integrated circuit techniques, without the use of resistive or capacitive elements.
  • a series of divider means are utilized to divide the output of the crystal oscillator, and a wave shaping logic circuit means combines the output of the last of said divider means with the output of an intermediate stage of said divider means to produce an alternating pulse driving signal for an electro-mechanical converter, the width of said pulse being determined by the period of the output of said intermediate divider means stage.
  • one object of the invention is to provide a driving circuit for a quartz crystal wrist watch and the like using a direct coupled type of logic circuit.
  • Another object of the invention is to provide an electric watch utilizing highly reliable integrated circuits including MOS FETs.
  • FIG. 1 is a circuit diagram showing a conventional type of driving circuit for a quartz crystal watch and the like
  • FIG. 2 is a circuit and schematic diagram showing the electro-mechanical converter driving circuit according to the invention
  • FIG. 3 is a wave form diagram showing the wave forms of the signals applied to the driving circuit of FIG. 2;
  • FIG. 4 is a block diagram showing the divider and wave shaping circuits according to the invention.
  • FIG. 5 is a circuit diagram of the wave shaping circuits of FIG. 4;
  • FIG. 6 is a circuit diagram of part A of FIG. 5.
  • FIG. 7 is a wave form diagram showing the wave forms of the signals of the circuit of FIG. 5.
  • the conventional driving arrangement for an electric watch depicted includes a flip-flop circuit FF supplied by a one second signal.
  • Each of the outputs of said flip-flop circuit is connected to a monostable multi-vibrator MV and MV which are alternately triggered from the left and right side of the flip-flop.
  • Said multi-vibrators form the signal into a predetermined pulse width which is applied to the bases of a pair of complementary driving transistors.
  • both the flip-flop and the monostable multivibrators incorporate resistive and capacitive elements. The foregoing arrangements produces a driving current flowing alternately through coils L and L of an electro-mechanical converter.
  • said monostable multi-vibrators must incorporate high value resistors having a resistance of about 10 M9 and high value capacitors of about 1,500 PF.
  • Such resistors and capacitors occupy too large a portion of the space available in a wrist watch, and the wiring projecting from such electrical component results in relatively low reliability.
  • FIG. 2 one embodiment of a pulse motor according to the invention is shown coupled to a driving circuit.
  • the pulse motor of FIG. 2 is shown by way of example, other types of electro-mechanical converters being equally applicable to the electric watch according to the invention.
  • a rotor l is provided formed with a permanent magnet having six poles. Said rotor rotates in the field ofa yoke 2 having coils 3 wound about legs thereof. The rotation of the rotor is transmitted to a wheel 4 which drives a second hand 5.
  • Bipolar transistors 6 and 7 of the PNP type are coupled with bipolar transistorsS and 9 of the NPN type to form a driving circuit.
  • Driving signals consisting of inputs 1, 2, 3 and 4 are applied respectively to the bases of driving transistors 6, 7, 8 and 9. Said driving transistors are coupled as complementary pairs and the input signals are adapted such that alternating pulses of a width 1,, are applied to coil 3 every second.'Thus, the driving signal is appliedto transistors 6 and 8 at the same time to apply a pulse in one direction to coil 3, and then a driving signal is applied to transistors 7 and 9 to apply a driving current to coil 3 in the opposite direction.
  • t is generally selected to be 15 milliseconds.
  • Inputs 1 and 2 are of positive potential but their potentials become zero only when the pulse of t,, width is applied to coil 3.
  • Inputs 3 and 4 correspond to and are the reverse of the signals of input 1 and 2.
  • the wave forms of inputs 1 and 3 are shifted by one second as compared with the wave forms of inputs 2 and 4.
  • the signals of inputs 1, 2, 3 and 4 are applied to the driving circuit with a time delay of r in the worst case after a resetting signal is applied by resetting means from outside the circuit.
  • a crystal oscillator of the quartz crystal watch according to our invention has 16,385 kHz of frequency. This signal is divided into 2 second signal by lS-stage flip-flop circuit.
  • the resetting mechanism is provided in order to set a watch by standard time.
  • the resetting circuit is not provided in flip-flop circuit from the first stage to 8 stage, and it is provided in flip-flop circuit from 9 stage to 15 stage because the resetting circuit is complicated, 8-stage signal is 64 Hz and when the reset switch provided in the watch case is cut off and the. watch starts, the value of time delay td which is shifted from the standard time is very small, so it is convenient for the user of the watch. Therefore, the value of rd has not a direct relation with the inventive thought of the present invention.
  • the time standard signal source F is divided into a one second signal by a series of divider flip-flop circuits F F F,,, F,..
  • the outputs of flip-flops F and F are applied to wave shaping circuits A, B and C to produce input signals 1, 2, 3 and 4 depicted in FIG. 3.
  • Shaping circuit A serves to delay input signal F, by the pulse width of input signal F,,.
  • the signal P is an alternating signal reversed every other second, and is the output of a flip-flop having a two second period.
  • the signal F is the output signal of a flip-flop having a pulse width of one-sixtyforth of a second. Accordingly, shaping circuit A serves to delay the wave form F, with its two second period by one sixty-fourth second from the initial signal.
  • Shaping circuits B and C receive the signal from shaping circuit A, the signal F, with its 2 second period, and the signal F a signal which is 180 out of phase with F Shaping circuit B includes a NAND gate while shaping circuit C includes a NOR gate, said circuits being adapted to produce the input signals depicted in FIG. 3.
  • FIG. 5 shows the circuit diagrams of shaping circuits A, B and C, which utilize MOS FET integrated circuits.
  • the entire circuitry can be assemblied in a very small-sized device which is extremely reliable, and particularly adapted for mass production.
  • the left half side of shaping circuit B includes said NAND gate, while the right hand side thereof includes an inverter circuit.
  • shaping circuit C includes, in its left hand side, a NOR gate, and in its right hand side an inverter circuit.
  • any pulse width can be obtained in the circuit according to the invention by merely shifting F to F,, or F 7
  • part A of FIG. 5 includes a transmission gate with terminals 1, 2 and 3 served as transfer switch, a NAND circuit 4 and an inverter.
  • Fx (2 second signal) is put in terminal 1
  • Fn and F5 32 Hz are put in terminal 3.
  • Output signal FxD can obtain output signal which is delayed tm as shown in FIG. 7.
  • the signal of input 3 is formed as shown in upper part B of FIG. 5.
  • the signal of input 4 is formed as shown in lower part B of FIG. 5.
  • the signals of input I and 2 are formed at part C of FIG. 5 based on the following equation, wherein the-signal ofinput 1 is Fx'FI.
  • the signal of input 2 can be obtained as follows: i
  • the transistor employs an enhancement type of Metal-Oxide-Semiconduct Field Effect Transistor (MOS- FET).
  • MOS- FET Metal-Oxide-Semiconduct Field Effect Transistor
  • the desired alternating pulse of ultra low frequency is obtained by connecting the output of the shaping circuits according to the invention with four transistors as shown in FIG. 2. In this manner, the pulse motor of FIG. 2 can be driven to produce a high quality quartz crystal electric watch.
  • An electric watch comprising a crystal oscillator oscillating at a relatively high frequency; a DC source having a pair of terminals; a stepped motor; and circuit means for applying an alternating driving signal to said stepped motor derived from the output of said crystal oscillator including frequency divider and wave shaping circuit means formed from MOS transistors and driving circuit means for applying said driving signal to said stepped motor in response to the signals from said wave shaping circuit means, said driving circuit means including two pairs of switching means, each of said pairs being connected in series with said stepped motor between said DC source terminals, said wave shaping circuit means being directly coupled to said switching means without capacitors.
  • An electric watch comprising an electromechanical converter; means for producing a relatively high frequency oscillating time standard signal; a plurality of divider means coupled to said time standard means for producing at its output stage a signal of relatively low frequency; and wave form shaping circuit means coupled to said divider means for receiving the output signal of said last divider means stage and of an intermediate divider means stage, and coupled to said electro-mechanical converter for applying an alternating pulse signal thereto of a pulse width representative of the pulse width of the signal from said intermediate stage of said divider means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)
US00166500A 1970-07-27 1971-07-27 Driving arrangement for an electric watch Expired - Lifetime US3742697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6503370 1970-07-27

Publications (1)

Publication Number Publication Date
US3742697A true US3742697A (en) 1973-07-03

Family

ID=13275244

Family Applications (1)

Application Number Title Priority Date Filing Date
US00166500A Expired - Lifetime US3742697A (en) 1970-07-27 1971-07-27 Driving arrangement for an electric watch

Country Status (5)

Country Link
US (1) US3742697A (fr)
CH (1) CH1098271A4 (fr)
DE (1) DE2137566B2 (fr)
FR (1) FR2099617B1 (fr)
GB (1) GB1343330A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908353A (en) * 1973-10-09 1975-09-30 Engler Instr Company Electric timepiece drive
JPS50136077A (fr) * 1974-03-09 1975-10-28
US4192131A (en) * 1977-01-19 1980-03-11 Kabushiki Kaisha Suwa Seikosha Step motor control mechanism for electronic timepiece
US4820940A (en) * 1984-03-12 1989-04-11 Sony Corporation Control circuits operating with pulse-width modulated signals
EP0388787A1 (fr) * 1989-03-24 1990-09-26 Asulab S.A. Pompe péristaltique miniature

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5740759B2 (fr) * 1973-07-17 1982-08-30
JPS5498677A (en) * 1978-01-11 1979-08-03 Citizen Watch Co Ltd Electronic watch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363410A (en) * 1966-01-25 1968-01-16 Suwa Seikosha Kk Apparatus for adjusting electric timepieces
US3534544A (en) * 1966-12-30 1970-10-20 Centre Electron Horloger Electronic watch
US3553957A (en) * 1966-02-10 1971-01-12 Peter Dome Electronic timepiece

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363410A (en) * 1966-01-25 1968-01-16 Suwa Seikosha Kk Apparatus for adjusting electric timepieces
US3553957A (en) * 1966-02-10 1971-01-12 Peter Dome Electronic timepiece
US3534544A (en) * 1966-12-30 1970-10-20 Centre Electron Horloger Electronic watch

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908353A (en) * 1973-10-09 1975-09-30 Engler Instr Company Electric timepiece drive
JPS50136077A (fr) * 1974-03-09 1975-10-28
JPS581394B2 (ja) * 1974-03-09 1983-01-11 株式会社東芝 キカイヒヨウジシキトケイソウチ ノ ケイスウカイロ
US4192131A (en) * 1977-01-19 1980-03-11 Kabushiki Kaisha Suwa Seikosha Step motor control mechanism for electronic timepiece
US4820940A (en) * 1984-03-12 1989-04-11 Sony Corporation Control circuits operating with pulse-width modulated signals
EP0388787A1 (fr) * 1989-03-24 1990-09-26 Asulab S.A. Pompe péristaltique miniature
FR2644853A1 (fr) * 1989-03-24 1990-09-28 Asulab Sa Pompe peristaltique miniature
US5083908A (en) * 1989-03-24 1992-01-28 Asulab S.A. Miniature peristaltic pump

Also Published As

Publication number Publication date
DE2137566B2 (de) 1977-09-29
FR2099617A1 (fr) 1972-03-17
DE2137566A1 (de) 1972-02-03
GB1343330A (en) 1974-01-10
FR2099617B1 (fr) 1975-02-07
CH1098271A4 (fr) 1974-10-15

Similar Documents

Publication Publication Date Title
US3560998A (en) Electronically controlled timepiece using low power mos transistor circuitry
US3930169A (en) Cmos odd multiple repetition rate divider circuit
US3664118A (en) Electronically controlled timepiece using low power mos transistor circuitry
US5493543A (en) Capacitive charge pump driver circuit for piezoelectric alarm
US3792577A (en) Quartz crystal wrist watch
US3864582A (en) Mosfet dynamic circuit
US4019178A (en) CMOS drive system for liquid crystal display units
US3742697A (en) Driving arrangement for an electric watch
US4063114A (en) Dynamic divider circuit
US3754391A (en) Driving arrangement for quartz vibrator timepieces
JPS6310612B2 (fr)
US3956880A (en) Solid state wristwatch with charge coupled divider
US3795098A (en) Time correction device for digital indication electronic watch
US3568091A (en) Astable multivibrator using two complementary transistor pairs
JPS6039193B2 (ja) 電子時計
GB1128050A (en) Improvements in electrical circuitry for timekeeping instruments
US3906256A (en) Drive pulse generator for use in electronic analog display clock apparatus
GB1214980A (en) Electronic watch
US3742698A (en) Circuit for quartz crystal timepiece
US3760580A (en) Binary divider circuit for electronic watch
US3645088A (en) Electronic timepiece
US3899691A (en) Driving circuits for electronic watches
US4173758A (en) Driving circuit for electrochromic display devices
US3922568A (en) Driving circuits for electronic watches
CH625671B (fr) Convertisseur electronique de frequence et piece d'horlogerie equipee de ce convertisseur.