JPS63134993A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To remarkably decrease current consumption by generating at least one or more driving pulses of a magneto-resistance element, between a driving pulse of a stepping motor and a driving pulse generated in the next time. CONSTITUTION:As for driving pulses P1, P2 of a magneto-resistance element and a detecting circuit, one or more pulses are generated between a driving pulse P3 of a stepping motor and a driving pulse P4 generated in the next time, and set so as not to be superposed on the motor driving pulses P3, P4. Accordingly, since the magneto-resistance element and an output signal detecting circuit of the magneto-resistance element are driven electrically by a pulse, the current consumption is decreased remarkably, and a battery of small capacity is enough. Also, since said pulse is not superposed on the driving pulse of the stepping motor, a sudden load on a MOSIC is avoided, therefore, the service life of the MOSIC is extended, and a load on a design is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic timepiece having a magnetic resistance element and a stepping motor configured so that there is no magnetic field detection direction.

[Conventional technology]

A conventional electronic watch with a magnetic resistance element is disclosed in Japanese Patent Application Laid-open No. 52-1.
Like 50070, it was only invented.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, since the magnetoresistive element is driven at a constant voltage, current consumption is large and a battery with a large capacity is required, resulting in a large battery size and an increase in the size of the entire watch. For this reason, it was impossible to incorporate it into the size of a wristwatch.

The present invention is intended to solve these problems, and its purpose is to provide an electronic timepiece that consumes less current and is smaller and thinner.

[Means for solving problems]

The electronic timepiece of the present invention is an electronic timepiece having a magnetic resistance element and a stepping motor, in which the magnetic resistance element and the output signal detection circuit t of the magnetic resistance element are pulse-driven, and the driving pulse is the same as the driving pulse of the stepping motor. The present invention is characterized in that the driving pulse is set so that at least one occurrence occurs between the driving pulse generated in the stepping motor and the driving pulse of the stepping motor does not occur once again.

[Implementation row]

FIG. 1 is a plan view of a timepiece according to an embodiment of the present invention, FIG. 2 is a sectional view of a circuit section according to an embodiment of the present invention, and FIG. 3 is a plan view of a circuit board according to an embodiment of the present invention. The same numbers indicate the same parts.

As shown in Fig. 1, the stator 3 and coil block 4 made of magnetic material, which constitute the entire magnetic path, are fixed with screws, guided by the pins δ and bushes planted on the base plate 2 made of metal or synthetic resin, for example. There is. A rotor, which is a component of the stepping motor, and a reduction gear train for displaying the hands are supported by a base plate 2 and a gear train bridge 5.

For example, a crystal resonator 9. Electronic device parts such as MO8 C7 and magnetoresistive element chip 9 are mounted. Hereinafter, one circuit board 6, referred to as a magnetoresistive element chip 9 and a total magnetoresistive element, is connected to a bottle 18 planted on the base plate 2.
Magnetoresistive element 9 mounted on one circuit board 6 which is guided by one circuit board and fixed with screws through one circuit board.
is the stator 3e that constitutes the magnetic path of the stepping motor.
It is arranged near the magnetic core 4α. In addition, the stator 3 and the coil block 4 formed by the 9-way t-11 resistance elements may intersect with each other in a plane.

As shown in FIG. 2, the stator 3 and coil block 4 are located on the upper part of the main plate 2 in cross section, and are fixed by screws through the pin 26t, the coil lead board 46, the circuit board 6, and the circuit board 10. Ru. The magnetoresistive element 9 is a lead pattern portion 1 of a copper foil pattern 11 formed on the ground plane side of the circuit board 6.
1α is bent down, subjected to conduction treatment, and fixed.

Note that the magnetoresistive element 9 may be fixedly attached in a pattern without bending down.The a1 magnetoresistive element 9 crosses the stator 3 and the magnetic core 4α, which constitute the magnetic path, in cross section. M
○8 C7 and magnetoresistive element 9ij: Covered with a synthetic resin 12 such as epoxy resin, both in terms of XfL and in cross section.

FIG. 3 1 Copper foil pattern 11 crimped onto circuit board 6
is a conduction path for supplying energy to the MOEi engineering C7 engineering water 7 vibrator, 81 inch air resistance element 9, and battery 1. Note that there may be a conduction path for testing, logic regulation, etc.

Electrical energy is supplied from the battery 1 to the MOEirC7, and the single oscillation signal generated by the crystal oscillator 8 is frequency-divided by a frequency dividing circuit to drive the stepping motor.

Torque is transmitted through a reduction gear train, and the hour, minute, and second hands display the time.

FIG. 4 shows a pulse characteristic diagram of the magnetoresistive element 9 and the detection circuit of this embodiment, and FIG. 5 shows a timing chart of drive pulses of the magnetoresistive element 9 and the detection circuit.

FIG. 4 shows a driving pulse P for the magnetoresistive element 9.

is set to be longer than the time T1 required for the magnetoresistive element to reach a stable state. This is because the output voltage is unstable before a stable state, making accurate detection impossible. Further, the drive pulse P1 of the magnetoresistive element 9 is a means for detecting an output signal of the magnetoresistive element constituted by, for example, an operational amplifier and an inverter. It is set shorter than the width of the electric pulse P of the detection circuit. Drive pulse P of the detection circuit! is set to a time of 12 or more for the detection circuit to reach a stable state. This is for the same reason as the driving pulse P1 of the magnetoresistive element 9. The drive pulse P1 for the magnetoresistive element is generated after the detection circuit reaches a stable state. Now, it will be explained why the drive pulse PK of the magnetoresistive element 9 is shorter than the drive pulse P2 of the detection circuit and is generated after the detection circuit reaches a stable state. The time T1 for the magnetoresistive element to reach a stable state is the time T1 for the detection circuit to reach a stable state! Therefore, the ratio detection circuit, which is constructed of, for example, an operational amplifier and an inverter, requires a current increase in order to shorten the time to reach a stable state. Therefore, it takes time 1 for the detection circuit to reach a stable state.
2 - Reduce current consumption by extending it to some extent. Then, if the magnetoresistive element is operated with the same drive pulse, the detection circuit will waste current during the time τ3 required to reach a stable state.

Therefore, the drive pulse P1 for the magnetoresistive element is generated after the detection circuit reaches a stable state. Then, the driving pulse P1 for the magnetoresistive element only needs to have a width that can be accurately detected by the detection circuit. Therefore, the drive pulse P1 of the 1M1 resistive element is the drive pulse P1 of the detection circuit! It's better to be short than that.

From FIG. 5, the driving pulse P of the fB magnetoresistive element detection circuit
s, Pstl stepping motor (7) drive pulse P
, and the next drive pulse P4, one or more occurrences occur, and the motor drive pulse ? ,, l'4 are set so that they do not overlap. Note that the drive pulse P1. of the F7B7 magnetoresistive element output circuit. P! can occur any number of times as long as it is one or more times. This is because if the motor drive pulse P4 is detected at least once in advance, it is possible to ensure Tanabata performance. When the body encounters an external magnetic field, the internal resistance of the magnetoresistive element 9 changes, resulting in a change in the output voltage. The output signal is amplified by a detection circuit and compared with a reference voltage.

Then, the switch is turned on. This signal is used as a signal to generate a sound or light as a warning means, a start signal for a measuring means such as a counter, a signal for switching pulse width as a means of manufacturing a counter, etc.

Note that the signal may drive anything.

FIG. 6 is a plan view of another embodiment according to the invention, and FIG. 7 is a cross-sectional view thereof, in which the same numbers indicate the same parts.

As shown in FIG. 6, the magnetoresistive element chip 9 is positioned in a plane near the magnetic material forming the magnetic path of the stepping motor. Hereinafter, the magnetoresistive element chip 9 will be referred to as a magnetoresistive element. The 5rlf air resistance resistors 9 are directly mounted on a coil lead board made of glass fiber-containing epoxy resin, polyimide resin, or the like. The coil lead board is a terminal treatment for the coil, which is a component made by motor controllers.

The magnetoresistive element 9 and the MO8 C7 are made of copper foil, which has been subjected to conduction treatment with <tar/11.

As shown in FIG. 7, the coil lead board 4b is directly mounted on the end of the 1Mi resistance element 9 which is fixed to the upper part of the magnetic core 4α, which is a component of the motor. Plate 1 (I has a hole in it so that it does not become heavy on the plane).

Note that the other structures and functions are the same as those of the above-mentioned embodiments.

According to this structure, it is possible to make the watch even thinner than in the embodiments described above.

〔Effect of the invention〕

As described above, according to the present invention, since the magnetoresistive element and the output signal detection circuit of the magnetoresistive element are pulse-electrified, the current consumption is significantly reduced, a battery with a small capacity is required, and the battery size is reduced. It is now possible to incorporate it into the size.

Also, it does not overlap with the driving pulse of the stepping motor (F), and avoids a sudden load on the MOEIC, reducing the lifespan of 1M081C and the load of Design 1.

The present invention is an indispensable driving method for an electronic timepiece having a magnetoresistive element.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a watch according to the present invention. FIG. 2 is a sectional view of a circuit section according to the present invention. FIG. 3 is a plan view of a circuit board according to the present invention. FIG. 5 is a pulse characteristic diagram of the magnetoresistive element and the detection circuit in the embodiment row of the present invention. FIG. 5 is a timing chart of the driving pulses of the magnetoresistive element and the detection circuit in the embodiment row of the present invention. FIG. Figure 7 is a cross-sectional view of another embodiment of the present invention. and applicant Seiko Epson Corporation 4! . melody side

Claims (1)

[Claims] In an electronic timepiece having a magnetoresistive element and a stepping motor, the magnetoresistive element and the output signal detection circuit of the magnetoresistive element are pulse-driven, and the drive pulse is the same as the drive pulse of the stepping motor and the next drive pulse. An electronic timepiece characterized in that the electronic timepiece is set so that at least one pulse occurs during the interval and does not overlap with the drive pulse of the stepping motor.