JPS63135889A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To achieve a smaller size and a less thickness of a timepiece, by arranging a magnetoresistance element in the direction of minimizing the magnetic field resisting capacity of a stepping motor and near a member made of a magnetic material composing a magnetic path on a plane. CONSTITUTION:A magnetoresistance element 9 mounted on a circuit board 6 is arranged in the direction of detecting the direction in which the magnetic field resisting capacity of a stepping motor is at its minimum with the max. sensitivity and near a stator 3 and a magnetic core 4a composing a magnetic path of the stepping motor. A lead pattern section 11a of a copper foil pattern 11 formed on the ground plate side of the substrate 6 is bent down and a conduction processing is applied to fasten the element 9. In this manner, the element 9 is mounted on the substrate 6 and a coil lead substrate 4b. This enables the arrangement of the element within a movement without degrading the performance thereof 9 thereby achieving a smaller size and a less thickness of a timepiece as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic timepiece having a magnetoresistive element with an @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.
It was something invented like 50070.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the magnetoresistive element is equipped with a molding agent and lead terminals, so the element itself is large.
Also, since it cannot be placed inside the movement, it has to be placed between the case and the movement, which makes the entire watch larger.
The cross-sectional dimensions were determined by the thickness of the element.

Furthermore, it is difficult to arrange it near the stepping motor and in the weakest direction, so it cannot follow the motor performance and cannot satisfy the original purpose. Further, the conduction process between the FFI resistance element terminal and the lead wire of the circuit section is complicated, and mass production is not possible.

The problem is that the element fixing structure is difficult to remove and the reliability of conduction due to disturbances is low. Therefore, the present invention is intended to solve this further problem, and its purpose is to provide a highly reliable, small and thin timepiece that follows the performance of the motor.

[Means for solving problems]

The electronic timepiece of the present invention is an electronic timepiece having a magnetic resistance element stepping motor with a magnetic field detection direction, and in which the magnetic resistance element is placed in the direction of the weakest magnetic field resistance of the stepping motor. An electronic timepiece characterized in that an electronic timepiece is arranged in a plane near a member.

〔Example〕

FIG. 1 is a plan view of a watch according to the present invention, FIG. 2 is a sectional view of a circuit section of the present invention, and FIG. 3 is a plan view of a circuit board according to the present invention. Sh.

Identical numbers indicate identical parts.

As shown in Figure 1, when fed, it is guided by pins 5 planted on the base plate 2 made of metal or synthetic resin, etc., and the stator 3 and coil block 4 made of magnetic material that make up the - path are fixed with screws. 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, the circuit board 6 made of polyimide or glass fiber-containing epoxy resin may include a crystal resonator 89M0BXCT,
Electronic device components such as @air resistance element chip 9 are mounted. Hereinafter, the a-type resistance element 9 will be referred to as a magnetoresistive element.1 The circuit board 6 has a pin 18 planted on the ground plate 2.
The magnetic resistance element 9fi mounted on the circuit board 6 is guided by the circuit board 10 and fixed by screws through the circuit board 10, and the direction of the weakest magnetic field resistance (arrow) of the stepping motor is the maximum sensitivity. The stator 3 and the magnetic core 4a are arranged in the direction of detection and constitute the entire magnetic path of the stepping motor.
It is placed near . Note that the magnetoresistive element 9 has a magnetic path t
- It may intersect with the stator 3 and coil block 4 in a plane.

From the second frame, the stator 30 and the coil block 4 are located on the upper part of the main plate 2 in cross section, and the pin 26 and the coil lead board 4 are located on the upper part of the main plate 2.
b. The six circuit boards are each fixed with screws via circuit holding plates lO. The magnetoresistive element 9 is a lead pattern portion 11 of a copper foil pattern 11 formed on the ground plate side of the circuit board 6.
A 1 is bent down, conductive treatment is applied, and it is fixed.

Note that the magnetoresistive element 9 may be directly fixed to a pattern without bending down.
The MRO S C7 and the magnetoresistive element 9 are covered with a synthetic resin 12 such as epoxy resin both in plan and in cross section.

Fig. 3 Copper foil pattern 11 crimped onto circuit board 6
is a conduction path for supplying electrical energy from MOE C7, crystal oscillator 8, magnetoresistive element 9, and battery l. Note that there may be a conduction path for testing, logic regulation, etc.

Electrical energy is supplied from battery 1 to MO8O8 construction area 7,
The single oscillation signal oscillated by the crystal oscillator 8 is frequency-divided by a frequency dividing circuit and drives a stepping motor.

Torque is transmitted by a constant train of wheels, and the hour and minute second hands display the time.

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

From FIG. 4, the driving pulse P of the magnetoresistive element 9.

is set to be longer than the time required for the magnetoresistive element to reach a stable state. This is because the voltage is unstable under stable conditions, making accurate detection impossible. Further, the drive pulse PlnPJ of the magnetoresistive element 9 is set to be shorter than the width of the drive pulse P2 of a detection circuit which is means for detecting the output signal of the magnetoresistive element constituted by an operational amplifier, an inverter, etc. Detection circuit drive pulse P2
teeth.

This is set to be longer than the time T1 for the detection circuit to reach a stable state. This is for the same reason as the drive pulse P1 of the magnetoresistive element 9. Then, the driving pulse P of the magnetoresistive element
1 occurs after the detection circuit reaches a stable state. Now, it will be explained why the drive pulse P1 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 T for the magnetoresistive element to reach a stable state is the time T for the detection circuit to reach a stable state.
Therefore, a detection circuit composed of, for example, an operational amplifier inverter, etc., requires a total current length to shorten the time to reach a stable state. For this reason, the time Tzt for the detection circuit to reach a stable state is extended to some extent and the current consumption is reduced.Then, if the magnetoresistive element is activated by the same drive pulse, the time it takes for the detection circuit to reach a stable state is wasted. Therefore, after the detection circuit reaches a stable state, it generates the drive pulse P1 for the magnetoresistive element.Then, the drive pulse P1 for the magnetoresistive element is generated.
1 is sufficient to have a width that can be accurately detected by the detection circuit. Therefore, the drive pulse P1 of the magnetoresistive element needs to be shorter than the drive pulse P2 of the detection circuit.

From Fig. 5, the driving pulse I' of the magnetoresistive element and the detection circuit is
l, P, are generated one or more times between the stepping motor drive pulse P3 and the next drive pulse P4, and the motor drive pulse P3. It is set so that it does not overlap with P. Note that the drive pulse p1 of the EB magnetoresistive element detection circuit
．． P2 may be generated as many times as it is one or more times. This is because if the motor drive pulse P4 is detected at least once in advance, the performance of the motor can be ensured1.
When the watch body encounters an external magnetic field, the internal resistance of the magnetoresistive element 9 changes, causing a change in the output voltage. The output signal is amplified by a detection circuit and compared with a reference voltage.

Then the switch turns 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, or a pulse width switching signal as a means for making the structure resistant. In addition, how many t-
It may be driven.

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

As shown in Figure 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 total magnetoresistive element. If the magnetoresistive elements 9 are lined up, the glass g! It is directly mounted on a coil lead board made of fiber-filled epoxy resin or polyimide resin in a direction that allows detection of the weakest magnetic resistance of the motor with maximum sensitivity. The coil lead board has the terminals of the coil, which is a component of the motor, processed.

The magnetoresistive element 9 and the MO8 C7 are made of copper foil (T-conducting treatment is applied at the turn 11).

As shown in FIG. 7, the coil lead board 4b is fixed to the upper part of the magnetic core 4α, which is a component of the motor. The magnetoresistive element 9 is directly mounted on the upper part of the coil lead board, and the circuit board 6 and the circuit part board 1 (J are provided with holes that are clear so as not to add weight in a plane).

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

According to this FIIIa, it is possible to make the watch even thinner than the above embodiment.

〔Effect of the invention〕

As described above, according to the present invention, the magnetoresistive element is mounted on the circuit board and the coil lead board.
This enabled the elements to be placed inside the movement without compromising their performance, allowing the entire watch to become smaller and thinner.

Furthermore, the conduction process between the element and the lead wire of the circuit section has been improved, which improves the reliability and mass productivity of conduction caused by external disturbances.

In addition, because the a-resistance element is placed in the direction of the stepping motor's weakest anti-magnetic performance and near the magnetic path component, even a low-sensitivity element can perform detection that closely follows the motor performance. The aim was to improve operational reliability.

The present invention will become an indispensable structure in future electronic watches that include directional magnetoresistive elements.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a watch according to an embodiment of the present invention. FIG. 2 is a sectional view of a circuit section of an embodiment of the present invention. FIG. 3 is a plan view of a circuit board according to an embodiment of the present invention. FIG. 5 is a pulse characteristic diagram of the magnetoresistive element and the detection circuit in the 7M row of the present invention. FIG. Plan view FIG. 7 is a sectional view 2 of another implementation row of the present invention - Base plate 7... MO8 work C3φ0. Stator 9・e 晦1i13. Air resistance element 4...
fill block

Claims (1)

[Claims] In an electronic watch having a magnetic resistance element with a magnetic field detection direction and a stepping motor, the magnetic resistance element is placed in the direction of the weakest magnetic resistance of the stepping motor and in the vicinity of a member made of a magnetic material constituting a magnetic path. An electronic clock that is characterized by its central location.