JPH0340727A - Timepiece provided with electromagnetic induction changing apparatus - Google Patents

Abstract

PURPOSE:To shorten charging time while keeping correct motion of hands by applying external magnetic field having such frequency as causing no erroneous function of indication ring drive motor and including maximum voltages in the primary and induction coils within this frequency range. CONSTITUTION:An induction coil 1 is preferably wound around a long core in view point of the number of turn. A circuit block 2 is connected through a coil lead substrate with the induction coil 1 and a coil block 4. External magnetic field is applied from the outside of a rear cover 6 through a primary coil facing with the laminated sections at the opposite ends of the induction coil 1. Characteristics of the induction coil 1 are set such that maximum electromotive force is produced upon application of external magnetic field having such frequency band as causing no erroneous function of coil row drive motor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic induction rechargeable timepiece in an analog display electronic timepiece.

[Summary of the invention]

In addition to the coil block of the display wheel train drive motor, the analog display electronic timepiece is equipped with an induction coil that is set so that the induced power is maximized in an external magnetic field in a frequency band that does not cause the display wheel train drive motor to malfunction. An electromagnetic induction charging timepiece having a charging system that applies an external magnetic field to the induction coil and stores the induced power generated at that time.

[Conventional technology]

Conventional technology attempts to determine the driving frequency of the -order coil so that an optimal induced power can be obtained by combining a primary coil that applies an external magnetic field and an induction coil. According to the official bulletin.

[Problem to be solved by the invention]

However, in the above configuration, there is no configuration that indicates the setting of the number of turns of the primary coil or induction coil when an external magnetic field in a frequency band that does not cause malfunction is applied to the display wheel train drive motor.

(Means for Solving the Problem) In order to solve this problem, in the present invention, the external magnetic field is applied with a frequency that does not cause the display wheel train drive motor to malfunction, and at the same time, the -order coil and the induction coil are The maximum induced voltage is generated within the range.

[Effect]

By setting tlI as described above, the frequency of the external magnetic field is set to a frequency band that does not cause malfunction of the display wheel train drive motor, so that charging can be performed without the pointer going out of order even during charging, and the induction coil By adjusting the specifications to the frequency band mentioned above, it was possible to generate maximum power and shorten charging time.

〔Example〕

Examples of the present invention will be described in detail below. 1st
In the figure, in addition to a motor coil block 4 for driving a display wheel train, an induction coil 1 for charging is arranged in the movement. As shown in FIG. 2, magnetic material 9 is laminated on both ends of the magnetic core of the induction coil 1 to close the gap with the back cover 6. The coil pro 4 of the display wheel train drive motor and the induction coil 1 are arranged in a non-parallel manner so that the directions of their magnetic fluxes are not the same. The circuit block 2 is electrically connected to the induction coil 1" and the coil block 4 via a coil lead board. The external magnetic field is , as shown in FIG. 2, is provided by a primary coil 11 facing the laminated portions 9a at both ends of the induction coil l from the outside of the back cover 6. Each characteristic is centered so that the maximum electromotive force is generated when subjected to an external magnetic field.Figure 4 shows a primary coil with 1000 turns.
Occurs when a voltage of 2V is applied. The malfunction rate of the wheel train drive motor with respect to the frequency of the external magnetic field is shown.
The rotor has a magnet with a magnetic flux density of mega erstesod, and the gap between the stator and the magnet is 0.4 mm. For such display wheel train drive motor, 60011z
This shows that there is no effect on operation when an external magnetic field in the above frequency band is applied. Further, the induced voltage and induced 'XIt current generated in the induction coil at this time are as shown in FIGS. 4 and 5.

The induced voltage shown in Figure 4 increases in proportion to the ratio of the number of turns of the induction coil to the number of turns of the primary coil, and the induced power reaches its peak when the frequency of the alternating current flowing through the secondary coil is between 200Hz and 500Hz. At frequencies above Hz, it has a characteristic of gently decreasing. On the other hand, as shown in Figure 5, the induced current is 20
It reaches a peak near 0 Hz, and at frequencies higher than that, it draws a quadratic curve and descends, and is inversely proportional to the number of turns of the induction coil. From the above, when increasing the number of turns of the induction coil with respect to the primary coil, the induced voltage increases, but on the other hand, the induced current decreases.In an external magnetic field with a frequency of 600Hz or higher, the -order coil has about 1000 turns per induction. 400 coils
It can be seen that a combination with approximately 0 turns of 1 is optimal.

〔Effect of the invention〕

According to the embodiment, since the back cover and the induction coil are close to the magnetic field applied from the outside through the back cover, the magnetic field can be strongly received, and a larger electromotive force can be generated. The induction coil and the coil block of the gear train drive motor are arranged so that the maximum electromotive force can be obtained without interfering with the arrangement or the characteristics with respect to the frequency of the external magnetic field, and charging can be performed without disturbing the needle display. Become.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view showing an embodiment of the invention, Fig. 3 is an explanatory diagram of the malfunction rate of the wheel train drive motor with respect to external magnetic field frequency, FIG. 4 is a characteristic diagram of induced voltage with respect to the number of turns of the induction coil, and FIG. 5 is a characteristic diagram of induced current with respect to the number of turns of the induction coil. Induction coil circuit block capacitor Wheel train drive motor coil block base plate 6 ・ ・ 7 ・ ・ 8 ・ ・ 9 ・ ・ IO ・ 11 ・ ・ ・Back cover・Magnetic material set screw・Induction coil set screw・Magnetic material・Lead board・−Next coil

Claims (1)

[Claims] In an analog display electronic watch that has means for storing the generated power in a charging element when an induction coil inside the watch is induced by electromagnetic induction from outside the watch, the primary power source is driven by converting the frequency of the commercial power source. The alternating magnetic field applied from outside the watch by the coil is applied at a frequency that does not cause the display wheel train drive motor inside the watch to malfunction, and the case has at least one induction coil whose induced power is maximum near the frequency. A watch with an electromagnetic induction charging device.