JPH0783582B2 - Flat type vibration motor, card type pager and wrist watch type information transmission device using the flat type vibration motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a flat type vibration motor that is a brushless motor and that can obtain high reliability and a long life, and a card type pager and a wrist watch type using the flat type vibration motor. The present invention relates to an information transmission device. The "wristwatch-type information transmitting device" in the present invention means a pager, a timepiece for notifying a time signal and an alarm, a signal receiver for transmitting information by transmitting vibration to a human body, and the like.

Further, the flat type vibration motor of the present invention is made variable in its strength or frequency so that the user of the card type pager or wristwatch type information transmission device can receive the information in the most comfortable state. It is the one.

[Conventional technology]

A flat vibration motor is a pager that changes to a pager and transmits vibrations based on its rotation to the human body without disturbing the surroundings and transmitting information to the human body, an information transmission device including a clock, or a signal for the blind. Used in receivers, etc.

For example, FIG. 4 is a schematic sectional view of a flat type brushless motor in a conventional example.

In FIG. 4, a printed wiring board 1 ′ having a plurality of stator coils 2, for example, 3 phase 6 coils formed thereon is placed on a stator yoke substrate 1, and a bearing 3 is mounted at the center thereof. Has been done. The stator yoke substrate 1 also serves as a motor case made of a magnetic material, and the motor case is omitted in the upper part of the drawing.

A shaft 4 is rotatably inserted in the bearing 3.
A plate-shaped rotor magnet 7 is fixed to the shaft 4 via a rotor bush 5. The rotor magnet 7 is magnetized into a desired number of magnetic poles, for example, 8 poles,
It faces the stator coil 2.

The flat brushless motor having such a configuration detects the position of the rotor magnet 7 and causes the rotor magnet 7 to generate a rotational force by a control circuit (not shown) that sequentially generates a rotating magnetic field in the stator coil 2.

When a rotary vibration device is obtained by using the flat type brushless motor as described above, an eccentric weight having a high specific gravity such as tungsten is attached to the rotary shaft of the motor to generate vibration.

In addition, the vibration motor generates rotary vibration by eccentricizing the rotor magnet 7, changing at least one size of the stator coil 2, or eccentric arrangement (removing at least one coil). Was there.

Details of the vibration motor are described in, for example, JP-A-1-164254.
And JP-A-2-17843.

[Problems to be Solved by the Invention]

However, there is a problem that expensive tungsten must be used in order to increase the specific gravity of the weight in order to make the shape of the vibration motor in which the weight is cut out and the vibration is generated due to the imbalance of the mass to be small and flat. .

Further, the motor that thins out the rotor magnet or the coil to generate the vibration as described above sacrifices the rotational torque, and thus requires a larger current by the torque corresponding to the sacrifice. Furthermore, in order to generate a large amount of vibration, the vibration motor must have its rotation speed set to several thousand rpm, and therefore, a current consumption of several hundred mA is required.

As described above, the vibration motor having a high rotation speed consumes a large amount of current, and the iron loss generated in the stator yoke increases (the hysteresis loss is proportional to the rotation speed, and the eddy current loss is proportional to the square of the rotation speed). However, there is a problem that mechanical life is generated or the life of the bearing is reduced due to wear of the bearing.

Further, the short-period vibration generated by the high-speed rotation has a larger attenuation than the long-period vibration, and has a problem that the vibration transmission efficiency is poor.

When the vibration motor as in the conventional example is used flat in a card-type or wristwatch-type pager, a signal receiver for the blind, or the like, there is no battery for supplying current for high-speed rotation. For example, flat type lithium batteries such as button type or brushless motors comparable to this size have been developed. However, it was not possible to use a lithium battery with a rated current of tens of mA for a vibration motor using a conventional brushless motor.

The present invention is for solving the above problems,
It is an object of the present invention to provide a flat type vibration motor that extends the life of the battery and the motor by low current consumption and low speed rotation, and that has good vibration transmission efficiency.

It is an object of the present invention to provide a card type pager and a wristwatch type information transmission device using a flat type vibration motor having substantially the same shape as a lithium battery.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a card type pager and a wristwatch type information transmission device capable of adjusting the vibration frequency and the intensity of vibration so that the user can easily transmit the vibration.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a flat type vibration motor of the present invention includes a rotor back yoke having a plate-shaped rotor magnet and a shaft attached thereto, and a stator coil provided so as to face the plate-shaped rotor magnet. A control circuit for mounting the stator coil and the bearing, and a stator yoke substrate arranged to face the rotor magnet so as to form a gap, and a control circuit for sequentially generating a rotating magnetic field in the stator coil by detecting the position of the rotor magnet. And a magnetic force variation means for changing the gap between the magnetic attraction projection and the rotor magnet, and a frequency variation means for detaching the magnetic attraction projection. And are provided.

The card type pager and the wristwatch type information transmitting device for transmitting information including the time signal and / or the alarm of the present invention transmits information using the vibration of the flat type vibration motor to the user.

A card type pager and a wristwatch type information transmitting device for transmitting information including a time signal and / or an alarm according to the present invention include a flat type vibration motor having a frequency of 1 to 10 times per second.
It is characterized by being done within the number of times.

[Action]

By detecting the position of the rotor magnet, currents having different phases generated in the control circuit are applied to the stator coil via the lead wires. The rotor back yoke rotates together with the rotor magnet by the rotating magnetic field due to the current applied to the stator coil and the magnetic force of the rotor magnet. The magnetic attraction protrusion is formed on the stator yoke substrate with the rotor magnet interposed therebetween. The magnetic poles formed on the rotor magnet are attracted and do not rotate smoothly when approaching the magnetic attraction protrusion. That is, the rotor back yoke to which the rotor magnet is attached rotates while vibrating. Further, the vibration during rotation is determined by the number of magnetic poles and magnetic attraction projections.

Further, the strength of vibration is changed by changing the gap between the rotor magnet and the magnetic attraction protrusion. The card type pager or wristwatch type information transmission device using such a flat type vibration motor can be adjusted in its vibration frequency or its strength as desired, so that it can be adjusted to the most comfortable state for the user.

〔Example〕

FIG. 1 is a schematic sectional view of a flat vibration motor according to the present invention,
2 and 3 are schematic sectional views of other flat type vibration motors according to the present invention. 1 to 3,
The same parts as those of the flat motor shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference between the flat motor shown in FIGS. 1 to 3 and the flat motor shown in FIG. 4 lies in the magnetic attraction protrusion of the stator yoke substrate 1.

That is, as described in [Prior Art], the stator yoke substrate 1 constitutes a part of the motor case, and the magnetic attraction projection is formed in this part. Further, the stator yoke substrate 1 is made of a soft magnetic material, and is extruded or cut and raised as indicated by reference numeral 8 in order to form the magnetic attraction protrusion. Further, the magnetic attraction protrusion 8 may be formed in a space formed between the stator coils 2. In addition, the magnetic attraction projection 8
Can also be formed on the printed wiring board 1 ′ for forming the stator coil 2.

Further, in the modification of the magnetic attraction projection, the magnetic pole attraction plate 9 can be adhered as shown in FIG. Also,
As shown in FIG. 3, the magnetic pole attracting screw 10 is made of a magnetic material and has a recess 11 formed in a part of the stator yoke substrate 1.
It is inserted into a screw (not shown) while rotating. When the gap between the tip of the magnetic attraction screw 10 and the rotor magnet 7 is adjusted by the rotation of the magnetic attraction screw 10, the strength of vibration changes. The frequency can be changed by attaching or removing at least one of the plurality of magnetic attraction screws 10.

Since the magnetic attraction protrusions 8 to 10 formed on the stator yoke substrate 1 are arranged close to the rotor magnet 7 via the gap, the magnetic attraction force of the rotor magnet 7 causes the motor to rotate. Give imbalance. That is, the magnetic poles (not shown) formed in the rotor magnet 7 are the magnetic attraction protrusions 8 or
Since it is magnetically attracted every time it passes through 10, vibration is given to the rotation of the motor. Therefore, the strength of vibration is determined by the gap between the magnetic attraction projections 8 to 10 and the rotor magnet 7, and is adjusted by moving the magnetic attraction screw 10 as shown in FIG.

The frequency of the motor is magnetically attracted every time the magnetic poles formed on the rotor magnet 7 pass through the magnetic attraction projections 8 to 10, so that the magnetic attraction projections formed on the stator yoke substrate 1 are attracted. It depends on the number of 8 to 10 and the number of magnetic poles formed on the rotor magnet 7. That is, frequency = magnetic attraction projection number × magnetic pole number × rotation number.

In the flat type vibration motor as described above, the position of the rotor magnet 7 is detected by a control circuit (not shown),
Currents having different phases are sequentially given to the stator coil 2 through the lead wires. The rotor back yoke 6 is rotated together with the rotor magnet 7 by the rotating magnetic field generated by the current applied to the stator coil 2 and the magnetic force of the rotor magnet 7. The flat type vibration motor of the present invention vibrates due to the magnetic attraction force without using the unbalance of the weight or the mass of the coil, the magnet, etc., so that the current consumption is small and the low speed rotation is possible. It was

That is, the comparison between the conventional vibration motor and the flat type vibration motor of the present invention is as follows.

An example in which the flat type vibration motor as described above is used in, for example, a card type pager or a wristwatch type information transmission device will be described.

The card-type pager is an alternative to a pager, and the wristwatch-type information transmitting device is a wristwatch that transmits information including a time signal and / or an alarm to a human body by vibration, a signal receiving device for a blind person, etc. It conveys information without being noticed.

According to the present invention, since the magnetic attraction protrusion is formed by utilizing the space formed in or around the stator coil without using the weight, it is possible to make it compact, that is, substantially the same shape as the lithium battery. At the same time, since the current consumption is reduced, lithium batteries can be used. For this reason, for the first time, a lithium battery and a flat vibration motor having substantially the same shape as the lithium battery can be accommodated in a card-type pager or a wristwatch-type information transmission device at the same time.

Further, since the flat vibration motor of the present invention can change the frequency and the strength thereof, the card type pager or the wristwatch type information transmission device having the flat vibration motor built-in feels comfortable to the user. Easy frequency and its strength can be selected.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the present invention described in the claims.

Needless to say, well-known technical means other than the embodiments described in the specification can be used for the shape of the magnetic attraction projection, the shaping means, and the means for changing the gap between the magnetic attraction projection and the rotor magnet.

〔The invention's effect〕

According to the present invention, it is not necessary to provide a weight, thin a coil, or cut out a magnet in order to generate an imbalance in mass, so that the torque generation efficiency is good.

Further, for the above reason, since it can rotate at a low speed, it has many advantages such as low current consumption, low iron loss, long life, and low mechanical noise.

Furthermore, low-cycle vibration due to low-speed rotation is less damped,
It has good vibration transmission efficiency and is suitable for pagers and wristwatch type information transmission devices. In particular, the card-type pager and wristwatch-type information transmitting device using the flat vibration motor of the present invention is convenient because the user can arbitrarily select the vibration frequency or vibration strength that is most comfortable.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a flat vibration motor according to the present invention,
2 and 3 are schematic sectional views of another flat type vibration motor according to the present invention, and FIG. 4 is a schematic sectional view of a flat type brushless motor in a conventional example. 1 ... Stator yoke substrate 1 '... Printed wiring board 2 ... Stator coil 3 ... Bearing 4 ... Shaft 5 ... Rotor bush 6 ... Rotor back yoke 7 ... Rotor magnet 8 ... Magnetic attraction protrusion 9 ... … Magnetic attraction plate 10 …… Magnetic attraction screw 11 …… Concave

Claims (5)

[Claims] 1. A rotor back yoke 6 having a plate-shaped rotor magnet 7 and a shaft 4 attached thereto, a stator coil 2 provided so as to face the plate-shaped rotor magnet 7, a stator coil 2 and a bearing 3. And attach and
The stator yoke substrate 1 is arranged to face the rotor magnet 7 so as to form a gap, and a control circuit that sequentially generates a rotating magnetic field in the stator coil 2 by detecting the position of the rotor magnet 7. In the flat type vibration motor, a magnetic attraction projection portion is provided on the stator yoke substrate 1, a vibration strength varying means for changing a gap between the magnetic attraction projection portion and the rotor magnet 7, and a vibration in which the magnetic attraction projection portion is detachable. A flat-type vibration motor comprising: a variable number means; 2. A card type pager using the flat type vibration motor according to claim 1. 3. A wristwatch type information transmitting device for transmitting information including a time signal and / or an alarm, which uses the flat type vibration motor according to claim 1. 4. The card-type pager according to claim 2, wherein the frequency of the flat vibration motor is set to 1 to 10 times per second. 5. The wristwatch-type information transmission device according to claim 3, wherein the frequency of the flat vibration motor is set to 1 to 10 times per second.