JPH0528465U - Vibration generator - Google Patents

Abstract

(57) [Summary] [Purpose] An object is to provide a vibration generator for a vibration alarm that is generated by electromagnetic force and is used for a pager, a mobile phone, etc., having a simple structure. [Structure] On both sides or one side of an electromagnetic coil 4 having a coil wound around a coil bobbin 3, the inner surface of the electromagnetic coil is magnetized in the axial direction of the electromagnetic coil from the inner diameter of the electromagnetic coil, and at least 2 facing each other in the direction perpendicular to the axial direction. Case 7 by the leaf spring 2 in the direction
The permanent magnet 1 held and fixed to the power supply device 6 for generating an alternating magnetic field in the electromagnetic coil is built in the case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration generator using electromagnetic force for a vibration alarm used in pagers and mobile phones.

[0002]

[Prior Art]

 Conventionally, this type of vibration generator vibrates by attaching a cylindrical coreless motor 11 of about 7 mmφ × 23 mm as shown in FIG. 3 and a weight 12 made of segmented tungsten to its rotation shaft with the rotation axis center removed. However, there was a drawback that it was expensive.

[0003]

[Problems to be solved by the device]

 In order to eliminate these drawbacks, the present invention obtains vibration by electromagnetic force, and an object thereof is to provide an inexpensive vibration generator having a simple structure.

[0004]

[Means for Solving the Problems]

 According to the present invention, a permanent magnet is fixedly arranged at both ends or one end of an electromagnetic coil wound around a coil bobbin, and at the center of a leaf spring fixed at both ends facing the inner surface of a case enclosing a vibration generator. When an alternating current such as a pulse wave or a square wave is applied to the electromagnetic coil, the permanent magnet facing the electromagnetic coil is attracted by the action of the alternating magnetic field generated in the electromagnetic coil by the current flowing in the electromagnetic coil. By repulsing and vibrating the permanent magnet, the case surface at the other end of the spring connected to the permanent magnet is vibrated to form a vibration generator.

That is, the present invention is as follows. On both sides or one side of the electromagnetic coil in which the coil is wound around the coil bobbin, the leaf spring is magnetized in the axial direction of the electromagnetic coil from the inner diameter of the electromagnetic coil to the outer side of the end face, and the leaf spring is formed in at least two directions perpendicular to the axial direction. The vibration generating device is characterized in that a permanent magnet held and fixed by the case and a power supply device for generating an alternating magnetic field in the electromagnetic coil are attached and formed in the case. 2. The vibration generator according to claim 1, wherein a weight is attached integrally with the permanent magnet.

[0006]

[Action]

 In the alternating magnetic field created by the electromagnetic coil fixed to the case by a support, the opposite poles supported from four sides by the leaf springs, which are opposite to the electromagnetic coil and fixed to the case, are magnetized to different magnetic poles. Since the permanent magnets are placed inside the permanent magnet, the alternating magnetic field on the end surface of the electromagnetic coil causes the permanent magnets to repel and attract in the same direction, and the case made of elastic and deformable material responds to the vibration of the permanent magnets. Then, it is pulled by the leaf spring and a flexural vibration is generated on the outer circumference of the case. As described above, the vibration generating device according to the present invention has a structure in which the vibration caused by the interaction between the magnetic field created by the electromagnetic coil and the permanent magnet is directly transmitted to the case, so that the vibration is very efficiently formed. Also, by lowering the vibration frequency and attaching a weight with a large specific gravity together with the permanent magnet, it is possible to further increase the amplitude of flexural vibration on the case surface.

[0007]

【Example】

 FIG. 1 is a cross-sectional view showing an embodiment of a vibration generator according to the present invention, in which a coil bobbin 3 is wound around a coil to form an electromagnetic coil (hereinafter referred to as coil) 4, and both ends thereof have a magnetization direction. The permanent magnet 1 is fixed to the leaf spring 2 by a brazing adhesive or the like so as to be parallel to the coil center axis, and the leaf spring 2 is fixed to the case 7 in at least two directions of the coil end face direction. The permanent magnets are oriented toward the center of the coil axis from both sides of the electromagnetic coil in the direction of the center axis of the coil with the plane of the leaf spring as the back. Regarding the magnetism of the permanent magnets attached to both ends of the coil, the N pole and S pole face each other in the coil center direction. When an alternating magnetic field is applied to the coil, the permanent magnet is repulsively attracted by the end faces of the coil, and Since the other end of the leaf spring brazed to is fixed to the case 7 on all sides, the vibration of the permanent magnet is immediately transmitted to the case. The alternating current supplied to the coil is mounted on the power supply device 6 in the case, and the alternating current is supplied to the coil by the lead wire 13. The power supply device includes a battery, an oscillation circuit, a frequency dividing circuit, and a power amplification circuit. Naho vibration frequency can be adjusted through the adjustment hole 9 for frequency adjustment. By attaching a weight 10 having a large mass to the Naho permanent magnet, a large amplitude can be obtained at low frequencies. In addition, FIG. 2 shows a structure in which a magnetic yoke 5 made of a soft magnetic material is attached to the inner peripheral portion of the coil. With this structure, a stronger vibration amplitude can be obtained as compared with FIG. The electrodes of the permanent magnet may have either N pole and N pole facing each other or N pole and S pole facing each other. If a small shape is required, the permanent magnet is arranged only at one end of the coil. May be By passing a pulse wave-shaped alternating current or a square wave current through the coil of the vibration generator configured as described above, the alternating magnetic field generated inside the coil and the magnetized permanent magnet interact with each other. Vibration is generated directly on the case surface via the leaf spring.

[0008]

[Effect of the device]

 As described above, the vibration generator according to the present invention has a simpler structure than the coreless motor conventionally used in this type of vibration generator, and can greatly reduce the manufacturing cost. Moreover, the vibration generator according to the present invention can be easily miniaturized, and can be used for a vibration alarm of a pocket bell, a mobile phone, or the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a vibration generator according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the vibration generator according to the present invention.

FIG. 3 is an external perspective view of a conventional vibration generator.

[Explanation of symbols]

 1 Permanent Magnet 2 Leaf Spring 3 Coil Bobbin 4 Electromagnetic Coil 5 Magnetic Yoke 6 Power Supply 7 Case 8 Support 9 Adjustment Hole 10 Weight 11 Coreless Motor 12 Weight 13 Conductor

Claims (2)

[Scope of utility model registration request] 1. A magnetic bobbin is wound on both sides or one side of an electromagnetic coil, and is magnetized in the axial direction of the electromagnetic coil from the inner diameter of the electromagnetic coil to the outside of the end face, and at least two facing each other in the direction perpendicular to the axial direction. 1. A vibration generator, comprising: a permanent magnet fixed to a case by a leaf spring in a predetermined direction; and a power supply device for generating an alternating magnetic field in the electromagnetic coil mounted inside the case. 2. The vibration generator according to claim 1, wherein a weight is attached integrally with the permanent magnet.