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Electromagnetic sound exchanger of flat vibration brushless motor

A vibrating motor, flat type technology, applied in the direction of sensors, electrical components, etc., can solve the problems of rotor magnet influence, trouble, etc., and achieve the effect of less leakage magnetic field and sufficient fixing strength

Inactive Publication Date: 2006-02-08
TOKYO PARTS IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, such a thin brushless motor creates troublesome problems when incorporated into an electromagnetic acoustic transducer
That is, in order to increase the sound pressure, a magnet with a strong unipolar magnetic field such as a neodymium magnet is used for the field magnet of the speaker, but it will have a large influence on the rotor magnet of the motor.
Therefore, in the type that uses one hall sensor in the arrangement volume, it will have a bad influence on the static torque (detent) generating parts, including starting problems.

Method used

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  • Electromagnetic sound exchanger of flat vibration brushless motor
  • Electromagnetic sound exchanger of flat vibration brushless motor
  • Electromagnetic sound exchanger of flat vibration brushless motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The electromagnetic acoustic transducer S of the present invention includes: a shallow cylindrical resin speaker case 1; a flat vibrating motor M arranged in the center and incorporating an eccentric rotor; An annular movable voice coil 2 in the shape of a multi-layer solenoid; a film-like vibrating plate 3 made of synthetic resin mounted on the above-mentioned casing with one end of the coil installed; The annular field magnet 4 that is assembled on the above-mentioned casing with the gap. The end 2a of the movable voice coil 2 is attached to the vibrating thin plate 3 by bonding or the like, and is led out to the power supply terminal part B through a partial gap 1a on the side surface of the speaker case 1 .

[0064] These components are covered with an inverted plate-shaped cover 5 attached to the above-mentioned resin-made speaker case 1 through the outer peripheral portion so as to press the outer periphery of the above-mentioned vibrating thin plate 3 . Here, th...

Embodiment 2

[0078] The structure of the electromagnetic acoustic transducer S is the same as that of the above-mentioned embodiment, and the same reference numerals are attached to the same parts including the brushless motor, and the description thereof is omitted.

[0079]The brushless vibration motor M is characterized in that the housing 77 is different from the above-described embodiments. The casing 77 is composed of a cylindrical portion 7b formed of a magnetic plate material, and a flange 7d formed continuously from the lower end of the cylindrical portion 7b, and the outer peripheral portion of the flange 7d is fixed to the lower end of the speaker case 1. side. The field magnet 4 is mounted on the speaker case 1 and the flange 7d.

[0080] The casing 77 not only forms a magnetic circuit for a speaker acting on the field magnet 4 , the yoke iron plate 4 a , and the movable voice coil 2 on the outer periphery, but also serves as a casing of the motor M. As shown in FIG. The flan...

Embodiment 3

[0088] image 3 In the third embodiment, in order to obtain a magnetic field balance of the eccentric rotor, like the above-mentioned embodiments, the same reference numerals are attached to the same components, and the description thereof will be omitted.

[0089] The motor M constituting the present invention is constituted by a Hall sensor type single-phase brushless motor. As is well known, a single-phase brushless motor needs to stop the rotor at a predetermined position in order to start automatically, but if a magnetic body is directly used in the above-mentioned bracket 6 and housing 7, due to the magnetic force of a strong magnet, the starting Since it is difficult, it is necessary to ensure a large gap, but in order to make it thinner, it is generally necessary to make the bracket 6 a non-magnetic body except for the static torque generating member 8 . When the thickness is about 2mm, the rotor yoke 10 holding the magnet has to adopt a thin structure, and the leakag...

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PUM

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Abstract

Using the flat brushless vibrating motor of the interior circuit as motor to reduce the thickness and prolong the life, is capable forming a case of the motor in the side loop of the loudspeaker simply, and make the magnetic field of the excitation magnet of the loudspeaker not influence motor. In order to make the flat brushless motor of the magnetic pole forming the loudspeaker influenced by the magnetic field of the excitation magent, but the leakage magentic filed can not influence the interior of the motor, the case of the motor case is equipped with magnetism around it, making the top section being a non-magnetism, separating the silent torque generation section influenced by the magnetic field of the rotor megnet which is diposed on one side of the holder from the magnetism section of the motor case.

Description

technical field [0001] The present invention relates to an electromagnetic-acoustic converter (commonly known as a "miniature speaker"), in particular to a so-called two-in-one electromagnetic-acoustic converter equipped with a flat brushless vibrating motor as a silent alarm. Background technique [0002] Conventionally, there is a device in which a pair of plate-shaped elastic bodies are opposed to each other on a frame, a magnetic field generator composed of a yoke and a magnet is installed on one plate-shaped elastic body, and a film-shaped elastic body is installed on the other. An annular movable voice coil is arranged in the magnetic field of the magnetic field generator so that currents with different frequencies can be applied alternately. (refer to patent document 1) [0003] In addition, there is also a device in which a cylindrical vibration motor is arranged in a lateral direction, and an eccentric weight is arranged on an output shaft of the cylindrical vibrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/06
Inventor 山口忠男大崎武司藤井健太郎小柳尚久
Owner TOKYO PARTS IND CO LTD
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