JP2003274475A - Multi-function type micro speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide multi-function features to a solid-state imaging apparatus which is contained in a micro speaker. <P>SOLUTION: An acoustic apparatus comprising a voice coil 12 of concentric cylinders fixed to a speaker diaphragm 11 and a magnetic circuit magnetically coupled with the voice coil 12 is characterized in that the solid-state imaging apparatus 30 is placed in the center of the micro speaker 10 forming the magnetic circuit so as to be opposite to the speaker diaphragm 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a speaker and an image pickup device forming a multifunctional acoustic device used in a portable device, and particularly to a speaker and a surrounding area of the speaker while receiving sound from the speaker. The present invention relates to the overall configuration of a multifunctional micro-speaker integrated with a speaker capable of picking up a scene.

[0002]

2. Description of the Related Art Conventionally, various attempts have been made to reduce the size and weight of portable devices and reduce the cost. An example thereof is a multifunctional acoustic device in which an audio device and a vibrating body or an audio device and a vibration motor are integrally configured. The purpose of this technique is to allow a user of a portable device to sense an incoming call in a manner mode and to obtain normal reception selectively or simultaneously. In this case, a part of the permanent magnet for the speaker or other added permanent magnet is often used in the above-described vibrating body or vibration motor. Here, Japanese Patent Application No. 2000-286414, which is a conventional multifunctional audio device by the same applicant as this application, is used.
No. (Reference A) is explained. The basic structure of the image pickup apparatus itself, whether the image pickup element is a CCD element or a C-MOS element, is known from, for example, Japanese Patent Laid-Open No. 62-254579 (Document B). The references A and B will be described in detail below.

The multifunctional acoustic device of Document A shown in FIG.
It is composed of a sounding body 100, a rotor 200, and a stator 300. Cup-shaped frame 11 made of resin or the like
A rotor shaft diameter enlarged portion 106a provided in the center of the rotor 1 to prevent the rotor from jumping up due to vibration or the like.
A sounding body 100 to which a rotor shaft 106 having a
Is a speaker diaphragm 1 having a dome 101a in the center formed of a synthetic resin.
A voice coil 102 having a concentric cylindrical shape that can be operated in 03 is fixed, and the speaker diaphragm outer peripheral portion 101b is the frame 1
11 is fixed by an adhesive or the like. An outer circumference of an acoustic cover 110 having a plurality of sound output holes is fixed to an outer end of a frame 111 on the upper surface of the speaker diaphragm 101. The washer 107 is mechanically engaged with the rotor shaft 106.
The rotor 200, which can be freely rotated via, is mounted on the speaker magnet 105 having a single magnetic pole on the upper and lower surfaces in the thickness direction. Is the voice coil 102
An inner peripheral portion of the speaker gap 103 that engages with the speaker is formed, is fixed to the central portion of a hollow disk-shaped lower yoke 108 made of a magnetic material, and is made of a magnetic material on the outer peripheral portion of the hollow disk-shaped lower yoke 108. A rotor side permanent magnet, in which a cylindrical side yoke 109 is disposed so as to face the outer peripheral portion 104a of the top yoke 104 via a speaker gap 103, and the outer peripheral side surface of the side yoke 109 is multi-pole magnetized. It is configured by providing 201.

The permanent magnets mounted on the rotor 200 are the speaker magnet 105 and the rotor permanent magnet 201, and there are two magnetic circuits, one of which is the speaker magnet 10.
5, the outer peripheral portion 104a of the top yoke 104, the speaker gap 103, and the side yoke 109. In the other magnetic circuit, magnetic flux generated by magnetic poles magnetized on the outer peripheral portion of the rotor permanent magnet 201 is formed via a motor gap 203 between the side yoke 109 and a stator magnetic pole described later. It The material of the rotor permanent magnet 201 may be selected according to required specifications such as bond ferrite and bond NdFeB.
Further, although the number of poles is 8 in the embodiment, it may be 2 or more,
The magnetic pole width may be an appropriate value in design. In order to increase the vibrational vibrational force due to the centrifugal force generated when the rotor 200 rotates, the rotor permanent magnet 201 is formed of a material having a large specific gravity in a semicircular shape on the outer peripheral upper surface thereof, for example, a resin filled with tungsten fine powder. Fix the dead weight. In addition, the speaker magnet 10
5. The rotor permanent magnet 201 may be slightly eccentric and fixed.

The stator 300, which faces the rotor 200 through the motor gap 203, has a plurality of stator windings 306 wound in a concentric cylindrical shape and a pair of upper stator yokes 301.
The stator lower yoke 303, a pair of the upper rake plate 302, and the lower kuma plate 304 are arranged so as to be surrounded. The disc-shaped stator upper yoke 301 made of a magnetic material has four main magnetic poles bent in a sawtooth shape with respect to the inner peripheral portion of the stator.
The disk-shaped stator lower yoke 303, which has a total of eight auxiliary magnetic poles and four magnetic poles, has four main magnetic poles bent in a sawtooth shape with respect to the inner peripheral portion of the stator and four magnetic poles. Each of the auxiliary poles has a total of eight magnetic poles, and one magnetic pole pitch adjacent to each other in the vertical direction is arranged at an interval of 90 ° in mechanical angle (360 ° in electrical angle). The sum of the magnetic pole width of the main magnetic pole and the width of the auxiliary magnetic pole is within 45 ° in mechanical angle, and the magnetic pole width of the main magnetic pole is formed wider than that of the auxiliary magnetic pole.

Next, the operation will be described. First, when a so-called high-frequency signal having a wide band is applied independently to the voice coil input terminals 112a and 112b, the speaker gap 103
A force acts on the voice coil 102 in the Y direction in the Y direction, the speaker diaphragm 101 of the sounding body 100 vibrates in the Y direction to generate sound pressure, and emits a sound wave through the sound emission hole of the acoustic cover 110.

Input terminals 305a, 3 of the stator winding 306
A low-frequency signal of about 100 to 300 Hz is applied to 05b to generate a rotating magnetic field to generate a rotational force in a fixed direction on the rotor 200 to give an oscillating vibrational force. Therefore, in the example of Document A, it is shown that one or both of the sound received by the speaker and the manner mode by the vibration exciting force can be sensed at the same time.

Further, according to Document B, a solid-state image pickup device has a transparent substrate made of a glass substrate or a crystal plate, which is adhered and fixed, on a light-receiving surface of a solid-state image pickup element chip held by a chip carrier. An optical system housed in an external case and a solid-state image sensor chip are aligned with each other using the surface of the substrate as an optical reference. Therefore, although the configuration of the image pickup device is disclosed, the integrated multifunctional audio device is not mentioned.

[0009]

As is apparent from the above description, the conventional multifunctional audio device selectively or simultaneously senses the function of either the sound reception or the manner mode related to the sound. In addition, it is integrally configured mainly for the purpose of improving space efficiency. In addition, although a product in which a speaker and an image pickup device are separately mounted in a mobile device that has been recently commercialized has been announced, it is not an acoustic device integrated with a speaker related to transmission and reception of images of the mobile device. Therefore, even though there is a portable device in which the speaker and the image pickup device are separately mounted, there is no multifunctional audio device in which they are integrated, and the space efficiency of the portable device cannot be improved.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above drawbacks and to realize a multifunctional microspeaker with a simple structure. In particular, the image pickup device is arranged at the center of the speaker. It is characterized in that it was configured. A multi-function type micro speaker according to the present invention, which has been made to solve the problems, comprises a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaging with the voice coil. In the audio device, the solid-state imaging device is arranged in the center of the speaker forming the magnetic circuit so as to face the diaphragm of the speaker.

A multifunctional microspeaker according to the present invention, which has been made in order to solve the problems, provides a concentric cylindrical voice coil fixed to a speaker diaphragm, and a magnetic field which magnetically engages with the voice coil. In an acoustic device including a circuit, a single magnetic pole is magnetized in a thickness direction that magnetically engages with the voice coil, and an outer peripheral portion is formed on an upper surface of a hollow disk-shaped speaker magnet arranged on an outer peripheral portion of a frame. A disk-shaped outer peripheral yoke made of a magnetic material that forms a gap that magnetically engages with the voice coil is provided, and a gap is formed on the lower surface of the speaker magnet so as to magnetically engage the voice coil. A hollow cup-shaped yoke made of a magnetic material that forms a magnetic path is fixed, and an outer case of the solid-state imaging device is arranged along the inner peripheral side surface of the cup-shaped yoke.

Further, according to claim 3 of the multi-function type micro-speaker of the present invention made to solve the problems, the central portion of the diaphragm of the multi-function-type micro-speaker functions as an optical filter.

According to a fourth aspect of the multi-function type micro-speaker of the present invention made to solve the problem, the image pickup device of the multi-function type micro-speaker has an optical system element mounted on an inner peripheral side surface of an outer case. The optical element and the image pickup element mounted on the circuit board are arranged so as to overlap each other.

Further, according to claim 5 of the multi-function type micro-speaker of the present invention made to solve the problem, the protector of the multi-function type micro-speaker is characterized in that the surface of the metal material is a material having high reflectance. It is characterized by having been processed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of an embodiment of a multifunctional microspeaker of the present invention.

In FIG. 1, the multi-function type micro-speaker according to the present invention includes a micro-speaker 10 and a solid-state image pickup device 30.
Composed of and. The microspeaker 10 housed in a cup-shaped frame 14 formed of resin or the like has a concentric cylindrical shape that can be operated in a speaker gap 13 described later in a speaker diaphragm 11 having a dome 11a in the center formed of synthetic resin. The voice coil 12 is fixed, and the outer peripheral portion 11b of the speaker diaphragm 11 is fixed to the frame 14 with an adhesive or the like. On the upper surface of the speaker diaphragm 11, the outer periphery of the protector 15 having a plurality of sound output holes is formed on the frame 1.
It is fixed to the outer end of 4. The speaker gap 13 that magnetically engages with the voice coil 12 has an inner peripheral portion 16a of the top yoke 16 that holds the upper and lower surfaces of a hollow disk-shaped speaker magnet 18 magnetized in a single magnetic pole in the axial direction. And the outer peripheral portion 17a of the speaker cup 17 having a hollow cup shape.

The outer case 31 of the image pickup device 30 has an inner peripheral portion 17b of the speaker yoke 17 when viewed from the speaker center 21.
It is held and fixed on the side of the. The image pickup device chip 32 mounted on the circuit board 34 is connected to the frame 14 via the circuit board 34.
The optical system 33, which is fixed to the bottom of the optical system 33 and is fixed to the outer case 31, is laminated so that its optical axis is orthogonal to the optical system 33. Light from outside passes through the speaker diaphragm 11 and the imaging device 3
Since it is incident on 0, the central portion of the dome 11a of the speaker diaphragm 11 must be as flat as possible. Further, in the description of the embodiment, the speaker yoke 17 and the outer case 31 will be described.
Although the above is a separate body, it is obvious that this may be integrally formed. A diaphragm device or a filter may be provided in the optical system 33, and a diaphragm mechanism may be arranged at the center of the protector 15.

When a signal is applied to the input terminals 19 and 20, the speaker diaphragm 11 vibrates in the Y direction to generate sound pressure,
At the same time, the imaging device 30 can receive external light and take an image.

[0019]

According to the multi-function type micro-speaker of the present invention, the functions of the speaker and the image pickup device can be combined with a simple structure, so that it is possible to contribute to the miniaturization and the multi-functionalization of the mobile device to be mounted. it is obvious.

According to the present invention, not only can the multifunctional type microspeaker capable of sounding and picking up an image be miniaturized and thinned, but also the cost / performance can be improved due to its simple structure, so that the practical effect is remarkable. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an embodiment of a multifunctional microspeaker of the present invention.

FIG. 2 is a cross-sectional view of a conventional multifunctional audio device.

[Explanation of symbols]

10 micro speaker 11 speaker diaphragm 11a dome 12 voice coils 13 speaker space 14 frames 15 protector 16 Top York 16a Top yoke outer circumference 17 speaker yoke 17a Inner circumference of speaker yoke 17b Outer periphery of speaker yoke 18 speaker magnet 19,20 Input terminals 30 Solid-state imaging device 31 External case 32 Image sensor chip 33 Optical system 34 circuit board

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04R 9/02 102 H04R 9/02 102B

Claims (5)

[Claims] 1. An audio device comprising a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaged with the voice coil, wherein a solid-state imaging is provided at a central portion of a speaker forming the magnetic circuit. A multifunctional microspeaker, wherein the device is arranged so as to face the diaphragm of the speaker. 2. An acoustic device comprising a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaged with the voice coil, wherein the thickness direction is magnetically engaged with the voice coil. A disk shape made of a magnetic material, which is magnetized into a single magnetic pole and has a hollow disk-shaped speaker magnet disposed on the outer peripheral portion of the frame, the outer peripheral portion of which constitutes a space for magnetically engaging the voice coil. And a hollow cup-shaped yoke made of a magnetic material that forms a magnetic path through a gap so as to magnetically engage the voice coil on the lower surface of the speaker magnet. 2. The multi-function type micro speaker according to claim 1, wherein an outer case of the solid-state image pickup device is arranged along the inner peripheral side surface of the yoke. 3. The multifunctional microspeaker according to claim 1, wherein a central portion of the diaphragm of the multifunctional microspeaker functions as an optical filter. 4. The multi-function type micro-speaker image pickup device is characterized in that an optical system element is mounted on an inner peripheral side surface of an outer case, and the optical element and the image pickup element mounted on a circuit board are arranged in an overlapping manner. The multifunctional microspeaker according to any one of claims 1 to 3. 5. The multi-function protector according to claim 1, wherein the protector of the multi-function micro speaker has a surface of a metal material treated with a material having high reflectance. Micro speaker. Noh sound equipment.