JP3798717B2 - Multi-function micro speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a speaker and an imaging device that form a multifunctional acoustic device used in a portable device, and more particularly, a speaker capable of capturing a speaker and a scene around the speaker while receiving sound from the speaker. The present invention relates to the overall configuration of an integrated multi-function micro speaker.
[0002]
[Prior art]
Conventionally, various attempts have been made to reduce the size, weight, and cost of portable devices. As an example thereof, a multi-functional acoustic device that integrally configures an acoustic device and a vibrating body or an acoustic device and a vibration motor can be given. The purpose of this technique is to allow a user of a portable device to detect an incoming call in the 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 (Document A), which is a conventional multi-function acoustic device by the same applicant as the present application, will be described. The basic configuration of the image pickup apparatus itself is known from, for example, Sho 62-254579 (Document B), regardless of whether the image pickup element is a CCD element or a C-MOS element. Reference documents A and B will be described in detail below.
[0003]
The multifunctional acoustic device of Document A shown in FIG. 2 includes a sounding body 100, a rotor 200, and a stator 300. A rotor shaft 106 having a rotor shaft diameter enlarged portion 106a provided to prevent the rotor from jumping upward due to vibration or the like is fixed to the center portion of the cup-shaped frame 111 formed of resin or the like. In the sounding body 100, a concentric cylindrical voice coil 102 that can be operated in a speaker gap 103, which will be described later, is fixed to a speaker diaphragm 101 having a dome 101a in the center formed of synthetic resin, and the outer periphery of the speaker diaphragm The part 101b is configured to be fixed to the frame 111 with an adhesive or the like. The outer periphery of the acoustic cover 110 having a plurality of sound emission holes is fixed to the outer end of the frame 111 on the upper surface of the speaker diaphragm 101. A rotor 200 that is mechanically engaged with the rotor shaft 106 and is rotatable via a washer 107 is a magnetic material mounted on a speaker magnet 105 having a single magnetic pole magnetized on the upper and lower surfaces in the thickness direction. A top yoke outer peripheral portion 104a of a cylindrical top yoke 104 made of the above forms an inner peripheral portion of a speaker gap 103 that engages with the voice coil 102, and is formed at the center of a hollow disc-shaped lower yoke 108 made of a magnetic material. A cylindrical side yoke 109 made of a magnetic material is disposed on the outer periphery of the hollow disc-shaped lower yoke 108 so as to be opposed to the outer periphery 104a of the top yoke 104 with the speaker gap 103 interposed therebetween. A rotor permanent magnet 201 having a multi-pole magnetized outer peripheral side surface is provided on the outer peripheral portion of the yoke 109.
[0004]
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 105, the outer peripheral portion 104a of the top yoke 104, and the speaker gap 103. And the side yoke 109. In another magnetic circuit, a magnetic flux generated by a magnetic pole magnetized in multiple poles on the outer peripheral side surface 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. The The material of the rotor permanent magnet 201 may be selected according to required specifications such as bond ferrite and bond NdFeB. The number of poles is eight in the embodiment, but may be two or more, and the magnetic pole width may be an appropriate value in design. In order to increase the vibration and vibration force due to the centrifugal force generated when the rotor 200 rotates, the rotor 200 is formed of a material having a large specific gravity, for example, a resin filled with tungsten fine powder, on the outer peripheral upper surface of the rotor permanent magnet 201. Secure the weight. Further, the speaker magnet 105 and the rotor permanent magnet 201 may be slightly decentered and fixed.
[0005]
The stator 300 facing the rotor 200 via the motor gap 203 is composed of a stator winding 306 wound in a plurality of concentric cylinders, a pair of stator upper yokes 301, a stator lower yoke 303, and a pair of stator windings 306. It is configured so as to be surrounded by an upper tacking plate 302 and a lower tacking plate 304. The disk-shaped stator upper yoke 301 made of a magnetic material has four main magnetic poles bent in a sawtooth shape on the inner peripheral portion of the stator, and four magnetic poles in total, and four magnetic poles. The disk-shaped lower stator yoke 303 made of a material has four main magnetic poles bent in a sawtooth shape on the inner peripheral portion of the stator, and four auxiliary magnetic poles for a total of eight magnetic poles. Adjacent magnetic pole pitches are arranged at intervals of 90 ° mechanical angle (360 ° 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 the width of the auxiliary magnetic pole.
[0006]
Next, the operation will be described. First, when a so-called high-frequency signal having a wide band is applied to the voice coil input terminals 112a and 112b alone, a force acts in the Y direction on the voice coil 102 in the speaker gap 103, and the speaker diaphragm 101 of the sounding body 100. Vibrates in the Y direction, generates sound pressure, and emits sound waves through the sound emission holes of the acoustic cover 110.
[0007]
A low frequency signal of about 100 to 300 Hz is applied to the input terminals 305a and 305b of the stator winding 306 to generate a rotating magnetic field and generate a rotational force in a fixed direction on the rotor 200 to give a vibrational shaking force. be able to. Therefore, in the example of Document A, it is shown that either one or both of the sound reception by the speaker and the manner mode by the vibrational vibration force can be sensed.
[0008]
Further, according to Document B, the solid-state imaging device has a transparent substrate made of a glass substrate or a quartz plate bonded and fixed on the light-receiving surface of the solid-state imaging element chip held by the chip carrier, and the surface of the transparent substrate. The optical system housed in the external case and the solid-state imaging device chip are aligned with each other as an optical reference. Therefore, although the configuration of the imaging device is disclosed, no reference is made to an integrated multi-function acoustic device.
[0009]
[Problems to be solved by the invention]
As is clear from the above description, the conventional multi-function acoustic device is mainly for the purpose of improving the space efficiency in order to selectively or simultaneously sense either the sound reception or the manner mode related to the sound. It is constructed integrally. In addition, recently released products have been announced in which a speaker and an imaging device are separately mounted, but this is not an audio device integrated with a speaker related to transmission / reception of images of the portable device. Therefore, even if there is a portable device in which the speaker and the imaging device are separately mounted, there is no multi-functional acoustic device that integrates them, and the space efficiency of the portable device cannot be improved.
[0010]
[Means for Solving the Problems]
An object of the present invention is to realize a multi-function micro speaker with a simple configuration by removing the above-mentioned drawbacks, and in particular, an imaging device is provided at the center inside the diaphragm of the speaker constituting the magnetic circuit. It is characterized by the arrangement. The invention according to claim 1 of the multifunctional micro speaker of the present invention made in order to achieve the above object, said voice coil and magnetically engage with the anchored concentric cylindrical voice coil speaker diaphragm In a multi-function micro speaker having an acoustic device composed of a magnetic circuit and an imaging device disposed in the acoustic device ,
An imaging device is arranged in the center inside the speaker diaphragm constituting the magnetic circuit.
[0011]
The invention according to claim 2 of the multifunctional microspeaker of the present invention made to achieve the above object is a concentric cylindrical voice coil fixed to a speaker diaphragm and magnetically engaged with the voice coil. In a multi-function micro speaker having an acoustic device comprising a magnetic circuit and an imaging device disposed in the acoustic device, the magnetic pole is magnetized to a single magnetic pole in a thickness direction that is magnetically engaged with the voice coil. A disk-shaped outer yoke made of a magnetic material that constitutes a gap in which the outer periphery is magnetically engaged with the voice coil is disposed on the upper surface of a hollow disk-shaped speaker magnet disposed on the outer periphery, and the speaker magnet A hollow cup-shaped yoke made of a magnetic material that forms a magnetic path through a gap so as to be magnetically engaged with the voice coil is fixed to the lower surface of the inner surface of the cup-shaped yoke. It is characterized in that it has provided the outer peripheral portion of the solid-state imaging device Te.
[0012]
Further, the invention according to claim 3 of the multifunctional microspeaker of the present invention made to achieve the above object is characterized in that the central portion of the diaphragm of the multifunctional microspeaker constitutes an optical filter. It is what.
[0013]
Further, the invention according to claim 4 of the multifunctional microspeaker of the present invention made to achieve the above object is that the imaging device of the multifunctional microspeaker has an optical element mounted on the inner peripheral side surface of the outer case. The optical element and the image pickup element mounted on the circuit board are arranged so as to overlap each other in the optical axis direction .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the main part of an embodiment of the multifunctional microspeaker of the present invention.
[0016]
In FIG. 1, the multifunctional microspeaker of the present invention includes a microspeaker 10 and a solid-state imaging device 30. A microspeaker 10 housed in a cup-shaped frame 14 made of resin or the like has a concentric cylindrical shape that can be operated in a speaker gap 13 to be described later on 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 configured to be fixed to the frame 14 with an adhesive or the like. The outer periphery of a protector 15 having a plurality of sound emission holes is fixed to the outer end of the frame 14 on the upper surface of the speaker diaphragm 11. The speaker gap 13 that is magnetically engaged with the voice coil 12 has a top yoke inner peripheral portion 16a of the top yoke 16 that sandwiches the upper and lower surfaces of a hollow disk-shaped speaker magnet 18 that is magnetized with a single magnetic pole in the axial direction. And the outer peripheral portion 17a of the hollow portion of the speaker 17 having a hollow cup shape.
[0017]
The outer case 31 of the imaging device 30 is held and fixed to the side surface of the inner peripheral portion 17 b of the speaker yoke 17 when viewed from the speaker center 21. The image sensor chip 32 mounted on the circuit board 34 is fixed to the bottom portion of the frame 14 via the circuit board 34 and is laminated so that the optical axis is orthogonal to the optical system 33 fixed to the outer case 31. Since light from the outside enters the imaging device 30 via the speaker diaphragm 11, the central portion of the dome 11a of the speaker diaphragm 11 must be as flat as possible. In the description of the embodiment, the speaker yoke 17 and the outer case 31 are separated from each other. However, it is obvious that these may be integrally formed. The optical system 33 may be provided with a diaphragm device or a filter, and a diaphragm mechanism may be provided at the center of the protector 15.
[0018]
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, and at the same time, the imaging device 30 can receive external light and take an image.
[0019]
【The invention's effect】
According to the multifunctional microspeaker of the present invention, it is obvious that the functions of the speaker and the imaging device can be combined with a simple configuration, which contributes to miniaturization and multifunctionalization of the mounted portable device.
[0020]
According to the present invention, the multifunctional microspeaker capable of sound generation and imaging is not only reduced in size and thickness, but also has a simple configuration, so that the cost / performance is improved and the practical effect is remarkable.
[Brief description of the 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 multi-function acoustic device.
[Explanation of symbols]
10 Micro speaker 11 Speaker diaphragm 11a Dome 12 Voice coil 13 Speaker gap 14 Frame 15 Protector 16 Top yoke 16a Top yoke inner / outer peripheral portion 17 Speaker yoke 17a Speaker yoke outer / inner peripheral portion 17b Speaker yoke inner / outer peripheral portion 18 Speaker magnets 19, 20 Input terminal 30 Solid-state imaging device 31 External case 32 Imaging element chip 33 Optical system 34 Circuit board

Claims (4)

A multi-function micro speaker having a concentric cylindrical voice coil fixed to a speaker diaphragm, an acoustic device comprising a magnetic circuit magnetically engaged with the voice coil, and an imaging device disposed in the acoustic device In
A multifunctional microspeaker, characterized in that an imaging device is disposed in the central part inside the speaker diaphragm constituting the magnetic circuit. A multi-function micro speaker having a concentric cylindrical voice coil fixed to a speaker diaphragm, an acoustic device comprising a magnetic circuit magnetically engaged with the voice coil, and an imaging device disposed in the acoustic device In
A magnetic pole that is magnetically engaged with the voice coil is magnetized by a single magnetic pole in the thickness direction, and the outer peripheral portion is magnetically engaged with the voice coil on the upper surface of a hollow disk-shaped speaker magnet disposed on the outer peripheral portion of the frame. A disc-shaped outer yoke made of a magnetic material that forms a gap is formed, and is made of a magnetic material that forms a magnetic path through the gap so as to be magnetically engaged with the voice coil on the lower surface of the speaker magnet. The multifunction microspeaker according to claim 1, wherein a hollow cup-shaped yoke is fixed and an outer peripheral portion of the solid-state imaging device is disposed along an inner peripheral side surface of the cup-shaped yoke. The multifunctional microspeaker according to claim 1 or 2, wherein a central portion of the diaphragm of the multifunctional microspeaker constitutes an optical filter. The imaging device for the multi-function micro speaker is characterized in that an optical element is mounted on the inner peripheral side surface of the outer case, and the optical element and the imaging element mounted on the circuit board are disposed so as to overlap in the optical axis direction. The multifunction microspeaker according to claim 1.

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