JP2008198760A - Transformer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer device advantageous in preventing occurrence of oscillation noise. <P>SOLUTION: A transformer device 8 comprises a transformer 10 and a fitting plate 20. The transformer 10 comprises a core 12 and winding 14. The fitting plate 20 comprises a first plate part 22 to which the core 12 is attached and a second plate part 24 which is positioned at the point deviated in thickness direction of the first plate part 22 for the transformer device 8 to be attached to an attaching point 2. The first plate part 22 is provided with a plurality of protruding parts 26 protruding in the direction opposite to the second plate part 24. The protruding part 26 is formed to protrude in cylindrical form from the first plate part 22 by a pressing process. The tubular interior of a tip end 2602 is welded to a bottom surface 12B, thereby the core 12 is fitted to the fitting plate 20. A gap S of the dimension corresponding to height H of the protruding part 26 is assured between the bottom surface 12B of the core 12 and the first plate part 22 except for the protruding part 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a transformer device.

The transformer device includes a transformer and a mounting plate. The transformer includes a core around which a winding is wound. The mounting plate is attached to the bottom surface of the core (see Patent Documents 1, 2, and 3). .
This mounting plate is used to mount the transformer to a housing or frame of an electronic device. In many cases, the mounting plate is attached to the core by being welded with its surface in contact with the bottom surface of the core. It is worn.
JP 60-45003 Akiyoshi 61-153320 Akira 61-205117

By the way, when such a transformer device is incorporated and used in a speaker with a built-in amplifier or the like, depending on the frequency of the sound generated from the speaker, a portion of the mounting plate away from the location welded to the core may be May resonate with sound.
This is because, although the surface of the mounting plate is in contact with the bottom surface of the core, a slight gap remains between the location of the surface of the mounting plate other than welding and the bottom surface of the core.
When the mounting plate resonates in this way, the surface of the mounting plate collides with the bottom surface of the core, and vibration noise (billing sound) having a frequency component of, for example, about 150 Hz to 200 Hz is generated, which may hinder the sound quality. There is.
The present invention has been made in view of such circumstances, and an object thereof is to provide a transformer device that is advantageous in preventing the generation of vibration noise.

  In order to achieve the above object, the present invention provides a transformer device in which a mounting plate is attached to the bottom surface of a core, wherein the mounting plate includes a first plate portion to which the bottom surface is attached, and the first plate portion. A second plate portion that is located at a location displaced in the thickness direction of the first plate portion and is used to attach the transformer to the attachment location, and the second plate portion is connected to the first plate portion, Is provided with a plurality of convex portions protruding in opposite directions, and the tips of the convex portions are attached to the bottom surface by welding so that the core is attached to the mounting plate, and the convex portions are excluded. A gap having a dimension corresponding to the height of the convex portion is secured between the one plate portion and the bottom surface.

  According to the present invention, a gap having a dimension corresponding to the height of the convex portion is secured between the first plate portion excluding the convex portion and the bottom surface of the core. Even if they resonate, since the gap is secured, it is possible to reliably prevent the first plate portion from colliding with the bottom surface of the core and generating vibration noise (billing noise).

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a transformer device 8 according to the present embodiment, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG.
As shown in FIGS. 1 and 2, the transformer device 8 includes a transformer 10 and a mounting plate 20.

The transformer 10 includes a core 12 and a winding 14.
The core 12 is made of a material having a high saturation magnetic flux density and high magnetic permeability, and as such a material, various conventionally known materials such as a silicon steel plate can be adopted.
In the present embodiment, the core 12 is composed of an EI core obtained by punching a silicon steel plate into an EI shape, and the outer shape is formed by a rectangular parallelepiped outline. Further, the size of the transformer device 8 (core 12) of the present embodiment is EI76, and the output is 150W.
That is, the core 12 has a rectangular parallelepiped shape, and includes an upper surface 12A and a bottom surface 12B, a front surface 12C and a rear surface 12D, and left and right side surfaces 12E and 12F.
Each of the side surfaces 12E and 12F has a rectangular frame shape extending along the periphery of the rectangular opening.
The core 12 has a magnetic leg (not shown).

The winding 14 includes a primary winding and a secondary winding, and the primary winding and the secondary winding are wound around the magnetic leg of the core 12 to constitute the coil 14A.
The coil 14A protrudes outward from the openings of the side surfaces 12E and 12F.
The terminal holding part 16 is provided so that the coil 14A may cover a portion protruding outward from the opening of the one side surface 12E.
The terminal holding part 16 is provided with a plurality of connection terminals 18, and each connection terminal 18 is connected to the primary winding and the secondary winding.

As shown in FIGS. 2 and 3, the attachment plate 20 is attached to the core 12, and in this embodiment, the attachment plate 20 is attached to the bottom surface 12 </ b> B of the core 12.
The mounting plate 20 is made of metal.
As shown in FIGS. 1 and 2, the mounting plate 20 is located at the first plate portion 22 to which the core 12 is attached, and at a location displaced in the thickness direction of the first plate portion 22. And a second plate portion 24 for attaching the to the attachment location 2.

In the present embodiment, as shown in FIG. 1, the mounting plate 20 has leg piece portions 28 extending on both sides of the first plate portion 22 in a direction intersecting the first plate portion 22. The second plate portion 24 is connected to the end portion of each leg piece portion 28 and is parallel to the first plate portion 22.
The second plate portion 24 is connected to a pair of short sides of the first plate portion 22 via leg pieces 28, respectively. As shown in FIG. 2, the width of the second plate portion 24 is the first width. It is formed with a dimension larger than the width of the plate portion 22.
A screw insertion hole 2402 for attachment is formed at both ends of each second plate portion 24.

In the present embodiment, the first plate portion 22 has a rectangular shape having a contour that is slightly larger than the contour of the bottom surface 12B.
As shown in FIGS. 2 and 3, the first plate portion 22 is provided with a plurality of convex portions 26 that protrude in the direction opposite to the second plate portion 24. In the present embodiment, the convex portion 26 is formed in a cylindrical shape protruding from the first plate portion 22 by pressing (including drawing and half-punching), and is coaxial with the convex portion 26 at the tip of the convex portion 26. A hole 2610 is formed in the hole.
Four convex portions 26 are provided, and each convex portion 26 is located in the vicinity of the corner portion of the first plate portion 22.
With the four sides of the first plate portion 22 parallel to the four sides of the bottom surface 12B of the core 12, the tip 2602 of each convex portion 26 is applied to a location near the four corners of the bottom surface 12B of the core 12. The core 12 is attached to the mounting plate 20 by welding the cylindrical interior of the tip 2602 (the inner periphery of the hole 2610) and the bottom surface 12B. That is, the attachment by welding is performed between the inside of the cylindrical portion at the tip 2602 of the convex portion 26 and the bottom surface 12B.
A gap S having a dimension corresponding to the height H of the convex portion 26 is secured between the first plate portion 22 excluding the convex portion 26 and the bottom surface 12B of the core 12.
More specifically, a gap S having a dimension corresponding to the height H of the convex portion 26 is secured between the entire area of the first plate portion 22 excluding the convex portion 26 and the bottom surface 12B of the core 12.
In the present embodiment, the thickness t of the mounting plate 20 is 1.2 mm, the diameter D1 of the tip 2602 of the convex portion 26 is 10 mm, the diameter D2 of the base end of the convex portion 26 is 11 mm, and the cylindrical shape of the tip 2602. The inner diameter (the inner diameter of the hole 2610) D3 is 4 mm.
Moreover, if the height H of the convex part 26 is 0.2 mm-0.3 mm, the desired effect can fully be achieved.

  According to the present embodiment, a gap S having a dimension corresponding to the height of the convex portion 26 is ensured between the entire area of the first plate portion 22 excluding the convex portion 26 and the bottom surface 12B of the core 12. Therefore, even if the first plate portion 22 resonates due to sound, the gap S is secured, so that the first plate portion 22 collides with the bottom surface 12B of the core 12 and vibration noise (billing sound) is generated. Generation | occurrence | production can be prevented reliably, and it becomes advantageous when ensuring the quality of sound.

  Hereinafter, an amplifier built-in type speaker 50 (see FIG. 8) using the transformer device 8 of the present embodiment will be described. Prior to that, a multi-channel audio reproduction system using the amplifier built-in type speaker 50 will be described. .

Multi-channel audio playback system is popular because it has a D / A converter, a power amplifier, and a speaker for each output channel of the digital signal processing circuit, and has high fidelity and excellent sound effects. It is expensive and has been widely used recently.
Here, with reference to FIG. 4 to FIG. 7, the configuration of an optical disc player equipped with a multi-channel audio playback system will be described.
4 is a block diagram showing the configuration of the optical disk player, FIG. 5 is a block diagram showing the configuration of the signal detection unit, signal processing and control unit, and FIG. 6 is a block diagram showing the configuration of the D / A conversion / amplification unit and output unit. 7 and 7 are perspective views showing the speaker system of the output unit.
As shown in FIG. 4, the optical disc player 120 includes a signal detection unit 122 that detects an audio signal and a video signal stored in the optical disc, a signal processing and control unit 124, a D / A conversion and amplifier unit 126, And an output unit 128.

As shown in FIG. 5, the signal detection unit 122 includes a spindle motor 133 that rotates the optical disc 131, an optical pickup 134 that detects an optical signal, a threading motor 135 that moves the optical pickup 134 in the radial direction of the optical disc 131, And an RF / EQ amplifier 136 for performing equalization processing of the photodetection signal.
On the optical disk 131, a compressed digital video signal and an accompanying digital audio signal are recorded. The optical pickup 134 irradiates the optical disc 131 with the laser beam converged by the objective lens, passes the laser beam reflected and diverged on the optical disc 131 through an optical system such as the objective lens, and then detects the converged laser beam. The light detection signal is output to the RF / EQ amplifier 136.
The RF / EQ amplifier 136 performs equalizing processing of the light detection signal.

As shown in FIG. 5, the signal processing and control unit 124 includes a signal processing system and a control system.
The signal processing system performs RF signal processing on the signal output from the RF / EQ amplifier 136 to convert it into a binary digital signal, and video for decoding the digital signal output from the RF signal processing block 136 The audio signal decoding block 142, the digital audio signal processing block 145 for processing the decoded audio signal, and the D-RAM 141 described in the video / audio signal decoding block 142 as a storage device are provided.
The control system controls the rotation of the spindle motor 133 via the motor driver 138 and also controls the threading motor 135 to perform the tracking servo of the optical pickup 134 and the focus servo of the optical pickup 134, the optical block A system control microcomputer 143 for controlling the entire system of the player 120, and an interface microcomputer 144 interposed between the operation buttons 154 and the operation indicator 155 and the microcomputer 143 are provided.

As shown in FIG. 6, the D / A conversion / amplifier unit 126 includes, as an audio signal system, an audio signal D / A conversion block 146 that converts a digital signal into an analog signal, an audio signal attenuation block (VOL) 152, and 3. A system audio signal amplifier block 148 and a relay circuit 153 are provided, and a video signal D / A conversion block 147 is provided as a video signal system.
The output unit 128 includes a plurality of full-range speakers 149 and a low-frequency dedicated speaker 150 as an audio signal system, and a video output device 151 as a video signal system.
The RF signal output from the photodetector of the optical pickup 134 is subjected to equalizing processing by the RF / EQ amplifier 136 and then supplied to the RF signal processing block 139 to be decoded and converted into a binary digital signal. Converted.
The digital signal output from the RF signal processing block 139 is input to the video / audio decoding block 142.
When the digital signal from the RF signal processing block 139 is a signal compressed by mixing video and audio, the digital video signal decoded and expanded by the video / audio decoding block 142 and the expanded digital audio A signal or a digital signal obtained by compressing a plurality of channels of audio is output.
The video / audio signal decoding block 142 is connected to a D-RAM 141 as storage means, and data is exchanged between the video / audio signal decoding block 142 and the D-RAM 141.

The decompressed digital video signal output from the video / audio signal decoding block 142 is supplied to the video signal D / A conversion block 142 for D / A conversion, and the obtained analog video signal is, for example, a television receiver. The video is output to the video output device 151 of the machine and displayed.
On the other hand, the digital audio signal output from the video / audio signal decoding block 142 is sent to the digital audio signal processing block 145.
In the case of a digital signal obtained by compressing a plurality of channels of audio, the digital audio signal processing block 145 performs further expansion processing, and the expanded digital audio signals of the plurality of channels are supplied to the audio signal D / A conversion block 146. Is output.
Further, the digital audio signal processing block 145 can digitally perform filtering processing, delay processing, etc. on the input of the decompressed digital audio signal, and add the processing effect to the output signal.

In the audio signal D / A conversion block 146, the digital audio signal is D / A converted and output as an analog audio signal of a plurality of channels.
This analog audio signal is amplified by an audio amplifier circuit 148 and further switched by a plurality of relay circuits 153 provided for each channel, and directly sent to a plurality of full-range speakers 149 and low-frequency dedicated speakers 150 for each subsequent channel. It can be driven.
The audio signal attenuation block (VOL) 152 adjusts the level of the analog signal output from the audio signal D / A conversion block 146.
The RF signal processing block 139, the video / audio decoding block 142, and the video signal D / A conversion block 147 are controlled by a system control microcomputer 143.
The audio signal D / A conversion block 146 and the digital audio signal processing block 145 are controlled by the interface microcomputer 144.

With reference to FIG. 7, the speaker system 160 provided with the above-described full-range speaker 149, the low-frequency dedicated speaker 150, and the like will be further described.
For example, in the case of 5.1 channel, that is, an audio signal in a multi-channel format is reproduced by Dolby (registered trademark) digital 5.1 channel (DTS 5.1 channel) defined as one of the audio standards of DVD. In this case, the speaker system 160 includes five satellite speakers 162, 164, 166, 168, 170 as a plurality of full-range speakers 149, as shown in FIG. A speaker 172 is provided.
One of the satellite speakers is a speaker 150 (subwoofer speaker 172) for a channel dedicated to low-frequency reproduction.
Here, Dolby Digital is a multi-track sound system based on a digital audio signal compression system developed by US Dollar Bee Laboratories, and a 5.1 channel audio playback system is an audio playback system of the Dolby Digital AC-3 system. Then, “0.1” in 5.1 refers to the channel for the super woofer.
When a 5.1 channel audio signal is reproduced using the speaker system 160, sound is output from all the speakers.

The multi-channel audio reproduction system can reproduce a two-channel audio signal.
When using the speaker system 160 to reproduce the sound of a two-channel audio signal such as a CD, only the front two-channel speakers 162 and 164 and, in some cases, the subwoofer speaker 172 only. Audio is output.
In this case, no sound is output from the center speaker 166 and the rear speakers 168 and 170. For example, when playing a 2-channel audio signal using a 5.1 channel (L, R, C, SL, SR, LFE) audio playback system, two of the 5.1 channels (L, R ) Audio signals are output only from the system, and the remaining 3.1 channels (C, SL, SR, LFE) are not operating.

FIG. 8 is a perspective view showing a configuration of a speaker 50 with a built-in amplifier in which the transformer device 8 of the present embodiment is incorporated.
The amplifier built-in type speaker 50 is used as the subwoofer speaker 172 of the speaker system 160 described above.
The amplifier built-in speaker 50 includes an enclosure 52, a speaker unit 54, a substrate 56, a transformer device 8, and the like.
The enclosure 52 has a rectangular parallelepiped shape.
The speaker unit 54 is attached to the front wall of the enclosure 52 inside the enclosure 52. In the present embodiment, the speaker unit 54 is configured to reproduce sound having a low frequency.
The board 56 is incorporated in the enclosure 52, and amplifies an audio signal supplied from the outside and supplies it to the speaker unit 54 to generate sound from the speaker unit 54, and supplies power to the amplifier unit. And a power supply unit to supply.
The transformer device 8 is attached to a frame plate 58 (attached portion 2) provided inside the enclosure 52, transforms an AC power supplied from the outside, and supplies the AC power to the power supply unit.
Specifically, the transformer device 8 is attached to the frame plate 58 via the mounting plate 20 by screwing the screw inserted through the screw insertion hole 2402 of the mounting plate 20 of the transformer device 8 into the frame plate 58.

By applying the transformer device 8 of the present invention to such a speaker with a built-in amplifier 50, it is possible to surely prevent generation of vibration noise (billing sound) from the transformer device 8, so that the amplifier has excellent sound quality. The built-in speaker 50 can be realized.
In particular, when low-frequency sound is generated from the speaker unit 54, there is a concern that the first plate portion 22 of the mounting plate 20 of the transformer device 8 is likely to resonate due to the sound, but the transformer device of the present invention. The use of 8 can advantageously prevent the generation of vibration noise.

In the present embodiment, the case where the second plate portion 24 is provided on both sides of the first plate portion 22 has been described. However, the second plate portion 24 is provided on one side of the first plate portion 22. Or provided on each of the four sides of the second plate portion 24, and various conventionally known structures can be adopted for the configuration of the second plate portion 24.
In the present embodiment, the case where the transformer device 8 is applied to the speaker with built-in amplifier 50 has been described. However, the transformer device 8 is not limited to that incorporated into the speaker with built-in amplifier 50, and various audio devices can be used. Of course, it can be applied to equipment and electronic equipment.

It is a front view of the transformer device 8 of the present embodiment. It is A arrow directional view of FIG. FIG. 5 is an explanatory view of attachment of the transformer device 8. It is a block diagram which shows the structure of an optical disk player. It is a block diagram which shows the structure of a signal detection part, a signal processing, and a control part. It is a block diagram which shows the structure of a D / A conversion and amplification part, and an output part. It is a perspective view which shows the speaker system of an output part. It is a perspective view which shows the structure of the amplifier built-in type speaker 50 with which the trans | transformer apparatus 8 was integrated.

Explanation of symbols

  8 ... Transformer device, 10 ... Transformer, 12 ... Core, 12B ... Bottom surface, 20 ... Mounting plate, 22 ... First plate portion, 24 ... Second plate portion, 26 ... Convex portion , 2602 ... tip, S ... gap.

Claims (5)

A transformer device with a mounting plate attached to the bottom of the core,
The mounting plate is a first plate portion to which the bottom surface is attached, and a second plate for mounting the transformer to a mounting location located at a location displaced in the thickness direction of the first plate portion. And
The first plate portion is provided with a plurality of convex portions protruding in a direction opposite to the second plate portion,
The core is attached to the mounting plate by attaching the tip of each convex portion to the bottom surface by welding,
A gap having a dimension corresponding to the height of the convex portion is secured between the first plate portion excluding the convex portion and the bottom surface.
A transformer device characterized by that. The convex portion is formed to protrude from the first plate portion into a cylindrical shape by press work,
The attachment by welding is made between the inside of the cylindrical portion at the tip of the convex portion and the bottom surface,
The transformer device according to claim 1. The gap is secured between the entire area of the first plate part excluding the convex part and the bottom surface,
The transformer device according to claim 1. The attachment plate has leg pieces extending on both sides of the first plate portion in a direction intersecting the first plate portion,
The second plate portion is connected to an end portion of each leg piece portion and is parallel to the first plate portion,
The transformer device according to claim 1. The second plate is attached to a frame plate inside the speaker enclosure;
The transformer device according to claim 1.

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