JP2007005992A - Speaker diaphragm, speaker using the same, and electronic device and apparatus using the speaker - Google Patents

Abstract

The present invention relates to a loudspeaker diaphragm used in audio equipment, a loudspeaker using the loudspeaker, and an electronic device and apparatus using the loudspeaker, and realizes stable sound quality, characteristics, and appearance of the loudspeaker. It can be made to.
The present invention provides a diaphragm for a speaker that includes at least an amphoteric polyacrylamide resin-based paper strengthening agent as an internal additive, thereby improving the fixing regardless of the water quality. Thus, the sound quality, characteristics, and appearance of a stable speaker can be realized.
[Selection] Figure 1

Description

  The present invention relates to a speaker diaphragm used in various audio equipment and video equipment, and to electronic equipment and devices such as a speaker, a stereo set, and a television set using the diaphragm.

  Since the paper diaphragm has a small specific gravity and an appropriate internal loss, it is still a mainstream speaker diaphragm.

  Conventional paper diaphragms usually use aluminum sulfate in the paper making process to stabilize the quality.

  Since these speaker diaphragms are important components that determine the sound quality of audio equipment, many studies have been conducted on prescriptions and production methods for stably producing paper diaphragms.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2003-230197 A

  Conventional paper diaphragms are fixed to pulp fibers by ionic bonds via aluminum sulfate. This is due to the water quality, especially the pH, metal ion concentration, and the amount of organic substances contained, greatly changing the form of fixing, and thus improving the physical properties of the diaphragm. There is a problem that the sound quality variation and the appearance variation of the speaker are caused to vary.

  The factor that determines the characteristics of the paper diaphragm is the chemical treatment process, and the variation in the chemical fixing here leads to the variation in the sound quality and appearance of the speaker.

  For this reason, in order to eliminate variation in chemical fixation in the chemical treatment process, by selecting a chemical that can self-fix by hydrogen bonding with cellulose in the pulp, it is possible to eliminate variations due to water quality of fixation, etc. It is a thing.

  That is, the speaker diaphragm is configured to include at least an amphoteric polyacrylamide resin-based paper strength agent as an internal additive.

  With this configuration, fixing is improved regardless of water quality, and variations in physical properties of the diaphragm can be suppressed. As a result, variations in sound quality and appearance of the speakers can be reduced.

  As described above, according to the present invention, the speaker diaphragm includes at least an amphoteric polyacrylamide resin-based paper strength agent as an internal additive.

  With this configuration, fixing can be improved regardless of the water quality, and variations in the physical properties of the diaphragm can be suppressed, so that stable sound quality and appearance of the speaker can be realized without variations.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The invention according to the first to sixth aspects of the present invention will be described below with reference to the first embodiment.

  FIG. 1 shows a cross-sectional view of a speaker diaphragm according to an embodiment of the present invention.

  As shown in FIG. 1, since the diaphragm 27 is used as a speaker diaphragm, the shape of the diaphragm 27 is formed by making paper into a conical shape.

  In terms of material, pulp is 50% or more by weight, and a speaker diaphragm is formed using an amphoteric polyacrylamide resin-based paper strength agent as an internal additive.

  Here, the amphoteric polyacrylamide resin is called a paper strength agent that fixes to paper and improves the physical properties of the paper, and is a compound capable of hydrogen bonding with cellulose.

  This amphoteric polyacrylamide resin forms a network with good hydrogen bonds with cellulose, and has a remarkable effect as a pulp reinforcing agent in diaphragms in which the speed of sound (Young's modulus E / square root of density ρ) is important. .

  With this configuration, it is possible to improve the fixing regardless of the water quality, and it is possible to obtain a speaker diaphragm that can suppress physical property variations of the diaphragm, and thus can realize stable sound quality and appearance without variation. .

  Moreover, it is good also as a structure using the dye fixing agent of a cationic polyvinylamine type compound, and an anionic dye as a coloring agent in this diaphragm for speakers.

  These are dye fixing agents and dyes for coloring, and coloring with normal dyes is easily affected by water quality and appearance quality is difficult to stabilize.

  With this configuration, the fixability of the dye when coloring is improved, and it is less susceptible to water quality. Therefore, this combination is optimal for a speaker diaphragm that is an appearance product.

  Further, the speaker diaphragm may be configured to use a styrene polymer as a surface sizing agent.

  With this configuration, a speaker diaphragm having a large surface modification effect can be obtained.

  Of course, there is no problem with using a sizing agent such as an alkyl ketene dimer, alkenyl succinic anhydride, or neutral rosin emulsion as a sizing agent, but the surface modification effect can be further enhanced by using a styrene polymer. .

  Moreover, it is good also as a structure which made polyamide and epichlorohydrin react and was used for this diaphragm for speakers as a wet paper strength agent.

  By adopting this configuration, the fixing property can be further improved by modifying the polyacrylamide resin with epichlorohydrin in combination with the amphoteric polyacrylamide resin-based paper strength agent described above, and the effect is extremely high. large.

  Furthermore, this invention does not specifically limit use of the well-known additive, inorganic filler, etc. which are added to a diaphragm.

  An example of the best mode for carrying out the present invention will be shown below.

  As the best mode of the present invention, after fixing to a pulp beaten with 0.5 to 3% of cationic vinylamine in solid content and 2 to 15% of dye in solid content, the solid content is 0.3 to 0.3%. 2% amphoteric polyacrylamide was added as a dry paper strength agent, then 0.5-3% epichlorohydrin-modified polyacrylamide in solid content was added as a wet paper strength agent, followed by 1-5% surface size of styrenic polymer. The method used as an agent is preferred.

(Examples 1, 2, and 3)
To PUKP pulp beaten to 600 ml, 0.5% of a dye fixing agent, Catiofast VSH (manufactured by BAF Japan), and 8% of an anionic dye were added. After that, DS4374 (amphoteric polyacrylamide manufactured by Starlight PMC) was 0.5% solids, WS552 (epichlorohydrin modified polyacrylamide manufactured by Starlight PMS) was 1.2% solids, and SS2072 (styrene polymer manufactured by Starlight PMC) was solid. Paper cones were made by sequentially adding 3% in minutes.

  Three types of water were used: soft water with German hardness of 2 DH, hard water with 20 DH, and water containing 20 mg / L of organic matter.

(Comparative Examples 1, 2, 3)
It implemented similarly by the method using the conventional aluminum sulfate.
result:
The burst strength in the low pressure Murren method described in JISP8112 is
Example 1: ² DH water 3.1 kg / cm ²
Example 2: 20 DH water 3.1 kg / cm ²
Example 3: Water rich in organic matter 3.1 kg / cm ²
Comparative Example 1: 2DH water 3.0 kg / cm ²
Comparative Example 2: 20 DH water 1.2 kg / cm ²
Comparative Example 3: Water with a lot of organic matter 1.8 kg / cm ²
In addition, as a result of evaluating the sound quality by incorporating each into a speaker, Examples 1 to 3 and Comparative Example 1 had almost the same sound quality, but Comparative Examples 2 and 3 had low sound pressure in the high sound range and were not powerful. It became a thing.

  From the above results, it is possible to obtain a speaker diaphragm that improves the fixing regardless of the water quality, and demonstrates the effectiveness of the present invention that can realize a stable sound quality and characteristics of the speaker, as well as an appearance. I was able to.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the seventh aspect of the present invention.

  FIG. 2 shows a cross-sectional view of a speaker according to an embodiment of the present invention.

  As shown in FIG. 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute an internal magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of any one of the diaphragms 27 according to claims 1 to 6 is bonded to the peripheral edge of the frame 26 via an edge 29. One end of the voice coil 28 is coupled to the inner peripheral portion of the diaphragm 27 and the opposite end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  In the above, the speaker having the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this, and may be applied to a speaker having an outer magnet type magnetic circuit.

  Furthermore, the present invention can also be applied to a small speaker for a cellular phone in which the diaphragm 27 and the edge 29 are integrated.

  With this configuration, as described in Embodiment 1, it is possible to obtain a speaker diaphragm that improves fixing regardless of water quality, and a speaker that can achieve stable sound quality, characteristics, and appearance. Obtainable.

(Embodiment 3)
Hereinafter, the invention according to the eighth aspect of the present invention will be described with reference to the third embodiment.

  FIG. 3 is an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.

  As shown in FIG. 3, the speaker system of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 which is an amplifying means for an electric signal input to the speaker 30 and a source input to the amplifier 42 And an audio mini component system 44 that is an electronic device.

  With this configuration, it is possible to obtain electronic devices such as a speaker system and an audio mini-component system that can realize stable sound quality and characteristics that have not been realized in the past, and an external appearance.

(Embodiment 4)
Hereinafter, the fourth aspect of the present invention will be described with reference to the fourth embodiment.

  FIG. 4 shows a cross-sectional view of an automobile 50 which is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 4, an automobile 50 is configured by incorporating the speaker 30 of the present invention into a rear tray or a front panel and using it as a part of car navigation or car audio.

  By adopting this configuration, it is possible to realize stable sound quality and characteristics and appearance of the speaker 30, and it is possible to improve the performance and quality of a device such as an automobile equipped with the speaker 30.

  The speaker diaphragm, the speaker, the electronic device, and the device according to the present invention are applied to electronic devices such as audiovisual equipment and information communication devices that require stable sound quality and characteristics, and further to the appearance, and further to devices such as automobiles. Useful for.

Sectional drawing of the diaphragm for speakers in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention 1 is an external view of an electronic device according to an embodiment of the present invention. Sectional drawing of the apparatus in one embodiment of this invention

Explanation of symbols

21 Magnet 22 Upper Plate 23 York 24 Magnetic Circuit 25 Magnetic Gap 26 Frame 27 Diaphragm 28 Voice Coil 29 Edge 30 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini Component System 50 Automobile

Claims (9)

A speaker diaphragm including 50% or more by weight of pulp, wherein the speaker diaphragm includes at least an amphoteric polyacrylamide resin-based paper strength agent as an internal additive. The speaker diaphragm according to claim 1, wherein a dye fixing agent of a cationic polyvinylamine compound and an anionic dye are used as the colorant. 3. The speaker diaphragm according to claim 1, wherein a styrene polymer is used as the surface sizing agent. The speaker diaphragm according to any one of claims 1 to 3, wherein polyamide and epichlorohydrin are reacted as a wet paper strength agent. The speaker diaphragm according to any one of claims 1 to 4, wherein the speaker diaphragm is formed by papermaking. 6. The speaker diaphragm according to claim 1, wherein the speaker diaphragm is formed in a conical shape. A frame coupled to a magnetic circuit, a diaphragm according to any one of claims 1 to 6 coupled to an outer peripheral portion of the frame, and the diaphragm coupled to the diaphragm, and part of the diaphragm being the magnetic A speaker composed of a voice coil arranged in a magnetic gap of a circuit. An electronic device comprising the speaker according to claim 7 and at least an amplifier circuit for an input signal to the speaker. An apparatus in which the speaker according to claim 7 is mounted on a moving means.

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