JP2007097000A - Speaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker unit capable of improving rigidness (Young's modulus) of a diaphragm and internal loss by using Japanese lacquer for the speaker unit, and attaining natural and high-fidelity reproduction by improving a damping effect of a frame etc. <P>SOLUTION: The speaker unit comprises a diaphragm in which one kind of Japanese lacquer layer or a plurality of kinds of Japanese lacquer layers having different thickness in the internal and external peripheries is formed on its surface; and a frame etc. coated with Japanese lacquer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a method for manufacturing a speaker unit.

The characteristics required for the speaker diaphragm include high rigidity (Young's modulus), low specific gravity, and high internal loss. Paper has been used so far because it can be configured with an appropriate balance. In recent years, metals, synthetic resins, or composite materials thereof are also used.

In general, a material having high rigidity tends to have insufficient internal loss, and a material having large internal loss tends to have insufficient rigidity. For this reason, conventionally, there have been many attempts to solve the problem by the shape and size of the diaphragm, intentional resonance, a device such as an enclosure, and electrical correction, and a more appropriate diaphragm is still desired.
JP 2003-348687 A JP 2004-193716 A

Lacquer is a natural material and an improved material for it, but it tends to be more susceptible to human rashes, and it tends to have an image that is difficult to handle because it is sensitive to the control of ambient temperature and humidity for curing. However, before curing, it is excellent as a coating material due to its ductility, impregnation properties, and affinity with paper, the volume change before and after curing is relatively small, and after curing it is relatively hard and lightweight, and it has moderate internal loss It is. In addition, lacquer has a unique hue, luster, transparency and touch, and it is desired to expand the use of lacquer as a natural material.
The present invention has been made to solve the problem of the speaker diaphragm, and an object of the present invention is to provide a speaker unit that can reproduce more naturally and with high fidelity by utilizing the characteristics of lacquer. Therefore, it is intended to expand the use of lacquer.

As a means for achieving the above object, in the speaker diaphragm according to claim 1 of the present invention, the base material is paper, the raw lacquer is applied and then cured, and this is repeated a plurality of times, resulting in appropriate rigidity and internal loss. To do.

The speaker diaphragm according to claim 2, wherein the base material is paper, and raw lacquer is applied after curing, then black lacquer or lacquer containing an inorganic additive is applied and then cured, and this is repeated as many times as necessary. The structure is suitable for rigidity and internal loss.

The speaker diaphragm according to claim 3 is configured such that the base material is paper and the raw lacquer is thickened as the center is applied after curing, or the number of times of coating is increased as the center portion is repeated to provide appropriate rigidity and internal loss.

In the speaker unit according to the fourth aspect, the lacquer is applied to the frame of the unit or the magnet after the lacquer is applied and cured, and this is repeated so that a necessary damping effect appears.

In the speaker diaphragm of the present invention, due to the high rigidity of the lacquer-cured layer and the appropriate internal loss, the natural sound of the diaphragm can be reduced and a diaphragm with high fidelity can be obtained.

The balance between the rigidity of the diaphragm and the internal loss can be adjusted by increasing or decreasing the number of lacquer applications.

By coating multiple types of lacquer, the balance between the rigidity and internal loss of the diaphragm can be adjusted, and the hue can also be adjusted.

By separately painting the vicinity of the center and the outer periphery of the diaphragm, for example, the center can be adjusted to increase its rigidity.

As described above, the rigidity and internal loss of the speaker diaphragm can be improved in a well-balanced manner, so that the natural vibration of the diaphragm is suppressed, split resonance is suppressed, thereby reducing the distortion of the reproduced sound and the reproduction frequency. The width can be enlarged.

The speaker unit frame, magnets, etc. can exert a damping effect by properly applying lacquer. Thereby, the effect which suppresses the frame vibration transmitted from the diaphragm etc. is acquired, and the incidental sound from a flame | frame can be suppressed.

Hereinafter, the form which implement | achieves the speaker unit of this invention based on drawing is demonstrated.

As shown in FIG. 1, the speaker diaphragm of this patent is formed by laminating a base material 1 made mainly of paper or the like and lacquer 2. The base material 1 is preferably a material having a good affinity with lacquer, and when the lacquer 1 is applied, the base material 1 should appropriately soak into the base material 1 and be firmly attached. As the material of the base material 1 having good affinity with the lacquer 2, papers such as Japanese paper are particularly suitable, but other materials may be used as long as there is no functional problem. The smoothness of the surface of the substrate 1 should not be too high in order to improve the adhesion with the lacquer 2. Moreover, it is good to set it as the mass of the appropriate base material 1 with the lacquer 2 in consideration of the mass after a structure.

Lacquer 2 can be raw lacquer, refined lacquer, color lacquer, and the like, but is determined in consideration of the hardness and hue after curing. For application, a lacquer-only brush or the like is usually used, but this does not apply unless there is a functional problem. After application, it is cured and cured in an atmosphere suitable for curing the lacquer 2. At this time, care should be taken not to disturb the coil. Usually, lacquer is applied and cured a plurality of times until the required lacquer 2 thickness is obtained.

At this time, as shown in FIG. 2, the applied lacquer may be used by laminating lacquer 3 having different properties depending on the requirements of rigidity, internal loss, hue, and the like. Ordinary lacquer reaches the required hardness in several tens of hours after application, but after that it is considered that the hardness gradually increases over several months. Moreover, in order to prevent a user's rash by lacquer, it is good to give the curing period of several months after the last application.

When applying the lacquer 2, as shown in FIG. 3, when the lacquer 2 of the speaker diaphragm is thick at the center and thin at the outer periphery, the lacquer 2 is applied with a low viscosity and the diaphragm is placed on its back It is cured and cured, and this is repeated as many times as necessary, or the number of coatings at the central part and the outer peripheral part is made different, or the viscosity of the lacquer applied at the central part and the outer peripheral part is made different.

In designing the speaker system, the mass of lacquer 2 or lacquer 3 applied to the speaker diaphragm is reduced due to a decrease in the inherent moisture as it hardens, and then increases due to the supply of oxygen in the atmosphere. To do. Moreover, since ordinary lacquer is deteriorated by ultraviolet rays, ultraviolet rays from direct sunlight and fluorescent lamps are avoided as much as possible.

Next, a speaker unit according to the second embodiment is shown in FIG.
In this example, the lacquer 2 is repeatedly applied and cured on the front surface, the inner frame, the back surface, and the magnet of the frame 5 until the thickness is sincerely necessary. The material of the frame 5 is iron, aluminum or the like, but the surface of the frame 5 to which the lacquer 2 is applied should reduce the smoothness as much as possible and remove the oil on the surface in order to enhance the adhesion with the lacquer 2. .

After application, it is cured and cured in an atmosphere suitable for curing the lacquer 2. At this time, care should be taken not to disturb the coil. Usually, lacquer is applied and cured a plurality of times until the required lacquer 2 thickness is obtained. Ordinary lacquer reaches the required hardness in several tens of hours after application, but after that it is considered that the hardness gradually increases over several months. Moreover, in order to prevent a user's rash by lacquer, it is good to give the curing period of several months after the last application.

When making the lacquer 2 into a multilayer, you may laminate | stack the lacquer of a different property similarly to FIG. Further, the lacquer 2 applied to the front surface of the frame is determined in consideration of the hue of the entire unit and the hue of the enclosure to be attached. For the lacquer 2 that is hidden in the enclosure, it is sufficient to satisfy the necessary internal loss.

FIG. 3 is an enlarged cross-sectional view of the speaker diaphragm according to the first embodiment. FIG. 3 is an enlarged cross-sectional view of the speaker diaphragm according to the first embodiment. 1 is a cross-sectional view of a speaker unit according to Embodiment 1. FIG. 6 is a cross-sectional view of a speaker unit according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Lacquer 3 Lacquer of the property different from lacquer 2 4 Diaphragm 5 Frame

Claims (4)

A loudspeaker diaphragm made of lacquer, made by combining lacquer on a base material, or composed only of lacquer. A loudspeaker diaphragm composed of multiple types of lacquer to be used, depending on the type of additive and the presence or absence of the additive, or components such as urushiol. 3. A speaker diaphragm constituted by a material and a thickness that are different depending on a part of the diaphragm when realizing claim 1 or claim 2. A speaker unit constructed by applying lacquer to a frame or magnet.

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