JP5130457B2 - Diaphragm structure - Google Patents

Description

  The present invention relates to a diaphragm structure of a board-mounted component typified by a multi-function vibration actuator.

  Conventionally, it is difficult to use a board-mounted type sound reproducing device represented by a multi-function type vibration actuator having a sound reproducing function and a sensation vibration utterance function, because of its use, a cone-shaped one that requires depth with respect to the diaphragm. A structure such as a dome-shaped diaphragm that can be configured to be relatively thin has been used.

  However, since the dome-type diaphragm uses a structure in which a voice coil is attached to the boundary between the center dome and the sub dome, the phase of the vibration on the center dome side and the vibration on the sub dome side are reversed when the voice coil is driven. There was a problem that some parts would cancel each other out. With regard to such a problem, there is a structure described in Japanese Patent Application Laid-Open No. 2006-109090 (hereinafter described as Patent Document 1), and this problem is solved by increasing the rigidity of the voice coil mounting portion provided in the diaphragm.

  In addition to the above-mentioned Patent Document 1, in the structure described in JP-A-2006-229656 (hereinafter referred to as Patent Document 2), a ring made of a material having lower rigidity is formed on the outer periphery of the central portion of the diaphragm configured separately. By attaching the outer peripheral part and fixing the voice coil to the central part, an effect of improving the diaphragm manufacturing efficiency is obtained.

  In addition, in Patent Document 2, the minimum resonance frequency is suppressed by providing a margin in the vibration limit of the outer peripheral portion without causing abnormal vibration in the central portion by adopting a two-body structure.

JP 2006-109090 A JP 2006-229656 A

  On the other hand, the diaphragm described in Patent Document 1 has a problem that an annular member has to be attached along the boundary shape between the center dome and the sub dome when assembling the diaphragm. In addition, because of the dome shape, it has been difficult to reduce the thickness of the entire diaphragm.

  In addition, the diaphragm described in Patent Document 2 has a problem that rigidity cannot be improved by using a diaphragm other than a resin material such as magnesium because the use of a light-transmitting resin is assumed. During sound reproduction, there was a case where the diaphragm was not rigid enough to cause acoustic distortion.

In view of the problems described above, the present application provides a diaphragm that can be easily assembled regardless of the shape of the diaphragm, can maintain rigidity regardless of the material of the diaphragm, and suppresses acoustic distortion in a wide band. The purpose is that.

  In order to solve the above problem, the invention according to claim 1 uses a structure in which the voice coil mounting portion is formed directly on the integrally formed diaphragm base and the center cap is overlapped by filling with a reinforcing material. For this reason, it is possible to obtain the effect of facilitating the assembly of the entire diaphragm by forming the voice coil mounting part integrally with the diaphragm, as well as improving the rigidity of the diaphragm by arranging the diaphragms in the thickness direction. it can.

  In addition, the back surface of the mounting portion is filled with a reinforcing material to form a reinforcing portion, and then the center cap is overlapped, so that the rigidity of the diaphragm including the voice coil mounting portion is further added to the above effect. In addition to being able to improve, it is possible to prevent the occurrence of acoustic distortion by suppressing the divided vibration inside the diaphragm.

  In addition, by placing the center cap directly above the boil coil mounting part, the acoustic characteristics during sound signal reproduction are set according to the thickness and material of the center cap, and vibration attenuation between the voice coil and the diaphragm is reduced. can do.

  According to a second aspect of the present invention, there is provided a method of re-forming a voice coil in a predetermined shape after being wound into a cylindrical shape and uniforming a line product ratio with respect to the voice coil attached to the diaphragm base. It is used, and after winding with a uniform tension, it can be shaped into an arbitrary shape to stabilize the line product ratio in the voice coil, and the diaphragm can be vibrated with little variation after being attached to the diaphragm. .

  Further, in the invention according to claim 3, by using a flat plate-like shape for the center cap, the thickness of the entire diaphragm is suppressed, and the variation in output sound pressure at each frequency is flattened. It is possible to reduce the distortion.

  The best embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 shows a perspective view of a multi-function vibration actuator equipped with a diaphragm used in this embodiment.

  As can be seen from the perspective view shown in FIG. 1, the multi-function vibration actuator used in this embodiment has a configuration using a square housing 7, and corresponds to the planar shape of the housing 7. The mounting diaphragm has a rectangular planar shape.

  For this reason, it is possible to increase the sound pressure by ensuring a large surface area of the speaker portion, and in terms of mounting space on the mounting substrate, compared to the conventionally used cylindrical multi-function vibration actuator It becomes possible to arrange more efficiently than the case where it comprises.

  2 is a side sectional view as seen from the direction of AA ′ in FIG. 1, an exploded perspective view shown in FIG. 3, and a side sectional view around the voice coil 3 shown in FIG. As can be seen, the multi-function vibration actuator used in the present embodiment has two voice coils 3 arranged in the magnetic gap G by selectively using the input frequency to the voice coil 3 input from the power supply terminal 10. A dynamic structure that vibrates a body-structured diaphragm and a magnetic circuit unit including a pole piece 4, a magnet 5, a yoke 6, and a suspension 7 housed in a housing composed of a housing 8 and a cover 9 was used. .

  Further, the two-body diaphragm used in the present embodiment is filled with a reinforcing material C made of a resin material on the back surface of the voice coil mounting portion B provided on the diaphragm base 2, and is a flat plate shape made of the same resin material. The structure closed by the center cap 1 was used. For this reason, the rigidity of the diaphragm comprising the diaphragm base 2 and the center cap 1 can be improved by the reinforcing portion formed by the filled reinforcing material C.

  In addition to the above effects, the voice coil 3 used in the present embodiment is formed into a rectangular shape shown in the figure after being wound into a cylindrical shape, and compared with a voice coil wound into a conventional direct rectangular shape. As a result, it was possible to obtain stable acoustic and vibration characteristics by using a voice coil with little variation in the line product ratio.

  Further, in this embodiment, an annular diaphragm structure D is provided in the diaphragm base 2 to increase the amplitude during sound reproduction of the center cap 1, and a speaker of the diaphragm base 2 is provided by a rising portion E provided at a place where the diaphragm base 2 is attached. In addition to the effect obtained by using the rectangular planar shape, the sound pressure at the time of sound reproduction could be further increased.

As described above, by using the diaphragm structure described in this embodiment, it is possible to obtain a stable acoustic characteristic by reducing acoustic distortion such as divided vibration by reducing loss during voice coil driving. .

The perspective view of the multifunction type vibration actuator used in the Example of this invention 1 is a side sectional view as seen from the direction A-A ′ of FIG. 1. Exploded perspective view of a multifunctional actuator used in an embodiment of the present invention Enlarged view of the vicinity of the voice coil in the side cross-sectional view shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center cap 2 Diaphragm base 3 Voice coil 4 Pole piece 5 Magnet 6 Yoke 7 Suspension 8 Housing 9 Cover 10 Terminal B Voice coil attachment part C Reinforcement material D Diaphragm structure E Standing part G Magnetic gap

Claims (3)

An acoustic diaphragm driven by a voice coil, a diaphragm base provided with a recess on the back surface of the voice coil mounting portion disposed in the center ;
A reinforcing part formed by filling the recess with a reinforcing material;
A diaphragm comprising: a center cap attached to a central portion of the diaphragm base portion and closing the recess portion.
The method for manufacturing a diaphragm according to claim 1, wherein the voice coil is formed into a predetermined shape after being wound into a cylindrical shape and attached to the diaphragm.
The diaphragm according to claim 1 or 2, wherein the center cap is formed in a flat plate shape.

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