JP2545873Y2 - Headphone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a headphone device provided with a dome-shaped speaker having a roll edge on the outer periphery of a dome-shaped center cap.

[Technical background and problems of the invention]

2. Description of the Related Art Conventionally, as a type of a speaker employed in a headphone device, a dome-shaped speaker having a roll edge on the outer periphery of a dome-shaped center cap and a cone-shaped speaker having an edge on the outer periphery of a cone-shaped diaphragm are known. .

On the other hand, the speaker of the headphone device has a limited resonance frequency due to its function and form, so the aperture used is limited.
fo also had to be low enough for its performance. For this reason, in the dome type speaker, the area of the roll edge must be set larger than the area of the dome part in order to lower the resonance frequency fo.

Therefore, in the dome type speaker, the roll edge swings and the outer periphery is fixed, so that the reflection of vibration occurs, resonates at a specific frequency, and an abnormal sound is generated. There was a disadvantage that the influence was great. As the width of the roll edge is wider, the intensity of the abnormal sound is reduced to a lower frequency as the width of the roll edge is increased, and the abnormal sound is easily perceived.

In the case of a cone-type speaker, the greater the ratio of the vibration area of the diaphragm to the area of the edge, the more the occurrence of abnormal sound from the edge can be prevented. Therefore, the ratio is close to the area ratio between the dome portion and the roll edge portion of the dome type speaker described above, and there is a problem with abnormal sound at the edge portion.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and has as its object to provide a headphone device in which the resonance frequency fo is sufficiently reduced and the occurrence of abnormal sounds from edges is prevented.

[Outline of the invention]

The headphone device of the present invention uses a dome-shaped speaker having a roll edge on the outer periphery of the center cap, forms a cone diaphragm having a diameter substantially equal to the effective vibration area of the vibration system on the outer periphery of the center cap, and performs cone vibration. The protection plate is provided with an opening below the diameter of the plate.

[Example of the invention]

Hereinafter, an embodiment of the headphone device of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a headphone device of one embodiment, and FIG. 2 is a plan view showing a plane of the headphone device.

In FIGS. 1 and 2, 1 is a center cap, 2 is a roll edge provided on the outer periphery of the center cap 1, and 3 is a cone vibration formed on the outer periphery of the center cap 1 and formed toward the upper direction of the roll edge 2. The plate 4 is a protective plate covering the front surface of the speaker body, and 5 is an opening provided on the protective plate 4 and having a diameter equal to or smaller than the diameter of the cone diaphragm.

That is, the diameter Dp of the opening 5 is equal to the outer diameter of the cone diaphragm 3.
Dc is smaller than Dc, and Dp <Dc.

Reference numeral 6 denotes a voice coil that vibrates the vibration system, 7 denotes a pole, 8 denotes a magnet provided below the pole 7, 9 denotes a yoke frame that forms a magnetic circuit together with the pole 7, 10
Is a terminal connected to the voice coil 6.

The roll edge 2 is formed integrally with the base of the center cap 1 using a 6 μm polyester film, and the cone diaphragm 3 is integrally attached to the base of the center cap with a 10 μm titanium foil. The cone diaphragm 3 has an outer diameter substantially equal to the effective vibration area of the roll edge 2.

Next, the operation of the thus configured headphone device will be described.

When the vibration system of the speaker is vibrated by the voice coil 6, sound pressure generated from the front surface of the center cap 1 and the cone diaphragm 3 is radiated from the opening 5 of the protection plate 4, and
It is conceivable that sound pressure generated from the roll edge 2 and the back surface of the cone diaphragm 3 is radiated from the opening 5 of the protective plate 4 through a gap between the outer periphery of the protect plate 4 and the cone diaphragm 3.
In this configuration, there is no sound pressure radiated through the gap of the cone diaphragm.

That is, the volume that the roll edge 2 shakes and removes and the volume that the back surface of the cone diaphragm 3 shakes and removes are:
Since the diameter of the cone diaphragm 3 is approximately equal to the diameter equal to the effective area of the vibration system, the diameter is the same, and the phase is the same between the roll edge 2 and the rear surface of the cone diaphragm 3.
The opposite is true in the area surrounded by, where no sound pressure is generated. For this reason, the sound pressure from the roll edge 2 is ignored, and the center cap 1 and the cone diaphragm 3
Is radiated from the opening 5.

[Effect of the invention]

As described above, according to the headphone device of the present invention, since the radiation from the roll edge is configured to be practically negligible, the resonance frequency fo can be set low and determined by the center cap and the cone diaphragm. Can be easily designed to the sound quality to be done.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of a headphone device according to the present invention, and FIG. 2 is a plan view thereof. DESCRIPTION OF SYMBOLS 1 ... Center cap 2 ... Roll edge 3 ... Cone diaphragm 4 ... Protective plate 5 ... Opening

Claims (1)

(57) [Scope of request for utility model registration] 1. A headphone device having a roll edge on the outer periphery of a center cap, wherein a cone diaphragm having a diameter substantially equal to an effective vibration area of the vibration system is formed on the outer periphery of the center cap, and A headphone device wherein an opening of a protection plate is provided below the diameter.