JPH0423696A - Speaker - Google Patents

Abstract

PURPOSE:To prevent scattering minute dust or the like by providing an air-tight film or board to a front face of a diaphragm without exposing the diaphragm against a voice radiation space and fitting an air-tight film or board thereto via a gasket or a frame of the speaker. CONSTITUTION:A flange 10a is provided to an outer circumference of a frame 10 and an external circumference 7a of an edge 7 is fixed to the flange 10a and a gasket 11 is fitted on it around the flange 10a. An air-tight film 12 is tensed to the end face of the gasket 11. Through the constitution above, the diaphragm 6 of the speaker 1 is not directly exposed and the vibration of the diaphragm 6 radiates externally through the air-tight film 12. Since the front face of the speaker 1 is shielded by the air-tight film 12, even when each component of the speaker 1 is deteriorated, the dust resulting from the component is not scattered to the outside of the speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a speaker used in, for example, a clean room.

(Prior Art) Conventionally, as a speaker used in a clean room etc., there is Japanese Patent Application Laid-Open No. 1-300798, as shown in FIG. The box body 1 which is provided and fits into this opening 102
03, and a flange 1 provided on the outer periphery of this box body 103.
04, the box body 103 is fixed to the ceiling 101, the speaker 107 is attached to the speaker mounting opening 106 of the equipment mounting plate 105 provided at the rear of this box body 103, and the frame body 111 is attached to the front side of this box body 103. A porous decorative board 112 was attached to the frame 111. A resin sheet 113 was adhered to the back side of this decorative board 112, and a copper mesh 114 was provided on the top surface.

In this prior example, the resin sheet 113 was designed to prevent dust from being emitted from the speaker, thereby preventing deterioration of indoor air cleanliness.

(Problem to be Solved by the Invention) However, the conventional speaker described above is configured such that the sound emitted from the diaphragm of the speaker passes through the porous sound holes of the decorative board 112 to the outside. There is.

However, normally, porous sound holes are very prone to attracting and accumulating dirt and dust, and when the speaker is driven, the dust and dirt will be scattered from that part to the surrounding area, making it not necessarily effective in a clean room. cannot be applied to,
There was a problem.

Furthermore, when cleaning the front surface of the speaker device to remove dirt and dust, there is a problem in that it is difficult to clean the decorative board 112 that has the sound hole portion of the small hole, and there is a risk of scattering dust and dust during cleaning. Ta.

Further, the speaker device includes a speaker 107, a device mounting plate 105 on which the speaker 107 is mounted, and an opening 102 in the ceiling 101 to which the device mounting plate 105 is attached.
It consists of a box body 103 configured to be attached to a box body 103, a decorative panel 112 of a separate structure that is attached to the bottom surface of this box body 103, etc., and the number of component parts is large, resulting in high cost as a whole, and assembly is also complicated. There was also a lK title.

The present invention has been made in view of the above circumstances, and its purpose is to almost completely prevent the scattering of fine dust, including those emitted from speakers, and to
It has a simple configuration, is easy to handle, and can be expected to be cost-effective.
Moreover, it is an attempt to provide a speaker with less deterioration in characteristics.

(Means for Solving the Problems) In order to achieve the above object, the speaker of the present invention provides an airtight film or plate on the front part of the diaphragm without exposing the diaphragm to the sound radiation space, and The airtight film or plate is attached via a speaker gasket or frame.

Further, the gasket or the frame is provided with an air pressure release hole formed by a diaphragm, and this release hole is located above the ceiling surface.

(Function) The speaker of the present invention configured as described above has an airtight film or plate directly installed in front of the speaker itself, and the speaker including this film and plate is suitable for use in a clean room. When installing the speaker into the ceiling surface, the speaker can be easily attached to the opening using a simple fixing member, and the installation work is easy.

Furthermore, since the number of parts is small and the configuration is simple, manufacturing is easy and costs are low.

In addition, those with discharge holes above the ceiling can release air pressure during large vibrations that occur inside the diaphragm, and can be used even with large inputs, and can significantly degrade sound quality characteristics. I won't let you.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 6.

In FIG. 1, l is a speaker, and this speaker 1 has a magnetic circuit consisting of a yoke 2, a magnetite 3, a plate 4,
Voice coil 5, vibration vi6, edge part 7, damper 8
, a diaphragm portion consisting of a center cap 9, and a frame 10 that holds the voice coil 5 within the magnetic gap between the yoke 2 and the plate 4 of the magnetic circuit and supports the vibration of the diaphragm 6. A flange 10a is provided on the outer periphery of this frame IO, and the outer periphery 7a of the edge portion 7 is fixed to this flange 10a.
A gasket 11 is mounted thereon around the flange 10a. This gasket 11 is attached to the flange 10
An airtight film 12 is stretched over the end surface of the gasket 11.

With this configuration, the diaphragm 6 of the speaker l is not directly exposed, and the vibration of the diaphragm 6 is transmitted through the airtight film 1.
2 and is emitted to the outside. Further, since the front side of the speaker 1 is blocked by this airtight film 12, even if the various parts of the speaker 1 deteriorate, they will not be scattered outside the speaker.

Note that the same effect can be obtained by attaching a thin plate made of expanded polystyrene, for example, instead of the airtight film 12.

In Figure 2, the gasket is lengthened to provide a wide space between the diaphragm 6 and the airtight film surface 12, and a discharge hole 14 is provided in the ring-shaped side plate of the gasket 13 located above the ceiling surface. This is an example. This discharge hole 14 is a gas scaler) 1
They are provided at multiple locations around the diaphragm 3 to emit part of the sound pressure of the diaphragm 6 to the outside when the speaker l emits a large volume, thereby preventing any damage to the airtight film 12. Since the air is vented above the ceiling, it does not affect the interior of the clean room.

Further, with this configuration, the input resistance of the speaker can be improved.

FIG. 3 is a cross-sectional view of a speaker having the same configuration as that shown in FIG. A flange 17 is provided, and an airtight film 12 is stretched over this flange 17. By stretching this airtight film 12, exposure of the diaphragm 6 is blocked, and the sound emitted from the vibration Mi, 6 is transmitted to the outside through the airtight film 12 surface, and dust from the speaker 15 is etc. are all prevented from scattering by the airtight film 12.

Figure 4 shows frame 1 of the speaker 15 having the configuration shown in Figure 3.
6, a plurality of discharge holes 18 are provided on the lower side of the flange 17.

The sound pressure-frequency characteristics of the speaker configured in this way are as shown in FIG. The speaker in this figure uses a 0.04 um thick polyethylene film as an airtight film. In addition, general-purpose resin materials such as polyester and vinyl chloride can be used as the material of the film.

In the figure, the vertical axis represents sound pressure (dB) and the horizontal axis represents frequency ().
(Z), and as a result, compared to the conventional speaker characteristics (solid line graph), the sound pressure of the present invention (dotted line graph) is about 10-odd decibels higher around 3000H2, making it easier to hear. It has been shown that

(Effects of the Invention) As explained above, the speaker of the present invention has an airtight film or plate provided on the front part of the diaphragm without exposing the diaphragm to the sound radiation space, and the airtight film or plate. Alternatively, the plate is attached through the speaker gasket or frame, and the gasket or frame is provided with air pressure release holes from the diaphragm, which prevents fine dust, including those emitted from the speaker, from scattering. In addition to completely preventing sound emission, since the sound emitting surface is made of a flat film or plate, it is difficult for dust and dirt to adhere to or accumulate on the surface even after years of use.

Additionally, the surface can be easily cleaned.

Moreover, it has a simple configuration, is easy to assemble and incorporate, and can achieve cost reduction.

Furthermore, there is an effect that there is little deterioration in sound quality, and if there is a discharge hole, it can be used without any problem even when a large input is applied.

Therefore, the speaker of the present invention is suitable for use in clean rooms where precision work is performed, and can also be used in other humid places and normal environments.

Furthermore, the technique of attaching an airtight film or plate to the front surface of the present invention can also be applied to electroacoustic transducers such as headphones and microphones.

[Brief explanation of the drawing]

Figures 1 to 5 rj! J shows an embodiment of the present invention; Fig. 1 is a cross-sectional view of a speaker in which a gasket is covered with an airtight film or plate; Fig. 2 is a cross-sectional view of a speaker in which a gasket is provided with a discharge hole; Figure 4 is a cross-sectional view of a speaker with an airtight film or plate stretched over the frame, Figure 4 is a cross-sectional view of a speaker with emission holes in the frame, Figure 5 is a sound pressure-frequency characteristic diagram of the speaker, and Figure 6 is a diagram of the speaker's sound pressure-frequency characteristics. It is a sectional view of a conventional example. ■, 15・ ・ ・ 6 ・ ・ ・ ・ 1O116・ ・ 11.13・ I2・ ・ ・ ・ ・ 14.18・ ・ ・ ...Speaker・・Diaphragm・・Frame・Gaskent・・Airtight film Or temporary... release hole

Claims (2)

[Claims] (1) An airtight film or plate is provided on the front surface of the diaphragm without exposing the diaphragm to the sound radiation space, and the airtight film or plate is attached via the speaker gasket or frame. A speaker characterized by: (2) The speaker according to claim 1, wherein the gasket or the frame is provided with an air pressure release hole formed by a diaphragm, and the release hole is located above a ceiling surface.