JPH0984182A - Edgeless speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edgeless speaker which is capable of reducing the degradation of sound quality and improving reliability by forming projecting and recessing parts on the sliding surface of the opening inner peripheral surface of a speaker frame or the sliding surface of a sliding part. SOLUTION: To the tip part of a ring 16, seal material 20 as a freely deformable sliding part composed of elastic bodies or fiber porous members is stuck. The seal material 20 seals the whole space between a diaphragm 13 or the ring 16 and the internal surface 9a of a frame 9. On the sliding surface to be the inside surface 9a of the frame 9 with which the slidable contact surface 21 of the seal material 20 comes into slidable contact, plural small projecting and recessing parts are provided. In this constitution, when the diaphragm 13 vibrates, the slidability of the seal material 20 is kept in an excellent state, because the slidable contact surface 21 of the seal material 20 comes into slidably contact with the slidable surface to be the inside surface 9a of the frame 9, slight air circulation of the degree that the degradation of sound quality is not caused by the projecting and recessing parts 30 is generated at the time, because the slidable contact part 21 of the slidable contact surface 21 of the seal material 20 and the slidable contact surface evade the attraction phenomenon of the seal material 20 generated in a vacuum state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edgeless speaker which is suitable for a bass speaker by removing an annular edge attached between the inner peripheral surface of the opening of the speaker frame and the outer peripheral surface of the diaphragm. .

[0002]

2. Description of the Related Art As a bass speaker in recent years,
It is a small-diameter speaker, and the ring-shaped edge attached between the inner peripheral surface of the opening of the speaker frame and the outer peripheral surface of the diaphragm is removed so that sufficient sound pressure can be obtained and sound distortion is reduced. An edgeless speaker having a configuration is known.

That is, by forming a minute gap (annular space) having a width of about 1 mm between the inner peripheral surface of the opening of the speaker frame and the outer peripheral surface of the ring around the diaphragm, the diaphragm vibrates smoothly. Not only that, the air flow around the diaphragm is obstructed, and the speaker functions as a bass speaker.

FIG. 6 shows an example of the configuration of such an edgeless speaker. The cancel magnet 2,
The magnetic circuit 1 is composed of the pole yoke 3, the magnet 4, and the plate 5. In the magnetic gap between the pole piece 3a and the plate 5, a voice coil 8 attached to the bobbin 7 is interposed.

The upper and lower stages of the bobbin 7 are supported by an upper damper 10 and a lower damper 11, one end of which is attached to the frame 9. Further, on the upper stage of the bobbin 7, there is a diaphragm 13 having a center cap 12 attached to the center thereof.
The central hole 14 is fixed. The ring 16 attached to the outer peripheral end of the diaphragm 13 and the inner surface 9 of the frame 9
A width of about 1 m is provided between the ring 16 and a so that the ring 16 does not contact the inner surface 9a of the frame 9 when the diaphragm 13 vibrates.
An annular space of about m is provided.

When driving, the upper damper 10
When the diaphragm 13 vibrates as the bobbin 7 supported by the lower damper 11 moves up and down, the diaphragm 13
Since the ring 16 at the outer peripheral end moves along the inner surface 9a of the frame 9 without making contact, the vibration amplitude of the diaphragm 13 is increased, so that sufficient sound pressure can be obtained even with a small-diameter speaker. It is possible to obtain low-pitched sound with low sound distortion.

[0007]

By the way, in the above-mentioned edgeless speaker, the ring 16 and the frame 9 are provided.
By providing an annular space between the inner surface 9a and the inner surface 9a of the frame 9, contact of the ring 16 with the inner surface 9a of the frame 9 can be avoided. Strict mounting accuracy is required, and undesired wind noise is generated due to the circulation of air generated in the annular space due to the vibration of the diaphragm 13, resulting in sound quality deterioration (performance deterioration).
There is a problem that invites.

Therefore, in order to solve these problems, for example, as shown in FIG. 7, a ring-shaped sealing material 17 is attached to the entire circumference of the end of the ring 16 and slidably contacts the inner surface 9a of the frame 9. This not only keeps the space between the ring 16 and the inner surface 9a of the frame 9 constant,
Since the sealing material 17 blocks the air flow before and after the diaphragm 13, it is considered that the above-mentioned problems are eliminated.

However, when the sealing material 17 slides on the inner surface 9a of the frame 9, there is a possibility that a sliding noise may be generated due to friction with the inner surface 9a of the frame 9, so that the sliding noise is suppressed. It is considered that the smoothness is enhanced and the generation of sliding noise is suppressed by applying a mirror surface treatment to the sliding surface that is the inner surface 9a of the frame 9, but conversely, the surface is sealed by applying a mirror surface treatment. Since the sliding contact portion between the material 17 and the sliding surface that is the inner surface 9a of the frame 9 is in a vacuum state, an adsorption phenomenon may occur, and the sliding operation of the sealing material 17 may not be performed smoothly. Cause deterioration,
There was a problem that it lacked reliability.

The present invention has been made in consideration of such circumstances, and an object thereof is to provide an edgeless speaker which can improve reliability.

[0011]

According to the first aspect of the present invention,
An edgeless speaker that is provided integrally with a diaphragm, has a sliding portion that seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. In addition, unevenness is formed on the sliding surface of the inner peripheral surface of the opening of the speaker frame or the sliding contact surface of the sliding portion.

According to a second aspect of the present invention, the diaphragm is provided integrally with the diaphragm, the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame are sealed, and the inner peripheral surface of the opening is slidable. An edgeless loudspeaker having a sliding portion formed as described above, in which unevenness is formed on a sliding surface of an inner peripheral surface of the opening of the speaker frame, and the surface roughness of the sliding surface is 25 s to
It is characterized by being set to 100 s.

According to a third aspect of the present invention, which is provided integrally with the diaphragm, seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless loudspeaker having a sliding portion formed as described above, wherein a plurality of grooves are formed on the sliding surface along a sliding direction of the sliding portion.

According to a fourth aspect of the present invention, which is provided integrally with the diaphragm, seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless speaker having a sliding portion formed as described above, wherein a plurality of grooves are formed on the sliding surface in a spiral shape in the sliding direction of the sliding portion.

The invention according to claim 5 is characterized in that a lubricant is applied to the sliding surface.

[0016]

In the edgeless speaker of the present invention, the unevenness is formed on the sliding surface of the inner peripheral surface of the opening of the speaker frame or the sliding contact surface of the sliding portion. Since a slight amount of air is circulated on the surface to the extent that it does not cause sound quality deterioration, it is possible to avoid the adsorption phenomenon that occurs when the sliding contact part between the sliding part and the sliding surface is in a vacuum state. The slidability of the part can be kept good.

Further, by setting the surface roughness of the sliding surface of the inner peripheral surface of the opening of the speaker frame to 25 s to 100 s, it is possible to avoid the adsorption phenomenon of the sliding contact portion between the sliding portion and the sliding surface. In addition, it is possible to prevent the generation of rubbing noise during sliding by the sliding portion.

Further, since a plurality of grooves are formed on the sliding surface of the inner peripheral surface of the opening of the speaker frame along the sliding direction of the sliding portion, when the sliding portion slides, the groove of the sliding surface causes the sound quality. Since a slight amount of air flow occurs that does not cause deterioration, it is possible not only to avoid the adsorption phenomenon of the sliding part, but also to reduce the frictional force when sliding the sliding part. Good slidability of the moving part can be maintained.

Furthermore, even when a plurality of grooves are formed in a spiral shape on the sliding surface in the sliding direction of the sliding portion,
Due to the groove, a slight amount of air flow is generated to the extent that sound quality is not deteriorated on the sliding surface, and it is possible to avoid an adsorption phenomenon that occurs when the sliding contact portion between the sliding portion and the sliding surface is in a vacuum state. Therefore, the slidability of the sliding portion can be kept good.

Further, since the lubricant is applied to the sliding surface, the lubricant is retained in the concave portion or groove of the sliding surface and uniformly held on the entire sliding surface. The frictional force between the sliding surface and the sliding surface is further reduced, and the slidability of the sliding portion can be further improved.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIG. 4 will be assigned the same reference numerals and overlapping explanations will be omitted.

[First Embodiment] FIGS. 1 and 2 show an embodiment of an edgeless speaker of the present invention. As shown in these drawings, a seal material 20 is attached to the end of the ring 16 as a deformable sliding portion made of an elastic body such as rubber or foam rubber or a fibrous porous member. The sealing material 20 is the diaphragm 13 or the ring 16.
And the inner surface 9a of the frame 9 are arranged so as to seal the entire space. As a result, the flow of air inside the frame 9 (in other words, inside and outside the cabinet) is restricted.

The sliding surface, which is the inner surface 9a of the frame 9 with which the sliding contact surface 21 of the seal member 20 is in sliding contact, is provided with a plurality of minute irregularities 30. In addition, the convex portions of these minute irregularities 30 are R-shaped, and the sliding contact surface 21 of the seal material 20 is formed.
Friction due to sliding contact with is reduced.

In such a structure, when the diaphragm 13 vibrates, the sliding contact surface 21 of the seal member 20 attached to the end of the ring 16 along with the vibration of the diaphragm 13 is the inner surface 9a of the frame 9. It moves while sliding on the sliding surface.

At this time, when the sliding contact surface 21 of the sealing material 20 comes into sliding contact with the sliding surface, a slight amount of air flow occurs to the extent that the sound quality is not deteriorated due to the unevenness 30, and the sliding contact surface of the sealing material 20. Since the suction phenomenon of the sealing material 20 that occurs when the sliding contact portion between the sliding surface 21 and the sliding surface is in a vacuum state is avoided,
The slidability of the sealing material 20 is kept good.

In this embodiment, the case where the unevenness 30 is provided on the sliding surface side of the inner surface 9a of the frame 9 has been described, but the present invention is not limited to this example, and the sliding contact surface 21 side of the sealing material 20 is provided. Concavities and convexities may be provided. In this case as well, since irregularities on the sliding contact surface 21 side of the sealing material 20 cause a slight flow of air to the extent that sound quality is not deteriorated, the sealing material 20 and The suction phenomenon of the sealing material 20 which occurs when the sliding contact portion with the sliding surface is in a vacuum state is avoided.

[Second Embodiment] In the second embodiment, the surface roughness of the sliding surface, which is the inner surface 9a of the frame 9 in FIG. 2, is the same as that of the Japanese Industrial Standard (JIS). 25s based on definition and indication (B 0601-1982)
It is 100s. The value of such surface roughness is
It is a value that avoids the adsorption phenomenon of the sealing material 20 that occurs when the sliding contact portion of the sealing material 20 with the sliding contact surface 21 is in a vacuum state, and does not generate a rubbing noise due to the sliding of the sealing material 20. It was obtained from.

That is, when the surface roughness is less than 25 s,
Between the sliding surface, which is the inner surface 9a of the frame 9, and the sliding contact surface 21 of the sealing material 20, a slight amount of air does not flow due to the unevenness 30 so that sound quality is not deteriorated.
The sliding contact portion between the sliding contact surface 21 and the sliding surface of the sealing material 20 may be in a state close to a vacuum state, and the sealing material 20 may be attracted.

On the other hand, when the surface roughness exceeds 100 s, the sliding surface which is the inner surface 9a of the frame 9 and the sealing material 20 are
Air flow occurs between the sliding contact surface 21 and
There is a possibility that sound quality may deteriorate due to generation of unnecessary wind noise.

Therefore, in this embodiment,
The surface roughness of the sliding surface, which is the inner surface 9a of the frame 9, is set to 25s.
Since the sliding contact portion between the sliding surface 30 that is the inner surface 9a of the frame 9 and the sliding contact surface 21 of the sealing material 20 is in a vacuum state by the setting of 100 s to 100 s, the adsorption phenomenon of the sealing material 20 can be avoided. The slidability of the sealing material 20 can be kept good, and the generation of rubbing noise due to the sliding of the sealing material 20 can be suppressed.

[Third Embodiment] FIGS. 3 and 4 show a third embodiment in which the shape of the unevenness 30 of the sliding surface which is the inner surface 9a of the frame 9 of FIG. 2 is changed. And
On the sliding surface, a plurality of grooves 32 are formed along the sliding direction of the sealing material 20 by minute irregularities 31. Further, the pitch P of the convex portions of the irregularities 31 is set to about 1 to 3 mm, the depth of these grooves 32 is set to 0.2 to 0.3 mm, and the convex portions of the irregularities 31 are the sliding contact surfaces of the sealing material 20. In order to reduce friction with 21, it has an R shape.

That is, if the depth of the groove 32 is less than 0.2 mm, the unevenness 31 between the sliding surface which is the inner surface 9a of the frame 9 and the sliding contact surface 21 of the sealing material 20 causes deterioration in sound quality. Since a slight amount of air does not flow to the extent that there is no such phenomenon, the sliding contact portion between the sliding contact surface 21 and the sliding surface of the sealing material 20 is in a state close to a vacuum state, and there is a possibility that the adsorption phenomenon of the sealing material 20 may occur. .

On the other hand, when the depth of the groove 32 exceeds 0.3 mm, air flow occurs between the sliding surface, which is the inner surface 9a of the frame 9, and the sliding contact surface 21 of the sealing material 20. As a result, there is a possibility that sound quality may deteriorate due to generation of unnecessary wind noise.

Therefore, in this embodiment,
Minute irregularities 3 along the sliding direction of the sealing material 20 on the sliding surface
Since the plurality of grooves 32 according to No. 1 are provided, not only friction during sliding of the sealing material 20 is reduced, but also between the sliding surface which is the inner surface 9a of the frame 9 and the sliding contact surface 21 of the sealing material 20. In addition, since a slight amount of air is circulated to the extent that the sound quality is not deteriorated by the plurality of grooves 32 formed by the unevenness 31, the sliding contact portion 21 of the sealing material 20 and the sliding contact portion are in a vacuum state. As a result, the phenomenon of adsorption of the sealing material 20 can be avoided, so that the slidability of the sealing material 20 can be kept good.

[Fourth Embodiment] In the fourth embodiment, the shapes of the plurality of grooves 32 provided on the sliding surface which is the inner surface 9a of the frame 9 in FIG. 4 are changed. As shown in FIG. 5, the groove 32 formed on the sliding surface has a spiral shape with respect to the sliding direction of the sealing material 20.

Here, in the spiral shape, the spiral groove (groove 32) does not make a plurality of turns between both ends of the inner surface 9a of the frame 9, but as shown in FIG.
About two laps are preferable. If the circumference is about 1/4 to 1/2, the sliding operation of the sealing material 20 is not hindered and a smooth sliding operation can be performed.

That is, even when the groove 32 of the sliding surface is formed in a spiral shape, the sliding contact between the sliding contact surface 21 of the sealing material 20 and the sliding surface is not so much that the sound quality is deteriorated. Since the air flows smoothly, it is possible to avoid an adsorption phenomenon that occurs when the sliding contact portion 21 of the sealing material 20 and the sliding surface are in a vacuum state, and the sliding property of the sliding portion is good. Can be kept at

[Fifth Embodiment] In the fifth embodiment, a lubricant such as wax, grease or oil is applied to the sliding surface which is the inner surface 9a of the frame 9 in each of the above-described embodiments. By further reducing the friction when the sliding contact surface 21 of the sealing material 20 slides on the sliding surface, the sealing material 2
The sliding property of 0 is further enhanced.

That is, when the sliding surface is flat, the lubricant applied to the sliding surface is pushed out of the sliding range by the sliding of the sealing material 20, and the lubricant on the sliding surface is removed. However, as described above, by making the sliding surface uneven, it can be retained inside the recess or groove 32, so that the lubricant can be uniformly held within the sliding range of the sealing material 20 on the sliding surface. Since the friction at the time of sliding is further reduced, the slidability of the sealing material 20 is further enhanced.

[0040]

As described above, according to the edgeless speaker of the present invention, the sliding portion is formed by forming the unevenness on the sliding surface of the inner peripheral surface of the opening of the speaker frame or the sliding contact surface of the sliding portion. When air is slid, a slight amount of air is circulated on the sliding surface or sliding contact surface so that sound quality is not deteriorated. The phenomenon can be avoided, and the slidability of the sliding portion can be kept good.

Further, by setting the surface roughness of the sliding surface of the inner peripheral surface of the opening of the speaker frame to 25 s to 100 s, it is possible to avoid the adsorption phenomenon of the sliding contact portion between the sliding portion and the sliding surface. In addition, it is possible to prevent the generation of rubbing noise during sliding by the sliding portion.

Further, since a plurality of grooves are formed on the sliding surface of the inner peripheral surface of the opening of the speaker frame along the sliding direction of the sliding portion, when the sliding portion slides, the groove of the sliding surface causes the sound quality. Since a slight amount of air flow occurs that does not cause deterioration, it is possible not only to avoid the adsorption phenomenon of the sliding part, but also to reduce the frictional force when sliding the sliding part. Good slidability of the moving part can be maintained.

Furthermore, even when a plurality of grooves are formed in a spiral shape on the sliding surface in the sliding direction of the sliding portion,
Due to the groove, a slight amount of air flow is generated to the extent that sound quality is not deteriorated on the sliding surface, and it is possible to avoid an adsorption phenomenon that occurs when the sliding contact portion between the sliding portion and the sliding surface is in a vacuum state. Therefore, the slidability of the sliding portion can be kept good.

Further, since the lubricant is applied to the sliding surface, the lubricant is retained in the recess or groove of the sliding surface and is evenly held on the entire sliding surface. The frictional force between the sliding surface and the sliding surface is further reduced, and the slidability of the sliding portion can be further improved.

Therefore, since the vibrating operation of the diaphragm is smoothly performed, the vibration amplitude of the diaphragm is sufficient and the performance deterioration is prevented, so that the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an edgeless speaker of the present invention.

FIG. 2 is a sectional view of a sliding surface showing an enlarged portion A of the frame of FIG.

FIG. 3 is a sectional view showing another embodiment in which the configuration of the sliding surface of FIG. 2 is changed.

4 is a cross-sectional view of the frame of FIG. 3 taken along the line BB.

5 is a perspective view showing another embodiment in which the shape of the groove on the sliding surface of the frame of FIG. 4 is changed.

FIG. 6 is a half-cut sectional view showing a conventional edgeless speaker.

7 is a half cross-sectional view for explaining a case where a sealing material is provided on the edgeless speaker of FIG.

[Explanation of symbols]

 9 frame 9a inner surface 13 diaphragm 16 ring 20 sealing material 21 sliding contact surface 30, 31 unevenness 32 groove

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[Procedure amendment]

[Submission date] October 30, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[First Embodiment] FIGS. 1 and 2 show an embodiment of an edgeless speaker of the present invention. As shown in these drawings, a seal material 20 is attached to the end of the ring 16 as a deformable sliding portion made of an elastic body such as rubber or foam rubber or a fibrous porous member. The sealing material 20 is the diaphragm 13 or the ring 16.
And the inner surface 9a of the frame 9 are arranged so as to seal the entire space. As a result, the flow of air inside the frame 9 (in other words, inside and outside the cabinet) is restricted. That is, the diaphragm 13 or the ring 16 here
The state in which the entire space (annular space) between the inner surface 9a and the inner surface 9a is hermetically sealed is such that an unnecessary wind noise or the like generated due to a pressure change inside the cabinet due to the vibration of the diaphragm 13 does not occur. It is a closed state that restricts the distribution of.

Front page continued (72) Inventor Takashi Oyaba 426-10 Hanazono, Tokorozawa, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant

Claims (5)

[Claims] 1. A sliding portion which is provided integrally with a diaphragm, seals between an outer peripheral side surface of the diaphragm and an inner peripheral surface of an opening of a speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless speaker having a concave and convex shape formed on a sliding surface of an inner peripheral surface of an opening of the speaker frame or a sliding contact surface of the sliding portion. 2. A sliding portion which is provided integrally with a diaphragm, seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless loudspeaker having: an unevenness is formed on a sliding surface of an inner peripheral surface of the opening of the speaker frame, and a surface roughness of the sliding surface is 25s to 10s.
An edgeless speaker characterized by being set to 0s. 3. A sliding portion which is provided integrally with the diaphragm, seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless speaker having a plurality of grooves formed on the sliding surface along a sliding direction of the sliding portion. 4. A sliding portion which is provided integrally with a diaphragm, seals between the outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of the speaker frame, and is slidable with respect to the inner peripheral surface of the opening. An edgeless speaker having a plurality of grooves formed in a spiral shape on the sliding surface in a sliding direction of the sliding portion. 5. The edgeless speaker according to claim 1, 2, 3 or 4, wherein a lubricant is applied to the sliding surface.