JPH09139997A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the speaker with a high conversion efficiency and with excellent input-resistance by selecting a size of an outer circumferential end face of a diaphragm adhered to a voice coil bobbin to be at least a half of an entire outer circumferential end face of the diaphragm or over. SOLUTION: A driving force exerting to a voice coil 7 acts on a diaphragm 1 via a bobbin 6 by selecting a size of an outer circumferential end face 5 of a diaphragm 1 formed thin and long adhered to the voice coil bobbin 6 to be at least a half of an entire outer circumferential end face of the diaphragm or over. A damper adhering rib 10 provided in the vicinity of both ends of the diaphragm 1 in the lengthwise direction and a damper 11 connecting to a lower side of the rib 10 and whose both ends are adhered to a frame 3 prevent rolling of the diaphragm 1 in the minor axis direction when the diaphragm 1 is vibrated vertically. Even when the diaphragm outer circumferential end 5 adhered to the voice coil bobbin 8 is not more than a 1/2 of the entire outer circumferential face, the prevention above is effective. The similar effect to design the aperture of the voice coil higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated speaker used for video / audio equipment and the like.

[0002]

2. Description of the Related Art A conventional elongated speaker will be described with reference to FIGS. FIG. 7 is a plan view, and FIG. 8 is a sectional view taken along the line AA of FIG. 7 in the minor axis direction.
In the figure, 14 is a cone-shaped diaphragm configured in a slim shape, 15 is an edge, 16 is a frame, 17 is a dust cap joined to the central portion of the cone-shaped diaphragm 14, 1
Reference numeral 9 denotes a damper having an external size that can be accommodated inside the frame 16. Further, 20 is a voice coil having a ring shape, 21 is a magnet, 22 is a ring-shaped magnetic gap in which the voice coil 20 having the ring shape is housed, and 23 and 24 are magnetic gaps 22. It's York.

The operation of the conventional speaker having a slender structure as described above will be described. When a driving current flows through the voice coil 20 having a ring shape, the voice coil 20 makes a piston movement, and the diaphragm 14 is moved. It vibrates in that direction.

As a result, the diaphragm 14 emits sound waves. FIG. 9 shows the sound pressure frequency characteristics of this speaker.

[0005]

However, the conventional speaker as described above has the following problems.
That is, since the driving method is such that the central portion of the cone-shaped diaphragm 14 having a slim shape is point-driven, split resonance in the major axis direction easily occurs.

As a result, peaks and dips occur in the frequency characteristics of reproduced sound pressure in the middle and high frequencies, resulting in deterioration of sound quality. For example, on the sound pressure frequency characteristic shown in FIG.
Significant dips are seen at z, 3 kHz and 5 kHz.

The width of the drive system including the yokes 23 and 24 for forming the magnetic gap 22 and the voice coil 20 is smaller than the length of the minor axis of the speaker.

Therefore, in such a speaker, it is physically impossible to increase the diameter of the voice coil 20, so that the line length of the voice coil 20 cannot be increased. Further, since the volume of the magnet 21 is limited to be small, the magnetic flux density of the magnetic gap 22 cannot be sufficiently secured.

As a result, the force coefficient (B × L) of the drive system becomes small and it is difficult to increase the conversion efficiency. Further, the damper 19 needs to have a small radius of curvature and a small width so as to be housed inside the frame 16.

Further, the stiffness of the vibration system becomes large, the minimum resonance frequency f ₀ rises, and it is difficult to reproduce the low frequency range.

Further, since it is impossible to make the diameter of the voice coil 20 large, there is a drawback that the input resistance of the speaker must be set low.

An object of the present invention is to solve the above problems.

[0013]

A speaker according to the present invention comprises a pair of ribs provided inside a slender bowl-shaped diaphragm having straight portions on two sides in the longitudinal direction and intersecting the longitudinal direction. In addition, the voice coil bobbin is joined to the substantially rectangular voice coil bobbin joining lower end face formed by the outer peripheral end face of the elongated bowl-shaped diaphragm and the lower end face of the rib, and is joined to the voice coil bobbin. The outer peripheral end surface of the diaphragm is made to be at least ½ or more of the entire outer peripheral end surface of the diaphragm. With this configuration, it is possible to improve the conversion efficiency, the bass range characteristics, and the input resistance. is there.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A loudspeaker of the present invention according to claim 1 of the present invention is an elongated bowl-shaped diaphragm provided with linear portions on two sides in the longitudinal direction, and is joined to an outer peripheral end surface of the diaphragm. The outer periphery is an elongated edge, an elongated frame for fixing the outer periphery of the edge, a pair of ribs provided inside the elongated bowl-shaped diaphragm in a direction intersecting the longitudinal direction,
The upper end surface is joined to the substantially rectangular voice coil bobbin joining lower end surface portion formed by the outer peripheral end surface of the elongated bowl-shaped diaphragm and the lower end surface of the rib, and the substantially rectangular shape around which the voice coil is wound. A voice coil bobbin and a magnetic circuit having a magnetic gap into which the voice coil wound around the substantially rectangular voice coil bobbin is inserted, the speaker comprising: The outer peripheral end face is made to be at least ½ or more of the entire outer peripheral end face of the diaphragm to improve the conversion efficiency, the bass range characteristic, and the input resistance.

According to a second aspect of the present invention, the speaker has an elongated bowl-shaped diaphragm having straight portions on two sides in the longitudinal direction, and an outer periphery joined to the outer peripheral end face of the diaphragm. An elongated edge, an elongated frame that secures the outer periphery of the edge, a pair of ribs provided inside the elongated bowl-shaped diaphragm in a direction intersecting the longitudinal direction, and an upper end surface of the elongated edge. While being joined to a substantially rectangular voice coil bobbin joining lower end surface portion formed by the outer peripheral end surface of the bowl-shaped diaphragm and the lower end surface of the rib, a substantially rectangular voice coil bobbin around which a voice coil is wound, A speaker comprising a magnetic circuit having a magnetic gap into which the voice coil wound around the substantially rectangular voice coil bobbin is inserted, the damper being provided near both ends of the diaphragm in the longitudinal direction. A joint rib and a damper connected to the lower end surface of the rib and joined to the frame are provided to improve the conversion efficiency, the bass range characteristic, the input resistance, and the vibration. It is also possible to prevent the rolling phenomenon in the direction perpendicular to the longitudinal direction (short direction) when the plate vibrates vertically.

According to a third aspect of the present invention, the speaker is provided with other ribs extending outward in the longitudinal direction from the rib of the first aspect or the rib for connecting the damper of the second aspect to the vicinity of both ends. Therefore, it is possible to expand the high limit frequency.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a plan view, and FIG. 2 is B of FIG.
FIG. 3B is a sectional view taken along line B, and FIG.

According to FIG. 1, 1 is a bowl-shaped diaphragm having a slim elongated shape and having a linear portion in the longitudinal direction, 2 is an elongated edge joined to the outer peripheral portion of the diaphragm 1, and 3 is It is an elongated frame in which the outer peripheral portion of the edge 2 is fixedly supported.

Reference numeral 4 denotes a voice coil bobbin joining rib provided on the inner wall of the diaphragm 1 in a direction intersecting with the longitudinal direction, 5 is a diaphragm outer peripheral end surface of the diaphragm 1, 6 is a substantially rectangular voice coil bobbin, 7 Is a voice coil wound around the lower end surface of the voice coil bobbin 6, and 8 is a voice coil bobbin joint in which an upper end surface of the voice coil bobbin 6 and a substantially rectangular shaped portion including the diaphragm outer peripheral end surface 5 and the voice coil bobbin joint rib 4 are adhered. In this joint portion 8, approximately ½ or more of the outer peripheral end surface 5 of the diaphragm 1 is joined to the upper end surface of the voice coil bobbin 6. Reference numeral 9 is a magnetic circuit into which the voice coil 7 is inserted, 10 is a rib for joining dampers provided near both ends of the diaphragm 1, and 11 is a damper.

The detailed configuration of the speaker of the present invention configured as described above will be described with reference to the drawings. At least a half or more of the end face 5 of the diaphragm outer peripheral end face 5 of the diaphragm 1 having an elongated shape is Since it is configured to be bonded to the voice coil bobbin 6, the driving force acting on the voice coil 7 acts on the diaphragm 1 via the voice coil bobbin 6.

In the above embodiment, as shown in FIG. 3, only the linear portion of the voice coil 7 wound around the voice coil bobbin 6 in the longitudinal direction is inserted into the magnetic gap of the magnetic circuit 9. It is not necessary to form the magnetic gap of the magnetic circuit 9 over the entire circumference of the voice coil 6, and by adopting this configuration, the structure of the yoke and the magnet forming the magnetic circuit 9 can be made extremely simple, which is not particularly shown. It is also possible to contribute to down and weight reduction.

Further, the damper joining rib 10 provided near both ends of the diaphragm 1 in the longitudinal direction, and the damper 11 connected to the lower end of the damper joining rib 10 and joined to the frame 3 at both ends thereof. The diaphragm 1 has an action of preventing rolling in the lateral direction of the diaphragm 1 when the diaphragm 1 vibrates up and down. This is because the diaphragm outer peripheral end surface 5 joined to the voice coil bobbin joint 8 is one of the entire outer peripheral end surfaces. The above-mentioned effects are exhibited even when the ratio does not become / 2.

Further, in the above embodiment, the outer peripheral edge 5 of the diaphragm is
It has been stated that ½ or more of all the outer peripheral ends of the above are bonded to the voice coil bobbin 6, but this may be appropriately selected to match or be close to the target frequency characteristic.

With the above structure, it is possible to provide a speaker which is capable of large amplitude and improved in input resistance even in a speaker having a slim shape.

Furthermore, the speaker drive section, that is, the magnetic circuit 9 and the voice coil 7 can be arranged most efficiently.

That is, since the driving force acting on the voice coil 7 can be transmitted to a half or more portion of the vibration plate (outer peripheral end surface 5), the vibration from the low frequency reproduction band to the high frequency reproduction band is generated. It is possible to obtain a vibration mode with less split resonance of a part, and obtain a flat sound pressure frequency characteristic from a low range to a high range.

(Embodiment 2) FIG. 4 is a sectional view showing the shape of a diaphragm, which is a main part, and FIG. 5 is a plan view showing the back surface of FIG. Explaining only the difference, the reference numeral 13 denotes a high frequency division resonance control rib provided on the back surface of the diaphragm 1 from the both outer ends of the voice coil bobbin joining rib 4 to the vicinity of both ends of the diaphragm 1.

As a result, in the diaphragm 1, the rigidity of the portion of the diaphragm outer peripheral end surface 5 where the driving force does not work (outside the joint between the voice coil bobbin 6 and the diaphragm 1) is increased, and the high frequency characteristics are improved. This is to expand the high frequency reproduction limit of the speaker by partially utilizing the divided resonance of the diaphragm 1 in the high frequency region so as to extend it, and the height, thickness and the like are set appropriately.

FIG. 6 shows a sound pressure frequency characteristic (a) in (Embodiment 1) and a sound pressure frequency characteristic (b) in (Embodiment 2) in which the upper limit frequency is expanded.

[0030]

As described above, according to the present invention, in the slender speaker, the line length of the voice coil can be set long, and the same effect as that of setting the voice coil diameter large can be obtained. Therefore, the drive system force coefficient (B
XL) can be set to a large value, and a speaker with high conversion efficiency and significantly improved input resistance can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view of a speaker according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a perspective view of a vibrating member that is a main part of the same.

FIG. 4 is a cross-sectional view of a diaphragm that is a main part of another embodiment.

FIG. 5 is a plan view of the same back surface.

FIG. 6 is a sound pressure frequency characteristic diagram of the speaker of the present invention.

FIG. 7 is a plan view of a conventional speaker having an elongated structure.

FIG. 8 is a sectional view of the same minor axis direction.

[Fig. 9] Same sound pressure frequency characteristic diagram

[Explanation of symbols]

 1 Vibration Plate 2 Edge 3 Frame 4 Voice Coil Bobbin Joining Rib 5 Vibration Plate Outer End Face 6 Voice Coil Bobbin 7 Voice Coil 8 Voice Coil Bobbin Joining 9 Magnetic Circuit 10 Damper Joining Rib 11 Damper 13 High Frequency Division Resonance Control Rib

Claims (3)

[Claims] 1. An elongated bowl-shaped diaphragm having straight portions on two sides in the longitudinal direction, an edge having an elongated outer periphery joined to an outer peripheral end face of the diaphragm, and an outer periphery of this edge fixed to each other. An elongated frame, a pair of ribs provided inside the elongated bowl-shaped diaphragm in a direction intersecting the longitudinal direction, and an upper end surface of the elongated bowl-shaped diaphragm and an outer peripheral end surface of the diaphragm. A substantially rectangular voice coil bobbin, which is joined to the substantially rectangular voice coil bobbin joining lower end surface portion formed by the lower end surface of the voice coil, and a voice coil wound around the substantially rectangular voice coil bobbin. A magnetic circuit having a magnetic gap into which the voice coil is inserted, and the outer peripheral end surface of the diaphragm joined to the voice coil bobbin is at least ½ or more of the entire outer peripheral end surface of the diaphragm. Speaker. 2. An elongated bowl-shaped diaphragm having straight portions on two sides in the longitudinal direction, an edge having an elongated outer periphery joined to an outer peripheral end face of the diaphragm, and an outer periphery of this edge fixed to each other. An elongated frame, a pair of ribs provided inside the elongated bowl-shaped diaphragm in a direction intersecting the longitudinal direction, and an upper end surface of the elongated bowl-shaped diaphragm and an outer peripheral end surface of the diaphragm. A substantially rectangular voice coil bobbin, which is joined to the substantially rectangular voice coil bobbin joining lower end surface portion formed by the lower end surface of the voice coil, and a voice coil wound around the substantially rectangular voice coil bobbin. A magnetic circuit having a magnetic gap into which the voice coil is inserted, the damper connecting ribs being provided in the vicinity of both longitudinal ends of the diaphragm, and the ribs connected to the lower end surface of the rib and A speaker with a damper joined to the ram. 3. The speaker according to claim 1 or 2, wherein other ribs are provided outwardly in the longitudinal direction from the ribs or the damper joining ribs to the vicinity of both ends.