JP2012044517A - Speaker frame and speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing or a frame of an acoustic unit to which a speaker is attached or a speaker frame in which connection strength of legs and strength of the whole legs are secured without affecting other peripheral members and a diaphragm and air resistance of a back side of the diaphragm can be reduced.SOLUTION: A speaker frame 50 includes: an inner circular portion 60 to which a magnetic circuit portion is attached, an outer circular portion 70 which has a larger diameter than the inner circular portion 60 and to which an edge of the diaphragm is attached; and a plurality of legs 80 coupling the inner circular portion 60 to the outer circular portion 70. The leg 80 has a narrow portion 83 whose width is narrower than an end portion 81 on the inner circular portion side and an end portion 82 on the outer circular portion side between the end portion 81 on the inner circular portion side and the end portion 82 on the outer circular portion side. Thickness of the narrow portion 83 is made thicker than the end portion 81 on the inner circular portion side and the end portion 82 on the outer circular portion side.

Description

  The present invention relates to a speaker frame and a speaker.

As a loudspeaker used for in-vehicle or household audio equipment, a dynamic loudspeaker having a cone-shaped diaphragm is widely used. A conventional speaker structure of this type will be described with reference to FIGS. 4A to 4D.
4A is a side view of the speaker, FIG. 4B is a sectional view of the speaker, FIG. 4C is a front view of the speaker frame, and FIG. 4D is a rear view of the speaker frame.
In this specification, the side from which the sound of the speaker is emitted (the upper side in FIG. 4A and FIG. 4B) is defined as “front side”, and the opposite side (the lower side in FIG. 4A and FIG. 4B) is defined as “rear side”. To do.

  The speaker 2 shown in FIGS. 4A and 4B is connected to the magnetic circuit unit 310, the voice coil 320 inserted into the gap in the magnetic circuit unit 310, the voice coil bobbin 321 that holds the voice coil 320, and the voice coil bobbin 321. And a cone-shaped diaphragm 330 and a bowl-shaped speaker frame 350 for holding them.

  The magnetic circuit unit 310 includes an annular permanent magnet 310A, a yoke 310B partially fitted in the permanent magnet 310A, and an annular plate 310C disposed on the front surface of the permanent magnet 310A.

  The magnetic circuit unit 310 is fixed to the speaker frame 350. On the other hand, since the voice coil 320 and the diaphragm 330 need to vibrate, the voice coil 320 is connected to the speaker frame 350 via the damper 340 and the diaphragm 330 is connected to the speaker frame 350 via the edge 330E made of a flexible film. Is retained.

The speaker frame 350 is
An annular bottom magnetic circuit portion mounting portion 361, a side portion 362 projecting forward on the outer periphery of the magnetic circuit portion mounting portion 361, and a front end of the side portion 362 extending radially outward. An inner annular portion 360 having an annular damper mounting portion 363;
An outer annular portion 370 having a larger diameter than the inner annular portion 360 and to which the edge 330E of the diaphragm 330 is attached;
It comprises a plurality of legs 380 that connect the inner annular portion 360 and the outer annular portion 370.

A plurality of mounting holes 351 for fixing the speaker 2 to a housing or a frame of an audio device are provided on the back side of the outer annular portion 370 of the speaker frame 350.
Between the inner annular portion 360 and the outer annular portion 370, a terminal attachment portion 352 for attaching a terminal of the speaker 2 is provided.
In the example shown in the figure, seven leg portions 380 and terminal attachment portions 352 are radially provided at equal intervals, and a total of eight openings are provided between these seven leg portions 380 and terminal attachment portions 352. 353 is formed.

  As the speaker frame 350, a die frame in which an inner annular portion 360, an outer annular portion 370 and a plurality of leg portions 380 are integrally formed, such as a die casting frame by a metal casting method or a resin frame by plastic injection molding, is generally used. Yes.

The plurality of leg portions 380 are on the grounding surface side for attachment to the audio equipment and do not block the back side of the outer annular portion 370 in which the attachment holes 351 are formed, and the housing or frame of the audio equipment to which the speaker 2 is attached, or Since it does not contact other peripheral members and is sufficiently separated from the diaphragm 330, particularly its edge 330E, and does not affect the vibration of the diaphragm 330, its thickness is limited.
The plurality of legs 380 also needs to have sufficient connection strength between the inner annular portion 360 and the outer annular portion 370 and sufficient strength to support the heavy magnetic circuit portion 310.

  In order to ensure the connection strength between the inner annular portion 360 and the outer annular portion 370 and the strength of the entire leg portion 380, while the thickness is limited, conventionally, the plurality of leg portions 380 in the molded frame have been It has a substantially uniform thickness from the annular portion 360 to the outer annular portion 370, and has a plate-like shape that is generally wider than the thickness (see FIGS. 4B and 4D). In the plurality of legs 380, the end 381 on the inner annular portion 360 side and the end 382 on the outer annular portion 370 side are slightly wider than the other portions 383, and the width of the portion 383 excluding these both ends is substantially the same. The width of the portion 383 excluding both ends is made larger than the thickness (see FIG. 4D).

  In the speaker frame 350, “thickness of the leg portion 380” is a separation distance (= radial size) between the diaphragm facing surface of the leg portion 380 and the back surface of the leg portion, and “width of the leg portion 380” is the leg portion. 380 is a distance (= size in the circumferential direction) between a pair of side surfaces formed between the diaphragm facing surface and the back surface of 380.

  In the loudspeaker, along with the vibration in the front-rear direction of the diaphragm, air enters and exits in a plurality of openings of the speaker frame in the same direction as the vibration direction of the diaphragm. If there are a plurality of plate-like legs that are wider than the thickness in the direction (circumferential direction) that intersects the direction of air movement, the air resistance increases and hinders the smooth movement of air on the back side of the diaphragm. There is a fear. This hinders the accurate amplitude of the diaphragm and may deteriorate the frequency characteristics of the speaker output.

Patent Document 1 describes a speaker frame (1) in which each leg portion is configured by a pair of columnar bodies (6) having a substantially uniform thickness as a whole and having a width smaller than the thickness (see FIG. 1 (a) to (c)). In such a configuration, since the opening is formed between the pair of columnar bodies (6), the aperture ratio can be improved.
In the configuration of Patent Document 1, the width of each columnar body (6) is smaller than the thickness, so that the columnar body (6) is generally thicker in order to ensure the connection strength of the legs and the strength of the entire legs. Designed.

In the speaker frame described in Patent Document 2, a leg portion (1b) including a plate-like portion facing the diaphragm and reinforcing ribs protruding on the back side along both side surfaces thereof is used. (FIG. 2).
In the speaker frame described in Patent Document 2, a rib (1ae) is provided standing from the outer periphery of the upper surface of the damper mounting portion (1ad), and a region (E4) where the leg portion (1b) of the rib (1ae) is coupled. Is higher than other regions (FIG. 7).
In paragraph 0056 of Patent Document 2, it is described that the rib (1ae) can be formed with less material than the comparative example without reducing the strength of the joint portion between the rib (1ae) and the leg (1b). ing.

JP 2002-142290 A JP 2006-229518

As described in Patent Document 1, when the entire leg portion is uniformly thickened, the leg portion has a structure in which the thickness is increased on the back side or the diaphragm side or both than the conventional structure.
When the thickness of the entire leg portion is increased on the back side, there is a risk of contact with the housing or frame of the audio equipment to which the speaker is attached or other peripheral members. If the specifications of the audio equipment or other peripheral members to which the speakers are attached are determined, these design changes cannot be made. Further, even if the design of the audio device to which the speaker is attached or other peripheral members can be changed, it is not preferable because of high costs and an increase in the size of the entire audio device.
When the thickness of the entire leg is increased to the diaphragm side, the leg part is too close to the diaphragm, especially its edge, and the vibration stroke of the diaphragm is limited, so that a large volume can be reproduced well. Loss of sound quality will be caused.

  In Patent Document 2, the width and thickness of the leg portion (1b) (= height of the reinforcing rib) are substantially uniform as a whole, and no effort has been made to increase the aperture ratio. No measures are taken to reduce this.

  The present invention has been made in view of the above circumstances, and the connection strength of the leg portion and the entire leg portion without affecting the housing or frame of the audio equipment to which the speaker is attached, other peripheral members, and the diaphragm. It is an object of the present invention to provide a speaker frame capable of reducing the air resistance on the back side of the diaphragm and a speaker including the speaker frame.

The speaker frame of the present invention is
A speaker frame used for a speaker comprising a magnetic circuit unit, a voice coil inserted into a gap in the magnetic circuit unit, a voice coil bobbin holding the voice coil, and a diaphragm connected to the voice coil bobbin. And
An inner annular part to which the magnetic circuit part is attached;
An outer annular portion having a larger diameter than the inner annular portion, to which an edge of the diaphragm is attached;
A plurality of legs connecting the inner annular portion and the outer annular portion;
The leg portion is narrower than the end portion on the inner annular portion side and the end portion on the outer annular portion side between the end portion on the inner annular portion side and the end portion on the outer annular portion side. It has a narrow portion, and the thickness of the narrow portion is thicker than the end portion on the inner annular portion side and the end portion on the outer annular portion side.

  In this specification, “the thickness of the leg portion” is a size in the radial direction (in FIG. 1B, a size in a direction normal to the back surface 80B from the back surface 80B of the leg portion toward the diaphragm facing surface 80A). “Part width” is the size in the circumferential direction.

In the speaker frame of the present invention,
The narrow portion is continuously widened from the inner annular portion side toward the outer annular portion side after the width is continuously narrowed, and from the inner annular portion side to the outer annular portion side. Therefore, it is preferable to have a continuous shape changing portion that becomes continuously thinner after the thickness is continuously increased.

In the speaker frame of the present invention,
The narrow portion may have a structure in which the thickness is increased on the diaphragm side or a structure in which the thickness is increased on the back side of the speaker.
In this specification, “a structure with an increased thickness on the diaphragm side or a structure with an increased thickness on the back side of the speaker” means that the diaphragm facing surface and the back surface of the leg portion are connected from the connecting portion of the inner annular portion. Compared to the “structure in which the entire leg portion is made to have a uniform thickness” formed in a plane parallel with a uniform thickness up to the connection part with the outer ring part, a structure with an increased thickness on the diaphragm side or on the back side of the speaker It means a structure with increased thickness.

  As the aspect of the leg portion, a diaphragm facing surface facing the diaphragm, a back surface facing the diaphragm facing surface, a pair of side surfaces formed between the diaphragm facing surface and the back surface, Are provided.

Another aspect of the leg portion includes a plate-like portion that faces the diaphragm, and a pair of ribs that protrude in the same direction on both side surfaces of the plate-like portion.
In such an embodiment, the “leg thickness” is the rib height.

The speaker of the present invention is
A speaker comprising: a magnetic circuit unit; a voice coil inserted into a gap in the magnetic circuit unit; a voice coil bobbin that holds the voice coil; a diaphragm connected to the voice coil bobbin; and a speaker frame. ,
The speaker frame is
An inner annular part to which the magnetic circuit part is attached;
An outer annular portion having a larger diameter than the inner annular portion, to which an edge of the diaphragm is attached;
A plurality of legs connecting the inner annular portion and the outer annular portion;
The leg portion is narrower than the end portion on the inner annular portion side and the end portion on the outer annular portion side between the end portion on the inner annular portion side and the end portion on the outer annular portion side. It has a narrow portion, and the thickness of the narrow portion is thicker than the end portion on the inner annular portion side and the end portion on the outer annular portion side.

  According to the present invention, the connection strength of the leg portion and the strength of the entire leg portion are ensured without affecting the housing or frame of the audio equipment to which the speaker is attached, or other peripheral members, and the vibration plate. It is possible to provide a speaker frame capable of reducing the air resistance on the back side of the speaker and a speaker including the speaker frame.

It is a side view of the speaker of a 1st embodiment. It is sectional drawing of the speaker of 1st Embodiment. It is a front view of the speaker frame of 1st Embodiment. It is a rear view of the speaker frame of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is sectional drawing which shows the example of a design change of 1st Embodiment. It is a perspective view of the back side of the speaker frame of 2nd Embodiment. It is the elements on larger scale of FIG. 2A. It is a rear view of the speaker frame of 2nd Embodiment. It is a perspective view of the front side of the speaker frame of 3rd Embodiment. It is the elements on larger scale of FIG. 3A. It is a rear view of the speaker frame of 3rd Embodiment. It is a side view of the conventional speaker. It is sectional drawing of the conventional speaker. It is a front view of the conventional speaker frame. It is a rear view of the conventional speaker frame.

“First Embodiment”
With reference to the drawings, a speaker frame according to a first embodiment of the present invention and a structure of a speaker including the same will be described.
The speaker of the present embodiment is used for an on-vehicle or home acoustic device. The speaker of this embodiment is a dynamic speaker provided with a cone-shaped diaphragm.
1A is a side view of the entire speaker, FIG. 1B is a sectional view of the entire speaker, FIG. 1C is a front view of the speaker frame, and FIG. 1D is a rear view of the speaker frame.

  A speaker 1 of this embodiment shown in FIGS. 1A and 1B includes a magnetic circuit unit 10, a voice coil 20 inserted into a gap in the magnetic circuit unit 10, a voice coil bobbin 21 that holds the voice coil 20, and a voice coil bobbin. The cone-shaped diaphragm 30 connected to 21 and a bowl-shaped speaker frame 50 for holding them are provided.

  The magnetic circuit unit 10 includes an annular permanent magnet 10A, a yoke 10B partially fitted in the permanent magnet 10A, and an annular plate 10C disposed on the front surface of the permanent magnet 10A.

  The magnetic circuit unit 10 is fixed to the speaker frame 50. In contrast, since the voice coil 20 and the diaphragm 30 need to vibrate, the voice coil 20 is connected to the speaker frame 50 via the damper 40 and the diaphragm 30 is connected to the speaker frame 50 via the edge 30E made of a flexible film. Is retained.

The voice coil 20 is held by the voice coil bobbin 21, and the voice coil bobbin 21 is held by the speaker frame 50 via the damper 40 so that the voice coil 20 is positioned in the gap of the magnetic circuit unit 10.
The front end of the voice coil bobbin 21 is connected to the inner periphery of the diaphragm 30, and the outer periphery of the diaphragm 30 is held by the speaker frame 50 via the edge 30 </ b> E.

  The voice coil bobbin 21 is a cylinder made of paper or plastic, and the voice coil 20 is a conductive wire wound around it. When a voice signal flows through the conducting wire forming the voice coil 20, the voice coil bobbin 21 vibrates in the front-rear direction according to the waveform of the voice signal according to the Fleming left-hand rule. Since the diaphragm 30 is connected to the voice coil bobbin 21, when the diaphragm 30 vibrates together with the voice coil bobbin 21, sound corresponding to the waveform of the audio signal is radiated into the air.

The speaker frame 50
An annular bottom magnetic circuit portion mounting portion 61, a side portion 62 projecting forward on the outer periphery of the magnetic circuit portion mounting portion 61, and a radially outer side extending from the front end of the side portion 62. An inner annular portion 60 including an annular damper mounting portion 63;
An outer annular portion 70 having a larger diameter than the inner annular portion 60 and to which the edge 30E of the diaphragm 30 is attached;
It is comprised from the some leg part 80 which connects the inner annular part 60 and the outer annular part 70. As shown in FIG.

The leg 80 has a rear side end connected to the inner annular portion 60 and a front side end connected to the outer annular portion 70. A plurality of leg portions 80 extend radially from the outer peripheral portion of the inner annular portion 60 toward the oblique front.
The leg 80 includes a diaphragm facing surface 80A facing the diaphragm 30, a back surface 80B facing the diaphragm facing surface 80A, and a pair of side surfaces 80C formed between the diaphragm facing surface 80A and the back surface 80B. It has.

A plurality of attachment holes 51 for fixing the speaker 1 to a housing or a frame of an audio device are provided on the back side of the outer annular portion 70 of the speaker frame 50.
Between the inner annular portion 60 and the outer annular portion 70, a terminal attachment portion 52 for attaching the terminal of the speaker 1 is provided.

  In the present embodiment, the seven leg portions 80 and the terminal attachment portions 52 are radially provided at equal intervals, and a total of eight openings are provided between the seven leg portions 80 and the terminal attachment portions 52. 53 is formed.

  The speaker frame 50 of this embodiment is a die-cast frame made of an aluminum alloy or magnesium alloy in which an inner annular portion 60, an outer annular portion 70, and a plurality of leg portions 80 are integrally molded by a metal casting method, or plastic injection molding. Thus, a molded frame such as a resin frame in which the inner annular portion 60, the outer annular portion 70, and the plurality of leg portions 80 are integrally molded.

As the diaphragm 30 vibrates in the front-rear direction, air enters and exits the plurality of openings 53 of the speaker frame 50 in the same direction as the vibration direction of the diaphragm 30. If the air does not enter and exit smoothly, the accurate amplitude of the diaphragm 30 is hindered, and the frequency characteristics of the speaker output may be deteriorated.
In order to smoothly enter and exit the air, it is preferable to increase the aperture ratio of the speaker frame 50 (the opening area of the opening 53) as much as possible. A larger opening ratio of the speaker frame 50 is preferable because air resistance is reduced.

In order to increase the aperture ratio of the speaker frame 50, the width (= size in the circumferential direction) of the plurality of legs 80 may be reduced, but the plurality of legs 80 includes the inner annular portion 60 and the outer annular portion 70. It is necessary to have sufficient connection strength between them and sufficient strength to support the heavy magnetic circuit unit 10.
Further, the plurality of leg portions 80 do not block the attachment hole 51, do not contact the housing or frame of the audio equipment to which the speaker 1 is attached, or other peripheral members, and are sufficiently separated from the diaphragm 30, particularly the edge 30E. Therefore, it is necessary to design so as not to affect the vibration of the diaphragm 30.
In the present embodiment, the leg portion 80 is designed as follows in order to satisfy all the required characteristics.

As shown in FIG. 1A to FIG. 1D, the leg portion 80 has a narrow portion 83 narrower than the end portion 81 between the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side. Have.
As shown in the enlarged view in FIG. 1D, when the width of the end portion 81 on the inner annular portion side is W1, the width of the end portion 82 on the outer annular portion side is W2, and the minimum width of the narrow portion 83 is W3, W3 <W1 and W3 <W2.
In the leg portion 80, the narrow portion 83 is thicker than the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side.
As shown in the enlarged view in FIG. 1B, when the thickness of the end portion 81 on the inner annular portion side is T1, the thickness of the end portion 82 on the outer annular portion side is T2, and the maximum thickness of the narrow portion 83 is T3, T3 > T1 and T3> T2.
As shown from a comparison between FIG. 1B of the present embodiment and FIG. 4B of the conventional structure, in the present embodiment, the narrow portion 83 of the leg portion 80 is more than the structure in which the entire leg portion 80 has a uniform thickness. The thickness is increased on the diaphragm 30 side.

  In the present embodiment, the “thickness of the leg portion 80” is a separation distance (= radial size) between the diaphragm facing surface 80A of the leg portion 80 and the back surface 80B of the leg portion 80, and “the width of the leg portion 80”. Is a separation distance (= size in the circumferential direction) of a pair of side surfaces 80C formed between the diaphragm facing surface 80A and the back surface 80B of the leg 80.

  In the present embodiment, the narrow portion 83 is widened continuously from the inner annular portion 60 side toward the outer annular portion side 70 after the width is continuously narrowed, and the narrow portion 83 is removed from the inner annular portion 60 side. It is a continuous shape change part which becomes thin continuously after it becomes thick toward the annular part 70 side continuously.

  As shown in FIGS. 1A and 1D, in the leg portion 80, chamfering is performed on the corner portions of the connecting portion with the inner annular portion 60 and the connecting portion with the outer annular portion 70.

  In this embodiment, a narrow portion 83 having a narrower width than these ends is provided between the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side so that the width of the central portion is the smallest. ing. The narrow portion 83 is thicker than the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side.

As is apparent from a comparison between FIGS. 1C and 1D of the present embodiment and FIGS. 4C and 4D of the conventional structure, the opening area of the opening 53 is reduced by reducing the width of the central portion of the leg portion 80 and the vicinity thereof. Has been expanded.
When the width of the connecting portion with the inner annular portion 60 and the connecting portion with the outer annular portion 70 is reduced, the connection strength between the leg portion 80 and the inner annular portion 60 and the outer annular portion 70 is lowered, which is not preferable. . Further, even if only the width of the connection portion between the inner annular portion 60 or the vicinity thereof and the connection portion between the outer annular portion 70 or the vicinity thereof is reduced, it does not contribute much to the increase in the opening area of the opening 53.
In this embodiment, the width of the connecting portion with the inner annular portion 60 and the connecting portion with the outer annular portion 70 is wide as in the conventional case, and the connection strength between the leg portion 80 and the inner annular portion 60 and the outer annular portion 70 is increased. Is secured.

  Further, simply providing the narrow portion 83 having a narrower width than the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side reduces the strength of the narrow portion 83. There is a risk of doing. In the present embodiment, the thickness of the narrow portion 83 is increased to ensure the strength of the narrow portion 83.

  When the thickness of the entire leg portion 80 is increased, the leg portion 80 comes into contact with the housing or frame of the audio equipment to which the speaker 1 is attached, or other peripheral members, or is too close to the edge 30E of the vibration plate 30. 30 vibration may be affected. In the present embodiment, the thickness of the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side is the same as that of the prior art, and the thickness is only partially increased between them, so there is no such concern. .

  In the present embodiment, the narrow portion 83 of the leg portion 80 has a structure in which the thickness is increased on the diaphragm 30 side as compared with a structure in which the entire leg portion 80 has a uniform thickness. There is no risk of contact with the housing or frame of the audio equipment to which the is attached, or other peripheral members. In addition, if it is between the end portion 81 on the inner annular portion side and the end portion 82 on the outer annular portion side, a sufficient distance from the diaphragm 30 can be obtained even if the thickness of the narrow portion 83 is increased inward. There is no influence on the diaphragm 30 (see FIG. 1B).

  If it is within the range that does not affect the housing or frame of the audio equipment to which the speaker 1 is attached, or other peripheral members, the back side of the narrow portion 83 rather than the structure in which the entire leg portion 80 has a uniform thickness. Further, a structure in which the thickness is increased on both the vibration plate 30 side and the back surface side may be used as compared with a structure in which the thickness is further increased, or a structure in which the entire leg portion 80 is uniform in thickness.

Examples of the thickness change of the leg 80 are shown in FIGS. 1E to 1J.
FIG. 1E is an example of a shape in which a convex portion TB is provided on the diaphragm 30 side of the narrow portion 83 and the narrow portion 83 is increased in thickness only on the diaphragm 30 side.
FIG. 1F is an example of a shape in which a convex portion TB is provided on the back side of the narrow portion 83 and the narrow portion 83 is increased in thickness only on the back side.
FIG. 1G is an example of a shape in which convex portions TB are provided on both the diaphragm 30 side and the back surface side of the narrow portion 83 and the thickness is increased on both the diaphragm 30 side and the back surface side.
In FIG. 1H, a convex portion TB is provided on the diaphragm 30 side of the narrow portion 83, and a shallow concave portion UB (having a depth smaller than the height of the convex portion TB) is provided on the back side. Is an example of a shape with increased thickness on the diaphragm 30 side.
In FIG. 1I, a convex portion TB is provided on the back side of the narrow portion 83, and a shallow concave portion UB (having a depth smaller than the height of the convex portion TB) is provided on the diaphragm 30 side. Is an example of a shape with increased thickness on the diaphragm 30 side.

In the narrow portion 83, a plurality of convex portions TB may be provided on the same surface side, and similarly, a plurality of concave portions UB may be provided on the same surface side.
FIG. 1J is an example of a thickness change in which two convex portions TB are provided on the diaphragm 30 side and the back surface side of the narrow portion 83, respectively. In this example, the two convex portions TB on the diaphragm 30 side and the two convex portions TB on the back surface face each other. In this example, narrow portions 83 are provided at two locations.
However, it is preferable that the number of the convex portions TB provided on the same surface side is one, and it is preferable that the number of the concave portions UB provided on the same surface side is also one.

  The leg portion 80 is actually formed in a cross-sectional arc shape from the inner annular portion 60 side to the outer annular portion 70 side, but is simplified in FIGS. 1E to 1J and both end portions of the leg portion 80 are the same surface. It is illustrated as above, and only the change in thickness is easily visible.

As described above, in this embodiment, the opening area of the opening 53 is increased while ensuring the connection strength between the leg 80 and the inner annular portion 60 and the outer annular portion 70 and the strength of the entire leg 80. ing.
The width of the narrow portion 83 is reduced as much as possible to increase the opening area of the opening portion 53, and the strength of the entire leg portion 80 can be secured, and the housing or frame of the audio equipment to which the speaker 1 is attached, or other peripheral members In addition, it is preferable to make the width of the narrow portion 83 as thick as possible within a range that does not affect the diaphragm 30.
Specifically, the leg portion 80 preferably has a minimum width <maximum thickness.

As described above, according to the present embodiment, the connection strength and leg of the leg portion 80 are not affected without affecting the housing or frame of the audio device to which the speaker 1 is attached or other peripheral members and the diaphragm 30. The strength of the entire unit 80 is ensured, and the speaker frame 50 that can reduce the air resistance on the back side of the diaphragm 30 and the speaker 1 including the speaker frame 50 can be provided.
In the speaker 1 of the present embodiment, the air resistance on the back side of the diaphragm 30 is reduced, so that the sound quality is improved as compared with the conventional one.

“Second Embodiment”
A speaker frame according to a second embodiment of the present invention will be described with reference to the drawings.
2A is an overall perspective view of the rear side of the speaker frame, FIG. 2B is a partially enlarged view of FIG. 2A, and FIG. 2C is a rear view of the speaker frame.
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The overall structure of the speaker is the same as in the first embodiment.
The speaker frame 150 of the present embodiment is similar to the first embodiment,
An annular bottom magnetic circuit portion mounting portion 161, a side portion 162 projecting forward on the outer periphery of the magnetic circuit portion mounting portion 161, and a radially outer side extending from the front end of the side portion 162. An inner annular portion 160 including an annular damper mounting portion 163;
An outer annular portion 170 having a larger diameter than the inner annular portion 160 and to which the edge 30E of the diaphragm 30 is attached;
A plurality of leg portions 180 are provided between the inner annular portion 160 and the outer annular portion 170.

  Also in this embodiment, the leg part 180 has a rear side end connected to the inner annular part 160 and a front side end connected to the outer annular part 170. A plurality of leg portions 180 extend radially from the outer peripheral portion of the inner annular portion 160 toward obliquely forward.

In the present embodiment, the leg portion 180 includes a plate-like portion 180A that faces the diaphragm 30, and a pair of ribs 180B that protrude in the same direction on both side surfaces of the plate-like portion 180A.
In the present embodiment, the plate-like portion 180A is disposed on the vibration plate 30 side, and a pair of ribs 180B protrude from the plate-like portion 180A on the back side. The plate-like portion 180A may be disposed on the back side, and the pair of ribs 180B may be provided so as to protrude from the plate-like portion 180A to the diaphragm 30 side.

  Also in this embodiment, a terminal attachment portion 152 for attaching a speaker terminal is provided between the inner annular portion 160 and the outer annular portion 170.

  In the present embodiment, four leg portions 180 are radially provided at equal intervals, and a total of four openings 153 are formed between the four leg portions 180.

  As in the first embodiment, the speaker frame 150 according to the present embodiment is a die-cast frame in which the inner annular portion 160, the outer annular portion 170, and the plurality of leg portions 180 are integrally molded by a metal casting method, or plastic injection molding. This is a molded frame such as a resin frame in which an inner annular portion 160, an outer annular portion 170, and a plurality of leg portions 180 are integrally molded.

  The leg portion 180 includes a plate-like portion 180A that faces the diaphragm 30, and a pair of ribs 180B that protrude from both side surfaces of the plate-like portion 180A. The fluidity of the metal can be improved to improve the moldability, and the speaker frame 150 can be reduced in weight.

In the speaker including the speaker frame 150 of the present embodiment, air enters and exits the plurality of openings 153 of the speaker frame 150 as the diaphragm 30 vibrates in the front-rear direction. If the air does not enter and exit smoothly, the accurate amplitude of the diaphragm 30 is hindered, and the frequency characteristics of the speaker output may be deteriorated.
In order to smoothly enter and exit the air, it is preferable to increase the aperture ratio (opening area of the opening) of the speaker frame 150 as much as possible. A larger opening ratio of the speaker frame 150 is preferable because air resistance is reduced.
In order to increase the aperture ratio of the speaker frame 150, it is only necessary to reduce the width (= size in the circumferential direction) of the plurality of legs 180, but the plurality of legs 180 includes the inner annular portion 160 and the outer annular portion 170. It is necessary to have sufficient connection strength between them and sufficient strength to support the heavy magnetic circuit unit 10.
Further, the plurality of legs 180 do not contact the housing or frame of the audio equipment to which the speakers are attached, or other peripheral members, and are sufficiently separated from the diaphragm 30, particularly the edge 30E, to affect the vibration of the diaphragm 30. It is necessary to design so as not to give.
In the present embodiment, the leg portion 180 is designed as follows in order to satisfy all the required characteristics.

The leg part 180 has a narrow part 183 having a narrower width than the end part 181 on the inner annular part side and the end part 182 on the outer annular part side.
In the leg part 180, the height of the rib 180B of the narrow part 183 is configured to be higher than the end part 181 on the inner annular part side and the end part 182 on the outer annular part side.
In the present embodiment, “the thickness of the leg portion 180” is the height of the pair of ribs 180B, and “the width of the leg portion 180” is the distance between the outer surface of one rib 180B and the outer surface of the other rib 180B (= (Size in the circumferential direction).
Therefore, in this embodiment, the thickness of the narrow part 183 is configured to be thicker than the end part 181 on the inner annular part side and the end part 182 on the outer annular part side.

  In the present embodiment, in the narrow portion 183 of the leg portion 180, the pair of ribs 180B has a structure in which the height is increased on the back side as compared with a structure in which the entire rib is made to have an equal thickness.

  In the present embodiment, the narrow portion 183 is continuously widened after the width is continuously narrowed from the inner annular portion 160 side toward the outer annular portion 170 side, and the narrow annular portion 183 is outer from the inner annular portion 160 side. Toward the annular portion 170 side, it is a continuous shape changing portion where the thickness is continuously increased and then continuously decreased (= the rib height is increased and then decreased).

  In the present embodiment, a narrow portion 183 having a narrower width than these ends is provided between the end 181 on the inner annular portion side and the end 182 on the outer annular portion side, so that the width of the central portion is the smallest. ing. And the thickness of the narrow part 183 is made thicker than the end part 181 on the inner annular part side and the end part 182 on the outer annular part side.

As is clear from comparison between FIG. 2C of the present embodiment and FIG. 4D of the conventional structure, the opening area of the opening 153 is increased by narrowing the width of the central portion of the leg portion 180 and the vicinity thereof.
When the width of the connecting portion with the inner annular portion 160 and the connecting portion with the outer annular portion 170 is narrowed, the connection strength between the leg portion 180 and the inner annular portion 160 and the outer annular portion 170 is lowered, which is not preferable. . Further, even if only the width of the connection portion between the inner annular portion 160 or the vicinity thereof and the connection portion between the outer annular portion 170 or the vicinity thereof is reduced, it does not contribute so much to increase the opening area of the opening 153.
In this embodiment, the width of the connecting portion with the inner annular portion 160 and the connecting portion with the outer annular portion 170 is wide as in the prior art, and the connection strength between the leg portion 180 and the inner annular portion 160 and the outer annular portion 170 is increased. Is secured.

  Further, simply providing the narrow portion 183 having a narrower width than the end portion 181 on the inner annular portion side and the end portion 182 on the outer annular portion side reduces the strength of the narrow portion 183. There is a risk of doing. In the present embodiment, the thickness of the narrow portion 183 is increased (= rib height) to ensure the strength of the narrow portion 183.

When the thickness of the entire leg portion 180 is increased, the leg portion 180 comes into contact with the housing or frame of the audio equipment to which the speaker is attached, or other peripheral members, or is too close to the edge 30E of the vibration plate 30. There is a risk of affecting the vibration.
In the present embodiment, the thicknesses (= rib heights) of the end portion 181 on the inner annular portion side and the end portion 182 on the outer annular portion side are the same as in the prior art, and the thickness is only partially increased between them. Therefore, there is no such fear.
In the present embodiment, each of the pair of ribs 180B may have a structure in which the height is increased on the vibration plate 30 side as compared with a structure in which the entire ribs have an equal thickness.

  As described above, in this embodiment, the opening area of the opening 153 is increased while securing the connection strength between the leg 180 and the inner annular portion 160 and the outer annular portion 170 and the strength of the entire leg 180. ing.

The width of the narrow portion 183 is reduced as much as possible to increase the opening area of the opening portion 153, the strength of the entire leg portion 180 can be ensured, and the housing or frame of the audio equipment to which the speaker 2 is attached, or other peripheral members, and It is preferable to increase the thickness of the narrow portion 183 as much as possible within a range that does not affect the vibration plate 30.
Specifically, the leg portion 180 preferably has a minimum width <maximum thickness (= maximum rib height).

As described above, according to the present embodiment, the connection strength of the leg portion 180 and the entire leg portion 180 are not affected without affecting the housing or frame of the audio equipment to which the speaker is attached or other peripheral members and the diaphragm. Can be provided, and the speaker frame 150 capable of reducing the air resistance on the back side of the diaphragm 30 can be provided.
Since the speaker provided with the speaker frame 150 of the present embodiment has a reduced air resistance on the back side of the diaphragm 30, the sound quality is improved as compared with the conventional one.

“Third Embodiment”
A speaker frame according to a third embodiment of the present invention will be described with reference to the drawings.
3A is an overall perspective view of the front side of the speaker frame, FIG. 3B is a partially enlarged view of FIG. 3A, and FIG. 3C is a rear view of the speaker frame.
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The overall structure of the speaker is the same as in the first embodiment.
The speaker frame 250 is the same as in the first embodiment.
An annular bottom magnetic circuit part mounting part 261, a side part 262 projecting forward on the outer periphery of the magnetic circuit part mounting part 261, and a front side end of the side part 262 extending radially outward. An inner annular portion 260 including an annular damper mounting portion 263;
An outer annular portion 270 having a larger diameter than the inner annular portion 260 and to which the edge 30E of the diaphragm 30 is attached;
A plurality of leg portions 280 are provided between the inner annular portion 260 and the outer annular portion 270.

  Also in this embodiment, the leg part 280 has a rear side end connected to the inner annular part 260 and a front side end connected to the outer annular part 270. A plurality of leg portions 280 extend radially from the outer periphery of the inner annular portion 260 toward the front side.

  In this embodiment, four leg portions 280 are provided radially at equal intervals, and a total of four openings 253 are formed between the four leg portions 280.

The speaker frame 250 of the present embodiment is an iron plate frame manufactured by pressing a thin iron plate.
In the speaker frame 250 of this embodiment, a plurality of openings 253 are opened in a cylindrical material connecting the inner annular portion 260 and the outer annular portion 270, and portions where the plurality of openings 253 are not opened are leg portions 280. It has the shape made into.
On the inner peripheral surface of the plurality of openings 253, ribs 253 </ b> A called “edge stands” project from the diaphragm 30 side.

In the present embodiment, the leg portion 280 includes a plate-like portion 280A that faces the diaphragm 30 and a pair of ribs 280B that protrude from both side surfaces of the plate-like portion 280A. A part of the rib 253A formed on the inner peripheral surface of the two adjacent openings 253 forms a pair of ribs 280B.
In the present embodiment, the plate-like portion 280A is disposed on the back surface side, and a pair of ribs 280B are provided so as to protrude from the plate-like portion 280A to the diaphragm 30 side.

In the speaker including the speaker frame 250 of this embodiment, air enters and exits the plurality of openings 253 of the speaker frame 250 as the diaphragm 30 vibrates in the front-rear direction. If the air does not enter and exit smoothly, the accurate amplitude of the diaphragm 30 is hindered, and the frequency characteristics of the speaker output may be deteriorated.
In order to smoothly enter and exit the air, it is preferable to increase the aperture ratio (opening area of the opening) of the speaker frame 250 as much as possible. A larger opening ratio of the speaker frame 250 is preferable because air resistance is reduced.
In order to increase the aperture ratio of the speaker frame 250, it is only necessary to reduce the width (= size in the circumferential direction) of the plurality of legs 280. However, the plurality of legs 280 includes the inner annular portion 260 and the outer annular portion 270. It is necessary to have sufficient connection strength between them and sufficient strength to support the heavy magnetic circuit unit 10.
Further, the plurality of legs 280 do not contact the housing or frame of the audio equipment to which the speaker is attached, or other peripheral members, and are sufficiently separated from the diaphragm 30, particularly the edge 30E, to affect the vibration of the diaphragm 30. It is necessary to design so as not to give.
In the present embodiment, the leg portion 280 is designed as follows in order to satisfy all the required characteristics.

The leg portion 280 has a narrow portion 283 having a narrower width than the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side.
In the leg part 280, the height of the rib 280B of the narrow part 283 is configured to be higher than the end part 281 on the inner annular part side and the end part 282 on the outer annular part side.
In this embodiment, “the thickness of the leg portion 280” is the height of the pair of ribs 280B, and “the width of the leg portion 280” is the distance between the outer surface of one rib 280B and the outer surface of the other rib 280B (= (Size in the circumferential direction).
Therefore, in this embodiment, the narrow portion 283 is configured such that the thickness of the narrow portion 283 is thicker than the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side.

  In the present embodiment, the narrow portion 283 of the leg portion 280 has a structure in which the thickness is increased on the diaphragm 30 side as compared with a structure in which the entire leg portion 280 is made to have a uniform thickness.

  In the present embodiment, the narrow portion 283 is continuously widened from the inner annular portion 260 side toward the outer annular portion side 270 after the width is continuously narrowed, and the narrow portion 283 is outer from the inner annular portion 260 side. Toward the annular portion 70 side, it is a continuous shape changing portion where the thickness is continuously increased and then continuously decreased (= the rib height is increased and then decreased).

  In the present embodiment, a narrow portion 283 having a width narrower than these end portions is provided between the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side so that the width of the central portion is the smallest. ing. The narrow portion 283 is made thicker than the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side.

As is clear from comparison between FIG. 3C of the present embodiment and FIG. 4D of the conventional structure, the opening area of the opening 253 is expanded by narrowing the width of the central portion of the leg portion 280 and the vicinity thereof.
When the width of the connecting portion with the inner annular portion 260 and the connecting portion with the outer annular portion 270 is reduced, the connection strength between the leg portion 280, the inner annular portion 260 and the outer annular portion 270 is lowered, which is not preferable. . Further, even if only the width of the connection portion between the inner annular portion 260 or the vicinity thereof and the connection portion between the outer annular portion 270 or the vicinity thereof is reduced, it does not contribute much to the increase in the opening area of the opening 253.
In the present embodiment, the width of the connecting portion with the inner annular portion 260 and the connecting portion with the outer annular portion 270 is wide as in the conventional case, and the connection strength between the leg portion 280 and the inner annular portion 260 and the outer annular portion 270 is increased. Is secured.

  Further, simply providing the narrow portion 283 having a narrower width than the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side reduces the strength of the narrow portion 283. There is a risk of doing. In this embodiment, the thickness of the narrow portion 283 (= rib height) is increased to ensure the strength of the narrow portion 283.

When the thickness of the entire leg portion 280 is increased, the leg portion 280 comes into contact with the housing or frame of the audio equipment to which the speaker is attached, or other peripheral members, or is too close to the edge 30E of the vibration plate 30 and thus the vibration plate 30. There is a risk of affecting the vibration.
In the present embodiment, the thicknesses (= rib heights) of the end portion 281 on the inner annular portion side and the end portion 282 on the outer annular portion side are the same as in the prior art, and the thickness is only partially increased between them. Therefore, there is no such fear.

As described above, in this embodiment, the opening area of the opening 253 is increased while securing the connection strength between the leg 280 and the inner annular portion 260 and the outer annular portion 270 and the strength of the entire leg 280. ing.
The width of the narrow portion 283 is reduced as much as possible to increase the opening area of the opening portion 253, the strength of the entire leg portion 280 can be ensured, and the housing or frame of the audio equipment to which the speaker is attached, or other peripheral members, and vibration It is preferable to increase the thickness of the narrow portion 283 as much as possible within a range that does not affect the plate 30.
Specifically, the leg portion 280 preferably has a minimum width <maximum thickness (= maximum rib height).

As described above, according to the present embodiment, the connection strength of the leg portion 280 and the leg portion 280 are not affected without affecting the housing or frame of the audio equipment to which the speaker is attached or other peripheral members and the diaphragm 30. It is possible to provide the speaker frame 250 in which the overall strength is ensured and the air resistance on the back side of the diaphragm 30 can be reduced.
Since the speaker provided with the speaker frame 250 of the present embodiment has a reduced air resistance on the back side of the diaphragm 30, the sound quality is improved as compared with the conventional one.

"Design changes"
The present invention is not limited to the above-described embodiment, and the design can be changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Speaker 10 Magnetic circuit part 20 Voice coil 21 Voice coil bobbin 30 Diaphragm 30E Edge 40 Damper 50, 150, 250 Speaker frame 60, 160, 260 Inner ring part 61, 161, 261 Magnetic circuit part attaching part 62, 162, 262 side Portions 63, 163, 263 Damper mounting portions 70, 170, 270 Outer annular portions 80, 180, 280 Leg portions 80A Diaphragm facing surface 80B Rear surface 80C Side surfaces 180A, 280A Plate-like portions 180B, 280B Ribs 81, 181, 281 Inner ring Ends 82, 182, and 282 on the part side Ends 83, 183, and 283 on the outer annular part side Narrow part

Claims (6)

A speaker frame used for a speaker comprising a magnetic circuit unit, a voice coil inserted into a gap in the magnetic circuit unit, a voice coil bobbin holding the voice coil, and a diaphragm connected to the voice coil bobbin. And
An inner annular part to which the magnetic circuit part is attached;
An outer annular portion having a larger diameter than the inner annular portion, to which an edge of the diaphragm is attached;
A plurality of legs connecting the inner annular portion and the outer annular portion;
The leg portion is narrower than the end portion on the inner annular portion side and the end portion on the outer annular portion side between the end portion on the inner annular portion side and the end portion on the outer annular portion side. A speaker frame having a narrow portion and a thickness of the narrow portion being thicker than an end portion on the inner annular portion side and an end portion on the outer annular portion side.   The narrow portion is continuously widened from the inner annular portion side toward the outer annular portion side after the width is continuously narrowed, and from the inner annular portion side to the outer annular portion side. The speaker frame according to claim 1, further comprising a continuous shape change portion that continuously decreases after the thickness is continuously increased.   The speaker frame according to claim 1, wherein the narrow portion has a structure in which the thickness is increased on the diaphragm side or a structure in which the thickness is increased on the back side of the speaker.   The leg portion includes a diaphragm facing surface facing the diaphragm, a back surface facing the diaphragm facing surface, and a pair of side surfaces formed between the diaphragm facing surface and the back surface. The speaker frame according to claim 1.   The said leg part is provided with the plate-shaped part which faces the said diaphragm, and a pair of rib protruded in the same direction on the both sides | surfaces of the said plate-shaped part. Speaker frame. A speaker comprising: a magnetic circuit unit; a voice coil inserted into a gap in the magnetic circuit unit; a voice coil bobbin that holds the voice coil; a diaphragm connected to the voice coil bobbin; and a speaker frame. ,
The speaker frame is
An inner annular part to which the magnetic circuit part is attached;
An outer annular portion having a larger diameter than the inner annular portion, to which an edge of the diaphragm is attached;
A plurality of legs connecting the inner annular portion and the outer annular portion;
The leg portion is narrower than the end portion on the inner annular portion side and the end portion on the outer annular portion side between the end portion on the inner annular portion side and the end portion on the outer annular portion side. A speaker having a narrow portion, wherein the narrow portion is thicker than the end portion on the inner annular portion side and the end portion on the outer annular portion side.

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