JP2007306468A - Speaker frame and forming method of speaker frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker frame formed by folding a metallic plate whereby sound quality of a speaker can simply be improved. <P>SOLUTION: A speaker frame rear part 1a formed nearly circular with a step wherein parts of the circle are sectorially extended in an opposite manner; large and small slopes whose diameters are different from each other and gradually extended toward a speaker frame front part 1b in a way consecutive to the speaker frame rear part 1a and which are formed by sandwiching a step difference; the speaker frame front part 1b extended nearly rectangularly in a way consecutive to the large and small slopes; and rib parts 1e formed by respectively opening (opening parts 1f) the large and small slopes in a way that the step difference part is left in nearly a Z shape in rear view, are formed by folding the one metallic plate to form the speaker frame 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker frame that is a constituent member of a speaker and a method for forming the speaker frame.

A speaker frame, which is a constituent member of the speaker, is generally formed in a substantially mortar shape in which an opening for sound removal is formed on the back side of the diaphragm.
The molding method of the speaker frame formed in this way is a die casting method mainly used for high-end speakers and a drawing method mainly used for general speakers (processing by narrowing a metal plate). Alternatively, there is injection molding using a resin material (for example, see Patent Document 1).

  In any case, as described above, these speaker frames are formed with openings for sound removal, but the ribs connecting the speaker frame front part and the speaker frame rear part that form the openings are, for example, patents. As shown in Document 1, the thin portion is wide in the circumferential direction.

By the way, as a means for easily improving the sound quality of the speaker, for example, it is to reduce resistance to the movement of a diaphragm such as cone paper. For this purpose, a rib portion connecting the above-mentioned speaker frame front portion and the speaker frame rear portion is used. It is very effective to reduce the width in the circumferential direction to form a large opening.
Japanese Unexamined Patent Publication No. 2000-102093 (first page, FIG. 1)

  However, as described above, the rib portion connecting the front portion of the speaker frame and the rear portion of the speaker frame is generally a thin portion that is wide in the circumferential direction, and in particular, drawing molding that can be produced at a very low cost. In the case of the speaker frame according to the above, if the circumferential width of the rib portion is simply reduced, the strength is insufficient, and there is a limit to reducing the circumferential width of the rib portion.

  Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a speaker frame and a method for forming the speaker frame that can solve the above-described problems.

In order to achieve the above technical problem, a speaker frame and a method for forming a speaker frame according to the present invention employ the following technical means.
That is, the speaker frame according to the present invention is a substantially mortar-shaped speaker frame in which an opening for sound removal is formed on the back side of the diaphragm, and is integrally formed by bending a metal plate. A rib portion extending in a substantially normal direction and connecting the front portion of the speaker frame and the rear portion of the speaker frame is formed at a predetermined interval in the circumferential direction, and the inclined surface formed between the rib portions is opened to open the rib portion. It is characterized by being an opening.
The speaker frame according to the present invention is the speaker frame according to the present invention, wherein the rear part of the speaker frame is formed in a stepped substantially circular shape with a circular part projecting in a fan shape and is continuous with the rear part of the speaker frame. In this way, large and small inclined surfaces with different diameters gradually expanding toward the front portion of the speaker frame are formed across the steps, and the step portions are used as the rib portions, and the large and small inclined surfaces are respectively opened. The opening is used.
Moreover, the speaker frame according to the present invention is characterized in that, in any one of the inventions, the rib portion is formed in a substantially Z shape in a rear view.
The speaker frame forming method according to the present invention is a method for forming a substantially mortar-shaped speaker frame in which an opening for sound removal is formed on the back side of the diaphragm, and a single metal plate is drawn. Therefore, the rear part of the speaker frame is formed into a stepped substantially circular shape with a circular part projecting in a fan shape when viewed from the rear, and the diameter gradually increases toward the front part of the speaker frame so as to be continuous with the rear part of the speaker frame. Then, it has a drawing step for forming large and small inclined surfaces with different diameters across a step, and a punching step for opening the large and small inclined surfaces so that the step portion remains.

  According to the present invention, the rib portion that connects the front portion of the speaker frame and the rear portion of the speaker frame is integrally formed by bending the metal plate, and extends in a substantially normal direction when viewed from the back, and further, between the rib portions. Since the formed inclined surface is opened and configured as an opening for sound removal, the circumferential width of the rib portion can be greatly reduced without insufficient strength, and thus the sound quality of the speaker can be easily improved. it can.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
As shown in FIGS. 1 to 3, the speaker frame 1 according to the present embodiment has a substantially circular shape with a stepped fan shape so that a circular portion with a central portion protruding in a bowl shape faces each other. The formed speaker frame rear portion 1a, and large and small inclined surfaces 1c, 1d (diameters having different diameters formed by being gradually enlarged toward the speaker frame front portion 1b so as to be continuous with the speaker frame rear portion 1a with a stepped portion therebetween. Note that the molded speaker frame 1 does not have large and small inclined surfaces 1c and 1d, and an opening 1f is formed in such a portion, which will be described for convenience of description), and the large and small inclined surfaces 1c and 1d. The speaker frame front portion 1b projecting in a substantially rectangular shape so as to be continuous and the large and small inclined surfaces 1c and 1d are opened (opening portion 1f) so that the stepped portion remains in a substantially Z shape in the back view. Formed with the rib portion 1e is shaped by bending a single metal plate.

The speaker frame 1 formed in this way is formed by the following procedure.
A blank having a substantially rectangular metal plate as a blank, and a pair of molds in which the speaker frame rear portion 1a, the large and small inclined surfaces 1c and 1d, and the speaker frame front portion 1b are integrally molded, Press and draw (drawing process). By this drawing step, a container-like frame before the opening 1f is opened is formed as shown in FIG.

  Next, the punching process for forming the rib portion 1e is started, but before that, depending on the specifications of the speaker frame 1, there may be provided a protruding piece 1g protruding from the rear portion 1a of the speaker frame as shown in FIG. . In this case, in the above-described drawing step, a pillar portion having a U-shaped cross section is integrally formed from the speaker frame rear portion 1a to the speaker frame front portion 1b so that a convex piece 1g as shown in FIG. 5 is formed. The protruding piece 1g is formed by punching and pressing unnecessary column portions.

  When the above-described convex piece 1g is formed, or when the convex piece 1g is not necessary, when the above-described drawing process is completed, the punching process for forming the rib portion 1e is started. This punching process is performed by a punching press in the same manner as the formation of the convex piece 1g. That is, the large and small inclined surfaces 1c and 1d are opened by punching presses so that the connecting portions of the large and small inclined surfaces 1c and 1d (regions indicated by hatching in FIG. 6), that is, the stepped portions remain substantially Z-shaped. At the same time, the rib portion 1e is formed, and at the same time, the opening portion is formed with an opening portion 1f for sound removal, and the molding of the speaker frame 1 is completed (perforation process).

  The hole 1h provided in the speaker frame rear part 1a, the speaker frame front part 1b, or the convex piece 1g is preferably drilled after the drilling step, but the hole 1h may be drilled in advance in the blank. Good, not particularly limited.

  As described above, the speaker frame 1 according to the present embodiment is integrally formed by bending the metal plate as described above, and the rib portion 1e that connects the speaker frame front portion 1b and the speaker frame rear portion 1a in a rear view is substantially a method. It extends in the line direction and is formed at a required interval in the circumferential direction, and an inclined surface formed between the rib portions 1e is opened to form an opening 1f for sound removal.

  As shown in FIG. 7, the speaker frame 1 according to the present embodiment includes a pole 2 inserted from the speaker frame rear part 1a, a magnet 3 sandwiched between the speaker frame rear part 1a and the base part of the pole 2, and a pole 2 The speaker S is constituted by the other constituent members such as the bobbin 4 loosely inserted in the front end of the first and second diaphragms and the diaphragm 5 having one end connected to the bobbin 4 and the other end connected to the speaker frame front portion 1b.

  The speaker frame 1 according to the present embodiment configured as described above can greatly reduce the circumferential width of the rib portion 1e without insufficient strength. Therefore, as shown in FIG. The speaker S using the speaker frame 1 according to the embodiment can easily improve the sound quality of the speaker S.

  Although specific embodiments have been described above, the present invention is not limited to the above-described embodiments, and it is needless to say that the embodiments can be appropriately modified and implemented without changing the gist of the invention.

It is a back side perspective view of the speaker frame concerning this Embodiment. 2 is a rear view of the speaker frame. FIG. It is sectional drawing which follows the AA line of FIG. It is a rear view of the speaker frame before an opening part is opened. It is the back side perspective view of a speaker frame, and is explanatory drawing which showed the process process in the case of forming a convex piece. It is the rear view of the speaker frame before an opening part is opened, and is explanatory drawing which showed the opening area | region. It is the front view which notched the right half of the speaker using the speaker frame concerning this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker frame 1a Speaker frame rear part 1b Speaker frame front part 1c, 1d Large and small inclined surface 1e Rib part 1f Opening part 1g Convex piece 1h Hole 2 Pole 3 Magnet 4 Bobbin 5 Diaphragm S Speaker

Claims (4)

A substantially mortar-shaped speaker frame in which an opening for sound removal is formed on the back side of the diaphragm,
A metal plate is bent and integrally formed, and a rib portion extending in a substantially normal direction and connecting the front portion of the speaker frame and the rear portion of the speaker frame is formed at a required interval in the circumferential direction, A speaker frame characterized in that an inclined surface formed between ribs is opened to form the opening. The rear part of the speaker frame is formed in a stepped substantially circular shape with a circular part extending in a fan shape when viewed from the back.
Large and small inclined surfaces with different diameters are formed with a step in between and gradually expanded toward the front part of the speaker frame so as to be continuous with the rear part of the speaker frame,
2. The speaker frame according to claim 1, wherein the step portion is the rib portion, and the large and small inclined surfaces are opened to form the opening portion.   The speaker frame according to claim 1, wherein the rib portion is formed in a substantially Z shape when viewed from the back. A method of forming a substantially mortar-shaped speaker frame in which an opening for sound removal is formed on the back side of the diaphragm,
The speaker frame is formed by drawing a single metal plate, and the rear part of the speaker frame is formed into a stepped, substantially circular shape with a circular part projecting in a fan shape, as viewed from the back, and the speaker is continuous with the rear part of the speaker frame. A squeezing step of gradually increasing the diameter toward the front of the frame and forming large and small inclined surfaces with different diameters across a step;
A method for forming a speaker frame, comprising: a perforating step for opening the large and small inclined surfaces so that the stepped portion remains.

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