SPEAKER AND METHOD OF ASSEMBLING SAME

• US 20120002837A1
• Filed: 04/11/2011
• Published: 01/05/2012
• Est. Priority Date: 06/30/2010
• Status: Abandoned Application

• Current Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: OUCHI, Tomoharu
• Application Number:
  US13/083,920
• Publication Number:
  US 20120002837A1
• Time in Patent Office: Days
• US Class Current: 381/412
• CPC Class Codes: H04R 1/06 Arranging circuit leads; Relieving strain on circuit leads
• CPC Class Codes: Y10T 29/49005 Acoustic transducer

Abstract

There is provided a speaker which has a frame structure divided into a first frame and a second frame, wherein tinsel wires are arranged so as not to overlap, with respect to the plane direction, the second frame to which a magnetic circuit is attached, whereby the second frame can be arranged as forward as possible thus enabling reduction of the thickness of the speaker. Also, the first frame and the second frame are both provided with respective frame connection mechanisms and therefore can be easily positioned and connected to each other thus enhancing the workability. The speaker enables further reduction of the thickness without deteriorating input durability and bass range reproduction capability and can be produced with an excellent assembly workability.

Claims

1. A speaker comprising:

a diaphragm having an elongated plate-like shape;

a first frame disposed rearward of the diaphragm;

a surround, an inner circumference of which is connected to the diaphragm and an outer circumference of which is connected to a front face of the first frame;

a pair of spider units disposed between the diaphragm and the first frame, separated from each other in a direction of a major axis of the first frame, and connected to the diaphragm and the first frame;

a voice coil bobbin attached at a center of the diaphragm;

a second frame disposed so as to surround an outer circumference of the voice coil bobbin and connected to the first frame, wherein the second frame comprises;

a circular cylinder portion having a hollow; and

a frame connection mechanism disposed at an outer circumference of the circular cylinder portion and connected to the first frame;

a magnetic circuit attached at a center of the second frame so as to be located within the circular cylinder portion;

a voice coil wound around the voice coil bobbin and suspended in a magnetic gap of the magnetic circuit;

tinsel wires connected to lead wires extending respectively from ends of the voice coil, wherein the tinsel wires are disposed radially outward of the outer circumference of the circular cylinder portion of the second frame so as to be located at an area along the major axis of the first frame; and

terminals attached to the first frame and connected to ends of the tinsel wires.

2. A speaker according to claim 1, wherein the frame connection mechanism of the second frame comprises:

a plurality of first fixing blocks which protrude from the outer circumference of the circular cylinder portion so as to extend radially outwardly along a direction of a minor axis of the first frame; and

a plurality of second fixing blocks which protrude from the outer circumference of the circular cylinder portion so as to extend radially outwardly along the direction of the major axis of the first frame, and wherein the second fixing blocks are disposed rearward of a front face of the magnetic circuit to thereby prevent the tinsel wires from interfering with the second fixing blocks.

3. A speaker according to claim 1, wherein each of the pair of spider units comprises:

a plurality of spider elements which are arrayed along a direction of a minor axis of the first frame;

a first connecting member adapted to connect respective one ends of the spider elements and attached to a rear side of the diaphragm; and

a second connecting member adapted to connect respective other ends of the spider elements and attached to the first frame, and wherein the lead wire is disposed along the first connecting member, and a connection point between the lead wire and the tinsel wire is arranged at an area located along the first connecting member so as not to overlap the circular cylinder portion and the frame connection mechanism of the second frame with respect to a plane direction.

4. A speaker according to claim 1, wherein the pair of spider units are disposed along the major axis of the first frame so as to sandwich the voice coil bobbin.

5. A method of assembling a speaker which comprises:

a diaphragm having an elongated plate-like shape;

a first frame disposed rearward of the diaphragm;

a surround, an inner circumference of which is connected to the diaphragm and an outer circumference of which is connected to a front face of the first frame;

a pair of spider units disposed between the diaphragm and the first frame, separated from each other in a direction of a major axis of the first frame, and connected to the diaphragm and the first frame;

a voice coil bobbin attached at a center of the diaphragm;

a second frame comprising a hollow circular cylinder portion, disposed so as to surround an outer circumference of the voice coil bobbin, and connected to the first frame;

a magnetic circuit attached at a center of the second frame;

a voice coil wound around the voice coil bobbin and suspended in a magnetic gap of the magnetic circuit;

tinsel wires connected to lead wires extending respectively from ends of the voice coil; and

terminals attached to the first frame and connected to ends of the tinsel wires, wherein the method comprises;

a process in which a spider assembly built such that the pair of spider units are connected to each other via connecting members is attached to the first frame, then the spider assembly is attached to a rear face of the diaphragm to which the surround is previously attached, and the surround is attached to the front face of the first frame;

a process in which the connecting members of the spider assembly are removed, and then the voice coil bobbin which is previously provided with the voice coil and the lead wires connected with the tinsel wires is attached to the diaphragm from a rear side of the first frame;

a process in which the lead wires and the tinsel wires are guided within the first frame from the rear side of the first frame, and the ends of each of the tinsel wires are connected respectively to the terminals;

a process in which the second frame is connected to the first frame in such a manner that the hollow circular cylinder portion of the second frame surrounds the outer circumference of the voice coil bobbin; and

a process in which the magnetic circuit is attached inside the circular cylinder portion of the second frame from a rear side of the second frame.