JPS62136196A - Small size electric acoustic converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This invention relates generally to compact electroacoustic transducers;
More particularly, the present invention relates to a novel speaker driver that provides high electroacoustic performance in a compact structure that is relatively easy and inexpensive to fabricate.

(Technical background) As background technology, Thomas A.
Roeschle's [LOUDSPE] loudspeaker with a single-layer rectangular wire voice coil wound on a slitted metal bobbin with cutouts in adjacent pole plates.
AKERWITH SINGLg LAYER RECTA
NGULARWIRE VOI'CE C0IL WO
UNDON 5LIT METAL BOBBI
N WITHA N0TCHIN THI (ADJ
No. 4,061,890 entitled ACENT POLE PLATE) and June 1, 1979.
William Jay Keyser (Wi.
[DYNAMICLOUDSL] 1 JAKfi Co., Ltd. (Liam J, Keczer)
WITHPLASTIC BASKET ENCAPS
No. 4,158,756, entitled ULATINGFRONT POLEPLATE) J. These U.S. patents cover the commercially available BOSE 901 speaker system and the BOSE 901 speaker system and the ELCO-GM-Rose.
"Speakers embodied in music systems"
The vehicle is disclosed. These U.S. patents describe a molded plastic cage made of thermoplastic polyester with a glass fill and a low magnetic resistance front molded into the base of said cage with a keyed center hole. A speaker driver is disclosed that includes a magnetic pole plate.

The motor structure is located behind the shaped pole plates. The edges of the spider, which resiliently support the voice coil, are fixed to an annular surface inside the cage. A low resistance single layer anodized aluminum rectangular wire voice coil is wound onto a slitted anodized aluminum bobbin. There is a notch in the adjacent pole plate due to the return length of the voice coil wire. This loudspeaker/driver exhibits excellent electroacoustic and mechanical properties and operates satisfactorily under a wide range of environmental conditions.

SUMMARY OF THE INVENTION It is an important object of the present invention to provide an improved speaker driver.

According to the present invention, a speaker includes a motor structure disposed in front of a cone, and a spider behind the motor structure elastically supports a rear edge of a voice coil;
There is a driver. The cage is preferably made of plastic and is provided with rivets that are ultrasonically bonded to the cage at the terminals. The flat flexible gold thread lead passes through a slit in the cone and reaches the terminal. The cage is formed with radial ribs for acoustic conduction and structural support, and the lips are formed with a cup of low reluctance magnetic material, which includes a flexible voice coil lead. An axial notch is formed in the inner surface for accommodating the.

DESCRIPTION OF THE EMBODIMENTS Referring to FIGS. 1-3, an annular recess 13 for receiving the leading edge of a voice coil assembly 14 is shown.
A and the axial lead 14A' from the front end of the voice coil 14B! ! - a plastic cage section 11 supporting a rearward-opening molded cup-shaped front pole piece 13 formed with an axial recess for accommodating it and covered by a circular scrim; 2 are shown respectively a largely exploded view, a rear plan view, and a cross-sectional view taken along section line 3--3 of FIG.

The voice coil 14B is supported on a cylindrical aluminum sheet with an axial slit. A neodymium disk magnet 15 cooperates with the closed end of the front pole piece 13 and with the front cup-shaped pole piece 13. It is sandwiched between the disc-shaped rear pole plate and defines an annular gap for accommodating the voice coil assembly 14, and defines a gap between the rear pole plate 16 and the cylindrical wall of the front pole piece 13. A radial magnetic field is generated between them.

The plastic cage section 17 mates with the plastic cage section 11 and is ultrasonically bonded thereto. Plastic basket forming part 1
At 7, there is a built-in pole l made of plastic rivets that fixes the terminal 18 to the plastic cage-shaped part 17.
-17A is formed. The terminal 18 is connected to each of the flat gold thread leads 21 whose other ends are swaged to the respective voice coil leads.

The gold thread lead is taken out through a slit located in a plane perpendicular to the axis of the speaker assembly. cone 2
Two annular edges are attached between the mating annular surfaces of the plastic cage section 11 and the rear section 17.

Spider 23 resiliently supports the rear edge of voice coil assembly 14, and its outer annular edge is ultrasonically bonded to dimpled annular rim 17B. The assembly is completed with a dust cover.

Referring to FIG. 4, there is shown an enlarged view illustrating the joints of the spider 23, the cone 22, and the voice coil support 14C.

Looking at FIG. 5, the disc-shaped magnet 15 and the disc-shaped rear magnetic pole &
An enlarged view of a portion of the annular motor gap between 16 and the upright circular wall of the front pole piece 13 is shown.

No. 51g All-metal brother and plastic basket cedar oil part 11
and the rear portion 17 of the same are fixed together with the annular rim of the cone 22 between them.
A diagram according to -6 is shown.

FIG. 7 shows a cross-sectional view of the gold thread-voice coil connection section illustrating the connection between the voice coil 7Fsa and the flat gold thread lead, and FIG. 8 shows the cutting line of FIG. 7. 8
-8. The gold thread lead 21 and the voice coil electric wire 31 are surrounded in an overlapping manner by a caulking band 32 which is crushed to a depth of 1,000 liters as shown in the figure to ensure good electrical and mechanical contact with the gold thread 21. In order to provide a space in which the coiled wire 31 can move from the caulking band 32 without being damaged, the coiled wire 31
There is a small space 33 between the caulking band 32 and the crimping band 32 as shown in FIG.

9 and 1O, there are shown partial plan and elevation views, respectively, of a crimping band 32 made of a preferred form of crimping material. As best shown in FIG. 10, the preferred caulking material is of a sawtooth cross-section with peaks such as 32A above valleys such as 32B. In the 11th model), this material is semi-rigid steel finished with thin soot plate with a plating thickness in the range of 0.001 to 0.0003 inches. base&!
The thickness from 32c to the top like 32A is generally o,
o o s'' ±o, ooos'', and the distance from the base line 32C to a valley such as 32B is generally 0.
00035"+0.0000-0.0005".

The length of caulking 32 is generally 0.115” +0.OOO
−0,005″.

This aspect of the invention has solved an important problem.

It has been found that when using a flat staking material, the lead resistance changes with cone movement, introducing undesirable variable resistance modulation into the reproduced audio signal. It was found that the cause of this problem was variation in resistance compensation at the caulked connection. The caulking material construction shown in FIGS. 9 and 10 overcomes this problem. This structure provides a fairly large surface area for establishing contact with conductive leads 31.

The wire 31 passes through any insulation therein and connects to the wire 32.
Spread around a point like A to establish a low resistance contact.

This microstructure, with no more than 4 mils between peaks and valleys, establishes this good contact while avoiding breakage of the wire 31, making it an excellent electrical conductor that is particularly compact and can be produced in a mass production manner. A novel full-circle speaker driver, which is particularly distinguished by its acoustic and mechanical properties, has been described. It is likely that the present inventor may make many uses, modifications, and developments of the specific embodiments described herein without departing from the inventive concept. '4It is clear that Accordingly, this invention is to be construed as encompassing the apparatus disclosed herein and all novel features and novel combinations of features existing in the art or proprietary thereto.

[Brief explanation of drawings]

FIG. 1 is a largely exploded view of a speaker driver according to the invention. FIG. 2 is a rear plan view of one embodiment of the present invention. FIG. 3 is a sectional view taken along cut edge 3-3 in FIG. FIG. 4 is an enlarged detail showing the joint between the spider, cone and voice coil support. - Figure 5 is an enlarged view of a portion of the annular motor gap. FIG. 6 is a cross-sectional view taken along cut edge 6-6 of FIG. FIG. 7 is a sectional view of the gold thread-voice coil connection section. FIG. 8 is a cutaway of FIG. 7; a 1@ side view by Chen 8-8. 9 is a partial plan view of a preferred form of caulking material according to the invention - FIG. 10 is a partial elevational view of the caulking material of FIG. 13 is a cup-shaped front magnetic pole piece, 1 and ■ are voice coil assemblies, 1
4A is an axial lead, 14B is a voice coil, 14C is a voice coil support, 15 is a disc-shaped magnet, [6 is a rear magnetic pole plate, 17 is a cage-shaped portion, 17A is a stud bolt,
17B is an annular rim, 18 is a terminal, 21 is a flat gold thread lead, 22 is a cone, 23 is a spider, 31 is a voice coil electric wire, and 32 is a caulking band. (5 other people) FIG, 2 FIG, 3 FIG, 4 FIG, 5 FIG
,6

Claims (19)

[Claims] (1) a motor device capable of applying a corresponding mechanical displacement in response to an input electrical signal; a squirrel cage device for supporting said motor device in a central position between a front portion and a rear portion; a cone device coupled to a motor device and capable of converting mechanical displacements of said motor device into acoustic energy; a device comprising a spider device capable of supporting a cone device, the motor device being between the cone device and the front surface. (2) the motor device includes a voice coil device for converting an input electrical signal into a corresponding magnetic field signal, and a rear end of the cone device is in contact with the voice coil device; said device for supporting said cone device is connected between said voice coil device and said rear portion and capable of resiliently supporting said voice coil and said cone device; The speaker driver according to claim 1, comprising the spider device. (3) the motor device has a cup-shaped front pole piece of low magnetic resistance material molded in the front portion of the squirrel cage device, the open end of which faces rearward; a disc-shaped rear pole plate made of a resistive magnetic material; and a disc-shaped permanent magnet sandwiched between said rear pole plate and a closed end of said front pole plate, said front Claim 1, further comprising: the disk-shaped permanent magnet defining an annular gap between the peripheral wall surface of the magnetic pole plate, the disk-shaped magnet and the rear magnetic pole plate. The speaker driver described. (4) the motor device has a cup-shaped front pole piece of a low magnetic resistance material molded in the front portion of the squirrel cage device, the open end of which faces rearward; a disc-shaped rear pole plate made of a resistive magnetic material; and a disc-shaped permanent magnet sandwiched between said rear pole plate and a closed end of said front pole plate, said front the disk-shaped permanent magnet defining an annular gap between the peripheral wall surface of the magnetic pole plate, the disk-shaped magnet and the rear magnetic pole piece; The speaker driver according to claim 2, wherein the speaker driver is supported so as to be axially movable within the annular gap. (5) said squirrel cage device is made of plastic, and further includes first and second terminals fixed to said squirrel cage device, and respective ones of said terminals connected to respective ones of said voice coil devices; 5. The speaker driver according to claim 4, further comprising: flat gold thread conductive leads interconnecting ends of the speaker driver. (6) An annular rim is formed at the rear of the cage device, and the spider device includes a scrim peripherally bonded to the annular rim at the rear of the cage device. A speaker driver according to claim 2. (7) The motor device has a cup-shaped front pole piece made of a low magnetic resistance material formed in the front portion of the squirrel cage device, the open end of which faces rearward; a disc-shaped rear pole plate made of a resistive magnetic material; and a disc-shaped permanent magnet sandwiched between said rear pole plate and a closed end of said front pole plate, said front The above-mentioned disk-shaped permanent magnet defines an annular gap between a peripheral wall surface of the magnetic pole plate and a structure formed by the disk-shaped magnet and the rear magnetic pole plate. The speaker driver according to item 6. (8) The speaker driver according to claim 1, wherein the spider device is bonded to the squirrel cage device by ultrasonic waves. (9) The speaker driver according to claim 8, wherein the spider device includes a scrim whose periphery is adhered to the cage device by ultrasonic waves. (10) The speaker driver according to claim 6, wherein the scrim is bonded to the annular surface by ultrasonic waves. (11) The speaker driver according to claim 7, wherein the scrim is attached to the annular rim by ultrasonic bonding. (12) a cage device for supporting components of a speaker driver; first and second terminals fixed to the cage device; a voice coil device having the first and second terminals; a device for supporting said voice coil device in a squirrel cage device; and a first interconnecting said first and second terminals, respectively, to said first and second terminals of said voice coil device.
and a second flat metal thread conductive lead. (13) The speaker driver according to claim 12, comprising: a flat crimping device for mechanically and electrically bonding each flat gold thread conductive lead to each voice coil end. . (14) A cone that is fixed to the voice coil device supported in the squirrel cage device, and has first and second slits formed near the voice coil device, and has a cone that moves only slightly. The speaker driver according to claim 13, comprising: the first and second flat gold thread leads passing through the first and second slits, respectively. (15) A cone that is fixed to the voice coil device supported in the squirrel cage device and has first and second slits formed near the voice coil device with slight cone movement. 13. The speaker driver according to claim 12, wherein the first and second flat gold thread leads pass through the first and second slits, respectively. (16) A caulking material consisting of a thin conductive material on the order of 10 mils thick that has a finely pointed pattern formed on at least one surface to establish good conductive contact with the conductive lead to be caulked. . (17) The flat crimping device is made of a crimping material of a conductive material on the order of 10 mils thick with a finely pointed surface formed on at least one surface for snugly contacting the end of the voice coil. The speaker driver according to claim 15. (18) The first and second flat gold thread leads extend radially along the cone, respectively.
15. The speaker driver according to claim 14, wherein the speaker driver extends from a voice coil end of the voice coil through the first and second slits to the first and second terminals, respectively. (19) Said flat crimping device has a thickness on the order of 10 mils with fine pointed patterns formed on one side to establish good electrical and mechanical contact with the end of the voice coil. 19. The speaker driver according to claim 18, wherein the speaker driver is made of caulking material of a conductive material.