JPS5941999A - Speaker unit - 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 This invention relates generally to a 71-force device, and more particularly to a 71-force device.
1. A high frequency f-f acoustic transducer is a device that allows audio frequency signals to be divided into upper and lower ranges for V6 fidelity reproduction from a converter specifically made for high fidelity.
It is well known that the structure and even the operating principle can differ considerably from low frequency converters. Separately operable transducers that can faithfully reproduce sound within a given frequency band have long been available. Efforts to reproduce high-fidelity sound on the Human Moon will require as many frequency divisions and conversions as possible, such as whether one transducer should be operated very much within its assigned frequency range if frequency division is required. The goal is to determine how the transducers should be used, how the transducers should be arranged and combined with each other, and perhaps a number of other considerations, both broad and narrow.

It has been the practice for some time to provide speaker systems in which the audible signal is separated into upper and lower frequencies and distributed to transducers specifically made to best reproduce high and low frequency sounds.

Also, for various reasons, it has been common practice to create a combination of two or more transducers in a single assembly in which the high frequency transducer is mounted coaxially with respect to the low frequency transducer.

Coaxial loudspeakers have used completely free-standing transducers in the past, but their interrelationships are almost entirely a matter of mechanical arrangement with some care given to the resulting acoustic effects. [Coaxial] loudspeaker systems generally use one or more high-frequency drivers mounted above a low-frequency device by post or bridge-like supports, often resulting in phase cancellation between the drivers and diffraction due to the support device. It has irregular frequency response characteristics due to the effect.

It is also well known that there are at least two types of drive mechanisms in acoustic transducers: the hydraulic coil type, the nl moving coil type, and the piezoelectric type.

The speaker device of the present invention can be assembled into one assembly.
The device includes a low frequency dynamic radiator-type converter or woofer and one or more high frequency transducers or tweeters, but does not require the sophisticated and expensive mounting methods of the prior art. The woofer unit is generally a permanent magnet, nJ moving coil 11qa, and its dynamic
A radiator is a diaphragm. The tweeter includes a diaphragm of small diameter that extends into the space formed by the diaphragm and on the apex of which is placed a driver mechanism including a piezoelectric element or other driving element.

In this construction, the entire mechanism that makes up the tweeter moves in unison with the low frequency diaphragm within the confines of the piston and forms part of the total momentum of the low frequency driver. This configuration eliminates the commonly used mounting posts or plackets that support high frequency units and improves the overall frequency response, dispersion, time, and phase characteristics of the speaker system.

Accordingly, one object of the present invention is to provide an improved multi-dry loudspeaker structure with improved overall frequency response, dispersion, time and phase characteristics.

Another object of the present invention is to provide an improved multi-driver speaker structure that does not require separate mounting arrangements for central or bidirectional frequency drive units.

These and other objects of the present invention will become readily apparent to those skilled in the art upon reading the following detailed description with reference to the accompanying drawings.

In the embodiment of the invention shown in FIG. 1, the low frequency transducer or woofer is of the permanent magnet, moving coil type and includes a permanent magnet assembly to which a generally slightly conical frame 12 is fixed. .

The frame 12 defines an opening 1'5 which collectively forms the front shape and area of the transducer. The shape of the opening 16 formed by the frame can be other than circular, for example, oval.

The woofer's diaphragm 14 as a whole projects outward in the shape of a circle C1t, and its outer edge is fixed to the frame 12 by means of a flexible hanging device 16. Inside, a voice coil 20 surrounding the center of the permanent magnet assembly 1 [22] is fixed in the lower part of the voice coil frame 1, and the voice coil is placed in a magnetic air gap 24 of normal shape. placed in Until this point, the t1/1 construction of the converter is entirely conventional.
+! It is +ri.

The high frequency converter or tweeter is a tweeter cone 30
In the winter, its central 1illll Haufa cone 14
is generally aligned with the solid axis of . tweeter cone 30
U, it has a slightly larger spread 9 than the woofer cone 14, and its dimensions are quite small. At the outer periphery of cone 30, a form compliance ring 34 may be placed between cone 30 and the surface of diaphragm 140.

Damping or reinforcing filters 2 and 36t extending behind the cone 3 and along part of its surface are provided to smooth the response and insulate the leads if necessary. Driver element 38 is placed at the apex of cone 30. The dry l<i> element 38 includes a piezoelectric crystal, commonly known commercially as a bimorph or multimorph.

Electrical lead 40 is coupled to crystal 68 and exits through woofer cone 14k to input terminal 4/I which is attached to a portion of frame 12 in a conventional manner.

Glue portion 40 from crystal 38 couples to 4)-dead 43 which connects terminal 44 to voice coil 20. Crystal 68 and voice coil/I/20 are thus electrically connected in parallel.

Both Dofipa 3 without using crossover network
A pair of input leads can be connected to 8 and 20 because the crystal driver 8 acts as a quality range filter and tweeter driver and also depends on the thickness, coupling coefficient and diameter of the crystal and the cone 30. This is because, depending on its diameter and its shape, it provides an effective overpass frequency anywhere within the range of 1 to 10 horses. External filter networks can be used if desired.

Damping rings, 2 and 66, made of fiberglass insulating material as shown, suppress undesirable vibrational modes while suppressing undesirable vibrational modes.
Link 34 +, J, provides a means of controlling the mechanical coupling between the woofer and tweeter cone 14°50 in the response range 1 super region -0, thus providing the desired M
The tube response depends on the tweeter mechanism's material, dimensions, symmetry,
and by appropriate selection of position and variation of decoupling ring 54 and damping rings 62 and 36. The tweeter cone 30 can be suspended in front of the TE'7-7a cone in several ways.

The circumference of the tweeter cone 3 can be attached directly to the woofer cone or via a flexible member. Tweeter cone 3o supports tweeter cone 60 from its crystal driver 38 and connects crystal driver 58 to woofer voice coil form 1.
8 or directly at the apex of the woofer cone, without making structural contact between the cones.
It can be hung in front of the woofer cone.

Tweeter cone 60 may be mounted at any suitable location on the body of woofer cone 140 to provide wide angle dispersion.

When operated in response to a low frequency electrical signal, the transducer assembly becomes just like a piston. Actuation according to frequencies higher than the chronoover frequency (ri) is not possible in nature, unless the high-frequency cone 6'O is actually mounted on a support that exhibits little or no movement at these high frequencies. The decoupling device placed between the woofer cone 14 and the tweeter cone 60 contributes to the movement of the two cones in the midband and upper band response regions and It provides a method for controlling the culmivity of the phase, and thus provides a means for controlling the electromechanical feedback to the tweeter drive element, as explained by the correlation principle. This mounting between the diaphragms 14.3 and 14.3 () leads to an improvement in the overall frequency response and dispersion, and provides smooth frequency response characteristics. From a mechanical point of view, the device of the present invention has an auxiliary support commonly used in other coaxial devices to support high frequency drivers;
Eliminates the need for a single bracket.

Another embodiment of the invention shown in FIGS. 2 and 6?
In Example J, permanent magnet set)'r body 11 ['l),
6 in x 9 in (15.24cm x 22.
It is encircled by a frame 112 having a generally oval or oblong front opening, shown at 86c:m). The woofer diaphragm 114 is entirely
It looks outward in a shape.

The external rim of the diaphragm 114 is L, a flexible suspension J=1.
, 116 to the oblong front opening of the frame 112. The flS of the diaphragm 114 is placed in the magnetic gap 124 in a normal manner.
Voice coil frame 1 installed on '120
It is fixed at 18.

The tweeter of this embodiment has a tweeter cone 130 whose solid axis is offset approximately 45 DEG 1111 from the axis of the transmission cone 114 best shown in FIG. A bonding area 131 is provided at the outer periphery of cone 130. This junction area 131 is connected to the woofer cone 114
Open D1. ', 3 may be glued or otherwise attached to the outer circumferential edge 135 of 3, with or without a pliable member. A piezoelectric bimorph crystal driver element 168 is placed at the apex of cone 16().

Electrical leads 140 are connected to crystal 138 and extend to terminals 145 provided on the outer surface of woofer cone 114. Glue 1A from crystal 138 (] &, j, ,
A lead 142 connects to an input terminal 144 provided on the support frame 112 . Also, the lead 142 connects the terminal 144 to the woofer voice coil/l/1.
Connected to 20. Woofer voice koi/l/1
20 and tweeter driver 138 are previously connected in parallel.

Again, a pair of human leads 142 can be connected to both 1' without using a divider or crossover network.
Crystals 1-
This is because Lime 16B acts as an IRI band filter.

In another embodiment of the invention shown in FIG. 4 12, a permanent magnet assembly r (not shown) is fixed to a frame 212 having a generally circular Mff opening 1j. The tweeter I-7230 can be formed into the woofer cone body 214 so that the peripheral portion of the woofer cone 7214 is an extension of the tweeter cone body. The woofer diaphragm 214 expands outward in the shape of a circle 01E as a whole.

Its outer periphery is fixed to the circular Ftf7 opening formed by the frame 212KA@. The internal voice coil form of the diaphragm 214 is secured to the internal voice coil form, but all the voice coils included therein have been previously exposed and surrounded in a similar manner to the central pole of the permanent magnet assembly and placed in an air space. placed.

Four high frequency transducers or tweeters 229 are mounted to the woofer diaphragm 214 in a manner similar to the tweeter diaphragm mounting shown in FIG. Each tweeter 229
includes a tweeter cone 260 whose solid shaft 1.1
As in the embodiment of FIGS. 2 and 3, it is offset 45 degrees from the solid axis of woofer cone 214. Also, the axes of the tweeter two are placed every 90 degrees around the axis of the woofer cone 214. As previously discussed, tweeter cone 230 has a slightly larger extent than woofer cone 214 and is much smaller in size.

A piezoelectric driver element (not shown) is placed at the apex of each cone 230. The crystal electrical termination (not shown) driving tweeter cone 230 is made similar to the previous embodiment.

Again, the crystal driver acts as a high pass filter, and the frequency response of the driver is selectable in part by appropriate selection of the physical parameters of the various drivers and tweeter cone 230.

The advantages of separating the tweeter axis from the woofer axis in the embodiments of FIGS. 1 through 4 are best understood by referring to FIGS. 5 through 7 (11).

FIG. 5 IJ, [Prior art 6 rivers x 9 ir+ (15,2
4 cm x 22 x 36 r m) oval speaker frequency response is shown. The six frequency response curves are the sub-coaxial (0”) Ml wave number and 7-bons, speaker J70'@axis frequency response, and sub-cano 4'
)'' off-axis frequency response. ).At about 4KIly, the off-axis performance decreases tiffL, <
'fzle'(3o'Jllll is about 5dB, 45'' off-axis is reduced by 14dB). 15KIIzte is 30' off-axis is reduced by 13dB, and 45°nE axis is about the same reduction.

Figure 6 shows the 6#x9'' (1
5.24 cm x 22.86 cm) shows the frequency response of an oblong speaker. The off-axis response at 2 KHz is reduced by approximately 1 and 3d13 (3(1' off-axis position 45°m 1Fltl te) K (Mk
Rel y5c,! , Krl+:, the off-axis response at 60° does not decrease by about 1~L5 dT317, and is improved by 5.5~4 dB than in Fig. 5; It is improved by 5.5 to 6d13 compared to FIG. 5 without any decrease.

15 In the K11z, the improvement is equally significant (~<, the off-axis response of the mouth o0 is about 10.5 dBl, but there is no decrease,
It is an improvement of 2.5d13 compared to the figure, but the 45° Nt axis lever does not decrease by a5dBl, and is 5.5dBl better than the figure 5.
This is an improvement on rlB.

The frequency response characteristics of the embodiments of FIGS. 2 and 6 of the present invention are shown in FIG. In the embodiment tested with respect to FIG. 7, the apex of the tweeter cone, which projects into the surface of the surrounding woofer cone, is on its way from the woofer cone axis to the compliance ring. It is attached away from the woofer cone on the way from the woofer cone axis to the compliance ring. 2 KH2, the 30° 111F axis response showed a decrease of about 1.5 to 2d13, and the 45° #
Axial response shows a decrease of about 5 C11-3. 4KH
z, 50° off-axis performance tit is actually 1 to 1 better than coaxial performance.
．． 5dlJi1%(,45°1111111m gender AU
t-j: only about 1.5-2 dB below the coaxial performance, both of which are significant improvements over the embodiment of FIG. 15K
1-12, both the Ro'l II axis performance and the 45° fs axis performance are actually much higher than the coaxial performance, and the 30°
is approximately 4 to 5 dB higher than the coaxial performance, and at 45° the coaxial 1
The performance rise is approximately 10dB higher.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a multi-domain speaker device made according to the present invention, FIG. 2 is a front view of a multi-domain speaker device made according to the present invention, and FIG. The second section taken generally along line 6-3 of the device.
FIG. 4 is a front view of a multi-double speaker device made according to the present invention, and FIGS.
The figures show the frequency response characteristics of a prior art loudspeaker and two loudspeakers made according to the present invention.

Claims (1)

[Claims] (1) A first transducer of the dynamic radiator type configured to reproduce sound in the lower part of the iTI audio frequency range and a first transducer of the dynamic radiator type configured to reproduce sound in the upper part of the audio frequency range. a second transducer fabricated, the radiator comprising a diaphragm, and the second transducer disposed within the periphery of the diaphragm and mounted above the first diaphragm. A multi-driver speaker device characterized in that it can move together with the multi-driver speaker device. (2) The speaker device according to claim 1, wherein the second transducer includes a driving device having a piezoelectric crystal. (3) Each of the transducers includes a separate drive, the drive for the first transducer being a J-coil, permanent magnet type, and the drive for the second transducer being of the piezoelectric type. A speaker device according to claim 1, characterized in that: (4) The speaker assembly R8 according to claim 6, wherein the second transducer is supported on the first transducer by an intermediate joint device. (5) The second transducer is 7. The speaker device according to claim 6, wherein the speaker device is mounted non-concentrically with respect to the first transducer. (6) The speaker device according to claim 1, wherein the second transducer is mounted non-concentrically with respect to the first transducer. 7. A seven-beaker installation according to claim 6, wherein said second converter is supported above said first converter by an intermediate coupling arrangement. 8. A speaker device according to claim 1, wherein the first transducer includes the second transducer as an integral part, the second transducer being driven separately. (9) The speaker device according to claim 8, wherein the second transducer is placed non-concentrically with respect to the first transducer. Each of the transducers includes a separate drive device, the drive device d of the first transducer is of the moving coil, permanent magnet type, and the drive device of the second transducer is of the piezoelectric type. The speaker device according to claim 9. (11) A first transducer of the dilimic fugiator type constructed to reproduce sound in the 1,000-sided part of the audible frequency range; a plurality of second transducers 17, the radiator comprising a diaphragm, and the second transducer being disposed within the periphery of the diaphragm and mounted above the first transducer; A multi-driver speaker device characterized by being able to move in unison with one digit and one thousand digits. Claim 1, characterized in that the second converter of a is attached to the first converter of ThQ.
The speaker device Ft according to item 1. 03 The second converter is connected to the first converter by an intermediate joint device.
13. The speaker device according to claim 12, wherein the speaker device is supported on a transducer. 04) Each of the transducers includes a separate drive, the drive of the first father transducer being of the moving coil, permanent magnet type, and the drive of at least one of the second transducers being of the piezoelectric type. A speaker device according to claim 12, characterized in that: 15. A loudspeaker device according to claim 11, wherein the first transducer includes the second transducer as an integral part, and the second transducer is separately driven. Oe A loudspeaker device according to claim 15, characterized in that the second transducer is placed non-concentrically with respect to the first transducer. Each of the transducers includes a separate drive, the drive for the first transducer being of the moving coil, permanent magnet type, and the drive for at least one of the second transducers d being of the piezoelectric type. A speaker device 0 according to claim 16, characterized in that: