JPS5854718B2 - speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker that can provide stereophonic reproduced sound and a sound field in which the original sound is reproduced in harmony and with high fidelity at any listening position using only one speaker system.

In general, there are various types of speakers, such as cone-type speakers and flat-plate speakers installed in sealed enclosures or bass reflex enclosures. A pair of 3D speakers are placed on each side, and the listener listens to the blended sounds from the left and right sides passing through the space at a predetermined distance.

Therefore, it is generally said that it is best to listen to the reproduced sound near the apex of an equilateral triangle with the two left and right speakers as the base; if the listening position is bad, the left and right sound will be unbalanced and the stereophonic effect will be impaired. There are drawbacks.

In addition, in the case of cone-shaped speakers installed in conventional sealed enclosures or bass reflex enclosures, the speaker is attached to the front baffle plate, so the vibration of the speaker's diaphragm and drive unit is transmitted to the frame of the speaker. The vibration of the speaker's diaphragm compresses the air at the rear of the speaker, and this air pressure presses the enclosure wall and vibrates, and these enclosure vibrations cause speaker vibration. This has the disadvantage that the acoustic characteristics of the enclosure interfere with the vibration of the board, which affects the sound production, making it impossible to reproduce the original sound with high fidelity.

In addition, flat speakers have poor frequency characteristics,
As the frequency increases, split vibrations occur and distortion occurs, making it impossible to reproduce the original sound with high fidelity.

This invention was made in view of the above circumstances, and provides a harmonious stereophonic reproduction sound and sound field at any listening position with only one speaker system, and also reproduces the original sound with high fidelity. The purpose is to provide a speaker that can.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a rectangular support plate, and a circular hole 2 is formed approximately in the center of the support plate 1.

Further, a frame body 3 made of a thin plate is attached to the support plate 1 to constitute a thin enclosure 4.

A flange-shaped portion 5 is formed in the frame 3 and is bent inward.

Legs 6 are provided at the bottom of the frame 3.

Also, from the support plate 1, there is a slight difference (approximately 10
A diaphragm 7 is opposed to the support plate 1 in parallel with a distance of 0 mm) from the diaphragm 7.

The diaphragm 7 is made of a synthetic resin material such as styrofoam or styrene, and is lightweight and has a length of 1200 to 1350 ml, for example.
It has a rectangular shape of 00 to 660 mm, and has an extremely small area ratio to the surface area of the enclosure 4, and its peripheral edge is connected to the brim of the frame 3 by an elastic connecting member 8 with a U-shaped cross section. 5.

Furthermore, pleats 9 are provided at approximately three equal parts in the left and right direction of the diaphragm 7.
is provided.

This pleated portion 9 has a plurality of grooves alternately arranged on the front and back surfaces of the diaphragm 7 (in this embodiment,
Four are formed on the inner surface and the back surface.

) 10 are formed, and the width and depth of these grooves 10 are gradually narrower or shallower from those located on the left and right ends of the diaphragm 7 to those located on the center side.

Therefore, the diaphragm 7 has a central diaphragm section 11 and outer diaphragm sections 1 on both sides of the central diaphragm section 11 by the folds 9, 9.
It is divided into three parts: 2.12.

A hole 14 having a diameter slightly larger than the outer diameter of a tweeter 13, which will be described later, is formed approximately at the center of both outer diaphragm portions 12.12.

Further, a woofer magnet 15 with a yoke is attached to a substantially central portion of the support plate 1 via a frame 16.

At the center of the woofer magnet 15 is a center ball (
(not shown), and a bobbin 17 on which a moving coil for a woofer is wound is fitted into this center ball so as to be movable in the direction of its axial force.

That is, a woofer having a structure similar to that of a commercially available cone-type woofer with the cone (diaphragm) removed is attached to the substantially central portion of the support plate 1.

A pipe 18 is connected to the bobbin 17 on an extension of its axis.

The end of the pipe 18 on the side of the diaphragm 7 is formed into a tapered shape and is attached to a substantially central portion of the central diaphragm section 11 .

Thereby, a woofer 19 having a central diaphragm portion 11 is configured.

In addition, the same squawker magnets 2 are placed at eight predetermined locations on the support plate 1 corresponding to the outer diaphragm portions 12, 12.
0 is attached.

A bobbin 21 wound with a squawker moving coil is fitted into the center ball of the squawker magnet 20 so as to be movable in the axial direction thereof.

That is, eight parts of the support plate 1 are attached with structures similar to those of a commercially available cone-type squawker with the cone removed.

A pipe 22 is connected to the bobbin 21 on an extension of its axis.

The end of this pipe 22 on the side of the diaphragm 7 is formed into a tapered shape and is attached to four predetermined locations on each of the outer diaphragm sections 12 and 12.

As a result, a squawker 23 having an outer diaphragm portion 12 is configured.

Further, a columnar mounting member 24 is attached to a portion of the support plate 1 that corresponds to the hole 14 .

The tweeter 13 is attached to the end of the columnar mounting member 24 on the diaphragm 7 side.
14 of the holes are exposed.

Next, the operation of the speaker configured as described above will be explained.

First, input the low frequency component of the sum signal of the right channel and left channel of the output amplifier (not shown) to the moving coil for the woofer, and input the low frequency component of the sum signal of the right channel and left channel of the output amplifier to each moving coil for the right squawker. In addition to inputting the mid-range component of the signal, the mid-range component of the left channel signal of the output amplifier is input to each moving coil for the left squawker, and furthermore, the mid-range component of the signal of the left channel of the output amplifier is input to the moving coil of the right tweeter 13. The high frequency component of the right channel signal is input, and the high frequency component of the left channel signal of the output amplifier is input to the moving coil of the left tweeter 13.

Then, the diaphragm 7 vibrates, but the width and depth of the grooves 10 in the pleats 9 gradually narrow or become narrower from those located at the left and right ends of the diaphragm 7 to those located at the center, as described above. Because it is formed shallowly, the low-frequency vibration of the central diaphragm section 11 easily spreads to the outer diaphragm sections 12, 12, but the frequency is higher than that of the central diaphragm section 11 occurring at the outer diaphragm sections 12.12. Frequency vibrations are difficult to spread to the central diaphragm section 11.

Further, as described above, the tweeter 13 is provided independently on the left and right sides of the diaphragm 7, and the tweeter 13
The directional reproduced sound passes through the hole 14 of the diaphragm 7 and is emitted toward the front.

Therefore, the mid-range component of the reproduced sound due to the vibration of the diaphragm 7 maintains separation between the left and right sides even though the structure is such that a single diaphragm 7 vibrates to generate sound, and the low-frequency component of the reproduced sound
Sound can be generated from the entire diaphragm 7, and this low frequency component is generally omnidirectional and has almost no effect on the stereo effect even if it is not separated into left and right, and the high frequency component of the reproduced sound is generated by the tweeter 13.13. The left and right parts produce sound independently, and since this high-frequency component is directional, the left and right parts can be easily separated.For these reasons, the speaker of this embodiment uses a single speaker system (integrated speaker system). ), it can still fully demonstrate the stereophonic effect.

In addition, although the high-frequency and mid-range components of the reproduced sound are separated in one speaker system of this embodiment, these are produced from one speaker system as a sound source, so you can use it from any listening position. A harmonious stereophonic reproduction sound and sound field can be obtained from almost any listening position.

In addition, the ratio of the area of the diaphragm 7 to the surface area of the enclosure 4 surrounding the diaphragm 7 is the ratio of the area of the diaphragm to the surface area of the enclosure surrounding the diaphragm in a conventional closed-type speaker or palace flex speaker. In addition, in the speaker of this embodiment, what is on the front is the diaphragm 7 rather than the baffle, and the woofer magnet 15, the squawker magnet 20, which is the driving part of this diaphragm 7, and each Since the woofer and squawker moving coils are attached to the support plate 1, the amount of vibration of the diaphragm 7 transmitted to the enclosure 4 via the woofer magnet 15, frame 16, squawker magnet 20, etc. is extremely small. The air between the diaphragm T and the support plate 1 is slightly compressed by the vibration of the diaphragm 1, but since the distance between the diaphragm 7 and the support plate 1 is small (approximately 100 mm), this air is compressed slightly. The compression is not like in conventional sealed enclosures or bass reflex enclosures, where the compression pressure is strong and causes sound waves with different phases to be generated, but it merely acts as a damper for the diaphragm 7. The interference between the vibration of the diaphragm 7 and the enclosure 4 is extremely small, and in the conventional closed-type speaker or bass reflex type speaker as described above, the vibration of the diaphragm of the speaker and the vibration of the enclosure induced by this vibration are extremely small. The acoustic characteristics of the enclosure, such as the occurrence of large interference between the speaker and the diaphragm, hardly affect the sound production, and with the speaker of this embodiment, the pure sound produced by the sounding body (diaphragm) can be directly heard.

Further, since the diaphragm 7 is made of a lightweight synthetic resin material such as styrofoam or styrene, it has good followability with respect to the movement of the moving coil for the woofer or the squawker, and moreover, the diaphragm 7 has a good ability to follow the movement of the moving coil for the woofer or the squawker. Since four identical squawker moving coils are installed at predetermined locations, no split vibration occurs, and the connecting member 8 on the periphery of the diaphragm 7 is formed with a U-shaped cross section, and is capable of transmitting sound waves. Since the installation is done in such a way that it is difficult for this to occur, like the edge of the diaphragm of a conventional cone-type speaker, this part causes resonance with other parts and deteriorates the transient characteristics. There is no dip in the mids.

Furthermore, in the speaker of this embodiment, the total area of the left and right outer diaphragm sections 12 and 12 that constitute the squawker is twice the area of the central diaphragm section 11 that constitutes the woofer. , the ratio is much higher than that of a bass reflex type speaker, and it goes without saying that this ratio is enormous for a tweeter, so the reproduction sound pressure in the midrange is extremely high, and this midrange reproduction sound is the main one. This results in a state in which low and high range playback sounds are added, and the midrange playback sound is reproduced effortlessly, and the midrange playback sound becomes sharper like a conventional closed speaker or bass reflex speaker. , the listener will not feel that the midrange reproduction sound is hard.

In general, the nature of a sound that is pleasant to listen to is not based on sharpness or hardness, but rather on things that can be described as sweetness, softness, plump sound, and richness, and these have a lot of midrange components. It has been known.

As described above, the speaker of this embodiment is constructed to be able to sufficiently reproduce the components of this midrange range, so that particularly pleasant musical sounds can be heard.

As explained above, the present invention makes the area ratio between the surface area of one diaphragm and the enclosure extremely small, and also provides pleats at predetermined locations on the diaphragm to separate the woofer section and the squawker sections on both sides thereof. Since the woofer is divided into at least three sections, and tweeters are installed independently on both sides of the woofer section, harmonious stereophonic reproduction sound can be achieved at any listening position using only one speaker system. A sound field can be obtained and the original sound can be reproduced with high fidelity.

Furthermore, since the speaker of the present invention is a kind of screen-type speaker and has folds, it is suitable for both Japanese and Western rooms.
It also has an excellent design as an interior decoration item.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a cross-sectional plan view taken along the line ■-■ in FIG. 1, and FIG.
FIG. 4 is an enlarged plan view of the inside of FIG. 2. 1... Support plate, 3... Frame, 4...
...Enclosure 7...Diaphragm, 8.
...Connecting member, 9...Fold portion, 11...
... Central diaphragm section, 12 ... Outer diaphragm section, 13 ... Teater, 15 ... Woofer magnet, 19 ... Woofer, 20...
... Squawka magnet, 23...Squawka.

Claims (1)

[Claims] 1. A thin enclosure is constructed by attaching a frame to a support plate, and a diaphragm made of a single lightweight member with an extremely small area ratio to the surface area of the enclosure is mounted on the support plate and slightly spaced from the support plate. The peripheral edge of the diaphragm is elastically attached to the enclosure via an elastic member, and a plurality of folds are provided at predetermined locations on the diaphragm so that at least the center diaphragm part and the outer diaphragm part are separated. A bobbin of a woofer moving coil divided into three parts and fitted to a center ball of a woofer magnet attached to the support plate is connected to the central diaphragm part to form a part of the woofer; A squawker section is configured by connecting bobbins of squawker moving coils fitted to center balls of a plurality of squawker magnets attached to a plate to the outer diaphragm section, respectively;
The speaker further comprises tweeters located in the vicinity of the outer diaphragm portion and independently provided therein.