JPH03132296A - Speaker - Google Patents

Abstract

PURPOSE:To attain piston motion of a diaphragm by integrally constituting two cabinets in which part of a rear side of the diaphragm is closed and the other part is opened and arranging the closed part and the opened part spreadingly and alternately. CONSTITUTION:An edge 13 is adhered endless around a rectangular part 17 surrounded by an outside of a reinforced frame and a frame and the part enclosed by the edge in the rear side of a diaphragm is a closed part. On the other hand, the remaining parts are opened parts and they are linked to an external space through a port 15 and both ends of reinforcement frame 12. Thus, the closed part 17 and the opened part are arranged alternately side by side. Thus, the amplitude of the diaphragm is nearly equal to both the closed part and the opened part and the diaphragm is in a motion close to a piston motion and the reliability at a large amplitude is especially improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker having a large-area flat diaphragm and a thin cabinet and capable of reproducing deep bass sounds.

BACKGROUND OF THE INVENTION With the recent development of AV equipment, large-screen clear images and high-quality sound reproduction are desired even in the home, and the equipment is becoming larger. Therefore, in order to save space in the listening room, thin wall-mounted speakers are suitable. In response to these demands, the inventors have already created a large-area flat diaphragm with a part of the back surface open and the other part sealed, making it possible to reproduce rich bass sounds in a thin cabinet. Applied for a speaker system (Patent Application Hei 1-2)
No. 1438). An example of the above-mentioned speaker will be described below with reference to the drawings.

FIG. 3(a) is a front view of the internal structure of the speaker system excluding the diaphragm, and FIG. 3(b) is a sectional view. In FIG. 3, 1 is a frame constructed by combining extruded aluminum materials, 2a and 2b are partition plates for dividing the inside of the cabinet into a sealed part and an open part, and 3 is a reinforcing beam for the frame. 16 voice coils 23 for driving the diaphragm
is inserted into the magnetic gap of the magnetic circuit 4 and placed at an optimal position to eliminate the low-order resonance mode of the diaphragm. An inner edge 7 and an outer edge 6 are attached between the outer periphery of the partition plate, the inner periphery of the frame, and the diaphragm, respectively. On the back surface of the diaphragm, the inner side of the partition plates 2a and 2b is a rear open portion 24a, which is connected to the external space via the port 5. Further, the other portion constitutes a sealed portion 25 by the back plate 22.

Since only the 0 and 7 parts on the back of the diaphragm are sealed cabinets and nets, the cabinet stiffness is smaller compared to the case where the entire diaphragm is sealed, and the lowest resonance frequency (f,) that determines the bass reproduction limit frequency is achieved. is low (this makes it possible to reproduce deep bass.Also, for the rear open section, opposite-phase sound is emitted from the port, but at the listening point, there is a phase difference between the sound emitted to the front of the diaphragm and the sound emitted from the front of the diaphragm. By placing the port near the center of the back of the cabinet,
Cancellation caused by out-of-phase sound can be reduced.

Furthermore, by dividing the partition plate into two parts, it is possible to disperse changes in the acoustic impedance on the rear surface of the diaphragm, which differ between the closed part and the open part, and realize a uniform amplitude distribution close to that of piston vibration.

Next, another conventional example will be explained with reference to FIG.

The content of this conventional example is disclosed in the specification of Japanese Patent Application No. 1-21438. Figure 4(a) is a front view showing the internal structure of the speaker system excluding the diaphragm;
b) is a cross-sectional view In the conventional example, the partition plate 2a,
2b is provided around the back side of the diaphragm, and the edge 41 in the center
The inside of the part surrounded by is the sealed part. The open portion is connected to the external space via a slit-shaped space 26 between the outer peripheral portion of the diaphragm and the frame 1. 27 is a sound-absorbing material to prevent resonance between open parts. In the conventional example, contrary to the first conventional example, the sealed part is configured in an island shape, so there is no need to paste the edges twice, reducing costs. I can figure it out.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) If a thick (sealed) portion is placed in the center of the diaphragm as in the second prior art example, it is difficult to cause the diaphragm to make piston movements due to the discontinuity of acoustic impedance on the back surface of the diaphragm.

(2) First. Both of the second conventional examples require a partition plate in addition to the vertical bars, and since the inner edges intersect with the vertical bars, the edges must also be pasted in the narrow space between the diaphragm and the vertical bars. The workability is poor.

(3) In the first conventional example, the open part is provided as an island G and is connected to the space on the back of the speaker via a port, so an outer edge is required to seal the other part. Increased man-hours.

The present invention solves the above-mentioned problems, makes the diaphragm move as a piston, and attaches the edges to greatly improve workability and reduce the number of parts by 54, thereby reducing costs.

Means for Solving the Problems In order to solve the above problems, the speaker of the present invention has a reinforcing bar for the partition plate lid that divides the space inside the cabinet, and a space between the back of the diaphragm and the reinforcing bar. It is an open part and has an edge structure that connects it to the external space through both ends of the reinforcing bar.

Effects According to the present invention, with the above-described configuration, first, the open portion and the sealed portion are distributed, so that changes in acoustic impedance on the back surface of the diaphragm are dispersed, and a uniform amplitude distribution close to that of piston vibration can be realized. In addition, the number of parts and man-hours were significantly reduced because the partition plates used to divide the space inside the cabinet also functioned as reinforcing bars for the frame. In addition, since the sealed part is configured in an island shape and the open part space is connected to the external space from both ends of the reinforcing bar, there is no need to attach the edges twice, improving work efficiency and reducing man-hours. It will be done.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. In FIG. 1, (a) is a front view showing the internal structure excluding the diaphragm, and Φ) is its xx' cross-sectional view. 11
is a frame constructed by combining extruded aluminum materials, 1
2 is a reinforcing crosspiece made of extruded aluminum material. Edges 13 are stuck endlessly around the rectangular part 17 surrounded by the outside of the reinforcing beam and the frame, and the part surrounded by the edges on the back side of the diaphragm becomes a sealed part. On the other hand, the remaining part is an open part and is connected to the external space through the port 15 and both ends of the reinforcing bar 12. As in the conventional example, the diaphragm is driven by 16 voice coils 23 placed at positions that eliminate low-order resonance modes. In this example, the voice coils and magnetic circuit support system (these are integrated) (hereinafter referred to as drivers) are all attached to reinforcing beams.

In the above configuration, first, since the sealed parts 17 and the open parts are arranged in an alternating manner, the amplitude of the diaphragm is almost equal in both the sealed parts and the open parts, and the vibration is similar to that of a piston, especially when the sound is loud. credibility has improved. In addition, compared to the case where a partition plate is provided separately from the reinforcing beam and edges are attached to the outer periphery of the partition plate and the outer periphery of the diaphragm, the number of parts and the number of assembly steps are reduced because the reinforcing beam and the partition plate are both used. . Moreover, compared to the case where the open part is provided in the form of an island, since both ends of the reinforcing bar 12 are connected to the space on the diaphragm side, there is no need to paste the edges twice, and the number of man-hours is significantly reduced. In addition, conventionally, ports were provided at six locations, but in this example, both ends of the reinforcing bar are open to the outside space, so only one port is provided at each location in the center of the reinforcing bar, for a total of four ports. We were able to obtain equivalent performance. Note that it is also possible to open the open space to the outside space only from both ends of the reinforcing bar and to provide no ports. In this case, efficiency decreases to some extent.

Next, a second embodiment of the present invention will be described with reference to the drawings. In Figure 2, (a) is a front view showing the internal structure, (
6) is its x-x' cross-sectional view, 12 is a reinforcing crosspiece, 13
is an edge, 15 is a port, and 14 is a driver. In this embodiment, contrary to the first embodiment, the driver is attached to the mounting plate 1.
8, and is attached between the reinforcing bars and between the reinforcing bars and the outer frame, that is, on the back surface of the sealing part 17. According to this embodiment, only three reinforcing bars are required, and there is no need to drill holes for attaching the driver to the reinforcing bars, thereby reducing costs. Furthermore, in the first embodiment, the bonded portion between the voice coil and the diaphragm was located inside the reinforcing crosspiece, so the state of bonding could not be visually confirmed, but in this embodiment, confirmation is easy. Note that it is also possible to provide an image projection screen on the surface of the diaphragm to create a screen-integrated speaker in which images and sound are integrated.

Effects of the Invention The present invention allows the reinforcing bar of the cabinet to also serve as a partition plate for dividing a space inside the cabinet, and also makes the space between the back of the diaphragm and the reinforcing bar an open part, so that the external space can be opened through both ends of the reinforcing bar. As a result, the following effects are obtained.

l) By alternately distributing closed parts and open parts,
The amplitude distribution of the diaphragm approaches piston motion, improving reliability.

2) Since the reinforcing bars are also used as partition plates for space division inside the cabinet, the number of parts is reduced, and compared to when the partition plates are provided separately from the reinforcing bars, the number of assembly steps is reduced, and the work efficiency when pasting edges is improved. improves.

3) Instead of an open part, a sealed part is provided in the form of an island, and the open part is connected not only to the port but also to the front through the outer circumference of the diaphragm from both ends of the reinforcing bar, eliminating the need to attach the edges twice. , the man-hours are significantly reduced.

and a cross-sectional view.

11... Frame, 12... Reinforcement crosspiece,
13... Edge 14... Driver, 1
5...Port, 16...Back plate, 17.
...Sealed part, 18...Mounting plate.

Claims (8)

[Claims] (1) Two cabinets are integrated, with a part of the back of the diaphragm being sealed and the other part being open, and the sealed and open parts are distributed and alternately arranged in at least two locations. Featured speakers. (2) The speaker according to claim (1), characterized in that at least one partition plate for dividing the inside of the cabinet into a sealed part and an open part also serves as a reinforcing crosspiece of the cabinet. (3) Claim (1) characterized in that the space of the open part is connected to the space in front of the speaker via the outer peripheral part of the diaphragm.
) or the speaker described in (2). (4) Claim (1) or (2) characterized in that the space in the open portion is connected to the space on the back of the cabinet via a port provided between the partition plate and the back plate of the cabinet. Speakers listed in. (5) The speaker according to any one of claims (1) to (4), characterized in that a driver for driving the diaphragm is attached to the partition plate. (6) Any one of claims (1) to (4), characterized in that the driver for driving the diaphragm is mounted across a plurality of partition plates, or across the partition plates and the outer peripheral frame of the cabinet. Speakers listed in. (7) The speaker according to any one of claims (1) to (4), characterized in that the driver is arranged at a position that eliminates a low-order resonance mode of the diaphragm. (8) The speaker according to any one of claims (1) to (4), characterized in that a screen for image projection is integrally provided on the surface of the diaphragm.