JPS5928796A - Speaker - Google Patents

Abstract

PURPOSE:To simplify a constitution and to attain an economy, by forming almost the same construction as that of a cone speaker and fixing a flat diaphragm on an opening of the cone. CONSTITUTION:A magnetic circuit is formed with a top plate 1, a bottom plate 2 and a ring shaped magnet 3, and a frame 4 is fixed to the plate 1. A damper 5 is fixed to the frame 4, and a coil bobbin 7 is supported in a gap of the magnetic circuit with the damper 5. The construction almost the same as that of a cone speaker is formed and the flat diaphragm 11 is fixed to the opening of the cone 8. When an input signal is applied to the speaker of this constitution, a driving force produced in a voice coil 6 vibrates a diaphragm 11 via a bobbin 7 and the cone 8, allowing to reproduce sound pressure. Further, it is desirable to fix a reinforced cone 17 to the diaphragm 11 and the bobbin 7 in this constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker having a flat diaphragm that is easy to manufacture.

When manufacturing a flat speaker, conventionally, the back side of a flat diaphragm is fixed to the tip of a voice coil bobbin supported by a damper, and the entire peripheral edge of the flat diaphragm is held in a frame, or a drive cord/coat is attached to the voice coil bobbin. When attaching a flat diaphragm to the drive cone, the periphery of the diaphragm is held by an edge on the frame and then inserted into the magnetic circuit. Because they are carried out simultaneously, positioning is difficult, which often results in defective products.Although various manufacturing methods have been proposed to improve this problem, there are only a few that yield complicated and economical VC.

The present invention is a speaker that improves such drawbacks and has a structure that is almost the same as that of a conventional cone-type speaker, in which a flat diaphragm is fixed to the opening surface of the cone, and the structure is simple and economical. This is what can be obtained.

In FIG. 1, a normal dynamic speaker is shown, and a magnetic circuit is formed by a top plate (1), a bottom plate (2) and a ring-shaped magnet (3), and a frame (4) is attached to the top plate. ) to be fixed. A damper (5) is fixed to the frame, and the damper causes a voice coil bobbin (6) having a voice coil (6).
7) C. Supported within the gap of the magnetic circuit. One end of the cone (8) is fixed to the voice coil bobbin, and the opening/end periphery of the cone is attached to the frame via the edge (9).
Install. The edges are formed in a U-shaped or Ω-shape as appropriate.

In this way, a cone-shaped speaker having a structure substantially similar to that of a cone-shaped speaker can be manufactured using substantially the same manufacturing method as a conventional cone-shaped speaker. The planar diaphragm (r+) is made of a metal honeycomb core with a thin metal skin material attached to the outer surface, a paper or plastic honeycomb core with a thin paper or plastic notebook attached to the surface, or other light and strong materials. In the structure shown in FIGS. 1 to 4, the periphery of the front adhesive piece α extends further than the periphery of the rear adhesive piece 04), and the extending portion is entirely connected to the above-mentioned cone. (8
) is fixed to the opening surface with adhesive, etc. The cone, plane diaphragm, and edge can be connected in various ways, and the one shown in FIG. , an extension 04) of a diaphragm 01) formed to have approximately the same length as the side piece is fixed to the front surface of the side piece. The one shown in FIG.
0 is fixed to the front surface of the side piece 0 of the edge, and the extension part (14) of the diaphragm is completely fixed to the opening edge of the cone, and the one shown in Fig. 7 is the piece (13) attached to the rear side of the diaphragm. k It is fixed to the edge of the opening. Figures S and 3 show examples in which the cone is attached to the side piece of an Ω-shaped edge. The extension part 04) of the front side adhesive piece of the diaphragm is fixed to the edge, and the one shown in FIG. 3 is the one in which the back side of the diaphragm is directly fixed to the opening edge of the cone without providing an extension part.

When an input signal is applied to the speaker, the driving force generated in the voice coil causes the entire width of the diaphragm connected to the voice coil bobbin via the cone to reproduce sound pressure.

If the flat diaphragm is relatively thin, it may warp or sag during vibration, causing squealing or distorted sounds, and if it is relatively thick and heavy, it will be inefficient. Transient characteristics also deteriorate. Further, if bobbin flC partial resonance occurs, it is unfavorable for sound reproduction. Therefore, the diaphragm is preferably provided with reinforcing means.

What is shown in FIGS. 1 and 7 is provided with a reinforcing cone as a reinforcing means, the reinforcing cone θ is located inside the cone σ], and one end (1, 8)' is connected to the plane vibration. It is fixed to the back surface of the plate θ1), and the other end θO is fixed to the voice coil bobbin (7).

The reinforcing cone may be fixed in advance with the center axis aligned with the back surface of the flat diaphragm, and the center neck portion may be inserted and fixed later using the bobbin as a guide, or it may be fixed in place approximately like the cone type speaker described above. When manufacturing something with a similar structure, it may be fixed to the voice coil bobbin like a double cone speaker and later fixed to the diaphragm, and the number of speakers may be two or more. (Figure 7). By appropriately selecting the supporting position of the reinforcing cone according to the surface area of the planar diaphragm, the driving force from the voice coil can be distributed in a distributed manner, thereby suppressing partial resonance of the diaphragm. Since it can be made thinner, it is possible to obtain flat characteristics without peaks or dips without causing a decrease in efficiency.

What is shown in FIG. (
7) has a hole with an inner diameter that fits into it, and is preferably made of a light and strong material such as a metal honeycomb core with a thin metal skin material attached to the surface, and is coaxially fixed to the back surface of the flat diaphragm in advance. , and fit into the extension of the voice coil bobbin (7). Divided by this, the thickness of the plane diaphragm k'I, and the thickness of the reinforcing ring'
f1:t2, 'a' to the length of the extended voice coil bobbin
When 'i>'z> 1. The cone can be omitted by appropriately selecting the outer diameter and thickness of the reinforcing ring. By doing the above, the reinforcing ring suppresses the partial resonance of the extended voice coil bobbin itself, while at the same time ensuring that the bobbin is correctly supported by the plane diaphragm, and correctly transmitting the driving force of the voice coil to the plane diaphragm. Good sound reproduction can be achieved.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, with Figure 1 being a sectional view and Figure 2 being a sectional view.
6 to 6 are partially enlarged sectional views, and FIGS. 7 and g are sectional views of other embodiments.

Claims (1)

[Claims] / A speaker in which one end of a cone is fixed to a voice coil bobbin, and the periphery of the opening end of the cone is attached to a frame via an edge, and a flat diaphragm is fixed to the opening surface of the cone. A speaker in which one end of a λ cone is fixed to a voice coil bobbin, a flat diaphragm is fixed to the opening surface of the cone, and a flat diaphragm is fixed to the opening surface of the cone, and reinforcing means for reinforcing the diaphragm is provided. 3. The speaker according to claim Ω, wherein the reinforcing means is a reinforcing cone having one end fixed to the back surface of the flat diaphragm and the other end fixed to the voice coil bobbin inside the cone. 3. The speaker according to claim 2, wherein the voice coil bobbin has a length that reaches the flat diaphragm, and the reinforcing means is a reinforcing ring fixed around the tip of the voice coil bobbin and to the back surface of the flat diaphragm.