JPH0238554Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a composite type that is capable of reproducing sound over a wide range from bass to treble by disposing multiple diaphragms with different sound ranges on the same axis. The present invention relates to a speaker, and particularly to a composite speaker that can be easily made thin.

[Conventional technology]

Conventionally, this type of composite speaker, especially a mechanical two-way speaker, has been developed, for example, in 1983-
It had the configuration disclosed in Publication No. 149799.

Therefore, the conventional technique disclosed in the above-mentioned publication will be explained based on FIG. 7.

Reference numeral 1 designates a flat diaphragm for bass sounds. This diaphragm 1 has a sandwich structure in which skin materials 12 and 13 are bonded to the upper and lower surfaces of a core 11, and the core 11 is made of honeycomb, hard foamed resin, or the like. 2 is a cone-shaped diaphragm for high-pitched sounds arranged coaxially with the flat diaphragm 1; 3 is an edge connecting the flat diaphragm 1 and the cone-shaped diaphragm 2; and 4 is a center cap.
Here, the cone-shaped diaphragm 2, the edge 3, the center cap 4, and the upper skin material 12 constituting the planar diaphragm 1 are integrally formed. The skin material 12 is made of a highly ductile material such as aluminum or resin film in order to make the cone-shaped diaphragm 2 for high-pitched sounds thin and light and to facilitate squeezing. Further, the lower skin material 4 is made of a material with excellent strength such as duralumin or reinforced fiber plastic. or,
The thickness of the cone-shaped diaphragm 2, edge 3, and center cap 4 that are integrally formed is relatively thin.

5 is a cone for driving the flat diaphragm 1 which is arranged coaxially with the flat diaphragm 1; 6 is a bobbin around which the voice coil 7 is wound; 8 is a magnetic cone consisting of a magnet 81, a top plate 82, and a yoke 83. circuit,
9 is a frame, 10a is an edge, and 10b is a damper.

Next, to explain the assembly, first, the outer peripheral edge of the skin material 12 on the upper surface of the flat diaphragm 1 is fixed to the frame 9 via the edge 10a, and the outer peripheral edge of the driving cone 5 is fixed to the skin material 13 on the lower surface. stick. Further, a bobbin 6 is fixed to the top of the cone-shaped diaphragm 2 and the driving cone 5, which are arranged coaxially, and the bobbin 6 is connected to the frame 9 via the damper 10b, so that the voice coil 7 is connected to the top player 82. It is placed in a magnetic gap formed by the yoke 83.

Therefore, when an audio current is applied to the voice coil 7 as described above, the voice coil 7 vibrates in accordance with the audio current, causing the cone-shaped diaphragm 2 for high-pitched sounds to vibrate via the bobbin 6, and the driving cone 2 The flat diaphragm 1 for bass sounds vibrates through the vibration.

In recent years, speakers installed in household electrical equipment, vehicles, etc. are required to be thinner due to limited installation space.In the conventional composite speaker described above, the height of the driving cone has been reduced as much as possible. It served its purpose by having a low structure.

However, in the configuration of the conventional composite speaker, when the height of the driving cone 5 is reduced, the half-apex angle formed by the wall surface of the driving cone 5 and the side wall surface of the bobbin 6 increases, and the driving cone The stiffness of the base portion attached to the bobbin 6 of 5 is reduced,
Deterioration of speaker characteristics was unavoidable.

[Problems that this invention attempts to solve]

The present invention was devised to solve the above-mentioned conventional problems, and the purpose is to provide a composite speaker that is thinner and can obtain stable speaker characteristics over a wide frequency band. shall be.

[Means for solving problems]

The composite speaker according to the present invention is a composite speaker equipped with a plurality of coaxially arranged diaphragms with different sound ranges, and the outer peripheral end of the cone-shaped cone-shaped diaphragm for medium sounds joined to the bobbin. The present invention is characterized in that an adhesive stepped portion is provided around the periphery, and a flat diaphragm for bass sounds is adhered to the adhesive stepped portion.

[First embodiment]

A first embodiment of a composite speaker according to the present invention will be described with reference to FIGS. 1 to 5.

Components that are the same as those of the conventional composite speaker shown in FIG. 7 are given the same reference numbers.
The explanation will be omitted.

The composite speaker in this embodiment has a center cap 41 having a flat diaphragm 1 for bass sounds, a cone-shaped diaphragm 2 for mid-range sounds, and a sub-cone 41a for high sounds arranged coaxially from the outside. .

In addition to the conventional configuration, the planar diaphragm 1 may have a core 11 and skins 12, 13 made of lightweight resin films. Further, the outer shape is not limited to a circular shape, but may be an elliptical shape.

The cone-shaped diaphragm 2 has a substantially circular cylindrical shape, and has a vertical portion 21a at its outer peripheral end that is in the same direction as the vibration direction.
and a horizontal portion 21b perpendicular to the vertical portion 21a. The vertical portion 21a covers the circumferential portion 1a of the flat diaphragm 1, thereby improving the acoustic effect. Further, the horizontal portion 21b has a reinforcing groove 21 having a V-shaped cross section.
c is provided in an annular shape. As shown in FIG. 1 and FIG.
The inner circumferential portion 1a and the inner circumferential lower surface portion 13a are adhered with adhesive. Note that good speaker characteristics can be obtained by configuring the flat diaphragm 1 such that the nodes of the flat diaphragm 1 are located within the horizontal portion 21b. Furthermore, if the node of the flat diaphragm 1 is attached to the outermost peripheral end 21b' of the horizontal portion 21b, the best speaker characteristics can be obtained.

Further, when the planar diaphragm 1 is configured in an elliptical shape, the cone-shaped diaphragm 2 has a circular inner circumferential portion attached to the bobbin 6, and expands into an elliptical shape as it goes toward the outer circumference. If this configuration is adopted, the speaker characteristics of the bass region will be good.

Furthermore, as shown in FIGS. 1 and 3, the cone-shaped diaphragm 2 is provided with a hole 22 relatively close to the flat diaphragm 1, and a terminal 9 is provided on the frame 9.
1 through the hole 22, the voice coil 7 is inserted into the upper surface of the cone-shaped diaphragm 2.
After connecting the lead portion 71 with solder P, the connected portion is fixed to the cone-shaped diaphragm 2 with adhesive.

The joining structure between the center cap 41 and the bobbin 6 is as shown in FIG.
After coating, it is inserted into the bobbin 6 and fixed.

Next, the top plate 82 in the magnetic circuit 8
The inner peripheral part 82a of the yoke 83 is bent in the direction of the magnet 81, and the magnetic gap is positioned in the direction of the base plate 83a of the yoke 83.The composite speaker having the above structure has a flat diaphragm 1 disposed on the outside.
It is configured to be driven by a bobbin 6 via a cone-shaped diaphragm for medium sounds. In other words, the composite speaker of the present invention has a configuration in which a dedicated driving cone for driving the flat diaphragm 1 is not provided.

Therefore, it is possible to easily reduce the thickness of the speaker, and the speaker characteristics are the same as the fifth one.
As shown in the figure, speaker characteristics that are more stable than conventional products can be obtained over a wide range of frequency bands.

[Second example]

A second embodiment of the composite speaker according to the present invention will be described based on FIG. 6.

Note that the same parts as those shown in FIGS. 1 to 3 are designated by the same reference numerals, and their explanations will be omitted.

In the composite type speaker of this embodiment, the sub-cone 41a for high temperature in the first embodiment (see FIG. 1)
In order to eliminate this problem and make the center cap 42 double as a diaphragm for high-pitched sounds, a lightweight, hard, and thin material such as aluminum is used for the center cap 42, and the center cap 42 is formed into a dome shape.

[Effects of this invention]

As described in detail above, according to the present invention, it is possible to provide a composite speaker that has stable speaker characteristics over a wide range of frequency bands even if it is made thinner.

Therefore, it is possible to provide a composite speaker that can be mounted even in a place where the depth space of the mounting portion is small, and that is useful for household electrical equipment and vehicles.

Furthermore, the composite speaker of the present invention has a configuration in which a flat diaphragm for bass sounds is driven via a cone-shaped diaphragm for mid-range sounds, which has a stepped part attached to the outer periphery.
This eliminates the need for a driving cone to drive the flat diaphragm, reducing the number of parts and reducing the weight of the vibration system, resulting in better speaker characteristics, especially sound pressure characteristics, than conventional speakers. is obtained.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of a composite speaker according to the present invention, in which FIG. 1 is a sectional view, FIG. 2 is an enlarged sectional view of the main part, and FIG. 4 is an enlarged sectional view of section B in FIG. 1, FIG. 5 is a speaker characteristic diagram, and FIG.
The figure is a sectional view showing a second embodiment of the composite speaker according to the present invention, and FIG. 7 is a sectional view showing a conventional technique. 1... Plane diaphragm, 11... Core, 12, 13
...Skin material, 2...Cone-shaped diaphragm, 21...
Adhesive stepped portion, 21a...vertical portion, 21b...horizontal portion, 21c...reinforcement groove, 41, 42...center cap, 41a...subcone, 6...bobbin,
7...Voice coil, 8...Magnetic circuit, 9...Frame.

Claims (1)

[Scope of utility model registration request] In a composite speaker equipped with multiple diaphragms with different sound ranges arranged on the same axis, an adhesive step is provided around the outer peripheral edge of the cone-shaped diaphragm for mid-tones that is joined to the bobbin. . A composite speaker characterized in that a flat diaphragm for bass sounds is attached to the step of attachment.