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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a portion of a speaker
diaphragm according to an embodiment of the present invention, and FIG. 2 is a perspective view
of a portion of another embodiment of the present invention. 1 ······· Heart material, 2, 2 ′ · · · · · ·
Surface material, 3, 3 · · · · · · Aluminum foil (reinforcing thin plate), 4 · · · · · · · · · Aluminum foil
(reinforcement Thin sheet), 5 · · · · · · · · · Rod body.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm formed by bonding a surface material to a rectangular flat-plate-shaped core material
surface q) 2 made of foam, and knee; The speaker diaphragm is provided. With the recent start of
audio multiplex broadcasting-speakers are provided on the left and right of the television
receiver. If a speaker of the original type is used as a speaker of such an audio multiplex
television, the speaker parts provided on the left and right of the cathode ray tube become large
9 and the television receiver becomes large. For this reason, conventionally, an elliptical speaker
using a paper cone has been used as a speaker for audio multiplex television-but in this elliptical
speaker, the rigidity of the diaphragm is low and one division vibration occurs to generate one
sound pressure frequency characteristic And there is a drawback that the reproduction band is
narrow and the sound quality is bad. In general, as a diaphragm material for expanding the
reproduction zone (piston vibration area) of a speaker, the lighter it is, the larger the rigidity is,
the better-the cone shape-the diaphragm shape is to eliminate the front chamber effect of the
force It is better to use a flat plate. Light weight and high rigidity with a flat diaphragm 3-. In
order to achieve this, it is best to use a light core material with a high modulus surface material
(it is best to make it a sandwich structure that has a sexual feeling). Conventional flat panel
loudspeakers are mainly made of Al honeycomb having a hexagonal cell shape as a core material,
or a sandwich structure having a plastic foam as a core material. However, a lithographic
diaphragm using an aluminum honeycomb has a complicated manufacturing method, is
expensive to manufacture, and is difficult to apply as a widespread speaker such as One Telech.
Further, in the case of the foam core material, there is a drawback that the rigidity is low and
sufficiently satisfactory acoustic characteristics can not be obtained. The present invention is to
provide a diaphragm for a speaker which is most suitable for use in a television for audio
multiplexing by making it one rigid or high in one acoustic characteristic in view of the abovementioned point and having a rectangular shape, and which can be manufactured at low cost. .
Examples of the present invention will be described below. Example 1: As shown in FIG. 1, the
core material 1 was expanded 40 times as a core material, no styrene foam (Dylark: registered
trademark, Kekisui Chemical Co., Ltd., k), thickness S cabinet, length 250 + w. 4-1 Use the
aluminum foil (20 / IIm) as one surface material 2.2 'using the one cut into 50 mm in widthbonding the surface material 2.2' to the surface of the core material 1 with a polyamide based
film adhesive The base material is used as the base material, and the one in which the aluminum
foil 3, 3 ′ (80 μm) is attached to the side surface in the long side direction of this tea material
is used as the diaphragm.
Example 2 As shown in FIG. 2, a plurality of rectangular columnar bars 5 bonded to aluminum
foil (20 .mu.) 4 are bonded to one face in the direction of one long side to form a rectangular flat
core The surface material 2, 2 'is attached to this surface to form a diaphragm. The following
table shows the spill force using the conventional rectangular diaphragm and the first and
second co-image frequencies of the loudspeaker using the diaphragm of the first and second
embodiments. (1) Missing-wave number (Hz) No. 2 Hisashi familiarization withdrawing (Hz
conventional example) 4051620 (without reinforcing material: Example 14871802 Example
249518155, -1 vibration of one rectangular plate as apparent from the above table When the
reinforcing thin plate is provided in the direction of the long side of the plate, the rigidity is
increased, the first and second resonance frequencies are increased, and the reproduction band is
expanded. It should be noted that in the case of a rectangular flat diaphragm like the diaphragm
of the present invention, at a first primary resonance frequency, two or more node lines parallel
to the short side of one rectangular flat plate are generated. As a result, the first resonance is
eliminated, and a flat sound pressure frequency characteristic is obtained up to the first second
resonance frequency. The present invention is configured as described above. According to the
present invention, the following effects can be obtained. (1) The rigidity of the diaphragm is
increased and the one resonance frequency is increased, and the reproduction band is expanded.
(2) A rectangular flat speaker with excellent acoustic characteristics can be obtained, so when
used as a television speaker-the size of the television receiver becomes smaller, and it can be
used as a special audio 7 for audio multiplex television "" 8 "-" There is an optimum 1 ... 13 cheap
rectangular flat diaphragms can be obtained. ツ