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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional flat
panel speaker, FIG. 2 is a cross-sectional view of the flat panel speaker of the present invention,
and FIG. 1 is a diaphragm, 2 is a voice coil, 3 is a cross, 4 is a center pole, 5 is a plate, 6 is a
magnet, 7 and 8 are clampers, 9 is a braking agent, and 10 is a screw.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of frequency characteristics. Conventionally, as shown in FIG. 1, a flat type speaker has a
magnetic circuit composed of a center hole 4, a plate 5 and a microphone 6, A magnetic air gap
is formed between the center pole 4 and the flat 5, and the central portion is surrounded by the
center hole 4 and the clamper 7i, and the peripheral portion is surrounded by the great 5 and the
clamper 8. A voice coil 2 made of a spiral conductor foil such as aluminum or copper is flinted on
the top of the magnetic gap. In the case of / 74 ° 2 , distortion sound is generated, and
there is variation in frequency characteristics), so the damping material 9 is placed on the lower
surface of the diaphragm 1 to apply braking to control the frequency characteristics. The noise is
suppressed but the characteristics of the diaphragm 1 position Q is changed sharply, so the
position of the wheel coil 2 of the diaphragm IL is pushed up, and the frequency characteristic
and the variation of the sound pressure characteristic occur. was there. The present invention
has been devised to eliminate the above-mentioned drawbacks, and the embodiment shown in
the drawings (if it is explained in detail, FIG. 2 (as shown here, the plane of the synthetic resin
diaphragm 1 (from the spiral conductor foil) The voice coil 2 is printed, and the -L underside of
diaphragm 1 is thin with acoustically good transmissivity such as cotton, glass etc. (wrapped with
cloth 3 and center the center part of vibration & 1 and cloth 3 Hole 4 and clan half 1 frame 1 are
completely screwed, and the periphery is covered with a fret 5 blade-8 each, screw 10 (screw
clamp, voice coil 2 at magnetic gap top position (this position) It is a flat type speaker in which
the moving member 9 is inserted and braking is applied. The present invention has a structure
like 1-1. (Since it is ..., it is better than 5 votes, and the Heuss coil position is less than 5 letters.
FIG. 3A shows the frequency characteristics of the conventional flat-plate speaker, in which the
portion surrounded by a circle fluctuates rapidly. FIG. 3B shows the frequency characteristics of
the flat root type sneaker of the present invention, in which the portion surrounded by a circle
fluctuates gently. At the same time, the distortion sound is reduced and the variation in sound
pressure characteristics is also reduced.