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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional speaker
mounted state, FIG. 2 is a sectional view of a speaker mounted state according to an embodiment
of the present invention, FIG. 3 is a view of a sound absorbing sheet of FIG. 2 FIG. 4 is an
exploded perspective view of a sound absorbing and diffusing sheet which also serves as a sound
absorbing sheet and a cushion. - In the figure, 3.23 is a baffle plate, 4.24 is a butt end surface,
and 28 is a member. In the drawings, the same reference numerals denote the same or
corresponding parts.
structure for diffusing radiated sound pressure on the side of a baffle plate of a speaker cabinet
which is to be cut out. Conventionally, there was the one shown in FIG. 1 as the mounting state of
the speaker. In the figure, Row is a speaker, Attack J is a corn paper of fil, (3 ν is a baffle plate,
141 is a crown face of (3), a cushion struck between (1) and (3) A back cover, (7I is a sound
absorbing material provided inside (6). Next, the operation will be described. By the piston
motion of the cone paper 1j + of the speaker f11, the cone paper 1jl (1) 'f7, 4,. Radiant sound
pressure is generated in the direction of the back of the parakeet. It is already known that this
change in radiated sound pressure gives a bad effect ◆ to the mechanical motion of cone paper.
Conventionally, in order to prevent these meetings, although a sound absorbing material was
provided in the back cover (5I, it was insufficient for reflection by the butt end face + 41 of 3: of
the baffle plate located in close proximity to the cone paper I21 there were. Particularly in the
day density particle board used as the material of the baffle plate, its shadow ♦ can not be tax
free. In addition, circumferential narrow spaces tend to cause a whistling phenomenon due to
radiated sound pressure. The present invention was made in order to place the above-mentioned
points in order to solve the above-mentioned problem. A sound absorbing treatment is applied to
the butt end surface 141 of the baffle plate (31), and unevenness is formed on the surface
thereof, and sound absorption and diffusion of radiated sound pressure The goal is to obtain
smooth piston motion of cone paper. BRIEF DESCRIPTION OF THE DRAWINGS FIG. (21) Speaker,
(22) is cone paper of the speaker (21), (23) is the baffle plate, (2) Heaven · 2 "(24) is the mouth of
the baffle plate (23) , (25) is a cushion stretched between the speaker (21) and the baffle plate
(23), (26) is a back cover, (27) is a sound absorbing material, (28) is a sheet- is there. FIG. 3 is an
exploded perspective view of the sound absorbing member (28) of FIG. 2. FIG. 4 is a
development, perspective view of a sound absorbing member (28) and a sound absorbing
diffusion sheet for cushion (25) for rice. The sound pressure radiated in the backward direction
by the piston motion of the cone paper (22) is absorbed by the sound absorbing member (28),
and the remaining emitted sound soil is irregularly reflected by the surface irregularities. As a
result, a gentle pressure change can be obtained to the rear sound absorbing material without
sudden pressure change.
Therefore, the change in the pressure applied to the cone paper is reduced, and the electric
signal can be smoothly converted into the piston motion. In addition, when foaming materials,
foamed polyethylene, etc. are used, by choosing the shape of the free unevenness and the
expansion ratio, it is possible to absorb sound at an arbitrary frequency (3) 1 wisper · blue ratio,
reflectance It is also possible eggs to adjust. In the above-described embodiment, although the
appearance of the sheet at the butt end face was made clear, if it was processed as shown in FIG.
4, the cushion (can also be doubled as 51). Further, by sandwiching the front and back surfaces
of the baffle plate, it is possible to obtain a good adhesive surface. In this case, it is effective to
insert a break in the bent portion. As described above, according to the present invention, by
applying the sound absorbing and diffusing member having the irregularly formed back surface
reflection sound pressure to the butt end surface of the baffle plate, it is possible to reduce one
paragraph given to the piston interlocking of the cone paper, It is possible to obtain a smooth
conversion from a symbol to a mechanical motion.
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description, jps5572386
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