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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the entire
structure of a conventional microphone, FIG. 2 is a side cross-sectional view of the main part of a
conventional diaphragm, and FIG. 3 explains one manufacturing method of the diaphragm FIG. 2
is a side sectional view of an essential part of a diaphragm for a condenser microphone according
to an embodiment of the present invention. 10 · · · · · · · Ring for film coating, 11 · · · · · · · · · ·
plastic film, 12, 13, 14 · · · · · · · · · evaporation surface.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for
condenser type microphones. FIG. 1 shows the entire structure of a conventional microphone. In
the figure, the vibrating membrane 3 is fixed to the membrane ring 1 using an adhesive and is
tensioned. The diaphragm 3 holds a suitable gap between the diaphragm 6 and the fixed
electrode 9 which is smoothed. The fixed electrode 9 is fixedly supported by an electrode support
case 7 made of an insulator, and the terminals 6 of the fixed electrodes -7, 9 penetrate the center
of the electrode support case 7 and are pulled out to the outside of the stomach 2 stomach. Also,
the film covering ring 1, the fixed electrode 9, the electrode support case 7 and the like are
covered by the outer casing case 8 and are crimped and fixed at the lower end 8 '. A conventional
vibrating membrane, which is mounted on the condenser microphone configured as described
above, is configured as shown in FIG. That is, 1o is a ring for film coating made of an insulating
book such as plastic, ceramic or glass, 11 is a vibrating film made of a film such as plastic, 12 is a
metal-deposited foil deposited on vibrating film 11, 13 and 14 are It is a metal-deposited foil
deposited on the side surface and the top surface of the phosphorus for covering film, 1o. When
producing a moving film having such a configuration, the metal ring 10i is fixed on the plastic
film 11 by an adhesive or heat fusion or the like at a stage where metal deposition is not
performed, and thereafter, As shown in FIG. 3, metal deposition is carried out to a total of 1 m
including the ring 10 for film coating and the vibrating film 11 from the upper surface. After
that, do not cut and cut for each valley membrane ring. Section 3 However, in the case of film
deposition with such a structure, when metal deposition is carried out, since the flying surface of
the metal molecule itself is substantially parallel to the inner surface of the ring for film coating,
metal is deposited on this side <<<<, the probability that the metal-deposited foils 12 and 14 in
FIG. 2 do not conduct is greatly increased, and the sensitivity of the microphone is greatly
reduced. That is, the conduction between the vibrating membrane 3 and the outer casing case 8
shown in FIG. 1 is less than that of the conventional structure around the vibrating membrane.
The present invention seeks to eliminate this shortcoming. One embodiment of the present
invention will be described below. In Fig. 4, 10 is plastic or ceramic. 11 is a diaphragm made of
an insulator such as glass, 11 is a vibrating film made of a film such as plastic, 12 is a metaldeposited foil deposited on -L of the moving film, 13 ° 14 is a 1111 of the film ring The part of
the metal deposition disease covered on the surface and -L surface is shown.
The difference from Fig. 2 is 1t in 1IllI 而 of the ring for membrane coating. It is a point that is
tapered, and gold (-(ma, i ′ ′ ′ 1 ′ ′ is 4 ° self- ′ ′) is sufficient for conduction on the
inner surface even if the metal deposition is performed. Metal is steamed. The metal-deposited
foil 12 is configured to be electrically driven out of the outer casing case 8 by the metaldeposited surface 14 deposited on the upper surface of the covering ring 10. As is apparent from
the above embodiment, according to the present invention, it is apparent that the inner surface of
the diaphragm ring is tapered so that sufficient conduction d between the diaphragm and the
outer case can be obtained to prevent the decrease in the sensitivity of the microphone. You can
do it. The angle of the taber (16 in FIG. 4) can not be made so small in order to maintain the
strength of the portion used as a collar of the ring, and 600 to 75 ° is desirable.
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