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JPS5096212

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DESCRIPTION JPS5096212
Dec. 24, 1974 Patent Office Secretary Hideo Saito 1 The title of the invention h 裡 p p 国籍
(nationality) address 市 182 Tokyo Kofu city 261-6 Kojimacho Chofu Coporus 4 B 電話
Telephone Chofu (0424 G) ', (1) 1 (2) specification (2) Figure (3), sub-application' 1 (4) power of
attorney (and translation 'I1 M (呻 application) One written request, '0 Japan Patent Office Open
Patent Gazette ■ JP 50-96212 2 2! 指向 Specification, invention title, directional title
microphone
4, agent
4 Detailed Description of the Invention The present invention relates to an electrodynamic
directional microphone D In general, a directional microphone receives sound waves at the front
of the diaphragm and causes the diaphragm to act under pressure, and is also introduced on the
back of the diaphragm-good In order to obtain the characteristics, it is necessary to uniformly
apply pressure action and velocity action to the diaphragm in a balanced manner.-Figures 1 and
2 wJ show a conventional directional microphone, and play (1) ' Side plate vibration plate (The
sound path to introduce the sound wave on the back of 2Y (3 side is provided ◇ (4Y is a plate
with magnet (IY forms a magnetic gap on the opposite surface, inside this magnetic gap Voice
coil (5y is joined to the diaphragm and arranged at (@ 6Y is a yoke, (7Y is a damping material-is
◎ play according to the directional microphone with the above structure, play) (1) 'the sound
path (The sound wave introduced to 3Y After acting on the periphery of the plate, acting central
Yu忙 diaphragm bypasses the voice coil disposed in an extremely narrow gap (5Y. In the
microphone shown in FIG. 2, a sound path is provided at the bottom of the yoke and at the center
of the magnet. In this case, the sound wave acts on the center of the diaphragm to divert the
voice coil (5) 't' to the diaphragm. In this way, in the conventional directional microphone that
acts on the peripheral part, the velocity of the central part and the peripheral part of the
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diaphragm is temporally shifted, and the seven narrow magnetic gaps cause EndPage: 1 sound
wave energy large enough to vibrate It was not possible to simultaneously act on the entire plate,
and the microphone could not have sufficient directivity. The present invention is proposed to
eliminate the above drawbacks. Next, one embodiment of the present invention will be described
with reference to FIG. 5 and FIG. 4. In FIG. 5, (1) is a pole piece mounted on a cylindrical magnet
(2) An acoustic resistance material (3) such as a foamed resin is inserted into this hole 0 or an
acoustic path electrically connected to the center hole from the side surface of the pole piece (1)
is provided radially Further, the side surface of the pole piece (1) is inclined so that a gap is
formed between it and the diaphragm (6). (5) is a plate disposed concentrically with the outside
of the pole piece (1) and configured to form a magnetic gap with the pole piece (1). In the play
(5), a plurality of sound paths (8) are formed from the outer peripheral portion toward the inner
peripheral portion, and the sound paths (8) may be disposed on a straight line with the normal
(7) The inner peripheral surface of the preferred 0 or plate (5) has an inclined portion o (6) is an
annular diaphragm having a V-shaped cross section, and the edge portion of the diaphragm is the
pole piece (1), plate The voice coil (7) fixed to the upper part of (5) and fixed to the top of the
diaphragm (7) o (9) a disposed in the magnetic gap between the plate 1 and the plate (5) As
shown on the yoke, (Ila brake plate @ voice of the voice coil (7) The sound path (4) and (8) are
provided on both sides of the voice coil (7) so that it becomes the outer part of the voice coil.
Since the diaphragm and the diaphragm inside are given the same speed action, they vibrate in
the same phase, and the 0 or diaphragm is formed in an annular shape so that good directivity
characteristics can be obtained over a wide frequency band. The characteristics also have the
effect of obtaining flat characteristics without the occurrence of reverse resonance.
In the above embodiment, the cross section of the diaphragm is V-shaped, but it is inverted Vshaped or dome-shaped. It can be implemented even in the case of a flat plate.
4. Brief description of the drawings FIGS. 1 and 2 show the conventional directivity i microphone,
FIGS. 6 and 4 show the directional microphone of the present invention, and FIG. 3 is a
longitudinal sectional view, FIG. Figure 4 shows the top view ◎ (1) '-· · · plate, <2 Y-· diaphragm,
(3)' · · · sound path, <4 Y · · · · (5) '-voice coil (( 6) '-Yoke, (7Y-damping material, (1)-pole piece, (2)-magnet, (3)--acoustic resistance material, (4)-sound path, (5)-- · Plate, (6) · · Diaphragm, (7) ·
Voice coil, (B) · · · Sound path, (9) · · · Yoke, (lG · · Damping material ○ Patent applicant Foster
Electric Co., Ltd. substitute Patent Attorney Takayama, + 1EndPage: 2Procedure correction
written case display 1974 patent application No. 1311, name of invention Invention's namedirected directivity Rohon & Relationships applicant name 7 Oster Electric Co., Ltd. this
representative of the correction and the A person who incidents
4, agent
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Telephone Chofu (04B4) 83-1221 Name Patent Attorney (6108) Takayama Toshio & Corrections
subject (1) "Detailed description of the invention" column of the specification (2) Attached Figure
1 and Figure 2 Fang 1 and 2 6. Contents of corrections (1) Description Fang 3 page 20, “Normal
(7)” and “Voice coil (7)” to correct 4-1 ° (2) correct. ,--1 範 2 End EndPage:3
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