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JPS5255239

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DESCRIPTION JPS5255239
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a microphone device to
which the present invention is applied. FIG. 1 is a perspective view showing each part, FIG. 2 is a
perspective view of an assembled state, FIG. Fig. 4 is a perspective view of the apparatus
mounted on a cassette type tape recorder, Fig. 4 is a sectional view taken along line IV-IV in Fig.
3, Fig. 5 is a sectional view showing directivity, and Fig. 6 is Fig. 4 FIG. 6 is a sectional view taken
along the line VI-VI, FIG. 7 is an enlarged sectional view showing a crimped state of the opening
and closing member, and FIG. 8 is an enlarged sectional view showing a modified example of the
opening and closing member. In the reference numerals used in the drawings, 1 is a microphone
device, 5 is a microphone pad, 5a is a mounting portion, 5b is a support portion, 5c is a crimping
portion, 7 is a microphone body, 37 is a sound passage hole. -107- actual opening 52-55239 (2)
Fig. 1 Fig. 2 Fig. 3-ios-actual opening 52-55239 (3) Fig. 4 Fig. 7 Fig. 8-109-
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to opening and
closing the passing sound passage hole with the opening and closing member opposite to the
diaphragm ring side of the microphone ring, and this microphone intriguing characteristic <M
(11 ■ It is a dangerous microphone device capable of switching between phantom k state and
non-directional state, and is most suitable for application to various sound 41 devices such as a
tape recorder. Conventionally, most of the microphones incorporated in tape recorders and the
like have been omnidirectional. However, recently, there has been devised an eucrophone device
in which the microphone can be switched between directional characteristics and nondirectional
characteristics according to the purpose. In general, in such a switching microphone, while a
sound transmission hole is provided at a position opposite to the diaphragm, the i microphone is
configured to be able to pop out while running to the cabinet, and when the microphone is
pushed into the cabinet The sound hole t-closed by the opening and closing member, nondirectional property WK switching. また! The structure is such that the sound passing hole is
opened to switch to the directivity state, rather than when the microphone q phone is ejected out
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of the cabinet. In the inter-finger state, when the sound passing hole is completely opened, the
sound 9 collected from the front side of the diaphragm goes from the front side of the diaphragm
to the opposite side to the sound passing hole ( 21. The sound wave picked up and the sound
wave picked up from the opposite side of the diaphragm respectively exhibit a phase shift t of the
foot, and as a result, the diaphragm vibrates only by the sound wave obtained from the front side
of the diaphragm. Phenomenon. However, conventionally, a sponge is used as the opening and
closing member of the sound passage, and as described above, the structure is such that the
sponge is used to close the sound passage with the molten sponge in which the microphone is
pushed into the cabinet. However, the sponge is weak in elastic force and must be crimped fairly
strongly. For this reason, K must take the above-mentioned indwelling stroke of the microphone
considerably, and the moving space of the microphone has become considerably large. In
addition, the complete sealing of the sound passage hole is extremely difficult, and the sound
wave is likely to be collected in the sound passage hole, which may cause a semi-directional state.
Furthermore, as described above, since it is necessary to have a relatively strong indigenous
strength and one spotty line lacks restorability, the sponge can not return to its original form if
the sound-passing hole is closed for a long time. There was a bad effect as described above. (3)
The present invention was conceived to correct the above-mentioned defects, and a microphone
device for switching between the 19 directivity state and the non-directional state by opening
and closing the sound passage as described above. In the above, the opening and closing member
for opening and closing the sound transmission hole is made of a rubber member, for example,
urethane rubber, and this rubber member is attached to the part for attaching the part to the
predetermined attachment. The elastic support and tube that support the crimped part that is
elastically crimped and separated elastically with respect to the sound hole, and the relatively
rigid crimped part, and the crimped part with the above-mentioned mounting in a state of high
elastic effect with respect to the part By being configured as described above K, the soundpassing hole can be completely sealed for a long period of time while the compression stroke of
the microphone is reduced, and the directivity state and the non-directivity can be achieved. State
and high resolution It can be switched on.
Next, an embodiment in which the present invention is applied to a tape recorder will be
described with reference to FIG. First, the structure of the microphone device (hereinafter simply
referred to as the present device) (1) will be described. (4) The main components of the present
device (1) are the microphone how-sink (2), the microphone case holder f31, ff "+51.-F case (6),
microphone body (7). The above-mentioned microphone howsink +21, my 9 fuller +31, and my
hand 3 character addition base (6) are respectively integrally molded using a synthetic resin. And
the mike housing (2) is for the s village which accommodates the above-mentioned mire t ru da
(3) and the mike case (6), and the lower part (two mounting holes 81 in the lower part (9) 9, the
rubber bush Qtl QIl from above and below this attachment is inserted hole + 91 KfiIC. My picture
again? -The crudder (3) is a microphone case (6) t-held and has eight characters and the square
plate azug is integrally formed in the mutually opposing pictorial information, and the axis is at
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the top position respectively The insertion hole f141α is formed. A lock hole iIe is provided
immediately below the nine-axis insertion hole I at tK. Incidentally, projections II (12a) and (13a)
are respectively provided in III @ Ul (Flltll of 131, and screw holes 071Qg are integrally formed
in these. At the center position of the rear end of the microphone holder (3), a cylindrical
projection @ (41 is integrally formed, and the microphone pad (5) is fitted on this. またこのマイ
5. In the Da Br; (5) -fal, the nine operation knobs □ are integrally formed with an elastic effect
by the two notches 12Q1211K. And, in the longitudinal direction of the sweep knob t23, in the
longitudinal direction of the V central portion, the projection is integrated with the inner side
position of the side plate 1m of the microphone case holder (3) of the claw which is integrally
formed. Are molded. A pair of left and right protrusions are integrally formed on the lower side
of the front end side of the microphone case holder (3). Further, on both sides of the front end
position of the microphone case (6), shafts (G) and (C) are respectively integrally formed, and of
these, a winding spring [9 is fitted in the shaft 12i. In the lower position of the shoulder position,
a locking piece (2) is integrally formed at the center part of the sleeve and a stopper piece at theside thereof. The microphone attachment of this microphone case (6) is formed with a hole (d) at
the center of the surface (6a) and the microphone attachment is formed with a brass additive
metal, for example, Nine balancers (7) are embedded.
The balancer luster is fitted in the fitting hole 1419 formed in the majestic (C), and is fixed by the
back surface force (6) bar 14nK fixed to the rear face fiat-v case (6). However, the front side of
this balancer is fixed by the front cover (c) described later. Therefore, the balancer 1 of the
present invention is embedded in the microphone case (6) K without any adhesive and without
any rattling. On the other hand, it is molded into the above-mentioned microphone body + 71Fi
cylindrical body, and its positive j1 ml! Diagrams (G) are buried in the This microphone main
body (71 is switched to directional property, habit and non-directional property, as will be
described later, therefore, the position on the opposite side to the above-mentioned diaphragm,
that is, back position is opened and closed A free sound passing hole cSy + is provided. The outer
face of the microphone body (7) is fitted with a nylon bushing having an appropriate elastic
effect, and the microphone ring body (7) resists the elasticity of the nylon bushing. The
attachment is L or attached to the hole (2) K press-fit. According to such a press-fit structure, it is
not necessary to use an adhesive for attaching the microphone body (7) in the prior art, and the
attachment is not only very easy, but also the nylon bushing (t) (7) As a result, the microphone
body (7) is strongly tightened from the same song, the installation is stable, and there is no defect
such as dropping off. In the microphone mounting, the face (6a) is laid on the front cover laK.
The microphone body (7) comprises a base of the outer peripheral surface of the nylon bushing
(c) and the lower surface 1 of the inner surface of the mounting hole (2). The mutual plating
prevents rotation of the microphone case (6) K. Therefore, the sound-passing hole (37 + is
formed of a rubber member having high elasticity such as silicon rubber, etc., for opening and
closing the microphone pad (5 L). The mounting is in the form of a part (5a), a semi-spherical
supporting part (5b) in the middle, and a crimp on the sound passage hole (9) at the upper end-
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(5C) It has been molded. The crimped portion (51e) has a relatively thick structure that is
relatively thick and does not deform easily, and its F [f11 conforms to ± attached surface (5Cl) is
finished with a chamfer. . Further, the support portion (5b) has a very thin wall thickness, has an
extremely high elastic effect, and elastically supports the pressure contact II (5C) 8).
Next, a method of assembling the present device (11 will be described. First, the microphone pad
(5) is attached to the projection (41) of the microphone case holder (3) by the part (5a) K. At this
time, the mounting It (5a) is elastically crimped to the outer periphery of the projection (4) and
securely fixed, so that the microphone pad (5) can be attached to the projection (4) without using
any adhesive. There is no danger of falling out. Next, the microphone case (6) is attached to the
microphone case holder (31, which inserts the shaft 1251cl11G into the shaft insertion hole
ff41f15, and can freely rotate the microphone case (6) against the microphone case holder (3) K
Join. At this time, one end of the wound spring ti9 is locked in the locking hole αθ and the
other end is brought into contact with a part of the microphone case (6) K so that the
microphone case (6) both tubes (2) 4 and 5 in the clockwise direction centering on (1). When the
microphone case (6) and the microphone case holder (3) are combined as described above, the
crimp surface (5C) of the microphone "Sodo" is located below the sound passage hole (9) of the
microphone body t7). ') K will face each other. (9) After that, the i case holder (3) and the mike
case (6) coupled to each other as described above are accommodated in the microphone 1
housing (2). The lower case is inserted into the pair of projections (12a) and (13a) of the
microphone case holder (31). Then, with this shape, the microphone case holder (3) and the
microphone case (6) are inserted from above into the microphone housing (2), and the two
projections (12a) (13a) are inserted into the microphone housing (21 pair of The mounting is
inserted into the hole (9). At this time, a pair of cylindrical parts (10b) which are integrally
formed on the lower surface of the inner insertion hole (10a) of the rubber bush iI are fitted to
the inner surface of the upper collar of the hole (9). . Next, from the bottom of the microphone
housing (2), the both mountings are engaged by a pair of cylindrical portions (nb) K integrally
formed on the upper surfaces of both shoulders with rubber bush Ti11 in the lower 41M of the
hole 19) Let Then, a pair of insertion holes (lla) and rubber rubber push which are both v'CFRshaped on both ends of the rubber bush (old from bottom of housing 121) are added to the
machine. (In the insertion hole (10a) 'yc-1 pair of attachment is through the screw OUa, these
two attachment is formed in the microphone case holder (a pair of projections (12a) (13a) of the
upper end of the screw 113iI 31 Secure by screwing into the pair of screw holes +171.
As described above, the assembly of the main device (1) is completed, but at this time, the
microphone case holder 1: ('if elastically supported on the lower surface Nf 81 of the microphone
housing (2) via the rubber bush Q + J The mounting is elastically supported to the microphone
housing (2) by each pair of cylindrical parts (10a) (lla) of the 4 · 1 both rubber bush 011αD of
the screw clυ. Furthermore, FIG. 83 shows the book assembled as described above Shows a state
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in which the device f1 · is incorporated at a predetermined position of the tape recorder (at), and
in this case, the attachment provided at the predetermined position of the Kti cabinet (at) is the
device (1) in the opening m. A pair of mountings of the insertion system and the microphone
housing (2), which are integrally formed with surface pressure, are screwed to the cabinet c 31
by a pair of screws 611. Further, the operation knob {circle over (4)} of the present device (1) is
projected from the knob insertion hole 114 formed in the cabinet 3 'to the outside of the cabinet
[having] αB. Thus, the present device (1) is configured to be switched between the microphone
body (7) t-directional property and the non-directional state, and the switching method will be
described below with reference to FIG. 84 and FIG. . First 81! 4 shows the state switched to the
non-directional state, at this time the microphone case (6) is pivoted in the direction of the hour
hand against the winding spring 09 against the shaft (3) □ □ □ □ gold center, The microphone
case (6) is housed in the microphone housing (2), and the microphone body (7) has a so-called
built-in microphone shape. At this time, the locking piece Q4 gets over the claws against the
elasticity of the operation knob and is locked to it, so the microphone case 16) is fixed by the
pushed spring as described above. When the microphone case (6) is pushed in, the elastic
microphone pad (5) is elastically crimped to the light weight of the sound transmission hole (4)
by the crimp portion (5C) as shown in Fig. 7 ridge line. Is sealed. In this, (9 microphone body (7)
is in a non-directional state. At this time, the sound transmission hole c371 is crimped obliquely
to the microphone pad (5) K by the circular motion centering on the axis 1251 (c), but the crimp
1ll (5 c) of the microphone pad (5) Due to its relatively rigid construction and its crimped thl (5c
') being hard-faced, and the structure in which the lower part of the crimped part (5C) is
supported by the resiliently effective support (5b), As shown in FIG. 6, the crimped portion (5C)
portion hardly deforms, and only the support portion (5b) portion is distorted against elasticity,
and it is in a state where it is just broken by rent and Become.
As a result, in the vicinity of the tip of the crushed surface (5C ') W'i sound passing hole (9), it is
closely adhered in parallel in an inclined manner corresponding to the inclination. That is, the
microphone pad (5) is soiled by the so-called self-aligning action with respect to the sound
passing hole '; 3nK, as a result, the sound passing hole (9) is completely sealed completely. Also,
the microphone pad at that time (the pressing force of 51 is a dovetail. At this time, if a vent hole
(c) is formed at the bottom of the projection (4) of the microphone case holder (3), the internal
air will pass through when the microphone pad (5) is compressed as described above. The
external VCg is easily pushed out through the pores C9, and the compression resistance is not
added to the microphone pad (5), and the above-mentioned crushing is smoothly performed.
Also, as described later, when the sound transmission hole B is separated from the microphone
pad (5), external air is easily sucked into the microphone pad (5) through the vent hole 143 ', so
that the microphone pad (5) 2.) The inside does not go straight but the collar is smooth as
described later. Next i! ! 511EI shows a state in which the finger is switched to the same shape as
the finger, and at this time, the microphone case (6) is rotated in the hour hand direction about
the shaft 1251 (7) by winding a; ) Is in the condition of being ejected out of the cabinet. That is,
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when the operation knob (2z is pushed downward against the arrow with elasticity against the
elasticity in the focusing direction shown in FIG. 4), the claw is moved downward and this claw ■
is a locking piece □□ You can get out under □. At this time, if the microphone case holder (3)
may be bent at a certain angle or more in the direction of the arrow, the pair of projecting
clauses abut on the lower part +31 of the microphone housing (2) Since the deflection is limited,
it is possible to easily make a monument in the direction of the arrow of the operation knob q. As
a result, by the microphone case 161Vi winding spring I'11, it is automatically rotated in the
direction of the α (turn) hand centering on the axis '5' and pops out of the cabinet (2). At this
time, the microphone case (6) is stopped at a predetermined angle as shown in the figure, with
the end of the strike soar coming in contact with the projection (b) of the microphone case holder
(3). And at this time also the microphone body (7)! Since it rotates in the same direction along
with the ita case 16), the sound transmission hole Gη is separated from the microphone pad (5),
the sound transmission hole (9) is opened, and the microphone body (7) is in the directivity state
It becomes. At this time, the microphone pad (5) reliably returns to its original shape by the
elasticity of the support portion (5b).
FIG. 8 shows a modification of the microphone pad (5). In this case, the cross section of the
support portion (5b) is formed in a yU shape. According to this embodiment, the support portion
(5b) can be provided with a high elastic effect, and the crimped portion (5C) can be flexible not
only in the axial direction but also in the direction perpendicular to the axial center. Therefore,
even if the sound transmission hole (371 is misaligned in the direction of the above angle) with
respect to the pressure contact portion (5b) K, the pressure contact portion (5C) all sound
transmission holes c37 is not actually a s It is advantageous in that it exhibits a high degree of
self-alignment with the so-called axis. In the above embodiment, the microphone case (6) and the
microphone case holder (3) are configured to be mechanically floated with respect to the
microphone housing (2) by the pair of rubber bushes uO α11. Therefore, during the operation of
the tape recorder 2, the mechanical vibration of the cabinet (2) transmitted by the microphone
housing (2) K can be absorbed by the both rubber bushes Q1). As a result, the vibration becomes
the microphone body It is possible to prevent transmission to (7) and to prevent adverse effects
due to this vibration. However, both mountings increase the rigidity of # 'i when both screws
C311C3a are strongly tightened, and the rigidity of both rubber bushes qOα1) is increased, and
weak vibrations via the two rubber bushes Qlh from the microphone housing (2) 13) to be
transmitted easily, and to be transmitted to the microphone case (6) microphone body (71).
However, in the above embodiment, passers such as -1111 KX @ of the microphone case (6) are
embedded (I.I.19, and the mass of this i case (6) is increased to shift the co-photographing point
from K The vibration of the microphone case 6 due to the weak vibration can be prevented in
advance. As a result, the microphone body (7) Til- can be completely protected against
mechanical vibration, and it is possible to completely prevent the stimulation of vibration.
Therefore, according to the above-described embodiment, it is possible to completely correct the
defect that the microphone easily picks up, particularly, km in the low frequency range in the
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past, and the sound quality characteristics are dramatically improved. In the present invention, as
described above, the sound passing hole provided 7 'at the position opposite to the diaphragm of
the microphone is opened and closed by an opening / closing member made of a rubber member,
and the microphone has no directional characteristics. It is possible to switch to the directivity
state as follows.
Then, the opening / closing member KFi, the predetermined attachment is attachment for
attachment to the part, and the attachment is resiliently attached to the sound transmission hole,
and the relatively hard crimped part and the 8E attachment 4t-the attachment is the part On the
other hand, since the elastically supporting portion and the supporting portion are formed, the
opening and closing action of the sound passing hole is extremely surely made +171. That is, the
pressing force at which the pressing portion seals the sound transmission hole is always constant
and has a sufficient pressing force by the support portion of the opening / closing member. In
addition, the crimped part is extremely surely crimped to the sound passing hole by self-aligning
property, and the sound passing hole is completely sealed. Therefore, the switching between the
microphone condylar condyles and the omnidirectional habit is performed with high accuracy. In
addition, even if the spring for opening and closing members is pressed for a long time, it is
restored to its original shape without plastic deformation, so it is highly durable. In addition,
since a sufficient pressing force can be exerted on the opening and closing member, there is no
need to press the sound hole more strongly than necessary, and the structure becomes extremely
simple, and the pressing stroke of the microphone can be reduced. It is possible to make the
space for moving the microphone smaller.
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