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(2) Patent application (2) On March 8, 1974, the President of the Patent Office, Mr. Takeshi 4;
Agent 8160 (4) One proxy letter ■ Japan Patent Office Open Patent Gazette ■ JP 4873 L 29 @
Open Date 58 . (1973) 10.2 ■ Japanese Patent Application No. 17-33 Z Z ■ Application Date 泌
(197 /) 、, -P Examination Request not Requested (All 4 Pages) Office Serial Number ■ 0
Japanese Classification / l / (Va '/ 112 K2! 1 rl-rJull / 112 K 15 "□ □ name of the invention
Electrostatic seed electroacoustic transducer Electrostatic transducer conversion of electrostatic
type 0 using an electret diaphragm consisting of a thin film having a single surface charge of
positive or negative vessel.
t!! # Scope of billing
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called slippull electrostatic electro-acoustic transducer using an electret diaphragm. According to the
present invention, as shown in FIG. 1, it has a structure in which two electret diaphragms having
positive and negative surface charges ti are combined together. That is, (1) and (2) are electret
diaphragms, and metal layers (IB) and (2B) made of aluminum or the like are coated on the thin
films (IA) and (2A) of polymer films respectively. Jl! And are bonded together on the respective
metal layer (IB) and (2B) sides. And, as shown in the figure, the ground diaphragms (1) and (2)
are polarized so that, for example, the metal layers (IB) and (2B) 11111 are negative and the
opposite side is positive. (3) and (4) are back electrodes, and conductive layers (3B) and (4B) are
applied to the negative faces of plates (3) and (4) made of, for example, polymer resin. And the
air holes (5) and (6) are formed, and the diaphragms (1) and (2) are spacers so that the
conductive layers (3B) and (4B) face the diaphragms (1) and (2). (7) and (8) are contained and n
is sandwiched between the 2nd pole (3) and (4). Then, the signal source (9) is connected between
the conductive @ (3B) and (4B) of the back electrodes (3) and (4) through the transformer tll, and
the diaphragms (1) and (2) It is made to shake in accordance with. However, since such a
converter combines two electret diaphragms t = t each having positive and negative surface
charges, the thickness of the diaphragm becomes large and the mass becomes large, especially in
the high region. There is a disadvantage that the characteristics are degraded, and the cost is also
high. The present invention is made to eliminate such drawbacks, and an example of an
electrostatic electroacoustic transducer according to the present invention will now be described.
Let's explain dI, 2 figures or less. In the present invention, EndPage: 1i for an electret diaphragm
metal made of a thin film having a positive or negative single surface charge is used. In FIG. 2,
αυ is such a diaphragm, and is a thin film of a polymer film having a thickness of 3 to 25 μ @.
For example, a negative surface charge is included at a charge density of about 1 to 30 × 10 −C
/ d. Reference numeral a denotes a holding ring which also serves as a spacer, and the vibration
plate I is attached with an adhesive to the ring a with an appropriate tension. An electret
diaphragm having such a single surface charge has not heretofore been proposed, but it can be
easily obtained, for example, by the following method.
That is, as shown in FIG. 3, metal electrodes made of gold, nickel, etc. are crushed on both sides
of a thin film d of a polymer film such as polyethylene ester or polypropylene, and the metal
electrode is crushed. It is connected to a DC power supply at to apply an electric field in a heated
state. For example, the heat source it is gradually raised to 120 ° C for 10 minutes, and when an
electric field of about 30 KV 1011 is applied to 120′′C, n is maintained for 25 minutes, then
one field is applied f15 Allow to cool gradually over a minute. In this way, the electric field
strength and the IE pole d! When the film is removed, the film αυ becomes permanently
charged positively or negatively. FIGS. 4 and 5 show the basic configuration of an example of the
present invention converter having a .phi. For an electret diaphragm tube as described above,
and the example of FIG. 4 has a diaphragm .alpha. This is the case where it is used, and the
example of FIG. 5 is the case of the one having a positive surface charge as the diaphragm tL11
for the case of a tube. Also in the case of the μ shift, the vibration 11 is sandwiched between the
back electrodes 0 and α4 through the spacer surface and the u level, and the back electrodes
α3 and I are respectively made of, for example, plates (13A) and (14A) made of sieve molecular
resin. Conductive layers (13B) and (14B) are deposited on the surface to form vent holes t19 and
weirs respectively. Then, a signal source [9t transformer Jt- is connected between the conductive
layers (13B) and (14B) of the back electrodes α3 and σ4. If it is made like a bag, the diaphragm
1 will vibrate according to the signal. FIG. 6 is an exploded view of a specific example of the case
where the converter as described above is configured as a single housing, with the electret Ha
moving plate ttut attached to the spacer ring and holding ring αD, and vibration “I” Spacer tL
& which should be placed on the opposite side of 1/1 LI l, and a plate-like back electrode 13 with
vents 1 s and IL e l in the middle * respectively attached to spacer ring-and (l) tube prepare. In
this case the back pole! 131 forming a hole and forming a hole (surrounded by a ring (241)) and
forming a projecting surface integrally with the ring leaf. Similarly, the hole i7 across the m pole
of the back pole I- and the ring (ha)! At the same time as forming 81, forming a protrusion @ tube
on the ring four. And, the diaphragm ton attachment is held by the nine rings (7), the spacer tq
81 and the spacer ring @ and @ gold wheel attachment respectively with the nine back electrodes
t 13 and I, and the projection @ is inserted into the hole, In addition, the protrusion @ is inserted
into the hole (support) and the respective protrusion (2) and (a 會 crimp or weld). In this way, the
converter can be configured as a single housing.
FIG. 7 shows an example of a headphone using the converter of the present invention. **: In the
case of storing four of the above-described converter groups of the present invention. In addition,
61) is the case body, the country is a protective cover, 31 is an ear pad, (good) is a head pad. (Su)
is a sliding rod, (U) is a holder,-is a transformer, (B) is a cable for signal supply. According to the
headphone using the above-mentioned converter according to the present invention, its
frequency characteristic is as shown in Fig. 1g8 when measured with a 6 CC standard of the
standard, and the characteristic does not deteriorate in the high region, It is recognized. A nondummy dA converter can also be used for the speaker. The frequency response of the speaker of
the linear radiation type using the converter of the present invention is as shown by W49 @, and
it is recognized that excellent characteristics can be obtained even in the high region in this case
as well. According to the electrostatic electro-magnetic transducer of the present invention, since
it uses an ECL L / T vibration plate consisting of a thin film having a positive or negative singlesurface charge, as in the prior art. The thickness and the quality of the diaphragm are smaller
and the quality and the quantity thereof are smaller as compared with the one using two electret
diaphragms II-restraints with positive and negative surface charges, and excellent in the high
region. Characteristics can be returned, and the cost is significantly reduced. EndPage:
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a W of an example of a conventional
electrostatic electroacoustic transducer, an fIIR plane view showing a theoretical configuration ',
and FIG. 2 is used for an electrostatic @ electrical 1 tlf converter according to the present
invention Cross section of an example of an electret diaphragm ,! ! Fig. 3 is an illustration for
explaining the attachment for manufacturing the ton, Fig. 4 and Fig. 5 are an exploded
perspective view showing an example, and Fig. 17g is an electrostatic type electric f4 conversion
according to the present invention! 1 is a cross-sectional view of an example of a headphone
used, FIG. 8 is a frequency characteristic a diagram of the headphone according to the present
invention, and FIG. 9 is an electrostatic type electricity according to the present invention FIG. 7
is a frequency characteristic curve view of a 棲 radiation speaker using an f4 converter. [111 is
an electret diaphragm, 113 and I are back poles. (13B) 707: (148) a its conductive layer, 1151
and US its air vent, .sigma. 71 its holding ring with a spacer, u frame a spacer, tt 9 a signal source
and (support) a transformer. Fig. 2 no l Fig. 3 ii 4 mischief Fig. 6 plan Fig. 6 EndPage: 3 Fig. 8 Ijl
his 47 (Hz)-"1w II & (sz) □ EndPage: 4
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