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DESCRIPTION JPS5312735

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DESCRIPTION JPS5312735
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of
an electrostatic transducer according to the present invention, and FIGS. 2a, 2b and 2c are each
directions for explaining the operation of FIG. FIG. 3 is a connection diagram illustrating the
terminal switching unit of FIG. 11 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 12 и и и ииииии Spacer, 13, 16 иии и и и Diaphragm (movable rod), 14,
17 ииииииииии Ring.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
transducer and, more particularly, to an arrangement in which the directivity can be selected in a
single unit. Generally, electrostatic transducers such as microphones, headphones or no-onesixteen speakers that make up an electrical ? acoustic conversion system are omnidirectional,
unidirectional or so-called eight-figure directional It is configured as a light having directivity of
only one of sex and the like. Although it is convenient to be able to select various directivity
depending on the form of use, in fact several units with the desired directivity have been
prepared and it is necessary to select from them It is inconvenient because it must be
inconvenient, and without such a preparation it is impossible to make a choice of directivity, and
must be used by units of the same directivity in any usage form. Therefore, the present invention
has been made in view of the above points, and it is an object of the present invention to provide
a very good electrostatic transducer in which various directivity can be selected with a single
unit. The following is an example of the present invention with reference to the drawings. It will
be described in detail. 4j, that is, in FIG. 1, 11 is a fixed electrode formed on both sides of the
back electrode M111 at the electret 112.degree. 113 'of the negative electrode charge, and this
fixed electrode oil has a plurality of through holes in the peripheral portion except the central
portion. 114 are formed. Then, on the electret 772 on one surface side of the fixed pole 11, a
first vibration IF (movable plate) 13 is bridged via an annular spacer 12 at an end portion
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thereof. Here, the first vibration [(movable plate) 13 is made to have the same size as that of the
fixed pole L, and is a metal ring xa K * provided and electro-static. A second vibration @ (movable
plate) 16 is bridged on the electret 113 on the other surface side of the fixed pole and the other
surface via a ring-shaped spacer 15 at the center thereof. Here, the vibration IF (movable plate)
16 of @ 2 is to be made smaller by the size of the fixed pole L), and the metal ring JFK is
provided in a stretched manner. In the electrostatic transducer, the first vibration IN (movable
plate) JJ or J derives the first terminal A from the metal ring 14 and the back electrode plate 1 no
to the second terminal B of one fixed pole L. The third terminal C is derived from the second
diaphragm (movable electrode) 16 or the metal ring 17, and these first to third terminals A, B are
derived. When C is separately used, various directivity can be selected from K.
That is, when the first and second terminals A and B are used first, the second diaphragm
(movable electrode) 16 is in the same condition as when it is not used, and this part exerts a
substantial action. And, when looking at the fixed pole oil side from the first diaphragm (movable
pole) 13 which is in use at this time, the back face is in a state opened S degrees by the through
hole 114, so as directivity Becomes unidirectional as shown in FIG. 2 falK. When the second and
third terminals B and C1i are used, the first diaphragm (movable electrode) 13 is in the same
condition as when it is not used, contrary to the above-mentioned case. Since the back surface is
sealed when looking from the second diaphragm (movable electrode) 16 to the solid electrode JJ
side, which is not in use and is in use at this time, the directivity is 2 becomes omnidirectional as
shown in FIG. Furthermore, when using a book having the first and third terminals in common
and the second terminal, the respective cases described above are combined at the same time to
be in a good state, and the directivity is shown in FIG. 2 tel. As shown in the figure, the eightshaped directivity obtained by combining the directivity of tal and tbl is obtained. Therefore, in
practice, for example, as shown in FIG. 3, the first to third terminals, 11. If C is connected to the
interlock switch L, St, unidirectionality at the position of the first fixed contact a of the switch by
switching of this switch L, 8 m, non-directionality at the position of the second fixed contact The
third fixed contact point C can be selected to have a figure-of-eight directivity. Therefore, as
described in detail above, according to the present invention), it is possible to select various
directivity by single unit, and it is possible to eliminate the conventional inconvenience and
irrationality, etc. It becomes possible to provide a transducer. In the above, the first and second
diaphragms (movable plates) lIt-electret may be used, or bias by other DC power supply may be
applied to either side without using 41 electrets. Of course, various modifications can be made
without departing from the scope of the present invention.
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