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1'R sum 50 years B Japan Secretary of State Patent Office Hideo Saito 49 agent 160 160 Address
Tokyo 1 Shinjuku 8 Ward 1-8-1 (Shinjuku Building) Tokyo (03) 343-5821 (Representative)
Japanese Patent Office Publication No. JP-A-52-41524 Z, 2, g, 'Name of the Invention Description
of the Invention A capacitor-speaker drive device A signal delay comprising an inductor and a
capacitor on the output side of the amplifier A circuit is connected, a resistor having a resistance
value R is connected to the end thereof, and at least one of the capacitors of the signal delay
circuit constitutes a capacitor speaker, and the impedance viewed from the input terminal of the
signal delay circuit is A driving device for a capacitor speaker, wherein the inductance and
capacitance of the inductor and capacitor are selected so as to obtain the resistance value R of
the resistor.
Category of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive system for
a capacitor speaker. Conventionally, in order to drive a capacitor speaker, a voltage of about
1200 V is required as a voltage with an effective value. Therefore, conventionally, a step-up
transformer is disposed on the output side of the amplifier. A high voltage is obtained at the
secondary 111 to drive the capacitor speaker. Figure 1 is a block diagram showing this condition,
(1) is a signal source, (2) is an amplifier ,. (3) is a step-up transformer connected to its output
(one end), and the one-turn ratio is 1: n. (4)はコンデンサスピーカである。 Generally, the
capacitance between the loudspeaker (4) is about 5009F. In such a step-up transformer (3), when
calculating for its winding ratio n, for example, if there is an amplifier having an output of 100 W
and driving an 8 Ω load, the maximum output voltage is about 28 It becomes .3V. Since the load
solid speaker (4) having the capacity of 5009 F mentioned above is connected to the step-up
step-up transformer (3) (7) secondary 1jllK such as the step-up of external voltage transformer
(3) until this step is boosted to 1200 V When the capacitor having an impedance of 0.9 μF is
connected to the output portion of the amplifier (2) shown in the ivy viewed from the primary
side of the step-up transformer (3), it becomes an evaluation value. For example, when driving
such a capacitive load with a class 8 amplifier, the maximum amplitude in calculation can be
obtained, but only about EndPage: 17 KHz, and in the higher frequency band, the frequency is
higher than that. It is not preferable that the amplitude of the amplifier output is inversely
reduced in inverse proportion to the power loss of the amplifier exceeding the specified value.
The present invention overcomes these drawbacks and provides an apparatus which can
substantially improve the load as a capacitor speaker so that it can be driven to a sufficiently
high frequency. First, FIG. 2 will be described. This (9) shows a signal delay circuit, and (5a) and
(5b) are signal human power insulators, (6a) (6b) and (6c) are inductors, respectively (7a) (7b)
(7c) Are capacitors and (8) are resistors. By selecting the inductances of the inductors (6a) to (6C)
and the capacitances of the capacitors (7a) to (7C) respectively in a signal delay circuit such as a
kernel, the resistance value R of the resistor or load (8) It is conventionally known that, in the
above case, B in the impedance ztZ viewed from the input terminals (5a) and (5b). Therefore, in
the present invention, the diaphragm of the speaker (4) shown in FIG. 1 is divided into a plurality
of parts, so that the capacity per diaphragm is small, and in the circuit configuration shown in
FIG. 7m> (7b) (7C) All or a part of it is connected to the divided speaker of the capacitor speaker
(4), and the capacitor speaker capacitor and inductor (6a) The load as viewed from the input
impedance Z volume amplifier (2) is made to have the resistance value R of the resistor (8) by
appropriately selecting the inductances of (6) to (6c).
If FIG. 3 is demonstrated, about FIG. 3, it attaches | subjects the same code | symbol about the
part corresponding to FIG. 2, and abbreviate | omits description. In the present invention, a
common back play) j9) is provided, and the speaker device a is formed by facing the speaker hK
with an interval t of vibration 11i (10a) (10b) (10c) ヲ F'ir constant f). . Therefore, these
diaphragms (10a) (10b) (IOC),! C .: The capacities generated with the pack plate (9) respectively
form the capacitors (7a) (7b) (7c) to be received in FIG. In the embodiment of FIG. 3, a speaker
device f (11) similar to the speaker device a 'is provided so that the speaker device (11 and the
above-described device intersect each other when viewed from above, for example, about 90' ''. It
shows the case where the diaphragms (10a) and (10 heat), (10b) and (10b '), and (10c) and (10C)
are connected to each other with an opening. . Therefore, when the input fll (primary 1 it) K
signal of the step-up transformer (3) is to be supplied, this signal is used for each moving plate
(10a) (10a ') (10b) (10b') (10c) (10c) 10c, which can be driven. Moreover, in this case, if, for
example, a resistance of 20 KO is used as the resistor (8), the impedance Z seen from the step-up
transformer (a) i input side is Z = 11. Since the load impedance value can be sufficiently higher
than in the case of 10 at the beginning, and the impedance 2 in this case is regarded as a quasiresistance, FIG. It has a feature that can be made lighter than that of the indicated capacitive
negative VIt4). Incidentally, the resistance value R of the resistor (8) is expressed by R = f lot, L is
the inductance 1 of each of the inductors (6a) C6b) and (6c), and C is the capacitor (7a) (7b) (7c)
That is the volume between one diaphragm (for example, the imaging plate (10M)) and the back
plate (9). Therefore, the smaller the capacitance C, the larger the resistance value B can be. In the
diaphragms (10m) and (10b), (10b) and (10c), the 1 1 KN deviation occurs. The delay time Td is
expressed by Td = VI, and the capacitance between each diaphragm and the back plate (9) is h50
pF, 4-channel flII (6a) (6b) (6c) (D9ij). When the inductance is set to 20 nn H, the delay is 1 μs
each, and the delay in the propagation speed on listening does not matter.
The cut-off frequency fc of the signal passing through the circuit covered by the father is
represented by fc = □, and in the present invention, the value of the capacitance C can be made
as small as about 50 pF, so the transmission frequency compared to the case of FIG. Feature that
can be raised. しかも#! As shown in Fig. 3, by arranging the diaphragm that vibrates earlier in
time, by placing the diaphragm moving away from the limp position far from the loom position
as well as each other at the listening point. It is also possible to make EndPage: 2 so as to shortcircuit the time difference of the imaging movement by the diaphragm. Moreover, when each
speaker apparatus OD and (11 are made to oppose and it distributes, it has the characteristic
which can also consider the directivity. Although FIG. 3 shows the case where the conventional
speaker is divided into three, it is not limited to this and can be divided into many. Also, it is not
necessary to configure the back plate (9) in common, and therefore, a speaker may be configured
on each diaphragm @.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram for driving a capacitor
speaker, FIG. 2 is a connection diagram of a delay circuit, and FIG. 3 is a diagram for explaining a
drive current collection of a yol capacitor speaker according to the present invention. (2) is an
amplifier, (3) is a step-up transformer, (5a, 5b) is an input terminal% (8) of the signal delay
circuit, a resistor, and (1a) to (10d) U capacitor speaker diaphragm It is. Patent applicant Sony
Corporation Figure 1 Figure 2 EndPage: 3
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