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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a protection circuit diagram of a basic h
speaker by a positive temperature characteristic thermistor, FIG. 2 is a graph showing the
relationship of the electric resistance to the temperature of the positive temperature
characteristic thermistor, and FIG. While showing the relationship between the protection
operation characteristic A of the positive temperature characteristic thermistor and the allowable
input characteristic B of the broken line speaker, the positive temperature characteristic
thermistor of the speaker protection device according to the present invention exhibits the
protection operation characteristic C shown at the normal program north input. FIG. 4 is a crosssectional side view showing a speaker protection device according to the first embodiment of the
present invention. 1 ... speaker, 2 ... positive temperature characteristic thermistor, 3 ... speaker
for i sound, 10 ... enclosure. In the drawings, the same reference numerals indicate the same or
corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker maintenance S device using a positive temperature coefficient thermistor. FIG. 1
shows the basic circuit of a loudspeaker maintenance device using a positive temperature
coefficient thermistor for over current limitation. In the figure, (11 is a speaker to be farmed, (2)
is a positive temperature characteristic thermistor. The positive temperature characteristic
thermistor (2) conventionally flows through the speaker 11 (1). In terms of electrical circuit, it
was noted that the loudspeakers (directly connected in series with or in a similar form as in Fig. 1
were connected, so that the current drawn by the No special consideration was given to the
location other than work efficiency. Next, as described in Fig. 2, although the operation will be
described in terms of the orthostatic degree characteristics-Mista stock), the change in electrical
resistance value is relatively small at a temperature range lower than a certain temperature, but
at a certain temperature or higher It is a one-bridge thermal resistance element whose electric
resistance value rapidly increases, and when current flows, when the temperature rise due to
heat generation reaches the rapid increase in the resistance value of Fig. 2, the calorific value
increases due to the increase in resistance value. In addition to this, the resistance value
increases at an accelerating rate, which is also an element having the function of limiting the
current flow. The time for starting the current limiting operation depends on the characteristics
of the element, the current value, and the heat radiation condition of the element, and an
example thereof is shown by the solid line in FIG. In a positive temperature coefficient thermistor
having such current limiting characteristics, a speaker having an allowable input characteristic as
shown by the broken line in FIG. When connected in a row, the speaker is protected in the range
of the input current where the solid line is to the left of the broken line, and in the case of Fig. 1
in S0, the large current Ha and the small current are not protected. It is possible to protect by the
method of limiting the output of the drive amplifier etc., and the latter is quite long in time, and
there is no need for maintenance in particular in practice. The current high-fi loudspeakers are
most often composed of a composite loudspeaker system in order to widen the reproduction
frequency band and the dynamic range. Loudspeakers used in hybrid systems generally have a
meeting cost that heats up the mass of the vibration system in the one that reproduces the higher
frequency band compared to the lower frequency side, and the voice coil conductor The
allowable input is smaller because it must be made smaller. Program sources mainly based on the
previous article, etc. contain high-level components with significant levels as peak values, but
their duration is short, so their average energy is small, and they are for high-tone Even if the (8)
-sewing 5- "tolerance input of the speaker is smaller than the tolerance input required by the
entire speaker system on the same time scale, it can be used.
However, when music by electronic musical instruments is used as a program source, or when
there is a failure or entertainment operation of a device such as an amplifier for driving a
speaker, there is a possibility that an ordinary program source may be input to a speaker having
a small allowable input. In such a case, the positive temperature characteristic thermistor 8
described above is used because the speaker is not broken even in such a case. 1 @-is used. In the
protection circuit for such purpose, the operating time of the positive temperature characteristic
thermistor needs to be short, but generally the heat resistance temperature of the voice coil of
the speaker is higher than the surge temperature of the positive temperature characteristic
thermistor and the heat radiation conditions are different. Therefore, in the case of the
conventional hold circuit, as shown in FIG. 3, there is a drawback that the imrw path is activated
earlier than necessary at a relatively low input and the sound quality of the reproduced sound is
impaired. (4) Everyone, [? Castle 1; This invention was made to eliminate the drawbacks of the
prior art as described above, and the positive temperature characteristic thermistor is cooled at
the time of normal program source input, and the operation start time is delayed. It is an object
of the present invention to provide a speaker storage device having storage characteristics. An
embodiment of the present invention will be described below with reference to the drawings. FIG.
4 shows the simplest case of a two-way speaker system as a composite type speaker, (1) is a
speaker to be stored, (2) is a positive temperature coefficient thermistor, (2) is a speaker for bass,
(4) ,) And (4b) are the connection cords leading to the input terminal of the loudspeaker 11 via
the positive temperature coefficient thermistor (2), the west leads to the other input terminal of
the loudspeaker (1)! II serial cord, (2) is the island wave number division network where the
connection cords (4b) and (2) are iI 絖 for high-pitched matter output, 17) and ... 1 is the bass
side output and bass speaker of the frequency division network package (9) is the input terminal
of the entire speaker system connected to the input side of the frequency division network (3), 鰺
is the above part, and (S) ′ ′ Path 2 P package Enclosure. Next, the operation will be described.
The electrical output from the amplifier driving the speaker system is applied to the input
terminal (91, divided by a frequency division network (61, the treble component is * M code (2)
and 1! The hood cord (41L), (4b) and the positive temperature coefficient thermistor (21 is added
to the speaker (one eye, low is the component is added to the bass speaker 儲 1 through the
connection cord (two, (8) .
If the measurement input characteristics of the speaker i11 and the operation% of the normal
salt f # thermistor 0) are related as shown in the US diagram, the% electric input is a program
source such as the pleasure of construction, and the electric power of low tm When the dynamic
energy is large, the sound of the bass speaker (2) also becomes active, and the positive
temperature characteristic thermistor installed on the back of the cone of the bass speaker 31 is
cooled tl, the operation time is delayed, In the above embodiment, the case of retaining the twoway high-tone speaker has been described, but the medium-tone and high-tone etc. of one or
more configurations are described. See if it is 0 "ゝ r −-=-! There may be one or two positive
temperature characteristic thermistors, or a positive temperature coefficient thermistor may be
provided behind the para-cig bragator, and the same effect as the above embodiment can be
obtained. In addition, a backload horn type may be used as the type of enclosure, and a positive
temperature characteristic thermistor may be installed in the throat thereof. In this case, since
the flow of air is fast, the cooling effect is particularly large. As described above, according to the
present invention, since the positive temperature characteristic thermistor is cooled by the bass
component, the maintenance operation does not start too early when the normal program source
is input, and the abnormal input In this case, it is effective to obtain a speaker protection device
that performs protection operation fast enough.
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description, jps55152782
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