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DESCRIPTION JPS5240093

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DESCRIPTION JPS5240093
Good first person 42 agent ■ Japan Patent Office ■ Japanese Patent Application Laid-Open No.
52-400930 Japanese Patent Application No. 52. (1977) 3.28 Japanese Patent Application No. tOi
/ l / θ tag [phase] Application date 50. (Tc + 7 sentences) 7. ZZ examination request unclaimed
(all three pages) Office serial number 7 シ, yt j j-Ftl statement title of invention
Alarm sound generation circuit
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for
generating an effective alarm "" using an electroacoustic transducer (hereinafter referred to as a
transducer) having a resonance point. Heretofore, there have been the following problems with
the converter for alarm sound generation used in small portable devices such as, for example,
watches and pocket pels. っ′I! Since the converter needs to be operated with small size and
low power consumption, it is very effective to drive at the transducer resonance point (the point
where the sound pressure is maximum). Ρ) The frequency of this resonance point is reduced to
the frequency of the resonance frequency it; it is extremely high, and there is a limit to
miniaturization in selecting 1 to 4 KHz suitable as an alarm sound. For example, assuming that
the radius of the diaphragm 5 in the structure of the converter shown in FIG. There is a
relationship of approximately Sf 6 αa / l ′ ′, and if the radius α is made smaller, fo becomes
higher and one. An object of the present invention is to efficiently drive at a frequency that is an
integer fraction of the resonance frequency with an appropriate pulse duty even with a converter
having a resonance point at a high frequency, and generate an audible alarm sound. Hereinafter,
the operation of the present invention will be described in accordance with the drawings showing
the embodiments. And arrange the ring-shaped magnet 4. A diaphragm 5 having a plate 6
formed of magnetic material 2)> is supported by a support frame 7. A current proportional to the
current is applied to the diaphragm 5 by the current flowing through the coil 3 = 2-EndPage: 1,
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and the diaphragm 5 vibrates. FIG. 2 shows an alarm sound generation circuit. The output of the
drive pulse generation circuit 8 is transmitted to a current amplification transistor f9, and a
current flows to the converter 10 of the structure of FIG. 11 and 12 are power supply terminals.
Although the drive pulse generation circuit 8 is not shown. A pulse oscillator such as a nonoverrunning multivibrator or a circuit for manipulating the waveform of a signal from a dividing
stage of a crystal oscillator in a wristwatch or the like is nipped. The output of this circuit is a
frequency substantially equal to one node of the resonant frequency line f of the converter, and
the pulse duty is selected to be less than or equal to one second. The reason for this is that the
pulse width of the current supplied to the falsification converter, which is actively driven by IQ, is
as narrow as possible, and the peak value is larger. It is effective because it is easy to cause そし
う。 Figure 19 (a) shows the force acting on the diaphragm 5, (b) shows the displacement of the
diaphragm at that time, and it vibrates at a frequency f. When it becomes half cycle or more, j &
moving plate tries to move in the direction opposite to the direction in which it is driven, and
force in the same direction is applied. It is clear 〃 λ.
FIG. 4 is a diagram when driving at the + frequency of /, p (b) is the output waveform of the drive
pulse generator 8, (b) is the current waveform flowing through the converter 10. This waveform
is not a square wave (it becomes a curve with a redundant number because it is due to the
inductance of the coil. A t force is applied to the diaphragm 5 in proportion to the current as
shown in FIG. The displacement of the diaphragm 5 at this time is shown in FIG. The frequency of
the waveform of 0) is selected to be approximately f0 / 2, but the diaphragm is immobile at the
frequency of fo. However, as shown by the envelope connection of the waveform of), the
characteristics of f · / 2 are shown. The vibration is the frequency of fo, but it also contains many
of its ten frequencies #xIit. 4-The output of the drive pulse generator in FIG. 4 and FIG. 5 has a
frequency of fo / 2 = or f, / 3, and the period is 2/10 or 3 / f0. Also, the pulse width is 1/2 fo in
all cases, so the pulse duty is 1 symbol or +. Therefore, generally, when driving at a frequency of
1 / s (% is a positive integer) of the resonance frequency /, the oscillation at fo can be positively
operated unless the drive pulse duty exceeds 1/2%. As a whistle / /, I will feel a lot of frequency
share of 10 / 聾. As described above, according to the present invention, even a converter having
a high resonance frequency of, for example, 6 KHz, can operate at a resonance point, an
efficiency of operating at a resonance point, and a low frequency It is also possible to take out
ingredients, and use this kind of action
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
an electroacoustic transducer, FIG. 2 is an alarm sound generation circuit diagram, and FIG. 3 is a
diagram showing an embodiment of the present invention. Shows the relationship between the
force applied to the diaphragm and the displacement, and FIG. 4 shows the drive pulse waveform,
the current flowing through the transducer, the force acting on the diaphragm, and the
displacement of the diaphragm when driven at + of the resonance frequency f0. It shows. FIG. 5
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shows the case of driving at the same + frequency, and shows the same characteristics as FIG. No.
1 e center ball, 2 ψ plate 3 · · ring-shaped magnet, 406 coil, 5 · · · 1 moving plate, 6 · e magnetic
plate, 7 · · · support frame, 8- fist drive pulse generation circuit, 9 @ · transistor. 10 · · ·
electroacoustic transducers, 11, 12 · · · power terminals. 6 above EndPage: 2 Fig. 1 Fig. 3 (C) (D) 5
第 Fig. 2 Fig. 4 Fig. 4 483-EndPage: 3
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