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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video camera according
to an embodiment of the present invention, FIG. 2 is a signal waveform diagram thereof, and FIG.
3 is a block diagram of another embodiment. 1 ... metal piece, 5 ... differential circuit, 8 ... gate
circuit. Fig. 1 Fig. 2 ノ t no b) · WWN 1 0-41-real opening 51-13220 (2) C) direction Od) e)?
■R。 −42−
Detailed Description of the Invention The main body s is installed on the video camera body to
prevent the noise absorption of the 1'9 switching noise of the power supply from the 9
microphones. It is usual for a small tuple video camera to be attached to the camera body with a
small tuple video camera. A, L A power switch equipped with a conventional low pitch video
camera (hereinafter referred to as a camera) K is a mechanical switch Because it is the target, the
charge switch is on. The contact sound is generated when the switch is turned off, and the
contact V is transmitted to the microphone as a medium through the camera body of the upper V
to be reproduced as an unpleasant sound. SUMMARY OF THE INVENTION The present invention
aims at making the power supply controller of the video camera contactless to prevent
generation of unnecessary noise when the power is turned on or off. An embodiment of the
present invention will be described below. In FIG. 111, Iij is a piece, and 2 is a lift circuit +3 is an
integration circuit +4 is a DC amplifier +6 is a differentiation circuit +6 is a diode +7 is a free
prop and 8 is a gate circuit. The output waveform is integrated by the integrating circuit 3 of the
second stage as shown in FIG. 2 when the voltage of VB from the outside of the camera is added
to the '9 output terminal and + voltage is now added from the outside of the camera. The
waveform is as shown in Fig. 2b. Then, when the above waveform is applied to the DC amplifier
4, the output becomes zero as shown in FIG. 2C. Although the differentiating circuit 6 is provided
at the next stage of the DC amplification s4, since there is no signal of the output of the DC
amplifier 4, the output of the differentiating circuit 6 is 1 and the condition thereof is shown in
112,114, ** 21 ”°” ′ ′ 1 ′ ′ ° m′′1 ′ ′ is configured to be low level when supplied
from 3 parts of “a”. Then, as described above, flight II @ path 2 is raised and discussed Since
the tri-force signal is not applied to the input of the time KFi-flip 70----7, the output of the first
state, i.e., the flip 9-buff D--b 7 is at the low level. The state is shown in FIG. 2B. Therefore, the
power source vB is not supplied to the output terminal 9 because the gate signal is not applied to
the gate circuit 8 at the next stage of the gray block T. Next, gate-gate 8 is gated, the power
supply is used as a camera drive power source, and the circuit at 1:00 is explained. When the
metal piece 1 is touched by hand, the oscillation state of the oscillator circuit 2 changes, and the
zero discharge stops. Stone The output of the integration circuit 3 falls to fish. At the same time,
the output of the DC amplification circuit 4 has an output waveform which rises to near the
power supply voltage VB. The department section 112 a, h. Show aK. Furthermore, the rising
waveform of the output of the DC amplification circuit 4 is differentiated by the differentiation
circuit 6 and added to the pull-up buffer 7 through the diode 6 to add a stone and a + 7-dot flow
4 is inverted, and its output changes from low level to high level, and then the gate circuit 8 is
opened, and the voltage VB is led to the camera drive circuit through the output terminal 9. Then
the camera drive 1 again! When cutting off the voltage of the + @ road-, the same pulse signal as
one pulse is applied to the trigger loop 7 by the 11 hand touching the Kti piece 1, and the flipflop 7 vr is inverted again, and its output is It can be changed from high level to low level. Then,
since the gate voltage is not applied to the gate circuit 8, the voltage VB & bgr; is led to the
camera drive circuit. Next, another example of the invention is shown in FIG. 3, which will be
described as-) I / 1. @ 1 Figure t? Work the same as Duc! ! Both have the same number to eat.
Jl! The point is that two pieces of metal are separated and turned on and off separately. That
is, 1 is an ON-only piece, 16 is an OFF-dedicated metal piece, and the reference numeral is
followed by a dash to indicate OFF-dedicated-61 "" C ". 10d 4 y '4-! #: 2--611. 11 'is a switching
transistor, and 1λ 1 g is a condenser. First, when the voltage vB is supplied from the outside of
the camera, the metal piece 1 is touched by hand in the state III, and the gate circuit 8 is opened
and the power supply voltage vB is the output terminal by the same operation as shown in FIG. ·
The camera is guided to the I11 circuit through the stone, and the output of the blacklist U # 7 is
high level K1) so that the transistor 11 is activated to switch the output of the oscillation circuit 2
to the next stage Stop the signal to add. Therefore, once the on-metal piece 1 is touched by the
hand and how many times the on-metal piece 1 is bitten by the hand, it does not turn off. Next,
just touch the KFi off piece 1 'for turning off the gate circuit 8 according to the above-mentioned
state, and touch the + si piece 1' when you touch the + si piece 1 'and the oscillator circuit 2'-hlis not made. 7 7 K) The trigger pulse is added and 7 9 9 フ ロ T プ Tfltb force # High level Cara
lo level changes to 1 and gate ll # 18 is turned off. At the same time, add the low level of the
output of the 70% input to the transistor 11 'through the $ 10 Earpars! The output of ν6 and
the oscillator circuit 2 'is supplied to the ground via the switch 12'. Then, the gate circuit 8 is not
turned on even if the off-dedicated metal piece 1 'is subsequently bitten by hand. At this time, the
output of the oscillator 2 is led to the first experiment 3 without switching the rounding
transistor # 11 in which the output of the +7 leap flow signal $ is low.
Therefore, the gate circuit 8 can be freely turned on and off by breaking the metal piece 1.1 '. As
is clear from the above description, according to the present invention, since there are no dead
spots and no dead spots, no dead sound occurs. It is fk I / 1- that it is reproduced by the ear
because a pickle sound is not transmitted to the eyelid phone which is a camera Klj attachment.
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