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JPS5482233

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DESCRIPTION JPS5482233
Description 1, title of the invention
Sound movie camera
3. Detailed Description of the Invention The present invention relates to a sound movie camera
having a microphone device detachable from the camera body, in connection with the
attachment of the microphone device to the camera body, a recording circuit or microphone in
the microphone device or camera body. The present invention relates to a sound movie camera
that changes the frequency characteristics of an audio signal transmission circuit connecting a
device and a recording circuit in a camera body or the sensitivity of a microphone device. In the
case of a sound movie camera, it is rare that the microphone device can be installed at the end of
the image in view of the image configuration, and it is difficult to handle the microphone device
according to the situation of the sound source while viewing the provisional landscape with the
finder. The microphone device M can be attached to and detached from the camera body so that
the microphone device M can be attached to the camera body. -Ten thousand, i1! In order to
record audio and images with film I, it is necessary to feed the film continuously at the recording
gate of the camera and to intermittently feed the film at the image recording gate, this
intermittent film feeding It is inevitable that relatively low frequency noise or vibration will occur
for delivery. In the case of a sound movie camera, special consideration has been given to the
improvement of the intermittent feeding mechanism or the adoption of a clean sound structure
for noise and vibration, and special consideration is given to microphone devices having good
frequency characteristics. As a matter of course, since the microphone device is often used apart
from the sound source, the microphone device is used with a high sensitivity microphone device.
For this reason, a piece, sound or vibration generated from the camera body side directly or
through the connection of the microphone device and the camera body and transmitted to the
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microphone device is picked up by the microphone device, and more or less rL recorded sound It
is not uncommon for the clarity to fall. According to the present invention, in a sound-projecting
camera in which the microphone device can be attached to and detached from the camera body,
the microphone device or the camera body in connection with the mechanical connection or
electrical connection of the microphone device to the camera body. Frequency characteristics of
the audio signal transmission circuit connecting the recording circuit or the microphone device
and the recording vit in the camera body or the sensitivity rt of the microphone device changes
the noise or vibration signal resulting from the h sound or vibration generated from the camera
body Not less than L company can be attenuated and clear voice recording and can be performed
below 0, based on the present invention and the embodiment of the drawings, will be described
in detail.
In FIGS. 1 and 2, the camera body 1 of the sound movie camera has a microphone head 4
attached to a telescopic boom 3 attached to a detachable microphone device 2 and a microphone
head 2 fixed to the camera body 1. It is locked by the movable table 6. The movable hook 6 is
supported by the shaft 7V on a rotating day J, and can be pressed EndPage: 2 to a position where
it is locked in the locking hole of the camera body 1 against the spring 9 by the locking knob 8 .
A contact point 11 on the camera body side is provided on the coupling surface of the camera
body 1 and the microphone device N2. Therefore, the microphone device 2 is mechanically
coupled to the camera body 1 by means of the hooks 5, 6 and at the same time, the contact U
and the contact piece 0 and the not-shown earth contact and earth contact produce a noise I! ! It
can be connected electrically with the l path. Furthermore, in the microphone device, the
connection terminals 13 connected to the recording circuit are provided on the camera body side
with respect to the contacts of the igIJ, as necessary. When the microphone device 2 is removed
from the camera body 1 between the connection terminals 詔 and 詔, the microphone device 2
can be placed at a distance from the camera body 1 by an electric wire. In FIG. 3, the camera
body 1 and the microphone device 2 contact the ground piece 14 and the ground contact 15
respectively to the contact piece 10 and the contact U by the above-described mechanical
coupling operation, so the microphone unit in the microphone device 2 The audio signal obtained
from 16 passes through an audio signal transmission circuit comprising an attenuation circuit m
and the like in the capacitor 17 history, and is supplied to a known recording circuit 19 provided
on the camera body side with a t'L recording head 20 and a movie film. It is recorded on the
formed airspace. The power source 21 is of a type that supplies a predetermined voltage to the
microphone unit コ ン デ ン サ when a capacitor type element is used as the microphone element
constituting the microphone unit 16. According to this embodiment, the power source 21 is built
in the microphone device 2. is there. It is not necessary to provide the condenser 17 and the
attenuation circuit 18 constituting the above-described audio signal transmission circuit in the
microphone device 2, and part or the whole thereof may be provided on the camera body l side
as shown in FIG. In FIG. 4 in which −g of the circuit configuration of FIG. 3 is changed, the
damping circuit collapse constituting the audio signal transmission circuit is provided between
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the contact U and the switch 3 in the connection terminal, and therefore At the time of insertion,
the microphone device 2 and the recording 101 on the camera body 1 side can be completely
disconnected.
In FIG. 5 in which the circuit configuration of FIG. 4 is further modified, the attenuation @ path
18 for transmitting an audio signal transmission circuit rt is connected between the microphone
unit 16 and the contact a terminal U. The switches 23 connected in parallel are configured so as
to be opened / closed by means of a bin unit that operates when the microphone device 2 is
attached to and detached from the camera body 1. In FIG. 6 in which a part of the circuit
configuration of FIG. 4 is changed, the power supply 21 built in the microphone device 2 is
switched by connecting the operation of the bin 5 to the camera body 1 of the microphone
device 2 The m pressure supply to the microphone unit 16 is configured to be renewed 5. At this
time, the voltage from the power source η in the camera body 1 is supplied to the microphone
unit 16 through the power source contact, the power source contact 9 and the switch 26. The
use of the sound cinema camera according to the invention and its operation will now be
described. In FIG. 2, when the microphone device 2 is attached to the camera body 1 and the
microphone device is used integrally with a movie camera, first, pressing of the fixed five hooks 5
and the locking knob 8 of the microphone device 2 causes rrf 凱7 are inserted into the respective
locking holes of the camera body 1 to mechanically couple the microphone device 2 with the
camera body 1. At this time, the contact point of the microphone device 2 and the ground contact
15 are electrically coupled to the contact piece 10 and the hysteresis contact piece 14 on the
camera body 1 side, and the bin U is controlled to be open by the bin U. Each of the circuits
shown in FIGS. 3 to 5 is configured. Now, if the release operation of the sound movie camera is
performed under the coming condition, the audio signal obtained from the microphone unit 16 is
the capacitor 17 constituting the audio signal transmission circuit, the attenuation 1 circuit, and
the recording (End) 3: 7J can be supplied, so that an audio signal corresponding to the image to
be photographed can be recorded on the movie film similarly to the image by the addition of a
recording head 7J, when recording an audio signal, the audio signal is Noise or vibration
transmitted to the microphone device 2 from the camera body 1 side in order to attenuate the
sensitivity over the entire frequency band or attenuation control of only a limited frequency band
of the audio signal such as, for example, the bass region by the attenuation circuit side of the
signal transmission circuit Sound is attenuated by the audio signal transmission circuit even if
Records g of good speech signals clear degree because it either: possible to.
In the case where the microphone device 22 is removed from the camera body 1 and the
microphone device 2 and the movie camera are used separately, the microphone device 2 is
removed while pressing the locking knob 8 in FIG. A wire (not shown) may be connected between
the connection terminal ν of the separate microphone device 2 and the connection terminal of
the camera body 1. In this case, the attenuation circuit of the audio signal transmission circuit is
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connected or disconnected with the contact point 1 and the contact piece 10 (see FIG. 3, see FIG.
4, or closed by the switch wing or the pin). Because it is ail (see Fig. 5), it becomes inoperative. Of
course, in use, the microphone device 2 is placed at a position separated from the movie camera,
so it is not affected by noise and vibration of the camera ☆ and even if it is not changed in
frequency characteristics by the attenuation circuit. Even the father, the sensitivity of the
microphone device and the ability to record good audio signals without changing it. Father,
according to the circuit configuration of FIG. 6, when the microphone device 2 is attached to the
camera body 1, the power source 21 is cut off by the switch connected to the bin 3 and at the
same time a character from the power source .eta. The power supply is built in the microphone
device 2 in the integrated use of the microphone device 2 and the gorge camera which are
supplied to the microphone units 1 and 6 through the power supply contact path, the power
contact 9 and the switch contact. The power supply 21 is used to record and play audio signals
without being consumed. Incidentally, in the method of using the microphone device 2 described
above, an audio transmission connected between the microphone device 2 and the recording
cycle # 5 in the camera body 1 mainly in relation to the attachment of the microphone device 2
to the camera body l. The frequency characteristics of the circuit or the case of changing the
sensitivity of the microphone device 2 has been described, but it is well known that, for example,
the electronic circuit in this frequency characteristic (microphone unit 16) or the recording
circuit 19 on the camera body 1 side In addition to the transmission characteristics of the circuit
and the attachment and detachment of the microphone device 2 and the camera body 1, the
microphone device 2 itself and the recording circuit 19 itself can be changed. Similarly, the
sensitivity of the microphone device 2 is connected to the electronic device in the microphone
unit 16 or the impedance conversion circuit on the side wj 19 of the camera body 1 side to
connect the microphone device 2 and the camera body 1 separately. L can also be changed as
appropriate.
According to the circuit configuration shown in FIG. 4 and FIG. 6 in the embodiment described
above, the attenuation circuit 18 configured as the audio signal transmission circuit is connected
between the switch terminal of the connection terminal and the recording circuit 1115Lg. Even
when the microphone device 2 is attached to the camera body 1, the attenuation circuit 8 can be
disabled by connecting electric wires. As apparent from the above description, according to the
present invention, an audio signal transmission connecting a microphone device or a recording
circuit on the camera body side or the microphone device and a recording circuit in the camera
body in connection with the mounting of the microphone device on the camera body Since the
frequency characteristics of the g circuit or the sensitivity of the microphone device can be
changed, even when the high sensitivity microphone device M is attached to the camera body
and used, the recorded audio signal is made highly clear. be able to.
4. Brief description of the drawings. FIG. 1 is an external view of the present invention or an
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applied sound recording system EndPage: 4 camera, and FIG. 2 is a main part of a sound movie
camera for explaining an embodiment of the present invention. FIG. 3 is an electrical circuit
diagram showing the electrical configuration of one embodiment of the present invention, and
FIGS. 4 to 6 are electrical circuit diagrams showing the electrical configuration of another
embodiment. 11, 15: electrical contact, 12 = connection terminal (of microphone color 2), 1 B:
"connection (of camera body 1) '4 patent applicant Elmo Co., Ltd. representative Yushin No. 2 Fig.
16 / 7f / Fig. 76/77? i! Fig. 4 EndPage: 5 Fig. 5 Fig. 226-EndPage: 6
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