JPS5822379Y2 - microphone device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a microphone device suitable for a simultaneous recording type cine camera capable of simultaneously recording image and audio signals.

In a cine camera that allows simultaneous recording, it is necessary to record an image at the time of shooting and at the same time record an audio signal corresponding to the image.

Normally, in this type of cine camera, the operation is extremely complicated, and the microphone device for collecting sound significantly impairs mobility, so the microphone device is often attached to the cine camera body and used as an integral part.

On the other hand, even when the microphone device is attached to the cine camera body and used as described above, if the cable serving as the audio signal transmission means is longer than necessary, the cable may hang down within the shooting angle of view, or operation members such as knobs may During filming, it was necessary to always pay close attention to these types of cables.

In order to eliminate the various drawbacks mentioned above, a microphone device having a configuration as shown in FIG. 1 has recently been provided on the market.

In particular, the microphone device shown in FIG. 1 is configured such that the microphone housing 1 can be attached to and removed from the cine camera body 2, and when the microphone housing 1 is attached, the audio signal picked up by the microphone unit 3 is provided in the microphone housing 1. The audio signal is configured to be directly supplied to, for example, an audio signal recording circuit system 6 provided in the cine camera body 2 via the electrical contacts 4a and 4b provided on the cine camera body 2 side and the electric contacts 5a and 5b provided on the cine camera body 2 side provided in positions that match these. Therefore, it is possible to eliminate various kinds of troubles caused by the above-mentioned cables.

Moreover, according to the microphone device shown in FIG.
The switch member 8 is controlled to open, and the electrical contacts 5 c and 4 provided separately from the electrical contacts 5 b and 4 b are controlled to open.
Since the configuration is such that the power source 9 on the cine camera body 2 side can be supplied to the microphone unit 3 via the power source 9 via c, it is possible to maintain the power source 10 on the microphone housing 1 side in a cut-off state during this time.

By the way, although the microphone device shown in FIG. 1 has various advantages as mentioned above, it also has a special means for using the power source 10 for a long period of time, that is, a switch member 8 that is controlled to open and close on the side of the microphone housing 1. Cine camera body 2
On the side there is a protrusion 7 that engages with the switch member 8. It was necessary to provide the following, which made the configuration itself considerably more complicated.

On the other hand, the present invention relates to an improvement of the microphone device shown in FIG. 1, and its purpose is to simply construct a microphone device having substantially the same functions as those described above.

For this reason, in the proposed device, a diode is interposed between the electrical contacts for supplying power to the microphone housing side and the cine camera body side, and a predetermined level of power is supplied from the cine camera body side by the diode. During this time, the microphone housing is configured to block current flowing from the power supply to the microphone unit.

In particular, according to the microphone device of the present invention, since a diode is used in place of the above-described switch member, the entire configuration can be significantly simplified, and the reliability of the device can be further improved.

The microphone device of the present invention will be explained below with reference to an embodiment shown in FIG.

The microphone device shown in FIG.
A diode 11 is connected between a power source 10 provided on the microphone unit and an electric contact 4C for supplying a power source 9 on the cine camera body (2: see FIG. 1) side to the microphone unit.

In particular, the microphone device shown in FIG. 2 is not particularly different from the microphone device shown in FIG. 1 except that the switch member 8 is replaced with a diode 11, so for convenience, the same reference numerals as in FIG. 1 are used for the same components. It is attached.

The jack 12 connects the microphone housing 1 to the cine camera body 2.
This is used when used separately from the microphone unit 3, and when a cable is interposed between the microphone unit 3 and the jack 13 on the cine camera body 2 shown in FIG. 6 can be supplied.

Note that the switch 14 is a main switch and is kept open when the microphone device is not used.

Next, the operation of the microphone device of the present invention will be explained.

When performing simultaneous recording, the microphone housing 1 shown in FIG. 2 may be attached to the cine camera body 2 shown in FIG. 1 and used in an integrated manner.

When mounted in this manner, the electrical contacts 4a, 4b, 4C formed on the microphone housing 1 side are connected to the electrical contacts 5a, 5b, 5C on the cine camera body 2 side, so the power source 9 on the cine camera body 2 side is connected to the electrical contacts 5c, 4c Further, it is supplied to the microphone unit 3 via electrical contacts 5b, 4b which serve as the ground, and the audio signal picked up by the microphone unit 3 is further supplied to the electrical contacts 4a, 5a and further to the electrical contacts 5b, 4b. The signal is then supplied to the audio signal recording circuit system 6 provided in the cine camera body 2.
Simultaneous recording of image and audio signals becomes possible.

In particular, in the present microphone device, the power supply 10 on the side of the microphone housing 1 is supplied to the microphone unit 3 via the diode 11, but when installed as described above, the cine camera body 2 is connected to the anode side of the diode 11. Since the side power supply voltage is directly applied,
During this time, the diode 11 is in an off state.

Therefore, when the microphone housing 1 is mounted, the power supply 10 on the side of the microphone housing 1 is controlled to be cut off, and consumption of the power supply 10 can be reliably prevented.

On the other hand, when the microphone housing 1 is used separately from the cine camera body 2, a cable of a predetermined length may be connected between the jack 12 on the microphone housing 1 side and the jack 13 on the cine camera body 2 side.

At this time, the electrical contacts 4a and 4b. 4C is electrical contact 5a
, 5b, and 5C, no power supply voltage is applied to the anode side of the diode 11.

Therefore, the power source 10 on the microphone housing 1 side is supplied to the microphone unit 3 via the diode 11, and at the same time, the audio signal picked up by the microphone unit 3 is supplied to the audio signal recording circuit system 6 via the cable. Ru.

As described above, the microphone device of the present invention is extremely effective in practice because it can reliably reduce the consumption of the power source 10 using a single diode 11.

In the present invention, the power supply voltage supplied from the power supply 9 to the microphone unit 3 needs to be higher than that of the power supply 10.

Further, it is preferable to use a germanium diode as the diode 11, which has a relatively small forward voltage drop.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a circuit diagram of a conventional microphone device, and FIG. 2 shows a circuit diagram of the microphone device of the present invention. 1: Microphone housing, 2: Cine camera body, 3: Microphone unit, 4b, 4C, 5b, 5C: Electrical contacts, 9, 10: Power supply, 11: Diode.

Claims (1)

[Scope of utility model registration request] In a microphone device that is detachable from the cine camera body and configured to supply power from the cine camera body side to the microphone unit through electrical contacts formed on each of the cine camera body and the microphone casing when attached, the microphone casing By interposing a diode between the built-in power supply and an electrical contact for supplying power to the cine camera body, when power is supplied from the cine camera body to the microphone unit, the power supply to the microphone casing side is controlled. The microphone device configured to perform cut-off control.