JPH0728776Y2 - TV video camera viewfinder - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a viewfinder of a TV video camera.

"Problems to be solved by conventional technologies and devices" Recent TV video cameras are so-called electronic viewfinders in which the captured video signal is reproduced on a liquid crystal display board and the photographer looks through it through a lens. Is equipped with.
The lens of this finder is usually formed by combining one convex lens and one concave lens (Fig. 5A), and these lenses are housed in a removable lens barrel, and an annular lens is attached to the tip of the lens barrel. A rubber cup is provided so that the user can peep at the rubber cup by putting his or her eyes on it. In general, an earphone jack connected to an audio circuit is provided so that sound can be listened to by a monitor by an earphone, and a power jack connected to a power line is provided to supply power to various accessory devices.

However, when shooting, you have to put your eyes on the rubber cup and peek at the viewfinder image that appears on the LCD panel, so you need to attach a video camera to a tripod and follow the subject. , It is not easy to follow the body with a video camera that turns on a tripod. Moreover, it is difficult to attach and detach the earphones, and it is difficult for several people to simultaneously observe the shooting situation and listen to the audio monitor.

By the way, there is one in which an eye cup is rotatably attached to a finder, one side of the eye cup is extended to a position close to a photographer's ear, and an earphone is attached to the extended portion (actually, Kaisho) No. 52-116225). In this case, when the photographer looks at the eye cup and looks into the viewfinder, the earphone is located at the ear position, and therefore the trouble of attaching and detaching the earphone is eliminated.

However, this makes it more and more difficult for several people to observe the shooting situation and listen to the sound on the monitor at the same time. Furthermore, sometimes the extended part of the eye cup becomes an obstacle, and even it feels inconvenient. Occurs.

In addition, it is also possible to attach a plurality of interchangeable lenses with different magnifications to the viewfinder so that they can be freely attached and detached.
If the magnification is selected, it is possible for several people to observe the shooting situation at the same time.

However, only with this, it is not possible for all the observers to listen to the sound on the monitor, and it is not possible to take an image with appropriate sound.

In consideration of these points, the present invention intends to allow a few people to simultaneously observe the shooting situation and listen to the sound monitor, and at the same time, to provide a compact and simple finder. Is.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a box-shaped lens barrel 1 which is detachably attached to a finder base portion a of a video camera A, and a plurality of persons can be installed in the lens barrel. The combination magnifying lens 2 that can be seen is provided inside, and flat vacant chambers are formed along the peripheral wall in a part of the peripheral wall of the lens barrel 1 and in the other part, respectively, and one of the vacant spaces is a flat and small size. The printed wiring board 41 of the amplifier circuit 4 is built in, and the cables 51, 61 with connection plugs 52, 62 for voice input and power supply are pulled out of the lens barrel 1 from the input end of the printed wiring board and the power supply line. The other vacant room,
The speaker grill 17 is formed on the outer surface, the flat small speaker 3 is placed inside the speaker grill 17 as a body surface, and the small speaker is electrically connected to the output end of the printed wiring board 41. Characterize.

"Operation" Due to the above-mentioned configuration, when the video camera A is mounted on a tripod or when it is desired to photograph the photographing situation by several people, the conventional lens barrel b is replaced with the lens barrel 1 of the present invention, Insert the connection plug 52 of the input cable 51 into the earphone jack f of the video camera A and connect it to the audio circuit d,
Further, the connection plug 62 of the power supply cable 61 is inserted into the power supply jack g of the video camera A to be connected to the line of the power supply e.

As a result, the combination magnifying lens 2 magnifies the finder image and enables one or several people to observe it as a large image a few centimeters to several tens of centimeters backward, and at the same time, the amplifier circuit 4 causes the video camera A The audio signal for the earphone output from the audio circuit d is amplified to a required size, and the amplified output is converted into sound by the small speaker 3,
Have one or a few people around you listen.

[Examples] The drawings show examples of the present invention.

In the figure, 1 is a box-shaped lens barrel in the front-rear direction detachably attached to a finder base portion a facing the rear of the video camera A, 2 is a combination magnifying lens installed in the lens barrel,
Reference numeral 3 is a small speaker installed in the lower part of the lens barrel, 4 is an amplifying circuit installed in the upper part of the lens barrel, and 5 and 6 are respective connecting means between the input end of the amplifying circuit and the green system.

In the lens barrel 1, an outer cylinder 12 is connected to a base cylinder 11 that is detachably fitted to the outer edge of the finder base a, and a fitting rubber piece 13 is attached to the inner side of the base cylinder 11. Inner tube 14 inside 12
The outer and inner cylinders are the upper and lower pieces 141, 141 protruding from the base cylinder 11.
And both side pieces 142, 142 provided on the outer cylinder 12 are fitted together.

Further, the lens barrel 1 forms a flat empty space along the peripheral wall at the upper and lower portions of the peripheral wall, that is, a flat space between the outer cylinder 12 and the inner cylinder 14, and one side surface. A knob window 15 is provided in the upper part of the above, and a cable outlet 16 is provided in the lower part, and the speaker grill 17 is provided on the lower surface of the outer cylinder 12 so as to correspond to the above-mentioned empty room.
Is formed.

The combination magnifying lens 2 is composed of a convex lens 21 and a concave lens 22 formed of a synthetic resin such as acrylic resin. Flanges 211 and 221 are provided on the periphery of these lenses, and the convex lens 21 is provided at the rear end of the inner cylinder 14 and The concave lens 22 is arranged at the front end of the inner cylinder 14 and is welded to the inner cylinder 14 at the flanges 211 and 221 by ultrasonic waves, a solvent, or the like.

The small speaker 3 is small and thin, and the inner cylinder 14
Inside the lens barrel 1, the speaker grill 17 is faced downward.

The amplifier circuit 4 is formed on the printed wiring board 41, and is mounted inside the lens barrel 1 above the inner cylinder 14. Further, the amplifier circuit 4 is provided with a sound adjusting volume 42, and the knob 43 of the outer volume is exposed in the window 15 for knob of the lens barrel 1.

Thus, the output end of the amplifier circuit 4 is connected to the small speaker 3 via the lead wires 31 and 31, and the connecting means 5 and 6 are provided at the input end and the power supply line, respectively (see FIGS. 4 and 6). Figure). These connecting means 5 and 6 connect the ends of the cables 51 and 61 to the input end and the power supply line, respectively, draw the cables out from the cable outlet 16 of the lens barrel 1, and connect the plugs 52 and 62 to the ends, respectively. Is provided. In the figure, 7 is a cord bush fitted in the cable outlet 16,
It is molded integrally with the insulation coating.

With the above-mentioned configuration, when using, the conventional lens barrel 6 attached to the video camera A is removed, and the lens barrel 1 of the present invention is fitted to the outer edge of the finder base a by the base barrel 11. , The connection plugs 52 and 62 of the connecting means 5 and 6 are respectively connected to the earphone jack f connected to the audio circuit d of the video camera A and the power jack g connected to the power supply e (6th
After that, the volume of the sound output from the small speaker 3 is appropriately adjusted with the knob 42, the image appearing on the liquid crystal display plate c in the finder base a through the combination lens 2 is observed, and the sound is output from the small speaker 3. Just listen.

In this case, the viewpoint is considerably receded (FIG. 5B) from the conventional one (FIG. 5A), and the image is considerably enlarged.
The receding of the viewpoint is preferably about 15 cm.

"Effect of Device" According to the present invention, the following effects are obtained.

Since the magnifying lens 2 that can be seen by a plurality of people is installed in the box-shaped lens barrel 1 which is detachably attached to the finder base portion a of the video camera A, the finder image can be viewed from several centimeters to several tens of centimeters by the outer magnifying lens 2. The image can be magnified and observed at a distance of a centimeter, and therefore, it is possible to observe with a large and easy-to-see image not only by one person but also by several persons simultaneously.

The printed wiring board 41 of the amplifier circuit 4 is provided in the peripheral wall of the lens barrel 1.
And the small speaker 3 connected to this is installed inside, and the cables 51 and 61 with connection plugs 52 and 62 for voice input and power supply are pulled out of the lens barrel 1 from the input end of the printed wiring board and the power supply line. Since these connection plugs 52 and 62 can be easily connected to the earphone jack f and the power supply jack g of the video camera A, no additional amplifier, speaker, power supply device, etc. are required. With the amplifier circuit 4 to the small speaker 3, the voice collected by the video camera A can be listened to by the monitor without any trouble even by one person or several persons at the same time. Therefore, all the participants can monitor the voice while observing the viewfinder image. Can be done in
You can achieve the best shooting situation.

A flat vacant chamber is formed along the peripheral wall in a part of the peripheral wall of the lens barrel 1 and another part thereof, and a flat and small printed wiring board 41 of the amplification circuit 4 is provided in one of the vacant spaces. Since the speaker grill 17 is formed on the outer surface of the other room and the flat small speaker 3 is housed inside the speaker grill 17, the viewfinder having the printed wiring board 41 and the small speaker 3 is provided. Can be compactly and simply formed.

Since the viewfinder image can be observed with the eyes sufficiently separated from the viewfinder, even when the video camera A is attached to a tripod and the subject is tracked, the body of the video camera A, which rotates based on the tripod, must be positioned. It can be easily followed, and shooting is extremely easy.

Since the lens barrel 1 does not have a special protruding portion, the protruding portion does not interfere with use.

[Brief description of drawings]

1 is a perspective view of a state of use, FIG. 2 is a side view, FIG. 3 is a cutaway side view, FIG. 4 is an exploded perspective view, and FIG. FIG. 6 is an optical path explanatory diagram, and FIG. 6 is a block diagram of an electric circuit. 1 ... Lens barrel, 2 ... Combination magnifying lens, 3 ... Small speaker, 4 ... Amplifying circuit, 5,6 ... Connecting means, 17 ...
Speaker grill, 41 ...... Printed wiring board, 51,61 ...
… Cables, 52, 62… Connection plugs, A… Video cameras

Front page continuation (72) Inventor Mitsuo Takanaga 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Mikio Isoda 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Kunio Niwa 3000 Mita, Atsugi, Kanagawa Prefecture, in Eko, Inc. (72) Inventor Norihiko Takushima 3000 Mita, Atsugi, Kanagawa, Ltd., in Eko, Inc. (72) Inventor, Hironori Hayashi, Mita 3000, Atsugi, Kanagawa In-house company (72) Inventor Makoto Sugawara 3000 Mita, Atsugi-shi, Kanagawa Prefecture In-house company (56) References: 63-41134 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A box-shaped lens barrel 1 which is detachably attached to a finder base portion a of a video camera A, and a combination magnifying lens 2 which can be seen by a plurality of persons is provided in the lens barrel.
A flat vacant chamber is formed along the peripheral wall in a part of the peripheral wall of the lens barrel 1 and another part thereof, and a flat and small printed wiring board 41 of the amplification circuit 4 is provided in one of the vacant spaces. At the same time, the cables 51 and 61 with connection plugs 52 and 62 for voice input and power supply are pulled out of the lens barrel 1 from the input end of the printed wiring board and the power supply line. -The grill 17 is formed so that the flat small speaker 3 faces the speaker grill 17 and is internally mounted, and the small speaker is electrically connected to the output end of the printed wiring board 41. TV video camera finder.