JPS5855363Y2 - Rotary seat touch - Google Patents

Description

[Detailed description of the invention] The present invention rotates a rotating body comprising a transparent part such as an opening or a transparent part to control light passing through the transparent part such as the opening or transparent part. The present invention relates to a rotary shutter device constructed as described above.

In television cameras that sequentially capture a large number of images in a short period of time, a shutter device using a reciprocating mechanism cannot keep up with high-speed image capturing, and for this reason, a rotary shutter device is preferably used.

In the conventional rotary shutter of a television camera, a metal disc that can be considered a rigid body is used, and the disc is rotated around a rotation axis to pass through an opening formed in the disc. I'm trying to control the light.

However, in a bunch-type television camera, various postures are required depending on the object to be imaged, and there are cases in which the postures must be changed sequentially.

In particular, when the camera must change its attitude and the camera rotates around an axis perpendicular to the axis of rotation of the rotary shutter disc, the rotary shutter disc is rotating at high speed. Therefore, a gyro moment is generated.

The disc therefore undergoes a swinging movement which can come into contact with the wall of the casing in which it is housed, thereby damaging the disc or the casing.

In order to prevent such accidents, it may be possible to make the casing that houses the disc larger and provide a sufficient distance between the disc and the wall of the casing, but this is not possible in terms of space factor and light shielding effect. Not a desirable solution.

The present invention has been made to correct these problems, and includes the following steps: a. A flexible sheet-like body is used as the rotating body, and b The rotating body made of the sheet-like body is moved in the thickness direction of the sheet-like body. In contrast, a rotary shutter device is arranged in a narrow space, and the rotating body is provided with a buffering effect by the air present in the front and back spaces of the rotating body made of the sheet-like body. This is related to.

Therefore, according to the present invention, it is possible to provide a rotary shutter device in which the rotating body does not come into contact with the wall of the casing and is also preferable in terms of space factor.

An embodiment in which the present invention is applied to a shutter device for a television camera will be described below with reference to the drawings.

Figure 1 shows the front of this television camera.
A lens 1 is attached slightly above approximately the center of this front surface.

This lens 1 is screwed into and attached to a pedestal 3 which is fixed to a rectangular outer surface plate 2 covering the front surface of this camera.

As shown in FIGS. 2 and 3, the outer surface plate 2 is formed of a relatively thick metal plate, and is provided with an opening 4 corresponding to the lens 1 to allow light to pass therethrough.

A substrate 5 is disposed inside the outer surface plate 2 described above.

This board 5 is attached to the front of the camera housing,
However, the outer surface plate 2 is supported.

This substrate 5 is also provided with an opening 6.

This frontage 6 is arranged to correspond to the opening 4 of the outer surface plate 2 described above.

A vidicon 7 is provided inside this opening 6.

This vidicon 7 is held by a Bakelite support 8 in the shape of a rectangular parallelepiped.

This support 8 is individually attached to the substrate 5 with screws 9.

A horizontal deflection coil, a vertical deflection coil, and a focus coil are arranged within this support 8.

The support 8 insulates these coils from the substrate 5.

A motor 10 is disposed at the bottom of the vidicon 7.

This motor 10 is a shielded motor and is shielded with permalloy, thereby preventing any magnetic influence from exerting on the vidicon 7 disposed above it.

This motor 10 is fixed to the substrate 5 via a ring-shaped spacer 11.

A pair of ring-shaped support rings 13 are attached to the output shaft 12 of this motor 10.

These support rings 13 are attached via double-sided adhesive tape 14.
．． A flexible circular sheet 15 with a diameter of 12 cm is held between the two.

This sheet 15 constitutes a rotary shutter, and has a pair of openings 16 formed therein.

This creates a shutter effect.

That is, when the opening 16 of the sheet 15 is rotated to a position corresponding to the opening of the outer surface plate 2 and the opening 6 of the substrate 5, the light from the lens 1 reaches the vidicon 7.

This sheet 15 is made of polyethylene terephthalate, and an opaque film is formed on its surface.

Note that the sheet 15 may be made of other polymeric materials or other flexible sheets.

Therefore, the structure is such that light does not pass through the portion other than the opening 16.

Further, the thickness of this sheet 15 is 32μ.

Generally, the thickness of this sheet is preferably within the range of 10μ to 200μ, and more preferably within the range of 25μ to 50μ.

This sheet 15 is a sheet 15 formed on the substrate 5.
It is disposed in a circular recess 17 that is slightly larger than that of the main body.

This recess 17 is closed by the back surface of the outer surface plate 2.

The depth of this recess 17 in the width direction of the sheet 15 is 1.
It is 5mm.

In general, the width is preferably within the range of 0.5 mm to 4 mm, and more preferably 1 mm to 2 mm.

If this width is too small, the torque required to rotate the sheet 15 will increase due to the viscous resistance of the air.

Moreover, if this width is too large, the seats 1-15 will swing during rotation, making it impossible to obtain a good buffering effect by air.

Note that the output shaft 12 of the motor 10 is mounted on the substrate 5 and the outer surface plate 2.
An opening 18 and an opening 19 are provided for escaping the support ring 13, and a cap 20 is attached to the outside of the opening 19 of the outer surface plate 2, thereby closing the opening 19. .

° ・Furthermore, there is a sheet 1 at the bottom of the motor 10.
A sensor 21 is provided for detecting the rotation of 5.

This sensor 21 is composed of a light emitter 22 and a light receiver 23.

An opening 24 is provided in the substrate 5 corresponding to the sensor 21.

On the other hand, a recess 25 is provided on the back side of the outer surface plate 2 at a position corresponding to the opening 24, and this recess 25 has a reflection plate 2.
6 is installed.

Then, the sheet 15 rotates to open the opening 16 and the opening 24.
When the light from the projector 22 reaches the reflection plate 26 through the apertures 24 and 16, it is reflected there and is received by the light receiver 23 through the apertures 16 and 24. There is.

In this way, the number of rotations of the seat 15, that is, the motor 10
The rotation speed of the motor 10 is detected, and this detection signal is used to control the motor 10.
is configured to control the phase of the

Next, the operation of the television camera with the above configuration will be described.

When the motor 10 is rotated by a switch means (not shown),
A circular sheet 15 is fixed to the output shaft 12 of this motor 10 via a support ring 13 and double-sided adhesive tape 14.
rotates.

The sheet 15 is disposed within a four part 17 formed on the substrate 5 and covered by the outer surface plate 2, and since this recess 17 is narrow in the width direction of the sheet 15, it has an air buffering effect. , the gyroscopic moment is effectively blocked, and even if the camera makes a rotational movement about an axis perpendicular to the output shaft 12 of the motor 10, this sheet 15 will not be able to maintain its position on the surface of the recess 17 of the substrate 5 or on the outer surface plate 2. There is no contact with the back.

Moreover, since the width of the recess 17 in the width direction of the sheet 15 is not extremely small, the torque for rotating the sheet 15 does not become large due to viscous resistance of air.

The sheet 15 is rotated so that the opening 16 provided in the sheet 15 comes to a position corresponding to the opening 4 of the outer surface plate 2 and the opening 6 of the substrate 5.

Then, the light from the lens 1 reaches the vidicon 7 and a predetermined image is taken.

Note that the sheet 15 is rotating at 1800 r, p, m, and since the sheet 15 is provided with two openings 16, the vidicon 7 can take images 3600 times per minute, or 60 times per second. I will do it.

Furthermore, when the opening 16 of the sheet 15 comes to a position corresponding to the opening 24 of the substrate 5 in which the sensor 21 consisting of the emitter 22 and the light receiver 23 is provided, the light from the emitter 22 is formed on the outer surface plate 2. The light is reflected by the reflection plate 26 of the concave portion 25 and received by the light receiver 23 .

As a result, the phase of the rotation speed of the motor 10 is detected,
Phase servo of the motor 10 is performed.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above-mentioned embodiments, and can be further modified based on the technical idea of the present invention.

For example, in the above embodiment, an opening 16 is provided in the sheet 15 to control the passage of light.
Alternatively, this portion may be made transparent.

Further, in the above embodiment, the sheet 15 is made of a polyethylene terephthalate film, but it is possible to use various flexible materials for the sheet 15.

Further, the sheet 15 constitutes a rotary shutter, and a signal recording surface is provided on this sheet 15, and a signal recording means for recording a signal on this signal recording surface, such as a recording/reproducing head, is connected to the signal recording surface of the sheet 15. It is also possible to use the sheet 15 as a recording medium for recording signals from the vidicon 7.

As is clear from the above, the present invention configures a rotary shutter using a flexible sheet-like body, arranges this sheet-like body in a narrow space in the thickness direction, and The sheet-like body has a cushioning effect due to the air present on the front and back sides of the seat.

Therefore, according to the present invention, even if the camera rotates about an axis perpendicular to the rotation axis of the rotary shutter, the gyro moment can be effectively prevented by the buffering effect of the air, and for this reason, the sheet-shaped The sheet-like body or the casing will not be damaged due to contact of the body with the wall of the casing.

Further, since the sheet-like body is disposed in a narrow space, the shutter device does not require a large space, which is preferable in terms of space factor.

Furthermore, since the sheet-like body is arranged in a narrow space, it is possible to reduce the distance between the light-receiving portion and the shutter device, thereby improving the light-shielding effect.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a shutter device of a television camera, in which FIG. 1 is a front view of the television camera, and FIG.
II line sectional view, Figure 3 is III-II in Figure 1
It is an I line sectional view. In the reference numerals used in the drawings, 15 is a sheet, 16 is an opening, and 17 is a recess.

Claims (1)

[Claims for Utility Model Registration] A rotary shutter device configured to control light passing through the transparent portion by rotating a rotating body comprising a transparent portion, comprising: a) a flexible rotating body as the rotating body; using a sheet-like body, b disposing a rotating body made of this sheet-like body in a narrow space in the thickness direction of said sheet-like body; A rotary shutter device characterized in that air provides a buffering effect to the rotating body.