JPH08154152A - Film holding device on rotary disk - Google Patents

Abstract

PURPOSE: To easily attach and detach a film and to flatly hold the entire film by providing a rotary disk provided with plural through-holes and a specified air pressure adjustment means. CONSTITUTION: The plural through-holes 20 are formed at the part for arranging a film source document 6 of the rotary disk 2. An approximately cylindrical container 22 is provided on the lower side of the rotary disk 2. Further, to the lower side of the container 22, an exhaust pipe 24 is connected and it is connected to a vacuum pump 26. Then, the inner part of the container 22 is exhausted by the vacuum pump 26. Thus, an air pressure becomes lower on a lower side main surface side than the upper side main surface side of the rotary disk 2 and the film source document 6 is sucked and held by the through- holes 20 on the surface of the rotary disk 2 by the pressure difference. Thus, by controlling the vacuum pump 26, the film source document is easily attached and detached. Also, since the film original 6 is sucked by the plural through- holes 20 provided on the rotary disk 2, the film source document 6 becomes flat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating disk film holding device suitable for a device for holding a film on a rotating disk and scanning the film to read or record an image.

[0002]

2. Description of the Prior Art FIG.
FIG. 3 is a perspective view of an apparatus disclosed in the specification and drawings of Japanese Patent Application No. 6-73899 “scanner apparatus” previously filed by the applicant of the present application. A film original 6 is placed on the upper surface of the first disc 2.
Is a scanner device for reading an image with an optical reading device provided on the upper support 14 of the slide support mechanism 12 while irradiating the original with light and transmitting light or reflected light. A precise spiral track is formed on the surface of the second disk 8, and the spiral track is formed on the lower support portion 16.
Accurate position adjustment is performed by tracing with an optical position detector provided in the. Further, in this apparatus, as shown in FIG. 4, an embodiment is also disclosed in which a notch portion is formed in a part of a disc so that a document holder can be attached and detached, which facilitates the work of exchanging and pasting a document. ing.

However, this device does not disclose how to attach a film original to the surface of the disk 2 or the surface of the original holder 5. Usually, a transparent adhesive tape or the like may be used for attachment, but attachment and detachment of the film original is inconvenient, and there arises a problem that dust easily attaches to the adhesive area. Moreover,
Even if only the peripheral portion of the film original is fixed with an adhesive tape, the entire film original is not flat and the read image is distorted.

It is an object of the present invention to provide a film holding device on a rotating disk, which is very easy to attach and detach the film on the rotating disk and which can hold the entire film flat.

[0005]

A film holding device for a rotating disk according to the present invention is rotatable about a central axis and is located at a predetermined position on a first main surface for holding a film.
A rotary disk having a plurality of through holes between the main surface and the main surface; and an air pressure adjusting means for maintaining the air pressure on the second main surface side of the disk lower than the air pressure on the first main surface side. To do.

The atmospheric pressure adjusting means has a first opening which surrounds the vicinity of the outer periphery of the rotary disk in a non-contact manner, and a second opening which surrounds the circumference of the central axis of the disk in a non-contact manner.
It is characterized by including a container having an inner space on the side of the second main surface of the disc and an exhaust unit for exhausting the inner space of the container.

As another embodiment, the air pressure adjusting means includes a cylindrical guard surrounding the outer periphery of the rotating disk in a non-contact manner,
And a propeller provided on the central axis on the second main surface side of the rotating disk.

[0008]

1 is a partial sectional view showing the construction of an embodiment of a film holding device on a rotary disk according to the present invention.
Parts corresponding to the device of FIG. 3 are given the same reference numbers. Further, parts that are not directly related to the configuration of the present invention are omitted for convenience of explanation. In FIG. 1, a plurality of through holes 20 are formed in the portion of the rotary disc 2 where the film original 6 is placed. It is desirable that the through holes 20 be formed at the peripheral portions of the film original 6 while avoiding the image area. Although not shown, the film original 6 is used to hold the film original 6 at a predetermined position.
It is desirable to provide positioning protrusions at four corners, for example. Further, a substantially cylindrical container 22 is provided below the rotating disk 2.
Is provided. This container 22 has two openings,
The first opening is at the upper end of the container 22 and
Is a circular opening that surrounds the vicinity of the outer periphery of the contactless body. The distance between the inner wall of the first opening of the container 22 and the outer circumference of the rotary disk 2 should be short as long as they do not come into contact with each other.
The second opening of the container 22 is provided in the lower central portion, and the rotary shaft 4 penetrates the second opening. This second
The distance between the inner wall of the opening and the outer circumference of the rotary shaft 4 is preferably as short as possible unless they come into contact with each other.

An exhaust pipe 24 is connected to the lower side of the container 22 and is connected to a vacuum pump 26. Since the inside of the container 22 is evacuated by the vacuum pump 26, the rotating disk 2
2, the pressure is lower on the lower main surface side than on the upper main surface side.
Due to this atmospheric pressure difference, the film original 6 is adsorbed and held on the surface of the rotary disk 2 by the through hole 20. Vacuum pump 2
By controlling 6, the film original can be attached and detached very easily, and the trouble of pasting with an adhesive tape as in the past can be eliminated. Further, since the film original 6 is adsorbed by the plurality of through holes 20 provided in the rotary disk 2, the air below the film original 6 is evacuated and the whole film original 6 sticks to the surface of the rotary disk 2, so that the film original film 6 is sucked. The original 6 becomes flat, and the image distortion due to the partial curvature of the film original does not occur unlike the conventional case.

FIG. 2 is a partial sectional view showing another embodiment of the present invention. The same elements as those in FIG. 1 are designated by the same reference numerals. In this embodiment, a cylindrical guard 28 that surrounds the periphery of the rotary disk 2 is provided. Further, a propeller 30 is provided on the central shaft 4. With this configuration, when the central shaft 4 rotates, the rotating disk 2 and the propeller 30
Since they rotate together, the pressure of the lower side of the rotary disk 2 is lowered by the action of the guard 28 and the propeller 30, and the film 6 can be adsorbed to the upper surface of the rotary disk 2 through the through hole 20. In this embodiment, since the force of adsorbing the film 6 is weak while the rotation speed of the propeller 30 is low, the four corners of the film 6 on the upper surface of the rotating disk 2 are prevented from being blown off by the centrifugal force. It is desirable that the film 6 be easily held by providing a projection on the. The suction force increases as the rotation speed increases, and the film 6 is reliably held on the surface of the rotating disk 2.

The present invention is suitable for an apparatus for holding a film on a rotating disk and can be applied not only to the scanner apparatus shown in FIG. 3 but also to the image recording apparatus previously filed by the applicant of the present application. is there. This image recording device is a machine for holding a photographic film, which is a photosensitive medium, on a rotating disk, irradiating a light beam based on image data on the photographic film, and recording an image. The general structure is the same as that of the scanner device of FIG.

[0012]

The film holding device for a rotating disk of the present invention can be easily attached and detached without using an adhesive tape or the like, and the film can be surely adsorbed to the disk surface through the through hole, so that the film surface is flat. Therefore, the distortion of the image can be reduced when reading the image from the film or writing the image on the film.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of the preferred embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of another embodiment of the present invention.

FIG. 3 is a perspective view of a scanner device using a conventional rotating disk.

FIG. 4 is a perspective view showing another conventional example of the rotary disk of the apparatus of FIG.

[Explanation of symbols]

 2 rotating disk 4 central axis 6 film 20 through hole 22 container 24 exhaust pipe 26 vacuum pump 28 cylindrical guard 30 propeller

Claims (3)

[Claims] 1. A rotating disk rotatable about a central axis and having a plurality of through holes between the first main surface and the second main surface at predetermined positions of a first main surface holding a film, A film holding device on a rotating disk, comprising: an air pressure adjusting means for maintaining the air pressure on the second main surface side of the disk lower than the air pressure on the first main surface side. 2. The atmospheric pressure adjusting means has a first opening that surrounds the vicinity of the outer periphery of the rotating disk in a non-contact manner, and a second opening that surrounds the circumference of the central axis of the disk in a non-contact manner.
2. The rotating disk on-film holding device according to claim 1, further comprising a container having an inner space on the side of the second main surface of the disc and an exhaust unit for exhausting the inner space of the container. 3. The atmospheric pressure adjusting means includes a cylindrical guard that surrounds the vicinity of the outer circumference of the rotary disk in a non-contact manner, and a propeller provided on the central shaft on the second main surface side of the rotary disk. The film holding device on a rotating disk according to claim 1, wherein: