JPH0219799B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention stores long strip films such as microfilm, negative film, positive film, etc., organizes and preserves them, and also monitors the storage state. The present invention relates to a film jacket suitable for use in projecting film images, for example, with an overhead type projector, while maintaining the image quality.

BACKGROUND OF THE INVENTION Known film jackets for storing long strip films are generally classified into two types as described below.

One of them, as shown in FIG.
are joined in the length direction over a distance approximately equivalent to the entire length of the strip film A, and the width W of the film storage section C formed between the adjacent joints B and B is set to be smaller than the width w of the strip film A. The other type is a so-called loose type film jacket, which is made considerably wider, and the other type is a so-called closed type film jacket, in which the width of the film storage section is slightly larger than the film width.

(Problems to be Solved by the Invention) Here, in the loose type film jacket, since the width W of the film storage section C is considerably wider than the film width W, it is easy to insert the long slide film A therein. Although there are certain advantages, it is not possible to accurately specify the film position in the storage section C in the length and width directions, and for this reason, for example, a film jacket containing positive film cannot be placed in an overhead type projector. When projecting a film image by attaching it to a projector, it is virtually impossible to always reliably position the center of the positive film on the optical axis of the projector and to completely eliminate the tilt of the image. In addition to this problem, there was also the problem that the strip film A would fall off while the film jacket was being carried.

On the other hand, in a closed-type film jacket, the difference between the width of the film storage section and the film width is small, so once a long strip film is inserted into the storage section, a loose-type film jacket cannot be used. Although the same problem as in the case of the film does not occur, it is difficult to insert the strip film into the film storage section, and even if there is a slight difference between the direction of insertion and the direction in which the film storage section extends, the leading edge of the film may There was a problem in which the corners caught on the joint between the front and back plates, causing the film to bend. This problem is particularly serious in endoscopic films, microfilms, etc., where the film width is smaller than the film length.
Special auxiliary equipment is required to insert this type of film into its storage, which makes the film insertion process even more cumbersome.

The present invention advantageously solves the problems of the prior art by making it extremely easy to insert a long strip film, and to keep the long strip film in place after insertion. To provide a film jacket that can be held securely.

(Means for Solving the Problems) The film jacket of the present invention is particularly characterized in that the long strip film storage section is provided with a large distance in the length direction of the film to be stored therein. two short joints of plastic front and back plates that contact one side edge in the width direction of the film;
Front and back plates are provided at a distance corresponding to the width of the film from these short joints in the width direction of the film, fall within the distance between the short joints, and are in contact with the other side edge of the film in the width direction. It is formed between a short length or a long length joint.

(Function) In this film jacket, the joints on each side of the film that form the film storage section are such that when a long strip film is inserted, the film is closed only at positions where the joints on the opposite side do not come into contact with the film. In other words, the joints on both sides of the film come into contact with each side edge of the film at positions spaced apart in the length direction of the storage section, so that there is Even if they differ somewhat, their insertion will not be impeded by the abutment between the joint and the distal corner of the film;
Therefore, the film will not be bent. When the film is finished being inserted, for example, the film is rotated to the side opposite to the side where the film is allowed to tilt until the rotational movement of the film is restrained by the joint, and then the film is inserted. By matching the direction with the extending direction of the storage section, the film can be easily and reliably stored in a predetermined position. In this stored state, since the distance between the joints in the film width direction is equivalent to the film width, the movement of the film in the width direction is due to contact between the joints and the film width, and also in the length direction. This movement is effectively prevented by the frictional forces exerted on the film by the joint and the front and back plates.

(Example) The present invention will be explained below based on illustrated examples.

FIG. 1 is a plan view showing an embodiment of this invention.
In the figure, 1 and 2 indicate the front plate and the back plate, respectively.
These front plate 1 and back plate 2 are, for example,
It is formed by folding back a transparent plastic sheet from approximately the center. It goes without saying that the front and back plates 1 and 2 may be formed from two completely separated sheets.

Here, the front and back plates 1 and 2 are bonded over a short distance by adhesive, heat fusion, etc. at two locations that are widely separated in the length direction of the long strip film 3 to be stored. , these short joints 4,4
contactable with one side edge of the strip film 3, and spaced apart from these short joints 4, 4 in the width direction of the film by a distance corresponding to the width thereof,
In addition, for example, a short joint portion 5 of the front and back plates 1 and 2 is provided within the distance between the short joint portions 4 and 4,
A storage portion 6 for the long strip film 3 is formed between these joint portions 4 and 5. Here, the distance between the short joint portion 5 and the short joint portions 4, 4 is the distance between the short joint portion 5 and the short joint portions 4, 4.
Since the short joint portion 5 contacts the side edge in the width direction of the film 3 inserted into the storage portion 6, the width thereof is restricted.

In addition, in the drawings, FIG. 1a shows one short joint 5 at the center position between both joints 4, 4, and FIG. 1b
1 has two short joints 5, 5 provided at both end portions between both joints 4, 4, and FIG. 1c shows the two short joints 5, 5 shown in FIG. 5, 5 are made continuous with each other to form a long joint 7, and both of these joints 5, 7 directly cooperate with the joint 4 to extend the width of the film 3. It acts to reliably restrict movement in the direction.

In the figure, 8 indicates a binding hole provided at the folded end of the plastic sheet, and 9 indicates a film insertion slot provided between the free ends of the front and back plates. This can be easily achieved by shifting the edge position of either one of the face plates 1, 2 toward the punching hole 8 side.

According to the film jacket constructed in this way, when the long strip film 3 is inserted into the storage section 6 from the film insertion opening 9, the joints 4 and 5 or the joints 4 and 7 are connected to the storage section. 6 are spaced apart in the length direction of the film 3 so as to be in contact with each side edge of the film 3, so that the insertion resistance of the film 3 is small and the insertion is easy, and as shown in FIG. Even if the direction of insertion of the film 3 and the direction of extension of the storage section 6 somewhat coincide, the leading end corner of the film 3 does not come into contact with the joint, which causes problems such as bending of the film 3 and the inability to insert it. will not occur. When the insertion of the film 3 is finished, if the insertion direction and the extension direction of the storage section are the same, the film 3 can be pushed in the same position until it reaches the end of the storage section, while the film insertion direction is If the film 3 is tilted with respect to the direction in which the part extends, the film 3 is rotated to the opposite side to the tilted side, and the rotational movement causes the film 3 to move toward the joint part 5 or
By pushing the film 3 into the end of the storage section while maintaining the film posture, the long strip film 3 is completely stored in the predetermined position. It will be held in

The film 3 inserted into the storage section 6 in this manner is moved in the width direction under the cooperation of the joints 4 and 5 or the joints 4 and 7, which are provided at intervals approximately equal to the width of the film. The movement of the film 3 is surely restrained, and the movement of the film 3 in the length direction is
Bonded portions 4 and 5 or bonded portions 4 and 7 to film 3
Since this is sufficiently prevented by the frictional force exerted by the front and back plates 1 and 2, the strip film 3 can be effectively positioned at a predetermined position. Therefore, when carrying the film jacket, the long strip film 3 does not fall out of the storage section 6, and moreover, when projecting the image on the film 3 in the film jacket, it remains in a predetermined position on the screen. An erect image can always be ensured.

FIG. 3 is a partially enlarged plan view showing another embodiment of the present invention. At least one of the face plates 1 and 2 has a joint portion 4, as indicated by diagonal lines in the figure.
5 and 7, and is provided with a light shielding or light attenuation zone 10 extending in the length direction of the film 3.

In this example, in particular, the attenuation zone 10 completely covers the perforation area of the long strip film 3 which is securely positioned in the storage part 6, so that the image of the film 3 stored in the film jacket can be , when checking with the eye through light, the light passing through the perforated area of the film 3 does not interfere with the work, and when projecting the film image, the light passing through the perforated area does not interfere with the illuminance on the screen. It does not abnormally increase the image quality and does not interfere with image viewing.

Although this invention has been described above based on illustrated examples,
When the main purpose is to organize and preserve long strip films, the back plate is made of a milky white material, and the light rays that pass through it and are diffused make it easier to preview the film image. be able to. It is also possible to divide each joint 4 in the illustrated example into two or more point joints, or to provide separate point or short joints at the outer positions of the joints 4,4.

(Effects of the Invention) Therefore, according to the present invention, in particular, by making contact with each side edge in the width direction of the film and separating the joint portions by a distance corresponding to the width of the film, the film inserted into the storage portion is , it can be reliably maintained in a predetermined position by the frictional force between the joint and the front and back plates. In addition, the joints that contact one side edge of the film are separated by a large distance in the length direction of the film, and the short or long joints that contact the other side edge of the film are kept within the spacing of the other joint. By placing the joints on both sides of the film in contact with each side edge of the film at positions spaced apart in the length direction of the storage unit, the film can be misaligned in the insertion direction and the extension direction of the storage unit. Even if this occurs, the insertion of the film is sufficiently ensured, so that the insertion operation can be performed extremely easily and efficiently.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the film insertion state, FIG. 3 is a partially enlarged plan view showing another embodiment of the invention, and FIG. 4 is a conventional FIG. 3 is a plan view showing an example. DESCRIPTION OF SYMBOLS 1...Front plate, 2...Back plate, 3...Long strip film, 4, 5, 7...Joint part, 6...
Storage section, 9...Film insertion slot.

Claims (1)

[Scope of Claims] 1. A front plate and a back plate made of a plastic sheet, a storage area for a long strip film formed by joining these front and back plates, and a storage area for storing a long strip film in this storage area. In a film jacket equipped with a film insertion opening that allows insertion, the storage section is provided with a large distance in the length direction of the long strip film to be stored therein, and the storage section is provided with a large distance in the length direction of the long strip film to be stored therein. Two short joints of the front and back plates that contact one side edge in the width direction, and a distance corresponding to the width of the long strip film from these short joints in the width direction of the long strip film. and a short or long joint of the front and back plates located between the two short joints.