JPH08262575A - Spreading and supporting jig for film and sheet - Google Patents

Abstract

PURPOSE: To provide a spreading and supporting jig of a relatively simple construction which is a jig for spreading and supporting films and sheets, such as thin linear Fresnel lens films, having no self-supporting property, and is capable of surely spreading, supporting and fixing the films or sheets in addition, without requiring knack. CONSTITUTION: This spreading an supporting jig is constituted to spread and support the synthetic resin films or sheets having no self-supporting property in a manner as not to wrinkle an slacken the films or sheets. The jig has a frame 110 and holding members 120 for mounting the film 140 or sheet 150 at the frame 110 by holding the films or sheets with the frame 110. At least the frame 110 and the holding members 120 have fitting parts 130 fitting each other via the film 140 or sheet 150. The frame 110 sides of these fitting parts 130 have at least tapered part 133 for pulling the film 140 or sheet 150 in the outside direction of the frame by coming into contact with a part of the holding members 120 while interposing the film 140 or the sheet 150 between the holding members 120 and the frame 110 in the case of fitting via the film 140 or the sheet 150.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch supporting jig for stretching and supporting non-self-supporting films and sheets, and more particularly to a stretch supporting jig for stretching and supporting a lens film used for a projection screen such as a television. Regarding

[0002]

2. Description of the Related Art Conventionally, in a Fresnel lens for a projection screen such as a television, a circular Fresnel lens in which concentric lenses are concentrically formed using a relatively thick sheet that is self-supporting is mainly formed by hot pressing. Molding was performed by using a mold using a UV curable resin. In recent years, a thin lens sheet has been used to reduce deterioration of image quality due to optical loss of the lens,
Due to the demand for continuous production to improve productivity, we have developed a linear Fresnel lens that is formed by arranging lenses in a straight line in parallel.
Those formed on a thin film have come to be proposed. Since the linear Fresnel lens has a linear shape, the UV-curable resin is transferred to a predetermined shape on a continuous thin film by a machine applying a gravure printing machine, A method such as an ultraviolet curing method has been adopted in which the linear Fresnel lens is formed by being cured by. When the linear Fresnel lens film produced in this manner is used for a projection screen, the stretching and supporting method includes a rigid plate, for example, a first method of tying the film to a lenticular lens sheet, a film itself or a frame. A second method of stretching while supporting it on a support such as a cabinet is known,
The second method is superior in terms of thinning the lens sheet and productivity. However, in the case of the second method in which the film itself is stretched while being supported by a support such as a frame or cabinet, it is difficult to secure it securely, and tension is applied to the film without causing wrinkles. It was difficult to continue, and fixing required a lot of tricks. That is, in this second method, it is required to constantly apply tension to the lens film and to easily hold the entire lens film so that wrinkles and slack are not generated. It was For this purpose, first of all, a holding jig capable of securely fixing the lens film was required.

[0003]

As described above, for a thin linear Fresnel lens film having no self-supporting property which is continuously produced in a state for a projection screen,
When stretching while supporting the film itself on the frame, it can be securely fixed, and tension can be applied continuously without generating wrinkles on the film. There was a need for a simple, extension support jig that does not require.

[0004]

Means for Solving the Problems The stretch supporting jig for films and sheets according to the present invention is a stretch supporting jig for stretching and supporting films and sheets made of synthetic resin having no self-supporting property so that wrinkles and slack are not generated. A tool having a frame and a holding member for attaching the film and sheets to the frame by sandwiching the film and sheets with the frame, and the frame and the holding member with the film and sheets interposed therebetween. It has a fitting portion that fits with each other, and at the time of fitting via a film or sheet, at least on the frame body side of the fitting portion, a film or sheet is provided between the holding member and the frame body. It is characterized in that it is provided with a taper portion for contacting a part of the holding member while interposing a sheet or the like and pulling the film or sheet in the outer direction of the frame.
Further, the holding member or the frame body described above is provided with a mold that meshes with a mold formed on the stretched support film or sheets. In addition, the holding member described above is characterized in that it is provided along the entire circumference of the frame body along the frame body to form a second frame body. Further, the frame body and the holding member in the above,
It is characterized in that a rib is provided on a part of the corner portion. Furthermore, the above-mentioned films and sheets are lens films for projection screens.

[0005]

The spreading support jig for films and sheets according to the present invention is configured as described above, and has a relatively simple structure with respect to films and sheets.
It is possible to provide a stretchable support member that can be securely fixed to the sheets without wrinkling and can be continuously tensioned. More specifically, the film and sheet spreading support jig of the present invention has a frame and a holding member for attaching the film and sheets to the frame by sandwiching the film and the sheet with the frame, and And the holding member have a fitting portion that fits with each other via a film or a sheet, and a holding portion is provided on the frame body side of the fitting portion at least when fitted with the film or the sheet. Tension (tension) is ensured by providing a taper portion for pulling the film and sheets outward in the frame, contacting a part of the holding member while interposing the film and sheets between the member and the frame body. It is assumed that you can continue to hang. Further, by providing the holding member or the frame body with a mold that meshes with the mold formed on the stretchable support film or sheets, it is possible to perform more reliable fixing and to continue to apply tension. I am trying. Further, the holding member is provided along the entire circumference of the frame body along the frame body to form the second frame body, whereby the holding member can be more reliably supported. Further, ribs are provided at a part of the corners of the frame and the holding member to prevent the frame and the holding member from being deformed by the expanding force when they are extended and supported. In particular, when the film or sheet is a lens film for a projection screen, it is possible to provide a mold in the portion of the lens film that supports the expansion, even at the stage of producing the lens film, and the expansion support jig having the above configuration is effective. .

[0006]

EXAMPLE An example of a spreading and supporting jig for films and sheets according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a main part of a stretch supporting jig for films and sheets of this embodiment, and FIG. 2 is a plan view of a stretch supporting jig for films and sheets of this embodiment. 3 (a) and 3 (b) are cross-sectional views of the frame body and the holding member in A1-A2 of FIG. 2, respectively, and FIG. 3 (c) is a view showing a mold provided on the holding member. In the figure, 100 is a support jig, 110 is a frame,
120 is a holding member, 130 is a fitting portion, 131 is a convex portion, 1
32 is a concave portion, 133A and 133B are tapered portions, 140
Is a linear Fresnel lens film, 150 is a lenticular lens sheet, 160 is a groove, 170, 180A,
180B is a rib. The extension support jig 100 of this embodiment
Is a jig which is composed of a frame body 110 and a holding member 120, and which holds the linear Fresnel lens film 140 between the front and back sides by stretching the frame body 110 and the holding member 120. In addition, the stretch support jig 100 of the present embodiment also stretches and supports the linear Fresnel lens film 140, and then the frame body 110 and the holding member 1
It is also a jig for inserting the lenticular lens sheet 150 into the groove portion 160 formed when the 20 and 20 are fitted, and integrally manufacturing the projection screen so as to overlap with the linear Fresnel lens film 140. 1A shows a state in which the linear Fresnel lens film 140 is stretched and supported, and FIG. 1B shows a state in which the lenticular lens sheet 150 is inserted in the groove 160 and the linear Fresnel lens film 140 is stretched and supported. It is something that shows things. For the frame 110, it is preferable to use a hard resin such as a thermosetting resin, for example, a phenol resin, a hard polyvinyl chloride, an ABS resin, or the like, from the viewpoint of deformation or the like. For the holding member 120, since the linear Fresnel lens film is fixed while being deformed while tracing the taper portion, a resin having a toughness such as polypropylene is suitable.

In this embodiment, the holding member 120 is the frame body 1.
Along the entire circumference of the frame along 10, the second frame body is formed. In the fitting portion 130 of this embodiment, the frame 110
The holding member 120 and the linear Fresnel lens film 1
A mold 170 as shown in FIG. 3C is formed on the holding member 120 so as to mesh with the mold formed on the linear Fresnel lens film 140 when fitted through 40. Thereby, the frame 110 and the holding member 12
When 0 and 0 are fitted via the linear Fresnel lens film 140, they are firmly supported. The gap between the frame 110 and the holding member 120 in the fitting portion 130 depends on the thickness of the linear Fresnel lens film to be sandwiched, but is preferably about 50 to 90% of the thickness of the sandwiched film.
The mold of the linear Fresnel lens film 140 corresponding to the mold 170 of the holding member 120 was formed together at the time of lens formation, but a mold corresponding to the mold 170 may be provided in another step. .

Next, a method of stretching and supporting the linear Fresnel lens film 140 using the stretch supporting jig 100 for films and sheets of this embodiment will be described below by way of an example. First, the frame body 110 is fixed to a fixed base, and the linear Fresnel lens film 14 is placed on the frame body 110.
Cover with 0. At this time, the linear Fresnel lens film 140 should be free from wrinkles and slack, and the length of the linear Fresnel lens film 140 should reach the D2 portion of the frame 110 shown in FIG. Cover with tension. Next, in this state, the frame-shaped holding member 120 is placed along the frame body 110, and while holding the linear Fresnel lens film 140, the frame-shaped holding member 120 is pushed into the frame body from above by a pressing machine. The linear Fresnel lens film 140 is stretched as it is pushed in. When the holding member 120 is further pushed into the frame body 110 via the linear Fresnel lens film 140 by the press machine, the holding member 120 and the frame body 110 are fitted at the fitting portion 130, and both of them are linear Fresnel lens film. Integrated through 140. Thereby, the linear Fresnel lens film 140 is supported in a stretched state.

When the holding member 120 is pushed into the frame 110 via the linear Fresnel lens film 140, the linear Fresnel lens film 140 is further stretched. The reason is as follows. It will be explained based on. When the holding member 120 starts to be pushed into the frame 110, first, the portion B of the holding member 120 is moved to the frame 110.
It comes into contact with the tapered portion 133B of the holding member 1
The tapered portion 133A of 20 and the tapered portion 1 of the frame 110
33B until they completely contact each other through the linear Fresnel lens film 140, that is, C1 and D of the holding member 120.
1 reaches C2 and D2 of the frame 110 respectively, and the frame 11
The linear Fresnel lens film 1 until the convex portion 131 of 0 and the concave portion 132 of the holding member 120 are completely fitted.
The portion B of the holding member 120 is pushed in along the tapered portion 133B of the frame body 110 while passing through 40. When this is pushed in, the linear Fresnel lens film 1
Since 40 receives a force in the expanding direction, the entire linear Fresnel lens film 140 is further expanded. In addition, in the above, an adhesive may be applied to the plane including the C2 portion of the frame 110 for the purpose of further fixing the linear Fresnel lens film. In addition, D1 of the frame holding member 120 and D1 of the frame 110 are D1 and D2.
A mold may be provided on both of the above or any one of D1 and D2. The mold does not necessarily have to correspond to the film mold for the linear Fresnel lens. Further, the ribs 180A and 180B in FIG. 3 prevent the holding member 120 and the frame 110 from being deformed, but the rib 180B also serves as a pressing portion when pointing the film.

In the embodiment described above, as shown in FIG.
Although it was performed on all sides, it is not always necessary to perform on all four sides. However, it is necessary to carry out stretch support on at least two opposite sides. The taper portion 132 (FIG. 3) of the holding member 120 in the embodiment is not always necessary.

[0011]

As described above, the present invention makes it possible to provide a film and a stretching support jig for sheets that can reliably support the stretching of films and sheets with a simple structure.
In particular, it is possible to provide a stretching support jig that can reliably and easily stretch and support a linear Fresnel lens film that is used for a projection screen and is made of a thin film that does not have self-supporting property.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a main part of a stretch support jig for films and sheets of Examples.

FIG. 2 is a plan view of an example film and sheet spreading support jig.

FIG. 3 is an enlarged cross-sectional view of a fitting portion of a stretch support jig for example films and sheets.

[Explanation of symbols]

100 Extension Supporting jig 110 Frame 120 Retaining agent 130 Fitting part 131 Convex part 132 Recessed part 133A, 133B Tapered part 140 Linear Fresnel lens film 150 Lenticular lens sheet 160 Groove part 170 type 180A, 180B rib

Claims (5)

[Claims] 1. A stretch-supporting jig for stretch-supporting synthetic resin films and sheets which are not self-supporting so as to prevent wrinkles and slacks, and sandwiches the frame body and films and sheets with the frame body. And a holding member for attaching to the frame body, and the frame body and the holding member have a fitting portion that fits with each other via a film or a sheet. On the side of the frame, at least when a film and sheets are fitted together, a part of the holding member is contacted while interposing the film and sheets between the holding member and the frame,
A stretching support jig for films and sheets, wherein a taper portion for pulling the films and sheets toward the outside of the frame is provided. 2. A stretching support jig for films and sheets, wherein the holding member or frame according to claim 1 is provided with a mold that engages with a mold formed on the spreading support film and sheets. 3. The holding member according to claim 1 or 2,
A stretching support jig for films and sheets, which is provided along the entire circumference of the frame and forms a second frame. 4. A stretch supporting jig for films and sheets, characterized in that the frame and the holding member according to any one of claims 1 to 3 are provided with ribs at a part of a corner portion. 5. A spreading and supporting jig for films and sheets according to claim 1, wherein the films and sheets are lens films for projection screens.