JP3502183B2 - Extension support jig for films and sheets - Google Patents

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 which is continuously produced for a projection screen and has no self-supporting property, it is necessary to stretch the film while supporting the film itself on a frame. There is a need for a simple extension support jig that can be securely fixed, that can continue to apply tension without causing wrinkles on the film, and that does not require any tips for fixing. Was there.

[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, which comprises a bent portion that bends toward the groove side in the groove portion and a fixed portion that does not bend, and the bent portion and the fixed portion are fitted to each other via a film or sheet by bending the bent portion. The first claw portion for extending and supporting the film and sheets and the second claw portion for maintaining and fixing the folded state are formed on at least the folding portion side of the fitting portion. A claw portion is provided, and on the fixed portion side of the fitting portion, a first lock portion having a taper portion and formed of a convex portion that meshes with the first claw portion, and a hook groove that meshes with the second claw portion are formed. With the second lock part When the film and sheets are stretched and supported by bending the bent portion, the first claw portion holds the film and sheets with the taper portion provided in the fixed portion and rotates by a rotational force. Bend it so that it is locked by the first lock part consisting of the convex part when it is expanded and past the taper part, and the second claw part is bent at about the same time when the first claw part is locked. In order to maintain and fix the state, it is characterized in that it is fitted into a second lock portion formed of a hook groove provided at a predetermined position of the fixing portion. The above-mentioned films and sheets are lens films for projection screens. And also, in a part of the fitting portion of the bent portion, a film,
It is characterized in that a mold that meshes with the mold of the sheets is provided.

[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. Specifically, the film and sheet spreading support jig of the present invention comprises a bent portion that bends toward the groove portion in the groove portion and a fixed portion that does not bend, and the bent portion and the fixed portion are formed by bending the bent portion. Thus, the fitting portions are fitted to each other via films and sheets, and the fitting portion and the fixing portion are provided integrally, so that the fitting portion is integrated as a whole. By making it one, the work of supporting the extension can be done with one touch, and it can be done easily without the need for tips. Further, at least in the fitting portion of the bent portion,
A first claw part for stretching and supporting films and sheets and a second claw part for maintaining and fixing the bent state are provided,
The fixing portion is provided with a convex first lock portion that has a taper portion and that meshes with the first claw portion, and a second lock portion that is a hooking groove that meshes with the second claw portion, When the folded portion is bent to support the film and sheets in a stretched manner, the first claw portion stretches the film and sheets with the taper portion provided in the fixed portion by the rotational force to project the film and sheets. The locking part is designed to be locked after passing the tapered part, and the second claw part maintains the bent state at about the same time when the first claw part is locked. By being adapted to be fitted into the second lock part consisting of a hooking groove provided at a predetermined position of, the expansion and support of films and sheets,
It is supposed to be possible at the same time surely. And
By providing a mold that engages with the molds of the films and sheets in a part of the fitting portion of the bent portion, the support of the films and sheets is further ensured. In particular, when the film or sheet is a lens film for a projection screen, it is possible to provide a mold in a portion of the lens film for supporting the extension, even at the stage of producing the lens film, and the extension supporting jig having the above-mentioned 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 an essential part of a film / sheet spreading support jig of this embodiment, and FIG. 2 is a plan view of the entire film / sheet spreading support jig of this embodiment. FIG. 1 shows all corners of the expansion support jig shown in FIG. Figure 3 (a) shows
FIG. 3B is a cross-sectional view showing a state before folding of the film and sheet spreading support jig of the present embodiment, and FIG. 3B is a cross-sectional view showing a state after folding fitted through a linear Fresnel lens film. It is a figure and is equivalent to the sectional view of the extension support jig in A1-A2 of FIG. In the figure, 100 is a spreading support jig, 110 is a bent portion, 120 is a fixed portion, 13
Reference numeral 0 is a fitting portion, 131 is a convex portion, 132 is a tapered portion, 13
3 is a first lock part, 134 is a second lock part, 136
Is a first claw portion, 137 is a second portion, 138 is a bending groove, 139A is a film holding portion of the bending portion, 139B.
Is a film holding part of the fixed part, and 150 is a linear Fresnel lens film. The extension support jig 100 of this embodiment
Is a jig for bending and supporting the linear Fresnel lens film 150 from the front and back by the bent portion 110 and the fixed portion 120. Further, the expansion support jig 100 of this embodiment is an integral jig for expanding and supporting the linear Fresnel lens film 150, and the expansion and support work can be performed with one touch, and no tips are required. As shown in FIG. 2, the extension supporting jig 100 of the present embodiment has a frame-shaped structure and extends and supports from the entire periphery of the linear Fresnel lens film 150, but the entire area of each side of the frame. It is not always necessary to stretch and support the linear Fresnel lens film 150 with
Determine the area to support the expansion if necessary. Further, the tapered portion 132 does not necessarily have to be continuously provided. In addition, it is necessary that the expansion support be performed on at least two sides of the opposing frame.

In the extension support jig 100, the bending portion 110 is bent at the bending groove 138 shown in FIG. 3A as a boundary, but when the bending portion 110 and the fixing portion 120 are completely fitted, The first claw portion 136 meshes with the first lock portion 133, the second claw portion 137 meshes with the second lock portion 134, and unless the spreading support jig 100 itself is damaged, such as the nail portion being broken. , It is designed so that it will not come off. As shown in FIG. 3A, the bending groove 138 has an isosceles triangle whose sectional shape is an apex angle θ of about 90 degrees, but the shape is not limited to this shape.
A rotation angle of 10 or more is necessary. Bending part 11
0 and the fixed portion 120 are completely fitted, the film holding portion 139A of the bent portion is the film holding portion 1 of the fixed portion.
The linear Fresnel lens film 150 is sandwiched and fixed together with 39B.
A mold 439A that meshes with the mold of the linear Fresnel lens film 150 formed in a portion to be held, as shown in FIG. 4, in a part of the film holding portion 139A of the bent portion in order to support the 50 more reliably. May be provided. Further, in order to support the linear Fresnel lens film 150 more securely, as shown in FIG. 5, a stopper / holding rib 540 is provided on the film holding portion 139A of the bent portion.
A may be provided.

As shown in FIG. 3 (a), the length from the film holding portion 139A of the bent portion to the catch of the first claw portion 136, that is, the film holding portion 139A of the bent portion when fitted. From the first to the first lock portion 133 a
The relationship with the width b of the convex portion 131 is a ≦ b + (2 ×) where t is the thickness of the linear Fresnel lens film 150.
t) × α, where α is the linear Fresnel lens film 150
It depends on the material, but generally 0.5 to 0.9
It is 9 degrees. Further, the length d from the Y-direction bending groove 138 shown in FIG. 3A to the side where the first claw portion 136 holds the film, and the Y-direction bending groove 138 to the tip of the first claw portion 136. The length e to catch is d> e
There is a relation of this, and this is the linear Fresnel lens film 1
The taper 13 of the convex portion 131 is fitted so as to fit through
2 has been produced. Furthermore, it demonstrates using FIG. In FIG. 5, O is the center of rotation, A is the tip of the first claw 136, B is the upper end of the convex 131, and C is the lower end of the convex 131. In FIG. 5, OA is substantially equal to OB, and OA is preferably OC or higher. The interval (gap) t between the first claw portion 131 and the convex portion when the bent portion 110 and the fixed portion 120 are completely fitted to each other as shown in FIG. 3B is the thickness of the linear Fresnel lens film 150. About 50 to 99% is suitable.

The expansion support jig 100 is generally made by integrally molding a resin, but the material is relatively soft and sticky such as polypropylene or nylon, that is, even if it is deformed. The one that is easy to return is suitable. Since the integrally molded product is bent in the bending groove 138 shown in FIG. 3A, it is mechanically impossible to use a hard resin.

Next, the process of stretch-supporting the linear Fresnel lens film 150 using the stretch-supporting jig 100 for films and sheets of this embodiment will be briefly described with reference to FIG. First, the linear Fresnel lens film 150 is held in a stretched state so as to cover the entire frame-shaped fixed portion. (FIG. 6 (a)) At this time, the linear Fresnel lens film 150 is covered so as not to have wrinkles or slack and to be stretched so as to be along the surface of the film sandwiching portion 139B of the fixing portion provided in the fixing portion. . Next, the bending portion 110 is bent manually or by a predetermined machine while fixing the fixing portion 120 while using the apex 138A of the bending groove 138 as a fulcrum.
(FIG. 6B) At this time, the first claw portion 136 is pushed in while pinching the taper portion 132 and the linear Fresnel lens film 150, so that the linear Fresnel lens film 150 is pressed.
Is pulled by the rotational force when the bent portion 110 is bent, and as a result, the linear Fresnel lens film 150 is further expanded in the direction of the arrow in FIG. 6B. The first claw portion 136 has a tapered portion 132 and a tapered portion 136A for sandwiching the linear Fresnel lens film 150. When the first claw portion 136 is completely pushed in, the first claw portion 136 meshes with the first lock portion, the second claw portion 137 meshes with the second lock portion 134 formed of a hook groove, and the linear Fresnel. The lens film 150 is fixed, but at the same time, the film holding portion 139A of the bent portion holds and fixes the linear Fresnel lens film 150 together with the film holding portion 139B of the fixing portion. (FIG. 6C) The first claw portion 136 is the fixed portion 1.
The taper part 132 formed on the convex part 131 of 20 is the taper part 136A of the first claw part 136 of the bent part 110.
Is formed so as to be caught by the entire convex portion 131 after rotating and passing. Thus, the linear Fresnel lens film 140 is supported by the expansion support jig 100 in the expanded state.

Even when the jig of this embodiment is applied to a material other than the linear Fresnel lens film, the area to be stretched and supported is determined as necessary depending on the material of the film and the sheet, and the taper portion 132 is not necessarily continuous. There is no need to install it in.

[0012]

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 stretch support jig that can reliably and easily stretch and support a linear Fresnel lens film made of a thin film that is not self-supporting and that is used for a projection screen.

[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.

FIG. 4 is a cross-sectional view of a modified example of the extension support jig for films and sheets of the example.

FIG. 5 is a cross-sectional view of a modified example of the expansion support jig for films and sheets of the example.

FIG. 6 is a diagram for explaining a stretch supporting process using a stretch supporting jig for example films and sheets.

[Explanation of symbols]

100 extension support jig 110 bending part 120 fixing part 130 fitting part 131 convex part 132 taper part 133 first locking part 134 second locking part 136 first claw part 136A taper part 137 second claw part 138 bending Groove 139A Film holding portion 139B of bent portion Film holding portion of fixed portion 150 Linear Fresnel lens film 410, 510 Bent portion 420, 520 Fixed portion 431, 531 Convex portion 436, 536 First claw portion 437, 537 Second Claw portion 439B, 539B Film holding portion 440A type fixing portion 540A Stopper / holding rib 450, 550 Linear Fresnel lens film

Continuation of front page (56) Reference JP-A-5-40315 (JP, A) JP-A-5-45736 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 21 / 62 H04N 5/74

Claims (3)

(57) [Claims] 1. A stretch-supporting jig for stretch-supporting films and sheets made of synthetic resin having no self-sustaining property so that wrinkles and slacks do not occur, and a bending portion that bends toward the groove portion side in the groove portion and a bending portion. The fixing part is formed by bending the bending part to form a fitting part that fits with each other through films and sheets, and at least the bending part of the fitting part. On the side, a first claw for expanding and supporting films and sheets and a second claw for maintaining and fixing the bent state are provided, and on the fixing side of the fitting part, a taper part is provided. And a second lock portion including a hooking groove that meshes with the second claw portion is provided, and the bent portion is bent to form a film. , Sheets When supporting the extension, the first claw portion expands by a rotational force while holding the film and sheets with the taper portion provided in the fixing portion, and the first claw portion is formed of a convex portion after passing the taper portion. The second claw portion is provided at a predetermined position of the fixing portion so that the second claw portion is maintained and fixed in the bent state at substantially the same time when the first claw portion is locked. A jig for stretching and supporting films and sheets, which is adapted to be fitted into a second lock portion formed of a hook groove formed therein. 2. A spreading and supporting jig for films and sheets according to claim 1, which is a lens film for a projection screen. 3. A spreading support jig for films and sheets, wherein a part of the fitting portion of the bent portion according to claim 1 is provided with a mold that meshes with a mold for films and sheets.