JPH0633461Y2 - Film-shaped lens sheet with frame - Google Patents

Description

[Technical Field] The present invention relates to a lens sheet forming a part of a transmissive screen used in a projection TV device, and particularly,
The present invention relates to a thin film lens sheet with a frame.

[Background technology]

Conventionally, a transmissive screen used in this type of projection TV apparatus is mainly composed of two sheets, a lenticular lens sheet and a Fresnel lens sheet, each having a thickness of 1 to 3 mm.

In such a transmissive screen, since the lens sheet has a large thickness, there are problems that a multiple image occurs due to repeated reflection inside the screen, the resolution is deteriorated, and the like.

Further, the thick transmissive screen is disadvantageous in terms of material cost, and it has been demanded to make the transmissive screen thinner.

However, if the transmissive screen is made thinner, the screen loses its independence, making it difficult to mount the projection TV device in the cabinet.

An object of the present invention is to solve the above problems and to provide a framed film lens sheet that can maintain the planar state of a thinned lens sheet and can be put to practical use as a transmissive screen.

[Disclosure of device]

In order to achieve the above-mentioned object, the framed film-shaped lens sheet according to the present invention is arranged in the film-shaped lens sheet and the outer circumference of the film-shaped lens sheet, and each side has a curved elastic shape so as to bulge in the outer peripheral direction. The film-shaped lens sheet, wherein the four corners of the film-shaped lens sheet are attached to the frame, and the frame is further deformed to a position substantially corresponding to each side of the film-shaped lens sheet. The film-shaped lens sheet and the frame body are fixed in a state in which tension is applied in the outer peripheral direction.

The film-like lens sheet may be formed into a film shape with a material having a large tensile stress, and may be a lens sheet itself formed into a film shape alone, or a polyester film, a polycarbonate film or the like. The lens part may be formed using such a film having a large tensile stress as a support. In any of the above forms, the total thickness of the lens sheet is 0.1 mm to 1.0 mm
Only those with a degree are targeted.

The lens shape is not particularly limited, but a Fresnel lens,
A prism lens, a lenticular lens, etc. can be applied.

As a method of manufacturing a lens sheet, the applicant of the present invention has proposed a method of forming a resin pool of an ionizing radiation curable resin such as a UV curable resin on a molding die on which a lens pattern has been formed, and ionizing radiation on the resin reservoir. The transparent base member is laminated while being leveled with a pressure roller, and the laminated ionizing radiation curable resin is irradiated with ionizing radiation to be cured and then released from the mold.
At this time, a film may be used as the base member, or a flat or curved relatively thick transparent resin plate may be formed and then the plate may be peeled off. Further, in order to improve the defoaming property, a step of previously applying an ionizing radiation curable resin having good wettability to the molding die may be added.

The frame is formed in a shape in which the tension swells in the outer peripheral direction, and when the frame is attached to the film-shaped lens sheet to be integrated with the film-shaped lens sheet, the frame-shaped body is deformed so that the tension is generated in the outer peripheral direction. The lens sheet is always tensioned.

The frame body can be produced by preparing four rod-shaped frame members having a curved shape and having elasticity and fixing the four corners. The material of the frame body may be any material that has good elasticity and is easy to process, and plastics such as hard vinyl chloride, metal, wood, etc. can be used.

The method for attaching the lens sheet to the frame may be screwing, or adhesion with an adhesive or the like. First, if the four corners of the lens sheet are fixed and then the four sides are fixed on opposite sides, it is easy to stretch.

In a specific case, for example, when biaxially stretched polyester or the like is used as the base film of the lens sheet and the lens portion is formed of a material having a small thermal deformation, after the lens sheet is attached to the frame body, as a post-processing, By performing a heating treatment (hot air treatment), the film shrinks and the sheet can be stretched.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

FIGS. 1 and 2 are views showing an embodiment of a film-shaped lens sheet with a frame according to the present invention. FIG. 1 shows a state before attachment and FIG. 2 shows a state after attachment. FIG. 3 and FIG. 3 are views showing the mounting structure of the lens sheet and the frame body of the above embodiment.

The film-shaped lens sheet 1 has a length of 1524 mm and a width of 2032 mm.
A 00 inch size was prepared.

That is, a urethane acrylate UV curable resin adjusted to have a refractive index of 1.49 and a viscosity of 100 centipoise was applied to the entire surface of a molding die having a Fresnel lens die having a pitch of 0.1 mm to a thickness of 50 μm by a silk screen method. Next, the refractive index 1.
Using an epoxy acrylate type UV curable resin adjusted to a viscosity of 150 centipoise, a resin pool of 1.0 g / cm ² was formed on one end of the mold by a flow coating method.
As a base film, a 0.05 mm thick polyester film coated with a vinyl chloride / vinyl acetate copolymer-based primer is overlaid, sandwiched with pressure rolls from above and below, and the speed is 200c.
Rolled and pressurized at m / min. At this time, the UV light source
UV of 0 W / cm was irradiated from the side of the base film to cure each UV curable resin. Then, the mold was depressurized and released to prepare a film-shaped lens sheet having a thickness of 0.25 mm.

The frame body 2 is formed by molding four frame materials 21 to 24 made of hard vinyl chloride curved in an arc shape and arranged so that the central portion thereof projects outward as shown in FIG. It was fixed with angle brackets and assembled into a rectangle. Each frame member 21 to 24 is provided with a groove for mounting the lens sheet (third part)
Figure).

Next, a procedure for attaching the lens sheet 1 to the frame body 2 will be described.

First, as shown in FIG. 1, the four corners of the lens sheet 1 are
It is inserted into the groove of the frame body 2 and fixed with screws 31 as shown in FIG. Next, as shown in FIG. 2, the frame members 21 to 24 are deformed so that each side of the lens sheet 1 is placed on each of the frame members 21 to 24.
Fix the place and 16 places by the same method.

As shown in FIG. 2, the obtained film-shaped lens sheet with a frame was subjected to tension T on the outside and had no looseness or the like.

Various modifications can be made within the scope of the present invention without being limited to the embodiments described above.

4 to 6 are views showing modified examples of the mounting structure of the frame body and the lens sheet.

As shown in FIG. 4, the frame member 41 may be fixed to one side of the lens sheet 1 with an adhesive 42.

In addition, as shown in FIG. 5, a frame body 5 including a frame member 51 having a large number of pins 51a planted therein and a frame member 52 having a hole 52a into which the pin 51a is inserted is used. The frame members 51 and 52 may be joined by penetrating the lens sheet 1 with the 51a. In this case, the frame members 51, 52 can be made of metal, plastic, wood, etc., and can be joined by adhesion, welding, etc., or fixed by screwing.

Further, as shown in FIG. 6, a frame member 6 having a groove 61a having a trapezoidal cross section and a frame member 62 having a protrusion 62a having a trapezoidal cross section is used to sandwich a lens sheet. Then, it may be fixed by a method such as screwing. In this case, since the lens sheet can be continuously sandwiched by the frame body, partial slack or the like does not occur,
It can be fixed easily and securely.

[Effect of device]

As described in detail above, according to the present invention, since tension is applied to the outside of the film-shaped lens sheet after assembly, the film-shaped lens sheet has high planarity and can be securely fixed.

Also, unlike a thick lens sheet, there is no optical multiple image generation, the resolution is good, and there is no deformation even if the environmental temperature, humidity, etc. change.

Furthermore, since the lens sheet can be made thin, the cost of materials can be reduced, and since the whole can be weighed, it can be easily attached to the projection TV device.

Therefore, when it is used for a transmission screen of a projection device, it is extremely good in terms of structure and engineering.

[Brief description of drawings]

FIGS. 1 and 2 are views showing an embodiment of a film-shaped lens sheet with a frame according to the present invention. FIG. 1 shows a state before attachment and FIG. 2 shows a state after attachment. FIG. 3 and FIG. 3 are views showing the mounting structure of the lens sheet and the frame body of the above embodiment. 4 to 6 are views showing modified examples of the mounting structure of the frame body and the lens sheet. DESCRIPTION OF SYMBOLS 1 ... Film-shaped lens sheet 2 ... Frame body 21-24 ... Frame material 4-6 ... Frame body

Claims (1)

[Scope of utility model registration request] 1. A film-shaped lens sheet, comprising: a film-shaped lens sheet; and a frame body arranged on the outer periphery of the film-shaped lens sheet, the frame body having a curved shape so that each side bulges in the outer peripheral direction. The four corners are attached to the frame body, the frame body is further deformed to a position substantially corresponding to each side of the film lens sheet, and tension is applied in the outer circumferential direction of the film lens sheet, A film-shaped lens sheet with a frame, wherein a lens sheet and the frame body are fixed.