JPS5837628A - Mold for producing transparent screen and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Azuko Akira! J Transparent screen installation! The present invention relates to W and its manufacturing process, and particularly to a mold for simultaneously shaping the J16 shape of a two-dimensional Fresnel lens and the shape of a protrusion that is more protruding than a circular Fresnel lens, and a method for manufacturing the same.

Molds for making circular-couple lenses are well-known3)
- [This firefly! The tegural lens obtained by using sand 4 produces a hand plate-shaped lens.
It is used extensively.

Recently, it has become difficult to use a transparent lens with a transmissive screen. Such an effective screen is a combination of a lenticular lens and a tegular frame lens, and the lenticular lens and circular frame lens are provided on the surfaces of separate substrates, and the surfaces of each substrate where no lenses are attached are pasted together. There are two types of transmissive screens that fit together, and one-piece transmissive screens that have lenticular lenses and two-unicular flare lenses on both sides of a single substrate. The I-type screen can be formed and manufactured from both sides of the substrate at the same time, and has the advantage of not requiring a bonding process, and is suitable for ILM.

However, when using the above-mentioned tooth-shaped screen C2 in a bright room (2), the reflection of indoor lights reduces the contrast of the projected image, and in order to eliminate this drawback, Jt!1 It is best to cover the area other than the part where the projection light is focused by the &ff1l lenticular lens for the circular Fresnel lens of the over-type screen, but once the transmission screen is completed, It is difficult to form a shielding group over the circular Fresnel lens 11G due to the accuracy and printing method.

In order to eliminate the difficulty of providing the original shielding part as described above,
The present inventors formed a lenticular lens and a circular Fresnel lens on both sides at the same time, and formed a protrusion that protruded more than the circular Fresnel lens, thereby preventing the formation of the original shield. As a result of our research, we discovered what we could do with both quality and precision.
This invention provides a mold for efficiently forming such a cylindrical shape.

In the following, the mold of the present invention will be described. For example, as shown in FIG. It has a deep groove 6 sunk into history.

Mold substrates include aluminum, brass, copper, nickel,
Using a metal plate such as stainless steel or zinc, it is possible to directly cut the metal plate, or to cut a acrylic, epoxy, phenol, polyvinyl chloride, etc. resin plate that can be cut + 11 by cutting, etc. An inverted type can be used due to the lurens mother type. There is no relationship between the pitch of the circular Fresnel lens and the pitch of γIlq, and the pitch of the grooves is determined according to the pitch of each wrench of the lenticular lens on one side of the transmission screen to be manufactured.

Further, it is preferable that the bottom of the groove of the mold as described above is parallel to the mold surface, and the transparent material obtained by using such a mold is
The best way to create a type screen is to set up a former shielding city.

In addition, it is preferable that the above-mentioned mold is provided on the cylinder surface by a method such as forming it on the cylinder surface or attaching it to the cylinder, which is a mold made into a flat plate. By doing so, it is possible to continuously apply the resin to a melt-extruded sheet or the like.

To explain the preferable manufacturing method of the above-mentioned mold according to the present invention, first, a mold having an inverted shape 1 and a spiral shape 2 of a cheekular Fresnel lens, which has a bulge due to the second reason, is manufactured by a conventional method. For example, a metal plate made of aluminum, brass, steel, nickel, stainless steel, zinc, or the like is fixed to a surface plate, and cut using a cutting machine according to the designed shape of the circular Fresnel lens. Alternatively, instead of directly cutting the metal plate, it is not possible to cut the adhesive onto a glass base plate made of acrylic, epoxy, phenol, etc.

Next, the mold obtained as described above is attached to a cylinder. Although it is not necessarily necessary to attach the mold to the cylinder, it is preferable to attach the mold to the cylinder because continuous shaping becomes possible. The light can be installed in the cylinder by any method, but for example, the cylinder Table 1
For mounting, cut a mounting groove parallel to the axial direction of the cylinder, bend the end of the mold, push it into the mounting groove, and fix it using bolts or push-fittings, etc., as necessary. Accordingly, it is best to fill the unlucky@ part with resin, low-temperature melting metal, etc. to produce a cylindrical mold with a uniform appearance.

Next, the surface of the cylindrical mold as above is '14',
Filling is performed using filler 4 as shown in FIG.

As the material, it is preferable to use a material such as shellac or asfax resin, which has good tightness with the mold, can be cut, and can be easily separated by a separate operation. For example, filling n1j with force 1 is as follows:
This can be done by applying a melt of the filler described above or a solution using a hot medium over a period of time. Light JtA as above
The purpose of filling the material with the agent is to prevent flaking and sagging during cutting.

Next, using a lathe or the like, create a transmissive screen using a pitch corresponding to the pitch of the inverted lenticular lenses of the lenticular lens, which is another type of transmissive screen, as shown in Figure 4. m3, which is deeper in history than the fourth part of
to be engraved.

The shape of the groove is preferably such that the bottom part thereof is parallel to the mold surface and is flat.Sergular flare lenses manufactured using a mold having such a cylindrical groove are It has a protrusion with a flat top as shown in 1d, and the light is 3m.
It is difficult to apply by permanent printing, coating, or transfer.

Since the present invention has the above configuration, the ii of the present invention
By using the mold of the invention, it is possible to manufacture a transmission type screen that can easily be provided with a section on the 7-year-old clothes 111.

Moreover, according to the manufacturing method of the second invention of the present invention, the mold of the first invention requires special equipment, and moreover, it is possible to fit the pitch base with the lenticule lens, and Deeper than the reverse type concave #ball IS of the flare lens,
It is easy to reverse mold a circular Fresnel lens with a flat bottom and a skewered groove in the mold 1111! I can make it to 14.

[Brief explanation of drawings]

The first factor is that the structure of the mold according to the present invention is shown in FIG. 1, and FIG. 1... Gold M substrate 2... Reverse shape of circular Fresnel lens 6... Groove 4... filler

Claims (5)

[Claims] (1) A groove that is deeper than the 4m concave 4nI of the Fresnel lens is provided in the corner-shaped curve in which the reversed shape of the Fresnel lens is provided. s 17ω □ Bud mold for screen production. (2) The mold for producing a transparent screen according to item 1, characterized in that the bottom of the groove has a curve parallel to the mold surface. (3) A mold for manufacturing a transparent screen according to claims 1 to 2, wherein the mold is provided on the front side of the cylinder. (4) A groove deeper than the concave part of the reverse mold of the Fresnel lens (2) where the reverse mold of the mold is provided with the groove of the reverse mold of the Fresnel lens. A manufacturing method for a J11 over-type screen production mold that is created by cutting. (5) Patent 6, characterized in that a mold is provided at the coal content of the cylinder. “A method for manufacturing a mold for producing a transmission screen as described in item 4 of the range of requirements.” ((When providing il r# by cutting,
[Gyakukin] Fill the blood with the shape of 6 and fill it with a light agent.
ii-1-The production of the transparent screen as described in Items 1 to 5 of ``F rF Requiem 4'', which is characterized by the following! How to make bonds.