JPS5837629A - Production of die for manufacture of transmission type screen - Google Patents

Abstract

PURPOSE:To form light shielding parts by coating photosensitive resist on the surface of an inverted die provided with the shape of the inverse type of a circular Fresnel lens and exposing and developing the same through a renticular lens then etching the resist to form recesses. CONSTITUTION:A die 1 provided with the shape of inverse type of a circular Fresnel lens is cut according to designed values. Photosensitive resist 2 is coated on the surface provided with the inverse type of the die 1 and is dried. The coated surface of the resist 3 is exposed through a renticular lens 3 and is partially cured. The resist is developed by using a solvent and is thereby dissolved away of the parts where the progression of curing is low. Thereafter the die having the photosensitive resist 2' partially is acted with an etching soln. and is formed with recesses 4. After the formation of the recesses 4, the resist 2' is removed, whereby a die 5 for manufacturing of the transmission type screen is obtained. Thus the recesses coinciding with the parts where the rays after the passage through the lens 3 do not transmit are easily formed.

Description

[Detailed Description of the Invention] The present invention relates to a mold for producing a transparent screen and a method for manufacturing the same, particularly for circular Fresnel>:, C(1)
The present invention relates to a firefly 62 for simultaneously shaping the shape and the shape of a protrusion that protrudes from a circular Fresnel lens, and a method for manufacturing the same.

The ff1r for producing a cheek-shaped lens is well known, and this So! (Circular obtained by convenient use)
Fresnel lenses have a flat plate shape and are conveniently used.

QlJh sword bay, which is famous for applying a circular Fresnel lens to a 6-inch screen] - 'lt! The 1-inch screen is a combination of a lenticular lens and a circular Fresnel lens, and is made up of separate screens (a lenticular lens and a circular Fresnel lens are provided on the board's table 1411, and the parts on each board that are not equipped with lenses are connected to each other). Attach T <J2-piece type Xh
An oversized screen and one inferior Ill! There is a small transmission type screen in which a lenticular lens and a nerve lens are installed in each opening, and in particular, a single-piece transmission type screen can be manufactured by molding from the LDJ side of the substrate at the same time. It has the advantage of not requiring a bonding process, making it suitable for mass production.

However, when using the above-mentioned transmissive screen in a bright room, the reflection ()・1 of the room light is projected Il! I
The second part that reduces the contrast of the image and eliminates such defects is the part other than the part where the projection light beam is focused by the lenticular lens of expression 1 of the circular frame lens curve of the transmission screen. It is best to cover both parts of the genpuku with the two parts of the genpuku, but it is difficult to form the two parts of the genpuku that cover the circular Fresnel lens curve of the transparent screen once it is completed, due to accuracy and printing methods.

In order to eliminate the difficulty of providing light shielding as described above,
The present inventors formed a lenticular lens and a cheek Fresnel lens on the front and back sides at the same time, and formed a protrusion that protruded more than the circular Fresnel lens, thereby making it easier to form both parts of the Genpuku and with high accuracy. As a result of ωF research, he invented a γ-shaped mold that can efficiently form such a shape.

Describing the method for manufacturing metal lenses of the present invention, first, a metal plate having the inverse shape of the circular Fresnel lens used in the present invention as shown in Fig. 1 is fixed to a surface plate, and then cut. Design and cut the shape of the circular Fresnel lens using a cutting board.Alternatively, without directly cutting the metal plate, cut the circular Fresnel lens shape onto a plastic base plate such as acrylic, epoxy, phenol, or mebumin. Even if it is manufactured by ton casting using nickel, steel, etc. after it is installed, it will not support the left side.

Next, photosensitive resist 2 is applied to the curve of the mold having the reverse shape of the circular Fresnel lens formed as described above, as shown in Fig. 2, and dried. . The resist is preferably of the yttt type, and cinnamoyl-based, diazo thread, azide-based, acryloyl-based, nisglu acrylate-based resists, etc. can be used.

The above-mentioned resist can be applied by known coating methods, such as gravure coating, roll coating, air knife coating, Giscoat, spray coating, continuous coating, dip coating, spinner coating, wheeler coating, and brush coating.

This can be done by solid coating using silk screen.

Next, the photosensitive resist 2 is exposed to light through the lenticular lens 6 as shown in FIG. 43 in the direction in which the photosensitive resist 2 has been applied as described above to partially harden the photosensitive resist. As the lenticular lens 3, a lens similar to the lenticular lens formed between one side of the transmission screen manufactured using the mold obtained by the present invention is used, and the focal length is adjusted appropriately to perform g-axis. . As the light source used for formation, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, a metal paralite lamp, etc. can be used, but a light source other than these may be used.

Based on 1.1 above, the photosensitive resist in the part corresponding to the light condensing part of the Fresnel lens progresses in hardening, and the other parts harden less, so if you perform development with a solvent etc., there will be a difference in solvent properties. occurs.

Next, after forming the party, use a drug to 71 & original sex resist song, m
Do the statue. The bath agent used for development depends on the resin system of the photosensitive resist used, but methyl
By the above-described development, the parts that have not progressed much in hardening other than the part T corresponding to the condensing part by the lenticular lens during exposure are dissolved and removed.
An etching solution is applied to the mold partially having the resist 2 in the fi curve, and the part of the mold other than the resist is etched to form a hollow recess s4 as shown in FIG. As the etching solution, known aqueous ferric chloride solution, aqueous sodium hydroxide solution, dilute hydrochloric acid, etc. can be used, and etching can be performed by dipping, coating, or spraying.

After performing etching as described above to form the desired four parts, the resist is removed to form a circular Fresnel lens with an inverted shape of 1d and a groove deeper than the four parts of the inverted shape, as shown in FIG. A mold 5 for producing a transmission screen is obtained. To remove the resist, use methyl ethyl ketone, acetone, toluene, xylene, or hydrofluoric acid.
It is applied by coating or spraying with a solvent such as alcohol.

Further, by attaching it to a cylinder of a mold and letting it settle, or by attaching it to a cylinder after manufacturing a mold, it is possible to continuously shape the mold and to manufacture a cylinder-shaped mold.

Since the present invention is made as described above, it is possible to easily form a concave portion that matches the portion where the light beam does not pass through after passing through the lenticular lens, and by using the mold obtained by the present invention, A transparent M screen in which it is easy to form a traced area can be easily produced.

[Brief explanation of drawings]

The first factor to the sixth factor are 1111 factors showing the structure of each upper stage of the mold manufactured by the present invention. 1......Venus 2 with an inverse shape of the Tecular Flare Lens 2...Photosensitive resist 2...・Hardened photosensitive resist 6...
...Lenticular lens 4 ...4
Capital 5: Patent applicant for mold for manufacturing transparent 2Bp screen Dai Nippon Printing Co., Ltd.

Claims (2)

[Claims] (1) A method for manufacturing a mold for producing a passing double screen, characterized by including each of the steps below. 9) Step 1 of applying a photosensitive resist to the part of the mold where the inverted mold is provided with the inverted 71 shape of the f-curable lens through the lenticular lens. The process of partially curing the photosensitive resist to RJ, and the process of removing uncured resist by lighting a four-stroke lamp, removes the resist from the mold. The process of applying etching to the parts to form the four parts. (2) The process of installing the mold on the cylinder surface till 8
- Manufacture of a mold for manufacturing a transmission screen according to Claim 1 J', characterized in that: