JPS61182908A - Manufacture of screen for video projector - Google Patents
Manufacture of screen for video projectorInfo
- Publication number
- JPS61182908A JPS61182908A JP2541485A JP2541485A JPS61182908A JP S61182908 A JPS61182908 A JP S61182908A JP 2541485 A JP2541485 A JP 2541485A JP 2541485 A JP2541485 A JP 2541485A JP S61182908 A JPS61182908 A JP S61182908A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- ultraviolet
- resin
- plate
- curing resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はビデオプロジェクタ−などに使用される透過
形スクリーンの製造方法の改善に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a method of manufacturing a transmission screen used in a video projector or the like.
第3図ta+は、一般的な透過形スクリーンとしてのフ
レネルレンズの正面図、第3図(b)は第3図(a)に
おける[b−1b線断面図である。3(a) is a front view of a Fresnel lens as a general transmission screen, and FIG. 3(b) is a sectional view taken along the line [b-1b in FIG. 3(a).
図において、(11はフレネルレンズ、(2)はレンズ
面、(3)は非レンズ面である。In the figure, (11 is a Fresnel lens, (2) is a lens surface, and (3) is a non-lens surface.
このようなフレネルレンズは熱可塑性のアクリル樹脂等
を熱間プレスして製造され、従来、これらの方法では加
熱されたアクリル樹脂を金型によって成形し冷却後離型
するという手順で製造されていた。Fresnel lenses like this are manufactured by hot pressing thermoplastic acrylic resin, etc. Conventionally, these methods were manufactured by molding heated acrylic resin with a mold, cooling it, and then releasing it from the mold. .
しかしながら、以上の工程では、加熱後の冷却C:よっ
てアクリル樹脂か、例えばφl O0011m+のサー
キュラ−フレネルレンズの場合7雛程度収縮をおこすた
め非レンズ面(3)が成形用金型を強力に締めつけてし
まった。また、冷却の際に歪を発生させない為に徐冷か
必要で一工程に60分以上要していた。However, in the above process, cooling C after heating: Therefore, in the case of acrylic resin, for example, a circular Fresnel lens of φl O0011m+, the non-lens surface (3) strongly clamps the mold. It happened. In addition, slow cooling was required to prevent distortion during cooling, and one step took more than 60 minutes.
この結果、離型が非常に困難になり、金型の専有時間か
長いため生産性が悪いという問題点があった。As a result, it becomes very difficult to release the mold, and the time required for exclusive use of the mold is long, resulting in poor productivity.
このため、熱間プレスを使用せずに、かつ熱間プレス使
用の製法で造られたフレネルレンズと同等の性能を有す
るフレネルレンズを得るため種々の製造方法が検討され
ている。For this reason, various manufacturing methods are being considered in order to obtain a Fresnel lens that does not use hot pressing and has the same performance as a Fresnel lens manufactured by a manufacturing method that uses hot pressing.
第4図は従来のフレネルレンズの製造方法を示す断面構
成図である。図において、(4)はフレネルレンズ用の
金型、(51は紫外線照射装置、(61は紫外線透過性
板、(7)は紫外線硬化性樹脂の注入方向、(81は注
入口、(9)は排気口、σaは排気方向である。FIG. 4 is a cross-sectional configuration diagram showing a conventional Fresnel lens manufacturing method. In the figure, (4) is a mold for a Fresnel lens, (51 is an ultraviolet irradiation device, (61 is an ultraviolet transmitting plate, (7) is an injection direction of ultraviolet curable resin, (81 is an injection port, (9) is the exhaust port, and σa is the exhaust direction.
レンズ面の型を有する金型(4)と紫外線透過性板+6
1の間を排気口+91から図示していない真空ポンプに
よって排気することにより真空にしながら注入口(8)
より紫外線硬化性樹脂を注入し、前記板(61の上部よ
り紫外線照射装置151 Cよって紫外線を照射し、前
記紫外線硬化性樹脂を硬化させ上記フレネルレンズの金
型(41の形状に成形する。成形後::前記板(61を
除去し離型する。Mold with lens surface mold (4) and ultraviolet transparent plate +6
1 is evacuated from the exhaust port +91 by a vacuum pump (not shown), and the injection port (8) is evacuated.
A UV curable resin is injected into the plate (61) and UV rays are irradiated from the upper part of the plate (61) by an ultraviolet irradiation device 151C to cure the UV curable resin and molded into the shape of the Fresnel lens mold (41). After:: The plate (61) is removed and released from the mold.
上記のような従来の製造方法では、紫外線硬化性樹脂を
使用したことによって、製造中、加熱および徐冷の必要
がなくなり、加熱プレス方式に比べ短時間で一工程を終
えることができるようになったが、製造時(巨あらかじ
め注入口および排気口を取り付ける必要性があった。更
に真空ポンプおよびホッパーとの接続を要するため、そ
れらの接続管および接続方法が必要となる。また、注入
口および排気口の口径によって注入速度が決定されるが
(但し、一定精度、一定圧力の時)、パイプ状の注入口
を使用した樹脂注入方式では注入速度におのずと限界が
あり注入時に泡を混入した場合、排気口から脱泡するが
困難で、手直しC:非常な時間と労力を消耗するという
問題点があった。In the conventional manufacturing method described above, the use of ultraviolet curable resin eliminates the need for heating and slow cooling during manufacturing, making it possible to complete one process in a shorter time than with the hot press method. However, during manufacturing (it was necessary to install an inlet and an exhaust port in advance). Furthermore, since connection with a vacuum pump and hopper is required, connection pipes and connection methods for these are required. The injection speed is determined by the diameter of the exhaust port (provided that the accuracy and pressure are constant), but with resin injection methods that use a pipe-shaped injection port, there is a natural limit to the injection speed, and if bubbles are mixed in during injection. There was a problem in that it was difficult to remove bubbles from the exhaust port, and that rework C: required a great deal of time and effort.
この発明は、かかる問題点を除去するためになされたも
ので、注入速度が自由にコントロールでき、泡の発生に
対しても簡単に処置することができるというビデオプロ
ジェクタ−用スクリーンの製造方法を提供しようとする
ものである。The present invention was made to eliminate such problems, and provides a method for manufacturing a screen for a video projector in which the injection speed can be freely controlled and the generation of bubbles can be easily dealt with. This is what I am trying to do.
この発明のビデオプロジェクタ用スクリーンの製造方法
は、レンズ面の型を有するビデオプロジェクタのスクリ
ーン用金型内に紫外線硬化性樹脂を減圧下で注入し、紫
外線透過性板で被い、この紫外線透過性板と金型の間に
充填された紫外線硬化性樹脂に上記紫外線透過性板を通
して紫外線を照射して硬化させ、硬化した紫外線硬化性
樹脂を離型しビデオプロジェクタ用スクリーンを得るも
のである。The method for manufacturing a video projector screen of the present invention includes injecting an ultraviolet curable resin under reduced pressure into a mold for a video projector screen having a lens surface mold, and covering the resin with an ultraviolet transparent plate. The ultraviolet curable resin filled between the plate and the mold is cured by irradiating ultraviolet rays through the ultraviolet transparent plate, and the cured ultraviolet curable resin is released from the mold to obtain a screen for a video projector.
この発明においては、スクリーン用金型に直接注入口、
排気口を設ける必要がない為、注入速度を自由(−コン
トロールすることが出来、しかも注入口および排気口を
それぞれホッパーおよび真空ポンプに直接接続する必要
もなくなり、また泡を混入しても簡単に脱泡(排気口を
通して脱泡する必要がない)できるので、手直しが簡単
で生産性が向上する。In this invention, a direct injection port is provided in the screen mold.
Since there is no need to provide an exhaust port, the injection speed can be controlled freely, and there is no need to connect the injection port and exhaust port directly to the hopper and vacuum pump, respectively. Since it can be degassed (there is no need to degas it through an exhaust port), rework is easy and productivity is improved.
この発明の一実施例の紫外線硬化性樹脂を用いたフレネ
ルレンズの製造方法について、図に基いて説明する。第
1図および第2図はこのフレネルレンズの製造方法を工
程順に示す断面構成図である。図において、(IA)は
紫外線硬化性樹脂、(11)は真空容器、α渇はガスケ
ット、θ9は給、排気口、(14)は真空ピンセラl−
1(151は樹脂注入用管である。A method for manufacturing a Fresnel lens using an ultraviolet curable resin according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are cross-sectional configuration diagrams showing the method of manufacturing this Fresnel lens in order of steps. In the figure, (IA) is an ultraviolet curable resin, (11) is a vacuum container, α is a gasket, θ9 is a supply and exhaust port, and (14) is a vacuum pincer l-
1 (151 is a resin injection tube.
まず、第1図に示すようにレンズ面の型を有するフレネ
ルレンズ用の金型(4)と紫外線透過性板(61を真空
容器I内に入れ、図示していない真空ポンプ≦二よって
排気し容器(II)内を10 Torrに減圧する。First, as shown in Fig. 1, a Fresnel lens mold (4) having a mold for the lens surface and an ultraviolet-transparent plate (61) are placed in a vacuum container I, which is evacuated by a vacuum pump (not shown). The pressure inside the container (II) is reduced to 10 Torr.
次に紫外線硬化性樹脂を図示しないホッパー内で脱泡し
、金型(4)上まで移動した樹脂注入用管(15)を経
て真空容器(11内のフレネルレンズ用金型(4)に注
入する。注入量は樹脂の表面張力で金型上面に盛り上が
る程度C:入れるのがよ(、それ以上では金型の外に流
出してしまうし、それ以下であれは、後述する紫外線透
過性板(6)をかぶせた時に泡を巻き込む結果となる。Next, the ultraviolet curable resin is degassed in a hopper (not shown) and injected into the Fresnel lens mold (4) in the vacuum container (11) through the resin injection tube (15) that has moved above the mold (4). The amount of injection should be such that it rises to the top of the mold due to the surface tension of the resin. When (6) is covered, bubbles will be drawn in.
また真空容器αυ内に置いたフレネルレンズ用金型14
+はほぼ水平に置かれていることが必要条件となる。紫
外線硬化性樹脂(IA)の注入が完了後、樹脂注入用管
(19を引っ込め、容器内を常圧にもどして、真空ピン
セットα4により保持された紫外線透過性板(6)を紫
外線硬化性樹脂(IA)の上C:泡(空気)を巻き込ま
ないようにかぶせる。この時紫外線硬化性樹脂(IA)
は真空中から常圧にもどされたので、1気圧の圧力がか
かつて、その圧力分だけ樹脂は見かけ上受なくなる。故
に紫外線透過板(61をかぶせる時に多少多いめに(表
面張力分だけ)樹脂をフレネルレンズ用金型(4)に注
入していないと、紫外線透過板(6]と紫外線硬化性樹
脂(IA)との界面に空気を巻き込む結果となる。また
注入時に樹脂中に泡を混入したときには、答器内圓をは
じめの圧力よりもさらに減圧することによって脱泡する
ことができる。(尚、紫外線透過板(6)を紫外線硬化
性樹脂(IA)≦:被せるのは真空容器aυ内あるいは
容器外のどちらで行なっても良く、最後に第2図に示す
ように上記板(6)の上部より紫外線照射装置(5)C
二よって紫外線を照射し、上記紫外線硬化性樹脂(IA
)を硬化させ、フレネルレンズ用金型(4)の形状に成
形する。成形後に上記板(61を除去し離型する。Also, a Fresnel lens mold 14 placed inside the vacuum container αυ
The necessary condition for + is that it be placed almost horizontally. After the injection of the ultraviolet curable resin (IA) is completed, the resin injection tube (19) is withdrawn, the inside of the container is returned to normal pressure, and the ultraviolet transparent plate (6) held by the vacuum tweezers α4 is injected with the ultraviolet curable resin. (IA) Top C: Cover it so as not to trap bubbles (air).At this time, use ultraviolet curable resin (IA).
Since it was returned to normal pressure from a vacuum, the pressure of 1 atmosphere is heated up, and the resin is apparently not affected by that pressure. Therefore, if you do not inject a little more resin (according to the surface tension) into the Fresnel lens mold (4) when covering the UV transmitting plate (61), the UV transmitting plate (6) and the UV curable resin (IA) will not be injected. This results in air being drawn into the interface between the resin and the resin.Also, if bubbles are mixed into the resin during injection, they can be removed by reducing the pressure in the inner chamber of the reactor even further than the initial pressure. The plate (6) may be covered with ultraviolet curable resin (IA)≦: It may be done either inside the vacuum vessel aυ or outside the vessel, and finally, as shown in Figure 2, ultraviolet rays are applied from the top of the plate (6). Irradiation device (5)C
2) The above ultraviolet curable resin (IA) is irradiated with ultraviolet light.
) is cured and molded into the shape of a Fresnel lens mold (4). After molding, the plate (61) is removed and the mold is released.
このようにして得られたフレネルレンズは、従来の金型
を使用した場合と同様の緒特性を満足させるものであっ
た。The Fresnel lens thus obtained satisfied the same properties as those obtained using a conventional mold.
さらに、上記実施例では、ビデオプロジェクタ−用スク
リーンの製造方法として、フレネルレンズを製造する場
合について述べたが、レンズ面がレンチキュラーレンズ
面の型を用いればレンチキュラーレンズが得られ、さら
に、紫外線透過性板のレンズ面に対向する面を適当なレ
ンズ面の型にすることにより、フレネルレンズ面とレン
チキュラーレンズ面を両面に備えたスクリーンを上記実
施例と同様に得ることができる。Further, in the above embodiment, a case was described in which a Fresnel lens was manufactured as a method for manufacturing a screen for a video projector, but a lenticular lens can be obtained by using a mold with a lenticular lens surface, and furthermore, a lenticular lens can be obtained. By shaping the surface of the plate facing the lens surface into a suitable lens surface type, a screen having Fresnel lens surfaces and lenticular lens surfaces on both sides can be obtained in the same manner as in the above embodiment.
この発明は以上説明したとおり、レンズ面の型を有する
ビデオプロジェクタのスクリーン用金型内に紫外線硬化
性樹脂を減圧下で注入し、紫外線透過性板で被い、この
紫外線透過性板と金型の間に充填された紫外線硬化性樹
脂に上記紫外線透過性板を通して紫外線を照射して硬化
させ、硬化した紫外線硬化性樹脂を離型することにより
、製造時にあらかじめ注入口および排気口を取り付ける
必要がなく、またそれらの接続管に対する接続作業がな
くなり、さらに、注入が簡単で、注入速度のコントロー
ルが容易になり、しかも泡の混入に対する対応も短時間
ででき、生産性良好にビデオプロジェクタ用スクリーン
を製造できる効果がある。As explained above, this invention involves injecting an ultraviolet curable resin under reduced pressure into a mold for a video projector screen having a lens surface mold, covering it with an ultraviolet transparent plate, and combining the ultraviolet transparent plate and the mold. By irradiating the UV curable resin filled in the space with UV rays through the UV transparent plate and curing it, and then releasing the cured UV curable resin from the mold, it is no longer necessary to attach an injection port and an exhaust port in advance during manufacturing. In addition, it eliminates the need to connect those connecting pipes, and it also simplifies injection, makes it easier to control the injection speed, and allows for quick response to bubble contamination, making it possible to assemble video projector screens with high productivity. It has the effect of being manufacturable.
る。Ru.
第1図および第2図はこの発明の一実施例に係わるフレ
ネルレンズの製造方法を工程順に示す断面構成図で第1
図は樹脂注入時を、第2図は樹脂硬化時を示している。
第3図(a)は一般的なフレネルレンズの正面図、第3
図(t)lは第3図ta+におけるlb −Wb H,
f(面図、第4図は従来のフレネルレンズの製造方法を
示す断面構成図である。
図において、(IA)は紫外線硬化性樹脂、(4)はビ
デオプロジェクタ用スクリーン(フレネルレンズ)の金
型、(5)は紫外線照射装置、(6)は紫外線透過性板
、αυは真空容器、(19は樹脂注入用管である。
なお、図中同一符号は同−又は相当部分を示す。FIGS. 1 and 2 are cross-sectional configuration diagrams showing the manufacturing method of a Fresnel lens according to an embodiment of the present invention in the order of steps.
The figure shows the resin injected, and FIG. 2 shows the resin cured. Figure 3(a) is a front view of a typical Fresnel lens;
Figure (t)l is lb - Wb H in Figure 3 ta+,
f (side view, Figure 4 is a cross-sectional configuration diagram showing the conventional Fresnel lens manufacturing method. In the figure, (IA) is an ultraviolet curable resin, and (4) is the gold of a video projector screen (Fresnel lens). A mold, (5) is an ultraviolet irradiation device, (6) is an ultraviolet transmitting plate, αυ is a vacuum container, and (19 is a resin injection tube. In the figures, the same reference numerals indicate the same or corresponding parts.
Claims (4)
リーン用金型内に紫外線硬化性樹脂を減圧下で注入し、
紫外線透過性板で被い、この紫外線透過性板と金型の間
に充填された紫外線硬化性樹脂に上記紫外線硬化性板を
通して紫外線を照射して硬化させ、硬化した紫外線硬化
性樹脂を離型するビデオプロジェクタ用スクリーンの製
造方法。(1) Injecting ultraviolet curable resin under reduced pressure into a video projector screen mold having a lens surface mold,
Covered with a UV-transparent plate, the UV-curable resin filled between the UV-transparent plate and the mold is cured by irradiating the UV-curable resin through the UV-curable plate, and the cured UV-curable resin is released from the mold. A method of manufacturing a screen for a video projector.
囲第1項記載のビデオプロジェクタ用スクリーンの製造
方法、(2) A method for manufacturing a screen for a video projector according to claim 1, wherein the lens surface is a Fresnel lens surface;
求の範囲第1項記載のビデオプロジェクタ用スクリーン
の製造方法。(3) The method for manufacturing a screen for a video projector according to claim 1, wherein the lens surface is a lenticular lens surface.
ュラーレンズ面である特許請求の範囲第2項記載のビデ
オプロジェクタ用スクリーンの製造方法。(4) The method for manufacturing a screen for a video projector according to claim 2, wherein the surface of the ultraviolet-transparent plate facing the lens is a lenticular lens surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2541485A JPS61182908A (en) | 1985-02-12 | 1985-02-12 | Manufacture of screen for video projector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2541485A JPS61182908A (en) | 1985-02-12 | 1985-02-12 | Manufacture of screen for video projector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61182908A true JPS61182908A (en) | 1986-08-15 |
JPH0362129B2 JPH0362129B2 (en) | 1991-09-25 |
Family
ID=12165275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2541485A Granted JPS61182908A (en) | 1985-02-12 | 1985-02-12 | Manufacture of screen for video projector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61182908A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61248707A (en) * | 1985-04-26 | 1986-11-06 | Pioneer Electronic Corp | Manufacture of fresnel lense |
EP0300592A2 (en) * | 1987-06-29 | 1989-01-25 | Nippon Seiki Co. Ltd. | Indicating apparatus |
-
1985
- 1985-02-12 JP JP2541485A patent/JPS61182908A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61248707A (en) * | 1985-04-26 | 1986-11-06 | Pioneer Electronic Corp | Manufacture of fresnel lense |
EP0300592A2 (en) * | 1987-06-29 | 1989-01-25 | Nippon Seiki Co. Ltd. | Indicating apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0362129B2 (en) | 1991-09-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |