JPH0661872B2 - Fresnel lens - Google Patents
Fresnel lensInfo
- Publication number
- JPH0661872B2 JPH0661872B2 JP10724992A JP10724992A JPH0661872B2 JP H0661872 B2 JPH0661872 B2 JP H0661872B2 JP 10724992 A JP10724992 A JP 10724992A JP 10724992 A JP10724992 A JP 10724992A JP H0661872 B2 JPH0661872 B2 JP H0661872B2
- Authority
- JP
- Japan
- Prior art keywords
- fresnel lens
- resin plate
- curable resin
- transparent resin
- ultraviolet curable
- 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.)
- Expired - Lifetime
Links
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ビデオプロジェクタ
（ビデオ映像光学的投影装置）の光学系の構成部材とし
て透過形スクリーン（通常レンチキュラースクリーンと
呼ばれている）と共に使用されるフレネルレンズ（凸レ
ンズの表面を同心円で分割し、レンズ中心部の厚さを、
レンズの周辺部とほぼ同一にした薄いレンズ）に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Fresnel lens (convex lens) used with a transmissive screen (usually called a lenticular screen) as a component of an optical system of a video projector (video image optical projection device). The surface is divided into concentric circles, and the thickness of the lens center is
A thin lens which is almost the same as the peripheral portion of the lens).
【０００２】[0002]
【従来の技術】従来、この種のフレネルレンズとして
は、変形可能温度に加熱した熱可塑性を有する例えば透
明ポリカーボネート樹脂板または透明アクリル樹脂板
を、あらかじめ所定温度に加熱した一対のフレネルレン
ズ金型間に介挿して所定形状に加圧成形し、金型温度が
約７０℃程度に低下した時点でレンズを金型から取り出
すことによって成形したものが広く用いられている。2. Description of the Related Art Conventionally, as a Fresnel lens of this type, for example, a transparent polycarbonate resin plate or a transparent acrylic resin plate having a thermoplasticity heated to a deformable temperature is preliminarily heated to a predetermined temperature between a pair of Fresnel lens molds. It is widely used that it is inserted into a mold and pressure-molded into a predetermined shape, and the lens is taken out from the mold when the mold temperature is lowered to about 70 ° C.
【０００３】[0003]
【発明が解決しようとする課題】このようなフレネルレ
ンズは、フレネルレンズ金型内で加熱・加圧成形した後
冷却されるために、冷却時に温度の不均一が生じ、レン
ズ自体に反りが発生したり、熱収縮の不均一が発生して
高い精度のフレネルレンズを得ることができなかった。
そこで、例えば特開昭５９−１４１号公報に示されてい
るように金型内に紫外線硬化性樹脂を注入したのち、こ
の樹脂に紫外線を照射し、これを硬化させて成形した紫
外線硬化性樹脂のみでなるフレネルレンズが提案されて
いるが、この場合は、紫外線によって樹脂が硬化するた
め、反りや熱収縮の不均一が発生する恐れはないが、ポ
リカーボネート樹脂またはアクリル樹脂と比較して透明
度が悪く、しかも高価である欠点がある。Such a Fresnel lens is heated and pressure-molded in the Fresnel lens mold and then cooled, so that the temperature becomes nonuniform during cooling and the lens itself warps. However, unevenness of heat shrinkage occurred, and a high-precision Fresnel lens could not be obtained.
Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-141, an ultraviolet-curable resin is injected into a mold, and then this resin is irradiated with ultraviolet rays and cured to cure the ultraviolet-curable resin. Although a Fresnel lens consisting of only is proposed, in this case, the resin is cured by ultraviolet rays, so there is no risk of warpage or uneven heat shrinkage, but the transparency is higher than that of polycarbonate resin or acrylic resin. It has the drawback of being bad and expensive.
【０００４】本発明はかかる点に着目してなされたもの
で、互いに重合接着された透明樹脂板と紫外線硬化性樹
脂とによって、透明度が良好で高精度のフレネルレンズ
を得ることを目的とする。The present invention has been made in view of such a point, and an object thereof is to obtain a Fresnel lens having good transparency and high precision by a transparent resin plate and an ultraviolet curable resin which are polymer-bonded to each other.
【０００５】[0005]
【課題を解決するための手段】本発明に係るフレネルレ
ンズは、透明樹脂板と、この透明樹脂板に重合接着さ
れ、かつ反透明樹脂板側にフレネルレンズ面を有する紫
外線硬化性樹脂とから構成したものである。A Fresnel lens according to the present invention comprises a transparent resin plate and an ultraviolet curable resin which is polymer-bonded to the transparent resin plate and has a Fresnel lens surface on the side opposite to the transparent resin plate. It was done.
【０００６】[0006]
【作用】本発明によれば、互いに重合接着された透明樹
脂板と、紫外線硬化性樹脂とによってフレネルレンズを
構成したので、反りや熱収縮の不均一が発生する恐れが
なく、紫外線硬化性樹脂のみで形成したフレネルレンズ
よりも透明度が向上し、紫外線硬化性樹脂の使用量が半
減する。According to the present invention, since the Fresnel lens is composed of the transparent resin plate polymerized and adhered to each other and the ultraviolet curable resin, there is no fear that warpage or nonuniform heat shrinkage will occur, and the ultraviolet curable resin will not occur. Transparency is improved and the amount of UV curable resin used is halved compared to a Fresnel lens formed by using only.
【０００７】[0007]
実施例１ 以下、図示実施例により本発明を説明する。図１は本発
明の一実施例に係るフレネルレンズの構成を示す断面図
である。図において、１はフレネルレンズであり、アク
リル樹脂板またはポリカーボネート樹脂からなる透明樹
脂板２と、透明樹脂板２に重合接着され、かつ反透明樹
脂板側にフレネルレンズ面３ａを有する紫外線硬化性樹
脂３とから構成されている。Example 1 The present invention will be described below with reference to illustrated examples. FIG. 1 is a sectional view showing the structure of a Fresnel lens according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a Fresnel lens, which is a transparent resin plate 2 made of an acrylic resin plate or a polycarbonate resin, and an ultraviolet curable resin which is polymer-bonded to the transparent resin plate 2 and has a Fresnel lens surface 3a on the side opposite to the transparent resin plate. 3 and 3.
【０００８】図２は本実施例のフレネルレンズの製造に
使用されるフレネルレンズ金型を示す断面図であり、図
中４は下型５と、下型５に着脱自在に重合する上型６と
から形成されたフレネルレンズ金型である。下型５は、
その内面に所定形状のフレネルレンズ面５ａが形成され
るとともに、一側に紫外線硬化性樹脂を注入する注入口
５ｂが、また他側に真空ポンプ（図示せず）によって排
気される排気口５ｃが、それぞれ設けられている。上型
６は、その内周に透明樹脂板２を着脱自在に密に嵌合さ
せるための段部６ａが形成されている。なお、７は紫外
線硬化性樹脂を注入口５ｂから注入するための空洞、８
は空洞７内に注入された紫外線硬化性樹脂（図示せず）
に、透明樹脂板２を介して紫外線９を照射する紫外線照
射装置であり、透明樹脂板２の内面２ａは、空洞７内に
注入されて硬化する紫外線硬化性樹脂との接着性を向上
させるために、放電処理等の加工が施されている。FIG. 2 is a sectional view showing a Fresnel lens mold used for manufacturing the Fresnel lens of this embodiment. In the figure, 4 is a lower mold 5 and an upper mold 6 which is detachably superposed on the lower mold 5. It is a Fresnel lens mold formed from. The lower mold 5 is
A Fresnel lens surface 5a having a predetermined shape is formed on the inner surface thereof, and an injection port 5b for injecting the ultraviolet curable resin is provided on one side and an exhaust port 5c for exhausting by a vacuum pump (not shown) is provided on the other side. , Respectively. The upper mold 6 has a stepped portion 6a formed on the inner periphery thereof so that the transparent resin plate 2 can be detachably and tightly fitted therein. In addition, 7 is a cavity for injecting the ultraviolet curable resin from the injection port 5b, and 8
Is an ultraviolet curable resin (not shown) injected into the cavity 7.
Is an ultraviolet irradiation device that irradiates the ultraviolet rays 9 through the transparent resin plate 2, and the inner surface 2a of the transparent resin plate 2 is for improving the adhesiveness with the ultraviolet curable resin that is injected into the cavity 7 and cured. Are subjected to processing such as electric discharge treatment.
【０００９】次に、本実施例のフレネルレンズを製造す
る手順について説明すると、まず真空ポンプによって排
気口５ｃから空洞７内を真空引きしながら注入口５ｂか
ら紫外線硬化性樹脂を空洞７内に注入する。空洞７内に
紫外線硬化性樹脂が充満すると、これに紫外線照射装置
８から紫外線９を照射し硬化させる。このようにして、
図１に示す如く、フレネルレンズの基本形状部分である
フレネルレンズ面３ａを有する紫外線硬化性樹脂３と、
これに重合接着された透明樹脂板２とから構成されたフ
レネルレンズ１が得られる。Next, the procedure for manufacturing the Fresnel lens of this embodiment will be described. First, while the inside of the cavity 7 is evacuated by the vacuum pump from the exhaust port 5c, the ultraviolet curable resin is injected into the cavity 7 from the injection port 5b. To do. When the cavity 7 is filled with the ultraviolet curable resin, the ultraviolet ray irradiator 8 irradiates the cavity 7 with the ultraviolet ray 9 to cure the resin. In this way
As shown in FIG. 1, an ultraviolet curable resin 3 having a Fresnel lens surface 3a which is a basic shape portion of the Fresnel lens,
A Fresnel lens 1 composed of a transparent resin plate 2 polymerized and adhered to this is obtained.
【００１０】このようにフレネルレンズの基本形状部分
であるフレネルレンズ面３ａを有する紫外線硬化性樹脂
３と、これと互いに重合接着された透明樹脂２とによっ
てフレネルレンズ１を構成したので、反りや熱収縮の不
均一が発生する恐れがなく、高精度のフレネルレンズを
得ることができる。また、紫外線硬化性樹脂のみで形成
した従来のフレネルレンズよりも透明度が向上し、しか
も紫外線硬化性樹脂の使用量が半減するので、フレネル
レンズのコストダウンも図ることができる。As described above, since the Fresnel lens 1 is composed of the ultraviolet curable resin 3 having the Fresnel lens surface 3a which is the basic shape portion of the Fresnel lens and the transparent resin 2 which is polymer-bonded to the ultraviolet curable resin 3, warping and heat are prevented. It is possible to obtain a high-precision Fresnel lens without the risk of uneven contraction. Further, the transparency is improved as compared with the conventional Fresnel lens formed of only the ultraviolet curable resin, and the amount of the ultraviolet curable resin used is halved, so that the cost of the Fresnel lens can be reduced.
【００１１】[0011]
【発明の効果】以上述べたように、本発明によれば、フ
レネルレンズを、透明樹脂板と、この透明樹脂板に重合
接着され、かつ反透明樹脂板側にフレネルレンズ面を有
する紫外線硬化性樹脂とにより構成したので、反りや熱
収縮の不均一が発生する恐れがなく、高精度で透明度の
優れた安価なフレネルレンズを得ることができる。As described above, according to the present invention, a Fresnel lens is provided with a transparent resin plate, which is polymerized and adhered to the transparent resin plate, and has a Fresnel lens surface on the side opposite to the transparent resin plate. Since it is made of resin, it is possible to obtain an inexpensive Fresnel lens with high accuracy and excellent transparency, without the possibility of warpage or nonuniform heat shrinkage.
【図１】本発明の一実施例によるフレネルレンズを示す
断面図である。FIG. 1 is a sectional view showing a Fresnel lens according to an embodiment of the present invention.
【図２】本発明におけるフレネルレンズを製造する場合
に使用されるフレネルレンズ金型を示す断面図である。FIG. 2 is a cross-sectional view showing a Fresnel lens mold used when manufacturing a Fresnel lens according to the present invention.
１ フレネルレンズ ２ 透明樹脂板 ２ａ 内面（接合面） ３ 紫外線硬化性樹脂 ３ａ フレネルレンズ面 1 Fresnel lens 2 Transparent resin plate 2a Inner surface (bonding surface) 3 UV curable resin 3a Fresnel lens surface
Claims (2)
着され、かつ反透明樹脂板側にフレネルレンズ面を有す
る紫外線硬化性樹脂とを備えてなるフレネルレンズ。1. A Fresnel lens comprising a transparent resin plate and an ultraviolet curable resin which is polymer-bonded to the transparent resin plate and has a Fresnel lens surface on the anti-transparent resin plate side.
合面に放電処理を施したことを特徴とする請求項１記載
のフレネルレンズ。2. The Fresnel lens according to claim 1, wherein the transparent resin plate is subjected to an electric discharge treatment on a joint surface with the ultraviolet curable resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10724992A JPH0661872B2 (en) | 1992-04-27 | 1992-04-27 | Fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10724992A JPH0661872B2 (en) | 1992-04-27 | 1992-04-27 | Fresnel lens |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1772085A Division JPS61177215A (en) | 1985-02-02 | 1985-02-02 | Manufacture of fresnel lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05119205A JPH05119205A (en) | 1993-05-18 |
| JPH0661872B2 true JPH0661872B2 (en) | 1994-08-17 |
Family
ID=14454267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10724992A Expired - Lifetime JPH0661872B2 (en) | 1992-04-27 | 1992-04-27 | Fresnel lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0661872B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0770902T3 (en) * | 1995-10-25 | 2004-01-05 | Toppan Printing Co Ltd | Lens-shaped sheet, rear projection screen or television using the same |
-
1992
- 1992-04-27 JP JP10724992A patent/JPH0661872B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05119205A (en) | 1993-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |