JPS6426703U - - Google Patents
Info
- Publication number
- JPS6426703U JPS6426703U JP12037987U JP12037987U JPS6426703U JP S6426703 U JPS6426703 U JP S6426703U JP 12037987 U JP12037987 U JP 12037987U JP 12037987 U JP12037987 U JP 12037987U JP S6426703 U JPS6426703 U JP S6426703U
- Authority
- JP
- Japan
- Prior art keywords
- fresnel lens
- circular
- lens
- fresnel
- focal length
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Description
第１図は本考案のフレネルレンズの断面図を示
した図である。第２図は入射面におけるフレネル
レンズの構成を示す図である。第３図は、本考案
に係るフレネルレンズに光を入射したときにその
光路を示したもので、フレネルレンズの一部を拡
大した図である。第４図は、本考案に係るフレネ
ルレンズを用いた透過型スクリーンの概略構成図
である。第５図及び第６図は透過型スクリーンの
模式的な構成例を示した図である。第７図は入射
面における光量損失を説明するための図である。
第８図及び第９図は、出射面における光量損失を
説明するための図である。
１：入射面側のサーキユラーフレネルレンズ、
２：出射面側のサーキユラーフレネルレンズ、３
：フレネルレンズの基材、１０：レンズ単位、１
１：レンズ面、１２：非レンズ面、２０：フレネ
ルレンズ、２１：レンチキユラーレンズ板。
FIG. 1 is a cross-sectional view of the Fresnel lens of the present invention. FIG. 2 is a diagram showing the structure of a Fresnel lens on the entrance plane. FIG. 3 shows the optical path of light when it enters the Fresnel lens according to the present invention, and is an enlarged view of a part of the Fresnel lens. FIG. 4 is a schematic diagram of a transmission screen using a Fresnel lens according to the present invention. FIG. 5 and FIG. 6 are diagrams showing a typical configuration example of a transmission screen. FIG. 7 is a diagram for explaining the loss of light amount on the incident plane.
FIG. 8 and FIG. 9 are diagrams for explaining light amount loss at the exit surface. 1: Circular Fresnel lens on the entrance surface side,
2: Circular Fresnel lens on the exit surface side, 3
: Fresnel lens base material, 10: Lens unit, 1
1: Lens surface, 12: Non-lens surface, 20: Fresnel lens, 21: Lenticular lens plate.
Claims (1)
ネルレンズが形成されているフレネルレンズであ
つて、 入射側のサーキユラーフレネルレンズの焦点距
離が出射側のサーキユラーフレネルレンズの焦点
距離より長くなつており、しかも出射側のフレネ
ルレンズでは各レンズ単位の抜きテーパーが大き
くとつてあることを特徴とするフレネルレンズ。 (2) 両面のサーキユラーフレネルレンズの中心
が一致していることを特徴とするフレネルレンズ
実用新案登録請求の範囲第１項記載のフレネルレ
ンズ。[Scope of Claim for Utility Model Registration] (1) A Fresnel lens in which circular Fresnel lenses are formed on both the entrance surface and the exit surface, where the focal length of the circular Fresnel lens on the entrance side is the circular Fresnel lens on the exit side. A Fresnel lens whose focal length is longer than that of a Fresnel lens, and which is characterized by a large taper for each lens unit on the output side of the Fresnel lens. (2) The Fresnel lens according to claim 1, wherein the centers of the circular Fresnel lenses on both sides coincide with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12037987U JPS6426703U (en) | 1987-08-07 | 1987-08-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12037987U JPS6426703U (en) | 1987-08-07 | 1987-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6426703U true JPS6426703U (en) | 1989-02-15 |
Family
ID=31366433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12037987U Pending JPS6426703U (en) | 1987-08-07 | 1987-08-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6426703U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH047987A (en) * | 1990-04-25 | 1992-01-13 | Pioneer Electron Corp | Rear projection television |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61129602A (en) * | 1984-11-29 | 1986-06-17 | Nissan Motor Co Ltd | Construction of fresnel lens |
| JPS62118304A (en) * | 1985-11-18 | 1987-05-29 | Asahi Optical Co Ltd | Fresnel lens |
-
1987
- 1987-08-07 JP JP12037987U patent/JPS6426703U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61129602A (en) * | 1984-11-29 | 1986-06-17 | Nissan Motor Co Ltd | Construction of fresnel lens |
| JPS62118304A (en) * | 1985-11-18 | 1987-05-29 | Asahi Optical Co Ltd | Fresnel lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH047987A (en) * | 1990-04-25 | 1992-01-13 | Pioneer Electron Corp | Rear projection television |
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