JPH0267326U - - Google Patents
Info
- Publication number
- JPH0267326U JPH0267326U JP1988145993U JP14599388U JPH0267326U JP H0267326 U JPH0267326 U JP H0267326U JP 1988145993 U JP1988145993 U JP 1988145993U JP 14599388 U JP14599388 U JP 14599388U JP H0267326 U JPH0267326 U JP H0267326U
- Authority
- JP
- Japan
- Prior art keywords
- lens
- image generation
- generation source
- sheet
- projection device
- 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
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Description
第１図は本考案になる背面投写装置の一実施例
の構造を示す水平断面図、第２図はその透過式ス
クリーンの下端部の縦断面図、第３図は従来の背
面投写装置の構造を示す水平断面図、第４図はそ
の背面投写装置をキヤビネツト内に配設した状態
を示す図、第５図は第４図に示す背面投写装置を
正面上方より見た斜視図、第６図乃至第８図は２
重像及び３重像の発生原因を説明するための図で
ある。
１……背面投写装置、２……画像発生源、３…
…投写レンズ、４……透過式スクリーン、５……
フレネルシート、６……フロントシート、７……
監視者、８……入射面、９……フレネルレンズ面
、９ｄ……有効レンズ面、９ｅ，９ｇ……非レン
ズ面、９ｆ……光吸収膜、１０，１１……レンチ
キユラー面（レンチキユラーレンズ）、１２……
ブラツクストライプ。
FIG. 1 is a horizontal sectional view showing the structure of an embodiment of the rear projection device according to the present invention, FIG. 2 is a vertical sectional view of the lower end of the transmission screen, and FIG. 3 is the structure of a conventional rear projection device. FIG. 4 is a view showing the rear projection device installed in the cabinet, FIG. 5 is a perspective view of the rear projection device shown in FIG. 4, viewed from above, and FIG. 2 to Figure 8
FIG. 3 is a diagram for explaining the cause of occurrence of double images and triple images. 1... Rear projection device, 2... Image generation source, 3...
...Projection lens, 4... Transparent screen, 5...
Fresnel seat, 6...Front seat, 7...
Observer, 8...Incidence surface, 9...Fresnel lens surface, 9d...Effective lens surface, 9e, 9g...Non-lens surface, 9f...Light absorption film, 10, 11... Lenticular surface (lenticular surface) lens), 12...
black stripe.
Claims (1)
投写レンズと、この投写レンズの結像面に設けた
透過式スクリーンとより成り、 この透過式スクリーンは少なくとも２枚以上の
シートから構成され、そのシートのうち光路上最
も前記画像発生源に近い第１のシートは、入射面
及び／または出射面にフレネルレンズを備え、前
記２枚以上のシートのうち光路上最も前記画像発
生源から遠い第２のシートは、入射面及び／また
は出射面に光を水平方向に拡散するレンチキユラ
ーレンズを備えた背面投写装置であつて、 前記フレネルレンズを構成する各有効レンズ面
をつなぐ非レンズ面のうち、前記透過式スクリー
ンの周辺部に位置する非レンズ面上に、光吸収膜
を設けたことを特徴とする背面投写装置。[Claims for Utility Model Registration] Consists of an image generation source, a projection lens provided in front of the image generation source, and a transmissive screen provided on the image forming surface of the projection lens, the transmissive screen comprising at least two The first sheet, which is closest to the image generation source on the optical path, is provided with a Fresnel lens on the incident surface and/or the exit surface, and among the two or more sheets, the first sheet is closest to the image generation source on the optical path. A second sheet furthest from the image generation source is a rear projection device equipped with a lenticular lens that horizontally diffuses light on an incident surface and/or an exit surface, and each effective lens constituting the Fresnel lens A rear projection device characterized in that a light absorbing film is provided on a non-lens surface located at a peripheral portion of the transmission screen among non-lens surfaces connecting lens surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988145993U JPH0267326U (en) | 1988-11-10 | 1988-11-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988145993U JPH0267326U (en) | 1988-11-10 | 1988-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0267326U true JPH0267326U (en) | 1990-05-22 |
Family
ID=31415075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988145993U Pending JPH0267326U (en) | 1988-11-10 | 1988-11-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0267326U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006162830A (en) * | 2004-12-06 | 2006-06-22 | Seiko Epson Corp | Screen and image display device |
| JP2014191285A (en) * | 2013-03-28 | 2014-10-06 | Shimadzu Corp | Rear projection type display apparatus and fresnel lens used for the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61130903A (en) * | 1984-11-30 | 1986-06-18 | Hitachi Ltd | Fresnel lens and its production |
| JPS62178227A (en) * | 1986-01-28 | 1987-08-05 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Rear projection unit |
-
1988
- 1988-11-10 JP JP1988145993U patent/JPH0267326U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61130903A (en) * | 1984-11-30 | 1986-06-18 | Hitachi Ltd | Fresnel lens and its production |
| JPS62178227A (en) * | 1986-01-28 | 1987-08-05 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Rear projection unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006162830A (en) * | 2004-12-06 | 2006-06-22 | Seiko Epson Corp | Screen and image display device |
| JP2014191285A (en) * | 2013-03-28 | 2014-10-06 | Shimadzu Corp | Rear projection type display apparatus and fresnel lens used for the same |
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