JPH03127335U - - Google Patents
Info
- Publication number
- JPH03127335U JPH03127335U JP3581490U JP3581490U JPH03127335U JP H03127335 U JPH03127335 U JP H03127335U JP 3581490 U JP3581490 U JP 3581490U JP 3581490 U JP3581490 U JP 3581490U JP H03127335 U JPH03127335 U JP H03127335U
- Authority
- JP
- Japan
- Prior art keywords
- fresnel lens
- projection
- parallel
- overhead projector
- reflecting mirrors
- 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 4
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Description
第１図は本考案の一実施例を示す正面図、第２
図はその側面図、第３図は本考案の主要部をなす
構成図、第４図は従来における投影原理を示す説
明図、第５図はその使用者と視聴者との位置関係
を示す説明図である。
１４……光源、１５……フレンネルレンズ、１
６……投影原画、１９ａ，１９ｂ……反射鏡、２
０ａ，２０ｂ……支持ロツド、２１……焦点調整
用レンズ、２４……ミラー、２５……スクリーン
。
Figure 1 is a front view showing one embodiment of the present invention;
The figure is a side view, Figure 3 is a configuration diagram of the main parts of the present invention, Figure 4 is an explanatory diagram showing the conventional projection principle, and Figure 5 is an explanatory diagram showing the positional relationship between the user and the viewer. It is a diagram. 14...Light source, 15...Fresnel lens, 1
6...Projection original picture, 19a, 19b...Reflector, 2
0a, 20b...Support rod, 21...Focal adjustment lens, 24...Mirror, 25...Screen.
Claims (1)
フレンネルレンズにより集光して投影レンズを介
してミラーにより反射することによりスクリーン
上に前記投影原画の投影像を拡大投影するオーバ
ーヘツドプロジエクタにおいて、前記フレンネル
レズの上部にこのフレンネルレンズ面に対して約
４５°傾斜した互いに平行な２枚の反射鏡を配設
し、これら反射鏡間を２本の平行な支持ロツドに
より接続し、これら支持ロツド間に前記フレンネ
ルレンズ面と平行な方向に移動自在な焦点調整用
レンズを配設したことを特徴とするオーバーヘツ
ドプロジエクタ。 An overhead projector that magnifies and projects a projected image of the projection original onto a screen by condensing light emitted from a light source with a Fresnel lens on which a projection original is placed, and reflecting it by a mirror via the projection lens. In this method, two parallel reflecting mirrors tilted at approximately 45 degrees with respect to the Fresnel lens surface are arranged on the upper part of the Fresnel lens, and these reflecting mirrors are connected by two parallel supporting rods. An overhead projector characterized in that a focus adjusting lens movable in a direction parallel to the Fresnel lens surface is disposed between support rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581490U JPH03127335U (en) | 1990-04-03 | 1990-04-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581490U JPH03127335U (en) | 1990-04-03 | 1990-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03127335U true JPH03127335U (en) | 1991-12-20 |
Family
ID=31541499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3581490U Pending JPH03127335U (en) | 1990-04-03 | 1990-04-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03127335U (en) |
-
1990
- 1990-04-03 JP JP3581490U patent/JPH03127335U/ja active Pending
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