JPS6436832U - - Google Patents
Info
- Publication number
- JPS6436832U JPS6436832U JP13129387U JP13129387U JPS6436832U JP S6436832 U JPS6436832 U JP S6436832U JP 13129387 U JP13129387 U JP 13129387U JP 13129387 U JP13129387 U JP 13129387U JP S6436832 U JPS6436832 U JP S6436832U
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- projection
- fresnel plate
- overhead projector
- transparent original
- 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
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 2
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Description
第１図は、本考案を用いた反射型オーバーヘツ
ドプロジエクタの第１実施例を示す縦断面図であ
る。第２図は、同じく本考案の第２実施例を示す
縦断面図である。第３図は、同じく本考案の第３
実施例を示す縦断面図である。第４図は、同じく
本考案の第４実施例を示す縦断面図である。第５
図は、従来の反射型オーバーヘツドプロジエクタ
の反射フレネル板に透過原稿を湾曲側を上として
載せた状態を示す側面図である。第６図は、従来
の反射型オーバーヘツドプロジエクタの反射フレ
ネル板に透過原稿を湾曲側を下として載せた状態
を示す側面図である。
１……透過原稿、３……反射フレネル板、４…
…本体基部、５……投影ヘツド部、６……支持部
、７……投光ランプ、９……光源リフレクタ、１
０……投影レンズ、１２，１４，１８，２１……
冷却フアン、２２……送風機。
FIG. 1 is a longitudinal sectional view showing a first embodiment of a reflective overhead projector using the present invention. FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention. Figure 3 also shows the third example of the present invention.
FIG. 3 is a longitudinal cross-sectional view showing an example. FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the present invention. Fifth
This figure is a side view showing a state in which a transparent original is placed on a reflective Fresnel plate of a conventional reflective overhead projector with the curved side facing upward. FIG. 6 is a side view showing a state in which a transparent original is placed on a reflective Fresnel plate of a conventional reflective overhead projector with the curved side facing down. 1... Transparent original, 3... Reflective Fresnel plate, 4...
...Main body base, 5...Projection head part, 6...Support part, 7...Flood lamp, 9...Light source reflector, 1
0... Projection lens, 12, 14, 18, 21...
Cooling fan, 22...Blower.
Claims (1)
ネル板上に載せられた透過原稿を照射するランプ
と、このランプにより照射された透過原稿の画像
を投影する光学系を備えた投影ヘツド部と、この
投影ヘツド部を本体基部の上方に支持する支持部
とを有するオーバーヘツドプロジエクタにおいて
、 前記フレネル板に投影のために載せられた透過
原稿の表面に風を送り該風圧により透過原稿をフ
レネル板に密着させる送風機を備えたことを特徴
とするオーバーヘツドプロジエクタ。 (2) 前記送風機は、前記投影ヘツド部内のラン
プの光軸方向後方に位置されるランプ冷却用のフ
アンであり、該フアンの送風方向はランプの投光
方向に一致され且つその送風はランプからの光を
フレネル板に向けて反射するリフレクタを介し透
過原稿の表面に送られるように構成されたことを
特徴とする実用新案登録請求の範囲第１項記載の
オーバーヘツドプロジエクタ。[Claims for Utility Model Registration] (1) A main body base equipped with a Fresnel plate, a lamp for illuminating a transparent original placed on the Fresnel plate, and an optical system for projecting an image of the transparent original illuminated by the lamp. In the overhead projector, which has a projection head section equipped with a projection system and a support section that supports the projection head section above the main body base, air is blown onto the surface of a transparent original placed on the Fresnel plate for projection. An overhead projector characterized by being equipped with a blower that brings a transparent document into close contact with a Fresnel plate by using the air pressure. (2) The blower is a lamp cooling fan located behind the lamp in the optical axis direction of the projection head, and the blowing direction of the fan is aligned with the light projection direction of the lamp, and the blowing air is directed from the lamp. 2. The overhead projector according to claim 1, wherein the overhead projector is configured such that the light is transmitted to the surface of a transparent original through a reflector that reflects the light toward a Fresnel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13129387U JPS6436832U (en) | 1987-08-28 | 1987-08-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13129387U JPS6436832U (en) | 1987-08-28 | 1987-08-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6436832U true JPS6436832U (en) | 1989-03-06 |
Family
ID=31387221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13129387U Pending JPS6436832U (en) | 1987-08-28 | 1987-08-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6436832U (en) |
-
1987
- 1987-08-28 JP JP13129387U patent/JPS6436832U/ja active Pending
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