JPS6419941U - - Google Patents
Info
- Publication number
- JPS6419941U JPS6419941U JP11275787U JP11275787U JPS6419941U JP S6419941 U JPS6419941 U JP S6419941U JP 11275787 U JP11275787 U JP 11275787U JP 11275787 U JP11275787 U JP 11275787U JP S6419941 U JPS6419941 U JP S6419941U
- Authority
- JP
- Japan
- Prior art keywords
- value
- projection
- photo sensor
- film
- comparing
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Description
図は、本考案の一実施例の構成図である。
１…サーモクロミツクフイルム、５…駆動装置
、１３…消去ヘツド、１４…サーマルヘツド、１
７…イメージセンサ、２３…投影ミラー（ハーフ
ミラー）、２４…光センサ、２５…制御回路部、
２６…表示部。
The figure is a configuration diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Thermochromic film, 5...Drive device, 13...Erasing head, 14...Thermal head, 1
7... Image sensor, 23... Projection mirror (half mirror), 24... Optical sensor, 25... Control circuit section,
26...Display section.
Claims (1)
に透明となり、予め定められた第２の温度で加熱
すると光学的に不透明となるサーモクロミツクフ
イルムに、原稿画像の読取信号に対応して前記第
２の温度を選択的に印加し画像を形成したものを
投影用フイルムとするオーバーヘツドプロジエク
タにおいて、前記投影用フイルムを透過した光を
投影スクリーンへ向けて反射する投影ミラーをハ
ーフミラーとするとともに、該ハーフミラーの背
面に配置されサーモクロミツクフイルムの透過光
を検出するフオトセンサと、該フオトセンサの検
出値と予め設定された値とを比較する比較手段と
、フオトセンサの検出値が予め設定された値以下
になつたとき報知する手段と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。 A thermochromic film, which becomes optically transparent when heated at a first predetermined temperature and becomes optically opaque when heated at a second predetermined temperature, is coated with the In an overhead projector whose projection film is formed by selectively applying a second temperature to form an image, the projection mirror that reflects the light transmitted through the projection film toward the projection screen is a half mirror. In addition, a photo sensor arranged on the back side of the half mirror detects the transmitted light of the thermochromic film, a comparison means for comparing the detection value of the photo sensor with a preset value, and a comparison means for comparing the detection value of the photo sensor with a preset value. 1. An overhead projector comprising: means for notifying when the value falls below a certain value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11275787U JPS6419941U (en) | 1987-07-24 | 1987-07-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11275787U JPS6419941U (en) | 1987-07-24 | 1987-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6419941U true JPS6419941U (en) | 1989-01-31 |
Family
ID=31351986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11275787U Pending JPS6419941U (en) | 1987-07-24 | 1987-07-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6419941U (en) |
-
1987
- 1987-07-24 JP JP11275787U patent/JPS6419941U/ja active Pending
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