JPS6489655A - Electronic blackboard device - Google Patents
Electronic blackboard deviceInfo
- Publication number
- JPS6489655A JPS6489655A JP62247063A JP24706387A JPS6489655A JP S6489655 A JPS6489655 A JP S6489655A JP 62247063 A JP62247063 A JP 62247063A JP 24706387 A JP24706387 A JP 24706387A JP S6489655 A JPS6489655 A JP S6489655A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- picture
- comes
- opening
- output signal
- 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
Abstract
PURPOSE:To recognize a hue, and to color-print a picture by positioning an opening and plural filters successively in an optical path as letting them synchronize with the movement of a writing medium. CONSTITUTION:A filter plate 11 rotates as synchronizing with the movement of the writing medium, and the opening 11a and the plural filters 11b, 11c, 11d are switched successively. The respective filters to be used at that time are made to be the one to transmit a color alternatively. Then, all the pictures having passed through the opening 11a are the same for the different colors A, B, C, and output signals corresponding to those are uniform as shown by (e). Next, as for a picture having passed through the first filter 11b, the output signal corresponding to the picture A is lowered lower than others, and comes to be the output signal of (f). Similarly, in the case of the second filter 11c, it comes the output signal as shown by (g), and in the case of the third filter 11d, it comes as shown by (h). By comparing these signals (e)-(h) by a control circuit, the hue of the pictures A, B, C can be discriminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62247063A JPS6489655A (en) | 1987-09-29 | 1987-09-29 | Electronic blackboard device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62247063A JPS6489655A (en) | 1987-09-29 | 1987-09-29 | Electronic blackboard device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6489655A true JPS6489655A (en) | 1989-04-04 |
Family
ID=17157869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62247063A Pending JPS6489655A (en) | 1987-09-29 | 1987-09-29 | Electronic blackboard device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6489655A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479500A (en) * | 1991-03-28 | 1995-12-26 | Canon Kabushiki Kaisha | Communication apparatus |
-
1987
- 1987-09-29 JP JP62247063A patent/JPS6489655A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479500A (en) * | 1991-03-28 | 1995-12-26 | Canon Kabushiki Kaisha | Communication apparatus |
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