JPS5456327A - Page detecting system - Google Patents
Page detecting systemInfo
- Publication number
- JPS5456327A JPS5456327A JP12250277A JP12250277A JPS5456327A JP S5456327 A JPS5456327 A JP S5456327A JP 12250277 A JP12250277 A JP 12250277A JP 12250277 A JP12250277 A JP 12250277A JP S5456327 A JPS5456327 A JP S5456327A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- light
- tablet
- converted
- output
- 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
Landscapes
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE: To ensure an assured page detection for the tablet with no effect by the external light, by detecting the light emitted from the light emission part where the light corresponding to the fixed frequency is generated and then converting the light into the electric signal to amplify the fixed amount of frequency.
CONSTITUTION: Oscillator 21 always oscillates frequency f1Hz (to be set to 450HzW 455K Hz to avoid the higher harmonic wave of the ceiling lamp), and the output is converted (22) to optical signal 24 to reach light receiving part 23 after amplification 26. At the same time, external light 25 arrives at part 23, and the output is amplified (26) and then converted (27) to make tablet device 1 perform the page detection for tablet 2. Characteristics 50 resonated with frequency f1 is provided to amplifier 26, and the gain is set large near frequency f1 and set small at the place away from f1, thus only the desired signal being extracted. Thus, the misdetection caused by the too bright periphery of device 1 can be prevented
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12250277A JPS5456327A (en) | 1977-10-14 | 1977-10-14 | Page detecting system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12250277A JPS5456327A (en) | 1977-10-14 | 1977-10-14 | Page detecting system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5456327A true JPS5456327A (en) | 1979-05-07 |
Family
ID=14837423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12250277A Pending JPS5456327A (en) | 1977-10-14 | 1977-10-14 | Page detecting system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5456327A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4973960A (en) * | 1989-02-24 | 1990-11-27 | Amoco Corporation | Data entry method and apparatus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4930375A (en) * | 1970-06-23 | 1974-03-18 | ||
JPS4930735A (en) * | 1972-07-24 | 1974-03-19 | ||
JPS5215230A (en) * | 1975-07-28 | 1977-02-04 | Nec Corp | Data making unit |
-
1977
- 1977-10-14 JP JP12250277A patent/JPS5456327A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4930375A (en) * | 1970-06-23 | 1974-03-18 | ||
JPS4930735A (en) * | 1972-07-24 | 1974-03-19 | ||
JPS5215230A (en) * | 1975-07-28 | 1977-02-04 | Nec Corp | Data making unit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4973960A (en) * | 1989-02-24 | 1990-11-27 | Amoco Corporation | Data entry method and apparatus |
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