JPS55108033A - Keyboard unit - Google Patents
Keyboard unitInfo
- Publication number
- JPS55108033A JPS55108033A JP1438779A JP1438779A JPS55108033A JP S55108033 A JPS55108033 A JP S55108033A JP 1438779 A JP1438779 A JP 1438779A JP 1438779 A JP1438779 A JP 1438779A JP S55108033 A JPS55108033 A JP S55108033A
- Authority
- JP
- Japan
- Prior art keywords
- output
- electrodes
- tracks
- signal
- b1wb3
- 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 reduce the cost and to prevent malfunction, by making different the length of the surface wave propagation path between the input and output electrodes corresponding to each other and of a plurality and connecting the output to common discriminator.
CONSTITUTION: The high frequency signal produced at the AC signal source 1 is inputted to the input electrodes 221W224 of the elastic surface wave element 2 being the pulsive high frequency signal at the gate circuit 13 and converted into elastic surface waves and reaches the output electrodes 231W236 through the propagation of tracks A1WA3 and B1WB3. When the length of tracks A1WA3 and B1WB3 is made different, the output signal appeared at the electrodes 231W233, and 234W236 is the signal different in the delay time respectively. Accordingly, when a finger is touched on, e.g., C11 among the crossing area of each track C11WC13, C21W C23, and C33WC36, the absence of output signal from the electrodes C231 and C234 is discriminated with the discriminators 6, 6A. The discriminator 8 inputs the output of the units 6, 6A to determine which area among the crossing areas of A and B tracks is depressed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1438779A JPS55108033A (en) | 1979-02-13 | 1979-02-13 | Keyboard unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1438779A JPS55108033A (en) | 1979-02-13 | 1979-02-13 | Keyboard unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55108033A true JPS55108033A (en) | 1980-08-19 |
Family
ID=11859639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1438779A Pending JPS55108033A (en) | 1979-02-13 | 1979-02-13 | Keyboard unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55108033A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001090874A1 (en) * | 2000-05-22 | 2001-11-29 | Fujitsu Limited | Touch panel device |
-
1979
- 1979-02-13 JP JP1438779A patent/JPS55108033A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001090874A1 (en) * | 2000-05-22 | 2001-11-29 | Fujitsu Limited | Touch panel device |
US7324096B2 (en) | 2000-05-22 | 2008-01-29 | Fujitsu Limited | Touch panel device |
US7705836B2 (en) | 2000-05-22 | 2010-04-27 | Fujitsu Limited | Touch panel device |
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