JPS5614385A - Encoder unit - Google Patents
Encoder unitInfo
- Publication number
- JPS5614385A JPS5614385A JP9004279A JP9004279A JPS5614385A JP S5614385 A JPS5614385 A JP S5614385A JP 9004279 A JP9004279 A JP 9004279A JP 9004279 A JP9004279 A JP 9004279A JP S5614385 A JPS5614385 A JP S5614385A
- Authority
- JP
- Japan
- Prior art keywords
- reflection
- wave
- waves
- transducers
- dependent
- 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 improve the SN ratio to obtain a high-sensitivity encoder unit, by providing surface wave transducers on the surface and the reverse face in one end part of a glass substrate and by connecting their input ends to a common oscillator and by connecting a differential circuit to receiving output ends.
CONSTITUTION: When an arbitrary select position is pressed with finger 10, main reflection is obtained in contact face (f), however, reflection waves e' and e''' dependent upon end parts e and e" of transducers 12 and 14 and reflection waves c' and c''' dependent upon end parts c and c" of glass sybstrate 8 are generated also. Though e' and e", and c' and c''' out of these reflection waves are different from each other respectively by the surface and the reverse face, they have the same phase and the same amplitude because they are in the same distance from transducers; and therefore, when their difference is taken by a differential amplifier, they are cancelled by each other and only main reflection wave f' is left. Even if they are different in phase and amplitude, their difference is very little. Though wave c' becomes smaller than wave c''' on the reverse face of no main reflection due to the influence of wave f', waves c' and c''' are approximately equal to each other be cause reflection dependent upon the finger is small. Thus, only main reflection can be detected, and the SN ratio can be improved, and a high sensitivity can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9004279A JPS5614385A (en) | 1979-07-16 | 1979-07-16 | Encoder unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9004279A JPS5614385A (en) | 1979-07-16 | 1979-07-16 | Encoder unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5614385A true JPS5614385A (en) | 1981-02-12 |
Family
ID=13987582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9004279A Pending JPS5614385A (en) | 1979-07-16 | 1979-07-16 | Encoder unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5614385A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6090544A (en) * | 1983-10-24 | 1985-05-21 | 横河電機株式会社 | Pain meter |
EP0985206A4 (en) * | 1996-08-12 | 2000-03-15 | Elo Touchsystems Inc | Acoustic condition sensor employing a plurality of mutually non-orthogonal waves |
US8421776B2 (en) | 1996-08-12 | 2013-04-16 | Elo Touch Solutions, Inc. | Acoustic condition sensor employing a plurality of mutually non-orthogonal waves |
-
1979
- 1979-07-16 JP JP9004279A patent/JPS5614385A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6090544A (en) * | 1983-10-24 | 1985-05-21 | 横河電機株式会社 | Pain meter |
EP0985206A4 (en) * | 1996-08-12 | 2000-03-15 | Elo Touchsystems Inc | Acoustic condition sensor employing a plurality of mutually non-orthogonal waves |
EP0985206A1 (en) * | 1996-08-12 | 2000-03-15 | Elo Touchsystems, Inc. | Acoustic condition sensor employing a plurality of mutually non-orthogonal waves |
US8421776B2 (en) | 1996-08-12 | 2013-04-16 | Elo Touch Solutions, Inc. | Acoustic condition sensor employing a plurality of mutually non-orthogonal waves |
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