JPS55121147A - Detection unit using electroacoustic conversion element - Google Patents
Detection unit using electroacoustic conversion elementInfo
- Publication number
- JPS55121147A JPS55121147A JP2889279A JP2889279A JPS55121147A JP S55121147 A JPS55121147 A JP S55121147A JP 2889279 A JP2889279 A JP 2889279A JP 2889279 A JP2889279 A JP 2889279A JP S55121147 A JPS55121147 A JP S55121147A
- Authority
- JP
- Japan
- Prior art keywords
- change
- vibrator
- detecting
- conversion element
- electroacoustic conversion
- 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
- Wet Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To make a unit constitution small-size and simple and make sure operations possible by detecting physical change of an object on a basis of change of the excitation state caused by the physical action of the object upon an electroacoustic conversion element. CONSTITUTION:Piezo-vibrator 6 is caused to invade into detected object such as a developer consisting of powder or liquid to detect change of the exciting current flowed to the vibrator, thereby detecting the level of detected object 7. Piezo-vibrator 6 is connected to oscillator 9 through resistor 8. For the purpose of detecting change of the exciting current, voltages at both ends of resistor 8 are amplified by amplifier 10. The amplified signal is supplied to comparator 12 through rectifier and smoother 11 and is compared with a reference voltage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2889279A JPS55121147A (en) | 1979-03-13 | 1979-03-13 | Detection unit using electroacoustic conversion element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2889279A JPS55121147A (en) | 1979-03-13 | 1979-03-13 | Detection unit using electroacoustic conversion element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55121147A true JPS55121147A (en) | 1980-09-18 |
Family
ID=12261038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2889279A Pending JPS55121147A (en) | 1979-03-13 | 1979-03-13 | Detection unit using electroacoustic conversion element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55121147A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100212704A1 (en) * | 2006-10-31 | 2010-08-26 | Ugur Kan | Detergent dispenser with agitator current determining fill level |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5210170A (en) * | 1975-07-14 | 1977-01-26 | Furuno Electric Co Ltd | Liquid surface detector |
-
1979
- 1979-03-13 JP JP2889279A patent/JPS55121147A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5210170A (en) * | 1975-07-14 | 1977-01-26 | Furuno Electric Co Ltd | Liquid surface detector |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100212704A1 (en) * | 2006-10-31 | 2010-08-26 | Ugur Kan | Detergent dispenser with agitator current determining fill level |
US8671960B2 (en) * | 2006-10-31 | 2014-03-18 | Arcelik Anonim Sirketi | Detergent dispenser with agitator current determining fill level |
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