JPS55121147A - Detection unit using electroacoustic conversion element - Google Patents

Detection unit using electroacoustic conversion element

Info

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
Application number
JP2889279A
Other languages
Japanese (ja)
Inventor
Akira Shimizu
Hideyuki Kawazu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optic Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optic Co Ltd filed Critical Olympus Optic Co Ltd
Priority to JP2889279A priority Critical patent/JPS55121147A/en
Publication of JPS55121147A publication Critical patent/JPS55121147A/en
Pending legal-status Critical Current

Links

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.
JP2889279A 1979-03-13 1979-03-13 Detection unit using electroacoustic conversion element Pending JPS55121147A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210170A (en) * 1975-07-14 1977-01-26 Furuno Electric Co Ltd Liquid surface detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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