JPS5690212A - Digital conversion device - Google Patents

Digital conversion device

Info

Publication number
JPS5690212A
JPS5690212A JP17156879A JP17156879A JPS5690212A JP S5690212 A JPS5690212 A JP S5690212A JP 17156879 A JP17156879 A JP 17156879A JP 17156879 A JP17156879 A JP 17156879A JP S5690212 A JPS5690212 A JP S5690212A
Authority
JP
Japan
Prior art keywords
displacement
differential
capacities
oscillation
equal
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
JP17156879A
Other languages
Japanese (ja)
Inventor
Yuji Doi
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP17156879A priority Critical patent/JPS5690212A/en
Publication of JPS5690212A publication Critical patent/JPS5690212A/en
Pending legal-status Critical Current

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  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

PURPOSE: To improve stability and reduce cost by easing an adverse effect due to various changes with the assistance of a sensor constituted in a differential form and a circuit operating in a differential manner and converting a mechanical displacement directly to a digital signal.
CONSTITUTION: A differential-type electrostatic capacity displacement sensor which has the first electrostatic capacity 11 increased by a displacement on a displacement part on one hand and the second electrostatic capacity 12 reduced on the other hand, is provided. Then a reset signal from a terminal 24 is to reset so that the both electrostatic capacities 11, 12 may be equal when the displacement is at a zero level. Consequently, the oscillation frequencies of oscillation circuits 13, 14 whose oscillation frequency is set by electromagnetic capacities 11, 12 are equal and the output frequecies of the frequency dividing circuits 15, 16 are also equal. A differential signal corresponding to a differential in period of the frequencies of the first and second oscillation circuits 13, 14 which change according to a displacement on the displacement part is sought in a suitable manner to a differential in period of the frequency dividing capacities of the frequency dividing circuits 15, 16. Following this procedure, a displacement value is converted to a digital signal and it is output in response to the differential signal.
COPYRIGHT: (C)1981,JPO&Japio
JP17156879A 1979-12-22 1979-12-22 Digital conversion device Pending JPS5690212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17156879A JPS5690212A (en) 1979-12-22 1979-12-22 Digital conversion device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17156879A JPS5690212A (en) 1979-12-22 1979-12-22 Digital conversion device

Publications (1)

Publication Number Publication Date
JPS5690212A true JPS5690212A (en) 1981-07-22

Family

ID=15925548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17156879A Pending JPS5690212A (en) 1979-12-22 1979-12-22 Digital conversion device

Country Status (1)

Country Link
JP (1) JPS5690212A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142418A (en) * 1983-02-02 1984-08-15 Matsushita Electric Ind Co Ltd Physical quantity detecting device
JPH01277717A (en) * 1988-04-18 1989-11-08 Schutz Im & Exporthandl Bv Capacity displacement meter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533360A (en) * 1976-06-30 1978-01-13 Yokogawa Hokushin Electric Corp Displacement converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533360A (en) * 1976-06-30 1978-01-13 Yokogawa Hokushin Electric Corp Displacement converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142418A (en) * 1983-02-02 1984-08-15 Matsushita Electric Ind Co Ltd Physical quantity detecting device
JPH01277717A (en) * 1988-04-18 1989-11-08 Schutz Im & Exporthandl Bv Capacity displacement meter

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