JPS55160379A - Display unit for residual quantity of tape - Google Patents

Display unit for residual quantity of tape

Info

Publication number
JPS55160379A
JPS55160379A JP6763479A JP6763479A JPS55160379A JP S55160379 A JPS55160379 A JP S55160379A JP 6763479 A JP6763479 A JP 6763479A JP 6763479 A JP6763479 A JP 6763479A JP S55160379 A JPS55160379 A JP S55160379A
Authority
JP
Japan
Prior art keywords
tape
residual quantity
display unit
light emitting
emitting diode
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
JP6763479A
Other languages
Japanese (ja)
Inventor
Shugoro Harihara
Akira Sasaki
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 JP6763479A priority Critical patent/JPS55160379A/en
Publication of JPS55160379A publication Critical patent/JPS55160379A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To prevent malfunction by drawing viewers' attention by providing a cassette tape with the method of detecting the residual quantity of the tape, the method of generating digital information, the method of driving display elements, the method of providing flashing display when the residual quantity reaches a fixed value, etc.
CONSTITUTION: The display unit for the residual quantity of a tape consists of reel turntable 1, light emitting diode 3 for detecting its turning speed, phototransistor 4, pulse amplifier 5, waveform-shaping methods 6, 7 and 8, peak detector 11, DC amplifier 11, display unit 14 equipped with a light emitting diode, etc. Further, DC amplifier 11 is applied with a bias equivalent to the cassette tape. Therefore, even when the output of peak detector 10 decreases gradually as reel turntable 1 turns, a DC voltage adjusted to a value adequate for the time display of the residual quantity of the tape is supplied to AD converter 13 and in display unit 14, the light emitting diode comes on-off according to the residual quantity of the tape.
COPYRIGHT: (C)1980,JPO&Japio
JP6763479A 1979-05-30 1979-05-30 Display unit for residual quantity of tape Pending JPS55160379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6763479A JPS55160379A (en) 1979-05-30 1979-05-30 Display unit for residual quantity of tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6763479A JPS55160379A (en) 1979-05-30 1979-05-30 Display unit for residual quantity of tape

Publications (1)

Publication Number Publication Date
JPS55160379A true JPS55160379A (en) 1980-12-13

Family

ID=13350607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6763479A Pending JPS55160379A (en) 1979-05-30 1979-05-30 Display unit for residual quantity of tape

Country Status (1)

Country Link
JP (1) JPS55160379A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834199U (en) * 1981-08-31 1983-03-05 カシオ計算機株式会社 electronic musical instruments
JPS60186587U (en) * 1984-05-19 1985-12-10 株式会社ケンウッド record player

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834199U (en) * 1981-08-31 1983-03-05 カシオ計算機株式会社 electronic musical instruments
JPH028319Y2 (en) * 1981-08-31 1990-02-27
JPS60186587U (en) * 1984-05-19 1985-12-10 株式会社ケンウッド record player

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