FR2386805A1 - Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head - Google Patents

Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head

Info

Publication number
FR2386805A1
FR2386805A1 FR7710691A FR7710691A FR2386805A1 FR 2386805 A1 FR2386805 A1 FR 2386805A1 FR 7710691 A FR7710691 A FR 7710691A FR 7710691 A FR7710691 A FR 7710691A FR 2386805 A1 FR2386805 A1 FR 2386805A1
Authority
FR
France
Prior art keywords
tape
proximity
prism
magnetic
recording head
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.)
Granted
Application number
FR7710691A
Other languages
French (fr)
Other versions
FR2386805B1 (en
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.)
Kodak Pathe SA
Original Assignee
Kodak Pathe SA
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 Kodak Pathe SA filed Critical Kodak Pathe SA
Priority to FR7710691A priority Critical patent/FR2386805A1/en
Publication of FR2386805A1 publication Critical patent/FR2386805A1/en
Application granted granted Critical
Publication of FR2386805B1 publication Critical patent/FR2386805B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures

Abstract

The presence or absence of a magnetic tape(5) in a proximity of a read or write head is determined by an electro-optic system. A light source(3) projects a beam through a focussing lens(4) into a prism(1). The prism has a superior surface against which a cylindrical lens(2) abuts. In the absence of a tape, light entering the prism(1) leaves through the cylindrical lens(2) whereas, when tape is present, total internal reflection occurs. In the latter case, light escapes from an inferior surface of the prism(1) to be detected by a control transducer(13) of the recorder. An optical beam splitter(10) permits observation by a user of tape stacks.
FR7710691A 1977-04-08 1977-04-08 Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head Granted FR2386805A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7710691A FR2386805A1 (en) 1977-04-08 1977-04-08 Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7710691A FR2386805A1 (en) 1977-04-08 1977-04-08 Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head

Publications (2)

Publication Number Publication Date
FR2386805A1 true FR2386805A1 (en) 1978-11-03
FR2386805B1 FR2386805B1 (en) 1980-09-26

Family

ID=9189223

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7710691A Granted FR2386805A1 (en) 1977-04-08 1977-04-08 Magnetic tape disposition monitor - provides signal indicative of tape location in proximity of magnetic recording head

Country Status (1)

Country Link
FR (1) FR2386805A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477795A2 (en) * 1990-09-22 1992-04-01 Dainippon Screen Mfg. Co., Ltd. Method and apparatus for measuring electric characteristics of semiconductor wafers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2072037A1 (en) * 1969-12-24 1971-09-24 Ibm
US3696352A (en) * 1970-11-25 1972-10-03 Robatron Veb K Magneto-optical readout beam shifted as a function of information
DE2504199A1 (en) * 1975-02-01 1976-08-19 Springer Ag Verlag Axel Local distribution determination of loading proportion - is subject to surface irregularities of paper or other material to be printed

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2072037A1 (en) * 1969-12-24 1971-09-24 Ibm
US3696352A (en) * 1970-11-25 1972-10-03 Robatron Veb K Magneto-optical readout beam shifted as a function of information
DE2504199A1 (en) * 1975-02-01 1976-08-19 Springer Ag Verlag Axel Local distribution determination of loading proportion - is subject to surface irregularities of paper or other material to be printed

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NV1125/53 *
NV700/71 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477795A2 (en) * 1990-09-22 1992-04-01 Dainippon Screen Mfg. Co., Ltd. Method and apparatus for measuring electric characteristics of semiconductor wafers
EP0477795A3 (en) * 1990-09-22 1993-03-31 Dainippon Screen Mfg. Co., Ltd. Method and apparatus for measuring electric characteristics of semiconductor wafers

Also Published As

Publication number Publication date
FR2386805B1 (en) 1980-09-26

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Legal Events

Date Code Title Description
ST Notification of lapse