FR2357029A1 - Detection des trous d'index pour support d'enregistrem ent magnetique - Google Patents

Detection des trous d'index pour support d'enregistrem ent magnetique

Info

Publication number
FR2357029A1
FR2357029A1 FR7716790A FR7716790A FR2357029A1 FR 2357029 A1 FR2357029 A1 FR 2357029A1 FR 7716790 A FR7716790 A FR 7716790A FR 7716790 A FR7716790 A FR 7716790A FR 2357029 A1 FR2357029 A1 FR 2357029A1
Authority
FR
France
Prior art keywords
magnetic
particle size
marker holes
optical scanning
wavelength characteristic
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
FR7716790A
Other languages
English (en)
French (fr)
Other versions
FR2357029B1 (enrdf_load_stackoverflow
Inventor
Ronald J Keller
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of FR2357029A1 publication Critical patent/FR2357029A1/fr
Application granted granted Critical
Publication of FR2357029B1 publication Critical patent/FR2357029B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G11B27/26—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording by photoelectric detection, e.g. of sprocket holes

Landscapes

  • Optical Transform (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Paints Or Removers (AREA)
FR7716790A 1976-06-30 1977-05-25 Detection des trous d'index pour support d'enregistrem ent magnetique Granted FR2357029A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70131876A 1976-06-30 1976-06-30

Publications (2)

Publication Number Publication Date
FR2357029A1 true FR2357029A1 (fr) 1978-01-27
FR2357029B1 FR2357029B1 (enrdf_load_stackoverflow) 1980-02-08

Family

ID=24816885

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7716790A Granted FR2357029A1 (fr) 1976-06-30 1977-05-25 Detection des trous d'index pour support d'enregistrem ent magnetique

Country Status (4)

Country Link
JP (1) JPS533307A (enrdf_load_stackoverflow)
DE (1) DE2720164A1 (enrdf_load_stackoverflow)
FR (1) FR2357029A1 (enrdf_load_stackoverflow)
IT (1) IT1115670B (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
IT1115670B (it) 1986-02-03
FR2357029B1 (enrdf_load_stackoverflow) 1980-02-08
JPS533307A (en) 1978-01-13
DE2720164A1 (de) 1978-01-12

Similar Documents

Publication Publication Date Title
GB1560010A (en) Light-emitting display device
EP0375298A3 (en) Optical information recording media
EP0354601A3 (en) Optical information recording medium providing reflected light at two different wavelengths, reproducing apparatus and method utilizing the same
JPS57165292A (en) Optical information recording medium
GB1520235A (en) Optical signal storage discs
ES494877A0 (es) Un disco de registro optico
CA1207443A (en) Optically readable record carriers
JPS5532238A (en) Optical recorder and reproducing method
CA2000597A1 (en) Optical recording element
FR2357029A1 (fr) Detection des trous d'index pour support d'enregistrem ent magnetique
JPS5683841A (en) Base film for magnetic recording
AU3440884A (en) Reading an optical disk
AU574523B2 (en) Thermal recording medium and method
US3959655A (en) Light source for optical sound recording and reproduction apparatus
JPS57212642A (en) Recording medium
JPS5331105A (en) Information recording member
US3619516A (en) Electroluminescent diode sound reproducing system
EP0884724A3 (en) Optical discs
US5305301A (en) Optically readable record carriers
JPS5690439A (en) Material for reproducing optical signal records
US3530259A (en) Electroluminescent diode and sound recording system with controlled maximum light intensity
JPS5587332A (en) Magnetic light recording medium
JPH027249A (ja) 光ディスクの製造方法
US2644857A (en) Recording and reproducing sound
JPS5580832A (en) Wavelength multiple record/reproduction system

Legal Events

Date Code Title Description
ST Notification of lapse