EP0607331A1 - Dispositif pour courber un milieu d'enregistrement optique dans le sens de la largeur de celui-ci - Google Patents

Dispositif pour courber un milieu d'enregistrement optique dans le sens de la largeur de celui-ci

Info

Publication number
EP0607331A1
EP0607331A1 EP92922240A EP92922240A EP0607331A1 EP 0607331 A1 EP0607331 A1 EP 0607331A1 EP 92922240 A EP92922240 A EP 92922240A EP 92922240 A EP92922240 A EP 92922240A EP 0607331 A1 EP0607331 A1 EP 0607331A1
Authority
EP
European Patent Office
Prior art keywords
recording medium
optical recording
guide portion
guiding surface
front guiding
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.)
Withdrawn
Application number
EP92922240A
Other languages
German (de)
English (en)
Inventor
Louis F. Schaefer
Eric J. Shrader
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics 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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0607331A1 publication Critical patent/EP0607331A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/605—Guiding record carrier without displacing the guiding means

Definitions

  • the present invention generally relates to a device for use in an optical recording system and, more particularly, to a device for use in, for example, an optical video tape,
  • FIG. 1 a tape 10 is brought into engagement with a read/ write head 12 by way of several movable tape engaging guides 14.
  • the read/write head 12 writes information on the tape 10 and also reads information that is stored on the tape 10.
  • optical recording technology As an alternative to
  • a beam of light e.g. , a laser beam
  • a beam of light is directed at and scans across the width
  • optical recording technology involves the use of a source of
  • the mirror is connected to a suitable operating device (e.g., a motor and control system) that causes the mirror to rotate slightly back and forth.
  • a suitable operating device e.g., a motor and control system
  • the rotation of the mirror causes the light beam to scan back and forth across the width of the tape as the light beam is reflected off the mirror.
  • the light beam reflected from the reflecting device moves in an arcuate path that defines an arc of a circle.
  • the focal point of the light beam must be continually adjusted as the beam scans across the width of the tape. This is so because the focal point of the light beam when the beam is directed at, for example, the middle of the optical tape is different from the focal point of the light beam when the beam is directed at, for example, the edge of the tape.
  • the present invention provides an optical video tape record and playback system that would eliminate the need for complex focusing optics and thereby simplify the overall design of the system. More particularly, the present invention provides a device that imparts curvature across the width of an optical recording medium.
  • the device includes a guide portion that has a front guiding surface along which the optical recording medium is guided. The front guiding surface is concave to cause the
  • the guide to curve across its width as the optical recording medium is guided along the guide portion of the form.
  • the device can include an extension that
  • a system for writing and reading data on an optical recording medium includes a light source for providing a light beam, an arrangement for focusing and directing the beam of light from the light source onto the optical recording medium to produce spots on the optical tape
  • the form includes a guide portion having a front
  • the form can be convex
  • the system can also include two spaced apart guide rollers, each of which is positioned at one end of the guide portion of the form.
  • recording medium includes the steps of withdrawing an optical tape from a feed reel, imparting a curvature across the width of the optical tape by guiding the optical tape
  • the optical recording medium is
  • Figure 1 is a front view of a known read/write head used in systems which store data on a recording tape by way of magnetic storage techniques;
  • Figure 2 is a perspective view of the form according to the present invention, illustrated in conjunction with a portion of an optical video tape record and playback
  • Figure 3 is a schematic illustration of a portion of an optical video tape record
  • Figures 2 and 3 generally speaking, show a portion of a system for optically recording data on an optical recording medium and for reading stored data on the optical
  • the system can, for instance, form a portion of an optical video tape
  • the optical recording medium is a flexible optical tape. While the system includes additional features, those additional features have not
  • the system includes a light source 20. a focusing mechanism 22, a reflecting device 24 and a guide member 26, all of which are preferably
  • optical video tape record and playback unit mounted within a housing (not shown) of the optical video tape record and playback unit.
  • the light source is adapted to produce a light beam 21 , preferably a laser light beam.
  • the light beam 21 produced by the light source 20 is directed at the focusing mechanism
  • the focusing mechanism 22 can be any suitable and known mechanism for use in focusing the light beam from the light source 20.
  • the focused light beam emerging from the focusing mechanism 22 is then directed at the reflecting device 24.
  • the reflecting device 24 can be a mirror or any other suitable device capable of reflecting light.
  • the reflecting device 24 is mounted for rotation and
  • control device 25 controls operation of a motor or other suitable apparatus (not shown) for rotating the reflecting device 24 in
  • the rotation of the reflecting device 24 causes the beam of light 21 to move up and down as shown in Figure 3. In that way. the light beam 21 can scan back and forth across the width of the optical tape as the tape is
  • the amount of rotation of the reflecting device should be sufficient to permit the light beam 21 to scan the entire width of the optical tape.
  • the light beam 21 that is reflected from the reflecting device 24 is directed at the guide member 26.
  • the guide member or form 26 is shown most clearly in Figure 2, the guide member or form 26
  • This guide portion 28 faces in the general direction of the reflecting device 24.
  • the guide portion 28 is convex as seen from above the form 26. Specifically, the
  • the guide po.rtion 28 is provided with a front guiding surface 32 that faces in the direction of the reflecting device 24.
  • the front guiding surface 32 of the guide portion 28 is concavely curved from the top surface 33 of the form 26 to the bottom surface 35 (i.e., as seen from the side of the form 26). More particularly, the front guiding surface 32 is concavely curved away from the reflecting device 24. 5
  • the system can be provided with two reels 34, 36 which, depending upon the direction of movement of the flexible optical tape 30, define a take- up reel and a feed reel. The tape 30 is unwound from one of the reels (e.g. , reel 34), is guided along the front guiding surface 32 of the guide portion 28 of the form 26, and is then wound on the other reel (e.g., reel 36).
  • the concave curvature of the front guiding surface 32 imparts a similar concave curvature across the width of the optical tape 30.
  • the radius of curvature of the front guiding surface 32 is selected such that it is equal to or substantially equal to the distance between the reflecting device and the front guiding surface 32 (as measured along the light beam
  • the light beam 30 reflected from the reflecting device 24 traces an arc of a circle that substantially corresponds to the circular arc defined by the concave front guiding surface 32.
  • the distance between the concave front guiding surface 32 and the reflecting surface of the reflecting device 24 is the same or substantially the
  • the optical tape 30 should preferably be in contact with or substantially in contact with the front guiding surface 32 of the guide portion 28 as the optical tape 30 is guided past the guide portion 28 of the form 26. So long as sufficient tension is applied to the optical tape 30, that objective can be achieved.
  • optical tape 30 is ⁇ n tension as it is wound onto one of the reels 34,
  • the guide portion 28 of the form 26 is convex.
  • the guide portion 28 of the form 26 is positioned slightly forwardly of the reels 34, 36 (i.e. , slightly forwardly in the direction
  • guide rollers 40, 42 can be provided.
  • the guide rollers 40, 42 are preferably
  • a guide element 46 is provided to help guide the tape and prevent it from sliding upwardly along the front guiding surface 32,
  • the guide element 46 can be in the form of an extension member that is connected to the
  • the optical tape 30 is unwound from one of the reels (e.g., reel 34), is guided behind the guide roller 40, is guided along the guiding portion 26, is passed behind the other guide roller 42 and is wound on the other reel 34.
  • the optical tape 30 is in a flat configuration as it moves from the take-off reel 34 and around the guide roller
  • the optical tape 30 begins to curve across its width as it is forced against the front guiding surface 32. As it leaves the form 26, the optical tape 30 once again returns to its flat configuration as it moves behind the guide roller 42. As a result of the foregoing mode of operation, the optical tape 30 is forced against the front guiding surface 32 so that the optical tape 30 is concave across its width.
  • the light beam 21 e.g. , laser beam
  • the light beam 21 scans back and forth across the width of the optical tape 30 (through suitable rotation of the reflecting device) to either write information on the optical tape 30 or to read information that has already been stored on the optical tape 30.
  • the curvature of the front guiding surface 32 matches or substantially matches the arc traced by the scanning light beam 21, the focusing optics, as well as the entire focusing system, can be greatly simplified.
  • the present invention cab be adapted in an optical recording system, that is, an optical video tape record and playback system, to thereby provide a device that imparts curvature across the width of an optical recording medium.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Un dispositif pour courber un milieu d'enregistrement optique (30) dans le sens de la largeur de celui-ci comprend une forme (26) pourvue d'une portion de guidage (28). La portion de guidage (28) a une surface de guidage avant (32) contre laquelle le milieu d'enregistrement optique (30) est guidé. La portion de guidage (28) de la forme (26) est convexe, pendant que la surface de guidage avant (32) de la portion de guidage (28) est concave. La forme concave de la surface de guidage avant (32) fait que le milieu d'enregistrement optique (30) se courbe en prenant une forme concave dans le sens de sa largeur lorsque le milieu d'enregistrement optique (30) est guidé le long de la surface de guidage avant (32).
EP92922240A 1992-05-15 1992-11-03 Dispositif pour courber un milieu d'enregistrement optique dans le sens de la largeur de celui-ci Withdrawn EP0607331A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US88348492A 1992-05-15 1992-05-15
US883484 1992-05-15
PCT/KR1992/000057 WO1993023849A1 (fr) 1992-05-15 1992-11-03 Dispositif pour courber un milieu d'enregistrement optique dans le sens de la largeur de celui-ci

Publications (1)

Publication Number Publication Date
EP0607331A1 true EP0607331A1 (fr) 1994-07-27

Family

ID=25382655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922240A Withdrawn EP0607331A1 (fr) 1992-05-15 1992-11-03 Dispositif pour courber un milieu d'enregistrement optique dans le sens de la largeur de celui-ci

Country Status (3)

Country Link
EP (1) EP0607331A1 (fr)
JP (1) JP2735139B2 (fr)
WO (1) WO1993023849A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1137835A (zh) * 1994-09-16 1996-12-11 菲利浦电子有限公司 用于信息存储和/或再生的系统及用于信息存储和/或再生的带盒
DE10058711A1 (de) * 2000-11-25 2002-08-08 Fujitsu Siemens Computers Gmbh Vorrichtung zur optischen Aufzeichnung und Wiedergabe von Daten
US8036088B1 (en) 2010-06-14 2011-10-11 Oracle International Corporation Optical tape drive movable planarizer subsystem and method for minimizing damage to an optical pickup unit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7601106A (nl) * 1976-02-04 1977-08-08 Philips Nv Magneetbandgeleidingsinrichting.
NL7704581A (nl) * 1977-04-27 1978-10-31 Philips Nv In dwarsrichting aftastend magnetisch band- opname/weergaveapparaat.
DE3479936D1 (en) * 1983-12-12 1989-11-02 Unisys Corp Air bearing for moving webs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9323849A1 *

Also Published As

Publication number Publication date
WO1993023849A1 (fr) 1993-11-25
JP2735139B2 (ja) 1998-04-02
JPH08501177A (ja) 1996-02-06

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