WO2007057862A1 - Method for determining whether a same disc is loaded in an optical drive. - Google Patents

Method for determining whether a same disc is loaded in an optical drive. Download PDF

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Publication number
WO2007057862A1
WO2007057862A1 PCT/IB2006/054313 IB2006054313W WO2007057862A1 WO 2007057862 A1 WO2007057862 A1 WO 2007057862A1 IB 2006054313 W IB2006054313 W IB 2006054313W WO 2007057862 A1 WO2007057862 A1 WO 2007057862A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
optical drive
command
time interval
ejection
Prior art date
Application number
PCT/IB2006/054313
Other languages
French (fr)
Inventor
Rudi Blok
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to JP2008540770A priority Critical patent/JP5236480B2/en
Priority to CN2006800435596A priority patent/CN101313361B/en
Priority to AT06821482T priority patent/ATE441924T1/en
Priority to EP06821482A priority patent/EP1955326B1/en
Priority to US12/094,415 priority patent/US9245576B2/en
Priority to DE602006008978T priority patent/DE602006008978D1/en
Publication of WO2007057862A1 publication Critical patent/WO2007057862A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/06—Control of operating function, e.g. switching from recording to reproducing by counting or timing of machine operations
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing

Definitions

  • the present invention relates to a method for determining whether a same disc is loaded in an optical drive.
  • the first step to be performed is to recognize the disc present in the drive.
  • the disc recognition procedure involves operations which namely consist of selection of a laser (CD, DVD or BluRay laser) to start disc recognition by way of a substrate thickness measurement, reflection measurement at non-rotating disc, spherical aberration control during disc recognition and initializations, presets, and calibrations of various items such as focus offset, radial tilt, tangential tilt and spherical aberration.
  • a laser CD, DVD or BluRay laser
  • timing performance is an important property of an optical drive, the duration and/or number of operations mentioned above should be kept to a minimum.
  • US Patent 5,974,016 discloses a disc drive equipped with an automatic closing tray wherein a delay is set before the tray is closed, said delay depending on the presence in the tray of an old or a new disc or if the tray is empty.
  • a plurality of sensors at a nest in the tray senses the presence of a disc in the nest and also whether the disc is correctly positioned.
  • the invention proposes a method for determining whether a same disc is loaded in an optical drive, said method comprising a step of measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and a step of comparing said time interval with a predefined value, wherein said disc is meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
  • Said predefined value corresponds to the time needed for a user to exchange a disc in the optical drive. Therefore, if said time interval is actually smaller than said predefined value, one can assume that the user did not have enough time to exchange the disc and the same disc is still loaded.
  • the optical drive can re-use some of the disc settings resulting of disc recognition operations previously performed for the same disc, as selection of the correct laser, spherical aberration measurement, radial tilt calibration.
  • the disc insertion event is the disc insertion command or a disc insertion start or a disc insertion completion and the disc ejection event is the disc ejection command or a disc ejection start or a disc ejection completion.
  • the invention also relates to an optical drive comprising means for determining whether a same disc is loaded in said optical drive, said optical drive comprising means for measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and means for comparing said time interval with a predefined value, said disc being meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
  • the invention also relates to a computer program for performing the steps of the method in accordance with the invention.
  • the invention can be used in all optical drives should they be equipped with a moving tray or not.
  • Figure 1 is a chronogram showing the different stages of the motion of a disc in an optical drive.
  • the ejection of a disc in an optical drive starts with an eject_command given at time T ⁇ J ⁇ ct_command by the user of the optical drive.
  • the disc starts being ejected at time
  • I eject_start- Ejection of the disc ends at time T ⁇ J ⁇ ct_fin ⁇ sh ⁇ d-
  • the duration of the ejection phase is equal to T ⁇ J ⁇ C t_fin ⁇ shed - T ⁇ J ⁇ C t_ s tart and depends on the manufacturer of the drive.
  • the drive remains in an ejection position until the user gives an insert_command at time T ⁇ n sert_command after having taken the disc out of the drive or not.
  • the insertion phase starts at time T ⁇ n sert_start, a short delay or not after T inS ert_command, ends at time T inS ert_finish e d and thus lasts during time interval Tmsertjinished - T ⁇ n sert_start, depending on the manufacturer of the drive.
  • the invention states that the same disc is still in the optical drive if said insert_command was given shortly after an event took place resulting from an eject_command, i.e after a time interval smaller than a predefined value.
  • the relevant time interval can be defined as T inS ert_command - T ⁇ J ⁇ ct_fin ⁇ sh ⁇ d calculated after ejection is completed.
  • this time interval is smaller than about 0.5 second the same disc is still in the drive and is being re-inserted, with all the advantageous consequences about the disc recognition operations which are substantially simplified as above explained.
  • the relevant time interval to be considered can be otherwise defined. For example, its origin may be taken at either T ⁇ J ⁇ C t_command or T ⁇ J ⁇ C t_ s tart which make it possible to account for an insert_command given before ejection is completed. Likewise, the termination of said relevant time interval may be taken as T ⁇ n sert_start or T inS ert_finished. Naturally, in those cases, the predifined reference value should be calculated accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Cable Accessories (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Feeding And Guiding Record Carriers (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

The invention relates to a method for determining whether a same disc is loaded in an optical drive. The method comprises a step of measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command. It further comprises a step of comparing said time interval with a predefined value. The disc is meant as still loaded in said optical drive if said time interval is smaller than said predefined value.

Description

METHOD FOR DETERMINING WHETHER A SAME DISC IS LOADED IN AN
OPTICAL DRIVE
FIELD OF THE INVENTION
The present invention relates to a method for determining whether a same disc is loaded in an optical drive.
BACKGROUND OF THE INVENTION
When a disc is loaded in an optical drive, by means of a tray or not, the first step to be performed is to recognize the disc present in the drive.
The disc recognition procedure involves operations which namely consist of selection of a laser (CD, DVD or BluRay laser) to start disc recognition by way of a substrate thickness measurement, reflection measurement at non-rotating disc, spherical aberration control during disc recognition and initializations, presets, and calibrations of various items such as focus offset, radial tilt, tangential tilt and spherical aberration.
Performing all these operations actually takes a significant amount of time. As timing performance is an important property of an optical drive, the duration and/or number of operations mentioned above should be kept to a minimum.
On the other hand, it is apparent that time could be saved in circumstances where a same disc is still present in the optical drive although the user has given an ejection command but without changing the current disc.
Indeed, under those circumstances, several operations may be skipped such as substrate thickness measurement for selecting the correct laser, spherical aberration adjustment, and radial tilt calibration. Thus, it can be readily understood that determining whether a same disc is still present in an optical drive may be of the upper importance in assessing the timing performance of an optical drive.
In that context, US Patent 5,974,016 discloses a disc drive equipped with an automatic closing tray wherein a delay is set before the tray is closed, said delay depending on the presence in the tray of an old or a new disc or if the tray is empty. For that purpose, a plurality of sensors at a nest in the tray senses the presence of a disc in the nest and also whether the disc is correctly positioned.
However, it will be appreciated that providing an optical drive with sensors specially dedicated to the determination that a same disc is still present in the drive results in additional costs and technical complexity that are generally hoped to be saved.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method for determining whether a same disc is loaded in an optical drive which would be simpler to carry out that the known above-mentioned solution.
To this end, the invention proposes a method for determining whether a same disc is loaded in an optical drive, said method comprising a step of measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and a step of comparing said time interval with a predefined value, wherein said disc is meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
Said predefined value corresponds to the time needed for a user to exchange a disc in the optical drive. Therefore, if said time interval is actually smaller than said predefined value, one can assume that the user did not have enough time to exchange the disc and the same disc is still loaded.
As a consequence, since it is determined by virtue of the method in accordance with the invention that the same disc is loaded, the optical drive can re-use some of the disc settings resulting of disc recognition operations previously performed for the same disc, as selection of the correct laser, spherical aberration measurement, radial tilt calibration.
According to various embodiments of the invention, the disc insertion event is the disc insertion command or a disc insertion start or a disc insertion completion and the disc ejection event is the disc ejection command or a disc ejection start or a disc ejection completion.
The invention also relates to an optical drive comprising means for determining whether a same disc is loaded in said optical drive, said optical drive comprising means for measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and means for comparing said time interval with a predefined value, said disc being meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
The invention also relates to a computer program for performing the steps of the method in accordance with the invention.
In addition, it is to be noted that the invention can be used in all optical drives should they be equipped with a moving tray or not.
These and other aspects of the invention will be apparent from and will be elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail by way of example with reference to the accompanying drawing :
Figure 1 is a chronogram showing the different stages of the motion of a disc in an optical drive.
DETAILED DESCRIPTION OF THE INVENTION
As shown in figure 1 , the ejection of a disc in an optical drive starts with an eject_command given at time TΘJΘct_command by the user of the optical drive. At the same time or after a short delay, the disc starts being ejected at time
I eject_start- Ejection of the disc ends at time TΘJΘct_finιshΘd- The duration of the ejection phase is equal to TΘJΘCt_finιshed - TΘJΘCt_start and depends on the manufacturer of the drive.
The drive remains in an ejection position until the user gives an insert_command at time Tιnsert_command after having taken the disc out of the drive or not. The insertion phase starts at time Tιnsert_start, a short delay or not after TinSert_command, ends at time TinSert_finished and thus lasts during time interval Tmsertjinished - Tιnsert_start, depending on the manufacturer of the drive.
In order to determine whether the same disc is still in the optical drive at time TinSert_command when the insert_command is given by the user, the invention states that the same disc is still in the optical drive if said insert_command was given shortly after an event took place resulting from an eject_command, i.e after a time interval smaller than a predefined value.
In practice, the relevant time interval can be defined as TinSert_command - TΘJΘct_finιshΘd calculated after ejection is completed. Typically, one may assume that if this time interval is smaller than about 0.5 second the same disc is still in the drive and is being re-inserted, with all the advantageous consequences about the disc recognition operations which are substantially simplified as above explained.
The relevant time interval to be considered can be otherwise defined. For example, its origin may be taken at either TΘJΘCt_command or TΘJΘCt_start which make it possible to account for an insert_command given before ejection is completed. Likewise, the termination of said relevant time interval may be taken as Tιnsert_start or TinSert_finished. Naturally, in those cases, the predifined reference value should be calculated accordingly.

Claims

1. A method for determining whether a same disc is loaded in an optical drive, said method comprising a step of measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and a step of comparing said time interval with a predefined value, wherein said disc is meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
2. A method as claimed in claim 1 , wherein said disc insertion event is said disc insertion command.
3. A method as claimed in claim 1 , wherein said disc insertion event is a disc insertion start.
4. A method as claimed in claim 1 , wherein said disc insertion event is a disc insertion completion.
5. A method as claimed in claim 1 , wherein said disc ejection event is said disc ejection command.
6. A method as claimed in claim 1 , wherein said disc ejection event is a disc ejection start.
7. A method as claimed in claim 1 , wherein said disc ejection event is a disc ejection completion.
8. An optical drive comprising means for determining whether a same disc is loaded in said optical drive, said optical drive comprising means for measuring a time interval between a disc insertion event resulting from a disc insertion command and a disc ejection event resulting from a disc ejection command, and means for comparing said time interval with a predefined value, said disc being meant as still loaded in said optical drive if said time interval is smaller than said predefined value.
9. A computer program for performing the steps of the method as claimed in claim 1.
PCT/IB2006/054313 2005-11-21 2006-11-17 Method for determining whether a same disc is loaded in an optical drive. WO2007057862A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2008540770A JP5236480B2 (en) 2005-11-21 2006-11-17 Method for determining whether the same optical disc is loaded in an optical disc drive
CN2006800435596A CN101313361B (en) 2005-11-21 2006-11-17 Method for determining whether a same disc is loaded in an optical drive
AT06821482T ATE441924T1 (en) 2005-11-21 2006-11-17 METHOD FOR DETERMINING THE CHARGE CONDITION OF A DISK IN AN OPTICAL DRIVE
EP06821482A EP1955326B1 (en) 2005-11-21 2006-11-17 Method for determining whether a same disc is loaded in an optical drive.
US12/094,415 US9245576B2 (en) 2005-11-21 2006-11-17 Method for determining whether a same disc is loaded in an optical drive
DE602006008978T DE602006008978D1 (en) 2005-11-21 2006-11-17 METHOD FOR DETERMINING THE LOADING STATE OF A PLATE IN AN OPTICAL DRIVE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05300951.0 2005-11-21
EP05300951 2005-11-21

Publications (1)

Publication Number Publication Date
WO2007057862A1 true WO2007057862A1 (en) 2007-05-24

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Application Number Title Priority Date Filing Date
PCT/IB2006/054313 WO2007057862A1 (en) 2005-11-21 2006-11-17 Method for determining whether a same disc is loaded in an optical drive.

Country Status (10)

Country Link
US (1) US9245576B2 (en)
EP (1) EP1955326B1 (en)
JP (1) JP5236480B2 (en)
KR (1) KR20080070075A (en)
CN (1) CN101313361B (en)
AT (1) ATE441924T1 (en)
DE (1) DE602006008978D1 (en)
MY (1) MY147823A (en)
TW (1) TW200739520A (en)
WO (1) WO2007057862A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103426445A (en) * 2012-05-17 2013-12-04 飞利浦建兴数位科技股份有限公司 Control method for spindle motor
JP6293358B2 (en) * 2015-02-25 2018-03-14 三菱電機株式会社 Disk unit

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Also Published As

Publication number Publication date
KR20080070075A (en) 2008-07-29
CN101313361B (en) 2010-12-01
ATE441924T1 (en) 2009-09-15
EP1955326B1 (en) 2009-09-02
JP5236480B2 (en) 2013-07-17
TW200739520A (en) 2007-10-16
JP2009527065A (en) 2009-07-23
DE602006008978D1 (en) 2009-10-15
EP1955326A1 (en) 2008-08-13
CN101313361A (en) 2008-11-26
US20080288970A1 (en) 2008-11-20
MY147823A (en) 2013-01-31
US9245576B2 (en) 2016-01-26

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