WO1991018392A1 - Process for shortening the switching on time of an optical recording and/or playback machine - Google Patents

Process for shortening the switching on time of an optical recording and/or playback machine Download PDF

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Publication number
WO1991018392A1
WO1991018392A1 PCT/EP1991/000893 EP9100893W WO9118392A1 WO 1991018392 A1 WO1991018392 A1 WO 1991018392A1 EP 9100893 W EP9100893 W EP 9100893W WO 9118392 A1 WO9118392 A1 WO 9118392A1
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WO
WIPO (PCT)
Prior art keywords
disk
speed
scanning device
focus
light beam
Prior art date
Application number
PCT/EP1991/000893
Other languages
German (de)
French (fr)
Inventor
Dieter Baas
Original Assignee
Deutsche Thomson-Brandt Gmbh
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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Priority to JP91508941A priority Critical patent/JPH05506532A/en
Publication of WO1991018392A1 publication Critical patent/WO1991018392A1/en

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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
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/24—Arrangements for providing constant relative speed between record carrier and head
    • G11B19/247—Arrangements for providing constant relative speed between record carrier and head using electrical means
    • 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
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/24—Arrangements for providing constant relative speed between record carrier and head

Definitions

  • the invention relates to a method for shortening the on-time of an optical recording and / or reproducing device, in which a light beam is focused on a rotating disk in order to read the data on the disk.
  • Such a playback device is, for example, a CD player whose optical scanning device focuses a light beam onto the rotating recording medium, the compact disc, in order to be able to scan the data recorded on spiral data tracks.
  • a CD player is a so-called CLV system, the abbreviation for constant linear velocity, in which the data is read at a constant web speed.
  • the speed of the disk is therefore based on a synchronizing signal contained in the data signal on the data track being scanned regulated speed. If the data tracks of the disk are read from the inside out, the speed of the disk is reduced as the scanner moves from the center of the disk to the edge of the disk.
  • the speed of the plate can only be regulated to the target speed when the data signal is available, the light beam must first be focused on the plate. Only after focusing is the optical scanning device delivering the data signal and the synchronizing signal, which is now used to regulate the speed of the disk. Before you can start reading the data - with a CD player playing the disc - the light beam must first be focused on the disc and then the speed of the disc must be adjusted to the target speed.
  • the invention achieves this object in that when the device is switched on, the current position of the optical scanning device is detected, the speed of the disk is regulated to the speed corresponding to the current position of the optical scanning device, during which the light beam is focused on the disk, and that as soon as the light beam is focused on the plate, the speed of the plate is regulated by means of a synchronous signal read from the plate.
  • the invention is based on the knowledge that in a CLV system a specific speed of the disk is prescribed for each position of the optical scanning device. If the position of the scanning device is determined when the CD player is switched on, for example by means of a position detector, the speed of the disk can be regulated immediately to the value corresponding to the current position of the scanning device without having to wait for focusing. While the speed of the plate is now increased from the Mull value to the target speed, the light beam is focused on the plate at the same time.
  • a synchronous signal recorded on the disk is used to regulate the disk speed.
  • a first embodiment of the invention provides that if the focus is lost during game operation, e.g. as a result of a shock, the speed set at the moment the focus is lost is maintained until the focus is found again. This measure has the advantage that after finding the focus again, the difference between the retained speed and the new target speed is almost zero.
  • the instantaneous position of the scanner is maintained if the focus is lost.
  • the speed of the disk set at the moment of a loss of focus and the position of the scanning device can be stored in order to determine how find the focus from the stored values to continue playing the data.
  • All described embodiments of the invention have the advantage that if the focus is lost and the focus is found again during game operation, the speed of the disk is regulated to the target speed in the shortest possible time.
  • the invention is suitable for optical recording and / or reproducing devices in which a light beam is focused on the recording medium, a rotating plate, in order to scan the data of the recording medium as is usual in a CLV system with constant web speed.
  • Examples include CD players, video record players, DRAW disc players and magneto-optical devices.

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

When a CD-player is switched on, the light beam of an optical scanning device is at first focussed on the CD, before the speed of rotation of the disk is set at the set speed of rotation by means of a synchronizing signal recorded on the disk. In order to shorten the interval between switching on and sound playback, when the machine is switched on, the momentary position of the optical scanning device is immediately sensed and the speed of rotation of the disk is set at the value corresponding to that position, while the light beam is at the same time focussed on the disk. When the light beam is focussed, a synchronizing signal recorded on the disk serves to regulate the speed of rotation. Since focussing and acceleration of the speed of rotation from zero to the set speed of rotation no longer follow each other, but happen simultaneously, the annoying waiting time between switching on and sound playback is essentially shortened.

Description

------------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ---------------------------
Verfahren zur Verkürzung der Einschaltzeit eines optischen Method of shortening the turn-on time of an optical
Aufzeichnungs- und/oder Wiedergabegerätes. ----------------------------------------------------------------------------------------------------------------------------------  Recording and / or playback device. -------------------------------------------------- -------------------------------------------------- ------------------------------
Die Erfindung betrifft ein Verfahren zur Verkürzung der Einschaltzeit eines optischen Aufzeichnungs- und/oder Wiedergabegerätes, bei dem ein Lichtstrahl auf eine rotierende Platte fokussiert wird, um die Daten der Platte zu lesen. The invention relates to a method for shortening the on-time of an optical recording and / or reproducing device, in which a light beam is focused on a rotating disk in order to read the data on the disk.
Ein derartiges Wiedergabegerät ist z.B. ein CD-Spieler, dessen optische Abtastvorrichtung einen Lichtstrahl auf den rotierenden Aufzeichnungsträger, die Compact-Disc, fokussiert, um die auf spiralförmigen Datenspuren aufgezeichneten Daten abtasten zu können. Ein CD-Spieler ist ein sogenanntes CLV-System, die Abkürzung für Constant-Linear-Velocity, bei dem die Daten mit konstanter Bahngeschwindigkeit gelesen werden. Die Drehzahl der Platte wird daher mittels eines im Datensignal enthaltenen Synchronsignals auf die für die jeweils abgetastete Datenspur rieh tige Drehzahl geregelt. Wenn die Datenspuren der Platte von innen nach außen gelesen werden, so wird die Drehzahl der Platte erniedrigt, während sich die Abtastvorrichtung von der Plattenmitte zum Plattenrand hin bewegt. Such a playback device is, for example, a CD player whose optical scanning device focuses a light beam onto the rotating recording medium, the compact disc, in order to be able to scan the data recorded on spiral data tracks. A CD player is a so-called CLV system, the abbreviation for constant linear velocity, in which the data is read at a constant web speed. The speed of the disk is therefore based on a synchronizing signal contained in the data signal on the data track being scanned regulated speed. If the data tracks of the disk are read from the inside out, the speed of the disk is reduced as the scanner moves from the center of the disk to the edge of the disk.
Weil aber die Drehzahl der Platte erst dann auf die Solldrehzahl geregelt werden kann, wenn das Datensignal zur Verfügung steht, muß zuerst der Lichtstrahl auf die Platte fokussiert werden. Erst nachdem fokussiert ist, liefert die optische Abtastvorrichtung das Datensignal und das Synchronsignal, das nun der Regelung der Drehzahl der Platte dient. Bevor mit dem Lesen der Daten - bei einem CD-Spieler mit dem Abspielen der Platte - begonnen werden kann, muß deshalb zuerst der Lichtstrahl auf die Platte fokussiert und anschließend die Drehzahl der Platte auf die Solldrehzahl geregelt werden. However, because the speed of the plate can only be regulated to the target speed when the data signal is available, the light beam must first be focused on the plate. Only after focusing is the optical scanning device delivering the data signal and the synchronizing signal, which is now used to regulate the speed of the disk. Before you can start reading the data - with a CD player playing the disc - the light beam must first be focused on the disc and then the speed of the disc must be adjusted to the target speed.
Weil diese beiden Schritte, Fokussierung und Regelung auf die Solldrehzahl, jedoch relativ viel Zeit in Anspruch nehmen, muß der Bediener vom Einschalten des CD-Spielers an gerechnet einige Zeit warten, bis er seine Platte hören kann. However, because these two steps, focusing and regulating to the desired speed, take a relatively long time, the operator has to wait a while from the time the CD player is switched on before he can hear his disk.
Es ist daher Aufgabe der Erfindung, die Einschaltzeit bei einem optischen Aufzeichnungs- und/oder Wiedergabegerät zu verkürzen, das die Daten mit konstanter Bahngeschwindigkeit liest. It is therefore an object of the invention to shorten the switch-on time in an optical recording and / or reproducing device which reads the data at a constant web speed.
Die Erfindung löst diese Aufgabe dadurch, daß bei Einschalten des Gerätes die augenblickliche Position der optischen Abtastvorrichtung erfaßt wird, daß die Drehzahl der Platte auf die Drehzahl geregelt wird, die der augenblicklichen Position der optischen Abtastvorrichung entspricht, währenddessen der Lichtstrahl auf die Platte fokussiert wird, und daß, sobald der Lichtstrahl auf die Platte fokussiert ist., die Drehzahl der Platte mittels eines von der Platte gelesenen Synchronsignals geregelt wird. Die Erfindung geht von der Erkenntnis aus, daß bei einem CLV-System für jede Position der optischen Abtastvorrichtung eine bestimme Drehzahl der Platte vorgeschrieben ist. Wenn die Position der Abtastvorrichtung beim Einschalten des CD-Spielers z.B. mittels eines Positionsdetektors festgestellt wird, so kann die Drehzahl der Platte sofort, ohne die Fokussierung abwarten zu müssen, auf den der augenblicklichen Position der Abtastvorrichtung entsprechenden Wert geregelt werden. Während nun die Drehzahl der Platte vom Wert Mull auf die Solldrehzahl erhöht wird, wird gleichzeitig der Lichtstrahl auf die Platte fokussiert. The invention achieves this object in that when the device is switched on, the current position of the optical scanning device is detected, the speed of the disk is regulated to the speed corresponding to the current position of the optical scanning device, during which the light beam is focused on the disk, and that as soon as the light beam is focused on the plate, the speed of the plate is regulated by means of a synchronous signal read from the plate. The invention is based on the knowledge that in a CLV system a specific speed of the disk is prescribed for each position of the optical scanning device. If the position of the scanning device is determined when the CD player is switched on, for example by means of a position detector, the speed of the disk can be regulated immediately to the value corresponding to the current position of the scanning device without having to wait for focusing. While the speed of the plate is now increased from the Mull value to the target speed, the light beam is focused on the plate at the same time.
Nachdem der Fokus gefunden ist und Daten von der Platte gelesen werden, dient ein auf der Platte aufgezeichnetes Synchronsignal der Regelung der Plattendrehzahl. After the focus is found and data is read from the disk, a synchronous signal recorded on the disk is used to regulate the disk speed.
Weil im Gegensatz zum Stand der Technik bei der Erfindung die Fokussierung und die Erhöhung der Plattendrehzahl von null auf die Solldrehzahl nicht nacheinander, sondern gleichzeitig ablaufen, wird die Einschaltzeit beträchtlich verkürzt. In contrast to the prior art in the invention, the focusing and the increase in the plate speed from zero to the target speed do not take place successively but simultaneously, the switch-on time is considerably reduced.
Eine erste Ausgestaltung der Erfindung sieht vor, daß bei Verlust des Fokus während des Spielbetriebs z.B. infolge eines Stoßes die im Augenblick des Fokusverlustes eingestellte Drehzahl beibehalten wird, bis der Fokus wieder gefunden wird. Diese Maßnahme hat den Vorteil, daß nach dem Wiederauffinden des Fokus der Unterschied zwischen der beibehaltenen Drehzahl und d e r neuen Solldrehzahl nahezu null ist. A first embodiment of the invention provides that if the focus is lost during game operation, e.g. as a result of a shock, the speed set at the moment the focus is lost is maintained until the focus is found again. This measure has the advantage that after finding the focus again, the difference between the retained speed and the new target speed is almost zero.
Bei einem zweiten Ausführungsbeispiel wird neben der Drehzahl der Platte auch die augenblickliche Position der Abtastvorrichtung beibehalten, wenn der Fokus verloren geht. In a second embodiment, in addition to the speed of the disk, the instantaneous position of the scanner is maintained if the focus is lost.
Bei einem dritten Ausführungsbeispiel können die im Augenblick eines Fokusverlustes eingestellte Drehzahl der Platte sowie die Position der Abtastvorrichtung gespeichert werden, um bei Wie derfinden des Fokus von den gespeicherten Werten ausgehend die Wiedergabe der Daten fortzusetzen. In a third embodiment, the speed of the disk set at the moment of a loss of focus and the position of the scanning device can be stored in order to determine how find the focus from the stored values to continue playing the data.
Bei Geräten, deren Spurregelkreis aus einem Grob- und einem Feinantrieb aufgebaut ist, wird bei Verlust des Fokus die augenblickliche Position des Grobantriebs beibehalten. In devices whose track control loop is made up of a coarse and a fine drive, the current position of the coarse drive is maintained if the focus is lost.
Alle beschriebenen Ausgestaltungen der Erfindung haben den Vorteil, daß bei Verlust und Wiederfinden des Fokus während des Spielbetriebs die Drehzahl der Platte in möglichst kurzer Zeit auf die Solldrehzahl geregelt wird. All described embodiments of the invention have the advantage that if the focus is lost and the focus is found again during game operation, the speed of the disk is regulated to the target speed in the shortest possible time.
Die Erfindung ist für optische Aufzeichnungs- und/oder Wiedergabegeräte geeignet, bei denen ein Lichtstrahl auf den Aufzeichnungsträger, eine rotierende Platte, fokussiert wird, um die Daten des Aufzei chnungst rägers wie bei einem CLV-System üblich mit konstanter Bahngeschwindugkeit abzutasten. Als Beispiele seien CD-Spieler, Videoplattenspieler, DRAW-Disc-Spieler und magneto-optisehe Geräte genannt. The invention is suitable for optical recording and / or reproducing devices in which a light beam is focused on the recording medium, a rotating plate, in order to scan the data of the recording medium as is usual in a CLV system with constant web speed. Examples include CD players, video record players, DRAW disc players and magneto-optical devices.

Claims

Patentansprüche Claims
1. Verfahren zur Verkürzung der Einschaltzeit eines. optischen Aufzeichnungs- und/oder Wiedergabegerätes, bei dem ein Lichtstrahl einer optischen Abtastvorrichtung auf eine rotierende Platte fokussiert wird, um die auf der Platte aufgezeichneten Daten zu lesen, d a d u r c h g e k e n n z e i c h n e t, daß bei Einschalten des Gerätes die augenblickliche Position der Abtastvorrichtung bezüglich der Platte erfaßt wird, daß die Drehzahl der Platte auf den Wert geregelt wird, welcher der augenblicklichen Position der Abtastvorrichtung entspricht, währenddessen der Lichtstrahl auf die Platte fokussiert wird, und daß, sobald der Lichtstrahl auf die Platte fokussiert ist, ein auf der Platte aufgezeichnetes Synchronsignal zur Regelung der Drehzahl dient. 1. Procedure for shortening the on-time of a. optical recording and / or reproducing apparatus in which a light beam from an optical scanning device is focused on a rotating disk in order to read the data recorded on the disk, characterized in that, when the device is switched on, the instantaneous position of the scanning device with respect to the disk is detected, that the speed of rotation of the disk is controlled to the value corresponding to the current position of the scanning device, during which the light beam is focused on the disk, and that as soon as the light beam is focused on the disk, a synchronization signal recorded on the disk to control the speed serves.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß bei Verlust des Fokus während des Betriebs die im Augenblick des Fokusverlustes eingestellte Drehzahl bis zum Wiederfinden des Fokus beibehalten wird. 2. The method according to claim 1, d a d u r c h g e k e n n z e i c h n e t that if the focus is lost during operation, the speed set at the moment the focus is lost is maintained until the focus is found again.
3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, daß die augenblickliche Position der Abtastvorrichtung bei Fokusverlust beibehalten wird. 3. The method of claim 2, d a d u r c h g e k e n n z e i c h n e t that the current position of the scanning device is maintained in the event of loss of focus.
4. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß während des Betriebs bei Fokusverlust die augenblickliche Drehzahl der Platte und die Position der Abtastvorrichtung gespeichert werden, um bei Wiederfinden des Fokus das Abtasten der Daten mit der gespeicherten Drehzahl der Platte und der gespeicherten Position der Abtastvorrichtung fortzusetzen. 4. The method according to claim 1, characterized in that the current speed of the disk and the position of the scanning device are stored during operation in the event of loss of focus in order to continue scanning the data with the stored speed of the disk and the stored position of the scanning device when the focus is found again .
PCT/EP1991/000893 1990-05-23 1991-05-14 Process for shortening the switching on time of an optical recording and/or playback machine WO1991018392A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP91508941A JPH05506532A (en) 1990-05-23 1991-05-14 How to reduce input time for optical recording and/or playback equipment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4016552.3 1990-05-23
DE19904016552 DE4016552A1 (en) 1990-05-23 1990-05-23 METHOD FOR SHORTING THE ON TIME OF AN OPTICAL RECORDING AND / OR PLAYBACK DEVICE

Publications (1)

Publication Number Publication Date
WO1991018392A1 true WO1991018392A1 (en) 1991-11-28

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PCT/EP1991/000893 WO1991018392A1 (en) 1990-05-23 1991-05-14 Process for shortening the switching on time of an optical recording and/or playback machine

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EP (1) EP0530234A1 (en)
JP (1) JPH05506532A (en)
DE (1) DE4016552A1 (en)
HU (1) HUT64429A (en)
WO (1) WO1991018392A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011494A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for controllably rotating an information storage disc
EP0139332A2 (en) * 1983-10-17 1985-05-02 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from a disc-shaped optically readable record carrier
JPS6124055A (en) * 1984-07-13 1986-02-01 Matsushita Electric Ind Co Ltd Rotation controller of disc reproducing device
US4815063A (en) * 1985-09-13 1989-03-21 Yamaha Corporation Disc motor control circuit for controlling the rotation of a disc in a disc playing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011494A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for controllably rotating an information storage disc
EP0139332A2 (en) * 1983-10-17 1985-05-02 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from a disc-shaped optically readable record carrier
JPS6124055A (en) * 1984-07-13 1986-02-01 Matsushita Electric Ind Co Ltd Rotation controller of disc reproducing device
US4815063A (en) * 1985-09-13 1989-03-21 Yamaha Corporation Disc motor control circuit for controlling the rotation of a disc in a disc playing device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 177 (P-470)(2233) 21 Juni 1986, & JP-A-61 024055 (MATSUSHITA ELECTRIC IND. CO. LTD.) 01 Februar 1986, siehe das ganze Dokument *

Also Published As

Publication number Publication date
EP0530234A1 (en) 1993-03-10
DE4016552A1 (en) 1991-11-28
JPH05506532A (en) 1993-09-22
HU9203296D0 (en) 1993-03-01
HUT64429A (en) 1993-12-28

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