Devices and methods for determining a critical rotation speed of an optical data carrier, monitoring a condition of an optical data carrier, and generating a reference signal
A technology of optical data and rotation speed, which is applied in the direction of optical recording/reproduction, data recording, information storage, etc., and can solve the problems of damaged drive and high speed
Inactive Publication Date: 2011-07-27
KONINK PHILIPS ELECTRONICS NV
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Problems solved by technology
The danger with this method is that the speed may be too high and may damage the drive and / or disk
Method used
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[0063] figure 1 The deflection of the optical data carrier 1 is shown schematically. The optical data carrier 1 may deform or deflect and exhibit a standing wave waveform. This standing wave waveform is indicated by dashed line 3 . Said deflection is indicated by arrow 5 . The standing wave waveform shown has a number of nodes 7, which are regions of the optical data carrier 1 where the undeformed data carrier surface coincides with the deflected surface (except for differences in the inclination of the surfaces).
[0064] figure 2 A first embodiment of a device 9 for determining a critical rotational speed of an optical data carrier 1 according to the invention is shown schematically. Said device 9 comprises a driver unit 11 with a spindle 13 , a measurement unit 15 , a storage unit 23 and a determination unit 21 connected to said driver unit 11 , measurement unit 15 and storage unit 23 . The drive unit 11 rotates the optical data carrier 1 via the spindle 13 and transm...
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The invention relates to a device (9, 109) and a method (501) for determining a critical rotation speed of an optical data carrier (1) at which a critical deflection of said optical data carrier (1) may occur in said device (9, 109), an apparatus (209) and a method for monitoring a condition of an optical data carrier (1), an apparatus (309) and a method for reading data from and / or writing data to an optical data carrier (1), and a device (409) and a method for generating a reference signal to be used for determining a critical rotation speed of an optical data carrier (9). In order to provide a device (9, 109) for determining a critical rotation speed which allows a rotation of the data carrier (1) at a high, yet safe rotation speed without endangering the device (9, 109) and / or the data carrier (1), a device (9, 109) for determining a critical rotation speed of an optical data carrier (1) is proposed, said device (9, 109) comprising a drive unit (11) for rotating said optical data carrier (1), said drive unit (11) being adapted for rotating said optical data carrier (1) according to a sweep covering a predetermined range of rotation speeds, a measurement unit (15, 115) for generating a measurement signal indicative of a distance between a surface (17) of said optical data carrier (1) and a reference position (19) corresponding to said sweep, and a determination unit (21) for determining said critical rotation speed of said optical data carrier (1) by processing said measurement signal on the basis of at least one characteristic of said measurement signal.
Description
technical field [0001] The invention relates to a device and a method for determining a critical rotational speed of an optical data carrier at which critical deflection of the optical data carrier can occur within the device, a Apparatus and method for monitoring the condition of an optical data carrier, an apparatus and method for reading data from and / or writing data to an optical data carrier and a method for generating data to be used to determine optical Device and method for a reference signal of a critical rotational speed of a data carrier. The invention also relates to a corresponding computer program. Background technique [0002] The data throughput of a read or write operation in an optical disc drive is determined by the data density recorded on the optical disc or optical data carrier and the rotational speed of the optical data carrier during operation. For a given data density on the data carrier, the throughput can be increased by increasing the speed or ...
Claims
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IPC IPC(8): G11B19/28G11B7/095
CPCG11B19/26G11B19/20G11B19/28G11B20/10
Inventor P·M·R·沃尔特尔贝尔
Owner KONINK PHILIPS ELECTRONICS NV