JP2005222596A - Optical disk recording or reproducing apparatus and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording or reproducing apparatus which performs more stable recording or reproducing by detecting current ambient temperature of usage environment with absolute temperature and performing control proper to the ambient temperature on the basis of the absolute temperature, and also to provide its control method. <P>SOLUTION: The optical disk recording or reproducing apparatus is equipped with; a temperature detection means 32 to detect ambient temperature information of an optical disk 20; a storage device 42 which saves detected values of the temperature detection means 32 measured in two states of absolute temperature defined beforehand, respectively together with the above absolute temperatures; an information processing module 41 which forms a correlation function to find the absolute temperatures from detected values detected by the temperature detection means 32 from two sets of information of the absolute temperatures and the detected values stored in the storage device 42, and converts the detected values of the temperature detection means 32 to the absolute temperatures by the correlation function at the time of actual use; and a system controller 40 which switches control parameters of the recording or reproducing apparatus based on the absolute temperature found by the information processing module 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc recording / reproducing apparatus and a control method therefor, and more particularly to a technique for avoiding performance degradation due to a temperature difference in a use environment.

  For the past several years, optical discs have become widespread as recording and reproducing devices such as computers. Advantages of this optical disk include a simple apparatus configuration and an optical disk medium that is inexpensive and has a large capacity. Furthermore, with recent technological improvements, examples of mounting on portable devices such as notebook computers and digital cameras are increasing.

  By the way, while it is assumed that desktop personal computers (PCs) are used in general buildings, portable devices such as notebook computers and digital cameras are used in various environments. The Accordingly, it has become necessary for computer-related devices to perform a stable recording / reproducing operation even when the surrounding environment (for example, temperature and humidity) greatly deviates from the room.

  As described above, the optical disk recording / reproducing apparatus may be used under various conditions such as normal temperature, high temperature, and low temperature, but the read / write processing (sequence and parameter setting) is the same regardless of the use environment. Often used. In other words, it can be said that “the settings that are valid in all environments (general / safe) are selected and used”.

  Due to changes in the surrounding environment (for example, temperature and humidity), for example, there is warping of the optical disc as a matter of concern at high temperatures, but for discs with poor recording characteristics at room temperature, recording with warping of the disc when writing at high temperatures In some cases, the characteristics deteriorate and cannot be reproduced during reproduction (at room temperature). Also, regarding reading, there are cases where the mechanical load increases at low temperatures and cannot move, or at high temperatures it cannot be read due to characteristic deterioration of the pickup or the like (parameter setting inappropriate).

Therefore, a method for switching various control contents based on the temperature detected by the temperature detecting means provided with a temperature sensor (temperature detecting means) for detecting the temperature inside the apparatus and the temperature around the optical disk inside the optical disk recording / reproducing apparatus. Has been adopted. For example, the internal temperature of the disk device is measured by the temperature detecting means, the measured internal temperature is compared with a preset threshold value, and the recording double speed on the disk is changed (Patent Document 1), or the temperature detecting means An ambient temperature of the optical disk is measured, and an optimum recording power is set according to the measured ambient temperature and the linear velocity of the optical disk (Patent Document 2).
JP 2003-173536 A JP 2002-329319 A

  However, the temperature detecting means normally incorporated in the conventional optical disc recording / reproducing apparatus shows the ambient temperature information as a relative value. In other words, information indicating how much is different from the reference value can be detected correctly, but information as absolute temperature cannot be obtained. Therefore, in the control switching process of the apparatus based on the absolute temperature, optimal control switching is performed. There was a problem that I could not. Further, the control switching based on the relative value has a problem that it is not possible to obtain a result that can absorb the variation in the temperature detection means itself and the difference in internal temperature for each apparatus.

  Therefore, the present invention detects the ambient temperature being used as an absolute temperature, and performs control according to the ambient temperature based on the absolute temperature, thereby maintaining the quality of recording / reproduction and more stable recording / reproduction. It is an object of the present invention to provide an optical disc recording / reproducing apparatus and a control method capable of performing the above.

  In order to achieve the above-described object, an optical disc recording / reproducing apparatus of the present invention is an optical disc recording / reproducing apparatus for recording data on an optical disc and reproducing the data from the optical disc. The temperature information detecting means for detecting the temperature information, and the detected values measured by the temperature information detecting means in a state where the absolute temperature around the temperature information detecting means is set to two or more predetermined reference temperatures. And a reference temperature information storage means to be stored together with two or more sets of reference temperatures and detection values stored in the reference temperature information storage means to detect the temperature information detection value of the temperature information detection means. Temperature information correction means for correcting the absolute temperature around the means, and the recording / reproduction based on the absolute temperature obtained by the temperature information correction means Characterized by comprising a switching means for switching the control of the location.

  According to the above configuration, the temperature detection means detects the temperature information around the optical disk or the optical disk, and the temperature information is corrected / converted to the absolute temperature by the internal temperature information correction means, and the ambient temperature is set based on the absolute temperature. In addition, by switching the control of the apparatus, the quality of recording and reproduction is maintained, and more stable operation can be obtained.

  Further, the temperature information correction unit is configured to calculate a detection value of the temperature information detection unit from a set of two or more reference temperatures and detection values stored in the reference temperature information storage unit and to obtain an absolute value around the temperature information detection unit. A rule for correcting the temperature is obtained by approximating it with a first-order function or more, and the detected value of the temperature information detecting means is corrected to an absolute temperature according to this rule.

  The control method of the optical disc recording / reproducing apparatus of the present invention is a control method of an optical disc recording / reproducing device for recording data on an optical disc and reproducing the data from the optical disc, wherein the absolute temperature around the optical disc or the optical disc is determined in advance. In the state where two or more reference temperatures are set, temperature information around the optical disk or the optical disk is detected, and a correlation function between the detected temperature information and the absolute temperature is calculated based on the reference temperature and the detected temperature information. When the temperature information about the optical disk or the optical disk is detected during actual use, the detected temperature information is converted into an absolute temperature by the correlation function, and the control of the recording / reproducing apparatus is switched based on the absolute temperature. It is characterized by that.

  According to the above method, in the state where the absolute temperature around the optical disk or the optical disk is set to two or more predetermined reference temperatures, the temperature information around the optical disk or the optical disk is detected by the temperature detecting means, and the temperature information and the absolute temperature are detected. In the actual use, the temperature information is converted into an absolute temperature by using this correlation function, and the control of the device is switched according to the absolute temperature, so that the quality of recording / reproduction is maintained. Stable operation can be obtained.

The correlation function between the absolute temperature and the detected temperature information is obtained by approximating with a first-order function or more.
Further, in the optical disk recording / reproducing apparatus and the control method thereof according to the present invention, according to the absolute temperature obtained from the temperature information around the optical disk or the optical disk,
1. changing the upper limit of the recording speed of the recording speed switching means for switching the recording speed during optical disc recording;
2. Switching the recording strategy information at the time of optical disc recording to the strategy stored in the strategy information storage means,
3. Changing the upper limit value of the playback speed of the playback speed switching means for switching the playback speed during optical disc playback;
4. Changing the laser power by means of laser power switching means for switching the laser power during optical disc playback,
5. changing the offset value of the focus offset switching means for switching the focus servo control offset value at the time of optical disc recording / playback;
6. Extracting the reproduction clock from the reproduction signal of the optical disk and changing the PLL control characteristic of the PLL means for reproducing the data in synchronization with the reproduction clock;
7. changing the data slice characteristic of the means for controlling the data slice characteristic for binarizing the reproduction signal of the optical disc;
8. Changing the degree of acceleration and deceleration during the seek operation of the profile means that determines the degree of acceleration and deceleration during the optical disc seek operation and the maximum speed;
9. Changing the traverse drive capability of the traverse drive capability switching means for controlling the traverse drive capability for moving the pickup for recording and reproducing information with respect to the optical disc;
It is characterized by.

  The optical disk recording / reproducing apparatus and control method thereof according to the present invention absorbs errors due to variations in temperature detection means (parts) by the above-described configuration and method, and are more accurate based on the absolute temperature when the actual apparatus is used. A more appropriate parameter can be set, so that the recording / reproduction quality can be maintained, and more stable recording / reproduction can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.
In FIG. 1, 10 is an optical disk recording / reproducing apparatus, 20 is an optical disk as a recording / reproducing medium, and a spindle motor 39 for rotating the optical disk 20 and a spindle motor control means 37 for controlling the rotation speed of the spindle motor 39 are provided. It has been. The spindle motor control means 37 is provided with a recording speed switching means 51 for switching the recording speed when data is recorded on the optical disk 20 and a reproduction speed switching means 52 for switching the reproduction speed when reproducing data from the optical disk 20. Yes.

  Further, the laser beam is emitted and condensed by an objective lens (not shown), thereby forming a laser spot on the optical disc 20, and recording of information by the laser spot, or reproduction or erasure of recorded information. A pickup 30 is provided. The pickup 30 constitutes a recording means for recording information on the optical disc 20 and a reproducing means for reproducing information recorded on the optical disc 20.

  A detection signal, which is irradiated with a light beam on the optical disk 20, detects the reflected light and is converted into an electric signal, is input from the pickup 30 to the signal processing means 36. The signal processing means 36 is provided with a signal processing circuit that forms and outputs a tracking error signal and a focus error signal based on the input detection signal, outputs a reproduction signal by performing error correction of information, and the like. A laser driving circuit is provided for driving the optical disc 20 to irradiate the optical disc 20 with a light beam for recording and reproducing data on the optical disc 20. The signal processing unit 36 includes a laser power switching unit 61 for switching the laser power during optical disc reproduction, a strategy information storage unit 62 for storing optimum recording strategy information for each ambient temperature during recording, and a reproduction clock from the reproduction signal. PLL means 63 for reproducing data in synchronization with the reproduction clock, PLL control switching means 64 for switching the operating frequency characteristic of the PLL means 63, and means for controlling the data slice characteristic for binarizing the reproduction signal 65 and data slice characteristic switching means 66 for switching the data slice characteristics are provided.

  Although not shown, a traverse feed motor that moves the position of the pickup 30 in the radial direction of the disk 20, a tracking coil (track actuator) that adjusts the laser spot, and a focus coil (focus actuator) are provided. Traverse feed control (position control) for driving the feed motor to move the position of the pickup 30 in the radial direction of the disk 20, tracking control for controlling the tracking coil based on the tracking error signal, focus based on the focus error signal Pickup control means 35 for performing focus control for controlling the coil is provided. The pickup control means 35 includes a focus offset switching means 71 for switching a focus servo control offset value at the time of optical disc recording / reproduction, a traverse driving ability switching means 72 for controlling the driving ability of a traverse for moving the pickup 30, and a seek operation. Profile means 73 for determining the degree of acceleration / deceleration and the maximum speed and profile switching means 74 for switching the profile means 73 are provided.

  Further, temperature (information) detecting means 32 for detecting the ambient temperature of the optical disc 20 is provided. As the temperature detecting means 32, a thermistor mounted on the pickup 30 is used in order to prevent the pickup 30 from being destroyed due to a temperature rise during recording. This thermistor detects the ambient temperature with a voltage. In the present embodiment, the temperature detection means 32 detects the ambient temperature of the optical disc 20, but the temperature of the optical disc 20 can also be measured.

  Further, the temperature detection means 32, the pickup control means 35, the signal processing means 36 and the spindle motor control means 37 are connected to the pickup control means 35, the signal processing means 36 and the spindle motor control means 37, for example. A rotation speed control signal is output to the spindle motor control means 37 to control the rotation speed of the spindle motor 39, and a position control signal is output to the pickup control means 35 to change the position of the laser spot formed on the optical disc 20. There is provided a system controller 40 that performs such operations.

  Further, a storage device 42 connected to the system controller 40 and an interface 44 for external devices are provided. Reference temperature information for storing the detected values respectively measured by the temperature detection means 32 together with the reference temperature in a state where the storage device 42 sets the absolute temperature around the temperature detection means 32 to two or more reference temperatures set in advance. The storage unit 81 is configured. The system controller 40 includes an information processing module 41. The information processing module 41 is a combination of two or more reference temperatures and detection values stored in the storage device 42 (reference temperature information storage unit 81). Based on this information, a correlation f (x) (an example of a rule) for correcting the detected value of the temperature detecting means 32 to the absolute temperature around the temperature detecting means 32 is obtained by approximating with a first-order function or higher. The temperature information correcting unit 82 is configured to correct the detection value of the temperature detecting unit 32 to the absolute temperature according to the correlation f (x). Further, the system controller 40 constitutes switching means for switching control of the recording / reproducing apparatus 10 based on the absolute temperature obtained by the information processing module 41 (temperature information correction means 82).

The optical disc recording / reproducing apparatus 10 includes the pickup 30, temperature detection means 32, pickup control means 35, signal processing means 36, spindle control means 37, spindle motor 39, system controller 40, storage device 42, and interface 44. Is done.
[Procedure for Obtaining Correlation between Detected Value of Temperature Information Detection Unit 32 and Absolute Temperature]
The procedure for obtaining the correlation between the detection value of the temperature information detection means 32 and the absolute temperature around the temperature detection means 32 will be described with reference to the flowchart of FIG.

  FIG. 2 shows a flow until the detection value of the temperature information detection means 32 measured in a predetermined ambient temperature state is stored in the storage device 42, the detection value (temperature information) of the temperature information detection means 32, and the absolute temperature. The sequence flow until the correlation f (x) is derived is shown.

  First, the recording / reproducing apparatus 10 is arranged in a state where the ambient temperature of the temperature detecting means 32 is set to a predetermined reference temperature (absolute temperature) (A), and in this state, the host system ( A command for obtaining ambient temperature information is issued from the optical disc recording / reproducing device 10 (not shown, for example, an inspection device) (step S1).

  Upon receipt of the command, the system controller 40 acquires ambient temperature information by the temperature detecting means 32 (step -S2), and a predetermined reference temperature (absolute temperature) (A) and detected temperature information (A ') Is stored in the storage device 42 (step S3).

  When a command for obtaining ambient temperature information is issued from the host system in the inspection at the reference temperature of 20 ° C. (A), for example, by the steps −S 1 to S 3, the ambient temperature (A ′) is detected by the temperature detection means 32. Is detected, and the system controller 40 stores the reference temperature of 20 ° C. (A) and the ambient temperature (A ′) detected by the temperature detection means 32 in the storage device 42.

  Further, the optical disk recording / reproducing is performed in a state in which the ambient temperature of the temperature detecting means 32 is set to another predetermined reference temperature (absolute temperature) (B) different from the predetermined reference temperature (A). In the state where the apparatus 10 is arranged, a command for acquiring ambient temperature information is issued from the host system (not shown) to the optical disc recording / reproducing apparatus 10 via the interface 44 (step S4).

  When the system controller 40 receives the command, it acquires the ambient temperature information by the temperature detection means 32 (step -S5), and the predetermined reference temperature (absolute temperature) (B) and the detected ambient temperature (B '). Are stored in the storage device 42 (step S6).

  When a command for obtaining ambient temperature information is issued from the host system in the inspection at the ambient temperature 45 ° C. (B), for example, by the steps −S4 to S6, the ambient temperature (B ′) is obtained by the temperature detection means 32. Is detected, and the system controller 40 stores the reference temperature of 45 ° C. (B) and the ambient temperature (B ′) detected by the temperature detection means 32 in the storage device 42.

  Subsequently, based on the two sets of “reference temperature and detected ambient temperature” stored in the storage device 42 in step S3 and step S6, the system controller 40 uses the internal information processing module 41 (temperature information correction means). 82) is used to derive the correlation f (x) (an example of a rule) between the temperature information (detected value) x obtained from the temperature detecting means 32 and the absolute temperature y (step S7) and stored in the storage device 42. (Step-S8).

FIG. 3 shows the correlation f (x) between the temperature information (detected value) x obtained by the temperature detecting means 32 and the absolute temperature y. The absolute temperature y is obtained by the following equation (1).
y = {(B−A) ÷ (B′−A ′)} × x + A ′ (1)
The thermistor mounted on the pickup 30 is used as the temperature detecting means 32 mounted on the optical disc recording / reproducing apparatus 10, and this thermistor detects the ambient temperature with a voltage, and the temperature is detected in the system controller 40. Although converted into information (detected value), the value detected by the thermistor differs depending on the individual difference of the thermistor. Therefore, the detected value obtained by the thermistor alone is a difference relative to the difference between the two temperatures. That is, it is not possible to obtain a relative difference of “how different”. In addition, when there is only one reference temperature stored in advance, ambient temperature information (absolute temperature) is often not obtained accurately. However, the temperature information (obtained from the temperature detection means 32) can be obtained by confirming at least two or more relationships between the predetermined reference temperature (absolute temperature) and the temperature information (detection value) obtained by the temperature detection device 32. It is possible to derive a correlation f (x) between the detected value) x and the ambient absolute temperature y.

Here, the correlation between the value detected by the temperature detection means 32 and the ambient absolute temperature is obtained by measuring the ambient temperature (detected value) with three or more different reference temperatures and obtaining the correlation. It is possible to derive the correlation f (x) even when is a quadratic function or higher.
[Control parameter switching procedure according to the detected ambient temperature]
A control parameter switching procedure according to the detected ambient temperature will be described with reference to the flowchart of FIG.

FIG. 4 shows a flow from when the recording / reproducing apparatus 10 actually performs recording or reproduction until the ambient temperature is detected and the control is switched depending on the temperature.
It is assumed that the optical disc recording / reproducing apparatus 10 is operating at an unknown ambient temperature (absolute temperature) (C).

  First, an operation request command is issued from the host system (not shown) to the optical disc recording / reproducing apparatus 10 via the interface 44 (step-R1). At this time, the trigger of the temperature detection operation may be a periodic interruption by an internal timer instead of receiving a command from the outside.

  Upon receiving the operation request command or trigger, the system controller 40 acquires the detection value (C ′) by the temperature detection means 32 (step −R2), and stores the detection value (x = C ′) in the apparatus. The current absolute temperature (y = C) is derived from the correlation f (x) {expression (1)} stored in the device 42 by using the internal information processing module 41 (step -R3).

  Subsequently, the system controller 40 compares and confirms whether the derived absolute temperature (C) is equal to or higher than the set temperature (α) in the apparatus (step -R4), and determines that it is not equal to or higher than the set temperature (α). Then, a comparison is made to see if it is higher than another set temperature (β) (β <α) (step -R5), and if it is determined that it is not higher than the set temperature (β), another set temperature (γ) (γ <β) A comparison is made to see if it is above (step-R6). In this way, it is determined which range of the internal reference temperature the derived absolute temperature (C) corresponds to.

  When it is confirmed that the derived absolute temperature (C) is equal to or higher than the set temperature (α), the control parameter is switched to a control parameter suitable for the set temperature (α) (step -R7). Similarly, when it is confirmed that the derived absolute temperature (C) is less than the set temperature (α) and is equal to or higher than the set temperature (β), the control parameter is switched to a control parameter suitable for the set temperature (β) (step −R8). If it is confirmed that the temperature is less than (β) and is equal to or higher than the set temperature (γ), the control parameter is switched to a control parameter suitable for the set temperature (γ) (step-R9). When the derived absolute temperature (C) is lower than the set temperature (γ), the control parameter is not switched.

Thereafter, the recording / reproducing apparatus is controlled in accordance with the switched control parameter (step-R10).
Here, regarding the switching of the control parameter suitable for the absolute temperature (C), the most appropriate parameter among several control parameters in advance is derived by comparison with some set temperatures as described above. Although the method is general, it may be a control parameter that changes in an analog manner calculated using a stored correlation (for example, a linear function) based on the derived absolute temperature (C). The latter can also lead to a more appropriate value.
[Example of switching control parameters]
An example of switching control parameters that conform to the absolute temperature (C) will be described.

The optical disk recording / reproducing apparatus 10 has recording speeds of 8 times, 12 times, 20 times, and 24 times, and the system controller 40 normally sets the maximum recording speed as 24 times for a specific disk as internal information in advance. However, since the recording characteristics deteriorate in a high temperature environment, the maximum recording speed is limited to 20 times the speed when it is 40 ° C. (β) or more. Conditional expression (i)
・ If the temperature is 47 ° C. (α) or higher, the maximum recording speed is limited to 12 × speed. … Conditional expression (ii)
When the conditional expression is established,
When the current ambient temperature (absolute temperature) corrected by the temperature information correction unit 41 from the value detected by the temperature detection unit 32 is 42 ° C., the system controller 40 sets the detected ambient temperature of 42 ° C. By comparing with conditional expressions (i) and (ii),
40 ° C (β) <42 ° C <47 ° C (α)
From this relationship, it is derived that the detected ambient temperature of 42 ° C. matches the conditional expression (i).

  For example, in the recording operation with ZCLV, the speed control is normally performed by switching from 12 times speed to 20 times speed to 24 times speed. However, due to the limitation of the maximum recording speed of 20 times speed, the switching control of 12 times speed to 20 times speed to 20 times speed is performed. To do.

  That is, the system controller 40 changes the upper limit of the recording speed of the recording speed switching means 51 that switches the recording speed when data is recorded on the optical disc 20 according to the correction temperature information (absolute temperature).

  Similarly, the system controller 40 changes the upper limit value of the reproduction speed of the reproduction speed switching means 52 that switches the reproduction speed at the time of reproducing data from the optical disc 20 according to the correction temperature information (absolute temperature).

The system controller 40 can switch or change the following control parameters in accordance with the correction temperature information (absolute temperature).
The recording strategy information at the time of recording is switched to the optimum strategy stored in the strategy information storage means 62.

The laser power during reproduction of the optical disk is changed by the laser power switching means 61.
-The offset value of the focus offset switching means 71 is changed.

-The PLL control switching means 64 changes the PLL control characteristics (such as operating frequency) of the PLL means 63.
The data slice characteristic of the means 65 for controlling the data slice characteristic is changed by controlling the data slice characteristic switching means 66.

The profile switching means 74 is controlled to change the acceleration degree and the maximum speed during the seek operation of the profile means 74.
-The traverse drive capability of the traverse drive capability switching means 72 is changed.
[Action]
The operation of the optical disc recording / reproducing apparatus according to the above configuration / method will be described.

For example, in the inspection process of the optical disc recording / reproducing apparatus, the inspection is performed in at least two environments of normal temperature and high temperature (both known).
First, in an inspection under an environment of normal temperature (known; reference temperature A), a temperature information value obtained from the temperature detection means 32 and a known ambient temperature are stored by a trigger from a host system (for example, an inspection device).

Next, also in the inspection under a high temperature (known; reference temperature B), the temperature information value obtained from the temperature detecting means 32 and the known ambient temperature are similarly stored by a trigger from the inspection apparatus.
Then, when the temperature information value obtained from the temperature detection means 32 and the absolute temperature are stored in at least two different environments, the detection value (temperature information value) x obtained from the temperature detection means 32 and the absolute temperature y are stored. The correlation equation f (x) is calculated, and the correlation equation is stored.

  In advance, a temperature-specific control pattern based on the absolute temperature is stored in the storage device 42 in the optical disk recording / reproducing apparatus, and the optical disk 20 is inserted into the recording / reproducing apparatus 10 when the apparatus is actually used. The current temperature is detected by the temperature detection means 32, and the temperature information is detected by using the correlation with the absolute temperature stored in the storage device 42 in advance in the information processing module 41 in the system controller 40. Convert to

Based on the detected and converted absolute temperature, an instruction suitable for the ambient temperature is instructed to the pickup control means 35, the signal processing means 36, and the spindle motor control means 37.
As described above, as shown in FIGS. 2 and 3, the correlation f (x) between the temperature detecting means 32 and the ambient temperature is derived in advance and stored in the storage device 42 inside the apparatus, and actually 4, the current ambient temperature is detected by the temperature detecting means 32, and the temperature information is converted into an absolute temperature based on the correlation f (x) stored in advance, as shown in FIG. By setting more accurate and more appropriate parameters based on the absolute temperature, that is, by switching the control of the apparatus, the recording / reproduction quality can be maintained, and more stable recording / reproduction can be performed.
Although the present invention is directed to an optical disk recording / reproducing apparatus, of course, the present invention has only an optical disk reproducing apparatus having only a function for reproducing data recorded on the optical disk 20 or a recording function for recording data on the optical disk 20. It can be applied to optical disc recording devices and duplicators that do not. At this time, with the absolute temperature obtained by correcting / converting the temperature information detected by the temperature detecting means 32 by the information processing module 41, the optical disc reproducing apparatus uses, for example, the upper limit of the reproducing speed of the reproducing speed switching means 52 of the spindle control module 37. In the optical disk recording apparatus, for example, the upper limit value of the recording speed of the recording speed switching means 51 of the spindle control module 37 is changed.

  The optical disc recording / reproducing apparatus according to the present invention can switch the control of the apparatus according to the ambient temperature with reference to the absolute temperature, has an effect of more stable operation, and is used in a special temperature environment. This is useful in the field of recording / reproducing data.

It is a block diagram of the optical disk recording / reproducing apparatus in embodiment of this invention. 6 is a flowchart for explaining the process until the correlation between the temperature information detected by the temperature detecting means and the absolute temperature is derived in advance in the optical disc recording / reproducing apparatus. FIG. 5 is a characteristic diagram showing a correlation between temperature information detected by a temperature detection unit and an absolute temperature in the optical disc recording / reproducing apparatus. In the optical disk recording / reproducing apparatus, a flow chart for explaining the process from deriving the current absolute temperature from the correlation between the temperature information detected by the temperature detecting means and the absolute temperature stored in advance, and switching the control method according to the value. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk recording / reproducing apparatus 20 Optical disk (recording / reproducing medium)
Reference Signs List 30 pickup 32 temperature detection means 35 pickup control means 36 signal processing means 37 spindle motor control means 39 spindle motor 40 system controller 41 information processing module 42 storage device 44 interface

Claims (22)

An optical disc recording / reproducing apparatus for recording data on an optical disc and reproducing the data from the optical disc,
Temperature information detecting means for detecting temperature information around the optical disk inserted into the apparatus or around the optical disk;
Reference temperature information storage means for storing detected values respectively measured by the temperature information detection means together with the reference temperature in a state where the absolute temperature around the temperature information detection means is set to two or more reference temperatures set in advance. ,
A temperature for correcting the detected value of the temperature information detecting means to the absolute temperature around the temperature information detecting means based on information of a pair of two or more reference temperatures and detected values stored in the reference temperature information storing means Information correction means;
An optical disc recording / reproducing apparatus comprising: switching means for switching control of the recording / reproducing apparatus based on the absolute temperature obtained by the temperature information correcting means. The temperature information correction unit is configured to convert a detection value of the temperature information detection unit from a set of two or more reference temperatures and detection values stored in the reference temperature information storage unit, and to obtain an absolute temperature around the temperature information detection unit. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein a rule for correcting the temperature information is approximated by a function of a first order or higher and the detected value of the temperature information detecting means is corrected to an absolute temperature according to the rule. A recording speed switching means for switching the recording speed at the time of recording the optical disc;
3. The optical disk recording according to claim 1, wherein the switching unit changes the upper limit of the recording speed of the recording speed switching unit according to the absolute temperature obtained by the temperature information correction unit. Playback device. Strategy information storage means for storing optimum recording strategy information for each ambient temperature at the time of recording the optical disc,
The switching means switches the recording strategy information to a strategy stored in the strategy information storage means according to the absolute temperature obtained by the temperature information correction means. Optical disc recording / reproducing device. A playback speed switching means for switching the playback speed during playback of the optical disc;
3. The optical disk recording according to claim 1, wherein the switching unit changes the upper limit value of the reproduction speed of the reproduction speed switching unit according to the absolute temperature obtained by the temperature information correction unit. Playback device. Comprising laser power switching means for switching the laser power during playback of the optical disc;
The said switching means changes the laser power at the time of the said optical disk reproduction | regeneration by the said laser power switching means according to the absolute temperature calculated | required by the said temperature information correction means. Optical disc recording / reproducing device. A focus offset switching means for switching a focus servo control offset value at the time of recording and reproducing the optical disc;
3. The optical disc recording / reproducing apparatus according to claim 1, wherein the switching unit changes the offset value of the focus offset switching unit according to the absolute temperature obtained by the temperature information correction unit. . PLL means for extracting a reproduction clock from the reproduction signal of the optical disc and reproducing data in synchronization with the reproduction clock;
PLL control switching means for switching the operating frequency characteristics of the PLL means,
The said switching means changes the PLL control characteristic of the said PLL means by the said PLL control switching means according to the absolute temperature calculated | required by the said temperature information correction means. Optical disc recording / reproducing device. Means for controlling data slice characteristics for binarizing a reproduction signal of the optical disc; and data slice characteristics switching means for switching the data slice characteristics;
The switching means controls the data slice characteristic switching means according to the absolute temperature obtained by the temperature information correction means to change the data slice characteristic of the means for controlling the data slice characteristic. An optical disk recording / reproducing apparatus according to claim 1 or 2. Profile means for determining the degree of acceleration / deceleration and maximum speed during the optical disk seek operation, and profile switching means for switching the profile means,
The switching means controls the profile switching means according to the absolute temperature obtained by the temperature information correcting means to change the acceleration degree and the maximum speed during the seek operation of the profile means. The optical disc recording / reproducing apparatus according to claim 1 or 2. Traverse drive capability switching means for controlling the drive capability of a traverse for moving a pickup for recording and reproducing information with respect to the optical disc;
3. The switching unit according to claim 1, wherein the switching unit changes the traverse driving capability by controlling the traverse driving capability switching unit in accordance with the absolute temperature obtained by the temperature information correcting unit. Optical disc recording / reproducing device. A method for controlling an optical disc recording / reproducing apparatus for recording data on an optical disc and reproducing data from the optical disc,
Temperature information about the optical disk or the optical disk is detected in a state where the absolute temperature around the optical disk or the optical disk is set to two or more predetermined reference temperatures, and detection is performed based on the reference temperature and the detected temperature information. Obtain a correlation function between temperature information and the absolute temperature,
When the temperature information of the optical disc or the periphery of the optical disc is detected in actual use, the detected temperature information is converted into an absolute temperature by the correlation function, and the control of the recording / reproducing apparatus is switched based on the absolute temperature. A method of controlling an optical disc recording / reproducing apparatus. 13. The method of controlling an optical disc recording / reproducing apparatus according to claim 12, wherein a correlation function between the absolute temperature and the detected temperature information is obtained by approximating with a linear function or higher. 14. The method of controlling an optical disk recording / reproducing apparatus according to claim 12, wherein an upper limit of a recording speed at the time of recording the optical disk is changed according to an absolute temperature obtained by converting the detected temperature information by a correlation function. . 14. The method of controlling an optical disc recording / reproducing apparatus according to claim 12, wherein the recording strategy information at the time of recording the optical disc is switched in accordance with an absolute temperature obtained by converting the detected temperature information using a correlation function. 14. The control of the optical disc recording / reproducing apparatus according to claim 12, wherein an upper limit value of a reproduction speed at the time of reproducing the optical disc is changed according to an absolute temperature obtained by converting the detected temperature information by a correlation function. Method. 14. The method of controlling an optical disc recording / reproducing apparatus according to claim 12, wherein the laser power at the time of reproducing the optical disc is changed in accordance with an absolute temperature obtained by converting the detected temperature information by a correlation function. 14. The control of an optical disc recording / reproducing apparatus according to claim 12 or 13, wherein a focus servo control offset value at the time of optical disc recording / reproduction is changed according to an absolute temperature obtained by converting the detected temperature information by a correlation function. Method. A reproduction clock is extracted from a reproduction signal reproduced from the optical disc in accordance with an absolute temperature obtained by converting the detected temperature information by a correlation function, and a PLL control characteristic of the PLL means for reproducing data is changed in synchronization with the reproduction clock. 14. A method for controlling an optical disc recording / reproducing apparatus according to claim 12 or claim 13, wherein: The data slice characteristic of the means for controlling the data slice characteristic for binarizing the reproduction signal reproduced from the optical disc is changed in accordance with an absolute temperature obtained by converting the detected temperature information by a correlation function. 14. A method for controlling an optical disc recording / reproducing apparatus according to claim 12 or claim 13. According to the absolute temperature obtained by converting the detected temperature information by a correlation function, the degree of acceleration and deceleration during the seek operation of the optical disc and the maximum speed of the profile means for changing the acceleration degree and the maximum speed during the seek operation are changed. 14. A method for controlling an optical disk recording / reproducing apparatus according to claim 12 or 13, wherein: 13. The traverse drive capability of the traverse drive capability switching means for controlling the traverse drive capability for moving the pickup is changed according to the absolute temperature obtained by converting the detected temperature information using a correlation function. Item 14. A method for controlling an optical disc recording / reproducing apparatus according to Item 13.

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