JP2003091853A - Light quantity adjusting device and optical recording system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately execute setting of various light outputs with high working efficiency by appropriately adjusting an output level of a light source. SOLUTION: Reference values for setting layer power output levels of an LD (Laser Diode) being a laser beam source of an optical disk are initially set to 0.7 mW and 1.0 mW (Steps S1 and S7), and the respective laser powers are measured (Steps S2, S3, S8, and S9). Then, when a deviation between the initial setting value and the measured value is in the standard (Y of Step S11), an expression of relations of the laser power and the reference value is derived as follows (Step S16), data of a primary coefficient of the expression of relations and a section are transmitted to an optical disk drive, and the data are recorded on a memory (Step S17).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount adjusting device and an optical recording system for adjusting the light amount of a light source such as an optical disk drive.

[0002]

2. Description of the Related Art Conventionally, in the adjustment of laser power in an optical disk drive, first, a predetermined laser power is output, and the output power is read and compared with a predetermined reference value. When it is determined that a malfunction has occurred, a predetermined substrate inside the optical disk drive is taken out and the resistance value of the variable resistor directly connected to the drive current control circuit is reset.

Further, as a means for performing adjustment without taking out a substrate from the optical disk drive, when a predetermined laser power is emitted, information about the setting of the laser power is written in a memory inside the optical disk drive to be a light source. There is a technique of adjusting the output of a desired laser power by reading the information written in the memory when the laser diode (LD) emits light, by the optical disk drive.

As an example of this, Japanese Patent Laid-Open No. 1897/1993
There is a technique disclosed in Japanese Patent Laid-Open No. 65. According to the laser power adjustment method for an optical disc drive disclosed in the publication, reproduction power information indicating a laser power value used when reproducing information on an optical disc, and recording power information indicating a laser power value when recording information. An operator inputs erasing power information representing laser power for erasing information from a host computer and transmits the information to an optical disk drive device through an interface. On the other hand, in the optical disk drive, a current control signal is generated based on the information set by the operator to cause the LD to emit light. Then, when the light quantity of the laser is measured by a power meter connected to the outside and the desired result is not obtained, the operator sets L
The information of the output of D is input again in the host computer. In the technique disclosed in Japanese Unexamined Patent Publication No. 5-189765, the laser power is adjusted by repeating the above processing and writing the adjusted laser power information in the memory.

[0005]

However, in the above-mentioned prior art, the work efficiency is still low, and three kinds of laser powers for reading, writing and erasing the optical disk are set. R / RW, DV
For reading various optical discs such as D,
Since the laser powers for writing and erasing are different, there is also a problem that the laser power information must be set for various optical disks.

An object of the present invention is to make it possible to automatically adjust the output level of the light source appropriately so that the working efficiency is high and various light output settings can be made appropriately.

An object of the present invention is to enable the output level of the light source to be set more accurately.

An object of the present invention is to make it possible to appropriately adjust the light output of the light source even when the light output of the light source is monitored and the light output of the light source is corrected.

An object of the present invention is to make it possible to appropriately adjust the optical output of a light source for various optical recording medium drive devices by removing the offset on the circuit.

An object of the present invention is to detect an abnormality in the set value of the light output of the light source and prevent the destruction of the light source.

An object of the present invention is to perform light output adjustment corresponding to the temperature characteristic of a light source.

An object of the present invention is to detect an abnormality in the measured value of the light amount of the light source, an abnormality in the external temperature, etc., and adjust the light output of the light source corresponding to the temperature characteristic of the light source.

An object of the present invention is to reduce the adjustment man-hours for adjusting the light output of the light source while corresponding to the temperature characteristics of the light source.

An object of the present invention is to adjust the light output of the light source corresponding to the temperature characteristics of the light source in each device.

[0015]

According to a first aspect of the present invention, there is provided an optical recording medium drive device for irradiating light from a light source to perform at least one of reading, writing and erasing of information on an optical recording medium. On the other hand, the light output of the light source is set to a predetermined value, the light emitting means for emitting the light source at the set value, and the light amount detection sensor for detecting the light emission
Relational expression calculating means for calculating a relational expression between the detected light quantity and the set value, first setting means for setting data relating to the obtained relational expression in the optical recording medium drive device, and the light emitting means A light amount adjusting device comprising: light emission of a light source; detection by the light amount detection sensor; calculation by the calculation unit; and execution unit that sequentially executes setting by the first setting unit.

Therefore, since the relationship between the light quantity of the light source and the set value of the light output is automatically obtained and the data of the relational expression is set in the optical recording medium drive device, the output level of the light source can be appropriately adjusted. The work efficiency is high, and various light outputs can be appropriately set.

According to a second aspect of the present invention, in the light amount adjusting device according to the first aspect, the relational expression calculating means uses the relational expression as a quadratic or higher expression or a least square regression. It is calculated by

Therefore, the characteristic of the light source can be expressed more accurately by the relational expression, and the output level of the light source can be set appropriately.

According to a third aspect of the present invention, there is provided an optical recording medium drive device which irradiates light with a light source to perform at least one process of reading, writing and erasing information on the optical recording medium, and the first or the second aspect. 2. A light amount adjusting device according to 2,
It is an optical recording system equipped with.

Therefore, the same operation and effect as those of the invention according to claim 1 or 2 can be obtained.

According to a fourth aspect of the present invention, in the light amount adjusting apparatus according to the third aspect, the optical recording medium drive device monitors the optical output of the light source and corrects the optical output of the light source. Means, and at least stop means for stopping during the execution of the processing by the execution means.

Therefore, even when the light output of the light source is monitored and the light output of the light source is corrected, the light output of the light source can be appropriately adjusted.

According to a fifth aspect of the invention, in the optical recording system according to the fourth aspect, a light receiving element for receiving the reflected light from the optical recording medium by the light irradiation, and an output of the light receiving element are constant. Comparing means for comparing with the reference value and comparing means for adjusting the offset of the circuit of the optical recording medium drive device according to this comparison, the executing means, after the adjustment by the adjusting means, the light emitting means. The light emission of the light source and the detection by the light amount detection sensor,
The calculation by the relational expression calculating means and the setting by the first setting means are sequentially executed.

Therefore, the optical output of the light source can be properly adjusted by removing the offset on the circuit for various optical recording medium drive devices.

The invention according to claim 6 is the invention according to claim 4 or 5.
The optical recording system described in (1) above is provided with safety holding means for blocking or suppressing the light emission when the set value set by the light emitting means is a predetermined abnormal value.

Therefore, since the abnormality of the set value of the light output of the light source is detected and the light emission is blocked or suppressed, the light source can be prevented from being destroyed.

According to a seventh aspect of the present invention, in the optical recording system according to any one of the fourth to sixth aspects, the fluctuation range of the detected light amount is calculated from a plurality of detection values by the light amount detection sensor. A shake width calculation means, a comparison means for comparing the shake width with a predetermined value, a calculation performed by replacing the detected value by the shake width calculation means with a new one, and a comparison by the comparison means. And a repeating means that repeats a predetermined number of times until the swing width falls below the predetermined value, and the executing means emits light from the light source by the light emitting means when the swing width falls below the predetermined value in the comparison result. The detection by the light amount detection sensor, the calculation by the relational expression calculating unit, and the setting by the first setting unit are sequentially executed.

Therefore, the light output can be adjusted according to the temperature characteristics of the light source.

The invention according to claim 8 is the optical recording system according to claim 7, further comprising abnormality determining means for determining that an abnormality has occurred when the number of repetitions by the repeating means reaches the predetermined number of times. .

Therefore, it is possible to detect an abnormality in the measured value of the light amount of the light source, an abnormality in the external temperature, etc., and it is possible to adjust the light output of the light source corresponding to the temperature characteristic of the light source.

The invention according to claim 9 is the invention according to claim 7 or 8.
In the optical recording system according to the item (1), a value adjusting unit that adjusts by adding a predetermined value to the value of the light amount detected by the light amount detecting sensor is provided, and the relational expression calculating unit includes the adjusted value and the light emitting unit. The relational expression with the set value is calculated.

Therefore, it is possible to reduce the adjustment man-hours for adjusting the light output of the light source while corresponding to the temperature characteristics of the light source.

According to a tenth aspect of the present invention, in the optical recording system according to the ninth aspect, a predetermined value to be added to the value of the light amount by the value adjusting means is derived in accordance with a change in the light amount of the light source due to temperature characteristics. It has a value calculation means for performing.

Therefore, the light output of the light source can be adjusted corresponding to the temperature characteristics of the light source in each device.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment of the Invention] An embodiment of the present invention will be described as a first embodiment of the invention.

FIG. 1 is a block diagram showing the configuration of an optical recording system according to an embodiment of the present invention. As shown in FIG. 1, reference numeral 100 is an optical disk drive which is an optical recording medium drive device. The optical disc drive 100 is a device that reads, writes, and erases information by irradiating an optical disc such as a CD or a DVD, which is an optical recording medium, and is a light source that emits a laser that is a light that irradiates the optical disc. A relational expression between the laser power of the LD 101 and the laser power of the LD 101 and the reference value which is the set value of the optical output of the LD 101 (described later). ) By various calculations and controls, a memory 104 functioning as a work area of the CPU 103, and an I / O 105 for communicating with the outside.

Reference numeral 200 is an optical disk drive device 1.
00 is a laser power adjusting device which is an optical output adjusting device for adjusting the laser power of the LD 101. The laser power adjustment device 200 includes a power meter 201, which is a light amount detection sensor that receives a laser output from the LD 101 and measures the laser power, and a personal computer 300 that serves as a host computer of the optical disc drive device 100.

The personal computer 300 is a CPU
Memory 301, which is a work area of 302, various calculations,
CPU 302 for controlling, optical disk drive device 10
I / O for connecting 0 to the personal computer 300
A monitor 304 such as 303, a CRT, and an LCD, and an I / O 305 that connects the power meter 201 and the personal computer 300 are provided. Although not shown, a hard disk storing various programs and fixed data for executing the following processing is also connected to the bus via a predetermined I / O.

Next, the operation of the apparatus shown in FIG. 1 will be described.

First, the adjustment of the laser power output level when reading information from the optical disk drive 100 will be described. FIG. 2 is a flow chart for explaining the processing executed by the laser power adjusting apparatus 200 based on the program when performing such adjustment. This processing implements the executing means.

As shown in FIG. 2, first, the CPU 302
Sets the laser power output level of LD101 to 0.7 mW
Optical disc drive 10
After 0 (step S1), the LD 101 is caused to emit light (step S2). In the initial setting, for example, the reference value or LD1 set as the target value of the read power is set.
The gain of 01 (LD gain) is set. Then, the laser power value of the LD 101 is measured by the power meter 201 and stored in the memory 301 (step S
3) The CPU 302 calculates the deviation amount between the stored laser power and the reference 0.7 mW (step S
4) By comparing the deviation amount with the reference value, it is determined whether or not the deviation amount is within a preset standard (step S5). If the amount of deviation is out of the reference value, the optical disc drive 100 is caused to reset the LD gain (step S6), and the operations from step S2 onward are repeated.

When the LD gain is reset, the LD gain is 1L.
Using the value obtained by converting the adjustment sensitivity in SB from the immediately preceding two measurements, the laser power of the LD 101 is set to 0.
Adjust so that it becomes 7 mW.

That is, LDgain [1]: LD gain at initial setting LDgain [N]: Nth LD gain Pr [N]: Nth laser power measurement value Delta_Pr [1]: LD gain at initial setting Power sensitivity Delta_Pr [N]: Assuming the power sensitivity for the Nth LD gain, the LD gain value to be reset is: 1st: N = 1 LDgain [2] = LDgain [1] + (0.7mW- (laser power measurement Value)) / Delta_Pr [1]… (1) Second time and after: N> 1 LDgain [N + 1] = LDgain [N] + (0.7mW − Pr [N]) / Delta_Pr [N]… (2) Delta_Pr [N] = (Pr [N] −Pr [N-1]) / (LDgain [N] −LDgain [N-1]) (3).

Next, the laser power output level is 1.0 m.
The optical disc drive apparatus 100 is caused to set the reference value so that it becomes W (step S7), and the LD 101 is caused to emit light at the reference value (step S7).
8) Then, the laser power is measured by the power meter 201 (step S9). The measured laser power value is stored in the memory 301, and the CPU 302 calculates the deviation amount between the stored laser power and the reference 1.0 mW (step S10), and the deviation amount is set to a preset standard. It is judged whether or not it is within (step S1
1). The light emitting means is realized by steps S1, S2, S7, and S8. If the deviation amount of the measured value is 1.0 mW or more or less than the standard range (N in step S11), L
D gain is added or subtracted (steps S12 to S1
4) The laser power output level of 0.7 mW is initialized by the optical disk drive device 100 (step S15), and the laser power is adjusted by the following operation in step S2.

If the deviation amount is within the standard (step S11)
Y), the output level of the laser power is 0.7 mW and 1.
Laser power measurement value at 0 mW (steps S3, S
9), the relational expression between the laser power and the reference value is derived as follows (step S16), and the primary coefficient and intercept data of the relational expression are transmitted to the optical disc drive 100 and recorded in the memory 104. (Step S17). In step S16, the relational expression calculating means is
The first setting means is realized by step S17.

The relational expression between the laser power and the reference value is as follows: Pr: Measured laser power value for read Pr_A: First-order coefficient Pr_B: Intersection PRref: Reference value for read Pr = Pr_A × PRref + Pr_B. (4)

As a result, the optical disc drive 100
Is to output the laser power for any read, using the first-order coefficient and intercept recorded in the memory 104,
A reference value is obtained by performing an operation based on the equation (4), and the light amount control circuit 10 is calculated according to the reference value.
By controlling the light amount of the LD 101 by 2, the LD 101 can output a desired laser power.

Next, the optical disk drive 1 is attached to the optical disk.
The adjustment of the laser power output level when writing information with 00 will be described. FIG. 3 is a flowchart illustrating a process executed by the laser power adjusting apparatus 200 based on the program when performing such adjustment. The execution means is realized by such processing.

As shown in FIG. 3, first, a predetermined count value n is set to an initial value 1 (n = 1) (step S2).
0), LD101 with laser power output level of 10 mW
The optical disc drive 10 is initialized to emit light.
0 (step S21), the LD 101 is caused to emit light (step S22), and the power meter 201 outputs the LD.
The laser power of 101 is measured (step S23).
The light emitting means is realized by steps S21 and S22.

Then, until the count value n reaches 4 (N in step S29), the count value n is incremented by +1 (step S28) and the processing from step S21 is repeated until the laser power output level is 20 m.
The laser power of the LD 101 at W and 30 mW is measured.

Then, a deviation amount between each measured laser power output level and a predetermined reference value is calculated (step S
24) If at least one of the laser power output levels is out of the preset standard (N in step S25), the laser power for writing is adjusted in the same manner as the adjustment of the laser power for reading described above. And the relational expression of the reference value are derived as follows (step S26),
The coefficient of the relational expression (first order in this example) and the intercept data are transmitted to the optical disc drive 100 and stored in the memory 104 (step S27). The relational expression calculating means is realized by step S26, and the first setting means is realized by step S7.

The relational expression between the laser power and the reference value is as follows: Pw: Measured laser power value for writing Pw_A: First-order coefficient Pw_B: Intersection PWref: Reference value for writing Pw = Pw_A × PWref + Pw_B … (5)

Then, the LD 101 is caused to emit light at 33 mW which is the laser power for writing the CD-R (step S
30, S31), and the laser power is measured by the power meter 201 (step S32). Then, it is confirmed how much the laser power deviates from the level of the desired reference value (step S33). If the deviation amount is outside the preset standard (N in step S34), the laser power cannot be adjusted. A message to that effect is displayed on the monitor 304 (step S35), and the laser power adjustment ends.

Instead of equations (4) and (5), higher-order relational equations such as the following equations (6) and (7) may be used.

For example, the relational expression between the laser power for reading and the reference value is as follows: Pr: measured laser power for reading Pr_A: second-order coefficient Pr_B: first-order coefficient Pr_C: intercept PRref: reference value for read Then, Pr = Pr_A × PRref ² + Pr_B × PRref + Pr_C (6)

Regarding the relational expression between the laser power for writing and the reference value, Pw: Measured laser power for writing Pw_A: Second-order coefficient Pw_B: First-order coefficient Pw_C: Intersection PWref: Reference value for writing , Pw = Pw_A × PWref ² + Pw_B × PWref + Pw_C (7).

In this example, the relation between the laser power and the reference value is approximated by using a quadratic equation, but it is conceivable to use an equation of third or higher order.

Further, instead of the equations (4) to (7), a relational expression expressing the relation between the laser power and the reference value by using the least square regression may be used.

That is, if the laser power and the reference value have a linear relationship, the relationship between the laser power and the reference value can be regressed by the least squares line.

For example, the least squares regression line to be obtained is   y = a + bx (8) And

Then, the deviation d (distance) between the y value on the least squares regression line with respect to the set reference value and the laser power corresponding to the reference value is d ₁ = a + bx ₁ -y ₁ , d ₂ = a + bx ₂ -y ₂ , ..., d _n = a + bx _n -y _n ... (9) where x _{1 to} x _n : set reference value y _{1 to} y _n : laser power corresponding to the reference value Therefore, the sum of squared deviations is Σd ² = Σ (a + bx -y) ² (10).

Then, the condition of the least-squares straight line to be obtained is that this value becomes the smallest. Therefore, if the above equation is a function of a and b, then F (a, b) = Σ (a + bx-y) ² (11).

The minimum condition is that F (a, b) is partially differentiated with respect to a and b, and ∂F / ∂a = 0 ... (12) ∂F / ∂b = 0 ... (13) Is to be.

Therefore, ∂F / ∂a = Σ (∂ / ∂a) (a + bx-y) ² = Σ2 (a + bx-y) (14) ∂F / ∂b = Σ (∂ / ∂ b) (a + bx-y) ² = Σ2x (a + bx-y)… (15) That is, Σ (a + bx-y) = 0 ∴Σ y = an + bΣx… (16) Σx (a + bx -y) = 0 ∴Σxy = aΣx + bΣx ² (17)

The equations (16) and (17) are called normal equations of the least squares straight line.

From the normal equation, a and b are a = {(Σy) (Σx ² )-(Σx) (Σxy)} / {nΣx ^2- (Σx) ² } ... (18) b = {nΣxy-( Σx) (Σy)} / {nΣx ^2- (Σx) ² } ... (19)

By applying the obtained a and b to the equation (8), the least-squares regression line of the measured laser power and the reference value can be obtained.

When the laser power and the reference value are approximated by a quadratic equation, the equation to be obtained is y = ax + bx + cx ² ... (20), and the normal equation is Σy = an + bΣx + cΣx ² ... (21) Σxy = aΣx + bΣx ² + cΣx ³ (22) Σx 2y = aΣx ² + bΣx ³ + cΣx ⁴ (23)

From the above normal equations (21) to (23), a,
A least squares regression curve can be expressed by finding b and c and applying them to the equation (20). Even if it is a cubic expression or more, an approximate curve using least squares can be expressed by performing the same calculation.

In the adjustment of the laser power for reading and writing as described above, the laser power output level is set to two points (steps S3 and S) at the time of adjusting the laser power for reading.
9) While the laser power for writing is adjusted, the laser power output level is set to 3 points (step S23), but more sample points may be used.

Further, the setting of the output value of the LD 101 (steps S1, S7, S21, S33) may be any value which allows the correlation between the laser power and the reference value to be confirmed, or the laser power for reading and writing. Because of the difference
In consideration of the characteristics of D101, the laser power is adjusted by separate processing for reading and writing.
If the characteristic of 01 can be approximated by the relational expression of the laser power and the reference value, the adjustment may be performed by the same process.

Further, at the end of the laser power adjustment, the confirmation is made with the CD-R writing laser power (step S30 and thereafter), but the laser of any size other than the CD-R writing laser power is used. The power output level may be set and the relational expression (5) between the laser power and the reference value may be confirmed (step S30 and thereafter). If it can be assumed that the relational expression (5) is sufficiently satisfied, such confirmation processing may not be performed.

[Second Embodiment of the Invention] Another embodiment of the present invention will be described as a second embodiment of the invention.

In the following description, the first embodiment of the invention will be described.
Regarding the circuit elements and the like common to the first embodiment,
The detailed description will be omitted by using the same reference numerals.

FIG. 4 is a block diagram showing the structure of the optical recording system according to the second embodiment of the invention. This optical recording system is different from the first embodiment of the invention in that the optical disc drive 100 monitors the laser power of the LD 101 to correct the output of the LD 101 and monitors the FSPD (Front).
Side Photo Detector) 106, A / D converter 11 for A / D converting the analog output value of this FSPD 106
7. I / O for connecting the A / D converter 117 to the bus
118 and an output correction circuit 107 that corrects the reference value given to the light amount control circuit 102 by the current value output from the FSPD 106, and the program that operates in the laser power adjustment device 200 is different. Is to be executed. The execution means is realized by such processing.

That is, the laser power for writing is required to change the power pulse in a very short time in consideration of the write quality. Therefore, correct information cannot be written unless the power is set by monitoring the laser power successively.

Therefore, conventionally, the optical disk drive 100
Then, in order to monitor the laser power, a photodetector called the front photodetector (the FSPD 106 described above).
Is installed in front of the LD 101 of the optical disc drive 100. The FSPD 106 monitors the laser power of the LD 101 and feeds it back to the optical disc drive 100 to adjust the laser power applied to the optical disc to a desired value. This implements the correction means.

However, such an FSPD 106
If the laser power adjustment as described in the first embodiment is performed by performing the processing using
If the feedback correction is applied to the laser power by the correction value for the reference value of the LD 101 based on the output of D106, the correction value is not an appropriate value, which causes a problem that the laser power cannot be adjusted.

Therefore, in the second embodiment, the following processing is performed based on the program. Such processing will be described with reference to the flowchart of FIG. That is, in the laser power adjustment for writing information, first, the FSPD invalidation flag is set in a predetermined area of the memory 104 so that the output correction by the FSPD 106 is not performed (step S40). Then, step S4
Although the processes of 1 to S50 are performed, this process is the same as steps S21 to S29 described above, and detailed description thereof will be omitted. The light emitting means is realized by steps S42 and S43,
The relational expression calculating means is realized by step S49, and the first setting means is realized by step S50.

Next, the value of the FSPD 106 is set in the optical disc drive 100 from the data for adjusting the laser power obtained as described above (step S5).
1), clear the FSPD invalidation flag (step S5
2) Turn on the output correction of the LD 101 based on the output value of the FSPD 106. As a result, the optical disc drive 100 causes the LD 101 based on the output value of the FSPD 106.
It becomes possible to correct the output. Stopping means is realized by steps S40 and S52.

After that, the processes of steps S53 to S58 are performed, and the processes are the same as the steps S30 to S35.

As described above, even if the correction value of the laser power of the LD 101 based on the output of the FSPD 101 is preset, the FSPD invalidation flag is used to set the FSPD.
The laser power can be adjusted while the correction of the reference value of the LD 101 by the output of 101 is prohibited. Then, by canceling the FSPD invalidation flag after that, the reference value of the LD 101 using the FSPD 101 can be corrected, so that the laser power for writing can be appropriately adjusted.

Third Embodiment of the Invention Another embodiment of the present invention will be described as a third embodiment of the invention.

In the following description, the second embodiment of the invention will be described.
Regarding the circuit elements and the like common to the second embodiment,
The detailed description will be omitted by using the same reference numerals.

FIG. 6 is a block diagram showing the structure of the optical recording system according to the third embodiment of the invention. This optical recording system is different from the second embodiment of the invention in that the LD10
1, a photodetector (PD) 108 which is a light receiving element for receiving the reflected light of the laser emitted from the optical disc 1, an addition amplifier 109 for amplifying the received light signal and removing an offset on the circuit, and outputs from the addition amplifier 109. A
A / D converter 110 that performs A / D conversion, I / O 111 that connects A / D converter 110 to a bus, reference voltage setting circuit 112 that outputs a constant voltage such as a reference voltage, and an analog value that gives a digital value to reference voltage setting circuit 112. The D / A converter 113 for conversion, the I / O 114 for connecting the D / A converter 113 to the bus, and the output voltage of the PD 108 converted by a current / voltage conversion circuit (not shown) and the voltage from the reference voltage setting circuit 112 are selected. The laser power adjusting device 2 is provided with a selector circuit 115 for selectively selecting and a I / O 116 for bus-connecting the selector circuit 115.
The program that operates in 00 is different, and the following processing is executed by this program.

That is, in the optical disk drive 100, the selector circuit 115 can switch the input voltage applied to the summing amplifier 109 according to an instruction from the CPU 103. Then, as shown in the flowchart of FIG. 7, first, in the optical disc drive 100, the selector circuit 115 selects the reference voltage setting circuit 112 in accordance with an instruction from the CPU 302 (step S60), and the reference voltage setting circuit 112 outputs the predetermined voltage. The reference voltage of 1 is output to the summing amplifier 109. Then, the output value (A) that the summing amplifier 109 amplifies and outputs the reference voltage is received from the optical disc drive 100 and stored in the memory 301 (step S61).

Next, according to the instruction from the CPU 302, in the optical disc drive 100, the selector circuit 115 switches the voltage applied to the addition amplifier 109 to the output of the PD 108 (step S62). Further, the initial value of the offset cancel setting value for adjusting the offset amount of the circuit set in the memory 104 with respect to the PD 108 is input to the adding amplifier 109, and the output value (B) amplified and output by the adding amplifier 109 is output. It is received from the optical disc drive 100 and stored in the memory 301 (step S6).
3).

Then, the CPU 302 causes the "| BA |"
It is determined whether the value of is within a predetermined range (step S6).
4). The comparison means is realized by step S64.
If it is within the predetermined range (Y in step S64), the offset on the circuit has been removed, so that the process proceeds to adjustment of laser power (steps S73 and 74). The details of this processing are as described with reference to FIGS. 2, 3, and 5.

If it is outside the predetermined range (step S64)
N), the number of times the offset cancellation set value is adjusted is checked (step S65), and when the number exceeds the designated number X (Y in step S65), a message indicating that the adjustment is abnormal is displayed on the monitor 304 (step S66), and the offset The adjustment process ends. If the specified number X is not exceeded (step S65
N), and whether the value of "BA" is positive or negative is determined (step S6).
7) If it is positive (N in step S67), a cancel value "-1" is generated (step S68), and if it is negative (Y in step S67), a cancel value "+1" is generated (step S68). S69). Then, the generated cancel value is sent to the optical disc drive 100 (step S70).

Next, the optical disc drive 100 is caused to add the cancel value received from the personal computer 300 to the offset cancel setting value stored in the memory 104 to adjust the offset cancel setting value. The offset cancel setting value of is stored in the memory 104 (step S71). Then, the offset cancel setting value is read from the memory 104 and sent to the adding amplifier 109 (step S72). After that, the offset on the circuit is adjusted so as to be canceled based on the offset cancel setting value stored in the memory 104 (step S75),
The processing from step S63 onward of the LD 101 is repeated. The adjusting means is realized by steps S67 to S75.

In this example, the offset is measured by using the reference voltage setting circuit 112, but the output value (A) obtained by using the test optical disk drive having no offset is used. Good.

Further, as shown in FIG. 8, the limiter circuit 1
19 may be used for the optical disc drive 100.

That is, the set value of the FSPD 106 and P
If the received light level from D108 is abnormal, the FSP
Based on the abnormality information from D106 and PD108, the light amount control circuit 102 causes an overcurrent to flow to the LD101,
There is a risk of destroying D101.

Therefore, a limiter circuit 119 for realizing a safety holding means is installed on the optical disc drive 100, and an abnormality in the reference value for setting the laser power output is detected, and the abnormality value is shut down.

In this example, the limiter circuit 119 is installed in the preceding stage of the light quantity control circuit 102. As another means, it is conceivable to monitor the voltage value at the subsequent stage of the PD 108, the FSPD 106, the selector 115, or the like, or the current value flowing at the front stage of the LD 101.

[Fourth Embodiment of the Invention] Another embodiment of the present invention will be described as a fourth embodiment of the invention.

In the following description, the third embodiment of the invention will be described.
Regarding circuit elements and the like common to the third embodiment,
The detailed description will be omitted by using the same reference numerals. The circuit configuration of this optical recording system is the third embodiment of the invention shown in FIG.
The difference from the third embodiment of the present invention is that the program operating in the laser power adjusting apparatus 200 is different and the following processing is executed by this program.

In other words, in the above laser power adjustment, even if an attempt is made to output a desired laser power, the laser power changes with time due to the temperature characteristics of the LD 101, and therefore it may not be possible to make an appropriate adjustment in that respect. . Therefore, in this embodiment, by confirming the convergence of the temperature characteristics, the laser power adjustment that also takes into consideration the temperature characteristics of the LD 101 is realized.

That is, as shown in FIG. 9, first, the laser power output level is initially set to emit light at, for example, 0.7 mW (step S80), and then the LD is set.
101 is made to emit light (step S81). In the initial setting, similarly to the first embodiment, for example, the reference value of the read power and the LD gain are set. Then, the output laser power is measured by the power meter 201 (step S82) and stored in the memory 301 (step S8).
3). The laser power at this time is L_Pow_First. Next, wait time, for example, 1 second (step S
84), the laser power is measured (step S85) and stored in the memory 301 (step S86). The laser power at this time is L_Pow_Second. And L_Pow_Fi
The difference value Pow_Diff between rst and L_Pow_Second is calculated as Pow_Diff = L_Pow_First-L_Pow_Second (24) (step S87). Step S87
This implements the swing width calculation means.

Next, LD1 previously set by Pow_Diff
It is compared with the difference value Pow of which the temperature characteristic of 01 is stable (step S88). The comparison means is realized by step S88. If Pow_Diff is larger than Pow (N in step S88), the previous value of L_Pow_Second is entered as L_Pow_First (step S89),
The processing from step S84 onward is repeated. Step S84
Iterative means is realized by the loop to. Pow_Diff
Is smaller than Pow (Y in step S88), the optical disk drive 100 is shifted to read and write laser power adjustment (step S88).
90, S91). The details of this processing are the same as the processing of FIG. 2, FIG. 3, FIG.

By performing the above processing, the LD 101
It is possible to converge the temperature characteristics of and to perform appropriate laser power adjustment.

[Fifth Embodiment of the Invention] Another embodiment of the present invention will be described as a fifth embodiment of the invention.

In the following description, the fourth embodiment of the invention will be described.
Regarding the circuit elements and the like common to those of the fourth embodiment of the invention,
The detailed description will be omitted by using the same reference numerals. The circuit configuration of this optical recording system is the same as that of the fourth embodiment, and the difference from the fourth embodiment of the present invention is that the program operated by the laser power adjusting apparatus 200 is different, and the following processing is executed by this program. Is Rukoto.

That is, in the laser power adjustment of the LD 101, when the abnormality of the power meter 201 or the continuous change of the external temperature occurs, the temperature characteristic of the LD 101 cannot be converged, and the adjustment man-hour is increased. , Or
There is a problem that the laser power is adjusted without being able to determine the abnormality of the power meter 201.

In view of this, this embodiment is intended to realize an optical recording system capable of making the above-mentioned determination in the case of abnormality in the laser power adjustment that converges the temperature characteristics in the fourth embodiment. is there.

That is, as shown in FIG. 10, first, the processing of steps S101 to S109 is performed. Such processing is the same as steps S80 to S110 in the fourth embodiment, and the processing of steps S113 to S115 is also performed. Since it is the same as steps S89 to S91 in the fourth embodiment, detailed description thereof will be omitted. Step S108 realizes the shake amount detecting means, step S109 realizes the comparing means, and a loop to step S105 realizes the repeating means.

Another embodiment of the present invention will be described as a fourth embodiment of the invention.

In the following description, the third embodiment of the invention will be described.
Regarding circuit elements and the like common to the third embodiment,
The detailed description will be omitted by using the same reference numerals. The circuit configuration of this optical recording system is the third embodiment of the invention shown in FIG.
The difference from the third embodiment of the present invention is that the program operating in the laser power adjusting apparatus 200 is different and the following processing is executed by this program.

If Pow_Diff is larger than Pow (N in step S109), the laser power measurement retry count number n (the initial value is reset to 0 in advance).
With the upper limit DEFOULT_N (step S11
0), n> DEFOULT_N (25) (Y in step S110), the monitor 304
The error number of the repetition number is displayed on the
4) The laser power adjustment is completed. Step S110
This implements the abnormality determination means.

When the equation (25) is not satisfied (N in step S110), the laser power measurement retry count number n is incremented by +1 (step S11).
1), the values of L_Pow_First and L_Pow_Second are exchanged (step S113), and the process returns to step S106.

By performing the above processing, L
Corresponding to the temperature characteristic of D101, it is possible to detect the occurrence of abnormality as described above (step S112).

[Sixth Embodiment of the Invention] Another embodiment of the present invention will be described as a sixth embodiment of the invention.

In the following description, circuit elements and the like common to the fourth and fifth embodiments of the invention will be assigned the same reference numerals as in the fourth and fifth embodiments of the invention, and detailed description thereof will be omitted. The circuit configuration of this optical recording system is the same as in the fourth and fifth embodiments.
However, the difference from the fourth and fifth embodiments of the present invention is that the program operating in the laser power adjusting apparatus 200 is different and the following processing is executed by this program.

That is, in the processing of the fourth and fifth embodiments,
Since the measurement of the laser power has to be repeated until the temperature characteristics of the LD 101 become stable, there is also a problem that the adjustment man-hours increase.

Therefore, in this embodiment, steps S90 and S1 are performed when the processing of FIGS. 9 and 10 is performed.
The following process is performed instead of each process of 14.
FIG. 11 is a flowchart showing such processing. As shown in FIG. 11, steps S120 to 122 and S12
4 to S129 and S131 to S138 are similar to the processes of steps S1 to S17 shown in FIG. 2, and detailed description thereof will be omitted.

In the processing of FIG. 11, the temperature characteristic correction laser power shift amount, which is a predetermined value for correcting the temperature characteristic, is added to the laser power value measured by the power meter 201 (steps S122 and S129). (Steps S123 and S130), the value after the addition is treated as the measured value of the laser power. Step S123,
A value adjusting means is realized by S130, and a relational expression calculating means is realized by step S137.

As a result, the laser power measurement is repeated until the temperature characteristic of the LD 101 becomes stable (step S8).
4, the loop returning to S105) is not necessary, so that the adjustment man-hour can be reduced.

Similarly, in the adjustment of the laser power for writing (see FIG. 3), it is possible to deal with the temperature characteristic of the LD 101 by adding the temperature characteristic correction laser power shift amount after measuring the laser power. You can Further, in this example, the shift amount is added to the laser power measurement value, but the reference value may be added.

[Seventh Embodiment of the Invention] Another embodiment of the present invention will be described as a seventh embodiment of the invention.

In the following description, circuit elements and the like common to the fourth and fifth embodiments of the invention will be assigned the same reference numerals as in the fourth and fifth embodiments of the invention, and detailed description thereof will be omitted. The circuit configuration of this optical recording system is the same as in the fourth and fifth embodiments.
However, the difference from the fourth and fifth embodiments of the present invention is that the program operating in the laser power adjusting apparatus 200 is different and the following processing is executed by this program.

That is, in the sixth embodiment, since the shift amount for correcting the measured value of the laser power is a constant value, it may not be possible to correct it depending on the temperature characteristic of each LD 101, and it is suitable for all adjusted machines. It cannot be said that the laser power can be adjusted.

Therefore, in this embodiment, the laser power of the LD 101 is adjusted by the processing shown in FIG. As shown in FIG. 12, steps S140 to S1
47 is the same as steps S101 to S108 in the process of FIG. 10 according to the sixth embodiment.
Since 149 and S150 are the same as steps S114 and S115, detailed description thereof will be omitted.

In this processing, the temperature characteristic correction laser power shift amount corresponding to Pow_Diff calculated in step S147 is calculated (step S148). In this case, Pow_
The relationship between Diff and the temperature characteristic correction laser power shift amount is derived in advance. The derivation method is, in the adjusted optical recording system of the sixth embodiment, calculated from the laser power at the time of Pow_Diff acquired at the beginning of the adjustment and the laser power at the time when Pow_Diff converges, for example, the relational expression shown in the first embodiment It is derived using the procedure. Then, the obtained temperature characteristic correction laser power shift amount is added to the measured value of the laser power in steps S123 and S130 in the process shown in FIG. The value calculating means is realized by step S148.

By performing such processing, the number of adjustment steps is small, and appropriate laser power adjustment can be performed corresponding to the temperature characteristics of each LD 101.

In each of the embodiments described above, the optical disc drive 100 is provided with the power meter 201 provided in the optical disc drive 100, and the CPU 103 executes the laser power adjustment process described as being performed by the personal computer 300. The laser power adjusting device 200 may also function as the device.

[0126]

According to the first aspect of the invention, the relationship between the light quantity of the light source and the set value of the light output is automatically obtained, and the data of the relational expression is set in the optical recording medium drive device so that the light source Since the output level can be adjusted appropriately, work efficiency is high and various light output settings can be appropriately performed.

According to the invention described in claim 2, in the light quantity adjusting device according to claim 1, the characteristics of the light source can be more accurately expressed by a relational expression, and the output level of the light source can be set appropriately. .

The invention described in claim 3 is the invention according to claim 1 or 2.
The same operation and effect as the invention described in (1) are achieved.

According to a fourth aspect of the invention, in the light quantity adjusting device according to any one of the first to third aspects, even when the light output of the light source is monitored and the light output of the light source is corrected, The light output of the light source can be adjusted appropriately.

According to a fifth aspect of the present invention, in the optical recording system according to the fourth aspect, the optical output of the light source is appropriately adjusted for various optical recording medium drive devices by removing the offset on the circuit. be able to.

The invention according to claim 6 is the invention according to claim 4 or 5.
In the optical recording system described in (3), since the abnormality of the set value of the light output of the light source is detected and the light emission is blocked or suppressed, the light source can be prevented from being destroyed.

According to the invention described in claim 7, in the optical recording system according to any one of claims 4 to 6, the optical output can be adjusted according to the temperature characteristic of the light source.

The invention described in claim 8 is the optical recording system according to claim 7, which is capable of detecting an abnormality in the measured value of the light amount of the light source, an abnormality in the external temperature, and the like, and which corresponds to the temperature characteristic of the light source. The light output can be adjusted.

The invention according to claim 9 is the invention according to claim 7 or 8.
In the optical recording system described in (1), it is possible to reduce the adjustment man-hours for adjusting the light output of the light source while corresponding to the temperature characteristics of the light source.

According to a tenth aspect of the invention, in the optical recording system according to the ninth aspect, the light output of the light source can be adjusted corresponding to the temperature characteristics of the light source in each device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical recording system according to a first embodiment of the invention.

FIG. 2 is a flowchart of a process performed by a laser power adjusting device of the optical recording system.

FIG. 3 is the same flowchart.

FIG. 4 is a block diagram showing a configuration of an optical recording system according to a second embodiment of the invention.

FIG. 5 is a flowchart of a process performed by a laser power adjusting device of the optical recording system.

FIG. 6 is a block diagram showing a configuration of an optical recording system according to a second embodiment of the invention.

FIG. 7 is a flowchart of a process performed by a laser power adjusting device of an optical recording system according to a third embodiment of the invention.

FIG. 8 is a block diagram showing a configuration of the optical recording system.

FIG. 9 is a flowchart of a process performed by the laser power adjusting device of the optical recording system according to the fourth embodiment of the invention.

FIG. 10 is a flowchart of processing performed by a laser power adjustment device of an optical recording system that is Embodiment 5 of the present invention.

FIG. 11 is a flowchart of a process performed by a laser power adjusting device of an optical recording system according to a sixth embodiment of the invention.

FIG. 12 is a flowchart of processing performed by a laser power adjusting device of an optical recording system that is Embodiment 7 of the present invention.

[Explanation of symbols]

100 optical recording medium drive device 101 light source 108 Light receiving element 119 Safety retention means 200 Light intensity adjustment device 201 Light intensity sensor

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D090 AA01 BB04 CC01 CC04 CC16                       CC18 EE01 EE05 FF21 HH01                       JJ00 KK03 LL08                 5D119 AA10 AA11 AA22 BA01 BB03                       DA01 DA05 DA07 HA12 HA36                       HA68                 5D789 AA10 AA11 AA22 BA01 BB03                       DA01 DA05 DA07 HA12 HA36                       HA68

Claims (10)

[Claims] 1. An optical recording medium drive device for irradiating light from a light source to perform at least one process of reading, writing, and erasing information on an optical recording medium, and setting an optical output of the light source to a predetermined value. Then, the light emitting means for emitting the light source at the set value, the light amount detection sensor for detecting the light emission, and the relational expression calculating means for calculating the relational expression between the detected light amount and the set value are obtained. First setting means for setting data relating to the relational expression in the optical recording medium drive device; emission of the light source by the light emitting means and detection by the light amount detection sensor; calculation by the calculating means; and first setting means Execution means for sequentially executing the setting by
A light quantity adjusting device. 2. The relational expression calculating means calculates the relational expression as 2
The light amount adjusting device according to claim 1, wherein the light amount adjusting device is calculated as the following equation or using least square regression. 3. An optical recording medium drive device for irradiating light from a light source to perform at least one process of reading, writing and erasing information on an optical recording medium, and the light amount adjusting device according to claim 1 or 2. And an optical recording system comprising. 4. The optical recording medium drive device comprises a correcting means for monitoring the optical output of the light source and correcting the optical output of the light source, and a stopping means for stopping at least during execution of processing by the executing means. The light amount adjusting device according to claim 1, further comprising: 5. A light receiving element for receiving the reflected light from the optical recording medium by the light irradiation, a comparing means for comparing the output of the light receiving element with a constant reference value, and comparing the light according to the comparison. Adjusting means for adjusting the offset of the circuit of the recording medium drive device, wherein the executing means emits the light from the light source by the light emitting means and detects by the light amount detecting sensor after the adjustment by the adjusting means, and the relational expression calculating means. 5. The optical recording system according to claim 4, wherein the calculation by the above and the setting by the first setting unit are sequentially executed. 6. The optical recording system according to claim 4, further comprising a safety holding unit that blocks or suppresses the light emission when the set value set by the light emitting unit is a predetermined abnormal value. 7. A shake width calculating means for calculating a shake width of the detected light quantity from a plurality of detection values by the light quantity detecting sensor, a comparing means for comparing the shake width with a predetermined value, and the shake width calculating means. Computation performed by replacing the detected value by a new one and comparison by the comparison means, and a repeating means for repeating a predetermined number of times until the shake width falls below the predetermined value as a result of the comparison, the execution means: When the shake width is below the predetermined value as a result of the comparison, the light emission of the light source by the light emitting means and the detection by the light amount detection sensor, the calculation by the relational expression calculating means, and the setting by the first setting means are performed. The optical recording system according to any one of claims 4 to 6, wherein the optical recording system is sequentially executed. 8. The optical recording system according to claim 7, further comprising an abnormality determination unit that determines that an abnormality has occurred when the number of repetitions by the repeating unit reaches the predetermined number of times. 9. A value adjusting means for adjusting a value of the light quantity detected by the light quantity detecting sensor by adding a predetermined value, wherein the relational expression calculating means has a value after the adjustment and a value set by the light emitting means. 8. A relational expression with is calculated.
Or the optical recording system according to item 8. 10. The optical recording system according to claim 9, further comprising a value calculating means for deriving a predetermined value to be added to the light quantity value by the value adjusting means according to a change in the light quantity of the light source due to a temperature characteristic.