JPH0676305A - Adjusting method for mounting position of optical detecting element for optical recording device and its device - Google Patents

Abstract

PURPOSE:To rapidly and automatically perform position adjusting when an optical detecting element is mounted on a mounted member, in a manufacturing process of an optical recording device. CONSTITUTION:Optical detecting elements 15a-d for servo control and plural optical detecting elements 15e-p for tracking which are arranged opposing to the above elements spacing a gap of the same value as a diameter of a light beam used for the initial position adjusting are used. Eccentricity for the light beam of the optical detecting elements 15a-d for servo control is calculated from measured values of output signals of the optical detecting elements 15e-p for tracking, and optical detecting elements 15 are moved in the direction of decreasing this eccentricity. Further, the above-mentioned each optical detecting elements 15 and the light beam are two-dimensionally and relatively moved, a deviation of a center position of the optical detecting elements 15a-d for servo control for a light axis of the light beam can be detected from reading of measured values of the optical detecting elements 15e-p for tracking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the position when fixing a laser beam detecting means on a mounting member in the manufacture of a storage device using an optical storage medium, particularly an optical disk.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and device for adjusting the position of attaching a photodetector for an optical recording device.

[0002]

2. Description of the Related Art Conventionally, the following is known as a method and apparatus for adjusting the mounting position of a laser light detecting element on a mounting member for positioning with an accuracy of, for example, several μm to several hundreds of μm. Has been. FIG. 16 is a diagram showing an arrangement of light receiving elements on a general laser light detecting element. In FIG. 16, servo control light receiving elements 15a to 15d are light receiving elements that detect the reflected light from the optical storage medium, trace the track on the optical storage medium, and read the recorded signal. The tracking light receiving elements 15e and 15f are light receiving elements provided on the laser light detecting means for adjusting the position when fixing the laser light detecting means on the mounting member.

FIG. 2 is a view showing the arrangement of the laser light detecting element mounting position adjusting device 1. The operation of each part is as follows. The laser beam 26 emitted from the laser beam generator 14 is applied to the optical disc 10 via the half mirror 13 and the objective lens 11. The laser beam 26 is reflected on the optical disk 10, further reflected by the half mirror 13, and guided to the laser light detection element 15. Here, the laser light detecting element 15 is divided as shown in FIG. Here, the light receiving elements 15a to 15d are
The reflected light from the optical disc 10 is detected, and the optical disc 10 is detected.
It is a light receiving element for servo control for reading information written in. The light receiving elements 15e and 15f are tracking light receiving elements used for adjusting the mounting position of the laser light detecting element.

Output signals S15a-from the light receiving elements 15a-f
f is input to the current / voltage conversion circuit (I / V) 17, converted into output signals S15a to f, and input to the oscilloscope 25. The oscilloscope 25 displays the output of I / V 17. X stage 16a and Y stage 16b
Is a conventional laser light detecting element mounting position adjusting device 1
This is a moving device in which the operator who operates the laser light detecting element 15 moves the laser light detecting element 15 in the X-axis and Y-axis directions shown in FIG.

Next, the procedure for adjusting the mounting position of the laser light detecting element will be described. It should be noted that this position adjustment is performed in a state where the tracking servo system is inactivated.

(Rough Adjustment Stage) At this stage, the diameter of the spot 27 of the laser beam 26 on the laser light detecting element 15 is determined by a focus coil (not shown) arranged between the objective lens 11 and the half mirror 13. Is adjusted to about 500 μm. Output signals S15e and S15f of the light receiving elements 15e and 15f are input to the oscilloscope 25 at the X-axis input and the Y-axis input, respectively. The operator
Output signals S15e and S15f of the light receiving elements 15e and 15f
Y stage 16b while observing with the oscilloscope 25
Is operated to search for a position where the output signals S15e and 15f are equal. Here, when the bright spot on the oscilloscope 25 is located at the center of the screen, the output signals S15e, S1
It is determined that the intensities of 5f are equal. With the above rough adjustment, the center of the spot 27 is located substantially on the center line A shown in FIG. In the rough adjustment stage, the Y-axis direction is fixed.

(Fine adjustment stage) At this stage, the spot 27
The diameter of is 100μ by adjusting the focus coil.
It is set to about m. The operator receives the light receiving elements 15a to 15a.
While observing the output signals S15a to S15d of d, the X stage 16a and the Y stage 16b are operated so that the value of the following equation becomes a predetermined value, and the position of the laser light detection element 15 is adjusted.

[Equation 1]

[Equation 2]

[0008]

Since the conventional method and apparatus for adjusting the mounting position of the laser light detecting element are configured as described above, the adjustment range in the X-axis direction is smaller than that in the Y-axis direction (1 In addition, the position of the spot of the laser light on the laser light detecting element at the time of starting the adjustment is required to have a certain accuracy in the Y-axis adjusting step.

Further, in the conventional position adjusting method, measurement, X
Since the operation of the stage and the operation of the Y stage are all performed manually, there is a problem of inefficiency. The present invention has been made in view of the above problems, and it is possible to set a wide adjustment range in the X-axis direction and reduce the accuracy required for the position of the spot when starting the adjustment. Laser that can perform measurement, X stage operation, and Y stage operation automatically, is highly efficient, can shorten adjustment time, and can save manpower and labor for adjustment. An object of the present invention is to provide a method for adjusting the position of attaching a photodetector and a device therefor.

[0010]

In order to achieve the above object, in a laser light detecting element mounting position adjusting method and apparatus according to the present invention, a servo controlling light detecting element and a light beam used for initial position adjustment are provided. Using a plurality of tracking photo-detecting elements arranged facing each other with the photo-detecting element as the center, with a distance about the same as the diameter, from the measured values of the output signals of these tracking photo-detecting elements, It is characterized in that the eccentricity of the servo control photodetection element with respect to the light beam is calculated, and the photodetection element is moved in the direction in which the eccentricity disappears.

Further, a plurality of tracking light beams are arranged facing each other with the servo control photodetection element and the photodetection element at the center with a distance approximately the same as the diameter of the light beam used for initial position adjustment. With a detection element, from the measured value of the output signal of these tracking photo detection elements, calculate the eccentricity of the servo control photo detection element with respect to the light beam,
It is characterized in that it has means for moving the photodetector in the direction in which the eccentricity is eliminated.

Further, a plurality of tracking light beams are arranged facing each other with the photodetection element as the center, with a distance approximately the same as the diameter of the light beam used for the initial position adjustment. The light beam used for position adjustment is two-dimensionally moved relative to the mounting member on which the detection element is arranged, and the servo control for the optical axis of the light beam is performed from the reading of the measurement value of the tracking photo detection element. It is characterized in that the deviation of the center position of the use light detection element is detected.

Further, a plurality of tracking light beams are arranged so as to face each other with the photodetection element for servo control and the diameter of the light beam used for the initial position adjustment at a distance of about the same distance. A means for two-dimensionally moving the light beam used for position adjustment relative to the mounting member on which the detection element is arranged, and reading the measured value of the tracking light detection element with respect to the optical axis of the light beam. It is characterized in that it has means for detecting a shift of the center position of the servo control photodetection element.

[0014]

The servo control photodetector and a plurality of tracking photodetectors arranged facing each other with the photodetector as the center, with a distance approximately the same as the diameter of the light beam used for initial position adjustment. Expands the range of position adjustment and relaxes the accuracy of the initial position of the light beam during position adjustment. Moreover, the eccentricity of the servo control photodetector with respect to the light beam is calculated from the measured values of the output signals of these tracking photodetectors, and the photodetector is moved in the direction in which the eccentricity disappears, so that the servo The center of the light beam is aligned with the control light detection element.

Further, the servo control photodetection element and the photodetection element for the initial position adjustment are arranged to face each other with the same distance as the diameter of the light beam used for the initial position adjustment.
The light beam used for position adjustment is two-dimensionally moved relative to the member provided with the plurality of tracking light detection elements, and the optical axis of the light beam is read from the reading of the measurement value of the tracking light detection element. By detecting the shift of the center position of the servo control photodetection element with respect to, the automation of the position adjustment process is facilitated, and the center of the light beam and the center of the servo control light receiving element are aligned.

[0016]

EXAMPLE A first example will be described. FIG. 1 is a diagram showing the arrangement of the laser light detecting elements on the laser light detecting element 15 of this embodiment. In FIG. 1, the light receiving element 15a
˜d are servo control light receiving elements, light receiving elements 15e, 15f
Is a light receiving element for tracking. The spot 27 is a spot of a laser beam on the laser light detecting element 15.

FIG. 2 is a view showing the configuration of the first photo-detecting element mounting position adjusting apparatus 1 for an optical recording apparatus of this embodiment. In FIG. 2, an optical disc 10 is an optical disc used for adjusting a photodetecting element attachment position for an optical recording device, and the optical disc 10 stores a certain information pattern. The objective lens 11 emits the laser beam 26,
It is a lens that converges on the optical disk 10. The half mirror 13 is a half mirror that allows the laser beam 26 emitted from the laser beam generator 14 to pass in the direction of the objective lens 11 and the optical disc 10, and reflects the laser beam 26 reflected by the optical disc 10 to the laser beam detecting element 15.

The optical pickup unit 3 is an optical pickup unit composed of the parts excluding the optical disk 10 among the above-mentioned parts. Regarding the optical pickup unit 3, parts not related to this embodiment are omitted. The X stage 16a is a moving device that moves the laser light detecting element 15 in the X direction with respect to the mounting member 28, and the Y stage 16b is a moving device that moves the laser light detecting element 15 in the Y direction with respect to the mounting member 28. is there.

The adjusting handles 29a and 29b are manually operated to manually move the X stage 16a and the Y stage 16b, respectively.
It is a handle for adjusting. I / V 17 is an output signal S15 of each light receiving element laser light detecting element 15a to f
This is a circuit for converting currents a to f into voltage. The oscilloscope 25 displays the output signals S15a to f on the screen according to the setting. Alternatively, each of the selected output signals S15a-
Display is performed with f being the X-axis input and the Y-axis input. Alternatively, the display is performed by inputting an arbitrary output signal.

FIG. 3 is a flow chart showing the procedure of adjusting the photodetecting element mounting position for the optical recording apparatus according to this embodiment. In FIG. 3, in step 00 (S00), the operator observes the sum signal of the output signals S15e and S15f of the laser light receiving elements 15e and 15f arranged facing each other on the oscilloscope 25, and the predetermined threshold is obtained. It is determined whether the value is A or more. This sum signal is the threshold A
When it is larger than the threshold value, the process proceeds to S02, and when it is smaller than the threshold value A, the process proceeds to S01.

In step 01 (S01), the operator uses the adjusting handle 29b to adjust the Y stage 16b, and then proceeds to step S00. Here, the adjustment handle 29a is not used and the X stage 16a is fixed. In step 02 (S02), the operator uses the adjustment handle 29a to adjust the X stage 16a. Here, the adjustment handle 29b is not used and the Y stage 16b is fixed.

In step 03 (S03), the operator operates the oscilloscope 25 to output the output signal S15 of the laser light receiving elements 15e and 15f arranged facing each other.
By observing e and 15f, it is judged whether or not the intensities of both are equal. If the two intensities are equal, the process proceeds to S04, and if they are not equal, the process proceeds to S02. Step 0
In 4 (S04), the operator finely adjusts the values x and y in (Equation 1) and (Equation 2) to be predetermined values.

After the adjustments performed as described above, the tracking servo system is activated, and more precise adjustments are performed so that the spots 27 are accurately irradiated to the centers of the light receiving elements 15a to 15d in the normal operation mode. .

The second embodiment will be described below. FIG. 4 is a diagram showing an array of light receiving elements on the first laser light detecting element 15. In FIG. 4, light receiving elements 15g and 15h are auxiliary tracking light receiving elements. The other parts are the same as in the first embodiment. The position adjusting method of the laser light detecting element 15 of the present embodiment is realized in the first light detecting element mounting position adjusting device for an optical recording apparatus 1 shown in FIG.

FIG. 5 is a flow chart showing the procedure of the method of adjusting the photodetecting element mounting position for the optical recording apparatus of the second embodiment. In FIG. 5, step 10 (S10)
In, the operator observes the output signals S15e to S15h of the respective light receiving elements 15e to 15h on the oscilloscope 25. In step 11 (S11), the operator uses the oscilloscope 25 to output the output signals S15e of the light receiving elements 15e to 15h.
~ H is observed, X stage 16a and Y stage 16
The laser beam detecting element 15 is moved by operating b, and the output signals S15e, S15f and S15g and S15h are adjusted to have the same values.

Further, the light receiving element 1 is
The operator observes the sum signals of 5a to 5d, and the operator operates the X stage 16a.
Is operated to move the laser light detecting element 15 to a position where the sum signal of the light receiving elements 15a to 15d shows the highest value. According to the second embodiment, the photodetection elements 15a to 15d are disposed above and below the photodetection elements 15a to 15d.
f, RF signal light receiving elements 15g to h are arranged on the left and right,
The position can be adjusted by two-step adjustment operation. After the adjustments performed as described above, more precise adjustments are performed so that the spots 27 are accurately applied to the centers of the light receiving elements 15a to 15d, as described above.

The third embodiment will be described below. FIG. 6 shows a second photo-detecting element mounting position adjusting device 2 for an optical recording device, which realizes a photo-detecting element mounting position adjusting method for an optical recording device of the third embodiment. In FIG.
The focus coil 12 is an objective lens 11 moving device that periodically moves the objective lens 11 up and down to change the diameter of the spot 27 on the laser light detection element 15 and to change the energy density of the laser beam 26 inside the spot 27. The I / V 17 is composed of an I / V 17a and an adder circuit 17b, and outputs the output signals s15a ...
This is an I / V conversion circuit that calculates the sum signal of the d output and performs I / V conversion. The configuration of the I / V 17 is shown in FIG. The swing circuit 18 is a focus coil control circuit that controls the focus coil 12 in accordance with the swing signal output from the timing pulse generation circuit 23.

The sample and hold circuit 19 is composed of two sample and hold circuits 19a and 19b. The sample and hold circuits 19a and 19b respectively output the I / V 17 input while the high active sample and hold signal is 0. The sample-hold circuit holds the maximum value of the signal S17 until the reset signal becomes 1 next time. The configuration of the sample hold circuit 19 is shown in FIG.
The pulse motor controllers 20 and 21 include a control unit 24.
The pulse motors 31a and 31b are controlled in accordance with the control of the X stage 16a and the Y stage 16b, respectively.
To control.

The A / D converter 22 selects the output signals of the sample and hold circuits 19a and 19b according to the multiplexer signal, and performs analog / digital (A / D) conversion according to the start signal output from the timing pulse generation circuit 23, It is an A / D conversion circuit that outputs to the control unit 24. The timing pulse generation circuit 23 includes a control unit 2
4 is a timing pulse generation circuit that generates the swing signal, the start signal, and the sample hold signal under the control of 4. The control unit 24 is a digital computer that calculates the output signal of the A / D converter 22 and controls the timing pulse generation circuit 23 and the pulse motor controllers 20 and 21. The control unit bus 30 is a bus that connects the control unit 24 and each unit. In this embodiment, it is assumed that the light receiving elements 15a to 15d are arranged on the laser light detecting element 15 as shown in FIG. Pulse motors 31a, 31
Reference numeral b is a pulse motor that drives the X stage 16a and the Y stage 16b.

FIG. 7 is an external view of a photo-detecting element mounting position adjusting device for an optical recording apparatus to which the present invention is applied.
The photo-detecting element mounting position adjusting device for the optical recording device shown in FIG. 7 includes a bit driving pulse motor 100 and a potentiometer 1.
01, coupling 102, thrust relief joint 1
03, bowl slide 104, driver unit vertical movement plate 105, individual vertical movement cylinder 1 for each bit
06, device loading place 107, ACU 108, device reference axis clamp claw 109, removable table 110, frame cover attachment 111, timing belt 11
2, pressure spring 113, thrust seat 114, coupling 115, adjustment plate 116, potentiometer 117, balancing spring 118, photodetector (PD) clamp 119, PD retainer 120, turntable 121, standard base 122, electrical equipment It is composed of a panel 123, a first pulse motor 31a, a second pulse motor 31b, and an air device mounting panel 124. The optical pickup unit 3 is fixed by a PD clamp 119 and a PD 120 holder.

Next, the operation will be described. Hereinafter, the procedure of the adjustment (beam search) step of aligning the spot 27 on the light receiving elements 15a to 15d will be described. Swing circuit 1
Reference numeral 8 controls the focus coil 12 according to the swing signal output from the timing pulse generation circuit 23, and moves the objective lens 11 up and down by a constant distance at a frequency of about 15 to 20 times per second. On the other hand, the control unit 24 controls the pulse motor controllers 20 and 21, and controls the pulse motors 31a and 3a.
1b through X stage 16a and Y stage 16b
Is operated to move the laser light detection element 15 on the mounting member 28 at a speed of about 4 mm per second along the locus shown in FIG.

A start signal input to the A / D converter 22, a swing signal S12 input to the focus coil 12, a start signal input to the A / D converter 22, and samples input to the sample hold circuits 19a and 19b, respectively. Hold signals a and b, and output signals S19a of the sample hold circuits 19a and 19b,
FIG. 12 shows the sum signal output of the output signals of 19b and the light receiving elements 15a to 15d. In FIG. 12, the swing signal level is
It corresponds to the position of the objective lens 11. When the gate signal is 1, the A / D converter 22 outputs the output of the sample hold circuit 19b, and when the gate signal is 0, the sample hold circuit 19a.
The output of is to be A / D converted.

The above-mentioned signals are shown in FIG.
Input / output is performed in the relationship as shown in 2. When the sample and hold signals a and b become 1, the sample and hold circuit 19
signals S19a and 1 held in a and 19b, respectively.
9b is cleared, then the sample / hold signals a and b become 1 and hold the highest values of the I / V 17a and 17b output signals S17a and 17b until they become 0 again. Signal S19
The signals a and 19b are input to the A / D converter 22, and the signals S19a and 19b at the time when the start signal becomes 1 are converted into digital signals and output to the control unit 24.

The control section 24 compares the values of the signals S19a and 19b with a preset threshold value, and compares them with S19a and 19b.
When either of b exceeds the threshold value, the pulse motor controllers 20 and 21 are controlled to stop the movement of the spot 27 on the laser light detection element 15. here,
Since the signals S19a and 19b are based on the output signals S15a to S15d output from the I / V 17 before the start signal at the above-mentioned time point, the trajectory shown in FIG. 11 is moved backward by 100 μm. This retreat distance is obtained from the vertical cycle of the objective lens 11 and the speed of movement along the locus of FIG. This completes the adjustment of the beam search stage.

FIG. 13 summarizes the adjustment procedure of the above beam search steps. FIG. 13 is a flowchart showing the procedure of adjustment in the beam search stage. 13, in step 20 (S20), the control unit 24 controls each of the above parts to move the objective lens 11 up and down, and move the spot 27 on the laser light detecting element 15 on the locus shown in FIG. To start. At the same time, the sample hold circuit 19 and the A / D converter 22 start measuring the sum signal. In step 21 (S21), the controller 24 outputs the signal S22 every half cycle of the vertical movement of the objective lens 11.
Is compared with the threshold value, and if the value of the signal S22 is less than the threshold value, the process of S21 is continued again, and if the value of the signal S22 is less than the threshold value, the process proceeds to S23. In step 22 (S22), the control unit 24 controls the above-mentioned respective parts and ends the vertical movement of the objective lens 11 and the movement on the locus shown in FIG. In step 23 (S23),
The control unit 24 returns the position of the spot 27 by 100 μm.

Next, the center of the spot 27 and the light receiving element 1
Adjustment at the stage of centering (centering) 5a to 5d will be described. A description of the relationship between the start signal, swing signal, sample hold signal and each output signal at this stage is omitted. At this stage, the objective lens 11 is not moved up and down, the servo operation enabled by the adjustment described above is performed, and the diameter of the spot 27 is set to about 100 μm. In the method of adjusting the photodetecting element mounting position for the optical recording apparatus of this embodiment, the eccentricity amount (x) on the X axis and the eccentricity amount (y) on the Y axis are defined by (Equation 1) and (Equation 2). To be done. However, the unit of the output signals S15a to S15 is voltage (V) and the unit of the eccentricity is μm. Based on the output value of the A / D converter 22, the control unit 24 updates S1 at any time.
5a to 5d are measured, and calculations for obtaining the above x and y are performed. When the calculation of x and y is completed, the pulse motor controllers 20 and 21 are controlled to move the spot 27 on the laser light detection element 15 in the direction of eliminating the obtained eccentricity.

After that, the control unit 24 keeps the A / D converter 22 until the eccentricity falls within the range of -3 μm to +3 μm.
The measurement of S15a to d is performed based on the output value, the calculation for obtaining the above x and y is performed, and the spot 27 on the laser light detection element 15 is moved in the direction of eliminating the obtained eccentricity. When the amount of eccentricity falls within the range of −3 μm to +3 μm, the adjustment ends. After the adjustment performed as described above, as described above, more precise adjustment is performed so that the spot 27 is accurately irradiated to the centers of the light receiving elements 15a to 15d.

The procedure of adjustment in the centering stage described above is summarized in FIG. FIG. 14 is a flowchart showing the procedure of adjustment in the centering stage. Step 30 (S3
In 0), the control unit 24 measures the signals S15a to S15d at any time based on the output value of the A / D converter 22, and performs the calculation for obtaining the above x and y. Step 31 (S3
In 1), x and y obtained above are −3 μm.
If it is outside the range of +3 μm, the process proceeds to S32. If it is within the range of the above value, the process proceeds to S33. Step 32 (S32)
In, the control unit 24 controls the pulse motor controllers 20 and 21 to move the spot 27 on the laser light detection element 15 in the direction of eliminating the obtained eccentricity, and the process proceeds to S30 again. In step 33 (S33), the control unit 24 ends the adjustment.

The fourth embodiment will be described below. The photodetector mounting position adjusting method for the optical recording device of the fourth embodiment is the same as the photodetector mounting position adjusting device 2 for the second optical recording device described in the third embodiment. This is realized in the photodetector mounting position adjusting device 3 for the optical recording device. In this embodiment, the diameter of the spot 27 is first set to about 500 μm. Further, the arrangement of the light receiving elements on the laser light detecting element 15 is as shown in FIG. An apparatus for realizing the photo-detecting element mounting position adjusting method for an optical recording apparatus in the present embodiment is the second photo-detecting element mounting position adjusting apparatus for an optical recording apparatus,

Output signals s15e and 15f of the light receiving elements 15e and 15f shown in FIG. 16 are converted into I / V17 and A / D.
Output signal S15e converted through the converter 22, 1
As 5f, a function to be read by the control unit 24 is added. The operation of each of the other parts is the same as that of the photodetector mounting position adjusting device 2 for the second optical recording device. Similar to the adjustment in the centering stage of the third embodiment, the description of the relationship between the signals will be omitted.

First, the controller 24 outputs the output signals S15e, 1
5f is measured and the pulse motor controllers 20 and 21 are controlled until the two values become equal, and the X stage 16a
And the Y stage 16b, the laser light detecting element 1
5 to move the laser light detecting element 15 of the spot 27.
Move the position above. When the output signals S15e and 15f become equal, the control unit 24 ends the above movement and performs the beam search step and the centering step by the photodetector mounting position adjusting method for the optical recording apparatus described in the third embodiment. Make adjustments. After the adjustment performed as described above, as described above, more precise adjustment is performed so that the spot 27 is accurately irradiated to the centers of the light receiving elements 15a to 15d.

The procedure of the method of adjusting the photodetecting element mounting position for the optical recording apparatus of the present embodiment described above is summarized in FIG. FIG. 15 is a flow chart showing the procedure of the method for adjusting the photodetecting element mounting position for the optical recording apparatus of this embodiment. In FIG. 15, in step 40 (S40), the control unit 24 measures the output signals S15e and 15f. In step 41 (S41), the output signal S15
The values of e and 15f are compared, and if they match, the process proceeds to S43. If they do not match, the process proceeds to S42. Step 42
In (S42), the control unit 24 controls the pulse motor controllers 20 and 21 to move the laser light detection element 15 by the X stage 16a and the Y stage 16b and move the position of the spot 27 on the laser light detection element 15. To do. After this operation ends, the process proceeds to S40. In step 43 (S43), the method for adjusting the photodetecting element mounting position for the optical recording device shown in the third embodiment is performed.

In addition to the above description, the light-receiving element mounting position adjusting method and apparatus of the present invention can have various configurations. The embodiments described herein are exemplary. In particular, those that can be used in combination in the above-described embodiments may be combined and implemented.

Further, in the light receiving element mounting position adjusting method described in the first and second embodiments, the operation performed by the operator is the light receiving for controlling by the digital computer described in the third embodiment. You may implement | achieve in an element attachment position adjusting device. Further, in this embodiment, a device using a pulse motor is used as the moving means of the laser light detecting element 15, but a moving means of the laser light detecting element using a piezo piezoelectric element or the like may be used.

[0045]

As described above, according to the light receiving element mounting position adjusting method and apparatus of the present invention, the range of position adjustment is wide, the accuracy of the initial position of the light beam at the time of position adjustment is relaxed, and the position is improved. In the initial stage of adjustment, the diameter of the light beam used can be increased, and the position adjustment time can be shortened. Further, it is possible to surely align the center of the light beam with the servo control photodetection element.

Further, the process of position adjustment can be easily automated, and the position of the center of the light beam and the center of the light receiving element for servo control can be accurately aligned in a short time. A mounting position adjusting method and its device can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of laser light detection elements on a laser light detection element of the present invention.

FIG. 2 is a diagram showing a configuration of a first laser light detecting element mounting position adjusting device applied to the present invention.

FIG. 3 is a flowchart showing a procedure for adjusting a light-receiving element mounting position according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an arrangement of light receiving elements on a first laser light detecting element of the present invention.

FIG. 5 is a flowchart showing a procedure of a light receiving element mounting position adjusting method according to a second embodiment of the present invention.

FIG. 6 is a second light receiving element mounting position adjusting device of the present invention.

FIG. 7 is an external view of a light-receiving element mounting position adjusting device to which the present invention is applied.

FIG. 8 is a diagram showing a configuration of an I / V conversion circuit in a second light receiving element mounting position adjusting device of the present invention.

FIG. 9 is a diagram showing a configuration of a sample hold circuit in the second light-receiving element mounting position adjusting device of the present invention.

FIG. 10 is a view showing an arrangement of light receiving elements on the second laser light detecting element of the present invention.

FIG. 11 is a diagram showing a locus of a spot of a laser beam on a laser light detecting element in a third embodiment of the present invention.

FIG. 12 is a diagram showing a relationship between signals in a third embodiment of the present invention.

FIG. 13 is a flowchart showing a procedure of adjusting a beam search stage in the third embodiment of the present invention.

FIG. 14 is a flow chart showing the procedure of adjustment in the centering step in the third embodiment of the present invention.

FIG. 15 is a flow chart showing the procedure of a light receiving element attachment position adjusting method in the third embodiment of the present invention.

FIG. 16 is a diagram showing an arrangement of light receiving elements on a laser light detecting element according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 ... First light receiving element mounting position adjusting device 2 ... Second light receiving element mounting position adjusting device 3 ... Optical pickup unit 10 ... Optical disk 11 ... Objective lens 12 ... Focus coil 13 ... Half mirror 14 ... Laser light generator 15 ... Laser light detecting element 15a-h ... Light receiving element 16a ... X stage 16b ... Y stage 17a ... I / V conversion Circuit 17b ... Adding circuit 18 ... Swing circuit 19 ... Sample hold circuit 20 ... First pulse motor controller 21 ... Second pulse motor controller 22 ... A / D converter 23. ..Timing pulse generation circuit 24 ... Control unit 26 ... Laser beam 27 ... Spot 28 ... Member 29 ... Adjustment Use the handle 30 ... control unit bus 31 ... pulse motor

Claims (10)

[Claims] 1. A plurality of tracking light beams, which are arranged to face each other with the photodetection device as a center, with a distance about the same as the diameter of a light beam used for adjusting an initial position. Using the detection element, calculate the eccentricity of the servo control photodetection element with respect to the light beam from the measured values of the output signals of these tracking photodetection elements, and move the photodetection element in the direction in which this eccentricity disappears. A method for adjusting a photodetection element mounting position for an optical recording device, comprising: 2. A plurality of tracking light beams, which are arranged to face each other with the photodetection device as a center, with a distance about the same as the diameter of a light beam used for adjusting the initial position separated from the servo control photodetection device. It has a detection element, calculates the eccentricity of the servo control photodetection element with respect to the light beam from the measured values of the output signals of these tracking photodetection elements, and moves the photodetection element in the direction in which this eccentricity disappears. An optical recording device mounting position adjusting device for an optical recording device, comprising: 3. The method for adjusting the photodetecting element mounting position for an optical recording apparatus according to claim 1, wherein at least two tracking photodetecting elements and at least two RF signal photodetecting elements are provided on the photodetecting means. It arranges, irradiates the light beam on the detection means, and adjusts the mounting position of the light beam detection means to the mounting member two-dimensionally based on the output signal information of the tracking light detection element. A method for adjusting the mounting position of a photodetector for an optical recording device. 4. The photodetecting element mounting position adjusting device for an optical recording apparatus according to claim 2, wherein at least two tracking photodetecting elements and at least two RF signal photodetecting elements are provided on the photodetecting means. And a means for irradiating the detecting means with a light beam and for adjusting the mounting position of the light beam detecting means to the mounting member two-dimensionally based on the output signal information of the tracking light detecting element. An optical recording device mounting position adjusting device for an optical recording device, comprising: 5. A plurality of tracking light beams, which are arranged to face each other with the photodetection device as the center, with a distance about the same as the diameter of the light beam used for the initial position adjustment. The light beam used for position adjustment is moved two-dimensionally relative to the member on which the detection element is arranged, and the servo control light for the optical axis of the light beam is read from the reading of the measurement value of the tracking light detection element. A method for adjusting the position of attaching a photo-detecting element for an optical recording device, which comprises detecting a shift in the center position of the detecting element. 6. A plurality of tracking light beams, which are arranged to face each other with the photodetection device as a center, with a distance approximately the same as the diameter of a light beam used for initial position adjustment. A means for two-dimensionally moving the light beam used for position adjustment relative to the member on which the detection element is arranged, and servo control for the optical axis of the light beam from reading the measurement value of the tracking photo detection element An optical recording device mounting position adjusting device for an optical recording device, comprising means for detecting a shift in the center position of the optical detecting device for use. 7. The method for adjusting the position of a photo-detecting element for an optical recording device according to claim 5, wherein at least two tracking photo-detecting elements are arranged adjacent to the photo-detecting element, and a beam is provided on the detecting means. Light is emitted while moving the irradiation position two-dimensionally, and the position of the beam light detecting means is two-dimensionally moved and adjusted based on the change of the output signal information of the tracking photo-detecting element, and Based on the change in the output signal information of the photodetector,
A method for adjusting a photodetection element mounting position for an optical recording apparatus, which comprises two-dimensionally adjusting a mounting position of the above-mentioned beam light detecting means on a mounting member. 8. A photo-detecting element mounting position adjusting device for an optical recording apparatus according to claim 6, further comprising at least two tracking photo-detecting elements adjacent to the photo-detecting element, and a beam on the detecting means. Light, having a means for irradiating while moving the irradiation position two-dimensionally, based on the change of the output signal information of the tracking photodetection element, the position of the beam light detection means is two-dimensionally moved, Adjusting means, further based on the change of the output signal information of the photodetector,
A photo-detecting element mounting position adjusting device for an optical recording apparatus, which has a unit for two-dimensionally adjusting a mounting position of the beam light detecting unit to a mounting member. 9. The method for adjusting the photodetecting element mounting position for an optical recording apparatus according to claim 5, wherein at least two tracking photodetecting elements and at least two RF signal photodetecting elements are arranged on the photodetecting means. Then, the detection means is irradiated with light beam, and the mounting position of the light beam detection means to the mounting member is two-dimensionally adjusted based on the output signal information of the tracking light detection element. A method for adjusting the mounting position of a photodetector for an optical recording device. 10. The photo-detecting element mounting position adjusting device for an optical recording apparatus according to claim 6, wherein at least two tracking photo-detecting elements and at least two RF signal photo-detecting elements are provided on the photo-detecting means. A means for irradiating the detecting means with a light beam, and two-dimensionally adjusting the mounting position of the light beam detecting means to the mounting member based on the output signal information of the tracking light detecting element. A photo-detecting element mounting position adjusting device for an optical recording device.