JP3699282B2 - Adjusting method of integrated optical head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an integrated optical head used in an optical disk apparatus.CollectionHow to adjust the stacked optical headTo the lawIn particular, it achieves high-precision adjustment while reducing the adjustment load of the integrated optical head.CollectionHow to adjust the stacked optical headTo the lawRelated.
[0002]
With the recent increase in the speed of computer systems and the rapid increase in data volume, the role of auxiliary storage devices is required to be capable of high-speed and large-capacity recording / reproduction. For this reason, the demand for optical information recording / reproducing apparatuses such as CD-ROMs and optical discs is increasing year by year, and it is expected that they will shift to cheaper, smaller and larger capacity models in the future.
[0003]
In order to realize this small size and large capacity, the development of high-density recording media and short-wavelength emission lasers is underway. To achieve downsizing of the entire device, a highly reliable compact size is required. It is necessary to develop an optical head, and it is necessary to establish an adjustment technology for this small optical head.
[0004]
[Prior art]
In an optical disk apparatus, in addition to a reproduction detector, a focusing detector (hereinafter referred to as an FES detector) used to control the laser beam to be focused on the optical disk, and the laser beam follow the track of the optical disk. A tracking detector (hereinafter referred to as a TES detector) that is used to perform control.
[0005]
For example, as shown in FIG. 14, this FES detector is composed of a four-part photosensor (A / B / C / D), and a converging spherical lens and an optical path of reflected light separated by a beam splitter. Used when an optical system that inserts a cylindrical lens to generate astigmatism with different laser beam convergence positions in the vertical and horizontal directions, and the shape of the convergent light changes vertically or horizontally This is used to detect a focus error.
[0006]
On the other hand, for example, as shown in FIG. 15, the TES detector is composed of a two-part photosensor (A / B), and when the position of the laser beam coincides with the track, the reflected light from the optical disc is equal on the left and right. In contrast to the intensity distribution, the tracking error is detected by utilizing the fact that the right and left intensity distributions become asymmetric when the positional relationship is shifted.
[0007]
The focus error signal output from the FES detector and the track error signal output from the TES detector have a signal form as shown in FIG. 16, and the laser beam is focused, and the positions of the laser beam and the track are as follows. Is coincident with the α point (the point where the focus error signal is 0V) in the figure and the β point (the point where the amplitude of the track error signal is maximized) in the figure, and the track error It shows the characteristic that the average value of the positive and negative maximum output values of the signal indicates 0V.
[0008]
Thus, conventionally, when the coarse adjustment of the optical disk device is completed, a configuration is adopted in which the focus error signal and the track error signal are collected while rotating the optical disk. In order to be in the state, a method of finely adjusting the mounting position of the FES detector, the TES detector, the hologram constituting the optical system, and the like has been adopted.
[0009]
[Problems to be solved by the invention]
However, according to such a conventional technique, since the focus error signal and the track error signal are collected while rotating the optical disc, the focus error signal and the track error signal are not stable, and thus the FES detector and There was a problem that it was difficult to finely adjust the mounting position of the TES detector or hologram.
[0010]
That is, according to such a conventional technique, the FES detector, the TES detector, the hologram, etc. are finely adjusted so that the relationship established between the two signals of the focus error signal and the track error signal becomes a specified one. Since the focus error signal and the track error signal are not stable, the adjustment is difficult.
[0011]
In order to solve this problem, a method of collecting a focus error signal and a track error signal by using a pseudo optical system using an oscillating medium piece that simulates an optical disk can be adopted.
[0012]
Certainly, this method makes it possible to collect more stable focus error signal and track error signal than actually rotating the optical disc, and FES detector, TES detector, hologram, etc. However, the focus error signal and track error signal collected during adjustment are different from those actually used. There is a possibility that things that are not adjusted will happen.
[0013]
  The present invention has been made in view of such circumstances,When assembling the integrated optical head,New to achieve high-precision adjustment while reducing adjustment loadTechnicalFor the purpose of provision.
[0014]
[Means for Solving the Problems]
  In the present invention, a light emitting element, a focus light receiving element that generates a focus error signal, a track light receiving element that generates a track error signal, and a reproduction light receiving element that generates a reproduction signal are integrated in a stem. The cap of the integrated module is irradiated with the light emitted from the light emitting element onto the optical disk medium, and the light reflected from the optical disk medium is split in accordance with the irradiation, and one of the lights is incident on the reproducing light receiving element. Integrated light configured by mounting a first optical element and a second optical element on which the other light split by the first optical element is incident on the focus light receiving element and the track light receiving element Adjust the head.
  With the integrated optical head configured as described above as an adjustment target, in the present invention, (a) applying a focus servo using a focus error signal generated by the focus light-receiving element before attaching the first optical element. Collecting the track error signal generated by the light receiving element for the track and adjusting the mounting position of the second optical element so that the amplitude of the track error signal collected at that time is maximized; Before mounting the optical element, collect the track error signal generated by the track light receiving element while applying focus servo using the focus error signal generated by the focus light receiving element, and collect the track error signal at that time (C) Before mounting the first optical element, adjust the mounting position of the second optical element so that the center value of all the amplitudes becomes the reference value. The focus error signal generated by the focus light receiving element is collected while releasing the focus servo using the focus error signal generated by the focus light receiving element, and the differential value of the focus error signal collected at that time is maximized. Thus, the mounting position of the second optical element is adjusted.
  (D) After the adjustment of the mounting position of the second optical element is completed, the first optical element is placed at the mounting position, and focus servo is applied using the focus error signal generated by the focus light receiving element. , While collecting the track servo using the track error signal generated by the light receiving element for the track, collecting the reproduction signal generated by the light receiving element for reproduction, so that the amplitude of the reproduction signal collected at that time is maximized, The mounting position of the first optical element is adjusted.
[0017]
  NextNext, a method for adjusting an integrated optical head according to the present invention will be described in detail.
  The present invention, for example, as shown in FIG. 1, a laser diode 10, a servo detector 11 (FES detector / TES detector) prepared for generating a servo error signal (focus error signal / track error signal), A reproduction detector 12 prepared for generating a reproduction signal is integrated in the stem 13, and a hologram 15 for diffracting the light reflected from the optical disk and irradiating the servo detector 11 on the cap 14 of the integrated module; The laser beam emitted from the laser diode 10 is irradiated onto the optical disk, the light reflected from the optical disk is split, one split light is incident on the hologram 15, and the other split light is incident on the reproducing detector 12. The integrated optical head 1 for mounting the composite prism 16 is adjusted. As the target, in the next processing steps to adjust the mounting position of the hologram 15 and the composite prism 16.
[0018]
  That is, first, the integrated optical head 1 that has been subjected to the rough adjustment without mounting the composite prism 16 in order to adjust the mounting position of the hologram 15 is shown in FIG.In addition, an assembly apparatus for the integrated optical head 1Install.
[0019]
  Here, in FIG.Prepared for adjustmentAn optical disk, 20 is a collimator lens that converts the laser beam emitted from the integrated optical head 1 into parallel light, 21 is an objective lens, and the laser beam converted into parallel light by the collimator lens 20 is converted into the optical disk 100. 2 is a biaxial actuator that moves the position of the objective lens 21, 23 is a servo system circuit that controls the biaxial actuator 22, and 24 is a signal detection circuit. A servo error signal output from the servo detector 11 and a reproduction signal output from the reproduction detector 12; 25 an automatic stage for moving the position of the hologram 15 and the composite prism 16; Is a stage controller that controls the movement of the automatic stage 25, and 27 is a host computer. A chromatography data, and executes the processing procedure of the present invention.
  The biaxial actuator 22 and the servo system circuit 23 constitute a servo mechanism, and this servo mechanism is designed so that the laser beam emitted from the integrated optical head 1 is focused on the optical disk 100 prepared for adjustment. In addition to controlling, the optical disc 100 operates to follow the track of the optical disc 100.
[0020]
When the host computer 27 finely adjusts the mounting position of the hologram 15 of the integrated optical head 1, the focus detected by the signal detection circuit 24 with respect to the servo system circuit 23 when the optical disk 100 is rotating. An instruction is given to apply focus servo using an error signal, and when a focus servo is applied in response to the instruction, a track error signal detected by the signal detection circuit 24 is collected, and the track error collected at that time is collected. By controlling the automatic stage 25 via the stage controller 26 so that the amplitude of the signal is maximized, the mounting position of the hologram 15 is finely adjusted, and the center of the total amplitude of the track error signal collected at that time The automatic stage 25 is controlled via the stage controller 26 so that the value becomes the reference value. By, fine adjustment of the mounting position of the hologram 15.
[0021]
When this adjustment processing is completed, the host computer 27 instructs the servo system circuit 23 to cancel the focus servo, collects the focus error signal detected by the signal detection circuit 24, and collects the focus error signal at that time. The mounting position of the hologram 15 is finely adjusted by controlling the automatic stage 25 via the stage controller 26 so that the differential value of the signal becomes maximum.
[0022]
When the fine adjustment of the mounting position of the hologram 15 is completed, the hologram 15 is mounted using an ultraviolet curable adhesive or the like, and then the composite prism 16 is mounted as shown in FIG. The rough adjustment of the mounting position is performed according to the above.
[0023]
When the coarse adjustment of the mounting position of the composite prism 16 is completed, the host computer 27 uses the focus error signal detected by the signal detection circuit 24 to focus on the servo system circuit 23 while the optical disk 100 is rotating. Instructing to apply the servo and instructing to apply the track servo using the track error signal detected by the signal detection circuit 24. When the focus servo and the track servo are applied in response to the instruction, the signal detection circuit 24. Collecting the reproduction signal detected by 24, and controlling the automatic stage 25 via the stage controller 26 so that the amplitude of the reproduction signal collected at that time is maximized, the mounting position of the composite prism 16 is adjusted. Make fine adjustments.
[0024]
  When the fine adjustment of the mounting position of the composite prism 16 is completed, the composite prism 16 is mounted using an ultraviolet curable adhesive or the like.
  In this way,AkiraServo mechanism that performs focus servo and track servoUse to adjustA configuration that allows fine adjustment of the mounting positions of device components such as the hologram 15 and the composite prism 16 while rotating the optical disc 100 prepared for adjustment.Is takenWhile applying the focus servo, collect the track error signal, finely adjust the mounting position of the device components so that the track error signal collected at that time becomes the specified one, and apply the focus servo and track servo However, since the reproduction signal is collected and the mounting position of the apparatus component is finely adjusted so that the reproduction signal collected at that time becomes a specified one, the apparatus is actually used. By being able to execute the adjustment of the components, it becomes possible to execute a highly accurate adjustment, and it is possible to greatly reduce the load required for the adjustment.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail according to embodiments.
FIG. 4 shows the configuration of an apparatus used for adjusting the integrated optical head 1 shown in FIG. In the figure, the same components as those described in FIG. 2 are indicated by the same symbols.
[0026]
Reference numeral 30 denotes a gripping hand, which is provided on the automatic stage group 25 having X axis / Y axis / Z axis / θ rotation and grips the hologram 15 and the composite prism 16, and 31 is a drive. A spindle motor for rotating the lens, an objective lens 21 with an adjusted optical axis, and a collimator lens 20, 32 is a CCD camera, which is connected to an image processing device (not shown) and recognizes the light emitting point of the laser diode 10 and the like. A processing unit 33 is a single-axis horizontal movement stage that is controlled by the stage controller 26 to exchange the drive 31 and the CCD camera 32, and 34 is an automatic stage group having an X axis / Y axis. Then, the stem 13 of the integrated optical head 1 attached to the jig is moved under the control of the stage controller 26. Reference numeral 35 denotes an air table which moves the automatic stage group 34 on the optical axis of the CCD camera 32. Reference numeral 36 denotes a head amplifier which outputs an output signal from the servo detector 11 and an output signal from the reproduction detector 12. 37 is an AD board which converts a servo error signal and a reproduction signal detected by the signal detection circuit 24 into a digital signal and inputs it to the host computer 27.
[0027]
As the drive 31, it is possible to use an actual device, and in this way, it is possible to completely eliminate the positioning error caused by the individual difference of the drive.
[0028]
The output signal of the servo detector 11 amplified by the head amplifier 36 is converted into a focus error signal and a track error signal by the signal detection circuit 24, and in response to this, the servo system circuit 23 moves the objective lens 21 of the optical disc 100. Servo is applied to follow the medium surface and track groove.
[0029]
The host computer 27 inputs the focus error signal and the track error signal at this time via the AD boat 37 and also inputs the reproduction signal output from the reproduction detector 12 amplified by the head amplifier 36. Further, the host computer 27 recognizes the position of the uniaxial horizontal movement stage 33 through an interface such as GPIB, and obtains a predetermined focus error signal and track error signal so that the uniaxial horizontal movement stage 33 is obtained. It is possible to move.
[0030]
As shown in FIG. 5, the gripping hand 30 has a stationary finger 40 having a V-groove 42 having an opening angle of 90 degrees and a movable finger 41 having a V-groove 43 having an opening angle of 90 degrees. Horizontal abutting portions 44 and 45 are formed at the upper ends of 42 and 43, respectively. The movable finger 41 is held by a linear slide 46 and can be opened and closed by an air cylinder 47. With this structure, the rectangular hologram 15 and the composite prism 16 are held by sandwiching them.
[0031]
When the integrated optical head 1 is adjusted using the apparatus shown in FIG. 4, first, the hologram 15 held by the holding hand 30 is moved on the optical axis of the laser diode 10, and the hologram 15 is moved to the CCD camera. The coarse adjustment is performed by recognizing at 32 and positioning at a predetermined mounting position.
[0032]
When this rough adjustment is completed, a focus error signal and a track error signal having the signal form shown in FIG. 16 are output. Subsequently, the mounting position of the hologram 15 is finely adjusted using the focus error signal and the track error signal.
[0033]
When the fine adjustment of the hologram 15 is completed, the composite prism 16 is subsequently adjusted, the composite prism 16 gripped by the gripping hand 30 is moved onto the optical axis of the laser diode 10, and the composite prism 16 is moved by the CCD camera 32. Recognize and perform coarse adjustment by positioning at a predetermined mounting position.
[0034]
When this rough adjustment is completed, the mounting position of the composite prism 16 is finely adjusted using the focus error signal and the track error signal. When this is finished, the adjustment of the integrated optical head 1 is completed.
[0035]
FIG. 6 and FIG. 7 show an embodiment of a processing procedure executed by the fine adjustment processing execution program developed in the host computer 27 for fine adjustment of the integrated optical head 1. Next, according to this processing procedure, fine adjustment of the integrated optical head 1 according to the present invention will be described in detail.
[0036]
First, the fine adjustment processing of the hologram 15 will be described according to the processing procedure of FIG.
When the operator rotates the optical disc 100 and causes the laser diode 10 to emit light to complete preparations for fine adjustment of the hologram 15, the operator activates a fine adjustment processing execution program developed on the host computer 27. The fine adjustment processing execution program enters the fine adjustment of the mounting position of the hologram 15 and, first, as shown in the processing procedure of FIG. Apply focus servo by instructing.
[0037]
In response to this instruction, the focus servo is applied, so that the objective lens 21 is controlled to be located at a certain distance from the medium surface of the optical disc 100, whereby the focus error signal becomes a reference voltage (for example, 0V). Thus, the focus error signal and the track error signal as shown in FIG. 8 are output.
[0038]
Subsequently, in step 2, the automatic stage group 25 is controlled via the stage controller 26 to move the mounting position of the hologram 15 in the specified direction, and in step 3 the track error signal at that time is collected.
[0039]
Here, the process of moving the attachment position of the hologram 15 performed in step 2 is performed by rotating the hologram 15 in the θ direction (rotation direction with the laser beam as the rotation axis) as shown in FIG.
[0040]
Subsequently, in step 4, it is detected whether or not the amplitude of the track error signal to be collected is maximized, and when it is determined that the amplitude is not maximized, the process returns to step 2 to activate the focus servo. In this state, the mounting position of the hologram 15 that maximizes the track error signal is found.
[0041]
In this manner, the mounting position of the hologram 15 is moved (rotated) in the θ direction, and a position where the amplitude of the track error signal is maximized when the focus servo is applied as shown in FIG. 10 is found. Thus, the attachment position of the hologram 15 in the θ direction is determined.
[0042]
Subsequently, in step 5, the automatic stage group 25 is controlled via the stage controller 26, whereby the mounting position of the hologram 15 is moved in the specified direction. In step 6, the track error signal at that time is collected.
[0043]
Here, the attachment position moving process of the hologram 15 performed in step 5 is performed by moving the hologram 15 in, for example, the X-axis direction (direction from the laser diode 10 toward the servo detector 11) as shown in FIG. . Here, this moving direction depends on the pattern of the servo detector 11.
[0044]
Subsequently, in step 7, it is detected whether or not the central value of all the amplitudes of the collected track error signal has become a reference voltage (for example, 0 V), and when it is determined that the reference voltage is not reached, the process returns to step 5. As a result, the mounting position of the hologram 15 in which the center value of all the amplitudes of the track error signal becomes the reference voltage in a state where the focus servo is applied is searched for.
[0045]
In this way, the mounting position of the hologram 15 is moved in the X-axis direction, and a position where the center value of the amplitude of the track error signal becomes the reference voltage when the focus servo is applied as shown in FIG. By finding it, the mounting position of the hologram 15 in the X-axis direction is determined.
[0046]
Subsequently, in step 8, the focus servo is released by instructing the servo system circuit 23 to release the focus servo. As the focus servo is released, a focus error signal having a signal form as shown in FIG. 16 is output.
[0047]
Subsequently, in step 9, the automatic stage group 25 is controlled via the stage controller 26 to move the mounting position of the hologram 15 in the specified direction, and in step 10, the focus error signal at that time is obtained. The differential value of the focus error signal is collected by calculating the differential value.
[0048]
Here, as shown in FIG. 9, the hologram 15 attachment position moving process performed in this step 9 moves the hologram 15 in, for example, the Y-axis direction (direction orthogonal to the surface formed by the X-axis and the laser beam). Do that. Here, this moving direction depends on the pattern of the servo detector 11.
[0049]
  Subsequently, in step 11, it is detected whether or not the differential value of the track error signal to be collected has become the maximum, and when it is determined that it does not become the maximum, the process returns to step 9 so that the focus servo is not applied. StatusFocus onThe mounting position of the hologram 15 that maximizes the differential value of the error signal is found.
[0050]
  In this way, the hologram 15 is moved in the Y-axis direction, and the focus servo is not applied as shown in FIG.Focus onThe attachment position of the hologram 15 in the X-axis direction is determined by finding a location where the differential value of the error signal is maximized.
[0051]
The fine adjustment of the hologram 15 is completed according to the processing procedure of FIG. 6 described above. When the fine adjustment of the hologram 15 is completed, the mounting position of the hologram 15 is fixed using an ultraviolet curable adhesive or the like, and then the adjustment of the composite prism 16 is started, and the composite prism 16 gripped by the gripping hand 30 is lasered. Coarse adjustment is performed by moving the optical prism of the diode 10 and recognizing the composite prism 16 by the CCD camera 32 and positioning it at a predetermined mounting position. Subsequently, fine adjustment of the mounting position of the composite prism 16 is performed.
[0052]
Next, fine adjustment processing of the composite prism 16 will be described in accordance with the processing procedure of FIG.
When the operator rotates the optical disc 100 and causes the laser diode 10 to emit light to complete preparations for fine adjustment processing of the composite prism 16, the operator activates and receives the fine adjustment processing execution program developed on the host computer 27. Then, the fine adjustment processing execution program enters the fine adjustment processing of the mounting position of the composite prism 16, and first, as shown in the processing procedure of FIG. And by instructing to apply track servo, focus servo and track servo are applied.
[0053]
Subsequently, in step 2, the automatic stage group 25 is controlled via the stage controller 26 to move the mounting position of the composite prism 16, and in step 3, the reproduction signal at that time is collected.
[0054]
Here, the mounting position moving process of the composite prism 16 performed in step 2 is performed by moving (rotating) in the θ direction / X axis direction / Y axis direction described above. Further, in order to facilitate the detection of the mounting position of the composite prism 16 where the amplitude of the reproduction signal is maximized, it is preferable to use an optical disc 100 that records prescribed data (for example, 2T).
[0055]
Subsequently, in step 4, it is detected whether or not the amplitude of the reproduction signal to be collected has become maximum, and when it is determined that the amplitude does not become maximum, the process returns to step 2 so that the focus servo and track signal are In this state, the mounting position of the composite prism 16 where the amplitude of the reproduction signal is maximized is found.
[0056]
In this way, by moving the composite prism 16 in the θ direction / X axis direction / Y axis direction and finding a portion where the amplitude of the reproduction signal is maximized in a state where the focus servo and the track servo are applied, The mounting position of the composite prism 16 is determined.
[0057]
When the fine adjustment of the composite prism 16 is completed, the adjustment of the integrated optical head 1 is completed by fixing the mounting position of the composite prism 16 using an ultraviolet curable adhesive or the like.
[0058]
  The present inventionTheServo mechanism that performs focus servo and track servoUse to adjustA configuration that allows fine adjustment of the mounting positions of device components such as the hologram 15 and the composite prism 16 while rotating the optical disc 100 prepared for adjustment.Is takenWhile applying the focus servo, collect the track error signal, finely adjust the mounting position of the device components so that the track error signal collected at that time will be the specified one, and apply the focus servo and track servo However, the gist is to adopt a configuration in which the reproduction signal is collected and the mounting position of the device component is finely adjusted so that the reproduction signal collected at that time becomes a specified one. It is possible to use the configuration on a real machine.
[0059]
  Ie, figureFor an optical disk apparatus having the apparatus configuration shown in FIG.If you want to useWhile applying the focus servo, the track error signal is collected, and the mounting position of the TES detector, for example, is finely adjusted so that the track error signal collected at that time becomes a specified one. Further, the reproduction signal is collected while applying the focus servo and the track servo, and the attachment position of the reproduction detector is finely adjusted so that the reproduction signal collected at that time becomes a specified one.
[0060]
Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited thereto. For example, in the embodiment, first, the mounting position of the hologram 15 where the track error signal is maximized when the focus servo is applied is found, and then the center of all the amplitudes of the track error signal is obtained while the focus servo is applied. Find the mounting position of the hologram 15 whose value is the reference voltage, and then find the mounting position of the hologram 15 where the differential value of the track error signal is maximized without applying the focus servo. Finally, the focus servo and the track servo are In this state, a configuration is adopted in which the mounting position of the composite prism 16 that maximizes the reproduction signal is found. However, these adjustment processes are independent of each other and can be executed regardless of other adjustment processes.
[0061]
【The invention's effect】
  As explained above, in the present inventionTheServo mechanism that performs focus servo and track servoUse to adjustA configuration that allows you to fine-tune the mounting position of device components such as holograms and composite prisms while rotating the optical disk to be preparedIs takenWhile applying the focus servo, collect the track error signal, finely adjust the mounting position of the device components so that the track error signal collected at that time becomes the specified one, and apply the focus servo and track servo However, since the reproduction signal is collected and the mounting position of the apparatus component is finely adjusted so that the reproduction signal collected at that time becomes a specified one, the apparatus is actually used. By being able to execute the adjustment of the components, it becomes possible to execute a highly accurate adjustment, and it is possible to greatly reduce the load required for the adjustment.
[0062]
Since the signal used for the adjustment and the signal used for the actual machine drive can be made the same, the positioning error due to the individual difference of the actual machine drive can be minimized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an integrated optical head.
FIG. 2 is an explanatory diagram of adjustment processing of an integrated optical head.
FIG. 3 is an explanatory diagram of adjustment processing of the integrated optical head.
FIG. 4 is an explanatory diagram of an apparatus used for adjusting an integrated optical head.
FIG. 5 is an explanatory diagram of a gripping hand.
FIG. 6 is a processing procedure for fine adjustment of an integrated optical head.
FIG. 7 is a processing procedure for fine adjustment of an integrated optical head.
FIG. 8 is an explanatory diagram of a servo error signal.
FIG. 9 is an explanatory diagram of movement of the hologram attachment position.
FIG. 10 is an explanatory diagram of a servo error signal.
FIG. 11 is an explanatory diagram of a servo error signal.
FIG. 12 is an explanatory diagram of a servo error signal.
FIG. 13 is an explanatory diagram of an optical disk device.
FIG. 14 is an explanatory diagram of an FES detector.
FIG. 15 is an explanatory diagram of a TES detector.
FIG. 16 is an explanatory diagram of a servo error signal.
[Explanation of symbols]
10 Laser diode
11 Servo detector
12 Reproduction detector
15 Hologram
16 Compound prism
20 Collimator lens
21 Objective lens
22 2-axis actuator
23 Servo system circuit
24 Signal detection circuit
25 Automatic stage
26 Stage controller
27 Host computer
100 optical disc

Claims (2)

A light-emitting element, a focus light-receiving element that generates a focus error signal, a track light-receiving element that generates a track error signal, and a reproduction light-receiving element that generates a reproduction signal are integrated in the stem. The light emitted from the light emitting element is irradiated onto the cap of the optical disk medium, the light reflected from the optical disk medium is split in accordance with the irradiation, and one of the lights is incident on the reproducing light receiving element. And the second optical element that is incident on the light receiving element for focusing and the light receiving element for tracking the other light split by the first optical element. a collecting product type optical head adjusting method for an adjustment target,
Before mounting the first optical element, the track error signal is collected while applying focus servo using the focus error signal, and the amplitude of the track error signal collected at that time is maximized. A first step of adjusting the mounting position of the two optical elements;
Before mounting the first optical element, the track error signal is collected using the focus error signal and the track error signal is collected, and the central value of all the amplitudes of the track error signal collected at that time becomes the reference value. A second process of adjusting the mounting position of the second optical element,
Before attaching the first optical element, the focus optical signal is canceled while the focus error signal is collected, and the second optical element is selected so that the differential value of the focus error signal collected at that time is maximized. A third step of adjusting the mounting position of
After completing the adjustment of the mounting position of the second optical element by the first, second and third processes, the first optical element is disposed at the mounting position, and focus servo is performed using a focus error signal. At the same time, the reproduction signal is collected while applying the track servo using the track error signal, and the mounting position of the first optical element is adjusted so that the amplitude of the reproduction signal collected at that time is maximized. Having a fourth process,
An integrated optical head adjustment method. The method of adjusting an integrated optical head according to claim 1,
The first optical element is a composite prism, and the second optical element is a hologram.
An integrated optical head adjustment method.

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