JP2004062929A - Manufacturing method of optical pickup device, optical pickup device and optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical pickup device which accurately corrects the deviation of the outgoing direction of each luminous flux ejected from a plurality of light sources. <P>SOLUTION: As for each luminous flux emitted from at least two specific light sources among the plurality of light sources proximately arranged each other, the information regarding the outgoing direction is acquired (steps 403∼415) after divergence angles are respectively adjusted by an adjusting optical element. Then, the position of the adjusting optical element is corrected (steps 417, 419) so that the outgoing directions of each luminous flux passed through the adjusting optical element are almost coincident, in accordance with the information regarding the acquired outgoing directions. Thus, e.g. even though the outgoing directions of each luminous flux emitted from at least two specific light sources are noncoincident each other at the outgoing position, the outgoing directions of each luminous flux become coincident each other at the time after passed through the adjusting optical element. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an optical pickup device, an optical pickup device, and an optical disk device, and more particularly, to irradiating a recording surface of a plurality of types of information recording media with light and receiving reflected light from the recording surface. The present invention relates to a method for manufacturing an optical pickup device, an optical pickup device manufactured by the manufacturing method, and an optical disk device including the optical pickup device.
[0002]
[Prior art]
In an optical disc device, an information recording medium such as an optical disc is used, and recording or erasing of information is performed by irradiating a recording surface on which a spiral or concentric track is formed with laser light, and reflected light from the recording surface. Based on the information. The optical disc device is provided with an optical pickup device as a device for irradiating a recording surface of the information recording medium with laser light to form a light spot and receiving reflected light from the recording surface.
[0003]
Usually, an optical pickup device includes an objective lens, an optical system that guides a light beam emitted from a light source to a recording surface of an information recording medium, and guides a return light beam reflected by the recording surface to a predetermined light receiving position, and a light receiving position. And a light-receiving element arranged in the first position. These are assembled in the housing of the optical pickup device.
[0004]
As optical disks, CDs (Compact Discs) are already widely used. Further, in recent years, a DVD (Digital Versatile Disc) having a recording capacity which is significantly larger than a CD has been generalized. A laser beam having a wavelength of 780 nm is used to perform recording and reproduction on a CD, and a laser beam having a wavelength of 650 nm is used to perform recording and reproduction on a DVD. An optical disk device for a CD and an optical disk device for a DVD have been used independently as peripheral devices of information equipment such as a personal computer (hereinafter referred to as a "personal computer").
[0005]
After that, as the information devices become smaller and lighter, the need for an optical disk device that can access both a CD and a DVD has increased. In this case, the optical pickup device includes a semiconductor laser that emits a light beam having a wavelength of 650 nm (hereinafter also referred to as “650 nm light beam”) and a semiconductor laser that emits a light beam having a wavelength of 780 nm (hereinafter also referred to as “780 nm light beam”). It is necessary as a light source, and further, an optical system corresponding to a 650 nm light beam and an optical system corresponding to a 780 nm light beam are required. However, if the optical system for the 650 nm light beam and the optical system for the 780 nm light beam are individually arranged, there is a disadvantage that the optical pickup device becomes large. Hereinafter, an optical pickup device that includes two light sources and emits light beams having different wavelengths from each light source is also referred to as a “two-wavelength optical pickup device”.
[0006]
In order to reduce the thickness and weight, a two-wavelength optical pickup device in which a collimator lens and an objective lens constituting an optical system are shared for light beams having different wavelengths has been developed and put into practical use.
[0007]
[Problems to be solved by the invention]
Furthermore, it has become desirable to mount an optical disk device compatible with both a CD and a DVD on a small information device such as a notebook personal computer. In order to further reduce the size and thickness, two light sources must be located close to each other. It was proposed that they be arranged and unitized.
[0008]
A light beam emitted from a semiconductor laser generally used as a light source has a major axis direction perpendicular to an active layer (heterojunction plane) AL of the semiconductor laser LD as shown in FIG. This is divergent light having an elliptical intensity distribution.
[0009]
In this case, if the mounting position of each light source is deviated from the designed position, or if the position of the active layer in each light source varies due to a manufacturing error or the like, at least the maximum intensity of the light flux emitted from at least one of the light sources The direction (hereinafter abbreviated as “emission direction”) is different from the expected direction, and there is a disadvantage that a wavefront aberration occurs or the light use efficiency is reduced.
[0010]
The present invention has been made under such circumstances, and a first object of the present invention is to provide a method of manufacturing an optical pickup device capable of accurately correcting a deviation in the emission direction of each light beam emitted from a plurality of light sources. To provide.
[0011]
Further, a second object of the present invention is to provide an optical pickup device in which the generation of wavefront aberration and the decrease in light use efficiency due to a shift in the emission direction of each light beam emitted from a plurality of light sources are suppressed. is there.
[0012]
Further, a third object of the present invention is to provide an optical disk device which can correspond to a plurality of types of information recording media and can perform high-speed access to each information recording medium accurately and stably. It is in.
[0013]
[Means for Solving the Problems]
The invention according to claim 1, wherein at least two light sources including at least two specific light sources arranged close to each other, and adjustment optics for adjusting a divergence angle of each light beam emitted from the at least two specific light sources, respectively. An optical system including an element and guiding each light beam emitted from each light source to a recording surface of a corresponding information recording medium, and guiding a return light beam reflected by the recording surface to a predetermined light receiving position. A method for manufacturing an optical pickup device for manufacturing the optical pickup device, comprising: an information acquisition step of emitting light beams from the at least two specific light sources, respectively, and acquiring information on an emission direction of each light beam that has passed through the adjustment optical element; The position of the adjustment optical element is corrected based on the acquired information on the emission direction, and the emission direction of each light beam emitted from the specific light source is changed. Method of manufacturing an optical pickup apparatus comprising: causing crucible match and correction step.
[0014]
According to this, each luminous flux emitted from at least two specific light sources of the plurality of light sources arranged close to each other is adjusted with the divergence angle by the adjusting optical element, and then the information on the emission direction is obtained. Is acquired (information acquisition step). Then, based on the acquired information on the emission direction, the position of the adjustment optical element is corrected such that the emission directions of the light beams passing through the adjustment optical element substantially match (correction step). For this reason, for example, even if the emission directions of the light beams emitted from at least two specific light sources do not match each other at the emission position, the emission directions of the light beams match each other after passing through the adjusting optical element. It becomes. That is, it is possible to correct the deviation of the light beams emitted from the plurality of light sources in the emission direction. The position correction of the adjustment optical element in the correction step may be performed manually, or may be performed automatically using a driving unit. Here, the “information on the emission direction” is not only information on the emission direction but also information including information that changes in response to a change in the emission direction, information that can be converted into information on the emission direction, and the like. .
[0015]
In this case, as in the method of manufacturing the optical pickup device according to the second aspect, the method further includes a step of arranging an optical element for converting the light beam into substantially parallel light on an optical path of the light beam passing through the adjustment optical element. It can be.
[0016]
In the method of manufacturing each optical pickup device according to the first and second aspects, as in the method of manufacturing an optical pickup device according to the third aspect, the at least two specific light sources are a first light source and a second light source. In the information acquisition step, the first light source and the second light source can emit light at the same time. In such a case, the information on the emission direction of the light beam emitted from the first light source and the information on the emission direction of the light beam emitted from the second light source are obtained almost simultaneously, or the information is emitted from the first light source. Immediately after acquiring the information on the emission direction of the emitted light beam, it is possible to immediately shift to the process of acquiring information on the emission direction of the light beam emitted from the second light source, so that the processing time in the information acquisition step can be reduced. It becomes.
[0017]
In this case, as in the method for manufacturing an optical pickup device according to the fourth aspect, in the information acquiring step, the light emission intensity of the first light source and the light emission intensity of the second light source are different from each other. be able to. Alternatively, as in the method of manufacturing an optical pickup device according to claim 5, a first filter that selectively transmits a light beam emitted from the first light source and a light beam emitted from the second light source are selected. The method may further include a step of arranging any of the second filters that allow the light to pass through the optical path of the light flux emitted from the first and second light sources.
[0018]
In the method of manufacturing an optical pickup device according to any one of claims 1 to 5, as in the method of manufacturing an optical pickup device according to claim 6, in the information acquiring step, a light receiving position of a light beam passing through the adjustment optical element is provided. Can be used. In such a case, the emission direction of the light beam can be obtained by a geometric calculation based on the light receiving position of the detected light beam.
[0019]
In the method for manufacturing an optical pickup device according to claim 3, as in the method for manufacturing an optical pickup device according to claim 7, a light beam emitted from the first light source is transmitted and the second light source is transmitted. A branch optical element that reflects a light beam emitted from the optical device is disposed on an optical path of a light beam that has passed through the adjustment optical element, and a first position detector is disposed at a light receiving position of the light beam that has passed through the branch optical element. A step of arranging a second position detector at a light receiving position of the light beam reflected by the branching optical element, wherein the information obtaining step includes emitting the light from the first light source using the first position detector. Information about the emission direction of the light beam emitted from the second light source may be acquired using the second position detector. In such a case, information about the emission direction of the light beam emitted from the first light source and information about the emission direction of the light beam emitted from the second light source can be acquired almost at the same time. Processing time can be reduced.
[0020]
In the method for manufacturing each optical pickup device according to the first and second aspects, as in the method for manufacturing an optical pickup device according to the eighth aspect, in the information acquiring step, the specific light sources are sequentially emitted. can do.
[0021]
The method for manufacturing each optical pickup device according to any one of claims 1 to 8, further comprising a step of displaying the information regarding the acquired emission direction, as in the method for manufacturing an optical pickup device according to claim 9. can do. In such a case, for example, by performing the processing in the correction process while referring to the display contents, it is possible to surely reduce the deviation of the emission direction of each light beam.
[0022]
In the method of manufacturing an optical pickup device according to any one of the first to ninth aspects, the adjustment optical element may be a meniscus lens, as in the method of manufacturing the optical pickup device according to the tenth aspect.
[0023]
An eleventh aspect of the present invention is an optical pickup device manufactured by the method for manufacturing an optical pickup device according to any one of the first to tenth aspects.
[0024]
According to this, since the optical pickup device is manufactured by the method for manufacturing an optical pickup device according to any one of claims 1 to 10, a deviation in an emission direction of each light beam emitted from the plurality of light sources in a manufacturing stage. The mounting position of the adjustment optical element is corrected to be extremely small. Therefore, it is possible to suppress the occurrence of wavefront aberration in each light beam and the decrease in light use efficiency.
[0025]
According to a twelfth aspect of the present invention, there is provided an optical disc device for performing at least reproduction of information recording, reproduction, and erasure on an information recording medium, and the optical pickup device according to the eleventh aspect; A processing device that performs at least one of recording, reproducing, and erasing of the information by using an output signal of the device.
[0026]
According to this, the optical pickup device according to claim 11 is provided, in which a shift in the emission direction of each light beam emitted from the plurality of light sources is reduced as much as possible, and generation of wavefront aberration and reduction in light use efficiency are suppressed. Therefore, it is possible to cope with a plurality of types of information recording media, and it is possible to stably perform at least high-speed access with at least reproduction among information recording, reproduction, and erasure.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
<< 1st Embodiment >>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0028]
FIG. 1 shows a schematic configuration of an optical disk device 20 according to a first embodiment including an optical pickup device according to the present invention.
[0029]
The optical disk device 20 shown in FIG. 1 includes a spindle motor 22, an optical pickup device 23, a laser control circuit 24, an encoder 25, a motor driver 27, a reproduction signal processing circuit 28 for rotating and driving an optical disk 15 as an information recording medium. , A servo controller 33, a buffer RAM 34, a buffer manager 37, an interface 38, a ROM 39, a CPU 40, a RAM 41, and the like. Note that the arrows in FIG. 1 indicate typical flows of signals and information, and do not indicate all of the connection relationships of the respective blocks.
[0030]
The optical pickup device 23 is a device for irradiating a recording surface of an information recording medium such as the optical disk 15 with laser light and receiving reflected light from the recording surface. The configuration and the like of the optical pickup device 23 will be described later in detail.
[0031]
The reproduction signal processing circuit 28 detects a wobble signal, an RF signal, a servo signal (a focus error signal, a track error signal) and the like based on an output signal from the optical pickup device 23. Then, the reproduction signal processing circuit 28 extracts address information, a synchronization signal, and the like from the wobble signal. The address information extracted here is output to the CPU 40, and the synchronization signal is output to the encoder 25. Further, the reproduction signal processing circuit 28 performs an error correction process or the like on the RF signal, and stores the RF signal in the buffer RAM 34 via the buffer manager 37. The servo signal is output from the reproduction signal processing circuit 28 to the servo controller 33.
[0032]
The servo controller 33 generates various control signals for controlling the optical pickup device 23 based on the servo signals, and outputs the control signals to the motor driver 27.
[0033]
The buffer manager 37 manages the input and output of data to and from the buffer RAM 34, and notifies the CPU 40 when the accumulated data amount reaches a predetermined value.
[0034]
The motor driver 27 controls the optical pickup device 23 and the spindle motor 22 based on a control signal from the servo controller 33 and an instruction from the CPU 40.
[0035]
The encoder 25 fetches the data stored in the buffer RAM 34 via the buffer manager 37 based on an instruction from the CPU 40, adds an error correction code, etc., creates data to be written on the optical disk 15, and reproduces the data. The write data is output to the laser control circuit 24 in synchronization with the synchronization signal from the signal processing circuit 28.
[0036]
The laser control circuit 24 controls the output of the laser light emitted from the optical pickup device 23 based on the write data from the encoder 25 and the instruction from the CPU 40. The laser control circuit 24 controls one of two light sources of the optical pickup device 23 to be described later based on an instruction from the CPU 40.
[0037]
The interface 38 is a two-way communication interface with a host (for example, a personal computer), and conforms to a standard interface such as ATAPI (AT Attachment Packet Interface) and SCSI (Small Computer System Interface).
[0038]
The ROM 39 stores a program described in a code decodable by the CPU 40. Then, the CPU 40 controls the operation of each unit according to the program stored in the ROM 39, and temporarily stores data and the like necessary for the control in the RAM 41.
[0039]
Next, the configuration and the like of the optical pickup device 23 will be described with reference to FIGS.
[0040]
As shown in FIG. 2, the optical pickup device 23 includes a light source unit 51, a divergence angle adjustment lens 70 as an adjustment optical element, a collimator lens 52, a beam splitter 54, an objective lens 60, a detection lens 58, and the like. The optical system includes an optical system that guides a light beam emitted from the unit 51 to a recording surface of the optical disk 15 and guides a return light beam reflected by the recording surface to a predetermined light receiving position, and a light receiver 59 disposed at the light receiving position. ing. The light source unit 51, the optical system, and the light receiver 59 are assembled in a predetermined positional relationship within the housing of the optical pickup device. This will be further described later.
[0041]
As shown in FIG. 3, the light source unit 51 includes a first semiconductor laser 51a that emits laser light having a wavelength of 650 nm, a second semiconductor laser 51b that emits laser light having a wavelength of 780 nm, and the like. Have been. The semiconductor lasers are mounted on a substrate (not shown) close to each other, and are arranged at a predetermined distance in the X-axis direction. The designed maximum intensity emission direction of each light beam emitted from the light source unit 51 is defined as a −Z direction. The first semiconductor laser 51a is selected when the optical disk 15 is a DVD, and the second semiconductor laser 51b is selected when the optical disk 15 is a CD.
[0042]
The divergence angle adjusting lens 70 is disposed on the −Z side of the light source unit 51, and as shown in FIG. 4 as an example, a light beam emitted from the first semiconductor laser 51a (hereinafter also referred to as “first light beam”). The negative meniscus lens 70a for adjusting (enlarging) the divergence angle and the positive meniscus lens for adjusting (reducing) the divergence angle of the light beam (hereinafter also referred to as “second light beam”) emitted from the second semiconductor laser 51b. 70b. That is, the negative meniscus lens 70a and the positive meniscus lens 70b are integrated, and when the divergence angle adjusting lens 70 shifts, both meniscus lenses shift in the same direction by the same distance. Note that the cylinder buses in each meniscus lens are orthogonal to each other.
[0043]
The collimating lens 52 is disposed on the -Z side of the divergence angle adjusting lens 70, and converts a light beam passing through the divergence angle adjusting lens 70 into substantially parallel light. The beam splitter 54 is disposed on the −Z side of the collimator lens 52.
[0044]
The objective lens 60 is disposed on the −Z side of the beam splitter 54, condenses a light beam transmitted through the beam splitter 54, and forms a light spot on a recording surface of the optical disc 15.
[0045]
The detection lens 58 is disposed on the −X side of the beam splitter 54, and collects the return light beam reflected by the beam splitter 54. The light receiver 59 is disposed on the −X side of the detection lens 58. As the light receiver 59, a four-divided light receiving element is used as in a normal optical disk device. The light receiver 59 receives the reflected light from the recording surface of the optical disk 15 and outputs a signal including wobble signal information, reproduced data information, focus error information, track error information, and the like, similarly to a normal optical pickup device. .
[0046]
Returning to FIG. 2, the operation of the optical pickup device 23 configured as described above will be described. The luminous flux (first luminous flux) emitted from the first semiconductor laser 51a has a divergence angle of a negative meniscus lens 70a. After being enlarged and converted into substantially parallel light by the collimating lens 52, the light enters the beam splitter 54. The first light beam transmitted through the beam splitter 54 is condensed as a minute spot on the recording surface of the optical disc 15 via the objective lens 60.
[0047]
On the other hand, the luminous flux (second luminous flux) emitted from the second semiconductor laser 51b is reduced in its divergence angle by the positive meniscus lens 70b, turned into substantially parallel light by the collimator lens 52, and then enters the beam splitter 54. I do. The second light flux transmitted through the beam splitter 54 is condensed as a minute spot on the recording surface of the optical disc 15 via the objective lens 60.
[0048]
The light reflected on the recording surface of the optical disk 15 is converted into substantially parallel light by the objective lens 60 as a return light flux, and is incident on the beam splitter 54. The return light beam branched in the −X direction by the beam splitter 54 is received by the light receiver 59 via the detection lens 58. From the light receiver 59, a signal corresponding to the amount of received light is output to the reproduction signal processing circuit 28.
[0049]
Next, a method of manufacturing the optical pickup device 23 configured as described above will be described with reference to a flowchart of FIG. 5 showing a procedure of manufacturing the optical pickup device 23 and appropriately referring to other drawings.
[0050]
In the first step 401, as shown in FIG. 6A, the light source unit 51 and the divergence angle adjusting lens 70 are assembled to the housing 50 of the optical pickup device. At this time, the light source unit 51 is assembled to the housing 50 while being held by the holder 61.
[0051]
In the next step 403, as shown in FIG. 6A, the divergence angle is adjusted by the collimator lens 81 as an optical element for converting each light beam transmitted through each meniscus lens of the divergence angle adjustment lens 70 into substantially parallel light. It is arranged on the −Z side of the lens 70. Here, the collimator lens 81 is arranged such that the optical axis of the collimator lens 81 substantially matches the optical axis of the collimator lens 52. Subsequently, a light receiving element 82 for detection as a first position detector for receiving the light flux substantially parallelized by the collimating lens 81 is arranged at a predetermined position on the −Z side of the collimating lens 81. As shown in FIG. 6B, a U-shaped slide guide 50a protruding inward is formed on one wall of the housing 50 in the Y-axis direction. Therefore, the light receiving element for detection 82 is accurately positioned at the predetermined position along the slide guide 50a. Note that the collimating lens 81 and the light receiving element for detection 82 may be integrated. As shown in FIG. 6A, a measurement control device 83 is connected to the detection optical element 82.
[0052]
As the detection light-receiving element 82, as shown in FIG. 7 as an example, a four-division light-receiving element divided into four by a division line DX in the X-axis direction and a division line DY in the Y-axis direction is used. That is, the detection light-receiving element 82 includes a first partial light-receiving element 82a, a second partial light-receiving element 82b, a third partial light-receiving element 82c, and a fourth partial light-receiving element 82d. Here, the + X side (upper left side of the drawing) of the dividing line DY is the first partial light receiving element 82a, and the + X side (upper right side of the drawing) of the dividing line DY is the -Y side of the dividing line DX. The second partial light receiving element 82b, the -Y side of the dividing line DX, the -X side (lower right side of the drawing) of the dividing line DY is the third partial light receiving element 82c, the + Y side of the dividing line DX, the -X side of the dividing line DY ( The lower left side of the drawing) is referred to as a fourth partial light receiving element 82d. Then, the photoelectric conversion signal of each partial light receiving element is output to the measurement control device 83. In the present embodiment, the position of the center of the intensity of the received light beam is indicated by using the intersection of each division line as the origin, the X-axis direction as the X coordinate, and the Y-axis direction as the Y coordinate.
[0053]
In the next step 405, the driving device 88 is attached to the divergence angle adjusting lens 70. The driving device 88 drives the divergence angle adjusting lens 70 in the X-axis direction and the Y-axis direction based on an instruction from the measurement control device 83.
[0054]
The measurement control device 83 converts the output signal from the first partial light receiving element 82a into a voltage signal S82a and converts the output signal from the second partial light receiving element 82b into a voltage signal S82b, as shown in FIG. 8 as an example. An IV conversion circuit 83a for converting the output signal from the third partial light receiving element 82c into a voltage signal S82c, and converting the output signal from the fourth partial light receiving element 82d into a voltage signal S82d, and a signal S82a. An adder 83b for adding the signal S82b; an adder 83c for adding the signal S82c and the signal S82d; an adder 83d for adding the signal S82a and the signal S82d; an adder 83e for adding the signal S82b and the signal S82c; The output signal S83b of the adder 83d, the output signal S83b of the adder 83d, and the output signal S8 of the adder 83d for obtaining a difference signal. A position correction amount of the divergence angle adjusting lens 70 is calculated based on the output signal SPx of the subtractor 83g and the output signal SPy of the subtracter 83g, which calculate a difference signal between the output signal S83e and the output signal S83e of the adder 83e. The correction amount calculation circuit 83h, the nonvolatile memory 83i in which various kinds of information necessary for the calculation of the position correction amount in the correction amount calculation circuit 83h are stored, and the drive signal to the driving device 88 based on the calculation result in the correction amount calculation circuit 83h. Is provided. Further, the correction amount calculation circuit 83h also controls on / off of each semiconductor laser. That is, the signal SPx is obtained by the following equation (1), and the signal SPy is obtained by the following equation (2).
[0055]
SPx = (S82a + S82b)-(S82c + S82d) (1)
[0056]
SPy = (S82a + S82d)-(S82b + S82c) (2)
[0057]
Then, it instructs the measurement control device 83 to correct the position of the divergence angle adjusting lens 70. As a result, in the measurement control device 83, the position correction processing of the following steps 407 to 419 is executed.
[0058]
In step 407, the first semiconductor laser 51a is turned on by the correction amount calculation circuit 83h, and the first light beam is emitted from the light source unit 51. After the divergence angle of the first light beam is expanded by the negative meniscus lens 70a, the first light beam is received by the detection light-receiving element 82 via the collimator lens 81. A signal corresponding to the amount of received light is output to the measurement control device 83 from each of the partial light receiving elements constituting the light receiving element for detection 82. Then, the measurement control device 83 performs the above arithmetic processing, and calculates the signal SPx and the signal SPy.
[0059]
In the next step 409, the coordinates (Px1, Py1) of the intensity center position of the first light beam on the light receiving surface of the light receiving element for detection 82 are obtained by the correction amount calculation circuit 83h based on the signals SPx and SPy. The result is stored in the nonvolatile memory 83i. Then, the first semiconductor laser 51a is turned off by the correction amount calculation circuit 83h, and the emission of the first light beam is stopped.
[0060]
In the next step 411, the second semiconductor laser 51b is turned on by the correction amount calculation circuit 83h, and the second light beam is emitted from the light source unit 51. After the divergence angle of the second light beam is reduced by the positive meniscus lens 70b, the second light beam is received by the detection light-receiving element 82 via the collimator lens 81. A signal corresponding to the amount of received light is output to the measurement control device 83 from each of the partial light receiving elements constituting the light receiving element for detection 82. Then, the measurement control device 83 performs the above arithmetic processing, and calculates the signal SPx and the signal SPy.
[0061]
In the next step 413, the coordinates (Px2, Py2) of the intensity center position of the second light flux on the light receiving surface of the light receiving element for detection 82 are obtained by the correction amount calculation circuit 83h based on the signals SPx and SPy. Then, the second semiconductor laser 51b is turned off by the correction amount calculation circuit 83h, and emission of the second light beam is stopped.
[0062]
In the next step 415, the correction amount calculation circuit 83h sets the coordinates (Px1, Py1) of the intensity center position of the first light flux and the coordinates (Px2, Py2) of the intensity center position of the second light flux so as to match. The position correction amount Mx of the divergence angle adjustment lens 70 in the X-axis direction is calculated based on Expression (3), and the position correction amount My of the divergence angle adjustment lens 70 in the Y-axis direction is calculated based on Expression (4). Is calculated.
[0063]
Mx = Rx × (Px2-Px1) (3)
[0064]
My = Ry × (Py1-Py2) (4)
[0065]
Here, when the divergence angle adjusting lens 70 is moved by Tx in the X-axis direction and the movement amount of the intensity center of the received light beam in the light-receiving element 82 in the X-axis direction is tx, the following Rx is obtained. It is a value obtained by the expression 5).
[0066]
Rx = Tx / tx (5)
[0067]
Further, when the divergence angle adjusting lens 70 is moved by Ty in the Y-axis direction and the movement amount of the intensity center of the received light beam in the detection light-receiving element 82 in the Y-axis direction is ty, the following (6) is used. )).
[0068]
Ry = Ty / ty (6)
[0069]
Rx and Ry are obtained in advance by theoretical calculations or experiments and stored in the nonvolatile memory 83i. The position correction amounts Mx and My of the divergence angle adjustment lens 70 are output from the correction amount calculation circuit 83h to the driver 83j.
[0070]
In the next step 417, a driving signal is generated by the driver 83j based on the position correction amounts Mx and My of the divergence angle adjusting lens 70, and is output to the driving device 88.
[0071]
In the next step 419, the driving device 88 drives the divergence angle adjusting lens 70 based on the driving signal. Thus, the position correction processing of the divergence angle adjusting lens 70 by the measurement control device 83 ends. Then, the divergence angle adjusting lens 70 is fixed to the housing 50 with screws or the like (not shown).
[0072]
In the next step 421, the collimator lens 81 and the light receiving element 82 for detection are removed from the optical path. The driving device 88 is also detached from the divergence angle adjusting lens 70.
[0073]
In the next step 423, the remaining optical components (the collimator lens 52, the beam splitter 54, the objective lens 60, the detection lens 58 shown in FIG. 2) and the light receiver 59, which have not been assembled, are placed in the housing 50. After assembling according to the design values, by performing processing such as attaching a cover (cover) to the housing, the manufacture of the optical pickup device 23 is completed. At this time, the optical system, the light source unit 51, and the light receiver 59 are assembled in an ideal positional relationship.
[0074]
《Recording process》
Next, a processing operation for recording data on the optical disk 15 using the above-described optical disk device 20 will be briefly described. Whether the optical disk 15 is a CD or a DVD can be determined from the intensity of light reflected from the recording surface. Usually, this determination is performed when the optical disk 15 is set at a predetermined position of the optical disk device 20, that is, at the time of loading. In addition, the type of the optical disc 15 can be determined based on TOC (Table Of Contents) information, PMA (Program Memory Area) information, a wobble signal, and the like, which are recorded in the optical disc 15 in advance. Then, the determination result is notified to the laser control circuit 24, and the laser control circuit 24 selects a semiconductor laser to be controlled. Therefore, here, it is assumed that any one of the semiconductor lasers is already selected.
[0075]
Upon receiving the recording request command from the host, the CPU 40 outputs a control signal for controlling the rotation of the spindle motor 22 to the motor driver 27 based on the specified recording speed, and receives the recording request command from the host. This is notified to the reproduction signal processing circuit 28. Further, the CPU 40 stores the data received from the host in the buffer RAM 34 via the buffer manager 37.
[0076]
When the rotation of the optical disk 15 reaches a predetermined linear velocity, the reproduction signal processing circuit 28 detects a track error signal and a focus error signal based on the output signal of the light receiver 59 and outputs the signals to the servo controller 33. The servo controller 33 drives the tracking actuator of the optical pickup device 23 via the motor driver 27 based on the track error signal, and corrects a track shift. Further, the servo controller 33 drives the focusing actuator of the optical pickup device 23 via the motor driver 27 based on the focus error signal, and corrects a focus shift. In this way, tracking control and focus control are performed.
[0077]
The reproduction signal processing circuit 28 acquires address information based on the output signal of the light receiver 59 and notifies the CPU 40 of the address information. Then, the CPU 40 outputs a signal for controlling the seek motor of the optical pickup device 23 to the motor driver 27 based on the address information so that the optical pickup device 23 is located at the designated writing start point.
[0078]
When receiving from the buffer manager 37 that the amount of data accumulated in the buffer RAM 34 has exceeded a predetermined value, the CPU 40 instructs the encoder 25 to create write data. When the CPU 40 determines that the position of the optical pickup device 23 is the writing start point based on the address information, the CPU 40 notifies the encoder 25. Then, the encoder 25 records the write data on the optical disk 15 via the laser control circuit 24 and the optical pickup device 23.
[0079]
《Reproduction processing》
Next, a processing operation for reproducing data recorded on the optical disk 15 using the above-described optical disk device 20 will be briefly described. It is assumed that any one of the semiconductor lasers is already selected as in the recording process.
[0080]
When the CPU 40 receives a reproduction request command from the host, the CPU 40 outputs a control signal for controlling the rotation of the spindle motor 22 to the motor driver 27 based on the reproduction speed, and reproduces that the reproduction request command has been received from the host. Notify the signal processing circuit 28. Then, when the rotation of the optical disk 15 reaches a predetermined linear velocity, tracking control and focus control are performed as in the case of the recording processing. Further, the reproduction signal processing circuit 28 detects the address information and notifies the CPU 40 as in the case of the recording processing.
[0081]
The CPU 40 outputs a signal for controlling the seek motor to the motor driver 27 based on the address information so that the optical pickup device 23 is located at the designated reading start point. When the CPU 40 determines that the position of the optical pickup device 23 is the reading start point based on the address information, the CPU 40 notifies the reproduction signal processing circuit 28.
[0082]
Then, the reproduction signal processing circuit 28 detects the RF signal based on the output signal of the light receiver 59, performs error correction processing and the like, and then stores the signal in the buffer RAM 34. The buffer manager 37 transfers the reproduced data stored in the buffer RAM 34 to the host via the interface 38 when the data is prepared as sector data.
[0083]
Note that the tracking control and the focus control are performed as needed until the recording processing and the reproduction processing are completed.
[0084]
As is clear from the above description, in the first embodiment, the information acquisition step of the manufacturing method according to the present invention is performed by the processing of steps 403 to 415 in FIG. The correction process is performed by the process of 419.
[0085]
Further, in the optical disc device 20 according to the first embodiment, a processing device is realized by the reproduction signal processing circuit 28, the CPU 40, and a program executed by the CPU 40.
[0086]
As described above, according to the method of manufacturing the optical pickup device according to the first embodiment, when the light source unit 51 and the divergence angle adjusting lens 70 are assembled, the first semiconductor laser 51a and the second semiconductor laser The laser 51b emits light sequentially, and the first light flux whose divergence angle is enlarged by the negative meniscus lens 70a and the second light flux whose divergence angle is reduced by the positive meniscus lens 70b are received by the detection light-receiving element 82, respectively. Then, the intensity center position of each light beam is detected. If the intensity center positions of the light beams do not match, the mounting position of the divergence angle adjusting lens 70 is corrected so that the intensity center positions of the light beams match. For this reason, even when the emission direction of the first light flux and the emission direction of the second light flux when emitted from the light source unit 51 do not coincide with each other, at the time of passing through the divergence angle adjusting lens 70, The emission directions coincide with each other. That is, it is possible to correct the deviation of the light beams emitted from the plurality of light sources in the emission direction. Further, since an inexpensive four-segment light receiving element is used as the light receiving element 82 for detection, the position correction processing of the divergence angle adjusting lens 70 can be performed at low cost.
[0087]
Further, since the optical pickup device 23 according to the first embodiment is manufactured by the above-described manufacturing method, after passing through the divergence angle adjusting lens 70, the emission direction of the first light beam and the second light beam Are almost coincident with the emission direction. Therefore, it is possible to suppress the occurrence of wavefront aberration and the decrease in light use efficiency in each light beam emitted from the plurality of light sources.
[0088]
Further, the optical disc device 20 according to the first embodiment includes the optical pickup device in which the generation of the wavefront aberration and the decrease in the light use efficiency of each light beam emitted from the plurality of light sources are suppressed, so Therefore, it is possible to accurately and stably perform an access including at least reproduction among information recording, reproduction, and erasure at a high speed. Furthermore, the miniaturization of the optical pickup device can promote the miniaturization of the optical disc device itself and reduction of power consumption. For example, when the optical pickup device is used for portable use, it is easy to carry and can be used for a long time. It becomes.
[0089]
<< 2nd Embodiment >>
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
[0090]
In the second embodiment, the first semiconductor laser 51a and the second semiconductor laser 51b emit light simultaneously, and the first light beam and the second light beam are emitted during the above-described position correction processing of the divergence angle adjusting lens. The feature is that a filter for selecting one of the light beams is used. The other configurations of the optical pickup device and the optical disk device are the same as those of the first embodiment. Therefore, the following description will focus on the differences from the first embodiment, and the same or equivalent components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be simplified. Or, it shall be omitted.
[0091]
FIG. 9 is a flowchart illustrating a procedure for manufacturing the optical pickup device 23 according to the second embodiment.
[0092]
In the first step 501, the same processing as in the step 401 is performed.
[0093]
In the next step 503, first, the collimator lens 81 is arranged at a predetermined position in the same manner as in step 403. Next, as shown in FIG. 10A, a filter 84 is arranged on the −Z side of the collimating lens 81. Here, the collimator lens 81 is arranged so that the light flux converted into substantially parallel light enters a part of the filter 84 (the lower half in FIG. 10A). As shown in FIG. 10B, for example, the filter 84 has a disc shape and is divided into two transmission regions (a first transmission region 84a and a second transmission region 84b) by a straight line passing through the center. Have been. The first transmission region 84a has a characteristic of selectively transmitting the first light beam, and the second transmission region 84b has a characteristic of selectively transmitting the second light beam. Further, the filter 84 is provided with a rotation drive mechanism (not shown), and is rotatable in the XY plane with an axis in the Z-axis direction passing through the center thereof as a rotation axis according to an instruction from the measurement control device 83 '. Subsequently, the light receiving element 82 for detection is arranged on the −Z side of the filter 84. As shown in FIG. 10A, a measurement control device 83 ′ is connected to the detection optical element.
[0094]
As shown in FIG. 11 as an example, the measurement control device 83 ′ uses a correction amount calculation circuit 83h ′ to which a control function of a filter 84 is added instead of the correction amount calculation circuit 83h in the measurement control device 83 described above. Has been. Other configurations are the same as those of the measurement control device 83. Therefore, hereinafter, the same reference numerals are used for the same or equivalent components as those of the measurement control device 83, and the description thereof will be omitted.
[0095]
In the next step 505, the same processing as in step 405 is performed.
[0096]
Then, it instructs the measurement control device 83 'to correct the position of the divergence angle adjusting lens 70. As a result, in the measurement control device 83 ', the position correction processing of the following steps 507 to 521 is executed.
[0097]
In the next step 507, the rotation of the filter 84 is controlled by the correction amount calculation circuit 83h 'so that the light flux converted into substantially parallel light by the collimator lens 81 enters the first transmission region 84a.
[0098]
In the next step 509, the first semiconductor laser 51 a and the second semiconductor laser 51 b are turned on by the correction amount calculation circuit 83 h ′, and the first light beam and the second light beam are emitted from the light source unit 51. . After the divergence angle of the first light beam is expanded by the negative meniscus lens 70 a, the first light beam enters the filter 84 via the collimator lens 81. After the divergence angle of the second light beam is reduced by the positive meniscus lens 70b, the second light beam enters the filter 84 via the collimator lens 81. Only the first light beam passes through the filter 84 and is received by the light receiving element 82 for detection. From each of the partial light receiving elements constituting the light receiving element for detection 82, a signal corresponding to the amount of received light is output to the measurement control device 83 '. Then, the measurement control device 83 'calculates the signal SPx and the signal SPy in the same manner as in the first embodiment.
[0099]
In the next step 511, the same processing as in step 409 is performed.
[0100]
In the next step 513, the rotation of the filter 84 is controlled by the correction amount calculation circuit 83h 'so that the light flux converted into substantially parallel light by the collimator lens 81 enters the second transmission region 84b. That is, the filter 84 rotates 180 degrees. As a result, only the second light flux passes through the filter 84 and is received by the light receiving element 82 for detection. From each of the partial light receiving elements constituting the light receiving element for detection 82, a signal corresponding to the amount of received light is output to the measurement control device 83 '. Then, the measurement control device 83 'calculates the signal SPx and the signal SPy in the same manner as in the first embodiment.
[0101]
In the next steps 515 to 521, the same processing as in the above steps 413 to 419 is performed. Then, the position correction processing of the divergence angle adjusting lens 70 by the measurement control device 83 'ends.
[0102]
In the next step 523, the collimator lens 81, the filter 84, and the light receiving element 82 for detection are removed from the optical path. The driving device 88 is also detached from the divergence angle adjusting lens 70.
[0103]
In the next step 525, the same processing as in step 423 is performed, and the manufacture of the optical pickup device 23 ends. At this time, the optical system, the light source unit 51, and the light receiver 59 are assembled in an ideal positional relationship.
[0104]
As is apparent from the above description, in the second embodiment, the information acquisition step of the manufacturing method according to the present invention is performed by the processing of steps 503 to 517 in FIG. The correction process is performed by the process of 521.
[0105]
Further, in the optical disc device 20 according to the second embodiment, as in the first embodiment, a processing device is realized by the reproduction signal processing circuit 28, the CPU 40, and a program executed by the CPU 40. The recording process and the reproduction process are performed in the same manner as in the first embodiment.
[0106]
As described above, according to the method of manufacturing the optical pickup device according to the second embodiment, the first semiconductor laser 51a and the second semiconductor laser 51a are assembled when the light source unit 51 and the divergence angle adjusting lens 70 are assembled. The first light flux whose divergence angle is enlarged by the negative meniscus lens 70a and the second light flux whose divergence angle is reduced by the positive meniscus lens 70b are sequentially transmitted via the filter 84 by causing the laser 51b to emit light simultaneously. Light is received by the detection light receiving element 82, and the intensity center position of each light beam is detected. If the intensity center positions of the light beams do not match, the mounting position of the divergence angle adjusting lens 70 is corrected so that the intensity center positions of the light beams match. Therefore, it is possible to obtain the same effect as the method of manufacturing the optical pickup device according to the first embodiment.
[0107]
In addition, since the optical pickup device 23 according to the second embodiment is manufactured by the above-described manufacturing method, after passing through the divergence angle adjusting lens 70, the emission direction of the first light beam and the second light beam Are almost coincident with the emission direction. Therefore, the same effect as that of the optical pickup device according to the first embodiment can be obtained.
[0108]
Further, the optical disc device 20 according to the second embodiment includes the optical pickup device in which the generation of the wavefront aberration and the decrease in the light use efficiency of each light beam emitted from the plurality of light sources are suppressed. The same effect as that of the optical disc device according to the first embodiment can be obtained.
[0109]
<< 3rd Embodiment >>
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0110]
In the third embodiment, the first semiconductor laser 51a and the second semiconductor laser 51b simultaneously emit light and the first light flux and the second light beam are emitted during the position correction processing of the divergence angle adjusting lens 70 described above. It is characterized in that a dichroic prism is used as a branching optical element for separating the light beam. The other configurations of the optical pickup device and the optical disk device are the same as those of the first embodiment. Therefore, the following description will focus on the differences from the first embodiment, and the same or equivalent components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be simplified. Or, it shall be omitted.
[0111]
FIG. 12 is a flowchart illustrating a procedure for manufacturing the optical pickup device 23 according to the third embodiment.
[0112]
In the first step 601, the same processing as in step 401 is performed.
[0113]
In the next step 603, first, the collimating lens 81 is arranged in the same manner as in step 403. Next, as shown in FIG. 13A, a dichroic prism 85 is arranged on the −Z side of the collimator lens 81. Here, as an example, the first light flux converted into substantially parallel light by the collimating lens 81 is transmitted through the dichroic prism 85, and the second light flux is reflected by the dichroic prism 85 in the + X direction. Subsequently, a light receiving element for detection 82 for receiving the first light beam transmitted through the dichroic prism 85 is disposed on the −Z side of the dichroic prism 85, and the second light beam reflected in the + X direction by the dichroic prism 85 is reflected by the dichroic prism 85. A light receiving element 86 for detection as a second position detector for receiving light is arranged on the + X side of the dichroic prism 85. Here, each detection light receiving element is arranged at a predetermined position via a U-shaped slide guide formed on the housing. As shown in FIG. 13 (B), the detection light-receiving element 86 includes a four-division light-receiving element (a first partial light-receiving element 86a, a second partial light-receiving element 86b, and a third partial light-receiving element) as in the detection light-receiving element 82. The element 86c and the fourth partial light receiving element 86d) are used. As shown in FIG. 13A, a measurement control device 83 ″ is connected to the detection optical element 82 and the detection optical element 86.
[0114]
As shown in FIG. 14 as an example, the measurement control device 83 ″ can obtain a signal SPx ′ based on the following equation (7) and a signal SPy ′ based on the following equation (8). An adder and a subtractor are added. Here, the signal S86a is a voltage signal converted from the output signal of the first partial light receiving element 86a, the signal S86b is a voltage signal converted from the output signal of the second partial light receiving element 86b, and the signal S86c is the third partial light receiving element. The signal S86d is a voltage signal obtained by converting the output signal of the fourth partial light receiving element 86d. Then, the signal SPx ′ and the signal SPy ′ are output to the correction amount calculation circuit 83h ″ together with the signal SPx and the signal SPy.
[0115]
SPx '= (S86a + S86b)-(S86c + S86d) (7)
[0116]
SPy '= (S86a + S86d)-(S86b + S86c) (8)
[0117]
The other configuration is the same as that of the measurement control device 83. Therefore, hereinafter, the same reference numerals are used for the same or equivalent components as those of the measurement control device 83, and the description thereof will be omitted.
[0118]
In the next step 605, the same processing as in step 405 is performed.
[0119]
Then, it instructs the measurement control device 83 ″ to correct the position of the divergence angle adjusting lens 70. As a result, the measurement control device 83 ″ executes the position correction processing of the following steps 607 to 617.
[0120]
In the next step 607, the first semiconductor laser 51a and the second semiconductor laser 51b are turned on by the correction amount calculation circuit 83h ″, and the first light beam and the second light beam are emitted from the light source unit 51. You. After the divergence angle of the first light beam is expanded by the negative meniscus lens 70 a, the first light beam enters the filter 84 via the collimator lens 81. After the divergence angle of the second light beam is reduced by the positive meniscus lens 70 b, the second light beam enters the dichroic prism 85 via the collimator lens 81. The first light beam transmitted through the dichroic prism 85 is received by the light receiving element 82 for detection. From each of the partial light receiving elements constituting the light receiving element for detection 82, a signal corresponding to the amount of received light is output to the measurement control device 83 ″. Then, the measurement control device 83 ″ calculates the signals SPx and SPy in the same manner as in the first embodiment. On the other hand, the second light beam reflected by the dichroic prism 85 is received by the light receiving element 86 for detection. Each of the partial light receiving elements constituting the light receiving element 86 for detection outputs a signal corresponding to the amount of received light to the measurement control device 83 ″. Then, the measurement control device 83 ″ calculates the signal SPx ′ and the signal SPy ′ as described above.
[0121]
In the next step 609, the coordinates (Px1, Py1) of the intensity center position of the first light beam are obtained by the correction amount calculation circuit 83h ″ based on the signals SPx and SPy.
[0122]
In the next step 611, the coordinates (Px2, Py2) of the intensity center position of the second light flux are obtained by the correction amount calculation circuit 83h '' based on the signals SPx 'and SPy'.
[0123]
In the next steps 613 to 617, the same processing as in the above steps 415 to 419 is performed. Then, the position correction processing of the divergence angle adjusting lens 70 by the measurement control device 83 ″ ends.
[0124]
In the next step 619, the collimator lens 81, the dichroic prism 85, and the light receiving elements for detection 82 and 86 are removed from the optical path. The driving device 88 is also detached from the divergence angle adjusting lens 70.
[0125]
In the next step 621, the same processing as in step 423 is performed, and the manufacture of the optical pickup device 23 ends. At this time, the optical system, the light source unit 51, and the light receiver 59 are assembled in an ideal positional relationship.
[0126]
As is clear from the above description, in the third embodiment, the information acquisition step of the manufacturing method according to the present invention is performed by the processing of steps 603 to 613 in FIG. The correction process is performed by the process of 617.
[0127]
In the optical disc device 20 according to the third embodiment, as in the first embodiment, a processing device is realized by the reproduction signal processing circuit 28, the CPU 40, and the program executed by the CPU 40. The recording process and the reproduction process are performed in the same manner as in the first embodiment.
[0128]
As described above, according to the method of manufacturing the optical pickup device according to the third embodiment, when the light source unit 51 and the divergence angle adjusting lens 70 are assembled, the first semiconductor laser 51 a and the second semiconductor laser 51 a The laser beam is emitted simultaneously with the laser 51b, and the first light beam whose divergence angle is enlarged by the negative meniscus lens 70a and the second light beam whose divergence angle is reduced by the positive meniscus lens 70b are separated by the dichroic prism 85. The first light beam is received by the light receiving element 82 for detection, and the second light beam is received by the light receiving element 86 for detection, and the intensity center position of each light beam is detected. If the intensity center positions of the light beams do not match, the mounting position of the divergence angle adjusting lens 70 is corrected so that the intensity center positions of the light beams match. Therefore, it is possible to obtain the same effect as the method of manufacturing the optical pickup device according to the first embodiment. Further, since the intensity center position of the first light beam and the intensity center position of the second light beam can be obtained almost simultaneously, the position correction processing of the divergence angle adjusting lens 70 can be performed in a short time.
[0129]
Further, since the optical pickup device 23 according to the third embodiment is manufactured by the above-described manufacturing method, after passing through the divergence angle adjusting lens 70, the emission direction of the first light beam and the second light beam Are almost coincident with the emission direction. Therefore, the same effect as that of the optical pickup device according to the first embodiment can be obtained.
[0130]
Further, the optical disc device 20 according to the third embodiment includes the optical pickup device in which the generation of the wavefront aberration and the decrease in the light use efficiency of each light beam emitted from the plurality of light sources are suppressed. The same effect as that of the optical disc device according to the first embodiment can be obtained.
[0131]
In each of the above embodiments, the case where the four-divided light receiving element is used as the light receiving element for detection has been described. However, the present invention is not limited to this. good. In short, it suffices if the position of the intensity center of the light beam can be detected.
[0132]
Further, in each of the above embodiments, the positioning of the light receiving element for detection at a predetermined position is performed through the U-shaped slide guide formed on the housing. However, the present invention is not limited to this. The light receiving element for detection may be positioned at a predetermined position using a tool.
[0133]
Further, in each of the above embodiments, the case where the light emission intensities of the respective semiconductor lasers are substantially equal has been described. Thus, for example, even when the semiconductor lasers emit light at the same time, the center of intensity of each light beam can be obtained almost simultaneously without separating the first light beam and the second light beam. That is, the above-described filter and dichroic prism are not required, and the position correction processing of the divergence angle adjusting lens 70 can be performed at low cost.
[0134]
Further, in each of the above embodiments, the case where the position correction of the divergence angle adjusting lens 70 is automatically performed based on the shift of the intensity center of each light beam has been described. However, the present invention is not limited to this. For example, the intensity center of each light beam is displayed. It may be displayed on a device (monitor), and the operator may correct the position of the divergence angle adjusting lens 70 while looking at it. Thus, it is possible to reliably correct the deviation of each light beam emitted from each semiconductor laser in the emission direction.
[0135]
In each of the above embodiments, the case where a non-polarization beam splitter whose reflectivity does not depend on the polarization direction of the incident light beam is used as the beam splitter 54 is not limited thereto, and the polarization direction of the incident light beam is not limited to this. Polarization beam splitters having different reflectivities depending on the conditions. As a result, the decrease in the amount of light of the light beam irradiated on the recording surface of the optical disk is extremely reduced, and it is easy to cope with high speed. Further, the amount of light received by the light receiver increases, and the signal level and the S / N ratio of the output signal from the light receiver can be improved. Further, a hologram element may be used instead of the beam splitter 54. Thereby, miniaturization of the optical pickup device can be promoted.
[0136]
Further, in each of the above-described embodiments, the case where two lenses are integrated as the divergence angle adjusting lens has been described. However, the present invention is not limited to this, and a lens that adjusts the divergence angle of a light beam emitted from any of the semiconductor lasers. Only one may be provided.
[0137]
Further, in each of the above embodiments, the case where the meniscus lens is used as the divergence angle adjusting lens has been described, but the present invention is not limited to this.
[0138]
Further, in each of the above embodiments, the case where the emission direction of the light beam from the first semiconductor laser and the emission direction of the light beam from the second semiconductor laser are substantially the same has been described. It is only necessary that the outgoing directions of the light beams are substantially the same.
[0139]
In each of the above embodiments, the divergence angle adjustment lens and the light source unit may be integrated after the position of the divergence angle adjustment lens is corrected.
[0140]
Further, in each of the above-described embodiments, the case where the collimating lens 81 that converts the light flux passing through the divergence angle adjusting lens 70 into substantially parallel light is used is described. However, for example, the divergence angle adjusting lens 70 and the detecting light-receiving element 82 In this case, the collimating lens 81 need not be provided.
[0141]
Further, in each of the above embodiments, the case where the position correction processing of the divergence angle adjustment lens 70 is performed immediately after the divergence angle adjustment lens 70 is mounted has been described, but the present invention is not limited to this. For example, the position correction processing of the divergence angle adjusting lens 70 may be performed after the assembly of the optical system is completed. In short, it is sufficient if the divergence angle adjusting lens 70 is mounted.
[0142]
In each of the above embodiments, the case where the light source that emits a light beam having a wavelength of 650 nm and the light source that emits a light beam having a wavelength of 780 nm is described, but the present invention is not limited to this. Instead of any one of the light sources, for example, a light source that emits a light beam having a wavelength of 405 nm may be used. Further, three or more light sources may be provided.
[0143]
In each of the above embodiments, the optical disk device capable of recording and reproducing information has been described. However, the present invention is not limited to this, and any optical disk device capable of at least reproducing, among recording, reproducing, and erasing information, may be used.
[0144]
In each of the above embodiments, at least a part of the processing device realized by processing according to the program by the CPU 40 may be configured by hardware, or all of the processing device may be configured by hardware.
[0145]
【The invention's effect】
As described above, according to the method of manufacturing an optical pickup device according to the present invention, there is an effect that a deviation in the emission direction of each light beam emitted from a plurality of light sources can be accurately corrected.
[0146]
Further, according to the pickup device of the present invention, there is an effect that it is possible to suppress the generation of the wavefront aberration and the decrease in the light use efficiency due to the shift in the emission direction of each light beam emitted from the plurality of light sources.
[0147]
Further, according to the optical disc device of the present invention, it is possible to cope with a plurality of types of information recording media, and it is possible to accurately and stably access each information recording medium at a high speed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an optical disc device according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining a configuration of the optical pickup device according to the first embodiment.
FIG. 3 is a diagram for explaining two semiconductor lasers mounted on the light source unit 51 of FIG. 2;
FIG. 4 is a view for explaining a divergence angle adjusting lens 70 in FIG. 2;
FIG. 5 is a flowchart for explaining a procedure for manufacturing the optical pickup device according to the first embodiment.
6A is a diagram showing a state in which the processing of step 405 in FIG. 5 is completed, and FIG. 6B is a view showing a slide guide for fixing the detection light receiver 82 at a predetermined position. It is a perspective view for explaining.
FIG. 7 is a view for explaining a configuration of a detection light receiver 82 in FIG. 2;
FIG. 8 is a block diagram for explaining details of a measurement control device 83 in FIG. 2;
FIG. 9 is a flowchart for explaining a procedure for manufacturing the optical pickup device according to the second embodiment.
10A is a diagram showing a state in which step 505 in FIG. 9 has been completed, and FIG. 10B is a diagram for explaining a filter 84;
FIG. 11 is a block diagram illustrating details of a measurement control device 83 ′ in FIG. 10;
FIG. 12 is a flowchart for explaining a procedure for manufacturing the optical pickup device according to the third embodiment.
13A is a diagram showing a state in which step 605 in FIG. 12 has been completed, and FIG. 13B is a diagram for explaining a light receiving device 86 for detection.
FIG. 14 is a block diagram for explaining details of a measurement control device 83 ″ in FIG. 13;
FIG. 15 is a diagram for explaining a positional relationship between an intensity distribution of a light beam emitted from a semiconductor laser and an active layer.
[Explanation of symbols]
15 optical disk (information recording medium), 20 optical disk device, 23 optical pickup device, 28 reproduction signal processing circuit (part of processing device), 40 CPU (part of processing device), 51a first Semiconductor laser (light source), 51b second semiconductor laser (light source), 52 ... collimating lens (part of optical system), 54 ... beam splitter (part of optical system), 60 ... objective lens (part of optical system) Part), 70: divergence angle adjusting lens (adjusting optical element), 70a: negative meniscus lens (part of adjusting optical element), 70b: positive meniscus lens (part of adjusting optical element), 81: collimating lens (optical element) ), 82: detection light receiver (position detector, first position detector), 84: filter, 85: dichroic prism (branch optical element), 86: detection light receiver (second position detection) ).

Claims (12)

At least two light sources including at least two specific light sources arranged close to each other, and an adjusting optical element for adjusting a divergence angle of each light beam emitted from the at least two specific light sources, respectively, and emitted from each of the light sources. For producing an optical pickup device including an optical system for guiding each light beam to a recording surface of a corresponding information recording medium and guiding a return light beam reflected on the recording surface to a predetermined light receiving position. And
An information acquisition step of emitting a light beam from each of the at least two specific light sources and acquiring information on an emission direction of each light beam that has passed through the adjustment optical element; and the adjustment optics based on the acquired information on the emission direction. A correcting step of correcting the position of the element and making the emission directions of the respective light beams passing through the adjusting optical element substantially coincide with each other. 2. The method of manufacturing an optical pickup device according to claim 1, further comprising a step of arranging an optical element for converting the light beam into substantially parallel light on an optical path of the light beam having passed through the adjustment optical element. The at least two specific light sources include a first light source and a second light source;
3. The method according to claim 1, wherein, in the information acquiring step, the first light source and the second light source emit light simultaneously. 4. 4. The method according to claim 3, wherein, in the information acquiring step, a light emission intensity of the first light source and a light emission intensity of the second light source are different from each other. 5. One of a first filter for selectively transmitting a light beam emitted from the first light source and a second filter for selectively transmitting a light beam emitted from the second light source, 4. The method according to claim 3, further comprising the step of arranging the light beam emitted from the second light source on the optical path of the light beam. The method of manufacturing an optical pickup device according to claim 1, wherein in the information obtaining step, a position detector that detects a light receiving position of a light beam that has passed through the adjustment optical element is used. A branch optical element that transmits a light beam emitted from the first light source and reflects a light beam emitted from the second light source on an optical path of the light beam that has passed through the adjustment optical element; Further comprising: arranging a first position detector at a light receiving position of the light beam transmitted through the element, and arranging a second position detector at a light receiving position of the light beam reflected by the branch optical element;
In the information acquiring step, information on an emission direction of a light beam emitted from the first light source is acquired using the first position detector, and the second light source is acquired using the second position detector. The method for manufacturing an optical pickup device according to claim 3, wherein information on an emission direction of a light beam emitted from the optical pickup is acquired. The method according to claim 1, wherein, in the information acquiring step, the specific light sources emit light sequentially. The method for manufacturing an optical pickup device according to claim 1, further comprising a step of displaying information on the obtained emission direction. The method of manufacturing an optical pickup device according to claim 1, wherein the adjustment optical element is a meniscus lens. An optical pickup device manufactured by the method for manufacturing an optical pickup device according to claim 1. An optical disc device that performs at least reproduction of information recording, reproduction, and erasure on an information recording medium,
An optical pickup device according to claim 11,
An optical disc device comprising: a processing device that performs at least reproduction among recording, reproduction, and erasure of the information by using an output signal of the optical pickup device.

Images