JP2006209906A - Manufacturing method of optical head device and its manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical head device and its manufacturing apparatus, in which no large scale facility and great amount of work are required to adjust the relative position between a laser light source and a light receiving element, and also highly reliable adjustment is always made. <P>SOLUTION: In the manufacturing process of an optical head device 1, no actual optical recording disk is used even though the location of a light receiving element 25 is adjusted using a second laser light source 12 as a reference, a pseudo-disk constituted of a mirror is arranged at the location corresponding to an optical recording disk 4 and the relative position between the second laser light source 12 and the light receiving element 25 is adjusted according to the detection result at the light receiving element 25 of the returning light beams from a pseudo-disk 143. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical head device manufacturing method and a manufacturing apparatus thereof. More particularly, the present invention relates to a technique for adjusting the relative position of a laser light source and a light receiving element used in an optical head device.

  In general, an optical head device guides light emitted from a laser light source, a light receiving element, an objective lens, and a laser light source to the objective lens, and guides return light from an optical recording disk passing through the objective lens to the light receiving element. And an optical system. Here, the light guide system includes a collimating lens, and light emitted from the laser light source is guided to the objective lens as collimated light.

  In manufacturing the optical head device having such a configuration, it is necessary to adjust the relative position between the laser light source and the light receiving element, and in the adjustment process therefor, as in the conventional optical head device as a finished product, the laser light source The laser light is emitted from the optical recording disk to form a spot on the recording surface of the rotating optical recording disk, and the return light from the optical recording disk is detected by the light receiving element. Based on the detection result, the laser light source The relative position with respect to the light receiving element is adjusted.

  However, as in the prior art, in the method of rotating the optical recording disk and adjusting the relative position between the laser light source and the light receiving element by actually moving the optical head device, the driving device of the optical recording disk and the tilt (tilt) of the optical disk are used. ) It is necessary to prepare mechanisms and circuits such as an adjustment mechanism, a focus servo circuit, and a track servo circuit for each model of the optical head device, which requires a large capital investment. Also, the servo circuit needs to be tuned with great effort every time the model of the optical head device is changed. In addition, the optical recording disk used for the test needs to be managed to always prevent scratches and dust from being attached, and there is a problem that the reliability of adjustment is lowered when the optical recording disk is damaged.

  In view of the above problems, the problem of the present invention is that adjustment of the relative position between the laser light source and the light receiving element does not require large-scale equipment and a great deal of trouble, and always provides highly reliable adjustment. An object of the present invention is to provide an optical head device manufacturing method and an apparatus for manufacturing the same.

  In order to solve the above-described problem, the present invention includes a laser light source, a light receiving element, an objective lens, and a collimator lens that guides emitted light from the laser light source as collimated light to the objective lens, and passes through the objective lens. In the method of manufacturing an optical head device having a light guide system for guiding return light from the optical recording disk to the light receiving element, in the adjustment step of adjusting the relative position between the laser light source and the light receiving element, the optical recording A pseudo disk composed of a mirror is disposed at a position corresponding to the disk, and a laser beam is emitted from the laser light source in a state where an imaging lens is disposed between the pseudo disk and the light guide system to the pseudo disk. A spot is formed, and the laser light source and the light receiver are received based on the detection result of the return light from the pseudo disk by the light receiving element. And adjusting the relative position of the element.

  The present invention includes a laser light source, a light receiving element, an objective lens, and a collimating lens that guides light emitted from the laser light source to the objective lens as collimated light, and returns from the optical recording disk that passes through the objective lens. An optical head device manufacturing apparatus used in an adjustment step of adjusting a relative position between the laser light source and the light receiving element among manufacturing steps of an optical head device having a light guide system that guides light to the light receiving element, A pseudo disk composed of a mirror on which a spot of laser light emitted from the laser light source is formed at a position corresponding to the optical recording disk, and the return light from the pseudo disk is detected by the light receiving element. Features.

  In the present invention, a pseudo disk made of a mirror is disposed at a position corresponding to the optical recording disk without using an actual optical recording disk, and the laser light source and the light source are detected based on the detection result of the return light from the pseudo disk by the light receiving element. In order to adjust the relative position with respect to the light receiving element, a mechanism or circuit such as an optical recording disk drive device, an optical disk tilt adjustment mechanism, a focus servo circuit, or a track servo circuit is not necessary when performing the adjustment process. . Therefore, even when the model of the optical head device is changed, it is not necessary to tune the servo circuit with much effort. In addition, since it is not necessary to use an optical recording disk that is likely to be damaged or dust attached in the adjustment process, highly reliable adjustment can always be performed.

  In the present invention, when performing the adjustment step, it is preferable that a lens having a longer focal point than the objective lens is disposed as the imaging lens between the pseudo disk and the light guide system.

  In this invention, when performing the said adjustment process, it is preferable to arrange | position the said objective lens as said imaging lens between the said pseudo | simulation disk and the said light guide system.

  In this case, when performing the adjustment step, a translucent plate having a thickness corresponding to the thickness of the transparent protective layer formed on the surface of the recording layer in the optical recording disc is interposed between the imaging lens and the pseudo disc. It is preferable to arrange in.

  Here, the optical head device is a long wavelength laser for recording and / or reproducing the first optical recording disk having a thick transparent protective layer formed on the surface of the recording layer as the laser light source. A first laser light source that emits light, and a short wavelength for recording and / or reproduction of a second optical recording disk in which the transparent protective layer is thinner than the first optical recording disk. In the case of including a second laser light source that emits laser light, the objective lens has an aberration corresponding to the thickness of the transparent protective layer of the first optical recording disk and the second optical recording disk. Has been.

  Therefore, when performing the adjustment step, when adjusting the relative position between the first laser light source and the light receiving element, and when adjusting the relative position between the second laser light source and the light receiving element. Then, it is preferable to dispose translucent plates having different thicknesses between the imaging lens and the pseudo disk. Alternatively, when performing the adjustment step, a plurality of light-transmitting plates are prepared, and the relative position between the first laser light source and the light receiving element is adjusted, and the second laser light source and the When adjusting the relative position with respect to the light receiving element, different numbers of the light transmitting plates may be arranged between the imaging lens and the pseudo disk. Alternatively, when performing the adjustment step, a light-transmitting plate having a different thickness depending on a region is prepared, and the relative position between the first laser light source and the light receiving element is adjusted, and the second laser When adjusting the relative position of the light source and the light receiving element, the region of the light transmitting plate located between the imaging lens and the pseudo disk may be different.

  In the present invention, it is preferable that a half mirror that partially transmits laser light is used as the pseudo disk, and a pseudo disk observation device that observes spots formed on the pseudo disk from the back side of the pseudo disk. That is, as the pseudo disk, a half mirror that partially transmits laser light is used, and a pseudo disk observation device that observes a spot formed on the pseudo disk from the back side of the pseudo disk is disposed. It is preferable that the relative position between the pseudo disk and the imaging lens is adjusted based on the observation result at.

  In the present invention, the adjustment step may be performed in a state where the pseudo disk is shifted from the focused position of the laser light in consideration of aberration.

  In the present invention, a pseudo disk composed of a mirror is disposed at a position corresponding to the optical recording disk, and the relative position between the laser light source and the light receiving element is adjusted based on the detection result of the return light from the pseudo disk by the light receiving element. Therefore, when such an adjustment process is performed, mechanisms and circuits such as an optical recording disk drive device, an optical disk tilt adjustment mechanism, a focus servo circuit, and a track servo circuit are unnecessary. Therefore, even when the model of the optical head device is changed, it is not necessary to tune the servo circuit with much effort. In addition, since it is not necessary to use an optical recording disk that is likely to be damaged or dust attached in the adjustment process, highly reliable adjustment can always be performed.

  Embodiments of the present invention will be described with reference to the drawings.

[Schematic configuration of optical head device]
FIG. 1 is an explanatory view showing the main part of the optical system of the optical head device. In FIG. 1, an optical head device 1 according to the present embodiment reproduces and records information on a plurality of types of optical recording disks 4 having different substrate thicknesses and recording densities, such as CDs, CD-Rs, and DVDs. For this purpose, the optical head device 1 includes a first laser light source 11 that emits a first laser L1 having a central wavelength of 785 nm used for recording and reproduction of a first optical recording disk such as a CD, and a second laser light such as a DVD. And a second laser light source 12 that emits a second laser L2 having a wavelength of 655 nm that is used for recording and reproduction of the optical recording disk. The laser beams L1 and L2 are guided to a common objective lens 3 through a common light guide system Lo, and are condensed on the optical recording disk 4 by the objective lens 3 and reflected by the optical recording disk 4. The return light of the light beam is guided to the common light receiving element 25 through the objective lens 3 and the light guide system Lo. In the optical head device 1 configured as described above, each optical element is mounted on a common device frame (not shown). The objective lens 3 is mounted on the device frame via an objective lens driving device (not shown).

  In the light guide system Lo, the first beam splitter 21 is configured to cause the first laser L1 to travel straight and reflect the second laser L2 so that both lights coincide with the system optical axis L (the optical axis of the objective lens). A second beam splitter 22 that passes the lasers L1 and L2 traveling along the system optical axis L, and a collimator lens 23 that collimates the laser beams L1 and L2 that have passed through the second beam splitter 22. include. An aperture 26 is disposed in front of the objective lens 3.

  The laser light beams L1 and L2 are guided to the objective lens 3 by such a light guide system Lo. Then, the objective lens 3 forms a beam spot of the first laser beam L1 on the recording surface 41a of the CD 41 as the first optical recording disk 4, and the recording surface of the DVD 42 as the second optical recording disk 4 A beam spot of the second laser beam L2 is formed on the recording surface of the DVD 42 with respect to 42a.

  The first and second laser beams L1 and L2 collected on the optical recording disk 4 (CD41, DVD42) are reflected by the optical recording disk 4 and then returned to the common condensing optical system Lo. , The light beam is reflected by the second beam splitter 22 and condensed on the light receiving element 25. Then, information reproduction of the optical recording disk 4 (CD41, DVD42) is performed by a signal detected by the light receiving element 25. A sensor lens 27 is disposed between the light receiving element 25 and the second beam splitter 22. Further, a grating 28 is disposed between the first beam splitter 21 and the first laser light source 11, and a grating 29 is disposed between the first beam splitter 21 and the second laser light source 12. Yes.

  In the optical head device 1 of the present embodiment, the objective lens 3 includes an incident-side refracting surface having a positive power on which the laser beams L1 and L2 emitted from the first laser light source 11 and the second laser light source 12 are incident. A convex lens having an exit-side refractive surface that emits a laser beam toward the optical recording disk 4. In the objective lens 3, for example, the incident side refracting surface surrounds the circular center side refracting surface region including the optical axis L concentrically with the optical axis L as a center, and the outer periphery of the center side refracting surface region in an annular shape. The outer peripheral side refractive surface region is divided into two, and the boundary portion between the center side refractive surface region and the outer peripheral side refractive surface region is a position corresponding to NA = 0.45 to 0.55. In addition, a center side diffraction grating is formed by a plurality of concentric fine steps over the entire area of the center side refracting surface region, and the center side diffraction grating is a first laser beam that passes through the region. The beam spot of the diffracted beam of L1 is formed on the recording surface of the CD 41, and the beam spot of the diffracted beam of the second laser beam L2 passing through the region is formed on the recording surface of the DVD 42. Has diffraction characteristics. On the other hand, the outer peripheral side refracting surface area of the objective lens 3 has a refracting power that forms a beam spot of a light beam portion passing through the area in the second laser light L2 on the recording surface of the DVD 42.

[Method for Manufacturing Optical Head Device 1]
In manufacturing the optical head device 1 configured as described above, in this embodiment, first, after the light guide system Lo is mounted on the device frame, the second laser light source 12 is mounted, and then the first position. After adjusting the positions of the sensor lens 27 and the light receiving element 25 with the second laser light source 12 as a reference in the adjustment step, the first laser light source with reference to the second laser light source 12 in the second position adjustment step. 11 position adjustment is performed. Therefore, after describing the position adjustment method of the sensor lens 27 and the light receiving element 26 in the first position adjustment process and the first position adjustment device (optical head device manufacturing apparatus) used therefor, the second position is described below. A method for adjusting the position of the second laser light source 12 in the adjustment process and a second position adjusting device (optical head device manufacturing apparatus) used therefor will be described. In the following description, the direction along the optical axis L of the laser beam is the Z direction, and two directions perpendicular to the Z direction are the XY directions.

(First position adjusting device and first position adjusting step)
2 and 3 are an explanatory view showing the configuration of a first position adjusting device (optical head device manufacturing apparatus) to which the present invention is applied, and an explanatory view showing the main part thereof. FIG. 4 is an explanatory view showing a state of a product in the middle of manufacturing when the position adjustment operation is performed by the first position adjustment device shown in FIG.

  In FIG. 2, the first position adjusting device 100 of the present embodiment includes a sample stage 110 for installing an intermediate product 1 ′ on which a light guide system Lo and a second laser light source 12 are mounted on a device frame, A power supply 190 for driving the two laser light sources 12, a signal processing circuit 180 for processing an output signal from the light receiving element 25, a low-magnification imaging device 120 arranged toward the product 1 ′ being manufactured, It has a magnification imaging device 130, a pseudo disk imaging device 140, and an image processing device 150 that performs image processing on data obtained from these.

  First, the low-magnification imaging device 120 is a laser autocollimator provided with a collimating light source 121 and an aperture 122, and measures parallelism at a light beam angle of about ± 2 ° with reference to the laser light emitted from the collimating light source 121. This is used to adjust the orientation of the sample table 110. The low-magnification imaging apparatus 120 includes a filter 123, a lens 124, and an imaging element 125, and also includes a deflection element 126 such as a mirror or a half mirror that constitutes each optical path. Note that a power supply 128 for driving the collimated light source 121 is provided for the low-magnification imaging device 120.

  The high-magnification imaging device 130 includes a filter 131, an imaging lens 132, a monitor light receiving element 133, and an imaging element 134, and is a collimator for confirming the angle and parallelism of substantially collimated light. Note that the high-magnification imaging device 130 also includes a deflection element 136 formed of a half mirror.

  As shown in FIGS. 2 and 3, the pseudo disk imaging device 140 (pseudo disk observation device) includes a beam splitter 141, an imaging lens 142 provided with an aperture 149, a pseudo disk 143, a microscope objective lens 144, a filter 145, and a microscope. An imaging lens 146 and an image sensor 147 are provided. Here, the pseudo disk 143 is composed of a half mirror capable of partially transmitting laser light. As described later, the objective lens 3 of the optical head device 1 can be used as the imaging lens 142. In this embodiment, a lens having a focal length longer than that of the objective lens 3 is used.

  In the first position adjustment apparatus 100 configured as described above, the imaging results of the imaging apparatuses 120, 130, and 150 are output to the image processing apparatus 150. The image processing apparatus 150 is stored in a ROM or the like. A data processing device 159 that performs operations such as data processing based on a stored predetermined program, and a display device 155 that displays a processing result in the data processing device 159 are provided. Here, the display device 155 includes four display areas 151, 152, 153, and 154. In the first display area 151, a high-magnification image obtained by the high-magnification imaging device 130 is displayed. In the second display area 152, a low-magnification image or the like obtained by the low-magnification imaging device 120 is displayed, and in the third display area 153, a signal processing result (PDIC signal) in the signal processing circuit 180 is displayed. In the display area 154 of No. 4, an image obtained by the pseudo disk imaging device 140 is displayed. The image processing apparatus 150 also includes camera power supplies 161, 162, and 163 for the imaging apparatuses 120, 130, and 150.

  In adjusting the relative positions of the second laser light source 12, the sensor lens 27, and the light receiving element 25 by using the first position adjusting device 100 configured as described above, first, in this embodiment, as shown in FIG. As described above, the in-manufactured product 1 ′ having the light guide system Lo and the second laser light source 12 mounted on the apparatus frame is placed on the sample stage 110, and collimated light emitted from the collimated light source 121 of the low-magnification imaging apparatus 120. The orientation of the sample stage 110 is adjusted based on the above. At this time, the sensor lens 127 and the light receiving element 25 are only held by a predetermined jig and are not fixed on the apparatus frame.

  Next, when the second laser light source 12 is turned on, the light emitted from the second laser light source 12 is emitted toward the pseudo disk 143 of the pseudo disk imaging device 140 through the light guide system Lo. At this time, since the objective lens 3 is not mounted, the light emitted from the in-manufacturing product 1 ′ is substantially collimated light emitted from the collimating lens 23, but this collimated light is transmitted by the imaging lens 142. It converges to the pseudo disk 143. Note that the angle and parallelism of the substantially collimated light emitted from the collimating lens 23 is observed by the high-magnification imaging device 130, and the position of the second laser light source 12 and the like are adjusted based on the observation result.

  Next, in the pseudo disk imaging device 140, the imaging element 147 images the spot formed on the pseudo disk 143 from the back side of the pseudo disk 143, and the imaging result is displayed in the fourth display area 154 of the display device 155. Is displayed. Therefore, in this embodiment, the relative position between the imaging lens 142 and the pseudo disk 143 is adjusted while viewing the image displayed in the fourth display area 154, and the collimated light emitted from the collimating lens 23 is converted to the pseudo disk 143. Focus on above.

  When the second laser light source 12 and the pseudo disk 143 are arranged in a conjugate state in this way, the pseudo disk 143 is located at a position corresponding to the optical recording disk 4. This is the same as the state in which recording or reproduction of the optical recording disk 4 is performed. Therefore, the return light from the pseudo disk 143 is guided while converging on the light receiving element 25.

  Therefore, the position of the light receiving element 25 (X direction, Y direction and Z direction) is adjusted, and the detection signal at the light receiving element 25 is in a predetermined condition (signals Px and Py indicating deviation from the optical axis, and the optical axis direction). When the positions of the sensor lens 27 and the light receiving element 25 are adjusted so that any of the signals EF representing the deviation of the second light source EF becomes 0), the second laser light source 12, the pseudo disk 143, and the light receiving element 25 in the optical axis direction. Are arranged in a conjugate state, and this state is the same as the state in which the optical head device 1 is completed. Therefore, after such adjustment, the sensor lens 27 and the light receiving element 25 are bonded and fixed to the apparatus frame.

  As described above, in this embodiment, even when the position of the light receiving element 25 is adjusted with the second laser light source 12 as a reference, the actual optical recording disk 4 is not used and the mirror is positioned at a position corresponding to the optical recording disk 4. And the relative position between the second laser light source 12 and the light receiving element 25 is adjusted based on the detection result of the return light from the pseudo disk 143 by the light receiving element 25. For this reason, when performing such an adjustment process, mechanisms and circuits such as a drive device for the optical recording disk 4, a tilt adjustment mechanism for the optical recording disk 4, a focus servo circuit, and a track servo circuit are unnecessary. Therefore, even when the model of the optical head device 1 is changed, it is not necessary to tune the servo circuit with much effort. In addition, since it is not necessary to use the optical recording disk 4 that is easily damaged or dust attached in the adjustment process, it is possible to always perform adjustment with high reliability.

  In this embodiment, the objective lens 3 of the optical head device 1 can be used as the imaging lens 142. However, in this embodiment, a lens having a long focal length is used. Can be handled. Therefore, it is not easily affected by the aberration of the pseudo disk 143 and other optical elements. Further, since the focal depth of the spot is deep, the focus adjustment accuracy can be lowered, so that an aberration phase difference plate is unnecessary. Further, there is an advantage that the same configuration can be used for both the adjustment of the second laser light source 12 and the adjustment of the first laser light source 11.

(Second position adjusting device and second position adjusting step)
FIG. 5 is an explanatory diagram showing a configuration of a second position adjusting device to which the present invention is applied. FIG. 6 is an explanatory diagram showing a state of an intermediate product when the position adjustment operation is performed by the second position adjustment device shown in FIG.

  In FIG. 5, the second position adjusting device 200 of the present embodiment is configured as a separate device by adding parts to the first position adjusting device 100 described with reference to FIG. Its basic configuration is the same as that of the first position adjusting device 100. That is, the second position adjusting device 200 includes a sample stage 210 for installing a light-emitting system Lo, the second laser light source 12 and the intermediate product 1 ″ having the first laser light source 11 mounted on the device frame. A power source 291 for driving the first laser light source 11, a power source 292 for driving the second laser light source 12, a signal processing circuit 280 for processing an output signal from the light receiving element 25, and manufacturing A low-magnification imaging device 220, a high-magnification imaging device 230, a power distribution imaging device 270, and a pseudo disk imaging device 240 that are arranged toward the intermediate product 1 ″, and an image processing device 250 that performs image processing on data obtained therefrom. have. An aperture 212 is arranged on the sample stage 210.

  The low-magnification imaging device 220 is a laser autocollimator provided with a collimated light source 221 and an aperture 222, and measures the parallelism at a light beam angle of about ± 2 ° with reference to the laser light emitted from the collimated light source 221. It is used to adjust the orientation of the table 210. The low-magnification imaging apparatus 220 includes a filter 223, a lens 224, and an imaging element 225, and also includes a deflection element 226 such as a mirror or a half mirror that forms each optical path. Note that a power supply 228 for driving the collimated light source 221 is provided for the low-magnification imaging device 220.

  The high-magnification imaging device 230 includes a filter 231, an imaging lens 232, a monitor light receiving element 233, and an imaging element 234, and is a collimator for confirming the angle and parallelism of substantially collimated light. Note that the high-magnification imaging device 230 also includes a deflection element 236 formed of a half mirror.

  The power distribution imaging device 270 includes a beam splitter 271, a monitor light receiving element 272, a filter 273, an imaging lens 274, an extension tube 275, and an imaging element 276. Note that the power distribution imaging device 270 also includes a deflection element 277 made of a half mirror.

  The pseudo disk imaging device 240 includes a beam splitter 241, an imaging lens 242 provided with an aperture (see FIG. 3), a pseudo disk 243, a microscope objective lens 244, a filter 245, a microscope imaging lens 246, and an imaging device 247. Yes. Here, the pseudo disk 243 is composed of a half mirror capable of partially transmitting laser light. As described later, the objective lens 3 of the optical head device 1 can be used as the imaging lens 242, but in this embodiment, a lens having a longer focal length than the objective lens 3 is used.

  In the second position adjustment device 200 configured as described above, the imaging results of the imaging devices 220, 230, 250, and 270 are output to the image processing device 250. The image processing device 250 is a ROM. A data processing device 259 that performs operations such as data processing based on a predetermined program stored in the data processing device 259, and a display device 255 that displays processing results in the data processing device 259 and the like. Here, the display device 255 includes four display areas 251, 252, 253, and 254. In the first display area 251, a high-magnification image obtained by the high-magnification imaging device 230 is displayed. In the second display area 252, a low-magnification image or the like obtained by the low-magnification imaging device 220 is displayed. In the third display area 253, the signal processing result (PDIC signal) in the signal processing circuit 280 is displayed. 4, an image obtained by the pseudo disk imaging device 240 is displayed. The image processing apparatus 150 also includes camera power supplies 261, 262, 263, and 264 for the imaging apparatuses 220, 230, 250, and 270.

  When the relative position between the first laser light source 11 and the light receiving element 25 is adjusted using the second position adjusting device 200 configured as described above, in this embodiment, as shown in FIG. An in-manufactured product 1 ″ equipped with the light guide system Lo, the first laser light source 11, and the second laser light source 12 is placed on the sample stage 210 and collimated from the collimated light source 221 of the low-magnification imaging device 220. The direction of the sample stage 210 is adjusted based on the light, etc. At this time, the second laser light source 12, the sensor lens 227, the light receiving element 12, and the like are fixed on the apparatus frame. Is only held by a jig or the like and is not fixed on the apparatus frame.

  Next, when the first laser light source 11 is turned on, the light emitted from the first laser light source 11 is emitted toward the pseudo disk 243 of the pseudo disk imaging device 240 through the light guide system Lo. At this time, since the objective lens 3 is not mounted, the light emitted from the in-manufacturing product 1 ″ is substantially collimated light emitted from the collimating lens 23, but this collimated light is transmitted by the imaging lens 242. It converges on the pseudo disk 243.

  Next, in the pseudo disk imaging device 240, the imaging element 247 images the spot formed on the pseudo disk 243 from the back side of the pseudo disk 243, and the imaging result is displayed in the fourth display area 254 of the display device 255. Is displayed. Therefore, in this embodiment, the relative position between the imaging lens 242 and the pseudo disk 243 is adjusted while viewing the image displayed in the fourth display area 254, and the collimated light emitted from the collimating lens 23 is converted to the pseudo disk 243. Focus on above. At this time, since it is necessary to adjust the power distribution of the first laser light source 11, the light beam emitted through the aperture 212 is transmitted by the high-magnification imaging device 230, the low-magnification imaging device 220, and the power distribution imaging device 270. The image is picked up, and the image pickup result (spot and power distribution) is displayed in the second display area 252 and the third display area 253, while the spot is included in the image of the first display area 251 picked up by the high magnification image pickup device 230. Adjust the power distribution so that appears.

  When the first laser light source 11 and the pseudo disk 143 are arranged in a conjugate state in this way, the pseudo disk 243 is located at a position corresponding to the optical recording disk 4. This is the same as the state in which recording or reproduction of the optical recording disk 4 is performed. Therefore, the return light from the pseudo disk 243 is guided to the light receiving element 25 while converging.

  Therefore, the position of the first laser light source 11 (X direction, Y direction, Z direction, tilt angle θx in the X direction and tilt angle θy in the Y direction is set so that the detection signal at the light receiving element 25 satisfies a predetermined condition. ) Is adjusted, the first laser light source 11, the second laser light source 12, the pseudo disk 143, and the light receiving element 25 are arranged in a conjugate state in the optical axis direction. 1 is the same as the completed state. Therefore, after performing such adjustment, the first laser light source 11 is bonded and fixed to the apparatus frame.

  As described above, in this embodiment, even when the position of the first laser light source 11 is adjusted based on the light receiving element 25, the actual optical recording disk is not used but the optical recording disk 4 is used. A pseudo disk 243 composed of a mirror is disposed at a corresponding position, and the relative position between the first laser light source 11 and the light receiving element 25 is adjusted based on the detection result of the return light from the pseudo disk 243 by the light receiving element 25. . For this reason, when performing such an adjustment process, mechanisms and circuits such as a drive device for the optical recording disk 4, a tilt adjustment mechanism for the optical recording disk 4, a focus servo circuit, and a track servo circuit are unnecessary. Therefore, even when the model of the optical head device 1 is changed, it is not necessary to tune the servo circuit with much effort. In addition, since it is not necessary to use the optical recording disk 4 that is easily damaged or dust attached in the adjustment process, it is possible to always perform adjustment with high reliability.

  In this embodiment, the objective lens 3 of the optical head device 1 can be used as the imaging lens 242. However, in this embodiment, since a lens having a long focal length is used, the light flux can be obtained with a small NA. Can be handled. Therefore, it is difficult to be influenced by the aberration of the pseudo disk 143 and other optical elements. Further, since the focal depth of the spot is deep, the focus adjustment accuracy can be lowered, so that an aberration phase difference plate is unnecessary. Further, there is an advantage that the same configuration can be used for both the adjustment of the second laser light source 12 and the adjustment of the first laser light source 11.

(Modification of position adjusting device and position adjusting process)
In the above embodiment, when performing the adjustment process, a lens having a longer focal point than the objective lens 3 is used as the imaging lenses 142 and 242 between the pseudo disk 143 and the light guide system Lo of the products 1 ′ and 1 ″ being manufactured. As shown in FIGS. 7A and 7B, the objective lens 3 is arranged as an imaging lens between the pseudo disks 143 and 243 and the light guide system Lo of the intermediate products 1 ′ and 1 ″. May be. As described above, when the objective lens 3 is used as the imaging lenses 142 and 242 with respect to the pseudo disks 143 and 243, the relative position between the first laser light source 11 and the light receiving element 25, and the second in a situation close to actual operation. The relative position between the laser light source 12 and the light receiving element 25 can be adjusted.

  However, since the objective lens 3 has a short focal point and is shared between the CD 41 and the DVD 42, an aberration corresponding to the thickness of the transparent protective layer of the optical recording disk 4 is given. Therefore, when the objective lens 3 is used as an imaging lens for the pseudo disks 143 and 243, when the relative position between the second laser light source 12 and the light receiving element 25 is adjusted, the thickness corresponding to the transparent protective layer of the DVD 42 is used. It is preferable to arrange the translucent plate as the aberration correction plate 50. Further, when the relative position between the second laser light source 42 and the light receiving element 25 is adjusted, and when the relative position between the first laser light source 41 and the light receiving element 25 is adjusted, the transparent portions having different thicknesses are used. An optical plate (aberration correction plate 50) is disposed between the objective lens 3 (imaging lens) and the pseudo disks 143 and 243.

  Further, when performing the adjustment process, a plurality of light-transmitting plates are prepared, and the relative position between the first laser light source 41 and the light receiving element 25 is adjusted, and the second laser light source 42 and the light receiving element. When adjusting the relative position with respect to 25, a different number of translucent plates are arranged between the objective lens 3 (imaging lens) and the pseudo disks 143 and 243, and these are arranged as the aberration correction plate 50. May be.

  Furthermore, a translucent plate (aberration correction plate 50) having a different thickness depending on the region is prepared, and the relative position between the first laser light source 41 and the light receiving element 25 is adjusted, and the second laser light source. When the relative position between the light receiving element 42 and the light receiving element 25 is adjusted, the region of the light transmitting plate (aberration correction plate 50) positioned between the objective lens 3 (imaging lens) and the pseudo disk 143 is made different. Also good.

  In the above embodiment, the pseudo disk is arranged at the laser beam in-focus position. However, the adjustment process may be performed in a state where the pseudo disk is shifted from the laser beam in-focus position in consideration of aberration.

It is explanatory drawing which shows the principal part of an optical head apparatus. It is explanatory drawing which shows the structure of the 1st position adjustment apparatus (optical head apparatus manufacturing apparatus) to which this invention is applied. It is explanatory drawing which shows the principal part of the 1st position adjustment apparatus (optical head apparatus manufacturing apparatus) to which this invention is applied. It is explanatory drawing which shows the mode of the product in the middle of manufacture at the time of performing position adjustment operation with the 1st position adjustment apparatus to which this invention is applied. It is explanatory drawing which shows the structure of the 2nd position adjustment apparatus (optical head apparatus manufacturing apparatus) to which this invention is applied. It is explanatory drawing which shows the mode of the product in the middle of manufacture at the time of performing position adjustment operation | work with the 2nd position adjustment apparatus to which this invention is applied. It is explanatory drawing which shows the structure of another position adjustment apparatus to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical head apparatus 1 ', 1 "Manufacture product 3 Objective lens 4 Optical recording disk 11 1st laser light source 12 2nd laser light source 12
25 Light receiving element 50 Aberration correction plate 100 First position adjusting device (optical head device manufacturing device)
120, 220 Low magnification imaging device 130, 230 High magnification imaging device 140, 240 Pseudo disk imaging device (pseudo disk observation device)
142, 242 Imaging lens 143, 243 Pseudo disk 200 Second position adjustment device (optical head device manufacturing device)
270 Power Distribution Imaging Device Lo Light Guide System

Claims (12)

A laser light source; a light receiving element; an objective lens; and a collimating lens that guides the emitted light from the laser light source to the objective lens as collimated light, and receives the return light from the optical recording disk passing through the objective lens. In a method of manufacturing an optical head device having a light guide system that leads to an element,
In the adjustment step of adjusting the relative position between the laser light source and the light receiving element, a pseudo disk composed of a mirror is disposed at a position corresponding to the optical recording disk, and is connected between the pseudo disk and the light guide system. A laser beam is emitted from the laser light source in a state where an image lens is arranged to form a spot on the pseudo disk, and based on a detection result of the return light from the pseudo disk by the light receiving element, the laser light source and A method of manufacturing an optical head device, comprising adjusting a relative position with respect to the light receiving element.   2. The optical head according to claim 1, wherein when performing the adjustment step, a lens having a longer focal point than the objective lens is disposed as the imaging lens between the pseudo disk and the light guide system. Device manufacturing method.   2. The method of manufacturing an optical head device according to claim 1, wherein the objective lens is disposed as the imaging lens between the pseudo disk and the light guide system when performing the adjustment step.   4. The translucent plate having a thickness corresponding to the thickness of the transparent protective layer formed on the surface of the recording layer of the optical recording disk when performing the adjusting step, the imaging lens and the pseudo disk, A method of manufacturing an optical head device, wherein the optical head device is disposed between the two. 4. The optical head device according to claim 3, wherein the optical head device has a long wavelength for recording and / or reproducing the first optical recording disk having a thick transparent protective layer formed on the surface of the recording layer as the laser light source. A first laser light source that emits the laser beam and a short for recording and / or reproducing the second optical recording disk in which the thickness of the transparent protective layer is smaller than that of the first optical recording disk And an aberration corresponding to the thickness of the transparent protective layer of the first optical recording disk and the second optical recording disk. Is attached,
When performing the adjustment step, when adjusting the relative position of the first laser light source and the light receiving element, and when adjusting the relative position of the second laser light source and the light receiving element, A method of manufacturing an optical head device, wherein translucent plates having different thicknesses are disposed between the imaging lens and the pseudo disk. 4. The optical head device according to claim 3, wherein the optical head device has a long wavelength for recording and / or reproducing the first optical recording disk having a thick transparent protective layer formed on the surface of the recording layer as the laser light source. A first laser light source that emits the laser beam and a short for recording and / or reproducing the second optical recording disk in which the thickness of the transparent protective layer is smaller than that of the first optical recording disk And an aberration corresponding to the thickness of the transparent protective layer of the first optical recording disk and the second optical recording disk. Is attached,
When performing the adjustment step, a plurality of light-transmitting plates are prepared, the relative position between the first laser light source and the light receiving element is adjusted, and the second laser light source and the light receiving element. When the relative position of the optical head is adjusted, a different number of the light-transmitting plates are arranged between the imaging lens and the pseudo disk. 4. The optical head device according to claim 3, wherein the optical head device has a long wavelength for recording and / or reproducing the first optical recording disk having a thick transparent protective layer formed on the surface of the recording layer as the laser light source. A first laser light source that emits the laser beam and a short for recording and / or reproducing the second optical recording disk in which the thickness of the transparent protective layer is smaller than that of the first optical recording disk And an aberration corresponding to the thickness of the transparent protective layer of the first optical recording disk and the second optical recording disk. Is attached,
When performing the adjustment step, a translucent plate having a different thickness depending on the region is prepared, and the relative position between the first laser light source and the light receiving element is adjusted, and the second laser light source A method of manufacturing an optical head device, wherein the region of the light transmitting plate located between the imaging lens and the pseudo disk is made different when the relative position with respect to the light receiving element is adjusted. 8. The pseudo disk observation device according to claim 1, wherein a half mirror that partially transmits laser light is used as the pseudo disk, and a spot formed on the pseudo disk is observed from the back side of the pseudo disk. Place and
A method for manufacturing an optical head device, comprising: adjusting a relative position between the pseudo disk and the imaging lens based on an observation result of the pseudo disk observation apparatus. A laser light source; a light receiving element; an objective lens; and a collimating lens that guides light emitted from the laser light source as collimated light to the objective lens, and receives the return light from the optical recording disk passing through the objective lens. An optical head device manufacturing apparatus used in an adjustment process of adjusting a relative position between the laser light source and the light receiving element among manufacturing processes of an optical head device having a light guide system that leads to an element,
A pseudo disk composed of a mirror on which a spot of laser light emitted from the laser light source is formed at a position corresponding to the optical recording disk;
An optical head device manufacturing apparatus, wherein return light from the pseudo disk is detected by the light receiving element.   10. The optical head device manufacturing apparatus according to claim 9, wherein a lens having a longer focal point than the objective lens is disposed as the imaging lens between the pseudo disk and the light guide system.   10. The optical head device manufacturing apparatus according to claim 9, wherein the objective lens is arranged as the imaging lens between the pseudo disk and the light guide system.   12. The pseudo disk observation device according to claim 9, wherein a half mirror that partially transmits laser light is used as the pseudo disk, and a spot formed on the pseudo disk is observed from the back side of the pseudo disk. It has an optical head device manufacturing apparatus.

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