JP2007102965A - Method for manufacturing optical integrated unit, method for manufacturing optical pickup apparatus and manufacturing apparatus of optical integrated unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical integrated unit in which the attachment accuracy of a light receiving means is high and a method for manufacturing an optical pickup apparatus in which the accuracy of relative positions between the optical integrated unit and an objective lens is high. <P>SOLUTION: The manufacturing method is provided with a process for adjusting an attaching position of a light receiving means on the basis of a detection signal generated in a first light receiving part by non-diffraction light out of the non-diffraction light and diffraction light generated by separating return light by a diffraction means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical integrated unit manufacturing method and an optical pickup device manufacturing method. More specifically, by improving the mounting position accuracy of the optical integrated unit mounted on the optical pickup and the manufacturing method of the optical integrated unit capable of stable signal detection by improving the mounting position accuracy of the light receiving element in the optical integrated unit. The present invention relates to a method of manufacturing an optical pickup device capable of stable signal detection.

  In recent years, the information recording capacity of optical recording media such as optical discs has been increased in density and capacity in order to record high-quality moving pictures and the like, and the optical pickup device has been reduced in size for use in mobile applications. There is a strong demand for weight reduction.

  In view of this, various integrated pickups have been proposed in response to the demand for reduction in size and weight. For example, Patent Document 1 proposes an optical integrated unit including a hologram element and a beam splitter and an optical pickup device including the optical integrated unit.

  First, the principle of the optical integrated unit and the optical pickup device will be described with reference to FIGS.

  FIG. 19 is a configuration diagram of the optical pickup device. Light emitted from the light source mounted on the optical integrated unit 101 is collimated by the collimator lens 102 and then condensed on the optical disc 104 via the objective lens 103. Then, the return light reflected from the optical disk 104 is condensed again on the light receiving element 110 mounted on the optical integrated unit 101 via the objective lens 103 and the collimator lens 102. The optical disc 104 includes a substrate 104a, a cover layer 104b through which a light beam is transmitted, and a recording layer 104c used for recording / reproducing information.

  FIG. 20 is a diagram showing a detailed structure of the optical integrated unit 101. The light 120 (optical axis center 122) emitted from the semiconductor laser (light source) 105 is divided into a main beam (0th-order diffracted light) and two sub-beams (± 1st-order diffracted light) by the three-beam diffraction grating 106. The light passes through the polarization beam splitter (PBS) surface 107 a, passes through the quarter-wave plate 108, and travels toward the collimator lens 102. In order to avoid complication of the drawing, the sub beam (± first order diffracted light) is not shown.

  Then, the return light 121 passes through the quarter-wave plate 108, is reflected by the PBS surface 107 a and the reflection mirror surface 107 b, and enters the hologram element 109. The return light 121 incident on the hologram element 109 is diffracted and divided into + 1st order diffracted light (optical axis center 125a) and −1st order diffracted light (optical axis center 125b), and enters the light receiving element 110. In order to avoid complication of the drawing, only the light beam centered on the optical axis is shown as the return light 121.

  Here, the light emitted from the semiconductor laser 105 is linearly polarized light (P-polarized light) whose polarization direction is the x direction, is transmitted through the PBS surface 107a, is circularly polarized by the quarter wavelength plate 108, and enters the optical disk 104. . The return light from the optical disk 104 is incident on the quarter-wave plate 108 again, becomes y-direction linearly polarized light (S-polarized light), and is reflected by the PBS surface 107a.

  Therefore, almost all of the light emitted from the semiconductor laser 105 is guided to the optical disk 104 in both the main beam and the sub beam, and almost all of the return light can be guided to the light receiving element 110, so that the light utilization efficiency is high.

  FIG. 21 is a diagram for explaining the hologram pattern of the hologram element 109 and the light receiving portion pattern of the light receiving element 110. The hologram element 109 is divided into three regions 109a to 109c by a dividing line 109x in the x direction corresponding to the radial direction of the optical disc 104 and a dividing line 109y in the y direction corresponding to the direction along the track. The light receiving element 110 includes six light receiving portions 110a to 110f that detect + 1st order diffracted light by the hologram element 109 and three light receiving portions 110g to 110i that detect −1st order diffracted light. Then, a focus error signal (FES) by the single knife edge method and a tracking error signal (TES) by the differential push-pull (DPP) method are detected with the + 1st order diffracted light, and an information signal (RF signal) is detected with the -1st order diffracted light. TES by the phase difference (DPD) method is detected.

  The frequency response of the light receiving element required for servo signal detection such as FES detection or TES detection by the DPP method is generally detectable even at a sufficiently lower frequency than the RF signal. On the other hand, a high-speed light-receiving element is required for TES detection using an RF signal or a phase difference (DPD) method.

  In designing the light receiving element 110, the light receiving portion for detecting the RF signal needs to have a smaller light receiving portion area in order to cope with high-speed reproduction of the RF signal, while the light receiving portion for detecting the FES has a response. However, there are two requirements that make it difficult to achieve both the necessity of keeping the area of the light receiving portion large in order to ensure a sufficient pull-in range. In the prior art, both the + 1st order diffracted light and the −1st order diffracted light are used to share the role of signal generation, thereby achieving both high-speed RF signal and securing the FES signal pull-in range.

  In order to obtain a stable detection signal in the integrated optical unit, in the manufacturing process of the integrated optical unit, the return light incident on the light receiving unit is received from the light source so that it accurately enters the light receiving unit provided in the light receiving unit. It is necessary to arrange the optical system components existing on the optical path to the means. Speaking of the optical integrated unit 101, + 1st order diffracted light (optical axis center 125a) and −1st order diffracted light diffracted by the hologram element 109 are received by the light receiving portions (110a to 110i) provided in the light receiving element 110. It is necessary to attach the light receiving element 110 or the beam splitter 107 that guides the return light to the light receiving element 110 so that the (optical axis center 125b) is correctly incident.

  Further, in the optical integrated unit including the diffraction means having the hologram pattern as in the hologram element 109, the diffraction means so that the return light incident on the diffraction means is correctly divided by the hologram pattern in the manufacturing process. Must be mounted in the correct position with respect to the optical axis of the return light. When the diffracting means is not attached at a predetermined position, there arises a problem that the diffracted light does not correctly enter the light receiving unit in the light receiving unit that receives the diffracted light.

  In the optical integrated unit 101, the hologram element 109 and the beam splitter 107 are integrated. The integrated hologram element 109 and beam splitter 107 are rotationally adjusted around the optical axis 122 of the light 120 emitted from the light source 105, thereby showing the condensed spot of the return light incident on the light receiving element 110. It can be moved in the y-axis direction. Thereby, it is possible to correct the FES offset.

  For example, Patent Document 2 discloses an optical pickup device manufacturing method that precisely adjusts the relative position between a semiconductor laser and a light receiving element by adjusting the position of the light receiving element while monitoring the output signal of the light receiving element. It is disclosed.

  Based on FIG. 22, the structure of this optical pickup device and the principle of the manufacturing method will be described.

  FIG. 22 is a configuration diagram showing the structure of the optical pickup device 201 disclosed in Patent Document 2. As shown in FIG.

  The light beam 220 emitted from the semiconductor laser (light source) 205 is divided into a main beam (0th order diffracted light) and two sub beams (± 1st order diffracted light) by the three-beam diffraction grating 231, and passes through the hologram element 232 to be an optical disc. It is emitted toward. In order to avoid complication of the drawing, the sub beam (± first order diffracted light) is not shown. The return light 221 from the optical disk is diffracted by the hologram element 232, and the diffracted light 221 enters the light receiving element 210.

  The semiconductor laser 205 is housed in a package 217 including a cap 217b and a base 217a in which an opening through which diffracted light is transmitted is formed. The three-beam diffraction grating 231 and the hologram element 232 are formed on a transparent substrate 215, and the transparent substrate 215 is bonded and fixed on the cap 217 without adjustment by mechanical accuracy.

  The light receiving element 210 is attached to the base 217a through the substrate 219. The positions of the light receiving element 210 and the substrate 219 relative to the base 217 a are adjusted based on an output signal output from the light receiving element 210 that detects the diffracted light 221 diffracted by the hologram element 232. That is, the output signal from the light receiving element 210 is monitored, and the substrate 219 and the base 217a are fixed in a state where the output signal becomes a predetermined value. As a result, the relative position between the light receiving element 210 and the return light can be accurately determined.

Patent Document 3 discloses an optical head device that receives non-diffracted light and diffracted light separated by a diffraction means. In the method of manufacturing the optical head device, an ROT signal (rotation error signal) is generated from an output signal detected from the diffracted light, the diffractive means is rotated based on the ROT signal, and the mounting angle of the diffractive means is adjusted. Is done.
JP 2001-273666 A (published October 5, 2001) JP 2003-59094 A (published February 28, 2003) JP 2002-190125 A (released July 5, 2002) Japanese Patent Laid-Open No. 2001-250250 (published September 14, 2001) JP 2002-157771 A (published on May 31, 2002)

  However, in the conventional method of manufacturing an optical integrated unit, the light receiving unit is adjusted in its mounting position based on the detection signal generated by the diffracted light in the light receiving unit that receives the diffracted light diffracted by the diffracting unit. It was. For this reason, there is a problem that the mounting position of the light receiving means changes due to the influence of the tolerance of the diffracting means (such as fluctuation of the diffraction angle due to the variation in the grating interval) or the influence of the error of the mounting position of the diffracting means. . Therefore, it is difficult to adjust the mounting position of the light receiving means so that the non-diffracted light is correctly received by the light receiving unit that receives the non-diffracted light provided in the light receiving means.

  For this reason, in order to secure a sufficient drawing range of the non-diffracted light incident on the light receiving portion that receives non-diffracted light, it is necessary to increase the area of the light receiving portion sufficiently. In other words, an optical integrated unit that generates a high-speed signal such as an RF signal in a light receiving unit that receives non-diffracted light by a conventional manufacturing method, and the optical integrated unit in which the light receiving unit that receives non-diffracted light is designed to be small. It was difficult to manufacture the unit.

  More specifically, the above problem is as follows.

  As described above, the light receiving element 110 of the optical integrated unit 101, which is a conventional optical integrated unit disclosed in Patent Document 1, includes six light receiving units 110a to 110f that detect + first-order diffracted light by the hologram element 109, and − The light receiving element 110 includes three light receiving portions 110g to 110i that detect first-order diffracted light, and the mounting position of the light-receiving element 110 is adjusted based on detection signals generated in the light-receiving portion by ± first-order diffracted light. For this reason, the condensing spot position of the non-diffracted light focused on the light receiving means changes due to an error in the mounting position of the hologram element 109 or the tolerance of the hologram pattern in the hologram element 109. Therefore, it is difficult to accurately adjust the mounting position of the light receiving element 110 with respect to the non-diffracted light that passes through the hologram element 109 and enters the light receiving element 110.

  Further, regarding the adjustment of the mounting position of the light receiving element 110 and the hologram element 109 in the optical integrated unit 101, the following problems also exist at the same time.

  In the optical integrated unit 101, the PBS surface 107a and the reflection mirror surface 107b are arranged in parallel. Therefore, even if the integrated hologram element 109 and beam splitter 107 are translated in the x-axis direction (illustrated) or the y-axis direction (illustrated) in a plane perpendicular to the optical axis 122, the light-receiving element 110 is obtained. The position of the condensing spot of the incident return light does not move. That is, in the optical integrated unit 101, it is impossible to move the condensing spot of the return light incident on the light receiving element 110 in the x-axis direction.

  Further, in the optical integrated unit 101, it is considered that the condensing spot of the return light incident on the light receiving element 110 cannot be moved in the x-axis direction by adjusting the mounting position of the integrated hologram element 109 and beam splitter 107. Therefore, it is necessary to sufficiently secure the dimension in the x direction of each light receiving portion so that the condensed spot of the return light does not protrude from the light receiving portion provided in the light receiving element 110. That is, it is necessary to increase the area of the light receiving portion in the light receiving element 110. Therefore, there is a problem that it is difficult to detect a high-speed signal such as an RF signal in the light receiving unit.

  In other words, in order to manufacture an optical integrated unit capable of detecting a high-speed signal such as an RF signal in the light receiving unit of the light receiving element 110 (that is, to manufacture an optical integrated unit having a small light receiving unit area), the return It is necessary to strictly manage the processing accuracy of the semiconductor laser 105, the hologram element 109, and the beam splitter 107 and the mounting errors of these members so that the light accurately enters the light receiving unit. That is, when manufacturing the optical integrated unit 101 capable of high-speed reproduction of RF signals, it is necessary to use high-precision manufacturing equipment and high-accuracy parts, and there is a problem that the manufacturing cost of the optical integrated unit increases.

  In the optical integrated unit 101, the three-beam diffraction grating 106 and the hologram element 109 are integrated with the polarization beam splitter 107. Therefore, when the hologram element 109 is moved in a plane orthogonal to the optical axis of the return light so that the return light is accurately incident on the light receiving portion of the light receiving element 110, the three-beam diffraction grating 106 is also moved at the same time. A positional deviation of the three-beam diffraction grating 106 with respect to the optical axis center of the emitted light beam 120 occurs.

  In the three-beam diffraction grating, several regions divided by a boundary line passing through the center are formed. When the phase shift DPP method is used to detect the tracking error signal (TES), the cross-sectional area ratio of the light beam 120 divided by the boundary line is an important parameter that determines the performance.

  However, in the optical integrated unit 101, as described above, when the position of the hologram element 109 is adjusted, the three-beam diffraction grating is also moved at the same time, and the center of the forward optical axis is shifted from the center of the three-beam diffraction grating 106. For this reason, there is a problem that it is difficult to use the phase shift DPP method for detecting TES.

  Also in the method of manufacturing the optical pickup device as shown in Patent Document 2, it is necessary to adjust the mounting position of the light receiving means based on the light receiving state of the diffracted light. In other words, it is necessary to determine the position of the light receiving element 210 with reference to the return light 221 diffracted by the hologram element 232.

  For this reason, there is a problem that the position of the light receiving element 210 for correctly receiving the return light 221 changes depending on the mounting position of the hologram element 232 and the hologram pattern production error in the hologram element 232.

  In addition, the light receiving unit for receiving the diffracted light diffracted by the hologram element 232 includes a region divided by a boundary parallel to the diffraction direction so as not to be affected by the change in the diffraction angle due to the wavelength variation of the light source. . Therefore, with respect to the positional deviation of the diffracted light incident on the light receiving portion in the direction along the dividing line that forms the boundary, the state where the condensed spot protrudes from the light receiving portion is detected and set to the intermediate point. Thus, it is necessary to position the focused spot and the light receiving element 210. Therefore, there is a problem that positioning accuracy is poor.

  Further, Patent Document 3 includes a diffractive means for branching return light into non-diffracted light and diffracted light, and a light detection means having a light detection region for detecting non-diffracted light and a light detection region for detecting diffracted light. An optical head device is disclosed, and a method for adjusting the diffraction means is described. However, in Patent Document 3, although the rotation adjustment of the diffractive means is described, the adjustment of the mounting position of the light receiving means is not particularly considered.

  Furthermore, with the recent increase in the density of optical recording media, optical integrated units are required to have higher optical output and faster RF signal reproduction. For this reason, an optical integrated unit that can use a general-purpose light source and a general-purpose light-receiving element, which can be handled by exchanging the light source to increase the output of the light and replacing the light-receiving element to increase the speed of the RF reproduction signal. The structure of is required. However, when general-purpose parts are mounted on the optical integrated unit having such a structure without adjustment, there is a problem in that an error in the mounting position of the light receiving element with respect to the light source is increased.

  Further, in the prior art, when the optical integrated unit is mounted on the optical pickup device, no consideration has been given to a method for reproducing the adjustment state of the optical integrated unit in the optical pickup device. Therefore, when an optical integrated unit is adjusted (manufactured) on the optical pickup device, a mechanism part for adjustment is provided in the optical pickup device, or the optical integrated unit components are held by an adjustment jig from the outside. Therefore, there is a problem in that a space for the optical pickup device must be secured, which hinders downsizing and cost reduction of the optical pickup device.

  The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to manufacture an optical integrated unit with a smaller area of the light receiving portion by increasing the positioning accuracy of the light receiving element, and to reproduce an RF signal at a high speed. Is to provide a method of manufacturing an optical integrated unit. It is another object of the present invention to provide a method for manufacturing an optical pickup device that can realize improvement in signal quality by reproducing an adjustment state at the time of manufacturing an optical integrated unit when the optical integrated unit is mounted on the optical pickup device.

  An optical integrated unit manufacturing method according to the present invention includes a light source that emits a light beam, and an optical axis of return light of the light beam reflected by an optical recording medium. The return light is diffracted from non-diffracted light. A light receiving unit having a first light receiving unit that receives non-diffracted light separated by the diffraction unit, and a second light receiving unit that receives the diffracted light separated by the diffraction unit; A method of manufacturing an optical integrated unit comprising: a step of adjusting an attachment position of the light receiving means based on a detection signal generated in the first light receiving unit by the non-diffracted light. Yes.

  According to the above configuration, the mounting position of the light receiving means is adjusted using the non-diffracted light transmitted through the diffracting means. For this reason, it is possible to accurately adjust the position of the light receiving means without being affected by the diffraction means. That is, the mounting position of the light receiving means is such that the non-diffracted light transmitted through the diffracting means is accurately received by the light receiving section without being affected by the tolerance of the diffracting means, such as fluctuations in the diffraction angle due to variations in grating spacing Can be adjusted.

  For this reason, light with which a more stable detection signal can be obtained without adjustment or by adjusting the mounting position of the light receiving means based on the light receiving state of the diffracted light and compared with the conventional method of manufacturing an optical integrated unit to which the light receiving means is attached. The integrated unit can be manufactured.

  Further, according to the above configuration, the mounting position of the light receiving means can be adjusted so that the non-diffracted light transmitted through the diffracting means can be accurately received by the light receiving portion, and therefore, the non-diffracted light incident on the light receiving means can be adjusted. In consideration of the incident position error of the diffracted light, it is not necessary to secure a large area of the light receiving portion of the light receiving means.

  For this reason, it is possible to adjust the mounting position of the light receiving means without adjustment or to adjust the mounting position of the light receiving means based on the light receiving state of the diffracted light, and to provide a highly accurate structural member or There is an effect that it is possible to manufacture an optical integrated unit including a light receiving unit having a smaller light receiving part area without using an accurate manufacturing facility.

  Therefore, in the manufacture of an optical integrated unit that detects a high-speed signal such as an RF signal or a DPD signal by the light receiving unit, an optical integrated unit that can be reproduced at a higher speed without causing an increase in manufacturing cost. It becomes possible. Furthermore, since the area of the light receiving portion is reduced, it is less likely to be affected by other layer stray light during reproduction of the multilayer optical recording medium. In other words, it is possible to manufacture an optical integrated unit corresponding to a multilayer optical recording medium, which is less susceptible to detection signal contamination by other layers of stray light.

  An optical integrated unit manufacturing method according to the present invention includes a light source that emits a light beam, and an optical axis of return light of the light beam reflected by an optical recording medium. The return light is diffracted from non-diffracted light. Diffracting means for separating light, light guiding means for transmitting the light beam and guiding non-diffracted light and diffracted light separated by the diffracting means in a direction different from the light source, and the light guiding means A method of manufacturing an optical integrated unit comprising: a first light receiving unit that receives the guided non-diffracted light; and a light receiving unit that includes a second light receiving unit that receives the diffracted light guided by the light guiding unit. And moving the light receiving means integrally with the light guiding means based on the detection signal generated in the first light receiving section by the non-diffracted light, and adjusting the mounting position of the light receiving means. It is characterized by

  According to the above configuration, the mounting position of the light receiving means is adjusted using the non-diffracted light transmitted through the diffracting means. For this reason, it is possible to accurately adjust the position of the light receiving means without being affected by the diffraction means. That is, the mounting position of the light receiving means is such that non-diffracted light that has passed through the diffraction means is accurately received by the light receiving unit without being affected by the tolerance of the diffraction means, such as fluctuations in the diffraction angle due to variations in grating spacing. Can be adjusted.

  For this reason, light with which a more stable detection signal can be obtained without adjustment or by adjusting the mounting position of the light receiving means based on the light receiving state of the diffracted light and compared with the conventional method of manufacturing an optical integrated unit to which the light receiving means is attached. The integrated unit can be manufactured.

  Further, according to the above configuration, the mounting position of the light receiving means can be adjusted so that the non-diffracted light transmitted through the diffracting means can be accurately received by the light receiving portion, and therefore, the non-diffracted light incident on the light receiving means can be adjusted. In consideration of the incident position error of the diffracted light, it is not necessary to secure a large area of the light receiving portion of the light receiving means.

  For this reason, it is possible to adjust the mounting position of the light receiving means without adjustment or to adjust the mounting position of the light receiving means based on the light receiving state of the diffracted light, and to provide a highly accurate structural member or There is an effect that it is possible to manufacture an optical integrated unit including a light receiving unit having a smaller light receiving part area without using an accurate manufacturing facility.

  Therefore, in the manufacture of an optical integrated unit that detects a high-speed signal such as an RF signal or a DPD signal by the light receiving unit, an optical integrated unit that can be reproduced at a higher speed without causing an increase in manufacturing cost. It becomes possible. Furthermore, since the area of the light receiving portion is reduced, it is less likely to be affected by other layer stray light during reproduction of the multilayer optical recording medium. In other words, it is possible to manufacture an optical integrated unit corresponding to a multilayer optical recording medium, which is less susceptible to detection signal contamination by other layers of stray light.

  According to the above configuration, since the light receiving means and the light guide means are adjusted in an integrated state, the light receiving means and the light guide means are adjusted in the step of adjusting the mounting position of the light receiving means. The relative position of does not change. For this reason, it is not necessary to secure a margin in the light guide means in consideration of a change in the mounting position of the light receiving element, and the light guide means can be made smaller. That is, there is a further effect that it is possible to manufacture a smaller and lighter optical integrated unit.

  An optical integrated unit manufacturing method according to the present invention includes a light source that emits a light beam, and an optical axis of return light of the light beam reflected by an optical recording medium. The return light is diffracted from non-diffracted light. A light receiving unit having a first light receiving unit that receives non-diffracted light separated by the diffraction unit, and a second light receiving unit that receives the diffracted light separated by the diffraction unit; The optical integrated unit is manufactured by the method of manufacturing the integrated optical unit, wherein the diffracting means is attached to the integrated optical unit before passing through the same optical path as the non-diffracted light. The method includes a step of adjusting an attachment position of the light receiving means based on a detection signal generated in the first light receiving portion.

  According to the above configuration, the mounting position of the light receiving means is adjusted using return light that enters the first light receiving section through the same optical path as the non-diffracted light. That is, in the optical integrated unit to which the diffractive means is attached, the non-diffracted light transmitted through the attached diffractive means passes through the same optical path as the return light used for adjusting the attachment position of the light receiving means, Incident on the light receiving means. For this reason, it is possible to adjust the mounting position of the light receiving means so that the non-diffracted light transmitted through the diffracting means is accurately received by the light receiving portion in a state where the influence of the diffracting means is completely eliminated.

  For this reason, light with which a more stable detection signal can be obtained without adjustment or by adjusting the mounting position of the light receiving means based on the light receiving state of the diffracted light and compared with the conventional method of manufacturing an optical integrated unit to which the light receiving means is attached. The integrated unit can be manufactured.

  In addition, it is not necessary to secure a large area of the light receiving portion of the light receiving means in consideration of the incident position error of the non-diffracted light incident on the light receiving means, so no adjustment or based on the light receiving state of the diffracted light Compared to the conventional method of manufacturing an optical integrated unit in which the light receiving means is mounted and the light receiving means is attached, the light receiving portion has a smaller light receiving area without using high-precision components or high-precision manufacturing equipment. There is an effect that it is possible to manufacture an optical integrated unit including the means.

  Therefore, in the manufacture of an optical integrated unit that detects a high-speed signal such as an RF signal or a DPD signal by the light receiving unit, an optical integrated unit that can be reproduced at a higher speed without causing an increase in manufacturing cost. It becomes possible. Furthermore, since the area of the light receiving portion is reduced, it is less likely to be affected by other layer stray light during reproduction of the multilayer optical recording medium. In other words, it is possible to manufacture an optical integrated unit corresponding to a multilayer optical recording medium, which is less susceptible to detection signal contamination by other layers of stray light.

  An optical integrated unit manufacturing method according to the present invention includes a light source that emits a light beam, and an optical axis of return light of the light beam reflected by an optical recording medium. The return light is diffracted from non-diffracted light. A light receiving unit having a first light receiving unit that receives non-diffracted light separated by the diffraction unit, and a second light receiving unit that receives the diffracted light separated by the diffraction unit; The transparent member having the same refractive index and the same thickness as the diffractive means is placed at the same position as the diffractive means before attaching the diffractive means to the optical integrated unit. Arranged on the basis of the detection signal generated in the first light receiving unit by the return light that passes through the transparent member and passes through the same optical path as the non-diffracted light and enters the first light receiving unit. Method of manufacturing an optical integrated unit, which comprises a step of adjusting the Ri attached position.

  According to the above configuration, the mounting position of the light receiving means is adjusted by using the return light transmitted through the transparent member that enters the first light receiving section through the same optical path as the non-diffracted light. That is, in the optical integrated unit to which the diffractive means is attached, the non-diffracted light transmitted through the attached diffractive means passes through the same optical path as the return light used for adjusting the attachment position of the light receiving means, Incident on the light receiving means. For this reason, the mounting position of the light receiving means is such that the non-diffracted light that has passed through the diffracting means is accurately received by the light receiving portion while the spherical aberration remains the same and the influence of the diffracting means is completely eliminated. Can be adjusted.

  For this reason, light with which a more stable detection signal can be obtained without adjustment or by adjusting the mounting position of the light receiving means based on the light receiving state of the diffracted light and compared with the conventional method of manufacturing an optical integrated unit to which the light receiving means is attached. The integrated unit can be manufactured.

  In addition, it is not necessary to secure a large area of the light receiving portion of the light receiving means in consideration of the incident position error of the non-diffracted light incident on the light receiving means, so no adjustment or based on the light receiving state of the diffracted light Compared to the conventional method of manufacturing an optical integrated unit in which the light receiving means is mounted and the light receiving means is attached, the light receiving portion has a smaller light receiving area without using high-precision components or high-precision manufacturing equipment. There is an effect that it is possible to manufacture an optical integrated unit including the means.

  Therefore, in the manufacture of an optical integrated unit that detects a high-speed signal such as an RF signal or a DPD signal by the light receiving unit, an optical integrated unit that can be reproduced at a higher speed without causing an increase in manufacturing cost. It becomes possible. Furthermore, since the area of the light receiving portion is reduced, it is less likely to be affected by other layer stray light during reproduction of the multilayer optical recording medium. In other words, it is possible to manufacture an optical integrated unit corresponding to a multilayer optical recording medium, which is less susceptible to detection signal contamination by other layers of stray light.

  In the method of manufacturing an optical integrated unit according to the present invention, in the step of adjusting the mounting position of the light receiving means, the light receiving means is within a plane perpendicular to the optical axis of non-diffracted light or return light incident on the light receiving means. Preferably it is moved.

  According to the above configuration, the position of the focused spot is adjusted on the light receiving surface of the light receiving means without changing the size and shape of the focused spot of non-diffracted light or return light incident on the light receiving surface. It becomes possible. For this reason, there is a further effect that it is easy to adjust the mounting position of the light receiving means based on the detection signal generated in the first light receiving unit by non-diffracted light or return light. Further, according to the above configuration, a holder configuration that can adjust the mounting position of the light receiving means is facilitated by sliding the holder that holds the light receiving means and the holder that holds the light source relative to each other. In addition, since it is not necessary to adjust the position by moving the light receiving means in the optical axis direction, it is possible to have a holder configuration in which the light receiving means does not deviate in the optical axis direction with respect to a change with time or an impact.

  In the method of manufacturing an optical integrated unit according to the present invention, the light receiving unit that receives the non-diffracted light is composed of four light receiving cells divided by two straight lines orthogonal to each other, and receives the non-diffracted light. The detection signal generated by is preferably a detection signal composed of four output signals output from the four light receiving cells.

  According to the above configuration, the error in the mounting position of the light receiving means is the error in the first direction in the plane perpendicular to the optical axis of the non-diffracted light incident on the light receiving means, and the first direction in the plane. It is possible to independently detect the error in the second direction orthogonal to. Therefore, according to the above configuration, in the step of adjusting the mounting position of the light receiving means, the direction in which the light receiving means is moved can be obtained simply and accurately, and the adjustment of the mounting position of the light receiving means is facilitated. There is an effect.

  In the optical integrated unit manufacturing method according to the present invention, the step of adjusting the mounting position of the light receiving means includes a step of determining whether the four output signals output from the four light receiving cells are substantially equal. It is preferable.

  According to the above configuration, it is possible to determine whether the optical axis center of the non-diffracted light incident on the light receiving unit and the intersection of two straight lines that divide the light receiving unit in the light receiving unit exactly match. It becomes possible. For this reason, it is possible to manufacture an optical pickup device that can obtain a more stable detection signal.

  The method for manufacturing an optical integrated unit according to the present invention preferably includes a step of recording a detection signal detected by the first light receiving unit as an adjustment error subsequent to the step of adjusting the mounting position of the light receiving means. .

  According to the above configuration, recording the detection signal detected by the first light receiving unit as an adjustment error means recording an attachment position error of the light receiving unit that is determined when the optical integrated unit is manufactured. Therefore, when the optical integrated unit is incorporated in the optical pickup device, the adjustment of the optical pickup device can be optimized using the recorded adjustment error. That is, when the optical integrated unit is manufactured, the mounting position of the light receiving means is adjusted so as to minimize the adjustment error. Therefore, when the optical integrated unit is incorporated in the optical pickup device, the adjustment error at the time of manufacturing the optical integrated unit is reduced. If reproduced, the optical pickup device can be adjusted to minimize the mounting error of the optical integrated unit in the optical pickup device.

  In the method for manufacturing an integrated optical unit according to the present invention, the diffracting means is perpendicular to the optical axis of the return light incident on the diffracting means based on the detection signal generated by the diffracted light at the second light receiving unit. It is preferable to include a step of translating in a plane, rotating the diffractive means about the optical axis of the return light incident on the diffractive means, and adjusting the attachment position and the attachment angle of the diffractive means.

  According to the above configuration, it is possible to adjust the position of the diffracting means relative to the optical axis of the return light and the angle of the diffracting means. For this reason, it is possible to manufacture an optical integrated unit in which the diffracting means is adjusted so that the diffracted light diffracted by the diffracting means accurately enters the light receiving portion that receives the diffracted light. Therefore, in the manufacture of an optical integrated unit that detects a servo signal by the light receiving unit that receives the diffracted light, an optical integrated unit that can generate a stable servo signal can be manufactured.

  In the optical integrated unit manufacturing method according to the present invention, the step of adjusting the attachment position of the diffraction means is preferably performed after the step of adjusting the attachment position of the light receiving means.

  According to the above configuration, the attachment position of the diffractive means is adjusted with the light receiving means positioned accurately. For this reason, there is a further effect that it is possible to further improve the adjustment accuracy of the attachment position of the diffraction means with respect to the light receiving means. Therefore, in the manufacture of the optical integrated unit that detects the servo signal by the light receiving unit that receives the diffracted light, it is possible to manufacture the optical integrated unit that can generate a more stable servo signal.

  An optical pickup device manufacturing method according to the present invention, comprising: a light source that emits a light beam; and an optical axis of return light of the light beam reflected by an optical recording medium, wherein the return light is non-diffracted light. Receiving means having a diffracting means for separating the diffracted light, a first light receiving part for receiving the non-diffracted light separated by the diffracting means, and a second light receiving part for receiving the diffracted light separated by the diffracting means. An optical integrated unit comprising: means; a collimator lens disposed on the optical axis of the light beam that converts the light beam emitted from the optical integrated unit into parallel light; and the collimator lens converts the light beam into parallel light. And an objective lens arranged on the optical axis of the light beam, the method for manufacturing the optical pickup device includes a non-diffracted light in the first light receiving unit. Based on the detection signal formed, the objective lens is moved in a plane perpendicular to the optical axis of the light beam, and / or the optical integrated unit is integrated with the collimator lens on the optical axis of the light beam. The method includes a step of moving in a vertical plane and adjusting a relative mounting position of the objective lens and the optical integrated unit.

  According to the above configuration, the optical integrated unit, the collimator lens, and the objective according to the light receiving state of the non-diffracted light with respect to the light receiving unit at the time of recording or reproducing information with respect to the optical recording medium by the optical pickup. It becomes possible to adjust the mounting position of the lens. For this reason, it is possible to manufacture an optical pickup device that can obtain a stable detection signal as compared with the case where the optical integrated unit, the collimator lens, and the objective lens are attached to the optical pickup device with mechanical accuracy. .

  In the method of manufacturing an optical pickup device according to the present invention, in the step of adjusting the relative mounting position of the objective lens and the optical integrated unit, the objective lens is placed in a plane perpendicular to the optical axis of the light beam. The moving direction and the direction in which the optical integrated unit is integrated with the collimator lens in a plane perpendicular to the optical axis of the light beam are preferably orthogonal to each other.

  According to the above configuration, the adjustment of the relative position between the objective lens, the optical integrated unit, and the member integrated with the collimator lens is not limited to the adjustable range, and the optical integrated unit and the collimator are not limited. The direction in which the lens is moved integrally can be limited to a uniaxial direction. For this reason, in the optical pickup device manufactured by the above manufacturing method, it is not necessary to secure a space in consideration of adjusting the mounting position of the collimator lens and the optical integrated unit in a direction orthogonal to the uniaxial direction. The optical pickup device can be reduced in size and weight. That is, according to the above configuration, there is an additional effect that a smaller and lighter optical pickup device can be manufactured.

  In the method of manufacturing an optical pickup device according to the present invention, the step of adjusting the relative mounting position of the objective lens and the optical integrated unit is a detection generated in the first light receiving unit by the non-diffracted light. The objective lens is moved in a plane perpendicular to the optical axis of the light beam and / or the optical integrated unit is moved to the collimator so that the signal is the same as the adjustment error recorded at the time of manufacturing the optical integrated unit. It is preferable to adjust the relative mounting position of the objective lens and the optical integrated unit by moving in a plane perpendicular to the optical axis of the light beam integrally with the lens.

  According to the above configuration, it is possible to manufacture an optical pickup device that reproduces an adjustment error in manufacturing an optical integrated unit. That is, it becomes possible to manufacture an optical pickup device that minimizes the mounting error of the optical integrated unit for a given optical integrated unit.

  An optical integrated unit manufacturing apparatus according to the present invention is provided on a light source that emits a light beam and an optical axis of the return light of the light beam reflected by an optical recording medium, and the return light is diffracted from non-diffracted light. A light receiving unit having a first light receiving unit that receives non-diffracted light separated by the diffraction unit, and a second light receiving unit that receives the diffracted light separated by the diffraction unit; A manufacturing apparatus for manufacturing an integrated optical unit comprising: an input unit connected to the integrated optical unit and configured to input a detection signal generated by the first light receiving unit; and an error signal from the detection signal. An arithmetic unit for calculating and an output unit for outputting the error signal are provided.

  According to the above configuration, the mounting position of the light receiving means can be adjusted manually or by another adjusting device provided on the basis of the error signal output to the output unit. Further, the mounting position of the light receiving means is adjusted using non-diffracted light transmitted through the diffracting means. For this reason, it is possible to accurately adjust the position of the light receiving means without being affected by the diffraction means. That is, the mounting position of the light receiving means is such that the non-diffracted light transmitted through the diffracting means is accurately received by the light receiving section without being affected by the tolerance of the diffracting means, such as fluctuations in the diffraction angle due to variations in grating spacing. Can be adjusted.

  As described above, the optical integrated unit manufacturing method according to the present invention is based on the detection signal generated in the light receiving unit for receiving the non-diffracted light, and the optical axis of the non-diffracted light incident on the light receiving means. And moving the light receiving means within a plane perpendicular to the surface to adjust the mounting position of the light receiving means.

  According to the above configuration, it is possible to accurately adjust the position of the light receiving means without being affected by the diffraction means. That is, the mounting position of the light receiving means is such that non-diffracted light that has passed through the diffraction means is accurately received by the light receiving unit without being affected by the tolerance of the diffraction means, such as fluctuations in the diffraction angle due to variations in grating spacing. Can be adjusted.

  For this reason, an optical integrated unit capable of performing more stable signal detection compared to a conventional method of manufacturing an optical integrated unit that is not adjusted or that adjusts the mounting position of the light receiving means based on the light receiving state of the diffracted light and attaches the light receiving means. Has the effect of being able to be manufactured.

  As described above, the method of manufacturing the optical pickup device according to the present invention moves the objective lens perpendicular to the optical axis of the light beam based on the detection signal generated in the light receiving unit for receiving the non-diffracted light. And / or moving the integrated optical unit integrally with the collimator lens in a plane perpendicular to the optical axis of the optical beam, so that the objective lens and the integrated optical unit can be moved relative to each other. The method includes a step of adjusting the mounting position.

  According to the above configuration, the objective lens and the optical integrated unit are relative to each other in accordance with the light receiving state of the non-diffracted light with respect to the light receiving unit at the time of recording or reproducing information with respect to the optical recording medium by the optical pickup. It is possible to adjust the mounting position. For this reason, compared with the case where the optical integrated unit, the collimator lens, and the objective lens are attached to the optical pickup device with mechanical accuracy, it is possible to manufacture an optical pickup device that can obtain a stable detection signal. Play.

[Embodiment 1]
An embodiment according to the present invention will be described below with reference to FIGS. In the following description, an optical pickup provided in an optical information recording / reproducing apparatus for optically recording and reproducing information with respect to an optical disc (optical information recording medium) will be described as an optical integrated unit manufacturing method according to the present invention. It demonstrates in the state mounted in the manufacturing apparatus corresponded to an apparatus.

  FIG. 15 is a configuration diagram of an optical pickup device 8 on which the optical integrated unit 1 is mounted. The optical pickup device 8 includes an optical integrated unit 1, a collimator lens 2, an objective lens 3, and a ¼ wavelength plate 5, and optically records and reproduces information with respect to the optical disc 4. It has become.

  On the other hand, FIG. 3 is a schematic diagram showing the configuration of the optical integrated unit manufacturing apparatus 9. The manufacturing apparatus 9 includes the same components as the optical pickup apparatus 8 so as to reproduce the state in which the optical integrated unit is mounted on the optical pickup apparatus 8. That is, the optical integrated unit manufacturing apparatus 9 includes a collimator lens 2, an objective lens 3, an optical disk 4, and a ¼ wavelength plate 5. The optical integrated unit 1 is held by the manufacturing apparatus 9 in a detachable state.

  In the manufacturing apparatus 9, the light beam emitted from the light source 11 mounted on the optical integrated unit 1 is collimated by the collimator lens 2 and then condensed on the optical disk 4 through the objective lens 3. Then, the light reflected from the optical disk 4 (hereinafter referred to as “return light”) passes through the objective lens 3 and the collimator lens 2 again and is received on the light receiving element 12 mounted on the optical integrated unit 1. The

  In the manufacturing apparatus 9, a quarter-wave plate 5 is provided between the collimator lens 2 and the objective lens 3 on the optical axis of the light beam emitted from the light source 11 mounted on the optical integrated unit 1. ing. Due to the ¼ wavelength plate 5, the incident light to the optical disk 4 and the return light from the optical disk 4 have a polarization direction different by 90 degrees.

The optical disc 4 includes a substrate 4a, a cover layer 4b through which a light beam is transmitted, and a recording layer 4c formed at the boundary between the substrate 4a and the cover layer 4b, and is driven by a spindle motor (not shown). Rotation control is performed. The objective lens 3 is driven in the focus direction (z direction) and the tracking direction (x direction) by an objective lens drive mechanism (not shown), and there is surface deflection or eccentricity of the optical disc 4. Also, the condensing spot follows a predetermined position of the recording layer 4c.

The tracking direction is equal to the radial direction of the optical disk 4 and is shown in the x direction in FIG. Further, in the plane parallel to the optical disc 4 mounted on the manufacturing apparatus 9, the direction perpendicular to the x direction, that is, the tangential direction on the circumference of the optical disc 4, is shown in the y direction in FIG. Further, the direction perpendicular to the x and y directions, that is, the focus direction is shown in the z direction in FIG.

  In the present embodiment, the case where the light source 11 of the optical integrated unit 1 is a short wavelength light source having a wavelength of about 405 nm and the manufacturing apparatus 9 includes a high NA objective lens having a numerical aperture NA of about 0.85 will be described. Although the present invention is not limited to this, an optical integrated unit capable of writing to and reading from a high-density optical recording medium can be manufactured.

  Hereinafter, the configuration of the optical integrated unit 1 will be described in detail. FIG. 2 is a configuration diagram showing the configuration of the optical integrated unit 1 shown in FIG. As shown in FIG. 2, the optical integrated unit 1 includes a semiconductor laser as a light source 11 (hereinafter referred to as the semiconductor laser 11), a light receiving element (light receiving means) 12, and a polarization beam splitter (light guiding means). 14, a polarization diffraction element (diffractive means) 15, a holder 51, and a holder 52. The semiconductor laser 11 is housed in a package 18, and the light receiving element 12 is housed in a package 19.

  Next, the arrangement of each component will be described with reference to FIG. In the following description, for convenience of explanation, the surface of the polarization beam splitter 14 on which the light beam 20 emitted from the semiconductor laser 11 is incident is the light beam incident surface of the polarization beam splitter 14, and the return light from the polarization beam splitter 14 is The incident surface is a return light incident surface of the polarization beam splitter 14. Further, the surface of the polarization diffraction element 15 on which the light beam 20 emitted from the semiconductor laser 11 is incident is the light beam incident surface of the polarization diffraction element 15, and the surface of the polarization diffraction element 15 on which the return light is incident is polarization diffraction element 15. The return light incident surface.

  The polarization beam splitter 14 and the semiconductor laser 11 housed in the package 18 are fixed to a holder 51.

  On the other hand, the light receiving element 12 is held by a holder 51 so as to be movable in a plane orthogonal to the optical axis of the return light emitted from the polarization beam splitter 14.

  More specifically, it is as follows. The light receiving element 12 housed in the package 19 is fixed to the holder 52. The holder 51 is provided with a space for receiving the light receiving element 12 at a position where the return light incident on the polarizing beam splitter 14 is emitted from the polarizing beam splitter 14 again. In the space, the light receiving element 12 and the package 19 are provided. , And the holder 52 are integrally arranged. The holder 52 can slide with respect to the holder 51. That is, the light receiving element 12 can be moved in the xy plane shown in the figure.

  The polarization diffraction element 15 is disposed on the optical axis 21 of the light beam emitted from the semiconductor laser 11 so that the light beam incident surface faces the return light incident surface of the polarization beam splitter 14. Yes. For this reason, by sliding the polarization diffraction element 15 on the polarization beam splitter 14, the polarization diffraction element 15 can be moved in the xy plane shown in the figure. That is, the polarization diffraction element 15 is held so that it can move in a plane orthogonal to the optical axis of the return light reflected by the optical disk.

  As described above, the semiconductor laser 11 that emits the light beam 20 having the wavelength λ = 405 nm is used. The light beam 20 is linearly polarized light (P-polarized light) having a polarization vibration plane in the x direction with respect to the illustrated optical axis direction (z direction). The light beam 20 emitted from the semiconductor laser 11 enters the polarization beam splitter 14.

  The polarization beam splitter 14 has a polarization beam splitter (PBS) surface (functional surface) 14a and a reflection mirror (reflection surface) 14b. The PBS surface 14a is arranged so as to intersect the optical axis 21 of the P-polarized light beam emitted from the semiconductor laser 11 and transmit the light beam 20. The reflection mirror 14b is disposed so as to be parallel to the PBS surface 14a and to face the light receiving surface of the light receiving element 12.

  The PBS surface 14a transmits linearly polarized light (P-polarized light) having a polarization vibration surface in the x direction with respect to the illustrated optical axis direction (z direction), and has a polarization vibration surface perpendicular to the polarization vibration surface. , It has a characteristic of reflecting linearly polarized light (S-polarized light) having a polarization vibration plane in the y direction with respect to the illustrated optical axis direction (z direction).

  On the other hand, the reflection mirror 14b has a property of reflecting at least S-polarized light, and the S-polarized light reflected by the PBS surface 14a and incident on the reflection mirror is further reflected by the reflection mirror 14b.

  Next, the light beam 20 (P-polarized light) transmitted through the PBS surface 14 a is incident on the polarization diffraction element 15.

  Next, the polarization diffraction element 15 will be described in detail. The polarization diffraction element 15 includes a first polarization hologram element 31 and a second polarization hologram element 32. The first polarization hologram element 31 and the second polarization hologram element 32 are both disposed on the optical axis 21 of the light beam 20, and the first polarization hologram element 31 is the second polarization hologram. It is configured to be disposed closer to the semiconductor laser 11 than the element 32.

  The first polarization hologram element 31 diffracts P-polarized light and transmits S-polarized light, and the second polarization hologram element 32 diffracts S-polarized light and transmits P-polarized light. The diffraction of these polarized light is performed by the groove structure (grating) formed in each polarization hologram element 31 and 32, and the diffraction angle is defined by the pitch of the grating (hereinafter referred to as the grating pitch).

  The first polarization hologram element 31 has a three-beam generating hologram pattern for detecting a tracking error signal (TES).

  That is, when the P-polarized light beam 20 transmitted through the PBS surface 14a is incident on the first polarization hologram element 31, it is diffracted and is diffracted into three beams (a main beam and two beams for detecting a tracking error signal (TES)). And is emitted from the first polarization hologram element 31. The detailed hologram pattern of the first polarization hologram element 31 will be described later. As a TES detection method using three beams, a three-beam method, a differential push-pull (DPP) method, a phase shift DPP method, or the like can be used.

  Of the incident light, the second polarization hologram element 32 diffracts S-polarized light and transmits P-polarized light as it is. Specifically, the second polarization hologram element 32 diffracts incident S-polarized light and separates it into zero-order diffracted light (non-diffracted light) and ± first-order diffracted light (diffracted light).

  That is, the P-polarized light beam 20 emitted from the first polarization hologram element 31 is incident on the second polarization hologram element 32 and is transmitted as it is. The detailed hologram pattern of the second polarization hologram element 32 will be described later.

  As shown in FIG. 3, the P-polarized light beam 20 emitted from the optical integrated unit 1 is collimated by the collimator lens 2 and then enters the quarter-wave plate 5. The P-polarized light beam 20 is converted into circularly polarized light by the quarter-wave plate 5 and condensed on the recording layer of the optical disk 4 by the objective lens 3.

  The light beam reflected by the optical disk 4, that is, the return light passes through the objective lens 3 again and enters the quarter-wave plate 5 again. The return light is converted into linearly polarized light (S-polarized light) having a polarization vibration plane in the y direction with respect to the optical axis direction (z direction) shown by the quarter wavelength plate 5. Then, the light is condensed by the collimator lens 2 and enters the second polarization hologram element 32 of the optical integrated unit 1.

  As described above, the S-polarized return light incident on the second polarization hologram element 32 is separated into zero-order diffracted light (non-diffracted light) and ± first-order diffracted light (diffracted light) and is emitted. The diffracted S-polarized return light (0th-order diffracted light and ± 1st-order diffracted light) is incident on the first polarization hologram element 31 and is transmitted as it is. Next, the S-polarized return light enters the polarization beam splitter 14, is reflected by the PBS surface 14a, is further reflected by the reflection mirror 14b, and is emitted from the polarization beam splitter 14. The S-polarized return light emitted from the polarization beam splitter 14 is received by the light receiving element 12. The light receiving part pattern of the light receiving element 12 will be described later.

  Next, a hologram pattern formed on the first polarization hologram element 31 will be described with reference to FIG.

  The grating pitch in the first polarization hologram element 31 is designed so that the three beams are sufficiently separated on the light receiving element 12. This is to reduce the signal crosstalk between the light receiving portions that receive the three beams.

  On the other hand, the smaller the distance between the main beam and the sub beam on the optical disk 4 is, the smaller the offset of the tracking error signal generated due to the influence of the assembly error is. However, the main beam and the sub beam on the light receiving element 12 are preferable. The interval is determined at the same time. Therefore, when the distance between the main beam and the sub beam on the optical disk 4 cannot be sufficiently narrowed, the tracking error signal offset generated by the influence of the assembly error is small compared to the three-beam method or the DPP method. It is preferable to employ the phase shift DPP method having the tracking error signal detection method.

  FIG. 4 is a schematic diagram showing a hologram pattern formed on the first polarization hologram element 31. The hologram pattern may be a regular linear grating for detecting a tracking error signal (TES) using a three-beam method or a differential push-pull method (DPP method), but is disclosed in Patent Document 4 here. A case where the existing phase shift DPP method is employed will be described.

  The hologram pattern of the first polarization hologram element 31 in FIG. 4 is composed of two regions, a region 31a and a region 31b. The region 31a and the region 31b have a phase difference of 180 degrees in the periodic structure. By adopting such a periodic structure, the push-pull signal amplitude of the sub beam becomes almost zero, and the offset can be canceled with respect to the objective lens shift and the disc tilt. As the light beam 20 on the first polarization hologram element 31 is more accurately aligned with respect to the region 31a and the region 31b, a better offset canceling performance is obtained.

  Next, a hologram pattern formed on the second polarization hologram element 32 will be described with reference to FIG.

  FIG. 5 is a schematic diagram showing a hologram pattern formed on the second polarization hologram element 32. The hologram pattern of the second polarization hologram element 32 includes three regions 32a, 32b, and 32c. Specifically, one semicircular region 32c divided into two by an x-direction boundary line 32x corresponding to the tracking direction, an inner peripheral region 32a in which the other semicircular region is further divided by an arc-shaped boundary line, and This is the outer peripheral region 32b. In the figure, the return light is indicated by a dotted line.

  The grating pitch in each region of the second polarization hologram element 32 is the smallest in the region 32b (maximum diffraction angle), the largest in the region 32a (minimum diffraction angle), and the region 32c is an intermediate numerical value between them. It has become.

  As will be described later, a spherical aberration error signal (SAES) used for correcting spherical aberration is provided in the light receiving element 12 with −1st order diffracted light from the region 32a and + 1st order diffracted light from the region 32b and the region 32c. It can be detected by receiving light by the light receiving unit and calculating a detection signal generated by the light receiving unit.

  Further, the focus error signal (FES) used for correcting the focal position deviation can be detected by the double knife edge method using the −1st order diffracted light from the region 32c and the + 1st order diffracted light from the regions 32a and 32b.

  In this embodiment, 0th-order diffracted light (non-diffracted light) is used for detection of an RF signal and a high-speed signal such as a TES signal of the DPD method.

  The first polarization hologram element 31 and the second polarization hologram element 32 can be integrally manufactured by accurately positioning with mask accuracy. Polarization diffraction element 15 Polarization diffraction element 15 Therefore, the position adjustment of the first polarization hologram element 32 is completed simultaneously with the position adjustment of the second polarization hologram element 32 so as to obtain a predetermined servo signal. That is, it is possible to easily assemble and adjust the optical integrated unit 1 and to obtain an effect of high adjustment accuracy.

  6A and 6B are explanatory diagrams for explaining the relationship between the division pattern of the second polarization hologram element 32 and the light receiving portion pattern of the light receiving element 12 provided in the optical integrated unit of the present embodiment. . 6A, the position of the collimator lens 2 in the optical axis direction is adjusted so that spherical aberration does not occur in the condensed beam by the objective lens 3 with respect to the thickness of the cover layer 4b of the optical disk 4 in FIG. 2 shows a light beam on the light receiving element 12 when the light is focused on the recording layer 4c in a focused state.

  The return light of the light beam reflected by the optical recording medium is separated into non-diffracted light and diffracted light by the diffraction means provided on the optical axis of the return light. That is, as shown in FIG. 2, the three light beams (main beam and two sub beams) formed by the first polarization hologram element 31 in the outward optical system are reflected by the optical disk 4 and are then returned to the optical system. 2 are separated into non-diffracted light 22 (0th order diffracted light) and diffracted light 23 (± 1st order diffracted light) by the second polarization hologram element 32, respectively.

  A hologram pattern is blazed on the second polarization hologram element 32. In other words, the cross-sectional shape of the grating is formed into a slope shape or a staircase shape so that the light intensity of the diffracted light of a specific order is increased. In the present embodiment, the region 32a and the region 32b have a cross-sectional shape in which the light intensity concentrates on the + 1st order diffracted light, and the region 32c has a light intensity concentrate on the −1st order diffracted light.

  The light receiving element 12 includes a light receiving unit that receives the non-diffracted light 22 (0th order diffracted light) and the diffracted light 23 (± 1st order diffracted light). The light receiving element is not necessarily provided with a light receiving unit for receiving all diffracted light and non-diffracted light separated by the second polarization hologram element 32, and among these, it is necessary for detecting an RF signal and a servo signal. It is sufficient that a light receiving unit for receiving a light beam is provided.

  In the present embodiment, as shown in FIG. 6A, the second polarization hologram element 32 causes three 0th-order diffracted lights 40, six + 1st-order diffracted lights 41, and three −1st-order diffracted lights 42 to A total of 12 beams are formed. In order to receive a light beam used for detection of an RF signal or a servo signal among these light beams, the light receiving element 12 receives three light receiving portions 12A to 12C that receive 0th-order diffracted light and +1 diffracted light. There are six light receiving parts including two light receiving parts 12D and 12E and a light receiving part 12F that receives -1st order diffracted light.

  Among the light receiving parts, the light receiving part 12A (first light receiving part) that receives non-diffracted light is divided into four light receiving cells 12a to 12d by two straight lines that pass through the center of the light receiving part and are orthogonal to each other. Yes. The detection signals including the four output signals output from the four light receiving cells 12a to 12d are used as detection signals for adjusting the mounting position of the light receiving element 12, as will be described in detail later. On the other hand, each of the light receiving portions 12B to 12F is divided into two light receiving cells by a straight line crossing the light receiving portion. Accordingly, the light receiving element 12 includes a total of 14 light receiving cells 12a to 12n.

  Of the light beams formed by the second polarization hologram element 32, the 0th-order diffracted light 40 is designed to be a light beam having a sufficient beam diameter to enable TES detection by the push-pull method. The In the present embodiment, the light receiving element 12 is slightly behind the condensing point of the 0th-order diffracted light 40 so that the beam diameter of the 0th-order diffracted light 40 has a certain size (the traveling direction of the 0th-order diffracted light 40). Along the back side). The present invention is not limited to this, and the light receiving element 12 may be installed at a position shifted to the near side of the traveling direction with respect to the condensing point of the 0th-order diffracted light 40.

  In this way, the light beam having a certain size of light beam diameter is condensed near the center of the light receiving unit 12A (that is, the intersection of the straight lines dividing the four light receiving cells 12a to 12d). The position of the light receiving element 12 relative to the non-diffracted light 22 can be adjusted by adjusting the output signals output from the four light receiving cells 12a to 12d to be equal by the adjusting method.

  FIG. 6B shows a light beam on the light receiving element 12 when the objective lens 3 in FIG. 3 approaches the optical disc 4 from the state of FIG. As the objective lens 3 approaches the optical disc 4, the beam diameter of the light beam increases. However, the light beam does not protrude from the light receiving unit.

  Thus, by using both the + 1st order diffracted light and the −1st order diffracted light, the offset adjustment of the FES signal of the double knife edge method can be reliably performed by adjusting the rotation of the optical axis center of the polarization diffraction element 15. There is.

  Next, the operation of generating an RF signal and a servo signal will be described with reference to FIGS. 5 and 6A and 6B. Here, the output signals of the light receiving cells 12a to 12n are represented as Sa to Sn.

The RF signal (RF) is detected using non-diffracted light. That is, the RF signal (RF) is
RF = Sa + Sb + Sc + Sd
Can be given in

  The tracking error signal (TES1) by the DPD method is detected by performing a phase comparison of Sa to Sd. Specifically, the following principle is used. When the light beam condensed by the objective lens 3 scans the pit row formed on the recording layer 4c of the optical disc 4, the intensity distribution pattern of the reflected beam changes depending on the positional relationship between the pit row and the light beam. Therefore, when (Sa + Sc) and (Sb + Sd) are detected, the light beam is in the same phase when scanning the center of the pit row, but the position where the light beam is shifted from the center of the pit row is scanned. In such a case, a phase difference in the opposite direction occurs depending on the direction of deviation. Therefore, a tracking error signal can be obtained by detecting the phase difference between (Sa + Sc) and (Sb + Sd).

The tracking error signal (TES2) by the phase shift DPP method is
TES2 = {(Sa + Sb)-(Sc + Sd)}
−α {(Se−Sf) + (Sg−Sh)}
Given in. Here, α is set to an optimum coefficient for canceling offset due to objective lens shift or optical disc tilt.

The focus error signal (FES) is detected using a double knife edge method. That is, FES is
FES = (Sm−Sn) − {(Sk + Si) − (Sl + Sj)}
Given in.

  As described above, in this embodiment, a large capacity is realized by using an objective lens having a numerical aperture NA of 0.85 and a laser beam having a wavelength of 405 nm. However, in an optical disk with a large capacity, the influence of aberration becomes a problem as the numerical aperture NA of the objective lens increases.

  When the laser beam is irradiated onto the recording area of the optical disc, the cover layer between the incident surface of the laser beam and the recording layer is a distance through which the laser beam irradiated onto the recording layer on which information is recorded is transmitted. The spherical aberration caused by the error in the thickness t (hereinafter referred to as the disc substrate thickness t) increases in proportion to the fourth power of the numerical aperture NA. In order to suppress this spherical aberration, it is effective to reduce the dimensional tolerance of the disk substrate thickness t. For example, a CD disk substrate thickness t of a CD having a laser beam wavelength of 780 nm and a numerical aperture NA of 0.45 is ± 100 μm, a laser beam wavelength of 650 nm, and a numerical aperture NA of 0.6. While the dimensional tolerance of the disk substrate thickness t is ± 30 μm, the disk substrate thickness of the next-generation high-density optical disk in which the wavelength of the laser beam is 405 nm and the numerical aperture NA is 0.85, as in this embodiment. The dimensional tolerance of the length t is ± 3 μm. Thus, as the capacity is increased, the manufacturing accuracy of the disk becomes stricter in terms of acceleration.

  However, since the error of the disk substrate thickness t depends on the manufacturing method of the optical disk, there is a problem that it is very difficult to increase the dimensional accuracy of the disk substrate thickness t. Also, increasing the dimensional accuracy of the disk substrate thickness t has the disadvantage of increasing the manufacturing cost of the optical disk. Therefore, the optical pickup device is required to have a function of correcting spherical aberration that occurs when reproducing an optical disk.

  In general, spherical aberration correction is performed by mechanically moving a lens such as a beam expander. In order to perform this spherical aberration correction accurately and at high speed, it is necessary to detect a spherical aberration error signal which is a target of spherical aberration correction.

  Also in the present embodiment, the position of the collimator lens 2 is adjusted in the optical axis direction by a collimator lens driving mechanism (not shown) in order to correct the spherical aberration caused by the thickness error of the cover layer 4b. .

  Various methods have been proposed for detecting a spherical aberration correction signal for controlling such a drive mechanism. For example, there is a method in which return light is separated into two light beams by a hologram element and a spherical aberration error signal is detected based on the focal position of the light beam (see Patent Document 5).

Also in this embodiment, the spherical aberration error signal (SAES) is detected by using a detection signal from the light beam separated into the inner and outer circumferences. That is, SAES is
SAES1 = (Sk−Sl) −β (Si−Sj)
SAES2 = (Sk−Sl) −β (Sm−Sn)
SAES3 = (Si-Sj)-[beta] (Sm-Sn)
Given in either Here, β is set to an optimum coefficient for canceling the SAES offset.

  FIG. 7 shows a light receiving element when the optical disc 4 is located at the focal point of the objective lens 3 in a state where spherical aberration is generated in the focused beam of the objective lens 3 due to the thickness error of the cover layer 4 b in the optical disc 4. FIG. 12 is a diagram illustrating the shape of a light beam on 12;

  In the optical integrated unit 1 according to the present embodiment, the light receiving element 12 housed in the package 19 is held by the holder 51 via the holder 52, but the present invention is not necessarily limited to this. Absent. That is, for example, as shown in FIG. 8, the light receiving element 12 (light receiving means) and the polarization beam splitter 14 (light guiding means) may be integrated.

  The optical integrated unit will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same member as FIG. 2, and description is abbreviate | omitted.

  As shown in FIG. 8, the semiconductor laser 11 housed in the package 18 is fixed to a holder 51. On the other hand, the light receiving element 12 housed in the package 19 is fixed to the polarization beam splitter 14. Further, the polarization beam splitter 14 is fixed to the holder 52. Therefore, by sliding the holder 52 on the holder 51, it is possible to move the integrated light receiving element 12 and the polarizing beam splitter 14 within the xy plane shown in the drawing.

  In the optical integrated unit 1 shown in FIG. 8, the light receiving element 12 and the polarization beam splitter 14 are moved together to adjust the mounting position of the light receiving element 12. For this reason, the relative position of the light receiving element 12 and the polarization beam splitter 14 does not change when the optical integrated unit 1 is adjusted. Therefore, it is not necessary to secure a margin for the polarization beam splitter 14 in consideration of a change in the mounting position of the light receiving element 12, and if the accuracy when the light receiving element 12 and the polarization beam splitter 14 are integrated is increased, the polarization beam splitter 14 is It becomes possible to make it smaller. That is, the optical integrated unit 1 can be reduced in size and weight.

  Furthermore, since the polarization beam splitter 14 can also function as a cover glass of the light receiving element 12, the light receiving surface of the light receiving element 12 can be protected without increasing the thickness dimension.

  Next, a method for manufacturing an optical integrated unit according to the present embodiment will be described based on the flowchart shown in FIG. In the method of manufacturing an optical integrated unit according to the present embodiment, the optical integrated unit 1 is adjusted in advance in the manufacturing apparatus 9 shown in FIG. 3 prior to mounting on the optical pickup device.

  The optical integrated unit manufacturing apparatus 9 shown in FIG. 3 is composed of the same members as the optical pickup apparatus 8 shown in FIG. However, the objective lens 3, the collimator lens 2, the quarter wavelength plate 5, and the optical disk 4 are incorporated on the optical integrated unit manufacturing apparatus side, and only the optical integrated unit 1 can be adjusted and attached / detached.

  By adjusting the optical integrated unit 1 in advance by a manufacturing apparatus 9 corresponding to the optical pickup device 8 on which the optical integrated unit 1 is mounted, mechanical parts and adjustments for adjusting the optical integrated unit 1 to the optical pickup device 8 There is no need to secure extra space for. As a result, the degree of freedom of component arrangement of the optical pickup device 8 is increased, and the size and weight can be reduced.

  It is to be noted that the two-dimensional position adjustment of the semiconductor laser 11 in the xy-axis direction and the position adjustment of the collimator lens 2 in the x-axis direction are performed so that parallel light in the reference axis direction is emitted. Is the same. In the following description, description on the above steps is omitted, and subsequent adjustment steps, that is, first detection signals (output signals Sa to Sd) generated in the first light receiving unit (light receiving unit 12A) by non-diffracted light. The step of adjusting the mounting position of the light receiving means (light receiving element 12) based on the first and second detection signals (output signals Si to Sn) generated in the second light receiving parts (light receiving parts 12D to 12F) by diffracted light The step of adjusting the attachment position of the diffractive means (polarized light diffraction element 15) using) will be described.

  The step of adjusting the mounting position of the light receiving means based on the first detection signal generated in the first light receiving unit by the non-diffracted light includes the following steps S1 to S3.

  (1) The light receiving means is moved in a plane perpendicular to the optical axis of non-diffracted light or return light incident on the light receiving means (step S1). More specifically, the holder 52 is slid with respect to the holder 51 and the light receiving element 12 accommodated in the package 19 is moved.

  (2) It is determined whether the non-diffracted light is correctly incident on the first light receiving unit based on the first detection signal (step S2). Specifically, it is determined whether the four output signals Sa, Sb, Sc, and Sd output from the four light receiving cells 12a to 12d included in the light receiving unit 12A that receives the non-diffracted light are equal. More specifically, it is determined whether the difference between the four output signals, | Sa−Sb |, | Sa−Sd |, | Sb−Sc |, and | Sc−Sd | .

  The determination is not limited to determining whether the output signals Sa, Sb, Sc, and Sd are equal, and it can be determined whether the non-diffracted light is correctly incident on the first light receiving unit. Anything is fine. That is, for example, the x direction adjustment signal = (Sa + Sb) − (Sc + Sd) and the y direction adjustment signal = (Sa + Sd) − (Sb + Sc) are substantially zero (that is, the x direction adjustment signal and the y direction adjustment signal). It is also possible to determine whether the non-diffracted light is correctly incident on the first light receiving unit.

  (3) If it is determined in step S2 that the non-diffracted light is correctly incident on the first light receiving portion, the position of the light receiving means is fixed (step S3). More specifically, the position adjustment is performed in a state in which the holder 52 to which the light receiving element 12 housed in the package 19 is fixed is temporarily fixed to the holder 51 by applying UV adhesive or the like to the joint surface with the holder 51. When the first detection signal is within the target range, the UV adhesive is cured by irradiating the bonding surface between the holder 52 and the holder 51 with ultraviolet rays, and the light receiving element 12 is transferred to the holder 51 via the holder 52. What is necessary is just to fix.

  If it is determined in step S2 that the non-diffracted light is not correctly incident on the first light receiving unit, the process returns to step S1, and again based on the detection signal detected by the first light receiving unit in step S2. The light receiving means is moved in a plane perpendicular to the optical axis of the return light. That is, step S1 and step S2 are repeated until it is determined in step S2 that the non-diffracted light is correctly incident on the first light receiving unit.

  The step of adjusting the attachment position of the diffractive means based on the second detection signal generated by the diffracted light in the second light receiving unit includes the following steps S4 to S6.

  (4) The diffractive means is translated in a plane perpendicular to the optical axis of the return light incident on the diffractive means, and the diffractive means is rotated around the optical axis of the return light incident on the diffractive means (step S4). . More specifically, the polarization diffraction element 15 is slid on the polarization beam splitter 14, the position of the polarization diffraction element 15 in the xy plane is adjusted, and the optical axis of the return light incident on the polarization beam splitter 14 is the rotation axis. And angle adjustment.

  (5) Based on the second detection signal, it is determined whether the return light is correctly incident on the diffraction means (step S5). Specifically, the output signals Si, Sj, Sk generated in the light receiving cells 12i, 12j, 12k, 12l, 12m, and 12n that receive the diffracted light 23 generated by the diffraction by the second polarization hologram element 32 are provided. It is determined whether FES and SAES obtained by calculation from Sl, Sm, and Sn are predetermined signals. Specific forms of FES and SAES obtained by calculation in this step will be described later.

  (6) If it is determined in step S5 that the return light is correctly incident on the diffractive means, the position of the diffractive means is fixed (step S6). More specifically, the position adjustment and the angle adjustment are performed in a state where a UV adhesive is applied to the polarization diffraction element 15 and temporarily fixed to the polarization beam splitter 14, and when the second detection signal is within the target range, The polarizing diffraction element 15 may be fixed to the polarizing beam splitter by irradiating the bonding surface between the polarizing diffraction element 15 and the polarizing beam splitter 14 with ultraviolet rays to cure the UV adhesive.

  If it is determined in step S6 that the return light is not correctly incident on the second light receiving unit, the process returns to step S4, and diffraction is performed again based on the detection signal detected by the second light receiving unit in step S5. The means is translated in a plane perpendicular to the optical axis of the return light incident on the diffraction means, and the diffraction means is rotated around the optical axis of the return light incident on the diffraction means.

  Each of the above steps will be described in more detail with reference to FIG. 9 and FIG.

  First, the position adjustment of the light receiving means will be described with reference to FIG.

  In the initial state where the position adjustment of the light receiving element 12 and the position adjustment and the angle adjustment of the polarization diffraction element 15 are not performed, the positional relationship between the light reception element 12 and the return light is shifted, and the mounting angle of the polarization diffraction element 15 is also shifted. Yes. In this state, the positional relationship between the condensing spot of the non-diffracted light 22 (0th order diffracted light) and the diffracted light 23 (± 1st order diffracted light) incident on the light receiving element 12 and the light receiving unit provided in the light receiving element 12 is For example, as shown in FIG.

  In step S1 and step S2, when the non-diffracted light transmitted through the polarization diffraction grating 32 is detected and the position is adjusted in a plane perpendicular to the return light of the light receiving element 12, the non-diffracted light 22 incident on the light receiving element 12 is obtained. The positional relationship between the condensing spots of (0th-order diffracted light) and diffracted light 23 (± 1st-order diffracted light) and the light receiving unit provided in the light receiving element 12 is as shown in FIG. 9B, for example. That is, when step S2 is completed, the center of the optical axis of the return light and the center of the light receiving element 12 are correctly matched.

  Next, rotation adjustment of the diffraction means will be described with reference to FIG.

  Since the attachment angle of the polarization diffraction element 15 is not adjusted at the stage where step S3 is completed, the condensed spot of the diffracted light 23 (± first-order diffracted light) incident on the light receiving element 12 is shifted from a predetermined position. This state is shown in FIG. In steps S4 and S5, when the diffracted light diffracted by the polarization diffraction element 15 is detected and the mounting angle of the polarization diffraction element 15 is adjusted, the non-diffracted light 22 (0th order diffracted light) and diffracted light incident on the light receiving element 12 are detected. FIG. 10B shows the positional relationship between the condensing spot of 23 (± first-order diffracted light) and the light receiving portion provided in the light receiving element 12. That is, the non-diffracted light separated by the polarization diffraction element 15 is accurately incident on each light receiving portion provided in the light receiving element 12.

Further, whether or not the return light in step S5 is correctly incident on the polarization diffraction element 15 is determined independently with respect to the x direction, the y direction, and the angle shown in FIG. That is, the determination regarding the x direction is
Using detection signals generated in the light receiving cells 12i to 12l,
Si + Sj = γ (Sk + Sl)
Is determined by whether or not Here, γ is a constant determined by the ratio between the size of the region 32a and the magnitude of the return light and the intensity distribution of the return light. For the y-axis direction, detection signals generated in the light receiving cells 12i to 12n are used,
Sm + Sn = Si + Sj + Sk + Sl
Is determined by whether or not Furthermore, with respect to the mounting angle, in the best RF signal state (that is, a state in which the maximum RF signal signal amplitude is obtained when the focus servo and tracking servo are applied),
FES = (Sm−Sn) − {(Si−Sj) + γ (Sk−Sl)} = 0
What is necessary is just to determine whether or not.

  In step S1, as described above, the light receiving element 12 is preferably moved in a plane perpendicular to the optical axis of non-diffracted light or return light incident on the light receiving element 12. Although the present invention is not necessarily limited to this, the light receiving elements 12A to 12F are moved by moving the light receiving element 12 in a plane perpendicular to the optical axis of the non-diffracted light or return light incident on the light receiving element 12. In the light receiving surface where the light is received, the position of the focused spot focused on each light receiving unit is adjusted without changing the size and shape of the focused spot of non-diffracted light or return light incident on the received light surface. It becomes possible to do. For this reason, it becomes easy to adjust the attachment position of the light receiving element 12 based on the first detection signal. Further, if the optical axis of non-diffracted light or return light is orthogonal to the light receiving surface, the mounting position of the light receiving element 12 can be adjusted while maintaining the orthogonality between the optical axis and the light receiving surface. Become. For this reason, there exists an effect that the attachment position accuracy of the light receiving means is further improved.

  In the method of manufacturing an optical integrated unit according to the present invention, as described above, the steps (S4 to S6) of adjusting the attachment position of the diffraction means are the steps (S1 to S3) of adjusting the attachment position of the light receiving means. ) Is preferably performed after. Although this invention is not necessarily limited to this, by performing the process (S4-S6) of adjusting the attachment position of a diffraction means after the process (S1-S3) of adjusting the attachment position of a light-receiving means, It is possible to adjust the attachment position of the diffraction means in a state where the light receiving means is accurately positioned. For this reason, it becomes possible to improve the adjustment accuracy of the attachment position of the diffraction means with respect to the light receiving means.

  Next, another method for manufacturing an optical integrated unit according to the present embodiment will be described based on the flowchart shown in FIG.

  The difference between the flowchart shown in FIG. 11 and the flowchart shown in FIG. 1 is that a step of recording the first detection signal as an adjustment error is added as step S7 between steps S3 and S4. According to the manufacturing method of the optical integrated unit shown in FIG. 11, when the optical pickup device including the optical integrated unit manufactured by the manufacturing method is manufactured, the detection signal recorded as the adjustment error of the light receiving means in step S7 is used. By referring to and adjusting the optical pickup device so as to reproduce the detection signal, it becomes possible to improve the manufacturing accuracy of the optical pickup device.

  Further, another manufacturing method of the optical integrated unit according to the present embodiment will be described based on the flowchart shown in FIG.

  The difference between the flowchart shown in FIG. 12 and the flowchart shown in FIG. 1 is that step S8 is added between step S3 and step S4. Step S8 is a step of attaching diffraction means to the optical integrated unit. That is, in the method of manufacturing an optical integrated unit shown in FIG. 12, before the diffraction means is attached to the optical integrated unit (that is, in a state where no diffraction means is attached), the same optical path as the non-diffracted light is provided. As described above, the mounting position of the light receiving means is adjusted based on the detection signal generated in the first light receiving unit by the return light incident on the first light receiving unit. FIG. 13 shows the optical integrated unit 1 in a state where the polarization diffraction element 15 as the diffractive means is not attached.

  According to the manufacturing method described above, it is possible to adjust the position of the light receiving means in steps S1 to S3 after reliably eliminating the influence of the diffraction means. For this reason, the influence of the intensity distribution change due to the diffraction efficiency variation of the diffractive means is eliminated, and the position of the light receiving means can be adjusted more accurately.

  In addition, as shown in FIG. 14, the steps from S1 to S3 are performed by placing the transparent substrate 53 (transparent member) having the same refractive index and the same thickness as the diffracting means at the same position as the polarizing diffraction element 15 (diffracting means). It is also preferable to carry out in the state arrange | positioned. That is, before attaching the diffractive means to the optical integrated unit, a transparent member having the same refractive index and the same thickness as the diffractive means is disposed at the same position as the diffractive means, passes through the transparent member, and transmits the non-diffracted material. It is also preferable that the mounting position of the light receiving means is adjusted based on a detection signal generated in the first light receiving unit by return light incident on the first light receiving unit through the same optical path as the light.

  According to the above manufacturing method, it is possible to accurately adjust the position of the light receiving means while eliminating the influence of the diffractive means while maintaining the state in which spherical aberration equivalent to that when the diffractive means is attached to the optical integrated unit is maintained. It becomes possible.

  As described above, in the optical integrated unit manufactured by the manufacturing method according to the present embodiment, the position of the light receiving element 12 and the polarization beam splitter 14 can be accurately adjusted with respect to the semiconductor laser 11. It is. Therefore, even when the general-purpose semiconductor laser 11 housed in the package 18 or the general-purpose light-receiving element 12 housed in the package 19 is used as the light source and the light-receiving means, the return light is reliably incident on the light-receiving element 12. It is possible to manufacture a highly accurate optical integrated unit by adjusting the mounting position of the light receiving element 12 and the polarization beam splitter 14.

  Therefore, even when a general-purpose semiconductor laser and a general-purpose light receiving element are used, it is possible to employ a light receiving element having a smaller area of the light receiving portion that receives non-diffracted light. For this reason, high-speed signal detection can be performed satisfactorily. Further, in this case, since the general-purpose semiconductor laser 11 and the general-purpose light receiving element 12 are used, repair in the case of failure of these is facilitated.

  Further, since the position of the diffractive means is accurately positioned with respect to the return light and at the same time with respect to the forward light beam, the phase shift DPP in which positioning with the light beam is important as the diffractive means. Good characteristics can be obtained even if a pattern for law or a pattern for intensity distribution correction is provided.

  The manufacturing apparatus 9 for manufacturing an optical integrated unit by the method for manufacturing an optical integrated unit according to the present invention is connected to the optical integrated unit and receives a detection signal generated in a first light receiving unit included in the optical integrated unit. It is preferable to include an input unit that inputs, an arithmetic unit that calculates an error signal from the detection signal, and an output unit that outputs the error signal.

Accordingly, the mounting positions of the light receiving means and the diffracting means can be adjusted manually or by another adjusting device provided based on the error signal output to the output section.
[Embodiment 2]
The manufacturing method of the optical pickup device according to the present embodiment will be described as follows with reference to FIGS. In the following description, it is assumed that the optical integrated unit 1 shown in FIG. 2 described in the first embodiment is mounted on the optical pickup device, and the optical integrated unit mounted on the optical pickup device is described. Will not repeat.

  As described above, FIG. 15 is a diagram illustrating the structure of the optical pickup device 8. The difference from the optical integrated unit manufacturing apparatus shown in FIG. 3 is that a light emitting unit 6 is constituted by the optical integrated unit 1 and the collimator lens 2, and the objective lens driving unit is constituted by the objective lens 3 and an objective lens driving mechanism (not shown). 7 is configured.

  The light emitting unit 6 and the objective lens driving unit 7 are held so that the relative positions of the light emitting unit 6 and the objective lens driving unit 7 can be adjusted based on a method of manufacturing an optical pickup device described later.

  Regarding the method of manufacturing the optical pickup device according to the present invention, in particular, the relative mounting position of the objective lens 3 and the optical integrated unit 1 is adjusted based on the detection signal generated in the first light receiving unit by the non-diffracted light. The process to perform is demonstrated.

  First, the process of adjusting the relative attachment position of the objective lens 3 and the optical integrated unit 1 by moving the objective lens 3 in a plane perpendicular to the optical axis 21 of the light beam emitted from the optical integrated unit 1. Will be described based on the flowchart shown in FIG.

  (1) The objective lens is moved in a plane perpendicular to the optical axis of the light beam (step S11). Speaking of the optical pickup device 8, the objective lens driving unit 7 having the objective lens 3 and the objective lens driving mechanism is moved in a plane perpendicular to the optical axis 21 of the light beam emitted from the optical integrated unit. .

  (2) Based on the detection signal generated in the first light receiving unit by the non-diffracted light, it is determined whether the non-diffracted light is correctly incident on the first light receiving unit (step S12). Specifically, it is determined whether the four output signals Sa, Sb, Sc, and Sd output from the four light receiving cells 12a to 12d included in the light receiving unit 12A that receives non-diffracted light are equal. More specifically, it is determined whether the difference between the four output signals, | Sa−Sb |, | Sa−Sd |, | Sb−Sc |, and | Sc−Sd | .

  The determination is not limited to determining whether the output signals Sa, Sb, Sc, and Sd are equal, and it can be determined whether the non-diffracted light is correctly incident on the first light receiving unit. Anything is fine. For example, the x-direction adjustment signal = (Sa + Sb) − (Sc + Sd) and the y-direction adjustment signal = (Sa + Sd) − (Sb + Sc) are almost zero (that is, the x-direction adjustment signal and the y-direction adjustment signal are It is also possible to determine whether or not the non-diffracted light is correctly incident on the first light receiving unit by determining whether or not each is equal to or less than a predetermined threshold.

  (3) If it is determined in step S2 that the non-diffracted light is correctly incident on the first light receiving unit, the position of the objective lens is fixed (step S13). More specifically, when the above-mentioned position adjustment is performed in a state where a UV adhesive is applied to the objective lens driving unit 7 and temporarily fixed to the housing of the optical pickup device 8, and the first detection signal is within the target range, What is necessary is just to fix the objective lens drive unit 7 to the housing of the optical pickup device 8 by curing the UV adhesive by irradiating the bonding surface coated with the UV adhesive with ultraviolet rays.

  If it is determined in step S12 that the non-diffracted light is not correctly incident on the first light receiving unit, the process returns to step S11, and again based on the detection signal detected by the first light receiving unit in step S2. The objective lens is moved in a plane perpendicular to the optical axis of the light beam. That is, step S11 and step S12 are repeated until it is determined in step S12 that the non-diffracted light is correctly incident on the first light receiving unit.

  By using the above manufacturing method, it is possible to adjust the attachment position of the objective lens driving unit 7 in accordance with the state of the servo signal at the time of recording or reproducing information with respect to the optical recording medium by the optical pickup device. Therefore, it is possible to manufacture an optical pickup device that can obtain a stable servo signal as compared with the case where the objective lens driving unit 7 is attached with mechanical accuracy.

  This is particularly effective when functions that require positioning accuracy with respect to the optical axis center, such as a three-beam diffraction grating using the phase shift DPP method and intensity distribution correction means, are integrated with the diffraction element.

  Next, the process of adjusting the relative mounting position of the objective lens 3 and the optical integrated unit 1 by moving the optical integrated unit 1 in a plane perpendicular to the optical axis of the light beam integrally with the collimator lens 2. Will be described based on the flowchart shown in FIG.

  (1) The optical integrated unit is moved integrally with the collimator lens in a plane perpendicular to the optical axis of the light beam (step S21). Speaking of the optical pickup device 8, the light emitting unit 6 including the optical integrated unit 1 and the collimator lens 2 is moved in a plane perpendicular to the optical axis 21 of the light beam emitted from the optical integrated unit.

  (2) Based on the detection signal generated in the first light receiving unit by the non-diffracted light, it is determined whether the non-diffracted light is correctly incident on the first light receiving unit (step S22). Specifically, it is determined whether the four output signals Sa, Sb, Sc, and Sd output from the four light receiving cells 12a to 12d included in the light receiving unit 12A that receives non-diffracted light are equal. More specifically, it is determined whether the difference between the four output signals, | Sa−Sb |, | Sa−Sd |, | Sb−Sc |, and | Sc−Sd | .

  The determination is not limited to determining whether the output signals Sa, Sb, Sc, and Sd are equal, and it can be determined whether the non-diffracted light is correctly incident on the first light receiving unit. Anything is fine. For example, the x-direction adjustment signal = (Sa + Sb) − (Sc + Sd) and the y-direction adjustment signal = (Sa + Sd) − (Sb + Sc) are almost zero (that is, the x-direction adjustment signal and the y-direction adjustment signal are It is also possible to determine whether or not the non-diffracted light is correctly incident on the first light receiving unit by determining whether or not each is equal to or less than a predetermined threshold.

  (3) If it is determined in step S2 that the non-diffracted light is correctly incident on the first light receiving unit, the positions of the optical integrated unit and the collimator lens are fixed (step S23). With the UV adhesive applied to the light emitting unit 6 composed of the optical integrated unit 1 and the collimator lens 2 and temporarily fixed to the housing of the optical pickup device 8, the above position adjustment is performed, and the first detection signal falls within the target range. In some cases, the light-emitting unit 6 may be fixed to the housing of the optical pickup device 8 by curing the joint surface coated with the UV adhesive by irradiating ultraviolet rays.

  If it is determined in step S22 that the non-diffracted light is not correctly incident on the first light receiving unit, the process returns to step S21, and again based on the detection signal detected by the first light receiving unit in step S22. The objective lens is moved in a plane perpendicular to the optical axis of the light beam. That is, step S21 and step S22 are repeated until it is determined in step S22 that the non-diffracted light is correctly incident on the first light receiving unit.

  By using the above manufacturing method, it is possible to reproduce the state of the servo signal at the time of recording or reproducing information with respect to the optical recording medium by the optical pickup device and adjust the mounting position of the optical integrated unit and the collimator lens.

  Further, the optical integrated unit is moved integrally with the collimator lens in a first direction within a plane perpendicular to the optical axis of the light beam, and the objective lens is moved in the first direction within a plane perpendicular to the optical axis of the light beam. A process of adjusting the relative mounting position of the objective lens 3 and the optical integrated unit 1 by moving in a second direction orthogonal to the above will be described based on the flowchart shown in FIG.

  (1) The optical integrated unit is moved in the first direction integrally with the collimator lens in a plane perpendicular to the optical axis of the light beam (step S31). Speaking of the optical pickup device 41, the light emitting unit 6 including the optical integrated unit 1 and the collimator lens 2 is moved in the x-axis direction.

  (2) The objective lens is moved in a second direction orthogonal to the first direction within a plane perpendicular to the optical axis of the light beam (step S32). Speaking of the optical pickup device 41, the objective lens driving unit 7 is moved in the y-axis direction.

  (3) Based on the detection signal generated in the first light receiving unit by the non-diffracted light, it is determined whether the non-diffracted light is correctly incident on the first light receiving unit (step S33). Specifically, for example, the x direction adjustment signal = (Sa + Sb) − (Sc + Sd) and the y direction adjustment signal = (Sa + Sd) − (Sb + Sc) are substantially zero (that is, the x direction adjustment signal and y It is only necessary to determine whether the non-diffracted light is correctly incident on the first light receiving unit by determining whether the direction adjustment signal is equal to or less than a predetermined threshold value.

  (4) If the x-direction adjustment signal becomes substantially zero, the positions of the integrated optical integrated unit and collimator lens are fixed (step S34). More specifically, when the above-mentioned position adjustment is performed in a state where a UV adhesive or the like is applied to the light emitting unit 6 and temporarily fixed to the housing of the optical pickup device 8, the UV is detected when the first detection signal is within the target range. What is necessary is just to fix the light emitting unit 6 to the housing | casing of the optical pick-up apparatus 8 by making it harden by irradiating an ultraviolet-ray to the joint surface which apply | coated the adhesive agent.

  (5) When the adjustment signal in the y direction is substantially zero, the position of the objective lens is fixed (step S35). More specifically, when the above-mentioned position adjustment is performed in a state where a UV adhesive is applied to the objective lens driving unit 7 and temporarily fixed to the housing of the optical pickup device 8, and the first detection signal is within the target range, What is necessary is just to make it harden by irradiating an ultraviolet-ray to the joint surface which apply | coated the UV adhesive agent, and to fix the objective lens drive unit 7 to the housing | casing of the optical pick-up apparatus 8.

  If it is determined in step S33 that the non-diffracted light is not correctly incident on the first light receiving unit, the process returns to step S31, and based on the x-direction adjustment signal, the optical integrated unit 1, the collimator lens 2, and the like again. The light emitting unit 6 consisting of is moved in the x-axis direction, or the objective lens driving unit 7 is moved in the y-axis direction based on the y-direction adjustment signal. That is, step S31 to step S33 are repeated until it is determined in step 33 that the non-diffracted light is correctly incident on the first light receiving unit.

  According to the manufacturing method, the adjustment direction of the light emitting unit 6 including the optical integrated unit 1 and the collimator lens 2 can be limited to a uniaxial direction. For this reason, it is not necessary to secure a space for adjusting the mounting position of the light emitting unit 6 in the thickness direction (y-axis direction shown in FIG. 15). In other words, the optical pickup device manufactured by the above manufacturing method can be designed without increasing the dimension in the thickness direction, so that the optical pickup device can be reduced in size and weight.

  In each of the above manufacturing methods, the step of adjusting the relative mounting position of the objective lens and the optical integrated unit may include detecting a signal generated in the first light receiving unit by the non-diffracted light in the optical integrated unit. The objective lens is moved in a plane perpendicular to the optical axis of the light beam and / or the optical integrated unit is integrated with the collimator lens so as to be the same as the adjustment error recorded at the time of manufacture. It is preferable that it is a step of moving in a plane perpendicular to the optical axis of the beam and adjusting the relative mounting position of the objective lens and the optical integrated unit.

  That is, whether or not the non-diffracted light made in step S12, step S22, or step S33 is correctly incident on the first light receiving unit is determined by the output signals Sa, Sb, Sc, and , Sd is determined to be the same as the output signals Sa, Sb, Sc, and Sd recorded as adjustment errors when the optical integrated unit 41 mounted on the optical pickup device 8 is manufactured. preferable.

  As described above, when the optical pickup device is used, the relative mounting position of the objective lens and the optical integrated unit is set so as to reproduce the detection signal recorded as the adjustment error in the manufacturing method of the optical integrated unit shown in the first embodiment. By adjusting, more accurate position adjustment becomes possible.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and obtained by appropriately combining technical means disclosed in different embodiments. Such embodiments are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a manufacturing method of an optical integrated unit for realizing miniaturization of an optical pickup used when information is recorded on or reproduced from an optical recording medium such as an optical disk, and a manufacturing method of an optical pickup device including the same. Can be used.

It is a flowchart explaining the process of adjusting the attachment position of the light-receiving means, and the process of adjusting the attachment position of the diffraction means contained in the manufacturing method of the optical integrated unit which concerns on this invention. It is the block diagram which showed the structure of the optical integrated unit manufactured by the manufacturing method of the optical integrated unit which concerns on this invention. It is a block diagram of the manufacturing apparatus for manufacturing the optical integrated unit by applying the manufacturing method of the optical integrated unit which concerns on this invention. It is a block diagram which shows the hologram pattern of the 1st polarization hologram element used for the optical integrated unit shown in FIG. 2 manufactured by the manufacturing method of the optical integrated unit which concerns on this invention. It is a block diagram which shows the hologram pattern of the 2nd polarization hologram element used for the optical integrated unit shown in FIG. 2 manufactured by the manufacturing method of the optical integrated unit which concerns on this invention. FIG. 6A is a diagram for explaining a light receiving portion pattern of a light receiving element used in the optical integrated unit shown in FIG. 2 manufactured by the method for manufacturing an optical integrated unit according to the present invention, and FIG. FIG. 6B is a diagram showing a light beam receiving state when the objective lens is closer to the optical disc than in the case of FIG. 6A. It is a figure explaining the light-receiving part pattern of the light receiving element used for the optical integrated unit shown in FIG. 2 manufactured by the manufacturing method of the optical integrated unit which concerns on this invention, and the light-receiving state of the light beam when spherical aberration generate | occur | produces FIG. It is the block diagram which showed the structure of the other optical integrated unit manufactured by the manufacturing method of the optical integrated unit which concerns on this invention. It is explanatory drawing explaining the change of the light reception state of a diffracted light and a non-diffracted light in the process of adjusting the attachment position of the light-receiving means contained in the manufacturing method of the optical integrated unit which concerns on this invention. It is explanatory drawing explaining the change of the light reception state of a diffracted light and a non-diffracted light in the process of adjusting the attachment position of the diffraction means contained in the manufacturing method of the optical integrated unit which concerns on this invention. It is a flowchart explaining the manufacturing method of the other optical integrated unit which concerns on this invention, Comprising: The process of adjusting the attachment position of a light-receiving means, The process of recording the detection signal detected in a 1st light-receiving part as an adjustment error, It is a flowchart which shows the process of adjusting the attachment position of a diffraction means. It is a flowchart explaining the manufacturing method of the other optical integrated unit which concerns on this invention, Comprising: Before the diffraction means is attached, it is a flowchart explaining the manufacturing method including the process of adjusting the attachment position of a light-receiving means. It is a block diagram which shows the optical integrated unit manufactured by the manufacturing method of the optical integrated unit which concerns on this invention, Comprising: In the process of adjusting the attachment position of a light-receiving means, it is a block diagram which shows the state which removed the diffraction means. FIG. 5 is a configuration diagram showing an optical integrated unit manufactured by the method for manufacturing an optical integrated unit according to the present invention, and shows a state in which a transparent member is attached instead of the diffractive means in the step of adjusting the attachment position of the light receiving means FIG. It is a block diagram which shows the structure of the optical pick-up apparatus manufactured by the manufacturing method of the optical pick-up apparatus based on this invention. It is a flowchart explaining the process of adjusting the relative attachment position of the objective lens and the said optical integrated unit which are included in the manufacturing method of the optical pick-up apparatus which concerns on this invention. It is a flowchart explaining the process of adjusting the relative attachment position of the objective lens and the said optical integrated unit contained in the other manufacturing method of the optical pick-up apparatus which concerns on this invention. It is a flowchart explaining the process of adjusting the relative attachment position of the objective lens and the said optical integrated unit contained in the other manufacturing method of the optical pick-up apparatus which concerns on this invention. It is a block diagram of the optical pick-up apparatus in a prior art. It is a block diagram of the optical integrated unit in a prior art. It is explanatory drawing explaining the hologram pattern of the hologram element with which the optical integrated unit in the prior art was equipped, and the light-receiving part pattern of a light receiving element. It is a block diagram of the other optical integrated unit in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical integrated unit 2 Collimator lens 3 Objective lens 4 Optical disk (optical information recording medium)
5 1/4 wavelength plate 6 Light emitting unit 7 Objective lens drive unit 8 Optical pickup device 9 Optical integrated unit manufacturing device 11 Semiconductor laser (light source)
12 Light receiving element (light receiving means)
12A light receiving part (first light receiving part)
12D to 12F Light receiving part (second light receiving part)
12a to 12d Light receiving cell 14 Polarizing beam splitter (light guiding means)
15 Polarization diffraction element (diffractive means)
18, 19 Package 20, 21 Light beam 22 Non-diffracted light 23 Diffracted light 31 First polarization hologram element 32 Second polarization hologram element 40 0th-order diffracted light (non-diffracted light)
41 + 1st order diffracted light (diffracted light)
42 −1st order diffracted light (non-diffracted light)
51, 52 Holder 53 Transparent substrate

Claims (14)

A light source that emits a light beam;
Diffractive means provided on the optical axis of the return light of the light beam reflected by the optical recording medium, and separating the return light into non-diffracted light and diffracted light;
Production of an optical integrated unit comprising: a first light receiving unit that receives non-diffracted light separated by the diffracting unit; and a light receiving unit that has a second light receiving unit that receives the diffracted light separated by the diffracting unit. A method,
A method of manufacturing an optical integrated unit, comprising: moving the light receiving means based on a detection signal generated in the first light receiving portion by the non-diffracted light, and adjusting a mounting position of the light receiving means. . A light source that emits a light beam;
Diffractive means provided on the optical axis of the return light of the light beam reflected by the optical recording medium, and separating the return light into non-diffracted light and diffracted light;
A light guiding means that transmits the light beam and guides the non-diffracted light and the diffracted light separated by the diffraction means in a direction different from the light source;
An optical integrated unit comprising: a first light receiving unit that receives non-diffracted light guided by the light guiding unit; and a light receiving unit that includes a second light receiving unit that receives diffracted light guided by the light guiding unit. A manufacturing method of
And a step of moving the light receiving means integrally with the light guiding means based on a detection signal generated by the non-diffracted light in the first light receiving portion and adjusting an attachment position of the light receiving means. A method for manufacturing an optical integrated unit. A light source that emits a light beam;
Diffractive means provided on the optical axis of the return light of the light beam reflected by the optical recording medium, and separating the return light into non-diffracted light and diffracted light;
Production of an optical integrated unit comprising: a first light receiving unit that receives non-diffracted light separated by the diffracting unit; and a light receiving unit that has a second light receiving unit that receives the diffracted light separated by the diffracting unit. A method,
Before attaching the diffractive means to the optical integrated unit, based on a detection signal generated in the first light receiving unit by return light that enters the first light receiving unit through the same optical path as the non-diffracted light. And a step of moving the light receiving means and adjusting the mounting position of the light receiving means. A light source that emits a light beam;
Diffractive means provided on the optical axis of the return light of the light beam reflected by the optical recording medium, and separating the return light into non-diffracted light and diffracted light;
Production of an optical integrated unit comprising: a first light receiving unit that receives non-diffracted light separated by the diffracting unit; and a light receiving unit that has a second light receiving unit that receives the diffracted light separated by the diffracting unit. A method,
Before attaching the diffractive means to the optical integrated unit, a transparent member having the same refractive index and the same thickness as the diffractive means is disposed at the same position as the diffractive means, and passes through the transparent member and transmits the non-diffracted light. Including a step of adjusting the mounting position of the light receiving means by moving the light receiving means based on a detection signal generated in the first light receiving part by return light incident on the first light receiving part through the same optical path. A method for manufacturing an optical integrated unit.   5. In the step of adjusting the mounting position of the light receiving means, the light receiving means is moved in a plane perpendicular to the optical axis of non-diffracted light or return light incident on the light receiving means. The manufacturing method of the optical integrated unit as described in any one of these. The first light receiving unit is composed of four light receiving cells divided by two straight lines orthogonal to each other,
6. The detection signal generated in the first light receiving unit is a detection signal including four output signals output from the four light receiving cells. The manufacturing method of the optical integrated unit of description.   7. The optical integration according to claim 6, wherein the step of adjusting the mounting position of the light receiving means includes a step of determining whether the four output signals output from the four light receiving cells are substantially equal. Unit manufacturing method.   8. The method according to claim 1, further comprising a step of recording a detection signal generated in the first light receiving unit as an adjustment error following the step of adjusting the mounting position of the light receiving means. The manufacturing method of the optical integrated unit as described in any one of Claims 1-3.   Based on the detection signal generated by the diffracted light in the second light receiving unit, the diffracting means is translated in a plane perpendicular to the optical axis of the return light incident on the diffracting means, and the diffracting means is The method according to any one of claims 1 to 8, further comprising a step of rotating about an optical axis of return light incident on the diffractive means and adjusting an attachment position and an attachment angle of the diffractive means. Manufacturing method of optical integrated unit.   10. The method of manufacturing an optical integrated unit according to claim 9, wherein the step of adjusting the attachment position of the diffraction means is performed after the step of adjusting the attachment position of the light receiving means. A light source that emits a light beam, a diffractive means that is provided on the optical axis of the return light of the light beam reflected by the optical recording medium and separates the return light into non-diffracted light and diffracted light, and the diffracting means An optical integrated unit comprising: a first light receiving unit that receives the non-diffracted light separated by the light receiving unit; and a light receiving unit that has a second light receiving unit that receives the diffracted light separated by the diffracting unit;
A collimator lens disposed on the optical axis of the light beam for changing the light beam emitted from the optical integrated unit into parallel light;
An objective lens arranged on the optical axis of the light beam for condensing the light beam converted into parallel light by the collimator lens,
Based on the detection signal generated in the first light receiving unit by the non-diffracted light, the objective lens is moved in a plane perpendicular to the optical axis of the light beam and / or the optical integrated unit is An optical pickup device comprising a step of moving in a plane perpendicular to the optical axis of the light beam integrally with a collimator lens and adjusting a relative mounting position of the objective lens and the optical integrated unit Production method.   In the step of adjusting the relative mounting position of the objective lens and the optical integrated unit, the objective lens is moved in a plane perpendicular to the optical axis of the light beam, and the optical integrated unit is moved to the collimator lens. The method of manufacturing an optical pickup device according to claim 11, wherein the directions moving in a plane perpendicular to the optical axis of the light beam are orthogonal to each other.   The step of adjusting the relative mounting position of the objective lens and the integrated optical unit includes an adjustment error in which a detection signal generated in the first light receiving unit by the non-diffracted light is recorded when the integrated optical unit is manufactured. The objective lens is moved in a plane perpendicular to the optical axis of the light beam and / or the optical integrated unit is integrated with the collimator lens and perpendicular to the optical axis of the light beam. The method of manufacturing an optical pickup device according to claim 11, wherein the method is a step of moving in a plane and adjusting a relative mounting position of the objective lens and the optical integrated unit. A light source that emits a light beam;
Diffractive means provided on the optical axis of the return light of the light beam reflected by the optical recording medium, and separating the return light into non-diffracted light and diffracted light;
An optical integrated unit comprising a first light receiving portion that receives non-diffracted light separated by the diffracting means and a second light receiving portion that receives diffracted light separated by the diffracting means is manufactured. A manufacturing device for
An input unit connected to the optical integrated unit and configured to input a detection signal generated in the first light receiving unit;
A calculation unit for calculating an error signal for adjusting the mounting position of the light receiving means from the detection signal;
An optical integrated unit manufacturing apparatus comprising: an output unit that outputs the error signal.

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