JP2011248938A - Optical pickup device and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device having a mechanism that allows inspection of a half mirror while suppressing a decrease in mechanical strength of a housing.SOLUTION: An optical pickup device 10 houses various optical elements inside a housing 12 including a resin material formed by injection molding. An exposure part 32 of a half mirror 22 as one of the optical elements is exposed externally from a bottom part 34 of the housing 12. A reflection plane of the exposure part 32 faces outside via a groove part 30 formed by deforming the bottom part 34 of the housing 12 into a groove form from outside. For confirmation of the installation angle of the half mirror 22, the half mirror 22 is irradiated with a beam from an autocollimator via the groove part 30.

Description

  The present invention relates to an optical pickup device and a manufacturing method thereof. In particular, the present invention relates to an optical pickup device in which a plurality of optical elements are built in a housing and a method for manufacturing the same.

  The optical pickup device has a function of irradiating an optical disc with laser light having a predetermined wavelength emitted from a light emitting element, and detecting the laser light reflected by the information recording layer of the optical disc with a light receiving element (Patent Document 1). Thus, an information reading operation or writing operation can be performed on the optical disc. In addition, optical elements such as a light emitting element, a light receiving element, and a half mirror constituting the optical pickup device are incorporated in a housing in which a resin material is integrally molded. By doing so, the optical pickup device is in a state where a large number of optical elements are integrated.

  FIG. 5 is a perspective view partially showing a conventional optical pickup device 100. As shown in this figure, in the optical pickup device 100, an optical element such as a half mirror 104 is fixed to a predetermined location inside the housing 102.

  The manufacturing method of the optical pickup device having such a configuration is as follows. First, optical elements such as a light emitting element, a light receiving element, various lenses, and a mirror are accommodated in a predetermined position of the housing 102. Next, adjustment is performed such that laser light is emitted from the light emitting element and the emitted laser light is irradiated to a predetermined light receiving region of the light receiving element. As this adjustment, there is a method of temporarily fixing the light receiving element to the housing 102 and moving the light receiving element so that laser light emitted from the light emitting element is appropriately irradiated to a predetermined light receiving region of the light receiving element. . Alternatively, there is a method in which an optical path changing element that tilts the optical path is interposed between the light emitting element and the light receiving element, and the position of the optical path changing element is adjusted.

  Further, the position of the half mirror 104 is determined by being housed in a predetermined area of the housing, but whether or not the half mirror 104 is disposed at a predetermined angle at a predetermined position after the above-described assembly work is completed. It is necessary to confirm. Since the half mirror 104 is fixed to the housing 102 via an adhesive means such as an adhesive, an error is included in the angle and position of the half mirror 104, and when this error exceeds a certain value, it is reflected by the half mirror 104. The traveling direction of the laser beam greatly deviates from the optical axis and becomes defective.

  As a method for confirming the mounting angle of the half mirror, there is a method of irradiating the half mirror from the outside and confirming the degree to which the reflected light is separated from the light source. However, using this method, it is not easy to check the angle of the half mirror 104 after the optical element has been assembled into the housing. This is because most optical elements including the half mirror are built in a housing made of a light-shielding resin material, and the optical path from the outside to the half mirror is blocked.

  Therefore, conventionally, the end portion of the side wall portion of the housing 102 is partially cut away to provide a concave portion 106, and a light beam is applied to the half mirror 104 from the outside via the concave portion 106. By doing in this way, even if it is after an assembly, the attachment angle of a half mirror can be test | inspected from the outside.

JP 2005-216436 A

  However, when the concave portion 106 is formed by cutting out the upper end of the side surface of the housing 102, there is a problem that the strength of the portion where the concave portion 106 is provided becomes weak. Specifically, the rigidity of the housing 102, which is an integrally molded product of resin, is ensured by a side wall provided around the housing 102. Accordingly, when the concave portion 106 is provided by partially lacking the side wall portion that bears rigidity, the rigidity of the portion where the concave portion 106 is provided is locally reduced. When an external force such as a bending stress is applied to the housing 102 under use conditions, the housing 102 may be deformed at a location where the concave portion 106 is provided.

  Further, the concave portion 106 is a starting point, and there is a possibility that a crack is generated in the side wall portion of the housing 102.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an optical pickup provided with a mechanism capable of inspecting a half mirror while suppressing a decrease in mechanical strength of a housing. It is to provide an apparatus and a method for manufacturing the same.

  An optical pickup device of the present invention is an optical pickup device that emits laser light to an optical recording medium and detects the laser light reflected by the optical recording medium, and has a bottom surface portion and a side surface portion, and has an internal predetermined A housing in which an optical element is accommodated at a position; a mirror that is accommodated in the housing and has one end portion exposed to the outside from the bottom surface portion; and the bottom surface portion of the housing from the outer peripheral end portion to the one end of the mirror. And a removal region continuously removed until reaching the portion.

  The method for manufacturing an optical pickup device of the present invention is a method for manufacturing an optical pickup device that emits laser light to an optical recording medium and detects the laser light reflected by the optical recording medium. A housing having an optical element including a mirror and a step of inspecting a position of the mirror inside the housing, wherein the housing includes an end portion of the mirror in the housing. In the step of inspecting and inspecting the outside from the bottom surface portion, the bottom surface portion is continuously removed from the outer peripheral end portion of the housing to the one end portion of the mirror. The one end portion of the mirror is irradiated with a light beam from an autocollimator, and the light beam reflected by the one end portion of the mirror is received by the autocollimator. And by, characterized by inspecting the angle of the mirror.

  According to the present invention, the outer side surface of the bottom portion of the housing is recessed in a groove shape, so that a path through which the light beam irradiated to the main surface of the mirror for inspection passes is secured. By partially denting the bottom of the housing into a groove shape, the mechanical strength of the entire housing is slightly reduced. However, compared with the conventional example in which the side portion of the housing is partially omitted, a decrease in the rigidity of the housing due to securing the light path is suppressed.

  Further, according to the present invention, the entire half side of the mirror is not exposed to the outside from the housing, but the minimum half mirror required for inspection is exposed to the outside, and the other areas are shielded from light. It is covered with a protective part made of the above material. Accordingly, it is possible to prevent a large amount of light from entering the inside of the housing from the opening provided for the mirror inspection.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the optical pick-up apparatus of this invention, (A) is a perspective view, (B) is a perspective view which expands and shows the principal part, (C) is expanded sectional drawing. (A) is a perspective view partially showing an optical pickup device of the present invention, (B) is a sectional view thereof, and (C) is a partial sectional view of an optical pickup device of a comparative example. It is a figure which shows the optical element incorporated in the optical pick-up apparatus of this invention. It is a figure which shows the inspection process included in the manufacturing process of the optical pick-up apparatus of this invention, (A) is a figure which shows an autocollimator, (B) is a figure which shows the optical pick-up apparatus in an inspection process. It is a perspective view which shows the optical pick-up apparatus of background art.

<First Embodiment: Configuration of Optical Pickup Device>
With reference to FIGS. 1 to 3, the configuration of the optical pickup device of this embodiment will be described. Among these, in particular, FIG. 3 is a diagram showing an optical element built in the optical pickup device 10.

  In the following description, an element provided in the housing of the optical pickup device 10 is referred to as an optical element. Of these optical elements, those through which current passes, such as light emitting elements and light receiving elements, are referred to as optical electronic parts, and optical elements through which no current passes, such as half mirrors and objective lenses, are sometimes referred to as optical parts. . For example, referring to FIG. 3, the PDICs 50 and 74 and the laser devices 58 and 78 are optical electronic components, and the AS plate 73, the half mirrors 22 and 70, the diffraction grating 56, the collimating lenses 60 and 72, and the startup. The mirrors 62 and 33 and the objective lenses 52 and 66 are optical components.

  First, the optical pickup device 10 will be described with reference to FIG. 1A is a perspective view of the optical pickup device 10 as viewed from above, and FIG. 1B is an enlarged view of a portion where a groove 30 (removal region) for inspecting the half mirror 22 is provided. 1 is a perspective view, and FIG. 1C is an enlarged side view showing a portion where the half mirror 22 is provided.

  The optical pickup device 10 focuses a laser beam of BD (Blu-ray Disc), DVD (Digital Versatile Disk) or CD (Compact Disk) standard on an information recording layer of an optical disc (information recording medium), and records the information. It has a function of receiving reflected light from the layer and converting it into an electrical signal. The optical pickup device 10 includes, for example, a light emitting chip for BD, a light emitting chip for DVD and a CD. Here, the optical pickup device 10 does not necessarily correspond to laser light of three types of standards, and may be a type corresponding to laser light corresponding to one or two standards.

  A specific configuration of the optical pickup device 10 includes a housing 12 made of a resin material and various optical elements built in the housing 12. Although not shown here, the upper surface (bottom surface portion 34) of the housing 12 is provided with an actuator for movably holding the objective lens and a wiring electrically connected to the optical electronic component. And a connector functioning as an input / output terminal. Details of the optical element built in the housing 12 will be described later with reference to FIG.

  The housing 12 is made of a resin material integrally formed by injection molding, and includes a bottom surface portion 34 and a side surface portion 36 erected in the thickness direction from the bottom surface portion. Here, the side surface portion 36 of the housing 12 includes a first side surface portion that protrudes in the thickness direction from the outer peripheral end portion of the bottom surface portion 34, and a second side surface portion that protrudes in the thickness direction from the inner region of the bottom surface portion 34. Yes.

  As a resin material constituting the housing 12, polycarbonate, modified PPE, ABS resin or the like is employed. The schematic structure of the housing is the same as that of the conventional type shown in FIG. 5, and a concave storage area for storing a large number of optical elements is provided so as to be recessed from below the housing 12.

  Guide holes 14 and guide grooves 16 are provided at both ends of the housing 12. Under use conditions, a guide shaft is inserted into the guide hole 14, and another guide shaft is engaged with the guide groove 16. The optical pickup device 10 moves along these guide shafts.

  Openings 24 and 26 are formed by partially opening the bottom surface 34 of the housing 12. The openings 24 and 26 are portions that allow the internal space of the housing 12 to communicate with the outside. The light emitted from the light emitting element built in the housing 12 through the openings 24 and 26 is irradiated to the information recording layer of the optical disc located outside through the optical component. Further, laser light, which is return light reflected by the information recording layer of the optical disc, is applied to the light receiving element (PDIC) built in the housing 12 via the openings 24 and 26.

  In this embodiment, two optical systems (optical paths) for BD, DVD and CD are built in the housing 12, and an objective lens corresponding to each optical system is provided on the upper surface of the housing 12. Accordingly, two openings 24 and 26 are arranged corresponding to the respective optical systems. Details of the optical element built in the housing 12 will be described later with reference to FIG.

  Two fixing plates 18 and 20 are disposed on the side surface portion 36 (first side surface portion) of the housing 12. A PDIC (light receiving element) that receives laser light is fixed to the inner main surface of the fixing plates 18 and 20. Here, the PDIC may be sealed with a transparent resin, or may be a so-called CAN package.

  With reference to FIG. 1B and FIG. 1C, in the optical pickup device 10 of the present embodiment, the half mirror 22 which is one of the optical components is partially exposed to the outside from the bottom surface portion 34 of the housing 12. I am letting.

  Specifically, first, the half mirror 22 is a plate-like optical component that transmits or reflects laser light. The half mirror 22 is fixed inside the housing 12 such that the reflection surface thereof is substantially perpendicular to the bottom surface portion 34 of the housing 12. In general, the angle of the reflection surface of the half mirror 22 is set so as to intersect the optical axis of the laser beam at an angle of 45 degrees in plan view.

  In this embodiment, a part of the end portion of the half mirror 22 is exposed to the outside from the bottom surface portion 34 of the housing 12 as an exposed portion 32. By doing in this way, in the final stage which manufactures an optical pick-up apparatus, light can be irradiated to the half mirror 22 from the outside, and the position can be confirmed easily.

  Furthermore, in this embodiment, the groove portion 30 is provided by recessing the bottom surface portion 34 of the housing 12 into a groove shape from the outside. The groove 30 is formed linearly continuously from the exposed portion 32 of the half mirror 22 to the outer peripheral edge of the housing 12. Furthermore, the direction in which the groove portion 30 extends in a plan view is perpendicular to the reflection surface of the half mirror 22. Here, the cross-sectional shape of the groove portion 30 may be other than a square shape, and may be, for example, a U-shape or a V-shape.

  With reference to FIG. 1C, the upper end side of the half mirror 22 is disposed on the same plane as the main surface of the bottom surface portion 34 of the housing 12. By doing in this way, the area of the exposed part 32 exposed to the groove part 30 becomes large, and a subsequent inspection process becomes easy. Here, the upper end side of the half mirror 22 is not necessarily arranged on the same plane as the main surface of the bottom surface 34 of the housing 12. For example, the upper end side of the half mirror 22 may protrude outward from the outer surface of the bottom surface portion 34, or the upper end side of the half mirror 22 may be disposed on the inner side of the outer surface of the bottom surface portion 34. May be.

  The protection part 28 is a part in which a part of the bottom part 34 protrudes upward. The upper surface of the half mirror 22 other than the portion exposed to the outside as the exposed portion 32 is covered with the inner surface of the protective portion 28. The material of the housing 12 including the protection part 28 is a light shielding resin material. Accordingly, it is possible to prevent light from entering the housing 12 from the outside through the half mirror 22 made of a light-transmitting material such as glass.

  Further, by covering the exposed portion of the half mirror 22 made of a brittle material such as glass with the protective portion 28, even if an external force acts on the optical pickup device 10 in the middle of the manufacturing process or under usage conditions, this external force is applied. The half mirror 22 is prevented from being damaged by the above.

  With reference to FIG. 2, the above-described groove 30 will be further described. 2A is a perspective view of the optical pickup device 10 at a location where the groove 30 is provided, and FIG. 2B is a cross-section of the location where the groove 30 is provided (B line in FIG. 2A). FIG. 2C is a cross-sectional view of a comparative example showing the case where the groove 30 is provided at another location.

  As described above, the groove portion 30 is a concave region in which the bottom surface portion 34 of the housing 12 is recessed in a groove shape. In this embodiment, the groove portion 30 (removal region) through which the light beam for confirming the position of the half mirror 22 passes is provided in the bottom surface portion 34, thereby minimizing the rigidity of the housing 12.

  Specifically, referring to FIGS. 2A and 2B, providing the groove 30 in the housing 12 slightly reduces the bending rigidity of the housing 12 as compared to the case where the groove 30 is not provided. . However, the groove portion 30 is not provided over the entire cross section of the bottom surface portion 34, but is provided partially with respect to the cross section of the bottom surface portion 34. That is, with reference to FIG. 2 (B), even if it is a location in which the groove part 30 is provided, the thick part of the bottom face part 34 remains.

  Therefore, even if the groove portion 30 is provided and the area is reduced, rigidity is ensured in other portions of the bottom surface portion 34 where the groove portion 30 is not formed. Accordingly, the bending rigidity of the portion where the groove portion 30 is provided approximates a value proportional to the cube of the height h1 of the side surface portion 36. From this, the bending rigidity of the part provided with the groove part 30 is approximately equal to the bending rigidity of the other part.

  Here, a structure other than the groove 30 described above may be used as a structure that enables the position of the half mirror 22 to be confirmed. That is, in FIG. 2B, the bottom surface portion 34 of the region where the groove portion 30 is provided may be entirely removed in the thickness direction to provide a slit-shaped removal region.

  With reference to FIG. 2C, a method of providing the opening 31 at the lower end of the side surface portion 36 as in the conventional example is also conceivable. However, with this configuration, the side surface portion 36 that contributes to bending rigidity is lost in the cross section in which the opening 31 is provided. Therefore, the bending rigidity in this cross section becomes a value proportional to the cube of the height h2 of the side surface portion 36 that is shortened by only the opening 31 portion. For this reason, even if the height of the opening 31 is shorter than the height of the side surface 36, the bending rigidity is greatly reduced by providing the opening 31. Further, when a bending stress is applied to the housing 12, the opening 31 shown in FIG. 2C may be a starting point and a crack may occur.

  As described above, the upper surface of the bottom surface portion 34 is optimal as a location where the groove portion 30 is provided.

  With reference to FIG. 3, the optical element accommodated in the housing of the optical pick-up apparatus 10 is demonstrated. First, the optical pickup device 10 includes a first optical system 80 that is an optical path of a laser beam of the BD standard and a second optical system 82 that is an optical path of a laser beam of the DVD standard and the CD standard. Note that the optical pickup device 10 is not necessarily provided with two optical systems, and one optical system may be shared by these three standards.

  First, the BD standard first optical system 80 includes a laser device 58, a diffraction grating 56, a half mirror 22, a collimator lens 60, a rising mirror 62, an objective lens 52, an AS plate 73, and a PDIC 50. Is included.

  The laser device 58 is a package of a light emitting element that emits a laser beam applied to a BD standard disc 64. Here, the laser device 58 may be a so-called CAN type package or a lead frame type package.

  The diffraction grating 56 has a function of separating the laser light emitted from the laser device 58 into 0th-order diffracted light, + 1st-order diffracted light, and −1st-order diffracted light.

  The half mirror 22 reflects the laser light emitted from the laser device 58 and passing through the diffraction grating 56, while transmitting the laser light (returned light) reflected by the disk 64.

  The collimating lens 60 turns the laser light reflected by the half mirror 22 into parallel light. Further, the collimating lens 60 is provided so as to be able to be displaced along the optical axis. By doing so, it is possible to correct the deterioration of the optical characteristics of the objective lens 52 based on the temperature change.

  The raising mirror 62 has a function of reflecting the laser beam that has passed through the collimator lens 60 so that the incident laser beam travels at right angles to the information recording layer of the disk 64.

  The objective lens 52 is disposed immediately above the raising mirror 33 and has a function of focusing the laser beam raised by the raising mirror 33 onto the signal recording layer of the disk 64.

  The AS plate 73 gives aberration for the servo mechanism to the laser light reflected by the disk 64 and passed through each optical element.

  The PDIC 50 is a signal detection photodiode integrated circuit element that functions as a photodetector, receives a BD laser beam, generates a light reception output including an information signal component, and is used for a focus servo and a tracking servo. Servo signal component is generated.

  The read operation and write operation of the first optical system 80 are as follows. First, the laser light emitted from the laser device 58 is separated into 0th-order diffracted light, + 1st-order diffracted light, and −1st-order diffracted light by passing through the diffraction grating 56. This is for obtaining a servo signal for performing focus servo and tracking servo in the PDIC 50.

  Thereafter, the laser light is reflected by the half mirror 22, converted into parallel light by the collimator lens 60, and reflected by the rising mirror 62, thereby proceeding in a direction perpendicular to the disk 64. Then, the signal recording layer of the disk 64 is focused by the refractive action and diffraction action of the objective lens 52.

  The laser light (return light) reflected by the signal recording layer of the disk 64 passes through the objective lens 52, the rising mirror 62, and the collimating lens 60 and reaches the half mirror 22.

  The laser light that has passed through the half mirror 22 is given aberration by the AS plate 73 and reaches the PDIC 50. Further, information is read by the PDIC 50, and focus servo and tracking servo are performed based on the read information.

  Next, the second optical system 82 applied to the DVD standard and CD standard discs will be described. The description of the portion of the second optical system 82 that is common to the first optical system 80 is omitted.

  The second optical system 82 includes a laser device 78, a half mirror 70, a collimating lens 72, a rising mirror 33, an objective lens 66, and a PDIC 74.

  The difference between the second optical system 82 and the first optical system 80 is that the second optical system 82 does not include a diffraction grating and an AS plate. Accordingly, in the first optical system 80, the servo mechanism is driven using the three laser beams diffracted by the diffraction grating 56, while in the second optical system 82, only one main beam emitted from the laser device 78 is used. The servo mechanism is driven. Further, the aberration required for the servo mechanism is given by the AS plate 73 in the first optical system 80, and given by the half mirror 70 arranged to be inclined with respect to the optical path in the second optical system 82. .

  The reading operation and writing operation of the disk 64 in the second optical system 82 are as follows. First, a laser beam of CD standard or DVD standard is emitted from the laser device 78. The laser light emitted from the laser device 78 is reflected by the half mirror 70 and then converted into parallel light by the collimator lens 72. Thereafter, the light is reflected by the rising mirror 33 in a direction perpendicular to the information recording layer of the disk 64, and is focused on the information recording layer of the disk 64 by the objective lens 66.

  Laser light, which is return light reflected by the information recording layer of the disk 64, passes through the objective lens 66, is reflected by the rising mirror 33, passes through the collimator lens 72 and the half mirror 70, and irradiates the light receiving surface of the PDIC 74. Is done. Information is read by the PDIC 74, and focus servo and tracking servo are performed based on the read information.

  Here, the groove 30 which is a characteristic part of the present invention shown in FIG. 2 or the like may be provided in the housing 12 corresponding to only one of the half mirror 22 and the half mirror 70, or both. May be provided.

<Second Embodiment: Manufacturing Method of Optical Pickup Device>
Next, a method for manufacturing the optical pickup device 10 of this embodiment will be described. As shown in FIG. 1, the optical pickup device 10 of the present invention is manufactured by fixing a plurality of optical elements inside a housing 12 integrally molded with a resin material.

  Here, when various optical elements are fixed to the housing using an insulating adhesive, a mounting error of about several tens of μm is generated by this fixing process. If this mounting error is left as it is, the laser beam is not irradiated to a predetermined portion of the PDIC (light receiving element), and the reading operation and writing operation by the optical pickup device become unstable.

  In order to prevent this, the position of the PDIC is generally corrected to a predetermined position after the various optical elements are fixed. Specifically, referring to FIG. 1, after incorporating various optical elements such as a laser device into the housing 12, the fixing plates 18 and 20 having the PDIC fixed to the inner surface are emitted while radiating laser light from the laser device. Move to a predetermined location. Thereafter, the fixing plates 18 and 20 are fixed to the housing 12 via an adhesive. In this way, mounting errors that occur when various optical elements are fixed to the housing 12 are absorbed by the position adjustment of the fixing plates 18 and 20, and are applied to a predetermined region of the PDIC fixed to the fixing plates 18 and 20. Laser light is irradiated.

  Furthermore, after the above steps are completed, the positions of various optical elements fixed to the housing 12 are confirmed. Specifically, referring to FIG. 3, the position and angle of the raising mirrors 33 and 62 and the half mirrors 70 and 22 are inspected. An autocollimator is used for this inspection. An autocollimator is an instrument that measures light straightness, squareness, parallelism, flatness, and the like by applying light to a target surface such as an optical element.

  It is easy to check the position of the raising mirror 33 using an autocollimator. This is because the reflecting surface of the raising mirror 33 faces outward (for example, 45 degrees) at a predetermined angle with respect to the main surface of the disk 64. Therefore, the laser beam reflected by the raising mirror 33 is received by the light receiving unit of the autocollimator, so that the position and angle of the raising mirror 33 can be confirmed. If the error measured by this position check is within a predetermined range, it is determined as a non-defective product, and if this error is outside the predetermined range, it is determined as a defective product and discarded. The same applies to the rising mirror 62.

  On the other hand, since the reflection surface of the half mirror 22 is covered with the side surface portion 36 of the housing 12 as shown in FIG. 1, the position of the reflection surface of the half mirror 22 is confirmed by irradiating laser light. It is not easy to do. For this reason, in this embodiment, the laser beam for confirmation is irradiated from the outside to the reflecting surface of the half mirror 22 through the groove 30 as shown in FIG.

  With reference to FIG. 4, the process of confirming the positional accuracy of the half mirror 22 using the autocollimator 38 will be described. FIG. 4A is a diagram showing this process, and FIG. 4B is an enlarged view showing the optical pickup device 10 at a location where the half mirror 22 is provided.

  Referring to FIG. 4A, the autocollimator 38 includes a pedestal 40 on which a measurement object is placed, and a light emitting / receiving unit 42 supported by the pedestal 40 via an arm. A concave region 44 having a shape conforming to the outer shape of the optical pickup device 10 is provided on the upper surface of the base 40. The light emitting / receiving unit 42 includes a light emitting unit that irradiates the measurement target with the laser light 46 perpendicularly and a light receiving unit that receives the laser light reflected by the measurement target. By measuring the positional deviation between the light emitting unit that emits the laser light and the light receiving unit that receives the reflected laser light, the inclination or the like of the measurement object is calculated.

  A method of measuring the degree of inclination of the half mirror 22 built in the optical pickup device 10 using the autocollimator 38 is as follows.

  First, referring to FIG. 4A, the autocollimator 38 is prepared, and the optical pickup device 10 is placed in the concave region 44 formed on the upper surface of the pedestal 40. The shape of the concave region 44 is such that the reflecting surface of the half mirror 22 is perpendicular to the laser light 46 when the half mirror 22 is fixed to the optical pickup device 10 as designed.

  Next, the laser beam 46 is irradiated from the light emitting unit of the light receiving / emitting unit 42 of the autocollimator 38 toward the optical pickup device 10, and the laser light 46 reflected by the half mirror 22 of the optical pickup device 10 is received by the light receiving / emitting unit 42. Light is received by the light receiving unit. Then, in the light emitting / receiving unit 42, the distance between the light emitting unit that emits the laser light 46 and the light receiving unit that receives the laser light reflected by the half mirror 22 is measured, and from this distance, the half mirror 22 is measured. Is calculated. If the calculated tilt angle of the half mirror 22 is within a predetermined range, it is regarded as a non-defective product, and if the tilt angle is larger than the predetermined angle, it is discarded as a defective product.

  With reference to FIG. 4 (B), this process for confirming the angle at which the half mirror 22 is installed will be described in detail. First, the exposed portion 32, which is the front end portion of the half mirror 22 (the end portion on the near side on the paper surface), is exposed to the outside from the bottom surface portion 34 of the housing 12. Further, the upper surface (reflection surface) of the exposed portion 32 of the half mirror 22 is exposed upward via the groove portion 30.

  The laser light 46 emitted downward from the autocollimator 38 is irradiated on the upper surface of the exposed portion 32 of the half mirror 22 via the groove portion 30. Next, the laser light 46 reflected from the upper surface of the exposed portion 32 reaches the light receiving / emitting portion 42 of the autocollimator 38 via the groove portion 30. Then, as described above, the inclination of the half mirror 22 from the reference surface 48 is calculated from the distance between the light emitting part and the light receiving part of the laser light 46.

  The optical pickup device 10 in which the mounting error of the half mirror 22 is within a predetermined range by the above steps is incorporated into the optical pickup support device and the optical disc device through other test steps and adjustment steps.

  Here, in the above description, the case where the half mirror 22 is exposed to the outside from the housing 12 and measurement is described with reference to FIG. 1, but a mirror other than the half mirror may be employed as the measurement target. .

  Further, the guide shaft is inserted or engaged with the guide hole 14 and the guide groove 16 of the housing 12 shown in FIG. 1A, and both ends of the guide shaft are supported by a frame-shaped chassis, thereby supporting the optical pickup. The device is configured. Further, the optical pickup device is configured by incorporating the optical pickup supporting device having such a configuration in a housing.

DESCRIPTION OF SYMBOLS 10 Optical pick-up apparatus 12 Housing 14 Guide hole 16 Guide groove 18 Fixed plate 20 Fixed plate 22 Half mirror 24 Opening part 26 Opening part 28 Protection part 30 Groove part 32 Exposed part 33 Raising mirror 34 Bottom face part 36 Side part 38 Autocollimator 40 Base 42 Light receiving / emitting part 44 Concave area 46 Laser light 48 Reference surface 50 PDIC
52 Objective lens 56 Diffraction grating 58 Laser device 60 Collimating lens 62 Rising mirror 64 Disc 66 Objective lens 70 Half mirror 72 Collimating lens 73 AS plate 74 PDIC
78 Laser device 80 First optical system 82 Second optical system

Claims (9)

An optical pickup device that radiates laser light to an optical recording medium and detects the laser light reflected by the optical recording medium;
A housing having a bottom surface portion and a side surface portion, in which an optical element is housed in a predetermined position inside,
A mirror that is housed in the housing and has one end exposed to the outside from the bottom surface,
A removal region in which the bottom surface portion of the housing is continuously removed from an outer peripheral end portion to the one end portion of the mirror;
An optical pickup device comprising:   The optical pickup device according to claim 1, wherein the groove portion extends at a right angle in a plan view with respect to the reflection surface of the mirror.   2. The protective device according to claim 1, further comprising a protection portion that protects the bottom surface portion of the housing where the mirror is provided from the outside in a state where the one end portion of the mirror is exposed toward the groove. Item 3. The optical pickup device according to Item 2.   The optical pickup device according to any one of claims 1 to 3, wherein the depth of the groove is shallower than the thickness of the bottom surface.   5. The optical pickup device according to claim 1, wherein a side surface including the one end portion of the mirror is positioned on the same plane as an outer main surface of the bottom surface portion. 6.   The optical pickup device according to claim 1, wherein the mirror is a half mirror.   The removal area is a groove portion in which the bottom surface portion of the housing facing outward is continuously recessed in a groove shape from an outer peripheral end portion to the one end portion of the mirror. The optical pickup device according to claim 1.   The said removal area | region is a slit formed by removing the said bottom face part from an outer peripheral edge part to the said one end part of the said mirror, The said any one of Claim 1-6 characterized by the above-mentioned. Optical pickup device. A method of manufacturing an optical pickup device that emits laser light to an optical recording medium and detects the laser light reflected by the optical recording medium,
Storing an optical element including a mirror in a housing having a bottom surface portion and a side surface portion;
Inspecting the position of the mirror inside the housing, and
In the storing step, one end portion of the mirror is exposed to the outside from the bottom surface portion of the housing,
In the inspecting step, the one end portion of the mirror is passed through a removal region provided by continuously removing the bottom surface portion from the outer peripheral end portion of the housing to the one end portion of the mirror. A method of manufacturing an optical pickup device, comprising: inspecting an angle of the mirror by irradiating a light beam from an autocollimator and receiving the light beam reflected by the one end portion of the mirror by the autocollimator.

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