WO2006009037A1 - 光ピックアップ装置の組立方法及び光ピックアップ装置 - Google Patents
光ピックアップ装置の組立方法及び光ピックアップ装置 Download PDFInfo
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- WO2006009037A1 WO2006009037A1 PCT/JP2005/012931 JP2005012931W WO2006009037A1 WO 2006009037 A1 WO2006009037 A1 WO 2006009037A1 JP 2005012931 W JP2005012931 W JP 2005012931W WO 2006009037 A1 WO2006009037 A1 WO 2006009037A1
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- Prior art keywords
- information recording
- objective lens
- light source
- recording medium
- optical
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/082—Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Definitions
- the present invention relates to an optical pickup device assembly method and an optical pickup device assembled thereby, and more particularly to an optical pickup device assembly method having a plurality of objective lenses and an optical pickup device assembled thereby.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-298422
- a single objective lens (lens group) emits light beams in three wavelength bands. Designed to form an image on a compatible optical disc with small aberrations (triple compatible method), which is preferable in terms of cost, but has a problem that the design margin for each wavelength is small and the design is generally difficult. .
- the triple compatibility method using a two-lens objective lens according to Japanese Patent Application Laid-Open No. 2001-60336 requires a high accuracy for axial alignment of both objective lenses, or increases the thickness in the optical axis direction. There is a problem. Therefore, achieving triple compatibility with a single (group of) objective lens is a disadvantage in terms of mass productivity and size.
- an objective lens for condensing recording light or reproduction light for high-density DVD and an objective lens for condensing recording light or reproduction light for DVD and CD are provided separately.
- An optical pickup device that realizes triple compatibility by switching the objective lens according to the type of optical disc has also been developed.
- the part where the optical disk is loaded is usually one power location, the force that needs to be used by switching the objective lens used according to the optical disk.
- the coma adjustment for the tilt of the corresponding optical disc must be made for each objective lens.
- a relative tilt changing mechanism that can change the relative tilt of the optical disk and the object lens during recording and Z or playback, even if the objective lens is shifted or tilted during assembly of the optical pickup device.
- the effect can be corrected to some extent.
- the burden of the above-described relative tilt changing mechanism increases as the tilt angle increases, it is preferable to suppress the shift and tilt of the objective lens as much as possible.
- both the two objective lenses with small coma are attached to the actuator via the lens holder, and then the angle of the actuator base with respect to the optical disk is adjusted according to the tilt of the optical disk. It is also possible to suppress the coma aberration of both objective lenses.
- this method has a problem that coma aberration of the objective lens alone has to be small, and it is difficult to produce such an objective lens.
- a method of adjusting the optical axes of the two lenses to be perpendicular to the optical disk is also conceivable.
- the present invention has been made in view of the problems of the prior art, and is a combination of three light beams having different wavelengths and two objective lenses.
- An object of the present invention is to provide an optical pickup device assembling method and an optical pickup device assembled thereby.
- An assembly method of the optical pickup device includes: a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 nm ⁇ ⁇ l ⁇ 450 nm; A second light source that emits light of a second wavelength that satisfies ⁇ ⁇ 2 ⁇ 700 nm, and a third light source that emits light of a third wavelength that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm Supporting a first objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for driving the lens holder, and the actuator And a light source from the first light source through the first objective lens to the information recording surface of the first optical information recording medium through a protective layer having a thickness of tl.
- the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium through the protective layer of thickness t2 (tl ⁇ t2) via the second objective lens.
- t2 thickness of thickness of the second optical information recording medium
- t3 thickness of the third optical information recording medium
- An assembly method of an optical pickup device mounted on an optical information recording / reproducing apparatus comprising a relative tilt changing means capable of changing a relative tilt between the optical information recording medium and the objective lens, wherein the relative tilt is
- the changing means includes a relative inclination between the optical information recording medium and the objective lens.
- the coma aberration in the light beam condensed on the information recording surface of the optical information recording medium can be controlled by changing
- the first objective lens has an image height priority design with respect to the light beam having the first light source power, and the second objective lens is supplied from the second light source and the third light source.
- the image height priority design is made for the luminous flux.
- the coma aberration of the condensing spot is reduced. And adjusting the inclination of the second objective lens with respect to the lens holder.
- Image height priority design refers to a design in which spherical aberration and sine conditions are corrected.
- 1 (a) and 1 (b) are schematic diagrams showing a system that also has a light source LD, an objective lens OBJ, and an optical disk OD force.
- the normal line of the optical disc OD is the same as the relationship between the dotted light source LD and the solid objective lens OBJ in Fig. 1 (a) or the solid light source LD and the dotted objective lens OBJ in Fig. 1 (b). It is preferable that the optical axis of the objective lens OBJ coincides with the light source LD on the straight line L including these (ideal arrangement).
- FIGS. 1 (c) and 1 (e) are diagrams showing the third-order coma aberration characteristics of an objective lens that has been designed for image height priority.
- the tilt priority design refers to a design in which the sine condition is not corrected while the spherical aberration is corrected.
- Fig. 1 (b) coma aberration occurs in the spot B that is imaged on the information recording surface of the optical disc OD when the objective lens OBJ is tilted.
- Fig. 1 (a) when the light source LD is shifted in the direction perpendicular to the optical axis with respect to the straight line L, the optical disc OD is reduced.
- the coma aberration amount with respect to the shift amount is relatively large.
- FIG. 1 (d) is a diagram showing the third-order coma aberration characteristic of the objective lens that has been designed with the tilt angle prioritized.
- the amount of coma generated by the tilt angle of the lens is greatly reduced compared to the design with priority on the image height, while it is highly dependent on the incident angle of the objective lens. It becomes a power to become.
- image height priority design means that an objective lens having a coma aberration of 0.03 ⁇ rms or less is designed with an image height priority design when the angle of incidence on the objective lens is 1 degree.
- Objective lenses are defined as objective lenses designed with priority on tilt.
- image height priority design means that an objective lens having a coma aberration of 0.03 ⁇ rms or less is designed with an image height priority design when the angle of incidence on the objective lens is 1 degree.
- Objective lenses are defined as objective lenses designed with priority on tilt.
- ⁇ is the light source wavelength
- ⁇ is the numerical aperture
- t is the thickness of the protective layer of the optical information recording medium.
- the coma generated when the incident angle to the objective lens is 1 degree.
- Aberration is 0.03 rms or less.
- the coma aberration that occurs when the objective lens tilt occurs once is 0.08.
- the coma generated when the objective lens tilt occurs once is 0.04 rms or less.
- the present invention achieves optimal assembly by utilizing the characteristics of the objective lens formed by these design techniques.
- the light emitted from the objective lens is passed through a glass or resin substrate corresponding to the protective film on the objective lens side of the information recording medium corresponding to each light source.
- the imaging spot can be observed with a magnifying optical system, but this is not a limitation.
- the first objective lens is designed with an image height priority for the light beam having the first light source power.
- the second objective lens is designed to prioritize the image height with respect to the light beams from the second light source and the third light source, so that each objective lens has coma aberration within a predetermined value.
- the frame adjustment sensitivity is low with respect to the inclination of the incident light beam due to the shift of the light source.
- the coma adjustment sensitivity is high with respect to the tilt of the objective lens, it is possible to record information on the optical information recording medium regardless of the light flux of any light source by adjusting the tilt of each objective lens with high accuracy.
- the coma aberration can be suppressed in the spot focused on the surface, and appropriate information can be recorded and Z or reproduced.
- coma aberration caused by warpage of the optical information recording medium, and coma aberration caused by an error remaining due to the limit of parts accuracy and vertical accuracy can be suppressed to a smaller value by using the relative tilt changing means. It can be done.
- the optical axis of the first light source, the second light source, the light beam of the third light source power, and the optical axes of the first objective lens and the second objective lens are relative to the reference optical axis of the optical pickup device. Adjust the tilt of the objective lens by adjusting it so that each tilt is within 1 degree. Or, it is preferable because the shift adjustment process of the light source can be performed accurately in a short time.
- the reference optical axis of the optical pickup device refers to the reference optical axis of the condensing optical system of the optical pickup device.
- the rail for moving the coarse actuator is used as the reference optical axis. It may be used as
- FIG. 11 is a view of an example of the optical pickup device as viewed from above, and is the same as that disclosed in, for example, Japanese Patent Application Laid-Open No. 6-21 5384.
- a seek base SB is arranged at the center of the drive base B on which the spindle motor SM for driving the optical disk OD is mounted, and a moving rail RAIL is arranged on one side of the seek base SB.
- the rail RAIL extends in the pair of coil groups COIL, and the coarse actuator CA is arranged so as to be movable in the radial direction of the optical disc OD as guided by the rails.
- the course actuator CA supports the actuator base ACTB that drives the lens holder HD.
- An assembly method of the optical pickup device includes: a first light source that emits light of a first wavelength ⁇ 1 that satisfies 380 nm ⁇ l ⁇ 450 nm; A second light source that emits light of a second wavelength that satisfies ⁇ ⁇ 2 ⁇ 700 nm, and a third light source that emits light of a third wavelength that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm Supporting a first objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for driving the lens holder, and the actuator And a light source from the first light source through the first objective lens to the information recording surface of the first optical information recording medium through a protective layer having a thickness of tl.
- the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium through the protective layer of thickness t2 (tl ⁇ t2) via the second objective lens.
- a relative inclination changing means capable of changing a relative inclination between the optical information recording medium and the objective lens.
- An assembly method of an optical pickup device mounted on an optical information recording / reproducing device wherein the relative tilt changing means changes the relative tilt between the optical information recording medium and the objective lens,
- the coma aberration in the light beam focused on the information recording surface of the optical information recording medium can be controlled.
- the first objective lens has an image height priority design with respect to the light beam having the first light source power
- the second objective lens has an image height with respect to the light beam from the second light source.
- a priority design has been made, and a tilt priority design has been made for the luminous flux from the third light source.
- the coma aberration of the condensing spot is reduced.
- Adjusting the inclination of the second objective lens with respect to the lens holder; and condensing the light beam from the third light source on the information recording surface of the third optical information recording medium via the second objective lens Performing a shift adjustment process on the third light source so that the coma aberration of the focused spot is reduced.
- the first objective lens is designed to have an image height priority with respect to the light beam having the first light source power
- the second objective lens is Since the image height priority design is applied to the luminous flux having the second light source power, the first objective lens has an inclination of the incident luminous flux due to the shift of the first light source in order to keep the coma aberration within a predetermined value.
- the frame adjustment sensitivity is low.
- the frame adjustment sensitivity is high for the tilt of the objective lens.
- the second objective lens has low coma adjustment sensitivity with respect to the inclination of the incident light beam due to the shift of the second light source in order to keep the coma aberration within a predetermined value.
- the frame adjustment sensitivity is high for the tilt of the objective lens. Therefore, the inclination of the first objective lens when using the light beam from the first light source and the inclination of the second objective lens when using the light beam from the second light source are accurately determined.
- the information recording surface of the optical information recording medium can be used even if the light flux from the misaligned light source is used.
- the coma aberration can be suppressed at the spot focused on, so that appropriate information can be recorded and Z or reproduced.
- the optical axis of the light beam from the third light source and the second objective lens If the position of the third light source is adjusted so as to suppress the shift amount with respect to the optical axis, the light beam from the third light source is condensed on the information recording surface of the third optical information recording medium.
- the coma aberration can be suppressed at the spot. Further, coma aberration caused by warpage of the optical information recording medium, and coma aberration caused by the error remaining due to the limit of parts accuracy and assembly accuracy can be obtained by using the relative inclination changing means. J, can be suppressed.
- An optical pickup apparatus assembling method comprising: a first light source that emits light having a first wavelength ⁇ 1 that satisfies 38 Onm ⁇ ⁇ l ⁇ 450 nm; a second light source that emits light of a second wavelength that satisfies m ⁇ 2 ⁇ 700 nm, and a third light source that emits light of a third wavelength that satisfies 750 nm ⁇ 3 ⁇ 850 nm, and A first objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for driving the lens holder, and the actuator.
- the light beam from the first light source is passed through the first objective lens.
- the light beam from the first light source is passed through the first objective lens.
- By focusing on the surface it is possible to record and Z or reproduce information.
- Information can be recorded and Z or reproduced by focusing on the information recording surface of the information recording medium, and information can be recorded and Z or reproduced on the optical information recording medium.
- an optical pickup apparatus assembly method mounted on an optical information recording / reproducing apparatus includes:
- the changing means includes a relative inclination between the optical information recording medium and the objective lens.
- the coma aberration in the light beam condensed on the information recording surface of the optical information recording medium can be controlled by changing
- the first objective lens is designed to prioritize image height with respect to the light beam having the first light source power, and the second objective lens has priority to tilt with respect to the light beam from the second light source.
- image height priority design has been made for the luminous flux from the third light source,
- the coma aberration of the condensing spot is reduced.
- Adjusting the inclination of the second objective lens with respect to the lens holder; and condensing the light beam from the second light source on the information recording surface of the second optical information recording medium via the second objective lens Performing a shift adjustment process on the second light source so that the coma aberration of the focused spot is reduced.
- the first objective lens is designed to have an image height priority with respect to the light beam having the first light source power
- the second objective lens is Since the image height priority design is made for the light beam with the third light source power, the first objective lens has an inclination of the incident light beam due to the shift of the first light source in order to keep the coma aberration within a predetermined value.
- the frame adjustment sensitivity is low.
- the frame adjustment sensitivity is high for the tilt of the objective lens.
- the second objective lens has low coma adjustment sensitivity with respect to the gradient of the incident light beam due to the shift of the third light source in order to keep the coma aberration within a predetermined value.
- the frame adjustment sensitivity is high for the tilt of the objective lens. Therefore, the inclination of the first objective lens when using the light beam from the first light source and the inclination of the second objective lens when using the light beam from the third light source are accurately determined.
- V coma aberration can be suppressed at the spot focused on the information recording surface of the optical information recording medium even if the light flux from the light source of V or misalignment is used, so that appropriate information recording and Z or Playback can be performed.
- the second objective lens may be the second objective lens.
- the second light source is designed to suppress the shift amount between the optical axis of the light flux from the second light source and the optical axis of the second objective lens.
- coma aberration can be suppressed in the spot condensed on the information recording surface of the second optical information recording medium even if the light beam from the second light source is used.
- coma aberration caused by warpage of the optical information recording medium, and coma aberration caused by the error remaining due to the limit of parts accuracy and assembly accuracy can be obtained by using the relative inclination changing means. J, can be suppressed.
- An optical pickup apparatus assembly method includes a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 nm ⁇ ⁇ l ⁇ 450 nm, and 600 nm ⁇ ⁇ 2
- a second light source that emits light of a second wavelength 2 that satisfies ⁇ 700 nm
- a third light source that emits light of a third wavelength 3 that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm
- the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium through the protective layer having a thickness t2 (tl ⁇ t2) through the objective lens 2 to obtain information.
- Recording, Z or reproduction of the information, and the light from the third light source is recorded on the information recording medium of the third optical information recording medium through a protective layer having a thickness t3 (t2 ⁇ t3).
- An assembly method of an optical pickup device mounted on an optical information recording / reproducing apparatus comprising a relative tilt changing means capable of changing a relative tilt between an optical information recording medium and the objective lens, wherein the relative tilt changing means Changes the relative tilt between the optical information recording medium and the objective lens.
- the first objective lens is not designed to prioritize image height with respect to the luminous flux having the first light source power.
- the second objective lens is designed to give priority to the tilt angle with respect to the light beam from the second light source, and is also designed to give priority to the tilt angle with respect to the light beam from the third light source.
- the first objective lens is designed to prioritize image height with respect to the light beam having the first light source power. Therefore, the first objective lens is In order to keep the coma aberration within the specified value, the coma adjustment sensitivity is low with respect to the inclination of the incident light beam due to the shift of the first light source.
- the first objective lens can be accurately adjusted by adjusting the tilt of the first objective lens when the light beam from the first light source is used. Even if the light beam from the light source is used, it is possible to suppress the frame difference at the spot condensed on the information recording surface of the first optical information recording medium, thereby performing appropriate information recording and Z or reproduction. I can do it.
- the second objective lens is designed with priority on the tilt angle with respect to the light beam from the second light source, and is designed with priority on the tilt angle with respect to the light beam with the third light source power.
- the optical axis of the light beam from the second light source and the optical axis of the second objective lens are suppressed, and the optical axis of the light beam from the third light source and the second objective lens If the positions of the second light source and the third light source are adjusted so as to suppress the shift amount with respect to the optical axis, information on the second optical information recording medium can be obtained even using the light flux from the second light source.
- the coma aberration can also be suppressed in the spot collected on the recording surface, and even if the light flux from the third light source is used, the spot collected on the information recording surface of the third optical information recording medium T Aberration can also be suppressed.
- the shift adjustment processing of the second light source and the shift adjustment processing of the third light source are adjustments that are optically independent from each other, and thus may be performed first.
- An optical pickup device assembly method includes a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 nm ⁇ ⁇ l ⁇ 450 nm, and 600 nm ⁇ ⁇ 2
- a second light source that emits light of a second wavelength 2 that satisfies ⁇ 700 nm
- a third light source that emits light of a third wavelength 3 that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm
- the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium through the protective layer having a thickness t2 (tl ⁇ t2) through the objective lens 2 to obtain information.
- Recording, Z or reproduction of the information, and the light from the third light source is recorded on the information recording medium of the third optical information recording medium through a protective layer having a thickness t3 (t2 ⁇ t3).
- An assembly method of an optical pickup device mounted on an optical information recording / reproducing apparatus comprising a relative tilt changing means capable of changing a relative tilt between an optical information recording medium and the objective lens, wherein the relative tilt changing means Changes the relative tilt between the optical information recording medium and the objective lens.
- the first objective lens is designed to prioritize the tilt angle with respect to the light beam having the first light source power
- the second objective lens is a light beam from the second light source and the third light source.
- Image height priority design has been made, When the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium via the second objective lens, the coma aberration of the condensing spot is reduced. Adjusting the inclination of the actuator base;
- the coma aberration of the condensing spot is reduced. Performing a shift adjustment process on the first light source.
- the second objective lens is designed so that image height is given priority to the light beam having the second light source power, and the second objective lens
- the coma adjustment sensitivity is low with respect to the inclination of the incident light beam due to the shift of the second light source.
- the frame adjustment sensitivity is high with respect to the tilt of the objective lens, the tilt of the second object lens when using the light beam from the second light source can be adjusted accurately. Even when the light beam from the second light source is used, the coma aberration can be suppressed at the spot focused on the information recording surface of the second optical information recording medium, thereby appropriately recording and reproducing Z or reproducing information.
- the first objective lens is designed to give priority to the tilt angle with respect to the light beam having the first light source power, the optical axis of the light beam from the first light source, and the first objective lens If the position of the first light source is adjusted so as to suppress the shift amount with respect to the optical axis, the light beam from the first light source is condensed on the information recording surface of the first optical information recording medium. It is also possible to suppress coma at the spot, thereby enabling appropriate information recording and Z or reproduction. In addition, coma aberration caused by warpage of the optical information recording medium, and coma aberration caused by errors remaining due to limits of parts accuracy and assembly accuracy can be suppressed to a smaller value by using the relative tilt changing means. be able to.
- An optical pickup device assembling method includes: a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 nm ⁇ l ⁇ 450 nm; A second light source that emits light of a second wavelength that satisfies ⁇ ⁇ 2 ⁇ 700 nm, and a third light source that emits light of a third wavelength that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm A first objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for driving the lens holder, and the actuator A light source from the first light source via the first objective lens, and the information on the first optical information recording medium via the protective layer having a thickness of tl. By focusing on the recording surface, information can be recorded and Z or reproduced.
- the light beam from the second light source is condensed on the information recording surface of the second optical information recording medium through the protective layer having a thickness of t2 (tl ⁇ t2) via the second objective lens.
- the information can be recorded and Z or reproduced by the third optical information recording medium through the protective layer having a thickness t3 (t2 ⁇ t3). It is possible to record and / or reproduce information by condensing it on the information recording surface, and when recording and / or reproducing information on the optical information recording medium.
- a method of assembling an optical pickup device mounted on an optical information recording / reproducing apparatus comprising: a relative inclination changing means capable of changing a relative inclination between the optical information recording medium and the objective lens;
- the tilt changing means changes a relative tilt between the optical information recording medium and the objective lens.
- the first objective lens is designed to prioritize the tilt angle with respect to the light beam having the first light source power, and the second objective lens has priority to image height with respect to the light beam from the second light source.
- the tilt priority design has been made for the luminous flux from the third light source.
- the coma aberration of the condensing spot is reduced.
- the second objective lens is Since the image height priority design is made with respect to the light flux of the second light source power, the second objective lens is designed to reduce the incident light flux due to the shift of the second light source in order to keep the coma aberration within a predetermined value.
- the frame adjustment sensitivity is low with respect to the tilt.
- the second objective lens can be accurately adjusted by adjusting the tilt of the second objective lens when using the light flux from the second light source. Even if the luminous flux from the light source of V is used, it is possible to suppress the frame error at the spot focused on the information recording surface of the second optical information recording medium, thereby appropriately recording information and Z Or it can be regenerated. Furthermore, the first objective lens is designed to give priority to the tilt angle with respect to the light beam from the first light source, and the second objective lens has priority to tilt angle with respect to the light beam from the third light source.
- the first light source can be used even if the light flux from the first light source is used.
- the coma aberration can be suppressed at the spot condensed on the information recording surface of the optical information recording medium, and even if the light beam from the third light source is used, the light is condensed on the information recording surface of the third optical information recording medium. It is also possible to suppress coma in the spot.
- coma aberration caused by warpage of the optical information recording medium and coma aberration caused by an error remaining due to the limit of parts accuracy and assembly accuracy can be obtained by using the relative inclination changing means. It can be kept small.
- the shift adjustment process for the first light source and the shift adjustment process for the third light source are adjustments that are optically independent of each other.
- An assembly method of the optical pickup device described in the seventh embodiment of the present invention includes: a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 ⁇ m ⁇ ⁇ l ⁇ 450 nm; and 600 nm ⁇ ⁇ A second light source that emits light of a second wavelength that satisfies 2 ⁇ 700 nm, a third light source that emits light of a third wavelength ⁇ 3 that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm, and 1 objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for driving the lens holder, and supporting the actuator A light source from the first light source through the first objective lens, and the information recording of the first optical information recording medium through the protective layer having a thickness of tl.
- a relative inclination changing means capable of changing a relative inclination between the optical information recording medium and the objective lens when information is recorded and Z or reproduced on the optical information recording medium.
- the relative tilt changing means changes the relative tilt between the optical information recording medium and the objective lens, thereby causing coma aberration in a light beam condensed on the information recording surface of the optical information recording medium. Can be controlled,
- the first objective lens is designed to prioritize the tilt angle with respect to the light beam having the first light source power
- the second objective lens is configured to prioritize the tilt angle with respect to the light beam from the second light source.
- the image height priority design has been made for the luminous flux from the third light source.
- the coma aberration of the condensing spot is reduced.
- the second objective lens is designed to prioritize image height with respect to the light beam having the third light source power. Therefore, the second objective lens is In order to keep the coma aberration within the specified value, the input by shifting the third light source The frame adjustment sensitivity is low against the inclination of the incident light beam.
- the third objective lens can be accurately adjusted by adjusting the tilt of the second objective lens when the light beam from the third light source is used. Even if the luminous flux from the light source is used V, it is possible to suppress the frame coverage at the spot focused on the information recording surface of the third optical information recording medium, thereby appropriately recording information and Z Or it can be regenerated. Further, the first objective lens is designed so that the tilt angle is prioritized with respect to the light beam from the first light source, and the second objective lens is used for the light beam from the second light source.
- the tilt priority design Since the tilt priority design is made, the amount of shift between the optical axis of the luminous flux from the first light source and the optical axis of the first objective lens is suppressed, and the optical axis of the luminous flux from the second light source If the positions of the first light source and the second light source are adjusted so as to suppress the shift amount with respect to the optical axis of the second objective lens, the light beam from the first light source can be used.
- 1 Optical information It is possible to suppress coma aberration at the spot focused on the information recording surface of the recording medium, and even if the light beam from the second light source is used, the light is collected on the information recording surface of the second optical information recording medium. The coma aberration can be suppressed at the spot.
- the shift may be performed first.
- An optical pickup apparatus assembly method includes: a first light source that emits light having a first wavelength ⁇ 1 that satisfies 380 nm ⁇ ⁇ l ⁇ 450 nm; and 600 nm ⁇ ⁇ 2
- a second light source that emits light of a second wavelength 2 that satisfies ⁇ 700 nm, a third light source that emits light of a third wavelength 3 that satisfies 750 nm ⁇ ⁇ 3 ⁇ 850 nm, and a first light source
- the light beam from the second light source is passed through the objective lens of 2 with thickness t2 (tl ⁇ t2).
- Information can be recorded and Z or reproduced by focusing on the information recording surface of the second optical information recording medium via the protective layer, and the light flux from the third light source can be Information is recorded and / or reproduced by focusing on the information recording surface of the third optical information recording medium through a protective layer having a thickness t3 (t2 ⁇ t3).
- the optical information recording medium includes a relative inclination changing unit capable of changing a relative inclination between the optical information recording medium and the objective lens when information is recorded and Z or reproduced on the optical information recording medium.
- the first objective lens is designed to prioritize the tilt angle with respect to the light beam having the first light source power
- the second objective lens is a light beam from the second light source and the third light source.
- the tilt priority design is made with respect to
- the coma aberration of the condensing spot is reduced.
- the first objective lens is designed to give priority to an inclination angle with respect to the light beam having the first light source power
- the second objective lens is the first objective lens
- the tilt priority design is made with respect to the light source 2 and the light flux of the third light source power, the shift amount between the optical axis of the light flux from the first light source and the optical axis of the first objective lens
- the position of the first light source is adjusted to suppress the second light source, and the amount of shift between the optical axis of the light beam from the second light source and the optical axis of the second objective lens is suppressed.
- the shift adjustment process for the first light source, the shift adjustment process for the second light source, and the shift adjustment process for the third light source are optically independent adjustments. Also good
- An optical pickup apparatus assembly method is the shift adjustment method according to any one of the second to eighth embodiments of the present invention.
- the adjustment processing is performed by moving the light source to be adjusted in a direction orthogonal to the reference optical axis.
- the optical pickup device assembling method according to the tenth embodiment of the present invention is the invention according to any one of the sixth embodiment of the present invention, wherein the first light source and the first light source Since the second light source is housed in the same housing, the number of parts can be reduced and the optical pickup device can be made compact. If two light sources are housed in the same housing in this way, the optical axis of at least one of the light sources may shift with respect to the optical axis of the objective lens. This shift amount is about 150 / zm or less. If so, the tilt of both beams incident on the objective lens will be within about 1 degree. It can be an image spot.
- An optical pickup apparatus assembling method is the invention according to any one of the first to third and fifth to seventh embodiments of the present invention.
- This light source and the third light source are housed in the same casing, so that the number of parts can be reduced and the optical pickup device can be made compact.
- the optical axis of at least one light source may shift with respect to the optical axis of the objective lens. This shift amount is about 150 m or less. If there is, enter the objective lens. Since the inclination of the two luminous fluxes is within about 1 degree, the inclination is large with respect to the optical axis!
- both luminous fluxes should be good imaging spots Can do.
- an objective lens with an image height priority design corresponds to both light beams, it is preferable to adjust the light source so that a light beam having a shorter wavelength is brought closer to the optical axis.
- An assembling method of the optical pickup device is the invention according to any one of the third to eighth embodiments of the present invention.
- the second light source is housed in the same casing, and an optical axis correction element that changes the direction of emission of the light beam from one of the light sources is attached to the casing so that the position can be adjusted. Since the optical axis adjustment process is performed by moving the optical axis correction element in the optical axis direction or by moving the position in a plane perpendicular to the optical axis, the optical axis of at least one light source is the light of the objective lens.
- the optical axis correction element refers to an optical element that selectively changes the optical axis of a light beam transmitted or reflected through the optical axis. 2003—Described in 329969!
- An optical pickup device assembling method is the invention described in any one of the second to fourth and sixth to eighth embodiments of the present invention.
- the light source and the third light source are housed in the same housing, and an optical axis correction element that changes the emission direction of the light beam from one light source is attached to the housing so that the position can be adjusted.
- the shift adjustment process is performed by moving the optical axis correction element in the optical axis direction or by moving the position in a plane perpendicular to the optical axis, so that the optical axis of at least one of the light sources is an objective. Even if it is shifted with respect to the optical axis of the lens, by passing the optical axis correction element, the optical axis of the apparent luminous flux approaches or matches the optical axis of the objective lens. I'll do it for you.
- the optical pickup device assembling method according to the fourteenth embodiment of the present invention is the optical pickup device according to any one of the first to twelfth embodiments of the present invention.
- the apparatus includes a separating unit that separates at least part of a light beam reflected from an information recording surface of at least two of the first to third optical information recording media, and the reflected light. And a light axis correcting element disposed between the separating means and the light detector.
- An optical pickup apparatus assembling method is the optical pickup apparatus according to any one of the first to eighth embodiments of the present invention.
- the apparatus has a diffraction grating element for separating a light beam emitted from a light source into a main beam for recording or reproduction and a sub beam for detecting a tracking error signal, and the sub beam is on the information recording surface of the optical information recording medium.
- the aberration of the imaging spot at is less than 0.07 ⁇ rms.
- the optical pickup device assembling method according to the sixteenth embodiment of the present invention is the invention according to any one of the first to third embodiments of the present invention, wherein the lens holder is Since it has a support part including a part of a spherical surface with the principal point of the first objective lens or the second objective lens as a center, the light source is adjusted as the inclination angle of the objective lens is adjusted. It is possible to suppress the shift of the light flux from the optical axis with respect to the optical axis.
- the assembly method of the optical pickup device is the lens holder according to any one of the first to third embodiments of the present invention.
- the inclination was adjusted while keeping the objective lens to be adjusted in a non-contact state.
- an adhesive is filled in a space between the lens holder and the tilt-adjusted objective lens, and both are fixed.
- the orientation of the lens holder may be affected during the tilt adjustment. Even if the tilt adjustment of the objective lens is performed, if the posture of the lens holder returns to the original actual use state after the adjustment, the tilt of the objective lens will deviate from the adjustment state force. According to the assembling method of claim 15, this problem can be avoided.
- An optical pickup device assembling method is the lens holder according to any one of the first to third, sixteenth and seventeenth embodiments of the present invention.
- a concave portion for avoiding interference with the arm holding the objective lens to be adjusted is formed in the lens holder.
- the optical pickup device assembling method according to the nineteenth embodiment of the present invention is the invention according to any one of the eighteenth embodiments of the present invention, wherein the relative inclination changing means is The lens holder is tilted.
- An optical pickup device assembling method is the above-described relative inclination in the invention according to any one of the first to eighteenth embodiments of the present invention.
- the changing means is characterized in that the entire optical system including the objective lens and the light source is tilted.
- the optical pickup device assembling method described in the twenty-first embodiment of the present invention is the same as that described in any one of the first to eighteenth embodiments of the present invention.
- the optical information recording / reproducing apparatus includes a spindle motor that rotationally drives the optical information recording medium, and the relative tilt changing unit tilts the spindle motor.
- An optical pickup device according to a twenty-second embodiment of the present invention is characterized by being assembled by the optical pickup device assembly method according to any of the twenty-first embodiments of the present invention. To do.
- the objective lens in a narrow sense, is a collection arranged to face the optical information recording medium at the position closest to the optical information recording medium in a state where the optical information recording medium is loaded in the optical pickup device.
- a lens that has a light effect A lens that can be actuated at least in the direction of the optical axis by the sensor.
- the first optical information recording medium refers to, for example, a high-density DVD optical disk such as BD or HD DVD
- the second optical information recording medium refers to a DVD used exclusively for playback.
- an optical pickup capable of recording and / or reproducing or recording information on three types of optical information recording media by combining light beams of three different wavelengths and two objective lenses.
- Equipment can be provided.
- FIG. 1 is a schematic diagram showing a system including a light source LD, an objective lens OBJ, and an optical disk OD, and a diagram for explaining an image height priority design and an inclination priority design.
- FIG. 2 is a schematic cross-sectional view of an optical pickup device that works on the first embodiment.
- FIG. 3 is a cross-sectional view of a lens holder that holds two objective lenses.
- FIG. 4 is a schematic cross-sectional view of an optical pickup device that works according to a second embodiment.
- FIG. 5 is a schematic cross-sectional view of an optical pickup device that works according to a third embodiment.
- FIG. 6 is a schematic cross-sectional view of an optical pickup device that works according to a fourth embodiment.
- FIG. 7 is a schematic cross-sectional view of an optical pickup device that works according to a fifth embodiment.
- FIG. 8 is a cross-sectional view showing two examples for holding a light source and a diffraction element of two lasers and one package.
- FIG. 9 is a sectional view similar to FIG. 3, showing a modification of the lens holder.
- FIG. 10 is a diagram showing a jig for holding an objective lens and another modification of the lens holder.
- FIG. 11 is a diagram showing an example of an optical pickup device in which the upper surface force is also seen.
- FIG. 12 is a perspective view of the tilt changing mechanism 10 that adjusts the tilt of the objective lens together with the optical pickup device.
- FIG. 13 is a perspective view of a tilt changing mechanism 20 that adjusts the tilt of the objective lens together with the lens holder.
- FIG. 14 is a perspective view of an inclination changing mechanism 30 that adjusts the inclination of the objective lens together with the optical pickup device.
- Figure 2 shows the recording of information on all high-density DVDs (also called the first optical disk), conventional DVDs (also called the second optical disk) and CDs (also called the third optical disk).
- 1 is a schematic cross-sectional view of an optical pick-up device that can perform reproduction and is effective in a first embodiment.
- FIG. 3 is a cross-sectional view of a lens holder that holds two objective lenses.
- the lens holder HD forms two openings HDa and HDb whose axes are substantially parallel.
- the flange FL1 of the objective lens OBJ1 is attached so as to contact the counterbore HDc on the upper surface.
- the inner peripheral surface of the upper beveling portion HDd is a spherical surface substantially centered at the position of the principal point M of the objective lens OBJ2.
- the objective lens OBJ2 is attached to the lens holder HD so that the flange FL2 is brought into contact with the inner peripheral surface!
- the lens holder HD is supported at least two-dimensionally by an actuator ACT.
- the actuator ACT has an actuator base ACTB that is attached to a frame (not shown) of the optical pickup device so that its position can be adjusted.
- the objective lenses OBJl and OBJ2 are not limited to the positions shown in FIG. 3, but the objective lens for adjusting the tilt with respect to the lens holder HD is shown in FIG. Can be attached to the right opening HDb.
- the light beam emitted from the first collimator lens CL1 passes through the first diffraction grating G1, which is an optical means for separating the light beam also emitted from the light source power into a main beam for recording and reproduction and a sub beam for detecting a tracking error signal, Furthermore, it passes through the first polarizing beam splitter PBS1 and the expander lens EXP.
- the expander lens EXP has at least one optical element movable in the optical axis direction and has a function of changing (enlarging) the beam diameter of the parallel light beam.
- the expander lens EXP provided here has not only a spherical aberration correction function but also, for example, a high-density DVD with two layers of information recording surfaces, and the optical element is This is also to enable selection of the information recording surface by moving in the optical axis direction.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the first objective lens OBJl, the first 1Z4 wavelength plate QWP1, and the expander lens EXP, and then passes through the first polarizing beam splitter PBS1. Since the light is reflected and incident on the light receiving surface of the first photodetector PD1 via the first sensor lens SL1, a read signal of information recorded on the first optical disk OD1 is obtained using the output signal. It is done.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape of the spot and a change in position on the first photodetector PD1. Based on this detection, an actuator is used to move the first objective lens OBJ1 together with the lens holder HD so that the light beam from the first semiconductor laser LD1 is imaged on the information recording surface of the first optical disk OD1. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and further passes through the second objective lens OBJ2. 2 Since the light passes through the sensor lens SL2 and the second dichroic prism DP2 and enters the light-receiving surface of the second photodetector PD2, the output signal is used to read the information recorded on the second optical disc OD2. Is obtained.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape of the spot and a change in position on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and further passes through the second objective lens OBJ2.
- the light passes through the sensor lens SL2, is reflected by the second dichroic prism DP2, and enters the light receiving surface of the third photodetector PD3, so that information is recorded on the third optical disc OD3 using the output signal. An information read signal is obtained.
- focus detection and track detection are performed by detecting a change in the amount of light due to a change in the shape and position of the spot on the third photodetector PD3. Based on this detection, the actuator is moved so that the second objective lens OBJ2 is moved together with the lens holder HD so that the light beam from the third semiconductor laser LD3 is imaged on the information recording surface of the third optical disk OD3. Drive ACT.
- First objective lens OBJ1 has an image height priority design for the light flux from the first semiconductor laser LD1
- the second objective lens OBJ2 has an image height for the light flux from the second semiconductor laser LD2 and the third semiconductor laser LD3. If a priority design is made! / Speak (corresponds to claim 1):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 is bonded and fixed to the lens holder HD, and the second objective lens OBJ2 is not bonded and fixed to the lens holder HD.
- the first objective lens OBJ1 focuses the light beam from the first semiconductor laser LD1 on the information recording surface of the first optical disk OD1
- the coma aberration of the focused spot is below a predetermined value.
- Adjust the inclination of the actuator base ACTB that is, the first objective lens OBJ1 so that it becomes smaller.
- the second objective lens OBJ2 focuses the light flux from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the frame of the focused spot is obtained. Adjust the inclination of the second objective lens OBJ2 with respect to the lens holder HD so that the aberration becomes smaller than the specified value. Then, the second objective lens OBJ2 is bonded and fixed to the lens holder HD.
- the third semiconductor laser LD3 that was not adjusted is used with the initial adjustment within an angle error of 1 degree with respect to the optical axis.
- the first objective lens OBJ1 is designed to prioritize the image height with respect to the light flux of the first semiconductor laser power, and the second objective lens is adapted to the light flux from the second semiconductor laser.
- the image height priority design is made! /
- the tilt angle priority design is made with respect to the light flux from the third semiconductor laser (corresponding to claim 2):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 is bonded and fixed to the lens holder HD, and the second objective lens OBJ1
- the objective lens OBJ2 is not glued to the lens holder HD.
- the first objective lens OBJ 1 focuses the light beam from the first semiconductor laser LD 1 on the information recording surface of the first optical disk OD 1
- the coma aberration of the focused spot is a predetermined value.
- Adjust the inclination of the actuator base ACTB that is, the objective lens OBJ1 so that it becomes smaller below.
- the second objective lens OBJ2 focuses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the coma aberration of the focused spot is reduced. Adjust the inclination of the second objective lens OBJ2 with respect to the lens holder HD so that it becomes smaller than the specified value. After that, the second objective lens OBJ2 is adhered and fixed to the lens holder HD.
- the second objective lens OBJ2 condenses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk OD3, the coma aberration of the condensing spot is predetermined.
- the position of the third semiconductor laser LD3 is adjusted in the direction perpendicular to the optical axis so that it becomes smaller than the value (also referred to as shift adjustment processing!
- the first objective lens OBJ1 is designed to prioritize the image height for the light flux from the first semiconductor laser LD1
- the second objective lens OBJ2 is designed for the light flux from the second semiconductor laser LD2.
- the image height priority design has been made for the light flux from the third laser diode LD3! / If you speak (corresponds to claim 3):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 is bonded and fixed to the lens holder HD, and the second objective lens OBJ2 is not bonded and fixed to the lens holder HD.
- the first objective lens OBJ 1 focuses the light beam from the first semiconductor laser LD 1 on the information recording surface of the first optical disk OD 1
- the coma aberration of the focused spot is a predetermined value.
- Adjust the tilt of the actuator base ACTB ie, the first objective lens OBJ1 so that it becomes smaller below.
- the second objective lens OBJ2 condenses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk. Adjust the inclination of the second objective lens OBJ2 with respect to the lens holder HD so that it is smaller than this value. Adjust. After that, the second objective lens OBJ2 is adhered and fixed to the lens holder HD.
- the second objective lens OBJ2 condenses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the coma aberration of the condensing spot is predetermined.
- the position of the second semiconductor laser LD2 is adjusted in the direction perpendicular to the optical axis so as to be smaller than the value.
- the first objective lens OBJ1 is designed to prioritize the image height for the light flux from the first semiconductor laser LD1
- the second objective lens OBJ2 is designed for the light flux from the second semiconductor laser LD2.
- Tilt priority design has been made, and tilt priority design has been made for the light flux from the third laser diode LD3! / If you speak (corresponds to claim 4):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 and the second objective lens OBJ2 are bonded and fixed to the lens holder HD.
- the first objective lens OBJ1 condenses the light beam from the first semiconductor laser LD1 on the information recording surface of the first optical disk OD1
- the frame convergence of the condensing spot is reduced to a predetermined value or less.
- adjust the inclination of the actuator base ACTB ie, the first objective lens OBJ1
- the tilt of the first objective lens OBJ1 may be adjusted with respect to the lens holder HD connected by the actuator base ACTB. In this case, the first objective lens OBJ 1 should not be bonded and fixed to the lens holder HD before adjustment!
- the second objective lens OBJ2 focuses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2
- the coma aberration of the focused spot is
- the position of the second semiconductor laser LD2 is adjusted in the direction perpendicular to the optical axis so as to be smaller than a predetermined value.
- the second objective lens OBJ2 condenses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk OD3, the coma aberration of the condensing spot is predetermined.
- the position of the third semiconductor laser LD3 is adjusted in the direction perpendicular to the optical axis so as to be smaller than the value.
- the first objective lens OBJ1 is designed to give priority to the tilt angle with respect to the light beam from the first semiconductor laser LD1, and the second objective lens OBJ2 is connected to the second semiconductor laser LD2 and the third half.
- image height priority design is applied to the light beam from the conductor laser LD3 (corresponding to claim 5).
- the optical axes of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser LD3, and the optical axes of the first objective lens OBJl and the second objective lens OBJ2 Adjust and install the optical pickup device so that it is within 1 degree of inclination with respect to the reference optical axis.
- the first objective lens OBJ1 and the second objective lens OBJ2 are bonded and fixed to the lens holder HD.
- the second objective lens OBJ2 condenses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the frame convergence of the condensing spot is reduced to a predetermined value or less.
- adjust the inclination of the actuator base ACTB ie, the second objective lens OBJ2
- the tilt of the second objective lens OBJ2 may be adjusted with respect to the lens holder HD connected with the actuator base ACTB. In this case, the second objective lens OBJ2 should not be bonded and fixed to the lens holder HD before adjustment!
- the first objective lens OBJ1 focuses the light beam from the first semiconductor laser LD1 on the information recording surface of the first optical disk OD1
- the coma aberration of the focused spot is
- the position of the first semiconductor laser LD1 is adjusted in the direction orthogonal to the optical axis so as to be smaller than a predetermined value.
- the first objective lens OBJ1 is designed to prioritize the tilt angle with respect to the light flux from the first semiconductor laser LD1, and the second objective lens OBJ2 is imaged with respect to the light flux from the second semiconductor laser LD2.
- a high-priority design has been made, and an inclination-priority design has been made for the light flux from the third semiconductor laser LD3! / If you speak (corresponds to claim 6):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 and the second objective lens OBJ2 are bonded and fixed to the lens holder HD.
- the second objective lens OBJ2 focuses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the coma aberration of the focused spot is predetermined.
- the inclination of the actuator base ACTB (that is, the second objective lens OBJ 2) is adjusted so as to be smaller than the value.
- the tilt of the second objective lens OBJ2 may be adjusted with respect to the lens holder HD connected with the actuator base ACTB. In this case, the second objective lens OBJ2 should not be bonded and fixed to the lens holder HD before adjustment.
- the second objective lens OBJ2 focuses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk OD3, the coma aberration of the focused spot is
- the position of the third semiconductor laser LD3 is adjusted in the direction orthogonal to the optical axis so as to be smaller than a predetermined value.
- the coma aberration of the condensing spot is a predetermined value.
- the position of the first semiconductor laser LD1 is adjusted in the direction perpendicular to the optical axis so as to be smaller.
- the first objective lens OBJ1 is designed to give priority to the tilt angle with respect to the light beam from the first semiconductor laser LD1, and the second objective lens OBJ2 is tilted with respect to the light beam from the second semiconductor laser LD2.
- Priority design has been made, and image height priority design has been made for the light flux from the third laser diode LD3! / If you speak (corresponds to claim 7):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the first objective lens OBJ1 and the second objective lens OBJ2 are bonded and fixed to the lens holder HD.
- the second objective lens OBJ2 condenses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk, the coma aberration of the condensing spot becomes smaller than a predetermined value.
- Adjust the tilt of the actuator base ACTB ie, the second objective lens OBJ2.
- the tilt of the second objective lens OBJ2 may be adjusted with respect to the lens holder HD connected by the actuator base ACTB. In this case, needless to say, the second objective lens OBJ2 is not bonded and fixed to the lens holder HD before adjustment.
- the second objective lens OBJ2 condenses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2
- the coma aberration of the condensing spot is reduced.
- the position of the second semiconductor laser LD2 is adjusted in the direction perpendicular to the optical axis so as to be smaller than a predetermined value.
- the first objective lens OBJ1 condenses the light beam from the first semiconductor laser LD1 on the information recording surface of the first optical disk OD1
- the coma aberration of the condensing spot is predetermined.
- the position of the first semiconductor laser LD1 is adjusted in the direction perpendicular to the optical axis so as to be smaller than the value.
- the first objective lens OBJ1 is designed to prioritize the tilt angle with respect to the light beam from the first semiconductor laser LD1, and the second objective lens OBJ2 consists of the second semiconductor laser LD2 and the third semiconductor laser LD3.
- the tilt priority design is applied to the luminous flux from (corresponding to claim 8):
- the optical axis of the first semiconductor laser LD1, the second semiconductor laser LD2, the third semiconductor laser L D3, the optical axis of the first objective lens OBJl, and the second objective lens OBJ2 Adjust so that it is within 1 degree of inclination relative to the reference optical axis.
- the coma aberration of the condensing spot is predetermined.
- the position of the first semiconductor laser LD1 is adjusted in the direction perpendicular to the optical axis so as to be smaller than the value.
- the second objective lens OBJ2 condenses the light beam from the second semiconductor laser LD2 on the information recording surface of the second optical disk OD2, the coma aberration of the condensing spot is reduced.
- the position of the second semiconductor laser LD2 is adjusted in the direction perpendicular to the optical axis so as to be smaller than a predetermined value.
- the second objective lens OBJ2 condenses the light beam from the third semiconductor laser LD3 on the information recording surface of the third optical disk OD3, the coma aberration of the condensing spot is predetermined.
- the position of the third semiconductor laser LD3 is adjusted in the direction perpendicular to the optical axis so as to be smaller than the value.
- the coma aberration of the spot light can be suppressed as much as possible when the light beams irradiated with the respective semiconductor laser forces are collected.
- the relative tilt changing means By driving the relative tilt changing means according to the signal of the photodetector force, coma aberration caused by the warp of the optical disk and coma aberration caused by the remaining error are corrected.
- the burden on the relative inclination changing means can be reduced, and the inclination changing mechanism can be reduced in size, energy saving, and low cost.
- FIG. 12 is a side view of the tilt changing mechanism 10 that adjusts the tilts of the objective lenses OBJl and OBJ2 together with the optical pickup device.
- the optical disk is mounted on the turntable TT by a magnet clamp (not shown), and is driven to rotate by a spindle motor SM attached to the fixed base FB.
- a tilt changing motor TVM with a cam CM attached thereto is fixed to the fixed base FB, and is driven to rotate by a driving power source (not shown).
- the optical pickup PU is held by a guide shaft GS fixed to the tilt base TB, and is not shown in the figure.
- the optical pickup PU can be moved in the radial direction of the optical disc by a moving mechanism.
- the tilt base TB is rotatably held on the fixed base FB via the rotary shaft RS and is pressed against the cam CM by the panel SP.
- the tilt sensor TS detects the tilt of the optical disc, and the tilt change motor TVM rotates the cam CM according to the result, thereby tilting the tilt base TB. Change the relative tilt with the objective lens. Thereby, the coma aberration of the light beam condensed on the information recording surface of the optical disk can be controlled.
- This method changes the relative tilt between the optical disc and the entire optical pickup device, and is therefore effective regardless of the image height priority design and tilt angle priority design of the objective lens of the present invention.
- Such a tilt changing mechanism for tilting the optical pickup device is not limited to this method, and various other methods have been proposed.
- Japanese Patent Laid-Open No. 9-91731 has a detailed disclosure.
- FIG. 13 is a perspective view of the tilt changing mechanism 20 that tilts the objective lens together with the lens holder.
- the objective lenses OBJ1 and OBJ2 are bonded and fixed to the lens holder HD.
- the lens holder HD is held on the actuator base ACTB by the suspension wire SW via the wire holder WH holding the damping material and the wire fixing substrate WF.
- the lens holder HD is fixed with a focusing coil FC and tracking coil TC.
- the actuator base ACTB which also functions as a yoke, and the final base It forms a magnetic circuit with the magnet MG fixed to the ACTB. Not shown in the focusing coil FC and tracking coil TC! By passing a drive current from the drive power supply, the lens holder HD can be translated in the focusing and tracking directions.
- two tilt-changing magnets TMG are fixed to the lens holder HD, and two tilt-changing coils TVC are mounted on the magnetic body MB so as to face each other, and the actuator base ACTB.
- the lens holder HD can be tilted by controlling the direction of the current flowing through the respective tilt changing coils TVC so that the two magnetic circuits generate driving forces in opposite directions. Thereby, the coma aberration of the light beam condensed on the information recording surface of the optical disc can be controlled.
- FIG. 14 is a perspective view of the tilt changing mechanism 30 that tilts the objective lens together with the optical pickup device.
- the optical disk is mounted on the turntable TT by a magnet clamp (not shown) and is driven to rotate by the spindle motor SM fixed to the spindle motor holder SMH.
- the optical pickup device PU is held by a guide shaft GS fixed to a fixed base FB, and can be moved in the radial direction of the optical disk by a moving mechanism not shown.
- the fixed base FB is fixed with a tilt changing motor TVM with a cam CM attached, and is driven to rotate by a driving power source (not shown).
- the spindle motor holder SMH is rotatably held on the fixed base FB via the rotary shaft RS, and is pressed against the cam CM by the panel SP.
- the tilt of the optical disk is detected by the tilt sensor TS, and the optical disk is tilted by tilting the spindle motor holder SMH by rotating the cam CM and tilting the spindle motor holder SMH according to the result.
- the relative tilt between the optical disk and the optical pickup device PU ie, the objective lens
- the coma aberration of the light beam condensed on the information recording surface of the optical disk can be controlled.
- This method changes the relative tilt between the optical disc and the entire optical pickup device, and is therefore effective regardless of the image height priority design and tilt angle priority design of the objective lens of the present invention.
- Such an inclination changing mechanism for inclining the spindle motor is not limited to this method, but is disclosed in detail in, for example, Japanese Patent Laid-Open No. 9-282692.
- the objective lens is provided exclusively for the first semiconductor laser and for the shared use of the second semiconductor laser and the third semiconductor laser, the optical disk corresponding to each wavelength is provided.
- the optical design margin of the imaging performance with respect to is generated. This is particularly effective in designing a thin optical pick-up device because the lens thickness and working distance (working distance) can be reduced.
- the aberration margin inherent in the objective lens is increased, aberrations of other optical components of the optical pickup device can be reduced.
- FIG. 5 is a schematic cross-sectional view of an optical pickup device capable of performing recording Z reproduction according to the second embodiment.
- the first semiconductor laser LD1 and the second semiconductor laser LD2 are housed in the same casing to form a so-called two-laser one-package 2L1P!
- the support mode of the two objective lenses with respect to the lens holder HD is the same as that of the above-described embodiment (see Fig. 3).
- the lens holder HD is movably supported at least two-dimensionally by an actuator ACT.
- the actuator ACT has an actuator base ACTB that is attached to an optical pick-up device frame (not shown) so that its position can be adjusted.
- the lens holder HD that supports the objective lens can be rotated around an axis extending approximately parallel to the optical axis of the two objective lenses that support the objective lens. As shown in FIG.
- the first objective lens OBJ1 when recording and Z or reproducing information, the first objective lens OBJ1 is rotated to the position where the light flux that has passed through the 1Z4 wave plate QWP is incident, and the second optical disc OD2 or For the third optical disc OD3 When information is recorded and Z or reproduced, the second objective lens OBJ2 is rotated to the position where the light beam that has passed through the 1Z4 wave plate QWP is incident.
- the light beam emitted from the first collimating lens CL 1 passes through a diffraction grating G, which is an optical means for separating the light beam emitted from the light source into a main beam for recording / reproducing and a sub beam for detecting a tracking error signal, and is further polarized. It passes through the beam splitter PBS and the expander lens EXP.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the first objective lens OBJl, 1Z4 wavelength plate QWP, dichroic prism DP, and expander lens E XP, and then is polarized beam splitter PBS. And is incident on the light receiving surface of the photodetector PD via the sensor lens SL, and a read signal of information recorded on the first optical disc OD1 is obtained using the output signal.
- focus detection and track detection are performed by detecting changes in the shape of the spot on the photodetector PD and changes in the amount of light due to position changes. Based on this detection, the actuator ACT is moved so that the first objective lens OBJ1 is moved together with the lens holder HD so that the light beam from the first semiconductor laser LD1 is imaged on the information recording surface of the first optical disk OD1. Drive.
- the lens holder HD When recording and Z or reproducing information on the second optical disc OD2, the lens holder HD is rotated from the position shown in FIG.
- the light beam emitted from the first collimating lens CL1 is emitted from the light source.
- a diffraction grating G which is an optical means for separating the emitted light beam into a main beam for recording / reproducing and a sub beam for detecting a tracking error signal, and further passes through a polarizing beam splitter PBS and an expander lens EXP.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2, 1Z4 wavelength plate QWP, dichroic prism DP, and expander lens E XP, and then is polarized beam splitter PBS. And is incident on the light receiving surface of the photodetector PD via the sensor lens SL, and a read signal of information recorded on the second optical disc OD2 is obtained using the output signal.
- focus detection and track detection are performed by detecting changes in the shape of the spot on the photodetector PD and changes in the amount of light due to position changes. Based on this detection, the actuator ACT is moved so that the second objective lens OBJ2 is moved together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive.
- the third semiconductor laser LD3 is a hologram laser, and a laser chip LC as a light source and a photodetector PD3 are packaged. The case where information is recorded and Z or reproduced on the third optical disk OD3 will be described.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2, 1Z4 wave plate QWP, is reflected by the dichroic prism DP, and is further reflected by the second collimating lens CL2. And is incident on the light receiving surface of the photodetector PD3 in the third semiconductor laser LD3, and a read signal of information recorded on the third optical disk OD3 is obtained using the output signal.
- focus detection and track detection are performed by detecting spot shape change and position change on the third photodetector PD3. Based on this detection, the actuator is moved so that the second objective lens OBJ2 is moved together with the lens holder HD so that the light beam from the third semiconductor laser LD3 is imaged on the information recording surface of the third optical disk OD3. Drive ACT.
- the coma aberration of the spot light can be suppressed as much as possible when converging.
- the relative tilt changing means By driving the relative tilt changing means according to the signal of the photodetector force, coma aberration caused by the warp of the optical disk and coma aberration caused by the remaining error are corrected.
- the burden on the relative tilt changing means during actual operation can be reduced, and cost reduction, downsizing, and energy saving can be achieved.
- the two objective lenses are dedicated to the first semiconductor laser and the second semiconductor laser and the third semiconductor laser are shared, the imaging performance for the optical disk corresponding to each wavelength is improved.
- the aberration margin inherent in the objective lens is increased, aberrations of other optical components of the optical pickup device can be reduced.
- FIG. 5 shows information for all high-density DVDs (also referred to as first optical disks), conventional DVDs (also referred to as second optical disks, V) and CDs (also referred to as third optical disks).
- FIG. 5 is a schematic cross-sectional view of an optical pickup device capable of performing recording Z reproduction according to the third embodiment.
- the second semiconductor laser LD2 and the third semiconductor laser LD3 are in the same casing. , Housed in a 2 laser 1 package 2L1P!
- the support mode of the two objective lenses with respect to the lens holder HD is the same as that of the above-described embodiment (see Fig. 3).
- the lens holder HD is supported by an actuator ACT so as to be movable at least two-dimensionally.
- the light flux that has passed through the beam shaper BS is corrected for the shape of the light flux and then enters the first collimating lens CL1.
- the light beam emitted from the first collimating lens CL1 passes through the first diffraction grating G1, which is an optical means for separating the light beam also emitted from the light source power into a main beam for recording and reproduction and a sub beam for detecting a tracking error signal. Further, the light passes through the first polarizing beam splitter PBS1 and the expander lens EXP.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the first objective lens OBJl, the first 1Z4 wavelength plate QWP1, and the expander lens EXP, and then passes through the first polarization beam splitter PBS1. Since the light is reflected and incident on the light receiving surface of the first photodetector PD1 via the first sensor lens SL1, a read signal of information recorded on the first optical disk OD1 is obtained using the output signal. It is done.
- focus detection and track detection are performed by detecting a change in the amount of light due to a change in the shape of the spot and a change in position on the first photodetector PD1. Based on this detection, an actuator is used to move the first objective lens OBJ1 together with the lens holder HD so that the light beam from the first semiconductor laser LD1 is imaged on the information recording surface of the first optical disk OD1. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and further passes through the second objective lens OBJ2. Since the light enters the light receiving surface of the second photodetector PD2 via the two-sensor lens SL2, a read signal of information recorded on the second optical disk OD2 can be obtained using the output signal.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and is 2 Incident on the light receiving surface of the second photodetector PD2 via the sensor lens SL2. Therefore, the read signal of the information recorded on the third optical disk OD3 can be obtained using the output signal.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the adjustment (1) to (3) and (5) to (7) described above may be performed.
- the distance between the light emission sources may be about 100 / zm. Since the tilt of the two beams incident on the objective lens OBJ2 is within about 1 degree, applying the second objective lens OBJ2 with the image height priority design to the beam with a large tilt with respect to the optical axis makes it possible to Both of them can be a good imaging spot.
- the adjustment in (5) adjusts the shorter wavelength beam (the beam from the second semiconductor laser LD2) closer to the optical axis. It is preferable to make it.
- the coma aberration of the spot light can be suppressed as much as possible by condensing the light beams emitted from the respective semiconductor lasers by powerful adjustment, in the present embodiment, during actual information recording or reproduction.
- By driving the relative tilt changing means according to the signal of the photodetector force coma aberration caused by the warp of the optical disk and coma aberration caused by the remaining error are corrected.
- the burden on the relative tilt changing means during actual operation can be reduced, and cost reduction, downsizing, and energy saving can be achieved.
- FIG. 6 shows information for all high-density DVDs (also referred to as first optical disks), conventional DVDs (also referred to as second optical disks, V) and CDs (also referred to as third optical disks).
- FIG. 6 is a schematic cross-sectional view of an optical pickup device capable of performing recording Z reproduction according to the fourth embodiment.
- the second semiconductor laser LD2 and the third semiconductor laser LD3 are housed in the same casing to form a so-called two-laser one-package 2L1P!
- the support mode of the two objective lenses with respect to the lens holder HD is the same as that of the above-described embodiment (see Fig. 3).
- the lens holder HD is movably supported at least two-dimensionally by an actuator ACT.
- the light flux that has passed through the beam shaper BS is corrected for the shape of the light flux and then enters the first collimating lens CL1.
- the light beam emitted from the first collimating lens CL1 passes through the first diffraction grating G1, which is an optical means for separating the light beam also emitted from the light source power into a main beam for recording and reproduction and a sub beam for detecting a tracking error signal. Further, the light passes through the first polarizing beam splitter PBS1 and the expander lens EXP.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the first objective lens OBJl, the first 1Z4 wavelength plate QWP1, and the expander lens EXP, and then passes through the first polarizing beam splitter PBS1.
- the light is reflected and further incident on the light receiving surface of the first photodetector PD1 via the first sensor lens SL1.
- a read signal of information recorded in Dl is obtained.
- the detection of the focus and the track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the first photodetector PD1. Based on this detection, an actuator is used to move the first objective lens OBJ1 together with the lens holder HD so that the light beam from the first semiconductor laser LD1 is imaged on the information recording surface of the first optical disk OD1. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface passes again through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, and then the second polarization beam splitter (also referred to as a separation means). After being reflected by PBS2 and further passing through the second sensor lens SL2, it passes through the optical axis correction element SE and is incident on the light receiving surface of the second photodetector PD2, so that the output signal is used to generate the second optical disk. A read signal of information recorded in OD2 is obtained.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and is 2 After passing through the sensor lens SL2, it passes through the optical axis correction element SE and enters the light receiving surface of the second photodetector PD2, so that the information recorded on the third optical disk OD3 is recorded using the output signal. Is obtained.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the two laser 1 package is used for the second semiconductor laser LD2 and the third semiconductor laser LD3, the light source position cannot be adjusted independently. become.
- the light beam emitted from the 2 laser 1 package 2 L 1 P is incident on the diffraction element DE, where coma aberration correction can be performed.
- the correction amount changes according to the rotation amount of the diffraction element DE. Therefore, when the optical pickup device is assembled, when the shift adjustment of the third semiconductor laser LD3 is performed, the third semiconductor laser LD3 is optically driven during the adjustments (2), (4), (6), and (8) described above. Instead of moving in the direction perpendicular to the axis, the shift adjustment process is performed by appropriately rotating the diffraction element DE.
- the optical axis correction element SE shifts the spot light between the two light beams of the semiconductor lasers LD 2 and LD3 on the light receiving surface of the second photodetector PD2. Adjust its position to correct.
- the tilt-priority design side also needs to consider the image height to some extent.
- the high priority sine condition should be somewhat unsatisfactory. Therefore, if the inclination of the optical axis with respect to the wavelength on the image height priority design side is large, coma aberration occurs.
- the optical axes of the pair of sub beams are unbalanced with respect to the optical axis of the objective lens, so the quality of both sub beam spots may be different. Therefore, by using the diffractive element DE, it is possible to correct the light emission point of the light flux of the second semiconductor laser LD2 and the light flux of the third semiconductor laser LD3 so as to approach each other, so that the above-described problem can be solved. Monkey.
- the coma aberration of the spot light can be suppressed as much as possible when the light beams emitted from the respective semiconductor lasers are collected.
- the actual information is recorded or reproduced.
- coma aberration caused by the warp of the optical disk and coma aberration caused by the remaining error are corrected.
- the burden on the relative tilt changing means during actual operation can be reduced, and cost reduction, downsizing, and energy saving can be achieved.
- the imaging performance for the optical disk corresponding to each wavelength is improved.
- the aberration margin inherent in the objective lens is increased, aberrations of other optical components of the optical pickup device can be reduced.
- FIG. 10 is a schematic cross-sectional view of an optical pickup device that works according to a fifth embodiment.
- the support mode of the two objective lenses with respect to the lens holder HD is the same as in the above-described embodiment (see Fig. 3). As shown in FIG. 7, the lens holder HD is supported at least two-dimensionally by the actuator ACT.
- the light flux that has passed through the beam shaper BS is corrected for the shape of the light flux and then enters the first collimating lens CL1.
- the light beam emitted from the first collimator lens CL1 passes through the first diffraction grating G1, which is an optical means for separating the light beam also emitted from the light source power into a main beam for recording and reproduction and a sub beam for detecting a tracking error signal, Furthermore, it passes through the first polarizing beam splitter PBS1 and the expander lens EXP.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the first objective lens OBJl, the first 1Z4 wavelength plate QWP1, and the expander lens EXP, and then passes through the first polarization beam splitter PBS1. Since the light is reflected and incident on the light receiving surface of the first photodetector PD1 via the first sensor lens SL1, a read signal of information recorded on the first optical disk OD1 is obtained using the output signal. It is done.
- focus detection and track detection are performed by detecting a change in the amount of light due to a change in the shape of the spot and a change in position on the first photodetector PD1. Based on this detection, an actuator is used to move the first objective lens OBJ1 together with the lens holder HD so that the light beam from the first semiconductor laser LD1 is imaged on the information recording surface of the first optical disk OD1. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, and then the second polarization beam splitter (also referred to as a separation means). After being reflected by PBS2 and further passing through the second sensor lens SL2, it passes through the optical axis correction element SE and is incident on the light receiving surface of the second photodetector PD2, so that the output signal is used to generate the second optical disk. A read signal of information recorded in OD2 is obtained.
- the optical axis correction element SE is irradiated from either side by correcting the optical axis shift that occurs when at least one of the second semiconductor laser LD2 and the third semiconductor laser LD3 is shifted.
- the luminous flux also functions to converge at the optimum position on the light receiving surface of the second photodetector PD2.
- detection of focus and track detection are performed by detecting a change in the amount of light due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the light beam modulated and reflected by the information pits on the information recording surface again passes through the second objective lens OBJ2 and the second 1Z4 wavelength plate QWP2, is reflected by the second polarization beam splitter PBS2, and is 2 After passing through the sensor lens SL2, it passes through the optical axis correction element SE and enters the light receiving surface of the second photodetector PD2, so that the information recorded on the third optical disk OD3 is recorded using the output signal. Is obtained.
- focus detection and track detection are performed by detecting a change in the light amount due to a change in the shape and position of the spot on the second photodetector PD2. Based on this detection, an actuator is used to move the second objective lens OBJ2 together with the lens holder HD so that the light beam from the second semiconductor laser LD2 is imaged on the information recording surface of the second optical disk OD2. Drive ACT.
- the coma aberration of the spot light can be suppressed as much as possible when the light beams emitted from the respective semiconductor lasers are collected. In the present embodiment, however, the actual information is recorded or reproduced.
- the relative tilt changing means By driving the relative tilt changing means according to the signal of the photodetector force, coma aberration caused by the warp of the optical disk and coma aberration caused by the remaining error are corrected.
- the burden on the relative tilt changing means during actual operation can be reduced, and cost reduction, downsizing, and energy saving can be achieved.
- FIG. 8 is a cross-sectional view showing two examples of holding the light source and the diffractive element of 2 lasers and 1 package, and is applied to the above-described embodiment using the light source and diffractive element of 2 lasers and 1 package. it can.
- the two lasers 1 package 2L1P is attached to the countersink HFa on the lower surface of the substantially hollow cylindrical holding frame HF, and the diffraction element DE is attached to the countersink HFb on the upper surface thereof.
- the diffraction element DE is preferably fixed with an adhesive after being appropriately rotated in the countersink portion HFb during assembly.
- a two-laser 1 knock 2L1P is attached to the countersink HFa on the lower surface of the substantially hollow cylindrical holding frame HF, and an annular support R
- the diffraction element DE is attached via
- it is preferable that the diffraction element DE is fixed with an adhesive after being appropriately rotated in the countersink portion HFb during assembly.
- FIG. 9 is a cross-sectional view similar to FIG. 3, showing a modification of the lens holder.
- the inner peripheral surface of the top countersink portion HDd and the flange FL2 of the objective lens OBJ2 are not in contact with each other in the view of the opening HDb.
- the two are bonded with adhesive B. More specifically, the tilt adjustment is performed while holding the object lens OBJ2 with a jig (not shown) in a non-contact state with respect to the lens holder HD, and after the adjustment, the flange FL2 of the objective lens OBJ2 and the lens holder are adjusted. Fill the space between HD counterbore HDd with adhesive B. The rest is common and will not be described.
- FIG. 10 is a diagram showing a jig for gripping the objective lens and another modified example of the lens holder.
- FIG. 10 (a) is a top view thereof
- FIG. 10 (b) is a diagram of FIG. ) Is cut along the line B-B and viewed in the direction of the arrow.
- Fig. 10 (c) shows the structure of Fig. 10 (a) along the line C--C and is shown in the direction of the arrow.
- FIG. 10 is a diagram showing a jig for gripping the objective lens and another modified example of the lens holder.
- FIG. 10 (a) is a top view thereof
- FIG. 10 (b) is a diagram of FIG. ) Is cut along the line B-B and viewed in the direction of the arrow.
- Fig. 10 (c) shows the structure of Fig. 10 (a) along the line C--C and is shown in the direction of the arrow.
- a groove (concave portion) HDg connected to the opening HDb is formed on the upper surface of the lens holder HD so as to cross the longitudinal direction thereof.
- the jig J that holds the objective lens OBJ2 also has a pair of opposing arms JA and JB. Each of the arms JA and JB has taper support portions JAa and JBa whose widths become narrower from the tip toward the back. The rest is common and will not be described.
- the flange FL2 of the objective lens OBJ2 is grasped by the taper support portions JAa and JBa.
- the held jig J approaches the opening HDb from above the lens holder HD (above Fig. 10 (b)).
- the groove HDg is provided, interference between the jig J and the lens holder HD is avoided.
- coma adjustment is optimal for each light flux emitted from the first to third semiconductor lasers. Therefore, by operating the tilt changing mechanism, it is possible to suppress coma aberration with high accuracy even when the disc used has a tilt variation during actual operation after adjustment. Also, by optimizing the frame adjustment during adjustment, it is possible to reduce the burden of the frame suppression function on the tilt change mechanism, making it easier to create the tilt change mechanism and its drive circuit, reducing costs and downsizing. Can be achieved.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (1)
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JP2006529090A JP4743118B2 (ja) | 2004-07-21 | 2005-07-13 | 光ピックアップ装置の組立方法及び光ピックアップ装置 |
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JP2004212477 | 2004-07-21 | ||
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US (2) | US7843777B2 (ja) |
JP (1) | JP4743118B2 (ja) |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008065889A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Media Electoronics Co Ltd | 光ピックアップ装置及びその製造方法 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7843777B2 (en) * | 2004-07-21 | 2010-11-30 | Konica Minolta Opto, Inc. | Assembly method of optical pickup and optical pickup apparatus |
JPWO2006118221A1 (ja) * | 2005-04-28 | 2008-12-18 | 松下電器産業株式会社 | 対物レンズの傾き調整方法、光ピックアップの製造方法、対物レンズの傾き調整装置、光ピックアップ部品、光ピックアップ、及び光情報記録再生装置 |
US7352517B2 (en) * | 2005-05-09 | 2008-04-01 | Konica Minolta Opto, Inc. | Optical pickup apparatus |
US7616550B2 (en) * | 2005-06-16 | 2009-11-10 | Sanyo Electric Co., Ltd. | Optical pickup unit |
WO2007105592A1 (ja) * | 2006-03-15 | 2007-09-20 | Konica Minolta Opto, Inc. | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 |
JP2008047258A (ja) * | 2006-08-21 | 2008-02-28 | Funai Electric Co Ltd | 光ピックアップ装置 |
JP2008059661A (ja) * | 2006-08-30 | 2008-03-13 | Funai Electric Co Ltd | 光ピックアップ装置、および光ディスク読み取り装置 |
JP2008071392A (ja) * | 2006-09-13 | 2008-03-27 | Funai Electric Co Ltd | 対物レンズのチルト調整機構 |
JP2008084503A (ja) * | 2006-09-29 | 2008-04-10 | Funai Electric Co Ltd | 対物レンズのチルト調整機構 |
JP2008090944A (ja) * | 2006-10-03 | 2008-04-17 | Funai Electric Co Ltd | 光ピックアップ及び光ピックアップの製造方法 |
JP2008090945A (ja) * | 2006-10-03 | 2008-04-17 | Funai Electric Co Ltd | 光ピックアップ |
JP2008097740A (ja) * | 2006-10-13 | 2008-04-24 | Sanyo Electric Co Ltd | 光ディスク装置 |
JP2008176887A (ja) * | 2007-01-22 | 2008-07-31 | Funai Electric Co Ltd | 対物レンズアクチュエータ及びそれを備えた光ピックアップ装置 |
JP4308274B2 (ja) * | 2007-02-01 | 2009-08-05 | 三洋電機株式会社 | 光ピックアップ装置および光ディスク装置 |
JP4260188B2 (ja) * | 2007-02-01 | 2009-04-30 | 三洋電機株式会社 | 光ピックアップ装置および光ディスク装置 |
TWI358065B (en) * | 2007-02-14 | 2012-02-11 | Asustek Comp Inc | Method for determining type of optical disk |
JPWO2008105281A1 (ja) * | 2007-02-28 | 2010-06-03 | 日本電気株式会社 | 光ヘッド装置及び光学式情報記録再生装置 |
JP5169981B2 (ja) * | 2009-04-27 | 2013-03-27 | ソニー株式会社 | 光ピックアップ、光ディスク装置、光ピックアップ製造方法及び光ピックアップ制御方法 |
JP2011044192A (ja) * | 2009-08-19 | 2011-03-03 | Sanyo Electric Co Ltd | 光ピックアップ装置、及び光ピックアップ装置の製造方法 |
JP2012033213A (ja) * | 2010-07-29 | 2012-02-16 | Hitachi Media Electoronics Co Ltd | 光学的情報記録再生装置 |
JP2012104179A (ja) * | 2010-11-09 | 2012-05-31 | Funai Electric Co Ltd | 光ピックアップ |
JP2013131270A (ja) * | 2011-12-21 | 2013-07-04 | Hitachi Media Electoronics Co Ltd | 光ピックアップ装置及びその製造方法 |
DE102015116187A1 (de) * | 2015-09-24 | 2017-03-30 | Grintech Gmbh | Beleuchtungsanordnung, Strahlkombinationsvorrichtung und Verfahren zur Einkopplung von mindestens drei Eingangslichtstrahlen in einen Lichtleiter |
US10803269B2 (en) * | 2015-10-30 | 2020-10-13 | Symbol Technologies, Llc | Scan module and reader for, and method of, electro-optically reading a target by adjusting reading parameters based on target distance |
CN111787207B (zh) * | 2020-07-17 | 2021-05-11 | 常熟理工学院 | 一种具有两方向自由转动的微型摄像头及摄像方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09288835A (ja) * | 1996-02-23 | 1997-11-04 | Matsushita Electric Ind Co Ltd | 対物レンズ駆動装置 |
JPH1011765A (ja) * | 1996-06-26 | 1998-01-16 | Sharp Corp | 光ディスク装置及びその対物レンズの傾き調整方法 |
JPH1123960A (ja) * | 1997-07-03 | 1999-01-29 | Matsushita Electric Ind Co Ltd | 光ディスク用対物レンズ、光ヘッド装置及び光学情報記録再生装置 |
JPH1164724A (ja) * | 1997-08-21 | 1999-03-05 | Matsushita Electric Ind Co Ltd | 光ディスク用対物レンズ及びそれを用いた光ヘッド装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5553052A (en) * | 1993-03-02 | 1996-09-03 | Asahi Kogaku Kogyo Kabushiki Kaisha | Inclination of an objective lens in an optical information system |
US5757758A (en) * | 1995-12-19 | 1998-05-26 | Konica Corporation | Optical pickup apparatus objective lens and converging optical system for optical pickup and optical disk apparatus |
CN1198830A (zh) * | 1996-06-24 | 1998-11-11 | 索尼株式会社 | 盘片驱动装置 |
US6304526B1 (en) * | 1998-03-12 | 2001-10-16 | Matsushita Electric Industrial Co., Ltd. | Optical head |
KR100370187B1 (ko) * | 1998-08-05 | 2003-03-17 | 삼성전자 주식회사 | 광기록재생장치,이에적합한틸트보정방법,그리고기록제어방법 |
JP3976457B2 (ja) | 1998-10-28 | 2007-09-19 | 松下電器産業株式会社 | 光学ヘッド |
JP2000260049A (ja) * | 1999-03-08 | 2000-09-22 | Asahi Optical Co Ltd | 光ディスク装置の光学系 |
JP3519638B2 (ja) * | 1999-07-07 | 2004-04-19 | 株式会社三協精機製作所 | 光ピックアップ装置 |
JP4610118B2 (ja) | 2001-03-30 | 2011-01-12 | Hoya株式会社 | 光ヘッド用対物レンズ |
KR100438701B1 (ko) * | 2001-09-17 | 2004-07-05 | 삼성전자주식회사 | 호환형 광픽업 및 그 광축을 맞추기 위한 조정방법 |
JP4130938B2 (ja) * | 2001-09-28 | 2008-08-13 | Hoya株式会社 | 光ピックアップ用対物光学系 |
JP4259067B2 (ja) * | 2002-02-22 | 2009-04-30 | コニカミノルタホールディングス株式会社 | 光ピックアップ装置の対物光学素子、光ピックアップ装置及び光情報記録再生装置 |
JP3985562B2 (ja) * | 2002-02-25 | 2007-10-03 | 株式会社日立製作所 | 光ヘッド及び光ディスク装置 |
KR100911141B1 (ko) * | 2002-09-03 | 2009-08-06 | 삼성전자주식회사 | 틸트에 따른 파면수차 보정 기능을 갖는 렌즈 및 광픽업 |
KR100509493B1 (ko) * | 2003-02-26 | 2005-08-22 | 삼성전자주식회사 | 호환형 광픽업 |
JP4345002B2 (ja) * | 2004-04-01 | 2009-10-14 | コニカミノルタオプト株式会社 | 光ピックアップ装置の組立方法及び光ピックアップ装置 |
JP2005310331A (ja) * | 2004-04-26 | 2005-11-04 | Konica Minolta Opto Inc | 光ピックアップ装置の組立方法及び光ピックアップ装置 |
KR100612014B1 (ko) * | 2004-06-29 | 2006-08-11 | 삼성전자주식회사 | 광픽업 및 렌즈 조립 장치 및 방법 |
US7843777B2 (en) * | 2004-07-21 | 2010-11-30 | Konica Minolta Opto, Inc. | Assembly method of optical pickup and optical pickup apparatus |
-
2005
- 2005-07-13 US US11/181,630 patent/US7843777B2/en not_active Expired - Fee Related
- 2005-07-13 WO PCT/JP2005/012931 patent/WO2006009037A1/ja active Application Filing
- 2005-07-13 JP JP2006529090A patent/JP4743118B2/ja not_active Expired - Fee Related
- 2005-07-13 CN CNB2005800240714A patent/CN100463061C/zh not_active Expired - Fee Related
-
2010
- 2010-11-15 US US12/946,541 patent/US8199616B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09288835A (ja) * | 1996-02-23 | 1997-11-04 | Matsushita Electric Ind Co Ltd | 対物レンズ駆動装置 |
JPH1011765A (ja) * | 1996-06-26 | 1998-01-16 | Sharp Corp | 光ディスク装置及びその対物レンズの傾き調整方法 |
JPH1123960A (ja) * | 1997-07-03 | 1999-01-29 | Matsushita Electric Ind Co Ltd | 光ディスク用対物レンズ、光ヘッド装置及び光学情報記録再生装置 |
JPH1164724A (ja) * | 1997-08-21 | 1999-03-05 | Matsushita Electric Ind Co Ltd | 光ディスク用対物レンズ及びそれを用いた光ヘッド装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008065889A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Media Electoronics Co Ltd | 光ピックアップ装置及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US7843777B2 (en) | 2010-11-30 |
JPWO2006009037A1 (ja) | 2008-05-01 |
US20060018214A1 (en) | 2006-01-26 |
CN100463061C (zh) | 2009-02-18 |
JP4743118B2 (ja) | 2011-08-10 |
CN1985318A (zh) | 2007-06-20 |
US20110122746A1 (en) | 2011-05-26 |
US8199616B2 (en) | 2012-06-12 |
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