WO2010018653A1 - 光ヘッド装置及び光ディスク装置 - Google Patents
光ヘッド装置及び光ディスク装置 Download PDFInfo
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- WO2010018653A1 WO2010018653A1 PCT/JP2009/003234 JP2009003234W WO2010018653A1 WO 2010018653 A1 WO2010018653 A1 WO 2010018653A1 JP 2009003234 W JP2009003234 W JP 2009003234W WO 2010018653 A1 WO2010018653 A1 WO 2010018653A1
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- light
- light receiving
- objective lens
- region
- head device
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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
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
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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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
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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
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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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
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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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
- G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
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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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/094—Methods and circuits for servo offset compensation
Definitions
- the present invention relates to an optical head device and an optical disk device on which the optical head device is mounted.
- Patent Document 1 proposes a technique for erasing this offset.
- ⁇ 1st order light of the diffracted light of the polarization hologram is separated, and each of the separated ⁇ 1st order light is detected by a photodetector having a light receiving surface larger than the amount of deviation of the irradiation position.
- a track error signal without an offset is obtained.
- JP-A-8-63778 (paragraph 0017, FIG. 1)
- the present invention has been made to solve the above-described problems of the prior art, and provides an optical head device and an optical disc device capable of removing an offset of a track error signal when shifting an objective lens with a simple configuration.
- the purpose is to provide.
- An optical head device of the present invention includes a laser light source that emits laser light, the laser light that travels toward an optical disc, and an objective lens that collects reflected light diffracted by an information track of the optical disc, A diffractive element that diffracts the reflected light collected by the objective lens, an optical element that gives astigmatism to the reflected light, a photodetector that receives the reflected light, a drive signal received from the outside, An optical head device having an objective lens actuator for shifting the objective lens at least in a radial direction of the optical disc by an amount corresponding to a value of a drive signal, wherein the diffraction element is a beam of zero-order light of the reflected light And the first diffraction region including the entire region irradiated with the beam of the first-order light of the reflected light and the beam of the zero-order light of the reflected light are irradiated.
- a second diffractive region that does not include the first diffractive region, and the photodetector includes the first diffractive region and the second diffractive region.
- a first light receiving unit having a plurality of light receiving surfaces arranged adjacent to each other at least in a direction corresponding to the radial direction for receiving a first light beam that is a zero-order light of the diffracted light generated in the diffraction region;
- a second light receiving unit having a plurality of light receiving surfaces arranged adjacent to each other in a direction corresponding to the radial direction for receiving a second light beam which is a + 1st order light of the diffracted light generated in the second diffraction region.
- a plurality of light receiving surfaces arranged adjacent to each other in a direction corresponding to the radial direction for receiving the third light beam that is the ⁇ 1st order light of the diffracted light generated in the second diffraction region. And at least one of the three light receiving portions. .
- the present invention it is possible to remove the offset at the time of shifting the objective lens of the track error signal only by devising the shapes of the first diffraction region and the second diffraction region of the diffraction element.
- FIG. 1 is a perspective view schematically showing a configuration of an optical head device according to Embodiment 1.
- FIG. It is a top view which shows the polarization hologram of FIG.
- FIG. It is a figure which shows the irradiation area
- (A) And (b) is a figure which shows the irradiation position of the light beam irradiated to the light-receiving surface of the photodetector which moved by the radial shift of the objective lens.
- FIG. 6 is a perspective view schematically showing a configuration of an optical head device according to a second embodiment. It is a top view which shows the polarization hologram of FIG. It is a figure which shows the irradiation area
- FIG. 6 is a perspective view schematically showing a configuration of an optical head device according to a third embodiment. It is a top view which shows the hologram of FIG. It is a figure which shows the irradiation area of the light beam divided into 7 by the light-receiving surface and hologram of the photodetector of FIG.
- (A) And (b) is a figure which shows the irradiation position of the light beam irradiated to the light-receiving surface of the photodetector which moved by the radial shift of the objective lens. It is a top view which shows the other example of the hologram of FIG. It is a perspective view which shows roughly the structure of Embodiment 4 which is another example of the position of the objective lens in Embodiment 1, 2, and 3.
- FIG. 1 is a diagram schematically showing a configuration of an optical disc apparatus according to Embodiment 1 of the present invention.
- the optical disk apparatus includes a turntable (not shown) on which an optical disk 1 is mounted, a spindle motor 2 as a disk drive unit that rotationally drives the turntable during recording or reproduction, and an optical disk 1
- the optical head device 3 for reading or writing data, and the moving means 4 for shifting the optical head device 3 in the radial (radius) direction of the optical disk.
- the optical disc apparatus is a matrix to which an electric signal corresponding to the amount of light received by the light beam detected by each light receiving surface (light receiving element) of a light detector (shown in FIG. 2 described later) of the optical head device 3 is supplied.
- the circuit 5 includes a signal reproduction circuit 6, a servo circuit 7, a spindle control circuit 8, a laser control circuit 9, a thread control circuit 10, and a controller 11.
- the matrix circuit 5 includes a matrix arithmetic circuit, an amplifier circuit, and the like, and a necessary signal, for example, a high frequency signal is reproduced by matrix arithmetic processing of output signals from a plurality of light receiving surfaces of the photodetector of the optical head device 3.
- a signal, a focus error signal for servo control, a track error signal, and the like are generated.
- the reproduction signal output from the matrix circuit 5 is supplied to the signal reproduction circuit 6, and the focus error signal and the track error signal are supplied to the servo circuit 7, respectively.
- the signal reproduction circuit 6 performs binarization processing, reproduction clock generation processing, and the like on the reproduction signal from the matrix circuit 5 to generate reproduction data.
- the data decoded up to the reproduction data is transferred to a host device (not shown) such as a device as an AV system or a personal computer.
- the servo circuit 7 generates various servo drive signals for focus and track from the focus error signal and the track error signal supplied from the matrix circuit 5, and causes the optical head device 3 to perform a servo operation. That is, a focus drive signal and a track drive signal are generated according to the focus error signal and the track error signal, and the focus coil and the track coil of the objective lens actuator of the optical head device 3 are driven. Thus, a focus servo loop and a track servo loop are formed by the optical head device 3, the matrix circuit 5, and the servo circuit 7.
- the spindle control circuit 8 controls the rotation of the spindle motor 2.
- the laser control circuit 9 controls the intensity of the laser light emitted from the optical head device 3.
- the sled control circuit 10 shifts the optical head device 3 in the radial direction of the optical disc 1 by the moving means 4 so that the optical head device 3 can read a desired position in the radial direction of the optical disc 1.
- controller 11 formed by a microcomputer.
- the controller 11 executes various processes in accordance with commands from the host device.
- FIG. 2 is a perspective view schematically showing a configuration of the optical head device 3 according to the first embodiment.
- the optical head device 3 includes a semiconductor laser 101 that is a laser light source that emits laser light, a polarization beam splitter 102, a collimator lens 103, a polarization hologram 104 that is a diffraction element, and 1 / 4 wavelength plate (laminated on the polarizing hologram 104, not shown), condensing the laser light toward the optical disc 1, and collecting the reflected light diffracted by the information track 1a of the optical disc 1.
- An objective lens 105 that emits light
- a movable holding unit 106 that integrally holds the objective lens 105 and the polarizing hologram 104
- an objective lens actuator 107 that drives the movable holding unit 106 in the focus direction or the radial direction of the optical disc 1
- a cylindrical lens 108 which is an optical element giving astigmatism and a photodetector 109 are provided. That.
- the direction of the laser light emitted from the semiconductor laser 101 is changed by the polarization beam splitter 102, passes through the collimator lens 103, the polarization hologram 104, and a 1 ⁇ 4 wavelength plate (not shown), and the optical disk 1 by the objective lens 105. Are collected on the information track 1a.
- the laser light is diffracted by the information track 1a to become reflected light, passes through the objective lens 105 and a quarter-wave plate (not shown), and passes through the polarizing hologram 104 to generate a plurality of light beams (7 in the first embodiment).
- a light beam) passes through the polarization beam splitter 102, is given astigmatism by the cylindrical lens 108, and is irradiated to the photodetector 109.
- FIG. 3 is a plan view showing the polarization hologram 104 of FIG.
- the polarization hologram 104 is a first diffraction that includes the entire region irradiated with both the 0th-order beam of reflected light and the ⁇ 1st-order beam of reflected light diffracted by the information track 1a of the optical disc 1.
- the second diffraction region 111 including the regions 112 and 113 and the region where the 0th-order light beam of the reflected light is irradiated and the ⁇ first-order light beam of the reflected light is not irradiated and does not include the first diffraction regions 112 and 113. And have. As shown in FIG.
- the first diffraction regions 112 and 113 are configured so that the 0th-order light beam of reflected light and the ⁇ 1st-order light beam of reflected light are on the polarizing hologram 104. It has a shape that coincides with the two regions (hatching regions in the vertical direction in FIG. 4) 122 and 123 that are irradiated in an overlapping manner. Further, as shown in FIG. 3, in the first embodiment, the second diffraction region 111 is irradiated with a 0th-order light beam of reflected light on the polarization hologram 104, and a ⁇ 1st-order light beam of reflected light is irradiated.
- the polarization hologram 104 is composed of three diffraction regions 111, 112, and 113, and the polarization hologram 104 is composed of three diffraction regions 111, 112, and 113.
- the diameter of the effective circle 110 is set equal to the effective diameter of the objective lens 105.
- the objective lens 105 and the polarizing hologram 104 are fixed to the movable holding unit 106 so that the optical axis of the objective lens 105 and the center of the effective circle 110 coincide with each other.
- FIG. 4 is a view showing a light receiving surface of the photodetector 109 of FIG. 2 and an irradiation region of the light beam divided into seven by the polarizing hologram 104.
- the light detector 109 detects the 0th-order light of the diffracted light generated in the first diffraction regions 112 and 113 and the second diffraction region 111 of the polarization hologram 104 (that is, the reflected light from the optical disk 1 is converted into the polarization hologram 104.
- the first light receiving portion 131 is composed of a plurality of light receiving surfaces arranged adjacent to each other at least in the direction corresponding to the radial direction for receiving the first light beam 141 which is the 0th-order light generated by diffracting (transmitting) the light.
- the light detector 109 is adjacent to a direction corresponding to the radial direction for receiving the second light beam 142 that is the + 1st order light of the diffracted light generated in the second diffraction region 111 of the polarization hologram 104.
- the light receiving surface of the light detector 109 is an eight-divided light detector for detecting a track error signal of a general differential method as a track error signal generation method of an optical disk device.
- the light detector 109 includes four light receiving surfaces A, B, C, and D constituting the first light receiving portion 131, two light receiving surfaces E and F constituting the second light receiving portion 132, and a third light receiving portion.
- a total of eight light-receiving surfaces including two light-receiving surfaces G and H constituting the portion 133 are provided.
- the four light receiving surfaces A, B, C, and D of the first light receiving unit 131 correspond to a direction corresponding to the radial direction of the optical disc 1 and a tangential direction (tangential direction at the light beam irradiation position of the information track 1a). Are four light receiving surfaces arranged adjacent to each other.
- the two light receiving surfaces E and F of the second light receiving unit 132 are two light receiving surfaces arranged adjacent to each other in a direction corresponding to the radial direction of the optical disc 1.
- the two light receiving surfaces G and H of the third light receiving unit 133 are two light receiving surfaces arranged adjacent to each other in a direction corresponding to the radial direction of the optical disc 1.
- the boundary line between the two light receiving surfaces E and F of the second light receiving unit 132 is a straight line extending in a direction corresponding to the tangential direction, and the boundary between the two light receiving surfaces G and H of the third light receiving unit 133.
- the line is a straight line extending in a direction corresponding to the tangential direction.
- the first light beam 141 which is laser light that is zero-order light generated by the polarizing hologram 104 (passed through the polarizing hologram 104), is a light receiving surface A, B, C, D of the first light receiving unit 131.
- the second light beam 142 which is the + 1st order light of the diffracted light generated by the second diffraction region 111 of the polarization hologram 104 reaches the light receiving surfaces E and F of the second light receiving unit 132, and the polarization hologram 104.
- the third light beam 143 that is the ⁇ 1st order light of the diffracted light generated by the diffraction region 111 reaches the light receiving surfaces G and H of the third light receiving unit 133.
- the ⁇ first-order light diffracted by the first diffraction regions 112 and 113 of the polarization hologram 104 reaches the outside of the light receiving surface of the photodetector 109 as laser light 144, 145, 146, and 147.
- the levels of electric signals photoelectrically converted by the light receiving surfaces A, B, C, D, E, F, G, and H are respectively represented as A, B, C, D, E, F, G, and H. Indicated as H.
- the matrix circuit 5 receives the detection signals A, B, C, D, E, F, G, and H of the light detector 109, and generates a focus error signal FES by the calculation of the following astigmatism method.
- FES (A + C)-(B + D)
- the matrix circuit 5 generates the track error signal TES by the following equation.
- TES (A + B) ⁇ (D + C) ⁇ k ⁇ ⁇ (E ⁇ F) + (GH) ⁇
- k is a constant.
- FIGS. 5A and 5B are diagrams showing the irradiation position of the light beam irradiated on the light receiving surface of the photodetector 109 moved by the radial shift of the objective lens 105.
- FIG. FIG. 5A shows that when the objective lens 105 is shifted in the inner circumferential direction of the optical disc 1, the first to third light beams 141, 142, and 143 are shifted upward in FIG. Show.
- FIG. 5B shows that when the objective lens 105 is shifted in the outer circumferential direction of the optical disc 1, the first to third light beams 141, 142, and 143 are shifted downward in FIG. 5B. ing.
- 6 (a) to 6 (c) are diagrams showing changes in the detection signal of the light receiving surface of the photodetector 109 due to the shift of the objective lens 105 in the radial direction. This is a signal when the focus servo is on and the track servo is off.
- the waveform of the signal (A + B) ⁇ (C + D) is a push-pull waveform with no offset.
- the DC waveform of the signal (EF) + (GH) is also a waveform without an offset.
- the waveform of the signal (A + B) ⁇ (C + D) becomes a push-pull waveform offset to plus.
- the direct current waveform of the signal (EF) + (GH) is also a positively offset waveform. Therefore, the value of the signal (EF) + (GH) represents a value corresponding to the shift amount of the objective lens. From the value of (A + B)-(C + D), (EF) + (G The track error signal TES with the offset canceled is obtained by subtracting a constant multiple (k times) of the value of ⁇ H).
- the waveform of the signal (A + B) ⁇ (C + D) is a push-pull waveform offset to minus.
- the direct current waveform of the signal (EF) + (GH) is also a waveform that is negatively offset. Therefore, the value of the signal (EF) + (GH) represents a value corresponding to the shift amount of the objective lens. From the value of (A + B)-(C + D), (EF) + (G By subtracting a constant multiple of the value of ⁇ H), a track error signal TES with offset canceled is obtained.
- a constant multiple of the value of the signal (EF) + (GH) instead of a constant multiple of the value of the signal (EF) + (GH), a constant multiple of the value of the signal (EF) or a constant multiple of the value of the signal (GH) may be used. Is possible.
- the track error signal TES of the track error signal TES is detected by using a general differential type eight-segment optical detector for track error detection. Offset can be suppressed.
- FIG. FIG. 7 is a perspective view schematically showing a configuration of an optical head device 3a according to Embodiment 2 of the present invention.
- an optical head device 3a includes a semiconductor laser 201, a polarization beam splitter 202, a collimator lens 203, a polarizing hologram 204 which is a diffraction element fixed to the optical head device 3a, a quarter wavelength plate ( (Not shown), an objective lens 205, a movable holding portion 206 that holds the objective lens 205, an objective lens actuator 207 that drives the movable holding portion 206 in the focus direction or the radial direction of the optical disc 1, and provides astigmatism
- a cylindrical lens 208 that is an optical element and a photodetector 209 are provided.
- the semiconductor laser 201, the polarization beam splitter 202, the collimator lens 203, the quarter wavelength plate (not shown), the objective lens 205, the cylindrical lens 208, and the photodetector 209 are the same as the semiconductor laser 101 in the first embodiment, the polarization This is the same as the beam splitter 102, collimator lens 103, quarter-wave plate (not shown), objective lens 105, cylindrical lens 108, and photodetector 109.
- the movable holding unit 206 holds the objective lens 205 and does not hold the polarization hologram 204, and only the shape of the polarization region of the polarization hologram 204 is implemented. This is different from the optical head device 3 according to the first embodiment. Therefore, in the description of the second embodiment, reference is also made to FIG. 1 and FIGS.
- FIG. 8 is a plan view showing the polarization hologram 204 of FIG.
- the polarization hologram 204 is an area irradiated with both the 0th-order light beam of the reflected light diffracted by the information track 1a of the optical disc 1 and the ⁇ 1st-order light beam of the reflected light.
- First diffraction region 213 including the entirety of 222 and 223, and ⁇ first-order light of reflected light irradiated with a 0th-order light beam of reflected light
- the second diffraction regions 211 and 212 that do not include the first diffraction region 213.
- both the 0th-order beam of reflected light and the ⁇ 1st-order beam of reflected light overlap on the polarizing hologram 204.
- Each of the two regions 222 and 223 irradiated in this manner is a region having a shape (rectangle shown as a vertical hatching region in FIG. 8) that is expanded in the radial direction (lateral direction in FIG. 8).
- the second diffraction regions 211 and 212 are irradiated with a zero-order light beam of reflected light on the polarizing hologram 204 and ⁇ 1st-order light of the reflected light.
- the optical disc 1 that is not irradiated with the first diffraction region 213 and is located outside the tangential direction of the optical disc 1 (two regions shown as two hatched regions in FIG. 8). Rectangular area).
- the diffraction region 213 has a shape such that the regions 222 and 223 do not protrude from the diffraction region 213 even when the objective lens 205 is shifted in the radial direction perpendicular to the information track 1a.
- the polarization hologram 204 uses the difference in the polarization direction of the laser light and has a diffractive action only on the return path laser light reflected by the optical disc 1.
- FIG. 9 is a view showing a light receiving surface of the photodetector 209 in FIG. 7 and an irradiation region of the laser beam divided into seven by the polarization hologram 204.
- the light detector 209 is configured to detect the 0th-order light of the diffracted light generated in the first diffraction region 213 and the second diffraction regions 211 and 212 of the polarization hologram 204 (that is, the reflected light from the optical disc 1 is converted into the polarization hologram 204.
- First light receiving portion 231 comprising a plurality of light receiving surfaces arranged adjacent to each other at least in a direction corresponding to the radial direction for receiving the first light beam 241 that is the 0th order light generated by diffracting (transmitting) at Have
- the light detector 209 receives the two second light beams 242 and 243 that are + 1st order light of the diffracted light generated in the second diffraction regions 211 and 212 of the polarization hologram 204 in the radial direction.
- a second light receiving portion 232 composed of a plurality of light receiving surfaces arranged adjacent to each other in the corresponding direction, and a third light beam 244 that is the ⁇ 1st order light of the diffracted light generated by the second diffraction regions 211 and 212.
- a third light receiving unit 233 including a plurality of light receiving surfaces arranged adjacent to each other in a direction corresponding to the radial direction of receiving H.245.
- the light receiving surface of the photodetector 209 is an eight-divided photodetector for differential track error detection, which is a general method for generating a track error signal in an optical disc apparatus.
- the light detector 209 includes four light receiving surfaces A, B, C, and D that constitute the first light receiving unit 231, two light receiving surfaces E and F that constitute the second light receiving unit 232, and a third light receiving unit.
- a total of eight light receiving surfaces including two light receiving surfaces G and H constituting the portion 233 are provided.
- the shape of each light receiving surface is the same as that of the first embodiment.
- the first light beam 241 that is the zero-order light of the diffracted light generated by the polarizing hologram 204 (passed through the polarizing hologram 204) is incident on the light receiving surfaces A, B, C, and D of the first light receiving unit 231. To reach.
- the + 1st order light of the diffracted light generated by the second diffraction regions 211 and 212 of the polarization hologram 204 reaches the light receiving surfaces E and F of the second light receiving unit 232 as second light beams 242 and 243
- the ⁇ 1st order light of the diffracted light generated by the diffraction regions 211 and 212 of the polarization hologram 204 reaches the light receiving surfaces G and H of the third light receiving unit 233 as third light beams 244 and 245.
- the ⁇ first-order light diffracted by the first diffraction region 213 of the polarization hologram 204 reaches the outside of the light receiving surface of the photodetector 209 as light beams 246 and 247.
- the levels of electric signals photoelectrically converted by the light receiving surfaces A, B, C, D, E, F, G, and H are respectively represented as A, B, C, D, E, F, G, and H. Indicated as H.
- the matrix circuit 5 receives the detection signals A, B, C, D, E, F, G, and H of the photodetector 209, and generates a focus error signal FES by the calculation of the following astigmatism method.
- FES (A + C)-(B + D)
- the matrix circuit 5 generates the track error signal TES by the following equation.
- TES (A + B) ⁇ (D + C) ⁇ k ⁇ ⁇ (E ⁇ F) + (GH) ⁇
- k is a constant.
- FIGS. 10A and 10B are diagrams showing the irradiation position of the light beam irradiated on the light receiving surface of the photodetector 209 moved by the radial shift of the objective lens 205.
- FIG. FIG. 10A shows that when the objective lens 205 is shifted in the inner peripheral direction of the optical disc 1, the light beams 241 to 245 are shifted upward in FIG. 10A, respectively.
- FIG. 10B shows that when the objective lens 205 is shifted in the outer circumferential direction of the optical disc 1, the light beams 241 to 245 are shifted downward in FIG. 10B, respectively.
- the signal (A + B) when the objective lens 205 is shifted in the radial direction of the optical disc 1 is used.
- -(C + D) waveform shift and signal (EF) + (GH) DC waveform offset occur. Therefore, the value of the signal (EF) + (GH) represents a value corresponding to the shift amount of the objective lens.
- (EF) + (G) The track error signal TES with the offset canceled is obtained by subtracting a constant multiple (k times) of the value of ⁇ H).
- a constant multiple of the value of the signal (EF) + (GH) instead of a constant multiple of the value of the signal (EF) + (GH), a constant multiple of the value of the signal (EF) or a constant multiple of the value of the signal (GH) may be used. Is possible.
- the optical head device or the optical disk device according to the second embodiment even if the objective lens 205 and the polarization hologram 204 are not shifted integrally, a general differential method is used.
- the offset of the track error signal TES can be suppressed by using an eight-divided photodetector for detecting the track error.
- FIG. 11 is a perspective view schematically showing a configuration of an optical head device 3b according to Embodiment 3 of the present invention.
- an optical head device 3b includes a semiconductor laser 301, a flat polarizing beam splitter 302 that acts as a reflecting surface in the forward path and gives astigmatism in the return path, a collimator lens 303, a quarter-wave plate 304, an objective A lens 305, a movable holding portion 306 that holds the objective lens 305, an objective lens actuator 307 that drives the movable holding portion 306 in the focus direction or the radial direction of the optical disc 1, a hologram 308 that is a non-polarized diffraction element, and light And a detector 309.
- the semiconductor laser 301, the collimator lens 303, the objective lens 305, and the photodetector 309 are the same as the semiconductor laser 201, the collimator lens 203, the objective lens 205, and the photodetector 209 in the second embodiment.
- the optical head device 3b according to the third embodiment is different from the first embodiment in that a cylindrical lens 208 (FIG. 2) is eliminated by using the flat polarizing beam splitter 302, and a hologram 308 is disposed immediately before the photodetector 309. This is different from the optical head device 3a according to the second embodiment.
- FIG. 1 and FIGS. 6A to 6C are also referred to.
- FIG. 12 is a plan view showing the hologram 308 of FIG.
- the hologram 308 is an area irradiated with both the zero-order light beam of the reflected light diffracted by the information track 1a of the optical disc 1 and the ⁇ first-order light beam of the reflected light (see FIG. 12).
- the first diffraction region 313 including the entire two regions 322 and 323, and the beam of the zero-order light of the reflected light is irradiated and the beam of ⁇ first-order light of the reflected light is irradiated.
- the first diffraction region 313 is irradiated on the hologram 308 by overlapping both the 0th-order beam of reflected light and the ⁇ 1st-order beam of reflected light.
- Each of the two areas 322 and 323 is an area having a shape (rectangle shown as a vertical hatching area in FIG. 12) that is expanded in the radial direction (lateral direction in FIG. 12).
- the second diffraction regions 311 and 312 are irradiated with a 0th-order light beam of reflected light on the hologram 308 and ⁇ 1st-order light beams of the reflected light. Is an area that is not irradiated and is located outside the first diffraction area 213 in the tangential direction of the optical disc 1 (two rectangular areas shown as two hatched areas in FIG. 12). Area).
- the diffraction region 313 is shaped so that the regions 322 and 323 do not protrude from the diffraction region 313 even when the objective lens 305 is shifted in the radial direction perpendicular to the information track 1a.
- FIG. 13 is a diagram showing a light receiving surface of the photodetector 309 in FIG. 11 and an irradiation region of the laser light divided into seven by the hologram 308.
- the light detector 309 diffracts (transmits) the zero-order light of the diffracted light generated in the first diffraction region 313 and the second diffraction regions 311 and 312 of the hologram 308 (that is, the reflected light from the optical disc 1 is diffracted (transmitted) by the hologram 308.
- the first light receiving unit 331 is formed of a plurality of light receiving surfaces arranged adjacent to each other in a direction corresponding to at least the radial direction for receiving the first light beam 341 that is the 0th order light generated by
- the light detector 309 corresponds to the radial direction in which the two second light beams 342 and 343 that are the + 1st order light of the diffracted light generated in the second diffraction regions 311 and 312 of the hologram 308 are received.
- a second light receiving portion 332 composed of a plurality of light receiving surfaces arranged adjacent to each other in the direction, and third light beams 344 and 345 which are ⁇ 1st order light of the diffracted light generated by the second diffraction regions 311 and 312.
- the light receiving surface of the photodetector 309 is an eight-divided photodetector for differential track error detection, which is a general method for generating a track error signal in an optical disc apparatus.
- the light detector 309 includes four light receiving surfaces A, B, C, and D that constitute the first light receiving unit 331, two light receiving surfaces E and F that constitute the second light receiving unit 332, and a third light receiving unit.
- a total of eight light receiving surfaces including two light receiving surfaces G and H constituting the portion 333 are provided.
- the shape of each light receiving surface is the same as that of the second embodiment.
- the first light beam 341 that is the zero-order light of the diffracted light generated by the hologram 308 (passed through the hologram 308) reaches the light receiving surfaces A, B, C, and D of the first light receiving unit 331.
- the + 1st order light of the diffracted light generated by the second diffraction regions 311 and 312 of the hologram 308 reaches the light receiving surfaces E and F of the second light receiving unit 332 as second light beams 342 and 343, and the hologram 308
- the ⁇ 1st order light of the diffracted light generated by the diffraction regions 311 and 312 reaches the light receiving surfaces G and H of the third light receiving unit 333 as third light beams 344 and 345.
- the ⁇ first-order light diffracted by the first diffraction region 313 of the hologram 308 reaches the light receiving surface of the photodetector 309 as light beams 346 and 347.
- the levels of electric signals photoelectrically converted by the light receiving surfaces A, B, C, D, E, F, G, and H are respectively represented as A, B, C, D, E, F, G, and H. Indicated as H.
- FIG. 14 (a) and 14 (b) are diagrams showing the irradiation position of the light beam irradiated on the light receiving surface of the photodetector 309 moved by the radial shift of the objective lens 305.
- FIG. FIG. 14A shows that when the objective lens 305 is shifted in the inner circumferential direction of the optical disc 1, the light beams 341 to 345 are shifted upward in FIG. 14A, respectively.
- FIG. 14B shows that when the objective lens 305 is shifted in the outer peripheral direction of the optical disc 1, the light beams 341 to 345 are shifted downward in FIG. 14B, respectively.
- the signal (A + B) when the objective lens 305 is shifted in the radial direction of the optical disk 1 is used.
- -(C + D) waveform shift and signal (EF) + (GH) DC waveform offset occur. Therefore, the value of the signal (EF) + (GH) represents a value corresponding to the shift amount of the objective lens.
- (EF) + (G) The track error signal TES with the offset canceled is obtained by subtracting a constant multiple (k times) of the value of ⁇ H).
- a constant multiple of the value of the signal (EF) + (GH) instead of a constant multiple of the value of the signal (EF) + (GH), a constant multiple of the value of the signal (EF) or a constant multiple of the value of the signal (GH) may be used. Is possible.
- the cylindrical lens 208 (FIG. 7) is eliminated using the plate polarization beam splitter 302, and the hologram 308 is placed immediately before the photodetector 309. Even in the case where the track error signal TES is arranged, the offset of the track error signal TES can be suppressed by using a general differential type eight-divided photodetector for detecting a track error.
- the flat polarizing beam splitter 302 may not be deflectable.
- the diffraction region 313 of the hologram 308 has a shape that does not protrude from the diffraction region 313 when the objective lens 305 is shifted in the radial direction perpendicular to the information track 1a.
- the boundary between 311 and the boundary between the diffraction region 313 and the diffraction region 312 is not limited to a straight line.
- FIG. 15 is a plan view showing another example of the hologram 308 of FIG. In FIG. 15, the same reference numerals are given to the components corresponding to those in FIG.
- the hologram 308 has pentagonal second diffraction regions 311 and 312 in order to make the second diffraction regions 311 and 312 wider than in the case of FIG. In this case, the amount of light received by the photodetectors E, F, G, and H can be increased.
- the stray light components of the detection signals E, F, G, and H received by the photodetectors E, F, G, and H as stray light from adjacent layers in the case of a multilayer disk are not limited to Es, Fs, and Gs. , Hs, What is necessary is just to set the diffracted light amount ratio so as to satisfy E + F> 10 ⁇ (Es + Fs) and G + H> 10 ⁇ (Gs + Hs).
- FIG. 16 is a perspective view schematically showing a configuration of a fourth embodiment that is another example of positions of the objective lenses 105, 205, and 305 in the first, second, and third embodiments.
- a track error signal can be obtained by one beam, so that the objective lenses 105, 205, and 305 have a disc radius line 1c passing through the center 1b of the optical disc 1.
- the optical head device when the optical head device is capable of reading a plurality of discs of different standards (for example, a CD, a DVD, a disc for blue laser light, etc.) and includes a plurality of objective lenses, the objective lenses 105 and 205 are used. , 305 are arranged at the off-center position (on the objective lens movement line 1d), and another objective lens corresponding to another standard can be arranged on the disk radius line 1c.
- a plurality of discs of different standards for example, a CD, a DVD, a disc for blue laser light, etc.
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Abstract
Description
図1は、本発明の実施の形態1に係る光ディスク装置の構成を概略的に示す図である。図1に示されるように、光ディスク装置は、光ディスク1が装着されるターンテーブル(図示せず)と、記録又は再生時にターンテーブルを回転駆動させるディスク駆動部としてのスピンドルモータ2と、光ディスク1上のデータの読み出し又はデータの書き込みを行なう光ヘッド装置3と、光ヘッド装置3を光ディスクのラジアル(半径)方向にシフトさせる移動手段4とを有する。また、光ディスク装置は、光ヘッド装置3の光検知器(後述の図2に示す。)の各受光面(受光素子)によって検出された光ビームの受光光量に応じた電気信号が供給されるマトリクス回路5と、信号再生回路6と、サーボ回路7と、スピンドル制御回路8と、レーザ制御回路9と、スレッド制御回路10と、コントローラ11とを有する。
FES=(A+C)-(B+D)
また、マトリクス回路5は、トラックエラー信号TESを、次式の演算によって生成する。
TES=(A+B)-(D+C)-k×{(E-F)+(G-H)}
ここで、kは定数である。
図7は、本発明の実施の形態2に係る光ヘッド装置3aの構成を概略的に示す斜視図である。図7において、光ヘッド装置3aは、半導体レーザ201と、偏光ビームスプリッタ202と、コリメータレンズ203と、光ヘッド装置3aに固定された回折素子である偏光性ホログラム204と、1/4波長板(図示せず)と、対物レンズ205と、対物レンズ205を保持する可動保持部206と、可動保持部206をフォーカス方向又は光ディスク1のラジアル方向に駆動する対物レンズアクチュエータ207と、非点収差を与える光学素子であるシリンドリカルレンズ208と、光検知器209とを備えている。半導体レーザ201、偏光ビームスプリッタ202、コリメータレンズ203、1/4波長板(図示せず)、対物レンズ205と、シリンドリカルレンズ208、及び光検知器209は、実施の形態1における半導体レーザ101、偏光ビームスプリッタ102、コリメータレンズ103、1/4波長板(図示せず)、対物レンズ105と、シリンドリカルレンズ108、及び光検知器109と同様である。実施の形態2に係る光ヘッド装置3aは、可動保持部206が対物レンズ205を保持し、偏光性ホログラム204を保持していない点、及び、偏光性ホログラム204の偏光領域の形状のみが、実施の形態1に係る光ヘッド装置3と相違する。したがって、実施の形態2の説明においては、図1及び図6(a)~(c)をも参照する。
FES=(A+C)-(B+D)
また、マトリクス回路5は、トラックエラー信号TESを、次式の演算によって生成する。
TES=(A+B)-(D+C)-k×{(E-F)+(G-H)}
ここで、kは定数である。
図11は、本発明の実施の形態3に係る光ヘッド装置3bの構成を概略的に示す斜視図である。図11において、光ヘッド装置3bは、半導体レーザ301と、往路は反射面として働き、復路では非点収差を与える平板偏光ビームスプリッタ302と、コリメータレンズ303と、1/4波長板304と、対物レンズ305と、対物レンズ305を保持する可動保持部306と、可動保持部306をフォーカス方向又は光ディスク1のラジアル方向に駆動する対物レンズアクチュエータ307と、無偏光の回折素子であるホログラム308と、光検知器309とを備えている。半導体レーザ301、コリメータレンズ303、対物レンズ305、及び光検知器309は、実施の形態2における半導体レーザ201、コリメータレンズ203、対物レンズ205、及び光検知器209と同様である。実施の形態3に係る光ヘッド装置3bは、平板偏光ビームスプリッタ302を用いてシリンドリカルレンズ208(図2)を無くした点、及びホログラム308を光検知器309の直前に配置した点が、実施の形態2に係る光ヘッド装置3aと相違する。実施の形態3の説明においては、図1及び図6(a)~(c)をも参照する。
FES=(A+C)-(B+D)
また、マトリクス回路5は、トラックエラー信号TESを、次式の演算によって生成する。
TES=(A+B)-(D+C)-k×{(E-F)+(G-H)}
ここで、kは定数である。
E+F>10×(Es+Fs)、及び、G+H>10×(Gs+Hs)を満足するような、回折光量比の設定であればよい。
図16は、実施の形態1、2、及び3における対物レンズ105,205,305の位置の他の例である実施の形態4の構成を概略的に示す斜視図である。図16に示されるように、実施の形態1、2、及び3では、1ビームによりトラックエラー信号が得られるので、対物レンズ105,205,305は、光ディスク1の中心1bを通るディスク半径線1cに対して距離Lだけオフセンター(偏心)した直線(対物レンズ移動線)1dにてディスク1に対向させることが可能である。したがって、異なる複数の規格のディスク(例えば、CD,DVD,青色レーザ光用のディスクなど)を読み取ることができる光ヘッド装置であって、複数の対物レンズを備える場合には、対物レンズ105,205,305をオフセンター位置(対物レンズ移動線1d上)に配置し、他規格に対応した他の対物レンズをディスク半径線1c上に配置することも可能になる。
Claims (11)
- レーザ光を出射するレーザ光源と、
光ディスクに向かう前記レーザ光を集光し、及び、前記光ディスクの情報トラックによって回折された反射光を集光する対物レンズと、
前記対物レンズで集光された前記反射光を回折させる回折素子と、
前記反射光に非点収差を与える光学素子と、
前記反射光を受光する光検知器と、
外部から駆動信号を受信し、前記駆動信号の値に応じた量だけ、前記対物レンズを少なくとも前記光ディスクのラジアル方向にシフトさせる対物レンズアクチュエータと
を有する光ヘッド装置であって、
前記回折素子は、
前記反射光の0次光のビームと前記反射光の±1次光のビームの両方が重なって照射される領域の全体を含む第1の回折領域と、
前記反射光の0次光のビームが照射され前記反射光の±1次光のビームが照射されない領域を含み、前記第1の回折領域を含まない第2の回折領域とを有し、
前記光検知器は、
前記第1の回折領域及び前記第2の回折領域で生成された前記回折光の0次光である第1の光ビームを受光する少なくとも前記ラジアル方向に対応する方向に隣接して並ぶ複数の受光面を有する第1の受光部と、
前記第2の回折領域で生成された前記回折光の+1次光である第2の光ビームを受光する前記ラジアル方向に対応する方向に隣接して並ぶ複数の受光面を有する第2の受光部、及び、前記第2の回折領域で生成された前記回折光の-1次光である第3の光ビームを受光する前記ラジアル方向に対応する方向に隣接して並ぶ複数の受光面を有する第3の受光部の少なくとも一方とを有する
ことを特徴とする光ヘッド装置。 - 前記対物レンズと前記回折素子とを一体に保持する保持部を有し、
前記対物レンズアクチュエータによる前記対物レンズのシフトは、前記保持部をシフトさせることによって実行される
ことを特徴とする請求項1に記載の光ヘッド装置。 - 前記第1の回折領域は、前記回折素子上において前記反射光の0次光のビームと前記反射光の±1次光のビームとが重なって照射される2つの領域に一致する形状を有し、
前記第2の回折領域は、前記回折素子上において前記反射光の0次光のビームが照射され前記反射光の±1次光のビームが照射されない領域に一致する形状を有する
ことを特徴とする請求項2に記載の光ヘッド装置。 - 前記対物レンズを保持し、前記回折素子を保持しない保持部を有し、
前記対物レンズアクチュエータによる前記対物レンズのシフトは、前記保持部をシフトさせることによって実行される
ことを特徴とする請求項1に記載の光ヘッド装置。 - 前記第1の回折領域は、前記回折素子上において前記反射光の0次光のビームと前記反射光の±1次光のビームの両方が重なって照射される2つの領域のそれぞれを前記ラジアル方向に拡張した形状を有する領域である
ことを特徴とする請求項4に記載の光ヘッド装置。 - 前記第2の回折領域は、前記回折素子上において前記反射光の0次光のビームが照射され前記反射光の±1次光のビームが照射されない領域であって、前記第1の回折領域よりも前記光ディスクのタンジェンシャル方向の外側に位置する領域である
ことを特徴とする請求項4又は5に記載の光ヘッド装置。 - 前記対物レンズは、光ディスクのディスク半径線に対してオフセンターして配置される
ことを特徴とする請求項1乃至6のいずれか1項に記載の光ヘッド装置。 - 前記光検知器の前記第2の受光部の複数の受光面は、前記ラジアル方向に対応する方向に隣接して並ぶ2つの受光面であり、
前記光検知器の前記第3の受光部の複数の受光面は、前記ラジアル方向に対応する方向に隣接して並ぶ2つの受光面である
ことを特徴とする請求項1乃至7のいずれか1項に記載の光ヘッド装置。 - 前記光検知器の前記第2の受光部の2つの受光面の境界線は、前記タンジェンシャル方向に対応する方向に延びる直線であり、
前記光検知器の前記第3の受光部の2つの受光面の境界線は、前記タンジェンシャル方向に対応する方向に延びる直線である
ことを特徴とする請求項8に記載の光ヘッド装置。 - 前記光検知器の前記第1の受光部の複数の受光面は、前記光ディスクのラジアル方向に対応する方向及びタンジェンシャル方向に対応する方向に隣接して並ぶ4つの受光面である
ことを特徴とする請求項1乃至9のいずれか1項に記載の光ヘッド装置。 - 光ディスクを回転させるディスク駆動部と、
回転する前記光ディスクからの情報の読み取り又は前記光ディスクへの情報の書き込みを行なう、請求項1乃至10のいずれか1項に記載の光ヘッド装置と、
前記第1の受光部の複数の受光面の検出信号と、前記第2の受光部の複数の受光面の検出信号及び前記第3の受光部の複数の受光面の検出信号の少なくとも一方とを受信し、前記第1の受光部の複数の受光面の検出信号の差から、前記第2の受光部の複数の受光面の検出信号の差及び前記第3の受光部の複数の受光面の検出信号の差の少なくとも一方から算出された信号の定数倍の値を差し引いてトラックエラー信号を生成し、前記トラックエラー信号を前記駆動信号として前記対物レンズアクチュエータに出力するサーボ回路と
を有することを特徴とする光ディスク装置。
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EP09806549A EP2315203A4 (en) | 2008-08-11 | 2009-07-10 | OPTICAL HEAD AND OPTICAL PLATE DEVICE |
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- 2009-07-10 WO PCT/JP2009/003234 patent/WO2010018653A1/ja active Application Filing
- 2009-07-10 CN CN2009801311861A patent/CN102119416B/zh not_active Expired - Fee Related
- 2009-07-10 US US13/056,123 patent/US8483022B2/en not_active Expired - Fee Related
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120106310A1 (en) * | 2010-01-18 | 2012-05-03 | Masahisa Shinoda | Optical head device and optical disc device |
US8472300B2 (en) * | 2010-01-18 | 2013-06-25 | Mitsubishi Electric Corporation | Optical head device and optical disc device |
JP2013093087A (ja) * | 2011-10-07 | 2013-05-16 | Panasonic Corp | 光ピックアップおよび光記録再生装置 |
WO2013084588A1 (ja) * | 2011-12-05 | 2013-06-13 | 三菱電機株式会社 | 光ヘッド装置及び光ディスク装置 |
JP5562493B2 (ja) * | 2011-12-05 | 2014-07-30 | 三菱電機株式会社 | 光ヘッド装置及び光ディスク装置 |
CN103959382A (zh) * | 2011-12-05 | 2014-07-30 | 三菱电机株式会社 | 光学头装置以及光盘装置 |
US8891342B2 (en) | 2011-12-05 | 2014-11-18 | Mitsubishi Electric Corporation | Optical head device and optical disc device |
DE112012005064B4 (de) * | 2011-12-05 | 2016-02-11 | Mitsubishi Electric Corporation | Optokopfeinrichtung und optische Speicherplatteneinrichtung |
CN103959382B (zh) * | 2011-12-05 | 2016-06-08 | 三菱电机株式会社 | 光学头装置以及光盘装置 |
Also Published As
Publication number | Publication date |
---|---|
JP5174913B2 (ja) | 2013-04-03 |
JPWO2010018653A1 (ja) | 2012-01-26 |
CN102119416A (zh) | 2011-07-06 |
EP2315203A4 (en) | 2012-03-28 |
US20110128832A1 (en) | 2011-06-02 |
EP2315203A1 (en) | 2011-04-27 |
US8483022B2 (en) | 2013-07-09 |
CN102119416B (zh) | 2012-12-26 |
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