WO2007037479A1 - 光学ヘッド装置 - Google Patents
光学ヘッド装置 Download PDFInfo
- Publication number
- WO2007037479A1 WO2007037479A1 PCT/JP2006/319701 JP2006319701W WO2007037479A1 WO 2007037479 A1 WO2007037479 A1 WO 2007037479A1 JP 2006319701 W JP2006319701 W JP 2006319701W WO 2007037479 A1 WO2007037479 A1 WO 2007037479A1
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- WIPO (PCT)
- Prior art keywords
- optical head
- head device
- light beam
- objective lens
- light
- Prior art date
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Classifications
-
- 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
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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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
- G11B7/1362—Mirrors
-
- 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 head device for forming a light spot on a disc-shaped information recording medium for recording information on the information recording medium or reproducing information from the information recording medium, and the same.
- the present invention relates to a disc recording device, a disc playback device, and a disc recording / playback device.
- disc recording / playback apparatuses have been adapted to various recording media such as for DVD (Digital Versatile Disc), for BD (Blue-ray Disc), for CD (Compact Disc), and for personal computers. Its uses are becoming more diverse every year.
- DVD Digital Versatile Disc
- BD Blu-ray Disc
- CD Compact Disc
- Its uses are becoming more diverse every year.
- higher recording density there is a need for higher performance and higher recording density of disk recording / reproducing devices.
- notebook personal computers and disk recording / reproducing devices for mopile There is also a strong demand for downsizing and thinning.
- FIG. 26 is an optical system configuration diagram showing a main part of an optical head device according to the prior art.
- the optical head device according to the prior art includes objective lenses 7 and 14 for condensing laser beams of different wavelengths emitted from a light source and irradiating the information recording medium 8, and reflecting each laser beam to change the direction. Equipped with launch mirrors 5 and 12 for changing.
- the thickness of the object lenses 7 and 14 is A
- the movable range of the objective lenses 7 and 14 is B
- the beam diameter of the laser light incident on the rising mirrors 5 and 12 is C.
- the dimensional margin for taking into account the outline of the mirrors 5 and 12 and the uneven deposition of the reflective film is D
- the distance (working distance) from the objective lenses 7 and 14 to the information recording medium 8 is Dw.
- H be the overall height of the device
- NA be the numerical aperture of the objective lens
- f be the focal length.
- the beam diameter C is expressed by the following equation (1)
- the height H of the entire optical head device is expressed by the following equation (2).
- FIG. 27 is an optical system configuration diagram showing a main part of the optical head device in the case where laser light having a wavelength of 405 nm is used in the optical head device shown in FIG.
- the laser beam having a wavelength of 405 nm emitted from the light source is converted from linearly polarized light to circularly polarized light by the 1Z4 wavelength plate 6 and is incident on the rising mirror 5.
- the rising mirror 5 transmits laser light having a wavelength of 405 nm.
- the laser beam that has passed through the rising mirror 5 is incident on the rising mirror 12 and reflected.
- the laser light reflected by the rising mirror 12 is collected by the objective lens 14 to form a light spot on the information recording medium 8.
- the objective lens 14 moves up to the position 14a in the focusing direction within the movable range B in order to follow the surface shake of the information recording medium 8, and the objective lens 7 is linked to the objective lens 14 at the maximum position 7a. Move to.
- FIG. 28 is an optical system configuration diagram showing a main part of the optical head device in the case where laser light having a wavelength of 650 nm is used in the optical head device shown in FIG.
- the laser light having a wavelength of 650 nm emitted from the light source is converted from linearly polarized light to circularly polarized light by the 1Z4 wavelength plate 6 and reflected by the rising mirror 5.
- the laser beam reflected by the rising mirror 5 is condensed by the objective lens 7 to form a light spot on the information recording medium 8.
- the objective lens 7 moves up to the position 7b in the focus direction within the movable range B in order to follow the surface shake of the information recording medium 8, and the objective lens 14 is linked to the objective lens 7 at the maximum position 14b. Move up.
- Patent Document 1 Japanese Patent Application Laid-Open No. 11 120587.
- the objective lenses 7 and 14 move in conjunction with each other, so as shown in FIG.
- the raising mirror 12 and the objective lens 14 may collide. This collision occurs when the objective distances Dw of the objective lenses 7 and 14 are different, or when one of the objective lenses 7 and 14 is installed at the other position.
- the same problem may occur when it is arranged on the lower side. Therefore, in order to avoid this collision, the height H of the optical head device has to be increased, and there is a problem that it is difficult to reduce the size and thickness of the optical head device.
- An object of the present invention is to solve the above problems and provide a small and thin optical head device, and a disk recording device, a disk reproducing device, and a disk recording / reproducing device including the same.
- An optical head device includes at least one light beam direction changing unit that changes the direction of a light flux emitted from a light source and having a predetermined wavelength, and an opening different from each other.
- a plurality of objective lenses that collect and irradiate the information recording medium with a light beam whose direction is changed by the light beam direction changing means, and the light beam incident on the information recording medium is in a focused state.
- a second moving means for moving the light beam direction changing means.
- the at least one light beam direction changing unit may include a surface reflection type mirror having a surface reflectance corresponding to a wavelength of an incident light beam.
- the at least one light beam direction changing means may include a prism comprising a light beam incident surface that transmits the incident light beam and an inner surface reflector that changes the direction of the transmitted light beam.
- the at least one light beam direction changing means includes a surface reflection type mirror having a surface reflectance corresponding to the wavelength of the incident light beam, a light beam incident surface that transmits the incident light beam, and the transmission light. And a prism with an internal reflector that changes the direction of the reflected light flux.
- the optical head device includes a plurality of light beam direction changing units, and at least one of the plurality of light beam direction changing units is provided at a position facing a corresponding objective lens, while the plurality of light beam directions are provided.
- a holding member that holds the plurality of light beam direction changing means at a predetermined interval so that at least one of the changing means is offset at a position that does not face the corresponding object lens;
- Transportation means May move the light beam direction changing means by moving the holding member in one or more dimensions so that at least one of the plurality of light beam direction changing means faces the corresponding objective lens.
- the optical head device further includes a plurality of light beam direction changing means, and the second moving means is arranged such that at least one of the plurality of light beam direction changing means faces a corresponding object lens. Next, rotate the opposite beam direction changing means to move it.
- the plurality of objective lenses are arranged in a radial direction of the information recording medium, and the second moving means moves the light beam direction changing means in the radial direction. You can do it!
- the plurality of objective lenses are arranged in a tangential direction of the information recording medium, and the second moving unit includes the light beam direction changing unit. Move it in the direction of the local.
- the second moving unit may include a lock mechanism that fixes the light beam direction changing unit at a predetermined position.
- the second moving unit may include any one of a piezoelectric element, a stepping motor, a DC motor, and an ultrasonic motor.
- the second moving unit may move the light beam direction changing units stepwise or steplessly.
- a disc recording apparatus is characterized in that it includes the above-described optical head device in addition to a disc recording apparatus that records an information signal using a light beam on a disc-shaped information recording medium. .
- a disc reproducing apparatus includes a disc reproducing apparatus that reproduces an information signal by using a disk-shaped information recording medium force beam, and includes the optical head device. It is characterized by.
- a disc recording / reproducing apparatus records an information signal using a light beam on a disc-shaped information recording medium, and reproduces the information signal using the light beam from the information recording medium.
- the apparatus includes the above-described optical head device. The invention's effect
- the optical head device of the present invention since the second moving means for moving the light beam direction changing means is provided, the objective lens and the light beam direction changing means without increasing the height of the optical head device. And a small and thin optical head device can be realized.
- the light beam direction changing means can realize a small and thin optical head device at low cost.
- the light beam diameter and the light beam direction are included.
- the inclination of the changing means can be reduced, and an even smaller and thinner optical head device can be realized.
- the light beam direction changing means includes the surface reflection type mirror and the prism, a small and thin optical head device can be realized.
- At least one light beam direction changing means is provided offset, so that the objective lens and the light beam direction can be changed without increasing the height of the optical head device. Collision with the means can be prevented, and a small and thin optical head device can be realized.
- the second moving means has the opposite light beam so that at least one of the plurality of light beam direction changing means faces the corresponding objective lens.
- the plurality of objective lenses are arranged in the tangential direction or the radial direction, and the second moving means moves the light beam direction changing means in the tangential direction or the radial direction, so that the radial direction or the tangential direction is obtained.
- An optical head device that is small and thin in the direction can be realized.
- the second moving means since the second moving means includes a lock mechanism, the position of the light beam direction changing means can be accurately fixed, and an optical head device resistant to vibration can be realized. [0031] Furthermore, since the second moving means moves the light beam direction changing means stepwise or steplessly, the light beam direction changing means can be arranged at an optimum position, so that the light beam direction changing means can be reduced in size. Therefore, the vignetting of the light beam by the light beam direction changing means can be reduced, and a small and high performance optical head device can be realized.
- FIG. 1 is an optical system configuration diagram showing an optical head device according to a first embodiment of the present invention.
- FIG. 2 is an optical system configuration diagram showing a main part of the optical head device according to the first embodiment of the present invention.
- FIG. 3 is an exploded perspective view showing the configuration of the objective lens actuator 13 of FIGS. 1 and 2.
- FIG. 3 is an exploded perspective view showing the configuration of the objective lens actuator 13 of FIGS. 1 and 2.
- FIG. 4 is a block diagram showing a configuration of a light receiving surface of a light receiving element 16 in FIG. 1 and a focus servo control circuit.
- FIG. 5 is a block diagram showing a configuration of a light receiving surface of the light receiving element 16 of FIG. 1 and a tracking servo control circuit.
- FIG. 6A is an exploded perspective view showing the configuration of the optical head device according to the first embodiment of the present invention.
- FIG. 6B is a perspective view showing an assembled state of the optical head device of FIG. 6A.
- FIG. 7 is an exploded perspective view showing a configuration of a main part of the disc recording / reproducing apparatus according to the first embodiment of the present invention.
- FIG. 8A is an exploded perspective view showing an example of the configuration of the moving mechanism 33 according to the first embodiment of the present invention.
- FIG. 8B is a cross-sectional view showing an example of the configuration of the moving mechanism 33 according to the first embodiment of the present invention.
- FIG. 9 is an optical system configuration diagram showing a main part of the optical head device according to the first embodiment of the present invention when a laser beam having a wavelength of 405 nm is used.
- FIG. 10 is an optical system configuration diagram showing a main part of the optical head device according to the first embodiment of the present invention when a laser beam having a wavelength of 650 nm is used.
- FIG. 11 is an optical system configuration diagram showing a main part of an optical head device according to a first modification of the first embodiment of the present invention.
- FIG. 12 is an optical system configuration diagram showing a main part of an optical head device according to a second modification of the first embodiment of the present invention.
- FIG. 13 is an optical system configuration diagram showing a main part of an optical head device according to a second embodiment of the present invention when a laser beam having a wavelength of 405 nm is used.
- FIG. 14 is an optical system configuration diagram showing a main part of an optical head device according to a second embodiment of the present invention when a laser beam having a wavelength of 650 nm is used.
- FIG. 15 is an optical system configuration diagram showing a main part of an optical head device according to a modification of the second embodiment of the present invention.
- FIG. 16 is an optical system configuration diagram showing a main part of an optical head device according to a third embodiment of the present invention when a laser beam having a wavelength of 405 nm is used.
- FIG. 17 is an optical system configuration diagram showing a main part of an optical head device according to a third embodiment of the present invention when a laser beam having a wavelength of 650 nm is used.
- FIG. 19 is an optical system configuration diagram showing a main part of an optical head device according to a fourth embodiment of the present invention when a laser beam having a wavelength of 650 nm is used.
- FIG. 20 is an exploded perspective view showing the configuration of the moving mechanism 33B according to the first embodiment of the present invention.
- FIG. 21 is an optical system configuration diagram showing a main part of an optical head device according to a third modification of the first embodiment of the present invention.
- FIG. 22 is an optical system configuration diagram showing a main part of an optical head device according to a fifth embodiment of the present invention.
- FIG. 23 is an optical system configuration diagram showing the main part of an optical head device according to a sixth embodiment of the present invention.
- FIG. 24 is an optical system configuration diagram showing the main part of the optical head device when two prisms are arranged side by side.
- FIG. 25 is a block diagram showing a configuration of a disk recording / reproducing apparatus equipped with the optical head device according to the first embodiment of the present invention.
- FIG. 26 is an optical system configuration diagram showing the main part of an optical head device according to the prior art.
- FIG. 27 is an optical system configuration diagram showing a main part of an optical head device according to the prior art when a laser beam having a wavelength of 405 nm is used.
- FIG. 28 is an optical system configuration diagram showing the main part of an optical head device according to the prior art when laser light having a wavelength of 650 nm is used.
- Optical head device control circuit ... Optical head device
- Traverse motor control circuit ... Tranose motor, 75 . Spindle motor control circuit,
- FIG. 1 is an optical system configuration diagram showing the optical head device according to the first embodiment.
- the optical head device according to the present embodiment records an information signal using a light beam on a disc-shaped information recording medium 8 such as a DVD (Digital Versatile Disc) and a BD (Blue-ray Disc), for example. It is installed in a disk recording / reproducing device that reproduces information signals from the medium 8 using light flux.
- the optical head device according to the present embodiment includes semiconductor lasers 1 and 9, collimating lenses 2 and 10, polarization beam splitters 3 and 11, a wavelength selective prism 4, and a quarter-wave plate.
- the light receiving elements 16 and 18 and a moving mechanism 33 for moving the rising mirror 30 are provided.
- the semiconductor laser 1 outputs a laser beam with a wavelength of 650 nm for reading a DVD or the like
- the semiconductor laser 9 outputs a laser beam with a wavelength of 405 nm for reading a BD or the like, for example.
- the numerical aperture (NA) of the objective lens 14 is larger than the numerical aperture of the objective lens 7, and the thickness of the objective lens 14 is larger than the thickness of the objective lens 7.
- FIG. 2 is an optical system configuration diagram showing a main part of the optical head device according to the present embodiment.
- the raising mirror 30 is held by a holding member 31, and the holding member 31 is attached to a moving mechanism 33 using a drive source 32 such as a stepping motor, a DC motor, or an ultrasonic motor. It is moved in the tangential chanore direction.
- a drive source 32 such as a stepping motor, a DC motor, or an ultrasonic motor. It is moved in the tangential chanore direction.
- the disc recording / reproducing apparatus when the disc recording / reproducing apparatus recognizes that the inserted information recording medium 8 is a BD, for example, the rising mirror 30 faces the objective lens 14 by the moving mechanism 33.
- the semiconductor laser 9 After being moved to the position 30a, the semiconductor laser 9 emits a laser beam having a wavelength of 405 nm.
- the divergent light beam having a wavelength of 405 nm emitted from the semiconductor laser 9 is converted into a parallel light beam by the collimator lens 10 and enters the polarization beam splitter 11.
- the polarization beam splitter 11 transmits substantially all of the polarized light (P-polarized light) component in the direction of arrow W in FIG.
- the light beam that has passed through the polarizing beam splitter 11 enters the wavelength selective prism 4. Since the wavelength selective prism 4 substantially reflects all the light beams having wavelengths other than 650 nm, the light beam having a wavelength of 405 nm is substantially totally reflected by the wavelength selective prism 4 and enters the 1Z4 wavelength plate 6.
- the quarter wave plate 6 converts linearly polarized light into circularly polarized light and enters it.
- the light beam converted by the 1Z4 wavelength plate 6 is reflected by the rising mirror 30 and then condensed by the objective lens 14, whereby a light spot is irradiated onto the information recording medium 8.
- the light beam reflected by the information recording medium 8 passes through the objective lens 14 again, is reflected by the rising mirror 30, and enters the 1Z4 wavelength plate 6.
- the light beam incident on the 1Z4 wavelength plate 6 is converted from circularly polarized light to linearly polarized light, reflected by the wavelength selective prism 4, reflected by the polarizing beam splitter 11, and incident on the detection lens 17 and detected by the light receiving element 18.
- the detection lens 17 has a convex lens on the entrance surface and a cylindrical lens on the exit surface in order to perform an astigmatism method, which is one of the so-called focus servo detection methods. Yes.
- the raising mirror 30 is moved to the position 30b facing the objective lens 7 by the moving mechanism 33.
- the semiconductor laser 1 emits a laser beam having a wavelength of 650 nm.
- the divergent light beam having a wavelength of 650 nm output from the semiconductor laser 1 is converted into a parallel light flux by the collimator lens 2 and enters the polarization beam splitter 3.
- the polarizing beam splitter 3 transmits substantially all of the polarized light (P-polarized light) component in the direction of the arrow W in FIG.
- the wavelength selective prism 4 emits light with a wavelength of 650 nm. Substantially all of the light is transmitted, and substantially all other wavelengths are reflected.
- the light beam that has passed through the wavelength selective prism 4 is incident on the 1Z4 wavelength plate 6.
- the 1Z4 wave plate 6 converts linearly polarized light into circularly polarized light and enters it.
- the light beam converted by the 1Z4 wavelength plate 6 is reflected by the rising mirror 30, then condensed by the objective lens 7, and the light spot is irradiated onto the information recording medium 8.
- the light beam reflected by the information recording medium 8 passes through the objective lens 7 again, is reflected by the rising mirror 30, and enters the 1Z4 wavelength plate 6.
- the light beam incident on the 1Z4 wavelength plate 6 is converted from circularly polarized light to linearly polarized light.
- the light beam having a wavelength of 650 ⁇ m emitted from the semiconductor laser 1 passes through the wavelength selective prism 4, is reflected by the polarization beam splitter 3, enters the detection lens 15, and is detected by the light receiving element 16.
- the incident surface of the detection lens 15 is a convex lens
- the exit surface of the detection lens 15 is a concave lens.
- the rising mirror 30 has a surface reflectance that can reflect at least a light beam having a wavelength of 650 nm and a wavelength of 405 nm.
- the initial position of the raising mirror 30 (the position immediately after the start of the optical head device or when neither of the objective lenses 7 and 14 is used) can be moved to a desired position in a short time. It is preferable that the position is intermediate between the objective lens 7 and the objective lens 14.
- the light receiving surface of the light receiving element 16 is positioned approximately in the middle of the first focal point 19a and the second focal point 20a of the detection lens 15 in the optical axis direction (Z direction in FIG. 1). In the optical axis direction (Z direction in Fig. 1)
- the exit lens 17 is located approximately in the middle between the first focus 19b and the second focus 20b.
- FIG. 3 is an exploded perspective view showing the configuration of the objective lens actuator 13 shown in FIGS. 1 and 2.
- the objective lens actuator 13 includes a lens holder 23 for holding the objective lenses 7 and 14, a wire suspension 24, a fixed base 25 for holding the wire suspension 24, a yoke 26, A magnet 27, a focus coil 28, and a tracking coil 29 are provided.
- the objective lens actuator 13 moves the objective lenses 7 and 14 integrally in the focusing direction by the focus coil 28 and the magnet 27, and energizes the tracking coil 29 so that the objective lenses 7 and 14 are radially integrated. Move in the direction.
- FIG. 4 shows the configuration of the light receiving surface of the light receiving element 16 in FIG. 1 and the focus servo control circuit. It is a block diagram.
- the light receiving element 16 includes four light receiving portions 16a to 16d, and outputs a focus error signal by a push-pull method.
- the hatched portion indicates a diffraction region of 0th order light and ⁇ 1st order light.
- Each light receiving part 16a-16d outputs the output signal according to the light-receiving amount in each light-receiving surface.
- the adder 50 adds and outputs the output signals of the light receiving parts 16b and 16c, and the adder 51 adds and outputs the output signals of the light receiving parts 16a and 16d.
- the subtractor 52 subtracts the output signal of the calorimeter 51 from the output signal of each adder 50 and outputs it as a focus error signal.
- the focus error signal output from the subtractor 52 is input to the focus servo circuit 56 and used for focus servo control of the objective lens actuator 13 by the focus coil 28 and the magnet 27 in FIG.
- FIG. 5 is a block diagram showing the configuration of the light receiving surface of the light receiving element 16 of FIG. 1 and the tracking servo control circuit.
- the hatched portion indicates the diffraction region of 0th order light and ⁇ 1st order light.
- the light receiving element 16 is composed of the light receiving portions 16a to 16d, and outputs a tracking error signal by a push-pull method.
- Each of the light receiving portions 16a to 16d outputs an output signal corresponding to the amount of light received on each light receiving surface.
- the adder 53 adds and outputs the output signals of the light receiving units 16b and 16d
- the adder 54 adds and outputs the output signals of the light receiving units 16a and 16c.
- the subtractor 55 subtracts the output signal of the adder 53 from the output signal of each adder 52 and outputs it as a tracking error signal.
- the tracking error signal output from the subtractor 55 is input to the tracking servo circuit 57 and used for tracking servo control of the objective lens actuator 13 by the tracking coil 29 in FIG.
- the light receiving element 16 is configured by four light receiving portions 16a to 16d.
- the present invention is not limited to this configuration, and the light receiving element 16 has four or less or four or more light receiving elements. It may be configured by a part. Since the light receiving element 18 has the same configuration as that of the light receiving element 16, detailed description thereof is omitted.
- FIG. 6A is an exploded perspective view showing the configuration of the optical head device according to the present embodiment.
- FIG. 6B is a perspective view showing a state where the optical head device of FIG. 6A is assembled.
- the objective lens actuator 13 is adjusted in the tangential direction (Y direction) and the radial direction (X direction) with respect to the optical base 39 at the time of winding the needle, After skew adjustment in the radial angle direction ( ⁇ ⁇ direction) and radial angle direction ( ⁇ R direction), as shown in Fig. 6 ⁇ , it is fixed to the optical base 39 with an adhesive 34 or the like, and a cover 38 is placed thereon. Installed.
- FIG. 7 is an exploded perspective view showing the configuration of the main part of the disk recording / reproducing apparatus on which the optical head device 72 shown in FIGS. 6 and 6 is mounted.
- the optical head device is fitted to a main shaft 36 and a sub shaft 37 fixed to a mechanical base 35, and the main shaft 36 is moved in the radial direction by being rotated by a traverse motor 74.
- a spindle motor 76 is fitted into the hole 35 ⁇ provided in the mechanical base 35, and a turntable 77 for mounting the information recording medium 8 is fixed to the spindle motor 76 through the hole 35 ⁇ .
- the objective lens of the optical head device 72 forms a light spot at a predetermined position on the recording surface of the information recording medium 8 rotated by the spindle motor 76 through the hole 35 ⁇ of the mechanical base 35, and records on the information recording medium 8.
- the recorded information signal is reproduced, or the information signal is recorded on the information recording medium 8.
- FIG. 25 is a block diagram showing a configuration of a disk recording / reproducing apparatus equipped with the optical head device according to the present embodiment.
- the disk recording / reproducing device includes a controller 70, an optical head device control circuit 71, an optical head device 72, a traverse motor control circuit 73, a traverse motor 74, a spindle motor control circuit 75, and a spindle motor. 76, a turntable 77, an operation input unit 78, and a display output unit 79.
- the controller 70 controls the traverse motor 74 by controlling the traverse motor control circuit 73 and controls the spindle motor 76 by controlling the spindle motor control circuit 75 in accordance with the signal input from the operation input unit 78. .
- the controller 70 controls the optical head device 72 by controlling the optical head device control circuit 71 in accordance with the signal input from the operation input unit 78.
- the optical head device 72 reproduces the information signal of the information recording medium 8 placed on the turntable 77 rotated by the spindle motor 76 or transmits the information signal on the information recording medium 8. Record the issue.
- FIG. 8B is an exploded perspective view showing an example of the configuration of the moving mechanism 33 for moving the raising mirror 30.
- the moving mechanism 33 includes a drive source 32, gears 40 ⁇ , 40 ⁇ , A bearing 41 and a lead screw 42 are provided.
- the drive source 32 is, for example, a DC motor, a stepping motor, an ultrasonic motor, or the like.
- FIG. 8B is a cross-sectional view showing an example of the configuration of the moving mechanism 33 for moving the raising mirror 30.
- the holding member 31 that holds the rising mirror 30 is provided with a fitting portion 43.
- the fitting portion 43 is a protrusion that fits into a spiral groove provided in the lead screw 42, for example.
- the drive source 32 rotates, the rotation is transmitted to the lead screw 42 via the gears 40A and 40B, and the lead screw 42 rotates, whereby the holding member 31 that holds the rising mirror 30 moves in the tangential direction.
- the drive source 32 is connected to the lead screw 42 via the gear 40 and the bearing 41, but the drive source 32 and the lead screw 42 may be directly connected.
- FIG. 9 is an optical system configuration diagram showing the main part of the optical head device when a laser beam having a wavelength of 405 nm is used.
- the thickness of the objective lens 14 is A
- the movable range in the focus direction of the objective lenses 7 and 14 is B
- the beam diameter of the laser beam incident on the rising mirror 30 is C
- the rising mirror 30 Let D be the dimensional margin for taking into account the outer shape and uneven deposition of the reflective film, and Dw be the distance from the objective lenses 7 and 14 to the information recording medium 8 (the dark distance).
- H H.
- the objective lenses 7 and 14 and the rising mirror 30 are arranged at positions that do not block the light beam even when the objective lenses 7 and 14 are lowered to the maximum value of the movable range B. Prevents bad recording / playback performance.
- the beam diameter C is expressed by the above equation (1), where NA is the numerical aperture of the objective lens and f is the focal length. Further, the height H of the entire optical head device is represented by the above formula (2).
- FIG. 10 is an optical system configuration diagram showing the main part of the optical head device when a laser beam having a wavelength of 650 nm is used.
- the raising mirror 30 is moved to the position 30 b facing the objective lens 7 by moving the holding member 31 in the tangential direction by the moving mechanism 33.
- the objective lens 7 is greatly lowered in the direction of the arrow Y in FIG. 10 and moved to the position 7b at the maximum.
- the objective lens 14 is linked to the objective lens 7 and descends to the maximum position 14b.
- the rising mirror 30 is moved to the position 30b facing the objective lens 7 and does not exist under the objective lens 14.
- the object lens 14 and the raising mirror 30 do not collide. Accordingly, the height H of the optical head device can be reduced, and the optical head device and the disk recording / reproducing device can be made thinner.
- the moving mechanism for moving the rising mirror 30 is provided in the optical head device including the plurality of objective lenses 7 and 14. 33, the height of the entire optical head device in which the objective lens 14 does not collide with the rising mirror 30 can be reduced, thereby realizing a small and thin optical head device and a disk recording / reproducing device.
- laser light having a wavelength of 650 nm is emitted from the semiconductor laser 1 and collected by the objective lens 7, and laser light having a wavelength of 405 nm is emitted from the semiconductor laser 9 and is objective lens 14. It was condensed by.
- the present invention is not limited to this configuration, and laser light having a wavelength of 405 nm is emitted from the semiconductor laser 1 and condensed by the objective lens 7, and laser light having a wavelength of 650 nm is emitted from the semiconductor laser 9 and is emitted by the objective lens 14. It may be focused, or laser light with a wavelength other than 405 nm and 650 nm may be used! In this case, it is necessary to select the polarizing beam splitters 3 and 11 and the wavelength selective prism 4 that reflect or transmit an appropriate wavelength.
- the moving mechanism 33 moved the raising mirror 30 by a motor such as a DC motor, a stepping motor, or an ultrasonic motor.
- a motor such as a DC motor, a stepping motor, or an ultrasonic motor.
- the present invention is not limited to this configuration, and the raising mirror 30 may be moved by a moving mechanism 33B having a configuration using a piezoelectric element as shown in FIG. In FIG. 20, the moving mechanism 33B is a fixed part.
- a material 60, a piezoelectric element 61, a driving friction member 62, and a moving member 63 are provided.
- the piezoelectric element 61 expands and contracts when a predetermined voltage noise is applied, so that the moving member 63 fitted to the driving friction member 62 fixed to the piezoelectric element 61 moves in the tangential direction.
- the optical head device includes two semiconductor lasers 1 and 9 and two objective lenses 7 and 14.
- the present invention is not limited to this configuration, and includes, for example, one semiconductor laser that emits laser light having one wavelength and two objective lenses, such as a recording / reproducing apparatus for BD and HD-DVD.
- the structure provided may be sufficient.
- either one or both of the semiconductor laser 1 and the semiconductor laser 9 may output laser light having a plurality of wavelengths.
- a semiconductor laser 1A is provided instead of the semiconductor laser 1, and the semiconductor laser 1A outputs two types of laser light having a wavelength of 650 nm and a wavelength of 780 nm, and the objective lens 7 has a wavelength of 650 nm.
- Two types of laser light with a wavelength of 780 nm may be supported.
- the startup mirror 30 has at least a wavelength of 780 nm, a wavelength of 650 nm, and a wavelength of It must be configured to reflect three types of 405 nm laser light.
- the optical head apparatus includes only one semiconductor laser 1B instead of the two semiconductor lasers 1 and 9, and the semiconductor laser 1B has a wavelength of 405 nm, a wavelength of 650 nm, and a wavelength of 780 nm.
- Different types of laser light may be output.
- the collimating lens 10, the polarization beam splitter 11, the detection lens 17, and the light receiving element 18 in the first embodiment shown in FIG. 1 can be omitted, and the optical head device can be further downsized.
- the optical head device can be further downsized.
- a lock mechanism for fixing the rising mirror 30 at a predetermined position may be provided.
- the lock mechanism includes pins 65 and 66 and a lock control circuit 67.
- the raising mirror 30 is located directly below the objective lens 14.
- the pin 66 By moving the pin 66 so as to fit into a hole (not shown) provided in the holding member 31, the position of the rising mirror 30 is fixed directly below the objective lens 14.
- the rising mirror 30 is controlled by fitting the pin 65 into a hole (not shown) provided in the holding member 31. The position of 30 is fixed directly below the objective lens 7.
- the raising mirror 30 is moved to the position 30a or 30b facing the objective lens 14 or 7, even if the optical head device is vibrated, the raising mirror 30 is brought to an accurate position.
- the position of the light spot on the information recording medium 8 is not shifted.
- the startup mirror 30 may be fixed in position by the self-holding property of the drive source 32 in place of the lock mechanism.
- the 1Z4 wavelength plate 6 is provided between the rising mirror 30 and the wavelength selective prism 4.
- the present invention is not limited to this configuration, and the 1Z4 wavelength plate 6 may be provided between the rising mirror 30 and the objective lenses 7 and 14, or when only linear polarization is used, the 1Z4 wavelength plate Except 6, you can use any other configuration! /.
- the light beam may be configured to be incident from the right side of the force incident from the left side of the drawing.
- the beam diameters of the light beams incident on the objective lenses 7 and 14 are substantially the same. Actually, depending on the specifications of the objective lenses. Needless to say different.
- FIG. 13 is an optical system configuration diagram showing the main part of the optical head device according to the second embodiment when a laser beam having a wavelength of 405 nm is used.
- the optical head device according to the present embodiment is different from the objective lenses 7 and 14 in the tangential direction, in that they are arranged in the radial direction, and the rising mirror 30 and the holding member. 31, instead of the drive source 32 and the moving mechanism 33, the first embodiment shown in FIGS. 1 to 10 is provided in that a raising mirror 30A, a holding member 31A, a drive source 32A, and a moving mechanism 33A are provided.
- the optical head device according to the present embodiment is the same as the optical head device according to the first embodiment, and is configured with the same reference numerals. A detailed description of the elements is omitted.
- the raising mirror 30A is held by the holding member 31A, and the holding member 31A is moved in the radial direction by the drive source 32A and the moving mechanism 33A.
- the holding member 31A is moved to a position 30a facing the objective lens 14.
- the laser beam with a wavelength of 405 nm output from the semiconductor laser 9 (see Fig. 2) is incident on the rising mirror 30A from vertically above the paper surface, reflected in the direction of the objective lens 14, and condensed by the objective lens 14.
- a light spot is formed on the information recording medium 8.
- FIG. 14 is an optical system configuration diagram showing the main part of the optical head device according to the present embodiment when laser light having a wavelength of 650 nm is used.
- the holding member 31A is moved to a position 30b facing the objective lens 7 by the drive source 32A and the moving mechanism 33A.
- the laser beam with a wavelength of 650 nm output from the semiconductor laser 1 is incident on the rising mirror 30A by a vertical upward force on the paper surface, reflected in the direction of the objective lens 7, and condensed by the objective lens 7.
- the optical head device of the present embodiment when the objective lens 7 is used in the configuration in which the objective lenses 7 and 14 are arranged in the radial direction, the objective lens 7 is used. Even if the lens is moved to the position 7b in the focus direction, the collision between the objective lens 14 and the start-up mirror 30A can be avoided, the optical head device can be made thinner, and multiple objective lenses can be arranged in the radial direction. By doing so, the size can be reduced in the tangential direction.
- the optical head device includes a force including two objective lenses 7 and 14, for example, three or more objective lenses 7, 14, and 44 as shown in FIG.
- a semiconductor laser 1C that outputs laser beams having a plurality of wavelengths may be provided instead of the semiconductor lasers 1 and 9.
- the objective lenses 7, 14, and 44 may be arranged in a line in the tangential direction or the radial direction, or may be arranged on any same plane.
- the moving mechanism 33 or 33A can move the raising mirror 30 or 30A by two-axis movement. Another configuration is possible in which the raising mirror 30 or 30A can be moved to an arbitrary position.
- the raising mirror 30 or 30A may be moved in the focus direction of the objective lenses 7, 14, and 44. .
- FIG. 16 is an optical system configuration diagram showing a main part when a laser beam having a wavelength of 650 nm is used in the optical head device according to the third embodiment.
- the optical head device according to the present embodiment is different from the optical head device according to the first embodiment shown in FIGS. 1 to 10 in that a prism 45 is provided instead of the rising mirror 30.
- the optical head device according to the present embodiment is the same as the optical head device according to the first embodiment, and a detailed description of the components denoted by the same reference numerals is omitted.
- FIG. 29 is an optical system configuration diagram showing a main part of the optical head device when two prisms are arranged side by side in the tangential direction.
- multiple rising mirrors for example, as shown in FIG. 27, the transmitted light of the first rising mirror can be guided to the second rising mirror, but multiple prisms are used.
- it is difficult to arrange two prisms side by side as shown in FIG. If the working distance of the objective lens 7 is large even if the objective lens 7 is arranged as shown in FIG. 29, the objective lens 14 and the prism 45 can collide as in the optical head device according to the prior art shown in FIG. There is sex.
- the prism 45 is held by the holding member 31, and the holding member 31 is moved in the tangential direction by the drive source 32 and the moving mechanism 33.
- the holding member 31 is moved to a position 45 a facing the objective lens 14.
- Laser light having a wavelength of 405 nm output from the semiconductor laser 9 (see FIG. 2) is incident on the prism 45, and its direction is changed by internal reflection of the exit surface.
- the laser light emitted from the prism 45 is condensed by the objective lens 14 to form a light spot on the information recording medium 8.
- FIG. 17 is a diagram showing an optical system configuration diagram of a main part when a laser beam having a wavelength of 650 nm is used in the optical head device according to the present embodiment.
- the holding member 31 when using a laser beam having a wavelength of 650 nm, the holding member 31 is moved to a position 45 b facing the objective lens 7.
- Laser light having a wavelength of 650 nm output from the semiconductor laser 1 (see FIG. 2) is incident on the prism 45, and the direction is changed by internal reflection of the emission surface.
- the laser light emitted from the prism 45 is condensed by the objective lens 7 to form a light spot on the information recording medium 8.
- the optical head device can be thinned.
- the prism 45 is used as a means for reflecting the light beam and the moving mechanism 33 for moving the prism 45 is provided, the rising mirror of the optical head device according to the first embodiment is used.
- the beam diameter can be reduced, the inclination of the surface of the prism 45 on the side facing the objective lens 7 can be made smaller than the inclination of the rising mirror 30 of the optical head device according to the first embodiment.
- the height of the entire optical head device can be further reduced.
- the prism 45 is used as a means for reflecting the light beam, so that a smaller and thinner optical head device and a disk recording / reproducing device can be used. Can be realized.
- the objective lenses 7 and 14 are arranged in the tangential direction, and the prism 45 is moved in the tangential direction by the moving mechanism 33.
- the present invention is not limited to this configuration, and the objective lenses 7 and 14 may be arranged in the radial direction, and the prism 45 may be moved in the radial direction by the moving mechanism 33.
- the optical head device can be thinned and the optical head device can be miniaturized in the tangential direction.
- FIG. 18 is an optical system configuration diagram showing a main part when a laser beam having a wavelength of 405 nm is used in the optical head device according to the fourth embodiment.
- the optical head device according to the present embodiment includes two rising mirrors 90 and 91 instead of the rising mirror 30.
- the optical head device differs from the optical head device according to the first embodiment shown in FIGS. 1 to 10 in that it includes a mirror rotation control circuit 94 that rotates the raised mirrors 90 and 91. .
- the rising mirrors 90 and 91 are controlled by the mirror rotation control circuit 94 so as to rotate about the rotation axes 92 and 93, respectively.
- the optical head device according to the present embodiment is the same as the optical head device according to the first embodiment, and a detailed description of the components denoted by the same reference numerals is omitted.
- the mirror rotation control circuit 94 controls the rising mirror 90 horizontally and tilts the rising mirror 91 to a predetermined angle to raise the rising mirror 91. Is made to face the objective lens 14.
- the laser beam having a wavelength of 405 nm output from the semiconductor laser 9 is reflected by the rising mirror 91 to change its direction.
- the laser beam reflected by the rising mirror 91 is collected by the objective lens 14 to form a light spot on the information recording medium 8.
- FIG. 19 is an optical system configuration diagram showing a main part when a laser beam having a wavelength of 650 nm is used in the optical head device according to the fourth embodiment.
- the mirror rotation control circuit 94 controls the rising mirror 91 horizontally by tilting the rising mirror 90 to a predetermined angle so that the rising mirror 90 faces the objective lens 7. To do.
- the laser beam having a wavelength of 650 nm output from the semiconductor laser 1 (see FIG. 2) is reflected by the rising mirror 90 and changed in direction.
- the laser light reflected by the rising mirror 90 is collected by the objective lens 7 to form a light spot on the information recording medium 8.
- the optical head device including the two raising mirrors 90 and 91 includes the mirror rotation control circuit 94 for rotating the raising mirrors 90 and 91, the objective lens In use of 7, the rising mirror 91 located under the objective lens 14 is controlled horizontally, and the collision between the objective lens 14 and the raising mirror 91 can be prevented. As a result, the overall height of the optical head device can be reduced.
- a small and thin optical device is provided by including the mirror rotation control circuit 94 for rotating the rising mirrors 90 and 91.
- a head device and a disk recording / reproducing device can be realized.
- the mirror rotation control circuit 94 includes the rising mirrors 90 and 91. Both were turned.
- the present invention is not limited to this configuration, and the raising mirror 90 may be fixed at a predetermined angle, and only the raising mirror 91 having a high possibility of collision may be controlled to rotate.
- FIG. 22 is an optical system configuration diagram showing the main part of the optical head device according to the fifth embodiment.
- the optical head device according to the present embodiment is different from the first embodiment shown in FIGS. 1 to 10 in that two rising mirrors 80 and 81 are provided instead of the rising mirror 30. This is different from the optical head device.
- the optical head device according to the present embodiment is the same as the optical head device according to the first embodiment, and a detailed description of the components having the same reference numerals is omitted.
- the raising mirror 80 is held by the holding member 82, and the raising mirror 81 is held by the holding member 83.
- the holding members 82 and 83 are arranged such that when the rising mirror 80 is at a position 80a facing the object lens 7, the rising mirror 81 is at a position 81b not facing the objective lens 14, and the rising mirror 81 is When in the position 81a facing the objective lens 14, hold the rising mirrors 80 and 81 at a predetermined interval so that the rising mirror 80 is in the position 80b not facing the objective lens 7 and move the drive source 32 and move.
- the mechanism 33 is moved in the tangential direction in conjunction with each other.
- the holding members 82 and 83 are located at a position 81 a where the rising mirror 81 faces the objective lens 14, and from a position 80 a where the raising mirror 80 faces the objective lens 7. In FIG. 22, it is moved so as to be positioned at a position 80b shifted to the left by the offset distance.
- the position of each raised mirror in this case is indicated by a two-dot chain line in FIG.
- the laser beam having a wavelength of 405 nm output from the semiconductor laser 9 passes through the rising mirror 80 and is then reflected by the rising mirror 81 to change its direction.
- the laser beam reflected by the rising mirror 81 is transmitted by the objective lens 14.
- the distance between the raising mirror 80 and the objective lens 7 is larger than the distance between the raising mirror 81 and the objective lens 14. Therefore, by setting the offset distance of the rising mirror 80 within a range where the rising mirror 80 and the objective lens 7 do not collide, the collision between the rising mirror 80 and the objective lens 7 can be avoided.
- the holding members 82 and 83 are located at a position 80 a where the rising mirror 80 corresponds to the objective lens 7 and the rising mirror 81 is opposed to the objective lens 14.
- the position is moved to the position 8 lb which is shifted to the right by the offset distance in FIG. 22 from the position 81a.
- the position of each raised mirror in this case is indicated by a solid line in FIG.
- the laser beam having a wavelength of 650 nm output from the semiconductor laser 1 (see FIG. 2) is reflected by the rising mirror 80 to change its direction.
- the laser beam reflected by the rising mirror 80 is collected by the objective lens 7 to form a light spot on the information recording medium 8. Since the raising mirror 81 is moved to the right from the position 81a facing the objective lens 14, the raising mirror 81 and the objective lens 14 do not collide.
- the raising mirrors 80 and 81 are provided with an offset, so that when the objective lens 7 is used, the objective lens 14 is used. And collision with the rising mirror 81 can be prevented. As a result, the overall height of the optical head device can be reduced, and a small and thin optical head device, a disk recording device, a disk reproducing device, and a disk recording / reproducing device can be realized.
- FIG. 23 is an optical system configuration diagram showing the main part of the optical head device according to the fifth embodiment.
- the optical head device according to the present embodiment is different from the first embodiment shown in FIG. 1 to: LO in that it includes a rising mirror 84 and a prism 46 instead of the rising mirror 30. This is different from the optical head device.
- the optical head device according to the present embodiment is the same as the optical head device according to the first embodiment, and a detailed description of the components denoted by the same reference numerals is omitted.
- the raising mirror 84 is held by the holding member 85
- the prism 46 is held by the holding member 47.
- the holding members 85 and 47 are arranged such that when the raising mirror 84 is at the position 84a facing the objective lens 7, the prism 46 is at the position 46b not facing the objective lens 14, and the prism 46 is at the objective lens 14
- the raising mirror 84 and the prism 46 are held at a predetermined interval so that the raising mirror 84 is located at a position 84b that does not face the objective lens 7 when it is at the position 46a facing the driving source 32 and the moving mechanism 33. To move in the tangential direction.
- the holding members 85 and 47 are located at a position 46 a where the prism 46 faces the objective lens 14 and the rising mirror 84 is located at a position 84 a that faces the objective lens 7. It is moved so as to be located at a position 84b that is shifted to the right by the offset distance at 23.
- the positions of the rising mirror 84 and the prism 46 in this case are indicated by a two-dot chain line in FIG.
- the laser beam having a wavelength of 405 ⁇ m output from the semiconductor laser 9 passes through the rising mirror 84 and is then reflected by the prism 46 to change its direction.
- the laser beam reflected by the prism 46 is condensed by the objective lens 14 to form a light spot on the information recording medium 8. At this time, even if the objective lens 14 is lowered in the focus direction, the rising mirror 84 is moved to the right side of the position facing the objective lens 7, so that the rising mirror 84 and the objective lens 7 are not moved. There is no collision.
- the holding members 85 and 47 are positioned 46a at which the rising mirror 84 is located at the position 84a corresponding to the objective lens 7 and the prism 46 is opposed to the objective lens 14.
- it is moved so as to be positioned at a position 46b shifted to the left by the offset distance.
- the positions of the rising mirror 84 and the prism 46 in this case are indicated by solid lines in FIG.
- the laser beam having a wavelength of 650 nm output from the semiconductor laser 1 (see FIG. 2) is reflected by the rising mirror 84 to change its direction.
- the laser beam reflected by the rising mirror 84 is collected by the objective lens 7 to form a light spot on the information recording medium 8.
- the prism 46 moves to a position shifted to the left side from the position 46a facing the objective lens 14, so that the prism 46 and the objective lens 14 collide with each other.
- the rising mirror 84 and the prism 46 are offset and provided in a small size without increasing the height of the optical head device.
- a thin optical head device, a disk recording device, a disk reproducing device, and a disk recording / reproducing device can be realized.
- the optical head device includes two objective lenses and one rising mirror 84 and one prism 46 facing each objective lens.
- the present invention is not limited to this, and the optical head device may include three or more objective lenses, and may include two or more rising mirrors and one prism.
- the prism cannot structurally transmit transmitted light to other rising mirrors, so the prism needs to be arranged corresponding to the objective lens that is farthest from the light source.
- the present invention is not limited to this, and the rising mirror 30
- the optical system may be configured so that two wavelength lights (one wavelength light may have a plurality of wavelengths) are incident from both the left and right directions.
- the 1Z4 wavelength plate 6 is not provided immediately below the objective lens 7 (or 14).
- the present invention is not limited to this, and the objective lens 7 ( Alternatively, it may be provided immediately under 14).
- the optical head device is mounted on a disk recording / reproducing device.
- the present invention is not limited to this, and a disk-shaped information recording device is used instead of the disk recording / reproducing device. It may be mounted on a disk recording apparatus that records information signals on a medium or a disk reproducing apparatus that reproduces information signals on a disk-shaped information recording medium.
- the optical head device and the disk recording device, the disk reproducing device, and the disk recording / reproducing device including the optical head device according to the present invention a transfer for moving the beam direction changing means is performed. Since the moving mechanism is provided, a small and thin optical head device and a disk recording device, a disk reproducing device, and a disk recording / reproducing device including the same can be realized.
- An optical head device according to the present invention and a disk recording device, a disk reproducing device, and a disk recording / reproducing device including the optical head device for example, record information on a disk-shaped information recording medium such as a CD, DVD, BD, and HD-DVD. It can be used for disc recording / reproducing apparatus for recording and reproducing information recording medium power information.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800359179A CN101278345B (zh) | 2005-09-30 | 2006-10-02 | 光学头装置 |
JP2007537757A JP5065035B2 (ja) | 2005-09-30 | 2006-10-02 | 光学ヘッド装置 |
US12/088,555 US8130624B2 (en) | 2005-09-30 | 2006-10-02 | Optical head device for forming light spot on disc-shaped information medium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005288109 | 2005-09-30 | ||
JP2005-288109 | 2005-09-30 |
Publications (1)
Publication Number | Publication Date |
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WO2007037479A1 true WO2007037479A1 (ja) | 2007-04-05 |
Family
ID=37899892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/319701 WO2007037479A1 (ja) | 2005-09-30 | 2006-10-02 | 光学ヘッド装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8130624B2 (ja) |
JP (1) | JP5065035B2 (ja) |
CN (1) | CN101278345B (ja) |
WO (1) | WO2007037479A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009140550A (ja) * | 2007-12-05 | 2009-06-25 | Panasonic Corp | レンズ駆動装置、光ピックアップ装置及び光ディスク装置 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007037479A1 (ja) * | 2005-09-30 | 2007-04-05 | Matsushita Electric Industrial Co., Ltd. | 光学ヘッド装置 |
US20100208571A1 (en) * | 2009-02-16 | 2010-08-19 | Panasonic Corporation | Optical Pickup Apparatus and Optical Disk Apparatus Using the Same |
US20110002216A1 (en) * | 2009-06-11 | 2011-01-06 | Panasonic Corporation | Optical pickup device and optical disc device |
JP4834168B2 (ja) * | 2009-06-24 | 2011-12-14 | パナソニック株式会社 | 光ピックアップ装置 |
JP5306261B2 (ja) * | 2010-02-26 | 2013-10-02 | 三菱電機株式会社 | 光ピックアップ装置および光ディスク装置 |
Citations (6)
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JPH0917005A (ja) * | 1995-06-27 | 1997-01-17 | Sharp Corp | 光ピックアップ |
JPH09120559A (ja) * | 1995-10-24 | 1997-05-06 | Ricoh Co Ltd | 光学ヘッド装置 |
JPH09120561A (ja) * | 1994-12-26 | 1997-05-06 | Toshiba Corp | 対物レンズ駆動装置 |
JPH09198704A (ja) * | 1996-01-11 | 1997-07-31 | Toshiba Corp | 光ヘッド装置のレンズ切替機構 |
JPH09265634A (ja) * | 1996-03-27 | 1997-10-07 | Seiko Epson Corp | 光ピックアップ装置 |
JP2005353261A (ja) * | 2004-05-10 | 2005-12-22 | Konica Minolta Opto Inc | 光ピックアップ装置 |
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EP0720158B1 (en) | 1994-12-26 | 1999-10-13 | Kabushiki Kaisha Toshiba | Diaphragm device for objective lens drive |
JPH11120587A (ja) | 1997-10-17 | 1999-04-30 | Sony Corp | 光ピックアップ装置 |
US6343341B1 (en) * | 1999-08-20 | 2002-01-29 | Microsoft Corporation | Efficient access to variable-length data on a sequential access storage medium |
WO2002091370A1 (fr) * | 2001-05-08 | 2002-11-14 | Fujitsu Limited | Dispositif optique et appareil d'enregistrement et/ou de reproduction d'information comprenant ce dernier |
TW200540857A (en) | 2004-05-10 | 2005-12-16 | Konica Minolta Opto Inc | Optical pickup apparatus |
WO2007037479A1 (ja) * | 2005-09-30 | 2007-04-05 | Matsushita Electric Industrial Co., Ltd. | 光学ヘッド装置 |
-
2006
- 2006-10-02 WO PCT/JP2006/319701 patent/WO2007037479A1/ja active Application Filing
- 2006-10-02 JP JP2007537757A patent/JP5065035B2/ja not_active Expired - Fee Related
- 2006-10-02 US US12/088,555 patent/US8130624B2/en not_active Expired - Fee Related
- 2006-10-02 CN CN2006800359179A patent/CN101278345B/zh not_active Expired - Fee Related
Patent Citations (6)
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JPH09120561A (ja) * | 1994-12-26 | 1997-05-06 | Toshiba Corp | 対物レンズ駆動装置 |
JPH0917005A (ja) * | 1995-06-27 | 1997-01-17 | Sharp Corp | 光ピックアップ |
JPH09120559A (ja) * | 1995-10-24 | 1997-05-06 | Ricoh Co Ltd | 光学ヘッド装置 |
JPH09198704A (ja) * | 1996-01-11 | 1997-07-31 | Toshiba Corp | 光ヘッド装置のレンズ切替機構 |
JPH09265634A (ja) * | 1996-03-27 | 1997-10-07 | Seiko Epson Corp | 光ピックアップ装置 |
JP2005353261A (ja) * | 2004-05-10 | 2005-12-22 | Konica Minolta Opto Inc | 光ピックアップ装置 |
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JP2009140550A (ja) * | 2007-12-05 | 2009-06-25 | Panasonic Corp | レンズ駆動装置、光ピックアップ装置及び光ディスク装置 |
Also Published As
Publication number | Publication date |
---|---|
US8130624B2 (en) | 2012-03-06 |
JP5065035B2 (ja) | 2012-10-31 |
CN101278345A (zh) | 2008-10-01 |
US20090201789A1 (en) | 2009-08-13 |
JPWO2007037479A1 (ja) | 2009-04-16 |
CN101278345B (zh) | 2010-09-29 |
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