WO2005109419A1 - 光ピックアップの調整装置および調整方法 - Google Patents
光ピックアップの調整装置および調整方法 Download PDFInfo
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- WO2005109419A1 WO2005109419A1 PCT/JP2005/009003 JP2005009003W WO2005109419A1 WO 2005109419 A1 WO2005109419 A1 WO 2005109419A1 JP 2005009003 W JP2005009003 W JP 2005009003W WO 2005109419 A1 WO2005109419 A1 WO 2005109419A1
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- laser light
- optical axis
- optical pickup
- optical
- light
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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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
Definitions
- the present invention relates to an optical pickup adjustment device used for adjusting the inclination of an objective lens mounted on an optical pickup and an optical pickup adjustment method for adjusting the inclination of the objective lens.
- optical disk An optical pickup is incorporated in an optical disk device or the like, and records or reproduces information on a recording medium such as an optical disk (hereinafter, simply referred to as “optical disk”).
- the optical disk is ideally adjusted so that the optical disk has a posture perpendicular to the optical axis of the laser light emitted from the objective lens.
- the occurrence of so-called coma aberration is suppressed, and the accuracy of recording or reproducing information on the optical disc is improved. It is also possible to correct the astigmatism component contained in the laser beam transmitted through the objective lens by tilting the objective lens, thereby improving the accuracy of recording or reproducing information on the optical disk.
- the tilt of the objective lens of the optical pickup is adjusted by observing a laser beam emitted through the objective lens of the optical pickup by an observation device and based on the observation result.
- an adjustment device for an optical pickup used in the process of adjusting the tilt of the objective lens of the optical pickup an adjustment using an interferometer as an observation device as disclosed in Japanese Patent Application Laid-Open No. H10-9-1968. There is a device.
- a simulated member having optical characteristics equivalent to that of an optical disk is irradiated with laser light via an objective lens, and the laser light transmitted through the simulated member is guided to the interferometer.
- the laser light guided into the interferometer is split by the beam splitter, guided to two different optical paths, then combined again to form interference fringes, and received by one CCD image sensor.
- the video signal from this CCD image sensor is Input to the computer device.
- the computer generates interference fringe data from the video signal, analyzes the data, and displays the interference fringes and the analysis result on a monitor. Then, the operator adjusts the inclination of the objective lens based on the number of interference fringes displayed on the monitor, the degree of bending, and the analysis result so that these are in a predetermined state.
- a spot analyzer as disclosed in Japanese Patent Application Laid-Open No. 2001-273643 was used as an optical pickup adjustment device using an observation device different from the adjustment device using the interferometer.
- an optical spot formed on a simulated member having optical characteristics equivalent to that of an optical disk via an objective lens is imaged by a microscope, which is a spot analyzer, and a CCD image sensor. It is binarized and displayed on the monitor. Then, the operator visually determines the roundness of the zero-order light image and the uniformity of the ring-shaped image due to the first-order diffracted light of the light spot displayed on the monitor, and these are brought into a predetermined state.
- the tilt of the objective lens as described above.
- the operator adjusts the inclination of the objective lens provided in the optical pickup based on the observation result of the laser beam by the observation device displayed on the monitor. Operate the adjusting mechanism to adjust the tilt of the objective lens.
- the present invention has been made to address the above-described problem, and an object of the present invention is to suppress the influence of vibration when adjusting the tilt of an objective lens, and to improve the working efficiency of an optical pickup adjustment operation. It is an object of the present invention to provide a possible optical pickup adjustment device.
- the features of the present invention include a housing, a laser light source that is housed in the housing and emits laser light, and a laser light that is housed in the housing and converts the emitted laser light into a parallel light beam.
- An adjusting device for an optical pickup for adjusting the tilt angle of an objective lens comprising: a second collimator for converting laser light emitted from a laser light source and passing through a first collimating lens and an objective lens into a parallel light flux.
- a collimating lens, and an observation device for observing the laser light converted into a parallel light beam by the second collimating lens comprising: a second collimator for converting laser light emitted from a laser light source and passing through a first collimating lens and an objective lens into a parallel light flux.
- a collimating lens, and an observation device for observing the laser light converted into a parallel light beam by the second collimating lens comprising: a second collimator for converting laser light emitted from a laser light source and passing through a first collimating lens and an objective lens into a parallel light flux.
- Focus control beam splitter for extracting a part of the laser light incident on the measuring device, a focus control light receiving element for receiving the laser light extracted by the focus control beam splitter, and a focus control light receiving element Based on the reception of laser light by the element, the laser beam generated by the objective lens is adjusted to eliminate the deviation between the focal position of the laser light by the objective lens and the focal position for accurately entering the laser light into the observation device.
- a focus support control circuit for performing focus servo control of the focus position.
- the focus support control circuit causes the laser light to be accurately incident on the focal position of the laser light by the objective lens and the observation device based on the reception of the laser light by the focus control light receiving element. May be detected, and the result of the detection may be used to drive and control the focus factory built in the optical pickup.
- the optical pickup is provided with a support device including an actuator that displaces the optical pickup in the optical axis direction of the objective lens while supporting the optical pickup. Based on the received light, the deviation between the focal position of the laser beam by the objective lens and the focal position for accurately entering the laser beam into the observation device is detected, and the drive of the actuator inside the support device is controlled based on the detection result. You may make it.
- focus servo control of the objective lens is performed based on a shift between the focus position of the laser light by the objective lens and the focus position for accurately causing the laser light to enter the observation device.
- Laser beam to the observation device And the tilt of the objective lens can be stably adjusted.
- Another feature of the present invention is an optical pickup adjusting device for adjusting the tilt angle of an objective lens in an optical pickup configured as described above, wherein the adjusting device is provided with a first collimator emitted from a laser light source.
- a second collimating lens that converts the laser light passing through the collimating lens and the objective lens into a parallel light beam, an observation device that observes the laser light converted into a parallel light beam by the second collimating lens, and an observation device.
- Beam splitter for controlling the optical axis for extracting a part of the laser beam incident on the device, a light receiving element for controlling the optical axis for receiving the laser beam extracted by the beam splitter for controlling the optical axis, and a light receiving element for controlling the optical axis
- the laser beam is taken into the observation device so that the optical axis of the laser beam taken into the observation device does not deviate from the optical axis of the observation device.
- the optical axis of the laser beam lies in that a one-way service Ichipo control circuit for Sapo controlled in one direction perpendicular to the optical axis.
- the optical pickup has a tracking function that drives the objective lens in one direction in a plane orthogonal to the optical axis of the laser light. Based on the laser light received by the axis control light-receiving element, the deviation between the optical axis of the laser light taken into the observation device and the optical axis of the observation device is detected, and the tracking result is driven based on the detection result. It is good to do so.
- the optical pickup further includes a support device that supports the optical pickup and displaces the optical pickup in one direction within a plane orthogonal to the optical axis.
- the one-way support control circuit includes an optical axis control circuit.
- a deviation between the optical axis of the laser beam taken into the observation device and the optical axis of the observation device is detected, and the detection result is used to drive the actuator inside the support device. You may make it control.
- the objective lens is orthogonal to the optical axis of the laser light based on the deviation between the optical axis of the laser light taken into the observation apparatus and the optical axis of the observation apparatus.
- Support control can be performed in the one direction in the plane.
- the laser beam incident on the observation device can be held at a predetermined position in the same plane, so that the laser beam can be accurately observed and the tilt of the objective lens can be stably performed.
- another feature of the present invention is an optical pickup adjusting device for adjusting an inclination angle of an objective lens in an optical pickup configured as described above, wherein the first collimating lens emitted from a laser light source is provided.
- a two-way servo control circuit for controlling the optical axis of the laser beam in two directions orthogonal to the optical axis.
- the two-way servo control circuit detects a deviation between the optical axis of the laser light taken into the observation device and the optical axis of the observation device based on the reception of the laser light by the light receiving element for controlling the optical axis. It is preferable to drive the tracking factory and the collimating factory based on the detection result.
- the optical pickup includes a support device including two actuators for supporting the optical pickup and displacing the optical pickup in two different directions in a plane orthogonal to the optical axis.
- the deviation between the optical axis of the laser light taken into the observation device and the optical axis of the observation device is detected based on the reception of the laser light by the axis control light-receiving element, and the two results in the support device are detected based on the detection result.
- the drive control may be performed each night.
- the objective lens is orthogonal to the optical axis of the laser light based on the deviation between the optical axis of the laser light taken into the observation apparatus and the optical axis of the observation apparatus.
- the second collimating lens is controlled in a different direction in a plane orthogonal to the optical axis of the laser beam. Therefore, servo control can be performed in two directions. This makes it possible to stably hold the laser light incident on the observation device at a predetermined position in the same plane, Further, the laser beam can be observed with high accuracy, and the tilt of the objective lens can be stably adjusted.
- FIG. 1 is a block diagram schematically showing an entire optical pickup adjustment device according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing an optical pickup used in the optical pickup adjusting device of FIG.
- FIG. 3 is a perspective view showing an optical pickup supporting device used in the optical pickup adjusting device of FIG.
- FIG. 4 is a perspective view showing a simulation member supporting device used in the optical pickup adjusting device of FIG.
- FIG. 5 is a block diagram schematically showing a state in which an angle calibration jig is provided in the optical pickup adjusting device of FIG.
- FIG. 6 is a perspective view showing an angle calibration jig used in the optical pickup adjusting device of FIG.
- FIG. 7 is a perspective view showing a state where an angle calibration jig is arranged on the optical pickup supporting device of FIG.
- FIG. 8 is a perspective view showing another example of the optical pickup supporting device.
- FIG. 9 is a perspective view showing another example of the simulation member supporting device.
- FIG. 10 is a block diagram schematically showing an entire optical pickup adjusting device according to another embodiment of the present invention.
- FIG. 11 is a block diagram schematically showing an entire optical pickup adjusting device according to another embodiment of the present invention.
- FIG. 1 is an overall schematic diagram of an optical pickup adjustment device used to adjust the tilt of an objective lens mounted on the optical pickup.
- the adjusting device includes an optical pickup supporting device 20 on which the optical pickup 10 is mounted, and a simulated member supporting device 30 for supporting a simulated member 31 disposed above the optical pickup 10. I have.
- the optical pickup 10 reproduces a signal recorded on an optical disc such as a CD or a DVD and / or records a signal on the optical disc, and is an object to be adjusted by the optical pickup adjusting device according to the present invention. It is. To briefly explain the optical pickup 10 to be adjusted, the optical pickup 10 is composed of a laser light source 11, a collimating lens 12, and a start-up mounted on the casing 10a, respectively. It is composed of a mirror 13 and an objective lens 14.
- the laser light source 11 emits laser light under the control of a laser drive circuit 102 described later.
- the laser light emitted from the laser light source 11 is converted into a parallel light beam by the collimating lens 12, then reflected by the rising mirror 13, travels toward the objective lens 14, and is transmitted by the objective lens 14. Focus on it.
- the objective lens 14 is elastically supported by a resilient support member 10b (for example, a wire) on a casing 10a by a cantilever or a cantilever.
- the optical pickup 10 is also provided with a focus actuator 15 and a track actuator 16.
- the focus lens 15 moves the objective lens 14 slightly in the direction of the optical axis of the laser beam, in other words, in the direction perpendicular to the plate surface of the optical disk (not shown) in which the optical pickup 10 is used.
- the light spot is accurately formed on the recording surface of the optical disk.
- the focus lens 15 is a predetermined position in the Z-axis direction of the objective lens 14, specifically, a position where aberration is minimized. It is used to hold the objective lens 14 so that the point image is accurately located at the object point position of the collimating lens 41 described later.
- the position where the objective lens 14 is held may be set to a mechanically neutral position of the elastic support member 10b in the illustrated Z-axis direction of the objective lens 14.
- the track actuator 16 moves the objective lens 14 slightly in the track direction (radial direction of the optical disc) of the optical disc (not shown) in which the optical pickup 10 is used, so that the optical spot is formed on the track of the optical disc. It is to follow exactly.
- the track actuator 16 moves the objective lens 14 to a predetermined position in the track direction, that is, the illustrated Y-axis direction (for example, the illustrated Y-axis direction of the objective lens 14). (The mechanically neutral position of the elastic support member 10b).
- the optical pickup 10 also includes tilt adjusting mechanisms 17 and 18.
- the tilt adjusting mechanisms 17 and 18 are provided on the plane perpendicular to the optical axis of the laser beam, in other words, with respect to the plate surface of an optical disk (not shown) on which the optical pickup 10 is used. It consists of a screw mechanism that can adjust the tilt of 4 around two axes.
- the adjusting device of the optical pickup is operated, the inclination around the X-axis and the Y-axis with respect to the XY coordinate plane shown in the drawing, that is, the rotation in the 0x and 0y rotation directions shown in the drawing is adjusted.
- rotation directions ⁇ ⁇ ⁇ ⁇ and 0 y are merely examples, and if the rotation direction is around two mutually orthogonal axes for adjusting the tilt angle of the objective lens 14, the other two axes are used. The direction of rotation may be around.
- the inclination of the objective lens 14 is adjusted by operating the inclination adjusting mechanisms 17 and 18 using a driver tool or the like.
- the bottom surface of the optical pickup 10 is provided with two mounting portions 19a and 19b used when the optical pickup 10 is set in an optical pickup support device 20 described later.
- FIG. 2 shows a specific example of such an optical pickup 10.
- Reference numerals in the figure correspond to the description of the optical pickup 10 described above.
- the mounting portion 19a is formed in the shape of two square pillars protruding in the horizontal direction from one corner of the outer front surface of the casing 10a.
- the casing 10a is formed into two flanges protruding from both ends of the outer rear surface.
- the collimating lens 12 and the tilt angle adjusting mechanism 18 are not shown due to blind spots.
- the optical pickup supporting device 20 is a supporting portion that detachably supports the optical pickup 10 and includes a stage 21 and a moving device 22.
- the stage 21 supporting the backup 10 is shown as a flat plate for simplification of the drawing, and the stage 21 has a pair of support parts 23a for detachably supporting the optical pickup 10. , 23 b are provided.
- the support portions 23a and 23b for supporting the optical pickup 10 extend horizontally from the side surfaces of the stage 21 formed in a rectangular parallelepiped shape.
- the mounting portions 19a, 19b provided on the outer front and rear surfaces of the optical pickup 10 respectively penetrate into these support portions 23a, 23b, and the mounting portions 19a, 19b.
- the optical pickup 10 is fixed on the supporting portions 23a and 23b by sandwiching both ends of the optical pickup 10 with clips or the like.
- the moving device 22 has a moving mechanism that supports the stage 21 and that can displace the stage 21 in three directions and rotate around the two axes.
- the three-axis directions are X, Y, and ⁇ -axis directions in which each pair is orthogonal to each other, as shown in FIG. 1, and the two-axis directions are around the X- and ⁇ -axes shown in FIG. , 0 y rotation direction.
- the moving device 22 is provided with operators 24 to 28 which can manually displace the moving device 22 in the X, ⁇ , Z axis directions and the 0x, 0y rotation directions in this order. It has.
- the stage 21, that is, the optical pickup 10 supported on the stage 21, can be displaced in the corresponding directions.
- the rotation directions of the 0 X and 0 y are set around the X and Y axes.
- the rotation directions of the 0 x and 0 y are not limited to this, and the two rotation directions exist on the XY plane and are orthogonal to each other. As long as the rotation direction is around the axis, the rotation direction may be around the other two axes.
- the simulated member support device 30 is a support device that holds the simulated member 31 and includes a simulated member tilt adjustment mechanism capable of adjusting the tilt of the simulated member 31.
- the simulation member 31 is made of a transparent member such as glass or plastic, and has optical characteristics equivalent to the optical characteristics of the optical disk in which the optical pickup 10 is used.
- an optical disk is made of a polycarbonate material on the front side of a data recording surface formed of a metal thin film or the like, that is, on the light source side of an irradiated laser beam, for protecting the data recording surface from scratches or dust. It has a transparent substrate. For this reason, the laser beam irradiated on the optical disc is transmitted through the transparent substrate and focused on the data recording surface.
- the optical pickup adjusting apparatus is, in practice, provided with a transparent substrate having a thickness equal to the wavefront of the laser light emitted from the objective lens 14 and transmitted through the transparent substrate of the optical disc.
- a simulation member 31 for correcting the wavefront aberration of the laser beam due to the refractive index is required. That is, the simulation member 31 is disposed in place of the optical disk to simulate the optical disk, and is used to obtain a wavefront of the laser light equivalent to the wavefront of the laser light irradiated on the data recording surface of the optical disk.
- the optical disk has properties equivalent to the substrate, specifically, an equivalent thickness and refractive index, that is, an optical path length equivalent to the optical disk.
- the simulated member support device 30 includes a holding plate 32 and a plate support 33.
- the holding plate 32 is formed in a disk shape, and the rotating shaft 34 is passed through and fixed to a through hole provided in a central portion thereof.
- the holding plate 32 is provided with a plurality of through holes penetrating from the top surface to the bottom surface at substantially equal intervals along the circumferential direction.
- the simulated member 31 is attached to each of the other through holes (for example, three through holes) except one of the plurality of through holes in a replaceable state. Have been.
- the plurality of simulated members 31 are a plurality of types of simulated members having different optical characteristics, respectively, corresponding to substrates of optical disks having different optical characteristics.
- one through-hole that is, an opening to which the simulation member 31 is not attached is prepared because a process that does not use the simulation member 31 exists.
- the plate support table 33 supports the holding plate 32 and has a simulated member tilt adjusting mechanism capable of adjusting the tilt of the holding plate 32, and includes a support portion 33a, 33b and a base portion. Consists of 33 c.
- the support portion 33a is formed in a substantially U-shape, and the tip of a pair of upper and lower arms 33a1 and 33a2 extending in the horizontal direction is provided with a rotating shaft of the holding plate 32. Both ends of 34 are supported so as to be rotatable around the axis of the rotating shaft 34. The upper end of the rotating shaft 34 protrudes from the upper arm 33a1, and the upper end of the rotating shaft 34 is used to manually rotate the holding plate 32 around the axis of the rotating shaft 34. A child 35 is provided. The lower surfaces of the bases of the arms 33a1, 33a2 in the support 33a are in contact with the upper end of the support 33b, and the contact surface between the support 33a and the support 33b is formed.
- the cross-sectional shape perpendicular to the Y axis is an arc on the XZ plane.
- the cross section of the contact surface between the support portion 33a and the support portion 33b, which is orthogonal to the X axis, is formed to be linear in the YZ plane.
- the lower surface of the support portion 33a is slidably engaged with the upper surface of the support portion 33b, and the lower surface of the support portion 33a is slidably engaged with the upper surface of the support portion 33b. It is supported so that it can rotate around the Y axis.
- the support portion 33b is provided with an operator 36 for rotating the support portion 33a around the Y axis, that is, in the 0 y direction with respect to the support portion 33b by manual operation. I have.
- the lower surface of the support part 3 3b is in contact with the upper end of the base part 33c, and the cross-sectional shape orthogonal to the X axis of the contact surface between the support part 33b and the base part 33c is arcuate in the YZ plane. It is shaped to be. Further, the contact surface between the support portion 33b and the base portion 33c is formed so that the cross-sectional shape orthogonal to the Y-axis is linear in the XZ plane.
- the lower surface of the support portion 33 b is slidably engaged with the upper surface of the base portion 33 c, and the lower surface of the support portion 33 b is disposed on the upper surface of the base portion 33 c around the X axis. It is supported rotatably.
- the base 33c is provided with an operator 37 for rotating the support 33b around the X-axis, that is, in the 0X direction with respect to the base 33c by manual operation.
- This optical pickup adjusting device irradiates a flat mirror portion 112 provided on an angle calibration jig 110, which will be described later, which is mounted and fixed on the optical pickup support device 20, with laser light.
- a photo collimator 50 for allowing the reflected light at 112 to enter via a 12 wavelength plate 42 and a beam splitter 43.
- the two-wavelength plate 42 is provided to eliminate the polarization dependence of an optical element such as a beam splitter provided in the adjustment device of the optical pickup for the incident laser light.
- the beam splitter 43 is an optical element that transmits a part of the incident laser light in the same direction as the incident direction and reflects another part in the direction perpendicular to the incident direction.
- the auto-collimator 50 is composed of a laser light source 51, a collimating lens 52, a beam splitter 53, a condenser lens 54, and a CCD image sensor 55.
- a tilt angle detection device that receives reflected light from the target object and detects the tilt of the target object with respect to the emitted laser light.
- the laser light emitted from the laser light source 51 is radiated toward the optical pickup supporting device 20 via the collimating lens 52 and the beam splitter 53, and the optical pickup supporting device 20
- the reflected light from the CCD is received by a CCD image sensor 55 as an imager via a beam splitter 53 and a condenser lens 54.
- a monitoring device 56 is connected to the CCD imaging device 55, and a light receiving image by the CCD imaging device 55 is displayed on the monitoring device 56.
- a cross-shaped scale having an intersection as the direction of the optical axis of the laser beam irradiated from the autocollimation 50 to the optical pickup supporting device 20 is displayed.
- the inclination of the stage 21 can be visually observed by displaying the information on the monitor device 56 via the monitor.
- the monitor device 56 is fixed at a position where it is easy for an operator to visually recognize the monitor device 56 by a support member (not shown) of the optical pickup adjustment device. Further, the photo collimator 50 can also detect the inclination of the simulation member 31 with respect to the optical axis of the laser light emitted from the objective lens 14 in the same manner as described above.
- this optical pickup adjusting device uses the laser beam transmitted through the objective lens 14 of the optical pickup 10 mounted and fixed on the optical pickup supporting device 20 for the simulation member 31 and the collimator described above. After passing through a splitting lens 41 and a half-wave plate 42, the light is reflected by a beam splitter 43, and is referred to as a shirt Quarttman sensor 60, a spot analyzer 70, a four-segment photodetector 83, and a two-dimensional position sensor. Sensor (PSD) 93.
- the collimating lens 41 is an optical element that converts the incident laser light into a parallel light beam, and the collimating lens 41 is moved by a collimating lens moving mechanism (not shown) provided in an adjustment device of the optical pickup.
- the collimating lens 41 consists of two types of lenses, high magnification and low magnification.
- the collimating lens 41 of one magnification is exchangeably mounted on the collimating lens moving mechanism according to the purpose of use. Have been.
- the collimating lens 41 is driven by the collimating lens actuator 44 in a direction orthogonal to the driving direction of the track pickup 16 of the optical pickup 10. In (1), it is displaced in the X-axis direction.
- a shirt Quartman sensor 60 On the optical axis of the laser light reflected by the beam splitter 43, a shirt Quartman sensor 60 is provided via beam splitters 45, 46, and 47.
- the beam splitters 45, 46, and 47 transmit a part of the incident laser light in the same direction as the incident direction and transmit the other part in the incident direction, similarly to the beam splitter 43 described above.
- the laser beam reflected by the beam splitter 43 is partially reflected by the beam splitter 45 in a right angle direction, and a part of the reflected light is transmitted through the beam splitters 46 and 47, respectively.
- the laser beam is incident on a shirt Quartman sensor 60 as an observation device.
- the shirt Quarttman sensor 60 is composed of an ND (Neutral Density) filter 61, a lens array 62, and a CCD image sensor 63, and passes through beam splitters 45, 46, and 47.
- This is a wavefront measuring instrument that measures the wavefront aberration of incident laser light.
- the ND filter 61 is an optical filter for appropriately setting the amount of incident laser light.
- the lens array 62 is composed of a plurality of lenses in which lenses smaller than the beam diameter of the incident laser light are arranged in a two-dimensional lattice, and the incident laser light is converted into a CCD image sensor for each lens.
- the CCD image pickup device 63 is an image pickup device that is arranged at a position where laser light is focused by a plurality of lenses constituting the lens array 62 and captures a plurality of point images formed by the plurality of lenses.
- the multiple point images captured by the CCD image sensor 63 are Each displacement from a plurality of point images obtained by a wavefront that does not include aberrations, which is called a nogram, that is, the sine (sine) component of the normal vector of the wavefront of the laser beam on the imaging surface of the CCD imaging device 63
- a plurality of point images captured by the CCD image sensor 63 that is, video signals, are supplied to the image generation device 64.
- the image generating device 64 is controlled by a controller 100 described later to calculate the wavefront shape of the laser light using the video signal output from the CCD image sensor 63 and display the wavefront as a stereoscopic image.
- the stereoscopic image data generated by the image generating device 64 is output to a monitor device 65, and the state of the wavefront of the laser light is displayed as a stereoscopic image by the monitor device 65.
- the amount of aberration can be calculated and displayed on the monitor 65 as numerical data, or the interference fringes can be displayed on the monitor 65 based on the measured and calculated wavefront.
- the monitor 65 is fixed at a position where it is easy for an operator to visually recognize the monitor 65 by a support member (not shown) of the optical pickup adjustment device.
- a spot analyzer 70 is provided on the optical axis of the laser light transmitted through the beam splitter 45.
- the spot analyzer 70 is composed of an ND filter 71, a condenser lens 72 and a CCD image sensor 73, and the laser beam transmitted through the beam splitter 45 (that is, the Of the focal spot of the laser beam by the objective lens 14 in the plane of the X-Y axis as shown in the figure. It is a detector that observes the shape and position.
- the spot analyzer 70 can also detect the inclination angle of the simulation member 31 with respect to the optical axis of the laser light emitted from the objective lens 14. Further, the functions of the condenser lens 54 and the CCD image sensor 55 of the photo collimator 50 described above can be performed instead.
- the ND filter 71 like the ND filter 61, is an optical filter for appropriately adjusting the amount of incident laser light.
- the condenser lens 72 is an optical lens that condenses the incident laser light on the CCD imaging device 73.
- the CCD image pickup device 73 is an image pickup device that is arranged at a light condensing position of the condenser lens 72 and captures a point image formed by the condenser lens 72.
- a monitoring device 74 is connected to the CCD image sensor 73, and the CCD image sensor 73
- the received light image by 73 is displayed on the monitor device 74.
- the display screen of the monitor device 74 displays a light receiving range in which the shirt sensor 80, a quadrant photodetector 83 described later, and a two-dimensional position sensor (PSD) 93 can receive laser light.
- PSD two-dimensional position sensor
- a cross-shaped scale with the center position as an intersection is displayed so that the positional relationship between the optical axis of the laser light incident on the shirt Quartman sensor 60 and the center position of the light receiving range can be visually checked. I'm familiar.
- the monitor device 74 determines whether the focal position of the laser beam by the objective lens 14 and the laser beam to be accurately incident on the shirt Quartman sensor 60.
- the direction in which the simulated member 31 is at the maximum inclination angle can be visually observed based on how the ring is interrupted.
- the monitor device 74 is fixed to a position where it is easy for the operator to visually recognize the monitor device by a support member (not shown) of the optical pickup adjustment device.
- a convex lens 81, a cylindrical lens 82, and a four-segment photodetector 83 are provided on the optical axis of the laser beam reflected by the beam splitter 46, and the laser beam reflected by the beam splitter 46 is provided. That is, a part of the laser beam incident on the shirt Quartman sensor 60 is a light receiving signal A, B, C corresponding to the light receiving amount at the light receiving portions a, b, c, d (not shown) on the four-divided photodetector 83. , D, and output to the focus error signal generation circuit 84.
- the focus error signal generation circuit 84 generates a focus error signal from the light receiving signals A to D output from the four-divided photodetector 83 by an astigmatism method or the like, and outputs the focus error signal to the focus servo control circuit 85.
- the focus servo control circuit 85 is controlled by a controller 100, which will be described later, to generate a focus servo signal based on the focus error signal output from the focus error signal generation circuit 84, and to generate a drive circuit 8. Output to 6.
- the drive circuit 86 displaces the objective lens 14 in the optical axis direction by controlling the drive of a focus function 15 built in the optical pickup 10 to be adjusted in accordance with the focus service signal. . Therefore, the focus servo control of the objective lens 14 is realized by the cooperation of the focus error signal generation circuit 84, the focus servo control circuit 85, and the drive circuit 86.
- An ND filter is placed on the optical axis of the laser beam reflected by the beam splitter 47.
- a two-dimensional position sensor (PSD) 93 is provided via 91 and a convex lens 92.
- the ND filter 91 like the ND filters 71, 61 described above, is an optical filter for appropriately setting the amount of incident laser light.
- the convex lens 92 is an optical lens that focuses incident laser light on a two-dimensional position sensor (PSD) 93.
- the two-dimensional position sensor (PSD) 93 is a device that detects the center of gravity of the two-dimensional received light amount using the surface resistance of the photodiode, and is disposed at the condensing position of the convex lens 92, and is provided by the convex lens 92.
- a light receiving signal indicating the position of the center of gravity of the point image formed on the three-dimensional position sensor (PSD) 93 is output to the position calculating circuit 94.
- the position represented by the received light signal is within a plane orthogonal to the optical axis of the laser light reflected by the beam splitter 47 (that is, the laser light equivalent to the laser light incident on the shirt square Hartmann sensor 60).
- Position ie, the deviation between the optical axis of the shirt Hartmann sensor 60 and the optical axis of the laser beam emitted from the objective lens 14 in the plane of the X-Y axis is shown on the two-dimensional position sensor (PSD) 93. It is a projection.
- the position calculation circuit 94 uses the light receiving signal output from the two-dimensional position sensor (PSD) 93 to calculate the center position of the light receiving range in which the shirt Quartman sensor 60 can receive laser light and the shirt Quartman.
- the displacement of the laser beam incident on the sensor 60 with respect to the position of the optical axis is calculated in the X-Y-axis plane, and the X-direction error signal and the Y-direction error signal, which represent the same displacement, are calculated as X-Y Output to the directional servo control circuit 95.
- the X—Y direction support control circuit 95 is controlled by a controller 100 described later to generate an X direction support signal and a Y direction servo signal based on the X direction error signal and the Y direction error signal. Then, the signals are output to the drive circuits 96 and 97, respectively.
- the drive circuit 96 displaces the collimating lens 41 in the illustrated X-axis direction by controlling the driving of the collimating lens factory 44 for the collimating lens in accordance with the X-direction servo signal. .
- the drive circuit 97 drives and controls the track function 16 built in the optical pickup 10 to be adjusted in response to the Y-direction servo signal, thereby displacing the objective lens 14 in the Y-axis direction in the figure. Let it.
- the position calculation circuit 94, the X-Y direction servo control circuit 95, Two-way servo control of the collimating lens 41 in the illustrated X-axis direction and the objective lens 14 in the illustrated Y-axis direction is realized by the cooperation of the drive circuits 96 and 97.
- the collimating lens factory 44 is used to displace the optical axis of the laser beam emitted from the objective lens 14 in the X-axis direction via the simulation member 31.
- the controller 100 includes a CPU, a ROM, a RAM, and the like. In response to an instruction from the input device 101, the image generating device 64, the focus servo control circuit 85, the X-Y direction servo control circuit It controls the operation of 95 and the laser drive circuit 102, respectively.
- the input device 101 includes a plurality of push-button switches, and includes an image generation device 64, a focus support control circuit 85, an XY direction support control circuit 95, and a laser drive circuit 102. Instruct the start of each operation.
- the laser drive circuit 102 controls the operation of the laser light source 11 of the optical pickup 10 and the laser light source 51 of the autocollimator 50 in response to an instruction from the controller 100.
- the stage 21 and the simulation member 31 of the optical pickup support device 20 need to be calibrated in advance. .
- the angle calibration process of the stage 21 of the optical pickup support device 20 will be described.
- the operator sets the angle calibration jig 110 on the stage 21 of the optical pickup supporting device 20.
- the angle calibration jig 110 has a plane mirror portion 112 provided on a base 111 made of a rectangular flat plate member.
- the pair of support portions 23a and 23b of the stage 21 described above is composed of two shafts, and is provided on the bottom surface of the base 111.
- a pair of mounting portions 113a and 113b consisting of two parallel grooves are placed on the same shaft and set on the stage 21.
- Plane mirror — Section 1 1 2 is a reflection member used for angle calibration of stage 21, and with base 11 1 placed on stage 21, the normal of the reflection surface is The angle is calibrated so that it is parallel to the optical axis of the lens 60.
- the optical axis of the laser beam emitted from the optical pickup 10 fixed on the stage 21 becomes parallel to the optical axis of the Shack-Hartman sensor 60.
- the operator starts the operation of the optical pickup adjusting device including the controller 100 by turning on a power switch (not shown).
- the operator rotates the holding plate 32 by operating the operator 35 of the simulated member support device 30 so that the simulated member 31 of the holding plate 32 is not attached to one through-hole.
- the hole (opening) is positioned on the optical axis of the laser beam emitted from the photocollimator 50. This is because the laser beam emitted from the autocollimator 50 is irradiated on the plane mirror section 112 without passing through the simulation member 3′1, thereby preventing reflected light from the simulation member 31 from being generated. is there.
- the optical axis of the laser beam emitted from the autocollimator 50 is set in advance so as to coincide with the optical axis of the shirt Quartman sensor 60 via the beam splitter 43.
- the collimating lens 41 is positioned outside the optical path of the ray I light emitted from the autocollimator 50. And move it. This is because the laser light emitted from the auto collimator 50 has already been converted into a parallel light beam by the collimating lens 52 built in the auto collimator 50.
- the operator operates the input device 101 to instruct the controller 100 to emit laser light from the auto collimator 50.
- the controller 100 instructs the laser drive circuit 102 to start operating the laser light source 51 in the autocollimator 50.
- the auto collimator 50 converts the laser light emitted from the laser light source 51 through the collimating lens 52 and the beam splitter 53 into a flat plate mounted on the optical pickup supporting device 20. Light is emitted toward the plane mirror section 1 1 2.
- the laser light emitted from the auto collimator 50 passes through a single through-hole (opening) to which the beam splitter 43 and the simulated member 31 of the holding plate 32 are not attached, and the flat mirror is formed. Partially irradiated to 1 1 and 2.
- the laser beam applied to the plane mirror section 112 is reflected by the reflection surface of the plane mirror section 112, and the simulated member 31 of the holding plate 32 is not attached again.
- the light passes through one through hole (opening) and the beam splitter 43 and enters the photo collimator 50.
- the reflected light incident on the auto collimator 50 enters the condenser lens 54 via the beam splitter 53, and the condenser lens 54 forms the incident reflected light on the CCD image sensor 55.
- a video signal representing the reflected light imaged on the CCD image pickup device 55 is input to a monitor device 56, which displays the angle of the reflected light on the XY plane as a point image. I do.
- the operator operates the optical pickup support device 20 based on the display of the monitor device 56 so that the position of the point image is located at the intersection of the cross-shaped scale displayed on the monitor device 56.
- the tilts of the stage 21 in the illustrated 0 y rotation direction are adjusted by operating the operators 27 and 28 for adjusting the illustrated 0 x and 0 y rotation directions.
- the rotation directions of 0x and 0 are set to around the Y axis.
- the rotation directions of 0x and 0y are not limited to this, and exist in the XY plane and are orthogonal to each other. As long as the rotation direction is around the axis, the rotation direction may be around the other two axes.
- a pair of support portions 23a and 23b (two shafts) of the stage 21 of the optical pickup support device 20 are arranged with respect to the optical axis of the laser light emitted from the autocollimator 50.
- the inclination of stage 21 is adjusted so that the upper bus is vertical.
- the operator operates the input device 101 to stop the emission of the laser beam from the autocollimator 50 and removes the angle calibration jig 110 from the stage 21. .
- the angle calibration process of the stage 21 of the optical pickup supporting device 20 is completed.
- the stage 21 It is possible to easily adjust the tilt in the illustrated 0x, 0y rotation direction.
- the angle calibration step of the simulation member 31 will be described.
- the laser beam emitted from the auto collimator 50 is reflected by the simulation member 31, and the position of the reflected light is displayed on the monitor device 56 to display the simulation member 31.
- This is to adjust the inclination of.
- the operator rotates the holding plate 32 by operating the operator 35 of the simulated member support device 30, and the plurality of simulated members attached to the holding plate 32.
- One of the simulated members 3 1 It is positioned on the optical axis of the laser beam emitted from one collimator 50.
- one simulating member 31 selected from the plurality of simulating members 31 is a simulating member 3 having optical characteristics corresponding to an optical disk in which the optical pickup 10 adjusted by the optical pickup adjusting device is used. Is one.
- the operator operates the input device 101 to instruct the controller 100 to emit laser light from the auto collimator 50.
- the autocollimator 50 emits a laser beam in the same manner as in the angle calibration step of the stage 21 of the optical pickup supporting device 20.
- the laser light emitted from the autocollimator 50 is irradiated on the simulation member 31 via the beam splitter 43.
- a part of the laser beam applied to the simulated member 31 is transmitted through the simulated member 31, and another part is reflected by the simulated member 31, and is again returned to the autocollimator 5 through the beam splitter 43.
- the collimating lens 41 is located outside the optical path of the laser beam emitted from the auto collimator 50.
- the laser beam transmitted through the simulation member 31 is irradiated on the stage 21 of the optical pickup supporting device 20. However, since no flat mirror or the optical pickup 10 exists on the stage 21, There is no reflected light from.
- the auto collimator 50 causes the monitor device 56 to display the angle of the reflected light in the 0-0 direction as a point image based on the received reflected light.
- the operator operates the simulation member holder 30 so that the position of the point image is located at the intersection of the cross scale displayed on the monitor device 56 based on the display of the monitor device 56.
- the inclination of the holding plate 32 that is, the simulation member 31 in the illustrated rotation directions of 0x and 0y is adjusted. Thereby, the inclination of the simulation member 31 is adjusted such that the optical axis of the laser beam emitted from the autocollimator 50 is perpendicular to the simulation member 31.
- the operator operates the input device 101 to stop the emission of the laser beam from the autocollimator 50.
- the angle calibration process of the simulation member 31 is completed. Note that the angle calibration process of the simulation member 31 may be performed as a pre-process of the angle calibration process of the stage 21 of the optical pickup support device 20 described above.
- Optical pickup position The position adjustment step is performed so that the optical axis of the laser light emitted from the optical pickup 10 is positioned at the center of the light receiving range where the shirt Quartman sensor 60 can receive the laser light.
- the focal position of the laser beam emitted from the optical pickup 10 accurately captures the laser beam into the shirt Quartman sensor 60 via the simulation member 31.
- the position of the optical pickup 10 in the illustrated Z-axis direction is adjusted so as to be located at the position. Specifically, it is a point located below the collimating lens 41 (that is, an ideal on-axis object point for minimizing the aberration of the collimating lens 41).
- an operator places and fixes an optical pickup 10 to be adjusted in the optical pickup adjusting device on a stage 21 of an optical pickup support device 20.
- a low-magnification collimating lens 41 is set in a collimating lens moving mechanism (not shown) provided in the optical pickup adjustment device, and the collimating lens is operated by operating the collimating lens moving mechanism. 41 is moved so as to be positioned on the optical path of the laser light emitted from the optical pickup 10.
- the reason why the low-magnification collimating lens 41 is used is to make it easier for the laser light emitted from the optical pickup 10 to enter a light receiving range of a spot analyzer 70 described later.
- a laser drive circuit 102 is connected to the laser light source 11 of the optical pickup 10, and a focus actuator 15 and a track actuator 16 are connected to the drive circuits 86, 96. Connect to each.
- the operator operates the input device 101 to instruct the controller 100 to emit laser light from the optical pickup 10.
- the controller 100 instructs the laser drive circuit 102 to start the operation of the laser light source 11 in the optical pickup 10.
- the optical pickup 10 directs the laser light emitted from the laser light source 11 toward the simulation member 31 via the collimating lens 12, the rising mirror 13 and the objective lens 14. Emit one light.
- the laser light emitted from the optical pickup 10 passes through the simulated member 31, the collimating lens 41, and the beam splitters 43, 45, 46, and 47, respectively, and the spot analyzers 70 and 4 respectively.
- PSD 2D position detector Sensor
- the laser beams received by the shirt Quartman sensor 60, the four-segment photodetector 83, and the two-dimensional position sensor (PSD) 93 are the image generator 64, the focus support control circuit, respectively. Since the operation of the 85 and XY direction servo control circuits 95 has been stopped by the controller 100, respectively, the operation is ignored as a result.
- the spot analyzer 70 focuses the laser light incident from the beam splitter 45 on the CCD image sensor 73 via the ND filter 71 and the condenser lens 72.
- the CCD image sensor 73 outputs a video signal corresponding to the condensed laser light to the monitor device 74, and the monitor device 74 outputs the laser light in the illustrated XY coordinate plane based on the video signal. Is displayed as a point image.
- the focal position of the objective lens 14 is a position where the laser beam is accurately taken into the shirt hearthman sensor 60 via the simulation member 31, that is, a point located below the collimating lens 41 (that is, a collimating lens).
- the operator first adjusts the position of the optical pickup 10 so that the focal position of the objective lens 14 is located at a point located below the collimating lens 41. Specifically, while checking the display on the monitor 74, the operator adjusts the optical pickup support device 20 in the illustrated Z-axis direction so that the unclear image becomes a clear and minimal point image. The operator 26 is operated to adjust the position of the stage 21 in the illustrated Z-axis direction. Accordingly, the point where the focal position of the objective lens 14 is located below the collimating lens 41 (that is, the point at which the aberration of the Object).
- the operator operates the optical pickup supporting device 2 so that the position of the point image is located at the intersection of the cross-shaped scale displayed on the monitor device 74.
- the operator By operating the operators 24 and 25 for adjusting the X and Y axis directions shown in FIG. 0, the position of the stage 21 in the X and Y axis directions shown is adjusted.
- the operator replaces the low-magnification collimating lens 41 set in the collimating lens moving mechanism with a high-magnification collimating lens 41. set.
- the operator 26 for adjusting the illustrated Z-axis direction of the optical pickup support device 20 is operated so that the point image is minimized
- the position adjustment step of the optical pickup ends.
- the operator can operate the X, Y, and ⁇ ⁇ axis direction adjustment operators 24 to 26 while checking the display on the monitor device 74, thereby obtaining an optical pickup.
- the position of 10 in the X, ⁇ , ⁇ axis directions can be easily adjusted.
- the focus lens control start process of the objective lens is a process for accurately and stably controlling the focus lens of the objective lens 14, and is continuously performed from the optical pickup position adjustment process described above. Is what is done.
- the operator operates the input device 101 to instruct the controller 100 to start the focus support control of the objective lens 14.
- the controller 100 starts the operation of the focus servo control circuit 85.
- the laser beam reflected by the beam splitter 46 enters the four-segmented photodetector 83 via the convex lens 81 and the cylindrical lens 82, and the light-receiving parts a, b,
- the signals are converted into light receiving signals A to D corresponding to the light receiving amounts at c and d, and supplied to the focus error signal generating circuit 84.
- the focus error signal is generated by the focus error signal generation circuit 84 based on the received light signals A to D.
- An error signal is generated, and the focus servo control circuit 85 generates a focus servo signal based on the focus error signal and outputs the signal to the drive circuit 86.
- the drive circuit 86 starts drive control of the objective lens 14 according to the focus support signal.
- the operator corrects the position of the objective lens 14 in the illustrated X, ⁇ , and Z axis directions while the objective lens 14 is under focus servo control. More specifically, similarly to the above-described optical pickup position adjustment step, the operating members 24 to 26 for adjusting the X, ⁇ , and Z-axis directions of the optical pickup supporting device 20 are operated to operate the optical pickup 10. Correct the position. This is because the objective lens 14 incorporated in the optical pickup 10 is elastically supported by an elastic supporting member made of a wire or the like. Therefore, when the objective lens 14 is not controlled by the focus support, This is because the elasticity of the elasticity indicating member 10 b in the illustrated Z-axis direction is shifted downward from the dynamic neutral position by the weight of the objective lens 14.
- the position of the optical pickup 10 in the illustrated Z-axis direction is determined and focused by the above-described position adjustment step of the optical pickup.
- the servo control is started, the objective lens 14 is subjected to focus servo control around a position shifted downward from the neutral position. Therefore, the operator operates the operation member 26 for adjusting the Z-axis direction of the optical pickup supporting device 20 so that the position of the optical pickup 10 in the Z-axis direction is adjusted so that the objective lens 14 is in the neutral position.
- the focus servo control of the objective lens 14 is performed around the neutral position by displacing the position downward by an amount deviated from the position. In this case, the amount of deviation of the objective lens 14 from the neutral position is measured in advance, and the operator moves the position of the optical pickup 10 in the illustrated Z-axis direction downward as a predetermined value.
- an annular flat portion is provided on the outer periphery of the objective lens 14, and laser light is irradiated from the autocollimator 50 toward the objective lens 14 including this flat portion. Then, the monitor device 56 displays the reflected light from the flat surface portion.
- the parallel light beam emitted from the auto-collimator 50 is provided. Is irradiated onto the annular flat surface of the objective lens 14, and the reflected light from this flat surface is received by the autocollimator 50.
- a point image is displayed on the monitor device 56 in accordance with the inclination angle of the flat portion, and the operator operates the optical pickup supporting device 2 so that the image is at a predetermined position on the monitor device 56. It is also possible to correct the position of the optical pickup 10 in the illustrated Z-axis direction by operating the operator 26 for adjusting the illustrated Z-axis direction in FIG. Such correction of the position of the optical pickup in the illustrated Z-axis direction is particularly effective when the objective lens 14 is supported by the cantilever with respect to the casing 10 a of the optical pickup 10.
- this condenser lens 48 is used only for the operation of correcting the position of the objective lens 14, the collimator lens moving mechanism (not shown) provided in the optical pick-up adjustment device allows the automatic collimation. It is supported so as to be selectively arranged on or outside the optical path of the laser light emitted from the laser beam at 50. Therefore, when the condenser lens 48 is unnecessary, as shown by the broken line in FIG. 5, the condenser lens 48 should be arranged outside the optical path of the laser beam emitted from the auto collimator 50.
- the monitoring device connected to the spot analyzer 70 While confirming the above-mentioned point image displayed on 74, the X and Y-axis adjustment operators 24 and 25 of the optical pickup supporting device 20 are operated to operate the X and Y axes of the optical pickup 10. Correct the position in the Y-axis direction. As a result, the focus support control of the objective lens 14 is performed accurately and stably, and the focus servo control start step of the objective lens is completed.
- the two-direction servo control start step is a step of starting the servo control of the objective lens 14 in the illustrated Y-axis direction and the start of the servo control of the collimating lens 41 in the illustrated X-axis direction. This is performed continuously from the step of starting the focus support control of the objective lens.
- the operator operates the input device 101 to instruct the controller 100 to start the two-way servo control.
- the controller 100 starts the operation of the XY direction servo control circuit 95.
- the laser light reflected by the beam splitter 47 is The light enters the two-dimensional position sensor (PSD) 93 via the 9 1 and the convex lens 9 2, and is converted by the two-dimensional position sensor (PSD) 9 3 into a light receiving signal representing the position of the center of gravity of the corresponding point image, and the position is calculated. Supplied to circuit 94. Then, the position calculation circuit 94 generates an X-direction error signal and a Y-direction error signal based on the received light signal, respectively. The X—Y-direction servo control circuit 95 outputs the X-direction error signal and the Y-direction error signal.
- An X-direction support signal and a Y-direction support signal are generated based on the direction error signal, and output to the drive circuits 96 and 97, respectively.
- the drive circuit 97 starts drive control of the objective lens 14 in the illustrated Y direction according to the Y-direction servo signal. Further, the drive circuit 96 starts the drive control of the collimating lens 41 in the illustrated X direction in accordance with the X-direction servo signal. Accordingly, the servo control of the objective lens 14 in the illustrated Y direction is started, the servo control of the collimating lens 41 in the illustrated X direction is started, and the bidirectional support control start process ends. .
- the operator proceeds to the tilt angle adjustment process of the objective lens.
- the optical axis of the laser beam emitted from the laser light source 11 of the optical pickup 10 through the collimating lens 12 is parallel to the optical axis of the objective lens 14.
- This is a step of adjusting the tilt of the objective lens 14, and is performed continuously from the above-described two-direction servo control start step.
- the operator operates the input device 101 to instruct the controller 100 to start the operation of the image generation device 64.
- the controller 100 starts the operation of the image generating device 64.
- the laser light transmitted through the beam splitter 47 enters the shirt Quartman sensor 60.
- the shirt Hartmann sensor 60 condenses the laser light incident from the beam splitter 47 on the CCD image sensor 63 via the ND filter 61 and the lens array 62. In this case, a plurality of point images are focused on the CCD image sensor 63 by the lens array 62.
- the CCD image sensor 63 outputs a video signal corresponding to the collected laser light to the image generating device 64, and the image generating device 64 calculates the wavefront of the laser light based on the video signal.
- three-dimensional image data to be displayed as a three-dimensional image is generated and output to the monitor device 65.
- the monitor 65 uses the three-dimensional image data to convert the state of the wavefront of the laser light into a three-dimensional image. indicate.
- the tilt angle adjusting mechanism 18 for adjusting the rotation direction of the objective lens 14 is adjusted by operating the mechanism 17 and the tilt angle adjustment mechanism 18 for adjusting the rotation direction of the objective lens 14. In this case, in the process of adjusting the tilt of the objective lens 14 in the rotation direction shown in FIG.
- the optical axis of the laser beam emitted from the optical pickup 10 is adjusted to the If the position is out of the light receiving range, the process returns to the above-described optical pickup position adjusting step, and the operations of the respective steps are performed again from the optical pickup position adjusting step. Thereby, the optical axis of the laser light emitted from the laser light source 11 of the optical pickup 10 via the collimating lens 12 becomes parallel to the optical axis of the objective lens 14.
- the operator When the tilt of the objective lens 14 is adjusted in this way, the operator operates the input device 101 to instruct the controller 100 to the image generation device 64 and the foreground. It instructs the operation of each of the first and second X-Y direction support control circuits 85 and 95 and the laser drive circuit 102 to stop.
- the controller 100 includes an image generation device 64, a focus support control circuit 85, an XY direction support control circuit 95, and a laser drive circuit 100. Stop each operation of. Then, the operator removes the optical pickup 10 from the stage 21 of the optical pickup supporting device 20, and the tilt adjustment process of the objective lens is completed.
- the work may be started from the above-described optical pickup position adjustment step.
- the holding plate 32 is rotated by operating the operator 35 of the simulated member support device 30 to hold the disk.
- the work may be started from the optical pick-up position adjustment process that has been performed.
- the laser beam emitted from the pump 10 is received by the shirt Quartman sensor 60 via the objective lens 14 and the simulation member 31 and the wavefront aberration of the laser beam received by the shirt Quartman sensor 60 is measured.
- the state of the wavefront calculated based on the measured aberration is displayed on the monitor 65.
- the operator adjusts the tilt of the objective lens 14 while checking the state of the wavefront of the laser light displayed on the monitor device 65. Since the wavefront aberration of the laser light is measured independently of the coherence of the laser light, and the wavefront of the laser light is observed independently of the coherence of the laser light, it is affected by the coherence of the laser light.
- the tilt of the objective lens 14 can be adjusted without having to do so. Also, since the wavefront aberration of the laser beam can be measured without using a collimating lens 41 having a high numerical aperture, the inclination of the objective lens 14 must be adjusted without being affected by the numerical aperture of the objective lens 14. Can be.
- the tilt angle of the objective lens 14 is adjusted optimally by the following method.
- a first simulation member having an optical path length longer by a predetermined optical path length than an optical path length corresponding to an optical path length of an optical disk, and a second simulation member having an optical path length shorter by the predetermined optical path length are sequentially exchanged so that the laser light emitted from the optical pickup 10 is taken into the Shack-Hartmann sensor 60.
- the aberrations of the wavefront of the laser beam when the first simulating member and the second simulating member are used are calculated respectively, and the calculated aberrations with respect to the aberration when the tilt angle adjustment of the objective lens 14 is completed. Calculate the amount of change in aberration.
- the tilt angle of the objective lens 14 is optimally adjusted.
- the simulating member 31 may be rotated 0x in the rotation direction and Z or after the tilt angle adjustment of the objective lens 14 is completed.
- both aberrations of the wavefront of the laser beam in the forward and reverse tilted state are calculated, respectively, and by confirming the symmetry of the amount of change in the calculated both aberrations. It is also possible to confirm that the tilt angle of the objective lens 14 is adjusted optimally.
- a plurality of simulated members 31 having different optical characteristics are used.
- the focus error signal generation circuit 84, the force sensor control circuit 85, and the drive circuit 86 perform focus servo control of the objective lens 14, and the position calculation circuit 94, X —
- the Y-direction support control circuit 95 and the drive circuits 96 and 977 perform two-direction support control of the objective lens 14 in the illustrated Y-axis direction and the collimating lens 41 in the illustrated X-axis direction. I did it.
- the focus of the objective lens 14 is always kept at a predetermined focal point. It can be held in position, and the work efficiency can be improved.
- the image generation device 64 calculates the wavefront aberration of the laser beam based on the video signal output from the shirt Quartman sensor 60, and Although the state of the wavefront calculated based on the calculated wavefront aberration is displayed on the monitor device 65, the present invention is not limited to this.
- the image generating device 64 For example, based on the video signal output from the shirt Quarttman sensor 60, the image generating device 64 generates a pseudo interference fringe with or without the wavefront of the laser light, Calculate the difference, coma and spherical aberration, respectively, and with the calculated wavefront stereoscopic image or separately from the wavefront stereoscopic image, pseudo interference fringes, laser beam astigmatism, coma aberration and spherical aberration The value may be displayed on the monitor device 65.
- the adjustment of the stage 21 of the optical pickup support device 20 in the illustrated X, ⁇ , Z axis directions and the illustrated 0x, 0y rotation directions is performed by manually operating the operators 24 to 28 of the moving device 22.
- the present invention is not limited to this.
- the same adjustment can be performed by operating the controller 100 via the input device 101.
- a driving device such as an electric motor is provided in a moving mechanism capable of displacing the stage 21 in three axial directions and rotating around the two axes, respectively.
- the driving device is configured to be controlled by the controller 100.
- the operator operates the input device 101 to specify the position of the stage 21 in the X, ⁇ , Z axis directions and the 0y rotation direction.
- the controller 100 controls the driving of each of the driving devices so that the stage 21 is located at the position indicated by the instruction.
- the displacement of the stage 21 of the optical pickup supporting device 20 in the illustrated 0x, 0y rotational direction is such that the plates 22 e and 22 f of the moving device 22 of the optical pickup supporting device 20 are formed in an arc shape.
- the plates 22e, 22f, and 22g of the moving device 22 may be assembled by a link mechanism. Specifically, plates 22 e, 22 f, and 22 g formed in a flat plate shape are stacked via four tension springs 121 and 122 (one each not shown), and each is in a vertical relationship.
- Plates 22f, 22e and 22e, 22f are connected by four links 123a, 123b, 124a, 124b and links 125a, 125b, 126a, 126b, respectively.
- Links 123b, 124b, 125b and 126b are not shown because they are mounted on the opposite sides of the respective sides of the plates 22e, 22f and 22g to which the links 123a, 124a, 125a and 126a are mounted.
- two links 123a (123b), 124a (124b), 125a (125b), and 126a (126b) are respectively attached in a non-parallel state.
- the link 123a (123b) is installed in a direction parallel to the illustrated Z-axis direction, but the link 124a (124b) is mounted in the illustrated Y-axis direction with respect to the illustrated Z-axis direction. It is installed in an inclined state.
- the link 125a (125b) is installed in a direction parallel to the illustrated Z-axis direction, but the link 126a (126b) is inclined in the illustrated X-axis direction with respect to the illustrated Z-axis direction. Installed in state.
- the plate 22e can be displaced in the rotation direction of the link 126a (126b) with the link 125a (125b) side as a fulcrum
- the plate 22f can be displaced in the link 123a (123b) side.
- the link 124a (124b) side can be displaced in the rotation direction in FIG.
- the plates 22 e and 22 f are always urged downward by the tension springs 121 and 122.
- cylindrical cam followers 127a and 127b are rotatably mounted at the center of the side surfaces of the plates 22e and 22f on the side displaced in the rotation directions 0y and 0x, respectively.
- Cams 128a and 128b are in contact with the circumferential surfaces of the cam followers 127a and 127b, respectively.
- These cams 128a, 128b are connected to motors 129a, 129b via shafts, respectively, and are rotated by the rotation of the motors 129a, 129b, respectively.
- the motors 129a and 129b are respectively connected to control devices (not shown) (for example, the controller 100), and their rotations are controlled.
- the cam followers 127a and 127b are pulled downward by the rotational displacement of the cams 128a and 128b due to the rotation of the motors 129a and 129b, and the plates 22e and 22f are pulled. Due to the elastic force of the springs 121 and 122, they are displaced in the rotation directions of 0 y and ⁇ x shown in the drawing. Thus, the operator can displace the stage 21 in the illustrated 0y, 0X rotation directions by operating the control device.
- the motors 129a and 129b manual controls are attached to the cams 128a and 128b, and the manual operation is performed by the operator as in the above embodiment. 22 e and 22 f, that is, the inclination of the stage 21 may be adjusted. Further, such a moving device 22 can be applied to the simulation member tilt adjusting mechanism of the simulation member support device 20 in the above embodiment.
- the drive circuit 86 and the drive circuit 97 are connected to the focus function 15 and the track function 16 provided in the optical pickup 10, respectively.
- the drive circuit 96 is connected to the collimating lens factory 41 provided in the adjustment device of the above, and the focus servo control of the focal position of the objective lens 14 and the shack Hartman sensor 60 are taken in.
- two-direction servo control in the illustrated X and Y axis directions of the optical axis is performed, the present invention is not limited to this.
- the stage 21 of the optical pickup supporting device 20 may be controlled individually in the X, ⁇ , and Z axis directions. In this case, as shown by the dashed line in FIG.
- the stage 21 is shown in the optical pickup support device 20 in the X, ⁇ , and Z axis directions, respectively.
- Axial actuators 44 and Z-axis actuators 15 are provided.
- These Y-axis actuators 16 ', X-axis actuators 44, and Z-axis actuators 1 and 4 are provided.
- Drive circuits 9 7, 9 6, 8 6 ′ are connected to 5 ′, respectively, and focus servo control of the focal position of the objective lens 14 and the optical axis taken into the shirt-Kartman sensor 60 X, Y Two-way servo control in the axial direction is performed.
- the position calculation circuit 94, the XY direction support control circuit 95 and the drive circuits 96 and 97, the illustrated Y-axis direction and collimating of the objective lens 14 are performed.
- the two-directional servo control in the illustrated X-axis direction of the lens 41 is performed, but the present invention is not limited to this.
- the collimating lens 41 in the X-axis direction Servo control can be omitted.
- a one-dimensional position sensor can be used instead of the two-dimensional position sensor 93, and the position calculation circuit 94 is also a two-dimensional calculation circuit. Can be changed to a one-dimensional calculation circuit.
- the configuration of the adjustment device for the optical pickup can be simplified.
- the optical pickup supporting device 20 capable of displacing the stage 21 in the directions of the X, Y, and ⁇ axes shown and the five axes of the 0 and ⁇ y rotational directions is used.
- the present invention is not limited to this.
- the inclination of the stage 21 of the optical pickup support device 20 and the inclination of the simulation member 31 are adjusted by using one autocollimator 50.
- the present invention is not limited to this. It is not done.
- an autocollimator 50 for adjusting the inclination of the stage 21 of the optical pickup support device 20 and a photocollimator 50 for adjusting the inclination of the simulation member 31 may be provided.
- the CCD imaging elements 55, 63, and 73 are used as light receiving elements incorporated in the auto collimator 50, the shirt Quartman sensor 60, and the spot analyzer 60.
- one or more of the CCD image sensors 55, 63, and 73 may be formed of a light receiving element such as a CMOS image sensor.
- a two-dimensional position sensor PSD may be used instead of the CCD image sensors 55 and 73. In this case, the output of the two-dimensional position sensor (PSD) may be displayed on an oscilloscope.
- the holding plate 32 holding the plurality of simulation members 31 is formed in a disk shape, and the holding plate 32 is operated by rotating the operation element 35 to form one simulation.
- the member 31 is arranged on the optical axis of the laser beam emitted from the optical pickup 10, it is not limited to this.
- the holding plate 32 may be formed in a rectangular shape, and the plurality of simulated members 31 may be held in the longitudinal direction of the rectangular holding plate 32 ′.
- the holding plate 3 2 ′ is displaced in the longitudinal direction of the holding plate 3 2 ′.
- a screw feed mechanism in which a screw rod 38b is screwed to a nut 38a fixed to the lower surface of the holding plate 32 is provided.
- the motor 39 is connected to a control device, for example, a controller 100, and its rotation is controlled.
- the holding plate 32 is displaced in the axial direction of the screw rod 38 b by the rotation drive of the motor 39, and the one simulated member 31 is irradiated with laser light emitted from the optical pickup 10. It is positioned to be placed on the axis.
- an operator for manual operation is provided at one end of the screw rod 38b, and by operating the operator, one simulation member 31 is emitted from the optical pickup 10. May be arranged on the optical axis of the laser beam.
- the holding plate 32 is provided with a plurality of through holes, and the simulation member 31 is attached to the through holes.
- the present invention is not limited to this.
- a plurality of notches may be provided on the outer periphery along the circumferential direction of the holding plate 32, and the simulation member 31 may be attached to these notches.
- the holding plate 32 is rotatably supported by the support portion 33a of the simulation member supporting device 30.
- the present invention is not limited to this.
- the holding plate 32 may be detachably supported by the support portion 33a of the simulation member supporting device 30.
- an interferometer 130 is provided in place of the shirt Quartman sensor 60, and an image generation device 64 is provided.
- the image generation device 140 It should be noted that a focus error signal generation circuit 84, a focus servo control circuit 85, and a drive circuit 86 for controlling the focus lens of the objective lens 14 are provided.
- the configuration may be the same as the form.
- the interferometer 130 includes a half mirror 131a, 131b, a mirror 132a, 132b, a convex lens 133, 134, 135, 136, a pinhole 137, and a CCD image sensor 138, and the beam splitters 45, 46, This is a measuring instrument that measures the interference fringes generated by the optical path difference after guiding the laser light incident through the optical path 47 to two different optical paths, respectively.
- the half mirror 131a is an optical element that transmits part of the incident laser light in the same direction as the incident direction and reflects another part in the direction perpendicular to the incident direction.
- a mirror 132a, a convex lens 133, a pinhole 137, a convex lens 134, and a half mirror 131b are provided on the optical axis of the laser beam transmitted through the half mirror 131a.
- the mirror 132a is a reflector that totally reflects the incident laser light in a direction perpendicular to the incident direction.
- the convex lens 133 is a condenser lens that focuses the laser beam reflected by the mirror 132a on a pinhole 137.
- the pinhole 137 is a small hole (4 to 20 m) provided in the center of the plate surface formed in a flat plate shape. The pinhole 137 condenses the laser light emitted from the convex lens 133 and collects the laser light.
- the convex lens 134 is a relay lens for guiding the laser beam transmitted through the pinhole 137 to the CCD image sensor 138 as reference light via the half mirror 131b.
- the half-mirror 13 lb reflects the laser light emitted from the convex lens 134 at right angles, guides the laser light to the CCD image sensor 138, and transmits the laser light reflected by a mirror 132b described later to transmit the same CCD image.
- Optical element leading to element 138 That is, the laser light emitted from the convex lens 134 and the laser light reflected by the mirror 132b are superimposed and guided to the CCD image sensor 138.
- a convex lens 135 as a capacitor lens, a convex lens 136 as a relay lens, a mirror 132b, and a half mirror 131b are provided on the optical axis of the laser beam reflected by the half mirror 131a.
- the convex lens 135 is an optical lens that guides the laser light reflected by the half mirror 131a.
- the convex lens 136 receives the laser light once condensed by the convex lens 135, and transmits the laser light through the mirror 132b and the half mirror 131b to the CCD image sensor. This is a relay lens for guiding the light to be measured on 1 38.
- the mirror 132b is a reflector that totally reflects the incident laser light in a direction perpendicular to the incident direction, similarly to the mirror 132a. That is, the laser light reflected by the half mirror 131a is guided to the CCD image pickup device 138 without removing its aberration.
- the CCD imager 1338 is an imager that captures interference fringes by superimposing two light beams converted into collimated light beams by the convex lenses 1334 and 1336 by a half mirror 13lb.
- the interference fringe imaged by the CCD image sensor 1338 is obtained by superimposing the laser light from which the aberration has been removed by the pinhole 1337 and the laser light from which the aberration has not been removed without passing through the pinhole 133.
- the interference fringes captured by the CCD image sensor 138 that is, the video signal, are supplied to the image generator 140.
- the I-image generator 140 is controlled by the controller 100 and analyzes the interference fringes of the laser beam based on the video signal output from the CCD image sensor 138 to analyze the amount of aberration and the like. It is a device that calculates results and generates stereoscopic image data of the wavefront.
- the analysis result calculated by the image generating apparatus 140 and the generated image data are output to a monitor 65 together with a video signal, and the monitor 65 generates interference fringes of the laser light and a wavefront of the laser light.
- the stereoscopic image and the analysis result are displayed.
- the operator When using the optical pickup adjustment device using the interferometer 130 as such an observation device, the operator performs the operation up to the inclination adjustment process of the objective lens in the same procedure as in the above embodiment. Then, in the tilt angle adjustment step of the objective lens, the operator checks the state of the interference fringes of the laser light displayed on the monitor device 65, the three-dimensional image of the wavefront of the generated laser light, and the displayed aberration, Operate the tilt adjustment mechanism 17 for adjusting the X rotation direction and the tilt adjustment mechanism 18 for adjusting the Y rotation direction of the optical pickup 10 so that the interference fringes are within the specified standard. Then, the tilt of the objective lens 14 in the illustrated 0x, ⁇ y rotation direction is adjusted.
- a simulation member 31 having necessary optical characteristics is selected from a plurality of simulation members 31 having different optical characteristics. Can be instantly placed on the optical axis of the laser beam emitted from the optical pickup 10 and the autocollimator 50, improving work efficiency. Can be improved.
- a simulation such as the angle calibration process of the stage 21 of the optical pickup supporting device 20 is performed. Even when the member 31 is not required, it can respond quickly.
- the inclination of the holding plate that is, the simulated member 31 in the display 0x, 0y rotation direction
- the inclination of the holding plate that is, the simulated member 31 in the display 0x, 0y rotation direction
- Rate can be improved.
- the focus error signal generation circuit 84, the focus servo control circuit 85, and the drive circuit 86 control the objective lens 14 in focus servo, the position calculation circuit 94, and the X—Y direction support.
- the two-directional support control of the objective lens 14 and the illustrated Y-axis direction of the objective lens 14 and the collimating lens 41 in the illustrated X-axis direction is performed by the one-point control circuit 95 and the drive circuits 96 and 977. .
- the objective lens 14 is always emitted from the objective lens 14 even if the position of the objective lens changes due to the position adjustment of the objective lens 14 in the rotation directions of 0x and ⁇ y in the drawing.
- the point image of the laser beam can be held at a predetermined position, and the working efficiency can be improved.
- a spot analyzer 70 ′ is arranged in place of the shirt Quarttman sensor 60, and an image generation device 65 Instead of this, an image generation device 150 is arranged.
- the spot analyzer 70 in FIG. 1 can be shared by the spot analyzer 70 ′, the spot analyzer 70 and the monitor device 74 are unnecessary. Therefore, a convex lens 81, a cylindrical lens 82, and a four-segment photodetector 83 are provided on the optical axis of the laser beam transmitted through the beam splitter 45, and the four-segment photodetector 83 has a focus.
- the error signal generation circuit 84 is connected.
- An ND filter 91, a convex lens 92, and a two-dimensional position sensor 93 are provided on the optical axis of the laser beam reflected by the beam splitter 46, and a two-dimensional position sensor is provided.
- the position sensor 93 is connected to a position calculation circuit 94.
- a spot analyzer 70 ′ is provided on the optical axis of the laser beam transmitted through the beam splitter 46, and an image generator 150 is connected to the spot analyzer 70 ′. ing.
- the spot analyzer 70 ′ has the same configuration as the spot analyzer 70 in the above embodiment, and a description thereof will be omitted. That is, the ND filter 71 corresponds to the ND filter 7 1 ′, the condenser lens 72 corresponds to the condenser lens 7 2 ′, and the CCD image sensor 73 has the CCD image sensor 73 3 ′. It corresponds to.
- the image generating device 150 is controlled by the controller 100 and uses the video signal output from the CCD image sensor 138 to change the spot shape of the laser beam to the 0th-order light image and the 1st-order diffracted light. This is a device for generating an image data to be displayed as a ring-shaped image according to.
- the image data generated by the image generating device 150 is output to a monitor device 65, and the monitor device 65 changes the spot shape of the laser beam into a ring shape by the zero-order light image and the first-order diffracted light. Displayed as an image.
- the operator When using the optical pickup adjustment device using the spot analyzer 70 'as such an observation device, the operator performs the operation up to the objective lens tilt angle adjustment process in the same procedure as in the above embodiment. Then, in the step of adjusting the tilt angle of the objective lens, the operator checks the 0-order light image and the ring image of the laser light displayed on the monitor device 65 while the 0-order light image and the ring image have predetermined shapes. As described above, the tilt angle adjusting mechanism 17 for adjusting the X rotation direction and the tilt angle adjusting mechanism 18 for adjusting the rotation direction of the optical pickup 10 shown in FIG. y Adjust the tilt in the rotation direction.
- one of the plurality of simulated members 31 is also used.
- One through-hole (opening) that does not have the simulated member 31 in addition to the plurality of simulated members 31, controls the focus of the objective lens 14, and controls the focus of the objective lens 14.
- Illustrated X-axis direction and collimating lens 41 Illustrated 2-axis direction servo control in the Y-axis direction improves the tilt adjustment accuracy of the objective lens and improves work efficiency
- a heart man constituted by a plurality of circular apertures and an image sensor arranged at the focal position of the convex lens and the convex lens is used.
- a sensor may be used as an observation device.
Landscapes
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Abstract
Description
Claims
Priority Applications (1)
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JP2006513060A JP4692483B2 (ja) | 2004-05-12 | 2005-05-11 | 光ピックアップの調整装置 |
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JP2004142807 | 2004-05-12 | ||
JP2004-142807 | 2004-05-12 |
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WO2005109419A1 true WO2005109419A1 (ja) | 2005-11-17 |
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Family Applications (2)
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PCT/JP2005/009012 WO2005109420A1 (ja) | 2004-05-12 | 2005-05-11 | 光ピックアップの調整装置および調整方法 |
PCT/JP2005/009003 WO2005109419A1 (ja) | 2004-05-12 | 2005-05-11 | 光ピックアップの調整装置および調整方法 |
Family Applications Before (1)
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PCT/JP2005/009012 WO2005109420A1 (ja) | 2004-05-12 | 2005-05-11 | 光ピックアップの調整装置および調整方法 |
Country Status (3)
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JP (2) | JP4692483B2 (ja) |
CN (2) | CN100446099C (ja) |
WO (2) | WO2005109420A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5241093B2 (ja) * | 2006-11-01 | 2013-07-17 | キヤノン株式会社 | 光ヘッド調整方法 |
JP2010102745A (ja) * | 2008-10-21 | 2010-05-06 | Pulstec Industrial Co Ltd | レーザ光の波面収差測定方法 |
CN103645034B (zh) * | 2013-11-28 | 2016-06-01 | 上海华力微电子有限公司 | 集成光学透镜检测器 |
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- 2005-05-11 CN CNB2005800061184A patent/CN100446099C/zh not_active Expired - Fee Related
- 2005-05-11 WO PCT/JP2005/009003 patent/WO2005109419A1/ja active Application Filing
- 2005-05-11 JP JP2006513060A patent/JP4692483B2/ja not_active Expired - Fee Related
- 2005-05-11 JP JP2006513062A patent/JP4692484B2/ja not_active Expired - Fee Related
- 2005-05-11 CN CNB200580006117XA patent/CN100440344C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
JP4692484B2 (ja) | 2011-06-01 |
JPWO2005109420A1 (ja) | 2008-03-21 |
CN1934634A (zh) | 2007-03-21 |
JP4692483B2 (ja) | 2011-06-01 |
CN1934633A (zh) | 2007-03-21 |
JPWO2005109419A1 (ja) | 2008-03-21 |
CN100446099C (zh) | 2008-12-24 |
WO2005109420A1 (ja) | 2005-11-17 |
CN100440344C (zh) | 2008-12-03 |
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