WO2006030818A1 - フォーカス引込方法および光ディスク装置 - Google Patents
フォーカス引込方法および光ディスク装置 Download PDFInfo
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- WO2006030818A1 WO2006030818A1 PCT/JP2005/016919 JP2005016919W WO2006030818A1 WO 2006030818 A1 WO2006030818 A1 WO 2006030818A1 JP 2005016919 W JP2005016919 W JP 2005016919W WO 2006030818 A1 WO2006030818 A1 WO 2006030818A1
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- Prior art keywords
- actuator
- focus
- optical disc
- light
- error signal
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
-
- 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
- G11B7/0945—Methods for initialising servos, start-up sequences
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/121—Protecting the head, e.g. against dust or impact with the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Definitions
- the present invention uses an optical head equipped with light sources that emit a plurality of types of light having different wavelengths, determines the types of a plurality of types of optical discs having different protective layer thicknesses, and executes focus pull-in.
- the present invention relates to an optical disk apparatus equipped with this method.
- BD Blu-ray Disc
- CDs compact discs
- DVDs digital versatile discs
- Patent Document 1 the objective lens of the optical pickup is switched to the CD objective lens to detect the amplitude value of the focus error signal, and then the DVD objective lens is switched to perform the same processing. These two amplitude data are compared to determine the type of optical disc (DVD or CD) loaded.
- the type of optical disk is determined by utilizing the difference in the output of the photodetector between the light of wavelength 640 nm for the light source for DVD and the light of wavelength 780 nm for the light source for CD and CD-R. Determine. That is, the optical disk is irradiated with light having a wavelength of 640 nm, and then irradiated with light having a wavelength of 780 mm, and the type of the optical disk is determined from the comparison of read output signal levels obtained with each light.
- Patent Document 3 it is possible to prevent such a situation that erroneous rewriting or erasing is performed.
- the laser beam for the CD is irradiated, and then the objective lens that emits the light beam ⁇ ⁇ ⁇ ⁇ to the disk is moved toward the disk.
- the type of disc related to the movement is determined from the focus error signal waveform obtained from the reflected light beam force from the disc.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-208368
- Patent Document 2 Japanese Patent Application Laid-Open No. 10-261258
- Patent Document 3 Japanese Patent Application Laid-Open No. 11 283319
- An object of the present invention is to provide a focus pull-in method for quickly determining the disc standard without damaging the disc, and an optical disc apparatus using the method.
- the present invention provides a first light source emitting light of a first wavelength, a second light source emitting light of a second wavelength, light of a first wavelength, and a second wavelength.
- An actuator capable of moving between the second position and the second position, focus detection means for receiving the light of the first wavelength and the light of the second wavelength, and outputting a signal corresponding to the state of the received light, A focus operation means for outputting a focus error signal in response to the output of the detection means, and a focus error signal which is an output of the focus operation means, the first light source And control means for controlling the lighting of the second light source and the position of the actuator with respect to the first direction substantially perpendicular to the main surface of the mounted optical disc, the control means including a focus error signal determination unit, The focus error signal determination unit uses the focus error signal output from the focus calculation means while the actuator moves from the first position to the second position, or from the second position to the first position. It is an optical disc device to detect
- the actuator includes a contact preventing member that constitutes a part of the surface of the actuator, and at least a portion of the contact preventing member corresponds to the optical disc mounted with the actuator. It is preferable to configure the end.
- the first position is a position where the closest end of the contact preventing member of the actuator is in contact with the mounted optical disc.
- control means includes an actuator position monitoring unit that monitors the position of the actuator.
- control means further include a hold signal generation unit that generates a hold signal for stopping the actuator for a predetermined period.
- a motor for moving the actuator in a second direction perpendicular to the first direction and parallel to the radial direction of the loaded optical disc, and a second direction of the optical disc And a stop bar for restraining movement in the direction toward the inner circumferential portion of the loaded optical disc at a predetermined position
- the control means further including an innermost circumferential movement instruction generation unit, and a motor
- the actuator is moved to a position abutted against the stop in the second direction.
- control device further includes an intelligent switch and a non-volatile memory
- control means stores an intelligent flag relating to the pressing history of the intelligent switch in the non-volatile memory, and further, the intelligent flag It is preferable to include an ignition flag determination unit that determines the state of
- the apparatus further includes a spindle motor for rotating the mounted optical disc, and the control means controls the rotation of the spindle motor and stops the spindle motor. It is preferable that the focus error signal determination unit detect a quasi-in-focus state in a stopped state.
- the apparatus further includes a third light source for emitting light of a third wavelength, and a third objective lens for condensing light of the third wavelength at a predetermined position,
- the effector supports the third objective lens, the focus detection means receives the light of the third wavelength, outputs a signal corresponding to the state of the received light, and the control means controls the lighting of the third light source. Is preferred.
- the second objective lens and the third objective lens be configured by a common lens.
- the first wavelength is near 405 nm
- the second wavelength is near 650 nm
- the third wavelength is near 780 nm.
- the present invention in one aspect thereof, is a method of detecting an information recording surface included in an optical disc mounted on an optical disc device using light of a first wavelength and light of a second wavelength, The presence or absence of the recording surface at the first depth of the loaded optical disc is determined by irradiating the light of the first wavelength and detecting the quasi-focus state without rotating the loaded optical disc, and The presence or absence of the recording surface at the second depth of the loaded optical disc is determined by irradiating the light of the second wavelength and detecting the quasi-focused state without rotating the loaded optical disc, and the bow of the focus is determined.
- This is a focus pull-in method that performs I-focus.
- a plurality of light sources emitting light of different wavelengths, and a first position spaced apart from a first position close to an optical disc mounted supporting the plurality of light sources.
- a means for generating a focus error signal based on light emitted from at least one of the plurality of light sources, and controlling the plurality of light sources and the light actuator and
- An optical disc apparatus having a control means capable of receiving the light, which determines the type of the standard of the mounted optical disc, and performs a focus pull-in method, in which an actuator is attached.
- An actuator moving step for moving to the first position with respect to a first direction which is a direction substantially perpendicular to the main surface of the optical disc.
- a step of lighting the first light source included in the plurality of light sources the Akuchiyue Ichita to the first position forces the second position
- a quasi-focus state was detected by monitoring the second focus error signal based on the light emitted from the second light source while lighting the light source and moving the actuator from the first position to the second position.
- the second monitoring step In the case of closing the focus control loop, the second monitoring step, the step of lighting the third light source included in the plurality of light sources, and the light emitted by the third light source while moving the actuator to the first position force second position. And a third monitoring step which closes the focus control loop when a quasi-in-focus condition is detected by monitoring a third focusing error signal based on A write method.
- the mounted optical disc in the first monitoring step, the second monitoring step, and the third monitoring step, is preferably in a stationary state.
- the first light source emits light having a wavelength near 405 nm
- the second light source emits light having a wavelength near 650 nm
- the third light source emits light having a wavelength near 650 nm. It is preferred to emit light having a wavelength near 780 nanometers.
- the actuator has a contact preventing member that forms a part of the surface of the actuator, and at least a portion of the contact preventing member is for an optical disc on which the actuator is mounted. It is preferable to move the actuator to the first position, which is the position where the closest end is configured and the actuator moving step is in contact with the optical disc on which the closest end is mounted.
- the optical disk apparatus has a spindle motor for rotating the mounted optical disk, and the control means is capable of controlling the spindle motor, and the first monitoring step is a quasi-coincidence.
- the control means is capable of controlling the spindle motor
- the first monitoring step is a quasi-coincidence.
- the optical disk apparatus moves the actuator in a direction substantially perpendicular to the first direction and substantially parallel to the second direction which is the radial direction of the loaded optical disk. And a stopper that prevents the movement of the actuator in the second direction.
- the control means is capable of controlling the motor, and moves the actuator in a direction substantially parallel to the first direction and in a direction substantially parallel to the second direction which is the radial direction of the mounted optical disc. It is preferable to have the step of stopping the movement of the actuator at a position where the light emitted from the first light source and the second light source is irradiated to a predetermined region located at the innermost circumferential portion of
- the predetermined area is preferably a pre-pit area of the loaded optical disc.
- an actuator moving step is performed, a first light source lighting step is performed, and a first monitoring step is performed in order to detect a quasi-focused state by the first light source. If, in the first monitoring step, the semi-focused state is not detected by the first focus error signal, the actuator moving step is executed to detect the semi-focused state by the second light source, and the second light source lighting step is performed. To execute the second monitoring step, and in the second monitoring step, if the quasi-focused state is not detected by the second focus error signal, the third light source is used to detect the quasi-focused state. It is preferable to execute an actuator moving step, a third light source lighting step, and a third light source monitoring step.
- the optical disc apparatus has a memory for storing an ejector switch for attaching and detaching an optical disc and an ejector flag related to the depression history of the ejector switch, and relates to the depression history of the ejector switch.
- the first monitoring step further includes the step of setting the state of the indicator flag to the OFF state
- the second monitoring step further includes the step of setting the state of the identifier flag to the OFF state
- the third monitoring step further includes the step of turning off the state of the indicator flag.
- the focus pull-in method of the present invention and an optical disk apparatus using this method can accurately and quickly discriminate the type of optical disk without damaging the information recording surface and the surface of the optical disk.
- FIG. 1 is a schematic view of an optical disc apparatus according to a first embodiment of the present invention.
- FIG. 2A Flowchart of focus pull-in method according to the first embodiment
- FIG. 2B Flowchart of focus pull-in method according to the first embodiment
- FIG. 3A Operation explanatory drawing of the focus pull-in method according to the first embodiment
- FIG. 3B Typical profile example of the focus error signal detected in the states b to d of FIG. 3A
- FIG. 3C Typical profile example of the focus error signal detected in the states e to g of FIG. 3A
- FIG. 4 is a schematic view of an optical disc apparatus according to a second embodiment of the present invention.
- FIG. 5A Flowchart of focus pull-in method according to the second embodiment
- FIG. 5B Flowchart of focus pull-in method according to the second embodiment
- FIG. 7 is a schematic view of an optical disc apparatus according to a third embodiment of the present invention.
- FIG. 8A Flowchart of focus pull-in method according to the third embodiment
- FIG. 8B Flowchart of focus pull-in method according to the third embodiment
- FIG. 9 is a schematic view of an optical disc apparatus according to a fourth embodiment of the present invention.
- FIG. 10A Flowchart of focus pull-in method according to the fourth embodiment
- FIG. 10B Flowchart of focus pull-in method according to the fourth embodiment
- FIG. 1 is a schematic view of an optical disc apparatus according to a first embodiment of the present invention.
- the optical disc apparatus 100 has an optical head 102.
- the optical head 102 includes laser light sources 125, 126, and 127, and light emitted from these light sources is irradiated onto the optical disc 101 mounted on the optical disc apparatus 100 through the objective lens 121 or 122.
- the laser light source 125 can emit light (blue light ( ⁇ )) having a wavelength ( ⁇ ) near 405 nm.
- the laser light source 126 can emit light (red light (R)) having a wavelength of about 650 nm.
- the laser light source 127 can emit light (infrared light (IR)) having a wavelength (IR) near 780 nm.
- IR infrared light
- the blue light emitted from the laser light source 125 is incident on the optical disc 101 via the objective lens 121, and is condensed on the information recording surface 110b at a predetermined depth TB from the surface of the light source 125 side disk.
- the red light emitted from the laser light source 126 and the infrared light emitted from the laser light source 127 pass through the wavelength selective hologram 120 and enter the optical disc 101 through the objective lens 122, and are predetermined from the disk surface of the light sources 126 and 127. Focus on the information recording surfaces 110r and 110ir located at the depth TR and TIR, respectively.
- the optical disk apparatus 100 only two of the laser light sources 125, 126 and 127 may be used. By having two light sources in any case, it is possible to configure an optical disk apparatus capable of supporting a plurality of media standards.
- the wavelength emitted by the light source should be selected to be compatible with the media standard to be reproduced or recorded.
- the objective lenses 121 and 122 are integrally supported by the actuator 124, and the objective lenses 121 and 122 both move toward and away from the optical disc 101 by electromagnetically driving the actuator 124. It is possible.
- the actuator 124 has a contact preventing member 123 for the purpose of preventing the objective lens 121 or 122 from coming into contact with the disk surface.
- the upper end of the contact prevention member 123 is closer to the optical disc 101 than the upper ends of the objective lenses 121 and 122.
- the contact preventing member 123 is, for example, made of Dyracon (registered trademark) so as not to damage the surface of the optical disc 101 when the actuator 124 approaches the optical disc 101 and the contact preventing member 123 abuts on the surface of the optical disc 101.
- “Jyuracon” is a resin mainly composed of polyoxymethylene, which is a registered trademark of Polyplastics. Red light and infrared light are A configuration in which the light is collected by the objective lens 122 may be used. The light may be collected by a separate objective lens. In this case, the actuator 124 is configured to integrally support the three objective lenses.
- the present optical disc apparatus 100 has light sources 125 and 126, and a focus detection light receiving element 128 which is a focus detection means that emits light with 127 power and receives light reflected by the optical disc 101, and 129.
- the focus detection light receiving elements 128 and 129 send outputs corresponding to the received light to the focus calculation units 135 and 136.
- the focus operation units 135 and 136 which are focus operation means, obtain focus error signals FEB, FER and F EIR using well-known operation methods based on the inputs from the focus detection light receiving elements 128 and 129. It is a circuit that can be output to the controller 104.
- the controller 104 which is a control means, is also microprocessor or DSP, and can execute a program based on the focus pull-in method of the present invention. Also, the controller 104 can drive the laser light source drivers 131, 132 and 133, and the laser light sources 131, 132 and 133 can be used to indicate that the controller 104 has a light source. 125, 126 and 127 can be turned on or off at the desired output.
- the controller 104 can drive the actuator driver 134, and the driver driver 134 supplies drive current to the actuator 124 based on the instruction of the controller 104. By changing the drive current, the distance between the actuator 124 and the optical disc 101 changes. Furthermore, the present disc apparatus 100 can be provided with a sensor (not shown) disposed on the contact preventing member 123 of the actuator 124, and this sensor detects the contact of the contact preventing member 123 with the optical disc 101. Send that effect to controller 104.
- controller 104 can drive the motor driver 151, and the motor driver 151 can rotate or stop the spindle motor 105 based on the instruction of the controller 104.
- the controller 104 that executes a program based on the focusing method of the present invention drives the laser drivers 131, 132, and 133, and the actuator driver 134, and the laser light sources 125, 126, and , Blink 127 and control the vertical movement of actuator 124,
- the focus error signal determination unit 104a included in the controller 104 determines the type of the optical disc 101 based on the force error signals FEIR and FER and FEB, and executes focus pull-in.
- the controller 104 may include an actuator position monitoring unit 104 b that monitors (monitors) the current position of the actuator 124 as needed. In that case, the actuator position monitoring unit 104 b receives information from a sensor (not shown) for sensing the current position of the actuator 124, and grasps the position of the end actuator 124.
- the optical disc 101 mounted on the optical disc apparatus 100 has a protective layer on its surface, and at least one information recording surface 110 b, 11 Or, and l l O ir inside.
- the thickness of the protective layer that is, the depth from the optical disc surface to the information recording surface 10b, 10r and 10ir, is 0.1 mm, respectively.
- l mm ( TIR)
- the numerical aperture (NAB) of the objective lens 121 for forming a light spot on the information recording surface 110 b with the protective layer thickness TB 0.1 mm, which is the narrowest distance from the optical head 102, is designed to be 0.85 .
- the light spot is formed on the light source side optical path of the objective lens 122 forming an optical line
- the wavelength selective hologram 120 acts as a concave lens for light having an infrared wavelength ( ⁇ IR). Infrared light incident on the wavelength selective hologram 120 is incident on the objective lens 122 with an increased degree of divergence. On the other hand, the wavelength selective hologram 120 transmits the incident red light as it is, and the red light enters the objective lens 122. Due to the action of the wavelength selective hololide 120, the numerical aperture (NAR) for red light of the objective lens 122 is 0.6, and the numerical aperture (NAIR) for infrared light of the objective lens 122 is 0.45. Become.
- the optical disc 101 has a plurality of information as shown in FIG. 1 when one information recording surface 110 b, 11 Or or 1 l O ir is provided in at least one depth (protective layer thickness). It does not have to be a multilayer disc with a recording surface.
- FIGS. 2A and 2B are flowcharts of the focus pull-in method of the first embodiment
- FIG. 3 is an operation explanatory view of the focus pull-in method of the first embodiment.
- Focus determines the standard of the optical disc loaded in the optical disc device, moves the optical head to the range where the focus error signal can be correctly taken, and turns on the focus servo (control) loop (focus refers to the operation up to closing the servo (control) loop.
- the controller 104 sends an instruction to the actuator driver 134 to raise the actuator 124 (to approach the optical disk 101).
- the drive current is supplied to the actuator 124, and the actuator 124 approaches the optical disc 101 slowly, and the contact preventing member 123 abuts on the surface of the optical disc 101 (see state a in FIG. 3;).
- the moving distance of the actuator 124 is proportional to the product of the moving speed of the actuator 124 and the time for moving at the moving speed. And there is a known relationship (eg, proportional relationship) between the moving speed and the drive current. Therefore, the controller 104 can realize the contact between the contact prevention member 123 and the optical disc 101 by supplying a predetermined drive current for a predetermined time.
- the current value and the energization time may be stored in advance by the controller 104, and the energization time may be measured by a built-in timer or the like.
- the controller 104 includes the actuator position monitoring unit 104b
- the actuator position monitoring unit 104b detects the contact of the contact preventing member 123 with the surface of the optical disk 101 based on a signal from a sensor (not shown). can do.
- the controller 104 sends an instruction to stop the actuator 124 at that position to the actuator driver 134, and the contact preventing member 123 of the actuator 124 comes to rest in a state of being in contact with the optical disc 101.
- This position (the position of the actuator 124 with the contact prevention member 123 in contact with the optical disc 101) is taken as the first actuator position.
- the controller 104 sends an instruction to light the light source 125 to the laser driver 131.
- Ru The laser driver 131 supplies a current to the laser light source 125, and the light source 125 starts emitting blue light (wavelength ⁇ B).
- the controller 104 After emission of the blue light is started, the controller 104 receives the focus error signal FEB related to the blue light received by the focus detection light-receiving element 128 sent by the focus calculation unit 135, via the actuator driver 134.
- the actuator 124 is gradually moved in a direction to move the objective lens 121 away from the optical disc 101.
- a focus pull-in operation is performed on the assumption that a BD (bulley disc) is mounted on the optical disc apparatus 100.
- the controller 104 starts the focus search.
- an information recording surface 11 Ob (reflection surface) is present at a depth of 0.1 mm.
- the downward movement of the activator 124 causes the blue light focal point (that is, the focal point) to cross the information recording surface 110b (from state b to state c in FIG. 3A to state d). That is, the focal point of blue light starts at a position where the information recording surface 110b is in an out-of-focus state, gradually falls, passes through a semi-in-focus state, and becomes in-focus state. It will move to the in-focus position.
- the in-focus state refers to, for example, a state in which the detected focus error signal has a value of zero or near zero and shows a significant value of non-zero
- the in-focus state is, for example, 2 It refers to a state in which the detected focus error signal indicates zero, which is surrounded by an area indicating one quasi-focus state.
- the focus error signal FEB output from the focus calculation unit 135 draws a so-called S-shaped curve as shown in FIG. 3B.
- the focusing lens signal FEB increases in the positive direction (state b in FIG. 3B) In focus).
- the signal reaches a positive peak when the focal point is at a position distant from the information recording surface by 1 to 5;
- the focus error signal sharply decreases and becomes 0 at the in-focus position (state c in FIG. 3B (in-focus state)).
- the focal point moves away from the information recording surface 110b, it converges to the zero level via a negative peak (state d in FIG. 3B) (non-focused state).
- the signal exhibits a negative peak when the focal point is at a position of about 1 to 5 ⁇ m from the information recording surface 110 b.
- the focus error signal determination unit 104a of the controller 104 detects a semi-focused state from the focus error signal FE B, for example, detects an S-curve in the focus error signal FEB (at least state b to state in the curve of FIG.
- the portion c is detected (YES in step S104)
- the media standard of the optical disc 101 loaded is determined by the detection of the quasi-focus state, and the normal focus control is started.
- the media standard of disk is determined while the optical disk 101 is kept stationary, that is, it is not necessary to rotate the optical disk 101, and the focus pull-in can be completed quickly. it can.
- the detection of the S-shaped curve in step S104 is performed, for example, using a value approximately midway between the expected S-shaped peak (the maximum point of the curve included in state b in FIG. 3) and the zero level as a threshold.
- the threshold in the case of the threshold, the focus corresponds to a position away from the information recording surface 110b by + 0.5-2. 2.
- the focus error signal FEB force must be greater than this threshold. It may be performed from the point of view.
- the threshold may be 30% to 90% of the expected peak value, not 50% of the expected peak value. In FIG. 3B, the threshold is shown as Vth.
- the inclination of the focus error signal may be determined, and the change of the sign of the inclination may be detected to detect the semi-focused state.
- the quasi-in-focus state may be detected by finding the rate of change of inclination of the focus error signal (second derivative of the focus error signal) and detecting the inflection point.
- the controller 104 determines that the mounted optical disc 101 is a BD, and starts focus control.
- the controller 104 sends an instruction to the motor driver 151, and the spindle motor 105 rotates, and the optical disk 101 starts to rotate.
- the process proceeds to step S107. If the total movement distance is less than the predetermined value (NO in step S106), the process returns to step S104 and continues to receive the input of the focus error signal FEB.
- This predetermined value may be, for example, the total movement distance of the actuator 124 when the actuator 124 is lowered to a position where the focal point comes out from the inside of the optical disc 101.
- the total movement distance of the actuator 124 when the focal point of the blue light passes the near 0.1 mm depth of the optical disc 101 and moves to a shallow position may be used.
- the total moving distance of the actuator 124 is equal to the above predetermined value, and the position of the actuator 124 in the state is set as the second actuator position. That is, the second actuator position is set below the first actuator position by an interval of the above-mentioned predetermined distance.
- the controller 104 includes the actuator position monitoring unit 104b, it is desirable to monitor the total moving distance of the actuator 124 from the start of the movement of the actuator 124 in step S103.
- the quasi-focus state is not detected from the focus error signal FEB, that is, for example, when the process proceeds to step S 107 without the value of the focus error signal exceeding the threshold, it is not the BD standard.
- the optical disk of is mounted.
- the information recording surface 110r is also positioned at a depth of 0.6 mm on the surface of the optical disc 101, so even when the optical head 102 is pressed against the optical disc 101, blue light is emitted. Focus point does not reach the information recording surface l lOr. Thus, the blue light focusing point crosses the information recording surface l lOr and no S-curve is detected (corresponding to the state e, the state f and the state g in FIGS. 3A and 3B) o
- the controller 104 sends an instruction to turn off the light source 125 to the laser driver 131.
- the laser driver 131 stops the emission of blue light (wavelength ⁇ ) of the laser light source 125. Note that this step is not essential. This is because even if the following steps are performed with the laser light source 125 turned on, blue light does not reach the information recording surface l lOr and l l l Oir and there is no risk of damage. This step is performed for the purpose of enhancing safety
- the controller 104 again brings the contact preventing member 123 into contact with the surface of the optical disc 1 in the same manner as step S101, and stops it at that position (first optical position).
- the controller 104 sends an instruction to light the light source 126 to the laser driver 132.
- the laser driver 132 supplies a current to the laser light source 126, and the light source 126 starts emitting red light (wavelength R).
- the controller 104 receives the focus error signal FER related to the red light received by the focus detection light-receiving element 129 sent by the focus calculation unit 136 via the actuator driver 134.
- the actuator 124 is gradually moved in a direction to move the objective lens 122 away from the optical disc 101.
- steps S109 and S110 a focus pull-in operation is performed on the assumption that the DVD is loaded in the optical disc apparatus 100.
- the red light emitted from the objective lens 122 is condensed at a position slightly deeper than the 0.6 mm depth from the disc surface when the contact preventing member 123 of the actuator 124 is in contact with the optical disc 101. Do. After the actuator 124 starts moving downward (after step S110), the controller La 104 initiates a focus search.
- an information recording surface 11 Or (reflection surface) is present at a depth of 0.6 mm.
- the downward movement of the activator 124 causes the focal point of the red light (ie, the focal point) to cross the information recording surface l lOr.
- the focal point of the red light starts at an unfocused position with respect to the information recording surface lOr, gradually falls, passes through the semi-focused state, and is brought into the in-focused state. It moves from the point to the out-of-focus position.
- the focus error signal FER output from the focus calculation unit 136 draws a so-called S-shaped curve.
- the focus error signal FER increases in the positive direction (quasi-focused state).
- the signal reaches a positive peak when the focal point is at a distance of about 1 to 5 ⁇ m from the information recording surface.
- the focus error signal sharply decreases and becomes 0 at the in-focus position (in-focus state).
- the focal point moves away from the information recording surface l lOr, it converges to the zero level via a negative peak (non-focused state).
- the signal shows a negative peak when the focal point is at a position of 1 to 5 ⁇ m from the information recording surface l lOr.
- step S104 when the focus error signal determination unit 104a of the controller 104 detects a semi-focused state from the focus error signal FER, for example, detects an S-shaped curve in the focus error signal FER (YES in step S111). ), The loaded optical disc 101 is determined to be a DVD, and the process proceeds to step S112. If not detected (NO in step S111), the process proceeds to step S113.
- the detection of the S-shaped curve in step S111 may be performed in the same manner as the detection of the S-shaped curve in step S104.
- the controller 104 determines that the mounted optical disc 1 is a DVD, and starts focus control.
- the controller 104 sends an instruction to the motor driver 151 and the spindle motor 1
- Step S 113 As in step S106, when the total movement distance of the actuator 124 exceeds the predetermined value, the controller 104 determines that the loaded optical disc 1 is not a DVD (YES in step S113), and proceeds to step S114. Do. If the total movement distance is less than the predetermined value (NO in step S113), the process returns to step S111, and input acceptance of the focus error signal FER is continued.
- This predetermined value may be, for example, the total movement distance of the actuator 124 when the focal point of the red light passes through the near 0.6 mm depth of the optical disc 101 and moves to a shallow position.
- the predetermined value in this case is determined to be at a depth of 0.1 mm or more of the focal point 1S depth of red light as a safety measure for the optical disc 1.
- the position at which the actuator 124 is present when the actuator 124 is lowered by the total movement distance may be the same as the second actuator position, or another position (third actuator Position).
- the quasi-in-focus state is not detected from the focus error signal FER, that is, for example, when the process proceeds to step S 114 without the value of the focus error signal exceeding the threshold value, it is other than the DVD standard.
- the optical disk is mounted.
- the information recording surface l l Oir is located at a depth of 1.1 mm from the surface of the optical disc, so even when the optical head 102 is pressed against the optical disc, red light is collected. The point does not reach the information recording surface l l Oir. Therefore, the red light focusing point crosses the information recording surface l l Oir, and the S-shaped curve is not detected.
- the controller 104 sends an instruction to the laser driver 132 to turn off the light source 126.
- the laser driver 132 stops the emission of red light (wavelength R) of the laser light source 126. Note that this step is not essential. This is because even if the following steps are performed with the laser light source 126 turned on, red light does not reach the information recording surface lO ir and cause damage. This step is performed for the purpose of enhancing safety.
- Step SI 16 After the emission of the red light is stopped, the controller 104 again brings the contact preventing member 123 into contact with the surface of the optical disc 101 in the same manner as step S101, and stops it at that position (first actuator position).
- the controller 104 sends an instruction to light the light source 127 to the laser driver 133.
- the laser driver 133 supplies a current to the laser light source 127, and the light source 127 starts to emit infrared light (wavelength emission).
- the controller 104 After emission of infrared light is started, the controller 104 receives the focus error signal FEIR related to the infrared light received by the focus detection light-receiving element 129 sent from the focus calculation unit 136, while operating the actuator driver.
- the actuator 124 is gradually moved through 134 so that the objective lens 122 moves away from the optical disc 101.
- steps S116 and S117 a focus bow I loading operation is performed on the assumption that the CD is loaded in the optical disc apparatus 100.
- the contact prevention member 123 of the actuator 124 is in contact with the optical disc 101, the infrared light emitted from the objective lens 122 is condensed at a position slightly deeper than the position at which the disc surface force is 1.1 mm. It will After the activator 124 begins to move downward (after step S117), the controller 104 starts the focus search. If the currently mounted optical disc 101 is a CD, an information recording surface l l Oir (reflection surface) exists at a depth of 1.1 mm.
- the downward movement of the factor 1 24 causes the focal point of the infrared light (ie, the focal point) to cross the information recording surface l l Oir.
- the focal point of the infrared light starts to move out of position with respect to the information recording surface l l Oir, gradually descends, passes through the semi-focused state, and becomes in-focused state. Force Will move to the out-of-focus position.
- the focus error signal FEIR output from the focus calculation unit 136 draws a so-called S-shaped curve.
- the focus error signal FEIR increases in the positive direction (quasi-focused state).
- the signal reaches a positive peak when the focal point is at a distance of about 1 to 5 ⁇ m from the information recording surface.
- the focus error signal decreases rapidly and becomes 0 at the in-focus position (in-focus state).
- the focus moves away from the information recording surface l l Oir, it passes through a negative peak and converges to the zero level (non-focused state).
- the signal shows a negative peak when the focal point is at a position of about 1 to 5 ⁇ m from the information recording surface l l Oir.
- step S118 when the focus error signal determination unit 104a of the controller 104 detects a quasi-focus state from the focus error signal FEIR, for example, detects an S-shaped curve in the focus error signal FEIR (step S118). It is determined that the mounted optical disc 101 is a CD, and the process moves to step S119. If not detected (NO in step S118), the process proceeds to step S120.
- the detection of the S-curve in step S118 may be performed in the same manner as the detection of the S-curve in steps S104 and S111.
- the controller 104 determines that the mounted optical disk 101 is a CD, and starts focus control.
- the controller 104 sends an instruction to the motor driver 151, and the spindle motor 105 rotates, and the optical disk 101 starts to rotate.
- the controller 104 determines that the loaded optical disc 1 is not a CD when the total movement distance of the actuator 124 exceeds the predetermined value (YES in step S120), It transfers to S121. If the total movement distance is less than the predetermined value (NO in step S120), the process returns to step S118, and input acceptance of the focus error signal FEIR is continued.
- This predetermined value may be, for example, the total moving distance of the actuator 124 when it passes near the depth 1.1 mm of the focal point 1S optical disc 101 of infrared light and moves to a shallow position.
- the predetermined value in this case be determined so that the focal point of the infrared light is at a depth of 0.6 mm or more, as a safety measure for the optical disc 101.
- the position where the actuator 124 is present when the actuator 124 is lowered by the total movement distance may be the same as either one of the second actuator position or the third activator position, or , You may be at another position (the fourth actuator position)! / ,.
- the controller 104 sends an instruction to turn off the light source 127 to the laser driver 133.
- the laser driver 133 stops the emission of infrared light (wavelength and IR) of the laser light source 127. Note that this step is not essential. This is because, even if the laser light source 127 is kept on, there is no information recording surface on the optical disc 101 that is damaged by infrared light. This step is performed for the purpose of enhancing safety.
- step S101 to step S120 if any of the BD, DVD, or CD standards is not applied, the controller 104 issues an "error" and ends. This corresponds to, for example, the case where the optical disc is mounted upside down.
- the discs are mounted in the order in which the information recording surface is shallow, that is, in the order of BD, DVD, and CD, and the focus search (focus pull-in To do).
- a BD it can be determined in the process from step S101 to step S104 that the loaded optical disc 101 is a BD, and if a DVD is loaded, the process from step S101 to step S101 is performed.
- the processing up to SI 11 it can be determined that the loaded optical disc 101 is a DVD, and when a CD is loaded, the loaded optical disc 101 is a CD in the processing from step S101 to step S118. It can be determined that there is.
- the BD light source blue light source (light source 125)
- the objective lens is used even if the mounted optical disc 101 is a CD or DVD. Since the focal length of 121 is short, blue light does not reach the information recording surface l lOr or 1 l Oir of the optical disc 101, and therefore, the information recording surface 110 r or l l Oir is not damaged.
- an optical disc apparatus 100 provided with an objective lens 121 dedicated for BD and provided with an objective lens 122 and a hologram 120 separately for DVD and CD. It shows.
- the optical head using a variable-focus lens such as a variable-focus lens, corresponding to BD, DVD, and CD with one lens (for example, using a variable-focus lens to be put to practical use in the future). Intended to exclude the application of the present invention to do not do.
- the present embodiment the case where only one information recording surface exists in one optical disk is described as an example, and a so-called multi-layer optical disk having a plurality of information recording surfaces in one hard disk is also described. The present invention is applicable.
- a multi-layer single structure for example, a dual layer type DVD (8.5 GB), in which information recording surfaces of the same standard are formed at intervals of about 40 m or one disc
- An example is a so-called format compatible disc, in which the information recording surface of the DVD standard is provided at a depth of 0.1 mm from the disc surface and the information recording surface of the BD standard at a depth of 0.6 mm.
- the search power of the information recording surface corresponding to the light source having a short wavelength can also start the focus pull-in processing, so that a reliable optical disc type determination and a safe focus pull-in processing can be realized.
- the actuator 124 is moved to a position in contact with the optical disc 101, and the focus error signal is detected while gradually lowering the force.
- the actuator 124 is used as an objective lens. Move to a position where the light collected at 121 and 122 is collected at a position shallower than the information recording surface 110b, 11 Or or l l Oir of the optical disk 101, and raise it gradually while raising the focus error signal Focusing may be performed by detecting the
- FIG. 4 is a schematic view of an optical disc apparatus according to the present embodiment.
- the optical disc apparatus 200 further includes a controller 204 provided with a hold signal generation unit 204 a in addition to the controller 104 of the optical disc apparatus 100 according to the first embodiment.
- the hold signal generation unit 204a generates a hold signal for keeping the distance between the actuator 124, that is, the objective lenses 121 and 122, and the optical disc 101 in a direction substantially perpendicular to the optical disc 101 constant. While the hold signal is in the ON state, the position of the actuator 124 is kept constant.
- the configuration of the optical disk device 200 may be equivalent to the configuration of the optical disk device 100 in the first embodiment. In the present embodiment, descriptions of apparatus configurations other than the above are omitted.
- FIG. 4 is a flowchart of the focus pull-in method according to the second embodiment of the present invention.
- the difference between the focus pull-in process of this embodiment (flow chart in FIG. 4) and the focus pull-in process of the first embodiment (flowcharts in FIG. 2A and FIG. 2B) is blue light, red light or infrared light.
- the focus error signal FEB, FER or FEIR
- the focus control is immediately started (see FIG. 2A step S105, S112 or FIG. 2BS119).
- the hold signal generation unit 204a of the controller 204 When the focus error signal FEB, FER or FEIR exceeds the threshold value, the hold signal generation unit 204a of the controller 204 generates a hold signal (turns on the hold signal), and the light is put in its default state. The point is to hold the position of the head 102 and to start the rotation of the optical disc 101 while the optical head 102 is held.
- FIG. 6 shows the hold signal 205 generated by the hold signal generation unit 204a of the controller 204 at the time when the controller 204 detects that the value of the focus error signal FEB exceeds the threshold value
- the actuator drive current 207 is a diagram showing a relation between a signal 209 (MTON) for rotating the motor 105, an ON'OFF state 211 of focus control, and a force error signal 201 (FEB).
- MTON signal 209
- FEB force error signal
- the contact state (FIG. 4, step S101) (first actuator position) is realized between the optical disc 101 and the contact preventing member 123.
- the actuator vertical position stabilization panel (not shown) included in the optical head 102 is designed to act on the actuator 124 to exert a paneler equal in weight to the weight on the actuator 124 in the direction opposite to the gravity. It is done. That is, the actuator 124 is designed to be held at a predetermined balanced position by the panel force and the gravity in a state where the actuator drive current 207 does not flow to the actuator 124.
- the optical disc 101 and the contact preventing member 123 have a predetermined distance at this balanced position.
- the actuator 124 In order to raise the actuator 124 further and bring the contact prevention member 123 and the optical disc 101 into contact with each other, the actuator 124 is moved so as to generate a force against the panel force of the actuator vertical position stabilization panel holding the actuator 124. It is necessary to flow a predetermined drive current.
- Region 2 of actuator drive current 207 in Figure 6 07a shows a state where a predetermined drive current required to maintain the contact state flows.
- the actuator vertical position stabilization panel (not shown) included in the optical head 102 is designed to exert a paneler smaller than the gravity acting on the activator 124 on the actuator 124 in the direction opposite to the gravity. If so, the profile of the actuator drive current 207 is different from the profile of this figure. In other words, gravity is dominant in determining the position of actuator 124. Therefore, when the actuator 124 is made to rest on the first actuator position, the actuator drive current exceeds the combined force of the gravity acting on the actuator 124 and the vertical force acting on the contact prevention member 123 from the optical disc 101. It is necessary to supply an actuator drive current that generates a force acting on the actuator 124 in the direction opposite to the resultant force.
- the actuator 124 In order to cause the actuator 124 to descend, the descending speed and acceleration that are generated by causing the actuator drive current to generate a force less than the above-mentioned gravity are controlled by the magnitude of the actuator drive current. In order to cause the actuator 124 to stop at the position other than the first actuator position, an actuator drive current of the same magnitude as the gravity acting on the actuator 124 and generating a force acting in the opposite direction should be applied. .
- step S102 the controller 204 turns on the blue light source 125.
- step S 103 while receiving the focus error signal FEB 201, the controller 204 changes (decreases) the current value to remove the actuator drive current 207 from the current value in the area 207 a, and the focus of the objective lens 121. Bring the (focusing point) close to the recording surface 110b. Region 207b1 shows how the actuator drive current 207 decreases at this time. At this time, the optical head 102 and the optical disc 101 are in a relationship corresponding to the state b in FIG. 3A.
- the focus error signal 201 rises. That is, the focus error signal 201 starts to draw an S-shaped curve.
- the focus error signal 201 exceeds the threshold value 203 (Vth) (YES in step S104)
- the focus error signal determination unit 104a of the controller 204 sends an instruction to the hold signal generation unit 204a, and the instruction is received.
- Ho The field signal generation unit 204a turns on the hold signal 205 (step S201).
- the threshold 203 (Vth) may be a value similar to the threshold (FIG. 2A, step S104) in the first embodiment.
- the magnitude comparison between the threshold 203 (Vth) and the focus error signal 201 (FEB) in step S104 may be performed as follows. Even if the focus error signal FEB201 gradually increases by a small value and reaches a value exceeding the threshold 203 (Vth), the actuator 124 is lowered without shifting to step S 201 at this time. Ru. Eventually, the focus error signal 201 (FEB) takes a local maximum (see the dashed line in the FEB in FIG. 6), and then decreases.
- the focus error signal 201 changes from a value larger than the threshold value Vth to a value equal to the threshold value Vth and changes to a value smaller than the threshold value Vth.
- the hold signal 205 instead of turning on the hold signal 205 at the above-mentioned timing, when the value larger than the focus error signal 201 (FEB) force threshold value Vth becomes equal to the threshold value Vth, the process proceeds to step S201 and the hold signal It may be turned on.
- step S 202 the controller 204 outputs a motor rotation signal 209 (MTON) to the motor driver 151.
- MTON motor rotation signal 209
- the hold signal generation unit 204a turns off the hold signal, and the hold is released (YES in step S203), and the actuator drive current 207 is decreased again (current change). (207b1) (step S204).
- step S105 If the focus of the blue light source 125 approaches the information recording surface 110b and the focus error signal 201 (F EB) force reaches the so-called zero cross point (point 201c in the focus error signal 201 and point 207c in the actuator drive current 207) That is, when the focus error signal 201 (FEB) goes from positive to zero and turns negative (step S205) (see FIG. 3A, corresponding to the state c), the signal FON is internal to the controller 204. The focus control loop is closed and focus control is started (step S105).
- Step S107 Steps S107, S108, S110, Sill, SI12, S113, S206, S207, S208, S209, and S210 [1st embodiment and 2nd embodiment]
- the red light source 126 is used to check the presence of the information recording surface lOr of the DVD standard in the same manner as the processing for the blue light source 125 (steps S101 to S106 and step S201 force et al. S205). Focus pull-in to the information recording surface 110r, and perform processing until the focus loop is closed.
- step S 114 Steps S114, S115, S117, S118, S119, S120, S121, S211, S212, S213, S214, and S215, first and second embodiments.
- the infrared light source 127 is used to check the presence of the information recording surface llOir of the CD standard. If present, the focus is drawn to the information recording surface l l Oir, and processing is performed until the focus loop is closed. If the presence of the information recording surface l lOir of the CD standard can not be confirmed, the controller 204 issues an "error" as in the first embodiment.
- the irradiation amount is 1/6, and even if the optical disc 101 is stationary, the information recording surface 110b, 11 Or, and l l Oir are obtained. Damage to the formed recording film can be considerably reduced. If the optical disc 101 is rotated while maintaining this defocused state, and focus control is performed at a predetermined rotational speed after a predetermined time (T), recording is not performed because it is not stationary this time. The damage to the membrane is even less.
- the fixed time (T) is a time sufficient for the motor 105 to reach a fixed number of revolutions. Force by torque of motor 105 For consumer player or recorder, take about 1 second It is enough if you look at it.
- the laser power at the focus pull-in is lower than at the information reproduction, focus pull-in can be started even if the motor 105 does not reach the predetermined rotational speed. Even at low speeds, it is possible to think that damage to the information recording surface 110b, 11 Or, and l l Oir is small. For example, if the laser power at the time of retraction is set to a half at the time of reproduction, it is possible to pull in the focus when the number of revolutions of half of the predetermined number of revolutions is reached.
- the number of rotations is It is proportional to the square root of time.
- T may be set to 0.25 second.
- FIG. 7 is a schematic view of an optical disc apparatus according to a third embodiment of the present invention.
- the optical disc apparatus 300 further includes a motor drive 361, a motor 306, and a stopper 362.
- the controller 304 issues a command to the motor drive 361, and the command causes the motor 306 to move the optical head 102 to the inner peripheral side of the optical disc 101 (for example, light emitted from the light sources 125, 126 and 127 is in the prepit area). Perform the movement to move).
- the controller 304 further includes an innermost movement instruction generation unit 304a that generates an instruction for moving the optical head 102 to the inner peripheral side of the controller 104 according to the first embodiment.
- a stopper 362 is disposed on the inner peripheral side of the optical disc 101 at a position where it can contact the optical head 102, and the optical head 102 sent to the inner peripheral side by the motor 306 abuts on the stopper 362.
- the STTONO 362 inhibits the further movement of the optical head 102 in contact with the inner circumference side, and a sensor 36 (not shown) which is preferably arranged to be sensible in the vicinity of the stopper 362 or the stopper 362 is an optical head 102 and a stopper 362.
- controller 304 Are configured as follows. Except for the points described above, the optical disc apparatus 300 may have the same configuration as the optical disc apparatus 100 according to the first embodiment.
- FIGS. 8A and 8B are flowcharts of a focusing method according to a third embodiment of the present invention.
- the difference from the flowcharts in FIGS. 2A and 2B is that the light is received until it comes into contact with the innermost stopper 362 before entering the focus pull-in operation (before step S101).
- This is the point at which the process of moving the head 102 to the inner circumferential side (step S301) is present. That is, referring to FIG. 7, the innermost movement instruction generator 304 a of the controller 304 issues a command to the motor drive 361, and the motor 306 moves the optical head 102 to the inner peripheral side of the optical disk 101 according to this command. Start (Fig.
- step S301 When the optical head 101 reaches the innermost circumference, it comes in contact with the stopper 362, and thereafter, the position of the optical head 102 relates to the radial position of the main surface of the optical disc 101, and the information of the optical disc 101 is recorded. It is fixed at a position equal to the position of the innermost circumference (for example, the prepit area).
- a sensor not shown
- Step S101 The following processing may be similar to that of the first embodiment, and thus the description thereof is omitted. Also, the process may be similar to the process after step S101 in the second embodiment.
- the innermost circumference of the optical disc 101 is not used as a general information recording area, and information is recorded in a non-laser-erasable form by means of pits, grooves and the like. Even if the condensed light is irradiated to the area in which the disk is stationary in the stationary state of the disk, it is not the area for recording information from the beginning, so especially the recording film locally on the information recording surface 110b, 11 Or and l l Oir. There is no substantial problem even if the light collection causes damage.
- the optical head 102 by moving the optical head 102 to the innermost circumferential position of the optical disc 101 in advance, it is possible to ensure that the information recorded on the optical disc 101 is not lost. It is possible to execute various focus pull-in operations.
- FIG. 9 is a schematic diagram of an optical disc apparatus according to a fourth embodiment of the present invention.
- the optical disc apparatus 400 of the present embodiment further takes out the optical disc 101 loaded.
- the image switch 407 and the memory 408 are connected to the controller 404.
- the controller 404 further includes an image flag determination unit 404a in addition to the controller 104 of the first embodiment, the controller 204 of the second embodiment, or the controller 304 of the third embodiment.
- the image data flag is a flag that turns on an image data flag in the memory 408, which will be described later, when the object switch 407 is pressed. Under the control of the controller 404, the identifier flag determination unit 404a appropriately detects the state of the identifier flag.
- FIGS. 10A and 10B are flowcharts of a focus pull-in method according to a fourth embodiment of the present invention.
- the difference from FIGS. 2A and 2B is that the pressing history of the image switch (407 in FIG. 9) is also referred to the memory (408 in FIG. 9) and the subsequent results based on the reference result.
- the process has a step of branching (step S401). If it is determined from the reference of the pressing history that "no pressing of the image switch" (NO in step S401), step S401 and subsequent steps are executed, while referring to the pressing history, "the pressing of the image switch is present" If it is determined (YES in step S401), step S101 and subsequent steps are executed.
- the judgment criteria for judgment “No pressing of the image switch” and “Pressing of the icon switch” will be described later.
- the ignition flag determination unit of the controller 404 investigates whether or not the force of the ejector switch is pressed (state of the ignition flag) (step S401).
- the present apparatus 400 determines the optical disc and executes the focusing operation according to the disc type (BD, DVD or CD).
- step S101 the controller 404 executes step S101. Also, in FIG. 10A, steps S101, S102, S103, S104, S105, S106, S107, S108, S109, and S110, and Sill, S112, S113, S114, S115, Sl6, S117, S118, S119, S120, S121, and S122 in FIG. 10B [a first embodiment]. And may be similar to In the present embodiment, the description of these steps is omitted.
- a step of writing the result of disc determination, ie, the type of the currently mounted optical disc 101 into the memory 408 has a step (steps S403, S405, and S407) of turning off an ignition flag described later.
- the criterion for determining that “image switch has been pressed” is that the history of the event that the image switch 407 has been pressed remains.
- the presence of the history of the pressed state refers to, for example, the case where the flag (image flag) related to the event pressing the eject pressing is ON.
- the controller 404 it is desirable for the controller 404 to store the non-volatile memory (for example, the memory 408) by turning on the event flag ("image flag") when the image switch is pressed. . After that, it is desirable that the indicator flag be turned OFF when the focus pull-in is successfully completed.
- the criterion for determining “no pressing of the image switch” in step S 401 is, for example, that the image flag is OFF. Specifically, it refers to the case where the previous force pull-in operation has been completed successfully, and then the digital switch has not been pressed. In this case, since it is considered that the previous focus pull-in operation optical disc has not been replaced, the disc discrimination process for the second time is unnecessary.
- step S401 If it is determined in step S401 that the optical disk 101 is off, the optical disk apparatus 400 starts rotation of the optical disk 101 (step S405). Then, the controller 404 reads, from the memory 408, information about the standard of the optical disc 101 currently installed in the optical disc apparatus 400 (step S406).
- the laser light source of either blue (in the case of BD), red (in the case of DVD) or infrared (in the case of CD) is turned on (steps S407b, S407r, or S407ir) o
- the force to enter the focus pull-in process In this case, the process of bringing the contact preventing member 123 of the end actuator 124 into contact with the optical disc 101 as in steps S101, S108 and S115 is unnecessary. is there.
- the type of the optical disc 101 has already been determined, and the normal pull-in processing and focus control may be started according to the type.
- the focus pull-in operation uses a known and usual method. That is, the controller 404 gradually brings the (objective lens) actuator 124 closer to the optical disk 101, and closes the focus control loop (starts focus control) at the timing when the S-shape of the focus error signal is detected. Step S411).
- the optical disc apparatus of the present invention is not limited to an optical disc apparatus compliant with the three media standards of BD, DVD, and CD.
- the present invention is also applied to an optical disk apparatus compatible with two media standards of BD and DVD.
- the present invention can be applied to an optical disk device compatible with two media standards of BD and CD, or DVD and CD.
- the focus pull-in method and optical disc apparatus according to the present invention are useful as an optical disc recorder, an optical disc player, an optical disc drive for personal computer (PC), and the like that support BD, DVD, and CD recording or reproduction.
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Abstract
Description
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US11/661,761 US20080019224A1 (en) | 2004-09-14 | 2005-09-14 | Focusing Method and Optical Disk Device |
JP2006535171A JPWO2006030818A1 (ja) | 2004-09-14 | 2005-09-14 | フォーカス引込方法および光ディスク装置 |
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JP2007328902A (ja) * | 2006-05-09 | 2007-12-20 | Sony Corp | 対物レンズ装置、光ピックアップ装置、光ディスク駆動装置及び対物レンズの駆動方法 |
US8120998B2 (en) * | 2005-08-01 | 2012-02-21 | Panasonic Corporation | Optical disk drive and method for driving the optical disk drive in relation to a velocity switching point |
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US7492541B2 (en) * | 2006-03-31 | 2009-02-17 | Panasonic Corporation | Apparatus and method of monitoring hard disk drive |
JP4663614B2 (ja) * | 2006-10-18 | 2011-04-06 | 株式会社日立メディアエレクトロニクス | 光ピックアップおよび光学的情報記録再生装置 |
KR20090030109A (ko) * | 2007-09-19 | 2009-03-24 | 도시바삼성스토리지테크놀러지코리아 주식회사 | 디스크 판별 방법 및 이를 이용한 광 디스크 드라이브 |
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JP2011192330A (ja) * | 2010-03-12 | 2011-09-29 | Panasonic Corp | 光ディスクの再生方法 |
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Also Published As
Publication number | Publication date |
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US20080019224A1 (en) | 2008-01-24 |
CN101019177A (zh) | 2007-08-15 |
JPWO2006030818A1 (ja) | 2008-05-15 |
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