JP2006079783A - Disk drive and objective lens control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid a collision between an objective lens and a disk recording medium caused by a shock. <P>SOLUTION: When laser output is turned off and no operation relative to focus servo is conducted, i.e., during loading or unloading or the like, the objective lens is kept at a location where the lens is separated from the disk by a focus actuator means. To be more specific, when it is detected that a shock is applied to a disk drive, the objective lens is accordingly moved away from the disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk drive device that performs recording or reproduction on a recording medium such as an optical disk, and an objective lens control method in the disk drive device.

JP 2000-222744 A Japanese Patent Laid-Open No. 11-185363 JP-A-11-273092

Various types of discs capable of recording data on the user side have been developed and spread as optical discs, magneto-optical discs, magnetic discs and the like. For example, a write-once disk in which data can be written once and a rewritable disk in which data can be rewritten are known.
These disk media are suitable for video and audio recording, and are used in various recording and reproduction systems such as an imaging device such as a video camera and a recording device such as an audio recorder.
In addition, high-capacity recording has been promoted for disk media, and in recent years it has a large capacity to support high-definition video recording, such as DVD (Digital Versatile Disc) discs and Blu-ray Discs. Media is being developed.
In Blu-ray Discs, high-density recording increases the effects of dust, dirt, dirt, and scratches on the disc surface, so the disc media can be stored in the cartridge and the cartridge shutter can be opened during recording and playback. It is supposed to be a structure to make.

One cause of scratches on the disk is that the objective lens of the disk drive device (recording or reproducing device) collides with the disk recording surface.
The objective lens that serves as the laser output end of the pickup is held by a biaxial mechanism (biaxial actuator) so as to be displaceable in the focus direction (direction in which the disk is in contact with and separated from the disk) and tracking direction (in the disk radial direction) If an impact is applied, the objective lens may collide with the disk surface.
For such circumstances, for example, Patent Documents 1, 2, and 3 disclose techniques for avoiding collision between the objective lens and the disk.

By the way, the conventional method for avoiding the collision of the objective lens has been proposed as a technique during a period for performing an operation for recording or reproduction by performing laser output.
Normally, during the period when the focus servo is on (the laser output is naturally on), the objective lens is controlled to a position with an appropriate distance from the disk surface by servo control. Even if it joins, it has some tolerance and does not lead to a collision.
However, when the focus servo is turned off for some reason during recording or reproduction (when servo cannot be applied), the servo collision avoidance function cannot be obtained until the servo is returned.
In order to apply focus servo, it is known that a focus search operation for pulling in the focus servo possible range is performed. The period during which this focus search is being executed, or a disc having a plurality of recording layers. During the focus jump (layer jump) that moves the recording layer to which the focus servo is applied, the servo cannot withstand external impact and the objective lens can collide with the disc There is sex.
The above Patent Documents 1, 2, and 3 describe techniques for avoiding a disk collision of the objective lens during a period during which recording or reproduction is being performed and operations related to focus servo are performed.

However, even when the laser output is off and the operation related to the focus servo is not performed for recording or reproduction, an objective lens collision may occur.
The period in which the operation related to the focus servo is not performed refers to a period in which the operation for driving the focus actuator for the purpose of recording or reproduction such as focus servo, focus search, and focus jump is not performed.
More specifically, in order to start recording or reproduction, a period from when the loaded disk is chucked to the spindle mechanism and the rotation of the disk is started until the laser output is turned on and focus control is performed. Or after the recording or reproducing operation is finished, the servo system and the laser output are turned off, and the control to stop the rotation of the disk is started until the disk rotation stops and the chucking is removed. Naturally, no operation related to the focus servo control is performed. On the other hand, the objective lens and the disk are in a positional relationship that may cause a collision. That is, if a large impact is applied from the outside during such a period, the objective lens may collide with the disk and damage the disk. Of course, the surface of the objective lens may be damaged.

  In particular, in a disk drive device built in a portable device such as an imaging device or an audio device, shock or vibration may occur due to handling by the user when carrying it, dropping it, or loading or unloading a disc. Often given. Accordingly, it is required to prevent collision between the objective lens and the disk even during an operation period during which loading or unloading is performed.

  Therefore, the present invention aims to prevent the objective lens from colliding with the disk recording medium. In particular, the laser output is turned off, and operations related to focus servo such as focus servo, focus search, and focus jump are performed. It is intended to avoid collision of the objective lens within a period that is not present.

The disk drive apparatus according to the present invention comprises a spindle means for chucking and rotating a disk recording medium, a pickup means for performing laser output for recording or reproduction on the disk recording medium, and a laser in the pickup means. Focus actuator means for controlling the movement of an objective lens as an output end in a direction in which the objective lens comes in contact with and away from the disk recording medium; The focus servo means for controlling to maintain and the laser output from the pickup means are turned off, and the focus actuator means causes the focus servo means to perform the operation within the period in which the operation related to the focus servo is turned off. Objective lens And control means for maintaining in position away from said disc recording medium.
In particular, the control means rotates at a predetermined rotational speed at least after the disk recording medium is chucked on the spindle means within a period in which the laser output is off and the operation related to the focus servo is off. A period until the disk recording medium is chucked to the spindle means after an operation of stopping the rotation of the disk recording medium by the spindle means is started. The objective lens is maintained at a position away from the disk recording medium.
Further, an impact sensor means for detecting that an impact has been applied is provided, and the control means is within a period in which the laser output is turned off and the operation related to the focus servo by the focus servo means is turned off. When the impact is detected by the impact sensor means, the objective lens is maintained at a position away from the disk recording medium.
Also in this case, at least a period from when the disk recording medium is chucked to the spindle means until it is rotated at a predetermined rotational speed, or at least the rotation of the disk recording medium by the spindle means is stopped. The position where the objective lens is moved away from the disk recording medium in response to the impact detection by the impact sensor means during the period from the start of operation until the chucking of the disk recording medium to the spindle means is removed. To maintain.

The objective lens control method of the present invention is an objective lens control method in a disk drive device having the above spindle means, pickup means, focus actuator means, and focus servo means, and the laser output from the pickup means is turned off. The focus actuator means is driven and the objective lens is maintained at a position away from the disk recording medium during a period in which the operation related to the focus servo by the focus servo means is off.
Further, when it is detected that an impact is applied to the disk drive device within a period in which the laser output is turned off and the operation related to the focus servo by the focus servo means is turned off, the focus actuator means is turned on. Driven to maintain the objective lens away from the disk recording medium.

The present invention as described above provides a technique for avoiding the collision between the objective lens and the disk recording medium even when an impact is applied from the outside when the laser output is turned off and the operation related to the focus servo is not performed. In addition, when the operation related to the focus servo is not performed, a large current is passed through the coil of the focus actuator means so that the objective lens is maintained at a position away from the disk recording medium.
When the laser output is turned off and the operation related to the focus servo is not performed, for example, a period from when the disk recording medium is chucked to the spindle means until it is rotated at a predetermined rotational speed, that is, disk recording. A period until the medium is loaded and a state where recording or reproduction is possible, or after the operation of stopping the rotation of the disk recording medium by the spindle means is started, the disk recording medium is chucked to the spindle means. There is a period until the king is removed, that is, a period when the disk recording medium is unloaded from the spindle mechanism.
Further, during these periods, a large current may be continuously passed through the coil of the focus actuator means to maintain the objective lens at a position away from the disk recording medium, but continuous large current application is not preferable. In the above period, only when necessary, a large current may be passed through the coil of the focus actuator means to move the objective lens away from the disk recording medium. The time required is when an impact is given to the disk drive device.

  According to the present invention, even when the laser output is turned off at the time of loading or unloading, and the operation related to the focus servo is not performed, the focus actuator means is driven and the objective lens is removed from the disk recording medium. By maintaining the position at a distance, even if an impact is applied to the disk drive device, the collision between the objective lens and the disk recording medium can be avoided, and therefore the disk and the objective lens can be prevented from being damaged. Therefore, the present invention is particularly useful in a device using a disk recording medium for performing high-density recording, a portable device, for example, an imaging device, a portable recording device, a playback device, or the like that has a high possibility of applying an impact. It will be something.

  If it is not appropriate to continuously apply a large current to the coil of the focus actuator means during a period when the operation related to the focus servo such as loading and unloading is not performed, only when necessary, that is, the impact sensor means When an impact is detected by the above, the objective lens may be maintained at a position away from the disk recording medium. In this way, since it is not necessary to always maintain the objective lens at a position away from the disk recording medium, the effect of reducing the burden on the coil of the actuator means and reducing power consumption can be obtained while obtaining the above-described collision prevention effect. Obtainable. Low power consumption is particularly suitable for battery-powered portable devices.

Hereinafter, a disk drive device built in an imaging device (video camera) will be described as an embodiment of the disk drive device of the present invention. The disk drive device records and reproduces captured video data on a cartridge disk as a Blu-ray disk. This will be described in the following order.
1. Cartridge disk structure.
2. Configuration of imaging device.
3. Configuration of the disk drive device.
4). Transition of loading state.
5. Collision avoidance operation example I.
6). Collision avoidance operation example II.
7). Modified example.

1. Cartridge disk structure.

First, the structure of a cartridge disk used as a recording medium in the imaging apparatus of this example will be described with reference to FIGS. Here, an example of a cartridge disc as a category of a Blu-ray disc is given.
9 and 10 are a perspective view of an inner rotor type cartridge disk 90 employed in a Blu-ray disc and an exploded perspective view of the structure thereof. FIG. 11 shows a state where the disk is shielded by the shutter mechanism, and FIG. 12 shows a state where the shutter is opened and the disk is exposed.

In this cartridge disk 90, a cartridge 100 as a flat casing is formed as shown in FIG. 9 by upper and lower shells 112, 113 made of molded parts (synthetic resin molded products) or the like. In the cartridge 100, a disk 114 is accommodated by being inserted horizontally into the inner rotor 115 shown in FIG. 10 with the information recording surface facing downward.
In addition, a disc-shaped disc clamper (chucking pulley) 119 made of a ferromagnetic material such as SUS is disposed immediately above the center hole of the disc 114, and this disc clamper 119 is formed on the lower surface of the upper shell 112. The clamper support ring 120 joined by welding or the like is supported horizontally so as to be rotatable and vertically movable.
The inner rotor 115 has a thin plate structure made of mold parts and the like, and is rotatably housed in a cartridge by upper and lower shells 112 and 113, and a pair of thin plate structures made of mold parts and the like are provided below the inner rotor 115. The shutters 116a and 116b are rotatable and attached horizontally. The inner rotor 115 is formed in a circular dish shape, and a cylindrical outer peripheral wall 115b is vertically raised on the outer periphery of a disc-shaped bottom portion 115a. The inner rotor 115 is horizontally mounted in a state having a gap above the lower shell 113, and is rotatably mounted. An outer peripheral wall 115b of the inner rotor 115 is formed inside an outer peripheral portion of the upper shell 112. In a downward direction, it is rotatably inserted into a vertical cylindrical groove.
The disc 114 is rotatably mounted on the bottom portion 115a of the inner rotor 115 and is horizontally mounted so as to be movable up and down. The inner rotor 115 is loaded with the rotated drive unit 101 shown in FIG. By being driven by a loading mechanism (shutter opening / closing mechanism) of the device, the cartridge 100 is configured to be rotationally driven between a closed position and an open position.
A bottom opening 117 is formed in the lower shell 113 constituting the lower surface of the cartridge 100, and an internal opening 118, which is an opening having substantially the same shape as the bottom opening 117, is also formed in the bottom 115 a of the inner rotor 115. Has been. As shown in FIG. 11, the bottom opening 117 is normally shielded by shutters 116a and 116b.

Although not described in detail, when the cartridge disk 10 is loaded in the recording / reproducing apparatus, the inner rotor 115 is rotated by the mechanism on the recording / reproducing apparatus side. Accordingly, the shutters 116a and 116b connected to the inner rotor 115 and the cam mechanism are rotated. This rotation is performed up to a position where the shutters 116a and 116b open the bottom opening 117, and as a result, as shown in FIG. 12, the disk 114 is placed on the cartridge lower surface side via the bottom opening 117 and the internal opening 118. The information recording surface will be displayed.
On the recording / reproducing apparatus side, an optical head, a chucking mechanism / spindle mechanism, and the like are arranged on the recording surface side exposed as described above. The disk 114 is rotated by the spindle mechanism, and information on the disk 114 is read by the optical head. Recording / playback is performed.

2. Configuration of imaging device.

FIG. 1 shows the configuration of the imaging apparatus 1 incorporating the disk drive device 18 of this example.
The system controller 11 is composed of a microcomputer and controls the entire imaging apparatus 1. That is, operation control of each unit described below is performed.

The camera unit 12 is a part for video imaging, and includes an imaging unit 13, an imaging signal processing unit 14, and a camera controller 15.
The imaging unit 13 detects an imaging light obtained by a lens system including an imaging lens and a diaphragm, a driving system for causing the lens system to perform a focus operation and a zoom operation, and a photoelectric conversion. A solid-state imaging device array that generates an imaging signal by performing the above is provided. The solid-state imaging device array is, for example, a CCD sensor array or a CMOS sensor array.
The imaging signal processing unit 14 includes a sample hold / AGC (Automatic Gain Control) circuit that performs gain adjustment and waveform shaping on a signal obtained by the solid-state imaging device of the imaging unit 13, and a video A / D converter. Generate data.

The camera controller 15 controls the operations of the imaging unit 13 and the imaging signal processing unit 14 based on instructions from the system controller 11. For example, the camera controller 15 performs control (motor control) for causing the imaging unit 13 to perform operations such as autofocus, automatic exposure adjustment, aperture adjustment, and zoom.
In addition, the camera controller 15 includes a timing generator, and the signal processing operation is performed on the solid-state imaging device and the sample hold / AGC circuit of the imaging signal processing unit 14 and the video A / D converter by the timing signal generated by the timing generator. Control.

The camera unit 12 generates captured video data with the above configuration.
The audio signal obtained by the microphone 33 is A / D converted by the audio signal processing unit 34 to generate audio data synchronized with the captured video data.

The recording / reproducing unit 16 is a part that can record and reproduce the captured video data (and audio data obtained by the microphone 33) obtained by the camera unit 12 on a recording medium (cartridge disk 90).
The recording / reproducing unit 16 is provided with a compression encoding / decoding unit 17, a disk drive device 18, and a loading mechanism 40.
The disk drive device 18 is provided with a recording / reproduction controller 19 for controlling the operation in the disk drive device 18. The recording / reproduction controller 19 performs a recording operation, a reproduction operation, and the like in accordance with an instruction from the system controller 11.
Further, the cartridge disk 90 inserted by the user is transferred by the loading mechanism 40, and the shutter is opened as described above, so that the disk drive device 18 can record and reproduce.
The loading mechanism 40 performs an operation of changing various loading states (eject, shutter closed, drive off, drive on), which will be described later, according to a command from the recording / reproducing controller 19.

The compression encoding / decoding unit 17 performs compression encoding processing on the captured video data obtained by the camera unit 12 and the audio data from the audio signal processing unit 34 at the time of imaging, and also decodes the compressed data reproduced by the disk drive device 18. I do.
The captured video data (and audio data) processed by the encoding / decoding unit 17 is supplied to the disk drive 18 and recorded on the cartridge disk 90 (the disk 114 in the cartridge 100 described above).
When data recorded on the disk 114 is reproduced, the video data (and audio data) reproduced by the disk drive 18 is decoded by the encoding / decoding unit 17.
As the compression method, for example, an MPEG (Moving Picture Experts Group) method or another compression method is used.
It is also conceivable that the data to be recorded / reproduced in the disk drive device 18 does not take such a compressed data form.

  Although the configuration of the disk drive device 18 will be described later, the recording / reproduction controller 19 performs control related to recording and reproduction operations and data input / output in the disk drive device 18 based on instructions from the system controller 11.

Captured video data obtained by the camera unit 12 during imaging and video data reproduced from the cartridge disk 90 can be displayed on the viewfinder 31.
When the camera unit 12 outputs captured video data at the time of imaging execution or at the time of imaging standby, the captured video data is supplied to the viewfinder driver 30.
The viewfinder driver 30 performs an operation of causing the viewfinder 31 to display an image based on the captured image data in response to an instruction from the system controller 11. A character image corresponding to an instruction from the system controller 11 is displayed in a superimposed manner.
When reproducing video data from the cartridge disk 90, the video data reproduced and output by the disk drive device 18 and decoded by the encode / decode unit 17 is supplied to the viewfinder driver 30. In response to an instruction from the system controller 11, the viewfinder driver 30 performs an operation of causing the viewfinder 31 to display the supplied video data and a video based on the superimposed character image.
Accordingly, the photographer (cameraman) performs standby for imaging (when checking the subject) and monitoring during imaging, checking the video content recorded on the cartridge disk 90, or performing a simple editing operation while looking at the viewfinder 31. It can be carried out.
Note that the imaging apparatus 1 may be provided with a display unit such as a liquid crystal display unit so that a captured image or a reproduced image can be displayed in the same manner as the viewfinder 31.

Also, audio data reproduced from the cartridge disk 90 is D / A converted by the audio driver 35, subjected to signal processing such as filtering and amplification, and output from the speaker unit 36.
The external interface 20 is a part for inputting / outputting video data and the like to / from audio / visual equipment, information equipment, storage equipment, and the like as external devices.

The ROM 22, the RAM 23, and the flash memory 24 are used as storage and calculation areas for data and programs necessary for the system controller 11, respectively.
For example, the ROM 22 stores a processing program for the system controller 11, fixed data, and the like. The RAM 23 is used as a temporary information storage or work area. The flash memory 24 stores various control coefficients.

In the operation unit 27, various operators for operating the imaging apparatus 1 are prepared. That is, operators for a power on / off operation, an imaging operation (recording operation), a reproduction operation, a recording and reproduction stop operation, a zoom operation, various mode operations, an editing operation, an ejection operation, and the like are formed.
The system controller 11 performs control so that necessary operations are performed on each unit in response to detection of a user operation by these operators.

The power supply unit 32 uses, for example, a DC / DC converter, a DC power source obtained from a built-in battery, or a DC power source generated from a commercial AC power source via a power adapter, to a required level for each circuit unit. Supply power supply voltage. The system controller 11 controls the power on / off by the power supply unit 32 in accordance with the power operation from the operation unit 27 described above.

3. Configuration of the disk drive device.

The configuration of the disk drive device 18 is shown in FIG.
The cartridge disk 90 inserted by the user is conveyed by the loading mechanism 40 as described later, and the disk 114 in the cartridge disk 90 is chucked by the chucking unit 50 of the disk drive device 18.
The disk 114 is rotationally driven by the spindle motor 52 at a constant linear velocity (CLV) during the recording / reproducing operation while being chucked by the chucking unit 50.
At the time of data recording, user data is recorded on the track as a phase change mark by the optical pickup 51, and at the time of reproduction, the mark recorded by the optical pickup is read.
Further, the ADIP information embedded as wobbling of the groove track on the disk 114 is read by the optical pickup 51.
In the management information area on the disc 114, for example, physical information of the disc is recorded as embossed pits or wobbling grooves as reproduction-only management information. The pickup 51 also reads out such information.

  In the pickup 51, a laser diode 51c serving as a laser light source, a photodetector 51d for detecting reflected light, an objective lens 51a serving as an output end of the laser light, and a laser recording light are irradiated onto the disk recording surface via the objective lens 51a. In addition, an optical system (not shown) for guiding the reflected light to the photodetector is formed. The laser diode 51c outputs a so-called blue laser having a wavelength of 405 nm, for example. The NA by the optical system is 0.85.

In the pickup 51, the objective lens 51a is held by a biaxial mechanism (biaxial actuator) 51b so as to be movable in the tracking direction and the focus direction.
The entire pickup 51 can be moved in the radial direction of the disk by a thread mechanism 53.
The laser diode 51 c in the pickup 51 is driven to emit laser light by a drive signal (drive current) from the laser driver 63.

The reflected light information from the disk 114 is detected by the photo detector 51d, and is converted into an electric signal corresponding to the amount of received light and supplied to the matrix circuit 54.
The matrix circuit 54 includes a current-voltage conversion circuit, a matrix calculation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 51d, and generates necessary signals by matrix calculation processing.
For example, a high frequency signal (RF signal) corresponding to reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like are generated.
Further, a push-pull signal P / P is generated as a signal related to groove wobbling, that is, a signal for detecting wobbling.
The RF signal (reproduced data signal) output from the matrix circuit 54 is sent to the data signal processing circuit 55, the focus error signal FE and the tracking error signal TE are sent to the optical block servo circuit 61, and the push-pull signal P / P is the wobble signal processing circuit. 65, respectively.

The data signal processing circuit 55 performs binarization processing, reproduction clock generation processing by PLL, and the like on the RF signal, reproduces data read as a phase change mark, for example, and supplies the data to the data demodulation circuit 56.
The data demodulation circuit 56 performs a run-length limited code demodulation process based on the reproduction clock as a decoding process during reproduction. The demodulated data is supplied to the ECC encoder / decoder 57.
The ECC encoder / decoder 57 performs an ECC encoding process for adding an error correction code during recording and an ECC decoding process for performing error correction during reproduction.
At the time of reproduction, the data demodulated by the data demodulation circuit 56 is taken into an internal memory, and error detection / correction processing and deinterleaving processing are performed to obtain reproduction data.
The data decoded to the reproduction data by the ECC encoder / decoder 57 is read based on an instruction from the recording / reproduction controller 19 and output to the compression encoding / decoding unit 17 in FIG.

The push-pull signal P / P output from the matrix circuit 54 as a signal related to groove wobbling is converted into wobble data digitized by the wobble signal processing circuit 65. A clock synchronized with the push-pull signal is generated by the PLL process.
The wobble data is MSK demodulated and STW demodulated by the ADIP demodulation circuit 66, demodulated into a data stream constituting an ADIP address, and supplied to the address decoder 59.
The address decoder 59 decodes the supplied data, obtains an address value, and supplies it to the recording / reproducing controller 19.

The recording data supplied from the compression encoding / decoding unit 17 to the disk drive device 18 at the time of recording is sent to the memory in the ECC encoder / decoder 57 and buffered.
In this case, the ECC encoder / decoder 57 performs error correction code addition, interleaving, subcode addition, and the like as encoding processing of the buffered recording data.
Further, the ECC encoded data is subjected to RLL (1-7) PP modulation (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) in the recording pulse conversion circuit 64. Note that a clock generated from a wobble signal is used as an encoding clock which is a reference clock for the encoding process during recording.

The recording data generated by the encoding process in the recording pulse conversion circuit 64 is finely adjusted by the laser driver 63 as the recording compensation process for the optimum recording power for the recording layer characteristics, laser beam spot shape, recording linear velocity, etc. Adjustment of the laser drive pulse waveform is performed. Then, the laser driver 63 gives the laser drive pulse subjected to the recording compensation process to the laser diode 51c in the pickup 51 to execute the laser emission driving. As a result, pits (phase change marks) corresponding to the recording data are formed on the disk 114.
The laser driver 63 includes a so-called APC circuit (Auto Power Control), and the laser output is not dependent on the temperature or the like while monitoring the laser output power by the output of the laser power monitoring detector provided in the pickup 51. Control to be constant. The target value of the laser output at the time of recording and reproduction is given from the recording / reproduction controller 19, and the laser output level is controlled to be the target value at the time of recording and reproduction.

The optical block servo circuit 61 generates various servo drive signals for focus, tracking, and thread from the focus error signal FE and tracking error signal TE from the matrix circuit 54, and executes the servo operation.
That is, a focus drive signal and a tracking drive signal are generated according to the focus error signal FE and the tracking error signal TE, and the focus coil and tracking coil of the biaxial mechanism 51b in the pickup 51 are driven by the biaxial driver 68. As a result, a tracking servo loop and a focus servo loop are formed by the pickup 51, the matrix circuit 54, the optical block servo circuit 61, the biaxial driver 68, and the biaxial mechanism 51b.

The optical block servo circuit 61 also outputs a search drive signal for focus pull-in and a jump drive signal for moving the recording layer with respect to the multi-layer disc in response to a focus search command and a focus jump command from the recording / reproducing controller 19. By outputting, a focus search operation and a focus jump operation are executed.
The optical block servo circuit 61 turns off the tracking servo loop in response to a track jump command or seek command from the recording / reproduction controller 19 and outputs a tracking drive signal for jump / seek, Execute seek operation.
The optical block servo circuit 61 generates a thread drive signal based on a thread error signal obtained as a low frequency component of the tracking error signal TE, an access execution control from the recording / playback controller 19, and the thread driver 69 performs a thread mechanism. 53 is driven. Although not shown, the sled mechanism 53 has a mechanism including a main shaft that holds the pickup 51, a sled motor, a transmission gear, and the like, and by driving the sled motor in accordance with a sled drive signal, a required slide of the pickup 51 is obtained. Movement is performed.

The spindle servo circuit 62 controls the spindle motor 52 to perform CLV rotation.
The spindle servo circuit 62 obtains the clock generated by the PLL processing for the wobble signal as the current rotational speed information of the spindle motor 52 and compares it with predetermined CLV reference speed information to generate a spindle error signal. .
At the time of data reproduction, the reproduction clock (clock serving as a reference for decoding processing) generated by the PLL in the data signal processing circuit 55 becomes the current rotational speed information of the spindle motor 52. A spindle error signal can also be generated by comparing with the reference speed information.
The spindle servo circuit 62 outputs a spindle drive signal generated in accordance with the spindle error signal, and causes the spindle driver 67 to execute CLV rotation of the spindle motor 52.
The spindle servo circuit 62 generates a spindle drive signal in response to the spindle kick / brake control signal from the recording / reproducing controller 19 and executes operations such as starting, stopping, accelerating and decelerating the spindle motor 52.

Various operations of the servo system and the recording / reproducing system as described above are controlled by a recording / reproducing controller 19 formed by a microcomputer.
The recording / reproducing controller 19 executes various processes in accordance with commands from the system controller 60.
For example, when a write command (write command) is supplied, the recording / reproducing controller 19 first moves the pickup 51 to an address to be written. Then, the ECC encoder / decoder 57 and the recording pulse conversion circuit 64 cause the supplied data (for example, MPEG video data, audio data, etc.) to be encoded as described above. The laser driver 63 drives to emit light in accordance with the encoded data as described above, and recording is performed.

When a read command for transferring certain data (such as MPEG video data) recorded on the disk 114 is supplied, the recording / reproducing controller 19 first performs seek operation control for the instructed address. . That is, a command is issued to the optical block servo circuit 61 to cause the pickup 51 to access the address specified by the seek command.
Thereafter, operation control necessary to transfer and output the data in the designated data section is performed. That is, data reading from the disk 114 is performed, decoding / buffering in the data signal processing circuit 55, the data demodulation circuit 56, and the ECC encoder / decoder 57 is executed, and the requested data is transferred.

  When recording / reproducing data using these phase change marks, the recording / reproducing controller 19 uses the ADIP addresses detected by the wobble signal processing circuit 65, the ADIP demodulating circuit 66, and the address decoder 59 to perform access and recording / reproducing operations. Take control.

The loader driver 70 is a loading motor drive for causing the loading mechanism 40 to load / unload the cartridge disk 90. The recording / reproducing controller 19 controls the loader driver 70 to execute loading / unloading of the cartridge disk 90 by the loading mechanism 40.
The loader position sensor 71 is a mechanical sensor or an optical sensor provided in a required number in the loading mechanism 40. The loading state by the loading mechanism 40, that is, the conveyance position state of the cartridge disk 90 is detected by the loader position sensor 71 and transmitted to the recording / reproducing controller 19 as a detection signal PS.
For example, the loader position sensor 71 detects the insertion of the cartridge disk 90, the shutter closed state, the drive off state, the drive on state (chucking state), etc. described in FIG. It is said.

The spindle motor 52 is provided with an FG (Frequency Generator) 72 to output an FG pulse signal SFG having a frequency corresponding to the motor rotation speed. The recording / reproducing controller 19 can determine the rotational speed of the spindle motor 52 by detecting the FG pulse signal SFG.
The shock sensor 73 outputs a detection signal SS indicating the level of impact applied to the disk drive device 18 and supplies it to the recording / reproducing controller 19. The recording / reproducing controller 19 can detect that an impact or vibration has been applied and the level of the impact or the like based on the detection signal SS.
The characteristic operation of this example will be described later as collision avoidance operation examples I and II. However, when the collision avoidance operation example I is adopted, it is not necessary to provide the shock sensor 73 for the operation.

4). Transition of loading state.

A state transition by the loading mechanism 40 with respect to the disk drive device 18 in the imaging apparatus 1 will be described.
FIG. 3 schematically shows the loading state of the cartridge disk 90. In the case of this example, the state transition by the loading mechanism 40 is a transition between the four modes of the eject state, the shutter closed state, the drive off state, and the drive on state of FIGS.
Although not shown in FIG. 3, the loading mechanism 40 includes a mechanism for moving the holder 41 and a motor, a mechanism for opening and closing the shutter, and a sensor for detecting that each state has been reached (that is, FIG. 2). Loader position sensor 71) and the like are mounted. For example, the recording / reproducing controller 19 issues a required command to the loader driver 70 to execute the operation of the loading mechanism 40 while detecting the state of the loading mechanism 40 by each sensor.
In addition, a spindle motor 52, a chucking unit 50, and an optical pickup 51 as device units provided in the disk drive 18 are shown at the same time.

FIG. 3A shows an ejected state in which the cartridge disk 90 is ejected outside the imaging apparatus. The holder 41 is a mechanism for holding the inserted cartridge disk 90, and is in a position where the cartridge disk 90 inserted from the insertion / ejection unit 42 can be received in the ejected state.
FIG. 3B shows a shutter closed state, which is a state in which the cartridge disk 90 is loaded inside the apparatus, but the above-described shutters 116a and 116b are closed. For example, when the cartridge disk 90 is inserted from the insertion / ejection unit 42 in the ejected state shown in FIG. 3A, the holder 41 is first transferred to the shutter closed state shown in FIG.
FIG. 3C shows a drive-off state, in which the shutters 116a and 116b of the cartridge disk 90 are opened by a shutter opening / closing drive mechanism (not shown). However, in this drive-off state, the disk 114 is not chucked by the chucking unit 50 and is positioned away from the spindle motor 52 and the optical pickup 51.
FIG. 3D shows a drive-on state in which the disk 114 is chucked on the chucking unit 50 and rotated by the spindle motor 52 in the cartridge disk 90 with the shutters 116 a and 116 b being vacant. is there. In the drive off state and the shutter closed state, the spindle motor 52 is off and is not rotating.
When there is a recording or reproduction instruction in this drive-on state, recording or reproduction is performed with a laser beam from the optical pickup 51 as shown in FIG.

5. Collision avoidance operation example I.

The disk drive device 18 of this example performs an operation to prevent the objective lens 51a from colliding with the disk 114 during loading / unloading.
Here, considering the state transition of the loading mechanism 40 of FIG. 3, the objective lens 51a collides with the disk 114 in the eject state, shutter closed state, and drive off state of FIGS. 3 (a), 3 (b), and 3 (c). That is physically impossible. In the eject state and the shutter closed state, since the shutter of the cartridge disk 90 is closed, it is natural that no collision occurs. In the drive off state, the disk 114 is unchucked, and the pickup 51 and the disk 114 This is because is sufficiently separated.
Then, there is a possibility that the objective lens 51a collides with the disk 114 during the drive-on period of FIG. Even in the drive-on state, after the laser output is started and the operation for recording / reproducing is started, the collision is prevented by the focus servo control.
Accordingly, in this example, in particular, the laser output is turned off, and a predetermined rotation speed is obtained after the disk 114 is chucked at the time of loading within the period when the operation related to the focus servo (focus servo, focus search, etc.) is not performed. The operation for avoiding the collision is performed at least including the period until the rotation is performed.
Further, at the time of unloading, the operation for avoiding the collision is performed at least including the period from the start of the operation of stopping the rotation of the disk 114 by the spindle motor 52 until the chucking of the disk 114 is removed. Done.

FIG. 4 shows the processing of the recording / playback controller 19 during loading.
When the cartridge disk 90 is inserted by the user and the recording / reproducing controller 19 detects the insertion of the disk by the detection signal PS from the loader position sensor 71, loading is started from step F101. That is, the loader driver 70 is instructed to drive the loading mechanism 40, and a series of loading operations shown in FIGS. 3 (a) → (b) → (c) → (e) is started.
Here, the recording / reproducing controller 19 gives an instruction to the optical block servo circuit 61 in step F102 to control the collision avoiding current to flow to the focus coil of the biaxial mechanism 51b. The collision avoidance current is a drive current that maintains the objective lens 51a at a position away from the disk 114, and is a current that is strong to some extent even with respect to an impact. In response to an instruction from the recording / reproducing controller 19, the optical block servo circuit 61 outputs a focus drive signal for applying a collision avoidance current, and causes the collision avoidance current to flow through the focus coil by the biaxial driver 68. As a result, even if there is an impact or vibration, the objective lens 51a is maintained at a position farthest from the disk 114 within the stroke (displaceable range) in the focus direction.
The processing in step F102 may be performed immediately after the loading operation by the loading mechanism 40 is started. For example, the drive-off state in FIG. 3C is reached and the drive-on state in FIG. The process of step F102 may be performed when it is detected that an attempt is made.

In step F103, the recording / reproducing controller 19 confirms that the drive state has been shifted to the drive-on state shown in FIG. 3D by the operation of the loading mechanism 40 (that is, the completion of disk chucking) based on the detection signal PS. A spindle kick pulse is generated by the servo circuit 62 and rotation of the spindle motor 52 is started.
The recording / reproducing controller 19 monitors the FG pulse signal SFG in step F105 after the rotation of the spindle motor 52 is started, and determines whether or not the rotation speed of the spindle motor 52 has reached a specified rotation speed.
When the rotation speed of the spindle motor 52 reaches the specified rotation speed, the process proceeds to step F106, and laser output from the pickup 51 is started. Subsequently, in step F107, the application of the collision avoidance current to the focus coil is terminated, and an instruction is issued to the optical block servo circuit 61 to continue the focus search operation.
Then, the focus servo is pulled in by the focus search, the tracking servo is turned on, and the spindle motor rotation is set by the spindle servo, so that the servo lock is completed in step F108, that is, for recording or reproduction. Assume that the initial operation is completed, and then proceed to necessary processing. For example, thereafter, seeking to the management information area of the disk 114 and reading of management data are performed, and thereafter, requested processing such as recording or reproduction of video data or the like is executed.

  Due to the processing at the time of loading in FIG. 4, at least the disk 114 is chucked and rotated at a specified rotational speed within the loading operation period in which the laser output is off and the operation related to the focus servo is off. The objective lens 51a is maintained at a position far from the disk 114 by the collision avoidance current applied to the focus coil of the biaxial mechanism 51b. Therefore, even if there is an impact or vibration during the loading operation, the objective lens 51a is prevented from colliding with the disk 114.

Next, the processing of the recording / playback controller 19 at the time of unloading will be described with reference to FIG.
When the user performs an eject operation from the operation unit 27, the system controller 11 instructs the recording / playback controller 19 to perform an unloading operation.
Then, the recording / reproducing controller 19 instructs the optical block servo circuit 61 in step F201 to turn off the focus servo and tracking servo. Subsequently, in step F202, application of a collision avoidance current is instructed. In response to the instruction from the recording / reproducing controller 19, the optical block servo circuit 61 outputs a focus drive signal for applying a collision avoidance current, and the biaxial driver 68 causes the collision avoidance current to flow through the focus coil. As a result, even if there is an impact or vibration, the objective lens 51a is maintained at a position farthest from the disc 114 within the stroke in the focus direction.

Subsequently, in step F203, the recording / reproducing controller 19 stops the laser output from the pickup 51, and issues an instruction to stop the rotation of the spindle motor 52 in step F204. In response to this, the spindle servo circuit 62 generates a brake pulse for stopping the spindle rotation, and stops the rotation of the spindle motor 52 via the spindle driver 67.
In step F205, the recording / reproducing controller 19 monitors the FG pulse signal SFG to determine whether or not the rotation of the spindle motor 52 has completely stopped.
When it is determined that the rotation is completely stopped, unloading is started in step F206. That is, the loader driver 70 is instructed to cause the loading mechanism 40 to execute an unloading operation for disc ejection. Thereafter, the loading mechanism 40 sequentially shifts from the loader driver 70 to the state of FIG. 3D → (c) → (b) → (a) according to the drive signal from the loader driver 70.
After the unloading operation is started, the recording / reproducing controller 19 monitors the detection signal PS from the loader position sensor 71 in step F207, and at a safe position where the disk 114 does not collide with the objective lens 51a in the unloading process. It is determined whether or not it has been moved to. The safe position may be the position in the drive-off state in FIG. Therefore, when the recording / reproducing controller 19 detects from the detection signal PS that the unloading operation has reached the drive-off state in step F207, the recording / reproducing controller 19 proceeds to step F208, stops the application of the collision avoidance current to the focus coil, and the objective lens 51a. Is in a free state.

By the processing at the time of unloading in FIG. 5, at least the operation of stopping the rotation of the disk 114 by the spindle motor 52 within the unloading operation period in which the laser output is turned off and the operation related to the focus servo is turned off. The objective lens 51a avoids collision given to the focus coil of the biaxial mechanism 51b during the period from the start until the disk 114 is unchucked (the period until the drive-off in FIG. 3C is reached). It is maintained at a position far from the disk 114 by the current. Therefore, even if there is an impact or vibration during the unloading operation, the objective lens 51a is prevented from colliding with the disk 114.

6). Collision avoidance operation example II.

Next, another collision avoidance operation example at the time of loading / unloading will be described.
In the case of the collision avoidance operation example I described with reference to FIGS. 4 and 5 described above, the objective lens 51a does not oscillate with respect to the focus coil with respect to the focus coil continuously for a certain period of time during loading or unloading. A large current will flow.
For example, the time required for the loading / unloading operation, in particular, the period from the time when the disk 114 is chucked during loading to the time when the disk 114 is rotated at a specified rotational speed, or the time when the disk 114 is rotated by the spindle motor 52 during unloading. If the disk drive device 18 requires only a short time (for example, within several seconds) until the disk 114 is unchucked after the stop operation is started, there is no problem in the operation of the collision avoidance operation example I.
However, depending on the current value of the collision avoidance current and the heat resistance performance of the biaxial mechanism 51b, in the case of the disk drive device 18 in which these periods, that is, the time for which a large current should continuously flow through the focus coil is several seconds or more, The operation of the collision avoidance operation example I may be inappropriate. This is because if the collision avoidance current is passed through the focus coil for a too long time, the focus coil may cause a malfunction due to heat in some cases.
Even if there is no risk of a problem with the focus coil, continuously flowing the collision avoidance current may increase power consumption, which is disadvantageous for battery-powered portable devices, for example.
Therefore, an operation for causing a large current collision avoidance current to flow through the focus coil in a timely manner only when necessary will be described as a collision avoidance operation example II with reference to FIGS. 6, 7, and 8.

FIG. 6 shows the processing of the recording / playback controller 19 during loading.
When the cartridge disk 90 is inserted by the user and the recording / reproducing controller 19 detects the insertion of the disk by the detection signal PS from the loader position sensor 71, loading is started from step F301. That is, the loader driver 70 is instructed to drive the loading mechanism 40, and a series of loading operations shown in FIGS. 3 (a) → (b) → (c) → (e) is started.
Here, in step F302, the recording / reproducing controller 19 turns on the collision avoidance mode upon impact, and starts the process of FIG. 7 in parallel with the loading process of FIG.

In the process of FIG. 7, the recording / reproducing controller 19 monitors the detection signal SS from the shock sensor 73 in step F401, and determines whether or not a certain level of shock or vibration is applied to the disk drive device 18. .
While the impact collision avoidance mode is on, the impact detection in step F401 is continued.
If a large impact or vibration is detected, the recording / reproducing controller 19 advances the process to step F402, instructs the optical block servo circuit 61, and causes a collision avoidance current to flow to the focus coil of the biaxial mechanism 51b. To control. In response to an instruction from the recording / reproducing controller 19, the optical block servo circuit 61 outputs a focus drive signal for applying a collision avoidance current, and causes the collision avoidance current to flow through the focus coil by the biaxial driver 68. As a result, the objective lens 51a is maintained at the position farthest from the disk 114 within the stroke in the focus direction even by the impact or vibration applied at that time, and swings to a position where it collides with the disk 114. Will never be done.
During the period in which the collision avoidance current is applied, the process waits for a certain time to elapse in step F403, and when the certain time has elapsed, the process proceeds to step F404 to stop the application of the collision avoidance current to the focus coil. As a result, the objective lens 51a is returned to the free state, and the process returns to the impact detection process in step F401.

The recording / reproducing controller 19 continues the processing at the time of loading in FIG. 6 while continuing the processing in FIG.
That is, when the recording / reproducing controller 19 confirms in step F303 that the drive mechanism has moved to the drive-on state in FIG. 3D (that is, the completion of the disk chucking) by the operation of the loading mechanism 40, the step S304 Then, a spindle kick pulse is generated by the spindle servo circuit 62, and the rotation of the spindle motor 52 is started.
The recording / reproducing controller 19 monitors the FG pulse signal SFG in step F305 after starting the rotation of the spindle motor 52, and determines whether or not the rotation speed of the spindle motor 52 has reached a specified rotation speed.
When the rotation speed of the spindle motor 52 reaches the specified rotation speed, the process proceeds to step F306, where laser output from the pickup 51 is started, and subsequently, the collision avoidance mode at impact is turned off in step F307. That is, the process of FIG. 7 is terminated. Then, an instruction is issued to the optical block servo circuit 61 so as to continue the focus search operation.
Then, the focus servo is pulled in by the focus search, the tracking servo is turned on, and the spindle motor rotation is set by the spindle servo, so that the servo lock is completed in step F308, that is, for recording or reproduction. Assume that the initial operation is completed, and then proceed to necessary processing. For example, thereafter, seeking to the management information area of the disk 114 and reading of management data are performed, and thereafter, requested processing such as recording or reproduction of video data or the like is executed.

As described above, the collision avoidance mode at impact is turned on for the required period during the loading process of FIG. 6 and the process of FIG. 7 is executed, so that at least the disc 114 is chucked and then specified. During the period until the objective lens 51a collides with the disk 114 due to the impact at the rotational speed, that is, the impact is applied to the focus coil of the biaxial mechanism 51b even if the impact is applied. The position away from the disk 114 is maintained by the avoidance current. Therefore, even if there is an impact or vibration during the loading operation, the objective lens 51a is prevented from colliding with the disk 114.
In addition, since the collision avoidance current flows only when an impact is detected, an effect of reducing power consumption can be obtained, and since the collision avoidance current does not flow for a long time, a thermal load is applied to the focus coil. The advantage of not giving is obtained.

Next, the processing of the recording / playback controller 19 at the time of unloading will be described with reference to FIG.
When the user performs an eject operation from the operation unit 27, the system controller 11 instructs the recording / playback controller 19 to perform an unloading operation.
Then, the recording / reproducing controller 19 issues an instruction to the optical block servo circuit 61 in step F501 to turn off the focus servo and tracking servo. Subsequently, in step F502, the recording / reproducing controller 19 turns on the collision avoidance mode at impact, and starts the above-described processing of FIG. 7 in parallel with the unloading processing of FIG.
Therefore, the collision avoidance current is applied to the focus coil in response to the impact detection.

Subsequently, in step F503, the recording / reproducing controller 19 stops the laser output from the pickup 51, and instructs the spindle motor 52 to stop rotating in step F504. In response to this, the spindle servo circuit 62 generates a brake pulse for stopping the spindle rotation, and stops the rotation of the spindle motor 52 via the spindle driver 67.
In step F505, the recording / reproducing controller 19 monitors the FG pulse signal SFG to determine whether or not the rotation of the spindle motor 52 has completely stopped.
If it is determined that the rotation is completely stopped, unloading is started in step F506. That is, the loader driver 70 is instructed to cause the loading mechanism 40 to execute an unloading operation for disc ejection. Thereafter, the loading mechanism 40 sequentially shifts from the loader driver 70 to the state of FIG. 3D → (c) → (b) → (a) according to the drive signal from the loader driver 70.
After the unloading operation is started, the recording / reproducing controller 19 monitors the detection signal PS from the loader position sensor 71 in step F507, and a safe position where the disk 114 does not collide with the objective lens 51a in the unloading process. That is, it is determined whether or not it has moved to the drive-off position in FIG. If it is detected from the detection signal PS that the unloading operation has reached the drive-off state, the process proceeds to step F508, the impact collision avoidance mode is turned off, and the processing of FIG.

In the middle of the unloading process of FIG. 8, the impact collision avoidance mode is turned on for a required period and the process of FIG. 7 is executed, so that at least the rotation of the disk 114 by the spindle motor 52 is stopped. The period from the start of the operation until the disk 114 is unchucked (the period until the drive-off in FIG. 3C is reached), that is, the objective lens 51a may collide with the disk 114 due to an impact. During the period, even if an impact is applied, the objective lens 51a is maintained at a position far from the disk 114 by the collision avoidance current applied to the focus coil of the biaxial mechanism 51b. Therefore, even if there is an impact or vibration during the unloading operation, the objective lens 51a is prevented from colliding with the disk 114.
In addition, since the collision avoidance current flows only when an impact is detected, an effect of reducing power consumption can be obtained, and since the collision avoidance current does not flow for a long time, a thermal load is applied to the focus coil. The advantage of not giving is obtained.

7). Modified example.

Although the embodiment has been described above, various modifications as the present invention are conceivable.
Although the above example has been described as processing at the time of loading / unloading, the present invention can also be applied when disk rotation is started without disk insertion / ejection or when disk rotation is stopped. .
For example, in the case of a disk drive device that can be powered off while the disk is still chucked, when the power is turned on and the disk rotation drive is started, the focus search is started from the rotation start point. It is conceivable that the collision avoidance current is continuously supplied to the focus coil during the period up to or until the collision avoidance current is supplied in response to the impact detection.
Also, during the period from when recording or playback is finished and the laser or servo operation is turned off until the disk rotation is completely stopped, a collision avoidance current is continuously supplied to the focus coil, or a collision avoidance current is detected in response to impact detection. It is conceivable that

In the above example, an example of a disk drive device built in an image pickup apparatus that records video as the disk drive device 18 is given. However, a disk drive device built in or connected to a host device or personal computer as an AV system, or Various forms such as a disk drive device that performs a recording / reproducing operation alone are assumed. Of course, the disk drive apparatus of the present invention may be an audio recording / reproducing apparatus, or may be applied to a recording / reproducing apparatus for received information by wired or wireless transmission.
Further, not only a recording / reproducing apparatus but also a reproducing-only apparatus and a recording-only apparatus may be used.
Further, as a recording medium used in the recording or reproducing apparatus, the present invention can be applied even if the medium is not stored in a cartridge, and various media such as an optical disk, a magneto-optical disk, and a magnetic disk are applicable. The present invention can be realized as a disk drive device corresponding to the above.

It is a block diagram of the imaging device of an embodiment of the invention. 1 is a block diagram of a disk drive device according to an embodiment. It is explanatory drawing of each state of the loading process of embodiment. It is a flowchart of the loading process of the collision avoidance operation example I of an embodiment. It is a flowchart of the unloading process of the collision avoidance operation example I of the embodiment. It is a flowchart of the loading process of the collision avoidance operation example II of the embodiment. It is a flowchart of the process of the collision avoidance mode at the time of impact of embodiment. It is a flowchart of the unloading process of the collision avoidance operation example II of the embodiment. It is a perspective view of a cartridge disk. It is a disassembled perspective view of a cartridge disk. FIG. 6 is a bottom view of the cartridge disk in a shutter closed state. It is a bottom view of the shutter open state of the cartridge disk.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Imaging device, 11 System controller, 12 Camera part, 13 Imaging part, 14 Imaging signal processing part, 15 Camera controller, 16 Recording / reproducing part, 17 Compression encoding / decoding part, 18 Disk drive apparatus, 19 Recording / reproducing controller, 40 Loading Mechanism, 50 chucking part, 51 pickup, 52 spindle motor, 51a objective lens, 51b biaxial mechanism, 61 optical block servo circuit, 62 spindle servo circuit, 71 loader position sensor, 72 FG, 73 shock sensor, 90 cartridge disk, 100 cartridges, 114 discs

Claims (8)

Spindle means for chucking and rotating the disk recording medium;
Pick-up means for performing laser output for recording or reproduction on the disk recording medium;
A focus actuator means for controlling the movement of an objective lens as a laser output end in the pickup means in a direction in which the objective lens is in contact with or separated from the disk recording medium;
Focus servo means for driving the focus actuator to control the objective lens so as to maintain a focused state with respect to the disk recording medium;
A position where the objective lens is moved away from the disk recording medium by the focus actuator means during a period in which the laser output from the pickup means is off and the operation related to the focus servo by the focus servo means is off. Control means to be maintained in,
A disk drive device comprising:   The control means rotates at a predetermined rotational speed at least after the disk recording medium is chucked on the spindle means within a period in which the laser output is off and the operation related to the focus servo is off. 2. The disk drive device according to claim 1, wherein the objective lens is maintained at a position away from the disk recording medium during a period until the recording is performed.   The control means starts at least the operation of stopping the rotation of the disk recording medium by the spindle means within a period in which the laser output is turned off and the operation related to the focus servo is turned off. 2. The disk drive device according to claim 1, wherein the objective lens is maintained at a position away from the disk recording medium for a period until chucking of the disk recording medium to the spindle means is removed. Furthermore, it is provided with an impact sensor means for detecting that an impact has been applied,
The control means, when the impact output by the impact sensor means is detected within a period in which the laser output is turned off and the operation related to the focus servo by the focus servo means is turned off, the objective lens, 2. The disk drive apparatus according to claim 1, wherein the disk drive apparatus is maintained at a position away from the disk recording medium.   The control means rotates at a predetermined rotational speed at least after the disk recording medium is chucked on the spindle means within a period in which the laser output is off and the operation related to the focus servo is off. 5. The disk drive device according to claim 4, wherein the objective lens is maintained at a position away from the disk recording medium in accordance with the impact detection by the impact sensor means during the period until the recording is performed.   The control means starts at least the operation of stopping the rotation of the disk recording medium by the spindle means within a period in which the laser output is turned off and the operation related to the focus servo is turned off. The objective lens is maintained at a position away from the disk recording medium according to the impact detection by the impact sensor means during a period until the disk recording medium is unchucked to the spindle means. The disk drive device according to claim 4. Spindle means for chucking and rotating the disk recording medium;
Pick-up means for performing laser output for recording or reproduction on the disk recording medium;
A focus actuator means for controlling the movement of an objective lens as a laser output end in the pickup means in a direction in which the objective lens is in contact with or separated from the disk recording medium;
Focus servo means for driving the focus actuator to control the objective lens so as to maintain a focused state with respect to the disk recording medium;
As a control method of the objective lens in the disk drive device having
The laser output from the pickup means is turned off, and the focus actuator means is driven and the objective lens is moved from the disk recording medium within a period in which the operation related to the focus servo by the focus servo means is turned off. An objective lens control method, characterized in that the objective lens is maintained at a distant position. The focus actuator means is driven when it is detected that an impact has been applied to the disk drive device within a period in which the laser output is turned off and the operation related to the focus servo by the focus servo means is turned off. The objective lens control method according to claim 7, wherein the objective lens is maintained at a position away from the disk recording medium.

Images