JPH08287477A - Optical disk device - Google Patents

Abstract

PURPOSE: To provide an optical disk device capable of completely preventing destruction of a disk recording information at the time of malfunction of the focus setting. CONSTITUTION: A lens protector 12 is arranged integrally with an objective lens 11 at the position adjacent to the disk 16 and also at the inner peripheral side of the disk than the focal position 18. The focus setting operation is performed at the inner most peripheral position of the disk 16 by the operations of a linear motor 13 and an inner most peripheral position detector 14. When the dangerous state such as the objective lens coming into contact with the disk due to the malfunction of the focus setting, or the like, the position where the lens protector 12 is brought into contact with the disk, is the inner peripheral side than the focal position 18 of the objective lens 11, thereby the destruction of the recorded information is prevented even though the disk 16 is mechanically damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing system including a video disc and a digital audio.

[0002]

2. Description of the Related Art In recent years, an optical information recording system has attracted attention as a large capacity information recording medium. In such a device, a focus servo is used to keep the focus of the laser light on the recording surface of the disk. The mechanism for generating the focus error signal, which is a reference signal for operating this focus servo, is a linear focus. The range in which the error signal can be generated is extremely narrow and is only about 10 microns above and below the focal position. For this reason, at the start of the operation of the device, the objective lens is gradually moved closer to the disc from a position far away from the disc, and a focus error signal is generated, and the focus servo is turned on at the moment when the output becomes 0. Take action. However, this kind of operation is usually not a problem, but when the focus pull-in error occurs when the focus error signal is not output normally due to dirt on the lens or disc, the objective lens comes too close to the disc There is a risk that the lens may contact the disc and damage the disc or the objective lens. Therefore, some methods have been devised to prevent damage to the disc and the objective lens.

A conventional optical disk device will be described below with reference to the drawings. FIG. 4 is a block diagram of a conventional optical disk device. In FIG. 4, 41 is an objective lens, 42 is a lens protector, 43 is a linear motor, 4
4 is the innermost position detecting device, 45 is a control device, 46 is a disk, 47 is an optical head, and 42 is a lens protector.
It is arranged at the outer edge of the objective lens No. 1 integrally with the objective lens No. 1 at a position closer to the disc 46 than this, and is made of a material softer than the disc 46. The linear motor 43 can pass a current through a coil arranged in a DC magnetic circuit to move the optical head 47 to any position from the innermost circumference to the outermost circumference of the disk 46. The innermost circumferential position detecting device 44 detects that the objective lens 41 is at a position for reproducing the innermost track of the disc 46. When a focus ON signal is input to the control device 45, a current is passed through the linear motor 43 to move the optical head 47 in the inner circumferential direction, and the inner position detecting device 44 44 and the objective lens 41 41
When it is detected that the innermost track of the disk No. 6 is to be reproduced, the focus pull-in operation is performed.

The operation of the optical disk device configured as described above will be described below.

When a focus ON signal is input to the control device 45, the control device 45 applies current to the linear motor 43 to move the optical head 47 in the inner peripheral direction, and the innermost position detecting device 44 operates. When it is detected that the objective lens 41 is at the position for reproducing the innermost track of the disc 46, the focus pull-in operation is performed. If there is a risk of the objective lens coming into contact with the disc and damaging the disc or the objective lens at the time of focus pull-in malfunction such as when the focus error signal is not output normally due to dirt on the lens or disc, etc. 41 because the lens protector contacts the 46 discs before the 41 objective lens
Since the objective lens of No. 1 does not contact the disc of 46, damage of the objective lens can be prevented. Further, since the lens protector 42 is made of a material softer than the disc 46, the disc is less damaged.

[0006]

However, in the above-mentioned structure, the recorded information is destroyed due to the damage of the disk when the lens protector collides strongly with the disk or when the lens protector and the disk have dust or the like attached thereto. Had an unavoidable problem.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an optical disk device capable of completely preventing the destruction of information recorded on the disk and the damage of the objective lens at the time of malfunction of focus pull-in. .

[0008]

In order to achieve this object, the optical disk apparatus of the present invention comprises a transfer means for transferring an objective lens of an optical pickup in a radial direction of the disk, and the objective lens in the radial direction of the disk. A detection mechanism for detecting that the innermost circumference or the outermost circumference is positioned for recording / reproducing, and a projection integrally mounted with the objective lens in the vicinity of the objective lens, and the objective lens is close to the disc When moving in the direction, the protrusion,
The protrusion is arranged so as to prevent contact between the disc and the objective lens by contacting the disc before the objective lens, and the position where the protrusion contacts the disc is on the disc of the objective lens. It is arranged such that when it is pulled in at the innermost circumference from the focal point position, the disk is placed at a certain distance on the inner circumference side of the disk, and when it is drawn at the outermost circumference, it is located at the outer circumference side.

[0009]

According to the present invention, the lens protector comes into contact with the disc outside the recording area of the disc when the focus pull-in malfunction occurs by performing the focus pull-in operation at the innermost or outermost position of the disc. It is possible to obtain an optical disk device capable of preventing destruction of recorded information even when the disk is damaged.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk device according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an optical disk device according to the first embodiment of the present invention. 11 in FIG.
Is an objective lens, 12 is a lens protector, 13 is a linear motor, 14 is an innermost position detecting device, 15 is a control device,
16 is a disk, 17 is an optical head, 18 is a focus position,
Twelve lens protectors are mounted integrally with the eleven objective lenses at positions closer to the sixteen discs,
In the case of this embodiment in which the focus is drawn in the innermost circumference of the focus position 18 of the 11 objective lenses on the recording surface of the disk, the disk is arranged so as to contact the disk on the inner circumference side. The linear motor 13 can move the optical heads 17 to any position from the innermost circumference to the outermost circumference of the 16 disks. The innermost circumferential position detecting device 14 detects that the 11 objective lenses are at the position for reproducing the innermost track of 16 discs. When a focus ON signal is input, the control device 15 causes a current to flow in the linear motor 13 to move the optical head 17 in the inner circumferential direction,
When the inner peripheral position detecting device 4 detects that the 11 objective lens is at the position for reproducing the innermost track of the 16 disc, the objective lens is moved up and down at that position to perform the focus pull-in operation.

The operation of the optical disk device configured as described above will be described below.

When a focus ON signal is input to the control device of 15, the control device of 15 applies a current to the linear motor of 13 to move the optical head of 17 in the inner peripheral direction, and the innermost peripheral position detecting device of 14 operates. When it is detected that the 11th objective lens is at the position for reproducing the innermost track of the 16th disc, the focus pull-in operation is performed at that position. 12 lenses if there is a risk of the objective lens contacting the disc and damaging the disc or the objective lens at the time of malfunction of focus pull-in, such as when the focus error signal is not output properly due to dirt on the lens or disc, etc. Since the protector contacts the 16 discs before the 11 objective lenses, the 11 objective lens does not contact the 16 discs and damage to the objective lens is prevented. Further, the position where the 12 lens protector contacts the disc is on the inner circumference side of the focus position 18 on the 16 disc of the 11 objective lens, and the focus pull-in operation is performed at the innermost circumference of the 16 discs. 12 lens protectors for
The disc is contacted with 16 discs in a region which is not used for recording / reproducing the signal on the inner circumference side of the region where the signal is recorded. Therefore, even if the 12 lens protectors and the 16 discs come into contact with each other due to the focus pull-in malfunction and the 16 discs are mechanically damaged, the recorded information can be prevented from being destroyed. In the above embodiment, the lens protector 12
The lens protector is arranged on the outer peripheral side of the objective lens and is arranged on the inner peripheral side with respect to the objective lens in the reverse direction. The combination of is also possible.

As described above, according to this embodiment, the transfer means for transferring the objective lens of the optical pickup in the radial direction of the disc and the objective lens record the innermost circumference or the outermost circumference of the disc in the radial direction of the disc. A detection mechanism for detecting that the objective lens is located at a re-repositioning position, and a projection integrally attached to the objective lens in the vicinity of the objective lens, and when the objective lens moves in the direction of approaching the disk, the projection is The protrusion is arranged so as to prevent contact between the disc and the objective lens by contacting the disc before the objective lens, and the position where the protrusion contacts the disc is on the disc of the objective lens. By arranging them so that they are separated from the focus position by a certain distance on the inner or outer circumference side of the disc, Destruction and damage of the objective lens of Okasu pull the disc recording information at the time of malfunction can get an optical disk apparatus capable of completely preventing.

An optical disk device according to a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the configuration of an optical disk device according to the second embodiment of the present invention. In FIG. 2, 2
1 is an objective lens, 22 is a lens protector, 23 is a linear motor, 26 is a disk, 27 is an optical head, 28 is a focal position, and the above is the same as the configuration of FIG.

1 differs from the configuration of FIG. 1 in that in FIG. 14, 14 innermost circumferential position detecting devices are provided to detect the innermost circumferential position, whereas in the present embodiment, the innermost circumferential position detecting device is particularly used. Instead, the innermost peripheral stopper 24 is provided, and the controller 25 supplies a current to the linear motor for a time 23 sufficient for the optical head 27 to move to the position of the innermost peripheral stopper after the focus ON command. By continuing to flow, 27 optical heads are moved and pressed against the innermost stopper of the upper 24,
Thereby, it is detected that 27 optical heads are at the innermost peripheral position, and then the focus pull-in operation is performed in that state.

The operation of the optical disk device configured as described above will be described below. When the focus ON signal is input to the control device of 25, the control device of 25 keeps applying the current to the linear motor of 23 for a time sufficient for the optical head of 27 to move to the position of the innermost circumferential stopper, and thereby the light of 27 is generated. After the head is moved, it is pressed against the innermost peripheral stopper 24, thereby detecting that the optical head 27 is at the innermost peripheral position, and then the focus pull-in operation is performed in that state. 22 lenses if there is a risk that the objective lens may come into contact with the disc and damage the disc or the objective lens when the focus pull-in malfunction occurs when the focus error signal is not output properly due to dirt on the lens or the disc, etc. Since the protector contacts the 26 discs before the 21 objective lens, the 21 objective lens is
The objective lens is prevented from being damaged because it does not touch the disk. Further, the position where the lens protector 22 contacts the disc is on the inner circumference side of the focal position 28 on the disc of the objective lens 26 of 21 and the focus pull-in operation is performed at the innermost circumference of the disc of 26. Therefore, the lens protector 22 comes into contact with the disc 26 in an area which is not used for recording / reproducing a signal on the inner circumference side of the area where the signal is recorded. Therefore, even if the lens protector 22 and the disk 26 are brought into contact with each other by the focus pull-in malfunction and the disk 26 is mechanically damaged, the recorded information can be prevented from being destroyed.

As described above, according to this embodiment, the transfer means for transferring the objective lens of the optical pickup in the radial direction of the disc and the objective lens record the innermost circumference or the outermost circumference of the disc in the radial direction of the disc. A detection mechanism for detecting that the objective lens is located at a re-repositioning position, and a projection integrally attached to the objective lens in the vicinity of the objective lens, and when the objective lens moves in the direction of approaching the disk, the projection is The protrusion is arranged so as to prevent contact between the disc and the objective lens by contacting the disc before the objective lens, and the position where the protrusion contacts the disc is on the disc of the objective lens. By arranging them so that they are separated from the focus position by a certain distance on the inner or outer circumference side of the disc, Destruction and damage of the objective lens of Okasu pull the disc recording information at the time of malfunction can get an optical disk apparatus capable of completely preventing.

In this embodiment, as in the first embodiment, the projection is provided on the inner peripheral side of the objective lens and the focus is pulled in at the innermost peripheral position. However, the projection is provided on the outer peripheral side of the objective lens. Alternatively, the focus pull-in may be performed at the outermost position.

An optical disk device according to a third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the configuration of an optical disk device according to the third embodiment of the present invention. 31 in FIG.
Is an objective lens, 33 is a linear motor, 34 is an innermost peripheral position detecting device, 35 is a control device, 36 is a disk, 37 is an optical head, 38 is a focal position, and these are the same as the configuration of FIG. .

1 differs from the configuration of FIG. 1 in that the lens protector has a shape with a protrusion in part in FIG. 1, but in the present embodiment the entire upper surface is inclined and the inner side of the disc is closer to the outer side than the outer side. The point is that the shape is close to.

When a focus ON signal is input to the control device 35, the control device 35 applies a current to the linear motor 33 to move the optical head 37 in the inner peripheral direction, so that the innermost position detecting device 34 operates. When it is detected that the objective lens 31 is at the position for reproducing the innermost track of the disc 36, the focus pull-in operation is performed at that position. 32 lenses if there is a risk of the objective lens coming into contact with the disc and damaging the disc or the objective lens at the time of focus pull-in malfunction such as when the focus error signal is not output properly due to dirt on the lens or disc, etc. Since the protector contacts the disc of 36 before the objective lens of 31, the objective lens of 31 does not contact the disc of 36 and damage to the objective lens is prevented. Further, since the upper surface of the lens protector 32 is inclined and the inner circumference side of the disk is closer to the disk than the outer circumference side, the position where this comes into contact with the disk is the focus position 38 on the disk of the objective lens 36 of 31. Since the focus pull-in operation is performed on the innermost side of the disc and the focus pull-in operation is performed on the innermost side of the 36 disc, the 32 lens protector is not used for recording / reproducing the signal on the inner side of the region where the signal is recorded. 3 in the area
6 will come into contact with the disc. Therefore, due to a malfunction of focus pull-in, 32 lens protectors and 36
It is possible to prevent the recorded information from being destroyed even if the discs of 36 contact and the discs of 36 are mechanically damaged.

As the material of the lens protector, it is desirable to use a material having a hardness as low as possible as compared with the disc material, and to have the functions of protecting the lens and preventing scratches on the disc surface. Silicon or butyl rubber or resin, or a molded product of resin or rubber that is surface-treated with leather or cloth may be used.

The objective lens and the lens protector may be integrally formed when a plastic aspherical lens is used.

As described above, according to this embodiment, the transfer means for transferring the objective lens of the optical pickup in the radial direction of the disc and the objective lens record the innermost or outermost periphery of the disc in the radial direction of the disc. A detection mechanism for detecting that the objective lens is located at a re-repositioning position, and a projection integrally attached to the objective lens in the vicinity of the objective lens, and when the objective lens moves in the direction of approaching the disk, the projection is The protrusion is arranged so as to prevent contact between the disc and the objective lens by contacting the disc before the objective lens, and the position where the protrusion contacts the disc is on the disc of the objective lens. By arranging them so that they are separated from the focus position by a certain distance on the inner or outer circumference side of the disc, Destruction and damage of the objective lens of Okasu pull the disc recording information at the time of malfunction can get an optical disk apparatus capable of completely preventing.

Although the above embodiments have been described by using the optical disk device, it is within the scope of the present invention to apply to a similar device using a recording medium of other shape such as a card-shaped medium. In the case of the above-mentioned medium which is not disk-shaped, the inner and outer circumferences do not exist, but by arranging the lens protector at a position outside the information recording area, the same configuration and effect can be realized.

[0029]

As described above, in the optical disk device of the present invention, the transfer means for transferring the objective lens of the optical pickup in the radial direction of the disk, and the objective lens in the radial direction of the disk, the innermost circumference of the disk or A direction in which the objective lens approaches the disc with a simple structure including a detection mechanism that detects that the outermost circumference is located at a position where the recording / reproduction is performed, and a projection that is integrally attached to the objective lens in the vicinity of the objective lens. Even if the objective lens collides with the disc due to the movement of the disc and the objective lens collides with the disc, the protrusion contacts the portion other than the information recording area of the disc before the objective lens, so that the disc and the objective lens are contacted. The projection is arranged so as to prevent contact of the lens, and the position where the projection contacts the disk is the objective lens. By arranging them so as to be separated from the focal position on the disc by a certain distance on the inner side or the outer side of the disc, the destruction of the recorded information on the disc and the damage of the objective lens at the time of malfunction of focus pull-in are completely prevented. Thus, it is possible to obtain an optical disc device which can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical disk device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an optical disc device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of an optical disk device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a conventional optical disc device.

[Explanation of symbols]

 11 Objective Lens 12 Lens Protector 13 Linear Motor 14 Innermost Circumference Position Detection Device 15 Control Device 16 Disk 17 Optical Head 18 Focus Position 21 Objective Lens 22 Lens Protector 23 Linear Motor 24 Innermost Circumference Stopper 25 Control Device 26 Disc 27 Optical Head 28 Focus position 31 Objective lens 32 Lens protector 33 Linear motor 34 Innermost position detection device 35 Control device 36 Disc 37 Optical head 38 Focus position 41 Objective lens 42 Lens protector 43 Linear motor 44 Innermost position detection device 45 Control device 46 Disc 47 optical head

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location G11B 19/14 501 G11B 19/14 501F

Claims (4)

[Claims] 1. In an optical disk device for recording or reproducing on a disk, a transfer means for transferring an objective lens of an optical pickup in the radial direction of the disk, and the objective lens is the innermost part of the disk in the radial direction of the disk. Stop means for stopping at the circumferential position, and a projection integrally attached to the objective lens in the vicinity of the objective lens are provided, and when the objective lens moves in the direction of approaching the disc, the projection is provided before the objective lens. The protrusion is arranged so as to prevent contact between the disc and the objective lens by coming into contact with the disc, and the position where the protrusion comes into contact with the disc is always greater than the focal position of the objective lens on the disc. An optical disc characterized by being arranged on the inner circumference side of the disc so as to be separated by a certain distance. Location. 2. The optical disk device according to claim 1, wherein the stopping means includes an innermost peripheral position detecting means. 3. An optical disk device for recording or reproducing on a disk, wherein the transfer means transfers an objective lens of an optical pickup in the radial direction of the disk, and the objective lens is the outermost circumference of the disk in the radial direction of the disk. A stop means for stopping at a position and a projection integrally attached to the objective lens in the vicinity of the objective lens are provided, and when the objective lens moves in the direction of approaching the disc, the projection is provided before the objective lens. The protrusion is arranged so as to prevent contact between the disc and the objective lens by coming into contact with the disc, and the position where the protrusion comes into contact with the disc is always the disc from the focal position of the objective lens on the disc. An optical disc characterized in that the optical discs are arranged on the outer peripheral side of the optical disc so as to be separated by a certain distance. Location. 4. The optical disk device according to claim 1, wherein the stopping means includes an outermost peripheral position detecting means.