JP2003045060A - Optical head driving device and optical information processing device - Google Patents

Abstract

(57) [Problem] To provide a shutter in a recording / reproducing apparatus in which the distance between an optical lens and a recording medium is short. An optical head device including an objective lens.
The optical head device 10 is fixedly provided on the support member 2 and is moved by a driving force transmitted from the head drive motor to the slide rack 4 via the gear 3.
Is driven along the radius of the recording medium. Further, the support member 2 is provided with a reference shaft 5 at a portion between the optical head device 10 and the slide rack 4, and a fitting portion 6 is provided at a portion opposite to the reference shaft 5 via the optical head device 10. Can be When the support member 2 is moved to a predetermined position corresponding to, for example, the innermost circumference of the recording medium by driving the slide rack 4, the fitting portion 6 provided at the end of the support member 2 moves to an arbitrary tilt cam. 7 is fitted. Further, a shutter 8 is provided coaxially with the tilt cam 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD, MD, DV.
The present invention relates to an optical head driving device and an optical information processing device suitable for use in a recording / reproducing device for an optical recording disk medium such as D. More specifically, it is possible to provide a shutter for protecting the optical lens in an apparatus in which an optical lens for recording / reproducing an optical signal and a recording medium are close to each other.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for an optical recording disk medium such as a CD, MD or DVD, an optical lens for recording / reproducing an optical signal on / from the recording medium is provided. Since such an optical lens is usually provided to face the recording medium, the optical lens is exposed to the outside when the recording medium is ejected, for example. Therefore, dust or the like may be attached to the surface of the optical lens, and the recording or reproduction of the optical signal may be hindered by the contamination of the optical lens.

Therefore, in the conventional recording / reproducing apparatus of this type, a shutter for covering the surface of the optical lens is provided when recording / reproducing is not performed so that dust or the like does not adhere to the surface of the optical lens. Is being done.

That is, in FIG. 7, first, A of FIG. 7 shows the appearance of the optical head device 60. This optical head device 6
At 0, an objective lens 61 as an optical lens and a biaxial actuator 62 for driving the objective lens 61 are provided. The biaxial actuator 62 controls and drives the objective lens 61 in the focus and track directions, and the entire optical head device 60 is moved by the slide rack 63 along the radius of the recording medium (not shown). Is.

Further, FIG. 7B shows the optical head device 60.
1 shows a configuration of an optical head driving device using the. In FIG. 7B, the rotation of the spindle motor 65 provided on the lower surface of the chassis 64 is transmitted to the turntable 66 via the rotation shaft, and the recording medium (not shown) is rotationally driven. The rotation of the head drive motor 67 is transmitted to the slide rack 63 via a gear, and the slide rack 63 moves the optical head device 60 along the radius of the recording medium (not shown).

In this device, a shutter 68 is provided on the upper surface of the optical head device 60. The shutter 68 opens the objective lens 61 as shown in the drawing during operation such as recording / reproducing, and when not in operation, for example, The optical head device 60 is configured to be rotated in association with the movement of the optical head device 60 to a position corresponding to the innermost circumference of a recording medium (not shown), and the objective lens 61 is covered by the shutter 68. is there.

Thus, according to this apparatus, since the objective lens 61 is covered by the shutter 68 when recording / reproducing is not performed, dust or the like adheres to the surface of the objective lens 61 as an optical lens, and the objective lens 61. 6
This is to prevent 1 from being damaged.

However, due to the shortening of the wavelength of the optical signal and the thinning of the device, the distance (working distance) between the optical lens and the recording medium becomes closer, and the distance which was 2.0 mm or more in the conventional CD recording / reproducing apparatus. In a thin DVD recording / reproducing apparatus, the distance is about 0.8 mm. Therefore, in the recording / reproducing apparatus in which the optical lens and the recording medium are close to each other as described above, it is difficult to insert the shutter between the optical lens and the recording medium as it is.

In addition, in the recording / reproducing apparatus in which the working distance is close to each other as described above, there are many opportunities for the optical lens and the recording medium to come into contact with each other or collide with each other due to vibration or the like. The risk of scratches on the lens also increases. Therefore, a means for preventing the interference between the optical lens and the recording medium when not operating is also required.

[0010]

This application has been made in view of such a point, and a problem to be solved is, for example, recording / reproducing in which a distance between an optical lens and a recording medium is close. In the apparatus, it is difficult to provide a shutter between the optical lens and the recording medium, and a means for preventing the interference between the optical lens and the recording medium is required when the apparatus is not operating. Then, those problems could not be solved easily.

[0011]

Therefore, in the present invention, an optical head device including an optical lens is tilted at a predetermined position, and a shutter is inserted between the optical lens of the tilted optical head device and a recording medium. According to this, by tilting the optical head device, the gap between the optical lens and the recording medium can be expanded to facilitate the insertion of the shutter. Even in a recording / reproducing apparatus in which the optical lens and the recording medium are close to each other, the shutter can be installed.

[0012]

That is, according to the present invention, between an optical lens, a mechanism for inclining an optical head device including the optical lens at a predetermined position, and an optical lens of the inclined optical head device and a recording medium. A mechanism for inserting a shutter is provided.

Further, in the present invention, an optical lens,
A mechanism for tilting the optical head device including the optical lens at a predetermined position and a mechanism for inserting a shutter between the optical lens of the tilted optical head device and the recording medium are provided.

The present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an optical head driving device when the present invention is applied to a recording / reproducing apparatus in which an optical lens and a recording medium are close to each other. It is a block diagram which shows the principal part of a form.

In FIG. 1, an optical head device 10 including an objective lens 1 as an optical lens is fixedly provided on a supporting member 2. Then, the supporting member 2 is moved in the direction perpendicular to the drawing surface of the drawing by the driving force transmitted from the head driving motor (not shown) to the slide rack 4 via the gear 3 to thereby obtain the objective lens. The optical head device 10 including the optical disc 1 is driven along the radius of the recording medium (not shown).

Further, the support member 2 is provided with a reference shaft 5 at a portion between the optical head device 10 and the slide rack 4, and the optical head device 10 is provided from the reference shaft 5.
The fitting portion 6 is provided on the opposite side through the. Then, when the support member 2 is moved to a predetermined position corresponding to the innermost circumference of the recording medium (not shown) by driving the slide rack 4, the fitting provided at the end of the support member 2 is performed. The portion 6 is configured to be fitted with an arbitrary tilt cam 7.

Here, the tilt cam 7 has, for example, a shape in which upper and lower cam plates are connected by inclined portions as shown in FIG. Therefore, when the tilt cam 7 is fitted into the fitting portion 6, the fitting portion 6 is moved up and down by the rotation of the tilt cam 7, and the support member 2 is tilted with the reference shaft 5 as the center of rotation. . Further, a shutter 8 is provided coaxially with the tilt cam 7. The structure of the shutter 8 provided coaxially with the tilt cam 7 is shown in FIG.

That is, in this apparatus, the objective lens 1
When the tilt cam 7 is rotated in a state where the optical head device 10 including the lens is moved to a predetermined position, the support member 2 is tilted about the reference axis 5 and the optical head device 10 including the objective lens 1 is also tilted. Thus, the objective lens 1 is separated from the recording medium (not shown) provided above it. Then, in this state, the shutter 8 provided coaxially with the tilt cam 7 is rotated, and the shutter 8 is inserted between the objective lens 1 and the recording medium (not shown).

Therefore, in this embodiment, the optical head device including the optical lens is tilted at a predetermined position, and a mechanism for inserting a shutter between the optical lens of the tilted optical head device and the recording medium is provided. Therefore, by tilting the optical head device, the gap between the optical lens and the recording medium can be expanded to facilitate the insertion of the shutter. For example, recording / reproduction in which the optical lens and the recording medium are close to each other. The device can also allow installation of shutters.

Thus, for example, in a recording / reproducing apparatus in which the optical lens and the recording medium are close to each other, it is difficult to provide a shutter between the optical lens and the recording medium. A means for preventing interference with the medium is also required, but these problems that cannot be solved by the conventional device can be easily solved by the present invention.

Further, a specific structure for driving the tilt cam 7 to rotate will be described below. First, FIG. 4 utilizes the rotation of the spindle motor as a means for rotationally driving the tilt cam 7. In FIG. 4, the optical head device 10 is moved, for example, by a head drive motor 20 in the left-right direction on the drawing surface of the drawing. This direction is the direction driven along the radius of the recording medium (not shown).

The optical head device 10 is driven by this driving.
When the optical head device 10 is moved to a position corresponding to the innermost circumference of the recording medium (not shown), the movement of the optical head device 10 presses the portion of the gear arm 21 indicated by the symbol a. By this pressing, the gear arm 21 is rotated around the rotation shaft 22, and the gear 23 axially supported by the gear arm 21 is coupled to the motor shaft 24 of the spindle motor (not shown).

Further, the gear 23 has the same gear arm 2
The gear 25 pivotally supported on 1 is connected. Then, by rotating the gear arm 21 about the rotation shaft 22,
The gear 25 is coupled to a tilt cam gear 26 provided on the rotating shaft of the tilt cam 7 (not shown). The spring 27 is for returning the gear arm 21 to the original position when the pressing on the portion indicated by the symbol a is released.

In this way, when the optical head device 10 reaches the position corresponding to the innermost circumference of the recording medium (not shown), the motor shaft 24 of the spindle motor is rotated by the gears 23, 2.
It is connected to the tilt cam gear 26 via 5. By the rotation of the tilt cam gear 26, the tilt cam 7 provided on the same rotation shaft is rotated, the optical head device 10 including the objective lens is tilted, and the shutter 8 is provided between the objective lens and the recording medium (not shown). A drive for inserting (not shown) is performed.

Further, in FIG. 5, the driving force of the head drive motor 20 is used as a means for rotationally driving the tilt cam 7. In FIG. 5, when the optical head device 10 reaches the position corresponding to the innermost circumference of the recording medium (not shown), the arm 3 is moved by the movement of the optical head device 10.
The portion indicated by reference numeral b at one end of 1 is pressed. By this pressing, the arm 31 is rotated around the rotation shaft 32.

Further, by this rotation, the slide rack 33 connected to the other end of the arm 31 is driven as shown by the arrow c. By driving the slide rack 33, the combined tilt cam 7 (not shown)
The tilt cam gear 34 provided on the rotation shaft of the is rotated. The spring 35 is for returning the arm 31 to the original position when the pressing on the portion indicated by the symbol b is released.

In this way, when the optical head device 10 reaches the position corresponding to the innermost circumference of the recording medium (not shown), the arm 31 is rotated, and the tilt cam gear 34 is rotated by this rotation. It And this tilt cam gear 3
Tilt cam 7 provided on the same rotary shaft by rotation of 4
Is rotated, the optical head device 10 including the objective lens is tilted, and a drive for inserting a shutter 8 (not shown) between the objective lens and a recording medium (not shown) is performed.

Thus, according to the above-described optical head drive device, the optical lens, the mechanism for inclining the optical head device including the optical lens at a predetermined position, and the optical lens of the inclined optical head device and the recording medium are provided. By providing a mechanism for inserting a shutter in the optical head device, the gap between the optical lens and the recording medium is expanded by inclining the optical head device.
The shutter can be easily inserted, and the shutter can be installed even in a recording / reproducing apparatus in which the optical lens and the recording medium are close to each other.

Further, according to the present invention, an optical information processing apparatus can be constructed by using the above-mentioned optical head driving device. That is, FIG. 6 shows a schematic configuration of an embodiment of the optical information processing apparatus according to the present invention.
In FIG. 6, the above-described optical head driving device 10 is provided for the recording disk 100, and a light beam from the optical head driving device 10 is irradiated to record and / or reproduce an information signal.

On the other hand, this recording disk 100 is rotationally driven by a spindle motor 102 driven according to a control signal from a system control device 101 so that the linear velocity becomes constant, for example. Also, the system control device 1
The head drive motor 20 driven according to the control signal from 01 moves the optical beam from the optical head drive device 10 so that the light beam is irradiated to a desired position on the recording disk 100.

Then, for example, an information signal from the input terminal 103 is supplied to the light beam drive detection circuit 105 through the recording / reproduction circuit 104, and the light beam output from the optical head drive device 10 is output in accordance with the signal from the drive detection circuit 105. By being controlled, the information signal from the input terminal 103 is recorded on the recording disc 100. Further, the drive detection circuit 105 detects the information signal recorded on the recording disc 100, and the detected information signal is taken out to the output terminal 106 through the recording / reproducing circuit 104.

At the same time, the drive detection circuit 105 detects error signals of tracking and focusing of the light beam, and these error signals are supplied to the optical head driving device 10 through the servo circuit 107 to control tracking and / or focusing. Drive is performed. An operation signal from the operation panel 108 is sent to the system controller 10
1, the optical head drive device 10 is moved to a desired recording position or reproducing position.

In this optical information processing apparatus, an arbitrary driving means 109 is provided, and the tilt cam 7 is rotated by the arbitrary driving means 109 in a state where the above-mentioned optical lens driving device 10 is moved to a predetermined position. . As a result, the optical lens driving device 10 is tilted, the objective lens is separated from the recording medium 100 provided on the upper side thereof, and the shutter 8 provided coaxially with the tilt cam 7 is rotated to rotate the objective lens 1 and the recording medium 100. The shutter 8 is inserted in between.

Thus, according to the above-mentioned optical information processing apparatus, the optical lens, the mechanism for tilting the optical head device including the optical lens at a predetermined position, the optical lens of the tilted optical head device, and the recording medium. By providing a mechanism for inserting a shutter between them, the gap between the optical lens and the recording medium is expanded by tilting the optical head device,
The shutter can be easily inserted, and the shutter can be installed even in a recording / reproducing apparatus in which the optical lens and the recording medium are close to each other.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.

[0036]

Therefore, according to the first aspect of the invention, the optical head device including the optical lens is tilted at a predetermined position, and the shutter is inserted between the optical lens of the tilted optical head device and the recording medium. By providing the mechanism, it is possible to widen the gap between the optical lens and the recording medium by inclining the optical head device and facilitate the insertion of the shutter, for example, the distance between the optical lens and the recording medium. The shutter can be installed even in a recording / reproducing device that is close to the device.

According to the second aspect of the invention, the shutter can be inserted well by driving the mechanism for inserting the shutter linked to the driving of the mechanism for inclining.

According to the third aspect of the present invention, the mechanism for tilting the optical head device in association with the fact that the optical head device reaches a predetermined position is driven, so that the optical head device can be tilted well. It is possible.

Further, according to the invention of claim 4, the tilted position of the optical head device corresponds to the innermost circumference of the recording medium, so that the optical head device can be well protected when not operating. Is what you can do.

Further, according to the invention of claim 5, the optical head device including the optical lens is tilted at a predetermined position, and a shutter is inserted between the optical lens of the tilted optical head device and the recording medium. Since the optical head device is tilted, the gap between the optical lens and the recording medium can be expanded to facilitate the insertion of the shutter. For example, the distance between the optical lens and the recording medium can be reduced. It is possible to install the shutter even in the recording / reproducing apparatus that is provided.

According to the invention of claim 6, the shutter can be inserted well by driving the mechanism for inserting the shutter linked to the driving of the mechanism for tilting.

Further, according to the invention of claim 7, the mechanism for inclining the optical head device in association with the fact that the optical head device reaches a predetermined position is driven, whereby the optical head device can be favorably tilted. It is possible.

According to the eighth aspect of the invention, since the tilted position of the optical head device corresponds to the innermost circumference of the recording medium, the optical head device can be well protected when not operating. Is what you can do.

As a result, for example, in a recording / reproducing apparatus in which the optical lens and the recording medium are close to each other, it is difficult to provide a shutter between the optical lens and the recording medium. A means for preventing interference with the medium is also required, but these problems that cannot be solved by the conventional device can be easily solved by the present invention.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of an embodiment of an optical head drive device to which the present invention is applied.

FIG. 2 is a diagram for explaining a configuration of a main part thereof.

FIG. 3 is a diagram for explaining a configuration of a main part thereof.

FIG. 4 is a diagram for explaining the explanation.

FIG. 5 is a diagram for explaining the explanation.

FIG. 6 is a configuration diagram showing an embodiment of an optical information processing apparatus to which the present invention has been applied.

FIG. 7 is a configuration diagram of a conventional optical head driving device.

[Explanation of symbols]

10 ... Optical head device, 1 ... Objective lens, 2 ... Support member, 3 ... Gear, 4 ... Slide rack, 5 ... Reference axis, 6 ...
Fitting part, 7 ... Tilt cam, 8 ... Shutter

Claims (8)

[Claims] 1. An optical lens, a mechanism for tilting an optical head device including the optical lens at a predetermined position, and a shutter inserted between the optical lens of the tilted optical head device and the recording medium. An optical head drive device comprising a mechanism. 2. The optical head driving device according to claim 1, wherein a mechanism for inserting the shutter is driven in association with driving of the tilting mechanism. 3. The optical head drive device according to claim 1, wherein the mechanism for inclining is driven by linking when the optical head device reaches a predetermined position. 4. The optical head driving device according to claim 1, wherein the tilted position of the optical head device is a position corresponding to the innermost circumference of the recording medium. 5. An optical lens, a mechanism for tilting an optical head device including the optical lens at a predetermined position, and a shutter inserted between the optical lens of the tilted optical head device and the recording medium. An optical information processing device comprising a mechanism. 6. The optical information processing apparatus according to claim 5, wherein a mechanism for inserting the shutter is driven in linkage with driving of the tilting mechanism. 7. The optical information processing apparatus according to claim 5, wherein the tilting mechanism is driven in association with the fact that the optical head device has reached a predetermined position. 8. The optical information processing apparatus according to claim 5, wherein the tilted position of the optical head device is a position corresponding to the innermost circumference of the recording medium.