JP2706297B2 - Optical information recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus, and more particularly, to an optical information recording / reproducing apparatus that reciprocally scans a light spot along a track on a card-shaped recording medium so that the light spot is recorded on the recording medium The present invention relates to an optical information recording / reproducing apparatus for recording and / or reproducing information in / from a recording area.

[Conventional technology]

Conventionally, information is recorded using light, and the form of a medium from which the recorded information is read is a disk shape, a card shape,
Various types such as a tape shape are known. Among them, a card-shaped optical information recording medium (hereinafter, referred to as an optical card) is expected to be in great demand as a small, light-weight medium having a large storage capacity that is easy to carry.

FIG. 3 (A) is a schematic plan view of a drive section of an optical information recording / reproducing apparatus using such an optical card, and FIG. 3 (B).
FIG. 4 is a front view of the optical card, and FIG. 4 is a schematic view of an optical card format for explaining the operation of the conventional example.

3A and 3B, the optical card 1 is fixed to a shuttle 2, and the shuttle 2 is fixed to a belt 3. The belt 3 is supported by pulleys 4a and 4b, and the pulley 4a is rotated by a DC motor 5. Therefore, by reversing the rotation of the motor 5, the shuttle 2 and the optical card 1 can reciprocate in the x-axis direction.

An optical head 6 is provided above the optical card 1,
The optical head 6 movably holds the optical system 7. The optical system 7 is slightly moved in the y-axis direction by an optical system driving device (not shown), and the light beam 8 condensed by the optical system 7 forms a light spot on the optical card 1 as described later. . Therefore, the optical system driving device causes the light spot to slightly move in the y-axis direction, and performs tracking control for causing the light spot to follow the track. Of course, focusing control is also performed by the optical system driving device,
The description is omitted.

A ball screw 9 penetrates the optical head 6, and the ball screw 9
Are rotated by the pulse motor 10. Therefore, by applying a desired pulse to the pulse motor 10 to control the rotation direction and the rotation angle, the optical head 6 can be moved a desired distance in the y-axis direction.

Next, the operation of the conventional optical information recording / reproducing apparatus will be described with reference to FIG.

In FIG. 1, the optical card 1 is provided with a recording area a and a track jump area (b, c), and tracking tracks T _{1 to} T _n are arranged at intervals of a distance yt.

Next, the operation of a conventional optical information recording / reproducing apparatus using the optical card 1 having such a preformat will be described.

First, in the recording area a, the light spots S ₁ and S ₃ formed by the optical system 7 are, for example, tracks T ₁ and
Irradiated onto T _3, the tracking control is performed by utilizing the reflected light. The light spot S ₂ irradiates a data track which is an area between the tracks T ₁ and T ₂ , forms a pit by increasing the power of the light beam 8 during recording, and is formed during reproduction. The pits are illuminated with low power and the information is reproduced from the reflected light. At that time, in order to tracking control on the basis of the light spot S ₁ and S ₃ is being performed, the light spot S ₂ is always scans a predetermined position of the data track, accurate recording or reproduction is performed. The arrows shown in the light spots in the figure indicate that when the optical card 1 moves in the negative x-axis direction due to the rotation of the motor 5, the spot relatively moves in the positive x-axis direction.

Next, the light spot is the track jump area (b, c)
, The optical system 7 slightly moves in the positive direction of the y-axis by the optical system driving device, whereby the light spot jumps in the positive direction of the y-axis by the distance yt. Thus, light spots S ₁ and S ₃ are adjacent to tracks T ₂ and
To move on to the T _3. Around this, the motor 5 is reversed, and the light spot relatively moves in the negative direction of the x-axis. Thus, the recording or reproducing operation of the adjacent data track is started. In the same manner, scanning of adjacent tracks is sequentially performed in the same manner.

By such a track jump operation and the relative movement operation of the optical head 6 in the x-axis direction and the y-axis direction by the motor 5 and the pulse motor 10, the light spot can access a desired track in the recording area a. It can record or reproduce information.

However, there is actually an error in the processing accuracy, so that the moving direction of the optical card 1 and the tracks T _{1 to} T _n
May not be parallel. Optical card 1 in this case
X-axis moving direction indicated by the broken line in represents the moving direction of the optical head 6 and the optical system 7 in the y-axis shown in broken lines, the skew angle formed between the x axis and the track T ₁ through T _n and theta _s (See FIG. 4).

When the skew angle theta _s are present, when the light spot is moved relative to the optical system driving device moves the optical system 7 in the positive direction of the y-axis in an attempt to track the light spot to the track. However, the movable range of the optical system 7 (± Ymax)
Above that range, the light spot deviates from the track and tracking control becomes impossible. Therefore, before the tracking control becomes impossible, the pulse motor 10
Moves the optical head 6 in the positive direction of the y-axis (hereinafter, referred to as
This is called head move operation. ), An operation of preventing the optical system 7 from exceeding the movable range is performed.

In the case of FIG. 4, the spot S ₁ sequentially scans the adjacent track from the track T ₁ and reaches the track T ₅ ,
In the middle of the recording area a, the optical system 7 moves to the movement range Ymax. Therefore, before this, the optical head 6 is moved in the positive y-axis direction by the pulse motor 10.

[Problems to be solved by the invention]

However, the pulse motor 10 in order angular acceleration is large, y-axis direction of the acceleration of the optical head 6 is also increased, and the relative positional deviation of the light spot S ₁ and the track to some extent occurs during head move operation. At this time, if there is a large dust or scratch on the optical card 1 or if vibration is applied from the outside, the tracking is easily shifted.

In particular, in the conventional optical information recording / reproducing apparatus, since this head move is performed also in the recording area a, tracking deviation occurs during recording, and the light spot moves to another recorded track, and the pit is moved. There is a drawback that the information is overwritten and the recorded information is crushed.

Further, even if tracking deviation does not occur, there is a disadvantage that the relative position deviation between the light spot and the track occurs to some extent during the head move operation, so that the data error rate of recording / reproduction increases.

[Means for solving the problem]

The optical information recording / reproducing apparatus of the present invention performs optical information recording and / or reproducing information in a recording area on the recording medium by reciprocally scanning an optical spot along a track on the card-shaped recording medium. In a recording / reproducing apparatus, an optical system for forming the light spot on the recording medium, and the optical system within a predetermined movable range for holding the optical system and causing the light spot to follow the track. Optical system driving means for moving the optical system in the tracking direction, and an optical head moving means for moving the optical head holding the optical system driving means in the tracking direction so that the optical system does not exceed the movable range, When the light spot is in the recording area, the movement of the optical head is prohibited.

[Action]

According to the present invention, when the light spot is in the recording area of the optical information recording medium, the movement of the optical head is prohibited, and the movement of the optical head is performed in an area other than the recording area, so that the information can be recorded and reproduced during the recording. The relative displacement between the light spot and the track is reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic explanatory diagram for explaining the operation of the first embodiment of the optical information recording / reproducing apparatus of the present invention.

Since the basic operation is substantially the same as the operation already described with reference to FIG. 4, only the characteristic portions of the invention will be described in the following description for simplification.

As shown in the figure, each light spot S ₁ and S ₃ are disposed on the track T ₁ and T ₂ in the beginning, then starts to move in the positive direction of the X axis, records the pits in the range of the recording area a . Subsequently, when the light spot reaches the region b, and the positive direction of the Y axis performs track jump, respectively the light spot S ₁ and S ₃ moves to the track T ₂ and T _3. Thereafter, the head is moved by the distance Yt in the area b. The head move may be performed before the track jump.

Next, the light spot is moved in the negative direction of the X axis, and pits are recorded in the recording area a. When the spot reaches the region c, performs a track jump in a positive direction of the Y-axis, the spot S ₁ and S ₃ moves to the track T ₃ and T _4. Before or after this track jump, a head move is performed in the positive Y-axis direction by a distance Yt.

Thus, the track jump is performed, and the optical system 7 is moved.
If the head is moved only by Yt before or after the displacement of Yt by Yt, the maximum displacement of the optical system 7 is ΔY + Yt, which is usually smaller than the movable range Ymax of the optical system 7. However, tracking control cannot be disabled. Further, according to this method, it is not necessary to perform the head move in the recording area a.

(Second Embodiment) In the first embodiment, the case where the head move is performed when the light spot is moving in the X-axis direction in the region b or the region c has been described. It is not limited when moving in the direction. Japanese Patent Application No. 62-
In the optical information recording / reproducing method and the optical information recording / reproducing apparatus of 182316, it is disclosed that a track jump is performed when the movement in the X-axis direction is stopped. This can be done when the move is stopped in the X-axis direction.

Third Embodiment In the first embodiment and the second embodiment, a case has been described in which a jump is made to a track that is separated and approached by a track jump. However, the present invention is not limited to this. The track jump for n tracks is performed, or when the track jump is performed, the head move distance may be set to n × Yt. However, n at this time must satisfy Ymax> n × Yt + ΔY. This is because if n × Yt + ΔY exceeds Ymax, tracking control becomes impossible.

Fourth Embodiment In the first, second, and third embodiments, the head move is performed by a distance of n × Yt in correspondence with n track jumps. It will not be done. Changes in the optical system 7 when starting to move the head
Y _H may be determined so as to satisfy Y _H <Ymax−ΔY, and the head move may be performed in an area other than the recording area a.

FIG. 2 is a schematic explanatory diagram for explaining the operation of the fourth embodiment of the optical information recording / reproducing apparatus of the present invention.

Note that, similarly to the first embodiment, the basic operation is substantially the same as the operation already described with reference to FIG.
In the following description, only the features of the present invention will be described.

As shown in the figure, the spot S _1, S ₃ is when moved to the track T _5, T _6, the displacement in the Y direction of the optical system 7 is to become Y _H. If the head is moved in the Y direction before entering the area a, the displacement Y _G of the optical system when the spot moves to the area b becomes Y _G <Y _H + ΔT <Ymax, and tracking control becomes impossible. There is nothing.

Here, as a method of knowing the amount of displacement of the optical system 7 in the Y direction, a method of detecting a low-frequency component of a tracking error signal disclosed in Japanese Patent Application No. 61-153276 may be used.
Further, means for detecting the position of the optical system disclosed in Japanese Patent Application No. 62-190448 may be provided.

〔The invention's effect〕

As described above, according to the optical information recording / reproducing apparatus of the present invention, the displacement of the optical spot and the track during recording / reproduction can be reduced by prohibiting the movement of the optical head in the recording area. Therefore, the data error rate of recording and reproduction can be reduced, and a highly reliable device can be provided. Further, since the possibility of tracking deviation during recording can be reduced, the probability of crushing recorded information can be extremely reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram for explaining the operation of the first embodiment of the optical information recording / reproducing apparatus of the present invention. FIG. 2 is a schematic explanatory diagram for explaining the operation of the fourth embodiment of the optical information recording / reproducing apparatus of the present invention. FIG. 3 (A) is a schematic plan view of a drive section of an optical information recording / reproducing apparatus using an optical card, and FIG. 3 (B) is a front view thereof. FIG. 4 is a schematic diagram of the format of an optical card for explaining the operation of the conventional example. 1 ... optical card, 2 ... shuttle, 3 ... belt, 4a, 4
b: Pulley, 5: DC motor, 6: Optical head, 7
… Optical system, 8… light beam, 9… ball screw, 10…
... Pulse motor.

Claims (1)

(57) [Claims] An optical information recording / reproducing apparatus for recording and / or reproducing information in a recording area on a recording medium by reciprocally scanning an optical spot along a track on a card-shaped recording medium, An optical system for forming a light spot on the recording medium; and moving the optical system in a tracking direction within a predetermined movable range in order to hold the optical system and follow the track with the light spot. An optical system driving unit; and an optical head moving unit that moves an optical head holding the optical system driving unit in the tracking direction so that the optical system does not exceed the movable range. An optical information recording / reproducing apparatus for prohibiting movement of the optical head when it is in an area.