JPS61261835A - Optical information storage medium - Google Patents

Abstract

PURPOSE:To obtain an optical recording medium having high economy by forming the medium in such a manner that a pair of spiral recording tracks formed respectively to information forming layers facing each other intersect with each other when viewed through from above. CONSTITUTION:The recording tracks 5b are formed spirally on the information forming layers 5c formed to face each other on an optical disk 5. The tracks 5h are so formed as to bulge outward in the radial direction according to the extension along the clockwise direction when viewed from the lower surface on the upper information forming layer 5c. On the other hand, the recording tracks 5e are so formed as to bulge outward in the diametral direction according to the extension along the clockwise direction when viewed from above on the lower layer 5c as well. More specifically, the recording tracks 5e formed on the upper and lower layers 5c appear eventually to swirl in the directions opposite from each other when the disk 5 is viewed through from above. The upper and lower track layers 5h are thus formed by the same stamper and the improvement of economy is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in optical information storage media such as optical disks used in image information processing devices.

[Technical background of the invention and its problems]

Recently, image information processing devices that use optical disks as storage media can greatly increase the amount of information that can be stored compared to magnetic image information processing devices that have been widely used in the past. In addition to providing a stable playback state, the storage state is extremely stable as it is difficult to be affected by external influences, and information processing can be performed in a non-contact state, so there are no negative effects such as damage to the storage medium or information processing head. It is becoming more and more widely used due to its characteristics such as:

Furthermore, recently, in order to cope with the increase in the amount of information processing, development of image information processing apparatuses that can handle a plurality of optical disks has been progressing.

Under these circumstances, optical discs have been developed in which information forming layers are provided on both the front and back sides. However, such optical discs cannot be used in a single image information processing device.
Since a large number of discs are used, cost reduction is a serious issue for users, and there is a strong desire for economical optical discs.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and an object of the invention is to provide an economical optical information storage medium.

[Summary of the invention]

In order to achieve the above object, the optical information storage medium of the present invention is an optical information storage medium provided with a pair of annular information forming layers, which are provided opposite to each other and are made of a recording layer or a light reflecting layer. One of the information forming layers is formed with one spiral recording track that swells outward in the radial direction as it is wound in one direction, and the other information forming layer is formed with a recording track that expands outward in the radial direction as it is wound in one direction. , the other spiral recording track bulges outward in the radial direction, and when both recording tracks are seen through from one side, both recording tracks are configured to intersect with each other.

[Embodiment of the Invention] Hereinafter, a case where an embodiment of the optical disc according to the present invention is applied to an image information processing device will be described with reference to the drawings.

FIG. 1 shows the external appearance of the image information processing device X, and reference numeral 1 in the figure indicates the main body of the device having a cover 2 on the top.

The apparatus main body 1 houses an optical disk handling mechanism section 3 and a control section X1 (described later).

As shown in FIG.
A storage medium unit 6 is provided.

While rotating this storage medium unit 6, a predetermined optical disc 5 is selected and information processing is performed.

In the storage medium unit 6, after the timing disk 7 is fitted onto the drive shaft 4, a plurality of (five in this embodiment) collars 8 and optical disks 5 are fitted alternately, and then, After the upper collar 9 is fitted onto the outside, a nut 11 integrally provided with a handle 10 is screwed to form a connit structure.

Further, the drive shaft 4 of the storage medium unit 6 extends in the vertical direction, and both ends 4a and 4b thereof are tapered, and one end (lower end) 4a is fitted into the tapered hole 12a of the drive member 12. By fitting the other end (upper end) 4b into the tapered hole 13a of the holding member 13, the drive shaft 4 is held vertically and rotatably.

The holding member 13 that holds the upper end of the drive shaft 4 has its support shaft 13b rotatably held by a bearing 15 provided at the tip of the arm 14.

The arm 14 is attached such that its base end is rotatable via a support shaft 16 and is always biased in a predetermined direction (in the direction of the arrow in FIG. 2) by a torsion spring 17 as a biasing body. ing. In this way, the drive shaft 4 is pressed with a constant force, and the rotation of the information storage medium unit 6 is maintained stably.

Further, the arm 14 is rotatable in the direction opposite to the arrow direction against the biasing force of the torsion spring 17, so that the holding member 13 can be removed from the upper end of the drive shaft 4 if necessary. It has become. In this state, by holding the handle 10 and lifting it upward, the information storage medium unit 6 can be handled out of the apparatus main body 1 from the opening 19 formed in the upper frame 18 along the vertical direction. It becomes.

On the other hand, the drive member 12 that holds the lower end of the drive shaft 4 has its support shaft part 12b rotatably held by a bearing part 21 mounted on the lower frame 20, and also has a gear 25 and a gear. It is configured to be interlocked with a drive shaft 28a of a motor 28 for driving the storage medium unit via a power transmission system consisting of a belt 26, gears 27, and the like.

In addition, as shown in FIG. 3, there is a structure near the information storage medium unit 6 which is rotationally driven while the drive shaft 4 is held in the vertical direction. A pair of reading units 30, 30 as information processing units are arranged at symmetrical positions.

These reading units 30, 30 are attached to a movable member 36 made of an internally threaded member screwed onto a screw shaft 33 rotatably supported by bearings 34.35 provided on both the upper and lower frames 18.20, respectively. It is configured to move up and down in conjunction with the rotation of the screw shaft 33.

These reading units 30, 30 each include a head arm assembly 31 and a head arm assembly swinging mechanism 32 for swinging the head arm assembly 31 by a required amount. Further, the head arm assembly swinging mechanism section 32 is provided with a pair of guide rollers 37, 37, which are in rolling contact with a guide shaft 38 provided parallel to the screw shaft 33 sandwiched therebetween from both sides. , the head arm assembly swing mechanism section 32 itself is prevented from rotating about the screw shaft 33. On the other hand, the head arm assembly 31 is rotatably attached to the movable member 36 via a bearing 39, and the head arm assembly 31 is rotated by the action of the head arm assembly swinging mechanism 32. It is configured to swing along a horizontal direction perpendicular to the radial direction of the optical disk (direction of arrow B in FIG. 3), that is, the direction in which the drive shaft 4 extends.

Further, the head arm assembly 31 has a configuration as shown in FIG. That is, the reference numeral 45 in the figure indicates a head arm having a head 48 having a built-in objective lens 46 and a prism 47 that are movable by a lens actuator (not shown) at its tip. This head arm 45
is held by a main member 49 attached to the movable member 36 via a bearing 39. The base end of the head arm 45 is rotatably held via a bearing 50 provided on the main member 49, and a helad arm rotation motor 51 is provided in the middle of the base end.
A driven gear 54 is attached which interlocks with a drive gear 52 attached to the drive shaft of the drive shaft via an intermediate gear 53. The head 48 is configured to be able to rotate 180 degrees in forward and reverse directions by driving the motor 51 so as to be able to face both sides of the optical disk 5. At this time, the center of rotation of the head arm 45 equipped with the head 48 is aligned with the center of the optical axis of the laser beam a, so that the reading operation is not adversely affected.

The main member 49 has a λ/4 state that corresponds to the extension line of the optical axis of the laser beam a of the herad arm 45.
A plate 55, a polarizing beam splitter 56, a collimator lens 57, and a laser generator 58 are arranged, and the laser beam a is guided to the optical disk 5, and the reflected light is split at 90 degrees by the polarizing beam splitter 56. It is designed to be deflected. A half prism 6o, a light projecting lens 61, and a photodetector 62 are arranged in the direction of polarization of the reflected light by the polarizing beam splitter 56 to read information and detect track deviation. Further, a light projecting lens 63 and a photodetector 64 are arranged in the direction of reflection of the light reflected by the half prism 60 to detect focus blur.

On the other hand, the helad arm assembly swinging mechanism 32 has a configuration as shown in FIG. 5. That is, the head arm assembly swing mechanism 32 includes the holder 70 and the holder 7.
0 and a near motor mechanism 71.

As described above, the holder 70 is attached to the movable member 36 in a state where it is prevented from rotating by rolling the pair of idle rollers 37 and 37 onto the guide shaft 38, and the linear motor mechanism 71 is rotated in a predetermined manner. yokes 72a, 72b, 72c arranged at intervals of 74 and a coil 75 wound around the bobbin 74. (See FIGS. 2 and 5) The coil 75 wound around the bobbin 74 is attached to the helad arm assembly 31 side,
The head arm assembly is configured to be rotated by a predetermined angle by applying a drive signal voltage to the coil.

Further, the light emitting element 77 and the light receiving element 78 are arranged in such a state that the optical axis intersects with the movement locus of the head arm assembly 31 which is rotated by a predetermined angle by the head arm swinging mechanism 32. , optical detection means 79 for detecting whether or not the head arm 48 has come out of the optical disc 5.
has been configured. (See FIGS. 2 and 3) The head arm 48 is configured to prevent the reading unit 30 from moving up and down while facing the optical disc 5, and to reliably prevent collisions between the two.

Further, a drive system for driving the screw shafts 33, 33 for vertically moving the reading units 30, 30 has the following configuration. That is, as shown in FIG. 2, at the lower end of the screw shirts 1 to 33, there is a drive gear 81 attached to a drive shaft 80a of a motor 80 for moving the reading unit, and a driven gear interlocked via a toothed belt 82. 83 is installed. Then, the motor 80 rotates in the forward or reverse direction in response to a movement signal sent from the control section x1, thereby causing the screw shaft 33 to rotate in a predetermined direction, and the reading unit 30 to move either up or down (in the direction of arrow C). ) is configured to move by a predetermined amount.

Further, the amount of rotation of the screw shaft 33 is detected by a timing desk 85 attached to the screw shaft 33 and a detector 86 attached to the lower frame 20, so that the reading unit 30 can be moved to a predetermined position. At the same time, the brake device 87 prevents inertial rotation of the screw shirts 1 to 33 to improve stopping accuracy.

The rotation angle of the storage medium unit 6 is detected by a timing disk 7 attached to the drive shaft 4 and a detector 89 attached to the lower frame 20 via a holder 88. There is. (See FIG. 2) Further, 90 shown in FIG. 1 is an operating section provided at the front end edge of the cover 2 for opening and closing the upper part of the device main body 1.
91 shown in FIG. 2 are guide bodies that guide the insertion and removal of the storage medium unit 6, and these guide bodies 91...
* is placed in a position that does not interfere with the movement of the head arm 45.45.

Next, with reference to FIG. 6, the structure of the optical disc 5 used in one embodiment, which is a feature of the present invention, will be described. The optical disc 5 includes a pair of disk-shaped substrates 5a made of, for example, transparent plastic plates. A rotation center hole 5b into which the drive shaft 5 of the image information processing device is inserted is formed at the rotation center of each of these substrates 5a.

Further, on one side of each of these substrates 5a, an information forming layer 5C consisting of a recording layer or a light reflecting layer is arranged in an annular shape.
It is formed with an intermediate protective layer 5d interposed therebetween.

An outer spacer 5E and an inner spacer 5f, which are arranged concentrically with each other, are interposed between the substrates 5a so that the image information forming layers 5C face each other, and a hollow space is formed between the mutually opposing surfaces of the image information forming layers 5G. They are pasted together to form a portion 5Q. The optical disc 5 is constructed in this manner.

Here, the thickness of the substrate 5a is required to be 0.3 mm or more so that even if minute dust adheres to the surface of the optical disk 5, information processing such as writing and reading will not be hindered. In order to converge the laser beam with the aperture lens, it is desirable that the diameter is 5 mm or less. A transparent acrylic plate with a thickness of 1.0 to 1.5 mm is suitable in consideration of strength, lightness, etc.

A recording track 5h is formed in a spiral shape on the information forming layer 5C of the optical disc 5 configured as described above. In the upper information forming layer 5C, the recording track 5h is formed so as to swell outward in the radial direction as it extends clockwise, as shown in the bottom view in FIG. 7A. On the other hand, also in the lower information recording layer 5C, as shown in the top view in FIG. 7B, the recording tracks 5h are formed so as to expand radially outward as they extend clockwise.

That is, when this optical disc 5 is seen through from above,
The recording tracks 5h formed on the upper information forming layer 5C and the distribution tracks 5h formed on the lower information recording layer 5C appear to spiral in opposite directions.

In this way, since two recording tracks 5h are formed on one optical disc 5, one recording track 5h is numbered from the inside to the outside, while the other recording track 5h is numbered from the inside to the outside. In 5h, track numbers are assigned from the outside to the inside. Here, the stamper for manufacturing the recording track 5h formed on the upper information formation layer 5C and the stamper for manufacturing the recording track 5h formed on the lower information formation layer 5G are configured to be the same. This makes it possible to reduce the manufacturing cost of the optical disc 5.

On the other hand, as shown in FIG. 8, a plurality of the image information processing apparatuses X described above are installed, and each image information processing apparatus X is provided with one control section for driving and controlling the drive mechanism. . Further, the number of processing circuits Y is smaller than the number of heads 48, for example, two in this embodiment. Furthermore, a plurality of host computers Z are provided to control all the image information processing devices X and processing circuits Y.

These image information processing device 11X1 processing circuit Y and host computer Z constitute an image information processing system. Here, each head 48 is selected and managed by one of the processing circuits Y, as will be described later.

Further, a position detection mechanism 100 for accurately detecting the axial position of the reading unit 30, in other words, for accurately maintaining the distance between the head 48 and the optical disk 5 at a predetermined value, will be described.

This position detection mechanism 100 includes a first detection mechanism 101 that roughly detects the axial position of the reading unit 30, and a head 4.
8 and the optical disc 5.

As shown in FIG. 2, the first detection II structure 101 is composed of the timing disk 85 and the detector 86 described above. As shown in FIG. 9, slits 85a are formed at equal intervals on the outer peripheral edge of the timing disk 85. As shown in FIG. The detector 86 includes a light emitting element 86a and a light receiving element 86B that detects the light reflected by the timing disk 85 out of the light emitted from the light emitting element 86a. The detection level of the light receiving element 86b as the timing disk 85 rotates is as shown in FIG. Here, the control section x1 digitally detects the amount of rotation of the timing disk 85, that is, the axial position of the reading unit 30, very roughly by counting the peaks. In addition, the controller x 1 assumes that the change in the detected amount from one peak to the next is approximately linear, and controls the amount of rotation of the timing disk 85, that is, the axial position of the reading unit 30, in an analog manner. Detection is somewhat rough. In this way, the axial position of the reading unit l-30 is roughly detected by the first detection mechanism 101.

On the other hand, a so-called focus detection mechanism for the distance between the head 48 and the optical disk 5 is used. The output waveform of the detection signal from the photodetector 64 comes to exhibit a constant pattern as the optical disc 5 rotates, with rough position control completed by the first detector 4M102. That is, a first region where focus control is not possible at all, a third region where focus control is possible, and a region located between the first region and the third region where focus control is not possible but close. This indicates that a second area exists, and as the optical disc 5 rotates, the area changes to 1-2-3-2-1-2-3-2-1...
It will change sequentially.

Here, the control unit x1 checks the output waveform from the photodetector 64 and determines the current relationship between the optical disc 5 and the head 48 based on the relative relationship between the pattern that appears and the distance between the optical disc and the head 48. Recognize how far apart you are. In this way, the second detection mechanism 102 determines the optimal position of the head 48. In this way, the position of the head 48 is accurately detected by the position detection mechanism 100, and the position of the head 48 is accurately detected by the position detection mechanism 100.
is accurately positioned at a predetermined distance from the optical disc 5 by the control unit x1.

In addition, in order to detect which disk the reading unit h 30 is located between, the end face of the head 48 is removed from the storage medium unit 6 and moved in the axial direction. A detector 104 is provided at a portion facing the end surface of the optical disc 5 when the optical disc 5 is detected. This detector 104 includes a light emitting element 104a and a light emitting element 1
The light receiving element 104b receives the light reflected from the end surface of the optical disc 5 out of the light emitted from the optical disc 04a. Based on the detection result from the light receiving element 104b, the controller x 1 detects the number of times the reflected light is incident, and now the reading unit 3
0 is located between which optical disks 5.

Next, the operation of the image information processing device @X having the above configuration will be explained.

First, by operating the operation section 90, the optical disk handling mechanism section 3 becomes operational, and, for example, the host computer Z1 processing circuit Y1 display device,
It will be in a state where it is connected to a printer device, etc.

Then, the storage medium unit 6 including the plurality of optical disks 5 starts rotating at a predetermined speed.

On the other hand, an information retrieval signal from one control section causes one of the reading units 30 to move upward or downward (arrow C in FIG.
direction) and stops at a predetermined position, the head arm assembly 31 of this reading unit 30 moves toward the optical disc 5.
The distal end head 48 of the head arm 45 is moved in the radial direction (direction of arrow B in FIG. 3) to face the predetermined search information,
A read operation will begin.

At this time, another reading unit 30 is in a standby state in advance to read the information of the next selected optical disc 5. As soon as the reading operation of the predetermined information forming layer 5C is completed, the next reading operation is started.

Further, when the information formation layer 5C of the optical disc 5 being read and the information formation layer 5C of the optical disc 5 to be read next are in a state adjacent to each other, for example, the lower part of the optical disc 5 second from the top in FIG. Read the information formation layer 5G, and then read the information formation layer 5C above the third optical disc 5 from the top.
When reading the information of the same reading unit 30
Use it as is, and replace the Herad arm 45 currently in use with 1
It will be read by rotating it 80 degrees. Here, as is clear from FIG. 2, an objective lens 46 and a prism 47 are disposed within the head 48. In this way, the height of the head 48 is greater than half the distance between two adjacent optical disks 5. Therefore, it is impossible to simply rotate the head arm 45 by 180 degrees at this reading position. Therefore, the control section x1 causes the head arm assembly swinging mechanism section 32 to drive the head arm 45 in order to remove the helad arm 45 from the -H storage medium unit 6. In this way, the head arm 45 is rotated 180 degrees in the state of being taken out from the optical disc 5, and is driven to be positioned between the optical discs 5 again.

In addition, when replacing the information storage medium unit 6 for some reason, after opening the cover 2, move the arm 14 in the direction opposite to the arrow in FIG. 2 against the biasing force of the biasing body 17. By rotating, the holding member 13 is removed from the upper end of the drive shaft 4. Next, hold the handle 10 attached to the upper end of the information storage medium unit 6 and pull it upward.

It goes without saying that at this time, the head arms 45, 45 of both reading units 30, 30 are automatically retracted in advance to a position where they will not collide with the optical disk 5.

Here, with reference to FIG. 8, a plurality of image information processing devices
The operation of the image information processing system equipped with the following will be explained.

The two processing circuits Y mentioned above each perform all the reading processing.

In this state, the system sequentially connects a plurality of host combination coaters Z and two processing circuits Y to each other in a time-sharing manner. Here, in the first host computer Z, track number 1000. Sector number 6
Suppose you are instructed to read information about . Therefore, when the first host computer Z is connected to the first processing circuit Y, it determines whether the first processing circuit Y is vacant.

If the first processing circuit Y is vacant, then the connection state between the first processing circuit Y and one of the reading units 30 of the first image information processing device X is confirmed. If one reading unit 30 is already not occupied by the second processing circuit Y and is free, the host computer Z checks the free status of the other reading unit 30, and if the other reading unit 30 is also free. If it is vacant, the host computer Z determines which reading unit 30 is closer to the fifth optical disk 5, and selects the reading unit 3 that is closer to the fifth optical disk 5.
0 to access the fifth optical disk 5. Here, if the other reading unit 30 is not available, one reading unit 30 is made to access the fifth optical disc 5.

Further, if one reading unit 30 is already occupied by the second processing circuit Y, it is determined whether the other reading unit 30 is vacant, and if it is vacant, the second reading unit 30 is transferred to the fifth processing circuit Y. The optical disc 5 is accessed. Further, if the second reading unit 30 is also not available, it will be in a standby state until one of the reading units 30 becomes available.

On the other hand, assuming that the first processing circuit Y is already occupied, the host computer Z determines whether the second processing circuit Y is free, and if it is free, the following processing is performed in the same way as in the case of the first processing circuit Y. The host computer Z operates. However, if the second processing circuit Y is also not available, the process will be in a standby state until one of the processing circuits Y becomes available. In this way, no matter how many image information processing apparatuses X there are, they can all be managed by two processing circuits Y.

Further, both ends 4a, 4 of the drive shaft 4 of the storage medium unit 6
b has a tapered shape, and these both ends 4a, 4b
The tapered hole 12a of the driving member 12 and the holding member 13,
Since the storage medium unit 6 is held rotatably by being fitted and connected to each of the storage medium units 13a, it is extremely easy to install and remove the storage medium unit 6, and alignment can be performed automatically.

Here, it has been explained that five optical discs 5 are loaded in the storage medium unit 6 mentioned above.

However, in this embodiment, any number of optical discs 5 can be loaded. A case where two optical disks 5 are loaded into the storage medium unit 6 will be described with reference to FIG. 11.

As shown in the figure, a first optical disc 5 is placed on the lowermost collar 8, and this first optical disc 5
A second collar 8 is placed on top, and a second optical disc 5 is placed on top of this second collar 8. Three sets of auxiliary collars 88 having the same thickness as the collar 8 and the optical disc 5 are placed on the second optical disc 5. In this way, even if the storage medium unit 6 is equipped with only two optical discs 5, it will be attached to the optical disc handling mechanism section 3 in exactly the same way as when there are five optical discs 5.

In this embodiment, one image information processing device @
For X, using a plurality of heads 48, for example, two heads 48,
A plurality of optical discs 5, for example, five discs, are processed. Here, it becomes possible to preformat two optical discs 5 using two heads 48 at the same time. In this way, the time required for preformatting is cut in half, improving operability.

〔Effect of the invention〕

As described above in detail, the optical information storage medium according to the present invention is an optical information storage medium that is provided with a pair of annular information forming layers that are provided opposite to each other and that are made of a recording layer or a light reflective layer. One of the information forming layers is formed with one spiral recording track that expands radially outward as it is wound along one direction, and the other information forming layer is formed with a spiral recording track that expands outward in the radial direction as it is wound along one direction. Accordingly, the other spiral recording track is formed that expands outward in the radial direction, and when both recording tracks are seen through from one side, both recording tracks are characterized in that they are configured to intersect with each other. Therefore, according to the present invention, an economical optical information storage medium is provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing the external appearance of an image information processing device, FIG. 2 is a side view schematically showing the configuration of a disk handling mechanism, and FIG. 4 is a partially cutaway plan view showing the head arm assembly of the reading unit. FIG. 5 is a plan view showing the head arm assembly of the reading unit. FIG. 6 is a sectional view showing the optical disk; FIG. 7A is a bottom view showing the information forming layer on the upper side of the optical disk; FIG. 7B is a plan view showing the lower side of the optical disk. FIG. 8 is a top view showing the information forming layer; FIG. 8 is a configuration diagram showing the image information processing system; FIG. 9 is a top view showing the timing disk; FIG. 10 is the amount detected by the light receiving element as the timing disk rotates. FIG. 11 is a side view showing an image information processing apparatus in which only two optical disks are provided. 5... Optical disc (optical information storage medium), 5a.
... Substrate, 5C... Information formation layer, 5h... Recording track.

Claims (1)

[Scope of Claims] An optical information storage medium comprising a pair of annular information forming layers formed of a recording layer or a light reflecting layer, which are provided opposite to each other, and one of the information forming layers has an information forming layer along one direction. One spiral recording track is formed that expands radially outward as it is wound along the one direction, and the other information forming layer has a spiral recording track that expands radially outward as it is wound along the one direction. An optical information storage medium characterized in that the other spiral recording track is formed so that when both recording tracks are viewed from one side, the two recording tracks intersect with each other.