JPS6376167A - Optical memory device - Google Patents

Abstract

PURPOSE:To simplify and miniaturize a device and to shorten an access time by turning an endless tape-shaped optical recording medium with two rotary drums. CONSTITUTION:To the recording film of endless tape-shaped medium 15 to travel in the T direction of an arrow by two rotary drums 16 and 17, an optical head 18 is moved in the S direction of an arrow by a moving mechanism 19, a laser light is projected and the recording and reproducing are executed. When the optical head 18 and a moving mechanism 19 to drive the optical head 18 are arranged at an internal space surrounded by two rotary drums 16 and 17 and the medium 15, a volume ratio to obtain the same memory capacity comes to be smaller and an access time can be equally maintained. Thus, an optical memory device applicable to an on-line filing device is realized.

Description

Detailed Description of the Invention [Summary] In order to increase the capacity of an optical storage device, the present invention simplifies the device by rotating an endless tape-shaped optical recording medium with two rotating drums. This simultaneously achieves miniaturization, miniaturization, and shortening of access time.

[Industrial application field]

The present invention relates to an optical storage device, and particularly to its structure.

Currently, in large and small computer systems, the cost of external storage devices is said to reach 35-55% of the total system (hardware only), and the amount of data that needs to be stored is increasing at an annual rate of 20-30%. It continues to be . Therefore, there is a strong demand for the development of an external storage device that can store a large amount of data at low cost with a small footprint. More importantly, as computers become faster and more sophisticated, it is necessary to shorten data access time.

Optical storage systems can be cited as a way to realize these social demands. This is because the recording density is 10 to 20 times higher than that of magnetic recording because the laser beam is focused to the diffraction limit for recording.

However, the optical recording currently in practical use is in the form of a disk (disk), and its storage capacity is approximately 3 GB (B
(represents a byte, and the following 8 bits are expressed in Ibyte), and the access time is about several hundred. To build an ultra-large online file, a jukebox structure must be used, but in this case, the access time is about 10
~15 seconds, which is too long.

Therefore, in order to construct an online data file with extremely large capacity, small equipment area, and short access time, a structure with a different concept from the conventional disk-shaped storage device is required.

[Conventional technology]

FIG. 6 shows a conceptual diagram of a conventional single-disc type optical disc device.

In the figure, reference numeral 1 denotes an optical disk medium, which is rotated by a spindle shaft 2 in the direction of arrow F.

Reference numeral 3 denotes an optical head which is moved to a target track by a carriage 4 and performs recording and reproduction.

FIG. 7 shows a conceptual diagram of a conventional jukebox type optical disc device. In the figure, an optical disk medium 5 is selectively taken out from the self by an accessor 6, and then set on a deck 8, and is rotated to perform recording and reproduction using the same principle as in FIG. 6. When this is completed, the optical disk medium 5 5 is stored in the original cell position by the accessor 6.

FIG. 8 shows a conceptual diagram of a conventional optical tape device.

In the figure, reference numeral 9 denotes an optical tape, which is wound around a take-up reel 10 and a supply reel 11 in the same way as magnetic tape, and the optical tape 9 moves at a constant speed by rotation in the direction of arrow P.
The optical head 3 performs recording and reproduction.

FIG. 9 shows a conceptual diagram of a conventional optical drum device.

In the figure, reference numeral 12 denotes an optical drum having an optical recording member formed on its surface, which rotates about a shaft 13 in the direction of arrow Q. The optical head 3 records and reproduces data on the optical drum 12 using a laser beam emitted through an objective lens (not shown). 1
Reference numeral 4 denotes an access mechanism consisting of a belt, a boom, etc. for moving the optical head 3 in the direction of the axis 13 of the optical drum 12, and rotates in the direction of arrow R to move the optical head 3 onto a target track. Perform post-recording and playback.

[Problem that the invention seeks to solve]

Several tens of GB to 100 CAB as an online file device
It is impossible to achieve a storage capacity of 100 kHz using the conventional techniques shown in FIGS. 6 to 9 for the reasons described below.

In the system shown in Figure 6, the optical head 3 is thick (20X60
x 70 ml11), even if it is a pack-type device in which disks are stacked one by one, the device becomes large because it is necessary to keep a wide gap between each disk. Further, since the weight of the optical head is heavy at 50 to 100 g, there is a drawback that access time must be sacrificed in order to simultaneously operate a large number of optical heads arranged on each disk surface.

The method shown in FIG. 7 has the disadvantage that online access time is slow because optical disk media are taken out one by one from distant cells.

The method shown in FIG. 8 requires moving the optical tape until the desired data is found, and also has the drawback of slow online access time.

Although the access time of the method shown in FIG. 9 is as fast as that of a single optical disk, the storage capacity is not significantly increased.

The present invention was created in view of the above-mentioned conventional drawbacks, and aims to provide an optical storage device that has a large storage capacity per unit volume and can significantly shorten access time.

[Means for solving problems]

As shown in FIG. 1, the optical storage device of the present invention includes an optical recording medium 15 formed by forming a recording film on an endless tape on which information can be recorded by irradiation with a laser beam, and the optical recording medium 1.
Two rotating drums 16.17 that rotate 5 at a constant speed
, at least one optical head 18 for recording and reproducing that is movable in a direction perpendicular to the running direction of the optical recording medium 15 , and a moving mechanism 19 for the optical head 18 . Note that the optical head 18 and its moving mechanism 19 are preferably disposed in an internal space surrounded by the two rotating drums 16 and 17 and the optical recording medium 15.

[Effect]

The optical head 18 is moved in the direction of arrow S by a moving mechanism 19, and irradiates the recording film of the endless tape-shaped optical recording medium 15, which is moved in the direction of arrow T by two rotating drums 16 and 17, with laser light to record. Perform playback. This optical head 18 and the moving mechanism 1 that drives the optical head 18
9 is placed in an internal space surrounded by two rotating drums 16 and 17 and the optical recording medium 15, the volume ratio for obtaining the same recording capacity is 1.5 mm compared to the optical drum device shown in FIG. As shown in Fig. 4, the size is reduced and the access time can be maintained the same. This realizes an optical storage device that is compatible with an online file device.

〔Example〕

Hereinafter, embodiments of the present invention will be described using an optical drum (Japanese Patent Laid-Open No. 6O-6458), which is a promising online ultra-large file device.
This will be explained in detail with reference to the drawings while comparing with 4).

FIG. 2 is a shape comparison diagram of the optical drum and the present invention, (a)
is an optical drum device, (bl is a symbol indicating the external dimensions of the optical recording medium of the present invention.

Figure 2 (in al, the diameter of the drum is 2 kr (k is the second
If the ratio of the diameter to the diameter 2r of the rotating drum 16 and 17 shown in Figure (b) is the width of the drum, T is the number of tracks per unit length, and b is the number of bits per unit length, then
The storage capacity ffl s + and the volume V realized by the optical drum are S, = (2 kr) ・rc-L, -T-b ---
1■V, = (k r)”・π・L −−−−−−−−
-■ In Fig. 2 (bl), the diameter of each rotating drum 16.17 is 2r, the width of each rotating drum is the same as the width of the optical drum, and the distance between the axes of each rotating drum is D. The storage capacity S2 and volume v2 realized by the optical recording medium are S, = (2ryc+2D) ・L, -T-b --
1■V2= (πr”+2 rD) ・L −−−−
−−−■Here, the condition for 32≧SI is D≧π (k−1) ・r −−−−−−−−−0 from formula 0 and formula 0.
From formula 0, (D/2r)≧rc (k-1) /2---■
The relationship of this equation 0 is shown in FIG.

FIG. 3 shows a comparison diagram of the storage capacity of an optical drum and an optical recording medium of the present invention. That is, take the ratio of D/2r on the vertical axis,
When the diameter ratio k is plotted on the horizontal axis, the area above the diagonal line in the figure indicates that the recording capacity of the optical recording medium of the present invention is larger than that of the optical drum (S
A region where Z≧S+) is shown.

Next, calculate the volume ratio Vz/V+ when the storage capacity is the same.

When calculated from the formulas ■ and ■, VZ/Vl= (2k-i) /k”−−−−−−・−
@The relationship of this equation 0 is shown in Figure 4.

FIG. 4 shows a volume comparison diagram of an optical drum and an optical recording medium of the present invention. In the figure, from the curve where the vertical axis is the volume ratio Vz/V+ per recording capacity i and the horizontal axis is the diameter ratio k,
Even if the storage capacity is the same, the volume can be reduced in the case of the present invention. For example, it can be seen that when the diameter ratio is 3.5, the storage capacity remains the same even if the volume is halved.

Further, as described in FIG. 1, if the optical head 18 and moving mechanism 19 of the present invention are placed in the internal space surrounded by the optical recording medium 15 of the present invention and each rotating drum 16, 17, the effective volume becomes even smaller.

Now, the diameter 2r of the rotating drums 16 and 17 in the present invention is 100 mm, and the distance between the axes of the rotating drums is 300 mm.
.

If the width of the rotating drum is set to a realistic value of 100 mm, and the diameter of the track pitch of 1.6-11 bits is IJM, then the storage capacity of the device of the present invention is calculated from the above formula 0, as follows: Sz = ( 100π+2 X300) X 100÷
(1,6×10-'
It becomes possible to store an extremely large amount of data of 10 GB in a narrow space of 0.00 mm. To realize this device, a drum rotation system, a head drive system, a circuit system, etc. are added. When added to, the vertical, horizontal,
The height is approximately 250 x 450 x 150mm.
It can be stored in the bag.

FIG. 5 shows a detailed illustration of the invention. In the figure, reference numeral 20 denotes an additional device that accommodates the drum rotation system, head drive system, circuit system, etc. Vertically, in order to accumulate 10 units of this device,
Approximately the volume occupied by the width and height is 250x (450
x2) x (150x5) = 250x 900x
100 GB of data can be stored in a narrow space of 750 mm, and it can be searched with high-speed access comparable to that of magnetic disks.

Note that the optical head can also be placed outside the optical recording medium of the present invention.

〔Effect of the invention〕

As explained in detail above, according to the optical storage device of the present invention, a compact, large-capacity optical storage device can be realized, and the maximum linear recording density determined by the recording material and optical head can be used, resulting in good recording efficiency. Since the recording medium is not disk-shaped, the amount of laser power is always constant, and the drive circuit for the optical head can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the principle of the present invention. FIG. 2 is a shape comparison diagram of an optical drum and an optical recording medium of the present invention. FIG. 3 is a comparison diagram of recording capacity of an optical drum and an optical recording medium of the present invention. Fig. 4 is a volume comparison diagram of an optical drum and an optical recording medium of the present invention, Fig. 5 is a detailed explanatory diagram of the present invention, Fig. 6 is a conceptual diagram of a conventional single-plate optical disk device, and Fig. 7 is a conventional one. FIG. 8 is a conceptual diagram of a conventional optical tape device, and FIG. 9 is a conceptual diagram of a conventional optical drum device. In FIG. 1, 15 is an endless tape-shaped optical recording medium, 16 and 17 are rotating drums, 18 is an optical head, and 19 is a rotary drum.
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Claims (2)

[Claims] (1) Optical recording medium (15
), two rotating drums (16, 17) that rotate the optical recording medium (15) at a constant speed, and two rotary drums (16, 17) that are movable in a direction perpendicular to the running direction of the optical recording medium (15) and that have a recording film coated with a laser beam. at least one recording/reproducing optical head (18) that irradiates light, and the optical head (18);
18) A moving mechanism (19) for moving the optical storage device. (2) The optical head (18) and its moving mechanism (19)
) are arranged in an internal space surrounded by the two rotating drums (16, 17) and the optical recording medium (15).