JPH0227575A - Optical disk filing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc file device, and particularly to a means for registering index data added to data registered in an optical disc file.

[Conventional technology]

For example, Obtronics Co., Ltd., December 1985 I
Published on the 0th, “Easy to Understand Optical Disc”, page 175~
As described on page 201, in recent years, image file systems and document file systems using optical disks have attracted attention as new document management means.

In this type of optical disk file system, along with image data or document data, index data necessary to search the data is added to the optical disk.For example, taking a document file system as an example, when an attempt is made to register Along with the document data, the document data's document name (1 category), author (1 publisher), publication date, etc.
Character data that can identify the document data is added as index data.

Conventionally, optical discs used in optical disc files have recording tracks formed in a spiral or concentric pattern, and one revolution of each recording track is divided into a plurality of sectors of equal recording capacity. Image data or document data and their index data are registered separately. Each sector is usually formed to have a recording capacity of about 1 to 2 kilobytes.

[Problem to be solved by the invention]

However, the amount of index data is usually about 200 bytes at most, and if one index data is recorded in a sector with a recording capacity of 1 to 2 kilobytes, the remaining space will be wasted. Recording density decreases. To explain this in more detail, on an optical disk, by specifying the address of a sector, data is written to the sector, and data written to the sector is read.

It is not possible to add data to the middle of a sector or to selectively read some data in a sector. Therefore, even if there is space for recording other data in the remaining portion where the index data has been written, it cannot be used effectively and becomes dead space.

Furthermore, the read speed of data from an optical disk is the product of the number of rotations of the optical disk and the length of one sector, that is, the number of sectors that the laser spot scans within a unit time. When recording, the time required to read the index data is wasted due to the dead space. Therefore, it takes a long time to read the index data and, furthermore, to search the image data or document data.

The present invention has been made in order to solve the problems of the prior art described above, and an object of the present invention is to provide an optical disc file device with a high data recording density and a quick search speed for index data. .

[Means to solve the problem]

In order to achieve the above object, the present invention divides a recording area of an optical disc provided in an optical disc file into a recording area for recording image data or document data and a recording area for recording index data, and The recording capacity of each sector in the recording area is made smaller than the recording capacity of each sector in the recording area for recording image data or document data.

[Effect]

As mentioned above, the amount of index data is 20
Since it is approximately 0 bytes, by optimizing the recording capacity of each sector in the recording area for index data recording, index data can be packed and recorded in one recording trunk. Therefore, the recording capacity of each sector is effectively utilized, dead space is reduced, and the recording capacity of the optical disc can be substantially increased.

Moreover, by doing so, the number of index data scanned by the laser spot within a unit time can be increased without changing the rotation speed of the optical disc. Therefore,
Index data can be read out quickly, and image data or document data can be searched quickly.

〔Example〕

First, the overall configuration of the optical disc file device according to the present invention will be explained based on FIG. 2.

As shown in this figure, the optical disk file device of the present invention includes a central processing unit 1 that controls the entire system, an optical disk file 2 that registers image data or document data, and index data, and a file that controls this optical disk file 2. It is comprised of a controller 3, a magnetic disk 4 for recording data read out when the system is started, various memories 5-8, and various terminal devices 9-13.

The various memories include a program memory 5 in which a control program for operating the central processing unit 1 is stored, a work memory 6 in which variables and tables used by the central processing unit t are stored, and image data or document data. a buffer memory 7 for temporarily storing image data 1, and image data 1 to be displayed on a display included in the various terminal devices.
A bitmap memory 8 corresponding to one pair is included.

The various terminal devices include a scanner 9 for writing data into the optical disc file 2, a scanner controller 10, a display 11 for displaying data read from the optical disc file 2, a display controller 12, and a command controller. A keyboard 13 for inputting character data, image indexes, etc. is provided.

The optical disc file 2 consists of an optical disc on which data is recorded and a disc drive device that writes/reads data to/from this optical disc.

FIG. 3 is a plan view showing an example of an optical disc provided in the optical disc file 2, in which a center hole 14 is opened in the center, and a recording area 15 is formed in a ring-shaped area concentric with the center hole 14. It is formed. This recording area 15 has spiral or concentric recording tracks 1.
6 a, 16 b.

16c...16x are formed at a constant pitch.

The inner circumferential portion 15a of the recording area 15 is an area for recording index data, and the outer circumferential portion 15b is an area for recording image data or document data. In the index data recording area 15a, the recording tracks 16a to 16m for each round are divided into a large number of sectors 17a, 17b, 1.
7c...The sector 18a is equally divided into 17x, and in the area 15b for recording image data or document data, there are fewer recording tracks 16n=16x for each round.

It is equally divided into 18b, 18c...18x.

Therefore, when observing this optical disc from a plane direction, as shown in FIG. 3, the angle formed by the partitions of each sector observed radially is narrow in the index data recording area 15a, and one image data or document data is stored. It is widely observed in the recording area 15b.

FIG. 1 is a diagram schematically showing the difference in recording capacity between an area 15a for recording index data and an area 15b for recording image data or document data. The sign is displayed. As shown in this figure, when the optical disc of FIG. 3 is rotated in a rotation mode with a constant angular velocity, the recording capacity of each sector in the index data recording area 15a is equal to one image data or each sector in the document data recording area 15b. It is smaller than the recording capacity of the sector. Specifically, the recording capacity of each sector in the area 15b for recording image data or document data is approximately 1 to 30 kilobytes, as in the past, and the recording capacity of each sector in the area 15a for recording index data is approximately 1 to 30 kilobytes. The capacity is 2
It is formed around 00 bytes 1, for example, 256 bytes. In this way, in the case of an optical disc having a recording capacity of 16 kilobytes per track, 64 pieces of index data can be recorded in the index data recording area 15a.

In addition, each sector 17a, t7b, 17c+"・17
The addresses x, 18a, 18b, 18c, . This can be specified by specifying the number of the sector relative to IEA-A. Therefore, by specifying this address, data can be written to a desired sector and data can be read from a desired sector.

Hereinafter, the data registration procedure in the device will be explained based on FIG. 4. Note that the following operations are performed by the central processing unit 1 according to the program stored in the program memory 5.
It will be held at

When the system is started and a document is read by the scanner 9, the image data or document data of the document is temporarily stored in the buffer memory 7. Next, the keyboard 13
When you input an index representing the classification name of this image data or document data by operating , and then perform a filing operation, the image data or document data is read out from the buffer memory 7 and is stored in the optical disk file 2 along with the index data. written.

At this time, the index data is written in the input order starting from the sector with the smallest sector number in the index data recording area 15a of the optical disc.

On the other hand, one image data or document data is written in the input order starting from the sector with the smallest sector number in the image data or document data recording area 15b of the optical disc. One index data is stored in one sector.
For image data or document data, a necessary number of sectors are used for one image data.

In FIG. 1, the index data of the m-th input image data or document data is recorded in the m-th sector 17m of the index data recording area 15a, and the image data or document data corresponding to the index data is recorded. , a state in which data is recorded from the n-th sector 18n to the (n+3)-th sector 18 (n+3) of the image data or document data recording area 15b is illustrated.

The index data written to the optical disc file 2 includes an image number (for example, 5 serial number), character data (so-called index) indicating the classification name of the image data or document data, and image data or document data. It includes the first sector address and data representing the size of this image data or document data. In the example in Figure 1, the sector address is 18n
The data representing the size of the image data or document data is the number of bytes in the shaded area displayed from sector 18n to sector 18(n+3).

Next, a search operation for image data or document data registered in an optical disc file will be explained.

First, the user inputs the index of the target image data using the keyboard 13 and commands a search.

This input index is the central processing unit i! It is stored in the work memory that stores variables and tables used by 1.

The central processing unit engineer sends a command to controller 3.

The index data stored in the index data recording area 15a is sequentially read from the optical disc file 2, and the indexes therein are compared with the input index stored in the work memory 6, and an index whose index matches the input index is found. Only data is stored in the work memory 6. Of course, index data read from the optical disk file 2 is immediately written to the work memory 6, but index data that does not match the input index is erased, and index data that matches the input index is stored as is.

In this way, all index data in optical disc file 2 is selected based on the input index,
Eventually, a table of index data whose index matches the input index is created in the work memory 6.

FIG. 4 shows a table of index data for the input index thus obtained in the work memory 6, and here it is assumed that there are two pieces of image data for this input index. Each index data 1 is.

Same index and starting address nl p n2
*・・・・・・nl and data representing the size of image data! 11. li2... SIL is in a row.

When this process is completed, images are sequentially generated from the image data or document data recording area 15b of the optical disk file 2 for each index data stored in the work memory 6 automatically or each time the keyboard 13 is operated. Data or document data is read.

That is, first, in the table of FIG.

The starting address n1 of the image number l and the size data Sl of this image data or document data are read from the work memory 6, and the controller 3 uses these to read out the starting address nl from the sector 15b for recording image data or document data. The image data having a number of bytes of 31 is read out and displayed on the display 11.

In the optical disc file device of the embodiment, the recording capacity of each sector included in the index data recording area 15a is adjusted to the minimum size necessary for recording index data, so that the index data can be recorded in one recording track. Data can be packed and recorded. Therefore,
The recording capacity of each sector is effectively used, dead space is reduced, and the recording capacity of the optical disc can be substantially increased.

Further, a large amount of index data can be read out within a unit time without increasing the rotational speed of the optical disc. Therefore, it is possible to speed up the search for 5 image data or document data.

〔Effect of the invention〕

As explained above, the optical disk file device of the present invention optimizes the recording capacity of the sector for recording index data, so it is possible to substantially increase the recording capacity of the optical disk. The search time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing the recording area of an optical disc;
FIG. 2 is a block diagram showing the overall configuration of the optical disk file device according to the present invention, FIG. 3 is a plan view showing an example of an optical disk provided in the optical disk file, and FIG. 4 is an index data table created in the work memory. It is an explanatory view showing an example. 1: Central processing unit, 2: Optical disk file, 4: Magnetic disk, 5 Niprogram memory, 6: Work memory,
7: Buffer memory, 8: Bitmap memory, 13:
Keyboard, 14: Center hole, 15: Recording area, 16a
"16x: Recording track, 17a to 17x: Sector, 1
5a: Recording area for index data; 15b: Recording area for image data or document data. Figure 1 Figure 2 Figure 4 → Cause 3 Figure 4

Claims (1)

[Claims] An optical disk is provided in which recording tracks are formed in a spiral or concentric shape, and one revolution of each recording track is divided into a plurality of sectors, and image data or document data and index data of each of these data are registered in separate sectors. In the optical disc file device, the recording area of the optical disc is divided into a recording area for recording image data or document data and a recording area for recording index data,
An optical disc file device characterized in that the recording capacity of each sector in the recording area for recording index data is smaller than the recording capacity of each sector in the recording area for recording image data or document data.