JPS6350918A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform the write of data without losing a content written on a sector desired to be written, by providing two optical sensitive recording layers which react only to respective different light having specific wavelength, and transmit the light other than the above light. CONSTITUTION:When a read command, an object sector address, and a recording layer selection signal are supplied to a recording control part 1, an address reading part 2 drives a laser drive 5, and reads out a bit of address information from a sector identifier part 13a, and sends it to an address comparison part 1a. The address comparison part 1a compares a sent address with an object address, and when coincidence between a compared result being obtained, the control part 1 issues an instruction to read the data to a first recording layer recording and reproducing part 3, or a second recording layer recording and reproducing part 4, corresponding to a first recording layer, or a second recording layer indicate by the recording layer selection signal. The reproducing part 3 or 4 drives the laser drive 5, and the data in the data area 13b or 11b of an optical disk 7 is read out from a semiconductor laser 6 by a laser beam having a wavelength of lambda1 or lambda2. In this case, the area 13b or 11b reacts only to light having the wavelength of lambda1 or lambda2, and transmits light having other wavelength.

Description

Detailed Description of the Invention: Industrial Field of Application Page 2 The present invention relates to an information recording/reproducing device for recording/reproducing data on an optical disc, and particularly for recording/reproducing data on an optical disc having two recording layers. The present invention relates to an information recording/reproducing device that makes it possible.

Conventional technology Conventional information recording and reproducing devices include a read-only type information recording and reproducing device that reproduces information on a read-only recording medium and a recording and reproducing type information recording and reproducing device that records and reproduces information on a recordable and reproducible recording medium. exist.

In the former conventional example of a read-only information recording/playback device, a read-only optical disk (hereinafter referred to as an R10 disk), in which data is recorded in the form of uneven focus on a disk-shaped plastic base material, is irradiated with a laser beam to record the data. Play. This apparatus does not include a recording means, but plays back an R10 disc that has been previously recorded using another means. Because of its large capacity, random access properties, ease of mass duplication, and low cost, R/○ disks are widely used as disks for recording dictionaries and font patterns for word processors, or for storing font patterns.
It has been devised to be used as a diary page for storing programs and manuals.

On the other hand, in the latter conventional example of a recording/reproducing type information recording/reproducing device,
Recordable optical disc (hereinafter referred to as W-enabled disc)
The device is capable of recording and reproducing data by irradiating laser light, and is equipped with a recording means and a reproducing means. Similar to R10 disks, W-enabled disks have large capacity and random access properties, and can record data that is not possible on R10 disks, so they can be used as auxiliary storage for computers just like hard disks and floppy disks. is being considered for use.

FIG. 4 is a block diagram showing the configuration of one embodiment of this conventional information recording/reproducing apparatus. In FIG. 4, 19 is a semiconductor laser that irradiates the recording surface with laser light, 18 is a laser drive that drives the semiconductor laser 19, and 16 is a laser drive.
An address reading section which drives the drive 18 and reads sector address information from a sector identifier section to be described later; 17 is a laser beam;
A recording and reproducing section drives the drive 18 to record/reproduce data in a data area to be described later; 16 is a recording and reproducing control section that drives the recording and reproducing section 17; This is an address comparison unit that compares reading results.

FIG. 6 shows an optical disc applied in a conventional embodiment,
FIG. 6d is a plan view of the optical disc when viewed from the front side, and FIG. 6 is a sectional view taken along line AA' in FIG. 6d. In FIG. 5, 20 is an optical disc, 21 is a center hole for mounting the optical disc on the disc motor, 22 is a recording surface, 23 is a disc base material such as polycarbonate resin, and 24 is a groove formed in the disc base material 23. truck,
26 is a photosensitive recording member, 26 is a photosensitive recording member 25
It is a protective layer that protects the skin. 81, 32, 83°・
..., Sn is the sector, 24a is the sector 81. S2
゜S3. . . . The sector identifier section 24b in which address information of Sn is recorded is a data area in which data can be recorded. G1. G2 is a gap where no data is recorded to absorb rotational fluctuations of the optical disc.

The operation of the conventional information recording/reproducing device will be explained in 5 pages below. When a read command is given to the recording/reproduction control section 15, when the address comparison section 15a detects a target sector, the recording/reproduction control section 16 issues a read instruction to the recording/reproduction section 17. The recording/reproducing unit 17 receives the read instruction and drives the laser drive 18 to read the data area 24.
Read data from b.

When a write command is given to the recording/reproduction control section 16, when the address comparison section 15a detects a target sector, the recording/reproduction control section 16 issues a write instruction to the recording/reproduction section 17. The recording/reproducing unit 17 receives the write instruction and drives the laser drive 18 to write data in the data area 24b.

FIG. 6 is an explanatory diagram of a case where font patterns are stored on an optical disc used in a conventional information recording/reproducing apparatus.

The operation when adding or modifying a new font pattern to this optical disc will be described below with reference to FIG.

“Light” is newly added to the font pattern area shown in Figure 6a.
When writing a Gothic font pattern for 6 pages, the Mincho character code and the Gothic character code are generally widely used (JIS code schiff).
Since it is not distinguished by JIS code, etc., if you write the Gothic font pattern for "Hikari" in the sector where the Mincho font pattern for "Hikari" was stored, it will become "Hikari".
It becomes possible to read out the Gothic font pattern for "Hikari" using exactly the same procedure as for reading out the Mincho font pattern for "Hikari". Therefore, the recording/reproducing control section 16 is instructed to write to the track address Tr and sector address Sc. This situation is shown in Figure 6.

Another method for writing the "light" Gothic font pattern in FIG. 6a is to search for an unrecorded sector and write in that sector. Recording/playback control section 1
6, track address Tr+m, sector address S
A write to the unrecorded sector of c+n is instructed, and a new “
The Gothic font pattern of ``Hikari'' is inlaid. In this case, both the Mincho font pattern and the Gothic font pattern for "Hikari" can be read out, resulting in 7 pages. This situation is shown in FIG. 6C.

Problems to be Solved by the Invention However, with the above configuration, when data is recorded, the sector is overwritten, so the data originally recorded in that sector is lost and cannot be used again. It becomes possible. In addition, in order to avoid this, when searching for unrecorded sectors and writing there, it takes time to search for unrecorded sectors, seek time when referencing newly written data, or disk rotation wait time.
The problem is that it is necessary to remember the address of a newly written sector.

In view of this, an object of the present invention is to provide an information recording/reproducing apparatus that can write data without losing the contents written in the sector to be written.

Means to solve problems The present invention only responds to light of a certain wavelength.

A first recording layer formed of a photosensitive recording member that transmits light of other wavelengths, and having a sector consisting of a sector identifier section in which address information is recorded and a recordable data area; Comparing an optical disc having a second recording layer having the same structure as the superimposed first recording layer, a reading means for reading the sector identifier section, and address information of the sector identifier section and a target sector address. address comparison means for recording/reproducing data on the first recording layer; first recording layer recording/reproducing means for recording/reproducing data on the second recording layer; and second recording layer recording/reproducing means for recording/reproducing data on the second recording layer. This is an information recording and reproducing device.

Function The present invention records/reproduces data in each of the first recording layer and the second recording layer using the above-described configuration.

Embodiment FIG. 1 shows a block diagram of an information recording/reproducing apparatus in an embodiment of the present invention. In FIG. 1, θ is a semiconductor laser that irradiates a laser beam onto the recording surface, 6 is a laser/9 page drive that drives the semiconductor laser 6, and 2 is a page drive that drives the laser drive 6 to provide address information from a sector identifier section (described later). 3 is a recording layer recording and reproducing section that drives the laser drive 6 to record/reproduce data on the first recording layer, which will be described later; 4 is a recording layer recording and reproducing section that drives the laser drive 6 and will be described later. A second recording layer recording/reproducing section 1 records/reproduces data on the second recording layer, and 1 drives the second recording layer recording/reproducing section 3 according to a given recording layer selection signal. A recording/reproducing control section 1a records and reproduces data by switching whether or not to drive the section 4. Reference numeral 1a denotes an address comparison section that compares a given target address with the result of reading address information from the address reading section 2.

FIG. 2 shows an optical disc applied in an embodiment of the present invention, and FIG. 2a is a plan view of the optical disc when viewed from the front side.
FIG. 2 is a sectional view taken along line A-A' in FIG. 2a. In Fig. 2, 7 is an optical disk, 8 is a center hole for mounting the optical disk on the disk motor, 9 is a recording surface, 1o is a disk base material other than polycarbonate resin,
13 is a first recording layer in which tracks are formed in the form of grooves on the D1O page substrate; 11 is a second recording layer in which tracks are also formed in the form of grooves; 14 is a laser with a specific wavelength λ1; 12 is a photosensitive recording member that reacts only to light and transmits laser light of other wavelengths; 12 is a photosensitive recording member that reacts only to laser light of a specific wavelength λ2 and transmits laser light of other wavelengths; The recording member 16 is a protective layer for protecting the photosensitive recording member 14. 81, 82, 33.・・・・・・
, Sn is the sector, 11a and 13a are sectors 31 and 32
゜S3. . . . Sector identifier portions 11b and 13b in which address information of Sn is recorded are data areas in which data can be recorded. G1 and G2 are gaps where no data is recorded to absorb rotational fluctuations of the optical disc.

The operation of the information recording/reproducing apparatus of this embodiment configured as described above will be explained below.

When a read command, a target sector address, and a recording layer selection signal are given to the recording/reproduction control section 1, the address reading section 2 drives the laser drive 6 to read out address information from the sector identifier section 13a.
It is sent to the address comparison section 1a. The address comparison unit 1a compares the sent address information and the target address and determines whether they match.

If the comparison results of the address comparison section 1a match, the recording/reproduction control section 1 causes the recording/reproduction section 3 to read the data if the recording layer selection signal indicates the first recording layer. If the recording layer selection signal indicates the second recording layer, the second recording layer recording/reproducing section 4 is instructed to read data. The second recording layer recording/reproducing section 3 drives the laser drive 6 to record data in the data area 1 using a laser beam of wavelength λ1.
Read the data of 3b. At this time, since the data area 11b of the second recording layer only transmits the laser beam of wavelength λ1, it does not affect the read data. The second recording layer recording/reproducing section 4 drives the laser drive 5 to read out data in the data area 11b using a laser beam of wavelength λ2. In this case as well, the data area 13b of the first recording layer
Since it only transmits the laser beam of wavelength λ2, it does not affect the read data.

The same applies when the write command, target sector address, and recording layer selection signal are given to the recording/reproduction control section 1.

FIG. 3 is an explanatory diagram of a case where a font pattern is stored in an optical disc that can be used in an embodiment of the present invention. Figure 3a
3 shows a font pattern area in the first recording layer, and FIG. 3 shows a font pattern area in the second recording layer. The operation for reading out the shifted pattern from this optical disc will be explained below.

In order to read out the Mincho font pattern of "Hikari", the recording/reproduction control section 1 receives the track address Tr of the first recording layer.
, an instruction is issued to read data from the sector at sector address Sc. When the address comparison unit 1a detects the sector with the track address Tr and the sector Φ address Sc, the recording/reproduction control unit 1 instructs the recording/reproduction unit 3 of the second recording layer to read data, and drives the laser drive 6. 1, the Mincho font pattern of light j recorded on page 13 of the data area 13b is read out using the laser beam of wavelength λ1.At this time, the data area 11b only transmits the laser beam of wavelength λ1. Therefore, it does not affect the read ``light'' font pattern.

Next, in order to read out the "light" Gothic font pattern, an instruction is issued to the recording/reproducing control section 1 to read out the sector data of the track address Tr and sector address Sc of the second recording layer. The recording/reproduction control unit 1 uses the address comparison unit 1a to determine the redrack address Tr,
When the sector with the sector address Sc is detected, the second recording layer recording/reproducing section 4 is instructed to read data, and the laser drive 6 is driven to read the data recorded in the data area 11b with a laser beam of wavelength λ2. Read out the font pattern of "Hikari". At this time, since the data area 13b only transmits the laser beam of wavelength λ2, it does not affect the read font pattern data.

Next, a description will be given of the operation when adding to, modifying, or changing the 14-page font pattern written in advance on this optical disc. Track address Tr+2 of the first recording layer as shown in FIG. 3a.

The Mincho font pattern of "Gaku" is stored in the sector at sector address Sc+1. When adding the Gothic font pattern of "Gaku" to this, the recording/playback control unit 1 sets the track ringing address TI+2 of the second recording layer.
An instruction is received to write the Gothic font pattern data of ``Gaku'' to the sector at 1 sector address Sc+1. The recording/reproduction control section 1 receives the track address Tr+2. by the address comparison section 1a. Sector address Sc
When the +1 sector is detected, the second recording layer recording/reproducing unit 4 is instructed to write data, the laser drive 6 is driven, and a Gothic font pattern of "Gaku" is written in the data area 11b with a laser beam of wavelength λ2.・Write data.

At this time, since the data area 13b only transmits the laser beam of wavelength λ2, the Mincho font pattern data of "Gaku" written in the data area 13b will be destroyed. good.

As described in detail, according to the present invention, data can be written without losing the contents previously written in the sector to be written, and unrecorded sectors are not required when adding data. , the search time for unrecorded sectors and the increase in used sectors can be reduced,
In addition, the seek time and disk rotation waiting time required to refer to newly added data can be reduced, so the practical effect is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an information recording/reproducing apparatus according to an embodiment of the present invention, FIGS. 2a and 2b are a plan view and an A-A' sectional view of an optical disc applied to the same embodiment, and FIG. An explanatory diagram when a font pattern is stored on an optical disk in the same embodiment, FIG. 4 is a block diagram showing the configuration of a conventional information recording and reproducing device, and FIGS. 5 a and b are applied to a conventional information recording and reproducing device. FIG. 6 is an explanatory view of a case where a font pattern is stored in an optical disk applied to a conventional information recording/reproducing apparatus. DESCRIPTION OF SYMBOLS 1... Recording/reproduction control section, 1a... Address comparison section, 2... Address reading section, 3...
. . . -th recording layer recording and reproducing section, 4 . . . second recording layer recording and reproducing section, 6 . . . laser drive, 6.
... Semiconductor laser, 7 ... Optical disk,
8... Center hole, 9... Recording surface, 10
... Disk base material, 13 ... First recording layer, 11 ... Second recording layer, 13a, 11a
...Sector identifier part, 13b, 11b...
...Data area, 12°14...Photosensitive recording member, 16...Protective layer. Name of agent: Patent attorney Toshio Nakao and 1 other person (Tom)

Claims (1)

[Claims] The first recording medium is made of a light-sensitive recording member that reacts only to light of a certain wavelength and transmits light of other wavelengths, and has a sector consisting of a sector identifier section in which address information is recorded and a recordable data area. an optical disc having a second recording layer having the same structure as the first recording layer and superimposed on the first recording layer, a reading means for reading the sector identifier section, and the sector identifier section. address comparison means for comparing address information of the target sector with a target sector address; first recording layer recording/reproducing means for recording/reproducing data on the first recording layer; and recording/reproducing means for recording/reproducing data on the second recording layer. 1. An information recording and reproducing device comprising a second recording layer recording and reproducing means for reproducing information.