JPH01302580A - Recording system for optical recording medium - Google Patents

Abstract

PURPOSE:To shorten an access time when the number of recording tracks is small by starting the respective recording of a file part and a directory part from a track, which is near a border between these parts, and executing the recording in a direction, in which these parts goes to be respectively separated. CONSTITUTION:The information recording area of an optical recording card 1 is divided into a directory part 6, in which an index is recorded, and a file part 7, in which information are recorded. For these directory part 6 and file part 7, the recording is respectively started from the track near an area part and successively executed in the direction, in which these parts goes to be separated. Namely, for the directory part 6, the recording is started from the uppermost track of the area, an (l-1)-th track and DRAW (Direct Read After Write) is executed in a lower direction. For the file part 7, the recording is started from the lowest track of the area, and l-th track and the DRAW is executed toward an upper direction. Thus, when the recording quantity of the information is small, the access time can be shortened at the time of the recording and reproducing.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention relates to an optical recording medium called an optical recording card, in which information is recorded on an optical recording medium using, for example, a laser beam. Regarding the recording method.

(Prior Art) FIG. 8 shows an optical recording card that has already been proposed. In the recording section 2 of the optical recording card 1, a plurality of guidelines 3 are provided in advance along the longitudinal direction of the optical recording card 1, and the space between these guidelines 3 is called a track, and the information 5 is stored on this track 4. recorded. Further, on the left side of each track 4, . . .
As shown in the figure, a clock data code CC for synchronizing when recording and reproducing information 5, and each track 4,
A preformat data code PC is recorded in advance, which includes an identification code called a track number code TNC for identifying the track number code TNC, and a start code SC indicating the start position of the unrecorded portion.

The optical recording card 1 is reciprocated in its longitudinal direction by a transport system of a recording and reproducing apparatus (not shown), so that
Information is now recorded or reproduced using optical systems.

By the way, when a plurality of pieces of information are recorded on such an optical recording card 1 and the information is read, an operation called a track search is performed to read the track number and search for the track on which the target information is recorded. Subsequently, information is read.

In addition to regular information, we also provide information that makes it easier to find the information you are looking for.
A commonly used method is to record an index such as the name of the information and the track number on which the information is recorded at a predetermined position on the optical recording card 1.

An example of this is shown in FIG. That is, the information recording area of the optical recording card 1 is divided into two parts: a directory section 6 in which an index called a directory is recorded, and a file section 7 in which information called a file to be originally recorded is recorded.

The directory section 6 is composed of tracks 1 to 1-1, and the file section 7 is composed of tracks 1 to n.

Here, conventionally, in the directory section 6 and file section 7, recording starts from the bottom track of each area, and additional recording is performed upward.

In other words, the directory section 6 includes the first, second, third, . . .
- Records in the order of 1st to 1st tracks, and the file section 7 is
Recording is performed in the order of the 11th 1+1st, ++2nd, .

For this reason, the track search requires the optical system to move both when reading and recording information, and the moving distance has a large effect on the execution time.

Therefore, if recording starts from the bottom in both the directory section 6 and the file section 7 as in the past, the conditions for using the above-mentioned optical recording card are that the amount of information is small and the number of tracks recorded on the optical recording card 1 is small. When there are few, directories are recorded only in the lowest few tracks. This has the disadvantage that the distance between the recording position of the directory and the recording position of the file section is large, and it takes time for the optical system to move this distance.

That is, even though the number of recorded tracks is several, the actual execution time depends on the moving time of the optical system between tracks.

As a result, when the amount of information recorded is small, recording,
The disadvantage is that it takes a long time to access during playback.

(Problems to be Solved by the Invention) This invention eliminates the disadvantage that access time during recording and playback takes a long time when the amount of recorded information is small. An object of the present invention is to provide a recording method for an optical recording medium that can shorten access time during recording and reproduction.

[Structure of the Invention] (Means for Solving the Problems) The recording method of the optical recording medium of the present invention includes a plurality of guidelines disposed on the information recording area in parallel with the end surface of the optical recording medium, and the above guidelines. a plurality of tracks between which information is optically recorded, and the information recording area is divided into a file section where information is recorded and a directory section where an index etc. are recorded; Recording is started from the track closest to the boundary between the section and the directory section, and recording is performed sequentially in the direction moving away from each other.

(Operation) This invention provides an information recording area that is divided into a file section where information is recorded and a directory section where an index etc. is recorded, and where the file section and the directory section are close to the boundary between them. Recording is started from each track and recorded sequentially in the direction of moving away from each track. When the amount of information is small and the number of tracks to be recorded in the directory section and file section is small, the optical system moves. The distance traveled is short, and the access time during recording and playback can be shortened.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 2 shows an optical recording card (optical recording medium) according to the present invention, and since it has the same configuration as that explained in the conventional example, the same reference numerals are given and detailed explanation will be omitted. .

However, the directory section 6 and the file section 7 each start recording from a track close to the area, and recording is performed sequentially in the direction of moving away from each other, and the directory section 6 starts recording from the top track of the area. , and the file portion 7 starts recording from the bottom track of the area and continues writing upward.

In other words, the directory section 6 includes 1-1, 1-2, .
... Record in the order of the 2nd and 1st tracks, and store them in the file section 7.
are the 11th 1st + 1st, 1st + 2nd, ... n-1st, nth
It is designed to record in track order.

FIG. 3 shows a recording/reproducing apparatus according to the present invention. The transport system 20 holds the optical recording card 1 and moves the optical recording card 1 back and forth in its longitudinal direction.
A guide shaft 21 passes through this conveyance system 20, and a screw bolt 23 rotated by a drive motor 22 is screwed together. Further, the optical head 24 is provided facing the transport system 20. The optical head 24 irradiates light onto the optical recording card 1 held in the transport system 20 to record information, irradiates the optical recording card 1 with light, and detects reflected light from the optical recording card 1. By doing so, information recorded on the optical recording card 1 is read. A guide shaft 25 passes through the optical head 24, and a screw bolt 27 rotated by a drive motor 26 is screwed into the optical head 24. The optical head 24 moves in a direction perpendicular to the conveyance system 20 to move any track 4. It is possible to record and play.

FIG. 4 shows the configuration of the optical head 24. As shown in FIG. For example, light output from a semiconductor laser 30 is made into parallel light by a correction lens 31 called a so-called collimation lens, and then collimated by a grating plate (diffraction grating).
32, and is divided into three beams consisting of 0th-order light PQ, +1st-order light P+1, and -1st-order light P-1. These 3
The main beam consists of a beam splitter 33, a λ/4 wavelength plate 3
4 to the objective lens 35, and this objective lens 3
5 onto the optical recording card 1. The three beams reflected on the optical recording card 1 are each reflected by the beam splitter 33, guided to the photoelectric conversion element 37 via the imaging lens 36, and read.

The objective lens 35 is moved vertically (forcing) and horizontally (tracking) by a moving mechanism (not shown).

The photoelectric conversion element 37, as shown in FIG. 6, is composed of photodetection cells 37a, 37b, and 37c.

On the photoelectric conversion element 37 are the beams P+1 and POl.
An optical image is formed by the three light beams P-1. Here, the photodetection cell 37a is composed of a four-split photodetector in order to realize a well-known focus detection called astigmatism method using a cylindrical lens as the condensing lens, and the photodetection cell 37b137c has three photodetectors. This method is used for a well-known tracking detection called the beam method.

When recording and reproducing information, as shown in FIG. 5, among the three beams irradiated onto the optical recording card 1, for example,
The transport system 20 is moved in the longitudinal direction of the optical recording card 1 while moving the optical head 24 in the card lateral direction so that the primary beams P+1 and P-1 are irradiated onto the guidelines 3 located on both sides of the recording track 4. Move to the center 0th order light PO
It is used to record and read information.

In addition, when recording information on the optical recording card 1, it is necessary to check whether the beam is on the track to be recorded and to know the starting position of the unrecorded part before recording. , this is done as follows.

First, after reading the clock data code CC of the optical recording card 1 shown in FIG. 9 and synchronizing the recording and reproduction,
The track number code TNC is read to confirm the recording track. Immediately after reading the start code SC, the encoded information is recorded.

Also, during playback, the +1st order light P+1, -
The transport system 20 is moved while controlling the optical head 24 using the primary light P-1, the reflected light of the zero-order light PO is received by the photoelectric conversion element 37, and the information received is decoded. At this time, after synchronizing with the clock data code CC for decoding, reading the track number code TNC and reading the start code is the same as in recording.

FIG. 7 shows the main part of the electric circuit of the recording/reproducing apparatus. That is, the output from the photodetection cell 37a of the photoelectric conversion element 37 in the optical head 24 is binarized by the binarization circuit 42, and the binarized data is transmitted as reproduced (read) data via the CPU 40. and output to an external device (not shown). Further, recording data supplied from an external device is supplied to the laser drive circuit 41 via the CPU 40. As a result, the output of the laser drive circuit 41 causes 11. The semiconductor laser 30 in the optical head 24 is driven, and a laser beam spot is irradiated onto the optical recording card 1 to record data.

Further, the CPU 40 sends the optical head 2 to the track according to the recording position or the playback position from the external device.
4, the driver 46 is driven and the drive motor 26 is rotated. Furthermore, the above C
When the optical head 24 corresponds to a predetermined track, the PU 40 drives the driver 45 and rotates the drive motor 22 so as to follow the track.

The focus lens servo circuit 43 calculates the four outputs from the four-division detection cell 37a of the photoelectric conversion element 37, and moves the objective lens 35 based on the results, so that the distance between the objective lens 35 and the optical recording card 1 is adjusted. This is to adjust the distance.

The tracking servo circuit 44 includes the photodetection cell 57b.
, 57c, by supplying a current corresponding to the difference in detection outputs from the optical head 24 to a coil (not shown).
Tracking is performed by moving the objective lens 35 in the left-right direction (horizontal direction).

Next, in such a configuration, recording and reproducing of information will be explained with reference to the flowcharts shown in FIGS. 1(a) and 1(b).

``First, we will explain the case where information is recorded on a new card on which nothing is recorded. That is, when the CPU 40 is supplied with information to be recorded from the external bag gl (not shown), it moves the optical head 24 to the 1-1 track. Then, when the optical head 24 corresponds to track 1-1, the CPU 40 determines whether a directory is recorded in that track. As a result, CPU4
If 0 is determined that the directory is not recorded,
The first track is determined to be a track on which no information has been recorded. Based on this determination, the CPU 40 moves the optical head 24 to the first track. Then, when the optical head 24 corresponds to the first track, the CPU 40 records information (file) from the external device on that track. Furthermore, if there is information to be recorded, the CPU 40 moves the optical head 24 to the first +
1 track, etc., and record information from the external device on the corresponding track.

In this way, when the recording of information is finished, the CPU 24
moves the optical head to track 1-1, and records a directory or file index (information name, recording track number, etc.) corresponding to the above information on this track.

For example, if information can be recorded on two tracks, the information is recorded on the 11th 1+1 track and the directory is recorded on the 1-1 track. As a result, after recording information on the 1st+1st track, it is only necessary to move the optical head by 3 tracks, so that the recording processing time can be shortened.

Next, the case of additionally recording information on the card will be explained. That is, when the CPU 40 is supplied with information to be recorded from an external device (not shown), the CPU 40 causes the optical head 24 to move to the first position.
Move to -1 track.

Then, when the optical head 24 corresponds to the 1-1 track, the CPU 40 sequentially moves from the 1-1 track to the 1-2 track, etc., and checks whether a directory is recorded in the track or not. to judge. As a result, C
If the PU 40 determines that no directory is recorded, it determines that the track is an information-unrecorded track based on the contents of the directory before it. Based on this determination, the CPU 40 moves the optical head 24 to the corresponding track. and,
When the optical head 24 corresponds to that track, the CPU 4
0 records information (file) from the external device on that track. Additionally, if there is information to be recorded, the CP
U40 sequentially moves the optical head 24 to the next track, etc., and records information from the external device on the corresponding track.

In this way, when the recording of information is finished, the CPU 24
moves the optical head 24 to a track where the above-mentioned directory has not been recorded, and records on this track the directory corresponding to the above-mentioned information, that is, the file index (information name, recording track number, etc.).

As a result, as more data is recorded, the distance between the tracks between the file section 6 and the direct recording section 7 becomes larger, so the time required for movement becomes longer, but depending on the card specifications, if the amount of data is always small, the time is short enough. You can move between tracks with .

Next, the case of reproducing information recorded on a card will be explained. That is, when the CPU 40 receives a reproduction instruction from an external device (not shown), the CPU 40 controls the optical head 2.
4 to the 1-1 track. Then, when the optical head 24 corresponds to the 1-1 track, the CPU 40 sequentially moves from the 1-1 track to the 1-2 track, etc., and uses the directory in the track to read the information instructed to be reproduced. is recorded. As a result, when the CPU 40 determines that the corresponding information is recorded, it determines the information recording track in the file section 7 based on the contents of the directory. Based on this determination, the CPU 40 moves the optical head 24 to the corresponding track. Then, when the optical head 24 corresponds to that track, the CPU 40 reproduces the information (file) of that track. Furthermore, when reproducing information on the next track, the CPU 40 moves the optical head 24 to the next track and performs reproduction.

As described above, the directory section 6 and the file section 7' each start recording from the track closest to the area, and are sequentially recorded in the direction of moving away from each other. We started recording from the bottom track and continued writing towards the bottom, and in the file section 7, we started recording from the bottom track of the area and continued writing towards the top, so if the amount of recorded information is small, In addition, the distance traveled by the optical head is short, and the access time during recording and playback can be shortened.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a recording method for an optical recording medium that can shorten the access time during recording and reproduction when the amount of recorded information is small.

[Brief explanation of the drawing]

1 to 7 show one embodiment of the present invention, FIG. 1 is a flowchart for explaining the operation, FIG. 2 is a plan view showing the structure of the optical recording card, and FIG. A perspective view schematically showing a recording/reproducing device for an optical recording card, FIG. 4 is a configuration diagram showing the configuration of the optical system, FIG. 5 is a diagram showing the state of beam irradiation on the optical recording card, and FIG. FIG. 7 is a block diagram for explaining the configuration of the recording/reproducing device, and FIGS. 8 to 10 show conventional examples. 8th
and FIG. 10 are plan views showing the structure of the optical recording card.
FIG. 9 is a diagram showing the recording state within the track. DESCRIPTION OF SYMBOLS 1... Optical recording card (optical recording medium), 3... Guideline, 4... Tracing, 6... Direct portion. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 [3 Figure 5 Figure 6] Figure 7

Claims (1)

[Claims] The information recording area is provided with a plurality of guidelines arranged parallel to the end surface of the optical recording medium and a plurality of tracks on which information is optically recorded between the guidelines, and the information recording area is provided with a plurality of tracks on which information is optically recorded. In an optical recording medium that is divided into a file section to be recorded and a directory section to which an index, etc. is recorded, the file section and the directory section each start recording from a track near the boundary between them, and separate from each other. A recording method for an optical recording medium characterized in that recording is performed sequentially in various directions.