JPH02239470A - Optical disk device - Google Patents

Abstract

PURPOSE:To recognize a sector number by visual observation by deriving a 2nd sector number and a segment number which are positioned in the same phase as an end of a gap in a control track in the revolving direction of an optical disk. CONSTITUTION:At the time of accessing a user's track area, an ID data is latched with a specific value of a loop counter, and a sector number in the ID data and a segment number of dividing the sector are outputted from a computer. That is, if the sector number of a user's track 2 is such a value as not divided by three, a phase difference between three gaps 5 and a user's track preformat signal 3 is generated, so that the sector number of dividing the user's track 2 into plural pieces can be discriminated. By this method, from a phase relationship with the control track 4, the sector number in an area of the user's track 2 can be recognized by visual observation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device, and more particularly to an optical disc device suitable for visually recognizing the sector number of a write-once optical disc that complies with the ISO standard. [Prior Art] A technique that contributes to high-speed search processing by marking a specific mark on an optical disc and providing an infrared type photosensor to read the mark is known from Japanese Patent Laid-Open No. 57-103135. Due to the phase relationship between this mark and the address information section, the position in the disk rotation direction can be visually confirmed. [Problems to be Solved by the Invention] However, the above-mentioned conventional technology consists of an optical disk and an optical disk device as a pair, and cannot cope with cases where the phase relationship between the mark made on the optical disk and the address information becomes random. Also, it is necessary to install a dedicated sensor in the optical disc device. The purpose of this invention is. By detecting and outputting the phase relationship between the gap in the control track provided on a write-once optical disc that complies with the ISO standard and the position information data provided in advance on the user track, the sector number into which one track of the optical disc is divided can be visually recognized. The objective is to provide an optical disc device that makes it possible to [Means for Solving the Problems] In order to achieve the above object, in the present invention, after starting the optical disk device, the optical head accesses the control track, detects the gap formed in the control track, and outputs the detection signal. Starts the loop counter that repeatedly counts the value set in disk 1 @ rotation. From now on, when accessing the user track area, the ID data is latched with the specific value of the counter mentioned above, and the ID data is sent from the computer.
By outputting the sector 1 number in the D data and the segment number obtained by dividing the sector, the phase relationship between the control track gap and the user track sector can be determined, and the sector 1 number in the user track area can be visually recognized. [Operation] The loop counter of the optical disc device of the present invention is synchronized with the rotation of the disc. The starting point (count value φ) of this loop counter is defined as the end of one of the three gaps in the control track of the ISO standard write-once optical disc. After that, the user track is accessed, and the sector address data included in the preformat signal and the segment data for dividing the sector necessary for control within the device into multiple pieces are taken in and output using the specific value of the counter. The sector and segment addresses of the user track that are in the same phase with respect to the disk rotation direction as one of the ends of the three gaps of the control track of the optical disk are determined. If the number of sectors in user track 1 is not divisible by 3, there will be a difference in phase between the three gaps and the user track preformat signal. As a result, it is possible to determine the sector number in which the user track is divided into multiple parts from the sector address and segment address information obtained at the end of the gap. According to the above method,
Even if the phases of both the control track sector preformatted on the optical disc and the preformatted sector on the user track are random, it is possible to identify the sector number of the disc user track.
[Example] An example of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing an optical disc device as an embodiment of the present invention, and also includes a basic circuit of the optical disc device.

FIG. 2 is a plan view showing a specific example of an ISO standard write-once optical disc used in the present invention.

In Figure 2, an optical disc (1) has a control track (4), which divides the circumference of the track into three equal parts and is divided into three sectors. Each sector consists of gaps (5) and data that can be decoded by a microcomputer. In the user track (2), one round of the track is divided into a plurality of sectors, and position information (.ID signal) is preformatted at the beginning of each sector as a preformat signal (3). In this embodiment, one track will be explained as eight sectors.

Figure 3 shows the output signal waveforms from each block shown in Figure 1 (
2 is an explanatory diagram showing information detected by the optical head (7) when the optical disc shown in FIG. 2 is in a normal rotation state. FIG. First, the optical disc (1) is rotated by the disc rotation motor (6), and the optical head (
7) is lost to the inner control track 4 of the optical disc when the focus servo is ON. At that time, the optical head (
The information shown in Fig. 3(a) obtained in step 7) is transmitted to the preamplifier (8).
), a waveform equalization circuit (9), and a waveform shaping circuit (10), and is input to the microcomputer (15) as a shaped signal (10S). Microcomputer (15)
First, we recognize the gap (5), synchronize, and decode the data. When this gap (5) is recognized, the microcomputer (15) outputs (15
As S), the counter clear signal (25) is output for only one shot. With this counter clear signal (25), the count value of the loop counter (18) becomes φ, and thereafter it is incremented by the clock signal from the rotation synchronization clock circuit (17), and the counter value continues to increase. When this loop counter (18) reaches a specified count value, it becomes φ again, and the rotation synchronization clock circuit (17) and the count map value are set so that one revolution of the optical disc constitutes one loop. After the optical head (7) captures the control data on the control track (4). Tracking servo to O
Set it to N state and access the area of user track (2). In this state. Shaping from the waveform shaping circuit (10)
From fi issue (10S), synchronous clock regeneration circuit (1
1), synchronous signal detection circuit (1 2), demodulation circuit (13)
, by the ID information detection circuit (14), the optical disc (]
-) is converted into data and inputted to one end of an ID information latch circuit (21) as a track number, a sector number, and a segment number obtained by further dividing the sector. These address data change over time.

Next, the loop counter (18) is activated by the force counter clear signal (25) shown in Fig. 3, but when the count value reaches φ, the information of the gap (5) is
7) There is a delay of T1 time from the time of input.

Therefore, in the comparison circuit (19), the loop counter (1
By appropriately determining the setting value of the comparison value setting circuit (20) to be compared with the value of 8), the output of the comparison circuit (19) (
19S) is synchronized with the gap (5). Then, the position information data latched by the ID#N latch circuit (21) by this latch signal (26) is taken in by the microcomputer (15) and output to the monitor (16). This output is the track number, sector number, and segment number.The gap (5) of the control track (4) of the optical disc (1) and the preformat signal (3) of the user track (2) have different reflectances. Unlike, visual recognition is easy. Also, there are three gaps (5) in one rotation of the control track (4), while the user track (2) has one
If the number of sectors in a cycle is not divisible by 3, the lines of the preformat signal (3) will have different phases compared to the three gaps (5). From this, the segment number output from the microcomputer (15) indicates the phase from the preformat signal (3) at the beginning of the sector, and the phase of the preformat signal (3) with respect to the three gaps (5). Relationships can be visually determined. According to the above embodiment, the gap (
5), the sector and segment address data in the user track (2) is extracted, so there is no need to specially provide marks on the optical disc (1) or install a dedicated photosensor in the optical disc device. good. or,
The phase relationship between the gap (5) of the control track (4) and the preformat type S (3) of the user track (2) is not matched. It becomes possible to visually recognize a plurality of sector numbers on one track.

〔Effect of the invention〕

According to the present invention, in an optical disc device, it is possible to output the address information of a user track that is in the same phase as the gap of the control track of a write-once optical disc according to the ISO standard. This relationship makes it possible to visually recognize the sector number.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an optical disk device as an example of the present invention, FIG. 2 is a plan view showing a specific example of the optical disk used in the present invention, and FIG. 3 is a block diagram showing each block in FIG. FIG. 2 is an explanatory diagram showing the waveform of an output signal and information detected by an optical head. 1... Optical disc, 3... Preformat signal,
5... Gap, 17... Rotation synchronous clock circuit,
18...Loop counter, 19...Comparison circuit, 20
. . . Comparison value setting circuit, 21 . . . ID information latch circuit.躬Z fig.

Claims (1)

[Claims] 1. In an optical disc device that obtains desired information from a rotating optical disc, the optical disc has a control track and a user track, and the control track has one circumference divided into three equal parts. The user track is divided into three sectors (hereinafter referred to as the first sector), a gap is provided at the beginning of each first sector, and the user track is divided into a number of equal parts in which one circumference of the track is not divisible by three. and is divided into a plurality of sectors (hereinafter referred to as second sectors), and each second sector itself is also divided into a plurality of equal parts and divided into a plurality of segments, and each second sector is divided into a plurality of segments.
At the beginning of each sector of
It is a write-once optical disc that complies with the ISO standard, on which positional information data such as sector numbers and segment numbers are recorded, and the positional information data is detected from the user track of the rotating optical disc, and the positional information data is recorded. It is characterized by comprising means for deriving, from the detection results, the number of the second sector and the number of the segment at a position in the same phase as the end of a certain gap in the control track in the rotational direction of the optical disc. Optical disk device.