JPH025223A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the faults for the subsequent signal processing jobs by providing a control means which updates the recording tracks to record the information another unrecorded track when the information already recorded on the track is confirmed. CONSTITUTION:It is decided whether the information is already recorded or not on a due track 14 via the previous recording actions 15 when an optical recording medium 11 is put into an optical recording an reproducing device. When the recorded information is confirmed, no information is recorded on the track 14 any more even though the track 14 includes an unrecorded area where the information can be additionally recorded. Then the information is recorded on another track 14 including no recorded information. Thus the recording time points of the information 15 can be integrated for each track 14. Therefore the coincidence of diameters of the pits 16 can be secured for each track 14 among the recording time 15a preceding the previous recording time 15b, the time 15b and the present recording time 15c respectively. Thus it is possible to eliminate the amplitude change of a waveform among sectors of a single track 14 and to eliminate the faults for the subsequent signal processing jobs.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention makes it possible, for example, to record information in sector units on each recording track of an optical recording card in which a plurality of recording tracks are formed. The present invention relates to an optical recording/reproducing device.

(Prior Art) As is well known, optical recording cards (optical recording media) on which optically read information (data) is optically written have been developed. In this type of optical recording card, a hole called a bit is formed by irradiating a laser beam using a card handling device (optical recording/reproducing device). Information is recorded (written) based on the difference in reflectance between the two.

By the way, an optical recording card is provided with a plurality of recording tracks on which information is recorded along the longitudinal direction of the card, and it is possible to handle different information on a sector-by-sector basis within one recording track. There is. In an optical recording card with such a configuration, it is possible to record several sectors worth of information on one recording track, and information recording (additional writing) to the same track is not performed until several sectors worth of information has been recorded. It is becoming more and more popular. When the number of recordable sectors is exceeded, information is recorded on another recording track.

However, in an optical recording card, as shown in FIG. 8, for example, the shape of the pits (a) 16 may change due to aging. Therefore, when information from different recording sections is mixed on one recording track, there is a difference between the latest added information (indicated by sector Sc) and the previously recorded information (indicated by sectors Sb and Sa). The amplitude of the waveform in the reproduced signal (b) differs. In this way, if the amplitudes of the waveforms in the reproduced signal are extremely different, this change in amplitude may cause problems such as jitters occurring at the change of sectors during later signal processing, such as during binarization. was.

(Problems to be Solved by the Invention) This invention solves the problem that, because the shape of bits may change due to changes over time, information from different recording sections is mixed in one recording track, and information about the additional information and This was done to eliminate the drawback that when the amplitude of the waveform in the reproduced signal is extremely different from the previously recorded information, this amplitude change becomes an obstacle in later signal processing. It is an object of the present invention to provide an optical recording and reproducing apparatus that can change the amplitude of a waveform in a reproduced signal for one recording track and eliminate obstacles in subsequent signal processing.

[Configuration of the Invention (Means for Solving the Problems) The optical recording/reproducing apparatus of the present invention uses an optical recording medium capable of recording information sector by sector on a plurality of recording tracks formed on an optical recording medium. In a recording/reproducing device, when an optical recording medium is inserted into the device, a determining means determines whether or not information is already recorded on a track on which information is to be recorded; If it is determined that there is information, the recording track is updated and the information is recorded on another track where nothing is recorded.

(Function) When an optical recording medium is inserted into an optical recording/reproducing device, the present invention determines whether or not information has already been recorded in the track on which information is to be recorded by previous recording, and based on this determination, the recorded If the existence of information is confirmed, even if there is an unrecorded area that can be additionally written to the track, the information will not be recorded to that recording track, and the information will not be recorded to another track where recorded information does not exist. By recording information on the recording track, the change in the amplitude of the waveform in the reproduced signal for one recording track is kept constant.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 3 shows an optical recording card as an optical recording medium. The recording section 12 of the optical recording card 11 contains the card 1.
1, a plurality of tracking guides 13 are provided in advance in an optically readable pattern. These tracking guides 13...
The spaces between the tracks 14 and 14 are called tracks (recording tracks) 14, and information (data) 15 is recorded in each track 14 according to a predetermined recording format.

The recording format is, for example, as shown in FIG.
It consists of a track address information section and an information recording section. The track address information section is, for example, management information for the track 14 recorded in advance on the card 11, and consists of a trailing section and a track ID section.

The above trailing section contains information 15 in the information recording section.
A clock signal used for recording/reproducing is recorded. Information for managing the entire track 14, such as a track number, is recorded in the track ID section.

The information recording section is made up of several sectors S, ~sn, and each sector S1~Sn is made up of a sector ID and a data field, respectively. The sector ID section records information for managing the sector, such as a track number and a sector number. The data field is an area in which information 15 in the sector is recorded.

FIG. 5 shows a card handling device (optical recording/reproducing device) for the optical recording card 11. As shown in FIG. The transport system 20 holds the optical recording card 11 inserted through an insertion/ejection opening (not shown), and moves the card 11 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 motor 22 is screwed together.

On the other hand, the optical system 24 is provided facing the transport system 20. This optical system 24 irradiates light onto the optical recording card 11 held in the transport system 20 to form pits 16, and irradiates light onto the optical recording card 11 to generate reflected light depending on the presence or absence of pits 16. It is something to detect. This optical system 24
A guide shaft 25 passes through the guide shaft 25, and a screw bolt 27 rotated by a motor 26 is screwed into the guide shaft 25. By moving in a direction perpendicular to the conveyance system 20, an arbitrary track 14 can be recorded/recorded. It is said that it is possible to play.

FIG. 6 shows the configuration of the optical system 24. For example, the light output from the semiconductor laser 30 is made into parallel light by a correction lens 31 called a collimation lens, and is then irradiated onto a grating plate (diffraction grating) 32 to produce 0th order light PO, +1st order light. P+1, -1
It is divided into three beams consisting of the order light P-1. These three beams PO, P+1. P-1 is connected to the objective lens 35 via the beam splitter 33 and the λ/4 wavelength plate 34.
The optical recording card 1 is guided by this objective lens 35.
1. The three beams PO, P+1°P-1 reflected on the optical recording card 11 are each reflected by the beam splitter 33 and sent to the imaging lens 3.
6 to the photoelectric conversion element 37, where it is read as an electric signal (reproduction signal). That is, when recording/reproducing information, as shown in FIG. 7, three beams PO, P+1 . Among P-1, for example, ±1st order light P+1. While moving the optical system 24 in the lateral direction of the card 11, the transport system 20 is moved in the longitudinal direction of the card 11 so that the tracking guides 13.13 located on both sides of the corresponding track 14 are irradiated with P-1. By moving the zero-order light PO to an arbitrary position of the track 14, the zero-order light PO is made to correspond to the position of an arbitrary track 14.

When recording information 15 on the optical recording card 11, the 0th-order light PO corresponds to the position of the track 14 to be recorded, ±1st-order light P+1. The optical system 24 is controlled using P-1 (tracking and focusing control). At the same time, the transport system 20 is moved, and in this state, the light intensity of the semiconductor laser 30 is changed according to the data that is divided into sectors and coded, so that the track 14 is formed with a pit 16, for example, a low reflection light. A rate hole is formed.

On the other hand, when reproducing information 15, ±1st order light P+1.
The transport system 20 is simultaneously moved while controlling the optical system 24 using P-1. Then, in a state where the 0th order light PO corresponds to the position of the track 14 to be reproduced,
The reflected light obtained from the track 14 is transmitted to the photoelectric conversion element 3
7, it is converted by the photoelectric conversion element 37 into a reproduction signal according to the presence or absence of the pit 16, that is, the change in the amount of reflected light obtained from the pit 16 portion and the other portion. The information 15 is reproduced by subjecting this reproduced signal to binarization processing by slicing or differentiation, for example, in a processing circuit (not shown).

The motors 22, 26 and the semiconductor laser 30 constituting the optical system 24 are controlled by a control unit (not shown), and in this control unit (processing circuit), they are controlled by a reproduced signal from the photoelectric conversion element 37. Information 15
is now being played.

Incidentally, the diameter of the pits 16 formed on the optical recording card 11 changes due to aging, for example. That is, as shown in FIG. 8, the longer it is left unused, the larger the diameter of the pit 16 immediately after recording, indicated by sector Sc, becomes, for example, the sector sb that has already been recorded by the previous and previous recordings. The diameters of the pits 16 indicated by sectors Sa and Sector Sa are respectively smaller. In this way, in the case where the diameter of the pit 16 changes depending on the difference in elapsed time after recording, when detecting a change in the reflected light with the beam PO at the same level, it is natural that the reproduced signal by the photoelectric conversion element 37 A difference arises in the amplitude of the waveform at . Therefore, if sectors with different elapsed times after recording are mixed in one track 14, the amplitude of the waveform in the reproduced signal will differ for each sector, and this change in amplitude will cause problems in later signal processing. It's coming.

Therefore, when recording the information 15 on the optical recording card 11,
When the optical recording card 11 is inserted into the card handling device,
It is determined whether the recorded information 15 recorded in the previous recording already exists in the track 14 on which the information 15 is to be recorded, that is, the presence or absence of a sector in the track 14, and the existence of one or more sectors is determined. If it is determined, the track 14 is updated and the information 15 is recorded on the track where there is no sector recorded before the current insertion. That is, optical recording card 1
1 is inserted into the card handling device, first, by controlling the motor 26, the optical system 24 is made to access the track 14 to be recorded in accordance with an instruction from, for example, a host device (not shown). And semiconductor laser 3o
The ±1st-order light P+1. P-1, the optical system 24 is moved in the transverse direction of the card 11, and the transport system 2 is moved so that the zero-order light Po corresponds to the position of the track 14.
0 in the longitudinal direction of the card 11.

In this state, the card 11 by the 0th order light Po necessary for reproduction.
The photoelectric conversion element 37 receives changes in the reflected light from the
Based on the reproduced signal from the photoelectric conversion element 37, the presence or absence of a sector in the track 14 is determined. If the existence of a sector is not confirmed by this determination, recording of the information 15 is started on the track 14 as described above.

Further, if the existence of a sector is confirmed by the above-mentioned determination, no additional writing is performed on the track 14, and the motor 26
is controlled to move the optical system 24 to another track 14. Then, the existence of a sector in the track 14 is determined as described above, and a track 14 in which the existence of a sector is not confirmed is searched and information 15 is recorded.

As a result, the recording time of the information 15 on each track 14 can be unified, so that the diameter of the pit 16 for each track 14 is made to match the previous information 15a1 the previous time 15b1 the current time 15c, respectively, as shown in FIG. becomes possible. As a result, as shown in FIG.
Changes in waveform amplitude between sectors of the two tracks 14 can be eliminated.

As mentioned above, when an optical recording card is inserted into a card handling device, it is determined whether or not information has already been recorded in the track where information is to be recorded. If the existence of recorded information is confirmed, even if there is an unrecorded area remaining on the track that can be additionally written, information will not be recorded to that recording track, but information will be written to another track where recorded information does not exist. By recording, the change in the amplitude of the waveform in the reproduced signal for one recording track is made constant.

In other words, when an optical recording card is inserted into a handling device when recording information, the data is inserted/ejected by the insertion/ejection operation of the optical recording card so that the above information is recorded (added) on a track where the existence of a sector is not confirmed. The recording track is constantly updated. This makes it possible to unify the time at which information is recorded on each track, and to make changes in pit diameters due to aging or the like consistent within the tracks. Therefore, it is possible to eliminate changes in the amplitude of the waveform between sectors of one track and to keep the amplitude of the waveform in the reproduced signal constant.
This makes it possible to eliminate changes in the amplitude of the waveform in the reproduced signal between the additionally recorded information and the previously recorded information, which would be a hindrance in later signal processing.

Note that this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, an optical recording/reproducing system can eliminate variations in waveform amplitude in a reproduced signal for one recording track and eliminate obstacles in subsequent signal processing. equipment can be provided.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention,
Figure 1 is a diagram showing an example of recording information, Figure 2 is a waveform diagram showing differences in amplitude in each reproduced signal, Figure 3 is a plan view showing the configuration of an optical recording card, and Figure 4 is an example of a recording format. FIG. 5 is a perspective view schematically showing the configuration of the card handling device, FIG. 6 is a configuration diagram schematically showing the optical system, and FIG.
The figure is a diagram shown to explain the beam irradiation state.
FIG. 8 is a diagram shown to explain the prior art and its problems. DESCRIPTION OF SYMBOLS 11... Optical recording card (optical recording medium) 12... Recording part, 13... Tracking guide, 14... Track (recording track), 16... Bit, 20... Transport system, 22 ...Motor, 24...Optical system, 26...
- Motor, 30... semiconductor laser, 37... photoelectric conversion element. Applicant's agent Patent attorney Takehiko Suzue14Figure 1Figure 2゜Figure 5Figure 6Figure 7

Claims (1)

[Scope of Claims] An optical recording/reproducing device capable of recording information sector by sector on a plurality of recording tracks formed on an optical recording medium, wherein when an optical recording medium is inserted into the device, information is recorded in a plurality of recording tracks formed on an optical recording medium. A determining means for determining whether or not there is already recorded information on the track to be recorded, and if the determining means determines that there is already recorded information, the recording track is updated and nothing is recorded. 1. An optical recording and reproducing apparatus comprising: a control means for recording information on another track that is not recorded.