JPS59154885A - Magnetic disc and its recording and reproducing system - Google Patents

Abstract

PURPOSE:To prevent the quality of a still picture from being deteriorated at reproduction by providing plural video signal recording tracks to the outer circumference of a disc and providing a track for CUE signal recording to the inner circumference of the disc having relatively low recording density. CONSTITUTION:Fifty lins of tracks 1a for recording video signal having nearly 60mum of track width and nearly 40mum of guard band are provided to a position corresponding to the comparatively outer circumference of a magnetic disc, and tracks 1b for recording CUE signal are provided to a position corresponding to a comparatively inner circumference of the disc. The guard band between the CUE track 1b and the tracks 1a for recording video signal at the innermost circumference is nearly 140mum. The reason why the track 1a for recording video signal is set to the outer circumference of the disc, is that the high picture quality is required for the still picture, so that the video signal is recorded to the outer circumference of the disc having high linear velocity so as to extend as much as possible the video band.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a magnetic disk for electronically recording still images using a solid-state image sensor such as a CCD (charge-coupled device), and a recording/reproducing method thereof. It is something.

<Prior art> In general optical cameras that use conventional silver halide film, the film is developed after photography, and the necessary number of negatives desired by the photographer or other persons involved are printed onto photographic paper. ing. In this case, it is common to write the film number and number of copies that require extra prints on the package and request it from a camera store.

On the other hand, in the case of electronic still cameras, which have recently been developed, the subject is converted into electrical signals using COD and recorded on a magnetic disk. After that, put the recorded magnetic disk into a playback machine,
It can be reproduced as a still image on the screen of a television receiver. Also, if you connect it to a dedicated printer at the same time,
It is possible to obtain a hard copy similar to a conventional photograph.

<Problem> By the way, when it comes to using the latter electronic still camera,
This is not so much of a problem if the photographer, i.e. the user, owns not only a playback device but also a printer.
Since these remanufacturers and printers are very expensive, some users may have only a remanufacturer and no printer. In such a case, the user had to go to a camera store or a specific printer installation location as necessary, point out the printed area on the spot while looking at the playback screen, and request a copy.

<Problem Solving Means> The present invention has been made in view of the above points, and it is possible to provide a cue signal in advance to the inner periphery of the disk where the recording density is particularly low, separately from the video signal recording track on the magnetic disk. A cue track for recording is provided, and the user can optionally record desired and necessary information signals on this cue track.

<Examples> The present invention will be described below according to examples shown in the drawings. First, FIG. 1 shows a schematic pattern diagram of one embodiment of the magnetic disk of the present invention, and FIG. 2 shows an enlarged view of the main part thereof. Here, an example is shown in which a magnetic disk 1 with an outer diameter of 50mm is used, and in this case, a track width of 60mm is set at a position corresponding to the outer periphery of the disk with a diameter of 332mm to 43mm.
50 video signal recording tracks la, la,... with a guard band of 4 Qum between each track are provided, and cue signals are recorded at a position corresponding to the relatively inner circumference of a disk with a diameter of 32.8 mm. A track (hereinafter abbreviated as cue track) lb is provided. Note that this cue track lb and the innermost video signal recording track 1a
The guard band between the two is 140 μm.

Here, a video signal recording track la is placed on the outer periphery of the disk.
The reason for setting la... is that since still images or still photographs require high image quality, this video signal is recorded on the outer periphery of the disk where the circumferential speed is high to widen the video band as much as possible. Therefore, the magnetic recording characteristics in this case are best for the first track for recording video signals set at the outermost circumference, and at this time, the equivalent speed of the recording head and magnetic disk is 8.1 m/sec, and the highest recording frequency is 100 MHz.
Assuming that, the minimum recording wavelength is 0.81 μm.

On the other hand, the 5th part of the inner circumference of the disk has the worst condition.
At 0 track, the relative speed is 6.3 m/s and the minimum recording wavelength is 063 μm, which is the limit of performance even with iron oxide, which is the magnetic material of ordinary magnetic disks, as well as metal magnetic powder with high coercive force. becomes.

However, in Cue Track 1b, the data transfer rate of the information signal is usually 600 kilobits/second, which is extremely low compared to the video signal, and the recording wavelength can be as large as 10 μm. It can be used as a cue track for recording.

FIG. 3 is a schematic diagram illustrating the operation of the magnetic disk recording and reproducing system according to the present invention, in which 2 is a built-in solid-state image sensor such as a CCD, and the magnetic disk 1 of the present invention described above is loaded. This is an electronic still camera that photographs subjects in various situations. After the photographing is completed, the magnetic disk 1 is taken out from the still camera 2 and placed on the player 3.

Note that the magnetic disk 1 is housed in a hard case made of plastic, for example, for internal protection. When the magnetic disk 1 is inserted with its case into the disk insertion slot 3a of the player 3, it is automatically loaded. The playback output of this disc playback device 3 is supplied via a connection cable 4 to a television receiver 5 for monitoring. Note that this playback output is an RF multiplied signal for normal television broadcasting, a video signal, or an R,
G.

It may be a B signal. Further, 6 is a remote control transmitter, and this transmitter 6 is connected to the playback device 3 via a connection cable 7, and by operating the transmitter 6, the playback device 3
The operation can be controlled remotely. Of course, this transmitter 6 is not used, and the operation section 3 on the front of the player 3
It is also possible to directly operate the player 3 using b13b.

Note that the playback device 3 has not only a normal playback function of the magnetic disk 1 but also a function of recording on the cue track of the magnetic disk 1 according to the present invention, as will be described later. Therefore, in this playback device 1, while the user performs normal playback operations and sequentially projects both still images on the screen of the monitor television receiver 5, the user can remotely control the hard copy of each still image that is desired to be displayed. When a cue signal recording button 6a provided in advance on the transmitter 6 is pressed, track number information corresponding to the still image being displayed at that time is written into the memory built in the playback device 3. Of course, at this time, other information such as the number of copies required may also be written at the same time. Immediately before the magnetic disk 1 is taken out from the reproducing device 3 after the writing operation of the information signals to the memory is completed, these information signals are recorded all at once on the cue track on the inner circumference of the magnetic disk.

Thereafter, the magnetic disk 1 on which the desired information signal has been recorded by the player 3 is inserted into the disk insertion slot 8a of the printer 8.
When the disk 1 is inserted from the printer, the disk 1 is automatically loaded into the printer. The printer 8 first reproduces the information signal recorded in advance on the cue track of the magnetic disk, and then, based on the information signal, reproduces the video signal recorded on the video signal recording track with a predetermined number. The desired photograph 9 is printed as a hard copy on paper and taken out from the copy takeout port 8b.

As described above, by providing the cue track 11) on the inner periphery of the magnetic disk 1 and recording information desired by the user on this track in advance, each user does not have to own one printer 8. By installing it in a camera store or other specific location like a normal vending machine, the user can easily obtain the desired still image as a hard copy by bringing only the magnetic disk there. It becomes possible.

Next, the electronic still camera related to the present invention will be described in detail. This is configured, for example, as shown in the block diagram shown in FIG. 4. In this example, one field is 7.
A PA with a signal processing circuit that complies with the 60-second NTSC color television system.
The basic configuration is the same for the L and SECAM color television systems. In Figure 4, 10 is the subject, 11
is a lens, 12 is a solid-state image sensor such as a CCD,
A subject image incident through the lens 11 is converted into an electrical signal by the solid-state image sensor 12, and output as R, G, and H color signals. Reference numeral 13 denotes a signal processing circuit that separates and processes this color signal into a luminance signal and other necessary signals using a well-known method.
Three signals, Y) and (B-Y), are output. 14 is a shutter circuit having a shutter 14a, which is an electronic shutter whose shutter time is basically 1/3o second or 1/6o second. 15 is an FM modulation circuit that frequency-modulates the luminance signal and the color difference signal;
Each time a is pressed, this modulation signal is supplied to the magnetic head 16 for two fields, that is, one frame, and the magnetic disk 1-
The video signals are sequentially recorded on predetermined video signal recording tracks.

Reference numeral 17 denotes a generation circuit that uses a crystal resonator as a vibration source and generates an image sensor drive signal and a synchronization signal. 18 is a motor drive circuit that drives the direct drive motor 19;
0 is a head slide mechanism for moving the magnetic head 16 from the outer circumferential portion of the magnetic disk 1 to the inner circumferential portion by one track each time the shutter 14a is pressed and one image capturing is completed. Here, the magnetic disk 1 is rotated by a direct drive motor 19 at a rotation speed of approximately 3600 rotations/minute. (However, in the case of PAL and SECAM systems, 30
00 times/min. ) Next, a specific embodiment of the above regenerator 3 is shown in FIG. 5, and will be described in detail. This reproducing machine basically does not have a recording function on the video signal recording track of the magnetic disk, but has an information signal recording and reproducing function only on the innermost cue track. In FIG. 5, 22 is an FM demodulation circuit that demodulates the FM signal reproduced from the video signal recording track of the magnetic head 1 by the magnetic head 21 to obtain R, G, and B signals; NTS signal
24 is an RF converter that converts the video signal obtained from the encoder circuit 23 into a high-frequency television broadcast signal. 25, 26, and 27 are R, G, and B output terminals, respectively.
These are a video output terminal and an RF output terminal, and these terminals are appropriately selected and used according to the specifications of the television receiver 5 used.

Further, 28 is a track selection control circuit, 29 is a synchronization signal generation control circuit, and 30 is a magnetic head slide mechanism that moves the magnetic head 21 in the radial direction of the magnetic disk 1'' based on the control output of the track selection control circuit 28. 3 more
1 is a direct drive motor, and 82 is a motor drive circuit. Reference numeral 33 denotes a cue signal write/read control circuit, which is particularly relevant to the present invention, and this circuit has a built-in digital memory RAM.
Each time an information signal (cue signal) corresponding to a predetermined track number is supplied from the track number, the cue signal is sequentially written into the RAM. Then, after all write operations are completed and immediately before ejecting the magnetic disk 1, the track selection control circuit 2
8 gives the magnetic head slide mechanism 30 a command to move the magnetic head 2I to the innermost track, that is, the cue track, and the cue signal recording switch 35 is temporarily switched. A cue signal read from the RAM is digitally recorded on a cue track on the magnetic disk 1 by a magnetic head 21.

In this case, unless an instruction to erase is given to the signal previously recorded on the cue track, the signal is first read out and recorded once in the RAM, and then the cue track on the magnetic disk is read out along with the newly added cue signal using the method described above. will be re-recorded.

Note that in the above embodiment, in the regenerator 3 shown in FIG.
A cue signal write/read control circuit 33 with AM is added to have not only a simple video signal playback function but also a cue signal recording function on a magnetic disk. It would also be possible to have the electronic still camera 2 itself and record desired information signals at the time of photographing or the like.

FIG. 6 shows an embodiment of a printer used for making hard copies of the magnetic disk 1 of the present invention. This basic configuration is similar to the configuration of the regenerator 3 described in conjunction with FIG. That is, here, 36 is a magnetic head, 37 is an FM demodulation circuit, 38 is a video signal processing circuit, 39 is a synchronization signal generation control circuit, and 40
41 is a track selection control circuit, 41 is a magnetic head slide mechanism, 42 is a motor drive circuit, 43 is a direct drive motor, 44 is a cue signal readout control circuit, and 45 is a cue signal reproduction switch.

Normally, this switch 45 is connected to the FM demodulation circuit 3 as shown in the figure.
7 side, but only when the magnetic disk 1 is loaded into the printer for the first time, the queue signal readout control circuit 44
The cue signal readout control circuit 4 temporarily receives a command from
At this time, the cue signal is first reproduced from the cue track of the magnetic disk 1 by the magnetic head, and its contents are temporarily written to the RAM in the cue signal readout control circuit 44. After that, turn on the cue signal playback switch 4.
5 is switched to the original state shown, and at this time, track number information is sequentially output at regular intervals based on the cue signal read from the RAM of the cue signal readout control circuit 44 and supplied to the track selection control circuit 40. As a result, the slide mechanism 41 moves the magnetic head 36 on the magnetic disk 1 to a predetermined position, that is, a position corresponding to the track number, and the video signal previously recorded on that track is reproduced. The video signal thus reproduced is demodulated by the FM demodulation circuit 37 in the same manner as in the operation of the reproducing device 3 described above, and then the luminance signal is extracted from the video signal processing circuit 38. 46 is a frame memory, and 47 is a hard print mechanism. In this frame memory 46, the luminance signal obtained from the signal processing circuit 38 is once recorded for one frame, and then this signal is used for the operation of the hard print mechanism 47. The images are sequentially read out at a relatively low speed and printed on photo paper. When the printing operation for one sheet is completed in this way, the magnetic head 36 is moved based on the subsequent track number information read from the cue signal readout control circuit 44, and the same operation is repeated, and the hard print mechanism 47 sequentially prints the photo paper. be outed.

As the hard print mechanism 47 used here, a well-known printer such as a thermal type or an inkjet type may be used, but a color print mechanism may be used if necessary.

In the above embodiment, the cue track of the magnetic disk is
Although only the side number for recording the track number information that the user desires to hard copy as a cue signal has been described in detail, in addition to such track number information, other information desired by the user may be recorded as needed, such as recording. Information regarding the date, title, etc. may be recorded on this cue track.

<Effects> According to the magnetic disk of the present invention, a plurality of video signal recording tracks are provided at the outer periphery of the disk where the recording density can be high as described above, and the tracks for recording video signals are provided at the inner periphery of the disk where the recording density is relatively low. Since a track for recording a cue signal is provided in the recording medium, the quality of still images is not degraded particularly during playback, and various benefits can be achieved according to the user's wishes.

[Brief explanation of the drawing]

FIG. 1 is a pattern schematic diagram of an embodiment of a magnetic disk of the present invention, FIG. 2 is a partially enlarged view of the same embodiment, and FIG. 3 is a schematic diagram showing a magnetic disk recording and reproducing system according to the present invention.
FIG. 4 is a block diagram of an electronic still camera used in the system, FIG. 5 is a block diagram of a playback device, and FIG. 6 is a block diagram of a printer. DESCRIPTION OF SYMBOLS 1...Magnetic disk, 1a...Video signal recording track, 1b...Cue signal recording track, 2...
Electronic still camera, 8...player, 8...printer. Agent Patent attorney Aihiko Fukushi (and 2 others) 47

Claims (1)

[Claims] 1. In a magnetic disk having a plurality of signal recording and reproducing tracks, a plurality of video signal recording tracks are provided on the outer periphery of the disk where a high recording density can be achieved, while a plurality of video signal recording tracks are provided at a relatively low recording density. A magnetic disk characterized in that a cue signal recording track is provided on the inner circumference of the disk. 2. Video signal information is recorded on a plurality of tracks on the outer circumference of a magnetic disk having a plurality of signal recording/reproducing tracks, and cue signal information desired by the user is recorded on at least one track on the inner circumference of the magnetic disk. What is claimed is: 1. A recording/reproducing method for a magnetic disk, characterized in that upon reproduction, first, cue signal information is reproduced, and then video signal information is reproduced based on this cue signal information.