JPH0514475B2 - - Google Patents

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 printing on the packaging 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 a CCD and recorded on a magnetic disk. The recorded magnetic disk can then be loaded into a playback machine and reproduced as a still image on the screen of a television receiver. At the same time, if you connect it to a dedicated printer, you can get a hard copy similar to a conventional photo.

<Problem> By the way, when using the latter electronic still camera, it is not so much of a problem if the photographer, i.e. the user, owns not only a playback device but also a printer. Because they are very expensive, some users may only have a remanufactured machine and do not own a 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 watching the playback screen, and request a copy.

<Means for Solving Problems> The present invention has been made in view of the above points, and is designed to provide a queue 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 arbitrarily record desired and necessary information signals on this cue track.

<Example> The present invention will be described below according to an example 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 essential parts. Here we show an example using magnetic disk 1 with an outer diameter of 50 mm, in which case the diameter is 33.2 mm.
50 video signal recording tracks 1a, 1a, ... with a track width of 60 μm and a guard band between each track of 40 μm were installed at a position corresponding to the outer circumference of the disk, which was approximately 43 mm in diameter, and 32.8 mm in diameter. A track for recording cue signals (hereinafter abbreviated as cue track) is located at a position relatively corresponding to the inner circumference of the disk.
1b. The guard band between this queue track 1b and the innermost video signal recording track 1a is set at 140 μm.

The reason why the video signal recording tracks 1a, 1a... are set on the outer periphery of the disk is that still images or still photographs require high image quality.
This is to record this video signal on the outer periphery of the disk where the circumferential speed is high and 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, which is set at the outermost circumference, assuming that the equivalent speed of the recording head and magnetic disk is 8.1 m/sec, and the maximum recording frequency is 10 MHz. In this case, the minimum recording wavelength is 0.81 μm. On the other hand, the inner periphery of the disk has the worst conditions.
For 50 tracks, the relative speed is 6.3 m/s,
The minimum recording wavelength is 0.63 μm, which is the limit for ensuring performance not only with iron oxide, which is the magnetic material in ordinary magnetic disks, but also with metal magnetic powders with high coercive force.

However, in the Q-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, so the information signal can be transmitted even in the low relative speed region of the inner circumference where the video signal cannot be recorded. It can be fully 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.
is an electronic still camera which has a built-in solid-state image sensor such as a CCD and which photographs a subject with the above-described magnetic disk 1 of the present invention loaded therein. 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 connected to a television receiver 5 for monitoring via a connection cable 4.
supplied to Note that this playback output is an RF signal for normal television broadcasting, a video signal, or 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 operation of the playback device 3 can be remotely controlled. Of course, it is also possible to directly operate the player 3 using the operating sections 3b, 3b on the front of the player 3 without using the transmitter 6.

Note that the above-mentioned player 3 is simply a magnetic disk 1.
In addition to the normal playback function of the magnetic disk 1, it also has a recording function 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 projects still images one after another on the screen of the monitor television receiver 5, a remote control is performed each time a still image of which the user desires a hard copy is displayed. Queue signal recording button 6 provided in advance on the transmitter 6
Each time a is pressed, track number information corresponding to the still image being displayed at that time is written into the memory built into 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. When the magnetic disk 1 is taken out from the player 3 after the writing operation of the information signal to the memory is completed,
Immediately before that, these information signals are recorded all at once on a cue track on the inner circumference of the magnetic disk.

Thereafter, when 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, this 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 and taken out from the copy takeout port 8b.

As described above, if the queue track 1b is provided on the inner periphery of the magnetic disk 1 and the information desired by the user is recorded on this track in advance, even if each user does not own one printer 8, the printer 8 can be used. By installing it in a store or other specific location like a regular vending machine, the user can easily obtain the desired still image as a hard copy by bringing only the magnetic disk there. becomes.

Next, the electronic still camera to which the present invention relates will be described in detail. This is constructed, for example, as shown in the block diagram of FIG. 4. This embodiment will be explained below assuming that it has a signal processing circuit in accordance with the NTSC color television system in which one field is 1/60 seconds, but it is assumed that one field is 1/50 seconds.
The basic configuration is the same for PAL and SECAM color television systems. In FIG. 4, 10 is an object, 11 is a lens, and 12 is a solid-state image sensor such as a CCD.The object image incident through the lens 11 is converted into an electrical signal by the solid-state image sensor 12, and R, G, and B are converted into electric signals. Output as a color signal. 13 is a signal processing circuit that separates and processes this color signal into a luminance signal and other required signals using a well-known method; here, a luminance (Y) signal and two color difference signals (R
-Y) and (B-Y) are output.
14 is a shutter circuit having a shutter 14a;
It is an electronic shutter whose shutter time is basically 1/30 second or 1/60 second. Reference numeral 15 denotes an FM modulation circuit that frequency-modulates the luminance signal and color difference signal, and each time the shutter 14a is pressed, this modulation signal is supplied to the magnetic head 16 for two fields, that is, one frame, and is used to generate a predetermined video signal on the magnetic disk 1. The data are recorded sequentially on the recording track. 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, and 20 is a motor drive circuit that moves the magnetic head 16 one track from the outer circumference of the magnetic disk 1 to the inner circumference every time the shutter 14a is pressed and one image capturing is completed. This is a head slide mechanism that allows the head to be moved step by step. Here, the magnetic disk 1 is rotated by a direct drive motor 19 at a rotation speed of about 3,600 rotations/minute. (However, in the case of PAL, SECAM method, 3000 times/
It's a minute. ) Next, a specific example of the above-mentioned regenerator 3 will be explained in the fifth section.
This is shown in the figure 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 the function of recording and reproducing information signals 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; signal
An encoder circuit 24 converts the video signal into a video signal conforming to the NTSC system, and 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, 27 are R, G, B output terminals, video output terminals,
These terminals are RF output terminals, 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, 30 is a magnetic head slide mechanism for moving the magnetic head 21 in the radial direction on the magnetic disk 1 based on the control output of the track selection control circuit 28, and 31 is a direct drive motor, and 32 is a motor drive circuit. 3
Reference numeral 3 denotes a queue 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 (queue signal) corresponding to a track number is supplied, the queue signal is sequentially written into the RAM. After all the write operations have been completed and immediately before ejecting the magnetic disk 1, a command is given from the track selection control circuit 28 to the magnetic head slide mechanism 30 to move the magnetic head 21 to the innermost track, that is, to the cue track, and at the same time record a cue signal. The switch 35 is temporarily switched, and at this time, the queue signal read from the RAM in the queue signal write/read control circuit 33 is transferred to the magnetic disk 1 by the magnetic head 21.
recorded digitally on the queue track above. In this case, unless a deletion instruction is given to the signals previously recorded on the queue track, they are first read out and recorded once in the RAM, and then rewritten to the queue track on the magnetic disk using the method described above along with the newly added queue signals. recorded.

In the above embodiment, a cue signal write/read control circuit 33 having a RAM is also added to the playback device 3 shown in FIG. 5, so that it has not only a simple video signal playback function but also a cue signal recording function on a magnetic disk. However, by providing the electronic still camera 2 with a recording function for such cue signals,
It would also be possible to record desired information signals at the time of photographing or the like.

FIG. 6 shows an embodiment of a printer used for copying codes 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, 40 is a track selection control circuit, 41 is a magnetic head slide mechanism, 4
2 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 set to FM as shown in the figure.
Although it is connected to the demodulation circuit 37 side, it is temporarily switched to the queue signal readout control circuit 44 side by a command from the queue signal readout control circuit 44 only when the magnetic disk 1 is loaded into the printer for the first time. A queue signal is reproduced from the queue track of the magnetic disk 1 by the magnetic head, and its contents are stored in the queue signal readout control circuit 44.
It is written to RAM once. After that, the cue signal reproduction switch 45 is switched to the original state shown in the figure, and at this time, the cue signal readout control circuit 44 is turned on.
Based on the queue signal read from the RAM, track number information is sequentially output at regular intervals and supplied to the track selection control circuit 40. As a result, the slide mechanism 41 moves the magnetic head 36 to a predetermined position on the magnetic disk 1, that is, a position corresponding to the track number, and the video number 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
47 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 adjusted to the operating speed of the hard print mechanism 47. The images are sequentially read out at a relatively low speed and printed on photo paper. In this way, each time the printing operation for one sheet is completed, the magnetic head 36 is moved based on the subsequent track number information read out from the queue signal readout control circuit 44, and the same operation is repeated, and the hard print mechanism 47 prints the photo paper one by one. 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, only the example in which the track number information that the user desires to have as a hard copy is recorded as a queue signal on the queue track of the magnetic disk was described in detail. Other information desired by the user, such as information regarding the shooting date, title, etc., may be recorded on this cue track.

<Effects of the Invention> As described above, in the magnetic disk recording/reproducing system of the present invention, a plurality of signal recording/reproducing tracks are provided concentrically and are driven to rotate at a constant speed. A magnetic disk in which video signals are recorded on the tracks of a book in order from the outer track, means for reproducing the video signals from the magnetic disk, and means for demodulating the reproduced video signals into signals for supplying to a television receiver. , means for displaying the video signal of the magnetic disk on a television receiver and recording an information signal corresponding to a track number in which an image necessary for printing is recorded on the innermost track of the magnetic disk. Since it consists of a recording and reproducing device, it displays images recorded on a magnetic disk on a television receiver, checks for images that require hard printing, and transfers information corresponding to the track number on which the image is recorded to the magnetic disk. can be written to.

Furthermore, since the information is recorded on the innermost circumference of the magnetic disk where the recording density is relatively low, the recording surface of the magnetic disk can be effectively utilized.

[Brief explanation of the drawing]

FIG. 1 is a schematic pattern diagram of one embodiment of a magnetic disk according to the present invention, FIG. 2 is a partially enlarged view of the same embodiment, and FIG. 3 is a schematic diagram showing a recording and reproducing system for a magnetic disk 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 recording/reproducing device, and FIG. 6 is a block diagram of a printer. 1...Magnetic disk, 1a...Video signal recording track, 1b...Queue signal recording track,
2...Electronic still camera, 3...Player, 8...
printer.

Claims (1)

[Scope of Claims] 1. A plurality of signal recording and reproducing tracks are provided concentrically and driven to rotate at a constant speed, and video signals are sequentially transmitted to the plurality of tracks on the outer periphery where a high recording density can be achieved, starting from the tracks on the outer periphery. A magnetic disk for recording, a means for reproducing a video signal from the magnetic disk, a means for demodulating the reproduced video signal into a signal for supplying to a television receiver, and a means for displaying the video signal on the magnetic disk to a television receiver. a recording and reproducing device comprising means for recording an information signal corresponding to a track number on which an image necessary for printing is recorded on the innermost track of the magnetic disk; and a magnetic disk recording and reproducing system comprising: .