JPS62172561A - Magnetic sheet device - Google Patents

Abstract

PURPOSE:To grasp the accurate storage state by operating and displaying a recordable unit number remained on a magnetic sheet from the recording state of a track from a detection means and mode information from a mode selection means. CONSTITUTION:A magnetic sheet is driven by a motor 2 and a head 3 is applied to recording/reproducing. A head drive mechanism 4 is operated by a drive pulse generating circuit 6 in a system control circuit 5 and a mode switch 15 moves the head 3 by 1 track each at the field recording and two tracks each at the frame recording. The recording/reproduction by the head 3 is selected by a changeover switch 8, which is controlled by a CPU 7. A reproducing signal is fed to a reproducing signal processing circuit 12 through a reproducing amplifier 11, a discrimination circuit 13 discriminates the presence of a recording signal and the result of discrimination is fed to the CPU 7. An operation circuit 14 operates the remaining recording enable number and displays the result on a display circuit 16. Thus, the accurate storage state is grasped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention records video signals and the like on a magnetic sheet. For example, the present invention relates to a magnetic sheet device used in an electronic still camera.

Conventional technology In electronic still cameras, the magnetic sheet used has a
A 0 track is provided, and since one field of video signal is recorded on this one track, signals for 5 o fields can be recorded on one sheet. Also, there is a field mode in which one image is made up of one field, and a frame mode in which one image is made by recording two fields each making up one frame on two adjacent tracks. Yes, even with one sheet,
60 sheets in field mode, 26 sheets in frame mode
Can record up to 100 images. Of course, it is possible that these two modes coexist on the same sheet, so the number of sheets to be recorded is an ambiguous value of 26 to 60 sheets per sheet.

For example, in a device such as a camera that records in digitally divided areas on a medium, a counter is provided to determine how many images can be taken. In other words, if you take 16 shots on a 24-shot film, you can naturally take 9 more shots. Of course, electronic still cameras also have this type of requirement, so it is common practice to display track numbers, which is extremely easy to do since the position of the head is displayed as is.

Problems to be Solved by the Invention However, with a simple track display, it may be possible to know the current number of photos, but it is difficult to obtain information on how many photos can be taken. In other words, it may not be possible to know whether or not there is a recorded track before that track, or whether there is an unrecorded track before it, and as mentioned above, even if the number of tracks is the same depending on the mode. , the number of recordable frames varies, and the number of recordable frames varies depending on the recording mode and recording conditions; for example, even if there are two tracks, if the tracks are separated from each other, the frame mode cannot be used. Therefore, it is extremely inconvenient for users. Recording may become impossible in unexpected places, causing confusion. Therefore, there is a need for a way to eliminate these problems and ensure that the user is informed of how many more images can be taken (and how much more can be recorded).

Means for Solving the Problems The present invention has been made in view of the above problems, and consists of a finite number of tracks formed in an annular shape on a magnetic sheet, each of which is independently recorded as a recording unit. mode, and
and another mode in which a plurality of the tracks are combined into one recording unit, a detection means for detecting the recording state of the track, a mode selection means for selecting the mode, and a recording state of the track obtained by the detection means. , a magnetic sheet device comprising arithmetic means for determining the number of remaining recordable units on a magnetic sheet from mode information obtained from a mode selection means, and a display means for displaying the result.

Effect of the Invention With the above-described configuration, the present invention calculates the remaining number of recordable units from the state of the recording track in accordance with each mode in which the recording format differs, so the numerical value displayed differs depending on the mode, and the recording status can always be accurately monitored. I can understand it.

EXAMPLE Hereinafter, an example in which the magnetic sheet device of the present invention is applied to the above-mentioned electronic still camera will be described with reference to the drawings.

FIG. 1 is a block diagram of the magnetic sheet device, and FIG. 2 shows the sequence of the device.

In FIG. 1, a magnetic sheet 1 is rotated by a motor 2, and a head 3 performs recording and reproduction. This head 3 is provided with two gaps separated by one track pitch in the direction of movement, and depending on the mode set by the mode switch 16, the head 3 can be moved to the outside without moving during frame recording. By using the inner gap, two fields constituting one frame are recorded one field at a time on two adjacent tracks.

Also, field recording @ always records only in the outer gap. Therefore, the head drive mechanism 4 is operated by a drive pulse generation circuit 6 in a system control circuit (hereinafter referred to as a system control circuit) 6 to move the head 3.
The mode switch 15 moves the head 3 by one track during field recording and by two tracks during frame recording.

Now, recording/reproduction by the head 3 is performed by C in the system controller circuit 6.
It is selected by a changeover switch 8 controlled by PU7. That is, on the recording RHO side, the input signal is FM modulated by the recording signal processing circuit 9 and the recording amplifier 10? Recording is performed by the head 3 throughout. Of course, this action is the release (
(not shown) and a system control circuit 6. On the reproduction PLAY side, the signal reproduced by the head 3 passes through the reproduction amplifier 11, is sent to the reproduction signal processing circuit 12, and is output after demodulation. At the same time, the determination circuit 13 determines the presence or absence of a recording signal, and the result is sent to the system controller 6 and processed within the CPU. At the same time, the arithmetic circuit 14 in the system control circuit 5 is connected to the driving pulse generating circuit 6 and C.
Based on the information from the PU 7, the remaining number of recordable sheets is calculated and output to the display circuit 16 for display. In this state, the head 3 performs recording and reproduction only in one direction. In other words, recorded tracks and unrecorded tracks do not intersect with each other, and when cuing up a track, it is achieved by playing back from the first track and finding the first unrecorded track. , there are only unrecorded tracks.

Now, these processing steps are shown in FIG. When the magnetic sheet 1 is installed into the apparatus, the outer gear lip of the head 3 is in the first track position.

(1) First, reset the counter in CPUr.

(2) The track (first track) in the outer gap portion of the head 3 is reproduced.

(3) Determine whether or not this track is recorded.

(4) If recorded, add 1 to the counter.

(5) If the counter is 50, it means that up to 60 tracks have already been recorded, so this magnetic sheet 1 can no longer record. That is, the process is finished and the magnetic sheet 1 is replaced.

Hit) If the counter does not reach 60 yet, set head 3 to 1.
Move the track and repeat the following steps (2) again.

(7) When an unrecorded track is found, the number of remaining unrecorded tracks, ie, the remaining number T in the case of field recording, is calculated as T=50-(counter value).

(8) Also, find the remaining frame recording number X by setting X=T/2 and rounding down to the decimal point.

(supply) The mode switch 16 determines whether field recording or frame recording is to be performed.

(10) For field recording, the remaining number T is displayed.

(11) If T=O, recording ends and the process ends.

(12) Repeat the following process until recording is instructed by the release (not shown) (9).

(qq) to -IBrr+ ,,, in k 2 4
) M al+! --,, -y'-tsg et al. -(14) Since it was recorded, add 1 to the counter.

(16) After moving the head 3 one track to the next track, (7) repeat the following process.

(16) If frame recording is selected in e), X is displayed as the remaining number of frames.

(17) Determine whether X=O.

(1a) If X = o, it is similarly determined whether T = 0, and if T is also 0, it means that everything has been recorded, so the process ends.

(1s) If T(o), there is still one unrecorded track remaining, so decide whether to record using field recording or not. If OK, repeat the steps below (10) and
If it is not K, the process ends.

(20) If X\0, wait for recording instruction with release (not shown).

(21) Recording is performed over two tracks in both the outer gap and the inner gap of the head 3.

(22) Since frame recording has been performed, add 2 to the counter.

(23) Move head 3 by 2 and 7 times and repeat the N year order.

By using the above procedure, the remaining number of shots that can be taken in the selected mode will always be displayed, making it easier for the user to use the electronic still camera without missing a photo opportunity or double recording. is obtained.

Now, in this embodiment, it is assumed that all the heads 3 move only in one direction, but it is of course possible that the heads 3 move only in one direction.

In addition, an erase function, blank feed, random recording, etc. can also be considered. In these cases, the above-mentioned configuration alone is not sufficient; for example, when the magnetic sheet 1 is attached, the recording state is searched over all tracks, and a counter for field recording and a counter for frame recording, that is, two
It is sufficient to provide a counter for knowing the number of consecutive unrecorded tracks and display the remaining tracks in the same way.

When recording, in the case of frame recording, it is necessary to perform the recording after detecting that both tracks are unrecorded.

Even if the camera has different modes than the electronic still camera described above, it can be configured in the same way by applying the above concept.

Effects of the Invention As is clear from the above description, the magnetic sheet device employing the present invention is extremely easy to use because it can always reliably inform the user of how much more data can be recorded.

If applied to electronic still cameras, the effect would be extremely large, such as preventing confusion and preventing missed photo opportunities.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment in which the magnetic sheet device of the present invention is applied to an electronic still camera, and Fig. 2 is a sequence diagram showing the operation of the device. ... Head, 4 ... Head drive mechanism, 5 ... System control circuit, 13 ... Discrimination circuit, 16 ... Mode switch, 16.・・・
...Display circuit 0

Claims (4)

[Claims] (1) A mode in which a finite number of tracks formed in an annular shape on a magnetic sheet are made into one recording unit independently, and another mode in which a plurality of tracks are collectively made into one recording unit. a detection means for detecting the recording state of the track; a mode selection means for selecting the mode; 1. A magnetic sheet device comprising: arithmetic means for calculating the number of remaining recordable units; and a display means for displaying the result. (2) When the mode selection means selects a mode in which a plurality of tracks are combined into one recording unit, the detection means or calculation means calculates the number of recordable units using the adjacent tracks. A magnetic sheet device according to claim 1, characterized in that the magnetic sheet device comprises: (3) The detection means is configured to perform recording or reproduction by sequentially moving a magnetic head in one direction, and detecting the number of recording tracks by knowing the amount of movement of the magnetic head. The magnetic sheet device according to scope 1. (4) One field of video signal is recorded on one track, and this one field forms one image.
There is a field mode in which one recording unit is recorded, and a frame mode in which two fields constituting one frame are recorded one field at a time on two adjacent tracks to form one image. ,
The magnetic sheet device according to claim 1, 2, or 3, characterized in that the mode is selected by mode selection means.