JPH0734286B2 - Magnetic sheet device - Google Patents

Description

TECHNICAL FIELD The present invention records a video signal 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 is 50
Although a track is provided, a video signal for one field is recorded on this one track, so that a signal for 50 fields can be recorded on one sheet. In addition, the field mode in which one image is composed of one field and the adjacent two
There is a frame mode in which two fields that make up one frame are recorded on each track, and one field is recorded to make one image. Even one sheet has 50 sheets in field mode and 25 sheets in frame mode. Images can be recorded. Of course, it is possible that these two modes coexist on the same sheet, so the number of recorded sheets is 1
It is an ambiguous number of 25 to 50 sheets per sheet.

For example, in a device, such as a camera, which records in each area digitally divided on a medium, a counter is provided to know how many more sheets can be taken. That is, for a film of 24 shots
You can see that if you have taken 15 shots, you can inevitably take 9 more. Needless to say, even in the electronic still camera, the track number is generally displayed because of this kind of request, which is extremely easy because the position of the head is displayed as it is.

Problems to be Solved by the Invention However, in a simple track display, it may be possible to know what the number of images is now, but it is difficult to obtain information on how many more images can be taken. In other words, it may not be known whether there is a recorded track before that track, or whether there is an unrecorded track before that track, and even if the number of tracks is the same depending on the mode as described above. The number of recorded sheets is different, and the number of recordable sheets varies depending on the recording mode and the recording situation, such as the fact that even if there are two tracks, the tracks cannot be used as the frame mode. It causes confusion because it becomes impossible to record in an unexpected place. Therefore, there is a demand for a device that eliminates these problems and surely informs the user of how many more sheets can be taken (and how much can be recorded).

Means for Solving the Problems The present invention has been made in view of the above problems, and a finite number of tracks formed in an annular shape on a magnetic sheet are each independently set as one recording unit. Mode,
A detection unit for detecting the recording state of the track, a mode selection unit for selecting the mode, and a recording state of the track obtained by the detection unit. A magnetic sheet device is provided with calculating means for obtaining the number of remaining recordable units on the magnetic sheet from the mode information obtained by the mode selecting means, and display means for displaying the result.

Effect The present invention, which has the above-described configuration, determines the remaining recordable unit number from the state of the recording track corresponding to each mode having a different recording mode. I can figure it out.

Embodiment Hereinafter, an embodiment in which the magnetic sheet device of the present invention is applied to the electronic still camera will be described with reference to the drawings.
FIG. 1 is a block diagram of the magnetic sheet apparatus, and FIG. 2 shows a sequence of the apparatus.

In FIG. 1, a magnetic sheet 1 is rotated by a motor 2 and recording / reproducing is performed by a head 3. This head 3 is provided with two gaps in the moving direction by one track pitch, and the head 3 is moved without moving the head 3 at the time of frame recording according to the mode set by the mode switch 15. By using the inner gap, two fields constituting one frame are recorded one by one on two adjacent tracks. Also, when recording in the field, always record only in the outer gap. Therefore, the head drive mechanism 4 operates the drive pulse generation circuit 6 in the system control circuit (hereinafter referred to as a syscon circuit) 5 to move the head 3, but the mode switch 15 causes one track and one frame recording in the field recording. At that time, the head 3 is moved by two tracks.

Now, recording / playback by the head 3 is CP in the syscon circuit 5.
It is selected by the changeover switch 8 controlled by U7.
That is, on the recording REC side, the input signal is FM-modulated by the recording signal processing circuit 9 and recorded by the head 3 through the recording amplifier 10. Of course, this operation is controlled by the release (not shown) and the syscon circuit 5. On the reproduction PLAY side, the signal reproduced by the head 3 is sent to the reproduction signal processing circuit 12 through the reproduction amplifier 11 and demodulated and output.
At the same time, the discriminating circuit 13 discriminates the presence or absence of the recording signal, and the result is sent to the syscon circuit 5 and processed in the CPU 7. At the same time, the arithmetic circuit 14 in the syscon circuit 5 calculates the remaining recordable number based on the information from the drive pulse generating circuit 6 and the CPU 7 and outputs it to the display circuit 16 for display. In this state, the head 3 performs recording / reproducing only in one direction.
That is, the recorded track and the unrecorded track do not intersect with each other, and when cueing, the reproduction is started from the first track and the first unrecorded track is found. Indicates that only unrecorded tracks exist.

Now, these processing procedures are as shown in FIG. When the magnetic sheet 1 is mounted in the apparatus, the head 3 has the outer gap at the first track position.

(1) First, reset the counter in CPU7.

(2) Tracks on the outer gap portion of the head 3 (first
Track).

(3) The presence / absence of recording on this track is determined.

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

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

(6) If the counter has not reached 50 yet, send the head 3 one track, and repeat the procedure (2) below.

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

(8) In addition, the remaining number X of frame recordings is set to X = T / 2, and the number of decimals is cut off.

(9) The mode switch 15 discriminates between field recording and frame recording.

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

(11) If T = 0, recording ends and the process ends.

(12) Repeat the following processes (9) until recording is instructed from the release (not shown).

(13) Recording is performed in the outer gap of the head 3.

(14) Add 1 to the counter because it was recorded.

(15) After sending the head 3 one track to the next track, (7) The following processing is repeated.

(16) If frame recording is selected in (9), X is displayed as the remaining number.

(17) Determine whether X = 0.

(18) If X = 0, it is also determined whether T = 0 and T
If is also 0, it means that all the data has been recorded, so the processing ends.

(19) If T ≠ 0, one unrecorded track still remains, so decide whether or not to perform field recording. If it is OK, repeat the procedure from (10). If not OK, end the process.

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

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

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

(23) Feed the head 3 for two tracks, and (7) Repeat the following procedure.

By using the following procedure, the remaining number of possible shots in the selected mode is always displayed, and the electronic still camera that is convenient for the user does not miss a photo opportunity and does not perform double recording. Is obtained.

Now, in this embodiment, the head 3 is supposed to move only in one direction, but it is naturally conceivable that it does not.
Erase functions, jump feed, random recording, etc. are also fully conceivable. In these cases, the above-mentioned configuration alone is not sufficient. For example, when the magnetic sheet 1 is mounted, the recording state is searched over all tracks, and the counter for field recording and the counter for frame recording, that is, 2 are recorded.
A counter for knowing the number of unrecorded tracks in succession may be provided, and the rest may be displayed in the same manner.
At the time of recording, in the case of frame recording, it is necessary to detect that both tracks have not been recorded yet.

In addition, even when it has a mode different from that of the electronic still camera as described above, it can be configured in the same manner by applying the above concept.

EFFECTS OF THE INVENTION As is clear from the above description, the magnetic sheet device adopting the present invention can be surely informed to the user of how much more recording can be done at any time, and is therefore extremely convenient. When applied to electronic still cameras and the like, the effect is extremely great, such as avoiding confusion without losing the photo opportunity.

[Brief description 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. 1 ... Magnetic sheet, 3 ... Head, 4 ... Head drive mechanism, 5 ... Syscon circuit, 13 ... Discrimination circuit, 15 ... Mode switch, 16 ... Display circuit.

Claims (4)

[Claims] 1. A first mode in which a finite number of tracks formed in an annular shape on a magnetic sheet are each independently set as one recording unit, and a plurality of the tracks are collectively set as one recording unit. And a second mode for detecting the recording state of the track, a mode selecting unit for selecting the first and second modes, and a recording state of the track obtained from the detecting unit. And a display unit for displaying the number of remaining recording units that can be recorded on the magnetic sheet based on the mode information obtained from the mode selecting unit. Characteristic magnetic sheet device. 2. When the second mode is selected by the mode selecting means, the detecting means or the calculating means is configured so as to obtain the number of remaining recording units assuming that tracks adjacent to each other are used. The magnetic sheet device according to claim 1. 3. The detecting means is configured to detect the number of recorded tracks by sequentially moving the magnetic head in one direction for recording or reproduction and knowing the moving amount of the magnetic head. The first claim
A magnetic sheet device according to item. 4. A field mode in which a video signal of one field is recorded on one track, and one image is formed in one field to make one recording unit is defined as a first mode, and two adjacent fields are used. 2. A frame mode, which is one recording unit, is set as a second mode by recording one field on each of the two fields constituting one frame on each of the tracks to form one image. The magnetic sheet device according to the first, second or third range of the above.