JPH0353682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording method for a magnetic camera that uses a magnetic medium as a recording medium, and in particular to a magnetic camera that allows images that have been recorded to be selectively erased and re-recorded. Regarding the recording method.

For example, in a magnetic camera that uses a re-recordable magnetic disk or magnetic drum, in order to re-record, it is necessary to know which tracks can be re-recorded or newly recorded, and various methods have been considered to date. However, each has its drawbacks as described below.

(i) For example, there is a method of putting a disk in a case and attaching a mechanical rotary counter/indicator to the case to know which tracks are unused.
However, this method has disadvantages, such as not being able to accommodate inter-truck use, making the case complicated and expensive, and exposing the counter, which makes the display easy to change due to inadvertent contact. Another possible method is (ii) providing a semiconductor memory in the case containing the magnetic recording medium and storing used track numbers therein. Although this method can accommodate inter-truck use, it still has the disadvantage of making the case more complex and expensive. Furthermore, (iii) the case containing the magnetic recording medium is
Equipped with Kuromitsuku Display (ECD),
There is a method that takes advantage of the memorability of the ECD by displaying the number of used tracks. However, this method also cannot support interlaced use, and there are also technical problems such as the ECD's storage time is not infinite.

(iv) As in (i) to (iii) above, when recording images without providing a memory element on the disk case, it is possible to search the tracks one after another and find an empty track, but It has the disadvantage of prolonging the time. That is, when moving to the next photograph, time is required to search for an empty track, and it is not possible to immediately proceed to the next photograph.

The above also applies to drums.

The present invention was invented in view of this situation, and it does not require adding anything to the disk case or drum, does not extend the repeat shooting time, and furthermore, it is possible to use the image signal of the track once recorded. The present invention provides a magnetic camera recording method that enables repeated use of disks and drums by selectively erasing and re-recording information.

That is, in the magnetic disk magnetic drum recording method according to the present invention, a magnetic disk or a magnetic drum has an image recording area for recording an image and a track usage status for recording the track usage status of the image recording area. When a magnetic disk or magnetic drum is loaded into a magnetic camera, the signal recorded in the track usage state recording area is first read out and stored in a storage device provided in the magnetic camera, and then Each time a photograph is taken or erased, the contents of the storage device are changed accordingly, and when the magnetic disk or magnetic drum is taken out from the magnetic camera, the stored contents of the storage device are changed to the contents of the magnetic disk or magnetic drum. It is characterized in that it can be taken out after being stored in the track usage state recording area.

The method according to the present invention will be explained in detail below based on a magnetic disk camera in which the method was implemented.

1 and 2 are external views of the magnetic disk camera, with FIG. 1 being a view seen from the upper right front, and FIG. 2 being a view seen from the lower left rear. This magnetic disk camera has a form similar to a conventional camera using silver halide photographic film, and also
The operations have been devised so that they can be performed in almost the same way.

In addition, in the same figure, the part names of each code are as follows.

1: Camera body, 2: Strobe/Hot/
Shutter, 3; Self-shutter LED, 4; Self-shutter, 5; Shutter release button, 6;
Shutter lock, 7; Photographic lens, 8; Auto/
Manual switching and shutter speed setting knob,
9; Head shift forward button, 10; Head shift reverse button, 11; Erase button, 12; Door switch, 13; Door switch lock, 14; Closed hood, 15; Ready LED,
16; Disk insertion slot door; 17; Battery box and power switch.

First, an overview of the magnetic disk camera will be explained. A real image generated by the photographing lens 7 is converted into a video signal by an image sensor made of semiconductor, which is appropriately processed and recorded on a magnetic disk. When shooting, this camera requires functions such as rotating the disk at high speed and stability and moving the magnetic head over the track to be recorded. A microcomputer is built into the camera, and the sequence is managed based on a predetermined program. Since the sequence is managed in this manner, malfunctions of the camera due to operational errors are prevented, and the user can safely concentrate on taking photographs.

When the user inserts the battery into the battery box, closes the lid 17 of the battery box, and sets it to the ON position,
The control system is powered on and ready for operation. Then, by pressing the door switch 12, loading the disk, capturing the subject in the viewfinder, and pressing the shutter release button 5, the user can take a picture.

FIG. 3 shows an example of the display that appears in the finder. At the bottom of the screen, a list of used tracks of the disks currently loaded in the body and the location of the heads are displayed. That is, the display 18 located below the track numbers (image recording tracks) 1 to 50 is a display that displays the used track number, and the display 19 located above is a display that displays the head position. It is. C indicates a control track, and W indicates a cleaning track. Other displays are the same as those of a conventional normal camera, 20; matte surface, 21; split image, 22; speed light ready indicator, 2
3; Aperture value display, 24; Auto/Manual
Shutter speed indicator, 25; auto/manual shutter speed indicator; 26; shutter speed indicator.

Next, the configuration and operation of the magnetic disk camera will be summarized based on FIGS. 4 to 8 A, B, and C.
The explanation will focus on the relationship with the present invention.

FIG. 4 is a block circuit diagram of the camera, showing the shutter release button 5, photographing lens 7, head shift/forward switch (button) 9, and head shift/reverse switch (button) shown in FIGS. 1 to 3. )10, door switch 12,
Ready LED 15 and finder display section 18
-26 In addition, it is composed of the following components.

That is, the half mirror 26, the sensor 27, the sensor driver 28, the recording signal processing circuit 29, the changeover switch 30, the recording amplifier 31, the reproduction amplifier 31a,
Erase amplifier 31b, selector switch 32, head 3
3.Finder eyepiece 31, half mirror 3
2, encoder 34, decoder 35, RAM3
6, ROM 37, and CPU 38.

FIG. 5 is an explanatory diagram of the mechanism around the disk of the camera, including the disk 39 and the disk case 4.
0, disk clamp mechanism 41, head drive mechanism 42, disk case shutter 43, disk presence/absence detection and disk release mechanism 44, disk case/shutter switch 45, disk rotation motor 46, pulse generator 47, door 48 and door It is composed of a switch 49.

FIG. 6 is an explanatory diagram of the arrangement of tracks on the disk, in order from the outer circumference: an image recording area 50, a margin (guard band) 51, a used track number recording track 52, and a cleaning track 53.
are arranged concentrically.

FIG. 7 is an explanatory diagram of the format of the used track number recording track 52, which is composed of a track head mark H, data (track number), a boundary mark B, and a track end mark T.

In FIG. 4, the light beam incident from the photographing lens 7 passes through the half mirror 26, and then passes through the sensor 27.
image is formed. A signal from the shutter release button 5 operates the sensor driver 28 to obtain a video signal, which passes through the recording processing circuit 29, the changeover switch 30, the recording amplifier 31, and the changeover switch 32, and then excites the head 33. At this time, the head 33 is moved by the head drive mechanism 42 so as to contact a suitable track in the image recording area 50 (FIG. 6) of the disk. Further, the disk 39 is connected to a motor 46 by a disk clamp mechanism 41, and has a rotation speed of 3600 (rpm) or 1800 (rpm).
Rotates stably at high speed. When the photographing is completed, the rotation of the disk 39 is stopped. The disk 39 is inserted or removed by pressing the door switch 12 and opening/closing the door 48.

Next, the operation of loading and unloading the disk of the camera will be explained according to the flowchart of the sequence of loading and unloading the disk shown in FIGS. 8A to 8C.

When door switch 12 is pressed, disk 3
9 is not loaded at all, the path branches to a route without a disk and the door 48 is opened. here,
The disk 39 is loaded by the user. When the door 48 is closed, the disk 39 is clamped by the disk clamp mechanism 41, the disk case shutter 43 is opened by its opener 45, and the disk 39 is rotated. After cleaning the head 33 using a cleaning track 53 (see FIG. 6) formed on the disk 39, the head 33 is brought to the used track number recording head 52 and traced. The signal induced in the head 33 is supplied to the reproduction amplifier 31a via the changeover switch 32, and is amplified there. The output is decoded by a decoder 35, and the used track number is reproduced and stored in a built-in memory (semiconductor RAM) 36. Based on this content, the head 33 is moved to the unused track with the lowest number, and the display unit is activated to display the used track number display 18 in the finder.
By lighting up the head position indicator 19, the used truck number and head position will be displayed.
Turn on LED15. At this point, we were ready to take pictures.

Here, if the shutter release button 5 is pressed, the process branches to the photographing routine; otherwise, the rotation of the disk 39 is stopped, and the disk loading sequence is completed.

After that, you can take pictures at any time. and,
If the recorded track number on the disk changes due to photographing or erasing, the contents of the built-in memory 36 are updated accordingly. By doing this, the correct recorded track number is always recorded in the built-in memory 36.

Next, the case of taking out the disk will be explained. When the door switch 12 is turned on, the presence or absence of the disk 39 is inspected by the disk presence/absence detection and disk release mechanism 44. (8th
(See the top of Figure A) Here, if the disk 39 is loaded, it branches to the path with the disk,
Turn off READYLED15 and read the recorded track number stored in built-in memory RAM36 from disk 3.
Used truck number recording track 5 provided at 9
2 (see Figure 6). An example of the format is shown in FIG. In this recording format, one recording section is an arc looking at a central angle of 6 degrees. It is formed based on the output of a pulse generator 47 which generates 60 pulses per rotation of the disk 39. The recorded data is 6 bits, serial 2
This is the used track number displayed in digits. In this writing, a track head mark H is recorded before the first data, a boundary mark B is recorded between the data D, and a track end mark T is recorded after the last data D. This recording signal is generated by the CPU 38 using the ROM 37 and the encoder 34, and sent via the changeover switch 30 to the recording path already mentioned (recording amplifier 31→changeover switch 32→head 33). After recording the taken track number on the disk 39 in this way,
The head 10 is evacuated, the disk case shutter 43 is closed by the disk case shutter opener 45, and the door 48 is opened by the door opener 49 to put the disk in a released state. Here, disk 3
By taking out 9 and closing door 48,
The disk eject sequence is completed.

In the block diagram shown in FIG. 4, only one head is provided, but a separate head exclusively for erasing may be provided. In this case, the image will be erased exclusively by the reproduction device. As a result, the design and arrangement of the erasing head to be provided can be optimized so that only used track number recording tracks can be efficiently erased.

Furthermore, data such as the azimuth type, photographing date, exposure conditions, etc. of the recording signal of each track may be recorded in the used track number recording tracks of FIGS. 6 and 7.

Although a magnetic camera using a magnetic disk as a magnetic recording medium has been described above, it goes without saying that the present invention can be similarly applied to a magnetic camera using a magnetic drum.

As is clear from the above description, according to the method according to the present invention, a magnetic disk or a magnetic drum is provided with an image recording area and a track usage state recording area, and when the magnetic disk or magnetic drum is loaded into a camera, the track usage state is recorded. The usage status is read and stored in the camera's built-in RAM, and the memory in the RAM is updated each time a photo is taken or erased.When the magnetic disk or magnetic drum is removed from the camera, the RAM is
Since the memory content is recorded in the track usage state recording area of the magnetic disk or magnetic drum, it is possible to record it once more without installing a new element on the disk case or magnetic drum, and without prolonging the repeat shooting time. By selectively erasing the image signals of the recorded tracks and re-recording them, the disk or drum can be used repeatedly. Since the used track number is updated in the built-in memory, there is no need to bring the head into contact with the disk or drum each time an update is made, which reduces wear on both.

[Brief explanation of drawings]

FIG. 1 is an overview view of a magnetic disk camera seen from the upper right front in which the method according to the present invention is implemented, FIG. 2 is an overview view of the magnetic disk camera viewed from the lower left rear, and FIG. 4 is a block circuit diagram of the magnetic disk camera, FIG. 5 is an explanatory diagram of the mechanism around the disk of the magnetic disk camera, FIG. 6 is an explanatory diagram of the arrangement of tracks on the disk, and FIG. FIG. 7 is an explanatory diagram of the format of the used track number recording track, and FIGS. 8A, B, and C are flowcharts of the sequence of loading and unloading the magnetic disk in the magnetic disk camera.

Claims (1)

[Claims] 1. In a recording method for a magnetic camera using a magnetic recording medium as a recording medium, the magnetic recording medium records an image recording area for recording an image and a track usage state of the image recording area. and a track usage state recording medium for recording, when the magnetic recording medium is loaded into the magnetic camera,
First, the signal recorded in the track usage state recording area is read out and stored in a storage device provided in the magnetic camera, and when the signal is photographed or erased, the stored contents of the storage device are changed accordingly, and the signal recorded in the magnetic camera is A recording method for a magnetic camera, characterized in that when the magnetic recording medium is taken out from the camera, the storage contents of the storage device are stored in a track usage state recording area of the magnetic recording medium, and then the magnetic recording medium can be taken out.