JPS63133351A - Picture recorder - Google Patents

Abstract

PURPOSE:To prevent a dent from being left onto a recording face by rotating a magnetic sheet normally at the recording and releasing the press contact state between the recording face and a magnetic head at the non-recording state so as to prevent it that the head is brought into contact into the recording face of the sheet at the non-recording state of a long time interval pickup. CONSTITUTION:A control circuit 30 controlling the movement of the magnetic head 36 to a TV camera 10 and a magnetic sheet pack 60 provided to the picture recorder and a decoder 12 decoding an output signal of the camera 10 and supplying the result to the head 36 are provided. A control program controlling each circuit, the control of each device and circuit and the start and end time of interval pickup are set to the circuit 30 by the operation of an operation section 84. Then the magnetic sheet 62 is driven by a servo circuit 50 at the recording to move the head 36 by the control of a moving mechanism 48, and the head 36 is descended by a head driver 88 provided in the pack 60 at the non-recording to release the contact state between the recording face and the head 36.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image recording device for recording still images, and particularly to an image recording device capable of long-time interval photography.

・：Background of the invention】 Recently, it has become possible to electronically record objects by combining imaging devices such as solid-state image sensors and image pickup tubes with recording bags that use magnetic sheets that are inexpensive and have a relatively large storage capacity as recording media. An electronic still camera system has been developed in which still images are taken and recorded on a rotating magnetic sheet, and the images are reproduced using a separate television camera system or printer.

Furthermore, a system has been realized in which a still image recorded on a visible recording medium such as ordinary film or photographic paper is photographed with a television camera and the still image is recorded on a magnetic sheet.

In such a system, recording of a video signal representing an image on a magnetic sheet or reading of a video signal from the magnetic sheet involves applying a magnetic field to the recording surface of the magnetic sheet, which is rotated at a high speed of about 3,600 degrees by a motor. This is done with the heads in close contact. In this case, the magnetic head is projected at a position where the magnetic sheet is partially deformed, and the magnetic sheet is pressed from the back side by a regulation plate provided at a position facing the magnetic head. As a result, a stable contact state between the magnetic head and the magnetic sheet is maintained by the air flow while the magnetic sheet is being rotated at high speed, so that recording and reading of signals can be performed reliably.

However, when the rotation of the magnetic sheet is stopped, the above-mentioned stable contact state cannot be maintained, and the magnetic head and regulating plate press the magnetic sheet, and if this state continues for a long time, dropouts may occur in the magnetic sheet. Leaves no impression. For this reason, if the magnetic sheet is left rotating at high speed for a long period of time in interval photography, which is used for long-term observation of animals and plants, for example, the magnetic head and magnetic sheet will wear out, and the signal will gradually deteriorate. There is a problem that recording cannot be performed normally, and if the rotation of the magnetic sheet is simply stopped during interval photography, impressions will occur.

[Purpose of the invention]

The present invention was made in view of these circumstances, and
In an image recording device that is capable of long-time interval photography, magnetic recording has extremely little wear on the magnetic head and magnetic sheet even when interval photography is performed over a long period of time, and furthermore, recording and reproduction will not become impossible due to indentations. The purpose is to provide a device.

[Summary of the invention]

In order to achieve the above object, the present invention provides an image recording apparatus that records a still image on a magnetic sheet by closely contacting a magnetic head to a recording area of a removable rotating magnetic sheet. recording interval setting means for transporting the sheet in the radial direction and for setting recording to be performed at the predetermined interval;
a first drive means for rotationally driving the magnetic sheet; and a first drive means in which the magnetic head is brought into close contact with a recording area of the magnetic sheet rotationally driven by the drive means and is temporarily in a recordable state.
state holding means for holding the recording area in a second state in which the magnetic head is brought out of close contact with the recording area and is in a non-recording state; (It also has a control means for holding the magnetic sheet and the magnetic head in a first state during recording, and controlling the state holding means to a second state during non-recording set by the recording interval setting means. It is characterized by

〔Example〕

Hereinafter, a preferred embodiment of the magnetic recording device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a magnetic recording device according to the present invention. In the figure, for example, primary color signals R and GS output from a television camera 10, etc.
B and the composite synchronization signal Cs y h c are converted by the decoder 12 into a luminance signal Y+S (where S means both a horizontal synchronization signal and a vertical synchronization signal) and a color difference signal R-YS.
It is converted to B-Y. The color difference signal R-YSB-Y output from the decoder 12 is supplied to the encoder 24 and also to the FM modulator 16 via the analog switch 14.

The analog switch 14 is alternately switched every horizontal scanning period (H) by the switching pulse SP, and creates line-sequential color difference signals based on the color difference signals RY and BY.

Further, the luminance signal Y+S is input to the FMKli device 18, the sync separation circuit 22, and the mixer 26.

The synchronization separation circuit 22 extracts the vertical synchronization signal V s y h e from the composite synchronization signal Cs y , , c, and generates this vertical synchronization signal 11 . is supplied to the control circuit 30 and the servo circuit 50.

The mixer 20 is a circuit that mixes the FM luminance signal output from the FM modulator 16 and the FM line sequential color difference signal output from the FM modulator 18, and synthesizes it into an FM video signal for recording. is the control signal 31 output from the control circuit 30 after being set to a predetermined level by the recording amplifier 32.
A recording/playback switch 34 (
It is supplied to the magnetic head 36 via contact a). An FM video signal for one field is supplied to the magnetic head 36.
This signal is recorded on one track on a magnetic sheet 62, which will be described later.

The FM video signal detected by the magnetic head 36 is output to the reproduction amplifier 37 via the recording/reproduction changeover switch 34 (contact b), and is supplied to the envelope detection circuit g13-9. The envelope detection circuit 39 is a detection circuit that detects the detection output of the magnetic head 36, that is, the envelope of the FM video output recorded on the track of the magnetic sheet 62, and outputs a voltage signal corresponding to the envelope. It is. The voltage signal representing the envelope is converted to an analog/digital converter (Δ
/D converter) into an 8-bit digital signal representing, for example, 256 quantization levels, and then sent to the control circuit 3.
It is set to be input as 0.

The envelope detection signal is used in the control circuit 30 to detect a signal level for determining whether the track to be currently recorded is an unrecorded track and whether or not the FM video signal recorded on the track has been properly recorded. It will be done.

The chroma C from the encoder 24 and the luminance signal Y+S from the decoder 12 are combined into a composite video signal in NTSC format by a mixer 26 and output to a video monitor television 28 .

The television camera 10 is configured to operate in response to a control signal (STAND BY) 11 output for a certain period of time from the control circuit 30, and when not shooting, it stops outputting the control signal 11 and prepares for shooting. This is to prevent wasting power.

The magnetic head 36 is supported by a head transport mechanism 48 as conceptually indicated by a dotted line 49, and is movable in the radial direction along the recording surface 62A of the magnetic sheet 62 of the magnetic seat back 60. Transfer control of the magnetic head 36 is performed based on the home position HP.

FIG. 2 shows tracks formed on the magnetic sheet 62 with a width of about 100 μm and the home position HP of the magnetic head 36 (
(original position or standby position). Fifty tracks are provided concentrically on the magnetic recording surface of the magnetic sheet 62, and tracks Nα from Nα1 to Nα50 are provided in order from the outermost track. Home position HP is N
It is outside the α1 track. This home position H
P is not attached to the magnetic sheet 62, but is an extreme position assigned on the movement path of the magnetic head 36.

This home position HP is detected by a home position switch 65, and its detection output is supplied to the control circuit 30. The movement of the magnetic head 36 from the outside to the inside of the magnetic sheet 62 is forward movement, and the movement in the opposite direction is reverse movement. Control circuit 30
gives instructions to the head transport mechanism 48 regarding the direction and amount of transport of the magnetic heald 36.

The head transfer mechanism 48 is controlled by a control signal 41 output from the control circuit 30. This head transfer mechanism 48
includes a step motor (not shown), and the magnetic head 48 is moved in proportion to the rotation angle of the step motor.

For example, per one drive pulse of the step motor, the step motor rotates approximately 15 degrees, and this causes the magnetic head 36 to move approximately 8.38 μm in the inner diameter direction of the magnetic sheet 62.
m (1 pitch) is transferred. Therefore, the magnetic head 36 is moved very accurately. Further, the magnetic head 36 is controlled by the head transport mechanism 48 to be located at the home position HP in the initial state when the magnetic sheet puff black 0 is loaded into the main body of the apparatus.

The magnetic sheet 62 is connected to the rotating shaft 38 of the spindle motor 38.
It is removably attached to Δ. Since the magnetic sheet 62 is fixed at its center to the rotating shaft 38A of the spindle motor 38 and rotates, the regulating plate 41 that maintains good contact between the magnetic head 36 and the magnetic sheet 62 is attached to the upper lid 83 ( (FIG. 8), and this regulating plate 41 is in contact with the outer peripheral portion of the magnetic sheet 62. As described above, the magnetic head 36 is disposed at a position facing the regulation plate 41 with the magnetic sheet 62 in between, so as to be movable in the radial direction of the magnetic sheet 62, and is in contact with the magnetic recording surface of the magnetic sheet 62.

The spindle motor 38 is driven by a servo circuit 50 activated by a command signal 61 output from the control circuit 30, and receives a frequency signal obtained from a frequency signal generator (FG) 51 and a vertical signal output from a synchronous separation circuit 22. Using the synchronization signals V and YRo, a predetermined speed, in this example 3,600. Rotate steadily with □. Also, the control circuit 30
controls so that a signal is recorded on the magnetic sheet 62 only when the spindle motor 38 reaches a constant rotational speed and enters a servo lock state.

The magnetic sheet pack 60 is loaded into a packet 85 (see the same figure) provided inside the top lid 83 of the device main body, and when loading the magnetic sheet pack 60,
The opening/closing state of the top lid is determined by a load switch 80 provided so as to be in contact with the top lid, and the loading/unloading of the magnetic sheet pack 60 is determined by a back switch 82 provided inside the packet 85.
Each of them is designed to be IINed. The magnetic sheet pack 60 is rotated only when both of these switches 80 and 82 are closed.

The alarm device 29 is a device that issues various warnings to the operator. For example, the number of shots that can be taken N is set in advance.
When the condition is reached, the state is indicated by an acoustic device or an optical display device.

The control circuit 30 is a circuit that unifies and controls the entire device,
A memory that stores programs and data necessary to perform various controls for interval shooting, a frame counter CN that counts the number of frames N that can be shot, and interfaces with peripheral elements, circuits, devices, etc. It is configured. Further, the control circuit 30 is provided with a timer circuit for setting the start and end times of interval shooting. However, the setting of the start and end times of interval shooting is not limited to this, and may be performed on a software program. good.

Further, an operating section 84 is connected to the control circuit 30 for manually inputting instructions from an operator, and the interval time T1, the number of photographable frames N, etc. are set via the keys of this operating section 84.

FIG. 3 shows a plan view of the magnetic sheet pack 60, and FIG. 4 shows a sectional view taken along the line ■-■ in FIG. East 3
As shown in the figure, the magnetic sheet pack 60 has a substantially rectangular shape, and a magnetic sheet 62 on which still image information and the like are recorded is rotatably housed inside. A center core 66 as a reinforcing member is provided in the center of the magnetic sheet 62, and the center core 66 is exposed to the outside through a circular opening 72 of the magnetic sheet pack 60. A window 74 in which the magnetic head 36 and regulating plate 41 are located is opened in the magnetic seat back 60, and this window 74 is opened and closed by a slideable shutter 76. That is, the shutter 76
Before the magnetic sheet back 60 is inserted into the packet 85, the window 76 is closed to prevent dust from adhering to the magnetic sheet 62, and when the magnetic sheet back 60 is inserted into the packet 85, the shutter 7 is closed.
6 moves downward in FIG. 3 to open the window 74, allowing recording on the magnetic sheet 62. A locking recess 78 is formed at the opposite end of the shutter 76 in the magnetic seat back 60, and this recess 78 is used for the inner packet 8.
It is used for temporarily fixing the magnetic seat back 60 when it is inserted into the magnetic seat back 60.

Next, a processing routine for interval photography executed by the control circuit 30 will be described with reference to FIG.

After the entire device is powered on and the load switch 80 and back switch 82 detect that the magnetic seat back 60 has been properly loaded into the packet 85, execution of the program is started. First, in step 100, the operator sets the number of photographable frames N and the interval time T using the keys on the operation section 84. As a result, respective instruction values (N, T) are set in the frame counter CN and the timer circuit in the control circuit 30, and step 10
Proceed to step 2. In step 102, the control signal 11 is output from the control circuit 30 to the television camera 10, and the control signal 11 is outputted from the control circuit 30 to the television camera 10.
starts photographing from the moment it receives this control signal 11.

Next, in step 104, the servo circuit 50 is transferred from the control circuit 30 to the servo circuit 50.
A command signal 61 for starting the spindle motor 38 is output, and the servo circuit 50 receives this command signal 61 and starts controlling the spindle motor 38 to reach a constant rotation speed.

In step 106, the head transfer mechanism 48 is transferred from the control circuit 30 to the head transfer mechanism 48.
Then, a control signal 41 for moving the magnetic head 36 to the first unrecorded track on the magnetic sheet 62 is output, and the step motor of the head transport mechanism 48 moves the magnetic head 36 to the unrecorded track. Ru. After the process in step 106 is completed, the process proceeds to step 108, and in step 108 it is determined whether the spindle motor 38 has reached a constant rotation speed (3,60 rpm>) and entered the servo lock state.Step 108
If it is determined that the servo lock state has not been entered, the process proceeds to step 124. - If it is determined that the state has entered the rutted state, the process proceeds to step 110, and in step 110, an FM video signal corresponding to one frame of the subject image obtained by the television camera 10 is sent to the recording track via the magnetic head 36. recorded. After the process in step 112 is completed, the process proceeds to step 112, and step 1
At step 12, the control circuit 30 outputs a control signal 31 that causes the recording/reproduction switch 34 to switch from contact a to the contact side in order to check whether the FM video signal is normally recorded at a predetermined level. As a result, the magnetic head 36
The FM video signal reproduced by is detected by an envelope detection circuit 39. The control circuit 30 takes in the output signal from the envelope detection circuit 39, and if the output signal is at a predetermined level, determines that the imaging has been performed normally, and proceeds to step 114.

Separately, if it is determined in step 112 that the photographing is not performed normally, the process proceeds to step 124. In step 124, a warning signal is output from the control circuit 30 to the alarm device 29, indicating that the photographing is not being performed normally.
As a result, the alarm device 29 issues a warning to the operator. That is, in the process of step 124, the process of step 10 described above is performed.
If the spindle motor 38 does not enter the servo lock state at step 8 or if photographing is not performed normally, a warning will be issued to the operator.

After the process in step 124 is completed, the process proceeds to step 126, where it is determined whether or not the operator has taken out the magnetic seat back 60 from the packet 85 in response to a warning from the alarm device 29. If it is determined in step 126 that the magnetic seat back 60 has not been taken out yet, the process returns to step 124 and the same process is repeated. That is, a warning is issued while the back switch 82 is in the ○N state in step 126, and when the back switch 82 is in the OFF state, the warning is issued in step 12.
The warning is canceled at 8. After the warning is canceled in step 128, the process moves to another processing routine.

In step 114, it is determined whether or not the count value C of the frame counter CN has reached the number of recordable frames N, and if it is determined that the count value C has not yet reached the number of recordable frames N; , proceed to step 116. In step 116, a control signal 41 is outputted from the control circuit 30 to the head transfer mechanism 48 for moving the magnetic head 36 onto a track other than the recording tracks (Nα1 to Nα50), for example, track Nα0, which is a virtual track on the home position side. be done. As a result, the head transfer mechanism 48 receives this control signal 41.
In response, a magnetic helad 36 is placed on the track Nα0.
is controlled to move by a predetermined distance (Fig. 6). Step 11
After the processing in step 6 is completed, the process proceeds to step 118, and in step 118, a control signal 61 is outputted from the control circuit 30 to the servo circuit 50 to gradually lower the rotation speed of the spindle motor 38 to a predetermined low speed rotation. Ru. The servo circuit 50 receives this control signal 61 and controls the spindle motor 38.
Control is performed such that the drive voltage supplied to the spindle motor 38 is gradually lowered to rotate the spindle motor 38 at a low speed.

In the process of steps 116 and 118, after the magnetic head 36 was transferred to the track Nα0, the rotation speed of the spindle motor 38 was controlled to be lowered.
For example, as shown in FIG. 7, a regulating plate driving device 86 for raising and lowering the regulating plate 41 on the back surface of the magnetic sheet 62 is provided, and this regulating plate driving device! Control circuit 3 for t86
0 to raise the regulation plate 41 during non-recording,
It may be configured to be lowered during recording. Further, as shown in FIG. 8, the magnetic head 36 is connected to the recording surface 6 of the magnetic sheet 62.
A head drive device 88 for raising and lowering the head on 2A is provided,
The head driving device 88 may be controlled by the control circuit 30 to raise the magnetic head 36 relative to the recording surface 62A during non-recording and to lower it during recording.

Further, as shown in FIG. 9, the top cover 83 may be opened by a spring 90 when not recording, and closed by a plunger 92 during recording. As a result, the magnetic sheet pack 60 housed in the packet 85 is separated from the magnetic head 30 during non-recording, and the magnetic head 30 is brought into close contact with the recording surface 62A of the magnetic sheet 62 during recording. Further, the plunger 92 is driven by a packet opening/closing drive circuit 94 which is controlled by the control circuit 30.

The main driving portions of the regulating plate driving device 86 and head driving device 88 shown in FIGS. 7 and 8 are constituted by, for example, the plunger 92 shown in FIG.

Next, in step 120, from the control circuit 30 to the television camera 1
The output of the control signal 11 that has been output to 0 is stopped, and thereby the television camera 10 returns to the shooting preparation state, and the process proceeds to step 122. In step 122, it is determined whether the time t measured by the timer circuit has reached the interval setting time T.

If the interval set time T has not been reached in step 122, the same process is repeated until the time t measured by the timer circuit reaches the interval set time T. Steps apart from this! If the measured time t of the timer circuit reaches the interval setting time T in step 22, step 10
2, and the above-described process for interval photography is repeated again.

As described above, in this embodiment, during interval photography, the magnetic sheet is rotated at a steady high speed during recording, and then the magnetic head is moved onto the recording track, and after photography is completed, the magnetic head is moved again to a position other than the recording track. Since the magnetic sheet is transferred to the area and the rotational speed of the spindle motor is gradually lowered to rotate the magnetic sheet at a low speed, wear of the magnetic head and the magnetic sheet is reduced. Furthermore, there is no impression left when the rotation of the magnetic sheet is simply stopped.

In addition, since the magnetic head is controlled to move to an area other than the recording track when not recording, even if the rotation of the magnetic sheet is stopped after shooting, the recording track surface will not be damaged by the markings of the magnetic head. It never occurs.

〔Effect of the invention〕

As explained above, in the image recording apparatus of the present invention, the magnetic sheet is constantly rotated during recording, and the contact state between the recording surface of the magnetic sheet and the magnetic head is released during non-recording, so long interval shooting is possible. When not recording, the magnetic head does not contact or strongly contact the recording surface of the magnetic sheet, reducing wear on the magnetic head and the magnetic sheet, and the magnetic head does not leave impressions on the recording surface. No dropouts occur.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of an image recording device according to the present invention, FIG. 2 is a diagram showing track distribution of magnetic sheets and the position of the home position, FIG. 3 is a plan view of a magnetic seat back, FIG. 4 is a sectional view taken along the line ■-V in FIG. 3. FIG. 5 is a flowchart showing a processing routine for interval photography executed by the control circuit. FIG. 6 is an explanatory diagram of head transfer. FIG. 8 is an explanatory diagram of the raising and lowering operation of the regulating plate, FIG. 8 is an explanatory diagram of the raising and lowering operation of the magnetic head, and FIG. 9 is an explanatory diagram of the opening and closing operation of the packet. 10... TV camera, 30... Control circuit,
36...I air field, 38...Spindle motor, 41...Adjustment plate, 48...Head transport mechanism, 50...Servo circuit, 60...Magnetic sheet pack, 83...Top lid , 85...packet, 90...spring, 92...plunger.

Claims (6)

[Claims] (1) In an image recording device that records a still image on the magnetic sheet by placing a magnetic head in close contact with the recording area of a removable rotating magnetic sheet, the magnetic head is moved in the radial direction of the magnetic sheet at predetermined intervals, and , a recording interval setting means for setting recording to be performed at the predetermined interval; a driving means for rotationally driving the magnetic sheet; and a recording area of the magnetic sheet rotationally driven by the driving means. The first one, where the head is in close contact and ready for recording.
state holding means for holding the magnetic head in a second state in which the magnetic head is brought out of close contact with the recording area and becomes in a non-recordable state; It is characterized by comprising a control means for holding the magnetic sheet and the magnetic head in a first state during recording and controlling the state holding means to a second state during non-recording set by the recording interval setting means. Image recording device. (2) The control means controls the state holding means so as to move the magnetic head out of the recording area of the magnetic sheet during non-recording.
). (3) The control means controls the state holding means so as to move the magnetic head out of the recording area of the magnetic sheet during non-recording.
The image recording device described. (4) The image recording apparatus according to claim (1), wherein the control means controls the state holding means so as to separate the magnetic head from the recording surface of the magnetic sheet during non-recording. . (5) The state holding means includes a regulating plate that is movable up and down in order to bring the recording surface of the magnetic sheet and the magnetic head into close contact, and the control means controls the regulating plate of the state holding means when not recording. The image recording apparatus according to claim 1, wherein the image recording apparatus is controlled to be raised above the sheet surface. (6) The control means controls the drive means to rotate the magnetic sheet at a low speed during non-recording. Image recording device.