JPS62273659A - Discriminator - Google Patents

Abstract

PURPOSE:To discriminate recording/unrecording in a short time by detecting a signal level of a track sequentially and discriminating it as the presence of recording before a signal level over all range of tracks is detected when the level reaches a prescribed reference value. CONSTITUTION:A recording presence detection circuit 85 is constituted to detect the presence of an RF signal when a recording signal is, e.g., an RM signal, and outputs a high level signal when the recording exists. A system controller 91 uses the circuit 85 so as to sample the RF detection output level in the timing of FG for the signal, e.g., on a track. When the RF detection output level detected sequentially along the track reaches a prescribed reference value, before the signal level over the entire range of the track is detected, it is discriminated to have recording at the track position. Thus, the recording/ unrecording is discriminated in a short time.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention moves a recording head in a predetermined direction with respect to a record carrier, and performs recording at each moving position. The present invention relates to a determination device that determines the presence or absence of recording on a track in a recording device or the like.

[Conventional technology]

For example, a rotary record carrier such as a magnetic disk or a magnetic drum is used, and concentric or annular recording tracks are formed by a movable head, and each track records unit length information (for example, one field or one frame). In a recording device that records video signals, etc.), if you want to record information while preventing double recording, the head must be correctly positioned on the unrecorded part of the record carrier before recording. Is required.

Conventionally, prior to recording, the presence or absence of recording that can be placed at the recording position on the record carrier is detected, and if there is recording, the head is moved to the next recording position, by repeating the following operations. Head positioning methods are already known in which the head is positioned on an unrecorded portion of the record carrier. (For example, Japanese Patent Application Laid-Open No. 54-1405 related to the present applicant)
It is disclosed in Publication No. 15. ) [Problems to be solved by the invention] By the way, according to the head positioning method as described above,
If an intermediate recording track on the record carrier has been erased, the head will first be positioned to this erased track, and therefore, after recording at this position, the head will be moved to the next one. Even when moving the head to a recording position, it is necessary to determine whether recording is being performed at each moving position of the head. That is, otherwise it would be impossible to prevent double recording. In this case, since the head is moved to a non-recording position, it takes time until the next recording is possible, and a recording opportunity (that is, a so-called shutter chance in a camera) is lost. Alternatively, continuous recording (eg, continuous still video recording of several fields or frames per second) cannot be performed properly.

[Means for solving problems]

The present invention sequentially detects the signal level of a track along the track in a discriminating device. The apparatus includes a detecting means and a discriminating means for discriminating that no recording has been made at the track position before detecting the signal level over the entire range of the track when the detection result of the detecting means reaches a predetermined standard.

[For production]

The detecting means sequentially detects the signal level on the track, and the determining means detects the entire track if a signal of a predetermined level or higher is detected in multiple parts or the sum of the signal levels of the plural parts reaches a predetermined level. Since it is determined that this track is a recorded track before detecting the recorded track, the determination can be made in a short time.

〔Example〕

First, a record carrier used in an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, l indicates a cassette as a record carrier holder, and a flexible rotating magnetic disk 2 as a record carrier is housed inside the cassette.

A center core 3 is provided at the center of the magnetic disk 2 as a mounting portion made of synthetic resin, etc., and a magnetic plate 3d (shown in 3B and 3C) is fixed to the lower surface of the center core 3. Moreover, a magnetic pin 3e for indicating the rotational phase is implanted in this magnetic plate 3d so as to penetrate through the center core 3. The cassette 1 is provided with upper and lower openings 1a and ib into which stabilizers 37 and 15 (FIG. 2) for stabilizing the rotation of the magnetic disk 2 can enter, respectively. Then, the recording magnetic head 5 comes into contact with or closely opposes the recording surface of the magnetic disk 2 through the lower surface side opening 1b.

The center core 3 is attached to the magnetic disk rotation drive spindle 6 on the loading side, and an engagement hole 3c is provided for this purpose.
The engagement hole 3c has two slope parts 3b and a spring part 3.
a, and is attached to the spindle 6 by a spring portion 3a so that the slope portion 3b of the center core 3 is in contact with the spindle 6. Furthermore, the flange portion 6a of the spindle 6 is
is provided with a permanent magnet 7, and when the center core 3 is attached to the spindle 6, its magnetic plate 3d is attracted by the permanent magnet 7 on the spindle 6 side and becomes a so-called magnet.
Chucking is performed, and at this time, the lower surface of the center core 3 comes into contact with the flange surface 6b of the flange portion 6a of the spindle 6, thereby defining the height of the magnetic disk 2 relative to the head 5.

Note that 1c and 1d are openings on the upper and lower surfaces of the cassette l corresponding to the center core 3.

Next, an embodiment of the present invention using the magnetic disk cassette described above will be described below.

First, referring to FIG. 2, reference numeral 11 indicates a main body chassis of the recording apparatus, and the above-mentioned spindle 6 and head 5 are rotatably and movably provided on the main body chassis 11. ing.

Further, the main body chassis 11 is provided with a hinge shaft 12 . Reference numeral 16 denotes a side plate provided on the main body chassis 11. A shaft 17 is mounted on the side plate 16, and a tension lever 18 is applied to the shaft 17 with a force applied clockwise by a spring 19. It is rotatably provided. Furthermore, a pair of pins 20 are planted on the same side plate 16, and two lock levers 21 are slidable while being guided by the pins 20. 23 are springs 22. 24, it is energized and provided on the left side in the figure. Note that the springs 22 and 24 are hooked by pins 41 and 42, which are implanted in the side plate 16.

Reference numeral 31 designates a cassette holder as a cassette receiving member, and the holder 31 is rotatably attached to the main body chassis 11 around the aforementioned hinge shaft 12 through its hinge portion 31e. The holder 31 has an opening 31f at one end for receiving the aforementioned cassette l, and the cassette 1 is inserted through the opening 31f.
is inserted. Opening 3 provided in holder 31
1a and 31b are for allowing entry of stabilizing plates 37 and 15, which will be described later, respectively, and openings 31c and 3
1d is for allowing the entry of the spindle 6 and a protrusion 38a of a center core pressing leaf spring 38, which will be described later.

The opening 31g provided on the lower surface side is the main body chassis 11.
This is to allow a cassette sensing piece 6'6a of a later-described cassette loading/unloading detection lever 66 (FIG. 5), which is provided to protrude through the hole 11b, to enter.

35 is an outer housing member, that is, an outer cover, and the outer cover 3
5 is rotatably attached to the main body chassis 11 by its hinge portion 35a about the aforementioned hinge shaft 12. Lock pins 36a and 36b are implanted on the front end side surface 35c of the outer cover 35, and a hook member 40 for connecting to the holder 31 is provided. 3
Reference numeral 7 denotes an upper stabilizing plate attached to the ceiling of the outer cover 35, and the magnetic disk 2 is rotated by sandwiching the magnetic disk 2 from above and below, respectively, together with the lower stabilizing plate 15 provided on the main body chassis ll side. Prevents vibration and deformation. In this case, each stabilizer plate 37. 15 and the magnetic disk 2, their positions are set so that an appropriate air layer is formed between them. Note that the head 5 protrudes through an opening 15a provided at the center of the lower stabilizing plate 15.

Reference numeral 38 denotes a T-shaped leaf spring, which is an example of center core pressing means, whose tail end 38b is fixed to the ceiling of the outer cover 35 by means such as screws, and a portion 38a of its tip is fixed downward as shown in the figure. The ears 38c on both sides are formed so as to protrude from the
are respectively fixed by position regulating members 39 glued to the ceiling of the outer cover 35 against the elasticity of the leaf springs 38, so that the protrusions 38a move to the upper part of the spindle 6 when an initial force is applied thereto. It is arranged so that it comes to

The spring 13 disposed on the hinge shaft 12 has its arms applied to the holder 31 and the outer cover 35, respectively.
A rotational force in the opening direction is applied between the two.

The spring 14 has one arm pressed against the main body chassis 11 and the other arm pressed against the outer cover 35, thereby imparting a counterclockwise rotational force to the outer cover 35.

74 is provided on the main body chassis 11 and is connected to the lock lever 2.
The contact piece 74a is pressed by the switch control arm 23d of No. 3, and the contact piece 74a is in the state shown in FIGS.
and 74b are in contact with each other.
This is a lock completion detection switch.

Here, with reference to FIG. 5, the structure of the storage means for mechanically storing that the cassette 1 has been replaced (installed and removed) will be explained.

In the figure, 61 is a lever pivot shaft member fixed to the back surface of the top plate of the main body chassis 11, and 62 is a switch rotatably and swingably supported by the shaft portion 61a of the pivot member 61. The operating lever has a switch operating portion 62a at its tip that is bent so as to be located above the contact piece 70a of the switch 70 in a neutral state. A spring 63 biases the lever 62 counterclockwise in the figure and maintains it in a neutral state, and is wound around the shaft portion 61a of the pivot member 61, and its both ends are connected to the lever 62 and the fixing pin 65, respectively. It is hung. By receiving the tail end 62b of the lever 62, the pin 65 rotates counterclockwise to the switch operating portion 62a.
is arranged so that it can be regulated at a position just above the contact piece 70a of the switch 70. Reference numeral 64 denotes a member that prevents the spring 63 and the lever 61 from being removed.

Reference numeral 66 denotes a substantially L-shaped cassette loading/unloading detection lever with a cassette sensing piece 66a at its tip, which is rotatably supported by a shaft 67, and is rotated counterclockwise in the figure by a spring 68, i.e. The cassette sensing piece 66a is biased to protrude toward the holder 31 through the hole 11b (on the top plate) of the main body chassis 11, and further receives the arm 62c of the switch operating lever 62 against the spring 63. a falling portion 66b and a pressing portion 66c for pressing down the arm portion 62c.
and a switch operating section 66d for pressing down the contact piece 69a of the switch 69.

Reference numeral 69 denotes a normally closed type cassette presence/absence detection switch, and when the cassette l is not loaded, the cassette loading/unloading detection lever 66 is rotated counterclockwise by the spring 68, so that its switch operation portion 66d is turned on and off. Piece 69a
is turned off by being pushed down and separated from the contact piece 69b, and when the cassette l is loaded, the lever 66 moves from the sensing piece 66a as shown in FIGS. 3B and 3C.
When the contact pieces 69a and 69b are pushed by the lower surface of the cassette 1 and rotated clockwise, the contact pieces 69a and 69b come into contact with each other due to their sliding properties and are turned on.

70 is a switch operation part 62a of the switch operation lever 62
This is a normally open type cassette loading/unloading detection switch which is turned on when the contact piece 70a is pressed down and comes into contact with the contact piece 70b.

A gear 71 is rotatably supported by a shaft 72, and is rotated in conjunction with the movement of the head 5 by a head moving mechanism to be described later. 73 is a reset unit integrated with gear 71.
When the head 5 is moved by the head moving mechanism to a predetermined position outside a predetermined recording area on the magnetic disk 2, the lever presses the tail end 62b of the switch operation lever 62 with its rising portion 73a. By rotating the arm 62c clockwise against the spring 63, the arm 62c is detached from the push-down part 66c of the cassette loading/unloading detection lever 66.

Now, in the above configuration, first, in order to load the cassette L, the outer cover 35 is attached to the main body chassis 1 as shown in FIG. 3A.
1, it is rotated counterclockwise about the hinge shaft 12 by the biasing force of the spring 14 to open it, and one end 35b of the main body is brought into contact with the chassis wall 11a and stopped. In this case, the force of the spring 13 causes the holder 31 to
attempts to rotate clockwise relative to the outer cover 35, but is restrained in the position shown in FIG. 3A by the hook member 40 provided on the outer cover 35.

Here, when the outer cover 35 and the holder 31 are opened as shown in FIG. 3A, the tension lever 1 is opened as shown in FIG. 4A.
8 hook part 18b and lock lever 21 claw part 21
d are in an engaged state. Also, the bent portion 21c of the lock lever 21 and the one end 23c of the lock lever 23
Therefore, both ends of the lever 21.23
are respectively springs 22. It is in a locked state at a position shifted to the right against 24.

Also, double-ended lever 21. The claw portions 21a and 23a and 21b and 23b provided on the outer cover 35 are located outside the locus of movement of the lock pins 36a and 36b implanted in the outer cover 35. In this state, the contact pieces 74a and 74b of the lock completion detection switch 74 are in a non-contact state.

In addition, in this state, as shown in FIG. 5, the cassette loading/unloading detection lever 66 is rotated counterclockwise by the spring 68, so the switch operation lever 62 is moved by the falling portion 66b of the detection lever 66. Unregulated spring 63
The switch operating portion 62a is positioned directly above the contact piece 70a of the cassette loading/unloading detection switch 70. is in a state of Further, the cassette presence/absence detection switch 69 is connected to the switch operating portion 6 of the detection lever 66.
The contact piece 69a is pushed down by the contact piece 6d.
and 69b are in a non-contact state.

Returning again to FIG. 3A, insert the cassette l through the opening 31f of the holder 31 in the state shown, and rotate the outer cover 35 clockwise about the hinge shaft 12 against the biasing force of the spring 14. Then, the holder 31 also rotates in the same direction around the hinge shaft 12, and at the position corresponding to the cassette loading and disk loading completion position shown in FIG. - It enters the engagement hole 3C of the core 3, and the lower stabilizer plate 15 and the upper stabilizer plate 37 also enter the opening 3 of the holder 31.
openings 1b and l of cassette l through 1b and 31a
Enter a. At this time, the outer cover 35 is
As shown in FIG. The center core 3 of the magnetic disk 2 is urged toward the spindle 6 by the portion 38a, so that its lower surface comes into contact with the flange surface 6b of the flange portion 6a of the spindle 6.

At this time, the quantitative difference between the push-in stroke of the outer cover 35 and the required push-in amount of the center core 3 is
It is absorbed as a deflection of 8.

Here, when the cassette l is inserted into the holder 31, in the state shown in FIGS. 3B and 3C, the cassette loading/unloading detection lever 66 shown in FIG. It is rotated clockwise against the spring 68, and at this time, the pressing part 66
c to push down the arm portion 66c of the switch operation lever 62. As a result, the operating lever 62 is moved to its switch operating section 6.
2a, the contact piece 70a of the cassette loading/unloading detection switch 70
Press down and bring it into contact with the contact piece 70b to turn it on.

Also, at this time, the cassette presence/absence detection switch 69 is turned on by itself because its contact piece 69a is released from being depressed by the switch operating portion 66d of the detection lever 66.

Of course, if the cassette l is not inserted into the holder 31, the detection lever 66 will not be rotated clockwise, and therefore the switches 69 and 70 will both remain off.

As can be understood from the above, in this embodiment, the arm from the switch operation lever 62 is connected to the cassette loading/unloading detection lever 6.
The fact that the cassette l has been taken out is memorized by being switched to the position where the cassette l is rotated until it enters the lower side of the pressing part 66c of the holder 31, and this memorization signal is then transmitted to the state that the cassette l is loaded in the holder 31. When this is pushed down together with the outer cover 35 and set to the state shown in FIGS. 3B and 3C, the cassette loading/unloading detection switch 70 is turned on.

Now, as shown in FIG. 3B, when the outer cover 35 is pushed in, the lock pin 36a is implanted in the outer cover 35.

36b, the pin 36b is connected to the tail end 18a of the tension lever 18.
is pushed down and the lever 18 is rotated counterclockwise about the shaft 17 against the spring 19, thereby disengaging the hook portion 18b from the claw portion 21d of the lock lever 21. As a result of this disengagement, the lock lever 21 moves to the left by the biasing force of the spring 22 as shown in FIG. 4B, and at this time, the claw portions 21a and 21b are located above the lock pins 36a and 36b, respectively. It will be like that. At this time, the lock lever 23 is prevented from moving to the left by the spring 24 because the side end of the claw portion 23a or 23b hits the locking pin 36a or 36b from the side.
The movement of the lock lever 21 is made to stay there. Then, when the outer cover 35 is released, the outer cover 35 is moved to the hinge shaft 1 by the biasing force of the spring 14.
I try to turn 2 counterclockwise for communication, but at this time,
Lock pins 36a, 36b and lock lever 21
The claw portion 21a.

21b are engaged with each other, and their rotation is prohibited. Also, at this time, the lock lever 23 moves to the left due to the biasing force of the spring 24 until it is regulated by the bent portion 21c of the lock lever 21, and the lock lever 23 engages with the claw portions 23a, 23b.
Pins 36a and 36b engage as shown in FIG. 4C.

That is, at this point, the outer cover 35 is fixed to the main body chassis 11. In this state, the contact piece 74a of the lock completion detection switch 74 is brought into contact with the contact piece 74b by the switch control arm 23d of the lock lever 23 and turned on, and the tip of the leaf spring 38 provided on the outer cover 35 is turned on. The protrusion 38a breaks contact with the center core 3 as shown in FIG. 3C, and the magnetic disk 2 is properly attached to the spindle 6, and in this state is rotated by the rotation of the spindle 6. It will be like that.

Incidentally, in order to take out the cassette 1, the bent portion 21e of the locking lever 21 protruding from the slot-shaped opening 16 of the side plate 16 is pressed against the spring 22. 24 to the right in FIG. 40 to bring the lock lever 21 into the state shown in FIG. 4A, where it is locked by the tensioning lever 18.
When the lock lever 23 returns to its original position and the switch 52 opens, the outer cover 35 and holder 31 are
3A due to the action of 14 does not require a detailed explanation.

In addition, in 3A, 3B, and 30, 43 is the holder 3.
The positioning member 43 is a positioning member for the cassette 1 provided at the bottom of the interior of the cassette 1. It is possible to provide a leaf spring 44 or the like that presses against the member to ensure reliable positioning of the cassette 1 with respect to the holder 31.

Here, as a modification of the cassette loading and disc loading mechanism described above, for example, the holder 31 may be omitted and the hinge shaft 12 of the main body chassis 11 may be replaced with the holder 31.
The fixed cassette receiver may form a receptacle in the space sandwiched between the side plate 16 and the side plate 16 by using a frame or the like having a shape that matches the shape of the cassette L, and the cassette 1 may be thrown into this receptacle. In that case, an elastic member such as a leaf spring, sponge, or soft rubber is attached to the ceiling of the outer cover 35, and the cassette 1 is held against the main body chassis 11 with the outer cover 35 in the locked state as shown in FIG. 3C. The cassette l is pressed against the main body chassis 11.
This allows the device to be held in a fixed state relative to the object. Also, in this case, it is possible to operate manually or
The receiving part of the main body chassis 11, which is linked to the opening operation of the outer cover 35, makes it possible to add a means for jetting ink from the receiving part.

Further, as a modification of the storage means shown in FIG. 5, for example, only the switches 69 and 70 and the gear 71 are arranged on the main body chassis side, and the operating lever 62 and the detection lever 66 are arranged in the holder 31 in the manner shown in FIG. The cassette sensing piece 66a of the detection lever 66 is placed on the back side of the opening 31 of the holder 31.
When the holder 31 and the outer cover 35 are set in the states shown in FIGS. 3B and 3C, the levers 66 and 62 are activated by the switch 69, respectively.
and 70, and the reset lever 73 may be configured to be able to act on the lever 62.

Next, the magnetic head moving mechanism will be explained with reference to FIG.

In the figure, reference numeral 5 denotes the aforementioned magnetic head, which is fixed to the head carrier 46 via the head mounting board 9 in its hole 46c. The head carrier 46 is directed to a guide rail 47 via a sliding pole 48 and is movable along the guide rail 47. The balls 48 are recessed into V-shaped grooves 46e and 47 fathoms at each side end of the head carrier 46 and guide rail 47. 4
6d is the head carrier 46 to escape the spindle 6.
It is a long hole formed in. An engaging portion 46b for the head moving screw 54 is provided at the tip of the arm portion 46a of the head carrier 46. The arm portion 46a
A backlash elimination spring 5 is provided between the fixed pin 57 and the fixed pin 57.
6 is multiplied by the carrier 46 in the figure.
It is energized in the direction of arrow X, that is, downward, and the backlash of engagement between the engaging portion 46b and the screw 54 is eliminated.

The screw 54 is attached to the center of the shaft 51,
The shaft 51 is rotatably supported by a bearing 52, and a worm wheel 53 and a worm gear 55 are attached to both ends thereof. Warm
The wheel 53 meshes with a worm gear 50 attached to the output shaft 49a of the step motor 49 for moving the head, and the worm gear 55 meshes with the gear 71 in FIG.
It meshes with the

Therefore, when the step motor 49 rotates, the rotation is transmitted to the shaft 51 through the meshing of the worm gear 50 and the worm wheel 53, causing the screw 54 to rotate.
b is moved according to the thread lead of the screw 54 through engagement with the screw 54, and
In this case, the direction of movement can be determined by the direction of rotation of the motor 49, and the amount of movement corresponding to a unit track pitch on the disk 2 can be completed by the number of rotational steps of the motor 49. Of course, in this case, the gear 71 is rotationally driven through the worm gear 55.

Incidentally, 58 and 59 are detectors for detecting that the head 5 leaves a predetermined recording area on the disk 2 at the outer circumference side and the center side of the disk 2, respectively, and the light emitting element 58
It has the structure of a well-known photocoupler, which includes light receiving elements 58b and 59b, and carrier 4.
It is arranged so as to detect light shielding plates 46f and 46g attached to 6.

In the following explanation, it is assumed that 50 recording tracks can be set in the predetermined recording area on the disk 2 with a predetermined track pitch (for example, 100 μm).
It is assumed that each track is numbered from 1 to 50 from the outer circumference of the disk 1 toward the center. In this case, the detector 5
8 is the point in time when the head 50 is moved further toward the outer circumference of the disk by one track pitch from the first track position (
Hereinafter, for convenience, the position of the head 5 at this time will be referred to as the first track position).
The point in time when the head 5 is moved toward the center of the disk by the track pitch (hereinafter, for convenience, the position of the head 5 at this time will be referred to as the 51st position).
They are respectively arranged so as to detect the light shielding plate 46g at the track position. Further, the gear 73 moves clockwise (fifth direction) in response to the movement of the carrier 46 in the direction of the arrow
(counterclockwise in the figure), the reset lever 73 is rotated counterclockwise (clockwise in FIG. 5) in response to movement in the direction opposite to the arrow. When the switch is further moved from the 51st track position to the center of the disk by 5 track pitches, the tail end 62b of the switch operation lever 62 is moved to its rising portion 73a.
It is assumed that the setting is such that the arm portion 62c of the lever 62 and the pressing portion 66c of the detection lever 66 are disengaged from each other by being pressed. It is also assumed that the carrier 46 is moved in the direction of arrow X by forward rotation of the step motor 49, and in the opposite direction by reverse rotation.

Next, the electric circuit system of the recording apparatus having the above mechanical configuration will be explained with reference to FIG. Note that this figure shows an example of a circuit system when the present invention is applied to a still video recording device.

In the figure, 81 is a camera unit having a well-known configuration for forming a video signal, 82 is a recording circuit for recording the video signal output from the camera unit 81 onto the disk 2 through the head 5, and 83 is a recording circuit for recording the video signal output from the camera unit 81 onto the disk 2. A recording control circuit 84 controls the recording circuit 82 to record video signals for one field or one frame, and 84 is a synchronization signal generator for generating horizontal and vertical synchronization signals H3, vS, etc. circuit, the output of which is sent to the camera section 81. It is attached to a recording circuit 82, a recording control circuit 83, and a disk motor control circuit 89, which will be described later.

Note that the recording control circuit 83 outputs a recording end signal RE upon completion of recording by the head 5.

Reference numeral 85 indicates a recording presence detection circuit for detecting the presence or absence of recording at each recording position on the disk 2, that is, the presence or absence of a video signal through the head 5. Reference numeral 86 indicates the connection between the head 5 and the output of the recording circuit 82 (terminal R side). This is a changeover switch for switching to the input (terminal C side) of the detection circuit 85.

Reference numeral 87 is a step motor drive circuit for driving the head moving step motor 49 (Fig. 6), which will be described later.
Driven in synchronization with pulses. 88 is a disk rotation motor for rotating the disk 2 through the spindle 6; 89 is a disk motor control circuit that controls the motor 88; The rotation speed signal FG, which is 16 equally spaced pulses per rotation, the vertical synchronization signal vS from the synchronization signal generation circuit 84, and the magnetic pin 3e buried in the center core 3 of the disk 2 are detected. Based on the disc rotational phase signal PG from the disc rotational phase detector 90, the disc 2 is rotated at a predetermined speed corresponding to the field or frame frequency of the television (3.6.00 to 1.80O in terms of the NTSC system).
The motor 88 is controlled so as to rotate at a predetermined phase relative to the timing of the vertical synchronization signal vS. The control circuit 89 outputs a servo lock-in signal SL when the motor 88 starts rotating at a specified speed and a specified phase.

Reference numerals 91 include a recording trigger switch 95, which will be described later, a mode changeover switch 97, a cassette presence/absence detection switch 69, which will be described above;
Cassette loading/unloading detection switch 70. Outer cover/lock completion detection switch 74, carrier position detectors 58 and 59,
A system controller that controls the entire circuit system shown in FIG. 7 based on the recording end signal RE from the recording control circuit 83, the servo lock signal SL from the motor control circuit 89, the power-on signal Po obtained when the power is turned on, etc. It is.

92 is a display including a light emitting or sounding element, 93 is a power supply circuit including a battery, 94 is a power switch, 95 is a recording trigger switch, and 96 is a trigger button. The power switch 94 and the recording trigger switch 95 are respectively turned on by pressing down to the second level. 97 is a single shooting mode (a mode in which one field or one frame is recorded per operation of the trigger switch 95) and a continuous shooting mode (a mode in which recording is repeated at a predetermined speed as long as the trigger switch 95 is turned on). ) is a mode changeover switch that allows you to switch between single-shot mode when off and continuous-shot mode when on.

It goes without saying that only the trigger switch 95 may be operated by the trigger button 96, and the power switch 94 may be operated by another member.

Further, the recording presence/absence detection circuit 85 is configured to detect the presence or absence of an RF (radio frequency) signal when the recording signal is an FM signal, for example, and outputs a high signal when there is recording.

For example, the system controller 91 uses this detection circuit to sample the RF detection output level of a signal on a track at FG timing, and when the RF detection output level at each FG point on the track is equal to or higher than a predetermined value, that point is If there are more than a predetermined number of RF points on the same track, this track is considered to have been recorded, and the head is sent to the next track without looking at the remaining FG points and checked in the same way. Therefore, the determination operation is fast when the track is already recorded.

Further, the system controller 91 includes a microcomputer etc. as a main component, and its operation will be explained below with reference to an operation flowchart.

In the above configuration, first, the preparation operation for recording when the power switch 94 is turned on by pressing down the first stage self-propelling trigger button 96 will be described with reference to FIG.

When the power is turned on (step 5OI), the system controller 91 activates the outer cover lock completion detection switch 7.
Check whether 4 is turned on or not.Step 5
02) If it is not turned on, it waits until it is turned on. On the other hand, if it is on, the controller 91 then checks whether the cassette loading/unloading detection switch 70 is turned on (step 503), and if it is on, the cassette l is being replaced (loading/unloading). Because there will be
An automatic positioning operation of the head 5 to an unrecorded position on the disk 2, which will be described below, is performed.

That is, first, in order to prevent the recording surface of the disk 2 from being damaged due to the movement of the head 5 while the disk 2 is stopped, the controller 91 instructs the disk motor control circuit 89 to operate the motor 88. The motor 88 is rotated by the command. (Step 5O4)
In this case, the rotation speed is controlled by the FG pulse. Subsequently, the step motor drive circuit 87 is
By commanding continuous forward rotation of the motor 49, the motor 4
9 is continuously rotated forward (step 505). In this case as well, the head is shifted in synchronization with the FG pulse. This allows the head 5 to be continuously moved toward the center of the disk 2, that is, in the direction of the arrow X in FIG.

During this time, the controller 91 determines whether the carrier position detector 59 shown in FIG. Repeat this check (step 806), and once the motor 49 is turned off, command the motor 49 to stop (step 5O7). Thereafter, the controller 91 immediately instructs the drive circuit 87 to rotate the motor 49 forward in steps to further move the head 5 in the direction of the arrow X by five track pitches (hereinafter referred to as TP) (step 808). As a result, the reset lever 73 shown in FIG. 5 rotates the switch operating lever 62 clockwise in the figure to detach its arm portion 62c from the push-down portion 66c of the cassette loading/unloading detection lever 66, thereby allowing the cassette to be loaded. Detachment detection switch 7
o returns to the OFF state, while the operating lever 62 is returned to a neutral state in which its arm portion 62c can collide with the falling portion 66b of the detection lever 66 due to the action of the spring 63. Therefore, from now on, the operating lever 62 will be replaced by the reset lever 7.
3 is released, it abuts against the falling portion 66c of the detection lever 66 and has no effect on the switch 70.

Now, the controller 91 controls the step motor 49 to 5T.
After forward rotation in steps P minutes, the same motor 4 is then moved in order to move the head 5 by 5 TP in the direction opposite to the arrow X.
9 step reversal is commanded to the drive circuit 87 (step 5O9). This causes the head 5 to move to the 51st position on the disk 2.
) is now set to the rack position.

Next, the controller 91 connects the changeover switch 86 to the terminal C side (step 5IO), and in this state moves the head 5 by ITP in the direction opposite to the arrow (step 511). As a result, the head 5 is set to the 50th track position.After this, the flag n is set to n.
=o and reset the timer T (step 120)
. In this state, the recording presence/absence detection circuit 85 is connected to the head 5 through the changeover switch 86;
5 indicates the presence or absence of a recording signal on the disk 2 based on the signal picked up by the head 5 (in this case, the presence or absence of a recording signal at each FG pulse timing at the 50th rack position)
is detected, and outputs a high signal if it is present, and a low signal if it is absent. Then, the controller 91 checks whether the output of the detection circuit 85 is high every time an FG pulse arrives, and if there is a high portion (step 5121), it adds this to the high number n. (Step 5122
), and if n≧X in step 123, it is assumed that a signal is recorded on this track, and step S14
Proceed to. However, if n<x, it is determined in step 5124 whether the period T during which the disk rotates once has elapsed, and if it has not elapsed, the process returns to step 5121. If it has elapsed, it is assumed that the track is unrecorded and step S13
In order to confirm whether or not the head 5 has reached the 0th track position, the carrier position detector 58 shown in FIG.
(Step 513)
If it is not off, return to step Sll and turn head 5 again.
motor 4 to move it by ITP in the direction opposite to the arrow
9 step reversal is commanded. Note that here, X is an integer smaller than the number of FG pulses per rotation, and in this embodiment, the number of FG pulses is set to be 15 per rotation, and X is set to 5. Thereafter, steps Sll and 5 are performed until n≧X or the detector 58 is turned off.
120 to 124 and the operations of S13 are repeated. And n
≧X, or when the detector 58 is turned off, the motor 49 is commanded to rotate stepwise forward in order to move the head 5 by the amount of ITP in the direction of the arrow X (step 51).
4). That is, n≧X means that the head 5 has reached the position of the last recorded track on the disk 2 counting in the order of the recording track number, and therefore, the process moves from step 5123 to step Si4. According to
The head 5 is now set at the unrecorded position immediately following this last recorded track (that is, in this case, the disk 2 has been recorded up to an intermediate track).

On the other hand, the fact that the detector 58 is turned off means that the head 5
means that the head 5 has reached the 0th track position on the disk 2. Therefore, by reaching step S14 from step S13, the head 5 has been set to the 1st track position (i.e., in this case (This means that disc 2 is a fresh disc with no recording performed.) In addition, as mentioned above, the motor 49 is
．． 88. Since the presence or absence of recording is detected, there is no need to generate a special synchronization signal in the synchronization signal generator, and the circuit configuration becomes simple. Creating such a synchronization signal with a microcomputer would complicate the program, but using such an FG has the effect of simplifying the program.

Now, when the controller 91 counts the heads 5 in the order of recording track numbers and sets them to the unrecorded position immediately after the last recorded track, the controller 91 moves the disk motor 88 to the unrecorded position immediately after the last recorded track.
(step 515), and the detector 5 is instructed to stop.
9 is off (step 816), and if it is not off, the display 92 will indicate that recording is possible (or that preparation for recording has been completed).
, display (step 17), and if it is off, display on the display 92 to indicate that recording has been completed at all recording positions on the disc 2 (disc end) (step 518). prohibited (step 519).

On the other hand, in the previous step S03, if the cassette loading/unloading detection switch 70 is not turned on, the cassette 1 is replaced (
In step 520), the controller 91 checks whether the cassette presence/absence detection switch 69 is on or not. If the cassette 1 has not been replaced (loaded or removed), the process moves to the previous step 16.

On the other hand, if the detection switch 69 is not turned on, this means that the cassette l is not loaded (no cassette), and the controller 91 causes the display 92 to display a message to that effect. let (step 521)
, and prohibits recording (step 519).

In this embodiment, the preparation operation for recording is performed as described above.

Next, the recording operation of the video signal by turning on the recording trigger switch 95 after the preparation operation for recording is completed as described above will be explained with reference to FIG.

When the preparatory operation for recording is completed as described above, the controller 91 checks whether the recording trigger switch 95 has been turned on by pressing down the trigger button 96 in the second stage, unless the power is turned off. This will be repeated (step 531).

Then, when the trigger switch 95 is turned on, the controller 91 switches the changeover switch 86 to the terminal R side (
Step 532), the camera section 81 and the synchronization signal generation circuit 84 are operated, and the disk motor 8
8 is commanded to the motor control circuit 89 (step 533). As a result, the camera section 81 outputs a video signal synchronized with the synchronization signals H5 and VS from the synchronization signal generation circuit 84, and the recording circuit 82 processes the video signal from the camera section 81 as a recording signal ( F
M modulation, etc.) (Of course, in this state, the recording gate in the recording circuit 82 is off, and therefore the head 5 is connected to the recording circuit 82 via the changeover switch 86, (no recording is done). On the other hand, the motor control circuit 89 determines whether the disk 2 is in the field based on the speed signal FG from the motor 88, the rotational phase signal PG from the rotational phase detector 90, and the vertical synchronization signal vS from the synchronization signal generation circuit 84. Or, the rotation of the motor 88 is controlled at a speed corresponding to the frame frequency and at a predetermined phase with respect to the vertical synchronization signal vS, and when the motor 88 starts to rotate at the specified speed and phase. So 1.
Set the servo lock-in signal SL to high. here,
After commanding the operation of the motor 88, the controller 91 repeatedly checks whether or not the servo lock-in signal SL from the control circuit 89 has become high (step 534). When it becomes high, a recording trigger is immediately given to the recording control circuit 83 (step 535). As a result, the recording control circuit 83 uses the synchronization signals H3 and VS from the synchronization signal generation circuit 84 to control the recording circuit 83 for l field or l frame period including the first vertical synchronization signal VS immediately after this recording trigger is applied. Turn on the recording gate. As a result, the recording signal for l fields or l frames is changed to the changeover switch 86.
The information is applied to the head 5 through the head 5 and recorded on the disk 2 which is rotated by the motor 88 in exactly one revolution. Of course, in this case, the recording position of the vertical synchronizing signal vS is a predetermined rotational position with respect to the magnetic pin 3e of the center core 3.

The recording control circuit 83 records the l field or 1 as described above.
After one frame's worth of recording is completed, the recording end signal RE is made high. On the other hand, after the recording trigger, the controller 91 repeatedly checks whether the recording end signal RE has become high (step 836).
When this becomes high, the motor drive circuit 87 is commanded to rotate the step motor 49 forward in steps in order to move the head 5 to the next recording position, that is, by ITP in the direction of the arrow X (step 537). Next, the controller 91 checks whether the mode changeover switch 97 is turned on (step 538), and if it is not turned on (in other words, this indicates that the single-shot mode is designated), the camera unit 81 and the synchronization switch are turned on. The operation of the signal generation circuit 84 is stopped, and the motor control circuit 89 is commanded to stop the disk motor 88 (step 539).

Thereafter, the controller 91 checks whether the detector 59 has turned off due to the movement of the head 5 (step 540), and if it has turned off, causes the display 92 to indicate the end of the disc (step 540). 541), and subsequent recording is prohibited (step 542).

Hereinafter, when the switch 97 is off, that is, when the transfer mode is designated, each time the recording trigger switch 95 is turned on, the data is transferred to a different position on the disk 2 by the above-described operation unless the detector 59 is turned off. A signal for one field or one frame is now recorded.

On the other hand, if the mode changeover switch 97 is on in step S38 (that is, this indicates that the continuous shooting mode is designated), the controller 9
1 checks whether the trigger switch 95 is still on at this point (step 543), and if it is not on, the process moves to the previous step S39, but if it is on, the detector 59 is further turned on. Check whether it is turned off (step 544), and if it is not turned off, wait for the elapse of a predetermined time Δt for determining the speed or rate for continuous recording (step 545), and proceed to the next step as the time elapses. Returning to S35, recording is triggered again.

If the detector 59 is off in step S44, the controller 91 stops the operation of the camera unit 81 and the synchronization signal generator 84, and commands the motor 88 to stop, as in step S39 (step 546). After that, the process moves to step S41.

When the switch 97 is on, that is, when the snapshot mode is designated, as long as the recording trigger switch 95 is on, the above-described operation will record the differences on the disk 2 at a predetermined speed until the detector 59 turns off. One field or one frame worth of video signal is continuously recorded at the position.

In addition, the speed or rate of continuous shooting in this case is Stella.

By making the waiting time Δt in step S45 variable, it can be changed arbitrarily.

As described above, in this embodiment, when positioning the head 5 to the recording position on the disk 2 in the recording preparation operation, the head 5 is moved from the last recording position on the disk 2, that is, from the 50th track position. , check the presence or absence of recording at each recording position in the reverse order of the track setting order at the time of recording, that is, the reverse order of the recording track numbering order, and check the position where it is determined that there is recording first. Since the position is moved back by ITP from the point where the disc 2
Even if the track has been recorded up to the middle and the middle track has been erased, the head 5 will not be positioned with respect to the erased track.
Therefore, there are inconveniences associated with recording on this erased track, such as the inconvenience that when moving the head 5 to the next recording position, it is necessary to determine whether or not there is recording at each moving position. , it takes time before the next record can be made, and the chance of recording is lost.
Alternatively, the inconvenience of not being able to perform continuous recording properly can be completely eliminated.

In addition, as shown in Figure 5, by imitating a means for mechanically remembering that a cassette has been replaced (installed or removed), the cassette can be replaced (installed or removed) even when the power is turned off. It is possible to know with certainty whether or not the incident occurred, and when recording,
Since it is possible to take measures accordingly, there is the problem of power wastage caused by resetting the head 5 to a non-recording position even though it is not necessary (this is especially true for portable devices that use batteries as a power source). (This is a serious problem in type equipment)
or a chance to record (shutter chance in camera terms)
It is possible to avoid the inconvenience of being easily missed,
This is a rational system configuration.

[About the modified example]

One embodiment of the present invention has been described above. Next, a modification of the above embodiment will be described. Description of the same steps as in FIG. 8 will be omitted. After step 311, B=O
, T are reset (step 5125). Next, at step 5126, R at the timing of FG on the track.
The F detection output level is sampled, and the sampling value at each FG point is defined as A.

Next, in step 5127, this is added to B and replaced with B. Next, it is determined in step 5128 whether the cumulative value B has reached a certain level 7 or higher, and if it has reached the level 7, the RF
If it is determined that there is a track, the process proceeds to step S14 and checks the next track in the same manner. If the time has not been reached, then it is determined in step 5129 whether or not the time for one round of the track has elapsed. If the time has not elapsed, the process returns to step 8126, and if the time has elapsed, the process proceeds to step 13. For this reason, as in the previous embodiment, when recording has been completed, the detection time is short because the next track is checked without looking at all the FG pulse points.

In addition, select several FG points on the track, and if the average of the sampling results exceeds a certain value of the RF level, R
It may be assumed that F is present.

〔effect〕

As described in detail above, according to the present invention, the signal level on a track is sequentially detected, and when the detection result reaches a predetermined standard, the track is recorded before the signal level of the entire track is detected. Since it is determined that the track has already been recorded, it is possible to determine in a short time whether a signal has been recorded on the track or not. In addition, since the presence or absence of a signal on a track is checked at the timing of the FG pulse, it is less susceptible to dropouts and does not require a special synchronization signal, which simplifies the configuration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a record carrier, its holder, and a drive unit on the apparatus side used in an embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention, particularly cassette loading and 3A, 3B, and 3C are exploded perspective views of the disk loading mechanism, and sectional views taken along the line A-A in FIG. 4B and 4C are detailed plan views showing various states of the cover/lock part in the mechanism shown in the second figure, and FIG.
FIG. 6 is a plan view of an embodiment of the present invention, particularly the head moving mechanism, and FIG. 7 is an electrical diagram of an embodiment of the present invention. A block diagram showing the configuration of the circuit system, FIG. 8 is a flow chart showing the control flow of the recording preparation operation of the system controller in FIG. 7, and FIG. 9 also shows the control flow of the recording operation of the system controller. Flow Chart FIG. 10 is a flow chart showing the control flow of the recording preparation operation of the system controller in a modification of the above embodiment. 1...Magnetic disk cassette, 2...Magnetic disk, 5...Magnetic head, 6...Disk rotation spindle, 11...Main body chassis, 21.23... Lock lever, 31...Cassette holder, 35...Outer cover, 46...-Head carrier, 49...Step motor, 54...Screw, 58.59. ...Carrier position detector, 62...
Switch operation lever, 66...Cassette loading/unloading detection lever, 69...Cassette presence/absence detection switch, 70...Cassette loading/unloading detection switch, 71...Gear, 73...Reset... Lever, 74... Outer cover/lock completion detection switch 81...
... Camera section, 82 ... Recording circuit, 83 ... Recording control circuit, 85 ... Recording presence/absence detection circuit, 86 ... Changeover switch, 88 ... Disk rotation motor, 91...System controller, 92...Display unit, 93...Power circuit, 94...Power switch, 95...Recording trigger switch, 97... Mode change switch. 4th A, 4th B, 4th C 23d 21e sqbstn.

Claims (2)

[Claims] (1) Detection means for sequentially detecting the signal level of a track along the track, and when the detection result of the detection means reaches a predetermined standard, the track position is detected before detecting the signal level over the entire range of the track. A discriminating device having a discriminating means for discriminating that a recording has been made. (2) A head that moves relative to the track along the track, a motor for making the relative movement, and a periodic signal forming means that forms a periodic signal according to the displacement of the motor, and the periodic signal 2. The discriminating device according to claim 1, wherein the detecting means samples a signal on a track obtained via the head in synchronization with a periodic signal from the forming means.