JPH0443351B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to head positioning in a recording device in which a recording head is moved in a predetermined direction with respect to a record carrier, and recording is performed at each moving position. Regarding the method.

[Conventional technology]

For example, a rotary record carrier such as a magnetic disk or a magnetic drum is used, and a movable head forms concentric or annular recording tracks, and each track records a unit length of information (for example, one field or one frame worth of information). In a recording device that records video signals, etc., if you want to record information while preventing double recording, it is necessary to correctly position the head on the unrecorded part of the record carrier before recording. becomes.

Conventionally, prior to recording, the presence or absence of recording at a recording position on the record carrier is detected, and if there is recording, the head is moved to the next recording position, and the operation is repeated. A head positioning method is already known in which the head is positioned in an unrecorded area on the record carrier. (for example,
This is disclosed in Japanese Unexamined Patent Application Publication No. 140515/1989 filed by the applicant. [Problems to be Solved by the Invention] By the way, according to the above-described head positioning method, if an intermediate recording track on the record carrier is erased, the head first moves to the erased track. Therefore, even when the head is moved to the next recording position after recording at this position, it is necessary to determine whether or not there is recording at each moving position of the head. become. That is, otherwise it would be impossible to prevent double recording. In this case, since the head is moved to an unrecorded position, it takes time until the next recording is possible, and the chance of recording (that is, what is called a shutter chance in a camera) is lost. Alternatively, continuous records (e.g.
Continuous still video recording of several fields or frames per second) cannot be performed properly.

[Means for solving problems]

The present invention includes loading a record carrier, moving a head in a predetermined direction with respect to the loaded record carrier, and
A method for positioning a head in a recording device in which recording is performed at each movement position, wherein the loading of the record carrier is detected, and when the loading of the record carrier is detected, the recording head is positioned on the record carrier. The presence or absence of a record at each recording position on the record carrier is determined sequentially from the predetermined position in the direction opposite to the predetermined direction, and when it is determined that there is a record for the first time, the determination is made. The above problem is solved by positioning the head at a position shifted by a predetermined amount in the predetermined direction from the head position.

〔Example〕

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

In FIG. 1, reference numeral 1 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 3 is provided on the lower surface of the center core 3.
d (shown in figures 3B and 3C), and 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 has openings 1 on the top side and on the bottom side.
a and 1b are provided, and stabilizers 37 and 15 are provided for stabilizing the rotation of the magnetic disk 2, respectively.
(Figure 2) is now open for entry. Then, the recording magnetic head 5 comes into contact with or closely opposes the recording surface of the magnetic disk 2 through the lower opening 1b.

The center core 3 is attached to the spindle 6 for driving the rotation of the magnetic disk on the loading side, and has an engagement hole 3c therefor, and the engagement hole 3c is formed by two sloped portions 3b and a spring portion 3a. and
The center core 3 is attached to the spindle 6 by the 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 6 of the spindle 6 is
A is provided with a permanent magnet 7, and the center
When the core 3 is attached to the spindle 6, its magnetic plate 3d is attracted by the permanent magnet 7 on the spindle 6 side to perform so-called magnetic chucking.
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 1 corresponding to the center core 3.

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

First, referring to Figure 2, in the same figure, 1
Reference numeral 1 indicates a main chassis of the recording apparatus, and the above-mentioned spindle 6 and head 5 are rotatably and movably provided on the main chassis 11, respectively. 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 to which a force is applied clockwise by a spring 19 is attached to the shaft 17. It is rotatably provided. Furthermore, a pair of pins 20 are planted on the same side plate 16, and two lock levers 21 and 23, which are slidable while being guided by the pins 20, are biased to the left in the figure by springs 22 and 24, respectively. ing. Note that 41 and 42 are spring hanging pins for the springs 22 and 24, 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 a hinge portion 31e. The holder 31 has an opening 31f at one end for receiving the aforementioned cassette 1, and the cassette 1 is inserted through the opening 31f. Openings 31a and 31b provided in the holder 31 are connected to stabilizing plates 37 and 1, which will be described later, respectively.
The openings 31c and 31d are for allowing the entry of the spindle 6 and the protrusion 38 of the center core pressing leaf spring 38, which will be described later.
This is to allow entry of a.

The opening 31g provided on the lower surface side allows entry of a cassette sensing piece 66a of a cassette loading/unloading detection lever 66 (FIG. 5), which will be described later, and is provided so as to protrude through the hole 11b of the main body chassis 11. belongs to.

Reference numeral 35 denotes an outer housing member, that is, an outer cover, and the outer cover 35 is rotatably attached to the main body chassis 11 around the aforementioned hinge shaft 12 through a hinge portion 35a. The outer cover 3
On the tip side surface 35c of 5 is a lock pin 36a,
36b is implanted, and a hook member 40 for the holder 31 is also provided. Reference numeral 37 denotes an upper stabilizing plate attached to the ceiling of the outer cover 35, which sandwiches the magnetic disk 2 from above and below together with the lower stabilizer 15 provided on the main body chassis 11 side, and prevents vibrations when the magnetic disk 2 rotates. and prevent deformation. In this case, each stabilizer plate 3
7 and 15 and the magnetic disk 2, their positions are set so that an appropriate air layer is formed between them.
The head 5 protrudes through an opening 15a provided in the center of the lower stabilizer 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 ear portions 38c on both sides of the ear portions 38c are fixed to the ceiling portion of the outer cover 35, respectively, and are locked against the elasticity of the leaf spring 38, thereby reducing the initial force. The protrusion 38a is arranged so as to be above the spindle 6 in the attached state.

The arms of the spring 13 disposed on the hinge shaft 12 are applied to the holder 31 and the outer cover 35, respectively, and apply a rotational force in the opening direction between them. Further, the spring 14 applies a counterclockwise rotational force to the outer cover 35 by having one arm of the spring 14 applied to the main body chassis 11 and the other arm of the spring 14 to the outer cover 35 .

74 is provided on the main body chassis 11, and a lock
The contact piece 74a is pressed by the switch control arm 23d of the lever 23, and as shown in FIGS. 3C and 4C, which will be described later.
This is a normally open type outer cover lock completion detection switch arranged so that contact pieces 74a and 74b are in contact with each other in the state shown in the figure.

Here, with reference to FIG. 5, the structure of the storage means for mechanically storing information 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 pivotably supported by the shaft portion 61a of the pivot member 61 so as to be rotatable and swingable. The operating lever has a switch operating part 6 at its tip that is bent so that it is located above the contact piece 70a of the switch 70 in a neutral state.
It has 2a. 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. The pin 65 is arranged to receive the tail end 62b of the lever 62 so that its counterclockwise rotation can be restricted at a position where the switch operation part 62a is just above the contact piece 70a of the switch 70. . 64 is a retaining member for the spring 63 and the lever 61.

Reference numeral 66 denotes a nearly L-shaped cassette loading/unloading detection lever having a cassette sensing piece 66a at its tip, rotatably supported by a shaft 67, and supported by a spring 68.
Accordingly, in the figure, the cassette sensing piece 66a is moved in the counterclockwise direction, that is, the cassette sensing piece 66a is inserted into the hole 11b (on the top plate) of the main chassis 11
It is biased in the direction of protruding toward the holder 31 side through the spring 63, and further includes a falling portion 66b for receiving the arm portion 62c of the switch operating lever 62 against the spring 63, and a falling portion 66b for pushing down the arm portion 62c. It includes a push-down part 66c and a switch operation part 66d for pushing down the contact piece 69a of the switch 69.

69 is a normally closed type cassette presence/absence detection switch,
When the cassette 1 is not loaded, the cassette loading/unloading detection lever 66 is rotated counterclockwise by the spring 68, and the contact piece 69a is pushed down by the switch operating portion 66d, and the contact piece 69b is pressed down. When the cassette 1 is loaded, the third cassette is turned off.
As shown in Figures B and 3C, the lever 66 is connected to its sensing piece 6.
When the contact piece 6a is pressed against the bottom surface of the cassette 1 and rotated clockwise, the contact piece 69 is moved by its own sliding property.
A and 69b are arranged so that they are in contact and turned on.

Reference numeral 70 designates a normally open type cassette loading/unloading detection switch which is arranged so that it is turned on when the contact piece 70a is pressed down by the switch operation part 62a of the switch operation lever 62 and comes into contact with the contact piece 70b. .

Reference numeral 71 denotes a head 5 by a head moving mechanism which will be described later.
A gear rotated in relation to the movement of the shaft 72
It is rotatably supported by. 73 is gear 7
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, its rising portion 73a closes the tail end of the switch operation lever 62. By pressing the arm 62b and rotating it clockwise against the spring 63, the arm 62c is pressed against the pressing part 6 of the cassette loading/unloading detection lever 66.
This is to separate it from 6c.

Now, in the above configuration, in order to load the cassette 1, first, as shown in FIG. one end 35b of the chassis wall 1 from the main body.
1a and is stopped. In this case, the holder 31 attempts to rotate clockwise relative to the outer cover 35 due to the biasing force of the spring 13, but the hook member 40 provided on the outer cover 35
This causes it to be constrained to the position shown in FIG. 3A.

Here, the outer cover 35 and the holder 31 are
In the open state as shown in Figure A, the hook portion 18b of the tensioning lever 18 and the locking lever 18 are connected as shown in Figure 4A.
The claw portion 21d of the lever 21 is in an engaged state. Also, the bent portion 21c of the lock lever 21
and one end 23c of the lock lever 23 are in contact with each other, so that both the lock levers 21 and 23 are in a locked state at a position shifted to the right against the springs 22 and 24, respectively. Further, claw portions 21a and 23a and 21b and 23b provided on both lock levers 21 and 23 are located outside the locus of movement of lock pins 36a and 36b implanted in outer cover 35. In this state, the contact pieces 74a and 74 of the lock completion detection switch 74 mentioned above are
b is in a non-contact state.

In addition, in this state, as shown in FIG. 5, the cassette loading/unloading detection lever 66 is in a state of being rotated counterclockwise by the spring 68, so the switch operation lever 62 is moved toward the falling portion of the detection lever 66. The tail end 62 of the spring 63 is released from the restriction by the spring 66b.
b is rotated counterclockwise until it hits the pin 65 and is regulated, and the switch operation part 62a
is positioned directly above the contact piece 70a of the cassette loading/unloading detection switch 70. Further, the cassette presence/absence detection switch 69 has its contact piece 69a pushed down by the switch operating portion 66d of the detection lever 66, so that the contact pieces 69a and 69b are in a non-contact state.

Returning again to FIG. 3A, insert the cassette 1 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 are also inserted into the holder 3.
1 through the openings 31b and 31a of the cassette 1.
into openings 1b and 1a of. At this time, the outer cover 35 is moved to the third position as shown in FIG. 3B.
When pushed further in the direction of the arrow from the position corresponding to the cassette loading and disk mounting completion position shown in Fig. The core 3 is urged toward the spindle 6, and its lower surface comes into contact with the flange surface 6b of the flange portion 6a of the spindle 6. Incidentally, at this time, the quantitative difference between the pushing stroke of the outer cover 35 and the required pushing amount of the center core 3 is absorbed as the deflection of the leaf spring 38.

Here, when the cassette 1 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. In order to be pushed, it is rotated clockwise against the spring 68, and at this time, the arm portion 66c of the switch operating lever 62 is pressed down by the pressing portion 66c. As a result, the operating lever 62 can be moved to its switch operating section 6.
At step 2a, the contact piece 70a of the cassette loading/unloading detection switch 70 is pressed down, and this is brought into contact with the contact piece 70b to turn it on. Also, at this time, the cassette presence/absence detection switch 69 is activated by the switch operation part 66 of the detection lever 66.
Since the contact piece 69a is released from being depressed by d, it is turned on by its own sliding property.

Of course, if the cassette 1 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 understood from the above, in this example,
The fact that the cassette 1 has been taken out is memorized by being rotated to the position where the arm from the switch operating lever 62 enters the lower side of the pressing part 66c of the cassette loading/unloading detection lever 66, and , this memory signal is then transmitted to the outer cover 35 with the cassette 1 loaded in the holder 31.
3B and 3C, the cassette loading/unloading detection switch 70 is turned on.

Now, when the outer cover 35 is pushed in as shown in FIG. By rotating the lever counterclockwise about the shaft 17 against the spring 19, the hook portion 18b and the claw portion 21d of the lock lever 21 are disengaged. 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, its claws 21a and 21b are positioned above the lock pins 36a and 36b, respectively. It will be like that. At this time, the side end of the lock lever 23's claw portion 23a or 23b is connected to the lock pin 36a.
or spring 2 by laterally abutting against 36b.
4 is prevented from moving to the left, and the lock lever 21 is prevented from moving to the left.
Then, when the outer cover 35 is released from being pushed in, the outer cover 35 attempts to rotate the hinge shaft 12 counterclockwise due to the biasing force of the spring 14, but at this time, the lock pins 36a and 36b are locked. - The claw portions 21a and 21b of the lever 21 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 claw portions 23a, 23b and the lock pins 36a, 36b are moved. and are engaged 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, push the bent portion 21e of the lock lever 21 protruding from the slot-shaped opening 16 of the side plate 16 to the right in FIG. 4C against the springs 22 and 24.
1 is locked by the tensioning lever 18, as shown in FIG. ,1
There is no need for a detailed explanation of the state shown in FIG. 3A due to the action of step 4.

In FIGS. 3A, 3B, and 3C, reference numeral 43 indicates a positioning member for the cassette 1 provided at the bottom of the inside of the holder 31. In connection with closing the outer cover 35, the cassette 1
It is possible to securely position the cassette 1 with respect to the holder 31 by providing a leaf spring 44 or the like that presses the cassette 1 toward the positioning member.

Here, as a modification of the cassette loading and disk mounting mechanism described above, for example, the holder 31 may be omitted and the main body chassis 1 may be replaced.
A fixed cassette receiving part is formed in the space sandwiched between the hinge shaft 12 and the side plate 16 of the cassette 1 by a frame or the like having a shape that matches the shape of the cassette 1, and the cassette 1 is accommodated in this receiving part by being thrown into the space. In that case, an elastic member such as a leaf spring, sponge, or soft rubber may be attached to the ceiling of the outer cover 35, and the cassette 1 is moved to the main body chassis with the outer cover 35 in the locked state as shown in FIG. 3C. 11 so that the cassette 1 can be held in a fixed state relative to the main body chassis 11. In addition, in this case, the outer cover 3 may be operated manually or
It is possible to add a means for injecting ink from the cassette 1 from the receiving portion of the main body chassis 11 in conjunction with the opening operation of the main body chassis 11.

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 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 inserted into the holder 31 through the opening 31g of the holder 31.
When the outer cover 35 is set to the state shown in FIGS. 3B and 3C, the levers 66 and 62 can act on the switches 69 and 70, respectively, and the reset lever 73 can act on the lever 62. It may be configured so that.

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 guided by a sliding ball 48.
It is supported by a rail 47 and is movable along the guide rail 47. The balls 48 are recessed into V-shaped grooves 46e and 47a at each side end of the head carrier 46 and guide rail 47.
46d is a long hole formed in the head carrier 46 to allow the spindle 6 to escape. At the tip of the arm portion 46a of the head carrier 46, an engaging portion 46b for engaging the head moving screw 54 is provided. A spring 56 for removing backlash is hung between the arm portion 46a and the fixing pin 57, and the carrier 46 is urged in the direction of arrow The backlash of engagement with screw 54 is removed.

The screw 54 is attached to the center of the shaft 51, and 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. The worm 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 is connected to the gear 71 shown 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, and the screw 54 is rotated.
The screw 54 is moved according to the screw lead through engagement with the motor 49, and the moving direction in this case is determined by the rotation direction of the motor 49.
Furthermore, the amount of movement of a unit track pitch on the disk 2 can be controlled 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.

In addition, in 58 and 59, head 5 is disk 2.
This is a detector for detecting that the predetermined recording area on the disk 2 is deviated from the outer peripheral side and the center side of the disk 2, and is a well-known photodetector equipped with light emitting elements 58a, 59a and light receiving elements 58b, 59b, respectively. It has a coupler configuration and is arranged so as to detect light shielding plates 46f and 46g attached to the carrier 46.

In the following explanation, the predetermined recording area on the disk 2 has a predetermined track pitch (for example,
Assuming that 50 recording tracks can be set with a diameter of 100 .mu.m), each track is numbered from 1 to 50 from the outer circumference of the disk 1 toward the center. In this case, the detector 58 detects when the head 50 is moved one track pitch further toward the outer circumference of the disk than the first track position (hereinafter, for convenience, the position of the head 5 at this time will be referred to as the 0th track position). Also, the detector 59 detects the light shielding plate 46f at the point when the head 5 is moved one track pitch further toward the center of the disk than the 50th track position (hereinafter, for convenience, this time is The position of the head 5 will be referred to as the 51st track position), and the light shielding plate 46g is respectively arranged so as to be detected. In addition, the gear 73 is shown in the diagram of the carrier 46,
In response to movement in the direction of arrow
counterclockwise in the figure), and is rotated counterclockwise (clockwise in Figure 5) in response to movement in the direction opposite to 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 pressed by its rising portion 73a, and the arm portion 62c of the lever 62 and It is assumed that the detection lever 66 is set to disengage from the pressing portion 66c. Further, the carrier 46 moves in the direction of arrow X due to the forward rotation of the step motor 49.
It is assumed that by reversing, it is moved in the opposite direction.

Next, the electric circuit system of the recording apparatus having the above mechanical configuration will be explained with reference to FIG. still,
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 for controlling the recording circuit 82 to record one field or one frame worth of video signals; 84 a synchronization signal generation circuit for generating horizontal and vertical synchronization signals HS and VS; Its output is a camera section 81, a recording circuit 82, a recording control circuit 83, and a disk motor control circuit 8 to be described later.
9 will be granted. 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/absence 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; This is a changeover switch for switching the input (terminal C side) of the detection circuit 85.

87 is a step motor drive circuit for driving the step motor 49 (FIG. 6) for moving the head; 88 is a disk rotation motor for rotating the disk 2 through the spindle 6; and 89 is for controlling the motor 88. A disk motor control circuit, here, a reference speed signal from an internal reference oscillator, a rotation speed signal FG from the motor 88,
a vertical synchronization signal VS from the synchronization signal generation circuit 84;
Furthermore, based on the disk rotation phase signal PG from the disk rotation phase detector 90 that detects the magnetic pin 3e embedded in the center core 3 of the disk 2, the disk 2 corresponds to the field or frame frequency of the television. at a predetermined speed (3600 to 1800 rpm in NTSC format),
Further, the motor 88 is controlled so as to be rotated in a predetermined phase with respect 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, a cassette loading/unloading detection switch 70, which will be described later.
Outer cover lock completion detection switch 74, carrier position detectors 58 and 59, recording end signal RE from recording control circuit 83, servo lock signal SL from motor control circuit 89, and power-on signal PO obtained when power is turned on. This is a system controller that controls the entire circuit system shown in FIG. 7 based on the following.

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, here, pressing it to the first step turns on the power switch 94, and pressing it to the second step turns on the recording trigger switch 95. It is configured so that it can be done. 97 is a single shooting mode (a mode in which one field or one frame is recorded for each operation of the trigger switch 95)
and continuous shooting mode (a mode in which recording is repeated at a predetermined speed as long as the trigger switch 95 is turned on)
This is a mode changeover switch that allows you to set the camera to single-shot mode when it is off, and continuous mode when it is on.

Note that only the trigger switch 95 can be operated by the trigger button 96, and the power switch 9 can only be operated by the trigger button 96.
It goes without saying that 4 may be constructed so that it can be operated by other members.

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

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

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

When the power is turned on (step S01), the system controller 91 checks whether the outer cover lock completion detection switch 74 is turned on (step S02), and if it is not turned on, it is turned on. I will wait until then. On the other hand, if it is on, the controller 91 then checks whether the cassette loading/unloading detection switch 70 is on (step S03), and if it is on, the cassette 1
This means that the replacement (installation and removal) of the
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, when the disk 2 is stopped, the head 5 is
In order to prevent the recording surface of the disk 2 from being damaged due to the movement of the controller 9,
1 controls the motor 88 by instructing the disk motor control circuit 89 to operate the motor 88.
(step S04), and then instructs the step motor drive circuit 87 to continuously rotate the step motor 49 in the normal direction (step S05). As a result, the head 5 is placed on the center side of the disk 2, that is,
It is now possible to move continuously in the direction of the arrow X in FIG. During this period, when the head 5 reaches the 51st track position, the carrier position detector 59 shown in FIG.
9b (meaning of off)) is repeatedly checked (step S06), and when it becomes off,
Once, command the motor 49 to stop (step
S07). Thereafter, the controller 91 immediately activates the motor 49 to move the head 5 further by five track pitches (hereinafter referred to as TP) in the direction of the arrow X.
The drive circuit 87 is commanded to rotate in the forward direction (step S08). As a result, the reset lever 73 shown in FIG. 5 rotates the switch operating lever 62 clockwise in the figure to disengage its arm 62c from the push-down part 66c of the cassette loading/unloading detection lever 66, thereby removing the cassette loading. De-detection switch 7
0 returns to the OFF state, while the arm portion 62c of the operation lever 62 is moved to the detection lever 6 by the action of the spring 63.
It is possible to return to a neutral state where it can collide with the falling portion 66b of No. 6. Therefore, even if the operating lever 62 is no longer pressed by the reset lever 73, it will come into contact with the falling portion 66c of the detection lever 66 and will not have any effect on the switch 70.

Now, the controller 91 is the step motor 4.
After the motor 9 is rotated forward in steps of 5 TP, the drive circuit 8 is used to reverse the step of the motor 49 to move the head 5 by 5 TP in the direction opposite to the arrow X.
7 (step S09). This means that head 5 is set at the 51st track position on disk 2.

Next, the controller 91 switches the changeover switch 8
6 to the terminal C side (step S10), and in this state, instruct the drive circuit 87 to reverse the step of the motor 49 in order to move the head 5 by 1 TP in the direction opposite to the arrow X (step S11). . As a result, the head 5 is set to the 50th track position, but in this state, the recording presence/absence detection circuit 85
is connected to the head 5 through a changeover switch 86, and the detection circuit 85 is connected to the pick switch 86 in the head 5.
Based on the uploaded signal, the presence or absence of a recording signal on disk 2 (in this case, the presence or absence of a recording signal at the 50th track position) is detected, and if it is present, a high signal is output, and if it is not, a high signal is output. outputs a low signal.
Then, the controller 91 checks whether the output of the detection circuit 85 is high (step
S12), and if it is not high, head 5 is set to 0.
When the carrier position detector 58 of FIG. 6 reaches the track position, the carrier position detector 58 of FIG.
It is checked whether the light receiving element 58b is turned off (meaning the light receiving element 58b is turned off) (step S13), and if it is not turned off, the process returns to step S11 and the head 58b is turned off again.
The step reversal of the motor 49 is commanded to move the motor 49 by 1 TP in the direction opposite to the arrow X. Thereafter, the output of the detection circuit 85 becomes high, or the output of the detector 5
The operations of steps S11 to S13 are repeated until the switch 8 is turned off. Then, when the output of the detection circuit 85 becomes high or the detector 58 turns off, the motor 49 is commanded to rotate forward in steps in order to move the head 5 by 1 TP in the direction of the arrow X. S14). That is, when the output of the detection circuit 85 becomes high, it means that the head 5 has reached the position of the last recorded track on the disk 2 counted in the numerical order of the recorded tracks. By reaching S14,
The head 5 is now set at the unrecorded position immediately following this last recorded track (that is, in this case, recording has been performed on the disk 2 up to the middle track). On the other hand, detector 5
8 being turned off 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 reached the 1st track position. (In other words, in this case, disk 2 is said to be a fresh disk on which no recording has been performed.)

Now, when the controller 91 counts the heads 5 in the order of recorded track numbers as described above and sets them to the unrecorded position immediately after the last recorded track,
Specify to stop the disk motor 88 (step
S15) Then, it is checked whether the detector 59 is off (step S16), and if it is not off, the display 92 indicates that recording is possible (or the preparation for recording is complete). If it is off, the display 92 is displayed to indicate that recording has been completed at all recording positions on disk 2 (disk completed) (step S18). , prohibit recording (step S19).

On the other hand, if the cassette loading/unloading detection switch 70 is not turned on in the previous step S03, it means that the cassette 1 has not been replaced (loading/unloading) or the cassette 1 has not been loaded. The controller 91 checks whether the cassette presence/absence detection switch 69 is on (step S20), and if it is on, that is, if the cassette 1 has not been converted (loaded or unloaded), the process goes to step 16. Transition. On the other hand, if the detection switch 69 is not turned on, this means that the cassette 1 is not loaded (no cassette).
2, a message to that effect is displayed (step S21), and recording is prohibited (step S19).

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

Next, the recording operation of the biden 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 preparation operation for recording is completed as described above, the controller 91 determines whether or not the recording trigger switch 95 has been turned on by pressing the trigger button 96 to the second stage, unless the power is turned off. The check will be repeated (step S31). Then, when the trigger switch 95 is turned on, the controller 91 turns on the changeover switch 8.
6 to the terminal R side (step S32), and then
The camera unit 81 and the synchronization signal generation circuit 84 are activated, and the rotation of the disk motor 88 is instructed to the motor control circuit 89 (step
S33). As a result, the camera section 81 comes to output a video signal synchronized with the synchronization signals HS and VS from the synchronization signal generation circuit 84, and the recording circuit 8
2 processes the video signal from the camera unit 81 as a recording signal (FM modulation, etc.) (Of course, in this state, the recording gate in the recording circuit 82 is off, so the recording circuit 82 On the other hand, although the head 5 is connected via the changeover switch 86, no recording is performed). On the other hand, the motor control circuit 89 receives 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.
Based on this, the rotation of the motor 88 is controlled so that the disk 2 is at a speed corresponding to the field or frame frequency and at a predetermined phase with respect to the vertical synchronization signal VS. When it starts to rotate in phase, 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 S34). When it goes high, it immediately gives a recording trigger to the recording control circuit 83 (step
S35). As a result, the recording control circuit 83 uses the synchronizing signals HS and VS from the synchronizing signal generating circuit 84 to record one field or one frame period including the first vertical synchronizing signal VS immediately after this recording trigger is applied.
The recording gate of the recording circuit 82 is turned on. As a result, a recording signal for one field or one frame is applied to the head 5 through the changeover switch 86, and is 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.

After recording one field or one frame as described above, the recording control circuit 83 sets the recording end signal RE to high upon completion of recording. on the other hand,
After the recording trigger, the controller 91 repeatedly checks whether the recording end signal RE has become high (step S36), and when it has become high, moves the head 5 to the next recording position, that is,
The motor drive circuit 87 is commanded to rotate the step motor 49 in the forward direction in order to move it by 1 TP in the direction of the arrow X (step S37). Next, the controller 91 checks whether the mode changeover switch 97 is turned on (step S38).
If it is not turned on (that is, this indicates that the single-shot mode is designated), the operation of the camera unit 81 and the synchronization signal generation circuit 84 is stopped, and the motor control circuit 89 is instructed to control the disk motor 88. Command to stop (step S39). Thereafter, the controller 91 checks whether the detector 59 has turned off due to the movement of the head 5 (step S40), and if it has turned off, the display 92
to display end of disk (step
S41), and subsequent recording is prohibited (step S42).

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 unless the detector 59 is turned off, each time the record trigger switch 95 is turned on, one image is placed at a different position on the disk 2. A field or one frame worth of signals 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 91 has not yet triggered the trigger at this point.
It is checked whether the switch 95 is turned on (step S43), and if it is not turned on, the process moves to the previous step S39, but if it is turned on, it is further checked whether the detector 59 is turned off. If it is not turned off, wait for a predetermined time Δt to determine the speed or rate for continuous recording (step S45), then return to step S35 and start recording again. trigger. In step S44, the detector 5
9 is off, the controller 91 stops the operation of the camera unit 81 and the synchronizing signal generator 84 and instructs the motor 88 to stop (step S46), as in step S39, and then moves to step S41. do.

When the switch 97 is on, that is, when continuous shooting mode is specified, as long as the recording trigger switch 95 is on, the above-mentioned operation will cause the image to be recorded on the disk 2 at a predetermined speed until the detector 59 turns off. One field or one frame of video signals is continuously recorded at different positions.

Incidentally, the speed or rate of continuous shooting in this case can be arbitrarily changed by making the waiting time Δt in step S45 variable.

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. , the presence or absence of recording is checked 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 the first position where it is determined that there is recording is checked. Since the disc 2 is positioned 1 TP back from the beginning, that is, at the unrecorded position immediately after the last recorded track when counted in the recording track number, the disc 2 is already recorded up to the middle, and the Even if a track has been erased, the head 5 is not positioned with respect to this erased track, and therefore the disadvantages associated with recording on this erased track, e.g. , when moving the head 5 to the next recording position, it is inconvenient that it is necessary to determine the presence or absence of recording at each moving position, and it takes time until the next recording is possible, which reduces the chance of recording. All inconveniences such as data being lost or not being able to perform continuous recording properly can be eliminated.

Furthermore, as shown in Fig. 5, by providing a means for mechanically remembering that the cassette has been replaced (loaded or unloaded), the cassette can be replaced (loaded or unloaded) even when the power is turned off. Since it is possible to know with certainty whether or not the head 5 has been recorded, and to take appropriate measures when recording, there is no need to reset the head 5 to a non-recording device. This avoids the problems of power wastage (this is especially a serious problem in portable devices powered by batteries) and the inconvenience of easily missing recording opportunities (shutdown chances in cameras). This makes it possible to create a rational system.

[About the modified example]

One embodiment of the present invention has been described above. Next, a modification of the above embodiment will be described.

In addition to the above-mentioned modification, the storage means shown in FIG. It may be configured such that loading/unloading of the cassette 1 is detected by detecting opening of the outer cover 35 (ie, the state shown in FIG. 3A). For the former, the opening 31g of the holder 31 may be closed so that the sensing piece 66a of the lever 66 senses the bottom surface of the holder 31, and for the latter, the sensing piece 66a may be configured to detect the bottom surface of the outer cover 35. It may be configured to sense the edge or hook 40 (FIG. 2). However, in either case, the function of the cassette presence/absence detection switch 69 will be impaired, so the switch 69 is made independent from the detection lever 66 and changed to a normally open type switch, and the upper contact piece (69b A state in which a detection pin or the like is fixedly installed in the holder 31 (equivalent to 1) and can be entered into the holder 31 through openings provided on the top plate of the chassis 11 and the bottom surface of the holder 31, and the holder 31 and the outer cover 35 are closed. Only when the cassette 1 is inserted into the holder 31, the pin is pressed and the contact pieces (69b-69a) come into contact with each other, so that the pin is turned on.

Incidentally, in this case, the system controller 9
1 is a control function for recording preparation operation.
It is sufficient to provide a control function as shown in the flow chart in the figure. That is, the operational flow shown in FIG. 10 differs from the operational flow shown in FIG. 8 only in the order of some steps, but the content of each step is the same. Specifically, as shown in the figure, the cassette presence/absence detection switch 69 is checked in step S20, which was performed when the cassette loading/unloading detection switch 70 was not turned on in step S03 in FIG. All that is required is to perform this between checking that the outer cover lock completion detection switch 74 is turned on in step S02 and step S03.

Further, as a further modification of the above-mentioned resetting of the switch operation lever 62, it may be configured to perform this reset independently of the movement of the head 5. Specifically, the fifth
In place of the gear 71 and reset lever 73 shown in FIG. 6, a suction solenoid or a rod protruding plunger is provided facing the tail end 62b of the same lever 62.
Electricity is supplied to these by the controller 91.
For example, by performing this in parallel with step S04 or step S15 in FIGS. 8 and 10, the lever 62 can be reset by rotating clockwise in FIG. 5 by suction by a solenoid or by protrusion of a plunger rod. You should do it.

Furthermore, in the above embodiments and modifications, the recording track numbers on the disk 2 are sequentially numbered from the outer circumference of the disk to the center, but the numbering is conversely done from the center of the disk to the outer circumference. The operation flows shown in FIGS. 8 to 10 may be slightly modified accordingly.

Further, although an example of a still video recording device with an integrated camera unit has been shown above, the camera unit 81 may of course be a separate unit. Furthermore, the power source of the recording apparatus may be of a type that uses a battery, or of a type that uses a commercial power source.

〔effect〕

As described in detail above, according to the present invention, once a record carrier is loaded and a predetermined position is determined, the heads are sequentially moved without determining whether or not there is recording at each recording position on the record carrier. Since the head can be moved in a predetermined direction and positioned at the recordable position, it is possible to immediately have the head standby at the recordable position.

Therefore, without missing the chance to record,
Further, it becomes possible to properly perform continuous recording.

If a recording device using this method is applied to a device such as a still video camera, the above effects can be significantly exhibited.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a record carrier, its holder, and a drive section 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 An exploded perspective view of the disk mounting mechanism;
3A, 3B, and 3C are cross-sectional views taken along the line A-A in FIG. 2, showing various states of the mechanism shown in the second diagram.
FIG. 5 is a detailed plan view showing various states of the cover/lock part in the illustrated mechanism, and FIG. FIG. 6 is a plan view of an embodiment of the present invention, particularly the head moving mechanism; FIG. 7 is a block diagram showing the configuration of an electric circuit system of an embodiment of the present invention; FIG. is a flow chart showing the control flow of the recording preparation operation of the system controller in FIG. 7, FIG. 9 is a flow chart showing the control flow of the recording operation of the system controller, and FIG. 10 is a flow chart showing the control flow of the recording preparation operation of the system controller in FIG. 7 is a flow chart showing a control flow of a recording preparation operation of the system controller in a modified example. DESCRIPTION OF SYMBOLS 1...Magnetic disk cassette, 2...Magnetic disk, 5...Magnetic head, 6...Disk rotating 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, 9
3...Power supply circuit, 94...Power switch, 95...
...Record trigger switch, 97...Mode changeover switch.

Claims (1)

[Scope of Claims] 1. A head positioning method in a recording device in which a record carrier is loaded, the head is moved in a predetermined direction with respect to the loaded record carrier, and recording is performed at each moving position. and detecting loading of the record carrier, and when loading of the record carrier is detected, sequentially detecting each record on the record carrier from a predetermined position on the record carrier in a direction opposite to the predetermined direction. The head is positioned at a position shifted by a predetermined amount in the predetermined direction from the position where the determination was made. Characteristic head positioning method.