JPS6240670A - Head feeding mechanism - Google Patents

Abstract

PURPOSE:To improve the accuracy of the head feeding mechanism by making one attracting action of the plunger into the action of one ratchet gear, converting this into the linear motion of the head through the rotating movement of the sector and sending the head to one track. CONSTITUTION:When a iron core 21 of a plunger 20 is attracted, an arm 22 and a sliding arm 23 are pulled in the direction of an arrow and a ratchet feeding claw 26 sends one gear of a ratchet gear 32. When one ratchet gear is sent, a sector gear 39a meshed at the gear 32a of the same shaft as the gear is operated in the same way, and a sector 39 is rotated in the lower direction with a rotating shaft 39b as a center. A head stand driving pin 39c is rotted in the lower direction in the same manner since it is on the sector 39, pushes an arm 43 of the head stand in the lower direction, a head stand 42 is shifted linearly in the lower direction along guides 46 and 47 and a magnetic head 41 is placed on the next track. Thus, the accuracy of the head feeding mechanism can be improved with a simple mechanism.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a magnetic disk recording/reproducing device using a magnetic disk as an information recording medium. The present invention relates to a head feeding mechanism capable of accurately feeding the head by linearly moving it over a disk by a predetermined distance.

(Prior Art) In recent years, with the progress and development of electronics and solid-state image sensors, a solid-state LFI image element is incorporated into the main body, and an electric signal corresponding to the image information output from the solid-state image sensor is modulated. Magnetic disk recording and reproducing devices that record information on an image recording device and reproduce it as image information as needed have been attracting attention. This magnetic disk recording/reproducing device using solid-state IA image elements is small, lightweight, and consumes little power.

This is because the features of the solid-state Illll image, such as high reliability, long life of 9m, and uniformity, can be utilized to the fullest.

FIG. 8 is a configuration diagram showing a conventional example of a magnetic disk recording/reproducing apparatus using a COD as a solid-state image sensor. In the figure, 61 and 62 are lenses, 63 is an aperture that adjusts the amount of light,
64 is a COD which receives image information from the object OBJ and generates an electric signal according to the amount of received light. For example, a COD having a vertical overflow drain structure is used in order to eliminate blooming and smear phenomena. In this type of COD, by changing the value of the voltage applied to the overflow control gate (OFCG),
Charges generated in the light receiving section can be accumulated or flowed into an overflow drain (OFD). For example, an operation can be performed in which charges accumulated for a certain period of time (charge accumulation time) are transferred to a transfer shift register using a transfer gate pulse, and this operation corresponds to the shutter operation of a camera.

65 is a signal processing circuit that receives the photoelectric conversion signal output from the CCD 64 and performs various signal processing in addition to separating color signals;
66 receives the control signal from the signal processing circuit 65 and controls the aperture 6.
This is an exposure control circuit that provides the optimum aperture amount for 3. 67 is an FM modulation circuit that performs FM modulation of the image signal sent from the signal processing circuit 65; 68 is a magnetic head that records the output of the FM modulation circuit 67 on a magnetic sheet 69; 70 is a synchronization signal generation circuit; 71 is the IB′N signal generation circuit 70
72 is a servo circuit that receives the output of the synchronizing signal generating circuit 70 and provides a rotation signal to the spindle motor 73.

The spindle motor 73 is configured to rotate the magnetic sheet 69. The operation of the magnetic disk recording and reproducing apparatus configured as described above will be explained as follows.

Image information from the subject OBJ is obtained from the lens 61° and aperture 63.
and enters the CCD 64 via the lens 62. CCD
64 accumulates image information corresponding to incident light as electric charge. The accumulated image signals are sequentially output as image signals to the outside by drive pulses sent from the drive circuit 71. The output image signal is separated into three primary colors by a signal processing circuit 65, and the amount of received light is measured. The color-separated image signal is subjected to processing such as combining a luminance signal and a color difference signal, clamping, and gamma correction in a signal processing circuit 65, and then sent to an FM modulation circuit 67 for FM modulation.

On the other hand, the signal processing circuit 65 sends a control signal according to the amount of received light to the exposure control circuit 66, and adjusts the aperture 63 to the optimum aperture amount.

The image signal modulated by the FM modulation circuit 67 is magnetically recorded from a magnetic head 68 onto a magnetic sheet 69 rotating at a constant speed. The image information magnetically recorded in this manner is read out by an image information reproducing circuit (not shown) and reproduced as image information.

By the way, the magnetic sheet 69 described above is detachably attached to the magnetic disk recording/reproducing device, and is installed in the main device when recording or reproducing image information, and can be removed when not needed. Therefore, the magnetic sheet 69 is housed within a jacket to protect the recording surface. Here, concentric tracks are formed on the magnetic sheet 69, and image information is recorded on the tracks. The recording density of such a magnetic sheet 69 is, for example, 25 sheets for a frame image and 5 sheets for a field image.
There are about 0 pieces. In this type of apparatus, when the recording of image information onto one track is completed, the magnetic head is moved to the next track and new 1iIS information is recorded. Since the tracks are arranged concentrically, the head does not move during recording on one track, but
When the recording of the track is finished, it moves to the next track.

This movement is a linear movement of the head from the side of the magnetic disk toward the center, and the movement distance is about 100 μ.

Conventionally, when performing such intermittent feeding, a stepping motor is often used as a driving source. There is also a method that uses a plunger, but in this case, a method is often used in which the reciprocating motion of the plunger is converted by a cam to move the head.

(Problem to be Solved by the Invention) As mentioned above, the track feed of the magnetic head is an intermittent linear motion, and there are methods using a stepping motor and methods using a plunger using a cam. has the following drawbacks: That is, when using a stepping motor, the motor is expensive and the drive circuit is also somewhat more complex than in other systems.

Also, when using a cam in the plunge V method, the feed accuracy is mostly determined by the machining accuracy of the cam, so ±14
In order to keep it within the μ standard, the machining accuracy must be significantly increased to ±1
It is difficult to process because it requires 4μ machining, and it also causes an increase in cost. In either case, a large amount of cost is required, causing an increase in the price of the product.

The present invention has been made in view of these points, and its purpose is to provide a magnetic recording and reproducing device that can obtain accurate feed at low cost and with a simple mechanism and without using high-precision parts. It is about realization.

(Means for Solving the Problems) In order to solve the above problems, the present invention installs a disk-shaped magnetic recording medium in the main body, records image information on tracks formed in concentric circles, and records image information as needed. In the head feeding mechanism of a magnetic information processing device that reads and reproduces image information recorded according to the specified conditions, a head stand whose movement is regulated by a linear guide, and a ratchet gear which is rotatably arranged at the tip of the rotation are used. It consists of a sector that has a gear that meshes with a coaxial gear and a head stand drive member that contacts the head stand in the middle part, and a feed pawl mechanism that advances the ratchet gear by one tooth in response to the suction of the plunger. This is a characteristic feature.

(Function) According to the present invention, one suction operation of the plunger is made into a movement of one tooth of the ratchet m wheel, and the sector gear is pushed through a gear coaxial with the ratchet gear to convert it into rotational movement of the sector. This is converted into a linear motion of the head, and the head is moved one track.

(Example) Examples of the present invention will be described in detail below with reference to FIGS. 1 to 7.

In these figures, 1 is a spindle motor on which a magnetic sheet jacket 4 is placed and rotates a magnetic sheet 2 (described later), 2 is a magnetic sheet inside the magnetic sheet jacket 4, and 3 is a center core of the magnetic sheet jacket 4. , 5 is a magnetic sheet jacket holder. The holder 5 has a mouth shape when viewed from the jacket insertion direction indicated by the white arrow A in FIG. 5, and holds the jacket in the mouth shape.

6 is a forced press-fitting plate that presses the center core 3; 59 is a forced press-fitting plate press-release piece that is formed by bending the other end of the pressing part of the forced press-fitting plate 6 in an inverted shape toward the upper cover 8, which will be described later; This is a pressing piece attached to the tip of the pressing part of the forced press-fitting plate 6. 7 is a pressure spring made of a torsion coil spring that presses the entire magnetic sheet jacket 4, 8 is the upper cover of the magnetic sheet jacket holder 5, and 8a is the cough upper cover 8 when viewed from the direction of Shirakuinhachi in Figure 5. Side plates 9 provided at both ends are pressing members provided at the tip of the upper cover 8. 1o is a set spring 11 that biases the cover 8 and the holder 5 in the opening direction;
12 is an eject spring that ejects the magnetic sheet jacket 4; 12 is a support member that supports the magnetic sheet jacket 5;
13 is a housing to which the support member 12 is attached. 14
15 is an upper cover lock detection switch that detects that the upper cover 8 is locked; 16 is a restriction member for the upper cover 8;
17 is the bottle around which the set spring 10 is wound, and 17 is the pressure spring 7.
It is a bottle wrapped with

20 is a plunger, 21 is an iron core of the plunger 2o, 2
2 is an abbreviated arm pivotally supported by the iron core 21, and 23 is a slide arm that engages with the arm 22. The slide arm 23 is provided with an elongated hole as shown in FIG. 1, and the slide m is
is regulated.

24 is a spring that urges the slide arm 23 in the upward direction in the figure; 25 is an arm that engages with the slide arm 23; 26
27 is a spring that biases the ratchet feeding pawl 26 in the counterclockwise direction; and 28 and 29 are pins that restrict the movement of the ratchet feeding pawl 26.

32 is a ratchet gear, 30 is a stopper that prevents the ratchet gear 32 from rotating in the opposite direction, and 31 is the stopper 30.
32a and 33 are gears provided coaxially with the ratchet gear 32; 34 is a gear that meshes with the gear 33; 35 is a gear that meshes with the gear 34; 36 is magnetic sheet jacket 4
It is a rotating shaft that fits into a counter (not shown) attached to the machine, and a positioning pawl 36a is attached to the tip of the rotating shaft. 3
7.38 is an erroneous recording prevention mechanism. Similar to a cassette tape, the side surface of the magnetic sheet jacket 4 is provided with a claw for preventing erroneous recording, and when this claw is broken, the recorded image information is prevented from being erased without entering the recording state.

39 is a sector, 39a is a gear formed at one end of the sector 39, 39b is a rotating shaft, and 39c is a head stand drive bin provided in a part of the sector 39.

The sector 39 is configured to be rotatable around a rotating shaft 39b, and in terms of installation, the sector 39 rotates when the gear 39a and the gear 32a mesh with each other.

40 is a return spring that urges the sector 39 upward in FIGS. 1 and 2; 41 is a magnetic head; 42 is the magnetic head 4;
1, 43 is a head stand drive bin 39c.
This is the arm that comes into contact with the 46.47 is a guide for guiding the head stand 42 in the vertical direction in FIGS. 1 and 2; 48.
Reference numeral 49 denotes a spring that urges the head stand 42 upward in FIGS. 11 and 2 to bring the arm 43 attached to the head stand 42 into contact with the head stand drive bin 39c attached to the sector 39. be. In addition to this, the springs 48 and 49 also move the magnetic head 41 to the initial position of the magnetic track (
It also has a function to return to 0 track).

Reference numeral 50 denotes a lever (see FIG. 2), which is biased in the direction of the arrow by a spring 51. Therefore, when the tip of the lever 50 is not restrained, the stopper 30 engaged with the lever 50 is configured such that the pawl at the tip of the stopper 30 is disengaged from the ratchet gear 32.

Reference numeral 52 denotes an adjustment screw which also serves as a stopper for regulating the upper end of the sector 39 when it is in the released state as shown in FIG. 2, and is adapted to adjust the MlIiIJ position of the sector 39. . 55 is a movable member fitted into the holding member 56 (see FIG. 5); 57 is the holding member 5;
A spring 58 is pushed into the movable member 55 to urge the movable member 55 upward in the drawing, and a jacket detection switch whose contact point is closed when pushed by the bottom 55a of the movable member 55.

The holding member 56 is attached to the housing 13. The jacket detection switch 58 also serves as a detection switch for an erroneous recording prevention claw. When the boulder 5 is closed as shown in FIG. 7, the movable member 55 is pushed by the holder 5, and the contact of the jacket detection switch 58 is turned on.

Next, the overall operation of the mechanism section configured as described above will be explained.

FIG. 1 shows the state in which the magnetic head is in the middle of being fed. Before suction of plunger 20, ratchet feed pawl 26
is in the position shown in FIG. 2, and the suction of the plunger 20 pulls the iron core 21 in the direction of the arrow as shown in FIG. 1, causing the arm 22. The slide arm 23 and the arm 25 operate, the ratchet feed pawl 26 moves to the position of the pin 29 adjusted to feed the ratchet gear 32 by one tooth, the ratchet 1lli32 is fed by one tooth, and the stopper 30 is moved.
It is held at the position shifted by one tooth. At this time, the sector gear 39a meshing with the gear of the @wheel 32a coaxial with the ratchet gear 32 also rotates. Since the arm 43 of the head stand 42 is pressed by springs 48 and 49 to the head stand drive bin 39c, which is attached to a position where it moves approximately 100 μ with the rotation of one ratchet tooth, the head stand 42
along the guides 46 and 47, and the corresponding head stand drive bin 3
It moves by the same amount as the linear movement affi of 9C. As a result, the magnetic head 41 moves to the next track position on the magnetic sheet 2. Such head feeding is performed when the magnetic sheet jacket is attached as shown in FIG. That is, when the mechanism is in the eject state as shown in FIG. 5, the mechanism is as shown in FIG. 32, and the ratchet feed pawl 26 is removed from the ratchet gear 32.
Even if the ratchet moves toward In!, it will not reach the ratchet gear 32 because it is located far from the bin 29, and the ratchet In!
Never send 32 teeth. At this time, ratchet gear 3
2 is away from the restriction of the stopper 30, so the return spring 4
The sector 39 pulled with zero force returns it via the gear 32a to the initial position set by the adjusting screw 52.

Next, the operation of the head feeding mechanism according to the present invention will be explained in detail. When the magnetic sheet jacket 4 is attached to the holder 5, the upper cover 8 is open and the side plate 8a is not lowered, so that the engagement with the tip of the lever 50 in FIG. 2 is released.

Therefore, the lever 50 moves clockwise due to the biasing force of the spring 51, causing the stopper 30 to disengage from the ratchet gear 32. Therefore, the ratchet gear 32 is in sector l! ! I$
It is rotated by the return spring 40 of l39a and returned to the initial position of the sector, and the head stand 42 is also in the o-track position by the springs 48 and 49. When the holder 5 is closed as shown in FIG. 7, the side kFi 8a is lowered and the lever 50
The stopper 30 is engaged with the tip of the stopper 30 and
engages ratchet gear 32. When one track of recording is completed, the plunger 20 operates to suck the iron core 21. The time relationship between the two may be regulated by, for example, a clock pulse having a pulse interval corresponding to the number of rotations of the magnetic sheet 2 by the spindle motor 1. When the iron core 21 is attracted, the arm 22. The slat arm 23 is pulled in the direction of the arrow, and the ratchet feed pawl 26 is moved to the ratchet gear 32.
This will move the tooth of 1 tooth forward. When the ratchet gear is advanced by one tooth, the sector gear 39a meshing with the gear 32a coaxial with the ratchet gear moves in the same way, and the sector 39 has three rotating shafts b.
Rotate downward around the center. Head stand drive bin 39c
As shown in Fig. 1, since it is located three sectors above, it rotates downward in the same way, pushing the arm 43 of the head stand downward, and the head stand 42 moves linearly downward along the guides 46° and 47. Then, the magnetic head 41 is placed on the next track.

The above is the operation of the head drive mechanism according to the present invention. Next, the accuracy thereof will be discussed.

In FIG. 3(a), one suction of the plunger 20 moves the ratchet #ji wheel 32 by 1 m. The ratchet teeth *32 have 60 teeth on the entire circumference, so the angle per tooth is 61. On the other hand, a gear 32a coaxial with the ratchet tooth $32 and a sector gear 39a mesh with each other, and the reduction ratio is 10826. Therefore, the rotation angle of the sector gear 39a is θ 1 to θ − 6° X (6/1 08) − (1/3)
In order to obtain a movement of the head stand of 100μ (Q, 1nua) with this rotation angle of ``-20', / sin θ = 0.1 (ml!!-0,1/sin 20' -17,19( mat
).

However, the rotational motion is converted to linear motion/C.
As the angle of inclination of the sector 39 increases, an error occurs and the movement of the head stand 42 is no longer 0.1 mm.

In FIG. 3(b), A, B.

C is the position of the head stand drive bin 39c at the inclination of each sector, A is the reference position, and B is α.

When tilted downward, C is the position of the head stand drive bin 39c when it advances one track further. In this diagram,
θ is 20', BC is Q, 1mm, but the head stand 4
Movement 2 becomes BD and causes an error.

This value becomes a cumulative value as the angle increases. Figure 4 shows the error curve. (a) is 7-17.
The maximum error in the error curve at 191- is ±8.6μ, which is within the tolerance of ±14μ, but at 1-17.25m.
If m is selected, the curve becomes <b), and the error is ±2.6μ, further improving accuracy.

In reality, it is necessary to consider the error in setting the distance between the rotating shaft 39b and the head stand drive bin 3'9C, but it is /-17,25m.
It has been found that the error is within ±5 μm when the setting error is +0.01u+ to −0.03 nm. In order to keep the error within ±5μ when using a cam, the cam's machining accuracy must be kept within 5μ, which is difficult. In the head stand drive structure of the present invention, which converts the rotational movement into linear movement of the head stand, highly accurate head feeding can be realized with a relatively simple mechanism and without using particularly high precision parts. In the above explanation, numerical values such as the distance between the rotating shaft of the gear (1 gear tooth) and the head stand driving bin are limited, but it is needless to say that the numerical values are not limited to these values. In the present invention, the rotation of the sector due to rotation and the accompanying linear movement of the head stand are all within the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, a head feeding mechanism with a good 111 degrees can be obtained with a simple mechanism and without using particularly high-precision parts.

[Brief explanation of drawings]

1 and 2 are mechanical configuration diagrams of the head carriage transport mechanism according to the present invention, Figure 3 is a diagram showing factors for numerical calculation of the head carriage transport mechanism, and Figure 4 is a diagram showing the error curve of the same mechanism, 5 to 7 are mechanical configuration diagrams of an embodiment of the magnetic sheet jacket mounting device, and FIG. 8 is a configuration diagram showing the electrical system of the magnetic recording/reproducing device. 1.73... Spindle motor 2.69... Magnetic sheet 3... Center core 4.
...Magnetic sheet jacket 5...Holder 6...Forced press-fit plate 7...
・Press spring 8...Top cover 9...Press member 10...Set spring 11...Eject spring 12...Support member 13...Casing
14...Regulation member 15...Top cover lock detection switch 16.17.28.29...Bin 20...Plunger 21...Iron core 22.25
...Arm 23...Slide arm 24.27
．． 31, 40.45.48.49゜51.57... Spring 26... Ratchet feed pawl 30... Stopper 32... Ratchet gear 32a, 33.34.35... Gear 41...・Head 42...Head stand 43...Arm
46.47...Guide 50...Lever
52... Adjustment screw 55... Movable member 5
6...Holding member 58...Jacket detection switch 59...Forced press-fit plate press release piece 60...Forced press-fit plate press piece Patent applicant Roku Konishi Photo Industry Co., Ltd. Representative Patent attorney Toji Ijima 1
Name ■O to■0OP-hemmnogunn00 Fnoku■no0 I■■O (p, 1nLn[F]

Claims (1)

[Claims] In a head feeding mechanism of a magnetic information processing device that has a disk-shaped magnetic recording medium installed in the main body, records image information on concentric tracks, and reads and reproduces the recorded image information as necessary. , has a head stand whose movement is regulated by a linear guide, and a gear that is rotatably arranged and meshes with a ratchet gear and a coaxial gear at the rotating tip,
A head feeding mechanism comprising: a sector having a head stand driving member in contact with the head stand at an intermediate portion; and a feed pawl mechanism that advances a ratchet gear by one tooth in response to suction of a plunger.