JPS63291275A - Head access mechanism - Google Patents

Abstract

PURPOSE:To protect a disk and a magnetic head by acting the energy of a first elastic member to the head with the aid of a driving means and acting the energy of a second elastic member to the head wit the aid of the non- operation of the driving means or the reverse driving of it. CONSTITUTION:A coil spring 21 is stretched between a spring hanging part 13a provided with a driving lever 13 and a spring hanging part 115 provided with a chassis 1. By the stretching power of this spring, the driving lever 13 is abutted on a head carriage 2 and energized in the direction of depressing the carriage 2. Then, when a head access instruction is cancelled and the electrification to a solenoid 41 is interrupted, the holding by the solenoid 41 is gone and the driving lever is rotated by the energizing force of the spring 21. Besides, the energizing force of the spring 21 acts the head carriage 2. Therefore the lever 13 depresses the head carriage 2 until a stopper 13b abuts on the chassis 1 and turns it. Accompanied with that, the magnetic head 50 is separated to a shunting position which is distant from the disk. Thus the disk and the head can be protected.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a head access method for moving a recording or reproducing head toward or away from a disc in a disc recording/reproducing apparatus that records or reproduces information on a disc as a rotating recording medium. It is about the mechanism.

[Prior Art] As the above-mentioned disk recording and reproducing device, there is a floppy disk drive M (hereinafter referred to as FD) which records or reproduces information on, for example, a floppy disk as a rotating magnetic recording medium.
FDDs (referred to as D) are equipped with the above-mentioned head access mechanism, which brings the magnetic head close to the disk during recording and reproduction, and moves it to the recording and reproduction position where it can come into contact with the disk and perform recording and reproduction. be done. Further, when the disk is loaded into the recording/reproducing position and when the disk is ejected, the magnetic head is moved to a retracted position away from the disk by driving the head access mechanism.

The head access mechanism of the FDD is configured using a lens or the like as a driving source. When the magnetic head is brought closer to the disk (hereinafter referred to as head access time), the magnetic head is brought closer to the disk by the force generated by the drive source.

[Problems to be Solved by the Invention] By the way, if an FDD is left in the recording or reproducing state, the same track will continue to come into sliding contact with the magnetic head, which poses a problem in the durability of the disk. In reality, continuous sliding contact with the same track can last for more than 100 hours without any problem, but in FDD, a time limit is generally set for this, and the time limit is set to about 30 minutes. When the continuous sliding contact of the same track exceeds a time limit, the rotation of the disk is stopped and so-called autoshaft-off is performed, such as separating the pad that presses the disk against the magnetic head with an air film from the disk.

When this auto-shutoff is performed, the magnetic head remains at the recording/reproducing position and remains in contact with the disk. Also, during recording and playback, the FDD
Even if the power is turned off, the magnetic head remains in contact with the disk.

However, if the magnetic head remains in contact with the disk for a certain period of time, the disk will become deformed, and if a deformed disk is used for recording and playback, signal dropouts may occur. There have been problems such as the magnetic material portion of the disk being scratched by the head and being damaged, and furthermore, the magnetic head being damaged by the scraped magnetic material portion.

To address this problem, some conventional hard disk drives have adopted a configuration in which the magnetic head is automatically moved to a retracted position away from the disk when the power to the drive is cut off or when the auto shaft is turned off.

However, the conventional head access mechanism having such a function has a problem that the structure is complicated and the cost is high.

On the other hand, in a conventional head access mechanism, the biasing force of the head during head access is adjusted by adjusting the positional relationship between a drive means such as a solenoid and an operating member operated by the drive means.

However, this adjustment is difficult, and the manufacturing cost increases accordingly.

[Means for Solving the Problems] In order to solve these problems, according to the present invention, a second elastic member that brings the recording or reproducing head closer to the recording medium, and a second elastic member that approaches the recording medium or the reproducing head; A drive means is provided for selectively applying a biasing force of an elastic member to the head, and the biasing force of the first elastic member is applied to the head by the operation of the drive means, so that the drive means does not operate or moves in the opposite direction. The second elastic member is configured to apply a biasing force to the head by driving the head.

[Function 1] According to such a configuration, the urging force of the first elastic member is applied by the driving of the driving means, and the head approaches the disk. Furthermore, when the driving means is powered off or driven in the opposite direction, the biasing force of the second elastic member acts, and the head is separated from the disk.

In this way, not only can the head approach and move away from the disk, which is normally done in a disk recording/reproducing device, but also when the power to the device is cut off, the power to the drive means is also cut off, so the head can be automatically moved away from the disk. be done. Even during auto-shutoff, the head is separated from the disk by cutting off the power to the drive means or driving it in the opposite direction to the direction in which it approached.

Further, according to the above configuration, the urging force of the head during head access is determined by the first elastic member, and by managing the characteristics of the first elastic member, adjustment of the urging force becomes unnecessary.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

1 above 111 fjS1 Figures (A), (B) to Figures 3 (A) to (C) explain the structure and operation of the main parts of an FDD equipped with a head access mechanism according to the first embodiment of the present invention. It is.

In FIG. 1(A) and FIG. 2, reference numeral 1 denotes a chassis, which is attached to the not-shown body frame of the FDD at surfaces 102 to 104. Further, on the upper surface of the chassis l, three wooden columnar supports 107 to 109 are protruded, and disk cassettes containing floppy disks (not shown) are mounted on the members 107 to 109, and two The two receivers are positioned via positioning pins 105 and 106 provided on the upper surfaces of members 107 and 108.

The chassis 1 is also a housing for a spindle motor 60 that rotates the disk, and the spindle motor 60 is installed by fitting and fixing a bearing into a hole 101 formed in the center of the chassis 1.

In addition, a head window 11 is located near the hole 101 in the chassis 1.
6 is formed, and a magnetic head 50 is movably provided facing the window 1B from below.

During recording and reproduction, an air film (not shown) is generated through pads (not shown) that are received through bottles 117 to 119 protruding around the head window 116, and the magnetic field inside the head window 116 is moved. It is adapted to be pressed into contact with the head 50.

On the other hand, the magnetic head 50 is provided on the head carriage 2 via the helad base 3. That is, the magnetic helad 50 is fixed to the bent portion 3b of the helad base 3 with screws, and the head base 3 is fixed to the head carriage 2 with screws via a spring washer. In this case, the head base 3 is positioned on the helad carriage 2 by fitting the concave portion on the lower surface side of the bent portion 3d formed on the head base 3 into the convex portion 2d formed on the head carriage 2. Further, the inclination of the head base 3 can be adjusted by adjusting the tightening of the screws that fix the head base 3 to the head carriage 2, so that the inclination of the magnetic head 50 can be adjusted. Also, the glue wire for inputting and outputting signals of the magnetic helad 50 is connected to the bent portion 3C provided on the helad base 3.
It is designed to be fixed via.

On the other hand, the helad carriage 2 is fixed to the metal 4 by screwing the metal presser 5 with the bent parts 2a and 2b in contact with the cylindrical metal 4 that is slidably fitted onto the shaft 16. . Then, by bringing both ends of the shaft 16 into contact with fixing surfaces 111 and 113 formed on the chassis 1 and fixing the shaft holder 17 with screws, the head carriage 2 is attached to the shaft 16 on the lower surface side of the chassis 1. It is provided so as to be slidable through the metal 4. Further, the head carriage 2 is rotatably provided around a shaft 16 as a rotation center. However, the rotational limit of the head carriage 2 is restricted by the shaft 15 which is fixed with both ends abutting against fixing surfaces 112, 112 formed on the chassis 1. The rotation limit is adjusted via a head screw 7 screwed into the head carriage 2 so as to be able to abut against the shaft 15, so that the amount of protrusion of the magnetic head 50 can be adjusted.

Further, a cam pin 6 is installed at the right end of the head carriage 2 in FIG. And this cam pin 6
between the spring hooking portion 2C provided on the head carriage 2 and the spring hooking portion 114 provided on the chassis 1 so as to be in pressure contact with the cam portion 9a of the cam 9 for moving the head carriage 2, as will be described later. The head carriage 2 is urged in the direction toward the cam 9 by a carriage spring 22 stretched over the cam 9 .

By the way, as described above, by rotating the head carriage 2, which is rotatably provided around the shaft 16, the magnetic head 50 is moved toward or away from the disk. Further, by moving the head carriage 2 in a reciprocating direction along the shaft 16, the magnetic head 50 is sent along the radial direction of the disk. Below is Magnetic Herad 5
The details of the head access mechanism and head feeding mechanism for approaching and separating 0 will be explained.

First, the structure of the head access mechanism is shown by reference numeral 8 in Figure 2.
The one shown is a head load spring consisting of a leaf spring,
It is screwed to the chassis l.

The head load spring 8 comes into contact with the lower surface of the left end of the helad carriage 2 in FIG. It has become.

Further, a drive lever 13 is provided as a drive member that transmits a force that pushes down the left end of the head carriage 2 in FIG. 2 and urges the magnetic head 50 away from the disk. The drive lever 13 is attached to the chassis 1 via a lever holder 14 (see Fig. 1(B) and Fig. 3(B)).
), (C)) is provided facing above the left end of the head carriage 2 and rotatable about a shaft 13e.

A spring (coil spring) 21 is stretched between the spring hook 13a provided on the drive lever 13 and the spring hook 115 provided on the chassis l, and the tensile force of the spring 21 causes the drive lever 13 to slide into the lever. It comes into contact with carriage 2,
This is biased in the direction of pushing it down.

Note that the spring force of the spring 21 is set to be larger than that of the Herad load spring 8.

Further, an engaging portion 13d is provided at the rear end of the drive lever 13, and a plunger 42 of a solenoid 41 fixed to the chassis l is engaged with and rotatably coupled to the engaging portion 13d. . The solenoid 41 composed of an electromagnet is of a conventional type that generates a force to attract the plunger 42 only while energized. By driving the solenoid 41, the drive lever 13 is rotated in a direction away from the head carriage 2 against the urging force of the spring 21.

As shown in FIG. 3(A), the drive lever 13 is provided with a stopper 13b that comes into contact with the chassis 1 to restrict the rotation limit of the drive lever 13.

Further, as shown in FIG. 3(B), there is a hemispherical projection 1 on the lower surface of the tip of the drive lever 13 that comes into contact with the head carriage 2.
3c is provided protrudingly.

Next, the structure of the head feeding mechanism will be explained.

First, in FIGS. 1(A) and 2, reference numeral 30 is a stepping motor as a drive source for the head feeding mechanism, and its output shaft is inserted into a hole 110 formed in the chassis 1 and fixed to the chassis with screws. be done. The rotational driving force of the stepping motor 30 is decelerated through a gear 11 fixed to the output shaft of the stepping motor 30 and gears 12A and 12B coaxially supported on the shaft 10A on the chassis 1, and then applied to the cam 9.
It is intended to be transmitted to

The cam 9 is rotatably supported on the chassis l by a shaft 10B. A gear portion 9b that meshes with the gear 12B is formed on the outer periphery of the cam 9.

A cam portion 9a is provided protruding from the lower surface of the cam 9.

As described above, the cam pin 6 of the helad carriage 2 is pressed against the outer circumferential surface of the cam portion 9a by the urging force of the carriage spring 22. Also, a cam spring 90 is stretched between the spring hook 9C provided on the cam 9 and the spring hook 120 provided on the chassis 1, and the cam 9 is moved by the tensile force of the spring hook 9C as shown in FIG. 1(A). direction. This biasing force eliminates backlash in the gear train from the gear 11 to the gear portion 9b of the cam 9. Further, a dowel portion 9d is provided on the upper surface of the cam 9 in a protruding manner for detecting the outermost track 00 of the disk, as will be described later.

With such a structure, the cam 9 is rotationally driven in the clockwise or counterclockwise direction in FIG. 1 by the driving of the stepping motor 30, so that the shaft 10B,
The distance between the cam bins 6 changes. In response to this change, the head carriage 2 is moved due to the pressing force of the cam portion 9a pressing the cam pin 6 or the tensile force of the carriage spring 22.
16 in the downward or upward direction in FIG. 1(A). This movement causes the magnetic head 50 to be sent along the radial direction of the disk. By rotating the cam 9 through an angle of approximately 300 degrees, the s1 disk 50 is fed by an amount that covers the entire recording area of the disk.

The entire cam 9 shall be integrally molded from resin, and in this case, in order to make the environmental characteristics of the head feeding system and the disk almost equal, the resin used is wholly aromatic polyester, a type of liquid crystal polymer. shall be used. The linear expansion coefficient of liquid crystal polymer is approximately θ~3×10″6c layer/C
■/°C, and it is possible to obtain a value equivalent to that of metals. Conventionally used resins have linear expansion coefficients of 6 to 10XIO4c layers/el+/"0, and to achieve a linear expansion coefficient comparable to that of metals, it is necessary to mix glass fibers. However, mixing glass TA fibers is necessary. Then, the cam pin 6 that slides on the cam portion 9a is scraped, and the track position of the magnetic head 50 is shifted.By integrally molding the cam 9 from liquid crystal polymer as described above, the track position of the magnetic head 50 can be adjusted. can be determined accurately.

Conventional resins usually have a linear expansion coefficient of 6 to 10X 10
-cm/cm/"0, in order to achieve a linear expansion coefficient comparable to that of metal, it is necessary to lower the linear expansion coefficient by mixing glass fiber, etc., but in this case, in this embodiment, the cam portion 9a Since the cam pin 6 of the helad carriage slides, the cam pin 6 is dislodged, causing the head to be misaligned in its track position.

In this regard, if a liquid crystal polymer is used, it is possible to lower the coefficient of linear expansion by itself, and if it becomes necessary to vary the desired coefficient of linear expansion, coefficient of friction, shrinkage rate 1 strength during molding, etc. depending on the usage conditions. Even without mixing glass fiber,
Desired properties can be obtained by incorporating carbon fiber, graphite, minerals, etc.

Furthermore, this material has good mold transfer accuracy and can fully achieve the accuracy of ±5 gm required for the cam, making it possible to obtain an accuracy comparable to that of a metal cam.

Therefore, according to the cam 9 to which the present invention is applied.

Since there is no glass fiber mixed in, the cam pin 6 that comes into sliding contact with the cam surface 9a will not be scraped, and there is no risk of head mistracking.

Next, in connection with the above-mentioned head feeding mechanism, the structure of a track 00 detection mechanism for detecting that the track position of the magnetic head is at the outermost track 00 of the disk will be described.

As for the structure of the detection mechanism, first, in FIGS. 1A and 2, reference numeral 1.8 is a switch base, which is fixed on the chassis 1 with screws.

A leaf switch 40 for detecting track 00 is fixed on the center of the switch base 18 with screws. Further, a lever 19 for operating a leaf switch 40 is rotatably provided on the switch base 18 via a bin 20. However, the rotation range of the lever 19 is restricted by bent portions 18a and 18b formed on the switch base 18. Further, one end of the lever 19 is placed at a position where it can engage with the dowel portion 9d of the cam 9, and the other end of the lever 19 is arranged so as to be able to operate the leaf switch 4°.

With this structure, the detection operation is performed as follows. When sending the Rad 50 to the 81st direction towards the outer circumference of the disk,
The cam 9 is rotated clockwise in FIG. When the track position of the magnetic helad 50 is near the track 00, the dowel portion 9d, which rotates as the cam 9 rotates, contacts the lever 19 and rotates it counterclockwise in FIG. 1. Then, the lever 19 hits the leaf switch 40, and the truck 00 is detected based on the resulting output signal of the leaf switch 40.

Na13 S4-/f Heath 181*Length 1418c
, 18d to the chassis l with screws, and the fixing position can be adjusted via long grooves 18c and 18d. By adjusting the fixed position of the switch base 18, the timing at which the lever 19 operates the leaf switch 40 can be adjusted.

Further, the lever 19 operated by the dowel portion 9d of the cam 9 is the bent portion 18a of the switch base 18.

Since the rotation range is restricted by 18b, the rotation range of the cam 9 is mechanically restricted. For this reason, the movement range of the Herad carriage 2 is also restricted within a predetermined range. Since the head carriage 2 only elastically contacts the cam portion 9a of the cam 9 at the cam pin 6, there will be no damage to the head carriage 2 even if the FDD system controller goes out of control. It is designed so that it will not be affected.

Next, the overall operation of the FDD having the above structure will be explained.

First, when no disk cassette is loaded in the FDD, the head access mechanism is in the state shown in FIGS. 3(A) and 3(B).

In other words, power to the solenoid 41 is cut off.

The solenoid 41 does not generate any tensile force, and as described above, due to the biasing force of the spring 21 which is greater than the head load spring 8, the drive lever 13 moves clockwise in the middle of FIG. 3(B) until the stopper 13b comes into contact with the chassis l. It has been rotated to. The head carriage 2 is in a state of being pressed and rotated downward in the figure, and the magnetic head 50 is in a state of being separated to a lower retracted position away from a recording/reproducing position where it can contact the disk.

Next, when the disk cassette is inserted into the FDD and mounted at a recording/reproducing position by a loading mechanism (not shown), it is detected by a detecting means (not shown) and 2 recording or reproducing modes are selected. Then, a head access command is generated from the FDD system controller, and the solenoid 41
is energized.

The energized solenoid 41 pulls the drive lever 13,
As shown in FIG. 3(C), the lever 13 is rotated counterclockwise in the figure against the biasing force of the spring 21. The lever 13 is then held in this position. As a result, the urging force of the spring 21 no longer acts on the head carriage 2, and the head carriage 2 is rotated upward by the urging force of the head load spring 8, and the magnetic head 50 is moved to the recording/reproducing position where it contacts the disk. .

Note that after pulling the lever 13 to rotate it to the position shown in FIG. 3(C), the current flowing through the solenoid 41a when the lever 13 is held at that position is made smaller than when the lever 13 is rotated, so that heat generation of the solenoid 41 is suppressed. It has become.

On the other hand, when the disk cassette is installed, an initialization command is issued from the system controller, and the track position of the magnetic head 50 is first set to track 0 on the outermost circumference of the disk.
0, the stepping motor 30 is driven, for example, by two-phase excitation, and the magnetic head 50 is sent toward the outer circumference of the disk. For example, the track pitch of a disc is 100.
71 m, and assuming that the magnetic head 50 is moved 10 JLm by driving the stepping motor 30 in one step, the head is moved by one track in 10 steps.

When the magnetic head 50 is sent to the vicinity of the track OO,
As mentioned earlier, the dowel 9d of the cam 9 operates the lever 19,
Turn on the leaf switch 40. After turning on, the stepping motor 30 is further driven one step, then reversely driven to begin sending the magnetic head in the inner circumferential direction, and when a predetermined excitation phase is reached, the stepping motor 30 is stopped at the current position at track 00. The reason why the one-step drive described above is performed here is to refresh the contacts of the leaf switch 40.

After positioning the magnetic head 50 at track 00 in this way, the magnetic head is sent in the inner circumferential direction to search for the usage state of the disk to find out which part of the disk is being used for recording. information is stored in memory used by the system controller.

After that, recording or playback is performed based on the above usage status information in response to a command from the host system,
Alternatively, recording or reproduction may be performed based on information in each individual's memory map.

Next, when recording and reproduction are completed and the disk cassette is ejected, the head access command is canceled and the power supply to the solenoid 41 is cut off. As the holding by the solenoid 41 is removed, the drive lever 13 is rotated by the biasing force of the spring 21 from the position shown in FIG. 3(C) to the position shown in FIG. 3(B). It acts on the rad carriage 2. As described above, since the urging force of the spring 21 is greater than that of the head load spring 8, the lever 13 pushes down the head carriage 2 until the stopper 13b comes into contact with the chassis 1, causing the head carriage 2 to rotate. Along with this, the magnetic disk 50 is moved away to a retracted position away from the disk.

This makes it possible to eject without any trouble.

By the way, during recording or playback on this FDD, the FDD may fail due to a power outage or the power cord being hooked.
When the power to the DD is cut off, the power to the solenoid 41 is naturally cut off due to the power cut off, so the magnetic head 50 is moved away from the disk to the retracted position in exactly the same way as in the eject case described above. be done.

Also, when performing the above-mentioned auto shaft off, the magnetic head 50 is separated from the disk by cutting off the power to the solenoid 41.

As described above, according to this embodiment, the magnetic head is automatically separated from the disk when the power is cut off during recording or reproduction and when the auto shaft is turned off.

Deformation of the disk can be prevented, and damage to the magnetic head caused by the aforementioned damage to the disk due to the deformation can be prevented.

Further, according to this embodiment, the head access mechanism can be constructed easily and inexpensively with a small number of parts as described above.

Furthermore, according to this embodiment, the biasing force that brings the magnetic head load spring 50 closer to the disk is the bias force of the head load spring 8, and can be easily determined to an appropriate magnitude by managing the characteristics of the head load spring 8.

In the assembly process, it is no longer necessary to adjust the biasing force, which is difficult in the past, and the assembly cost can be reduced accordingly.

In the above structure, the solenoid 41 latches the plunger 42 at the driven position by energizing it for a predetermined period of time, and drives the plunger 42 in the opposite direction by energizing it in the opposite direction. A self-holding solenoid that is latched may be used. In this case, it is only necessary to energize in the forward direction and in the reverse direction for a predetermined time each time the head is accessed or separated, which greatly reduces power consumption. The heat generation of the solenoid 41 can also be suppressed. However, in this case F
Even when the power to the DD is cut off, it is necessary to energize the solenoid 41 in the opposite direction for a predetermined period of time. This may be configured using a backup power source, a capacitor, or the like.

Next, FIGS. 4A to 4C illustrate the structure and operation of an FDD head access mechanism according to a second embodiment of the present invention. In these figures, parts common to those in FIGS. 1 to 3 (A) to (C) of the first embodiment are designated by the same reference numerals, and their explanations will be omitted.

The structure shown in FIGS. 4(A) to 4(C) differs from the first embodiment in the arrangement of the spring that biases the magnetic head in the direction toward the disk and the spring that biases the magnetic head in the direction away from the disk. There is.

That is, first, the spring that biases the magnetic head in the direction toward the disk is a leaf spring 63, whose base end is the tip of the drive lever 62, which is a drive member corresponding to the drive lever 13 of the first embodiment. The distal end portion is arranged so as to be able to come into contact with the lower surface of the helad carriage 2.

The drive lever 62 is connected to the chassis 1 via the lever holder 14.
The plunger 42 of the solenoid 41 is coupled to a retaining portion formed at the rear end. Further, a stopper 62a is formed at the tip of the lever 62, and a stopper 62a is formed at the tip of the lever 62 so as to come into contact with the chassis 1 and
Figures (B) and (C) The limit of rotation in the clockwise direction is restricted.

The spring that biases the magnetic head in the direction away from the disk is a leaf spring 61 whose base end is fixed to the upper surface of the carriage 2 and whose tip end is arranged so that it can come into contact with the shaft 15. has been done. Note that the spring force of the plate spring 61 is set smaller than the spring force of the plate spring 63.

As the solenoid 41, a normal type solenoid that sucks the plunger 42 only while energized as described above may be used, or a self-holding type solenoid may be used.

With this structure, when the head is accessed, the solenoid 41 is energized as in the first embodiment (in the case of a self-holding type, energization is performed in the positive direction for a predetermined time), and the plunger 42 is pulled. This causes the drive lever 62 to move as shown in FIG. 4(A).

(B) It is rotated in the middle clockwise direction, and as shown in both figures, the leaf spring 63 presses the head carriage 2, and the head carriage 2 moves upward against the biasing force of the leaf spring 61, which is smaller than the leaf spring 63. Rotate. Along with this, the magnetic head 50 is moved to a recording/reproducing position where it comes into contact with a disk (not shown).

On the other hand, when recording/reproduction is completed and the disc is not ejected, at auto-shutoff, or when the FDD power is turned off, the energization of the solenoid 41 is cut off as in the first embodiment (in the case of a self-holding type, the solenoid 41 is de-energized). The attraction force of the plunger 42 is deenergized, and the spring force of the leaf springs 61 and 63 (in the case of a self-holding type, in addition to that, the driving force of the solenoid 41 in the reverse direction) is deenergized. As a result, the drive lever 62 moves clockwise in the middle direction as shown in FIGS. 4(B) and 4(C).
The stopper 62a is rotated until it comes into contact with the chassis l. Along with this, the magnetic disk 50 is moved to a lower retracted position away from the disk.

The present embodiment as described above also provides the same effects as those of the first embodiment.

In addition, in the above structure, by configuring the leaf spring 63 integrally with the drive lever 62, the number of parts can be further reduced, the structure can be simplified, and it can be constructed at low cost.

Further, in the first embodiment and the second embodiment, the head 0-t/
<The spring 9 and the plate spring 61 can be replaced by a torsion spring supported by the shaft 16. Of course, the type of elastic member that biases the head in this way is not particularly limited.

Furthermore, the structure of the head access mechanism described above can be used not only for FDDs but also for other disk recording and reproducing devices.

[Effects of the Invention] As is clear from the above description, according to the present invention, the second elastic member that brings the recording or reproducing head closer to the recording medium, and the biasing force of the first or second elastic member. and a driving means for selectively acting on the head, and the urging force of the first elastic member is applied to the head by the operation of the driving means.

Since the structure is configured such that the biasing force of the second elastic member is applied to the head when the driving means is not operated or driven in the opposite direction, the head is automatically activated when the power is cut off or when the disk recording/reproducing apparatus is turned off or automatically shut off. To easily and inexpensively construct a head access mechanism that can protect the disk and head by separating the disk from the disk. Further, excellent effects such as eliminating the need to adjust the biasing force that brings the head closer to the disk during the assembly process can be obtained.

[Brief explanation of the drawing]

FIG. 1(A) is a plan view showing the main structure of an FDD equipped with a head access mechanism according to the first embodiment of the present invention in a transparent state, and FIG. 1(B) is a drive shown in FIG. 1(A). A plan view showing details around the lever, Fig. 2 is an exploded perspective view showing the main structure of the same FDD, and Figs. 3 (A) to (C) respectively show the same FDD.
An explanatory diagram of the structure and operation of the head access mechanism, Fig. 4 (
A) to (C) are explanatory diagrams of the structure and operation of a head access mechanism according to a second embodiment of the present invention, respectively. 1... Chassis 2... Head carriage 8
...Head load spring 13.82...Drive lever

Claims (1)

[Claims] A head access mechanism for moving a recording or reproducing head toward or away from a recording medium includes a first elastic member that biases the head in a direction toward the recording medium, and a second elastic member that biases the head in a direction away from the recording medium. an elastic member, and a driving means for selectively applying the urging force of the first or second elastic member to the head, and the operation of the driving means applies the urging force of the first elastic member to the head. A head access mechanism characterized in that a biasing force of a second elastic member is applied to the head when the drive means is inactive or driven in a reverse direction.