JPH0467478A - Disk driving device - Google Patents

Abstract

PURPOSE:To move a head by a constant distance by providing play by the fixed constant distance to a pin on the groove of a lead screw and deviating the pin to the one of the two end-faces in the axial direction within the groove of the lead screw. CONSTITUTION:When an electromagnet is energized, an armature 46 is attracted, a shaft 44 is turned in a center clockwise direction, a pin 48 is pushed in the direction of an arrow B and a pin 36 becomes free within a long hole 34a. Consequently, the energizing force of a spring 40 does not work to a carriage 10, the carriage 10 is energized in the direction of the arrow B by a spring 32, a pin 18 is moved within the groove of a lead screw and the carriage 10, that is, a head is moved to a next track instantly. Thus, the head movement of fixed distance is available.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk drive device that rotates a rotating recording medium such as a magnetic disk and performs recording and/or reproduction using a recording/reproducing head.

[Prior Art] In a rotating recording medium such as a magnetic disk, signals are recorded on a plurality of concentrically arranged tracks, and the recording density is determined by the head that moves the recording/reproducing head in the radial direction of the magnetic disk. The recording/reproducing speed depends on the head positioning accuracy of the feeding mechanism, and the recording/reproducing speed depends on the head feeding speed.

For example, an electronic still camera records one field of video signal on one track, and in the case of frame video,
Two adjacent tracks are to be used. Therefore, when performing frame recording or reproduction using one magnetic head, the magnetic head must be moved and positioned to an adjacent track within the time period other than the video portion of the field video signal.

From this point of view, electronic still camera discs and
For drive devices, a configuration has been proposed in which a magnetic head is moved at high speed between adjacent tracks.

[Problems to be Solved by the Invention] However, in the conventional example, a large number of parts were required to precisely position the magnetic head on adjacent tracks, and many parts required adjustment. Therefore, in the conventional example, it has been an obstacle to miniaturization and cost reduction.

Such problems are common to drive devices for magneto-optical disks and optical disks. Therefore, in this specification, a recording, reproducing or erasing magnetic head or optical pickup used in such a disk drive device will be hereinafter collectively referred to as a recording/reproducing head or simply a head.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk drive device that can move a recording/reproducing head a certain distance in the radial direction of a rotating recording medium precisely and at high speed.

[Means for Solving the Problems] A disk drive device according to the present invention is a disk drive device that moves a carriage that supports a head using a rotation-linear conversion mechanism that includes a lead screw and a pin that penetrates into a groove thereof. The groove of the lead screw is provided with play of a predetermined constant distance with respect to the pin, and one of the two end faces of the lead screw in the axial direction is selected within the groove of the lead screw. The present invention is characterized in that it is provided with a biasing mechanism that biases the pin to one side.

[Operation] By the above means, if the play in the groove of the lead screw is one track pitch, the lead screw can be instantly moved to the next track. If the play width is precisely manufactured, the head will be positioned on the adjacent track with sufficient accuracy, and therefore sufficient head movement speed and positioning accuracy can be obtained.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of an embodiment of the present invention applied to an electronic still camera, and a plan view of a portion of FIGS. 2 and 3. Reference numeral 10 denotes a carriage to which a one-channel magnetic head (not shown) is fixed. The shafts 12, 12 fixed to the carriage 10 and extending on both sides are inserted through bearings 14.14 fixed to a housing frame (not shown), so that the carriage 10 slides in the direction of the shafts 12.12. freely supported. 16 is a lead screw rotatably attached to a housing frame (not shown). A pin 18 engages with a groove in the lead screw 16 and is fixed to a connecting plate 22 by a spring plate 20, and the connecting plate 22 is fixed to the carriage 10.

24 is a worm fixed to the lead screw 16.
The wheel 26 is a worm gear that meshes with the worm wheel 24, and is fixed to the rotating shaft of the step motor 28.

30 is a spring hook fixed to the carriage 10, and 32 is a spring with one end hooked to the spring hook 30 and the other end hooked to the housing frame (not shown), which biases the carriage 10 in the direction of arrow B in FIG. are doing.

A slide plate 34 is arranged above the carriage 10 in parallel to the carriage 10, and a pin 36 of the carriage body 10 penetrates into a long hole 34a of the slide plate 34. The long hole 34a is elongated in the direction of the arrow AB, and therefore the slide plate 34 is movable in the direction of the arrow A-H within the range of the long hole 34a. Reference numeral 38 denotes a spring hook mounted on the slide plate 34, and a spring 40 is hung between the spring hook 38 and a housing frame (not shown). The spring 40 urges the slide plate 34 in the direction of arrow A, and its force is set to be stronger than that of the spring 32.

Reference numeral 42 denotes an interlocking plate that interlocks with the carriage 10 by a structure to be described later, and the armature 4 is connected to a shaft 44 set on this plate.
6 is rotatably attached. Armature 46
is attached at a position where it interferes with a pin 48 planted on the lower surface of the slide plate 34. 50 is an electromagnet fixed to the interlocking plate 42 via the support plate 52. A pin 54 fixed to the interlock plate 42 penetrates a groove in the lead screw 16. 56 is a spring that biases the interlocking plate 42 in the direction of arrow A.

The operation of this embodiment will be explained using an example in which a frame image is recorded, that is, a case in which a first field's video signal is recorded on a certain track and a second field's video signal is recorded in an adjacent track. First, the step motor 28 is rotated to move the head to the target track position. This rotation causes the lead screw 16 to rotate through the worm gear 26 and worm wheel 24, causing the pin 18°5 to penetrate into the groove of the lead screw 16.
4 moves in the direction of arrow A or B. Since the pin 18 is integrated with the carriage 10, the carriage 10 also moves in the direction of arrow A or B. Further, since the pin 54 is fixed to the interlocking plate 42, the interlocking plate 42 moves in the direction of the arrow A or B in conjunction with the carrier screw 10. Therefore, the relative positional relationship between the armature 46 attached to the interlocking plate 42 and the gear 1 angle is the same as that of the step motor 2.
It remains constant regardless of the rotation of 8.

A plan view of the head moved to the target track position by the rotation of the step motor 28 is shown in FIG. In this state, the carriage 10 is connected to the pin 38' and the slide plate 3.
4 and is biased in the direction of the arrow by the spring 40, and the groove of the lead screw 16 and the pin 18 are in a positional relationship as shown in FIG. Fourth
In the figure, L is the axial width of the groove in the lead screw 16 and D is the diameter of the pin 18 as viewed in the axial direction of the lead screw 16. The dimension of D is determined so that (LD) is one track pitch. In this state, by pressing a release button (not shown), the video signal of the first field of the photographed video is recorded on the track at the current head position.

After recording the video signal of the first field, the electromagnet 50 is energized. Then, the armature 46 is attracted and rotates clockwise about the shaft 44 in FIG. 2, thereby pushing the pin 48 in the direction of arrow B, so that the pin 36 is pushed into the elongated hole 34a as shown in FIG. become free. As a result,
The biasing force of the spring 40 no longer acts on the carriage 10,
Carriage 10 is urged in the direction of arrow B by spring 32. Due to the biasing force of spring 32, pin 18 moves within the groove of threaded screw 16 by (L-D) and assumes the position shown in FIG. That is, by energizing the electromagnet 50, the gear ridge 10, ie, the head, instantaneously moves to the adjacent track. Needless to say, the head movement by energizing the electromagnet 50 is completed within the time required for one revolution of the magnetic disk (approximately 16°67 m5 in the case of a 2-inch floppy disk). After the head moves to the next track, the video signal of the second field is recorded.

Needless to say, if the power to the electromagnet 50 is cut off, the state shown in FIG. 2 is immediately restored.

When using a 2-channel head and wanting to instantly move 2 track pitches, (L-D) should be 2.
The dimension of D may be changed to correspond to the track pitch.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, the head can be moved over a predetermined distance with a very simple configuration, and high-speed movement can also be expected.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of one embodiment of the present invention, FIGS. 2 and 3 are plan views of the main parts, and FIGS. 4 and 5 are the positional relationship between the groove of the lead screw 16 and the pin 18. It is a diagram. 10: Carriage 12: Shaft 14: Bearing 16: Lead screw 18: Pin 20: Spring plate 22:
Connecting plate 24, worm wheel 26: worm gear 28 step motor 30: spring hook 32:
Spring 34NiRide plate 34a: Long hole 36: Pin
38: Spring hook 40: Spring 42: Interlocking plate 44: Shaft 46 Armature 48: Pin 50: Electromagnet 52
: Support plate 54; Pin 56: Spring

Claims (1)

[Claims] A disk drive device that moves a carriage supporting a head by a rotation-linear conversion mechanism consisting of a lead screw and a pin inserted into the groove thereof, the groove of the lead screw having a predetermined position relative to the pin. A biasing mechanism is provided for selectively biasing the pin toward one of the two axial end surfaces of the lead screw within the groove of the lead screw by providing play by a certain distance. Disk drive device.