JPH04114374A - Disk driving device - Google Patents

Abstract

PURPOSE:To travel a head by constant amount of travel accurately and in a short time by moving a lead screw by constant amount in a prescribed axial direction, and simultaneously moving a carriage by the constant amount. CONSTITUTION:When the recording of a first field is performed on a targeted track, thence, that of a second field is performed, an electromagnet 50 is energized after the recording of the first field is completed. At this time, an armature 44, a shaft 66, a flat spring 48, and the electromagnet 50 are arranged so as to surely move the lead screw 22 by distance L equivalent to one track pitch in the axial direction by energizing the electromagnet 50, thereby, a magnetic head 14 can be quickly and accurately moved by one track.

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 speed of recording and reproduction depends on the head positioning accuracy of the feeding mechanism, and is limited by the head feeding speed.

For example, in an electronic still camera, one field of video signals is recorded on one track, and two adjacent tracks are used for frame video. To record or reproduce a frame video, if a frame head is used that integrates two heads separated by one track pitch, track switching can be performed electronically at high speed, but the frame head is expensive. Therefore, a configuration has been proposed in which a field head consisting of one head is used and the field head is moved at high speed by one track pitch in order to record the second field after recording the first field.

For example, a disk drive device converts rotational motion into linear motion using a mechanism consisting of a lead screw and a pin inserted into its groove, and moves a carriage supporting a head linearly in conjunction with the bin, and・
A play corresponding to the track pitch is provided in the groove of the screw with respect to the bin, and a first spring is applied to the carriage to bias the disk toward the outer circumference, and a first spring to bias the disk toward the inner circumference is applied to the carriage. A second spring, which is weaker than the spring, is applied, and under normal conditions, the pin is shifted to one side in the groove of the lead screw toward the outer peripheral end surface in the axial direction of the lead screw,
When recording the second field of frame recording, the first spring is disabled by an actuator such as an electromagnet, and the second spring is used to move the pin to the lead.
A configuration has been proposed in which the screw is moved at high speed to the inner peripheral end surface of the groove of the screw.

[Problems to be Solved by the Invention] The above configuration has the advantage that it is easier to obtain the required accuracy and requires fewer parts to be adjusted. The disadvantage is that the screw must be precisely formed over the entire range to have play equivalent to the pitch, making machining extremely difficult.

Further, an actuator is required to disable the first spring, which has the disadvantage of complicating the mechanism.

Therefore, the present invention has developed a disc/disk that eliminates these drawbacks.
The purpose is to present a drive device.

[Means for Solving the Problems] A disk drive device according to the present invention is a disk drive device that linearly moves a carriage supporting a head using a rotational-linear conversion mechanism consisting of a lead screw and a penetrating member that penetrates into a groove thereof. The drive device includes a support member that supports the lead screw so as to be movable in its axial direction, a movement restriction member that allows the lead screw to move a certain amount in a predetermined axial direction, and Lead
A biasing member for selectively biasing the screw in the predetermined axial direction is provided.

[Function] The biasing member moves the lead screw in the predetermined axial direction, and the amount of movement is regulated to a constant amount by the movement regulating member. As the lead screw moves axially, the carriage also moves the same amount. Therefore, it becomes possible to move the head by a certain amount accurately and in a short time.

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

FIG. 1 is a plan view of an embodiment of the present invention applied to an electronic still camera. 10 is a spindle motor that rotates the magnetic disk, and 12 is a housing. 14 is a single magnetic head, which is fixed to the carriage 16. A bearing is provided at one end of the carriage 16 (on the left side in the drawing), and a guide rod 18 is inserted through the bearing. Reference numeral 20 denotes a regulating rod that comes into contact with the other end of the carriage 16 and regulates its height. A lead screw 22 is supported by bearings 24 and 26 fixed to the housing 12 so as to be movable in the axial direction of the lead screw 22.

A bottle (or plate) 30 fixed to the carriage 16 via a connecting plate 28 penetrates the groove of the lead screw 22 . Reference numeral 32 designates a step motor for rotating the lead screw 22, and a worm gear 34 on its rotating shaft meshes with a gear 36 fixed to the lead screw 22. 38 is lead screw 2
This is a regulation screw that regulates the amount of axial movement of 2.
The screw 22 cannot be moved further than the distance shown in the upper part of the figure. In this embodiment, ff1l corresponds to one track pitch. 4° is a spring that urges the carriage 16 downward in the figure.

One end of the lead screw 22 has a thin shaft 22a, and 42 has a stepped portion that allows the lead screw 2 to
This is a stopper that restricts the movement of 2 in the downward direction in the drawing. The stopper 42 is fixed to the housing 12.

44 is an armature, and the shaft 4 fixed to the housing 12
It is rotatably attached to 6. Armature 44
A leaf spring 48 facing the tip of the axis 22a of the lead screw 22 is fixed to one end of the lead screw 22. 50 is an electromagnet that attracts the other end of the armature 44 when energized.

Next, the operation of the illustrated embodiment will be explained. Note that in a normal state, the state is as shown in FIG. 1, and when recording the second field in frame recording, the state is as shown in FIG. 2.

When moving the magnetic head 14 to a desired track, the step motor 32 is rotated by a predetermined amount.

Then, the worm gear 34 and the gear 36 rotate the REET screw 22 by a predetermined amount. carriage 16
Since the pin 28 is urged in the direction of the arrow by the spring 28, the pin 28 is always in contact with the outer peripheral end surface within the groove of the leat screw 30, and only the disc corresponding to the rotation of the leat screw 22 moves the carriage. 16, that is, the magnetic head 14 moves linearly.

For example, suppose that the first field is recorded on a target track, and then the second field is recorded. After recording the first field, the electromagnet 50 is energized. Then, the armature 44 is attracted to the electromagnet 50 and the shaft 46
Rotate clockwise around the center. Then, armature 4
A leaf spring 48 fixed to the end of the lead screw 22 pushes the lead screw 22 upward in FIG.

FIG. 2 shows this stopped state. The gear 36 is made thick so that it remains engaged with the worm gear 34 even in this state.

The armature 44, the shaft 46, the leaf spring 48, and the electromagnet 50 are arranged so that the lead screw 22 can be reliably moved axially by a certain distance by energizing the electromagnet 50. In the state shown in FIG. The spring 48 is designed to be slightly curved.

Since L corresponds to one track pitch, the magnetic head 14 can be moved one track at high speed by energizing the electromagnet 50. The response time of the electromagnet 50 is typically 6
It is fast at ~8ms. Since the time for one rotation of the magnetic disk is approximately 16.7 ms in the case of the NTSC system, in this embodiment, the magnetic head 14 can be moved to the next track within one rotation of the magnetic disk.

After recording the second field, the electromagnet 50 is de-energized.

Then, it is released from the armature 44 or the electromagnet 50,
Since the carriage 16 is biased toward the original track by the force of the spring 40, the lead screw 22 is also
It moves downward in the figure and returns to the state shown in FIG. 1.

In the above embodiment, the case where recording is performed on two tracks using a single channel head has been explained, but the present invention can also be applied to the case where recording is performed on four tracks by using a frame head that integrates two magnetic heads. Applicable.

It goes without saying that the present invention can be applied not only to recording devices but also to playback devices.

In the above embodiment, the electromagnet 50 is used as the actuator, but in addition to this, a laminated piezoelectric element, a bimorph element, etc. can also be used.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, the head can be moved a certain distance with high accuracy and high speed with a very simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a plan view after movement a predetermined distance. 10 Nissindle motor 12. Housing 14: Magnetic head 16: Carriage 18 Guide rod 20: Control rod 22; Lead screw 22a: Axis line 24,2
6: Bearing 28: Connecting plate 30; Pin 32 Step motor 34: Worm gear 36: Gear 38:
Regulation screw 40: Spring 42: Stopper 44: Armature 46: Shaft 48: Leaf spring 50: Electromagnet ■Nino

Claims (1)

[Claims] A disk drive device that linearly moves a carriage supporting a head using a rotational-linear conversion mechanism consisting of a lead screw and a penetrating member inserted into its groove, and supports the lead screw so as to be movable in its axial direction. a support member that allows the lead screw to move by a certain amount in the predetermined axial direction; and a biasing member that selectively biases the lead screw in the predetermined axial direction. A disc characterized by the provision of
drive device.