JPS58211363A - Carriage assembly - Google Patents

Abstract

PURPOSE:To prevent the distortion of a carriage, by attaching the driving voice coils across a carriage containing a magnetic disk head and in its traveling direction and having coincidence between the center of the driving force and the centroid of the carriage. CONSTITUTION:A carriage 4 containing a magnetic disk head 3 is supported by a guide rail 5 via a bearing 41a and moves forward and backward smoothly by a bearing 41b and a flat rail 42 and rectangularly to the surface of paper. Voice coils 21 and magnets 23 are provided across the carriage 4 to form a linear motor. In this case, it is required that a straight line X-X' connecting substantially the center of the driving force of said linear motor passes through the centroid G of the carriage 4. As a result, the carriage 4 can move at a high speed with no generation of distortion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel carriage assembly, and more particularly to a linear access pink disk file device.
This relates to a 6f carriage assembly supported on a lug. .

One of this invention? The v-ridge assembly is particularly useful in optical tisfing devices and will be described in connection therewith below.

FIG. 1 shows a conceptual diagram of the disk, big amplifier, and carriage. In this figure, a disc-shaped optical disc 1 is rotated at high speed by a spindle motor 2. As shown in FIG. Information is recorded concentrically on the bottom surface of the optical disc 1, and is read by Pink 7 No No 3. The concentric circles in which information is recorded are called tracks, and the interval between them is usually 1.
~3/Am 3, the pickup 3 is mounted on the carriage 4, and the optical disk 10 moves freely in the radial direction along the carriage 4ii guide rail 5.
'-Can be done 1, so that the pickup 3 can be positioned on any trunk on the optical disk 1.

In this type of optical disk device, the pink-up 3
And the movement of carriage 4 from track to track is very fast (eg tens of milliseconds). Also, in order to read the information without any error on the track,
The pickup 3 must be positioned accurately (for example, with an accuracy of 20 to 30 μm) on the target track.

Conventionally, the pickup drive mechanism of an optical disk device has been a single type using a ball screw or belt drive, and a single type using a ball screw or belt drive. It is difficult to achieve high-speed, high-precision positioning due to factors such as low rigidity and cracks.

First, the problems that arise with the system that lacks a linear motor will be explained using FIGS. 2 and 3.

FIG. 2 is a first view showing a conventional linear motion type carriage drive mechanism, and is a front view seen from the direction in which the carriage advances. It is mounted on the Pink Up 31i carriage 4, and includes a driving voice fill 21 and a center yoke 22. It is composed of magnets 23a to 23c, and is moved in a direction perpendicular to the plane of the paper by the driving force of the Talinia E-mount (at this time,
While the center C of the driving force is located near the center of the driving voice coil 21, the center of gravity of the entire carriage is located near G due to the weight of the pickup 3. the result,
As shown in FIG.
A moment is generated that rotates the This moment pitches the carriage 4 and induces stiffness vibration due to the deformation. These phenomena are extremely harmful to the control system for positioning the carriage 4.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and by attaching driving voice coils to both sides of a 4-gear carriage and spatially aligning the center of the driving point and the center of gravity. It is an object of the present invention to provide a carriage assembly capable of stable high-speed movement and positioning without causing pitching or deflection imaging that is harmful to positioning control. An embodiment of this invention will be described below.

FIG. 4 is a front view of the carriage assembly of the present invention.

The carriage 4 carries the pickup 3, is controlled in the left and right direction by the guide rail 5, and moves smoothly by the bearing 41a (also, the flat rail 42 and the bearing 41b are used to suppress unnecessary vertical movement of the carriage 4). belongs to.

In this carriage 4, the driving voice coil 21+
-1. There should be two attached, one on each side of the carriage 40. On the other hand, since this carriage 4 is symmetrical, the center of gravity position G of the entire carriage is
exists at the center of Driving whirlpool coil 21&'i,,
It is installed so that the straight line xx' connecting the two centers of the driving force passes through the center of gravity or the vicinity thereof. the result,
The resultant force of the driving forces from the two driving voice coils 21 is:
It is almost the same as Carry Run 40 center of gravity KG.

As explained above, the carriage assembly of the present invention is
The driving voice coils are attached to both sides of the gear carriage, and the center of the driving force of the driving voice coils is aligned with the center of gravity of the carriage. No external force is generated that causes pitching, machining, or flexural vibrations.An advantage of this is that stable high-speed performance can be obtained.

[Brief explanation of drawings]

Figure 41 is a simple configuration diagram of the optical disk, carriage, and big amplifier. Figure 2 is a front view of the gear ridge of the conventional glue-drive type. Figure 3 is the conventional gear ridge. - A side view of the amotor type carriage, showing that the center of gravity and the center of the driving force are at
), FIG. 4 is a front view of a carriage assembly showing an embodiment of the present invention, and FIG. 5 is a side view of FIG. 4. In the figure, 3 is a big amplifier, 4 is a carriage, 5 is a guide rail, 21 is a driving whirlpool coil, 22 is a center yoke, 23a to 23Ci'i magnets, and 41a. 41b is a bare link, 42ij1. It is a flat rail. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 2 Figure 2 Figure 4 Figure 5 142

Claims (1)

[Claims] In a carriage assembly including a carriage to which an information converter is attached, and a driving coil for moving the carriage in a bidirectional linear manner, a driving coil is provided on each side of the carriage in the traveling direction of the carriage. Attach the voice coil for both parts, and then align the center of the driving force of the voice coil for both parts with the center of gravity of the - (- spear). Features and -r-b carriage assembly.