JPH0490130A - Dust preventing mechanism for carriage part - Google Patents

Abstract

PURPOSE:To suppress the invasion of dust or the like into a rolling part and a sliding part in a bearing and to make it possible to smoothly move a carriage even in an environment polluted by much dust or the like by using dust preventing covers. CONSTITUTION:The dust preventing covers 23, 24 are laterally symmetrically arranged on rotors 13a to 13e, guide members 5, 6, magnets 7, 8, and yorks 9, 10. Since the guide members 5, 6, etc., are covered with the covers 23, 24, contact faces between the rotors 13a to 13e and the guide members 5, 6 can also be prevented from the adhesion of dust or the like in addition to the sliding parts between the rotors 13a to 13e and their center axes and the carriage can be smoothly moved. Since movable parts are not covered with the covers 23, 24, the weight of the carriage unit is reduced and the speed of the carriage 2 is also increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a dustproof mechanism for a carriage section used in, for example, an optical disk device.

[Prior Art] FIGS. 8 and 9 show a conventional optical disc at an arbitrary position,
An optical pickup carriage mechanism for reading and writing information is shown. ■ is an optical pickup that focuses laser light from a fixed optical system including a laser light source (not shown) onto the optical disc D and tracks minute vibrations such as eccentricity and surface wobbling of the optical disc D, and is mounted on the carriage 2. The optical pickup 1 thus obtained can seek any position in the radial direction of the disk by moving the carriage 2. Further, the carriage 2 is supported by bearings 38 to 3f, and in particular, the lower bearing 3f is biased by a leaf spring 4. Each of the bearings 38 to 3f is a guide member 5. for guiding the carriage 2 in a linear direction.
The guide member 5.6, together with the magnet 7.8 and the yoke 9.10, constitutes a magnetic circuit of the linear motor. Magnet 7.8 is magnetized in the left and right direction on the paper,
Due to the current flowing through the coil 11 integrated with the carriage 2, the carriage 2 moves linearly in the direction of the arrow shown in FIG.

[Problems to be Solved by the Invention] Generally, in order to move the carriage 2 at high speed for the purpose of shortening the seek time, (1) increasing the number of turns of the coil 11 or increasing the length of the coil 11 that crosses the magnetic flux; There are two methods: (1) increasing the output of the linear motor by increasing the linear motor speed or passing more current; (2) reducing the weight of the moving parts.

However, method H leads to an increase in the size and cost of the equipment itself, and method (2) also has limitations in reducing the size and weight of parts with defined station paths, such as bearings, and the rolling noise of bearings. is also a problem. There is also a method of using a sliding bearing instead of a bearing, but this has problems such as durability and friction. Furthermore, in the case of sliding bearings, there is a problem that the coefficient of friction deteriorates due to the adhesion of dust and the like.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the dustproof mechanism for the carriage part according to the present invention includes a rotating body bearing mechanism that rolls and moves along a guide member while rotating around a central axis. The bearing mechanism is covered with a dustproof cover to prevent dust from adhering to the bearing mechanism.

[Function] The dustproof mechanism of the carriage part having the above-mentioned configuration is a dustproof mechanism that prevents dust from adhering to the rolling shaft, which is composed of other protective members including the periphery of the rotating body and a central shaft on which the rotating body slides. Providing a cover ensures smooth operation.

[Example] The present invention will be described in detail based on the example illustrated in FIGS. 1 to 7.

In FIG. 1, a rotating body 1 made of sintered oil-impregnated metal material
A central shaft 14 that supports 3 is fixed to a carriage 15. Further, the diameter of the end portion 14a of the central shaft 14 is
It is shaped to cover the joint between the center shaft 14 and the center shaft 14 . The rotating body 13 is in contact with the guide member 16, and there is a contact surface between the rotating body 13 and the central shaft 14 in the thrust direction, a contact area 17 between the end 14a of the central shaft 14 and the rotating body 13, and a contact surface between the rotating body 13 and the carriage. A slight clearance is provided on the contact surface 18 with the rotating body 15 so that the central shaft 14 does not press the rotating body 13. In this case, the rotating body 13 rolls on the guide member 16, and the rotating body 13 rolls on the central axis 14.
It is possible to prevent dust and the like from entering the sliding movement between the rotating body 13 and the central shaft 14.

In FIG. 2, a protective ring 19 having relatively high rigidity, such as iron-based material, is provided around the rotating body 13.
is protected. Further, in FIG. 3, the shape of the end portion 14b of the central shaft 14 is made large enough to cover the side surface of the rotating body 13, further enhancing the dustproof effect.

4 and 5 show other embodiments, and the same reference numerals as in the conventional example shown in FIGS. 8 and 9 represent the same members. A dustproof cover 22 is placed over the optical pickup 1 and the rotating bodies 13a to 13e, making it difficult for dust etc. to get into the rotating bodies and the sliding parts in the center shaft 14 among the rotating bodies 13a to 13e. The carriage 2 can be smoothly operated.

Further, FIGS. 6 and 7 show other embodiments, in which the rotating body 13
a to 13e, guide member 5.6, magnet 7.8, yoke 9
．． Dust-proof covers 23 and 24 are arranged symmetrically on top of the dust cover 10 . This dustproof cover 23.24 is attached to the guide member 5.6.
etc., it is difficult for dust to adhere not only to the sliding parts between the rotating bodies 13a to 13e and the central shaft 14 (but also to the contact surfaces between the rotating bodies 13a to 13e and the guide member 5.6). This allows the carriage 2 to move smoothly.Furthermore, since the covers 23 and 24 are not provided on the movable parts, the weight of the carriage unit can be reduced, leading to increased speed of the carriage 2.

[Effects of the Invention] As explained above, by using the dustproof cover, the dustproof mechanism of the carriage part according to the present invention makes it difficult for dust to enter the rolling parts and sliding parts of the bearing, and can be used in environments with a lot of dust. However, the carriage can be moved smoothly.

[Brief explanation of drawings]

Drawings 1 to 7 show an embodiment of a dustproof mechanism for a carriage part according to the present invention, FIGS. 1 to 3 are sectional views of the bearing mechanism, respectively, and FIG. 4 is a plan view of the embodiment, and FIG. 5 is a sectional view, FIG. 6 is a plan view of another embodiment, FIG. 7 is a sectional view, FIG. 8 is a plan view of a conventional carriage mechanism, and FIG. 9 is a sectional view. Symbol l is an optical pickup, 2 is a carriage, 5.6 is a guide member, 7.8 is a magnet, 9 is a yoke, 13 is a rotating body,
14 is a central shaft, and 22, 23, and 24 are dustproof covers. 10 is

Claims (1)

[Claims] 1. A dustproof mechanism for a carriage section, characterized in that a rotor bearing mechanism that rolls and moves along a guide member while rotating around a central axis is covered with a dustproof cover to prevent dust from adhering to the bearing mechanism.