JPS6369076A - Head carriage for optical disk device - Google Patents

Abstract

PURPOSE:To prevent characteristics of an optical system from being deteriorated by providing a lower moving mechanism at a position of the inside of an upper part moving mechanism so as to suppress the increase in the deflection of a carriage. CONSTITUTION:A carriage 1 builds in the optical type of a head in the internal part, is equipped with upper rollers 2 and 3 at both edge parts, these rollers 2 and 3 convolute on an upper part guide 6 and move the upper side of the carriage 1. Lower rollers 4 and 5 are equipped at the side inner than the upper rollers 2 and 3, the lower rollers 4 and 5 convolute on a lower guide 7 to guide the lower side of the carriage 1. When the load to press rollers 2-5 to guides 6 and 7 is applied in order to decrease a backlash, the carriage 1 is supported by the lower rollers 4 and 5 at the side inner than both edges and the upper rollers 2 and 3 are applied to both edges. At such a time, the upper rollers 2 and 3 function so as to bend the carriage 1, reversely, the dead weight of the carriage functions so as to bend the center in the descending direction, and therefore, the bending of the carriage 1 is mutually negated and the deflection quantity comes to be smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head carriage for an optical disc device that holds and moves the head of the optical disc device.

[Conventional technology]

FIG. 3 is a side view of a helad carriage of a conventional optical disc device. The carriage 1 has a head mounted on it or a built-in head,
A lower roller 4 and a lower roller 5 were provided at both ends, and an upper roller 2' was provided in the center.

The lower rollers 4 and 5 roll on a lower guide 7 provided in the optical disc device, and the upper roller 2' rolls on an upper guide 6, moving the carriage 1 along the upper and lower guides 5.6. I will guide you as follows. In order to eliminate backlash (play) in this guiding, it is necessary to apply a load to press the rollers 2', 4.5 against the guide 6.7.

[Problem that the invention seeks to solve]

In the bed carriage of the conventional optical disk device described above, when a load is applied to remove play in the guidance by the guides 5 and 6, the carriage l receives an upward load from the rollers 4 and 5, and a downward load from the roller 2'. The disadvantage is that the lower side is bent so that it is convex due to the weight, and at the same time, the lower side is bent so that it is convex due to its own weight, resulting in large flexure.

That is, in this case, the same deflection as that of the beam 8 which is supported at both ends by the supports 9 and 10 which receive the load W1 at the center as shown in FIG. 4 occurs. The beam 8 is bent in the same direction by the load W1 and its own weight M, resulting in increased deflection.

Since the optical system of the head is attached to the carriage 1, if the deflection of the carriage 1 becomes large, the optical system will also be distorted and the characteristics of the optical disc device will deteriorate.

In other words, in the conventional Herad carriage of an optical disk device, the load for reducing play and the weight of the carriage 1 work in the same direction, increasing the bending of the carriage 1 and deteriorating the characteristics of the optical disk device.

The problem to be solved by the present invention is to improve the problem that the effects of load bending and self-weight bending of the conventional optical disk device are combined. Therefore, the purpose of the present invention is to eliminate the above-mentioned drawbacks. An object of the present invention is to provide a helad carriage for an optical disc device that can prevent the carriage from becoming large bent.

[Means for solving problems]

The head carriage of the optical disk device of the present invention includes an upper guide and a lower guide provided in the optical disk device, a carriage guided by the upper guide and the lower guide and attached with a head, and an upper portion attached to both ends of the carriage. The carriage includes a plurality of upper moving mechanisms that move along a guide, and a lower moving mechanism that is attached to a part of the carriage inside a part to which the upper moving mechanisms are attached and moves along the lower guide. Ru.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

1 (a> and (b) are a side view and a view along arrow AA' of an embodiment of the present invention, respectively. The carriage 1 is
The head optical system is built inside, and upper rollers 2 and 3 are provided at both ends, and the upper rollers 2 and 3 roll on an upper guide 6 to move the carriage 1 above. (In this embodiment, rollers made of ball bearings, etc. are used to move the carriage, but other moving mechanisms (sliding bearings, etc.) are also possible.) The carriage 1 is provided with rollers 4 and 5, and the lower rollers 4 and 5 roll on a lower guide 7 to guide the lower side of the carriage 1.

In this embodiment, in order to reduce play, the rollers 2 to 5 are guided by 6.
The relationship between force and deflection when a pressing load is applied to 7 will be explained using FIG.

The beam 8 (corresponding to the carriage 1) is supported by supports 9 and 10 (corresponding to the lower roller 4.5) on the inside from both ends, and loads W3. W4 (corresponding to upper rollers 2 and 3) is added. At this time, load W3. W4 acts to bend the beam 8 in a direction that lifts the center of the beam 8. Conversely, the own weight M of the beam 8 acts to bend the beam 8 in a direction that the center falls.In other words, the load W3. The bending of the beam 8 due to W4 and its own weight M cancel each other out, and the deflection of the beam 8 is reduced compared to the head A beam of the conventional optical disk device.

Therefore, the deformation of the carriage 1 is small, and the deterioration of the characteristics of the built-in optical system is also small.

〔Effect of the invention〕

As explained above, the present invention has the effect that by providing the lower moving mechanism at a position inside the lower moving mechanism, the deflection of the carriage can be prevented from increasing, and the deterioration of the characteristics of the optical system can be prevented.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a side view and an AA' arrow view of an embodiment of the present invention, respectively, and FIG. 2 is a beam diagram for explaining the relationship between force and deflection of the embodiment of FIG. Schematic diagram of
FIG. 3 is a side view of a head carriage of a conventional optical disc device, and FIG. 4 is a schematic diagram of a beam for explaining the relationship between force and deflection of the head carriage of the conventional optical disc device shown in FIG. 1... Carriage, 2.2', 3... Upper roller, 4.5... Lower roller, 6... Upper guide, 7...
...Lower 1-1゜(α) O)) Figure 1 Figure 2

Claims (1)

[Claims] An upper guide and a lower guide provided in the optical disc device, a carriage guided by the upper guide and the lower guide and having a head attached thereto, and a plurality of upper movers attached to both ends of the carriage and moving along the upper guide. A head carriage for an optical disk device, comprising: a mechanism; and a lower moving mechanism that is attached to a part of the carriage inside a part to which the upper moving mechanism is attached and moves along the lower guide.