JPH05166246A - Buffer mechanism for magneto-optical disk device - Google Patents

Abstract

PURPOSE:To satisfactorily keep an initial characteristic of a damper member by measuring an environmental temp. in the magneto-optical disk device where the damper is positioned and heating directly or indirectly the damper member when this temp. drops under a fixed temp. CONSTITUTION:The damper member 1 is interposed between a substrate where a spindle motor for rotatively driving a discoid recording medium, a laser light source, an objective lens, a focusing and tracking control mechanism for the objective lens and a focusing and tracking sensor part, etc., are installed, and a device enclosure 3 packaging these parts, so as to function for the purpose of buffering external vibration and impact force. In this case, a temp. sensor 8 is arrange inside the device enclosure 3, and is also equipped with a heating means 7 for heating the damper member 1 based on a detecting signal of the temp. sensor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device for magneto-optically recording / reproducing information, and vibrates between a base equipped with various mechanisms and a device housing in which these are installed. The present invention relates to a cushioning mechanism that cushions impact force.

[0002]

2. Description of the Related Art Usually, in a magneto-optical disk device, a device housing and a base (here, a spindle motor for rotating a disk-shaped recording medium, a laser light source, an objective lens, focusing of the objective lens, tracking control (Mechanism, focusing, tracking sensor, etc. are installed), and a damper member made of rubber-based or urethane-based material is interposed between them, and vibrations and shocks input from outside the device in each direction are internal. It prevents direct transmission to the mechanism, suppresses disturbances such as servo systems, and prevents damage to the device.

For example, as shown in FIGS. 4 to 6, a damper member 1 is attached to a base 2 via a fixing screw 5, and an apparatus is attached via an L-shaped attaching member 4. It is supported by the casing 3. In addition, here
The mounting member 4 is supported by the device casing 3 via fixing screws 6.

[0004]

However, since the magneto-optical disk device is usually used in an environment over a wide temperature range from a considerably high temperature to a low temperature, the damper member is affected by the temperature change, There is a risk that the damping effect cannot be fully exerted. In particular, in the low temperature state, the rigidity and the viscosity of the damper member largely change, and the damping characteristics are significantly impaired. That is, the vibration insulation model characteristic of the "mass-spring-damper system" formed between the damping member and the base changes, and the natural frequency changes.

Usually, the above-mentioned "mass-spring-damper system".
In order to obtain sufficient damping characteristics for the vibration isolation model characteristics of the external vibration force, the natural frequency is
So that the order of several tens of H _Z from H _Z, the rigidity of the damper member, viscosity, but of setting such as mass, vibration from the outside of the apparatus, the main frequency components of the impact is also about several tens of H _Z In many cases, the power is also sufficiently large. Initially, even if the selected and set natural frequency is devised so as to be separated from the frequency components of the external vibration and shock, when the environmental temperature is relatively low, the damper characteristics change, the frequency approaches, and the base side In the above, there is a problem that the effect of suppressing disturbance on the servo system is reduced, and conversely, the resonance system is promoted, so that the mechanical vibration characteristics of the entire apparatus are significantly changed in terms of performance and the servo performance is deteriorated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and measures the environmental temperature in which a damper member in a magneto-optical disk device is placed, and when the temperature falls below a certain temperature. An object of the present invention is to provide a shock absorbing mechanism for a magneto-optical disk device in which the damper member is heated directly or indirectly so as to sufficiently maintain the initial characteristics of the damper member.

[0007]

Therefore, according to the present invention,
Spindle motor for rotating a disk-shaped recording medium, laser light source, objective lens, focusing of the objective lens, tracking control mechanism, focusing,
A damper member is interposed between a base on which a tracking sensor unit and the like are installed, and a device housing in which these are installed, so that the magneto-optical disk device can function to absorb external vibration and impact force. In the buffer mechanism, a temperature sensor is arranged inside the device casing, and a heating means for heating the damper member based on a detection signal of the temperature sensor is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described in detail with reference to. In the figure, the same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. Here, a temperature sensor 8 is mounted on the device casing 3, and a heating means 7 such as an electric heater is mounted on the mounting member 4 at a position close to the damper member 1.

Then, the temperature sensor 8 measures the ambient temperature around the damper and supplies it to a control system (not shown) such as a CPU. The control system determines whether or not the temperature is such that the characteristics of the damper member 1 are deteriorated, and when the damper member 1 does not have the expected characteristics, the heating means 7 is operated. By urging, the temperature of the damper member is raised so that the characteristics of the damper member can be sufficiently exhibited.

As a result, even if the ambient temperature is low, the apparatus as a whole can sufficiently dampen external vibrations and shocks to prevent or suppress their transmission to the base 2 side, thus providing a stable servo. Gain benefits such as maintaining the system. At this time, in order to prevent the damper member from being heated more than necessary, it is necessary to take measures such as considering the sensitivity of the temperature sensor 8 or preparing another feedback sensor. ..

In the above embodiment, the heating means is provided in the vicinity of the damper member. However, the heating means may be provided directly inside the damper member.

[0012]

As described above, according to the present invention, the temperature sensor is arranged inside the device casing, and the temperature sensor is interposed between the device casing and the base based on the detection signal of the temperature sensor. Since it is equipped with heating means for heating the damper member, even if the ambient temperature is low,
It is possible to sufficiently dampen external vibrations and shocks to prevent or suppress their transmission to the base side.
It is possible to maintain damper characteristics such as maintaining a stable servo system.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing the same embodiment as seen from the arrow AA of FIG.

FIG. 3 is an end view showing the same embodiment.

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a vertical cross-sectional side view showing the conventional example as seen from the arrow AA of FIG. 4.

FIG. 6 is an end view showing the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damper member 2 Base 3 Device housing 4 Mounting member 5, 6 Fixing screw 7 Heating means 8 Temperature sensor

Claims (1)

[Claims] 1. A base on which a spindle motor for rotatively driving a disk-shaped recording medium, a laser light source, an objective lens, focusing of the objective lens, a tracking control mechanism, a focusing, a tracking sensor unit, and the like are installed, and these are incorporated. In the shock absorbing mechanism of the magneto-optical disk device, wherein a damper member is interposed between the device housing and the device housing, the temperature sensor is arranged inside the device housing. A buffer mechanism for a magneto-optical disk device, further comprising heating means for heating the damper member based on a detection signal of the temperature sensor.