JPH01320683A - Optical disk device - Google Patents

Abstract

PURPOSE:To attain the high speed of an access time by fixing a part to a carriage to load an optical head, sliding it with a sub-shaft and providing an oscillation attenuating means to attenuate the oscillation of the carriage. CONSTITUTION:An optical head 1 to execute the input and output of information is fixed to a carriage 2, and the carriage 2 and a main shaft 7 and a sub-shaft 8 provided to linearly move the carriage 2 in the rectangular direction the optical axis of an optical pickup 1 can slide through main shaft side bearings 3 and 4 and a sub-shaft side bearing 5. The carriage 2 is driven by the electromagnetic action of a magnetic circuit 10 fixed at the main shaft 7 side of a frame 6 and a coil 9 fitted at the carriage 2. A sliding piece 12 is inserted into the sub-shaft 8 besides the sub-shaft side bearing 5 and a silicone grease is impregnated into a sliding surface 11 with the sub-shaft 8 of the sliding piece 12. The sliding piece 12 is coupled through a plate spring 13 with the carriage 2 and the force is operated in the radius direction of the sub-shaft 8 for the carriage 2. Thus, the access time can be executed at a high speed.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an optical disc device.

(Prior Art) FIG. 5 shows a carriage assembly of a conventional optical disc device. An optical pickup 101 that convolutes or reads information from an optical disc (not shown) is fixed to a carriage 102.
02, and a main shaft 107 and a sub-shaft 108, which are provided to move the carriage 102 in the M line perpendicular to the optical axis of the optical axis 101, are shown in FIG. 6(a) or 6(a). The frame 106 is slidable via the main shaft side bearings 103, 104 and the subshaft side bearing 105, and the magnetic gap formed by the fixed magnetic circuit 1106C and the carriage. The force I generated by electromagnetic interaction with the current flowing through the attached coil 109 causes movement.
As shown in Figure 7 (aJ), 104 has a circular cross section to improve the accuracy of straightness, but the countershaft side bearing 10
5 has an oval cross section with a large clearance in the direction perpendicular to the optical axis in order to improve assembly ease and prevent the optical axis from tilting, as shown in FIG. 7Cb).

However, in the above-described mechanism, when the optical pickup 101 is moved to a predetermined position, the force generated in the coil 109 acts on a position deviated from the center of gravity of the carriage assembly including the optical pickup 101. , rotational moment force around the optical axis acts, causing rotational vibration. On the other hand, since the contact area between the fill shaft 108 and the sub-shaft side bearing 105 is small, the frictional force generated is also small, so that when the carriage 102 stops moving,
The damping effect of the gear ridge 102 was not sufficient, and it was difficult to suppress the rotation of the gear ridge 102 around the optical axis. Therefore, it is necessary to start tracking control after this rotational vibration has subsided, and the challenge has been to achieve faster access times.

(Problem to be solved by the invention) As described above, conventionally, the subshaft and the subshaft 111114111I
Because it was not possible to increase the contact area with the receiver (
However, the damping effect when the carriage stops moving is not sufficient, and therefore tracking control cannot be started until the rotational vibration generated around the optical axis has subsided.

The present invention solves these problems, and aims to provide an optical disc device that can eliminate rotational vibration and speed up access time.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the present invention includes an optical head for inputting and outputting information, a carriage for mounting the optical head, and the carriage. a main shaft that determines the direction of movement of the carriage by sliding with the carriage when the carriage is driven; The original disk device is made up of a subshaft that slides on the subshaft, and a vibration damping means that is partially fixed to the carriage and slides on the subshaft to damp vibrations of the carriage.

(Function) By using such a vibration damping means, the rotational vibration of the carriage around the optical axis is eliminated as much as possible. Therefore, tracking control can be started quickly, and an optical disc device with faster access time is provided.

(Example) The present invention will now be described in detail with reference to the following drawings.

FIG. 1 shows a carriage assembly of an optical disc device according to the present invention. An optical pickup 1 for writing information to or reading information from an optical disk l (not shown) is fixed to a carriage 2. As shown in FIG.

Optically pick up this carriage 2 and carriage 2]
The main shaft 7 and the sub shaft 8, which are provided for moving the original axis in the angular direction l, are shown in Fig. 2 (aJ or Fig. 2 Cb).
As shown in the figure, it is slidable via the main shaft side bearings 3 and 4 and the subshaft side bearing 5, and the main shaft 7 of the frame 6
The force generated by the electromagnetic action between the magnetic gap formed by the fixed magnetic circuit 10t and the Ica flowing through the coil 9 attached to the carriage 21.
Drive is performed by this. The main shaft side bearing 3.4 indicated by nσ is shown in Fig. 3 (
As shown in Figure 3(b), it has a circular cross section to improve the accuracy of straightness, but the sub-shaft side bearing 5 has a circular cross section as shown in Figure 3(b) to improve assembly ease and prevent tilting of the optical axis. Therefore, it has an oval cross section with a large clearance in the direction perpendicular to the optical axis. The contact surfaces are provided with solid or liquid lubrication.

Deputy l1ll! ]81 In addition to the subshaft side bearing 5, the slider 1
2 is inserted. As shown in FIG. 4, this slider 12 has a sliding surface 11 with respect to the subshaft 8 made of a porous member made of sintered copper or ceramics, and has a circular cross section.

This sliding surface 11 is impregnated with silicone grease as a viscous material. Further, the slider 12 is connected to the carriage 2 via a leaf spring 13 which is a spring material, and applies a force to the carriage 2 in the radial direction of the countershaft 8.

In the present invention configured as described above, the magnetic circuit 1
Due to the magnetic gap of 0 and the current of the coil 9, a driving force acts in a direction parallel to the main shaft 7 and the sub shaft 8, and the carriage 2
is driven by this driving force, the optical pickup 1 moves parallel to the optical disk surface (j not shown) and writes or reads information. At this time, the force generated in the coil 9 moves the carriage containing the optical pickup 1. A rotational moment force around the optical axis is generated due to the force exerted at a position shifted from the center of gravity of the assembly. Sliding surface 1
Since viscous friction is provided by the viscous material impregnated in 1, rotational vibrations are eliminated as much as possible.

As mentioned above, the slider 12 and the carriage 2 are connected via the leaf spring 13, and the connected state is such that the rigidity is high in the direction of movement of the carriage 2, and the rigidity is high in the direction perpendicular to the direction of movement. Because the slider 12 is weakened, the rotation of the slider 12 with respect to the sub-shaft 8 is removed and smooth movement of the carriage 2 cannot be prevented. It is easy to assemble as it is easy to assemble. Further, since ease of assembly is improved, the cross section of the slider 12 may be circular, and since the contact area with the subshaft 8 is increased, the damping effect is maximized. The viscous material impregnated into the sliding surface 11 prevents damage caused by kinetic friction between the sub@8 and the sliding surface 11 and ensures a long-term damping effect.
It becomes possible to maintain the positioning accuracy of the optical pickup l at the highest level at all times. When it comes to this viscous body,
Since it is possible to provide attenuation proportional to the moving speed of the carriage 2, an excellent attenuation effect can be achieved particularly against the high frequency interference of the carriage 2. Although silicone grease is used as the viscous material in this embodiment, other low-carbon fluorine-based lubricants may also be used. In addition, as a spring material,
As long as the pressing force is applied in the radial direction of the subshaft 8, the spring material and the method of attachment thereof are not limited to those of this embodiment.

In addition, by forming the subshaft 8 with a magnetic material i, using a magnetic fluid as the viscous material, and further fixing a magnet to the slider 12, a magnetic field is generated by the sub@8 and the magnet.
Since the magnetic fluid is restrained by this magnetic field and concentrated on the sliding surface 11, a great damping effect can be expected.

Moreover, the sliding movement may not be performed with the secondary shaft 8 but with a non-driving body such as the frame 6, for example.

Of course, even in difficult cases, by forming the sliding portion of the frame 6 with a magnetic material, a damping method using a magnetic field becomes possible.

In any of the above cases, rotational vibration around the optical axis is eliminated as much as possible, and tracking control can be started quickly. Therefore, the access time of the optical disc device can be increased.

〔Effect of the invention〕

As described above, according to the present invention, an optical disc device with faster access time is realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a carriage assembly of an optical disk device according to the present invention, FIG. 2 is a schematic diagram showing the positional relationship between the main shaft and the sub-shaft, and the main-shaft side bearing and the sub-shaft side bearing, and FIG. 3 is the main shaft. 4 is a front sectional view of the slider, FIG. 5 is a perspective view of the carriage assembly of a conventional optical disc device, and FIG. 6 is a front sectional view of the side bearing and the subshaft side bearing. 7 is a schematic diagram showing the positional relationship between the main shaft side bearing and the subshaft side bearing, and FIG. 7 is a front sectional view of the main shaft side bearing and the subshaft side bearing. Magnetic circuit (part of drive means), 11... sliding surface, 12
... Slider (part of the vibration damping means), 13... Spring material (part of the vibration damping means).

Claims (5)

[Claims] (1) An optical head for inputting and outputting information, a carriage for mounting the optical head, a driving means for driving the carriage, and a driving direction of the carriage by sliding with the carriage when driving the carriage. a main shaft that is located parallel to the main shaft at a location farther from the driving means than the main shaft and that slides on the carriage when the carriage is driven; An optical disc device comprising: vibration damping means that damps vibrations of the carriage by sliding on a shaft. (2) The optical disc device according to claim 1, wherein the vibration damping means slides on a frame that fixes the subshaft. (3) The vibration damping means has a sliding surface formed of a porous member impregnated with a viscous material, and is pressed against the subshaft in the radial direction by a spring material. The optical disc device described. (4) The optical disk device according to claim 3, wherein the portion that slides on the vibration damping means is made of a magnetic material, and a magnet is fixed to the vibration damping means. (5) The optical disk device according to claim 3, wherein the portion that slides on the vibration damping means is made of a magnetic material, a magnet is fixed to the vibration damping means, and the viscous material is a magnetic fluid.