JPH07235063A - Device for feeding optical pickup - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to reduce the space by guiding an optical pickup with a guide projecting part and energizing with a pressing part when the optical pickup is fed in the direction of feeding. CONSTITUTION:Linear motors 14, 16 are provided with fixed parts 14a, 16a respectively, and this device is constituted so that movable parts 14b, 16b are movable for the fixed parts 14a, 16a by supplying power. In such a feeding device for the optical pickup, by controlling the linear motors 14, 16, the optical pickup 20 together with a carriage 22 are tracked or sought for an optical disk along the arrow X direction. At this time, the carriage 22 is fed precisely in the direction of the arrow X making the main guide 10 side a reference of movement while being pressed to the main guide 10 side by the preload from the sub-guide 12 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup used for recording and reproducing information on an optical recording medium such as a magneto-optical disk or reproducing information recorded on the optical recording medium. The present invention relates to a feeding device of an optical pickup for feeding.

[0002]

2. Description of the Related Art An optical pickup O of this kind shown in FIG.
P operates in the direction of arrow X with respect to a disk D such as a magneto-optical disk. The optical pickup OP includes an objective lens 1 and, for example, a biaxial actuator (not shown) for driving the objective lens 1 in the tracking direction and the focus direction.

Carriage 2 of this optical pickup OP
Roller parts 3 and 4 such as bearings are provided in the. The rollers 3 and 4 are for guiding the carriage 2 in the feed direction arrow X along a round bar-shaped guide shaft.
A conventional guide structure for such a carriage 2 has a structure as shown in FIG. 8 or FIG.

In the conventional example of FIG. 8, a spring 6 is provided for the carriage 2. A roller portion 3 is attached to this spring, and a roller portion 4 is attached to the carriage 2. This spring 6 causes the roller portion 3 to move the guide shaft 5
Is biased in the arrow S direction. As a result, the carriage 2 is guided along the guide shaft via the roller portion 3 and the roller portion 4 of the carriage 2. In the conventional example shown in FIG. 9, the guide shaft 5 uses the spring 16 to move the carriage 2
The rollers 3 and 4 are urged in the direction of arrow T.

[0005]

However, as shown in FIG. 8 and FIG.
In the conventional feeding device for the optical pickup, the spring 6 or the spring 16 preloads the carriage 2 side. In either case, the spring and the guide shaft are separate entities. Therefore, it is difficult to set a conventional feeding device in terms of space and cost is high in accordance with the demand for thinning and downsizing of the optical disc device.

Therefore, the present invention has been made in order to solve the above problems, and in response to the thinning and downsizing of an optical disk device, the number of parts can be reduced to reduce the space.
Moreover, it is an object of the present invention to provide a feeding device for an optical pickup that can reduce the cost.

[0007]

According to the present invention, the above object is to provide an optical system for recording and reproducing information on an optical recording medium or an optical pickup used for reproducing information on an optical recording medium. A pickup feeding device, a first guide member for guiding the optical pickup along a feed direction, and a guide device arranged parallel to the first guide member to guide the optical pickup along the feed direction. A second guide member formed in a plate shape for the purpose of having a guide protrusion for guiding the optical pickup in the feed direction and providing a biasing force to the optical pickup side. Second guide means having
This is achieved by a feeding device of the optical pickup, which comprises a driving means for moving the optical pickup in the feeding direction.

In the present invention, preferably, the first guide member and the second guide member are arranged on one substrate. Further, in the present invention, preferably, the optical pickup is held by a carriage, and the carriage has a roller that runs on a guide protrusion of the second guide member. Further, in the present invention, preferably, the guide protrusion of the second guide member has a semicircular cross section.

In the present invention, preferably the drive means is a linear motor. Then, in the present invention, preferably, the linear motors are respectively arranged on the first guide member side and the second guide member side,
The moving part of the linear motor is attached to the optical pickup side.

[0010]

According to the above construction, the optical pickup is guided in the feeding direction by the first member and the second member by driving the driving means. During this guidance, the optical pickup is guided by the guide protrusion and the optical pickup is biased by the biasing portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIG. 1 is an exploded perspective view showing a preferred embodiment 1 of the optical pickup feeding device of the present invention. FIG. 2 is a perspective view showing a part of a preferred embodiment 1 of the optical pickup feeding device of the present invention. 1 and 2, the feeding device of the optical pickup is also referred to as a feed shaft mechanism of the optical pickup, and includes a first guide member 10 and a second guide member 1.
2. Driving means 14, 16 and optical pickup 20
And its carriage 22, and a chassis 30 as a substrate.

First, the optical pickup 20 and its carriage 22 will be described. As shown in FIGS. 1 and 2, the optical pickup 20 includes an objective lens 40 and a biaxial actuator 42 for driving the objective lens 40 in the focus direction FCS and the tracking direction TRK. This optical pickup 20 includes a carriage 2
It is held in the inside 22a of the second. This carriage 22
Is rectangular or square when viewed from above.

The optical pickup 20 irradiates the optical disc D with laser light, for example, and receives the reflected light. The biaxial actuator 42 causes the objective lens 40 that focuses the light emitted from a light source such as a semiconductor laser to be a signal source of the optical disk D, to focus direction FCS and tracking direction T by a magnetic driving force.
By displacing the laser beam in the biaxial directions of RK, the laser beam can be focused on the signal surface of the optical disc D and accurately applied along the recording track.

As a result, the signal surface of the optical disc D can be irradiated with light to read the information signal recorded on the optical disc D or to write information on the optical disc.

Two pairs of rollers 60, 62 are rotatably attached to one end 50 of the carriage 22. Similarly, two pairs of roller portions 70 and 72 are rotatably attached to the other end portion 52 of the carriage 22. These roller portions 60, 62 and 70, 72 are arranged in different directions at a predetermined angle as shown in FIG. For these roller portions, for example, a bearing or the like can be adopted.

Next, the first guide member 10 will be described. The first guide member 10 is a round rod-shaped guide shaft, and is a main shaft guide serving as a reference side. Both ends of the spindle guide 10 are preferably fixed to the chassis 30.

Next, the second guide member 12 will be described. The second guide member 12 is a counter shaft guide. As shown in FIG. 2, the sub shaft guide 12 is fixed to the mounting portions 80 and 82 of the chassis 30 with screws 81 and 81. The counter shaft guide 12, and particularly the guide protrusion 86 thereof, is parallel to the main shaft guide 10.

The counter shaft guide 12 is made by molding a plate-shaped material such as metal or resin, and has a mounting portion 8
4, 84, a biasing portion 87, and a guide protrusion 86. The guide protrusion 86 is formed long between the mounting portions 84, 84. As shown in FIG. 3, the cross section of the guide protrusion 86 has a substantially semicircular cross section or a substantially semicylindrical shape. The biasing portion 87 of the counter shaft guide 12
Has a spring property based on the mounting portions 80 and 82. As a result, in the state in which the counter shaft guide 12 is attached to the chassis 30 as shown in FIG. 2, the roller portions 70, 72 can be preloaded along the preload direction Z as shown in FIG. It is like this. Therefore, preload is applied to the carriage 22 from the auxiliary shaft guide 12 via the roller parts 70 and 72, so that the roller parts 60 and 62 are pressed against the main shaft guide 10.

Next, the driving means 14, 1 shown in FIG. 1 and FIG.
6 is preferably a linear motor. The linear motors 14 and 16 include fixed portions 14a and 16a, respectively. By energizing, the fixing portions 14a, 16
The movable parts 14b and 16b are movable with respect to a. The movable portion 14b is attached to the carriage 22 with the screw 9
It is fixed by 0. On the other hand, the movable part 16b
Are fixed to the carriage 22 with screws 91.

Through holes 14c and 16c are formed in the movable portions 14b and 16b, respectively. The counter shaft guide 12 passes through the through hole 14c. Further, the spindle guide 10 passes through the through hole 16c. As a result, there is no fear that the movable portion 14b and the movable portion 16b interfere with the auxiliary shaft guide 12 and the main shaft guide 10. In such an optical pickup feeding device, by controlling the linear motors 14 and 16, the optical pickup 20 together with the carriage 22 can be tracked or seeked with respect to the optical disc D along the arrow X direction. In this way, when the carriage 22 and the optical pickup 20 are sent in the direction of the arrow X, the carriage 22 is moved by the spindle guide 10.
The side can be accurately fed in the arrow X direction while being pressed against the main shaft guide 10 side by the preload from the auxiliary shaft guide 12 side with the side as the reference side of movement.

Embodiment 2 Next, FIG. 4 shows another preferred embodiment 2 of the optical pickup feeding device of the present invention. Second of the second embodiment
The auxiliary shaft guide 112, which is a guide member of the
6 and a mounting portion 184 located on both sides thereof, and a biasing portion 200. Four notches 202 are formed between the mounting portion 184 and the guide protrusion 186. The biasing portion 200 includes the cutout portion 202 and the intermediate portion 20.
It consists of 1. By providing this urging portion 200, preload can be exerted on the roller portion of the carriage in the same manner as the first embodiment of FIGS. 1 and 2.

Also in this second embodiment, the guide protrusion 186 is provided.
Has, for example, a substantially semicircular cross section. Further, the auxiliary shaft guide 112 is formed in a plate shape by molding a plate-shaped material such as metal or resin as in the first embodiment.

Example 3 Next, please refer to FIG. 5 and FIG. 5 and 6 show a further preferred embodiment 3 of the feeding device of the optical pickup according to the present invention. The counter shaft guide 212 as a second guide member shown in FIGS. 5 and 6 has a guide protrusion 286 and a biasing portion 290 formed along the feeding direction X.

The guide protrusion 286 is also formed in the first embodiment shown in FIG.
As in Example 2 shown in FIG. 4, the cross section has a substantially semicircular shape. In the third embodiment, the mounting portion 284 is formed long along the feeding direction X, and the guide protrusion 28
6 is formed on the urging portion 290 and the attachment portion 284.
Has a substantially L-shaped cross section. This counter shaft guide 2
The preload generated from the urging unit 290 of 12 is the arrow Z
It is provided to the carriage 22 via the rollers 70 and 72 so as to rotate in the direction.

As described above, in the embodiment of the feeding device for the optical pickup according to the present invention, the plate-shaped second guide member (sub-shaft guide) in which the guide protrusion for feeding the carriage and the biasing portion are integrated with each other. ) Is used, the number of parts is reduced and the size can be reduced as compared with the conventional one using a guide shaft and a spring. Therefore, miniaturization of the optical disk device can be dealt with.

The present invention is not limited to the above embodiment. The guide protrusion of the counter shaft guide, which is the second guide means, is not limited to having a semicircular cross section, and may have, for example, a triangular cross section. Further, in the optical pickup, an optical part including an objective lens is integrated with a biaxial drive part for driving the objective lens, or an optical part is separate from the biaxial drive part. There is.

Further, in the embodiment, an example in which it is applied to an optical disk device for recording / reproducing a magneto-optical disk is shown, but this optical disk device can be used as a data streamer, for example. Further, the feeding device of the present invention is, for example, a CD, a CD-ROM, or an optical disc.
It can also be applied to MD and the like.

[0029]

As described above, according to the present invention, it is possible to reduce the number of parts, reduce the space, and reduce the cost in response to the thinning and downsizing of the optical disk device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first preferred embodiment of a feeding device for an optical pickup according to the present invention.

FIG. 2 is a perspective view showing a part of the first embodiment shown in FIG.

FIG. 3 is a diagram showing a carriage, a roller portion, a first guide member, and a second guide member in the first embodiment of FIG.

FIG. 4 is a perspective view showing a second embodiment of the optical pickup feeding device of the present invention.

FIG. 5 is a perspective view showing a third embodiment of an optical pickup feeding device of the present invention.

FIG. 6 is a carriage, a roller portion, and the like in Embodiment 3 of FIG.
The figure which shows a 1st guide member, a 2nd guide member, etc.

FIG. 7 is a perspective view showing a conventional optical pickup, a guide shaft, rollers and the like.

FIG. 8 is a view showing an example of a conventional optical pickup feeding device.

FIG. 9 is a diagram showing an example of another conventional optical pickup feeding device.

[Explanation of symbols]

 10 1st guide member (main shaft) 12 2nd guide member (sub shaft) 14, 16 Linear motor (driving means) 20 Optical pickup 22 Carriage 30 Chassis (substrate) 40 Objective lens 60, 62, 70, 72 Roller part

Claims (6)

[Claims] 1. An optical pickup feeding device for feeding an optical pickup used for recording / reproducing information on / from an optical recording medium or for reproducing information on an optical recording medium, the optical pickup being arranged in a feeding direction. A first guide member for guiding the optical pickup, and a second guide member arranged in parallel with the first guide member and formed in a plate shape for guiding the optical pickup along the feeding direction. A second guide member having a guide protrusion for guiding the optical pickup in the feed direction and having a biasing portion for applying a biasing force to the optical pickup side; and the optical pickup in the feed direction. And a driving unit for moving the optical pickup to the optical pickup. 2. The optical pickup feeding device according to claim 1, wherein the first guide member and the second guide member are arranged on one substrate. 3. The optical pickup according to claim 1, wherein the optical pickup is held by a carriage, and the carriage has a roller that runs on a guide protrusion of the second guide member. Feeder. 4. The guide protrusion of the second guide member has a semicircular shape in cross section.
The optical pickup feeding device according to any one of 1. 5. The optical pickup feeding device according to claim 1, wherein the driving unit is a linear motor. 6. The linear motors are respectively arranged on the first guide member side and the second guide member side,
The optical pickup feeding device according to claim 5, wherein the moving portion of the linear motor is attached to the optical pickup side.