JPH0785612A - Optical recording / reproducing device - Google Patents

Abstract

PURPOSE:To obtain an optical recording/reproducing device capable of making the device thinner. CONSTITUTION:In the optical recording/reproducing device for recording/ reproducing the information of optical disks 11 such as a compact disk and magneto-optical disk, the constitution is made in such a manner that a lens 15 of the optical head 16 for reproducing the information of the optical disk 11 is moved to the outer side than the outside diameter of the optical disk 11 along a guiding shaft 17. By this arrangement, the need to source the distance for evading the contact between the optical disk 11 and the lens 15 is eliminated at the time of insertion or ejection of the optical disk 11, then the device is attained to the thinner type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for recording / reproducing information on / from an optical disc such as a compact disc or a magneto-optical disc.

[0002]

2. Description of the Related Art In recent years, optical recording / reproducing devices have been made smaller and thinner like computer devices, OA devices and the like. The conventional optical recording / reproducing apparatus will be described below. FIG. 5 is a main configuration diagram of a conventional optical recording / reproducing apparatus. In the figure,
Reference numeral 1 is an optical disk, 2 is a cartridge for accommodating the optical disk 1, and 3 is a turntable on which the optical disk 1 is mounted and rotated. A positioning projection 3a is provided at the center and a magnet 3b is provided around the projection. Reference numeral 4 is a spindle motor for driving the turntable 3, 5 is a lens for converging the laser light applied to the optical disk 1, 6 is an optical head for reproducing information on the optical disk 1 by using this lens 5, and 7 is an optical head. It is a guide shaft for guiding the head 6 in the radial direction of the optical disc 1. The optical head 6 is moved in the radial direction of the optical disc 1 by moving means (not shown).

6 and 7 are detailed views of the cartridge 2 of the conventional optical recording / reproducing apparatus, both viewed from the turntable 3 side. The cartridge 2 is provided with a shutter 8 for protecting the disc when not in use,
FIG. 6 shows the shutter 8 opened, and FIG. 7 shows the shutter 8
Indicates a closed state.

As shown in FIG. 6, a positioning hole 1a is provided in the center of the optical disk 1, and a hub 1b made of a ferromagnetic metal disk is attached around the hole 1a. The hole 1a and the projection 3a of the turntable 3 described above are fitted to each other, the optical disc 1 is positioned on the turntable 3, and the optical disc 1 is mounted on the turntable 3 by the attractive force of the magnet 3b and the hub 1b. The cartridge 2 is provided with an opening 9 so that a part including the center of the optical disc 1 is exposed. This opening 9 is
It extends from the central portion 9a of the optical disc 1 to the end surface 9b on the insertion side into the apparatus body. From the opening 9, the above-described optical head 6
And the turntable 3 can approach the optical disc 1.

The operation of the optical recording / reproducing apparatus configured as described above will be described below. 8 and 9,
FIG. 10 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus. FIG. 8 shows a main body 10 in which a cartridge 2 accommodating an optical disk 1 is mounted.
The cartridge 2 is being inserted into the main body 10 or is being ejected from the main body 10. The cartridge 2 is inserted into the main body 10 through the insertion opening 10a. Figure 9
The cartridge 2 is completely stored inside the main body 10,
It shows a state where the center of the optical disk 1 and the center of rotation of the turntable 3 are substantially coincident with each other. In the insertion process shown in FIGS. 8 and 9, a distance D1 of about 1 mm is secured so that the lens 5 and the optical disc 1 do not come into contact with each other. Next, FIG.
As shown in FIG. 3, the turntable 3 and the spindle motor 4 are driven toward each other by the drive means (not shown) toward the optical disc 1, and the optical disc 1 is connected to the hub 1b and the turntable 3 by the drive means (not shown).
It is mounted on the turntable 3 by the magnetic attraction force of the magnet 3b. At this time, the optical disc 1 is raised by the turntable 3 by the distance D2.

The upward movement of the optical disk 1 will be described with reference to the operation explanatory diagrams of the conventional optical recording / reproducing apparatus shown in FIGS. 11 and 12 show the turntable 3 of the optical disc 1.
It shows the state before and after the attachment, and is a view seen from the side of the insertion port 10a, respectively. In FIG. 11, the optical disc 1 is in contact with the protrusion 2 a of the cartridge 2. The turntable 3 rises from below the optical disc 1 to mount the optical disc 1, but the optical disc 1 and the turntable 3 have surface wobbling.
In order to avoid contact between the inner surface of the cartridge 2 and the inner surface of the cartridge 2, the optical disk 1 is lifted by the distance D2, and the cartridge 2
Must secure a distance from the inner surface of. Usually distance D
2 is about 1 mm.

As a result, the distance between the lens 5 and the optical disk 1 becomes D1 + D2 (≈2 mm). After that, the optical disk 1 is rotated together with the turntable 3 by a spindle motor 4, and the optical head 6 is guided by a guide shaft 7 and driven by a drive source (not shown) to move to a desired position on the optical disk 1. Then, by irradiating the optical disk 1 with laser light from the lens 5, the optical head 6 reproduces the information recorded on the optical disk 1.

[0008]

However, in the above-mentioned conventional configuration, it is necessary to secure the distance D1 in order to avoid contact between the optical disc 1 and the lens 5 when the optical disc 1 is inserted or ejected, and the device is thin. However, there was a problem that it hindered the commercialization.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an optical recording / reproducing apparatus which can be made thinner.

[0010]

In order to achieve this object, in the optical recording / reproducing apparatus of the present invention, the lens of the optical head for converging the laser light on the optical disc has an outer diameter of the optical disc along the guide means. It is designed to move to the outside.

[0011]

With the above structure, it is not necessary to secure a distance for avoiding contact between the optical disc and the lens when the optical disc is inserted or ejected, and the device can be made thin.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a main configuration diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention. 2 is an explanatory view of the same operation, and is a side view of the optical recording / reproducing apparatus shown in FIG.

In FIGS. 1 and 2, 11 is an optical disk, 11b is a hub made of a ferromagnetic metal disk provided at the center of the optical disk 11, and 12 is a cartridge for housing the optical disk 11. Reference numeral 13 is a turntable for mounting and rotating the optical disk 11. Although not shown in the figure, a positioning projection is provided at the center and a magnet is provided around the projection as in the conventional example. Reference numeral 14 is a spindle motor for driving the turntable 13, 15 is a lens for converging the laser light applied to the optical disk 11, 16 is an optical head for reproducing information on the optical disk 11 using this lens 15, and 17 is an optical head 16 Is a guide shaft for guiding the optical disk 11 in the radial direction of the optical disk 11, and 18 is a main body of the apparatus. The optical head 16 is driven by a moving unit (not shown) to move to a desired position in the radial direction of the optical disk 11 along the guide shaft 17, and its moving range is a turntable as shown by a broken line in the figure. The lens 15 extends to the outside of the outer diameter of the optical disc 11 when viewed from the direction of the center of rotation of the optical disc 13. Also, the optical head 1
A distance D2 is secured between the lower surface of 6 and the lower surface of the optical disk 11.

The operation of the optical recording / reproducing apparatus configured as described above will be described with reference to the operation explanatory diagrams of the optical recording / reproducing apparatus shown in FIGS. In FIG. 2, the optical disk 11 is completely housed in the main body 18, and the turntable 13 is
It is shown mounted on the. In addition, FIG.
The cartridge 12 having the optical disk 11 housed in the main body 1
FIG. 4 shows a state where the cartridge 12 is being housed in the main body 18, and the cartridge 12 is completely housed in the main body 18.
At the position where the center of 1 and the center of the turntable 13 almost coincide with each other, the optical disk 11 is not yet mounted on the turntable 13. The operation sequence is shown in FIGS. 3, 4, and 2.

In FIGS. 3 and 4, the optical head 16 stands by at a position outside the outer diameter of the optical disk 11, and the distance between the lower surface of the optical disk 11 and the lens 15 is not secured. As shown in FIG. 9, the distance D1 is secured in the conventional example. Now, the turntable 13 and the spindle motor 14 rise from the state of FIG. 4, the optical disk 11 is mounted on the turntable 13 as shown in FIG. 2, and moves to a position raised by a distance D2. After that, the optical disk 11 is driven to rotate integrally with the turntable 13 by the spindle motor 14, and the optical head 16 is guided by the moving means (not shown).
The optical head 16 reproduces the information recorded on the optical disk 11 by moving to a desired position on the lower surface of the optical disk 11 along 7 and irradiating the optical disk 11 with laser light from the lens 15.

When the optical disk 11 is ejected, the operation shifts in the reverse order of FIG. 2, FIG. 4 and FIG. That is, first, in FIG. 2, the optical head 16 is the optical disc 1
Along the guide shaft 17 to the outside of the outer diameter of 1,
At the same time, the rotation of the spindle motor 14 stops,
Thereafter, the turntable 13 and the spindle motor 14 descend, the optical disc 11 is separated from the turntable 13 (see FIG. 4), and the optical disc 1 is further operated by means not shown.
The cartridge 12 containing 1 is ejected from the main body 18 (see FIG. 3). As described above, according to this embodiment, the distance D1 for avoiding the contact between the optical disc 11 and the lens 15 when the optical disc 11 is inserted or ejected.
It is not necessary to secure (≈1 mm), and the entire device can be made thinner accordingly.

[0017]

As described above, in the optical recording / reproducing apparatus of the present invention, the lens is configured to move along the guide means to the outside of the outer diameter of the optical disc, so that when the optical disc is inserted or ejected. Therefore, it is not necessary to secure a distance for avoiding contact between the optical disc and the lens, and the device can be thinned accordingly, and a compact optical recording / reproducing device can be realized.

[Brief description of drawings]

FIG. 1 is a main configuration diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 5 is a main configuration diagram of a conventional optical recording / reproducing apparatus.

FIG. 6 is a detailed view of a cartridge of a conventional optical recording / reproducing apparatus.

FIG. 7 is a detailed view of a cartridge of a conventional optical recording / reproducing device.

FIG. 8 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus.

FIG. 9 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus.

FIG. 10 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus.

FIG. 11 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus.

FIG. 12 is an operation explanatory diagram of a conventional optical recording / reproducing apparatus.

[Explanation of symbols]

 11 optical disk 13 turntable 14 spindle motor 15 lens 16 optical head 17 guide shaft

Claims (1)

[Claims] 1. A lens for converging a laser beam on an optical disk, an optical head for reproducing information on the optical disk using this lens, a turntable for mounting and rotating the optical disk, and a spindle motor for driving the turntable. And guide means for guiding the optical head in a direction traversing the information track of the optical disk, and the lens is moved along the guide means to an outside of the outer diameter of the optical disk. Optical recording / reproducing device.