JPS63155481A - Cassette - Google Patents

Abstract

PURPOSE:To easily remove foreign matters and to prevent the fault of an information recording and reproduction from arising from such foreign matters sticking to a lens by providing a guide hole for a removal means for removing foreign matters sticking to an optical system of a device. CONSTITUTION:A cleaning rod 12 is inserted from the guide hole 8a of a cassette 2 through a guide part 8b, and a tip part 12a of the cleaning rod 12 is reached the vicinity of an aperture 8c of the cassette. At that time a part 12b adjacent to the tip 12a of the cleaning rod 12 is bent so that the tip 12a can smoothly reach the surface 10a of an objective lens 10 from the aperture 8c. On arrival of the tip 12a of the cleaning rod 12 at the surface 10a of the objective lens 10, the cleaning rod 12 is turned, thus removing dust or other foreign matters sticking to the surface 10a to enable an information recording and reproduction to be performed again by a normal laser power onto the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette that is loaded into an information recording and reproducing apparatus that records and/or reproduces information using light as a medium.

[Conventional technology]

Generally, in an optical disk device, a width of 1-
Information pits with a length of 24s and a length of 1 to 3 μm are recorded. To read information from these information pits, first a light beam is focused onto a minute spit using an objective lens, and then irradiated onto the information pit. At this time, the reflected light or transmitted light from the recording medium changes optically depending on the presence or absence of information. By electrically detecting this change with a photodetector, a reproduced signal corresponding to the information pit can be obtained.

In such an optical disk device, it is extremely important that the minute spot always accurately scan the information pit row on the recording medium. For this purpose, auto-focusing is required to correct the focus shift caused by the tilting of the recording medium, and auto-tracking is required to correct the irradiation position shift due to eccentricity of the recording medium. As a method for realizing this autofocus function and autotracking function, there is an objective lens driving device that moves an objective lens in an autofocus direction and an autotracking direction. Since this device has a strong magnetic circuit and a bearing sliding part machined with high precision, a dustproof case is usually attached to the device to prevent dust from entering from the outside.

[Problem that the invention seeks to solve]

However, the upper surface of the objective lens and the movable range in the tracking direction are exposed as openings.

For this reason, if dust such as dust from the outside adheres to the top surface of the objective lens, especially if foreign matter adheres to the center of the lens, the laser beam with accurate laser power cannot be irradiated onto the disk surface. There was a problem in that the information was recorded and played back poorly.

〔the purpose〕

The present invention has been made in view of the problems of the prior art described above, and its purpose is to remove foreign matter such as dust adhering to the upper surface of an objective lens and to prevent the occurrence of information recording/reproducing failures. be.

[Means for solving problems]

According to the present invention, the above object is to provide a cassette that is loaded into a device that records and/or reproduces information by irradiating a light beam onto an information recording medium through an optical system; This is achieved by using a cassette, characterized in that it is provided with a hole for guiding the removal means for removing it.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the state in which the cassette 2 of the present invention is inserted into the cassette head 6 of the information recording/reproducing apparatus 4. As shown in FIG.

Inside the cassette 2, there is a disk that is an information recording medium. Further, a guide hole 8, which will be described later, is provided at the bottom of the cassette 2.

FIG. 2 is a partially cutaway perspective view showing a state in which the cassette 2 of the present invention is loaded into the information recording/reproducing apparatus 4. As shown in FIG.

As shown in the figure, the guide hole 8 is formed so that the cleaning rod 12 can pass from the bottom of the cassette 2 to the position of the objective lens 10 provided in the information recording/reproducing device 4. The cleaning rod 12 has its tip 1
A cleaning portion 2a is provided, and a portion 12b near the tip portion 12& is configured to have flexibility.

FIGS. 3(a) to 3(d) are internal side views of the information recording/reproducing apparatus 4, sequentially showing how the cassette 2 of the present invention is loaded into the apparatus.

In the figure, numeral 10 is an objective lens that focuses the radar light onto the disk. Reference numeral 14 denotes an optical head on which an objective lens 10, its driving device, and an optical unit are mounted. The optical head 14 can be displaced by a linear motor 16 in the radial direction of the disk. 18 is a spindle motor that rotates the disk. 20 is a turntable that holds and rotates the disk.

In the above configuration, foreign matter such as dirt and dust adheres to the upper surface 10a of the objective lens 10, and a light beam of normal radar power cannot be irradiated onto the disk, which is a recording medium, so that information cannot be recorded or reproduced. If this becomes impossible, a cassette 2 exclusively used for cleaning the objective lens is used as shown in FIG. Therefore, the cassette 2 is provided with a guide hole 8a at the end opposite to the end face on the cassette insertion port side.
Additionally, a guide 8b is provided extending from the hole to the inside of the cassette 2. The guide 8b has an opening 8 whose center is on the movement line of the objective lens 10 located on the lower surface of the cassette 2.
It continues to c. The cassette 2 having such a structure is inserted into the information recording/reproducing device 4 and a loading operation is performed. The cassette 2 reaches a predetermined position (FIG. 3(b)) and is lowered and fixed until it is at a predetermined distance from the turntable 20 and the objective lens 10. This state is shown in Figure 3 (
, ) is shown. Next, the optical head 4 moves from an arbitrary position A between the center of the spindle motor 18 and the center of the disk to a position B, which is the innermost data recording area of the disk (as shown in FIG. 3(d)). It is moved by the linear motor 16 in order to initialize it.

Next, as shown in FIG. 4, the cleaning rod 12 is inserted into the guide hole 8a of the cassette 2 and passed through the guide 8b, so that the tip 12 & of the cleaning rod 12 is inserted into the opening 8 of the cassette.
Reach near C. At this time, ri 17 = ng rod 12
The portion 12b near the tip 12& is bent, and the tip 12m smoothly extends from the opening 8C to the surface 1 of the objective lens 10.
This makes it possible to reach 0a.

By rotating the cleaning rod 12 at the same time that the tip 12m of the cleaning rod 12 reaches the objective lens surface 10a, the dust, dust, etc. attached to the objective lens surface 10a is removed, and a normal state is left on the recording medium. Laserno 9
This enables information to be recorded and played back by the computer once again.

In the embodiment, the tip 12 of the rod 12
The cleaning operation was carried out using only the cleaning rod 12', but the opening of the cassette was made into an elongated opening 8d covering the entire radial movement range of the optical head, as shown in FIG. 5, and the cleaning rod 12' As shown in FIG. 5, by making the tip end 12a' of the optical head 1 a cleaning part having a length approximately equal to the length of the opening 8d in the disk radial direction, the optical head 1 can be cleaned.
The cleaning operation can be performed no matter where 4 is located.

〔Effect of the invention〕

As described above in detail and concretely, according to the present invention, it is possible to easily remove foreign matter adhering to the surface of the objective lens, thereby preventing information recording/reproducing failures caused by foreign matter adhering to the lens. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which the cassette of the present invention is inserted into the cassette slot of an information recording and reproducing device, and FIG. 2 is a partially cutaway view showing the state in which the cassette of the present invention is loaded into the information recording and reproducing device. A cutaway perspective view, Figures 3 (,) to (d) are side views sequentially showing how the cassette is loaded into the information recording/reproducing device, and Figure 4 is a cleaning rod inserted into the guide hole of the cassette and the objective lens FIG. 5 is a side view showing another embodiment of the present invention. 2: Cassette, 4: Information recording and reproducing device, 8 guide holes,
10: Objective lens, 12: Cleaning rod.

Claims (1)

[Claims] (1) In a cassette that is loaded into a device that records and/or reproduces information by irradiating a light beam onto an information recording medium through an optical system; the cassette is cleaned of foreign matter that has adhered to the optical system of the device. A cassette, characterized in that it is provided with a hole for guiding a removal means.