JPH03222124A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need of a mechanism dedicated to cleaning and to simplify the cleaning mechanism by providing an objective lens cleaning brush to a shutter opening and closing lever. CONSTITUTION:When a disk cartridge 1 is inserted in the cartridge insertion port 3a of an optical disk drive 3, the tip part 4a of the shutter opening and closing lever 4 is made to abut on the notched part 2a of the shutter 2 of the cartridge 1 and the lever 4 is rotated centering around a supporting point 4b to open a shutter 2. Thus, the cleaning brush 5 provided on the tip part of the lever 4 turns in the same way as the lever 4 and passes in contact with the upper surface of an objective lens 6. Therefore, a foreign matter such as dust stuck to the lens 6 is removed. The above action occurs not only at the time of loading the cartridge 1 but also at the time of ejecting it, thereby perfectly cleaning the lens 6.

Description

[Detailed description of the invention]

[Industrial Field of Application] In order to write and reproduce information on a medium using a laser beam, the present invention enables high-density information recording by making the spot diameter of the laser beam on the medium surface into a minute spot with a diameter of about 1 to 3 μm. The present invention relates to an optical information recording and reproducing device that performs the above operations, and particularly relates to an optical system cleaning device that cleans the surface of an objective lens that converges and moves the laser beam on a medium surface in such a device. Note that the optical information recording/reproducing device in the present invention is a device that records and/or reproduces information. [Prior art] Conventional information recording media (hereinafter referred to as disks) are
As shown in the figure, it is housed in a disk cartridge 46 to protect it from dust and the like. This disk cartridge 46 is equipped with an opening 44 for exposing the stored disk to the outside when necessary, such as during recording and/or reproduction, and an openable/closable shutter that closes the opening except when necessary. When optically recording and/or reproducing information on a disc housed in such a disc cartridge 46, the disc cartridge 46 is first inserted into an optical information recording/reproducing apparatus through an insertion slot. The inserted disk cartridge 46 comes into contact with a shutter opening/closing lever 41 provided inside the device as shown in FIG. The recessed portions 42b provided therein are in a state of engagement with each other. After that, when the page is continued to be inserted, the shutter opening/closing lever 41 slides along the guide path 43 in the engaged state, and as a result, the shutter opens on the fourth page.
The disc cartridge 46 is opened as shown in FIG. 4B, and the disc 47 is exposed through the opening 44 of the disc cartridge 46. Incidentally, when the disc is ejected, the opposite operation is performed. By modulating and irradiating the disk 47 exposed in this way with a laser beam focused on a minute spot by an objective lens, a width of 1 to 2 μm is formed on the disk.
To record information by forming information bits with a length of 1 to 3 μm and to read information from the information bits, first, a light beam is focused on a minute spot by an objective lens and is irradiated onto the information bits. 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 bit is obtained. Incidentally, when recording and reproducing such information, laser light irradiation and detection of reflected light or transmitted light are performed by an optical head. Furthermore, in such an optical information recording/reproducing device, it is extremely important that the minute spot always accurately scan the information bit string on the recording medium. For this reason, the optical head is required to have an autofocus function that corrects the focus shift caused by the warping of the recording medium, and an autotracking function that corrects the irradiation position shift caused by the eccentricity of the recording medium. As a method for realizing this autofocus function and autotracking function, there is an optical head that includes an objective lens drive device that moves an objective lens in an autofocus direction and an autotracking direction. This device has a strong magnetic circuit and a bearing sliding part that is machined with high precision, so in order to prevent dust from entering from outside,
A dustproof case is attached.

[Problem to be solved by the invention]

However, in conventional devices, in order not to obstruct the optical path of the laser beam, the dustproof case is provided with an opening that exposes the objective lens to the outside, so that dust such as dirt from the outside easily adheres to the objective lens. As a result, it becomes impossible to irradiate a laser spot with accurate laser power onto the disk surface, resulting in problems in recording and reproducing information. [Means for Solving the Problems] The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical information recording/reproducing device that does not cause information recording/reproducing defects. , stores an information recording medium, and records and/or records a part of the information recording medium.
or information exposed through an opening and closing mechanism that opens and closes the shutter and the opening that is opened by the opening and closing mechanism when a cartridge is inserted and ejected, the cartridge having an opening to be exposed during playback and a shutter that can be opened and closed to close the opening. An optical information recording and reproducing device that records and/or reproduces information by irradiating a recording medium with a laser beam formed in a minute spot using an objective lens, and includes an optical head equipped with the objective lens. A cleaning member is provided on the opening/closing mechanism, and the cleaning member cleans the objective lens of the optical head in conjunction with the operation of the opening/closing mechanism. Details will be explained in Examples below. [Examples] Examples of the present invention will be described below with reference to the drawings. 1 to 3 are diagrams showing embodiments of the present invention. l is a disc cartridge that protects discs for normal recording and playback. 2 is a shutter that exposes the disk during use; 3 is an optical information recording/reproducing device; 4 opens the shutter 2 provided on the disc cartridge L in synchronization with the rotary ejection of the disc cartridge.
The shutter opening/closing lever 5 to be closed is a cleaning brush provided at the tip of the shutter opening/closing lever 4,
Flocked with ultra-fine polyester or nylon bristles. Reference numeral 6 denotes an objective lens for condensing a laser beam onto the recording/reproducing disk, and 7 an optical head for seeking in the radial direction of the disk by a linear motor 8. 9 is a turntable for fixing the disk; 10 is a spindle motor for rotating the disk; In the above configuration, the disk cartridge l is inserted into the cartridge insertion slot 3 of the optical disk drive 3 as shown in FIG.
When it is funneled from point a, the tip 4a of the shutter opening/closing lever 4 is pressed and joined to the notch 2a of the shutter 2 of the disk cartridge 1, as shown in FIGS. 1 and 2 (1). The shutter opening/closing lever 4 rotates around the rotation center 4b along the trajectory shown by the broken line in 1), and the shutter 2 opens. At that time, the shutter opening/closing lever 4
A cleaning brush 5 provided at the tip of the lens rotates in the same manner as the shutter opening/closing lever 4 and passes over the upper surface of the objective lens 6. At this time, as shown in FIG. 2(2), the tip of the cleaning brush 5 moves while contacting the upper surface of the objective lens 6 to remove foreign matter such as dust attached to the objective lens. The same operation as the cleaning operation described above when loading a disk cartridge (the direction of movement of the cleaner is opposite) is also performed when ejecting the disk cartridge. The linear motor 8 moves the optical head 7 so that the objective lens 6 of the optical head 7 is positioned on the movement locus of the clean brush 5 when loading and ejecting a disk cartridge. In the case of this embodiment, the optical head 7 is positioned at a distance A distance from the rotation axis of the spindle motor 10 during loading and ejecting. Incidentally, such movement control of the linear motor 8 is performed by C (not shown).
This is performed based on the detection of a load/eject operation by the PU. [Effects of the Invention] 1) As explained above, by providing the objective lens cleaning brush on the shutter opening/closing lever, the objective lens is cleaned periodically every time a disk cartridge is loaded or ejected, and dirt on the objective lens is removed. This eliminates failures of optical disk drives caused by problems, resulting in a highly reliable optical information recording and reproducing device. 2) A cleaning member is provided on the shutter opening/closing lever,
By performing cleaning in the same movement, a dedicated mechanism for cleaning is not required, and the cleaning mechanism can be simplified.

[Brief explanation of drawings]

FIG. 1 is a top view showing an embodiment of the present invention. FIG. 2 is a side view showing an embodiment of the present invention. FIG. 3 shows an optical information recording/reproducing apparatus according to the present invention. FIG. 4 is a diagram illustrating a conventional device. 1...Disk cartridge 2...shutter 4...Shutter opening/closing lever 5...Brush 6...Objective lens 7... Optical head 8...Linear motor (7) I figure (2)〈3/Y vine open loli 4〉 Ni V ivy (CL) (b)

Claims (1)

[Claims] (1) With the insertion and ejection of a cartridge that houses an information recording medium and has an opening that is exposed during recording and/or reproduction of a part of the information recording medium and a shutter that can be opened and closed to close the opening, An opening/closing mechanism that opens and closes the shutter, and a laser beam formed in a minute spot using an objective lens are irradiated onto the information recording medium exposed through the opening opened by the opening/closing mechanism, thereby recording and recording information. or an optical information recording and reproducing device equipped with an optical head equipped with the objective lens that performs reproduction, the apparatus further comprising a cleaning member provided on the opening/closing mechanism, the cleaning member being interlocked with the operation of the opening/closing mechanism. An optical information recording/reproducing apparatus characterized in that the objective lens of the optical head is cleaned by cleaning the objective lens of the optical head.