JP2006079719A - Dust prevention structure for optical pickup and optical disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust or the like from intruding into an objective lens, by covering the objective lens of an optical pickup with a simple structure, when the optical pickup is stopped at the stop position. <P>SOLUTION: The optical disk drive device 10 includes: the optical pickup 13 provided with the objective lens 13e for concentrating a laser light ray onto an optical disk 12 to perform the irradiation therewith; a means for moving and fixing the optical pickup 13 to a prescribed position outside the optical disk 12 when the optical pickup 13 is stopped; and a dust prevention means 14 for covering the objective lens 13e of the optical pickup 13 moved to the prescribed position to perform the dust prevention. The dust prevention means 14 is composed of an abutment plate 14b against which the optical pickup 13 abuts, a lid plate 14a integrally turned with the abutment plate 14b around a rotational axis 14c, and a resilient member 14d for biasing the abutment plate 14b so that the lid plate 14a is directed upward. When the optical pickup 13 presses the abutment plate 14b, the lid plate 14a is pressed down to cover the objective lens 13e. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dustproof structure of an optical pickup and an optical disc drive apparatus, and more particularly to improvement of emission power deterioration of a pickup section due to dust in a recording type optical disc drive apparatus.

  2. Description of the Related Art Conventionally, in an optical disk drive device, a laser is measured in an optical pickup, and an optical sensor measures a part of reflected light of the emitted laser and controls so that the sensor output becomes a desired value. The light emitted from the laser passes through the collimating lens and becomes parallel light. The light is divided by a beam splitter into light that goes to the objective lens side of the optical pickup and light that enters the optical sensor. The laser drive circuit is controlled so that the light monitored by the optical sensor becomes a reference value or a desired value, and power control is automatically performed. It should be noted that the laser output power is a reference value. What is important is to set the laser power focused by the objective lens and reaching the recording / reproducing layer of the optical disk to a reference value or a desired value.

  In the conventional optical pickup, in order to control the optical power to be constant, an optical sensor is provided on the side of the beam splitter to control the laser emission light to be a reference value. When using an optical disk drive, naturally, dirt, dust, dust, etc. accumulate on the objective lens due to dust floating in the air, and the optical power on the optical disk, that is, the optical power reaching the recording / reproducing layer of the optical disk is the reference value. It becomes difficult to keep it.

  When a long-term dust test is performed, the place where dust and dust accumulate is where there is a step in the drive or where the objective lens section reaches the optical system of the optical pickup. According to the results of the dust test, it was found that dust and dirt floating in the air enter the objective lens and the optical system with the objective lens portion as the entrance when left standing. Although the optical power of the optical sensor is the reference value due to the influence of dust on the objective lens, the amount of light after passing through the objective lens is considerably reduced, resulting in serious deterioration of the playback function and recording failure due to insufficient recording power. It may cause a sufficient or insufficient recording margin.

On the other hand, for example, Patent Document 1 discloses an apparatus that reliably prevents dust from adhering to the objective lens and prevents dust from entering the optical block. This is because a cover plate is provided to cover the through-hole of the lid that covers the objective lens of the optical pickup unit when the optical pickup unit moves to the outer position of the optical disk, and either the lid or the cover plate is provided. An operation unit is provided for moving the cover plate in a direction away from the objective lens. When the optical pickup unit moves to the outer position, the cover plate is moved away from the objective lens by the operation unit, so that the cover plate covers the objective lens while avoiding contact with the objective lens. It is a thing.
JP 2000-298863 A

  However, the invention described in Patent Document 1 has a structure in which a protrusion is provided on the cover of the optical pickup, and an engagement hole for engaging with the protrusion is provided in the cover plate to cover the objective lens. Therefore, when the optical pickup comes into contact with / detaches from the cover plate, a force is applied from the cover plate to the optical pickup, which may become a resistance and hinder smooth movement of the optical pickup. Moreover, since the cover plate contacts and engages the lid, the lid may be damaged.

  The present invention has been made in view of the above circumstances, and when the optical pickup is stopped at the stop position, the objective lens of the optical pickup is covered with a simple structure so as to float and fall in the air. An object of the present invention is to provide a dust-proof structure for an optical pickup that prevents incoming dust and the like from entering an objective lens, and an optical disk drive device having the dust-proof structure.

  In order to solve the above-mentioned problem, the first technical means of the present invention includes an optical pickup provided with an objective lens for condensing and irradiating a laser beam on an optical disk rotatably held by a spindle motor, Means for moving the optical pickup in the radial direction of the optical disk, and moving and fixing the optical pickup to a predetermined position outside the optical disk when not in use, and a lid on the objective lens of the optical pickup moved to the predetermined position In the dust-proof structure of the optical pickup having the dust-proof means for preventing dust, the dust-proof means includes a contact plate with which the optical pickup contacts, and a cover plate that rotates integrally around the contact plate and the rotation shaft And an elastic member that urges the contact plate to direct the lid plate upward, and the optical pickup moves to the predetermined position and pushes the contact plate. Occasionally, is obtained by, characterized in that said cover plate is dustproof with a lid on the objective lens is pressed downward.

  According to a second technical means, in the first technical means, at least the cover plate is made of the same material as an objective lens cover for covering the periphery of the objective lens.

  According to a third technical means, in the first or second technical means, a brush is provided at a tip of the lid plate, and the brush is attached so as to contact the objective lens when the objective lens is covered. It is characterized by being.

  According to a fourth technical means, in any one of the first to third technical means, the elastic member is provided on a surface of the contact plate opposite to a surface on which the optical pickup contacts, The plate is urged toward the optical pickup so that the lid plate faces upward.

  A fifth technical means is an optical disk drive device provided with the dustproof structure of any one of the first to fourth technical means.

  According to the present invention, when the optical pickup is stopped at the stop position, the objective lens of the optical pickup is covered with a simple structure so that dust or the like floating and falling in the air does not enter the objective lens. It is possible to provide a dustproof structure for an optical pickup and an optical disc drive device provided with the dustproof structure.

  FIG. 1 is a schematic view seen from the side of an optical disk drive apparatus having a dustproof structure for an optical pickup according to an embodiment of the present invention. In the figure, 10 is an optical disk drive apparatus, and the optical disk drive apparatus 10 is an optical disk 12. A spindle motor 11 that rotatably holds the optical pickup 13, an optical pickup 13 that condenses and irradiates a laser beam on the optical disk 12 held by the spindle motor 11, and moves the optical pickup 13 in the radial direction of the optical disk 12 during use. A means (not shown) for moving and fixing the optical pickup 13 to a predetermined position outside the optical disk 12 when not in use, a dust-proof means 14 for covering the optical pickup 13 moved to the predetermined position to prevent dust, and a housing And a body 15. The means for moving the optical pickup 13 includes a driving mechanism including a driving motor and a plurality of gears for transmitting the driving force of the driving motor to the optical pickup 13.

  The optical disk drive device 10 of the present invention is applicable to various optical disk drives such as a DVD drive and a BD drive. In the case of a BD drive, for example, a BD recording medium such as a BD-ROM, BD-R, and BD-RE can be used. In the case of a DVD drive, for example, a DVD-video, a DVD-audio, a DVD-RAM, DVD-based recording media such as DVD-R, DVD-RW, DVD + ROM, DVD + R, and DVD + RW, and CD-based recording media such as CD-MA, CD-video, CD-R, and CD-RW can be used.

  In FIG. 1, an optical pickup 13 includes a laser drive circuit 13a, a laser light source 13b, and an optical system. This optical system includes an objective lens 13e, a reflecting mirror 13d, and the like for irradiating the optical disk 12 with a light beam spot 13g to perform focusing, tracking, and data recording and reproduction. In the optical pickup 13, the laser light 13c driven by the laser driving circuit 13a and emitted from the laser light source 13b passes through the reflection mirror 13d and is condensed by the objective lens 13e, and the light beam spot 13g is reproduced or reproduced from the optical disk 12. Focused on the recording layer. Further, the reflected light from there passes through the objective lens 13e and the reflecting mirror 13d, and is returned to a light receiving element (not shown) which is divided into several parts, and a light beam spot due to the light quantity difference and phase difference between the light receiving elements. It performs 13g focusing, tracking, and data recording and reproduction. The periphery of the objective lens 13e is covered with an objective lens cover 13f, and the upper surface of the objective lens 13e is opened.

FIG. 2 is a detail view of a main part showing an example of a state in which the objective lens 13e is covered by the dustproof means 14 when the optical pickup 13 shown in FIG. 1 is stopped.
The dust prevention means 14 urges the contact plate 14b with which the optical pickup 13 contacts, the cover plate 14a that rotates integrally around the contact plate 14b and the rotation shaft 14c, and the contact plate 14b to cover the cover plate 14a. It is comprised from the elastic member 14d which orient | assigns upward. The dust-proof means 14 has a structure in which the rotation shaft 14c is supported on one side surface or both side surfaces of the housing 15, and rotates when one end of the optical pickup 13 presses the contact plate 14b. The lid 14a is pushed down on the upper surface of the objective lens 13e by rotating around the shaft 14c, and the objective lens cover 13f (objective lens 13e) is covered.

  The elastic member 14d has one end fixed to the bottom surface of the housing 15 and urges the contact plate 14b toward the optical pickup 13 on the surface of the contact plate 14b opposite to the surface on which the optical pickup 13 contacts. The cover plate 14a is directed upward. When the optical pickup 13 is not in the fixed position, that is, when the optical pickup 13 is in use, the contact plate 14b is pushed toward the optical pickup 13 by the elastic member 14d so that the cover plate 14a can be held obliquely upward. I have to. As this elastic member 14d, for example, a leaf spring having low elasticity (that is, a weak biasing force) or the like is preferable, and it does not become a strong resistance with respect to the moving direction of the optical pickup 13 (right direction in the figure).

  According to this embodiment, when the optical pickup is stopped at the stop position, the objective lens of the optical pickup is covered with a simple structure, so that dust or the like that floats in the air and falls into the objective lens. Can be prevented. In addition, since the optical pickup does not receive a force from the dust-proof means when contacting / leaving the dust-proof means, the optical pickup can move smoothly.

  Furthermore, in an optical disc drive device, in order to keep the optical power on the optical disc constant, the objective lens cover is covered when not in use, so that it is not subject to power deterioration or reduction due to dust during use of the drive. It can be used in a highly reliable state over a period of time, and can be used even in a dusty environment.

  FIG. 3 is a main part detail view showing another example of a state in which the objective lens 13e is covered by the dustproof means 14 when the optical pickup 13 shown in FIG. 1 is stopped. Here, if the cover plate 14a and the objective lens cover 13f shown in FIG. 2 are made of different materials (for example, metal and resin), contact or rubbing between these members may occur and charging may occur. In the present embodiment, the lid plate 14a shown in FIG. 2 is made of the same material (for example, resin material) as the objective lens cover 13f so that charging due to contact or rubbing by using a member of a different material can be prevented. ing. When the objective lens cover 13f and the cover plate 14a are formed of the same resin material, an insulating material such as silicone is coated on at least one surface of the objective lens cover 13f and the cover plate 14a to provide electrical insulation. May be. The contact plate 14b as well as the cover plate 14a may be made of the same material as the objective lens cover 13f.

  FIG. 4 is a principal part detail view showing another example of a state in which the objective lens 13e is covered by the dustproof means 14 when the optical pickup 13 shown in FIG. 1 is stopped. In the present embodiment, a brush 14e is provided at the tip of the cover plate 14a shown in FIG. 2 to cover the cover plate 14a to prevent dust, and the brush 14e is brought into contact with the surface of the objective lens 13f to stop the optical pickup 13. The dust due to charging or the like is removed by sweeping the surface of the objective lens 13f immediately before the operation or immediately before the operation is resumed. As this brush 14e, for example, a commercially available lens cleaning brush, static elimination brush, or the like can be applied.

  In this way, in the optical disk drive device, in order to make the optical power on the optical disk constant, in addition to covering the objective lens cover when not in use, it is more effective by sweeping the upper surface of the objective lens with a brush. It can be used in a dusty environment, can be used in a reliable state over a long period of time, and can be used even in a dusty environment. Become.

  The dust-proof structure of the optical pickup and the optical disk drive apparatus according to the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention. .

It is the schematic seen from the side surface of the optical disk drive device provided with the dustproof structure of the optical pick-up which is one Embodiment of this invention. FIG. 2 is a detail view of a main part showing an example of a state where an objective lens is covered with a dustproof means when the optical pickup shown in FIG. 1 is stopped. FIG. 6 is a detail view of a main part showing another example of a state in which the objective lens is covered with dust-proof means when the optical pickup shown in FIG. 1 is stopped. FIG. 6 is a detail view of a main part showing another example of a state in which the objective lens is covered with dust-proof means when the optical pickup shown in FIG. 1 is stopped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Optical disk drive apparatus, 11 ... Spindle motor, 12 ... Optical disk, 13 ... Optical pick-up, 13a ... Laser drive circuit, 13b ... Laser light source, 13c ... Laser light, 13d ... Reflection mirror, 13e ... Objective lens, 13f ... Objective lens Cover: 13g: Light beam spot, 14: Dust-proof means, 14a: Cover plate, 14b: Contact plate, 14c: Rotating shaft, 14d: Elastic member, 14e: Brush, 15: Housing.

Claims (5)

  An optical pickup provided with an objective lens that condenses and irradiates a laser beam on an optical disk rotatably held by a spindle motor, and moves the optical pickup in the radial direction of the optical disk when in use, and the optical pickup when not in use In the dust-proof structure of the optical pickup, comprising: means for moving and fixing the optical disk to a predetermined position outside the optical disk; and dust-proof means for covering and dusting the objective lens of the optical pickup moved to the predetermined position. The means includes a contact plate with which the optical pickup contacts, a cover plate that rotates integrally around the contact plate and the rotation shaft, and biases the contact plate so that the cover plate faces upward. And when the optical pickup moves to the predetermined position and presses the abutment plate, the lid plate is pushed downward and the objective lens Dustproof structure of an optical pickup, which comprises dustproof and capped.   2. The dustproof structure for an optical pickup according to claim 1, wherein at least the cover plate is made of the same material as an objective lens cover for covering the periphery of the objective lens. .   3. A dustproof structure for an optical pickup according to claim 1 or 2, wherein a brush is provided at a tip of the lid plate, and the brush is attached so as to contact the objective lens when the objective lens is covered. A dust-proof structure for optical pickups.   4. The dust-proof structure of the optical pickup according to claim 1, wherein the elastic member is provided on a surface of the contact plate opposite to a surface with which the optical pickup contacts, A dustproof structure for an optical pickup, wherein the cover plate is directed upward by being biased toward the optical pickup.   An optical disk drive device comprising the dustproof structure for an optical pickup according to claim 1.

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