JP4278489B2 - Optical disk drive - Google Patents

Description

  The present invention relates to an optical disk drive device, and relates to a technique for reading information from an optical disk and writing information on the optical disk with an optical pickup having an objective lens.

  This type of general optical disk drive device has an optical pickup equipped with an objective lens for converging laser light on the optical disk, and information is received from the optical disk by reciprocating the optical pickup in the inner and outer circumferential directions of the optical disk. Reading and writing information to the optical disc.

  This objective lens is held by a lens holder, and is movable in the thickness direction of the optical disk, that is, the focus direction, and the inner and outer peripheral direction, that is, the tracking direction in order to focus the laser beam on a predetermined position on the optical disk. And has a predetermined moving range in each direction in order to ensure stable reading and writing characteristics.

  In addition, since the objective lens and the lens holder need to move with a small current with high sensitivity, it is common to set the supporting force of the elastic wire as low as possible. Therefore, for example, when an impact force due to dropping or the like is received during transportation of the apparatus, the elastic wire supporting the lens or the lens holder is damaged by expansion or contraction or twisting due to collision with another member. In some cases, the objective lens may be plastically deformed, and as a result, a positional deviation or an angular deviation occurs in the objective lens, and a satisfactory characteristic cannot be obtained.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 07-31966), Patent Document 2 (Japanese Patent Laid-Open No. 2000-149294) and Patent Document 3 (Japanese Patent Laid-Open No. 2001-93173) are examples of conventional countermeasures against such problems. Is known.

  Further, since the objective lens is exposed to face the information recording surface of the optical disc as described above, dust is likely to adhere to the surface. For this reason, when dust adheres to the objective lens, the amount of light emitted from the laser and the amount of reflected light from the optical disk are reduced, and satisfactory characteristics may not be obtained.

For example, Patent Document 4 (Japanese Patent Laid-Open No. 03-256233), Patent Document 5 (Japanese Patent Laid-Open No. 04-192169), Patent Document 6 (Japanese Patent Laid-Open No. 04-238187), and Patent Documents are examples of conventional countermeasures against such problems. 7 (Japanese Patent Laid-Open No. 05-174411) and Patent Document 8 (Japanese Patent Laid-Open No. 2002-298411) are known.
JP 07-31966 A JP 2000-149294 A JP 2001-93173 A JP 03-256233 A JP 04-192169 A JP 04-238187 JP 05-174411 A JP 2002-298411 A

  However, in the conventional configuration for dealing with the deformation prevention of the elastic wire described above, the lens and the lens holder are movable within a predetermined movement range and only when moving outside the predetermined movement range. It is effective and does not regulate the range of movement of the lens or lens holder, which is the biggest factor in reducing the impact force at the time of collision. Therefore, it is insufficient as a measure for preventing deformation of the elastic wire due to dropping during transportation.

  Also, in the conventional configuration for dealing with the prevention of dust adhesion to the objective lens as described above, the structure of the device is complicated, the size is increased, the number of parts is increased, the load for moving the optical pickup is increased, and the measures for preventing dust are insufficient. This configuration has various drawbacks.

  In view of the above-described conventional problems, the present invention can reduce damage to the objective lens drive unit due to a drop impact and the like, and prevent dust from adhering to the objective lens surface at the same time and without adding parts, and also has high reliability. An object of the present invention is to provide an optical disk drive device that can be realized.

In order to solve the above-mentioned problems, an optical disk drive apparatus according to the present invention reciprocates an optical pickup having an objective lens and a lens holder in the inner and outer peripheral directions of the optical disk over an operating position and a retracted position, and also tracks the objective lens and the lens holder. Objective lens driving means for driving in the direction of focus and in the direction of focus, while moving the optical pickup from the operating position to the retracted position, or while moving from the retracted position to the operating position, in a direction to move the objective lens away from the disk signal recording surface actuating the objective lens driving unit so as to move to, the restriction member abutting on the front sharp lens holder in a non-operating state of the objective lens driving means to wait the optical pickup to the retracted position provided, including focusing direction, a tracking direction Front in all directions parallel to the disk signal recording surface The position of the objective lens is regulated by the regulating member so that the movable range of the objective lens is smaller than the movable range of a predetermined amount in the operating state, and the objective lens is moved in the operating state of the objective lens driving means. The objective lens and lens holder are moved without colliding with the restricting member by moving in the direction away from the disc signal recording surface in the focus direction than the neutral position in the non-operating state of the driving means, and the objective lens is driven in the retracted position. in the inoperative state of the unit to return operation to the objective lens and the lens holder neutral position, that the lenses holder is engaged with the regulating member, reducing the impact force by subtracting extreme the movable range of the objective lens and lens holder Let

Further regulating member, by the return force to return operation objective lens or lens holder to the neutral position to the inoperative objective lens driving means, top the entire circumference of the ring portion outer peripheral portion is formed on the near vicinity of the lens holder of the objective lens The surface of the objective lens is covered by being in close contact with the lens, and the position of the ring portion is controlled by surrounding the outer peripheral wall of the ring portion with a restriction portion provided on the restriction member in a state where the lens surface is sealed. The restricting member is arranged so that the contact position between the top surface of the lens and the restricting member comes before the objective lens or the lens holder reaches the neutral position.

  As described above, according to the optical disk drive device of the present invention, it is possible to reduce damage to the objective lens drive unit due to a drop impact or the like and prevent dust from adhering to the surface of the objective lens at the same time, without adding parts, and with high reliability. This can be realized, and stable optical disk reading and writing characteristics can be ensured.

An optical disk drive apparatus according to a first aspect of the present invention holds an objective lens, and the lens holder in which a ring portion is formed in the vicinity of the outer periphery of the objective lens and the lens holder are movable in tracking and focusing directions. An objective lens driving means constituted by a suspended elastic body, and an optical pickup on which the objective lens driving means is mounted, can reciprocate in the inner and outer peripheral directions of the disk, and stands by at the retracted position when the apparatus is not operating. , possible ring portion and the fitting of the front Symbol lens holder similar retracted position, comprising a regulating member having a recess in the shape covering the surface of the objective lens, the recess, the ring outer circumferential wall of the front Stories lens holder siege to the inner peripheral wall of the lens holder to position restriction on a plane parallel to the disk signal recording surface, the ring portion top surface of the front Symbol lens holder total The elastic body that suspends the lens holder at the close contact position has a close contact surface that restricts the position in the focus direction so that the elastic body is bent even when the objective lens driving device is not operated. is there.

  With the configuration described above, the objective lens driving means is activated while the optical pickup is moved from the operating position to the retracted position or moved from the retracted position to the operating position, and the objective lens is in the non-operating state of the objective lens driving means. The objective lens and the lens holder pass through the regulating member without colliding with each other without moving from the neutral position to the direction away from the disc signal recording surface in the focus direction.

On the other hand, in the retracted position of the optical pickup is to return operation to the objective lens and the lens holder neutral position by the objective lens driving means inoperative state, the lenses holder is regulating member and the fitting, in its return course The entire outer periphery of the objective lens or the entire top surface of the ring portion formed on the lens holder is in contact with the concave contact surface of the regulating member, that is, the surface covering the surface of the objective lens.

  By arranging the restriction member so that the contact position between the restriction member and the top surface of the ring portion is just before the objective lens and the lens holder reach the neutral position, the return force to the neutral position, for example, the elasticity of the elastic wire The entire circumference of the top surface of the ring portion is pressed against the regulating member by force and brought into close contact.

  The surface of the objective lens is sealed with the regulating member by the close contact between the regulating member and the ring portion, and the moving range of the objective lens in the focus direction is regulated to be smaller than a predetermined moving range during operation.

Further, the inner peripheral portion of the concave portion of the restricting member surrounds the outer peripheral wall of the ring portion to restrict the position of the objective lens, so that the movable range in all directions parallel to the optical disc signal recording surface including the tracking direction of the objective lens is achieved. the regulates so that less than the predetermined movable range during operation.

Thus, for example, lenses holders when subjected to impact force caused by dropping or the like during transportation of the optical disk drive even collide with the regulating member, the impact force is reduced by being extremely reduced its movable range. As a result, there is little damage to the objective lens driving means, and there is no positional deviation or angular deviation of the objective lens due to deformation of the elastic wire supporting the lens holder, and stable characteristics can be obtained.
Moreover, since the adhesion of dust can be prevented by sealing the objective lens surface with the regulating member, there is no decrease in the amount of light emitted from the laser and the amount of reflected light from the optical disc, and stable characteristics can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 8 are diagrams showing an optical disk driving apparatus according to an embodiment of the present invention. FIG. 1 is a plan view showing a state where an optical pickup is located in the innermost lead-in area of the optical disk. FIG. XX partial sectional view showing the position of the objective lens and the lens holder of the objective lens driving device, FIG. 3 is a plan view showing the state where the optical pickup is located in the outermost peripheral lead-out area of the optical disc, and FIGS. FIG. 6 is a plan view showing a state where the optical pickup is located at a retracted position outside the optical disc information area, and FIGS. 7 to 8 are XX partial sectional views in the same state. .

Below, the structure for driving the optical pick-up 2 in the inner-periphery direction of the optical disk 11 among the functions which an objective lens drive means bears is demonstrated.
As shown in FIGS. 1, 3, and 6, the mechanical chassis 1 is provided with a drive shaft 3 for driving the optical pickup 2 in the inner and outer peripheral directions of the optical disk 11, and the drive shaft 3 is a bearing portion 2 a of the optical pickup 2. 2b, the one end 3a is rotatably held by a bearing hole 1a provided in the mechanical chassis 1, and the drive gear 4 is press-fitted and held by the other end 3b. The drive gear 4 is rotatably supported by a bearing portion 1b provided on the mechanical chassis 1 with a shaft portion 4a formed on one side.

  The optical pickup 2 is slidable (reciprocating) in the direction of arrow AB on the mechanical chassis 1 with a guide portion 2c formed on one side engaged with a counter shaft 1c provided on the mechanical chassis 1. The thrust spring 5 is press-fitted and held in a fixed portion 1 d provided on the mechanical chassis 1, abuts against the tip portion 4 b and the shaft portion 4 a of the drive gear 4, and the drive shaft 3 is moved in the arrow A direction and the arrow D direction via the drive gear 4. Is pressed.

  The nut plate 6 is fixed to the optical pickup 2, and a protrusion 6 a formed on the nut plate 6 is engaged with a worm portion 3 c of the drive shaft 3, and the nut plate 6 is rotated by the shaft of the drive shaft 3 by the rotation of the drive shaft 3. Move in the direction of the heart.

  The traverse motor 7 is fixed to the mechanical chassis 1, and a motor gear 8 is press-fitted and held on the rotating shaft 7a. The motor gear 8 meshes with the drive gear 4 and transmits the rotational force of the traverse motor 7 to the drive shaft 3 via the motor gear 8 and the drive gear 4. The spindle motor 9 is fixed to the mechanical chassis 1 and press-fits a turntable 10 on which an optical disk 11 is placed on a rotating shaft 9a.

  Below, among the functions of the objective lens driving means, a configuration for driving the objective lens 12 and the lens holder 13 arranged in the optical pickup 2 in the tracking direction and the focus direction, and the objective lens 12 and the lens holder 13 can be moved. A configuration for regulating the range will be described.

  As shown in FIGS. 2, 4, 5, 7, and 8, the lens holder 13 holds and holds the objective lens 12, and has a ring portion 13a near the outer periphery of the objective lens 12, and the top surface 13b of the ring portion 13a. Is set at a position higher than the zenith of the objective lens 12.

  One end of the suspension wire 14 is fixed to the suspension wire fixing portion 15, and the other end supports the lens holder 13 movably within a movable range in the focus direction (arrow L direction) and tracking direction (arrow M direction) of the optical disk 11. ing.

  As shown in FIGS. 1, 3, and 6, the focus coil 16 is fixed in the lens holder 13 with the tracking coil 17 held on the side surface, and the magnet 18 sandwiches the tracking coil 17 with a part of the focus coil 16. When a predetermined current is supplied to the focus coil 16 and the tracking coil 17 in response to a command from the control circuit, the focus direction of the objective lens 12 with respect to the optical disk 11 (arrow L) Direction) and tracking direction (arrow M direction) are accurately controlled.

The actuator base 19 holds the suspension wire fixing portion 15 and the magnet 18 and is fixed to the optical pickup 2.
The restricting member 20 is formed integrally with the mechanical chassis 1 and has a sealing portion 20a and a restricting portion 20b. The sealing portion 20a is a surface of the objective lens 12 when the optical pickup 2 is in the retracted position shown in FIG. And restricts the position in the focus direction by contacting the entire top surface of the ring portion 13a of the lens holder 13, and the restricting portion 20b surrounds the outer peripheral wall of the ring portion 13a and includes the tracking direction. Regulates the position in all directions parallel to the signal recording surface.

  The operation of the optical disk drive configured as described above will be described below. When the traverse motor 7 is rotated clockwise or counterclockwise, the rotational force is transmitted to the drive shaft 3 via the drive gear 4, and the nut plate 6 moves in the axial direction of the drive shaft 3 by the rotation of the drive shaft 3. The optical pickup 2 moves in the direction of arrow A or arrow B, that is, in the inner and outer peripheral directions (radial direction) of the optical disc 11, and in the operating state of the optical disc driving apparatus, the innermost peripheral position shown in FIGS. 3. It moves between the outermost peripheral positions shown in FIG. 4 and moves to the retracted position shown in FIG. 6 when the optical disk drive is not operating.

Further, when the spindle motor 9 is rotated in a certain direction, the optical disk 11 placed on the turntable 10 also rotates together. The optical disk 11 is rotated and the optical pickup 2 is moved as described above. Incidentally, when the optical disk 11 is placed on the turntable 10 and the spindle motor 9 is rotated, an adsorption action such as a magnet is used to hold the optical disk 11 and the turntable 10 so that no slip occurs. (Clamping method is omitted)
When reading information from the optical disk 11 and writing information to the optical disk 11, the optical disk 11 is rotated at a predetermined rotational speed by the spindle motor 9, and the optical pickup 2 is moved by the traverse motor 7 as shown in FIGS. The lens is moved to a predetermined operating position between the inner peripheral position and the outermost peripheral position in FIGS. 3 and 4, and the position of the objective lens 12 relative to the optical disk 11 is controlled by a command from the control circuit, so that the operating state is obtained.

  When the disk end information in the outermost peripheral lead-out area is detected from this operation state or when a recording / reproduction stop command is received, the rotation of the optical disk 11 is stopped and the optical pickup 2 is moved as shown in FIG. The lens is moved to the outermost peripheral lead-out area, a predetermined current is supplied to the focus coil 16 to drive the lens holder 13 in the focus direction, and the maximum movable range L in the direction of arrow D, that is, away from the disk signal recording surface of the optical disk 11 Move to position.

  Thereafter, as shown in FIG. 6, the optical pickup 2 is moved toward the retracted position. At this time, as shown in FIG. 5, since the lens holder 13 is held in the state of being moved to the maximum position of the movable range L in the direction of arrow D, the ring holder 13a of the lens holder 13 The restricting member 20 does not collide.

When the optical pickup 2 reaches the retracted position, the drive of the traverse motor 7 is stopped and the current supply to the focus coil 16 is stopped. (There are many means for detecting the retracted position of the optical pickup 2, such as detection by a switch or photo sensor, detection by change in the traverse motor drive current, etc., but detailed description is omitted.)
As a result, as shown in FIG. 7, the lens holder 13 receives the return force of the suspension wire 14, and from the predetermined position when energized (operating state) in the direction indicated by the arrow C, that is, when not energized (non-operating state). While moving in the direction, as shown in FIG. 8, the top surface 13 b of the ring portion 13 a comes into contact with the sealing portion 20 a of the restricting member 20 during the return.

  At this time, the sealing portion 20a is arranged so that the contact position between the top surface 13b of the ring portion 13a and the sealing portion 20a of the regulating member 20 is closer to the lens holder 13 in the moving direction than the neutral position of the lens holder 13. Therefore, the position of the suspension wire 14 is regulated in a deformed state, and an elastic force is generated.

  With this restoring force (elastic force), the top surface 13b of the ring portion 13a presses the sealing portion 20a of the regulating member 20, and the entire surface of the top surface 13b is brought into close contact with the sealing portion 20a, thereby sealing the surface of the objective lens 12. Thus, it is possible to prevent the adhesion of dust. Accordingly, there is no decrease in the amount of light emitted from the laser and the amount of reflected light from the optical disk 11, and stable characteristics can be obtained.

  In addition, since the sealing portion 20a is disposed so that the contact position is closer to the lens holder 13 in the moving direction than the neutral position of the lens holder 13, the movable range of the lens holder 13 in the focus direction is the operating state. Of the optical disk 11 including the tracking direction of the lens holder 13, the restriction portion 20 b of the restriction member 20 surrounds the outer peripheral wall 13 c of the ring portion 13 at the time of contact. The movable range in all directions parallel to the disk signal recording surface is restricted to be extremely smaller than the movable range (movable range M) in the operating state.

  Therefore, for example, when the optical disk drive device receives an impact force due to dropping or the like during transportation, even if the lens holder 13 collides with the regulating member 20, the impact force is reduced because the movable range is extremely reduced. As a result, less damage is applied to the objective lens driving unit, and there is no positional deviation or angular deviation of the objective lens 12 due to the deformation of the suspension wire 14 supporting the lens holder 13, and stable characteristics are obtained. can get.

  The transition from the retracted state to the operating state is the reverse of the above. That is, in the retracted state of the optical pickup 2 shown in FIGS. 6 and 8, the focus coil 16 is predetermined to move the lens holder 13 to the maximum position of the movable range L in the direction of arrow D, that is, the direction away from the disk signal recording surface of the optical disk 11. Supply current.

  As a result, the contact between the top surface 13b of the ring portion 13a and the sealing portion 20a of the regulating member 20 is released, and the state shown in FIG. 7 is obtained. Thereafter, the optical pickup 2 is moved in the direction of the operation position between the innermost peripheral position in FIG. 1 and the outermost peripheral position in FIG. At this time, since the lens holder 13 is held in the state of being moved in the direction of the arrow D, the ring portion 13a of the lens holder 13 and the restricting portion 20b of the restricting member 20 do not collide during the movement.

  When the optical pickup 2 reaches the innermost lead-in area of the optical disk shown in FIGS. 1 and 2, the driving of the traverse motor 7 is stopped, and the optical disk 11 is rotated at a predetermined rotational speed by the spindle motor 9 and the control circuit By operating the position control of the objective lens 12 with respect to the optical disk 11 in accordance with the command, the operation becomes possible.

In this embodiment, the contact portion (ring portion) with the regulating member 20 is formed in the lens holder 13, but it may be formed integrally with the objective lens 12.
As described above, in the present embodiment, as the means for engaging the lens holder 13 and the regulating member 20, the action of the objective lens driving means that is generally provided as a standard in the optical pickup 2 is used. Dedicated parts and control circuits are not required and highly reliable operation can be realized.

  The present invention can reduce damage to the objective lens drive unit due to a drop impact and the like, and prevent dust from adhering to the objective lens surface at the same time, without adding parts, and can be realized with high reliability. Since reading and writing characteristics can be ensured, the present invention can be used for an optical disc driving apparatus that reads information from an optical disc and writes information to the optical disc with an optical pickup having an objective lens.

The top view which shows the state in which optical pick-up is located in the optical disk innermost periphery lead-in area in one Embodiment of this invention XX partial sectional view showing the position of the objective lens and lens holder of the objective lens driving device in the state of FIG. The top view which shows the state which the optical pick-up is located in the optical disk outermost periphery lead-out area in the embodiment XX partial sectional view showing the position of the objective lens and lens holder of the objective lens driving device in the state of FIG. XX partial sectional view showing the position of the objective lens and lens holder of the objective lens driving device in the state of FIG. The top view which shows the state in which the optical pick-up is located in the retracted position which remove | deviated from the optical disk information area in the same embodiment XX partial sectional view showing the position of the objective lens and the lens holder of the objective lens driving device in the state of FIG. XX partial sectional view showing the position of the objective lens and the lens holder of the objective lens driving device in the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mechanical chassis 2 Optical pick-up 3 Drive shaft 4 Drive gear 5 Thrust spring 6 Nut plate 7 Traverse motor 8 Motor gear 9 Spindle motor 10 Turntable 11 Optical disk 12 Objective lens 13 Lens holder 13a Ring part 13b Top surface 13c Outer wall 14 Suspension wire 15 Suspension wire fixing part 16 Focus coil 17 Tracking coil 18 Magnet 19 Actuator base 20 Restricting member 20a Sealing part 20b Restricting part

Claims (1)

An objective lens driving means comprising an objective lens holding and a lens holder in which a ring portion is formed in the vicinity of the outer periphery of the objective lens, and an elastic body that suspends the lens holder so as to be movable in the tracking and focusing directions; wherein mounting the objective lens driving means, reciprocally operated in the inner periphery direction of the disk, in a non-operating state of the device fitted with an optical pickup to wait at the retracted position, the ring portion of the front Symbol lens holder similar retracted position if possible, the includes a regulating member having a recess in the shape that covers the surface of the objective lens, the recess surrounds the ring outer circumferential wall of the front Symbol lens holder, parallel to said lens holder disc signal recording surface a peripheral wall inner regulating the position on the plane, in close contact with the ring portion top entire circumference of the front Symbol lens holder, at its contact position, the Renzuho The elastic member for suspending the loaders is the to be a state bent in the inoperative condition of the objective lens driving apparatus, an optical disk drive apparatus characterized by having a contact surface to position regulation in the focus direction.

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