JP2005222615A - Optical disk system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology by which movement of an optical pickup is secured in an optical disk system. <P>SOLUTION: A recessed part or a hole is prepared along a longitudinal direction of a lead screw member at a chassis side, and a protrusion is prepared at a guide feed member which is combined with the optical pickup to be engaged to a lead screw of the lead screw member in a rack section, and the protrusion is inserted and engaged to the recessed part or the hole. With this engagement, bringing the rack section of the guide feed member running on the lead screw of the lead screw member is prevented, and a normal engagement status between the rack section and the lead screw is maintained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus for recording or reproducing information on an optical disc, and more particularly to a technique for moving an optical pickup.

  Examples of conventional techniques related to the present invention include those described in Japanese Patent Application Laid-Open No. 2003-249042 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2000-339882 (Patent Document 2). In JP-A-2003-249042, an L-shaped stopper that extends from the upper portion of the rack portion (the portion that engages with the thread groove of the lead screw) and covers the lead screw is provided, and the stopper and the lead screw are: A configuration is described in which the teeth of the rack part come into contact with each other when over the thread groove of the lead screw, and Japanese Patent Laid-Open No. 2000-339882 also discloses substantially the same technique as described in the above-mentioned Japanese Patent Laid-Open No. 2003-249042. The technology is described.

JP 2003-249042 A

JP 2000-339882 A

In any of the prior arts described in the above publications, when the tooth portion of the rack portion receives a force in the rotation direction of the lead screw, the effect of regulating the displacement of the rack portion in the direction to remove the thread groove of the lead screw. Is not expected to be sufficient.
An object of the present invention is to prevent the rack portion from riding on the lead screw even when the rack portion receives a force in the rotation direction of the lead screw in the optical disc apparatus in view of the above-described state of the prior art. That is.
An object of the present invention is to solve such problems and provide a technique capable of ensuring the movement of an optical pickup in an optical disc apparatus.

  In order to solve the above-mentioned problems, in the present invention, in the optical disk apparatus, a recess or a hole along the longitudinal direction of the lead screw member is provided on the chassis side, and is coupled to the optical pickup to the feed screw of the lead screw member at the rack portion. A protrusion is provided on the side of the guide feed member to be engaged, and the protrusion is inserted into and engaged with the recess or hole, and by this engagement, the lead screw of the lead screw member of the rack portion of the guide feed member The rack portion is prevented from riding on and the normal engagement state between the rack portion and the feed screw is maintained.

  According to the present invention, in the optical disc apparatus, the rack portion of the guide feed member can be prevented from riding on the lead screw member, and normal movement of the optical pickup is ensured.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1-4 is explanatory drawing of embodiment of this invention. FIG. 1 is a configuration example diagram of an optical disc apparatus as an embodiment of the present invention, FIG. 2 is a configuration diagram on the back side of the optical disc apparatus of FIG. 1, and FIG. 3 is an optical pickup feeding mechanism section of the optical disc apparatus of FIG. FIG. 4 is an enlarged view for explaining the operation and effect of the present invention.

  In FIG. 1, reference numeral 1 denotes an optical pickup that irradiates an information recording surface of an optical disc (not shown) with laser light or receives reflected light to record and reproduce signals on the information recording surface. Is a spindle motor that rotationally drives the optical disc, 3 is a lead screw member that has a feed screw formed on the surface thereof, and moves the optical pickup 1 in the disc radial direction by the rotation of the feed screw, and 4 is the disc radius of the optical pickup 1 Guide member 5 that guides the movement in the direction, 5 is a feed motor that rotationally drives the lead screw member 3, and 6 is a guide that is coupled to the optical pickup 1 and engaged with the feed screw of the lead screw member 3 at the rack portion. A feed member, 7 is an elastic member such as a spring for biasing the rack portion of the guide feed member 6, 8 is a chassis, and 11 is a chassis. A recess or hole formed in the. The lead screw member 3 is disposed in parallel to the guide member 4. The guide feed member 6 is given a moving force through the rack portion by the rotation of the feed screw of the lead screw member 3 and is guided by the guide member 4 to move in the disk radial direction. 11 has a protrusion to be engaged. When the protrusion engages with the recess or hole 11, the engagement state between the rack portion of the guide feed member 6 and the feed screw of the lead screw member 3 is maintained, and the rack portion is placed on the surface of the lead screw member 3. Avoid getting on.

  In the above configuration, for example, when the lead screw member 3 is rotationally driven by the feed motor 5 at the start of the recording or reproduction operation, the moving force is applied to the rack portion of the guide feed member 6 engaged with the groove of the feed screw. And the optical pickup 1 together with the guide feed member 6 is guided by the guide member 4 and moves in the radius increasing direction of the optical disk. When the rack part moves and the optical pickup 1 reaches the final position in the disk radius increasing direction, it is stopped by a control system (not shown) such as a microcomputer. From this state, when the optical pickup 1 further moves in the direction of increasing the disk radius due to a malfunction of the control system or an external impact force, the movement is blocked by a member that regulates the amount of movement of the optical pickup 1 and forced. Stop. At this time, since the feed motor 4 continues to rotate and rotates the lead screw member 3 as it is, the rack part is disengaged from the groove of the feed screw of the lead screw member 3, and the tooth skipping state (the rack part is disengaged from the groove of the screw, The state where the engagement with the groove is repeated again). In the case of the configuration shown in FIG. 1, the rack portion finally returns to the engaged state with the groove of the feed screw of the lead screw member 3 even if the tooth skipping state occurs. In the tooth skipping state, an instruction signal for reversing the feed motor 5 is formed by a control system (not shown) such as a microcomputer. As a result, the feed motor 5 is reversely rotated, the lead screw member 3 is rotated in the opposite direction to the above, and the optical pickup 1 is moved in the radius decreasing direction of the optical disk to move to a predetermined position on the inner diameter side of the disk.

FIG. 2 is a configuration diagram of the back surface side of the optical disk apparatus of FIG.
In the following description of FIG. 2, the same reference numerals as those in FIG.
In FIG. 2, 11 is a recess or hole formed in the chassis 8, and 21 is a protrusion in the guide feed member 6 that engages with the recess or hole 11. The recess or hole 11 is formed in the chassis 8 with a substantially constant width along the longitudinal direction of the lead screw member 3 and the guide member 4.

FIG. 3 is an enlarged view of the optical pickup feeding mechanism portion of the optical disk apparatus of FIG.
In FIG. 3, reference numeral 10 denotes a rack portion on the guide feed member 6, w ₁ denotes an outer dimension of the protrusion 21 provided on the guide feed member 6, and w ₂ denotes a recess or hole 11 formed in the chassis 8. Width. w ₂ > w _1, and the difference between the two is a position where the engagement between the rack portion 10 and the lead screw of the lead screw member 3 is not disengaged in the direction of the arrow, and the protrusion 21 is located around the recess or hole 11. The size difference is in contact with the surface. Due to the contact, the displacement of the rack portion 10 that is disengaged from the lead screw of the lead screw member 3 is prevented, and the engaged state is maintained.

  FIG. 4 is a diagram illustrating an operation state when the protrusion 21 of the guide feed member 6 and the recess or hole 11 of the chassis 8 are not provided in the configuration of FIG. When the protrusion 21 and the concave portion or the hole 11 are not provided, the lead screw member 3 is applied when an impact force is applied to the apparatus or when the guide feed member 6 is stopped at the disk outermost position or the innermost position. Is continuously rotated, the rack portion of the guide feed member 6 is detached from the feed screw portion of the lead screw member 3 and rides on the surface of the feed screw, and returns to the original engaged state as it is. Not happen.

  According to the embodiment of the present invention, in the optical disk apparatus, when the impact force is applied to the apparatus or when the guide feed member 6 is stopped at the disk outermost position or innermost position, the lead screw member 3 is Even in the case of rotation, it is possible to prevent the rack portion of the guide feed member from riding on the lead screw member, and normal movement of the optical pickup is ensured.

1 is a configuration example diagram of an optical disc apparatus as an embodiment of the present invention. FIG. 2 is a configuration diagram of a back surface side of the optical disc apparatus of FIG. 1. FIG. 2 is an enlarged view of an optical pickup feeding mechanism unit of the optical disc apparatus of FIG. 1. It is a figure explaining the effect | action and effect of this invention.

Explanation of symbols

1 ... optical pickup,
2 ... Spindle motor,
3 ... lead screw member,
4 ... guide member,
5 ... Feed motor,
6 ... Guide feed member,
7: elastic member,
8 ... Chassis,
11 ... recess or hole,
21 ... Projection.

Claims (3)

An optical disc apparatus that moves an optical pickup in a radial direction of an optical disc to perform recording or reproduction of information or both,
A guide member for guiding the movement of the optical pickup;
A lead screw member arranged in parallel to the guide member and having a feed screw formed on the surface;
A feed motor for rotationally driving the lead screw member;
A chassis that supports the guide member, the lead screw member or the feed motor, and has a recess or a hole formed along the longitudinal direction of the lead screw member;
Coupled to the optical pickup, engaged with the lead screw of the lead screw member at the rack portion, and given a moving force through the rack portion by rotation of the feed screw, guided by the guide member and moved in the disk radial direction And a guide feed member having a protrusion that engages with the recess or hole of the chassis;
And holding the engagement between the rack portion of the guide feed member and the feed screw of the lead screw member by the engagement between the protrusion of the guide feed member and the recess or hole of the chassis. An optical disc apparatus characterized by that.   The protrusion of the guide feed member is configured to contact the peripheral surface of the recess or hole of the chassis at a position where the rack portion of the guide feed member and the feed screw of the lead screw member are not disengaged. The optical disc apparatus according to claim 1, wherein 2. The optical disc apparatus according to claim 1, wherein the rack portion of the guide feed member is configured to be urged by an elastic restoring force of an elastic member and engage with a feed screw of the lead screw member.

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