JP2005166225A - Transport mechanism of optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transport mechanism of an optical pickup, which allows angle in the tangential direction of the optical pickup to be adjusted simply and highly accurately. <P>SOLUTION: A first and second cylinder section 12a, 12b are provided on a metal adjustment pin 12, of which the centers are made to set to be offset. It is constituted so that the first cylinder section 12a is rotatably inserted into an insert hole 10 formed in a guided section 4 of a carriage 3, and a periphery surface of the second cylinder section 12b is slid and contacted on a top surface of a guiding member 6. The amount of projection from the guided section 4 of the second cylinder section 12b is changed by rotating the adjustment pin 12. Thus, the angle of the optical pickup 1 in the tangential direction is adjusted, by making the guided section 4 side of the carriage 3 move up and down relative to the guiding member 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical pickup transfer mechanism in a disk apparatus that records and / or reproduces information on a disk such as a CD or a DVD, and in particular, a tilt for finely adjusting the inclination of the optical pickup with respect to the recording surface of the disk. The present invention relates to an adjustment mechanism.

  An optical pickup as shown in FIG. 7 is used for a disk apparatus that records and reproduces information on and from a disk such as a CD or DVD using an optical pickup in order to transport the optical pickup along the radial direction of the disk. A transfer mechanism is provided.

  As shown in the figure, an optical pickup 100 includes an objective lens 102, a driving mechanism (not shown) for driving the objective lens 102, and optical components such as the objective lens 102, the driving mechanism, and a semiconductor laser. The carriage 101 is mainly configured, and the carriage 101 is disposed between a guide shaft 103 and a screw shaft (feed screw mechanism) 104. The guide shaft 103 and the screw shaft 104 are arranged to face each other in parallel on one side of a mechanism chassis (not shown), and the screw shaft 104 is rotationally driven in both forward and reverse directions by using a thread motor (not shown) as a drive source. It is like that. Receiving portions 101 a and 101 b protrude from both side surfaces of the carriage 101, one receiving portion 101 a abuts on the peripheral surface of the guide shaft 103, and the other receiving portion 101 b is loosely inserted into the screw shaft 104. . A leaf spring 105 is screwed to the carriage 101 in a cantilever shape, and a female screw member 106 called a half nut is fixed to the free end side of the leaf spring 105. The tooth portion engraved on the female screw member 106 over about a half circumference is engaged with the screw portion 104 a of the screw shaft 104 by receiving the elastic force from the leaf spring 105.

  The optical pickup transfer mechanism schematically configured as described above is such that when the screw shaft 104 rotates in either the forward or reverse direction, the rotational force is converted into a linear motion by the female screw member 106 and transmitted to the carriage 101. 101 moves along the thrust direction (arrow direction in FIG. 7) of the guide shaft 103 and the screw shaft 104. As a result, the entire optical pickup 100 is transferred in the radial direction of the disc (not shown) via the carriage 101, and information recording and reproducing operations can be performed on the disc.

  By the way, in a disk apparatus equipped with such an optical pickup 100, if the optical axis of the objective lens 102 is not kept perpendicular to the recording surface of the disk, the laser beam spot is distorted. In order to easily reduce the detection accuracy, for example, an actuator on which the objective lens 102 is mounted is swung on the carriage 101 using a plurality of adjustment screws at the stage of assembling the optical pickup 100, thereby Adjustment is made so that the axis is kept perpendicular to the recording surface of the disc. However, when information is recorded or reproduced by an optical pickup on a disk having a very high recording density such as a DVD, the perpendicularity between the recording surface of the disk and the optical axis of the objective lens 102 is slightly impaired. As a result, the detection accuracy is greatly reduced, and therefore tilt adjustment is required to finely adjust the tilt of the optical pickup 100 after the optical pickup 100 is incorporated into the disk device. There are two types of tilt adjustment: a radial direction (radial direction) of the disc and a tangential direction (direction perpendicular to the radial direction). Conventionally, the height of the guide shaft 103 is adjusted by adjusting the tilt in the tangential direction. The technique made to do by this is known (for example, refer patent document 1).

Such a conventionally known optical pickup transfer mechanism is provided with cylindrical bearing portions eccentric to the center axis at both ends of a guide shaft, and these bearing portions are rotatably supported by bearings fixed to a mechanism chassis or the like. Yes, one end of the optical pickup can be moved up and down by rotating the guide shaft. Therefore, the tilt adjustment in the tangential direction of the optical pickup can be performed by rotating the guide shaft using a jig such as a spanner after the optical pickup is incorporated in the disk device.
JP 2000-285472 A (page 2-3, FIG. 5)

  As described above, in the conventional technology described above, the tilt adjustment in the tangential direction of the optical pickup can be performed only by rotating the guide shaft. However, the long guide shaft whose both ends are supported by the bearings is attached to a jig such as a spanner. Therefore, it is difficult to rotate to an accurate angular position, and it is difficult to adjust the angle easily and with high accuracy. In addition, in order to rotate a guide shaft having a circular cross section with a jig such as a spanner, it is necessary to form parallel notches into which the jig is fitted at both ends of the guide shaft, and the regions where these notches are formed. Cannot be used as a guide portion for guiding the carriage, and there has been a problem that the optical pickup transfer mechanism is enlarged. In addition, since a large twisting force in the rotational direction is applied to the guide shaft during angle adjustment, it is necessary to use a metal guide shaft such as stainless steel with high mechanical strength, which is made of a synthetic resin that is advantageous for cost reduction and weight reduction. There was also a problem that the guide shaft could not be used.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to provide an optical pickup transport mechanism that can easily and accurately adjust the angle of the optical pickup in the tangential direction. There is.

  The present invention provides an adjustment pin having first and second cylindrical portions whose centers are eccentric, and inserts the first cylindrical portion into an insertion hole provided in a guided portion of the carriage. The outer peripheral surface of the cylindrical portion 2 is brought into sliding contact with the guide member that supports the guided portion, and the guided pin side moves up and down with respect to the guide member by rotating the adjustment pin around the first cylindrical portion. did.

  An optical pickup transport mechanism according to the present invention prepares an adjustment pin having first and second cylindrical portions whose centers are eccentric from each other, and the first cylindrical portion of the adjustment pin is provided on a guided portion of a carriage on which an objective lens is mounted. Since the outer peripheral surface of the second cylindrical portion of the adjustment pin is in sliding contact with the guide member supported by the guided portion, the angle in the tangential direction of the optical pickup can be obtained simply by rotating the adjustment pin. Adjustment can be performed easily and with high accuracy.

  In the present invention, one end side of a carriage on which an objective lens is mounted is engaged with a screw shaft, and a guided portion provided on the other end side of the carriage is slidably supported by a guide member extending in a linear direction. In the optical pickup transfer mechanism that urges the guided portion to the guide member by the elastic force of the elastic member and transfers the carriage in the extending direction of the guide member as the screw shaft rotates, the adjustment pins are connected to each other. First and second columnar portions having eccentric centers are provided, the first columnar portion is inserted into an insertion hole provided in the guided portion, and an outer peripheral surface of the second columnar portion is guided to the guide. It was set as the structure slidably contacted to a member.

  According to the optical pickup transport mechanism configured as described above, when the adjustment pin is rotated about the first cylindrical portion, the outer peripheral surface of the second cylindrical portion that is eccentric with respect to the first cylindrical portion is the guide member. By rolling up, the guided portion side of the carriage moves up and down with respect to the guide member, so that the angle adjustment of the optical pickup in the tangential direction can be performed easily and with high accuracy.

  In the above configuration, the first and second cylindrical portions of the adjustment pin may have the same size as long as their centers are eccentric, but the outer diameter of the second cylindrical portion is the outer diameter of the first cylindrical portion. It is preferable that the first pin and the second cylindrical portion are completely overlapped with each other along the axial direction while the adjustment pin is easily rotated.

  In the above configuration, the shape of the groove for inserting the jig for rotating the adjustment pin may be any shape, but a cross-shaped groove for inserting the jig is formed on the end surface of the second cylindrical portion. If the lengths of the cross-shaped grooves of the cross-shaped grooves are different from each other, a jig such as a cross-shaped driver can be engaged with the cross-shaped grooves so that the adjustment pin can be reliably rotated and the direction of the cross-shaped grooves can be adjusted. It is preferable that the rotation angle of the adjustment pin can be known by visual observation.

  In the above configuration, a metal guide shaft can be used as the guide member. However, it is preferable that the carriage and the guide member are both formed of synthetic resin and a metal adjustment pin is used. . Thus, if both the carriage including the guided portion and the guide member are made of a synthetic resin molded product, not only the cost and weight can be easily reduced, but also the first metal adjusting pin inserted into the guided portion can be used. Since the cylindrical portion 2 is in sliding contact with the guide member, it is possible to suppress the progress of wear which is a concern when the synthetic resin materials are brought into sliding contact with each other.

  The embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of the optical pickup transport mechanism according to the embodiment, FIG. 2 is a side view of the optical pickup transport mechanism, and FIG. FIG. 4 is a perspective view of an optical pickup and an adjustment pin, FIG. 5 is an enlarged view of a main part of FIG. 4, and FIG. 6 is an explanatory view showing an angle adjustment operation using the adjustment pin.

  In these drawings, reference numeral 1 generally indicates an optical pickup. The optical pickup 1 includes an objective lens 2 and a driving mechanism (not shown) called an actuator, and an optical for irradiating a disk with laser light. A carriage 3 on which elements and the like are mounted is provided. The carriage 3 is formed of a synthetic resin, and a guided portion 4 and a receiving portion 5 are projected from both sides thereof. The guided portion 4 is engaged with a substantially cylindrical guide member 6, and this guide member 6 is integrally formed on one side surface of an opening 8 provided in a mechanism chassis 7 made of synthetic resin. The receiving portion 5 is slidably fitted into a guide shaft 9 disposed on the other side surface of the opening 8. Although not shown, a screw shaft is arranged in parallel with the guide shaft 9 on the side of the receiving portion 5 side of the carriage 3, and the screw shaft screw is provided on the side portion of the receiving portion 5 of the carriage 3. A female screw member for meshing with the part and a leaf spring for applying a resilient force to the female screw member are attached. The screw shaft is rotationally driven in both forward and reverse directions by a thread motor (not shown) mounted on the mechanism chassis 7 so that the entire optical pickup 1 including the carriage 3 is moved in the direction of arrows AA in FIG. (Radial direction). The feed screw mechanism for transporting the optical pickup 1 in the AA direction is not limited to the screw shaft and the female screw member, but a binion provided on the mechanism chassis 7 with a rack provided on the side of the receiving portion 5. It may be driven.

  An insertion hole 10 is formed in the guided portion 4 of the carriage 3, and the insertion hole 10 extends from a side end surface of the guided portion 4 in a direction perpendicular to the extending direction (bus line direction) of the guide member 6. ing. However, the insertion hole 10 is a stepped hole on the entrance side that is larger than the back side, and the small-diameter portion 10a on the back side is a cylindrical hole, but the lower end of the large-diameter portion 10b on the entrance side is notched and opened. doing. A leaf spring 11 is fixed to the bottom surface side of the carriage 3, and the free end of the leaf spring 11 faces the large diameter portion 10 b of the insertion hole 10 as shown in FIGS. 4 and 5. .

  A short-axis adjusting pin 12 made of a metal pin such as stainless steel is inserted into the insertion hole 10, and the adjusting pin 12 has a first cylindrical portion 12a and a second cylindrical portion 12b whose centers are decentered from each other. And have. The outer diameter of the second cylindrical portion 12b is set larger than the outer diameter of the first cylindrical portion 12a, and these first and second cylindrical portions 12a and 12b are completely in the axial direction of the adjusting pin 12. Are overlapping. The first cylindrical portion 12a is inserted into the small diameter portion 10a of the insertion hole 10, and after adjusting the angle in the tangential direction to be described later, the first cylindrical portion 12a is fastened by tightening the screw 13 from the upper surface side of the guided portion 4. The cylindrical portion 12a is firmly fixed in the small diameter portion 10a (see FIG. 3). On the other hand, the 2nd cylindrical part 12b is located in the large diameter part 10b of the insertion hole 10, and the outer peripheral surface lower end part protrudes from opening of the large diameter part 10b. Then, by arranging the guide member 6 between the second cylindrical portion 12 b of the adjustment pin 12 and the free end portion of the plate spring 11, the second cylindrical portion 12 b is guided by the urging force of the plate spring 11. 6 is always in sliding contact. Further, a jig insertion groove 14 is formed on the end face of the second cylindrical portion 12b so that the two groove portions 14a and 14b intersect in a cross shape. As shown in FIG. 6, one groove portion 14a is the other. It is formed longer than the groove portion 14b.

  In the optical pickup transport mechanism configured as described above, when the screw shaft rotates in either the forward or reverse direction using a thread motor (not shown) as a drive source, the rotational force is converted into a linear motion by the female screw member, and the carriage 3 Therefore, the carriage 3 moves in the thrust direction of the guide member 6 and the guide shaft 9 (the direction of arrows AA in FIGS. As a result, the entire optical pickup 1 is transported in the radial direction of the disc (not shown) via the carriage 3, and information recording and reproduction operations can be performed on the disc. Here, the carriage 3 including the guided portion 4 and the receiving portion 5 and the guide member 6 (mechanism chassis 7) that slidably supports the carriage 3 via the guided portion 4 are both resin molded products. Since the guided portion 4 is not directly slidably contacted with the upper surface of the guide member 6, the outer peripheral surface of the second cylindrical portion 12 b of the adjustment pin 12 fixed to the guided portion 4 is slidably contacted with the guide member 6. The progress of wear which is a concern when the synthetic resin materials are brought into sliding contact with each other can be suppressed, and therefore the optical pickup 1 can be transported in a stable posture over a long period of time.

  Next, the angle adjustment operation in the tangential direction of the optical pickup 1 will be described mainly with reference to FIG.

  In the assembled state of the optical pickup 1, the adjustment pin 12 is inserted at a predetermined initial angle with respect to the insertion hole 10, and in this embodiment, as shown in FIG. The longer groove portion 14a is inserted in a direction inclined by 45 degrees with respect to the generatrix direction of the guide member 6. Then, after the optical pickup 1 is incorporated in the disk device, a cross driver (not shown) is engaged with the jig insertion groove 14 of the adjustment pin 12 and rotated to rotate the guide member 6 in the extending direction. A short-axis adjustment pin 12 extending in a direction orthogonal to the first axis 12a rotates about the first cylindrical portion 12a in the direction of the arrow α-β, and accordingly a second protruding from the opening at the lower end of the large-diameter portion 10b. The protrusion amount of the cylindrical part 12b changes. For example, when the adjustment pin 12 is rotated in the direction of the arrow α from the position shown in FIG. 6A, the outer peripheral surface of the second cylindrical portion 12b rolls on the upper surface of the guide member 6, and the second cylindrical portion. The amount of protrusion of 12b from the large diameter portion 10b gradually decreases, and when the adjustment pin 12 is rotated by 135 degrees in the direction of the arrow α as shown in FIG. The amount of protrusion from the diameter portion 10b is minimized. Further, when the adjustment pin 12 is rotated in the direction of the arrow β from the position shown in FIG. 6A, the amount of protrusion of the second cylindrical portion 12b from the large diameter portion 10b gradually increases and rotates 45 degrees. It becomes the maximum and gradually decreases as it rotates further.

  When the amount of protrusion of the second cylindrical portion 12b from the large-diameter portion 10b changes due to the rotation of the adjustment pin 12 in this way, the guided portion 4 side of the carriage 3 moves up and down with respect to the guide member 6 accordingly. Therefore, the angle adjustment of the optical pickup 1 in the tangential direction, that is, the inclination adjustment of the optical axis of the objective lens 2 in the tangential direction can be easily and accurately performed. After adjusting the angle in the tangential direction, the adjustment pin 12 is firmly fixed to the insertion hole 10 by tightening the screw 13 from the upper surface side of the guided portion 4 and using an adhesive as necessary. can do.

  As described above, in the optical pickup transport mechanism according to the present embodiment, the adjustment pin 12 having the first and second cylindrical portions 12a and 12b whose centers are decentered is prepared, and the first cylindrical portion 12a is used as a carriage. 3 is inserted into the insertion hole 10 formed in the guided portion 4 in a rotatable manner, and the outer peripheral surface of the second cylindrical portion 12b is slidably contacted with the upper surface of the guide member 6, so that the optical pickup 1 is incorporated in the disk device. The guided portion 4 side of the carriage 3 can be moved up and down with respect to the guide member 6 by a simple operation of rotating the adjustment pin 12 later, and the angle adjustment of the optical pickup 1 in the tangential direction is simple and highly accurate. Can be done.

  Further, of the two groove portions 14a and 14b intersecting in a cross shape of the jig insertion groove 14 provided on the end face of the adjustment pin 12, one groove portion 14a is formed longer than the other groove portion 14b. Therefore, when adjusting the angle of the optical pickup 1 in the tangential direction, the rotation angle of the adjustment pin 16 can be known by observing the direction of the groove portions 14a and 14b of the jig insertion groove 14.

  Furthermore, since the carriage 3 including the guided portion 4 and the guide member 16 are both resin molded products, and the metal adjustment pin 12 fixed to the guided portion 4 is brought into sliding contact with the guide member 16, Not only can cost reduction and weight reduction be facilitated, but also the progress of wear, which is a concern when the synthetic resin materials are brought into sliding contact with each other, can be suppressed.

It is a perspective view of the optical pick-up transfer mechanism which concerns on an Example. It is a side view of the optical pickup transport mechanism. It is sectional drawing which shows the engaging part of a carriage and a guide member. It is a perspective view of an optical pick-up and an adjustment pin. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the angle adjustment operation | work by an adjustment pin. It is a top view for demonstrating an optical pick-up transfer mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up 2 Objective lens 3 Carriage 4 Guided part 5 Receiving part 6 Guide member 7 Mechanism chassis 9 Guide shaft 10 Insertion hole 10a Small diameter part 10b Large diameter part 11 Leaf spring (elastic member)
12 Adjustment pin 12a First cylindrical portion 12b Second cylindrical portion 13 Screw 14 Jig insertion groove (cross-shaped groove)
14a, 14b Groove

Claims (4)

One end of the carriage on which the objective lens is mounted is engaged with a feed screw mechanism, and a guided portion provided on the other end of the carriage is slidably supported by a guide member extending in a linear direction. In the optical pickup transfer mechanism that urges the guide member by the elastic force of the elastic member and transfers the carriage in the extending direction of the guide member by the driving force of the feed screw mechanism,
The adjustment pin is provided with first and second cylindrical portions whose centers are decentered, the first cylindrical portion is inserted into an insertion hole provided in the guided portion, and the second cylindrical portion is An optical pickup transfer mechanism characterized in that an outer peripheral surface is brought into sliding contact with the guide member.   In Claim 1, While setting the outer diameter dimension of the said 2nd cylindrical part larger than the outer diameter dimension of the said 1st cylindrical part, these 1st and 2nd cylindrical parts are set along an axial direction. An optical pickup transport mechanism that is completely overlapped.   3. The method according to claim 1, wherein a cross-shaped groove for inserting a jig is formed on an end surface of the second cylindrical portion, and the lengths of the cross-shaped grooves perpendicular to each other are different. Optical pickup transfer mechanism. 4. The optical pickup transport mechanism according to claim 1, wherein both the carriage and the guide member are made of synthetic resin, and the adjustment pin is made of metal.

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