CN100458960C - Optical pickup adjusting mechanism of optical disk drive and manufacturing method thereof - Google Patents

Abstract

An optical pickup head adjusting mechanism of an optical disc drive includes a base, a clamp and a guide rod. The clamp is coupled to the base and has a groove spirally surrounding a surface of the clamp. The guide rod is positioned on the base, a first end of the guide rod is in sliding fit with the groove, and meanwhile, the optical reading head is arranged on the guide rod. When the clamp rotates, the groove and the guide rod move relatively to guide the first end to move up and down so as to adjust the inclination angle of the guide rod.

Description

Optical pickup head adjustment mechanism of optical disk drive and manufacturing method thereof

technical field

The invention relates to an optical pickup head adjustment mechanism of an optical disc drive and a manufacturing method thereof, in particular to an adjustment mechanism for focusing the optical pickup head on an optical disc by adjusting the inclination angle of a guide rod and a manufacturing method thereof.

Background technique

With the rapid development of personal computers, the market of computer peripheral products has also grown rapidly. Computer peripheral products such as hard disk drives, CD-ROM drives, scanners, printers, etc. have all become necessary tools for modern offices. Among these computer peripheral products, the optical disk drive is a storage medium commonly used at present. In addition to providing a large storage capacity, the optical disc drive also provides a variety of storage data formats and the benefits of long-term data preservation. Especially with the development of a new generation of digital video discs (Digital Versatile Disc, DVD), providing up to 17GB of storage capacity and higher quality image and audio output, making the application of optical disc drives more extensive.

Please refer to FIG. 1 , a typical optical disk drive structure includes a spindle motor 100 , an optical pickup head 200 and a transmission mechanism 300 . Wherein, the spindle motor 100 is used to drive the optical disc (not shown) to rotate, and the transmission mechanism 300 is used to drive the optical pick-up head 200 to a proper position so that the optical pick-up head 200 can accurately track (tracking) and Read the data of the disc after focusing.

The transmission mechanism 300 includes a guide rod 320 , a driving motor (not shown) and a lead screw 340 . Wherein, the guide rod 320 and the lead screw 340 are parallel to each other and extend outward from the position of the spindle motor 100 . The opposite sides of the optical pickup head 200 are respectively supported by the guide rod 320 and the lead screw 340 . Therefore, the optical pickup 260 can move along the guide rod 220 by driving the lead screw 340 to rotate through a driving motor (not shown, generally a stepping motor).

Therefore, obviously, the guide rod 320 and the lead screw will affect the angle of the optical axis of the laser beam of the optical pick-up head 200 relative to the optical disc. Basically, the direction of the optical axis of the laser light of the optical pickup head 200 must be perpendicular to the surface of the optical disc in order to accurately read the data of each track on the optical disc. A small error in the direction of the optical axis will affect the speed and accuracy of data reading. Therefore, an optical pickup head adjustment mechanism is usually designed in the optical disk drive to finely adjust the optical axis angle of the optical pickup head 200, so as to compensate for errors in part size or assembly process, and to ensure product yield.

Please refer to FIG. 2A and FIG. 2B , which are schematic diagrams of a typical optical pickup head adjustment mechanism. The optical pickup adjustment mechanism includes a base 410 , a holder 420 , an elastic piece 430 , a first locking screw 440 , a second locking screw 450 and an adjusting screw 460 . Wherein, the clamp 420 is locked on the base 410 through the first locking screw 440 , and one end 320 a of the guide rod 320 is positioned on the clamp 420 . The elastic piece 430 is locked on the base 410 by the second locking screw 450 , and its free end is pressed on the guide rod 320 to fix the guide rod 320 and prevent the guide rod 320 from moving upward. The adjustment screw 460 is screwed on the base 410 and located directly below the guide rod 420 . By rotating the adjustment screw 460 to change the length protruding from the base 410 , an upward force can be applied to the guide rod 320 to achieve the purpose of adjusting the inclination angle of the guide rod 320 .

As shown in the figure, the optical reading head adjustment mechanism uses six parts including a base 410, a clamp 420, a shrapnel 430, a first locking screw 440, a second locking screw 450, and an adjusting screw 460 to achieve adjustment. The purpose of the inclination angle of the guide rod 320. In the process of assembling the optical disc drive, corresponding assembly steps must also be performed. Therefore, in addition to increasing the complexity of the mechanism and affecting the reliability of the product, considerable labor costs and assembly costs must also be spent.

Therefore, how to simplify the design of the adjustment mechanism of the optical pickup head to improve the stability of the optical disc drive, and at the same time, achieve the purpose of reducing the production cost and labor cost is a very important issue in the design of the optical disc drive mechanism.

Contents of the invention

The main purpose of the present invention is to provide an optical pickup adjustment mechanism and a manufacturing method thereof that can reduce the number of parts used in the assembly process and reduce the cost of assembly and manufacturing.

The optical pickup adjustment mechanism of the present invention includes a base and a fixture. Wherein, the base is made of metal material and has a through hole, the fixture is an integrally formed component by injection molding and is pivotally connected to the base, and the surface of the fixture has a groove surrounding it, and the groove corresponds to the base The upper surface of the upper surface presents ups and downs, and the clamp also has an opening, which penetrates upwards from the groove to the top surface of the clamp. The optical reading head is arranged on a guide rod, and the guide rod has a first end, and the first end is lowered into the groove through the opening and slides into the groove. When the fixture rotates, the groove and the guide rod produce relative motion to guide the first end to move along the direction perpendicular to the base, so as to adjust the inclination angle of the guide rod.

The manufacturing method of the optical pickup head adjustment mechanism of the present invention is to firstly make at least one through hole on the base. Then, a jig is manufactured by injection molding to pass through the through hole to be pivotally connected to the base. The surface of the fixture has a groove surrounding it, and the groove presents ups and downs corresponding to the upper surface of the base. Next, place a first end of the guide rod into the groove. Then, assemble the optical pickup head on the guide rod. Next, check the direction of the optical axis of the optical reading head, if there is any deviation, then rotate the fixture to make the groove and the guide rod move relative to each other, and guide the first end to move along the direction perpendicular to the base to adjust the inclination of the guide rod angle.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a typical optical disk drive architecture.

FIG. 2 is a schematic diagram of a typical optical pickup adjustment mechanism.

FIG. 3A is a schematic diagram of a preferred embodiment of the optical disc drive of the present invention.

FIG. 3B is a schematic cross-sectional view of the clamp in FIG. 3A .

4A to 4C are schematic diagrams of a preferred embodiment of the manufacturing method of the optical pickup adjustment mechanism of the present invention.

FIG. 4D is a schematic diagram of adjusting the inclination angle of the guide rod by rotating the fixture according to the present invention.

Detailed ways

Please refer to FIG. 3A , which is a schematic diagram of a preferred embodiment of the optical disc drive of the present invention. As shown in the figure, the optical disk drive has a spindle motor 100, an optical pickup head 200, a transmission mechanism 300 and an optical pickup adjustment mechanism. Wherein, the spindle motor 100 is used to drive an optical disc (not shown) to rotate. The transmission mechanism 300 has a guide rod 320 , a driving motor (not shown) and a lead screw 340 . The guide rod 320 and the lead screw 340 are parallel to each other and extend outward from the position of the spindle motor 100 . The opposite sides of the optical pickup head 200 are respectively supported by the guide rod 320 and the lead screw 340 . By driving the motor to drive the lead screw to rotate, the optical pickup head 200 can be driven to a proper position, so that the optical pickup head 200 can read the data of the optical disc after precise tracking and focusing.

The optical pickup adjustment mechanism is used to adjust the direction of the optical axis of the optical pickup 200 to be perpendicular to the surface of the optical disc during assembly, that is, to make the optical axis of the optical pickup 200 parallel to the direction of the spindle motor 100. Rotation axis direction. As shown in FIG. 3A , the optical pickup adjustment mechanism includes a base 510 , a fixture 520 and a positioning device 530 . Wherein, the clamp 520 is pivotally connected to the base 510 , and the surface of the clamp 520 has a groove 522 . At the same time, please refer to FIG. 3B , a first end 320a of the guide rod 320 is slid in the groove 522 , and its second end 320b is assembled in a bearing 360 to be installed on the base 510 . In addition, the positioning device 530 is installed adjacent to the fixture 520 and includes two parallel cylinders 532 abutting against opposite sides of the guide rod 320 to limit the horizontal (left and right) movement of the guide rod 320 .

Please refer to FIG. 3B , the jig 520 has a cylindrical shape, and the distance between the groove 522 formed on the surface of the jig 520 and the upper surface 510 a of the base 510 is fluctuating. Therefore, by rotating the clamp 520 to make the first end 320a of the guide rod 320 slide along the groove 522, the first end 320a of the guide rod can be moved perpendicular to the direction of the base 510, thereby adjusting the inclination angle of the guide rod 320. , to achieve the purpose of adjusting the direction of the optical axis of the optical pickup head 200 . Basically, the projection pattern of the aforementioned groove 522 on the base 510 presents a pattern similar to concentric circles, so as to ensure that the first end 320 a of the guide rod 320 can slide smoothly in the groove 522 without being blocked or disengaged. As for a preferred embodiment, the groove 522 may spiral around the surface of the fixture 520 .

Secondly, in order to facilitate the assembly, the surface of the clamp 520 further has an opening 526 , which penetrates upwards from the groove 522 to the top surface 520a of the clamp. The first end 320a of the guide rod is inserted downward into the groove 522 through the opening 526 . In addition, in order to conveniently rotate the clamp 520 to adjust the optical axis direction of the optical pickup 200 , the top surface 520 a of the clamp further has a groove 524 to facilitate rotation.

As shown in FIG. 3B , it is a schematic cross-sectional view of the clamp 520 in FIG. 3A . As shown in the figure, the clamp 520 can be divided into an upper part A, a shaft part B and a lower part C. Wherein, the upper part A is located above the base 510 , that is, the part where the groove 522 is formed. The shaft part B fits into a through hole 512 made on the base 510 . The lower part C is located below the base 510 . Moreover, the width of the widest part of the upper part A and the lower part C is greater than the diameter of the through hole 512 to prevent the clamp 520 from moving up and down.

Basically, since the optical pickup head 200 is disposed on the guide rod 320 , the change of the inclination angle of the guide rod 320 will affect the direction of the optical axis of the optical pickup head 200 . Conversely, if there is an error in the direction of the optical axis of the optical pickup head 200 , it can be corrected by changing the inclination angle of the guide rod 320 . Simultaneously, since the spindle motor 100 of the optical disc drive is also installed on the base 500, therefore, the base 500 can be used as the reference platform of the optical pick-up adjustment mechanism of the present invention, and by adjusting the guide rod 320 relative to the base The inclination angle of 500 can achieve the purpose of correcting the direction of the optical axis of the optical pickup head 200 .

Please refer to FIG. 4A to FIG. 4C , which are a preferred embodiment of the manufacturing method of the optical pickup adjustment mechanism 500 of the present invention. First, as shown in FIG. 4A , a through hole 512 and a groove 514 are formed on a base 510 . Then, as shown in FIG. 4B , in the manner of injection molding, a fixture 520 is made at the through hole 512 to be pivoted to the base 510, and at the same time, a positioning device 530 is made above the groove 514 to fit into inside the groove. Basically, injection molding is to inject polymer melt (heated from thermoplastic resin) into a given mold, and the finished product can be completed after cooling and setting. As far as the present invention is concerned, the base 510 is made of metal to avoid deformation of the base 510 during the injection molding process. At the same time, it can also prevent the clamp 520 from adhering to the base 510 to ensure that the clamp 520 can rotate relative to the base 510 . Next, as shown in FIG. 4C, the first end 320a of the guide rod 320 is inserted downward into the groove 522 through the opening 526, and the optical reading head 200 is assembled on the guide rod 320 to complete the optical reading of the present invention. Fabrication of the head adjustment mechanism.

Generally speaking, the direction of the optical axis of the optical pick-up head 200 must be detected before the optical disc drive is shipped. If the direction of the optical axis of the optical pickup head 200 deviates, as shown in FIG. 4D, the position of the first end 320a of the guide rod can be changed by rotating the clamp 520, and the inclination angle of the guide rod 320 can be adjusted (as shown in the figure, the guide rod The rod is moved from 320 to 320 ′) to correct the optical axis direction of the optical pickup head 200 .

Compared with the traditional optical pickup adjustment mechanism, the optical pickup adjustment mechanism of the present invention has the following advantages:

1. The adjusting mechanism of the optical reading head of the present invention can achieve the purpose of adjusting the inclination angle of the guide rod 320 only by using the clamp 520 and the positioning device 530 . On the contrary, the traditional optical pickup head adjustment mechanism needs to use components such as the clamp 420 , the elastic piece 430 , the first locking screw 440 , the second locking screw 450 , and the adjusting screw 460 . Therefore, the adjustment mechanism of the optical pick-up head of the present invention has obvious improvements in terms of parts cost and assembly cost.

2. Generally speaking, the less the number of materials used, the higher the stability of the device. Under this principle, the optical pickup adjustment mechanism of the present invention can obtain higher structural stability, so as to improve the product stability of the optical disc drive.

The above is to use preferred embodiments to describe the present invention in detail, but not to limit the scope of the present invention, and those who are familiar with the technology can understand that equivalent changes and adjustments can be made appropriately without losing the essence of the present invention. , nor depart from the spirit and scope of the present invention.

Claims (8)

1. An optical pickup adjustment mechanism, which is installed in the optical disc drive to adjust the optical axis direction of the optical pickup, the optical pickup adjustment mechanism includes: A base, the base is made of metal and has a through hole; A fixture, the fixture is an integrally formed component by injection molding, the fixture is axially connected to the base, and the surface of the fixture has a groove surrounding it, and the groove is corresponding to the upper surface of the base. Undulations, the clamp also has an opening, which penetrates upwards from the groove to the top surface of the clamp; and The optical reading head is arranged on a guide rod, and the guide rod has a first end, and the first end is inserted downward into the groove through the opening and slid in the groove, when the clamp Rotating, the groove and the guide rod produce relative motion to guide the first end to move along the direction perpendicular to the base, so as to adjust the inclination angle of the guide rod. 2. The optical pickup adjustment mechanism as claimed in claim 1, wherein the jig is made of thermoplastic resin. 3. The optical pickup adjustment mechanism as claimed in claim 1, wherein the groove is spirally surrounding the surface of the fixture. 4. The optical reading head adjustment mechanism according to claim 1, further comprising a positioning device located on the base, the positioning device has two mutually parallel cylinders, which lean against the opposite sides of the guide rod on both sides to limit the amount of movement of the guide rod in the horizontal direction. 5. The optical pickup adjustment mechanism as claimed in claim 1, wherein the clamp can be divided into an upper part, a rotating shaft part and a lower part, the upper part is located above the base, and the rotating shaft part is matched with In the through hole, the lower part is located below the base, and the width of the widest part of the upper part and the lower part is larger than the diameter of the through hole, so as to prevent the clamp from moving up and down. 6. A manufacturing method of an optical pickup adjusting mechanism, the optical pickup adjusting mechanism is installed in an optical disc drive to adjust the optical axis direction of the optical pickup, the manufacturing method comprising: provide a base; making at least one through hole on the base; In the way of injection molding, a fixture is made at the through hole to be pivoted to the base, the surface of the fixture has a groove surrounding it, and the groove presents ups and downs corresponding to the upper surface of the base; placing a first end of the guide rod into the groove; assembling the optical pickup on the guide rod; and Rotating the fixture causes the groove and the guide rod to move relative to each other to guide the first end to move along a direction perpendicular to the base, so as to adjust the inclination angle of the guide rod. 7 . The manufacturing method according to claim 6 , wherein in the step of manufacturing the fixture, a positioning device is manufactured on the base at the same time to limit the movement amount of the guide rod in the horizontal direction. 8 . 8. The manufacturing method according to claim 6, wherein the base is made of metal, and the fixture is made of thermoplastic resin.

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