JP4453609B2 - Optical pickup device - Google Patents

Description

  The present invention relates to an optical pickup device for reproducing and recording information on an optical disc such as a CD or DVD as an information recording medium.

  In general, as shown in FIGS. 7 and 8, the optical pickup device is mainly composed of a main chassis 1 and a drive chassis 2. FIG. 7 is a top view showing a state after assembly of a conventional general optical pickup device, and FIG. 8 is a top view showing an exploded state of the optical pickup device.

  The main chassis 1 is a molded product of synthetic resin such as polystyrene (PS), for example, and a disk tray (not shown) is inserted into the main chassis 1 from the front (the lower side in FIGS. 7 and 8) from inside to outside (FIGS. 7 and 8). In FIG. 8, it is supported so that it can be inserted and removed in the vertical direction. Then, the optical disk is placed on the disk tray drawn out of the main chassis 1, and the disk tray is fed into the main chassis 1, whereby the optical disk is stored in the main chassis 1.

  The drive chassis 2 is a molded product of synthetic resin such as polyphenylene ether (PPE), for example, and has left and right side surfaces 2a and 2b (left and right side surfaces in FIGS. 7 and 8) near one end 2c (upper side in FIGS. 7 and 8). ), Support shafts 3A and 3B projecting coaxially with each other are formed integrally with the drive chassis 2. Each of these support shafts 3A, 3B is rotatably supported by the main chassis 1. Details of the support structure will be described later. The drive chassis 2 rotates about the support shafts 3A and 3B with respect to the main chassis 1 to thereby record the recording surface of the optical disk stored in the main chassis 1 (the back surface of the paper surface in FIGS. 7 and 8). Side) and move toward / separate (in FIG. 7 and FIG. 8, the movement in the direction perpendicular to the paper surface).

  Further, the drive chassis 2 is equipped with an optical head (not shown) for reading information recorded on the recording surface of the optical disc and writing information on the recording surface. Further, the drive chassis 2 includes a chucking plate (not shown) that chucks the vicinity of the center of the optical disk in order to rotate the optical disk in a state of being closest to the optical disk, and a spindle motor that applies a rotational force to the chucking plate. A first drive mechanism (not shown) is mounted. Further, in the drive chassis 2, in order to reciprocate the optical head in the radial direction along the recording surface of the optical disc in the state closest to the optical disc, all of them are an optical head traveling guide, a rack, a gear, an electric motor, etc. (not shown). The second drive mechanism is mounted. The driving force from the electric motor in the second driving mechanism is also used for the rotation of the drive chassis 2 with respect to the main chassis 1 and the insertion / removal of the disk tray.

Next, details of the support structure in which the main chassis 1 can rotate the support shafts 3A and 3B of the drive chassis 2 will be described with reference to FIGS. 9 to 16 in addition to FIGS. FIG. 9 shows a main part in a state after assembly of the conventional optical pickup device, that is, of the support shafts 3A and 3B formed on the left and right side surfaces 2a and 2b of the drive chassis 2, typically on the left side surface 2a side. It is a top view which shows the support shaft 3A vicinity. 10 is a bottom view of FIG. 9, FIG. 11 is an AA sectional view of FIG. 9, and FIG. 12 is a BB sectional view of FIG. 13 is a top view showing a main part similar to FIG. 9 in a state where the optical pickup device is being assembled, FIG. 14 is a bottom view of FIG. 13, and FIG. 15 is a cross-sectional view taken along line AA of FIG. 13 is a cross-sectional view taken along the line CC of FIG. 13, and FIG. 16 is a cross-sectional view taken along the line DD of FIG.

  In the main chassis 1, a receiving portion 4 and a projecting piece portion 5 are formed integrally with the main chassis 1 in order to rotatably support the support shaft 3 </ b> A. Specifically, the receiving portion 4 receives the support shaft 3A from the other end 2d side (the lower side in FIGS. 7 to 16) of the drive chassis 2 and is in contact with the received support shaft 3A. It has 4th contact surface 4a-4d. The first contact surface 4a contacts the peripheral surface (lower side in FIGS. 7 to 16) in the direction (downward in FIGS. 7 to 16) of the peripheral surface of the support shaft 3A toward the other end 2d. . The second and third contact surfaces 4b and 4c are perpendicular to the direction toward the other end 2d of the peripheral surface of the support shaft 3A (in FIGS. 7 to 10, 13 and 14, the direction perpendicular to the paper surface). 11, FIG. 12, FIG. 15 and FIG. The fourth contact surface 4d is an end surface of the supporting shaft 3A (on the left side in FIGS. 7 to 9 and 13, on the right side in FIGS. 10 and 14, and on the paper surface in FIGS. 11, 12, 15 and 16). Touch the back side. Here, the gap between the second contact surface 4b and the third contact surface 4c is designed to be approximately the same as the shaft diameter of the support shaft 3A.

  On the other hand, the projecting piece portion 5 projects toward the first contact surface 4a, and the clearance between the tip surface 5a and the first contact surface 4a is designed to be slightly larger than the shaft diameter of the support shaft 3A. Yes. From this protrusion 5 toward the back side with respect to the paper surface in FIGS. 7 to 9 and 13 (to the near side with respect to the paper surface in FIGS. 10 and 14, FIGS. 11, 12, 15 and The lever 5b protrudes (toward the right in FIG. 16). Then, the direction in which the lever 5b faces the left side surface 2a of the drive chassis 2 (the left direction in FIGS. 7 to 9 and 13, the right direction in FIGS. 10 and 14, and FIGS. 11 and 12). 15 and 16, when pressed to the back side of the paper (see the solid line arrows in FIGS. 13 and 14), the projecting piece 5 is elastically deformed in the pressing direction. When the pressing is released, the elastic deformation of the projecting piece 5 is restored by the restoring force (see solid line arrows in FIGS. 9 and 10).

  In addition, the same receiving part 4 and the protruding piece part 5 are formed symmetrically with respect to the support shaft 3B formed on the right side surface 2b of the drive chassis 2.

  As a procedure for assembling the drive chassis 2 to the main chassis 1, first, as shown in FIGS. 13 to 16, the left and right protruding pieces 5 and 5 in the main chassis 1 are pressed against the lever 5 b. Elastically deformed. As a result, the left and right receiving portions 4 and 4 are opened. Thereafter, the left and right support shafts 3A, 3B in the drive chassis 2 are inserted into the receiving portions 4, 4. Next, as shown in FIGS. 7 and 9 to 12, the pressure on the lever 5 b is released, and the elastic deformation of the projecting piece portions 5 and 5 is restored.

  Thus, each of the support shafts 3A and 3B is in contact with the first to fourth contact surfaces 4a to 4d and 4a to 4d of the receiving portions 4 and 4 while facing the remaining end 2c (FIGS. 7 to 5). 16 (upward direction in FIG. 7 to FIG. 16) is in contact with the tip surfaces 5 a and 5 a of the projecting pieces 5 and 5, and as a result, the drive chassis 2 is connected to the main chassis 1. It becomes rotatable with respect to it.

  Incidentally, in the optical pickup device, it is important to suppress inadvertent vibration of the drive chassis 2 caused by the rotation of the optical disk. This is because if the vibration is excessive, it may be difficult to reproduce or record information on the optical disk, or an unpleasant vibration sound may be generated. Such a situation is conspicuous particularly in the case of an optical disc with an eccentric center of gravity (hereinafter, sometimes referred to as “eccentric disc”).

Therefore, in the conventional optical pickup device, for example, as disclosed in Patent Documents 1 and 2, the drive chassis 2 is separately supported by an elastic member such as a spring or rubber with respect to the main chassis 1, and the elastic member The vibration of the drive chassis 2 was attenuated and suppressed.
JP 2002-133848 A Japanese Patent Laid-Open No. 11-16328

  However, the vibration suppression structure of the drive chassis 2 in the conventional optical pickup device described above is disadvantageous in terms of cost because an elastic member is required as a separate part.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an optical pickup device that can suppress vibration of a drive chassis with a simple configuration.

In order to achieve the above object, the present invention provides a main chassis of a synthetic resin molded product in which an optical disk is accommodated, and the main chassis so as to move toward and away from the recording surface of the optical disk accommodated in the main chassis. And an optical head, a first drive mechanism for rotating the optical disc in the approaching state, and the optical head in the approaching state in a radial direction along the recording surface of the optical disc. And a drive chassis on which a second drive mechanism for reciprocal movement is mounted. Further, the support shafts are provided on both side surfaces near one end of the drive chassis so as to protrude coaxially with each other. The main chassis receives the support shafts from the other end side of the drive chassis, and contacts a peripheral surface in a direction toward the other end of the peripheral surfaces of the support shafts. And a receiving portion having second and third contact surfaces that contact each peripheral surface in a direction perpendicular to the direction toward the other end, and a fourth contact surface that contacts the end surface of each of the support shafts. And projecting toward the first contact surface from a location different from the location where the receiving portion is formed, and after being elastically deformed by being pressed in a direction opposite to the direction toward the side surface of the drive chassis, After each supporting shaft is received by each receiving portion and then the pressing is released, a protruding piece portion whose tip surface contacts the peripheral surface in the direction toward the one end of the peripheral surface of each supporting shaft; Is formed by integral molding with the main chassis. One of the projecting piece portions is integrally formed with a projecting portion that comes into contact with the end surface of the support shaft while receiving an elastic restoring force accompanying release of the pressing to the projecting piece portion. The vibration generated in the drive chassis due to the elastic deformation of the projecting piece itself is damped, and the side surface side of the drive chassis among the corners including the tip surface of each projecting piece The corners of the support shafts are rounded, and in the returning process of the projecting piece portion where the pressing is released by the rounded chamfered portion, the tip ends of the peripheral surfaces of the support shafts without interfering with the support shafts. It is comprised so that it may reach to the position which contacts.

  In such a configuration, the drive chassis can rotate with respect to the main chassis by the support shafts being contacted and supported by the receiving portions and the projecting piece portions. Since the drive chassis receives an elastic restoring force from the protrusion of the protruding piece that contacts the end surface of one of the support shafts, vibration generated in the drive chassis is caused by elastic deformation of the protruding piece itself. Attenuated and suppressed. This can be achieved by adding a protrusion to one of the protrusion pieces.

  Further, each of the projecting pieces accompanying the release of the pressure on each projecting piece part is formed by rounding the corner part on the side surface side of the drive chassis among the corner parts including the front end surface of each projecting piece part. In the return process of the elastic deformation of the portion, interference between each projecting piece and the end surface or peripheral surface of each support shaft is prevented.

  In view of practicality, it is preferable that the drive chassis is a synthetic resin molded product, and each of the support shafts is formed by integral molding with the drive chassis.

  According to the optical pickup device of the present invention, the vibration generated in the drive chassis is attenuated and suppressed by the elastic deformation of the projecting piece itself that elastically contacts the end surface of one of the support shafts. The drive chassis does not inadvertently vibrate during the reproduction and recording of all information, and the information can be stably reproduced and recorded on the eccentric gravity disk.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the optical pickup device according to the first embodiment of the present invention will be described. FIG. 1 is a top view showing a state after assembly of an optical pickup device common to each embodiment of the present invention, and FIG. 2 is a top view showing an exploded state of the optical pickup device. FIG. 3 is a top view showing a main part of the optical pickup device according to the first embodiment after assembly, and FIG. 4 is a bottom view of FIG. In these drawings, portions having the same names and performing the same functions as those in FIGS. 7 to 16 are denoted by the same reference numerals, and redundant description will be omitted as appropriate. The same applies to the second embodiment to be described later. 3 and 4 show the vicinity of the support shaft 3A on the left side surface 2a side of the support shafts 3A and 3B formed on the left and right side surfaces 2a and 2b of the drive chassis 2.

  In the present embodiment, as in the configuration of the conventional optical pickup device, the left and right side surfaces 2a and 2b of the drive chassis 2 are formed with support shafts 3A and 3B that are coaxially projected from the drive chassis 2 by integral molding. Has been.

The main chassis 1 is formed with receiving portions 4 and 4 and projecting pieces 5 and 5 at different locations by integral molding with the main chassis 1 in order to rotatably support the support shafts 3A and 3B. Has been. However, among the left and right support shafts 3A and 3B of the drive chassis 2, the receiving portion 4 and the projecting piece portion 5 for supporting the support shaft 3B on the right side surface 2b side are the same as those in the conventional optical pickup device. However, the receiving portion 4 and the projecting piece portion 5 for supporting the support shaft 3A on the other left side surface 2a side are different from the configuration in the conventional optical pickup device in the following points.

  The projecting piece 5 for supporting the support shaft 3A has an opposite side to the left side 2a side of the drive chassis 2 in the corners including the front end surface 5a (the left side in FIG. 3 and the right side in FIG. 1 and FIG. 2 is provided with a protrusion 5c that protrudes beyond the tip surface 5a from the corner of the left side)). Further, the receiving portion 4 for supporting the supporting shaft 3A is formed in such a manner that the vicinity including the fourth contact surface 4d which is a component thereof does not interfere with the protruding portion 5c of the protruding piece portion 5. Yes. The formation of the protrusion 5c and the receiving portion 4 can be easily realized by locally correcting the engraving shape of the mold for molding the main chassis 1.

  When the drive chassis 2 is assembled to the main chassis 1, first, the left and right projecting pieces 5 and 5 in the main chassis 1 are elastically deformed by pressing against the lever 5 b, thereby Each receiving part 4, 4 is opened. Thereafter, the left and right support shafts 3A, 3B in the drive chassis 2 are inserted into the receiving portions 4, 4. Next, the pressure on the lever 5b is released.

  As a result, for the support shaft 3B on the right side surface 2b side of the drive chassis 2, the first to third contact surfaces 4a to 4c of the receiving portion 4 are in contact with the peripheral surface, and the end surface of the receiving portion 4 is the end surface thereof. 4 contact surface 4d contacts. Here, the projecting piece portion 5 returns to its elastic deformation as the lever 5b is released, and the tip end surface 5a of the projecting piece portion 5 is directed to the one end 2c of the support shaft 3B (upward in FIGS. 1 to 4). It will be in the state which contacted the surface (the upper side in FIGS. 1-4).

  On the other hand, for the support shaft 3A on the left side surface 2a side of the drive chassis 2, the first to third contact surfaces 4a to 4c of the receiving portion 4 are in contact with the peripheral surface, and the fourth end of the receiving portion 4 is in contact with the end surface. The contact surface 4d comes into contact. Here, the projecting piece 5 tries to return to elastic deformation as the lever 5b is released, but in the process, the projecting portion 5c comes into contact with the end surface of the support shaft 3A, and the projecting piece 5 itself remains as it is. The projecting portion 5c is in contact with the end surface of the support shaft 3A while receiving an elastic restoring force, and at the same time, the peripheral surface in the direction in which the front end surface 5a of the projecting piece portion 5 faces the one end 2c of the support shaft 3A. It will be in the state which touched.

  Thus, the support shafts 3A and 3B are contacted and supported by the receiving portions 4 and 4 and the protruding piece portions 5 and 5, and as a result, the drive chassis 2 can be rotated with respect to the main chassis 1.

  In such a configuration, the drive chassis 2 is supported so as to be rotatable with respect to the main chassis 1, but the drive chassis 2 further has an end surface of the support shaft 3 </ b> A on the right side surface 2 b side. Since the elastic restoring force is received from the projecting portion 5c of the projecting piece portion 5 that contacts the drive piece 2, the vibration generated in the drive chassis 2 is attenuated and suppressed by the elastic deformation of the projecting piece portion 5 itself. Therefore, the drive chassis 2 does not inadvertently vibrate during information reproduction or recording on the optical disc, and information reproduction or recording on the eccentric gravity center disc can be performed stably.

  FIG. 5 is a top view showing the main part in a state after the optical pickup device is assembled, and FIG. 6 is a bottom view of FIG.

  As shown in FIG. 5 or FIG. 6, the left and right side surfaces 2a, 2b of the drive chassis 2 in the corners including the tip surfaces 5a, 5a of the projecting pieces 5, 5 in the main chassis 1 (see FIG. The corners on the right side in FIG. 5 and the left side in FIG. 6 are rounded. The formation of the R chamfer can be easily realized by locally correcting the engraved shape of the mold for molding the main chassis 1.

  With this configuration, the peripheral surfaces of the support shafts 3A and 3B after assembly are always on the tip surfaces 5a and 5a of the projecting pieces 5 and 5 and the first contact surfaces 4a and 4a. When the clearance between the tip surfaces 5a and 5a of the projecting pieces 5 and 5 and the first contact surfaces 4a and 4a is designed to be approximately the same as the shaft diameter of the support shafts 3A and 3B so as to come into contact with each other Even when the drive chassis 2 is assembled to the main chassis 1, after the support shafts 3A and 3B are received in the receiving portions 4 and 4, the protrusions are released as the levers 5 b are released. When the elastic deformation of the pieces 5 and 5 is released, the protruding pieces 5 and 5 do not interfere with the end surfaces or peripheral surfaces of the support shafts 3A and 3B in the returning process. 5 reaches the proper position where the front end surfaces 5a and 5a come into contact with the peripheral surfaces of the support shafts 3A and 3B. Therefore, no assembly failure occurs.

  That is, each support shaft 3A, 3B always has the first to fourth contact surfaces 4a to 4d, 4a to 4d of the receiving portions 4 and 4 and the projecting piece portions 5 without any defective assembly. The drive chassis 2 can be assembled to the main chassis 1 while being in contact with the front end surfaces 5a and 5a. Therefore, the drive chassis 2 can be rotated with respect to the main chassis 1 around the support shafts 3A and 3B without any backlash. As a result, it is possible to suppress the vibration of the drive chassis 2 from occurring.

  In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the protruding portion 5c may be formed on the protruding piece portion 5 for supporting the support shaft 3B on the right side surface 2b side of the drive chassis 2.

  The present invention is useful for an optical pickup device for reproducing and recording information on an optical disk.

It is a top view which shows the state after the assembly of the optical pick-up apparatus of this invention. It is a top view which shows the decomposition | disassembly state of the optical pick-up apparatus of FIG. It is a top view which shows the principal part in the state after the assembly of the optical pick-up apparatus of this invention. FIG. 4 is a bottom view of FIG. 3. It is a top view which shows the principal part in the state after the assembly of the optical pick-up apparatus of this invention. FIG. 6 is a bottom view of FIG. 5. It is a top view which shows the state after the assembly of the conventional general optical pick-up apparatus. It is a top view which shows the decomposition | disassembly state of the optical pick-up apparatus of FIG. It is a top view which shows the principal part in the state after the assembly of the conventional optical pick-up apparatus partially shared also in this invention. FIG. 10 is a bottom view of FIG. 9. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows the principal part in the state in the middle of the assembly of the conventional optical pick-up apparatus partially shared also in this invention. FIG. 14 is a bottom view of FIG. 13. It is CC sectional drawing of FIG. 13 equivalent to the AA cross section of FIG. It is DD sectional drawing of FIG. 13 equivalent to the BB cross section of FIG.

1 main chassis 2 drive chassis 2a left side surface 2b right side surface 2c one end 2d other end 3A support shaft 3B support shaft 4 receiving portion 4a first contact surface 4b second contact surface 4c third contact surface 4d fourth contact surface 5 Protrusion 5a Tip 5b Lever 5c Protrusion

Claims (2)

A main chassis of a synthetic resin molded product in which an optical disk is stored;
The main chassis is rotatably supported about a support shaft so as to move toward and away from the recording surface of the optical disk stored in the main chassis, and the optical head rotates the optical disk in the approached state. A first drive mechanism for driving, and a drive chassis equipped with a second drive mechanism for reciprocating the optical head in a radial direction along the recording surface of the optical disc in an approaching state,
On both side surfaces near one end of the drive chassis, the support shafts are provided so as to protrude coaxially with each other,
In the main chassis,
A first contact surface that receives each of the support shafts from the other end side of the drive chassis and contacts a peripheral surface in a direction toward the other end of the peripheral surfaces of the support shafts, and the other end A receiving portion having second and third contact surfaces that contact each peripheral surface in a direction perpendicular to the direction of facing, and a fourth contact surface that contacts the end surface of each of the support shafts;
After projecting toward the first contact surface from a location different from the location where the receiving portion is formed, and after being elastically deformed by being pressed in a direction opposite to the direction facing the side surface of the drive chassis, After each of the support shafts is received in the receiving portion, and then the pressing is released, a projecting piece portion whose tip surface comes into contact with the peripheral surface in the direction toward the one end of the peripheral surface of each of the support shafts;
In the optical pickup device formed by integral molding with the main chassis,
One of the projecting pieces is integrally formed with a projecting portion that comes into contact with the end surface of the support shaft while receiving an elastic restoring force accompanying release of the pressing to the projecting piece. The vibration generated in the drive chassis due to the elastic deformation of the projecting piece itself is damped,
Of the corners including the front end surface of each of the projecting pieces, the corners on the side surface of the drive chassis are chamfered, and the chamfered portion of the projecting piece is released by the chamfered portion. An optical pickup device configured so that, in a returning process, a tip of the optical pickup device reaches a position in contact with a peripheral surface of each support shaft without interfering with each support shaft.   The optical pickup device according to claim 1, wherein the drive chassis is a synthetic resin molded product, and each of the support shafts is formed by integral molding with the drive chassis.

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