JP2005038534A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device in which flawing of a flexible substrate can be prevented with a simple configuration. <P>SOLUTION: The optical pickup device 10 is provided with the flexible substrate 12 on a surface 15 facing the flexible substrate of a housing 13 provided with an optical pickup section 11, and a sliding contact prevention member 16 for preventing sliding contact on the surface 15 facing the flexible substrate of the housing. On the other hand, the flexible substrate is mounted at its one end 14 on the housing and is disposed as to be drawn around so as to face the surface 15 of the housing. The gap G between the surface 23 facing the housing of the flexible substrate and the surface 15 of the housing is surely maintained by disposition of the sliding contact prevention member. Since the scraping of the surface 23 of the flexible substrate by the surface 15 of the housing is averted, the flawing of the surface 23 of the flexible substrate is surely prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical pickup device that uses light to perform at least one of recording, reproducing, and erasing information on an optical recording medium or a magneto-optical recording medium.

  The optical pickup device includes an optical pickup unit that includes a light source that emits laser light and an optical member that focuses the laser light emitted from the light source onto an optical recording medium or a magneto-optical recording medium. The optical pickup unit receives reflected light reflected by an information recording surface of an optical recording medium or a magneto-optical recording medium (hereinafter sometimes referred to as an optical disk), and receives light for obtaining a reproduction signal and an operation control signal. It also has an element. Such an optical pickup unit is configured to be moved by a drive unit provided in the optical pickup device so that tracking, which is an operation of following a track formed on the optical disc, is possible.

  Therefore, the optical pickup device requires wiring for supplying electric power to the light source of the optical pickup unit and transmitting a signal detected by the light receiving element. However, since the optical pickup unit is configured to be movable as described above, the fixed wiring may be damaged by the stress applied with the movement of the optical pickup unit. Must be configured to follow. In addition, as the optical pickup device is downsized, the space allowed for the wiring may be narrowed, and the wiring for supplying power to the optical pickup unit is wired on a substrate made of a flexible material. A flexible substrate on which a pattern is printed is used (for example, see Patent Document 1).

  FIG. 4 is a diagram illustrating a state of wiring by the flexible substrate 2 with respect to the conventional optical pickup unit 1. The above-described light source, optical member and the like constituting the optical pickup unit 1 are accommodated in the housing 3. The flexible substrate 2 used to supply power to the optical pickup unit 1 has one end 4 mounted on the housing 3 and the other end 5 on the surface 7 opposite to the surface 6 facing the optical disk of the housing 3. For example, it is drawn around and connected to a connection terminal provided in the main body of the optical pickup device.

  For example, in a portable personal computer on which an optical pickup device is mounted, a so-called notebook personal computer, the thickness of the optical pickup device is further reduced in order to increase the convenience of carrying. Is encouraged. Therefore, the gap G formed by the opposite surface 7 of the housing 3 and the flexible substrate 2 tends to be further narrowed.

  Since the housing 3 that accommodates the optical pickup unit 1 moves in the radial direction of the optical disk during the tracking operation, the relative position between the opposite surface 7 of the housing 3 and the flexible substrate 2 changes with this movement. When this relative position changes, the gap G formed by the flexible substrate 2 and the opposite surface 7 of the housing 3 is narrow, so the surface of the flexible substrate 2 may be rubbed by the housing 3. The housing 3 is made of a metal such as an aluminum alloy. On the other hand, the flexible substrate 2 is a soft member in which a wiring pattern made of copper is printed on a resin film or the like, so that the surface of the flexible substrate 2 is scratched by the housing 3. As a result, the flexible substrate 2 may be damaged.

  Since the wiring pattern on the flexible substrate 2, particularly the flexible substrate 2 is damaged, the power supply to the optical pickup unit 1 is hindered, and the optical pickup unit 1 malfunctions. Therefore, it is desired to prevent the flexible substrate 2 from being damaged.

Japanese Patent Laid-Open No. 10-188297

  An object of the present invention is to provide an optical pickup device that can prevent a flexible substrate from being damaged with a simple configuration.

The present invention relates to an optical pickup device that performs at least one of recording, reproducing, and erasing information on an optical recording medium or a magneto-optical recording medium using light.
A light source that emits light, an optical member that focuses the light emitted from the light source on an optical recording medium or a magneto-optical recording medium, and a light-receiving element that receives reflected light reflected by the optical recording medium or the magneto-optical recording medium A housing provided with an optical pickup unit, and
Including one end portion attached to the housing and a flexible substrate provided so as to be routed around one side of the housing;
In the optical pickup device, a surface of the housing facing the flexible substrate is provided with a sliding contact preventing member that prevents the flexible substrate from slidingly contacting the surface of the housing facing the flexible substrate.

In the present invention, the sliding contact prevention member is
One or a plurality of protrusions are formed so as to protrude from the surface of the housing facing the flexible substrate.

In the present invention, the sliding contact prevention member is
The protruding shape is a hemisphere and is made of a resin adhesive.

Further, the present invention provides the housing and the sliding contact prevention member,
It is formed as an integral member.

In the present invention, the portion of the flexible substrate that contacts the sliding contact prevention member
A preliminary pattern, which is a wiring pattern that is not used for conductive connection, is formed.

  According to the present invention, the surface of the housing of the optical pickup device that faces the flexible substrate is provided with the sliding contact prevention member that prevents the flexible substrate from slidingly contacting the surface of the housing facing the flexible substrate. By providing the sliding contact prevention member in this way, when the housing in which the optical pickup unit is provided is moved by a tracking operation or the like, the flexible substrate does not slide with respect to the housing, but instead serves as a sliding contact prevention member. Since they slide against each other, they are prevented from being damaged by rubbing with the housing.

  Further, according to the present invention, one or a plurality of sliding contact prevention members are formed in a projection shape, preferably a resin adhesive, on a surface facing the flexible substrate of the housing. Thus, while suppressing the area of the portion of the sliding contact prevention member that comes into contact with the flexible substrate, it is possible to realize further prevention of damage to the flexible substrate that slides against the sliding contact prevention member by forming it with a soft material. it can.

  According to the present invention, since the housing and the sliding contact prevention member are formed as an integral member, the number of parts handled during assembly of the apparatus can be reduced and the production efficiency can be improved.

  Further, according to the present invention, the preliminary pattern, which is a wiring pattern that is not used for conductive connection, is formed on the portion of the flexible substrate that contacts the sliding contact prevention member. Even when the substrate is damaged, the damage is limited to the spare pattern portion, and power supply to the optical pickup unit is not hindered.

  FIG. 1 is a diagram illustrating a state of wiring by a flexible substrate 12 with respect to an optical pickup unit 11 provided in an optical pickup device 10 according to an embodiment of the present invention. The wiring state of FIG. 1A is a bottom view as viewed from the side opposite to the side where the optical disk is mounted on the optical pickup device 10, that is, the bottom surface side of the device, and FIG. 1B is a front view thereof. 1 (c) is a right side view thereof. The optical pickup device 10 of the present embodiment can perform at least one of information recording, reproduction, and erasing on an optical recording medium called an optical disk or a magneto-optical recording medium using light.

  The optical pickup device 10 includes a light source that emits light, an optical member that condenses the light emitted from the light source on an optical disc, and a light receiving element that receives reflected light reflected by the optical recording medium or the magneto-optical recording medium. A housing 13 in which the optical pickup unit 11 provided is provided, and a flexible substrate 12 in which one end portion 14 is mounted on the housing 13 and is drawn so as to face one surface 15 of the housing 13 are included. The surface 15 of the housing 13 facing the flexible substrate 12 is provided with a sliding contact prevention member 16 that prevents the flexible substrate 12 from slidingly contacting the surface 15 of the housing 13 facing the flexible substrate 12.

  The light source provided in the optical pickup unit 11 is, for example, a semiconductor laser that can emit laser light. The optical member also includes a collimator lens that collimates the laser light emitted from the light source, a rising mirror that reflects the laser light and bends the optical path, and an objective lens that focuses the laser light on the information recording surface of the optical disk. Composed. The light receiving element is a photoelectric conversion element made of, for example, a photodiode, and obtains an information reproduction signal, a tracking control signal, and a focusing control signal by detecting the above-described reflected light. In the present embodiment, the optical pickup unit 11 is provided so as to be accommodated in the housing 13. Therefore, detailed illustration of the optical pickup unit 11 is omitted.

  The housing 13 in which the optical pickup unit 11 is accommodated is made of, for example, an aluminum alloy. In the housing 13, a through hole 19 is formed in the vicinity of one end 17, and a groove 20 is formed in the other end 18. A shaft rod (not shown) is inserted into the through hole 19, and the shaft rod is fixed to the apparatus main body of the optical pickup device, and is further parallel to the extending direction of the shaft rod inserted into the through hole 19. One shaft rod is provided, and the other shaft rod is fixed to the apparatus main body so as to contact the groove 20. The through-hole 19 and the groove 20 and each shaft rod are slidable, and the housing 13 is in the direction in which the shaft rod extends by transmitting the driving force by the drive portion provided in the apparatus main body to the housing 13. It can be moved forward and backward in the direction of the arrow 21. As a result, the optical pickup unit 11 provided in the housing 13 can perform a tracking operation.

  The flexible substrate 12 is a conductive connection member having a wiring pattern in which a thin conductive layer made of copper (Cu), aluminum (Al), or the like is formed on a flexible resin film such as polyimide by photolithography or the like. . As described above, one end portion 14 of the flexible substrate 12 is attached to the housing 13, and the wiring pattern portion of the flexible substrate 12 is electrically connected to the light source and the light receiving element of the optical pickup portion 11. The other end 22 of the flexible substrate 12 passes through one surface 15 of the housing 13 and is connected to a connection terminal provided in the apparatus main body. The connection terminal is provided with wiring that leads to a power source, wiring that leads to a control means that controls the operation of the optical pickup unit 11 in response to a signal transmitted from the light receiving element, and the like.

  The sliding contact preventing member 16 of the present embodiment has a rectangular parallelepiped shape, and is formed on the surface 15 facing the flexible substrate 12 of the housing 13 in a direction orthogonal to the arrow 21 direction that is the moving direction of the housing 13. It is provided so that the longitudinal direction extends. For the sliding contact prevention member 16, an ultraviolet curable resin such as an acrylic resin is preferably used. The sliding contact prevention member 16 is formed on the surface 15 of the housing 13 by supplying the acrylic resin before curing as described above and then curing it with ultraviolet rays. Further, the sliding contact prevention member 16 may be formed by repeatedly performing a step of supplying an acrylic resin before curing and a step of ultraviolet curing.

  In the optical pickup device 10 configured as described above, when the housing 13 advances and retracts in the direction of the arrow 21 for tracking, the housing 13 also moves relative to the surface 23 of the flexible substrate 12 facing the housing 13. Since the sliding contact prevention member 16 is provided on the surface 15 of the housing 13 facing the flexible substrate 12, the gap G between the surface 23 of the flexible substrate 12 facing the housing 13 and the surface 15 of the housing 13 is sufficiently large. Thus, the surface 23 of the flexible substrate 12 does not slide against the surface 15 of the housing 13. That is, since the surface 23 of the flexible substrate 12 is not directly rubbed by the surface 15 of the housing 13 made of a hard material, the surface 23 of the flexible substrate 12 can be prevented from being damaged. Although the surface 23 of the flexible substrate 12 is in sliding contact with the sliding contact prevention member 16, the sliding contact prevention member 16 is made of, for example, acrylic resin and is softer than the housing 13. Even scratches and the like will not occur.

  FIG. 2 is a diagram illustrating a state of wiring by the flexible substrate 12 with respect to the optical pickup unit 11 provided in the optical pickup device 30 according to the second embodiment of the present invention. The optical pickup device 30 according to the present embodiment is similar to the optical pickup device 10 according to the first embodiment, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.

  It should be noted in the optical pickup device 30 that two sliding contact prevention members 31a and 31b are provided side by side in a direction orthogonal to the arrow 21 direction, and the sliding contact prevention members 31a and 31b are made of an ultraviolet curable acrylic resin. It is made of an adhesive and is formed in a hemispherical shape protruding from the surface 15 of the housing 13 facing the flexible substrate 12. The anti-sliding members 31a and 31b having such a shape are formed by dropping a pre-curing acrylic resin having a relatively high viscosity onto a predetermined position on the surface 15 of the housing 13 and using the surface tension thereof to form a hemispherical shape. Can be realized by irradiating with ultraviolet rays and curing.

  In such sliding contact preventing members 31a and 31b, not only the gap G is reliably held, but also the area of the flexible substrate 12 that contacts the surface 23 of the flexible substrate 12 facing the housing 13 is kept small. Since the portion that contacts the surface 23 is formed of a curved surface, the frictional force between the surface 23 of the flexible substrate 12 and the contact portions of the sliding contact preventing members 31a and 31b with respect to the flexible substrate 12 is further reduced. Therefore, the occurrence of scratches on the flexible substrate 12 is more reliably realized.

  In addition, such a sliding contact prevention member 31a, 31b is not limited to an ultraviolet curable resin, For example, a thermoplastic resin can also be used. Furthermore, you may shape | mold the housing 13 and the sliding contact prevention members 31a and 31b as an integral member using a thermoplastic resin. Such a molding in which the metal housing 13 and the thermoplastic resin sliding contact preventing members 31a and 31b are formed as an integral member can be realized by insert molding which can be simultaneously molded using different materials. Thus, by making the housing 13 and the sliding contact prevention members 31a and 31b as an integral member, it is possible to improve the efficiency of the production of the member itself, and the number of handling parts at the time of assembling the device is reduced. Production efficiency can be improved.

  FIG. 3 is a diagram showing a state of wiring by the flexible substrate 36 with respect to the optical pickup unit 11 provided in the optical pickup device 35 according to the third embodiment of the present invention. The optical pickup device 35 of the present embodiment is similar to the optical pickup device 30 of the second embodiment, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.

  It should be noted that in the optical pickup device 35, preliminary patterns 37a and 37b, which are wiring patterns that are not used for conductive connection, are formed on the portions of the flexible substrate 36 that contact the sliding contact preventing members 31a and 31b. It is.

  As described above, the flexible substrate 36 has the wiring pattern 39 in which a plurality of Cu conductive layers are formed on the resin film 38 by photolithography or the like. The flexible substrate 36 of the present embodiment further extends on the surface of the resin film 38 in a direction parallel to the moving direction of the housing 13 to form the preliminary patterns 37a and 37b. The material of the preliminary patterns 37a and 37b is not limited to the conductive material such as Cu of the wiring pattern 39 material, and is formed at the contact and sliding portions with the sliding contact preventing members 31a and 31b. Therefore, any material that can improve the abrasion resistance of the resin film 38 may be used.

  In the optical pickup device 35 configured in this way, even if the flexible substrate 36 is damaged due to rubbing of the sliding contact preventing members 31a and 31b, the preliminary pattern in which the damage is not used for the conductive connection. Since the wiring pattern 39 is kept healthy only in the portions 37a and 37b, the power supply to the optical pickup unit 11 and signal transmission are not hindered.

It is a figure which shows the state of the wiring by the flexible substrate 12 with respect to the optical pick-up part 11 with which the optical pick-up apparatus 10 which is one Embodiment of this invention is equipped. It is a figure which shows the state of the wiring by the flexible substrate 12 with respect to the optical pick-up part 11 with which the optical pick-up apparatus 30 which is the 2nd Embodiment of this invention is equipped. It is a figure which shows the state of the wiring by the flexible substrate 36 with respect to the optical pick-up part 11 with which the optical pick-up apparatus 35 which is 3rd Embodiment of this invention is equipped. It is a figure which shows the state of the wiring by the flexible substrate 2 with respect to the conventional optical pick-up part 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 30, 35 Optical pick-up apparatus 11 Optical pick-up part 12, 36 Flexible board 13 Housing 16, 31a, 31b Sliding contact prevention member 19 Through-hole 20 Groove 37 Preliminary pattern 38 Resin film 39 Wiring pattern

Claims (5)

In an optical pickup device that performs at least one of recording, reproducing, and erasing information on an optical recording medium or a magneto-optical recording medium using light,
A light source that emits light, an optical member that focuses the light emitted from the light source on an optical recording medium or a magneto-optical recording medium, and a light-receiving element that receives reflected light reflected by the optical recording medium or the magneto-optical recording medium A housing provided with an optical pickup unit, and
Including one end portion attached to the housing and a flexible substrate provided so as to be routed around one side of the housing;
An optical pickup device, wherein a surface of the housing facing the flexible substrate is provided with a sliding contact prevention member for preventing the flexible substrate from slidingly contacting the surface of the housing facing the flexible substrate. The sliding contact prevention member is
2. The optical pickup device according to claim 1, wherein one or a plurality of protrusions are formed so as to protrude from a surface of the housing facing the flexible substrate. The sliding contact prevention member is
3. The optical pickup device according to claim 2, wherein the protruding shape is a hemisphere and is made of a resin adhesive. The housing and the sliding contact prevention member,
The optical pickup device according to claim 1, wherein the optical pickup device is formed as an integral member. In the portion of the flexible substrate that contacts the sliding contact prevention member,
5. The optical pickup device according to claim 1, wherein a preliminary pattern which is a wiring pattern that is not used for conductive connection is formed.