JP2013246847A - Optical pickup device - Google Patents

Abstract

Provided is an optical pickup device capable of reducing the thickness of a device even when the integration rate of components increases and the thickness of the device increases because laser light traveling from a light source toward a condensing portion passes. Objective.
A laser unit that emits laser light, an objective lens that focuses the laser light on an optical disc, an optical component that is positioned between the laser unit and the objective lens, and that guides the laser light, and a laser unit 101, the objective lens 13, and a carriage 4 that holds optical components, a guide shaft 7 and a support shaft 6 that support the carriage 4 from both ends and hold them movably, and a wiring member 35 that is connected to the laser unit 101 and supplies power. The guide shaft 7 is positioned on the laser unit 101 side, the support shaft 6 is positioned on the objective lens 13 side, and the wiring member 35 is drawn from between the laser unit 101 and the guide shaft 7. To do.
[Selection] Figure 1

Description

  The present invention relates to an optical pickup device mounted on an electronic device such as a personal computer, a notebook computer, or a mobile terminal device.

  There are various types of optical disks such as BD, DVD, CD-R, and CD-RW. In the BD, information is recorded or reproduced by a laser beam having a wavelength of about 405 nm. In a DVD, information is recorded or reproduced by a laser beam having a wavelength of about 650 nm. On the other hand, in CD-R and CD-RW, information is recorded or reproduced by laser light having a wavelength of about 780 nm. An optical pickup device that records or reproduces information on a plurality of types of optical discs has been proposed.

  In recent years, optical disc apparatuses have been made thinner due to the thinning of notebook computers and mobile terminal devices.

JP 2006-4571 A

  In order to reduce the thickness of the optical pickup device, it is necessary to reduce the thickness of the optical component and the light receiving element.

  However, there is a limit to thinning optical components and light receiving elements, and there is a problem that it is difficult to further thin the optical pickup device.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical pickup device capable of reducing the thickness of the device.

  The present invention includes a light source that emits laser light, a condensing unit that condenses the laser light on an optical disc, an optical component that is positioned between the light source and the condensing unit, and that guides the laser light, and the light source A carriage that holds the light collecting unit and the optical component, a first shaft and a second shaft that support the carriage from both ends and hold it movably, and a wiring member that is connected to the light source and supplies power. The first shaft is located on the light source side, the second shaft is located on the light condensing part side, and the wiring member is drawn from between the light source and the first shaft. This is an optical pickup device.

  According to the present invention, since the wiring member is drawn out from between the light source and the first shaft, the space for arranging the wiring member above or below the light source, the condensing unit, and the optical component is not required. In addition, the wiring member can be arranged without affecting the optical path position of the laser light traveling from the light source toward the condensing unit. As a result, there is no need for a space for arranging the wiring member above or below the light source, the condensing unit, and the optical component without affecting the optical path position of the laser light from the light source toward the condensing unit. An optical pickup device that can be made thinner can be realized.

The top view which shows the optical pick-up apparatus in Embodiment 1 of this invention Side surface sectional view which shows the optical pick-up apparatus in Embodiment 1 of this invention The elements on larger scale which show the optical pick-up apparatus in Embodiment 1 of this invention The front view which shows the actuator of the optical pick-up apparatus in Embodiment 1 of this invention Sectional drawing which shows the actuator of the optical pick-up apparatus in Embodiment 1 of this invention The perspective view which shows the actuator of the optical pick-up apparatus in Embodiment 1 of this invention. The perspective view which shows the optical pick-up apparatus in Embodiment 1 of this invention. The figure which shows the structure of the optical pick-up module in Embodiment 1 of this invention.

  The invention described in claim 1 includes a light source that emits laser light, a condensing unit that condenses the laser light on an optical disc, an optical component that is positioned between the light source and the condensing unit, and that guides the laser light, and a light source. A carriage that holds the condensing unit and the optical component, a first shaft and a second shaft that support the carriage from both ends and hold the carriage movably, and a wiring member that is connected to the light source and supplies electric power. The shaft is located on the light source side, the second shaft is located on the light collecting part side, and the wiring member is drawn from between the light source and the first shaft. Thereby, since a wiring member is pulled out from between a light source and a 1st shaft, the space for arrange | positioning a wiring member above or below a light source, a condensing part, and an optical component is not required. In addition, the wiring member can be arranged without affecting the optical path position of the laser light traveling from the light source toward the condensing unit. As a result, there is no need for a space for arranging the wiring member above or below the light source, the condensing unit, and the optical component without affecting the optical path position of the laser light from the light source toward the condensing unit. An optical pickup device that can be made thinner can be realized.

  The invention according to claim 2 is characterized in that the wiring member is pulled out from the side of the carriage in parallel with the moving direction of the carriage. As a result, the wiring member is pulled out from the side of the carriage in parallel with the moving direction of the carriage, so that no load is applied to the wiring member when the carriage moves.

  The invention described in claim 3 is provided with a rotation driving means for rotating the optical disk, and the wiring member is drawn out in the direction of the rotation driving means. As a result, the wiring member is pulled out in the direction of the rotation driving means, so that the carriage moves without obstructing the movement of the carriage moving away from the center of the rotation driving means or in the direction approaching the center of the rotation driving means. At this time, no load is applied to the wiring member.

(Embodiment 1)
Hereinafter, an optical pickup device according to Embodiment 1 of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing an optical pickup device according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view of the optical pickup device according to Embodiment 1 of the present invention.

  Note that the light source, the condensing unit, the light receiving element, the carriage, and the rotation driving unit in the present embodiment correspond to the laser unit 101, the objective lens 13, the light receiving element unit 102, the carriage 4, and the spindle motor 2, respectively. In addition, the shaft in the present embodiment includes a support shaft 6 and a guide shaft 7, the first shaft corresponds to the guide shaft 7, and the second shaft corresponds to the support shaft 6.

  The optical pickup 3 irradiates the optical disc 1 with light to perform at least one of information reproduction and information recording. The optical disc 1 is classified into a disc that can only reproduce information, a disc that can record information in addition to reproducing information, and a disc that can record / erase information in addition to reproducing information. There are a CD-ROM disc, a DVD-ROM disc, a BD-ROM disc, and the like as a disc that can only reproduce information. Further, as a disc on which information can be recorded in addition to information reproduction, there are a CD-R disc, a DVD-R disc, a BD-R disc, and the like. In addition to information reproduction, there are CD-RW discs, DVD-RW discs, DVD-RAM discs, BD-RE discs, and the like that can record / erase information.

  The optical disk 1 includes a recording layer that can record and / or reproduce information with substantially blue-violet light, a recording layer that can record and / or reproduce information with substantially red light, Some have a recording layer capable of recording or reproducing information with infrared light. Further, the optical disc 1 has disk shapes having various diameters. Among these, a disk shape having a diameter of 3 cm to 12 cm is preferably used.

  The spindle motor 2 is a motor for rotating the optical disc 1. The spindle motor 2 is provided with a chucking portion (not shown) that holds the optical disc 1. The spindle motor 2 can rotate the optical disk 1 at a constant angular velocity or variably rotate the angular velocity. Whether the angular velocity is controlled in a constant or variable manner as described above is switched according to the situation by a spindle motor driving means and a control unit of the optical disc apparatus (not shown). In the present embodiment, the spindle motor 2 is used as the rotation driving means of the optical disc 1, but it may be rotated by using other types of motors or other means.

  The optical pickup 3 includes an objective lens 13 that condenses the laser beam 106 on the optical disc 1, and records information on the optical disc 1 and reads information from the optical disc 1 by irradiating the optical disc 1 with light.

  The carriage 4 is a base of the optical pickup 3, and holds the laser unit 101, the light receiving element unit 102, and a plurality of optical components that guide the laser beam 106 from the laser unit 101 to the objective lens 13. Here, the plurality of optical components includes a collimating lens 9 and a rising prism 12.

  The optical pickup actuator 5 moves the objective lens 13 approximately three-dimensionally. The carriage 4 is supported at both ends by a support shaft 6 and a guide shaft 7. The support shaft 6 is positioned on the objective lens 13 side to support one end of the carriage 4, the guide shaft 7 is positioned on the laser unit 101 side to support the other end of the carriage 4, and the carriage 4 is attached to the optical disc. 1 is movable between the inner periphery and the outer periphery. The carriage 4 is equipped with an optical pickup actuator 5 and an optical unit or a light source.

  The beam splitter 8 has a function of branching the incident laser beam 106, transmits a part of the laser beam 106 toward the optical monitor 31, and directs the remaining laser beam 106 to the rising prism. The optical monitor 31 monitors the output level of the laser beam 106 using the light guided via the beam splitter 8.

  The collimating lens 9 makes the diverged laser beam 106 output from the laser unit 101 substantially parallel.

  The optical unit 10 includes a laser unit 101 that emits red and infrared laser beams and a light receiving element unit 102 that receives the laser beams. Details will be described with reference to FIG.

  The wave plate 11 is a λ / 4 plate corresponding to a wavelength of approximately 660 nm and a wavelength of approximately 780 nm, and the polarization direction is polarized by approximately 90 degrees in the forward path and the return path.

  The rising prism 12 reflects the laser beam on the first surface 121, further reflects the second surface 122, and then transmits the first surface 121. As a result, at least one of the optical pickup device can be easily reduced in thickness and size, and the rigidity of the actuator described later can be increased.

  The objective lens 13 is an objective lens for an optical disc (DVD) 1 corresponding to a wavelength of about 660 nm, and can focus on a desired recording position with parallel light even on the optical disc (CD) 1 corresponding to a wavelength of about 780 nm. It has a function that can. In the present embodiment, the center of the objective lens 13 is substantially aligned with the center line M passing along the moving direction L of the carriage 4 and passing through the center of the spindle motor 2.

  The laser driver 30 has a function of emitting a laser diode having a wavelength of about 780 nm and a wavelength of about 660 nm built in the laser unit 101 and a function of superimposing each wavelength for noise reduction. Further, the laser driver 30 is disposed close to the wiring member cover sheet metal 34 (see FIG. 7) disposed on the carriage 4 and the cover sheet metal (not shown) disposed below the carriage 4 to effectively dissipate heat. It has a structure that can.

  Next, the outgoing path of laser light from the laser unit 101 toward the objective lens 13 will be described.

  Laser light 106 emitted from the laser unit 101 travels to the beam splitter 8 via the prism 105. In the beam splitter 8, a part of the laser beam 106 is directed to the optical monitor 31 and the rest is directed to the collimating lens 9. The optical monitor 31 receives part of the laser light 106 and controls the amount of laser light emitted from the laser unit 101. The rising prism 12 further directs the incident laser beam 106 toward the objective lens 13. The objective lens 13 focuses the incident laser beam 106 on the recording surface of the optical disc 1 to reproduce information or record information.

  Next, the return path of laser light from the objective lens 13 toward the light receiving element unit 102 will be described.

  A part of the light condensed on the recording surface of the optical disc 1 by the objective lens 13 is reflected to the objective lens 13 side. The reflected light is incident on the objective lens 13 and then reaches the light receiving element portion 102 via the rising prism 12, the collimating lens 9, the beam splitter 8, and the prism 105. The prism 105 is positioned on the optical path from the laser unit 101 to the objective lens 13 and is held by the carriage 4. The prism 105 has a function of directing the laser beam 106 from the laser unit 101 toward the objective lens 13, and return light from the objective lens 13. Has a function of directing the light toward the light receiving element portion 102. In the case of the return light from the objective lens 13, the return light from the objective lens 13 is made to reach the light receiving element unit 102 using the function of the prism 105.

  Next, the characteristic part of this Embodiment is demonstrated.

  The carriage 4 is supported at both ends by a support shaft 6 and a guide shaft 7 and is movable. The guide shaft 7 is located on the laser unit 101 side, and the support shaft 6 is located on the objective lens 13 side. The wiring member 35 is connected to at least the laser unit 101 and supplies power for causing the laser unit 101 to emit laser light. The wiring member 35 is drawn from between the laser unit 101 and the guide shaft 7.

  Thereby, since the wiring member 35 is pulled out from between the laser unit 101 and the guide shaft 7, a space for arranging the wiring member 35 above or below the laser unit 101, the objective lens 13, and the optical component is not required. In addition, the wiring member 35 can be disposed without affecting the optical path position of the laser light from the laser unit 101 toward the objective lens 13. As a result, a space is required for arranging the wiring member 35 above or below the laser unit 101, the objective lens 13, and the optical component without affecting the optical path position of the laser beam from the laser unit 101 toward the objective lens 13. Therefore, an optical pickup device capable of reducing the thickness of the device can be realized.

  The wiring member 35 is pulled out from the side of the carriage 4 in parallel with the movement direction of the carriage 4. As a result, the wiring member 35 is pulled out from the side of the carriage 4 in parallel with the moving direction of the carriage 4, so that no load is applied to the wiring member when the carriage 4 moves.

  Further, the wiring member 35 is pulled out in the direction of the spindle motor 2. As a result, the wiring member 35 is pulled out in the direction of the spindle motor 2, so that the carriage 4 moves without disturbing the movement of the carriage 4 moving away from the spindle motor 2 or in the direction approaching the spindle motor 2. In addition, no load is applied to the wiring member 35.

  FIG. 3 is a partially enlarged view showing the optical pickup device according to Embodiment 1 of the present invention.

  Note that the light receiving element and the prism in this embodiment correspond to the light receiving element portion 102 and the prism 105, respectively.

  The laser unit 101 includes a laser diode 103 that emits laser light having a wavelength of approximately 660 nm and a laser diode 104 that emits laser light having a wavelength of approximately 780 nm. The laser diodes 103 and 104 are attached to a base 101a. .

  In the present embodiment, the laser diodes 103 and 104 are arranged as separate light emitter blocks, but a configuration in which one light emitter block is arranged by providing a plurality of light emitting layers in one light emitter block may be used. In this embodiment, two different wavelength laser diodes are mounted. However, one or three or more different wavelength laser diodes may be provided.

  The base 101a is provided with a plurality of terminals 101b. The terminal 101b includes a ground terminal, a terminal for supplying current to the laser diodes 103 and 104, an output terminal for monitor light, and the like.

  In the present embodiment, a detailed description will be given below of a mode in which two laser diodes are mounted.

  The prism 105 transmits the laser beam 106 and guides the return light to the light receiving element unit 102. The prism 105 is provided with inclined surfaces 105a to 105c that are substantially parallel and inclined to each other, and optical elements such as a beam splitter film and a hologram are disposed on the inclined surfaces 105a to 105c. Specifically, the inclined surface 105a is provided with a reflection film and a hologram (not shown), and has functions for focus detection, tracking detection, detection of signals and control signals recorded on the optical disc 1, and the like. It has been incorporated. On the inclined surface 105b, a film that transmits P-wave light and reflects S-wave light with a polarization beam splitter is formed for a wavelength of approximately 660 nm, and a film that partially transmits and partially reflects for a wavelength of approximately 780 nm. Is formed. On the inclined surface 105c, a film that transmits only the P-wave light and reflects the S-wave light with a polarization beam splitter with respect to the wavelength of about 660 nm and the wavelength of about 780 nm is formed.

  The inclined surfaces 105a to 105c correspond to joint surfaces such as transparent glass blocks and resin blocks. In the present embodiment, three inclined surfaces are provided, but one or more inclined surfaces may be provided.

  Further, if necessary, a diffraction grating 108 for forming three beams is formed from one plate on the laser unit 101 side of the prism 105. A single diffraction grating for the entire wavelength of about 780 nm is formed. And a three-beam diffraction grating formed of a diffraction grating divided into two with respect to a wavelength of about 660 nm. In this embodiment, the diffraction grating is formed from one plate. However, for example, a plurality of plates using polarized light are pasted so that one laser wavelength is not influenced by the other wavelength. A diffraction grating may be used.

  The coupling member 107 is a member for determining the positions of the laser unit 101 and the light receiving element unit 102.

  Light emitted from one of the laser diodes 103 and 104 passes through the diffraction grating 108 and the prism 105 and is guided to the optical disc 1, and the reflected light reflected by the optical disc 1 passes through the prism 105 and receives the light receiving element portion. 102. At this time, the reflected light from the optical disk 1 at the prism 105 is reflected between the inclined surface 105 b and the inclined surface 105 a and is incident on the light receiving element portion 102.

  The light receiving element portion 102 has a light receiving element 102a covered with a case 102b including a transparent member, and a terminal (not shown) electrically connected to the light receiving element 102a is led out of the case 102b. .

  The optical monitor 31 has a light receiving element 31a covered with a case 31b including a transparent member, and a terminal (not shown) electrically connected to the light receiving element 31a is led out of the case 31b.

  Next, the actuator holding the objective lens will be described with reference to FIGS.

  4 is a front view showing the actuator of the optical pickup device according to the first embodiment of the present invention, FIG. 5 is a cross-sectional view showing the actuator of the optical pickup device according to the first embodiment of the present invention, and FIG. FIG. 11 is a perspective view showing an actuator of the optical pickup device in Mode 1.

  4, 5, and 6, the objective lens holding cylinder 14 fixes the objective lens 13 by means such as adhesion.

  The focus coils 19 and 20 are each wound in a substantially ring shape. The tracking coils 15, 16, 17, and 18 are each wound in a substantially ring shape, like the focus coils 19 and 20. These focus coils 19, 20 and tracking coils 15, 16, 17, 18 are also fixed to the objective lens holding cylinder 14 with an adhesive or the like. The suspension wires 21 and 22 connect the objective lens holding cylinder 14 and the suspension holder 23, and at least the objective lens holding cylinder 14 can be displaced with respect to the suspension holder 23 within a predetermined range. Both end portions of the suspension wires 21 and 22 are fixed to the objective lens holding cylinder 14 and the suspension holder 23 by soldering, welding, adhesion, or the like, respectively. The focus coil 19 and the tracking coil 15 are also fixed to the suspension wire 21 by soldering, and the focus coil 20 and the tracking coil 18 are also electrically connected to the suspension wire 22 by soldering. The suspension wires 21 and 22 are preferably six or more round wires or plates so that electric power can be supplied to each of the focus coils 19 and 20 and to the tracking coils 15, 16, 17 and 18 joined in series. It consists of a spring or the like. In the present embodiment, three suspension wires 21 and 22 are arranged in a staggered manner, and at least one of thinning and miniaturization of the optical pickup device can be performed.

  In order to fix the suspension wires 21 and 22 to the suspension holder 23 with solder or the like, a flexible substrate 24 is fixed by bonding or the like. The magnets 25, 26, 27, and 28 are focus and tracking magnets, and are configured to have a smaller magnet width direction (tracking direction) than the focus coils 19 and 20. The coil center positions of the focus coils 19 and 20 are arranged at the center positions of the magnets 25, 26, 27 and 28. The tracking coil 15 is disposed near the inner periphery of the optical disc 1 with respect to the magnet 25, the tracking coil 16 is disposed near the outer periphery of the optical disc 1 with respect to the magnet 26, and the tracking coil 17 is disposed within the optical disc 1 with respect to the magnet 27. The tracking coil 18 is arranged near the outer periphery of the optical disc 1 with respect to the magnet 28. The magnets 25, 26, 27, and 28 have magnetic poles divided in a direction orthogonal to the tracking direction. That is, one pole is disposed so as to face the substantially ring-shaped piece of the focus coils 19, 20 and the tracking coils 15, 16, 17, 18. At this time, the magnets 25, 26, 27, and 28 and the magnetic yoke 29 constitute a focus magnetic circuit and a tracking magnetic circuit, respectively, and the focus coils 19 and 20 and the tracking magnetic circuit respectively track in the focus magnetic circuit. A configuration in which one coil 15, 16, 17, 18 is provided can be realized, and each coil can be controlled independently by energizing each coil.

  In the present embodiment, the focus coils 19 and 20 are controlled independently. However, the focus coils 19 and 20 and the tracking coils 15, 16, 17, and 18 are all controlled independently. Also good. In this case, at least 12 suspension wires 21 and 22 are required as a whole.

  The magnetic yoke 29 functions as a magnetic yoke of the magnets 25, 26, 27, and 28 from the magnetic surface, and has a function of holding and fixing the suspension holder 23 from the structural surface. It is also used to fix the suspension holder 23 with an adhesive or the like. The suspension wires 21 and 22 are filled with a damper gel for damping on the suspension holder 23 side. The damper gel uses a material that becomes a gel by UV or the like. A portion constituted by the objective lens holding cylinder 14, the focus coil 19, the focus coil 20, the tracking coil 15, the tracking coil 16, the tracking coil 17, the tracking coil 18, and the objective lens 13 is referred to as an optical pickup actuator movable portion.

  Next, the optical configuration of the optical pickup device according to the present embodiment will be described with reference to FIGS.

  First, the wavelength of about 660 nm will be described.

  A laser beam 106 having a wavelength of about 660 nm emitted from the laser diode 103 of the laser unit 101 forms three beams by the diffraction grating 108, is reflected by the beam splitter 8 through the prism 105, and is made into a substantially parallel beam by the collimator lens 9. It is supposed to be. The substantially parallel laser beam 106 emitted from the collimating lens 9 is transmitted through the wave plate 11 to become substantially circularly polarized light, and is reflected by the first surface and the second surface 122 of the rising prism 12. The reflected laser beam 106 is condensed by the objective lens 13 to form a light spot on the optical disc 1.

  The laser beam 106 returning from the optical disk 1 is incident on the wave plate 11 from the direction opposite to the forward path and passes through the wave plate 11, so that the laser beam 106 is polarized in a polarization direction of about 90 degrees from the forward path. The light is reflected by 105 b, further reflected by the inclined surface 105 a, further reflected by the inclined surface 105 b, and guided to the light receiving element 102 a in the light receiving element unit 102. Further, the laser beam 106 emitted from the laser diode 103 is partially transmitted by the beam splitter 8 and guided to the optical monitor 31. The optical monitor 31 monitors the amount of the received laser beam 106 and adjusts the output level of the laser beam 106 emitted from the laser diode 103.

  Subsequently, the wavelength of about 780 nm will be described.

  A laser beam 106 having a wavelength of about 780 nm emitted from the laser diode 104 of the laser unit 101 forms three beams by the diffraction grating 108, is reflected by the beam splitter 8 through the prism 105, and is made into a substantially parallel beam by the collimator lens 9. It is supposed to be. The substantially parallel laser beam 106 emitted from the collimating lens 9 is transmitted through the wave plate 11 and becomes substantially circularly polarized light, and is reflected by the first surface and the second surface 122 of the rising prism 12. The reflected laser beam 106 is condensed by the objective lens 13 to form a light spot on the optical disc 1. The laser beam 106 returning from the optical disk 1 is incident on the wave plate 11 from the direction opposite to the forward path and passes through the wave plate 11, so that the laser beam 106 is polarized in a polarization direction of about 90 degrees from the forward path. The light is reflected by 105 b, further reflected by the inclined surface 105 a, further reflected by the inclined surface 105 b, and guided to the light receiving element 102 a in the light receiving element unit 102. The laser beam 106 emitted from the laser diode 104 is partially transmitted by the beam splitter 8 and guided to the optical monitor 31. The optical monitor 31 monitors the amount of received laser light 106 and adjusts the output level of the laser light 106 emitted from the laser diode 104.

  Next, the operation of the optical pickup actuator movable portion in the present embodiment will be described with reference to FIGS.

  Power is supplied from a power source (not shown) to the focus coils 19, 20 and the tracking coils 15, 16, 17, 18 through a flexible substrate 24 attached to the suspension holder 23 and suspension wires 21 and 22 connected to the flexible substrate 24. Is supplied. At least six suspension wires 21 and 22 are provided in total, two of which are connected to the tracking coils 15, 16, 17, and 18 provided in series, and two of the remaining four are the focus. Connected to the coil 19 and the remaining two are connected to the focus coil 20. As a result, the focus coils 19 and 20 can be energized independently of each other.

  When current flows in both the focus coil 19 and the focus coil 20 in the positive direction (or negative direction), the focus direction is determined from the positional relationship between the focus coils 19 and 20 and the magnets 25, 26, 27, and 28 and the polarity of the magnetic poles. A focus magnetic circuit that can be moved is formed, and the focus direction can be controlled in accordance with the direction and amount of current flow. Next, when a current is passed in the positive direction (or negative direction) of the tracking coils 15, 16, 17, 18, the positional relationship between the tracking coils 15, 16, 17, 18 and the magnets 25, 26, 27, 28, and the magnetic poles Therefore, a tracking magnetic circuit that can be moved in the tracking direction is formed based on the relationship of the polarities, and the tracking direction can be controlled.

  In the embodiment, as described above, the current can flow independently through the focus coil 19 and the focus coil 20. Therefore, when the direction of the current flowing through one coil is reversed, a force in the direction approaching the optical disc 1 acts on the focus coil 19, and a force acts on the focus coil 20 in a direction away from the optical disc 1. As a result, due to the conflicting forces, a moment that rotates in the tracking direction is generated in the optical pickup actuator movable portion, and it is possible to tilt to a position where the forces with the torsional moments acting on the six suspension wires 21 and 22 are balanced. The tilt direction can be controlled in accordance with the direction and amount of flow through the focus coil 19 and the focus coil 20.

  Hereinafter, the objective lens 13 will be described.

  The objective lens 13 preferably has a numerical aperture of 0.65 to 0.66 and a focal length of 1.5 mm to 1.65 mm at a wavelength of about 660 nm. That is, if the numerical aperture is other than 0.65 to 0.66, it is disadvantageous for the information recording / reproducing characteristics of the optical disc 1 (DVD), and if the focal length is short, the characteristics of the optical pickup 3 are reduced due to the eccentricity of the optical disc 1. Disadvantageously, if the focal length is long, the diameter size of the objective lens 13 becomes large. In addition, it is necessary to increase the diameter of the substantially parallel light incident on the objective lens 13, and accordingly, it is necessary to increase the size of the rising prism 12, the collimating lens 9, and the like. In this way, by defining the focal length of the objective lens 13, it is possible to realize at least one of thinning and miniaturization of the optical pickup device.

  Further, as shown in FIG. 1, it is preferable that the center of the objective lens 13 is substantially aligned with the center line M passing through the center of the spindle motor 2 along the moving direction L of the carriage 4. That is, with such a configuration, it is possible to employ a 3-beam DPP (differential push-pull) system that has the most proven record in the conventional light detection system.

  Next, the relationship between the optical pickup and the protective cover will be described. The protective cover 33 has an opening 331 that covers the carriage 4, the support shaft 6, and the guide shaft 7 and faces the optical disc 1.

  FIG. 7 is a perspective view showing the optical pickup device according to Embodiment 1 of the present invention. FIG. 8 is a diagram showing the configuration of the optical pickup module according to Embodiment 1 of the present invention. Note that the wiring member in the present embodiment corresponds to the wiring member 35.

  The upper surface of the optical pickup 3 is covered with a wiring member cover metal plate 34 and an actuator cover 36, and the actuator cover 36 includes an opening 36a through which at least the objective lens 13 is exposed. In addition, the wiring member cover sheet metal 34 includes a first flat portion 341 and a second flat portion 342.

  The wiring member 35 is connected to the laser unit 101, the light receiving element unit 102, and the optical monitor 31. The wiring member 35 may be connected by one wiring member or a plurality of wiring members. The wiring member 35 may be a flexible printed circuit board (FPC) or a flat cable in which lead wires are bundled.

  The optical pickup module 32 includes a protective cover 33, a spindle motor 2, and an optical pickup 3, and adopts a configuration in which the optical pickup 3 is moved closer to or away from the spindle motor 2 in the direction of the arrow in FIG.

  The wiring member 35 is pulled out from the lower surface side of the second flat portion 342 and connected to the optical disc apparatus. In the present embodiment, the wiring member 35 is pulled out from between the laser unit 101 and the guide shaft 7.

  The first flat portion 341 is disposed at the opening portion 331, and the second flat portion 342 is disposed below the protective cover 33. Further, since the first flat portion 341 is disposed in the opening portion 331, the first flat portion 341 can be brought closer to the optical disc 1 surface side than the second flat portion 342, and is almost the same height as the protective cover 33 or slightly protected. The cover 33 is disposed so as to protrude from the upper surface of the cover 33 so as not to contact the lower surface of the optical disc 1.

  On the lower surface of the first flat part 341, the laser part 101, the light receiving element part 102, and the optical monitor 31 are arranged. In the opening 331, a laser unit 101, a light receiving element unit 102, an optical monitor 31, a beam splitter 8, a collimator lens 9, a wavelength plate 11, a rising prism 12, and an objective lens 13 are arranged.

  In this embodiment, the laser unit 101, the light receiving element unit 102, and the optical monitor 31 are arranged on the lower surface of the first flat part 341. However, the laser unit 101 and the light receiving element part 102 are arranged on the first flat part 341. The structure arrange | positioned on the lower surface may be sufficient. In this embodiment, the laser part 101, the light receiving element part 102, the light monitor 31, the beam splitter 8, the collimator lens 9, the wave plate 11, the rising prism 12, and the objective lens 13 are arranged in the opening part 331. The laser unit 101, the light receiving element unit 102, the beam splitter 8, the collimator lens 9, the rising prism 12, and the objective lens 13 may be arranged.

  By adopting such a configuration, the laser unit 101, the light receiving element unit 102, the optical monitor 31, the beam splitter 8, the collimator lens 9, the rising prism 12, and the objective lens 13 can be reduced in thickness and size, respectively. The optical pickup 3 can be reduced in thickness and size.

  Further, by mounting the above-described optical pickup module 32 on an optical disk apparatus provided with an optical disk rotation driving means for rotating the optical disk 1, it is possible to realize an optical disk apparatus that can be reduced in thickness and size.

  Since the device can be thinned, the present invention can be applied to an optical pickup device mounted on an electronic device such as a personal computer, a notebook computer, or a mobile terminal device.

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3 Optical pick-up 4 Carriage 5 Optical pick-up actuator 6 Support shaft 7 Guide shaft 8 Beam splitter 9 Collimating lens 10 Optical unit 11 Wave plate 12 Rising prism 13 Objective lens 14 Objective lens holding cylinder 15, 16, 17, 18 Tracking coil 19, 20 Focus coil 21, 22 Suspension wire 23 Suspension holder 24 Flexible substrate 25, 26, 27, 28 Magnet 29 Magnetic yoke 30 Laser driver 31 Optical monitor 32 Optical pickup module 33 Protective cover 34 Wiring member cover sheet metal 35 Wiring Member 36 Actuator cover 36a Opening 101 Laser part 102 Light receiving element part 103 Laser diode 104 Over Heather diode 105 prism 106 laser beam 107 coupling member 108 the diffraction grating 331 opening

Claims (3)

A light source that emits laser light;
A condensing unit for condensing the laser light on an optical disc;
An optical component that is positioned between the light source and the condensing unit and guides the laser light;
A carriage for holding the light source, the condensing unit, and the optical component;
A first shaft and a second shaft that support the carriage from both ends and hold it movably;
A wiring member connected to the light source and supplying electric power,
The first shaft is located on the light source side, the second shaft is located on the light collecting unit side,
The optical pick-up apparatus, wherein the wiring member is pulled out from between the light source and the first shaft.   2. The optical pickup device according to claim 1, wherein the wiring member is pulled out from a side of the carriage in parallel with a moving direction of the carriage. Rotation drive means for rotating the optical disc,
3. The optical pickup device according to claim 2, wherein the wiring member is pulled out toward the rotation driving means.