JP4232696B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disk device mounted on an electronic device such as a personal computer, a notebook computer, or a mobile terminal device, and an optical pickup suitably used for the optical disk device.

  Various optical discs such as a DVD (Digital Versatile Disc), a CD-R (writable compact disc), and a CD-RW (rewritable compact disc) have been developed as optical recording media. 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 disc apparatus that records or reproduces information on a plurality of types of optical discs has been proposed.

  Further, in such an optical disc apparatus that records or reproduces information on a plurality of types of optical discs, a single laser element that emits light beams of different wavelengths is used as a light source of an optical pickup mounted on the optical disc apparatus. A so-called hybrid type two-wavelength semiconductor laser arranged adjacent to a package is described in (Patent Document 1), and a light source having a plurality of wavelengths is integrated on a single semiconductor substrate (so-called monolithic type). A two-wavelength semiconductor laser) is used.

  Furthermore, when recording on an optical disk, a high-output light source, an IC for driving the light source, and the like are required. As a result, the heat generation of the light source and the light source driving IC may be excessive and affect the recording / reproducing characteristics. In particular, the heat capacity has been reduced as the optical disk apparatus is made thinner and smaller, and this problem is particularly noticeable in a thin optical disk apparatus in which the thickness of the central portion of the housing is 14 mm or less, further 10 mm or less. It becomes.

  FIG. 8 is a diagram showing how the relationship between the current flowing through the laser light source and the light emission intensity of the laser light source changes as the environmental temperature changes. At room temperature, the threshold value, which is the minimum current value required for light emission, is low and the slope of the light emission intensity with respect to the amount of increase in current is steep. On the other hand, as the ambient temperature increases, the threshold value increases. The slope of the light emission intensity with respect to the increase amount of becomes small. Therefore, when the environmental temperature increases, the required light emission intensity cannot be obtained even if a predetermined current is supplied to the laser light source, and a larger current is supplied. This causes a vicious cycle in which the ambient temperature further increases due to this current, leading to a situation in which the recording / reproducing characteristics are not guaranteed.

Therefore, in order to optimize the recording / reproducing characteristics, how to suppress the heat generation of the optical pickup is an important issue. For this reason, for example, a technique aimed at improving the heat dissipation of the optical pickup (Patent Document 1), (Patent Document 2).
JP 2001-167462 A JP 2003-132570 A

However, these devices do not particularly recognize heat dissipation in a thin optical disk device, and a thin optical disk device having a small heat capacity does not have sufficient heat dissipation. Further, as the recording speed is increased, the energy to be recorded on a medium such as an optical disk also increases, and heat generation accompanying an increase in output of a laser unit equipped with a laser light source is a problem.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical disc apparatus capable of providing a sufficient heat dissipation effect even in a thin optical disc apparatus.

An optical disc apparatus according to the present invention is made to solve the above-described problem. The optical disc device is configured by a monoblock on one surface of a plate, and emits a plurality of light beams, and receives light reflected from the optical disc. A light receiving element, a wiring member connected to at least one of the light emitting element or the light receiving element, a carriage for mounting the light emitting element, the light receiving element and the wiring member, and a protective cover for covering the carriage, The protective cover has an opening, at least one of the light emitting element or the light receiving element is disposed in the opening , the wiring member is fixed by the carriage and the wiring member cover, and the wiring member cover is A first flat portion that covers an upper surface portion of at least one of the light emitting element or the light receiving element and is disposed below the protective cover; And a second flat portion disposed in the mouth portion, an upper surface of the second flat section takes the optical disk apparatus configuration, characterized in that arranged above the lower surface of the protective cover.

According to this configuration, the heat generated by the light emission of the laser light source provided in the light emitting element is transmitted to the carriage having a large heat capacity, and the heat of the light emitting element and the light receiving element can be radiated by the air flow accompanying the rotation of the disk. Further, the heat generated by the light emission of the laser light source provided in the light emitting element can be further transmitted to the wiring member cover, and the heat dissipation effect is further enhanced. Further, since the upper surface of the second flat portion is disposed above the lower surface of the protective cover, the heat of the wiring member cover can be radiated by the air flow caused by the disk rotation. Therefore, it is possible to maintain the environmental temperature of the laser unit at a predetermined temperature, to prevent the occurrence of a situation in which a desired light emission intensity cannot be obtained due to an increase in the environmental temperature, and to realize an optical disc apparatus with excellent recording and reproduction quality. Can do.

  According to the present invention, it is possible to maintain an optical temperature of the laser unit with excellent recording and reproduction quality by preventing the occurrence of a situation in which a desired light emission intensity cannot be obtained due to an increase in the environmental temperature. Can be realized.

The invention of claim 1 is constituted by a monoblock on one surface of the plate, and a light emitting element that emits a plurality of light beams, a light receiving element that receives light reflected from an optical disk, and the light emitting element or the light receiving element. A wiring member connected to at least one of the light emitting element, a carriage to which the light receiving element, the light receiving element, and the wiring member are attached; and a protective cover that covers the carriage, wherein the protective cover has an opening, and At least one of an element or the light receiving element is disposed in the opening , the wiring member is fixed by the carriage and a wiring member cover, and the wiring member cover is an upper surface of at least one of the light emitting element or the light receiving element. A first flat portion disposed below the protective cover and a second flat portion disposed in the opening, and the second flat portion The upper surface of the tongue portion is an optical disk apparatus configuration, characterized in that arranged above the lower surface of the protective cover.

According to this configuration, the heat generated by the light emission of the laser light source provided in the light emitting element is transmitted to the carriage having a large heat capacity, and the heat of the light emitting element and the light receiving element can be radiated by the air flow accompanying the rotation of the disk. Further, the heat generated by the light emission of the laser light source provided in the light emitting element can be further transmitted to the wiring member cover, and the heat dissipation effect is further enhanced. Further, since the upper surface of the second flat portion is disposed above the lower surface of the protective cover, the heat of the wiring member cover can be radiated by the air flow caused by the disk rotation. Therefore, it is possible to maintain the environmental temperature of the laser unit at a predetermined temperature, to prevent the occurrence of a situation in which a desired light emission intensity cannot be obtained due to an increase in the environmental temperature, and to realize an optical disc apparatus with excellent recording and reproduction quality. Can do.

A second aspect of the present invention, in the optical disk apparatus of the invention of claim 1, the area of the second flat portion is configured to have a 20mm ² ~400mm ^2.

According to this configuration, by bringing the wiring member cover closer to the disk surface, the heat of the wiring member cover can be radiated by the air flow caused by the disk rotation. In addition, the optical pickup unit has a sufficient heat dissipation effect and can be downsized.

  Embodiments of an optical pickup according to the present invention and an optical disc apparatus using the optical pickup will be described below.

(Embodiment 1)
FIG. 1 shows an optical disk apparatus using an optical pickup according to an embodiment of the present invention.

  In FIG. 1, reference numeral 2 denotes a housing, and the housing 2 is configured by combining an upper housing portion 2a and a lower housing portion 2b. The upper casing 2a and the lower casing 2b are fixed to each other using a spiral or the like. As the constituent material of the housing 2, a conductive material such as a metal material such as iron, iron alloy, aluminum, aluminum alloy, and magnesium alloy is preferably used. In addition, a structure in which each casing is made of a resin material and a highly conductive metal film is formed thereon using a technique such as electrodeposition may be used. Furthermore, each of the housing part 2a and the housing part 2b may be made of the same kind of material, or may be made of different materials. In addition, the average thickness of the main plane portion of each of the housing portion 2a and the housing portion 2b is between 0.3 mm and 1.6 mm, and when the average thickness is relatively thin, the housing portion 2a and the housing portion. The body part 2b is made of a metal material, and is formed, for example, by pressing a metal plate. Further, when the average thickness is relatively large, the casing 2a and the casing 2b are made of die casting (aluminum, magnesium alloy, etc.).

Reference numeral 3 denotes a tray that can be moved in and out of the housing 2, 5 is a spindle motor provided in the tray 3, 4 is an optical pickup module, 6 is a cover, and 7 is an optical pickup unit. The optical pickup unit 7 performs at least one of an operation of writing information on or reading information from the optical disc 106 (see FIG. 5). The optical pickup unit 7 is mounted on a carriage 11 that is held so as to be movable in the radial direction of the optical disk 106 (see FIG. 5). Reference numeral 8 denotes a bezel provided on the front end surface of the tray 3, and the bezel 8 is configured to close the entrance and exit of the tray 3 when the tray 3 is stored in the housing 2.

  Reference numerals 3a and 3b denote rails that are slidably attached to both the tray 3 and the casing 2, respectively. The rails 3a and 3b are provided on both sides of the tray 3, and the rails 3a and 3b are used for the casing. The tray 3 is attached so that it can be raised and lowered freely.

  FIG. 2 shows an optical pickup module 4 according to the embodiment of the present invention. The optical pickup module 4 includes a cover 6, a spindle motor 5, and an optical pickup unit 7. The optical pickup unit 7 moves the portion of the opening 6a in the direction of the arrow in FIG. It has a structure that can move away from the motor. The width of the opening 6a is set to 20 mm to 30 mm, and a part of the wiring member cover 31 of the optical pickup unit 7 disposed in the portion inside the opening 6a is such that the upper surface of the wiring member cover 31 is closer to the optical disk 106 than the lower surface of the cover 6. It is arranged on the surface side. The upper surface of the wiring member cover 31 only needs to be above the lower surface of the cover 6, that is, on the optical disk surface side, and may be the same as the upper surface position of the cover 6 or slightly protrudes from the upper surface of the cover 6 and does not contact the optical disk surface. It may be arranged in a range.

  As shown in FIG. 5, the optical disk 106 is mounted on the upper surface of the cover 6 and rotates. However, an air flow generated by the rotation of the optical disk 106 flows into the opening 6a, and the optical pickup unit is cooled by the air flow. The opening 6 a is disposed at the front end of the tray 3 with respect to the rotating means of the optical disk 106, for example, the spindle motor 5.

  FIG. 6 is a diagram showing an optical system configuration of the optical pickup according to the embodiment of the present invention. FIG. 7A shows a configuration diagram of the optical pickup according to the embodiment of the present invention, and FIG. 7B shows an optical pickup unit 7 formed by incorporating them.

  In the light source 201, a CD semiconductor laser emitting a laser beam having a wavelength of about 780 nm and a DVD semiconductor laser emitting a laser beam having a wavelength of about 650 nm are accommodated in a monoblock. In FIG. 6, the optical path of the laser beam for CD is indicated by a broken line, and the optical path of the laser beam for DVD is indicated by a solid line. The optical members 204 and 205 shown in FIG. 6 are fixed in the coupling base 203 shown in FIG.

  The light emitted from the light source 201 passes through the optical members 204 and 205, enters the collimator lens 100, is reflected by the beam splitter plate 101 (BS plate), and is guided to the rising prism 103. At this time, a part of the emitted light is transmitted through the BS plate 101 and guided to the light receiving sensor 102 that monitors the light amount of the light source 201, and the light emission power of the light source 201 is adjusted by the output of the light receiving sensor 102.

  The light from the beam splitter plate 101 is reflected by the surface 103a of the rising prism 103, is further reflected by the surface 103b, passes through the surface 103a, enters the hologram 104 sandwiching the liquid crystal, and is guided to the objective lens 105. It is condensed on the optical disk 106. The light reflected by the optical disk 106 is guided to the rising prism 103 via the objective lens 105 and the hologram, passes through the surface 103a, is reflected by the surface 103b, and is then reflected by the surface 103a and is guided to the beam splitter plate 101, The light is reflected by the beam splitter plate 101, passes through the collimator lens 100, enters the optical member 205, and reaches the light receiving element 202.

  An optical film having a wavelength-dependent transmission characteristic is formed on the beam splitter plate 101, and the CD laser light and the DVD laser light are transmitted through the optical film, and are received by the light receiving sensor 102. The intensity of the laser beam is adjusted.

  The light source 201 is attached to a carriage having a large heat capacity and has a structure for radiating the heat of the semiconductor laser.

  As shown in FIG. 3, the upper portion of the optical pickup unit 7 is covered with a wiring member cover 31 and an actuator cover 32, and the actuator cover 32 has an opening 34 through which the actuator 33 is exposed.

  The wiring member cover 31 serves to fix the wiring member 36 in the optical pickup unit, and includes at least two flat portions, a first flat portion 31a, and a second flat portion 31b.

  The wiring member 36 is connected to the light source 201 and the light receiving element 202 and may be connected by one wiring member 36 or a plurality of wiring members 36.

  The wiring member may be a flexible printed circuit board (FPC) or a flat cable in which lead wires are bundled.

  The first flat portion 31a is disposed below the cover 6 of the optical pickup module 4, and the second flat portion 31b is disposed in the opening 6a.

  The wiring member cover 31 is fitted or fixed to the carriage 11 at least at three points.

  FIG. 4 shows the wiring member cover 31. As shown in FIG. 4, the second flat portion 31b is higher than the first flat portion 31a.

The second flat part 31b is an approximately 20 mm ² ～400Mm ² area, spacing of the disc surface and the second flat portion 31b is a 1 mm to 3 mm. If the area is smaller than 20 mm ^2, the effect of setting the second flat portion 31 b to be high is small. If the area is larger than 400 mm ² , the wiring member cover 31 becomes large, and it is difficult to reduce the size of the optical pickup unit 7.

  The wiring member cover 31 is fitted or fixed to the carriage 11 at least at three points with the wiring member 36 sandwiched between the carriage 11. Fixing is done with screws or with an adhesive.

  As shown in FIG. 6, the light receiving element 202 receives both the laser light of the CD laser light and the DVD laser light. As shown in FIG. 7, the light receiving element 202 is attached to the coupling base 203 together with the light source 201 and fixed to the carriage 11. The light source 201 and the light receiving element 202 are arranged in the cover part of the optical pickup module 4 and are configured to be able to dissipate heat by the air flow accompanying the rotation of the optical disk 106.

  In the optical disc apparatus 1 having a thickness of about 13 mm or less and a thickness of about 10 mm or less in the central portion of the casing, the heat capacity of the carriage 11 is also reduced. Therefore, for the heat radiation of the light source 201 and the light receiving element 202, the air flow accompanying the rotation of the optical disk 106 cools the light source 201 and the light receiving element 202, and the air flows into the optical disk device from the opening 6a. Can be cooled. Further, the heat of the light source 201 can be transmitted to both the carriage 11 and the wiring member cover 31 to be dissipated.

Further, in the thin optical disc apparatus 1 having a thickness of 10 mm or less, when the optical pickup unit 7 is thinned, a light source 201 or a light receiving element 202 is disposed in the opening 6a, so that light beams having a plurality of wavelengths can be obtained. The optical disk device 1 can be made thinner without reducing the size of the light source 201 and the light receiving element 202 that emit light, and the heat generated by the light source 201 can be cooled.

  In the embodiment, the example in which the light source 201 or the light receiving element 202 is disposed in the opening 6a has been described. However, the embodiment is not limited to the above-described embodiment, and various forms are effective. For example, both the light source 201 and the light receiving element 202 may be disposed in the opening, a part of the light source 201 may be disposed in the opening, or a part of the light receiving element 202 may be disposed in the opening. Alternatively, a part of both the light source 201 and the light receiving element 202 may be disposed in the opening.

  By attaching the optical pickup module 4 configured using the above-described optical pickup unit 7 to the optical disc apparatus 1 shown in FIG. 1, it is possible to obtain an optical disc apparatus having an excellent heat dissipation effect in the light emitting section, and to achieve desired light emission. It is possible to realize an optical disc apparatus that guarantees the strength level and has excellent information recording / reproducing performance.

  INDUSTRIAL APPLICABILITY The present invention can be used as an optical pickup capable of ensuring an appropriate laser light intensity necessary for recording / reproducing information and an optical disc apparatus having excellent recording / reproducing quality.

Schematic diagram of an optical disc apparatus according to an embodiment of the present invention The figure which shows the structure of the optical pick-up module which concerns on embodiment of this invention The figure which shows the structure of the optical pick-up which concerns on embodiment of this invention. The figure which shows the wiring member cover structure which concerns on embodiment of this invention The figure which shows the wind of the optical disk device The figure which shows the optical system structure of the optical pick-up concerning this invention Configuration diagram of an optical pickup according to an embodiment of the present invention The figure which shows a mode that the relationship between the electric current which flows into a laser light source, and the emitted light intensity of a laser light source changes with change of environmental environment temperature

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk device 2 Case 2a, 2b Case part 3 Tray 3a Rail 3b Rail holding part 4 Optical pick-up module 5 Spindle motor 6 Cover 6a Opening part 7 Optical pick-up unit 8 Bezel 11 Carriage 31 Wiring member cover 31a 1st flat part 31b 2nd flat part 32 Actuator cover 36 Wiring member 106 Optical disk 201 Light source 202 Light receiving element

Claims (2)

A light-emitting element configured of a monoblock on one surface of the plate and emitting a plurality of light fluxes;
A light receiving element for receiving light reflected from the optical disc;
A wiring member connected to at least one of the light emitting element or the light receiving element;
A carriage to which the light emitting element, the light receiving element and the wiring member are attached;
A protective cover for covering the carriage,
The protective cover has an opening,
At least one of the light emitting element or the light receiving element is disposed in the opening ,
The wiring member is fixed by the carriage and a wiring member cover,
The wiring member cover covers at least one upper surface portion of the light emitting element or the light receiving element, and a first flat portion disposed under the protective cover and a second flat portion disposed in the opening. And
An optical disc apparatus characterized in that the upper surface of the second flat portion is disposed above the lower surface of the protective cover . The area of the second flat part optical disk apparatus according to claim 1, characterized in that a 20mm ² ~400mm ^2.

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