JP2006294134A - Optical pickup module and optical disk system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup module where an inner periphery detection sensor can be installed without regard to an area for drawing an FPC. <P>SOLUTION: The optical pickup module 10 is provided with a spindle motor 2, an optical pickup 8, a feeding mechanism provided with a feed motor 4 for moving the optical pickup 8 between the inner periphery and the outer periphery of an optical disk, and an inner periphery detection sensor 9. The inner periphery detection sensor 9 is provided with a detection sensor 9a and a part to be detected 9b to detect arriving of the optical pickup 8 at the innermost periphery of the optical disk. The detection sensor 9a is provided adjacently to the spindle motor 2 on a side facing the optical pickup 8. The part to be detected 9b is provided at the pickup 8 facing the detection sensor 9a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical pickup module and an optical disc apparatus that are preferably mounted on a personal computer or a notebook computer.

  With recent reductions in size and weight of personal computers, particularly notebook computers, optical disk devices mounted on them have been promoted to be smaller and lighter. In such movement, a feed mechanism for moving an optical pickup device that records and reproduces information on an optical disk from the inner periphery to the outer periphery of the optical disc has been reduced in size and weight. On the other hand, the optical disc was originally only a CD (compact disc) system, but a DVD (digital versatile disc) system has been added, and a BD (Blu-ray disc) and HD DVD (high definition DVD) are being added. As these generations are newer, the recording density is improved, more precise control of the optical pickup device is required, and more precise driving of the feed mechanism has been required. In these movements, the feed motor was changed from a DC motor to a stepping motor capable of more accurate rotation control. In addition, the screw shaft that converts the rotational drive of the feed motor to a linear drive has been changed from an indirect drive via a gear to a direct drive directly connected to the motor.

  FIG. 4 is a perspective view of a conventional optical pickup module. The protective cover is removed. The base 101 forms a framework of the optical pickup module 110, and each component is mounted directly or indirectly on the base 101. The spindle motor 102 includes a turntable 102a on which the optical disk is placed, and rotates the optical disk. The spindle motor 102 is mounted on the substrate 103, and the substrate 103 is fixed to the base 101.

  The feed mechanism is configured as follows. The feed motor 104 is a drive motor that moves the optical pickup 108 between the inner periphery and the outer periphery of the optical disk. The feed motor 104 includes a DC motor, a stepping motor, and the like. However, the feed motor 104 is shifting to a stepping motor capable of more precise drive control. The feed motor 104 is fixed to the base 101. The screw shaft 105 is directly connected to the feed motor 104, and a groove is formed in a spiral shape. The main shaft 106 and the sub shaft 107 are fixed to the base 101 via an adjustment member and a fixing member, and hold the optical pickup 108 movably. The optical pickup 108 includes a rack 108a having guide teeth. The rack 108 a converts the rotational driving force of the feed motor 104 transmitted to the screw shaft 105 into a linear driving force, so that the optical pickup 108 can move between the inner periphery and the outer periphery of the optical disc.

  The optical pickup 108 includes a laser light source, an optical system that guides the laser light emitted from the laser light source to an objective lens that focuses the optical disk, and a sensor that detects light reflected from the optical disk. The optical pickup 108 performs at least one of information recording and reproduction on the optical disc.

  The inner circumference detection sensor 109 is a sensor that detects that the optical pickup 108 is on the innermost circumference of the optical disk. The inner circumference detection is necessary for recognizing the initial position of the optical pickup 108 as the optical disk device. If the optical pickup 108 moves to the innermost circumferential position and performs the TOC operation, and the TOC operation can be performed, the optical pickup 108 becomes the optical disk device. The initial position can be recognized. If the position of the optical pickup 108 is known, the optical pickup 108 is in the data area of the optical disk unless the servo is disconnected. Therefore, the optical pickup 108 does not move to the outermost periphery outside the data area, and an outer periphery detection sensor is necessary. And not. The inner circumference detection sensor 109 is configured by a contact sensor, a non-contact sensor or the like provided on the substrate 103. In the case of this conventional example, a non-contact sensor is used in which a light beam is emitted from the detection sensor 109a, reflected by the detected portion 109b, and received by the detection sensor 109a again.

The optical pickup 108 is provided with an FPC (not shown) for transmitting a signal from the outside to the inside of the optical pickup 108 and conversely transmitting a signal from the optical pickup 108 to the outside. The FPC is extracted from the position of the region A and connected to the substrate 103. Refer to (Patent Document 1) for the feed mechanism and (Patent Document 2) for the inner circumference detection sensor.
JP-A-11-232654 JP-A-10-11917

  By the way, depending on the model of the FPC, there is an optical pickup drawn out from the area B in FIG. In such a model, since the FPC and the detected portion 109b of the inner circumference detection sensor 109 interfere with each other, such an inner circumference detection sensor cannot be applied.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems and to provide an optical pickup module in which an inner circumference detection sensor can be installed regardless of the FPC drawer area.

  In order to achieve the above object, an optical pickup module of the present invention comprises a turntable on which an optical disk is placed, a spindle motor that rotates the optical disk, and light that performs at least one of recording and reproduction of information with respect to the optical disk. A pickup mechanism, a feed mechanism having a feed motor for moving the optical pickup between the inner periphery and the outer periphery of the optical disc, and a detection sensor provided adjacent to the spindle motor on the side facing the optical pickup And a detected portion provided on the optical pickup opposite to the detection sensor, and an inner circumference detection sensor for detecting that the optical pickup has reached the innermost circumference of the optical disc. .

  Since the detection sensor is provided adjacent to the spindle motor on the side facing the optical pickup, and the detected part provided on the optical pickup is provided facing the detection sensor, the inner circumference detection sensor is brought into contact with the FPC drawer. Absent.

  In the optical pickup module of the present invention, since the inner circumference detection sensor does not contact the FPC drawer, the inner circumference detection sensor can be installed regardless of the position of the FPC drawer depending on the model.

  A first aspect of the present invention includes a turntable on which an optical disk is mounted, a spindle motor that rotates the optical disk, an optical pickup that records and / or reproduces information on the optical disk, and the optical pickup as an optical disk A feed mechanism having a feed motor for moving between the inner circumference and the outer circumference of the motor, a detection sensor provided adjacent to a spindle motor on the side facing the optical pickup, and a detection sensor provided on the optical pickup. And an inner periphery detection sensor that detects that the optical pickup has reached the innermost periphery of the optical disc.

  Since the inner circumference detection sensor does not contact the FPC drawer, the inner circumference detection sensor can be installed regardless of the position of the FPC drawer according to the model.

  According to a second aspect of the present invention, in the first aspect of the invention, the detection sensor includes a light beam emitting unit that emits a light beam and a light beam detection unit that detects the light beam reflected by the reflecting surface of the detected unit. The optical pickup module includes a light reflection surface that reflects a light beam emitted from the light emission unit and causes the light beam to enter the light beam detection unit.

  The optical pickup can be stopped without giving an impact to the feed mechanism, and abnormal noise can be prevented.

  A third aspect of the present invention is an optical pickup module comprising the substrate provided with the spindle motor and the detection sensor according to the first aspect of the present invention.

  Since the spindle motor and the detection sensor are provided on a common substrate, the position of the detection sensor with respect to the spindle motor is in a fixed position, and the positioning reproducibility is good.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the optical pickup is an optical pickup module provided with a two-wavelength semiconductor laser light source.

  An optical pickup provided with a two-wavelength semiconductor laser light source requires fewer parts of the optical system than an optical pickup provided with two semiconductor laser light sources. Therefore, it is possible to reduce the size and weight while providing the detected portion.

  The invention according to claim 5 is the optical pickup module according to claim 1, wherein the feed motor is a stepping motor.

  A stepping motor can perform precise drive control, but it is easy to step out. By combining with the inner circumference detection sensor according to the present invention, there is no possibility that the optical pickup will collide with the innermost circumference even if it is out of step.

  The invention of claim 6 is the optical pickup module in which the feed motor is directly connected to the screw shaft in the invention of claim 1.

  It can be used without decelerating the rotation of the feed motor.

  A seventh aspect of the invention is an optical pickup module according to the first aspect of the invention, wherein the detected part is provided by cutting out a portion of the optical pickup facing the spindle motor.

  A detected part that reacts reliably can be provided. Further, since the detected portion can be provided without increasing the outer shape of the optical pickup at the detected portion, it is not necessary to increase the outer shape of the optical pickup module.

  An eighth aspect of the present invention is an optical disc apparatus including the optical pickup module according to the first aspect of the present invention.

  Since the inner circumference detection sensor does not come into contact with the FPC drawer, the inner circumference detection sensor can be installed regardless of the position of the FPC drawer according to the model.

(Embodiment 1)
Hereinafter, Embodiment 1 will be described with reference to the drawings. FIG. 1 is a configuration diagram of an optical pickup module according to the first embodiment. The protective cover is removed. The base 1 forms the framework of the optical pickup module 10, and each component is mounted directly or indirectly on the base 1. The spindle motor 2 includes a turntable 2a on which an optical disk is placed, and rotationally drives the optical disk. The spindle motor 2 is mounted on the substrate 3, and the substrate 3 is fixed to the base 1.

  The feed mechanism is configured as follows. The feed motor 4 is a drive motor that moves the optical pickup 8 between the inner periphery and the outer periphery of the optical disk. Although the feed motor 4 includes a DC motor, a stepping motor, and the like, a stepping motor capable of more precise drive control is used. The feed motor 4 is fixed to the base 1. The screw shaft 5 is directly connected to the feed motor 4 and has a groove formed in a spiral shape. The main shaft 6 and the sub shaft 7 are fixed to the base 1 via an adjustment member and a fixing member, and hold the optical pickup 8 movably. The optical pickup 8 includes a rack 8a having guide teeth. The rack 8 a converts the rotational driving force of the feed motor 4 transmitted to the screw shaft 5 into a linear driving force, so that the optical pickup 8 can move between the inner periphery and the outer periphery of the optical disc.

  The optical pickup 8 includes a laser light source, an optical system that guides the laser light emitted from the laser light source to an objective lens that focuses the optical disk, and a sensor that detects light reflected from the optical disk. The optical pickup 8 performs at least one of information recording and reproduction on the optical disc.

  The inner circumference detection sensor 9 is a sensor that detects that the optical pickup 8 is on the innermost circumference of the optical disk. The inner circumference detection is necessary for recognizing the initial position of the optical pickup 8 as the optical disk device. If the optical pickup 8 moves to the innermost circumferential position and performs the TOC operation, and the TOC operation can be performed, the optical pickup 8 becomes the optical disk device. The initial position can be recognized. If the position of the optical pickup 8 is known, the optical pickup 8 is in the data area of the optical disk unless the servo is disconnected. Therefore, the optical pickup 8 does not move to the outermost periphery outside the data area, and an outer periphery detection sensor is necessary. And not.

  The inner circumference detection sensor 9 includes a detection sensor 9 a provided on the substrate 3 and a detected portion 9 b provided on the optical pickup 8. The detection sensor 9 a is provided in a region C provided adjacent to the spindle motor 2 on the side facing the optical pickup 8. It is also provided on the substrate 3. The detected portion 9b is provided in the optical pickup 8 so that the detected portion 9b faces the detection sensor 9a when the optical pickup 8 is located on the innermost circumference. In addition, the portion where the detected portion 9 b is installed is a portion facing the spindle motor 2 of the optical pickup 8, and the detected portion 9 b is provided by cutting out the portion, and an imaginary line region D along the spindle motor 2 is provided. The detected portion 9b is housed in a region that does not protrude. Therefore, the optical pickup 8 can be moved to the inner circumference without touching the spindle motor 2 without wasting space.

  In order to provide the detected portion 9b by cutting out such an optical pickup 8, it is desirable that the laser light source is a two-wavelength semiconductor laser light source. A two-wavelength semiconductor laser light source has a plurality of different-wavelength laser elements arranged adjacent to one package (a so-called hybrid-type two-wavelength semiconductor laser), and a light source with a plurality of wavelengths is integrated on one semiconductor substrate. There are semiconductor laser elements (so-called monolithic type two-wavelength semiconductor lasers). Both can emit laser light of two wavelengths in one package. When a two-wavelength semiconductor laser light source is used, not only one laser light source but also some optical components such as a lens can be omitted as compared with the case where two types of one-wavelength semiconductor laser light sources are used. For this reason, not only is the degree of design freedom large in designing the optical pickup 8 to be provided with the notched portion and the detected portion 9b installed, but the optical pickup 8 itself can be easily reduced in size and weight.

  Further, the optical pickup 8 includes an FPC (not shown) for transmitting a signal from the outside to the inside of the optical pickup 8 and conversely transmitting a signal from the optical pickup 8 to the outside. The FPC is pulled out from the position of the region A or the region B and connected to the substrate 3.

  When the FPC is pulled out from the area A, the FPC pull-out side and the detected part 9b are opposite side surfaces of the optical pickup 8, and the FPC and the inner circumference detection sensor 9 do not interfere with each other. When the FPC is drawn out from the area B, the area B is set outside the portion corresponding to the virtual line area D of the optical pickup 8. Therefore, also in this case, the FPC and the inner circumference detection sensor 9 do not interfere with each other.

  Next, the configuration of the inner circumference detection sensor 9 will be described. FIG. 2 is a configuration diagram of the inner circumference detection sensor used in the first embodiment. FIG. 2 shows an inner circumference detection state. The detection sensor 9a includes a light beam emitting unit 9c and a light beam detection unit 9d. The detected portion 9b includes a reflecting surface 9e. Infrared rays are emitted from the light emitting portion 9c. When the optical pickup 8 moves to the innermost circumference, infrared rays are incident and reflected on the reflecting surface 9e of the detected portion 9b, are incident on the light detecting portion 9d, are converted into electrical signals, and are controlled (not shown). ). Therefore, since the inner circumference is detected in a non-contact state and the movement of the optical pickup 8 is controlled, the impact applied to the feed mechanism is small.

  The inner circumference detection sensor 9 does not need to be a non-contact type as described above. A push switch may be used in place of the detection sensor 9a, and the optical pickup 8 itself may be detected as the detected portion 9b or when a newly detected detected portion 9b comes into contact. At that time, since the optical pickup 8 collides with the push switch, it is necessary to maintain sufficient rigidity.

  The detection sensor 9a includes an electric circuit, and is conveniently installed on a circuit board in order to be connected to the outside. In the first embodiment, the detection sensor 9a is also installed on the substrate 3 on which the spindle motor 2 is installed. Accordingly, since the positional relationship between the spindle motor 2 and the detection sensor 9a is fixed, the detection position on the inner periphery is stabilized.

(Embodiment 2)
The second embodiment will be described below with reference to the drawings. FIG. 3 is a perspective configuration diagram of the optical pick disk apparatus according to the second embodiment. In FIG. 3, the casing 21 is configured by combining an upper casing 21a and a lower casing 21b. The tray 22 is provided in the casing 21 so as to freely appear and disappear. The optical pickup module 10 shown in the first embodiment is mounted on the tray 22. The optical pickup module 10 includes a turntable 2a on which an optical disk is placed, a spindle motor 2 that rotates the optical disk, an optical pickup 8 that records or reproduces information on the optical disk, and an optical pickup 8 that is included in the optical disk. A feed mechanism including a feed motor 4 for moving between a circumference and an outer circumference and an inner circumference detection sensor 9 are provided. The protective cover 11 having an opening is provided in the optical pickup module 10 and exposes only the minimum necessary components of the optical pickup module 10. Therefore, the inner circumference detection sensor 9 of the optical pickup 8 is not exposed for the protective cover 11. The bezel 23 is provided on the front end surface of the tray 22, and is configured to close the entrance and exit of the tray 22 when the tray 22 is stored in the housing 21. A substrate 3 (not shown) is provided inside the housing 21 and the tray 22 and is equipped with a signal processing system IC, a power supply circuit, and the like. An external connector 24 (not shown) is connected to a power / signal line provided in an electronic device such as a computer. Then, power is supplied into the optical disk device 25 via the external connector 24, an electric signal from the outside is guided into the optical disk device 25, or an electric signal generated by the optical disk device 25 is sent to an electronic device or the like. To do. As described above, the optical disk apparatus 25 on which the optical pickup module 2 shown in the first embodiment is mounted can install the inner circumference detection sensor 9 regardless of the area from which the FPC of the optical pickup 8 is pulled out. It can be detected properly and stable operation can be achieved.

  As described above, the optical pickup module of the present invention can be operated stably because the inner circumference detection sensor can be installed regardless of the area from which the FPC of the optical pickup is pulled out. It is used for an optical disc apparatus that is preferably mounted on the optical disc.

Configuration diagram of optical pickup module according to Embodiment 1 Configuration diagram of inner circumference detection sensor used in the first embodiment Perspective configuration diagram of the optical disc apparatus of the second embodiment Perspective configuration diagram of a conventional optical pickup module

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Spindle motor 2a Turntable 3 Board | substrate 4 Feed motor 5 Screw shaft 6 Main shaft 7 Sub shaft 8 Optical pick-up 8a Rack 9 Inner circumference detection sensor 9a Detection sensor 9b Detected part 9c Light emission part 9d Light detection part 9e Reflective surface 10 Optical pickup module 11 Protective cover 21 Housing 21a Upper housing 21b Lower housing 22 Tray 23 Bezel 24 External connector

Claims (8)

A spindle motor that includes a turntable on which an optical disk is placed, and that rotates the optical disk;
An optical pickup that records and / or reproduces information with respect to the optical disc;
A feed mechanism comprising a feed motor for moving the optical pickup between the inner periphery and the outer periphery of the optical disc;
A detection sensor provided adjacent to the spindle motor on the side facing the optical pickup; and a detected portion provided on the optical pickup opposite to the detection sensor, wherein the optical pickup is an innermost part of the optical disc. An inner circumference detection sensor for detecting the arrival at the circumference,
An optical pickup module comprising: The detection sensor includes a light beam emitting unit that emits a light beam and a light beam detection unit that detects a light beam reflected by the reflection surface of the detected unit, and the detected unit reflects the light beam emitted from the light beam emitting unit. The optical pickup module according to claim 1, further comprising a light reflecting surface that is incident on the light detecting unit. The optical pickup module according to claim 1, further comprising a substrate on which the spindle motor and the detection sensor are provided. The optical pickup module according to claim 1, wherein the optical pickup includes a two-wavelength semiconductor laser light source. The optical pickup module according to claim 1, wherein the feed motor is a stepping motor. The optical pickup module according to claim 1, wherein the feed motor is directly connected to a screw shaft. 2. The optical pickup module according to claim 1, wherein the detected portion is provided by cutting out a portion of the optical pickup that faces the spindle motor. An optical disc apparatus comprising the optical pickup module according to claim 1.

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