KR20100001704A - Optical pick-up device and optical disk drive including the same - Google Patents

Abstract

PURPOSE: An optical pick-up device and an optical disk drive including the same are provided to prevent the malfunction and error due to electrostatic discharge or electromagnetic interference. CONSTITUTION: A first and a second covers(130,140) cluster around an optical pick-up base. The first and second covers are each other connected in order to make the static electricity dischargeable. The first and second covers are each other connected to conduct. An electrostatic path part is connected to the first and second covers. The electrostatic path part comprises one or more ground terminals.

Description

Optical pick-up device and optical disk drive including the same}

The present invention relates to an optical disc drive, and more particularly, to an optical pickup device for reproducing data recorded on the data storage medium by irradiating light on the data storage medium and picking up the reflected light. An optical disk drive provided.

Among the data storage media, optical disks have been rapidly used due to the development of related technologies, and their data storage capacity is rapidly increasing, and thus, they are widely used. Optical disks are classified into compact disks (CDs) and digital versatile disks (DVDs) according to data storage capacity. Optical discs that can be recorded, erased and played back include 650MB CD-R, CD-RW, 4.7GB DVD-R, DVD + R, DVD-RW, DVD + RW, and HD-DVD with 20GB or more data storage capacity. Blu-ray discs are also available.

The optical disc drive includes an optical pickup device for reproducing data recorded on the optical disc by irradiating light onto the optical disc inserted therein and picking up the reflected light. Recently, the optical pickup base of the optical pickup device has been replaced by a plastic material rather than a metal according to the light weight, miniaturization and cost reduction of the optical disk drive. In addition, as the data storage capacity of the optical disc increases, the optical pickup device is driven by a signal of high frequency modulation. For this reason, the possibility that the static electricity generated in the optical pickup device is not easily released or the electromagnetic shielding is insufficient may cause malfunction or failure of the optical pickup device.

The present invention provides an optical pickup device capable of preventing malfunction or failure due to electrostatic discharge (ESD) or electromagnetic interference (EMI) and an optical disk drive having the same.

The present invention, the optical pickup base; At least one cover surrounding the optical pickup base and connected to each other so as to be electrostatically discharged; And an electrostatic passage unit connected to the cover, and an optical disc drive including the optical pickup device.

According to an embodiment of the present invention, the electrostatic passage portion may include at least one ground terminal, and the ground terminal and the cover may be electrically connected to each other.

An optical pickup apparatus according to an embodiment of the present invention may include a plurality of covers, and the plurality of covers may be electrically connected to each other.

In the optical pickup device of the present invention, the optical pickup base is surrounded by the cover, and the cover and the flexible printed circuit are electrically connected to each other to prevent malfunction or failure of the optical pickup device due to ESD or EMI.

Hereinafter, an optical pickup apparatus and an optical disk drive including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view showing an example of an optical disk drive according to an embodiment of the present invention.

Referring to FIG. 1, an optical disk drive 100 according to an embodiment of the present invention is a slim type optical disk drive that can be mounted on a portable electronic device such as a notebook PC, and an optical disk D, which is a data storage medium, is inserted therein. And a turntable 112 for chucking and rotating the optical disk D located in the center of the housing 101 at high speed, and the optical disk D rotating at high speed. And an optical pickup device 120 for picking up the light reflected by the optical disk D and reproducing the data stored in the optical disk D.

The housing 101 is composed of a base 102 and a cover 103 coupled to each other. The optical pickup device 120 and the turntable 112 are included in the main unit 110. The optical pickup device 120 is mounted to the main unit 110 along the arrow R, that is to move toward the turntable 112 or move away from the turntable 112.

2 is an exploded perspective view illustrating an optical pickup apparatus according to an exemplary embodiment of the present invention, FIG. 3 is an enlarged perspective view of A of FIG. 2, and FIG. 4 is an enlarged perspective view of B of FIG. 2. 5 is an enlarged perspective view of C of FIG. 2. The optical pickup device 120 of FIGS. 2 to 5 is shown upside down from each other so that the characteristic configuration of the present invention can be clearly shown.

2, the optical pickup device 120 of the present invention includes an optical pickup base 121 made of a plastic material, and one side (lower side in FIG. 2) and the other side (in FIG. 2) of the optical pickup base 121. And a first cover 130 and a second cover 140, and a circuit board 150 interposed between the optical pickup base 121 and the first cover 130.

The optical pickup base 121 may include, for example, a light source (not shown) such as a laser diode (LD), a photo sensor (not shown) for receiving light reflected from the optical disc D; And a space for accommodating an optical system (not shown) including a lens and the like. The first cover 130 and the second cover 140 are formed of a metal material to perform a grounding function for emitting static electricity and an electromagnetic interference (EMI) shielding function. The circuit board 150 is a flexible circuit board and typically includes a main circuit board connection portion 156 connected to a main circuit board (not shown) provided on the base 102 (see FIG. 1).

The circuit board 150 is mounted with a light source driving element 151 such as a laser diode driver (LDD), for example. As the data storage capacity of the optical disc D (see FIG. 1) increases, the light source driving device 151 processes a high frequency modulated signal, which is emitted from the light source driving device 151. The strength of the EMI can be increased. The first cover 130 and the second cover 140 surround the optical pick-up base 121 and the flexible circuit board 150 over a large area so that the EMI emitted to the outside of the optical pick-up device 120 is significantly reduced. Can be reduced to a level.

2 and 3, a circuit board ground terminal 154 is formed at one end of the flexible circuit board 150, and the first cover 130 and the first corresponding to the position of the ground terminal 154 are formed. One end of the second cover 140 is provided with a first connecting portion 132 of the first cover and a first connecting portion 142 of the second cover, respectively. The first connecting parts 132 and 142 and the ground terminal 154 are electrically connected by a screw 160 made of a metal material. Hereinafter, one end of the first cover 130, the second cover 140, and the flexible circuit board 150 that are electrically conductively connected will be referred to as a 'first electrostatic discharge structure'. The first static electricity dissipation structure helps facilitate the discharge of static electricity. Accordingly, the optical disk drive 100 (see FIG. 1), which may be caused by high voltage static electricity generated by the optical pickup device 120, may flow into elements mounted on the main circuit board (not shown) or the flexible circuit board 150. Malfunctions or permanent damage can be suppressed.

2 and 4, the first cover 130 includes an extension 133 that is bent toward the second cover 140 spaced apart from each other with the optical pickup base 121 interposed therebetween. do. The second connection portion 134 is provided at the end of the extension portion 133. The second connecting portion 144 of the second cover is provided at the other end of the second cover 140 corresponding to the position of the second connecting portion 134 of the first cover. The second connecting portions 134 and 144 of the first cover 130 and the second cover 140 are electrically connected to each other by being in contact with each other. In order to improve the reliability of the conductive connection, the second connectors 134 and 144 may be connected using a conductive adhesive medium 164 such as solder or silver paste. Hereinafter, the other ends of the first cover 130 and the second cover 140 that are conductively connected are referred to as a 'second electrostatic discharge structure'. The second static electricity dissipation structure also facilitates easy discharge of static electricity. Accordingly, the optical disk drive 100 (see FIG. 1), which may be caused by high voltage static electricity generated by the optical pickup device 120, may flow into elements mounted on the main circuit board (not shown) or the flexible circuit board 150. Malfunctions or permanent damage can be suppressed.

2 and 5, the flexible circuit board 150 includes a light source driving element ground terminal 152 at a position adjacent to the light source driving element 151. The third connection part 146 of the second cover is provided at the position of the second cover 140 corresponding to the position of the light source driving element ground terminal 152. The light source driving element ground terminal 152 and the third connection portion 146 of the second cover are electrically connected to each other by being in contact with each other. In order to improve the reliability of the conductive connection, the light source driving element ground terminal 152 and the third connection portion 146 may be formed using a conductive adhesive medium 162 such as solder or silver paste. You can also connect. Hereinafter, the conductively connected light source driving element ground terminal 152 and the third connection portion 146 will be referred to as a 'third electrostatic discharge structure'.

The third static electricity dissipation structure also facilitates easy discharge of static electricity. In particular, the light source driving device 151 is a device that frequently generates static electricity during data processing of the optical disk drive 100 (refer to FIG. 1), and the long static electricity generated by the high voltage static electricity passing through the circuit board ground terminal 154 is generated. It can be discharged through a short static discharge path passing through the light source driving element ground terminal 152 without passing through the discharge path. Accordingly, the high-voltage static electricity generated by the light source driving element 151 may be caused to flow into the elements mounted on the main circuit board (not shown) or the flexible circuit board 150, thereby causing the optical disk drive 100 (see FIG. 1). Malfunctions or permanent damage can be suppressed.

When the inventors of the present invention input pulse signals of the same 300 MHz frequency to six optical pickup devices of the present invention and six conventional optical pickup devices described with reference to Figs. Levels were measured and compared, and the experimental results are shown in Table 1 below.

Set No. EMI Levels of Conventional Optical Pickup Devices EMI level of the optical pickup device of the present invention One 49.98 38.02 2 54.47 40.45 3 52.02 36.98 4 54.26 39.9 5 53.55 41.42 6 55.49 38.82 Average 53.3 39.3

As can be seen from the average difference in the above experimental results, the optical pickup device of the present invention exhibited an EMI level reduction effect of an average of 14 kHz in one tube compared to the conventional optical pickup device.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a plan view showing an example of an optical disk drive according to an embodiment of the present invention.

2 is an exploded perspective view showing an optical pickup device according to an embodiment of the present invention.

3 is an enlarged perspective view illustrating A of FIG. 2.

4 is an enlarged perspective view of B of FIG. 2.

5 is an enlarged perspective view illustrating C of FIG. 2.

<Description of the symbols for the main parts of the drawings>

100 ... Optical disc drive 101 ... Housing

110 ... the main unit 112 ... the turntable

120 ... Optical pickup unit 121 ... Optical pickup base

130 ... first cover 140 ... second cover

150 ... flexible circuit boards 151 ... light source drive elements

152, 154 ... ground terminal 156 ... main circuit board connection

Claims (4)

Optical pickup base; At least one cover surrounding the optical pickup base and connected to each other so as to be electrostatically discharged; And an electrostatic passage portion connected to the cover. According to claim 1, And the electrostatic passage portion includes at least one ground terminal, and the ground terminal and the cover are electrically connected to each other. According to claim 1, And a plurality of covers, and the plurality of covers are electrically connected to each other. An optical disc drive comprising the optical pickup device according to any one of claims 1 to 3.

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