WO2006112285A1

WO2006112285A1 - Disc device

Info

Publication number: WO2006112285A1
Application number: PCT/JP2006/307544
Authority: WO
Inventors: Masatoshi Adachi
Original assignee: Pioneer Corporation
Priority date: 2005-04-14
Filing date: 2006-04-10
Publication date: 2006-10-26
Also published as: JPWO2006112285A1; JP4685871B2

Abstract

A disc device (1) is provided with an optical pickup (23b) having a high frequency superposition circuit; a conductive case (10) with an opening section (13a) formed thereon; and a conductive member (30) provided to divide the opening section (13a) at a substantially middle section and connected to the case (10). Therefore, a quantity of unnecessary radiation noise leaking from the opening section (13a) reduces. The frequency of the unnecessary radiation noise generated from the opening section (13a) shifts to high frequency. Thus, the unnecessary radiation noise generated at the high frequency superposition circuit can be prevented from leaking to the outside by simply providing the conductive member (30) for the opening section (13a).

Description

Specification

Disk unit

Technical field

TECHNICAL FIELD [0001] The present invention relates to a high frequency generator and a disk device including a conductive casing that accommodates the high frequency generator therein.

Background art

Conventionally, for example, at least reproduction processing and recording processing for a disc such as a DVD (Digital Versatile Disk) and a CD (Compact Disc)! As a disk device that performs either one of them, a disk device that processes a disk by an optical pickup is widely used. In such a disk device, in order to suppress the return light noise of the laser diode of the optical pickup, a configuration in which the optical pickup is provided with a high-frequency superposition circuit that generates a high-frequency signal and superimposes the high-frequency signal on the laser drive current is known. It has been.

However, the high frequency superimposing circuit generates unnecessary radiation noise, and this unnecessary radiation noise leaks outside the disk device. For example, in the case of a disk device in which an optical pick-up provided with a high-frequency superposition circuit is provided inside a conductive housing and an opening for inserting and ejecting an optical disk is formed in this housing, unnecessary radiation is emitted from this opening. Noise leaks outside. Unnecessary radiation noise leaked to the outside has a problem of adversely affecting peripheral devices.

[0004] Conventionally, there has been known a laser light source unit that covers such a problem by covering the high-frequency superposition circuit itself with a conductive cover and preventing unnecessary radiation noise from leaking to the outside (for example,

Patent Document 1).

[0005] The laser light source unit described in Patent Document 1 includes a circuit board having a laser diode and a high frequency generation circuit for driving a laser diode including a high frequency generation element between a conductive frame and a conductive cover. It has. The circuit board also includes a ground pattern formed around the high frequency generation circuit on the circuit board and a connector post provided outside the high frequency generation circuit on the circuit board. The connector post is connected to the external power supply and data supply unit. The high-frequency generator circuit is connected to the conductive frame. And a grounding pattern, a conductive frame, and a conductive cover are electrically connected. As a result, unnecessary radiation noise generated by the high frequency generation circuit can be prevented from leaking out of the unit.

[0006] Patent Document 1: Japanese Patent Laid-Open No. 3-227585 (refer to page 2, Fig. 1)

Disclosure of the invention

Problems to be solved by the invention

However, in the configuration as described in Patent Document 1 described above, the configuration for preventing leakage of unnecessary radiation noise generated in the high-frequency generation circuit, such as covering the circuit board with a conductive cover, is complicated. As an example, there is a problem that there is a possibility of becoming.

[0008] In view of the above-described problems, the present invention provides a disk device that can prevent leakage of unnecessary radiation noise generated in a high-frequency generator to the outside with a simple configuration. Objective.

Means for solving the problem

[0009] The disc device of the present invention includes a high-frequency generator, and a conductive housing in which the high-frequency generator is accommodated and an opening that allows insertion and ejection of the disc is formed. The disk device further comprises a conductive member provided in a state in which at least a part of the opening is divided and connected to the housing.

[0010] The disc device of the present invention includes a high-frequency generator, and a conductive casing in which an opening that accommodates the high-frequency generator and allows insertion and ejection of the disc is formed. A disk device comprising: an insulating disk tray on which the disk is mounted and moving in a state where the disk can be inserted into and discharged from the inside of the housing; A first conductive member having a flat portion substantially parallel to a surface on which the disk is placed; and the first conductive member on the surface side of the disc tray of the housing on which the disk is placed. A second conductive member provided at a position facing the flat portion, having a flat portion provided substantially parallel to the flat portion of the first conductive member and in the vicinity of the flat portion; The disc tray A conductive member provided with a third conductive member provided at a position facing the first conductive member on the facing side and capable of contacting the first conductive member is provided. Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a disk device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the disk device in the first embodiment.

FIG. 3A shows a first state of the disk device, which is a side view showing a cross-section of the main part of the disk device in the first embodiment.

FIG. 3B shows a second state of the disk device, which is a side view showing a cross section of the main part of the disk device in the first embodiment.

FIG. 4 is an example for confirming the effects of the first embodiment, and is a graph showing the relationship between the frequency and intensity of unwanted radiation noise leaked to the outside of the disk device according to the present invention.

FIG. 5 is a comparative example for confirming the operation and effect of the first embodiment, and is a graph showing the relationship between the frequency and intensity of unwanted radiation noise leaked to the outside of a conventional disk device.

FIG. 6 is a perspective view showing a main part of a disk device in a second embodiment of the present invention.

FIG. 7A shows a first state of the disk device, which is a side view showing a cross-section of the main part of the disk device in the second embodiment.

FIG. 7B shows a second state of the disk device, which is a side view showing a cross section of the main part of the disk device in the second embodiment.

FIG. 8 is a perspective view showing a modification of each of the embodiments of the present invention.

FIG. 9A shows a first state of the disk device, which is a side view showing a cross section of the main part of the disk device in the modified example.

FIG. 9B shows a second state of the disk device, which is a side view showing a cross section of the main part of the disk device in the modified example.

FIG. 10 is a perspective view showing a modification of the embodiment in the present invention.

Explanation of symbols

[0012] 1 disk device

2 disk unit

3 disk units

4 disk unit Enclosure

a opening

A1 metal casing

A10 opening

b Optical pickup disc tray with high frequency superimposing circuit as high frequency generator

aDisc tray body

b Longitudinal plate

Conductive member

First conductive member

Second conductive member

Third conductive member

Conductive member

First conductive member

a Plane section

b Extension part

Second conductive member

c Plane section

Third conductive member

Conductive member

First conductive member

Second conductive member

Third conductive member

Conductive member

62 conductive members

A, 62A First conductive member

B, 62B Second conductive member

C, 62C 3rd conductive member D optical disc

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment described below, a disk device that records and reproduces information with respect to the recording surface of the optical disk will be described as an example. On the other hand, it may be configured to record / reproduce information. That is, the disk device of the present invention includes a high-frequency generator, and a conductive housing in which the high-frequency generator is accommodated and an opening that allows insertion and discharge of the disk is formed. As long as it is a disk unit! /, It may be a misaligned configuration.

[First Embodiment]

First, a first embodiment of the present invention will be described based on FIG. 1 and FIG.

FIG. 1 is an exploded perspective view showing a disk device according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the main part of the disk device.

[0015] (Configuration of disk unit)

In FIG. 1, a disk device 1 records and reproduces information on a recording surface (not shown) of an optical disk D that is detachably mounted. The disk device 1 includes a housing 10, a main body 20, and a conductive member 30.

The casing 10 covers the outside of the main body 20. The housing 10 includes a metal upper case 11, a metal lower case 12, and a synthetic resin decorative plate 13.

[0017] The upper case 11 has a top plate portion 11a having a substantially long rectangular shape on an upper surface portion thereof, and a pair of side plate portions l ib bent substantially vertically on both side edges in the longitudinal direction of the top plate portion 11a. And a back surface portion 11c that is bent downward from the rear end edge in the longitudinal direction of the top plate portion 11a by a predetermined angle. The top plate portion lla, the side plate portion llb, and the back surface portion 11c are integrally formed by, for example, a metal plate press carriage. The lower case 12 is a plate-like body formed in a substantially long rectangular shape by, for example, pressing a metal plate, and closes the lower surface of the upper case 11. The upper case 11 and the lower case 12 form a substantially rectangular shield box having an open front side.

The decorative board 13 is made of, for example, acrylonitrile-butadiene-styrene (ABS; Acrylonitrile-B It is formed in a substantially rectangular shape with a synthetic resin such as utadiene-styrene, and closes the front surface of the upper case 11. In addition, the inner surface of the decorative plate 13 is shielded with a metal film, for example. The decorative plate 13 is formed with a substantially long rectangular opening 13a through which the optical disk D can be inserted into and discharged from the inside of the apparatus. The longitudinal direction of the opening 13a is substantially parallel to the longitudinal direction of the decorative board 13.

The main unit 20 records and reproduces information by rotating the optical disc D and irradiating the recording surface of the optical disc D with laser light. The main body 20 includes a frame 21, a pedestal 22, a disk rotation driving means (not shown), an optical pickup device 23, a clamping mechanism 24, a disk tray 25, and a circuit board 27. .

The frame body 21 is formed in a substantially long rectangular frame shape in a plan view with a synthetic resin such as ABS, for example, and is disposed in the housing 10. The frame body 21 includes a pair of side surface portions 21a, a rear end surface portion 21b, a support rib 21c, and an interlocking mechanism disposing portion 21d. The side surface portions 21a are a pair of members formed in a substantially long rectangular shape, and are disposed on both sides of the frame body 21 in the longitudinal direction. The side portions 21a are in close contact with the inner surfaces of the pair of side plate portions ib in the upper case 11. The rear end surface portion 21b is formed in a substantially long rectangular shape, and is disposed on one end side in the longitudinal direction of the frame body 21. The rear end surface portion 21b is adhered to the inner surface of the back surface portion 11c in the upper case 11. The support ribs 21c are formed so as to protrude inward toward the inner surfaces of the side surface portion 21a and the rear end surface portion 21b. The interlocking mechanism disposing portion 21d is formed in a substantially long rectangular shape, and is disposed on the other end side in the longitudinal direction of the frame body 21. This interlocking mechanism disposing portion 21d is provided with an operating portion (not shown), and this operating portion is connected to the circuit board 27 in a state where various signals can be transmitted and received. This operation unit includes an eject button (not shown) for operating the forward and backward movement of the disc tray 25. This interlocking mechanism disposing portion 21d is provided with an interlocking mechanism 26. The interlocking mechanism 26 is connected to the circuit board 27 in a state where various signals can be transmitted and received, and the pedestal portion 22 is appropriately rotated and the display tray 25 is appropriately advanced and retracted by the control of the circuit board 27.

The pedestal portion 22 holds the disk rotation driving means and the optical pickup device 23, and rotates in the vertical direction in the figure by the action of the interlocking mechanism 26. The pedestal portion 22 is formed of a metal plate material or the like into a substantially rectangular plate frame shape, and the back side thereof is the support rib 2 in the frame body 21. It is attached to the back side of lc so that it can rotate in the vertical direction in the figure. An optical pickup hole 22 a is provided in the frame of the base portion 22. A disk table 22b is provided near the optical pickup hole 22a on the front side of the pedestal 22. The disk table 22b is formed in a planar circle that can rotate about a direction substantially orthogonal to the pedestal portion 22 as a rotation axis, and is provided so as to protrude from the upper surface of the pedestal portion 22 to the upper surface side. The disc table 22b includes a placement portion 22bl on which the optical disc D is placed, and a tapered portion 22b2 provided at the center of the placement portion 22bl. The tapered portion 22b2 is formed in a state where the upper surface side has a small diameter. The circular hole D1 of the optical disk D is engaged with the taper portion 22b2. A magnet is fitted on the upper surface side of the tapered portion 22b2.

The disk rotation driving means is disposed on the lower surface side of the disk table 22b and rotates the optical disk placed on the disk tray 25. In other words, the disk rotation driving means includes, for example, a motor and is connected to the circuit board 27 in a state where various signals can be transmitted and received. Then, the disk table 22b is rotated at a high speed under the control of the circuit board 27, and the optical disk D placed on the disk tray 25 is rotated.

The optical pickup device 23 moves along the radial direction of the optical disc D, irradiates the recording surface of the optical disc D with laser light, and receives reflected light from the recording surface. The optical pick-up device 23 includes moving means 23a and an optical pickup 23b.

The moving unit 23a moves the optical pickup 23b along the radial direction of the optical disc D.

The moving means 23a includes a pair of guide shafts 23al and a moving electric motor 23a2. The pair of guide shafts 23al are shaft members whose axial direction is substantially parallel to the longitudinal direction of the pedestal portion 22. The electric motor 23a2 for movement is arranged in a state where the axial direction of the output shaft is along the axial direction of the guide shaft 23al. On the outer peripheral surface of the output shaft of the electric motor for movement 23a2, an engagement groove (not shown) is provided in a spiral shape. The moving electric motor 23a2 is connected to the circuit board 27 in a state where various signals can be transmitted and received, and the output shaft is rotated under the control of the circuit board 27.

[0025] The optical pickup 23b is moved along the radial direction of the optical disc D by the moving means 23a, irradiates the recording surface of the optical disc D with laser light, and receives the reflected light from the recording surface. The The optical pickup 23b includes a pickup base 23b1, a semiconductor substrate including a high-frequency superimposing circuit (not shown), a light source (not shown), a converging lens 23b2, and an optical sensor (not shown).

[0026] The pickup base 23b 1 is a base that holds a light emitting element, a converging lens 23b2, a photosensor, a semiconductor substrate, and the like, and is slidably supported by a pair of guide shafts 23al. The pickup base 23bl includes a claw portion (not shown) that engages with the engagement groove of the output shaft of the moving electric motor 23a2. Then, when the claw portion engages with the engagement groove of the output shaft of the electric motor 23a2 for movement and the output shaft rotates, the pickup base 23bl is moved in the longitudinal direction of the base portion 22, that is, in the radial direction of the optical disc D. The

[0027] The semiconductor substrate is connected to the circuit board 27 in a state where various signals can be transmitted and received, and is connected to the light emitting element and the optical sensor in a state where various signals can be transmitted and received. This semiconductor substrate outputs a laser driving current to the light emitting element under the control of the circuit board 27. In addition, a high frequency superimposing circuit is provided on the semiconductor substrate, and this high frequency superimposing circuit superimposes a high frequency signal of about 300 MHz, for example, on the laser driving current output to the light emitting element. Then, the semiconductor substrate outputs the return optical signal received from the optical sensor to the circuit board 27.

The light emitting element is a laser diode provided on the semiconductor substrate, and irradiates the recording surface of the optical disc D with laser light based on the laser driving current supplied from the semiconductor substrate. The converging lens 23b2 converges the laser light emitted from the light emitting element. The optical sensor is provided on the semiconductor substrate. This optical sensor detects the return light reflected from the recording surface of the optical disc D by the laser light emitted from the light emitting element, generates a return light signal, and transmits the return light signal to the semiconductor substrate.

[0029] Here, since the high frequency superimposing circuit superimposes the high frequency signal on the laser driving current output to the light emitting element, the influence of the return light received by the laser light emitted by the light emitting element force is reduced. On the other hand, when the high frequency superimposing circuit superimposes the high frequency signal on the laser drive current, unnecessary radiation noise that is high frequency electromagnetic waves is generated from the periphery of the high frequency superimposing circuit, and this unnecessary radiation noise is diffused inside the housing 10. . The unwanted radiation noise generated from this high-frequency superimposing circuit is an integral multiple of the frequency of the superimposed high-frequency signal (approximately 300 MHz). It has multiple frequency components (for example, 300MHz, 600MHz, 900, ζ, 1200ΜΗζ ...).

[0030] The clamp mechanism 24 is a mechanism that holds the optical disc D engaged by the disc table 22b so as not to be detached from the disc table 22b. The clamp mechanism 24 includes a clamper 24a. The clamper 24a is formed in a substantially disc shape and is provided in a rotatable state. A magnetic material (not shown) such as a metal plate is integrally attached to the clamper 24a, and the optical disk D is held in a state where it can be rotated between the disk table 22b and the clamper 24a by the magnetic force of the magnet on the disk table 22b. To do.

[0031] The disc tray 25 is loaded with the optical disc D, advances in the direction in which the optical disc D is inserted into the housing 10 from the opening 13a of the decorative plate 13, and the optical disc D is opened from the opening 13a to the housing. 1 0Retract to the outside. That is, the disc tray 25 includes a disc tray main body 25a and a longitudinal plate portion 25b. The disc tray main body 25a is formed in a substantially long rectangular shape by a synthetic resin which is an insulator. Then, by the action of the interlocking mechanism 26, the support rib 21c on the inner side of the frame 21 moves so as to be able to advance and retreat through the opening 13a in a direction substantially parallel to the longitudinal direction of the top plate 11a in the housing 10. . Further, a circular concave portion 25al on which the optical disk D is placed is provided on one end side in the longitudinal direction of the disc tray main body 25a so as to have a circular concave shape expanding upward. Further, an opening 25a2 is formed at a substantially central portion of the disc tray 25 at a portion corresponding to the disc table 22b and the optical pickup 23b. Further, the front side of the disc tray body 25a, that is, one end in the longitudinal direction, is formed of the same material as the decorative plate 13, and is a substantially long rectangular long plate portion that closes the opening 13a of the decorative plate 13. 25b is installed.

The circuit board 27 controls the operation of the entire disk device 1. Specifically, the circuit board 27 is formed in a flat plate shape having substantially the same dimensions as the lower case 12 of the housing 10, and is attached so as to close the lower surface of the frame body 21 and cover the main body portion 20. The circuit board 27 is equipped with a control circuit (not shown) for controlling the operation of the main body 20, and the interlock mechanism 26, the disk rotation driving means, the moving electric motor 23 a 2, and the optical pickup are connected to the control circuit. The semiconductor substrate 23b is connected in a state where various signals can be transmitted and received. In addition, the circuit board 27 is a cape that transmits and receives signals with a power line and various external electric machines (not shown). A connector portion 27a to which a detachable connector is detachably provided is provided. Then, the circuit board 27 operates the interlock mechanism 26 based on the input operation of the eject button of the housing 10 to move the disk tray 25 forward and backward. In addition, the optical disk D is rotated by the disk rotation driving means based on the signal input from the external force and the electric motor 23a2 for movement and the optical pickup 23b are controlled to emit laser light to a predetermined part of the optical disk D. Irradiate and receive the return optical signal, and perform recording and playback processing on the optical disc D.

The conductive member 30 is provided in a state in which at least a part of the opening 13 a of the decorative plate 13 is divided, and is connected to the housing 10. Then, unnecessary radiation noise generated in the high-frequency superimposing circuit of the optical pickup 23b is prevented from leaking outside the housing 10. Specifically, as shown in FIG. 2, the conductive member 30 includes a first conductive member 31, a second conductive member 32, and a third conductive member 33.

[0034] The first conductive member 31 is formed by bending a long rectangular metal plate having a predetermined width into a substantially C shape, and in the longitudinal direction of the long plate portion 25b in the disc tray 25. It is provided at approximately the middle position. The first conductive member 31 is a series extending across the front surface side of the longitudinal plate portion 25b and both side surfaces in the longitudinal direction of the longitudinal plate portion 25b in a state substantially orthogonal to the longitudinal direction of the longitudinal plate portion 25b. Provided. Specifically, the first conductive member 31 has a long rectangular front conductive portion 31a provided facing the front side of the long plate portion 25b at a substantially intermediate position in the long direction of the long plate portion 25b. I have. The front conductive portion 31a is provided in a state where its longitudinal direction is substantially orthogonal to the longitudinal direction of the longitudinal plate portion 25b. Further, both end portions in the longitudinal direction of the front conductive portion 31a are provided with connecting portions 31b which are bent so as to extend along the longitudinal plate portion 25b in a direction substantially orthogonal to the front conductive portion 31a. Yes. Further, a first contact portion 31c is formed in a series in a bent manner so that the other end sides of the connecting portions 31b extend in directions facing each other.

[0035] The second conductive member 32 is formed by bending a long rectangular metal plate having a predetermined width into a predetermined shape, and the first conductive member 31 on the top plate portion 11a side. It is provided at the opposite position. The second conductive member 32 can contact the first conductive member 31 and biases the first conductive member 31 in the contact direction when contacting the first conductive member 31. . Specifically, the second conductive member 32 is formed on the front side of the inner surface of the top plate 11a and the first conductive member 32a. A long rectangular attachment portion 32a is provided at a position facing the member 31 so as to be energized. The front end of the mounting portion 32a extends in a direction substantially orthogonal to the lower case 12, and is further substantially orthogonal to the front side of the decorative board 13 along the peripheral end surface of the opening 13a. The connecting portion 32b is formed so as to be bent in the extending direction. On the other end side of the communication portion 32b, a second rectangular rectangular contact is formed that is bent so as to extend in a direction opened by a predetermined angle with respect to the front surface of the decorative plate 13. The tangent 32c is provided in a series. The second abutting portion 32c is in contact with the top plate portion 11a side of the first abutting portion 31c of the first conductive member 31 in a state where the disc tray 25 is completely stored in the housing 10. The first contact portion 31c is urged in the contact direction. The metal material used for the second conductive member 32 is preferably a metal material having a high elastic modulus such as phosphor bronze or beryllium copper.

[0036] The third conductive member 33 is formed by bending a long rectangular metal plate having a predetermined width into a predetermined shape, and faces the first conductive member 31 on the lower case 12 side. It is provided at the position where The third conductive member 33 can contact the first conductive member 31 and biases the first conductive member 31 in the contact direction when contacting the first conductive member 31. . Specifically, the third conductive member 33 includes a long rectangular attachment portion 33a attached to the front side of the inner surface of the lower case 12 and facing the first conductive member 31 so as to be energized. ing. The front end portion of the mounting portion 33a extends in a direction substantially orthogonal to the top plate portion 11a, and further substantially straight toward the front surface side of the decorative plate 13 along the peripheral end surface of the opening portion 13a. A connecting portion 33b that is bent to extend in the intersecting direction is provided. On the other end side of the connecting portion 33b, a third rectangular rectangular contact is formed that is bent in a direction extending in a direction opened by a predetermined angle with respect to the front surface of the decorative plate 13. A contact 33c is provided in a row. The third contact portion 33c contacts the lower case 12 side of the first contact portion 31c of the first conductive member 31 in a state where the disc tray 25 is completely stored in the housing 10. The first contact portion 31c is urged in the contact direction. As the metal material used for the third conductive member 33, it is preferable to use a metal material having a high elastic modulus such as phosphor bronze or beryllium copper.

[0037] (Operation of disk unit) Next, the operation of the disk device 1 will be described with reference to FIGS. 3A and 3B. 3A and 3B are side views showing a cross section of the main part of the disk device, FIG. 3A shows a first state of the disk device, and FIG. 3B shows a second state of the disk device.

First, the optical disk D is placed in the circular recess 25al in the disk tray 25 in a state where the disk tray 25 moves in the backward direction and is completely ejected to the outside of the housing 10. Then, the interlock mechanism 26 is actuated by the operation of an unillustrated eject button, and the disk tray 25 advances toward the inside of the housing 10 with an urgent force. In the first state shown in FIG. 3A, the disk tray 25 is moving toward the inside of the housing 10, and the disk tray 25 is not completely stored inside the housing 10. In this state, the second contact portion 32c of the second conductive member 32 and the third contact portion 33c of the third conductive member 33 are opened by a predetermined angle with respect to the front surface of the decorative plate 13. , Become a state.

[0039] Furthermore, when the disc tray 25 moves toward the inside of the housing 10 and moves to the second state shown in FIG. 3B, that is, when the disc tray 25 is completely stored in the inside of the housing 10, The opening 13a of the plate 13 is closed by the long plate portion 25b of the disc tray 25. In this state, the second contact portion 32c of the second conductive member 32 contacts the top plate portion 11a side of the first contact portion 31c of the first conductive member 31, and the first contact portion 31c The abutting portion 31 c is urged in the abutting direction. Further, the third contact portion 33c in the third conductive member 33 contacts the lower case 12 side of the first contact portion 31 in the first conductive member 31, and the first contact portion 31c Energize in the contact direction. As a result, the first conductive member 31 is electrically connected to the top plate portion 11a of the housing 10 via the second conductive member 32, and the housing is connected via the third conductive member 33. The body 10 is electrically connected to the lower case 12.

In the second state shown in FIG. 3B, the interlocking mechanism 26 operates to rotate the pedestal portion 22 upward in the drawing, and the optical disc D can be rotated by the disc table 22b and the clamper 24a. Be held in state. The disk rotation driving means rotates the optical disk D at a high speed. The optical pickup device 23 moves along the radial direction of the optical disc D, irradiates the recording surface of the optical disc D with laser light, and receives the return light from the recording surface. At this time, the high frequency superimposing circuit superimposes a high frequency signal of about 30 OMHz, for example, on the laser driving current output from the light emitting element. As a result, high-frequency electromagnetic waves from the high-frequency superposition circuit Unnecessary radiation noise is generated, and this unwanted radiation noise is diffused inside the housing 10.

[0041] At this time, since the conductive member 30 is provided so as to divide a substantially middle portion of the opening 13a of the decorative plate 13 and is connected to the housing 10, unnecessary radiation noise generated in the high-frequency superposition circuit is opened. Prevent leakage from the part 13a to the outside of the housing 10. The effect of the conductive member 30 has been confirmed by the following experiment.

[0042] Here, in order to confirm the operational effect of the present embodiment, the following experiment for confirming the shielding effect of the conductive member 30 is performed, and the result will be described with reference to the drawings. FIG. 4 is an example for confirming the operational effects of the present embodiment, and is a graph showing the relationship between the frequency and intensity of unwanted radiation noise leaked to the outside of the disk device of the present embodiment. FIG. 5 is a comparative example for confirming the operational effects of the present embodiment, and is a graph showing the relationship between the frequency and intensity of unwanted radiation noise leaked to the outside of the conventional disk device.

[0043] A disk device as an example used for the experiment is the disk device 1 shown in FIGS. 1 to 3A and 3B. In this disk device 1, the length of the long side of the opening 13a of the decorative plate 13 is about 130 mm, and the first conductive member 31, the second conductive member 32, and the third conductive member 33 are A long rectangular metal plate having a width of about 3 mm was used. Further, a conventional disk device as a comparative example used for the experiment is obtained by removing the conductive member 30 from the disk device 1 shown in FIGS. 1 to 3B.

In the experiment, a high-frequency signal having a frequency of about 300 MHz was generated by the high-frequency superimposing circuit in each disk device. Then, using a general unwanted radiation noise detector, the frequency of the unwanted radiation noise leaked from each opening and the intensity at that frequency were measured. As a result, the experimental results for the disk device 1 of the present embodiment shown in FIG. 4 and the experimental results for the conventional disk device shown in FIG. 5 were obtained. Note that the dotted line X shown in FIGS. 4 and 5 is a guide for making it easier to compare the results of FIGS.

When the experimental results are verified, as shown in FIG. 4, in the disk device 1 of the present embodiment, a characteristic noise peak is observed at about 950 MHz in unnecessary radiation noise leaked from the opening portion 13a. Its intensity was about 43dB V / m. In addition, the peak height at 950 MHz, that is, the intensity of the peak apex at the 950 MHz and the peak base end. The difference from the intensity of the noise was about 6 (1Β / ζ VZm. On the other hand, in Fig. 5, in the conventional disk unit, the noise peak characteristic at about 950 MHz was observed for the unwanted radiation noise that leaked the opening force. The intensity was about 50 (1 Β / ζ VZm. The peak height was about 12 (1 Β / ζ VZm. From these results, the disk device 1 of the present embodiment The unnecessary radiation noise leaked from the opening 13a was halved compared to the conventional disk device, and the shielding effect due to the provision of the conductive member 30 was confirmed.

Here, the shielding effect by the conductive member 30 will be considered. First, the characteristics of unwanted radiation noise! I will explain in a moment. There are two types of propagation of unwanted radiation noise: conductor conduction and spatial conduction. In particular, unwanted radiation noise with a high frequency is dominant in propagation by spatial conduction. That is, unnecessary radiation noise generated in the high-frequency superimposing circuit of the optical pickup 23b is diffused into the internal space of the housing 10 due to spatial conduction of what is radiated from the noise source. In many cases, the higher the higher harmonics, that is, the higher the frequency, the smaller the energy.

[0047] Further, since unnecessary radiation noise is conducted through the conductor, a high-frequency current flows through the conductor. This high-frequency current has a tendency to flow to the skin and end of the conductor as the frequency of the high-frequency current increases, and the path through which this high-frequency current flows depends on the shape of the conductor. In other words, in the present embodiment, a rectangular parallelepiped shield box is formed by the upper case 11, the lower case 12, and the decorative plate 13, and a long rectangular slot is formed by an opening 13a on the front side of the shield box. Is formed. Then, a loop is formed in which the high-frequency current generated from the unnecessary radiation noise generated in the high-frequency superposition circuit flows through the periphery of the opening 13a easily along the periphery of the opening 13a. The relationship shown in (Equation 1) is established between the area S in the loop through which this high-frequency current flows and the radiation field intensity E.

[0048] (Formula 1)

(K: constant, S: area in loop, I: current value of high-frequency current, f: frequency of high-frequency current, d: thickness of conductor layer)

[0049] From this (Equation 1), the smaller the area S in the loop, the smaller the radiated electric field strength E, that is, the amount of unnecessary radiation noise that has been conducted through the space from the opening 13a is reduced. It is a part of it.

[0050] Therefore, in this embodiment, since the conductive member 30 is provided in a state where the central portion on the front side of the opening 13a is divided, the area of the loop through which the high-frequency current flows is divided into two with the conductive member 30 as a boundary. The Therefore, it is considered that the amount of unnecessary radiation noise leaking from the opening 13a is reduced because the radiation field intensity E at the opening 13a is reduced.

[0051] In addition, in the structure of the casing 10 of the present embodiment, the opening 13a acts as a slot antenna, and unwanted radiation noise of a specific frequency is likely to be generated from the opening 13a. That is, the high-frequency current generated from the unwanted radiation noise generated in the high-frequency superposition circuit resonates at a specific frequency corresponding to the length of the long side of the opening 13a, and a strong electric field is generated in the opening 13a. Under these conditions, unnecessary radiation noise with a specific frequency is likely to be generated from the opening 13a.

[0052] Here, the relationship shown in (Equation 2) is established between the frequency of the unwanted radiation noise generated by the opening 13a acting as a slot antenna and the length of the long side of the opening.

[0053] (Formula 2)

f = c / 2x

(f: frequency of unwanted radiation noise generated from the opening, c: speed of light, X: length of the long side of the opening) [0054] From (Equation 2), the length X of the long side of the opening 13a is It can be seen that the shorter the frequency f of the unwanted radiation noise that is generated, the shorter. Based on this, the frequency f of the unwanted radiation noise generated by shortening the length X of the long side of the opening is shifted to the high frequency region and adjusted to a frequency band where the energy of the noise component is relatively small, thereby eliminating unwanted radiation. It can be seen that the noise problem can be solved.

Therefore, in this embodiment, since the conductive member 30 is provided in a state in which the substantially central portion on the front surface side of the opening 13a is divided, the length of the long side of the opening shown in (Equation 2) is Divided into two parts with conductive member 30 as the boundary. Therefore, the frequency of unwanted radiation noise generated from the opening shifts to the high frequency side (1 GHz or more). From the above, as shown in FIGS. 4 and 5, by providing the conductive member 30 in the disk device 1 of the present embodiment, unnecessary radiated noise leaked from the opening 13a is compared with the conventional disk device. It is thought that it was halved.

[0056] (Effects of disk device) As described above, in the first embodiment, the following operational effects can be achieved.

(1) An optical pickup 23b having a high-frequency superimposing circuit and an opening 13a in which the optical pickup 23b is housed and into which the optical disk D can be inserted and discharged are formed in the disk device 1. The conductive case 10 and the conductive member 30 connected to the case 10 are provided so as to divide the substantially middle part of the opening 13a. For this reason, the area of the loop of the high-frequency current flowing in the peripheral portion of the opening 13 a is divided into two with the conductive member 30 as a boundary based on the unnecessary radiation noise generated by the high-frequency superimposing circuit. Therefore, the radiated electric field intensity E at the opening 13a is reduced, and the amount of unnecessary radiation noise leaking from the opening 13a is reduced. In addition, the frequency of the unwanted radiation noise generated from the opening 13a is shifted to the high frequency side. Therefore, for example, the conductive member 30 is provided in the opening 13a that does not perform complicated shielding processing on the optical pickup 23b, and unnecessary radiation noise generated in the high-frequency superposition circuit is transmitted to the outside. Leakage can be prevented.

(2) The disc apparatus 1 is provided with a disc tray 25 on which the optical disc D is placed and moves in a state where the optical disc D can be inserted into and ejected from the inside of the housing 10. Further, the first conductive member 31 provided on the conductive member 30 on the front side of the disk tray 25 and the first conductive member 31 provided on the top plate 1 la side of the housing 10 are provided at positions facing the first conductive member 31. The second conductive member 32 that can be in contact with the first conductive member 31 and the first conductive member 31 provided on the lower case 12 side of the housing 10 facing the first conductive member 31 can be contacted. And a third conductive member 33. For this reason, when the disc tray 25 moves relative to the inside of the housing 10, each of the first conductive member 31, the second conductive member 32, and the third conductive member 33 is electrically connected and disconnected. . Further, when the optical disk D is placed on the disk tray 25, it is possible to take a shielding measure against the opening 13a through which unnecessary radiation noise leaks without causing the conductive member 30 to become an obstacle.

(3) The opening 13a in the decorative board 13 is formed in a long rectangular shape. Further, the disc tray 25 includes a disc tray main body 25a on which the optical disc D is placed, and a long rectangular plate 25b provided on the front side of the disc tray main body 25a and covering the opening 13a. Provided. Further, a series of first conductive members 31 are formed across the front surface side of the long plate portion 25b and both side surfaces in the long direction of the long plate portion 25b in a state substantially orthogonal to the long direction of the long plate portion 25b. so Provided. For this reason, the main part of the opening 13a through which unnecessary radiation noise leaks can be shielded by the first conductive member 31. Further, the first conductive member 31 can be electrically connected to the second conductive member 32 and the third conductive member 33 by providing the first contact portions 31c at both ends in the longitudinal direction of the front conductive portion 31a in the first conductive member 31, respectively. State. Therefore, a reliable shield measure can be taken for the opening 13a.

(4) The second contact member 32 c is provided on the second conductive member 32, and the third contact portion 33 c is provided on the third conductive member 33. The second abutting portion 32c is located on the top plate portion 11a side of the first abutting portion 31c of the first conductive member 31 in a state where the disc tray 25 is completely stored inside the housing 10. And the first contact portion 31c is urged in the contact direction. In addition, the third contact portion 33c contacts the lower case 12 side of the first contact portion 31c of the first conductive member 31 in a state where the disc tray 25 is completely stored in the housing 10. Then, the first contact portion 31c is urged in the contact direction. For this reason, since the second conductive member 32 and the third conductive member 33 are in close contact with the first conductive member 31, an electrical connection can be reliably ensured. Therefore, when the first conductive member 31 is provided on the dis- ister tray 25 that is moved to insert and eject the optical disc D into the apparatus, the first conductive member 31 can be reliably electrically connected to the housing 10. it can.

[0061] (5) The first conductive member 31, the second conductive member 32, and the third conductive member 33 are each formed of a long rectangular metal plate having a predetermined width in a predetermined shape. A fold was formed. For this reason, a reliable shield measure can be applied to the opening 13a with a simple configuration in which a long rectangular metal plate is bent into a predetermined shape. In addition, the conductive member 30 can be manufactured at low cost, and the conductive member 30 can be easily manufactured. Furthermore, the design can be easily changed by appropriately changing the shapes of the first conductive member 31, the second conductive member 32, and the third conductive member 33 in accordance with the structure of the disk device 1.

[0062] (6) A light emitting element that irradiates the recording surface of the optical disc D with a laser beam based on the laser drive current supplied to the optical pickup 23b in the disc device 1, and a high frequency to the laser drive current A high frequency superimposing circuit for superimposing signals is provided. For this reason, it is possible to realize a good recording / reproducing process for the optical disc D in which the laser light from the light emitting element does not interfere with the return light of the optical disc D force, and unnecessary radiation generated from the high-frequency superimposing circuit. Noise can also be prevented from leaking outside the disk device 1 by the conductive member 30.

(7) The first conductive member 31 is provided at a substantially intermediate position in the longitudinal direction of the longitudinal plate portion 25b in the disc tray 25. Further, the attachment portion 32a of the second conductive member 32 is attached to the front surface side on the inner surface of the top plate portion 11a and at a position facing the first conductive member 31. Further, the attachment portion 33 a of the third conductive member 33 is attached to the front side of the inner surface of the lower case 12 and at a position facing the first conductive member 31. For this reason, the area of the loop of the high-frequency current flowing through the peripheral portion of the opening 13a divided by the pair of conductive members 30 can be reduced. Therefore, the radiated electric field intensity E at the opening 13a can be reduced to the minimum, and the amount of unnecessary radiation noise leaking from the opening 13a can be efficiently reduced.

(8) The first conductive member 31 is formed by bending a long rectangular metal plate having a predetermined width into a substantially C shape. For this reason, in manufacturing the disk device 1, the first conductive member 31 can be easily attached to the longitudinal plate portion 25b of the data tray 25. Therefore, manufacturing efficiency can be improved.

(9) As the metal material used for the second conductive member 32 and the third conductive member 33, a metal material having a high elastic modulus such as phosphor bronze or beryllium copper is employed. For this reason, the second conductive member 32 and the third conductive member 33 are formed of a metal material having a high elastic modulus, so that the second conductive member 32 and The third conductive member 33 itself becomes a leaf spring, and can bias the first conductive member 31 in the contact direction. As a result, it is possible to ensure a reliable electrical connection with the first conductive member 31 with a simple configuration.

[Second Embodiment]

Next, a second embodiment of the present invention will be described with reference to FIG.

In the second embodiment shown in FIG. 6, the configuration of the conductive member 30 in the first embodiment shown in FIGS. 1 to 3B is changed. For this reason, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

[0067] (Configuration of disk unit)

In FIG. 6, the conductive member 40 is a fault generated in the high frequency superposition circuit of the optical pickup 23b. Prevents radiated noise from leaking outside the housing 10. Specifically, the conductive member 40 includes a first conductive member 41, a second conductive member 42, and a third conductive member 43.

[0068] The first conductive member 41 is formed by bending a long rectangular metal plate having a wide width with respect to the longitudinal direction of the opening 13a into a substantially L shape. The first conductive member 41 is provided at a position corresponding to the middle of the longitudinal plate portion 25b in the longitudinal direction on the front side of the disc tray body 25a opposite to the surface provided with the circular recess 25al. The first conductive member 41 includes a flat portion 41a and an extending portion 41b. The flat surface portion 41a is formed in a long rectangular shape whose longitudinal direction is substantially parallel to the longitudinal direction of the opening 13a. The flat surface portion 41a is provided on the opposite surface of the disc tray main body 25a from the longitudinal plate portion 25b to a portion substantially corresponding to the front side of the circumferential end portion of the circular concave portion 25al. Are provided in a state substantially parallel to. The extending portion 41b is bent and formed in a state in which the front side end portion of the flat surface portion 41a extends toward the third conductive member 43, that is, a state extending in a direction substantially orthogonal to the flat surface portion 41a. It is provided on the inner surface side of the longitudinal plate portion 25b.

[0069] The second conductive member 42 is formed by bending a long rectangular metal plate having a wide width in the longitudinal direction of the opening 13a into a predetermined shape. The second conductive member 42 is provided at a position corresponding to the middle of the longitudinal plate portion 25b in the longitudinal direction, at a position facing the first conductive member 41 in the top plate portion 11a of the housing 10. The second conductive member 42 includes a long rectangular mounting portion 42a attached to the front side of the inner surface of the top plate portion 11a and facing the first conductive member 41 so as to be energized. Yes. A connecting portion 42b that is bent in a state extending in a direction substantially orthogonal to the lower case 12 is provided at the front side end of the mounting portion 42a. On the other end side of the connecting portion 42b, there is provided a flat portion 42c that is bent so as to extend in a direction substantially orthogonal to the front surface side of the decorative plate 13 along the peripheral end surface of the opening portion 13a. It has been. The flat portion 42c is formed in substantially the same shape as the flat portion 41a of the first conductive member 41, and is provided in a state substantially parallel to the flat portion 41a of the first conductive member 41. The flat portion 42c of the second conductive member 42 is located in the vicinity of the flat portion 41a of the first conductive member 41 in a state where the disc tray 25 is completely stored inside the housing 10, thereby In plan view, the first conductive member 41 substantially overlaps the flat portion 41a. [0070] The third conductive member 43 is formed by bending a long rectangular metal plate having a predetermined width into a predetermined shape, and the first conductive member 43 on the lower case 12 side of the housing 10 is formed. It is provided at a position facing the member 41. The third conductive member 43 can contact the extended portion 41b of the first conductive member 41. When the third conductive member 43 contacts the extended portion 41b, the third conductive member 43 biases the extended portion 41b in the contact direction. To do. Specifically, the third conductive member 43 includes an attachment portion 43a in a state where one end side of a long rectangular metal plate having a predetermined width is bent at a substantially right angle. The attachment portion 43a is attached to the front side of the inner surface of the lower case 12 and a position facing the first conductive member 41, that is, a position corresponding to approximately the middle in the longitudinal direction of the longitudinal plate portion 25b. The third conductive member 43 bends the other end of the long rectangular metal plate into a semi-cylindrical shape, and the curved surface faces the extending portion 41b of the first conductive member 41. A protruding contact portion 43b is provided. Further, the third conductive member 43 includes an urging portion 43c in which an intermediate portion of the long rectangular metal plate is bent into a predetermined shape and the abutting portion 43b has an urging force in a direction facing the extending portion 41b. ing. With the urging portion 43c, the contact portion 43b contacts the extension portion 41b of the first conductive member 41 in a state where the disc tray 25 is completely accommodated in the housing 10, and the extension portion 41b is Energize in the contact direction. As the metal material used for the third conductive member 43, it is preferable to use a metal material having a high elastic modulus such as phosphor bronze or beryllium copper.

[0071] (Disk device operation)

Next, the operation of the disk device 2 will be described with reference to the drawings. Note that the operation of the second embodiment shown in FIG. 7B is the same as that of the first embodiment shown in FIGS.

In the first state shown in FIG. 7A, the disk tray 25 is moving toward the inside of the housing 10, and the disk tray 25 is not completely stored inside the housing 10. In this state, the planar portion 42c of the second conductive member 42 does not overlap the planar portion 41a of the first conductive member 41 in plan view, and the contact portion 43b of the third conductive member 43 is The first conductive member 41 is not in contact with the extended portion 41b.

[0073] Further, when the disk tray 25 moves toward the inside of the housing 10 and moves to the second state shown in FIG. 7B, that is, when the disk tray 25 is completely stored in the housing 10, The opening 13a of the plate 13 is closed by the long plate portion 25b of the disc tray 25. In this state, the planar portion 42c of the second conductive member 42 is located in the vicinity of the planar portion 41a of the first conductive member 41, and the planar surface of the first conductive member 41 is seen in plan view. It is in a state where it almost overlaps part 41a. Further, the contact portion 43b of the third conductive member 43 abuts on the extension portion 41b of the first conductive member 41, and urges the extension portion 41b in the contact direction by the action of the urging portion 43c. Yes. As a result, charges can be accumulated like a capacitor between the flat surface portion 41a of the first conductive member 41, the front side of the disc tray body 25a, which is an insulator, and the flat surface portion 42c of the second conductive member 42. And the second conductive member 42 is electrically connected to the top plate portion 11a of the housing 10. Further, the first conductive member 41 is in a state of being electrically connected to the lower case 12 of the housing 10 via the third conductive member 43.

In the second state shown in FIG. 7B, when the recording / reproducing process is performed on the optical disc D by the disc rotation driving means and the optical pickup device 23, the high-frequency superimposing circuit For example, a high-frequency signal of about 300 MHz is superimposed on the laser drive current output to. As a result, unnecessary radiation noise that is high-frequency electromagnetic waves is generated from the high-frequency superimposing circuit, and this unnecessary radiation noise is diffused inside the housing 10.

At this time, a capacitor is formed on the front side of the disc tray body 25a using the flat portion 41a of the first conductive member 41 and the flat portion 42c of the second conductive member 42 as electrodes. The capacitance varies depending on the area of the flat portion 41a and the flat portion 42c and the distance between them. If this capacitance is set so that the impedance is sufficiently low in the frequency band in question, it becomes equivalent to the conduction state at that frequency, and the same effect as in the first embodiment can be obtained. In other words, in this frequency band, the area of the opening is reduced, and even if unnecessary radiation noise of high frequency superposition circuit power leaks from the opening 13a to the outside of the device due to spatial propagation, it is composed of the flat portions 41a and 42c. It is shielded by the electric field of the capacitor. Also, when a strong electric field is generated in the opening 13a at a specific frequency corresponding to the length of the long side of the opening 13a due to the high-frequency current generated by unnecessary radiation noise from the high-frequency superposition circuit, the flat portions 41a and 42c As a result of the interference of the electric field of the capacitor constituted by the above, generation of unnecessary radiation noise of a specific frequency from the opening 13a is suppressed. [0076] (Function and effect of the disk device)

As described above, in the second embodiment, the following operational effects can be achieved.

(10) The disc device 2 is provided with an optical pickup 23b having a high-frequency superimposing circuit and an opening 13a in which the optical pickup 23b is accommodated and into which the optical disc D can be inserted and ejected. A conductive housing 10, a disk tray 25 on which the optical disk D is placed and the optical disk D can be inserted into and discharged from the inside of the housing 10, and a conductive member 40 are provided. The conductive member 40 is provided with a first conductive member 41 on the front side opposite to the surface provided with the circular recess 25al in the disc tray main body 25a. The first conductive member 41 is provided with a flat portion 41a in a state substantially parallel to the disc tray main body 25a. In addition, a second conductive member 42 is provided on the conductive member 40 at a position facing the first conductive member 41 in the top plate portion 11a of the casing 10, and the disk tray 25 is mounted on the second conductive member 42. In a state of being completely housed in the body 10, a flat portion provided in the vicinity of the flat portion 41a is provided opposite to the flat portion 41a of the first conductive member 41. Further, the conductive member 40 is provided with a third conductive member 43 provided at a position facing the first conductive member 41 on the lower case 12 side of the housing 10 and capable of contacting the first conductive member 41. Yes.

Therefore, when a high-frequency current is generated in the housing 10 due to unnecessary radiation noise from the high-frequency superimposing circuit, the flat surface portion 41a of the first conductive member 41 and the first conductive member 41 are arranged on the front side of the disc tray body 25a. Charges are accumulated between the two flat portions 42c of the conductive member 42. Then, a potential difference is generated between the flat portion 41a and the flat portion 42c, and an electric field is generated in the opening 13a along a direction substantially orthogonal to the longitudinal direction. As a result, even if unnecessary radiation noise from the high frequency superimposing circuit leaks out of the device from the opening 13a due to spatial propagation, it can be shielded by the electric field generated by the flat portions 41a and 42c. In addition, when a strong electric field is generated in the opening 13a at a specific frequency corresponding to the length of the long side of the opening 13a due to the high-frequency current generated by unnecessary radiation noise from the high-frequency superimposing circuit, the planar portion 41a By causing interference with the electric field generated by 42c, it is possible to suppress the generation of unnecessary radiation noise of a specific frequency from the opening 13a. Furthermore, since the first conductive member 41 is provided on the back surface of the disc tray body 25a, the first conductive member 41 is hidden from the appearance of the disk device 1. Secure design. Also, optical disk D Even when placed on the tray tray 25, it is possible to take a shielding measure against the opening 13a from which unnecessary radiation noise leaks without causing the conductive member 40 to become an obstacle. Therefore, for example, with a simple configuration in which the conductive member 40 is provided in the opening 13a that does not subject the optical pick-up 23b to complicated shielding treatment, leakage of unnecessary radiation noise generated in the high-frequency superposition circuit is prevented. Can be prevented.

(11) The first conductive member 41 is provided with an extending portion 41b that is bent so that the front side end of the flat portion 41a extends toward the third conductive member 43. Further, the third conductive member 43 can be brought into contact with the extended portion 41b of the first conductive member 41. When the third conductive member 43 comes into contact with the extended portion 41b, the extended portion 41b is urged in the contact direction. A third contact portion 43b is provided. For this reason, since the third conductive member 43 is in close contact with the first conductive member 41, the electrical connection can be reliably ensured. Therefore, the main part of the opening 13a from which unnecessary radiation noise leaks can be reliably shielded by the conductive member 40.

(12) The planar portion 41a of the first conductive member 41 and the planar portion 42c of the second conductive member 42 are formed in substantially the same shape. Therefore, the flat surface portion 42c of the second conductive member 42 is located in the vicinity of the flat surface portion 41a of the first conductive member 41 in a state where the disc tray 25 is completely stored inside the housing 10. As a result, the planar portion 41a of the first conductive member 41 substantially overlaps in plan view. Charges can be stored in a well-balanced manner on the front side of the data tray body 25a sandwiched between the flat surface portion 41a of the first conductive member 41 and the flat surface portion 42c of the second conductive member 42. Unwanted radiation noise can be shielded.

(13) The first conductive member 41, the second conductive member 42, and the third conductive member 43 are each formed of a long rectangular metal plate having a predetermined width. Bent to shape. For this reason, a reliable shield measure can be applied to the opening 13a with a simple configuration in which a long rectangular metal plate is bent into a predetermined shape. Further, the conductive member 40 can be manufactured at a low cost, and the conductive member 40 can be easily manufactured. Further, the design can be easily changed by appropriately changing the shapes of the first conductive member 41, the second conductive member 42, and the third conductive member 43 in accordance with the structure of the disk device 1. Furthermore, by adjusting the width dimension of each metal plate in the first conductive member 41 and the second conductive member 42, It is possible to adjust to a state in which unnecessary radiation noise can be well shielded.

(14) Based on the laser drive current supplied to the optical pickup 23b in the disk device 1, a light emitting element for irradiating the recording surface of the optical disk D with laser light, and the laser drive current A high frequency superimposing circuit for superposing a high frequency signal is provided. For this reason, it is possible to realize a good recording / reproducing process for the optical disc D in which the laser light from the light emitting element does not interfere with the return light of the optical disc D force, and unnecessary radiation noise generated from the high frequency superimposing circuit is also achieved. It is possible to prevent leakage to the outside of the disk device 1 by the conductive member 40.

(15) The first conductive member 41 is provided at a position corresponding to approximately the middle in the longitudinal direction of the longitudinal plate portion 25b. In addition, the attachment portion 42a of the second conductive member 42 is provided at a position corresponding to approximately the middle in the longitudinal direction of the longitudinal plate portion 25b on the inner surface of the top plate portion 11a. Further, the attachment portion 43a of the third conductive member 43 is provided at a position corresponding to the substantially middle in the longitudinal direction of the longitudinal plate portion 25b on the inner surface of the lower case 12. For this reason, an electric field can be generated by the flat portions 41a and 42c at the center in the longitudinal direction of the opening 13a, so that the amount of unnecessary radiation noise leaking from the opening 13a can be efficiently reduced. .

(16) The first conductive member 41 is formed by bending a long rectangular metal plate having a predetermined width into a substantially L shape. For this reason, in manufacturing the disc device 1, the first conductive member 41 can be easily attached to the front side of the disc tray 25 and the long plate portion 25b. Therefore, manufacturing efficiency can be improved.

(17) A metal material having a high elasticity coefficient such as phosphor bronze or beryllium copper is employed as the metal material used for the third conductive member 43. For this reason, by forming the third conductive member 43 from a metal material having a high elastic coefficient, the third conductive member 43 itself becomes a leaf spring without adopting a complicated biasing mechanism. One conductive member 41 can be urged in the contact direction. Therefore, a reliable electrical connection can be ensured with a simple configuration with respect to the first conductive member 41.

[Modification of Embodiment]

It should be noted that the present invention is not limited to the above-described embodiments, and includes the following modifications as long as the object of the present invention can be achieved. In each of the above embodiments, as described above, the disk device that records and reproduces information with respect to the recording surface of the optical disk D has been described as an example. For example, the recording / reproducing information may be performed on the recording surface of the magnetic disk. That is, the apparatus of the present invention is an apparatus including a high-frequency generator and a conductive casing in which the high-frequency generator is accommodated and an opening is formed in which the medium can be inserted and discharged. Any configuration is acceptable. In other words, the present invention can be applied to various electric products having similar problems that are not limited to disk devices.

In the first embodiment and the second embodiment, the decorative plate 13 in the housing 10 has a force that the inner surface of the decorative plate 13 is shielded. Not limited to this, the inner surface of the decorative plate 13 is shielded. It is good also as composition which is not given. In the case of such a configuration, the opening through which unnecessary radiation noise is leaked corresponds to the portion surrounded by the front side of the upper case 11 and the lower case 12 that is not in the opening 13a of the decorative board 13. However, in the first embodiment and the second embodiment, the conductive members 30 and 40 are provided between the top plate portion 11a of the housing 10 and the lower case 12, respectively. Even in a configuration in which the shield process is not performed, it is possible to prevent leakage of unnecessary radiation noise to the outside as in the above embodiments.

In the first embodiment, the disk device 1 is provided with the disk tray 25, which is a so-called tray type disk device. However, the present invention is not limited to this. That is, the present invention can be applied to the slot-in type disk device 3 shown in FIGS. 8, 9A, and 9B, for example. 8, 9A, and 9B, the disk device 3 has a configuration capable of performing information recording / reproduction processing on the recording surface of the optical disk D, as in the first embodiment. As shown in FIGS. 9A and 9B, the disk device 3 includes a disk device body (not shown) provided with a high-frequency superposing circuit, and a housing 10A that covers the disk device body. The casing 10A includes a rectangular parallelepiped metal casing 10A1 made of metal, and a decorative panel 10A2 provided on the front surface of the metal casing 10A1. An opening 10A10 for inserting and discharging the optical disk D into and out of the apparatus is formed on the front surface of the metal casing 10A 1, and the optical disk D is also inserted and discharged into the apparatus on the front surface of the decorative board 10A2. A second opening 10A20 is formed. Inside the disk unit body, there is a roller R And a conductive member 50 are provided.

[0090] Then, the conductive member 50 includes a first conductive member 51 obtained by bending a metal plate-like body into a hook shape, and the first conductive member 51 at the center of the opening 10A10 of the housing 10A1. A rotating mechanism having a hinge 52 that rotates to a covering state is provided. Further, as shown in FIG. 9A, the first conductive member 51 is rotated so as not to interfere with the optical disc D when the optical disc D is carried in and out of the apparatus. As shown in FIG. 9B, when the optical disk D is recorded / reproduced inside the apparatus, the first conductive member 51 is rotated so as to cover the central portion of the opening 10A10 of the metal casing 10A1. Moved. At this time, on the front side of the housing 10, the portion with which the rotating tip of the first conductive member 51 abuts corresponds to the second conductive member 53 of the present invention, and the first conductive member provided with the hinge 52 The rotation fulcrum side of 51 corresponds to the third conductive member 54 in the present invention. Even in such a configuration, unnecessary radiation noise generated from the high frequency superposition circuit can be prevented from leaking outside through the opening 10A10 of the metal casing 10A1. Note that the configuration in which the first conductive member 51 moves to cover the center of the opening 10A10 when the optical disc D is inserted and ejected is not limited to the configuration in which the first conductive member 51 is rotated using the hinge 52 as described above. First, the first conductive member 51 may be configured to move to a state where it is abutted along the front surface of the metal casing 10A1.

[0091] In the first embodiment, the first conductive member 31, the second conductive member 32, and the third conductive member 33 are positions corresponding to the substantially intermediate position in the longitudinal direction of the opening 13a. However, the present invention is not limited to this. That is, for example, the first conductive member 31, the second conductive member 32, and the third conductive member 33 are arranged in any of the longitudinal directions from a substantially intermediate position in the longitudinal direction of the opening 13 a. It is good also as a structure provided corresponding to the position slightly shifted a little. In such a configuration, the size of the two areas where the opening 13a is divided by the conductive member 30 is different from each other, so that the frequency at which each resonates is also different and may have a strong peak at a specific frequency. You can avoid sex.

In the first embodiment, only one conductive member 30 is provided in the disk device 1. In the second embodiment, only one conductive member 40 is provided in the disk device 2. However, the present invention is not limited to this, and a plurality of conductive members 30 and 40 may be provided along the longitudinal direction of the opening 13a. That is, for example As shown in FIG. 10, the disk device 4 having two conductive members 30 in the disk device 1 of the first embodiment shown in FIGS. 1 to 3B may be used. The disk device 4 in FIG. 10 includes a conductive member 60 composed of a pair of conductive members 61 and 62. The conductive members 61 and 62 include first conductive members 61A and 62A, second conductive members 61B and 62B, and third conductive members 61C and 62C, respectively. The shape is the same as the shape of each member in the conductive member 30 shown in FIGS. 1 to 3B. The conductive members 61 and 62 are arranged in a state in which the opening 13a is divided into three in the longitudinal direction. In such a configuration, the area where the opening 13a is divided by the conductive members 61 and 62 is smaller than that of the first embodiment shown in FIGS. 1 to 3B. It can be increased. Note that three or more conductive members may be provided along the longitudinal direction of the opening 13a. The greater the number of conductive members, the greater the effect of shielding unwanted radiation noise. Similarly, in the second embodiment, if a plurality of conductive members 40 are provided along the longitudinal direction of the opening 13a, the shielding effect of unnecessary radiation noise increases as the number of conductive members 40 increases. can do.

In the first embodiment, the first conductive member 31 is formed in a substantially C shape and attached to the front surface side of the longitudinal plate portion 25b of the disc tray 25. However, the present invention is not limited to this. That is, for example, the first conductive member 31 is formed in a long rectangular plate shape and attached to the inner surface side of the long plate portion 25b in a state of penetrating the front surface side of the disc tray main body 25a. Then, the second conductive member 32 and the third conductive member 33 may be electrically connected to both ends in the longitudinal direction of the first conductive member 31, respectively. In such a configuration, the same effects as those of the first embodiment can be obtained, and the first conductive member 31 can be hidden on the back side of the long plate 25b in appearance, thus ensuring good design. be able to.

In the second embodiment, the first conductive member 41 is formed in a substantially L shape and provided with the extension 4 lb. However, the present invention is not limited to this. That is, for example, the first conductive member 41 may have only a long rectangular flat surface portion 41a, and the third conductive member 43 may be in contact with the flat surface portion 41a in a biased state. Even in the case of such a configuration, the same operational effects as those of the second embodiment can be obtained.

In the second embodiment, the first conductive member 41 is attached to the disc tray body 25a. Although it is arranged on the opposite side of the surface provided with the circular recess 25al, it may be arranged on the same side as the surface provided with the circular recess 25al and used as a part of the design. With such an arrangement, the distance between the flat surface portion 41a and the flat surface portion 42c can be reduced, and the impedance can be further reduced.

[0096] In the second embodiment, one end of the first conductive member 41 is configured to be in close contact with the third conductive member 43. However, this portion also has the first conductive member 41 and the second conductive member. A configuration such as 42 may be used. In this case, the effect of the present invention can be obtained without contact with the disk tray because it is equivalent to two capacitors in series and is disadvantageous in terms of impedance.

[Operation and Effect of Embodiment]

As described above, in the first embodiment, the optical pickup 23b provided with the high frequency superimposing circuit in the disk device 1 and the optical pickup 23b are accommodated inside, and the optical disk D can be inserted into and discharged from the inside. There are provided a conductive case 10 in which an opening 13a is formed, and a conductive member 30 provided so as to divide a substantially middle portion of the opening 13a and connected to the case 10. For this reason, the area force of the loop of the high-frequency current flowing in the peripheral portion of the opening 13a is divided into two based on the unnecessary radiation noise generated by the high-frequency superimposing circuit. Therefore, the radiated electric field intensity E at the opening 13a is reduced, and the amount of unnecessary radiation noise leaking from the opening 13a is reduced. In addition, the frequency of the unwanted radiation noise generated from the opening 13a is shifted to the high frequency side. Therefore, for example, a simple configuration in which the conductive member 30 is provided in the opening portion 13a that does not perform complicated shielding processing on the optical pickup 23b, and unnecessary radiation noise generated in the high-frequency superposition circuit is leaked to the outside. Can be prevented.

In the second embodiment, the disk device 2 includes an optical pickup 23b having a high-frequency superposition circuit, a conductive casing 10 having an opening 13a formed therein, a disk tray 25, and a conductive layer. Member 40 is provided. The conductive member 40 is provided with a first conductive member 41 on the front side of the surface opposite to the surface provided with the circular recess 25al in the disc tray main body 25a. The first conductive member 41 is provided with a flat surface portion 41a so as to be substantially parallel to the disc tray main body 25a. In addition, the conductive member 30 is provided with a second conductive member 42 at a position facing the first conductive member 41 in the top plate portion 11a of the casing 10, and the first conductive member 42 is provided with the first conductive member 42. A flat portion provided near the flat portion 41a opposite to the flat portion 41a of the electric member 41 is provided. Further, the conductive member 30 is provided with a third conductive member 43 provided at a position facing the first conductive member 41 on the lower case 12 side of the housing 10 and capable of contacting the first conductive member 41. Yes. For this reason, when a high frequency current is generated in the housing 10 due to unnecessary radiation noise from the high frequency superimposing circuit, electric charges are sandwiched between the flat surface portion 41a and the flat surface portion 42c on the front side of the disc tray body 25a. Accumulated. This prevents unnecessary radiation noise from leaking from the opening 13a. Furthermore, since the first conductive member 41 is provided on the back surface of the disk tray body 25a, the first conductive member 41 is hidden from the appearance of the disk device 1! Good design can be secured.

Industrial applicability

The present invention can be used for a disk device including a high-frequency generator and a conductive housing that accommodates the high-frequency generator therein.

Claims

The scope of the claims

[1] A disk device comprising a high-frequency generator, and a conductive casing in which the high-frequency generator is housed and an opening through which the disk can be inserted and discharged is formed. Provided with a conductive member provided in a state in which at least a part of the part is divided and connected to the housing

A disk device characterized by the above.

[2] The disk device according to claim 1,

A disc tray on which the disc is placed and the disc moves in a state where the disc can be inserted into and ejected from the housing;

The conductive member is

A first conductive member provided on the front side of the disc tray;

A second conductive member provided at a position facing the first conductive member on one side of the housing with the disc tray interposed therebetween, and capable of contacting the first conductive member;

A third conductive member provided at a position facing the first conductive member on the other side of the housing with the disc tray in between, and capable of contacting the first conductive member. A disk device characterized.

[3] The disk device according to claim 2,

The disc tray includes a disc tray body on which the disc is placed, and a longitudinal plate-like longitudinal plate portion provided on the front side of the disc tray body,

The first conductive member is provided in a series between the front surface side of the longitudinal plate portion and both side surfaces in the longitudinal direction of the longitudinal plate portion in a state substantially orthogonal to the longitudinal direction of the longitudinal plate portion. Be

A disk device characterized by the above.

[4] The disk device according to claim 2 or claim 3,

The second conductive member and the third conductive member urge the first conductive member in the contact direction when they contact each of the first conductive members.

A disk device characterized by the above.

[5] The disc device according to any one of claims 1 and 4, wherein the conductive member is provided in a state in which the sizes of the divided regions of the opening are different from each other. Be

A disk device characterized by the above.

[6] A disk device comprising a high-frequency generator, and a conductive casing in which the high-frequency generator is housed and an opening through which the disk can be inserted and discharged is formed. And an insulating disc tray that moves in a state where the disc can be inserted into and discharged from the inside of the housing.

A first conductive member provided on the front side of the disc tray and having a flat portion substantially parallel to a surface on which the disc is placed;

In a state where the disc tray is provided in a position facing the first conductive member on the surface side of the disc tray of the housing where the disc is placed, and the disc tray is completely stored in the housing. A second conductive member having a flat portion opposed to the flat portion of the first conductive member and provided near the flat portion;

A conductive member provided at a position facing the first conductive member on the opposite surface side of the disk tray of the housing, and a third conductive member capable of contacting the first conductive member Equipped with

A disk device characterized by the above.

[7] The disk device according to claim 6,

The first conductive member includes an extending portion formed in a state in which a front side end portion of the planar portion of the first conductive member extends toward the third conductive member,

The third conductive member can contact the extension portion of the first conductive member, and biases the extension portion in the contact direction when the third conductive member contacts the extension portion.

A disk device characterized by the above.

[8] The disk device according to claim 6 or claim 7,

The flat surface portion of the first conductive member and the flat surface portion of the second conductive member are formed in substantially the same shape. A disk device characterized by the above.

[9] The disk device according to any one of claims 1 and 8, wherein

The conductive member is formed of a conductive plate member.

A disk device characterized by the above.

[10] The disk device according to any one of claims 1 to 9 and claim 9,

The opening is formed in a longitudinal shape,

A plurality of the conductive members are provided along the longitudinal direction of the opening.

A disk device characterized by the above.

[11] The disk device according to any one of claims 1 to 10,

The disc is an optical disc;

A light emitting element for irradiating the recording surface of the optical disc with laser light based on a supplied laser driving current;

The high frequency generator superimposes a high frequency signal on the laser drive current.