JP2005108369A - Optical disk device, and portable information processor having device mounted thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device more effectively preventing malfunction caused by a noise electric wave from an external portable telephone, and also to provide a portable information processor having the device mounted thereon. <P>SOLUTION: The optical disk device is provided with a casing 10, and a tray 20 inserted into/ejected from the casing through its opening 12, and a part of the tray is provided with a disk motor 50 for rotary-driving an optical disk, and an optical pickup 30 for recording/reproducing information on the optical disk by using an optical beam. On the other hand, the casing is provided with a processing circuit board 40 for processing a signal from an optical pickup mounted on the tray, flexible wiring sheets 100 and 200 are bent and arranged in a part thereof, electromagnetic wave absorbing members 300 and 400 are arranged in positions near bent parts 110 and 210 thereof, and accordingly the vertical resonance of an electromagnetic wave is reduced in the casing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus capable of recording / reproducing information on an optical disc, which is an optical information recording medium such as a CD-R or CD-RW, using, for example, a semiconductor laser diode. The present invention relates to a portable information processing terminal device.

  2. Description of the Related Art Conventionally, in an optical disc apparatus, a laser diode is used as a light emitting source, and in addition to an optical disc such as a read-only CD-ROM, further, for example, a CD-R (CD-Recordable) or a CD-RW (CD-ReWritable) It is widely used in recording / reproducing music and video as information recording and reproducing information on a recordable optical disc such as a DVD-RAM (Digital Versatile Disc-Random Access Memory). Optical disk devices are also widely used as information recording devices (storage devices) in information processing terminals represented by personal computers as the amount of recordable information increases and the processing speed increases.

  In addition, such an optical disc apparatus is remarkably miniaturized, and can be mounted on such a portable information processing terminal, particularly with the spread of miniaturization of personal computers (for example, notebook-size personal computers). There is a strong demand for light / thin optical disc devices and they are in practical use.

  On the other hand, in the above optical disk apparatus, the usage pattern has changed greatly along with its light weight / thinning, and in particular, with the rapid spread in recent years, a portable personal computer is operated while using a cellular phone. There are many cases. That is, the optical disk device is often used in the vicinity of a device that transmits radio waves. However, 940 MHz or 1.44 GHz radio waves (electromagnetic waves) transmitted from the mobile phone or the like are used in the optical disk device. For example, if this is a jamming radio wave and enters a wiring in the apparatus, it may cause an abnormal operation such as a read error or a seek error.

  By the way, in such a disk drive device, a dust-proof cap that reliably prevents dust from adhering to the circuit board, has excellent shielding properties against electromagnetic noise, and is prevented from being charged by static electricity is disclosed in the following patent document. 1 is already known.

JP-A-10-1225054

  In the above-described prior art, that is, the dust-proof cap described in the above-mentioned Patent Document 1, that is, a device that causes a malfunction by the metal material having conductivity, however, it is transmitted from a mobile phone or the like as described above. There was a problem that sufficient effects could not be obtained for radio waves (electromagnetic waves) of 940 MHz and 1.44 GHz.

  By the way, according to various experiments, the present inventors, in particular, as described above, in a lightweight / thin optical disc apparatus that can be mounted on a portable information processing terminal, due to its structure, the following The fact has been discovered, and the present invention has been made based on this discovery.

  That is, in the lightweight / thin optical disc apparatus that can be mounted on the above-described portable information processing terminal, as a structure, a so-called tray slides inside a plate-shaped housing (cover) by a feeding mechanism, A structure that is discharged to the outside from the opening on the front surface of the housing or inserted into the inside is widely adopted. This tray is equipped with an optical pickup for recording / reproducing information with a laser beam on a rotating optical disk, as well as a disk motor for driving the optical disk mounted on its rotating shaft. On the other hand, the inside of the cover is provided with a signal processing unit for processing a signal from the optical pickup or generating a control signal for controlling the signal, and these positions are mutually located. Wiring between the cover and the tray is movable by using a flexible wiring sheet (FPC: Flexible Printed Circuit; so-called flexible). Further, since the optical pickup can move in the radial direction of the optical disc, the wiring sheet having the above flexibility is used for the wiring.

  By the way, the above-described disturbing radio waves (electromagnetic waves) incident on the optical disk device have directionality. Therefore, for example, when a radio wave generator such as a cellular phone is brought close to the opening (front vessel) of the optical disc device, that is, when a substantially vertical radio wave is incident on the optical disc device, The portion is reflected on the inner surface of the casing (cover) that forms the outer shape of the optical disk device. However, the reflection does not eliminate the electromagnetic wave, but only changes the traveling direction thereof. Further, since the housing of the optical disk device is generally made of metal such as iron or aluminum, depending on the frequency of the incident radio wave, it is reflected by the housing and resonates to amplify the radio wave intensity. Further, it has been found that the mixing of noise due to this resonance phenomenon (noise resonance) is remarkable in the wiring sheet having flexibility, particularly in the curved portion. That is, the portion that is approximately parallel to the resonating radio wave is most easily affected. This seems to be caused by the fact that the direction of the wiring in the bending portion of the flexible wiring sheet matches the thickness direction of the casing (cover), that is, the resonance of the radio wave. .

  Therefore, in the present invention, based on the discovery of the present inventors as described above, an optical disk device that more effectively prevents malfunction due to radio waves entering the inside of the device from the outside, particularly noise radio waves from a mobile phone, It is another object of the present invention to provide a portable information processing apparatus equipped with such an optical disk device.

  According to the present invention, in order to achieve the above-described object, first, a substantially plate-shaped housing having an opening in a part thereof, and the housing housed in the housing and inserted through the opening. The disc-shaped optical information recording unit is equipped with a disc motor that can be rotated by mounting a disc-shaped optical information recording medium on a rotating shaft of a part of the tray. The medium includes an optical pickup that records and / or reproduces information using a light beam, and on the other hand, a signal from the optical pickup mounted on the tray is processed in a part of the casing In an optical disc apparatus provided with a signal processing unit, a flexible wiring sheet is curvedly disposed at least at a part thereof, and an electromagnetic wave absorbing member is disposed at a position close to the curved portion of the flexible wiring sheet. Arranged optical disk device It is provided.

  According to the present invention, in the optical disk device described above, the curved portion of the flexible wiring sheet has a portion extending in a substantially vertical direction with respect to the upper and lower surfaces of the substantially plate-shaped housing. Furthermore, the flexible wiring sheet includes the signal processing unit disposed inside the casing, and the tray that can be inserted / extracted through the opening of the casing. It is a flexible wiring sheet that performs wiring between the two, or a flexible wiring sheet that performs wiring with an optical pickup arranged so as to be movable with respect to the tray. In addition, it is preferable that the electromagnetic wave absorbing member has a sheet shape and is attached to a position close to the curved portion.

  According to the present invention, the optical disc device described above may be a device attached to a part of a portable information processing device, or a portable device in which the optical disc device described above is mounted. An information processing apparatus may be used.

  That is, according to the above-described optical disc apparatus of the present invention, an optical disc apparatus that more effectively prevents malfunction caused by radio waves entering the inside of the apparatus from the outside, particularly noise radio waves from a mobile phone, is provided. An excellent effect is achieved that it is possible to provide a portable information processing apparatus equipped with an optical disk device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 attached herewith is a perspective view showing an entire configuration of an optical disc apparatus according to an embodiment of the present invention. In addition, in this figure, in order to show the internal structure, the state which removed the top cover and was seen from upper direction is shown.

  In this figure, together with a top cover (reference numeral 11 ′ in FIG. 3) (not shown), the bottom cover 11 constituting a part of a substantially plate-shaped housing has an opening on the front surface (left side in the figure). 12 is formed, and a so-called tray 20 that is a member for mounting a disk-shaped optical information recording medium such as a CD is accommodated in the housing 10 on the upper surface thereof. ing. The tray 20 is discharged from the opening 12 to the outside of the housing 10 by a feed mechanism (not shown), or can be inserted into the inside thereof. Further, as shown in the figure, the tray 20 has a concave portion 21 for mounting the CD on the upper surface side thereof, and a disk motor described below at a substantially central portion thereof. A turntable 22 attached to the tip of the rotating shaft is provided. That is, when an optical disc such as a CD is mounted on the optical disc apparatus, the tray 20 is pulled out of the housing 10 by, for example, pressing a button (not shown), and a circular shape formed inside the optical disc. Is inserted into the outer periphery of the optical disc, and then the optical disc is inserted into the housing 10 together with the tray 20.

  In addition, the tray 20 is irradiated with a laser beam on an optical disc mounted on the turntable 22 and rotated at a high speed, and information is written on the information recording surface, or is written by reflected light. A so-called optical pickup 30 which is a member for reproducing information is attached so as to be freely movable in the radial direction of the optical disc (indicated by an arrow in the figure). Reference numeral 23 in the figure denotes a so-called front vessel that covers the opening 12 on the front surface of the casing 10.

  On the other hand, a space in which the tray 20 can be stored is formed on the housing 10 side, and the periphery of the storage space is detected by, for example, an optical pickup 30 disposed on the tray 20 side. A so-called processing circuit board 40 for processing various signals converted into electrical signals is mounted. Further, an interface 41 for connecting the optical disk device to an external device such as a personal computer is provided on the rear surface side of the housing 10, and is detected from the optical disk by the optical pickup 30 and is A signal (information) processed by the processing circuit board 40 is transmitted to the outside, or a signal (information) transmitted from the outside is written to the optical disc.

  In the portable small and lightweight optical disk apparatus having the above-described structure, the disk 10 is slidable with respect to the casing 10 and can be inserted / extracted. For the purpose of realizing electrical connection between the tray 20 on which the optical pickup 30 and the like are mounted and the housing 10, a flexible wiring board called a “U” -shaped flexible board is used. A sheet (FPC) 100 is used. That is, as shown in the figure, one end of the “U” -shaped flexible board 100 is connected to a terminal connection portion 42 formed on the processing circuit board 40, and the lower surface thereof is bonded with an adhesive or the like. 10 is attached to and fixed to the inner surface of the bottom cover 1 that constitutes 10.

  The other of the above-mentioned “U” -shaped flexible body 100 is curved in the opposite direction without fixing its lower surface, and its end is connected to a terminal connection portion (not shown) provided on the tray 20 side. Connected. That is, as shown by the broken line in the figure, the “U” -shaped flexure 100 moves the position of the curved portion 110 according to the position accompanying the insertion / ejection of the tray 20, so This ensures electrical connection between the casing 10 and the tray 20 that change.

  Next, FIG. 2 attached herewith shows a perspective view of the optical disc apparatus having the entire structure described above, particularly when the tray 20 is viewed from below. Also in this figure, the tray 20 is shown with the metal under cover 25 attached to the lower surface thereof removed, in order to show its internal structure.

  As is apparent from FIG. 2, a disk motor 50 for rotating the mounted optical disk is disposed at the approximate center of the tray 20 as described above. Further, the optical pickup 30 described above is further provided. A feed mechanism for freely moving the optical disk in the radial direction of the optical disk is mounted. In this figure, one of the slide shafts 33 constituting a part of the feeding mechanism of the optical pickup 30 is shown. However, not only this feeding mechanism, but also the optical pickup 30, for example, It goes without saying that a motor for generating a moving force, a control device therefor (refer to motor drive board 35, see FIG. 3), and the like are included.

  Also in the structure of the tray 20 shown in FIG. 2, in order to realize electrical connection with the optical pickup 30 whose position can be freely moved with respect to the tray 20, too, substantially “ A flexible wiring board sheet (FPC) 200 called U-shaped flexible is used. That is, as shown in the figure, one end portion of the “U” -shaped flexible board 200 is connected to a terminal connection portion (not shown) formed on the tray 20, and the lower surface of the tray 20 is bonded with an adhesive or the like. The other side is fixed by being attached to the back surface, and the other side is curved in the opposite direction without fixing the lower surface, and the end is connected to a terminal connection portion (not shown) provided on the optical pickup 30 side. Connected. That is, as shown by the broken line in the figure, the “U” -shaped flexible board 200 moves along the curved portion 210 according to the position where the optical pickup 30 moves, so that the mutual position changes. The electrical connection between the optical pickup 30 and the tray 20 is ensured.

  Note that the portable small and lightweight optical disc apparatus as described above is a part of a portable information processing apparatus 500 represented by a portable personal computer or the like (see FIG. 4). (In the drawing, the built-in optical disk device is indicated by the housing 10 and the vessel 23), and is used as the information recording / reproducing device. . In the usage mode, for example, it is often used in the vicinity of a device such as a mobile phone that transmits radio waves. In that case, 940 MHz or 1.44 GHz radio waves (electromagnetic waves) transmitted from the mobile phone or the like are used. Passes through the becel 23 and enters the inside of the optical disc apparatus, and becomes an interference wave. That is, when this is mixed in the wiring in the apparatus, it may cause an abnormal operation such as a read error or a seek error.

  By the way, in the portable small and light optical disc apparatus as described above, the above-described disturbing radio wave (electromagnetic wave) has directionality as shown in FIG. Therefore, for example, when a radio wave generator such as a cellular phone is brought close to the opening (front vessel) 23 of the optical disk device, that is, when a substantially vertical radio wave is incident on the optical disk device, many This portion is reflected on the inner surfaces of the bottom cover 11 and the top cover 11 ′ constituting the casing 10 constituting the outer shape of the optical disc apparatus. However, this reflection does not cause the electromagnetic wave to disappear, but only changes its traveling direction. Further, since the housing 10 of the optical disk device is generally made of a metal such as iron or aluminum, depending on the frequency of the incident radio wave, it is reflected by the housing and causes resonance, thereby amplifying the radio wave intensity. .

  As described above, the mixing of noise due to this resonance phenomenon (noise resonance) is remarkable in the wiring sheet having flexibility, particularly in the curved portion. That is, in the above-described “U” -shaped flexible body 100 on the housing 10 side, the curved portion 210 is also formed at the position of the curved portion 110 and also in the above-described “U” -shaped flexible body 200 on the tray 20 side. In the position of. Such a phenomenon seems to be caused by the fact that the direction of the wiring coincides with the resonance direction of the radio wave in the flexible curved portion as the wiring sheet.

  Therefore, in the present invention, in order to prevent the above-described problems, that is, abnormal operations such as read errors and seek errors caused by penetration of radio waves (electromagnetic waves) transmitted from a mobile phone or the like into the optical disc apparatus, The portion whose direction coincides with the direction in which resonance occurs in the housing of the apparatus, that is, the curved portion 110 of the “U” -shaped flex 100 on the housing 10 side, and further the “U” on the tray 20 side. In order to reduce the resonance of radio waves (electromagnetic waves) in the vicinity of the curved portion 210 of the "-" shaped flex 200, an electromagnetic wave absorbing member is disposed.

  Here, as an example of the electromagnetic wave absorbing member, for example, a metal foil such as copper is attached to a sheet-like member such as polyester. And the sheet | seat which is this electromagnetic wave absorption member is cut out to the extent which covers the curved part, and it adheres and fixes using an adhesive material etc. More specifically, in the case of the “U” -shaped flexible body 100 on the housing 10 side, as shown by the reference numeral 300 in FIG. 1, the tray 20 is inserted into the housing 10. An electromagnetic wave absorbing sheet is attached to a portion where the curved portion 110 is located.

  This is because the optical disk apparatus normally performs the recording / reproducing operation only in a state where the tray 20 is inserted into the housing 10, and thus the “U” -shaped flexible film 100 in which the curved portion 110 is generated in that state. This is because it is sufficient to arrange the absorbent sheet 300 only at the position. Moreover, in the example of FIG. 1, the example in which the absorbent sheet 300 is provided only on the inner surface side of the bottom cover 11 among the bottom cover 11 and the top cover 11 ′ constituting the casing 10 is shown. The present invention is not limited to this. That is, it may be attached to the inner surface side of the top cover 11 'on the opposite side. In this case, although the cost due to the attachment increases, a larger electromagnetic wave absorbing effect can be expected.

  2 is attached between the optical pickup 30 and the tray 20, when the sheet as the electromagnetic wave absorbing member is attached to the tray 20 side shown in FIG. The “U” -shaped flex 200 is cut out to a size that covers the curved portion 210 and is attached and fixed using an adhesive or the like. More specifically, as indicated by reference numeral 400 in FIG. 2, the entire range in which the optical pickup 30 moves, that is, the curved portion 210 that moves when moving from the outermost periphery to the innermost periphery is sufficiently provided. Attach an electromagnetic wave absorbing sheet to cover. This is because the optical pickup 30 normally moves freely in the radial direction of the optical disc during the recording / reproducing operation of the optical disc apparatus. In the example of FIG. 2, the electromagnetic wave absorbing sheet 400 is attached to the inner surface of the under cover 25 attached to the lower portion of the tray 20 after the “U” -shaped flex 200 is attached.

It is the perspective view seen from the upper part for showing the whole optical disk device composition which becomes one embodiment of the present invention. In the optical disk apparatus according to the present invention, in particular, it is a perspective view from below showing the configuration of the tray portion. It is a figure for demonstrating the behavior of the jamming electric wave (electromagnetic wave) in the optical disk device according to the present invention. It is a figure which shows the example which incorporated the optical disk device which becomes the said invention in the notebook type personal computer which is a portable information processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Housing | casing 12 ... Opening part 20 ... Tray 22 ... Turntable 23 ... Front bezel 30 ... Disc motor 40 ... Processing circuit board 100, 200 ... "U" -shaped flexible (FPC)
110, 210 ... curved portion 300, 400 ... electromagnetic wave absorbing sheet.

Claims (7)

A substantially plate-shaped housing having an opening in a part thereof; a tray housed in the housing and insertable / dischargeable through the opening; and one of the trays The disk-shaped optical information recording medium is mounted on the rotating shaft, and a disk motor that can be rotated is used for recording and / or reproducing information using a light beam on the disk-shaped optical information recording medium. An optical pickup for performing, on the other hand, in a part of the housing, in an optical disc apparatus provided with a signal processing unit for processing a signal from the optical pickup mounted on the tray,
An optical disk apparatus comprising: a flexible wiring sheet curved at least at a part thereof; and an electromagnetic wave absorbing member disposed at a position close to the curved portion of the flexible wiring sheet.   2. The optical disk device according to claim 1, wherein the curved portion of the flexible wiring sheet has a portion extending in a substantially vertical direction with respect to the upper and lower surfaces of the substantially plate-shaped casing. An optical disk device.   3. The optical disc apparatus according to claim 1, wherein the flexible wiring sheet can be inserted / extracted through the signal processing unit disposed inside the casing and the opening of the casing. An optical disc device characterized by being a flexible wiring sheet for wiring between the tray.   3. The optical disk apparatus according to claim 1, wherein the flexible wiring sheet is a flexible wiring sheet that performs wiring with an optical pickup that is movably disposed with respect to the tray. An optical disc device characterized.   2. The optical disc apparatus according to claim 1, wherein the electromagnetic wave absorbing member is in a sheet shape and is attached to a position close to the curved portion.   6. The optical disk apparatus according to claim 1, wherein the optical disk apparatus is an apparatus attached to a part of a portable information processing apparatus.   A portable information processing apparatus in which the optical disk device according to any one of claims 1 to 5 is mounted.

Images