JP2010118124A - Optical pickup device and information recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device that properly suppresses an influence of unwanted radiation and prevents vibration. <P>SOLUTION: The optical pickup device 1 includes: an optical pickup 10 which is provided with a casing 17 formed of non-conductive members and a plurality of parts 12, 15 which are provided on the casing 17, (i) formed of conductive members, (ii) each made conductive, and (iii) each grounded; and a traverse device 20 provided with a transfer means 24 transferring the optical pickup 10 and shaft members 22, 23 guiding transfer of the optical pickup 10. The optical pickup 10 is provided with a biasing means 15 biasing the shaft members 22, 23 in the direction orthogonal to the shaft member and is connected to the shaft members through the biasing means 15 and the casings 13, 14, 17. The optical pickup 10 and the traverse device 20 are insulated electrically. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technical field of an optical pickup apparatus and an information recording / reproducing apparatus that record or reproduce data on an optical disc by irradiating laser light.

  The optical pickup device typically includes an optical pickup including a semiconductor laser and a traverse mechanism that moves the optical pickup in the radial direction of the optical disk. A typical optical pickup is configured by mounting a plurality of parts formed of a conductive member such as a metallic circuit or a heat dissipation member in a pickup body formed of a non-conductive resin or the like. Is done.

  At this time, when the conductive component mounted on the pickup body is not electrically grounded, there is a technical problem that unnecessary radiation is generated due to a current accompanying driving of a semiconductor laser or the like. More specifically, when a plurality of conductive parts serve as a loop antenna, unnecessary radiation corresponding to a high-frequency superimposed current caused by a clock signal or the like generated when the semiconductor laser is driven is generated.

  Such unnecessary radiation may lead to deterioration in signal quality or malfunction in other electronic components, and is subject to strict regulations.

  Conventionally, in order to suppress such unwanted radiation, measures have been taken to cause conductive parts provided in an optical pickup to be brought into conduction by being brought into contact with each other and fastened to each other and to ground the whole.

  However, in general, in an optical pickup that is connected to a traverse mechanism that is not grounded, a plurality of conductive parts and a traverse mechanism in the optical pickup are provided by interposing a conductive member at a connection portion with the traverse mechanism. May become conductive.

  Non-Patent Document 1 discloses a mounting structure that electrically insulates a conductive optical pickup and a shaft member that is a connecting part of the conductive traverse mechanism by using a member having no conductivity. Is disclosed. According to such an attachment structure, it is said that the influence of electromagnetic noise from the outside can be suitably suppressed.

  Patent Document 1 discloses an optical pickup device that suppresses unnecessary radiation by electrically insulating a pickup body and a heat radiating member mounted on the pickup body. According to such a structure, it is said that generation | occurrence | production of the unnecessary radiation as mentioned above can be suppressed suitably.

Japanese Utility Model Publication No. 6-52012 JP-A-2005-190501

  Generally, the traverse mechanism includes a shaft member (for example, a main shaft and a sub shaft) for guiding the transfer of the optical pickup. And an optical pick-up is hold | maintained by a traverse mechanism by connecting with this shaft member, and is transferred.

  By the way, the optical pickup needs to be precisely adjusted in position and angle with respect to the optical disc when recording and reproducing data. However, the optical pickup may cause an error in data recording and reproduction even when a coupling portion with the sub shaft is vibrated even by a small vibration or impact. In order to suppress such vibration, there is an optical pickup provided with a biasing leaf spring or the like at a portion connected to the auxiliary shaft.

  For example, Patent Document 1 described above does not include means for suppressing the signal of the optical pickup such as the biasing spring. For this reason, the accuracy of position and angle adjustment of the optical pickup is reduced due to the irradiation of the laser beam, so that the accuracy of recording and reproduction cannot be reduced, and the light scribing technology cannot be supported. There is a problem.

  However, there is an example in which the optical pickup and the traverse mechanism are conducted through such an urging spring.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide an optical pickup apparatus and an information recording / reproducing apparatus that can suppress unnecessary radiation caused by conduction between the optical pickup and a traverse mechanism. To do.

  In order to solve the above-described problem, an optical pickup device according to claim 1 is configured to emit laser light to a casing formed of a non-conductive member, a plurality of components provided on the casing, and an information recording medium. An optical pickup including a semiconductor laser to be irradiated; a traverse device including a transport unit that transports the optical pickup in a radial direction of the information recording medium; and a shaft member that guides the transport of the optical pickup; (i) as one of the plurality of parts, provided with a biasing means for biasing the shaft member in a direction orthogonal to the shaft member, and (ii) the biasing means and the housing via the housing The plurality of components connected to the shaft member are (i) formed of a conductive member, (ii) conductive, and (iii) grounded, and the optical pickup and the traverse device Electric It is electrically insulated.

  In order to solve the above-described problem, an optical pickup device according to claim 5 emits laser light to a housing formed of a non-conductive member, a plurality of components provided on the housing, and an information recording medium. An optical pickup including a semiconductor laser for irradiating; and a traverse device including a transfer means for transferring the optical pickup in a radial direction of the information recording medium, wherein the plurality of parts are formed of (i) a conductive member. , (Ii) each conducting, and (iii) ground fault, and a part of the plurality of parts that can contact the traverse apparatus is in contact with the traverse apparatus via a non-conductive member.

  In order to solve the above-described problem, an optical pickup device according to claim 7 is configured to emit laser light to a housing formed of a non-conductive member, a plurality of components provided on the housing, and an information recording medium. An optical pickup including a semiconductor laser to be irradiated; and a traverse apparatus including a transfer unit configured to transfer the optical pickup in a radial direction of the information recording medium, and one or more of the plurality of parts not contacting the traverse apparatus The component is formed of (i) a conductive member, (ii) conductive and (iii) grounded, and the component that can contact the traverse device among the plurality of components is non-conductive. It is formed from a member.

  In order to solve the above-described problem, an information recording / reproducing apparatus according to an eighth aspect includes the optical pickup apparatus according to any one of the first to seventh aspects.

  In the first embodiment of the optical pickup device of the present invention, a semiconductor laser that irradiates laser light to a housing formed of a non-conductive member, a plurality of components provided on the housing, and an information recording medium is provided. An optical pickup, and a traverse device including a transport unit that transports the optical pickup in a radial direction of the information recording medium and a shaft member that guides the transport of the optical pickup. As one of the parts, it is provided with urging means for urging the shaft member in a direction orthogonal to the shaft member, and (ii) connected to the shaft member via the urging means and the housing. The plurality of components are (i) formed of a conductive member, (ii) each conductive, and (iii) grounded, and the optical pickup and the traverse device are electrically insulated. The Yes.

  According to the first embodiment of the optical pickup device of the present invention, an optical pickup in which a plurality of components such as a semiconductor laser are mounted on a non-conductive casing, a transfer means for transferring the optical pickup, and an optical And a traverse device including a shaft member for guiding the transfer of the pickup.

  Here, the plurality of components mounted on the housing are each formed of a conductive member, and are electrically connected to each other by contact or fastening, and are grounded. Examples of such a plurality of components include a semiconductor laser, a heat sink, and a laser driving circuit mounted on the housing of the optical pickup. Such a plurality of parts are brought into conduction by being brought into contact with each other or being fastened. As a result, a so-called loop antenna-like circuit is formed, and typically a current flows in the loop antenna-like circuit, which may contribute to unnecessary radiation.

  Therefore, according to the first embodiment of the optical pickup device of the present invention, the plurality of components that are electrically connected to each other are grounded by being electrically connected to an external ground terminal, for example. According to such a configuration, no current flows through the loop antenna-like circuit described above, and unnecessary radiation can be suitably suppressed.

  Incidentally, as described above, the optical pickup and the transfer traverse device are connected via the shaft member. Here, when a conductive member is interposed between the connecting portions of the two, there is a possibility that a noise current that should originally be grounded flows from the optical pickup side to a traverse device that is generally not grounded. At this time, the conductive member constituting the traverse apparatus forms a loop antenna-like circuit, which may be a cause of further unnecessary radiation.

  Typically, the traverse apparatus realizes transfer of the optical pickup by connecting a transfer member that drives on a transfer shaft driven by a transfer motor and an optical pickup. Typically, the transfer axis described above is an axis parallel to the radial direction of the information recording medium, which is an optical disk mounted on the optical pickup device. For this reason, the optical pickup can be moved along the radial direction of the information recording medium by moving the transfer member along the transfer axis as the transfer motor is driven.

  Further, the traverse device includes two shaft members (that is, a main shaft and a sub shaft) parallel to the transport shaft in order to guide the transport of the optical pickup. The optical pickup can move in a manner in which vibration is not easily generated by holding the main shaft and the sub shaft through a support portion provided in the housing.

  Further, in order to further suppress vibrations in the optical pickup, according to the first embodiment of the optical pickup device of the present invention, the optical pickup device is connected to the optical pickup and biased in a direction orthogonal to the axial direction with respect to the main shaft or the sub shaft. Biasing means is provided. According to such an urging means, the main shaft and the sub-shaft are provided on the relatively weakly supported side, and the corresponding shaft member is urged to the support portion of the housing, thereby suppressing the room for vibration. I can do it. Hereinafter, for convenience, an axis that is relatively weakly supported with the optical pickup is referred to as a secondary axis. Therefore, unless otherwise specified, the biasing means is provided to bias the countershaft.

  As described above, according to the first embodiment of the optical pickup device of the present invention, the optical pickup and the traverse device are configured to be in contact with each other via the transfer member, the main shaft, the sub shaft, and the urging means.

  In many cases, the urging means in contact with the countershaft is electrically connected to the components (that is, the countershaft) constituting the traverse device. As described above, since the traverse device is not grounded, when the urging means and the traverse device are conducted, the traverse device serves as a loop antenna and may deteriorate unnecessary radiation.

  Further, even when the biasing means and the traverse device are in a conductive state, for example, a reliable conductive state by fastening is rarely maintained. Even when the biasing means and the traverse device are in contact with each other, the state of the conduction state changes from moment to moment due to vibration caused by the drive of the optical pickup or the like, and sometimes the conduction state is canceled. Sometimes. Due to such an unstable conduction state, there is a possibility that unwanted radiation may be irregularly deteriorated, such as instantaneous peak noise.

  Therefore, according to the first embodiment of the optical pickup device of the present invention, the optical pickup and the traverse device are configured to be electrically insulated. At this time, since the transfer member and the main shaft described above are connected to the optical pickup via a pickup body formed of a non-conductive member, it is relatively insignificant to perform insulation again. According to the embodiment of the present invention, in particular, electrical insulation between the optical pickup and the traverse device is achieved by electrically insulating the biasing means and the auxiliary shaft, which are often formed by a conductive member. Insulation is achieved.

  By configuring in this way, while enjoying the remarkable effect of suppressing the vibration by the urging means, it is possible to suitably suppress the conduction state between the optical pickup and the traverse device via the urging means.

  Insulation may be performed by paying attention to a portion where the urging means and the auxiliary shaft are in contact with each other, and insulation between the optical pickup and the traverse device can be realized relatively easily.

  As a result, it is possible to favorably maintain the ground fault state in the optical pickup, and it is possible to favorably suppress unnecessary radiation caused by conducting with the traverse device.

  In another aspect of the first embodiment of the optical pickup device of the present invention, the biasing means and the shaft member are in contact with each other via a non-conductive member.

  According to this aspect, the biasing means is in contact with the shaft member via the non-conductive member (in other words, biased). Therefore, for example, even if the biasing spring and the shaft member are made of a conductive member based on structural requirements such as strength and processing method, a non-conductive member is interposed between them. Preferably, both can be electrically insulated.

  At this time, the non-conductive member only needs to be provided so that at least the urging means and the shaft member do not contact each other without the non-conductive member interposed therebetween.

  With this configuration, it is possible to favorably maintain the ground fault state in the optical pickup, and it is possible to favorably suppress unnecessary radiation resulting from conducting with the traverse device.

  In another aspect of the first embodiment of the optical pickup device of the present invention, a non-conductive member is formed on the biasing means by at least one of painting, insert molding, and vapor deposition.

  According to this aspect, since the surface of the urging means is covered with the non-conductive member, the urging means contacts (in other words, urges) the shaft member via the non-conductive member. Therefore, for example, based on structural requirements such as strength and processing method, even if the biasing spring and the shaft member are made of a conductive member, the surface of the biasing means is covered with a non-conductive member. Thus, both can be electrically insulated. Also, according to means such as painting, insert molding and vapor deposition, the surface of the urging means can be covered with a non-conductive member relatively easily, so that the production of such urging means is more efficient and There is also an advantage that it can be implemented at low cost.

  Moreover, in this aspect, the above-mentioned effect can be suitably exhibited as long as at least only a portion in contact with the shaft member is covered with the non-conductive member in the surface of the urging means. That is, it is sufficient that at least the biasing means and the shaft member are provided so as not to contact each other without a non-conductive member.

  With this configuration, it is possible to favorably maintain the ground fault state in the optical pickup, and it is possible to favorably suppress unnecessary radiation resulting from conducting with the traverse device.

  Further, as described above, in the aspect in which the urging means and the shaft member are in contact with each other via a non-conductive member, the urging means and the shaft member are non-conductive resin. You may be comprised so that it may contact via.

  At this time, by using a resin that is easy to mold, it is possible to suitably maintain the ground fault state in the optical pickup, and it is possible to suitably suppress unnecessary radiation caused by conducting with the traverse device. Can be enjoyed relatively easily.

  In a second embodiment of the optical pickup device of the present invention, a semiconductor laser that irradiates laser light to a housing formed of a non-conductive member, a plurality of components provided on the housing, and an information recording medium is provided. An optical pickup, and a traverse device including a transfer means for transferring the optical pickup in the radial direction of the information recording medium, wherein the plurality of parts are formed of (i) a conductive member, and (ii) each A part that is electrically connected and (iii) is grounded and can come into contact with the traverse device among the plurality of parts is in contact with the traverse device through a non-conductive member.

  According to the second embodiment of the optical pickup device of the present invention, as in the optical pickup device according to the first embodiment described above, a plurality of components such as a semiconductor laser are mounted on a non-conductive casing. An optical pickup and a traverse device including a transfer means for transferring the optical pickup are provided. Also in the optical pickup device according to the second embodiment, a plurality of components that are electrically connected to each other are grounded by being electrically connected to an external ground terminal, for example. The current no longer flows in the circuit, and unnecessary radiation can be suitably suppressed.

  Especially in 2nd Embodiment, the components which can be in contact with a traverse apparatus among several components are in contact with the traverse apparatus via a nonelectroconductive member. Therefore, electrical insulation is realized between the optical pickup and the traverse device. Thereby, it is possible to suitably maintain the ground fault state in the optical pickup, and it is possible to suitably suppress unnecessary radiation caused by conducting with the traverse device.

  Incidentally, in response to the various aspects adopted by the optical pickup device according to the first embodiment described above, the optical pickup apparatus according to the second embodiment may adopt various aspects.

  In one aspect of the second embodiment of the optical pickup device of the present invention, the traverse device includes a shaft member that guides the transfer of the optical pickup, and can contact the traverse device among the plurality of components. The component is a biasing unit that biases the shaft member in a direction orthogonal to the shaft member.

  According to this aspect, electrical insulation between the urging means that contacts the traverse device (more specifically, the shaft member included in the traverse device) and the traverse device is realized. Therefore, as in the optical pickup device according to the first embodiment described above, while enjoying the remarkable effect of suppressing the vibration by the urging means, the optical pickup and the traverse device by way of the urging means are used. Can be suitably suppressed.

  In a third embodiment of the optical pickup device of the present invention, a semiconductor laser that irradiates laser light onto a housing formed of a non-conductive member, a plurality of components provided on the housing, and an information recording medium is provided. An optical pickup, and a traverse device including a transport unit that transports the optical pickup in a radial direction of the information recording medium, and one or a plurality of components that are not in contact with the traverse device among the plurality of components are (i ) Formed from a conductive member, (ii) each conductive, and (iii) grounded, and the component that can contact the traverse device among the plurality of components is formed from a non-conductive member. Yes.

  According to the third embodiment of the optical pickup device of the present invention, as in the optical pickup device according to the first embodiment described above, a plurality of components such as a semiconductor laser are mounted on a non-conductive casing. An optical pickup and a traverse device including a transfer means for transferring the optical pickup are provided. Also in the optical pickup device according to the third embodiment, a plurality of components that are electrically connected to each other (particularly, a plurality of components that do not contact the traverse device) are electrically connected to an external ground terminal, for example. Since it is grounded, no current flows through the loop antenna-like circuit described above, and unnecessary radiation can be suitably suppressed.

  Especially in 3rd Embodiment, the components which can contact a traverse apparatus among several components are formed from the nonelectroconductive member. Therefore, electrical insulation is realized between the optical pickup and the traverse device. Thereby, it is possible to suitably maintain the ground fault state in the optical pickup, and it is possible to suitably suppress unnecessary radiation caused by conducting with the traverse device.

  As an example of such a non-conductive member, engineering plastics such as PPS (Polyphenylenesulfide) may be used.

  Incidentally, in response to the various aspects adopted by the optical pickup device according to the first or second embodiment described above, the optical pickup apparatus according to the third embodiment may adopt various aspects.

  The embodiment according to the information recording / reproducing apparatus of the present invention includes the first, second, or third embodiment (including various aspects thereof) according to the above-described optical pickup apparatus of the present invention.

  According to the embodiment of the information recording / reproducing apparatus of the present invention, the same effects as the various effects that the first, second, or third embodiment of the above-described optical pickup apparatus of the present invention can enjoy can be enjoyed. However, suitable data recording and reproduction can be performed.

  Incidentally, in response to the various aspects of the first, second, or third embodiment of the optical pickup apparatus of the present invention described above, the embodiment of the information recording / reproducing apparatus of the present invention can also adopt various aspects. is there.

  As described above, according to the first embodiment of the optical pickup device of the present invention, the optical pickup including the housing, the plurality of components, and the semiconductor laser, and the traverse device including the biasing means and the shaft member are provided. The optical pickup and the traverse device are electrically insulated. According to the second embodiment of the optical pickup of the present invention, a component that includes an optical pickup including a housing, a plurality of components, and a semiconductor laser, and a traverse device that includes a transfer unit, and can be in contact with the traverse device among the plurality of components. Is in contact with the traverse device via a non-conductive member. According to the third embodiment of the optical pickup of the present invention, the optical pickup including the housing, the plurality of components, and the semiconductor laser, and the traverse device including the transfer unit, the component that can contact the traverse device among the plurality of components. Is formed from a non-conductive member. The information recording / reproducing apparatus according to the present invention includes the first, second, or third embodiment according to the above-described optical pickup apparatus of the present invention. Accordingly, unnecessary radiation can be suitably suppressed when data is recorded or reproduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(1) Basic Configuration First, the basic operation of the optical pickup device 1 will be described with reference to FIG. 1 while explaining the basic configuration of the optical pickup device 1 according to the embodiment of the present invention. FIG. 1 is a top view and a side view showing a basic configuration of an optical pickup device 1 according to an embodiment of the present invention. Note that the optical pickup device 1 typically includes an optical pickup 10 for irradiating laser light and a traverse mechanism 20 that moves the optical pickup 10 in the radial direction of the optical disc 100.

  First, in FIG. 1, an optical pickup 10 includes, in a pickup body 17, a laser diode (LD) (not shown), a laser diode driver (LDD) (not shown), an objective lens 11, an objective lens driving device 12, a main shaft. A support member 13, a countershaft support member 14, and a multi-axis biasing spring 15 are provided.

  The LD is connected to the LDD and is held inside the pickup body 17 in an optically suitable manner. The LDD controls the mode of laser light irradiation by the LD. At this time, the objective lens driving device 12 is driven by the operation of an unillustrated objective lens driving control device (for example, a focus servo control device). As a result, the objective lens 11 moves in a direction along the normal direction of the recording surface of the optical disc 11. As a result, the laser beam is condensed at a desired focal position on the optical disc 100.

  The main shaft support member 13 and the sub shaft support member 14 are typically arms composed of non-conductive members, and support the main shaft 22 and the sub shaft 23 to move the optical pickup 10 ( In particular, movement along the radial direction of the optical disk 100 is possible.

  The countershaft biasing spring 15 is a specific example of the “biasing means” of the present invention, and typically biases the subshaft 23 in a direction perpendicular to the axial direction of the subshaft 23. It is a leaf spring made of metal. The resin cap 16 is, for example, a film-like component formed of a non-conductive resin, and is installed at a portion of the tip of the auxiliary shaft urging spring 15 that is in contact with the auxiliary shaft 23. That is, the secondary shaft biasing spring 15 biases (in other words, contacts) the secondary shaft 23 via the resin cap 16.

  Further, the optical pickup 10 includes, for example, the same components as those of a known optical pickup other than those described above. Particularly in the present embodiment, the conductive components (for example, the LDD and the objective lens driving device 12) in the optical pickup 10 are electrically connected to each other. In addition, these conductive parts that conduct each other are grounded. More specifically, the grounded conductive component controls the operation of the entire optical pickup device 1 and is connected to a predetermined terminal in a main board (not shown) serving as a power source, thereby It is entangled.

  The traverse mechanism 20 includes a spindle motor 21, a main shaft 22, a sub shaft 23, a transfer motor 24, a transfer member 25, and a transfer shaft 26.

  The spindle motor 22 rotates and stops the optical disc 100 to be mounted, and operates when accessing the optical disc 100. More specifically, the spindle motor 22 is configured to rotate and stop the optical disc 100 at a predetermined speed while receiving spindle servo from a servo unit (not shown) or the like.

  The main shaft 22 and the sub shaft 23 are shaft members for attaching the optical pickup 10 to the traverse mechanism 20, and as described above, the main shaft support member 13 and the sub shaft support member 14, the sub shaft biasing spring 15 and the resin cap. 16 is connected to the optical pickup 10 via The main shaft 22 and the sub shaft 23 are arranged so that the axial directions thereof are parallel to the radial direction of the optical disc 100 to be mounted. The pickup 10 guides the movement of the optical disk 100 in the radial direction.

  The transfer motor 24 is connected to the main body substrate (not shown), and is controlled to move the transfer member 25 along the transfer shaft 26 by a control unit such as a CPU connected to the main body substrate. One end of the transfer member 25 is disposed on the transfer shaft 26, and the other end is configured to hold the optical pickup 10 via the main shaft support member 13. According to such a transfer member 25, the movement of the optical pickup 10 is realized by moving along the transfer shaft 26 in accordance with the drive of the transfer motor 24. At this time, the axial direction of the transfer shaft 26 is parallel to the axial direction of each of the main shaft 23 and the sub shaft 24, so that the transfer member 25 moves along the transfer shaft 26, so that the optical pickup 10 It moves along the sub-axis 23 (that is, in the radial direction of the optical disc 100).

  Next, the basic operation of the optical pickup device 1 will be described. Laser light emitted from the LD provided in the optical pickup 10 is collected by the objective lens 11 to form a spot on the optical disc 100. When data is recorded, a recording mark is formed on the surface of the optical disc 100 by appropriately modulating the laser power of the laser light emitted by the LD under the control of the LDD. On the other hand, at the time of data reproduction, a light receiving signal included in the reflected light from the optical disc 100 is detected by a light receiving element (not shown) provided in the optical pickup 10.

  Under the control of a control unit such as a CPU connected to a main body substrate (not shown), the transfer motor 24 mounted on the traverse mechanism 20 is driven, so that the optical pickup 10 performs the data recording or reproducing operation. The optical disk 100 is transported toward the inner periphery or toward the outer periphery.

(2) Description of Effect In the data recording or reproducing operation, current is supplied to the circuit formed on the main body substrate, the LD, the LDD, the transfer motor 24, and the like. At this time, when the LD provided in the optical pickup 10 is driven, unnecessary radiation is generated according to the high-frequency superimposed current at that time. Such unnecessary radiation is typically generated when the optical pickup 10 is provided with conductive parts that are electrically connected to each other and serve as a loop antenna. In addition, it is known that such unnecessary radiation causes malfunction and noise in surrounding electronic components.

  Conventionally, in order to suppress such unwanted radiation, measures have been taken to cause conductive parts provided in the optical pickup 10 to conduct by being brought into contact with each other and fastened to each other, and to ground the whole. However, in the conventional optical pickup device 1, the optical pickup 10 and the traverse mechanism 20 may be in contact with each other via a conductive member (that is, conductive). Here, the traverse mechanism 20 is typically formed of a conductive member and is not grounded. For this reason, when the optical pickup 10 and the traverse mechanism 20 are conducted, a noise current in the optical pickup 10 that should originally be grounded flows to the traverse mechanism 20. As a result, the electronic component provided in the optical pickup 10 and the traverse mechanism 20 become conductive. As a result, there is a technical problem that the traverse mechanism 20 serves as a loop antenna and generates unnecessary radiation. Since the traverse mechanism 20 is typically larger than the optical pickup 10, the area of the formed loop antenna increases, so that it is not necessary as compared with the case where the traverse mechanism 20 is not interposed. Radiation will also increase.

  In light of the above, it is effective to suppress unnecessary radiation to insulate the optical pickup 10 from the traverse mechanism 20. Therefore, for example, measures are taken such as forming the main shaft support member 13 and the sub shaft support member 14 that are portions where the optical pickup 10 and the traverse mechanism 20 are in contact with each other by non-conductive members.

  By the way, the optical pickup 10 may vibrate greatly even when driven by a small vibration or impact. Typically, the member indicated by the main shaft 22 and the sub shaft 23, particularly the periphery of the sub shaft support member 14, is swung up and down, so that the entire optical pickup 10 vibrates. A technical problem that causes an error in recording or reproducing data due to such vibration has been pointed out.

  In order to solve such a technical problem, a countershaft biasing spring 15 may be provided in order to suppress vibration around the countershaft support member 14.

  The sub-shaft biasing spring 15 is typically a metallic leaf spring and is configured to bias the sub-axis 23 so that the optical pickup 10 does not vibrate at a portion in contact with the sub-shaft 23. At this time, when the countershaft biasing spring 15 is formed of a conductive member, the optical pickup 10 and the traverse mechanism 20 are conducted as described above.

  According to the present embodiment, the countershaft biasing spring 15 formed of a conductive member and the countershaft 23 are in contact with each other with the nonconductive resin cap 16 interposed therebetween. Therefore, the secondary shaft biasing spring 15 biases the secondary shaft 23 via the resin cap 16.

  For this reason, the auxiliary shaft urging spring 15 and the auxiliary shaft 23, and hence the optical pickup 10 and the traverse mechanism 20, are insulated, and therefore, generation of unnecessary radiation can be suppressed.

  Note that a traverse mechanism 20 and an optical pickup case (not shown) in which the traverse mechanism 20 and the optical pickup 10 are housed and form the optical pickup device 1 are, for example, a cushioning material such as a resin washer or a leaf spring. By connecting using an urging member or the like, it is possible to more suitably suppress the occurrence of vibration as described above.

  Here, with reference to FIG. 2 and FIG. 3, the noise level in the optical pickup device 1 according to the present embodiment and the noise level in the conventional optical pickup device that does not depend on the present embodiment, in other words, the conventional optical pickup device. In comparison, the effect of the present embodiment will be described.

  FIG. 2 is an example of a graph representing the frequency and noise level in the optical pickup device 1 that does not include the resin cap 16 according to the present embodiment. In other words, the graph shows the noise level in the conventional optical pickup device 1 because the configuration cannot receive the effect of suppressing unwanted radiation in the present embodiment.

  On the other hand, FIG. 3 is an example of a graph showing the frequency and noise level in the configuration in which the optical pickup device 1 in FIG. 2 is provided with the resin cap 15 according to the present embodiment.

  Here, in FIGS. 2 and 3, a line indicating a noise level of about 47 dB is the upper limit for regulating unwanted radiation. It is extremely unpreferable for the pickup device to detect noise at a level exceeding the regulation line. Further, even when noise of a level below the regulation line is detected, it is preferable that there is a sufficient margin between the noise level and the regulation line.

  Comparing the graphs of FIG. 2 and FIG. 3, the level of the prominent peak noise that is noticeable in the graph of FIG. 2 is suppressed in the graph of FIG. 3.

  Here, the conductive state of the secondary shaft and the optical pickup is not necessarily ensured, for example, by contact or fastening of conductive members with each other. Typically, the conductive state is maintained by vibration or impact. It is in an unstable conduction state, such as changing. As an example of such an unstable conductive state, for example, a case where a lubricant such as grease is applied between the countershaft and the biasing spring of the optical pickup is applied. . In such a case, in the portion where the oil film is formed by the lubricant, the optical pickup and the countershaft, and thus the traverse mechanism, are insulated, and on the other hand, the portion where the oil film is interrupted is conducted. Then, when the state of the oil film changes due to the vibration of the optical pickup or the like, an electrically unstable connection state is established and appears as noise on a peak as shown in the figure.

  Therefore, by providing the resin cap 16 in the present embodiment, the unstable conduction state between the auxiliary shaft 23 and the auxiliary shaft urging spring 15 as described above can be eliminated, and a completely insulated state can be achieved. Therefore, such peak noise is suppressed.

  Also, the noise level due to such unwanted radiation tends to increase significantly as the frequency becomes higher. The numerical value of noise shown in FIG. 2 also gradually increases from a frequency of 750 MHz with a certain degree of gradient as the frequency increases. That is, there is a positive correlation between the frequency and the noise level.

  On the other hand, when observing the noise level in the optical pickup device 1 according to the present embodiment shown in FIG. 3, it can be seen that the gradient of the noise level with respect to the frequency is suppressed as compared with FIG.

  In this embodiment, comparing FIG. 2 and FIG. 3, the level of noise due to unnecessary radiation is generally suppressed in the frequency range from 800 MHz to 1 GHz, and the suppression effect is particularly remarkable in the high frequency range. .

  As described above, according to the present embodiment, conductive parts such as a heat sink mounted on the non-conductive pickup body 17 are electrically connected to each other and grounded, and the optical pickup is provided. 10 and the traverse mechanism 20 are electrically insulated, so that the level of noise due to unnecessary radiation can be suitably suppressed.

  Incidentally, here, conducting and grounding each of the conductive parts means that, as described above, all the parts that can contribute to the generation of unnecessary radiation are conducted and grounded by forming a loop antenna. It is the purpose. Therefore, the conductive parts that do not serve as a loop antenna may be configured not to conduct or ground. In other words, the above-described effects can be enjoyed if the minimum conductive parts that can become a loop antenna are conducted and grounded. Further, by adopting a configuration in which the minimum necessary conductive parts are conducted in this way, it is possible to realize a reduction in cost necessary for constructing a circuit for unnecessary conduction.

  Also, typically, when so-called electrical components such as LDD are made conductive and grounded as an example of conductive components in this embodiment, they are made conductive by a circuit configuration and connected to, for example, a GND terminal. It is preferable to be grounded.

  Further, according to the present embodiment, the non-conductive resin cap 16 is installed on the conductive biasing spring 15 provided in the optical pickup 10, and then the biasing spring is interposed via the resin cap 16. 15 and the auxiliary shaft 23 are in contact with each other. According to such a configuration, the optical pickup 10 and the traverse mechanism 20 can be electrically insulated relatively easily.

  In addition, according to the above-mentioned Example, although the optical pick-up 10 and the traverse mechanism 20 are electrically insulated by installing the nonelectroconductive resin cap 16, even if insulation is implement | achieved by another aspect. It goes without saying that it is good.

  For example, the urging spring 15 may be formed of a non-conductive resin or the like, and the urging spring 15 formed of a conductive member is formed to be covered with a non-conductive resin or paint. Also good. As long as it is possible to electrically insulate the optical pickup 10 and the traverse mechanism 20 by electrically insulating at least the biasing spring 15 and the auxiliary shaft 23, the above-described book can be used. The remarkable effect which concerns on an Example can be enjoyed.

  Further, according to the above-described embodiment, the non-conductive resin cap 16 is installed on the countershaft biasing spring 15, but it is a member other than the countershaft biasing spring 15 and the traverse mechanism 20 or the traverse mechanism. A non-conductive resin cap 16 may be installed on a member in contact with a member included in 20. Also in this case, due to the configuration other than the resin cap 16, an electrical connection between the traverse mechanism 20 and a member that is a member other than the countershaft biasing spring 15 and that is in contact with the traverse mechanism 20 or a member included in the traverse mechanism 20 is performed. Insulation may be achieved.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and an optical pickup device with such a change The information recording / reproducing apparatus is also included in the technical scope of the present invention.

It is a block diagram which shows the basic structural example of the optical pick-up apparatus which concerns on a present Example. It is a graph showing the frequency and noise level in an optical pick-up apparatus which is not provided with the resin cap which concerns on a present Example. It is a graph showing the frequency and noise level in the structure provided with the resin cap which concerns on a present Example in the optical pick-up apparatus in FIG.

Explanation of symbols

1 Optical pickup device,
10 Optical pickup,
11 Objective lens,
12 Objective lens driving device,
13 spindle support member,
14 countershaft support member,
15 Countershaft biasing spring,
16 resin cap,
20 Traverse mechanism,
21 spindle motor,
22 spindle,
23 countershaft,
24 transfer motor,
25 transfer member,
26 Transfer shaft

Claims (8)

A housing formed of a non-conductive member, a plurality of components provided on the housing, and an optical pickup including a semiconductor laser that irradiates laser light to an information recording medium;
A traverse device comprising transport means for transporting the optical pickup in the radial direction of the information recording medium and a shaft member for guiding the transport of the optical pickup;
The optical pickup includes (i) a biasing unit that biases the shaft member in a direction orthogonal to the shaft member as one of the plurality of components, and (ii) the biasing unit and the It is connected to the shaft member via a housing,
The plurality of components are (i) formed of a conductive member, (ii) conductive, and (iii) ground faults,
The optical pickup device, wherein the optical pickup and the traverse device are electrically insulated.   The optical pickup device according to claim 1, wherein the urging unit and the shaft member are in contact with each other through a non-conductive member.   3. The optical pickup device according to claim 1, wherein a non-conductive member is formed on the urging unit by at least one of painting, insert molding, and vapor deposition.   The optical pickup device according to claim 2, wherein the urging unit and the shaft member are in contact with each other through a nonconductive resin. A housing formed of a non-conductive member, a plurality of components provided on the housing, and an optical pickup including a semiconductor laser that irradiates laser light to an information recording medium;
A traverse device comprising transport means for transporting the optical pickup in the radial direction of the information recording medium,
The plurality of components are (i) formed of a conductive member, (ii) conductive, and (iii) ground faults,
Of the plurality of components, a component that can contact the traverse device is in contact with the traverse device via a non-conductive member. The traverse device includes a shaft member that guides the transfer of the optical pickup,
The optical pickup device according to claim 5, wherein a component that can contact the traverse device among the plurality of components is a biasing unit that biases the shaft member in a direction orthogonal to the shaft member. A housing formed of a non-conductive member, a plurality of components provided on the housing, and an optical pickup including a semiconductor laser that irradiates laser light to an information recording medium;
A traverse device comprising transport means for transporting the optical pickup in the radial direction of the information recording medium,
One or more parts that do not contact the traverse device among the plurality of parts are (i) formed of conductive members, (ii) each conducting, and (iii) ground faults,
Of the plurality of components, a component that can come into contact with the traverse device is formed of a non-conductive member.   An information recording / reproducing apparatus comprising the optical pickup device according to claim 1.

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