JP2015043248A - Optical pickup and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup and an optical disk device in which temperature increase can be prevented while upsizing and weight increase are prevented.SOLUTION: An optical pickup A includes a flexible printed circuit board 9 that includes: a connection portion 921 for connection and fixation to terminals 12a to 12c; an extension portion 922 including a wiring pattern for earth extended from the connection portion 921; and a contact portion 923 provided to a tip of the extension portion 922. The connection portion 923 is in contact with a body 11 of a light source 1, the extension portion 922 is curved, and the connection portion 921 at a position apart from the body 11 connects and fixes a plurality of wiring patterns 924a to 924c and the plurality of terminals 12a to 12c corresponding thereto.

Description

  The present invention relates to an optical pickup and an optical disc apparatus, and more particularly to an optical pickup and an optical disc apparatus that effectively exhausts heat from a light source.

  An optical disc apparatus such as a BD player or a DVD player includes an optical pickup that detects light (return light) reflected on the optical disc by irradiating the optical disc with light. The optical pickup includes a semiconductor laser (light source) that generates laser light to be applied to the optical disk by supplying electric power. Such a semiconductor laser generates heat simultaneously when light is emitted.

  The optical pickup includes an electronic component that makes it difficult to operate stably or breaks a member when the internal temperature becomes high. Some of the optical pickups use a heat radiating member to radiate heat and suppress the temperature rise of the electronic component (for example, Patent Document 1).

  The optical pickup described in Patent Document 1 includes a semiconductor laser and an FMD (light receiving element) that detects laser light emitted from the semiconductor laser and passed through a polarization beam splitter. The laser output is set. In this optical pickup, the FMD is covered with a resin in order to detect light accurately, and the resin is easily deteriorated by a high temperature when irradiated with a laser beam. Therefore, a heat dissipating member having a high thermal conductivity and a large heat capacity is disposed on the opposite side across the flexible printed circuit board placed in contact with the FMD.

  The heat of the FMD is conducted to the heat radiating member through the flexible printed circuit board, and is released to the outside from the heat radiating member, thereby suppressing the temperature rise of the FMD and the resin when irradiated with laser light. Deterioration is suppressed.

JP 2011-23054 A

  However, in the configuration of Patent Document 1, a metal material having high heat conductivity is used as the heat radiating member, and the heat radiating member is increased in weight because it is formed to have a certain volume in order to ensure heat capacity. . In general, when an optical pickup is heavy, a large amount of electric power is required for operation, and quick operation becomes difficult, and the drive accuracy of the optical pickup may be reduced accordingly.

  Further, in the configuration of Patent Document 1, it is possible to suppress the temperature rise of the FMD, but it is difficult to lower the temperature of the semiconductor laser itself. Moreover, it is possible to suppress the temperature rise of the semiconductor laser by arranging the heat radiating member in the vicinity of the semiconductor laser. However, the increase of the heat radiating member increases the optical pickup and increases the weight. As a result, the operation accuracy of the optical pickup may be lowered.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an optical pickup and an optical disc capable of suppressing temperature increase while suppressing increase in size and weight. Is to provide a device.

  An optical pickup according to an aspect of the present invention includes a light source in which a plurality of terminals protrude from a main body, and a flexible printed circuit board in which a plurality of wiring patterns are covered with an insulating film, and the flexible printed circuit board includes the plurality of wirings. A connection part for connecting and fixing the pattern to the corresponding terminal, a grounding wiring pattern extending from the connection part, an extension part including the extended grounding wiring pattern inside, and a tip of the extension part And a contact portion including the extended grounding wiring pattern, the contact portion is in contact with the main body, the extension portion is curved, and the connection portion is separated from the main body. At the position, the plurality of wiring patterns are connected and fixed to the corresponding terminals.

  In an optical pickup according to one aspect of the present invention, heat from a light source is radiated using a flexible printed circuit board (ground wiring pattern thereof). Accordingly, it is not necessary to attach a separate heat sink to cool the light source, and it is possible to suppress an increase in weight and size (increase in thickness) of the optical pickup.

  In the optical pickup according to the above aspect, preferably, the grounding wiring pattern and the insulating film of the contact portion are formed with a plurality of through holes through which each of the plurality of terminals penetrates. The through-hole formed in the wiring pattern is formed in the insulating film so as to be larger than the cross-sectional area of the terminal penetrating through a hole through which a terminal other than the grounding terminal passes among the plurality of terminals. Among the through holes, the holes through which the terminals other than the grounding terminal pass are formed in the wiring pattern for grounding, and the terminals other than the grounding terminal are formed inside the through hole. Yes. If comprised in this way, since a contact part is arrange | positioned around the terminal with which the light source is equipped, it can arrange | position so that a terminal may penetrate a contact part. At this time, it can suppress that terminals other than a ground terminal among the terminals provided in the light source contact with the wiring pattern for grounding.

  In the optical pickup according to the above aspect, the insulating film is preferably formed in at least a part of a region of the contact portion in contact with the main body so that the grounding wiring pattern is in direct contact with the main body. Consists of not including parts. With this configuration, heat can be directly transferred from the light source body to the wiring pattern having a higher thermal conductivity than the insulating film, so that the heat radiation efficiency from the light source body can be increased.

  In the optical pickup according to the above aspect, the extension portion is preferably configured to generate an elastic force that presses the contact portion against the main body. With this configuration, when the connecting portion is fixed, the contact portion is pressed against the light source body by the elastic force of the extension portion, so that the contact portion and the light source body are reliably in contact with each other. Thereby, it can suppress that thermal resistance becomes large by the clearance gap between a contact part and the main body of a light source.

  In the optical pickup according to the above aspect, a notch is preferably formed in a part of the edge of the insulating film of the extension. By comprising in this way, it is possible to adjust the elastic force which presses the contact part by an extension part. Further, by providing a notch and suppressing the elastic force, the extension portion can reduce the radius of curvature at the notch portion, and the overhang when the extension portion is bent can be reduced.

  In the optical disk device according to one aspect of the present invention, the optical pickup includes a substrate to which a flexible printed circuit board is connected, and the substrate is disposed so as to face the optical disk. With such a configuration, the substrate can be cooled by the airflow generated by the rotation of the optical disk, so that the heat dissipation efficiency can be improved.

  According to the present invention, it is possible to provide an optical pickup and an optical disc apparatus that can suppress an increase in temperature while suppressing an increase in size and weight.

1 is a schematic diagram showing an overall configuration of an example of an optical disc apparatus according to the present invention. It is the perspective view which looked at an example of the optical pick-up concerning this invention from the opposite side to the optical disk. FIG. 3 is a plan view of the optical pickup shown in FIG. 2 viewed from the side opposite to the optical disk. FIG. 3 is a plan view of the optical pickup shown in FIG. 2 viewed from the optical disk side. It is a figure which shows schematic arrangement | positioning of the optical element used for the optical pick-up shown in FIG. It is sectional drawing to which the vicinity of the 1st light source of the optical pick-up shown in FIG. 2 was expanded. It is an enlarged view of the light source attachment part of the flexible printed circuit board used for the optical pick-up concerning this invention. It is an enlarged view of the light source attachment part of the flexible printed circuit board used for the other example of the optical pick-up concerning this invention. It is an enlarged view of the light source attachment part of the flexible printed circuit board used for the other example of the optical pick-up concerning this invention.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)

  FIG. 1 is a schematic diagram showing the overall configuration of an example of an optical disk apparatus according to the present invention. The optical disc apparatus Dp according to the present invention has a configuration capable of reproducing BD (Blu-Ray Disc: registered trademark), DVD and CD as an optical disc Ds for recording information. Specifically, the optical disc device Dp includes an optical pickup A, an RF amplifier Ra, a reproduction processing circuit Pw, an output circuit Ot, a driver Dr, a feed motor Mt, a spindle motor Sp, and a control unit Cont.

  The optical pickup A irradiates the optical disc Ds with laser light and detects light (return light) reflected by the optical disc Ds to read various information (such as audio information and video information) recorded on the optical disc Ds. Equipment. The optical pickup A generates the detected return light as an electrical signal, and passes the signal to the RF amplifier Ra as an information signal based on various information. Details of the optical pickup A will be described later.

  The RF amplifier Ra has a function of amplifying the information signal read by the optical pickup A. The information signal amplified by the RF amplifier Ra is sent to the control unit Cont. The reproduction processing circuit Pw is a circuit that acquires the information signal amplified by the RF amplifier Ra via the control unit Cont, and performs a reproduction process (for example, image processing) on the information signal. The output circuit Ot is a circuit for outputting video and / or audio recorded on the optical disc Ds to a monitor and / or a speaker (both not shown). The output circuit Ot performs D / A conversion processing on the information signal processed by the reproduction processing circuit Pw. Some output devices can receive digital signals, and when outputting to such devices, the D / A conversion processing may be omitted.

  The driver Dr performs drive control of the feed motor Mt and the spindle motor Sp based on an instruction from the control unit Cont. The feed motor Mt is a motor for moving the optical pickup A in the radial direction of the optical disc Ds. The spindle motor Sp is a motor that rotates the optical disc Ds. The optical disk Ds is rotated while being placed on a turntable (not shown), and the spindle motor Sp rotates the optical disk Ds by rotating the turntable.

  The control unit Cont generates a reproduction signal, a focus error (FE) signal, and a tracking error (TE) signal based on an information signal output from a light receiving element PD (see FIG. 2) described later provided in the optical pickup A. To do. Further, the control unit Cont performs focus servo control based on the FE signal and tracking servo control based on the TE signal during reproduction of the optical disc Ds.

  2 is a perspective view of an example of the optical pickup according to the present invention as viewed from the side opposite to the optical disc, FIG. 3 is a plan view of the optical pickup shown in FIG. 2 as viewed from the side opposite to the optical disc, and FIG. 2 is a plan view of the optical pickup shown in FIG. 2 viewed from the optical disk side, and FIG. 5 is a diagram showing a schematic arrangement of optical elements used in the optical pickup shown in FIG.

  As shown in FIGS. 2 to 5, the optical pickup A includes a first light source 1, a second light source 2, a half mirror 21, a polarization beam splitter 3, and a collimator lens 4. Further, the optical pickup A includes a first rising mirror 51, a second rising mirror 52, a quarter wavelength plate 61, a quarter wavelength plate 62, a first objective lens 71, a second objective lens 72, and a diffraction grating 22. The sensor lens 8 and the light receiving element PD are provided.

  The optical pickup A includes a chassis 10 to which the above-described optical elements are attached, and a main substrate 101 attached to the upper surface of the chassis 10 (the surface on the optical disc side). The optical pickup A is slidably supported on parallel axes (not shown).

  Among the optical elements described above, the optical elements other than the first objective lens 71 and the second objective lens 72 are arranged in a recess in which one surface of the chassis 10 is opened. A metal flat cover (not shown) is attached and fixed so as to cover the opening. By attaching the cover, the optical element is arranged in a space sealed by the chassis 10 and the cover, so that foreign substances such as dust and dirt can be prevented from entering and adhering to the optical element.

  As shown in FIG. 4, the first objective lens 71 and the second objective lens 72 are provided in the actuator Act. The actuator Act is a drive device that moves the first objective lens 71 or the second objective lens 72 in the radial direction or the approaching / separating direction of the optical disc. The actuator Act is driven and controlled by the driver Dr.

  The optical element of the optical pickup A will be described in detail. The first light source 1 is a laser diode that emits blue laser light (wavelength of about 405 nm) for recording / reproducing BD. The laser light emitted from the first light source 1 enters the polarization beam splitter 3. The polarization beam splitter 3 is an optical element corresponding to the laser beam emitted from the first light source 1, that is, the blue laser beam. When the blue laser beam is incident, the optical beam is reflected or transmitted depending on the polarization direction of the incident beam. It is an element. The polarization beam splitter 3 will be described as an optical element that reflects P-polarized light and passes S-polarized light. The laser light emitted from the first light source 1 is P-polarized laser light, reflected by the reflecting surface of the polarizing beam splitter 3, and the optical path is bent.

  On the other hand, the second light source 2 is a laser diode that can selectively emit red laser light for recording / reproducing DVD (wavelength: about 650 nm) or infrared laser light for recording / reproducing CD (wavelength: about 780 nm). Red laser light or infrared laser light emitted from the second light source 2 enters the half mirror 21. A part of the light quantity of the red laser light or infrared laser light incident on the half mirror 21 passes through the half mirror 21, and the remaining light quantity is reflected and enters the polarization beam splitter 3.

  As described above, since the polarization beam splitter 3 is an optical element for blue laser light, all (substantially all) incident light amounts pass through the red laser light and the infrared laser light. Note that in the following description, when laser light is described without particular distinction, it refers to all of blue laser light, red laser light, and infrared laser light. That is, when it is simply described as laser light, it is converted by the optical element regardless of the wavelength of the laser light, reflected, and passes through the optical element.

  Laser light emitted from the polarization beam splitter 3 enters the collimator lens 4. The collimator lens 4 is a lens for correcting the aberration of divergent light to obtain parallel light. Note that the collimator lens 4 is movable in the optical axis direction in order to accurately convert light of different wavelengths of the blue laser light, red laser light, and infrared laser light into parallel light. The laser light that has passed through the collimator lens 4 enters the first rising mirror 51.

  The first rising mirror 51 is a dichroic mirror that reflects light included in a predetermined wavelength band and passes light in other wavelength bands. The first rising mirror 51 has a characteristic of reflecting blue laser light and passing red laser light and infrared laser light. The first rising mirror 51 reflects blue laser light in the optical disc (BD) direction (rising direction), and the blue laser light reflected by the first rising mirror 51 enters the quarter-wave plate 61. .

  The quarter wavelength plate 61 is an optical element that shifts the phase of incident light by a quarter wavelength. That is, the quarter wavelength plate 61 converts linearly polarized light into circularly polarized light and circularly polarized light into linearly polarized light. The blue laser light reflected by the first raising mirror 51 is linearly polarized light, passes through the quarter wavelength plate 61, is converted into circularly polarized light, and enters the first objective lens 71.

  The first objective lens 71 is a condensing lens that condenses blue laser light and irradiates the BD recording layer as a laser spot. The blue laser light (returned light) reflected by the recording layer of the optical disc (BD) returns to the original parallel light by passing through the first objective lens 71 and passes straight through the quarter wavelength plate 61. Converted to polarized light. The return light transmitted through the quarter-wave plate 61 is linearly polarized light rotated so as to be orthogonal to the original light. The return light that has passed through the quarter-wave plate 61 is reflected by the first rising mirror 51.

  On the other hand, when the laser beam emitted from the collimator lens 4 is a red laser beam or an infrared laser beam, it is out of the wavelength band reflected by the first rising mirror 51, so that all or almost all of the light amount is the first. It passes through the rising mirror 51. The red laser light or infrared laser light transmitted through the first rising mirror 51 is incident on the second rising mirror 52. The second rising mirror 52 is a total reflection type mirror, and red laser light or infrared laser light reflected by the second rising mirror 52 in the optical disc (DVD or CD) direction (rising direction) is 1/4. The light passes through the wave plate 62, is converted into circularly polarized light, and enters the second objective lens 72. The quarter wavelength plate 62 has the same effect as the quarter wavelength plate 61, and converts linearly polarized light into circularly polarized light and circularly polarized light into linearly polarized light. Although details are omitted, even when the quarter-wave plate 62 is used, the light from the collimator lens and the return light are linearly polarized light orthogonal to each other.

  The second objective lens 72 is a condensing lens that collects incident red laser light or infrared laser light and irradiates the recording layer of the corresponding optical disk (DVD or CD) as a laser spot. The red laser light or infrared laser light (return light) reflected by the DVD or CD returns to the original parallel light by passing through the second objective lens 72, and is reflected by the second rising mirror 52 and reflected by the second rising mirror 52. 1 is incident on the rising mirror 51. As described above, since the first rising mirror 51 allows light other than the blue laser light to pass through without reflecting, the red laser light and the infrared laser light pass through the first rising mirror 51.

  The blue laser light reflected by the first rising mirror 51 and the red laser light and infrared laser light that have passed through the first rising mirror 51 enter the collimator lens 4 through the same (substantially the same) optical path as the forward path. . The laser light incident on the collimator lens 4 is converted from parallel light into convergent light and incident on the polarization beam splitter 3.

  As described above, by using the quarter-wave plates 61 and 62, the respective polarization directions of the laser light incident from the light source side and the return light reflected by the optical disc are orthogonal to each other. The return light of the blue laser light is linearly polarized light orthogonal to the light from the light source. The polarization beam splitter 3 performs reflection or transmission in the polarization direction, and reflects the light from the first light source 1, so that the return light passes through the polarization beam splitter 3. Further, since the polarization beam splitter 3 is an optical element corresponding to blue laser light, red laser light and infrared laser light also pass through the polarization beam splitter 3.

  The light that has passed through the polarization beam splitter 3 enters the half mirror 21. A part of the laser light is reflected by the half mirror 21, and the rest passes. The light that has passed through the half mirror 21 passes through the diffraction grating 22 and the sensor lens 8 and enters the light receiving element PD. The laser light incident on the light receiving element PD is converted into an electric signal by the light receiving element PD.

  As shown in FIG. 2 and the like, the optical pickup A includes a flexible printed board 9 for supplying power to the light source. In the optical pickup A, a flexible printed circuit board 9 for supplying power to the first light source 1 will be described for convenience of explanation. 6 is an enlarged schematic cross-sectional view of the vicinity of the first light source of the optical pickup shown in FIG. In addition, although the 1st light source 1 shown in FIG. 6 is set as the structure which arranged the terminal in a line for easy understanding, it is equivalent to the structure shown in FIG.

  As shown in FIG. 6, the first light source 1 includes a main body 11 and three terminals 12 a, 12 b, and 12 c that protrude from the main body 11. Of the three terminals, the terminal 12a is a ground terminal, and the remaining terminals 12b and 12c are terminals to which electric signals are input. These terminals are connected to the main board 101 via the flexible printed board 9.

  Next, the flexible printed circuit board 9 will be described. As shown in FIG. 3, the flexible printed circuit board 9 includes a board mounting part 91 connected to the main board 101 and a light source mounting part 92 formed integrally with the board mounting part 91 and connected to the first light source 1. I have.

  FIG. 7 is an enlarged view of a light source mounting portion of a flexible printed board used in the optical pickup according to the present invention. The flexible printed circuit board includes a film-like wiring pattern and an insulating member provided so as to cover the outside of the wiring pattern. As shown in FIG. 7, the power supply attachment portion 92 includes a connection portion 911 for connection to the substrate attachment portion 91, a connection portion 921 connected to the terminals 12 a, 12 b, and 12 c of the first light source 1, and a connection portion 921. An extending portion 922 that extends, and a contact portion 923 that is formed at the tip of the extending portion 922 and contacts the main body 11 of the first light source 1 are provided. The connection portion 911 and the extension portion 922 have a band shape, and the connection portion 921 and the contact portion 923 have a substantially circular shape.

  The light source mounting portion 92 includes a wiring pattern 924a connected to the terminal 12a, a wiring pattern 924b connected to the terminal 12b, and a wiring pattern 924c connected to the terminal 12c. Since the terminal 12a is a ground terminal, the wiring pattern 924a is a grounding wiring pattern. The wiring patterns 924a, 924b, and 924c are wiring patterns formed of a conductive metal (for example, copper) film. Note that these wiring patterns are formed integrally with a wiring pattern (not shown) provided on the board mounting portion 91. The wiring patterns 924a, 924b, and 924c are covered with the insulating film 900.

  The connecting portion 921 includes lands 925a, 925b, and 925c for connecting the wiring patterns 924a, 924b, and 924c and the terminals 92a, 92b, and 92c. Since the lands 925a, 925b, and 925c are soldered, the insulating film 900 is removed. Through holes 926a, 926b, and 926c through which the terminals 12a, 12b, and 12c pass through the wiring patterns 924a, 924b, and 924c are formed at substantially the center of the lands 925a, 925b, and 925c.

  The connection portion 921 is formed wider than the connection portion 911 (here, circular) because the wiring patterns 924a, 924b, and 924c are formed thicker to form the lands 925a, 925b, and 925c, respectively. ing. However, if the lands 925a, 925b, and 925c can be formed, the width may be the same as that of the connecting portion 911.

  Only the wiring pattern 924 a that is a ground wiring is formed to be extended, and the wiring pattern 924 a is provided inside the extension portion 922. The wiring pattern 924 a is further extended to the distal end side of the extension portion 922 and extends to the contact portion 923.

  The contact portion 923 is formed in a disc shape so as to come into contact with the main body of the first light source 1 over a wide area, and a wiring pattern 920a having a circular shape is provided therein. The wiring pattern 920a is formed integrally with the wiring pattern 924a. The wiring pattern 920a of the contact portion 923 includes a through hole 927a having a size substantially equal to the outer diameter of the terminal 12a (ground terminal), and through holes 927b and 927c larger than the outer diameters of the terminal 12b and the terminal 12c. .

  In the contact portion 923, a through window 928 a is formed in the insulating film 900 so as to overlap with the through hole 927 a. The insulating film 900 is formed with through windows 928b and 928c formed so as to overlap the through holes 927b and 927c and to have a smaller diameter than the through holes 927b and 927c and to fit inside the through holes 927b and 927c. ing. The through windows 928b and 928c are provided to prevent contact between the terminals 12b and 12c and the edges of the through holes 927b and 927c, that is, the wiring pattern 920a. Note that the contact portion 923 can be accurately positioned by setting the through windows 928a, 928b, and 928c to be in close contact with the terminals 12a, 12b, and 12c.

  7, the lands 925a, 925b, and 925c of the connecting portion 921, the through holes 927a, 927b, and 927c of the contact portion 923 and the through windows 928a, 928b, and 928c are symmetrical with respect to the extension portion 922. It is provided to become.

  As shown in FIG. 6, the flexible printed circuit board 9 bends the extension portion 922 and allows the terminals 12 a, 12 b, and 12 c to pass through the through windows 928 a, 928 b, and 928 c of the contact portion 923, and makes the contact portion 921 the first light source 1. The main body 11 is brought into contact. Thereby, in the contact part 923, while making the wiring pattern 920a and the terminal 12a contact, the contact with the wiring pattern 920a and the terminals 12b and 12c is suppressed.

  Further, the terminals 12a, 12b and 12c are passed through the through holes 926a, 926b and 926c of the lands 925a, 925b and 925c of the connecting portion 921. Then, the connecting portions 921 are fixed to the terminals 12a, 12b, and 12c by soldering the lands 925a, 925b, and 925c to the terminals 12a, 12b, and 12c, respectively. By bending the extension portion 922, the extension portion 922 exhibits an elastic force. The contact portion 923 is pressed against the main body 11 of the first light source 1 by the elastic force of the extension portion 922.

  As described above, by attaching the flexible printed circuit board 9 to the first light source 1, the contact portion 923 of the light source attachment portion 92 is reliably brought into contact with the main body 11 of the first light source 1. For this reason, the heat generated by driving the first light source 1 is efficiently transmitted to the wiring pattern 920 a in contact with the main body 11. The transmitted heat is conducted to the main substrate 101 through the wiring pattern 924a formed integrally with the wiring pattern 920a. Since the main board 101 is disposed on the optical disk side and is cooled by the airflow generated by the rotation of the optical disk, the heat transmitted to the main board 101 is easily radiated. As described above, in the optical pickup A, the heat generated in the first light source 1 is efficiently discharged using the flexible printed circuit board 9, in other words, the cooling performance of the first light source 1 is enhanced.

  In the present embodiment, the configuration for cooling the first light source 1 is described. However, the second light source 2 may also be configured to perform cooling using a flexible printed board.

(Second Embodiment)
Another example of the optical pickup according to the present invention will be described with reference to the drawings. FIG. 8 is an enlarged view of a light source mounting portion of a flexible printed board used in another example of the optical pickup according to the present invention. The optical pickup of the present embodiment has the same configuration as the optical pickup of the first embodiment except that the light source mounting portion 92B of the flexible printed board is different. Therefore, substantially the same components are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  As shown in FIG. 8, the light source mounting portion 92 </ b> B has an insulating film 900 on the side in contact with the main body 11 of the first light source 1 so that the wiring pattern 920 a of the contact portion 923 is in direct contact with the main body 11 of the first light source 1. The contact area 93 is removed. Here, the contact region 93 has a circular shape. Thus, by providing the contact region 93, the main body 11 of the first light source 1 and the wiring pattern 920a having a high thermal conductivity can be directly contacted, and the cooling performance of the first light source 1 can be improved. It is. In addition, since the wiring pattern 920a is a ground wiring, the main body 11 of the first light source 1 can be grounded.

  Further, the insulating film 900 remains on the opposite side of the contact portion 923 where the contact region 93 is formed, and through windows 928a, 928b, and 928c are formed in the insulating film 900. Therefore, even when the contact region 93 is formed in the contact portion 923, it is possible to prevent contact between the through holes 927b and 927c and the terminals 12b and 12c.

  Other than this, it has the same features as the first embodiment.

(Third embodiment)
Still another example of the optical pickup according to the present invention will be described with reference to the drawings. FIG. 9 is an enlarged view of a light source mounting portion of a flexible printed board used in another example of the optical pickup according to the present invention. The optical pickup of the present embodiment has the same configuration as the optical pickup of the first embodiment, except that the light source mounting portion 92C of the flexible printed board is different. Therefore, substantially the same components are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  As shown in FIG. 9, a notch 94 is provided in the extension 922 of the light source mounting portion 92C. By providing the notch 94, the elastic force of the extension part 922 when the light source attachment part 92C is attached to the first light source 1 can be adjusted. That is, the light source mounting portion 92C is easily bent at the portion where the notch 94 is provided, and is adjusted so that the elastic force is weakened accordingly.

  Further, by providing the notch 94 in this manner, when the extension portion 922 is curved, it is easy to bend at the portion where the notch 94 is formed, so that the protrusion due to the bending of the extension portion 922 can be reduced. is there.

  Other than this, it has the same features as the first embodiment.

  In the above-described embodiment, the extension portion 922 extends in the same direction as the connection portion 911. However, the present invention is not limited to this, and the centrifugal direction of the extension portion 922 does not overlap the connection portion 911. A wide angle can be widely used. Further, the direction of the extension 922 may be adjusted according to the configuration around the light source of the optical pickup A.

  When the terminals 12a, 12b, and 12c are passed through the through holes 926a, 926b, and 926c of the connection portion 921 after the contact portion 923 is brought into contact with the light source, the through holes 926a, 926b, and 926c are connected to the terminals 12a, 12b, and 12c, and It is formed large as long as it does not affect the connection. This facilitates attachment of the printed circuit board, which is a negative history, to the light source.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

Dp Optical disk device Ra RF amplifier Pw Reproduction processing circuit Ot Output circuit Dr Driver Mt Feed motor Sp Spindle motor Cont Control part A Optical pickup 1 First light source (for BD)
11 Main body 12a to 12c Terminal 10 Chassis 101 Main board 102 Shaft through hole 103 Engaging recess 2 Second light source (for CD / DVD)
21 Half mirror 3 Polarizing beam splitter 4 Collimator lens 51 First rising mirror 52 Second rising mirror 61 1/4 wavelength plate 62 1/4 wavelength plate 71 First objective lens (for BD)
72 Second objective lens (for CD / DVD)
DESCRIPTION OF SYMBOLS 8 Sensor lens 9 Flexible printed circuit board 91 Board | substrate attachment part 911 Connection part 92 Light source attachment part 920a Wiring pattern 921 Connection part 922 Extension part 923 Contact part 924a-924c Wiring pattern 925a-925c Land 926a-926c Through-hole 927a-927c Through-hole 928a ~ 928c Through window

Claims (7)

A light source with a plurality of terminals protruding from the main body;
And a flexible printed circuit board with a plurality of wiring patterns covered with an insulating film,
The flexible printed circuit board is
A connecting portion for connecting and fixing the plurality of wiring patterns to the corresponding terminals;
Extending the wiring pattern for grounding from the connection part, and an extension part containing the extended wiring pattern for grounding inside,
A contact portion provided at a tip of the extension portion and including the extended grounding wiring pattern;
The contact portion is in contact with the main body, the extension portion is curved, and the connection portion is connected and fixed to the corresponding terminal at a position away from the main body, respectively. Features an optical pickup. A plurality of through holes through which each of the plurality of terminals penetrates are formed in the grounding wiring pattern and the insulating film of the contact portion,
The through-hole formed in the wiring pattern for grounding is formed larger than the cross-sectional area of the terminal penetrating through the hole through which a terminal other than the grounding terminal passes among the plurality of terminals.
Of the through holes formed in the insulating film, a hole through which a terminal other than the grounding terminal passes is formed in the wiring pattern for grounding and is formed inside a hole through which a terminal other than the grounding terminal passes. The optical pickup according to claim 1.   The at least part of the area of the contact portion in contact with the main body includes a portion where the insulating film is not formed so that the grounding wiring pattern is in direct contact with the main body. The optical pickup according to claim 2.   The optical pickup according to claim 1, wherein the extension portion generates an elastic force that presses the contact portion against the main body.   The optical pickup according to claim 1, wherein a notch is formed in a part of the edge of the insulating film of the extension portion.   An optical disc apparatus comprising the optical pickup according to claim 1. The optical pickup includes a substrate to which a flexible printed circuit board is connected,
The optical disk apparatus according to claim 6, wherein the substrate is disposed so as to face the optical disk.

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