JP5163790B2 - Circuit board fixing structure and recording medium reproducing apparatus - Google Patents

Description

  The present invention relates to a circuit board fixing structure provided in a chassis and a recording medium reproducing apparatus having the structure.

  Generally, a circuit board is fixed to a chassis in an electric device. The same applies to a recording medium playback device such as an optical disk player that plays back an optical disk such as a DVD or a BD (Blu-ray Disc). Here, there are various methods for positioning and fixing the circuit board.

  For example, in Patent Document 1, in an electronic device including at least a sheet metal chassis and a wiring board attached to the chassis, a board holding piece for holding the upper surface of the wiring board and a board supporting piece for supporting the lower surface of the wiring board are provided. The chassis is provided with a cut-and-raised portion, while an opening is formed in the wiring board, the chassis's raised-and-raised portion is inserted into the opening of the wiring board, and the wiring board is moved laterally to open the edge of the wiring board. Between the board holding piece and the board support piece of the cut and raised part, and the edge of the wiring board is placed so that the opening edge of the wiring board does not come off between the board holding piece and the board support piece of the cut and raised part. The structure which stopped with the stopping member is disclosed.

  Patent Document 2 includes an electric circuit board on which electric components are mounted, a fixing plate to which the electric circuit board is fixed, and a standing wall that is close to the periphery of the electric circuit board. An electric circuit in which a notch for exposing a part to the outside and a pressing piece formed by bending a part of a standing wall located at the periphery of the notch are formed and an electric circuit board is pressed by an end of the pressing piece A structure for preventing a substrate from floating is disclosed.

  Further, Patent Document 3 discloses a rib that is provided on the printed board facing surface of the base member and that contacts the printed board when the printed board is fixed, an opening provided on the printed board facing surface, and an edge near the rib of the opening. An extension piece made of an elastic member extending toward the center of the opening, a body portion made of an elastic member standing on the side fixing the printed circuit board from the tip of the extension piece, and a tip portion of the body portion There is disclosed a printed circuit board fixing structure that includes a locking claw provided on a side facing the rib, and that fixes the printed circuit board to a base member with the rib and the locking claw.

  Further, in Patent Document 4, in a positioning structure for positioning and mounting a printed circuit board on which a component is mounted at a predetermined position of the chassis, at least three standing claws that engage with at least three side edges of the printed circuit board are provided on the chassis. Discloses a printed circuit board positioning structure.

  Further, Patent Document 5 includes a board that is housed in a casing composed of an upper casing and a lower casing and on which electronic components are mounted, and the lower casing includes a rib that supports the substrate and the board In the electronic device housing structure having an insulating cover for protecting the substrate, the insulating cover is provided with a nail-fitting portion in which a nail for fixing the nail is provided. Discloses an electronic device casing structure that includes a flexible flange surrounding the outer periphery of the substrate and sandwiched between the rib and the substrate.

JP 2010-141106 A JP 2000-138477 A JP-A-10-303574 Japanese Utility Model Publication No. 6-13188 Registered Utility Model No. 3021144

  The above Patent Documents 1, 2, and 5 make it possible to attach a circuit board to a chassis without using screws. Further, Patent Document 3 fixes a circuit board to a chassis with a fixing screw and a hooking portion. In Patent Document 4, the circuit board is positioned with the standing claws, and the circuit board is fixed to the chassis with the screws. As described above, Patent Documents 1 to 5 use a structure for holding the circuit board in addition to using screws (screws) as means for fixing the circuit board.

  By the way, in order to efficiently dissipate heat generated from the electronic components mounted on the circuit board, there is a case where the heat dissipation sheet is attached to the chassis and the heat dissipation sheet and the circuit board are brought into close contact with each other. In this case, the circuit board is lifted depending on the height of the heat radiation sheet. Therefore, if the four sides of the circuit board are fixed with screws, the circuit board is easily adhered to the heat radiation sheet. However, it takes time to fix the screws when assembling, and the parts cost is high.

  Therefore, if a structure for holding the circuit board as in Patent Documents 1 to 5 is used, workability may be improved and cost may be reduced. However, these structures do not always solve the problems of positioning, fixing and preventing the circuit board from being positioned.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit board fixing structure that realizes positioning, fixing, and floating prevention of a circuit board, as well as improvement in workability and cost reduction. Another object of the present invention is to provide a recording medium reproducing device having the fixed structure.

  In order to achieve the above object, the present invention provides a circuit board fixing structure provided in a chassis, wherein the first piece extends from the wall of the chassis substantially perpendicular to the circuit board toward the circuit board at a substantially right angle. A second piece extending from the first piece along the side end surface of the circuit board, and extending from the second piece to the circuit board so as to face the first piece. A third piece portion, wherein the circuit board is sandwiched between the first piece portion and the third piece portion.

  According to this configuration, the circuit board can be supported by the first piece, can be positioned by the second piece, and can be pressed by the third piece.

  In the circuit board fixing structure described above, it is preferable that the third piece is located on the upper surface side of the circuit board and is smaller than the first piece.

  According to this configuration, when the circuit board is engaged with the fixed structure, the circuit board can be inserted between the third piece part along the first piece part, and workability is good.

  In the circuit board fixing structure described above, it is preferable that the circuit board has a fourth piece portion extending obliquely upward from an end portion of the third piece portion. In the circuit board fixing structure, the end of the third piece may be an end in a direction in which the first piece extends, or a direction in which the third piece extends. It may be the end of.

  According to these configurations, when the circuit board is engaged with the fixed structure, first, the circuit board is moved along the fourth piece part from obliquely above, and then along the first piece part. It can be inserted between the one piece part and the third piece part, and workability is good.

  In the circuit board fixing structure described above, it is preferable that the chassis is a sheet metal member and the first to third pieces are formed by bending from the viewpoint of rigidity and cost.

  In the circuit board fixing structure described above, the circuit board may be sandwiched between the first piece and the third piece.

  According to this structure, it is also possible to provide a copper foil or the like at the portion that contacts the first piece portion or the third piece portion of the circuit board to be grounded.

  Furthermore, the present invention provides a recording medium reproducing device having any one of the circuit board fixing structures described above.

  According to the present invention, the circuit board fixing structure can reduce the number of components and reduce the cost as compared with the case where the circuit board is fixed only by screwing. In addition, since the circuit board can be inserted into the fixed structure along the fourth piece or the first piece, workability is improved. Moreover, since the circuit board is positioned by the second piece, workability is good. In addition, since the circuit board is pressed by the third piece, the circuit board is prevented from being lifted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an HDD-integrated optical disk device and peripheral devices thereof according to an embodiment of the present invention. 1 is a perspective view of a chassis of an HDD integrated optical disc apparatus according to an embodiment of the present invention. It is an enlarged view of the part enclosed by the circle | round | yen of FIG. 2A. It is the perspective view which looked at the chassis of Drawing 2A from a different direction. FIG. 3B is an enlarged view of a portion surrounded by a circle in FIG. 3A. It is the figure which added the circuit board to FIG. 2A. FIG. 4B is an enlarged view of a portion surrounded by a circle in FIG. 4A. It is a perspective view of the other form of the chassis of the HDD integrated optical disk apparatus which is one Embodiment of this invention. FIG. 5B is an enlarged view of a portion surrounded by a circle in FIG. 5A. It is the perspective view which looked at the chassis of Drawing 5A from the undersurface side.

  Hereinafter, a hard disk drive (HDD) integrated optical disk device as a recording / reproducing device will be described as an example of the recording medium reproducing device of the present invention.

  FIG. 1 is a block diagram showing the configuration of an HDD integrated optical disk device 10 and its peripheral devices. Connected to the HDD-integrated optical disk device 10 are a display device 11 such as a television and an external device 12 typified by a recording / playback device such as a set-top box or a video deck such as a cable television or satellite broadcast. The HDD-integrated optical disc apparatus 10 is compatible with BD (Blu-ray Disc) and DVD recording / playback. The HDD integrated optical disk device 10 can be operated by a remote controller 13.

  The HDD-integrated optical disk apparatus 10 includes a tuner 16, a video / audio compression / decompression unit 17, an HDD recording / reproducing unit 18, a BD / DVD recording / reproducing unit 19, an OSD (On Screen Display) unit 20, and a video output unit. 21, an audio output unit 22, a memory 23, a remote control reception unit 24, an external I / F 25, and a control unit 26.

  The tuner 16 demodulates and digitizes the digital television broadcast signal received by the antenna 15. The video / audio compression / decompression unit 17 compresses and encodes video / audio data received from the tuner 16 or the external device 12 in accordance with MPEG2 or the like, or is reproduced by the HDD recording / reproducing unit 18 or the BD / DVD recording / reproducing unit 19. The compressed video / audio data is decompressed and decoded.

  The HDD recording / reproducing unit 18 records the compressed video / audio data received from the video / audio compression / decompression unit 17 on the HDD or reproduces the data recorded on the HDD. The BD / DVD recording / reproducing unit 19 records the compressed video / audio data received from the video / audio compression / decompression unit 17 on the inserted DVD or BD, or reproduces the data recorded on the DVD or BD. To do.

  The OSD unit 20 allows various setting values to be set while being displayed on a part of the display device 11. The video output unit 21 analogizes the video signal from the OSD unit 20 and outputs the analog signal to the display device 11. The audio output unit 22 converts the audio signal from the video / audio compression / expansion unit 17 into an analog signal and outputs the analog signal to the display device.

  The memory 23 includes a ROM and a RAM, and stores various programs and various data. The remote control receiving unit 24 includes an infrared light receiving unit and the like, and receives a signal from the remote control 13. The external I / F 25 includes an external input terminal to which the external device 12 is connected. The control unit 26 includes a microprocessor and the like, and controls each unit of the HDD integrated optical disc apparatus 10.

  2A is a perspective view of the chassis of the HDD integrated optical disk device 10, and FIG. 2B is an enlarged view of a portion surrounded by a circle in FIG. 2A. 3A is a perspective view of the chassis of FIG. 2A viewed from different directions, and FIG. 3B is an enlarged view of a portion surrounded by a circle of FIG. 3A. 4A is a diagram in which a circuit board is added to FIG. 2A, and FIG. 4B is an enlarged view of a portion surrounded by a circle in FIG. 4A.

  The chassis 30 is a bottom chassis on which various members of the HDD integrated optical disk device 10 are mounted, and also serves as a housing. The chassis 30 is made of metal such as iron, and is formed by bending a sheet metal member by bending, drawing, punching, or the like.

  The circuit board 40 is a board on which members such as the memory 23 and the control unit 26 are mounted. The circuit board 40 is fixed to the chassis 30 with screws and a fixing structure described later. In addition, it can replace with a screw | thread and can also use latching means, such as a hook. Hereinafter, the circuit board fixing structure will be described in detail.

  The chassis 30 includes a bottom surface portion 31, a back surface portion 32 formed by bending the rear end of the bottom surface portion 31 substantially upward at the back side, and both side ends of the bottom surface portion 31 being bent substantially upward at the side surface. Side surfaces 33 and 33, and a front surface portion 34 formed by bending the front end of the bottom surface portion 31 substantially upward at the front side. With this configuration, the back surface portion 32 becomes a wall portion substantially perpendicular to the circuit board 40.

  Then, a part of the back surface portion 32 is cut and further bent to form a fixing portion 35 which is a fixing structure of the circuit board 40. The fixing portion 35 is located near the corner at the rear end of the circuit board 40. In addition, a part of the back portion 32 is cut and further bent to form a support portion 36 that supports the lower surface of the circuit board 40. The support 36 is located near the other corner of the rear end of the circuit board 40 and may be used as a ground for the circuit board 40.

  In addition, a heat radiating sheet installation base 37 is formed on the bottom surface 31 so as to protrude into a substantially quadrangular pyramid shape by drawing at a position facing the circuit board 40. A heat radiating sheet (not shown) made of silicon or the like is affixed to the heat radiating sheet mounting base 37. Further, two portions are formed on the bottom surface so as to protrude by drawing at positions facing the circuit board 40, and screw holes 38 and 39 for screwing are formed on the respective top portions. The heat dissipation sheet is designed to be disposed slightly higher than the screw holes 38 and 39.

  As shown in FIG. 2B or FIG. 3B, the fixing portion 35 includes first to fourth piece portions 35 a to 35 d formed by bending the chassis 30. The first piece 35 a is a rectangular plate-like member that extends (protrudes) from the back surface portion 32, which is a wall portion of the chassis 30 substantially perpendicular to the circuit board 40, to the circuit board 40 side at a substantially right angle. In the present embodiment, the first piece 35 a is located on the lower surface side of the circuit board 40 and serves as a pedestal part that supports the circuit board 40 away from the bottom surface part 31 of the chassis 30. The pedestal also serves to prevent contact (short circuit) with the bottom surface 31 of the chassis 30 when the circuit board 40 is bent. In addition, it is also possible to provide a copper foil or the like at the portion that contacts the first piece 35a of the circuit board 40 and ground it.

  The second piece 35b is a rectangular plate-like member that extends from the first piece 35a along the side end face 40a of the circuit board 40. In the present embodiment, the second piece 35b extends upward at a substantially right angle from a part of the side surface of the first piece 35a.

  The third piece 35c is a rectangular plate-like member that extends from the second piece 35b toward the circuit board 40 so as to face the first piece 35a. That is, the third piece portion 35c is substantially parallel to the first piece portion 35a. In the present embodiment, the third piece 35 c is located on the upper surface side of the circuit board 40 and serves as a holding rib that prevents the circuit board 40 from being lifted. In addition, it is also possible to provide a copper foil or the like at the portion that contacts the third piece 35c of the circuit board 40 and ground it.

  In the present embodiment, the third piece portion 35c is smaller than the first piece portion 35a, and the third piece portion 35d is located near the rear end of the first piece portion 35a when viewed from above. Accordingly, when the circuit board 40 is engaged with the fixing portion 35, the circuit board 40 can be inserted between the third piece portion 35c while moving along the first piece portion 35a from the front to the rear. And workability is good.

  The fourth piece portion 35d is a rectangular plate-like member that extends obliquely upward from an end portion in the direction in which the first piece portion 35a of the third piece portion 35c extends. In the present embodiment, the fourth piece 35d extends obliquely upward and forward from the front end of the third piece 35c. As a result, when the circuit board 40 is engaged with the fixing portion 35, the circuit board 40 is first moved along the fourth piece 35d from the upper front and then moved backward along the first piece 35a. By doing so, the circuit board 40 can be inserted between the first piece part 35a and the third piece part 35c, and the workability is good.

  Then, as shown in FIG. 4A or 4B, the circuit board 40 is sandwiched between the first piece 35a and the third piece 35c. When not grounding with the fixing | fixed part 35, the design which pinches | interposes with some margins may be sufficient. That is, the length (height) of the second piece 35b is designed to be slightly larger than the thickness of the circuit board 40. On the other hand, when grounding at the fixing portion 35, it is desirable to tightly hold the circuit board 40 between the first piece portion 35a and the third piece portion 35c. That is, the length (height) of the second piece 35b is designed to be substantially the same as the thickness of the circuit board 40.

  As described above, by using the fixing portion 35, the number of components can be reduced and the cost can be reduced as compared with the case where the circuit board is fixed only by screwing. Further, since the circuit board 40 can be inserted into the fixing portion 35 along the fourth piece portion 35d and the first piece portion 35a, workability is improved.

  Further, the circuit board 40 is positioned by the second piece 35 b in the left-right direction and is positioned by the back surface 32 in the front-rear direction. As a result, the screw holes 38 and 39 and the screw holes 40b and 40c of the circuit board overlap with each other, so that the screws can be fixed immediately and the workability is good.

  Further, since the circuit board 40 is fixed by the front two screws and the rear end fixing portion 35, the circuit board 40 is prevented from being lifted by the heat dissipation sheet located near the center of the circuit board 40.

  In addition, you may make it a 2nd piece part extend below besides extending upward like the said embodiment. When the second piece extends downward, the first piece serves as a holding rib, and the third piece serves as a pedestal. In this case, in order to make it easy to insert the circuit board 40, it is desirable to make the third piece larger than the first piece.

  It is sufficient that the fixing portion 35 is provided at at least one place, but if two places are provided, the positioning and fixing of the circuit board 40 are more reliable. When two fixing portions 35 are provided, for example, the support portion 36 may be omitted, and a fixing portion having a shape symmetrical to the fixing portion 35 may be provided near the other corner of the rear end of the circuit board 40.

  FIG. 5A is a perspective view of another form of the chassis of the HDD-integrated optical disk apparatus 10, and FIG. 5B is an enlarged view of a portion surrounded by a circle in FIG. 5A. FIG. 6 is a perspective view of the chassis of FIG. 5A as viewed from the lower surface side.

  The main difference between the chassis 50 of the present embodiment and the chassis 30 of the above embodiment is the structure of the fixing portion 55. Therefore, the fixing portion 55 will be described in detail below, and the other structures corresponding to the chassis 30 will be described. Briefly described.

  The chassis 50 includes a bottom surface portion 51, a back surface portion 52, side surface portions 53 and 53, and a front surface portion 54.

  Then, a part of the back surface portion 52 is cut and further bent to form a fixing portion 55 that is a fixing structure for the circuit board 40. The fixing portion 55 is located near the corner at the rear end of the circuit board 40. Further, a part of the back surface portion 52 is cut and further bent to form a support portion 56 that supports the lower surface of the circuit board 40. The support 56 is located near the other corner of the rear end of the circuit board 40 and may be used as a ground for the circuit board 40. Further, a heat radiating sheet mounting base 57 and screw holes 58 and 59 are formed on the bottom surface portion 51.

  As shown in FIG. 5B, the fixing portion 55 includes first to fourth piece portions 55 a to 55 d formed by bending the chassis 50. The first piece portion 35a is a rectangular plate-like member that extends (projects) at a substantially right angle from the back surface portion 52 that is a wall portion of the chassis 50 substantially perpendicular to the circuit board 40 to the circuit board 40 side. In the present embodiment, the first piece 55 a is located on the lower surface side of the circuit board 40 and serves as a pedestal part that supports the circuit board 40 apart from the bottom surface part 51 of the chassis 50. The pedestal also serves to prevent contact (short circuit) with the bottom surface 51 of the chassis 50 when the circuit board 40 is bent. In addition, it is also possible to provide a copper foil or the like at the portion that contacts the first piece 55a of the circuit board 40 and ground it.

  The second piece 55b is a rectangular plate-like member extending from the first piece 55a along the side end surface of the circuit board 40. In the present embodiment, the second piece 55b extends upward at a substantially right angle from a part of the side surface of the first piece 55a.

  The third piece 55c is a rectangular plate-like member that extends from the second piece 55b toward the circuit board 40 so as to face the first piece 55a. That is, the third piece portion 55c is substantially parallel to the first piece portion 55a. In the present embodiment, the third piece 55 c is located on the upper surface side of the circuit board 40 and serves as a holding rib that prevents the circuit board 40 from being lifted. In addition, it is also possible to provide a copper foil or the like at a portion that contacts the third piece 55c of the circuit board 40 and ground it.

  In the present embodiment, the third piece 55c is smaller than the first piece 55a, and the third piece 55d is located near the left end of the first piece 55a when viewed from above. Thus, when the circuit board 40 is engaged with the fixing portion 55, the circuit board 40 is inserted between the third piece portion 55c while being along the first piece portion 55a from the right side to the left side. Can work, and workability is good.

  The fourth piece 55d is a rectangular plate-like member that extends obliquely upward from the end in the direction in which the third piece 55c extends. In the present embodiment, the fourth piece 55d extends obliquely upward to the right from the right end of the third piece 55c. Accordingly, when the circuit board 40 is engaged with the fixing portion 55, the circuit board 40 is first moved along the fourth piece portion 55d from the upper right and then moved to the left along the first piece portion 55a. By doing so, the circuit board 40 can be inserted between the first piece part 55a and the third piece part 55c, and workability is good.

  Then, the circuit board 40 is sandwiched between the first piece portion 55a and the third piece portion 55c. When not grounding with the fixing | fixed part 55, the design which pinches | interposes with some margins may be sufficient. In other words, the length (height) of the second piece 55b is designed to be slightly larger than the thickness of the circuit board 40. On the other hand, when grounding at the fixing portion 35, it is desirable to tightly hold the circuit board 40 between the first piece portion 55a and the third piece portion 55c. That is, the length (height) of the second piece 55b is designed to be substantially the same as the thickness of the circuit board 40.

  Thus, by using the fixing portion 55, the number of parts can be reduced and the cost can be reduced as compared with the case where the circuit board is fixed only by screwing. Moreover, since the circuit board 40 can be inserted in the fixing part 35 along the 4th piece part 55d and the 1st piece part 55a, workability | operativity improves.

  Further, the circuit board 40 is positioned in the left-right direction by the second piece 55 b and positioned in the front-rear direction by the back surface 52. As a result, the screw holes 58 and 59 and the screw holes 40b and 40c of the circuit board overlap each other, so that the screws can be fixed immediately and the workability is good.

  In addition, since the circuit board 40 is fixed by the front two screws and the rear end fixing portion 55, the circuit board 40 is prevented from being lifted by the heat dissipation sheet located near the center of the circuit board 40.

  In addition, you may make it a 2nd piece part extend below besides extending upward like the said embodiment. When the second piece extends downward, the first piece serves as a holding rib, and the third piece serves as a pedestal. In this case, in order to make it easy to insert the circuit board 40, it is desirable to make the third piece larger than the first piece.

  In addition, it is sufficient that the fixing portion 55 is provided at least at one place. However, if two places are provided, the positioning and fixing of the circuit board 40 becomes more reliable. When two fixing portions 55 are provided, for example, the support portion 56 may be omitted, and a fixing portion having a shape symmetrical to the fixing portion 55 may be provided in the vicinity of the other corner of the rear end of the circuit board 40.

  After the circuit board 40 is assembled to the chassis 30 and 50 as described in the above two embodiments, a rear panel (not shown) is attached. A plurality of jacks for inputting and outputting video and audio signals are attached to the rear end of the circuit board 40 so as to protrude from the chassis 30 and 50.

  Conventionally, there is no structure for fixing the circuit board to the rear end of the chassis. With the circuit board attached to the chassis, the rear end of the circuit board is slightly lifted by the heat dissipation sheet, and the jack is also lifted. Therefore, conventionally, the rear panel is provided with a rib for holding the circuit board on the rear panel, and the rear panel is attached while holding the circuit board. However, it is difficult to fit the jack into the jack insertion hole of the rear panel. Therefore, conventionally, it has been necessary to enlarge the jack insertion hole of the rear panel. Therefore, the jack was off-centered with respect to the jack insertion hole.

  On the other hand, according to the present invention, the fixing portions 35 and 55 are provided in the chassis 30 and 50, so that the circuit board 40 is not lifted up, and the rear panel is provided with a rib for holding the circuit board or the jack insertion hole of the rear panel. The rear panel can be easily attached without increasing the size of the jack, and the jack is not off-centered with respect to the jack insertion hole. Further, since the adhesion between the heat dissipation sheet and the circuit board 40 is improved, the heat dissipation performance is good. Further, since the circuit board 40 does not float, the effect of grounding can be obtained stably.

  The present invention can be used for various electric devices, and in particular, can be effectively used for a reproducing apparatus such as an optical disk apparatus, a recording / reproducing apparatus, and a recording / reproducing apparatus such as a hard disk apparatus. Further, the present invention can also be used for a television set, a set top box, a multi-function device in which a plurality of reproducing units or recording / reproducing units are incorporated in one housing, for example, an HDD integrated optical disk device. It can also be used for a television receiver incorporating one or more reproducing units or recording / reproducing units.

10 HDD integrated optical disk device (recording medium playback device)
11 Display Device 12 External Device 13 Remote Control 15 Antenna 16 Tuner 17 Video / Audio Compression / Expansion Unit 18 HDD Recording / Reproducing Unit 19 BD / DVD Recording / Reproducing Unit 20 OSD Unit 21 Video Output Unit 22 Audio Output Unit 23 Memory 24 Remote Control Receiver 25 External I / F
26 Control section 30, 50 Chassis 31, 51 Bottom section 32, 52 Rear section 33, 53 Side section 34, 54 Front section 35, 55 Fixed section (fixed structure)
36, 56 Support part 37, 57 Radiation sheet installation base 38, 39, 58, 59 Screw hole 40 Circuit board 40a Side end face

Claims (8)

In the fixing structure of the circuit board provided in the chassis,
A first piece extending from the wall of the chassis substantially perpendicular to the circuit board toward the circuit board at a substantially right angle; and a second piece extending from the first piece along the side end surface of the circuit board. A piece, and a third piece extending from the second piece to the circuit board side so as to face the first piece,
The circuit board fixing structure, wherein the circuit board is sandwiched between the first piece part and the third piece part.   2. The circuit board fixing structure according to claim 1, wherein the third piece portion is positioned on an upper surface side of the circuit board and is smaller than the first piece portion.   The circuit board fixing structure according to claim 2, further comprising a fourth piece extending obliquely upward from an end of the third piece.   4. The circuit board fixing structure according to claim 3, wherein the end of the third piece is an end in a direction in which the first piece extends.   4. The circuit board fixing structure according to claim 3, wherein the end of the third piece is an end in a direction in which the third piece extends.   6. The circuit board fixing structure according to claim 1, wherein the chassis is a sheet metal member, and the first to third pieces are formed by bending.   The circuit board fixing structure according to claim 6, wherein the circuit board is sandwiched between the first piece and the third piece.   A recording medium reproducing device having the circuit board fixing structure according to claim 1.

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