JP2013109790A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device in which electric charge charged to a disk inserted into a body is prevented from being discharged to an optical detection element and a conductive portion.SOLUTION: A slide member 20 holding a disk D with a conveyance roller 15 is fixed to a lower side of a ceiling board 2d of a body 2. In the ceiling board 2d, a projection 8 for holding the slide member 20 is folded; a tip portion 8a of the projection 8 projects lower than an optical detection element 31a; and the tip portion 8a is positioned closer to an insertion portion 2e than the optical detection element 31a. The disk D inserted through the insertion portion 2e passes below the tip portion 8a before reaching the optical detection element 31a. Thus, electric charge charged to the disk D easily escapes from the projection 8 to the body 2 without being discharged to the optical detection element 31a.

Description

  The present invention relates to a disk device including a conductive protrusion that can release electric charges charged on a disk conveyed inside a housing.

  In a disk device loaded with a disk such as an optical disk, measures are required when a hand charged by static electricity approaches or when a charged disk is inserted.

  In the disk device described in Patent Document 1 below, a front ground is integrally formed on a conductive lower base forming the bottom surface of the disk device. When the operator's finger approaches the front bezel, the charge charged on the finger due to static electricity is released from the front ground to the lower base, and the recording medium and electronic components in the apparatus are protected.

  In the disc player described in Patent Document 2, the disc transport mechanism provided in the housing includes a metal arm member, a metal shaft supported by the arm member, and a conductive member provided on the outer periphery of the shaft. It is comprised with the roller formed with the property rubber material. According to the present invention, the electric charge charged on the disk can be released to the housing via the disk transport mechanism.

JP 2003-109371 A JP 2007-305172 A

  In the disk device described in Patent Document 1, since the front ground is provided on the front surface of the apparatus, it is possible to release the electric charge charged on the operator's finger, but the charged disk is in the apparatus. When inserted, it is difficult to let the disc charge escape from the front ground.

  The disc player described in Patent Document 2 cannot remove the charge until the charged disc reaches the roller. Therefore, an electronic element such as an optical detection element and a wiring layer to which a terminal of the electronic element or a terminal is connected are provided in a region between the insertion opening and the roller inside the housing, and these are connected to the disk being transported. If they are exposed to face each other, before the disk reaches the roller, electric charges are transmitted to electronic components, terminals or wiring layers, and there is a possibility that an integrated circuit mounted on the disk player may be damaged.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a disk device that can effectively remove the charge when the disk moving inside the housing is charged. Yes.

The present invention provides a housing in which an insertion portion, a transport mechanism for transporting a disc inserted from the insertion portion, and a rotation drive portion in which a central portion of the disc transported into the housing by the transport mechanism is installed. In the disk device provided with
An electronic element or a conductive part facing the moving disk and a conductive protrusion facing the moving disk are provided in the housing, and the disk heading to the rotation driving part is the electronic element. Or it passes the position which opposes the said projection part ahead of an electroconductive part, It is characterized by the above-mentioned.

  In the disk device of the present invention, since the disk moving in the housing faces the protruding part before the electronic element or the conductive part, when the disk is charged, the charge can be released to the protruding part, It becomes easy to prevent the electronic element or the conductive part from being affected by the electric charge.

  In the present invention, it is preferable that the protrusion is located at a position facing the surface of the disk when the center of the disk is installed on the rotation driving unit.

  In this disk device, even when the disk is charged during rotation, the charge can be released to the protrusions.

  For example, the electronic element is an optical detection element that detects the passage of a disk, and the conductive portion is a terminal of the optical detection element or a wiring layer to which the terminal is connected.

  In the present invention, the transport mechanism includes a transport roller and a sliding member made of a synthetic resin material that sandwiches the disk between the transport rollers, and the protruding portion supports the sliding member. And the sliding member is held by the protrusion.

  By using the protrusions for holding the sliding member to release the electric charge charged on the disk, the number of protrusions can be reduced and the structure can be simplified.

  In the present invention, it is preferable that the tip of the protruding portion is located farther from the disk surface than the facing surface of the sliding member facing the disk. Thereby, it is possible to avoid the disc from hitting the protrusion.

  Further, the electronic element or the conducting portion can be opposed to the disk through a window portion formed in the sliding member, and the electronic element or the conducting portion is more discreet than the tip of the protruding portion. It is preferable that it exists in the position away from the surface.

  As a result, static electricity charged on the disk easily escapes to the protrusions and hardly escapes to the electronic element or the conduction part.

  In the disk device of the present invention, since the disk inserted into the housing faces the conductive protrusions before the electronic element or the conductive part, the electric charge charged on the disk is transferred from the electronic element or the conductive part. It will be easier to escape to the protrusion. As a result, the electronic elements can be protected, and further, an integrated circuit mounted on the disk device can be protected.

The top view which shows the disc apparatus of embodiment of this invention, An exploded perspective view showing a part of a transport mechanism, a detection substrate and a housing of the disk device; The partial perspective view which shows the state with which the conveyance mechanism and detection board | substrate of the disc apparatus were assembled | attached to the housing | casing, FIG. 3 is a partial cross-sectional view taken along line IV-IV, Explanatory drawing which shows the positional relationship of a protrusion part and an optical detection element, and a disk,

  A disk device 1 shown in FIG. 1 has a metal housing 2. The housing 2 has a cubic shape, a front side plate 2a facing in the Y1 direction, a rear side plate 2b facing in the Y2 direction, both side plates 2c and 2c located on the left and right sides (X1 direction and X2 direction), a bottom surface and a ceiling plate 2d. FIG. 2 shows a part of the front plate 2a of the housing 2 and the front portion of the ceiling plate 2d, and FIG. 3 also shows a further part of the front portion of the ceiling plate 2d.

  As shown in FIG. 1, the operation panel 3 is fixed to the front side plate 2 a of the housing 2. On the front side surface 3a facing the Y1 direction of the operation panel 3, an insertion port extending in the lateral direction is opened. As shown in FIGS. 2 and 4, the insertion opening communicates with the internal space of the housing 2 through an insertion portion 2 e that opens in the front side plate 2 a of the housing 2. A display such as a liquid crystal display panel is provided on the front side surface 3a of the operation panel 3, and operation units 4a, 4b, 4c, and 4d are provided.

  The housing 2 has a size of 1 DIN or the like, and is embedded in an instrument panel or the like in the interior of a car. The operation panel 3 is installed so as to be exposed on the surface of the instrument panel.

  As shown in FIG. 1, inside the housing 2, the transport mechanism 10 is disposed inside the insertion portion 2 e, and the detection substrate 30 is disposed between the insertion portion 2 e and the transport mechanism 10.

  As shown in FIG. 1, a mechanism chassis 41 formed of a metal plate is provided inside the housing 2. The mechanism chassis 41 is elastically supported by a plurality of dampers 42 inside the housing 2. The damper 42 includes an oil damper, an air damper, a spring, or the like.

  A rotation drive unit 43 is provided at the center of the mechanism chassis 41. The rotation drive unit 43 includes a spindle motor fixed to the lower side of the mechanism chassis 41, a rotation shaft of the spindle motor protruding to the upper surface side of the mechanism chassis 41, a turntable fixed to the rotation shaft, and a turntable. And a clamper 44 for pressing the central portion of the installed disk D from above toward the turntable.

  The clamper 44 is rotatably supported by a rotation support portion 45a on the Y1 side of the clamp arm 45. The clamp arm 45 is formed of a metal plate, and bearings 45b and 45b provided on both sides on the back side of the apparatus (Y2 side) are rotatably supported by a support shaft provided in the mechanism chassis 41. Yes. A clamp spring 46 composed of a torsion spring is provided on the left side (X2 side) of the clamp arm 45. One arm portion 46a of the clamp spring 46 is hooked on the clamp arm 45, the other arm portion 46b is hooked on the mechanism chassis 41, and the clamp arm 45 uses the bearing portions 45b and 45b as fulcrums as a turntable. It is urged in the direction to press.

  A switching member 50 is provided inside the left side plate 2 c of the housing 2. The switching member 50 is reciprocated in the Y1-Y2 direction by a switching motor. On the switching member 50, a clamp control protrusion 51 protrudes upward (frontward in FIG. 1). In FIG. 1, when the switching member 50 moves in the Y2 direction, the lifting portion 45c of the clamp arm 45 is lifted by the clamp control protrusion 51, and the clamper 44 is released from the turntable and is in a clamp release state. When the switching member 50 moves in the Y1 direction and the clamp control projection 51 is disengaged from the lifting portion 45c, the clamp arm 45 is rotated by the clamp spring 46, and the clamper 44 is brought into pressure contact with the turntable and set in the clamped state. Is done.

  As shown in FIG. 2, the transport mechanism 10 provided in front of the housing 2 includes a roller mechanism portion 11 and a sliding member 20.

  The roller mechanism 11 has a roller support member 12. The roller support member 12 is formed of a metal plate. The roller support member 12 has a guide plate portion 12a and support plate portions 12b and 12b bent from both sides thereof. A support shaft 13 is fixed to each support plate portion 12b. The support shaft 13 is supported by the left and right side plates 2c, 2c of the housing 2, and the roller support member 12 is rotatable about the support shafts 13, 13.

  Behind the roller support member 12 (Y2 direction), the roller shaft 14 is rotatably supported by the left and right support plate portions 12b and 12b. A synthetic rubber conveyance roller 15 is mounted on the outer periphery of the roller shaft 14. A pair of transport rollers 15 are provided separately in the left-right direction (X1-X2 direction). Spring hooks 12c, 12c are integrally provided at the tip of Y1 side of the support plate parts 12b, 12b, and a biasing spring 16 is hung between each spring hook 12c and the bottom plate of the housing 2. . The urging spring 16 urges the roller support member 12 in a direction that pushes the transport roller 15 upward in FIG.

  The switching member 50 shown in FIG. 1 is provided with a roller control cam, the left end of the roller shaft 14 is engaged with the roller control cam, and the rotational force of the roller support member 12 is changed by the moving force of the switching member 50. Be controlled. When the switching member 50 moves in the Y2 direction in FIG. 1, the restraining force on the roller support member 12 is released, and the conveying roller 15 is lifted by the force of the biasing spring 16 as shown in FIG. The disk D can be sandwiched between the sliding member 20. When the switching member 50 moves in the Y1 direction, the conveying roller 15 is held at a position away from the sliding member 20 downward.

  As shown in FIG. 2, a pinion gear 17 is fixed to one end of the roller shaft 14. When the disk D is sandwiched between the transport roller 15 and the sliding member 20, the power of the motor is applied to the pinion gear 17, and the roller shaft 14 is driven to rotate.

  The sliding member 20 shown in FIG. 2 is made of a synthetic resin material. A recess 21 is formed on the lower surface (opposing surface) 20 a of the sliding member 20 so as to face the transport roller 15. The recess 21 is formed in a shape that follows the outer shape of the pair of transport rollers 15 and 15.

  A detection substrate 30 is attached to the upper surface 20 b of the sliding member 20. The detection board 30 is a printed wiring board, and optical detection elements 31a, 31b, and 31c, which are electronic elements, are mounted at three locations on the lower surface 30a. A wiring layer is formed on the lower surface 30a of the detection substrate 30, and the terminals of the optical detection elements 31a, 31b, and 31c are soldered to the respective wiring layers.

  A pair of positioning holes 32 a and 32 b are formed in the detection substrate 30. The sliding member 20 is integrally formed with a pair of positioning protrusions 22a and 22b protruding from the upper surface 20b. Further, latching claws 23a, 23b, 23c projecting from three places on the upper surface 20b of the sliding member 20 and latching claws 24a, 24b projecting from two places on the rear thereof are integrally formed. By inserting the positioning projections 22a and 22b into the positioning holes 32a and 32b, the detection substrate 30 is positioned on the upper surface 20b of the sliding member 20. Further, the front edge portions 33a, 33b, and 33c of the detection board 30 are hooked on the hooking claws 23a, 23b, and 23c, respectively, and the rear edge portion 34 of the detection board 30 is hooked on the hooking claws 24a and 24b, respectively. Thus, the detection substrate 30 is fixed to the upper surface 20 b of the sliding member 20.

  FIG. 3 shows a structure in which the positioning protrusion 22a is inserted into the positioning hole 32a, and a structure in which the front edge portion 33a is hooked on the hooking claw 23a and the rear edge portion 34 is hooked on the hooking claw 24a. Shown magnified.

  As shown in FIG. 2, when the detection window portions 25a, 25b, and 25c are opened in the sliding member 20, and the detection substrate 30 is fixed to the upper surface 20b of the sliding member 20, the optical detection element 31a becomes the detection window. The optical detection elements 31b and 31c are inserted into the detection window portions 25b and 25c.

  As shown in FIG. 2, transmission holes 18a, 18b, 18c are opened at three locations on the roller support member 12, the transmission holes 18a face the detection window 25a, and the transmission holes 18b, 18c are the detection window 25b. , 25c.

  The optical detection elements 31 a, 31 b, and 31 c are light receiving elements, and light emitting elements are provided at three positions below the roller support member 12. The detection light emitted from each light emitting element passes through the transmission holes 18a, 18b, 18c and the detection window portions 25a, 25b, 25c and is received by the optical detection elements 31a, 31b, 31c. When the disk D inserted from the insertion portion 2e moves to a position that blocks any one of the optical detection elements 31a, 31b, and 31c, the light reception output of the optical detection element is lowered and the disk detection state is set.

  The optical detection elements 31a, 31b, and 31c may be light emitting elements, and a light receiving element facing each of the optical detection elements 31a, 31b, and 31c may be provided below the roller support member 12. When the surface of the disk D has a reflecting surface, the optical detection elements 31a, 31b, and 31c detect the light emitted from the light emitting element and reflected from the reflecting surface by the light emitting element. It may have.

  The sliding member 20 is attached to the lower surface of the ceiling plate 2d of the housing 2 with the detection substrate 30 attached to the upper surface 20b.

  As shown in FIG. 2, a positioning recess 6 is formed in the front portion of the ceiling plate 2 d of the housing 2, and the support piece 7 is bent downward at a position separated rearward (Y2 direction) therefrom. . The protrusion 8 is bent downward at the front portion of the ceiling plate 2d, and the protrusions 9a, 9b, 9c are bent downward at three positions rearward (Y2 side).

  A positioning protrusion 26 is integrally formed on the upper surface 20b of the sliding member 20, and a latching portion 27 is integrally provided behind the positioning protrusion 26. Further, on the upper surface 20b of the sliding member 20, hooking projections 28 having a hook structure are integrally formed on the front side, and hooking projections 29a, 29b, 29c having the same hook structure are integrally formed on three rear sides. Has been.

  The positioning projection 26 of the sliding member 20 is inserted into the positioning recess 6 of the ceiling plate 2d, and the latching portion 27 is latched on the support piece 7 of the ceiling plate 2d. Further, the latching protrusions 28 of the sliding member 20 are latched on the projections 8 of the ceiling plate 2d, and the three latching projections 29a, 29b, 29c are the projections 9a, 9b, 9c of the ceiling plate 2d. Hanging on the top. Thereby, the sliding member 20 is positioned and fixed to the lower surface of the ceiling board 2d.

  FIG. 3 shows a structure in which the positioning projection 26 of the sliding member 20 is latched on the positioning recess 6 of the ceiling plate 2d, and the latching projection 28 of the sliding member 20 on the projection 8 of the ceiling plate 2d. The latched structure is shown enlarged.

  3 and 4 show a structure in which the sliding member 20 and the detection board 30 are attached to the lower surface of the ceiling plate 2d.

  As shown in FIGS. 2 and 3, the sliding member 20 has a hole 28 a penetrating vertically at a position adjacent to the latching protrusion 28. As shown in FIG. 4, the protrusion 8 bent downward at the front portion of the ceiling plate 2d is hooked on the lower side of the hooking protrusion 28 and enters the inside of the hole 28a. As a result, the tip 8 a of the protrusion 8 can be directly opposed to the upper surface of the disk D that is inserted from the insertion portion 2 e and faces the transport roller 15.

  As shown in FIG. 4, the tip 8 a of the protrusion 8 is positioned inside the hole 28 a of the sliding member 20, and the tip 8 a is below the lower surface (opposing surface) 20 a of the sliding member 20. It does not protrude and is located above the lower surface 20a by a height α. Therefore, the edge d1 of the disc D inserted into the housing 2 from the insertion portion 2e in the Y2 direction does not hit the tip 8a of the protrusion 8.

  The optical detection element 31 a is positioned inside a detection window portion 25 a formed on the sliding member 20, and can be opposed to the upper surface of the disk D that is inserted from the insertion portion 2 e toward the transport roller 15. However, as shown in FIG. 4, the tip 8a of the protrusion 8 is located below the lower surface of the optical detection element 31a by a distance β, and the distance between the upper surface of the disk D and the tip 8a is The distance is shorter than the distance between the upper surface of the disk D and the lower surface of the optical detection element 31a.

  As shown in FIG. 1, among the three optical detection elements 31a, 31b, and 31c mounted on the detection substrate 30, the optical detection element 31a located at the center is located closest to the Y1 side and is located closest to the insertion portion 2e. Close position. Of the protrusions 8, 9a, 9b and 9c bent from the ceiling plate 2d, the protrusion 8 is located closest to the Y1 side and is closest to the insertion portion 2e.

  4 and 5 show the positional relationship between the protrusion 8 and the optical detection element 31a. As shown in FIG. 4, the tip 8a of the protrusion 8 is located on the Y1 side with respect to the optical detection element 31a. Furthermore, the terminal of the optical detection element 31a and the wiring layer to which this terminal is soldered, etc. It is located on the Y1 side from the conductive portion. Then, as shown in FIG. 5A, when the disc D is inserted into the housing 2 from the insertion portion 2e, the edge d1 facing forward (Y2 direction) in the insertion direction of the disc D is first Then, it passes through a position facing the tip 8a of the projection 8 and then passes through a position facing the optical detection element 31a and further a position facing a conductive portion such as a terminal or a wiring layer.

  As shown in FIG. 1, when the central portion of the disk D is mounted on the rotation drive unit 43 and the disk D reaches the loading completion position (i), the protrusion 8 The leading end 8a is located on the Y2 side of the edge d2 facing the Y1 side of the disk D, and the leading end 8a always faces the upper surface of the disk D at the loading completion position (i).

Next, the operation of the disk device 1 will be described.
When the disk device 1 is waiting for the insertion of the disk D, the switching member 50 is moved in the Y2 direction by the power of the motor, and the clamper 44 is separated from the turntable in the rotation drive unit 43. Then, as shown in FIG. 4, the transport roller 15 approaches the lower surface 20 a of the sliding member 20, and the disk D can be sandwiched between the transport roller 15 and the sliding member 20.

  In addition, the optical detection elements 31a, 31b, and 31c provided at three locations on the detection substrate 30 are energized, and the passage of the disk D can be detected by these optical detection elements.

  When the edge d1 facing the Y2 direction of the disc D inserted from the insertion portion 2e passes through the detection area of the optical detection element 31a positioned closest to the Y1 side, it is determined that the disc D has been inserted by a control unit (not shown), The motor starts and the roller shaft 14 starts to rotate in the carry-in direction. When the edge d1 of the disk D touches the transport roller 15, the edge d1 is guided between the transport roller 15 and the lower surface 20a of the sliding member 20 by the rotational force of the transport roller 15, and the disk D is transported. And the sliding member 20 and are carried in the Y2 direction by the rotational force of the conveying roller 15.

  Here, as shown in FIG. 4, the edge d1 of the disk D inserted from the insertion portion 2e in the Y2 direction is formed on the protrusion 8 before passing through the optical detection element 31a, its terminal, or the wiring layer. Cross the tip 8a. At this time, if the electric charge is charged on the disk D due to static electricity, the electric charge is easily discharged to the protrusion 8 formed of a metal plate, and the electric charge can be released to the ceiling plate 2d.

  As shown in FIG. 5 (A), the disk D carried in the Y2 direction crosses the tip 8a of the protrusion 8 before approaching the conduction part such as the optical detection element 31a, its terminal and wiring layer, In addition, as shown in FIG. 4, since the tip 8a of the protrusion 8 is located below the optical detection element 31a, the electric charge of the disk D easily escapes to the protrusion 8, and the electric charge is detected optically. The phenomenon that the element 31a, its terminal, or the conductive portion such as the wiring layer is discharged is less likely to occur. Therefore, the optical detection element 31a can be protected, and further, it becomes easy to prevent the integrated circuit and other electronic components that are conducted through the wiring layer from being damaged by the discharge current.

  When the disk D sandwiched between the transport roller 15 and the sliding member 20 is carried in by the rotational force of the transport roller 15, the controller detects from the optical detection elements 31a, 31b, and 31c provided at three locations. The combination of outputs is monitored to determine whether the regular disk D is carried in or whether a foreign object having a shape different from that of the regular disk D is carried in. If it is determined that the regular disk D is loaded, the disk D is loaded to the loading completion position (i) shown in FIG. 1, and if it is determined that it is a foreign object, the roller shaft 14 rotates in the reverse direction. Is given, and the disk D is ejected from the insertion portion 2e.

  When the conveyance completion detection switch (not shown) detects that the regular disk D has been loaded to the loading completion position (i), the switching member 50 shown in FIG. 1 is moved in the Y1 direction by the power of the switching motor. Due to the moving force of the switching member 50 at this time, the clamp arm 45 is lowered toward the turntable, and the center portion of the disk D is sandwiched between the turntable and the clamper 44. Further, the roller shaft 14 is lowered by the moving force of the switching member 50 in the Y1 direction, and the conveying roller 15 is separated from the disk D. Furthermore, the mechanism chassis 41 in the housing 2 is unlocked by the moving force of the switching member 50 in the Y1 direction, and the mechanism chassis 41 is elastically supported by the damper 42.

  Then, the spindle motor of the rotational drive unit 43 is rotationally driven to rotationally drive the disk D, the optical head provided in the mechanism chassis 41 is started, and the data recorded on the disk D is reproduced and recorded.

  As shown in FIG. 5B, the tip 8a of the projection 8 faces the upper surface of the disk D installed at the loading completion position (i). Further, as shown in FIG. 4, the tip 8a of the protrusion 8 is positioned below the conductive portion such as the optical detection element 31a, its terminal, and a conductive pattern to which the terminal is soldered, and the protrusion 8 The distance from the leading end portion 8a to the upper surface of the disk D at the loading completion position (i) is shorter than the distance from the optical detection element 31a or the conducting portion to the upper surface of the disk D. Therefore, the electric charge charged on the disk D during the rotation is likely to be discharged toward the protruding portion 8 instead of the optical detecting element 31a or the conducting portion.

  When unloading the disk D from the disk device 1, the switching member 50 is moved in the Y2 direction, which is opposite to the loading direction, by the power of the switching motor. Due to the moving force of the switching member 50 at this time, the mechanism chassis 41 is restrained and locked inside the housing 2, the clamp arm 45 is lifted, and the clamper 44 moves away from the center of the disk D to clamp the disk D. Canceled. Further, the conveying roller 15 is lifted by the force of the biasing spring 16, and the disk D installed on the turntable is lifted by the conveying roller 15 and is sandwiched between the conveying roller 15 and the sliding member 20. At this time, the transport roller 15 is rotated in the unloading direction, and the disk D is unloaded from the insertion portion 2 e toward the outside of the housing 2.

  Even when the disk D is lifted from the turntable or after unloading of the disk is started, the protruding portion 8 faces the disk D. Therefore, the electric charge charged on the unloaded disk D becomes an optical detection element. It becomes easy to discharge toward the protrusion part 8 instead of 31a or a conduction | electrical_connection part.

  In the present invention, the electronic element protected by the protrusion 8 may be a circuit element other than the optical detection element 31a.

  Further, the protruding portion 8 may be bent from a metal plate different from the ceiling plate 2 d of the housing 2.

DESCRIPTION OF SYMBOLS 1 Disk apparatus 2 Case 2d Ceiling board 2e Insertion part 8 Protrusion part 8a Tip part 10 Conveyance mechanism 12 Roller support member 14 Roller shaft 15 Conveyance roller 20 Sliding member 25a, 25b, 25c Detection window part 28 Stop protrusion 28a Hole 30 Detection board 31a Optical detection element 41 Mechanism chassis 43 Rotation drive unit 50 Switching member D Disk d1, d2 Edge

Claims (6)

The housing is provided with an insertion section, a transport mechanism that transports the disk inserted from the insertion section, and a rotation drive section in which a central portion of the disk transported into the housing by the transport mechanism is installed. In the disk unit
An electronic element or a conductive part facing the moving disk and a conductive protrusion facing the moving disk are provided in the housing, and the disk heading to the rotation driving part is the electronic element. Alternatively, the disk device is characterized in that it passes through a position facing the protruding portion before the conductive portion.   The disk device according to claim 1, wherein when the central part of the disk is installed on the rotation driving unit, the protrusion is located at a position facing the surface of the disk.   3. The disk device according to claim 1, wherein the electronic element is an optical detection element that detects passage of the disk, and the conductive portion is a terminal of the optical detection element or a wiring layer to which the terminal is connected. The transport mechanism is composed of a transport roller and a sliding member made of a synthetic resin material that sandwiches a disk between the transport rollers,
4. The disk device according to claim 1, wherein the protrusion is bent from a metal plate that supports the sliding member, and the sliding member is held by the protrusion. 5.   The disk device according to claim 4, wherein a tip of the protrusion is located farther from the surface of the disk than a surface of the sliding member facing the disk.   The electronic element or the conducting portion can be opposed to the disk through a window portion formed in the sliding member, and the electronic element or the conducting portion is a surface of the disc rather than the tip of the protruding portion. 6. The disk device according to claim 4, wherein the disk device is located away from the disk device.

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