Optical disc drive

Abstract

Provided is an optical disk drive (1) having a small number of components. The optical disk drive (1) comprises: a turntable (30) for rotating an optical disk; a chuck pulley (15); a top frame (10) having an opening (10a) formed at a position overlapping the chuck pulley (15) in a plan view; and a first arm (141) that holds the chuck pulley (15). The first arm (141) comes into contact with a first guide (101) of the opening (10a) and changes, in accordance with the contact position with the first guide (101), the attitude so as to move the chuck pulley (15) between a standby position and a chuck position for holding the optical disk with the turntable (30).

Description

[Technical Field]

[0001] The present invention relates to optical disc drives. [Background technology]

[0002] The following Patent Documents 1 to 3 disclose optical disc drives that can be mounted on electronic devices such as game consoles, personal computers, AV equipment, etc. The optical disc drive has a transport roller that comes into contact with an optical disc inserted through an insertion slot formed on the front surface of the drive and transports the optical disc to the position of a spindle motor, and a chuck pulley that magnetically fixes the optical disc to the spindle motor once it has reached the position of the spindle motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-022780 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-022779 [Patent Document 3] US Patent Application Publication No. 2006 / 0209662 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, the optical disk drive has a mechanism for moving the chuck pulley up and down to fix or separate the chuck pulley from the spindle motor, and realizing this mechanism may require a large number of parts.

[0005] An object of the present invention is to provide an optical disk drive with a small number of parts. [Means for solving the problem]

[0006] The optical disc drive of the present disclosure comprises a turntable for rotating an optical disc, a chuck pulley, a top frame having an opening formed at a position overlapping the chuck pulley in a planar view, and a first arm for holding the chuck pulley, the first arm including an inclined surface at its lower part, which contacts a first edge of the opening and changes its posture depending on the contact position of the inclined surface with respect to the first edge to move the chuck pulley between a standby position and a chuck position where the optical disc is clamped together with the turntable. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing the internal structure of an optical disc drive according to an embodiment of the present invention. [Figure 2A] FIG. 2 is an exploded perspective view showing a top frame and components attached to the top frame. [Figure 2B] FIG. 10 is an exploded perspective view showing a pulley holding mechanism; [Figure 3A] 3A and 3B are diagrams schematically illustrating the configuration and operation of a first arm. [Figure 3B] 3A and 3B are diagrams schematically illustrating the configuration and operation of a first arm. [Figure 3C] FIG. 4 is a diagram schematically illustrating the configuration of a second arm. [Figure 4A] FIG. 2 is a top view of the top frame in a standby state. [Figure 4B] 4B is a cross-sectional view showing a cross section taken along the HH cutting line in FIG. 4A. FIG. [Figure 5A] FIG. 10 is a top view of the top frame in a standby state, with the chuck pulley omitted; [Figure 5B] FIG. 5B is a cross-sectional view showing a cross section taken along line MM in FIG. 5A. [Figure 5C] FIG. 5B is a cross-sectional view showing a cross section taken along the line KK in FIG. 5A. [Figure 6A] FIG. 10 is a top view of the top frame in a state where the chuck pulley is tilted due to rotation of the first arm. [Figure 6B] 6B is a cross-sectional view showing a cross section taken along the line AA in FIG. 6A. [Figure 7A] FIG. 10 is a top view of the top frame in a state in which the chuck pulley is tilted due to rotation of the first arm, with the chuck pulley not shown. [Figure 7B] 7B is a cross-sectional view showing a cross section taken along the line BB in FIG. 7A. [Figure 7C] 7B is a cross-sectional view showing a cross section taken along line CC in FIG. 7A. FIG. [Figure 8A] FIG. 10 is a top view of the top frame in a chucked state. [Figure 8B] 8B is a cross-sectional view showing a cross section taken along line UU in FIG. 8A. [Figure 9A] FIG. 10 is a top view of the top frame in a chuck state, with the chuck pulley omitted. [Figure 9B] 9B is a cross-sectional view showing a cross section taken along the RR cutting line in FIG. 9A. FIG. [Figure 9C] 9B is a cross-sectional view showing a cross section taken along the PP cutting line in FIG. 9A. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the drawings. In the following description, X1 and X2 shown in the drawings will respectively denote the right and left directions, Y1 and Y2 will respectively denote the front and rear, and Z1 and Z2 will respectively denote the top and bottom. In this embodiment, an example is shown in which an optical disc is inserted into the optical disc drive 1 from the front toward the rear. In this embodiment, the direction in which the rotation axis O (see FIG. 4B) of the turntable 30 extends is the up-down direction. Also, in this embodiment, clockwise rotation as viewed from above is defined as clockwise, and leftward rotation as viewed from above is defined as counterclockwise.

[0009] [Optical disk drive 1 configuration overview] Fig. 1 is a perspective view showing the internal structure of an optical disc drive according to this embodiment. Fig. 2A is an exploded perspective view showing a top frame and components attached to the top frame. Fig. 2B is an exploded perspective view showing a pulley holding mechanism. Although not shown, the optical disc drive 1 may have an exterior case that houses the structure shown in Fig. 1.

[0010] The optical disc drive 1 is a device that reads information stored on an optical disc using a laser beam or the like. As shown in FIG. 1, an insertion slot S into which an optical disc is inserted is formed at the front of the optical disc drive 1. An optical disc is an information recording medium such as a CD, DVD, or Blu-Ray Disc (registered trademark). The optical disc drive 1 is preferably compatible with optical discs with a diameter of, for example, 12 cm. The optical disc drive 1 is housed in a cabinet of an electronic device such as a game console, personal computer, or AV equipment. Alternatively, the optical disc drive 1 may be configured to be detachable from the electronic device.

[0011] The optical disc drive 1 has a top frame 10 and a bottom frame 20. The top frame 10 is attached to the upper side of the bottom frame 20. The top frame 10 is preferably a metal plate. The bottom frame 20 is preferably box-shaped and made of a resin material. A notch is formed in the front of the bottom frame 20, and the notch and the top frame 10 form an insertion slot S.

[0012] The optical disc drive 1 also has a base frame that is disposed below the top frame 10 and inside the bottom frame 20, and that holds a turntable 30 (see FIG. 4B). An optical disc inserted through the insertion slot S is disposed between the top frame 10 and the base frame that is disposed inside the bottom frame 3. The turntable 30 may be, for example, a spindle motor that rotates the optical disc.

[0013] [Configuration overview of optical disk drive 1: Top frame 10] 2A, the top frame 10 is a metal plate that has been processed to have openings and irregularities formed therein. Specifically, the top frame 10 is formed with an opening 10a, guide holes h1 to h4, a guide portion 10G, and the like.

[0014] Opening 10a is a through hole for moving chuck pulley 15 in the up and down direction. Opening 10a is formed at a position overlapping with chuck pulley 15 in a plan view (top view). Guide portions 101 and 102 that come into contact with first arm 141 and second arm 142 (described later) are formed on the edge of opening 10a. Guide portion 101, which is the first edge, is a portion that changes the posture of first arm 141 (described later), and guide portion 102, which is the second edge, is a portion that changes the posture of second arm 142 (described later).

[0015] Guide portions 101 and 102 are shaped to extend along the rotation direction of annular portion 140, which will be described later, and guide portion 101 is shorter than guide portion 102. Guide portions 101 and 102 are preferably portions formed by so-called hemming. That is, guide portions 101 and 102 are preferably portions formed of two-layer plates formed by bending a portion of top frame 10 made of sheet metal.

[0016] The guide holes h1 to h3 are through holes that guide the movement of the switch arm 11. The guide hole h4 is a through hole that guides the rotation of the rotary arm 13.

[0017] As shown in FIG. 1, a top frame 10 has, on its upper surface, a switch arm 11, a switch board 12, a rotary arm 13, a pulley holding mechanism 14, a chuck pulley 15, and the like.

[0018] [Configuration overview of optical disk drive 1: switch arm 11] The switch arm 11 is located on the left and rear of the top frame 10, and has a generally arcuate shape that curves along the outer edge of the top frame 10. The switch arm 11 is rotatable around a supported portion 11a supported by the top frame 10 as a rotation axis.

[0019] As shown in FIG. 2A, the switch arm 11 has a contact portion 111 that protrudes downward from the top frame 10 through a guide hole h1 formed in the top frame 10, and a contact portion 112 that protrudes downward from the top frame 10 through a guide hole h2 formed in the top frame 10. The switch arm 11 also has a contact portion (not shown in FIG. 2A) that protrudes downward from the top frame 10 through a guide hole h3. The contact portions 111 and 112 move along the shapes of the guide holes h1 and h2 when they come into contact with the edge of an optical disc inserted through the insertion slot S. This causes the switch arm 11 to rotate counterclockwise around the supported portion 11a as the rotation axis. The switch arm 11 also has a biasing spring 11c attached to it that biases the switch arm 11 in the clockwise direction.

[0020] The switch arm 11 has a switch operating portion 11b on the rear right side thereof. The switch operating portion 11b is shaped to press a switch mounted on the switch board 12 when the switch arm 11 rotates counterclockwise around the supported portion 11a as a rotation axis.

[0021] [Configuration overview of optical disk drive 1: switch board 12] The switch board 12 is located at the right rear of the top frame 10. A start switch 12a and a stop switch 12b are mounted on the switch board 12. The start switch 12a is located behind the stop switch 12b.

[0022] [Configuration overview of optical disk drive 1: rotary arm 13] The rotary arm 13 is located in front of the switch board 12. The rotary arm 13 is disk-shaped and is provided rotatably around a supported portion 13a supported by the top frame 10 as a rotation axis. The rotary arm 13 has a contact portion that protrudes below the top frame 10 through a guide hole h4 formed in the top frame 10. When the edge of an optical disc inserted through the insertion slot S comes into contact with this contact portion, the rotary arm 13 rotates counterclockwise around the supported portion 13a as a rotation axis. The rotary arm 13 also has a protrusion 13b on its outer periphery. A biasing spring 13c is attached to the inside of the rotary arm 13. The biasing spring 13c biases the rotary arm 13 in the clockwise direction.

[0023] [Optical disk drive 1 configuration overview: Chuck pulley 15] 2A, the chuck pulley 15 has an upper flange 15a and a lower flange 15b that protrude radially from its outer periphery. The upper flange 15a is formed at the upper end of the chuck pulley 15, and the lower flange 15b is formed at the lower end of the chuck pulley 15.

[0024] The chuck pulley 15 is a member for fixing an optical disc to the turntable 30. The optical disc is held between the chuck pulley 15 and the turntable 30 as the chuck pulley 15 is attracted to the turntable 30 by magnetic force. This causes the optical disc to rotate integrally with the turntable 30. The chuck pulley 15 may be made of a magnetic material, or may include a magnet in part.

[0025] [Outline of the optical disk drive 1 configuration: pulley holding mechanism 14] As shown in FIG. 2B, the pulley holding mechanism 14 includes an annular portion 140, a first arm 141, and a second arm 142.

[0026] The annular portion 140 is annular, has a protrusion 140a on its outer periphery, and rotates when the protrusion 140a comes into contact with the protrusion 13b of the rotary arm 13. Specifically, when the rotary arm 13 rotates counterclockwise, the protrusion 13b comes into contact with the protrusion 140a, causing the annular portion 140 to rotate clockwise.

[0027] The annular portion 140 also has rail portions 140b formed on its outer periphery along the circumferential direction. The rail portions 140b function as guide rails that guide the rotation of the annular portion 140. The rail portions 140b are formed to be slidable relative to guide portions 10G (see FIG. 2A) formed on the top frame 10. The guide portions 10G protrude upward and have a shape that is bent at their upper ends radially inward of the annular portion 140. Due to this shape, the guide portions 10G mesh with the rail portions 140b. FIG. 2A shows an example in which four guide portions 10G are formed on the top frame 10, and rail portions 140b are formed on the annular portion 140 to correspond to the guide portions 10G.

[0028] The first arm 141 and the second arm 142 are members that move the chuck pulley 15 between the standby position and the chucking position. The first arm 141 and the second arm 142 are disposed opposite each other across the opening 10a. The first arm 141 and the second arm 142 are rotatably supported by the annular portion 140. As the annular portion 140 rotates, the contact positions of the first arm 141 and the second arm 142 with the guide portions 101 and 102 formed on the top frame 10 change, thereby changing the posture of the first arm 141 and the second arm 142 so as to move the chuck pulley 15 between the standby position and the chucking position.

[0029] Here, the chuck position is the position of the chuck pulley 15 that clamps the optical disc together with the turntable 30, and the standby position is the position of the chuck pulley 15 that is farther away from the turntable 30 than the chuck position. In other words, the standby position is a position above the chuck position. The configurations and operations of the first arm 141 and the second arm 142 will be described in detail later.

[0030] [Optical disc drive configuration overview: bottom frame] The bottom frame 20 holds a transport roller 21, an electric motor (not shown), and the like. The motor is provided so as to be electrically connectable to a switch board 12 (described later) via wiring. The transport roller 21 rotates based on power from the motor. The transport roller 21 contacts the underside of the optical disc and transports the optical disc in the front-to-rear direction. Specifically, the transport roller 21, by its rotation, transports the optical disc inserted through the insertion slot S to a position where the center of the optical disc coincides with the rotation center of the turntable 30. Furthermore, when the optical disc is removed from the optical disc drive 1, the transport roller 21, by its rotation, transports the optical disc from the position where the center of the optical disc coincides with the rotation center of the turntable 30 to the outside of the insertion slot S.

[0031] [Details of the configuration of the first arm 141 and the second arm 142] The configurations of first arm 141 and second arm 142 will be described in detail below, mainly with reference to FIG. 2B and FIG. 3A to FIG. 3C.

[0032] 3A and 3B are diagrams showing the configuration and operation of the first arm. FIG. 3C is a diagram showing the configuration of the second arm. FIG. 3A and 3B show the first arm 141 as viewed from the inside of the annular portion 140. FIG. 3C shows the second arm 142 as viewed from the inside of the annular portion 140.

[0033] Fig. 3A shows the operation of first arm 141 when an optical disc is inserted into optical disc drive 1. More specifically, the upper part of Fig. 3A shows the posture of first arm 141 in a standby state, the middle part of Fig. 3A shows the posture of first arm 141 when an optical disc is being inserted, and the lower part of Fig. 3A shows the posture of first arm 141 in a chuck state. Fig. 3B shows the operation of first arm 141 when an optical disc is removed from optical disc drive 1. That is, Fig. 3B shows the reverse operation of the operation shown in Fig. 3A.

[0034] In this embodiment, the standby state refers to the state of the optical disc drive 1 before an optical disc is inserted into the optical disc drive 1. The chucking state refers to the state of the optical disc drive 1 after the chuck pulley 15 has moved to the chucking position.

[0035] R1 in Fig. 3A indicates the clockwise direction, and R2 in Fig. 3B indicates the counterclockwise direction. Furthermore, H in Fig. 3A to Fig. 3C indicates the horizontal direction. In this embodiment, the horizontal direction H is the direction parallel to the surface of the optical disc inserted into the optical disc drive 1.

[0036] The first arm 141 and the second arm 142 are members that move the chuck pulley 15 in the up and down direction. In the standby state, the chuck pulley 15 is held by the first arm 141 and the second arm 142 so as to be located at a standby position away from the turntable 30. In the chuck state, the chuck pulley 15 is held by the first arm 141 and the second arm 142 so as to be located at a chuck position where the chuck pulley 15 rotates integrally with the turntable 30.

[0037] The first arm 141 includes a supported portion 1411 that is rotatably supported relative to the annular portion 140, an arm portion 1412 that extends from the supported portion 1411 along the inner circumferential surface of the annular portion 140, and a holding portion 1413 that is disposed more inward than the arm portion 1412 in the radial direction of the annular portion 140 and that holds the chuck pulley 15 by hooking a part of the upper flange 15a of the chuck pulley 15. The holding portion 1413 has a shape that extends along the circumferential direction of the annular portion 140.

[0038] 2B, the supported portion 1411 has a bearing portion 1411a. The annular portion 140 has a pair of support pins 1401b disposed in recesses 1401a formed on its inner surface. The supported portion 1411 is rotatably supported by the annular portion 140 as the support pins 1401b fit into the bearing portions 1411a.

[0039] Further, first arm 141 is biased by biasing spring S1 so that the tip side of arm portion 1412 tilts downward. In Figures 3A and 3B, the direction in which the biasing force of biasing spring S1 acts is indicated as f.

[0040] 3A, arm portion 1412 has a shape including protrusion 1412C that protrudes downward at its lower portion. In addition, inclined surface 1412S that constitutes protrusion 1412C is formed at the lower portion of arm portion 1412. Inclined surface 1412S is an inclined surface that slopes downward as it extends clockwise.

[0041] As shown in the upper part of Fig. 3A, the holding portion 1413 has a shape that inclines upward as it moves clockwise in the standby state. Also, as shown in the lower part of Fig. 3A, the holding portion 1413 has a shape that extends in the horizontal direction H in the chuck state. Note that it is preferable that the posture of the first arm 141 is restricted so that the extension direction of the holding portion 1413 does not tilt further downward from the horizontal direction H. Specifically, as shown in Fig. 2B, it is preferable that the arm portion 1412 of the first arm 141 is provided with a restricting protrusion 1412a that contacts the edge of the opening 10a of the top frame 10 to restrict the first arm 141 from tilting downward.

[0042] Similarly, the second arm 142 includes a supported portion 1421 that is rotatably supported relative to the annular portion 140, an arm portion 1422 that extends from the supported portion 1421 along the inner circumferential surface of the annular portion 140, and a holding portion 1423 that is disposed more inward than the arm portion 1422 in the radial direction of the annular portion 140 and that holds the chuck pulley 15 by hooking a part of the upper flange 15a of the chuck pulley 15. The holding portion 1423 has a shape that extends along the circumferential direction of the annular portion 140.

[0043] 2B, supported portion 1421 has bearing portion 1421a. Annular portion 140 has a pair of support pins 1402b disposed in recesses 1402a formed on its inner surface. Supported portion 1421 is rotatably supported by annular portion 140 as support pins 1402b fit into bearing portion 1421a.

[0044] Further, second arm 142 is biased by biasing spring S2 so that the tip side of arm portion 1422 tilts downward. In Fig. 3C, the direction in which the biasing force of biasing spring S2 acts is indicated as f.

[0045] 3C, arm portion 1422 has a shape including protrusion 1422C that protrudes downward at its lower portion. In addition, inclined surface 1422S that constitutes protrusion 1422C is formed at the lower portion of arm portion 1422. Inclined surface 1422S is an inclined surface that slopes downward as it extends clockwise.

[0046] The holding portion 1423 has a shape that tilts upward as it moves clockwise in the standby state. Furthermore, the holding portion 1423 has a shape that extends in the horizontal direction H in the chuck state. It is preferable that the posture of the second arm 142 is restricted so that the extension direction of the holding portion 1423 does not tilt further downward from the horizontal direction H. Specifically, as shown in FIG. 2B , the arm portion 1422 of the second arm 142 is provided with a restricting protrusion 1422a that contacts the edge of the opening 10a of the top frame 10 to restrict the second arm 142 from tilting downward.

[0047] Supported portion 1411 and supported portion 1421 are arranged so that the rotation axis of first arm 141 and the rotation axis of second arm 142 are parallel to each other. That is, support pin 1401b and support pin 1402b are shaped to extend parallel to each other. Furthermore, the rotation axis of first arm 141 and the rotation axis of second arm 142 extend in a direction along the surface of the optical disc inserted in optical disc drive 1. That is, support pin 1401b and support pin 1402b extend in a direction along the surface of the optical disc inserted in optical disc drive 1.

[0048] It is preferable that the first arm 141 and the second arm 142 are made of resin and have portions cut out, which allows for stable molding of the arms including the protruding portions and inclined surfaces.

[0049] [Details of the Operation of the First Arm 141 and the Second Arm 142] 2B and 3A to 3C, the operation of the first arm 141 and the second arm 142 will be described in detail below. The first arm 141 and the second arm 142 include inclined surfaces on their lower parts, and as the annular part 140 rotates, the contact positions of the inclined surfaces with the guide parts 101 and 102 of the top frame 10 change, thereby changing their postures.

[0050] 3A, in the standby state, the first arm 141 is supported on the upper surface of the top frame 10. Specifically, the protrusion 1412C of the first arm 141 is in contact with the guide portion 101 of the top frame 10.

[0051] 3A, the first arm 141 moves relative to the top frame 10. When the movement distance of the first arm 141 relative to the top frame 10 exceeds L1 (first movement distance), the protrusion 1412C falls off from above the guide unit 101 due to gravity and the biasing force of the biasing spring S1. Therefore, when the movement distance of the first arm 141 relative to the top frame 10 exceeds L1, the posture of the first arm 141 changes. Specifically, as shown in the middle part of FIG. 3A, the protrusion 1412C moves downward from the top frame 10. When the protrusion 1412C falls off from above the guide unit 101, the magnetic force acting between the chuck pulley 15 and the turntable 30 also contributes to the movement of the first arm 141.

[0052] Further rotation of the annular portion 140 causes the first arm 141 to move relatively to the guide portion 101 until the extension direction of the holding portion 1413 is aligned with the horizontal direction H, as shown in the lower part of FIG. 3A.

[0053] Second arm 142 operates in the same manner as first arm 141. However, the timing at which second arm 142 changes its posture is later than the timing at which first arm 141 changes its posture. That is, the movement distance L2 (second movement distance, see FIG. 3C ) until protrusion 1422C of second arm 142 falls off guide portion 102 is longer than the movement distance L1 until protrusion 1412C of first arm 141 falls off guide portion 101.

[0054] Therefore, the portion of the chuck pulley 15 held by the holding portion 1413 of the first arm 141 moves downward first, and assumes an inclined posture. Thereafter, the portion held by the holding portion 1423 of the second arm 142 moves downward, and the chuck pulley 15 is disposed at the chuck position. Therefore, compared to a configuration in which the operations of the first arm 141 and the second arm 142 are performed at the same time, impact noise when the chuck pulley 15 moves from the standby position to the chuck position is reduced.

[0055] Furthermore, when the chuck pulley 15 is in the chuck position, the first arm 141 and the second arm 142 are in a position where the holding portion 1413 and the holding portion 1423 extend in the horizontal direction H, respectively.

[0056] 3B, the operation of the first arm 141 when the chuck pulley 15 moves from the chucking position to the standby position will be described. The first arm 141 has an inclined surface 1412S, so that it can return to its original position.

[0057] As the annular portion 140 rotates counterclockwise as indicated by arrow R2 in FIG. 3B, the first arm 141 moves relative to the top frame 10. At this time, the inclined surface 1412S of the first arm 141 moves along the guide portion 101, and the first arm 141 moves in a direction opposite to gravity and the biasing force of the biasing spring S1. As a result, as shown in the middle part of FIG. 3B, the protrusion 1412C moves above the top frame 10. As the annular portion 140 moves further counterclockwise, the first arm 141 returns to the state shown in the bottom part of FIG. 3B.

[0058] 3C by the same operation as the first arm 141. However, the timing at which the protrusion 1422C of the second arm 142 is positioned on the guide portion 102 is earlier than the timing at which the protrusion 1412C of the first arm 141 is positioned on the guide portion 101. Therefore, the chuck pulley 15 is tilted from the chucking position and then moves to the standby position. Therefore, compared to a configuration in which the operations of the first arm 141 and the second arm 142 are performed at the same time, the impact noise generated when the chuck pulley 15 moves from the chucking position to the standby position is reduced.

[0059] [Overall operation] 4A to 9C, the operation of each mechanism when an optical disc is inserted into the insertion slot S in the optical disc drive 1 according to this embodiment will be described.

[0060] FIG. 4A is a top view of the top frame in a standby state. FIG. 4B is a cross-sectional view showing a cross section taken along the HH cutting line in FIG. 4A. FIG. 5A is a top view of the top frame in a standby state, with the chuck pulley omitted. FIG. 5B is a cross-sectional view showing a cross section taken along the MM cutting line in FIG. 5A. FIG. 5C is a cross-sectional view showing a cross section taken along the KK cutting line in FIG. 5A. FIG. 6A is a top view of the top frame in a state in which the chuck pulley is tilted due to rotation of the first arm. FIG. 6B is a cross-sectional view showing a cross section taken along the AA cutting line in FIG. 6A. FIG. 7A is a top view of the top frame in a state in which the chuck pulley is tilted due to rotation of the first arm, with the chuck pulley omitted. FIG. 7B is a cross-sectional view showing a cross section taken along the BB cutting line in FIG. 7A. FIG. 7C is a cross-sectional view showing a cross section taken along the CC cutting line in FIG. 7A. FIG. 8A is a top view of the top frame in a chucking state. Fig. 8B is a cross-sectional view showing a cut surface taken along the UU cutting line in Fig. 8A. Fig. 9A is a top view of the top frame in a chucked state, with the chuck pulley omitted. Fig. 9B is a cross-sectional view showing a cut surface taken along the RR cutting line in Fig. 9A. Fig. 9C is a cross-sectional view showing a cut surface taken along the PP cutting line in Fig. 9A.

[0061] Before an optical disc is inserted into the insertion slot S, each mechanism of the optical disc drive 1 is in a standby state shown in FIG. 4A.

[0062] In the standby state, as shown in Fig. 5B, the first arm 141 is supported by the guide portion 101 of the top frame 10. Therefore, the holding portion 1413 of the first arm 141 is located above the top frame 10. Similarly, as shown in Fig. 5C, the second arm 142 is supported by the guide portion 102 of the top frame 10. Therefore, the holding portion 1423 of the second arm 142 is located above the top frame 10.

[0063] Therefore, in the standby state, as shown in FIG. 4B, the pulley 15 is at the standby position, and a gap is formed between the pulley 15 and the turntable 30 to serve as a transport path for the optical disc.

[0064] First, the edge of the optical disc inserted into the insertion slot S pushes the contact portions 111 and 112 of the switch arm 11 to the left, causing the switch arm 11 to rotate counterclockwise around the supported portion 11a as the rotation axis. As a result, the switch operating portion 11b formed at the rear end of the switch arm 11 presses the start switch 12a on the switch board 12.

[0065] When the start switch 12a is pressed, a motor (not shown) housed in the bottom frame 20 starts to rotate. The rotational force of the motor is transmitted to the transport roller 21 via a gear train, which is a transmission mechanism. The rotation of the transport roller 21 transports the optical disc backward. The optical disc drive 1 has multiple gear trains and other transmission mechanisms, including those described below, but detailed explanations of their structures and operations will be omitted.

[0066] As the optical disc is transported, the edge of the optical disc strikes a contact portion that protrudes downward from the rotary arm 13, causing the rotary arm 13 to rotate counterclockwise. The rotational force of the rotary arm 13 is transmitted to the roller bracket that holds the transport roller 21 via a gear train, which is a transmission mechanism. As a result, the roller bracket moves to a retracted position that is downward away from the optical disc transport path.

[0067] The switch operating portion 11b formed at the rear end of the switch arm 11 rotates further counterclockwise and presses the stop switch 12b of the switch board 12, thereby stopping the rotation of the motor that drives the transport roller 21.

[0068] During this time, the convex portion 13b of the rotary arm 13, which has rotated counterclockwise, comes into contact with the convex portion 140a of the pulley holding mechanism 14, causing the annular portion 140 of the pulley holding mechanism 14 to rotate clockwise. Fig. 6A shows the state when the convex portion 13b comes into contact with the convex portion 140a, causing the annular portion 140 of the pulley holding mechanism 14 to rotate clockwise.

[0069] As the annular portion 140 rotates clockwise, the inclined surface 1412S of the first arm 141 moves relative to the guide portion 101 of the top frame 10. As a result, at least a portion of the first arm 141 is positioned below the top frame 10 (see FIG. 7B and the lower part of FIG. 3A). At this time, the second arm 142 remains supported on the guide portion 102 of the top frame 10, as shown in FIG. 7C.

[0070] As described above, while the posture of the first arm 141 changes, the posture of the second arm 142 is maintained from the standby state, so that the portion of the chuck pulley 15 held by the holding portion 1413 is tilted downward, as shown in FIG. 6B.

[0071] Further clockwise rotation of the annular portion 140 from the state shown in Fig. 7A results in the state shown in Fig. 8A. In this state, at least a portion of the second arm 142 is positioned below the top frame 10 (see Fig. 9C).

[0072] As a result of both the first arm 141 and the second arm 142 tilting downward, the chuck pulley 15 moves to the chucking position as shown in Fig. 8B. When the chuck pulley 15 moves to the chucking position, the chuck pulley 15 clamps the optical disc vertically by the magnetic force acting between it and the turntable 30. The optical disc becomes rotatable integrally with the turntable 30.

[0073] The configuration and operation of each mechanism described above is merely an example, and the configuration of each mechanism that operates before annular portion 140 starts to rotate is not limited to the above example. In other words, any other mechanism may be provided as long as it starts to rotate annular portion 140 when an optical disc is inserted. When an optical disc is removed from optical disc drive 1, the operations described above should be reversed.

[0074] Here, the switch arm 11 may be provided with a positioning portion 11d that positions the pulley holding mechanism 14 in the standby state. As shown in Fig. 4A, the positioning portion 11d may be a portion that protrudes toward the pulley holding mechanism 14 in the standby state and receives the biasing force of the biasing spring 11c to come into contact with the outer periphery of the annular portion 140 of the pulley holding mechanism 14. By adopting such a configuration, the pulley holding mechanism 14 can be positioned in the standby state without separately attaching a positioning spring or the like to the pulley holding mechanism 14. Note that, as shown in Fig. 4A, a recess 140d into which the positioning portion 11d fits in the standby state may be formed on the outer periphery of the annular portion 140.

[0075] In this embodiment, the postures of the first arm 141 and the second arm 142 are changed by contacting the edge of the opening in the top frame 10, eliminating the need for additional components for moving the arms and reducing the number of components. Furthermore, each of the first arm 141 and the second arm 142 includes an inclined surface at its lower portion, and changes its posture depending on the contact position of the inclined surface with the edge of the opening in the top frame 10. This allows the chuck pulley 15 to move downward without requiring a large amount of movement in the rotational direction of the annular portion 140. Furthermore, the top frame 10, which is made of sheet metal and has parts that contact the first arm 141 and the second arm 142 to operate the arms, is more durable than a plastic mechanism. Furthermore, in this embodiment, a configuration is adopted in which the chuck pulley 15 is moved to the chuck position by portions of the first arm 141 and the second arm 142 moving downward relative to the top frame 10. This allows for a thinner design compared to a configuration in which the entire mechanism for moving the chuck pulley up and down is located above the top frame 10.

[0076] Furthermore, in this embodiment, a configuration is adopted in which the chuck pulley 15 is moved to the chuck position by positioning a portion of the first arm 141 and the second arm 142 below the top frame 10, so the size of the opening 10a can be made smaller than in a configuration in which the entire mechanism for holding the chuck pulley is lowered downward, thereby maintaining the rigidity of the top frame 10.

[0077] [summary] For example, the optical disk drive can have the following configuration. (1) An optical disk drive having a turntable for rotating an optical disk, a chuck pulley, a top frame having an opening formed at a position overlapping the chuck pulley in a planar view, and a first arm for holding the chuck pulley, wherein the first arm includes an inclined surface at its lower part, contacts a first edge of the opening, and changes its posture depending on the contact position of the inclined surface with respect to the first edge to move the chuck pulley between a standby position and a chuck position where the chuck pulley is clamped together with the turntable. (2) In the optical disk drive according to (1), at least a portion of the first arm is disposed below the top frame when the chuck pulley is in the chuck position. (3) In (1) or (2), an optical disk drive having an annular portion that rotates in response to movement of the optical disk and supports the first arm, the first arm including a holding portion that extends along the circumferential direction of the annular portion and holds at least a portion of the chuck pulley. (4) In the optical disk drive according to (3), the annular portion has a rail portion formed on its outer periphery that slides along a guide portion formed on the top frame. (5) In the optical disk drive according to (3) or (4), a flange is formed on the upper end of the chuck pulley, and the holding portion is configured so that the flange is caught on it. (6) In any one of (3) to (5), the holding portion has a shape that extends in a direction parallel to the surface of the optical disk inserted into the optical disk drive when the chuck pulley is in the chuck position. (7) The optical disk drive according to any one of (3) to (6), wherein the holding portion is located below the top frame when the chuck pulley is in the chucking position. (8) The optical disk drive according to any one of (1) to (7), wherein the first arm is provided with a biasing spring that biases the tip side of the first arm so that it tilts downward. (9) In any one of (1) to (8), the top frame is made of sheet metal, and the first edge portion is made of a two-layer plate formed by bending a part of the sheet metal. (10) The optical disk drive according to any one of (1) to (9), wherein the first arm is a hollowed-out resin member. (11) An optical disk drive according to any one of (1) to (10), further comprising a second arm arranged opposite the first arm through the opening and holding the chuck pulley, the second arm contacting a second edge of the opening and changing its posture to move the chuck pulley between the standby position and the chuck position depending on the contact position with respect to the second edge. (12) In (11), an optical disk drive having a ring-shaped portion that rotates in response to insertion of the optical disk and supports the first arm and the second arm, the first arm moves on the first edge portion as the ring-shaped portion rotates, and when the movement distance exceeds a first movement distance, changes its posture to move the chuck pulley from the standby position to the chucking position, the second arm moves on the second edge portion as the ring-shaped portion rotates, and when the movement distance exceeds a second movement distance, changes its posture to move the chuck pulley from the standby position to the chucking position, the first movement distance being shorter than the second movement distance. (13) The optical disk drive according to (11) or (12), wherein the length of the first edge in the movement direction of the first arm is shorter than the length of the second edge in the movement direction of the second arm.

Claims

1. a turntable for rotating the optical disc; Chuck pulley and a top frame having an opening formed at a position overlapping the chuck pulley in a plan view; a first arm for holding the chuck pulley; and the first arm includes an inclined surface at its lower portion, and contacts a first edge portion of the opening, and changes its posture depending on the contact position of the inclined surface with respect to the first edge portion to move the chuck pulley between a standby position and a chuck position where the chuck pulley clamps the optical disk together with the turntable; Optical disc drive.

2. At least a portion of the first arm is disposed below the top frame when the chuck pulley is in the chuck position.

10. The optical disk drive of claim 1.

3. an annular portion that rotates in response to movement of the optical disc and supports the first arm; the first arm includes a holding portion that extends along the circumferential direction of the annular portion and holds at least a portion of the chuck pulley; 10. The optical disk drive of claim 1.

4. The annular portion has a rail portion formed on its outer periphery that slides against a guide portion formed on the top frame.

4. The optical disk drive of claim 3.

5. A flange is formed on the upper end of the chuck pulley, The holding portion is provided so that the flange is caught thereon.

4. The optical disk drive of claim 3.

6. the holding portion has a shape that extends in a direction parallel to the surface of the optical disc inserted into the optical disc drive when the chuck pulley is in a chucking position.

4. The optical disk drive of claim 3.

7. The holding portion is located below the top frame when the chuck pulley is in the chuck position.

4. The optical disk drive of claim 3.

8. The first arm is provided with a biasing spring that biases the tip side of the first arm so that it tilts downward.

10. The optical disk drive of claim 1.

9. The top frame is made of sheet metal, The first edge portion is composed of a two-layer plate formed by bending a part of the sheet metal.

10. The optical disk drive of claim 1.

10. The first arm is a hollowed-out resin member.

10. The optical disk drive of claim 1.

11. a second arm that is disposed opposite the first arm across the opening and that holds the chuck pulley; the second arm contacts a second edge portion of the opening and changes its posture to move the chuck pulley between the standby position and the chucking position depending on a contact position with the second edge portion; 10. The optical disk drive of claim 1.

12. a ring-shaped portion that rotates in response to insertion of the optical disc and supports the first arm and the second arm; the first arm moves on the first edge portion in accordance with the rotation of the annular portion, and when a movement distance exceeds a first movement distance, changes its posture so as to move the chuck pulley from the standby position to the chuck position; the second arm moves on the second edge portion in accordance with the rotation of the annular portion, and when the movement distance exceeds a second movement distance, changes its posture so as to move the chuck pulley from the standby position to the chuck position; The first movement distance is shorter than the second movement distance.

12. The optical disc drive of claim 11.

13. a length of the first edge portion in the movement direction of the first arm is shorter than a length of the second edge portion in the movement direction of the second arm; 13. The optical disc drive of claim 12.

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