JP2006202365A - Disk positioning mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and surely center two kinds of large and small disks inserted in the apparatus at a prescribed position. <P>SOLUTION: A movable tray 4 elastically energized upward is arranged at a position opposed to a disk insertion port so as to be freely elevated and lowered; a 1st positioning groove 17 for positioning the small diameter disk SD and a 2nd positioning groove 18 for positioning the large diameter disk LD are formed with a step; a pair of 1st inclined planes and a pair of 2nd inclined planes are formed outside both of these 1st and 2nd positioning grooves 17, 18; both of the 1st inclined planes are made to continue from the front end face of the movable tray 4 up to the outer peripheral edge of the 1st positioning groove 17; both of the 2nd inclined planes are made to continue from the front end face of the movable tray 4 up to the outer peripheral edge of the 2nd positioning groove 18; and thus, the disk positioning mechanism is configured so as to smoothly guide the two kinds of small and large disks D up to the 1st and 2nd positioning grooves 17, 18 using the 1st and 2nd inclined planes as guide planes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk positioning mechanism for centering two types of large and small disks inserted from a disk insertion slot at predetermined play positions according to their sizes.

  In general, a CD player and a DVD player use two types of discs having a diameter of 12 cm and a diameter of 8 cm. In order to use one of these two types of discs together, After the disc inserted from the insertion slot is centered at a predetermined position, it needs to be chucked and played. At that time, since the distance from the center of the clamp to the outer periphery of the disc is different between the large-diameter disc having a diameter of 12 cm and the small-diameter disc having a diameter of 8 cm, the inserted disc is centered at a predetermined play position according to its size. The disc positioning mechanism is provided.

  Conventionally, as such a disc positioning mechanism, first guide grooves and second guide grooves having different sizes are formed on the disc guide plate in stages, and the disc guide plate is provided on a chassis or the like on the back side of the disc insertion slot. It is known that one of the large and small disks inserted from the disk insertion slot is regulated by fixing in the first or second guide groove of the disk guide plate (see, for example, Patent Document 1). ). Here, the first guide groove is set to have substantially the same groove width as the outer diameter of the small-diameter disk, a parallel portion extending partway from the front end surface of the disk guide plate, and a semicircular arc portion continuous to the parallel portion. It consists of and. Further, the second guide groove is set to have a groove width substantially the same as the outer diameter of the large-diameter disk, a parallel portion extending partway from the front end surface of the disk guide plate, and a semicircular arc portion continuous to the parallel portion. It consists of and. Furthermore, a guide slope is formed from the front side of both ends of the second guide groove to the middle of the parallel portion of the first guide groove, and the bottom surface of the first guide groove and the bottom surface of the second guide groove on the front end surface of the disk guide plate are Connected by a guide slope.

In a disc player equipped with such a disc positioning mechanism, for example, when a small-diameter disc is inserted onto the disc guide plate from the disc insertion slot, the movement of the small-diameter disc in the width direction is restricted by the parallel portion of the first guide groove. In response to the rotational force from the drive roller, the sheet is conveyed to the arc portion of the first guide groove and centered at the center of the clamp at this position. At that time, even if the small-diameter disk is inserted from a position offset to the left or right with respect to the center position of the disk insertion slot, the outer peripheral edge of the small-diameter disk abuts on the guide inclined surface to the parallel portion of the first guide groove. As a result, the small-diameter disk finally falls into the first guide groove and is conveyed to the arc portion. When a large-diameter disk is inserted onto the disk guide plate from the disk insertion slot, the large-diameter disk receives a rotational force from the driving roller while its movement in the width direction is restricted by the parallel portion of the second guide groove. It is conveyed to the arc portion of the second guide groove, and is centered on the clamp center at this position. When the small-diameter disk or the large-diameter disk is centered on the arc portion of the disk guide plate in this way, the drive roller is separated from the disk and the conveyance of the disk is stopped, and the disk is interposed between the turntable and the clamper. Chucked.
JP 2002-260315 A (page 3-4, FIG. 1)

  In the conventional disk positioning mechanism described above, a disk guide plate in which the first guide groove and the second guide groove are formed is fixed to a chassis or the like at the back of the disk insertion slot, and two types of large and small are used by using this disk guide plate. Since the disk is centered at a predetermined position according to the size, there is an advantage that the number of parts can be reduced and the structure can be simplified. However, since the first guide groove and the second guide groove are composed of a parallel portion that extends partway from the front end surface of the disc guide plate and a semicircular arc portion that continues to the parallel portion, If a large external vibration acts during chucking of the centered disc, the external vibration may cause the disc to move from the arc portion to the parallel portion, resulting in a centering deviation, resulting in a disc chucking failure. There was a problem.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to easily and reliably center the inserted two types of large and small discs at predetermined positions according to their sizes. It is to provide a disk positioning mechanism.

  The present invention uses a movable tray that can be moved up and down elastically biased upward, and a small-diameter disk positioning groove and a large-diameter disk positioning groove having different outer diameters are formed on the upper surface of the movable tray so as to be stepped up and down. At the same time, the first inclined surface and the second inclined surface that are continuous from the front end surface of the movable tray to the outer peripheral edges of both positioning grooves are formed.

  According to the disk positioning mechanism of the present invention, two types of large and small disks can be smoothly guided to the corresponding positioning grooves using the inclined surface formed on the front end surface of the movable tray as a guide surface. The disk is slightly pushed down by the contact between the outer peripheral edge of the disk and the inclined surface, and when the disk passes through the inclined surface, the disk returns upward due to the elastic biasing force, so that the disk gets over the inclined surface and enters the positioning groove to be centered. It will be. Therefore, even if a large external vibration is applied during chucking after centering, the in-plane movement of the disc is restricted by the peripheral wall of the arc-shaped positioning groove to prevent disc misalignment and ensure reliable chucking operation. Can be realized.

  The present invention provides a disk positioning mechanism for centering a large-diameter disk or a small-diameter disk inserted from a disk insertion slot to a play position, and a movable tray that is elastically biased upward to a position facing the disk insertion slot can be moved up and down. The small-diameter disk positioning groove and the large-diameter disk positioning groove having different outer diameters are formed on the upper surface of the movable tray so as to be different from each other, and the small-diameter disk positioning groove and the large-diameter disk positioning groove are formed. A pair of first inclined surfaces and a pair of second inclined surfaces are formed on both outer sides of the groove, respectively, and the first inclined surfaces are continuous from the front end surface of the movable tray to the outer peripheral edge of the small-diameter disk positioning groove. The second inclined surfaces are continuous from the front end surface of the movable tray to the outer peripheral edge of the large-diameter disk positioning groove.

  In the disk positioning mechanism configured as described above, the two types of large and small disks can be smoothly moved to the corresponding positioning grooves using the inclined surface (first inclined surface or second inclined surface) formed on the front end surface of the movable tray as a guide surface. At that time, the movable tray is slightly pushed down by the contact between the outer peripheral edge of the disk and the inclined surface, and when the disk passes through the inclined surface, the disk is returned upward by an elastic biasing force. The centering is carried out after entering the positioning groove. Therefore, even if a large external vibration is applied during chucking after centering, the in-plane movement of the disc is restricted by the peripheral wall of the arc-shaped positioning groove to prevent disc misalignment and ensure reliable chucking operation. Can be realized.

  In the above configuration, a pair of disc detection members that are movable while contacting the outer peripheral edge of the disc are disposed between the disc insertion opening and the front end surface of the movable tray, and the amount of movement of these disc detection members is determined. It is preferable that a restricting member having a different displacement amount is provided, and the downward movement amount of the movable tray is restricted according to the displacement amount of the restricting member. By adopting such a configuration, the amount of downward movement of the movable tray is regulated by the regulating member when the small-diameter disk is inserted, so that the small-diameter disk can be prevented from moving over the first inclined surface to the outer region. Therefore, the small-diameter disk can be reliably guided from both the first inclined surfaces to the small-diameter disk positioning groove.

  In this case, the restricting member may be a rotation type using a link mechanism or the like, but the restricting member is a restricting slider that can move in the front-rear direction, and the restricting member is in accordance with the amount of movement of the disc detecting member. If the restricting slider is configured to have different amounts of movement in the front-rear direction, for example, the restricting slider is provided with a deformed hole having a different depth dimension along the front-rear direction, and the deformed hole is provided on the side wall of the movable tray. By inserting the protruding pins, it is preferable that the downward movement of the movable tray can be selectively restricted as the restriction slider moves forward and backward.

  In the above configuration, the disc detection member may be of a slide type, but the disc detection member is a pair of detection levers that can rotate, and a swing lever is disposed in the rotation area of both detection levers. It is preferable that the swing lever is rotatably supported on the restriction slider, and the rotational movements of the two detection levers are converted into the forward and backward movement of the swing lever and transmitted to the restriction slider. When such a configuration is adopted, the amount of movement of the swing lever in the front-rear direction is varied by utilizing the opening angle of both detection levers, which changes according to the difference in diameter between the small-diameter disc and the large-diameter disc, and the regulation is accordingly performed. The amount of movement of the slider in the front-rear direction can be changed.

  In this case, an engaging protrusion is provided at a position away from the rotation center of the swing lever, and a stopper portion extending in the width direction is formed at the rear end of the guide hole for guiding the engaging protrusion in the front-rear direction. When the small-diameter disk is inserted in a state of being offset with respect to the center position of the disk insertion slot, the engagement protrusion is brought into contact with the stopper to restrict the rotation angle of the swing lever It is preferable to do. When such a configuration is adopted, when one detection lever is rotated to a predetermined opening angle by a small-diameter disk inserted from the one-sided position, the engaging protrusion of the swing lever that rotates with the detection lever contacts the stopper. Since the further opening angle of the detection lever is restricted in contact, it is possible to reliably prevent the small-diameter disk from being erroneously inserted into the area on the large-diameter disk positioning groove side.

  An embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of an in-vehicle disc player according to the embodiment, FIG. 2 is a perspective view of a guide unit provided in the in-vehicle disc player, and FIG. 4 is an exploded perspective view of the unit, FIG. 4 is a perspective view of a regulating slider provided in the guide unit, FIG. 5 is a plan view of a movable tray provided in the guide unit, and FIGS. 6 to 10 are the guide units when a small-diameter disk is inserted. FIG. 11 is a diagram for explaining the operation of the guide unit when the small-diameter disk is inserted, and FIGS. 12 to 17 are diagrams for explaining the operation of the guide unit when the large-diameter disc is inserted. The in-vehicle disc player shown in FIG. 1 can use both types of large and small discs D having a diameter of 12 cm and a diameter of 8 cm. The code SD is attached to an 8 cm small-diameter disk.

  In FIG. 1, reference numeral 1 denotes a frame that forms a part of the outer shell of the disc player. A box-shaped external housing is constructed by closing the upper open end of the frame 1 with a cover (not shown). It has become so. A horizontally long disc insertion slot 2 is formed on the front surface of the frame 1, and a guide unit 3 is disposed inside the frame 1. The guide unit 3 is equipped with a disk positioning mechanism including a movable tray 4 and a chassis 5. The front end surface of the movable tray 4 faces the disk insertion slot 2.

  The chassis 5 is elastically supported on the inner bottom surface of the frame 1 via an oil damper and a coil spring (not shown), and is locked / unlocked with respect to the frame 1 by a lock mechanism (not shown). ing. An optical pickup 6 and a turntable 7 are mounted on the chassis 5. Further, a clamper (not shown) is disposed immediately above the turntable 7, and this clamper is supported by the cover. As shown in FIGS. 2 and 3, a pair of elongated holes 5 a and 5 b extending in the vertical direction are formed in the left and right side walls of the chassis 5, respectively, and the front center portion of the chassis 5 is formed in the disk insertion slot 2. Protrusively. A substantially T-shaped guide hole 8 is formed in the projecting portion. The guide hole 8 extends in the front-rear direction of the chassis 5 (in the insertion / extraction direction of the disk D) and the rear of the guide 8a. And a pair of stopper portions 8b extending in an arc shape from the end to the left and right sides. In addition, a pair of detection levers (detection members) 9 are rotatably supported on the front side of the chassis 5, and detection pins 9 a are respectively implanted at the tips of the detection levers 9. Both detection levers 9 are biased in the direction in which the detection pins 9a approach each other by the elastic force of a spring (not shown), and the distance between the detection pins 9a is set to be narrower than the diameter of the small-diameter disk SD. When either the large-diameter disk LD or the small-diameter disk SD is inserted from the disk insertion port 2, both detection pins 9a are in contact with the outer peripheral edge of these disks D (LD, SD) and are pushed outward. Along with this, both detection levers 9 rotate. When the detection pin 9a and the detection lever 9 start to rotate in this way, a switch (not shown) is activated to detect the insertion of the disk D.

  Further, a regulating slider (regulating member) 10 urged rearward by a return spring 21 is arranged on the front side of the chassis 5 so as to be able to move forward and backward, and the rear end portions of both detection levers 9 are covered by the regulating slider 10. It has been broken. A connecting hole 10 a is formed in the central portion of the restriction slider 10, and a deformed hole 11 is formed in the standing wall that is bent on the left and right sides of the restriction slider 10. As shown in FIG. 4, the deformed hole 11 is formed by connecting upper portions of the front side first relief portion 11a and the rear side second relief portion 11b having a large depth dimension by a regulation portion 11c having a small depth dimension. It has a shape, and an upper end of the second escape portion 11b is provided with a taper 11d that extends obliquely rearward from the restricting portion 11c.

  A substantially T-shaped swing lever 12 is disposed between the chassis 5 and the regulating slider 10. By engaging the shaft portion 12 a of the swing lever 12 with the connecting hole 10 a, the swing lever 12 is The regulation slider 10 is rotatably supported on the lower surface side. Protrusions 12b are provided at the tips of both arm portions extending in the left-right direction from the shaft portion 12a of the swing lever 12, and these projecting portions 12b are located in a rotation region on the rear end side of both detection levers 9. Yes. Further, an engagement pin (engagement protrusion) 12 c is implanted at the tip of the arm portion extending forward from the shaft portion 12 a of the swing lever 12, and this engagement pin 12 c is inserted into the guide hole 8 of the chassis 5. Has been inserted. The lower portion of the shaft portion 12a is inserted into a long hole 5d formed in the chassis 5, and the long hole 5d and the guide portion 8a of the guide hole 8 are arranged on the same straight line in the front-rear direction. As a result, when both the detection levers 9 are synchronously rotated in the opposite directions by the same angle, the rotational force is converted into the forward movement of the swing lever 12 via the both protrusions 12b, and the engagement pin 12c is connected to the guide hole 8. It advances along the guide part 8a. However, if only one of the detection levers 9 is rotated, the swing lever 12 is rotated only about the shaft portion 12a and does not move forward. In this case, the engagement pin 12c moves within the stopper portion 8b of the guide hole 8. To do. The long hole 5d may be formed continuously at the rear end of the guide hole 8.

  The movable tray 4 is for centering the disk D (LD, SD) at the play position, and is disposed above the regulating slider 10. A driving roller 22 is disposed above the front end surface of the movable tray 4 (see FIG. 1), and the disk D (LD, SD) is sandwiched between the movable tray 4 and the driving roller 22 and conveyed. . The drive roller 22 is rotatably supported on the chassis 5 via a bracket or the like, and can be rotated in both forward and reverse directions using a motor (not shown) as a drive source. The movable tray 4 is a synthetic resin plate-like member, but is largely cut out from the back side to the front side thereof, so that the optical pickup 6, the turntable 7, etc. are not buffered by the movable tray 4. It has become. A pair of bosses 4 a, 4 b are projected on the left and right side surfaces of the movable tray 4, and both bosses 4 a on the front side pass through the deformed holes 11 of the restriction slider 10 to the long holes 5 a on the front side of the chassis 5. The both bosses 4 b on the back side are inserted into the long holes 5 b on the back side of the chassis 5. Further, a spring 13 is stretched between a protruding portion that protrudes from the front end surface of the movable tray 4 toward the front side and an upper end portion of the left side surface of the chassis 5, and the movable tray 4 is moved upward by the elastic force of the spring 13. It is energized. Here, the diameter of the boss 4a is set to be slightly smaller than the depth dimension of the restricting portion 11c of the deformed hole 11. Even when the boss 4a is in the restricting portion 11c, the front side of the movable tray 4 is the boss. It can be moved up and down by a clearance (equivalent to the thickness of the disk D) between 4a and the lower end of the restricting portion 11c.

  Slide plates 14 are disposed outside the left and right side walls of the chassis 5, and the rear end portions of the slide plates 14 are bridged via a connecting portion 14a. A pair of cam holes 14 b and 14 c and a pair of guide holes 14 d are formed in both slide plates 14, and these guide holes 14 d are inserted into guide pins 5 c planted on the left and right side walls of the chassis 5. Thus, the slide plate 14 can move in the front-rear direction of the chassis 5. The bosses 4a and 4b of the movable tray 4 described above are engaged with the cam holes 14b and 14c of the slide plate 14 through the long holes 5a and 5b of the chassis 5, and a motor disposed on the back side of the chassis 5. When the slide plate 14 moves back and forth using 15 (see FIG. 1) as a drive source, the movable tray 4 is moved up and down as a whole. Here, the upper end portion of the front cam hole 14b is an opening sufficiently larger than the diameter of the boss 4a. When the boss 4a is located in the upper end portion of the cam hole 14b, the front side of the movable tray 4 is the boss 4a. And a clearance (dimension difference) between the upper end opening of the cam hole 14b and the lower end of the cam hole 14b. However, the amount of vertical movement of the front side of the movable tray 4 is limited according to the relative position of the boss 4a and the restriction slider 10, and as described above, the boss 4a is the restriction portion of the deformed hole 11. When it is within 11c, the front side of the movable tray 4 can move up and down only by the clearance between the boss 4a and the restricting portion 11c, but the boss 4a is in the first and second relief portions 11a and 11b of the deformed hole 11. The front side of the movable tray 4 can move up and down greatly by the clearance between the boss 4a and the upper end opening of the cam hole 14b.

  Further, a trigger lever 16 is rotatably supported on the lower surface side of the movable tray 4, and this trigger lever 16 is urged clockwise by the elastic force of a return spring (not shown). The trigger lever 16 is provided with a short first boss 16a and a long second boss 16b. The first boss 16a is positioned on the conveyance path of the small-diameter disc SD, and the second boss 16b is a large diameter. It is located on the transport path of the disk LD. As will be described later, when the outer peripheral edge of the disk D (LD, SD) being transported to the play position comes into contact with the first boss 16a or the second boss 16b, the trigger lever 16 counters the elastic force of the spring. The motor 15 is started by the rotation of the trigger lever 16 and the slide plates 14 are moved forward.

  As shown in FIG. 5, a first positioning groove 17 and a second positioning groove 18 having different outer diameters are formed concentrically on the upper surface of the movable tray 4, and the inner first positioning groove 17 is It is formed at a position one step lower than the outer second positioning groove 18. The first boss 16 b of the trigger lever 16 described above is disposed in the first positioning groove 17, but its upper end is set at a position slightly lower than the bottom surface of the second positioning groove 18. The second boss 16 c is disposed in the second positioning groove 18. The first positioning groove 17 has the same maximum groove width (diameter) as the outer diameter of the small-diameter disk SD, and the flat groove bottom surface reaches the front end surface of the movable tray 4. The outer peripheral edge of the first positioning groove 17 is formed in an arc shape centering on the point O (the central axis of the turntable 7) in the figure, and the trigger lever 16 has a A recess 17 a is formed to allow the one boss 16 b to escape to the outside of the first positioning groove 17. The outer second positioning groove 18 has the same maximum groove width (diameter) as the outer diameter of the large-diameter disk LD, and the flat groove bottom surface reaches the front end surface of the movable tray 4. Is also formed in an arc shape centered on the point O. That is, the first and second positioning grooves 17 and 18 are arranged on a concentric circle with the point O as the center, and the small-diameter disc SD is centered at the play position by the first positioning groove 17 on the lower inner side as will be described later. The large-diameter disc LD is centered at the play position by the second positioning groove 18 on the outer side of the upper stage. Further, first inclined surfaces 19 are respectively formed between the outer sides of the first positioning grooves 17 and the second positioning grooves 18, and these first inclined surfaces 19 are formed from the front end surface of the movable tray 2 to the first positioning grooves. Consecutive to 17 maximum diameter portions. Further, second inclined surfaces 20 are respectively formed on both outer sides of the second positioning groove 18, and these second inclined surfaces 20 are continuous from the front end surface of the movable tray 4 to the maximum diameter portion of the second positioning groove 18. Yes. That is, the groove bottom surface of the first positioning groove 17 and the groove bottom surface of the second positioning groove 18 are connected by the pair of first inclined surfaces 19 on the front end surface of the movable tray 4 and are sandwiched between the first inclined surfaces 19. The entrance portion (portion A in FIG. 5) of the first positioning groove 17 is the lowest position.

  In the vehicle-mounted disc player thus schematically configured, the chassis 5 is locked in the frame 1 by the above-described locking mechanism in a standby state where the disc D (LD, SD) is not inserted into the frame 1. It is in a fixed support state. In this state, the bosses 4a and 4b of the movable tray 4 are engaged with the upper ends of the cam holes 14b and 14c of the slide plate 14 at the retracted position, and the movable tray 4 is at the raised position of the long holes 5a and 5b. Is retained. The regulating slider 10 is held in the retracted position by receiving the elastic force of the return spring 21, and the shaft portion 12a of the swing lever 12 connected to the regulating slider 10 is at the rear end position of the long hole 5d. In this case, the boss 4a on the near side of the movable tray 4 is in the first escape portion 11a of the deformed hole 11 of the restriction slider 10, and is pressed against the upper end of the first escape portion 11a by the elastic force of the spring 13. At this time, the upper surface of the inlet portion (portion A in FIG. 5) of the first positioning groove 17 of the movable tray 4 is substantially the same height as the lower surface of the disk D inserted from the disk insertion slot 2 or the lower surface of the disk D. It is located slightly below.

  In the standby state, first, the operation when the small-diameter disk SD is inserted will be described with reference to FIGS.

  When the small-diameter disc SD is inserted into the frame 1 from the disc insertion slot 2, as shown in FIG. 6, after the outer peripheral edge on the tip side in the insertion direction of the small-diameter disc SD abuts both detection pins 9a, As shown in FIG. 7, both detection pins 9a expand outward due to the insertion force of the small-diameter disk SD, and accordingly both detection levers 9 start to rotate synchronously in the opposite directions by the same angle. As a result, both protrusions 12b of the swing lever 12 are pressed from the left and right detection levers 9 with the same force, and the rotational force of both detection levers 9 is converted into forward movement of the swing lever 12 via both protrusions 12b. Therefore, the shaft portion 12 a of the swing lever 12 advances from the rear end of the long hole 5 d, and the engagement pin 12 c also advances along the guide portion 8 a of the guide hole 8. In addition, a switch (not shown) is operated to rotate the drive roller 22 as the detection lever 9 rotates, so that the small-diameter disk SD receives the rotational force of the drive roller 22 and enters the first positioning groove 17 of the movable tray 4. It is conveyed. At that time, the small-diameter disc SD is conveyed from the entrance portion (portion A in FIG. 5) on the front end surface of the movable tray 4 toward the back of the first positioning groove 17. Since the surface 19 is formed, as shown in FIG. 8 to FIG. 9, the small-diameter disc SD is conveyed straight while being guided by both the first inclined surfaces 19, and then in the play position as shown in FIG. 1 is centered in the positioning groove 17. That is, since the outer peripheral edge of the small-diameter disk SD contacts both the first inclined surfaces 19, the component force of the conveying force received from the drive roller 22 acts as a force for guiding the small-diameter disk SD to the center of the inlet portion A, and finally The small-diameter disk SD is centered in the first positioning groove 17.

  When the small-diameter disc SD is conveyed to the play position in this way, as shown in FIG. 8, the opening angle of the two detection levers 9 becomes maximum when the maximum diameter portion of the small-diameter disc SD passes through both detection pins 9a. Accordingly, the advance amount L1 of the swing lever 12 is also maximized. However, since the opening angle of both detection levers 9 is small in the small-diameter disk SD having a diameter of 8 cm, the engagement pin 12c of the swing lever 12 is located in the guide portion 8a. Is moved by a small advance amount L1. When the small-diameter disk SD is further conveyed to the back side, the two detection levers 9 gradually narrow the opening angle accordingly, and as shown in FIG. 9, both detection pins 9a are connected to the rear end of the small-diameter disk SD. The two detection levers 9 and the swing lever 12 return to the same posture as in the standby state when they contact the outer peripheral edge, and the shaft portion 12a and the engagement pin 12c move to the long hole 5d and the rear end of the guide portion 8a, respectively. Thereafter, the swing lever 12 maintains this posture until the play state shown in FIG.

  Further, when the small-diameter disk SD is transported, the regulation slider 10 also moves forward and backward in synchronization with the swing lever 12. In this case, the advance amount L1 of the regulation slider 10 is the same as that of the swing lever 12, and is small. The front boss 4a moves between the first relief portion 11a of the modified hole 11 and the restricting portion 11c. Here, as described above, since the diameter of the boss 4a is set to be slightly smaller than the depth of the restricting portion 11c, the front side of the movable tray 4 has a clearance (between the boss 4a and the restricting portion 11c ( It is regulated so that it can be moved up and down only by the thickness of the disk D). That is, when the outer peripheral edge of the small-diameter disk SD contacts the first inclined surfaces 19 during the conveyance of the small-diameter disk SD, the front side of the movable tray 4 is equivalent to the thickness of the small-diameter disk SD against the elastic force of the spring 13. However, the small-diameter disk SD does not get over the first inclined surfaces 19 and is transported to the second positioning groove 18, and the small-diameter disk SD is lowered. Is conveyed straight to the back side while being guided by both first inclined surfaces 19. Then, when the outer peripheral edge on the rear end side in the insertion direction of the small-diameter disc SD passes through both the first inclined surfaces 19, the front side of the movable tray 4 returns to the raised position by the elastic force of the spring 13, and is shown in FIG. At the play position, the small-diameter disc SD is completely centered in the first positioning groove 17.

  Since the size of the disc insertion slot 2 is set with reference to the outer diameter of the large-diameter disc LD, the small-diameter disc SD is inserted from the disc insertion slot 2 into the center of the inlet portion A of the movable tray 4. Instead, the disc may be inserted from a position offset to the left or right with respect to the center of the disc insertion slot 2. For example, as shown in FIG. 11, when a small-diameter disc SD is inserted from a position offset to the left side of the disc insertion slot 2, only the detection lever 9 on the left side of the drawing rotates greatly and the protrusion on the left side of the swing lever 12 In order to press 12b, the swing lever 12 rotates counterclockwise about the shaft portion 12a. When the detection lever 9 rotates to a predetermined opening angle, the engagement pin 12c of the swing lever 12 moves to the guide hole 8. In contact with the end of the stopper 8b on the right side of the figure. Accordingly, since further rotation of the detection lever 9 is restricted at this time, the small-diameter disk SD is guided to the center of the movable tray 4 with the detection pin 9a of the left detection lever 9 as a fulcrum, and the small-diameter disk SD is erroneously detected. Thus, it is not guided to the second positioning groove 18 on the left side of the figure. When the small-diameter disc SD is inserted from a position shifted to the right side of the disc insertion slot 2, basically the only difference is that the detection lever 9 on the right side of the drawing rotates and the swing lever 12 rotates clockwise. An operation similar to the above is performed.

  When the small-diameter disk SD is centered in the first positioning groove 17 as described above, the outer peripheral edge of the small-diameter disk SD pushes the first boss 16a into the recess 17a as shown in FIG. Rotates counterclockwise and the motor 15 starts. As a result, the slide plate 14 moves forward from the retracted position, and the bosses 4a and 4b are moved downward of the long holes 5a and 5b while engaging the cam holes 14b and 14c. The small-diameter disc SD is separated from the drive roller 22 while being held in a horizontal posture. At this time, since the regulating slider 10 is held in the retracted position by receiving the elastic force of the return spring 21, the front boss 4 a moves downward in the first escape portion 11 a of the deformed hole 11 when the movable tray 4 is lowered. Moving. A clamper (not shown) descends as the movable tray 4 descends, so that the small-diameter disk SD separated from the drive roller 22 is chucked between the clamper and the turntable 7, and the lock mechanism The chassis 5 is unlocked by the above, and the chassis 5 is elastically supported with respect to the frame 1. In this state, the turntable 7 rotates and drives the small-diameter disk SD, and the optical pickup 6 is transported in the radial direction of the small-diameter disk SD to perform a reproducing operation.

  Next, the operation when the large-diameter disk LD is inserted will be described with reference to FIGS.

  When the large-diameter disc LD is inserted into the frame 1 from the disc insertion slot 2, the outer peripheral edge on the front end side in the insertion direction of the large-diameter disc LD abuts against both detection pins 9a as shown in FIG. Thereafter, as shown in FIG. 13, both detection pins 9a expand outward due to the insertion force of the large-diameter disk LD, and accordingly both detection levers 9 start to rotate synchronously in the opposite directions by the same angle. As a result, both protrusions 12b of the swing lever 12 are pressed from the left and right detection levers 9 with the same force, and the rotational force of both detection levers 9 is converted into forward movement of the swing lever 12 via both protrusions 12b. Therefore, the shaft portion 12 a of the swing lever 12 advances from the rear end of the long hole 5 d, and the engagement pin 12 c also advances along the guide portion 8 a of the guide hole 8. Further, since the switch (not shown) is operated by the rotation of the detection lever 9 to rotationally drive the driving roller 22, the large-diameter disk LD receives the rotational force of the driving roller 22 and receives the second positioning groove 18 of the movable tray 4. It is conveyed to. At that time, as shown in FIGS. 14 to 15, the large-diameter disc LD is guided from the entrance portion A of the front end surface of the movable tray 4 over the first inclined surfaces 19 to the second positioning groove 18, and is shown in FIG. As shown in FIG. 16, after being straightly conveyed while being guided by both second inclined surfaces 20, it is centered in the second positioning groove 18 at the play position as shown in FIG.

  When the large-diameter disc LD is thus transported to the play position, as shown in FIG. 15, the advance amount L2 of the swing lever 12 becomes maximum when both the detection levers 9 are rotated to a predetermined opening angle. However, since the opening angle of both detection levers 9 in this case is sufficiently larger than when both detection pins 9a are in contact with the maximum diameter portion of the small-diameter disc SD, the engagement pin 12c of the swing lever 12 is a guide portion. It moves with a large advance amount L2 to the front end position of 8a. Then, when the large-diameter disc LD is further conveyed to the back side, as shown in FIGS. 15 to 16, both the detection levers 9 gradually reduce the opening angle after rotating to the maximum opening angle. As shown, when the large-diameter disc LD is conveyed to the play position, both the detection lever 9 and the swing lever 12 return to the same posture as in the standby state, and the shaft portion 12a and the engagement pin 12c are respectively provided with the long hole 5d and the guide. It moves to the rear end of the part 8a.

  Further, the regulation slider 10 also moves forward and backward in synchronization with the swing lever 12 when the large-diameter disk LD is transported. In this case, the advance amount L2 of the swing lever 12 and the regulation slider 10 is larger than that when the small-diameter disk SD is transported. Therefore, the boss 4a on the near side of the movable tray 4 moves from the first escape portion 11a of the modified hole 11 to the second escape portion 11b through the restricting portion 11c. In this case, since the boss 4a moves along the taper 11d toward the diagonally rear of the upper end of the second escape portion 11b, the front side of the movable tray 4 is lowered by an amount corresponding to the height of the taper 11d when the regulating slider 10 moves forward. After that, the boss 4a moves to the second escape portion 11b, so that the near side of the movable tray 4 can be moved up and down largely by the clearance between the boss 4a and the upper end opening of the cam hole 14b of the slide plate 14.

  That is, when the large-diameter disk LD jumping into the entrance portion A of the movable tray 4 is guided to the upper outer region over both the first inclined surfaces 19 during the conveyance of the large-diameter disk LD, first, the front side of the movable tray 4 is While being slightly pushed down by the contact between the outer peripheral edge of the large-diameter disk LD and the first inclined surfaces 19, this operation is complemented by the contact between the boss 4a and the taper 11d described above. Thereafter, when the large-diameter disc LD gets over both the outermost second inclined surfaces 20, the front side of the movable tray 4 is further pushed down by the contact between the outer peripheral edge of the large-diameter disc LD and both the second inclined surfaces 20. At this time, since the boss 4a passes through the restricting portion 11c of the deformed hole 11 and moves to the second escape portion 11b, the front side of the movable tray 4 can be lowered sufficiently large. In this way, the large-diameter disc LD is conveyed straight to the back side while being guided by both the second inclined surfaces 20, and the outer peripheral edge on the rear end side in the insertion direction of the large-diameter disc LD passes through both the second inclined surfaces 20. Then, the front side of the movable tray 4 returns to the rise by the elastic force of the spring 13, so that the large-diameter disc LD completely enters the second positioning groove 18 and is centered at the play position shown in FIG.

  When the large-diameter disk LD is centered in the second positioning groove 18 as described above, the outer peripheral edge of the large-diameter disk LD pushes the second boss 16b outward as shown in FIG. Rotates counterclockwise and the motor 15 starts. As a result, the slide plate 14 advances from the retracted position, and the bosses 4a and 4b engage with the cam holes 14b and 14c as the slide plate 14 advances as in the insertion of the small-diameter disc SD. 5b, the movable tray 4 is lowered in a horizontal posture while holding the large-diameter disk LD, and the large-diameter disk LD is separated from the driving roller 22. Further, since the regulating slider 10 is held in the retracted position by receiving the elastic force of the return spring 21 at the play position, the front boss 4a moves in the first escape portion 11a of the deformed hole 11 when the movable tray 4 is lowered. Move down. As the movable tray 4 descends, a clamper (not shown) descends, so that the large-diameter disk LD separated from the drive roller 22 is chucked between the clamper and the turntable 7, and in this state the turntable The large-diameter disk LD is driven to rotate by 7 and the optical pickup 6 is transported in the radial direction of the large-diameter disk LD to perform a reproducing operation.

  In the in-vehicle disc player configured as described above, the movable tray 4 elastically biased upward by the spring 13 is disposed at a position facing the disc insertion slot 2 so as to be movable up and down, and a small diameter is provided on the upper surface of the movable tray 4. A first positioning groove 17 for positioning the disk SD and a second positioning groove 18 for positioning the large-diameter disk LD are formed in steps, and both the first positioning groove 17 and the second positioning groove 18 are outside. A pair of first inclined surfaces 19 and a pair of second inclined surfaces 20 are formed respectively, and both the first inclined surfaces 19 are continued from the front end surface of the movable tray 4 to the outer peripheral edge of the first positioning groove 17. Since the two inclined surfaces 20 are continuous from the front end surface of the movable tray 4 to the outer peripheral edge of the second positioning groove 18, two types of large and small are used by using the first and second inclined surfaces 19 and 20 as guide surfaces. Disk D (LD, SD) can be guided smoothly to the first and second positioning grooves 17 and 18 correspond to. At that time, the movable tray 4 is slightly pushed down by the contact between the outer peripheral edge of the disk D and the inclined surfaces 19, 20, and when the disk D passes through the inclined surfaces 19, 20, the movable tray 4 moves upward by the elastic biasing force of the spring 13. In order to return, the disk D gets over the inclined surfaces 19 and 20 into the corresponding positioning grooves 17 and 18 and is centered at the play position. That is, the small-diameter disk SD is centered in a state where the horizontal movement is restricted by the outer peripheral wall of the first positioning groove 17, and the large-diameter disk LD is restricted in the horizontal movement by the outer peripheral wall of the second positioning groove 18. It will be centered in the state. Therefore, even if a large external vibration is applied at the time of chucking after such centering, the disk D (LD, SD) does not inadvertently jump forward from the first and second positioning grooves 17, 18, and there are two types, large and small. The centering deviation of the disk D can be reliably prevented.

It is a principal part perspective view of the vehicle-mounted disc player which concerns on an Example. It is a perspective view of the guide unit with which this in-vehicle disc player is equipped. It is a disassembled perspective view of this guide unit. It is a perspective view of the control slider with which this guide unit is equipped. It is a top view of the movable tray with which this guide unit is equipped. It is an operation explanatory view of the guide unit when a small-diameter disk is inserted. It is an operation explanatory view of the guide unit when a small-diameter disk is inserted. It is an operation explanatory view of the guide unit when a small-diameter disk is inserted. It is an operation explanatory view of the guide unit when a small-diameter disk is inserted. It is an operation explanatory view of the guide unit when a small-diameter disk is inserted. It is operation | movement explanatory drawing of this guide unit at the time of the one-sided insertion of a small diameter disc. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted. FIG. 6 is an operation explanatory view of the guide unit when a large-diameter disk is inserted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Disc insertion port 3 Guide unit 4 Movable tray 4a, 4b Boss 5 Chassis 5a, 5b Long hole 6 Turntable 8 Guide hole 8a Guide part 8b Stopper part 9 Detection lever (detection member)
9a Detection pin 10 Restriction slider (regulation member)
10a connecting hole 11 deformed hole 11a first relief portion 11b second relief portion 11c regulating portion 11d taper 12 swing lever 12a shaft portion 12b projection portion 12c engagement pin (engagement projection portion)
13 Spring 14 Slide plate 14b, 14c Cam hole 16 Trigger lever 16a First boss 16b Second boss 17 First positioning groove (positioning groove for small diameter disk)
18 Second positioning groove (positioning groove for large diameter disc)
19 First inclined surface 20 Second inclined surface 21 Return spring 22 Drive roller D disk LD Large diameter disk SD Small diameter disk

Claims (5)

In a disk positioning mechanism for centering a small-diameter disk or a large-diameter disk inserted from a disk insertion port to a play position,
A movable tray elastically biased upward is disposed at a position facing the disk insertion opening so as to be movable up and down, and a positioning groove for a small-diameter disk and a positioning for a large-diameter disk having different outer diameters are provided on the upper surface of the movable tray. And a pair of first inclined surfaces and a pair of second inclined surfaces on both outer sides of the small-diameter disk positioning groove and the large-diameter disk positioning groove, respectively. An inclined surface is continued from the front end surface of the movable tray to the outer peripheral edge of the small-diameter disk positioning groove, and both the second inclined surfaces are continued from the front end surface of the movable tray to the outer peripheral edge of the large-diameter disk positioning groove. A disk positioning mechanism characterized by that.   2. The disc detection member according to claim 1, wherein a pair of disc detection members that can move in contact with the outer peripheral edge of the disc are disposed between the disc insertion opening and the front end surface of the movable tray, and the amount of movement of the disc detection members. A disc positioning mechanism characterized in that a restricting member having a different amount of displacement is provided in accordance with the amount of displacement, and the amount of downward movement of the movable tray is restricted in accordance with the amount of displacement of the restricting member.   3. The restriction slider according to claim 2, wherein the restriction member is a restriction slider that can move in the front-rear direction, and the restriction slider has a different amount of movement in the front-rear direction according to the amount of movement of the disk detection member. A disk positioning mechanism.   4. The disk detection member according to claim 3, wherein the disk detection member is a pair of rotatable detection levers, and a swing lever is disposed in a rotation area of both the detection levers, and the swing lever can be rotated to the restriction slider. The disc positioning mechanism is characterized in that the rotational movement of both detection levers is converted into the forward / backward movement of the swing lever and transmitted to the regulating slider.   5. The stopper portion according to claim 4, wherein an engaging protrusion is provided at a position away from the rotation center of the swing lever, and the stopper extends in the width direction at the rear end of the guide hole for guiding the engaging protrusion in the front-rear direction. When the small-diameter disk is inserted with a deviation from the center position of the disk insertion slot, the rotation angle of the swing lever is regulated by bringing the engaging protrusion into contact with the stopper portion. A disk positioning mechanism characterized by the above.

Images