JPH0741746U - Disk device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a low-cost disk device capable of positioning a disk cassette with a simple configuration. A positioning member 84a engaged with a positioning hole provided in a disc cassette is formed by cutting and raising the base 10, and the disc cassette is positioned at one position by the positioning member 84a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc device that records and reproduces information on a disc.

[0002]

[Prior art]

 The disk device is a device that records or reproduces information on or from a disk-shaped recording medium such as a magnetic disk or a laser disk. Recording or reproduction is performed by rotating the disk and moving the head in contact with or close to the disk. In this case, the head is usually mounted on a carriage and moved (seek) by a motor along the radial direction of the disk.

In the above-mentioned disc device, an insertion / ejection means for mounting and ejecting a disc cassette, a disc rotation drive means for rotating a disc by a motor, and a head along a radial direction of the disc are mounted on a base supporting each component. There are provided head seek means for moving the head to an arbitrary track position, head load means for loading and unloading the head with respect to the disk, and the like. Further, a control circuit for controlling the entire disc device, a connector for connecting a power source, etc. are provided, and this control circuit is connected to a host device etc. through an interface.

Further, such a disk device is used as an external storage device of an electronic device such as a personal computer or a word processor, and is often incorporated in the main body of the electronic device. With the recent price reduction of electronic devices, cost reduction is strongly demanded even in the above disk device.

In such a disc device, specifically, a disc device using a 3.5-inch type disc cassette, when the disc cassette is positioned on the base, the disc cassette is provided integrally with or separately from the base. The disk cassette is positioned with respect to the base by engaging the two positioning pins with the two positioning holes of the disk cassette.

[0006]

[Problems to be solved by the device]

 However, in such a disc device, when the positioning pin is provided, the base must be manufactured by die casting or the like to be integrated, and if it is a separate member, parts cost and assembly cost will be required. Will be disadvantageous in terms of cost.

The present invention has been made in view of the above technical problems, and an object of the present invention is to provide a disk device which can position a disk cassette with a simple structure and is low in cost. That is.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems and achieve the above-mentioned object, the present invention relates to a disk device for positioning by positioning a positioning member provided on a base into a positioning hole provided in the disk cassette. The member is formed by cutting and raising the base, and the disc cassette is positioned at one position by the positioning member.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In each of the following drawings, the same reference numerals denote the same parts or corresponding parts. 1 to 5 are views showing an embodiment of a disk device to which the present invention is applied, FIG. 1 is a plan view showing an internal configuration at the time of unloading, with a cover omitted, and FIG. 2 at the time of loading of FIG. 2 is a plan view showing the internal structure of FIG. 3, FIG. 3 is a front view seen from the line 3-3 in FIG. 2, and FIG. 4 is a rear view seen from the line 4-4 in FIG. FIG. 5 is a vertical sectional view taken along the line 5-5 in FIG.

As shown in FIGS. 1 and 2, each component is housed in a box-shaped base 10 having an open top. The base 10 is formed of a thin metal structure such as aluminum, and its upper surface is a cover (not shown) formed of a non-magnetic thin plate material such as aluminum for magnetic shielding and dust prevention. Is covered. As shown in FIG. 3, a front panel 13 having a cassette insertion opening 13a for inserting and ejecting the disc cassette 11 is attached to the front surface of the base 10. Further, as shown in FIGS. 5 and 6, a shutter 12 is formed at the front end of the base 10 so as to prevent dust and the like from entering through the cassette insertion opening 13a. The base 12b is rotatably attached to the base 10 so that the base 12b is rotatably supported. The shutter 12 is constantly urged in the clockwise (clockwise) direction by a shutter spring 93 attached to the rotary shaft 12a of the shutter 12, and in the counterclockwise (counterclockwise) direction when the disc cassette 11 is inserted. It rotates to allow the insertion of the disc cassette 11.

FIG. 6 is a detailed view around the shutter 12 in which the front panel 13 is omitted in FIG. In order to prevent the rotary shafts 12a and 12b from being deformed or destroyed when the disk cassette 11 is strongly pressed near the rotary shafts 12a and 12b when the disc cassette 11 is inserted, as shown in FIG. A stopper 36a is provided by cutting and raising a part of the cover 36, and even if the rotating shaft 12a is deformed, it abuts on the stopper 36a and does not permanently deform. Although the stopper 36a is provided only near the rotary shaft 12a in this embodiment, it may be provided near both rotary shafts 12a and 12b.

Further, a push button (eject button) 14 that is operated when ejecting the loaded disk cassette 11 is provided at the left end of the front panel 13.

In FIGS. 1 and 2, a cassette guide 15 for guiding the insertion, ejection, loading and unloading of the disc cassette 11 is held in the base 10 so as to be movable up and down and back and forth. . The cassette guide 15 has a cross-sectional shape that guides and holds the disc cassette 11 that is inserted from the front side. Further, in the example shown in the figure, the rear portion (back portion) is cut away so that the left half of the cassette guide 15 is notched. It has a planar shape provided. Further, as shown in FIG. 7, the cassette guide 15 is provided with at least one projection 15a at the innermost portion in the insertion direction on the guide rail 15c of the cassette guide 15 on the side where the space is formed. The protrusion 15a is set such that the play between the upper face of the disc cassette and the lower face of the cassette guide 15 at the protrusion 15a portion is about 0.2 mm when the disc cassette 11 is inserted. Further, as shown in FIG. 8, at least one protrusion 15d is provided at the innermost portion in the insertion direction on the side surface of the guide rail 15b on the right side of the cassette guide 15. The projection amount of the projection 15d is set to about 0.2 mm, and the play between the inner width of the cassette guide 15 and the width of the disc cassette 11 is set to about 0.2 mm. The protrusions 15a and 15d are processed at the same time when the cassette guide 15 is pressed. Further, the cassette guide 15 is mounted on the right side of the base 10 (rightward shift position), and on the left side of the base 10, there is a space for disposing other components. Has been formed.

1 and 2, a head having a head 17 for recording or reproducing information on a disk (information medium) in the disk cassette 11 is provided in a region of the notch 16 of the cassette guide 15. A seek mechanism 18 is provided. The head seek mechanism 18 is a mechanism for moving (seeking) the head 17 to an arbitrary track position along the radial direction of the disk. The head seek mechanism 18 moves in a direction perpendicular to the seek direction. Since the components constituting the head seek mechanism are provided, the head seek mechanism 18 is small in amount protruding from the outer shape of the disk cassette 11 to the outside at the time of seek, and the miniaturization of the device is achieved.

A disk 11a (magnetic disk or the like) as an information medium (medium) housed inside the disk cassette 11 receives a head by opening a slideable shutter 19 provided in the disk cassette. It can be accessed externally, such as by loading the head 17 through the opening.

In FIG. 1 and FIG. 2, a vertical shaft 20 a integrally provided by projecting in a cylindrical shape from the cassette guide 15 at the center of the left side of the cassette guide 15 is provided above the cassette guide 15. A shutter lever 21 that can swing in the center is pivotally supported. Further, a vertical shaft 20b integrally provided by projecting in a cylindrical shape from the cassette guide 15 at the right rear portion of the cassette guide 15 has a latch lever 22 which is swingable about the shaft above the cassette guide 15. Is pivotally supported. The shutter lever 21 is for opening and closing the shutter 19 of the head receiving opening of the disc cassette 11 in synchronism with the insertion of the disc cassette 11. A pin 23 is provided that abuts on the tip portion and is abuttable on the end edge of the shutter 19. Further, the shutter lever 21 is biased in the clockwise (clockwise) direction in the figure by a spring 25 stretched between the shutter lever 21 and the cassette guide 15. Further, on the upper surface of the cassette guide 15, a groove 26 having a predetermined length is formed so that the pin 23 can be moved along the movement trajectory of the pin 23.

1 and 2, the latch lever 22 is urged by a latch spring 27 in the counterclockwise (counterclockwise) direction in the figure, and in the unload state, as shown in FIG. The engaging portion 29 provided at one end of the latch lever 22 is latched with the stopper 28a formed on the base 10 so that the latch lever 22 is in a latched state. Further, as shown in FIG. 14, the engaging portion 29 is formed with a concave portion 29a capable of engaging with the corner portion 28c of the stopper 28. The position of the 28c corresponds to the position where the cassette guide 15 is completely raised. Further, a movement restricting portion 29b larger than the outer shape of the engaging portion 29 is provided on the top of the engaging portion 29. The other end of the latch lever 22 is provided with a pin 30 with which the tip of the inserted disc cassette 11 can come into contact. Thus, the side opposite to the cutout portion 16 of the cassette guide 15, that is, the side on which the head seek mechanism 18 and the cassette loading mechanism 33 described later are arranged (by moving the cassette guide 15 and the disc cassette 11 closer to each other). The latch mechanism 22 is disposed on the side opposite to the side where the space is formed).

9A and 9B are views showing the mounting parts on the bottom surface of the base 10 with the cassette loading mechanism, the head seek mechanism, etc. removed, FIG. 9A being a plan view, FIG. 9B being FIG. 9A. The front view seen from the line BB in the inside, (C) the side view seen from the line C-C in (A), (D) the longitudinal section seen from the line D-D in (A) It is a figure. In FIG. 9, a disk-shaped flat motor 31 for driving a disk is attached to a substantially central portion of the bottom surface of the base 10, and the motor 31 has a central hole (not shown) of the disk cassette 11. ), A drive shaft 82 engaged with a drive hole (not shown) provided in the vicinity of the center hole of the disk cassette 11, and a magnet 83 for attracting and holding the disk hub. Has been. A positioning convex portion 84a, which is a cut-up portion of the base 10, for positioning the disc cassette 11 in the loading state is formed on the left rear side of the motor 31 and the base 10 is arranged on the right rear side. A positioning surface 84b is formed by cutting and raising a part of the above. As shown in (D), the positioning convex portion 84a is composed of a convex portion 84c that fits into a positioning hole (not shown) of the disc cassette 11 and a positioning surface 84d of the disc cassette 11. Further, a positioning surface 85 obtained by cutting and raising a part of the base 10 is provided near the cassette insertion opening 13a (FIG. 3). A circuit board 32 for controlling the disk device is joined around the motor 31.

As shown in FIG. 9A, the circuit board 32 is sandwiched between one or a plurality of protrusions 10 a that are cut and raised in a part of the base 10 and the upper surface of the base 10. Assembling is simplified by fixing with one fixing screw 99. Further, as shown in FIG. 4, the circuit board 32 does not float up from the base 10 by inserting / removing the interface cable 32a for connecting to the external electronic device arranged on the circuit board 32. As described above, it is sandwiched between the rear wall convex portion 10b integrated with the base 10 and the upper surface.

In FIGS. 1 and 2, a cassette loading mechanism 33 for moving the cassette guide 15 to a loading position and an unloading position is arranged in a space formed on the left side of the cassette guide 15 in the base 10. It is set up. Further, the base 10 is provided with an operating lever 34 that extends across the upper side of the cassette guide 15 and that is pivotally supported by the base 10 at both ends so as to be swingable. The button lever 36 of the loading mechanism 33 is constantly urged by the return spring 35 toward the insertion opening 13a, and by pushing the eject button 14, the button lever 36 can move backward against the return spring 35. The operating lever 34 has its swinging position regulated by the button lever 36, and drives the cassette guide 15 to the load position and the unloading position by the swinging position.

A spring 87 is hung between the operating lever 34 and the cassette guide 15, and the cassette guide 15 is constantly biased in the ejecting direction.

10 to 13 are partial side views showing the unloading and loading states of the cassette loading mechanism 33. FIG. 10 is a state of the button lever 36 at unloading, and FIG. 11 is unloading. The state of the operating lever 34 and the cassette guide 15 of FIG. 12, the state of the button lever 36 at the time of loading in FIG. 12, and the state of the operating lever 34 and the cassette guide 15 at the time of loading FIG. The button lever 36 is slidably supported with respect to the base 10 by a sliding guide portion composed of an engaging portion 10d formed by cutting and raising a part of the base 10 and an elongated hole 36a, and is returned. It is constantly urged to the left (forward) in the figure by the vane 35. The operating lever 34 is pivotally supported at both ends thereof so as to be swingable around a fulcrum 37 provided on the base 10. Therefore, the notch 38 formed in the button lever 36 and the convex portion 39 provided on one side of the operating lever 34 are engaged with each other.

Further, cam grooves 40 are formed on both sides of the operating lever 34, and step-like holding portions 41 are provided on both sides of the base 10. On the other hand, on both sides of the cassette guide 15, a center pin 42 slidably engaged with the cam groove 40 of the operating lever 34 and a roller portion 43 abutting on the holding portion 41 of the base 10 are provided. Since the cassette guide 15 has a left half cutout shape as shown in FIGS. 1 and 2, the holding portion 41 and the roller portion 43 have a total of one location on the left side and two locations on the right and front sides. It is provided in three places. Further, mountain-shaped protrusions 41d 1 are provided at the rear end of the device (on the side of the lower vertical portion 41c) of the two horizontal portions 41b on the left side and the front right side of the holding portion 41. The protrusion 41d is connected to the horizontal portion 41b and the lower vertical portion 41c with a smooth R, and the height of the apex of the protrusion 41d is set to 0.1 mm to 0.2 mm.

Next, with reference to FIGS. 1 to 13, the operation of each part when loading and unloading the disc cassette 11 will be described. When the disc cassette 11 is inserted from the cassette insertion port 12 (Fig. 3), the disc cassette 11 moves on the rail portion of the cassette guide 15 and, as shown in Fig. 8, on the rail portion 15c on the left side in Fig. 1. In order to ride on the protrusion 15a, the left side of the disc cassette 11 is slightly moved. When the disk guide 11 is further inserted, the left side rail portion 15c of the cassette guide 15 is interrupted, so that the left side of the insertion tip end portion of the disc cassette 11 tends to go down. Therefore, the force of the disc cassette 11 trying to move upward acts near the cassette guide insertion port, but is blocked by the lower surface of the cassette guide 15. Since the rail portion on the right side in FIG. 1 has a sufficient guide length, as a result, the disc cassette 11 is inserted while keeping the parallel state, and the tip of the disc cassette 11 comes into contact with the lower head 17b and damages the head. Never give. Next, the tip of the disc cassette 11 contacts the pin 23 of the shutter lever 21 (FIGS. 1 and 2), and the shutter lever 21 moves counterclockwise (counterclockwise) in FIG. 1 against the spring 25. Rotate. At this time, the pin 23 (FIGS. 1 and 2) of the shutter lever 21 comes into contact with the edge of the shutter 19 of the disc cassette 11, and the shutter 19 is returned by the rotation of the shutter lever 21 (insertion of the disc cassette 11). By moving it against (not shown), the head receiving port is opened, and the head 17 can access the disk 11a (medium).

Next, the tip of the disc cassette 11 contacts the pin 30 of the latch lever 22 (FIGS. 1 and 2) and further pushes the disc cassette 11 (in the inserting direction), so that the latch lever 22 moves to the latch spring 27. On the contrary, it rotates in the clockwise (clockwise) direction in the figure, and the engaging portion 29 of the latch lever 22 is disengaged from the stopper 28 of the base 10. By releasing the latch, the cassette guide 15 held by the engaging portion 29 can be moved rearward (to the right in FIG. 10) of the apparatus. The position of the disk cassette 11 in the forward direction within the cassette guide 15 is regulated by the pin 23, which is in contact with the tip thereof, in contact with the rear end of the groove 26 (FIG. 2).

When the disc cassette 11 is pushed further, the cassette guide 15 also moves to the rear side of the apparatus. Therefore, the center pin 42 (FIGS. 11 and 13) of the cassette guide 15 horizontally moves in the cam groove 40 of the operating lever 34 in the right direction (rear side of the device) in the drawing, and the urging force of the return spring 35 is the same as the above. The actuating lever 34 is rotated by acting on the convex portion 39 of the actuating lever 34 via the button lever 36, and the actuating lever 34 is rotated clockwise from the position of FIG. 11 about the fulcrum 37. Rotate in the direction. At the same time, the roller portions 43 (three places) of the cassette guide 15 also move to the rear side of the apparatus along the horizontal portion 41b of the holding portion 41. Since the pin 39 moves to the left side in the figure by the rotation of the operating lever 34, the button lever 36 also moves in conjunction with it.

Further, when the disc cassette 11 is pushed, the roller portion 43 of the cassette guide 15 against the biasing force of the spring 87 passes over the protrusions 41d at the two left and right front sides of the stair-like holding portion 41, and is pushed down. It descends so as to move along the side vertical portion 41c, and the cassette guide 15 enters the cassette loading state (the state where the disc cassette 11 is at the loading position) shown in FIG. At this time, as shown in FIG. 14B, the stopper 28 on the base 10 and the movement restricting portion 29b of the engaging portion 29 of the latch lever 22 are in contact with each other, and the engaging portion 29 moves downward. Movement is restricted. Therefore, there is no possibility that the engaging portion 29 gets under the stopper 28. Further, since the movement restricting portion 29b has a shape larger than the outer shape of the engaging portion 29, the engaging portion 29 is prevented from slipping under the stopper 28 regardless of the contact position between the engaging portion 29 and the stopper 28. Block.

In the loading state in which the cassette guide 15 is lowered downward, the cassette guide 15 is brought into contact with the lower holding surface (vertical surface) 41 c of the holding portion 41 of the base 10 and the cassette guide 15. The front and rear positions of 15 are restricted. Further, in this loading state, the disc cassette 11 is positioned in the mounted state by the positioning convex portion 84a and the positioning surfaces 84b and 85, and the cassette guide 15 is pushed downward by the actuating lever 34. Is urged downward by. For this reason, the load position of the cassette guide 15 is set by pressing the upper surface of the disk cassette 11 and positioning it by the plurality of disk cassette pressing projections 86 (FIGS. 1 and 2) provided on the cassette guide 15. Regulated. At this time, in the disc cassette 11 in the cassette guide 15, as shown in FIG. 15, only one position of the positioning convex portion 84a provided on the base 10 is fitted into the positioning hole 11b provided on the disc cassette 11. Is positioned relative to the base 10 and is in contact with the semi-cylindrical projection 30 of the latch lever 22 arranged on the cassette guide 15, so that the latch lever 22 is stretched. The biasing force of the spring 27 applies a force to rotate clockwise (clockwise) in the cassette guide 11 to try to incline within the looseness range of the cassette guide 15 and the disc cassette 11, but the rail 15b of the cassette guide 15 is not supported. The inclination is limited by the protrusion 15d provided on the side surface of the. As described above, the loading position of the disc cassette 11 in the cassette guide 15 is regulated. When the cassette guide 15 is in the load position, the disc (specifically, the hub portion) in the disc cassette 11 is magnetically attracted to the rotor of the disc driving motor 31 (FIG. 9) and the rotor By engaging with the center shaft 81 and the drive pin 82, the positioning of the disc (media) (height direction, rotation direction) is performed. That is, it is set to a loading state in which information can be recorded and reproduced on the disc.

Next, the ejection of the disc cassette 11 will be described. When ejecting the disc cassette 11 set in the disc device, the eject button 14 (FIGS. 3 and 12) is pressed to move the button lever 36 rearward against the return spring 35. When the button lever 36 moves rearward, first, the engagement of the notch 38 of the button lever with the convex portion 39 of the operating lever 34 causes the operating lever 34 to move counterclockwise from the position of FIG. Rotate in the (counterclockwise) direction. Next, the center pin 42 is lifted by the cam groove 40, and the cassette guide 15 moves upward. Further, when the eject button 14 is pushed, the lower portion 43 (vertical portion) 41c disengages from the lower portion 43 due to the ascent of the cassette guide 15 and gets over the protrusion 41d. It starts moving to the left) by the urging force of the spring 87.

When the operator stops pressing the eject button 14 or weakens the pressing force during the discharging operation, when the center of the roller portion 43 does not pass the apex of the protrusion 41d. The roller portion 43 cannot ride over the protrusion portion 41d, and is returned to the loading state again by the downward biasing force of the operating lever 34. Further, when the center of the roller portion 43 is at the apex of the protrusion 41d, the roller portion 43 moves over the protrusion 41d and moves forward due to the biasing force of the spring 87. The movement of time is surely performed.

When the cassette guide 15 moves, the engaging portion 29 of the latch lever 22 also moves along the side surface portion 28b of the stopper 28.

Further, when the eject button 14 is pressed, the shutter lever 21 and the latch lever 22 are rotated clockwise (counterclockwise) and counterclockwise (counterclockwise) by the biasing forces of the return springs 25 and 27 (FIGS. 1 and 2). ), The disk cassette 11 is ejected forward and the cassette guide 15 is moved forward.

FIG. 16 is a vertical cross-sectional view of the head seek mechanism 18 portion taken along the line 10-10 in FIG. On the notch 16 side of the cassette guide 15, there is a bar 61 for head lift (unloading the head) that extends through the underside of the head arm 57. A holder 90 is attached to one end of this bar 61. The end is fixed and attached to the cassette guide 15. Then, as shown in FIG. 17B, the bar 61 is configured so that the bottom portion 90b of the holder 90 engages with the base 10 when the head is unloaded. An elastic portion 90a is formed on the side surface of the holder 90 so that the holder 90 can easily engage with the base 10 when the head is unloaded. Further, the bottom portion 90b may be engaged with a member other than the base 10 during unloading.

With the above configuration, at the time of unloading when the cassette guide 15 moves upward, the head arm 57 is lifted to the raised position as shown in FIG. 16, and the upper head 17A is held at the unload position. At this time, the bar 61 is configured to support the head arm 57 substantially at the center between the fixing point and the holding point of the head 17A.

Further, as shown in FIG. 16, a screw 95 made of a material having a small sliding resistance is provided at the approximate center of the portion of the head arm 57 that contacts the bar 61. This screw 95 is provided so as to project from the surface of the head arm 57 facing the bar 61, so that the head arm 57 and the bar 61 do not come into direct contact with each other. That is, in the unload state, the head arm 57 is held by the bar 61 via the screw 95. A groove 95a for engaging a tool such as a driver is provided on the surface of the screw 95 opposite to the surface contacting the bar 61, and a tool such as a driver is engaged with the groove 95a. By rotating the screw 95, the head arm 57 can be moved up and down in the unload state. That is, the position of the upper head 17A in the unloading state can be adjusted.

Further, the movement of the holder 90 when the head shifts to the unloading state will be described in detail. As described above, the cassette guide 15 moves upward, and the bar 61 also moves upward in FIG. 17A. , And moves to the base 10 side. Immediately before shifting to the state of FIG. 17B, the holder 90 comes into contact with the side wall of the base 10 and hinders the movement of the holder 90. However, the moving force of the bar 61 causes the elastic portion of the holder 90 to move. The smooth movement can be achieved by forming the curved inclined surface of 90a.

In the ejection operation as described above, if the operator's finger is hooked on the insertion opening 12 and the eject button and the button 14 are pressed, the cassette guide 15 is fully raised as shown in FIG. That is, the protruding length of the eject button 14 with respect to the protruding amount of the disc cassette 11 from the insertion opening 12 in a state where the engaging portion 29 of the latch lever 22 is engaged with the front surface portion 28a of the stopper 28. Is long enough not to touch the end face of the disk cassette 11.

Even if the operator's finger hits the end face of the disc cassette 11 and the ejection of the disc cassette 11 is stopped as shown in FIG. 19, the urging force of the spring 27 causes the engagement portion 29 to move. The corner portion 28c of the stopper 28 is engaged with the recess 29a.

Further, when the shutter lever 21 moves back in the groove 26 and returns, the pin 23 of the shutter lever 21 comes into contact with the front end of the groove 26, and the returning force is applied to the cassette guide 15. Thus, first, the cassette guide 15 is returned to the initial position shown in FIG. Therefore, when the pressing of the eject button 14 is stopped, the button lever 36 and the operating lever 34 are returned to the initial positions (unloading positions) shown in FIGS. 10 and 11 by the biasing force of the return spring 35 (FIGS. 10 and 12). Be done.

As described above, the disk device of this embodiment is configured so that the upper head 17A and the lower head 17B can be simultaneously loaded on the upper surface and the lower surface of the medium (disk) in the disk cassette 11. It is configured. FIG. 16 shows the state where the cassette guide 15 and the heads 17A and 17B are in the unload position. In this state, the upper surface of the cassette guide 15 (the highest part) and the upper surface of the head arm 57 (the highest part). ) Have substantially the same height, that is, substantially the same plane. In addition, in this embodiment, as shown in FIG. 16, the gap between the upper surface of the cassette guide 15 and the cover 63 (FIG. 16) covering the open upper surface of the base 10 in this unloading state is set to be as small as possible. The height (thickness) of the disk device is configured to be as small as possible by slightly abutting the tip of the boom 57 on the cover 63. A projection 57a is provided at the tip of the head arm 57 to reduce sliding resistance with the cover 63.

As shown in FIGS. 1 and 2, a head seek mechanism 18 as shown in FIG. 16 is arranged in the region of the cutout portion 16 of the cassette guide 15. Next, the head seek mechanism will be described with reference to these drawings. In the illustrated example, the notch 16 is provided on the left side of the latter half of the cassette guide 15 over the approximately one-quarter area. However, in some cases, a notch corresponding to this is provided on the right side of the latter half. However, in this case, a mechanism corresponding to the head seek mechanism 18 is also provided in the cutout region on the right side.

In FIG. 1 and FIG. 2, in the space where the cassette loading mechanism 33 including the button lever 36 and the like is provided, that is, the cassette guide 15 is moved to one side (the right side in the illustrated example). The cassette loading mechanism 33 and the head seek mechanism 18 are arranged near the side edge (in the illustrated example) along the side edge of the disc cassette 11 in the insertion direction of the disc cassette 11. Has been done.

The head seek mechanism 18 is a drive shaft including a head driving motor (step motor) 51 fixed to the rear wall of the base 10 and a lead screw rotated by the motor 51 via a belt 52. 53, a head carriage 54 that engages with the lead groove of the drive shaft 53 and can reciprocate by the forward and reverse rotation of the drive shaft 53, and a guide bar that fits with the head carriage 54 and guides the head carriage 54. 55, a lower head 17B attached to the tip of the head carriage 54, a head arm 57 movably attached to the head carriage 54 through a leaf spring 56, and a tip of the head arm 57. The head 17A mounted on the upper part and the head arm 57 are urged downward (toward the head load position). And a spring 58 for head load. The upper head 17A is fixed to the head arm 57 by an adhesive 104 on the upper surface side as shown in FIG. 1 in order to make the device thin.

FIG. 20 is a partial vertical cross-sectional view showing a front end bearing structure of the drive shaft 53. In the figure, the drive shaft 53 is supported by a slide bearing 68 fitted in a vertical portion 10c formed by cutting and raising the base 10. Further, a sun ball 70a is brought into contact with a bearing seat surface formed on the tip end surface of the drive shaft 53, and the sun ball 70a is constantly urged toward the rear of the device by a leaf spring 69 fixed to the base 10. .

FIG. 21 is a partial vertical sectional view showing the rear end bearing structure of the drive shaft 53. In the figure, a pulley 66 to which the rotational force from the motor 51 is transmitted via a belt 52 is fixed to a support shaft portion 65 of the drive shaft 53. A support shaft portion 65 of the drive shaft 53 projects rearward from the pulley 66, and this projecting portion extends into a rotary bearing 67 fixed to the rear wall portion of the base 10. A sun ball 70b is brought into contact with a bearing seat surface formed on the tip end surface of the support shaft portion 65, while a plurality of sun balls 70b are brought into contact with the sun ball 70b as shown in the bearing (for example, 3 to 6 pieces). Individual planet balls 71 are provided. These planet balls 71 are held by a casing 72 that surrounds the outer sides thereof, thereby forming a rotary bearing 67 that supports both the radial load and the thrust load of the drive shaft 53.

Next, the drive mechanism of the head carriage 54 will be described in detail with reference to FIGS. 22 and 23.

The head carriage 54 (lower carriage 54b) is integrally provided with two engagement pins 101a and 101b which are always engaged with the drive shaft, that is, the lead groove 53a of the drive shaft 53 (by fixing a separate member). The head carriage 54 with the drive shaft 53 sandwiched therebetween, and the lead member is attached to the head carriage 54 by a pressing member 103 which is always fitted with a biasing force in the direction of the drive shaft 53 by the coil spring 102. It is pressed into the groove 53a and its engaged state is maintained.

With such a structure, as shown in FIG. 23, even if there is a fitting play δ between the head carriage 54 and the guide bar 55 that guides the head carriage 54, the posture of the device Regardless of this, it is possible to prevent inward displacement of the head.

That is, the engagement point between the engagement pin 101a and the lead groove 53a is Q, one inclination point due to the backlash δ between the head carriage 54 and the guide bar 55 is R ′, and an imaginary line connecting these points is L. Further, suppose that the engaging point between the engaging pin 101b and the lead groove 53a is P, the other tilt point due to the backlash δ between the head carriage 54 and the guide bar 55 is R, and the imaginary line connecting these points is L. Even if the head carriage 54 receives an inclination force with respect to the guide bar 55 due to its own weight due to the posture of the apparatus and tries to incline about the virtual intersection point O ′ of the imaginary lines L and L ′ as the center of rotation, the two lead grooves 53a are formed. Since the engaging pins 101a and 101b are fitted, the amount of tilt of the head carriage 54 can be extremely suppressed and the head position can be displaced regardless of the posture of the apparatus. Without, it is possible to obtain a high head positioning accuracy.

With the above configuration, a control circuit for controlling the recording / reproducing of the information of the disc device by the electric signal for the head 17 to record information on the disc 11a or the electric signal reproduced from the disc 11a. As shown in FIG. 24, the flexible printed circuit board FPC94 for transmitting between the heads comes out from the head 17 in the outer peripheral direction of the disk 11a at a time, and is bent inside the rear side wall of the base 10 to make a U-turn. Then, it is connected to the connector 32b on the circuit board 32 arranged on the upper side of the base 10. In this embodiment, in addition to downsizing the device, the device is made thin, and since the gap between the disk cassette 11 and the circuit board 32 is small, the FPC 94B coming out from the so-called zero-face head 17B on the lower side is bent. The bulge contacts the shutter 19 of the disc cassette 11. Therefore, in order to prevent the FPC from rubbing against the shutter 19 when the head seek device 18 seeks while the FPC 94B is in contact with the shutter 19, the surface of the FPC 94B that contacts the shutter 19 of the FPC 94B is prevented. It is a thin layer of grease that is composed of components that have no chemical effect on the grease.

When the output of the motor 51 is transmitted to the drive shaft 53 by the belt 52, as shown in FIG. 25, a spring 105 is provided between the output shaft 51 a of the motor 51 and a pulley 100 fixed to the output shaft 51 a. It is arranged so as to eliminate axial play between the motor 51 and the output shaft 51a. By adopting such a configuration, it is possible to prevent vibration due to axial play and step driving of the motor 51 and noise due to this vibration. Further, since the position of the pulley 100 is stabilized by the pressing force of the spring 105, the position of the pulley 100 does not change back and forth in the axial direction due to the axial play and the forward / reverse rotation of the motor 51. Therefore, the engagement state of the belt 52 with the pulley 100 is stable, and the belt 52 is prevented from coming off the pulley 100. The output of the motor 51 may be transmitted to the drive shaft 53 by a gear train.

Next, a track position adjusting method will be described with reference to FIGS. 4 and 26. As shown in FIG. 4, the drive motor 51 has a flange portion 51a for fixing the motor 51 and a flexible printed circuit board (FPC) 99 for electrically connecting the circuit board 32 and the motor 51 in an electric circuit. The terminal portion 51b to be attached is provided so as to protrude from the outer shape of the motor 51. The motor 51 is rotatably fixed by a mounting plate 106 fixed to the rear wall of the base 10 via a flange portion 51a. The track position adjustment for adjusting the reference position of the head 17 in the seek direction is performed by changing the fixed angular position of the motor 51. In this embodiment, the outer size of the motor 51 and the height of the disk device are made substantially the same in order to improve the seek performance of the seek mechanism 18 while making the disk device thin and compact. . Therefore, when adjusting the track position by changing the mounting angle of the motor 51, it is necessary to prevent the flange 51b and the terminal portion 51c from protruding from the thickness direction of the disk device, so that the motor 51 can be mounted. The angle range is narrow. That is, the adjustable range of the track position is narrowed.

For the above reason, in order to adjust the track position within a narrow track position adjustment range, the assembling accuracy of each component is improved. That is, the lower head 17B is positioned and fixed at a predetermined position with respect to either the engagement pin 101a or 101b provided on the head carriage 54. Further, the pulley 66 fixed to the drive shaft 53 is provided with a reference surface 66a, and when the head 17B is at a predetermined track position, the engagement pins 101a and 101b and the lead groove of the drive shaft 53 are provided. At the angular position of the drive shaft 53 where 53a is engaged, the pulley 66 is fixed by positioning so that the reference surface 66a has a predetermined angle. Further, the pulley 100 fixed to the output shaft 51a of the motor 51 is also provided with the reference surface 100a, and the motor 51 is excited in a predetermined excitation phase with respect to the terminal portion 51b of the motor 51. The pulley 100 is fixed so that the reference surface 100a has a predetermined angle. Further, the belt 52, which transmits power between the pulley 66 and the pulley 100, is hung so that the reference surface 66a of the pulley 66 and the reference surface 100a of the pulley 100 maintain a predetermined positional relationship. Has been.

Further, the FPC 99 is set to a length capable of absorbing the change in the position of the terminal due to the mounting angle of the motor 51. Further, as shown in FIG. 27, a convex portion 99a is formed on a part of the FPC 99. By providing the convex portion 99a between the upper surface of the rear wall of the base 10 and the cover 63, the floating of the FPC 99 is suppressed.

According to the embodiment described above, in the disc device that rotates the disc as the recording medium and records or reproduces information on the disc, a part of the base 10 is cut and raised, Since the positioning convex portion 84a for positioning the disc cassette 11 in the loading state and the positioning surface 84b are formed, the disc cassette can be positioned with a simple structure, and a low cost disc device is provided. I was able to.

[0056]

[Effect of device]

 As is clear from the above description, according to the present invention, the disk cassette can be positioned with a simple structure, and a disk device with low cost can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an unloaded state of an embodiment of a disk device to which the present invention is applied, with a cover removed.

FIG. 2 is a plan view showing a state when the disk device of FIG. 1 is loaded, with a cover removed.

FIG. 3 is a front view taken along line 3-3 in FIG.

FIG. 4 is a rear view taken along line 4-4 in FIG.

5 is a longitudinal sectional view taken along line 5-5 in FIG.

FIG. 6 is a partial plan view around the shutter with the front panel in FIG. 1 omitted.

FIG. 7 is a cross-sectional view of the cassette guide of this embodiment.

FIG. 8 is a front view of the cassette guide according to this embodiment.

9A and 9B are views showing the configuration on the bottom surface of the base of the disk device of FIG. 1, in which FIG. 9A is a plan view, FIG. 9B is a front view seen from the line BB in FIG. () Is a side view seen from line C-C in (A), and (D) is a vertical cross-sectional view seen from line D-D in (A).

FIG. 10 is a partial side view showing a state when the button lever in FIG. 1 is unloaded.

FIG. 11 is a partial side view showing a state when the operation lever and the cassette guide in FIG. 1 are unloaded.

FIG. 12 is a partial side view showing a state when the button lever in FIG. 2 is loaded.

FIG. 13 is a partial side view showing a state when the operation lever and the cassette guide in FIG. 2 are loaded.

14A and 14B are enlarged views of a main part of the present embodiment, where FIG. 14A shows an unloaded state of the cassette guide, and FIG. 14B shows a loaded state.

15 is an explanatory diagram of a disc cassette positioning state in FIG. 2. FIG.

16 is a longitudinal sectional view of a portion of the head seek mechanism taken along the line 10-10 in FIG.

FIG. 17 is an enlarged view of a main part of the present embodiment, in which (a) shows a state in which a bar for unloading a head arm is moving, and (b) shows a bottom portion of a bar holder engaged with a base. It shows the state.

FIG. 18 is a diagram showing a state of a finger pressing an eject button and a disc cassette at the time of ejecting in this embodiment.

FIG. 19 is a diagram showing a relationship between a stopper and an engaging portion in the present embodiment.

FIG. 20 is a partial cross-sectional view of the front end of the drive shaft in this embodiment.

FIG. 21 is a partial cross-sectional view of the rear end of the drive shaft in this embodiment.

FIG. 22 is a cross-sectional view showing the main parts of the head seek mechanism in this embodiment.

FIG. 23 is a plan view showing the main parts of the head seek mechanism in this embodiment.

24 is a side view showing details around the head seek mechanism as viewed from the direction of arrow A in FIG.

FIG. 25 is an enlarged explanatory view of a main part of the present embodiment.

FIG. 26 is an enlarged explanatory view of a main part as seen from the direction of arrow B in FIG.

FIG. 27 is an enlarged explanatory view of the essential parts showing the vicinity of the drive motor of the present embodiment.

[Explanation of symbols]

 10 base 11 disc cassette 14 eject button 15 cassette guide 16 notch (cassette guide) 17A upper head 17B lower head 18 head seek mechanism 31 disk drive motor 33 cassette loading mechanism 51 head drive motor 53 drive Axis (lead screw) 54 Head carriage 55 Guide bar 57 Head arm 58 Spring (for biasing head arm) 61 Bar (for lifting head arm) 90 Holder

Claims (2)

[Scope of utility model registration request] 1. A disk device for positioning by positioning a positioning member provided on a base into a positioning hole provided in a disk cassette, wherein the positioning member is formed by cutting and raising the base, Moreover, the disc cassette is positioned at one position by the positioning member. 2. The disc device according to claim 1, wherein the disc cassette is positioned by the positioning member in the insertion direction of the disc cassette.