Disk apparatus and disk magazine

Abstract: A disk apparatus comprising: a disk magazine (100) having a plurality of trays (110), each tray (110) having mounted therein a disk (D), said disk magazine (100) divided into upper and lower sections (120,130); a chassis unit (1) for mounting therein said disk magazine (100); a magazine dividing section for dividing and uniting said disk magazine (100) mounted in said chassis unit (1); a disk selecting section for selecting a desired disk (D); a swing unit (400) transferred into a space between the divided upper and lower sections (120,130) of said disk magazine (100); and a disk playback section (120,130) provided on said swing unit (400) for playing back the disk (D) selected by said disk selecting section; said chassis unit (1) is provided with a holding section (430) for holding the terminal end of said transferred swing unit (400).

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk apparatus which selects a desired disk from a disk magazine accommodating therein a plurality of disks for playback and/or recording. More particularly, the present invention relates to a disk apparatus which performs disk selecting and playback and/or recording with a disk magazine divided into upper and lower sections, thereby allowing components thereof to be arranged adjacent to each other so as to allow a reduction in size of the overall apparatus, and to a disk magazine used therewith. 2. Description of the Related Art In recent years, disk apparatuses, such as CD players and MD players, using disks as a medium, have become very popular. In particular, an auto-changer-type disk apparatus has been developed wherein a desired disk is selected from a disk magazine accommodating therein a plurality of disks for playback. The auto-changer-type disk apparatus is particularly convenient as a disk apparatus for use in a vehicle because there is no need to load and unload disks one by one each time the disks to be played are exchanged. In the disk apparatus of the type described above using a disk magazine, a disk playback section is arranged adjacent to a magazine accommodation section. In a large number of such disk apparatuses, a desired disk in a magazine is pulled out and transported by a transporting mechanism to the disk playback section to be set thereat, and then a disk playback is performed. With this arrangement, however, a certain distance must be provided between the disk playback section and the magazine accommodation section in order to conserve space for setting the disk to the disk playback section for playback. Accordingly, the overall disk apparatus must be of increased size, and the disk apparatus is disadvantageous as an in-vehicle apparatus in which a mounting space is restricted. For example, in a recent in-vehicle audio apparatus, the size of the opening for accommodating the equipment in vehicles has been standardized to 180 mm by 50 mm, called a "DIN size", or 180 mm by 100 mm, called a "double-DIN size". In addition, the depth of the opening is only about 160 mm at present, so that audio device-mounting space in a vehicle is restricted. Since compact disks are 120 mm in diameter, 240 mm (= 120 mm x 2) in the longest width direction is required for the above disk apparatus. Accordingly, the device cannot be accommodated in the opening located beside the driver's seat. In view of the foregoing circumstances, a conventional CD auto-changer is accommodated in the trunk of a vehicle, or near the foot of the driver's seat. In the former case, however, the trunk space is reduced, the trunk must be opened each time disks are exchanging, and a long line connecting the trunk and an operating section is required. In the latter case, there is a risk that foot space will be reduced, resulting in breakage of the auto-changer when accidentally impacted by the driver's foot. In order to cope with the above problems. Japanese Unexamined Patent Publication No. 6-203519 discloses a disk apparatus in which a disk magazine is divided into upper and lower sections, and disk playback is performed with a disk playback section transferred therebetween. In such a disk apparatus, a disk accommodation position overlaps a disk playback position, so that a horizontal dimension can be reduced. The disk playback section is usually provided on a swing unit that rotates about a rotation shaft. Thus, when the swing unit is transferred into a space between the vertically divided disk magazines, the disk playback section is supported only by a rotation support of the swing unit, and is easily affected by vibrations. Accordingly, the disk apparatus is disadvantageous as the in-vehicle disk apparatus. US patent 5,481,512 being the closest prior art from which the present invention starts, discloses a magazine for accommodating a plurality of disks and an automatic disk player employing the magazine from which a desired disk to be played by the player is automatically selected and separated from the magazine. The magazine comprises a plurality of stacked wafers for holding the plurality of disks and a coupling device for separately coupling the wafers forming the magazine. The wafers include a plurality of trays each of which comprises a disk clamping device for releasably holding each of the disks on a bottom surface of each tray. When the magazine is loaded into the automatic disk player, the coupling device is activated to separate the wafers for providing at least a predetermined space between the wafers and for allowing a disk playing device of the player to enter into the predetermined space, wherein the disk clamping device releases one of the disks held by the disk clamping device of the tray selected by the player so that a released disk is transferred to a turntable of the disk playing device to be played. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a disk apparatus which can more firmly hold a swing unit provided with a disk playback section, and which is resistant to vibrations during playing back of the disk. In accordance with an aspect of the present invention, there is provided a disk apparatus including a disk magazine having a plurality of trays, each tray having mounted therein a disk, the disk magazine divided into upper and lower sections, a chassis unit for mounting therein the disk magazine, a magazine dividing section for dividing and uniting the disk magazine mounted in the chassis unit, a disk selecting section for selecting a desired disk, a swing unit transferred into a space between the divided upper and lower sections of the disk magazine, and a disk playback section provided on the swing unit for playing back the disk selected by the disk selecting section, wherein the chassis unit is provided with a holding section for holding the terminal end of the transferred swing unit and wherein the disk apparatus further includes a hold arm for holding an end of the swing unit opposite to the terminal end held by the holding section when the swing unit is transferred. In accordance with the described arrangements, the terminal end of the swing unit is supported by the holding section during the disk playback. Thus, the swing chassis is supported by a rotation support and the holding section, and is hardly affected by vibrations. Moreover, the terminal end of the swing unit is held by the holding section, and the opposite end thereof is held by the hold arm during the disk playback. Thus, the swing unit is supported by the rotation support, the holding section, and the hold arm, and is more hardly affected by vibrations. The disk apparatus in accordance with the present invention may further include a hold plate for pressing the hold arm in the direction to hold the swing unit when the swing unit is transferred. In accordance with the described arrangement, the swing unit is supported by the rotation support, the holding section, and the hold arm, and the hold plate presses the hold arm during the disk playback. Thus, the swing unit is held more firmly. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a disk apparatus in accordance with an embodiment of the present invention as viewed from the front; FIG. 2 is an external perspective view of a disk apparatus shown in FIG. 1 as viewed from the rear; FIG. 3 is an external perspective view showing a disk magazine in accordance with the embodiment of the present invention; FIG. 4 is a perspective view of a tray accommodated in the disk magazine shown in FIG. 3, as viewed from the top surface thereof; FIG. 5 is a perspective view of a magazine upper section constituting the disk magazine shown in FIG. 3, as viewed from the rear surface thereof ; FIG. 6 is a perspective view of a magazine lower section constituting the disk magazine shown in FIG. 3, as viewed from the top surface thereof; FIG. 7 is a vertical section showing a united state of an upper slit section and a lower slit section in the disk magazine shown in FIG. 3; FIG. 8 is a partially transparent plan view showing a magazine shift unit of the embodiment shown in FIG. 1; FIG. 9 is a front view of the magazine shift unit shown in FIG. 8; FIG. 10 is a right-hand side view showing a magazine holder of the magazine shift unit shown in FIG. 8; FIG. 11 is a left-hand side view showing the magazine holder of the magazine shift unit shown in FIG. 8; FIG. 12 is a right-hand side view showing a magazine shift plate of the magazine shift unit shown in FIG. 8; FIG. 13 is a partially transparent plan view showing a vertical tracking unit and a magazine eject unit in a magazine ejected state of the embodiment shown in FIG. 1; FIGS. 14A to 14C illustrate the vertical-tracking unit and a loading gear for driving the magazine eject unit, in which FIG. 14A is a top view, FIG. 14B is a side view, and FIG. 14C is a bottom view; FIG. 15 is a rear elevation showing a rear shift plate of the vertical-tracking unit shown in FIG. 13; FIG. 16 is a left-hand side view showing a left shift plate of the vertical-tracking unit shown in FIG. 13; FIG. 17 is a partially transparent plan view showing a drive unit on the vertical-tracking unit shown in FIG. 13; FIG. 18 is a rear elevation showing the drive unit shown in FIG. 17; FIG. 19 is a plan view showing a brush switch of the drive unit shown in FIG. 17; FIGS 20A to 20C illustrate a cam gear of the drive unit shown in FIG. 17 in which FIG. 20A is a top view, FIG. 20B is a side view, and FIG. 20C is a bottom view; FIG. 21 is a partially transparent plan view showing a swing unit in the embodiment shown in FIG. 1; FIG. 22 is a right-hand side view showing a chassis unit in the embodiment shown in FIG. 1; FIG. 23 is a plan view showing a drive unit in the embodiment shown in FIG. 1; FIG. 24A is a vertical section showing a disk insertion section in the drive unit shown in FIG. 23, FIG. 24B is a vertical section showing rotation of a disk hook, and FIG. 24C is a vertical section showing the overall configuration of a turntable ; FIG. 25 is a partially transparent plan view showing a floating lock mechanism in the embodiment shown in FIG. 1; FIG. 26A is a right-hand side view and FIG. 26B is a left-hand side view each showing a floating locked state of the drive unit shown in FIG. 23; FIG. 27 is a plan view showing the arrangement of switches in the embodiment shown in FIG. 1; FIG. 28 is a transparent plan view of the disk magazine shown in FIG. 3; FIG 29 is a partially transparent plan view showing a state in which the magazine shown in FIG. 1 is pulled in; FIG. 30 is a plan view showing the positional relationship between the tray and the swing unit when the magazine is mounted in the embodiment shown in FIG. 1: FIG. 31 is a left-hand side view showing the positional relationship between the tray and the swing unit when the magazine is mounted in the embodiment shown in FIG. 1; FIG. 32 is a plan view showing a position of a tray gear during a magazine unlocking operation in the embodiment shown in FIG. 1: FIG. 33 is a vertical section showing positions of tray-supporting pawls during a magazine unlocking operation in the embodiment shown in FIG. 1; FIG. 34 is a vertical section showing the tray during the magazine unlocking operation in the embodiment shown in FIG. 1; FIG. 35 is a plan view showing a position of the tray gear upon completion of the magazine unlocking operation in the embodiment shown in FIG. 1; FIG. 36 is a front view showing a magazine divided state in the embodiment shown in FIG. 1; FIG. 37 is a vertical section showing the upper slit section and the lower slit section in the magazine divided state in the embodiment shown in FIG. 1; FIG. 38 is a partially transparent plan view showing the transferred swing unit in the embodiment shown in FIG. 1; FIG. 39 is a vertical section showing a disk released state in the embodiment shown in FIG. 1; FIG. 40 is a front view showing a disk chucked state in the embodiment shown in FIG. 1; FIG. 41 is a left-hand side view showing the positions of the drive unit and the tray when the disk is chucked in the embodiment shown in FIG. 1; and FIG. 42 is a plan view showing a position of the tray gear upon completion of release of the disk in the embodiment shown in FIG. 1. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS. 1 to 42. (1) Configuration 1. Overall configuration As shown in FIGS. 1 and 2, a disk apparatus of this embodiment is configured by the following units provided on a chassis unit 1 in which a casing 100 of a disk magazine is mounted. (a) A magazine shift unit 200 for dividing the magazine casing 100 into upper and lower sections to conserve a playback space therebetween; (b) a vertical-tracking unit 300 for selecting a target disk D; (c) a swing unit 400 which is provided on the vertical-tracking unit 300, and transferred into the playback space formed between the divided magazine casing 100; (d) a drive unit 500 which is provided on the swing unit 400, and includes an optical pickup; and (e) a magazine eject unit 600 (see FIG. 13) for ejecting the magazine casing 100. Configurations of these units will be described below in detail. 2. Disk magazine First, a configuration of a disk magazine will be described with reference to FIGS. 3 to 6. Bold arrows in FIGS. 3 to 6 indicate an insertion direction for the magazine casing 100 into a chassis unit 1. That is, as shown in FIG. 3, the inside of the magazine casing 100 is partitioned by five trays 110 for individually holding and accommodating a disk D. The magazine casing 100 is provided so as to be divided into a magazine upper section 120 and a magazine lower section 130. Configurations of these components are as follows. (Trays 110) The trays 110 for partitioning the inside of the magazine casing 100 are thin-wall disc-shaped members, as shown in FIG. 4. Each tray 110 has two tray-supporting pawls 111 formed at two opposite sections of the periphery thereof (upper and lower ends in the drawing) to project outwards. Two planetary gears 112 are rotatably mounted inside of the two tray-supporting pawls 111, respectively. Each of the two planet gears 112 has a disk-supporting pawl 112a for supporting the lower surface of the disk D loaded on the tray 110. A projection 116 is provided at an end of the tray 110 in the magazine insertion direction (the direction shown by the bold arrow in FIG. 4). A gear groove 116a is formed in a distal end of the projection 116. A wavelike first groove 114 is formed between the projection 116 and the tray-supporting pawl 111 near the projection 116. A wavelike second groove 115 is formed near the opposite tray-supporting pawl 111. Furthermore, a circular control section 113 against which the periphery of the disk D abuts is formed at the left semicircular section of the tray 110 shown in FIG. 4. Another tray-supporting pawl 111 is formed near the intermediate section of the semicircular section. (Magazine upper section 120) The configuration of the magazine upper section 120 will be described with reference to FIG. 5. FIG. 5 is a perspective view of the magazine upper section 120 as viewed from the rear thereof. That is, the magazine upper section 120 consists of an upper plate 121 and a side plate 122. One of the substantially square corners of the upper plate 121 is formed into a circular shape. The side plate 122 has an L-shape in cross section, and is provided on three corners of the upper plate 121 except the circular corners. A curved side wall 122a against which the periphery of the tray 110 abuts is formed inside each of the three side plates 122. An upper slit section 123 is provided on the upper plate 121 at a position corresponding to each of the three corners thereof for supporting the tray 110 on the side of the magazine upper section 120. Each of the upper slit sections 110 has a slit 123a through which each of the tray-supporting pawls 111 is inserted. The number of the slits 123a is the same as that of the trays 110. In this embodiment, five slits 123a are provided. Of these slits 123a, the uppermost slit 123a is formed to be the longest. Gear grooves 123c with which the planet gear 112 is engaged are formed in each of partitions 123b of the opposing two upper slit sections 123. The gear grooves 123c are formed near the end opposite from the end of an opening into which the tray-supporting pawl 111 is inserted. The upper plate 121 has a tray hold arm 124 rotatably provided inside one of the opposing side plates 122. The tray hold arm 124 is biased by a torsion coil spring 124a in the direction in which its terminal end engages with the first groove 114 of the tray 110. Disk ejection levers 125 are provided on the opposite corner of the circular corner on the upper plate 121 for manually individually ejecting the disks D accommodated between the trays 110. The number of the disk ejection levers 125 is the same as that of the disks D accommodated. In this embodiment, five disk ejection levers 125 are provided. Each disk ejection lever 125 is rotatably provided, and is biased by a helical extension spring 125a in the direction in which its terminal end moves away from the disk D. Guide holes 126 are formed nearby the tray hold arm 124 and the disk ejection levers 125, respectively, through which guide shafts 3 to be described later are inserted. (Magazine lower section 130) The magazine lower section 130 consists of a lower plate 131 having the same shape as the upper plate 121, as shown in FIG. 6. A lower slit section 132 for holding the tray 110 on the side of the magazine lower section 130 is provided on the lower plate 131 at a position corresponding to each of the three upper slit sections 123 of the magazine upper section. Each of the lower slit sections 132 has a slit 132 a through which each of the tray-supporting pawls 111 is inserted. The number of the slits 132a is the same as that of the trays 110. In this embodiment, five slits 132a are provided. Of these slits 132a, the uppermost slit 132a is formed to be the shortest. The five slits 132a of each of the lower slit sections 132 form a horizontally continuous five-stage slit together with the five slits 123a of each of the upper slit sections 123 when the magazine upper section 120 and the magazine lower section 130 are united. A disk hold arm 133 is rotatably provided at a corner of the magazine lower section 130 in the magazine insertion direction indicated by the arrow in FIG. 6. The disk hold arm 133 is located on the opposite side of the tray hold arm 124 of the magazine upper section 120, and is urged by a torsion coil spring 133a in the direction in which its terminal end engages with the second groove 115 of the tray 110. A rectangular recess 131a is formed in the outer bottom surface of the lower plate 131. 3. Magazine shift unit 200 A configuration of the magazine shift unit 200 for lifting the magazine upper section 120 to divide the magazine casing 100 will be described with reference to FIGS. 8 to 12. In FIG. 8, the upper side is regarded as the rear, and the downward side is regarded as the front. The magazine shift unit 200 comprises a magazine holder 210, a cylindrical cam 220, a synchronous gear 230, and a magazine shift plate 240. Configurations of these components are as follows. (Magazine holder 210) The magazine holder 210 is a member obtained by bending a flat plate into a U-shape in cross section so as to cover the upper plate 121 of the magazine upper section 120 and both sides thereof, as shown in FIGS. 8 and 11, and the top surface thereof is formed into substantially the same shape as the magazine upper section 121. The magazine holder 210 is provided in the chassis unit 1 so as to slide up and down. A frame-like magazine insertion opening 2 is provided in front of the chassis unit 1 so as to surround the front end of the magazine holder 210. Guide shafts 3, each projecting vertically downward, are fixed to the left and right of the ceiling part of the magazine insertion opening 2. Two insertion holes 210a are formed in the top plate of the magazine holder 210 through which the guide shafts 3 are inserted without contacting the holes 210a when the magazine holder 210 moves up and down. In addition, upper gripping pawls 210b for gripping the upper plate 121 of the inserted magazine upper section are provided inside of both side surfaces of the magazine holder 210. On the other hand, lower gripping pawls 2a for gripping the lower plate 131 of the inserted magazine lower section 130 are provided on left and right inner surfaces of the magazine insertion opening 2 of the chassis unit 1. Return sections 210c and 2b, each opening outside, are formed at the front end of the magazine holder 210 and the front end of the bottom surface of the magazine insertion opening 2, respectively. As shown in FIGS. 12 and 8, two holder guide pins 211 are provided on the right side surface of the magazine holder 210, and one holder guide pin 211 is provided on the left side surface of the magazine holder 210. The right two holder guide pins 211 are slidably inserted into right-hand holder guide grooves 1a, respectively, formed in the chassis unit 1. The right-hand holder guide grooves 1a is formed in the right side surface of the chassis, unit 1 in two rows in the vertical direction. The left holder guide pin 211 is slidably inserted into a left-hand holder guide groove 2c formed in the magazine insertion opening 2. The left-hand holder guide groove 2c is formed in the left side surface of the magazine insertion opening 2 in one row in the vertical direction. In addition, a tray guide 212 is provided on the rear of the magazine holder 210, as shown in FIGS. 9 and 11. The tray guide 212 is an inverted L-shaped member, and a horizontal section thereof is fixed by screws to the top surface of the magazine holder 210. A number of slits 212a corresponding to the number of the trays 110 are formed on a vertical section of the tray guide 212, and the rotated projections 116 of the trays 110 enter into the slits 212a. (Cylindrical cam 220) The cylindrical cam 220 is provided on the left side of the magazine insertion opening 2 of the chassis unit 1 so as to be rotatable around a vertical axis. A helical cam 220a is formed around the cylindrical cam 220, and engages with the holder guide pin 211 of the magazine holder 210. A worm wheel 220b is formed around the lower section of the cylindrical cam 220. The worm wheel 220b engages with a worm 221a for transmitting a driving force of a magazine shift motor 221 mounted to the chassis unit 1, thereby forming a worm gear. A disk-like gear 220c, which is a spur wheel, is formed at the lowermost end of the cylindrical cam 220. (Synchronous gear 230) The synchronous gear 230 consists of a first disk section 232 and a second disk section 232 provided on the outer bottom surface of the chassis unit 1, as shown in FIG. 8. The first and second disk sections 231 and 232 are arranged adjacent to each other so as to be rotatable about the center axes thereof, respectively. The first disk section 231 has a circular gear 231 that engages with the disk-like gear 220c of the cylindrical cam 220, and a circular gear 231b formed at a position opposing the circular gear 231a. The second disk section 232 has a circular gear 232a that engages with the circular gear 231b of the first disk section 231, and a circular gear 232b formed at a position opposed to the circular gear 232a. Degrees of rotation of the first and second disk sections 231 and 232 are controlled so that the circular gear 231b will not disengaged from the circular gear 232a. (Magazine shift plate 240) The magazine shift plate 240 is provided on the right side surface of the chassis unit 1 so as to slide back and forth. Two inclined cams 242 are formed in parallel with each other in a vertical surface of the magazine shift plate 240. Each of the inclined cams 242 has a inclined linear shape such that it gradually descends rearwards. The holder guide pins 211 of the magazine holder 210 are slidably inserted into the inclined cams 242. The magazine shift plate 240 is bent at its lower end along a corner of the bottom surface of the chassis unit 1 to form a horizontal surface, as shown in FIG. 8, and a magazine-shifting rack 241 is formed on the left edge of the horizontal surface. The magazine-shifting rack 241 is engaged with the circular gear 232b of the second disk section 232. 4. Vertical-tracking unit 300 The configuration of the vertical-tracking unit 300 for determining a divide position of the magazine casing 100 in order to select the disk D to be played back will be described with reference to FIGS. 13 to 20. In FIG. 13, the upside is regarded as the rear, and the downside is regarded as the front. The vertical-tracking unit 300 consists of a loading gear 310, a rear shift plate 320, a link plate 330, left shift plate 340, an vertical-tracking chassis 350, and a drive unit 360. Configurations of these components are as follows. (Loading gear 310) The loading gear 310 is provided at the rear right corner of the bottom surface of the chassis unit 1, as shown in FIG. 13. The loading gear 310 is of a three-stage construction, as shown in FIGS. 14A to 14C in which an upper gear 310a having a non-toothed portion of about a three-quarter circle, an intermediate gear 310b having a spur gear formed therearound, and a lower gear 310c having a non-toothed portion of about a half circle are formed in one piece. A driving force of a loading motor 311 mounted on the chassis unit 1 is transmitted to the intermediate gear 310b via transmission gears 311a. (Rear shift plate 320) The rear shift plate 320 is provided on the rear side surface of the chassis unit 1 so as to slide in a lateral direction, as shown in FIG. 13. The rear shift plate 320 is bent at its lower end along a corner of the bottom surface of the chassis unit 1 to form a horizontal surface, and a vertical-shifting rack 321 is formed on the front edge of the horizontal surface. The vertical-shifting rack 321 is provided at the height where it engages with the lower gear 310c of the loading gear 310. In addition, two rear stepped cams 322 gradually descending from the right to the left are formed on a vertical surface of the rear shift plate 320, as shown in FIG. 15. (Link plate 330) The link plate 330 is a fan-shaped member, as shown in FIG. 13, and is rotatably provided at its peak 331 on the outer bottom surface of the chassis unit 1. In addition, the link plate 330 is rotatably connected at a rear end of its circular-arc section to the left end of the horizontal surface of the rear shift plate 320. (Left shift plate 340) The left sift plate 340 is provided on the left-hand side surface of the chassis unit 1 so as to slide back and forth, as shown in FIG. 13. The left shift plate 340 is bent along a corner of the bottom surface of the chassis unit 1 to form a horizontal surface, and a front end of the circular-arc section of the link plate 330 is rotatably connected to the rear end of the horizontal surface. A left stepped cam 341 descending rearwards is formed on a vertical surface of the left shift plate 340, as shown in FIG. 16. (Vertical-tracking chassis 350) The vertical-tracking chassis 350 is a substantially L-shaped horizontal plate extending from the rear side to the left side of the chassis unit 1. The vertical-tracking chassis 350 is provided in the chassis unit 1 so as to slide up and down. As shown in FIG. 15, the arrangement is such that a vertical surface along the rear side surface of the chassis unit 1 is formed on the rear of the vertical-tracking chassis 350, two vertical-guiding pins 351 are provided on the vertical surface, and these vertical-guiding pins 351 are slidably inserted into the two rear stepped cams 322 formed in the rear shift plate 320, respectively. In addition, a vertical surface along the left side surface of the chassis unit 1 is formed on the left of the vertical-tracking chassis 350, and one vertical-guiding pin 351 is provided on the vertical surface, as shown in FIG. 16. The vertical-guiding pin 351 is slidably inserted into a left stepped cam 341 formed in the left shift plate 340. (Drive unit 360) The drive unit 360 for rotating the tray 110 is provided on the vertical-tracking chassis 350, as shown in FIGS. 17 and 18. The drive unit 360 consists of a driving motor 361, transmission gears 362, a mode gear 363, a brush switch 364, a cam gear 365, a tray gear 366, and a tray gear arm 367. The transmission gears 362 comprise a plurality of gears for transmitting a driving force of the driving motor 361 to the mode gear 363. The mode gear 363 is a disk-like spur gear for transmitting the driving force from the transmission gears 362 to the cam gear 365. As shown in FIG. 19, the mode gear 363 is provided with the brush switch 364 that rotates coaxially and in synchronism with the mode gear 363. The brush switch 364 has contacts v to z that are set to detect an operation stage of the apparatus in accordance with the rotation position of the mode gear 363. More specifically, the contact v corresponds to a standby state of a swing chassis 420, w corresponds to the unlocking of the magazine casing 100, x corresponds to the completion of transferring of the swing chassis 420, y corresponds to the release of the disk D from the disk-supporting pawl 112a, and z corresponds to the release of a floating lock of a drive base 510. The cam gear 365 comprises an upper gear 365a that is a disk-like spur gear integrally formed with a lower gear 365b having two non-toothed portions, as shown in FIGS. 20A to 20C. The upper gear 365a engages with the mode gear 363. A ring-like operating cam groove 365c is formed in the top surface of the upper gear 365b. The operating cam groove 365c has two axially curved U-shaped sections 365d. The tray gear 366 is a columnar gear having a height substantially equal to the thickness of the magazine casing 100, as shown in FIGS. 17 and 18. The tray gear 366 is provided on the front end of the L-shaped tray gear arm 367 so as to rotate about a vertical axis, and meshes with the upper gear 365a of the cam gear 365. The rear end of the tray gear arm 367 is rotatably provided on the drive unit 360. A tray gear arm-rotating pin 367a is attached near the rear end of the tray gear arm 367. The tray gear arm-rotating pin 367a is engaged with the operating cam groove 365c of the cam gear 365. 5. Swing unit 400 The swing unit 400 transferred into the space between the divided magazine casing 100 will now be described with reference to FIGS. 21 and 22. In FIG. 21, the upper side is regarded as the rear, and the downward side is regarded as the front. The swing unit 400 consists of a power plate 410, a swing chassis 420, and a holding mechanism 430. Configurations of these components are as follows. (Power plate 410) The power plate 410 is provided on the outer bottom surface of the vertical-tracking chassis 350 so as to slide in a lateral direction. A transferring rack 411 that engages with the lower gear 365b of the cam gear 365 is formed on the front edge near the right end of the power plate 410. A columnar power roller 412 is fixed near the center of the power plate 410. A lateral holding cam 413 is formed near the left end of the power plate 410. The holding cam 413 has a stepped portion formed in the middle thereof including a rear horizontal section 413a and a front horizontal section 413b. (Swing chassis 420) The swing chassis 420 is a substantially triangular plate provided on the vertical-tracking chassis 350. The swing chassis 420 is provided so that it can rotate around a transfer-rotation shaft 421 that is provided near the right end of thereof. A hook-like cutout 422 is formed at the right end of the swing chassis 420. The power roller 412 provided on the power plate 410 is engaged with the hook-like cutout 422. A holding projection 423 is provided near the left end portion of the rear surface of the swing chassis 420. An abutting pawl 424 is formed on the front end of the swing chassis 420. On the other hand, a V-shaped slit 6 is formed in the right side surface of the chassis unit 1, as shown in FIG. 22, so as to be engaged with the abutting pawl 424 when the swing chassis 420 is transferred. A plurality of V-shaped slits 6 is formed in accordance with the change in height of the swing chassis 420. (Hold mechanism 430) The hold mechanism 430 consists of a hold arm 431, a hold link 432, and a hold plate 433, as shown in FIG. 21. The hold arm 431 is an L-shaped plate, and its front end is rotatably provided near the front end section of the vertical-tracking chassis 350. A hold opening 431a, which engages with the holding projection 423 of the transferred swing chassis 420, is formed in the rear end of the hold arm 431. The hold arm 431 is biased by a helical extension spring 431b so that it can rotate clockwise. However, as shown in FIG. 21, since the hold arm 431 is pressed to the left side surface of the swing chassis 420 in the case of a standby state of the swing chassis 420, the hold arm 431 rotates counterclockwise against the biasing force of the helical extension spring 431b so as to be held on the left side surface of the chassis unit 1. The hold link 432 is rotatably mounted on the outer bottom surface of the vertical-tracking chassis 350. A hold link pin 432a is provided on the rear end of the hold link 432. The hold link pin 432a is inserted into the holding cam 413 of the power plate 410. The left end of the hold link 432 is rotatably coupled to the rear end of the hold plate 433. The hold plate 433 is provided on the outer bottom surface of the vertical-tracking chassis 420 so that it can slide back and forth. A presser section 433a for abutting and pressing the rear end of the rotated hold arm 431 is provided on the front end of the hold plate 433. 6. Drive unit 500 The drive unit 500 for playing back the selected disk D will now be described with reference to FIGS. 23 to 26. In FIGS. 23 and 25, the upper side is regarded as the rear, and the downward side is regarded as the front. The drive unit 500 consists of a drive base 510, a turntable 520, an optical pickup 530, a feed mechanism 540, and a floating lock mechanism 550. Configurations of these components are as follows. (Drive base 510) The drive base 510 is supported by three dampers 511 on the swing chassis 420, as shown in FIG. 23. A conical projection 510a is formed on the left side surface, and two conical projections 510a are formed on the right side surface of the drive base 510. A tray guide projection 512, which abuts against an end of the tray 110 accommodated in the magazine upper section 120 when transferred into the divided magazine casing 100, is provided on the upper surface of the rear left corner of the drive base 510. (Turntable 520) The turntable 520 is mounted to the drive base 510, as shown in FIGS. 23 and 24A. The turntable 520 is provided so as to be turned by a spindle motor 521. A convex cylindrical cross-section sleeve 522 is provided around the rotation shaft of the turntable 520, as shown in FIGS. 24B and 24C. The sleeve 522 is biased upward by a spring 523. A ring-like disk insertion section 524 to be inserted into a center hole of the disk D is provided around the sleeve 522. Three disk hooks 525 are provided at equal intervals for hooking up to the hole of the inserted disk D and holding the disk D. A protruded hooking section 525a to be hooked up to the hole of the disk D is formed on the outside of the upper end of each disk hook 525. Each disk hook 525 is rotatably provided using its outside of the lower end as a fulcrum 525b. Since the lower end of the sleeve 522 abuts against the inside of the lower end of each of the disk hook 525 from below, each disk hook 525 is biased by the spring 523 so that its hooking section 525a opens outside. (Optical pickup 530 and feed mechanism 540) As shown in FIG. 23, the optical pickup 530 and the feed mechanism 540 therefor are mounted on the drive base 510. The optical pickup 530 is an optical head including a lens for optically reading information recorded in the disk D. The feed mechanism 540 is a mechanism for slidably moving the optical pickup 530 in a radial direction of the disk D on the turntable 520. That is, the optical pickup 530 is slidably provided on the guide rail 541 and a feed screw 542 arranged in parallel with each other. The feed screw 52 is constructed to rotate in accordance with the operation of a feed motor 543. (Floating lock mechanism 550) The floating lock mechanism 550 is a mechanism for locking a floating state of the drive base 510 supported by the dampers 511, as shown in FIG. 25. The floating lock mechanism 550 consists of a lock link 551, a first lock plate 552, a second lock plate 553, a reverse link 554, and a helical extension spring 555. The lock link 551 is a plate rotatably provided near the hook-like cutout 422 of the swing chassis 420. The rear right end of the lock link 551 is located at a position to abut against the power roller 412 of the power plate 410. The front end of the lock link 551 is rotatably coupled to the right end section of the first lock plate 552. The first lock plate 552 is a plate provided on the swing chassis 420 so as to slide in a lateral direction. A vertical surface is formed on the right-hand end of the first lock plate 552. Two locking holes 552a into which the two conical projections 510a are inserted are formed in the vertical surface. A tray guide surface 552b, which abuts against an end of the tray 110 at the time of rotation of the tray 110 in the magazine casing 100, is provided between the two locking holes 552a. On the other hand, the second lock plate 553 is provided on the swing chassis 420 so as to slide in a direction parallel to the first lock plate 552. A vertical surface is formed on the left-hand end of the second lock plate 553. A locking hole 553a into which the conical projection 510a formed on the left of the drive base 510 is inserted is formed in the vertical surface. The reverse link 554 is rotatably provided between the first and second lock plates 552 and 553 of the swing chassis 420. The rear end of the reverse link 554 is rotatably coupled to the first lock plate 552. The front end of the reverse link 554 is inserted into a concave cutout 553b formed in the second lock plate 553. Accordingly, since the action of the first lock plate 552 is transmitted as an action in the reverse direction to the second lock plate 553 via the reverse link 554, the lock plates 552 and 553 are operatively associated with each other to slide in the reverse direction. Furthermore, hooks 552c and 553c are provided on the swing chassis 420 and the second lock plate 553, respectively, and both ends of a helical extension spring 555 engage with the hooks 552c and 553c, so that the second lock plate 553 is biased in a direction to approach the first lock plate 552. The floating lock mechanism 550 and the drive base 510 in a floating locked state are arranged as follows. The drive base 510 is arranged between the vertical surfaces of the first lock plate 552 and the second lock plate 553 on the swing chassis 420. Since these vertical surfaces are biased by the biasing force of the helical extension spring 555 in a direction to approach each other, the conical projections 510a of the drive base 510 are inserted into the locking holes 552a and 553a formed in the vertical surfaces. Accordingly, the drive base 510 is gripped from both sides by the vertical surfaces of the first and second lock plates 552 and 553, and its action is restricted by the locking holes 552a and 553a into which the conical projections 510a are inserted. 7. Magazine eject unit 600 The magazine eject unit 600 for ejecting the magazine casing 100 from the chassis unit 1 will now be described with reference to FIG. 13. In FIG. 13, the upper side is regarded as the rear, and the downward side is regarded as the front. The magazine eject unit 600 consists of a loading plate 610, a loading arm 620, and an ejecting member 630. Configurations of these components are as follows. (Loading plate 610) The loading plate 610 is a substantially L-shaped plate provided on the outer bottom surface of the chassis unit 1 so as to slide in a lateral direction. A small rack 611 that engages with the upper gear 310a of the loading gear 310 is formed near the rear right end section of the loading plate 610. In addition, a substantially rectangular cut-out section 612 is formed in the front of the loading plate 610. A recess 612a is formed at the rear right corner, and a hook 612b is formed at the front right corner in the cut-out section 612. (Loading arm 620) The loading arm 620 is rotatably mounted at a position to overlap the loading plate 610 on the outer bottom surface of the chassis unit 1. A presser pawl 621 is formed on the right end of the loading arm 620. A projection 622 is provided near the rotation shaft of the loading arm 620 so as to be engaged with the recess 612a of the loading plate 610. A hook 623 is provided on the left of the projection 622 of the loading arm 620. Both ends of the helical extension spring 640 are engaged with the hook 612b of the loading plate 610 and the hook 623 of the loading arm 620. The left end of the loading plate 610 is rotatably coupled to the rear end of the ejecting member 630. (Ejecting member 630) The ejecting member 630 is provided on the chassis unit 1 so as to slide back and forth. A catching section 631 is provided on the front end section of the ejecting member 630 so that it engages with the recess 131a formed in the outer bottom surface of the magazine lower section 130 when the magazine casing 100 is inserted. 8. Arrangement of switches On the chassis unit 1, switches 10 to 14 and 16 and sensors 15 for switching the start of the magazine shift motor 221, loading motor 311, driving motor 361, spindle motor 521, and feed motor 543 are arranged as follows. As shown in FIG. 27, a loading start switch 10 is provided at the rear of the right side surface of the chassis unit 1. The loading start switch 10 abuts against the presser pawl 621 of the loading arm 620, thereby detecting arrival of the inserted magazine casing 100 at a pulling-in start position. An ejection end switch 11 is provided on the chassis unit 1 at the rear of the loading start switch 10. The ejection end switch 11 abuts against the presser pawl 621, thereby detecting the completion of ejection of the magazine casing 100. In addition, a magazine close switch 12, a chucking switch 13, and a magazine open switch 14 are provided on the right side surface of the chassis unit 1, in that order, from the front. These switches 12, 13, 14 detect the height of the magazine holder 210 from the position of the magazine shift plate 240. That is, the height of the magazine holder 210 is set to three levels: a magazine insertion-ejection position (the lowest position), a disk chucking position (an intermediate position), and a magazine full-open position (the highest position). The above-described switches 12, 13, 14 are arranged so that they can detect the positions of the magazine shift plate 240 in accordance with the positions of the magazine holder 210. More specifically, the magazine close switch 12 detects the lowest position, the chucking switch 13 detects the intermediate position, and the magazine open switch 14 detects the highest position. A photodetector 15 for detecting vertical movement of the vertical-tracking chassis 350, and a standby switch 16 for detecting a standby condition of the swing unit 400 are provided on the left side of the chassis unit 1, in that order, from the rear thereof. (2) Operation The embodiment includes the following operations. (a) Magazine loading operation When the user inserts the magazine casing 100 from the magazine insertion opening 2 of the chassis unit 1, the magazine casing 100 is pulled into the chassis unit 1 by the magazine eject unit 600. (b) Disk selecting operation The vertical-tracking chassis 350 is moved upward by the vertical-tracking unit 300 to select the dividing position of the magazine casing 100. (c) Magazine unlocking operation The tray 110 is rotated by the tray gear 366 of the drive unit 360 to unlock the magazine upper section 120 and the magazine lower section 130. (d) Magazine dividing operation The magazine holder 210 is moved upward by the magazine shift unit 200 to lift the magazine upper section 120, and the disk magazine is divided into the magazine upper section 120 and the magazine lower section 130 to conserve a transfer space for the swing unit 400. (e) Swing unit transferring operation The swing chassis 420 is transferred into a space between the magazine upper section 120 and the magazine lower section 130 by the swing unit 400. (f) Disk chucking operation The magazine holder 210 is moved downward by the magazine shift unit 200 to set the disk D held at the lowermost tray 110 in the magazine upper section 120 onto the turntable 520. (g) Magazine retracting operation The magazine holder 210 is moved upward by the magazine shift unit 200 to conserve playback space of the disk D. (h) Floating lock-releasing operation The floating lock made by the floating lock mechanism 550 is released to place the drive base 510 in a floating state. (i) Disk playback operation The disk D on the turntable 520 is played back by the optical pickup 530. (j) Disk re-accommodating operation The magazine holder 210 is moved downward by the magazine shift unit 200 to hold the disk D on the turntable 520 by the tray 110, and then the magazine holder 210 is moved upward to release the tray 110 from the turntable 520. (k) Swing unit drawing operation The swing chassis 420 is drawn out by the swing unit 400 from the space between the magazine upper section 120 and the magazine lower section 130. (l) Magazine uniting operation The magazine holder 210 is moved downward by the magazine shift unit 200 to unite the magazine upper section 120 and the magazine lower section 130. (m) Vertical-tracking chassis moving-down operation The vertical-tracking chassis 350 is moved downward so as to be returned to the initial position. (n) Disk ejecting operation The magazine casing 100 is ejected from the magazine insertion opening 2 by the magazine eject unit 600. These operations will now be described in detail. 1. Magazine loading operation (Magazine united state) The magazine casing 100 mounted in the chassis unit 1 is in a locked state in which the division of the magazine upper section 120 and the magazine lower section 130 is restricted, as shown in FIG. 28. That is, the partition 123b constituting the uppermost slit section 123 is formed to be the longest, and the partition 132b constituting the corresponding lower slit section 132 is formed to be the shortest of other slits 123a, as shown in FIG. 7. Therefore, the uppermost slit 123b shifts toward the lower slit section 132 at the boundary of the upper slit section 123 and the lower slit section 132. Due to the above configuration, in a state before rotating the tray 110, i.e., in a state where all of the tray-supporting pawls 111 are drawn toward the lower slit section 132, only the uppermost tray-supporting pawl 111 is located over the boundary of the upper slit section 123 and the lower slit section 132, and the lower tray-supporting pawls 111 completely enter into the lower slit section 132. This allows vertical shift of the slit sections 123 and 132 to be restricted, so that the magazine upper section 120 and the magazine lower section 132 are placed in the locked state. In addition, since the terminal end of the disk hold arm 133 engages with the first groove 114 of each tray 110, and the terminal end of the tray hold arm 124 engages with the second groove 115, the rotation of the tray 110 is restricted and the locked state is maintained. The disks D are inserted into the magazine casing 100 in accordance with trays 110, and the lower surfaces of the disks D are held by the disk-supporting pawls 112a of the planetary gears 112. Since the terminal end of the disk hold arm 133 abuts against the end of each disk D, accidental popping of the disk D is prevented. The disks D are removed from the disk magazine as follows. The user urges the end sections of the disk ejection levers 125 (the right end sections in FIG. 28) toward the user's side by fingers to rotate the disk ejection levers 125 clockwise. Then, since the corresponding disk D is ejected by the end sections of the disk ejection levers 125 (the left end sections in FIG. 28) from the magazine casing 100, the user pulls out the disk D. (Initial state) First, in the initial state in which the magazine casing 100 is not inserted, the ejecting member 630 is located at the front, and the small rack 611 of the loading plate 610 is meshed with the upper gear 310a of the loading gear 310, as shown in FIG. 13. The vertical-shifting rack 321 of the rear shift plate 310 is located at the non-toothed portion of the lower gear 310c of the loading gear 310 and is not engaged therewith. (Insertion of the magazine casing 100) In this state, when the magazine casing 100 is inserted from the magazine insertion opening 2 of the chassis unit 1 in a direction in which its circular corner be the left rearward, as shown in FIG. 13, the catching section 631 of the ejecting member 630 engages with the recess 131a formed in the lower plate 131 of the magazine lower section 130. In addition, as shown in FIGS. 10 and 11, both left and right ends of the magazine upper section 120 are inserted between the magazine holder 210 and the upper gripping pawl 210b, and both left and right ends of the magazine lower section 130 are inserted between the chassis unit 1 and the lower gripping pawl 2a. (Start of loading) When the magazine casing 100 is further pressed rearward, the ejecting member 630 slides rearward to press the left end of the loading arm 620 rearward, so that the loading arm 620 is rotated clockwise. Then, the presser pawl 621 on the right end of the loading arm 620 presses the loading start switch 10 provided on the right side surface of the chassis unit 1, so that the loading motor 311 is started. Since a driving force of the loading motor 311 is transmitted to the intermediate gear 310b via the transmission gears 311a, the loading gear 310 is rotated clockwise. As described above, since the upper gear 310a engages with the small rack 611, the clockwise rotation of the loading gear 310 allows the loading plate 610 to slide leftward. Then, the recess 612a of the loading plate 610 urges the projection 622 of the loading arm 620 leftward, so that the loading arm 620 further rotates clockwise to move the ejecting member 630 rearward. Accordingly, as shown in FIG. 29, the catching section 631 engaged with the recess 131a further pulls the magazine casing 100 rearward. (Completion of loading) At the point when the ejecting member 630 reaches the rearmost end, the upper gear 310a of the loading gear 310 faces the small rack 611 of the loading plate 610 at its non-toothed portion. Thus, the loading plate 610 stops sliding, and the loading arm 620 stays at a loading completion position. When the magazine casing 100 is mounted in the chassis unit 1 as described above, an end of the tray 110 in the magazine casing 100 abuts against the tray guide surface 552b provided on the first lock plate 552 of the drive unit 500, as shown in FIG. 30. 2. Disk selecting operation (Actuation of the rear shift plate 320) When the loading gear 310 further rotates clockwise following the pulling-in operation of the magazine casing 100 as described above, the toothed portion of the lower gear 310c engages with the vertical-shifting rack 321 of the rear shift plate 320, as shown in FIG. 29. Then, since the rear shift plate 320 slides rightward, the vertical-guiding pins 351 formed on the rear of the vertical-tracking chassis 350 are urged upward by the two rear stepped cams 322 shown in FIG. 15. (Actuation of the left shift plate 340) Simultaneously, the rear end of the link plate 330 coupled to the left end of the rear shift plate 320 is urged rightward, so that the link plate 330 rotates clockwise. The left shift plate 340 coupled to the front end of the link plate 330 is urged rearward to slide. Accordingly, the vertical-guiding pin 351 formed on the left of the vertical-tracking chassis 350 is urged upward by the left stepped cam 341 of the left shift plate 340 shown in FIG. 16. (Upward movement and stop of the vertical-tracking chassis 350) Since the vertical-guiding pins 351 are urged upward as described above, the vertical-tracking chassis 350 gradually moves upward from the position of the lowermost tray 110. When the arrival of the vertical-tracking chassis 350 at a position corresponding to that of a desired tray 110 (here, the third tray 110 from above) is detected by the photodetector 15, a stop signal is transmitted to the loading motor 311 to stop the loading gear 311. Accordingly, the rear shift plate 320 is stopped, and the vertical-tracking chassis 350 is stopped. 3. Magazine unlocking operation (Initial state) In the initial state of the drive unit 360, the tray gear arm-rotating pin 367a of the tray gear 367 is in a position disengaged from the U-shaped section 365d of the operating cam groove 365c, as shown in FIG. 30. Accordingly, the tray gear arm 367 rotates clockwise, and the tray gear 366 is separated from the gear groove 116a formed in the tray 110 in the magazine casing 100. In addition, as shown in FIG. 21, since the non-toothed portion of the lower gear 365b of the cam gear 365 faces the transferring rack 411 of the power plate 410, the power plate 420 is stopped. (Upward movement of the drive unit 360) When the disk selecting operation is performed by the upward movement of the vertical-tracking chassis 350 from the initial state, the drive unit 360 is also moved upward. Then, the gear groove 116a of the desired tray 110 (here, the third tray 110 from above) and the gear grooves 116a of the higher trays 110 face the tray gear 366 without contacting each other. (Rotation of the tray 110) Next, the driving motor 361 is started to rotate the cam gear 365 counterclockwise, as shown in FIG. 32. Then, since the tray gear arm-rotating pin 367a enters the U-shaped section 365d of the operating cam groove 365c, the tray gear arm 367 rotates counterclockwise. The tray gear 366 moves forward to mesh with gear grooves 116a of the three trays 110 facing the tray gear 366. The tray gear 366 meshes with the upper gear 365a of the cam gear 365, so that the tray gear 366 rotates clockwise with the counterclockwise rotation of the cam gear 365. Therefore, the three trays 110 rotate counterclockwise simultaneously. The periphery of the trays 110 abuts against the side walls 122a (FIG. 28) and the tray guide surface 552b (FIG. 30), so that stable rotation is achieved. When the trays 110 are rotated as described above, the projections 116 each having the gear groove 116a enter the corresponding slits 212a (FIGS. 8 and 11) of the tray guide 212. (Unlocking) When the upper three trays 110 are rotated, the tray-supporting pawls 111 therearound enter the slits 123a of the upper slit section 123, as shown in FIGS. 33 and 34. At this time, the uppermost tray-supporting pawl 111 moves from the uppermost boundary of the upper slit section 123 and the lower slit section 132 to the upper slit section 123, so that there is no member for restricting the vertical shifts of the slit sections 123 and 132. Accordingly, the magazine upper section 120 and the magazine lower section 130 are placed in an unlocked state. Since the tray-supporting pawls 111 of the rotated three trays 111 are supported only by the upper slit section 123, the trays 110 are released from the magazine lower section 130 so as to be lifted together with the magazine upper section 120. (Stop of the tray gear 366) When the trays 110 are rotated by predetermined degrees as described above, the tray gear arm-rotating pin 367a is disengaged from the U-shaped section 365d of the operating cam groove 365c, as shown in FIG. 35. Accordingly, the tray gear arm 367 rotates clockwise and the tray gear 366 moves rearward, so that the tray gear 366 is separated from the gear groove 116a. At this time, the brush switch 364 shown in FIG. 19 reaches the contact w to detect the unlocking of the magazine casing 100, whereby the driving motor 361 is stopped. 4. Magazine dividing operation (Upward movement of the magazine holder 210) The magazine shift motor 221 is started to rotate the cylindrical cam 220 after unlocking the magazine casing 100 as described above. Then, as shown in FIG. 9, the left holder guide pin 211 of the magazine holder 210 is urged upward by the helical cam 220a. Simultaneously, the disk-like gear 220c of the cylindrical cam 220 rotates the second disk section 232 via the first disk section 231. Since the magazine-shifting rack 241 of the magazine shift plate 240 engages with the circular gear 232b of the second disk section 232, the magazine shift plate 240 slides rearward with the rotation of the second disk section 232. Accordingly, as shown in FIG. 12, the right holder guide pins 211 of the magazine holder 210 are urged upward by the inclined cams 242 formed in the magazine shift plate 240. When the holder guide pins 211 are urged upward as described above, the magazine holder 210 moves upward to the magazine full-open position. The position of the magazine shift plate 240 at this time is detected by the magazine open switch 14, and the magazine shift motor 221 is stopped. (Division of the magazine) By the upward movement of the magazine holder 210 as described above, the magazine upper section 120 gripped by the upper gripping pawls 210b is lifted together with the three trays 110, as shown in FIGS. 36 and 37. The magazine lower section 130, however, stays downward together with the two trays 110 because it is gripped by the lower gripping pawls 2a. Accordingly, the magazine casing 100 is divided into upper and lower sections in the chassis unit 1. At this time, the guide shaft 3 are inserted into the insertion holes 210a of the magazine holder 210, and are further inserted into the guide holes 126, so that the forward and backward movements of the magazine upper section 120 are restricted. The projections 116 of the three trays 110 enter the slits 212a of the tray guide 212. Accordingly, the trays 110 are supported by a total of four points including the three tray-supporting pawls 111, and do not hang down in a specific direction. 5. Swing unit transferring operation (Rotation of the swing chassis 420) The driving motor 361 of the drive unit 360 is restarted after the completion of division of the magazine casing 100 to rotate the cam gear 365 counterclockwise. Then, as shown in FIG. 21, the gear groove of the lower gear 365b of the cam gear 365 meshes with the transferring rack 411 of the power plate 410, so that the power plate 410 slides leftward. Since the power roller 412 engages with the hook-like cutout 422 of the swing chassis 420, the swing chassis 420 is urged by the power roller 412 moving leftward together with the power plate 410, and starts to rotate counterclockwise about the transfer-rotation shaft 421. When the swing chassis 420 is continuously rotated, the overall swing unit 400 is transferred into the space between the divided magazine upper section 120 and the magazine lower section 130, as shown in FIG. 38. The abutting pawl 424 formed at the terminal end of the swing chassis 420 engages with the V-shaped slit 6 of the chassis unit 1 (see FIG. 22), so that the rotation of the swing chassis 420 is stopped. (Holding of the swing chassis 420) As shown in FIG. 38, the hold arm 431 biased by the helical extension spring 431b rotates clockwise in synchronism with the rotation of the swing chassis 420. When the rotation of the swing chassis 420 is stopped, the holding projection 423 of the swing chassis 420 engages with the holding hole 431a formed in the terminal end of the hold arm 431. As shown in FIG. 39, the tray guide projection 512 on the drive base 510 abuts against ends of the three trays 110 accommodated in the magazine upper section 120. Furthermore, as shown in FIG. 38, the power plate 410 slides leftward, and the power roller 410 is disengaged from the hook-like cutout 422 even after the rotation of the swing chassis 420 has been stopped. The leftward slide of the power plate 410 allows the hold link pin 432a of the hold link 432 to enter the right-hand front horizontal section 413b of the holding cam 413. Then, the hold link 432 rotates counterclockwise, so that the hold plate 433 is urged to slide forward. The hold arm 431 rotates clockwise to press an end of the swing chassis 420 as described above. The presser section 433a of the hold plate 433, however, presses the rear end of the holding arm 431. Accordingly, counterclockwise return of the hold arm 431 is restricted and the swing chassis 420 is held more firmly, so that rattling of the swing chassis 420 is prevented. At this time, the brush switch 364 shown in FIG. 19 reaches the contact x to detect the completion of transferring, whereby the driving motor 361 is stopped. 6. Disk chucking operation The drive unit 500 formed on the swing unit 400 that has been transferred as described above is in a floating locked state, and the turntable 520 reaches a position corresponding to the center hole of the disk D, as shown in FIG. 39. In this state, when the magazine shift motor 221 is started to move the magazine holder 210 to the disk chucking position, as shown in FIG. 40, the position of the magazine shift plate 240 at this time is detected by the chucking switch 13, and the magazine shift motor 221 is stopped. When the magazine holder 210 moves downward to the intermediate position as described above, the magazine upper section 120 held by the magazine holder 210 also moves downward. Then, the disk D held in the third tray 110 in the magazine upper section 120 is pressed onto the turntable 520, and the disk insertion section 524 is inserted into the center hole of the disk D. At this time, as shown in FIGS. 24B and 24C, the disk hook 525 provided on the disk insertion section 524 rotates inward about the fulcrum 525b against the biasing force of the spring 523, so that the hooking section 525a is inserted into the center hole of the disk D. When the hooking section 525a passes through the center hole, the disk hook 525 is rotated outward by the biasing force of the spring 523 and the hooking section 525a engages with the upper end of the center hole of the disk D, so that the disk D is held on the turntable 520. At this time, as shown in FIG. 41, only the third tray 110 faces the tray gear 366. 7. Disk releasing operation (Rotation of the tray 110) After the completion of disk chucking, the driving motor 361 is restarted to rotate the cam gear 365 counterclockwise. Then, as shown in FIG. 39, the tray gear arm-rotating pin 367a enters the U-shaped section 365d of the operating cam groove 365c of the upper gear 365a, so that the tray gear arm 367 rotates counterclockwise. This allows the tray gear 366 to move forward so as to mesh with the gear groove 116a of the third tray 110 again. The tray gear 366 is rotated clockwise by the mesh with the upper gear 365a, the tray 110 further rotates counterclockwise. The periphery of the tray 110 abuts against the side wall 122a of the magazine upper section 120 and the tray guide projection 512 of the drive base 510, so that stable rotation can be achieved. (Release of the disk D) When the third tray 110 rotates counterclockwise as described above, the planetary gears 112 on both ends of the tray 110 engage with the gear grooves 123c of the upper slit section 123, as shown in FIG. 39, so that the planetary gears 112 rotate clockwise. The disk supporting pawls 112a of the planetary gears 112 supporting the disk D retract outside the disk D. Accordingly, the periphery of the disk D chucked on the turntable 520 is released. At this time, the non-toothed portion of the lower gear 365b of the cam gear 365 faces the transferring rack 411 of the power plate 410, so that the power plate 410 is stopped. (Retraction of the tray gear 366) Furthermore, the counterclockwise rotation of the cam gear 365 allows the tray gear arm-rotating pin 367a to be disengaged from the U-shaped section 365d of the operating cam groove 365c, as shown in FIG. 42, so that the tray gear arm 367 rotates clockwise. Then, the tray gear 366 moves rearward to be separated from the gear groove 116a of the tray 110. At this time; the brush switch 364 reaches the contact y to detect the disk release position, whereby the driving motor 361 is stopped. 8. Magazine retracting operation When the magazine shift motor 221 is started after the disk D has been released as described above to move the magazine holder 210 upward to the magazine full-open position, the position of the magazine shift plate 240 at this time is detected by the magazine open switch 14, and the magazine shift motor 221 is stopped. When the magazine holder 210 moves upward to the magazine full-open position again, the magazine upper section 120 held by the magazine holder 210 also moves upward. Accordingly, three trays 110 in the magazine upper section 120 are lifted except one disk D chucked on the turntable 520, whereby a clearance required for the playback of the disk D is conserved. 9. Floating lock releasing operation When the driving motor 361 is started to rotate the cam gear 365 counterclockwise after the completion of the magazine retracting operation, the gear portion of the lower gear 365b engages with the transferring rack 411 of the power plate 410, so that the power plate 410 slides leftward. Then, as shown in FIG. 25, the power roller 412 of the power plate 410 abuts against the rear right end of the lock link 551, so that the lock link 551 is rotated counterclockwise. Since the front end of the lock link 551 urges the first lock plate 552, the first lock plate 552 slides rightward against the biasing force of the helical extension spring 555. Accordingly, the conical projections 510a formed on the right side surface of the drive base are released from the locking holes 552a formed in the right vertical surface of the first lock plate 552. The rear end of the reverse link 554 is urged rightward simultaneously with the rightward movement of the first lock plate 552, so that the reverse link 554 is rotated clockwise. Since the reverse link 554 engages with the concave cutout 553b of the second lock plate 553 at its front end, the second lock plate 553 slides leftward against the biasing force of the helical extension spring 555. Accordingly, the conical projection 510a formed on the left side surface of the drive base 510 is released from the locking hole 553a formed in the left vertical surface of the second lock plate 553. As a result, the drive base 510 is placed in a floating state in which the drive base 510 is supported only by three dampers 511. At this time, the brush switch 354 shown in FIG. 19 reaches the contact z to detect the release of the floating lock, whereby the driving motor 361 is stopped. 10. Disk playback operation After placing the drive base 510 in the floating state as described above, the spindle motor 521 is started to rotate the disk D on the turntable 520. The feed motor 543 is started to rotate the feed screw 542, and the optical pickup 530 is moved along the guide rail 541, whereby the information of the disk D is read and played back. Since the drive base 510 is in the floating state supported only by the dampers 511, external vibrations are absorbed by the dampers 511, and the turntable 520 and the optical pickup 530 are not affected by the vibrations, so that information of the disk D can be read accurately. 11. Disk re-accommodating operation An operation for re-accommodating the playback-completed disk D in the tray 110 of the magazine casing 100 will now be described. (Floating re-locking operation) When the driving motor 361 is started to rotate the cam gear 365 clockwise after stopping the rotation of the turntable 520, the power plate 410 is slid rightward by the lower gear 365b engaged with the transferring rack 411. Then, as shown in FIG. 25, the power roller 412 of the power plate 410 moves rightward, so that the lock link 551 is released from pressing by the power roller 412. The first lock plate 552 is slid leftward by the biasing force of the helical extension spring 555. Accordingly, as shown in FIG. 26A, the conical projections 510a formed on the right surface of the drive base 510 are locked by the locking holes 552a formed in the right vertical surface of the first lock plate 552. Simultaneously, since the rear end of the reverse link 554 is biased leftward, the reverse link 554 rotates counterclockwise. Then, the biasing force of the front end of the reverse link 554 and the biasing force of the helical extension coil 555 are exerted, so that the second lock plate 553 is slid rightward. Accordingly, as shown in FIG. 26B, the conical projection 510a formed on the left surface of the drive base 510 is locked by the locking hole 553a formed in the left vertical surface of the second lock plate 553. (Disk re-gripping operation) When the magazine shift motor 221 is started to move the magazine holder 210 downward to the disk chucking position in a state where the drive base 510 is floating locked to restrict displacement thereof, the position of the magazine shift plate 240 at this time is detected by the chucking switch 13, and the magazine shift motor 221 is stopped. When the magazine holder 210 moves downward to the disk chucking position again as described above, the third tray 110 in the magazine upper section 120 comes into contact with the disk D on the turntable 520. When the driving motor 361 is continuously driven to rotate the cam gear 365 clockwise, the tray gear arm-rotating pin 367a enters the U-shaped section 365d of the operating cam groove 365c, so that the tray gear ram 367 rotates counterclockwise. This allows the tray gear 366 to move forward to mesh with the gear groove 116a of the third tray 110. The tray gear 366 meshes with the upper gear 365a to rotate counterclockwise, thereby rotating the three trays 110 clockwise. Since the periphery of the trays 110 abuts against the side wall 122a and the tray-guide projection 512, the stable rotation of the trays 110 is achieved. When the tray 110 rotates clockwise as described above, the planetary gears 112 rotate counterclockwise because they engage with the gear grooves 123c of the upper slit section 123, as shown in FIG. 34. Then, the disk supporting pawls 112a get under the disk D to support the disk D. Accordingly, the periphery of the disk D chucked on the turntable 520 is held. At this time, since the non-toothed portion of the lower gear 365b faces the transferring rack 411, the power plate 410 is stopped. When the cam gear 365 further rotates clockwise, the tray gear arm-rotating pin 367a is disengaged from the U-shaped section 365d of the operating cam groove 365c, so that the tray gear arm 367a rotates clockwise. Then, the tray gear 366 moves rearward to be separated from the gear groove 116a of the third tray 110. (Disk chucking releasing operation) When the magazine shift motor 221 is started to move the magazine holder upward to the magazine full-open position under the above-described state, the position of the magazine shift plate 240 at this time is detected by the magazine open switch 14, and the magazine shift motor 221 is stopped. When the magazine holder 210 moves upward to the magazine full-open position as described above, the magazine upper section 120 held by the magazine holder 210 also moves upward. Accordingly, the disk D held by the tray-supporting pawl 111 of the third tray 110 falls out of the disk insertion section 524 at its center hole, and moves upward together with the magazine upper section 120. 12. Swing unit drawing operation When the cam gear rotates clockwise after releasing the chucking of the disk D, the gear groove of the lower gear 365b meshes with the transferring rack 411, so that the power plate 420 slides rightward. Then, the power roller 421 re-engages with the hook-like cutout 422 of the swing chassis 420 so as to be biased rightward, so that the swing chassis 420 start to rotate clockwise about the transfer-rotation shaft 421. When the swing chassis 420 continues to rotate, the overall swing unit 400 is drawn out of the space between the magazine upper section 120 and the magazine lower section 130 to return to the initial position of the left rearward of the chassis unit 1, as shown in FIG. 21. Simultaneously, the hold link pin 432a of the hold link 432 enters the rear horizontal section 413a on the left of the holding cam 413. Then, the hold link 432 rotates clockwise, so that the hold plate 433 is biased to slide rearward. Since the front end of the hold plate 433 is disengaged from the hold arm 431 pressing an end of the swing chassis 420, the hold arm 431 gradually rotates counterclockwise together with the clockwise rotating swing unit 400 against the biasing force of the helical extension spring 431b, and finally returns to the position to contact the left end portion of the chassis unit 1. 13. Magazine uniting operation (Downward movement of the magazine holder 210) When the magazine shift motor 221 is started to move the magazine holder 210 downward to the magazine insertion-ejection position after the swing unit 400 has been drawn out as described above, the position of the magazine shift plate 240 is detected by the magazine close switch 12, and the magazine shift motor 221 is stopped. The magazine upper section 120 gripped by the magazine holder 210 moves downward together with the three trays 110 to be united with the magazine lower section 130 that has been stayed downward together with the two trays 110. At this time, since the guide shafts 3 are inserted into the insertion holes 210a of the magazine holder 210, the forward and backward movement of the magazine upper section 120 is restricted and the magazine upper and lower sections 120 and 130 are united accurately. (Magazine locking operation) When the cam gear 365 further rotates clockwise, the tray gear arm-rotating pin 367a enters the U-shaped section 365d of the operating cam groove 365c, so that the tray gear arm 367 rotates counterclockwise. Then, the tray gear 366 moves forward to mesh with the gear grooves 116a of the three trays 110 that facing the tray gear 366. The tray gear 366 is rotated counterclockwise by the clockwise rotation of the cam gear 365, whereby the three trays 110 rotate clockwise. Since the periphery of the trays 110 abuts against the side wall 122a of the magazine upper section 120 and the tray guide surface 552b of the drive unit 550, so that stable rotation can be achieved. When the trays 110 rotate as described above, the tray-supporting pawls 111 enter the slits 132a of the lower slit section 132, as shown in FIG. 28. At this time, as shown in FIG. 7, only the uppermost tray-supporting pawl 111 is located over the boundaty of the upper slit section 123 and the lower slit section 132, and the lower tray-supporting pawls 111 completely enters into the lower slit section 132. Accordingly, the magazine upper section 120 and the magazine lower section 130 are placed in the locked state. When the cam gear 365 continuously rotates clockwise after the magazine casing 100 has been placed in the locked state, the tray gear arm-rotating pin 367a is disengaged from the U-shaped section 365d of the operating cam groove 365c, so that the tray gear arm 367 rotates clockwise. Then, the tray gear 366 moves rearward to be separated from the three trays 110 facing the tray gear 366. At this time, the brush switch 364 shown in FIG. 19 reaches the contact v to detect the standby state, whereby the driving motor 361 is stopped. 14. Vertical-tracking chassis moving-down operation The loading motor 311 is started to rotate the loading gear 310 counterclockwise after the completion of uniting and locking of the magazine casing 100. Then, the toothed portion of the lower gear 310c engages with the vertical-shifting rack 321 of the rear shift plate 320. Since the rear shift plate 320 slides leftward, the vertical-guiding pin 351 of the vertical-tracking chassis 350 is urged downward by the rear stepped cams 322. Simultaneously, the link plate 330 coupled to the left end of the rear shift plate 320 rotates counterclockwise, and the left shift plate 340 coupled to the front end of the link plate 330 slides forward. Accordingly, the vertical-guiding pin 351 is urged downward by the left stepped cam 341 of the left shift plate 340. Since the vertical-guiding pins 351 are urged downward as described above, the vertical-tracking chassis 350 moves downward to return to the initial lowermost position. The lower gear 310c of the loading gear 310 faces the vertical-shifting rack 321 at its non-toothed portion, so that the rear shift plate 320 is stopped. 15. Magazine ejecting operation When the loading gear 310 continuously rotates counterclockwise, the upper gear 310a engages with the small rack 611 of the loading plate 610, as shown in FIG. 13, so that the loading plate 610 slides rightward. Then, the recess 612a of the loading plate 610 biases the projection 622 of the loading arm 620, so that loading arm 620 rotates counterclockwise to move the ejecting member 630 forward. Since the catching section 631 of the ejecting member 630 engages with the recess 131a of the magazine lower section 130, the magazine casing 100 is ejected with the forward movement of the ejecting member 630. When the magazine casing 100 is ejected from the magazine insertion opening 2 by a predetermined amount, the presser pawl 621 formed on the right end of the loading arm 620 presses the eject end switch 11 of the chassis unit 1, so that the loading motor 311 is stopped, and the loading arm 620 stays at the ejecting completion position. In this state, the user pulls the magazine casing 100 out of the magazine insertion opening 2. (3) Effects The embodiment described above offers the following advantageous effects. That is, since the magazine casing 100 can be locked and the trays 110 can be held by the upper and lower slit sections 123 and 132, and by the tray-supporting pawls 111 that move in accordance with the rotation of the trays 110, only the drive unit 360 for rotating the trays 110 and the vertical-tracking unit 300 may be provided in order to realize these functions. Accordingly, locking and unlocking of the magazine casing 100, selection of the disk, and supporting of the trays 110 can be effected by a simple mechanism, and the size and cost of the disk apparatus can be reduced. In particular, since the trays 110 are rotated by rotating the tray gear 366 that is engaged with and disengaged from the gears grooves 123c of the trays 110, a positive operation can be realized by a simple mechanism. In a state where the swing unit 400 is not transferred, ends of the trays 110 in the magazine casing 100 abuts against the tray guide Surface 552a of the first lock plate 552, so that a stable rotation of the trays 110 when locking and unlocking the magazine casing 100 is achieved, and reliability is improved. When lifting the magazine upper section 120, the projections 116 of the trays 110 enter the slit 212a of the tray guide 212, so that the periphery of the trays 110 are supported by a total of four points including the three tray-supporting pawls 111 and do not hang down in a specific direction. In a state where the swing unit 400 is transferred, the ends of the trays 110 in the magazine upper section 120 abut against the tray guide projection 512 of the drive base 510, so that stable rotation of the trays 110 when releasing or holding the disk D is achieved, and reliability is improved. Since the disk D is held by the disk-supporting pawls 112a of the planetary gears 112, the disk D can be held and released by a simple mechanism. Since the terminal end of the tray hold arm 124 engages with the first groove 114 of the tray 110, the rotation of the tray 110 is restricted, the rotation and unlocking of the tray 110 during transport can be prevented. In particular, both slit sections 123 and 132 are provided at three sections around the tray 110, the tray 110 can be positively locked. Since the terminal end of the disk hold arm 133 engages with the second groove 115 of the tray 110 to abut against the disk D mounted on the tray 110, so that accidental popping of the disk D is prevented. When the magazine upper section 120 is lifted together with the magazine holder 210, the guide shafts 3 are inserted into the guide holes 126 to guide the lifting. Therefore, the magazine upper section 120 causes no positional deviation, and operation failure caused when dividing and uniting the magazine upper and lower sections 120 and 130 is prevented. The cylindrical cam 220 is relatively small in its depth and width dimensions, thereby allowing easily a reduction in size of the overall apparatus. In particular, the cylindrical cam 220 is used on the side of the swing unit 400 where the depth stroke is hardly conserved, and the magazine shift plate 240 that is small in its depth dimension is used on the opposite side of the swing unit 400 where the depth stroke is easily conserved, thereby allowing the members to be arranged with a space efficiency, and a substantial reduction in size of the overall apparatus can be achieved. When the swing chassis 420 is transferred, its abutting pawl 424 is held by the V-shaped slit 6, and the opposite side thereof is held by the hold arm 431. Thus, the swing chassis 420 is supported by the transfer-rotation shaft 425a, the V-shaped slit 6, and the hold arm 431, and is hardly affected by vibrations. Furthermore, since the presser section 433a of the hold plate 433 presses the rear end of the hold arm 431, the return of the hold arm 431 is prevented, and the swing chassis 420 is held more firmly. The disk D can be easily chucked onto and released from the turntable 520 by lifting the magazine holder 210 to allow the disk hook 525 to be engaged with and disengaged from the center hole of the disk D, so that a special member for holding the disk D from above is not required and the configuration of the apparatus can be simplified. Modifications The present invention is not limited to the embodiments described above, and factors such as the number, shape, size, and so forth of each member may be changed as necessary. For example, any number of the trays 110 may be provided in the magazine casing 100 as long as the plural number. Accordingly, the number of the slits 123a, 132a, and 212 may be changed. In addition, any of the trays 110 other than the third tray 110 may be selected by lifting the vertical-tracking unit 300. It is possible that the magazine casing 100 is divided by moving upward and downward the magazine lower section 130, and the disk D is chucked on the downward-facing turntable 520 to perform disk playback operation. In addition, any disk-like recording medium may be employed in the present invention. The present invention may be applied not only to playback apparatuses but also to apparatuses capable of recording and playback. As will be understood from the foregoing description, the present invention provides a compact disk apparatus that can save space for dampers without damaging the vibration-reducing capability. Still further, the present invention provides a disk apparatus that can more firmly hold a swing unit provided with a disk playback section, and that is resistant to vibrations during playing back of the disk.

Claims: A disk apparatus comprising: a disk magazine (100) having a plurality of trays (110), each tray (110) having mounted therein a disk (D), said disk magazine (100) divided into upper and lower sections (120, 130); a chassis unit (1) for mounting therein said disk magazine (100); a magazine dividing section for dividing and uniting said disk magazine (100) mounted in said chassis unit (1); a disk selecting section for selecting a desired disk (D); a swing unit (400) transferred into a space between the divided upper and lower sections (120, 130) of said disk magazine (100); and a disk playback section (520, 530) provided on said swing unit (400) for playing back the disk (D) selected by said disk selecting section; wherein said chassis unit (1) is provided with a holding section (6) for holding the terminal end (424) of said transferred swing unit (400), characterized by further comprising a hold arm (431) for holding an end of said swing unit (400) opposite to said terminal end (424) held by said holding section (6) when said swing unit (400) is transferred. The disk apparatus according to claim 1, further comprising a hold plate (433) for pressing said hold arm (431) in the direction to hold said swing unit (400) when said swing unit (400) is transferred.

Inventors: TAKAI KAZUKI, TAKAI, KAZUKI, Takai, Kazuki c/o Clarion Co., Ltd.
Applicants: CLARION CO LTD, CLARION CO., LTD.
Application year: 1999
Main classification: G11B17
IPC codes: G11B17