Source: http://www.google.com/patents/US4539663?dq=6008737
Timestamp: 2016-07-29 12:58:08
Document Index: 706449502

Matched Legal Cases: ['Application No. 56', 'application No. 57', 'art 32', 'art 32', 'art 32', 'art 32', 'art 32', 'art 13', 'art 32', 'art 32', 'art 32']

Patent US4539663 - Disc playing system with continuous playing function - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn automatic disc playing system for playing selected ones of a plurality of discs stored therein in succession, includes a disc storing part for holding the discs, having a plurality of slots juxtaposed in a predetermined direction, a detection means for detecting the presence or absence of a disc in...http://www.google.com/patents/US4539663?utm_source=gb-gplus-sharePatent US4539663 - Disc playing system with continuous playing functionAdvanced Patent SearchPublication numberUS4539663 APublication typeGrantApplication numberUS 06/639,471Publication dateSep 3, 1985Filing dateAug 10, 1984Priority dateAug 12, 1983Fee statusPaidPublication number06639471, 639471, US 4539663 A, US 4539663A, US-A-4539663, US4539663 A, US4539663AInventorsMasaya Ishibashi, Atuki Tada, Jun KandaOriginal AssigneePioneer Electronic CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (35), Classifications (16), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetDisc playing system with continuous playing function
US 4539663 AAbstract
An automatic disc playing system for playing selected ones of a plurality of discs stored therein in succession, includes a disc storing part for holding the discs, having a plurality of slots juxtaposed in a predetermined direction, a detection means for detecting the presence or absence of a disc in each of the slot, and a memory means for memorizing the number of vacant slots in accordance with the output signal of the detection means. The detection means is made up of a plurality of members provided to each of the slots, to be shifted when a disc is put in the slot, and a sensor means to be moved along the direction of the arrangement of the slots for detecting the position of each of the members provided to the slots.
1. A disc playing system for playing selected ones of a plurality of stored discs in succession, comprising:disc storing part having a plurality of slots for receiving a disc which are juxtaposed in a predetermined direction with a predetermined pitch, where a sequential number is assigned to each of said slots; a detection means for detecting whether or not a disc is present in each of said slots; and a memory means for memorizing the number of vacant slots in accordance with an output signal from said detection means, wherein said detection means includes a plurality of members movably provided in each of said slots and to be shifted when a disc is put in the slot, and a sensor means movably disposed along said direction of arrangement of slots for in turn detecting the position of each of said members. Description
The present invention relates to a disc playing system, and more particularly to a disc playing system which stores a plurality of discs and capable of continuous playing of discs in order which discs are arbitrarily selected from the stored discs.
As an example of the disc playing system of this type, a disc displaying system is described in Japanese Patent Application No. 56-67396corresponding to U.S. patent application Ser. No. 373,123 filed May 2, 1982. In this disc playing system, a plurality of discs are stored in a disc storing part and juxtaposed at a predetermined space. A disc playing means is provided to be slidable along the direction of the arrangement of the discs, and a detection means is provided for detecting the position of the disc playing means relative to each storing slot of the disc storing part. The disc playing means is translated along the direction of the disc arrangement and stop position is controlled in accordance with the output signal of the light sensor so that the disc playing means stops at the position of a selected disc. The playing of the selected disc is parformed after the disc is moved from the disc storing part to the playing position by means of a disc transportation means.
A disc presence or absence sensor is provided in the middle of the route of the movement of the disc from the disc storing part to the playing position and the detection of the presence or absence of a disc in a selected disc storing slot is performed in such a manner as to detect whether or not the passing of a disc is sensed within a predetermined time period after the start of the operation of the disc transportation means. If it is detected that no disc is present in the selected disc storing slot, then the number of the slot is memorized in the memory means. Thus, further designation of the disc storing slot having no disc is prevented and as a result the discs are played in sequence very smoothly.
Since this conventional disc playing system is constructed in this manner, there is an advantage that the disc storing slot with no disc is no selected twice. However, at the time of first selection of such a disc storing slot, the playing means is moved to the position of the selected slot and the disc translation means is actuated until the absence of the disc is sensed. Thus, there is a drawback that the electricl engergy is consumed by the movement of the playing means and the disc transportation means and also a time period is consumed by the above process.
Further, in the case of the disc playing system of Japanese Patent application No. 57-45276 proposed by the present applicant, a scaning is effected through all of the disc storing slots at the time of throw-in of the power current and the numbers of the vacant disc storing slot are memorized. However, also in this type of disc playing system, there is the same problem that the disc transportation means is moved to the position of each disc storing slot and the output signal of the disc presence sensor is observed each time. Thus a long time period is required before the selection of the disc becomes possible after the throw-in of the power current.
A objec of the invention is therefore to provide a disc playing system which is capable of detecting the vacant disc storing slot at a very high speed.
According to the present invention, the detection means for detecting the presence of a disc in each disc storing slot of the disc storing part is made up of displacement members provided to each of the disc storing slots and adapted to shift when a disc is stored in the slot, and a sensor means movable along the direction of the arrangment of discs and adapted to detect the shift of the displacement member in order.
FIGS. 5A and 5B are reapectively a partially cross-sectional front view and a cross sectional side view of the disc storing part;
FIGS. 5C and 5D are respectively a perspective view of a displacement member provided in the disc storing part, and a cross-section taken along the line A--A of FIG. 5A;
FIGS. 6b and 7B are side views of the disc stopper respectively corresponding to FIGS. 5A and 6A;
FIGS. 15A and 15B are respectively a plan view and a front view showing the relative position of each part during a period for the detection of the presence or absence of the disc and the detection of the disc side;
FIG. 16 is a diagram showing the relation between the positions of the disc in the disc storing part and in the playing position; and
FIGS. 17A and 17B are waveform diagrams showing the output signals of the slot position sensor and the disc presence sensor produced when the carrer is moved along the disc storing part.
FIG. 1 is a perspective view of the disc player system of the invention in which the general structure of player system is illustrated. In FIG. 1, the player system includes a housing of a main unit 4 in which a plurality of discs 2 are housed and the discs are played automatically. The housing has a construction suited for stacking with other appliances such as an amplifier and a tuner of similar size. A disc entrance port 3 is formed, for example, in the front face of the housing. A disc holder (to be explained later) is provided near to the disc entrance port 3 so that the discs are loaded and removed with ease. A door 5 for closing the disc entrance port 3 is connected to the housing. The opening and closing of the door is performed by means of a door switch 6 mounted in the front face of the housing. Also, there is provided a control unit 6 which transmits various commands to the main unit 4 and connected to the main unit 1 via a wire or wireless connection means.
FIGS. 2A through 2C show the construction of the control unit 6, in which FIG. 2A is a plan view, FIG. 2B is a partially sectional front view, and FIG. 2C is a side view respectively. The control unit 6 has a plurality of operation keys thereon. The keys comprise number keys 7 to which the numbers 0 through 9 are alloted for the designation of the number of disc and the number of music to be selected, an ENT key 8 for registering the selected number in a memory means, an ALL key 9 for the selection between a play mode for playing the discs in order from a first disc and a play mode for playing all of the designated discs, a START key 10 for starting the play after completion of the designation in the memory means, a NEXT key for commanding the shift to the next disc/music registered in the next position in the memory means while a disc/music registered in the memory means is being played, and an AGAIN key 12 for commanding the replay of the music in accordance with the contents registered in the memory means. Further the control unit 6 has a plurality of index plates 13 on which the title or the program can be entered and altered in connection with the replacement of the discs, and operatable as a memory means which is easy to look up, a plurality of index switches 14 for picking out one of index plates 13 being searched for, with the index switch 14 interlocked with the index plates 13, and prepared as many as the number of index plates 13, and a plurality of index keys 15 from number 1 through number 5 for designating the disc number separately from the number keys 7. As mentioned above, the title or the program name on the index plates 13 can be altered easily in relation to the replacement of the discs.
FIGS. 3A through 3C show the construction of the disc player system, where FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view. Before explaining the internal construction, the peripheral portion of the door 5 previously mentioned is covered by paint for example. Further, the door is provided with a pair of support pins 23a, 23b fixed to the under base 22 and a pair of bearings 24a, 24b respectively engageable with the support pins 23a, 23b. A sectoral gear 25 is connected to one, for example the bearing 24a of the bearings 24a and 24b. A drive motor 26 and a reduction gear 27 for opening and closing the door 5 are provided and secured on the under base 22. A gear 28 of the final stage of the reduction gear 27 is meshed with the sectoral gear 25. A cam 30 having a recess 30a on the outer surface is fixed on a shaft 28 of the gear 28 of the final stage. A pair of limit switches 31a and 31b each having a cam follower are provided and abut against the outer surface of the cam 30 so as to detect an open limit and a close limit of the door 5 when the cam follower is received in the recess 30a.
In the disc storing part 32, each of the discs 2 is held in a slot formed between two adjacent partition plates 35. As shown in FIGS. 5A and 5B, each slot is provided with a displacement member 38 which is desinged to shift when a disc is put in the slot. The displacement member 38 has, as clearly shown in FIG. 5C, a bearing head 38a with a concave upper face, a shutter plate 38b and a connecting rod 38c for connecting the bearing head 38a and the shutter plate 38c, and supported by the support base 34 at the connecting rod 38c thereof so as to move freely in the vertical direction. Further a spring is provided between the bearing head 38a and the support base so as to urge the displacement member 38 upwardly. Thus, when the disc is not present in the slot, the lower end of the shutter plate 38b of the displacement member 38 is located almost on the level of an upper reference line A. When the disc is present, the displacement member 38 is moved down against the resilient force of the spring 39 by the weight of the disc and in this state an upper edge of e shutter plate 38c is almost on the level of the upper reference line A and the lower edge of the shutter plate 38c is almost on the level of a lower reference line B.
On the other hand, a holder 51 which carries a slot position sensor 50a and a disc presence sensor 50b thereon is fixed to the carrier 40 via a connection member 52 so as to move in the direction of the arrangement of the discs together as the movement of the carrier 40 which is shown in FIG. 3. The slot position sensor 50a is mounted on the holder 51 at the level of the upper reference line A so as to detect the position of each slot when moved along the line A as the movement of the carrier 40. Similarly, the disc presence sensor 50b is mounted on the holder 51 at the level of the lower reference line B so as to detect the postion of the displacement member 38 i.e., the presence or absence of the disc in the slot when moved along the line B. The slot position sensor 50a and the disc presence sensor 50b are spaced on the holder 51 at a distance 1 which is substantially equal to the space of the disc in the disc storing part 32.
As shown in FIG. 5D the slot position sensor 50a and the disc presence sensor 50b are respectively made up of a light emitting element and a light receiving element which are faced with each other so as to form a gap therebetween in which the shutter plate 38c is located. Since the output signal of the sensor 50a is in the form of a pulse train each of the pulse thereof corresponds to the position of the slot, the postion of the carrier 40 relative to the position of the slots can be detected, for example, by counting the trailing edge of each pulse.
A mechanism base 53 is fixed on the carrier 40 and which carries thereon various parts such as a disc drive motor 54 for rotating the disc, a pickup 55 for the readout of disc information movably supported on the mechanism base 53, a pickup drive motor 56 and a reduction gear 57 for moving the pickup, a slider 58 for drawing out a disc stroed in the disc storing part 32, a guide base 59 for guiding and supporting the slider 58. Further, as a means for playing the disc, a carrier assembly 64 is made up of a pair of guide plates 60a, 60b for guiding the disc drawn out from the disc storing part 32 to the playing position, a disc side sensor 61 fixed on one of the guide plates 60a, 60b for detecting the side of the disc, and a clamp arm on which a clamper 62 for holding the disc is mounted.
Two bit signals are used and applied to the drive circuit 406 for the control of the forward roatation, the backward rotation, and the stoppage of each motors. As an example, combinations (00), (01), and (10) may be used respectively as the representation of the stoppage, the forward rotation, and the backward rotation. In addition, for the purpose of speed control, one bit indicative of a high speed and a low speed of rotation can be added to the above combination. In that case, combinations (000), (001), (010), (101), and (110) may respectively represent the stoppage, the forward rotation at the low speed, the backward rotation at the low speed, the forward rotation at the high speed, and the backward rotation of the high speed. Further, it is possible to use a multi bit digital signal and a speed control means having a D/A (digital to analog) converter acceptable the multi bit digital signal.
With the thus constructed control part, the reset signal is produced at the time of throw-in of the power current irrespective of the operation of the door open/close limit switches 31a, 31b, or the position of the carrier, and the T flip flop 111 is set such that the Q=L, Q =H. Therefore, the door motor drive motor 26 is rotated reversely or in the backward direction to close the door, until the L level signal is produced by the close limit switch 31b. The output signal of the door switch 1 which is produced when operated, is effective only when the switch 49a produces the L level signal (indicating that the carrier 40 is in the home position), and the output signal state of the T flip flop 111 is inverted in that state, to drive the door drive motor 26 in the forward direction until the L level signal is produced by the door open limit switch 31a (indicating that the door is closed) or to drive the door drive motor 26 in the backward direction until the L level signal is produced by the door close limit switch 31b (indicating that the door is fully open). As will be appreciated from the foregoing, the door control unit is constructed to allow the opening of the door only when the carrer which carries the playing system is in the home position. Therefore, it is quite advantageous for preventing such an inconvenience that a new disc is inserted in the storing position of the disc being loaded in the playing position.
The operation of the disc player system having the above explained construction will be further explained. As for the setting or the storing of discs, the operation is simplified because the door 5 is opened automatically when the door switch 1 is operated, and the disc storing part 32 located behind the door 5 becomes readily accessible. To set a disc, the system simply requires to place the disc in any of the spaces formed between each adjacent partition plates 35. In this state, since the disc stopper 71 is positioned in the stop position by the engagement with the cam plate 73 of the carrier 40 (as shown in FIG. 6), the inserted disc is prevented from being droping off backward and surely set in the disc storing position. In addition, the searching of the desirable disc or program will be facilitated by entering the title of the disc in the corresponding index plate provided in the control unit 6 and the program names in the MEMO part 13b thereof. When the storing of the disc are completed, and the door switch 1 is pressed once more, the door 5 is closed automatically to cause the closure of the door close limit switch 31b. In response to the output signal of the door close limit switch 31b,the slot position sensor 50a and the disc presence sensor 50b interlocked with the carrer 40 are started to move for the detection of the presence of the disc in each disc storing slot of the disc storing part 32.
Assuming that the fourth disc storing slot is vacant, the detection takes place in the following manner. Firstly, the carrier 40 is moved in the direction that the number of the disc increases. In this state, according to the position of each displacement member 38 provided per slot, the output signals of the slot position sensor 50a and the disc presence sensor 50b vary as illustrated in the waveform diagrams of FIGS. 17A and 17B. Since the position of the sensors are spaced almost by the amount equal to the pitch of the arrangement of the discs, the output signal fo the disc presence sensor 50b is produced with a delay of the time corresponding to one disc relative to the output signal of the slot position sensor 50a. Althrough the output signal of the disc presence sensor 50b is synchronized with the output signal of the slot postion sensor 50a, the signal shows no change on the position of the vacant slot. Therefore, the presence or absence of the disc the in each disc storing slot is detected by reading the output pulse train of the disc presence sensor 50b in synchronization with the trailing edge of the output pulse train of the slot postion sensor 50a. The number of the thus detected slot is then memorized in the memory part of the RAM 402 (FIG. 10) and will be reviewed at the time of the selection of discs. When the detection of the presence of the disc in each of the disc storing slots is completed, then the carrier is returned to the home position and the selection of music is permitted afterwards. Further, the system may be constructed so that the detection of the presence of the disc is started in response to the throw-in of the power current, and also it is possible to provide a command switch for starting the disc presence detection operation so that the detection is started in response to the operation of this command switch.
In response to a start command entered by the START key 10, the carrier assembly 64 is moved to the position of the selected disc. In this state, the cam pin 74 securely fixed on the stopper arm 72 of the disc stopper 71 is graduarry disengaged from the cam plate 73 of the carrier 40 as the carrier assembly 64 moves. As the result, disc stopper 71 for preventing the backward movement of the stored discs is rotated in the counter clockwise direction from the position illustrated in FIG. 6B to the siding position in which the disc can be drawn to the playing position without contacting with the disc stopper 71 as illustrated in FIG. 7. As the carrier assembly 40 moves, the number displayed on the DISC indicator 16 increases by one and stops a the number corresponding to the selected disc, and the ACCESS indicator 20 is turned off during this period.
When all of the programmed music pieces have been played, the PLAY indicator 18 is turned off and the pickup 55 is returned to the home position. After that, the disc 2 is released from the clamper 62 and the turntable 100 and returned to the disc storing part 32. At the same time, the content of the memory of the RAM 65 which memorizes the number of the playing times whthin a predetermined period per disc is increased by one (+1). Then the carrier assembly 64 is moved back to the home position.
Then the CPU 603 compares the new correspondence with an old correspondence between the disc number and the number of the store position, and performs the rearrangement of the discs by moving the carrier assembly and utilizing the vacant slots 200 provided in the disc storing part 32 (shown in FIG. 3). When all of the discs are rearranged and the actual order of arrangement of the discs becomes diential with the order of the arrangement of the discs memorized in the memory part, the temporarily stored correspondence between the disc number and the number of the storing position is memorized in place of the old correspondence. At the same time, data of the number of playing times for each disc is cleared.
In addition, instead of the number of times of playing, the number of times of selecting a disc can be used as the standard for the rearrangement. Further, by memorizing the playing (or selecting) date together with the above data, the standard of rearrangement will be a "weighted number of playing (selecting) times". With this method, it becomes possible to give a priority of determination of the position, to discs played or selected more recently, to realize more effective rearrangement in the practical use of the system. Further, the time of rearrangment is not limited to the avove example, and the rearrangement can be performed when the playing of the disc is taking place. Further, it is possible to design the system that that the rearragnement automatically performed when a predetermined time period has elapsed.
In the example of FIGS. 5A through 5D, the sensors 50a and 50b are spaced with each other in the direction of the disc arrangement. However, it is also possible to arrange these sensors in vertical relation with each other on the holder 51. In addition, if a light reflective material is used for the shutter 38b, then the light emitting element and the light receiving element of these sensors will be on the same side with respect to the shutter 38. Further, these sensors are not limited to the optical sensor and various types of sensors such as a pressure responsive sensor and a contact sensor may be used therefor.
As described in detail hereinabove, the disc playing system of the present invention is provided with means for detecting the presence of a disc in each of the disc storing slot of the disc storing part, which means includes a displacement members provided to each of the disc storing slot and to be moved when a disc is placed in the slot, and a sensor movable along the direction of the arrangement of the discs to detect the position of each displacement member in order. Therefore, the actuation of the slider is no more required for the detection of the disc presence, and the vacant slot is detected at vary high speed. Thus, it becomes possible to select the disc storing slots in which a disc is held, by memorizing the number of vacant slot in the memory means, and accordingly the playing of musics is performed very smoothly.
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