Dynamic information storage or retrieval – Dynamic mechanism subsystem – Access of multiple storage elements
Patent
1996-01-23
1998-05-26
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Access of multiple storage elements
369 772, 360 9804, G11B 1722
Patent
active
057577617
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a disc player having at least one disc magazine which contains a plurality of discs lying in receiving compartments one on top of the other, and further having a transport device which can travel in the direction of the stack of the disc magazine for transferring a desired disc between the receiving compartment and a playback unit.
BACKGROUND OF THE INVENTION
Disc players of the above type are known in a wide variety of embodiments. For example, EP 0 439 483 B1 shows a disc player having two disc magazines which are located opposite each other and include a plurality of disc holders which are seated in receiving compartments one above the other and each receive one disc, the device further including a transport device which can be moved in the direction of the stack of the disc magazines for conveying a disc, with the associated disc holder, back and forth between the disc magazines and a playback unit. The discs are therefore first placed into the disc holders, and the disc holders respectively occupied by a disc are subsequently inserted into the receiving compartments of the disc magazines. Usually, so-called CDs (compact discs) are involved, which have a long playing time, but nevertheless a small diameter of up to 8 cm, which permits the use of a playback unit and disc magazines of compact construction, so that the disc playback device has a relatively small overall size.
Moreover, in the interim a disc player has become known which plays a disc while it is held in a flat cassette serving to protect it. The cassette is provided on one hand with an access opening, through which the disc is gripped by the playback unit and rotated, and on the other hand with a window, through which the disc can be scanned while it rotates in the cassette by the playback head of the playback unit. In the unused state of the cassette, the window is closed by a sliding element integrated into the cassette, and is opened by a suitable mechanism when the cassette is inserted into the disc player and closed again when the cassette is withdrawn after the disc has been played. The discs accommodated in the protective cassettes are typically so-called mini-compact discs, which have an extremely long playing time but nevertheless a small diameter of up to 6 cm. The type of discs which are received in protective cassettes cannot be played in the disc players known up to now that include a large number of disc magazines which receive discs, particularly because these disc players do not possess any of the complex mechanisms disposed upstream of the playback unit for the purpose of operating the sliding element of the cassette.
SUMMARY OF THE INVENTION
The object of the invention is to create a disc player of the type mentioned at the outset with which discs received in flat protective cassettes can be played without a large structural outlay.
In accordance with the invention, this object is accomplished in that cassette having at least one window which is associated with the playback head of the playback unit and can be closed by a sliding element, receiving compartment of the disc magazine and can be gripped by the transport device, and transfers the sliding element into the open position when the cassette is inserted into the cassette holder, and on the other hand with an elastic projection which transfers the sliding element into the closed position when the cassette is withdrawn from the cassette holder.
The result of these measures is a structurally simple and compact disc player which permits the playback of discs accommodated in special cassettes. The cassette holder assures, on the one hand, a narrow stack spacing of the cassette holders with respect to each other and, on the other hand, reliable opening and closing of the sliding element. In the working position of the cassette, that is, in the state of the cassette being inserted into the cassette holder, the window of the cassette is kept open, making the disc available for playback, while in the non-working state of
REFERENCES:
patent: 4768116 (1988-08-01), Watanabe
patent: 4901172 (1990-02-01), Nakazawa et al.
patent: 4912575 (1990-03-01), Shiosaki
patent: 5228016 (1993-07-01), Menke
Heidersberger Boerge
Menke Wilhelm
Levy Stuart S.
Miller Brian E.
NSM Aktiengesellschaft
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