Optical disc play-back device of the carousel type, having a mechanism for reducing access type to any selected disc
AssigneeNippon Columbia Co., Ltd.
InventorsJun Sakurai, Toshiyuki Kajikano
Life of this patent
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Abstract
An optical disc playback device of the so-called "carousel" type comprises a disc transport turntable rotatably mounted within the player housing. The underside of the turntable has an annular ridge with notches formed therein, and the housing comprises a photocouple which detects the presence or absence of the notches. The notches are so configured that each disc-holding section of the turntable has a distinct set of notches associated therewith, and each set of notches includes a central position-indicating notch and disc number-indicating notches disposed symmetrically on both sides of the central position-indicating notch.
Claims19
An optical disc playback device, comprising a housing, a disc transport turntable rotatably mounted within said housing, said disc transport turntable being adapted to receive a plurality of optical discs and upon rotation of said turntable to transport said discs within said housing to a corresponding plurality of predetermined locations, a disc-rotating and optical read-out subassembly disposed within said housing adjacent one of said predetermined locations;
- said turntable comprising a plurality of disc-holding sections and an axially extending annular rib formed on its underside;
- said annular rib having formed therein a distinct set of notches corresponding to each of said disc-holding sections, each said set of notches comprising a central position-indicating notch and disc number-indicating notches disposed symmetrically on both sides of said central position-indicating notch;
- said device further comprising optical detecting means cooperating with said annular rib to detect a presence or absence of said notches.
An optical disc playback device, comprising a housing, a tray disposed within said housing, a disc transport turntable rotatably mounted on said tray, said disc transport turntable being adapted to receive a plurality of optical discs and upon rotation of said turntable to transport said discs within said housing to a corresponding plurality of predetermined locations, a disc-rotating and optical read-out subassembly disposed within said housing adjacent one of said predetermined locations;
- said turntable comprising a plurality of disc-holding sections and an axially extending annular rib formed on its underside;
- said annular rib having formed therein a distinct set of notches corresponding to each of said disc-holding sections, each said set of notches comprising a central position-indicating notch and disc number-indicating notches disposed symmetrically on both sides of said central position-indicating notch;
- said device further comprising optical detecting means cooperating with said annular rib to detect a presence or absence of said notches.
Dependencies are inferred from the claim text.