Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2000-05-25
2003-12-02
Watko, Julie Anne (Department: 2652)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
Reexamination Certificate
active
06657928
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disc player, and more particularly to techniques for simplifying a mechanical construction for driving a pickup feeding mechanism which moves an optical pickup for reading information from an optical disc in a radial direction of the disc, and for simplifying a mechanical construction for detecting a mechanism status.
2. Description of the Related Art
The disc player for reading information from a disc (optical disc), such as a CD player, basically includes a disc rotating mechanism for rotating a disc on a turntable, a disc introducing mechanism for introducing the disc onto the turntable of a disc drive portion, and a pickup feeding mechanism for moving an optical pickup for reading information from the disc in a radial direction of the disc.
Three motors are respectively provided for those three mechanisms, and independently drive the latter. Quick response and high speed are essential to the performance of the disc rotating mechanism. To satisfy the requirements, the disc rotating mechanism is driven by a disc rotating mechanism motor directly coupled to the turntable.
The disc introducing mechanism sequentially moves the disc in vertical and horizontal directions with respect to a plane of the turntable. Therefore, the mechanism generally includes two types of operating members, a transport roller for transporting the disc onto the turntable along a horizontal plane, and a damper member for chucking the disc onto the turntable, and a shift plate for selectively controlling the two operating members. A disc introducing mechanism motor rectilinearly moves a shift plate to selectively control the transport roller or the damper member and to drive the transport roller to turn.
High precision is essential to the pickup feeding mechanism. Therefore, the optical pickup is rectilinearly moved with high precision by a lead screw engaging with the optical pickup, and the lead screw is driven to rotate by a pickup feeding mechanism motor located near the lead screw.
To select the driving of those mechanisms and an operation mode of a control circuit/signal processing circuit smoothly and at proper timings, the disc player includes plural kinds of detecting elements, such as detector sensor and detector switch. Specific examples of those detecting elements are a disc detecting element for detecting the insertion of a disc, a chucking end detecting element for detecting a chucking operation end in the disc introducing mechanism, and a pickup position detecting element for detecting that the optical pickup is at a disc inner-rim side position. Those detecting elements are used for the starting/stopping commands for drive selection of those mechanisms in the following ways.
A signal derived from a disc detecting element is used for a start command of starting up a disc introducing mechanism motor at the time of disc loading, and a stop command for stopping the disc introducing mechanism motor at the time of disc ejection, and others. A signal derived from the chucking end detecting element is used for a start command for the pickup feeding mechanism motor when a disc loading mode is shifted to a disc reproduction mode, a stop command for the disc introducing mechanism motor, and others. A signal derived from the pickup position detecting element is used for a start signal for the disc rotating mechanism motor in a disc reproduction mode, a stop signal for the disc rotating mechanism motor when the disc reproduction mode is shifted to the disc ejecting mode, a start signal for the disc introducing mechanism motor, and others.
The “disc inner-rim side position” of the optical pickup, which is to be detected by the pickup position detecting element is a position at which the optical pickup may read TOC (table of contents) information as management information stored in the disc inner-rim side area (lead-in area) of a disc recording area. In the disc reproduction mode, the optical pickup first reads the TOC information recorded in the lead-in area of the disc at this disc inner-rim side position, and a disc reproducing operation starts on the basis of the TOC information. The pickup position detecting element is provided for detecting that the optical pickup is at such a disc inner-rim side position.
The conventional disc player described above suffers from problems of requiring a large number of motors and detecting elements, and construction complexity.
In the conventional construction in which drive motors are respectively provided for the disc rotating mechanism, disc introducing mechanism and pickup feeding mechanism, three motors are required. In the mechanism, use of the three motors increases the number of component parts inclusive of motor support members and drive force transmission members, makes the related structure complicated, requires large parts occupying spaces, restricts the layout and design of related members, and brings about increase of the overall mechanism size and complexity of construction. The number of wires is also increased since electric power is supplied to the motors and those motors are controlled independently. Cost of the motors is relatively large in the cost of the overall mechanism. Thus, the use of three motors hinders the effort of reducing cost to manufacture.
In the conventional disc player, the three mechanisms are driven by their own motors, respectively. Accordingly, at least three detecting elements, a disc detecting element, a chucking end detecting element, and a pickup position detecting element, are required for the drive selection of the mechanism. Where the three kinds of detecting elements are used, the number of the wires for the detecting elements is increased. While the detecting element occupies a less space, the increase of the elements restricts the layout and design of related members, and makes the overall mechanism complicated.
SUMMARY OF THE INVENTION
An object of the invention is to solve the technical problems as mentioned above and to provide a disc player which reduces the number of the motors and the detecting elements and the number of related members inclusive of wires, and has advantages of improvement of parts layouts and design freedom, size reduction and simplification of the overall mechanism, cost reduction, and the like.
To solve the above problems, according to the present invention, a disc introducing mechanism or a pickup feeding mechanism are selectively driven by a single drive source, thereby succeeding in reducing the number of required drive sources.
Specifically, a disc player according to the invention basically includes a disc rotating mechanism for rotating a disc on a turntable, a disc introducing mechanism for introducing the disc onto the turntable of a disc drive portion, and a pickup feeding mechanism for moving an optical pickup for reading information on an optical disc in a radial direction of the disc.
In a disc player according to a first aspect of the invention, a disc positioning mechanism for positioning for positioning the disc on the turntable in accordance with a diameter of the disc is provided on the base member. The base member is supported on a chassis by an elastic member, and a floating lock mechanism is provided for fixing the base member at a fixed position on the chassis.
Thus, the disc positioning mechanism, together with the disc rotating mechanism, the disc introducing mechanism and the pickup feeding mechanism, are provided on the base member to be put in a floating state. Accordingly, it is little displaced when it is locked with the floating lock mechanism.
According to a second aspect of the present invention, the disc positioning mechanism includes a disc stopper for positioning the disc on the turntable, the disc stopper being urged by a disc introduced by the disc introducing mechanism to be movable, a lock portion being movable between a lock position for locking the disc stopper at a position based on a diameter of the disc and a lock removal position allowing the disc stopper
Hoshino Motonori
Nakatani Mitsuo
Clarion Co. Ltd.
McGinn & Gibb PLLC
Watko Julie Anne
LandOfFree
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