 Magnetic thrust bearing with permanent bias flux |
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| Motor |
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Position detecting mechanisms for recording media
| Details |
Inventors: Nakata, Toshio; Okumura, Naoyuki;
Assignee: Seiko Epson Corporation (Tokyo, JP)
Primary Examiner: Tupper; Robert S.
Assistant Examiner: Letscher; George J.
Attorney, Agent or Firm: Janofsky; Eric B.
An information recording/reproducing device is provided with design features permitting are reduction in device height making it readily suitable for compact utility in a computer assembly, such as, a laptop computer or the like as well as a simplification of parts to provide for a reduction in manufacturing and assembly costs. These features include a structure for miniaturization and simplification of the collet mechanism and its assembly for clamping the recording medium, and the employment of a light guide member in the recording medium detection system for detecting the instantaneous rotational position of the recording medium from which a timing signal is derived. With the improvement of the clamping mechanism and use of a light guide member, significant miniaturization and thinning or reduction in casing height of the device can be achieved. Also, a simple but highly effective locking mechanism, not requiring a separate assemblage of parts, is utilized for preventing the extended carriage arm of the recording/reproducing head from accidentally transferring from its standby position to its operational position in the absence of a recording medium inserted into the information recording/reproducing device subjecting it to damage. |
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DETAILED DESCRIPTION According to this invention, an information recording/reproducing device comprises a medium driving mechanism to rotatably drive a recording medium, and a clamping mechanism for clamping a recording medium in a medium support section of the medium driving mechanism.
The clamping mechanism includes a collet for insertion into the center hole of the recording medium and is provided with a shaft, comprising the center of rotation of the collet, integrally formed with the back of the collet.
A collet supporting member supports the collet at its shaft and is adapted for moving the collet from a standby position to a clamping position for securing the recording medium for rotational movement with motor hub of the drive motor.
Collet retaining member is provided with the collet supporting member to permit sliding movement of collet supporting member relative to the collet shaft which permits the collet to be placed in a state of higher degree of rotational freedom when the collet is lowered and placed in its medium clamping position.
The clamping mechanism of this invention requires only three major components comprising the collet, the collet supporting member and the collet retaining member, so that the assembly of these components can be easily accomplished without any securing component, such as, a fastener, and are designed to provide a collet structure of lower height so that the assembled structure permits a recording/reproducing device of reduced cross sectional configuration.
In the description of this invention, the term "information recording/reproducing device" refers to a device having either a recording function for recording data or information onto a recording medium or a reproducing function of reading or playback of data or information from a recording medium, or a device capable of performing both of these functions.
In the preferred embodiment of this invention, the collet is provided with an integral shaft with a rim member formed on its other end which extends radially outward relative the collet shaft so that the collet retaining member can maintain a constant bias on the collet shaft from the upper end of the rim member, while also functioning as a collet supporting and holding means, in combination with the collet supporting member, to securely hold and retain the collet on the collet supporting member
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Generators or Motors 
