Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-03-28
2006-03-28
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S238000, C356S614000, C033S0010PT
Reexamination Certificate
active
07019281
ABSTRACT:
A rotation information record surface of a rotary disk is disposed at an intermediate position between a fixing point of the rotary disk and a rotary shaft and a fixing position of a detection head, so that a stable gap can be obtained with a variation due to thermal expansion being reduced. In order to attain this, the fitting portion of the rotary disk is shaped to have a first fitting portion and a second fitting portion. The first fitting portion is provided for attaining satisfactory coaxiality, and the second fitting portion is adapted to form a clearance into which bonding means such as an adhesive is to be infused. With the above structure, an optimum detection position (i.e. an optimum gap position) would not be varied by a change in the ambient temperature.
REFERENCES:
patent: 5017776 (1991-05-01), Loewen
patent: 60-140119 (1985-07-01), None
patent: 62-3617 (1987-01-01), None
patent: 5-39410 (1993-02-01), None
patent: 5-39411 (1993-02-01), None
patent: 6-302032 (1994-10-01), None
patent: 2810521 (1998-07-01), None
patent: 2862417 (1998-12-01), None
English Abstract for Japanese Patent Application Laid-Open No. 5-240613 (from which Japanese Patent Publication No. 2862417 issued, which is listed as item “A”).
English Abstract for Japanese Patent Application Laid-Open No. 4-130221 (from which Japanese Patent Publication No. 2810521 issued, which is listed as item “B”).
Atsuta Akio
Igaki Masahiko
Allen Stephone B.
Lee Patrick J.
Morgan & Finnegan L.L.P.
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