Optical: systems and elements – Lens – With support
Reexamination Certificate
2007-03-09
2008-09-09
Ben, Loha (Department: 2873)
Optical: systems and elements
Lens
With support
C359S822000, C359S823000, C359S826000, C359S701000, C396S072000, C396S079000, C396S349000
Reexamination Certificate
active
07423822
ABSTRACT:
The present invention is directed to a lens barrel that is simplified in structure with the reduced number of components and is facilitated in assembly and associated adjustment. The lens barrel enables an appropriate frictional force against the rotation force caused by manipulating rotary operation rings such as a zooming ring and a focusing ring to effect the optimum operating force on the rotary operation rings. In the lens barrel where a fixed barrel has its inner and outer circumferential surfaces provided with at least two slidable-rotatable members that are rotatably held about the optical axis but unable to move along the optical axis, an annular member is secured to the fixed barrel between the slidable-rotatable members, the annular member being pivotal about the optical axis and being provided with resilient protrusions on the opposite major surfaces toward the subject and the image field; and the resilient protrusions are pressed against a rear end face of one of the slidable-rotatable members closer to the subject and against a fore end face of the other slidable-rotatable member closer to the image field.
REFERENCES:
patent: 2908209 (1959-10-01), Marvin et al.
patent: 3484159 (1969-12-01), O'Donnell et al.
patent: 4303306 (1981-12-01), Ookawa
patent: 6751032 (2004-06-01), Nomura et al.
patent: 6909464 (2005-06-01), Nomura et al.
patent: 7259923 (2007-08-01), Nuno et al.
patent: 2000-180689 (2000-06-01), None
patent: 2001-305409 (2001-10-01), None
Miyauchi Masanori
Takahashi Yasuhide
Ben Loha
Jacobson & Holman PLLC
Tamron Co., Ltd.
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