Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-04-03
2007-04-03
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C399S016000, C399S016000, C399S016000, C399S016000
Reexamination Certificate
active
11122526
ABSTRACT:
The present invention provides a lens apparatus including a fixed lens barrel, a cam ring that is rotatable relative to the fixed lens barrel, a first lens holding frame adapted to move, upon rotation of the cam ring, relative to the fixed lens barrel along the optical axis direction over the range from a collapsed position in which image taking is not allowed to an extended position in which image taking is allowed, a second lens holding frame disposed on the image side of the first lens holding frame, and a linear driving portion disposed outside the cam ring, for driving the second lens holding frame along the optical axis direction using a coil and a magnet. The length of the lens apparatus is relatively short and it is advantageous in portability.
REFERENCES:
patent: 5860030 (1999-01-01), Tada et al.
patent: 6606206 (2003-08-01), Takeshita et al.
patent: 2004/0125225 (2004-07-01), Noguchi
patent: 08-095142 (1996-04-01), None
patent: 08-248291 (1996-10-01), None
patent: 10-197775 (1998-07-01), None
patent: 2001-324663 (2001-11-01), None
patent: 2003-131111 (2003-05-01), None
Canon Kabushiki Kaisha
Morgan & Finnegan , LLP
Thompson Timothy
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