Zoom lens barrel and camera
AssigneeMinolta Co., Ltd.
InventorsTetsuya Uno, Dai Shintani, Norihiro Inoue
Life of this patent
Estimating the term…
Abstract
A zoom lens barrel which is an integrated zoom and focus drive type zoom lens barrel that moves lens units on a single zoom line having plurality of focusing sections and plurality of zooming sections, wherein the single zoom line has characteristic that the “rate of change of the relative distance of the two lens units with regard to a barrel rotation angle” in each focusing section becomes smaller in the focusing sections of the telephoto side.
Claims7
A camera comprising:
- a first lens unit;
- a second lens unit;
- a cam mechanism which moves the first lens unit and the second lens unit on a single zoom line consisted of plurality of focusing sections and plurality of zooming sections;
- wherein a rate of change of the relative distance of the first lens unit and the second lens unit with regard to a barrel rotation angle in each focusing section becomes smaller in the focusing sections of the telephoto side.
A lens barrel comprising:
- a first lens unit;
- a second lens unit;
- a cam mechanism which moves the first lens unit and the second lens unit on a single zoom line consisted of plurality of focusing sections and plurality of zooming sections;
- wherein a rate of change of the relative distance of the first lens unit and the second lens unit with regard to a barrel rotation angle in each focusing section becomes smaller in the focusing sections of the telephoto side.
A lens drive method which moves a plural lens unit on a single zoom line consisted of plurality of focusing sections and plurality of zooming sections, the method comprising:
- moving the lens units at a first rate of change of the relative distance of the lens units with regard to a barrel rotation angle in a first focusing section;
- moving the lens units at a second rate of change of the relative distance of the lens units with regard to the barrel rotation angle in a second focusing section which positioned in the telephoto side than the first focusing section,
- wherein the second rate is smaller the first rate.
Dependencies are inferred from the claim text.