Back to results
US 7,443,601 B2Granted
Zoom optical system
AssigneeCanon Kabushiki Kaisha
InventorsHirofumi Yoshida, Koshi Hatakeyama
Life of this patent
Estimating the term…
Abstract
At least one exemplary embodiment is directed to a zoom optical system which includes a plurality of variable power optical units of which optical power varies accompanied by variable power, a fixed optical unit of which optical power does not vary accompanied by variable power, and a moving optical unit which moves accompanied by variable power.
Claims20
A zoom optical system comprising:
- a plurality of variable power optical units of which optical power changes as magnification varies, wherein the plurality of variable power optical units each has plural optical elements moving in a direction different from an optical axis as magnification varies;
- a fixed optical unit of which optical power does not change as magnification varies;
- and
- a moving optical unit which moves as magnification varies,
- wherein when the maximum value of the absolute value of the optical power in an optical group of the plurality of variable power optical units is |Φd| max within the entire range of variable power positions, and the maximum value of the absolute value of the optical power of the moving optical unit is |Φs| max within the entire range of variable power positions, the following condition
- |Φs| max <|Φd| max
- is satisfied.
4 more elements
A zoom optical system comprising:
- a plurality of variable power optical units of which optical power changes as magnification varies, wherein the plurality of variable power optical units each has plural optical elements moving in a direction different from an optical axis as magnification varies;
- a fixed optical unit of which optical power does not change as magnification varies;
- and
- a moving optical unit which moves as magnification varies,
- wherein the moving optical unit has an optical element for moving in the direction different from the optical axis;
- and
- wherein when the maximum value of the absolute value of the amount of shift of an optical element of the plurality of variable optical units within the entire range of variable power positions is |Dd| max, and the maximum value of the absolute value of the amount of shift of the optical element of the moving optical units within the entire range of variable power positions is |Ds| max, the following condition
- |Ds| max <|Dd| max
- is satisfied.
6 more elements
A zoom optical system comprising:
- a plurality of variable power optical units of which optical power changes as magnification varies, wherein the plurality of variable power optical units each has plural optical elements moving in a direction different from an optical axis as magnification varies;
- a fixed optical unit of which optical power does not change as magnification varies;
- and
- a moving optical unit which moves as magnification varies,
- wherein when the amount of movement within the entire zoom range of the moving optical unit is d, and the entire length of the entire system is T, the following condition
- d/T<0.6
- is satisfied.
4 more elements
A zoom optical system comprising:
- a plurality of variable power optical units of which optical power changes as magnification varies, wherein the plurality of variable power optical units each has plural optical elements moving in a direction different from an optical axis as magnification varies;
- a fixed optical unit of which optical power does not change as magnification varies;
- and
- a moving optical unit which moves as magnification varies,
- wherein the plurality of variable power optical units have a first variable power optical unit and a second variable power optical unit;
- and
- wherein when the maximum value of the absolute value of the optical power in the first and second variable power optical units in the entire zoom range is |Φ| max and Φ1 is the first variable power optical unit optical power and Φ2 is the second variable power optical unit optical power then when the value of sum of the optical powers in an arbitrary zoom position of the first and second variable power optical units is ΦAB=Φ1+Φ2, the following condition
- −|Φ| max ≦ΦAB ≦|Φ| max
- is satisfied.
6 more elements
A zoom optical system comprising:
- a plurality of variable power optical units of which optical power changes as magnification varies, wherein the plurality of variable power optical units each has plural optical elements moving in a direction different from an optical axis as magnification varies;
- a fixed optical unit of which optical power does not change as magnification varies;
- and
- a moving optical unit which moves in the direction different from the optical axis as magnification varies.
1 more element
Dependencies are inferred from the claim text.