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US 2008/0174879 A1Published application
Focus adjustable optical system
AssigneeGenius Electronic Optical Co., Ltd.
InventorShih-Han CHEN
Life of this patent
Estimating the term…
Abstract
A focus adjustable optical system includes a first lens unit and a second lens unit arranged on an optical axis in direction from the object side to the image side. The two opposite surfaces of each of the lenses of the first lens unit and second lens unit are non-spherical surfaces. Each lens of the first lens unit defines with the image side a fixed distance. The second lens unit has one lens movable by a low-power small-sized driving source along the optical axis to adjust its distance relative to the image side and to further adjust the focal distance while the distance between the first lens unit and the image plane remains unchanged.
Claims14
1-43. (canceled)
A focus adjustable optical system arranged on an optical axis between an object side and an image side, comprising:
- a first lens unit, said first lens unit comprising at least one lens set on said optical axis and defining a fixed distance from said lens to the image plane on the optical axis;
- a second lens unit spaced between said first lens unit and the image plane, said second lens unit comprising at least one lens movable along said optical axis to change the distance between the at least one lens of said second lens and the image plane;
- a third lens unit spaced between said second lens unit and the image plane, said third lens unit comprising at least one lens that defines with the image plane a fixed distance;
- wherein said first lens unit is comprised of first lens having positive diopter and a second lens having a negative diopter, said first lens and said second lens being arranged along said optical axis in direction from said object side to said second lens unit;
- said first lens unit wholly has a positive diopter;
- said second lens unit is comprised of a third lens having a positive diopter;
- said third lens unit is comprised of fourth lens having a negative diopter;
- and
- wherein said focus adjustable optical system further comprising a diaphragm arranged on said optical axis before the object-side lens surface of said first lens.
6 more elements
A focus adjustable optical system arranged on an optical axis between an object side and an image side comprising:
- a first lens unit, said first lens unit comprising at least one lens set on said optical axis, and defining a fixed distance from said lens to the image plane on the optical axis;
- a second lens unit spaced between said first lens unit:
- and the image plane, said second lens unit comprising at least one lens movable along said optical axis to change the distance between the at least one lens of said second lens and the image plane;
- a third lens unit spaced between said second lens unit and the image plane, said third lens unit comprising at least one lens that defines with the image plane a fixed distance;
- wherein said first lens unit is comprised of a first lens having a positive diopter and a second lens having a negative diopter, said first lens and said second lens being arranged along said optical axis in direction from said object side to said second lens unit;
- said first lens unit wholly has a positive diopter;
- said second lens unit is comprised of a third lens having a positive diopter;
- said third lens unit is comprised of a fourth lens having a negative diopter;
- and
- wherein said focus adjustable optical system further comprising a diaphragm arranged on said optical axis at the surface of said first lens facing said object side.
7 more elements
A focus adjustable optical system arranged on an optical axis between an object side and an image side, comprising:
- a first lens unit, said first lens unit comprising at least one lens set on said optical axis, and defining a fixed distance from said lens to the image plane on the optical axis;
- a second lens unit spaced between said first lens unit and the image plane, said second lens unit comprising at least one lens movable along said optical axis to change the distance between the at least one lens of said second lens and the image plane;
- a third lens unit spaced between said second lens unit and the image plane, said third lens unit comprising at least one lens that defines with the image plane a fixed distance;
- wherein said first lens unit is comprised of a first lens having a positive diopter and a second lens having a negative diopter, said first lens and said second lens being arranged along said optical axis in direction from said object side to said second lens unit;
- said first lens unit wholly has a positive diopter;
- said second lens unit is comprised of a third lens having a positive diopter;
- said third lens unit is comprised of a fourth lens having a negative diopter;
- and
- wherein said focus adjustable optical system further comprising a diaphragm arranged on said optical axis between said first lens and said second lens.
6 more elements
47-50. (canceled)
A focus adjustable optical system arranged on an optical axis between an object side and an image side, comprising
- a first lens unit, said first lens unit comprising at least one lens set on said optical axis, and defining a fixed distance from said lens to the image plan on the optical axis;
- a second lens unit spaced between said first lens unit and the image plane, said second lens unit comprising at least one lens movable along said optical axis to change the distance between the at least one lens of said second lens and the image plane;
- a third lens unit spaced between said second lens unit and the image plane, said third lens unit comprising at least one lens that defines with the image plane a fixed distance;
- and
- wherein said first lens unit is comprised of a first lens having a positive diopter;
- said second lens unit is comprised of a second lens having a negative diopter and a third lens having a positive diopter, said second lens and said third lens being arranged on said optical axis in direction from said first lens unit to said image side;
- said second lens unit wholly has a positive diopter;
- said third lens unit is comprised of a fourth lens having a negative diopter;
- said focus adjustable optical system further comprising a diaphragm arranged on said optical axis before the object-side lens surface of said first lens.
6 more elements
A focus adjustable optical system arranged on an optical axis between an object side and an image side, comprising:
- a first lens unit, said first lens unit comprising at least one lens set on said optical axis, and defining a fixed distance from said lens to the image plane on the optical axis;
- a second lens unit spaced between said first lens unit and the image plane, said second lens unit comprising at least one lens movable along said optical axis to change the distance between the at least one lens of said second lens and the image plane;
- and
- a third lens unit spaced between said second lens unit and the image plane, said third lens unit comprising at least one lens that define with the image plane a fixed distance;
- and
- wherein said first lens unit is comprised of a first lens having a positive diopter;
- said second lens unit is comprised of a second lens having a negative diopter aid a third lens having a positive diopter, said second lens and said third lens being arranged on said optical axis in direction from said first lens unit to said image side;
- said second lens unit wholly has a positive diopter;
- said third lens unit is comprised of a fourth lens having a negative diopter;
- said focus adjustable optical system further comprising a diaphragm arranged on said optical axis at the surface of said first lens facing said object side.
7 more elements
53-55. (canceled)
57-62. (canceled)
Dependencies are inferred from the claim text.