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US 9,958,660 B2Granted
Imaging apparatus including variable power relay optical system
AssigneeOlympus Corporation
InventorKazuhiro Hayashi
Life of this patent
Estimating the term…
Abstract
A variable power relay optical system is arranged closer to an image side than an imaging optical system. The variable power relay optical system includes, in order from a side of the imaging optical system, a front group that is arranged between the imaging optical system and a position of an image of a sample that is formed by the imaging optical system, the front group forming an intermediate image formed by reducing the image, and a rear group that forms a relay image formed by magnifying the intermediate image, the rear group including a plurality of lens groups that each move along an optical axis so as to change magnification of the rear group without changing a distance from the front group to the relay image.
Claims12
An imaging apparatus comprising, in order from an object side:
- an imaging optical system;
- a variable power relay optical system arranged on an image side of the imaging optical system;
- and
- an imaging element that images a relay image,
- wherein the variable power relay optical system comprises, in order from the object side:
- a front group that is arranged between the imaging optical system and a position of an image of a sample that would be formed by the imaging optical system in the absence of the variable power relay optical system, the front group forming an intermediate image formed by reducing the image;
- and
- a rear group that forms a relay image formed by magnifying the intermediate image, the rear group comprising a plurality of lens groups, and the plurality of lens groups including lens groups that are movable along an optical axis so as to change a magnification of the rear group without changing a distance from the front group to the relay image,
- wherein the front group comprises a first lens group having positive power,
- wherein the rear group comprises, in order from the object side:
- a second lens group having positive power;
- a third lens group having negative power, the third lens group being movable along the optical axis;
- a fourth lens group having positive power, the fourth lens group being movable along the optical axis;
- and
- a fifth lens group having positive power, the fifth lens group being movable along the optical axis,
- wherein the first lens group includes a meniscus lens having a convex surface on an object side of the meniscus lens, and
- wherein the following conditional expression is satisfied:
- 0.7≤βL1≤0.9,
- where βL1 is a magnification of the first lens group that is defined as (an image height of the intermediate image)/(an image height of the image that would be formed by the imaging optical system in the absence of the variable power relay optical system).
16 more elements
An imaging apparatus comprising, in order from an object side:
- an imaging optical system;
- a variable power relay optical system arranged on an image side of the imaging optical system;
- and
- an imaging element that images a relay image,
- wherein the variable power relay optical system comprises, in order from the object side:
- a front group that is arranged between the imaging optical system and a position of an image of a sample that would be formed by the imaging optical system in the absence of the variable power relay optical system, the front group forming an intermediate image formed by reducing the image;
- and
- a rear group that forms a relay image formed by magnifying the intermediate image, the rear group comprising a plurality of lens groups, and the plurality of lens groups including lens groups that are movable along an optical axis so as to change a magnification of the rear group without changing a distance from the front group to the relay image,
- wherein the front group comprises a first lens group having positive power,
- wherein the rear group comprises, in order from the object side:
- a second lens group having positive power;
- a third lens group having negative power, the third lens group being movable along the optical axis;
- a fourth lens group having positive power, the fourth lens group being movable along the optical axis;
- and
- a fifth lens group having positive power, the fifth lens group being movable along the optical axis,
- wherein the second lens group includes a first lens on a side of the second lens group closest to the object, the first lens having positive power,
- wherein the first lens has a convex surface on an image side thereof, the convex surface having a refractive power stronger than that of a surface on an object side of the first lens, and
- wherein the following conditional expression is satisfied:
- 1.4≤|βL1−2|≤2.2,
- where βL1−2 is a comprehensive magnification of the first lens group and the second lens group, and is defined as (an image height of a relay image formed by the first lens group and the second lens group)/(an image height of the image that would be formed by the imaging optical system in the absence of the variable power relay optical system).
17 more elements
Dependencies are inferred from the claim text.