Microscope optical system and digital microscope having the same
AssigneeAsia Optical Co., Inc.
InventorChen-cheng Liao
Life of this patent
Estimating the term…
Abstract
A microscope optical system includes, in order from an object side to an image side, a first lens group, a second lens group, a stop, a third lens group, a fourth lens group and a sensor. The first to fourth lens groups all have at least one lens element and at least one of lens elements of the first to fourth lens groups has an aspheric surface. The microscope optical system satisfies several specific conditions so as to provide microscope images of high resolution and high zoom ratio. A digital microscope having the microscope optical system adopts a CCD sensor so that a observer may observe microscope images displayed on a large display screen and store the images for subsequent edition or inspection.
Claims20
A microscope optical system comprising, in order from an object side to an image side, a first lens group, a second lens group, a stop, a third lens group, a fourth lens group and a sensor, each lens groups comprising at least one lens element, at least one of said lens elements of the lens groups having one aspheric surface, wherein when the microscope is zoomed from a wide-angle end to a telephoto end, the first and fourth lens groups are kept stationary, while the second and third lens groups are movable, and wherein the following condition is satisfied:
- 0.5
- <
- F
-
-
- 1
- F
-
-
- 2
- <
- 1.0
- where F1 is combined focus of the first lens group and F2 is combined focus of the second lens group.
A digital microscope comprising an optical system, which comprises a first lens group, a second lens group, a stop, a third lens group, a fourth lens group and a sensor in order from an object side to an image side, each lens groups comprising at least one lens element, at least one of said lens elements of the lens groups having an aspheric surface;
- wherein when the optic systems is zoomed from a wide-angle end to a telephoto end, the first and fourth lens groups are kept stationary and the second and third lens groups are movable, and the following condition is satisfied:
- 0.5
- <
- F
-
-
- 1
- F
-
-
- 2
- <
- 1.0
- where F1 is combined focus of the first lens group and F2 is combined focus of the second lens group.
Dependencies are inferred from the claim text.