US 7,791,825 B2 · Macro objective

Abstract

A description is given of a macro objective (M) with a corrective compensation of aberrations (Continuous Aberration Suppression; CAS). The macro objective has a first positive optical subassembly (A), a second nearly afocal optical subassembly (B), a stop (APE), a third nearly afocal optical subassembly (B′) and a fourth positive optical subassembly (A′). The third optical subassembly (B′) and the fourth positive optical subassembly (A′) are designed with mirror symmetry relative to the optical subassemblies (A, B) upstream of the stop (APE). The nearly afocal optical subassemblies (B, B′) are displaced jointly inside the macro objective (M) along the optical axis (OA) with the aid of mechanical means in conjunction with linear magnifications of β′≠−1. As a result, the macro objective (M) achieves outstanding imaging properties both over a wide range of linear magnifications (β′=−2.0 to −0.5) and over a wide wavelength spectrum.

Claims20

Dependent claims

A macro objective of holosymmetric design for the measure of magnification β′=−1, comprising the following elements when viewed in the specified sequence from an object plane:

a first positive optical subassembly;
a second nearly afocal optical subassembly;
a third nearly afocal optical subassembly;
and
a fourth positive optical subassembly;
the objective further comprising mechanical means for jointly displacing the second and third optical subassemblies (B, B′) inside the macro objective along the optical axis, the spacing between the second and third subassemblies remaining constant during the displacement.

3 more elements

A macro objective having the following elements when viewed in the specified sequence from the object plane:

a) a first positive optical subassembly, comprising
a1) a first positive meniscus lens, and
a2) a second negative meniscus lens;
b) a second nearly afocal optical subassembly, comprising
b1) a third positive biconvex lens, and
b2) a fourth negative biconcave lens;
c) a stop;
d) a third nearly afocal optical subassembly;
and
e) a fourth positive optical subassembly;
the third optical subassembly and the fourth positive optical subassembly being designed with mirror symmetry relative to the optical subassemblies upstream of the stop.

8 more elements

A macro objective having the following elements when viewed in the specified sequence from the object plane:

a) a first positive optical subassembly, comprising
a1) a first positive meniscus lens, the convex surface thereof pointing in the direction of the object plane, and the concave surface pointing in the direction of the image plane, and
a2) a second negative meniscus lens, the convex surface thereof pointing in the direction of the object plane, and the concave surface pointing in the direction of the image plane,
b) a second nearly afocal optical subassembly, comprising
b1) a third positive biconvex lens, the more strongly curved first convex surface thereof pointing in the direction of the object plane, and the second more weakly curved convex surface pointing in the direction of the image plane, and
b2) a fourth negative biconcave lens, the less strongly curved first concave surface thereof pointing in the direction of the object plane, and the second more strongly curved concave surface pointing in the direction of the image plane;
c) a stop;
d) a third nearly afocal optical subassembly;
and
e) a fourth positive optical subassembly;
the third optical subassembly and the fourth positive optical subassembly being designed with mirror symmetry relative to the optical subassemblies upstream of the stop.

8 more elements

A macro objective comprising the following elements when viewed in the specified sequence from an object plane:

a first positive optical subassembly;
a second nearly afocal optical subassembly;
a third nearly afocal optical subassembly;
and
a fourth positive optical subassembly;
the objective further comprising mechanical means for jointly displacing the second and third optical subassemblies (B, B′) inside the macro objective along the optical axis, the spacing between the second and third subassemblies remaining constant during the displacement, wherein the radii, thicknesses, media refractive indices nd and Abbe numbers νd of the lenses are to be found in the following value ranges:
Refer-
Thickness d
ence
Radius R [in
[in units of the
Media
Abbe
symbol
units of system
system focal length
refractive
number
n
focal length f′e]
f′e]
index nd
νd
R1
0.36 < R1 < 0.44
d1
0.030 < d1 < 0.040
1.882997
40.76
R2
0.93 < R2 < 1.14
R3
0.36 < R3 < 0.44
d3
0.034 < d3 < 0.042
1.613360
44.49
R4
0.19 < R4 < 0.24
R5
0.20 < R5 < 0.25
d5
0.038 < d5 < 0.048
1.592400
68.40
R6
−5.9 < R6 < −4.8
d6
0.12 < d6 < 0.015
1.637750
42.41
R7
0.23 < R7 < 0.29
b, c
0.12 < (b + c) < 0.15
the media refractive indices nd being specified for the Fraunhofer line d (λ=587.5618 nm), and
the Abbe numbers νd being specified for the Fraunhofer line d (λ=587.5618 nm).

54 more elements

Dependencies are inferred from the claim text.

Macro objective

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Macro objective

Life of this patent

Abstract

Claims20