Light-weight high resolution viewer
View Patent ↗A magnification loupe carried by spectacles has a Galilean lens system comprising a single-element eyepiece lens and a two-element objective lens. The loupes may be mounted to eyeglass frames by a flip-up mounting member, or they may be mounted through the eyeglass lenses of the spectacles. The loupes provide high magnification while minimizing weight to thereby reduce strain and discomfort to users. In an exemplary embodiment, the objective lens has a non-circular shape that provides a wide field of view while further minimizing the weight of the loupe. A correction lens may be interchangeably coupled to the loupe housing to permit selective replacement with another correction lens to vary the working distance of the loupe.
1. A magnification loupe carried by a user wearable device, comprising:
a housing having a first end with a first aperture for supporting an eyepiece lens, and a second end with a second aperture for supporting an objective lens;
an eyepiece lens disposed in said first end of said housing; and
an objective lens disposed in said second end of said housing;
said objective lens having a non-circular shape, wherein at least two oppositely disposed arcuate first peripheral edges are defined by a first radius extending from a first center, and wherein at least two oppositely disposed arcuate second peripheral edges are defined by at least one second radius extending from at least a second center not coincident with said first center, said second radius having a length different from said first radius;
said eyepiece lens comprising a single lens element;
said objective lens comprising two lens elements;
wherein said eyepiece lens and said objective lens are constructed and arranged according to the following parameters:
Ele-
Thick-
Maximum
ment
Glass
η d
ν d
Radius
ness
Diameter
Sep.
I
Schott
1.589
61.3
R 1 = ∞
2.2
12.0
NSK5
R 2 = ∞
II
Schott
1.517
64.2
R 3 = 36.49
1.5
12.0
S 1 =
0.6
NBK7
R 4 = 18.48
III
Schott
1.805
25.4
R 5 = 85.68
1.6
D 1 = 22.24
S 2 =
14.46
NSF56
R 6 = 39.71
D 2 = 23.60
IV
Schott
1.517
64.2
R 7 = 39.71
6.65
D 3 = 23.60
NBK7
R 8 = 21.55
D 4 = 23.60
wherein the radius, thickness, and separation dimensions are given in millimeters; Roman numerals identify the lens elements in their respective order from an eyepoint side to an object side and element I is a representative correction lens; η d represents the refractive index of each element; η d is the abbe dispersion number; R 1 –R 8 represent the radii of respective refractive surfaces in order, from the eyepoint side to the object side; D 1 –D 4 represent the maximum clear lens aperture diameters of parent lens elements; and S 1 , S 2 represent the air space between the elements, measured along an optical centerline.
2. A magnification loupe carried by a user wearable device, comprising:
a housing having a first end with a first aperture for supporting an eyepiece lens, and a second end with a second aperture for supporting an objective lens;
an eyepiece lens disposed in said first end of said housing; and
an objective lens disposed in said second end of said housing;
said objective lens having a non-circular shape, wherein at least two oppositely disposed arcuate first peripheral edges are defined by a first radius extending from a first center, and wherein at least two oppositely disposed arcuate second peripheral edges are defined by at least one second radius extending from at least a second center not coincident with said first center, said second radius having a length different from said first radius;
said eyepiece lens comprising a single lens element;
said objective lens comprising two lens elements;
wherein said eyepiece lens and said objective lens are constructed and arranged according to the following parameters:
Maximum
Element
Glass
η d
ν d
Radius
Thickness
Diameter
Sep.
I
Schott NSK5
1.589
61.3
R 1 = 98.19
3.0
25.4
R 2 = 98.19
II
Schott NBALF4
1.580
53.9
R 3 = 52.10
1.5
D 1 = 13.00
S = 4.1
R 4 = 20.16
D 2 = 13.25
III
O'Hara STIH23
1.785
26.3
R 5 = 85.68
1.8
26.15
S = 13.59
R 6 = 43.17
IV
Schott NBK7
1.517
64.2
R 7 = 43.17
7.6
26.15
R 8 = 22.39
wherein the radius, thickness, and separation dimensions are given in millimeters; Roman numerals identify the lens elements in their respective order from an eyepoint side to an object side and element I is a representative lens of the user wearable device; η d represents the refractive index of each element; ν d is the abbe dispersion number; R 1 –R 8 represent the radii of respective refractive surfaces in order, from the eyepoint side to the object side; D 1 and D 2 represent the maximum clear lens aperture diameters of parent lens elements; and S 1 , S 2 represent the air space between the elements, measured along an optical centerline.
3. A magnification loupe carried by a user wearable device, comprising:
a housing having a first end with a first aperture for supporting an eyepiece lens, and a second end with a second aperture for supporting an objective lens;
a single element eyepiece lens disposed in said first end of said housing; and
a two element objective lens disposed in said second end of said housing;
said eyepiece lens and said objective lens constructed and arranged according to the following parameters:
Maximum
Element
Glass
η d
ν d
Radius
Thickness
Diameter
Sep.
I
Schott NSK5
1.589
61.3
R 1 = ∞
2.2
12.0
R 2 = ∞
II
Schott NBK7
1.517
64.2
R 3 = 36.49
1.5
12.0
S 1 = 0.6
R 4 = 18.48
III
Schott NSF56
1.805
25.4
R 5 = 85.68
1.6
D 1 = 22.24
S 2 = 14.46
R 6 = 39.71
D 2 = 23.60
IV
Schott NBK7
1.517
64.2
R 7 = 39.71
6.65
D 3 = 23.60
R 8 = 21.55
D 4 = 23.60
wherein the radius, thickness, and separation dimensions are given in millimeters; Roman numerals identify the lens elements in their respective order from an eyepoint side to an object side and element I is a representative correction lens; η d represents the refractive index of each element; ν d is the abbe dispersion number; R 1–R 8 represent the radii of respective refractive surfaces in order, from the eyepoint side to the object side; D 1 –D 4 represent the maximum clear lens aperture diameters of parent lens elements; and S 1 , S 2 represent the air space between the elements, measured along an optical centerline.
4. A magnification loupe carried by a user wearable device, comprising:
a housing having a first end with a first aperture for supporting an eyepiece lens, and a second end with a second aperture for supporting an objective lens;
a single element eyepiece lens disposed in said first end of said housing; and
a two element objective lens disposed in said second end of said housing;
said eyepiece lens and said objective lens constructed and arranged according to the following parameters:
Maximum
Element
Glass
η d
ν d
Radius
Thickness
Diameter
Sep.
I
Schott NSK5
1.589
61.3
R 1 = 98.19
3.0
25.4
R 2 = 98.19
II
Schott NBALF4
1.580
53.9
R 3 = 52.10
1.5
D 1 = 13.00
S 1 = 4.1
R 4 = 20.16
D 2 = 13.25
III
O'Hara STIH23
1.785
26.3
R 5 = 85.68
1.8
26.15
S 2 = 13.59
R 6 = 43.17
IV
Schott NBK7
1.517
64.2
R 7 = 43.17
7.6
26.15
R 8 = 22.39
wherein the radius, thickness, and separation dimensions are given in millimeters; Roman numerals identify the lens elements in their respective order from an eyepoint side to an object side; η d represents the refractive index of each element; ν d is the abbe dispersion number; R 1 –R 8 represent the radii of respective refractive surfaces in order, from the eyepoint side to the object side and element I is a representative lens of the user wearable device; D 1 and D 2 represent the maximum clear lens aperture diameters of parent lens elements; and S 1 , S 2 represent the air space between the elements, measured along an optical centerline.