Like Plano-convex lens, double convex lenses have positive focal lengths and form both real and virtual images. Symmetry is assured by finishing both surfaces with the same tool. Because of symmetry, aberrations including coma, distortion and lateral chromatic aberration almost exactly canceled at unit conjugate radio. Double convex lenses have shorter focal lengths than Plano-convex lenses of equal diameter and surface radius.
Applications:
Beam Expanders
Projection Optics Systems
Optical Viewers
Optical Character Readers
Capability:
|
Attribute
|
Commercial
|
High Precision
|
|
Typical Material
|
BK7, Fused Silica, B270, Ge, Si, CaF2
|
|
Typical Dimension Φ (mm)
|
2, 4, 6, 12.7, 25.4, 30, 38, 50.8, 95, 160
|
|
Diameter Tolerance (mm)
|
+0.00 / -0.15
|
+0.00 / -0.02
|
|
Paraxial Focal Length
|
±2%
|
±0.5%
|
|
Centration (arc min)
|
< 3’
|
< 1’
|
|
Surface Irregularity
|
λ/4
|
λ/10
|
|
Surface Quality (Scratch / dig)
|
60-40
|
10-5
|
|
Bevel (face width × 45° mm)
|
0.2 - 0.5
|
0.05 - 0.2
|
Note:
Other size and coatings are available upon request.
Any optical materical are available upon request.
|
Item#
|
Material
|
f(mm)
|
F(mm)
|
R(mm)
|
Tc(mm)
|
Te(mm)
|
Fb(mm)
|
|
DCX1225
|
BK7
|
12.7
|
25.0
|
25.35
|
3.62
|
2.0
|
23.82
|
|
DCX1230
|
BK7
|
12.7
|
30.0
|
30.55
|
3.33
|
2.0
|
28.89
|
|
DCX1240
|
BK7
|
12.7
|
40.0
|
41.02
|
2.99
|
2.0
|
39.04
|
|
DCX1250
|
BK7
|
12.7
|
50.0
|
51.40
|
2.79
|
2.0
|
49.08
|
|
DCX1275
|
BK7
|
12.7
|
75.0
|
77.45
|
2.52
|
2.0
|
74.24
|
|
DCX12100
|
BK7
|
12.7
|
100.0
|
103.28
|
2.39
|
2.0
|
99.16
|
|
DCX2535
|
BK7
|
25.4
|
35.0
|
35.08
|
6.76
|
2.0
|
32.66
|
|
DCX2550
|
BK7
|
25.4
|
50.0
|
50.93
|
5.22
|
2.0
|
48.22
|
|
DCX2575
|
BK7
|
25.4
|
75.0
|
77.09
|
4.11
|
2.0
|
73.63
|
|
DCX25100
|
BK7
|
25.4
|
100.0
|
103.04
|
3.57
|
2.0
|
98.73
|
|
DCX25200
|
BK7
|
25.4
|
200.0
|
207.00
|
2.78
|
2.0
|
199.07
|
|
DCX25250
|
BK7
|
25.4
|
250.0
|
258.90
|
2.62
|
2.0
|
249.17
|
|
DCX25500
|
BK7
|
25.4
|
500.0
|
518.30
|
2.31
|
2.0
|
499.21
|
|
DCX38100
|
BK7
|
38.0
|
100.0
|
102.57
|
6.55
|
3.0
|
97.78
|
中文版
English
Double-Convex Lens