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f-theta
Design wavelength
Focal length f
Entrance pupil diameter
Scanning angle
Scanning Range
Telecentric
Working distance (WD)
Transmittance [Incident angle 0°]
A
B
C
D
E
F
φG
φH
I
φJ
K
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F-Theta Lenses are used for laser marking, bar code reader, laser micromachining and other laser applications.

◦F-Theta lenses convert a rotational movement of a galvanometer mirror into a linear motion on the focal plane by using distortion effects.
◦Telecentric type is also available that can be irradiated vertically to the focusing plane.
◦Also available for fundamental YAG laser (1064nm), harmonic lasers (266nm, 355nm, 532nm).

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Technical Data
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Guide

▶Transmittance value is a representative value only and is not guaranteed. If you have any questions, please feel free to contact our Sales Division.
▶We accept orders to suit customized requirements.
▶ We also fabricate laser scanning systems which combine the galvanometer mirror and fθ lens as a unit.

Attention

▶We do not recommend using fθ lens in an imaging system because it is designed for a scanning type optical system.
▶Please position the incident pupil of the fθ lens beam into the scanning system (galvanometer mirror). If the incident pupil is not in position of the beam scanning system, the optimum focusing spot cannot be achieved because of increased aberration.

Outline Drawing
■fθ Lense

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■fθ Lense for YAG (fθ-L/fθ-B/fθ-270-1064)

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Schematic

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By using the f theta lens, it is possible to be moved a laser light spot in constant speed linear motion on the focal plane by scanning the mirrors such as galvanometer scanner mirrors. The f theta lens enables this by the effect of distortion. Mathematically it is expressed as following; focal length = “f”, ideal image height = “x”, the angle of scanned = “θ” therefore, x = fθ. In the normal single lens, the ideal image height “x” is represented by “x = f tanθ”. Characteristics of both are the same in a small angle range. However, the difference is greater angle increases.
Spec
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Part Number
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    JP Yen Stock Qty
fθ-100-266T
fθ-150-266T
fθ-100-355T
fθ-100-355THG
fθ-150-355T
fθ-100-532T
fθ-300-1064
fθ-100-1064T
fθ-100-532L
fθ-100-1064L
fθ-150-1064B
fθ-220-1064L
fθ-270-1064

266nm

100.4mm

φ12mm

±15°

φ52mm

135.9mm

0.93

60mm

57.8mm

43mm

5mm

6mm

6mm

φ97mm

φ82mm(g6)

M80P1

φ69mm

74.8mm

266nm

149.9mm

φ12mm

±15°

φ78mm

205.1mm

0.93

80mm

73.3mm

65mm

3mm

6mm

6mm

φ122mm

φ102mm(g6)

M100P1

φ89mm

88.3mm

355nm

99.85mm

φ12mm

±15°

φ52mm

136.1mm

0.93

60mm

56.3mm

42mm

6mm

6mm

6mm

φ97mm

φ82mm(g6)

M80P1

φ69mm

74.3mm

355nm

100.1mm

φ14mm

±15°

φ52mm

60.94mm

0.9

80mm

109.6mm

59mm

9mm

6mm

6mm

φ112mm

φ102mm(g6)

M100P1

φ84mm

130.6mm

355nm

150.2mm

φ12mm

±15°

φ78mm

207.2mm

0.93

80mm

72.3mm

64mm

4mm

6mm

6mm

φ122mm

φ102mm(g6)

M100P1

φ89mm

88.3mm

532nm

100.3mm

φ12mm

±15°

φ52mm

121.1mm

0.9

60mm

51.5mm

50mm

-

6mm

4mm

φ92mm

φ82mm(g6)

M80P1

-

61.5mm

1064nm

299.8mm

φ16mm

±23°

φ240mm

-

361.6mm

0.95

39mm

35.9mm

27.3mm

3.7mm

8mm

-

φ91mm

-

M80P1

φ76mm

47.6mm

1064nm

100.3mm

φ12mm

±15°

φ52mm

123.1mm

0.95

60mm

49.5mm

47.5mm

-

6.5mm

6mm

φ92mm

φ82mm(g6)

M80P1

-

62mm

532nm

100.2mm

φ12mm

±22.9°

φ80mm

-

114.7mm

0.95

53.3mm

17.8mm

22.5mm

22.8mm

8mm

φ89mm

φ80mm

φ72mm

φ60mm

48.6mm

φ83mm

1064nm

99.93mm

φ12mm

±22.9°

φ80mm

-

109.6mm

0.95

53.3mm

17mm

20mm

25.3mm

8mm

φ87mm

φ80mm

φ69mm

φ57mm

50.3mm

φ83mm

1064nm

152.1mm

φ15mm

±24.0°

φ127.4mm

-

168.6mm

0.95

63mm

19.8mm

26.8mm

28mm

8.2mm

φ87mm

φ80mm

φ74.5mm

φ64mm

56mm

φ86mm

1064nm

220mm

φ12mm

±24.0°

φ184mm

-

254.2mm

0.95

59.8mm

21.1mm

32.1mm

19.7mm

8mm

φ97mm

φ80mm

-

φ68mm

48.8mm

φ97mm

1064nm

273mm

φ15mm

±24.13°

φ230mm

-

318.9mm

0.95

59.7mm

33.5mm

26.0mm

24.7mm

9mm

φ106mm

φ74mm

-

φ64mm

67.2mm

φ106mm

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