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Magnescale BS78 Laserscale

Made in Japan
Manufacturer: Magnescale Co., Ltd.
Model: BS78

Features

  • High-resolution scale with signal pitch of approx. 138 nm, outperforming light wave interferometer systems
  • High stability, unaffected by humidity, air pressure and air disturbances
  • Reference point accuracy : ±0.1 µm
  • Scale accuracy : ±0.04 µm (measuring length : 40 mm)
  • Non-contact design eliminates return error.
  • Measuring length : 40 to 420 mm, 9 types (-R/-RS)
  • Measuring length : 10 to 420 mm, 10 types (-N/-NS)
  • Special non-magnetic and vacuum-compatible models available
  • Using low expansion glass : -0.7 x10-6 °C (measuring length : 10 to 420 mm)
  • Resolution : 2.1 pm

Specifications

BS78

Specifications
The Laserscale uses a semiconductor laser. The laser beam is harmful to the human body, so please do not look into the detection head section.
Model BS78
Measuring length 10 (only N/NS) / 40 / 70 / 120 / 170 / 220 / 270 / 320 / 370 / 420
Overall length 58 mm (L = 10 mm : open type scale), L +26 mm (L = 40 mm to 420 mm)
L : Measuring length
Max. travel L + 2 mm (L = 10 mm : open type scale), L +10 mm (L = 40 mm to 420 mm)
L: Measuring length
Scale accuracy (at 20 °C)
  • NS type, RS type :
  • ±0.03 µm (L = 10 mm : NS type)
  • ±0.04 µm (L = 40 mm)
  • ±0.10 µm (L = 70 / 120 mm)
  • ±0.18 µm (L = 170 / 220 mm)
  • ±0.25 µm (L = 270 mm)
  • ±0.34 µm (L = 320 mm)
  • ±0.39 µm (L = 370 mm)
  • ±0.44 µm (L = 420 mm)
  • L : Measuring length
  • N type, R type :
  • ±0.06 µm (L = 10 mm : N type)
  • ±0.08 µm (L = 40 mm)
  • ±0.20 µm (L = 70 / 120 mm)
  • ±0.35 µm (L = 170 / 220 mm)
  • ±0.50 µm (L = 270 / 370 mm)
  • ±0.65 µm (L = 420 mm)
  • L : Measuring length
Grating pitch Approx. 0.55 µm
Signal pitch Approx. 0.138 µm (Approx. 138 nm)
Reference point accuracy ±0.1 µm (Only R/RS type)
Reference point position At the center, and every 50 mm from the center to the left and
to the right (BS78 models with measuring lengths of 320, 370, 420 mm :
20 mm offset from the center at 50 mm intervals)
Reference point detection direction Single direction
Thermal expansion coefficient -0.7×10-6/℃
Light source Semiconductor laser : Wavelength 790 nm, Output 6 mW
Radiation power DHHS class 1
Detection principle Diffraction grating scanning system
Operating temperature +10 to +30 °C (no condensation)
Storage temperature -10 to 50 °C (humidity 60 % or less)
Max. response speed 400 mm/s

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