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Low Cost Resonant Scanner

Features and Advantages

  • ONE FIXED FREQUENCY from the range of 10 Hz to 1,500 Hz
  • Scan angle up to 60° peak-to-peak optical
  • Mirror size up to 25x25mm
  • Vertical or horizontal mounting
  • Small size and lightweight
  • Low power drive electronics
  • Rugged, no wearing parts
  • Maintenance free
  • High reliability
  • Withstands shock and vibration
  • High frequency stability (to 0.005%)
  • High/low temperature operation1
  • Vacuum operation (to 10-10 Torr)1
  • Jitter free operation
  • No radiated electromagnetic interference (EMI)
  • Mirror position output available
  • Glass mirrors with enhanced aluminum coating are standard, coating for IR and UV optional1
1 Available on special order
  • Description
  • Drawings
  • Documents

The SC-20 type scanners are low cost compact size components especially suited for high volume OEM and for custom industrial applications.

The fixed frequency resonant optical scanner is an electromagnetically driven moving mirror device, which deflects a light beam with a sinusoidal motion. The mirror assembly is attached at the center of a spring. The scanning frequency range of the SC-20 type scanner is from 10 Hz to 1.5 KHz, fixed at any one value within the range. The scan angle is inversely proportional to the frequency, and is a function of the mirror size.

High device "Q" insures frequency stability, low reaction forces and low electrical drive power. High flexural stiffness provides good resistance to shock and vibration, as well as low wobble and good scan repeatability. Resonating at the natural frequency makes the device an excellent candidate for long life operation for a multitude of applications that require good imaging with minimal distortion. The scanners can easily be incorporated in small size and portable instruments. The scanners require only minimal power. Since they are components that have no wearing parts, they provide excellent repeatability and long life.

Glass mirrors are standard. Metal mirrors, gratings, lenses, optical attachments and special configurations are available as a special order.

Drive electronics with different packaging, regulation and power supply options are available. For large volume OEM manufacturing we would consider providing free information to build your driver, incorporate it within your drive electronics or build it to your desired size.
Special pricing for OEM applications.

Operation at resonant frequency is sustained by a feedback amplifier type ED driver or the AGC driver, using the scanner as a frequency source. The AGC driver also provides a higher amplitude stability (0.01%) and a position output signal. The PLD-1S driver will phase lock the scanner to an external clock signal. The PLD-2S driver will phase lock two scanners as a "master/slave" scanning system and the PLD-2SXY driver will phase lock two scanners as an "X-Y" scanning system.

ONE FIXED FREQUENCY from the range of 10 to 1,500 Hz. The following should serve as guidelines only.


SCAN ANGLE (P-P deg opt)MIRROR SIZE (mm)FREQ. (Hz +/-10%)

Size: to 25x25mm, as a function of frequency; larger size available
Thickness: 1.0mm, standard; other thickness values available
Flatness: 1/4, 1/2 and 1 wavelength as a function of size
Surface quality: scratch and dig: 60-40

Drive coil resistance: 50, 150, 400, 950 and 2000 ohms as a function of frequency
Sense coil resistance: 950 ohms
Connector: female 4 pin plug on 0.1-inch centers, Molex P/N 22-01-3047 or equiv.
Scan frequency range: 5 Hz to 1.5 KHz
Frequency accuracy: +/-2% at 25°C, closer accuracy available upon request
Scan angle: to 60° peak to peak optical as a function of frequency and mirror size

TYPE [SC-20]; MIRROR SIZE [mm]; ANGLE [P-P Deg. optical]; FREQUENCY [Hz]
Example: PART NO. SC20-25×25-60-32. This part number specifies the model SC-20 scanner, a 25mm square mirror, a 60° peak to peak optical scan angle and a 32 Hz operating frequency.