Infrared Twin Beam Laser Diode with Excellent Temperature Characteristics

ROHM has announced the development of the RLD2BPNK3, a twin beam infrared laser diode specifically designed for laser printers featuring a narrow light emission point interval (28µm) and excellent temperature characteristics that minimizes the thermal effects from adjacent resistive elements.

To meet the demand for faster printing, laser printers are increasingly utilizing dual- and quad-beam laser diodes which enable printing speeds 2 and 4 times faster than conventional single-beam units. A narrow laser emission point interval (30µm) is required for high resolution printing. The narrower the emission point interval, the greater the susceptibility of a given resistive element to heat generated by an adjacent element making it difficult to achieve stable characteristics.

The RLD2BPNK3 overcomes these obstacles by dramatically reducing carrier overflow from the active layer at high temperatures through utilization of a unique structure. The result is excellent temperature characteristics – operating current increases by only 6% at 6mW when Tc (case temperature) changes from 25ºC to 60ºC. This is in contrast to a 33% increase in competitor products.
Thermal crosstalk and droop characteristics at high temperatures are also markedly improved over conventional units, making it ideal for high resolution, high speed laser printers.

•Main Specifications

•Temperature Characteristics

Narrow Pitch Twin Beam Infrared Laser Diodes for Laser Printers (PDF:176KB)

■Glossary

• Droop characteristics
  Due to thermal factors there is a difference in laser beam output between short and long drive times. This difference is called droop. It affects the print density during recording, making it an important parameter.

	Laser Diodes