| 摘要 |
PURPOSE:To improve the workability of the fabrication of the laser unit and to make the device compact, by hermetically sealing only a semiconductor laser part in the laser unit which is used in a recording device such as a laser beam printer. CONSTITUTION:The semiconductor laser 18 in the laser unit is bonded and fixed to a mount 21 in a space 20 within a small package 19 wherein dry nitrogen is sealed. Light generated in the laser 18 is emitted through a glass window 22. A hole in the lower surface of the package 19, through which terminals 24 from the laser 18 pass, is perfectly sealed by a sealing agent so that the dry nitrogen in the package 19 does not escape to the outside and moisture does not enter from the outside. Said package 19 is fixed to a temperature controlling Peltier element 25 by a heat conductive bonding agent. The Peltier element 25 is fixed to a heat radiating fin 26 by the same manner. Since the dry nitrogen is sealed only in the inside of the package 19, the devise can be made compact. Since the laser unit can be fabricated under the state the semiconductor laser 18 is enclosed in the package 19, the working time can be shortened. |
