Laser unit

Abstract

The present invention provides a laser unit using a seal member whose central and peripheral portions will not affect each other to produce strain during mounting and which can be handled as a single component. In the laser unit 100 according to the present invention, a central portion 41 and a peripheral portion 42 of a seal member 40 used are separated from each other by slits 43. Therefore, when the seal member 40 is mounted, the central and peripheral portions will not affect each other to increase strain. In addition, because the central and peripheral portions are connected to each other at several points by bridging portions 44, the seal member 40 can be handled as a single component, which is very convenient.

What is claimed is:  
     
         1 . A laser unit comprising: 
 a lower housing;    a polygon motor secured to said lower housing;    a seal member having a central portion and a peripheral portion, said central portion being interposed between a motor mounting flange of said polygon motor and said lower housing, and said peripheral portion extending outside said motor mounting flange; and    a polygon cover for covering both said polygon mirror and said polygon motor, said polygon cover being secured at an edge portion thereof to said lower housing in such a manner that said peripheral portion of said seal member is interposed between the edge portion of said polygon cover and said lower housing;    wherein said seal member is provided with slits at appropriate positions between said central portion and said peripheral portion, said central portion and said peripheral portion being connected to each other by bridging portions formed between said slits.    
     
     
         2 . A laser unit according to  claim 1 , wherein said seal member is an elastic member.  
     
     
         3 . A laser unit according to  claim 1 , wherein said seal member is formed from rubber sponge.  
     
     
         4 . A laser unit according to  claim 3 , wherein said seal member has a density of 180±30 kg/m 3  and a hardness of 10±5°.  
     
     
         5 . A laser unit according to  claim 3 , wherein said seal member has double-sided adhesive tape for mounting applied to at least one side thereof.