2-laser optical head and recording/reproducing apparatus

A two-laser optical head comprising:

• a first optical system for emitting a first laser beam having a first wave length (.lambda..sub.1), said first laser beam irradiates an information recording medium and reflected thereon to be detected by first detecting means, said first optical system reproduces an information signal on said medium;
• a second optical system for emitting a second laser beam having a second wave length (.lambda..sub.2), said second laser beam irradiates an information recording medium and reflected thereon to be detected by second detecting means, said second optical system at least erases and records an information signal on said medium;
• a first beam splitter for separating and combining said first optical system and said second optical system, said first laser beam passes through said first beam splitter and said second laser beam is reflected by said first beam splitter;
• an objective lens for converging said first laser beam and said second laser beam onto said information recording medium to form a first spot and a second spot, respectively;
• and
• a second beam splitter disposed on a beam path between a beam source and said first beam splitter in said first optical system said second beam splitter corrects phase difference in said first laser beam caused by said first beam splitter.
• wherein said first laser beam passes through said second beam splitter and thereafter passes through said first beam splitter twice and thereafter is reflected by said second beam splitter to be led to said first detecting means.