| 摘要 |
In an optical head, if a lens is reduced in size so that it can be integrated with a light source and a photodetector, other optical components as well as the lens must be reduced in size, which would result in greater difficulties in handling for assembly and adjustment purposes. The invention allows large quantities of ultra-small optical heads to be produced accurately and at low cost, the optical heads being easy to adjust and not requiring the handling of minute components for adjustment purposes. A first substrate includes lenses for focusing light on an information storage medium, a second substrate includes detectors and disposed on the surface thereof, and a layer, which is disposed between the first and second substrates, includes prisms and mirrors. The layer also includes cavities in which light sources are disposed. The individual substrates are formed in the form of wafers with the lenses, mirrors, prisms, light sources, and photodetectors disposed thereon.
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