Optical head

Details Optical head Optical head

G - Physics

11

B

352/32.4

G11B 7/135 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01) G11B 11/105 (2006.01)

Patent

CA 2025311

An optical head for an optical disk recording/reproducing apparatus, which is capable of irradiating a recording medium by a light beam emitted from a light source and introducing an information light which is formed by the light beam reflected from the recording medium to a photo detecting system, while minimizing a shift of an optical axis of the information light. The optical head includes a unit for receiving the information light which is reflected from the recording medium, a first reflecting unit for reflecting the information light received by the receiving unit, a second reflecting unit for reflecting the information light reflected by the first reflecting unit and for directing the reflected information light toward the photo detecting system, and a unit for emerging the information light reflected by the second reflecting unit to the photo detecting system. The first reflecting unit has a surface for reflecting the information light thereby, and the second reflecting unit also has 2 surface for reflecting the reflected information light from the surface of the first reflecting unit. The surface of the first reflecting unit is substantially parallel to the surface of the second reflecting unit. The emerging surface has a surface for emerging the - 32 - information light reflected by the surface of the second reflecting unit. An angle between the surface of the receiving unit and the surface of the first reflecting unit substantially coincides with an angle between the surface of the second reflecting unit and the surface of the emerging unit.

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