Optical head

Details Optical head Optical head

G - Physics

11

B

88/99

G11B 7/12 (2006.01) G11B 7/09 (2006.01) G11B 7/135 (2006.01) G11B 7/125 (2006.01)

Patent

CA 1259216

ABSTRACT OF THE DISCLOSURE This invention uses a plate-like half mirror having a beam splitter function and a function for producing an astigmatism for detecting a focusing error, and an optical element for correcting a coma. Therefore, this invention can provide a low-cost, highly reliable optical head.

505750

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