Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-01-05
2009-10-13
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C369S112230
Reexamination Certificate
active
07602561
ABSTRACT:
Disclosed is an optical head apparatus comprising: a light source; a collimating means of converting a beam of light emitted from the light source into a substantially parallel beam of light; a focusing means of focusing the light onto an information medium surface; a beam splitting means of splitting the beam of light modulated by the information medium; and a light receiving means of receiving the light modulated by the information medium, wherein a lens having a negative power and a lens having a positive power are arranged in this order as viewed from the collimating means side between the collimating means and the focusing means, and at least either one of the lenses is moved along an optical axis to correct spherical aberration occurring on the information medium surface, and wherein the distance from the lens having the positive power to the focusing means is set substantially equal to the focal length of the lens having the positive power.
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International Search Report corresponding to application No. PCT/JP02/08051 dated Oct. 8, 2002.
Ogata Daisuke
Sasano Tomohiko
Tanaka Yasuhiro
Yamagata Michihiro
Panasonic Corporation
RatnerPrestia
Sugarman Scott J
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