Optical pickup and an optical pickup objective lense assembling

Details Optical pickup and an optical pickup objective lense assembling Optical pickup and an optical pickup objective lense assembling

1998-03-05

2000-04-25

Epps, Georgia

Optical: systems and elements

Lens

Microscope objective

359667, 359717, 359793, 359819, 359821, G02B 702

Patent

active

060551135

ABSTRACT:
This invention intends to provide an optical pickup of which it is possible to limit aberrations within a tolerable limit without incorporating a special device for that purpose even if errors arise in thickness of component lenses of a two-lens system constituting an element of the pickup. This object is achieved by providing an optical pickup incorporating a two-lens system with first and second lenses 13 and 14 being arranged in the following manner: the first lens has a first surface 15 to receive a laser beam radiated from a semiconductor laser and a second surface 16 to direct the laser beam transmitted from the first surface 15 towards the second lens 14; the second lens 14 has a third surface 17 to receive the light flux transmitted from the second surface 16 and a fourth surface 18 to direct the light flux transmitted from the third surface 17 towards an optical disc placed opposite thereto; and the first and fourth surfaces are used as a reference during positioning.

REFERENCES:
patent: 2161368 (1939-06-01), McLeod
patent: 4662717 (1987-05-01), Yamada et al.
patent: 4953959 (1990-09-01), Ishiwata et al.
patent: 5467225 (1995-11-01), Manabe

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