Optical: systems and elements – Lens – With support
Patent
1999-04-13
2000-10-10
Mack, Ricky
Optical: systems and elements
Lens
With support
359823, G02B 702
Patent
active
061307890
ABSTRACT:
An optical scanning device includes an optical lens system for focusing a light beam into a scanning spot on an information carrier. The lens system includes a housing containing a main or objective lens and an auxiliary or solid immersion lens with a ring-shaped holder. The lens combination provides a large numerical aperture, so that the scanning device is suitable for scanning information carriers with a high information density, such as high-density compact discs. The lens system also includes an actuator for displacing the lens system and for displacing the auxiliary lens with respect to the main lens in a direction parallel to an optical axis of the lens system for compensating for spherical aberration in a transparent protection layer of the information carrier. The actuator includes a ring-shaped magnetic closing yoke which is secured to a housing and includes two ring-shaped permanent magnets which, viewed parallel to the optical axis, are secured next to one another to the closing yolk. The magnets are magnetised in mutually opposite radial directions relative to the optical axis. The actuator also includes two ring-shaped electric coils, which are secured to a ring-shaped holder of the auxiliary lens. The coils are arranged, viewed parallel to the optical axis, next to one another and opposite the two magnets, and the coils are wound in mutually opposite directions. In this manner, the actuator of the lens system has a favorable ratio between its dimensions and its electromagnetic force, so that the dimensions and weight of the actuator necessary for obtaining a predetermined electromagnetic force can be limited.
REFERENCES:
patent: 4306206 (1981-12-01), Myers
patent: 5712842 (1998-01-01), Yamamoto et al.
Aarts Jan W.
Baartman Jan P.
Belk Michael E.
Mack Ricky
U.S. Philips Corporation
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