Prism-type objective lens for the pickup head of an optical disc

Details Prism-type objective lens for the pickup head of an optical disc Prism-type objective lens for the pickup head of an optical disc

1998-06-11

2000-03-07

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359833, 359645, 369112, 369 4437, G02B 532, G02B 504, G11B 700

Patent

active

06034797&

ABSTRACT:
A prism-type objective lens is provided for use in the pickup head of an optical disc drive capable of driving two types of optical discs such as a CD and a DVD. The prism-type objective lens allows the pickup head to be made more compact in size with reduced structural complexity, and also allows the pickup head to read data from two different types of optical discs. The prism-type objective lens includes a prism having a cross section substantially in the shape of a right triangle, a front aspherical plano-convex lens, and a rear aspherical plano-convex lens, where the planar surface of each lens is attached to one or the other of the leg sides of the prism. The hypotenuse side of the prism can be formed with two aperture areas where different reflective layers are coated. Alternatively, the hypotenuse side of the prism can be formed with a reflective HOE layer that allows the laser beam incident on it and reflected from it to be diffracted into two beams which are focused at different points. Either manner allows the pickup head to read data from two different types of optical discs.

REFERENCES:
patent: 5206675 (1993-04-01), Miyauchi et al.

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