Compound objective lens having two focal points

Details Compound objective lens having two focal points Compound objective lens having two focal points

1994-02-01

1995-08-29

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

369 4423, 369 94, 369103, 369112, G02B 532, G11B 700

Patent

active

054465656

ABSTRACT:
A compound objective lens is composed of a hologram lens for transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the incident light to form a beam of first-order diffracted light, and an objective lens for converging the transmitted light to form a first converging spot on a front surface of a thin type of first information medium and converging the diffracted light to form a second converging spot on a front surface of a thick type of second information medium. Because the hologram lens selectively functions as a concave lens for the diffracted light, a curvature of the transmitted light differs from that of the diffracted light. Therefore, even though the first and second information mediums have different thicknesses, the transmitted light incident on a rear surface of the first information medium is converged on the its front surface, and the diffracted light incident on a rear surface of the second information medium is converged on the its front surface. That is, the compound objective lens has two focal points.

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