Compound objective lens having two focal points

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

1995-05-31

1998-09-29

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359569, 359570, 359721, 359743, 369103, 369112, 369 4423, G02B 532, G02B 310, G02B 308, G02B 700

Patent

active

058152938

ABSTRACT:
A compound objective lens is composed of a hologram lens or 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 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 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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