Holographic optical element, position shift detecting...

Details Holographic optical element, position shift detecting... Holographic optical element, position shift detecting...

2005-07-12

2005-07-12

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S566000, C369S112070, C369S112120

Reexamination Certificate

active

06917454

ABSTRACT:
In a holographic pattern provided in a holographic optical element, a pattern1atwists a diffracted light beam in a clockwise direction, to form a semi-circular light spot Sa on photodetection parts A and B so as to extend over a dividing line LX in a four-segment photodetection part. A pattern1bsimilarly twists the diffracted light beam in a clockwise direction, to form a semi-circular light spot Sb on photodetection parts C and D so as to extend over a dividing line LX in the four-segment photodetection part.

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