Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Reexamination Certificate
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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Matsumoto Mitsuaki
Mori Kazushi
Sawada Minoru
Tajiri Atsushi
Tominaga Koji
Boutsikaris Leonidas
Sanyo Electric Co,. Ltd.
Westerman Hattori Daniels & Adrian LLP
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