US 5,295,004 A · Optical beam scanning apparatus

Abstract

An optical beam scanning apparatus includes one rotatable hologram which is rotatable about an axis, and at least two laser beam sources which emit laser beams. The rotatable hologram is provided with at least two hologram areas whose number corresponds to the number of the laser beam sources, so that the laser beams emitted from the respective laser beam sources are made incident upon the respective hologram areas. Each of the hologram areas is provided with a plurality of hologram facets which are concentrically arranged with respect to the axis of rotation of the rotatable hologram to emit laser beams of the same F number. The hologram areas having different numbers of hologram facets having different F numbers.

Claims18

Dependent claims

An optical beam scanning apparatus including one rotatable hologram which is rotatable about an axis, comprising:

at least two laser beam sources which emit respective laser beams;
said rotatable hologram having at least two hologram areas, the number of hologram areas corresponding to the number of laser beam sources and the respective laser beams emitted from the at least two laser beam sources being incident on the respective, at least two hologram areas, and
said at least two hologram areas, each having a plurality of hologram facets, being concentrically arranged with respect to the axis of rotation of the rotatable hologram thereby to emit the respective laser beams having the same F number;
and having respective, different numbers of hologram facets having respective, different F numbers.

1 more element

Dependencies are inferred from the claim text.

Optical beam scanning apparatus

Life of this patent

Optical beam scanning apparatus

Life of this patent

Abstract

Claims18