Light beam scanning device

Details Light beam scanning device Light beam scanning device

1987-11-24

1989-04-04

Corbin, John K.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 61, 350 691, 250236, G02B 2610

Patent

active

048180467

ABSTRACT:
The invention provides a light beam scanning device in which an f-.theta. lens system is constituted by two single lenses, a cylindrical lens having a refractive power in only a deflection plane is located at the side of a deflective reflecting surface, and a toric lens including a surface having a negative refractive index at the side of the deflective reflecting surface and including a surface having a positive refractive power at the side of a surface to be scanned in a sectional plane perpendicular to the deflection plane is located at the output side of the cylindrical lens, thereby realizing scanning at a constant speed of an image-forming beam while preventing pitch variations in the beam and image surface curvature thereof on the surface to be scanned. More particularly, the invention provides a light beam scanning device in which a plastic lens can be used as the cylindrical lens.

REFERENCES:
patent: 4523801 (1985-06-01), Baba et al.
patent: 4707085 (1987-11-01), Takanashi et al.
patent: 4715699 (1987-12-01), Morimoto

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