Laser beam scanning apparatus for controlling diameter of light

Details Laser beam scanning apparatus for controlling diameter of light Laser beam scanning apparatus for controlling diameter of light

1994-04-26

1996-09-17

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359216, 359217, 347259, G02B 2608

Patent

active

055574491

ABSTRACT:
A laser beam scanning apparatus includes: a light source unit for emitting a collimated laser light beam; a rotary deflector unit for deflecting a laser light beam from the light source unit; a focusing unit for converting the deflected light beam into a convergent light beam, and for focusing the convergent light beam on a recording medium as a light spot, so that the focused light beam scans the recording medium in a main scanning direction when the rotary deflector unit is rotated; and a beam shape control unit for changing the sectional shape of a laser light beam emitted by the light source unit to a first sectional shape by restricting the laser light beam by using an opening of the beam shape control unit, the opening of the beam shape control unit having a predetermined sectional shape and dimensions, so that a diameter of the light spot on the recording medium is changed to a desired diameter.

REFERENCES:
patent: 4732485 (1988-03-01), Morita et al.
patent: 4999513 (1991-03-01), Ito et al.
patent: 5161047 (1992-11-01), Tomita et al.
patent: 5218415 (1993-06-01), Kawashima
patent: 5325122 (1994-06-01), Hattori et al.

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