Mechanism for scanning the inner periphery of a drum included in

Details Mechanism for scanning the inner periphery of a drum included in Mechanism for scanning the inner periphery of a drum included in

1995-08-28

1997-06-03

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359204, 359209, 359210, 359220, G02B 2608

Patent

active

056360495

ABSTRACT:
In an image forming apparatus, a mechanism for scanning the inner periphery of a hollow cylindrical drum has stationary optics including two semiconductor lasers fixed in place. The two lasers have their p-n junction planes positioned perpendicular to each other, i.e., one of them is horizontal while the other is vertical. Lights from the lasers are combined on the same axis by a polarizing beam splitter. A quarter-wave plate has its optical axis inclined .+-.45 degrees relative to the direction of polarization. The combined wave from the beam splitter is transformed by the quarter-wave plate to light having a clockwise and a counterclockwise polarization overlapping each other on the same axis. In the rotary optics, another quarter-wave plate converts the incident light to a composite wave of linear polarizations perpendicular to each other. This composite wave is incident to a splitting element as a P wave and an S wave or as ordinary rays and extraordinary rays. As a result, the P wave and S wave or the ordinary rays and extraordinary rays are spatially separated into two beams for scanning a film in parallel.

REFERENCES:
patent: 4637679 (1987-01-01), Funato
patent: 5420714 (1995-05-01), Zelenka
patent: 5481384 (1996-01-01), Kramer et al.

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