Optical scanner

Details Optical scanner Optical scanner

1991-11-14

1993-05-04

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, G02B 2608

Patent

active

052086941

ABSTRACT:
In an optical scanner, an image-forming optical system approximately sets the position of a deflecting/reflecting face of a rotary polygon mirror and the position of a scanned face in a conjugate relation in geometrical optics in a cross scan-corresponding direction. This optical system has a function for converging a deflected light beam onto the scanned face in a main scan-corresponding direction. The optical system is set such that the following condition, W.sub.0 /k.sub.2 <R/D<W.sub.0 /k.sub.1 is satisfied, where R designates a distance between the position of a real image and the position of an image of a light emitting section formed by an image-forming element between a laser diode light source and the scanned face; D designates a diameter of an opening image in the cross scan-corresponding direction with respect to the real image; W.sub.0 designates a waist diameter of the deflected light beam to be obtained between the real image position and the image position of the light emitting section; .lambda. designates a light emitting wavelength of the light source; a wavelength .lambda. is set to 780 nm; k.sub.1 is equal to 0.67.lambda./.lambda..sub. 0 ; and k.sub.2 is equal to 1.1.lambda./.lambda..sub.0.

REFERENCES:
patent: 4720632 (1988-01-01), Kaneko
patent: 4722581 (1988-02-01), Hamada et al.
patent: 5033806 (1991-07-01), Tomita et al.
patent: 5054866 (1991-10-01), Tomita et al.

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