Ricoh Company, Ltd.

Junichi Yazawa

Yoshinori Hayashi

Seizo Suzuki

Masahiro Soeda

An optical scanning apparatus including a pulse modulation mechanism, a laser light source, a light deflecting mechanism, and a scan-imaging device. The pulse modulation mechanism performs a pulse modulation to input image data to output pulse-modulated image data. The laser light source generates a laser light beam according to the pulse-modulated image data. The laser light beam has a wavelength variation smaller than 2.0 nm per one pulse of the laser light beam. The light deflecting mechanism converts the laser light beam into a scanning laser light beam. The scan-imaging device condenses the scanning laser light beam into a scanning light spot on a surface to be scanned.

Method and apparatus for optical scanning capable of reducing a dot position displacement and a dot diameter variation

A small-size telescopic lens system with a brightness of 1:4, an angle of view of .+-.6.degree., and a telescopic ratio of about 0.8, which is constructed of front and back groups of lens elements, is disclosed. The first, second, third, fourth and fifth lens elements are aligned from the object side to the image side. The first, second and third lens elements make up the front group, while the fourth and fifth lens elements make up the back group. The first lens element is a biconvex lens, the second lens element is a biconcave lens, the third lens element is a convex meniscus lens which is convex towards the object, the fourth lens element is a biconcave lens, and the fifth lens element is a biconvex lens.

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Tokyo, Japan

Junichi Yazawa