Olympus Corporation

Isao Tsubouchi

Fumito Orii

Kazuya Hirose

Kenji Haga

Toru Takahashi

Katsuaki Yakata

A polygon mirror includes a mounting portion and a plurality of reflective surfaces. The mounting portion is mounted on a rotating body having a support surface. The mounting portion has the shape of a polygonal plate. The plurality of reflective surfaces are arranged around the rotating body so as to surround the rotating body. A plurality of protrusions configured to abut against the support surface of the rotating body are arranged on one side of the mounting portion.

Polygon mirror and polygon mirror device

A polygon mirror includes a reflective surface group having n number of reflective surfaces (M(), . . . , M(n)) formed individually as outer peripheral side faces, a flat portion which shuts one end portion of the reflective surface group, and n number of pin gate traces (L(), . . . , L(n)) which are provided on the flat portion, correspond to the n number of reflective surfaces, individually, and are kept individually at distances from edge portions at which the reflective surfaces cross the flat portion. There are conditions DM()&#x3e;DL()/, . . . , DM(n)&#x3e;DL(n)/and DM()&#x3e;DL(n)/, . . . , DM(n)&#x3e;DL(n&#x2212;1)/, where DM(n) is a shortest distance from an edge portion at which the reflective surface M(n) and the flat portion cross each other to the pin gate trace L(n) and DL(n) is a shortest distance between the pin gate trace L(n) and the pin gate trace L().

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Suwa, Japan

Isao Tsubouchi