Title:
DYNAMIC PRESSURE AIR BEARING TYPE POLYGON SCANNER
Document Type and Number:
Japanese Patent JPH0442118
Kind Code:
A
Abstract:
PURPOSE:To prevent a mirror presser from shifting in position owing to a rise in temperature resulting from continuous operation and unbalance quantity at the same time by setting the coefficient of linear expansion of a material which constitutes the mirror presser <=1.2 time as large as the coefficient of linear expansion of a material which constitutes a hollow rotary shaft. CONSTITUTION:For example, stainless steel, carbon steel, etc., are used as the material of the mirror presser 5 and its coefficient of linear expansion is set nearly equal to or less than, i.e. <=1.2 times as large as the coefficient of linear expansion of the material of the hollow rotary shaft 1. Then the hollow rotary shaft 1 is made of stainless steel, e.g. SUS420J2, so stainless steel or carbon steel whose linear expansion coefficient is nearly 1.2 time as large as that of said SUS420J2 is selected. Therefore, the applied pressure of thermal expansion due to the temperature rise resulting from the continuous operation is not generated and the mirror presser 5 is prevented from shifting radially. At the same time, the increase in the unbalance quantity of a rotary body 8 is eliminated and the rotary body 8 rotates extremely silently and smoothly.
Inventors:
ITAMI YUKIO
SUZUKI MITSUO
HASHIMOTO YOSHIO
SUZUKI MITSUO
HASHIMOTO YOSHIO
Application Number:
JP15067090A
Publication Date:
February 12, 1992
Filing Date:
June 07, 1990
Export Citation:
Assignee:
RICOH KK
International Classes:
G02B26/12; G02B26/10; (IPC1-7): G02B26/10
Attorney, Agent or Firm:
Gunichiro Ariga
Next Patent: BEAM DIAMETER CORRECTING OPTICAL ELEMENT