Internal drum scanning type image recording apparatus
AssigneeDainippon Screen Manufacturing Co., Ltd.
InventorYoshiaki Morizumi
Life of this patent
Estimating the term…
Abstract
An image recording apparatus in which at least one light beam scans over an inner surface of a cylindrical member to record an image on a recording medium held on the inner surface. A light beam from light beam outputting means advances along a central axis of a cylindrical member and enters an optical head which includes deflecting means and an imaging optical system. The deflecting means and the imaging optical system rotate as one unit. The nodal point of the imaging optical system is located at or close to a point on the central axis which is nearest a beam irradiation position on the recording medium. Hence, displacement of the imaging position is prevented which makes it possible to record a high quality image, even if the optical head wobbles.
Claims19
An internal drum scanning type image recording apparatus for scanning at least one light beam over an inner surface of a cylindrical member and exposing a recording medium which is held on said inner surface to record an image on said recording medium, said cylindrical member having a central axis, said apparatus comprising:
- light beam outputting means for outputting a light beam along said central axis of said cylindrical member into the inner space of said cylindrical member;
- an optical head including deflecting means for deflecting said light beam from said light beam outputting means toward said inner surface of said cylindrical member and an imaging optical system for focusing said light beam from said light beam outputting means on said recording medium, said imaging optical system being disposed so that a nodal point of said imaging optical system is located at or close to a point on said central axis which is nearest a beam irradiation position on said recording medium, said imaging optical system and said deflecting means being disposed inside said cylindrical member in such a manner that said deflecting means and said imaging optical system are rotatable as one unit about said central axis;
- and
- optical head driving means for rotating said optical head about said central axis and scanning said light beam from said optical head over said recording medium.
Dependencies are inferred from the claim text.