Slit exposure projection device
AssigneeMinolta Camera Kabushiki Kaisha
InventorsMasami Tanaka, Toshihide Dohi
Life of this patent
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Abstract
Disclosed is a projection device for projecting an image of an original on an object plane to an image plane for use in copying machines, facsimiles, image readers and the like. The projection device comprises a roof mirror and an optical member including a plurality of lens elements linearly aligned in the longitudinal direction of the slit. Each of the lens elements has a refractive surface and a reflective surface in facing relation with each other. At least one of said surfaces is toric in order to form an erecting real image in the longitudinal direction of the slit and an inverted real image in the lateral direction thereof.
Claims19
A projection device for projecting an image of an original on an object plane to an image plane through slit exposure comprising:
- a roof mirror positioned between the object plane and the image plane and having a first mirror face opposed obliquely to the object plane and a second mirror face opposed obliquely to the image plane;
- and
- an optical member opposed to the roof mirror and including a plurality of lens elements linearly aligned in the longitudinal direction of the slit with blocking of the light between lens elements, said lens elements having a toric refractive surface on the side facing to the roof mirror and a reflective surface on the reverse side, wherein a ray of the image light from the object plane enters through the first mirror face of the roof mirror into the optical member and then emits from the optical member to arrive at the image plane through the second mirror face of the roof mirror.
A projection device for projecting an image of an original on an object plane to an image plane through slit exposure comprising:
- a roof mirror positioned between the object plane and the image plane and having a first mirror face opposed obliquely to the object plane and a second mirror face opposed obliquely to the image plane;
- and
- an optical member opposed to the roof mirror and including a plurality of lens elements linearly aligned in the longitudinal direction of the slit with blocking of the light between lens eIements, said lens elements having a first toric surface on the side facing to the roof mirror and a second toric surface on the reverse side, said first toric surface having a refractive power in the longitudinal direction of the slit, said second toric surface having a refractive power in the lateral direction of the slit and mirror property reflecting a ray of light from the first toric surface to the same,
- wherein a ray of the image light from the object plane enters through the first mirror face of the roof mirror into the optical member and then emits from the optical member to arrive at the image plane through the second mirror face of the roof mirror.
A projection device for projecting an image of an original on an object plane to an image plane through slit exposure comprising:
- a roof mirror positioned between the object plane and the image plane and having a first mirror face opposed obliquely to the object plane and a second mirror face opposed obliquely to the image plane;
- and
- an optical member opposed to the roof mirror and including a plurality of lens elements linearly aligned in the longitudinal direction of the slit with blocking of the light between lens elements, said lens elements having a toric reflective surface on the side facing to the roof mirror and a roof reflective surface with edge line extending in the lateral direction of the slit on the reverse side, wherein a ray of the image light from the object plane enters through the first mirror face of the roof mirror into the optical member and then emits from the optical member to arrive at the image plane through the second mirror face of the roof mirror.
Dependencies are inferred from the claim text.