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US 5,980,045 AGranted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazuo Fujibayashi
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes an illuminating device for illuminating a projection image. The illuminating device includes a light source having of a collector-mirror-incorporated lamp, an adapter lens capable of being mounted in or dismounted out of an optical path, and a field lens capable of moving on the optical axis. A projection lens projects the projection image under illumination of the illuminating device onto a projection surface.
Claims16
An image forming apparatus comprising:
- illuminating means for illuminating a projection image, said illuminating means having a light source comprised of a collector-mirror-incorporated lamp, an adapter lens capable of being mounted in or dismounted out of an optical path, and a field lens capable of moving on the optical axis;
- and
- a projection lens for projecting said projection image under illumination of said illuminating means onto a projection surface, wherein
- said adapter lens is mounted in or dismounted out of the optical path, depending upon projection magnification of said projections lens.
1 more element
An image forming apparatus comprising:
- illuminating means for illuminating a projection image, said illuminating means having a light source comprised of a collector-mirror-incorporated lamp, a fixed lens, an adapter lens capable of being mounted in or dismounted out of an optical path, and a field lens capable of moving on the optical axis;
- and
- a projection lens for projecting said projection image under illumination of said illuminating means onto a projection surface, wherein
- said adapter lens is mounted in or dismounted out of the optical path, depending upon a projection magnification of said projection lens.
1 more element
An image forming apparatus comprising:
- illuminating means for illuminating a projection image, said illuminating means having a light source comprised of a collector-mirror-incorporated lamp, a lens with variable refracting power, and a field lens capable of moving on the optical axis;
- and
- a projection lens for projecting said projection image under illumination of said illuminating means onto a projection surface.
Dependencies are inferred from the claim text.