Back to results
US 4,540,250 AGranted
Image detecting device
AssigneeCanon Kabushiki Kaisha
InventorSusumu Seto
Life of this patent
Estimating the term…
Abstract
An image detecting device includes a lens system for imaging a given surface area of an object on the light-receiving surface of a photoreceptor such as a photosensitive drum, a solid state pickup element or the like, said lens system including at least one single lens for absorbing light in a wavelength range having high sensitivity from an optical system containing said photoreceptor, said lens system being adapted to compensate said optical system in color sensitivity.
Claims18
An image detecting device comprising:
- an illuminating system having an illuminating light source for illuminating a preselected area of an object;
- a photoreceptor for receiving an image of said preselected area of an object;
- and
- an imaging lens system disposed in the path of the image to be received by the photoreceptor, said system including at least one imaging lens made of an optical glass havng a wavelength selectivity to certain visible light wavelengths to which said photoreceptor is sensitive, wherein such selectivity results from an absorption of a predetermined portion of visible light wavelengths by said one imaging lens to compensate for the wavelength sensitivity of said photoreceptor and the spectral wavelength characteristics of said illuminating system, wherein said selectivity provides a detected image on the photoreceptor having a uniform density over the overall wavelength range.
1 more element
An optical system for a copying apparatus comprising:
- an illuminating system having an illuminating light source for illuminating a preselected area of a color original, a photoreceptor onto which said preselected area of the color original is imaged, and an imaging lens system disposed in the path of the image to be received by the photoreceptor, said system including at least one single lens made of optical glass, wherein said one lens absorbs a predetermined portion of light having visual wavelengths thereby defining a wavelength region to compensate for color sensitivity of said optical system including said photoreceptor and said illuminating system, and wherein said selectivity provides a detected image on the photoreceptor having a uniform density over the overall wavelength range.
Dependencies are inferred from the claim text.