摘要:
An optical scanning apparatus in which a plurality of scanning light beams are deflected by a light deflector and the deflected light beams impinge onto a spherical lens having an f-.theta. characteristic at inclinations with respect to the optical axis of the lens so as to be focused on a scanning object. The apparatus is arranged to meet the following condition: ##EQU1## where, f represents the focal distance of the spherical lens (mm), .omega. represents the effective scanning rotation angle of the light deflector (deg), .DELTA.(.omega.) represents the amount of curve of the scanning line caused by the light deflecting element in the subscanning direction (mm), .rho. represents the resolution of the scan on the scanning object (lines/mm), .theta. represents the angle of inclination of any one of the light beams with respect to the optical axis of the lens within a plane which contains the optical axis of the lens and which is perpendicular to the scanning axis (deg), L represents the distance between the first reflection surface of the light deflector and the principal plane of the lens adjacent the scanning object along the optical axis (mm), and h represents the height of incidence of the any one of the light beams to the lens (mm).
摘要:
In an apparatus including a unit which is recoverable and reusable after use, an environmental history indicator member having a property variable according to an environmental history of use of the apparatus and arranged not to participate in any functions of the apparatus during use of the apparatus is disposed inside the unit or adjacent to the unit. By checking the state of the environmental history indicator member when the unit is recovered from the apparatus after the end of service of the apparatus, a management system for reuse is arranged to easily and efficiently decide the unit to be reusable or no longer usable.
摘要:
An LED printer head capable of reducing influence of a sub emission band by use of a rod lens array and thus prevent light of the sub emission band from reaching a development level. The LED printer head consists of an LED array of LEDs to emit light according to an image signal, which are arrayed at the resolution pitch P of not less than 600 dpi, and a multi-lens array for forming an emission image of the LED array on a photosensitive body. Each of the LEDs of the LED array has a main emission band of an emission spectrum and another sub emission band having a peak level of not less than 0.01 as a photosensitive intensity ratio R to the main emission spectrum, and a difference D between best total conjugate lengths at peak wavelengths of the main and sub emission bands by the multi-lens array is at least 0.15. Optical adjustment of the LED array and the multi-lens array is effected so that light of the main emission band is focused in a predetermined imaging relation on the predetermined photosensitive body.
摘要:
An Optical filter is provided on a light receiving surface of an image sensor. The filter has a plurality of thin layers alternately laminated. The thin layers alternately consist of a dielectric layer having a high refractive index and a metal layer and each thin layer has its stress .sigma. in a range -5 GPa.ltoreq..sigma.
摘要:
In an image reading apparatus, a first object and a second object are adapted to be illuminated on different regions each other with a light beam from a light source by an illuminating device. A first imaging optical system is provided to image image information of the first object on a single photoelectric converting device. A second imaging optical system is provided in an optical path different from that of the first imaging optical system so as to image image information of the second object onto the photoelectric converting device. The first and second object to be illuminated, and the photoelectric converting device are relatively displaced to read the image information of the first and second objects.
摘要:
A laminate-type diffractive optical element which is easily producible and which allows high optical performance to be easily achieved, and an optical system using the same, are disclosed. In the diffractive optical element formed by laminating a plurality of diffraction gratings, when the distance between the uppermost portion of one diffraction grating and the lowermost portion of the other diffraction grating in two diffraction gratings adjacent to each other along the incident direction of a light is represented by D (&mgr;m), these two diffraction gratings are arranged to satisfy the following relation: 10 &mgr;m
摘要:
A device for illuminating an original for use in an original reading apparatus for reading an original placed on an original supporting table has a light source having a filament having its lengthwise direction disposed so as to be perpendicular to a reading line.
摘要:
An image reading lens that is constructed of, in succession from the object side, a stop, a meniscus-shaped positive first lens having its convex surface at the image plane side, and a negative second lens having its concave surface at the image plane side. Both the lens surfaces of the first lens and at least one lens surface of the second lens are constructed of an aspherical surface. The shape of the object side aspherical surface of the first lens is formed so as to be inside a reference spherical surface.
摘要:
An object of the present invention is to efficiently shape a light flux emitted from a light source into a linear shape and so as to provide an optical element having high versatility that can be widely used irrespective of the original sizes and to provide an illumination apparatus having such an illumination apparatus. The optical element has a reflection surface in the form of an inner side of a curved surface that is formed by rotating a parabola about a rotation axis including the focus of the parabola or a point near the focus of the parabola.
摘要:
A zoom lens comprises, from the object side to the image side, a first lens group, a second lens group, and a rear group including one or more lens groups, where the first and second lens groups can move at the time of zooming, and wherein the first lens group comprises, from the object side to the image side, a first lens of negative refractive power, and a second lens of positive refractive power.