Imaging system having a blurring optical element for minimizing moire phenomenon
First Claim
1. An imaging system for minimizing moire phenomenon comprising:
- an imaging lens unit for forming an image of an object at a predetermined imaging position, said imaging lens unit including an optical element on an optical path from a front end of said imaging lens unit to said predetermined imaging position;
one of an entrance face and an exit face of said optical element having a surface shape selected from a group consisting of a rotary cylindrical surface and a symmetric cylindrical surface which provides blurring exhibited in one of zonal and annular shapes with respect to said image of said object at said predetermined imaging position.
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Abstract
An image pickup device using a solid-state image sensor adapted to provide an optical component having a multiple curved surface, polyhedral surface, symmetric cylindrical surface, axially symmetric aspherical surface or asymmetric refracting surface in an objective lens system, or lengthen a shape of an image formed on an exit end face of an illuminating optical system in a direction parallel to a scanning direction of the solid-state image sensor, or select an angle made by a line segment connecting between the centers of individual exit end faces of two illuminating optical systems with the scanning direction of the solid-state image sensor to ±40° or less, or extend a shape of an aperture of a stop in a direction parallel to the scanning direction of the solid-state image sensor, in order to make it possible to fabricate the device in a small size and at a low cost and eliminate moire and false color without reducing resolving power.
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Citations
7 Claims
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1. An imaging system for minimizing moire phenomenon comprising:
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an imaging lens unit for forming an image of an object at a predetermined imaging position, said imaging lens unit including an optical element on an optical path from a front end of said imaging lens unit to said predetermined imaging position; one of an entrance face and an exit face of said optical element having a surface shape selected from a group consisting of a rotary cylindrical surface and a symmetric cylindrical surface which provides blurring exhibited in one of zonal and annular shapes with respect to said image of said object at said predetermined imaging position. - View Dependent Claims (2, 3, 4)
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5. An imaging system for minimizing moire phenomenon comprising:
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an image guide fiber bundle; an imaging lens unit for re-forming an image appearing at an end face of said image guide fiber bundle on a predetermined imaging position, said imaging lens unit including an optical element on an optical path from a front end of said imaging lens unit to said predetermined imaging position, one of an entrance face and an exit face of said optical element having a surface shape which provides blurring exhibited at one of zonal and annular shapes to the image re-formed on said predetermined imaging position; and a solid-state image sensor placed on said predetermined imaging position; wherein the condition;
space="preserve" listing-type="equation">Q.sub.1 ÷
1/2f.sub.Bis satisfied where Q1 represents a space between peaks of intensity of a point spread function, according to which said blurring is formed, in one of a horizontal direction and a vertical direction, and fB is a frequency of arrangement of fibers in the image appearing at said end face of said image guide fiber bundle which is re-formed on said image sensor through said imaging lens unit.
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6. An imaging system for minimizing moire phenomenon comprising:
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an imaging lens unit for forming an image of an object at a predetermined imaging position, said imaging lens unit including an optical element on an optical path from a front end of said imaging lens unit to said predetermined imaging position, one of an entrance face and an exit face of said optical element having a surface shape formed as a rotary cylindrical surface so as to provide blurring exhibited at one of zonal and annular shapes to the image of the object in said predetermined imaging position; and a solid-state image sensor disposed on said predetermined imaging position.
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7. An imaging system for minimizing moire phenomenon comprising:
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an imaging lens unit for forming an image of an object at a predetermined imaging position, said imaging lens unit including an optical element on an optical path from a front end of said imaging lens unit to said predetermined imaging position, one of an entrance face and an exit face of said optical element having a surface shape formed as a symmetric cylindrical surface so as to provide blurring exhibited at one of zonal and annular shapes to the image of the object in said predetermined imaging position; and a solid-state image sensor disposed on said predetermined imaging position.
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Specification