Copying apparatus with focus-adjusting mechanism
First Claim
1. A copying machine comprising:
- (a) a rotatable photoconductive drum having a photoconductive surface;
(b) optical means, having a plurality of optical elements, for optically scanning an original such as a paper document to form an optical image corresponding to a document image and for forming the optical image on the photoconductive surface of said photoconductive drum, said optical means comprising, as said optical elements,lens means having an inherent focal length characteristic,first mirror means for introducing the optical image of the paper document to said lens means, andsecond mirror means for introducing the optical image from said lens means onto the photoconductive surface of said photoconductive drum, a relative positional relationship between said first and second mirror means having a variation caused by mass production even if the relative positional relationship is properly set in accordance with the inherent focal length characteristic; and
(c) focus adjusting means, including electrical devices manually operated by an operator and producing electrical digital distance data representing displacement determined by the operator, which is produced in accordance with the manual operation by the operator, for slightly moving at least one of said lens means, said first mirror means and said second mirror means in accordance with the electrical digital distance data so as to eliminate positional variations in said optical means, thereby compensating an out-of-focus state of the optical image on the photoconductive drum surface, said out-of-focus state being caused by the positional variations.
1 Assignment
0 Petitions
Accused Products
Abstract
A copying machine includes: a rotatable photoconductive drum and an optical assembly, having optical elements, for optically scanning a paper document, and forming an optical image corresponding to an optical document image on a photoconductive drum surface. The optical assembly includes: a lens; a first mirror section for introducing the image to the lens; and a second mirror section for introducing an optical image from the lens onto the drum. The position of the first mirror section relative to that of the second mirror section varies under mass production conditions although the relative positional relationship is preset in accordance with the inherent focal length of the lens. A focus adjusting device having DIP switches which are manually operated by an operator slightly moves the lens, the first mirror section and/or the second mirror section so as to eliminate positional errors in the optical assembly in accordance with the electrical data generated by the DIP switches, thereby compensating the out-of-focus state of the optical image on the drum surface.
7 Citations
12 Claims
-
1. A copying machine comprising:
-
(a) a rotatable photoconductive drum having a photoconductive surface; (b) optical means, having a plurality of optical elements, for optically scanning an original such as a paper document to form an optical image corresponding to a document image and for forming the optical image on the photoconductive surface of said photoconductive drum, said optical means comprising, as said optical elements, lens means having an inherent focal length characteristic, first mirror means for introducing the optical image of the paper document to said lens means, and second mirror means for introducing the optical image from said lens means onto the photoconductive surface of said photoconductive drum, a relative positional relationship between said first and second mirror means having a variation caused by mass production even if the relative positional relationship is properly set in accordance with the inherent focal length characteristic; and (c) focus adjusting means, including electrical devices manually operated by an operator and producing electrical digital distance data representing displacement determined by the operator, which is produced in accordance with the manual operation by the operator, for slightly moving at least one of said lens means, said first mirror means and said second mirror means in accordance with the electrical digital distance data so as to eliminate positional variations in said optical means, thereby compensating an out-of-focus state of the optical image on the photoconductive drum surface, said out-of-focus state being caused by the positional variations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification