US3825337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color balance display
Assignee: Xerox Corp
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Filing: 1973-01-11
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Granted: 1974-07-23
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Expires: 1993-01-11
Abstract
Abstract An apparatus in which the color relationship of a developability control system is displayed for indicating the balance thereof. The display apparatus is utilized in a multi-color electrophotographic printing machine and produces a visual indication of the color balance of copies being reproduced therein. A colored light ray is visible to the operator and functions as an indication of the color balance in the printing machine. When the colors of the copy are in balance, the operator will see a gray-black light. Adjustments are provided to vary the color balance; these adjustments, in turn, regulate the color of the light ray transmitted to the operator, thereby permitting the operator to visually note when the printing machine is producing copies having the requisite color balance. The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 F Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
256 words
A multi-color electrophotographic printing machine employing a plurality of developer mixes having differently colored toner particles therein, including: means for sensing the concentration of toner particles in each of the developer mixes and generating a plurality of electrical signals, each of the electrical signals being indicative of the sensed toner particle concentration in one of the developer mixes; means for generating a plurality of adjustable reference signals, each of the reference signals being indicative of the selected toner particle concentration within one of the developer mixes; means for comparing each of the electrical signals from said sensing means with the corresponding one of the reference signals from said generating means to produce an error signal indicative of the deviation therebetween; a plurality of disc members mounted rotatably on the printing machine and overlapping one another in a common region, said plurality of disc members being coupled to said generating means so as to rotate relative to one another an amount corresponding to the change in the reference signals relative to one another; and a light source mounted on the printing machine and transmitting a beam of light rays through the common overlapping region of said plurality of disc members, said plurality of disc members attenuating the wavelength bandwidth and energy content of the light rays passing through the common overlapping region as a function of the relative orientation of each of said disc members with respect to one another so as to display the relationship of each of the reference levels with respect to one another.
Claim 2
Dependent Claim
256 words
A multi-color electrophotographic printing machine employing a plurality of developer mixes having differently colored toner particles therein, including: means for sensing the concentration of toner particles in each of the developer mixes and generating a plurality of electrical signals, each of the electrical signals being indicative of the sensed toner particle concentration in one of the developer mixes; means for generating a plurality of adjustable reference signals, each of the reference signals being indicative of the selected toner particle concentration within one of the developer mixes; means for comparing each of the electrical signals from said sensing means with the corresponding one of the reference signals from said generating means to produce an error signal indicative of the deviation therebetween; a plurality of disc members mounted rotatably on the printing machine and overlapping one another in a common region, said plurality of disc members being coupled to said generating means so as to rotate relative to one another an amount corresponding to the change in the reference signals relative to one another; and a light source mounted on the printing machine and transmitting a beam of light rays through the common overlapping region of said plurality of disc members, said plurality of disc members attenuating the wavelength bandwidth and energy content of the light rays passing through the common overlapping region as a function of the relative orientation of each of said disc members with respect to one another so as to display the relationship of each of the reference levels with respect to one another.
Claim 3
Dependent Claim
36 words
A printing machine as recited in claim 1, wherein each of said plurality of disc members has a continuously varying thickness so that the energy content of the beam transmitted therethrough depends upon the region thereof.
Claim 4
Dependent Claim
33 words
A printing machine as recited in claim 2, wherein said beam generating means includes a light source arranged to project light rays through the common overlapping region of said plurality of disc members.
Claim 5
Dependent Claim
57 words
A printing machine as recited in claim 3, wherein said plurality of disc members include a yellow disc member, a magenta disc member, and a cyan disc member overlapping one another in the common region so that when a gray-black light ray is transmitted through the common overlapping region said control system is substantially in color balance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |