Patent US5532848A successfully refreshed from Google Patents.
US5532848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for adjusting correlated color temperature
Assignee: Canon Inc
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Filing: 1992-11-25
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Granted: 1996-07-02
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Expires: 2012-11-25
Abstract
Abstract A color printing system includes a central processing unit for generating color image data, a color monitor for displaying color image data generated by the central processing unit and a color temperature sensing device for sensing color temperature of viewing light in which color images displayed on the monitor and color images printed by the printer are viewed. A first light source has a light output intensity controllable by the central processing unit. The central processing unit is adapted to control the intensity of the first light source in accordance with the color temperature sensed by the sensing device so as to match the color temperature sensed by the sensing device to a potential color temperature. Additionally, a second light source may be provided. The second light source has a different color temperature than the first light source and the central processor can adjust the intensity of the first and second light source based on relative color temperatures. The central processing unit is adapted to adjust the color temperature of either or both intensity of the first and second light sources.
Inventors
- 👤 Giordano B. Beretta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:23
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6083; H04N1/6088; H04N1/6011; H04N1/603; H04N1/6052
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
105 words
Apparatus for adjusting color temperature of viewing light to a white point of a color monitor, said apparatus comprising: a first light source whose color temperature is adjustable; means for measuring a color temperature of viewing light, the viewing light including ambient light and light output of said first light source; means for comparing the color temperature measured by said measuring means with the white point of the color monitor; and means for adjusting the color temperature of said first light source based on the comparison so that the color temperature of the viewing light is adjusted toward the white point of the color monitor.
Claim 2
Dependent Claim
105 words
Apparatus for adjusting color temperature of viewing light to a white point of a color monitor, said apparatus comprising: a first light source whose color temperature is adjustable; means for measuring a color temperature of viewing light, the viewing light including ambient light and light output of said first light source; means for comparing the color temperature measured by said measuring means with the white point of the color monitor; and means for adjusting the color temperature of said first light source based on the comparison so that the color temperature of the viewing light is adjusted toward the white point of the color monitor.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1, further comprising a second light source whose color temperature is adjustable, said second light source having a color temperature different from the color temperature of said first light source.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 2, wherein said adjusting means adjusts said first light source and said second light source based on a predetermined correlated color temperature of viewing light.
Claim 5
Dependent Claim
73 words
Apparatus according to claim 2, wherein the color temperature of said second light source is higher than the color temperature of said first light source, and wherein said adjusting means is adapted to increase the intensity of said second light source when the color temperature measured by said measuring means is low and to increase the intensity of said first light source when the color temperature measured by said measuring means is high.
Claim 6
Dependent Claim
19 words
Apparatus according to claim 1, wherein said first light source includes a controllable dimmer controllable by said adjusting means.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 1, further comprising means for setting the pre-designated color temperature.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 6, wherein said means for setting includes means for measuring the color temperature of a color monitor and wherein said pre-designated temperature is set to the color temperature of said color monitor.
Claim 9
Dependent Claim
173 words
A color printing system for adjusting a color temperature of viewing light to a white point of a color monitor, said color printing system comprising: a central processing unit for generating color image data; a first light source having a color temperature controllable by said central processing unit; a color monitor for displaying color image data generated by said central processing unit; a color printer for printing color image data generated by said central processing unit; a color temperature sensing device for sensing color temperature of viewing light which includes ambient light and light output of the first light source and in which color images displayed on said color monitor and color images printed by said color printer are viewed; wherein said central processing unit is adapted to control the color temperature of said first light source in accordance with the color temperature of the viewing light sensed by said color temperature sensing device so as to match the color temperature of the viewing light to the white point of the color monitor.
Claim 10
Dependent Claim
173 words
A color printing system for adjusting a color temperature of viewing light to a white point of a color monitor, said color printing system comprising: a central processing unit for generating color image data; a first light source having a color temperature controllable by said central processing unit; a color monitor for displaying color image data generated by said central processing unit; a color printer for printing color image data generated by said central processing unit; a color temperature sensing device for sensing color temperature of viewing light which includes ambient light and light output of the first light source and in which color images displayed on said color monitor and color images printed by said color printer are viewed; wherein said central processing unit is adapted to control the color temperature of said first light source in accordance with the color temperature of the viewing light sensed by said color temperature sensing device so as to match the color temperature of the viewing light to the white point of the color monitor.
Claim 11
Dependent Claim
65 words
A color printing system according to claim 8, further comprising a second color sensing device for sensing the color temperature of said color monitor, wherein said central processing unit is adapted to set the predetermined color temperature to the color temperature sensed by said second color sensing device whereby color temperature of the viewing light is matched to the color temperature of the color monitor.
Claim 12
Dependent Claim
37 words
A color printing system according to claim 8, further comprising a second light source whose color temperature is controllable, said second light source having a color temperature different from the color temperature of said first light source.
Claim 13
Dependent Claim
36 words
A color printing system according to claim 10, wherein said central processing unit is adapted to adjust said first light source and said second light source based on a predetermined correlated color temperature of viewing light.
Claim 14
Dependent Claim
81 words
A color printing system according to claim 10, wherein the color temperature of said second light source is higher than the color temperature of said first light source, and wherein said central processing unit is adapted to increase the intensity of said second light source when the color temperature measured by said color temperature sensing device is low and to increase the intensity of said first light source when the color temperature measured by said color temperature sensing device is high.
Claim 15
Dependent Claim
52 words
A color printing system according to claim 8, wherein said central processing unit is adapted to control both the intensity of said first light source and said color monitor in accordance with the color temperature sensed by said sensing device so as to adjust the color temperature to a predetermined color temperature.
Claim 16
Dependent Claim
51 words
A color printing system according to claim 8, further comprising a color sensing device for sensing the color temperature of said color monitor wherein said central processing unit is adapted to adjust an output color image of the color printer so as to match the color temperature of the color monitor.
Claim 17
Dependent Claim
23 words
A color printing system according to claim 8, wherein said first light source includes a controllable dimmer controllable by the central processing unit.
Claim 18
Independent Claim
101 words
A method for adjusting color temperature viewing light to a white point of a color monitor, said method comprising the steps of: measuring a color temperature of viewing light, the viewing light including ambient light and light output of a first light source; comparing the color temperature of the viewing light measured in the measuring step with the white point of the color monitor; and adjusting the color temperature of the first light source based on the comparison in the comparison step so that the color temperature of the viewing light is adjusted toward the white point of the color monitor.
Claim 19
Independent Claim
101 words
A method for adjusting color temperature viewing light to a white point of a color monitor, said method comprising the steps of: measuring a color temperature of viewing light, the viewing light including ambient light and light output of a first light source; comparing the color temperature of the viewing light measured in the measuring step with the white point of the color monitor; and adjusting the color temperature of the first light source based on the comparison in the comparison step so that the color temperature of the viewing light is adjusted toward the white point of the color monitor.
Claim 20
Dependent Claim
38 words
A method according to claim 16, further comprising the step of adjusting a color temperature of a second light source, said second light source having a color temperature different from the color temperature of the first light source.
Claim 21
Dependent Claim
35 words
A method according to claim 17, wherein the step of adjusting the first light source and the step of adjusting the second light source are based on a predetermined correlated color temperature of viewing light.
Claim 22
Dependent Claim
162 words
A color printing method for printing color images displayed on a color monitor, and for adjusting a color temperature of viewing light to a white point of the color monitor so that the printed color images are not perceptually different from the displayed color images, said color printing method comprising the steps of: displaying a color image on a color monitor; printing the color image displayed on the color monitor; sensing a color temperature of viewing light, the viewing light including ambient light and light output of a first light source, and said viewing light being used to view the color image displayed in the displaying step and to view the color image printed in the printing step; and controlling the color temperature of the first light source in accordance with the color temperature of the viewing light sensed in the sensing step so as to match the color temperature of the viewing light to the white point of the color monitor.
Claim 23
Dependent Claim
162 words
A color printing method for printing color images displayed on a color monitor, and for adjusting a color temperature of viewing light to a white point of the color monitor so that the printed color images are not perceptually different from the displayed color images, said color printing method comprising the steps of: displaying a color image on a color monitor; printing the color image displayed on the color monitor; sensing a color temperature of viewing light, the viewing light including ambient light and light output of a first light source, and said viewing light being used to view the color image displayed in the displaying step and to view the color image printed in the printing step; and controlling the color temperature of the first light source in accordance with the color temperature of the viewing light sensed in the sensing step so as to match the color temperature of the viewing light to the white point of the color monitor.
Claim 24
Dependent Claim
34 words
A method according to claim 19, further comprising the step of controlling a second light source, said second light source having a color temperature different from the color temperature of the first light source.
Claim 25
Dependent Claim
35 words
A method according to claim 20, wherein the step of controlling the first light source and the step of controlling the second light source are based on a predetermined correlated color temperature of viewing light.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |