US4575249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for measuring the density of color layers of printing inks that are still wet
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1983-03-23
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Granted: 1986-03-11
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Expires: 2003-03-23
Abstract
Abstract A method and device for measuring the density of color layers of printing inks that are still wet is provided in which a polarized light source is directed toward the color layer along an axis of illumination which is inclined at the Brewster angle relative to the surface normal line of the color layer.
Inventors
- 👤 Dieter Grieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:08
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474; G01N21/21
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A method for measuring the density of color layers of printing ink which is still wet, comprising the steps of: (1) illuminating the color layer with a light source along an optical axis at an angle of impingement, (2) polarizing the light from the light source so that the E-Vector of the light is parallel to the plane of impingement defined by the optical axis and the surface normal line of the color layer, and (3) arranging the light source so that the angle of impingement relative to the surface normal line of the color layer is approximately the Brewster angle of the printing ink.
Claim 2
Independent Claim
105 words
A method for measuring the density of color layers of printing ink which is still wet, comprising the steps of: (1) illuminating the color layer with a light source along an optical axis at an angle of impingement, (2) polarizing the light from the light source so that the E-Vector of the light is parallel to the plane of impingement defined by the optical axis and the surface normal line of the color layer, and (3) arranging the light source so that the angle of impingement relative to the surface normal line of the color layer is approximately the Brewster angle of the printing ink.
Claim 3
Dependent Claim
46 words
The method according to claim 1 in which the light source is arranged so that the angle of impingement relative to the surface normal line of the color layer is within a range of plus or minus 15% of the Brewster angle of the printing ink.
Claim 4
Dependent Claim
38 words
The method of claim 1 in which the light source is arranged so that the angle of impingement relative to the surface normal line of the color layer is exactly at the Brewster angle of the printing ink.
Claim 5
Independent Claim
119 words
A device for measuring the density of color layers of printing ink which is still wet comprising: a source of polarized light for illuminating the color layer along an optical axis at an angle of incidence, the oscillation direction of the E-Vector of said polarized light being parallel to the plane of impingement which is defined by said optical axis and the surface normal line of the color layer, the optical axis of illumination being inclined relative to the surface normal line of the color layer at approximately the Brewster angle of the printing ink color layer, and a photoelectric receiver for measuring the light reflected by the color layer and converting the measured light into an electrical signal.
Claim 6
Independent Claim
119 words
A device for measuring the density of color layers of printing ink which is still wet comprising: a source of polarized light for illuminating the color layer along an optical axis at an angle of incidence, the oscillation direction of the E-Vector of said polarized light being parallel to the plane of impingement which is defined by said optical axis and the surface normal line of the color layer, the optical axis of illumination being inclined relative to the surface normal line of the color layer at approximately the Brewster angle of the printing ink color layer, and a photoelectric receiver for measuring the light reflected by the color layer and converting the measured light into an electrical signal.
Claim 7
Dependent Claim
22 words
The device of claim 4 wherein the photoelectric receiver is disposed in the area of the normal line of the color layer.
Claim 8
Dependent Claim
45 words
The device of claim 4 wherein the optical axis of the illumination of the color layer is disposed in a range of plus or minus 15 percent around the Brewster angle of the printing ink relative to the surface normal line of the color layer.
Claim 9
Dependent Claim
22 words
The device of claim 6 wherein the photoelectric receiver is disposed in the area of the normal line of the color layer.
Claim 10
Dependent Claim
37 words
The device of claim 4 wherein the optical axis of the illumination of the color layer is disposed precisely at the Brewster angle of the printing ink relative to the surface normal line of the color layer.
Claim 11
Dependent Claim
22 words
The device of claim 8 wherein the photoelectric receiver is disposed in the area of the normal line of the color layer.
Claim 12
Dependent Claim
15 words
The device of claim 4 wherein said color layer is applied to a planar surface.
Claim 13
Dependent Claim
15 words
The device of claim 4 wherein said color layer is applied to a curvilinear surface.
Claim 14
Independent Claim
115 words
A device for measuring the density of color layers of printing ink which is still wet comprising: a source of polarized light for illuminating the color layer along an optical axis, the oscillation direction of the E-Vector of said polarized light being parallel to the plane of impingement which is defined by the optical axis and the surface normal line of the color layer, the optical axis of illumination being inclined relative to the surface normal line to the surface of the color layer at approximately the Brewster angle of the printing ink, and a photoelectric receiver for measuring the light reflected by the color layer and converting the measured light into an electrical signal.
Claim 15
Independent Claim
115 words
A device for measuring the density of color layers of printing ink which is still wet comprising: a source of polarized light for illuminating the color layer along an optical axis, the oscillation direction of the E-Vector of said polarized light being parallel to the plane of impingement which is defined by the optical axis and the surface normal line of the color layer, the optical axis of illumination being inclined relative to the surface normal line to the surface of the color layer at approximately the Brewster angle of the printing ink, and a photoelectric receiver for measuring the light reflected by the color layer and converting the measured light into an electrical signal.
References Cited (Backward Citations)
US3623818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |