US3901598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for exposure of color calibrating film
Assignee: Agfa Gevaert AG
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Filing: 1974-04-26
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Granted: 1975-08-26
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Expires: 1994-04-26
Abstract
Abstract An arrangement for exposure of a color calibrating film by means of a gray wedge, including a source of light, a first fixed gray wedge, a second moveable gray wedge mounted in overlapping relationship with the first one, and a photosensitive medium.
Inventors
- 👤 Jacques Vanheerentals
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/727
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
250 words
An arrangement for producing a calibrating image upon a testexposure film specimen, comprising, in combination, holding means for holding in a predetermined plane a test-exposure film specimen upon which the calibrating image is to be formed; a first density wedge and a second density wedge each having a density which varies from approximately 0 percent to approximately 100 percent; mounting means mounting said density wedges for relative movement between a first stationary relative orientation in which the density of said first wedge increases along a first predetermined direction and the density of said second wedge increases along a second predetermined direction transverse to said first direction, and a second stationary relative orientation in which the density of said first wedge increases along said first predetermined direction and the density of said second wedge increases along a third predetermined direction opposite to said second direction; imageforming means operable when said wedges have said first stationary relative orientation for passing light of a first color through said wedges to form superimposed images of said wedges upon a test-exposure film specimen held in said plane, and operable when said wedges have said second stationary relative orientation for passing light of a different second color through said wedges to form superimposed images of said wedges upon such test-exposure film specimen; and drive means operable during a changeover of said image-forming means from said first to said second operating mode for effecting relative movement between said wedges from said first to said second relative orientation.
Claim 2
Dependent Claim
250 words
An arrangement for producing a calibrating image upon a testexposure film specimen, comprising, in combination, holding means for holding in a predetermined plane a test-exposure film specimen upon which the calibrating image is to be formed; a first density wedge and a second density wedge each having a density which varies from approximately 0 percent to approximately 100 percent; mounting means mounting said density wedges for relative movement between a first stationary relative orientation in which the density of said first wedge increases along a first predetermined direction and the density of said second wedge increases along a second predetermined direction transverse to said first direction, and a second stationary relative orientation in which the density of said first wedge increases along said first predetermined direction and the density of said second wedge increases along a third predetermined direction opposite to said second direction; imageforming means operable when said wedges have said first stationary relative orientation for passing light of a first color through said wedges to form superimposed images of said wedges upon a test-exposure film specimen held in said plane, and operable when said wedges have said second stationary relative orientation for passing light of a different second color through said wedges to form superimposed images of said wedges upon such test-exposure film specimen; and drive means operable during a changeover of said image-forming means from said first to said second operating mode for effecting relative movement between said wedges from said first to said second relative orientation.
Claim 3
Dependent Claim
79 words
An arrangement as defined in claim 1, wherein said second wedge is movably mounted, and wherein said first and second stationary relative orientations are such that upon a change from one to the other the 0 percent density portion of said second wedge moves to the location previously occupied by the 100 percent density portion thereof while the 100 percent density portion of said second wedge moves to the location previously occupied by the 0 percent density protion thereof.
Claim 4
Dependent Claim
29 words
An arrangment as defined in claim 2, wherein said second wedge is planar and is mounted for rotation about an axis normal to the plane of said second wedge.
Claim 5
Dependent Claim
16 words
An arrangement as defined in claim 2, wherein said second wedge is mounted for tilting movement.
Claim 6
Dependent Claim
85 words
An arrangement as defined in claim 2, wherein said second wedge is plAnar and is mounted on a support plate which is mounted for rotation about an axis normal to the plane of said second wedge and of said support plate, and wherein said drive means comprises a drive motor and forcetransmitting means engaging the rim of said support plate and operative for effecting rotation of said support plate upon a changeover from one to the other of said operating modes of said image-forming means.
Claim 7
Dependent Claim
87 words
An arrangement as defined in claim 5, wherein said drive means includes first stop means comprised of a moving part on said support plate and a stationary part and second stop means likewise comprised of a moving part and a stationary part, said parts of said first stop means being so positioned as to engage when said wedges assume said first stationary relative orientation, and said parts of said second stop means being so positioned as to engage when said wedges assume said second stationary relative orientation.
Claim 8
Dependent Claim
67 words
An arrangement as defined in claim 2, wherein said drive means includes a drive motor connected to said second wedge for moving the latter from a first to a second position respectively corresponding to said first and second stationary relative orientations, and motor control means operative for stopping movement of said second wedge when said second wedge arrives at either one of said first and second positions.
Claim 9
Dependent Claim
75 words
An arrangement as defined in claim 2, wherein said drive means includes a drive motor connected to said second wedge for moving the latter from a first to a second position respectively corresponding to said first and second stationary relative orientations, and motor control means operative for effecting reversal of the direction of movement of said second wedge in response to arrival by said second wedge at either one of said first and second positions.
Claim 10
Dependent Claim
77 words
An arrangement as defined in claim 3, the arrangement being provided in a reproduction camera provided with holding means for holding an original to be copied in a predetermined original plane and wherein said second wedge is located at least approximately in said original plane in both said stationary relative orientations but is mounted for swinging movement to swing out of the path of the light of said image-forming means, for normal use of the reproduction camera.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |