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US 5,400,115 AGranted
Printer having a measuring unit adjustable to the spectral sensitivity of a copy material
AssigneeAgfa-Gevaert
InventorReimund Muench
Life of this patent
Estimating the term…
Abstract
A printer has a light source and an objective which direct a light beam along a predetermined path, and a unit in the path for measuring the density of a master to be reproduced. The measuring unit includes a filter combination of at least two filters downstream of the objective and a light sensor downstream of the filter combination. The filter combination has a transmission pattern which shifts as the angle of incidence of the light beam on one or more of the filters changes. At least one of the filters is pivotable in order to vary the angle of incidence of the light beam on the same. This allows the transmission pattern to be shifted so as to adjust the measuring unit to the spectral sensitivity of the copy material used for reproduction of the master.
Claims30
A method of printing a master on copy material having a predetermined spectral sensitivity, comprising the steps of:
- providing a source of radiation;
- measuring the density of said master using measuring means which includes a plurality of measuring elements transparent to the radiation, said measuring means having a transmission pattern with an ascending leg and a descending leg which shifts in dependence upon the angle of incidence of radiation on said elements;
- and
- adjusting said measuring means to said predetermined spectral sensitivity, the adjusting step including moving at least one of said elements independently of another of said elements so as to change the angle of incidence of radiation on said one element, which move results in the shifting of the ascending leg of the pattern differently from the descending leg.
1 more element
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of radiation on said elements, said elements including a first element which affects the increasing edge of the transmission pattern and a second element which affects the decreasing edge of the transmission pattern;
- and
- means for moving each of said first and second elements independently of each other to change the angle of incidence of the radiation on each of said first and second elements.
1 more element
A method of printing a master on copy material having a predetermined spectral sensitivity comprising the steps of:
- providing a source of radiation;
- measuring the density of said master using measuring means which includes a plurality of measuring elements transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements, at least one of said elements having a transmission pattern which includes an ascending leg and a descending leg and another of said elements being substantially transparent in a predetermined wavelength range, one of said legs lying in said range;
- and
- adjusting said measuring means to said predetermined spectral sensitivity, the adjusting step including moving said at least one of said elements and said other element relative to each other to change the angle of incidence of radiation thereon to shift said one leg of said pattern and said range relative to one another.
1 more element
A method of printing a master on copy material having a predetermined spectral sensitivity comprising the steps of:
- providing a source of radiation;
- measuring the density of said master using measuring means which includes a plurality of measuring elements transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements, at least one of said elements having a transmission pattern which includes an ascending leg and a descending leg and another one of said elements being substantially opaque in a predetermined wavelength range, one of said legs lying in said range, and
- adjusting said measuring means to said predetermined spectral sensitivity, the adjusting step including moving said at least one of said elements and said other element relative to each other to change the angle of incidence of radiation thereon to shift said one leg and said range relative to one another.
A method for a photographic printer of printing a master on copy material having a predetermined spectral sensitivity, comprising the steps of:
- providing a source of radiation;
- measuring the density of said master in the photographic printer using measuring means which includes a plurality of measuring elements transparent to the radiation and a sensor, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of radiation on said elements and said sensor for determining radiation sensitivity, the measuring step including exposing said master to the radiation and directing the radiation from said master to said sensor;
- and
- adjusting said measuring means to said predetermined spectral sensitivity, including moving at least one of said elements independently of another of said elements to change the angle of incidence of radiation on said one element, the adjusting step also including exposing a calibration master to radiation and directing radiation from said calibration master to said sensor.
1 more element
A method for a photographic printer of printing a master on copy material having a predetermined spectral sensitivity, comprising the steps of:
- providing a source of radiation;
- measuring the density of said master in the photographic printer using measuring means which includes a plurality of measuring elements transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of radiation on said elements;
- adjusting said measuring means to said predetermined spectral sensitivity, including moving at least one of said elements independently of another of said elements to change the angle of incidence of radiation on said one element, the adjusting step also including evaluating a calibration master in the printer.
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation;
- means for directing radiation toward said elements along a predetermined path,
- said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements and said measuring means including a sensor downstream of said elements relative to the radiation from the source for determining the intensity of the radiation;
- and means for moving at least one of said elements independently of another of said elements to change the angle of incidence of the radiation on said one element with more than one of said elements being movable by said moving means, said sensor having an active surface of predetermined diameter, and said movable elements having a combined predetermined thickness less than one-half of said predetermined diameter.
2 more elements
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation;
- means for directing radiation toward said elements along a predetermined path,
- said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements and including a sensor downstream of said elements relative to the radiation from the source for determining the intensity of the radiation;
- and
- means for moving at least one of said elements independently of another of said elements to change the angle of incidence of the radiation on said one element,
- said directing means comprising an objective upstream of said elements relative to the radiation from the source having an opening with a predetermined maximum dimension, and said sensor having an active surface of predetermined diameter greater than or equal to one-tenth of said predetermined maximum dimension of said objective.
4 more elements
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation;
- means for directing the radiation toward said elements along a predetermined path;
- said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of radiation on said elements and including a sensor downstream of said elements relative to the radiation from the source for determining the intensity of the radiation;
- and means for moving at least one of said elements independently of another of said elements to change the angle of incidence of the radiation on said one element with only said one element being movable by said moving means, said sensor having an active surface of predetermined diameter, and said one movable element having a predetermined thickness less than one-half of said predetermined diameter of said sensor.
2 more elements
An apparatus for printing a master comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements;
- means for moving at least one of said elements independently of another of said elements to change the angle of incidence of the radiation on said at least one element, and
- an objective which is disposed at a predetermined distance from said elements;
- and wherein only said at least one element is movable by said moving means, said at least one element having a predetermined thickness, and said predetermined distance being substantially greater than said predetermined thickness.
2 more elements
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements, at least one of said elements having a transmission pattern which includes an ascending leg and a descending leg and another one of said elements being substantially transparent in a predetermined wavelength range, one of said legs lying in said range;
- and
- means for moving said at least one element and said other element relative to each other to change the angle of incidence of the radiation thereon to shift said one leg of said pattern and said range relative to each other.
1 more element
An apparatus for printing a master, comprising:
- means for providing radiation to the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements, at least one of said elements having a transmission pattern which includes an ascending leg and a descending leg and another of said elements being substantially opaque in a predetermined wavelength range, one of said legs lying in said range;
- and
- means for moving said at least one element and said other element relative to each other to change the angle of incidence of the radiation thereon to shift said one leg of said pattern and said range relative to each other.
1 more element
An apparatus for printing a master on photographic copy material having a predetermined spectral sensitivity comprising:
- means for exposing the master to radiation;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements;
- means for moving at least one of said elements independently of another of said elements to change the angle of incidence of the radiation on said at least one element;
- means for regulating said moving means to adjust said measuring means to the spectral sensitivity of the copy material,
- said measuring means including a sensor for determining the intensity of radiation coming from the master, and said regulating means being arranged to regulate said moving means in response to signals generated by said sensor upon being impinged by radiation from a calibration master.
2 more elements
An apparatus for printing a master on photographic copy material having a predetermined spectral sensitivity, comprising:
- means for producing radiation to expose the master;
- means for measuring the density of the master including a plurality of elements which are transparent to the radiation, said measuring means having a transmission pattern which shifts in dependence upon the angle of incidence of the radiation on said elements;
- means for moving at least one of said elements independently of another of said elements to change the angle of incidence of radiation on said one element;
- means for exposing a calibration master to the radiation, and
- means for regulating said moving means in response to radiation coming from the calibration master to adjust said measuring means to the spectral sensitivity of the copy material.
2 more elements
A method of calibrating a system for printing a copy master having a predetermined spectral sensitivity comprising the steps of:
- providing a source of radiation of a given spectrum;
- providing a test negative having a predetermined transmission pattern to said radiation with respective edges of increasing and decreasing transmission;
- measuring the radiation transmitted through said test negative using measuring means which includes at least one measuring element transparent to the radiation and having a transmission pattern with respective edges of increasing and decreasing transmission which shift in dependence upon the angle of incidence of the radiation upon said at least one element;
- moving said at least one element of said measuring means to change the angle of incidence of the radiation thereon;
- and
- determining the position to which said at least one element is moved to achieve an angle of incidence at which one of the edges of the transmission pattern of said at least one element coincides with a corresponding one of said edges of said test negative pattern.
3 more elements
Dependencies are inferred from the claim text.