Optics: measuring and testing – Of light reflection – With diffusion
Patent
1997-03-14
1999-06-22
Rosenberger, Richard A.
Optics: measuring and testing
Of light reflection
With diffusion
25055916, G01J 350
Patent
active
059147865
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for measuring properties of a printed surface. Such a device is for instance a densitometer with which the density of the printed image and/or of the separate basic colours can be measured.
Devices of this type comprise a viewer which is placed over the part of the surface for measuring. In known devices this viewer is situated on the side remote from the user, so that it is difficult to see and awkward to place over the printed surface for measuring. Known devices are generally provided with an information display on which the measured values are shown. When the user wishes to measure at a position somewhat removed from himself, the display is not sufficiently visible to enable reading of the measured values. For each measurement the user must then pick up the device in order to be able to look at the display.
Another drawback of the known devices is that an overall view of all important data cannot be obtained therewith. A separate measuring device must be used for each quantity to be measured.
The invention now has for its object to provide a device of the type stated in the preamble with which these drawbacks are obviated. This object is achieved with the device for measuring properties of a printed surface according to the invention characterized. Herein the viewer is situated on the side of the device facing toward the user, so that it can be seen very easily, even at a greater distance, and can be placed precisely on the surface part for measuring. Moving of the housing from the positioning situation into the measuring position takes place very comfortably with a single movement of the wrist.
In another embodiment of the present invention, the information display is arranged on the housing such that in the measuring position it extends at an angle of between 10.degree. and 40D relative to a plane defined by the base and extends substantially parallel to the pivot shaft. Thus is achieved that when the housing is pivoted into the measuring position, the information display pivots into a osition very suitable for reading, so that this information display can be read properly even at a great distance. In this embodiment, the angle amounts substantially to 25.degree..
A further favorable development is characterized in claim 4. By placing the viewer on the protrusion it can be observed very well from different directions.
In another advantageous embodiment of the present invention, a number of control keys are arranged on the side of the information display lying above the characters. The control keys are hereby situated at a location very close to the fingers of the user when the latter is holding the device to position the viewer and pivot the housing from the positioning situation into the measuring position.
In the current embodiment, at least one of the control keys is a measurement type selection key with which the processing device can be switched into different processing modes for the measurement signals. Once the device has been positioned, i.e. the viewer has been placed on the surface for measuring, different measurements can be performed successively in simple manner by depressing the measurement type selection key. A very suitable embodiment is the processing modes comprise a density measurement of a printing plate and a density measurement of an image surface. The device can thereby be used in two different departments of a printing firm, i.e. the department where the printing plates are manufactured and the phototypesetting or lithographic reproduction department.
In a further embodiment of the present invention, the processing modes comprise a density measurement of a printed surface and a gloss measurement of the printed surface. In this embodiment, the sensor unit comprises a main sensor which is arranged straight above the viewer and a first light source which is directed at the viewer at an angle. The sensor unit further comprises a second light source and a gloss sensor in mutually opposing positions which are directed onto the viewer at an angle. H
REFERENCES:
patent: 3771877 (1973-11-01), Rosencranz
patent: 3892492 (1975-07-01), Eichenberger
patent: 4053235 (1977-10-01), Hampton et al.
patent: 5198875 (1993-03-01), Bazin et al.
patent: 5260584 (1993-11-01), Popson et al.
patent: 5400138 (1995-03-01), Peterson et al.
Grafisch Management Adviesbureau GMA. B.V.
Rosenberger Richard A.
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