A device for measuring the size of apertures in a thin metal sheet having a table that can rotate, preferably in a stepwise manner, and having the sheet to be measured and a standard sheet mounted over openings in the table. A light source is conducted to a movable head and a stationary head. Phototubes in registry with the heads provide two electrical currents, one that is generated from light which has not passed through the sheet and one generated from light that has passed through either the standard or the sheet to be measured. A means for comparing the two currents provides a highly accurate measurement of the hole sizes since the device compensates for changes in light source intensity due to external factors. The device is particularly suited for measuring the size of holes where a high degree of accuracy is required such as in television aperture masks, fine mesh screens and the like.
A densitometer comprises first and second photocells for producing a signal representing the transmission of light through an apertured member. A settable reference signal source provides a signal representing the spacing of the apertures. The logarithm of the transmission and aperture spacing signals are determined. Means are provided for dividing the transmission logarithm signal by two, summing the spacing and divided logarithm signals and taking the antilog of the resultant signal. Digital display means display a digital reading of the value of the antilog of the resultant signal, giving a direct reading of average aperture diameter.
Optical sensing means, such as an optical image-forming system, is provided on the gripper of a robot and positioned to sense an object to be gripped. A signal, such as an image of the object or a portion thereof, is transmitted from the sensor to a remote detector via a fiber optic cable. A control signal, responsive to the detected signal from the sensor, is generated to actuate the robot arm and gripper to effect gripping of the object. The invention has broad applicability in that it is extremely light-weight and can be mounted on the gripper. The invention has particular adaptability to a fluid-actuated robot: in that instance the entire robot, including object sensing means and actuation means, is non-electrical and can be used in explosive environments.
An apparatus for testing the similarity in cross section and the disposition of each relative to a common axis of a plurality of similar bores formed in a burner tip and distributed around the axis.
There is disclosed an automatic apparatus for sequentially inspecting a plurality of selected areas of an apertured material. The apparatus comprises a light determination means including an established light source and a positioned light detection means, a movable retention means for retaining the apertured material, and a control means for actuating the light determination means and the movable retention means whereby the selected areas of the apertured material will be sequentially positioned between the light source and the light detection means whereupon light is projected through each of said areas. The light passing through the areas is detected by said light detection means. A method for inspecting is also disclosed.
A hole-size measuring system that enables measurement of the size of individual holes of a black matrix layer of a CRT. This system includes an imaging device for producing an enlarged image of holes of a black matrix layer, and an image processor for electrically processing the image produced by the imaging device to measure a size of the holes. A CCD camera may be used as the imaging device. The CCD camera may have an automatic focusing function and is movable along a black matrix layer. For a color CRT, the holes are divided into three groups for red, green and blue colors, and the image processor has functions of measuring an average size of selected ones of the holes in the respective groups.
