Apparatus for measuring sizes of articles
First Claim
1. An apparatus for measuring sizes of articles comprising:
- a light projecting device for projecting light toward an article from one side of the article;
a photo-sensor device arranged on the other side of the article and including a plurality of photo-detectors arranged in array in a first direction such that light projected from said light projecting device and impinging upon the photo-sensor device without being interrupted by the article is received by one or more photo-detectors;
a driving device for reciprocally moving said article and said light projecting device and photo-sensor device relative to each other in a second direction perpendicular to said first direction;
a shifting device for shifting said photo-sensor device in said first direction into at least first and second positions which are mutually separated by a distance smaller than a pitch at which said photo-detectors are arranged in array;
a control device for controlling said driving device and shifting device such that when said article and light projecting device and photo-sensor device are moved by said driving device in a forward direction, said photo-sensor device is in said first position and when said article and light projecting device and photo-sensor device are moved by said driving device in a backward direction, said photo-sensor device is in said second position; and
a signal processing device for processing output signals generated from said photo-detectors under a control of a control signal supplied from said control device to measure size of the article with a resolution higher than the pitch at which said photo-detectors are arranged in array.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for measuring sizes of articles including a light projecting device for projecting light toward an article placed on a stationary transparent plate from one side of the plate, a photo-sensor device arranged on the other side of the plate and having plural photo-detectors arranged in array in Y direction to receive light projected from said light projecting device and impinging upon the photo-sensor device without being interrupted by the article, a driving device for reciprocally moving said light projecting device and photo-sensor device relative to the article in X direction perpendicular to the Y direction, and a shifting device for shifting said photo-sensor device in the Y direction between first and second positions which are mutually separated by a half of a photo-detector array. During a forward movement of the light projecting device and photo-sensor device, the photo-detectors is shifted into the first position, and during a backward movement of the light projecting device and photo-sensor device, the photo-detectors are shifted into the second position. By processing output signals generated from said photo-detectors during forward and backward movements, a size of the article in the Y direction can be measured with a high resolution equal of a half of the photo-detector array pitch.
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Citations
9 Claims
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1. An apparatus for measuring sizes of articles comprising:
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a light projecting device for projecting light toward an article from one side of the article;
a photo-sensor device arranged on the other side of the article and including a plurality of photo-detectors arranged in array in a first direction such that light projected from said light projecting device and impinging upon the photo-sensor device without being interrupted by the article is received by one or more photo-detectors;
a driving device for reciprocally moving said article and said light projecting device and photo-sensor device relative to each other in a second direction perpendicular to said first direction;
a shifting device for shifting said photo-sensor device in said first direction into at least first and second positions which are mutually separated by a distance smaller than a pitch at which said photo-detectors are arranged in array;
a control device for controlling said driving device and shifting device such that when said article and light projecting device and photo-sensor device are moved by said driving device in a forward direction, said photo-sensor device is in said first position and when said article and light projecting device and photo-sensor device are moved by said driving device in a backward direction, said photo-sensor device is in said second position; and
a signal processing device for processing output signals generated from said photo-detectors under a control of a control signal supplied from said control device to measure size of the article with a resolution higher than the pitch at which said photo-detectors are arranged in array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification