Abstract The method of effecting exact trimming of the ends of detector sub-arrays which consist of a base upon which a series of tiny infrared mesa-type photodiode elements are arranged in a longitudinally oriented fashion. The method comprises spraying a tiny jet of abrasive particles in a direction perpendicular to the supporting base of the detector sub-array while masking the sensitive detector elements with a thin elastomer strip in order not only to protect the elements themselves from damage, but to define a precise line of cut in the base and provide a true square end edge which will permit a plurality of similar subarrays to be accurately aligned longitudinally end to end. Exactness within very close tolerances is required in order to maintain the specified spacing between the individual elements.
The method of trimming a sub-array of photosensitive elements disposed upon a base in aligned longitudinally oriented succession by providing a straight edge of thin elastomer material, accurately aligning and clamping said strip under tension over the array to be trimmed with the end edge of the array extending underneath and beyond said straight edge, micrometrically positioning said end edge so that it extends a predetermined distance from the adjacent sensitive element and finally cutting said extended edge square by directing a stream of abrasive particles in plane perpendicular thereto.
Claim 2
Independent Claim
90 words
The method of trimming a sub-array of photosensitive elements disposed upon a base in aligned longitudinally oriented succession by providing a straight edge of thin elastomer material, accurately aligning and clamping said strip under tension over the array to be trimmed with the end edge of the array extending underneath and beyond said straight edge, micrometrically positioning said end edge so that it extends a predetermined distance from the adjacent sensitive element and finally cutting said extended edge square by directing a stream of abrasive particles in plane perpendicular thereto.
Claim 3
Dependent Claim
21 words
The method of claim 1 in which said end is cut and trimmed within a range of tolerance of 0.002 inches.
Claim 4
Dependent Claim
32 words
The method of claim 1 in which said end is cut and trimmed within a range of tolerance of 0.002 inches, said strip protecting said elements from damage during said trimming operation.