Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
Apparatus for the automatic optical property testing of substantially two-dimensional relief-structured patterns, characterized in that an optical scanning head is positioned at a fixed operating distance (1) above a test pattern including a base plate having an object thereon of nominal height (h) above said plate movable relative to said head, said scanning head directing a light band, obliquely incident at an angle α, to said base plate and comprising a first linear photodiode array arranged parallel to said light band and perpendicularly above the intersection of the light band with the plane corresponding to said nominal height (h) in which the light reflected from said object is incident if the nominal height (h) is maintained, and a pair of second diode arrays arranged parallel to said first linear photodiode array, with a mutual spacing (m) in which the light reflected at said base plate is incident if the operating distance (1) has been kept, and that the output signals of said second diode array pair act as control signals for restoring the operating distance (1).
Claim 2
Dependent Claim
176 words
Apparatus for the automatic optical property testing of substantially two-dimensional relief-structured patterns, characterized in that an optical scanning head is positioned at a fixed operating distance (1) above a test pattern including a base plate having an object thereon of nominal height (h) above said plate movable relative to said head, said scanning head directing a light band, obliquely incident at an angle α, to said base plate and comprising a first linear photodiode array arranged parallel to said light band and perpendicularly above the intersection of the light band with the plane corresponding to said nominal height (h) in which the light reflected from said object is incident if the nominal height (h) is maintained, and a pair of second diode arrays arranged parallel to said first linear photodiode array, with a mutual spacing (m) in which the light reflected at said base plate is incident if the operating distance (1) has been kept, and that the output signals of said second diode array pair act as control signals for restoring the operating distance (1).
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1, characterized in that the light band has a width of the order of 10 μm.
Claim 4
Dependent Claim
50 words
Apparatus according to claim 1, characterized in that the output signal of said first linear photodiode array (17a) is fed to an edge detector (207) generating a binary representation of the output signals of said first linear photodiode array (17a) by means of an up-dated black and white threshold value.
Claim 5
Dependent Claim
37 words
Apparatus according to claim 3, characterized in that continuous light and dark areas, respectively, of the binary representation are evaluated by edge-triggered counters (209, 210) and the counts are compared with predetermined nominal values (test circuit 211).
Claim 6
Dependent Claim
33 words
Apparatus according to claim 7, characterized in that test circuits for permissible patterns (profile recognition circuit means 212) are triggered if the nominal values are exceeded during the evaluation of the binary representation.
Claim 7
Dependent Claim
96 words
Apparatus according to claim 1, characterized in that the scanning head (40) comprises a fourth linear diode array (41) which is arranged parallel to said first linear photodiode array (17a), said fourth diode array (41) being positioned perpendicularly above the intersections of the boundary lines of the light band (43) with a further permissible height range, and that the output signals of said fourth linear diode array are fed to a further edge detector (222), whose output signals together with the signals generated by the first edge detector (207) are processed in a reflection detector (223).