Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A method of testing the pattern of a printed circuit board, comprising the steps of: emitting intermittent light from a stroboscope synchronously with a feed velocity of said printed circuit board; gathering said intermittent light by a condenser lens; converting said light to exciting light through a filter; reflecting said exciting light by a half mirror to project the same upon said printed circuit board perpendicularly thereto and passing through said half mirror the fluorescent light emitted from the substrate of said printed circuit board; forming an image of the fluorescent light passed through said half mirror by means of an imaging lens while eliminating any other light than the fluorescent light through another filter, thereby passing therethrough the fluorescent image; picking up the fluorescent image by a TV camera; attenuating, by an amount corresponding to the afterimage component, the preceding-frame pattern video signal obtained from said TV camera with said stroboscope turned on, and storing the attenuated pattern video signal in a memory means; subtracting the stored attenuated pattern video signal from the present-frame pattern video signal obtained from said TV camera with said stroboscope turned on, thereby producing a negative pattern of the wiring pattern; and comparing said negative pattern with a reference pattern to check whether the wiring pattern of said printed circuit board is normal or not.
Claim 2
Independent Claim
221 words
A method of testing the pattern of a printed circuit board, comprising the steps of: emitting intermittent light from a stroboscope synchronously with a feed velocity of said printed circuit board; gathering said intermittent light by a condenser lens; converting said light to exciting light through a filter; reflecting said exciting light by a half mirror to project the same upon said printed circuit board perpendicularly thereto and passing through said half mirror the fluorescent light emitted from the substrate of said printed circuit board; forming an image of the fluorescent light passed through said half mirror by means of an imaging lens while eliminating any other light than the fluorescent light through another filter, thereby passing therethrough the fluorescent image; picking up the fluorescent image by a TV camera; attenuating, by an amount corresponding to the afterimage component, the preceding-frame pattern video signal obtained from said TV camera with said stroboscope turned on, and storing the attenuated pattern video signal in a memory means; subtracting the stored attenuated pattern video signal from the present-frame pattern video signal obtained from said TV camera with said stroboscope turned on, thereby producing a negative pattern of the wiring pattern; and comparing said negative pattern with a reference pattern to check whether the wiring pattern of said printed circuit board is normal or not.
Claim 3
Independent Claim
249 words
An apparatus for testing the pattern of a printed circuit board, comprising: a stroboscope for emitting intermittent light synchronously with a feed velocity of said printed circuit board; a condenser lens for gathering the intermittent light emitted from said stroboscope and irradiating the gathered light to said printed circuit board; a filter for converting the light of said stroboscope to exciting light; a half mirror for reflecting the exciting light gathered by said condenser lens and converted by said filter, then projecting the reflected light upon said printed circuit board perpendicularly thereto, and passing the excited fluorescent light from the substrate of said printed circuit board; an imaging lens for forming an image of the fluorescent light passed through said half mirror; a filter for eliminating any other light than the fluorescent light out of the entire light passed through said half mirror; a TV camera for picking up the fluorescent image formed by said imaging lens; a memory means for storing the preceding-frame pattern video signal obtained from said TV camera with said stroboscope turned on and attenuated by an amount corresponding to the afterimage component; a means for subtracting said attenuated stored pattern video signal from the present-frame pattern video signal obtained from said TV camera with said stroboscope turned on; a means for generating a reference pattern; and a means for producing a negative pattern of the wiring pattern from the output signal of said subtracting means and comparing said negative pattern with said reference pattern.
Claim 4
Independent Claim
249 words
An apparatus for testing the pattern of a printed circuit board, comprising: a stroboscope for emitting intermittent light synchronously with a feed velocity of said printed circuit board; a condenser lens for gathering the intermittent light emitted from said stroboscope and irradiating the gathered light to said printed circuit board; a filter for converting the light of said stroboscope to exciting light; a half mirror for reflecting the exciting light gathered by said condenser lens and converted by said filter, then projecting the reflected light upon said printed circuit board perpendicularly thereto, and passing the excited fluorescent light from the substrate of said printed circuit board; an imaging lens for forming an image of the fluorescent light passed through said half mirror; a filter for eliminating any other light than the fluorescent light out of the entire light passed through said half mirror; a TV camera for picking up the fluorescent image formed by said imaging lens; a memory means for storing the preceding-frame pattern video signal obtained from said TV camera with said stroboscope turned on and attenuated by an amount corresponding to the afterimage component; a means for subtracting said attenuated stored pattern video signal from the present-frame pattern video signal obtained from said TV camera with said stroboscope turned on; a means for generating a reference pattern; and a means for producing a negative pattern of the wiring pattern from the output signal of said subtracting means and comparing said negative pattern with said reference pattern.
Claim 5
Dependent Claim
16 words
The apparatus as defined in claim 2, wherein said half mirror consists of a dichroic mirror.
Claim 6
Dependent Claim
27 words
The apparatus as defined in claim 2, further comprising an A/D converter for converting the output video signal of said TV camera to a digital video signal.
Claim 7
Dependent Claim
37 words
The apparatus as defined in claim 4, further comprising a multiplier for multiplying the digital video signal of said A/D converter by an attenuation factor, wherein the output of said multiplier is stored in said memory means.