Radiant energy – Luminophor irradiation – With ultraviolet source
Patent
1988-09-28
1991-07-09
Berman, Jack I.
Radiant energy
Luminophor irradiation
With ultraviolet source
2504591, G01N 2164
Patent
active
050308335
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and device for detecting objects containing fluorescent substances, and more particularly, an adhesive-application detection method and device for not only detecting the failure of adhesive application or the state of adhesive application, but also controlling the quantity of adhesive to be applied by the fluorescent emission in the adhesive application process in devices such as collators, box-making machines, book-binding machines or the like.
BACKGROUND ART
So far as one of the methods used for detecting the presence or absence of objects to be detected, the quantities and positions thereof, there has been a method for irradiating ultraviolet rays to an object to be detected, to which is glued a fluorescent substance or to which is applied or added a fluorescent agent for which the luminous emission from the fluorescent substance or agent is detected by a photosensor. However, the intensity of luminous emission from a fluorescent substance is fundamentally very weak, such that in order to improve the detection rate, a sensor, an ultraviolet-ray source and a work must be surrounded by light-shielding plates or boxes so as to eliminate adverse effects due to external light rays or the like. Consequently, there exists the defect that special boxes or the like must be provided, and thus, the range of utilization is considerably limited. Therefore, in order to improve the above-mentioned method, there has been proposed a method for disposing an optical filter with a narrow transmission wavelength band in front of a photosensor so as to selectively detect only the luminous emission from a fluorescent substance. However, according to this method, the luminous emission from the fluorescent substance for which the intensity is fundamentally considerably weak, is received through a filter with a low degree of transmissivity so that the output signal from the photosensor is further decreased in strength. As a consequence, there arises the defect that not only does the amplifier circuit in the succeeding stage become complex in construction, but also a reduction in the S/N ratio results. In addition, in order to process the above-mentioned signal, an expensive device of complex construction is needed. As described above, there has not been available so far a method capable of detecting a fluorescent substance in an inexpensive and simple manner, and consequently, visual inspection is presently employed in practice. However, according to the latter method, a person must continue a simple task for a long period of time and furthermore, must continuously observe the weak light in a dark place. Thus, there arise the problems of the production efficiency being considerably low; resultant individual differences; and the method not being safeguarded against health hazards.
Furthermore, in order to detect the failure and state of adhesive application in the adhesive application process for devices such as collators, box-making machines and book-binding machines or the like, a photosensor has been utilized in such a way that light is projected on an applied paste and the light reflected therefrom or transmitted therethrough is intercepted by the photosensor, whereby the quantity of applied paste or whether or not the applied paste exists, is detected in response to the variations in the light-reception signals output from the photosensor. However, according to this method, whether or not a paste exits is detected in response to the intensity of the reflected or transmitted light which is received, requiring that a light beam with a predetermined intensity must be projected at an object to be detected, while maintaining a predetermined distance and angular relationship between an object to be detected and the photosensor. In addition, objects to be detected or the color and composition of an object to be compared must be maintained uniform. For instance, in the case of collators, in most cases an adhesive is applied at the width of 1 mm and the light beam with a p
REFERENCES:
patent: 3956630 (1976-05-01), Mellows
patent: 4778999 (1988-10-01), Fisher
Chiba Masahiko
Katsuta Tetsuro
Miyama Hiroshi
Nozaka Yoshiki
Berman Jack I.
Dai Nippon Insatsu Kabushiki Kaisha
Hanig Richard
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