Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-04-08
1981-10-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, G01N 2188
Patent
active
042937760
ABSTRACT:
A banknote condition monitoring apparatus features a mirror wheel (22) located substantially at the focus of a concave mirror strip (25) with an intervening plane mirror (26) to fold the beam path. The mirror wheel (22) scans an incident light beam from a source (28) to form a transmitted light beam in the image space of the concave mirror (25) which is continuously displaced parallel to itself to and fro through the image space. The transmitted light beam is directed via a cylindrical lens (14) onto the surface of a drum (11) carrying the banknotes (12) to be monitored on its peripheral surface by way of air suction via the channels (32). Light remitted from the surface of the banknote is directed through the lower half of the cylindrical lens (14), impinges on a light conducting rod (15) and is detected at an and face of the light conducting rod by a light receiving device (33). The mean output signal from this light receiving device indicates the presence of holed, torn or dog-eared or dirty banknotes but not strips of clear adhesive film which are recognized by the specularly reflected light beam (21) which falls on a stationary photodetector (23). The optical distance of the stationary detector (23) from the drum is equal to that of the mirror wheel scanning device so that the specularly reflected light beam always passes through a stationary point in space.
REFERENCES:
patent: 3360659 (1967-12-01), Young
Mankel Siegfried
Sick Erwin
Erwin Sick GmbH-Optik-Elektronik
Hostetter Darwin R.
Nelms David C.
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