EP0018505A2 — Banknote condition monitoring apparatus

Claim 1

Independent Claim 247 words

Banknote condition monitoring apparatus comprising a rotating drum 11 on the peripheral surface of which the banknotes 12 to be examined are held, for example by means of air suction 32, an optical scanning device 28,29,30, 24,22 which generates a scanning light beam which forms a scanning light bead 13 on the banknote 12 which cyclically scans the banknote transversely F to its direction of movement substantially without gaps, a cylindrical lens 14 extending in the scanning direction in front of the banknote 12 and which concentrates with a portion of its width the transmitted light beam 18 onto the banknote 12 and directs light remitted from the banknote via another part of its width to a light receiving device 16, 15,17 and characterised in that the transmitted light beam 18 is narrow and passes through the cylindrical lens 14 at a portion of its periphery, the rotational axis 19 of the drum is so displaced relative to the optical axis 20 of the cylindrical lens 14 that specularly reflected light 21 enters the same half of the cylindrical lens 14 as the transmitted light beam 18 but however separated from the same, and the specularly reflected beam 21 is deflected, in a distance substantially the same as the distance of the scanning device 22 from the point of incidence of the light bead 13 on the banknote 12, directly onto a photodetection device 23 without contacting the scanning member 22 of the optical scanning device 28,29,30,24,22.

Claim 2

Dependent Claim 247 words

Banknote condition monitoring apparatus comprising a rotating drum 11 on the peripheral surface of which the banknotes 12 to be examined are held, for example by means of air suction 32, an optical scanning device 28,29,30, 24,22 which generates a scanning light beam which forms a scanning light bead 13 on the banknote 12 which cyclically scans the banknote transversely F to its direction of movement substantially without gaps, a cylindrical lens 14 extending in the scanning direction in front of the banknote 12 and which concentrates with a portion of its width the transmitted light beam 18 onto the banknote 12 and directs light remitted from the banknote via another part of its width to a light receiving device 16, 15,17 and characterised in that the transmitted light beam 18 is narrow and passes through the cylindrical lens 14 at a portion of its periphery, the rotational axis 19 of the drum is so displaced relative to the optical axis 20 of the cylindrical lens 14 that specularly reflected light 21 enters the same half of the cylindrical lens 14 as the transmitted light beam 18 but however separated from the same, and the specularly reflected beam 21 is deflected, in a distance substantially the same as the distance of the scanning device 22 from the point of incidence of the light bead 13 on the banknote 12, directly onto a photodetection device 23 without contacting the scanning member 22 of the optical scanning device 28,29,30,24,22.

Claim 3

Dependent Claim 32 words

Banknote condition monitoring apparatus according to claim 1 and characterised in that said light receiving device comprises a light conducting rod 15 arranged to receive the remitted light on its side surface.

Claim 4

Dependent Claim 71 words

Banknote condition monitoring apparatus in accordance with either of claims 1 and 2 and characterised in that the scanning member 22 is arranged between an objective 24 and a strip-like concave mirror 25 and in that two plane mirrors 26,27 inclined at an angle to one another are arranged between the scanning member 22 and the concave mirror 25 for deflecting the scanning and the specularly reflected light beams 18, 21.

Claim 5

Dependent Claim 32 words

Banknote condition monitoring apparatus in accordance with an one of the preceding claims and characterised in that the remaining part of the cylindrical lens is used to pick up the remitted light.

Claim 6

Dependent Claim 26 words

Banknote condition monitoring apparatus in accordance with any one of the preceding claims and characterised in that the scanning member 22 is a mirror wheel 22.

Claim 7

Dependent Claim 29 words

Banknote condition monitoring apparatus in accordance with any one of the preceding claims and characterised in that the photodetection device 23 consists of a matrix of parallel connected photodiodes.

Claim 8

Dependent Claim 191 words

Banknote condition monitoring apparatus comprising a rotating drum 11,means 32 for holding the banknotes to be examined on the peripheral surface of the drum 11, an optical scanning device 28, 29, 30, 24, 22 located substantially at the focus of a concave mirror 25 and adapted to produce in the image plane of said concave mirror a scanning light beam 18 for scanning the banknotes point by point, line by line, an elongate generally cylindrical lens 14 extending in front of said drum 11 in the direction of line scanning F and adapted to project with a part of its width the scanning light beam 18 at an angle onto the banknotes and to return light remitted from the same with another part of its width onto a first detector 34 there being further provided a second detector 23 for detecting light 21 specularly reflected from the surface of said banknote 12 and deflected to the second detector via the cylindrical lens and said concave mirror, the second detector 23 being located at substantially the same optical distance from the drum as the optical scanning device 22 but not coincident therewith.

Claim 9

Dependent Claim 191 words

Banknote condition monitoring apparatus comprising a rotating drum 11,means 32 for holding the banknotes to be examined on the peripheral surface of the drum 11, an optical scanning device 28, 29, 30, 24, 22 located substantially at the focus of a concave mirror 25 and adapted to produce in the image plane of said concave mirror a scanning light beam 18 for scanning the banknotes point by point, line by line, an elongate generally cylindrical lens 14 extending in front of said drum 11 in the direction of line scanning F and adapted to project with a part of its width the scanning light beam 18 at an angle onto the banknotes and to return light remitted from the same with another part of its width onto a first detector 34 there being further provided a second detector 23 for detecting light 21 specularly reflected from the surface of said banknote 12 and deflected to the second detector via the cylindrical lens and said concave mirror, the second detector 23 being located at substantially the same optical distance from the drum as the optical scanning device 22 but not coincident therewith.

Claim 10

Dependent Claim 160 words

B anknote condition monitoring apparatus comprising an optical scanning device 22 located substantially at the focus of a concave mirror 25 and adapted to produce a scanning light beam 18 periodically and continuously displaced parallel to itself in the image space of said concave mirror, means 11, 13, 32 for moving the banknotes through the image space of said concave mirror and at an acute angle to said scanning light beam 18 whereby to scan the banknotes point by point line by line, a first detector 34 arranged to receive light remitted from the surface of said banknotes 12 and a second detector 23 for detecting light specularly reflected from the surface of said banknotes and deflected to the second detector 23 via said concave mirror 25, the second detector 23 being of a relatively small area and being located at substantially the same optical distance from the banknotes 12 as said optical scanning device 22 but not coincident therewith.

Claim 11

Dependent Claim 160 words

B anknote condition monitoring apparatus comprising an optical scanning device 22 located substantially at the focus of a concave mirror 25 and adapted to produce a scanning light beam 18 periodically and continuously displaced parallel to itself in the image space of said concave mirror, means 11, 13, 32 for moving the banknotes through the image space of said concave mirror and at an acute angle to said scanning light beam 18 whereby to scan the banknotes point by point line by line, a first detector 34 arranged to receive light remitted from the surface of said banknotes 12 and a second detector 23 for detecting light specularly reflected from the surface of said banknotes and deflected to the second detector 23 via said concave mirror 25, the second detector 23 being of a relatively small area and being located at substantially the same optical distance from the banknotes 12 as said optical scanning device 22 but not coincident therewith.

Banknote condition monitoring apparatus

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