JPS6152624A - Scan type optical sensor - Google Patents

Abstract

PURPOSE:To simplify the constitution of a titled sensor, to make it inexpensive, also to use only once piece each of a light source and a photodetector, and to make a trouble for correcting a dispersion unnecessary by executing an optical scan by a gap which has arranged in one line and opposed each one end face of two optical fiber bundles. CONSTITUTION:Each one end of an optical fiber bundle 2 for leading a light from a light source 1, and an optical fiber bundle 3 for leading said light to a photodetector 3 is arranged in one line and held by fiber holders 6, 7. Also, a scanning part 8 is constituted by providing a gap on the holders 6, 7 so that fibers 2-1 and 4-1, and 2-n and 4-n are opposed to each other. Moreover, a rotary slit plate 5 is provided on the gap part which has been cut on the way without changing an order of the fibers of the fiber bundles 2, 4. In this state, when the slit plate 5 is rotated in the direction as indicated with an arrow, the light of the light source 1 passes through in order of the fibers 2-1, 2-2-2-n, and executes an opical scan in the scanning part 8. Also, the fibers 4-1-4-1 are switched successively by the slit plate 5, and by synchronizing with the fibers 2-1- 2-n, the light passes through and goes into the photodetector 3. Accordingly, when a medium is carried in the direction as indicated with an arrow 9 by the scanning part 8, the optical scan can be executed in its vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical sensor for a bill validator used in banks and the like.

For banknote validating machines used in banks etc. in recent years.

Although demand is rapidly increasing, this banknote validator requires a large number of sensors in the part that automatically recognizes banknotes.

Therefore, there is a demand for the development and supply of highly reliable and low-cost sensors.

[Conventional technology]

BACKGROUND ART Conventionally, as a scanning type optical sensor used in a banknote validating machine, one using a Raded light scan using a polygon mirror or one using an LED array 1 and a photodiode array 2 as shown in FIG. 3 has been widely used.

[Problem that the invention seeks to solve]

Is the Rede light scanning method using the polygon mirror described above effective? Parts such as the Rigon mirror are expensive. In addition, the LED-diode array method requires a large number of elements and wires, is expensive, and occupies a large area for the amplifier circuit, wires, etc., so the area for placing other sensors is limited, and the characteristics between the elements ( There are problems such as the need for correction for each element due to large variations in luminous intensity, sensitivity, etc.).

[Means for solving problems]

The present invention provides a scanning optical sensor that solves the above-mentioned problems, and the means thereof is to align a large number of optical fibers with one end face in a line, and to bundle the other end faces into a core. A first optical fiber bundle in which a light source is disposed at a portion thereof and a plurality of optical fibers are arranged so that one end face thereof is aligned in a line, and facing each other with a gap provided between the aligned end face of the first optical fiber bundle. , and a second original fiber bundle in which the other end face is put together and a light receiver is arranged in the core part, and the first and second optical fiber bundles are cut in the middle of each, and the cut optical fibers are cut. A means for sequentially optically coupling the signals is provided so as to perform optical scanning in the gears and the gears.

[Effect]

The above-mentioned scanning optical sensor is provided with an optical fiber bundle that guides light from a light source and an optical fiber bundle that guides light to a light receiver. By performing optical scanning in the gap, the configuration is simple and inexpensive, and since only one light source and one light receiver are required, there is no need to take the trouble of correcting variations between elements as in the past. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a perspective view of essential parts of an embodiment of the present invention.

As shown in FIG. 1, this embodiment includes a light source 1, a first optical fiber bundle 2 that guides light from the light source 1 to a scanning section, and a light receiver 3.
, a second optical fiber bundle 4 that guides light from the scanning section to a light receiver 3, and a rotating slit plate 5. The tenth optical fiber bundle 2 includes a large number of optical fibers 2-1
~2-n force, one end of which is grouped together and facing light source 1, and the other end is 2-1 + 2-2...2
-n are arranged in a row and held in the fiber holder 6. The second optical fiber bundle 4 is composed of a large number of optical fibers 4-1 to 4-n, one end of which is connected to the light receiver 3, and the other end is connected to the optical receiver 3 at an angle of 4-1°. 4-
The optical fibers 2-4 and 4-1°2-.
and 4 are facing each other, and create a file ″
The optical scanning section 8 is configured to face the n passer holder 6 with a gap therebetween. Further, each of the first and second optical fiber bundles is cut in the middle without changing the order of the optical fibers to provide a gap portion, and a rotating slit plate 5 is provided in the gear and gap portion. This rotating pickpocket, the pickpocket on the top plate 5) 5a
, 5b are provided and the optical fibers 2-1 and 4-1 +
24 and 4-2 + 2-. The light is passed sequentially such as 1 and 4-rl.

This embodiment configured as described above is a rotary pickpocket.

When the top plate 5 is rotated in the direction of the arrow, the light from the light source 1 passes through the optical fibers 2-1 + 2-2 . . . 2-n in this order, and the scanning section 8 can perform optical scanning. Further, the optical fibers 4-4 to 4-n that receive light in the scanning section 8 are rotated.

The optical fibers 2-1 to 2-n are sequentially switched by the top plate 5, and the light passes through the optical fibers 2-1 to 2-n and enters the light receiver 3. Therefore, by transporting the medium in the direction of arrow 9 in the scanning section 8, optical scanning can be performed in a direction perpendicular to the transport direction.

Another embodiment of the present invention is shown in FIGS. In this figure, the same parts as in FIG. 1 are designated by the same reference numerals.

This embodiment differs from the previous embodiment in that a two-dimensional matrix optical switch 10.11 is used as shown in FIG. 2 in place of the rotating slit plate 5 of the previous embodiment. are synchronized and the optical fibers 2-1 and 4-1
The optical fibers connected to the light source 1 and the optical fibers connected to the light receiver 3 are switched such as t2-2, 4-212-n, and 4-n. In this embodiment configured in this way, optical scanning can be performed in the scanning section 8 similarly to the previous embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, an optical fiber bundle that guides light from a light source and an optical fiber bundle that guides light to a light receiver are provided, the end faces of each optical fiber are arranged in a line, and both are separated with a gap between them. It is possible to perform optical scanning in the gap by arranging the fiber bundles to face each other, cutting each fiber bundle midway, and sequentially optically coupling the fibers.The structure is simple and inexpensive. ,
In addition, since only one light source and one light receiver are required, there is no need to take the trouble of correcting variations between elements as in the prior art, which is a significant advantage.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an essential part showing one embodiment of a scanning optical sensor of the present invention, FIG. 2 is a perspective view of an essential part of another embodiment of the invention, and FIG. 3 is a conventional scanning optical sensor. FIG. In the figure, 1 is a light source, 2 and 4 are optical fiber bundles, 3 is a light receiver,
5 is a rotating slit plate, 6 and 7 are optical fiber holders, and 8 is a scanning section. % Fraudulent applicant Fujitsu Limited patent application agent

Claims (1)

[Claims] 1. A first optical fiber bundle in which one end face of a large number of optical fibers is aligned in a line, the other end face is grouped together, and a light source is disposed in the part; The optical fibers are aligned with one end face thereof in a line to face the aligned end face of the first optical fiber bundle with a gap provided, and the other end faces are grouped together and a light receiver is disposed in the part. A second optical fiber bundle is provided, the first and second optical fiber bundles are cut in the middle of each, and means is provided for sequentially optically coupling the cut optical fibers to perform optical scanning in the gap. A scanning optical sensor characterized by: 2. The scanning optical sensor according to claim 1, wherein a rotating slit plate common to the first and second optical fiber bundles is used as means for sequentially optically coupling the cut optical fibers. . 3. The scanning optical sensor according to claim 1, wherein a two-dimensional matrix optical switch is used as a means for sequentially optically coupling the cut optical fibers.