JPH0793843A - Transmission type magnetic and optical sensor - Google Patents

Abstract

PURPOSE:To simultaneously read a magnetic pattern and an optical pattern on the same position on a recording medium by providing an optical fiber of an optical detection device on a light-transmissive material of a magnetism detection gap part. CONSTITUTION:The recording medium F simultaneously plotting the magnetic pattern and the optical gradation pattern on the same position by a printing ink incorporating magnetic material powder is moved while being adhered to or close to the transmissive material 2 provided on the magnetism detection gap part of a magnetic head. At this time, when a beam from a light emitting element 5 provided on a side opposite to the transmissive material 2 of the medium F is projected to the rear surface of the medium F, and transmits through the medium F, a transmission beam is made incident on an optical fiber 7 through the transmissive material 2, and is received by a light receiving element (b), and the optical pattern of the medium F is detected. In such a case, since the terminal of the fiber 7 is arranged in the width direction of the transmissive material 2 at a required interval, the optical pattern is detected over the whole width of the transmissive material 2. Further, at the time of moving the magnetic head, the magnetic pattern on the medium F is read by a tip of a magnetic core 8 being in contact with or close to the medium F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type magnetic and optical sensor used for discriminating the authenticity of banknotes, and relates to a magnetic pattern and an optical pattern recorded on the same portion of a recording medium.
And can be read at the same time.

[0002]

2. Description of the Related Art Conventionally, there has been a magnetic head type magnetic sensor as shown in FIG. 3 as a magnetic sensor. This is magnetic core A
The presence of a magnetic substance near the gap C of the magnetic core A is detected by detecting the induced current flowing in the coil B attached to the outer periphery of the coil or by detecting the change in the impedance of the coil B, and the The pattern is read.

Further, conventionally, as an optical sensor, as shown in FIG. 4A, light emitted from a light emitting element D is condensed by a lens E and projected on a recording medium F, and reflected light from the recording medium F is collected. For example, the lens G collects light on the light receiving element H for detection,
As shown in FIG. 4B, the light emitted from the light emitting element I is condensed by the lens J, projected on the recording medium F and transmitted through the medium F, and the transmitted light is condensed by the lens K. Some of them read the optical density pattern drawn on the recording medium F by making the light incident on the light receiving element L.

More recently, it has become possible to draw a magnetic pattern and an optical density pattern on the recording medium F at the same time by mixing a magnetic powder into the printing ink. There is also a device in which a sensor is incorporated into one device to read a magnetic pattern and an optical pattern.

However, if the magnetic sensor and the optical sensor are simply incorporated in the same device, the mounting positions of both sensors are different, so that the magnetic pattern and the optical pattern at the same location on the recording medium F are read at the same time. It is not possible.
Therefore, there is a problem that even if both magnetic and optical patterns are drawn in the same place, they cannot be effectively utilized.

In view of this, there has conventionally been a device capable of simultaneously detecting magnetic information and optical information in the same area of a recording medium (for example, the invention disclosed in Japanese Patent Publication No. 49-32130). As shown in FIG. 5, the coil 71 is attached to the magnetic core 70.
Magnetic information of the recording medium 72 is detected by a magnetic sensor formed by winding a coil, and light from a light source 73 below the recording medium 72 is transmitted through the recording medium 72 so that a photoelectric element inside a gap (space) 74 of the magnetic core 70. Recording medium 72 by receiving light at 75
The optical information of is detected.

[0007]

However, the one shown in FIG. 5 has the following problems. ． Photoelectric element 75 inside the gap 74 of the magnetic core 70
Since the light received by is converted into an electric signal and guided to the outside of the magnetic core 70, noise is generated under the influence of the current flowing through the magnetic core 70 or is easily influenced by external noise. was there.

[0008] Since the photoelectric element 75 is arranged inside the magnetic core 70, there is a limit to miniaturization.

[0009]. As shown in FIG. 6, since the width L of the gap 74 of the magnetic core 70 is normally wider than the width M of the recording medium 72 to be detected, in order to improve the resolution in the width direction of the recording medium 72, the width of the gap 74 is increased. It suffices that light can be received uniformly from all directions, but since the photoelectric element 75 receives light through the gap 74, the photoelectric element 75
Cannot be arranged in the width direction of the gap 74, so that it was difficult to increase the resolution.

[0010]

SUMMARY OF THE INVENTION The present invention provides a transmission type magnetic and optical sensor capable of reading both magnetic and optical patterns at the same location on a recording medium at the same time, and being compact and capable of high resolution reading. To provide.

As shown in FIGS. 1 and 2, the transmission type magnetic and optical sensor of the present invention has a transparent material in the magnetic detection gap portion 10 of the magnetic core 8 of the magnetic sensor 1 for reading the magnetic pattern of the recording medium F. 2 is provided, and the translucent material 2 is provided with end portions 11 of a plurality of optical fibers 7 of an optical detection device for reading the optical pattern of the recording medium F, and the end portion 11 is the translucent material. 2 is disposed on the translucent material 2 so as to face the recording medium F so that the transmitted light transmitted through the recording medium F can be incident from the opposite side, and is also disposed at a desired interval in the width direction of the translucent material 2. It is a thing.

[0012]

In order to use the transmission type magnetic and optical sensor of the present invention, for example, as shown in FIG. 1, the magnetic pattern and the optical density pattern are formed at the same location by the printing ink mixed with the magnetic substance powder. The recording medium F drawn at the same time is moved while being in close contact with or close to the transparent material 2 provided in the magnetic detection gap portion 10 of the magnetic head 4.

At this time, the rear surface side of the recording medium F (the translucent body 2
When the light from the light emitting element 5 arranged on the opposite side) is projected on the back surface of the recording medium F and transmitted through the recording medium F, the transmitted light is incident on the end portion 11 of the optical fiber 7 through the transparent material 2. Then, the optical fiber 7 receives the light by the light receiving element 6 outside the magnetic core 8, and the optical pattern of the recording medium F is detected.
In this case, since the terminals 11 of the optical fibers 7 are arranged at desired intervals in the width direction of the light transmitting material 2, the light pattern can be reliably detected over the entire width direction of the light transmitting material 2.

Further, when the magnetic head 4 moves, the recording medium F
The magnetic pattern of the recording medium F is read by the tip of the magnetic core 8 which is in contact with or close to.

[0015]

[Embodiment 1] An embodiment of a transmission type magnetic and optical sensor of the present invention will be described in detail with reference to FIGS. 2 is a magnetic sensor 1, which reads the magnetic pattern of the recording medium F. The magnetic sensor 1 shown in FIG.
It is an induction type magnetic head comprising a coil 9 and a coil 9 wound around it. As the magnetic sensor 1, a magnetic head using a magnetoresistive element or a hall element may be used in addition to the illustrated one.

1 and 2, reference numeral 2 is a rectangular parallelepiped light-transmitting material, 5 is a light emitting element, 6 is a light receiving element, and 7 is an optical fiber, and these constitute an optical detection device 3. The light emitting element 5 is arranged on the back side of the recording medium F, and the light receiving element 6 is arranged on the front side of the recording medium F. The transparent material 2 is a magnetic core 8
It is arranged and fixed in the gap portion 10 at the lower end portion of the optical fiber 7, and the end portions 11 of the plurality of optical fibers 7 are provided in the translucent material 2. Moreover, in this case, the end portion 11 of the optical fiber 7 is arranged on the transparent material 2 so as to face the recording medium F so that the transmitted light transmitted through the recording medium F can enter from the side opposite to the transparent material 2, and The transparent material 2 is arranged at uniform intervals over the entire width direction. The transparent material 2 is a transparent material such as glass or plastics.

[0017]

The transmission type magnetic and optical sensor of the present invention has the following effects. (1) Since the detection part of the magneto-optical sensor 1 is formed near the magnetic detection gap part 10, and the optical fiber 7 of the optical detection device 3 is provided on the light-transmitting material 2 arranged in the magnetic detection gap part 10. Therefore, the magnetic pattern and the optical pattern at the same location on the recording medium F can be read at the same time.

(2) Magnetic patterns at different locations at the same time
The possibility of erroneous reading is less than that of a sensor that separately reads the optical or optical patterns, and highly accurate reading is possible.

(3) The magnetic sensor 1 and the optical detection device 3 are integrated, and the optical fiber 7 of the optical detection device 3 is integrated.
Are provided on the light-transmitting material 2 arranged in the magnetic detection gap portion 10, the end portions 11 of the optical fibers 7 are arranged in an orderly manner without variation, and the end portions 11 can be easily positioned and downsized. Becomes

(4) The end 11 of the optical fiber 7 is the transparent material 2
The recording medium F is arranged at desired intervals in the width direction of the recording medium F.
Is reliably detected over the entire width direction of the translucent material 2, the resolution is improved, and the detection accuracy is also improved.

(5) Since light is output through the optical fiber 7, there is no influence of noise.

[0022]

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an optical detection device for a transmission type magnetic and optical sensor according to the present invention.

FIG. 2 is a side view of the transmission type magnetic and optical sensor of the present invention.

FIG. 3 is a perspective view showing a conventional magnetic head.

FIG. 4A is a perspective view showing an example of a conventional optical sensor,
(B) is a perspective view showing another example of the conventional optical sensor.

FIG. 5 is an explanatory diagram showing an example of a conventional magnetic and optical sensor.

FIG. 6 is an explanatory view of a bottom surface side of a magnetic core of the magnetic / optical sensor of FIG.

[Explanation of symbols]

 1 is a magnetic sensor 2 is a translucent material 3 is an optical detection device 7 is an optical fiber 8 is a magnetic core 10 is a magnetic detection gap portion 11 is an end portion F is a recording medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mio Uda 3 27-2 Kitanahanacho, Sakai City, Osaka 2 Minerva Co., Ltd. (72) Inventor Fumito Yamamoto 3 27 2 Kitanahanacho, Sakai City, Osaka Company Minerva

Claims (4)

[Claims] 1. A light-transmitting material (2) is provided in a magnetic detection gap portion (10) of a magnetic core (8) of a magnetic sensor (1) for reading a magnetic pattern of a recording medium (F), and the same light-transmitting material is provided. Material (2)
An end portion (11) of a plurality of optical fibers (7) of an optical detection device for reading the optical pattern of the recording medium (F) is provided in the end portion (11), and the end portion (11) is the translucent material (2). ) Is arranged on the translucent material (2) facing the recording medium (F) so that the transmitted light transmitted through the recording medium (F) can enter from the opposite side, and the width direction of the translucent material (2). A transmissive magnetic and optical sensor, characterized in that it is arranged at desired intervals. 2. A transmissive magnetic and optical sensor, wherein the magnetic sensor (1) of claim 1 is an inductive magnetic head. 3. A transmission type magnetic and optical sensor, wherein the magnetic sensor (1) according to claim 1 is a magnetic head using a magnetoresistive element. 4. A transmission type magnetic and optical sensor, wherein the magnetic sensor (1) according to claim 1 is a magnetic head using a hall element.