JP2565948B2 - Magneto-optical composite head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical composite head for magnetically and optically identifying bills and the like, and more particularly to the structure of the core and holder of the head. .

(Prior Art) The applicant of the present invention has previously proposed a magneto-optical composite head as shown in FIG.
Developed 10. This is for simultaneously reading the magnetic pattern and the optical pattern drawn on the recording medium, and the magnetic detection gap 12 of the magnetic sensor 11 formed by winding the coil 17 around the magnetic core 16 is formed of a light-transmissive non-magnetic material. Mounted optical transmissive body (optical member) 13, an optical fiber 14 for reading optical data is connected to the optical member 13, and the outside of the magnetic sensor 11, the optical member 13, etc. is covered with two holders 15. It is a thing.

(Problems of the prior art) When identifying a bill or the like with a magneto-optical composite head,
A plurality of magneto-optical composite heads 10 may be arranged side by side as shown in FIG. 8 to be used as a multi-head. In this case, it is necessary to narrow the interval L between the adjacent magneto-optical composite heads 10 in order to improve the identification accuracy.

However, the conventional magneto-optical composite head is as shown in FIG.
Since the optical fiber 14 must be arranged through the guide 19 of the holder 15, the width of the holder 15 becomes wide, and there is a limit to miniaturization of the holder 15. Therefore, when a plurality of magneto-optical composite heads 10 are arranged side by side as shown in FIG. 8, the holders 15 contact each other to form a gap L between the optical members 13 and it is difficult to perform highly accurate identification. was there. There is also a problem that the magneto-optical composite head 10 becomes large.

(Object of the Invention) The object of the present invention is to reduce the gap L between adjacent optical members 13 when a plurality of magneto-optical composite heads 10 are arranged side by side as shown in FIG. To miniaturize.

(Means for Solving Problems) The magneto-optical composite head of the present invention has a core as shown in FIG.
The core 25 of the magnetic head body 20 in which the coil 32 is wound around 25
An optical member 22 that is light-transmissive and formed of a non-magnetic material is arranged in the gap 21 between the tips of the optical fiber bundle 23 and the optical fiber bundle 23 is joined to the optical member 22.
In the magneto-optical composite head 24 covered by, the opening for passing the optical fiber bundle 23 through the core 25 of the magnetic head body 20.
40 is formed, and the outer surface of the holder 28 is formed with fitting portions 30 and 31 for fitting the holders of adjacent magneto-optical composite heads to each other when two or more magneto-optical composite heads are arranged side by side. Is.

(Operation) The magneto-optical composite head of FIG. 1 which is an embodiment of the present invention is an optical member to which the optical fiber bundle 23 of FIG. 3 is joined.
22, the left and right cores 25, and the left and right holders 28 are assembled and completed as shown in FIG. In this case, the optical fiber bundle 23
Are drawn out through a guide 40 formed in the core 25.

When a plurality of magnetic head bodies 20 shown in FIG. 1 are arranged side by side to form a multi-channel type as shown in FIG. The fitting part 30 and the downward fitting part 31 are fitted to each other vertically. As a result, the magnetic head body 20 is moved to the fourth
Even if a plurality of devices are arranged side by side as shown in the figure, the lateral spread becomes smaller than in the case of FIG.

(Embodiment) FIGS. 1 to 4 show an embodiment of the magneto-optical composite head of the present invention. In these figures, 20 is a magnetic head body, 21
Is a tip gap formed at the tip of the main body, 22 is an optical member formed of a non-magnetic light transmitting material, 23 is an optical fiber bundle joined to the optical member, 25 is a core of the magnetic head main body, 28 is a magnetic head A holder that covers the outside of the main body 20, 32 is a coil wound around the outer periphery of the core, 30 and 31 are fitting portions formed on the lateral surface of the holder 28, and 40 is a guide by a hole or groove.

In the present invention, even if the guide 40 is provided on the core 25 and the effective area of the core 25 is reduced to half that of the conventional product, the strength of the magnetic field is
Since it is almost the same as 0.9979, the number of turns of the coil 32 can be the same as the conventional one.

In FIGS. 1 to 4, 30 is an upward fitting portion, and 31 is a downward fitting portion. These are formed upside down on the left, right, upper and lower sides of the cover 28 of the magnetic head body 20, and when the magnetic head bodies are arranged side by side as shown in FIG.
And are formed so as to fit with each other.

The fitting portions 30 and 31 do not have to face upward and downward as shown in the drawing, they can be fitted to each other, and the magnetic head body 20
Other structures may be used as long as they can suppress the lateral spread when a plurality of them are arranged side by side as shown in FIG.

(Effects of the Invention) The magneto-optical composite head of the present invention has the following effects.

(1) Holder 28 when placed side by side as shown in FIG.
Since the fitting portions 30 and 31 can be combined so as to fit with each other, the width of the gap W can be reduced to 1/2 or less of the gap L of the conventional FIG. Be miniaturized.

(2) Even if the magneto-optical composite heads 24 are arranged side by side as shown in FIG. 4, the gap between the optical members 22 of the adjoining magneto-optical composite heads 24 is small, so that highly accurate discrimination can be performed.

(3) Since the guide 40 is formed on the core 25, the optical fiber 23 can be easily drawn around, and no undue force is applied to the optical fiber 23.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a magneto-optical composite head of the present invention, FIG. 2 is a longitudinal sectional view of the head of FIG. 1, FIG. 3 is an exploded view of the head of FIG. 1, and FIG. 1 is an explanatory view of the heads arranged side by side, FIG. 5 is an explanatory view of a conventional magneto-optical composite head, FIG. 6 is an exploded view of the composite head of FIG. 5, and FIG. FIG. 8 is a longitudinal sectional view and FIG. 8 is an explanatory view of using a conventional magneto-optical composite head. 20 is a magnetic head main body 21 is a tip gap 22 is an optical member 23 is an optical fiber bundle 24 is a magneto-optical composite head 25 is a core 30, 31 is a fitting portion 40 is a guide

Claims (1)

(57) [Claims] 1. An optical member 22 formed of a non-magnetic material that is transparent to light is arranged in a gap 21 between the tips of a core 25 of a magnetic head body 20, and the optical member 22 has an optical fiber bundle 23.
In the magneto-optical composite head 24 in which the outer surfaces thereof are joined by the holder 28, the core 25 of the magnetic head main body 20 is formed with the opening 40 through which the optical fiber bundle 23 is inserted.
On the outer surface of the holder 28, when two or more magneto-optical composite heads are arranged side by side, mating portions 30 and 31 are formed so that the holders of adjacent magneto-optical composite heads are fitted with each other. Optical composite head.