JP2565904B2 - Magneto-optical composite head with built-in light emitting and receiving elements - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magneto-optical composite head capable of simultaneously reading a magnetic pattern and an optical pattern drawn on a recording medium.

(Prior Art) The applicant of the present invention has previously described a magneto-optical composite head as shown in FIG.
Developed 20.

In this, a light transmitting body (optical member) 25 formed of a light transmitting non-magnetic material is attached to a magnetic detection gap 24 of a magnetic sensor 23 in which a coil 22 is wound around a magnetic core 21, and optical data is recorded in the optical member 25. The optical fiber bundle 26 to be read is spliced and the magnetic sensor
The outside of 23 is covered with two holders 28.

A plurality of the magneto-optical composite heads 20 may be housed in the outer case 30 as shown in FIGS.

This magneto-optical composite multi-head 31 is, as shown in FIG.
The side surface 28a of the holder 28 of the magneto-optical composite head 20 is lowered, and the distance between the lower portion 28a and the outer case 30 is about 0.5 mm.
Pass the optical fiber bundle 26 through the gap of
26 is further passed through the protective tube 33 and is drawn out from the bottom surface 34 of the outer case 30 as shown in FIGS. 3A and 3B. 35 in FIG. 3 is a magnetic terminal, which is the magnetic sensor in FIG.
Put the tip of the pipe 37 through the lead wire 36 of 23 into the external case.
It is projected on the bottom surface 34 of 30.

(Problems of the prior art) As shown in FIGS. 2 to 4, the conventional magneto-optical composite multi-head 31 has a large number of optical fiber bundles 26 and 27 and magnetic terminals 35 mixed in a narrow portion. Was complicated and required careful handling.

Especially when the magneto-optical composite head 20 is assembled in the outer case 30, the optical fiber bundle 26 is assembled in the holder 28,
When soldering an external electric wire to the magnetic terminals 35 of FIGS.
Protective tube 33 pulled out of the outer case 30
The soldering iron was often touched. In particular, when the optical fiber is a plastic fiber, if the soldering iron comes into contact with the fiber through the protective tube 33, the fiber is damaged or the fiber is cut, which is a fatal problem.

(Object of the Invention) An object of the present invention is to simplify the wiring of the magneto-optical composite head and to make it easy to handle when incorporating it in a multi-head and soldering work.

(Means for Solving the Problems) As shown in FIG. 2, the magneto-optical composite head of the present invention is
In the magneto-optical composite head 20 in which the optical member 25 is arranged in the gap 24 at the tip of the magnetic sensor 23 and the optical fiber bundle 26 is joined to the optical member 25, as shown in FIG. The light emitting / receiving element 27 is installed inside the magneto-optical composite head 20, and the optical fiber bundle 26 is
It is characterized in that it is prevented from being pulled out of the 20.

(Embodiment) FIG. 1 shows an embodiment of an optical member 25, an optical fiber bundle 26, and a light emitting / receiving element 27, which are constituent materials of a magneto-optical composite head of the present invention. This is one in which the light emitting / receiving element 27 is attached in advance to the optical fiber bundle 26 connected to the optical member 25 with liquid resin or the like.

In the present invention, the optical member 25 is incorporated into the gap 24 at the tip of the magnetic sensor 23 as shown in FIG.
Forming 20. In this case, the light emitting / receiving element 27 is fixed, for example, in the optical fiber bundle passage hole 29 provided in the holder 28.

Further, when a plurality of magneto-optical composite heads 20 are incorporated into the outer case 30 to form the magneto-optical composite multi-head 31, the light emitting / receiving element 27 is, for example, the holder 28 in FIG.
It is fixed in the gap between the outer case 30 and the outer case.

As shown in FIG. 1, an insulating wire 35 for taking out an electric signal is attached in advance to the light emitting / receiving element 27 by a required length, and only the insulating wire 35 is pulled out to the outside of the magneto-optical composite head 20 to form an optical fiber bundle. 26 is not pulled out of the head 20.

The light emitting / receiving element 27 attached to the optical fiber bundle 26 may be an individual one in a case, or may be a chip mounted on a substrate.

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

(1) Only the insulated wire 35 for electric signals is drawn out of the magneto-optical composite head 20, and the optical fiber bundle 26 is not drawn out, so that the wiring is simplified.

(2) Since the optical fiber bundle 26 is not pulled out of the composite head 20, the soldering iron does not hit the optical fiber bundle during soldering and the optical fiber bundle is not burned.

(3) The magneto-optical composite head which is easy to handle can be obtained because the assembling into the outer case 30 and the soldering work become easy.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part of a magneto-optical composite head of the present invention,
FIG. 2 is an explanatory view of a conventional magneto-optical composite head, and FIG. 3A.
Is a side view of a conventional magneto-optical composite multi-head, FIG. 3B.
Is a bottom view of the multi-head, and FIG. 4 is a partial vertical cross-sectional view of the multi-head. 20 is a magneto-optical composite head 23 is a magnetic head 24 is a gap 25 is an optical member 26 is an optical fiber bundle 27 is a light emitting / receiving element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Kobayashi 6-1 Nishihiranuma-cho, Nishi-ku, Yokohama Furukawa Electric Co., Ltd. Inside the Yokohama Cable Works (72) Inventor Mio Yuda 3-27-2 Kitahanada, Sakai-shi In Minerva

Claims (1)

(57) [Claims] 1. A magneto-optical composite head 20 in which an optical member 25 is disposed in a gap 24 at the tip of a magnetic sensor 23, and an optical fiber bundle 26 is joined to the optical member 25.
A light emitting / receiving element 27 that is optically coupled to 26 is a magneto-optical composite head.
A magneto-optical composite head characterized in that the optical fiber bundle (26) is incorporated inside (20) so that the optical fiber bundle (26) is not pulled out to the outside of the head (20).