JPS5813382Y2 - Kirokuyomitriyou light pen - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the structure of the detection end of a light pen for reading records.

As shown in FIG. 1, a conventional record reading light pen has an optical fiber bundle 3 consisting of a light-transmitting optical fiber 1 and a light-receiving optical fiber 2 inserted and fixed in a cylindrical body 4 made of cemented carbide 7. , the cylindrical body 4
was inserted into the housing 5, and the end 6 of the cylindrical body 4 was fixed by protruding outward from the tapered end 7 of the housing 5.
This part is held in the hand and the tip of the cylindrical body 4 is brought into contact with the surface 8 to be read.

In this case, the tip 6 of the cylindrical body 4 directly rubs against the surface 8 to be read and wears out, so the material of the cylindrical body 4 needs to be highly hard. Since this may cause damage to the surface, the tip 5 of the cylindrical body 4 is generally formed into a spherical shape without sharp corners.

Therefore, as can be seen from FIG. 3, which shows the use of the tip part during use, the conventional light ben is
When the spherical part of the optical fiber bundle 3 contacts the surface 8 to be read, the distance between the end 9 of the optical fiber bundle 3 and the object to be read becomes a dog, and the light emitted from the tip 9 of the optical fiber bundle 3 is diffused and at the same time The amount of reflected light from the target surface 8 was also reduced, resulting in extremely poor resolution.

In addition, as another structure, in order to eliminate the above drawback, a fourth
As shown in the figure, there is one in which the tip of a cylindrical body 4 made of cemented carbide has an extremely thin wall thickness and is shaped like a needle.

In this case, the distance between the surface to be read 8 and the end surface 9 of the optical fiber bundle becomes small, and the resolution can be improved, but there is another drawback that the surface to be read 8 is easily damaged and damaged. In addition, as shown in FIG. 5, there is a drawback that the surface to be read 8 and the end surface 9 of the optical fiber 3 often come into close contact 7, making reading impossible.

The object of the present invention is to provide a light pen for reading records in which the shape of the tip of the cylindrical body 4 is improved in order to eliminate these drawbacks.

The light pen for reading records provided by the present invention has an optical fiber bundle inserted and fixed into the center hole of a cylindrical body up to the tip of the hole. It is characterized in that its shape is formed by overlapping two large and small rotating bodies with smooth convex curved surfaces coaxially with the small rotating body at the tip and the center axis of the cylindrical body as the axis. .

An embodiment of the light pen for reading records according to the present invention will be described with reference to the drawings.

FIG. 6 is an enlarged view of the tip of the recording/reading light pen where the present invention is implemented.

The optical fiber bundle 3 consisting of the light transmitting optical fiber 1 and the light receiving optical fiber 2 and having a cross-sectional diameter of approximately Q, 4 mm has an inner diameter of approximately 0.4 mm.
The cylinder body 4 is inserted and fixed into the center hole 10 of the cylindrical body 4 with an outer diameter of about 2 mN, and the cylindrical body 4 is inserted and fixed into the housing 5 with the tip 6 exposed.

The tip 6 of the cylindrical body 4 is processed into a shape in which a large hemisphere 11 and a small hemisphere 12 are stacked coaxially, with the small hemisphere 12 at the tip, and the tip 9 of the optical fiber bundle 3 is the reading target. The structure is sufficiently close to the surface 8.

On the upper side, the cylindrical body 4 protects, supports, and shields the optical fiber bundle 3, so its material is made of cemented carbide shown in JIS H2SO4 or alumina spinel based on abrasion etc. Various synthetic precious stones such as Alumina, wear-resistant porcelain whose main components are alumina, titanium, etc., steel that has been subjected to surface hardening treatments such as nitriding treatment, hard chromium treatment, and carburizing treatment are suitable for use.

Moreover, the tip 6 of the cylindrical body 4 only needs to be further provided with a protrusion having a smooth outer surface to bring the end 9 of the optical fiber bundle 3 close to the surface 8, so that the shape is a hemisphere. In general, any combination of rotating bodies having a smooth convex curved surface, such as a spheroid or a parabola of revolution, may be used.

FIG. 7 shows an ultra-fine TIL, for example, an inner diameter of about 0.31n.
A cylindrical body 13 made of stainless steel or the like with an outer diameter of approximately 0.5 mm.
After inserting and fixing the optical fiber bundle 3 into the inside of the fiber bundle 7, the tip is processed into a hemispherical shape corresponding to the small hemispherical body 12 shown in FIG. It can also be obtained by inserting it into another cylindrical body 14 made of hard metal or the like, exposing the small hemispherical part, and fixing it with nails.

In this case as well, the shape does not necessarily have to be limited to a hemispherical shape, and the material does not have to be limited to cemented carbide, as in the case of the example shown in FIG.

When using the record reading light pen according to the present invention,
Since the end of the optical fiber bundle is located very close to the surface to be read, resolution can be dramatically improved, and the end of the cylindrical body that holds the optical fiber bundle is formed smoothly. Therefore, the surface to be read will not be damaged.

[Brief explanation of the drawing]

Fig. 1 is a side view with the tip of a conventional light pen for recording and reading cut away; Fig. 2 is an enlarged cross-sectional view of a cylindrical body in which an optical fiber bundle is installed in a conventional light pen; Fig. 3; 4 is a partially enlarged sectional view of the tip of a conventional light pen, FIG. 4 is a partial sectional view of a conventional light pen with a needle-shaped tip, and FIG. 5 is a partial sectional view of the tip of the light pen in FIG. 4. 6 is a partially enlarged sectional view of the tip of the record reading light pen according to the present invention, and FIG. 7 is a record reading in another embodiment according to the present invention. FIG. 3 is a partially enlarged cross-sectional view of the tip of the light pen. 1... Optical fiber for light transmission, 2... Optical fiber for light reception, 3... Optical fiber bundle, 4, 13, 14
......Cylindrical body, 5...Housing, 8.
...Reading surface, 9...Optical fiber bundle tip, 10...Center hole, 11...Large hemisphere, 12...Small hemisphere.

Claims (1)

[Scope of utility model registration request] A light pen for reading records, which includes a housing, a cylindrical body housed in the housing so that its tip protrudes from the housing, and a feeding optical fiber and a light receiving optical fiber inserted and fixed into a center hole of the cylindrical body. , the shape of the tip portion of the cylindrical body is a two-step shape in which a small smooth second convex surface is provided at the tip of a smooth first convex surface that contacts the recording surface during recording reading;
A recording/reading light pen characterized in that each end face of the light-transmitting optical fiber and the light-receiving optical fiber extends to the tip of the second convex surface.