JPS6324460Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a round lead wire detection device.

First, a conventional round lead wire detection device will be explained with reference to FIGS. 1 and 2.

Light emitted from the tip of the light emitting fiber 1 is reflected by the surface of the round lead wire 3 and is irradiated onto the tip of the light receiving fiber 2. In this case, the surface of the round lead wire 3 has a hemispherical shape, and the amount of reflected light incident on the light receiving fiber 2 is very small. For this reason,
If the position of the round lead wire 3 is shifted or tilted from the center axis of the receiving fiber 2, the amount of received light will further decrease, making it impossible to determine the presence or absence of the round lead wire 3, resulting in instability and low reliability. There were flaws.

This invention was made to eliminate the above-mentioned drawbacks. This idea will be explained below.

3, 4, and 5 show an embodiment of this invention, which differs from the conventional example in that a plurality of light receiving fibers 2 are arranged concentrically around the light emitting fiber 1. It is.

Next, the operation will be explained. Emitter fiber 1
The light emitted from the tip of the round lead wire 3 is reflected by the plurality of light receiving fibers 2 arranged on the circumference around the light emitting fiber 1.
A minute amount of light reflected from the surface of the round lead wire 3 is received. Therefore, the amount of light received increases by the number of light receiving fibers 2 arranged. Furthermore, since the light-receiving fibers 2 are arranged on the circumference with the light-emitting fiber 1 at the center, the amount of light received by the light-receiving fibers 2 corresponding to each other becomes a differential input in response to the inclination of the round lead wire 3. The amount becomes constant.

Therefore, even if the position of the round lead wire 3 deviates from the center axis of the light emitting fiber 1, the scattered light on the surface of the round lead wire is reliably received within the circumferential range of the light receiving fiber 2 arranged on the circumference. can do.

As explained above, this invention has an emitter fiber facing the round lead wire at right angles, and a plurality of receiver fibers arranged on the circumference around the emitter fiber, making it easier to install. Not subject to physical constraints. Furthermore, the light emitted from the light emitting fiber is reflected off the surface of the round lead wire and is received by the number of light receiving fibers, so even if the light is slightly reflected from the center axis of the light emitting fiber, all of the light is received. Furthermore, even when the round lead wire is tilted, the amount of received light is a differential input, and the amount of received light is constant. Therefore, there is an advantage that the presence or absence of a minute round lead wire can be detected stably and reliably with high precision.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a conventional round lead wire detection device, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a plan view showing an embodiment of this invention, and Fig. 4 is Fig. 3. FIG. 5 is a front sectional view of FIG. 3. In the figure, 1 is a light emitting fiber, 2 is a light receiving fiber,
3 is a round lead wire, and 4 is a reflected light. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A round lead wire characterized by comprising a light emitting fiber facing perpendicularly to the round lead wire to be detected, and a plurality of light receiving fibers arranged on a circumference around the light emitting fiber. Detection device.