JPS6049206A - Body displacement detector - Google Patents

Abstract

PURPOSE:To detect the displacement of a body by providing a light guide which is so arranged to flex according to the displacement of the body, a light emitting device which inputs light to one terminal of the light guide, and a photodetector which receives the light from the one terminal at the other terminal of the light guide. CONSTITUTION:A body displacement detector 1 is provided with the light emitting device 3 which inputs the light at one terminal of the light guide 2 and also the photodetector 4 at the other terminal to receive the light from the one terminal. When the body 5 is displaced, the light guide 2 flexes. Consequently, photodetection characteristics are unchanged with time unless the body 5 is displaced, and the quantity of photodetection decreases greatly at the point P of time of the displacement of the body 5, thereby detecting the displacement of the body 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an object displacement detection device using a light guide path such as an optical fiber.

As is well known, light travels in a straight line, rj
If a bend occurs in the path, the optical loss will increase and the result will be
: The output light 11'L decreases compared to . Therefore, ′β
I'', the town name uses this property of meaning to express the change of the object i''l.
As a result of repeated inspections of ``+, ic, l/j'', sharpening, and cutting, the device was invented.

In other words, the present invention uses a light guide path to convert an object c (=
The purpose is to detect objects (4).
) Y = emitter inputting light at one end of the path, rMi led) 1
′, the other side of the path *(1, 1, which receives light from one end: light, and when the amount of light received by this light receiver is less than a certain value, there is a sensor that detects the object. (I!!i will change the object's value 'Ill 9:, place it at t1/).

In this configuration, the center of the light guide path c1 7', the 11th point J"1
-Pipe, 1!1 no synthetic resin iJ flexible body, liquid light rectifier hollow +jJ flexible tube or l, iY; '/ Neuber snow can be used, -1!1.1 to 9 J'4-・When using -, d2, core bend 4Jr 4 and knot h++
In order to reduce the difference with the refractive index,
The refractive index of the cladding/2I-no' refractive index 1noi-('Ij
The critical angle of total internal reflection that can be obtained is improved. '−,,jj'4
At the bend in the tail path: light loss, i.e., reduction; 1: is extremely J+
, 'fi, -J-7,, Kokichi, which is a detection device with a slight motion, is -C cut.

Object displacement detection device c with such a configuration (if -1,
For example, objects that require linearity 1/(arrogant, 7A-Route 4
−． It is possible to detect when an object bends by keeping it blue, or to detect the movement or protrusion of an object by bending the light guide when the object moves or protrudes. It is extremely useful because it can detect the displacement of an object, or it can be used as an OR-compatible switch element or an AND-compatible switch element in response to the movement of an object.

Next, the present invention will be explained in more detail with reference to the drawings. FIGS. 1 and 2 show different embodiments of the object displacement detection device 1 according to the present invention. In the figure, an object displacement detection device 1 according to the present invention is equipped with a light emitter 3 that inputs light at one end of a light guide path 2, and a light receiver 4 at the other end to receive light from one end. . In such a device, when the object 5 is displaced from the state shown in FIG. 1 to the state shown in FIG. 2, the light guide path 2 is bent as shown in FIG. Then, in the state of FIG. 1 where the object 5 is not displaced, the light reception characteristics were as shown in FIG. The displacement of the object 5 is detected. In detecting the displacement of the object C, a sensor 6 is provided which operates according to the amount of light received by the light receiver 4 to sense the displacement of the object. This sensor 6 can incorporate a light emitting indicator, an acoustic indicator, or various command devices.

In the object displacement detection device of the present invention, the light receiver 4 is held at a constant gap close to the other end of the light guide path 2. However, in some cases, the other end of the light guide moves away from the light receiver when the object is displaced. It can also be configured as

In this invention, the shape and position of the object is not limited to the above embodiments, and various forms of pressing rods and rotating bodies (
(for object displacement, opening/closing detection, switch functions, etc.) or a balance-shaped body (limit load detection, switch function, etc.)

It is also possible to use the

According to the second aspect of the present invention, a light guide path is arranged to bend according to the displacement of an object, a light emitting device inputs light into one end of the light guide path, and a light emitting device is connected to the other end of the heavy equipment light guide path. By configuring an object displacement detection device that includes a light receiver that receives light from one end of the object, and a sensor that detects the displacement of the object when the amount of light received by the light receiver is less than a certain value, it is possible to A wide object displacement sensing device can be obtained economically.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the object displacement detection device according to the present invention, FIG. 2 is a diagram of the operating state of the device in FIG. 1, and FIG.
3b is a light receiving characteristic diagram for the case shown in FIG. 2. FIG. ■ = Object displacement detection device, 2: Light guide path, : 3 = Light emitter,
4: Light receiver, 5: Object, 6: Sensor. Fat revision applicant Junko Co., Ltd. F;g, 2 [] Fij, 3a Fil, 3 b B now rrl-time open-

Claims (1)

[Claims] J) a light guide arranged to bend according to the displacement of an object;
A light emitter that emits light at one end of the light guide, a light receiver located at the other end of the light guide that receives light from one end, and a light receiver that detects the displacement of an object when the amount of light received by this light receiver is less than a certain value. Object displacement detection device comprising a sensor for sensing 2) In the object displacement detection device 11''6'' according to claim 1, it is assumed that the light guide path is an optical fiber. 111j object displacement detection device.