JPS60185324A - Light switch unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a switch device, such as a belt (1), a long-shaped drive stop switch such as a conhair switch, and a switch for stopping the closing operation of a power win 1' of a vehicle. This invention relates to an optical switch device suitable for use as a switch, 7,000, etc.

(Prior Art) Conventionally, for example, in a belt conveyor used in an assembly line, a plurality of switch devices are arranged at appropriate intervals along the heald conveyor 7, and the heald conveyor is switched off in the event of an emergency or other various causes. When an operator wants to stop the machine immediately, he or she only has to operate one of the plurality of switch devices.

However, if any of the plurality of switch devices is not within the reach of the operator, there will be a delay in the timing of operating the switch device, resulting in a problem that the belt converter cannot be stopped immediately.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems. (2) Each time we provide an optical switch device that is used for

(Structure of the Invention) In order to achieve the above object, the structure of the present invention includes: a first elastic plate formed in a band shape of an elastic material and erected in the width direction; and a first elastic plate formed in a band shape of an elastic material. The second elastic plate overlapped with the first elastic plate and the first and second elastic plates are bent multiple times over the entire overlapped surface of the two elastic plates, and the two elastic plates are subjected to an external force in each width direction. An optical fiber that is locally distorted when it is partially elastically strained due to the bending of the fiber, and a
and light receiving means for generating a switch signal in response to a change in the light transmitted from the light emitting means through the optical fiber due to local distortion of the optical fiber. be.

(Effect of the invention) However, by configuring the present invention in this way,
A single light switch device according to the present invention can be used as
It can be placed on the inside wall of a lotus vehicle, on the window frame of a vehicle power window (3), or along the lighting system or emergency health system inside a building, and the operator can position it as needed to the nearest location. By applying 1 force in the width direction to the optical switch device part, a switch signal is generated from the light receiving means. , stopping the power windows, turning on and off the lighting system of the building, operating the emergency system, etc. can be realized instantly and reliably.

In addition, in the present invention, as mentioned above (because the optical transmission effect of optical fiber is utilized, the operation of this branch end switch device can be stabilized without being affected by electromagnetic waves when used in a factory etc.). .

Furthermore, in the present invention, as described above, since the optical fiber is sandwiched between the first and second elastic plates, the optical fiber is protected from being directly exposed to excessive external pressure or heating. The reliability of this kind of optical switch device can be improved. Furthermore, in the present invention, since the overlapping surfaces of both the elastic plates that sandwich the optical fiber are both flat, the branch tip switch device can be provided with a simple structure and low cost (4). can. Furthermore, in the present invention, elastic strain is caused in both the width directions of both elastic plates in the same direction to locally distort the optical fiber, so that no unreasonable force is applied to the optical fiber. It is possible to improve the durability of the branch tip switch device.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.
The figure shows an example of an optical switch device according to the present invention applied to emergency stop of a belt conveyor in an assembly factory, for example.
0, a light emitter 20 and a light receiver 30 connected to the light transmitting body 10, and an electric circuit section 40 connected to the light emitter 20 and the light receiver 30. Optical transmission body 10
, as shown in FIGS. 1 and 2, include a pair of band-shaped elastic thin plates 11.13, a single optical fiber 12, and a pair of fixing members 1.4. ．． 15, both elastic thin plates 11.13
are superimposed on each other and vertically arranged in their respective width directions, and are arranged along the longitudinal (5)-shaped installation floor surface of the heat converting hair.

Since the optical fiber 12 is held between both elastic thin plates 11.13 along the longitudinal direction, the central portion of the optical fiber 12 is held between one end of each of the elastic thin plates 11.11 in the longitudinal direction as shown in FIG. As shown in FIG. 2, it is folded upward in a meandering manner to form a meandering part] 2a and a straight part 12I), and the outer ends of the valleys of these meandering parts 12a and straight parts 12b are connected to both elastic thin plates 1.
1.13, each extending outward from the other end in the longitudinal direction.

In this case, the optical fiber 12 is held between the two elastic thin plates 11 and 13 in a meandering manner in the vertical direction at a predetermined curvature over the entire overlapping surface thereof, and the predetermined curvature has a microscopic shape in the meandering portion 12a of the optical fiber 12. This is to ensure that there is no loss of personnel.

The re-fixing members 14, 15 are rod-shaped members with a square cross section made of an elastic material, and each of the fixing parts +, 4'+4. ], 5. Each lower half of the elastic thin plates 11 and 13 is sandwiched from the outside by the side walls of each side wall and placed along the open-handed installation floor surface of the belt conveyor. immovably (6) fixed; In this case, each fixing element 14, 15, due to its flexibility, is in uniform contact with the lower half of each elastic sheet 11, 13. In addition, each fixing member 14.15
The height of the side walls in the longitudinal direction is such that each fixing member 14.15 is connected to each lower portion of the meandering portion 12a of the optical fiber 12 and the straight portion 121) via both elastic thin plates 11.13.
It is set to hold. This means that when both elastic thin plates 11 and 13 receive an external force from one side in their respective width directions, each portion of both elastic thin plates 11 and 13 that receives this external force curves in the same direction, and as a result, This means that the meandering portion 12a of the optical fiber I2 is locally bent corresponding to each curved portion of both elastic thin plates 11.13.

The light emitter 20 has a built-in light emitting diode (21) (see FIG. 3), and its light emitting surface is exposed from its outer end into the meandering portion 1.2a of the optical fiber 12. On the other hand, the photoreceiver 30 is connected to a photodiode 31.
(see FIG. 3), and its light-receiving surface is exposed from the outside 61i:l inside the straight portion (7) 12b of the optical fiber 12 and connected to the outer end thereof. The electric circuit section 40 includes an amplifier 41 shown in FIG. 3 and reference voltage generators 42 and 44 in its casing.
, a summing amplifier 43 connected to the amplifier 41 and the reference voltage generator 42 , an L transistor circuit 45 connected to the summing amplifier 43 , and a comparator 46 connected to the summing amplifier 43 and the reference voltage generator 44 . It is composed of

Amplifier 41 connects photodiode 3 at its inverting input terminal.
1 to the positive side terminal of the first DC power supply, and its non-inverting input terminal is grounded via an input resistor 41a. is connected to the feedback 1 low resistor 41b. Therefore, the amplifier 41 receives the positive power supply voltage Vd from the first DC power supply under the conduction caused by the reception of light from the light emitting diode 21 of the potdiode 31, and the human resistor 41.8 and the feedback resistor 4 l b The amplified voltage Va is generated by cooperation with the amplified voltage Va. In such a case, the amplified voltage Va is
The degree of conduction (8) increases (or decreases) by 112 in response to a decrease (or increase) in the degree of conduction (8) due to a decrease (or increase) in the amount of light received in step 1. Note that in FIG. 3, reference numeral 41C indicates an IS lift correction capacitor of the amplifier 41.

The reference voltage generator 42 is composed of a potentiometer, and generates a reference negative voltage from the slider 42a by dividing the negative power supply voltage -d from the second DC power supply. Summing amplifier 43
is each input resistor 43a.

43b are connected to the output terminal of the amplifier 41 and the slider 42a of the reference voltage generator 42, respectively. The summing amplifier 43 also has an input resistance 43C at its non-inverting input terminal.
A feedback resistor 43d is connected between the inverting input terminal and the output terminal of the summing amplifier 43. Therefore, the summing amplifier 43 has each input resistor 4.3a.
, 43b, 43C and the feedback resistor 43d, the amplified voltage Va from the amplifier 41 and the reference 9 voltage from the reference voltage generator 42 are summarily amplified to produce a summative amplified voltage vb. In such a case, the summative amplified voltage vb decreases (or increases) as the amplified voltage Va from the amplifier 41 increases (or decreases) by -F. In FIG. 3, (9) each reference numeral 43e and 43f indicates a drift correction capacitor and a diode of the summing amplifier 43.

The transistor circuit 45 has a transistor 45a, which has a resistor 45 at its base.
b to the output terminal of the summing amplifier 43.

Further, the emitter of the I-transistor 45a is grounded, and the collector of the I-transistor 45a is connected to the positive terminal of the first DC power supply via a light emitting diode ζ21 and a resistor 45C. Accordingly, the 1H transistor 45a amplifies the current flowing into the light emitting diode 1-'' 21 under the supply voltage +Vd from the first III current power source in accordance with the addition amplification voltage 2b from the summing amplifier 43. In other words, the degree of conduction of the light emitting diode 21, that is, the inflow current thereof increases (or decreases) in accordance with the decrease (or increase) of the sum amplified voltage vb under the amplification effect of the transistor 45a. This means that the light emitting diode 21 emits light toward the photodiodes 1 and 31 through the optical fiber 12 in an amount proportional to its degree of conduction, that is, the inflow current (10) The reference voltage generator 44 is composed of a potentiometer. Then, the power supply voltage -+-Vd from the first DC power source is divided to generate a reference positive voltage from the slider 44.a. The comparator 46 has an inverting input terminal 51 connected to the output terminal of the summing amplifier 43 via a resistor 46a, and a non-inverting input terminal of the comparator 46 via a resistor 46b to the reference It is connected to the slider 44a of the voltage generator 44.

Therefore, this comparator 46 compares the summing amplified voltage vb from the summing amplifier 43 with the reference positive voltage from the reference voltage generator 44, and only when the summing amplified voltage Vl) falls below the reference positive voltage. Generates an output signal at high frequency.

In this embodiment configured as described above, a worker is performing assembly work while operating the heat converter.
It is also assumed that the device of the present invention is in an operating state. At this time, both elastic thin plates 11 of the optical transmission body 10. ．． 13 are both in their original state, the light from the emitter 20 is transmitted to the receiver 30 by the optical fiber I2 without being attenuated. Therefore, in the electric circuit section 40, the amplifier 41 generates the amplified voltage Va under the degree of conduction corresponding to the amount of light received by the photodiode 3I from the light emitting diode 21,
The summing amplifier 43 generates the summing amplified voltage b based on the amplified voltage Va and the reference negative voltage from the reference voltage generator 42, and the transistor 4.5a emits light by an amplifying action according to the summing amplified voltage vb. The current flowing into the diode 21 is amplified.

In such a case, even if the optical or electrical characteristics of the device of the present invention vary due to various disturbances, when the amount of light received by the photodiode 3 decreases, the amplified voltage Va rises to - and the addition When the amplification voltage vb decreases and the amount of light emitted from the light emitting diode 21 to the photodiode F31 via the optical fiber 12 increases, and on the other hand, the amount of light received by the photodiodes 1 and 31 increases, the amplification voltage Va decreases and the addition amplification increases. As the voltage vb increases, the optical fiber 12 of the light emitting diode 21
Since the amount of light emitted to the photodiode 31 via the optical fiber 12 is reduced, the addition amplified voltage vb is always stabilized at a low level (higher than the reference positive voltage from the reference voltage generator 44) under the optical feedback effect of the optical fiber 12. I will do it. Thereby, the amount of light emitted from the light emitting diode 21 is always constant.

Furthermore, at this stage, since the optical fiber 12 does not generate microbent loss, the addition amplified voltage vb is higher than the reference positive voltage from the reference voltage generator 44, and the comparator 46 generates an output signal. do not.

In such a situation, if a situation occurs that requires an emergency stop of the heat converter, the operator should:
At the working position, the optical transmission body 1 located closest to it
Each part of both elastic thin plates 11.1.3 of
As shown by the arrow in the figure, if you quickly step in from one side in the width direction, both elastic thin plates 11 and 13 will curve downward at the stepped part as illustrated in FIGS. 4 and 5, and as a result, The meandering portion 12a of the optical fiber 12 is bent at a portion (13) corresponding to the downwardly curved portion of both elastic thin plates 11.13. In such a case, both elastic thin plates 11°13
Each lower half of is a fixed member] 1. , 15, the local bending action of the meandering a[; 12a described above is effectively and reliably realized. This means that a reduction in the amount of light transmitted from the light emitter 20 to the light receiver 30 due to the locally bent portion of the optical fiber 12, that is, a microbend loss will certainly occur.

When the microbending loss of the optical fiber 12 occurs in this way, the photodiode 31 rapidly decreases the degree of conduction due to the decrease in the amount of light it receives, and in response, the amplifier 41 rapidly increases the amplified voltage Va to 2. At the same time, the summing amplifier 43 suddenly lowers the summing amplified voltage vb to be lower than the reference positive voltage from the reference voltage generator 44, and the comparator 46 generates an output signal. As a result, the heald conveyor makes an emergency stop in response to the output signal from the comparator 46. This allows both elastic thin plates 11. which are located closest to the operator to move from his working position. ．． This means that just by stepping on each part of 13 (14), you can immediately stop δ from 1111 Hel I Conhair. In such a case, optical fiber 1
Since the summing amplified voltage vb from the summing amplifier 43 before the microben F' tFi loss of 2 occurs is stable as described above, the output signal from the comparator 46 will not be generated erroneously. .

After that, when the operator stops pressing on both elastic thin plates 1113, the bent portions of both elastic thin plates 11.13 return to their original shapes due to their elasticity, and the microphone +7 of optical fiber I2
-': Eliminate loss.

Then, the addition amplified voltage vb from the addition amplifier 43 becomes "-
As described above, due to the decrease in the amplified voltage Va from the amplifier 41, the amplified voltage Va rises to a stable state at the low level, and the output signal from the comparator 46 disappears.

In the above embodiment, the meandering part 12a and the straight part 12b were formed by folding back the optical sawply 12, but instead of this, the straight part 121 was also meandered in parallel to the meandering part 12a. Good too.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a side view of the end fiber, FIG. 3 is a detailed circuit diagram of the electric circuit section of FIG. 1, and FIG. FIG. 5 is a perspective view showing a partially opened state of the elastic thin plate, and a sectional view thereof. Explanation of symbols 10... Optical transmission body, 11.13... Elastic thin plate, 12
...Optical fiber, 20... Emitter, 30... Light receiver. Applicant IF Hondenso Co., Ltd. Agent Patent Attorney Teru Hase - 12 Rumors

Claims (1)

[Claims] The first belt is made of an elastic material and is erected in the width direction.
an elastic plate, a second elastic plate formed into a band shape of an elastic material and superimposed on the first elastic plate, and a plurality of times between the first and second elastic plates over the entire overlapping surface of both elastic plates. An optical fiber that is curved and held in place and is locally distorted when both the elastic plates receive a force in their respective width directions and both produce a partial elastic strain, and a a light emitting means for emitting light towards the optical fiber; and a light receiving means for generating a switch signal in response to a change in the light transmitted from the light emitting means through the optical fiber 7 due to a local distortion of the optical fiber. An optical switch device equipped with