JP3063419B2 - Temperature detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting device for optical application for remotely detecting a temperature change of a temperature measuring object as an optical signal.

[0002]

2. Description of the Related Art FIG. 16 shows a conventional example of this type of temperature detecting device.
FIG. In FIG. 16, the temperature detecting device
Is a heat receiving plate 3 attached to the temperature measuring object in a heat conductive manner, and the heat receiving plate 3
The outer peripheral end of the plate 3 is thermally fixed by the mounting seat 3a.
And a spiral bar whose inner peripheral end is connected to the rotating shaft 25.
And a spiral bar connected to the rotating shaft 25.
Driven by the displacement of the metal 23, the high and low positions in the circumferential direction
Two step surfaces 24B _aAnd 24B_cCam consisting of
Rotating cam 24 having a surface, and a cam surface of the rotating cam 24
In response to the stroke of the actuator 16 that slides
An optical switch 15 that changes the output light amount of the optical signal;
The housing 14 includes these components.
The optical switch 15 is a light-emitting optical fiber for external wiring.
A U-shaped conductor extends between the fiber 4 and the receiving optical fiber 5.
The prism 19 forming the optical path and the actuator 16
The light guide path of the gap 20 of the prism 19 in conjunction with the movement
Combined with a light-blocking shutter 21 that is operated to enter and exit
It is.

[0003] Figure 17 is a diagram depicting the operation thereof, if where the measurement object is low, the actuator 16 is located in the lower stepped surface 24B _c of the cam surface of the rotating cam 24, i.e. FIG. 17 (1) In this state, the light-blocking shutter 21 of the optical switch 15 retreats and the optical switch 15
Is on. On the other hand, when the temperature of the temperature measuring object rises, heat is transferred to the spiral bimetal 23 via the heat receiving plate 3, and the bimetal 23 is deformed accordingly, the rotation shaft 25 is driven, and the rotation Fig. 17 (1)
(2) displaced as further exceeds the set temperature detected actuator 16 as shown in FIG. 17 (3) is displaced to a higher step surface 24B _a, light shutter 21 is air-gap portion 20 of the prism 19 Optical switch 1 by blocking light guide path
5 switches off. When the temperature of the temperature measuring object decreases, the spiral bimetal 23 deforms in the opposite direction, and the optical switch 15 returns to the ON state again. The ON / OFF optical signal of the optical switch 15 is output to the photoelectric conversion circuit 8 at a remote location via the light receiving optical fiber 5, and the temperature rise is detected.

FIG. 18 is a perspective view showing the structure of another conventional example. The temperature detecting device shown in FIG. 18 is obtained by adding the set temperature adjusting means and the switch operation displaying means to the temperature detecting device shown in FIG. The set temperature adjusting means is
As shown in FIG. 18, the rotating cam 24 is separated from the rotating shaft 25 connected to the spiral bimetal 23, and is detachable from a disk-shaped clutch plate 26 provided at the shaft end of the rotating shaft 25. It is constituted in. In addition, on the opposing surface of the rotating cam 24 and the clutch plate 26, a tooth row 32 meshing with each other is formed in a ring shape. Reference numeral 27 denotes a rotary cam shaft coupled to the rotary cam 24 so as to be aligned with the rotary shaft 25. The rotary cam 24 is separated from the clutch plate 26 via the rotary cam shaft 27 and pulled up. By turning, the relative position of the rotating cam 24 with respect to the bimetal 23 can be changed. Further, a detected temperature index mark 28 and an operation index mark 30 are marked on the peripheral side surface of the rotary cam 24 as a switch operation display means, and the peripheral side surface of the clutch plate 26, the housing, and the casing correspond to the marks 28 and 30. A set temperature scale 29 and an operation display mark 31 indicating an operation state of a switch on the upper surface of the body 14, respectively.
Is displayed.

In order to change the set value of the detected temperature, the rotating cam 24 is separated from the clutch plate 26 and turned at normal temperature as described above, and the detected temperature index mark 28 is set to the desired temperature of the set temperature scale 29. After joining, the clutch plate 26
To join. As a result, the relative position between the cam surface of the rotary cam 24 and the actuator 16 of the optical switch 15 moves,
The rotation angle of the spiral bimetal 23 for operating the optical switch 15, that is, the detected temperature changes. In addition, by writing a band mark 31 indicating a switch operation range associated with the position of the actuator 16 and the cam surface on the housing 14 side opposite to the operation index mark 30, the light is driven by the displacement of the bimetal 23. When the switch 15 is operated, the operation index mark 30 is set at this position regardless of the set temperature.
Overlaps with the band-shaped mark 31, whereby the temperature detection state can be visually confirmed on site.

FIGS. 20 to 22 show the structure shown in FIG. 18 in more concrete form. That is, FIG.
In FIG. 0 and FIG. 21, the heat receiving plate 3 is attached to the bottom of the housing 14, and the spiral bimetal 2 is provided inside the housing 14.
3, the main components such as the rotating shaft 25, the rotating cam 24, and the optical switch 15 are incorporated, and an adjusting knob 33 for setting the temperature is provided on the upper surface side of the housing 14. The assembling structure is as shown in the exploded view of FIG. 22. In FIG. 22, reference numeral 34 denotes a mounting block for the optical switch 15, and reference numeral 35 denotes a light transmitting and receiving optical fiber 4, 5 connected to the optical switch 15. A bushing 36 for holding the connecting position is a biasing spring for pressing the rotary cam 24 against the clutch plate 26, 37, 38, 39.
Is an assembly bolt, 40 is an adjusting knob 33 for the rotating camshaft 27
Is a fixing pin to be connected to.

[0007]

In the above-described temperature detecting device, when the temperature of the measured object reaches the set detected temperature, the optical switch is turned off and it is detected that the measured object has reached the detected temperature. However, from the viewpoint of preventive maintenance, it is not sufficient to simply monitor whether the detected temperature has been reached, and it is important to monitor changes in temperature, such as temperature rise or temperature drop.

It is an object of the present invention to provide a temperature detecting device which detects that a temperature-measuring object has reached a set detection temperature and can detect a change in the temperature.

[0009]

In order to achieve the above-mentioned object, the present invention relates to a temperature detecting device for detecting a temperature change of a temperature measuring object as an optical signal. A heat receiving plate to be attached, a spiral bimetal whose outer peripheral end is thermally conductively fixed to the heat receiving plate and whose inner peripheral end is coupled to the rotating shaft, and which is connected to the rotating shaft and follows the displacement of the spiral bimetal. A rotary cam, and an optical switch having a light-blocking shutter that opens and closes an optical transmission path between a light emitting optical fiber and a light receiving optical fiber in response to a stroke of an actuator that slides on a cam surface of the rotary cam, A cam surface of the rotary cam has a height in a circumferential direction , wherein the optical switch is connected to a light projecting optical fiber and a light receiving optical fiber, and a photoelectric conversion circuit for detecting an output light amount of an optical signal.
Is formed as a cam having at least three steps that change in steps, and outputs an output signal indicating a transition of a temperature change from the photoelectric conversion circuit in accordance with the output light amount of the optical signal. The cam surface of the rotating cam is composed of low, middle, high and middle step surfaces which are repeated in the circumferential direction,
It may also be adapted to deliver an output signal representative of the transition of the temperature changes in accordance with the output light quantity of the optical signal from the photoelectric conversion circuit
No. The step surfaces of these rotary cams are made of separate members attached on the cam surfaces. Further, the cam surface of the rotary cam has at least three step surfaces whose height changes stepwise in the circumferential direction, and the optical switch has a light-shielding shutter which is displaced by operation of an actuator to switch the output light amount of the optical signal. It has a first and a second light receiving optical fiber, and the photoelectric conversion circuit sends out an output signal indicating a transition of a temperature change in accordance with the output light amount of the first and the second light receiving optical fiber. . The rotary cam includes low, middle, and high step surfaces that are repeated in the circumferential direction. The optical switch includes first and second optical switches that switch the output light amount of an optical signal by a light-shielding shutter that is displaced by operation of an actuator. It has a light receiving optical fiber, and the photoelectric conversion circuit sends out an output signal indicating a transition of a temperature displacement according to an output light amount of the first and second light receiving optical fibers. Further, in the temperature detecting device, the light shielding shutter is provided with an optical signal output light amount adjusting means for equalizing the output light amount of each optical signal of the light receiving optical fiber at a predetermined position. Furthermore so as comprising a setting temperature adjusting means or switching operation display means for visually checking the operation state of the optical switch, variably adjusting the relative position of the rotary cam relative to the spiral bimetal about an axis of rotation.

[0010]

In the temperature detecting device according to the present invention, the cam surface of the rotary cam is formed as at least three steps whose height changes stepwise in the circumferential direction. Changes with an analog signal or a digital signal, and the change in temperature can be monitored. Further, by setting the cam surface of the rotary cam to be high and low step surfaces which are repeated in the circumferential direction, the transition of the temperature change can be monitored from the optical signal output on each step surface. By forming the steps on the cam surfaces of these rotary cams as separate members, they can be attached to necessary places as needed, thereby facilitating manufacture.

Further, the optical switch has first and second light receiving optical fibers whose output light quantity is switched by a light shielding shutter which is displaced by an operation of an actuator, and the photoelectric conversion circuit has first and second light receiving optical fibers. Since the output signal indicating the transition of the temperature change is transmitted in accordance with the output light amount of the optical fiber, for example, when the step of the rotary cam is composed of high, middle and low step surfaces, the first step is performed at the middle step. Since the optical signal is output from both the second optical fiber and the second light receiving optical fiber, the transition of the temperature change can be monitored more reliably. Optical signal output light amount adjusting means for equalizing each output light amount at the middle step of the first and second light receiving optical fibers by adjusting the relative position of the optical switch and the rotary cam is provided. The level with respect to the threshold value of the fiber is increased, and the reliability is improved.

Further, since a set temperature adjusting means is provided so that the rotary cam can be adjusted around the rotary shaft relative to the spiral bimetal, the setting of the detected temperature is facilitated.
The switch operating means is, for example, provided with a mark indicating the operation state of the optical switch, facing the rotating cam and the housing, and displaying this mark in a position associated with the operation of the optical switch in advance. Thus, the operation of the optical switch, that is, the operation of the temperature detection device can be visually confirmed at the installation site.

[0013]

FIG. 1 is a structural perspective view showing an embodiment of a temperature detecting device according to the present invention. The temperature detecting device of the present invention shown in FIG. 1 differs from the conventional temperature detecting device shown in FIG. 16 in that the cam surface of the rotary cam 24 is replaced with a circumferentially high and low stepped surface. The point is that it is composed of an inclined surface 24A whose height changes linearly in the direction.

FIG. 2 is a side view of a main part of the rotary cam 2.
Retracted in contact with the position of the side 24A _c low potential of the fourth cam surfaces, sequential high side 24A _a when the temperature of the measurement object is increased
To move forward. FIG. 3 shows its operating characteristics. The rotating cam 24 is driven by the rise of the temperature of the temperature measuring object, and the actuator 16 moves forward, so that the light-shielding shutter 21 enters the light guide path of the gap 20 of the prism 19 and the optical signal. The output light quantity of falls continuously as the temperature of the temperature measuring object rises. Accordingly, by setting the detected temperature within this temperature range, it is possible to detect that the temperature-measured body has reached the detected temperature and to detect a change in the temperature.

FIG. 4 shows an example of a photoelectric conversion circuit for converting such an analog optical signal into a digital electric signal for computer processing, for example. The circuit 8 can be used. In FIG. 4, the photoelectric conversion circuit 7 includes a light emitting element 71A whose internal circuit is omitted, a light emitting circuit 71 for emitting a fixed amount of pulse light to the light emitting optical fiber 4, and a light receiving light. The light receiving circuit 72 receives an optical signal from the fiber 5 and outputs an electric signal. The light receiving circuit 72 includes a light receiving element 72A that receives an optical signal from the light receiving optical fiber 5, an amplifier circuit 72B for the output of the light receiving element 72A, and a differential circuit including a series circuit of a resistor and a capacitor for differentiating the output of the amplifier circuit 72B. Circuit 7
2L and comparison circuits 72C and 72E each having a + input terminal connected to the output side of the differentiating circuit 72L.
A reference voltage circuit 72D connected to the negative output terminal of the comparison circuit 72C, a detection circuit 72G and an output circuit 72I connected in series to the output terminal of the comparison circuit 72C,
It comprises a reference voltage circuit 72F connected to the negative input terminal of the comparison circuit 72E, and a detection circuit 72H and an output circuit 72K connected in series to the output terminal of the comparison circuit 72E.

The operation of the photoelectric conversion circuit 7 is based on the light emitting circuit 7
An optical fiber 4 for projecting light of a pulse light of a constant light quantity from 1
(Normally, to prevent the effects of disturbance light,
A pulse light composed of a predetermined pulse train is used). This
Light passes through the optical sensor 15 and becomes a light signal as an optical signal for light reception.
Returning to step 5, the light is converted into an electric signal by the light receiving element 72A.
You. The output of the light receiving element 72A is amplified by the amplifier circuit 72B.
Disturbance light and dark current of the light receiving element 72A in the differentiating circuit 72L
Cuts DC components as noise. This differentiating circuit 72
The output of L is input to comparison circuits 72C and 72E, respectively.
And the power supply voltage of each of the reference voltage circuits 72D and 72F.
V_pOf each reference voltage V obtained by dividing_a, V_bCompared with
It is. Now, the reference voltage V_a, V_bIs the temperature of the temperature measuring object in FIG.
T_a, T_bIf you decide to correspond to, for example,
Body temperature T is T_bIf lower, output light quantity of optical signal
Is the reference voltage V_bThe comparison circuit is larger than the one corresponding to
Both 72C and 72E output a signal of "1",
These output signals are emitted by the detection circuit 72G or 72H.
Is it equal to the pulse train of the pulsed light emitted from the circuit 71
It is determined whether or not it is output via the output circuits 72I and 72K.
Terminal S₁, S_TwoOutput "1" signals from
You. The temperature T of the temperature measuring object rises and the temperature becomes T_bAnd T _aof
When they are in the middle, the comparison circuit 72C is "1" and the comparison circuit 72E is
Since the signal of "0" is output, the output terminal S₁Is "1", out
Force terminal S_TwoOutputs a signal of “0”. In addition,
The temperature rises and the temperature rises to T_aIs exceeded, the comparison circuit 72
C and 72E both output a "0" signal, and output terminals
S₁, S_TwoOutput a signal of "0". table
1 indicates the relationship between these signal outputs, and the signal terminal S₁, S
_TwoThe transition of the temperature can be detected from the combination of the output conditions.

[0017]

[Table 1] FIG. 5 is a side view of a main part showing a different embodiment of the present invention.
The embodiment shown in FIG. 5 is different from the embodiment shown in FIG. 1 in that the cam surface of the rotary cam 24 has at least three step surfaces 24B whose height changes stepwise in the circumferential direction.
It consists of a step surface of the step. In this embodiment, as shown in the operation characteristic diagram of FIG. 6, optical signals of digital signals corresponding to five stages of temperatures are output. The rotating cam 24
The number of steps of the step surface 24B of the cam surface is required to be at least three steps, and at two steps, the optical sensor simply displays ON / OFF.

FIG. 7 is a view for explaining the operation of a further different embodiment of the present invention, including a side surface of a main part. The difference between the embodiment shown in FIG. 7 and the embodiment shown in FIG. 5 is that, as shown in FIG. 7 (1), the optical switch 15 is provided with an optical fiber 4 for external wiring and an optical fiber for light reception (hereinafter referred to as a first optical fiber). A prism 19 having a U-shaped light guide path extending between the light-receiving optical fibers 5, a light-shielding shutter 21 having a deflecting / reflecting surface 21 </ b> A formed at the front end thereof, and An actuator 16 that moves in and out of the light guide path 20 and a second light-receiving optical fiber 6 that receives light from the deflecting / reflecting surface of the light-shielding shutter 21 are provided. The point is that the output light quantities of the optical signals transmitted to 5, 6 change contradictoryly. In addition, in FIG.
The cam surface of No. 4 has a high position where the height changes stepwise in the circumferential direction.
Middle, low three-stage step surface 24B _a, 24B _b, 24B _c
Consists of

The operation of the temperature detecting device will be described with reference to the operation explanatory diagram of FIG. 7 and the operation characteristic diagram of FIG. Here, if the temperature of the temperature measuring object is low, the actuator 16 is moved to the lower step surface 24 of the cam surface of the rotating cam 24 as shown in FIG.
The position of the B _c and retracted in contact, the output light amount of the first optical signal of the light-receiving optical fiber 5 is large, the output light intensity of the second optical signal of the light receiving optical fiber 6 is small. When the temperature of the temperature measuring object rises, the actuator 16 moves as shown in FIGS.
Displaced successively moderate, high stepped surface 24B _b, the 24B _a like, because advances in accordance with the displacement, the output light intensity of the first light-receiving optical fiber 5 is reduced, the second light-receiving optical fiber 6 Output light quantity increases. When the actuator 16 is displaced to the position of the stepped surface 24B _b medium is outputted optical signal from both the first and the light-receiving optical fiber 5 and the second light-receiving optical fiber 6, the actuator 16 is high step surface 24B When displaced to the position _a , the output light quantity of the first light receiving optical fiber 5 is small and the second light receiving optical fiber 6
Output light amount becomes large. Now, the low and high step surface 24B _c and 24B _a as shown in FIG. 8, the respective temperature T of the temperature sensing element is determined so as to correspond to T _b and T _a, the output relationship of those optical signals Is as shown in Table 2 and the transition of the temperature can be detected.

[0020]

[Table 2] In Table 2, when the temperature T of the measured object is _Ta >T> _Tb , both the first light receiving optical fiber 5 and the second light receiving optical fiber 6 output optical signals, These first
The output light quantity of the second light receiving optical fibers 5 and 6 needs to exceed the threshold value J as shown in FIG. Therefore, the actuator 16 has the middle step surface 24B _b
If the output light amounts are adjusted so that they become the same when both are displaced, the margin for the threshold value increases for both output light amounts. It is desirable to increase the margin as described above in order to compensate for optical loss that occurs when an optical signal is transmitted over a long distance through an optical fiber. 9, the conventional temperature detecting device shown in FIG. 21, when the actuator 16 is displaced in stepped surface 24B _b medium, equal the first and second output light amount of the light-receiving optical fiber 5 and 6 FIG. 9 shows an example in which an optical signal output light amount adjusting means for adjusting the optical signal output light amount is provided. In FIG. The above-described object can be achieved by adjusting the relative position between the rotary cam 24 and the optical switch 15 by moving the adjusting screw 42 in the vertical direction. Although not shown, the object can be similarly achieved by configuring the optical switch 15 so as to be movable up and down as a different example.

FIG. 10 is a side view of a principal part showing still another embodiment of the present invention. Embodiment shown in FIG. 10 is high and low step surface 24B _a and 24B _c cam face of the rotary cam 24 is repeated in the circumferential direction in the embodiment shown in FIG. 5
These step surfaces correspond to predetermined temperature intervals around the detected temperature, respectively. In the figure, the number of times the optical switch 15 is turned off is counted by a higher-level controller, whereby
The transition of the detected temperature and the temperature change can be detected from the count number.

It should be noted that the count does not correspond to the temperature rising direction.
Figure 1 shows an example for judging whether the object is in the descending direction.
11 is shown. FIG. 11 shows yet another embodiment of the present invention.
It is a principal part side view. The embodiment shown in FIG.
In the embodiment, the cam surface of the rotary cam 24 is turned in the circumferential direction.
Returned high, medium, low and medium step surfaces 24
B _a, 24B_b, 24B_cAnd 24B_bConsisting of
These step surfaces are each detected at the detected temperature.
Detected temperature by corresponding to a predetermined temperature interval centered on
Changes in degree and temperature change can be detected.

In the figure, when the actuator 16 is located on the middle step surface 24Bb, the signal outputs of the first and second light receiving optical fibers 5 and 6 are "1" and "1". The signal outputs of the first and second light receiving optical fibers 5 and 6 in the state, that is, "0" and "1" when the actuator 16 is on the higher step surface 24Ba, and when the actuator 16 is on the lower step surface 24Bc. Is "1"
From the displacement of “0”, it can be determined whether the temperature is in the rising direction or the falling direction.

FIGS. 12 and 13 are side views of a main part showing still another embodiment of the present invention. The embodiment shown in FIGS. 12 and 13 is different from the embodiment shown in FIGS. 10 and 11 in that the high and low steps or the high, middle, low and middle steps are separate members 43 respectively.
And 44, and these members are attached to the cam surface of the rotating cam 24 by, for example, pins 43A and 44A, respectively. By forming the step surface with a separate member in this way, the step surface can be attached to a necessary portion as needed, thereby facilitating the production.

FIGS. 14 and 15 are perspective views showing the structure of still another embodiment of the present invention, and FIGS. 1, 2, 5, 5, 7, 9, 10, 11, 12, and 13 are provided. In each of the embodiments described above, a switch operation display means for visually confirming the operation states of the set temperature adjusting means and the optical switch is provided. FIG. 14 corresponds to the one shown in FIG. 1 in which the cam surface of the rotary cam 24 has an inclined surface 24A for easy understanding. These set temperature adjustment means and switch operation display means are shown in FIGS.
This is the same as the conventional one shown in FIG. These make it easier to set the detected temperature, and the temperature detection state can be visually checked on site.

[0026]

According to the temperature detecting device of the present invention, the cam surface of the rotating cam on which the actuator slides is raised in the circumferential direction .
The temperature measurement object is made up of three or more steps that change in steps, high and low steps repeated in the circumferential direction, high, middle, low and medium steps. , And a change in the temperature change can be detected, so that the temperature can be monitored with high reliability from the viewpoint of preventive maintenance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of a temperature detecting device according to the present invention.

FIG. 2 is a side view of a main part of FIG. 1;

FIG. 3 is an operating characteristic diagram of the temperature detecting device of the present invention shown in FIG.

FIG. 4 is a circuit diagram showing an example of a photoelectric conversion circuit connected to the temperature detection device of the present invention shown in FIG.

FIG. 5 is a side view of a main part showing another embodiment of the temperature detecting device of the present invention.

FIG. 6 is an operating characteristic diagram of the temperature detecting device of the present invention shown in FIG. 5;

FIG. 7 is an operation explanatory diagram including a main part side surface showing a further different embodiment of the temperature detecting device of the present invention.

FIG. 8 is an operating characteristic diagram of the temperature detecting device of the present invention shown in FIG. 7;

FIG. 9 is a sectional view of the temperature detecting device of the present invention shown in FIG. 7;

FIG. 10 is a main part side view showing still another embodiment of the temperature detecting device of the present invention.

FIG. 11 is a side view of a main part showing still another embodiment of the temperature detecting device of the present invention.

FIG. 12 is a main part side view showing still another embodiment of the temperature detecting device of the present invention.

FIG. 13 is a side view of a main part showing still another embodiment of the temperature detecting device of the present invention.

FIG. 14 is a configuration perspective view showing still another embodiment of the temperature detecting device of the present invention.

FIG. 15 is a side view of a main part of FIG. 14;

FIG. 16 is a configuration perspective view showing an example of a conventional temperature detection device.

FIG. 17 is an operation explanatory diagram of the conventional temperature detecting device shown in FIG.

FIG. 18 is a configuration perspective view showing a different example of the conventional temperature detection device.

FIG. 19 is a side view of a main part of FIG. 18;

FIG. 20 is a perspective view of an embodiment in which the configuration of the conventional temperature detection device shown in FIG. 18 is further embodied;

21 is a sectional view of FIG. 20.

FIG. 22 is an exploded perspective view of FIG. 20;

[Explanation of symbols]

Reference Signs List 3 heat receiving plate 4 light emitting optical fiber 5 light receiving optical fiber, first light receiving optical fiber 6 second light receiving optical fiber 8 photoelectric conversion circuit 15 optical switch 16 actuator 19 prism 21 light shielding shutter 21A deflection reflection surface 24 rotation cam 24A inclined surface (cam surface) 24B stepped surface (cam surface) 24B _a high step surface (cam surface) stepped surface 24B _b medium (cam surface) 24B _c lower stepped surface (cam surface ) 25 Rotation axis 26 Clutch plate 28 Detected temperature index mark (of set temperature control means) 29 Set temperature scale (of set temperature control means) 30 Operation index mark (of switch operation display means) 31 Operation display mark (switch operation display means) ) 42 Adjusting screw (optical signal output light amount adjusting means) 43 member 44 member

Claims (8)

(57) [Claims] 1. A temperature detecting device for detecting a temperature change of a temperature measuring object as an optical signal, wherein the heat receiving plate is attached to the temperature measuring object so as to conduct heat, and an outer peripheral end of the heat receiving plate is connected to the heat receiving plate. , A spiral bimetal having an inner peripheral end coupled to a rotating shaft, a rotating cam connected to the rotating shaft and driven by the displacement of the spiral bimetal, and an actuator sliding on a cam surface of the rotating cam. An optical switch having a light-blocking shutter that opens and closes an optical transmission path between a projecting optical fiber and a receiving optical fiber in response to the stroke of the optical switch, and the optical switch is connected to the projecting optical fiber and the receiving optical fiber. And a photoelectric conversion circuit for detecting the output light amount of the optical signal, the cam surface of the rotating cam has a height in the circumferential direction.
The cam is formed as a cam having at least three steps that change in a stepwise manner, and outputs an output signal representing a transition of a temperature change from the photoelectric conversion circuit in accordance with an output light amount of an optical signal. Temperature detector. 2. A temperature detecting device for detecting a temperature change of a temperature measuring object as an optical signal, wherein the heat receiving plate is mounted on the temperature measuring object so as to conduct heat, and an outer peripheral end of the heat receiving plate is connected to the heat receiving plate. , A spiral bimetal having an inner peripheral end coupled to a rotating shaft, a rotating cam connected to the rotating shaft and driven by the displacement of the spiral bimetal, and an actuator sliding on a cam surface of the rotating cam. An optical switch having a light-shielding shutter having a front end as a reflecting surface that opens and closes an optical transmission path between a light emitting optical fiber and a light receiving optical fiber in response to a stroke of
In a temperature detecting device comprising a photoelectric conversion circuit connected to the optical fiber for light emission and the optical fiber for light reception and connected to the optical switch, the cam surface of the rotary cam has a height in a circumferential direction. The optical switch includes first and second light receiving optical fibers, each of which has at least three steps that change in a stepwise manner and whose output light amount of an optical signal is switched by a light-shielding shutter that changes by operating an actuator. A temperature detecting device, wherein the conversion circuit sends an output signal indicating a transition of a temperature change in accordance with an output light amount of the first and second light receiving optical fibers. 3. A temperature detecting device for detecting a temperature change of an object to be measured as an optical signal, comprising: a heat receiving plate which is heat-conductively attached to the object to be measured; , A spiral bimetal having an inner peripheral end coupled to a rotating shaft, a rotating cam connected to the rotating shaft and driven by the displacement of the spiral bimetal, and an actuator sliding on a cam surface of the rotating cam. An optical switch having a light-blocking shutter that opens and closes an optical transmission path between a projecting optical fiber and a receiving optical fiber in response to the stroke of the optical switch, and the optical switch is connected to the projecting optical fiber and the receiving optical fiber. And a photoelectric conversion circuit for detecting the output light amount of the optical signal, wherein the cam surface of the rotating cam comprises high and low step surfaces repeated in the circumferential direction, and the optical signal from the photoelectric conversion circuit Temperature detecting apparatus characterized by delivering an output signal representative of the transition of the temperature change in response to a force amount. 4. A temperature detecting device for detecting a temperature change of an object to be measured as an optical signal, comprising: a heat receiving plate which is thermally conductively attached to the temperature measuring object; , A spiral bimetal having an inner peripheral end coupled to a rotating shaft, a rotating cam connected to the rotating shaft and driven by the displacement of the spiral bimetal, and an actuator sliding on a cam surface of the rotating cam. An optical switch having a light-shielding shutter having a front end as a reflecting surface that opens and closes an optical transmission path between a light emitting optical fiber and a light receiving optical fiber in response to a stroke of
In the temperature detecting device, the optical switch includes a photoelectric conversion circuit connected to the light projecting optical fiber and the light receiving optical fiber for detecting the output light amount of the optical signal. The optical switch has first and second light receiving optical fibers in which the output light amount of an optical signal is switched by a light-blocking shutter that is changed by operation of an actuator. A temperature detecting device for transmitting an output signal indicating a transition of a temperature change according to an output light amount of a first and a second light receiving optical fibers. A temperature detecting apparatus according to any of the claims 5] claims 1 to 4, the stepped surface of the rotating cam temperature detecting apparatus characterized by comprising a member of another body mounted on the cam surface . A temperature detecting apparatus according to any of the claims 6] claims 1 to 4, each of the optical signals output light amount adjustment to equalize the output light amount of the optical signal of the light-receiving optical fiber light shutter is in a predetermined position A temperature detecting device comprising means. A temperature detection device according to any one of claims 7] claims 1 to 4, further comprising a setting temperature adjusting means for variably adjusting the relative position of the rotary cam relative to the spiral bimetal rotation axis around Characteristic temperature detecting device. A temperature detection device according to any one of claims 8 claims 1 to 4, the temperature detection device is characterized in that a switch operation display means for visually checking the operation state of the optical switch.