JPH08329801A - Automatic contact making/breaking device of photoelectric type - Google Patents

Abstract

PURPOSE: To allow a second thermo-actuating member to accurately work in compliance with the change in the ambient temp. by furnishing a temp. suppressing member to suppress temp. rise of a spring member which performs opening and closing of electrode. CONSTITUTION: When the illuminance of the surrounding area of an automatic contact making/ breaking device 1 of photoelectric type rises, the electric conductivity of a photoelectric element 3 increases to cause increase in the amperage, which results in enlargement of the heat emission quantity of a heat emitting body 4. This causes a rise of the peripheral temp. together with the heat emitting body 4, and the first thermo-actuating member 5 makes displacement in association with the temp. rise, and its other end 5b presses a detent piece 8b of a spring member 6 through a coupling screw 14. The moving distance of this spring member 6 increases with the displacement of the detent piece 8b, and a movable contact 7 separates from a stationary contact 17 when the moving distance exceeds the specified value, and feed of the load current is stopped. At this time, besides the second thermo- actuating member 13 which corrects the thermal error of the moving distance of the first member 5, a temp. suppressing member 11 is furnished which consists of an electric conductive part 12 made from braided conductor for bypassing the current flowing through the spring 6, and thereby the temp. rise in the spring member 6 is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric automatic contact opening / closing device for opening and closing contacts according to the ambient illuminance.

[0002]

2. Description of the Related Art Conventionally, this type of photoelectric automatic contact switching device
One is shown in Fig. 14. This is, for example, a device that is installed in a vending machine or the like and turns off the internal lighting when the surroundings become bright.The photoelectric element 3 for detecting illuminance and the detected illuminance of the photoelectric element 3 are used. It has a heating element 4 whose heat generation state changes, a first thermal response member 5 which is displaced in response to a temperature change due to heat from the heating element 4, and a movable contact 7, and is linked to the displacement of the first thermal response member 5. When the movable contact 7 is displaced and the moving distance exceeds a predetermined value, the movable contact 7 operates to open or close the fixed contact 17, and
A second thermal responsive member 13 for determining the relative position of the spring member 6 with respect to the first thermal responsive member 5 and for correcting the error due to the temperature of the movement distance of the spring member 6 by the first thermal responsive member 5.
And have.

The operation of this device will be described below. As the surrounding illuminance increases from night to morning, photoelectric devices
The electric conductivity of 3 becomes high, and the heat generation amount of the heating elements 4 connected in series becomes large. Then, the temperature of the heating element 4 gradually rises, and the displacement amount of the first heat responsive member 5 increases,
When the spring member 6 connected to the first heat responsive member 5 is gradually displaced and its moving distance exceeds a predetermined value, the movable contact 7 opens with respect to the fixed contact 17. On the other hand, from the evening to the night, the movable contact 7 is closed with respect to the fixed contact 17 by operating in reverse to the above. Also, since the operating state of the first heat responsive member 5 changes depending on the ambient temperature such as the ambient temperature, the second heat responsive member 5
Reference numeral 13 corrects the operation of the first heat responsive member 5 by displacing in accordance with the change in ambient temperature.

[0004]

The photoelectric automatic contact opening / closing device described above is convenient because it automatically detects ambient illuminance to open / close the contact consisting of the movable contact and the fixed contact. By the way, in recent years, along with the miniaturization of the photoelectric automatic contact opening / closing device, the spring member and the like tend to be made compact. When the spring member is made compact, when the rated current flowing through the contact has a large value such as 6 A or 10 A, heat generation of the spring member having the movable contact increases,
As a result, the temperature rise of the second heat responsive member arranged near the spring member may increase. When the second heat responsive member is displaced by the temperature rise due to the spring member, the original second
It becomes difficult to accurately correct the operation of the first heat responsive member 5 due to the ambient temperature such as the ambient temperature, which is the purpose of the heat responsive member.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide a photoelectric automatic contact opening / closing device having good contact opening / closing accuracy depending on the illuminance regardless of the current value flowing through the contact. Is.

[0006]

In order to solve such a problem, in the photoelectric automatic contact switching device according to claim 1, a photoelectric element for detecting illuminance and a heat generation state according to the detected illuminance of the photoelectric element are provided. A heating element that changes, a first thermoresponsive member that displaces in response to a temperature change due to heat from the exothermic body, and a movable contact that is displaced in conjunction with the displacement of the first thermoresponsive member and has a predetermined moving distance. And a first heat responsive member of the spring member that determines the relative position of the spring member to the first heat responsive member and the spring member that operates so that the movable contact opens or closes the fixed contact. In a photoelectric automatic contact opening / closing device having a second heat responsive member that corrects an error in the moving distance due to temperature, a temperature suppressing member that suppresses a temperature rise of the spring member is provided.

According to a second aspect of the present invention, there is provided a photoelectric automatic contact opening / closing device in which the temperature suppressing member according to the first aspect is formed by a conductive portion that bypasses a current flowing through a spring member other than the movable contact.

According to a third aspect of the present invention, in the photoelectric type automatic contact opening / closing device, the spring member according to the second aspect is pushed at one end by a substantially flat plate-like attachment piece and at the other end by the first heat responsive member. A substantially square-shaped main body portion having a substantially flat plate-shaped engaging piece, and two substantially long flat plate-shaped first connecting pieces that connect the attaching piece and the engaging piece and are arranged side by side. , A substantially flat plate-like member having a substantially U-shape formed by the second connecting piece and the facing piece, wherein a movable contact is attached to the second connecting piece, and one end of the facing piece is joined to the engaging piece of the main portion. First
It is formed so as to have a reversal portion arranged between the connection pieces and a substantially elongated flat plate-shaped compression portion that is attached to the second connection piece of the reversal portion and that is locked to the second heat responsive member. At the same time, the conductive portion is formed so as to bypass the facing piece of the inversion portion of the spring member.

According to a fourth aspect of the present invention, there is provided a photoelectric type automatic contact opening / closing device in which the conductive portion according to the third aspect is formed so as to connect the second connecting piece of the reversing portion of the spring member and the main body portion.

According to a fifth aspect of the present invention, there is provided a photoelectric type automatic contact opening / closing device in which the conductive portion according to the third aspect is connected to the compression portion of the spring member and a portion other than the spring member and electrically connected to the spring member. It is configured as described above.

According to a sixth aspect of the present invention, there is provided a photoelectric automatic contact opening / closing device according to any one of the first to fifth aspects, wherein a current adjusting member for adjusting a current flowing through the heating element is provided. .

According to a seventh aspect of the present invention, there is provided a photoelectric automatic contact opening / closing device in which the current adjusting member according to the sixth aspect is formed of a variable resistor and is arranged in series with a heating element.

[0013]

According to the structure of claim 1, even when the value of the current flowing through the contact is large, the temperature suppressing member can suppress the temperature rise of the spring member. More accurate response to changes.

According to the structure of claim 2, in addition to the effect of claim 1, by bypassing the current flowing through the spring member through the conductive portion, heat generation of the spring member is suppressed and the temperature rise. Since it is suppressed, the temperature rise of the spring member can be surely suppressed.

According to the structure of claim 3, in addition to the effect of claim 2, the opposing piece of the spring member is arranged between the first connecting pieces and is a substantially U-shaped flat plate. Since it has two narrow pieces and has a narrow cross-sectional area through which the current passing through the movable contact flows, the temperature rise of the spring member can be suppressed more reliably by bypassing the current by the conductive portion.

According to the structure of claim 4, in addition to the effect of claim 3, the conductive portion is formed so that the current flows from the second connecting piece of the reversing portion of the spring member to the main body portion. The conductive portion can be formed integrally with the spring member.

According to the structure of claim 5, in addition to the function of claim 3, the conductive portion is provided so that current flows from the compression portion of the spring member to a portion other than the spring member and electrically connected to the spring member. Since it is formed, it is possible to suppress heat generation in a portion other than the spring member and suppress an increase in temperature thereof.

According to the structure of claim 6, in addition to the effect of any one of claims 1 to 5, the current flowing through the heating element can be adjusted by the current adjusting member. The illuminance at which the contacts open and close can be adjusted.

According to the structure of claim 7, in addition to the effect of claim 6, the current flowing through the heating element can be adjusted by the variable resistance, so that the illuminance at which the contact opens and closes can be easily adjusted. is there.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a photoelectric automatic contact switchgear 1 according to the present invention.
The support base 2, the photoelectric element 3, the heating element 4, the first thermal response member 5, the spring member 6, the temperature suppressing member 11, and the second thermal response member 13 are the main constituent members. The members having the same basic functions as those described in the conventional example are designated by the same reference numerals.

The support base 2 includes a photoelectric element 3 and a first thermoresponsive member.
5, which supports the spring member 6, the second heat responsive member 13, and the like, and is made of resin, and has an upper surface 2a, a lower surface 2b, side surfaces 2c, 2c ...
Is formed into a substantially rectangular parallelepiped shape.

The photoelectric element 3 detects the illuminance of the surroundings and is formed of, for example, CdS (cadmium sulfide) whose electric conductivity increases as the illuminance increases. The photoelectric element 3 is arranged in series between a first terminal, which will be described later, and the heating element 4, and is fixed to the upper surface 2a of the support base 2.

The heating element 4 has a heating state that changes according to the illuminance detected by the photoelectric element 3, and includes a heating body 4a made of a resistance material and a lead wire terminal for supplying a current to the heating body 4a.
4b and 4c, and generate heat as the value of the current flowing through the heat generating body 4a increases. This heating element 4 has one lead wire terminal 4b connected to the photoelectric element 3 so as to be arranged in series with the photoelectric element 3.
And the other lead wire terminal 4c is connected to a first heat responsive member 5 described later, and the heat generating body 4a is arranged in the vicinity of the first heat responsive member 5.

The first heat responsive member 5 is displaced in accordance with the temperature change due to the heat generation of the heating element 4, and is formed of a substantially long plate-shaped bimetal. One end 5a of the first heat responsive member 5
Is a second terminal, a spring member 6,
It is connected to the second heat responsive member 13 and is fixed to the support base 2. The other end 5b is a free end that maximizes the displacement in the direction toward the spring member 6 as the temperature rises, and has a female screw-shaped screwing portion 5c into which a connecting screw described later is screwed. Further, a connection portion 5d to which the other lead wire 4c of the heating element 4 is connected is provided at a substantially intermediate position between the one end 5a and the other end 5b.

The spring member 6 has a movable contact 7 and is displaced in association with the displacement of the first heat responsive member 5
Reference numeral 7 denotes an opening / closing operation of a fixed contact which will be described later, and as shown in FIGS. 4 and 5, it is formed of a conductive material into a substantially flat plate shape. Specifically, a substantially flat plate-shaped attachment piece 8a is provided at one end, and a substantially flat plate-shaped engagement piece 8 is pushed by the first heat responsive member 5 at the other end.
b, a substantially rectangular main body 8 for connecting the attachment piece 8a and the engagement piece 8b, and having two substantially elongated flat plate-like first connection pieces 8c, 8d , The second connecting piece 9a and the facing pieces 9b, 9c are substantially U-shaped, and the movable contact 7 is attached to the second connecting piece 9a, and the first connecting pieces 8c, 8d. One end of the facing pieces 9b, 9c is located between the engaging pieces 8b of the main body 8
From the second connecting piece 9a of the reversing part 9 so that the other end 10b of the reversing part 9 is connected to the second heat responsive member described later. And a part 10.

Further, the main body portion 8 has a mounting hole 8e for attaching to a connecting member which will be described later in the attaching piece 8a, and is bent and formed at the outer ends of the first connecting pieces 8c and 8d. It has bent pieces 8f and 8g. Further, as shown in FIG. 5, the compression portion 10 is bent so as to have a predetermined angle with respect to the main body portion 8. This spring member 6 has its attachment piece 8a connected to the connecting member through the attachment hole 8e and connected to the second terminal, the first heat responsive member 5 and the second heat responsive member 13 as well as the first heat responsive member. Support stand 2 so that it can be installed side by side with member 5 with a certain space
Fixed to. Then, when the engaging piece 8b of the main body portion 8 is pushed by the first thermal response member 5 and the moving distance exceeds a predetermined value, the movable contact 7 operates so as to open or close the fixed contact.

The temperature suppressing member 11 suppresses the temperature rise of the spring member 6, and is formed of a conductive portion 12 that bypasses the current flowing through the spring member 6 except the movable contact 7. This conductive portion 12 is formed of a braided wire, and has one end
12a is attached to the point A of the second connecting piece 9a of the spring member 6 and the other end 12b is attached to the point B of the first connecting piece 8c of the main body 8 by soldering and the other portions are attached to the spring member 6 and the like. It is arranged so as not to contact. Therefore, the bypass circuit shown by the broken line in FIG. 6 is obtained. The cross-sectional area of the braided wire forming the conductive portion 12 is about several times as large as the cross-sectional area of the facing pieces 9b and 9c of the spring member 6.

The second heat responsive member 13 corrects the operation of the first heat responsive member 5, and is formed of a substantially long plate-shaped bimetal. One end 13a of the second heat responsive member 13 has a second lead wire, a first heat responsive member 5,
It is connected to the spring member 6 and fixed to the support base 2. The other end 13b is a free end that maximizes the displacement in the direction opposite to the spring member 6 as the temperature rises, and has a locking portion 13c that is bent in a substantially V shape toward the spring member 6. This locking portion 13c is the other end 10 of the compression portion 10 of the spring member 6.
b is locked, and is provided at a position where the compression portion 10 is slightly curved. The second heat responsive member 13 is the first member of the spring member 6.
The relative position to the heat responsive member 5 is determined by locking the other end 10b of the compression portion 10 of the spring member 6 to the locking portion 13c, and the error due to the temperature of the moving distance of the spring member 6 by the first heat responsive member 5 is determined. To correct. That is, the second heat responsive member 13 is displaced in the same direction as the first heat responsive member 5 in response to an increase in ambient temperature, and the moving distance of the spring member 6 by the first heat responsive member 5 becomes relatively small. Then, the spring member 6 is displaced.

Reference numeral 14 is a connecting screw, which is the other end of the first thermoresponsive member 5.
5b and the engagement piece 8b of the main body 8 of the spring member 6 are connected. Specifically, the connecting screw 14 is of a male screw shape, and has a structure in which the connecting screw 14 is screwed with the screwing portion 5c of the other end 5b, and the one end 14a presses the engaging piece 8b. Other end 5b and engaging piece
You can change the distance of 8b.

Reference numeral 15 is a connecting member for fixing the first heat responsive member 5, the spring member 6 and the second heat responsive member 13 at predetermined positions and electrically connecting them to the second lead wire. Formed by bending a metal plate, the support base 2
Is held. At the end of the connecting member 15, the connection terminal 15
The connecting member 15 having a
Embedded in.

Reference numeral 16 is a fixed terminal, which is a substantially long flat plate,
A fixed contact 17 facing the movable contact 7 is provided at one end 16a, and the other end is held by the support base 2 and connected to a third lead wire described later. The fixed terminal 16 does not conduct with the connecting member 15 or the like. Reference numeral 18 denotes a first terminal, which is in the shape of a substantially long flat plate, one end of which is connected to the photoelectric element 3 and the other end of which is held by the support base 2 and is also connected to a first lead wire described later.

Reference numeral 19 denotes a first lead wire, one end of which is connected to the first terminal 18 inside the support base 2 and the other end of which protrudes from the lower surface 2b of the support base 2. Reference numeral 20 denotes a second lead wire, one end of which is connected to the connecting member 15 inside the support base 2 and the other end of which protrudes from the lower surface 2b of the support base 2. Reference numeral 21 denotes a third lead wire, one end of which is connected to the fixed terminal 16 inside the support base 2,
The other end projects from the lower surface 2b of the support base 2. Reference numeral 22 denotes a casing, which is made of a transparent resin and has a bottomed cylindrical shape capable of accommodating the first heat responsive member 5 and the like, and an end portion of the casing is a side surface 2c, 2 of the support base 2.
It is attached to c ... Further, in FIG. 6, 23 is a power source, and 24
Is a load such as lighting.

Next, the operation of the photoelectric automatic contact switching device 1 will be described. First, photoelectric automatic contact switchgear 1
Is installed in a place where the illuminance is desired to be detected, and the first lead wire 19 and the second lead wire 20 are connected to the power supply 23, and the first lead wire 19 and the third lead wire 21 are connected to the load 24. In this state, if both movable and fixed contacts 7 and 17 are closed,
The current supplied from 23 to the load 24 is mainly the connecting member 15, the spring member 6, the conductive portion 12 as the temperature suppressing member 11, and the movable contact.
7 and fixed contact 17. Further, a current also flows from the power source 23 to the photoelectric element 3 and the heating element 4.

Now, for example, when the illuminance around the photoelectric automatic contact switchgear 1 increases, the electrical conductivity of the photoelectric element 3 increases and the amount of current increases, so that the heating value of the heating element 4 connected in series increases. growing. When the heating value of the heating element 4 increases and the temperature of the heating element 4 and its surroundings rises, the first heat responsive member
5 is displaced as the temperature rises, and the other end 5b is
The engaging piece 8b of the spring member 6 is pressed via. Spring member 6
The moving distance increases with the displacement of the engaging piece 8b, and when the moving distance exceeds a predetermined value, the movable contact 7 opens with respect to the fixed contact 17. As a result, the supply of current to the load 24 is stopped. On the other hand, when the illuminance around the photoelectric automatic contact switchgear 1 becomes low, the movable contact 7 operates in the reverse order to the fixed contact.
Close to 17

Further, when the ambient temperature such as the air temperature rises, the second heat responsive member 13 will increase in temperature with the increase of the temperature.
By displacing in the same direction as 5, the spring member 6 having the compression portion 10 that is locked to the locking portion 13c is displaced, and the moving distance of the spring member 6 by the first thermal response member 5 is relatively small. Then, the ambient temperature is corrected.

On the other hand, from the cross-sectional area of the opposing pieces 9b, 9c, the conductive portion 11
Since the cross-sectional area of the spring is quite large, almost no current flows through the opposing pieces 9b, 9c, and the first connecting pieces 8c, 8d, the engaging piece 8b, the conductive portion 11, Most of the current flows to the two connecting pieces 9a and the movable contact 7. Therefore, the facing piece
Since the heat generation of 9b and 9c is suppressed, the heat generation of the spring member 6 is suppressed, and the second heat responsive member 13 is less affected by the temperature rise of the spring member 6.

Even in the case where the value of the current flowing through the contact is large, this can suppress the temperature rise of the spring member 6 by the temperature suppressing member 11, so that the second heat responsive member 13
Since it becomes more accurate to respond to changes in the surrounding temperature, it is possible to improve the accuracy of opening and closing the contacts depending on the illuminance. Further, the facing pieces 9b and 9c of the spring member 6 are the first connecting piece 8
Even if it is two pieces of a substantially flat plate shape that is arranged between c and 8d and has a substantially U-shape, and has a narrow cross-sectional area, the current is bypassed by the conductive portion 12 to make it more reliable. The temperature rise of the spring member 6 can be suppressed.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. In this case, the connection position of the conductive portion 12 as the temperature suppressing member 11 is changed.

The conductive portion 12 is formed of a braided conductive wire as in the first embodiment, and has one end 12a at the point C of the other end 10b of the compression portion 10 of the spring member 6 and the other end 12b of the connecting member. The connection terminal 15a of 15 is attached to the point D by solder or the like, and the other portions are arranged so as not to come into contact with the portion made of a conductive material such as the spring member 6. Therefore, the conductive portion 12
Is a bypass circuit shown by the alternate long and short dash line in FIG.

This is composed of the connecting member 15 which is attached to the spring member 6 from the connecting member 8a, the first connecting members 8c and 8d, the engaging member 8b, and the facing members 9b and 9c.
Most of the current flowing to the second connecting piece 9a and the movable contact 7 is from the point D of the connecting terminal 15a of the connecting member 15 to the C of the other end 10b of the compressing portion 10 of the spring member 6 via the conductive portion 12. Because of flowing to the points, heat generation of the facing pieces 9b, 9c, the engaging piece 8b, the first connecting pieces 8c, 8d, and the attaching piece 8a is suppressed. Therefore, the second heat responsive member 13 is unlikely to be affected by the temperature rise of the spring member 6.

Therefore, since the temperature suppressing member 11 can further suppress the temperature rise of the spring member 6, the second heat responsive member 13 can more accurately respond to the temperature change of its surroundings.

FIG. 9 shows a modification of the second embodiment, which is a conductive portion 12
One end 12a of the second heat responsive member 13 is attached to the locking portion 13c of the second heat responsive member 13. This one also has facing pieces 9b, 9c, engaging pieces 8b,
Heat generation of the first connecting pieces 8c, 8d and the attachment piece 8a is suppressed.

Next, a third embodiment of the present invention will be described with reference to FIGS.
It will be described based on. This is one in which the illuminance at which the contacts open and close can be adjusted. It should be noted that this embodiment does not have a temperature suppressing member.

A current adjusting member 30 adjusts the current flowing through the heating element 4. The current adjusting member 30 is formed of a variable resistance and is arranged in series between the photoelectric element 3 and the first terminal 18, and the adjusting portion 30a thereof has a side surface 22a of the casing 22.
It is installed on the upper surface 2a of the support base 2 so as to face in the direction of and in the vicinity of the side surface 22a. The adjustment unit 30a rotates to change the resistance value of the variable resistor.

The casing 22 has an adjusting hole 22b on its side surface 22a for adjusting the adjusting portion 30a of the current adjusting member 30. FIG. 13 is a perspective view showing a usage state of the photoelectric automatic contact opening / closing device 1.
It is attached to a box main body 31 made of resin or the like so that light can enter.

In this case, a driver or the like is inserted through the adjusting hole 22b of the side surface 22a of the casing 22 so that the current adjusting member 30
By rotating the adjusting unit 30a, the resistance value of the current adjusting member 30 is changed, and as a result, the current flowing through the heating element 4 can be adjusted. Therefore, the illuminance at which the contacts open and close can be adjusted according to the setting location and application of the photoelectric automatic contact opening and closing device 1, thus improving usability.

The mounting position of the conductive portion 12 as the temperature suppressing member 11 is not limited to these embodiments, and the point is that at least a part of the current flowing through the spring member 6 is bypassed. I wish I had it. Further, the temperature suppressing member 11
Was described as the conductive portion 12 made of a braided conductive wire, but is not limited to the braided conductive wire, but a single wire conductive wire, a conductive wire made of a flexible printed board, a fan, a Peltier element, or the like, a spring member by cooling. It may be one that suppresses the temperature rise of 6. Of course, the cross-sectional area of the braided conductor is not limited to that of this embodiment. Further, the current adjusting member 30 has been described as a variable resistor whose resistance value changes by rotating, but the current adjusting member 30 is not limited to this, and a plurality of resistors having different resistance values are selected to be the heating element 4. Anything, such as one to be connected, that can adjust the current flowing through the heating element 4 may be used. In addition, although the temperature suppressing member is not provided in the third embodiment, it goes without saying that the temperature suppressing member may be provided.

[0048]

In the photoelectric automatic contact switching device according to the first aspect of the present invention, since the temperature suppressing member can suppress the temperature rise of the spring member even when the current value flowing through the contact is large, the second thermal responsive member is Since the change in the surrounding temperature becomes more accurate, the contact opening / closing accuracy depending on the illuminance can be improved.

In addition to the effect of claim 1, the photoelectric automatic contact switching device according to claim 2 suppresses heat generation of the spring member by bypassing the current flowing through the spring member through the conductive portion. Since the temperature rise is suppressed, the temperature rise of the spring member can be surely suppressed.

Further, in addition to the effect of claim 2, the photoelectric automatic contact opening and closing device according to claim 3 is such that the facing piece of the spring member is arranged between the first connecting pieces and has a substantially U-shape. Since it is a substantially flat plate-shaped two piece and has a narrow cross-sectional area through which the current passing through the movable contact flows, by bypassing the current by the conductive portion, the temperature rise of the spring member can be suppressed more reliably.

In addition to the effect of claim 3, the photoelectric automatic contact switchgear according to claim 4 has a conductive part so that a current flows from the second connecting piece of the reversing part of the spring member to the main part. Therefore, the conductive portion can be formed integrally with the spring member, which improves productivity.

Further, in addition to the effect of the third aspect, the photoelectric automatic contact opening / closing device according to the fifth aspect allows current to flow from the compression portion of the spring member to a portion other than the spring member and electrically connected to the spring member. Since the conductive portion is formed, heat generation in the portion other than the spring member can be suppressed and the temperature rise can be suppressed, so that the contact opening / closing accuracy depending on the illuminance can be further improved.

In addition to the effect of any one of the first to fifth aspects, the photoelectric automatic contact switching device according to the sixth aspect can set the current flowing through the heating element by the current adjusting member. The illuminance at which the contacts open and close can be adjusted according to the location, improving usability.

Further, in addition to the effect of the sixth aspect, the photoelectric automatic contact switching device according to the seventh aspect can adjust the current flowing through the heating element by the variable resistance, so that the illuminance for opening and closing the contact is adjusted. Since it is easy, the usability is further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a photoelectric automatic contact switching device according to a first embodiment of the present invention.

FIG. 2 is a side view of a member having a spring member and the like of the photoelectric automatic contact opening / closing device.

FIG. 3 is a side view of a member having a spring member and the like of the photoelectric automatic contact opening / closing device as viewed from another direction.

FIG. 4 is a front view of a spring member of the photoelectric automatic contact opening / closing device.

FIG. 5 is a side view of a spring member of the photoelectric automatic contact opening / closing device.

FIG. 6 is a circuit diagram of a photoelectric automatic contact switchgear showing a first embodiment and a second embodiment of the present invention.

FIG. 7 is a sectional view of a photoelectric automatic contact opening / closing device according to a second embodiment of the present invention.

FIG. 8 is a front view of a spring member of the photoelectric automatic contact opening / closing device.

FIG. 9 is a sectional view of a photoelectric automatic contact opening / closing device showing a modification thereof.

FIG. 10 is an exploded perspective view of a photoelectric automatic contact switchgear according to a third embodiment of the present invention.

FIG. 11 is a perspective view of the photoelectric automatic contact opening / closing device.

FIG. 12 is a circuit diagram of the photoelectric automatic contact switchgear.

FIG. 13 is a perspective view showing a usage state of the photoelectric automatic contact opening / closing device.

FIG. 14 is a sectional view of a photoelectric automatic contact opening / closing device showing a conventional example of the present invention.

[Explanation of symbols]

 1 Photoelectric automatic contact opening / closing device 2 Support base 3 Photoelectric element 4 Heating element 5 First thermal response member 6 Spring member 7 Movable contact 8 Main part 8b Engaging piece 9 Reversing part 9a Second connecting piece 9b, 9c Opposite piece 10 Compression Part 11 Temperature suppression member 12 Conductive part 13 Second thermal response member 16 Fixed terminal 17 Fixed contact 22 Casing 30 Current adjusting member

Claims (7)

[Claims] 1. A photoelectric element for detecting illuminance, a heating element whose heat generation state changes in accordance with the detected illuminance of the photoelectric element, and a first thermoresponsive member which is displaced in response to temperature change due to heat from the heating element. A spring member having a movable contact, which is displaced in conjunction with the displacement of the first heat responsive member and operates so that the movable contact opens or closes with respect to the fixed contact when the moving distance exceeds a predetermined value. A photoelectric automatic contact opening / closing device having a second heat responsive member for determining a relative position of the member with respect to the first heat responsive member, and for correcting an error due to temperature of a movement distance of the spring member by the first heat responsive member. A photoelectric automatic contact opening / closing device provided with a temperature suppressing member for suppressing a temperature rise of the spring member. 2. The photoelectric automatic contact opening / closing device according to claim 1, wherein the temperature suppressing member is formed of a conductive portion that bypasses a current flowing through a spring member other than the movable contact. 3. The spring member has a substantially flat plate-shaped attachment piece at one end, a substantially flat plate-shaped engagement piece pushed by the first heat responsive member at the other end, and the attachment piece and the engagement piece connected to each other. And a substantially U-shaped main body having two first connecting pieces that are arranged in parallel in the shape of a substantially flat plate, and a second U-shaped connecting piece and a facing piece that form a substantially U-shaped shape. And a reversing portion which is a flat plate and has a movable contact attached to the second connecting piece, one end of the facing piece is joined to the engaging piece of the main body portion and which is arranged between the first connecting pieces, and the reversing portion. A substantially elongated flat plate-shaped compression portion that is attached to the second connection piece of the spring member and that is locked to the second heat responsive member, and the conductive portion is a facing piece of the reversal portion of the spring member. The photoelectric automatic contact opening / closing device according to claim 2, wherein the photoelectric automatic contact opening / closing device is formed so as to bypass. 4. The photoelectric automatic contact opening / closing device according to claim 3, wherein the conductive portion is formed so as to connect the second connecting piece of the reversing portion of the spring member and the main body portion. 5. The conductive portion is a compression portion of a spring member,
The photoelectric automatic contact opening / closing device according to claim 3, wherein a portion other than the spring member and connected to the spring member is formed to be connected. 6. The photoelectric automatic contact opening / closing device according to claim 1, further comprising a current adjusting member for adjusting a current flowing through the heating element. 7. The photoelectric automatic contact switching device according to claim 6, wherein the current adjusting member is formed of a variable resistor and is arranged in series with a heating element.