JPH11345377A - Led fixing structure of sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a LED fixing structure of sensor, by which LED can be surely fixed without being broken or the like even if there is an error in its size. SOLUTION: LED 2 is provided with an LED main body 21, lead wires 22 and a flange part 23 arranged between them and having a diameter being larger than the LED main body 21 and LED 2 is fixed to the sensor 1 in the LED fixing structure of the sensor. The structure is provided with a main body side fixing part 11 which is abutted on the surface on the side of the LED main body 21 of the flange part 23, a printed substrate 3 being a lead side fixing part positioned at the side of the lead wire 22 of the flange part 23 and a rubber plate 4 being an elastic member which is positioned between the main body side fixing part 11 and the printed substrate 3 and abutted on the surface at the side of the lead wire 22 of the flange part 23. Then, the flange part 23 is held among the part 11, the rubber plate 4 and the printed substrate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an LED fixing structure of a sensor for fixing an LED inside the sensor.

[0002]

2. Description of the Related Art Today, sensors such as photoelectric smoke detectors are widely used as disaster prevention equipment for buildings. In such a sensor, an LED is often used to detect the generation of smoke or to transmit information to the outside by lighting / flashing, and such an LED is fixed to the sensor. In particular, LEDs that directly contribute to detection, such as LEDs that detect the generation of smoke, are required to be securely fixed in a predetermined direction.

FIG. 4 is an enlarged view of the periphery of an LED employing a conventional LED fixing structure of a sensor, wherein FIG.
(B) is a longitudinal sectional view. As shown in FIG. 3, the sensor 1 is provided with a hollow cylindrical fixing portion 100,
When the LED 2 is fitted into this, the LE 2
D2 is fixed to the sensor 1. In such a fixing structure, the inner diameter of the fixing portion 100 is set slightly smaller than the outer diameter of the LED 2 in order to reliably fix the LED 2 in a predetermined direction. The LED 2 is press-fitted into the fixed portion 100 while pushing the peripheral wall 101 of the fixed portion 100 outward (in the direction of the arrow in the drawing) at its side, and the LED 2 is firmly pressed and fixed by the peripheral wall 101 of the fixed portion 100. ing.

[0004]

However, in the conventional LED fixing structure of such a sensor, only the LE is used.
Since D2 is press-fitted into the fixed portion 100, the fixed pressure is directly applied to the side of the LED2. Here LED2
In some cases, a manufacturing error may occur in the outer diameter of the LED 2 and the inner diameter of the fixing portion 100. In this case, the fixing pressure applied to the side of the LED 2 also fluctuates.
Since the side portion 2 is made of plastic having a low elasticity, it cannot sufficiently absorb the fluctuation of the fixed pressure. Therefore, the fixing pressure is low, so that the LED 2 is loosely fixed and its directionality cannot be accurately maintained, or the fixing pressure is high, which may cause a crack 2a on the side portion of the LED 2 or the fixing portion 100.

[0005] The present invention relates to a conventional LE detector for such a sensor.
It is made in view of the problem in the D fixing structure.
It is an object of the present invention to provide an LED fixing structure for a sensor that can securely fix an ED even if it has a dimensional error without causing damage or the like.

[0006]

In order to solve the above-mentioned problems in the conventional LED fixing structure of the sensor, the present invention according to the first aspect of the present invention comprises an LED main body, a lead wire, and a lead wire. A sensor LED for fixing an LED, which is disposed and has a flange portion having a larger diameter than the LED body, to the sensor
In the fixing structure, a main body-side fixing portion that contacts the surface of the flange portion on the LED main body side, a lead-side fixing portion located on the lead wire side of the flange portion, and the main body-side fixing portion and the lead-side fixing. An elastic member positioned between the main body side fixing portion and the lead wire side surface of the flange portion, wherein the flange portion is sandwiched by the main body side fixing portion, the elastic member and the lead side fixing portion. It is characterized by doing.

[0007] The present invention described in claim 2 provides the present invention.
In the present invention, the main body-side fixing portion is provided integrally with the sensor, and the lead-side fixing portion is provided detachably with respect to the sensor.

[0008] The present invention according to claim 3 provides the present invention.
Alternatively, in the present invention described in Item 2, the flange portion and the body-side fixing portion are in surface contact with each other.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the LED of the sensor according to the present invention will be described.
An embodiment of the fixing structure will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view around the LED of the sensor according to the LED fixing structure of the sensor according to the present embodiment, and FIG.
FIG. 3 is an enlarged view of a main part of FIG. In the description, the longitudinal direction refers to the left-right direction in the normal view state of FIG. 1, and the side surface refers to a plane parallel to the vertical direction in the normal view state of FIG. As shown in FIG. 1, the sensor 1 is provided with a main body side fixing portion 11 for inserting and fixing the LED 2, and the main body side fixing portion 11 with the LED 2 interposed therebetween.
The printed circuit board 3 serving as a lead-side fixing portion
And a rubber plate 4 as an elastic member.

As shown in FIGS. 1 and 2, the LED 2 includes an LED body 21 and a pair of lead wires 22, 22 electrically connected to the LED body 21 and capable of supplying power to the LED body 21. And a flange portion 23 disposed between the LED body 21 and the lead wires 22, 22.
It is comprised including. The LED body 21 has a cylindrical side wall, and the tip (the side facing the lead wire 22) is hemispherical. A light emitting element (not shown) is disposed in the LED body 21 (only L
In the case of the ED main body 21, the side wall and the tip end excluding the light emitting element inside the ED main body 21 are shown). The flange portion 23 is formed in a disk shape having a diameter slightly larger than the outer diameter of the side wall of the LED main body 21, and has a side surface protruding outside the side surface of the side wall of the LED main body 21. Note that these L
The ED body 21 and the flange portion 23 are integrally formed of plastic.

A main body side fixing portion 11 for inserting and fixing the LED 2 is formed integrally with the sensor 1.
2, a flange storage section 13 and a rubber plate storage section 14 are provided. The insertion portion 12 is for inserting the LED body 21 and is formed in a hollow cylindrical shape. The insertion portion 12 has a length in the longitudinal direction substantially corresponding to the length in the longitudinal direction of the LED main body 21.
It is formed slightly larger than the outer diameter of the side wall of the main body 21.
Therefore, the LED main body 21 can be easily inserted into the insertion portion 12. An aperture plate 15 is provided at one end of the insertion section 12.

The flange accommodating portion 13 is for accommodating the flange portion 23 of the LED 2.
Is formed at a position and a shape substantially corresponding to. That is, the flange accommodating portion 13 is provided at the end of the insertion portion 12 on the side opposite to the diaphragm plate 15 and forms a disk-shaped space having a diameter slightly larger than that of the flange portion 23. Flange storage part 1
3 (the dimension along the left-right direction in FIG. 1, the same applies hereinafter)
The thickness is set equal to or slightly smaller than the thickness of the flange portion 23. In a state where the flange portion 23 is stored in the space of the flange storage portion 13, as shown in FIG.
The side surface 23a on the side of the D body 21 abuts.

The rubber plate storage section 14 is for storing the rubber plate 4 and is formed at a position and a shape substantially corresponding to the rubber plate 4. That is, the rubber plate storage portion 14 is further provided on the lead wire 22 side than the flange storage portion 13. Further, in the present embodiment, the rubber plate 4 has a disk shape as described later, so that the rubber plate storage portion 14 forms a disk-shaped space having a diameter slightly larger than that of the rubber plate 4. The thickness of the rubber plate storage part 14 is
Is set to be the same or slightly thinner. Then, in a state where the rubber plate 4 is stored in the space portion of the rubber plate storage portion 14, the side surface of the rubber plate 4 on the LED main body 21 side is in contact with the side surface of the rubber plate storage portion 14 as shown in FIG. 1.

On the other hand, the rubber plate 4 is an elastic body having an elastic force.
It is formed in a disk shape having a larger diameter. And FIG.
As shown in the figure, in a state where the rubber plate 4 is stored in the rubber plate storage portion 14, the outer peripheral portion of the side surface of the rubber plate 4 on the LED body 21 side contacts the side surface of the rubber plate storage portion 14. The peripheral portion contacts the side surface of the flange portion 23 on the lead wire 22 side.

The printed circuit board 3 is formed in a plate shape larger than the rubber plate 4. As shown in FIG. 1, the printed circuit board 3 is disposed in parallel with the rubber plate 4, and the outer peripheral portion of the side surface on the rubber plate 4 side is the rubber plate storage portion 14.
Of the rubber plate 4 and the side surface of the rubber plate 4 on the lead wire 22 side. In this state, the printed circuit board 3 is detachably fixed to the sensor 1 by fixing screws 16 penetrating the outer peripheral portion. The printed board 3 and the rubber plate 4 have a pair of lead wires 2
At a position and a diameter corresponding to 2, 22, a pair of insertion holes 3a, 3
a, 4a, 4a are formed, and the respective insertion holes 3a, 3a
a, 4a, and 4a, the lead wire 22 is
Further, it can be pulled out to the outside of the rubber plate 4 (the side away from the main body side fixing portion 11).

In the fixed structure as described above, the LED 2
Is clamped between the main body side fixing portion 11, the printed board 3 and the rubber plate 4, and is fixed to the sensor 1 by the clamping. That is, as shown in FIG. 1, when the printed board 3 is fixed to the sensor 1, the rubber plate 4 is
Side, and the flange portion 23 is
The flange 23 is pressed against the side of the flange body 13 as shown in FIG.
3a, the movement of which is restricted. Therefore, the flange portion 23 is fixed to the flange storage portion 13, and thus the LED 2 is fixed to the sensor 1.

In such a fixing structure, the flange portion 23 is pressed only in the longitudinal direction of the LED 2, while the inner diameter of the insertion portion 12 is formed slightly larger than the outer diameter of the side wall of the LED main body 21. The side wall of 21 is not pressed. Therefore, even if a manufacturing error occurs in the outer diameter of the LED 2 or the inner diameter of the insertion portion 12, unlike the conventional case, L
Cracks and the like do not occur on the side wall of the ED main body 21. On the other hand, the flange portion 23 is
Since the pressing force is applied to the D body 1 side, even if a manufacturing error occurs in the thickness of the flange portion 23, the error is detected by the rubber plate 4.
And the pressing force sufficient to fix the LED 2 can be constantly applied.

Further, as described above, since the side surface 23a of the flange portion 23 on the side of the LED body 21 abuts on the side surface 13a of the flange storage portion 13, as shown in FIG. Are in surface contact with each other, and the direction of the flange portion 23 is kept constant by this contact surface. Therefore, by determining the direction of the side surface 13a of the flange housing portion 13 in advance so that the LED 2 faces in the predetermined direction, the direction of the LED 2 can be easily and accurately maintained in the predetermined direction.

Finally, the procedure for assembling the fixing structure will be described. First, the LED 2 is inserted in the insertion portion 12 of the main body side fixing portion 11.
Of the LED main body 21 and at the same time
Is stored in the flange storage section 13. Then, the rubber plate 4 is arranged on the lead wire 22 side of the LED 2, and the rubber plate 4 is stored in the rubber plate storage portion 14 of the main body side fixing portion 11 while the lead wire 22 is inserted through the insertion hole 4 a. The printed circuit board 3 is arranged on the lead wire 22 side of the LED 2, and the printed circuit board 3 is inserted through the insertion hole 3 a.
Is screwed to the sensor 1 with the fixing screw 16. This completes the assembly. Thus, in assembling the fixed structure,
1 and 2, the LED 2, the rubber plate 4 and the printed circuit board 3 may be arranged in order from the left to the right, and the assembling work can be performed from only one direction, so that the assembling becomes very easy. The lead wire 22 of the LED 2 may be inserted through the rubber plate 4 and the printed circuit board 3 in advance, and these may be integrally fixed to the main body side fixing portion 11.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea. Therefore, these different modes will be described below. First, the main body side fixing part 11, LED2,
With respect to the shapes of the rubber plate 4 and the printed circuit board 3 and the structure for fixing the printed circuit board 3 to the sensor 1, all well-known structures other than the structure shown in the above embodiment are adopted, except for the features described in the claims. May be. For example, rubber plate 4
And the printed circuit board 3 is not limited to a disk shape. Rubber plate 4
May be smaller than the flange portion 23, or the diameter of the printed circuit board 3 may be smaller than the rubber plate 4. However, by sequentially increasing the diameter of the flange portion 23, the diameter of the rubber plate 4, and the diameter of the printed circuit board 3 as in the above embodiment,
A more stable fixing structure can be configured.

Although the lead wire side fixing portion is shown as the printed board 3 in the above embodiment, the printed board 3
In addition to the plate-like member as described above, any shape and structure can be used as long as the rubber plate 4 can be pressed toward the flange portion 23 side. Further, the rubber plate 4 can be replaced with an elastic body other than rubber, and the flange portion 23 is located at least between the main body side fixing portion 11 and the printed circuit board 3 serving as the lead wire side fixing portion. Any material may be used as long as it elastically presses against the main body 21 side. Further, in the above embodiment, the main body side fixing portion 11 is provided integrally with the sensor 1, while the printed circuit board 3 as the lead wire side fixing portion is attached to the sensor 1.
The main body side fixing portion 11 and the printed circuit board 3 may be provided detachably with respect to the sensor 1, or only the printed circuit board 3 may be provided detachably with respect to the sensor 1. Good.

[0022]

As described above, according to the first aspect of the present invention, the main body-side fixing portion abutting on the surface of the flange portion on the LED main body side, and the lead-side fixing portion located on the lead wire side of the flange portion. An elastic member located between the main body side fixing portion and the lead side fixing portion and abutting on the surface of the flange portion on the lead wire side, wherein the main body side fixing portion, the elastic member and the lead side fixing portion By clamping the flange portion, the LED can be fixed to the sensor by pressing the flange portion only in the longitudinal direction of the LED, and the side wall of the LED main body is not pressed. Therefore, even if a manufacturing error occurs in the outer diameter of the LED or the fixing portion on the main body side, unlike the related art, no crack is generated on the side wall of the LED main body. On the other hand, since the elastic member presses the flange portion toward the LED main body, even if a manufacturing error occurs in the thickness of the flange portion, the error can be absorbed by the elastic force of the rubber plate. In addition, a sufficient pressing force for fixing the LED can always be applied.

Further, according to the present invention, the main body-side fixing portion is provided integrally with the sensor, and the lead-side fixing portion is provided detachably with respect to the sensor. By fixing the elastic member to the container, the elastic member can be pressed toward the main body-side fixing portion, and the assembling is easy.

According to the third aspect of the present invention, since the flange portion and the body-side fixing portion are brought into surface contact with each other, the direction of the flange portion is fixed by the contact surface between the flange portion and the body-side fixing portion. Is maintained. Therefore, the direction of the LED can be easily and accurately maintained in the predetermined direction by previously determining the direction of the side surface of the flange housing portion so that the LED is oriented in the predetermined direction.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an LED of a sensor according to an embodiment of the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIGS. 4A and 4B are views showing the periphery of the LED of the sensor according to the conventional LED fixing structure of the sensor, wherein FIG.
Is a longitudinal sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector 2 LED 3 Printed circuit board 3a Insertion hole 4 Rubber plate 4a Insertion hole 11 Main body side fixing part 12 Insertion part 13 Flange storage part 14 Rubber plate storage part 15 Aperture plate 16 Fixing screw 21 LED main body 22 Lead wire 23 Flange

Claims (3)

[Claims] 1. An LED fixing structure of a sensor for fixing an LED having an LED main body, a lead wire, and a flange portion disposed between them and having a larger diameter than the LED main body to the sensor, wherein: A body-side fixing portion that contacts the surface of the LED body, a lead-side fixing portion that is located on the lead wire side of the flange portion, and is located between the body-side fixing portion and the lead-side fixing portion; An elastic member that abuts the surface of the flange portion on the lead wire side, wherein the flange portion is sandwiched between the main body-side fixing portion, the elastic member, and the lead-side fixing portion. LED fixing structure of the container. 2. The sensor according to claim 1, wherein the body-side fixing portion is provided integrally with the sensor, and the lead-side fixing portion is provided detachably with respect to the sensor. LED fixing structure. 3. The LED fixing structure for a sensor according to claim 1, wherein said flange portion and said main body side fixing portion are brought into surface contact with each other.