JP2012186075A - Light emitting diode unit waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure capable of securing waterproofness by preventing a packing from being turned up during fitting.SOLUTION: A waterproof structure of a light emitting diode unit 10 comprises: a light emitting diode chip 32; a housing 20, in which the light emitting diode chip 32 is built, and which has a mounting opening 20T; a holder 40 mounted to the opening 20T; and a packing 50 mounted on an outer periphery of the holder 40 and sealing between an inner wall of the housing 20 and an outer periphery of the holder 40. The housing 20 has an inclined part 20E, at which an inside diameter of the opening gets gradually larger as it approaches to an outlet of the opening 20T. The packing 50 is inclined so that it gets thicker from the tip to a rear end in a fitting direction, and plural ring-like ribs are formed on an outer periphery of the packing 50. A ridge line across respective top parts of the plural ribs is approximately identical to the inclination of an internal inclined face of the inclined part 20E of the housing 20.

Description

  The present invention relates to a waterproof structure between a housing incorporating a light emitting diode and a holder fitted in the housing, and more particularly to a waterproof structure of a light emitting diode unit in which a packing is interposed therebetween.

  In a waterproof structure consisting of a housing that requires waterproofing and a holder that fits into the opening of the housing, the housing is automatically fitted by fitting the packing to the outer periphery of the holder and fitting the holder into the housing. The thing of the waterproof structure which sealed between the inner wall of this and the holder outer periphery is well-known (for example, refer patent document 1).

<Waterproof structure described in Patent Document 1>
The waterproof structure described in Patent Document 1 is specifically an example of a connector, and has a waterproof structure in which the opening at the rear end of the female terminal fitting housed inside the housing body is sealed with a seal unit. 6 is a longitudinal sectional view showing only the waterproof structure portion described in Patent Document 1 with the female terminal fitting omitted, and FIG. 6 (A) shows the state before fitting the housing body and the seal unit. B) is an enlarged cross-sectional view of the packing portion when the housing body and the seal unit are fitted, (1) is the moment of contact and (2) is immediately after that.
In FIG. 6, the connector 100 includes a housing main body 200 in which a female terminal fitting (not shown) is housed, and a seal unit 400 that is fitted in the rear opening of the housing main body 200 and closes the rear opening of the housing main body 200. It is composed of
Although not shown, the housing body 200 has a plurality of cavities penetrating along the fitting direction of the female terminal fitting, and the bottom of the front end portion in each cavity is locked to the terminal fitting to hold the terminal fitting. A lance is formed to hold the stopper. A female terminal fitting is inserted into each cavity. The housing body 200 is formed in a substantially rectangular parallelepiped shape, and an assembly recess 200T for incorporating the seal unit 400 is formed in the rear part thereof.
The seal unit 400 is a synthetic resin housing, and a seal ring 500 having a packing function made of a rubber material is provided on the outer peripheral edge of the seal unit 400. The size of the seal unit 400 is formed so as to fit into the assembly recess 200T of the housing body 200 and can be fitted.
In the seal ring 500, ribs are formed on the outer periphery along the entire circumference, and three protrusions are formed in the front-rear direction.
Therefore, in a state where the seal unit 400 is assembled in the assembly recess 200T, each seal ring 500 is in close contact with the inner wall surface of the assembly recess 200T and the watertightness between the housing body 200 and the seal unit 400 is maintained. Become so.

JP 2009-110585 A

<Problem of waterproof structure described in Patent Document 1>
According to the waterproof structure described in Patent Document 1, the connector is composed of a housing main body and a seal housing, and the rear side of the cavity is formed separately from the housing main body, as compared with the conventional waterproof structure. Therefore, it is not necessary to secure the size of each cylindrical path of the seal housing in consideration of the extraction of the mold with respect to the lance of the cavity. For this reason, there is an effect that the inner diameter of the cylindrical path can be reduced as compared with the conventional case, and as a result, the entire connector can be reduced in size.
However, as shown in FIGS. 6B and 1, the assembly recess 200 </ b> T of the housing main body 200 first comes into contact with the rib crest of the seal ring 500 and pushes forward. As shown in FIG. 2), there is a possibility that the seal ring 500 may be rolled up. When the seal ring 500 is rolled up, it becomes difficult to ensure waterproofness.
In order to prevent the seal ring 500 from rolling up even when the assembly recess 200T abuts against the rib crest of the seal ring 500, a device for increasing the coupling force between the seal unit 400 and the seal ring 500; For example, the use of a strong adhesive or integral molding is required, which requires an increase in manufacturing processes, securing skilled workers, and an increase in manufacturing time, resulting in an increase in cost.

  The present invention has been made in order to solve the above-described problems, and prevents the packing from being rolled up without using an adhesive or integral molding, and therefore has a waterproof structure in which sufficient waterproofness is ensured. The purpose is to provide.

  In order to achieve the above object, the first invention of the present application relates to a light-emitting diode unit waterproof structure, and includes a light-emitting diode chip having a lead wire, a light-transmitting diode chip built-in, and a transparent opening having a mounting opening. An optical housing; a holder that is attached to the opening of the housing and includes a lead-out portion that passes the lead wire of the light-emitting diode chip; and an inner wall of the housing that is attached to an outer periphery of the holder A waterproof structure for a light-emitting diode unit comprising a seal that seals between the outer periphery of the holder, and the housing has an internal inclined surface that gradually increases in inner diameter of the opening as it approaches the opening. The packing has an inclined shape that gradually increases in thickness from the front end to the rear end in the fitting direction, and is repositioned on the outer periphery. Grayed-shaped ribs are formed in plural, the ridgeline of each top of the plurality of ribs are characterized by substantially equal to the inclination of the inner inclined surface of the housing.

  The second invention of the present application is the light-emitting diode unit waterproof structure according to the first invention, wherein the plurality of ribs sequentially come into contact with the inner inclined surface of the housing from the rib at the rear end in the fitting direction, and the holder The ribs have the same compressibility when fitted to the housing.

  Further, the third invention of the present application is characterized in that in the light emitting diode unit waterproof structure of the second invention, a gap is provided between a rear end portion of the packing and a surface of the holder facing the rear end portion of the packing. It is said.

<Effect of the first invention>
According to the first invention of this application, since the slope of the ridge line connecting the tops of the plurality of ribs is substantially equal to the slope of the internal slope of the slope of the housing, each top of the plurality of ribs is formed on the internal slope of the slope of the housing. Are hit almost simultaneously, so that the tip of the packing does not squeeze up.
<Effect of the second invention>
According to the second aspect of the present invention, since the ribs at the rear end in the fitting direction sequentially contact the inner inclined surface of the housing among the plurality of ribs, the tip end of the packing is further prevented from rising.
Moreover, since the compression rate of each rib is the same in a state in which the holder is fitted with the housing, local exhaustion of the packing does not occur.
<Effect of the third invention>
According to the third invention of the present application, since a gap is provided between the rear end portion of the packing and the surface facing the rear end portion of the packing of the holder, this gap becomes a relief portion of the packing, An increase in conventional insertion force can be prevented, and fitting becomes easy.

FIG. 1 is a diagram for explaining a light emitting diode unit to which a waterproof structure according to the present invention is applied. FIG. 1 (A) is a perspective view of the light emitting diode unit, and FIG. 1 (B) is a front view of the light emitting diode unit. FIG. 2 is a cross-sectional view of the light-emitting diode unit of FIG. FIG. 3 is a longitudinal sectional view of the housing. FIG. 4 is a longitudinal sectional view of a holder with packing. FIG. 5 is a cross-sectional view just before the holder fits into the housing of the light emitting diode unit of FIG. 6 is a longitudinal sectional view schematically showing a waterproof structure portion described in Patent Document 1. FIG. 6 (A) is before the housing body and the seal unit are fitted, and FIG. 6 (B) is the housing body and the seal unit. (1) is the moment of contact and (2) is immediately after that.

  Hereinafter, a light-emitting diode unit waterproof structure according to the present invention, which can prevent the packing from being rolled up without using an adhesive or integral molding, will be described with reference to FIGS.

<Embodiment 1>
FIG. 1 is a diagram for explaining a light emitting diode unit to which a waterproof structure according to the present invention is applied. FIG. 1 (A) is a perspective view of the light emitting diode unit, and FIG. 1 (B) is a front view of the light emitting diode unit. FIG. 2 is a cross-sectional view of the light-emitting diode unit of FIG. FIG. 3 is a longitudinal sectional view of the housing.
1 and 2, the light emitting diode unit 10 includes a housing 20, a board assembly 30, a holder 40, and a packing 50 that is assembled to the holder 40.
Hereinafter, the housing 20, the substrate assembly 30, the holder 40, and the packing 50 will be described.

<Housing 20>
The housing 20 is made of a transparent material, and includes a rectangular parallelepiped portion 20C having an accommodation space 20H, an opening 20T into which a holder 40 (FIG. 2) having a larger volume than the rectangular parallelepiped portion 20C is fitted, and the rectangular parallelepiped portion 20C and the opening. It is comprised with the inclination part 20E which connects 20T.

<< Cuboid 20C >>
Substrate support members 30R and 30R are attached to the left and right side walls forming the accommodation space 20H of the rectangular parallelepiped portion 20C. Each of the substrate support members 30R is a long body having a U-shaped cross section, and the substrate 31 of the substrate assembly 30 is slidably accommodated between the U-shaped grooves of the opposing substrate support members 30R, 30R. The substrate assembly 30 is accommodated in the accommodating space 20H, and light emitted from the light emitting diodes of the substrate assembly 30 is transmitted through the transparent material housing 20 and diffused to the outside.
The boundary between the rectangular parallelepiped portion 20C and the inclined portion 20E is a fitting surface, and the inner diameter thereof is DH (FIG. 3).

<< Opening 20T >>
A locking hole 20K that engages with the locking protrusion 40K (FIG. 4) of the holder 40 is formed in the opening 20T. Therefore, when the holder 40 is inserted into the opening 20T of the housing 20, the tapered portion of the locking projection 40K of the holder 40 comes into contact with the edge of the opening 20T, and the opening 20T is pressed outward. Become. When pressed outward, the housing 20 is warped in the direction in which the opening 20T expands the opening due to the elasticity of the resin material, so that the locking projection 40K of the holder 40 is moved from the edge of the opening 20T to the inside. You can proceed to. When the housing 20 and the holder 40 are finally fitted, the locking protrusion 40K of the holder 40 is also engaged with the locking hole 20K of the opening 20T, and thereafter, the function of preventing the housing 20 and the holder 40 from coming off is provided. Play. The inner diameter of the opening 20T is DS (FIG. 3).

<< Inclined part 20E >>
The seal surface inside the inclined portion 20E of the holder 40 has an inclination angle of an angle θ with respect to the fitting direction with the holder 40. The inner diameter of the fitting surface formed at the boundary between the rectangular parallelepiped portion 20C and the inclined portion 20E is DH (FIG. 3), the inner diameter of the opening 20T is (DS) DS, and the length of the inclined portion 20E in the fitting direction is LS,
tan θ1 = (DS−DH) / (2 × LS) (1)
It becomes.
This angle θ1 is larger than the angle of the die cutting taper that is a molding requirement.

<Substrate assembly 30>
1 and 2, the substrate assembly 30 includes a substrate 31, a light emitting diode chip 32, and lead wires W. The substrate 31 includes a printed circuit, and the light emitting diode chip 32 is electrically connected and mechanically fixed on the printed circuit. A terminal WT is provided in the printed circuit at the end of the substrate 31, and the tip of the lead wire W is connected to the terminal WT. The lead wire W is led out of the holder 40 from the terminal WT through a lead-out portion 40H (FIG. 2) penetrating the holder 40 in the axial direction. A rubber plug 40G functions as a seal between the lead wire W and the lead-out portion 40H.

<Holder 40>
FIG. 4 is a longitudinal sectional view of a holder with packing. 4, the holder 40 includes a fitting portion 40J, a packing mounting portion 40P, and an opening engaging portion 40T from the left side (fitting direction front end side) to the right (fitting direction rear end side) as viewed in FIG. Parts made of synthetic resin.

<< Fitting part 40J >>
The fitting portion 40J is a portion that is fitted into the internal space of the rectangular parallelepiped portion 20C (FIG. 2) of the housing 20, and has an outer diameter larger than that of the packing mounting portion 40P. Thus, at this portion, it is fitted into the internal space of the rectangular parallelepiped portion 20C (FIG. 2) of the housing 20 at the time of fitting, and the packing 50 is prevented from being pulled forward in the fitting direction when the fitting is released. Further, a lead-out portion 40H penetrating in the axial direction is formed.

<< Packing mounting part 40P >>
The packing attachment portion 40P is a cylindrical body following the fitting portion 40J, and a lead-out portion 40H penetrating in the axial direction is formed following the fitting portion 40J. A packing 50 is fitted on the outer periphery of the cylindrical body, and the gap between the inner wall of the housing 20 and the outer periphery of the holder 40 is sealed by the packing 50.

<< Opening engagement portion 40T >>
The opening engaging portion 40T is a portion fitted to the opening 20T (FIG. 2) of the housing 20, and is larger than the outer diameter of the packing mounting portion 40P following the packing mounting portion 40P. In addition, a lead-out portion 40H continuing from the packing mounting portion 40P is formed in the axial direction. The lead wire W from the light emitting diode chip 32 that has passed through the lead-out portion 40H is led out of the holder 40 from the lead-out portion 40H. A locking projection 40K is formed on the outer periphery of the opening engaging portion 40T, and when the housing 20 and the holder 40 are fitted, the locking projection 40K engages with the locking hole 20K of the opening 20T. 20 and the holder 40 cannot be easily removed.

<Packing 50>
The packing 50 is attached to the packing mounting portion 40P of the holder 40. The shape of the packing 50 is a truncated cone shape that gradually becomes thicker from the front end to the rear end in the fitting direction, and a ring is formed on the outer periphery of the conical side surface. A plurality of (in the figure, three) ribs having a cross-sectional shape are formed, and a ridge line connecting the mountain-shaped vertices with respect to the fitting direction and an angle θ are provided. That is, among the three cross-section angle ribs, the horizontal distance between the apex of the rib with the smallest outer diameter and the apex of the rib with the largest outer diameter is Lab, and the height (wall thickness) of the apex of the rib with the smallest outer diameter is a. And the height (wall thickness) of the apex of the rib with the maximum outer diameter is b,
tan θ2 = (ba) / Lab (2)
It becomes.

Example 1: First Invention
The first embodiment of the present invention is characterized in that θ1 in equation (1) and θ2 in equation (2) are θ1≈θ2.
Therefore,
(DS-DH) / (2 × LS) ≈ (ba) / Lab
And it is sufficient.
By doing in this way, since the inclination of the ridge line connecting the vertices of the plurality of ribs and the inclination of the internal inclined surface of the inclined portion 20E of the housing 20 are substantially equal, in FIG. Even if the distance is a little T, each of the tops of the plurality of ribs does not contact the inner inclined surface of the inclined portion 20E, and the tops of the plurality of ribs are almost simultaneously inclined when the fitting shown in FIG. Thus, the tip of the packing 50 does not squeeze up.
In order to prevent the tip of the packing 50 from rolling up and to make the compression rates of the plurality of ribs the same, the thickness of the plurality of ribs is made the same, and instead the inclination of the packing mounting portion 40P is set to θ. Also good.

<< Example 2: Second invention >>
The second embodiment of the present invention is characterized in that θ1 <θ2 in the expression (1) and θ2 in the expression (2) are set to a slight degree. Therefore,
(DS-DH) / (2 × LS) <(ba) / Lab
And it is sufficient.
By doing so, the inclination θ2 of the ridge line connecting the vertices of the plurality of ribs is slightly larger than the inclination θ1 of the internal inclined surface of the inclined portion 20E of the housing 20, so that the internal inclination of the inclined portion 20E of the housing 20 is increased. Since the surface comes into contact with the rib at the rear end in the fitting direction among the plurality of ribs, the tip end of the packing is further prevented from rising.

<< Example 3: Third invention >>
According to the second embodiment, the rear end rib starts to be compressed to the inner inclined surface of the inclined portion 20E of the housing 20 earlier than the front end rib, so the rear end rib is compressed more than the front end rib. Deformed. However, in Example 4 showing the packing at the time of non-compression and Example 2 showing the packing at the time of compression, the thickness of the rib at the tip of the packing 50 in FIG. ) Is the thickness of the rib at the tip of the packing 50, and b is the thickness of the rib at the rear end of the packing 50 in FIG. 4 (when not compressed), and the rear end of the packing 50 in FIG. When the thickness of the rib is b ′, a ′, a, b ′, b are determined so that a ′ / a = b ′ / b, so that the compression rate can be made the same. No local exhaustion occurs and the life of the packing is extended. To do so, let Lab be the horizontal distance between the apex of the rib with the smallest outer diameter and the apex of the rib with the largest outer diameter, and let a 'be the height (wall thickness) of the apex when the rib with the smallest outer diameter is compressed. When b ′ is the height (wall thickness) of the apex when the outer diameter rib is compressed,
tan θ3 = (b′−a ′) / Lab (3)
The housing 20 having an internal inclined surface having an inclination of θ3 may be used.

Example 4: Fourth Invention
In FIG. 4, the gap G is provided between the rear end portion 50E of the packing 50 and the surface 50F facing the rear end portion 50E of the packing 50 of the holder 40.
On the other hand, in the case of the seal ring 500 of FIG. 6, there is no gap between the rear end portion 500E of the seal ring 500 and the end surface 400F of the seal unit 400, and the rear end portion 500E of the seal ring 500 and the end surface 400F of the seal unit 400 Are in contact with each other. Therefore, when the seal unit 400 is assembled into the assembly recess 200T in the direction of the arrow F1, the seal ring 500 gradually moves toward the direction of the arrow F2 and is prevented from progressing to the end surface 400F of the seal ring, so that the thickness gradually increases. Thickness swelled, and it became a reaction force, and the insertion force at the time of fitting became large.
According to the fourth embodiment, even when the packing 50 is further wrinkled toward the back during fitting, the gap G becomes a wrinkling escape portion of the packing 50, so that the insertion force does not increase and the fitting becomes easy.

<Summary>
1) By setting θ1≈θ2, the tops of the plurality of ribs come into contact with the inner inclined surface of the opening of the housing almost simultaneously, and the tip of the packing does not swell.
2) Further, by satisfying θ1 <θ2, the ribs at the rear end of the plurality of ribs come into contact with the inner inclined surface of the housing in order, and the tip end of the packing is further prevented from rising.
3) By making the packing into a truncated cone shape, the thickness of the packing at the front and rear ends in the fitting direction changes, so that the compression rate of each rib is the same when the holder is fitted with the housing. The wall thickness can be selected, so that local exhaustion of the packing does not occur, and thus a long-life light emitting diode unit can be obtained.
4) By providing a space between the back end of the packing and the surface of the holder facing the back end of the packing, this space becomes a clearance for the packing, and the insertion force during fitting can be reduced. Becomes easy.

DESCRIPTION OF SYMBOLS 10 Light emitting diode unit 20 Housing 20C Rectangular body part 20E Inclined part 20H Accommodating space 20K Locking hole 20T Opening part 30 Substrate assembly 30R Substrate support member 31 Substrate 32 Light emitting diode chip 40 Holder 40G Rubber plug 40H Deriving part 40J Fitting part 40K Locking Protrusion 40P Packing mounting portion 40T Opening engagement portion 50 Packing 50E Rear end portion 50F Opposing surface WT Terminal W Lead wire G Gap

Claims (3)

A light emitting diode chip with leads; and
A light-transmitting housing containing the light-emitting diode chip and having an opening for mounting;
A holder that is attached to the opening of the housing and includes a lead-out portion through which the lead wire of the light-emitting diode chip passes;
A packing that is attached to the outer periphery of the holder and seals between the inner wall of the housing and the outer periphery of the holder;
Light-emitting diode unit waterproof structure composed of
The housing has an internal inclined surface such that the inner diameter of the opening gradually increases as approaching the opening,
The packing has an inclined shape that gradually increases in thickness from the front end to the rear end in the fitting direction, and a plurality of ring-shaped ribs are formed on the outer periphery. The waterproof structure for a light emitting diode unit, wherein a connecting ridge line is substantially equal to an inclination of the inner inclined surface of the housing.   Of the plurality of ribs, the ribs are in contact with the inner inclined surface of the housing sequentially from the rear end rib in the fitting direction, and the compression rate of each rib is the same in a state where the holder is fitted with the housing. The light-emitting diode unit waterproof structure according to claim 1.   The waterproof structure for a light emitting diode unit according to claim 2, wherein a gap is provided between a rear end portion of the packing and a surface of the holder facing the rear end portion of the packing.

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