JP2010129314A - Bulb socket structure of lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize melting damage of a resin part including the inside of a socket hole, and to easily find out an imperfect assembling state. <P>SOLUTION: A resin-made projection 18 is provided in the inside of a socket hole 11. The projection 18 abuts on, when a feed terminal is inserted to the socket hole 11 and set in a regular position, at least one of contact springs 32 and 33 to press and displace the contact spring 32, 33, thereby narrowing the space between the pair of contact springs 32 and 33 to a space capable of holding a base part 102 therebetween, and melts itself when a bulb gets into a state in which the temperature is higher than in normal lighting, thereby releasing the pressing displacement to the contact spring 32, 33 to allow the return of the pair of contact springs 32 and 33 to a free state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bulb socket structure for a lighting device mounted on a ceiling of a vehicle interior.

FIG. 10 shows a configuration of a conventional vehicle interior ceiling lighting device described in Patent Document 1.
This vehicle interior ceiling lighting device includes a lamp unit 200 in which a bulb (incandescent bulb) 100 is mounted on a resin housing 210, a holder 220 to which the lamp unit 200 is attached, and a ceiling trim 230 sandwiched between the lower surface side of the holder 220. It is comprised from the design part 240 attached to.

The bulb 100 of the lamp unit 200 is mounted by inserting a base portion (not shown) of the bulb 100 into a socket hole (not shown) formed in the housing 210, and in this state, the power supply attached inside the socket hole. A terminal (not shown) and a terminal (not shown) on the side of the valve 100 are brought into contact with each other so that the valve 100 can be energized and the valve 100 can be turned on.
JP 2007-203911 A

  By the way, in the conventional lighting device described above, when the bulb 100 abnormally heats up, there is a possibility that the inside of the socket hole or the housing 210 may be largely melted by energization. Further, even when the power supply terminal is assembled to the housing 210 in an incomplete state at the production stage, there is a risk that the defective product may flow out without being noticed because the valve 100 can be energized. .

  The present invention has been made in view of the above-described circumstances, and its purpose is to minimize the melting damage of the resin portion including the inside of the socket hole and to easily achieve an incomplete assembly state. It is an object of the present invention to provide a bulb socket structure of a lighting device that can be found and can prevent outflow of defective products.

In order to achieve the above-described object, the bulb socket structure of the lighting device according to the present invention is characterized by the following (1) and (2).
(1) A socket hole for mounting a valve is provided in a resin housing, and when the base portion of the valve is inserted into the socket hole, the terminal of the base portion is inserted into the socket hole. In the bulb socket structure of the lighting device, the power supply terminal is provided in contact with the power supply terminal, and the power supply terminal includes a pair of contact springs that sandwich the base portion.
When the pair of contact springs of the power supply terminal is in a free state where the base portion is not sandwiched, the contact springs are formed to face each other with a wider interval than the size of the base portion,
In the inside of the socket hole, when the power supply terminal is inserted into the socket hole and installed at a normal position, the contact spring is brought into contact with at least one of the contact springs so as to press and displace the pair of contact springs. When the interval between the contact springs is reduced to an interval at which the base portion can be sandwiched, and when the bulb is in a higher temperature state than when normally lit, the pressure displacement with respect to the contact spring is released by melting itself, Resin protrusions that allow the pair of contact springs to return to the free state are provided,
thing.
(2) In the bulb socket structure of the lighting device configured as described in (1) above,
The pair of contact springs are formed as a pair of cantilever spring pieces that are opposed to each other with the side edges of the bases connected to a common side plate, and the sides facing each other are convex on the free end side of each cantilever spring piece. A curved contact portion is provided,
The protrusion is in contact with a proximal end portion of the curved contact portion;
thing.

According to the valve socket structure having the above configuration (1), when the power supply terminal is inserted to the normal position inside the socket hole, the contact spring abuts on the resin protrusion inside the socket hole. Since the interval between the contact springs facing each other is narrow enough to hold the valve base, the valve base and the contact spring of the power supply terminal can be contacted by inserting the valve base in that state. It can be made conductive. Accordingly, the valve can be normally energized, and the valve can be normally lit.
In addition, the resin protrusion that presses and displaces the contact spring does not melt against the heat generated when the bulb is normally lit, but it melts when the temperature rises to an abnormal temperature higher than when the bulb is normally lit. Then release the pressure on the contact spring. Therefore, when the contact spring returns to the position in the free state by its own reaction force, the gap between the opposing contact springs is widened, the contact conduction between the valve terminal and the power supply terminal is eliminated, and the valve is energized. Is released. Therefore, the melting damage of the resin part can be minimized and the safety can be improved.
In addition, when the power supply terminal is not assembled to the normal position, the contact spring is not pressed and displaced by the resin protrusion, so the distance between the contact springs is not reduced, and the valve base portion is in that state. Even if it is inserted between the contact springs, the terminal of the valve and the power feeding terminal cannot be satisfactorily brought into contact with each other. Therefore, the valve cannot be energized, and the valve is not lit at the time of bulb lighting inspection, so that an incompletely assembled state can be found and the outflow of defective products can be stopped.
According to the valve socket structure having the above configuration (2), since the base portion of the valve is sandwiched between the curved contact portions provided on the free ends of the pair of contact springs, the contact spring and the contact spring have good elasticity. The valve side terminal can be brought into contact conduction. Further, since the resin-made protrusions are arranged at positions where they contact the base end portion of the curved contact portion, the interval between the curved contact portions can be greatly changed even if the protrusion and the contact spring are slightly in contact.

  According to the present invention, even when the valve abnormally generates heat, the resin portion can be prevented from being melted to a minimum. Further, incomplete assembly can be easily found, and the outflow of defective products can be stopped.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of a main part (lamp unit) of a lighting device to which the bulb socket structure of the embodiment is applied, and FIG. 2 is a perspective view showing a configuration of a bus bar having a power supply terminal in a free state used in the main part. 3A is a sectional view showing a state in the middle of assembling the power supply terminal into the socket hole of the housing, FIG. 3B is an enlarged view of the circle IIIb of FIG. 4A, and FIG. FIG. 5 is a cross-sectional view showing a state where the power supply terminal is inserted further into the back, FIG. 5 is a cross-sectional view showing a state where the assembly of the power supply terminal to the normal position of the socket hole is completed, and FIG. FIG. 7 is a perspective view showing a state in which the base portion of the valve is inserted into the socket hole, FIG. 8 is a cross-sectional view showing a normal assembled state, and FIG. A break indicating the condition when heat is generated It is a diagram.

  The vehicle interior ceiling lighting device to which the bulb socket structure of the present embodiment is applied has a lamp unit having a structure as shown in FIG. This lamp unit includes a resin housing 10, an incandescent bulb (hereinafter simply referred to as “bulb”) 100 mounted in the socket hole 11 of the housing 10, and two bus bars 30 (30 </ b> A, 30B) and a switch 14 mounted on the switch mounting portion 13 of the housing 100.

  The socket hole 11 is provided on one end side of the housing 10, and the valve socket structure of the embodiment is applied to the socket hole 11. The socket hole 11 is inclined with respect to the reference surface (the lower surface in FIG. 1) of the housing 10, and the valve 100 is mounted with the axis inclined with respect to the reference surface. . The bulb 100 has a flat base portion 102 below the cylindrical light bulb portion 101, and a terminal (not shown) is provided on the base portion 102.

  As shown in FIG. 2, the bus bar 30 (30 </ b> A, 30 </ b> B) has a power supply terminal 31 on one end side and a pressure contact terminal 38 for connecting an electric wire on the other end side. The pair of power supply terminals 31 formed on each bus bar 30A, 30B is accommodated in the socket hole 11 of the housing 10, so that when the base portion 102 of the valve 100 is inserted, The contact terminal 38 is a portion that is set in the wire connection portion 12 of the housing 10. The power supply terminal 31 and the pressure contact terminal 38 are connected by a connection plate 36, and a side plate 35 of the power supply terminal 31 is provided at one end of the connection plate 36.

  The power supply terminals 31 of the bus bars 30 </ b> A and 30 </ b> B respectively have a pair of contact springs 32 and 33 that sandwich the base portion 102 of the valve 100. The pair of contact springs 32 and 33 are formed by bending a band plate connected to a common side plate 35, and the side edges of the base portions 32 b and 33 b are connected to the side plate 35 so as to face each other. It is formed as a cantilever spring piece. Further, curved contact portions 32a and 33a having convex sides facing each other are provided on the free end side of each cantilever spring piece, and the base portion 102 of the valve 100 can be sandwiched between the convex surfaces of the curved contact portions 32a and 33a. It can be done.

  In this case, as shown in FIG. 2, the pair of contact springs 32 and 33 of the power supply terminal 31 are wider than the thickness dimension of the base portion 102 of the valve 100 when the base portion 102 is not sandwiched. They are formed so as to face each other with an interval H1.

  Further, as shown in FIG. 3, a resin protrusion 18 is provided at a position corresponding to one contact spring 33 on the inner surface of the socket hole 11. In particular, the protrusion 18 is disposed at a position where it contacts the proximal end portion of the curved contact portion 33 a of the contact spring 33.

  As shown in FIG. 3, FIG. 4 and FIG. 5 in order, this protrusion 18 is one when the feeding terminal 31 in the free state is inserted into the socket hole 11 and set in the normal position shown in FIG. The contact springs 33 are forcibly pressed and displaced so that the distance between the pair of contact springs 32 and 33 is narrow enough to hold the base portion 102 as shown in FIG. It fulfills the function of narrowing to H2. On the other hand, when the bulb 100 is in a higher temperature state than when the bulb 100 is normally lit, the protrusion 18 releases its forcible pressure against the contact spring 33 by melting itself, and the pair of contact springs 32, 33. The contact spring 33 is allowed to return to the free state so that the distance between the contact springs 33 is wider than the thickness of the base portion 102. Therefore, the protrusion 18 is made of a resin whose glass transition temperature is set to the temperature at the time of abnormal heat generation.

  When assembling the lamp unit, the two bus bars 30 </ b> A and 30 </ b> B are assembled to the housing 10, the power supply terminal 31 is inserted into the socket hole 11, and the press contact terminal 38 is assembled to the wire connection portion 12. When the power supply terminal 31 is inserted into the socket hole 11 as shown in FIGS. 3 and 4, the vicinity of the proximal end portion of the curved contact portion 33 a of one contact spring 33 hits the resin protrusion 18 inside the socket hole 11, When the power feeding terminal 31 is further inserted, the contact spring 33 is forcibly lifted by the protrusion 18 by reaching the normal position, and the distance between the pair of contact springs 32 and 33 is as shown in FIG. The distance H2 is such that the portion 102 can be sandwiched. At this stage, regular assembly is completed.

  Next, as shown in FIGS. 7 and 8, the base portion 102 of the valve 100 is inserted into the socket hole. Then, the bulb portion 101 of the bulb 100 is supported by the peripheral wall of the socket hole 11, and the base portion 102 is sandwiched between the convex surfaces of the curved contact portions 32 a and 33 a of the pair of contact springs 32 and 33 of each power supply terminal 31, The terminal on the base portion 102 side and the power feeding terminal 31 are brought into contact conduction.

  As described above, when the power supply terminal 31 is inserted to the normal position inside the socket hole 11, the contact spring 33 abuts on the resin protrusion 18 inside the socket hole 11 as shown in FIG. 8. Thus, since the interval between the contact springs 32 and 33 facing each other is narrow enough to hold the base portion 102 of the valve 100, the base portion 102 of the valve 100 is inserted in this state, so that the valve 100 The terminals and the contact springs 32 and 33 of the power supply terminal 31 can be brought into contact with each other. Accordingly, the valve 100 can be normally energized, and the valve 100 can be normally lit.

  In addition, the resin protrusion 18 that presses and displaces the contact spring 33 does not melt with respect to the heat generated when the bulb 100 is normally lit, but when the temperature becomes abnormally higher than when the bulb 100 is normally lit, As shown in FIG. 9, the pressure on the contact spring 33 is released by melting itself. Therefore, when the contact spring 33 returns to the position when the contact spring 33 is in the free state, the space between the contact springs 32 and 33 facing each other is widened, and the contact conduction between the terminal of the valve 100 and the power supply terminal 31 is eliminated. Thus, the power supply to the valve 100 is released. Therefore, the melting damage of the resin housing 10 can be minimized, and safety can be improved.

  Further, when the power supply terminal 31 is not assembled to the normal position, the contact spring 33 is not pressed and displaced by the resin protrusion 18 so that the distance between the contact springs 32 and 33 is not reduced. Even if the base portion 102 of the valve 100 is inserted between the contact springs 32 and 33 in the state, the terminal of the valve 100 and the power supply terminal 31 cannot be satisfactorily brought into contact. Therefore, the valve 100 cannot be energized, and when the bulb 100 is inspected for lighting, the bulb 100 is not lit, so that an incomplete assembly state can be found and the outflow of defective products can be stopped.

  Further, in the present embodiment, the base portion 102 of the valve 100 is sandwiched between the curved contact portions 32a and 33a provided on the free ends of the pair of contact springs 32 and 33, so that the contact point has good elasticity. The springs 32 and 33 and the terminal on the valve 100 side can be brought into contact with each other. In addition, since the resin protrusion 18 is disposed at a position where the curved contact portions 32a and 33a are in contact with the base end portions, even if the protrusion 18 and the contact spring 33 are slightly contacted, the curved contact portions 32a and 33a The interval can be changed greatly.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is a disassembled perspective view of the principal part (lamp unit) of the illuminating device to which the bulb socket structure of the embodiment of the present invention is applied. It is a perspective view which shows the structure of the bus-bar which has the electric power feeding terminal of the free state used for the main part. (A) is sectional drawing which shows the state in the middle of attaching the electric power feeding terminal to the socket hole of a housing, (b) is an enlarged view of the IIIb circle part of (a). It is sectional drawing which shows a state when the electric power feeding terminal is inserted in the back further from FIG.3 (b). It is sectional drawing which shows the state which the assembly | attachment of the electric power feeding terminal to the regular position of a socket hole was completed. It is a perspective view which takes out and shows the state of a bus bar when a power feeding terminal is assembled at a regular position. It is a perspective view which shows the state which inserted the base part of the valve | bulb in the socket hole. It is sectional drawing which shows a regular assembly state. It is sectional drawing which shows a state when a valve | bulb heats abnormally. It is a disassembled perspective view which shows the structure of the conventional vehicle interior ceiling lighting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing 11 Socket hole 18 Protrusion 31 Feeding terminal 32, 33 Contact spring 32a, 33a Curved contact part 32b, 33b Base part 100 Valve 102 Base part

Claims (2)

A socket hole for mounting the valve is provided in the resin housing, and contact conduction is established with the terminal of the base portion when the base portion of the valve is inserted into the socket hole. In the bulb socket structure of the lighting device, the power supply terminal is provided, and the power supply terminal has a pair of contact springs that sandwich the base portion.
When the pair of contact springs of the power supply terminal is in a free state where the base portion is not sandwiched, the contact springs are formed to face each other with a wider interval than the size of the base portion,
In the inside of the socket hole, when the power supply terminal is inserted into the socket hole and installed at a normal position, the contact spring is brought into contact with at least one of the contact springs so as to press and displace the pair of contact springs. When the interval between the contact springs is reduced to an interval at which the base portion can be sandwiched, and when the bulb is in a higher temperature state than when normally lit, the pressure displacement with respect to the contact spring is released by melting itself, Resin protrusions that allow the pair of contact springs to return to the free state are provided,
A bulb socket structure for a lighting device. The pair of contact springs are formed as a pair of cantilever spring pieces arranged opposite to each other with the side edges of each base connected to a common side plate, and the sides facing each other are convex on the free end side of each cantilever spring piece. A curved contact portion is provided,
The protrusion is in contact with a proximal end portion of the curved contact portion;
The bulb socket structure of the lighting device according to claim 1.

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