JP4683481B2 - Lamp socket - Google Patents

Description

  The present invention particularly includes a pin-shaped base (this is not limited to a configuration in which the connection terminal is formed of a linear pin, and includes a configuration arranged along the inverted T-shaped portion as illustrated in FIG. 1 and the like. In general, the present invention relates to a lamp socket suitable for a lamp having a “base pin”).

  FIG. 8 shows a lamp socket suitable for a high output lamp (Patent Document 1), (a) is a sectional view in a lamp supporting state, and (b) is a sectional view showing a connecting structure between upper and lower halves. is there. In this lamp socket, the socket body 1 is composed of upper and lower halves 2 and 3 made of ceramics. The upper half 2 includes a recess 20 that houses the lower sealing portion 10a of the lamp 10, an insertion hole 21 that penetrates the bottom surface of the recess 20, a pair of connection holes 22 that penetrate vertically and the elastic member 6 ( A mounting hole 23 to be locked (via the lower locking portion 6a) and a pair of fitting portions 24 provided at the lower periphery are formed. The lower half 3 is formed directly below each insertion hole 21 to form a recess 30 in which the contact piece 5 and the coil spring 4 are disposed, and a connection hole 32 communicating with the connection hole 22. The contact piece 5 is made of a genuine contact material (this means a material having excellent conductivity other than a leaf spring, the same applies hereinafter), and one end 12a of the lead wire 12 is connected. The coil spring 4 presses the contact piece 5 and maintains the contact state with the base pin 11. The upper and lower halves 2 and 3 are connected in a state in which the screw member 9 is inserted into the connecting hole 22 and the connecting hole 32 and screwed into the screw hole of the mounting plate 7 disposed on the lower surface of the lower half 3. . In the lamp 10, the base pin 11 is pushed into the gap between the vertical groove 30 a of the recess 30 and the contact piece 5 from the recess 20 and the insertion hole 21, and is electrically connected to the corresponding surface of the contact piece 5. The coil spring 4 is supported with a strength corresponding to the urging force of the coil spring 4. In the above lamp support structure, the elastic wire member 6 abuts against the opposite side surface of the lower sealing portion 10a to correct the posture of the lamp 10 vertically. Reference numeral 8a denotes a mica plate 8a interposed between the bottom surface of the lower half body and the mounting plate 7, and reference numeral 8b denotes a mica plate interposed within the thickness of the upper and lower half bodies.

  The lamp 10 is a ceramic metahalide lamp in which the connection terminal is in the form of a single cap pin. In this lamp structure, as described in Non-Patent Document 1, an improved lamp structure has been developed from the viewpoint of miniaturization and ease of use. As shown in FIG. 1, this lamp has a reverse T-shape in which the lower sealing portion 10b of the lamp 10A has a planar shape and the connection terminal (cap pin 11a) projects from the lower sealing portion 10b. It arrange | positions along the part 10c. Further, the following lamp socket is used for the lamp 10A. In this socket structure, the socket main body forms an insertion hole and an arrangement portion into which the cap pin 11a is inserted, and a pair of leaf springs that are electrically connected to the cap pin 11a are arranged on the arrangement portion. That is, the socket main body is made of ceramics, and a leaf spring can be arranged in the inner circumferential direction as the arrangement portion, and a positioning vertical groove and a locking portion are formed. The leaf spring is made of a conductive material (for example, a phosphor bronze material for the spring), which serves as a contact piece and an urging means, and is fitted into the socket main body along the vertical groove and to the locking portion. A protrusion to be engaged and a piece-like contact portion protruding obliquely from the mounting portion are formed. When the lamp 10A is rotated by a predetermined angle in the circumferential direction against the urging force of the leaf spring after the cap pin 11a is inserted into the contact portion of the leaf spring mounted on the socket body from the insertion hole, the normal electric Connected. The above socket structure is referred to as a lamp socket A.

JP 2003-86312 A The Illuminating Society of Japan Publishing, "Journal of the Illuminating Society", published on January 1, 2006, Volume 90, No. 1, pp. 33-36

Each of the conventional structures described above has a problem from the following points and has not been satisfied yet.
(A) In the lamp socket of FIG. 8, since the contact piece is urged by a dedicated coil spring, a genuine contact material can be used as compared with a leaf spring used in the lamp socket A. Excellent electrical characteristics. This is because if the contact piece is made of a leaf spring, it will be bothered by heat treatment and surface treatment, etc., and it will be difficult to save energy by limiting the material selection and improving the electrical characteristics or suppressing the heat generation during lighting, This is because it becomes impossible to maintain stability for a long time.
(B) Since the socket body of FIG. 8 has a two-part configuration of the upper and lower halves, the contact piece and the biasing member can be accurately placed between the upper and lower halves. When the member is tightened against the mounting plate, insufficient tightening may occur, or cracking may occur in the upper half and the lower half due to excessive tightening. Moreover, the part which forms the connection hole for screw members is required.
(C) The socket body of the lamp socket A does not have a connecting operation as compared with that of FIG. However, it is difficult to further reduce the size of the socket body due to the leaf spring configuration that also serves as the contact piece and the urging means. This is because, in the case of a leaf spring configuration, an attachment portion and a piece-like contact portion must be formed on the leaf spring, and the entire size of the contact portion must be lengthened to give an elastic force.

  An object of the present invention is to eliminate the above problems. Specifically, it is easier to reduce the size of the conventional structure described above while having a contact piece and a dedicated urging member. In addition, the lamp is supported with higher accuracy than the conventional structure shown in FIG. The electrical characteristics and safety are improved by using a contact piece formed of a genuine contact material and a dedicated spring member for the lamp socket A.

  In order to achieve the above object, according to the present invention, the socket body is made of ceramic, and an insertion hole for inserting a cap pin of the lamp and an arrangement part for parts are formed. In a lamp socket having a pair of contact pieces electrically connected to the base pin and a biasing means for biasing the contact pieces, the socket body has a stepped portion on the lower surface side and a plurality of lower peripheral portions And a bottom plate made of ceramic capable of supporting the contact piece from below while being fitted to the stepped portion, and both ends locked to the corresponding engaging holes. And a retaining member that is attached in a state and prevents the bottom plate from coming off.

The above socket structure is more preferably embodied as follows.
1stly, the said baseplate is arrange | positioned so that temporary attachment is possible with respect to the said level | step-difference part, and the said retaining member consists of an elastic wire or a piece, and is arrange | positioned along the concave part provided in the said baseplate member, and the said level | step difference part. (Claim 2).
Secondly, the arrangement portion is provided at two locations on the inner periphery to position the both sides of the contact piece in a swingable manner, and a spring positioning portion that receives one end of a coil spring as the biasing means. And the contact piece has a latching portion for locking the other end of the coil spring, and the piece positioning portion is inserted into the socket body from the insertion hole of the lamp base pin. Is held at a normal lamp lighting position by being rotated by a predetermined angle against the urging force of the coil spring disposed between the spring positioning portion and the latching portion with respect to the contact piece disposed on (Claim 3).
Third, the contact piece forms the latching portion on the upper side, and the contact piece is placed on the socket body in a state where the coil spring is disposed between the spring positioning portion and the latching portion. It is the structure which urges | biases to diagonally downward direction (Claim 4).

In the invention of claim 1, safety and contact piece support are provided in the same manner as the conventional structure of FIG. 8 in that the socket body closes the lower surface side with a ceramic member (the bottom plate of the present invention, the lower half of FIG. 8). In addition to being excellent in structure, it can also have the following advantages. In this socket structure, in addition to the advantage described in (a) of paragraph 0005, the bottom plate is disposed on the stepped portion on the lower surface side of the socket body, so that it is easy to miniaturize by suppressing the height dimension. In addition, since the bottom plate is prevented from coming off from the socket body by the retaining member locked in the socket body side engagement hole, there is a risk of cracking due to insufficient tightening or excessive tightening as described in paragraph 0005 (b). Can improve yield.
-In invention of Claim 2, assemblability can be improved with the temporary fix | stop structure of the baseplate with respect to a socket main body. Further, the mounting state of the bottom plate can be stably maintained by using the urging force of the retaining member made of an elastic wire or a piece. Further, since the bottom plate is fitted to the stepped portion and the retaining member is disposed along the concave portion and the stepped portion of the bottom plate, the flatness on the lower surface side of the socket body can be maintained.

In the invention of claim 3, compared to the conventional lamp socket A described above, the contact piece made of genuine contact material and a dedicated coil spring are used as the urging means. It is possible to improve energy consumption by suppressing heat generation during lighting. In addition, in this socket structure, since the contact piece is displaced against the urging force of the coil spring, compared to the conventional product that forms a mounting portion and a piece-like contact portion that is elastically displaced with respect to the leaf spring. The contact state with respect to the pin can be stably maintained, and the amount of overhang in the socket body can be suppressed, which facilitates downsizing while maintaining high quality.
In the invention of claim 4, for example, the coil spring urges the contact piece in an obliquely downward direction, that is, the contact piece is pressed against the base pin by the radial urging component force, and the downward urging amount The play can absorb the vertical play of the contact piece.

  Hereinafter, the best mode of the present invention will be described with reference to the drawings. In this description, the socket structure, the assembly procedure, and the operation will be described in detail in this order. Note that the lamp socket of the invention is applicable as long as it is a cap-pin type lamp. Further, in the ceramic metahalide lamp (hereinafter abbreviated as “lamp”) 10A in FIG. 1, the lower sealing portion 10b has a planar shape, and a base pin 11a that is a connection terminal protrudes from the lower sealing portion 10b. It is the type arrange | positioned along the reverse T-shaped part 10c.

(Socket structure) A lamp socket according to an embodiment includes a socket body 1 forming an insertion hole 13, a mounting hole 14, a component placement portion 15, and the like, and a bottom plate 2 fitted and disposed on the lower inner side of the socket body 1. An outline is formed by a retaining member 3 that is attached to the lower periphery of the socket body 1 by a plug-in method and holds the fitting state of the bottom plate 2 with respect to the socket body 1. Further, the socket body 1 includes a pair of contact pieces 4 arranged with respect to the arrangement part 15 and a coil spring 5 provided between the corresponding part of the arrangement part 15 and the contact piece 4. Yes. The socket body 1 and the bottom plate 2 are made of ceramics having excellent heat resistance and insulation. The retaining member 3 is made of an elastic wire. The contact piece 4 is a metal plate material excellent in conductivity, and is preferably formed of a genuine contact material.

  Here, the socket body 1 has a substantially cylindrical shape. The insertion hole 13 and the mounting hole 14 are provided so as to penetrate vertically. The insertion hole 13 is a substantially rectangular hole corresponding to the substantially T-shaped base pin 11a on the upper surface side, and the lower cavity is enlarged according to the arrangement portion 15, and can be rotated by a predetermined angle with the base pin 11a inserted. It is a simple hole shape. The central portion 13a of the insertion hole 13 has a slightly large hole shape. The mounting hole 14 is formed as a vertical hole that is provided with depressions 14a on both sides of the upper surface of the socket main body with the insertion hole 13 interposed therebetween and penetrates the depressions 14a vertically. This mounting hole 14 is a hole used when fixing to the installation location where the lamp socket of the present invention is used with a stopper or the like. Further, the socket body 1 is formed on the lower surface side with a pair of opening portions 16 provided on the peripheral wall portion corresponding to each placement portion 15 and the placement portion 15 facing the two places. Temporary fixing that forms a gap for engagement between the stepped portion 17 formed, the two or more engaging holes 18 provided in the lower peripheral wall portion extending in the radial direction, and the stepped surface of the stepped portion 17 Part 19.

  As shown in FIGS. 5 and 6, each placement portion 15 is provided in a state of being exposed in the cavity of the insertion hole 13, and rotates the substantially inverted T-shaped cap pin 11 a inserted from the insertion hole 13 clockwise. A stopper surface 6 that divides a cavity for rotating by a predetermined angle (55 degrees in this example) and prevents the rotation of the one-side horizontal portion of the substantially inverted T shape when the cap pin 11a rotates by a predetermined angle. 5 (b)). Further, each arrangement portion 15 includes piece positioning portions 15a and 15b for positioning the both sides of the contact piece 4 so as to be swingable, a spring positioning portion 15c for receiving the coil spring 5, and a protrusion for regulating the coil side surface of the coil spring 5. A portion 15d and an upper restricting portion 15e for restricting the upward movement of the contact piece 4 are formed as a set. In other words, each placement portion 15 is provided on both sides of the insertion hole 13 (the side where each mounting hole 14 is located) and at the most distant location (location displaced approximately 180 degrees) across the central portion 13a. Yes. The piece positioning portions 15a and 15b are formed so that the contact piece 4 can be inserted from the bottom, and prevent the detachment in the radial direction in the inserted state. Specifically, the piece positioning part 15a is formed in a vertical groove, and the piece positioning part 15b is formed by an acute-angled end face of the overhanging part. The spring positioning portion 15c is formed in a concave shape that is positioned closer to the piece positioning portion 15b and becomes narrower as it goes from the bottom to the top, and receives one end of the coil spring 5 in the concave shape. The protruding portion 15d is formed as a small vertical rib on one side of the spring positioning portion 15c, that is, on the side away from the piece positioning portion 15b. The upper restricting portion 15e is provided at the hole lower edge portion of the central portion 13a.

  Each opening 16 has a reverse concave shape and faces each other. In addition to being used for heat dissipation, the opening 16 is used when the lead wire 12 joined to the connection piece 4 with respect to the socket body 1 is pulled out sideways. However, the opening 16 may be omitted. The step portion 17 is a step deeper than the thickness of the bottom plate 2, and is provided in a state in which the lower side of the hole wall portion defining the insertion hole 13 is thinned. Each engagement hole 18 is a small hole that is provided in a lower peripheral portion from the stepped portion 17 and that inserts and locks both end portions 3 a and 3 a of the retaining member 3. The engagement hole 18 is not limited to a through-hole as long as it is a hole in the radial direction of the socket body 1 and may be a concave hole. In short, any hole shape that can lock the end 3a of the retaining member 3 may be used. The temporary fixing portion 19 is provided corresponding to a part of the stepped portion 17, and the bottom plate 2 is disposed on the stepped portion 17 and moved in the peripheral direction, so that the thin portion 23 of the bottom plate 2 is interposed between the stepped portion 17 and the stepped portion 17. Temporarily fix it between.

  On the other hand, as shown in FIG. 7, the bottom plate 2 is in the form of a piece fitted to the stepped portion 17, and has two through holes 20, 20 through which the lead wire 12 passes, and the upper surface side (socket body 1 Are provided on both sides of the concave relief portions 21 and 21 provided on both sides of the inner side of the socket and the intermediate portion on the lower surface side (side provided on the outer side of the socket body 1). An indented portion 22 and a thin-walled portion 23 that are provided at the edge portions on both sides and are fitted to the temporary fixing portion 19 are integrally formed.

  As shown in FIG. 3, the retaining member 3 is formed by bending an elastic wire into a predetermined shape. The intermediate portion 3b is disposed along the stepped portion 17 from the recessed portion 22 of the bottom plate 2, and both end portions 3a. , 3a are inserted into the corresponding engagement holes 18 on the socket body 1 side in the radial direction and elastically locked. Such a retaining member 3 may be formed of an elongated elastic piece.

  The contact piece 4 is formed in a substantially rectangular piece as shown by a one-dot chain line in FIGS. 7 and 5, and both sides 4 a and 4 a are bent slightly outward, and from substantially the middle of the upper side of the contact piece 4. An upper small protrusion 4b that is bent inward and a lower small protrusion 4c that is bent obliquely inwardly from approximately the middle of the lower side are provided. In addition, the upper side of the contact piece 4 is provided with a convex latching portion 4d that is bent outward and obliquely upward. 4 d of latching parts are places which latch the corresponding edge part of the coiled spring by being inserted in the other end side of the coiled spring 5. As shown in FIG. 4, one end 12a of the lead wire 12 is joined to the contact piece 4 by welding or the like on the upper surface side of the lower small protrusion 4c.

(Assembly Procedure) In the socket body 1 described above, first, the two small coil springs 5 are arranged on the spring positioning portion 15c, and then each contact piece 4 has the corresponding piece positioning portions 15a, 15b on both sides 4a, 4a. It is assembled in a state of being fitted to. Then, each contact piece 4 is in a state of falling downward, but the upper small protrusion 4b is locked to the upper restricting portion 15e. The coil spring 5 urges the contact piece 4 obliquely downward with the other end of the coil spring 5 being locked to the latching portion 4d. The coil spring 5 may be incorporated in the socket body 1 together with the contact piece 4.

  Next, the bottom plate 2 is temporarily fixed to the step portion 17 of the socket body 1. In this case, the bottom plate 2 is arranged in the stepped portion 17 and moved in the circumferential direction from the state where the lead wire 12 extending from each contact piece 4 is inserted into each through hole 20, 20, thereby moving each thin portion 23. Is temporarily fixed by being sandwiched in a gap between the stepped portion 17 and the temporary fixing portion 19. Then, as shown by a one-dot chain line in FIG. 7, each contact piece 4 has a part (base end side) of the lower small protrusion 4 c in the direction of the escape portion 21, and the distal end of the lower small protrusion 4 c is the escape portion. The entire surface is kept at a constant height in contact with the inner surface of 21. And as for the bottom plate 2, the retaining member 3 arrange | positions the intermediate part 3b along the level | step-difference part 17 from the hollow part 22, and inserts and locks the edge parts 3a and 3a to the corresponding engagement hole 18 from radial direction, Mounted on the bottom surface of the socket body in a substantially flush state. The retaining member 3 is not carelessly removed because the end 3a is slightly bent with respect to the straight portion and is locked in a state in which the urging force is exerted on the engagement hole 18.

(Operation) The lamp 10A is mounted on the assembled lamp socket. That is, the lamp A is in a state in which the cap pin 11 a is inserted into the insertion hole 13 and the lower sealing portion 10 b is in contact with the upper surface of the socket body 1 for each contact piece 4 built in the socket body 1. While maintaining contact with the contact piece 4, a regular electrical connection state is obtained by rotating the coil spring 5 by a predetermined angle in the circumferential direction against the biasing force of the coil spring 5. This structure can provide the following advantages over the conventional lamp socket A described above.

(A) As for the socket structure, the socket main body 1 has the lower opening closed with the ceramic bottom plate 2, so that the safety is excellent, and the bottom plate 2 is disposed on the lower surface side step portion 17 of the socket main body 1. The height of the socket does not increase, and the height of each part can be easily calculated based on the top or bottom surface of the socket body 1 so that it is easy to check for dimensional variations in manufacturing and quality inspections. Become. Since the bottom plate 2 is prevented from coming off by the retaining member 3 attached to the plurality of engaging holes 18 provided at the lower periphery of the socket main body 1 in a plug-in manner, the bottom plate 2 is insufficiently tightened or excessive as in the connection structure of FIG. There is no risk of cracking due to tight tightening. Further, the mounting state of the bottom plate 2 can be stably maintained by using the urging force of the retaining member 3 made of an elastic wire or a single member.
(B) As the socket structure, the contact piece 4 made of genuine contact material (for example, a material such as brass or copper) and the dedicated coil spring 5 as the biasing means are used. In the same way as above, the electrical characteristics can be improved to suppress heat generation during lighting and energy saving can be achieved. This is also a general metallurgy for terminals and contacts. When a genuine contact material is used in the lighting state as in the present invention, a leaf spring material such as the lamp socket A is used. Compared to, it is about 20 ° C. lower and excellent in energy efficiency. Further, since the contact piece 4 is displaced against the biasing force of the coil spring 5, the contact state with respect to the cap pin 11a can be stably maintained. Further, compared with the lamp socket A, the amount of overhang in the radial direction is suppressed, and the size can be easily reduced.
(C) As the socket structure, since the coil spring 5 urges the contact piece 4 in an obliquely downward direction, the pressure contact state of the contact piece 4 against the base pin 11a is maintained by the radial urging component force. The play in the vertical direction of the contact piece 4 can be absorbed by the downward biasing component force.

  Note that the above embodiments do not limit the present invention. Except for the requirements specified in claim 1, the present invention can be variously modified with reference to this embodiment.

It is a front view which shows the lamp socket of the example of an invention in a lamp support state. It is a schematic perspective view which shows the external appearance of the lamp socket of FIG. (A) And (b) is the top view and bottom view of the said lamp socket. (A) And (b) is a schematic sectional drawing in alignment with the AA line and BB line of FIG. (A) And (b) is the top view and bottom view which show the socket main body single item corresponding to FIG. 3 among the said lamp sockets. It is sectional drawing along CC line of FIG. (A), (b), and (c) are the top view and bottom view which show a baseplate and a contact piece among the said lamp sockets, and a schematic cross section along the DD line of (a). (A) And (b) is explanatory drawing which shows the lamp socket disclosed by patent document 1. FIG.

Explanation of symbols

1. Socket body (13 is an insertion hole, 14 is a mounting hole, 17 is a step, 18 is an engagement hole)
2 ... bottom plate (21 is a relief part, 22 is a hollow part (concave part), 23 is a thin part)
3. Stopping member (3a is an end portion, 3b is an intermediate portion)
4 ... Contact piece (4a is on both sides, 4b is an upper small protrusion, 4c is a lower small protrusion, 4d is a latching part)
5. Coil spring (biasing means)
6: Stopper surface 15 ... Arrangement part (15a, 15b is a single positioning part, 15c is a spring positioning part)
18 ... engaging hole 10, 10A ... lamp 11, 11a ... cap pin 12 ... lead wire (12a is one end)

Claims (4)

The socket body is made of ceramic and has a through hole for inserting a lamp cap pin and an arrangement part for a component, and a pair of contact pieces electrically connected to the lamp pin of the lamp with respect to the arrangement part; In the lamp socket in which the biasing means for biasing the contact piece is disposed,
The socket body has a stepped portion on the lower surface side and a plurality of engaging holes in the lower periphery, and can support the contact piece from the lower side while being fitted to the stepped portion. A lamp socket comprising: a ceramic bottom plate; and a retaining member that is attached to both ends of the ceramic plate in a state of being locked in the corresponding engagement holes and prevents the bottom plate from coming off.   The said baseplate is arrange | positioned so that temporary attachment is possible with respect to the said level | step-difference part, The said securing member consists of an elastic wire or a piece, and is arrange | positioned along the concave part provided in the said baseplate, and the said level | step difference part. Lamp socket as described. The arrangement portion includes a piece positioning portion that positions the both sides of the contact piece in a swingable manner, and a spring positioning portion that receives one end of a coil spring as the urging means, and the contact piece includes the coil spring. Having a latching portion for latching the other end of the
After the cap pin of the lamp is inserted into the socket body from the insertion hole, the coil spring disposed between the spring positioning portion and the latching portion with respect to the contact piece disposed in the piece positioning portion The lamp socket according to claim 1, wherein the lamp socket is held at a normal lamp lighting position by being rotated by a predetermined angle against the urging force. The contact piece forms the latching portion on the upper side, and the coil spring is disposed between the spring positioning portion and the latching portion, and the contact piece is tilted downward in the socket body. The lamp socket according to claim 3, wherein the lamp socket is energized.

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