JP2008004450A - Socket for hid lamp, and illumination fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent discharge or lighting of an incompatible lamp even when the incompatible lamp is erroneously inserted which has the same shell outer diameter as that of a compatible HID lamp and which has a smaller distance from one end face of the shell to a metal terminal than the distance of the compatible HID lamp. <P>SOLUTION: An insulation spacer 6 is housed between a center contact piece 41 and a lamp holder 40 of the outer shell 7 into which the compatible HID lamp is inserted that is equipped with the base having the shell, an insulation part, and a metal terminal. The inner diameter of the insulation spacer 6 is larger than the maximum outer diameter of the insulation part, and smaller than the outer diameter of one end face of the shell. The height is equal to or more than the distance in which the space distance specified in the JIS C 8280 is added to the distance from the lower face of the shell to the metal terminal in the incompatible lamp in which the outer diameter of the shell is the same with that of the compatible HID lamp, and the distance from the lower face of the shell to the metal terminal is smaller than that of the compatible HID lamp, and equal to or less than the distance from the lower face of the shell to the metal terminal in the compatible HID lamp. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a socket for a HID lamp and a lighting fixture to which a predetermined compatible HID lamp is mounted.

  Conventionally, many types of lamps such as HID lamps, incandescent lamps, and halogen lamps are commercially available or developed. At the same time, many types of lamp sockets are commercially available or developed as disclosed in Patent Document 1, for example.

Here, although the starting voltage and the operating voltage are different from the incandescent lamp and the halogen lamp, the HID lamp may have a base having the same nominal diameter as the incandescent lamp and the halogen lamp. On the other hand, many sockets for HID lamps have a rated pulse voltage of 5 kV in order to correspond to the starting pulse voltage of a predetermined compatible HID lamp. As a measure to prevent misuse, such as inserting a non-conforming lamp into the socket for HID lamps, it is possible to create a warning between the metal terminal of the non-conforming lamp and the center contact piece of the socket for HID lamps by changing the length of the cap. It is known to prevent contact conduction.
Utility Model Registration No. 2604428 (paragraphs 0012 to 0031 and FIG. 1)

  However, as shown in FIG. 7, the conventional HID lamp socket 9 has the same nominal diameter as that of the compatible HID lamp 1 (see FIG. 4B) and is insulated from the lower surface 801 of the shell 800 of the base 80. If the non-conforming lamp 8 whose length to the metal terminal 804 provided at the tip 803 of the 802 is shorter than the conforming HID lamp 1 and does not have the base reference surface is erroneously inserted, the non-conforming lamp 8 is inserted to any extent, and the non-conforming lamp 8 There is a problem that the metal terminal 804 and the center contact piece 90 are brought into contact with each other. For this reason, there exists a possibility that the nonconforming lamp 8 may discharge or light.

  The present invention has been made in view of the above points. The object of the present invention is that the outer diameter of the shell is the same as that of the compatible HID lamp, and the distance from one end surface of the shell to the metal terminal is larger than that of the compatible HID lamp. An object of the present invention is to provide a socket for HID lamp and a lighting fixture capable of preventing discharge and lighting of a non-conforming lamp even if a short non-conforming lamp is inserted by mistake.

  The invention of the socket for an HID lamp according to claim 1 is provided with a metal shell in which a screwing groove is formed, an insulating portion protruding from one end surface of the shell, and a tip of the insulating portion. A socket for a HID lamp to which a predetermined compatible HID lamp having a base having a predetermined shape having a predetermined metal terminal is mounted, and has a recess that opens in one surface and into which the compatible HID lamp is inserted. An insulating outer shell formed, a metal receiving and screwed into the shell when the compatible HID lamp is stored in the recess, and a compatible HID lamp stored in the recess. A central contact piece that is in contact with and conductive with the metal terminal when formed, and has a cylindrical shape with an inner diameter that is larger than the maximum outer diameter of the insulating portion and smaller than the outer diameter of one end surface of the shell, Applicable outer diameter It is the same as the ID lamp, and the distance from one end surface of the shell to the metal terminal is shorter than the distance from the one end surface of the shell to the metal terminal in the non-conforming lamp, which is shorter than the compatible HID lamp. And an insulating spacer that is accommodated in the recess between the metal receiving member and the center contact piece so as to be in contact with the center contact piece.

  The invention of a socket for an HID lamp according to claim 2 is the invention according to claim 1, wherein the height of the insulating spacer is JIS C 8280 at a distance from one end face of the shell to the metal terminal in the nonconforming lamp. It is characterized in that it is equal to or greater than a distance obtained by adding a spatial distance defined in (1) to a distance from one end face of the shell to the metal terminal in the compatible HID lamp.

  The invention of a socket for an HID lamp according to a third aspect is the invention according to the first or second aspect, wherein the insulating spacer includes a rib protruding at least from the inner wall on the other end side in the center direction, and the outer wall includes the rib. The inner diameter of the insulating spacer is set to be twice the distance from the center to the tip of the rib in contact with the inner surface of the recess.

  The invention of the lighting fixture according to claim 4 includes the socket for the HID lamp according to any one of claims 1 to 3 and a lighting device that controls lighting of the compatible HID lamp mounted in the socket for the HID lamp. It is characterized by that.

  According to the first aspect of the present invention, even if a non-conforming lamp having the same outer diameter as the conforming HID lamp and a distance from one end surface of the shell to the metal terminal being shorter than the conforming HID lamp is erroneously inserted, the non-conforming lamp Since one end surface of the shell can be brought into contact with the insulating spacer, discharge and lighting of the incompatible lamp can be prevented.

  According to the second aspect of the present invention, even if the non-conforming lamp is erroneously inserted, it is possible to ensure a spatial distance defined by the JIS standard.

  According to the invention of claim 3, the outer dimension of the insulating spacer can be freely determined in accordance with the dimension of the recess of the outer shell, the application, and the like.

  According to the invention of claim 4, even if a non-conforming lamp having the same outer diameter as the conforming HID lamp and a distance from one end surface of the shell to the metal terminal being shorter than the conforming HID lamp is erroneously inserted, the non-conforming lamp Since one end surface of the shell can be brought into contact with the insulating spacer, discharge and lighting of the incompatible lamp can be prevented.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. 1 and 5 are diagrams illustrating a socket for an HID lamp according to the first embodiment. FIG. 2 is a diagram illustrating the lighting apparatus of the first embodiment. FIG. 3 is a circuit diagram of the lighting device of the first embodiment. FIG. 4 is a diagram illustrating a mounting state of the lamp in the HID lamp socket according to the first embodiment.

  First, the structure of the lighting fixture of Embodiment 1 is demonstrated. The lighting fixture of Embodiment 1 is a downlight installed on the ceiling surface 5, for example, as shown in FIG. 2 (a), for a compatible HID lamp 1, a fixture body 2, a lighting device 3, and a HID lamp. Socket 4 is provided.

  The adapted HID lamp 1 is a predetermined lamp adapted to the socket 4 for HID lamps, and is provided at the lighting unit 10 that is turned on when power is supplied and at one end of the lighting unit 10 (upper end in FIG. 2A). And a base 11. As shown in FIG. 4B, the base 11 includes a cylindrical metal shell 110 in which a screwing groove (not shown) is spirally formed on the outer surface, and a bottom surface 111 of the shell 110 to the shell 110. The insulating portion 112 provided so as to project in the axial direction (downward in FIG. 4B) and the metal terminal 114 provided at the tip 113 of the insulating portion 112 are formed in a predetermined shape. Is. The shell 110 and the metal terminal 114 transmit power from a power source (not shown) to the lighting unit 10 (see FIG. 2A).

  As shown in FIG. 2A, the instrument main body 2 accommodates the compatible HID lamp 1 and the HID lamp socket 4 and is installed in the opening 50 of the ceiling surface 5. Light from the compatible HID lamp 1 irradiates the lower part of the instrument body 2.

  The lighting device 3 includes a lighting circuit unit 30 and a terminal unit 31. As shown in FIG. 3, the lighting circuit unit 30 includes a DC circuit 300, a smoothing circuit 301, a chopper circuit 302, an inverter circuit 303, and a load circuit 304, and is fitted to the HID lamp socket 4. Lighting control of the HID lamp 1 is performed. As shown in FIGS. 2A and 2B, the terminal portion 31 includes the other end 421 (see FIG. 1A) of the later-described receiving-side electric wire 42 and the other end 431 (see FIG. 1). 1 (a)), and the power from the power source (not shown) is transmitted to the HID lamp socket 4 through the receiving-side electric wire 42 and the center contact one-side electric wire 43. The lighting device 3 is not limited to being separated from the instrument body 2 and installed at a different position, and may be integrated with the instrument body 2 depending on the application.

  As shown in FIGS. 1 (a) and 1 (c), the HID lamp socket 4 is a screw-in socket to which a compatible HID lamp 1 (see FIG. 2 (a)) is mounted. 41, a receiving-side electric wire 42, a center contact one-side electric wire 43, an elastic member 44, a mounting plate 45, an insulating spacer 6, and an outer shell 7. The rated pulse voltage of the HID lamp socket 4 corresponds to the starting pulse voltage of the compatible HID lamp 1 and is set to 5 kV. The receiver 40 is made of, for example, a conductive material such as a metal material and is housed in a recess 72 of the outer shell 7 described later. The plate-like base 400 and the compatible HID lamp 1 provided at the center of the base 400 are provided. It is integrally provided with a threaded portion 401 that is threadedly engaged with the shell 110 (see FIG. 4B) when attached. The center contact piece 41 is formed of a conductive material such as a metal material and is accommodated in the recess 72, and contacts the metal terminal 114 (see FIG. 4B) when the compatible HID lamp 1 is mounted. Conduct.

  The receiving side electric wire 42 has one end 420 (see FIG. 6A) connected to the receiving unit 40 by spot welding, for example, and is bent at two points between the one end 420 and the other end 421. The center contact one-side electric wire 43 is connected to the center contact piece 41 at one end 430 (see FIG. 6A) by spot welding, for example, and is bent at three points between the one end 430 and the other end 431. The elastic member 44 is a coil spring whose upper end 440 is connected to the center contact piece 41, and generates a load that presses the center contact piece 41 against the metal terminal 114 (see FIG. 4B). Instead of the center contact piece 41 and the elastic member 44, one in which the center contact piece 41 and the elastic member 44 are integrally formed may be used.

  As shown in FIG. 1D, the mounting plate 45 includes a base portion 450, a pair of projecting portions 451 and 451 extending from the end portion of the base portion 450 with a step, and an end portion of the base portion 450. A pair of extended protrusions 452 and 452 is provided. Each protrusion 451 is formed with an outer fixing hole 453 to be fixed to the outer shell 7. Each protrusion 452 is provided so as to be exposed to the outside of the outer shell 7 when fixed to the outer shell 7. Each protrusion 452 is formed with an instrument body fixing hole 454 for fixing to the instrument body 2. A straight line L2 connecting the centers of the pair of fixture fixing holes 454, 454 is orthogonal to a straight line L1 connecting the centers of the pair of outer fixing holes 453, 453.

  As shown in FIG. 1 (c), the insulating spacer 6 is formed in a cylindrical shape with an elastic body of a non-magnetic material, and the receiving member 40 and the center contact piece 41 in a recess 72 of the outer shell 7 described later. It is stored between. When the compatible HID lamp 1 is not mounted, the lower end 62 of the insulating spacer 6 is in contact with the center contact piece 41. The inner diameter a1 of the insulating spacer 6 is larger than the maximum outer diameter b1 of the insulating portion 112 of the compatible HID lamp 1, as shown in FIGS. 4 (a), 4 (b), and 4 (d). It is smaller than the diameter b2. The outer diameter b2 of the lower surface 111 of the shell 110 is based on the peak of the groove. In addition, the height a2 of the insulating spacer 6 in the non-conforming lamp 8 where the outer diameter c2 of the shell 800 is the same as that of the conforming HID lamp 1 and the distance c3 from the lower surface 801 of the shell 800 to the metal terminal 804 is shorter than the conforming HID lamp 1. The distance c3 from the lower surface 801 of the shell 800 to the metal terminal 804 is equal to or more than the distance defined by JIS C 8280, and the distance b3 from the lower surface 111 of the shell 110 to the metal terminal 114 in the compatible HID lamp 1 It is as follows. In Embodiment 1, the spatial distance defined by JIS C 8280 is 4 mm. The insulating spacer 6 ensures an insulating distance between the metal receiver 40 and the center contact piece 41 when the compatible HID lamp 1 is not mounted.

  As shown in FIGS. 1A and 1C, the outer shell 7 includes a body 70 and a cover 71 combined with the body 70. The outer shell 7 accommodates the receiver 40, the center contact piece 41, the receiver side electric wire 42, the center contact piece side electric wire 43, the elastic member 44, and the insulating spacer 6 in a state where the cover 70 is combined with the body 70.

  The body 70 is formed of an insulating material such as ceramic, and includes a side wall 700 (see FIG. 6A) having a U-shaped cross section. In the vicinity of the center of the body 70, a recess 720 that opens to the upper surface 701 (see FIG. 6A) is formed. The recess 720 houses the insulating spacer 6 and the center contact piece 41 and the elastic member 44 so that the center contact piece 41 can move in the vertical direction (the left-right direction in FIG. 1C). Is done. The body 70 has a pair of mounting holes 730 and 740 (see FIG. 6A).

  The cover 71 is formed of, for example, an insulating material such as ceramic, and includes an upper surface portion 710 and a first insulating wall 711 extending downward from one end of the upper surface portion 710 (from the front to the back in FIG. 1A). , And a second insulating wall 712 extending downward from one end of the upper surface portion 710 (from the front to the rear in FIG. 1A). The upper surface portion 710 is formed with a lamp receiving port 721 into which the compatible HID lamp 1 is inserted, and a through hole 722 that is continuous with the lamp receiving port 721 and has a smaller inner diameter than the lamp receiving port 721. The first insulating wall 711 covers the portion of the receiving-side electric wire 42 excluding the other end 421 together with the side wall 700 of the body 70 (see FIG. 6A). The second insulating wall 712 covers a portion of the center contact one-side electric wire 43 excluding the other end 431 together with the side wall 700 of the body 70. The first insulating wall 711 and the second insulating wall 712 have the same height (see FIG. 1F). The cover 71 has a pair of mounting holes 731 and 741 (see FIG. 6A).

  The concave portion 720 of the body 70 and the lamp receiving port 721 and the through hole 722 of the cover 71 integrally form the concave portion 72 when the body 70 and the cover 71 are combined.

  Further, the mounting hole 730 (see FIG. 6A) of the body 70 and the mounting hole 731 of the cover 71 (see FIG. 6A) are integrated when the body 70 and the cover 71 are combined. Mounting holes 73 are formed. Similarly, the mounting hole 740 of the body 70 (see FIG. 6A) and the mounting hole 741 of the cover 71 (see FIG. 6A) are integrated with each other when the body 70 and the cover 71 are combined. Thus, the mounting hole 74 is formed. Assembly screws 732 and 742 are inserted into the mounting holes 73 and 74 together with the outer fixing hole 453. At this time, each of the assembly screws 732 and 742 is grounded via the instrument body 2 (see FIG. 2A), so that the charging part (the metal receiver 40 and the center contact piece 41) of the HID lamp socket 4 and Can secure an insulation distance.

  As shown in FIG. 1C, the outer shell 7 configured as described above has two opposing surfaces (not shown) of the body 70 that face the cover 71 when the body 70 and the cover 71 are combined. And the two opposing surfaces (not shown) of the cover 71 facing the body 70, the receiving-side electric wire 42 is sandwiched and the tension is stopped. Specifically, a part of the receiving-side electric wire 42 is sandwiched between one opposing surface of the body 70 and one opposing surface of the cover 71 to perform the first tension stop. At the same time, the other opposing surface of the body 70 and the other opposing surface of the cover 71 sandwich the other part of the receiving side electric wire 42 to perform the second tension stop. At this time, the receiving-side electric wire 42 is sandwiched at an angle different from the one opposing surface and the other opposing surface.

  Further, when the body 70 and the cover 71 are combined, two facing surfaces (not shown) of the body 70 facing the cover 71 and two facing surfaces (not shown) of the cover 71 facing the body 70. Thus, the center contact one-sided electric wire 43 is clamped and the tension is stopped. Specifically, a part of the center contact one-side electric wire 43 is sandwiched between one opposing surface of the body 70 and one opposing surface of the cover 71 to perform the third tension stop. At the same time, the other opposing surface of the body 70 and the other opposing surface of the cover 71 sandwich the other part of the center contact one-side electric wire 43 to perform the fourth tension stop. At this time, the center contact single-sided electric wire 43 is sandwiched at an angle different from the one facing surface and the other facing surface.

  As shown in FIGS. 1A and 1F, the other end 421 of the receiving-side electric wire 42 and the other end 431 of the central contact one-side electric wire 43, which are tensioned by the outer shell 7, have the same direction and It is pulled out to the outside at a position close to the mounting hole 74 of the outer shell 7 at the same height, that is, from both sides of the assembly screw 742. At this time, the receiving-side electric wire 42 and the center contact one-side electric wire 43 are drawn out from the inside from the protruding portion 713 of the cover 71 to the outside.

  Next, a method for assembling the HID lamp socket 4 of Embodiment 1 will be described with reference to FIG. First, the center contact piece 41, the center contact piece side electric wire 43, the elastic member 44, and the insulating spacer 6 are accommodated in the body 70 of the outer shell 7. Subsequently, the body 70 is covered with a cover 71 to store the money receiver 40 and the money receiver-side electric wire 42. At this time, the assembly screws 732 and 742 are inserted into the mounting holes 73 and 74 and the outer fixing holes 453 and 453, thereby fixing the body 70, the cover 71, and the mounting plate 45 with screws. Thus, the HID lamp socket 4 as shown in FIG. 5 is completed.

  Next, the case where the compatible HID lamp 1 and the non-conforming lamp 8 are mounted on the HID lamp socket 4 of Embodiment 1 will be described with reference to FIG. The socket 4 for the HID lamp is as shown in FIG. 4A, and the height a2 of the insulating spacer 6 needs to be 8 mm or more and 11.2 mm or less, and is 9 mm here. The rated pulse voltage of the HID lamp socket 4 is 5 kV. First, the case where the compatible HID lamp 1 is mounted will be described. The compatible HID lamp 1 has a base 11 as shown in FIG. When the compatible HID lamp 1 is mounted on the HID lamp socket 4 as shown in FIG. 4 (c), the shell 110 and the metal receiver 40 are screwed together, and when further screwed, the metal terminal 114 is connected to the center contact piece 41. In addition, the base reference line 115 comes into contact with the bottom surface 724 of the lamp receiving port 721. At this time, electric power is supplied from the receiver 40 and the center contact piece 41 to the compatible HID lamp 1, and the compatible HID lamp 1 is turned on.

  Subsequently, a case where the nonconforming lamp 8 is mounted will be described. As shown in FIG. 4D, the non-conforming lamp 8 includes an E10 base, and a distance c3 from the lower surface 801 of the shell 800 to the metal terminal 804 is 4 mm. Unlike the compatible HID lamp 1, the non-compatible lamp 8 does not have a base reference surface. In addition, the shape of E10 nozzle | cap | die is prescribed | regulated by JISC7709-1: 1997 1-15-1. As shown in FIG. 4E, when the incompatible lamp 8 is mounted on the HID lamp socket 4, the shell 800 and the receiver 40 are screwed together. Thereafter, the lower surface 801 of the shell 800 contacts the insulating spacer 6. Here, in JIS C 8280 and IEC 60238, the required insulation distance is determined for each applied voltage (rated pulse voltage), and there is a space between the metal terminal 804 of the nonconforming lamp 8 and the center contact piece 41 of the HID lamp socket 4. It is desirable to keep the distance. For example, it is desirable to maintain a spatial distance of 4 mm or more at a rated pulse voltage of 5 kV. When the lower surface 801 of the shell 800 is in contact with the insulating spacer 6, the distance between the metal terminal 804 and the center contact piece 41 is 5 mm, and the spatial distance defined by the JIS standard when the rated pulse voltage is 5 kV is 4 mm. Secure. Further, since the metal terminal 804 and the center contact piece 41 are not in contact with each other, power is not supplied to the non-conforming lamp 8, and the non-conforming lamp 8 does not light up.

  As described above, according to the first embodiment, the outer diameter c2 of the shell 800 is the same as that of the compatible HID lamp 1, and the distance c3 from the lower surface 801 of the shell 800 to the metal terminal 804 is shorter than that of the compatible HID lamp 1 (for example, a base standard) Even if the E10 base lamp having no surface is inserted by mistake, the lower surface 801 of the shell 800 of the nonconforming lamp 8 can be brought into contact with the insulating spacer 6, so that the nonconforming lamp 8 can be discharged or lit. Can be prevented. On the other hand, when the compatible HID lamp 1 is inserted, since the inner diameter a1 of the insulating spacer 6 is larger than the maximum outer diameter b1 of the insulating portion 112, there is no interference and the metal terminal 114 and the center contact piece 41 are in contact with each other. Conduct.

  Further, even if the non-conforming lamp 8 is erroneously inserted into the HID lamp socket 4, the spatial distance defined by the JIS standard between the metal terminal 804 of the non-conforming lamp 8 and the center contact piece 41 of the HID lamp socket 4. Can be secured.

  As a modification of the first embodiment, the rated pulse voltage of the HID lamp socket 4 may be other than 5 kV. The rated pulse voltage of the socket 4 for the HID lamp is not limited to 5 kV, and is set as appropriate according to the specification and application of the compatible HID lamp 1. The spatial distance changes according to the magnitude of the rated pulse voltage, and the height a2 of the insulating spacer 6 is determined based on the change in the spatial distance.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram illustrating a socket for an HID lamp according to the second embodiment.

  Although the lighting fixture of Embodiment 2 is equipped with the adaptation HID lamp 1, the fixture main body 2, and the lighting device 3, similarly to the lighting fixture of Embodiment 1 (refer Fig.2 (a)), Embodiment 1 is provided. The lighting apparatus has the following characteristic portions that are not included in the lighting fixture.

  The lighting fixture of Embodiment 2 is provided with an HID lamp socket 4a as shown in FIG. 6A in place of the HID lamp socket 4 of Embodiment 1 (see FIG. 1). The HID lamp socket 4a includes an insulating spacer 6a as shown in FIG. The insulating spacer 6a is integrally provided with a cylindrical portion 60 and four ribs 61,... Provided so as to protrude from the inner wall 600 of the cylindrical portion 60 in the center direction. The cylindrical portion 60 has a shape in which the outer wall 601 is matched with the insulating spacer accommodating portion 723 (see FIG. 6C) of the concave portion 72 of the outer shell 7, and the outer wall 601 is in contact with the inner surface of the concave portion 72. The insulating spacer 6a has an inner diameter of the insulating spacer 6a that is twice the distance from the center to the tip of each rib 61. That is, the diameter of a circle A having the same central axis as the insulating spacer 6a and inscribed in each rib is defined as the inner diameter. The HID lamp socket 4a is the same as the HID lamp socket 4 of the first embodiment except for the points described above.

  As described above, according to the second embodiment, the outer dimension of the insulating spacer 6a can be freely determined according to the dimension of the recess 72 of the outer shell 7, the application, and the like.

  As a modification of the second embodiment, the number of ribs 61 of the insulating spacer 6a may be other than four (for example, one place or six places).

BRIEF DESCRIPTION OF THE DRAWINGS It is the socket for HID lamps of Embodiment 1 by this invention, Comprising: (a) is a top view, (b) is a left view, (c) is sectional drawing, (d) is a bottom view, (e) is a front view. (F) is a rear view. It is a lighting fixture same as the above, (a) is a side view, (b) is a top view of a lighting device. It is a circuit diagram of a lighting device same as the above. It is a figure which shows the mounting state of each lamp | ramp to the socket for HID lamps same as the above. It is an external appearance perspective view of the socket for HID lamps same as the above. It is the socket for HID lamps of Embodiment 2 by this invention, (a) is a disassembled perspective view, (b) is an enlarged view of an insulating spacer, (c) is an enlarged view of the outer body. It is the schematic of the socket for the conventional HID lamp.

Explanation of symbols

40 Receipt 41 Center contact piece 6, 6a Insulating spacer 7

Claims (4)

A base having a predetermined shape having a metal shell formed with a groove for screwing, an insulating portion protruding from one end surface of the shell, and a metal terminal provided at the tip of the insulating portion. A socket for a HID lamp to which a predetermined compatible HID lamp provided with
An insulative shell having a recess opened in one surface and into which the compatible HID lamp is inserted;
A receiver that is housed in the recess and is threadedly connected to the shell when the compatible HID lamp is mounted;
A central contact piece that is housed in the recess and is in electrical contact with the metal terminal when the compatible HID lamp is mounted;
Formed in a cylindrical shape, the inner diameter is larger than the maximum outer diameter of the insulating portion and smaller than the outer diameter of one end face of the shell, and the height is the same as the adapted HID lamp. The distance to the metal terminal is not less than the distance from one end surface of the shell to the metal terminal in the non-conforming lamp shorter than the compatible HID lamp, and not more than the distance from the one end surface of the shell to the metal terminal in the compatible HID lamp. A socket for an HID lamp, comprising: an insulating spacer which is housed in contact with the center contact piece between the metal receiver and the center contact piece.   The height of the insulating spacer is not less than a distance obtained by adding a spatial distance defined in JIS C 8280 to the distance from one end surface of the shell in the nonconforming lamp to the metal terminal, and from the one end surface of the shell in the compatible HID lamp to the metal. 2. The socket for an HID lamp according to claim 1, wherein the socket is not more than a distance to the terminal.   The insulating spacer includes at least a rib protruding in the center direction from the inner wall on the other end side, abuts the inner surface of the recess at the outer wall, and doubles the distance from the center to the tip of the rib. The socket for an HID lamp according to claim 1 or 2, wherein the socket has an inner diameter. The socket for HID lamps in any one of Claims 1-3,
A lighting apparatus comprising: a lighting device that controls lighting of the compatible HID lamp mounted in the socket for the HID lamp.

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