Power supply socket and lighting device

Abstract

To provide a power supply socket capable of improving electrical connection of a power supply terminal to a conductive part.SOLUTION: The power supply socket 1 includes a base part 110 and a spring part 14. The base portion 110 has a first insertion hole H1 and a guide hole H3. The power supply terminals 21 are inserted into the first insertion holes H1. The guide hole H3 guides the power feeding terminals 21 inserted into the first insertion holes H1 to connection positions M1 at which the power feeding terminals 21 are connected to the conductive portion 13. The spring part 14 has a fixed end piece 141, a free end piece 143, and a spring piece 142. The spring piece 142 has a projection 15. The protrusion 15 comes into contact with the power feeding terminals 21 disposed at the connection position M1 from the side of the first insertion hole H1. The fixed end piece 141 is disposed closer to the first insertion hole H1 side than the protrusion 15. A force that moves the power feeding terminals 21 from the first insertion holes H1 toward the connection positions M1 is defined as a first force F1. A force that moves the power feeding terminals 21 from the connection position M1 toward the first insertion hole H1 is defined as a second force. The second force is greater than the first force F1.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a power socket and a lighting device. More particularly, the present disclosure relates to a power socket to which a light source unit is detachably attached, and a lighting device including the power socket. [Background technology]

[0002] Patent Document 1 discloses a socket into which a terminal pin of a lamp unit is inserted. The socket has a terminal portion that electrically connects with the inserted terminal pin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 005244 Summary of the Invention [Problem to be solved by the invention]

[0004] In the socket (power supply socket) described in Patent Document 1, it is desired to reduce the size in a direction intersecting the direction in which the terminal pins (power supply terminals) of the lamp unit (light source unit) are inserted.

[0005] However, if the socket is made smaller in size in a direction intersecting the insertion direction of the terminal pins of the lamp unit, the rotational force (e.g., torque) required to attach or detach the lamp unit to or from the socket will be reduced, which may result in a deterioration in the electrical connection between the terminal pins of the lamp unit attached to the socket and the terminal portion (conductive portion).

[0006] An object of the present disclosure is to provide a power supply socket and a lighting device that can improve the electrical connection of a power supply terminal to a conductive part. [Means for solving the problem]

[0007] A power feed socket according to one aspect of the present disclosure includes a base, a spring portion, and a conductive portion. A light source unit is detachably attached to the base. The spring portion is fixed to the base. The conductive portion is electrically connected to a power feed terminal of the light source unit. The base has a first insertion hole and a guide hole. The power feed terminal is inserted into the first insertion hole. The guide hole guides the power feed terminal inserted into the first insertion hole to a connection position where it is electrically connected to the conductive portion. The spring portion has a fixed end piece, a free end piece, and a spring piece. The fixed end piece is fixed to the base. The free end piece is movable relative to the base. The spring piece connects the fixed end piece and the free end piece. The spring piece has a protrusion. The protrusion elastically contacts the power feed terminal arranged at the connection position from the side of the first insertion hole. The fixed end piece is positioned closer to the first insertion hole than the protrusion. A force that moves the power supply terminal from the first insertion hole side toward the connection position side so as to overcome the protrusion is defined as a first force. A force that moves the power supply terminal from the connection position side toward the first insertion hole side so as to overcome the protrusion is defined as a second force. In this case, the second force is greater than the first force.

[0008] A power feed socket according to one aspect of the present disclosure includes a base, a spring portion, and a conductive portion. A light source unit is detachably attached to the base. The spring portion is fixed to the base. The conductive portion is electrically connected to a power feed terminal of the light source unit. The base has a first insertion hole and a guide hole. The power feed terminal is inserted into the first insertion hole. The guide hole guides the power feed terminal inserted into the first insertion hole to a connection position where it is electrically connected to the conductive portion. The spring portion has a fixed end piece, a free end piece, and a spring piece. The fixed end piece is fixed to the base. The free end piece is movable relative to the base. The spring piece connects the fixed end piece and the free end piece. The spring piece has a protrusion. The protrusion elastically contacts the power feed terminal arranged at the connection position from the side of the first insertion hole. The protrusion has a first inclined surface and a second inclined surface. The first inclined surface faces the first insertion hole. The second inclined surface faces the connecting position. The coefficient of friction of the second inclined surface is greater than the coefficient of friction of the first inclined surface.

[0009] An illumination device according to one aspect of the present disclosure includes the power supply socket and the light source unit. [Effects of the Invention]

[0010] According to the power feed socket and lighting device according to one aspect of the present disclosure, it is possible to improve the electrical connection of the power feed terminal with the conductive portion. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a lighting device according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the lighting device. [Figure 3] FIG. 3 is another exploded perspective view of the lighting device. [Figure 4] FIG. 4 is an exploded perspective view of the power supply socket according to the embodiment. [Figure 5] FIG. 5 is a plan view of the power supply socket. [Figure 6] FIG. 6 is a plan view of the power supply socket with the second housing removed. [Figure 7] FIG. 7 is another plan view of the power supply socket with the second housing removed. [Figure 8] FIG. 8 is a cross-sectional view of the power supply socket. [Figure 9] FIG. 9 is a cross-sectional view of the power supply socket of the same as above, with a light source unit attached thereto. [Figure 10] FIG. 10 is a plan view showing the protrusion of the spring piece of the first modified example. [Figure 11] FIG. 11 is a plan view showing the protrusion of the spring piece of the second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a power supply socket and a lighting device according to an embodiment will be described with reference to the drawings. The drawings referred to in the following embodiments are schematic diagrams, and the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensions, and the size and thickness ratios between the components do not necessarily reflect the actual dimensional ratios.

[0013] (Embodiment) (1) Overview First, an outline of a power socket 1 and a lighting device 100 according to an embodiment will be described with reference to FIGS.

[0014] The lighting device 100 according to the embodiment is, for example, a downlight that is embedded in the ceiling of a facility and emits light vertically downward. The facility may be, for example, a residential facility such as a detached house or an individual unit in an apartment building, or a non-residential facility such as a factory, a store, an office building, a commercial building, a hospital, or a school. In this embodiment, as an example, the facility is a detached house.

[0015] 1 to 3, the lighting device 100 according to the embodiment includes a power feed socket 1 and a light source unit 2. The lighting device 100 further includes a cover member 6, a terminal block 7, and an attachment member 8. The light source unit 2 is detachably attached to the power feed socket 1.

[0016] As shown in FIG. 4, the power feed socket 1 includes a bottom 110 (base), a spring portion 14, and a conductive portion 13. The light source unit 2 is detachably attached to the bottom 110. The spring portion 14 is fixed to the bottom 110. The conductive portion 13 is electrically connected to a power feed terminal 21 of the light source unit 2. The bottom 110 includes a first insertion hole H1 and a guide hole H3. The power feed terminal 21 is inserted into the first insertion hole H1. The guide hole H3 guides the power feed terminal 21 inserted into the first insertion hole H1 to a connection position M1 where the power feed terminal 21 is electrically connected to the conductive portion 13. The spring portion 14 includes a fixed end piece 141, a free end piece 143, and a spring piece 142. The fixed end piece 141 is fixed to the bottom 110. The free end piece 143 is movable relative to the bottom 110. The spring piece 142 connects the fixed end piece 141 and the free end piece 143. The spring piece 142 has a protrusion 15. The protrusion 15 elastically contacts the power supply terminal 21, which is located at the connection position M1, from the first insertion hole H1 side. The fixed end piece 141 is located closer to the first insertion hole H1 than the protrusion 15. A force that moves the power supply terminal 21 from the first insertion hole H1 side toward the connection position M1 side so as to overcome the protrusion 15 is defined as a first force F1 (see FIG. 6). A force that moves the power supply terminal 21 from the connection position M1 side toward the first insertion hole H1 side so as to overcome the protrusion 15 is defined as a second force F2 (see FIG. 7). In this case, the second force F2 is greater than the first force F1.

[0017] With this configuration, the fixed end piece 141 is disposed closer to the first insertion hole H1 than the protrusion 15, so the second force F2 can be made greater than the first force F1. Furthermore, since the second force F2 is greater than the first force F1, the electrical connection of the power supply terminal 21 to the conductive portion 13 can be improved.

[0018] (2) Details Next, components of the power socket 1 and the lighting device 100 according to the embodiment will be described with reference to FIGS.

[0019] In the following description, unless otherwise specified, the front-rear direction, left-right direction, and up-down direction (vertical direction) indicated by arrows in Figures 1 to 3 are defined as the front-rear direction, left-right direction, and up-down direction of the lighting device 100 and its components, respectively. However, these directions are not intended to limit the directions of the lighting device 100 and its components when in use. Furthermore, the arrows indicating "up," "down," "left," "right," "front," and "back" in Figures 1 to 3 are merely shown for the purpose of explanation and do not have any physical substance.

[0020] As described above, the lighting device 100 according to the embodiment is, for example, a downlight that is recessed into the ceiling of a facility and emits light vertically downward. As shown in FIGS. 1 to 3 , the lighting device 100 according to the embodiment includes a power socket 1 and a light source unit 2. The lighting device 100 further includes a cover member 6, a terminal block 7, and an attachment member 8.

[0021] (2.1) Power socket The power feed socket 1 is a device that supplies power to the light source unit 2. As shown in FIGS. 2 to 4, the power feed socket 1 includes a housing 10. As shown in FIG. 4, the housing 10 includes a first housing 11 and a second housing 12. The housing 10 is configured by combining the first housing 11 and the second housing 12 in one direction (the up-down direction). That is, the power feed socket 1 according to the embodiment includes the first housing 11 and the second housing 12.

[0022] 4, 6, and 7, the power feed socket 1 further includes a pair of conductive parts 13 and a pair of spring parts 14. The pair of conductive parts 13 and the pair of spring parts 14 are housed in an internal space Sp1 (see FIG. 8) of the housing 10. Note that FIGS. 6 and 7 are plan views of the power feed socket 1 and the light source unit 2 when the second housing 12 is removed from the power feed socket 1 with the light source unit 2 attached.

[0023] (2.1.1) First enclosure The first housing 11 is formed of an insulating material such as synthetic resin. The first housing 11 is, for example, cylindrical with one surface (top surface) open and the opposite surface (bottom surface) closed. As shown in FIGS. 4, 6, and 7, the first housing 11 has a bottom 110, an inner wall 111, and an outer wall 115.

[0024] The bottom portion 110 is formed, for example, in a disk shape. As shown in Figures 6 and 8, the bottom portion 110 has a first surface S1 and a second surface S2 that face each other in the up-down direction. In this embodiment, the first surface S1 is the upper surface of the bottom portion 110, and the second surface S2 is the lower surface of the bottom portion 110. As shown in Figures 6 and 7, the bottom portion 110 is provided with a pair of first insertion holes H1, a pair of guide holes H3, and a second insertion hole H2.

[0025] Each of the pair of first insertion holes H1 is a circular through-hole that penetrates the bottom 110 in the thickness direction (vertical direction) of the bottom 110. The diameter of each first insertion hole H1 is larger than the diameter of a large-diameter portion 212 of a power supply terminal 21, which will be described later (see FIGS. 6 and 7). The pair of first insertion holes H1 are provided at positions that are point-symmetrical with respect to the center C1 of the bottom 110. In each of the pair of first insertion holes H1, a corresponding one of the pair of power supply terminals 21 is inserted facing upward.

[0026] Each of the pair of guide holes H3 is a through-hole that penetrates the bottom portion 110 in the thickness direction (vertical direction) of the bottom portion 110. In a plan view from the vertical direction, each guide hole H3 is formed in an arc shape centered on the center C1 of the bottom portion 110. The pair of guide holes H3 are provided at positions that are point-symmetric with respect to the center C1 of the bottom portion 110. Here, the pair of guide holes H3 correspond one-to-one to the pair of first insertion holes H1. Each of the pair of guide holes H3 is connected to the corresponding one of the pair of first insertion holes H1. More specifically, each guide hole H3 extends from the corresponding first insertion hole H1 along a circular path centered on the center C1 of the bottom portion 110. The width of each guide hole H3 (the length in the radial direction of the bottom portion 110) is smaller than the diameter of the large diameter portion 212 of the power supply terminal 21 and larger than the diameter of the small diameter portion 211 of the power supply terminal 21 (see FIGS. 6 and 7). With this, with the corresponding large diameter portion 212 of the pair of large diameter portions 212 inserted into each of the pair of first insertion holes H1, the light source unit 2 can be rotated about the center C1 of the bottom portion 110 to move each power supply terminal 21 along each guide hole H3. At this time, because the width of the guide hole H3 is smaller than the diameter of the large diameter portion 212 of the power supply terminal 21, downward movement of the light source unit 2 is restricted.

[0027] The pair of guide holes H3 guide the pair of power supply terminals 21 inserted into the pair of first insertion holes H1 to a pair of connection positions M1 where the pair of power supply terminals 21 are electrically connected to the pair of conductive portions 13.

[0028] The second insertion hole H2 is a circular through-hole that penetrates the bottom 110 in the thickness direction (vertical direction) of the bottom 110. The second insertion hole H2 is provided between the pair of first insertion holes H1 in the radial direction of the bottom 110. The second insertion hole H2 is provided at a position where the center of the second insertion hole H2 coincides with the center C1 of the bottom 110. The diameter of the second insertion hole H2 is larger than the diameter of a protrusion 22 (described below) of the light source unit 2. When the pair of power supply terminals 21 are inserted into the pair of first insertion holes H1, the protrusion 22 is inserted upward into the second insertion hole H2. That is, in the power supply socket 1 according to the embodiment, the first housing 11 has the second insertion hole H2 into which the protrusion 22 of the light source unit 2 is inserted.

[0029] As shown in FIGS. 4, 6 to 8, the inner wall portion 111 has a pair of guide walls 112, a pair of groove portions 113, and a pair of restriction portions 114.

[0030] The pair of guide walls 112 extend upward from a peripheral edge H20 (see FIG. 6) of the second insertion hole H2. The pair of guide walls 112 are provided at positions point-symmetrical with respect to the center C1 of the bottom 110. The pair of guide walls 112 guide the protrusion 22 inserted upward through the second insertion hole H2. As shown in FIG. 8, when the first housing 11 and the second housing 12 are combined, the tips of the guide walls 112 face the bottom 120 of the second housing 12 with a small gap between them. That is, in the power feed socket 1 according to the embodiment, the first housing 11 further has a guide wall 112 (first side wall) that protrudes from the opening edge (peripheral edge H20) of the second insertion hole H2 toward the second housing 12 (upper side).

[0031] The pair of grooves 113 are grooves recessed in opposite directions from the periphery H20 of the second insertion hole H2 in a plan view from the vertical direction. The pair of grooves 113 are grooves extending in the vertical direction. The pair of grooves 113 are provided at positions that are point-symmetric with respect to the center C1 of the bottom portion 110.

[0032] When the protrusion 22 is inserted upward into the second insertion hole H2, a pair of protrusions 24 (described below) that protrude in opposite directions from the side surfaces of the protrusion 22 are inserted into the pair of grooves 113, as shown in Figure 6.

[0033] The pair of restricting portions 114 extend upward from the periphery H20 of the second insertion hole H2. That is, the pair of restricting portions 114 are arc-shaped in a plan view from the vertical direction. As described above, the second insertion hole H2 is provided between the pair of first insertion holes H1. That is, the pair of restricting portions 114 extending upward from the periphery H20 of the second insertion hole H2 are located inside the pair of guide holes H3 that are respectively connected to the pair of first insertion holes H1 in a plan view from the vertical direction.

[0034] As shown in FIG. 8, the pair of restricting portions 114 are adjacent to the pair of grooves 113 in the circumferential direction around the center C1. The pair of restricting portions 114 are provided at positions that are point-symmetrical with respect to the center C1 of the bottom portion 110. Here, the length of the restricting portions 114 in the vertical direction is shorter than the length of the guide wall 112 in the vertical direction. As a result, when the first housing 11 and the second housing 12 are combined, a gap G1 that is continuous with the grooves 113 is formed between the restricting portions 114 and the bottom portion 120 of the second housing 12. In other words, a pair of gaps G1 are formed in the housing 10. The protrusions 24 inserted into the grooves 113 are aligned with the center C1 of the bottom portion 110. By rotating the light source unit 2 around the center 1, the light source unit 2 moves in a state of contact with the restricting portion 114 in the gap G1.

[0035] When the pair of power supply terminals 21 are guided to the pair of connection positions M1 by the pair of guide holes H3, the pair of regulating portions 114 come into contact with the pair of protrusions 24, respectively, thereby regulating the downward movement of the protrusions 22.

[0036] The outer wall 115 extends upward from the entire periphery of the outer periphery of the bottom 110 .

[0037] The bottom 110, the inner wall 111, the outer wall 115, and the bottom 120 of the second housing 12 define an internal space Sp1 in which a pair of conductive parts 13 and a pair of spring parts 14 are housed.

[0038] 8, the first housing 11 has a pair of holding portions 1100 that protrude from the first surface S1 on the upper side of the bottom portion 110. The pair of holding portions 1100 hold the pair of conductive portions 13, respectively.

[0039] As shown in FIG. 6, the holding portion 1100 has a fixing groove 1101 that extends downward. A fixing piece 131 of the conductive portion 13 is inserted into the fixing groove 1101. As shown in FIG. 8, the holding portion 1100 further has an insertion hole B1 into which the electric wire W1 inserted downward into the electric wire insertion hole H4 is inserted. The insertion hole B1 is a hole with a bottom. The electric wire W1, which is inserted downward into the electric wire insertion hole H4 and is electrically connected to the conductive portion 13 held by the holding portion 1100, is inserted into the insertion hole B1. The electric wire W1 is inserted into the insertion hole B1 until the tip of the electric wire W1 contacts the bottom surface of the insertion hole B1. Note that the electric wire W1 may be fixed by the sheath portion contacting a tapered portion provided in the electric wire insertion hole H4 before the tip of the electric wire W1 contacts the bottom surface of the insertion hole B1.

[0040] (2.1.2) Second housing The second housing 12 is formed of an insulating material such as synthetic resin. The second housing 12 is, for example, cylindrical with an opening OP1 on one surface (bottom surface) and a closed surface (top surface) on the opposite side. The first housing 11 is attached to the second housing 12 so as to close the opening OP1. As shown in FIGS. 4 and 8, the second housing 12 includes a bottom portion 120, a pair of guide portions 121, and an outer wall portion 122.

[0041] The bottom 120 is formed, for example, in a disk shape. The bottom 120 has a first surface S3 and a second surface S4 that face each other in the up-down direction. In this embodiment, the first surface S3 is the lower surface of the bottom 120, and the second surface S4 is the upper surface of the bottom 120. When the first housing 11 and the second housing 12 are combined, the bottom 120 faces the bottom 110 of the first housing 11 in the up-down direction, with the internal space Sp1 between them.

[0042] The bottom 120 is provided with a pair of wire insertion holes H4. One of the pair of wires W1 drawn from the terminal block 7 is inserted downward into each of the pair of wire insertion holes H4. The pair of wires W1 inserted into the pair of wire insertion holes H4 extends downward in the internal space Sp1. Therefore, there is no need to expand the internal space Sp1 of the power feed socket 1 in a direction intersecting the up-down direction (e.g., the left-right direction) to route the wires W1, and the power feed socket 1 and the lighting device 100 can be made smaller in the direction intersecting the up-down direction.

[0043] As shown in FIG. 5 , each of the pair of wire insertion holes H4 is positioned so as not to overlap with the first insertion hole H1 and the guide hole H3 in a top-bottom plan view. More specifically, each wire insertion hole H4 is positioned on the opposite side of the guide hole H3 from the first insertion hole H1 in a top-bottom plan view. Here, the guide hole H3 is a hole that guides the power supply terminal 21 inserted into the first insertion hole H1 to the connection position M1 where the power supply terminal 21 is electrically connected to the conductive portion 13. In other words, each conductive portion 13 is positioned on the opposite side of the guide hole H3 from the first insertion hole H1 in a top-bottom plan view. As a result, each wire insertion hole H4 is positioned so as to overlap with the conductive portion 13 in a top-bottom plan view. This shortens the path that the wire W1 inserted into each wire insertion hole H4 takes to be connected to the conductive portion 13. Furthermore, the vertical length of the conductive portion 13 can be shortened, or the shape of the conductive portion 13 can be simplified.

[0044] In addition, each wire insertion hole H4 is located on an arc-shaped extension of the corresponding guide hole H3 in a top-bottom plan view. More specifically, each wire insertion hole H4 is located on an imaginary circle CL1 that includes an extension of the corresponding guide hole H3. This allows the power supply terminal 21 to be electrically connected to the conductive portion 13 to which the electric wire W1 is connected through the wire insertion hole H4 by moving the power supply terminal 21 along the guide hole H3.

[0045] The bottom 120 is also provided with an inner wall 124 (see FIG. 8 ). The inner wall 124 protrudes downward from the first surface S3 of the bottom 120. More specifically, the inner wall 124 protrudes downward from the outer edge of the lid 1201. The inner wall 124 is formed in an annular shape when viewed from above in the vertical direction. That is, in the power supply socket 1 according to the embodiment, the second housing 12 further has an inner wall 124 (second side wall) protruding from the outer edge of the lid 1201 toward the first housing 11 (downward). When the first housing 11 is attached to the second housing 12, the guide wall 112 (first side wall) and the inner wall 124 (second side wall) overlap in the vertical direction (insertion direction) (see FIG. 8 ). This makes it possible to prevent foreign matter from entering the housing 10.

[0046] The pair of electric wires W1 inserted into the pair of electric wire insertion holes H4 are electrically connected to the pair of conductive parts 13 housed in the internal space Sp1, respectively.

[0047] The pair of guide portions 121 protrude upward from the upper second surface S4 of the bottom portion 120. Each of the pair of guide portions 121 has an electric wire guide portion 1211 and a reinforcing portion 1212, as shown in FIG.

[0048] The wire guide portion 1211 is an annular portion that protrudes upward from the periphery of the wire insertion hole H4. The wire guide portion 1211 guides the wire W1, which is inserted downward, into the wire insertion hole H4. The wire W1 is guided by the guide portion 1211, so that the wire W1 can be reliably inserted into the wire insertion hole H4. Furthermore, the wire W1 can be reliably connected to the conductive portion 13.

[0049] Furthermore, as described above, the guide portion 121 is formed of an insulating material. Therefore, the guide portion 121 can insulate the portion of the electric wire W1 inserted into the internal space Sp1 from the outside. Furthermore, the insulation between the portion of the electric wire W1 inserted into the internal space Sp1 and the outside is realized by the guide portion 121 protruding upward from the second surface S4 of the bottom portion 120, and it is possible to prevent the dimension of the entire second housing 12 from increasing in the vertical direction. As a result, it is possible to prevent the dimension of the lighting device 100 from increasing in the vertical direction.

[0050] Reinforcing portion 1212 is a rail-shaped portion extending from wire guide portion 1211 above bottom portion 120. At the tip of reinforcing portion 1212, as shown in FIG.

[0051] Outer wall portion 122 extends downward from the entire periphery of the outer edge portion of bottom portion 120. Outer wall portion 122 is disposed inside outer wall portion 115 of first housing 11 when first housing 11 and second housing 12 are combined together (see FIG. 8).

[0052] Here, as shown in FIG. 4, the power feed socket 1 according to the embodiment includes a lid 1201. The lid 1201 is a part of the bottom 120 of the second housing 12. More specifically, as shown in FIGS. 4 and 5, the lid 1201 is a circular portion surrounded by a two-dot chain line and is provided at the center of the bottom 120. The outer diameter of the lid 1201 is slightly larger than the diameter (opening diameter) of the second insertion hole H2 provided in the first housing 11. Therefore, when the first housing 11 is attached to the second housing 12, the second insertion hole H2 is blocked by the lid 1201 in the up-down direction. This makes it possible to prevent a user from touching the charging portion of the power feed socket 1 before the light source unit 2 is attached.

[0053] That is, the power feed socket 1 according to the embodiment includes a lid 1201 that overlaps with the second insertion hole H2 in a plan view from the insertion direction when the first housing 11 is attached to the second housing 12. Furthermore, in the power feed socket 1 according to the embodiment, the lid 1201 is part of a portion (bottom 120) of the second housing 12 that faces the second insertion hole H2 of the first housing 11. The insertion direction is the direction in which the protrusion 22 of the light source unit 2 is inserted into the second insertion hole H2 of the first housing 11, which is the up-and-down direction in this embodiment.

[0054] 4, the cover 1201 has a through-hole 123 that penetrates the bottom 120 in the thickness direction (vertical direction) of the bottom 120. By providing the through-hole 123, it becomes possible to adjust the internal pressure of the housing 10.

[0055] (2.1.3) A pair of conductive parts Each of the pair of conductive parts 13 is formed of, for example, a plate-shaped metal member. The pair of conductive parts 13 are provided at positions that are point-symmetric with respect to the center C1 of the bottom part 110 of the first housing 11, as shown in Figs. 6 and 7 .

[0056] Each of the pair of conductive parts 13 has a fixed piece 131, an insertion piece 132, and a terminal contact piece 133. In this embodiment, the fixed piece 131, the insertion piece 132, and the terminal contact piece 133 are integrally formed.

[0057] The fixing pieces 131 are formed, for example, in a flat plate shape. The fixing pieces 131 are inserted downward into the fixing grooves 1101 of the holding part 1100. This fixes the conductive parts 13 to the first housing 11. Here, each conductive part 13 is fixed to a position in the first housing 11 adjacent to the end of the corresponding guide hole H3 on the opposite side from the first insertion hole H1 side.

[0058] The terminal contact piece 133 protrudes toward the guide hole H3 from one end (the lower end in this embodiment) of the fixed piece 131 fixed to the first housing 11. Here, the large diameter portion 212 of the power supply terminal 21, which is inserted through the first insertion hole H1 and moved along the guide hole H3, comes into contact with the terminal contact piece 133. As a result, the power supply terminal 21 is electrically connected to the conductive portion 13. Here, as described above, the fixed piece 131 is inserted into the fixing groove 1101 of the holding part 1100, and the conductive portion 13 is fixed to the first housing 11. Therefore, when the power supply terminal 21 is electrically connected to the conductive portion 13, movement of the conductive portion 13 is restricted. In other words, the holding part 1100 holds the conductive portion 13 so as to restrict movement of the conductive portion 13 when the power supply terminal 21 is electrically connected to the conductive portion 13. This makes it possible to prevent the conductive portion 13 from moving when the power supply terminal 21 is moved along the guide hole H3 to connect to the conductive portion 13, due to the conductive portion 13 being pressed by the power supply terminal 21.

[0059] The insertion piece 132 protrudes from the other end (upper end in this embodiment) of the fixed piece 131 toward the opposite side to the guide hole H3. The electric wire W1 inserted through the electric wire insertion hole H4 is clamped between the insertion piece 132 and the fixed piece 131. As a result, the pair of electric wires W1 inserted through the pair of electric wire insertion holes H4 are electrically connected to the pair of conductive portions 13 housed in the internal space Sp1, respectively. As a result, commercial power is input from an external power source to the pair of conductive portions 13 via the pair of electric wires W1 inserted through the pair of electric wire insertion holes H4.

[0060] (2.1.4) A pair of spring parts The pair of spring portions 14 are formed, for example, from a plate-shaped metal member. As shown in Figures 6 and 7, the pair of spring portions 14 are provided at positions that are point-symmetric with respect to the center C1 of the bottom portion 110 of the first housing 11. The pair of spring portions 14 are fixed to the bottom portion 110.

[0061] Each of the pair of spring portions 14 has a fixed end piece 141, a spring piece 142, and a free end piece 143. In this embodiment, the fixed end piece 141, the spring piece 142, and the free end piece 143 are integrally formed.

[0062] The fixed end piece 141 is, for example, a plate-like member formed in a hook shape. The fixed end piece 141 is fixed to the first housing 11 by being hooked onto a columnar portion 1102 provided on the bottom 110 of the first housing 11. The columnar portion 1102 is arranged, for example, around the first insertion hole H1 on the bottom 110. More specifically, the columnar portion 1102 is provided on the opposite side of the first insertion hole H1 from the guide hole H3. Therefore, the fixed end piece 141 is arranged around the first insertion hole H1 on the bottom 110. Furthermore, as will be described later, the fixed end piece 141 is arranged closer to the first insertion hole H1 than a protrusion 15 (described later) of the spring piece 142.

[0063] The free end piece 143 is formed, for example, in a flat plate shape. The free end piece 143 is inserted into a holding groove 1103 provided in the bottom 110 of the first housing 11. The free end piece 143 is held in the holding groove 1103 in a state in which it can move along the holding groove 1103. As will be described later, the free end piece 143 is disposed closer to the connection position M1 than a protrusion 15 (described later) of the spring piece 142.

[0064] The spring piece 142 is, for example, a plate-like member that connects the fixed end piece 141 and the free end piece 143. The spring piece 142 is formed in a convex curved shape (for example, a V-shape). The spring piece 142 protrudes outward from the center C1 of the bottom part 110 of the first housing 11. The vertex P1 of the spring piece 142 overlaps with the guide hole H3 in a plan view from the top-bottom direction.

[0065] The spring piece 142 has a protrusion 15. The protrusion 15 is a portion of the spring piece 142 that includes the apex P1 of the spring piece 142 and protrudes toward the inside of the guide hole H3. The protrusion 15 is disposed at a position on the first insertion hole H1 side of the connection position M1, a certain distance away from the connection position M1 (for example, a distance slightly shorter than the radius of the large diameter portion 212). By disposing the protrusion 15 in this manner, when the power supply terminal 21 is disposed at the connection position M1, the protrusion 15 elastically contacts the power supply terminal 21 from the first insertion hole H1 side (see FIG. 7). By contacting the protrusion 15 with the power supply terminal 21 in this manner, the power supply terminal 21 is prevented from easily returning from the connection position M1 toward the first insertion hole H1 side.

[0066] Furthermore, the fixed end piece 141 is positioned closer to the first insertion hole H1 than the protrusion 15, and the free end piece 143 is positioned closer to the connection position M1 than the protrusion 15. As a result, when the power supply terminal 21 moves over the protrusion 15 from the first insertion hole H1 side toward the connection position M1 side, the end piece of the spring part 14 on the side in the movement direction of the power supply terminal 21 is the free end piece 143, so the power supply terminal 21 can move forward by pressing down the protrusion 15 with a relatively small force. Therefore, in this case, the force (first force F1) required for the power supply terminal 21 to move from the first insertion hole H1 over the protrusion 15 to the connection position M1 is relatively small. On the other hand, when the power supply terminal 21 moves over the protrusion 15 from the connection position M1 side toward the first insertion hole H1 side, the end piece of the spring part 14 on the side in the movement direction of the power supply terminal 21 is the fixed end piece 141, so the power supply terminal 21 needs to press down on the protrusion 15 with a relatively large force to move forward compared to when the power supply terminal 21 moves over the protrusion 15 from the first insertion hole H1 side toward the connection position M1. Therefore, the force (second force F2) required for the power supply terminal 21 to move over the protrusion 15 from the connection position M1 toward the first insertion hole H1 is larger than the first force F1.

[0067] Here, "the fixed end piece 141 is positioned closer to the first insertion hole H1 than the protrusion 15" means that the fixed end piece 141 is positioned closer to the first insertion hole H1 than an imaginary line connecting the apex P1 of the protrusion 15 and the center C1 of the bottom 110. Similarly, "the free end piece 143 is positioned closer to the connection position M1 than the protrusion 15" means that the free end piece 143 is positioned closer to the connection position M1 than an imaginary line connecting the apex P1 of the protrusion 15 and the center C1 of the bottom 110.

[0068] The spring piece 142 is disposed in the bottom portion 110 between the second insertion hole H2 and the first insertion hole H1 and guide hole H3. This allows the spring piece 142 to be disposed in the space between the second insertion hole H2 and the first insertion hole H1 and guide hole H3. In this arrangement, the spring piece 142 is disposed on the outer periphery of the second insertion hole H2 so as not to overlap with the second insertion hole H2, and is bent so as to protrude outward from the outer periphery of the second insertion hole H2. Specifically, the spring piece 142 is bent in an inverted V-shape, with the apex of the V facing outward from the second insertion hole H2 and the opening of the V facing the second insertion hole H2. This prevents the spring piece 142 from interfering with (contacting) the protrusion 22 of the light source unit 2 inserted into the second insertion hole H2. In the above arrangement, the portion of the spring piece 142 other than the protrusion 15 is disposed closer to the center (toward the center C1) of the bottom 110 than the first insertion hole H1 and the corresponding guide hole H3. This allows the outer diameter of the bottom 110 (i.e., the outer diameter of the power feeding socket 1) to be smaller than when the spring piece 142 is disposed closer to the outer periphery of the first insertion hole H1 and the guide hole H3 in the bottom 110.

[0069] (2.2) Light source unit As shown in FIGS. 1 to 3, the light source unit 2 is detachably attached to the power feed socket 1. Commercial power is input to the power feed socket 1 from an external power source via a terminal block 7 (described later) and a pair of electric wires W1 that electrically connect the terminal block 7 to the power feed socket 1. The commercial power input to the power feed socket 1 is supplied to the light source unit 2 attached to the power feed socket 1.

[0070] The light source unit 2 has a main body 20, a pair of power supply terminals 21, a protrusion 22, a lens 23, and a light source (not shown).

[0071] The main body 20 is formed in a cylindrical shape from an insulating material such as synthetic resin.

[0072] An opening 201 is provided at one end (lower end) in the axial direction (vertical direction) of the main body 20. In the opening 201, a lens 23 is fitted.

[0073] The light source unit is housed inside the main body unit 20. The light source unit has, for example, a light-emitting element such as an LED (Light Emitting Diode), and a light-emitting circuit that receives power supplied from the power supply socket 1 and causes the light-emitting element to emit light.

[0074] Light emitted from the light source unit (light-emitting element) is emitted to the outside through lens 23. Here, lens 23 is arranged so that the optical axis of the light emitted from the light source unit through lens 23 coincides with the central axis of main body unit 20.

[0075] The main body 20 has an attachment portion 202 at the other end (upper end) opposite to the opening 201. The attachment portion 202 is one surface of the main body 20 opposite to the opening 201. The attachment portion 202 has a circular shape when viewed in a plan view from the top-bottom direction.

[0076] The mounting portion 202 is provided with a pair of through holes 203 that penetrate the mounting portion 202 in the thickness direction (vertical direction) of the mounting portion 202. The pair of through holes 203 are provided at positions that are point-symmetric with respect to the central axis of the main body 20. A corresponding one of a pair of power supply terminals 21 electrically connected to the light source unit is inserted into each of the pair of through holes 203. In other words, the pair of power supply terminals 21 are provided at positions that are point-symmetric with respect to the center of the mounting portion 202.

[0077] The pair of power supply terminals 21 are provided so as to protrude outward (upward) from the mounting portion 202. The pair of power supply terminals 21 are terminals that receive power from the power supply socket 1 to make the light source portion of the light source unit 2 emit light. The pair of power supply terminals 21 receive power from the power supply socket 1 when the light source unit 2 is attached to the power supply socket 1.

[0078] As shown in FIGS. 6 and 7, each of the pair of power supply terminals 21 has a small diameter portion 211 and a large diameter portion 212. The small diameter portion 211 is a cylindrical member formed to extend upward from the attachment portion 202. The large diameter portion 212 is a disk-shaped member formed at the tip of the small diameter portion 211. The diameter of the large diameter portion 212 is larger than the diameter of the small diameter portion 211. By inserting the large diameter portions 212 of the pair of power supply terminals 21 into a pair of first insertion holes H1 (see FIGS. 6 and 7) of the power supply socket 1, respectively, and rotating the light source unit 2 by a predetermined angle, the light source unit 2 is electrically and mechanically connected to the power supply socket 1.

[0079] The protrusion 22 protrudes outward (upward) from the mounting portion 202. The protrusion 22 is inserted into the second insertion hole H2 of the power supply socket 1. The protrusion 22 is formed in a cylindrical shape. The protrusion 22 is provided at a position where the central axis of the protrusion 22 coincides with the central axis of the main body 20. The protrusion 22 functions as an accommodation space that accommodates the electronic component E1 (see FIG. 9) that constitutes the above-mentioned light-emitting circuit. The electronic component E1 accommodated in the protrusion 22 is, for example, an electrolytic capacitor that constitutes the above-mentioned light-emitting circuit.

[0080] 6 and 7, the protrusion 22 has a pair of protrusions 24. The pair of protrusions 24 are aligned in the radial direction of the protrusion 22. More specifically, the pair of protrusions 24 protrude in opposite directions from the side surfaces of the protrusion 22 and are provided at positions that are point-symmetrical with respect to the center of the protrusion 22.

[0081] 6 and 7, the width of at least one of the pair of protrusions 24 narrows (becomes thinner) toward the tip. In this embodiment, the width of each of the pair of protrusions 24 narrows toward the tip. More specifically, the width of the protrusion 24 in the tangential direction of the peripheral edge of the protrusion 22 narrows toward the tip along the protruding direction of the protrusion 24.

[0082] Furthermore, the pair of protrusions 24 are provided at positions where a line segment connecting the centers of the pair of protrusions 24 and a line segment connecting the centers of the pair of power supply terminals 21 intersect at right angles. In this specification, "perpendicular" includes cases where the two are strictly perpendicular to each other, as well as cases where the angle between the two has an error of a few degrees (for example, less than 5 degrees) from 90°. This distributes the support points of the light source units 2 on the power supply socket 1 evenly, enabling the power supply socket 1 to hold the light source units 2 evenly.

[0083] 6 and 7, the protruding portion 22 has a plurality of (two in the illustrated example) adjustment holes 222. Each of the plurality of adjustment holes 222 penetrates the bottom portion 220 of the protruding portion 22 along the thickness direction (vertical direction) of the bottom portion 220. With the plurality of adjustment holes 222, even if a problem occurs in which gas is generated from an electrolytic capacitor serving as the electronic component E1, for example, the generated gas can be easily removed. Since the gas can be released to the outside through the plurality of adjustment holes 222, it is possible to adjust the internal pressure of the protruding portion 22. Furthermore, the gas released from the protruding portion 22 through the plurality of adjustment holes 222 is released to the outside through the through-hole 123 provided in the bottom portion 120 of the second housing 12. In other words, the protruding portion 22 has the adjustment holes 222 for adjusting the internal pressure of the protruding portion 22.

[0084] 9, when the light source unit 2 is attached to the power feed socket 1, a gap G2 is provided between a first surface S3 of the bottom 120 of the second housing 12 of the power feed socket 1 and one surface (upper surface) S5 of the bottom 220 of the protrusion 22 of the light source unit 2. This improves the attachability of the light source unit 2 to the power feed socket 1. That is, in the power feed socket 1 according to the embodiment, when the light source unit 2 is attached to the power feed socket 1, a gap G2 is provided between one surface S5 (surface) of the protrusion 22 that faces the lid 1201 and a first surface S3 (surface) of the lid 1201 that faces the protrusion 22.

[0085] (2.3) Cover member The cover member 6 is formed into a cylindrical shape and is made of a material with high thermal conductivity, such as aluminum. In this embodiment, the lighting device 100 is embedded in the ceiling so that the axial direction of the cover member 6 is aligned vertically.

[0086] As shown in Fig. 3, an opening 61 is provided at one end (lower end) in the axial direction (vertical direction) of the cover member 6. Also, as shown in Fig. 2, the cover member 6 has an attachment portion 62 at the other end (upper end) in the axial direction.

[0087] The cover member 6 accommodates the power feed socket 1 and the light source unit 2 attached to the power feed socket 1. Specifically, the power feed socket 1 and the light source unit 2 are inserted into the cover member 6 through the opening 61 from the power feed socket 1 side (bottom side).

[0088] The mounting portion 62 has a pair of through holes 621. Each of the pair of through holes 621 penetrates the mounting portion 62 along the thickness direction of the mounting portion 62.

[0089] When the power feed socket 1 and the light source unit 2 are housed inside the cover member 6, the bottom 120 of the second housing 12 of the power feed socket 1 comes into contact with the attachment portion 62 from below. At this time, a pair of guide portions 121 protruding from the second surface S4 of the bottom portion 120 are inserted into the pair of through holes 621, respectively. In other words, the pair of guide portions 121 are exposed upward through the pair of through holes 621.

[0090] (2.4) Mounting parts As shown in FIGS. 1 to 3, the mounting member 8 has a fixing portion 81 and a pair of gripping portions 82.

[0091] The fixing portion 81 is formed in a plate shape extending in the front-rear direction. In this embodiment, the lighting device 100 is embedded in the ceiling so that the fixing portion 81 is parallel to the horizontal plane. In this specification, "parallel" refers not only to the case where two elements are strictly parallel, but also to the case where the angle between the two elements is within a range of about several degrees (for example, less than 5 degrees).

[0092] A terminal block 7 is fixed to the underside of the rear end of the fixed portion 81. A cover member 6 accommodating the power supply socket 1 and the light source unit 2 is fixed to the underside of the front end of the fixed portion 81.

[0093] An upwardly recessed wiring portion 810 is formed at the front end of the fixed portion 81. The wiring portion 810 is formed in an elliptical shape with the longitudinal direction extending in the front-to-rear direction in a plan view from the top-to-bottom direction.

[0094] 3, a wiring space Sp2 is formed below the wiring portion 810. When the cover member 6 accommodating the power feed socket 1 and the light source unit 2 is fixed to the lower surface of the fixing portion 81, a pair of electric wires W1 extending from the terminal block 7 are wired in the wiring space Sp2. In this state, a pair of guide portions 121 exposed upward through a pair of through-holes 621 provided in the cover member 6 are also disposed in the wiring space Sp2.

[0095] The pair of gripping portions 82 are formed in the shape of plates extending downward from both ends in the left-right direction of the front end of the fixing portion 81. The pair of gripping portions 82 clamp the lower end portion of the cover member 6.

[0096] (3) Installation procedure for the light source unit (mounting procedure) First, the procedure for attaching the light source unit 2 to the power socket 1 will be described.

[0097] First, a worker (hereinafter referred to as the "worker") who intends to attach the light source unit 2 to the power supply socket 1 inserts a pair of power supply terminals 21 of the light source unit 2 upward into a pair of first insertion holes H1 of the power supply socket 1, as shown in Figure 6.

[0098] The pair of power supply terminals 21 are inserted upward into the pair of first insertion holes H1, and at the same time, the protrusion 22 of the light source unit 2 is inserted upward into the second insertion hole H2 of the power supply socket 1. At this time, the pair of protrusions 24 are inserted upward into the pair of grooves 113. Here, the width of each protrusion 24 becomes narrower (thinner) as it approaches the tip, which has the advantage that the pair of protrusions 24 can be easily inserted into the pair of grooves 113.

[0099] With the pair of power supply terminals 21, the protrusion 22, and the pair of protrusions 24 inserted into the pair of first insertion holes H1, the pair of second insertion holes H2, and the pair of grooves 113, respectively, the worker pushes the light source unit 2 upward until the attachment portion 202 of the light source unit 2 comes into contact with the bottom 110 of the power supply socket 1. With the attachment portion 202 and the bottom 110 in contact, each protrusion 24 is positioned above the restriction portion 114.

[0100] With the mounting portion 202 and the bottom portion 110 in contact with each other, the worker rotates the light source unit 2 relative to the power feed socket 1, with the vertical direction as the rotation axis. Specifically, the worker rotates the light source unit 2 relative to the power feed socket 1 clockwise when viewed from below (counterclockwise when viewed from above).

[0101] By rotating the light source unit 2 relative to the power socket 1, the pair of power supply terminals 21 move counterclockwise along the pair of guide holes H3 as viewed from above. At this time, the large diameter portion 212 of each power supply terminal 21 moves along the spring piece 142 of the spring portion 14. The worker rotates the light source unit 2 against the elastic force that the spring piece 142 applies to the large diameter portion 212.

[0102] Furthermore, by rotating the light source unit 2 relative to the power supply socket 1, the protrusion 22 moves counterclockwise as viewed from above. Accordingly, the pair of protrusions 24 protruding from the protrusion 22 enter the pair of gaps G1 (see FIG. 8) from the pair of grooves 113. Furthermore, the pair of protrusions 24 move counterclockwise as viewed from above while in contact with the pair of restricting portions 114 in the pair of gaps G1. Here, the pair of restricting portions 114 restrict the downward movement of the protrusion 22.

[0103] 7, the large diameter portion 212 moves over the protrusion 15 of the spring piece 142 and is clamped between the terminal contact piece 133 and the protrusion 15. This electrically connects the pair of power supply terminals 21 and the pair of conductive portions 13, completing the attachment of the light source unit 2 to the power supply socket 1.

[0104] (4) Light source unit removal procedure Next, a procedure for removing the light source unit 2 from the power socket 1 will be described.

[0105] When removing the light source unit 2 from the power feed socket 1, the above-described installation procedure is reversed. More specifically, the worker rotates the light source unit 2 relative to the power feed socket 1 in the opposite direction (counterclockwise when viewed from below) to the rotation direction (clockwise when viewed from below) during installation. At this time, the large diameter portion 212 of each power feed terminal 21 moves along the spring piece 142 of the spring portion 14. The worker rotates the light source unit 2 from the connection position M1 to the first insertion hole H1 against the elastic force applied to the large diameter portion 212 by the spring piece 142. Then, the worker pulls the pair of power feed terminals 21 and the protruding portion 22 of the light source unit 2 downward from the pair of first insertion hole H1 and second insertion hole H2 of the power feed socket 1. This completes the removal of the light source unit 2 from the power feed socket 1.

[0106] (5) Comparison of rotational force during installation and removal Next, the rotational operation force during installation (first torque T1) is compared with the rotational operation force during removal (second torque T2). The first torque T1 is the rotational operation force when an operator rotates the light source unit 2 relative to the power feed socket 1 when installing the light source unit 2 in the power feed socket 1. The second torque T2 is the rotational operation force when an operator rotates the light source unit 2 relative to the power feed socket 1 when removing the light source unit 2 from the power feed socket 1.

[0107] As described above, when attaching the light source unit 2 to the power socket 1, the worker inserts the pair of power supply terminals 21 and the protruding portion 22 of the light source unit 2 into the pair of first and second insertion holes H1 and H2 of the power socket 1, and then rotates the light source unit 2 clockwise as viewed from below. At this time, the pair of power supply terminals 21 each receive a first force F1 from the main body 20 of the light source unit 2. The first force F1 is a force that acts along the longitudinal direction of the guide hole H3 from the first insertion hole H1 toward the connection position M1. The first force F1 moves the pair of power supply terminals 21 from the first insertion hole H1 to the connection position M1, over the protruding portion 15. At this time, the first torque T1 is T1=2×f1×r1, where f1 is the magnitude of the first force F1, and r1 is the distance between the center of the power supply terminal 21 and the center C1 of the bottom portion 110.

[0108] Furthermore, when removing the light source unit 2 from the power feed socket 1, the worker inserts the pair of power feed terminals 21 and the protruding portion 22 of the light source unit 2 into the pair of first and second insertion holes H1 and H2 of the power feed socket 1, and then rotates the light source unit 2 counterclockwise as viewed from below. At this time, the pair of power feed terminals 21 each receive a second force F2 from the main body 20 of the light source unit 2. The second force F2 is a force that acts along the guide hole H3 from the connection position M1 toward the first insertion hole H1. The second force F2 moves the pair of power feed terminals 21 from the connection position M1, over the protruding portion 15, and to the first insertion hole H1. At this time, the second torque T2 is T2 = 2 × f2 × r1, where f2 is the magnitude of the second force F2, and r1 is the distance between the center of the power feed terminal 21 and the center C1 of the bottom portion 110.

[0109] In this embodiment, the fixed end piece 141 of the spring portion 14 is disposed closer to the first insertion hole H1 than the protrusion 15, and the free end piece 143 of the spring portion 14 is disposed closer to the connection position M1 than the protrusion 15. Therefore, as described above, the second force F2 is greater than the first force F1. That is, if the magnitude of the first force F1 is f1 and the magnitude of the second force F2 is f2, then f2 > f1. Therefore, the second torque T2 (= 2 × f2 × r1) is greater than the first torque T1 (= 2 × f1 × r1) (i.e., T2 > T1). As described above, in this embodiment, the light source unit 2 can be easily attached to the power feed socket 1 (i.e., with a relatively small force), and after attachment, the light source unit 2 can be prevented from easily coming off the power feed socket 1 due to, for example, vibration. Therefore, the electrical connection of the power feed terminal 21 to the conductive portion 13 can be improved.

[0110] (6) Effects The power feed socket 1 according to this embodiment includes a bottom 110 (base), a spring 14, and a conductive portion 13. The light source unit 2 is detachably attached to the bottom 110. The spring 14 is fixed to the bottom 110. The conductive portion 13 is electrically connected to a power feed terminal 21 included in the light source unit 2. The bottom 110 includes a first insertion hole H1 and a guide hole H3. The power feed terminal 21 is inserted into the first insertion hole H1. The guide hole H3 guides the power feed terminal 21 inserted into the first insertion hole H1 to a connection position M1 where the power feed terminal 21 is electrically connected to the conductive portion 13. The spring 14 includes a fixed end piece 141, a free end piece 143, and a spring piece 142. The fixed end piece 141 is fixed to the bottom 110. The free end piece 143 is movable relative to the bottom 110. The spring piece 142 connects the fixed end piece 141 and the free end piece 143. The spring piece 142 has a protrusion 15. The protrusion 15 elastically contacts the power supply terminal 21, which is positioned at the connection position M1, from the side of the first insertion hole H1. The fixed end piece 141 is positioned closer to the first insertion hole H1 than the protrusion 15. A force that moves the power supply terminal 21 from the first insertion hole H1 side toward the connection position M1 side so as to overcome the protrusion 15 is defined as a first force F1. A force that moves the power supply terminal 21 from the connection position M1 side toward the first insertion hole H1 side so as to overcome the protrusion 15 is defined as a second force F2. In this case, the second force F2 is greater than the first force F1.

[0111] With this configuration, the fixed end piece 141 is positioned closer to the first insertion hole H1 than the protrusion 15, and therefore the second force F2 can be made greater than the first force F1 with a simple structure. Furthermore, because the second force F2 is greater than the first force F1, the light source unit 2 can be easily attached to the power feed socket 1 (i.e., with a relatively small force), and after attachment, the light source unit 2 can be prevented from easily coming off the power feed socket 1 due to, for example, vibration, etc. Therefore, the electrical connection of the power feed terminal 21 to the conductive portion 13 can be improved.

[0112] Furthermore, in the power feed socket 1 according to this embodiment, the portion of the spring 14 other than the protrusion 15 is positioned closer to the center of the bottom 110 than the first insertion hole H1 and the guide hole H3. This configuration allows the outer diameter of the power feed socket 1 to be smaller than when the portion of the spring 14 other than the protrusion 15 is positioned closer to the outer periphery of the bottom 110 than the first insertion hole H1 and the guide hole H3. This allows the power feed socket 1 to be made smaller.

[0113] Furthermore, in the power feed socket 1 according to this embodiment, the bottom 110 further includes a second insertion hole H2. The protrusion 22 of the light source unit 2 is inserted into the second insertion hole H2. The spring piece 142 of the spring portion 14 is disposed on the outer periphery of the second insertion hole H2 and is bent so as to protrude toward the outer periphery of the second insertion hole H2. This configuration prevents the spring piece 142 from interfering with (contacting) the protrusion 22 inserted into the second insertion hole H2.

[0114] Moreover, the lighting device 100 according to this embodiment includes the power feed socket 1 and the light source unit 2. According to this configuration, the lighting device 100 having the above-described effects of the power feed socket 1 can be provided.

[0115] (7) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0116] (7.1) Variation 1 (7.1.1) Composition As shown in Fig. 10, Modification 1 has the same configuration as the above embodiment, except that the second inclination angle θ2 is larger than the first inclination angle θ1 in the protrusion 15 of the spring portion 14. Modification 1 will be described in detail below. In Modification 1, the same components as those in the above embodiment will be assigned the same reference numerals and their description will be omitted, and the description will focus on the parts that are different from the above embodiment.

[0117] As shown in Fig. 10, in the power feed socket 1 of the first modification, the protrusion 15 has a first inclined surface 15a and a second inclined surface 15b. The first inclined surface 15a is an inclined surface facing the first insertion hole H1. The second inclined surface 15b is an inclined surface facing the connection position M1. The second inclination angle θ2 of the second inclined surface 15b is larger than the first inclination angle θ1 of the first inclined surface 15a.

[0118] Here, the first inclination angle θ1 of the first inclined surface 15a is the angle of the first inclined surface 15a with respect to the inner circumferential surface H3a of the guide hole H3 in a plan view from the insertion direction of the power supply terminal 21 into the first insertion hole H1. More specifically, the first inclination angle θ1 of the first inclined surface 15a is an angle included in the area surrounded by the protrusion 15 and the guide hole H3 in the plan view, and is the angle between the tangent to the first inclined surface 15a at the intersection point N1 and the tangent to the inner circumferential surface H3a of the guide hole H3 at the intersection point N1. The intersection point N1 is the point where the first inclined surface 15a and the inner circumferential surface H3a intersect. Similarly, the second inclination angle θ2 of the second inclined surface 15b is the angle of the second inclined surface 15b with respect to the inner circumferential surface H3a of the guide hole H3 in the plan view. More specifically, the second inclination angle θ2 of the second inclined surface 15b is an angle included in the area surrounded by the protrusion 15 and the guide hole H3 in the plan view, and is the angle between a tangent to the second inclined surface 15b at the intersection N2 and a tangent to the inner circumferential surface H3a of the guide hole H3 at the intersection N2. The intersection N2 is the point where the second inclined surface 15b and the inner circumferential surface H3a intersect.

[0119] Since the second inclination angle θ2 of the second inclined surface 15b is greater than the first inclination angle θ1 of the first inclined surface 15a, the second force F2 (see FIG. 7) is even greater than the first force F1 (see FIG. 6). The first force F1 is a force for moving the power supply terminal 21 from the first insertion hole H1 side toward the connection position M1 side so as to overcome the protrusion 15. The second force F2 is a force for moving the power supply terminal 21 from the connection position M1 side toward the first insertion hole H1 side so as to overcome the protrusion 15. Therefore, in the first modification, the second torque T2 is even greater than the first torque T1 compared to the above embodiment. This further improves the electrical connection of the power supply terminal 21 to the conductive portion 13.

[0120] (7.1.2) Effect In the power feed socket 1 according to the first modification, the protrusion 15 has a first inclined surface 15a and a second inclined surface 15b. The first inclined surface 15a faces the first insertion hole H1. The second inclined surface 15b faces the connection position M1. The second inclination angle θ2 of the second inclined surface 15b relative to the inner circumferential surface H3a of the guide hole H3 is greater than the first inclination angle θ1 of the first inclined surface 15a relative to the inner circumferential surface H3a of the guide hole H3. This configuration allows the second torque T2 to be even greater than the first torque T1. This further improves the electrical connection of the power feed terminal 21 to the conductive portion 13.

[0121] In Modification 1, the second inclination angle θ2 is larger than the first inclination angle θ1, so that the second force F2 can be larger than the first force F1. Therefore, in Modification 1, in order to make the second force F2 larger than the first force F1, the fixed end piece 141 does not need to be disposed closer to the first insertion hole H1 than the protrusion 15, as in the above embodiment.

[0122] (7.2) Variation 2 (7.2.1) Composition 11, Modification 2 is configured similarly to the above embodiment, except that the friction coefficient of second inclined surface 15b of protrusion 15 of spring portion 14 is greater than the friction coefficient of first inclined surface 15a. Modification 2 will be described in detail below. In Modification 2, the same components as those in the above embodiment are denoted by the same reference numerals and their description will be omitted, and the description will focus on the parts that are different from the above embodiment.

[0123] As shown in FIG. 11 , in the power supply socket 1 of Modification 2, the protrusion 15 has a first inclined surface 15a and a second inclined surface 15b. The first inclined surface 15a is a inclined surface facing the first insertion hole H1. The second inclined surface 15b is a inclined surface facing the connection position M1. The friction coefficient of the second inclined surface 15b is greater than that of the first inclined surface 15a. For example, the second inclined surface 15b is rougher than the first inclined surface 15a. As a result, the second friction force generated at the contact surface between the second inclined surface 15b and the power supply terminal 21 is greater than the first friction force generated at the contact surface between the first inclined surface 15a and the power supply terminal 21. Therefore, in Modification 2, the second force F2 is even greater than the first force F1 compared to Embodiment 1. As a result, in Modification 2, the second torque T2 is even greater than the first torque T1 compared to Embodiment 1. Therefore, the electrical connection of the power supply terminal 21 to the conductive portion 13 can be further improved.

[0124] (7.2.2) Effect The power feed socket 1 according to the second modification includes a base 110, a spring portion 14, and a conductive portion 13. The light source unit 2 is detachably attached to the base 110. The spring portion 14 is fixed to the base 110. The conductive portion 13 is electrically connected to a power feed terminal 21 included in the light source unit 2. The base 110 includes a first insertion hole H1 and a guide hole H3. The power feed terminal 21 is inserted into the first insertion hole H1. The guide hole H3 guides the power feed terminal 21 inserted into the first insertion hole H1 to a connection position M1 where the power feed terminal 21 is electrically connected to the conductive portion 13. The spring portion 14 includes a fixed end piece 141, a free end piece 143, and a spring piece 142. The fixed end piece 141 is fixed to the base 110. The free end piece 143 is movable relative to the base 110. The spring piece 142 connects the fixed end piece 141 and the free end piece 143. The spring piece 142 has a protrusion 15. The protrusion 15 elastically contacts the power supply terminal 21 arranged at the connection position M1 from the side of the first insertion hole H1. The protrusion 15 has a first inclined surface 15a and a second inclined surface 15b. The first inclined surface 15a faces the first insertion hole H1. The second inclined surface 15b faces the connection position M1. The coefficient of friction of the second inclined surface 15b is greater than the coefficient of friction of the first inclined surface 15a.

[0125] According to this configuration, the force that moves the power supply terminal 21 from the first insertion hole H2 side toward the connection position M1 side so as to overcome the protrusion 15 is defined as a first force F1. The force that moves the power supply terminal 21 from the connection position M1 side toward the first insertion hole H1 side so as to overcome the protrusion 15 is defined as a second force F2. In this case, because the coefficient of friction of the second inclined surface 15a is greater than the coefficient of friction of the first inclined surface 15b, the second force F2 can be made greater than the first force F1. In other words, the second torque T2 can be made even greater than the first torque T1. This further improves the electrical connection of the power supply terminal 21 to the conductive portion 13.

[0126] In Modification 2, the second friction coefficient is greater than the first friction coefficient, so that the second force F2 can be greater than the first force F1. Therefore, in Modification 2, in order to make the second force F2 greater than the first force F1, the fixed end piece 141 does not need to be disposed closer to the first insertion hole H1 than the protrusion 15, as in the above embodiment.

[0127] (7.3) Variation 3 In the above embodiment, the spring portion 14 is made of metal. However, the spring portion 14 may be made of resin (for example, plastic). According to the third modification, the cost of the spring portion 14 can be reduced.

[0128] (7.4) Variation 4 In the fourth modification, the spring portion 14 is formed integrally with the conductive portion 13 in the above embodiment. That is, the power feeding socket 1 according to the fourth modification includes the spring portion 14 and the conductive portion 13. The conductive portion 13 is electrically connected to the power feeding terminal 21 disposed at the connection position M1. The spring portion 14 is formed integrally with the conductive portion 13. This configuration allows the number of parts to be reduced.

[0129] (7.5) Other Modifications In the above embodiment, the lighting device 100 is a downlight, but the lighting device 100 is not limited to a downlight and may be, for example, a spotlight.

[0130] In the above embodiment, the lid portion 1201 is provided on the second housing 12, but the lid portion may be provided on the first housing 11. In this case, the lid portion is formed, for example, at the tip (upper end) of the guide wall 112 of the first housing 11 so as to close the second insertion hole H2.

[0131] In the above embodiment, the adjustment hole 222 provided in the protrusion 22 is a gas vent hole for explosion prevention, but the adjustment hole 222 may be any hole that adjusts the internal pressure of the protrusion 22, and is not limited to a gas vent hole for explosion prevention.

[0132] In the above embodiment, the second housing 12 is cylindrical with the opening OP1 on one surface (lower surface), but the second housing may be, for example, flat (for example, disc-shaped).

[0133] In the above embodiment, the guide wall 112 (first side wall) of the first housing 11 and the inner side wall 124 (second side wall) of the second housing 12 overlap in the up-down direction (insertion direction). In contrast, the first side wall of the first housing 11 and the second side wall of the second housing 12 may overlap so as to be adjacent to each other in the insertion direction, for example.

[0134] In the above embodiment, the protrusion 15 protrudes into the guide hole H3. However, the protrusion 15 does not have to protrude into the guide hole H3 if the large diameter portion 212 of the power supply terminal 21 moves along the slopes on both sides of the protrusion 15 and moves over the protrusion 15 when the power supply terminal 21 moves through the guide hole H3.

[0135] (Aspect) The present specification discloses the following aspects.

[0136] The power feed socket (1) according to the first aspect includes a base (110), a spring (14), and a conductive portion (13). A light source unit (2) is detachably attached to the base (110). The spring (14) is fixed to the base (110). The conductive portion (13) is electrically connected to a power feed terminal (21) of the light source unit (2). The base (110) has a first insertion hole (H1) and a guide hole (H3). The power feed terminal (21) is inserted into the first insertion hole (H1). The guide hole (H3) guides the power feed terminal (21) inserted into the first insertion hole (H1) to a connection position (M1) where the power feed terminal (21) is electrically connected to the conductive portion (13). The spring portion (14) has a fixed end piece (141), a free end piece (143), and a spring piece (142). The fixed end piece (141) is fixed to the base (110). The free end piece (143) is movable relative to the base (110). The spring piece (142) connects the fixed end piece (141) and the free end piece (143). The spring piece (142) has a protrusion (15). The protrusion (15) elastically contacts the power supply terminal (21) located at the connection position (M1) from the side of the first insertion hole (H1). The fixed end piece (141) is located closer to the first insertion hole (H1) than the protrusion (15). The force that moves the power supply terminal (21) from the first insertion hole (H1) side toward the connection position (M1) side so as to overcome the protrusion (15) is defined as a first force (F1). The force that moves the power supply terminal (21) from the connection position (M1) side toward the first insertion hole (H1) side so as to overcome the protrusion (15) is defined as a second force (F2). In this case, the second force (F2) is greater than the first force (F1).

[0137] With this configuration, the fixed end piece 141 is disposed closer to the first insertion hole H1 than the protrusion 15, and therefore the second force F2 can be made greater than the first force F1 with a simple structure. Furthermore, since the second force F2 is greater than the first force F1, the electrical connection of the power supply terminal 21 to the conductive portion 13 can be improved.

[0138] The power feed socket (1) according to the second aspect includes a base (110), a spring (14), and a conductive portion (13). The light source unit (2) is detachably attached to the base (110). The spring (14) is fixed to the base (110). The conductive portion (13) is electrically connected to a power feed terminal (21) of the light source unit (2). The base (110) has a first insertion hole (H1) and a guide hole (H3). The power feed terminal (21) is inserted into the first insertion hole (H1). The guide hole (H3) guides the power feed terminal (21) inserted into the first insertion hole (H1) to a connection position (M1) where the power feed terminal (21) is electrically connected to the conductive portion (13). The spring portion (14) has a fixed end piece (141), a free end piece (143), and a spring piece (142). The fixed end piece (141) is fixed to the base portion (110). The free end piece (143) is movable relative to the base portion (110). The spring piece (142) connects the fixed end piece (141) and the free end piece (143). The spring piece (142) has a protrusion (15). The protrusion (15) elastically contacts the power supply terminal (21) arranged at the connection position (M1) from the side of the first insertion hole (H1). The protrusion (15) has a first inclined surface (15a) and a second inclined surface (15b). The first inclined surface (15a) faces the side of the first insertion hole (H1). The second inclined surface (15b) faces the connecting position (M1) and has a coefficient of friction greater than that of the first inclined surface (15a).

[0139] According to this configuration, if the force that moves the power supply terminal (21) from the first insertion hole (H2) side toward the connection position (M1) side so as to overcome the protrusion (15) is defined as a first force (F1), and the force that moves the power supply terminal (21) from the connection position (M1) side toward the first insertion hole (H1) side so as to overcome the protrusion (15) is defined as a second force (F2), the second force (F2) can be made larger than the first force (F1) because the coefficient of friction of the second inclined surface (15a) is larger than the coefficient of friction of the first inclined surface (15b).In this way, because the second force (F2) is larger than the first force (F1), the electrical connection of the power supply terminal (21) to the conductive portion (13) can be improved.

[0140] In the power supply socket (1) according to the third aspect, in the first or second aspect, the part of the spring portion (14) other than the protrusion (15) is positioned closer to the center of the base (110) than the first insertion hole (H1) and the guide hole (H3).

[0141] This configuration allows the outer diameter of the power feed socket 1 to be smaller than when the spring portion 14, excluding the protrusion 15, is disposed on the base portion 110 more radially outward than the first insertion hole H1 and the guide hole H3, thereby enabling the power feed socket 1 to be made more compact.

[0142] In the power feed socket (1) according to a fourth aspect, in any one of the first to third aspects, the base (110) further has a second insertion hole (H2). A protrusion (22) of the light source unit (2) is inserted into the second insertion hole (H2). The spring piece (142) of the spring portion (14) is disposed on the outer periphery of the second insertion hole (H2) and is bent so as to protrude toward the outer periphery of the second insertion hole (H2).

[0143] This configuration can prevent the spring piece (142) from interfering with (contacting) the protrusion (22) inserted into the second insertion hole (H2).

[0144] In a power feeding socket (1) according to a fifth aspect, in any one of the first to fourth aspects, the protrusion (15) has a first inclined surface (15a) and a second inclined surface (15b). The first inclined surface (15a) faces the first insertion hole (H1). The second inclined surface (15b) faces the connection position (M1). In a plan view from the insertion direction of the power feeding terminal (21) into the first insertion hole (H1), a second inclination angle (θ2) of the second inclined surface (15b) with respect to an inner circumferential surface (H3a) of the guide hole (H3) is larger than the first inclination angle (θ1) of the first inclined surface (15a) with respect to the inner circumferential surface (H3a) of the guide hole (H3).

[0145] According to this configuration, the second torque (T2) can be made even greater than the first torque (T1).

[0146] In the power feed socket (1) according to a sixth aspect, in any one of the first to fifth aspects, the spring portion (14) is made of resin.

[0147] This configuration reduces the cost of the spring portion (14).

[0148] In the power feeding socket (1) according to a seventh aspect, in any one of the first to sixth aspects, the spring portion (14) is formed integrally with the conductive portion (13).

[0149] This configuration allows the number of parts to be reduced.

[0150] An illumination device (100) according to an eighth aspect includes the power supply socket (1) according to any one of the first to seventh aspects and a light source unit (2).

[0151] This configuration makes it possible to provide a lighting device (100) that has the above-described effects of the power supply socket (1). [Explanation of symbols]

[0152] 1 power socket 2 Light source unit 13 Conductive part 14 Spring part 15 protrusion 15a First Slope 15b Second Slope 21 Power supply terminal 22 Protrusion 100 lighting equipment 110 Bottom (base) 141 Fixed end piece 142 Spring piece 143 Free end piece F1 First Force F2 Second Power H1 First insertion hole H2 Second insertion hole H3 guide hole M1 connection position θ1 1st inclination angle θ2 2nd inclination angle

Claims

1. a base to which the light source unit is detachably attached; a spring portion fixed to the base; a conductive portion electrically connected to a power supply terminal of the light source unit, The base portion is a first insertion hole into which the power supply terminal is inserted; a guide hole that guides the power supply terminal inserted into the first insertion hole to a connection position where the power supply terminal is electrically connected to the conductive portion, The spring portion is a fixed end piece fixed to the base; a free end piece movable relative to the base; a spring piece connecting the fixed end piece and the free end piece, The spring piece has a protrusion, the protrusion elastically contacts the power supply terminal disposed at the connection position from the side of the first insertion hole, the fixed end piece is disposed closer to the first insertion hole than the protrusion, a force that moves the power supply terminal from the first insertion hole side toward the connection position side so as to climb over the protrusion is defined as a first force, and a force that moves the power supply terminal from the connection position side toward the first insertion hole side so as to climb over the protrusion is defined as a second force, the second force being greater than the first force; Power supply socket.

2. a base to which the light source unit is detachably attached; a spring portion fixed to the base; a conductive portion electrically connected to a power supply terminal of the light source unit, The base portion is a first insertion hole into which the power supply terminal is inserted; a guide hole that guides the power supply terminal inserted into the first insertion hole to a connection position where the power supply terminal is electrically connected to the conductive portion, The spring portion is a fixed end piece fixed to the base; a free end piece movable relative to the base; a spring piece connecting the fixed end piece and the free end piece, The spring piece has a protrusion, the protrusion elastically contacts the power supply terminal disposed at the connection position from the side of the first insertion hole, The protrusion is a first inclined surface facing the first insertion hole; a second inclined surface facing the connection position, The coefficient of friction of the second slope is greater than the coefficient of friction of the first slope. Power supply socket.

3. a portion of the spring portion other than the protrusion is disposed closer to the center of the base than the first insertion hole and the guide hole; The power supply socket according to claim 1 or 2.

4. the base portion further includes a second insertion hole into which a protrusion of the light source unit is inserted, The spring piece of the spring portion is disposed on the outer circumferential side of the second insertion hole and is bent so as to protrude toward the outer circumferential side of the second insertion hole. The power supply socket according to claim 1 or 2.

5. The protrusion is a first inclined surface facing the first insertion hole; a second inclined surface facing the connection position, a second inclination angle of the second inclined surface with respect to the inner circumferential surface of the guide hole in a plan view from an insertion direction of the power supply terminal into the first insertion hole, the second inclined surface being larger than a first inclination angle of the first inclined surface with respect to the inner circumferential surface of the guide hole; The power supply socket according to claim 1 or 2.

6. The spring portion is made of resin. The power supply socket according to claim 1 or 2.

7. The spring portion is integrally formed with the conductive portion. The power supply socket according to claim 1 or 2.

8. The power supply socket according to claim 1 or 2; The light source unit, Lighting equipment.

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