JP2018120782A - Lamp and method for attaching to base in lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and improve workability in an attachment process.SOLUTION: A lamp includes: a base 10 having heat conductivity; a light source module 11 having a light-emitting element 21 configured to emit light and contact parts 20a, 20a, ... for power supply to the light-emitting element, and attached to the base; a control circuit plate 12 configured to control on/off of the light-emitting element, and having a terminal part 23; and a power supply attachment 24 pressing the light source module against the base, and attached to the base. In the power supply attachment, provided are a first power supply terminal 27 connected to the contact part, and a second power supply terminal 28 connected to the terminal part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technical field relating to a lamp having a power supply attachment that holds a light source module against a base on which the light source module is attached, and a method for attaching the lamp to the base.

JP 2013-45717 A

  In a lamp, for example, a vehicular lamp, a light source module having a light emitting element and a base such as a heat sink to which the light source module is attached are arranged inside a lamp outer casing constituted by a cover and a lamp housing. There is a type in which the emitted light is irradiated outward.

  In some lamps in which such a light source module is attached to a base, there is one in which the light source module is pressed by a power supply attachment attached to the base (see, for example, Patent Document 1).

  In the lamp described in Patent Document 1, a control circuit board for controlling turning on / off of the light emitting element is attached to the base, and the power supply socket is held in a state where the light emitting element is held by the power supply socket to which the cord is connected. It is held down by the power supply attachment. The power supply attachment is attached to the base, the light emitting element and the power supply socket function as a light source module, and the cord connected to the power supply socket is connected to the terminal portion of the control circuit board.

  The control circuit board is supplied with power from a power supply circuit (not shown), and the light emitting element is supplied with current from the control circuit board via a cord and a power supply socket. The light emitting element is controlled to be turned on and off by the control circuit board.

  By the way, in the above-described lamp, the light source module attached to the base is pressed by the power supply attachment, and the light source module is connected to the control circuit board attached to the base by a cord. Therefore, in addition to the base, the light source module, and the power supply attachment, a cord is required, the number of parts is large, a cord connection work is also required, and the number of work in the attachment process is also large.

  Therefore, an object of the lamp of the present invention and the method of mounting the lamp on the base is to overcome the above-mentioned problems, and to reduce the number of parts and improve the workability in the mounting process.

  First, a lamp according to the present invention includes a base having thermal conductivity, a light emitting module that emits light, and a light source module that is attached to the base and includes a contact portion for supplying power to the light emitting element. A control circuit board that controls turning on / off of the light emitting element and has a terminal portion, and a power supply attachment that holds the light source module against the base and is attached to the base, and the power supply attachment includes the contact portion. And a second power feeding terminal connected to the terminal portion.

  Thus, the first power supply terminal and the second power supply terminal of the power supply attachment are connected to the contact portion of the light source module and the terminal portion of the control circuit board, respectively.

  2ndly, in the lamp | ramp which concerns on above-described this invention, it is desirable to provide the light source attachment part to which the said light source module is attached to the said base, and the circuit attachment part to which the said control circuit board is attached.

  Thereby, since a control circuit board is attached to a base, the member for exclusive use for attaching a control circuit board is unnecessary.

  Thirdly, in the lamp according to the present invention described above, the circuit mounting portion is provided with a case portion having an opening at one end, the control circuit board is disposed inside the case portion, and the power supply attachment is the It is desirable to block at least a portion of the opening.

  Thereby, the control circuit board arrange | positioned inside a case part is covered with an electric power feeding attachment.

  Fourthly, in the lamp according to the present invention described above, a heat shielding wall is provided between the light source module and the control circuit board, and a part of the power supply attachment is abutted against the heat shielding wall. It is desirable that two power feeding terminals are connected to the terminal portion.

  Accordingly, the position of the second power supply terminal with respect to the terminal portion is determined by the heat shielding wall.

  Fifth, in the method of mounting the lamp on the base according to the present invention, a light source module having a light emitting element and a contact portion for feeding power to the light emitting element, and turning on / off the light emitting element to control the terminal portion. A control circuit board having a first attachment step in which the control circuit board is attached to a base having thermal conductivity, and a second attachment in which a power supply attachment having a first power supply terminal and a second power supply terminal is attached to the base. In the second mounting step, the first power feeding terminal is connected to the contact portion, and the second power feeding terminal is connected to the terminal portion.

  Thereby, in the second attachment step, the first power supply terminal and the second power supply terminal of the power supply attachment are connected to the contact portion of the light source module and the terminal portion of the control circuit board, respectively.

  According to the present invention, the first power supply terminal of the power supply attachment is connected to the contact part of the light source module and the second power supply terminal of the power supply attachment is connected to the terminal part of the control circuit board. And improvement in workability in the mounting process.

2 to 11 show an embodiment of the lamp of the present invention and a method for attaching the lamp to the base, and this figure is a cross-sectional view of the lamp. It is a disassembled perspective view which shows a part of lamp unit. It is sectional drawing which shows a part of lamp unit. It is a disassembled perspective view which shows a part of another lamp unit. It is sectional drawing which shows a part of another lamp unit. It is an expanded sectional view showing the example of the shape of the 2nd terminal for electric power feeding and a terminal part. It is an expanded sectional view showing another example of the shape of the 2nd terminal for electric power feeding, and a terminal part. It is an expanded sectional view showing another example of the shape of the 2nd terminal for electric power feeding, and a terminal part. It is a disassembled perspective view which shows a part of another lamp unit. It is sectional drawing which shows a part of another lamp unit. It is a perspective view which shows the example in which the radiation fin was provided in the circuit attachment part of the base.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the attachment method to the base in this invention lamp and a lamp is demonstrated with reference to an accompanying drawing.

  In the embodiment shown below, the lamp of the present invention is applied to a vehicular lamp, and the mounting method of the lamp of the present invention to the base is applied to the mounting method of the vehicular lamp to the base. The scope of application of the present invention is not limited to the vehicle lamp and the mounting method of the vehicle lamp on the base, but can be applied to various lamps that function as lighting and the mounting method of the lamp on the base. Can do.

  A lamp (vehicle lamp) 1 is attached to both left and right ends of the front end of the vehicle body.

  The lamp 1 includes, for example, a lamp housing 2 having an opening on the front and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and the inner space of the lamp outer casing 4 is formed as a lamp chamber 5.

  A lamp unit 6 is disposed in the lamp chamber 5. The lamp unit 6 includes a projection lens 7 that transmits light, a holder 8 that holds the projection lens 7, a reflector 9 that reflects light forward, a base 10 that emits heat, and a light source mounted on the base 10. It has the module 11 and the control circuit board 12 attached to the base 10 (refer FIG.2 and FIG.3).

  The projection lens 7 is formed in a substantially hemispherical shape convex forward. The holder 8 is formed in a cylindrical shape. A projection lens 7 is attached to the front end of the holder 8. The reflector 9 is disposed on the rear side of the holder 8.

  The base 10 is formed of, for example, a metal material having thermal conductivity, and at least a part functions as a heat sink. The base 10 includes a light source mounting portion 13 to which the light source module 11 is mounted, a circuit mounting portion 14 to which the control circuit board 12 is mounted, and a connecting portion 15 that connects the light source mounting portion 13 and the circuit mounting portion 14. Yes.

  The light source mounting portion 13 includes a flat mounting plate portion 13a facing in the vertical direction and fin portions 13b, 13b,... Protruding downward from the mounting plate portion 13a, and the fin portions 13b, 13b,. For example, it is located apart from the left and right.

  The circuit attachment portion 14 is positioned away from the light source attachment portion 13 in the left-right direction, and a portion excluding the lower end portion is provided as the case portion 16. The case portion 16 is formed in a box shape having an opening 16 a at the upper end, and has a rectangular bottom surface portion 17 that faces in the vertical direction and a peripheral surface portion 18 that continues to the outer periphery of the bottom surface portion 17. A surface portion of the peripheral surface portion 18 that is positioned farthest from the light source mounting portion 13 in the left-right direction is provided as the mounting surface portion 18a. The upper surface of the case portion 16 and the upper surface of the mounting plate portion 13a are located at substantially the same height.

  A holding projection 19 that protrudes upward from the bottom surface portion 17 is provided inside the case portion 16, and the holding projection 19 is spaced apart from the left and right in a state of being parallel to the mounting surface 18 a.

  The connection part 15 has the connection wall 15a which faces an up-down direction, and the heat shielding wall 15b protruded upward from the intermediate part in the left-right direction of the connection wall 15a. The connecting wall 15 a connects the light source mounting portion 13 and the lower end portion of the circuit mounting portion 14. The upper surface of the heat shielding wall 15 b exists at a position lower than the upper surface of the peripheral surface portion 18.

  The light source module 11 includes a substrate 20 and a light emitting element 21 mounted on the substrate 20. A plurality of contact portions 20 a, 20 a,... For feeding power to the light emitting element 21 are formed on the upper surface of the substrate 20. A power supply path (not shown) for connecting the light emitting element 21 and the contact portions 20a, 20a,. In the light source module 11, the substrate 20 is attached to the arrangement surface portion 13 a of the light source attachment portion 13.

  The control circuit board 12 has a function of controlling turning on and off of the light emitting element 21, and includes a control board 22 having a control circuit and a terminal portion 23 connected to one end of the control board 22 and functioning as a connector. The control circuit board 12 is electrically connected to a power supply circuit (not shown) by a cable or the like. The control circuit board 12 has a maximum area in the control board 22 and is attached to the circuit attachment portion 14 with the first surface 22a and the second surface 22b facing the opposite sides facing in the left-right direction. The terminal portion 23 has a connection hole 23a that protrudes laterally from the first surface 22a and opens upward.

  In the control circuit board 12, a part of the control board 22 is inserted between the mounting surface portion 18 a of the circuit mounting portion 14 and the holding projection 19, and the lower surface of the control board 22 is abutted against the bottom surface portion 17. It is attached to the circuit attachment part 14 in the state arrange | positioned in (3). In the state where the control circuit board 12 is attached to the circuit attachment part 14, the second surface 22b of the control board 22 is brought into contact with the inner surface of the attachment surface part 18a, and the terminal part 23 is positioned on the upper side.

  The light source module 11 attached to the light source attachment portion 13 is pressed to the arrangement surface portion 13 a side by the power supply attachment 24. The power supply attachment 24 includes a base surface portion 25 formed in a horizontally long rectangular shape facing in the up-down direction and a protruding portion 26 protruding downward from a substantially central portion in the left-right direction of the base surface portion 25.

  The base surface portion 25 is formed with a rectangular opening 25a penetrating vertically. The first power supply terminals 27, 27,... Projecting from the left opening edge and the right opening edge of the opening 25 a so as to approach each other are positioned. The first power supply terminals 27, 27,... The first power supply terminal 27 is elastically deformable in a substantially vertical direction.

  The power supply attachment 24 is provided with a second power supply terminal 28 that protrudes downward from the lower surface of the base surface portion 25 and functions as a connector. The first power supply terminal 27 and the second power supply terminal 28 are located on the opposite sides of the protruding portion 26 in the left-right direction, and are connected by a conductive portion (not shown) embedded in the base surface portion 25.

  The power supply attachment 24 is attached to the base 10 from above. When the power supply attachment 24 is attached to the base 10, the protruding portion 26 is abutted against the heat shielding wall 15 b of the connecting portion 15 from above, and positioning in the vertical direction with respect to the base 10 is performed. At this time, the power feeding attachment 24 is connected in a state where the first power feeding terminals 27, 27,... Are elastically deformed to the contact portions 20a, 20a,. The terminal 28 is inserted into the connection hole 23 a of the terminal portion 23 in the control circuit board 12 and connected. The embodiment of the terminal portion 23 and the second power supply terminal 28 is not limited to this form. For example, a connector in which the connection structure of the terminal portion 23 and the second power supply terminal 28 can be fitted to each other. It may be a form.

  Further, in a state where the second power feeding terminal 28 is connected to the terminal portion 23, the lower surface of the control plate 22 in the control circuit board 12 is abutted against the bottom surface portion 17, thereby causing the terminal portion 23 to move up and down with respect to the base 10. Since the positioning in the direction is performed, the second power feeding terminal 28 is inserted into the connection hole 23a of the terminal portion 23 to a certain position, and the insertion failure of the second power feeding terminal 28 into the terminal portion 23 occurs. Therefore, it is possible to ensure a good connection state with respect to the terminal portion 23 of the second power feeding terminal 28.

  In a state where the power supply attachment 24 is attached to the base 10, the opening 16 a of the case portion 16 is blocked by the base surface portion 25 of the power supply attachment 24.

  The power supply attachment 24 has a base surface portion 25 attached to the base 10 by, for example, screwing. At this time, a conductive portion for grounding (earth) is formed at the opening edge of the screw insertion hole formed in the base surface portion 25, so that the power supply attachment 24 is attached to the base surface portion 25 by the mounting screw and the base 10. Grounding is performed, and grounding can be performed with a simple configuration.

  In the lamp 1 configured as described above, when light is emitted from the light emitting element 21, the emitted light is reflected by the reflector 9 and incident on the projection lens 7, and is converted into parallel light by the projection lens 7. 3 is transmitted and irradiated forward.

  When light is emitted from the light emitting element 21, the control circuit board 12 is in a driving state, and heat is generated in the light source module 11 and the control circuit board 12. The heat generated in the light source module 11 is transmitted to the light source mounting portion 13 of the base 10 and is mainly emitted from the fin portions 13b, 13b,..., And a good driving state of the light source module 11 is ensured. On the other hand, the heat generated in the control circuit board 12 is transmitted to the circuit mounting portion 14 of the base 10 and released, so that a good driving state of the control circuit board 12 is ensured.

  Since heat is easily transmitted upward, as described above, the connecting wall 15a is configured to connect the light source mounting portion 13 and the lower end portion of the circuit mounting portion 14 so that the light source mounting portion 13 and the circuit mounting portion are connected. Therefore, it is possible to ensure good driving performance between the light source module 11 attached to the light source attachment portion 13 and the control circuit board 12 attached to the circuit attachment portion 14.

  Moreover, since the heat shielding wall 15b is positioned between the light source mounting portion 13 and the circuit mounting portion 14, the heat shielding wall 15b further suppresses heat transferability between the light source mounting portion 13 and the circuit mounting portion 14. Thus, it becomes possible to ensure better driving performance of the light source module 11 and the control circuit board 12.

  The connecting portion 15 may be formed of a material having low heat transfer properties such as a resin material. By forming the connecting portion 15 with a material having low heat transfer properties, it becomes possible to ensure better driving performance of the light source module 11 and the control circuit board 12.

  As described above, in the lamp 1, the light source module 11 is attached to the base 10, and the power supply attachment 24 is attached to the base 10 in a state where the light source module 11 is attached to the base 10. The terminal 27 and the second power feeding terminal 28 are respectively connected to predetermined parts. That is, the light source module 11 having the light emitting element 21 and the contact portions 20a, 20a,... For supplying power to the light emitting element 21, and the control circuit board 22 that controls turning on and off the light emitting element 21 and has the terminal portion 23. A first attachment step of attaching to the base 10 having thermal conductivity, and a second attachment of attaching the power supply attachment 24 having the first power supply terminal 27 and the second power supply terminal 28 to the base 10. In the second mounting step, the first power supply terminal 27 is connected to the contact portions 20a, 20a,... And the second power supply terminal 28 is connected to the terminal portion.

  As described above, in the lamp 1, the power feeding attachment 24 is controlled with the first power feeding terminals 27, 27,... Connected to the contact portions 20 a, 20 a,. A second power feeding terminal 28 connected to the terminal portion 23 of the circuit board 12 is provided.

  Therefore, the first power supply terminals 27, 27,... And the second power supply terminal 28 of the power supply attachment 24 are respectively connected to the contact portions 20a, 20a,. Therefore, it is not necessary to connect the power supply attachment 24 to the control circuit board 12 attached to the base 10 with a cord, and the number of parts can be reduced and the workability in the attachment process can be improved.

  In the second mounting step, which is one mounting step, the first power feeding terminals 27, 27,... Of the power feeding attachment 24 and the second power feeding terminal 28 are respectively connected to the contact portions 20a of the light source module 11. 20a, and the terminal part 23 of the control circuit board 12 are connected.

  Therefore, it is not necessary to connect the power supply attachment 24 to the control circuit board 12 attached to the base 10 with a cord, and the number of parts can be reduced and the workability in the attachment process can be improved.

  Further, the control circuit board 12 may generate noise during driving, but noise is generated because the opening 16a of the case part 16 is covered by the power supply attachment 24 in a state where the control circuit board 12 is arranged in the case part 16. It is possible to suppress.

  Thus, since the power supply attachment 24 also functions as a lid portion that closes the control circuit board 12 disposed inside the case portion 16, there is no need for a dedicated lid for closing the control circuit board 12. The manufacturing cost of the lamp 1 can be reduced by reducing the number of parts.

  Furthermore, a light source attachment part 13 to which the light source module 11 is attached to the base 10 and a circuit attachment part 14 to which the control circuit board 12 is attached are provided.

  Accordingly, since the control circuit board 12 is attached to the base 10, a dedicated member for attaching the control circuit board 12 is not necessary, the number of parts can be reduced, and the second in a state where the light source module 11 is pressed. A good connection state of the power supply terminal 28 to the control circuit board 12 can be ensured.

  Further, the case portion 16 having the opening 16 a is provided in the circuit attachment portion 14, the control circuit board 12 is disposed inside the circuit attachment portion 14, and the power supply attachment 24 is in a state of closing the opening 16 a of the case portion 16. .

  Accordingly, since the control circuit board 12 disposed inside the case portion 16 is covered by the power supply attachment 24, interference due to noise of the control circuit board 12 with respect to the light source module 11 when the control circuit board 12 is driven can be suppressed. .

  Further, a heat shielding wall 15b is provided between the light source module 11 and the control circuit board 12, and the second power feeding terminal 28 is connected to the terminal portion 23 in a state where a part of the power feeding attachment 24 is abutted against the heat shielding wall 15b. Connected to.

  Accordingly, since the second power supply terminal 28 is connected to the terminal portion 23 in a state where the power supply attachment 24 is in contact with the heat shield wall 15b, the position of the second power supply terminal 28 with respect to the terminal portion 23 is the heat shield wall 15b. Therefore, it is possible to ensure a good connection state with respect to the terminal portion 23 of the second power supply terminal 28.

  In addition, by providing a heat shielding wall 15b between the light source module 11 and the control circuit board 12, it is possible to suppress mutual interference due to noise between the light source module 11 and the control circuit board 12 when the control circuit board 12 is driven. Is possible.

  Although the example of the 2nd terminal 28 for electric power feeding inserted in the terminal part 23 and the above and the example of the control circuit board 12 which has the terminal part 23 were shown above, the 2nd terminal for electric power feeding and a control circuit board were shown. May be configured as follows (see FIGS. 4 and 5).

  For example, the power supply attachment 24 may be provided with second power supply terminals 28A, 28A,. The power supply attachment 24 is provided with a terminal protrusion 25a protruding downward from the base surface portion 25, and the second power supply terminals 28A, 28A,... . The second power feeding terminals 28A, 28A,... Are spaced apart from each other in the front-rear direction, and are elastically deformable in a substantially vertical direction.

  Instead of the terminal portion 23, terminal portions 23A, 23A,... Are formed on the control circuit board 12A. The terminal portions 23A, 23A, ... are formed on a part (upper surface) of the outer peripheral surface of the control circuit board 12A, and are formed as a part of the circuit pattern formed on the control circuit board 12A. The terminal portions 23A, 23A,... Are formed in a concave shape and are spaced apart in the front-rear direction.

  The power supply attachment 24 is attached to the base 10 from above. The first power feeding terminals 27, 27,... Are connected to the contact portions 20a, 20a,. The terminals 28A, 28A,... Are connected to the terminal portions 23A, 23A,.

  When the terminal portion 23A is formed in a curved shape, it is desirable that the outer surface on the contact side (lower surface side) of the second power supply terminal 28A is also formed in a convex curved surface (see FIG. 6). By forming the contact-side outer surface of the second power supply terminal 28A in such a shape, the curved portion of the terminal portion 23A and the curved portion of the second power supply terminal 28A are in contact with each other. The part 23A is hardly damaged or peeled off, and a good connection state between the terminal part 23A and the second power feeding terminal 28A can be ensured.

  In this case, when the terminal portion 23A and the end portion on the contact side of the second power supply terminal 28A are hemispherical, the radius R2 of the second power supply terminal 28A is greater than the radius R1 of the terminal portion 23A. By reducing the value, it is possible to ensure a good connection state between the terminal portion 23A and the second power feeding terminal 28A.

  Further, as shown in FIG. 7, when the width of the second power supply terminal 28A is large and the second power supply terminal 28A is in contact with the terminal portion 23A at two locations, the contact portions 28a and 28a are curved. It is desirable to prevent the terminal portion 23A from being scratched or peeled off by plating.

  Furthermore, as shown in FIG. 8, it is also possible to form a flat surface portion 23a in the terminal portion 23A and make the second power supply terminal 28A contact the flat surface portion 23a without contacting the curved surface portions 23b and 23b. It is. When the second power feeding terminal 28A is in contact with the flat surface portion 23a, the second power feeding terminal 28A is brought into contact with the terminal portion 23A with a stable pressure to prevent the terminal portion 23A from being scratched or stripped of plating. In addition, a stable connection state of the second power feeding terminal 28A to the terminal portion 23A can be ensured.

  For example, the power supply attachment 24 may be provided with second power supply terminals 28B, 28B,... That can be elastically deformed (see FIGS. 9 and 10). The power supply attachment 24 is provided with a terminal protrusion 25a that protrudes downward from the base surface 25, and second power supply terminals 28B, 28B,... Protrude downward from the terminal protrusion 25a. The second power supply terminals 28B, 28B,... Are spaced apart from each other in the front-rear direction, and are elastically deformable in a substantially left-right direction.

  Instead of the terminal portion 23, terminal portions 23B, 23B,... Are formed on the control circuit board 12B. The terminal portions 23B, 23B,... Are formed at the upper end portion of the first surface 22a of the control circuit board 12B, and are formed as part of the circuit pattern formed on the control circuit board 12B.

  The power supply attachment 24 is attached to the base 10 from above. The first power feeding terminals 27, 27,... Are connected to the contact portions 20a, 20a,. The terminals 28B, 28B, ... are connected to the terminal portions 23B, 23B, ... of the control circuit board 12B while being elastically deformed from the side.

  Note that the terminal portion 23B and the second power supply terminal 28B also have a curved shape or a shape having a flat portion, like the terminal portion 23A and the second power supply terminal 28A shown in FIGS. It may be formed.

  Moreover, the connection from the side to the terminal portions 23B, 23B,... Of the second power supply terminals 28B, 28B,... Is the first surface 22a or the second surface 22b of the control circuit board 12B. It may be carried out from any of these aspects.

  In addition, in order to improve the performance of releasing heat generated when the control circuit board 12 (12A, 12B) is driven in the circuit mounting portion 14 of the base 10, radiating fins 29 protruding outward from the peripheral surface portion 18, 29,... May be provided (see FIG. 11).

  DESCRIPTION OF SYMBOLS 1 ... Lamp, 10 ... Base, 11 ... Light source module, 12 ... Control circuit board, 13 ... Light source attachment part, 14 ... Circuit attachment part, 15b ... Heat shielding wall, 16 ... Case part, 16a ... Opening, contact part ... 20a, 20a,..., 21 ... light emitting element, 23 ... terminal portion, 24 ... feeding attachment, 27 ... first feeding terminal, 28 ... second feeding terminal, 12A ... control circuit board, 23A ... terminal Part, 28A ... second power supply terminal, 12B ... control circuit board, 23B ... terminal part, 28B ... second power supply terminal

Claims (5)

A base having thermal conductivity;
A light source module that has a light emitting element that emits light and a contact portion for feeding power to the light emitting element, and is attached to the base;
A control circuit board for controlling turning on and off the light emitting element and having a terminal portion;
A power supply attachment that holds the light source module against the base and is attached to the base;
The power supply attachment is provided with a first power supply terminal connected to the contact portion and a second power supply terminal connected to the terminal portion. The lamp according to claim 1, wherein a light source attachment portion to which the light source module is attached and a circuit attachment portion to which the control circuit board is attached are provided on the base. The circuit mounting portion is provided with a case portion having an opening at one end,
The control circuit board is disposed inside the case portion;
The lamp according to claim 2, wherein the power supply attachment closes at least a part of the opening. A heat shielding wall is provided between the light source module and the control circuit board;
The lamp according to claim 1, 2 or 3, wherein the second power supply terminal is connected to the terminal portion in a state where a part of the power supply attachment is abutted against the heat shielding wall. A light source module having a light emitting element and a contact portion for supplying power to the light emitting element, and a control circuit board having a terminal portion for controlling turning on and off the light emitting element are attached to a base having heat conductivity. Mounting process,
A second attachment step in which a power supply attachment having a first power supply terminal and a second power supply terminal is attached to the base;
In the second mounting step, the first power feeding terminal is connected to the contact portion, and the second power feeding terminal is connected to the terminal portion.

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