LED lamp

Abstract

To provide an LED illuminating device with a light blocking hood that comprises a small number of components.SOLUTION: An LED lamp 1 can be attached to and detached from a socket 101, and comprises a light source part 20, a circuit 30, and a lens 50 for controlling light emitted from the light source part 20. In addition, the LED lamp 1 comprises: a bottomed cylindrical outer cover 10; a base pin 15 protruding from the outer cover 10, and electrically connected to the circuit 30; and a cylindrical light blocking hood 70 including a light blocking part 71 extending from an opening part of the outer cover 10, and an insertion part 72 inserted into a cylinder of the outer cover 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an LED lamp, and particularly to an LED lamp with a built-in power supply circuit.

Background Art

[0002] Conventionally, when attaching a light-shielding hood to a lighting device using an LED, a configuration has been proposed in which an LED lamp and a fixture covering the LED lamp are used, and the light-shielding hood is attached to the fixture. For example, Patent Document 1 discloses a configuration in which a light-shielding hood is attached to a fixture incorporating an LED lamp.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a configuration using an LED lamp and a fixture and attaching a light-shielding hood to the fixture, the number of parts increases, which further leads to an increase in the size of the lighting device and a decrease in assemblability. In an LED lighting device with a light-shielding hood, it is desirable to adopt a configuration that enables miniaturization of the device with a small number of parts.

Means for Solving the Problems

[0005] The LED lamp according to the present disclosure is detachable from a socket, and includes a light source unit including an LED element, a circuit for supplying power to the light source unit, a lens for controlling light emitted from the light source unit, a bottomed cylindrical outer cover for housing the light source unit, the circuit, and the lens, a base pin protruding from the outer cover and electrically connected to the circuit, a light-shielding portion extending from an opening of the outer cover, and a cylindrical light-shielding hood including an insertion portion inserted into the cylinder of the outer cover.

Advantages of the Invention

[0006] According to the LED lamp according to the present disclosure, it is possible to provide an LED lighting device with a light-shielding hood having a small number of parts.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

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Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0008] Hereinafter, with reference to the drawings, an example of an embodiment of an LED lamp according to the present disclosure will be described in detail. Note that forms formed by selectively combining the components of the plurality of embodiments and modification examples described below are included in the scope of the present disclosure. In the description of the embodiment, for convenience of explanation, the direction from the base pin side toward the lens side along the side surface of the outer cover is defined as the axial direction. In addition, the side where the lens is located with respect to the base pin is defined as the upper side.

[0009] FIG. 1 is a perspective view of an LED lamp 1 which is an example of an embodiment, and shows a state in which the LED lamp 1 is attached to a connection device 100 including a socket 101. As shown in FIG. 1, the LED lamp 1 and the connection device 100 together constitute a spotlight. A spotlight is generally a lighting device that intensively illuminates the direction in which the lamp is directed. In the example shown in FIG. 1, the connection device 100 constituting the spotlight is attached to a wiring duct rail 104. Note that the LED lamp 1 may be attached to a socket for a spotlight provided on, for example, the ceiling or wall of a building.

[0010] The connection device 100 includes a socket 101, a plug 102 attached to the wiring duct rail 104, and a shaft 103 that connects the socket 101 and the plug 102, and has a structure in which the shaft 103 extends from the central portion in the radial direction of the columnar plug 102. The socket 101 is formed in a columnar shape similar to the plug 102, but since a part of the LED lamp 1 is inserted into the socket 101, its diameter is larger than that of the plug 102. Although details will be described later, by inserting a part of the LED lamp 1 into the socket 101, the outer peripheral surfaces of the LED lamp 1 and the socket 101 can be flush, improving the design of the light.

[0011] The connecting device 100 has a pivoting mechanism in which the socket 101 rotates at a predetermined angle with respect to the shaft 103. The pivoting mechanism may have a structure in which the socket 101 rotates at a predetermined angle with the tip of the shaft 103 as the rotation axis, or may have a structure in which the socket 101 is rotatable around the shaft. Also, the shaft 103 may be rotatable with respect to the plug 102. With the pivoting mechanism of the connecting device 100, the LED lamp 1 can be directed toward a place where light is to be irradiated while the connecting device 100 is attached to the wiring duct rail 104.

[0012] The LED lamp 1 includes a bottomed cylindrical outer cover 10 and a light-shielding hood 70 inserted into the cylinder of the outer cover 10. Although details will be described later, in this embodiment, the light-shielding hood 70 is detachable from the lens 50. Also, the LED lamp 1 is detachable from the socket 101. The LED lamp 1 includes base pins 15 (see FIG. 3 and the like described later) protruding from the outer cover 10, and is attached to the socket 101 by inserting the base pins 15 into the pin insertion portion of the socket 101, and the LED lamp 1 and the socket 101 are electrically connected.

[0013] The LED lamp 1 has a structure in which a light source unit 20 (see FIG. 3 and the like described later), a lens 50, etc. are accommodated in the cylinder of the outer cover 10. The outer cover 10 forms the appearance of the LED lamp 1 and functions as a housing for accommodating the light source unit 20, the lens 50, etc. In the form illustrated in FIG. 1, the outer cover 10 of the LED lamp 1 constitutes the outer cover of a spotlight. In other words, the outer cover 10 forms the appearance of a spotlight. Note that a conventionally known spotlight has a structure in which an LED lamp is accommodated in the cylinder of a bottomed cylindrical cover, and the outer cover of the LED lamp does not form the appearance of the spotlight.

[0014] According to the LED lamp 1, since the outer cover 10 forms the appearance of the spotlight, a cover for covering the lamp is not required, and a significant reduction in the diameter of the spotlight can be achieved. Also, the attachment and detachment of the LED lamp 1 to and from the socket 101 is easy. For example, there is no need to put a hand into the cylinder of the cover to replace the lamp or disassemble the lighting device to replace the lamp. The outer cover 10 and the light-shielding hood 70 are formed in a cylindrical shape having a constant outer diameter for the portions appearing in the appearance of the spotlight. And the outer cover 10, the light-shielding hood 70, and the socket 101 have substantially the same outer diameter, and their outer peripheral surfaces are flush. The spotlight using the LED lamp 1 has a stylish design with a sense of unity as a whole.

[0015] As described above, the LED lamp 1 includes a lens 50 that controls the light emitted from the light source unit 20. The lens 50 has a light-emitting surface 52 that is circular in plan view. In this specification, the plan view means the case of viewing from a direction perpendicular to the light-emitting surface 52 of the lens 50 unless otherwise specified. On the light-emitting surface 52, a protrusion 53 for lamp attachment and detachment is formed. When removing the LED lamp 1 from the socket 101, the LED lamp 1 can be rotated with respect to the socket 101 by applying a rotational load to the lens 50 using this protrusion 53, and the LED lamp 1 can be removed. Also, when attaching the LED lamp 1 to the socket 101, it can be attached to the socket 101 by rotating the LED lamp 1 in the direction opposite to the removal direction using the protrusion 53.

[0016] In the case of the spotlight illustrated in FIG. 1, since the socket 101 of the connection fixture 100 is exposed without being embedded in the ceiling, wall, etc., when attaching and detaching the LED lamp 1 to and from the socket 101, the outer cover 10 of the LED lamp 1 can be gripped to rotate the lamp.

[0017] FIG. 2 is a perspective view of the LED lamp 1, showing a state in which the light-shielding hood 70 is removed. As shown in FIG. 2, the light-shielding hood 70 is configured to be detachable. The light-shielding hood 70 includes a light-shielding portion 71 extending from the opening of the outer cover 10 and an insertion portion 72 inserted into the cylinder of the outer cover 10. Although details will be described later, the light-shielding hood 70 is mounted on the lens 50 inside the cylinder of the outer cover 10. That is, the light-shielding hood 70 is detachably attached to the lens 50. Engagement protrusions 73a and 73b that engage with the light-shielding hood fixing portions 60a and 60b (see FIGS. 5 and the like described later) of the lens 50 are formed on the insertion portion 72 of the light-shielding hood 70.

[0018] The light-shielding hood 70 is generally applied to a spotlight and has a function of covering the periphery of the opening of the outer cover 10 and blocking light that spreads to areas other than the intended irradiation target. The light-shielding hood 70 may be a metal member or a resin member. The light-shielding hood 70 is, for example, made of the same material as the outer cover 10 and has the same color as the outer cover 10.

[0019] The light-shielding portion 71 extends axially from the opening of the outer cover 10 to block unnecessary light. The light-shielding portion 71 is formed in a cylindrical shape having the same outer diameter as the outer cover 10, and the outer peripheral surface of the light-shielding portion 71 is flush with the outer peripheral surface of the outer cover 10. The axial length of the light-shielding portion 71 is not particularly limited and is appropriately set according to the size of the LED lamp 1 and the like. An example of the axial length of the light-shielding portion 71 is 10 mm or more and 40 mm or less. The axial length of the light-shielding portion 71 may be shorter than the axial length of the insertion portion 72, but in this embodiment, it is longer than the axial length of the insertion portion 72.

[0020] The insertion part 72 is formed in a cylindrical shape similar to the light-shielding part 71, but its outer diameter is smaller than that of the light-shielding part 71. Therefore, a step is formed on the outer peripheral surface of the light-shielding hood 70. Since the insertion part 72 is the part inserted into the cylinder of the outer cover 10, the outer diameter of the insertion part 72 is smaller than the inner diameter of the outer cover 10. However, it is preferable that the outer diameter of the insertion part 72 is close to the inner diameter of the outer cover 10 within a range that does not hinder the insertion into the outer cover 10. The inner diameter of the light-shielding hood 70 is constant, for example, over the entire axial length, and the insertion part 72 is formed thinner than the light-shielding part 71.

[0021] Most of the insertion part 72, for example, 90% or more, or 95% or more of the axial length of the insertion part 72, is inserted into the outer cover 10. However, to ensure that the light-shielding hood 70 can be securely fixed to the lens 50, the insertion part 72 slightly protrudes from the cylinder of the outer cover 10. In this case, it is possible to prevent the outer cover 10 and the light-shielding part 71 from contacting each other and causing an obstacle to the attachment of the light-shielding hood 70. Although there is a slight gap between the outer cover 10 and the light-shielding part 71, if this gap is 10% or less, or 5% or less of the axial length of the light-shielding part 71, it will have almost no impact on the design.

[0022] The outer peripheral surface of the insertion part 72 is arranged to face the inner peripheral surface of the outer cover 10 with a slight gap therebetween. Note that within a range that does not hinder the insertion into the outer cover 10, the outer peripheral surface of the insertion part 72 may be in contact with the inner peripheral surface of the outer cover 10. Also, in order to suppress the intrusion of dust and dirt, the difference between the outer peripheral surface of the insertion part 72 and the inner peripheral surface of the outer cover 10 may be made as narrow as possible. In this case, it also leads to a reduction in leakage light. The insertion part 72 is preferably configured to contact the inner peripheral surface of the outer cover 10 at least when a force acts in the radial direction of the light-shielding hood 70. In this case, the load applied in the radial direction of the light-shielding hood 70 can be received by the outer cover 10, and damage to the parts, detachment of the light-shielding hood 70, etc. can be effectively suppressed. The outer diameter of the insertion part 72 is, for example, 90% or more, or 95% or more of the inner diameter of the outer cover 10.

[0023] The LED lamp 1 includes a pair of base pins 15 protruding from the bottom of an outer cover 10 formed in a bottomed cylindrical shape. The base pins 15 extend along the axial direction of the outer cover 10 from one axial end of the outer cover 10. The base pins 15 are metal power supply pins for electrically connecting to a circuit 30 (see FIG. 3 etc. described later) for supplying power to the light source unit 20, receiving power from the socket of the lighting device, and sending the power to the circuit 30. The tip of the base pin 15 has an enlarged diameter so as to be caught by the pin insertion portion of the socket.

[0024] Two base pins 15 are provided side by side in the radial direction of the outer cover 10. The distance between the pair of base pins 15 along the radial direction (hereinafter sometimes referred to as "pin distance") is not particularly limited, but for example, it is 40 mm or less, or 35 mm or less, or 30 mm or less. The pin distance means the shortest distance between the central axes of the two pins. An example of a suitable range of the pin distance is 15 mm or more and 40 mm or less, or 20 mm or more and 35 mm or less, or 25 mm or more and 30 mm or less. If the pin distance is within this range, it becomes easy to reduce the diameter of the lighting device.

[0025] The outer cover 10 is formed in a bottomed substantially cylindrical shape as a whole, but has a reduced diameter on the bottom side where the base pins 15 protrude. The outer cover 10 has a large-diameter portion 11 forming the appearance of a spotlight and a small-diameter portion 12 inserted into the socket 101. The outer cover 10 further has a convex portion 13 protruding axially from the small-diameter portion 12. The light-shielding hood 70 may be a metal member or a resin member. An example of the resin constituting the outer cover 10 is polybutylene terephthalate (PBT).

[0026] The outer cover 10 is formed with a large-diameter portion 11, a small-diameter portion 12, and a convex portion 13 in order from the opening side, and the convex portion 13 is also inserted into the socket 101. The socket 101 has a housing portion for the convex portion 13 together with a pin insertion portion. The outer diameter difference between the small-diameter portion 12 and the convex portion 13 is larger than the outer diameter difference between the large-diameter portion 11 and the small-diameter portion 12. The axial length of the large-diameter portion 11 is preferably 75% or more of the axial length of the outer cover 10, and may be 75% or more and 95% or less, or 80% or more and 90% or less.

[0027] The outer diameter of the large-diameter portion 11 is substantially the same as the outer diameter of the light-shielding portion 71 of the light-shielding hood 70 and the outer diameter of the socket 101, and their outer peripheral surfaces are flush. The outer diameter of the small-diameter portion 12 is preferably close to the inner diameter of the socket 101 within a range that does not hinder insertion into the socket 101. The convex portion 13 is formed in a cylindrical shape at the radial center of the outer cover 10 and has a protrusion 13a formed on the outer peripheral surface. The protrusion 13a catches on the socket 101 in the same way as the base pin 15, enhancing the reliability of fixing the LED lamp 1 to the socket 101.

[0028] Figure 3 is an exploded perspective view of the LED lamp 1. As shown in Figure 3, the LED lamp 1 includes a light source unit 20 including an LED element 21, a circuit 30 for supplying power to the light source unit 20, a holder 40 for holding the light source unit 20, and a lens 50 for controlling the light emitted from the light source unit 20. As described above, the LED lamp 1 includes a bottomed cylindrical outer cover 10 that houses the light source unit 20, the circuit 30, the holder 40, and the lens 50, and a base pin 15 that protrudes from the outer cover 10 and is electrically connected to the circuit 30. The LED lamp 1 further includes a heat sink 25 for dissipating the heat of the light source unit 20 and a cylindrical circuit holder 35 for holding the circuit 30. In addition, the LED lamp 1 includes a detachable light-shielding hood 70.

[0029] As will be described in detail later, the LED lamp 1 is configured such that the outer cover 10 and the light-shielding hood 70 are detachable. The light-shielding hood 70 is coupled to the lens 50 inside the outer cover 10 at the coupling protrusion 73a (mounting portion). The light-shielding hood 70 has a light-shielding portion 71 and an insertion portion 72 having an outer diameter smaller than that of the light-shielding portion 71, and is held in a state where the insertion portion 72 is inserted into the cylinder of the outer cover 10. Further, in the held state, since the light-shielding portion 71 and the outer cover 10 form substantially the same continuous outer surface, it is possible to realize a good appearance.

[0030] The LED lamp 1 is, for example, a lamp with a small diameter of 50 mm or less. The diameter of the large-diameter portion 11 of the outer cover 10 forming the appearance of the LED lamp 1 is, for example, 35 mm or more and 45 mm or less. The outer cover 10 is longer in the axial direction than in the radial direction, and its axial length may be 1.3 times or more and 1.7 times or less the diameter (the diameter of the large-diameter portion 11). Note that the circuit holder 25 and the holder 40 are members made of resin mainly composed of PBT or the like, and the heat sink 25 is a member made of metal mainly composed of aluminum or the like.

[0031] Since the LED lamp 1 is long in the axial direction, when assembling parts with the bottom side of the outer cover 10, such as the boundary position between the large-diameter portion 11 and the small-diameter portion 12 of the outer cover 10, as a reference position, it becomes difficult to assemble the lens 50 at the target position, and as a result, problems such as large variation in light distribution may occur in each product. Therefore, in the LED lamp 1, the lens 50 is fixed to the holder 40, and together with the holder 40, they form a module. Thereby, the distance between the light source unit 20 and the lens 50 becomes constant.

[0032] The LED lamp 1 includes an LED module 2 composed of a light source unit 20, a holder 40, and a lens 50. The holder 40 is formed in a bottomed cylindrical shape and includes a base portion 41 forming the bottom of the cylinder and a cylindrical wall 42 erected on the outer peripheral edge of the base portion 41. The base portion 41 has an opening 43 formed in the radially central portion and fixing claws formed around the opening 43. The light source unit 20 is disposed in the radially central portion from the lower surface side of the base portion 41 so as to close the opening 43 and is held by the fixing claws formed on the peripheral edge of the opening 43. The holder 40 holding the light source unit 20 is fixed to the heat sink 25 using screws 46, and then the lens 50 is fixed to the holder 40 to form the LED module 2.

[0033] The LED module 2 is disposed closer to the opening side than the axial center of the outer cover 10. A heat sink 25 that is long in the axial direction is accommodated on the bottom side of the outer cover 10 relative to the LED module 2. That is, although the lens 50 is attached at a position away from the bottom of the outer cover 10, since the light source unit 20, the holder 40, and the lens 50 are integrated to form the LED module 2, the distance between the light source unit 20 and the lens 50 can be managed with high precision, and the distance is not affected by the assembly error of other components.

[0034] The light source unit 20 includes an LED element 21 and a substrate 22 on which the LED element 21 is mounted. An example of a suitable light source unit 20 is a COB (Chip on board) type lighting light emitting diode device. A plurality of LED elements 21 are mounted, for example, at the center of the surface of a substantially square substrate 22 to form a light emitting portion having a circular shape in plan view. A pair of electrodes are provided around the light emitting portion, and wirings extending from the circuit 30 are connected thereto. The light source unit 20 is fixed to the base portion 41 of the holder 40 such that the light emitting portion including the LED element 21 is exposed from the opening 43 of the holder 40 and faces the opening of the outer cover 10.

[0035] The heat sink 25 is a member to which the holder 40 is screwed, and functions as a heat dissipation member that releases the heat of the light source unit 20. The heat sink 25 is a bottomed cylindrical body including a base portion 26 to which the holder 40 is fixed, and a cylindrical wall 27 erected on the outer peripheral edge of the base portion 26 and extending in a direction opposite to the lens 50. Since the heat sink 25 extends long in the direction opposite to the lens 50, it is possible to effectively release the heat of the light source unit 20 while suppressing the thermal influence on the lens 50. Further, in the present embodiment, the surface of the base portion 26 of the heat sink 25 to which the holder 40 is fixed serves as a reference surface for intersection determination when the lens 50 is assembled. Since the distance between the lens 50 and the reference surface is short, it is hardly affected by the machining accuracy of the parts and the assembly error of other parts, and the lens 50 can be accurately assembled at the target position.

[0036] A screw hole 26a and a wiring insertion hole 26b are formed in the base portion 26 of the heat sink 25. A screw 46 for fixing the holder 40 is fastened to the screw hole 26a, and wiring extending from the circuit 30 is passed through the wiring insertion hole 26b. The light source unit 20 is pressed against the base portion 26 by screwing the holder 40 to the base portion 26, and a good heat conduction path is formed between the light source unit 20 and the heat sink 25. It is preferable that a heat dissipation grease or a heat dissipation sheet is interposed between the light source unit 20 and the base portion 26.

[0037] The cylindrical wall 27 of the heat sink 25 is formed in a substantially cylindrical shape and houses a circuit holder 35 holding the circuit 30. A locking hole 28 used for fixing the circuit holder 35 and a guide groove 29 extending in the axial direction are formed on the outer peripheral surface of the cylindrical wall 27. The guide groove 29 is a groove into which a cylindrical projection 14 formed on the outer cover 10 fits, and is formed at a position overlapping the locking hole 28. In other words, the locking hole 28 is formed in the guide groove 29. In the present embodiment, the locking hole 28 is used for fixing the outer cover 10 and the circuit holder 35.

[0038] The circuit 30 is a power supply circuit that converts the alternating current of a commercial power supply into a direct current for lighting the LED element 21. The circuit 30 includes a circuit board 31 and circuit components 32 mounted on the circuit board 31. Base pins 15 are connected to the ends of the circuit board 31, and an alternating current is supplied to the circuit 30 from the socket 101 via the base pins 15. The circuit components 32 include switching elements, choke coils, capacitors, etc. Note that the capacitor has lower heat resistance compared to other circuit components 32 such as choke coils.

[0039] The circuit board 31 has, for example, a substantially rectangular shape and is held by the circuit holder 35 in a state where its longitudinal direction is along the axial direction of the outer cover 10. A pair of base pins 15 are provided in a state of protruding from one end in the longitudinal direction of the circuit board 31 to the bottom side of the outer cover 10. The capacitor is arranged so as to be sandwiched between the pair of base pins 15 and is mounted in a state of protruding from one end in the length direction of the circuit board 31 to the bottom side of the outer cover 10, similar to the base pins 15. In the LED lamp 1, the circuit board 31 is inserted into a board fixing portion 36 formed inside the cylinder of the circuit holder 35, and the base pins 15 are held by the base pin fixing portion 37. Thereby, the circuit 30 is held inside the cylinder of the circuit holder 35.

[0040] The circuit holder 35 is a substantially cylindrical member that holds the circuit 30 and is fixed to a heat sink 25 that covers the outside of the holder. The circuit holder 35 has a board fixing portion 36 formed inside the cylinder, a base pin fixing portion 37 formed at the axial end, and a fixing piece 38 that engages with the heat sink 25. The board fixing portion 36 includes a groove extending in the axial direction and is formed at two locations on the inner peripheral surface of the circuit holder 35. Each board fixing portion 36 holds both end portions in the width direction of the circuit board 31 inserted into the groove. Two base pin fixing portions 37 are provided corresponding to the pair of base pins 15 and have semi-annular grooves into which the flanges formed on the base pins 15 are fitted.

[0041] The fixing piece 38 is a part separated from the other part of the cylinder wall by two axially extending slits of the circuit holder 35 and is elastically deformable in the radial direction. A protrusion that engages with the heat sink 25 is formed at the tip of the fixing piece 38. The fixing pieces 38 are formed at two positions facing each other in the radial direction of the circuit holder 35. After fixing the circuit 30 inside the cylinder of the circuit holder 35, by inserting the circuit holder 35 into the cylinder of the heat sink 25, the protrusion of the fixing piece 38 fits into the locking hole 28 of the heat sink 25, and the circuit holder 35 is fixed to the heat sink 25.

[0042] FIG. 4 is a cross-sectional view of the LED lamp 1 cut along the axial and radial directions of the outer cover 10. FIG. 4 is a cross-sectional view of the LED lamp 1 cut along a first radial direction in which a pair of base pins 15 are arranged.

[0043] As shown in FIG. 4, the LED lamp 1 has an internal structure in which a bottomed cylindrical heat sink 25 is accommodated on the bottom side of the outer cover 10, and the LED module 2 is fixed on the base 26 of the heat sink 25. The heat sink 25 is accommodated inside the large-diameter portion 11 of the outer cover 10. The circuit holder 35 holding the circuit 30 is fixed inside the cylinder of the heat sink 25 as described above. A part of the circuit holder 35 protrudes from inside the cylinder of the heat sink 25 into the small-diameter portion 12 of the outer cover 10, and a part of the circuit component 32 enters the convex portion 13. For example, a capacitor that is vulnerable to heat is inserted into the convex portion 13. Alternatively, a component that generates more heat than other circuit components 32 may be accommodated in the convex portion 13.

[0044] The small-diameter portion 12 of the outer cover 10 has a smaller outer diameter and inner diameter than the large-diameter portion 11, and a step is formed at the boundary between the large-diameter portion 11 and the small-diameter portion 12 on the inner peripheral surface of the outer cover 10. The cylindrical wall 27 of the heat sink 25 is formed along the inner peripheral surface of the large-diameter portion 11 and extends to the vicinity of the step. On the outer peripheral surface of the circuit holder 35, a flange 39 that protrudes radially outward and catches on the step is formed. In this embodiment, when the flange 39 hits the step of the outer cover 10, the positions of the circuit holder 35 with respect to the outer cover 10, the circuit 30 held by the circuit holder 35, and the base pins 15 connected to the circuit 30 are regulated.

[0045] The heat sink 25 with the circuit holder 35 fixed inside the cylinder is inserted into the outer cover 10. At this time, the heat sink 25 is regulated with respect to the outer cover 10 by the cylinder inner protrusion 14 (see FIG. 3) provided on the inner surface of the outer cover 10. A through hole 12a for passing the base pins 15 is formed at the bottom of the outer cover 10 (the bottom of the small-diameter portion 12). The LED lamp 1 is designed such that the base pins 15 protrude from the through hole 12a to the outside of the outer cover 10 in a state where the heat sink 25 is fixed to the outer cover 10.

[0046] The LED module 2 is fixed to the base 26 of the heat sink 25 using screws 46 (see FIG. 3) in a holder 40 that holds the light source unit 20. The holder 40 is formed with screw insertion holes (not shown) through which the screws 46 pass. Further, on the base 26 of the heat sink 25, a screw hole 26a (see FIG. 3) to which the screw 46 is fastened and a wiring insertion hole 26b through which wiring extending from the circuit 30 passes are formed. Note that the LED module 2 does not have a fixing structure with respect to the outer cover 10.

[0047] An adhesive 49 is filled between the LED module 2 and the outer cover 10. The adhesive 49 is filled, for example, into the gap between the outer peripheral surface of the holder 40 and the inner peripheral surface of the outer cover 10 after the holder 40 is screwed to the heat sink 25. Further, the adhesive 49 is pressed by the lens 50 fixed to the holder 40, fills the gap between the outer peripheral surface of the LED module 2 and the inner peripheral surface of the outer cover 10, and joins the LED module 2 and the outer cover 10.

[0048] The adhesive 49 is not particularly limited, but from the viewpoints of adhesiveness, durability, etc., it is preferably mainly composed of a silicone resin. As the silicone-based adhesive, a two-component curable or moisture-curable adhesive can be used. Although the lens 50 of the LED module 2 is fixed by the adhesive 49, the lens 50 is fixed to the holder 40 in order to more surely prevent the lens 50 from falling off even if the adhesive force decreases due to the aging deterioration of the adhesive 49. Further, by providing the fixing structure between the holder 40 and the lens 50, the distance between the light source unit 20 and the lens 50 is regulated with high precision.

[0049] The LED module 2 is arranged, for example, within a range of 30% or less, or 20% or less of the axial length of the outer cover 10 from the opening of the outer cover 10. That is, the internal space of 70% or more of the axial length of the outer cover 10 is occupied by the circuit 30 and the heat sink 25. The components of the LED lamp 1 including the LED module 2, the heat sink 25, the circuit 30, and the circuit holder 35 are substantially all housed within the cylinder of the outer cover 10. For this reason, the axial length of the outer cover 10 is substantially equal to the axial length of the LED lamp 1. The axial length of the LED lamp 1 is not particularly limited, but as an example, it is 50 mm or more and 80 mm or less.

[0050] Hereinafter, with reference to FIGS. 5 to 7, the configurations of the lens 50 and the light shielding hood 70 of Embodiment 1 will be described in detail.

[0051] The light-shielding hood 70 is detachably attached to the lens 50. The engaging protrusions 73a (mounting part) and 73b (mounting part) are respectively fitted into the light-shielding hood fixing parts 60a and 60b to form the first engaging part and the second engaging part, and the light-shielding hood 70 and the lens 50 are combined. The light-shielding hood 70 is formed using resin or metal. The lens 50 is formed using resin or glass. An outer peripheral convex part 55 that protrudes radially outward from the axial-direction other end is formed at one axial-direction end of the outer peripheral part 54 of the lens 50.

[0052] The shapes and installed positions of the engaging protrusions 73a and 73b will be described. The engaging protrusions 73a and 73b are both formed to continuously protrude from the lower end (one axial-direction end) of the insertion part 72. The engaging protrusions 73a and 73b extend downward from the lower end of the insertion part 72 and further have an L-shaped form that bends at a substantially right angle in the circumferential direction of the light-shielding hood 70. Here, the engaging protrusion 73a and the engaging protrusion 73b bend in the same circumferential direction. Also, the outer peripheral surfaces of the engaging protrusions 73a and 73b and the insertion part 72 are smoothly continuous. A claw 74a for stably holding the attached state is provided at the tip of the engaging protrusion 73a, while there is no such protrusion on the engaging protrusion 73b.

[0053] The shapes and installed positions of the light-shielding hood fixing parts 60a and 60b will be described. The light-shielding hood fixing parts 60a and 60b are provided at positions corresponding to the engaging protrusions 73a and 73b on the outer peripheral surface of the outer peripheral convex part 55. The light-shielding hood fixing parts 60a and 60b each include recesses 61a and 61b and regulating protrusions 62a and 62b. The recesses 61a and 61b are recessed regions provided on the outer peripheral convex part 55, and the regulating protrusions 62a and 62b are parts that protrude outward from the recesses 61a and 61b.

[0054] The procedure for attaching the light-shielding hood 70 to the lens 50 will be described. While holding the light-shielding hood 70 so that the center lines substantially coincide with the lens 50, bring it closer to the lens 50 from above along the axial direction. At this time, adjust the rotation angle of the light-shielding hood 70 with respect to the lens 50 so that the engaging protrusions 73a and 73b can be inserted into the recesses 61a and 61b, respectively.

[0055] The light-shielding hood 70 can be attached by bringing it closer to the lens 50 from above, inserting the engaging protrusions 73a and 73b into the recesses 61a and 61b, respectively, and then rotating the light-shielding hood 70 relative to the lens 50. In this embodiment, three engaging protrusions (mounting portions), i.e., the engaging protrusions 73a and 73b combined, are used, but other numbers may also be used. The larger the number of mounting portions, the more stable and firmly it can be attached. Also, the smaller the number of mounting portions, the easier the attachment and detachment operations become. Considering both the fixing stability and the detachability of the light-shielding hood 70, the number of mounting portions is preferably three or four.

[0056] When the light-shielding hood 70 is rotated relative to the lens 50, the tip portions of the engaging protrusions 73a and 73b in the rotation direction abut against the outer peripheral convex portion 55, restricting further rotation and fixing it. Alternatively, in this case, excessive rotation may be restricted by the restricting protrusions 62a.

[0057] Also, the upward movement of the engaging protrusions 73a and 73b is restricted by the restricting protrusions 62a and 62b. This makes it possible to prevent the light-shielding hood 70 from accidentally coming off the lens 50.

[0058] When the light-shielding hood 70 is combined with the lens 50 and attached to the outer cover 10, the insertion portion 72 is substantially in contact with the inner peripheral surface of the outer cover 10. Here, "substantially in contact" means both the state where the insertion portion 72 is in contact with the inner peripheral surface of the outer cover 10 and the state where it is regarded as being in contact (for example, the gap between the outer peripheral surface of the insertion portion 72 and the inner peripheral surface of the outer cover 10 is less than 0.5 mm). Usually, with the LED lamp 1 other than the light-shielding hood 70 including the lens 50 assembled in advance, the light-shielding hood 70 is combined with the lens 50. Therefore, since the insertion portion 72 is substantially in contact with the inner peripheral surface of the outer cover 10, it becomes easy to align the engaging protrusions 73a and 73b with the recesses 61a and 61b when inserting them. Furthermore, since it also serves as a guide when rotating, the attachment and detachment operations can be performed more smoothly. In addition, it becomes difficult for foreign matters such as insects and dust to enter, which also leads to effects such as improvement in quality reliability and suppression of appearance deterioration. Also, when a load acts in the radial direction of the light-shielding hood 70, the outer cover 10 can receive the load, effectively suppressing damage to parts, dropping of the light-shielding hood 70, etc.

[0059] When the light-shielding hood 70 is combined with the lens 50 and attached to the outer cover 10, the outer peripheral surface of the light-shielding portion 71 and the outer peripheral surface of the outer cover 10 are in a substantially continuous state. Thereby, even though it is a configuration where only a light-shielding cover is attached to the lamp, it is possible to obtain a lighting device with a preferable appearance that is smooth with few irregularities, similar to the case of using a fixture including a lamp inside.

[0060] When the light-shielding hood 70 is combined with the lens 50, a structure for restricting rotation in the direction opposite to the attachment direction will be described. By the rotation operation, the light-shielding hood 70 and the lens 50 can be combined. The state before rotation (i.e., before attachment) is shown in Fig. 7(b), and the state after rotation (i.e., after attachment) is shown in Fig. 7(a). The engaging protrusion 73a has a claw 74a at the tip in the rotation direction during attachment. In the state after rotation, the claw 74a is engaged with the tip portion on the rotation direction side of the restricting protrusion 62a. In the present embodiment, the restricting protrusion 62a is formed with a gap between it and the outer peripheral convex portion 55, and the claw 74a is fitted into the gap and hooked on the restricting protrusion 62a. With these configurations, it becomes possible to restrict the operation in the direction opposite to the attachment direction. That is, the claw 74a and the restricting protrusion 62a constitute a rotation restricting portion that suppresses rotation in the direction opposite to the attachment direction.

[0061] By having the rotation restricting portion, rotation in the direction opposite to the attachment direction is suppressed, so it becomes possible to prevent the light-shielding hood 70 from accidentally falling off the lens 50. Alternatively, since the restricted state can be released by applying an appropriate rotational force, it becomes possible to attach and detach the light-shielding hood 70 as needed. When the light-shielding hood 70 is attached by means such as resin curing or screwing, it cannot be easily attached and detached by a general user. However, according to the present embodiment, even a general user without special skills or tools can easily attach and detach it.

[0062] When using a spotlight, there is a demand to use different types of light-shielding hoods according to the installation location and application. Even in such a situation, a great effect can be expected that a general user can easily replace (without relying on a construction store, etc.). Also, the force with which the rotation restricting portion restricts rotation can be appropriately adjusted by the width of the tip portion of the engaging protrusion 73a and the shape and size of the claw 74a.

[0063] The total number of engaging protrusions (mounting parts) including the engaging protrusion 73a and the engaging protrusion 73b may be one or two or more. In this case, the number of the engaging protrusion 73a provided with the claw 74a for restricting rotation in the opposite direction and the engaging protrusion 73b not provided with the claw may be appropriately selected according to the usage situation and purpose. The more claws 74a there are, the more stable and firmly it can be held, but if there are too many, excessive force may be required when removing it. As an example of a preferred form, there is a form in which two engaging protrusions 73a provided with claws 74a and one engaging protrusion 73b not provided with claws 74a are provided. In the present embodiment, two engaging protrusions 73a are arranged side by side in the radial direction of the light-shielding hood 70 and opposed to each other, and the engaging protrusion 73b is provided at a position substantially equidistant from the two engaging protrusions 73a.

[0064] Hereinafter, with reference to FIGS. 8 to 10, the configurations of the lens 80 and the light-shielding hood 90 of Embodiment 2 will be described in detail. Hereinafter, the differences from Embodiment 1 will be mainly described.

[0065] The shape of the fixing piece 93 of the light-shielding hood 90 and the position where it is installed will be described. The fixing piece 93 forms a substantially square frame having an opening 95 and is provided in the lower region of the insertion portion 92. Further, notches 94 are provided on both sides of the fixing piece 93 in the circumferential direction so that the fixing piece 93 is appropriately elastically deformed. The insertion portion 92 including the fixing piece 93 forms an envelope with a smooth outer peripheral surface.

[0066] The shape and the installed position of the lens hood fixing portion 83 of the lens 50 will be described. The lens hood fixing portion 83 is a granular protrusion provided on the outer peripheral portion 81 of the lens 50. The lens hood fixing portions 83 are formed at positions corresponding to each other so as to be fixed while being fitted with the fixing pieces 93. Further, an outer peripheral convex portion 82 is formed on the outer peripheral portion 81 of the lens 50 along the circumferential direction. The outer peripheral convex portion 82 is formed below the lens hood fixing portion 83 and functions as a stopper against which the lower end of the lens hood 90 externally fitted to the lens 80 abuts. As shown in FIG. 10, in the radial cross-sectional view, the lens hood fixing portion 83 has a shape in which the upper part is closer to being vertical than the lower part with the portion where the protrusion is maximum sandwiched therebetween.

[0067] The shape and the installed position of the rotation restricting concave portion 84 and the rotation restricting convex portion 96 will be described. The lens 80 and the lens hood 90 are provided with a rotation restricting concave portion 84 and a rotation restricting convex portion 96 as rotation load receiving portions for receiving the rotation load of the lens hood 90 with respect to the lens 80. The rotation restricting convex portion 96 is a substantially rectangular portion formed so as to protrude downward from the lower end of the insertion portion 92. The outer peripheral surface of the rotation restricting convex portion 96 is smoothly continuous with the outer peripheral surface of the insertion portion 92. The rotation restricting concave portion 84 is a concave portion provided in the outer peripheral convex portion 82 so as to accommodate the rotation restricting convex portion 96.

[0068] The lens hood 90 is detachably attached to the lens 80 by a pressing operation from above (in the second embodiment, there is no rotational operation as in the first embodiment). The lens hood 90 is brought closer to the lens 80 from above so that the positions of the fixing piece 93 (mounting portion) provided on the lens hood 90 and the lens hood fixing portion 83 provided on the outer peripheral portion 81 of the lens 80 correspond to each other.

[0069] Then, the lower frame portion of the fixing piece 93 (mounting portion) abuts on the upper portion of the light-shielding hood fixing portion 83. By further pressing the light-shielding hood 90 downward with respect to the lens 80, the lower portion of the fixing piece 93 (mounting portion) can overcome the protruding light-shielding hood fixing portion 83, and the light-shielding hood 90 can be attached. At this time, since the opening 95 holds the light-shielding hood fixing portion 83 so as to surround it, it is possible to prevent the light-shielding hood 90 from falling off the lens 80.

[0070] The cross-section of the light-shielding hood fixing portion 83 is closer to vertical on the upper side than on the lower side of the portion where the protrusion is maximum as described above. Because of this shape, when attaching the light-shielding hood 90 to the lens 80, it can be attached with a relatively small load. On the other hand, since the lower side of the convex portion has a shape closer to horizontal, a relatively large load is required when removing the light-shielding hood 90. Because of this shape, it is possible to effectively suppress unintentional detachment. Also, by appropriately deforming the inclination angles of the upper and lower sides across the location where the protrusion is maximum, it is possible to appropriately adjust the ease of attachment and detachment, and further, the ease of attachment and detachment such as prevention of unintentional detachment.

[0071] Since notches 94 serving as gaps are provided on both sides of the fixing piece 93, when attaching the light-shielding hood 90, when the lower frame of the fixing piece 93 overcomes the light-shielding hood fixing portion 83, the fixing piece 93 is easily elastically deformed, and the light-shielding hood 90 can be attached with an appropriate load. Also, it is possible to control the ease of attachment and detachment by appropriately adjusting the width and length of the notches 94.

[0072] In this embodiment, it is possible to receive the load in the rotational direction by the rotation restricting concave portion 84 and the rotation restricting convex portion 96. When the light shielding hood fixing portion 83 and the fixing piece 93 are combined to form a fitting structure as described above, the rotation restricting concave portion 84 accommodates the rotation restricting convex portion 96. At this time, although it is smoothly accommodated, the relative rotation between the light shielding hood 90 and the lens 80 in the radial direction is substantially restricted. According to this configuration, since the load in the rotational direction is received by the rotation restricting concave portion 84 and the rotation restricting convex portion 96, the light shielding hood fixing portion 83 and the fixing piece 93 are relieved from receiving the load in the rotational direction, leading to an improvement in reliability.

Explanation of Signs

[0073] 1 LED lamp 2 LED module 10 Outer cover 11 Large diameter portion 12 Small diameter portion 12a Through hole 13 Convex portion 13a Projection 15 Base pin 20 Light source unit 21 LED element 22 Substrate 25 Heat sink 26 Base 26b Wiring insertion hole 27 Cylindrical wall 30 Circuit 31 Circuit board 32 Circuit component 35 Circuit holder 36 Substrate fixing portion 37 Base pin fixing portion 39 Flange 40 Holder 42 Cylindrical wall 43 Opening 44 Concave portion 45 Locking hole 49 Adhesive 50 Lens 52 Exit surface 52a First region 52b Second region 53 Protrusion 54 Outer Periphery 55 Outer Peripheral Protrusion 60a, 60b Light Shielding Hood Fixing Part 61a, 61b Recess 62a, 62b Regulation Protrusion 70 Light Shielding Hood 71 Light Shielding Part 72 Insertion Part 73a, 73b Engagement Protrusion 74a Claw 80 Lens 81 Outer Periphery 82 Outer Peripheral Protrusion 83 Light Shielding Hood Fixing Part 84 Rotation Regulation Recess 90 Light Shielding Hood 91 Light Shielding Part 92 Insertion Part 93 Fixed Piece 94 Notch 95 Opening 96 Rotation Regulation Protrusion 100 Connecting Appliance 101 Socket 102 Plug 103 Shaft 104 Wiring Duct Rail

Claims

1. An LED lamp detachable from a socket, comprising: a light source unit including an LED element; a circuit for supplying power to the light source unit; a lens for controlling light emitted from the light source unit; a bottomed cylindrical outer cover for housing the light source unit, the circuit, and the lens; a base pin protruding from the outer cover and electrically connected to the circuit; a cylindrical light-shielding hood including a light-shielding portion extending from an opening of the outer cover and an insertion portion inserted into the cylinder of the outer cover; The LED lamp is provided with.

2. In the LED lamp according to claim 1, The light-shielding hood is detachably attached.

3. In the LED lamp according to claim 2, The light-shielding hood is detachably attached to the lens by fitting a mounting portion provided on the light-shielding hood and a light-shielding hood fixing portion provided on the lens.

4. In the LED lamp according to claim 1 or 2, The insertion portion of the light-shielding hood is configured to contact the inner peripheral surface of the outer cover when a force acts at least in the radial direction of the light-shielding hood.

5. In the LED lamp according to claim 3, The light-shielding hood and the lens are coupled to each other by relatively rotating them.

6. In the LED lamp according to claim 5, The lens and the light-shielding hood are provided with a rotation restricting portion for restricting rotation in a direction opposite to the rotation direction when the light-shielding hood is attached to the lens.

7. In the LED lamp according to claim 3, The light-shielding hood and the lens are coupled by inserting the lens into the cylinder of the light-shielding hood and applying an axial load.

8. In the LED lamp according to claim 7, The lens and the light-shielding hood are provided with a detachment restricting portion for suppressing axial detachment of the light-shielding hood from the lens.

9. In the LED lamp according to claim 7, The lens and the light-shielding hood are provided with a rotation load receiving portion for receiving a rotation load of the light-shielding hood with respect to the lens.

Images