JP2016219325A - Lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp device capable of reproducing glitter as if an incandescent clear bulb were lit and of enhancing its compatibility with a luminaire.SOLUTION: A lamp device 10 comprises a body 11, a light-emitting section 37, a transparent globe 16, a light guide body 14, and a power feeding section 19. The light-emitting section 37 is provided at one end side of the body 11. The globe 16 is provided at one end side of the body 11 so as to cover the light-emitting section 37. The light guide body 14 is formed into a columnar shape having a diameter of 4 to 9 mm, has one end protruded into the globe 16 and the other end facing the light-emitting section 37, and is provided with a prism 43 on a surface of a recessed portion 42 while being provided with the recessed portion 42 at one end. The power feeding section 19 is provided at the other end side of the body 11.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a lamp device using a light guide.

  Conventionally, there is an incandescent clear light bulb that uses a transparent glass globe and allows the filament to be seen directly. When this incandescent clear light bulb is lit, strong light is emitted from the filament that can be seen directly through the glass globe, so that a glittering feeling can be obtained and a lighting effect can be obtained.

  There is also a lamp device that uses a light emitting element as a light source and uses a transparent globe and can be replaced with an incandescent clear bulb. In this lamp device, light from the light emitting element is emitted into the globe by a lens, or a light emitting module having a plurality of light emitting elements is arranged in the inner space of the globe.

  However, with a lamp device using a transparent globe, it has been difficult to reproduce the glittering feeling that an incandescent clear light bulb is lit. Therefore, there has been a problem in the adaptability of the lamp device to a lighting device such as a chandelier or a lighting device for a store for which an incandescent clear light bulb capable of obtaining a sparkle is suitable.

US Pat. No. 6,803,607

  The problem to be solved by the present invention is to provide a lamp device that can reproduce the glittering feeling that an incandescent clear light bulb is lit, and can improve the adaptability to a lighting device.

  The lamp device of the embodiment includes a housing, a light emitting unit, a transparent globe, a light guide, and a power feeding unit. The light emitting unit is provided on one end side of the housing. The globe is provided on one end side of the housing so as to cover the light emitting unit. The light guide is formed in a cylindrical shape having a diameter of 4 to 9 mm, one end protrudes into the globe, the other end faces the light emitting portion, a recess is provided at one end, and a prism is formed on the surface of the recess. Is provided. The power feeding unit is provided on the other end side of the housing.

  According to the present invention, it is possible to reproduce a glittering feeling as if the incandescent clear light bulb is lit, and it can be expected to improve the adaptability to the lighting device.

It is sectional drawing of the lamp device which shows one Embodiment. It is a perspective view of the decomposition | disassembly state of a lamp device same as the above. It is a perspective view of the decomposition | disassembly state of the light guide of a lamp apparatus same as the above, a cover, a light emitting module, and a heat sink. It is sectional drawing of the decomposition | disassembly state of a light guide and a cover same as the above. It is a perspective view of a lamp device same as the above. It is a perspective view of the light guide of a lamp device same as the above. It is sectional drawing of a light guide same as the above. It is an end elevation of a light guide same as the above. It is a light distribution diagram of a lamp device same as the above. It is a graph which shows the relationship between the vertex angle of the prism of a light guide, and the ratio of the luminous intensity of the light distribution angle of 120 degrees with respect to the luminous intensity of the light distribution angle of 0 degrees. It is a graph which shows the relationship between the angle of the recessed part of a light guide same as the above, and the ratio of the luminous intensity of the light distribution angle of 120 degrees with respect to the luminous intensity of the light distribution angle of 0 degrees. It is a graph which shows the relationship between the value of the depth / diameter of the recessed part of a light guide, and the ratio of the luminous intensity of the light distribution angle of 120 degrees with respect to the luminous intensity of the light distribution angle of 0 degrees.

  Hereinafter, an embodiment will be described with reference to FIGS.

  A lamp device 10 is shown in FIGS. The lamp device 10 is a light bulb shaped lamp that can be used by being attached to a socket for an incandescent light bulb for general illumination, and is a candle shaped lamp.

  The lamp device 10 includes a housing 11. On one end side of the housing 11, a heat radiating plate 12, a light emitting module 13, a light guide 14, a cover 15, and a globe 16 are disposed, and a case 17 and a power supply unit 18 are disposed inside the housing 11. In addition, a power feeding unit 19 is disposed on the other end side of the housing 11. The lamp device 10 has a virtual center axis (lamp axis) extending from the globe 16 to the power feeding unit 19, and the globe 16 side of the central axis is referred to as one end side, and the power feeding unit 19 side is referred to as the other end side.

  The housing 11 is made of a metal material. For example, the housing 11 is made of aluminum die casting. The casing 11 is formed in a cylindrical shape having a diameter on one end side larger than a diameter on the other end side and a diameter decreasing from the one end side toward the other end side. Inside the housing 11, a hollow portion that opens to one end and the other end is formed. A mounting surface 22 on which the peripheral portion of the heat sink 12 is placed is formed on one end surface of the housing 11, and the cover 15, the light emitting module 13, and the heat sink 12 are integrally fastened and fixed to the mounting surface 22. A plurality of screw holes 24 into which a plurality of screws 23 are screwed are formed. In the present embodiment, the screw holes 24 are provided at three locations in the circumferential direction of the housing 11, but only two screws 23 are used. An annular projecting portion 25 projects from the periphery of the mounting surface 22, and an annular mounting edge 26 projects from the inner periphery of the tip of the projecting portion 25.

  Further, as shown in FIGS. 1 to 3, the heat radiating plate 12 is formed in a substantially disc shape by a metal material such as aluminum. The light emitting module 13 is brought into contact with one end surface of the heat radiating plate 12 so as to be able to conduct heat, and the peripheral portion of the other end surface of the heat radiating plate 12 is placed on the placement surface 22 of the housing 11 so as to be able to conduct heat. An insertion groove 29 through which the screw 23 is inserted is formed in the peripheral portion of the heat sink 12, and a wiring groove 30 through which wiring for electrically connecting the light emitting module 13 and the power supply unit 18 is formed. Yes.

  The light emitting module 13 is a COB (Chip On Board) module in this embodiment. The light emitting module 13 is filled to seal the light emitting element 34 in the substrate 33, the plurality of light emitting elements 34 mounted on the substrate 33, the frame portion 35 surrounding the light emitting elements 34, and the frame portion 35. The phosphor layer 36 is provided. The surface of the phosphor layer 36 is configured as a light emitting unit 37.

  The substrate 33 has a flat plate shape, and a wiring pattern for electrically connecting the plurality of light emitting elements 34 is formed on one end surface. The substrate 33 is formed of an insulating material or a metal material. When the substrate 33 is made of a metal material, an insulating film is formed on the surface of the substrate 33, and a wiring pattern is formed on the insulating film. At least three locations around the periphery of the substrate 33 are formed with linear notches 38 that fit into the cover 15. Further, as shown in FIG. 2, a light emitting portion 37 is disposed at the center of one end surface of the substrate 33, and electrical components such as a connector 39 are disposed at the peripheral portion of the one end surface of the substrate 33. Electrical components such as the connector 39 are electrically connected to the wiring pattern.

  The light emitting element 34 is an LED. A blue light emitting LED is used as the LED.

  The frame part 35 is formed in an annular shape on the substrate 33 by an insulating material.

  The phosphor layer 36 contains a phosphor that is excited by the light of the light emitting element 34 in a transparent resin. For example, it contains a yellow phosphor that emits yellow light when excited by the blue light of a blue light emitting LED. The light emitting portion 37 that is the surface of the phosphor layer 36 emits white light.

  The light emitting unit 37 may be composed of an SMD (Surface Mount Device) package using LEDs, or an organic EL other than LEDs.

  Further, as shown in FIGS. 1 to 4, the light guide 14 is formed in a columnar shape by a transparent resin such as a silicone resin or glass. One end (hereinafter referred to as the tip) of the light guide 14 protrudes into the globe 16, the other end of the light guide 14 is fixed to the cover 15, and the other end of the light guide 14 is connected to the light emitting portion 37. It is opposed with a gap. A recess 42 is formed on the distal end surface of the light guide 14, and a prism 43 is formed on the surface of the recess 42.

  An incident surface 44 through which light emitted from the light emitting unit 37 enters the light guide 14 is formed on the other end surface of the light guide 14. On the front end side of the light guide body 14, a light radiating portion 45 that radiates light that enters the light guide body 14 and is guided through the light guide body 14 to the outside of the light guide body 14 is formed. In this light emitting portion 45, a part of the light guided in the light guide 14 is reflected by the prism 43 and emitted from the peripheral surface of the light guide 14, and is also guided in the light guide 14. Part of the light passes through the prism 43 and is emitted from the front end surface of the light guide 14. Therefore, the light radiating portion 45 is configured on the tip side of the light guide body 14 provided with the recess 42 and the prism 43, and from the light radiating portion 45, the side intersecting the axial direction of the light guide body 14, Light is emitted in a wide direction including a front end direction that is one end direction of the light guide body 14 and a rear direction from the light guide body 14 toward the side of the housing 11. The light emitted from the light emitting portion 45 of the light guide 14 reproduces a glittering feeling as if a candle-shaped incandescent clear light bulb is lit. The sense of glitter is used to mean that the light appears to shine beautifully.

  Further, the diameter d1 of the light guide 14 is 4 to 9 mm. The light guide 14 has a cylindrical shape with the same diameter from one end side (front end side) to the other end side, but the diameter on one end side (front end side) is smaller than the diameter on the other end side, and the one end side (front end) It may be a conical shape that tapers toward the side. Note that the diameter of the light guide 14 is larger than the diameter of the light emitting portion 37.

  The leading end of the light guide 14 protrudes in the central area in the axial direction in the globe 16. The axial central region in the globe 16 includes the axial center in the globe 16 and the vicinity of the center.

  6 to 8 show the recess 42 and the prism 43 of the light guide 14. The recess 42 of the light guide 14 is formed so that the depth L1 from the tip of the light guide 14 is deepest at the center of the recess 42. The depth L1 of the recess 42 is 1.0 to 5.0 mm. The angle θ of the recess 42 with respect to the direction orthogonal to the axial direction of the light guide 14 is 28 to 47 °.

  At the center of the recess 42, a flat portion 46 having an area ratio of 0.1 to 1.0% with respect to a cross section in a direction orthogonal to the axial direction of the light guide 14 is formed.

  The prism 43 includes a plurality of first lines 43H extending radially outward from the central axis of the light guide 14 (circumferential direction) and extending from the bottom portion of the concave portion 42 toward one end (tip end), and the central axis Radially from the first line 43H toward the outside (circumferential direction), and so that the height from the incident surface 44 is lower than the first line 43H from the bottom part toward the one end (tip) direction. And a plurality of second lines 43L extending in the direction.

  Specifically, the prisms 43 are formed in a triangular cross section having a ridge line 43a and valleys 43b on both sides, and are arranged in a plurality along the circumferential direction of the light guide 14, and each from the central axis of the light guide 14. It is provided radially.

  The apex angle α of the prism 43 is preferably in the range of 70 to 90 °. The apex angle α is an angle in a cross section in a direction perpendicular to the ridge line 43a of the prism 43.

  The number of the prisms 43, that is, the number of ridge lines 43a of the prisms 43 is preferably 4-18. The angle formed by the adjacent ridge line 43a and the central axis of the light guide 14 is preferably 20 to 90 °. In the present embodiment, the number of ridge lines 43a of the prism 43 is 12, and the angle formed between the adjacent ridge lines 43a and the central axis of the light guide 14 is 30 °.

  The depth L2 of the valley 43b of the prism 43 on the outer peripheral surface of the light guide body 14 is shallower than the depth L1 of the center of the recess 42.

  Further, as shown in FIGS. 1 to 4, the cover 15 is formed of an insulating resin material. The cover 15 has a conical cover portion 48 with a central top portion protruding to one end side, and is attached to one end side of the housing 11, and the one end side of the housing 11, the light emitting module 13, and the light guide Cover the other end of 14 and so on.

  A hole 49 through which the other end of the light guide 14 is inserted is formed in the top of the center of the cover 15. The hole 49 is formed in a cylindrical fixed cylinder 50 that protrudes from the top of the cover 15 toward the other end. A plurality of slits 51 opened at the other end are formed in the fixed cylinder 50, and the other end side of the fixed cylinder 50 can be elastically deformed in the outer diameter direction. The inner diameter of the fixed cylinder 50, that is, the inner diameter of the hole 49 decreases from one end side to the other end side, the inner diameter on the other end side of the hole 49 becomes the smallest, and the inner diameter d2 is smaller than the diameter d1 of the light guide 14 Is also small. Therefore, in order to insert the other end side of the light guide body 14 into the hole 49 of the cover 15, the light guide body 14 is press-fitted so that the fixed cylinder 50 is elastically deformed in the outer diameter direction. The light body 14 is press-fitted and fixed in the hole 49 of the cover 15. When the other end side of the light guide body 14 is press-fitted into the hole 49 of the cover 15, the light guide body is regulated by restricting the other end surface of the light guide body 14 with a stopper arranged in a fixed positional relationship with the cover 15. The axial positions of 14 and cover 15 can be positioned. The light guide body 14 and the cover 15 may be bonded with an adhesive to ensure the fixing.

  Two insertion holes 52 into which the two screws 23 are inserted are formed in the peripheral portion of the cover 15 and are hooked on the mounting edge 26 of the housing 11 at positions opposite to the two insertion holes 52. A claw portion 53 is projected.

  On the other end side of the cover 15, a fitting portion 54 for fitting the substrate 33 of the light emitting module 13 is formed. The fitting portion 54 includes protrusions 55 into which three cutout portions 38 provided around the substrate 33 are respectively fitted. Insertion holes 52 are respectively formed at the positions of the two protrusions 55, and claw parts 53 protrude from the positions of the remaining one protrusion 55.

  The globe 16 is formed of a transparent material having a light transmittance of 95% or more. As the transparent material, resin or glass is used. The globe 16 is hollow and formed in a conical shape that tapers toward one end, and the other end is opened. The globe 16 may be spherical as in the so-called PS type. On the other end side of the globe 16, a fixed edge 58 is provided so as to be fitted inside the mounting edge portion 26 of the housing 11 and bonded and fixed with, for example, a silicone adhesive. A light emitting portion 45 at the tip of the light guide 14 is disposed in the central region of the globe 16 in the axial direction.

  The case 17 is formed in a cylindrical shape from an insulating resin material. The case 17 is inserted into the casing 11 from one end side, and the fixing ring 61 is attached to the other end side of the case 17 protruding from the other end side of the casing 11, whereby the case 17 is fixed to the casing 11. A power feeding unit 19 is attached to the other end side of the case 17. A pair of substrate holders 62 are formed along the central axis at two opposing locations in the case 17.

  The power supply unit 18 converts AC power input from the power feeding unit 19 into predetermined DC power and supplies the converted DC power to the light emitting element 34 of the light emitting module 13. The power supply unit 18 includes a circuit board 65 and a plurality of electronic components mounted on the circuit board 65. The circuit board 65 is inserted between the pair of board holding portions 62 from one end side of the case 17 and is held by the case 17. The pair of AC power input units of the power supply unit 18 are electrically connected to the power feeding unit 19 by wiring, and the pair of DC power output units of the power supply unit 18 are electrically connected to the connector 39 of the light emitting module 13 by wiring. It is connected.

  In addition, the power supply unit 19 uses a base that can be connected to a socket for a general illumination incandescent bulb such as E17 or E26. The power supply unit 19 is not limited to the base, and may be a pair of pins depending on the lamp type.

  And the effect | action of this embodiment is demonstrated.

  At the time of assembling the lamp device 10, the case 17 and the power supply unit 18 are incorporated in the housing 11, the heat sink 12 and the light emitting module 13 are disposed on one end side of the housing 11, and the connector 39 of the power supply unit 18 and the light emitting module 13 is disposed. And connect with wiring.

  Thereafter, the claw portion 53 of the cover 15 is hooked on the mounting edge portion 26 of the housing, the cover 15 is covered with the light emitting module 13, and the screw 23 is inserted through the insertion hole 52 of the cover 15 and the insertion groove 29 of the heat radiator 12. By screwing into the screw holes 24, the cover 15, the substrate 33 of the light emitting module 13 and the heat sink 12 are fastened together to the housing 11, and the substrate 33 and the heat sink 12 are thermally coupled to the housing 11. .

  By fixing the cover 15 to the housing 11, the incident surface 44 of the light guide 14 that has been press-fitted and fixed to the cover 15 in advance is positioned at a predetermined position facing the light emitting portion 37. In the assembled state, there is a slight gap between the light incident surface 44 of the light guide 14 and the light emitting portion 37, and the light emitting portion 37 is located in a region facing the light incident surface 44 of the light guide 14. It becomes.

  The lamp device 10 is used by connecting the power supply unit 19 to a socket for a general illumination incandescent bulb of a lighting device such as a chandelier.

  When AC power is supplied to the lamp device 10 through the socket, the power supply unit 18 converts the AC power into predetermined DC power and supplies it to the light emitting element 34. Thereby, the light emitting element 34 emits light, and light is emitted from the light emitting unit 37.

  The light emitted from the light emitting unit 37 enters the light guide 14 from the incident surface 44 and is guided toward the light emitting unit 45 in the light guide 14. A part of the light guided to the light emitting part 45 is reflected by the prism 43 and radiated from the peripheral surface of the light guide 14, and a part of the light guided to the light emitting part 45 passes through the prism 43. The light is transmitted and emitted from the front end surface of the light guide body 14. Therefore, from the light emitting portion 45 of the light guide 14, the tip direction of the light guide 14, the lateral direction intersecting the axial direction of the light guide 14, and from the light guide 14 to the side of the housing 11. Light is emitted in a wide direction including the rear direction. The light emitted from the light emitting portion 45 of the light guide 14 passes through the globe 16 and is irradiated onto the illumination space.

  The light reflected by the prism 43 is guided by the light incident on the surface of the prism 43 being directly radiated from the peripheral surface of the light guide 14 or the light incident on one surface of the prism 43 being reflected on the other surface. Radiated from the peripheral surface of the light body 14.

  FIG. 9 shows a light distribution diagram of the lamp device 10. In this case, the diameter d1 of the light guide 14 is 6 mm, the depth L1 of the recess 42 is 2.4 mm (the angle θ of the recess 42 is 38.7 °), and the apex angle α of the prism 43 is 85 °.

  It was confirmed that the lamp device 10 having this light distribution characteristic can provide a glittering feeling when viewed from any direction within a range where the tip of the light guide 14 can be seen.

  At this time, the luminous intensity at the light distribution angle of 0 ° which is the tip direction of the lamp device 10 is 19 cd, the luminous intensity at the light distribution angle of 120 ° as the representative angle in the rear direction of the lamp device 10 is 7 cd, and the luminous intensity at the light distribution angle of 0 °. The ratio of the luminous intensity at a light distribution angle of 120 ° with respect to was 0.368.

  Therefore, it has been found that the glittering feeling can be reproduced if the ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 ° is 0.3 or more. Therefore, it is preferable to define the concave portion 42 and the prism 43 of the light guide 14 with a ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 ° being 0.3 or more.

  FIG. 10 shows the relationship between the apex angle α of the prism 43 of the light guide 14 and the ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 °. The apex angle α of the prism 43 was in the range of 70 to 90 °, and the ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 ° was 0.3 or more. Therefore, by setting the apex angle α of the prism 43 to 70 to 90 °, it is possible to reproduce the glittering feeling no matter what direction the lamp device 10 is viewed within the range where the tip of the light guide 14 can be seen.

  FIG. 11 shows the relationship between the angle θ of the recess 42 of the light guide 14 and the ratio of the luminous intensity at a light distribution angle of 120 ° to the luminous intensity at a light distribution angle of 0 °. The angle θ of the recess 42 was in the range of 28 to 47 °, and the ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 ° was 0.3 or more. Therefore, by setting the angle θ of the recess 42 to 28 to 47 °, it is possible to reproduce the glittering feeling no matter what direction the lamp device 10 is viewed within the range where the tip of the light guide 14 can be seen.

  FIG. 12 shows the relationship between the value of depth L1 / diameter d1 of the recess 42 of the light guide 14 and the ratio of the luminous intensity at the light distribution angle of 120 ° to the luminous intensity at the light distribution angle of 0 °.

  There is a correlation between the diameter d1 of the light guide 14 and the ratio of the light intensity of 120 ° to the light intensity of 0 °, and when the diameter d1 of the light guide 14 is 4 to 9 mm, the light distribution angle is 0 °. In order to satisfy the ratio of the luminous intensity of the light distribution angle of 120 ° to the luminous intensity of 0.3 or more, the depth L1 / diameter d1 of the concave portion 42 of the light guide 14 is set to 0.25 to 0.55. desirable.

  From this relationship, the depth L1 of the recess 42 at which the ratio of the luminous intensity at the light distribution angle 120 ° to the luminous intensity at the light distribution angle 0 ° is 0.3 or more is 1 when the diameter d1 of the light guide 14 is 6 mm. When the diameter d1 of the light guide 14 is 4 mm, it is 1.0 to 2.2 mm, and when the diameter d1 of the light guide 14 is 9 mm, it is 2.4 to 5.0 mm. .

  Therefore, when the diameter d1 of the light guide 14 is 4 to 9 mm, the lamp device from which direction the tip of the light guide 14 can be seen by setting the depth L1 of the recess 42 to 1.0 to 5.0 mm. Even if you look at 10, you can reproduce the sparkle.

  As described above, the lamp device 10 according to the present embodiment reproduces the glittering feeling that a candle-shaped incandescent clear light bulb is lit by providing the prism 43 on the surface of the concave portion 42 at the tip of the light guide 14. can do.

  Even when the prism 43 is not provided on the surface of the concave portion 42 at the tip of the light guide 14 and the concave portion 42 is formed as an arc concave surface or a conical concave surface, and an aluminum vapor deposition film is formed on the surface of the concave portion 42, the light guide is also provided. The tip of the body 14 appears to shine, and a glittering feeling can be reproduced. However, the reflectance of the aluminum vapor deposition film is about 85 to 88%, the reflection loss is large, and the efficiency of the lamp device 10 is lowered.

  On the other hand, by providing a prism 43 on the surface of the recess 42 at the tip of the light guide 14, light can be reflected without an aluminum vapor deposition film, and the reflection loss due to the prism 43 is reflected by the aluminum vapor deposition film. Compared to the loss, the efficiency of the lamp device 10 can be increased.

  In addition, since the light guide 14 includes the plurality of prisms 43, it is possible to reproduce the glittering feeling when the globe 16 of the lamp device 10 is viewed from any direction.

  Since the number of the prisms 43, that is, the number of the ridge lines 43a of the prism 43 is 4 to 18, the manufacturability of the prisms 43 is good, and a glittering feeling can be reproduced. When the number of the ridge lines 43a is less than 4, it is difficult to obtain a glittering feeling depending on the direction in which the lamp device 10 is viewed. Therefore, in order to obtain a glittering feeling, the number of the ridge lines 43a of the prism 43 is preferably large, but if it is more than 18, there is a difficulty in manufacturing. Therefore, the number of ridge lines 43a of the prism 43 is preferably 4-18.

  By setting the apex angle α of the prism 43 to 70 to 90 °, it is possible to reproduce the glittering feeling no matter what direction the lamp device 10 is viewed within the range where the tip of the light guide 14 can be seen.

  Further, since the ridge lines 43a of the prisms 43 are provided radially, the light can be reflected evenly around the light guide 14.

  Further, the depth L2 of the valley 43b of the prism 43 on the outer peripheral surface of the light guide body 14 is shallower than the depth L1 of the center of the recess 42, so that the light guided in the light guide body 14 is prismatic. With 43, it can be reflected in a wide range in the axial direction.

  Further, since the flat portion 46 is formed at the center of the concave portion 42, the prism 43 can be formed, and the light guided to the flat portion 46 is transmitted to the front end of the light guide body 14. Can improve the light distribution characteristics. However, if the area of the flat part 46 is too large, light will be emitted too much forward, and if it is too small, light will not be emitted in the forward direction. It is desirable that the area ratio with respect to the cross section in the direction orthogonal to the axial direction of the light guide 14 is 0.1 to 1.0%.

  Moreover, since the diameter d1 of the light guide 14 is 4 to 9 mm, the efficiency is high, and a glittering feeling can be reproduced. That is, if the diameter d1 of the light guide 14 is smaller than 4 mm, the light emitting portion 37 is reduced accordingly and the output is low, and the light of the light emitting portion 37 is less likely to enter the light guide 14 and is efficient. In addition, if the diameter d1 of the light guide 14 is larger than 9 mm, the light emitting portion 45 becomes large, and the glittering feeling is lowered.

  Furthermore, since the light radiating portion 45 of the light guide 14 is disposed in the central region in the axial direction of the globe 16, it can reproduce the glittering feeling.

  In addition, the size of the incident surface 44 of the light guide 14 is larger than the size of the light emitting unit 37. Therefore, most of the light radiated from the light emitting portion 37 is incident on the light guide body 14, and the incident loss can be reduced, thereby increasing the light radiated from the light radiation portion 45 of the light guide body 14, A feeling of glitter can be improved.

  Further, when the light guide body 14 is formed of a silicone resin, for example, the light guide body 14 is thermally stronger than an acrylic resin, and the light guide body 14 can be disposed close to the light emitting portion 37, so that the incident loss can be reduced. Thereby, the light emitted from the light emitting portion 45 of the light guide 14 can be increased, and the glittering feeling can be improved.

  Further, the cover 15 covers the light emitting portion 37 and the other end side of the light guide body 14, so that light is prevented from being emitted from the vicinity of the housing 11, and light is emitted only from the front end of the light guide body 14. In this way, the glittering feeling can be improved.

  Further, the cover 15 has a function of covering the other end side of the light emitting unit 37 and the light guide body 14 and a function of fixing the heat radiating plate 12 and the light emitting module 13 to the housing 11, in addition to the light guide body 14. Since it also has a fixing function, the number of parts can be reduced and the lamp device 10 can be simplified.

  Further, the inner diameter d2 of the hole 49 of the cover 15 is smaller than the diameter d1 of the light guide 14, and the light guide 14 is press-fitted and fixed in the hole 49, so the light guide 14 is fixed to the cover 15 with a simple structure. Can be improved.

  The lamp device can also be applied to a lamp device using a spherical glove that approximates an incandescent bulb for general illumination. In this case, the light emission part of the light guide can be arranged at the center of the maximum outer diameter part of the globe to reproduce the glittering feeling.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Lamp device
11 Enclosure
14 Light guide
16 Globe
19 Feeder
37 Light emitter
42 Recess
43 Prism
43H 1st line
43L second line
46 Plane section

Claims (5)

A housing;
A light emitting part provided on one end side of the housing;
A transparent glove provided on one end side of the casing so as to cover the light emitting part;
It is formed in a cylindrical shape with a diameter of 4 to 9 mm, one end projects into the globe, the other end faces the light emitting part, a recess is provided at one end, and a prism is provided on the surface of the recess A guided light guide;
A power feeding unit provided on the other end of the housing;
A lamp device comprising: The prism is radially outward from the center and radially between the plurality of first lines extending from the bottom of the recess toward the one end and the first line outward from the center. The lamp device according to claim 1, further comprising: a plurality of second lines extending lower than the first line from the bottom toward the one end. The lamp device according to claim 1, wherein an apex angle of the prism is 70 to 90 °. The lamp device according to any one of claims 1 to 3, wherein the light guide has a flat portion at the center of the recess. The lamp device according to any one of claims 1 to 4, wherein a ratio of a depth of the concave portion to a diameter of the light guide is 0.25 to 0.55.

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