TW201229425A - Lamp structure - Google Patents

Abstract

A lamp structure includes a lamp housing, a heat sink, a metal foil and a light source. The lamp housing has a containing space and a housing opening. The heat sink is disposed in the housing opening, and a part of the heat sink is disposed within the containing space. The metal foil includes a first metal foil and a second metal foil. The first metal foil has a first surface attached on the part of the heat sink and the second metal foil is extended within the containing space. The light source is coupled to a second surface of the first metal foil. As a result, the heat generated from the light source is uniformly distributed within the lamp housing through the metallic foil to reduce concentration of heat energy.

Description

201229425

TW7153PA VI. Description of the Invention: [Technical Field] The present invention relates to a lamp structure, and more particularly to a lamp structure for improving the temperature uniformity inside a lamp cover. [Prior Art] With the development of various light sources, light-emitting diodes (LEDs) have been gradually applied to the field of illumination due to the increase in power. In addition to its limited illumination and illumination range, LED lighting devices with a single point source are not suitable for reading. The bright spots caused by the point source make the user's eyes feel uncomfortable. In order to increase the overall illumination of the illuminating device, a plurality of high-power LEDs arranged in a plane are used, and the lampshade is used to moderately soften the light to alleviate the blinking of the point source. In addition, a light guide column or a light guide plate is used as a light mixing mechanism to provide a relatively uniform surface light source. A plurality of point light sources of the device are disposed on the side of the light guide plate, and the light enters the light guide plate from the side, and then The light guide plate is penetrated through the surface. However, the intensity of the transmitted light is inversely proportional to the distance to the side, so the intensity of the surface light source generated by the light guide plate still has a gradient change. In order to increase the uniformity of illumination, a plurality of point light sources are disposed on opposite sides of the light guide plate, thereby slowing the gradient of the intensity variation of the surface light source; however, the structure is generally only applicable to the light guide plate of a symmetrical structure, in particular It has sides that are parallel to each other, such as a rectangle, so the illumination field shape that the device can provide is limited, and its practicality is also limited. In addition, LEDs are more sensitive to temperature effects, and LEDs have a shortened lifetime and attenuated light output due to temperature rise. The common heat dissipation strategy is 201229425 TW7153PA 1 'The LED circuit substrate is combined with a heat sink by a thermal interface material (TIM), and the heat sink is used to transfer heat to the external environment for heat exchange. Although this method can achieve the purpose of heat dissipation, the disadvantage is that the heat sink exchanges heat with the outside world, and is often the local hot zone of the system. The local hot zone may cause discomfort to the user and may even cause safety concerns such as burns. In order to solve the problem of the local hot zone, it is necessary to increase the area of the heat sink or use a fan to forcibly equalize the temperature inside the lampshade. The former will force the lampshade to increase the space to place a larger heat sink, and the latter will have the problem of life and reliability because the fan is a moving piece. The above heat dissipation strategy will destroy the small size and long life of the LED. Advantages, can not be applied to the structure of lamps for miniaturization or special modeling. SUMMARY OF THE INVENTION The present invention relates to a lamp structure that improves the problem of a local hot zone to uniformly heat the interior of the lampshade. In addition, by utilizing the high ductility of the metal foil and the ability to bend and extend at will, the limitation of the geometry of the lampshade is overcome, and the heat dissipation area of the heat sink is increased to increase the heat dissipation. According to an aspect of the invention, a lamp structure is provided comprising a lamp cover, a heat sink, a metal foil and a light source. The lampshade has a receiving space and a lampshade opening. The heat sink is disposed at the opening of the lamp cover such that a portion of the heat sink is located in the receiving space. The metal foil includes a first metal foil and a second metal foil, the first side of the first metal foil being attached to the heat sink of the portion and the second metal foil extending within the receiving space. The light source is coupled to the second side of the first metal foil. According to another aspect of the present invention, an assembly of a metal foil is proposed 201229425

TW7153PA ί and ΐ in the second cover. The assembly method comprises: providing a first metal pig piece μ μ m1 piece to cut into a plurality of strips of thin pieces: the first end of the piece is connected to the first metal piece, the first metal and the second metal and the second surface. A plurality of light-emitting elements are disposed on one side of the enamel, and the first side of the first metal foil is attached to the affixer. The second end of each strip is formed by a radial structure of the heat sink. Cover the top cover with the cover # # so that each strip is placed flat inside the lamp cover. Ο 务 务 Ο Ο , , , Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο The metal foil is transmitted to the heat sink, and the heat sink is directly connected to the external environment for heat exchange. The advantage of this architecture is that the metal foil can evenly heat the lamp housing to solve the problem of local hot zone 'and increase the dispersibility' to increase the heat dissipation, while reducing the burden of the heat sink, and not overheating. The invention is suitable for sealing The luminaire of the type is used. However, if the design conditions permit the squatting, the hole can be opened in the lampshade 'at this time' because the present invention can uniformly heat, so the opening position can be more flexibly selected, and the heat dissipation can be improved. In addition, ': the foil is small in size and the reliability of the non-moving parts is high', so it is in line with the small size of the LED and the advantages of the backup. In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below in conjunction with the accompanying drawings, which are described in detail below. [Embodiment] The lamp structure of the present embodiment is based on LEDs. For illuminating elements and with a gold 201229425

The TW7153PA is a lap joint, and the metal slab is attached to the periphery of the heat sink to increase the heat dissipation area of the device. The light-emitting element, the metal box and the heat sink are connected by a high thermal conductivity thermal interface material, and the metal duct is highly malleable and can be bent and extended to overcome the limitation of the geometric shape of the lamp cover. Please refer to FIG. 1A and FIG. 1 , wherein FIG. 1B is a schematic view showing the structure of a light-emitting diode lamp according to an embodiment, and FIG. 1B is a schematic view showing the structure of the light-emitting diode lamp of FIG. 1A along a section line. The lamp structure 1A includes a lamp cover 110, a heat sink 13A, a metal foil, and a light source 150. The lamp cover 110 has a receiving space 丨丨肫 and a lamp cover opening portion ii 〇 b. The heat sink 130 is disposed in the shade opening portion u〇b such that the heat sink 130 of the portion 130a is located in the housing space u〇a. The metal foil 14 includes a first metal foil 141 and a second metal foil 142. A first surface S1 of the first metal foil 141 is attached to the heat sink of the portion 13A. The two metal foil pieces 142 extend in the accommodating space 110a. The light source 15A is coupled to a second surface 32 of the first metal foil 141. In addition, the illuminating structure 1 〇〇 can further include a light guide plate 12 〇 in a flat shape and disposed in the accommodating space u 〇 a of the lamp cover 110. The light guide plate 12A has an opening portion 120a corresponding to the lamp cover opening portion u〇b, and the heat sink 111 of the portion ιιι> is passed through the opening portion 12A and the lamp cover opening portion u〇b. The first metal f is coupled to the heat sink hi of the portion 11 la from the opening portion 12A of the sheet 141 in a surrounding manner. The light source 15 is disposed on the first metal foil 141 and faces the light guide plate 120. In one embodiment, the light guide plate 12 is formed by a side wall of the opening portion 120a as a light incident surface 12b. The light source 15A includes a plurality of light-emitting pieces 152 which radiate light to the light guide plate 201229425.

1 TW7153PA 120 into the light surface 120b. In one embodiment, the luminaire structure 100 further includes a lamp holder 160. The top of the lamp holder 160 includes a bearing 162, and the bottom portion 111 of the lamp housing 110 is fixed to the lamp holder 160 by bearings 162. In addition, a movable joint 112 is attached to the bottom of the heat sink 130, and the joint 112 is fixed in the bearing 162 of the lamp holder 160 to adjust the angle of the lamp cover 110. The opening 120a of the light guide plate 120 is correspondingly located above the joint 112, and the heat sink 130 located in the opening portion 110b of the lamp cover is connected or locked integrally with the joint 112, so that the heat absorbed by the heat sink 130 can be conducted through the joint 112. To the light stand 160. In addition, the second side S2 of the first metal foil 141 is coupled to the inner annular surface 152a of the annular circuit board 152 and contacts the inner annular surface 152a to absorb heat generated by the light-emitting element 154 during operation. In addition, the first side S1 of the first metal foil 140 is coupled to the heat sink 130 and is coupled to the heat sink 130 to conduct a portion of the heat to the joint 112 at the bottom of the globe 110 and then to the light fixture 160 by the joint 112. Additionally, in one embodiment, the light guide plate 120 includes an upper surface 122 with Q and a lower surface 124 opposite the upper surface 122. The upper surface 122 is provided with pits 122a (or bumps) that reflect light. Therefore, when the annularly arranged light-emitting elements 154 emit light, the light enters the light guide plate 120 via the light-incident surface 120b, and is reflected downward by the concave spots 122a (or bumps) on the upper surface 122 by the lower surface 124 (ie, The light exiting surface penetrates the light guide plate 120, and its reflection path L is indicated by an arrow. Thus, the light of the light source 150 is refracted downward through the light guide plate 120 to form a light source. In addition, a light shielding sheet 126 may be disposed on the upper surface 122 of the light guide plate 120, and the outer edge of the light guide plate 120 is covered by the outer casing 116 of the light shield 110, so that the lower surface 124 is the main light guide plate 120. 201229425 TW7153PA · Light The light emitting surface is perpendicular to the light incident surface 120b, and the light emitting surface is a plane or a matte surface, so that the light that penetrates the light guide plate 120 can be a uniform illumination surface light source. In an embodiment, in addition to reflecting light, the light shielding sheet 126 can prevent the projection of the metal foil 140 on the portion of the light guide plate 120 in the lamp cover 110 to improve the uniformity of illumination. Additionally, in one embodiment, the toroidal circuit board 152 can be a flexible circuit board and the light emitting elements 154 can be electrically connected to an external power source or driver via a flexible circuit board. However, in practical applications, the light-emitting element 154 may be attached to the heat sink 130, and the electrical connection may be otherwise connected, for example, by separately drawing wires or separately connecting the flexible circuit boards, thereby reducing the number of wires. The thermal resistance between the light-emitting element 154 and the heat sink 130 increases the amount of heat dissipation. Moreover, without changing the design of the heat sink 130, the metal foil 140 is radially outwardly extended from the periphery of the heat sink 130 so that a portion of the heat is absorbed through the metal foil 140 to increase the overall heat dissipation. In addition, the second metal foil 142 is made of a soft material, for example, a single layer or a plurality of layers of copper foil or aluminum foil, and can be cut into a plurality of long strips 142a, which are fixed in shape and structure with respect to the heat sink 130. The second metal foil 142 can be used in the lampshade 110 to change the shape or fit the assembled space, and is not limited by space. Therefore, it can be practically applied to various special-shaped lampshades 110, such as applications. The flat lamp 110 is flattened in Fig. 1B. In one embodiment, each of the strips 142a has a first end E1 and a second end E2. The first end E1 is connected to the first metal foil 141, and the second end E2 is outwardly surrounded by the heat sink 130. Bending to form a radial structure. In this embodiment, the shape of the lampshade 110 is not limited to an elliptical shape, and 201229425

* The length of the TW7153PA strip 142a is not limited to extend to the outer edge of the globe 110 in equal length. In an embodiment, the length of the long strip 142a may be different according to the distance D between the first end E1 and the outer edge of the lamp cover 110. The closer the distance D is, the shorter the length is; otherwise, the farther the distance D is, the length The longer, the length of the elongated sheet 142a is adjusted similarly in a proportional relationship. In addition, the longer the length of the long strip 142a and the wider the width, the larger the heat dissipating area and the longer the heat dissipating distance, so that the length or width of each strip 142a can be adjusted to increase the range of heat dissipation. . Therefore, when the arrangement density of the light-emitting element 154 0 is higher or the heat generation amount is higher, the local high temperature is more obvious. Therefore, the lamp cover 110 can be made larger by adjusting the length or width of the long-length sheet 142a. The internal temperature rises evenly. Although the length and width of the heat-dissipating metal piece are theoretically longer, the longer the optimum length is, the longer the length of the excess metal piece needs to be higher, and the design requirements are not met. Please refer to FIGS. 2A-2D for a schematic view of a method of assembling the metal foil sheet 140 according to an embodiment. Referring to FIG. 2A, the metal foil piece 140 includes a first metal foil piece 141 and a second metal foil piece 142. The second y metal foil piece 142 is cut into a plurality of long strips 142a, and the long strips 142a are One end E1 is connected to the first metal foil 141, and the first metal foil 141 has a first surface S1 and a second surface S2. Next, a plurality of light-emitting elements 154 are disposed on the second surface S2 of the first metal foil 141, and the first surface S1 of the first metal foil 141 is attached to a heat sink 130, as shown in FIG. 2B. . Next, referring to FIG. 2C, the second end E2 of each strip 142a is outwardly developed from the periphery of the heat sink 130 and bent downward to form a radial structure. Then, in the 2D figure, the upper cover 114 is covered on the top end of the lamp cover 110, so that each long strip 142a is placed flat on the lamp 201229425

TW7153PA inside the cover 110. In this way, the waste heat generated by the light-emitting element 154 is first uniformly dispersed in the lamp cover 110 by the metal foil 140, and the inside of the lamp cover 110 is uniformly heated. Finally, the lamp cover 110 exchanges heat with the external environment, and at the same time, part of the heat is worn. The metal foil 140 is conducted to the heat sink 130, and the heat sink 130 is directly connected to the external environment for heat exchange. In the above embodiment, since the metal foil has the characteristics of being bendable and arbitrarily stretched, it is not limited by the shape in assembly, and the inside of the lamp cover can be uniformly heated to solve the problem of the local hot zone, and the metal foil is increased in heat dissipation. The heat dissipation area of the device increases the overall heat dissipation. In addition, the metal foil has the advantages of small volume, thin thickness and small thermal resistance, and is advantageous in combination with the advantages of small LED size and long life, so that metal foil is used as compared with a heat dissipating member such as a fan having a large volume and a large noise. Increased reliability and reduced lamp size. In addition, the heat sink is disposed at the joint of the lamp cover and has the function of structural support, so that the center of gravity of the lamp cover can be maintained in the axial direction of the lamp holder to make the structure of the lamp more stable. In the above, the present invention has been disclosed in the above preferred embodiments, but it is not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view showing the structure of a light-emitting diode lamp according to an embodiment. Figure 1B shows the structure of the light-emitting diode lamp of Figure 1A along 1-1 201229425.

, Schematic diagram of the TW7153PA hatching. 2A to 2D are schematic views showing a method of assembling a metal foil according to an embodiment. [Main component symbol description] 100: lamp structure 110: lamp cover 110a: accommodation space 110b: lamp cover opening portion inI in: bottom portion 112: joint 114: upper cover 116: outer casing 120: light guide plate 120a: opening portion 120b: light incident surface 122: upper surface €\124: lower surface 122a: pit (or bump) 126: light shielding sheet 130: heat sink 130a: partial heat sink 140: metal foil 141: first metal foil 142: second metal Sheet 142a: strip sheet 201229425

TW7153PA 150 : Light source 152 : Ring circuit board 152a : Inner ring surface 152b : Outer ring surface 154 : Light-emitting element 160 : Light holder 162 : Bearing D : Distance E1 : First end E2 : Second end L : Reflection path

Claims (1)

201229425 -TW7153PA ' VII. Patent application scope: 1. A lamp structure, comprising: a lamp cover having a receiving space and a lamp cover opening portion; a heat sink disposed at the opening of the lamp cover, so that a part of the heat sink is located a metal foil, comprising a first metal foil and a second metal foil, a first surface of the first metal foil being attached to the heat sink of the portion and the second metal foil The sheet extends in the receiving space; and a light source is disposed on a second surface of the first metal foil. 2. The luminaire structure of claim 1, further comprising: a light guide plate disposed in a flat shape in the accommodating space, the light guide plate having an opening corresponding to the opening of the lamp cover, the portion The heat sink passes through the opening and the opening of the lamp cover. The first metal foil is coupled to the heat sink of the portion in a surrounding manner corresponding to the opening, and the light source faces the light guide plate. 3. The luminaire structure of claim 2, wherein the second metal foil is parallel to the light guide plate and extends radially around the opening. 4. The luminaire structure of claim 2, wherein the light guide plate has a side wall of the opening as a light incident surface, the light source comprises a plurality of light emitting elements, and the light emitting elements emit light to the radiation The entrance surface. 5. The luminaire structure of claim 4, wherein the light source further comprises a ring-shaped circuit board having a pair of inner annular faces and an outer annular face, wherein the light-emitting elements are disposed on The first metal foil contacts the inner annular surface on the outer annular surface. 〇 201229425 TW7153PA - Lamp structure as described in item 1 of the lamp patent range, further comprising a bearing fixed in the lamp holder. The luminaire structure described in item 1 of the patent scope, wherein the first end is connected to the first-gold-core structure from the periphery of the radiator The luminaire structure of item 7, wherein the strip/special length extends toward the outer edge of the lampshade. The long 1·thin-like lamp structure, wherein the distances are different and different from each other, the first end to the outer edge of the lampshade includes a metal (4) method, the secret-light cover, the group Providing a first metal foil with a plurality of elongated strips attached to the first metal|^, (4)^ New; a first end of the second side; a fourth metal foil having - The first side and the * - the long side of the material, the first side of the ν white sheet is attached to a heat sink; the second end of the (4) 2 piece is bent outwardly from the periphery of the heat sink to form a radial shape Structure: as well as the cover of the cover, so that the (4) secret sheet is flat i涔