WO2014049505A1

WO2014049505A1 - Bulb

Info

Publication number: WO2014049505A1
Application number: PCT/IB2013/058744
Authority: WO
Inventors: Higmanshu Rai VAISH
Original assignee: Vaish Higmanshu Rai
Priority date: 2012-09-30
Filing date: 2013-09-22
Publication date: 2014-04-03

Abstract

The present subject matter provides a bulb and a method of manufacturing thereof. The present subject matter further provides a bulb assembly and a method of manufacturing thereof. The bulb comprises a first housing and a second housing. The first housing has a first end, a second end and a socket. A lighting element is coupled at the second end of the first housing. An adapter is coupled at the first end of the first housing. The first housing has a wall enclosing a cavity. The wall is provided with an opening. The second housing is disposed in the cavity through the opening. A power supply circuit is disposed in the second housing. The second housing configured to couple the power supply circuit and the lighting element to energize the lighting element.

Description

BULB

TECHNICAL FIELD

[001] The present subject matter generally relates to a bulb. Particularly, it relates to a bulb with light emitting diodes.

BACKGROUND

[002] Energy efficient systems, especially the ones that consume less electricity are on a high demand. Light Emitting Diode (LED) light sources consume less electricity as compared to conventional light sources. As LED light sources consume less electricity and light sources that consume less electricity are on high demand, therefore LED light sources are in demand. In addition, LEDs have longer life, compact size, high illumination and are less heat producing lighting sources as compared to the conventional lighting sources. Therefore, LED light sources are preferred over the conventional light sources. It is desirable that LED light source is made to be functional for optimum life without compromising on the safety of the consumer.

SUMMARY OF THE SUBJECT MATTER

[003] A light emitting diode bulb comprises a power supply circuit, a printed circuit board and a Light Emitting Diode (LED). The power supply circuit receives power from a power source and converts the received power in a form that is suitable to energize the LED. The life of the LED is substantially higher as compared to the life of the power supply circuit. Because of the disparity in the life of the power supply circuit and the LED of the bulb, often the bulb is left useless when any one of the power supply circuit and the LED of the bulb fails. In one instance the power supply circuit of the bulb may fail, in another instance the LED of the bulb may fail, in any one instance the bulb is rendered useless. Therefore, it is desirable that the bulb is made such that the life of the bulb is optimized.

[00 ] The present subject matter provides a solution for optimizing life of the bulb is that the power supply circuit of the bulb is made replaceable. Because the power supply circuit of the bulb is replaceable, whenever the power supply circuit fails, the power supply circuit may be replaced instead of replacing entire bulb. Similarly, in the event where the power supply circuit is still working but the LED of the bulb fails then the working power supply circuit may be used with bulb in which the LED is working.

[005] The present subject matter enables a layman or a consumer to take out the power supply circuit of the bulb without requiring any other parts of the bulb to be dismantled. The bulb of the present subject provides a second housing. The power supply circuit is disposed in the second housing. The second housing is provided with electrical nodes to connect the power supply circuit. The nodes may be plugged into an electrical socket. Further, the bulb of the subject matter is provided with a body, generally the body is a first housing and has a wall that encloses a cavity. The wall is provided with an opening through which the second housing may be inserted in the cavity. The socket establishes electrical coupling required for lighting the bulb. For example, the socket is connected to the lighting elements of the bulb and an adapter of the bulb so that when the adapter is attached to a power source, an electrical path is established between the power source and the lighting elements of the bulb through the power supply circuit to light the bulb. Providing the wall with an opening is advantageous because it makes it easy for a layman or a consumer to replace the second housing as the consumer is not required to open any other parts of the bulb. Thus a consumer or a layman does not require any specific or technical training for replacing the second housing. Further, because a layman is not required to open any other parts for example, lighting elements, or the adapter to access the power supply this ensures that these parts are protected from any damage that a set of untrained hands may cause. For the same reason, the consumer is also protected from accidental exposure to any hazard, for example electrical hazard etc. Disposing the power supply circuit in the second housing ensures that the power supply circuit is not exposed directly to a consumer. Because the power supply circuit includes a number of electrical contacts and electrical elements, restricting direct exposure of the power supply circuit and the consumer ensures that both consumer as well as the power supply circuit is protected and do not cause any damage to each other. Another advantage of disposing the power supply circuit in the second housing is that the second housing provides an additional layer of protection which protects the power supply circuit from accidental shocks or otherwise if the bulb or the second housing is accidentally dropped. The present subject matter further provides provisions to protect the power supply circuit from accidental establishment of wrong electrical connections of the power supply circuit and the bulb. The electrical contacts on the second housing and the bulb are provided such that the electrical connection is established only when the second housing is disposed in the bulb only in the manner it is intended. In case a consumer attempts to dispose the second housing in any other manner than establishment of the electrical connection is prevented because of the geometry of electrical nodes. This solution not only optimizes life of the bulb but also provides the bulb that ensures that chances of accidentally damaging the power supply circuit, LED or the consumer are reduced substantially. More details of the subject matter shall become apparent, after reading this disclosure. Thus the present subject matter provides a layman or end user to dismantle the bulb and replace or repair the failed part of the bulb.

[006] According to a first embodiment, the present subject matter provides a bulb. The bulb comprises a first housing, a second housing, a lighting element and an adapter. The first housing has a wall. The wall encloses a cavity. The first housing has a first end, a second end and a socket. The lighting element is coupled at the second end. The adapter is coupled at the first end. An opening is provided in the wall. A power supply circuit disposed in the second housing. The second housing is disposed in the cavity through the opening. The second housing is configured to couple the power supply circuit and the lighting element. According to another embodiment, the first housing is a heat sink. According to a further aspect, the first housing has a heat sink. According to a further embodiment, the second housing is a heat sink. According a further aspect, the second housing has heat sink.

[007] According to another feature of the present subject matter, the socket is configured to electrically couple a third node and the lighting element through the power supply circuit. The third node is provided in the adapter. In another embodiment, the bulb is provided with a printed circuit board. The printed circuit board is configured to be attached at the second end. The lighting element is mounted on the printed circuit board. The printed circuit board comprises a fourth node. The fourth node is electrically coupled to the socket. According to a further embodiment, the second housing is provided with a first node and a second node. The first node and the second node are coupled through the power supply circuit and the first node and the second node are electrically coupled to the socket. According to another possibility, the lighting element is a light emitting diode. According to one embodiment the socket is provided on the wall.

[008] In another embodiment any one or all of the node- the first node, the second node, the third node and fourth node may have grooves, heads, "0"-rings or a combination thereof.

[009] According to another feature of the present subject matter, the bulb is provided with a diffuser. The diffuser is attached at the second end. The diffuser covers the lighting element. The diffuser is configured to diffuse light emitted by the lighting element.

[0010] According to a further aspect of the present subject, a bulb assembly is provided. The bulb assembly comprises a second housing. The second housing is configured to be disposed in a cavity. The cavity is enclosed by a wall of a first housing of a bulb and the wall has an opening, the second housing is configured to be disposed in the cavity through the opening. The bulb assembly includes a power supply circuit disposed in the second housing. Further, the second housing is provided at least a first node and at least a second node. The first node and the second node are coupled through the power supply circuit.

[0011] According to a further aspect, the present subject matter provides a method for manufacturing a bulb. The method comprises, coupling an adapter at a first end of a first housing. The first housing has a wall and a second end. The wall encloses a cavity. The wall is provided with an opening. The method also includes coupling a lighting element at the second end of the first housing. The method further comprises disposing a second housing in the cavity through the opening. A power supply circuit is disposed in the second housing. The method provides, electrically coupling the power supply circuit and the lighting element. According to a further aspect of the method, electrically coupling includes coupling a third node and a socket. The third node is provided with the adapter and the socket is provided on the wall. The electrically coupling includes coupling a fourth node and the socket. The fourth node is provided on a printed circuit board and the lighting elements are mounted on the printed circuit board. The electrically coupling further includes coupling a first node and a second node to the socket. The first node and the second node are provided with the second housing and first node and the second node are coupled through the power supply circuit. According to a further aspect of the method, a diffuser is attached at the second end of the first housing.

[0012] According to a further aspect, the present subject matter provides a method for manufacturing a bulb assembly. The method includes providing a second housing. The second housing is configured to be disposed in a cavity through an opening of a wall. The cavity is formed in a first housing of a bulb. The wall encloses the cavity. The wall is provided with the opening. The method further provides disposing a power supply circuit in the second housing. The method also includes coupling a first node and a second node through the power supply circuit. The first node and the second node are provided with the second housing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The foregoing and other features and advantages of the present subject matter will be more clearly understood from the following detailed description and the accompanying drawings/ figures, in which:

[001 ] FIG. 1 is a sectional view of a bulb;

[0015] FIG. 2(a) shows schematic diagrams of a bulb according to an embodiment of the present subject matter;

[0016] FIG. 2(b), FIG. 2(c), FIG. 2(d) and FIG. 2(e) show more details of the bulb according to the embodiment of the present subject matter;

[0017] FIG.3 shows a cross section view of the bulb, the inset being more detailed view of a section of the bulb according to the embodiment of the present subject matter;

[0018] FIG. (a) and FIG. 4(b) show perspective views of the bulb according to the embodiment of the present subject matter;

[0019] FIG. 5 shows a block diagram of a method for manufacturing a bulb according to the present subject matter; and [0020] FIG. 6 shows a block diagram of a method for manufacturing a bulb assembly according to present subject matter.

DESCRIPTION OF THE SUBJECT MATTER

[0021] Before the present subject matter is described in further detail, it is to be understood that the subject matter is not limited to the particular embodiments described, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims. It must be noted that as used herein and in the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise.

[0022] FIG.i shows a bulb 100. FIG. 1 shows an adapter 105, an engager 107, a body 121, a power supply circuit 117, a diffuser 101, a screw 115, a light emitting diode 109 and a printed circuit board 137.

[0023] The bulb 100 is provided with the adapter 105 attached to the body 121. The engager 107 attaches the adapter 105 to a source of power supply external to the bulb 100. The bulb 100 includes the power supply circuit 117. The power supply circuit 117 is in the body 121 of the bulb 100. The power supply circuit 117 is coupled to the printed circuit board 137. The bulb 100 includes the light emitting diode 109. The light emitting diode 109 is mounted on the printed circuit board 137. The light emitting diode 109 is covered with the diffuser 101. The power supply circuit 117 is coupled to the adapter 105 and the printed circuit board 137. The printed circuit board 137 is attached to the diffuser 101 and the body 121 by means of the screw 115.

[002 ] Reference is now made to FIG. 2(a) through FIG. 2(e) collectively. In that FIG.2 (a) being a schematic diagram of a bulb 200 and FIG.2 (b), FIG.2(c), FIG. 2(d) and FIG. 2(e) show more details of the bulb 200. FIG. 2(b) shows exploded view of a diffuser assembly 207. FIG. 2(c) shows exploded view of a first housing 101. FIG. 2(d) shows exploded view of an adapter 205. FIG. 2(e) exploded view of a second housing 203. [0025] FIG. 2(a) through FIG. 2(e) show the first housing 201, a first end 211, a second end 221, a cavity 231, a socket 2 1, a wall 251, an opening 271, fin 261, threads 281 on the first housing 201, the second housing 203, a power supply circuit 273, a first node 233, a second node 283, the diffuser assembly 207, a diffuser 217, a collar 227, threads 237 on the collar 227, a printed circuit board 2 7, a lighting element 287, the adapter 205, an engager 215, a third node 225 with head 235, a fourth node 257, a clamp 277, a fastener 285, grooves 267, 2 3 and screws 291,297.

[0026] The present subject matter provides the bulb 200. The bulb 200 comprises the first housing 201, the second housing 203, the adapter 205 and the diffuser assembly 207.

[0027] The first housing 201 has the wall 251. The wall 251 encloses the cavity 231. The wall 251 is provided with the opening 271. The first housing 201 has the first end 211, the second end 221 and the socket 2 1. The first housing 201 is provided with grooves 267 at the second end 221 that may be used for mounting the printed circuit board 2 7. The grooves 267 may also be used for mounting the diffuser assembly 207 or any part thereof. In the present embodiment, the grooves 267 are used for mounting the printed circuit board 2 7. The first housing 201 is also provided with threads 281 at the second end 221. The threads 281 may be used for mounting the diffuser assembly 207. In an alternate embodiment, the threads 281 may be used for mounting collar 227 or the diffuser 217. The first housing 201 is provided with the socket 2 1. The socket 2 1 may be disposed in the cavity 231. The socket 2 1 is attached to the wall 251 using the screws 291. It may be understood by a person in the art, that the socket 2 1 may be screwed to the wall 251 or may be press fitted or otherwise fixed in the wall 251. The first housing 201 is provided with a second set of grooves (not seen in FIG. 2(a) through FIG. 2(e)) at the first end 211 for attaching the adapter 205 at the first end 211. The second set of grooves is used for hooking the fastener 285 provided with the adapter 205. More details of assembling the diffuser assembly 207, the first housing 201, the second housing 203 and the adapter 205 shall be apparent from the following discussion.

[0028] In the shown embodiment, the first housing 201 is provided with the socket 2 1 attached to the wall 251 of the first housing 201. In a further embodiment, the socket 2 1 may be provided in the cavity 231. In another embodiment, the socket 2 1 may be provided outside of the cavity 231. In a further embodiment, the first housing 201 has an internal surface. The internal surface that faces the cavity 231. The first housing 201 also has an external surface. The external surface is outside of the cavity 231. The external surface and the internal surface are the complementary surfaces of the wall 251. In one embodiment, the socket 2 1 is on the external surface of the wall 251. In another embodiment, the socket 2 1 is on the internal surface of the wall 251. In an embodiment, the socket 2 1 may have grooves 2 3 to receive an electrical connection from the second housing 203. In some other embodiments, the socket 2 1 may have heads. In one embodiment, the socket 2 1 is electrically coupled to the third node 225 and the fourth node 257. In another embodiment, the socket 2 1 is configured to electrically couple a third node 225 and the lighting element 287 through the power supply circuit 273. The third node 225 is provided with the adapter 205 and the fourth node 257 is provided with the printed circuit board 2 7.

[0029] In another embodiment, the bulb 200 is provided with the second housing 203. The second housing 203 is provided with the clamp 277. The second housing 203 is provided with the first node 233 and the second node 283. The first node 233 and the second node 283 are electrical conductor. In the shown embodiment, the first node 233 and a second node 283 are provided with a head. A power supply circuit 273 is disposed in the second housing 203. In one embodiment, the first node 233 and the second node 283 are coupled through the power supply circuit 273. In another embodiment, the first node 233 and the second node 283 are electrically coupled to the socket 2 1. The second housing 203 is configured to couple the power supply circuit 273 and the lighting element 287. The second housing 203 is disposed in the cavity 231 through the opening 271. The first housing 201 is provided with fastening arrangements on the wall 251 to fasten the second housing 203. The fastening arrangements are provided at the opening 271. The second housing 203 is engaged with the first housing 201 using the fastening arrangements and the clamp 277. The clamp 277 gets entangled with the fastening arrangement upon disposing the second housing 203 into the cavity 231. It may be understood by a person in the art, that the second housing 203 may press-fitted into the first housing 201 or using other type of engagers such as, screws, friction fit arrangement, or pull-fit arrangement. The second housing 203 gets substantially inserted in the cavity 231 and firmly fixed in the first housing 201. Upon disposing the second housing 203 in the cavity 231, the first node 233 and the second nodes 283 are mated with the socket 2 1 to electrically couple the power supply circuit 273. Also, the first node 233 and the second node 283 get electrically coupled to the socket 2 1. The socket 2 1 enables electrical coupling of the third node 225 and the fourth node 257 through the power supply circuit 273. The first node 233 is electrically coupled to the third node 225 and the fourth node 257 is electrically coupled to the second node 283.

[0030] According to another embodiment, the first housing 201 is a heat sink. According to a further embodiment, the second housing 203 is a heat sink. In yet another embodiment, both, the first housing 201 and the second housing 203 are the heat sink. In one embodiment, the first housing 201 and the second housing 203 are in thermally coupled. Thermally coupling the first housing 201 and second housing 203 may improve heat sinking capacity. In the shown embodiment, the heat sink provided with the fin 261. The fin 261 improves the heat sinking capacity. The heat sink is used for sinking heat generated by the bulb. According to yet another possibility, the heat sink may be provided with fins 261 comprising of pin fins, straight fins, cross cut fins, flared fins and combinations thereof. The first housing 201 or the second housing 203 or both may have cylindrical, cubical, hexagonal, any other regular or irregular shape. The wall 251 surrounds the cavity 231 to form a hollow enclosure. In one embodiment, any one or both of the first housing 201 and the second housing 203 is made of an electrically non-conductive material. The non-conductive materials may include, but not limited to, the ceramics, composite materials, glass, plastic, carbon fiber etc. In another embodiment, any one or both of the first housing 201 and the second housing 203 may be made of heat conductive materials. The heat conductive materials may include, but not limited to, metal alloys, aluminum, copper, iron, stainless steel etc.

[0031] In another embodiment, the bulb 200 is provided with a printed circuit board 2 7. The printed circuit board 2 7 is configured to be attached at the second end 221. In an embodiment, the printed circuit board 2 7 is clamped in the diffuser assembly 207. The printed circuit board 2 7 may be clamped in the diffuser assembly 207. It shall become clear, after reading this specification, that in some embodiments, the printed circuit board 2 7 may be directly screwed or press fitted at the second end 211 and the diffuser assembly 207 or the diffuser 217 may be attached at the second end 211 on the printed circuit board 247. The printed circuit board 2 7 is provided with the fourth node 257. The fourth node 257 is configured to be coupled to the socket 2 1. The fourth node 257 is electrically coupled to the second node 283 through the socket 2 1 when the second housing 203 is disposed in the cavity 231. I n an embodiment, the printed circuit board 2 7 is provided with the lighting element 287. The lighting element 287 is mounted on the printed circuit board 2 7. The lighting element 287 is electrically coupled to the printed circuit board 2 7. According to an embodiment, the lighting element 287 is a light emitting diode. According to a further embodiment, the printed circuit board 2 7 is made up of a non-conductive material like, but not limited to, plastic, glass-fiber and resin composites with the use of copper traces. An electrical circuit may be etched on the printed circuit board 2 7. The printed circuit board 2 7 may have multiple layers of the electrical circuit. The printed circuit board 2 7 is used to mechanically support the lighting element 287. The lighting element 287 may be integrated into the electrical circuit of the printed circuit board 2 7.

[0032] The bulb 200 is provided with the diffuser 217. The diffuser 217 is mounted on the second end 221. I n one embodiment, the diffuser 217 is a part of the diffuser assembly 207. In another embodiment, the diffuser assembly 207 comprises the diffuser 217, the collar 227 and the printed circuit board 2 7. The diffuser assembly 207 is mounted at the second end 221 of the bulb 200. The diffuser 217 is mounted on the collar 227. The collar 227 is mounted on the second end 221. The collar 227 also mounts the printed circuit board 2 7 on the second end 211 with the help of screws 297. In some embodiments, the collar 227 may have threads 237. The diffuser 217 may be mounted on the second end 221 of the first housing 201 with the help of the collar 227 and the threads 237. The first housing 201 is provided with another threads 281 at the second end 221 to screw the diffuser assembly 207 at the second end 221. The diffuser 217 is a device that diffuses or spreads out or scatters light emitted by the lighting element 287. In some embodiments, the diffuser 217 may include a reflector. The reflector is configured to reflect the light emitted by the lighting device. The diffuser 217 may use translucent objects, and may include, but not limited to, ground glass diffusers, teflon diffusers, holographic diffusers, opal glass diffusers, and grey glass, polycarbonate, acrylic ultraviolet light resistant, opal and satin color fall etc. [0033] The third node 225, the first node 233, the second node 283, fourth node 257 and socket 2 1 are configured to electrically couple the lighting element 287 and a power source through the power supply circuit 273 to establish the current path. The first node 233 and the second node 283 are electrically coupled through the power supply circuit 273 and the third node 225 is electrically coupled to the power supply circuit 273 through the first node 233 and the socket 2 1. Further the fourth node 257 of the printed circuit board 2 7 is electrically coupled to the lighting element 287. The fourth node 257 is configured to be electrically coupled to the second node 283 and the socket 2 1.

[003 ] The first housing 201 is provided with the adapter 205. The adapter 205 is attached to the first end 211. The adapter 205 is provided with the fastener 285. The fastener 285 fastens the first housing 201 and the adapter 205. In the shown embodiment, the fastener 285 is a groove. The first housing 201 is provided with the complementary hook or groove to receive the adapter 205.

[0035] The adapter 205 is further provided with the third node 225. In an embodiment, the third node 225 is provided with the head 235. The third node 225 is an electrical conductor. The electrical conductor pierces through the adapter 205 such that one end of the electrical conductor is disposed outside of the adapter 205 and is configured to be coupled to a power source. The power source is external to the bulb 200 and is not shown in FIG. 2. The adapter 205 is provided with the engager 215. The adapter 205 is provided with the engager 215. The engager 215 engages the power source and the adapter 205. The engager 215 is a bayonet cap type engager. To engage the adapter 205 to the power source using the bayonet cap type engager, the bulb 200 is pushed and twisted. In another embodiment, the engager 215 is an Edison screw type engager. To engage the adapter 205 using Edison screw type engager 215, the bulb 200 is screwed to engage the adapter 205 and the power source. A person skilled in the art shall appreciate that the present subject may be practiced, made and sold without the power source. The engager 215 engages the power source and the adapter 205 such that the third node 225 is in electrical contact with the power source through the head 235. The power supply circuit 273 receives power from the power source from the third node 225 through the first node 233. The power supply circuit 273 provides the output at the second node 283. It would further become apparent to a person skilled in the art, after reading this specification that other configurations of the engager 215 and the adapter 205 are possible that enable engaging of the power source and adapter 205.

[0036] It would become apparent to a person skilled in the art, after reading this specification, that the first node 233, the second node 283, the third node 225, the fourth node 257, and socket 2 1 each may have more than one electrical contact points. In another possibility, any one or more of the first node 233, second node 283 the third node 225 and the fourth node 257 may be a head, a hole, an O-ring, a groove, an electric socket, any other electrical node or a combination thereof. To prevent incorrect connection of nodes the socket 2 1 may be keyed. The keying is a mechanical feature provided with any one or more of the socket 2 1, the first node 233, the second node 283, the third node 225 and the fourth node 257. Keying couples the socket 2 1 to any one or more of the first node 233, the second node 283, the third node 225 and the fourth node 257 only when respective node (that is, any one or more of the first node 233, the second node 283, the third node 225 and the fourth node 257) is correctly oriented. It would become apparent to a person skilled in the art, after reading this specification, that other examples of the socket 2 1, the first node 233, the second node 283, the third node 225 and the fourth node 257 are possible.

[0037] The power supply circuit 273 receives power from the power source through the third node 225 and the first node 233. The power supply circuit 273 converts the received power into a form suitable to energize the lighting element 287. In one embodiment, the power supply circuit 273 is a rectifier. The rectifier yields a unidirectional but pulsating direct current, that is, the rectifier receives alternating current and converts the alternating current into direct current. In another embodiment, the power supply circuit 273 is a half wave rectifier. In a further embodiment, the power supply circuit 273 is a full- wave rectifier. In some embodiments, the power supply circuit 273 includes a voltage converter. In some embodiments, the voltage converter converts high voltage to low voltage. In some other embodiments, the voltage converter converts low voltage to high voltage. In some embodiments, the power supply circuit 273 is a DC to DC converter and in some other embodiment, the power supply circuit 273 is an AC to AC converter. In some embodiments, the power supply circuit 273 is an AC to DC converter and in some other embodiment, the power supply circuit 273 is a DC to AC converter. In an embodiment, the power supply circuit 273 includes a power factor circuit. The power supply circuit 273 provides the output at the second node 283. The third node 225 is electrically coupled to the first node 233. The first node 233 is electrically coupled to the second node 283 through the power supply circuit. The second node 283 is electrically coupled to the fourth node 257. Because the lighting element 287 is in electrical contact with the fourth node 257, a current path is established between the lighting element 287 and the power source. The lighting element 287 receives the output power of the power supply circuit 273 and gets energized, when the bulb 200 is engaged to the power source through the adapter 205. The power source is external to the bulb 200.

[0038] FIG. 3 is the schematic cross sectional view of the bulb 200 and a more detailed view of a part of the bulb 200. FIG.3 shows the second housing 203, the wall 251, the cavity 231, a clip 3 3, a groove 377, a protrusion 391, the clamp 277.

[0039] The cross-sectional view shows disposing of the second housing 203 in the cavity 231 in more details. To dispose the second housing 203 in the cavity 231, the clip 3 3 may be depressed and the second housing 203 is inserted into the cavity 231. After inserting the second housing 203 into the cavity 231, the clip 3 3 may be released. Upon releasing the clip 3 3 settles itself in the groove 377 and pushes the second housing 203 against the wall 251. This push causes the clamp 277 to get entangled with the protrusion 391. According to one possibility, the clip 3 3, the groove 377, the protrusion 391 and the clamp 277 together forms the fastening arrangements.

[00 0] FIG. ^ (a) and FIG. (b) show perspective views of a bulb 200 according to an embodiment of the present subject matter. FIG. (a) and FIG. (b) show the first housing 201, the socket 2 1, fins 63, the opening 271, the second housing 203, the cavity 231, the groove 2 3, and surface area 451 of the second housing 203.

[00 1] FIG. ^ (a) and FIG. (b) show perspective views of the bulb 200. While FIG. (a) shows a view the bulb 200 in which the second housing 203 is disposed in the first housing 201, the FIG. 4(b) shows another view of the bulb in which the second housing 203 is taken out from the first housing 201. The FIG. (b) provides an inside view of the first housing 201 through the opening 271. The socket 241, the groove 243 and the cavity 231 are visible through the opening 271. In one embodiment, surface area 451 of the second housing 203 which acts as a heat sink is also visible. The heat sink is provided with fins 463.

[00 2] Reference is now made to the FIG. 2, FIG. 3 FIG. 4(a) and FIG. 4(b) collectively. The bulb 200 is assembled by attaching the adapter 205 and the diffuser assembly 207 to the first housing 201 and coupling third node 225 of adapter 205 and the fourth node 257 of the printed circuit board 2 7 to the socket 2 1. Because, the bulb 200 is provided with a geometry that would not require, any one or both of, the adapter 205 and the diffuser assembly 207 to be detached from the first housing 201 for replacing the power supply circuit 273, the adapter 205 and the diffuser assembly 207 may be attached to the first housing 201 permanently or in a manner that the adapter 205 and the first housing 201 are not easily detachable by an end user/layman or consumer of the bulb 200. In an embodiment, the adapter 205 and/ or the diffuser assembly 207 are attached to the first housing 201 are attached so that the attachment is openable in a factory or a repair shop setting. In one possibility, any one or more of the adapter 205 and the diffuser assembly 207 may be glued or attached using a fastener to the first housing 201. Restricting detachment of the adapter 205, the diffuser assembly 207 or any parts thereof and the first housing 201 reduces possibility of damaging the bulb 200 and other parts thereof. However, it shall become clear to a person skilled the art that the present subject matter may be practiced without providing attachment openable in a factory or repair shop setting. In a further possibility, any one or both of the adapter 205 and the diffuser assembly 207 or any part thereof, and the first housing 201 are press-fitted. In another possibility, the adapter 205 and the diffuser assembly 207 or any part thereof, are provided with threads and the first housing 201 is provided with complimentary threads for attaching the adapter 205 and/or the diffuser 207. In a further possibility, any one or both of the adapter 205 and the diffuser assembly 207 or any part thereof, and the first housing 201 are clamped. In yet another possibility, any one or both of the adapter 205 and the diffuser assembly 207 or any parts thereof are provided with hooks and the first housing 201 is provided with a groove and the hooks and the groove are entangled. A person skilled in the art, after reading this specification, shall understand that a combination of threads, hook, groove, clamp, press-fitting etc. may be provided with any one or more of the adapter 205, the difffuser assembly 207 and the first housing 201. [00 3] The second housing 203 is assembled by disposing the power supply circuit 273 in the second housing 203 and coupling the first node 233 and the second node 283 through the power supply circuit 273. The power supply circuit 273 may be boxed so that a consumer or a layman does not access or exposed to the power supply circuit 273. This ensures that the consumer and the power supply circuit both are protected. Further the second housing 203 may be configured such that it may be openable at a factory setting or repair shop. The bulb 200 is further assembled by disposing the second housing 203 into the cavity 231 through the opening 271. Disposing of the second housing 203 into the cavity 231 may be carried out at a factory setting or by an end user/layman or a consumer of the bulb 200. Providing options for removably disposing the second housing into the cavity ensures that the second housing may be interchangeably used with different bulbs. When the second housing 203 is disposed in the cavity 231, the third node 225, the first node 233, the second node 283, the fourth node 257 and socket 2 1 gets coupled, effectively establishing a current path from a power source to the lighting element 287 through the power supply circuit 273.

[00 ] According to another aspect, the present subject matter also provides a bulb assembly. The bulb assembly is the second housing 203. The power supply circuit 273 is disposed in the second housing 203. Further, electrical connection is established between the first node 233 and second node 283 through the power supply circuit 273. The bulb assembly is configured to be disposed into the cavity 231 of the first housing 201 as discussed above.

[00 5] FIG.5 shows a block diagram 500 of a method for manufacturing bulb according to the present subject matter. According to the method 500, at block 501 an adapter is coupled at a k of a first housing. The first housing has a wall and a second end. The wall encloses a cavity. Further, the wall is provided with an opening. At block 503, a lighting element is coupled at the second end of the first housing. At block 505, a second housing is disposed in the cavity through the opening. The step also comprises disposing a power supply circuit in the second housing. At block 507, the power supply circuit and the lighting element are electrically coupled. At block 509, a diffuser is attached at the second end of the first housing. According to another aspect of method 500, the block 507 further includes a block 517, at block 517 a third node is coupled with a socket. The third node is provided with the adapter and the socket is provided on the wall. According to a further aspect of method 500, the block 507 further includes a block 527, at block 527 a fourth node is coupled with the socket. The fourth node is provided on a printed circuit board. The lighting element is mounted on the printed circuit board. According to a further aspect of method 500, the blocks 517 and 527 further include a block 537, at block 537 a first node and a second node is couple to the socket. The first node and the second node are provided with second housing. The step includes coupling of the first node and second node through the power supply circuit.

[00 6] FIG.6 shows a block diagram 600 of a method for manufacturing a bulb assembly according to present subject matter. According to the method 6oo, at block 601 a second housing is provided. The second housing is configured to be disposed in a cavity through an opening of a wall. The cavity is formed in a first housing of a bulb. The wall encloses the cavity. The wall is provided with the opening. At block 603, a power supply circuit is disposed in the second housing. At block 605, a first node is coupled with a second node through the power supply circuit. The first node and the second node are provided with the second housing.

[00 7] While the subject matter may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described herein. Alternate embodiments or modifications may be practiced without departing from the spirit of the present subject matter. The drawings shown are schematic drawings and may not be to the scale. While the drawings show some features of the subject matter, some features may be omitted. Alternatively, in some other cases some features may be emphasized while others are not. Further, the methods disclosed herein may be performed in manner and/or order in which the methods are explained. Alternatively, the methods may be performed in manner or order different than what is explained without departing from the spirit of the present subject matter. It should be understood that the subject matter is not intended to be limited to the particular forms disclosed. Rather, the subject matter is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the following appended claims.

Claims

What is claimed is:

1. A bulb comprising: a first housing having a wall, the wall encloses a cavity and the first housing has a first end, a second end and a socket; a lighting element coupled at the second end; an adapter coupled at the first end; an opening provided in the wall; and a power supply circuit disposed in a second housing, the second housing is disposed in the cavity through the opening and the second housing configured to couple the power supply circuit and the lighting element.

2. The bulb of claim 1, wherein the socket is configured to electrically couple a third node and the lighting element through the power supply circuit, wherein the third node is provided in the adapter.

3. The bulb of claim 1, wherein the bulb is provided with a printed circuit board, the printed circuit board is configured to be attached at the second end and the lighting element is mounted on the printed circuit board, the printed circuit board comprises a fourth node, the fourth node is electrically coupled to the socket. it. The bulb of claim 1, wherein the second housing is provided with a first node and a second node, wherein the first node and the second node are coupled through the power supply circuit and the first node and the second node are electrically coupled to the socket.

5. The bulb of claim 1, wherein the socket is provided on the wall.

6. The bulb of claim 1, wherein the lighting element is a light emitting diode.

7. The bulb of claim 1, wherein the first housing is a heat sink.

8. The bulb of claim 1, wherein the second housing is a heat sink.

9. The bulb of claim 1, wherein a diffuser is attached at the second end.

10. A bulb assembly comprising: a second housing configured to be disposed in a cavity, wherein the cavity is enclosed by a wall of a first housing of a bulb and the wall has an opening, the second housing is configured to be disposed in the cavity through the opening; and a power supply circuit is disposed in the second housing.

11. The bulb assembly of claim 10, wherein the second housing is provided at least a first node and at least a second node, wherein the first node and the second node are coupled through the power supply circuit.

12. A method of manufacturing a bulb comprising: coupling an adapter at a first end of a first housing, wherein the first housing has a wall and a second end, the wall encloses a cavity and the wall is provided with an opening; coupling a lighting element at the second end of the first housing; disposing a second housing in the cavity through the opening, wherein a power supply circuit disposed is in the second housing; and electrically coupling the power supply circuit and the lighting element.

13. A method of claim 12, wherein electrically coupling includes: coupling a third node and a socket, wherein the third node is provided with the adapter and the socket is provided on the wall; and coupling a fourth node and the socket, wherein the fourth node is provided on a printed circuit board and the lighting element is mounted on the printed circuit board.

14. A method of claim 13, wherein electrically coupling includes coupling a first node and a second node to the socket, wherein the first node and the second node are provided with second housing and first node and second node are coupled through the power supply circuit.

15. A method of claim 12, wherein the method comprise attaching a diffuser at the second end of the first housing.

16. A method of manufacturing a bulb assembly comprising: providing a second housing, the second housing is configured to be disposed in a cavity through an opening of a wall, wherein the cavity is formed in a first housing of a bulb, the wall encloses the cavity and the wall is provided with the opening; and disposing a power supply circuit in the second housing.

17. The method of claim 16, wherein the method comprises: coupling a first node and a second node through the power supply circuit, wherein the first node and the second node are provided with the second housing.