WO2014049508A2

WO2014049508A2 - Bulb

Info

Publication number: WO2014049508A2
Application number: PCT/IB2013/058747
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
Also published as: WO2014049508A3

Abstract

Bulb 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, a second housing, a power supply circuit and a lighting element. The first housing comprises a first end, a second end and a cavity. Further a second housing having an adapter and a body attached to the adapter is provided. A power supply circuit is disposed in the body. The bulb also comprises a printed circuit board mounted at the second end and a lighting element mounted on the printed circuit board. The second housing is removably disposed at least partially in the cavity and the first housing is configured to couple the power supply circuit and the lighting element.

Description

BULB

TECHNICAL FIELD

[001] The present subject matter relates to a bulb. In particular, the subject matter relates to a bulb having Light Emitting Diodes (LED).

BACKGROUND OF THE SUBJECT MATTER

[002] The drive for finding better ways of saving power and living green is replacing conventional incandescent bulbs with light emitting diode (LED) bulbs. The conventional bulbs suffer from the disadvantages like high power consumption, high temperature and short life time. On the other end, the LED bulbs have a longer life, consume less power and produce no waste and hence are eco-friendly.

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 energise the LEDs. The life of the LED is substantially longer 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 of these instances 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. The present subject matter provides a replaceable power supply circuit with the bulb. 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 a bulb fails, the working power supply circuit may be used with the bulb in which the LED is working. [005] The present subject matter provides a layman or a consumer an access to the power supply circuit upon dismantling the bulb. Further, instead of directly disposing the power supply circuit in the bulb, the present subject matter provides the power supply circuit disposed in a separate enclosure or housing (say, a second housing). The second housing is disposed in the bulb. Disposing the power supply circuit in the second housing ensures that the power supply circuit is not exposed directly to a consumer when the consumer dismantles the bulb. 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 the 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 if the bulb or the second housing is accidentally dropped or from any other accidental shock.

[006] According to an aspect, the present subject matter provides a bulb. The bulb comprises a first housing. The first housing is provided with a second end, a first end and a cavity. The first housing is a hollow enclosure that defines the cavity between the second end and the first end. In an embodiment of the present subject matter, the first housing is a heat sink. According to an aspect, the first housing may have a heat sink. According to another aspect, the present subject matter provides a second housing. According to one aspect the second housing is a heat sink. According to a further aspect, the second housing may have a heat sink. The second housing has an adapter and a body attached to the adapter. A power supply circuit is provided with the second housing. In one embodiment, the power supply circuit is disposed in the second housing. In another embodiment, the power supply circuit is disposed in the body. The body is substantially cylindrical. The body is configured to be disposed into the cavity through the first end. In one possibility, the power supply circuit is disposed in the body. According to another embodiment, any one or both of the first housing and the second housing is a heat sink.

[007] According to a further aspect, a printed circuit board is mounted at the second end. The present subject matter further provides a lighting element mounted on the printed circuit board. In one embodiment, the lighting element is a light emitting diode. [008] According a further aspect of the present subject matter, the second housing is removably disposed at least partially in the cavity and the second housing is configured to couple the power supply circuit and the lighting element. The second housing is configured to establish a current path through the power supply circuit to energise the lighting element. The second housing according to one embodiment is configured to be disposed into the cavity through the first end. According to another embodiment, the body is configured to be disposed into the cavity through the first end.

[009] In one possibility, the second housing is provided with a first node. The first node is electrically coupled to the power supply circuit. In another possibility, the first node is provided on the body. According to another possibility, a third node may be provided with the second housing. According to a possibility, the adapter comprises a third node. The third node is coupled to the power supply circuit. The third node is configured to electrically couple the lighting element and a power source through the power supply circuit to establish the current path. According to another feature of the present subject matter, a second node may be provided. According to a possibility, the second node may be provided with the printed circuit board. The second node is electrically coupled to the lighting element. The first node and the second node are coupled to establish the current path.

[0010] According to another possibility, the second housing has an external wall and the first node is provided on the external wall. According to a further possibility, the first housing has an internal wall and the second node is provided on the internal wall. The second node is electrically coupled to the lighting element. In one possibility, the second node may be coupled to the lighting element through the printed circuit board. The first node is configured to be coupled to the second node. The first node and the second are coupled to establish the current path. .

[0011] In one possibility, the bulb is provided with a spring. The spring is disposed in the cavity. The spring is configured to snug fit the second housing in the cavity. [0012] 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.

[0013] According to another aspect, the present subject matter provides a bulb assembly. The bulb assembly comprises a second housing. The second housing comprises an adapter and a body attached to the adapter and a power supply circuit is disposed in the body. The second housing is configured to be removably disposed at least partially in a cavity. The cavity is formed in a first housing of a bulb. According to a feature of the bulb assembly, the body is substantially cylindrical. According to another feature, the body is configured to be inserted into the cavity through a first end of the first housing. According to a further aspect of the bulb assembly, the second housing is provided a first node. The first node is electrically coupled to the power supply circuit. According to one possibility, the first node is provided with a spring. The first node is configured to couple the power supply circuit and a lighting element. The first node is configured to establish a current path through the power supply circuit to energise the lighting element. The lighting element is mounted on a printed circuit board and the printed circuit board is attached to a second end of the first housing. The adapter is further provided with a third node. The third node is coupled to the power supply circuit. The third node is configured to establish the current path through the power supply circuit. The third node is configured to electrically couple the lighting element and the power source through the power supply circuit and the third node is configured to establish a current path through the power supply circuit to energise the lighting element. In one embodiment, the body has an external wall and the first node is provided on the external wall. In some embodiment, the second node is provided on an internal wall of the first housing.

[001 ] According to another aspect, the subject matter provides a method of manufacturing a bulb. The method comprises mounting a printed circuit board at a second end of a first housing. A lighting element is mounted on the printed circuit board. The first housing has a first end, and a cavity is defined in the first housing between the second end, the first end and the printed circuit board. The method includes disposing removably a second housing at least partially in the cavity through the first end. The second housing comprises an adapter and a body attached to the adapter. A power supply circuit is disposed in the body. The method includes coupling the power supply circuit and the lighting element. In one embodiment a current path is established through the power supply circuits to energise the lighting element. According to a further aspect, the method includes disposing a spring in the cavity to snug fit the second housing in the cavity. According to another aspect, mounting the printed circuit board includes attaching a diffuser at the second end to cover the lighting element and the d iffuser is configured to diffuse light emitted by the lighting element.

[0015] According a further aspect, the present subject matter provides a method for manufacturing a bulb assembly. The method comprises providing a second housing. The second housing comprises an adapter and a body. The method comprises d isposing a power supply circuit in the body. The method includes attaching the adapter and the body. The second housing is configured to removably dispose at least partially in a cavity. The cavity is formed in a first housing of a bulb. According to an aspect, disposing comprises coupling the power supply circuit to a first node and to a third node wherein the first node and the third node are coupled through the power supply circuit. The coupling of first node and the third node establishes a current path from the third node to the first node through the power supply circuit. The third node is provided with the adapter. The method of providing second housing comprises providing a spring. The spring is configu red to snug fit the second housing in the cavity.

BRIEF DESCRIPTION OF THE SUBJECT MATTER

[0016] The subject matter shall now be described with reference to the accompanying figures, wherein:

[0017] FIG.i is a sectional view of a bulb;

[0018] FIG. 2(a) shows schematic diagrams of a bulb according to an embodiment of the present subject matter;

[0019] 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 su bject matter; [0020] FIG.3 (a) and FIG. 3(b) shows a bulb according to a further embodiment of the present subject matter, FIG. 3(a) being a cross section view, and FIG. 3(b) more details of the bulb.

[0021] FIG. (a) through FIG. (d) show schematic diagrams of a bulb according to another embodiment of the present subject matter, FIG. (a) being exploded view and FIG. 4(b) being a cross-sectional view, FIG. (c), and FIG. (d) show more details of the bulb;

[0022] FIG.5 shows a block diagram for a method of manufacturing a bulb according to the present subject matter; and

[0023] FIG.6 shows a block diagram for a method of manufacturing a bulb assembly according to the present subject matter.

DETAILED DESCRIPTION OF THE SUBJECT MATTER

[0024] 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.

[0025] FIG. 1 shows a bulb 100. The bulb 100 has 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.

[0026] 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 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 loi. 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 a screw 115.

[0027] Reference is now made to FIG. 2(a) through FIG. 2(e) collectively. In that FIG.2 (a) being exploded view and FIG 2(e) being a cross-sectional view of a bulb 200 and FIG.2 (b), FIG.2(c) and FIG. 2(d) show more details of the bulb 200.

[0028] FIG. 2(a) through FIG. 2(e) show a first housing 201, a second end 211, a first end 221, a cavity 231, fins 2 1, grooves 251, 281, threads 261 at the first housing 201, a second housing 203, a body 213, an adapter 223, an engager 293, a first node 233, a third node 263, a power supply circuit 2 3, a diffuser assembly 205, a diffuser 215, a collar 225, threads 235 on the collar 225, a printed circuit board 2 5, a lighting element 285, a second node 265, fasteners 273, 283 and 253, and screws 255.

[0029] The present subject matter provides the bulb 200. The bulb 200 comprises the first housing 201, the second housing 203, and the diffuser assembly 205.

[0030] The first housing 201 has the second end 211, the first end 221 and the cavity 231. The first housing 201 is a heat sink and is provided with the fins 2 1. The first housing 201 is provided with grooves 251 that may be used for mounting the printed circuit board 2 5. Or the grooves 251 may be used for mounting the diffuser assembly 205 or any part thereof. In the present embodiment, the grooves 251 are used for mounting the printed circuit board 2 5. The first housing 201 is also provided with threads 261. The threads 261 are used for mounting the diffuser assembly 205. The first housing 201 is provided with a second set of grooves 281 at the first end 221. The second set of grooves is used for hooking the fastener 283 provided with the second housing 203, when the second housing 203 is disposed in the first housing 201. More details of assembling the diffuser assembly 205, the first housing 201 and the second housing 203 shall be apparent from the following discussion.

[0031] The second housing 203 has the adapter 223 and the body 213. The adapter 223 is attached to the body 213. The body 213 is substantially cylindrical. However, a person skilled in the art, after reading this specification, shall appreciate that the body 213 may be columnar without regard to the shape of the body 213 being cylindrical. The body 213 may be a rectangular, a square column or of any other regular or irregular shape. The body 213 is provided with the first node 233. In the shown embodiment, the first node 233 has an O-ring and a head. The second housing 203 is further provided with fastener 273, 283 and 253. The fastener 253 and 273 fasten the body 213 and the adapter 223. The fastener 253 is provided with the body 213 and is a hook. The fastener 273 is provided with the adapter 223 and is a groove. The hook 253 is inserted into the groove 273 and the body 213 and the adapter 223 are twisted in different directions to fasten the body 213 and the adapter 223. Similarly, the adapter 223 is provided with the fastener 283. The fastener 283 is a hook. The fastener 283 is used for hooking the second housing 203 with the first housing 201. The second housing 203 is disposed in the cavity 231 for hooking the fastener 283 with the groove 281 of the first housing 201. The power supply circuit 2 3 is disposed in the second housing 203. The power supply circuit 2 3 is disposed in the body 213. The adapter 223 is further provided with the third node 263. The third node 263 is provided with the adapter 223. The third node 263 is an electrical conductor. The electrical conductor pierces through the adapter 223 such that one end of the electrical conductor is disposed outside of the adapter 223 and is configured to be coupled to a power source. The power source is external to the bulb 200 and is not shown in the figure. The second housing 203 is provided with the engager 293. In another embodiment, the adapter 223 is provided with the engager 293. The engager 293 engages the power source and the adapter 223. The engager 293 is a bayonet cap type engager. To engage the adapter 223 to the power source using the bayonet cap type engager, the bulb 200 is pushed and twisted. The engager 293 engages the power source and the adapter 223 such that the third node 263 is in electrical contact with the power source. The power supply circuit 2 3 receives power from the power source through the third node 263. The power supply circuit 2 3 provides the output to the first node 233.

[0032] 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. The heat sink may be provided with fins 2 1. The fins 2 1 improve the heat sinking capacity. The heat sink is used for sinking heat generated by the bulb 200. According to yet another possibility, the heat sink may be provided with fins 2 1 comprising of pin fins, straight fins, cross cut fins, flared fins and a combination thereof.

[0033] The bulb 200 is further provided with the diffuser assembly 205. The diffuser assembly 205 includes the diffuser 215. The diffuser assembly 205 is provided with the collar 225. The collar 225 has threads 235. The diffuser 215 is attached to the second end 211 of the first housing 201 with the help of the collar 225 and the threads 235. The first housing 201 is provided with a complementary set of threads 261 at the second end 211 to screw the diffuser assembly 205 at the second end 211.

[003 ] Although in this embodiment, the diffuser assembly 205 is provided with the collar 225 and threads 235, it shall become clear, after reading this specification, that in some embodiments, the diffuser assembly 205 may be press fitted at the second end 211. The diffuser assembly 205 is further provided with the printed circuit board 2 5 clamped in the diffuser assembly 205. The printed circuit board 2 5 may be clamped in the diffuser assembly 205 using clamps. In this embodiment, the printed circuit board 2 5 is screwed at the second end 211 using the screws 255. It shall become clear, after reading this specification, that in some embodiments, the printed circuit board 2 5 may be directly screwed or press fitted at the second end 211 and the diffuser assembly 205 or the diffuser 215 may be attached at the second end 211 on the printed circuit board 2 5. According to another possibility, the printed circuit board 2 5 may be press-fitted or screwed, glued or otherwise fastened in the diffuser assembly 205. The printed circuit board 2 5 includes the second node 265. The second node 265 is a set of a hole and an O-ring (not seen in FIG.2). The second node 265 is configured to be coupled to the first node 233. Upon mounting the diffuser assembly 205 at the second end 211, the second node 265 comes in electrical contact with the first node 233 such that, the head of the first node 233 gets inserted in the hole 265. The lighting element 285 is mounted on the printed circuit board 2 5. The lighting element 285 is a light emitting diode. The lighting element 285 is in electrical contact with the second node 265 and receives electrical energy through the second node 265. The diffuser 215, when mounted on the collar 225 encompasses the lighting element 285. The diffuser 215 is configured to diffuse, spread out or scatter light emitted by the lighting element 285 when the lighting element 285 is energised. The printed circuit board 245 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 5. The printed circuit board 2 5 may have multiple layers of the electrical circuit. The printed circuit board 2 5 is used to mechanically support the lighting element 285. The lighting element 285 may be integrated into the electrical circuit of the printed circuit board 2 5. In some embodiments, the diffuser 215 may include a reflector for reflecting light. The diffuser 215 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. In one embodiment, the diffuser assembly 205 and any attachments thereof are water and dust resistant.

[0035] The power supply circuit 2 3 receives power from the power source through the third node 263 and converts it into a form suitable to energise the lighting element 285. I n one embodiment, the power supply circuit 2 3 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. I n another embodiment, the power supply circuit 2 3 is a half wave rectifier. I n a further embodiment, the power supply circuit 243 is a full-wave rectifier. I n some embodiments, the power supply circuit 2 3 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 2 3 is a DC to DC converter and in some other embodiment, the power supply circuit 2 3 is an AC to AC converter. In some embodiments, the power supply circuit 2 3 is an AC to DC converter and in some other embodiment, the power supply circuit 2 3 is a DC to AC converter. In an embodiment, the power supply circuit 2 3 includes a power factor circuit. The power supply circuit 2 3 provides the output at the first node 233. Because the second node 265 is in electrical contact with the first node 233 and the lighting element 285 is in electrical contact with the second node 265, a current path is established between the lighting element 285 and the power source. The lighting element 285 receives the output power of the power supply circuit 2 3 and gets energised when the bulb 200 is engaged to the power source through the adapter 223. The power source is external to the bulb 200 and is not shown in the FIG.2.

[0036] An assembled bulb 200 is shown in the schematic cross sectional view of the bulb 200. The bulb 200 has the diffuser 215 attached to the second end 211 of the first housing 201. The diffuser 215 is attached to the second end 211 using the collar 225. The diffuser assembly 205 includes the printed circuit board 2 5. One or more lighting elements 285 are mounted on the printed circuit board 2 5. The printed circuit board 2 5 is provided with the second node 265. The second node 265 is coupled to the first node 233. The power supply circuit 2 3 is disposed in the second housing 203. The third node 263, the first node 233 and the second node 265 are electrically coupled through the power supply circuit 2 3. The body 213 is disposed in the cavity 231. The cavity 231 is in the first housing 201. The body 213 is coupled to the adapter 223. The adapter 223 has the third node 263. The third node 263 is coupled to the first node 233. The third node 263 is also configured to be coupled to the power supply circuit 2 3 and the power source. The power source is external to the bulb 200 and is not shown in FIG.2. The adapter 223 has the engager 293. The first housing 201 is a heat sink and is provided with the fins 2 1. The printed circuit board 2 5 is attached to the second end 211 through the screw 255.

[0037] The bulb 200 is assembled by attaching the adapter 223 and the body 213. The power supply circuit 2 3 is disposed in the body 213. The first node 233 and the third node 263 are coupled to the power supply circuit 2 3. The adapter 223 is generally attached to the body 213 in factory setting. Because, the bulb 200 is provided with a geometry that would not require the adapter 223 to be detached from the body 213 for replacing the power supply circuit 2 3, the adapter 223 may be attached to the body 213 permanently or in a manner that the adapter 223 and the body 213 are not easily detachable by an end user/layman or consumer of the bulb 200. That is, the adapter 223 and the body 213 are detachable only in a factory setting or in a repair shop. Restricting detachment of the adapter 223 and the body 213 reduces possibility of damaging the bulb 200 and the power supply circuit 2 3. In one possibility, the adapter 223 may be glued to the body 213. Glue or any other fastener for attaching the adapter 223 to the body 213 is selected so that detaching of the adapter 223 from the body 213 may be carried out only in a factory setting. However, it shall become clear to a person skilled the art that for practicing the present subject providing the adapter 223 and the body 213 openable in a factory or repair shop setting is not an essential requirement. The second housing 203 is disposed in the cavity 231. The body 213 of the second housing 203 is inserted into the cavity 231 of the first housing 201 through the first end 221. Disposing 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. The diffuser assembly 205 is mounted on the second end 211 using the threads 261, 235 and the screws 255. Mounting the diffuser assembly 205 mou nts the diffuser 215, the printed circuit board 2 5 and the lighting element 285 mou nted over the printed circuit board 2 5. Because, the bulb 200 is provided with a geometry that would not require the diffuser assembly 205 to be detached from the second end 211 for replacing the power supply circuit 2 3, the diffuser assembly 205 may be attached to the second end 211 permanently or in a manner that the diffuser assembly 205 and the second end 211 are not easily detachable by an end user/layman or consu mer of the bulb 200. The diffuser assembly 205 and the second end 211 are detachable only in a factory setting or in a repair shop. Restricting detachment of the diffuser assembly 205 and the second end 211 reduces possibility of damaging the printed circuit board 2 5, the lighting element 285 and other components thereof. In one possibility, the diffuser assembly 205 may be glued to the second end 211. G lue or any other fastener may be used for attaching the diffuser assembly 205 and the second end 211. Glue or a fastener is selected so that detaching of the diffuser assembly 205 and the second end 211 is carried out in a factory setting. Disposing the second housing 203 into the cavity 231 brings the first node 233 and the second node 265 in electrical contact. The head of the first node 233 gets inserted into the hole of the second node 265 and other electrical contacts are also established. Electrical connection between the third node 263, the first node 233 and the second node 265 establishes a current path between the third node 263, first node 233, second node 265 and the lighting element 285 through the power supply circuit 243. When the adapter 223 is engaged to the power source, the third node 263 comes in electrical contact with the power source and receives input power from the power source. The input power is transmitted to the power supply circuit 2 3. The power supply circuit 2 3 provides output at the first node 233 which in turn, energise the lighting element 285 through the second node 265.

[0038] I n one possibility, the second housing 203 is press-fitted into the cavity 231. I n a further possibility, the first housing 201 and the second housing 203 are clamped. A person skilled in the art, after reading this specification, shall understand that a combination of threads, hook, groove, clamp and press-fitting etc. may be provided with any one or both of the first housing 201 and the second housing 203 to attach the first housing 201 and the second housing 203. Similarly, the adapter 223 and the body 213 may be attached. In one embodiment, the adapter 223 is removably attached to the body 213. Further in one possibility, the adapter 223 and the body 213 are press-fitted. I n another possibility, the adapter 223 is provided with threads and the body 213 is provided with complimentary threads and the adapter 223 and the body 213 are threaded. In a further possibility, the adapter 223 and the body 213 are clamped. 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 both of the adapter 223 and the body 213 to attach the adapter 223 and the body 213.

[0039] To establish the current path, any one or more of the second housing 203, the first housing 201, the printed circuit board 2 5, the power supply circuit 2 5, the body 213 and the adapter 223 may be provided with a number of electrical nodes that are configured to couple to each other. Further it would become apparent to a person in the art, after reading this specification, that electrical nodes may include the first node 233, the second node 265 and the third node 263 etc. Further it would become apparent to a person in the art, after reading this specification, that for any one or more of the first node 233, second node 265 and third node 263 or otherwise provided electrical node may be a head, a hole, an O-ring, a socket, contact point, any other electrical node or a combination thereof. I n one example, the first node 233 is a head and the second node 265 is a hole and the head is inserted into the hole to electrically couple the first node 233 and the second node 265 to establish the current path. In another example the first node 233 is a hole and the second node 265 is a head and the head is inserted into the hole to electrically couple the first node 233 and the second node 265. In a further example, the first node 233 is an O-ring and the second node 265 is a head or an electrical contact and the O-ring is coupled to the head or the electrical contact point to establish the current path. Similarly, in a further example the second node 265 is an O-ring and the first node 233 is a head or an electrical contact and the O-ring is coupled to the head or the electrical contact point to establish the current path. Similarly, the third node 263 may be a head, an O-ring or any other electrical contact or socket. It would become apparent to a person skilled in the art, after reading this specification, that other examples of the first node 233, the second node 265 and the third node 263 are possible.

[oo jO] According to another feature of the present subject matter the engager 293 engages the power source and the adapter. A person skilled in the art shall appreciate that the present subject may be practiced, made and sold without the power source. In another embodiment, the engager 293 is an Edison screw type engager. To engage the adapter 223 using Edison screw type engager, the bulb 200 is screwed to engage the adapter 223 and the power source. It would further become apparent to a person skilled in the art, after reading this specification that other configuration of the engager 293 and the adapter 223 are possible that enables engaging of the power source and the adapter 223.

[oo ji] According to an aspect, the present subject matter also provides a bulb assembly. The bulb assembly is the second housing 203. The power supply circuit 2 3 is disposed in the second housing 203. Further, electrical connection is established between the first node 233 and the third node 263 through the power supply circuit 2 3 to establish a current path between the first node 233 and the third node 263 through the power supply circuit 2 3. The bulb assembly is configured to be disposed into the cavity 231 of the first housing 201 as discussed above.

[00 2] Reference is now made to FIG. 3(a) and FIG. 3(b) collectively. In that FIG. 3(a) being a cross-sectional view of a bulb 300 and FIG. 3(b) shows a more detailed a second housing 303 of the bulb 300. [00 3] FIG. 3(a) and FIG. 3(b) show a first housing 301, a second end 311, a first end 321, a cavity 331, a diffuser 315, a collar 325, a printed circuit board 3 5, screws 355, fastener 383, a lighting element 385, a second node 365, a power supply circuit 3 3, the second housing 303, a body 313, a first node 333, an adapter 323, a third node 363, an engager 393 and a spring 399. The inset in FIG.3 shows an exploded view of the body 313 of the second housing 303 of the bulb 300.

[oo j f] The bulb 300 has a diffuser 315. The diffuser 315 is clamped on the second end 311 of the first housing 301. The collar 325 may be used for clamping the diffuser 315 on the second end 311. The printed circuit board 3 5 is attached at the second end 311. The screws 355 are used to attach the printed circuit board 3 5. The lighting element 385 is mounted on the printed circuit board 3 5. The printed circuit board 3 5 is also provided with the second node 365. The first housing 301 has the cavity 331. The bulb 300 is provided with the second housing 303. The second housing 303 includes the body 313 and the adapter 323. The body 313 of the second housing 303 is disposed in the cavity 331. The body 313 is provided with the first node 333. The first node 333 includes two heads. The heads are provided with the spring 399. The spring 399 is disposed in the cavity 331. The spring 399 is configured to snug fit the second housing 303 in the cavity 331. In one possibility, the spring 399 may be provided with the first node 333. In another possibility, the spring 399 may be provided with the second node 365. In a further possibility, the spring 399 may be provided along the wall of the cavity 331. In yet another possibility, the spring 399 may be provided along the wall of the second housing 303. In one possibility, the spring 399 is provided to couple the first node 333 and the second node 365. In another embodiment the spring 399 is provided for establishing a current path. The power supply circuit 3 3 is disposed in the body 313. The body 313 is provided with fastener 383. The fastener 383 in this embodiment is threads. The second housing 303 is disposed in the cavity 331 with the help of threads. The body 313 of the second housing 303 is provided with threads and the first housing 301 is provided complementary threads in the cavity 331. When the body 313 of the second housing 303 is disposed into the cavity 331 through the first end 321 and screwed the threads of the body 313 and the cavity 331 are engaged. The spring 399 is depressed due to the pressure exerted on the second housing 303 while disposing the second housing 303 in the cavity 331. The depressed spring 399 snug fits the second housing 303 in the cavity 331. Sung fitting the second housing 303 and the spring 399 establishes an electrical connection between the first node 333 and the second node 365. The adapter 323 of the second housing 303 is provided with the third node 363. The third node 363 is connected to the power supply circuit 3 3. Further the third node 363 is configured to establish electrical coupling between a power source and the power supply circuit 3 3. The power source is external to the bulb 300. The adapter 323 is also provided with the engager 393. The engager 393 is configured to attach the adapter 323 with the power source. Engaging the adapter 323 and the power source establishes electrical coupling between the power source and the third node 363.

[00 5] Reference is now made to FIG. 4(a) through FIG. (d) collectively. In that FIG. (a) being exploded view and FIG. 4(b) being a cross-sectional view of a bulb 400 and FIG. (c) and FIG. 2(d) show a more detailed exploded views of various parts the bulb 400.

[0046] FIG. ^ shows a schematic diagram of a bulb 400 according to another embodiment of the present subject matter. FIG. shows a diffuser 415, a first housing 401, a second end 411, a first end 21, a cavity 31, a printed circuit board 5, a lighting element 485, a clamp 95, a second housing 03, a body 13, an adapter 23, a power supply circuit 3, a first node 33, a second node 465, a third node 63, an engager 93, screws 455 and fastener 53, 73.

[00 7] The bulb 400 of this embodiment, has the diffuser 415 mounted at the second end 411 through the cavity 31. The diffuser 415 is inserted through the first end 421 and clamped at the second end 411 with the help of clamp 95. Similarly, the printed circuit board 5 is also inserted through the first end 21 and clamped at the second end jii. Further in this embodiment, the second housing 03 has the external wall and the first node 433 is provided on the external wall. In addition, the first housing 401 has an internal wall and the second node 465 is provided on the internal wall. The body 13 of the second housing 03 is provided with slides to guide insertion of the body 13 into the cavity 31. According to one possibility, the body 13 is attached to the adapter 23 with the screws 455. The third node 63, the engager 93, the lighting element 485, the power supply circuit 443, the printed circuit board 5 and fastener 453, 473 etc. remain substantially the same as discussed with respect to the bulb 300 of FIG. 3 (a) and FIG. 3(b) and the bulb 200 of FIG. 2(a) through FIG. 2(e). A person skilled in the art shall understand, after reading this specification, that the bulb may be constructed substantially according to the present subject matter as shown in FIG. 4(a) through FIG. 4(d) without departing from the spirit of the present subject matter.

[0048] FIG. 5 shows a block diagram 500 for method of manufacturing a bulb according to the present subject matter. According to the method 500, at block 501 a printed circuit board is mounted at a second end of a first housing. The printed circuit board includes a lighting element. The lighting element is mounted on the printed circuit board. The first housing has a first end, and a cavity is defined in the first housing between the second end, the first end and the printed circuit board. At block 503 a second housing is removably disposed at least partially in the cavity through the first end. The second housing comprises an adapter and a body attached to the adapter and a power supply circuit is disposed in the body. And the body of the second housing is disposed in the cavity. At block 503 a current path is established through the power supply circuit to energise the lighting element. At block 513 a spring is disposed in the cavity to snug fit the second housing in the cavity. At block 511, a diffuser is attached at the second end to cover the lighting element. The diffuser is configured to diffuse light emitted by the lighting element.

[0049] FIG. 6 shows a block diagram 600 for a method of manufacturing a bulb assembly according to the present subject matter. According to the method 600, at block 601 a second housing is provided. The second housing comprises an adapter and a body. At block 603 a power supply circuit is disposed in the body. At block 605 the adapter and the body are attached. The second housing is configured to removably dispose at least partially in a cavity. The cavity is formed in a first housing of a bulb. According to a further aspect of the method 600, the block 603 further includes a block 613, at block 613 the power supply circuit is coupled to a first node and to a third node to establish a current path from the first node to the third node through the power supply circuit. According to a further aspect of the method 600, the block 601 further includes a block 611, at block 611 the second housing is provided with a spring. The spring is disposed in the cavity. The spring is configured to snug fit the second housing in the cavity.

[0050] 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. However, 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 provided with a second end, a first end and a cavity; a printed circuit board mounted at the second end; a lighting element mounted on the printed circuit board; and a second housing having an adapter and a body attached to the adapter and a power supply circuit is disposed in the body, wherein the second housing is removably disposed at least partially in the cavity and the second housing is configured to couple the power supply circuit and the lighting element.

2. The bulb of claim 1, wherein the body is substantially cylindrical and the body is configured to be disposed into the cavity through the first end.

3. The bulb of claim 1, wherein the second housing is provided a first node, and wherein the first node is electrically coupled to the power supply circuit. it. The bulb of claim 3, wherein the second housing has an external wall and the first node is provided on the external wall and the first housing has an internal wall and a second node is provided on the internal wall, the second node is electrically coupled to the lighting element and the first node is configured to be coupled to the second node.

5. The bulb of claim 1, wherein the bulb is provided with a spring disposed in the cavity.

6. The bulb of claim 1, wherein the adapter comprises a third node, the third node is coupled to the power supply circuit.

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

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

9. The bulb of claim 1, wherein a diffuser is attached at the second end that covers the lighting element and configured to diffuse light emitted by the lighting element.

10. A bulb assembly comprising: a second housing, the second housing comprises an adapter and a body attached to the adapter; and a power supply circuit is disposed in the body, wherein the second housing is configured to be removably disposed at least partially in a cavity, wherein the cavity is formed in a first housing of a bulb.

11. The bulb assembly of claim io, wherein the body is configured to be inserted into the cavity through a first end of the first housing.

12. The bulb assembly of claim io, wherein, the second housing is provided a first node, and the first node is electrically coupled to the power supply circuit and the first node is configured to couple the power supply circuit and a lighting element, wherein the lighting element is mounted on a printed circuit board and the printed circuit board is attached to a second end of the first housing.

13. The bulb assembly of claim 12, wherein the body has an external wall and the first node is provided on the external wall. i f . The bulb assembly of claim 12 wherein, the first node is provided with a spring.

15. The bulb assembly of claim 10, wherein the adapter comprises a third node is coupled to the power supply circuit.

16. A method of manufacturing a bulb comprising: mounting a printed circuit board at a second end of a first housing, wherein a lighting element is mounted on the printed circuit board and the first housing has a first end, and a cavity is defined in the first housing between the second end, first end and the printed circuit board; disposing removably a second housing at least partially in the cavity through the first end, wherein the second housing comprises an adapter and a body attached to the adapter and a power supply circuit is disposed in the body; and coupling the power supply circuit and the lighting element.

17. The method of claim 16, wherein the method comprises disposing a spring in the cavity.

18. The method of claim 16, wherein mounting the printed circuit board includes attaching a diffuser at the second end.

19. A method for manufacturing a bulb assembly comprising: providing a second housing, the second housing comprises an adapter and a body; disposing a power supply circuit in the body; and attaching the adapter and the body, wherein the second housing is configured to removably disposed at least partially in a cavity, wherein the cavity is formed in a first housing of a bulb.

20. The method of claim ig, wherein disposing comprises coupling the power supply circuit and a first node, and the power supply circuit and a third node wherein the first node and the third node are coupled through the power supply circuit, wherein the third node is provided in the adapter.

21. The method of claim ig, wherein providing second housing comprises providing a spring.