Replacement illumination device for a miniature flashlight bulb
View Patent ↗Disclosed is a method and apparatus for providing a solid state light emitter and driving circuitry integrated into a component module that will retrofit common incandescent light bulb applications. The disclosed embodiment is directed to the retrofitting of small flashlights using miniature bulbs, such as the Mini Maglite®. Because the emitter and driving circuitry cannot readily fit within the envelope of the bulb being replaced, the volume occupied by the module needs to be acquired from within the flashlight's interior, such as from part of the volume occupied by the reflector. In that case, the invention includes a replacement reflector supplied with the module. The invention provides that no original functionality of the flashlight is sacrificed. Consideration is also given to the conduction of heat from the light emitter and module.
1. An illumination device, such as a flashlight, comprising:
(a) a light reflector including (i) light reflecting surface segments which circumscribe a given area and which define a forwardly extending central axis of illumination and (ii) a rearward facing edge;
(b) an illumination assembly including (i) a printed circuit board having a front surface and a back surface, (ii) at least one solid state light source on the front surface of said printed circuit board, and (iii) control circuitry connected with said solid state light source and printed on at least one of the surfaces of said printed circuit board for connecting the solid state light source to a source of power in order to control the illumination of said solid state light source; and
(c) a housing arrangement including a first housing portion thereof connected with said light reflector and a second housing portion connected with said illumination assembly (i) such that said first housing portion and said light reflector are movable together relative to said second housing portion and said illumination assembly, (ii) such that the solid state light source is disposed within said given area in a way which causes light from said solid state light source to emanate out of said given area in the general direction of said forwardly extending central axis of illumination and (iii) such that the rearward facing edge of said light reflector engages a bearing surface defined by said illumination assembly during at least some of said relative movement, wherein said relative movement of said first and second housing portions includes both rotational movement about and simultaneous axial movement along said central axis, said first housing portion supporting said reflector for rotation therewith such that the rearward facing edge of the reflector engages in a sliding manner on said bearing surface during at least some of the rotation of said first housing portion relative to said second housing portion and wherein said illumination assembly is configured such that said bearing surface is movable in a direction parallel with said central axis between a first position for disconnecting said circuitry and said solid state light source from said source of power and a second position for connecting said circuitry and solid state light source to said source of power, and wherein the rotation of said housing portion causes the rearward facing edge of said reflector to move said bearing surface from said second position to said first position as it slidably engages said bearing surface.
2. An illumination device according to claim 1 wherein the front surface of said printed circuit board includes said bearing surface.
3. An illumination device according to claim 1 including a thermally conductive material disposed against the back surface of said printed circuit board for directing heat from said circuitry including said solid state light source away from the printed circuit board.
4. An illumination device according to claim 1 wherein said solid state light source is an LED.
5. An illumination device according to claim 1 wherein said printed circuit board and its front and back surfaces are round in shape.
6. An illumination device, comprising:
(a) a housing arrangement including (i) a first housing portion thereof defining a given light source receiving area which defines a forwardly extending central axis of illumination and (ii) a second housing portion such that said second housing portion is movable along said central axis toward and away from said first housing portion; and
(b) an illumination assembly including (i) a printed circuit board having a front surface and a back surface, (ii) at least one solid state light source on the front surface of said printed circuit board, and (iii) control circuitry connected with said solid state light source and printed on at least one of the surfaces of said printed circuit board for connecting the solid state light source to a source of power in order to control the illumination of said solid state light source, said illumination assembly being connected with said housing such that the solid state light source is disposed within said given area in a way which causes light from said solid state light source to emanate out of said given area directly and/or indirectly by means of reflection in the general direction of said forwardly extending central axis of illumination; and
(c) said illumination assembly (i) being connected with said first housing portion for movement between a first position for connecting said control circuitry and solid state light source with said source of power and a second position for disconnecting said circuitry and solid state light source from said source of power and (ii) including a surface against which said second housing portion engages during its movement toward said first housing portion so as to move said illumination assembly from said first position to said second position so as to disconnect said circuitry and said solid state light source from said source of power.
7. An illumination device according to claim 6 wherein said sold state light source is an LED.
8. An illumination device according to claim 6 wherein said device is a flashlight.
9. An illumination device according to claim 6 wherein the front surface of said printed circuit board includes said bearing surface.