Light bulb shaped lamp
A light emitting module includes a base board having a first surface and a second surface opposing the first surface. A plurality of light-emitting diodes is provided on the first surface of the base board. A seal covers the plurality of light-emitting diodes, includes a wavelength conversion material, and covers the second surface of the base board.
1. A light emitting module comprising:
an elongated base board having a first end and a second end at opposed ends of a longitudinal direction of the base board, a first surface, a second surface opposing the first surface and side surfaces extending in the longitudinal direction of the base board;
first and second conductive members provided at the first end and the second end on the first surface of the base board, and extending beyond the first and second ends of the base board in the longitudinal direction of the base board;
first and second power supply terminals respectively provided at the first end and the second end of the base board, and extending transverse to the longitudinal direction of the base board, the first and second power supply terminal electrically connected to the first and second conductive members, respectively;
a plurality of light-emitting diodes provided on the first surface of the base board arranged in a line parallel to the longitudinal direction of the base board and between the first conductive member and the second conductive member, the plurality of light-emitting diodes being connected in series by wires such that each light-emitting diode is connected to an adjacent light-emitting diode;
end wires that connect longitudinal extremities of the plurality of light-emitting diodes to the first and second conductive members; and
an elongated seal including a wavelength conversion material, the elongated seal enclosing all of the plurality of light-emitting diodes,
wherein the light emitting module has an elongated shape,
the elongated seal including the wavelength conversion material contacts all of the plurality of light-emitting diodes, and
a cross-section of the elongated seal, that covers the first surface and the side surfaces of the base board, has a semicircular shape that is uniform along the longitudinal direction of the base board.
2. The light emitting module according to claim 1 , wherein
the seal further includes a translucent material.
3. The light emitting module according to claim 1 , wherein
the plurality of light-emitting diodes is arranged in a straight line, and
the seal is arranged in a continuous straight line on a row of the plurality of light-emitting diodes.
4. The light emitting module according to claim 1 , wherein
the plurality of light-emitting diodes is not mounted on the second surface of the base board.
5. The light emitting module according to claim 1 , wherein
the base board, the plurality of light-emitting diodes, and the seal comprise a light emitter configured to reproduce a simulated light-emitting property equivalent to a filament in an incandescent light bulb.
6. The light emitting module according to claim 1 , wherein
each of the plurality of light-emitting diodes includes a sapphire board and a plurality of nitride semiconductor layers stacked on the sapphire board, and is fixed on the base board with the sapphire board facing the first surface of the base board.
7. The light emitting module according to claim 1 , wherein
the plurality of light-emitting diodes is fixed on the base board by a translucent bonding material.
8. The light emitting module according to claim 1 , wherein
the seal comprises a continuous line of sealing material.
9. The light emitting module according to claim 8 , wherein
a width of the sealing material is greater than a width of the base board.
10. The light emitting module according to claim 8 , wherein
a width of the sealing material at the base board is longer than a height of the sealing material above the base board in cross section.
11. The light emitting module according to claim 1 , wherein
the elongated seal and the light emitting module have a cylindrical shape.
12. The light emitting module according to claim 1 , wherein
the wavelength conversion material included in the seal is a red phosphor.
13. The light emitting module according to claim 1 , wherein
the base board is flexible.
14. The light emitting module according to claim 1 , wherein the elongated seal including the wavelength conversion material comprises a single layer extending from the plurality of light emitting diodes to an outer-most surface of the semicircular shape.
15. The light emitting module according to claim 1 , wherein the elongated seal further encloses the entire base board.
16. The light emitting module according to claim 1 , wherein a longitudinal portion of the base board in which the end wires are provided is free from the light-emitting diodes.
17. A light emitting module comprising:
an elongated base board having a first end and a second end at opposed ends of a longitudinal direction of the base board, a first surface and a second surface opposing the first surface;
first and second conductive members provided at the first end and the second end on the first surface of the base board, and extending beyond the first and second ends of base board in the longitudinal direction of the base board;
first and second power supply terminals respectively provided at the first end and the second end of the base board, and extending transverse to the longitudinal direction of the base board, the first and second power supply terminal electrically connected to the first and second conductive members, respectively;
a plurality of light-emitting diodes provided on the first surface of the base board, arranged in a line parallel to the longitudinal direction of the base board and between the first conductive member and the second conductive member; and
wires that connect the light-emitting diodes in series, each of the wires extending in the longitudinal direction of the base board to connect one of the plurality of light-emitting diodes to an adjacent one of the plurality of light-emitting diodes;
end wires that connect longitudinal extremities of the plurality of light-emitting diodes to the first and second conductive members; and
an elongated seal including a wavelength conversion material, the elongated seal enclosing all of the plurality of light-emitting diodes and enclosing the entire base board, and enclosing the wires extending in the longitudinal direction of the base board,
wherein the light emitting module has an elongated shape,
the elongated seal enclosing the entire base board contacts all of the plurality of light-emitting diodes, and
a cross-section of the elongated seal above the base board, which encloses the wires extending in the longitudinal direction of the base board, has a semicircular shape that is uniform along a longitudinal direction of the base board.
18. The light emitting module according to claim 17 , wherein a longitudinal portion of the base board in which the end wires are provided is free from the light-emitting diodes.