LED lamp

1. An LED lamp comprising:

a plurality of light emitting diodes;

a retainer on which the light emitting diodes are mounted;

a wiring pattern formed on the retainer and electrically connected to the light emitting diodes; and

a current input pad and a current output pad connected to the wiring pattern;

wherein the retainer includes first and second mount surfaces that are adjacent to each other via a bent portion, and further includes a third mount surface adjacent to the second mount surface,

normal line directions of the first, the second and the third mount surfaces are different from each other,

the second mount surface and the third mount surface include a first corner and a second corner, respectively, the first corner and the second corner being adjacent to each other,

the current input pad and the current output pad are disposed at the first corner and the second corner, respectively, and

the wiring pattern is configured so that an electrical current supplied to the current input pad is caused to flow via the second mount surface, the first mount surface and the third mount surface before being outputted through the current output pad.

2. The LED lamp according to claim 1 , further comprising a support including a plurality of attachment surfaces whose normal line directions are different from each other,

wherein the retainer is attached to the support in such a manner that each of the first and the second mount surfaces overlaps one of the attachment surfaces.

3. The LED lamp according to claim 2 , wherein the attachment surfaces include a central attachment surface that overlaps the first mount surface,

the support has a shape projecting in a normal line direction of the central attachment surface, the support including a side surface that surrounds the central attachment surface as viewed in the normal line direction of the central attachment surface, and

the attachment surface of the plurality of attachment surfaces that overlaps the second mount surface is provided on the side surface.

4. The LED lamp according to claim 3 , wherein the side surface, as proceeding away from the central attachment surface in the normal line direction of the central attachment surface, proceeds away from the central attachment surface in a direction perpendicular to the normal line direction of the central attachment surface.

5. The LED lamp according to claim 3 , wherein the central attachment surface is rectangular, and

the side surface comprises a plurality of peripheral attachment surfaces that adjoin sides of the central attachment surface, respectively.

6. The LED lamp according to claim 5 , wherein the retainer comprises a rectangular central substrate and a plurality of peripheral substrates separate from the central substrate and surrounding the central substrate,

the first mount surface is an obverse surface of the central substrate,

the second mount surface is an obverse surface of the peripheral substrates,

is an obverse surface of the peripheral substrates,

the bent portion comprises a pair of bendable connection members connecting the central substrate and each of the peripheral substrates,

the paired connection members electrically connect the wiring pattern formed on the central substrate and the wiring pattern formed on the peripheral substrates to each other,

the central substrate is attached to the central attachment surface, and

the peripheral substrates are attached to the peripheral attachment surfaces.

7. The LED lamp according to claim 5 , wherein the retainer comprises a flexible wiring substrate including a rectangular central mount surface that is the first mount surface and a plurality of peripheral mount surfaces that include the second mount surface and that surround the central mount surface,

the bent portion is formed by bending between the peripheral mount surfaces and the central mount surface, and

the retainer is attached to the support in such a manner that the central mount surface is supported by the central attachment surface and the peripheral mount surfaces are supported by the peripheral attachment surfaces.

8. The LED lamp according to claim 3 , wherein the support is provided with a base for supplying electric power to the light emitting diodes, the base being positioned on an opposite side of the central attachment surface in the normal line direction of the central attachment surface.

9. The LED lamp according to claim 2 , wherein the support includes a reflective surface provided around the attachment surfaces.

10. The LED lamp according to claim 9 , wherein the support includes a columnar portion extending between the attachment surfaces and the reflective surface in a direction perpendicular to the reflective surface.

11. The LED lamp according to claim 2 , further comprising a globe that includes an opening and houses the light emitting diodes,

wherein the support is in a form of a frustum including a top surface positioned on an opposite side of the opening of the globe and a plurality of side surfaces surrounding the top surface, and

the globe includes an inner surface inclined in a same direction as a direction in which said plurality of side surfaces adjacent thereto are inclined with respect to the top surface.

12. The LED lamp according to claim 1 , wherein the retainer comprises a plurality of separate substrates,

the first and the second mount surfaces are obverse surfaces of adjacent two of the plurality of substrates,

the bent portion comprises a pair of bendable connection members connecting said two adjacent substrates, and

the paired connection members electrically connect the wiring patterns formed on the two substrates to each other.

13. The LED lamp according to claim 1 , wherein the retainer comprises a flexible wiring substrate,

the first and the second mount surfaces are part of an obverse surface of the flexible wiring substrate, and

the bent portion is formed by bending the flexible wiring substrate.

14. The LED lamp according to claim 1 , further comprising a globe that includes an opening and houses the light emitting diodes.

15. The LED lamp according to claim 14 , wherein an inner surface of the globe includes a portion where a radius of curvature reduces as proceeding away from the opening.

16. The LED lamp according to claim 15 , wherein the globe includes a cylindrical portion and a dome portion connected to the cylindrical portion.

17. The LED lamp according to claim 16 , wherein the cylindrical portion is tapered.