Lamp having improved insulation of the circuit unit

摘要

In a lamp: an LED module and a circuit unit for lighting are housed within an envelope composed of a globe and a case; the LED module is attached to an end of an extension member that extends from a mount, which closes an opening at one end of the case, into the globe; the circuit unit is mounted inside the case; an insulation member disposed inside the case ensures insulation between the mount, which is made of metal, and the circuit unit; the insulation member has a bottomed cylinder portion inserted into the mount, and a protrusion portion formed on an outer circumference of the based cylinder portion that protrudes toward an inner surface of the mount; and the insulation member is attached to the mount by the protrusion portion pressing against the inner surface of the mount.

主权项

1. A lamp comprising:
an envelope that includes a globe and a case; a mount made of an electrically conductive material and having a cylinder portion and a cover portion that closes one end of the cylinder portion, the mount closing an opening at one end of the case; an extension member mounted on the cover portion of the mount and extending into the globe; a light-emitting element attached to the extension member and disposed inside the globe; a circuit unit disposed inside the case and configured to light the light-emitting element; and an insulation member disposed inside the case and insulating the circuit unit from the mount, wherein the insulation member has a cylindrical portion that is inserted into the cylinder portion of the mount and has a protrusion portion that is formed on an outer circumference of the cylindrical portion and that protrudes toward the mount, the insulation member being attached to the mount by the protrusion portion pressing on an inner surface of the cylinder portion of the mount.