High-pressure discharge lamp, lighting method and lighting device for high-pressure discharge lamp, high-pressure discharge lamp device, and lamp unit, image display device and headlight device

A high-pressure discharge lamp comprising:

• an enclosed spheroid bulb that includes a light emitting part having an electrode pair disposed and a discharge space formed therein, and a first sealing part and a second sealing part provided at different ends of the light emitting part;
• and
• a proximity conductor formed from a lead wire, a section of the lead wire being wound around an outer circumference of at least one of the first sealing part and a section of the light emitting part to form a wound portion, and a remaining section of the lead wire forming a lead portion that extends from the wound portion across the light emitting part in proximity to or contacting with an outer surface of the light emitting part, to a side of the discharge lamp on which the second sealing part is disposed, wherein
• the lead portion is electrically connected to the electrode, of the pair, positioned nearer the second sealing part,
• the wound portion is wound substantially spirally at least 0.5 turns in a range from a 2nd reference plane to a 3rd reference plane, and a closed loop around one of the light emitting part and the first sealing part does not exist within the range, where the 2nd to 3rd reference planes are parallel to a 1st reference plane lying orthogonal to a bulb longitudinal direction and including an end of the discharge space positioned directly at a section, having a greatest curvature, of an inner surface of the light emitting part at a base portion of the electrode nearer the first sealing part, the 2nd reference plane being distant 5 mm from the 1st reference plane along the first sealing part and the 3rd reference plane passing through a tip of the electrode nearer the second sealing part, and
• the wound portion and the lead portion are without a closed loop within the range between the 2nd reference plane and the 3rd reference plane.