A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.

A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.

A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.

Disclosed herein is a filament bulb with uniform luminance, which decreases the dark area at the top portion of the filament bulb and increases the luminance efficiency, and includes the following components, a bulb casing, a filament unit, a reflector ring, a driver, and a bulb cap. The bulb casing is connected with the bulb cap, and together, the two define an interior space. The driver is disposed in the bulb cap, whereas the filament unit is disposed within the interior space and the bottom of the filament unit is electrically connected with the driver. The reflector ring surrounds the exterior of the bottom of the filament unit, and is configured to reflect the light emitted from the filament unit to decrease the dark area at the top portion of the filament bulb.

To provide a socket for a halogen lamp, which allows easy attachment and removal operations, as well as enables stable contact between a lamp terminal and an external electrode terminal when the lamp is attached. The socket includes a first holder part having a first hole, a second holder part having a second hole, and a spring member accommodated at a position between the first hole and the second hole and having a third hole. The first hole, second hole, and third hole have a shape extending in a direction that is different from a direction in which the terminal is passed through. The terminal is turned after being passed through the holes, whereby the terminal moves inside the first hole, second hole, and third hole, and is fixed when the terminal reaches an outer edge portion of the third hole of the spring member.

To provide a socket for a halogen lamp, which allows easy attachment and removal operations, as well as enables stable contact between a lamp terminal and an external electrode terminal when the lamp is attached. The socket includes a first holder part having a first hole, a second holder part having a second hole, and a spring member accommodated at a position between the first hole and the second hole and having a third hole. The first hole, second hole, and third hole have a shape extending in a direction that is different from a direction in which the terminal is passed through. The terminal is turned after being passed through the holes, whereby the terminal moves inside the first hole, second hole, and third hole, and is fixed when the terminal reaches an outer edge portion of the third hole of the spring member.

To provide a socket for a halogen lamp, which allows easy attachment and removal operations, as well as enables stable contact between a lamp terminal and an external electrode terminal when the lamp is attached. The socket includes a first holder part having a first hole, a second holder part having a second hole, and a spring member accommodated at a position between the first hole and the second hole and having a third hole. The first hole, second hole, and third hole have a shape extending in a direction that is different from a direction in which the terminal is passed through. The terminal is turned after being passed through the holes, whereby the terminal moves inside the first hole, second hole, and third hole, and is fixed when the terminal reaches an outer edge portion of the third hole of the spring member.

To provide a socket for a halogen lamp, which allows easy attachment and removal operations, as well as enables stable contact between a lamp terminal and an external electrode terminal when the lamp is attached. The socket includes a first holder part having a first hole, a second holder part having a second hole, and a spring member accommodated at a position between the first hole and the second hole and having a third hole. The first hole, second hole, and third hole have a shape extending in a direction that is different from a direction in which the terminal is passed through. The terminal is turned after being passed through the holes, whereby the terminal moves inside the first hole, second hole, and third hole, and is fixed when the terminal reaches an outer edge portion of the third hole of the spring member.

A low pressure mercury gas discharge ultraviolet lamp with a tubular elongate body with two opposing ends, a first end and a second end, which contains a gas filling, and with at least two electric connectors at each end, which are electrically connected to at least one filament being provided at each end. A discharge length is defined between the filaments, in which at least two filaments are provided at each end of the discharge length. The filaments can be individually supplied with electric energy. The at least two filaments at the first end are of different size and different mass, and the at least two filaments at the second end are of different size and different mass.

A low pressure mercury gas discharge ultraviolet lamp with a tubular elongate body with two opposing ends, a first end and a second end, which contains a gas filling, and with at least two electric connectors at each end, which are electrically connected to at least one filament being provided at each end. A discharge length is defined between the filaments, in which at least two filaments are provided at each end of the discharge length. The filaments can be individually supplied with electric energy. The at least two filaments at the first end are of different size and different mass, and the at least two filaments at the second end are of different size and different mass.