Optical tungsten wire means the tungsten wire that is applied in the field of optics, such as bulbs.
The bulbs in optical industry include tungsten filament bulb, tungsten halogen bulb, fluorescent tube, metal halide bulb, and LED bulb, among which tungsten filament bulb is the earliest used optical bulb. A more energy-efficient and brighter tungsten halogen bulb can be obtained by improving the tungsten wire.
The optical instrument is equipped with one or more bulbs to illuminate the object to be tested and the measuring scale of the instrument. Therefore, the luminous efficiency of the bulb should be adjusted to the utmost extent to make sure that the imaging is clear and accurate. In other words, the tungsten wire of the bulb should be at the focal point of the instrument condenser and be symmetrical to the optical axis. The light emitted by the condenser is a parallel beam, which is parallel to the main optical axis, and the position of the tungsten wire is correct.
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