| 摘要 |
A combined light pointer and marker comprises a replaceable pen, an energy supply, a light source and an ON/OFF switch. When the light pointer is in use the tip of the pen is covered or retracted. Conversely, when the tip of the pen is exposed, the light source is deactivated. In a preferred embodiment, conductors in a pen cap engage conductors in the pen and light source housing, thereby making energy available in the housing from batteries desirably located in the cap. When the cap is removed to expose the pen tip for writing, the connection between the conductors is broken, battery energy is no longer available in the housing, and depressing the ON/OFF switch cannot activate the light source. This provides an important safety feature.
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