| 摘要 |
<p>The head tracking unit has a tracking portion with tracking elements. A base is provided with a surface to support the unit on the head of a subject such as person. An adhesive strip is provided to fix the surface of base to the head of subject. The tracking elements are positioned on the tracking surface of the tracking portion. The adhesive strip that is attached to the surface of base and the head of subject is maintained removably in normal position on the head of subject.</p> |
