| 摘要 |
A focusing apparatus for a projection television comprises a lens barrel with lenses therein having a pair of shaft-like guide protrusions at symmetrically opposite positions on the lens barrel. A cylindrical barrel support member receives and holds the lens barrel in a proper, focused position. A pair of shaft-like guide slots, inclined along the axial direction of the supporting member, receive and guide the guide protrusions as the barrel is rotated within the support member to thereby achieve focusing. Axial ribs are on the outer surface of the support member and axial protrusions are on the inner surface at corresponding positions. A tightening ring or band encircles the support member and engages and presses the ribs resulting in the axial protrusions being pressed against and locking the lens barrel.
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