Recently, high-end mobile camera phones are spreading rapidly all over the world. In addition, the demands for the
optical zoom as new function of the mobile camera phones are very intense. However, it has been very difficult for the
module manufacturers to propose an ultra compact zoom lens unit which can be mass-producible and fit into the size of
mobile phones. The following three key technologies are essential to mount optical zoom lens units onto mobile phones
maintaining the portability of them. Those are a) optical design method which can achieve ultra compact size and mass
productivity by utilizing plural aspherical glass-mold lenses and controlling decentering sensitivities, b) precise lens
alignment system to compensate the field tilt caused by errors in the fabrication processes such as glass lens molding and
lens assembling, and c) long-stroke compact lens actuators based on our unique SIDMs (Smooth Impact Drive
Mechanisms) technology. By integrating these technologies, we have developed 3 times optical zoom lens unit suitable
for 3 to 5 mega-pixel cameras. The size of our lens unit is one of the world's smallest. The technologies have shown the
new orientation in the future of high-end mobile camera phones. In this paper, we show the foregoing three technologies
and our next generation zoom lens unit under development.
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