Takahiro Miura

A Novel Microminiaturized Aspherical Lens with a High Numerical Aperture

A novel small lens of 0.221 mm diameter and 0.65 numerical aperture (NA) fabricated by using a new process which consists of a molded lens technology and a high refractive index thick film fabrication technology is presented.

A novel microminiaturized aspherical lens with a high numerical aperture [optical storage]

Developed the new production method of the small-sized lens with the excellent characteristic of the mold lens process. The NA0.65 lens with the effective diameter of 0.221 mm was successfully fabricated. It was confirmed that this production method is suitable for a small diameter lens. Furthermore this method can be applied to higher numerical aperture lenses, and makes it possible to manufacture a number of lenses simultaneously.

Microminiaturized Aspherical Single Lens with Numerical Aperture of 0.9 for Blue Laser Diode

A single lens with an effective diameter of 0.3 mm and a high numerical aperture (NA) of 0.9 for a blue laser diode has been developed. The current wavefront aberration of the lens is approximately equal to that of a conventional high-NA lens. The optical flying head with a mold process lens (MPL) can be respectively designed so that the disk-tilt margin may become wide for each cover layer thickness of the disk (compact disk, digital versatile disk, etc.).