1. Parameters of focusing object lens and structure of 3-D storage media are designed.

2. Optic - design of object lens with microscope, CCD, image - collect card and other relational operation were completed.

3. The optical writing object lens of the laser direct writing device must be focused in spots by a focusing-servo mechanism.

4. The purpose of this study is to design a diffraction optical element using magnetorheological fluid for a switchable object lens used in optical pickup head.

5. We must design the ratio of the source beam size and aperture of object lens reasonably to assure energy matching ratio (EMR) and to achieve smaller size of focus point and reasonable focus depth.

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6. This method has a practicable significance to the un-cooling infrared object lens design.

7. If the objective lens is further away from the compact disk than the focal length of the object lens, then the cylindrical lens again creates an elliptical image on the photodetector array.

8. This translucent ceramic can be advantageously used as, for example, a material for object lens (2) fitted to light pickup (9).

9. We consider that the digital image acquired by 20x object lens is suitable to be the virtual slide.

10. A spectacle used for myopia working consists of two lenses with different dioptre object lens, used respectively in watching computer screen and book paper.

11. The result indicated that the system lateral resolution were decided by the separation of optic-fiber bundle and the magnification of object lens.

12. If the objective lens is closer to the compact disk than the focal length of the object lens, then the cylindrical lens creates an elliptical image on the photodetector array.