Patent · US Active

Projection lens

US8456764B2 · kind B2 · utility

0Cited by

1References

20Claims

0Family size

Assignees

Premier Image Technology(China) Ltd. · CN
HON HAI PRECISION INDUSTRY CO., LTD. · TW

Inventors

Xiao-Na Liu · Tangxia, CN
Fang-Ying Peng · Taipei, TW
Hai-Jo Huang · Taipei, TW
An-Tze Lee · New Taipei, TW
Sheng-An Wang · New Taipei, TW

Key dates

Filing date	Jul 11, 2011
Grant date	Jun 4, 2013
Priority date	—
Expiry date	Sep 23, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/06
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A projection lens includes, in order from the magnification end to the minimization end thereof: a first lens group of a negative refractive power; and a second lens group of a positive refractive power. The projection lens satisfies the formula: 0.061<F/L<0.078; where F represents the effective focal length of the projection lens and L represent the total length of the projection lens.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.