| Patent Number |
Title Of Patent |
Date Issued |
| 5978122 |
Noise suppression method for wavelength division multiplexing transmission system |
November 2, 1999 |
| A method of suppressing noise and improving the optical transmission characteristic of a wavelength division multiplexing transmission system provides lights for suppressing noise from the light sources (NS1 and NS2) which are multiplexed on the wavelength division multiplexed signal. |
| 5510930 |
Light amplifying apparatus |
April 23, 1996 |
| A light amplifying apparatus adopting a redundant structure. Optical isolators 13, 14 are inserted between pump light sources 1, 2 and a photocoupler 4 so as to prevent injection locking, thereby preventing fluctuation of pump power.In another embodiment, optical fibers 15 adequately lon |
| 4288720 |
Method of erasing information in a scan converter storage tube |
September 8, 1981 |
| A method for ready and thorough erasure of information in a scan converter storage tube of the class including an electron gun of an electrostatic focus and deflection variety and a storage target having a substrate made from sapphire or like monocrystalline insulator. The storage surfac |
| 4231636 |
Variable field curvature lens system |
November 4, 1980 |
| An optical lens system is provided having the capability of selectively varying the peripheral field curvature to improve focusing for nonplanar objects and for special photographic effects. The lens system can include in sequence, a first lens group of positive refractive power, a secon |
| 4198126 |
Zoom lens system capable of macrophotography |
April 15, 1980 |
| The present lens system is capable of providing both a zooming operation and also a relatively efficient and economical macrophotography mode of operation. The zoom lens system contains the basic conventional lens groups of a focusing lens group, variator lens group, compensator lens |
| 3972056 |
Varifocal lens assembly |
July 27, 1976 |
| A varifocal lens assembly of a type including at least two lens groups, a first lens group being axially movable parallel to the optical axis of the varifocal lens assembly for varying the focal length of the optical system of the varifocal lens assembly. An automatic focusing device is |
| 3940788 |
Color television camera optical system |
February 24, 1976 |
| An optical system in a single or double tube color television camera for minimizing color shading, moire patterns and color beats includes along the image optical axis a phase grating low pass filter, a color encoding filter and a lenticular lens member oriented relative to each other an |
