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| Number | Title | Issue Date |
| 7710665 | Imaging optical system There is provided a high-definition imaging optical system including: an aperture stop; a first lens disposed at an image side of the aperture stop, the first lens having a positive refractive power and having a convex object-side surface; a second lens disposed at ... | 05/04/2010 |
| 7443610 | Lens system A lens system comprises a first lens positive in power, a second lens positive in power, a third lens negative in power, a fourth lens positive in power, and a fifth lens negative in power. The lens system meets a criteria of 1.6 | 10/28/2008 |
| 6449104 | Gaussian lens A Gaussian lens having no more than six lens elements of refractive power is formed of, in order from the object side: a first lens element which is biconvex, a second lens element which is a positive meniscus lens with its convex surface on the object si... | 09/10/2002 |
| 6310734 | Imaging lens and image readout apparatus using the same An imaging lens comprises, successively from an object side, a positive first lens L1 having a convex surface directed onto the object side, a negative second lens L2 having a concave surface directed onto an image side, a third lens... | 10/30/2001 |
| 5699196 | Microscope objective lens and microscope A microscope objective lens is provided as a semi-apochromatic microscope objective lens which has a magnification of about 40, has favorably corrected various kinds of aberration, and can also be used for observing fluorescence under downward radiation. ... | 12/16/1997 |
| 4830478 | Video projector lens system The present invention provides a lens system for projecting to a screen a video image formed on a face plate of a cathode ray tube. The lens system comprises, from the screen side to the tube side: a first positive lens unit; a second positive lens unit; ... | 05/16/1989 |
| 4645312 | Photographic lens system A photographic lens system having a field angle of 70° or wider and designed for use with compact cameras having a relative aperture of F/3.5 comprising a first positive meniscus lens component having a convex surface on the object side, a second positiv... | 02/24/1987 |
| 4575198 | Lens system A lens system having three lens groups, or, from front to rear, a 1st lens group having a positive refractive power, a 2nd lens group having a negative refractive power, and a 3rd lens group having a positive refractive power, whereby a proper optical arr... | 03/11/1986 |
| 4458991 | Photographic objective of reduced size A photographic objective of reduced size having five lens components of which the 1st and 2nd counting from the front are meniscus lenses of positive powers convex toward the front, the 3rd is a lens of negative power, the 4th is a lens of positive power,... | 07/10/1984 |
| 4183624 | Lenses A biocular magnifying lens suitable for use as an eyepiece in a night vision device comprises from front to back a positive element which is bi-convex or meniscus convex towards the front, a negative meniscus element concave towards the front, a positive ... | 01/15/1980 |
| 4076390 | Objective for optical system This invention relates to an objective optical sub-system having fewer elements and improved performance specifications as compared to an objective it will replace.... | 02/28/1978 |
