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| Number | Title | Issue Date |
| 7423819 | Fixed-focus lens A fixed-focus lens including a first lens group, a second lens group, and a third lens group is provided. The first lens group has a negative refractive power, includes a plurality of lenses, and is disposed between an object side and an image side. The lenses of th... | 09/09/2008 |
| 7095564 | Zoom lens, lens unit, camera and portable information terminal device A third group of lenses is constructed by subsequently arranging those four lenses from an object side to an image side which include a positive lens, a cemented lens of a positive lens and a negative lens, and a positive lens, both of a surface of the third group o... | 08/22/2006 |
| 7049004 | Index tunable thin film interference coatings According to various embodiments and aspects of the present invention, there is provided a dynamically tunable thin film interference coating including one or more layers with thermo-optically tunable refractive index. Tunable layers within thin film interference co... | 05/23/2006 |
| 6937391 | Optical viewer instrument with photographing function In an optical viewer instrument with a photographing function, there is provided a telescopic lens system for observing objects, and a digital camera system including a solid-state image sensor and a photographing lens system associated with each other such that an ... | 08/30/2005 |
| 6927906 | Binocular telescope with photographing function A binocular telescope with a photographing function includes a pair of telescopic optical systems, a casing for receiving the telescopic optical systems, and the casing has outer-side end portions. A camera system includes a photographing optical system, and a solid... | 08/09/2005 |
| 6912095 | Projection lens system A compact and light-weighted projection lens system that is capable of projecting an image at an angle as wide as 75 degrees with sufficient field angle and brightness as represented by F number of approximately 2.4, that is capable of effectively correcting chroic ... | 06/28/2005 |
| 6295169 | Image readout lens and image readout apparatus using the same In an image readout lens comprising four lens elements having positive, negative, negative, and positive refracting powers, respectively, the glass material for at least one of the second and third lenses is defined in terms of relative partial dispersion... | 09/25/2001 |
| 6252723 | Objective optical system An objective optical system comprising, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and a third lens unit having a positive refractive power, wherein the second... | 06/26/2001 |
| 5835286 | Standard lens system having a large aperture ratio A standard lens system composed, in order from the object side, of a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power: the ... | 11/10/1998 |
| 5724190 | Objective lens for endoscope An objective lens for an endoscope includes a first lens group having one negative lens, a second lens group having at least one positive lens, and a third lens group including a positive lens. The objective lens satisfies the following relationship: θ | 03/03/1998 |
| 5715098 | Lens system for a head separated type charge coupled device camera Disclosed is a telephoto-type lens system of a head separated charge coupled device (CCD) camera, which includes a first lens group having a positive focal length, a second lens group having a negative focal length, and a third lens group. The first lens ... | 02/03/1998 |
| 5589989 | Compact objective lens system A compact objective lens with a diaphragm arranged behind the lens system suitable for use in very compact photographic cameras. The objective lens comprises a plurality of components arranged in a triplet or a triplet type configuration and is capable of... | 12/31/1996 |
| 5572369 | Triplet-type lens for use in a compact photographic camera A compact objective lens system with a diaphragm arranged in front of or preferably behind the lens system and suitable for use in compact photographic cameras. The objective lens comprises a plurality of components arranged in a triplet-type configuratio... | 11/05/1996 |
| 5568325 | Achromatic lens system An achromatic lens system includes in order, from the object side, a front lens group, a chromatic aberration correcting lens group, and a rear lens group. Aberrations, including spherical aberration, coma, astigmatism, curvature of image, as well as axia... | 10/22/1996 |
| 5530591 | Objective lens for endoscope An objective lens for an endoscope includes a first lens group having one negative lens, a second positive lens group having at least one positive lens, and a third positive lens group having a cemented lens consisting of one positive lens and a negative ... | 06/25/1996 |
| 5526191 | Fourier transform lens assembly A Fourier transform lens assembly suited for use in an optical information processor includes a first lens group having a positive power, a second lens group having a negative power disposed on one side of the first lens group, and a third lens group havi... | 06/11/1996 |
| 5465178 | Focusing optical system for semiconductor lasers The invention is directed to a focusing optical system for semiconductor lasers, which is regulated in terms of magnification power in both its directions normal to the optical axis, so that the back focus of sufficient magnitude can be made equal in both... | 11/07/1995 |
| 5305147 | Eyepiece lens system for endoscopes An eyepiece lens system for endoscopes comprising a plurality of lens components and using at least one aspherical surface. This eyepiece lens system is composed of a small number of lens elements and has favorably corrected aberrations.... | 04/19/1994 |
| 5257134 | Zoom lens A zoom lens for the projector includes, in order from a screen, a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third lens unit of positive refractive power, zooming from the wide-angle end to the tele... | 10/26/1993 |
| 5202795 | Eyepieces The invention relates to an eyepiece that has an improved image surface flatness even at a wider field angle, is well corrected for various aberrations inclusive chromatic aberration of pupil and is usable with inexpensive microscopes (esp., stereoscopic ... | 04/13/1993 |
| 4711536 | Color separating lens composed of three lens units Disclosed is a color separating a color separating lens composed of 3 lens units which is small in number of lenses, can be manufactured at less cost and can provide a good focusing performance over the entire visible area.... | 12/08/1987 |
| 4676607 | Behind stop lens A behind stop lens comprises, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave lens, a third lens which is a biconvex lens, and a fourth... | 06/30/1987 |
| 4606615 | Behind stop lens A behind stop lens has, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave negative lens, a third lens which is a biconvex positive lens, ... | 08/19/1986 |
| 4415241 | Tessor type lens systems for facsimile An improved tessor type lens system for facsimile having a large aperture ratio and a high contrast are provided. The lens system comprises for components between object and image as follows; a first positive meniscus lens element, a second biconcave lens... | 11/15/1983 |
| 4400065 | Multi-purpose telescope A multi-purpose telescope objective having a Petzval type lens configuration and including an iris diaphragm.... | 08/23/1983 |
| 4370032 | Projection lens A compact projection lens for projecting a predetermined area of an original surface upon a solid image pick-up element in original reading such as facsimile or the like, characterized in that F-number is bright, the projection lens has a high resolving p... | 01/25/1983 |
| 4281908 | Tesser type objective lens system having a rear aperture stop An improved tesser type objective lens system having a rear aperture stop with a relatively wide field angle of about 60° and an F-number of about F 2.8 is provided. The thickness of the second negative lens in the lens system is increased relative to th... | 08/04/1981 |
| 4264139 | Lens system for facsimile A lens system for facsimile comprising a first positive lens component, a second biconcave lens component and a third lens component consisting of a negative lens element and a positive lens element, said lens system having high OTF and assuring very low ... | 04/28/1981 |
| 4213674 | Tessar form photographic lens The present invention relates to a Tessar form photographic lens consisting of four lenses in three components. The first component consists of a positive meniscus lens having a convex surface at the object side, the second component consists of a bi-conc... | 07/22/1980 |
| 4192579 | Behind-stop type lens system for photographic cameras A lens system for photographic cameras which has a very short total length and wherein aberrations are favorably corrected. Said lens system comprises a first positive meniscus lens component, a second biconcave lens component and a third cemented doublet... | 03/11/1980 |
| 3953112 | Behind-stop type compact photographic lens system A behind-stop type compact photographic lens system comprising three lens components of four lenses, which is arranged to satisfy the following conditions for the purpose of preventing insufficient marginal ray and favourably correcting various aberration... | 04/27/1976 |
