Bizarre Patents
Nicotine Containing Dental Floss
Keep away cavities and cancer at the same time.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5552938 | Projection device for projecting an original image onto a screen Disclosed is a projection optical system for projecting an original image onto a screen, including a projection lens comprising, in succession from the screen side, a first lens unit having positive refractive power, and a second lens unit having positive... | 09/03/1996 |
| 5552936 | Two-unit zoom lens A two-unit zoom lens comprises a first lens unit having a negative refracting power and a second lens unit having a positive refracting power. The first lens unit and the second lens unit are located in this order from the side of an object. At least eith... | 09/03/1996 |
| 5546232 | Two-group zoom lens A two-group zoom lens is provided which has a first lens group of negative power and a second lens group of positive power, located in this order from an object to be photographed. The first and second lens groups are moved relative to one another to prov... | 08/13/1996 |
| 5539581 | Zoom lens system A zoom lens system including, in order from the object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, in which zooming is effective by varying the spacing between the first lens unit a... | 07/23/1996 |
| 5537254 | Compact small format zoom lens A zoom lens particularly suitable for use in a camera using small format film has two moving lens groups, a front negative group and a rear positive group. The rear positive group has a stop, a positive component and a negative component movable as a unit... | 07/16/1996 |
| 5530595 | Variable focus color corrected field lens A variable focus color corrected field lens for accepting rays having a divergence of from 0, wherein the rays are collimated, to a divergence of 10 milliradians full angle and directing the rays to the same point of an optical system. The present lens is... | 06/25/1996 |
| 5528428 | Compact wide-angle objective lens A wide-angle objective lens is comprised, from the object side, of a first lens component which is a negative meniscus lens having its convex surface facing the object side, a second lens component which is a meniscus lens having its convex surface facing... | 06/18/1996 |
| 5513043 | Real image type variable power finder A real image type variable power finder includes an objective lens system, an ocular lens system, a condenser lens, and an image erecting optical system. The objective lens system includes a first lens group having a negative power and a second lens group... | 04/30/1996 |
| 5493448 | Zoom lens having weak front lens group A zoom lens having two groups of lens components including from the object side a positive group and a negative group. The positive group includes two lens units, a weak unit, and a positive unit, while the negative group has at least one negative lens co... | 02/20/1996 |
| 5485314 | Standard zoom lens A compact standard zoom lens with a power ratio of the order of 2.7 and a wide-angle field angle of about 74° comprises: a first lens group constructed of a negative meniscus lens with its concave surface having a large curvature toward an image and a po... | 01/16/1996 |
| 5473473 | Two element plastic zoom camera lens A zoom camera lens for an inexpensive camera, for example, a single use camera, has two plastic elements including a positive element and a negative element and a stop. Each of the surfaces of each of the elements is concave to the stop. Preferably, the l... | 12/05/1995 |
| 5452134 | Zoom lens of two-unit construction In a zoom lens of two-unit construction comprising a first lens unit having negative refractive power as a whole and a second lens unit having positive refractive power as a whole, the first lens unit comprises, in succession from the object side, a negat... | 09/19/1995 |
| 5448412 | Telephoto zoom lens system A telephoto zoom lens system is disclosed in which the wide-angle end starts with the middle telephoto range and in which focusing is done by means of a lighter focusing lens group than what is used in the method of focusing by advancing the front lens co... | 09/05/1995 |
| 5436684 | Photographing apparatus A photographing apparatus comprises a first lens group to variably change a magnification, a second lens group to perform a focus adjustment, a movement measuring sensor to measure a moving speed of the first lens group, a movement control circuit to move... | 07/25/1995 |
| 5434712 | Zoom lens system for use with a compact camera A zoom lens system for use with a compact camera comprises, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length and which performs zooming by changing the distance between... | 07/18/1995 |
| 5418648 | Varifocal lens system A varifocal lens system consists of first and second lens groups arranged in this order from the image forming side. The first lens group consists of four lenses and has a negative refracting power and the second lens group consists of three lenses and ha... | 05/23/1995 |
| 5392159 | Zoom lens device of two-lens group structure and driving device of varifocal lens of two-lens group structure In a zoom lens device of a two-lens group structure, positive and negative lens groups are sequentially arranged from a photographing field side. The zoom lens device has a controller for controlling a rear focusing operation for moving the negative lens ... | 02/21/1995 |
| 5388006 | Telephoto camera lens The telephoto lens is in each case put together from two different lens systems, a front group and a focusing group. The object-side front groups have fixedly arranged lens elements or lens element groups and the image-side focusing groups have mutually d... | 02/07/1995 |
| 5381268 | Compact wide angle zoom lens A wide angle zoom lens comprises a first lens group having a negative overall refracting power and a second lens group having a positive overall refracting power disposed in the named order from the object side, in which a magnification change is carried ... | 01/10/1995 |
| 5381269 | Zoom lens A compact 2X zoom lens system consisting of a small number of lens elements. The zoom lens system consists of two lens groups, a first lens unit having a negative refractive power and a rear lens unit of positive refractive power. Both lens units are mova... | 01/10/1995 |
| 5371631 | Wide angle zoom lens system The invention provides an ultra-wide zoom lens system that has a very wide angle coverage, as indicated by a field angle change of about 92° to about 65°, is bright, as indicated by an F-number of 4.5 at the telephoto end, and is relatively simple in le... | 12/06/1994 |
| 5357374 | Zoom lens system A zoom lens system consisting of three groups, wherein intervals between the groups are varied to thereby change a focal length. In this zoom lens system, the number of lenses constituting the groups is one, respectively. That is, a first group is constit... | 10/18/1994 |
| 5353161 | Variable focal length lens A variable focal length lens comprises a first-set lens, which is constituted of two lenses and has a negative refracting power as a whole, and a second-set lens, which is constituted of five lenses and has a positive refracting power as a whole. The firs... | 10/04/1994 |
| 5339195 | Two unit zoom lens system The present invention provides a two-unit zoom lens system comprising, in order from the object side, a first lens unit G1 having a negative refracting power and a second lens unit G2 consisting of a first positive sub-lens-unit P1 , a first negative sub-... | 08/16/1994 |
| 5331464 | Zoom lens system A zoom lens system comprises, in order from the object side, a negative first lens group N, a diaphragm stop A, a positive second lens group P and a blocking element B for blocking deleterious rays of light, with the first and second lens groups N and P m... | 07/19/1994 |
| 5329329 | Zoom lens barrel unit with lens group moving means and movement guiding means axially juxtaposed to enhance barrel compactness A lens barrel unit for a zoom lens camera which is more compact in the axial optical direction in the retracted state because the lens group moving means and linear movement guiding means are juxtaposed along the optical axis. The lens barrel unit also ha... | 07/12/1994 |
| 5329402 | Wide-angle zoom lens A small-sized and bright wide-angle zoom lens having a variable power ratio on the order of 2 at a field angle of approximately 84° and constructed of a small number of constructional lens. The wide-angle zoom lens, sequentially from an object, comprises... | 07/12/1994 |
| 5321553 | Zoom lens In a zoom lens having a lens unit of negative refractive power most adjacent to the object side, distortion can be corrected better and an excellent imaging performance is maintained. In a zoom lens having a lens unit of negative refractive power most adj... | 06/14/1994 |
| 5319495 | Zoom lens A zoom lens includes, from the image side to the subject side, a first lens group having a negative overall power and a second lens group having a positive overall power. The lens groups are movable relative to each other in opposite directions so as to i... | 06/07/1994 |
| 5311355 | Afocal zooming optical system An afocal zooming optical system includes, in order from the object side, an objective optical unit comprising a positive first lens group, an erecting prism component and a negative second lens group, and an eyepiece optical unit comprising a three-eleme... | 05/10/1994 |
| 5309278 | Real-image variable magnification finder including a light shield between two moving lens groups A real-image variable magnification finder is capable of blocking deleterious rays of light without increasing the lens diameter or the size of the erecting prism even of the view angle is large. The improved finder includes, in order from the object side... | 05/03/1994 |
| 5309285 | Zoom lens system for use with a compact camera A zoom lens system for use with a compact camera comprises, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length and which performs zooming by changing the distance between... | 05/03/1994 |
| 5283693 | Compact zoom lens system A compact zoom lens system comprises a front negative lens component and a rear positive lens component with a variable air space between the front and the rear lens components. The front negative lens component consists of two lens elements and the rear ... | 02/01/1994 |
| 5280390 | Zoom lens system A zoom lens system includes, in order from the object side, the first lens group having a positive focal length and the second lens group having a negative focal length. The system performs zooming by changing the distance between the first and second len... | 01/18/1994 |
| 5247394 | Reading zoom lens system The improved reading zoom lens system includes, in order from the object side, a front group that has a positive power and that is of a four-unit-six-element composition and a rear group that has a positive power and that is composed of two elements, whic... | 09/21/1993 |
| 5214538 | Optical apparatus A laser beam is projected through the optical system of an endoscope and scanned in raster fashion by means of a scanning head at a proximal end of the endoscope tube. The beam is projected from a distal end of the endoscope tube so as to be scanned over ... | 05/25/1993 |
| 5182673 | Zoom lens having high variable magnification In a zoom lens having a high variable magnification, first and second lens groups and respectively having negative and positive focal lengths are sequentially arranged from an object side of the zoom lens to an image side thereof. A combined focal length ... | 01/26/1993 |
| 5179473 | Zoom lens A zoom lens includes, in succession from the greatly conjugate side to the little conjugate side, a first lens unit having negative refractive power, and a second lens unit having positive refractive power. Zooming from the wide angle side to the telephot... | 01/12/1993 |
| 5177639 | Stop device for zoom lens A stop device for a zoom lens includes an aperture-stop provided between a front lens group and a rear lens group. The front lens group, the rear lens group, and the aperture-stop are moved relative to each other by a motor, to carry out a zooming operati... | 01/05/1993 |
| 5175649 | Zoom lens system A zoom lens system comprising, in the order from the object side, a front lens unit having a negative refractive power as a whole and a rear lens unit having a positive refractive power as a whole; and said rear lens unit comprising a first positive lens ... | 12/29/1992 |
