1
Wilhelmus A G Timmers: Image projection system with autofocusing. U S Philips Corporation, Norman N Spain, March 21, 1995: US05400093 (52 worldwide citation)

An image projection device comprising at least one display panel (26, 27, 28), a projection lens system (C) and a focus error detection system (FS) is described. Since the radiation source (50) and the radiation-sensitive detector (51) of the focus error detection system are arranged in planes which ...


2
Shmuel Shaffer, William Joseph Beyda: Apparatus and method for focusing a projected image. Siemens Information and Communication Networks, April 18, 2000: US06050690 (37 worldwide citation)

An apparatus and method controlling a projected image (24) is provided. The apparatus (10) includes a detector (16) that tracks a visual pointer (22) appearing on a projection screen (20). The visual pointer (22) is positioned on the image (24) by a viewer. The visual pointer (22) can be generated b ...


3
Nozomu Kitagishi, Shoji Suzuki, Shuichiro Saito, Masaharu Suzuki, Koutaro Yano, Toru Matsuda, Makoto Taniguchi: Projection optical apparatus comprising automatic adjustment unit. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, July 16, 1996: US05537168 (21 worldwide citation)

In a projection type display apparatus for illuminating a projection original image with light from a projection light source, and projecting light transmitted through the illuminated original image using a projection lens, light reflected by a projection surface is extracted from a position at an o ...


4
Akihiro Fujiwara: Optical apparatus in which image distortion is removed. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, October 3, 1995: US05455647 (21 worldwide citation)

An optical apparatus including an optical assembly having an image formation optical system and a device for receiving an image, said optical assembly including optical components disposed along an optical axis for projecting the image to a display surface, a detecting device for detecting each dist ...


5
Lang Walter: Method of and device for the automatic focusing of microscopes. Carl Zeiss Stiftung, March 20, 1973: US3721759 (21 worldwide citation)

The invention contemplates a method and means whereby critical focus can be automatically achieved in a microscope, using TV scanning of the imaged object while the focused condition of the microscope is varied. As its criterion for critical focus, the invention in a preferred form uses a minimum-le ...


6
Lee Nam Su, Sim Dae Sul: System for adjusting a size of an image projected on a sloped surface. LG Electronics, Finnegan Henderson Farabow Garrett & Dunner L, December 17, 1996: US05584552 (20 worldwide citation)

To correct the size of an image projected on a screen surface that is at an oblique angle to a line of projection of a projector, the image is corrected by manual or automatic angular position adjustment of a LCD panel or a mirror. A device for adjusting the image size includes a detector for projec ...


7
Heaney Paul R, Strubel Gad E: Automatic ranging and focusing projector. Eastman Kodak Company, February 1, 1972: US3639048 (15 worldwide citation)

A projector having an optical ranging system for automatically optically sensing the screen-to-lens distance and in response thereto establishing a predetermined film-to-lens distance for placing a projected film image in focus. The projector further has an optical focusing system operative in conju ...


8
Sturdevant Eugene J: Automatic component positioning device for optical system. Display Enterprises, Connolly and Hutz, November 4, 1975: US3917394 (11 worldwide citation)

An optical projection lens tube comprises the armature of a linear induction motor. The surrounding field coils are connected to a semiconductor bridge network, which drives the armature in either of two directions in response to a signal obtained from an error detector and connected through a servo ...


9
Fujishi Shigeo: Manual focus equipment. Fuji Photo Film, February 5, 2004: JP2004-040740 (9 worldwide citation)

PROBLEM TO BE SOLVED: To perform focus adjustment in reference to a focus status displayed based on misalignment of images picked up while moving a diaphragm in a direction perpendicular to an optical axis.SOLUTION: An aperture diaphragm is provided, which can be shifted right and left on an object ...


10
Harvey Donald M: Automatic focusing mechanism for a lap dissolve projector. Company Eastman Kodak, August 24, 1971: US3601482 (9 worldwide citation)

A lap dissolve projector having mechanism for automatically focusing film images in a pair of film projection lens systems for maintaining a constant lens-to-film distance for each system in which the film image is in focus. An optical focusing system for each film comprises a lens for focusing a ra ...