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1. 发明授权

US5414460A Mechanical aperture for controlling illumination level 失效
公开(公告)号：US5414460A
公开(公告)日：1995-05-09
申请号：US73820
申请日：1993-06-08
申请人： Thomas Niertit , James D. Mckay , Raymond L. Dewolf , Richard J. Sandor
发明人： Thomas Niertit , James D. Mckay , Raymond L. Dewolf , Richard J. Sandor
IPC分类号： G03B27/50 , G03B9/06 , H04N5/253 , H04N5/238
CPC分类号： H04N5/253 , G03B9/06
摘要： In an illumination system for a film telecine scanner of the type adapted to provide a line of illumination on the image frames of a film which is supported for rapid movement in a film gate of the scanner, an improved light control system for adjusting the amount of light that is delivered from a light source to an integrating cylinder to take into account fluctuations in intensity of the light source and desired intensity changes in the line of illumination upon a change of scene in the image frames of the film as the film is being scanned. The light control system includes aperture defining apparatus for selectively adjusting the amount of light entering said integrating cylinder in response to the commanded light intensity signal within the time span of scanning a single image frame of the film. The aperture setting apparatus comprises a housing containing a continuous, single piece, elongated band having first and second centrally disposed light obstructing or solid band sections formed in parallel planes with respect to one another and first and second light transmitting or cut-out band sections separating the first and second light obstructing band sections and forming end loops of the elongated band, the first and second shaped leading edges formed as edges of the first and second light obstructing band sections defining one side of the first and second respective light transmitting band sections which face one another and interrupt the light beam in near the same plane as the first and second light obstructing band sections are moved in parallel with respect to one another and the opening. In order to support and move the elongated band, a tension and return idler assembly supported by the housing engages and provide rotational and tensioning support for the end loop of the first light transmitting section. A motor drive assembly supported by the housing engages and provide rotational driving force to the end loop of the second light transmitting section. Idlers supported by the housing means guide the first light obstructing band section into closely spaced parallel relationship with the second light obstructing band section.

2. 发明授权

US4922089A Constant color temperature and intensity illumination source 失效
标题翻译：恒定色温照明源
公开(公告)号：US4922089A
公开(公告)日：1990-05-01
申请号：US279628
申请日：1988-12-05
申请人： Kevin P. McGuire , James D. McKay
发明人： Kevin P. McGuire , James D. McKay
IPC分类号： G03C5/08 , F21S10/00 , F21V23/04 , G01J1/08 , G01J5/60 , G03B27/54 , G03B27/73
CPC分类号： H05B37/02 , F21S10/00 , F21V23/0442 , F21V23/0457 , G01J1/08 , G01J5/60
摘要： A source of illumination of constant color temperature and intensity including a lamp the color temperature of the light from which is dependent on the power applied to the lamp. There is a device for measuring the intensity of portions of the spectrum of the light and for providing signals indicative of those intensities. Means responsive to the signals adjust the power to achieve the selected color temperature. A light modulator adjusts the intensity without affecting color temperature. There is a spherical mirror centered on the lamp and the modulator is located between the lamp and the mirror and controls the brightness of the image of the lamp formed on the lamp by the spherical mirror.

3. 发明授权

US4894683A Variable brightness light generators 失效
标题翻译：可变亮度发光二极管
公开(公告)号：US4894683A
公开(公告)日：1990-01-16
申请号：US279623
申请日：1988-12-05
申请人： Kevin P. McGuire , James D. McKay
发明人： Kevin P. McGuire , James D. McKay
IPC分类号： G03C5/02 , G03B27/54 , G03B27/72
CPC分类号： G03B27/72
摘要： There is disclosed a variable brightness light generator embodied in apparatus for exposing photographic film for test purposes. The generator includes a spherical mirror, a lamp at the center of the spherical form of the mirror and a modulator located between the lamp and the mirror for modulating the brightness of the image of the lamp created on the lamp by the mirror. The intensity of the light issuing from the lamp is sensed by a spectroradiometer which produces signals used in controlling the modulator whereby the intensity may be kept constant. The color temperature of the lamp is controlled under the influence of signals from the spectroradiometer. The exposing apparatus also includes a plurality of filters selectively insertable in the light path for modifying the intensity and color of the light incident on the film.

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