| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | Infrared neutral-density filter having copper alloy film | US506693 | 1995-07-25 | US5726797A | 1998-03-10 | Zhuomin M. Zhang; Raju U. Datla; Leonard M. Hanssen |
| A neutral-density optical filter has a dielectric substrate and a film costing essentially of copper and nickel. The film is preferably formed of Constantan, which is 55% copper and 45% nickel. The filter achieves a high optical density with a low spectral variation. | ||||||
| 42 | Broad band nonreflective neutral density filter | US389545 | 1989-08-04 | US4960310A | 1990-10-02 | David H. Cushing |
| A broad band low reflectance neutral density optical filter. A neutral density filter having substantially flat transmittance and low reflectivity over a wide range of wavelengths from the ultraviolet through the visible region of the spectrum includes a transparent substrate, two successive layers of different dielectric materials on the substrate, at least two layers of metallic material, each metallic layer being separated from the preceding metallic layer by a layer of dielectric material, and finally, two succeeding layers of different dielectric mateials. The resultant neutral density filter thus has two layers of different dielectric materials between the substrate and the first layer of metallic material, and two layers of different dielectric materials between the atmosphere and the final layer of metallic material. This construction provides physical and spectral stability, relatively constant transmittance as a function of wavelength, and low reflectivity from both sides of the filter as a function of wavelength, which in turn permits a number of filters of the invention to be employed in series. | ||||||
| 43 | Digitally graded neutral density filter | US13039444 | 2011-03-03 | US08780241B2 | 2014-07-15 | Richard Scott Johnson |
| Apparatus and a method for performing neutral density filtering in a digital camera. The camera includes a pixel array having rows and columns of pixels. The pixels in the array may be reset and read with variable timing between the reset operation and the read operation. The timing between the reset and read operations is controlled to implement a neutral density filtering operation. | ||||||
| 44 | CRT having internal neutral density filter field of use | US10223571 | 2002-08-19 | US06960873B2 | 2005-11-01 | Himanshu Mukundray Patel |
| A novel CRT and method of making the CRT are disclosed. The CRT comprises an internal neutral density filter that lies between the phosphor deposits and the interior surface of the faceplate panel. The filter enhances the contrast of the CRT without compromising center to edge brightness ratio of the CRT. The filter comprises very fine particles, wherein the particles are black, gray, or a mixture of black and gray. The filter reduces the absorption of the faceplate by 25 to 75%. The invention is particularly useful for substantially flat CRTs. The method of producing the novel CRT comprises the steps of preparing a suspension of well-dispersed light-absorbing, carbon-containing particles which are 0.05 to 2 microns in aqueous media and applying the suspension onto the interior surface of the faceplate panel prior to applying at least one phosphor deposit. The suspension may also include suitable organic and inorganic binders and dispersing and wetting agents. | ||||||
| 45 | Optical neutral controllable density filter | US25954563 | 1963-02-19 | US3291554A | 1966-12-13 | PRICE EDGAR E |
| 46 | CRT having internal neutral density filter field of use | US10223571 | 2002-08-19 | US20040032199A1 | 2004-02-19 | Himanshu Mukundray Patel |
| A novel CRT and method of making the CRT are disclosed. The CRT comprises an internal neutral density filter that lies between the phosphor deposits and the interior surface of the faceplate panel. The filter enhances the contrast of the CRT without compromising center to edge brightness ratio of the CRT. The filter comprises very fine particles, wherein the particles are black, gray, or a mixture of black and gray. The filter reduces the absorption of the faceplate by 25 to 75%. The invention is particularly useful for substantially flat CRTs. The method of producing the novel CRT comprises the steps of preparing a suspension of well-dispersed light-absorbing, carbon-containing particles which are 0.05 to 2 microns in aqueous media and applying the suspension onto the interior surface of the faceplate panel prior to applying at least one phosphor deposit. The suspension may also include suitable organic and inorganic binders and dispersing and wetting agents. | ||||||
| 47 | 吸收型多層膜中性密度濾光片 ABSORPTION TYPE MULTI-LAYER FILM NEUTRAL DENSITY FILTER | TW094123480 | 2005-07-12 | TWI372888B | 2012-09-21 | 大上秀晴; 阿部能之; 中山德行 |
| 本發明之吸收型多層膜中性密度濾光片，其係具有一基板、及由以鎳(Ni)為主成份之金屬層和各由SiO2、Al2O3或其混合物中之任一者所形成之介電質層交替積層在該基板1上所構成之光學多層體7的結構，由於在該金屬層中係使用在可見光域的分光透射率之波長相依性小的Ni系金屬材料作為光衰減層，因此可實現獲得對波長呈平坦的透射率衰減之中性密度濾光片。 | ||||||
| 48 | Image pickup apparatus having a movably controllable neutral-density filter | US11782026 | 2007-07-24 | US07852400B2 | 2010-12-14 | Takeshi Ikeda |
| An image pickup apparatus which is capable of preventing light diffraction from being caused by a density step or a thickness step of a filter, thereby preventing degradation of resolution during still image shooting, and securing the dynamic range of exposure control during both moving image shooting and still image shooting. In the image pickup apparatus, an image pickup element converts light incident thereon from a lens into an electric signal. A diaphragm mechanism changes the amount of light incident on the image pickup element. An ND filter covers an aperture of the diaphragm mechanism such that the aperture can be opened and closed, thereby adjusting the amount of light incident on the image pickup element after passing through the aperture. A controller controls a closing operation of the ND filter for closing the aperture, such that the closing operation is performed at different speeds between when a gradation portion of the ND filter covers the aperture and when a transparent portion of the ND filter covers the aperture. | ||||||
| 49 | Cathode ray tube having an internal neutral density filter | US10375416 | 2003-02-27 | US06819040B2 | 2004-11-16 | Farzad Parsapour; Bhanumurthy Venkatrama Subrahmanya Gunturi; Steven Anthony Colbert; Brian Thomas Collins |
| A composition and method of forming an internal neutral density filter on a luminescent screen assembly of a cathode ray tube (CRT) is disclosed. The luminescent screen assembly is formed on an interior surface of a glass faceplate panel of the CRT tube. The luminescent screen assembly includes a patterned light-absorbing matrix that defines three sets of fields corresponding to one of a blue region, a green region and a red region. An internal neutral density filter is formed on the light-absorbing matrix. An array of blue, green and red color phosphors is formed on the internal neutral density filter corresponding to one of the blue region, the green region and the red region defined in the light-absorbing matrix. The internal neutral density filter has a composition including a red pigment, a blue pigment and at least one non-pigmented oxide particle. | ||||||
| 50 | Neutral density filter element with reduced surface reflection | US3781089D | 1971-08-02 | US3781089A | 1973-12-25 | FAY R; CICOTTA J |
| A neutral density filter element for use with photographic apparatus is formed by depositing alternate layers of a metal or metal alloy and a dielectric on a transparent substrate, to a predetermined optical density or reflectivity respectively. The initial and final layers are of the metal or metal alloy. The dielectric layer has a lower index of refraction than the metal or metal alloy layer. In the preferred embodiment Inconel is used as the metal alloy layer and silicon monoxide as the dielectric layer.
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| 51 | Imaging optical system with a neutral density filter, camera and personal digital assistant | EP10251488.2 | 2010-08-24 | EP2290440B1 | 2018-04-04 | Nakayama, Takahiro; Sudoh, Yoshifumi |
| An imaging optical system includes an aperture stop, a first lens group disposed on an object side of the aperture stop, a second lens group disposed on an image side of the aperture stop and a plate-like ND filter disposed close to a position of the aperture stop in an optical axis direction of the first and second lens groups, and the second lens group includes positive refracting power as a whole, the ND filter is configured to be retractable from the optical axis, and to attenuate a passing light amount. | ||||||
| 52 | Strip neutral density filter for correcting intensity non-uniformity in a raster output scanning system | EP02021398.9 | 2002-09-24 | EP1300699A2 | 2003-04-09 | Wang, Mark Shi |
A strip neutral density filter varies the Gaussian intensity profile of the modulated light beam in an overfilled raster output scanner to provide a generally uniform intensity light beam spot at the photosensitive medium. The strip neutral density filter is positioned in the light beam path between the emitting laser source and the rotating polygon mirror of the raster output scanner. |
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| 53 | Solar cell characterization system with an automated continuous neutral density filter | US13039940 | 2011-03-03 | US08797058B2 | 2014-08-05 | Oki Gunawan; Bao Lei |
| Techniques for solar cell electrical characterization are provided. In one aspect, a solar testing device is provided. The device includes a solar simulator; and a continuous neutral density filter in front of the solar simulator having regions of varying light attenuation levels ranging from transparent to opaque, the continuous neutral density filter having an area sufficiently large to filter all light generated by the solar simulator, and wherein a position of the continuous neutral density filter relative to the solar simulator is variable so as to control a light intensity produced by the device. A solar cell electrical characterization system and a method for performing a solar cell electrical characterization are also provided. | ||||||
| 54 | Portal imaging assembly with laminated neutral density filter and method of use | US09894553 | 2001-06-28 | US06485880B1 | 2002-11-26 | Robert E. Dickerson; William E. Moore |
| A radiographic imaging assembly has first and second radiographic silver halide films in association with two fluorescent intensifying screens. Between one set of screen and film is a neutral density filter having a density of at least 0.3 to provide with improved exposure latitude for use in various exposure conditions and equipment. The neutral density filter comprises a transparent support having a hydrophilic neutral density filter layer disposed thereon, which layer includes sufficient silver metal, colloidal carbon, or exposed and processed silver halide in a hydrophilic binder to provide the desired density. The neutral density filter is laminated to one of the screens with its hydrophilic layer in contact with the screen. | ||||||
| 55 | Portal imaging assembly with neutral density filter and method of use | US09893955 | 2001-06-28 | US06482563B1 | 2002-11-19 | Robert E. Dickerson; William E. Moore |
| A radiographic imaging assembly has first and second radiographic silver halide films in association with two fluorescent intensifying screens. Disposed between one set of screen and film is a neutral density filter having a density of at least 0.3 to provide improved exposure latitude for use in various exposure conditions and equipment. | ||||||
| 56 | Solar cell characterization system with an automated continuous neutral density filter | US14309573 | 2014-06-19 | US09523732B2 | 2016-12-20 | Oki Gunawan; Bao Lei |
| Techniques for solar cell electrical characterization are provided. In one aspect, a solar testing device is provided. The device includes a solar simulator; and a continuous neutral density filter in front of the solar simulator having regions of varying light attenuation levels ranging from transparent to opaque, the continuous neutral density filter having an area sufficiently large to filter all light generated by the solar simulator, and wherein a position of the continuous neutral density filter relative to the solar simulator is variable so as to control a light intensity produced by the device. A solar cell electrical characterization system and a method for performing a solar cell electrical characterization are also provided. | ||||||
| 57 | Exposure device with spatial light modulator and neutral density filters | US10556876 | 2004-05-03 | US07292314B2 | 2007-11-06 | Thierry Prigent |
| Exposure device for writing mixed data onto a photosensitive support comprising: a light source (10), supplying an exposure light; a first two-dimension pixel matrix modulator (50), and a neutral optical filter means (12) having at least two different optical densities, the modulator and the filter being arranged in series on an optical path of the exposure light coming from the source (10). Application to motion picture cameras. | ||||||
| 58 | Exposure device with spatial light modulator and neutral density filters | US10556876 | 2004-05-03 | US20060221321A1 | 2006-10-05 | Thierry Prigent |
| Exposure device for writing mixed data onto a photosensitive support comprising: a light source (10), supplying an exposure light; a first two-dimension pixel matrix modulator (50), and a neutral optical filter means (12) having at least two different optical densities, the modulator and the filter being arranged in series on an optical path of the exposure light coming from the source (10). Application to motion picture cameras. | ||||||
| 59 | Monochrome pixellated display with improved gradation scale by use of subpixels with neutral density filters having binary scale of transmittance values | EP02008261.6 | 2002-04-19 | EP1251480A2 | 2002-10-23 | Ohashi, Mitsuo; Kawaguchi, Fumio; Ueda, Katsue; Kurisu, Motohiro |
There is provided a two-dimensional monochrome bit face display having its luminance resolution equal to or higher than that of a CRT monitor. In a two-dimensional monochrome bit face display having its bit face in which each of pixels is constituted by m sub-pixels (where m is an integer equal to or greater than 3), ND filters transmitting light to the m sub-pixels in the proportion of values, represented by percentage, of respective terms of a power series of 1/2n (where n is an integer from 0 to m-1) or in the proportion of approximate values thereof, or mask filters transmitting light in the same proportion are mounted on the m sub-pixels constituting each of the pixels, respectively. Alternatively, areas of the m sub-pixels are set in the same proportion. Luminance of each sub-pixel is electronically controlled to improve the luminance resolution of the bit face display. |
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| 60 | Monochrome pixellated display with improved gradation scale by use of subpixels with neutral density filters having binary scale of transmittance values | EP02008261.6 | 2002-04-19 | EP1251480A3 | 2004-01-02 | Ohashi, Mitsuo; Kawaguchi, Fumio; Ueda, Katsue; Kurisu, Motohiro |
There is provided a two-dimensional monochrome bit face display having its luminance resolution equal to or higher than that of a CRT monitor. In a two-dimensional monochrome bit face display having its bit face in which each of pixels is constituted by m sub-pixels (where m is an integer equal to or greater than 3), ND filters transmitting light to the m sub-pixels in the proportion of values, represented by percentage, of respective terms of a power series of 1/2n (where n is an integer from 0 to m-1) or in the proportion of approximate values thereof, or mask filters transmitting light in the same proportion are mounted on the m sub-pixels constituting each of the pixels, respectively. Alternatively, areas of the m sub-pixels are set in the same proportion. Luminance of each sub-pixel is electronically controlled to improve the luminance resolution of the bit face display. |
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