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Class Information
Number: 359/888
Name: Optical: systems and elements > Absorption filter > Neutral or graded density
Description: Subject matter wherein the filter or a portion thereof absorbs ray energy independently of wavelength and the corresponding transmittance may be uniform or variable.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7483226 |
ND filter, manufacturing method thereof, and aperture device |
Jan. 27, 2009 |
| 7440204 |
ND filter of optical film laminate type with carbon film coating |
Oct. 21, 2008 |
| 7440205 |
Variable intensity dimmer |
Oct. 21, 2008 |
| 7436449 |
Electronic imaging system |
Oct. 14, 2008 |
| 7428051 |
Device for the IR-spectrometric analysis of a solid, liquid or gaseous medium |
Sep. 23, 2008 |
| 7388723 |
ND filter and light quantity diaphragming device including the same |
Jun. 17, 2008 |
| 7294360 |
Conformal coatings for micro-optical elements, and method for making the same |
Nov. 13, 2007 |
| 7295391 |
ND filter for aperture device and aperture device comprising ND filter |
Nov. 13, 2007 |
| 7239464 |
Absorption type multi-layer film ND filter |
Jul. 3, 2007 |
| 7230779 |
ND filter and aperture diaphragm apparatus |
Jun. 12, 2007 |
| 7189014 |
Production process of light amount-adjusting member, light amount-adjusting member, light amount-adjusting device and photographing apparatus |
Mar. 13, 2007 |
| 7110195 |
Monolithic hard pellicle |
Sep. 19, 2006 |
| 7042662 |
Light amount adjusting device, and optical device using the light amount adjusting device |
May. 9, 2006 |
| 7027238 |
Method and apparatus for color-neutral brightness regulating of a light source |
Apr. 11, 2006 |
| 7019917 |
Lens barrel |
Mar. 28, 2006 |
| 7016129 |
Optical filter, method of making optical filter, light amount adjusting apparatus and optical equipment |
Mar. 21, 2006 |
| 6963437 |
Devices incorporating electrochromic elements and optical sensors |
Nov. 8, 2005 |
| 6952314 |
Method of manufacturing ND filter, and aperture device and camera having ND filter |
Oct. 4, 2005 |
| 6932472 |
Dual complementary two-color optics which enables a user to see true neutral color, with improved shading design and shadow detail |
Aug. 23, 2005 |
| 6891686 |
Medium for a color changer |
May. 10, 2005 |
| 6879451 |
Neutral density color filters |
Apr. 12, 2005 |
| 6866431 |
Light amount adjustment apparatus, manufacturing method, and photographing apparatus |
Mar. 15, 2005 |
| 6842302 |
ND filter, method for producing the ND filter, and aperture device including the ND filter |
Jan. 11, 2005 |
| 6842301 |
ND filter and aperture device including the same |
Jan. 11, 2005 |
| 6836610 |
Electrical variable optical attenuator |
Dec. 28, 2004 |
| 6812979 |
Color-separating apparatus for liquid crystal projector of single panel type |
Nov. 2, 2004 |
| 6778337 |
Optical attenuator and optical attenuator module |
Aug. 17, 2004 |
| 6771315 |
Image pickup apparatus |
Aug. 3, 2004 |
| 6678100 |
Dual complementary two-color optics which enables a user to see true neutral color |
Jan. 13, 2004 |
| 6674587 |
Antiglare optical device |
Jan. 6, 2004 |
| 6671109 |
ND filter having composite PVD film of metal and its oxide |
Dec. 30, 2003 |
| 6654188 |
Compositions and devices for thermo optically controlled switching and filtering |
Nov. 25, 2003 |
| 6639723 |
Variable optical attenuator with polarization compensation |
Oct. 28, 2003 |
| 6623142 |
Method and apparatus for correcting optical non-uniformities in a light emitting diode |
Sep. 23, 2003 |
| 6553175 |
Variable optical attenuator |
Apr. 22, 2003 |
| 6545828 |
Optical device with absorption gradient and selective spectral filtering and lens assembly and camera fitted with such a device |
Apr. 8, 2003 |
| 6545829 |
Method and device for improved lithographic critical dimension control |
Apr. 8, 2003 |
| 6538830 |
Method and device for improved lithographic critical dimension control |
Mar. 25, 2003 |
| 6481851 |
Adjustable contrast reflected display system |
Nov. 19, 2002 |
| 6480662 |
Design of a variable attenuator and fabrication of its shutter element |
Nov. 12, 2002 |
| 6414804 |
Converging optical system for laser beam source |
Jul. 2, 2002 |
| 6411451 |
Laser protection system |
Jun. 25, 2002 |
| 6373615 |
Neutral-colored gray photochromic plastic object |
Apr. 16, 2002 |
| 6371662 |
Spatially variable filter laser wavelength monitoring/control |
Apr. 16, 2002 |
| 6303937 |
Ceramic calibration filter |
Oct. 16, 2001 |
| 6278522 |
Optical filter for spectroscopic measurement and method of producing the optical filter |
Aug. 21, 2001 |
| 6278563 |
Scrolling color changer |
Aug. 21, 2001 |
| 6266198 |
Consolidated laser alignment and test station |
Jul. 24, 2001 |
| 6262829 |
Method of digital grayscale control using modulation of a slow-acting light source |
Jul. 17, 2001 |
| 6218194 |
Analytical methods and apparatus employing an optical sensor device with refractive index modulation |
Apr. 17, 2001 |
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