File:InFocus LP425z Single Chip DLP - 4-segment color wheel - Green Blue.JPG
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Captions
Summary
[edit]DescriptionInFocus LP425z Single Chip DLP - 4-segment color wheel - Green Blue.JPG |
English: Internal components of an old 1998 InFocus LP425z single-chip DLP projector, with a 4-segment color wheel. This older 4-segment RGB+gray wheel design has a tendency to produce really poor yellows that are dark and greenish. Newer color wheels contain more segments with other colors to help improve the color gamut. The glass segment shape is rather odd.. the exterior edge is circular, but the interior edge doesn't match the hub curvature at all. As the non-expert uploading this image I cannot explain the reason for that design. (COMMENT: The reason for this may be because of the way the glass may have been cut from a larger sheet. Two tight curves would make it quite likely to split.) To the right is the cone-shaped light input from the lamp with a domed fisheye lens in the center. This lens works like a doorway spyhole except in reverse. Light enters as a narrowing cone, and the fisheye straightens the light into a tight beam about 5mm in diameter traveling in a parallel beam, under the main lens towards a front-surfaced mirror. The fat pins around the edge of the cone are used to correctly align the lamp assembly that is inserted by the projector user. |
Source | Own work |
Author | DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:22, 28 May 2009 | 3,648 × 2,736 (4.09 MB) | DMahalko (talk | contribs) | {{Information |Description={{en|1=Internal components of an old 1998 InFocus LP425z single-chip DLP projector, with a 4-segment color wheel.}} |Source=Own work by uploader |Author=DMahalko |Date= |Permission= |other_versions= }} <!--{{I |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A640 |
Exposure time | 1/8 sec (0.125) |
F-number | f/2.8 |
Date and time of data generation | 20:41, 27 May 2009 |
Lens focal length | 7.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 20:41, 27 May 2009 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 20:41, 27 May 2009 |
Image compression mode | 5 |
APEX shutter speed | 3 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 12,710.801393728 |
Focal plane Y resolution | 12,725.581395349 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |