1. A light emitting diode (LED) lamp, comprising:
a reflecting cover having a reflecting portion formed by rotating a half-parabola around a Y-axis to obtain a plurality of half-parabolas on the reflecting portion, a plurality of whole parabolas each of which has a corresponding half-parabola having a vertex and a focal point located on an X-axis perpendicular to the Y-axis, the half-parabola extending from the vertex to the Y-axis, the focal points of the parabolas forming an arc-shaped trajectory, the vertexes of the parabolas forming an arc and defining a first open side of the reflecting cover, and two outmost half-parabolas of the reflecting portion forming a second open side of the reflecting cover;
a substrate coupling to and sealing the first open side of the reflecting cover;
a transparent sealing cover coupling to and sealing the second open side of the reflecting cover;
a mounting base being received in a sealed space defined among the substrate, the sealing cover, and the reflecting cover, the trajectory being located on an outer surface of the mounting base; and
a plurality of LEDs located on the trajectory and facing the reflecting cover, light emitted by the plurality of the LEDs travelling to the reflecting portion of the reflecting cover and then being reflected parallelly therefrom to the sealing cover.
2. The LED lamp of claim 1, wherein a plurality of lenses are arranged on an outer side of the sealing cover.
3. The LED lamp of claim 2, wherein the plurality of lenses are integrally formed with the sealing cover and are evenly spaced from each other.
4. The LED lamp of claim 1, wherein the mounting base is semi-conical, and comprises a triangular-shaped side surface and an arc-shaped mounting surface facing the reflecting portion, the trajectory being located on the mounting surface of the mounting base.
5. The LED lamp of claim 4, wherein the side surface of the mounting base abuts an inner side of the sealing cover opposite to the outer side.
6. The LED lamp of claim 1, wherein the reflecting portion is formed by rotating the half-parabola for 180 degrees around the Y-axis.
7. The LED lamp of claim 1, wherein the reflecting cover further comprises a connecting portion extending from the arc of the reflecting portion to the substrate, the substrate being semi-circular, the sealing cover being arranged on a linear-shaped side of the substrate, and the reflecting cover being arranged on an arc-shaped side of the substrate.
8. The LED lamp of claim 1, wherein the first open side is perpendicular to the second open side.
9. An LED lamp, comprising:
a reflecting portion formed by rotating a half-parabola around a Y-axis to obtain a plurality of half-parabolas on the reflecting portion, the half-parabola having a vertex and a focal point located on an X-axis perpendicular to the Y-axis, and extending from the vertex to the Y-axis, the focal points of the half-parabolas of the reflecting portion forming an arc-shaped trajectory; and
at least one LED located on the trajectory and confronting to the reflecting portion, light emitted from the at least one LED being reflected by the reflecting portion as parallel light.
10. The LED lamp of claim 9, wherein a first open side is formed at a bottom side of the reflecting portion by the vertexes of the half-parabolas of the reflecting portion, and a second open side is formed at a lateral side of the reflecting portion by two outmost half-parabolas of the reflecting portion, the second open side being perpendicular to the first open side, the parallel light reflected by the reflecting portion travelling to ambient through the second open side of the reflecting portion.
11. The LED lamp of claim 10, wherein the half-parabola rotates 180 degree around the Y-axis to form the reflecting portion, and the two outmost half-parabolas of the reflecting portion are coplanar with the Y-axis.
12. The LED lamp of claim 10, wherein a transparent sealing cover couples to and seals the second open side, the sealing cover having an inner side facing the reflected parallel light, and an outer side opposite to the inner side, a plurality of lenses being arranged on the outer side of the sealing cover.
13. The LED lamp of claim 12, wherein a mounting base being arranged at the first open side of the reflecting potion, the mounting base being semi-conical, and comprising a triangular-shaped side surface and an arc-shaped mounting surface facing the reflecting portion, the trajectory being located on the mounting surface of the mounting base.
14. The LED lamp of claim 13, wherein a substrate couples to and seals the first open side of the reflecting portion, the sealing cover and the reflecting portion being arranged on an outer periphery of the substrate, and the mounting base being arranged on the substrate with the side surface thereof abutting the inner side of the sealing cover.
15. The LED lamp of claim 14, wherein a connecting portion extends from the bottom open side of the reflecting portion to the substrate to assemble the reflecting portion to the substrate.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of printer operation comprising:
generating with an optical sensor having a plurality of detectors first image data of a surface of a rotating member while the surface is bare of ink, the rotating member being positioned to rotate in front of at least one printhead to form an ink image on the surface of the rotating member;
operating the at least one printhead to eject ink onto the surface of the rotating member with reference to data stored in the printer;
generating second image data of the surface of the rotating member while the ejected ink corresponding to the data stored in the printer is on the surface of the rotating member;
aligning the first image data with the second image data;
reducing noise in the second image data with reference to the first image data aligned with the second image data;
processing the second image data having reduced noise to identify the ejected ink on the surface of the rotating image member; and
operating the printer with reference to the ejected ink identified on the surface of the rotating image member.
2. The method of claim 1 further comprising:
identifying an offset for each detector in the optical sensor in a printer that is positioned to generate image data of the surface of the rotating member; and
removing the offset from the second image data before reducing the noise in the second image data.
3. The method of claim 2, the identification of the offset for each detector further comprising:
deactivating a light source positioned to illuminate the surface of the rotating member; and
generating third image data of the surface of the rotating member, the third image data corresponding to the offsets identified for the detectors in the optical sensor.
4. The method of claim 1 further comprising:
operating the detectors of the optical sensor at a maximum sampling period.
5. The method of claim 1, the alignment of the first image data and the second image data further comprising:
selecting a first area of image data in the first image data that is outside an area in the first image data that can be printed by the at least one printhead;
selecting a second area of image data in the second image data that is outside an area in the second image data that can be printed by the at least one printhead;
measuring cross-correlation between the selected first area of image data and the selected second area of image data;
continuing to select another area of image data in the first image data that is outside the area in the first image data that can be printed by the at least one printhead and measuring cross-correlation between the selected other area of image data and the second area of image data until a predetermined number of areas are selected;
identifying one of the selected areas in the first image data as being aligned with the second area of image data in the second image data in response to the cross-correlation measurement between the identified one of the selected areas in the first image data and the selected second areas of image data in the second image data being a minimum for the cross-correlations measured for the predetermined number of selected areas; and
identifying a first area of image data within an area in the first image data that can be printed by the at least one printhead with reference to the identified one selected area, the identified first area of image data within the area in the first image data that can be printed by the at least one printhead being used to reduce noise in image data in the second image data that is within an area of the second image data that can be printed by the at least one printhead that corresponds to the selected second area of image data in the second image data.
6. The method of claim 5 further comprising:
continuing to select another second area of image data in the second image data and measuring a plurality of cross-correlations between the selected other area of image data in the second image data and a predetermined number of selected areas of image data in the first image data until each selected area of image data in the second image data has a corresponding aligning area of image data in the first image data, the selected areas of image data in the second image data having a length in the process direction that corresponds to a length of the ejected ink on the surface of the rotating member in the process direction.
7. The method of claim 6 further comprising:
identifying a second aligned area of image data in the first image data for each selected second area in the second image data with reference to the cross-correlation measurements obtained with respect to each selected second area in the second image data;
identifying a second area of image data within the area in the first image data that can be printed by the at least one printhead with reference to the identified second aligned area in the first image data;
interpolating an area of image data with reference to the identified first area of image data within the area in the first image data that can be printed by the at least one printhead and the identified second area of image data within the area in the first image data that can be printed by the at least one printhead, an interpolated area of image data being generated for each selected second area of image data in the second image data; and
reducing noise in the image data of the second image data that is within an area of the second image data that can be printed by the at least one printhead and that also corresponds to each selected second area of image data in the second image data, the noise in the second image data being reduced with reference to a ratio of the interpolated areas of image data generated for the selected second areas of image data in the second image data and the selected second areas of image data in the second image data.
8. The method of claim 7, the identification of the second area of image data within the area in the first image data that can be printed by the at least one printhead further comprising:
identifying the second area of image data as the identified first area of image data within the area in the first image data that can be printed by the at least one printhead shifted by one pixel in a process direction; and
the interpolation further comprising:
weighting values in the identified first area of image data and the identified second area of image data with reference to the minimum cross-correlation measurement and a next smallest cross-correlation measurement.
9. A printer comprising:
at least one printhead configured to eject ink;
a rotating member being positioned to rotate in front of the at least one printhead to enable the at least one printhead to eject ink onto a portion of a surface of the rotating member to form an ink image on the surface portion of the rotating member;
at least one optical sensor having an a linear array of detectors that extends across a width of the rotating member, the at least one optical sensor is configured to generate image data of the surface portion of the rotating member and a margin of the surface of the rotating member; and
a controller operatively connected to the at least one optical sensor, the controller being configured to:
receive from the at least one optical sensor first image data of the surface portion and margin of the rotating member without ink,
operate the at least one printhead to eject ink on the surface portion of the rotating member, the ejected ink corresponding to data stored in a memory of the printer,
receive from the at least one optical sensor second image data of the surface portion and margin of the rotating member bearing the ejected ink,
align the first image data that corresponds to the margin of the rotating member with the second image data that corresponds to the margin of the rotating member,
reduce noise in the second image data that corresponds to the surface portion of the rotating member with reference to image data in the first image data in the surface portion, the image data in the first image data used to reduce noise being aligned with the image data in the margin of the rotating member in the first image data that is aligned with the second image data that corresponds to the margin of the rotating member,
process the second image data having reduced noise to identify the ejected ink on the surface portion of the rotating member, and
operate the printer with reference to the ejected ink identified on the surface portion of the rotating member.
10. The printer of claim 9, the controller being further configured to:
identify an offset for each detector in the at least one optical sensor in the printer that is positioned to generate image data of the surface of the rotating member; and
remove the offset from the second image data before reducing the noise in the second image data.
11. The printer of claim 10, the at least one optical sensor further comprising:
a light source positioned to illuminate the surface of the rotating member; and
the controller being further configured to deactivate the light source to enable the at least one optical sensor to generate third image data of the surface of the rotating member that enables identification of the offset for each detector.
12. The printer of claim 9, the controller being further configured to:
operate the detectors of the optical sensor at a maximum sampling period.
13. The printer of claim 9, the controller being further configured to:
select a first area of image data in the image data that corresponds to the margin of the rotating member;
select a second area of image data in the image data that corresponds to the margin of the rotating member;
measure cross-correlation between the selected first area of image data and the selected second area of image data;
continuing to select another area of image data in the first image data that corresponds to the margin of the rotating member and measuring cross-correlation between the selected other area of image data corresponds to the margin of the rotating member and the second area of image data corresponds to the margin of the rotating member until a predetermined number of areas are selected;
identify one of the selected areas in the first image data as being aligned with the second area of image data in the second image data in response to the cross-correlation measurement between the aligned areas being a minimum for the cross-correlations measured for the predetermined number of areas; and
identifying a first area of image data in the first image data that corresponds to the surface portion of the rotating member with reference to the one selected area in the first image data identified as being aligned with the second area of image data in the second image data, the identified first area of image data that corresponds to the surface portion of the rotating member being used to reduce noise in image data in the second image data that corresponds to the surface portion of the rotating member in the second image data.
14. The printer of claim 13, the controller being further configured to:
continue to select another second area of image data in the second image data that corresponds to the margin of the rotating member and measure a plurality of cross-correlations between the selected other area of image data in the second image data and a predetermined number of selected areas of image data in the first image data corresponds to the margin of the rotating member until each selected area of image data in the second image data has a corresponding aligning area of image data in the first image data, the selected areas of image data in the second image data having a length in the process direction that corresponds to a length of the ejected ink on the surface of the rotating member in the process direction.
15. The printer of claim 14, the controller further configured to:
identify a second aligned area of image data in the first image data that corresponds to the margin of the rotating member for each selected second area in the second image data that corresponds to the margin of the rotating member with reference to the cross-correlation measurements obtained with respect to each selected second area in the second image data that corresponds to the margin of the rotating member;
identify a second area of image data in the first image data that corresponds to the surface portion of the rotating member with reference to the second aligned area in the first image data that corresponds to the margin of the rotating member;
interpolating an area of image data with reference to the identified first area of image data in the first image data that corresponds to the surface portion of the rotating member and the identified second area of image data in the first image data that corresponds to the surface portion of the rotating member, an interpolated area being generated for each selected second area of image data in the second image data that corresponds to the margin of the rotating member; and
reducing the noise in the image data of the second image data that corresponds to the surface portion of the rotating member and that also corresponds to each selected second area of image data in the second image data, the noise in the second image data being reduced with reference to a ratio of the interpolated areas of image data generated for the selected second areas of image data in the second image data and the selected second areas.
16. The printer of claim 15, the controller being further configured to:
identify the second area of image data as the identified first area of image data in the first image data that corresponds to the surface portion of the rotating member shifted by one pixel in a process direction, and
weight values in the identified first area of image data and the identified second area of image data with reference to the minimum cross-correlation measurement and a next smallest cross-correlation measurement.