US20100321785A1 - Abbe prism lens with improved focus and reduced flair - Google Patents
Abbe prism lens with improved focus and reduced flair Download PDFInfo
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- US20100321785A1 US20100321785A1 US12/852,022 US85202210A US2010321785A1 US 20100321785 A1 US20100321785 A1 US 20100321785A1 US 85202210 A US85202210 A US 85202210A US 2010321785 A1 US2010321785 A1 US 2010321785A1
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- Prior art keywords
- reflecting surface
- lens
- abbe prism
- abbe
- prism lens
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- 238000004088 simulation Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
- G02B17/045—Catoptric systems, e.g. image erecting and reversing system using prisms only having static image erecting or reversing properties only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
- G02B3/0068—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between arranged in a single integral body or plate, e.g. laminates or hybrid structures with other optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
Definitions
- the present invention relates to optics. More specifically, the present invention discloses an Abbe prism lens and a lens array assembly comprising a plurality of Abbe prism lenses for high-resolution imaging of a surface.
- the lens for a one to one imaging optical scanner is a rod lens array.
- FIG. 1 a perspective drawing of a prior-art rod lens array 100 .
- the rod lens array 100 is constructed from a plurality of fiber optic rod lenses 110 .
- Each individual fiber optic rod lens 110 is cut from a fiber optic glass strand, and its ends must be polished.
- the plurality of fiber optic rod lenses 110 are then arranged side by side, in a row or multiple rows with their optical axes in parallel, in a frame 120 and held in place by an adhesive layer 130 .
- the fiber optic rod lenses 110 are typically made from GRIN (graduated index) fibers, with the refractive index of the glass carefully controlled during manufacture to have a graduated refractive index that decreases radially from the central axis to the edge.
- GRIN graduated index
- GRIN type fiber optic glass strands are expensive in and of themselves; cutting and polishing the strands to precise lengths to form fiber optic rod lenses 110 , assembling them so that their axes are precisely parallel in the frame 120 , and gluing the fiber optic rod lenses 110 are all precision steps for which entire technologies have had to be developed in order to satisfy requirements.
- a major disadvantage of this type of lens is that because of the number of lenses and the difficulty in orienting them, it is not practical to shape the ends of the lenses so that they can magnify the surface that they are imaging; flat ends are used.
- it is necessary to use larger numbers of smaller-diameter rod lenses 110 In order to increase the imaging resolution, it is necessary to use larger numbers of smaller-diameter rod lenses 110 , limiting the maximum resolution and driving up the costs as the desired resolution increases.
- suppliers for the necessary GRIN fiber optic strands are limited, and thus the base materials themselves are expensive.
- the present invention provides an Abbe prism lens and a lens array assembly comprising a plurality of Abbe prism lenses.
- the present invention also provides a lens array where a plurality of lens faces are molded into surfaces of polymer bars, thus simplifying manufacturing, using inexpensive materials, and aligning the lenses without requiring significant manufacturing infrastructure.
- the present invention further provides a lens array where the lens faces are configurable at the time of design to support increased resolution.
- the Abbe prism lens of the present invention comprises an aspherical front lens disposed on a front surface of the Abbe prism, an aspherical rear lens disposed on a rear surface of the Abbe prism, a front bottom reflecting surface, a rear bottom reflecting surface, a left top reflecting surface, a right top reflecting surface, a front slope surface, and a rear slope surface comprising an upper rear slope surface and a lower rear slope surface.
- the front slope surface is positioned between the left top reflecting surface and the right top reflecting surface and the front surface.
- the rear slope surface is positioned between the left top reflecting surface and the right top reflecting surface and the rear surface.
- the front bottom reflecting surface is positioned between the front surface and the rear bottom reflecting surface and the rear bottom reflecting surface is positioned between the front bottom reflecting surface and the rear surface.
- the left top reflecting surface and the right top reflecting surface form a roof on the Abbe prism lens.
- Light is reflected off an object and enters the aspherical front lens of the Abbe prism lens. This light then reflects off the front bottom reflecting surface, reflects off the left top reflecting surface and the right top reflecting surface, reflects off the rear bottom reflecting surface, and exits the aspherical rear lens of the Abbe prism lens.
- a portion of the light takes a path that reflects firstly off the left top reflecting surface and then secondly off the right top reflecting surface before reflecting off the rear bottom reflecting surface.
- the other portion of the light takes a path that reflects firstly off the right top reflecting surface and then secondly off the left top reflecting surface before reflecting off the rear bottom reflecting surface.
- FIG. 1 is a perspective drawing of a prior art rod lens array
- FIG. 2A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 2B is a perspective front view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 2C is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 2D is a perspective rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 3A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 3B is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional side view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention
- FIG. 5A is an assembled view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention.
- FIG. 5B is an exploded view drawing illustrating an Abbe prism single lenslet assembly according to an embodiment of the present invention.
- FIG. 6A-6D are drawings illustrating light paths through an Abbe prism lens according to an embodiment of the present invention.
- FIG. 7A is a front view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- FIG. 7B is a rear view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- FIG. 7C is a top view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- FIG. 7D is a bottom view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- FIG. 7E is a perspective view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- FIG. 8A is an exploded view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention.
- FIG. 8B is an assembled view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention.
- FIG. 9A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention.
- FIG. 9B is a drawing illustrating a lens simulation for a convention lens array of the prior art.
- FIG. 10A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention.
- FIG. 10B is a drawing illustrating a lens simulation for a conventional lens array of the prior art.
- FIG. 2A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention
- FIG. 2B which is a perspective front view drawing illustrating an Abbe prism lens according to an embodiment of the present invention
- FIG. 2C which is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention
- FIG. 2D which is a perspective rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- the Abbe prism lens 200 of the present invention comprises an aspherical front lens 220 disposed on a front surface 210 of the Abbe prism 200 , an asherical rear lens 280 disposed on a rear surface 270 of the Abbe prism 200 , a front bottom reflecting surface 230 , a rear bottom reflecting surface 260 , a left top reflecting surface 250 , a right top reflecting surface 240 , a front slope surface 215 , and a rear slope surface 218 comprising an upper rear slope surface 217 and a lower rear slope surface 216 .
- the front slope surface 215 is positioned between the left top reflecting surface 250 and the right top reflecting surface 240 and the front surface 210 .
- the rear slope surface 218 is positioned between the left top reflecting surface 250 and the right top reflecting surface 240 and the rear surface 270 .
- the front bottom reflecting surface 230 is positioned between the front surface 210 and the rear bottom reflecting surface 260 and the rear bottom reflecting surface 260 is positioned between the front bottom reflecting surface 230 and the rear surface 270 .
- the left top reflecting surface 250 and the right top reflecting surface 240 form a roof on the Abbe prism lens 200 .
- FIG. 3A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention
- FIG. 3B which is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention.
- the angle range between the front bottom reflecting surface 230 and the rear bottom reflecting surface 260 is between 1 and 179 degrees.
- the angle range between the left top reflecting surface 250 and the right top reflecting surface 240 is between 1 and 90 degrees.
- FIG. 4 is a cross-sectional side view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention
- FIG. 5A which is an assembled view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention
- FIG. 5B is an exploded view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention.
- the present invention provides an Abbe prism lens assembly 700 which further comprises an aperture cover 300 positioned over the front surface 210 of the Abbe prism lens 200 and a field cover 400 positioned over the rear surface 270 of the Abbe prism lens 200 .
- the aperture cover 300 comprises an aperture hole 310 encircling the aspherical front lens 220 .
- the field cover 400 comprises a field hole 410 encircling the aspherical rear lens 280 .
- FIGS. 6A-6D are drawings illustrating light paths through an Abbe prism lens according to an embodiment of the present invention.
- an object such as a document is placed on a transparent surface 600 such as a glass platen of a flatbed scanner.
- a transparent surface 600 such as a glass platen of a flatbed scanner.
- Light is reflected off the object and enters the aspherical front lens 220 of the Abbe prism lens 200 .
- This light then reflects off the front bottom reflecting surface 230 , reflects off the left top reflecting surface 250 and the right top reflecting surface 240 , reflects off the rear bottom reflecting surface 260 , and exits the aspherical rear lens 280 of the Abbe prism lens.
- a portion of the light takes a path that reflects firstly off the left top reflecting surface 250 and then secondly off the right top reflecting surface 240 before reflecting off the rear bottom reflecting surface 260 .
- the other portion of the light takes a path that reflects firstly off the right top reflecting surface 240 and then secondly off the left top reflecting surface 250 before reflecting off the rear bottom reflecting surface 260 .
- FIG. 7A is a front view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention
- FIG. 7B which is a rear view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention
- FIG. 7C which is a top view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention
- FIG. 7D which is a bottom view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention
- FIG. 7E which is a perspective view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention.
- the present invention comprises a plurality of Abbe prism lenses connect together to form an Abbe prism lens array 200 A.
- the Abbe prism lens array 200 A is formed by, for example, injection molding of transparent material. Utilizing the Abbe prism lens array 200 A allows for reproducing or capturing a greater linear area of an image.
- FIG. 8A is an exploded view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention
- FIG. 8B which is an assembled view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention.
- the present invention provides an Abbe prism lens array assembly 700 A which further comprises an aperture cover 300 A positioned over the front surface 210 of the Abbe prism lens array 200 A and a field cover 400 A positioned over the rear surface 270 of the Abbe prism lens array 200 A.
- the aperture cover 300 A comprises a plurality of aperture cover holes 310 encircling the aspherical front lenses 220 .
- the field cover 400 A comprises a plurality of field holes 410 A encircling the aspherical rear lenses.
- FIG. 9A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention
- FIG. 9B is a drawing illustrating a lens simulation for a convention lens array of the prior art.
- FIGS. 9A and 9B show a spot size comparison between the Abbe prism lens array of the present invention and a conventional lens array when an image is positioned 1 mm away from the optimal focal point.
- the spot size is 36.11 ⁇ m and on the right hand side the spot size is 36.23 ⁇ m.
- the spot size is 121 ⁇ m and on the right hand side the spot size is 127 ⁇ m.
- the Abbe prism lens array of the present invention provides an improved image quality when an image is not positioned in the optimal position for best focus. For example, if a document is warped and portions of the document don't contact the platen glass, the Abbe prism lens array will still allow for a high quality image capture.
- the Abbe prism lens array of the present invention is more tolerant or forgiving when compared to the conventional lens array. With the conventional lens array any portions of a document or object that are positioned outside the optimal focal point are reproduced poorly. Devices utilizing the Abbe prism lens array of the present invention offer superior quality image reproduction or capture and have a higher focal point tolerance.
- FIG. 10A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention
- FIG. 10B is a drawing illustrating a lens simulation for a conventional lens array of the prior art.
- flair By altering the thickness of the front of the aperture cover, flair can be reduced. In other words, by increasing or decreasing the length of the aperture hole (increasing or decreasing the thickness between the front face of the aperture cover and the rear face of the aperture cover) flair can be reduced.
- flare By altering the diameter of the field cover hole, flare can be reduced and linear image range or size of captured image is controlled.
- the diameter of the aperture cover hole and the diameter of the field cover hole are different. In an embodiment of the present the diameter of the aperture cover hole and the diameter of the field cover hole are the same.
- curvature of the front lens and the curvature of the rear lens are different. In an embodiment of the present the curvature of the front lens and the curvature of the rear lens are the same.
- the aperture cover and the field cover have a plurality of holes organized such that the centers of the holes form a line down the center of the cover.
- the plurality of holes are spaced apart equally by the inter-axis distance.
- the plurality of holes are circular, oval, cylindrical, or conical.
- the aperture cover and the field cover are made of 1 piece, 2 pieces, 3 pieces, or more pieces.
- the one piece aperture cover is made of semi-flexible material and clamps over the Abbe prism lens or Abbe prism lens array. While the embodiments illustrated in the figures the aperture cover and the field cover are shown covering the front and rear of the Abbe prism lens, in other embodiments the aperture cover and the field cover cover the top and bottom or other orientations. In these embodiments the aperture cover and the field cover still provide aperture holes and field holes encircling the front and rear lenses.
- the aperture cover and the field cover further comprise mating elements to attach and hold the lens assembly together.
- mating elements to attach and hold the lens assembly together.
- a plurality of notches is positioned to mate with a plurality of ears on the aperture cover.
- An advantage of the present invention is that due to the wall thickness of the aperture cover and the field cover and the aperture and field holes extend to the edges of the individual lenses, cross-talk is prevented.
- the dots per inch (DPI) resolution of the lens array is adjustable at design time by changing the optical radii, conic constant, or aspherical coefficients of the lenses.
- the lens array can be designed to magnify the surface being imaged.
- the lens array of the present invention provides a substantial improvement over the prior art by reducing manufacturing complexity and materials costs. Furthermore, the lens array makes it substantially less difficult to increase the resolution of a device using the lens array compared to the prior art.
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Abstract
An Abbe prism lens and lens array are disclosed. The lens comprises front lenses disposed on a front surface of the Abbe prism, rear lenses disposed on a rear surface of the Abbe prism, a front bottom reflecting surface, a rear bottom reflecting surface, a left top reflecting surface, and a right top reflecting surface. An aperture cover is positioned over the front surface of the Abbe prism lens and a field cover is positioned over the rear surface of the Abbe prism lens. The aperture cover comprises aperture holes encircling the aspherical front lenses. The field cover comprises field holes encircling the aspherical rear lenses. Light enters the Abbe prism lens and reflects off the front bottom reflecting surface, reflects off the left top reflecting surface and the right top reflecting surface, reflects off the rear bottom reflecting surface, and exits the rear lens of the Abbe prism lens.
Description
- This application is a Continuation patent application of co-pending application Ser. No. 12/467,838, filed on 18 May 2009. The entire disclosure of the prior application, Ser. No. 12/467,838, from which an oath or declaration is supplied, is considered a part of the disclosure of the accompanying Continuation application and is hereby incorporated by reference.
- 1. Field of the Invention
- The present invention relates to optics. More specifically, the present invention discloses an Abbe prism lens and a lens array assembly comprising a plurality of Abbe prism lenses for high-resolution imaging of a surface.
- 2. Description of the Prior Art
- Traditionally, the lens for a one to one imaging optical scanner is a rod lens array. Please refer to
FIG. 1 , a perspective drawing of a prior-artrod lens array 100. Therod lens array 100 is constructed from a plurality of fiberoptic rod lenses 110. Each individual fiberoptic rod lens 110 is cut from a fiber optic glass strand, and its ends must be polished. The plurality of fiberoptic rod lenses 110 are then arranged side by side, in a row or multiple rows with their optical axes in parallel, in aframe 120 and held in place by anadhesive layer 130. The fiberoptic rod lenses 110 are typically made from GRIN (graduated index) fibers, with the refractive index of the glass carefully controlled during manufacture to have a graduated refractive index that decreases radially from the central axis to the edge. - However, this type of lens is expensive to manufacture. GRIN type fiber optic glass strands are expensive in and of themselves; cutting and polishing the strands to precise lengths to form fiber
optic rod lenses 110, assembling them so that their axes are precisely parallel in theframe 120, and gluing the fiberoptic rod lenses 110 are all precision steps for which entire technologies have had to be developed in order to satisfy requirements. - In addition, a major disadvantage of this type of lens is that because of the number of lenses and the difficulty in orienting them, it is not practical to shape the ends of the lenses so that they can magnify the surface that they are imaging; flat ends are used. In order to increase the imaging resolution, it is necessary to use larger numbers of smaller-
diameter rod lenses 110, limiting the maximum resolution and driving up the costs as the desired resolution increases. Furthermore, suppliers for the necessary GRIN fiber optic strands are limited, and thus the base materials themselves are expensive. - Therefore there is need for an improved lens array for which materials are substantially cheaper and which is simpler to manufacture, and which can have superior imaging properties without substantially increasing costs.
- To achieve these and other advantages and in order to overcome the disadvantages of the conventional method in accordance with the purpose of the invention as embodied and broadly described herein, the present invention provides an Abbe prism lens and a lens array assembly comprising a plurality of Abbe prism lenses.
- The present invention also provides a lens array where a plurality of lens faces are molded into surfaces of polymer bars, thus simplifying manufacturing, using inexpensive materials, and aligning the lenses without requiring significant manufacturing infrastructure.
- The present invention further provides a lens array where the lens faces are configurable at the time of design to support increased resolution.
- The Abbe prism lens of the present invention comprises an aspherical front lens disposed on a front surface of the Abbe prism, an aspherical rear lens disposed on a rear surface of the Abbe prism, a front bottom reflecting surface, a rear bottom reflecting surface, a left top reflecting surface, a right top reflecting surface, a front slope surface, and a rear slope surface comprising an upper rear slope surface and a lower rear slope surface.
- The front slope surface is positioned between the left top reflecting surface and the right top reflecting surface and the front surface. The rear slope surface is positioned between the left top reflecting surface and the right top reflecting surface and the rear surface. The front bottom reflecting surface is positioned between the front surface and the rear bottom reflecting surface and the rear bottom reflecting surface is positioned between the front bottom reflecting surface and the rear surface. The left top reflecting surface and the right top reflecting surface form a roof on the Abbe prism lens.
- Light is reflected off an object and enters the aspherical front lens of the Abbe prism lens. This light then reflects off the front bottom reflecting surface, reflects off the left top reflecting surface and the right top reflecting surface, reflects off the rear bottom reflecting surface, and exits the aspherical rear lens of the Abbe prism lens.
- After the light reflects off the front bottom reflecting surface a portion of the light takes a path that reflects firstly off the left top reflecting surface and then secondly off the right top reflecting surface before reflecting off the rear bottom reflecting surface. The other portion of the light takes a path that reflects firstly off the right top reflecting surface and then secondly off the left top reflecting surface before reflecting off the rear bottom reflecting surface.
- Light entering the Abbe prism lens of the present invention is reflected a total of four times before exiting. As a result, the corresponding image of the object is in up-right orientation and not upside-down.
- These and other objectives of the present invention will become obvious to those of ordinary skill in the art after reading the following detailed description of preferred embodiments.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:
-
FIG. 1 is a perspective drawing of a prior art rod lens array; -
FIG. 2A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 2B is a perspective front view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 2C is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 2D is a perspective rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 3A is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 3B is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention; -
FIG. 4 is a cross-sectional side view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention; -
FIG. 5A is an assembled view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention; -
FIG. 5B is an exploded view drawing illustrating an Abbe prism single lenslet assembly according to an embodiment of the present invention; -
FIG. 6A-6D are drawings illustrating light paths through an Abbe prism lens according to an embodiment of the present invention; -
FIG. 7A is a front view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention; -
FIG. 7B is a rear view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention; -
FIG. 7C is a top view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention; -
FIG. 7D is a bottom view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention; -
FIG. 7E is a perspective view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention; -
FIG. 8A is an exploded view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention; -
FIG. 8B is an assembled view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention; -
FIG. 9A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention; -
FIG. 9B is a drawing illustrating a lens simulation for a convention lens array of the prior art; -
FIG. 10A is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention; and -
FIG. 10B is a drawing illustrating a lens simulation for a conventional lens array of the prior art. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
- Refer to
FIG. 2A , which is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention, toFIG. 2B , which is a perspective front view drawing illustrating an Abbe prism lens according to an embodiment of the present invention, toFIG. 2C , which is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention, and toFIG. 2D , which is a perspective rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention. - As shown in
FIGS. 2A-2D , theAbbe prism lens 200 of the present invention comprises an asphericalfront lens 220 disposed on afront surface 210 of theAbbe prism 200, an ashericalrear lens 280 disposed on arear surface 270 of theAbbe prism 200, a frontbottom reflecting surface 230, a rearbottom reflecting surface 260, a lefttop reflecting surface 250, a righttop reflecting surface 240, afront slope surface 215, and arear slope surface 218 comprising an upperrear slope surface 217 and a lowerrear slope surface 216. - The
front slope surface 215 is positioned between the lefttop reflecting surface 250 and the righttop reflecting surface 240 and thefront surface 210. Therear slope surface 218 is positioned between the lefttop reflecting surface 250 and the righttop reflecting surface 240 and therear surface 270. The frontbottom reflecting surface 230 is positioned between thefront surface 210 and the rearbottom reflecting surface 260 and the rearbottom reflecting surface 260 is positioned between the frontbottom reflecting surface 230 and therear surface 270. - The left
top reflecting surface 250 and the righttop reflecting surface 240 form a roof on theAbbe prism lens 200. - Refer to
FIG. 3A , which is a side view drawing illustrating an Abbe prism lens according to an embodiment of the present invention and toFIG. 3B , which is a rear view drawing illustrating an Abbe prism lens according to an embodiment of the present invention. - As shown in
FIG. 3A , the angle range between the frontbottom reflecting surface 230 and the rearbottom reflecting surface 260 is between 1 and 179 degrees. - As shown in
FIG. 3B , the angle range between the lefttop reflecting surface 250 and the righttop reflecting surface 240 is between 1 and 90 degrees. - Refer to
FIG. 4 , which is a cross-sectional side view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention, toFIG. 5A , which is an assembled view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention, and toFIG. 5B , which is an exploded view drawing illustrating an Abbe prism lens assembly according to an embodiment of the present invention. - In the embodiment illustrated in
FIG. 4 , 5A, and 5B the present invention provides an Abbe prism lens assembly 700 which further comprises anaperture cover 300 positioned over thefront surface 210 of theAbbe prism lens 200 and afield cover 400 positioned over therear surface 270 of theAbbe prism lens 200. Theaperture cover 300 comprises anaperture hole 310 encircling the asphericalfront lens 220. Thefield cover 400 comprises afield hole 410 encircling the asphericalrear lens 280. - Refer to
FIGS. 6A-6D which are drawings illustrating light paths through an Abbe prism lens according to an embodiment of the present invention. - As shown in
FIGS. 6A-6D an object such as a document is placed on atransparent surface 600 such as a glass platen of a flatbed scanner. Light is reflected off the object and enters the asphericalfront lens 220 of theAbbe prism lens 200. This light then reflects off the frontbottom reflecting surface 230, reflects off the lefttop reflecting surface 250 and the righttop reflecting surface 240, reflects off the rearbottom reflecting surface 260, and exits the asphericalrear lens 280 of the Abbe prism lens. - After the light reflects off the front bottom reflecting surface 230 a portion of the light takes a path that reflects firstly off the left
top reflecting surface 250 and then secondly off the righttop reflecting surface 240 before reflecting off the rearbottom reflecting surface 260. The other portion of the light takes a path that reflects firstly off the righttop reflecting surface 240 and then secondly off the lefttop reflecting surface 250 before reflecting off the rearbottom reflecting surface 260. - Light entering the Abbe prism lens of the present invention is reflected a total of four times before exiting. As a result, the corresponding image of the object is in up-right orientation and not upside-down.
- Refer to
FIG. 7A , which is a front view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention, toFIG. 7B , which is a rear view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention, toFIG. 7C , which is a top view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention, toFIG. 7D , which is a bottom view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention, and toFIG. 7E which is a perspective view drawing illustrating an Abbe prism lens array according to an embodiment of the present invention. - In the embodiment illustrated in
FIGS. 7A-7E the present invention comprises a plurality of Abbe prism lenses connect together to form an Abbeprism lens array 200A. The Abbeprism lens array 200A is formed by, for example, injection molding of transparent material. Utilizing the Abbeprism lens array 200A allows for reproducing or capturing a greater linear area of an image. - Refer to
FIG. 8A , which is an exploded view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention and toFIG. 8B , which is an assembled view drawing illustrating an Abbe prism lens array assembly according to an embodiment of the present invention. - In the embodiment illustrated in
FIGS. 8A and 8B the present invention provides an Abbe prismlens array assembly 700A which further comprises anaperture cover 300A positioned over thefront surface 210 of the Abbeprism lens array 200A and afield cover 400A positioned over therear surface 270 of the Abbeprism lens array 200A. Theaperture cover 300A comprises a plurality of aperture cover holes 310 encircling the asphericalfront lenses 220. Thefield cover 400A comprises a plurality of field holes 410A encircling the aspherical rear lenses. - Refer to
FIG. 9A , which is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention and toFIG. 9B , which is a drawing illustrating a lens simulation for a convention lens array of the prior art. -
FIGS. 9A and 9B show a spot size comparison between the Abbe prism lens array of the present invention and a conventional lens array when an image is positioned 1 mm away from the optimal focal point. On the left hand side ofFIG. 9A the spot size is 36.11 μm and on the right hand side the spot size is 36.23 μm. On the left hand side ofFIG. 9B the spot size is 121 μm and on the right hand side the spot size is 127 μm. - By comparing the two results it is easily seen that the Abbe prism lens array of the present invention provides an improved image quality when an image is not positioned in the optimal position for best focus. For example, if a document is warped and portions of the document don't contact the platen glass, the Abbe prism lens array will still allow for a high quality image capture. The Abbe prism lens array of the present invention is more tolerant or forgiving when compared to the conventional lens array. With the conventional lens array any portions of a document or object that are positioned outside the optimal focal point are reproduced poorly. Devices utilizing the Abbe prism lens array of the present invention offer superior quality image reproduction or capture and have a higher focal point tolerance.
- Refer to
FIG. 10A , which is a drawing illustrating a lens simulation for the Abbe prism lens array according to an embodiment of the present invention and toFIG. 10B , which is a drawing illustrating a lens simulation for a conventional lens array of the prior art. - Again with a defocus of 1 mm the image comparison between the Abbe prism lens array of the present invention and the conventional lens array clearly shows that the resultant image is far more focused and superior for the Abbe prism lens array.
- Since the Abbe prism lens and Abbe prism lens array are formed in one piece injection-molding, issues associated with assembly stack-up tolerances are minimized.
- By altering the thickness of the front of the aperture cover, flair can be reduced. In other words, by increasing or decreasing the length of the aperture hole (increasing or decreasing the thickness between the front face of the aperture cover and the rear face of the aperture cover) flair can be reduced.
- Additionally, by altering the diameter of the aperture hole image intensity can be controlled.
- By altering the diameter of the field cover hole, flare can be reduced and linear image range or size of captured image is controlled.
- In an embodiment of the present the diameter of the aperture cover hole and the diameter of the field cover hole are different. In an embodiment of the present the diameter of the aperture cover hole and the diameter of the field cover hole are the same.
- In an embodiment of the present the curvature of the front lens and the curvature of the rear lens are different. In an embodiment of the present the curvature of the front lens and the curvature of the rear lens are the same.
- In some embodiments of the present invention the aperture cover and the field cover have a plurality of holes organized such that the centers of the holes form a line down the center of the cover. The plurality of holes are spaced apart equally by the inter-axis distance. The plurality of holes are circular, oval, cylindrical, or conical.
- In some embodiments of the present invention the aperture cover and the field cover are made of 1 piece, 2 pieces, 3 pieces, or more pieces. For example, in an embodiment the one piece aperture cover is made of semi-flexible material and clamps over the Abbe prism lens or Abbe prism lens array. While the embodiments illustrated in the figures the aperture cover and the field cover are shown covering the front and rear of the Abbe prism lens, in other embodiments the aperture cover and the field cover cover the top and bottom or other orientations. In these embodiments the aperture cover and the field cover still provide aperture holes and field holes encircling the front and rear lenses.
- In embodiments of the present invention the aperture cover and the field cover further comprise mating elements to attach and hold the lens assembly together. For example, along the edges of the field cover a plurality of notches is positioned to mate with a plurality of ears on the aperture cover.
- When the lens array assembly is used in an image scanner, it is very important that image light does not pass from one lens into another lens that is not perpendicular to it. When this light progresses into an adjacent lens, the resultant image that the sensor captures is a ghost image of the adjacent lens. This is called cross-talk and is undesirable.
- An advantage of the present invention is that due to the wall thickness of the aperture cover and the field cover and the aperture and field holes extend to the edges of the individual lenses, cross-talk is prevented.
- The dots per inch (DPI) resolution of the lens array is adjustable at design time by changing the optical radii, conic constant, or aspherical coefficients of the lenses. In contrast with the prior art rod lenses, the lens array can be designed to magnify the surface being imaged.
- The lens array of the present invention provides a substantial improvement over the prior art by reducing manufacturing complexity and materials costs. Furthermore, the lens array makes it substantially less difficult to increase the resolution of a device using the lens array compared to the prior art.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the invention and its equivalent.
Claims (12)
1. A lens comprising:
an Abbe prism, the Abbe prism comprising an aspherical front lens disposed on a front surface of the Abbe prism and an asherical rear lens disposed on a rear surface of the Abbe prism.
2. The lens of claim 1 , further comprising:
an aperture cover on the front surface of the Abbe prism, the aperture cover comprising an aperture hole encircling the aspherical front lens.
3. The lens of claim 1 , further comprising:
an aperture cover over the front surface of the Abbe prism, the aperture cover comprising an aperture hole for allowing light to enter the aspherical front lens.
4. The lens of claim 1 , the Abbe prism further comprising:
a front bottom reflecting surface;
a rear bottom reflecting surface;
a left top reflecting surface; and
a right top reflecting surface;
where light enters the aspherical front lens of the Abbe prism, reflects off the front bottom reflecting surface, reflects off the left top reflecting surface and the right top reflecting surface, reflects off the rear bottom reflecting surface, and exits the aspherical rear lens of the Abbe prism.
5. The lens of claim 4 , where the angle between the front bottom reflecting surface and the rear bottom reflecting surface is between 1 and 179 degrees.
6. The lens of claim 4 , where the angle between the left top reflecting surface and the right top reflecting surface is between 1 and 90 degrees.
7. A lens array comprising:
a plurality of Abbe prisms, each Abbe prism comprising an aspherical front lens disposed on a front surface of the Abbe prism and an asherical rear lens disposed on a rear surface of the Abbe prism.
8. The lens array of claim 7 , each Abbe prism further comprising:
a front bottom reflecting surface;
a rear bottom reflecting surface;
a left top reflecting surface; and
a right top reflecting surface;
where light enters the aspherical front lens of the Abbe prism, reflects off the front bottom reflecting surface, reflects off the left top reflecting surface and the right top reflecting surface, reflects off the rear bottom reflecting surface, and exits the aspherical rear lens of the Abbe prism.
9. The lens array of claim 8 , where the angle between the front bottom reflecting surface and the rear bottom reflecting surface is between 1 and 179 degrees.
10. The lens array of claim 8 , where the angle between the left top reflecting surface and the right top reflecting surface is between 1 and 90 degrees.
11. The lens array of claim 7 , further comprising:
an aperture cover positioned on the front surface of the plurality of Abbe prisms, the aperture cover comprising a plurality of aperture holes encircling the aspherical front lenses
12. The lens array of claim 7 , where the plurality of Abbe prisms are formed as one piece of transparent polymer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/852,022 US20100321785A1 (en) | 2009-05-18 | 2010-08-06 | Abbe prism lens with improved focus and reduced flair |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/467,838 US7869137B2 (en) | 2009-05-18 | 2009-05-18 | ABBE prism lens with improved focus and reduced flair |
US12/852,022 US20100321785A1 (en) | 2009-05-18 | 2010-08-06 | Abbe prism lens with improved focus and reduced flair |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/467,838 Continuation US7869137B2 (en) | 2009-05-18 | 2009-05-18 | ABBE prism lens with improved focus and reduced flair |
Publications (1)
Publication Number | Publication Date |
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US20100321785A1 true US20100321785A1 (en) | 2010-12-23 |
Family
ID=43068303
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US12/467,838 Expired - Fee Related US7869137B2 (en) | 2009-05-18 | 2009-05-18 | ABBE prism lens with improved focus and reduced flair |
US12/852,022 Abandoned US20100321785A1 (en) | 2009-05-18 | 2010-08-06 | Abbe prism lens with improved focus and reduced flair |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US12/467,838 Expired - Fee Related US7869137B2 (en) | 2009-05-18 | 2009-05-18 | ABBE prism lens with improved focus and reduced flair |
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US (2) | US7869137B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150241709A1 (en) * | 2014-02-25 | 2015-08-27 | Sypro Optics Gmbh | Lens with at least one object-side and at least one image-side refractive surface |
JP2016138947A (en) * | 2015-01-27 | 2016-08-04 | 東芝テック株式会社 | Lens mirror array, optical unit, and image forming apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7869137B2 (en) * | 2009-05-18 | 2011-01-11 | Pixon Technologies Corp. | ABBE prism lens with improved focus and reduced flair |
Citations (5)
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US4173394A (en) * | 1976-09-20 | 1979-11-06 | Marcel Clave | Prism combination periscope |
US6215596B1 (en) * | 1998-09-14 | 2001-04-10 | Canon Kabushiki Kaisha | Optical element, optical device provided therewith, and method for evaluating optical element |
US20090027780A1 (en) * | 2007-07-23 | 2009-01-29 | Stereo Display, Inc. | Compact image taking lens system with a lens-surfaced prism |
US20100266294A1 (en) * | 2006-12-22 | 2010-10-21 | Schleifring Und Apparatebau Gmbh | Multi-Channel Optical Rotary Transmission Device with High Return Loss |
US7869137B2 (en) * | 2009-05-18 | 2011-01-11 | Pixon Technologies Corp. | ABBE prism lens with improved focus and reduced flair |
-
2009
- 2009-05-18 US US12/467,838 patent/US7869137B2/en not_active Expired - Fee Related
-
2010
- 2010-08-06 US US12/852,022 patent/US20100321785A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4173394A (en) * | 1976-09-20 | 1979-11-06 | Marcel Clave | Prism combination periscope |
US6215596B1 (en) * | 1998-09-14 | 2001-04-10 | Canon Kabushiki Kaisha | Optical element, optical device provided therewith, and method for evaluating optical element |
US20100266294A1 (en) * | 2006-12-22 | 2010-10-21 | Schleifring Und Apparatebau Gmbh | Multi-Channel Optical Rotary Transmission Device with High Return Loss |
US20090027780A1 (en) * | 2007-07-23 | 2009-01-29 | Stereo Display, Inc. | Compact image taking lens system with a lens-surfaced prism |
US7869137B2 (en) * | 2009-05-18 | 2011-01-11 | Pixon Technologies Corp. | ABBE prism lens with improved focus and reduced flair |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150241709A1 (en) * | 2014-02-25 | 2015-08-27 | Sypro Optics Gmbh | Lens with at least one object-side and at least one image-side refractive surface |
US9678320B2 (en) * | 2014-02-25 | 2017-06-13 | Jabil Optics Germany GmbH | Lens with at least one object-side and at least one image-side refractive surface |
US10185135B2 (en) | 2014-02-25 | 2019-01-22 | Jabil Optics Germany GmbH | Lens with at least one object-side and at least one image-side refractive surface |
JP2016138947A (en) * | 2015-01-27 | 2016-08-04 | 東芝テック株式会社 | Lens mirror array, optical unit, and image forming apparatus |
Also Published As
Publication number | Publication date |
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US7869137B2 (en) | 2011-01-11 |
US20100290134A1 (en) | 2010-11-18 |
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