CN101950039B - Rod-shaped lens array and image reading device therefrom - Google Patents
Rod-shaped lens array and image reading device therefrom Download PDFInfo
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- CN101950039B CN101950039B CN201010294523.3A CN201010294523A CN101950039B CN 101950039 B CN101950039 B CN 101950039B CN 201010294523 A CN201010294523 A CN 201010294523A CN 101950039 B CN101950039 B CN 101950039B
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0075—Arrays characterized by non-optical structures, e.g. having integrated holding or alignment means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/0281—Details of scanning heads ; Means for illuminating the original for picture information pick-up with means for collecting light from a line or an area of the original and for guiding it to only one or a relatively low number of picture element detectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/02885—Means for compensating spatially uneven illumination, e.g. an aperture arrangement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
- H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
- H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
- H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
- H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
- H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
- H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
- H04N2201/03108—Components of integral heads
- H04N2201/03112—Light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
- H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
- H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
- H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
- H04N2201/03108—Components of integral heads
- H04N2201/03116—Light source lens
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
- H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
- H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
- H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
- H04N2201/03108—Components of integral heads
- H04N2201/0312—Reflecting element upstream of the scanned picture elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
- H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
- H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
- H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
- H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
- H04N2201/03108—Components of integral heads
- H04N2201/03129—Transparent cover or transparent document support mounted on the head
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
- Lenses (AREA)
Abstract
The invention discloses a rod lens array with large depth of field and an image reading device therefrom. The rod lens array is characterized by comprising at least one first rod lens array and at least one second rod lens array, wherein the first rod lens array consists of a plurality of first rod lenses with a first conjugate length TC1, a first height Z1 and a first diameter phi 1 and the second rod lens array consists of a plurality of second rod lenses with a second conjugate length TC1, a second height Z1 and a second diameter phi 1, the at least one first rod lens array and the at least one second rod lens array are sandwiched between a first side plate and a second side plate which are used for supporting, and resin is used for bonding and fixing the first rod lens array and the second rod lens array to the first side plate and the second side plate. The rod lens array has large depth of field, can effectively solve image degradation because the original manuscript position deviates the normal focal position during high speed image reading process and can improve image reading quality.
Description
Technical field
The present invention relates to a kind of rod type lens array and image read-out, more particularly a kind ofly two kinds of lens arras of different nature are synthesized together the rod type lens array forming a kind of long depth of field, and the image read-out using this rod type lens array to form.
Background technology
Usually, as have in the image-reading devices such as scanner, composite integrated machine a kind of image read-out the pattern-information on original copy is transformed into telecommunications breath after be saved in the internal memory of equipment or deliver in computer and preserve.This image read-out mainly comprises light source, rod type lens array and photoelectric conversion sensor.Wherein rod type lens array plays focal imaging, determines the performance of image read-out to a great extent.
Fig. 1 is the partial structurtes schematic diagram of the rod type lens array used in conventional images reading device, in figure, 2 is existing rod type lens arrays, 21 is the side plates with supporting role, 22 for having another side plate of supporting role, 200 is monomer rod-shaped lens, 201 for monomer rod-shaped lens 200 be arranged in a straight line formed single array lens, single array lens 201 is clipped between side plate 21 and side plate 22, is adhesively fixed by adhesives 23.
The common labour length of lens is TC, is highly Z, and the height of focal position is H.The upper and lower both sides of rod type lens array are symmetrical, and the plane of focus corresponds respectively to object plane and picture plane.In use, original copy is positioned over object plane, and photoelectric conversion sensor is positioned over picture plane.
Fig. 2 is modulation transfer function (also referred to as the MTF) characteristic of above-mentioned rod type lens array.For whole rod type lens array, when original copy be in object plane namely in the plane of focal position time, the mtf value of lens is the highest, the picture quality namely transmitted is the most clear, when original copy off-focal position, the mtf value of lens will decline, and depart from far away, mtf value is lower, and the picture quality of transmission is poorer (the namely usually said depth of field is too little).For rod type lens array, during usual original copy off-focal position about 0.2mm, picture quality will obviously decline.Even the rod type lens array that angular aperture is less, also only have the acceptable scope of 0.5mm, and because the modulating transfer function value of the lens at focal position place is the highest, just reduce gradually after departing from, as long as so original copy deviate from focal position, will there is deterioration in the picture quality of reading.
Fig. 3 is the image read-out sectional drawing using above-mentioned rod type lens array 2 to form, , in figure, 1 is can send light and the line lighting source of uniform irradiation original copy, 2 is above-mentionedly converged by original copy reflected light and carry out the rod type lens array of imaging, 3 be arranged in a straight line for receiving light that rod type lens array 2 converges and light signal being converted to the photoelectric conversion sensor of electric signal, 4 is the sensor base plates carrying the photoelectric conversion sensor 3 be arranged in a straight line, 6 is hold above-mentioned light source 1, rod type lens array 2, the framework of sensor base plate 4, 5 is light-passing boards of the lift-launch original copy be arranged on framework 6, 10 is original copy.
In above-mentioned image read-out, original copy 10 is placed in the object plane interior (normally the surface of light-passing board) of rod type lens array 2, and photoelectric conversion sensor 3 is arranged in the picture plane of rod type lens array 2.Its imaging process is: the light that light source 1 sends, through light-passing board 5, be irradiated on the original copy 10 of outside, word black region light on original copy 10 is absorbed, and in other white-based color region of original copy, light almost 100% to be reflected, these reflected light are collected by rod type lens array 2 through glass plate 5 again, be irradiated on the photoelectric conversion sensor 3 on sensor base plate 4, photoelectric conversion sensor 3 is by many photosensitive pixels and the light be irradiated on each photosensitive pixel can be carried out opto-electronic conversion and be formed by the driving circuit that signal exports, export through overdrive circuit after the light received converts telecommunications to, outwards export as image (word) information.Original copy is movement constantly, and image information (word) described on it will be read continuously.
There is following problem in above-mentioned rod type lens array and image read-out: is in the focal position plane of rod type lens array 2 owing to only having original copy, namely the light-passing board of image read-out on the surface time, the picture signal that image read-out reads is only clearly, as long as original copy is off-focal position a little, the picture quality of reading will obviously decline.In the low-down image-reading device of reading speed in the past, as original copy is fixed on the flatbed scanner on light-passing board surface, composite integrated machine, or the facsimile recorder that original copy is close to light-passing board surface drive is feasible, but along with the development of technology, the reading speed of image read-out is more and more faster, original copy strictly cannot be confined in the plane of focal position, the cash inspecting machine used as financial industry or paper money counter, its sweep velocity is about 1000/minute, with such speed, original copy (bank note) by during image read-out almost at light-passing board near surface A car sped.In finance device at a high speed, generally for and allow original copy (bank note) can not produced card paper money phenomenon by image read-out smoothly, the height of the nearly 2mm of passage of original copy (bank note), also just say, when original copy (bank note) is by image read-out, be 2mm near the focal position of rod type lens array scope in pass through, in so wide scope (depth of field), existing rod type lens array and image read-out cannot read image clearly, therefore existing rod type lens array and image read-out cannot meet this new request for utilization.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the rod type lens array that a kind of long depth of field is provided and the image read-out formed thereof.
The present invention can be reached by following measure.
A kind of rod type lens array, comprises first side plate with supporting role, second side plate with supporting role, comprises at least two rod type lens arrays arranged, it is characterized in that between the first side plate and the second side plate.
Have a plurality of first rod-shaped lens that first uses as a servant length TC1, the first height Z1, the first diameter Ф 1 altogether, above-mentioned a plurality of first rod-shaped lens is at least arranged in an array and forms the first rod type lens array,
Have a plurality of second rod-shaped lens that second uses as a servant length TC2, the second height Z2, Second bobbin diameter Ф 2 altogether, above-mentioned a plurality of second rod-shaped lens is at least arranged in an array and forms the second rod type lens array,
First rod type lens array of above-mentioned at least one row and the second rod type lens array of above-mentioned at least one row are clipped in be had between the first above-mentioned side plate of supporting role and the second above-mentioned side plate with supporting role, the first lens arra and the second lens arra and adopt resin to be adhesively fixed between the first side plate and the second side plate.
Rod type lens array of the present invention, the common labour length TC1 of the first rod type lens array is wherein different from the common labour length TC2 of the second rod type lens array.
Rod type lens array of the present invention, wherein can be different in the height Z1 of the first rod type lens array and the height Z2 of the second rod type lens array, the diameter Ф 1 of the first rod type lens array and the diameter Ф 2 of the second rod type lens array also can be different.
Rod type lens array of the present invention, the first rod type lens array of plural number is wherein near the close arrangement of the first side plate, and the second rod type lens array of plural number is near the close arrangement of the second side plate.Also can be the first rod type lens array and the second plural rod type lens array cross arrangement.Or the close arrangement of the first rod type lens array of plural number, plural number the second rod type lens array in the both sides of the first lens arra respectively with the first side plate and the close arrangement of the second side plate.
A kind of image read-out, comprise can send light and in sweep limit the light source of uniform irradiation original copy, the reflected light reflected from original copy is converted to electric signal and the line scan image sensor outwards exported, above-mentioned reflected light focused on and images in the rod type lens array on above-mentioned line scan image sensor surface, it is characterized in that above-mentioned rod type lens array comprises.
Have a plurality of first rod-shaped lens that first uses as a servant length TC1, the first height Z1, the first diameter Ф 1 altogether, above-mentioned a plurality of first rod-shaped lens is at least arranged in an array and forms the first rod type lens array,
Have a plurality of second rod-shaped lens that second uses as a servant length TC2, the second height Z2, Second bobbin diameter Ф 2 altogether, above-mentioned a plurality of second rod-shaped lens is at least arranged in an array and forms the second rod type lens array,
There is the first side plate of supporting role and there is the second side plate of supporting role,
First rod type lens array of above-mentioned at least one row and the second rod type lens array of above-mentioned at least one row are clipped in be had between the first above-mentioned side plate of supporting role and the second above-mentioned side plate with supporting role, adopts resin to be adhesively fixed between the first side of the first lens arra and the second lens arra and the first side plate and the second side of the second side plate.
The present invention can be provided with focal position regulating device on rod type lens array surface, to regulate the height of rod-shaped lens.
Image read-out of the present invention, its focal position regulating device is located at rod type lens array surface to have light transmission control agent, specifically control agent is the transparent or semitransparent body with certain light transmission, control agent can be pasted onto rod type lens array surface, also can by printing or describing be coated in rod type lens array surface and be cured.
Image read-out of the present invention, its focal position regulating device covers whole region on the length direction of rod type lens array, and the Width of rod type lens array only covers the lens of wherein a kind of TC value.And when the columns of the same lens arra of its arranged adjacent (if diameter is first lens arra of Ф 1) is N1, the thickness of focal position regulating device is less than N1* Ф 1.
Image read-out of the present invention, its focal position regulating device be arranged at rod type lens array near line scan image sensor side and focal position do not reach on a kind of end face of lens arra on line scan image sensor surface.Or focal position regulating device is arranged at rod type lens array on the surface of a kind of lens arra of original copy side, the focal position of two kinds of lens arras is near the both sides of the scope floated in original copy position.Also can adopt in both ways simultaneously.
Effect of the present invention is, have employed the rod-shaped lens of two kinds of different TC values, increase the depth of field of rod type lens array in rod type lens array.Use the image read-out of this lens, the image of original copy clearly can be read in very dark field depth, employ focal position regulating device simultaneously, the original copy information that rod type lens array is read accurately can converge and image in line scan image sensor surface, overcome the reduction of the modulation transfer function that lens cause because the depth of field increases, improve the resolution of image, make image read-out obtain better development and application in long depth of field application.
Accompanying drawing explanation.
Fig. 1 is the partial structurtes schematic diagram of existing rod type lens array.
Fig. 2 is the depth of field of existing rod type lens array and the relation of modulation transfer function.
Fig. 3 is the section structure schematic diagram of conventional images reading device.
Fig. 4 is the partial structurtes schematic diagram of the rod type lens array of the embodiment of the present invention 1.
Fig. 5 is the section structure schematic diagram of the rod type lens array of the embodiment of the present invention 1.
Fig. 6 is the depth of field of the rod type lens array of the embodiment of the present invention 1 and the relation of modulation transfer function.
Fig. 7, Fig. 8 are the section structure schematic diagram of the rod type lens array of the embodiment of the present invention 2.
Fig. 9, Figure 10 are the section structure schematic diagram of the rod type lens array of the embodiment of the present invention 3.
Figure 11 is the end face structure schematic diagram of the rod type lens array of the embodiment of the present invention 4.
Figure 12 is the partial top view of the rod type lens array of the embodiment of the present invention 5.
Figure 13 is the sectional schematic diagram of the image read-out of the embodiment of the present invention 6.
Figure 14 is the partial structurtes schematic diagram of the rod type lens array used in the image read-out of the embodiment of the present invention 6.
Figure 15, Figure 16, Figure 17 are the modulation transfer function schematic diagram executing the image read-out of example 8 of the image read-out of the embodiment of the present invention 8.
Figure 18 is the sectional schematic diagram of the image read-out of the embodiment of the present invention 9.
Embodiment.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1: Fig. 4 is the partial structurtes schematic diagram of the rod type lens array of the embodiment of the present invention 1, in figure, 20 is rod type lens arrays, 21 and 22 is the side plates with supporting role, 200 is monomer rod-shaped lens, monomer rod-shaped lens 200 has two kinds of structures, have first and use as a servant length TC1 altogether, first height Z1, a plurality of first rod-shaped lens of the first diameter Ф 1 form the first rod type lens array 201 by line spread, have second and use as a servant length TC2 altogether, second height Z2, a plurality of second rod-shaped lens of Second bobbin diameter Ф 2 form the second rod type lens array 202 by line spread, above-mentioned first rod type lens array 201 and above-mentioned second rod type lens array 202 are clipped in be had between the first above-mentioned side plate 21 of supporting role and the second above-mentioned side plate 22 with supporting role, first lens arra 201 and the second lens arra 202 and adopt resin 23 to be adhesively fixed between the first side plate 21 and the second side plate 22.
The focal position of the first rod type lens array 201 is H1, and its plane corresponding to thing side is object plane 24, and the plane corresponding to image side is picture plane 25.The focal position of the second rod type lens array 202 is H2, and its plane corresponding to thing side is object plane 26, and the plane corresponding to image side is picture plane 27.
In the present embodiment, the first rod type lens array 201 adopts 1 row, and the second rod type lens array 202 also only have employed 1 row, and whole rod type lens array is made up of two row lens arras.Its section structure as shown in Figure 5.
In the present embodiment, the parameter of two kinds of lens is, diameter Ф 1 and the Ф 2 of two row lens are identical, are 0.35mm, and height Z1 and Z2 of two row lens is identical, for 4.3mm, the common labour length TC1 of two row lens is 9.1mm, TC2 is 10.1mm, and it is 2.4mm that the focal position corresponding to two kinds of lens is respectively H1, H2 is 2.9mm, i.e. the object plane of two kinds of lens or the picture plane difference height of 0.5mm.According to the difference of actual use occasion, can arrange different focal positions poor, but will cause the reduction of modulation transfer function during focal position difference too large, therefore the difference of focal position is advisable within 1mm usually.
Fig. 6 is the depth of field of the rod type lens array of the present embodiment and the graph of a relation of modulation transfer function, as can be seen from the figure, the rod type lens array that the lens arra of different TC value is formed is adopted in the present embodiment, although modulation transfer function decreases, but the depth of field of whole lens has had very large increase, within the scope of ± 1mm, the modulation transfer function of lens has remained unchanged substantially.
Embodiment 2, in the present embodiment, rod type lens array is made up of 3 row lens arras, as shown in Figure 7, Figure 8.Wherein single-row lens arra 201 is identical with embodiment 1 with the characteristic of 202.In the present embodiment, Fig. 7 is that employing 1 row 202 lens arra and 2 row 201 lens arras are formed, and 202 longer for TC value lens arras are placed in centre, and 201 lens that TC value is less are placed in the both sides of 202.For this rod type lens array be made up of three row lens, also the mode of figure Fig. 8 can be adopted, namely adopt 1 row 201 lens arra and 2 row 202 lens arras to form, and 201 less for TC value lens arras are placed in centre, 202 lens that TC value is longer are placed in the both sides of 201.
The difference of the columns of lens in use can make the light quantity through whole lens arra change, namely when lens columns is more, the light quantity of passing also can be more, and the light signal that namely lens can be collected can be stronger, uses under being suitable for the more weak occasion of light signal.The change of the modulation transfer function of lens only with the difference correlation of two kinds of lens TC values, its effect is identical with embodiment 1.
Embodiment 3, in the present embodiment, rod type lens array is made up of 5 row lens arras, as shown in Figure 9, Figure 10.Wherein single-row lens arra 201 is identical with embodiment 1 with the characteristic of 202.In the present embodiment, Fig. 9 is that employing 2 row 201 lens arra and 3 row 202 lens arras are formed, and 3 longer for TC value row 202 lens arras are placed in intermediate arrangement, and 2 row 201 lens that TC value is less are placed in the arranged on both sides of 202.For this rod type lens array be made up of 5 row lens, also can adopt the mode of Figure 10,3 row 201 lens arras less by TC value are placed in centre, and 2 row 202 lens arras that TC value is longer are placed in the both sides of 201.
Feature of the present invention is because the dislocation of focal position defines one section of substantially identical region of modulation transfer function after the lens arra composition rod type lens array of different TC value; the composition of other columns therefore do not comprised in above-described embodiment and the arrangement mode of other lens arra, also belong to the category of the present invention's protection.
Embodiment 4, in the above-described embodiments, height Z1 and Z2 and the diameter Ф 1 and Ф 2 of the lens arra 201 and 202 of two kinds of different characteristics are identical.In the present embodiment, height Z1 and the Z2 of the lens arra 201 and 202 of two kinds of different characteristics is different, as shown in figure 11.The difference also inevitable difference along with lens focus position of lens height, therefore has same effect with embodiment 1.Use two row lens to constitute rod type lens array in the present embodiment, adopt the building form of other columns and the present embodiment to have same effect.
Embodiment 5, in the present embodiment, diameter Ф 1 and the Ф 2 of the lens arra 201 and 202 of two kinds of different characteristics are different, the diameter Ф 1 of the first lens arra is 0.6mm, and be made up of 1 row, the diameter Ф 2 of the second lens arra is 0.35mm, be made up of 2 row, as shown in figure 12.The different angular aperture usually corresponding to it of diameter of rod-shaped lens is also different, and be therefore also the difference with TC value or focal position, it has same effect with embodiment 1.Use three row lens to constitute rod type lens array in the present embodiment, adopt the building form of other columns and the present embodiment to have same effect.
Embodiment 6, the present embodiment is the embodiment of the image read-out using aforementioned rodlike lens arra to form, and Figure 13 is the sectional drawing of the image read-out of the present embodiment.In figure, 1 is can send light and the line lighting source of uniform irradiation original copy, 20 is above-mentionedly converged by original copy reflected light and carry out the rod type lens array of imaging, 3 be arranged in a straight line for receiving light that rod type lens array 20 converges and light signal being converted to the photoelectric conversion sensor of electric signal, 4 is the sensor base plates carrying the photoelectric conversion sensor 3 be arranged in a straight line, 6 is the frameworks holding above-mentioned light source 1, rod type lens array 20, sensor base plate 4,5 is light-passing boards of the lift-launch original copy be arranged on framework 6, and 10 is original copy.
In above-mentioned image read-out, what rod type lens array 20 adopted is the rod type lens array of Figure 10, this rod type lens array is made up of 2 row 202 lens arras and 3 row 201 lens arras, and 3 shorter for TC value row 201 lens arras are placed in intermediate arrangement, and 2 row 202 lens that TC value is longer are placed in the arranged on both sides of 201.Its partial enlarged drawing as shown in figure 14.
In above-mentioned image read-out, original copy 10 is placed in the centre position of two object planes of rod type lens array 20, and photoelectric conversion sensor 3 is arranged in the picture plane far away of rod type lens array 20.Its imaging process is: the light that light source 1 sends, through light-passing board 5, be irradiated on the original copy 10 of outside, word black region light on original copy 10 is absorbed, and in other white-based color region of original copy, light almost 100% to be reflected, these reflected light are collected by rod type lens array 20 through glass plate 5 again, be irradiated on the photoelectric conversion sensor 3 on sensor base plate 4, photoelectric conversion sensor 3 is by many photosensitive pixels and the light be irradiated on each photosensitive pixel can be carried out opto-electronic conversion and be formed by the driving circuit that signal exports, export through overdrive circuit after the light received converts telecommunications to, outwards export as image (word) information.Original copy is movement constantly, and image information (word) described on it will be read continuously.
In above-mentioned image read-out, because rod type lens array 20 has two object planes, namely two highly different focuses, and original copy is arranged at the centre of two object planes (or focal position), therefore, in image reading process, even if the position of original copy has some to depart from, also between two object planes being still in rod type lens array, in this interval, the modulation transfer function constant substantially of lens, therefore read image is all same sharpness, and the quality of image because of the slight change of original copy position, deterioration can not occur.
Embodiment 7, the rod type lens array 20 used in above-described embodiment 6 is 5 array structures, and is made up of 3 row 201 and 2 row 201.Also can use any one frame mode given in previous embodiment 1 to embodiment 5, all there is same effect.
Embodiment 8, the present embodiment is the embodiment of the image read-out being provided with focal position regulating device on the basis of previous embodiment 6, and Figure 15 is the sectional drawing of the image read-out of the present embodiment.Wherein 8 is the focal position regulating devices used in the present embodiment, its function that all the other symbols are identical with embodiment 6 and embodiment 6 same or equivalent.
The rod type lens array used in the present embodiment remains and is made up of 5 row lens arras, and this 5 row lens arra is 201 lens arras arranging TC values shorter by 202 lens arras and 3 that 2 row TC values are longer to be formed, shorter 3 row 201 lens arras of TC value are placed in intermediate arrangement, and 2 row 202 lens that TC value is longer are placed in the arranged on both sides of 201.Photoelectric conversion sensor 3 is arranged in the picture plane corresponding to lens arra 202.
The focal position regulating device 8 used in the present embodiment is arranged at the side of the close photoelectric commutator 3 of rod type lens array, the length direction of rod type lens array covers whole region, the Width of rod type lens array is only covered on 3 shorter row 201 lens arras of the TC value that is positioned at rod type lens array center.
In the present embodiment, what focal position regulating device 8 adopted is propylene transparent panel, and its refractive index is 1.49, also can adopt other transparent material, as the material etc. of glass, polycarbonate, transparent ABS or some other high index of refraction.The focal position difference of the thickness of transparent panel and two of rod type lens array kinds of lens arras 201 and 202 and the refractive index of transparent panel determine.
We know, the direction that when light is propagated between the medium of two kinds of different refractivities, it is propagated can change, when the direction of propagation of light from optically thinner medium (medium that refractive index is smaller) directive optically denser medium (medium that refractive index the is larger) time reduces, when the direction of propagation of light from optically denser medium (medium that refractive index ratio is larger) directive optically thinner medium (medium that refractive index the is less) time increases relative to its angle of normal relative to its angle of normal.Figure 16 give from rod type lens array light out through transparent panel (be around air, the refractive index of air is 1.0) as focal position regulating device time, the situation of change of the direction of propagation of light.As can be seen from the figure, because light is less than incident angle (or emergence angle) θ 1 of light through the refraction angle θ 2 during optically denser medium, thus figure depending on the direction glazing direction of propagating offset downward.
Light from rod type lens array out after after overfocus apparatus for adjusting position, because the direction of propagation of light there occurs change, therefore the focal position of lens is also made to there occurs change, and light is less than incidence angle θ 1 through its refraction angle θ 2 during transparent panel as focal position regulating device, therefore make the focus of rod type lens array distally drift about, the drift value of focal position can be expressed from the next:
Δt=［（n-1）/n］*t。
Here t is the thickness of transparent panel, and n is the refractive index of transparent panel, and Δ t is the drift value of focal position.Such as in the present embodiment, the transparent panel of use for refractive index be the propylene transparent panel of 1.49, thickness is 1mm, then can make the focal position drift 0.33mm of lens.Also the light transmissive material that refractive index is larger can be used, or the material that thickness is thicker, the drift value of focal position can be made larger, its final requirement is the drift value of the focus of picture plane by increasing the shorter lens of focus, and lens arra 201 is overlapped with the focal position (as plane) of lens arra 202.
Photoelectric conversion sensor 3 is arranged in the picture plane at lens arra 202 place, then the picture plane of lens arra 201 then on photoelectric conversion sensor 3 surface about 0.5mm position on.Owing to adding focal position regulating device between photoelectric conversion sensor 3 and lens arra 201, the focal position of lens arra 201 is distally drifted about, and therefore the focal position (as plane) of lens arra 201 has also moved on on the surface of photoelectric conversion sensor 3 substantially.The focus as plane of two kinds of lens arras 201 and 202 of rod type lens array is raw coincides with photoelectric conversion sensor 3 surface, the sharpness of the picture signal that photoelectric conversion sensor 3 is received improves greatly, increases the modulation transfer function of the image read-out after the regulating device of focal position as shown in figure 17.
Embodiment 9, the present embodiment is on the basis of embodiment 8, and the surface of the object plane side of rod-shaped lens too increases the image read-out of focal position regulating device.Figure 18 is the sectional schematic diagram of the image read-out of the present embodiment.Remain the focal position regulating device 8 of the picture plane of lens in figure, on the surface of the object plane side of lens, too increase focal position regulating device 8 simultaneously.Two kinds of focal position regulating devices make with same material.The focal position regulating device that the surface of object plane side is arranged is arranged on the surface of the distant lens arra in focal position 202, the focal position of lens arra 202 is more distally drifted about, namely make the focal position difference of the object plane side of two kinds of lens increase, under consequently will keeping the condition of image reading mass conservation, original copy has wider domain of walker.The present embodiment is applicable to the wider occasion of channel range that original copy passes through.
Embodiment 10, in above-described embodiment 8 and embodiment 9, what rod type lens array adopted is 5 row lens arras, and is made up of 3 row 201 lens arras and 2 row 202 lens arras.Also the lens of other columns or other arrangement mode can be adopted also to have same effect.
Embodiment 11, in above-described embodiment 8 to embodiment 10, what focal position regulating device adopted is light-passing board, is affixed on lens surface, also the transparent or semitransparent body of the glue with certain light transmission can be used, by printing or describing be coated in rod type lens array surface and be cured.
Claims (3)
1. one kind has the image read-out of rod type lens array, comprise can send light and in sweep limit the light source of uniform irradiation original copy, the reflected light reflected from original copy is converted to electric signal and the line scan image sensor outwards exported, above-mentioned reflected light focused on and image in the rod type lens array on above-mentioned line scan image sensor surface, it is characterized in that above-mentioned rod type lens array comprises:
There are a plurality of first rod-shaped lens that first uses as a servant length TC1, the first height Z1, the first diameter Ф 1 altogether, above-mentioned a plurality of first rod-shaped lens is at least arranged in an array and forms the first rod type lens array, first bar-shaped lens surfaces is provided with focal position regulating device, focal position regulating device is located at rod type lens array surface to have light transmission control agent
There are a plurality of second rod-shaped lens that second uses as a servant length TC2, the second height Z2, Second bobbin diameter Ф 2 altogether, above-mentioned a plurality of second rod-shaped lens is at least arranged in an array and forms the second rod type lens array, second bar-shaped lens surfaces is provided with focal position regulating device, focal position regulating device is located at rod type lens array surface to have light transmission control agent
There is the first side plate of supporting role and there is the second side plate of supporting role,
First rod type lens array of above-mentioned at least one row and the second rod type lens array of above-mentioned at least one row are clipped in be had between the first above-mentioned side plate of supporting role and the second above-mentioned side plate with supporting role, adopts resin to be adhesively fixed between the first side of the first lens arra and the second lens arra and the first side plate and the second side of the second side plate.
2. a kind of image read-out with rod type lens array according to claim 1, it is characterized in that focal position regulating device be arranged at rod type lens array near line scan image sensor side and focal position do not reach on a kind of end face of lens arra on line scan image sensor surface.
3. according to a kind of image read-out with rod type lens array according to claim 1 or claim 2, it is characterized in that focal position regulating device is arranged at rod type lens array on the surface of a kind of lens arra of original copy side, the focal position of two kinds of lens arras is near the both sides of the scope floated in original copy position.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010294523.3A CN101950039B (en) | 2010-08-24 | 2010-09-28 | Rod-shaped lens array and image reading device therefrom |
| JP2013525111A JP5978211B2 (en) | 2010-08-24 | 2010-12-10 | Image reading apparatus constituted by a composite rod lens array |
| PCT/CN2010/079674 WO2012024873A1 (en) | 2010-08-24 | 2010-12-10 | Complex rod-shaped lens array and image reading device comprising the same |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010261272 | 2010-08-24 | ||
| CN201010261272.9 | 2010-08-24 | ||
| CN2010102612729 | 2010-08-24 | ||
| CN201010294523.3A CN101950039B (en) | 2010-08-24 | 2010-09-28 | Rod-shaped lens array and image reading device therefrom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101950039A CN101950039A (en) | 2011-01-19 |
| CN101950039B true CN101950039B (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010294523.3A Active CN101950039B (en) | 2010-08-24 | 2010-09-28 | Rod-shaped lens array and image reading device therefrom |
| CN201010294864.0A Active CN102014233B (en) | 2010-08-24 | 2010-09-28 | Contact image sensor |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010294864.0A Active CN102014233B (en) | 2010-08-24 | 2010-09-28 | Contact image sensor |
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| Country | Link |
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| JP (1) | JP5978211B2 (en) |
| CN (2) | CN101950039B (en) |
| WO (1) | WO2012024873A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6112977B2 (en) * | 2013-06-03 | 2017-04-12 | ニスカ株式会社 | Rod lens array and image sensor |
| JP6875431B2 (en) * | 2019-01-29 | 2021-05-26 | 日本板硝子株式会社 | Refraction distribution type lenses, optical products, optical instruments, glass compositions for refraction distribution type lenses, and methods for manufacturing refraction distribution type lenses. |
| CN114391246B (en) * | 2019-09-05 | 2024-08-02 | 三菱电机株式会社 | Image reading apparatus |
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| TW364065B (en) * | 1996-10-31 | 1999-07-11 | Mitsubishi Rayon Co | Low chromatic aberration rod type lens array and device, and an image scanner using such device |
| CN1308241A (en) * | 1999-12-20 | 2001-08-15 | 日本板硝子株式会社 | Imaging optical device |
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| JPS6378663A (en) * | 1986-09-20 | 1988-04-08 | Canon Inc | Image reader |
| JPH03295354A (en) * | 1990-04-13 | 1991-12-26 | Fuji Xerox Co Ltd | Picture reader |
| JPH0568132A (en) * | 1991-09-05 | 1993-03-19 | Fuji Xerox Co Ltd | Original reader |
| JPH09164717A (en) * | 1995-12-15 | 1997-06-24 | Stanley Electric Co Ltd | Head for optical printer |
| JPH10229473A (en) * | 1997-01-21 | 1998-08-25 | Xerox Corp | Input scanner for double depth of focus |
| JP3940487B2 (en) * | 1998-02-12 | 2007-07-04 | シチズン電子株式会社 | Contact image sensor |
| JP3938628B2 (en) * | 1998-03-13 | 2007-06-27 | シチズン電子株式会社 | Image reading device |
| JP4132599B2 (en) * | 2000-07-07 | 2008-08-13 | 日本板硝子株式会社 | Image forming apparatus |
| JP2004126284A (en) * | 2002-10-03 | 2004-04-22 | Canon Inc | Image read unit and image reader |
| JP3948439B2 (en) * | 2003-07-08 | 2007-07-25 | 三菱電機株式会社 | Contact image sensor and image reading apparatus using the same |
| JP2005295113A (en) * | 2004-03-31 | 2005-10-20 | Canon Inc | Image reading unit and image reading apparatus |
| US8228566B2 (en) * | 2008-03-31 | 2012-07-24 | Mitsubishi Electric Corporation | Image reading apparatus |
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- 2010-09-28 CN CN201010294523.3A patent/CN101950039B/en active Active
- 2010-09-28 CN CN201010294864.0A patent/CN102014233B/en active Active
- 2010-12-10 JP JP2013525111A patent/JP5978211B2/en active Active
- 2010-12-10 WO PCT/CN2010/079674 patent/WO2012024873A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW364065B (en) * | 1996-10-31 | 1999-07-11 | Mitsubishi Rayon Co | Low chromatic aberration rod type lens array and device, and an image scanner using such device |
| CN1308241A (en) * | 1999-12-20 | 2001-08-15 | 日本板硝子株式会社 | Imaging optical device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101950039A (en) | 2011-01-19 |
| CN102014233A (en) | 2011-04-13 |
| JP2013541722A (en) | 2013-11-14 |
| WO2012024873A1 (en) | 2012-03-01 |
| JP5978211B2 (en) | 2016-08-24 |
| CN102014233B (en) | 2015-04-08 |
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