CN101047765A - Image reader - Google Patents
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- CN101047765A CN101047765A CN 200610065992 CN200610065992A CN101047765A CN 101047765 A CN101047765 A CN 101047765A CN 200610065992 CN200610065992 CN 200610065992 CN 200610065992 A CN200610065992 A CN 200610065992A CN 101047765 A CN101047765 A CN 101047765A
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Abstract
This invention relates to an image reader including: an illuminating unit using ligh to illuminate objects to be read, a first optical system letting the first reflection light from the being read object pass through, a second optical system allowing the second reflection light from the being read object to pass through, an imaging unit switching between the two optical systems by a switch unit to form images of the first reflection light traveling in the first optical system and images of the second reflection light traveling in the second optical system and a light receiving unit receiving the first and second reflection lights forming multiple images to generate related image signals.
Description
Technical field
The present invention relates to a kind of information of relevant texture of catching original paper and in cis, reproduce the technology of this information.
Background technology
Object surfaces has " texture " separately.For example, the surface of polishing metal gives the observer with " reflecting feel ", and the surface of cloth or fabric gives the observer with " rough sense ".In order to represent object more realistically, must catch the information about texture (texture information) (as gloss and sensation (outward appearance and sense of touch)) of actual object and reproduce this texture information as actual object.Therefore, in the cis of scanner, photocopier etc., attempted the texture information that not only reads the colouring information of object but also read object.
The texture of object depends primarily on the reflection case of light on body surface.Usually, the reverberation on the body surface is made up of the specular light and the diffusing of low directivity of high directivity, and wherein, the texture of object is according to the ratio of these two kinds of light and difference.For example, the catoptrical ratio of minute surface is higher relatively on the surface of polishing metal, and therefore, the metal surface has glossiness.On the other hand, on the matt object surfaces such as cloth or fabric, the ratio that diffuses is higher relatively.That is, obtain specular light and the ratio that diffuses by the reverberation of measuring from body surface, thereby verily express the texture of this object, more particularly, the glossiness of object.
In cis, utilizing diffuses reads the object that constitutes original paper.That is, in cis, receive the reverberation that diffuses in a large number contain from original paper, and diffuse based on this and to generate the colouring information of object.On the other hand, when cis being designed so that to receive the reverberation that contains from a large amount of specular lights of original paper, may have following situation: the surface condition direct reflection light component according to original paper becomes excessive, and has reduced based on the color reading performance to the original paper image that diffuses.Therefore, make imaging optical system be designed so that to reach minimum, make to receive and contain the reverberation that diffuses as much as possible from the specular light of original paper.
On the other hand, in order to read the texture on original paper surface, cis can be configured such that to receive, and obtain colouring information and texture information based on corresponding reflected light component from the diffusing and specular light of original paper.For example, known following technology: wherein, by from light source to the light of object to be duplicated (original paper) emission read mainly contain the image (diffuse reflection image) that diffuses, by from another light source to waiting that the light that duplicates the object emission reads image (direct reflection image) that mainly contains specular light and the glossiness signal that generates the expression gloss based on these picture signals.That is, in this technology, obtain to wait to duplicate the colouring information of object based on diffusing, and the texture information that acquisition waits to duplicate object based on specular light.
Yet there is following shortcoming in the texture information of using this technology to obtain the original paper surface.
In above-mentioned technology, described optical system contains two different lighting units, and a lighting unit (light source) is used for obtaining to diffuse, and another lighting unit (light source) is used to obtain specular light.Therefore, the structure that is used to the to shine original paper size that becomes is very big and increased cost.In addition, these lighting units are positioned at the different positions of reading, therefore, when obtaining the overlapping image by these reverberation, promptly, when diffuse reflection image and direct reflection image are overlapped, must use with the displacement of diffuse reflection image and direct reflection image after the position of these picture signals of correction such as the corresponding memory in position.
In addition, in said structure, because it is different with the catoptrical optical path length that reads specular light to read the catoptrical optical path length that diffuses, therefore, unless take any measure, otherwise will under the situation that correctly at least one reverberation is not focused into image, receive this reverberation.Therefore, in order to make these reverberation can carry out correct imaging, must regulate catoptrical focus point at every turn, and carry out the read operation of twice pair of original paper.
Summary of the invention
In view of above situation has proposed the present invention, the invention provides a kind of making can the easier technology that obtains texture information more quickly.
According to one aspect of the invention, cis comprises: lighting unit, and it uses rayed object to be read; First optical system, it makes and can advance therein from first reverberation of object to be read; Second optical system, it makes and advances therein from second reverberation of object to be read; Switch unit, it switches between first optical system that will use and second optical system; Image-generating unit, it switches between first optical system and second optical system by switch unit, is formed on first catoptrical image of advancing in first optical system and the second catoptrical image of advancing in second optical system; And light receiving unit, it receives first reverberation and second reverberation that forms a plurality of images by described image-generating unit, and generates image signals corresponding.
Description of drawings
To be described in detail a plurality of embodiment of the present invention based on the following drawings, in the accompanying drawings:
Fig. 1 is the figure that the device architecture of the cis of first exemplary embodiment according to the present invention is shown.
Fig. 2 is the figure of the structure of full rate assembly (full rate carriage) that same embodiment is shown.
Fig. 3 is the figure that illustrates from the example of the intensity distributions of the specular light of original paper P.
Fig. 4 is the figure of structure that the full rate assembly of the present invention's second exemplary embodiment is shown.
Fig. 5 is the figure of structure that the full rate assembly of the present invention's the 3rd exemplary embodiment is shown.
Fig. 6 is the figure of structure that the full rate assembly of the present invention's the 4th exemplary embodiment is shown.
Fig. 7 illustrates the figure that the structure of liquid crystal light valve (liquidcrystal shutter) wherein is installed on full rate assembly shown in Figure 6.
Fig. 8 is the figure of structure that the full rate assembly of the present invention's the 5th exemplary embodiment is shown.
Fig. 9 is that schematically illustrated full rate assembly by the 3rd exemplary embodiment focuses on and forms first reverberation of image and the figure of the second catoptrical direction.
Figure 10 is the figure of structure that the full rate assembly of the present invention's the 6th exemplary embodiment is shown.
Figure 11 is the figure of structure that the full rate assembly of the present invention's the 7th exemplary embodiment is shown.
Figure 12 is the figure that the full rate assembly of the exemplary embodiment that comprises prism is shown.
Embodiment
Below, the present invention is described in detail based on a plurality of embodiment with reference to accompanying drawing.
Cis of the present invention comprises optical system (a plurality of mirror), wherein, to finally direct on the same light path from first reverberation and second reverberation of original paper (using this original paper of rayed), and receive this first reverberation and second reverberation by same light receiving unit (linear imaging sensor) from single lighting unit (light source).Because this structure, therefore comparing cis of the present invention with the normal image reader can more easily obtain texture information.In addition,, above-mentioned first reverberation and second reverberation are captured as synthetic reverberation and read this synthetic reverberation by single read operation, therefore, can obtain texture information quickly than normal image reader according to the present invention.Below, the present invention is described in detail in conjunction with several embodiment.
First embodiment
Fig. 1 is the figure of device architecture that the cis 100 of first exemplary embodiment according to the present invention is shown.As shown in the figure, cis 100 comprises concora crush glass 11, concora crush lid 12, full rate assembly 13, half rate assembly (half rate carriage) 14, imaging len 15, linear imaging sensor 16 and operation part 17.
Concora crush glass 11 is formed by the transparency glass plate that is placed with original paper P to be read on it.On two surfaces of concora crush glass 11, for example be formed with the anti-reflecting layer that forms by dielectric multilayer coating etc., reduce lip-deep light reflection thus at concora crush glass 11.Concora crush lid 12 is arranged to concora crush lid 12 to be covered concora crush glass 11 and stops exterior light so that read the original paper P that places on the concora crush glass 11.
Original paper P is not limited to paper, but can be formed by plastic sheet (as the OHP sheet), sheet metal, cloth or fabric.
Fig. 2 shows the structure of the full rate assembly 13 of present embodiment.Full rate assembly 13 comprises light source 131, mirror 132,133,134 and rotatable reflector 135.Light source 131 for example is made of tungsten halogen lamp or xenon fluorescent lamp and utilizes rayed original paper P.Mirror 132,133,134 also reflects from the reverberation of original paper P and with reverberation and directs into half rate assembly 14.Rotatable reflector 135 is formed on the one surface catoptrical mirror 135m and light absorbing light trap (light trap) 135t on its another surface.Light trap 135t is for example formed by black porous polyurethane sheet, and the surface trapping of light trap 135t also absorbs the most of light that is incident on the light trap 135t.
When rotatable reflector 135 was positioned at position shown in Figure 2, rotatable reflector 135 reflections were also guided to half rate assembly 14 with this photoconduction from the light of mirror 132, and, on the other hand, absorb light from mirror 134.The axle 135a that rotatable reflector 135 is made to axle by not shown drive part rotates, and rotatable reflector 135 can be moved to the position of being represented by dotted line (135 ') in the figure.When rotatable reflector 135 was positioned at this position, rotatable reflector 135 was directed to half rate assembly 14 with light from mirror 134, on the other hand, absorbed the light of scan mirror 132.
Wherein, the light path that light has and the light path of the light of reflection aligns on mirror 134 that reflects by rotatable reflector 135.By adopting this structure, can use same light receiving unit (linear imaging sensor 16) to receive two kinds of different types of reverberation.
Here, the reverberation of advancing in the inside of full rate assembly 13 is described.
As mentioned above, specular light has high directivity and most of specular light by the substantially the same angle reflection with respect to incidence angle.Fig. 3 shows the example from the intensity distributions of the specular light of original paper P, wherein, will be illustrated in the deviation angle of incidence angle (intensity that is illustrated on the longitudinal axis is characteristic) on the transverse axis.In contrast, the directivity that diffuses is very low and reflect on all angles equably basically.
Then, in the full rate assembly 13 of present embodiment, will be from the light L of light source 131
InIncidence angle be set to about 45 °, with respect to light L
InLight L by about 45 ° angle of reflection reflection
SrReflection on mirror 133 is with light L
SrWith acting on the reverberation (second reverberation) that reads specular light.Although light L
SrNot only contain specular light but also contain and diffuse, but learn calculating and offset light L by the picture signal that generates is imposed on fixed number receiving this light after
SrCorresponding to the component that diffuses.On the other hand, by with the identical mode of general image reader that only reads colouring information, based on respect to light L
InLight L by about 0 ° angle of reflection reflection
DrRead and diffuse, and with light L
DrBe set to be used to read the reverberation (first reverberation) that diffuses.That is, be used to read the reverberation L of specular light
SrOn mirror 133,134 and half rate assembly 14, reflect, and on linear imaging sensor 16, be focused to image by imaging len 15.In addition, be used to read the reverberation L that diffuses
DrOn mirror 132, rotatable reflector 135 and half rate assembly 14, reflect, and on linear imaging sensor 16, be focused to image by imaging len 15.
Here, in the following description, will be used to read the reverberation L that diffuses
DrBe called " first reverberation ", and will be used to read the reverberation L of specular light
SrBe called " second reverberation ".
In addition, in the present embodiment, can described a plurality of mirrors of following layout and rotatable reflector.That is, make reverberation L
DrFrom original paper P direct into the optical path length (P-132-135-141) of half rate assembly 14 with reverberation L
SrThe optical path length (P-133-134-141) that directs into half rate assembly 14 from original paper P equates.In the case, even the change in location of rotatable reflector 135, the focus point of this imaging optical system is also constant.Because this structure owing to focal position does not change with respect to each reverberation, therefore needn't be regulated focal position when reading reverberation.
Along the inscape of arranging above-mentioned full rate assembly 13, so that it has and the width of concora crush glass 11 equal widths basically as a whole perpendicular to the direction of the paper of Fig. 2.In addition, by not shown drive part full rate assembly 13 is moved by the direction that speed v represents along the arrow C of Fig. 1.The direction that actuating by drive part makes full rate assembly 13 represent along arrow C moves, and full rate assembly 13 can scan the whole surface of original paper P.
Referring again to Fig. 1, below a plurality of parts of cis 100 are described.
Imaging len 15 is disposed on the light path that connects mirror 142 and linear imaging sensor 16 and forms image from the light of original paper P on the surface of linear imaging sensor 16.Linear imaging sensor 16 is light receiving element (as 3 line colored CCD (charge coupled device) imageing sensors etc.), it for example receives the light of three kinds of colors being made up of R (red), G (green) and B (indigo plant) and these light is carried out opto-electronic conversion, the corresponding picture signal of light quantity that generates thus and export and receive by the mode of separating.
Operation by not shown control section control each part mentioned above.This control section comprises mathematical operation device (as CPU (central processing unit)) and various memory (as ROM (read-only memory), RAM (random access memory)) etc.This control section provides instruction in response to the instruction of user's input to above-mentioned drive part, indicates drive part to carry out given operation with reading images thus.In addition, control section applies various image processing (as AD conversion, γ conversion, shading correction (shading correction)) to the picture signal from linear imaging sensor 16 outputs, forms view data thus.From the picture signal of linear imaging sensor 16 output by forming based on the second catoptrical picture signal with based on the first catoptrical picture signal.Control section utilizes these picture signals to carry out given mathematical operation and generates the view data that contains relevant for the information of texture.Carry out the Mathematical treatment of offsetting from above-mentioned second catoptrical and the corresponding component that diffuses in this of overall operation in stage.
By said structure, the cis 100 of present embodiment scans the whole surface of original paper P by making full rate assembly 13 move along the C direction, and generates the picture signal of original paper P.In the present embodiment, cis 100 is carried out the read operation (scan operation) of twice couple of original paper P, and generates based on reverberation L in this read operation
DrPicture signal and based on reverberation L
SrPicture signal.Generating based on reverberation L
DrPicture signal the time, control section moves to position shown in Figure 2 with rotatable reflector 135, and is generating based on reverberation L
SrPicture signal the time, control section with rotatable reflector 135 move among Fig. 2 by 135 ' expression the position.Then, control section is from based on reverberation L
SrPicture signal obtain gloss information, and this gloss information is superimposed upon from based on reverberation L
DrThe colouring information that obtains of picture signal on.
Wherein, which district of " gloss information " presentation video data has the glossiness in gloss (hereinafter referred to as " gloss district ") and this gloss district.For example, " gloss information " expression is with respect to the glossiness based on 2 to 8 digital signal of RGB color of the pixel of correspondence image data.Corresponding to the reduction of glossiness, each pixel data adopts the value near " black (R=0, G=0, B=0) ".Control section utilizes the gloss district on this gloss information designate, the glossiness that obtains in this district to determine the color (for example, determining golden, silver color) in gloss district then and these information are added view data.Alternatively, for each pixel, control section can only be specified the gloss district based on 2 to 8 digital signal of G look, generates view data by only adding this glossiness thus.
The view data of Huo Deing contains the information (that is texture information) relevant for texture in this way.For this view data, for example,, can generate the image of the texture of having reproduced object (original paper) by in image processing system, the gloss district being applied given processing.Form at electrophotographic image under the situation of device, given processing to the gloss district for example is meant following processing, wherein, use the color toner of common C (green grass or young crops), M (magenta), Y (Huang), K (deceiving) on paper, to form image, in the gloss district, form the transparent toner floor then, at last, under HTHP, fix this image and give gloss with surface to the image that forms, or following processing, wherein, use the toner of metallochrome (as gold, silver etc.) to form the metal image of gold or silver color.
Second embodiment
Next, the present invention's second exemplary embodiment is described.The difference of the above-mentioned cis 100 of the cis of present embodiment (hereinafter referred to as " cis 200 ") and first embodiment only is the structure of full rate assembly.Therefore, below only the structure of full rate assembly is described, and the component part identical with the component part of first embodiment given identical label and omitted explanation to them.
Fig. 4 shows the structure of the full rate assembly 23 of this embodiment.As shown in the figure, full rate assembly 23 comprises light source 131, prism 232 and rotatable light trap 233.
Prism 232 is polygonal prisms, by (for example by glass material with low-refraction and low diffusion, the BK7 that makes by SCHOTT AG etc.) apply mirror layer, half-transmitting mirror layer, anti-reflecting layer etc. on the surface of a plurality of prisms of making, and, obtain this polygonal prism by bonding these layers of optical bonding material that use has the refractive index that equates basically with this glass material.Prism 232 is arranged to cover and the perpendicular direction of the paper of Fig. 4, and have and the width of concora crush glass 11 equal widths basically, and by use optical adhesive, along surperficial BE four prism type glass material 232a (it has summit A, B, E, F on cross section) and four prism type glass material 232b (it has summit B, C, D, E on the cross section) being glued together forms prism 232.In addition, for example, by vapour deposition will approach that aluminium lamination covers the surperficial BC of the surfaces A B of glass material 232a and glass material 232b and with these surfaces as mirror.On the surface C D of glass material 232b, form anti-reflecting layer, in addition, will be laminated in surface C D, make surface C D can absorb the light that all is incident on basically on the surface C D thus by the sunken light spare 232t that black porous polyurethane sheet etc. forms.On the surperficial EF of the surperficial DE of glass material 232b and glass material 232a and FA, form anti-reflecting layer, make the optical axis of incident light and the angle that each surface forms become 0 °.In addition, on the adhesive surface BE of glass material 232a and glass material 232b, form half-transmitting mirror (semitransparent mirror) layer, with the antireflection part incident light and allow a part of incident light transmission.Because the structure of this half-transmitting mirror, along with the increase of the light reflectivity in front, the light transmission of its reverse side reduces.Therefore, when the full rate assembly 23 of design present embodiment, can select suitably to allow to read each catoptrical half-transmitting mirror by proper proportion.
On two surfaces of rotatable light trap 233, all be laminated with above-mentioned sunken light spare, and use axle 233a to make rotatable light trap 233 rotations by not shown driver element as axle.When rotatable light trap 233 is positioned at position along the surperficial EF of prism 232, rotatable light trap 233 absorbs diffusing from original paper P, and when rotatable light trap 233 is positioned at position along the surperficial DE of prism 232, the specular light that rotatable light trap 233 absorbs from original paper P.
Wherein, in the present embodiment, also can be arranged to equate with the optical path length that is used to read specular light with being used to read the optical path length that diffuses.That is, suppose that along the optical path length of optical axis surperficial EF of 232 from original paper P to prism be l
11, 232 surperficial EF is l to the optical path length of surperficial FA along optical axis from prism
12, be l along the optical path length of optical axis surperficial DE of 232 from original paper P to prism
21, 232 surperficial DE is l to the optical path length of surperficial FA along optical axis from prism
22, and the refractive index of prism is n, then can satisfy the relation by following formula 1 expression:
l
11+ nl
12=l
21+ nl
22(formula 1)
Cross sectional shape by adopting wherein glass material 232a and glass material 232b is the line symmetrical structure with respect to the extended line of surperficial BE, has satisfied this relation.
By using said structure, the cis 200 of present embodiment can be carried out the operation substantially the same with the cis 100 of first embodiment.In cis 200, when generating based on the first catoptrical picture signal, control section moves to rotatable light trap 233 along the position of the surperficial DE of prism 232, and when generating based on the second catoptrical picture signal, control section moves to rotatable light trap 233 along the position of the surperficial EF of prism 232.
The 3rd embodiment
Next, the present invention's the 3rd exemplary embodiment is described.The cis of present embodiment (hereinafter referred to as " cis 300 ") is with the difference of the cis of above-mentioned first and second embodiment: can read first reverberation and second reverberation by single scan operation.In addition, the difference of the cis 300 of present embodiment and the cis 100 of first embodiment also only is the structure of full rate assembly, therefore, below only the structure of full rate assembly is described, and the component part identical with the component part of first and second embodiment given identical label and omitted explanation to them.
Fig. 5 is the figure of structure that the full rate assembly 33 of present embodiment is shown.As shown in the figure, full rate assembly 33 comprises light source 131, mirror 332,333 and half-transmitting mirror 334.Half-transmitting mirror 334 reflections are from the reverberation L of mirror 332
DrA part and fair reverberation L
DrTransmission, and allow reverberation L
SrA part of transmission and do not reflect reverberation L from mirror 333
SrA part.
In the cis 300 of present embodiment, will be from the reverberation L of original paper P
DrReflection and arrive the optical path length and reverberation L on the surfaces A B institute edge of half-transmitting mirror 334 on mirror 332 from original paper P
SrThe optical path length on reflection and 334 edges of arrival half-transmitting mirror is designed to equate on mirror 333, and passes through half-transmitting mirror 334 with reverberation L
DrWith reverberation L
SrCombine and be output as synthetic light.By making full rate assembly 33 have this structure, can receive simultaneously from diffusing and specular light that the same position of original paper P reflects.Therefore, the complex mathematical computing needn't be carried out and just view data can be easily formed with texture information.
Wherein, can be with the reverberation L that is incident on the mirror 333
SrThe angle θ that forms with respect to the normal of original paper P
2Be set to from the light L of light source 131
InIncidence angle θ
1Differ ± 5 ° value.Below its reason is described.
Here, describe in conjunction with above-mentioned Fig. 3.As shown in the figure, specular light has very strong directivity usually, and along with the peak of the increase specular light of surface gloss becomes steeper.Therefore, when the object on the surface that will have high gloss is used as original paper P, as angle θ
2With incidence angle θ
1Exist and concern θ
2=θ
1The time, have following possibility: the synthetic light intensity that linear imaging sensor 16 receives exceeds the limit that can read of linear imaging sensor 16.In the case, have saturation value, therefore, be difficult to correctly read and diffuse and specular light from sort signal from the intensity of the picture signal of linear imaging sensor 16 output.In order to prevent to reach capacity from the intensity of the signal of linear imaging sensor 16 outputs receiving the synthetic light time, mirror 333 can receive reverberation L by the angle that makes signal strength signal intensity less than maximum intensity
Sr, the synthetic light that has the intensity that can read the limit that does not exceed linear imaging sensor 16 with reception.By making reverberation L
SrThe angle θ that forms with respect to the normal of original paper P
2With light L from light source 131
InIncidence angle θ
1± 5 ° approximately of deviations, the intensity that can make the picture signal that is produced by synthetic light is less than maximum intensity.
Because this structure, the cis 300 of present embodiment can read first reverberation and second reverberation by single scan operation, and can obtain to have the view data of texture information under situation about not increasing sweep time of original paper.For example, wherein have only the given zone of image to have the high light pool and other districts have the original paper in low light level pool and carry out and read by 300 pairs of cis that use present embodiment, (gloss district) has the picture signal of wanting high intensity than the intensity in other districts (non-gloss district) can to obtain wherein have only above-mentioned given zone.The view data that obtains from this picture signal demonstrates above-mentioned gloss district than the bigger color value of maximum (that is the color value of " in vain ") that is considered to based on the color value of the first catoptrical colouring information.Therefore, above-mentioned by using " in vain " color value carries out the determining of gloss district at view data as threshold value, can apply given processing to the gloss district.For example, form in the device, consider such application, wherein, use common C, M, the color toner of Y, K on paper, to form image at non-gloss district, and use the metallochrome toner in the gloss district, to form metal image at electrophotographic image.
Alternatively, the cis 300 of present embodiment suitably can be applied to such situation, promptly, can predict the reflection case of specular light to a certain extent from the original paper surface reflection, for example, original paper is that situation or the original paper with printing paper of gloss is lusterless basically cloth.
The 4th embodiment
Next, the 4th exemplary embodiment of the present invention is described.The cis of present embodiment (hereinafter referred to as " cis 400 ") can read first reverberation and second reverberation by single scan operation by the mode identical with the cis 300 of above-mentioned the 3rd embodiment.
Be not limited to the layout of the foregoing description in the layout of mirror of full rate component internal etc., can conceive various modifications.The layout of present embodiment is at an example in these modifications.
Fig. 6 shows the structure of full rate assembly 43 of the cis 400 of present embodiment.As shown in the figure, full rate assembly 43 comprises light source 131, mirror 432,433,434,435 and half-transmitting mirror 436.By this structure, first reverberation (diffusing) reflects on mirror 432,433 and half-transmitting mirror 436 and is received by linear transducer 16, and second reverberation (specular light) reflect on mirror 434 and 435, see through half-transmitting mirror 436 and by linear imaging sensor 16 receptions.Wherein, in the case, the first catoptrical optical path length is equated with the second catoptrical optical path length.
Because this structure, cis 400 can read first reverberation and second reverberation by single scan operation.
Here,,, when receiving first reverberation and second reverberation simultaneously, cis 400 must prevent to reach capacity in conjunction with the 3rd embodiment explanation as above by the picture signal that first reverberation and the second catoptrical synthetic light are produced.Yet, as in conjunction with the 3rd embodiment explanation, when second reverberation by than making the big or slightly little slightly angle reflex time on mirror of angle can obtain maximum intensity, have following shortcoming: the object that has a low-luster when use (promptly, wherein be included in the very little object of ratio of the direct reflection light component in the synthetic light) during as original paper P, can not obtain texture information accurately.Therefore, the use to said method is limited to wherein the situation of the glossiness of tentative prediction original paper P to a certain extent.
As the countermeasure that solves this shortcoming, for example can use liquid crystal light valve.Liquid crystal light valve is can be by the voltage that applies being controlled the device that changes the optical transmission rate.
Fig. 7 illustrates the figure that the topology example of liquid crystal light valve 437 wherein is set in full rate assembly 43 shown in Figure 6.In the figure, first reverberation is advanced in the district of the inside of liquid crystal light valve 437 437a, and second reverberation is advanced in the district of the inside of liquid crystal light valve 437 437b.In liquid crystal light valve 437, the transmissivity of district 437a and district 437b is carried out independent control by applying different voltage.
Because this structure, the user of operation cis 400 for example can import the instruction that reduces to distinguish the transmissivity of 437b and increase the transmissivity of district 437a when carrying out the reading of original paper P with high gloss, perhaps can import the transmissivity that increases district 437b when carrying out the reading of original paper P with low-luster and reduce to distinguish the instruction of the transmissivity of 437a.
Here, each the liquid crystal light valve 437 of transmissivity that can change independently in first reverberation and second reverberation has been carried out above explanation.Yet, also can obtain in a way advantageous effects with the structure that changes the second catoptrical transmissivity only.In addition, liquid crystal light valve can be applied to other cis except that the cis 400 of present embodiment.
The 5th embodiment
Next, the 5th exemplary embodiment of the present invention is described.Cis (hereinafter referred to as " cis 500 ") according to present embodiment, can read first reverberation and second reverberation by single scan operation, have the substantially the same structure of structure simultaneously with the cis 200 of above-mentioned second embodiment.
Fig. 8 shows the structure of the full rate assembly 53 of present embodiment.As shown in the figure, full rate assembly 53 comprises light source 131 and prism 232.That is, by removing the full rate assembly 53 that rotatable light trap 233 constitutes present embodiment from the full rate assembly 23 of second embodiment.Here, in the present embodiment, the first catoptrical optical path length must equal the second catoptrical optical path length.
Because this structure, cis 500 have with the substantially the same structure of the structure of the cis 200 of second embodiment in can receive from first reverberation and second reverberation of the same position reflection of original paper P by the mode identical with the cis 300 of the 3rd embodiment.Therefore, can under the situation of not carrying out the complex mathematical computing, easily form view data with texture information.
In addition, can be only by from the full rate assembly 23 of second embodiment, removing the full rate assembly 53 that rotatable light trap 233 comes composing images reader 500.Promptly, when cis 500 also comprises rotatable light trap 233, cis 500 can receive first reverberation and second reverberation individually by the mode identical with above-mentioned second embodiment, and can receive first reverberation and the second catoptrical synthetic light simultaneously.Wherein, when receiving first reverberation and the second catoptrical synthetic light time, rotatable light trap 233 can be arranged in rotatable light trap 233 and neither interdict first reverberation and do not interdict the second catoptrical position again.
The 6th embodiment
Next, the 6th exemplary embodiment of the present invention is described.The cis of present embodiment (hereinafter referred to as " cis 600 ") can also adopt basic structure substantially the same with the cis of above-mentioned the 3rd embodiment and mode of operation.Yet the difference of the cis 600 of present embodiment and the cis of the 3rd embodiment is the quantity of mirror and the layout of mirror.That is, present embodiment is characterised in that first reverberation and the order of reflection of second reverberation on a plurality of mirrors.
Fig. 9 is that schematically illustrated full rate assembly 33 by the 3rd embodiment forms first reverberation of image and the figure of the second catoptrical reflection direction.In the figure, each arrow that illustrates on the light path is represented the vertical direction of original paper P, and wherein the direction that makes progress of original paper P is represented in the sensing of these arrows.
As shown in the figure, first reverberation reflects on mirror 332 and half-transmitting mirror 334,, has reflected twice altogether that is, and therefore, when from full rate assembly 33 outputs first reverberation, the last direction of original paper P down.On the other hand, second reverberation is only reflected once by mirror 333, and therefore, when from full rate assembly 33 outputs second reverberation, the last direction of original paper P up.That is, be appreciated that first reverberation is opposite with the second catoptrical image direction.When reading these two reverberation in this case simultaneously, be formed on the resolution deteriorates of the image on the linear imaging sensor 16, become the reason of the quality that has reduced reading images thus.
In order to make first reverberation identical, first reverberation can be arranged to equate by the order of reflection of a plurality of mirrorings with second reverberation by the order of reflection of a plurality of mirrorings with the second catoptrical image direction.For example, suppose first reverberation and second reverberation, when exporting first reverberation and second reverberation from the full rate assembly by a plurality of mirrorings twice, for first reverberation and second reverberation, the last direction of original paper P all down, therefore, it is identical that image direction becomes.
By identical mode, second reverberation reflects once on mirror even be appreciated that first reverberation to reflect three times on a plurality of mirrors, for first reverberation and second reverberation, the last direction of original paper P all up, therefore, each image direction becomes identical.That is, be appreciated that each image direction becomes identical when the first catoptrical order of reflection and the second catoptrical order of reflection all become odd number or even number.
Here, in above-mentioned explanation, only the light path before exporting each reverberation from the full rate assembly is illustrated mode of operation.Yet, in practical manner, must be based on by the first catoptrical order of reflection that produces from original paper P before linear imaging sensor 16 receptions first reverberation and determine with the second catoptrical order of reflection that before receiving second reverberation, produces whether image direction becomes identical from original paper P by linear imaging sensor 16.Yet identical with the second catoptrical synthetic light and their light path from only first reverberation of full rate assembly output, therefore, the order of reflection in full rate assembly subsequently equates naturally.Therefore, if these catoptrical order of reflection become identical export first reverberation and second reverberation from the full rate assembly before, then the order of reflection that each reverberation reflects before receiving each light by linear imaging sensor 16 also becomes identical.
In view of above description, the full rate assembly of the cis 600 of present embodiment is described.
Figure 10 is the figure of structure that the full rate assembly 63 of this exemplary embodiment is shown.As shown in the figure, full rate assembly 63 comprises light source 131, mirror 632,633,634 and half-transmitting mirror 635.In this full rate assembly 63, first reverberation reflects on mirror 632,633 and half-transmitting mirror 635, and therefore, its order of reflection becomes and is total up to three times.On the other hand, second reverberation reflects on mirror 634, and therefore, its order of reflection is for once.That is, the first catoptrical order of reflection and the second catoptrical order of reflection are odd number, therefore, are appreciated that each the catoptrical image direction that is received by linear imaging sensor 16 becomes identical.
Also design of Optical System can be become make the reverberation of winning become identical with the second catoptrical image direction in other embodiments, and be not limited only to present embodiment.
The 7th embodiment
Next, the 7th exemplary embodiment of the present invention is described.Same in the cis (hereinafter referred to as " cis 700 ") of present embodiment, by the mode identical, make first reverberation that receives by linear imaging sensor 16 identical with the second catoptrical image direction with the cis 600 of the foregoing description 6.Present embodiment shows the modification of the situation that wherein first reverberation and the second catoptrical image direction become identical.
Figure 11 is the figure of an example of structure that the full rate assembly 73 of present embodiment is shown.Full rate assembly 73 comprises light source 131, mirror 732,733,734, half-transmitting mirror 735 and light trap 736.In full rate assembly 73, first reverberation reflects on mirror 732 and half-transmitting mirror 735, and second reverberation reflects on mirror 733 and 734.That is, each catoptrical order of reflection is twice,, is even number that is, therefore, is appreciated that each the catoptrical image direction that is received by linear imaging sensor 16 becomes identical.
Here, press and the identical mode of above-mentioned second embodiment, the structure that comprises prism can be set be substituted by mirror and the half-transmitting mirror that full rate assembly 73 is provided with.
Figure 12 is the figure that the full rate assembly 73 ' that comprises prism in the present embodiment is shown.In the figure, full rate assembly 73 ' comprises light source 131 and prism 737.The cross section of prism 737 is the heptagons with summit A, B, C, D, E, F, G, and the aluminium film vapour deposition that wherein will have the mirror function is to surfaces A B, CD, DE.In addition, with the figure of surperficial DE in 736 corresponding parts on form anti-reflection layer and light trap 736 be adhered to this part.Because said structure, full rate assembly 73 ' can obtain the advantage substantially the same with above-mentioned full rate assembly 73.
As mentioned above, below aspects more of the present invention are summarized.
According to one aspect of the invention, a kind of cis, it comprises: lighting unit, it uses rayed object to be read; First optical system, its permission is advanced therein from first reverberation of object to be read; Second optical system, its permission is advanced therein from second reverberation of object to be read; Switch unit, it switches between first optical system that will use and second optical system; Image-generating unit, it switches between first optical system and second optical system by switch unit be formed on first catoptrical image of advancing in first optical system and the second catoptrical image of advancing in second optical system; And light receiving unit, its reception forms first reverberation and second reverberation of a plurality of images and generates image signals corresponding.
This cis can generate first reverberation (read diffuse from it) and second reverberation (reading specular light from it) based on the light from same illumination unit, and can receive this first reverberation and second reverberation by same light receiving unit.Therefore, this cis can be carried out reading texture information by simpler structure compared with prior art.In addition, this cis is carried out twice read operation and is calculated colouring information and texture information based on two kinds of image informations, therefore, can obtain colouring information and texture information more accurately.
In this cis, can with in first optical system, advance, the first catoptrical optical path length before being received by light receiving unit with in second optical system, advance, up to being arranged to equate by the second catoptrical optical path length before the light receiving unit reception.
Because this structure, the possibility that does not have the focal position skew of the focal position of first reverberation (read diffuse from it) and second reverberation (reading specular light) from it, therefore, needn't the mechanism that regulate focal position be set in the light receiving unit side.
According to a further aspect of the invention, a kind of cis, it comprises: lighting unit, it uses rayed object to be read; First optical system, its permission is advanced therein from first reverberation of object to be read; Second optical system, its permission is advanced therein from second reverberation of object to be read; The reverberation synthesis unit, first reverberation that it will be advanced in first optical system and second reverberation of advancing in second optical system are output as synthetic light; Image-generating unit, it forms from the image of the synthetic light of reverberation synthesis unit output; And light receiving unit, its reception is formed the synthetic light of image and is generated picture signal by image-generating unit.
This cis can generate based on the light that generates from same lighting unit and diffuse and specular light, and can receive this by same light receiving unit and diffuse and specular light.Therefore, this cis can pass through compared with prior art simpler structure acquisition texture information.In addition, this cis can receive the synthetic light that diffuses with specular light by single read operation, and therefore, compared with prior art, this cis can obtain texture information quickly.
Wherein, in above-mentioned many aspects, described cis can comprise the variable transmission unit, the optical transmission rate on this variable transmission unit change at least one light path in the first catoptrical light path and the second catoptrical light path.
Because this structure, even the intensity of first and second reverberation (reading diffuse reflection and specular light from them) is very strong, can prevent also that described synthetic light from exceeding reads the limit, and this reads the limit is saturated causing by the signal output of the photo-electric conversion element that constitutes light receiving unit etc.In addition,, can regulate arbitrarily, therefore, can regulate glossiness, allow input to be suitable for reproducing the information of better texture thus first reverberation and the second catoptrical light amount ratio according to this structure.
In addition, in above-mentioned many aspects, receiving from the reflection of light number of times before first reverberation of original paper by light receiving unit and can be even number or odd number from the reflection of light number of times before second reverberation of original paper by the light receiving unit reception.
Because this structure can make the image direction of the image light that obtains by diffusing aim at mutually with the image direction of the image light that obtains by specular light, therefore, can import the information about original paper more accurately.
Provided above-mentioned explanation with illustrative purposes presented for purpose of illustration to a plurality of embodiment of the present invention.Be not intended to exhaustive or limit the invention to disclosed precise forms.Obviously, those skilled in the art is with obvious many modifications and modified example.To embodiment to choose with purpose of description be to set forth principle of the present invention and practical application thereof, thereby make others skilled in the art can be in various embodiments and the various modifications of the concrete application of being conceived to be suitable for understand the present invention.Scope of the present invention is limited by claims and equivalent thereof.
By reference, whole disclosures (comprising specification, claims, accompanying drawing and summary) of the Japanese patent application No.2004-316763 that on October 29th, 2004 was submitted to are incorporated into this.
Claims (22)
1, a kind of cis, it comprises:
Lighting unit, it uses rayed object to be read;
First optical system, it makes and can advance therein from first reverberation of described object to be read;
Second optical system, it makes and can advance therein from second reverberation of described object to be read;
Switch unit, it switches between described first optical system that will use and described second optical system;
Image-generating unit, it switches between described first optical system and described second optical system by utilizing described switch unit, is formed on first catoptrical image of advancing in described first optical system and the second catoptrical image of advancing in described second optical system; And
Light receiving unit, its reception forms described first reverberation and described second reverberation of a plurality of images and generates image signals corresponding by described image-generating unit.
2, cis according to claim 1, wherein, described light receiving unit catoptrically diffuses and generates image signals corresponding from the described second catoptrical specular light by reading from described first.
3, cis according to claim 1, wherein, each in described first optical system and described second optical system all comprises mirror.
4, cis according to claim 1, wherein, each in described first optical system and described second optical system all comprises mirror and half-transmitting mirror.
5, cis according to claim 1, wherein, each in described first optical system and described second optical system all comprises the surface of prism.
6, cis according to claim 1, wherein, will in described first optical system, advance, the described first catoptrical optical path length before being received by described light receiving unit with in described second optical system, advance, up to being arranged to equate by the described second catoptrical optical path length before the described light receiving unit.
7, cis according to claim 1 wherein, is arranged at the variable transmission unit that changes the optical transmission rate at least one light path in the described first catoptrical light path and the described second catoptrical light path.
8, cis according to claim 1, wherein, number of times that this first reverberation is reflected before receiving from described first reverberation of described object to be read by described light receiving unit and this second reverberation is reflected before receiving from described second reverberation of described object to be read by described light receiving unit inferior number average are set to even number or odd number.
9, cis according to claim 1, wherein, described first reverberation has with respect to the about 0 ° angle of reflection of incidence angle from the irradiates light of described lighting unit, and described second reverberation has with respect to the about 45 ° angle of reflection of incidence angle from the irradiates light of described lighting unit.
10, cis according to claim 1 also comprises output unit, and the picture signal that this output unit utilizes described light receiving unit to generate is exported based on the first catoptrical information with based on the second catoptrical information.
11, cis according to claim 10, wherein, described output unit utilizes described picture signal output based on the described first catoptrical colouring information with based on the described second catoptrical texture information.
12, a kind of cis, it comprises:
Lighting unit, it uses rayed object to be read;
First optical system, it makes and can advance therein from first reverberation of described object to be read;
Second optical system, it makes and can advance therein from second reverberation of described object to be read;
The reverberation synthesis unit, described first reverberation that it will be advanced in described first optical system and described second reverberation of advancing in described second optical system are output as synthetic light;
Image-generating unit, it forms from the image of the synthetic light of this reverberation synthesis unit output; And
Light receiving unit, its reception is formed the synthetic light of image and is generated picture signal by described image-generating unit.
13, cis according to claim 12 wherein, is arranged in described reverberation synthesis unit the position that makes the first catoptrical optical path length and the second catoptrical optical path length become and equate.
14, cis according to claim 12, wherein, described light receiving unit reads from described first reverberation that constitutes described synthetic light and diffuses, and reads specular light from described second reverberation that constitutes described synthetic light, and generates image signals corresponding.
15, cis according to claim 12, wherein, each in described first optical system and described second optical system all comprises mirror.
16, cis according to claim 12, wherein, described reverberation synthesis unit comprises half-transmitting mirror.
17, cis according to claim 12, wherein, each in described first optical system, described second optical system and the described reverberation synthesis unit all comprises the surface of prism.
18, cis according to claim 12 wherein, is arranged at the variable transmission unit that changes the optical transmission rate at least one light path in the described first catoptrical light path and the described second catoptrical light path.
19, cis according to claim 12, wherein, number of times that this first reverberation is reflected before receiving from described first reverberation of described object to be read by described light receiving unit and this second reverberation is reflected before receiving from described second reverberation of described object to be read by described light receiving unit inferior number average are set to even number or odd number.
20, cis according to claim 12, wherein, the angle that described first reverberation and described second reverberation form differs ± 5 ° of pacts with light from described lighting unit with the angle that first reverberation forms.
21, cis according to claim 12, also comprise output unit, the picture signal that this output unit utilizes described light receiving unit to generate is exported based on the described first catoptrical information that constitutes described synthetic light with based on the described second catoptrical information that constitutes described synthetic light.
22, cis according to claim 21, wherein, described output unit utilizes described picture signal output based on the described first catoptrical colouring information that constitutes described synthetic light with based on the described second catoptrical texture information that constitutes described synthetic light.
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| CN102842023A (en) * | 2011-03-29 | 2012-12-26 | 计量仪器公司 | Hybrid-type bioptical laser scanning and imaging system supporting digital-imaging based bar code symbol reading at the surface of a laser scanning window |
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| CN102842023A (en) * | 2011-03-29 | 2012-12-26 | 计量仪器公司 | Hybrid-type bioptical laser scanning and imaging system supporting digital-imaging based bar code symbol reading at the surface of a laser scanning window |
| CN102842023B (en) * | 2011-03-29 | 2017-04-12 | 计量仪器公司 | Hybrid-type bioptical laser scanning and imaging system supporting digital-imaging based bar code symbol reading at the surface of a laser scanning window |
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