CN108429869B - Image reading apparatus - Google Patents
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- CN108429869B CN108429869B CN201810241856.6A CN201810241856A CN108429869B CN 108429869 B CN108429869 B CN 108429869B CN 201810241856 A CN201810241856 A CN 201810241856A CN 108429869 B CN108429869 B CN 108429869B
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- 239000002699 waste material Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
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Classifications
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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
- H04N1/02895—Additional elements in the illumination means or cooperating with the illumination means, e.g. filters
Abstract
The invention provides an image reading device, which is used for reading an optical image on an original, and comprises a frame body, a light source structure and a light condensing part, wherein the light source structure is arranged on the frame body and is used for emitting light rays to the original, the light condensing part is arranged opposite to the light source structure and is positioned on a propagation path of the light rays emitted by the light source structure, and the light condensing part is used for converging the light rays transmitted through the light condensing part so as to increase the quantity of the light rays reaching the optical image of the original. The invention solves the problems that the image reading device in the prior art has lower utilization rate of light rays emitted by a light source structure, thereby not only causing energy waste, but also reducing the reading accuracy of the image reading device to the light image of the manuscript.
Description
Technical Field
The present invention relates to the field of image sensors, and more particularly, to an image reading apparatus.
Background
In the conventional image reading apparatus, light is generally emitted to an original by a light source structure, and after the light emitted from the light source structure reaches the original, the light is transmitted through the original or reflected on the surface of the original, and then the image reading apparatus collects and analyzes the transmitted light transmitted through the original or the reflected light reflected by the surface of the original, thereby reading an optical image on the original.
When the light emitted by the light source structure of the conventional image reading device reaches the original, only part of the light is positioned in the reading area, the rest of the light irradiates outside the reading area, and part of the light positioned outside the reading area cannot be utilized by the image reading device, and energy waste is caused. When the light intensity of the light source structure is fixed, the quantity of light rays in the reading area is smaller, and the brightness in the reading area is lower, so that an optical image of an original obtained by the image reading device is easy to be excessively dark, and the accuracy of the image reading device for reading the optical image of the original is reduced.
Disclosure of Invention
The invention mainly aims to provide an image reading device, which solves the problems that the image reading device in the prior art has lower utilization rate of light rays emitted by a light source structure, so that energy waste is caused, and the reading accuracy of the image reading device to an original is reduced.
In order to achieve the above object, the present invention provides an image reading apparatus for reading an optical image on an original, comprising: a frame; a light source structure disposed on the frame for emitting light to the original; the condensing part is arranged opposite to the light source structure and is positioned on the propagation path of the light rays emitted by the light source structure, and the condensing part is used for converging the light rays transmitted through the condensing part so as to increase the quantity of the light rays reaching the light image of the original.
Further, the light condensing part comprises a substrate and a plurality of light condensing teeth arranged on the substrate, the plurality of light condensing teeth are sequentially arranged along the width direction of the substrate, and each light condensing tooth continuously extends along the length direction of the substrate.
Further, the lower surface of the substrate facing the light source structure is a plane, and the light focusing teeth are arranged on the upper surface of the substrate facing away from the light source structure.
Further, the plurality of light condensing teeth include a first light condensing tooth group and a second light condensing tooth group, and the plurality of light condensing teeth of the first light condensing tooth group and the plurality of light condensing teeth of the second light condensing tooth group are symmetrically arranged at two sides of the midpoint of the wide edge of the substrate.
Further, the cross-sectional shape of the light-gathering teeth perpendicular to the length direction thereof is a right triangle, and the widths of the light-gathering teeth are equal, the heights of the plurality of light-gathering teeth of the first light-gathering tooth group gradually decrease along the direction towards the midpoint of the wide side of the substrate, and the heights of the plurality of light-gathering teeth of the second light-gathering tooth group gradually decrease along the direction towards the midpoint of the wide side of the substrate.
Further, the condensing part is used for converging the light beam passing through the condensing part to a condensing point F, the first right-angle side of the right-angle triangle is positioned on the upper surface of the substrate, the second right-angle side of the right-angle triangle is perpendicular to the upper surface of the substrate, the included angle between the hypotenuse of the right-angle triangle and the first right-angle side is alpha, and the magnitude of the included angle alpha meets the following equation:
β＝90°+α-arcsin[msin(α-arcsin(sinγ/m))] (1)；
β＝arctan(n-0.5)a/f (2)；
γ＝arctan(n-0.5)a/h (3)；
wherein, gamma is the incident angle when the light is refracted at the lower surface of the substrate; beta is the included angle between the reverse extension line of the refracted ray and the lower surface of the substrate when the ray is refracted at the hypotenuse of the right triangle; a is the length of a first right-angle side of the right triangle; n is the nth concentrating tooth of the plurality of concentrating teeth, which is located at a distance from the midpoint of the broadside of the substrate; f is the distance between the first right-angle side and the converging point F; h is the distance between the light source structure and the lower surface of the substrate; m is the refractive index of the light condensing portion.
Further, the base plate and the light condensing teeth are of an integral structure, and the base plate and the light condensing teeth are made of glass or transparent plastic.
Further, the light condensing part is a convex lens or a fresnel lens.
Further, the image reading apparatus is a transmissive image reading apparatus, and the frame includes a first frame and a second frame, which are disposed opposite to each other to form a rest space therebetween for placing an original, wherein the light source structure and the light condensing portion are disposed in the first frame, and the image reading apparatus further includes a lens and a photosensitive chip disposed in the second frame in order along a propagation path of light.
Further, the light source structure includes: the light guide column is provided with a light emitting surface; and the light emitting units are arranged at two ends of the light guide column.
Further, the image reading device is a reflective image reading device, the image reading device further comprises a lens and a photosensitive chip, the lens and the photosensitive chip are arranged in the frame, the light source structure and the light condensing part are two, and the two light source structures and the two light condensing parts are arranged in one-to-one correspondence and are respectively positioned at two sides of the lens.
Further, the light source structure includes: the mounting plate is positioned on one side of the lens and is arranged at an included angle with the lens; and the light-emitting unit is arranged on the mounting plate.
Further, the frame body comprises a first frame body and a second frame body, the first frame body and the second frame body are oppositely arranged to form a placing space for placing an original document between the first frame body and the second frame body, the light source structure comprises a transmission light source structure and a reflection light source structure, wherein the transmission light source structure is arranged in the first frame body, the reflection light source structure is arranged in the second frame body, the image reading device further comprises a lens and a photosensitive chip, and the lens and the photosensitive chip are sequentially arranged in the second frame body along the transmission path of light rays emitted by the transmission light source structure.
By adopting the technical scheme of the invention, the light condensing part is arranged on the propagation path of the light emitted by the light source structure, so that the light emitted by the light source structure firstly passes through the light condensing part, the light beams passing through the light condensing part are converged by the light condensing part, and then the light beams are emitted to the original, so that under the condition that the light intensity provided by the light source structure is fixed, the quantity of the light reaching the reading area of the image reading device is increased, the light intensity in the reading area is improved, the light image of the original positioned in the reading area is favorably illuminated, the image reading device can obtain the clear light image of the original, the reading accuracy of the image reading device on the light image of the original is improved, and the working reliability of the image reading device is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic configuration diagram of an image reading apparatus according to a first embodiment of the present invention;
fig. 2 shows a schematic configuration diagram of an image reading apparatus according to a second embodiment of the present invention;
fig. 3 shows a schematic configuration diagram of an image reading apparatus according to a third embodiment of the present invention;
FIG. 4 shows a front view of an alternative embodiment of the condensing portion of the image reading device of the present invention;
FIG. 5 shows a top view of the condensing portion of FIG. 4;
fig. 6 shows a schematic diagram of the operation of the condensing part in fig. 4;
FIG. 7 shows an enlarged schematic view at A in FIG. 6;
fig. 8 shows a light intensity distribution simulation diagram of an image reading apparatus in the related art;
fig. 9 shows a light intensity distribution simulation of the image reading apparatus of the present application with a light condensing portion.
Wherein the above figures include the following reference numerals:
100. an original document; 10. a frame; 11. a first frame; 12. a second frame; 20. a light source structure; 21. a light guide column; 22. a light emitting unit; 23. a mounting plate; 24. a transmissive light source structure; 25. a reflective light source structure; 30. a light-gathering section; 31. a substrate; 311. a lower surface; 312. an upper surface; 32. concentrating teeth; 33. a first right-angle side; 34. a second right angle side; 35. a beveled edge; 40. a lens; 50. a photosensitive chip; 60. a reflective pattern; 70. a control circuit board; 80. an external power supply structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an image reading device, which aims to solve the problems that the image reading device in the prior art has lower utilization rate of light rays emitted by a light source structure, so that energy waste is caused, and the reading accuracy of the image reading device to an original light image is reduced.
As shown in fig. 1 to 3, the present application provides an image reading apparatus for reading a light image on an original 100, including a frame 10, a light source structure 20 and a light condensing portion 30, the light source structure 20 is disposed on the frame 10 for emitting light to the original 100, the light condensing portion 30 is disposed opposite to the light source structure 20 and is located on a propagation path of the light emitted from the light source structure 20, and the light condensing portion 30 is for condensing the light beams transmitted therethrough to increase the number of light rays reaching the light image of the original 100.
In this application, through set up spotlight portion 30 on the propagation path of the light that light source structure 20 sent, make the light that light source structure 20 sent see through spotlight portion 30 first, spotlight portion 30 makes the light beam that sees through it assemble, light beam assemble the back and launch to manuscript 100, thereby under the circumstances that the light intensity that light source structure 20 provided is certain, increased the quantity of the light that reaches image reading device's reading region department, promoted the light intensity in the reading region, thereby be favorable to being located the light image of manuscript 100 in the reading region and illuminated, make image reading device can obtain clear light image of manuscript 100, the reading accuracy of image reading device's light image to manuscript 100 has been promoted, image reading device's operational reliability has been improved.
Fig. 4 and 5 show an alternative embodiment of the light condensing part 30, and in particular, the light condensing part 30 includes a base plate 31 and a plurality of light condensing teeth 32 provided on the base plate 31, the plurality of light condensing teeth 32 being disposed in sequence along a width direction of the base plate 31, each light condensing tooth 32 extending continuously along a length direction of the base plate 31. Thus, the light emitted by the light source structure 20 is refracted for the first time when being emitted into the substrate 31 from the air, and refracted for the second time when being emitted into the air from the light gathering teeth 32, so that the light emitting angle is changed, the light gathering effect is realized, more light reaches the reading area, the light is utilized by the image reading device, and the utilization rate of the light emitted by the light source structure by the image reading device is improved.
As shown in fig. 4 and 5, the lower surface 311 of the substrate 31 facing the light source structure 20 is a plane, and the light concentrating teeth 32 are disposed on the upper surface 312 of the substrate 31 facing away from the light source structure 20. In this way, when the light emitted by the light source structure 20 reaches the lower surface 311 of the substrate 31, the light is refracted for the first time, and the light is refracted for the second time at the contact surface of the light-gathering tooth 32 and the air, so that the light beam gathering effect is realized by using the two refractions of the light.
As shown in fig. 4 and 5, the plurality of light condensing teeth 32 includes a first light condensing tooth group and a second light condensing tooth group, and the plurality of light condensing teeth 32 of the first light condensing tooth group and the plurality of light condensing teeth 32 of the second light condensing tooth group are symmetrically disposed at both sides of a midpoint of the wide side of the base plate 31.
As shown in fig. 4 to 7, the cross-sectional shape of the light-collecting teeth 32 perpendicular to the longitudinal direction thereof is a right triangle, and the width of each light-collecting tooth 32 is equal, the height of the plurality of light-collecting teeth 32 of the first light-collecting tooth group gradually decreases in a direction toward the midpoint of the wide side of the substrate 31, and the height of the plurality of light-collecting teeth 32 of the second light-collecting tooth group gradually decreases in a direction toward the midpoint of the wide side of the substrate 31. By reasonably optimizing the heights of the plurality of condensing teeth 32 and arranging the condensing teeth 32 of different heights, the condensing portion 30 is reliably caused to converge the light beam transmitted therethrough, specifically, in the present embodiment, the light beam transmitted through the condensing portion 30 is converged to the condensing point F as shown in fig. 6.
Fig. 6 and 7 show the operation principle of the light-condensing unit 30, in which the light source structure 20 has one light-emitting point O, and the light-condensing point F is the converging point of the light beam transmitted through the light-condensing unit 30 in an ideal state, and the light emitted from the light source structure 20 is refracted twice when transmitted through the light-condensing unit 30, and then irradiates the light-condensing point F.
As shown in fig. 6 and 7, the condensing portion 30 is configured to condense the light beam passing therethrough to a condensing point F, a first right-angle side 33 of a right triangle is located on an upper surface 312 of the substrate 31, a second right-angle side 34 of the right triangle is perpendicular to the upper surface 312 of the substrate 31, an included angle α between a hypotenuse 35 of the right triangle and the first right-angle side 33 is defined as α, and the magnitude of the included angle α satisfies the following equation:
β＝90°+α-arcsin[msin(α-arcsin(sinγ/m))] (1)；
β＝arctan(n-0.5)a/f (2)；
γ＝arctan(n-0.5)a/h (3)；
where γ is the incident angle at which light is refracted at the lower surface 311 of the substrate 31; beta is the angle between the reverse extension line of the refracted ray when the ray is refracted at the hypotenuse 35 of the right triangle and the lower surface 311 of the substrate 31; a is the length of the first right side 33 of the right triangle; n is an nth light concentrating tooth 32 of the plurality of light concentrating teeth 32 from a midpoint of the wide side of the substrate 31; f is the distance between the first right-angle side 33 and the converging point F; h is the distance between the light source structure 20 and the lower surface 311 of the substrate 31; m is the refractive index of the light condensing portion 30.
The above formula is calculated by taking the midpoint of the hypotenuse of the triangle as an example, and theoretically, the light refracted at other positions of the hypotenuse cannot be irradiated to the converging point F, but the number of light rays reaching the reading area of the image reading apparatus can be effectively increased by converging the light rays by the converging portion 30 of the image reading apparatus of the present application within the range allowed by the optical field. It should be further noted that the small deviation between the refracted light ray at the other position of the hypotenuse and the convergence point F does not affect the use effect of the present application.
For ease of calculation and machining, the length of the first right-angle sides 33 of all the light-gathering teeth 32 is the same, i.e. the length of the first right-angle sides 33 is a. Therefore, the exit angle of the light after the second refraction can be adjusted only by optimally designing the included angle between the hypotenuse 35 of the right triangle and the first right triangle 33 to be alpha, that is, the direction of the light after the light passes through the light gathering part 30 and is refracted twice is controlled, so that the light is gathered to the light gathering point F.
Optionally, the value range of a is more than or equal to 0.1mm and less than or equal to 1mm; the higher the convergence accuracy required, the smaller the value of a.
In consideration of the economic cost of processing the light condensing portion 30 and the light condensing effect, the value of a may be selected to be a large value within the above range in practical use.
Alternatively, the distance h between the light source structure 20 and the lower surface 311 of the substrate 31 may range from 0mm or more to 10mm or less.
As shown in fig. 6, L is a distance between the light-emitting point O and the surface of the original 100 near the light source structure 20. The size of the reading area of the image reading apparatus is related to the distance between the reference plane carrying the original 100 and the light condensing portion 30, while the distance between the light emitting point O and the light condensing portion 30 is kept constant, and the smaller the area of the reading area of the image reading apparatus is, the smaller the distance between the reference plane carrying the original 100 and the light condensing portion 30 is, and the larger the area of the reading area of the image reading apparatus is. Preferably, the axes of the light source structure, the light condensing portion 30, the lens 40, and the photosensitive chip 50 coincide.
Fig. 8 is a light intensity distribution simulation diagram of an image reading apparatus according to the prior art, fig. 9 is a light intensity distribution simulation diagram of the image reading apparatus with a condensing portion, in fig. 8, the abscissa of the light intensity distribution simulation diagram means an angle between light emitted from a light source structure 20 and an axis of the light source structure 20, in fig. 9, the abscissa of the light intensity distribution simulation diagram means an angle between light emitted from the light source structure 20 after being condensed by the condensing portion 30 and an axis of the light source structure 20, and in fig. 8 and 9, the ordinate of the light intensity distribution simulation diagram means a luminous flux per unit area in a reading area of the image reading apparatus, as can be seen from comparison of fig. 8 and 9, a distribution range after light beam condensation is narrowed, but a luminous flux per unit area is increased, and a maximum luminous flux per unit area is 0.88W/m as shown in fig. 8 2 As shown in FIG. 9, in one embodiment of the present application, the maximum luminous flux per unit area is 21.8W/m 2 The maximum luminous flux per unit area in the reading area of the image reading apparatus of the present application is improved by about 24.77 times as compared with the maximum luminous flux per unit area in the reading area of the image reading apparatus without the condensing portion 30.
Therefore, on the premise that the brightness of a reading area of the image reading device is required to be ensured to be constant, the image reading device can be used for reducing the number of LED chips in the light source structure and reducing the overall processing and manufacturing cost of the image reading device. Likewise, with the image reading apparatus of the present application, the brightness in the reading area is effectively enhanced, so, in order to ensure that the brightness in the reading area of the image reading apparatus remains at the original brightness in the design of the image reading apparatus, in the image reading apparatus of the alternative embodiment shown in fig. 1, the distance between the light source structure 20 and the photosensitive chip 50 may be increased, so that the image reading apparatus may read a larger-sized light image on the original 100.
Optionally, the substrate 31 and the light focusing teeth 32 are integrally formed, so that the light focusing part 30 is convenient to process and manufacture, and the substrate and the light focusing teeth are made of glass or transparent plastic, and the light focusing effect on the light beam is realized by utilizing the characteristics that the light transmittance and the refractive index of the glass or the transparent plastic are larger than those of air.
In an unillustrated embodiment of the present application, the light condensing portion 30 is a convex lens or a fresnel lens. The converging effect on the light beam can be also achieved by using a convex lens or a Fresnel lens.
The embodiment of the condensing part 30 shown in fig. 4 to 5 is more reasonable in structure than the embodiment of the convex lens or the fresnel lens in the case of the same condensing action, and can be applied to an image reading apparatus having a compact structure.
Specific embodiments of the image reading apparatus of different configurations to which the light condensing unit 30 described above is attached will be described in detail below.
Example 1
As shown in fig. 1, the image reading apparatus in the present embodiment is a transmissive image reading apparatus, the frame 10 includes a first frame 11 and a second frame 12, the first frame 11 and the second frame 12 are disposed opposite to each other to form a rest space therebetween for placing an original 100, wherein a light source structure 20 and a light condensing portion 30 are disposed in the first frame 11, the image reading apparatus further includes a lens 40 and a photosensitive chip 50, and the lens 40 and the photosensitive chip 50 are disposed in the second frame 12 in this order along a propagation path of light.
In this way, the light beam emitted from the light source structure 20 is converged by the light converging portion 30 and then emitted to the original 100, part of the light is transmitted through the original 100, the lens 40 collects the transmitted light transmitted through the original 100, and irradiates the transmitted light onto the photosensitive chip 50, and the photosensitive chip 50 is used for analyzing the transmitted light to obtain a light image of the original 100.
It should be noted that, the parking space referred to in this application is for parking the original 100, the reading area is located in the parking space, and only a portion of the light beam located in the reading area of the light beam emitted by the light source structure 20 can be collected by the lens 40, that is, the image reading apparatus can effectively read the light image of the original 100.
Specifically, in the alternative embodiment shown in fig. 1, the original 100 moves continuously from left to right or from right to left in the rest space, the image reading apparatus reads an optical image of the original 100 located in the reading area, that is, after the lens 40 collects the transmitted light transmitted through the original 100, the transmitted light is irradiated onto the photosensitive chip 50, and the photosensitive chip 50 can obtain a continuous optical signal and convert the continuous optical signal into an electrical signal, and then analyze and process the electrical signal with software to obtain the optical image of the original 100.
The brightness in the reading area of the image reading device provided by the embodiment is larger, and the loss of light in the propagation process can be compensated, so that when the distance D between the first frame 11 and the second frame 12 is larger, the image reading device can still ensure the reading accuracy of the light image of the original.
In an alternative embodiment shown in fig. 1, the light source structure 20 includes a light guiding pillar 21 and light emitting units 22, the light guiding pillar 21 having a light emitting surface, the light emitting units 22 being disposed at both ends of the light guiding pillar 21. The light emitted from the light emitting unit 22 enters the light guide column 21, and is uniformly emitted from the light exit surface of the light guide column 21 toward the document 100.
Alternatively, the light emitted from the light emitting unit 22 may be monochromatic or may be a combination of several colors, and may be visible light or invisible light.
Alternatively, the light emitting unit 22 is an LED chip.
The cross-sectional shape of the light guide column 21 may be varied, such as rectangular, diamond-shaped, circular, etc. In an alternative embodiment shown in fig. 1 of the present application, the cross-sectional shape of the light guiding column 21 is circular.
Optionally, the image reading apparatus further includes a reflective pattern 60, where the reflective pattern 60 is disposed on a side of the light guide pillar 21 away from the light condensing portion 30, and the light emitted by the light emitting unit 22 is reflected by the reflective pattern 60 and then emitted by the light emitting surface of the light guide pillar 21 toward the original 100.
Optionally, the image reading apparatus further includes a control circuit board 70 and an external power supply structure 80, the control circuit board 70 is connected with the light emitting unit 22, the external power supply structure 80 is used for supplying power to the light emitting unit 22, and the control circuit board 70 is used for controlling the light emitting state and the light emitting intensity of the light emitting unit 22.
Example two
As shown in fig. 2, the image reading apparatus in this embodiment is a reflective image reading apparatus, and the image reading apparatus further includes a lens 40 and a photosensitive chip 50, where the lens 40 and the photosensitive chip 50 are disposed in the frame 10, and the light source structure 20 and the light condensing portion 30 are two, and the two light source structures 20 and the two light condensing portions 30 are disposed in one-to-one correspondence and are respectively located at two sides of the lens 40.
In this way, the light emitted from the light source structure 20 is collected by the light collecting portion 30, and then emitted to the original 100, the light is reflected on the surface of the original 100, the lens 40 collects the reflected light reflected by the surface of the original 100, and irradiates the reflected light onto the photosensitive chip 50, and the photosensitive chip 50 is used for analyzing the reflected light to obtain the light image of the original 100.
In an alternative embodiment shown in fig. 2, the light source structure 20 comprises a mounting plate 23 and a light emitting unit 22, the mounting plate 23 being located on one side of the lens 40 and being arranged at an angle to the lens 40, the light emitting unit 22 being arranged on the mounting plate 23. The light emitting units 22 are arranged in a linear array on a mounting plate 23.
Alternatively, the light emitting unit 22 is an LED chip, and the mounting board 23 is a PCB board.
Example III
As shown in fig. 3, the image reading apparatus provided in this embodiment can collect both reflected light rays of an original document and transmitted light rays transmitted through the original document; as shown in fig. 3, the frame 10 includes a first frame 11 and a second frame 12, the first frame 11 and the second frame 12 being disposed opposite to each other to form a rest space therebetween for placing the original 100, the light source structure 20 includes a transmissive light source structure 24 and a reflective light source structure 25, wherein the transmissive light source structure 24 is disposed in the first frame 11, the reflective light source structure 25 is disposed in the second frame 12, the image reading apparatus further includes a lens 40 and a photosensitive chip 50, and the lens 40 and the photosensitive chip 50 are disposed in the second frame 12 in this order along a propagation path of light emitted from the transmissive light source structure 24.
In this embodiment, the light image of the original document 100 can be obtained as required by controlling the operation of the transmissive light source structure 24 or the operation of the reflective light source structure 25, so that the application range of the image reading apparatus is increased, and the practicality and the use convenience of the image reading apparatus are further improved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways and the spatially relative descriptions used herein are construed accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An image reading apparatus for reading an optical image on an original (100), comprising:
a frame (10);
a light source structure (20), the light source structure (20) being provided on the frame body (10) for emitting light to the original document (100);
a light condensing portion (30), wherein the light condensing portion (30) is disposed opposite to the light source structure (20) and is located on a propagation path of light rays emitted from the light source structure (20), and the light condensing portion (30) is configured to condense light rays transmitted therethrough so as to increase the number of the light rays reaching a light image of the original document (100);
the light condensing part (30) comprises a substrate (31) and a plurality of light condensing teeth (32) arranged on the substrate (31), wherein the plurality of light condensing teeth (32) are sequentially arranged along the width direction of the substrate (31), and each light condensing tooth (32) continuously extends along the length direction of the substrate (31);
the plurality of light-gathering teeth (32) comprise a first light-gathering tooth group and a second light-gathering tooth group, and the plurality of light-gathering teeth (32) of the first light-gathering tooth group and the plurality of light-gathering teeth (32) of the second light-gathering tooth group are symmetrically arranged at two sides of the midpoint of the wide edge of the base plate (31);
the cross-section of each light-gathering tooth (32) perpendicular to the length direction is a right triangle, the width of each light-gathering tooth (32) is equal, the heights of the plurality of light-gathering teeth (32) of the first light-gathering tooth group gradually decrease along the direction towards the midpoint of the wide edge of the substrate (31), and the heights of the plurality of light-gathering teeth (32) of the second light-gathering tooth group gradually decrease along the direction towards the midpoint of the wide edge of the substrate (31);
the light condensing part (30) is used for converging light beams transmitted through the light condensing part to a light condensing point F, a first right-angle side (33) of the right-angle triangle is positioned on the upper surface (312) of the substrate (31), a second right-angle side (34) of the right-angle triangle is perpendicular to the upper surface (312) of the substrate (31), an included angle between a hypotenuse (35) of the right-angle triangle and the first right-angle side (33) is alpha, and the magnitude of the included angle alpha satisfies the following equation:
β＝90°+α-arcsin[m sin(α-arcsin(sinγ/m))] (1)；
β＝arctan(n-0.5)a/f (2)；
γ＝arctan(n-0.5)a/h (3)；
wherein,
gamma is the angle of incidence at which the light ray is refracted at the lower surface (311) of the substrate (31);
beta is the angle between the reverse extension line of the refracted ray when the ray is refracted at the hypotenuse (35) of the right triangle and the lower surface (311) of the substrate (31);
a is the length of a first right-angle side (33) of the right triangle;
n is an nth light concentrating tooth (32) of the plurality of light concentrating teeth (32) from a midpoint of the broad side of the substrate (31);
f is the distance between the first right-angle side (33) and the converging point F;
h is the distance between the light source structure (20) and the lower surface (311) of the substrate (31);
m is the refractive index of the light condensing part (30).
2. The image reading apparatus according to claim 1, wherein a lower surface (311) of the substrate (31) facing the light source structure (20) is planar, and the light converging teeth (32) are provided on an upper surface (312) of the substrate (31) facing away from the light source structure (20).
3. The image reading apparatus according to claim 1, wherein the base plate (31) and the light condensing teeth (32) are of an integral structure, and both are made of glass or transparent plastic.
4. The image reading apparatus according to claim 1, wherein the light condensing portion (30) is a convex lens or a fresnel lens.
5. The image reading apparatus according to claim 1, wherein the image reading apparatus is a transmissive image reading apparatus, the frame (10) includes a first frame (11) and a second frame (12), the first frame (11) and the second frame (12) are disposed opposite to each other to form a rest space therebetween for placing the original (100), wherein the light source structure (20) and the light condensing portion (30) are disposed within the first frame (11), the image reading apparatus further includes a lens (40) and a photosensitive chip (50), and the lens (40) and the photosensitive chip (50) are disposed within the second frame (12) in this order along a propagation path of the light.
6. The image reading apparatus according to claim 5, wherein the light source structure (20) includes:
a light guide column (21), the light guide column (21) having a light exit surface;
and the light emitting units (22) are arranged at two ends of the light guide column (21).
7. The image reading apparatus according to claim 1, wherein the image reading apparatus is a reflective image reading apparatus, the image reading apparatus further comprises a lens (40) and a photosensitive chip (50), the lens (40) and the photosensitive chip (50) are disposed in the frame (10), the light source structure (20) and the light condensing portion (30) are two, and the two light source structures (20) and the two light condensing portions (30) are disposed in one-to-one correspondence and are located on two sides of the lens (40), respectively.
8. The image reading apparatus according to claim 7, wherein the light source structure (20) includes:
the mounting plate (23) is positioned on one side of the lens (40) and is arranged at an included angle with the lens (40);
-a lighting unit (22), said lighting unit (22) being arranged on said mounting plate (23).
9. The image reading apparatus according to claim 1, wherein the frame body (10) includes a first frame body (11) and a second frame body (12), the first frame body (11) and the second frame body (12) are disposed opposite to each other to form a resting space therebetween for resting the original document (100), the light source structure (20) includes a transmissive light source structure (24) and a reflective light source structure (25), wherein the transmissive light source structure (24) is disposed within the first frame body (11), the reflective light source structure (25) is disposed within the second frame body (12), the image reading apparatus further includes a lens (40) and a photosensitive chip (50), and the lens (40) and the photosensitive chip (50) are disposed in the second frame body (12) in order along a propagation path of light emitted by the transmissive light source structure (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810241856.6A CN108429869B (en) | 2018-03-22 | 2018-03-22 | Image reading apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810241856.6A CN108429869B (en) | 2018-03-22 | 2018-03-22 | Image reading apparatus |
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| CN108429869B true CN108429869B (en) | 2024-02-06 |
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| CN1832528A (en) * | 2005-03-10 | 2006-09-13 | 株式会社理光 | Original illuminating device, image access device and image forming device |
| JP2008301353A (en) * | 2007-06-01 | 2008-12-11 | Mitsubishi Electric Corp | Document reading apparatus |
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