CN208015832U

CN208015832U - Image read-out

Info

Publication number: CN208015832U
Application number: CN201820397363.7U
Authority: CN
Inventors: 王虎岩; 于超; 王凤秀; 王家重; 曹慧俐
Original assignee: Weihai Hualing Opto Electronics Co Ltd
Current assignee: Weihai Hualing Opto Electronics Co Ltd
Priority date: 2018-03-22
Filing date: 2018-03-22
Publication date: 2018-10-26
Anticipated expiration: 2028-03-22

Abstract

The utility model provides a kind of image read-out, for reading the light image on original copy, including framework, light-source structure and light collecting part, light-source structure is arranged in framework, for emitting light to original copy, light collecting part is oppositely arranged with light-source structure, and on the propagation path for the light that light-source structure is sent out, light collecting part is used to will transmit through its light beam convergence, to increase the quantity of the light at the light image for reaching original copy.The utilization rate that the utility model solves the light that image read-out in the prior art sends out its light-source structure is relatively low, to not only cause the waste of the energy, but also the problem of reduce the reading accuracy of light image of the image read-out to original copy.

Description

Image reading apparatus

Technical Field

The utility model relates to an image sensor technical field particularly, relates to an image reading device.

Background

In a conventional image reading apparatus, a light source structure is generally used to emit light to an original, the light emitted from the light source structure is transmitted through the original or reflected on the surface of the original after reaching 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.

The image reading device reads an optical image of an original in a reading area, when light emitted by a 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 the outside of the reading area, and the part of the light positioned outside the reading area cannot be utilized by the image reading device, so that energy waste is caused. When the light intensity of the light source structure is constant, the smaller the number of light rays in the reading area, the lower the brightness in the reading area, which easily causes the light image of the original document obtained by the image reading device to be too dark, and reduces the accuracy of reading the light image of the original document by the image reading device.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an image reading apparatus, in order to solve the problem that the image reading apparatus in the prior art is low in the utilization rate of the light emitted from the light source structure, thereby not only causing the waste of energy, but also reducing the problem of the reading accuracy of the light image of the original document.

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 body; the light source structure is arranged on the frame body and used for emitting light to the original manuscript; the light condensing part is arranged opposite to the light source structure and is positioned on a propagation path of light emitted by the light source structure, and the light condensing part is used for condensing light beams penetrating through the light condensing part so as to increase the quantity of the light rays reaching the light image of the original.

Further, the light-gathering part comprises a substrate and a plurality of light-gathering teeth arranged on the substrate, the light-gathering teeth are sequentially arranged along the width direction of the substrate, and each light-gathering 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-gathering teeth are arranged on the upper surface of the substrate facing away from the light source structure.

Further, the plurality of light-gathering teeth comprise a first light-gathering tooth group and a second light-gathering tooth group, and the plurality of light-gathering teeth of the first light-gathering tooth group and the plurality of light-gathering teeth of the second light-gathering tooth group are symmetrically arranged on two sides of the midpoint of the wide side of the substrate.

Furthermore, the cross-sectional shape of the light-gathering teeth perpendicular to the length direction is a right triangle, the widths of the light-gathering teeth are equal, the heights of the light-gathering teeth of the first light-gathering tooth group are gradually reduced along the direction towards the midpoint of the broad side of the substrate, and the heights of the light-gathering teeth of the second light-gathering tooth group are gradually reduced along the direction towards the midpoint of the broad side of the substrate.

further, the light-gathering portion is used for gathering the light beam that sees through it to spotlight point F, and right triangle's first right-angle side is located the upper surface of base plate, and right triangle's second right-angle side perpendicular to the upper surface of base plate, and the contained angle on right triangle's hypotenuse and first right-angle side is α, and the size of contained angle α satisfies the following equation set:

β＝90°+α-arc sin[m sin(α-arc sin(sinγ/m))](1)；

β＝arc tan(n-0.5)a/f (2)；

γ＝arc tan(n-0.5)a/h (3)；

wherein gamma is an incident angle of light rays when the light rays are refracted at the lower surface of the substrate, β is an included angle between a reverse extension line of the refracted light rays when the light rays are refracted at the bevel edge of the right triangle and the lower surface of the substrate, a is the length of the first right-angle side of the right triangle, n is the nth light-gathering tooth which is in the plurality of light-gathering teeth and is away from the middle point of the wide side of the substrate, F is the distance between the first right-angle side and a light-gathering point F, h is the distance from the light source structure to the lower surface of the substrate, and m is the refractive index of the light-gathering part.

Further, the substrate and the light-gathering teeth are of an integral structure, and the substrate and the light-gathering teeth are made of glass or transparent plastics.

Further, the light-condensing portion is a convex lens or a fresnel lens.

Further, the image reading apparatus is a transmission type image reading apparatus, the frame includes a first frame and a second frame, the first frame and the second frame are disposed oppositely to form a holding space for holding the original, wherein the light source structure and the light-gathering portion are disposed in the first frame, the image reading apparatus further includes a lens and a photosensitive chip, and the lens and the photosensitive chip are sequentially disposed in the second frame 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.

Furthermore, the image reading device is a reflection type 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 number of the light source structures and the number of the light-gathering parts are two, and the two light source structures and the two light-gathering parts are arranged in a one-to-one correspondence mode and are respectively located on two sides of the lens.

Further, the light source structure includes: the mounting plate is positioned on one side of the lens and forms 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 arranged oppositely to form a holding space for holding the original, the light source structure comprises a transmission light source structure and a reflection light source structure, 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 propagation path of light rays emitted by the transmission light source structure.

Use the technical scheme of the utility model, through set up the spotlight portion on the propagation path of the light that sends at the light source structure, the light that makes the light source structure send sees through the spotlight portion earlier, the spotlight portion makes the light beam that sees through it assemble, the light beam is to original manuscript transmission after assembling again, thereby under the certain circumstances of light intensity that the light source structure provided, the quantity of the light that reachs image reading device's reading region department has been increased, the light intensity in the reading region has been promoted, thereby be favorable to being located the light pattern of the original manuscript in the reading region and illuminated, make image reading device can obtain the light pattern of clear original manuscript, the reading accuracy to the light pattern of original manuscript of image reading device has been promoted, image reading device's operational reliability has been improved.

Drawings

The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of an image reading apparatus according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of an image reading apparatus according to a second embodiment of the present invention;

fig. 3 is a schematic structural view of an image reading apparatus according to a third embodiment of the present invention;

fig. 4 is a front view showing an alternative embodiment of a light condensing portion of the image reading apparatus of the present invention;

FIG. 5 shows a top view of the light gathering portion of FIG. 4;

fig. 6 is a schematic diagram illustrating the operation of the light-condensing portion of fig. 4;

FIG. 7 shows an enlarged schematic view at A in FIG. 6;

FIG. 8 is a view showing a simulation of light intensity distribution of an image reading apparatus in the related art;

fig. 9 is a graph showing a simulation of the light intensity distribution of the image reading apparatus of the present application with the light condensing portion.

Wherein the figures include the following reference numerals:

100. an original document; 10. a frame body; 11. a first frame body; 12. a second frame body; 20. a light source structure; 21. a light guide pillar; 22. a light emitting unit; 23. mounting a plate; 24. a transmissive light source structure; 25. a reflective light source structure; 30. a light-condensing section; 31. a substrate; 311. a lower surface; 312. an upper surface; 32. a light gathering tooth; 33. a first right-angle side; 34. a second right-angle side; 35. a bevel edge; 40. a lens; 50. a photosensitive chip; 60. a reflection pattern; 70. a control circuit board; 80. and an external power supply structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In order to solve the image reading device among the prior art and lower to the utilization ratio of the light that its light source structure sent to not only cause the waste of the energy, reduced the problem of image reading device to the reading accuracy of the light image of original manuscript moreover, the utility model provides an image reading device.

As shown in fig. 1 to 3, the present application provides an image reading apparatus for reading an optical image on an original 100, including a housing 10, a light source structure 20, and a light condensing portion 30, the light source structure 20 being disposed on the housing 10 for emitting light toward the original 100, the light condensing portion 30 being disposed opposite to the light source structure 20 and being located on a propagation path of the light emitted from the light source structure 20, the light condensing portion 30 being configured to condense light beams transmitted therethrough to increase the amount of light reaching the optical image of the original 100.

In the present application, the light-condensing portion 30 is disposed on the propagation path of the light emitted from the light source structure 20, so that the light emitted from the light source structure 20 firstly passes through the light-condensing portion 30, the light-condensing portion 30 converges the light beams passing through the light-condensing portion, and the light beams are emitted to the original document 100 after converging, thereby increasing the number of light reaching the reading area of the image reading apparatus under the condition that the light intensity provided by the light source structure 20 is constant, increasing the light intensity in the reading area, facilitating the illumination of the light image of the original document 100 located in the reading area, enabling the image reading apparatus to obtain a clear light image of the original document 100, increasing the reading accuracy of the light image of the original document 100 by the image reading apparatus, and improving the working reliability of the image reading apparatus.

Fig. 4 and 5 show an alternative embodiment of the light-condensing portion 30, and specifically, the light-condensing portion 30 includes a substrate 31 and a plurality of light-condensing teeth 32 disposed on the substrate 31, the plurality of light-condensing teeth 32 being sequentially disposed along a width direction of the substrate 31, and each light-condensing tooth 32 continuously extending along a length direction of the substrate 31. Like this, the light that light source structure 20 sent takes place refraction for the first time when penetrating base plate 31 from the air, takes place refraction for the second time when penetrating the air from spotlight tooth 32 to change the emission angle of light, realize the effect of assembling to light, make more light reach and read the region, utilized by image reading device, promote the utilization ratio of image reading device to the light that light source structure sent.

As shown in fig. 4 and 5, a lower surface 311 of the substrate 31 facing the light source structure 20 is a plane, and the light-gathering teeth 32 are disposed on an upper surface 312 of the substrate 31 facing away from the light source structure 20. Thus, when the light emitted from 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 between the light-gathering teeth 32 and the air, so that the light beams are converged by utilizing the two refractions of the light.

As shown in fig. 4 and 5, the plurality of light collecting teeth 32 include a first light collecting tooth group and a second light collecting tooth group, and the plurality of light collecting teeth 32 of the first light collecting tooth group and the plurality of light collecting teeth 32 of the second light collecting tooth group are symmetrically disposed at both sides of a midpoint of the wide side of the substrate 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 widths of the light collecting teeth 32 are all equal, the heights of the plurality of light collecting teeth 32 of the first light collecting tooth group are gradually reduced in a direction toward the midpoint of the broad side of the substrate 31, and the heights of the plurality of light collecting teeth 32 of the second light collecting tooth group are gradually reduced in a direction toward the midpoint of the broad side of the substrate 31. By reasonably optimizing the heights of the plurality of light-gathering teeth 32 and arranging the light-gathering teeth 32 with different heights, the light-gathering portion 30 is reliably made to gather the light beams transmitted therethrough, and specifically, in the present embodiment, as shown in fig. 6, the light beams transmitted through the light-gathering portion 30 are gathered to the light-gathering point F.

Fig. 6 and 7 show the operation principle of the light-condensing unit 30, wherein the light source structure 20 has a light-emitting point O, the light-condensing point F is a converging point of the light beam that ideally passes through the light-condensing unit 30, and the light beam emitted from the light source structure 20 passes through the light-condensing unit 30, is refracted twice, and then is irradiated to the light-condensing point F.

as shown in fig. 6 and 7, the light-collecting portion 30 is configured to collect the light beam transmitted through it to a light-collecting point F, a first right-angle side 33 of the right-angle triangle is located 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 α is formed between the hypotenuse 35 of the right-angle triangle and the first right-angle side 33, 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)；

wherein γ is an incident angle of the light when refracted at the lower surface 311 of the substrate 31, β is an angle between a reverse extension line of the refracted light when refracted at the hypotenuse 35 of the right triangle and the lower surface 311 of the substrate 31, a is a length of the first right-angle side 33 of the right triangle, n is the nth light-focusing tooth 32 from a midpoint of the broad side of the substrate 31 among the plurality of light-focusing teeth 32, F is a distance between the first right-angle side 33 and a light-focusing point F, h is a distance from the light source structure 20 to the lower surface 311 of the substrate 31, and m is a refractive index of the light-focusing portion 30.

It should be noted that the above formula is calculated by taking the midpoint of the hypotenuse of the triangle as an example, and theoretically, the light rays refracted at other positions of the hypotenuse cannot be irradiated to the light converging point F, but within the range allowed by the optical field, the number of light rays reaching the reading area of the image reading apparatus can be effectively increased by utilizing the light converging effect of the light converging portion 30 of the image reading apparatus of the present application. It should be added that small deviations between the refracted rays at other positions of the hypotenuse and the convergence point F do not affect the utility of the present application.

for convenience of calculation and processing, the lengths of the first right-angle sides 33 of all the light-gathering teeth 32 are the same, that is, the lengths of the first right-angle sides 33 are all a, so that 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-angle triangle and the first right-angle side 33 to be α, that is, the direction of the light after the light passes through the light-gathering portion 30 and is refracted twice is controlled, and the light beam is gathered to the light-gathering point F.

Optionally, the value range of a is greater than or equal to 0.1mm and less than or equal to 1 mm; the higher the required convergence accuracy, the smaller the value of a.

In consideration of the economic cost and the light condensing effect of processing the light condensing portion 30, the value of a can be selected to be a large value within the above value range in practical use.

Optionally, a distance h between the light source structure 20 and the lower surface 311 of the substrate 31 ranges from greater than 0mm to less than or equal to 10 mm.

As shown in fig. 6, L is a distance between the light emitting point O and the surface of the original 100 close to the light source structure 20. On the premise that the distance between the light emitting point O and the condensing portion 30 is kept constant, the size of the area of the reading region of the image reading apparatus is related to the distance between the reference plane on which the original 100 is placed and the condensing portion 30, and the larger the distance between the reference plane on which the original 100 is placed and the condensing portion 30 is, the smaller the area of the reading region of the image reading apparatus is, and the smaller the distance between the reference plane on which the original 100 is placed and the condensing portion 30 is, the larger the area of the reading region 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 simulation diagram of light intensity distribution of an image reading apparatus in the related art, fig. 9 is a simulation diagram of light intensity distribution of an image reading apparatus of the present application with a condensing portion, in fig. 8, the abscissa of the light intensity distribution simulation diagram means the angle between the light emitted from the light source structure 20 and the axis of the light source structure 20, in fig. 9, the abscissa of the light intensity distribution simulation diagram means an angle between the light emitted from the light source structure 20 after being converged by the light converging portion 30 and the axis of the light source structure 20, the meaning of the ordinate of the light intensity distribution simulation diagrams in fig. 8 and 9 is the light flux per unit area within the reading area of the image reading apparatus, as can be seen from comparison between fig. 8 and 9, the distribution range of the condensed light beams is narrowed, but the luminous flux per unit area is increased, and as shown in fig. 8, the maximum luminous flux per unit area is 0.88W/m.²In one embodiment of the present application, the maximum luminous flux per unit area is 21.8W/m, as shown in FIG. 9²The 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 not using the light-condensing portion 30.

Therefore, on the premise that the brightness of the reading area of the image reading device needs to be ensured to be constant, the number of the LED chips in the light source structure can be reduced, and the overall processing and manufacturing cost of the image reading device is reduced. As such, with the image reading apparatus of the present application, the brightness in the reading area is effectively enhanced, so that, in the design of the image reading apparatus, in order to ensure that the brightness in the reading area of the image reading apparatus remains at the original brightness, 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, thereby enabling the image reading apparatus to read a larger-sized light image on the original 100.

Optionally, the substrate 31 and the light-gathering teeth 32 are of an integral structure, which facilitates the processing and manufacturing of the light-gathering portion 30, and both are made of glass or transparent plastic, and the light-gathering effect of the light beams is achieved by utilizing the characteristics of the glass or transparent plastic that the light-transmittance property and the refractive index are greater than those of air.

In the embodiment not shown in the present application, the light condensing portion 30 is a convex lens or a fresnel lens. The convex lens or the Fresnel lens can also be used for converging the light beams.

The embodiment of the light collecting unit 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 a compact image reading apparatus.

A detailed description will be given below of specific embodiments of image reading apparatuses of different configurations to which the light condensing unit 30 is attached.

Example one

As shown in fig. 1, the image reading apparatus in the present embodiment is a transmission type 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 oppositely to form a placing space for placing the original 100 therebetween, wherein the light source structure 20 and the 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 focused by the light focusing portion 30 and emitted toward the original 100, a part of the light passes through the original 100, the lens 40 collects the transmitted light passing through the original 100 and irradiates the transmitted light on the photosensitive chip 50, and the photosensitive chip 50 is used for analyzing the transmitted light to obtain the light image of the original 100.

It should be noted that the parking space according to the present application is for placing the original 100, the reading area is located in the parking space, and only a part of the light beam emitted from the light source structure 20 located in the reading area 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 is continuously moved from left to right or from right to left in the resting space, the image reading apparatus reads the optical image of the original 100 in the reading area, that is, after the lens 40 collects the transmitted light passing through the original 100, the transmitted light is irradiated on the photosensitive chip 50, the photosensitive chip 50 can obtain continuous optical signals and convert the optical signals into electrical signals, and then the electrical signals are analyzed and processed by software to obtain the optical image of the original 100.

The image reading apparatus provided in this embodiment has a large brightness in the reading area, and can compensate for the loss of light in the propagation process, so that when the distance D between the first frame 11 and the second frame 12 is large, the image reading apparatus can still ensure the reading accuracy of the optical image of the original.

In the alternative embodiment shown in fig. 1, the light source structure 20 includes a light guiding column 21 and a light emitting unit 22, the light guiding column 21 has a light emitting surface, and the light emitting unit 22 is disposed at two ends of the light guiding column 21. The light emitted from the light emitting unit 22 enters the light guide 21 and is uniformly emitted from the light exit surface of the light guide 21 toward the original 100.

Alternatively, the light emitted by the light emitting unit 22 may be a single color, 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 21 may be various, such as rectangular, diamond, circular, etc. In an alternative embodiment shown in FIG. 1 of the present application, the cross-sectional shape of the light guide 21 is circular.

Optionally, the image reading apparatus further includes a reflection pattern 60, the reflection pattern 60 is disposed on a side of the light guide bar 21 away from the light condensing portion 30, and the light emitted by the light emitting unit 22 is reflected by the reflection pattern 60 and emitted from the light emitting surface of the light guide bar 21 toward the original 100.

Optionally, the image reading apparatus further includes a control circuit board 70 and an external power structure 80, the control circuit board 70 is connected to the light emitting unit 22, the external power 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, the lens 40 and the photosensitive chip 50 are disposed in the frame 10, two light source structures 20 and two light-collecting portions 30 are both disposed in one-to-one correspondence, and the two light source structures 20 and the two light-collecting portions 30 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 emitted toward the original 100, the light is reflected on the surface of the original 100, the lens 40 collects the reflected light transmitted through the surface of the original 100 and irradiates the reflected light on 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 includes a mounting plate 23 and a light emitting unit 22, the mounting plate 23 is disposed on one side of the lens 40 and forms an angle with the lens 40, and the light emitting unit 22 is disposed on the mounting plate 23. The light emitting units 22 are arranged in a linear array on the mounting board 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 according to the present embodiment can collect both reflected light rays of an original and transmitted light rays transmitted through the original; 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 are disposed opposite to each other to form a placement space for placing the original 100 therebetween, 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 sequentially disposed in the second frame 12 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 transmission light source structure 24 or the operation of the reflection light source structure 25, so that the application range of the image reading apparatus is widened, and the practicability and the convenience of use 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 according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

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 according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An image reading apparatus for reading an optical image on an original (100), comprising:

a frame body (10);

a light source structure (20), the light source structure (20) being provided on the frame body (10) and emitting light to the original (100);

the light-condensing portion (30) is arranged opposite to the light source structure (20) and located on a propagation path of light emitted by the light source structure (20), and the light-condensing portion (30) is used for condensing light beams penetrating through the light-condensing portion so as to increase the number of the light reaching the light image of the original (100).

2. The image reading apparatus according to claim 1, wherein the light-condensing portion (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 sequentially provided in a width direction of the base plate (31), each of the light-condensing teeth (32) continuously extending in a length direction of the base plate (31).

3. The image reading apparatus according to claim 2, wherein a lower surface (311) of the substrate (31) facing the light source structure (20) is a plane, and the light-focusing teeth (32) are disposed on an upper surface (312) of the substrate (31) facing away from the light source structure (20).

4. The image reading apparatus according to claim 2, wherein the plurality of light-gathering teeth (32) include 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 disposed on both sides of a midpoint of the broad side of the substrate (31).

5. The image reading apparatus according to claim 4, wherein the cross-sectional shape of the light-collecting teeth (32) perpendicular to the longitudinal direction thereof is a right triangle, and the widths of the light-collecting teeth (32) are all equal, the heights of the light-collecting teeth (32) of the first light-collecting tooth group are gradually reduced in a direction toward the midpoint of the broad side of the substrate (31), and the heights of the light-collecting teeth (32) of the second light-collecting tooth group are gradually reduced in a direction toward the midpoint of the broad side of the substrate (31).

6. the image reading apparatus according to claim 5, wherein the light-condensing portion (30) is configured to condense the light beam transmitted therethrough to a light-condensing point F, a first leg (33) of the right triangle is located on the upper surface (312) of the substrate (31), a second leg (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 leg (33) is defined, and a magnitude of the included angle α satisfies the following equation set:

β＝90°+α-arc sin[m sin(α-arc sin(sinγ/m))](1)；

β＝arc tan(n-0.5)a/f (2)；

γ＝arc tan(n-0.5)a/h (3)；

wherein,

γ is the angle of incidence at which the light rays are refracted at the lower surface (311) of the substrate (31);

beta is an included angle between a reverse extension line of the refracted ray and the lower surface (311) of the substrate (31) when the ray is refracted at the hypotenuse (35) of the right triangle;

a is the length of a first right-angle side (33) of the right-angle triangle;

n is the nth light-gathering tooth (32) which is separated from the middle point of the wide side of the substrate (31) in the plurality of light-gathering teeth (32);

f is the distance between the first right-angle edge (33) and the light-gathering point F;

h is the distance between the light source structure (20) and the lower surface (311) of the substrate (31);

m is a refractive index of the light-condensing portion (30).

7. The image reading apparatus according to claim 2, wherein the substrate (31) and the light-gathering teeth (32) are of a unitary structure and both are made of glass or transparent plastic.

8. The image reading apparatus according to claim 1, wherein the light-condensing portion (30) is a convex lens or a fresnel lens.

9. The image reading apparatus according to claim 1, wherein the image reading apparatus is a transmission type image reading apparatus, 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 oppositely to form a rest space for resting the original (100) therebetween, wherein the light source structure (20) and the light condensing portion (30) are disposed in the first frame body (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 body (12) in this order along a propagation path of the light.

10. The image reading apparatus according to claim 9, wherein the light source structure (20) includes:

the light guide column (21), the light guide column (21) has a light-emitting surface;

and the light emitting units (22), wherein the light emitting units (22) are arranged at two ends of the light guide column (21).

11. The image reading apparatus according to claim 1, wherein the image reading apparatus is a reflective image reading apparatus, the image reading apparatus further includes a lens (40) and a photosensitive chip (50), the lens (40) and the photosensitive chip (50) are disposed in the frame (10), the number of the light source structures (20) and the number of the light-condensing portions (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 on two sides of the lens (40).

12. The image reading apparatus according to claim 11, wherein the light source structure (20) includes:

the mounting plate (23) is positioned on one side of the lens (40) and forms an included angle with the lens (40);

a light emitting unit (22), the light emitting unit (22) being disposed on the mounting plate (23).

13. The image reading apparatus according to claim 1, wherein the housing (10) includes a first housing (11) and a second housing (12), the first housing (11) and the second housing (12) being disposed opposite to each other, to form a rest space therebetween for resting the original (100), the light source structure (20) comprising a transmissive light source structure (24) and a reflective light source structure (25), wherein a transmissive light source structure (24) is arranged within the first frame body (11), the reflection light source structure (25) is arranged in the second frame body (12), the image reading device further comprises a lens (40) and a photosensitive chip (50), the lens (40) and the photosensitive chip (50) are sequentially arranged in the second frame body (12) along the propagation path of the light rays emitted by the transmission light source structure (24).