CN105376451A - Linear light source, image sensor and image scanning device - Google Patents
Linear light source, image sensor and image scanning device Download PDFInfo
- Publication number
- CN105376451A CN105376451A CN201510742736.0A CN201510742736A CN105376451A CN 105376451 A CN105376451 A CN 105376451A CN 201510742736 A CN201510742736 A CN 201510742736A CN 105376451 A CN105376451 A CN 105376451A
- Authority
- CN
- China
- Prior art keywords
- light
- light source
- image sensor
- led
- reflecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 239000011521 glass Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000004020 conductor Substances 0.000 abstract 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000005855 radiation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
-
- 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
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
- H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
-
- 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
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
- H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
- H04N1/0315—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors using photodetectors and illumination means mounted on separate supports or substrates or mounted in different planes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
The invention provides a linear light source, an image sensor and an image scanning device. The linear light source comprises an LED spot light source installed on an LED-PCB; an optical conductor connected to an LED coupling end casing, wherein the LED spot light source and the optical conductor are oppositely arranged through the LED coupling end casing, the optical conductor is provided with a first side and a second side which are oppositely arranged, a bottom side and a light emitting side which are arranged oppositely, and reflecting sides arranged between the bottom side and the light emitting side, and the light from the LED spot light source is emitted to the second side from the first side; and a reflective graph arranged on the bottom side, wherein partial or all outline type lines of the reflecting sides are parabolas, and the bottom side passes through the focal points of the parabolas. The linear light source utilizes the principle that the light passing through the focal point of a parabola is bound to be reflected parallelly after reflection of the parabola to solve the problem of low light source utilization efficiency caused by oversized radiation angles of a liner light source in the prior art.
Description
Technical Field
The invention relates to the field of photoelectric scanning, in particular to a line light source, an image sensor and image scanning equipment.
Background
An image sensor, particularly a contact image sensor, includes a light guide type line light source. The light emitted from the LED light emitting body of the linear light source enters the light guide body from the end surface of the light guide body and exits from the exit portion on the side surface of the light guide body, and the light exiting from the light guide body becomes linear light extending in the main scanning direction of the document surface. The contact image sensor is mainly used in facsimile machine, and its scanning mode is contact scanning mode, and is characterized by that it uses glue roller to press original manuscript, makes the original manuscript pass through the bearing surface of the image sensor, and the linear light is shone on the surface of the original manuscript, then makes scanning operation. With the expansion of the application range of the contact image sensor, for example, the contact image sensor is applied to the fields of currency counting and detecting machines, paper reading machines and the like, the sensors in the fields require thousands of scans per minute, and the original paper is fed at high speed. Since the contact scanning method causes a paper jam, many image sensors requiring high-speed paper feeding must use a floating type scanning method. A typical paper path of the floating scanning system requires 2mm, and for some image sensors for special applications, the paper path needs to be wider (i.e., greater than 2mm) and the original document floats in the paper path, and for this reason, the image sensor needs to be able to ensure uniformity of light output intensity at each distance in the range of the paper path.
The linear light sources used by the image sensor of the existing contact scanning mode have over concentrated principal rays, and the output intensity of light at each distance is different, so that the linear light sources cannot be directly applied to the image sensor of the floating scanning mode. In this regard, in order to ensure that the output intensity of light of the original at each distance in the range of the paper path is the same, the principal ray of the line light source is generally designed to have a large divergence angle, which is generally over 60 °, and then the improved line light source is applied to the image sensor of the floating scanning type. However, an excessively large divergence angle may cause inefficient light source utilization.
Disclosure of Invention
The invention mainly aims to provide a line light source, an image sensor and an image scanning device, so as to solve the problem of low utilization efficiency of the light source caused by an excessively large divergence angle of the line light source in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a line light source including: the LED point light source is carried on the LED-PCB; the LED point light source is positioned on the end part of the first side surface of the light guide body, and light emitted by the LED point light source is emitted to the second side surface from the first side surface; the light-reflecting pattern is arranged on the bottom side surface; wherein, the part or all of the contour line of the reflecting side surface is a parabola, and the bottom side surface passes through the focus of the parabola.
Furthermore, the light guide body is provided with two reflecting side surfaces which are oppositely arranged, and the two reflecting side surfaces are parabolic molded surfaces; or the two reflecting side surfaces are both formed by smoothly connecting parabolic molded surfaces and total reflection planes; or one of the reflecting side surfaces is a parabolic profile, and the other reflecting side surface is formed by smoothly connecting the parabolic profile and the total reflection plane; or one of the reflecting side surfaces is a parabolic profile, and the other reflecting side surface is formed by smoothly connecting the parabolic profile and the total reflection curved surface.
Further, the light-emitting side surface is a plane.
Furthermore, the light-emitting side surface is a convex surface, and the convex surface protrudes along the direction far away from the bottom side surface.
Furthermore, the light-emitting side surface is a concave surface, and the concave surface protrudes towards the bottom side surface.
Furthermore, the part of the light-emitting side surface is a plane, the other part of the light-emitting side surface is a concave surface, and the concave surface protrudes towards the bottom side surface.
Furthermore, the light-emitting side surface is a plane, the other part of the light-emitting side surface is a convex surface, and the convex surface protrudes along the direction far away from the bottom side surface.
According to another aspect of the present invention, there is provided an image sensor including the aforementioned line light source.
Further, the image sensor further includes: the mounting frame is provided with a light source mounting space and a lens mounting space which are arranged at intervals, and the linear light source is mounted in the light source mounting space; the transmission glass plate is covered on the upper opening end of the mounting frame and used for bearing the original manuscript; a lenticular lens installed in the lens installation space, the lenticular lens receiving reflected light reflected from the original; and the photoelectric conversion structure is arranged at the bottom of the mounting frame, receives the light transmitted by the cylindrical lens and converts the optical signal into an electric signal to be output.
Further, the photoelectric conversion structure includes: the photoelectric signal conversion circuit board is arranged on the frame; and the photoelectric conversion chip is arranged on the photoelectric signal conversion circuit board and is opposite to the columnar lens.
According to still another aspect of the present invention, there is provided an image scanning apparatus including the image sensor described above, wherein the image scanning apparatus further includes a document feeding mechanism disposed above the mounting frame of the image sensor, and a document feeding path is formed between the document feeding mechanism and the transmission glass plate of the image sensor, and light emitted from the line light source of the image sensor is irradiated onto an original document passing through the document feeding path.
Further, the longitudinal width of the document feeding channel is D, and D is set in the range of 2mm to 3 mm.
According to the technical scheme, the line light source comprises an LED point light source, an LED-PCB, an LED connecting end shell, a light guide body and a light reflecting graph, wherein the light guide body is provided with a first side face and a second side face which are oppositely arranged, a bottom side face and a light emitting side face which are oppositely arranged, and a reflecting side face arranged between the bottom side face and the light emitting side face, light of the LED point light source irradiates to the second side face from the first side face, the light irradiates on the light reflecting graph, the light is reflected to the reflecting side face by the light reflecting graph and then is reflected to the light emitting side face by the reflecting side face, the outline profile line of the reflecting side face is a parabola, and the plane of the bottom side face is perpendicular to the symmetry axis of. The light emitted by the line light source LED point light source is totally reflected from the reflecting side surface, so that the loss of light refraction is avoided, the utilization efficiency of the light is improved, the light emitted by the LED point light source can be reflected by the reflecting side surface to form light which is emitted approximately in parallel, when the light irradiates the range of a preset channel, the divergence angle of the light emission is small, the efficient directional light-emitting effect is achieved, the loss outside a manuscript walking channel is avoided, and the utilization efficiency of the light is further improved; then the light is irradiated after being refracted by the light-emitting side surface, the light emitted from the luminous body is uniform in light intensity in a preset range through the convergence or the divergence of the light emitted by the light-emitting side surface, so that a light source with average light intensity irradiation can be obtained, the light emitted by the linear light source is small in change, and the effect of nearly the same brightness on the irradiated object can be obtained.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, 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 view showing an assembly structure of a first embodiment of a linear light source according to the present invention;
FIG. 2 shows an exploded view of the line light source of FIG. 1;
FIG. 3 is a schematic diagram showing a light exit structure of the first embodiment of the line light source of FIG. 1;
fig. 4 shows a schematic configuration diagram of a first embodiment of the image sensor of the present invention;
FIG. 5 is a schematic diagram of a light emitting structure of a second embodiment of the line light source of the present invention;
fig. 6 shows a schematic configuration diagram of a second embodiment of the image sensor of the present invention;
FIG. 7 is a schematic diagram showing a light emitting structure of a third embodiment of the line light source of the present invention;
fig. 8 shows a schematic configuration diagram of a third embodiment of the image sensor of the present invention;
FIG. 9 is a schematic structural diagram of a fourth embodiment of the line light source of the present invention;
fig. 10 shows a schematic configuration diagram of a fourth embodiment of the image sensor of the present invention;
FIG. 11 is a schematic diagram showing the effect of the output intensity of light emitted from the first embodiment of the linear light source of the present invention at different distances in the document feeding path;
FIG. 12 is a schematic diagram showing the effect of the output intensity of light emitted from the second embodiment of the linear light source of the present invention at different distances in the document path;
FIG. 13 is a schematic diagram showing the effect of the output intensity of light emitted from the third embodiment of the linear light source of the present invention at different distances in the document path;
fig. 14 is a schematic diagram showing the effect of the light emitted from the fourth embodiment of the linear light source of the present invention on the output intensity of the light at different distances in the document path.
Wherein the figures include the following reference numerals:
10. an LED point light source; 11. an LED-PCB board;
12. an LED connection end housing; 20. a light guide;
21. a first side surface; 22. a second side surface;
23. a bottom side surface; 24. a light exit side surface;
25. a reflective side surface; 30. a light-reflecting pattern;
40. a mounting frame; 41. a light source installation space;
42. a lens mounting space; 50. a transmissive glass plate;
60. a manuscript feeding mechanism; 70. a lenticular lens;
80. a photoelectric conversion structure; 81. a photoelectric signal conversion circuit board;
82. a photoelectric conversion chip.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The paths with arrows in fig. 1, 3, 5, 7, and 9 are irradiation paths of light.
As shown in fig. 1 to 3, 5, 7 and 9, the present invention provides a line light source. As shown in fig. 1 to 3, it shows a schematic structural diagram of a first embodiment of the line light source of the present invention. The line light source comprises an LED point light source 10, an LED-PCB board 11, an LED connecting end shell 12, a light guide body 20 and a reflective graph 30, wherein the light guide body 20 is provided with a first side surface 21 and a second side surface 22 which are oppositely arranged, a bottom side surface 23 and a light-emitting side surface 24 which are oppositely arranged, and a reflective side surface 25 which is arranged between the bottom side surface 23 and the light-emitting side surface 24, the LED point light source 10 is positioned on the end part of the first side surface 21, specifically, the LED point light source 10 is carried on the LED-PCB board 11, and the light guide body 20 is connected with the LED connecting end shell 12 (when the light guide body 20, the LED connecting end shell 12, the LED point light source 10 and the LED-PCB board 11 are assembled and connected, firstly, the LED point light source 10 is bonded and is electrically connected on the LED-PCB board 11 by gold wires or silver wires (the gold wires have the advantages of oxidation resistance and good tension), then the LED connecting end shell, and then the light guide body 20 is connected with the LED connection end housing 12), and the LED point light source 10 is connected with the light guide body 20 through the LED connection end housing 12, the light emitted by the LED point light source 10 is emitted from the first side surface 21 to the second side surface 22, and the light reflection pattern 30 is disposed on the bottom side surface 23, wherein a part or all of the contour line of the reflection side surface 25 is a parabola, the bottom side surface 23 passes through the focus of the parabola, and the bottom side surface 23 is a plane (when the parabola is a parabola which completes a continuous parabola, the plane of the bottom side surface 23 is perpendicular to the symmetry axis of the parabola which passes through the focus).
The linear light source of the present invention can irradiate light emitted from the LED linear light source onto the reflective pattern located at the focal point of the parabola, and the light reflected by the reflective pattern is reflected to the reflective side, at which time the incident angle of the light reflected from the reflective pattern onto the reflective side is greater than the critical angle of total reflection (e.g., angle α shown in fig. 5)1And corner α2Both incident angles greater than the critical angle for total reflection). Therefore, the light is totally reflected from the reflecting side surface, so that the loss of light refraction is avoided, and the utilization efficiency of the light is improved.
As shown in fig. 3, in the first embodiment, the number of the reflecting side surfaces 25 is two oppositely disposed (i.e., both of the opposite side surfaces disposed between the bottom side surface 23 and the light exit side surface 24 are the reflecting side surfaces 25), specifically, both of the reflecting side surfaces 25 are parabolic profiles, and the two parabolic profiles are symmetrically disposed about a predetermined plane (the predetermined plane passes through the focal point of the parabola). Alternatively, in the first embodiment, the profile where both the two reflective side surfaces 25 are parabolic is formed by smoothly connecting the total reflection plane, or the profile where both the two reflective side surfaces 25 are parabolic is formed by smoothly connecting the total reflection curved surface (the curvature of each total reflection curved surface is different from the curvature of each total reflection curved surface of the parabolic profile) with the total reflection curved surface (when the light is reflected to the total reflection plane or the total reflection curved surface by the reflective pattern 30, the light is reflected again by the total reflection plane or the total reflection curved surface, so that the light is slightly converged toward the exit center, so as to enhance the light intensity at the exit center). Alternatively, in the first embodiment, one of the two reflecting side surfaces 25 of the light guide 20 is a parabolic profile, and the other reflecting side surface 25 is a reflecting side surface formed by smoothly connecting the parabolic profile with the total reflection plane. Alternatively, in the first embodiment, one of the two reflective side surfaces 25 of the light guide 20 is a parabolic profile, and the other reflective side surface 25 is a reflective side surface formed by smoothly connecting the parabolic profile and the total reflection curved surface.
Specifically, the light exit side surface 24 of the first embodiment is planar. At this time, the light refracted by the light-emitting side surface 24 forms parallel or approximately parallel light (in other embodiments, when the irradiated light needs to form convergent light, the light-emitting side surface 24 may be a convex surface, and the convex surface protrudes in a direction away from the bottom side surface 23, and when the irradiated light needs to form divergent light, the light-emitting side surface 24 is a concave surface, and the concave surface protrudes toward the bottom side surface 23).
As shown in fig. 5, it shows a schematic structural diagram of a second embodiment of the line light source of the present invention. Compared with the first embodiment, the two reflecting side surfaces 25 are both reflecting side surfaces formed by smoothly connecting parabolic profiles and total reflection planes. Except for the above-described differences, the structure of the second embodiment is the same as that of the first embodiment. In the second embodiment, the two sections of total reflection surfaces close to the light-emitting side surface 24 converge the passing light, so that the light can be converged in different degrees, the upper part has a large convergence degree, and the lower part has a small convergence degree, so that the emitted light intensity is uniform within the irradiation range of the light-emitting side surface 24, the variation rate of the light intensity is small, and the stability of the irradiated light is good. As shown in fig. 7, it shows a schematic structural diagram of a third embodiment of the line light source of the present invention. Compared to the first embodiment, a part of the light exit side surface 24 is convex and another part is flat, the convex surface protruding in a direction away from the bottom side surface 23. Except for the above-described differences, the structure of the third embodiment is the same as that of the first embodiment. Considering that the light intensity of the light changes due to the difference of the propagation distance, that is, the farther the light irradiation distance is, the weaker the light intensity of the light is, the convex light-emitting side surface 24 converges the passing upper half light, so that the light intensity of the emitted light at the farther distance on the document is enhanced, the attenuation of the light at the farther distance is compensated, and the emitted light intensity is uniform within the irradiation range of the light-emitting side surface 24, the change rate of the light intensity is small, and the stability of the irradiated light is good. As shown in fig. 9, it shows a schematic structural diagram of a fourth embodiment of the line light source of the present invention. Compared with the first embodiment, a part of the light-exiting side surface 24 is a plane, and the other part of the light-exiting side surface 24 is a concave surface protruding toward the bottom side surface 23; the angle β of the light guide 20 to the horizontal plane is 5 ° larger than that of the first embodiment (β is an angle between the parallel light emitted from the linear light source and the horizontal plane, and β is smaller than 90 °), so that light is irradiated to a relatively far place. Except for the above-described differences, the structure of the fourth embodiment is the same as that of the first embodiment. Considering that the light intensity of the light varies according to the distance of propagation, the light is weaker as the distance of light irradiation is longer. Under the condition that the light of the linear light source is strong, the original document with a long light irradiation distance is irradiated by using a large beta angle and the light-emitting side surface 24 as a plane, and the original document with a short light irradiation distance is irradiated by using the light-emitting side surface 24 as a concave surface, so that the light intensity of the light irradiated on the original document is equivalent, and a stable scanning effect is obtained.
As shown in fig. 9, it shows a schematic structural diagram of a fourth embodiment of the line light source of the present invention. Compared with the first embodiment, a part of the light-exiting side surface 24 is a plane, and the other part of the light-exiting side surface 24 is a concave surface protruding toward the bottom side surface 23; the angle β of the light guide 20 to the horizontal plane is 5 ° larger than that of the first embodiment, and the light is irradiated to a relatively distant place. Except for the above-described differences, the structure of the fourth embodiment is the same as that of the first embodiment. Considering that the light intensity of the light varies according to the distance of propagation, the light is weaker as the distance of light irradiation is longer. Under the condition that the light of the linear light source is strong, the original document with a long light irradiation distance is irradiated by using a large beta angle and the light-emitting side surface 24 as a plane, and the original document with a short light irradiation distance is irradiated by using the light-emitting side surface 24 as a concave surface, so that the light intensity of the light irradiated on the original document is equivalent, and a stable scanning effect is obtained.
In designing the parabolic reflecting side surface 25 in the light guide 20, the analytic geometric equation of the parabola is set to y2At this time, since the value of the coefficient p determines the actual size of the light guide 20, the value of the coefficient p is determined by the size of the light source installation space 41, and the design workerIn the long-term and multiple experimental calculation process, the staff obtains a series of size parameters of the light guide body 20 designed according to the light source installation spaces with different sizes.
As shown in fig. 11 to 14, fig. 11 shows the effect diagrams of the light irradiated onto the original of the linear light source of the first embodiment, fig. 12 shows the effect diagrams of the light irradiated onto the original of the linear light source of the second embodiment, fig. 13 shows the effect diagrams of the light irradiated onto the original of the linear light source of the third embodiment, and fig. 14 shows the effect diagrams of the light irradiated onto the original of the linear light source of the fourth embodiment. From the effect shown in the figure, compared with the line light source in the prior art, it can be known that the light intensity of the light emitted by the line light source of the present invention is high and the variation is small in the range of 0mm to 3mm in the predetermined document path (i.e. the document path of the image scanning apparatus in the present application), and compared with the light source in the prior art, the line light source has the characteristic of uniform light intensity. In the first to fourth embodiments, the range of 0mm to 3mm of the document path (starting from the surface of the transmission glass plate 50 on which the original is placed) is set, and in the first embodiment, the maximum light intensity of the light is 100%, and the variation range of the light intensity is set to 20%; the maximum light intensity of the light in the second embodiment is 115%, and the variation range of the light intensity is within 5%; the maximum light intensity of the light in the third embodiment is 100%, and the variation range of the light intensity is within 5%; the maximum light intensity of the light in the fourth embodiment is 90%, and the variation range of the light intensity is within 10%; the maximum light intensity of the light of the common light source is 60%, and the variation range of the light intensity is within 30%. Compared with the existing common light source, the linear light source of the four embodiments of the invention has greatly improved performance in the maximum light intensity and the light intensity variation range.
According to another aspect of the present invention, there is provided an image sensor including the aforementioned line light source.
As shown in fig. 4, it shows a schematic structural diagram of a first embodiment of the image sensor of the present invention. The image sensor of the first embodiment applies the line light source of the first embodiment of the present invention, which is installed at β 55 °, as a light source for illuminating an original document. Since the light-emitting side surface 24 of the line light source applied to the image sensor of the first embodiment is a plane, after light emitted by the LED point light source 10 is reflected in a series, the light is irradiated onto the surface of the original in parallel by the light-emitting side surface 24, so as to illuminate the scanned content a on the original, and by controlling the installation angle β of the line light source, parallel light rays are irradiated onto the document feeding channel section, and since the light rays emitted in parallel are all irradiated onto the predetermined document feeding channel section, light loss is avoided, and the light utilization efficiency is improved. By using the line light source of the first embodiment, light is irradiated into the range of the document feeding channel D, the divergence angle of the light emission is small, and the effect of efficient directional light emission is achieved.
The two reflecting side surfaces 25 are parabolic molded surfaces, so that light emitted by the LED point light source can be reflected by the reflecting side surfaces to form approximately parallel emitted light, the light irradiates the range of the manuscript walking channel D, the divergence angle of the emitted light is small, the efficient directional light emitting effect is realized, the loss outside the manuscript walking channel is avoided, and the light utilization efficiency is further improved; then the light is refracted by the light-emitting side and then irradiated, and the light emitted from the luminous body is uniform in light intensity in a preset range through the convergence or divergence of the light by the side, so that a light source with uniform light intensity can be obtained, the light emitted from the linear light source is small in variation, and the effect of nearly the same brightness on the irradiated object can be obtained.
In the first embodiment of the image sensor of the present invention, the image sensor further includes a mounting frame 40, a transmission glass plate 50, a lenticular lens 70, and a photoelectric conversion structure 80, the mounting frame 40 has a light source mounting space 41 and a lens mounting space 42 which are arranged at an interval, a line light source is mounted in the light source mounting space 41, wherein the line light source is mounted in the light source mounting space 41, the transmission glass plate 50 is covered on an upper opening end of the mounting frame 40, the transmission glass plate 50 is used for carrying an original, light emitted from the line light source is irradiated on the original, the lenticular lens 70 is mounted in the lens mounting space 42, the lenticular lens 70 receives reflected light reflected from the original, the photoelectric conversion structure 80 is mounted at the bottom of the mounting frame 40, and the photoelectric conversion structure 80 receives light transmitted from the lenticular lens 70 and converts an optical signal into an electrical signal to output. After the light irradiates the scanned content a of the original document, the original document reflects the light with the information of the scanned content a to the lenticular lens 70, the lenticular lens 70 transmits and collects the light with the information of the scanned content a to the photoelectric conversion structure 80, then the scanned content a carried in the optical signal is converted into an electrical signal to be output, and the information of the scanned content a is recorded on the scanned piece.
As shown in fig. 4, the photoelectric conversion structure 80 in the first embodiment of the image sensor of the present invention includes a photoelectric signal conversion circuit board 81 and a photoelectric conversion chip 82, the photoelectric signal conversion circuit board 81 is connected to the mounting frame 40, the photoelectric conversion chip 82 is mounted on the photoelectric signal conversion circuit board 81, and the photoelectric conversion chip 82 is disposed opposite to the lenticular lens 70. The photoelectric conversion chip 82 senses the light transmitted from the lenticular lens 70, then transmits the information of the scanned content a carried in the light to the photoelectric signal conversion circuit board 81 for analysis processing of the photoelectric signal, and finally converts the information of the scanned content a carried in the sensed received light signal into an electrical signal for storage or printing.
As shown in fig. 6, it shows a schematic structural diagram of a second embodiment of the image sensor of the present invention. The image sensor of the second embodiment applies the line light source of the second embodiment of the present invention as a light source for irradiating an original document. The image sensor of the second embodiment is the same as the image sensor of the first embodiment except that a different form of line light source is applied. Compared with the image sensor of the first embodiment, the image sensor of the second embodiment has the advantages that the two reflecting side surfaces 25 of the light guide body 20 of the linear light source of the image sensor of the second embodiment are both reflecting side surfaces formed by smoothly connecting parabolic molded surfaces and total reflection planes, the upper and lower sections of total reflection surfaces converge the passing light, the emitted light is irradiated on the scanning content A point of the document feeding channel, the upper portion converges to a large extent, the lower portion converges to a small extent, the light intensity of the light is high and uniform in the document feeding channel range, and the scanning content A on the original document still can obtain sufficient light brightness under the condition that high-speed scanning needs sufficient linear light source intensity, so that clear and qualified scanning content is scanned.
As shown in fig. 8, which shows a schematic structural diagram of a third embodiment of the image sensor of the present invention, the image sensor of the third embodiment applies the line light source of the third embodiment of the present invention as a light source for illuminating an original. The image sensor of the third embodiment is the same as the image sensor of the first embodiment except that a different form of line light source is applied. In the third embodiment of the image sensor, since a part of the light-emitting side surface of the linear light source therein is a convex surface and another part thereof is a flat surface, at this time, the light reflected to the light-emitting side surface 24 is emitted from the light-emitting side surface of the convex portion and then irradiated in a refraction and convergence manner, and the light reflected to the light-emitting side surface 24 is emitted from the light-emitting side surface of the flat portion and then irradiated in a parallel manner, so that the light intensity of the light emitted from the light-emitting side surface of the convex portion is stronger than the light intensity of the light emitted from the light-emitting side surface of the flat portion. In the floating range of the manuscript channel, the light emitted from the light-emitting side surface of the plane part is irradiated in the range, close to the transmission glass plate 50, of the manuscript channel, and the light emitted from the light-emitting side surface of the convex part is irradiated in the range, far from the transmission glass plate 50, of the manuscript channel, so that the brightness of the manuscript illuminated by the linear light source is close to the same when the manuscript passes through the floating range of the manuscript channel in a floating mode.
As shown in fig. 10, which shows a schematic configuration diagram of a fourth embodiment of the image sensor of the present invention, the image sensor of the fourth embodiment employs the light source of the fourth embodiment of the present invention as a light source for illuminating an original document. Compared with the image sensor of the first embodiment, the image sensor of the fourth embodiment has the same structure except that different types of line light sources are applied and the placement angles β of the line light sources are different. In the fourth embodiment of the image sensor, by adjusting the placement angle β of the line light source to 60 °, the light is irradiated to a distance from the document path, and a wider range of light irradiation of the document path D can be realized. Because a part of the light-emitting side surface of the linear light source therein is a plane and the other part is a concave surface (the concave surface is positioned below the plane), at this time, the light reflected to the light-emitting side surface 24 still irradiates in a parallel manner after being emitted from the light-emitting side surface 24 of the plane part, and the light reflected to the light-emitting side surface 24 of the concave surface is refracted and diffused by the light-emitting side surface 24 of the concave surface, so that the light intensity of the light emitted from the light-emitting side surface of the plane part is stronger than that of the light emitted from the light-emitting side surface of the concave surface part. In the floating range of the manuscript channel, the original manuscript is irradiated in the range far away from the transmission glass plate 50 by the light emitted from the light-emitting side surface of the plane part, and is irradiated in the range close to the transmission glass plate 50 by the light emitted from the light-emitting side surface of the concave part, so that the brightness of the original manuscript illuminated by the linear light source is close to the same when the original manuscript floats in the manuscript channel.
According to still another aspect of the present invention, there is provided an image scanning apparatus including the aforementioned image scanning sensor, wherein the image scanning apparatus further includes a document feeding mechanism 60, the document feeding mechanism 60 is disposed above the mounting frame 40 of the image sensor, and a document feeding path is formed between the document feeding mechanism 60 and a transmission glass of the image sensor, and light emitted from a line light source of the image sensor is irradiated onto an original document passing through the document feeding path. Preferably, the document feeding mechanism 60 is a set of paper feeding rollers that feed paper sheets into the document feeding path to pass therethrough in a floating manner. The document path is located above the transmission glass plate 50, and the light passes through the transmission glass plate 50 and then directly irradiates the scanned content a on the original document, so that the scanned content a is illuminated to meet the brightness requirement of scanning.
The longitudinal width of the document feeding channel in the first embodiment of the image sensor is D, and D is more than or equal to 2.0mm and less than or equal to 3.0 mm. The original document is fed into the document feeding path by the document feeding mechanism 60, and the original document passes through the document feeding path in a floating manner within a range D. In this embodiment, the longitudinal height D of the document path is preferably 3.0 mm.
By applying the technical scheme of the line light source, the image sensor and the image scanning device, light is emitted out in a manner of approaching to parallel by using the reflection effect of the reflection side surface 25 of the light guide body 20, and the light incident to the document feeding channel is converged by using the convex surface arrangement of the light-emitting side surface 24, or the light incident to the document feeding channel is diverged by using the concave surface arrangement of the light-emitting side surface 24, so that the utilization efficiency of the light is further improved according to the actual application requirement. The light incident to the far part of the manuscript walking channel is converged or the light incident to the near part of the manuscript walking channel is diverged, so that the attenuation of the light at the far part is compensated or the light intensity of the light at the near part is reduced, the intensity of the light at the far part and the light at the near part of the manuscript walking channel is uniform, and the problem of image scanning shadow caused by large intensity difference of the light at the far part and the light at the near part of the manuscript walking channel in the prior art is solved
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 (12)
1. A line light source, comprising:
an LED point light source (10), wherein the LED point light source (10) is mounted on an LED-PCB (11);
the LED point light source comprises a light guide body (20), the light guide body (20) is connected with an LED connecting end shell (12), the LED point light source (10) is arranged opposite to the light guide body (20) through the LED connecting end shell (12), the light guide body (20) is provided with a first side surface (21) and a second side surface (22) which are arranged oppositely, a bottom side surface (23) and a light-emitting side surface (24) which are arranged oppositely, and a reflection side surface (25) which is arranged between the bottom side surface (23) and the light-emitting side surface (24), the LED point light source (10) is positioned on the end portion of the first side surface (21) of the light guide body (20), and light emitted by the LED point light source (10) is emitted to the second side surface (22) from the first side surface;
a light-reflecting pattern (30), said light-reflecting pattern (30) being disposed on said bottom side (23); wherein,
part or all of the contour line of the reflecting side surface (25) is a parabola, and the bottom side surface (25) passes through the focus of the parabola.
2. The line light source according to claim 1, wherein the light guide body (20) has two of said reflective side surfaces (25) oppositely disposed, both of said reflective side surfaces (25) being parabolic in profile;
or the two reflecting side surfaces (25) are formed by smoothly connecting parabolic molded surfaces and total reflection planes;
or one of the reflecting side surfaces (25) is a parabolic profile, and the other reflecting side surface (25) is formed by smoothly connecting the parabolic profile and a total reflection plane;
or one of the reflecting side surfaces (25) is a parabolic profile, and the other reflecting side surface (25) is formed by smoothly connecting the parabolic profile and a total reflection curved surface.
3. The line light source of claim 2, wherein the light exit side (24) is planar.
4. The line light source of claim 2, wherein the light exit side surface (24) is convex, the convex surface protruding in a direction away from the bottom side surface (23).
5. The line light source of claim 2, wherein the light exit side surface (24) is concave, the concave surface protruding towards the bottom side surface (23).
6. The line light source of claim 2, wherein a portion of the light exit side surface (24) is planar and another portion of the light exit side surface (24) is concave, the concave surface protruding towards the bottom side surface (23).
7. The line light source of claim 2, wherein the light exit side surface (24) is substantially planar and another portion of the light exit side surface (24) is convex, the convex protruding in a direction away from the bottom side surface (23).
8. An image sensor comprising the line light source of any one of claims 1 to 7.
9. The image sensor of claim 8, further comprising:
a mounting frame (40), the mounting frame (40) having a light source mounting space (41) and a lens mounting space (42) which are arranged at intervals, the linear light source being mounted in the light source mounting space (41);
a transmission glass plate (50), wherein the transmission glass plate (50) is covered on the upper opening end of the mounting frame (40), and the transmission glass plate (50) is used for bearing an original;
a lenticular lens (70), the lenticular lens (70) being installed in the lens installation space (42), the lenticular lens (70) receiving reflected light reflected from the original;
the photoelectric conversion structure (80) is installed at the bottom of the installation frame (40), and the photoelectric conversion structure (80) receives the light transmitted by the cylindrical lens (70) and converts the light signal into an electric signal to be output.
10. The image sensor of claim 9, wherein the photoelectric conversion structure (80) comprises:
a photoelectric signal conversion circuit board (81), the photoelectric signal conversion circuit board (81) being mounted on the frame (40);
and the photoelectric conversion chip (82), wherein the photoelectric conversion chip (82) is installed on the photoelectric signal conversion circuit board (81), and the photoelectric conversion chip (82) is arranged opposite to the cylindrical lens (70).
11. An image scanning apparatus, characterized in that the image scanning apparatus comprises the image sensor according to any one of claims 8 to 10, wherein the image scanning apparatus further comprises a document feeding mechanism (60), the document feeding mechanism (60) is arranged above a mounting frame (40) of the image sensor, a document feeding passage is formed between the document feeding mechanism (60) and a transmission glass plate (50) of the image sensor, and light emitted from a line light source of the image sensor irradiates an original document passing through the document feeding passage.
12. The image sensor of claim 11, wherein the document path has a longitudinal width D, D being set in a range of 2mm to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510742736.0A CN105376451B (en) | 2015-11-04 | 2015-11-04 | Linear light source, imaging sensor and image scanning apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510742736.0A CN105376451B (en) | 2015-11-04 | 2015-11-04 | Linear light source, imaging sensor and image scanning apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105376451A true CN105376451A (en) | 2016-03-02 |
| CN105376451B CN105376451B (en) | 2019-01-08 |
Family
ID=55378226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510742736.0A Active CN105376451B (en) | 2015-11-04 | 2015-11-04 | Linear light source, imaging sensor and image scanning apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105376451B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429869A (en) * | 2018-03-22 | 2018-08-21 | 威海华菱光电股份有限公司 | Image read-out |
| CN110785988A (en) * | 2017-06-28 | 2020-02-11 | 三菱电机株式会社 | Light guide and image reading apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120087146A1 (en) * | 2010-10-07 | 2012-04-12 | Sony Corporation | Light-emitting device and image display apparatus |
| CN102681080A (en) * | 2011-03-10 | 2012-09-19 | 旭丽电子(广州)有限公司 | Linear light source, light guiding body and optical scanning module |
| CN103227884A (en) * | 2012-01-31 | 2013-07-31 | 京瓷办公信息系统株式会社 | Light guide member, illuminating device, and image reading apparatus and image forming apparatus using same |
| CN203365715U (en) * | 2013-06-19 | 2013-12-25 | 辅讯光电工业（苏州）有限公司 | Light guide plate, backlight module having same and display device |
| CN204314498U (en) * | 2014-12-12 | 2015-05-06 | 深圳市山本光电股份有限公司 | A kind of light guide plate |
-
2015
- 2015-11-04 CN CN201510742736.0A patent/CN105376451B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120087146A1 (en) * | 2010-10-07 | 2012-04-12 | Sony Corporation | Light-emitting device and image display apparatus |
| CN102681080A (en) * | 2011-03-10 | 2012-09-19 | 旭丽电子(广州)有限公司 | Linear light source, light guiding body and optical scanning module |
| CN103227884A (en) * | 2012-01-31 | 2013-07-31 | 京瓷办公信息系统株式会社 | Light guide member, illuminating device, and image reading apparatus and image forming apparatus using same |
| CN203365715U (en) * | 2013-06-19 | 2013-12-25 | 辅讯光电工业（苏州）有限公司 | Light guide plate, backlight module having same and display device |
| CN204314498U (en) * | 2014-12-12 | 2015-05-06 | 深圳市山本光电股份有限公司 | A kind of light guide plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110785988A (en) * | 2017-06-28 | 2020-02-11 | 三菱电机株式会社 | Light guide and image reading apparatus |
| CN108429869A (en) * | 2018-03-22 | 2018-08-21 | 威海华菱光电股份有限公司 | Image read-out |
| CN108429869B (en) * | 2018-03-22 | 2024-02-06 | 威海华菱光电股份有限公司 | Image reading apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105376451B (en) | 2019-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101392519B1 (en) | Light source apparatus | |
| JP4793288B2 (en) | Light guide and bifurcated linear light source device | |
| US8109666B2 (en) | Light guiding member and linear light source apparatus using same | |
| US4847734A (en) | Light emitting element array | |
| JP5299660B2 (en) | Illumination apparatus, image reading apparatus, and image forming apparatus | |
| US8167475B2 (en) | Linear lighting apparatus and image reader using the same | |
| JP5144904B2 (en) | Document irradiation device | |
| JPH11284803A (en) | Linear light source unit | |
| US7591576B2 (en) | Illuminator and image reader employing it | |
| KR19980079882A (en) | Onboard beam exit device | |
| US6563609B1 (en) | Linear illuminator | |
| JP5018657B2 (en) | Illumination device and image reading device | |
| JP4962469B2 (en) | Illumination apparatus and image reading apparatus equipped with the same | |
| CN105376451B (en) | Linear light source, imaging sensor and image scanning apparatus | |
| WO2005001528A1 (en) | Light guide and image reader | |
| JP2007183470A (en) | Light guide member | |
| JP5012790B2 (en) | Illumination device and image reading device using the same | |
| WO2005001529A9 (en) | Light guide and line illuminator | |
| CN205105294U (en) | Line source, image sensor and image scanning equipment | |
| US20140354867A1 (en) | Linear light source apparatus and image reading apparatus | |
| JP2011071696A (en) | Illuminator and image reader | |
| US20060152777A1 (en) | Image processing method and apparatus capable of effectively reading an image using a light diffuser | |
| US7715063B2 (en) | CVT integrated illuminator | |
| JP2000307807A (en) | Linear light source unit | |
| JP2785758B2 (en) | Linear light source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |