TW201903509A - Photosensitive device with inclined background sheet and photographic method thereof - Google Patents

Abstract

A light sensing apparatus comprises a sheet passage, a first sensing assembly and a first background sheet. The sheet passage has a scan window. The first sensing assembly disposed on a first side of the scan window outputs first scan light to the scan window. The first background sheet disposed on a second side of the scan window has a first reflective surface reflecting the first scan light, passing through the scan window, back to the first sensing assembly through the scan window. The first reflective surface and the scan window are disposed in a non-parallel manner. Therefore, the light sensing method is also provided to achieve the standard light calibration and the effect of boundary detecting.

Description

   Photosensitive device with inclined background film and photosensitizing method   

The invention relates to a photosensitive device and a photosensitive method thereof, and more particularly to a photosensitive device with a tilted background film and a photosensitive method thereof.

Generally speaking, in the conventional photosensitive device of the paper-fed scanner, since a standard white calibration is performed, a white background film is required for the photosensitive module to perform calibration. In addition, most documents have a white background. Therefore, the brightness of the white background detected by the photosensitive module is usually not much different from the brightness of the background film. The light-sensitive component calibrates brightness and auto-crop, so a black background film is used to assist the edge-finding action. Conversely, the black background film cannot be used to perform the brightness correction of the photosensitive component, so a white background film is required to complete the brightness correction of the photosensitive component. Therefore, in order to complete the brightness correction and automatic edge trimming of the photosensitive component, the setting of two background films is required, and the mechanism design is also relatively complicated.

In the traditional technology, in order to have both a black background film and a white background film, US7441704 sets the black background film and the white background film on the same axis: when the calibration is started, the white background film faces the window and the photosensitive component corrects the brightness. ; When scanning the paper, the coaxial background is used to make the black background face the window, so that the sensor element can clearly identify the boundary between the black background and the paper, and then automatically trim the edges. In another traditional technical solution, a gray background film is used to achieve the brightness correction of the white background film and the automatic edge trimming of the black background film; however, the color of the gray background film is harmonized, so in preparation It is not easy to obtain a uniform color, which leads to errors in the brightness correction of the photosensitive component.

Therefore, how to provide a light-sensitive device capable of performing uniform calibration and brightness correction and auto-crop of a light-sensitive component with a uniform background color is a problem to be solved in this case.

An object of the present invention is to provide a photosensitive device having a tilted background film and a photosensitive method thereof, which are used to provide a function of uniformly correcting the brightness and automatic edge trimming of a stable photosensitive component with a uniform background color.

To achieve the above object, the present invention provides a photosensitive device including a paper feed channel, a first photosensitive component, and a first background film. The paper path has a scanning window. The first photosensitive component is disposed on a first side of the scanning window and emits a first scanning light toward the scanning window. The first background film is disposed on a second side of the scanning window and has a first reflecting surface. The first reflecting surface reflects the first scanning light passing through the scanning window through the scanning window and returns to the first photosensitive component. The first reflection surface of the first background film and the scanning window are arranged non-parallel.

The above-mentioned photosensitive device may further include a second photosensitive component and a second background film. The second photosensitive element is disposed on the second side of the scanning window and emits a second scanning light toward the scanning window. The second background film is disposed on the first side of the scanning window and has a second reflecting surface. The second reflecting surface reflects the second scanning light passing through the scanning window through the scanning window and returns to the second photosensitive element. The second reflecting surface of the second background film and the scanning window are arranged non-parallel.

In the above-mentioned photosensitive device, when a data medium is fed through a scanning window by a feeding mechanism of the photosensitive device along the paper path, a first part of the first scanning light is reflected back to the first photosensitive by a first surface of the data medium. The component generates a first scanning signal, and a second part of the first scanning light is reflected back to the first photosensitive component by the first background sheet to generate a first background signal.

The present invention also provides a light sensing method, which is applied to the above-mentioned light sensing device. The light sensing method includes the following steps: feeding a data medium into a paper path; and generating a mixed signal of a first scanning signal and a first background signal according to the following steps: Before the medium passes through the scanning window, the first photosensitive component senses the second portion of the first scanning light; when the data medium passes through the scanning window, the first photosensitive component senses the first portion and the second portion of the first scanning light; and After the data medium passes through the scanning window, the first photosensitive component is caused to sense the first part of the first scanning light; and the first scanning signal is separated from the mixed signal according to the characteristics of the first background signal.

With the above-mentioned photosensitive device, a tilted background film can be used to provide a uniform grayscale background, which is different from the white background of the data medium, and achieves the functions of the photosensitive component to correct the brightness and automatically cut. In addition, the driving mechanism can drive the background film to rotate to a horizontal state to provide the effect of brightness correction. In addition, the driving mechanism can drive the background film to rotate to other tilt angles to provide different grayscale background effects. The above features can be completed with a single oblique background film, with a simple structure and significant effects, which can provide an effective background detection effect for a paper-fed scanner.

In order to make the above content of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings, as follows.

A‧‧‧ size

A1‧‧‧First angle

A2‧‧‧ second angle

B‧‧‧ size

BD‧‧‧ border

IB‧‧‧Image

IM‧‧‧Image

L1‧‧‧First scanning light

L2‧‧‧Second scanning light

M‧‧‧ Information Media

M1‧‧‧First side

M2‧‧‧Second Side

R1, R2, R3‧‧‧ reflected light

S1‧‧‧First scan signal

S2‧‧‧First background signal

S3‧‧‧Second scan signal

S4‧‧‧Second background signal

S5‧‧‧first correction signal

S6‧‧‧Second calibration signal

ST1 to ST3 ‧‧‧ steps

1‧‧‧ Photosensitive equipment

3‧‧‧Feeding mechanism

3A, 3B, 3C, 3D‧‧‧Feed roller

10‧‧‧paper path

11‧‧‧scan window

20‧‧‧The first photosensitive component

21‧‧‧first light emitting element

21A‧‧‧Light source

21B‧‧‧light guide

22‧‧‧first sensor

22A‧‧‧lens array

22B‧‧‧Sense Element Array

30‧‧‧ the first background film

30A‧‧‧First reflecting surface

40‧‧‧The first transparent substrate

50‧‧‧Second transparent substrate

60‧‧‧Second photosensitive element

61‧‧‧Second light emitting element

61A‧‧‧Light source

61B‧‧‧light guide

62‧‧‧Second sensing element

62A‧‧‧lens array

62B‧‧‧Sense Element Array

70‧‧‧ Second background film

70A‧‧‧Second reflective surface

80‧‧‧first drive mechanism

85‧‧‧second drive mechanism

90‧‧‧ processor

1 and 2 are schematic views showing two states of a photosensitive device according to a preferred embodiment of the present invention.

FIG. 3 shows a schematic diagram of a light emitting element and a sensing element.

4A and 4B show an example of the optical path diagrams corresponding to FIGS. 1 and 2, respectively.

5A and 5B show another example of the optical path diagrams corresponding to FIGS. 1 and 2, respectively.

Figure 6 shows a schematic diagram of automatic cropping.

FIG. 7 shows a schematic diagram of skew correction.

FIG. 8 shows a flowchart of a light sensing method according to a preferred embodiment of the present invention.

The Linear Image Sensor is composed of a number of sensors. These sensors are arranged in a straight line with the same spacing, and generate different voltages on the intensity of the reflected light. There are charge-coupled element image sensors on the market. -coupled device (CCD) type image sensor) and contact image sensor (CIS). Especially CIS is widely used in scanners because of its low price. The embodiments of the present invention can be applied to the above-mentioned two types of sensors. Together with the inclined background film, it can provide a gray-scale background and be different from the white background of the data medium, so as to facilitate subsequent light-sensitive components for brightness correction and automatic cropping. Side execution.

1 and 2 are schematic views showing two states of a photosensitive device according to a preferred embodiment of the present invention. As shown in FIG. 1 and FIG. 2, the photosensitive device 1 of this embodiment is, for example, a paper-feed scanner, which captures an image of a data medium while feeding the data medium. Although the figure is implemented by a double-sided scanner, it is not intended to limit the invention to this, because a single-sided scanner can also achieve the effect of the invention. The photosensitive device 1 includes a paper feed path 10, a first photosensitive component 20 and a first background sheet 30. In this way, the effect of single-sided scanning can be implemented. In order to perform double-sided scanning, the photosensitive device 1 may further include a second photosensitive element 60 and a second background film 70.

The paper path 10 has a scanning window 11. The first photosensitive component 20 is disposed on a first side of the scanning window 11 and emits a first scanning light L1 toward the scanning window 11. The second photosensitive element 60 is disposed on a second side of the scanning window 11 and emits a second scanning light L2 toward the scanning window 11.

The first background film 30 is disposed on the second side of the scanning window 11 and has a first reflecting surface 30A to reflect the first scanning light L1 passing through the scanning window 11 through the scanning window 11 and return to the first photosensitive component 20 . The second background film 70 is disposed on the first side of the scanning window 11 and has a second reflecting surface 70A to reflect the second scanning light L2 passing through the scanning window 11 through the scanning window 11 and return to the second photosensitive component 60. . The first side and the second side are opposite sides, and the upper side and the lower side are described in FIG. 1. That is, the connecting lines between the first background sheet 30 and the first photosensitive element 20 intersect the scanning window 11.

In this embodiment, the first reflective surface 30A of the first background sheet 30 and the scanning window 11 are non-parallel, so that the first background sheet 30 provides a non-standard white background to achieve the effect of boundary detection. In addition, the second reflective surface 70A of the second background sheet 70 and the scanning window 11 are arranged non-parallel, so that the second background sheet 70 provides a grayscale background to achieve the effect of boundary detection. The first reflective surface 30A is a surface that reflects the first scanning light L1, and the second reflective surface 70A is a surface that reflects the second scanning light L2.

The above-mentioned photosensitive device 1 may further include a first light-transmitting substrate 40 and a second light-transmitting substrate 50, which are respectively disposed on both sides of the scanning window 11 and are located between the first photosensitive element 20 and the first background sheet 30, or Located between the second photosensitive element 60 and the second background sheet 70. In this embodiment, the first light-transmitting substrate 40 and the second light-transmitting substrate 50 are disposed in parallel, and both define the range of the scanning window 11. The material of the first transparent substrate 40 and the second transparent substrate 50 is selected from the group consisting of glass, polycarbonate (PC), polypropylene (Polypropylene (PP)), acrylonitrile-butadiene-styrene copolymer ( Acrylonitrile Butadiene Styrene (ABS) resin and polymethyl methacrylate (PMMA). In this embodiment, both the first background sheet 30 and the second background sheet 70 are in a long sheet shape, which can reduce the space between the light-transmitting substrate and the photosensitive component. In another embodiment, the first background sheet 30 and the second background sheet 70 may be presented in a triangular manner, so as to provide the effect of being conveniently mounted on a light-transmitting substrate or a photosensitive component. It is worth noting that the scanning window 11 is not necessarily defined by the first transparent substrate 40 and the second transparent substrate 50, it may also be defined by a single transparent substrate, or by a guide sheet having an opening. . In addition, the first transparent substrate 40 and the first reflective surface 30A of the first background sheet 30 are arranged non-parallel, and the second transparent substrate 50 and the second reflective surface 70A of the second background sheet 70 are arranged non-parallel.

In this embodiment, the first background film 30 and the scanning window 11 present a first angle A1 setting, the second background film 70 and the scanning window 11 present a second angle A2 setting, and the first angle A1 and the second angle A2 equal. In an example, the first angle A1 is between 3 ° and 30 °, and the light intensity induced by the plurality of first sensing elements 22 has a larger simulation of the reflection line generated under the inclined angle of this section. Gray scope. In another example, the first angle A1 is between 10 ° and 20 °, preferably between 12 ° and 15 °, and the light intensity sensed by the plurality of first sensing elements 22 in this section is inclined. The reflection lines produced at the angle have a clear range that simulates gray. In other words, when the first angle A1 and the second angle A2 are both 0 ° and the first background sheet 30 and the second background sheet 70 are white, the first sensing element 22 and the second sensing element 62 sense the most reflections. The light is the brightest; as the first angle A1 and the second angle A2 gradually increase, the more light reflected from the first background sheet 30 or / and the second background sheet 70, the first sensing element 22 and the first The darker the brightness sensed by the two sensing elements 62 is, the brighter the white that is sensed becomes the gray background; the larger the angle between the first angle A1 and the second angle A2 is, the first the sensing element 22 and the second sensing element 62 are. The weaker the intensity of the sensed light, the darker the gray. In this way, using the light reflected by the inclined first background film 30 and the second background film 70 as the light-sensitive component to correct the brightness, because of the oblique setting, part of the light is reflected or diffused, resulting in the first sensing element 22 Compared with the light absorbed by the second sensing element 62, when the background film is white in this embodiment, the light that is sensed is gray, that is, the sensed light gray is used as the standard color during correction.

In another example, the first angle A1 and the second angle A2 are not equal, so as to provide documents with different backgrounds on the front and back with appropriate different light intensities to simulate different background colors.

The first photosensitive component 20 includes a first light emitting element 21 and a plurality of first sensing elements 22. The second photosensitive element 60 includes a second light emitting element 61 and a plurality of second sensing elements 62. The first background sheet 30 is disposed opposite to the plurality of first sensing elements 22, and the second background sheet 70 is disposed opposite to the plurality of second sensing elements 62. The first light emitting element 21 emits a first scanning light L1 toward the scanning window 11, and the second light emitting element 61 emits a second scanning light L2 toward the scanning window 11. The plurality of first sensing elements 22 receive the first scanning light L1 reflected by the first background sheet 30, and the plurality of second sensing elements 62 receive the second scanning light L2 reflected by the second background sheet 70.

In addition to sensing the grayscale values of the first background film 30 and the second background film 70, the first photosensitive element 20 and the second photosensitive element 60 can also be used to scan a data medium M. When the data medium M is fed through the scanning window 11 by a feeding mechanism 3 of the photosensitive device 1 along the paper path 10, a first portion of the first scanning light L1 is reflected back to the first by a first surface M1 of the data medium M The photosensitive component 20 generates a first scanning signal S1. A second portion of the first scanning light L1 is reflected back to the first photosensitive element 20 by the first background sheet 30, and a first background signal S2 is generated. The first part and the second part of the first scanning ray L1 extend along the direction of the drawing surface and constitute the width direction of the data medium M (approximately perpendicular to the direction of travel of the data medium M. If the plane of FIG. 1 is the XY plane, the width Direction is the direction of the Z axis). A first portion of the second scanning light L2 is reflected by a second surface M2 of the data medium M back to the second photosensitive element 60 to generate a second scanning signal S3. A second portion of the second scanning light L2 is reflected by the second background sheet 70 back to the second photosensitive element 60 to generate a second background signal S4. The first part and the second part of the second scanning light L2 extend in the direction of the drawing surface, and constitute the illumination light in the width direction of the data medium M. In this embodiment, the feeding mechanism 3 includes feeding rollers 3A, 3B, 3C, and 3D. The scanning window 11 is between the feeding rollers 3A and 3B and the feeding rollers 3C and 3D, and the first optical path from the data medium M to the first sensing element 22 and the second optical path from the first background sheet 30 to the first sensing element 22 The optical path is approximately perpendicular to the data medium M and the paper path 10.

In order to perform the standard white correction, the photosensitive device 1 may further include a first driving mechanism 80 connected to the first background sheet 30; and a second driving mechanism 85 connected to the second background sheet 70. In a scanning mode, the first driving mechanism 80 drives the first reflective surface 30A of the first background film 30 to rotate relative to the first photosensitive element 20 to be non-parallel to the scanning window 11, and the second driving mechanism 85 drives the second The second reflecting surface 70A of the background sheet 70 is rotated relative to the second photosensitive member 60 to be disposed in non-parallel with the scanning window 11, that is, the state shown in FIG. 1.

In a calibration mode, the first driving mechanism 80 drives the first background film 30 to rotate relative to the first photosensitive element 20 to be substantially parallel to the scanning window 11, and the first photosensitive element 20 receives the first scanning light L1 to obtain a first A correction signal S5; and the second driving mechanism 85 drives the second background film 70 to rotate relative to the second photosensitive element 60 to be substantially parallel to the scanning window 11, and the second photosensitive element 60 receives the second scanning light L2 to obtain a second correction The signal S6 is the state shown in FIG. 2. In this way, a processor 90 of one of the photosensitive devices 1 can correct the first scan signal S1 according to the first correction signal S5, and correct the second scan signal S3 according to the second correction signal S6.

In other modes, the first driving mechanism 80 can also drive the first background film 30 to rotate to different angular positions to provide different grayscale backgrounds. The same technology can also be applied to the second driving mechanism 85 and the second background. Tablet 70.

It is worth noting that the view of FIG. 1 shows that both the first light path and the second light path may exist at the same time, because the first background film 30 is generally designed to be wider (the width direction is perpendicular to the paper surface of FIG. 1). ), And the data medium M may be narrower than the first background film 30, so the first optical path is located inside the data medium M, and the second optical path is located outside the data medium M.

FIG. 3 shows a schematic diagram of a light emitting element and a sensing element. As shown in FIG. 3, the first light-emitting element 21 includes two light sources 21A (a single light source may also be used) and a light guide post 21B. The light guide post 21B uniformizes and directs the light from the light source 21A to run downward. In addition, the first sensing elements 22 include a lens array 22A and a sensing element array 22B. Similarly, the second light-emitting element 61 includes two light sources 61A (a single light source may also be used) and a light guide post 61B. The light guide post 61B uniformizes and directs the light from the light source 61A to run downward. In addition, the first sensing elements 22 include a lens array 62A and a sensing element array 62B.

4A and 4B show an example of the optical path diagrams corresponding to FIGS. 1 and 2, respectively. As shown in FIGS. 4A and 4B, if the first scanning light L1 emitted by the first light-emitting element 21 follows the law of the incident angle equal to the reflection angle (refer to the normal N), the intensity of the reflected light R1 is the highest, but because the first A background film 30 itself is not a mirror surface, so there is some diffuse reflection phenomenon, which causes the intensity of the reflected light R2 and R3 to decrease. Therefore, the intensity of the reflected light (lower than the intensity of the reflected light R3) received by the first sensing element 22 in FIG. 4A is smaller than the intensity of the reflected light (higher than the intensity of the reflected light R3) received in FIG. 4B. Therefore, the inclined first background film 30 can provide a grayscale background to achieve the effect of boundary detection of the scanned image of the data medium.

5A and 5B show another example of the optical path diagrams corresponding to FIGS. 1 and 2, respectively. From another point of view, the length of the energy of the first scanning ray L1 of the first light emitting element 21 with the same divergence angle on the inclined first background sheet 30 is the size A, and the horizontal background sheet 30 is distributed. The length above is dimension B, where dimension A is larger than dimension B, so the inclined first background sheet 30 causes the energy of the light source to be dispersed, so that the energy of the light received by the first sensing element 22 decreases, that is, the brightness is sensed to decrease .

Figure 6 shows a schematic diagram of automatic cropping. FIG. 7 shows a schematic diagram of skew correction. As shown in FIG. 6 and FIG. 7, the scanned image includes the image IM of the data medium M in the inner circle and the image IB (enclosing the image IM) of the background film in the outer circle. The gray level (for example, 160) is significantly smaller than the gray level of the background of the image IM (brighter, and the gray level is, for example, 220), so the processor 90 can find a value corresponding to the first scan signal S1 according to the first background signal S2. One or more boundary BDs of the image IM, and the processor 90 searches for one or more boundary BDs of an image IM corresponding to the second scan signal S3 according to the second background signal S4. In this way, the processor 90 can perform automatic cropping and skew correction.

In another example, a fixed background film may also be used. In this case, the processor 90 may correct the first scan signal S1 according to the first background signal S2 and correct the second scan according to the second background signal S4. Signal S3. That is, the gray level corresponding to the background signal is known and can be corrected based on this gray level.

FIG. 8 shows a flowchart of a light sensing method according to a preferred embodiment of the present invention. As shown in FIG. 8, this embodiment also provides a photosensitive method, which is applied to the above-mentioned photosensitive device 1. The photosensitive method includes the following steps. First, in step ST1, the feed data medium M enters the paper feed path 10. Next, a mixed signal of the first scanning signal S1 and the first background signal S2 is generated according to the following steps: (a) Before the data medium M reaches the scanning window 11, the first photosensitive component 20 is caused to sense the first scanning light L1. The second part; (b) when the data medium M passes through the scanning window 11, the first photosensitive member 20 senses the first part and the second part of the first scanning light L1; and (c) the data medium M leaves the scanning window 11 After that, the first photosensitive component 20 is made to sense the first portion of the first scanning light L1. Finally, the first scanning signal S1 is separated from the mixed signal according to the characteristics of the first background signal S2. The characteristic of the first background signal S2 corresponds to the inclination angle of the first background sheet 30, that is, the grayscale of the first reflection surface 30A of the first background sheet 30 sensed by the first sensing element 22 described above. The mixed signal is, for example, a signal corresponding to the entire image in FIG. 6 or FIG. 7. In this way, you can achieve background detection for automatic cropping and skew correction.

With the above-mentioned photosensitive device and method, a tilted background film can be used to provide a grayscale background, which is different from the white background of the data medium, and achieves the functions of automatic cropping and skew correction. In addition, the driving mechanism can drive the background film to rotate to a horizontal state to provide the effect of brightness correction. In addition, the driving mechanism can drive the background film to rotate to other tilt angles to provide different grayscale background effects. The above features can be completed with a single background film, with a simple structure and outstanding effects, which can provide an effective background detection effect for the paper-fed scanner.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to facilitate the description of the technical content of the present invention, rather than limiting the present invention to the above embodiments in a narrow sense, without exceeding the spirit of the present invention and the following patent applications The scope of the scope, the implementation of various changes, all belong to the scope of the present invention.

Claims (26)

    A light-sensitive device includes: a paper feed channel having a scanning window; a first light-sensitive component disposed on a first side of the scanning window and emitting a first scanning light toward the scanning window; and a first background The film is disposed on a second side of the scanning window and has a first reflecting surface. The first reflecting surface reflects the first scanning light passing through the scanning window through the scanning window and returns to the first photosensitive Component; wherein the first reflective surface of the first background film and the scanning window are arranged non-parallel.         The photosensitive device according to claim 1, wherein the first photosensitive component includes a first light emitting element and a plurality of first sensing elements, the first light emitting element emits the first scanning light toward the scanning window, and the plurality of Each first sensing element receives the first scanning light reflected by the first background film.         The photosensitive device according to claim 2, wherein the first background film is disposed opposite to the plurality of first sensing elements.         The photosensitive device according to claim 2, wherein the first background film and the scanning window present a first angle setting, and the first angle is between 3 ° and 30 °.         The photosensitive device according to claim 2 or 4, wherein the standard color of the correction sensed by the plurality of first sensing elements is gray.         The photosensitive device according to claim 4, wherein the first angle is between 12 ° and 15 °.         The photosensitive device according to claim 6, wherein the corrected standard color sensed by the plurality of first sensing elements is gray.         The photosensitive device according to claim 1, further comprising a first light-transmitting substrate located between the first photosensitive element and the first background film.         The photosensitive device according to claim 8, wherein the material of the first transparent substrate is selected from the group consisting of glass, polycarbonate (PC), polypropylene (PP), and acrylonitrile-butadiene- A group consisting of styrene copolymer (Acrylonitrile Butadiene Styrene (ABS) resin) and polymethyl methacrylate (PMMA).         The photosensitive device according to claim 1, further comprising a first light-transmitting substrate and a second light-transmitting substrate, which are respectively disposed on both sides of the scanning window, and are located between the first photosensitive element and the first background film. between.         The photosensitive device according to claim 1, wherein when a data medium is fed through the scanning window by a feeding mechanism of the photosensitive device along the paper path, a first part of the first scanning light is used by the data medium. A first surface of the light is reflected back to the first photosensitive component, and a first scanning signal is generated. A second part of the first scanning light is reflected back to the first photosensitive component by the first background film, and a First background signal.         The photosensitive device according to claim 11, wherein a processor of the photosensitive device searches for one or more boundaries of an image corresponding to the first scan signal according to the first background signal.         The photosensitive device according to claim 11, wherein a processor of the photosensitive device corrects the first scanning signal according to the first background signal.         The photosensitive device according to claim 11, further comprising a first driving mechanism connected to the first background film, wherein: in a scanning mode, the first driving mechanism drives the first reflection of the first background film The surface is rotated in a non-parallel arrangement with the scanning window relative to the first photosensitive component; and in a correction mode, the first driving mechanism drives the first background film to rotate relative to the first photosensitive component to be approximately the same as the scanning window. Parallel, and the first photosensitive component receives the first scanning light to obtain a first calibration signal, and a processor of the photosensitive device corrects the first scanning signal according to the first calibration signal.         The photosensitive device according to claim 1, further comprising: a second photosensitive component disposed on the second side of the scanning window, and emitting a second scanning light toward the scanning window; and a second background film, setting Is located on the first side of the scanning window and has a second reflecting surface, and the second reflecting surface reflects the second scanning light passing through the scanning window through the scanning window and returns to the second photosensitive component, wherein , The second reflecting surface of the second background film and the scanning window are arranged non-parallel.         The photosensitive device according to claim 15, further comprising a first light-transmitting substrate and a second light-transmitting substrate, which are respectively disposed on both sides of the scanning window, and are located between the first photosensitive element and the first background film. between.         The photosensitive device according to claim 16, wherein the first transparent substrate and the second transparent substrate are disposed in parallel.         The photosensitive device according to claim 16, wherein the first light-transmitting substrate and the first reflecting surface of the first background sheet are disposed in non-parallel, and the second light-transmitting substrate and the second background sheet are not disposed in parallel with each other. The second reflecting surface is non-parallel.         The photosensitive device according to claim 15, wherein the first photosensitive component includes a first light emitting element and a plurality of first sensing elements, the first light emitting element emits the first scanning light toward the scanning window, and the plurality of First sensing elements receive the first scanning light reflected by the first background film; and the second photosensitive element includes a second light emitting element and a plurality of second sensing elements, and the second light emitting element emits toward the scanning window The second scanning light, and the plurality of second sensing elements receive the second scanning light reflected by the second background film.         The photosensitive device according to claim 15, wherein the first background film and the scanning window present a first angle setting, the second background film and the scanning window present a second angle setting, and the first angle and The second angles are not equal.         The photosensitive device according to claim 15, wherein the first background film and the scanning window present a first angle setting, the second background film and the scanning window present a second angle setting, and the first angle and The second angles are equal.         The photosensitive device according to claim 15, wherein when a data medium is fed through the scanning window by a feeding mechanism of the photosensitive device along the paper path, a first part of the first scanning light is used by the data medium. A first surface of the light is reflected back to the first photosensitive element to generate a first scanning signal; a second part of the first scanning light is reflected back to the first photosensitive element by the first background sheet, and a A first background signal; a first portion of the second scanning light is reflected back to the second photosensitive element by a second surface of the data medium to generate a second scanning signal; and a second of the second scanning light Part of it is reflected back to the second photosensitive element by the second background sheet, and a second background signal is generated.         The photosensitive device according to claim 22, wherein a processor of the photosensitive device searches for one or more boundaries of an image corresponding to the first scan signal according to the first background signal; and the processor according to the first The two background signals look for one or more boundaries of an image corresponding to the second scan signal.         The photosensitive device according to claim 22, wherein a processor of the photosensitive device corrects the first scan signal according to the first background signal, and corrects the second scan signal according to the second background signal.         The photosensitive device according to claim 22, further comprising: a first driving mechanism connected to the first background film; and a second driving mechanism connected to the second background film, wherein: in a scanning mode, The first driving mechanism drives the first background film to rotate in a non-parallel arrangement with the scanning window relative to the first reflecting surface of the first photosensitive component, and the second driving mechanism drives the first background film of the second background film. The two reflecting surfaces are rotated relative to the second photosensitive component to be arranged in a non-parallel manner with the scanning window; and in a correction mode, the first driving mechanism drives the first background film to rotate relative to the first photosensitive component to be scanned with the scan. The windows are substantially parallel, and the first photosensitive component receives the first scanning light to obtain a first correction signal; and the second driving mechanism drives the second background film to rotate relative to the second photosensitive component to be approximately the same as the scanning window. Parallel, and the second photosensitive component receives the second scanning light to obtain a second correction signal, and a processor of the photosensitive device corrects the first scan according to the first correction signal Number, and according to the second correction signal correcting the second scanning signal.         A light-sensitive method is applied to the light-sensitive device according to claim 11. The light-sensitive method includes the following steps: feeding the data medium into the paper path; and generating the first scan signal and the first background signal according to the following steps. A mixed signal of: (a) causing the first photosensitive element to sense the second portion of the first scanning light before the data medium reaches the scanning window; (b) when the data medium passes through the scanning window, Causing the first photosensitive component to sense the first portion and the second portion of the first scanning light; and (c) causing the first photosensitive component to sense the first scanning light after the data medium leaves the scanning window. The first part; and separating the first scanning signal from the mixed signal according to the characteristics of the first background signal.