CN113358656A

CN113358656A - Contact image sensor

Info

Publication number: CN113358656A
Application number: CN202110694903.4A
Authority: CN
Inventors: 王虎岩; 王彭通; 席伟腾; 王凤秀; 曹慧俐; 王家重
Original assignee: Weihai Hualing Opto Electronics Co Ltd
Current assignee: Weihai Hualing Opto Electronics Co Ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-09-07
Also published as: WO2022267863A1

Abstract

The invention provides a contact image sensor. The contact image sensor includes: a frame having a receiving cavity; the light source is positioned in the accommodating cavity and used for emitting a detection light beam; the light splitting part is positioned in the accommodating cavity, is positioned on one side of the light source and is used for splitting the detection light beam emitted by the light source into reflected light rays and transmitted light rays; and the light receiving part comprises a lens which is positioned in the accommodating cavity and used for converging light rays, and the reflected light rays vertically enter the object to be scanned and vertically enter the lens after being reflected by the object to be scanned based on the reflection principle. The technical scheme of the invention solves the problem that the contact image sensor in the prior art is easy to read all information of the object to be scanned when the object to be scanned with a smooth surface or an uneven surface is scanned.

Description

Contact image sensor

Technical Field

The invention relates to the technical field of image detection, in particular to a contact type image sensor.

Background

At present, two methods are mainly adopted in the field of industrial image detection, one is an area array camera (CCD) and various light sources, and the other is a contact image sensor. The contact type image sensor is linear scanning, and has the advantages of wide breadth, compact structure, space saving, 1:1 image, no distortion and the like.

However, the touch sensor of the related art has a small application range. On one hand, when the contact image sensor scans an uneven object to be scanned, the object to be scanned has a convex part, and an incident angle exists between a detection light and the surface of the object to be scanned, so that a part of the detection light emitted by the light source cannot irradiate the root of the convex part of the object to be scanned, and therefore the light in the area is insufficient (namely the brightness of the area is low), and further the corresponding position of the scanned image and the area is shaded, so that the image scanning effect is realized, and the problem that the area cannot be identified is caused. On the other hand, when the object to be scanned is an object having a smooth surface (i.e., an object having a high reflectance to light) such as glass or a bright metal plate, the probe light emitted from the light source is irradiated to a point of the object to be scanned which is located above the lens, because of the incident angle between the detection light and the surface of the object to be scanned, most of the light can be reflected out in a mirror reflection mode, and the light entering the lens in a diffuse reflection mode is little, and when the detection light is irradiated to another point of the object to be scanned which is staggered with the lens (i.e. another point has a gap with the one point), due to the angle of incidence and specular reflection between the probe light and the surface of the object to be scanned, a large portion of the light enters the lens, thus, the light reflected from another point will cover the diffuse reflection light from the above-mentioned one point, and thus the above-mentioned one point above the lens will not be able to read information.

In summary, the contact image sensor is prone to have a problem that local information of an object to be scanned cannot be read when the object to be scanned is scanned with a smooth surface or an uneven surface.

Disclosure of Invention

The invention mainly aims to provide a contact image sensor to solve the problem that local information of an object to be scanned cannot be read easily when the contact image sensor in the prior art scans the object to be scanned with a smooth surface or an uneven surface.

In order to achieve the above object, the present invention provides a contact image sensor comprising: a frame having a receiving cavity; the light source is positioned in the accommodating cavity and used for emitting a detection light beam; the light splitting part is positioned in the accommodating cavity, is positioned on one side of the light source and is used for splitting the detection light beam emitted by the light source into reflected light rays and transmitted light rays; and the light receiving part comprises a lens which is positioned in the accommodating cavity and used for converging light rays, and the reflected light rays vertically enter the object to be scanned and vertically enter the lens after being reflected by the object to be scanned based on the reflection principle.

Further, the contact image sensor further comprises a light absorption part located on the inner wall surface of the accommodating cavity, the light absorption part and the light source are respectively located on two sides of the light splitting part, and the transmission light is absorbed by the light absorption part.

Furthermore, an included angle A is formed between the detection light beam emitted by the light source and the incident surface of the light splitting part, and the included angle A satisfies the following conditions: a is more than or equal to 10 degrees and less than or equal to 80 degrees, so that the reflected light rays from the light splitting part in the detection light beam vertically enter the object to be scanned.

Further, the probe beam is perpendicular to the optical axis of the lens, and the included angle a is 45 °.

Further, the contact image sensor further comprises a scattering plate used for scattering the detection light beam, the light source, the scattering plate and the light splitting part are sequentially arranged along the light path, and the scattering plate is located between the light source and the light splitting part.

Further, the contact image sensor further comprises a light-gathering part for gathering the detection light beams, the light source, the light-gathering part and the light-splitting part are sequentially arranged along the light path, and the light-gathering part is positioned between the light source and the light-splitting part.

Further, the frame comprises a supporting frame and a light-transmitting plate for the probe light to pass through, the light-transmitting plate and the supporting frame enclose a containing cavity, and the light source and the light splitting part are positioned above the lens.

Further, the frame includes two support frames and a plurality of light-passing boards that correspond with two support frames, and light source and light-splitting part all are located one of two support frames in, and light receiving part is located another one of two support frames.

Furthermore, the two supporting frames are positioned at two opposite sides of the object to be scanned, the supporting frame provided with the light source is provided with an opening, the opening is provided with a light-transmitting plate, the contact type image sensor further comprises a light reflecting part, the reflected light and the transmitted light penetrate through the light-transmitting plate after being reflected by the light reflecting part and then enter the object to be scanned, and the light reflecting part and the light source are positioned at two opposite sides of the light splitting part, or the light reflecting part and the light-transmitting plate are positioned at two opposite sides of the light splitting part.

Furthermore, the light source, the light splitting part and the light receiving part are positioned on the same side of the object to be scanned.

Further, the light source comprises a PCB board arranged on the side wall of the accommodating cavity along the vertical direction and a plurality of LED chips linearly arranged on the PCB board; or, the light source comprises a light guide rod type linear light source arranged along the vertical direction; or, the light receiving part further comprises a substrate and a light sensing piece for sensing the detection light converged by the lens, and the light sensing piece is arranged on the substrate.

By applying the technical scheme of the invention, the light splitting part which can divide the detection light beam into the reflection light and the transmission light is arranged on one side of the light source, and the reflection light can vertically irradiate into the object to be scanned, so that the incident angle between the reflection light which irradiates into the object to be scanned and the object to be scanned is zero, and the reflection light can be reflected by the object to be scanned to vertically irradiate into the lens based on the reflection principle, therefore, on one hand, the reflection light can directly irradiate the root of the convex part of the object to be scanned with the uneven surface, and the reflection light can be vertically reflected into the lens, thereby avoiding the problem that the concave and convex surface is shaded because the convex part blocks the reflection light, further leading the contact type image sensor to read the information of the root of the convex part of the object to be scanned, on the other hand, the reflection light can vertically irradiate into the point of the object to be scanned corresponding to the lens and vertically irradiate into the lens after being reflected, therefore, the phenomenon of glare on the smooth surface can be avoided, and the contact type image sensor can read the information of the area of the object to be scanned, which corresponds to the lens. Therefore, the embodiment of the invention can accurately read the information of the object to be scanned, that is, the embodiment of the invention solves the problem that the contact image sensor in the prior art is easy to read the local information of the object to be scanned when the contact image sensor scans the object to be scanned with a smooth surface or an uneven surface.

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 structural diagram of a first embodiment of a contact image sensor according to the present invention (in which an object to be scanned has a concave-convex surface);

FIG. 2 shows a schematic view of the contact image sensor of FIG. 1 (in which the object to be scanned has a smooth surface);

FIG. 3 is a schematic structural diagram of a second embodiment of a contact image sensor according to the present invention;

FIG. 4 is a schematic structural diagram of a third embodiment of a contact image sensor according to the present invention;

FIG. 5 shows a schematic structural diagram of a fourth embodiment of a contact image sensor of the present invention;

FIG. 6 shows a schematic structural diagram of a fifth embodiment of a contact image sensor of the present invention;

FIG. 7 shows a schematic structural diagram of a sixth embodiment of a contact image sensor of the present invention; and

fig. 8 is a schematic structural diagram showing a seventh embodiment of the contact image sensor of the present invention.

Wherein the figures include the following reference numerals:

1. a support frame; 2. a light source; 3. a light splitting part; 4. a light-transmitting plate; 5. a photosensitive member; 6. a substrate; 7. a lens; 8. an object to be scanned; 801. a convex portion; 9. a diffuser plate; 10. a light-condensing section; 11. a light absorbing portion; 12. a frame; 201. a PCB board; 202. an LED chip; 203. a reflection pattern; 204. a housing; 205. a light guide rod; 207. a light reflecting section.

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.

It should be noted that, in the embodiment of the present invention, the surface of the light splitting sheet is specially processed, and is generally formed by cross vacuum coating of silicon dioxide and titanium pentoxide, the silicon dioxide can effectively improve the transmittance of light, the titanium pentoxide has a very high refractive index, therefore, after vacuum coating is performed by using the two materials, an optical film in which the titanium pentoxide and the silicon dioxide exist simultaneously is formed on the surface of the glass, so that, when the probe beam emitted by the light source 2 irradiates the surface of the light splitting sheet, a part of the probe beam is specularly reflected by irradiating the surface of the titanium pentoxide with a high refractive index, that is, the reflected light od in fig. 1; the other part of the probe beam directly penetrates the spectroscopic plate due to the irradiation on the surface of the silica having a smaller refractive index and irradiates the inner wall surface of the accommodating cavity opposite to the light source 2, i.e., the transmitted light oe in fig. 1.

Implement one

As shown in fig. 1 and 2, an embodiment of the present invention provides a contact image sensor. The contact image sensor includes a frame 12, a light source 2, a spectroscopic part 3, and a light receiving part. Wherein the frame 12 has a receiving cavity; the light source 2 is positioned in the accommodating cavity, and the light source 2 is used for emitting a detection light beam; the light splitting part 3 is positioned in the accommodating cavity, the light splitting part 3 is positioned on one side of the light source 2, and the light splitting part 3 is used for splitting the detection light beam emitted by the light source 2 into reflection light rays and transmission light rays; the light receiving part comprises a lens 7 which is positioned in the accommodating cavity and used for converging light, and based on the reflection principle, the reflected light vertically enters the object to be scanned and vertically enters the lens 7 after being reflected by the object to be scanned 8.

In the above technical solution, the light splitting part 3 capable of splitting the detection light beam into the reflected light beam and the transmitted light beam is disposed on one side of the light source 2, and the reflected light beam can vertically enter the object 8 to be scanned, so that the incident angle between the reflected light beam entering the object 8 to be scanned and the object 8 to be scanned is zero, and the reflected light beam can be reflected by the object 8 to be scanned and vertically enter the lens 7 based on the reflection principle, so that, on one hand, the reflected light beam can directly irradiate the root b of the convex part 801 of the object 8 to be scanned having the uneven surface in fig. 1, and the reflected light beam is vertically reflected into the lens 7, thereby avoiding the problem of shadow appearing on the uneven surface due to the blocking of the reflected light beam by the convex part 801, and further enabling the contact image sensor to accurately read the information at the root b of the convex part 801 of the object 8 to be scanned, and on the other hand, the reflected light beam can vertically enter the point b of the object 8 to be scanned corresponding to the lens 7 in fig. 2 and be reflected The light is vertically emitted into the lens 7 after being emitted, so that the phenomenon of flare on a smooth surface can be avoided, and the contact image sensor can accurately read the information of the point b of the object to be scanned 8 corresponding to the lens 7. Therefore, the embodiment of the invention solves the problem that the contact image sensor in the prior art is easy to read the local information of the object to be scanned 8 when the object to be scanned 8 with a smooth surface or an uneven surface is scanned.

Further, the contact image sensor of the embodiment of the present invention can be applied to an object to be scanned having a concave-convex surface, an object to be scanned having a smooth surface, and a general object to be scanned, and thus, the application range of the contact image sensor can be increased.

Preferably, in the first embodiment of the present invention, the light splitting part 3 is a light splitting sheet.

In order to avoid that the transmitted light oe irradiated on the inner wall surface of the accommodating cavity is reflected and directly or indirectly enters the lens 7, thereby affecting the scanning effect of the contact image sensor, as shown in fig. 1 and 2, the contact image sensor according to the first embodiment of the present invention further includes a light absorbing portion 11 located on the inner wall surface of the accommodating cavity, the light absorbing portion 11 and the light source 2 are respectively located on both sides of the light splitting portion 3, and the transmitted light is absorbed by the light absorbing portion 11.

Through the arrangement, all or most of the transmission light rays oe which penetrate through the light splitting part 3 can be absorbed, so that the transmission light rays oe are prevented from being emitted by the inner wall surface of the accommodating cavity to influence the scanning effect of the contact type image sensor.

Preferably, in the first embodiment of the present invention, all the inner wall surface of the accommodating chamber or a part of the inner wall surface of the accommodating chamber corresponding to the transmitted light oe may be set to be black, that is, the light absorbing part 11 is a black wall surface, so that the transmitted light oe may be absorbed.

As shown in fig. 1 and fig. 2, in the first embodiment of the present invention, an included angle a is formed between the probe light beam emitted from the light source 2 and the incident surface of the spectroscopic unit 3, and the included angle a satisfies: a is more than or equal to 10 degrees and less than or equal to 80 degrees, so that the reflected light beams from the light splitting part 3 in the detection light beams vertically enter the object to be scanned 8.

Through the arrangement, the detection light beam co can be divided into the reflected light beam od and the transmitted light beam oe through the light splitting part 3, the reflected light beam od is vertically emitted into the object to be scanned 8, the reflected light beam which is vertically emitted into the object to be scanned 8 can also be vertically emitted into the lens 7, and therefore the contact type image sensor can accurately read all information of the object to be scanned 8.

As shown in fig. 1 and 2, in the first embodiment of the present invention, the probe beam is perpendicular to the optical axis of the lens 7, and the included angle a is 45 °.

Through the arrangement, a part of the probe light beam co enters the spectroscopic part 3 at an incident angle of 45 degrees to be subjected to specular reflection and exits at a reflection angle of 45 degrees, so that the reflected light beam od is perpendicular to the probe light beam co, i.e. the reflected light beam od is parallel to the optical axis of the lens 7, so that the reflected light beam od irradiates the object 8 to be scanned along the optical axis direction of the lens 7, and then the reflected light beam od is reflected on the surface of the object 8 to be scanned and then vertically enters the lens 7, so that the contact image sensor can accurately read all information of the object 8 to be scanned.

Specifically, in the first embodiment of the present invention, since the reflected light od is perpendicularly irradiated on the object 8 to be scanned, the light which can be irradiated on the root b of the convex portion 801 in fig. 1, and the light irradiated on b is reflected by the object 8 to be scanned, a part of the light ao which is parallel or approximately parallel to the optical axis of the lens 7 is irradiated on the surface of the spectroscopic unit 3, and also, due to the principle of spectroscopy by the spectroscopic unit 3, a part of the light ao is specularly reflected (i.e., the light oc) on the surface of the spectroscopic unit 3, and is absorbed or reflected on the side where the light source 2 is irradiated. And another part of the light ray ao passes through the light splitting part 3 (i.e. the beam of) and enters the lens 7.

As shown in fig. 1 and 2, in the first embodiment of the present invention, the light source 2 includes a PCB board 201 disposed on a sidewall of the accommodating chamber in a vertical direction, and a plurality of LED chips 202 linearly arranged on the PCB board 201.

Through the arrangement, the light source 2 can emit a plurality of detection light beams which are vertical to the optical axis of the lens 7, so that the brightness of the light source 2 can be improved, the light intensity of the light source 2 can be increased, and a scanned image has enough brightness to meet the use requirement of the scanned image.

Preferably, in the first embodiment of the present invention, the LED chip 202 may be light of any wavelength band.

Preferably, in the first embodiment of the present invention, the plurality of LED chips 202 are linearly arranged along the length direction of the inner wall surface of the accommodating cavity, the arrangement direction of the plurality of LED chips 202 is parallel to the lens 7, and the probe light beams emitted by the LED chips are perpendicular to the optical axis of the lens 7.

As shown in fig. 1 and fig. 2, in the first embodiment of the present invention, the frame 12 includes a supporting frame 1 and a light-transmitting plate 4 for passing the detection light, the light-transmitting plate 4 and the supporting frame 1 enclose a containing cavity, and the light source 2 and the spectroscopic unit 3 are located above the lens 7.

Through the arrangement, the light-transmitting plate 4 and the support frame 1 are enclosed to form the accommodating cavity, so that dust or moisture can be prevented from being attached to the light source 2, and the image quality of a scanned image can be improved.

Specifically, in the first embodiment of the present invention, the probe beam co irradiates on the light splitting part 3 in parallel with the transparent plate 4, and forms the reflected light od after being reflected by the light splitting part 3 to be emitted in the direction perpendicular to the transparent plate 4, and vertically irradiates on the object 8 to be scanned.

Preferably, in the first embodiment of the present invention, the frame 12 is made of plastic or metal.

Preferably, in the first embodiment of the present invention, the frame 12 may be a split-type structure or an integrally formed structure.

Preferably, in the first embodiment of the present invention, the light-transmitting plate 4 may be made of glass or transparent plastic.

As shown in fig. 1 and 2, in the first embodiment of the present invention, the light receiving portion further includes a substrate 6 and a light sensing member 5 for sensing the detection light condensed by the lens 7, and the light sensing member 5 is disposed on the substrate 6. The substrate 6 may be a PCB.

With the above arrangement, the probe beam converged by the lens 7 can be directly irradiated on the photosensitive member 5, thereby converting an optical signal reflected by the object 8 to be scanned into an electronic signal.

As shown in fig. 1 and 2, in the embodiment of the present invention, the light source 2, the light splitting part 3 and the light receiving part are located on the same side of the object 8 to be scanned.

With the above arrangement, one side of the object 8 to be scanned can be scanned, and an electronic image is formed at the light receiving portion.

Example two

The light source 2 adopted in the first embodiment of the present invention is a linear array light source composed of a plurality of LED chip arrays, because two adjacent LED chips are spaced apart from each other, and the larger the distance is, the fewer the number of LED chips in the light source 2 in a limited space is, the lower the brightness of the light source 2 is, thus, although the cost of the contact image sensor can be reduced, due to the high reflectivity and transmittance of the beam splitter, the diffuse reflection is less, and the interval arrangement of the plurality of LED chips easily causes uneven brightness of the light source 2, thereby causing uneven brightness of the scanned image.

In order to solve the problem of uneven imaging brightness caused by the light source 2, as shown in fig. 3, a difference between the second embodiment of the present invention and the first embodiment is that the contact image sensor of the second embodiment of the present invention further includes a scattering plate 9 for scattering the probe beam, the light source 2, the scattering plate 9, and the spectroscopic unit 3 are sequentially disposed along the optical path, and the scattering plate 9 is located between the light source 2 and the spectroscopic unit 3.

Among the above-mentioned technical scheme, increase the diffuser plate 9 between light source 2 and spectroscopic part 3, the light that light source 2 sent gets into the diffuser plate 9 after, takes place to emit out the diffuser plate 9 after the diffuse reflection, shines on spectroscopic part 3 to the light that makes light source 2 send is more even, thereby eliminates and makes light source 2 produce the uneven problem of luminance because of having certain distance between a plurality of LED chips, and then eliminates the alternate stripe of light and shade that the crest trough of LED array light source caused.

Other structures of the contact image sensor in the second embodiment of the present invention are the same as those in the first embodiment, and are not described herein again.

EXAMPLE III

As shown in fig. 4, a third embodiment of the present invention is different from the first embodiment in that the contact image sensor in the third embodiment of the present invention further includes a light-condensing portion 10 for condensing the probe beam, the light source 2, the light-condensing portion 10, and the light-splitting portion 3 are sequentially disposed along the optical path, and the light-condensing portion 10 is located between the light source 2 and the light-splitting portion 3.

In the above technical solution, the light condensing unit 10 is added between the light source 2 and the light splitting unit 3, so that the detection light beams can be converged, thereby improving the utilization rate of the light source 2 and improving the image quality of the scanned image.

Preferably, in the third embodiment of the present invention, the light-condensing portion 10 is a circular or semicircular or other linear convex lens, and is made of a transparent material, for example: and optically transparent materials such as glass, PMMA (polymethyl methacrylate), and PC (polycarbonate).

Preferably, in the third embodiment of the present invention, if the reflectance and transmittance of the spectroscopic part 3 are both 50%, other losses of the light during transmission are ignored. Thus, after the probe beam emitted from the light source 2 is split twice by the splitting unit 3, theoretically, the intensity of the light reaching the lens 7 is only one fourth of the original intensity, and if other losses are added, the intensity is much less. On the other hand, if the number of the LED chips 202 is increased, the cost of the contact image sensor is increased, and on the other hand, the large number of LED chips have a large heat value, so that a heat dissipation device needs to be added, which not only complicates the structure, but also reduces the lifetime of the light source 2. Therefore, in the present embodiment, the utilization rate of the light source 2 can be improved by increasing the light condensing unit 10, which is a principle of condensing light by using a linear convex lens, and the image quality of a scanned image can be improved even when a small number of LED chips 202 are provided.

Of course, the diffusion plate 9 may be added between the condensing unit 10 and the spectroscopic unit 3.

Other structures of the contact image sensor in the third embodiment of the present invention are the same as those in the first embodiment, and are not described herein again.

Example four

As shown in fig. 5, the fourth embodiment of the present invention is different from the first embodiment in the specific structure of the light source 2. Specifically, in the fourth embodiment, the light source 2 includes a light guide rod type linear light source arranged in the vertical direction.

Among the above-mentioned technical scheme, because the probe beam of the linear light source output of leaded light stick formula has better continuity in the length direction of leaded light stick, consequently, can avoid the uneven problem of light and shade to appear in the image of scanning, like this, this embodiment is four just also need not increase structures such as diffuser plate 9, can reduce contact image sensor's cost, simplifies its structure.

Specifically, in the fourth embodiment of the present invention, the light guide rod type linear light source includes a PCB 201, a plurality of LED chips 202 disposed on the PCB 201, a light guide rod 205 located at one side of the LED chips 202, a reflective pattern 203, and a housing 204 located at the periphery of the light guide rod 205.

Preferably, in the fourth embodiment of the present invention, the LED chip 202 may be light of any wavelength band, or may be a combination of various lights.

Other structures of the contact image sensor in the fourth embodiment of the present invention are the same as those in the first embodiment, and are not described herein again.

EXAMPLE five

As shown in fig. 6, a fifth embodiment of the present invention is different from the first embodiment in the specific structure of the frame 12. Specifically, in the fifth embodiment of the present invention, the frame 12 includes two support frames 1 and a plurality of light-transmitting plates 4 corresponding to the two support frames 1, the light source 2 and the light splitting part 3 are both located in one support frame 1 of the two support frames 1, and the light receiving part is located in the other support frame 1 of the two support frames 1.

Through the setting, the light source 2 and the light splitting part 3 can be separated from the light receiving part, so that an independent light splitting light source system is formed, the relative distance between the light source 2 and the light receiving part can be freely adjusted, and the use is convenient.

Preferably, in the fifth embodiment of the present invention, two transparent plates 4 are disposed on the supporting frame 1 provided with the light source 2, and the two transparent plates 4 are respectively located at the upper side and the lower side of the supporting frame 1 in fig. 6.

Specifically, in the fifth embodiment of the present invention, when the supporting frame 1 provided with the light source 2 is installed, it is ensured that the reflected light od and the optical axis nf of the lens 7 substantially coincide, so that the scanning effect can be improved, and the higher the coincidence ratio is, the better the scanning effect is.

Other structures of the contact image sensor in the fifth embodiment of the present invention are the same as those of the first embodiment, and are not described herein again.

EXAMPLE six

As shown in fig. 7, the sixth embodiment of the present invention is different from the fifth embodiment in the relative positions of the two support frames 1 and the addition of the light reflecting portion 207. Specifically, the two support frames 1 are located on opposite sides of the object to be scanned 8, the support frame 1 provided with the light source 2 has an opening, the opening is provided with a light-transmitting plate 4, the contact image sensor further includes a light-reflecting portion 207, the reflected light and the transmitted light are reflected by the light-reflecting portion 207, then pass through the light-transmitting plate 4 and enter the object to be scanned, the light-reflecting portion 207 and the light source 2 are located on opposite sides of the light-splitting portion 3, or the light-reflecting portion 207 and the light-transmitting plate 4 are located on opposite sides of the light-splitting portion 3.

Through the above arrangement, the spectroscopic light source system in the fifth embodiment can be used as a transmission light source, and thus, after the detection light beam is dispersed by the spectroscopic part 3, the reflected light beam in fig. 7 irradiates the object 8 to be scanned at a vertical or approximately vertical angle, so that when the external dimension of the object 8 to be scanned is measured as the transmission light source, the scanned image boundary can be clearer, thereby avoiding the influence on the scanning precision due to the shadow generated when the object 8 to be scanned is scanned by angular light, and further improving the measurement precision of the external dimension.

Specifically, the contact image sensor according to the sixth embodiment of the present invention includes two light reflecting portions 207, so that, after the detection light beam emitted from the light source 2 is split by the light splitting portion 3, the reflected light beam irradiates the light reflecting portion 207 located on the upper side of the support frame 1 in fig. 7, and is reflected by the light reflecting portion 207, passes through the light splitting portion 3, and irradiates the object to be scanned 8, while the transmitted light beam perpendicularly irradiates the light reflecting portion 207 located on the right side of the support frame 1 in fig. 7, is reflected by the light reflecting portion 207 to the light splitting portion 3, and is reflected by the light splitting portion 3, and then perpendicularly irradiates the object to be scanned 8, thereby improving the utilization rate of light.

Preferably, in the sixth embodiment of the present invention, the reflected light ray om of the spectroscopic light source system and the optical axis nf of the lens 7 should be overlapped as much as possible, and the higher the coincidence ratio is, the better the scanning effect is.

The other structures of the contact image sensor in the sixth embodiment of the present invention are the same as those in the fifth embodiment, and are not described herein again.

EXAMPLE seven

As shown in fig. 8, the seventh embodiment of the present invention is different from the sixth embodiment in that the two support frames 1 of the seventh embodiment are located on the same side of the object 8 to be scanned, the two support frames 1 are arranged along the left-right direction, the light splitting part 3 extends along the horizontal direction, and a predetermined acute angle is formed between the reflected light beams passing through the light splitting part and the optical axis of the lens 7.

Among the above-mentioned technical scheme, through the better directionality of the light that utilizes the beam split light source system, can scan waiting to scan thing 8 with preset angle to obtain specific scanning effect, for example unsmooth sense scanning, dust scanning, footprint scanning etc. the light that has good directionality can reduce the influence of stray light, thereby obtains better scanning effect.

Preferably, the supporting frame 1 provided with the light source 2 according to the seventh embodiment of the present invention includes a light-transmitting plate 4 for transmitting light.

Specifically, in the seventh embodiment of the present invention, after the probe light beam pk emitted by the light source 2 is split by the splitting unit 3, the transmission light kq vertically irradiates one of the light reflecting units 207, and is then vertically reflected back to the splitting unit 3, after the splitting unit 3 splits, the light ks vertically irradiates another light reflecting unit 207, and is then vertically reflected back to the splitting unit 3 by another light reflecting unit 207, and after the splitting unit 3 splits, a part of the light passes through the splitting unit 3 and coincides with the light od, so that the utilization rate of the light can be improved.

The other structures of the contact image sensor in the seventh embodiment of the present invention are the same as those in the sixth embodiment, and are not described herein again.

In the spectral light source systems of the fifth, sixth, and seventh embodiments, the diffusion plate 9, the light-collecting unit 10, the light guide rod type linear light source, and the like, which are provided in the other embodiments, may be provided.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the light splitting part capable of splitting the detection light beam into the reflection light and the transmission light is arranged on one side of the light source, and the reflection light can vertically irradiate into the object to be scanned, so that the incident angle between the reflection light irradiating into the object to be scanned and the object to be scanned is zero, and the reflection light can be reflected by the object to be scanned and vertically irradiate into the lens based on the reflection principle, so that on one hand, the reflection light can directly irradiate on the root of the convex part of the object to be scanned with the uneven surface and vertically reflect the reflection light into the lens, thereby avoiding the problem that the shadow appears on the uneven surface due to the fact that the convex part blocks the reflection light, further enabling the contact type image sensor to read the information of the root of the convex part of the object to be scanned, on the other hand, the reflection light can vertically irradiate into the point of the object to be scanned corresponding to the lens and vertically irradiate into the lens after being reflected, therefore, the phenomenon of glare on the smooth surface can be avoided, and the contact type image sensor can read the information of the point of the object to be scanned corresponding to the lens. Therefore, the embodiment of the invention solves the problem that the contact image sensor in the prior art is easy to read the local information of the object to be scanned when the object to be scanned with a smooth surface or an uneven surface is scanned.

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

Claims

1. A contact image sensor, comprising:

a frame (12) having a receiving cavity;

a light source (2) located within the containment chamber, the light source (2) being for emitting a probe beam;

the light splitting part (3) is positioned in the accommodating cavity, the light splitting part (3) is positioned on one side of the light source (2), and the light splitting part (3) is used for splitting a detection light beam emitted by the light source (2) into a reflected light ray and a transmitted light ray;

and the light receiving part comprises a lens (7) which is positioned in the accommodating cavity and used for converging light rays, and on the basis of the reflection principle, the reflected light rays vertically enter the object to be scanned and vertically enter the lens (7) after being reflected by the object to be scanned (8).

2. The contact image sensor according to claim 1, further comprising a light absorbing portion (11) located on an inner wall surface of the accommodating chamber, the light absorbing portion (11) and the light source (2) being located on both sides of the light splitting portion (3), respectively, the transmitted light being absorbed by the light absorbing portion (11).

3. The contact image sensor according to claim 1, wherein the detecting light beam emitted from the light source (2) and the incident surface of the light splitting part (3) form an included angle a, and the included angle a satisfies: a is more than or equal to 10 degrees and less than or equal to 80 degrees, so that the reflected light beams split by the light splitting part (3) in the detection light beams are vertically incident to the object to be scanned (8).

4. A contact image sensor according to claim 3, characterized in that the probe beam is perpendicular to the optical axis of the lens (7) and the angle a is 45 °.

5. The contact image sensor according to any one of claims 1 to 4, further comprising a scattering plate (9) for scattering the probe light beam, wherein the light source (2), the scattering plate (9), and the spectroscopic portion (3) are sequentially disposed along a light path, and the scattering plate (9) is located between the light source (2) and the spectroscopic portion (3).

6. The contact image sensor according to any one of claims 1 to 4, further comprising a light-condensing portion (10) for condensing the probe light beam, wherein the light source (2), the light-condensing portion (10), and the light-splitting portion (3) are arranged in this order along an optical path, and the light-condensing portion (10) is located between the light source (2) and the light-splitting portion (3).

7. The contact image sensor according to any one of claims 1 to 4, wherein the frame (12) comprises a support frame (1) and a light-transmitting plate (4) for passing the detection light, the light-transmitting plate (4) and the support frame (1) enclosing the accommodating chamber, and the light source (2) and the light-splitting part (3) are located above the lens (7).

8. The contact image sensor according to claim 7, wherein the frame (12) comprises two support frames (1) and a plurality of light-transmitting plates (4) corresponding to the two support frames (1), the light source (2) and the light-splitting part (3) are both located in one of the two support frames (1), and the light-receiving part is located in the other of the two support frames (1).

9. The contact image sensor according to claim 8, wherein the two support frames (1) are located at opposite sides of the object (8) to be scanned, the support frame (1) provided with the light source (2) has an opening, the opening is provided with the transparent plate (4), the contact image sensor further comprises a light reflecting portion (207), the reflected light and the transmitted light are reflected by the light reflecting portion (207) and then pass through the transparent plate (4) and enter the object to be scanned, the light reflecting portion (207) and the light source (2) are located at opposite sides of the light splitting portion (3), or the light reflecting portion (207) and the transparent plate (4) are located at opposite sides of the light splitting portion (3).

10. The contact image sensor according to any one of claims 1 to 4, wherein the light source (2), the spectroscopic unit (3), and the light receiving unit are located on the same side of the object (8) to be scanned.

11. The contact image sensor according to any one of claims 1 to 4, wherein the light source (2) comprises a PCB board (201) provided to a sidewall of the receiving cavity in a vertical direction and a plurality of LED chips (202) linearly arranged on the PCB board (201); or the light source (2) comprises a light guide rod type linear light source arranged along the vertical direction; or, the light receiving part further comprises a substrate (6) and a light sensing piece (5) for sensing the detection light converged by the lens (7), and the light sensing piece (5) is arranged on the substrate (6).