CN212871099U - Ultra-thin linear array image sensor and displacement detection device - Google Patents
Ultra-thin linear array image sensor and displacement detection device Download PDFInfo
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- CN212871099U CN212871099U CN202021595772.1U CN202021595772U CN212871099U CN 212871099 U CN212871099 U CN 212871099U CN 202021595772 U CN202021595772 U CN 202021595772U CN 212871099 U CN212871099 U CN 212871099U
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Abstract
An ultra-thin linear array image sensor comprises a circuit board, a linear array image sensing chip, a self-focusing lens array and a light source, wherein the linear array image sensing chip and the light source are respectively attached to two sides of an installation surface of the circuit board; an object plane reflector or an object multi-surface plane reflector is arranged in an object light path of the self-focusing lens array, and the self-focusing lens array is suitable for application in narrow space perpendicular to a scanning piece. Based on the displacement detection device of the ultrathin linear array image sensor, the displacement detection device such as a small or miniature grating ruler, a micrometer or a rotary encoder can be formed.
Description
Technical Field
The utility model belongs to the image sensor field relates to an ultra-thin type linear array image sensor is used for displacement measurement's displacement detection device.
Background
The existing linear array image sensor comprises a circuit board, a linear array image sensing chip and a self-focusing lens array, wherein the linear array image sensing chip is arranged on the circuit board, the self-focusing lens array is arranged between the image sensing chip and an object to be scanned, the optical axis of the self-focusing lens array is vertical to the circuit board, the height (y) of the self-focusing lens array is determined by the sum of the object distance, the image distance and the lens height and is generally larger than 10.5mm, and the thickness (z) of the self-focusing lens array is determined by the sum of the width of the circuit board and the thickness of a fixed shell thereof and is generally. At present, many application places require that the smaller the space size of the linear array image sensor perpendicular to or parallel to the scanning direction is, the better the linear array image sensor is, for this reason, the technical scheme of the publication number CN109462713A, a plane reflector is arranged between the scanned object and the self-focusing lens array, the light entering direction of the scanned object is changed, the space size perpendicular to the scanning element is changed from 10.5mm to 6mm, and the linear array image sensor is a direction-changing space size compression mode; the technical scheme of the publication No. CN207753772U is that plane reflectors are arranged at two ends of a lens, and the two technical schemes are also a direction-changing space size compression mode, and three problems need to be solved, wherein firstly, a circuit board is too narrow, an image signal is originally sensitive and is very easy to be interfered, a linear array image sensing chip needs to be provided with decoupling elements nearby, some circuit boards also need to be matched with impedance circuits, and in addition, the driving signal, the image signal and a power supply are electrically connected, so that the decoupling elements and the matched impedance circuits are often abandoned on the narrow circuit board, and when the working frequency exceeds 4MHz, the image signal is obviously deteriorated and cannot meet practical requirements; the light source and the circuit board are arranged independently and often need to be electrically connected, so that the processing technology is complex, and the space size compression is limited; thirdly, the existing linear array image sensor does not have the function of simultaneously working a plurality of scanning lines, and cannot meet the requirement of multi-track scanning application, for example, when multi-track displacement coding is used for displacement measurement, the image sensor with a plurality of scanning lines is required to be used as an acquisition unit of displacement information.
The linear array image sensor can also be used in the displacement detection field, and the technical scheme of the publication No. CN111023977A adopts the existing image sensor as a displacement information acquisition unit, which is too large and limited in volume, if the linear array image sensor is used for a grating ruler, the thinnest thickness of the linear array image sensor can only be 20mm, and a certain difference exists between the thickness of the linear array image sensor and the thickness of the ultrathin grating ruler which is less than 16 mm; the existing linear array image sensor is also difficult to miniaturize when being used for a rotary encoder.
Disclosure of Invention
In order to solve the problems, according to the technical scheme provided by the ultra-thin linear array image sensor, a linear array image sensing chip and a reflection light source are arranged on a circuit board, and a self-focusing lens array, an image plane reflector, an object plane reflector or an object multi-surface plane reflector, a light source reflector and the like are arranged right above the circuit board, so that the area of the circuit board is enlarged, and the problem that the image quality is reduced due to the fact that the circuit board is narrow and small because the thickness of the existing image sensor is reduced is solved; the problems of complex process and limited space size compression of the sensor caused by the separate arrangement of the circuit board and the light source are solved, so that the ultrathin linear array image sensor has good image quality in the working range from low frequency 100KHz to high frequency 10MHz, and has the advantages of simple process, more space size compression and wider application range; the arrangement of the object multi-surface plane reflector meets the application requirement of multi-track scanning.
According to the technical scheme provided by the linear displacement detection device, the ultrathin linear array image sensor is used as the displacement information acquisition unit, so that the purpose of miniaturization and even miniaturization of the linear displacement detection device is achieved, and the linear displacement detection device is expected to be widely applied.
According to the technical scheme provided by the rotary encoder, the ultrathin linear array image sensor is used as the displacement information acquisition unit, so that the purpose of miniaturization and even miniaturization of the rotary encoder is achieved, and the rotary encoder is expected to be widely applied.
The specific technical scheme provided by the application is as follows:
an ultra-thin linear array image sensor comprises a circuit board, a linear array image sensing chip and a self-focusing lens array; e and F are respectively an object point and a corresponding image point on the optical axis of the self-focusing lens array, A and B are respectively intersection points of EF and the object end face and the image end face of the self-focusing lens array, the mounting surface of the circuit board is parallel to the optical axis face of the self-focusing lens array, and the mounting surface on one side close to the F point is provided with the linear array image sensing chip; an image plane reflector is arranged in a BF light path, a photosensitive central line OF the linear array image sensing chip, a connecting line OF optical axis central points OF the self-focusing lens array and a reflecting surface OF the image plane reflector are mutually parallel, a beam OF light is emitted along BF, and a reflected light OF ' is formed at an O point OF the reflecting surface OF the image plane reflector, the linear array image sensing chip, the self-focusing lens array and the image plane reflector are positioned at preset spatial positions, so that F ' is just positioned on the photosensitive central line OF the linear array image sensing chip, OF is equal to OF ', and more than half OF the area OF the orthographic projection OF the self-focusing lens array on the mounting surface is positioned within the range OF the mounting surface.
As a further improvement of the scheme, a reflecting light source is arranged on the mounting surface on the side close to the point E.
As a further improvement of the scheme, the reflecting light source is a patch light-emitting diode or a light-emitting light guide strip.
As a further improvement of the scheme, an object plane reflector is arranged in an AE optical path, a reflecting surface of the object plane reflector is parallel to a connecting line of optical axis central points of the self-focusing lens array, a beam of light rays is emitted along AE, a reflected light ray PE ' far away from the mounting surface direction is formed at a point P of the reflecting surface of the object plane reflector, the object plane reflector is located at a preset spatial position, so that E ' falls on a scanned object, and E ' is an object point of the self-focusing lens array.
As a further improvement of the scheme, an object multi-surface plane mirror is arranged in an AE optical path, the object multi-surface plane mirror comprises at least two reflecting surfaces, all the reflecting surfaces of the object multi-surface plane mirror are arranged along the connecting line direction of the central points of the optical axes of the self-focusing lens array, all the reflecting surfaces of the object multi-surface plane mirror are parallel to the connecting line of the central points of the optical axes of the self-focusing lens array, and all the reflecting surfaces of the object multi-surface plane mirror are not parallel to each other; a 'is the intersection point of the other optical axis of the self-focusing lens array and the object end face, two light rays AP and A' P 'are emitted from the object end face along the optical axis of the self-focusing lens array, reflected light rays PE' and P 'E' in the direction away from the installation face are formed through the points P and P 'of two reflection faces of the object multi-face plane mirror, the object multi-face plane mirror is in a preset spatial position, so that E' and E 'fall on an object to be scanned, E' and E 'are two object points of the self-focusing lens array respectively, and E' are on two different scanning lines respectively.
As a further improvement of this solution, a light source reflector is disposed in a light path of the reflection light source, and the reflection light source and the light source reflector are located at preset spatial positions, so that a main light beam of the reflection light source is reflected to an object to be scanned by the light source reflector.
A linear displacement detection device comprises an image sensor, a signal processing unit and a scale, wherein the image sensor and the scale perform relative linear motion along a displacement detection direction, the signal processing unit drives the image sensor to scan the scale to obtain an image signal and process the image signal, and the relative displacement is obtained through calculation, and the image sensor is the ultrathin linear array image sensor.
A rotary encoder comprises an image sensor, a signal processing unit and a code cylinder, wherein the image sensor and the code cylinder make relative circular motion, the signal processing unit drives the image sensor to scan the code cylinder to obtain an image signal and process the image signal, and relative angular displacement is obtained through calculation.
Drawings
The attached drawings only show the structural schematic parts related to the invention and do not serve as design drawings:
FIG. 1 is a schematic structural diagram of an ultra-thin linear array image sensor;
FIG. 2 is a schematic structural diagram of an ultra-thin linear array image sensor with a reflective light source;
FIG. 3 is a schematic structural diagram of an ultra-thin linear array image sensor with an object plane reflective mirror;
FIG. 4 is a schematic structural diagram of an ultra-thin linear array image sensor with a reflective light source, a light source reflector and an object plane reflector;
FIG. 5 is a schematic structural diagram of an ultra-thin linear array image sensor with an object multi-surface plane mirror;
FIG. 6 is a schematic structural diagram of an ultra-thin linear array image sensor with a reflective light source, a light source reflector and an object multi-surface plane reflector;
FIG. 7 is a schematic diagram of the optical path of the self-focusing lens array and the object multi-facet mirror;
FIG. 8 is a schematic structural diagram of a linear displacement detecting device with a dual-track bar code scale and a dual-scan line image sensor;
FIG. 9 is a schematic structural view of a linear displacement detecting device with a single-track bar code scale and a single scan line image sensor;
FIG. 10 is a schematic structural view of a rotary encoder with an image sensor disposed inside a code cylinder;
fig. 11 is a schematic structural view of a rotary encoder in which an image sensor is disposed outside a code cylinder.
Example 1
An ultra-thin linear array image sensor is shown in fig. 1, and comprises a circuit board 10, a linear array image sensing chip 11 and a self-focusing lens array 12, wherein E and F are respectively an object point and a corresponding image point on an optical axis of the self-focusing lens array 12, a and B are respectively intersections of EF and an object end face and an image end face of the self-focusing lens array 12, the self-focusing lens array 12 is arranged right above an installation surface 101 of the circuit board 10, an optical axis face of the self-focusing lens array 12 is parallel to the installation surface 101, and more than half of the area of the orthographic projection of the self-focusing lens array 12 on the installation surface 101 falls within the range of the installation surface 101; the linear array image sensing chip 11 is mounted on the mounting surface 101 on the side close to the point F, an image plane mirror 13 is arranged in a BF light path, a photosensitive center line OF the linear array image sensing chip 11, a connection line OF an optical axis center point OF the self-focusing lens array 12 and a reflecting surface OF the image plane mirror 13 are parallel to each other, a beam OF light is emitted along BF, a reflected light OF 'is formed at a point O OF the reflecting surface OF the image plane mirror 13, the linear array image sensing chip 11, the self-focusing lens array 12 and the image plane mirror 13 are located at preset spatial positions, so that F' OF the reflected light OF 'falls on the photosensitive center line, and OF' is equal to OF.
The optical axis plane of the self-focusing lens array 12 refers to a plane where the optical axes of all the cylindrical self-focusing lenses in the same column are located; the optical axis center point connecting line of the self-focusing lens array 12 refers to a connecting line of center points of optical axes of all the cylindrical self-focusing lenses in the same column between the object end surface and the image end surface.
As a built-in reflection light source, a reflection light source 16 is mounted on the mounting surface 101 on the side close to point E, as shown in fig. 2.
In order to adapt to the application in the short space of the vertical scanning member, an object plane reflector 14 is arranged in the AE optical path of the self-focusing lens array 12, the reflecting surface of the object plane reflector 14 is parallel to the connecting line of the central points of the optical axes of the self-focusing lens array 12, one beam of light rays is emitted along AE, a reflected light ray PE 'in the direction away from the mounting surface 101 is formed at the point P of the reflecting surface of the object plane reflector 14, the object plane reflector 14 is in a preset spatial position, so that E' falls on the scanned object, and E 'is one object point of the self-focusing lens array 12, namely AE' = AE, as shown in fig. 3.
In order to adapt to the multi-scan line application, an object multi-plane mirror 15 is disposed in the AE optical path, as shown in fig. 5, the object multi-plane mirror 15 includes at least two reflecting surfaces, all the reflecting surfaces of the object multi-plane mirror 15 are arranged along the direction of the line connecting the optical axis central points of the self-focusing lens array 12, all the reflecting surfaces of the object multi-plane mirror 15 are parallel to the line connecting the optical axis central points of the self-focusing lens array 12, and all the reflecting surfaces of the object multi-plane mirror 15 are not parallel to each other; a ' is an intersection point of the other optical axis of the self-focusing lens array 12 and the object end surface, two light rays AP and a ' P ' are emitted from the object end surface along the optical axis, reflected light rays PE ' and P ' E ″ are formed at the points P and P ' of two of the reflecting surfaces of the object polygon mirror 15 away from the mounting surface 101, the object polygon mirror 15 is at a predetermined spatial position such that E ' and E ″ fall on the scanned object, E ' and E ″ are two object points of the self-focusing lens array 12, and E ' and E ″ are respectively on two different scanning lines, as shown in fig. 7.
In order to irradiate the main beam of the built-in reflection light source 16 to the scanned object, a light source reflector 17 is disposed in the optical path of the reflection light source 16, as shown in fig. 4 and 6.
In order to maximize the circuit board, more than half of the area of the respective orthographic projections of the above-described self-focusing lens array 12, image plane mirror 13, object plane mirror 14 or object multi-plane mirror 15 and light source mirror 17 on the mounting surface 101 falls within the range of the mounting surface 101.
The types of the reflective light source 16 include a light emitting diode and a light emitting guide strip, and the light emitting direction is a forward direction or a lateral direction.
The reflecting surface of the plane reflector comprises a metal coating surface, a reflecting coating surface and a metal grinding and polishing surface.
The ultra-thin linear array image sensor with only one scanning line is called a single scanning line image sensor, and the ultra-thin linear array image sensor with two scanning lines is called a double scanning line image sensor.
Example 2
A linear displacement detection device comprises an image sensor 21, a signal processing unit 22 and a scale 23, wherein the image sensor 21 and the scale 23 make relative linear motion along a displacement detection direction, the signal processing unit 22 drives the image sensor 21 to scan the scale 23 to obtain an image signal, and quantizes and calculates the image signal to obtain a relative displacement, and the image sensor 21 is the ultrathin linear array image sensor.
In order to improve the accuracy and quality of the linear displacement detecting device, the image sensing chip of the image sensor 21 is a single chip.
The scale 23 is a bar code scale disclosed in publication number CN111457846A or a code scale disclosed in publication number CN 111023977A.
When the scale 23 is a displacement code scale disclosed in publication number CN111023977A, the scanning line 211 of the image sensor 21 is parallel to two side lines of the displacement code scale; when the scale 23 is a bar code scale disclosed in publication No. CN111457846A, the scanning line 211 of the image sensor 21 is perpendicular to the space of the bar code scale, such as fig. 8 shows a linear displacement detection device of a dual-track bar code scale and a dual-scanning-line image sensor, and fig. 9 shows a linear displacement detection device of a single-track bar code scale and a single-scanning-line image sensor.
Example 3
A rotary encoder comprises an image sensor 31, a signal processing unit 32 and a code cylinder 33, wherein the image sensor 31 and the code cylinder 33 make relative circular motion, a scanning line 311 of the image sensor 31 is parallel to the axis of the code cylinder 33, the signal processing unit 32 drives the image sensor 31 to scan the code cylinder 33 to obtain an image signal, and the image signal is quantized and calculated to obtain a relative angular displacement, and the image sensor 31 is the ultra-thin linear array image sensor.
In order to improve the accuracy and quality of the rotary encoder, it is preferable that the image sensing chip of the image sensor 31 is a single chip.
Preferably, the image sensor 31 is provided inside the code cylinder 33 as a solid shaft rotary encoder, as shown in fig. 10; preferably, the image sensor 31 is disposed outside the code cylinder 33 as a hollow shaft rotary encoder, as shown in fig. 11.
The code cylinder 33 is a displacement code ruler which is connected with a displacement code in the technical scheme of the publication number CN111023977A and is manufactured on the cylindrical surface of the cylinder according to the circumferential direction.
The above embodiments are only three specific examples of the present application, and modifications obvious to those skilled in the art are all within the scope of the present claims.
Claims (8)
1. An ultrathin linear array image sensor comprises a circuit board (10), a linear array image sensing chip (11) and a self-focusing lens array (12); e and F are respectively an object point and a corresponding image point on the optical axis of the self-focusing lens array (12), A and B are respectively intersection points of EF and the object end surface and the image end surface of the self-focusing lens array (12), and the device is characterized in that the mounting surface (101) of the circuit board (10) is parallel to the optical axis surface of the self-focusing lens array (12), and the mounting surface (101) close to the F point is provided with the linear array image sensing chip (11); an image plane reflector (13) is arranged in a BF light path, a photosensitive central line OF the linear array image sensing chip (11), an optical axis central point connecting line OF the self-focusing lens array (12) and a reflecting surface OF the image plane reflector (13) are mutually parallel, a beam OF light is emitted along BF, a reflected light ray OF ' is formed at the O point OF the reflecting surface OF the image plane reflector (13), the linear array image sensing chip (11), the self-focusing lens array (12) and the image plane reflector (13) are positioned at preset spatial positions, so that F ' is just positioned on the photosensitive central line OF the linear array image sensing chip (11), OF is equal to OF ', and more than half OF the area OF the orthographic projection OF the self-focusing lens array (12) on the mounting surface (101) is positioned within the range OF the mounting surface (101).
2. The ultra-thin linear array image sensor as set forth in claim 1, wherein a reflective light source (16) is mounted on said mounting surface (101) on a side near point E.
3. The ultra-thin linear array image sensor according to claim 2, wherein the reflective light source (16) is a patch light emitting diode or a light emitting light guide strip.
4. The ultra-thin line array image sensor of any one of claims 1 to 3, wherein an object plane reflector (14) is arranged in an AE optical path, a reflecting surface of the object plane reflector (14) is parallel to a connecting line of optical axis center points of the self-focusing lens array (12), a beam of light rays is emitted along AE, a reflected light ray PE ' in a direction away from the installation surface (101) is formed through a point P of the reflecting surface of the object plane reflector (14), the object plane reflector (14) is in a preset spatial position, so that E ' falls on an object to be scanned, and E ' is an object point of the self-focusing lens array (12).
5. The ultra-thin type linear array image sensor according to any one of claims 1 to 3, wherein an object multi-plane mirror (15) is provided in an AE optical path, the object multi-plane mirror (15) includes at least two reflecting surfaces, all the reflecting surfaces of the object multi-plane mirror (15) are arranged in a direction of a line connecting optical axis center points of the self-focusing lens array (12), all the reflecting surfaces of the object multi-plane mirror (15) are parallel to a line connecting optical axis center points of the self-focusing lens array (12), and the reflecting surfaces of the object multi-plane mirror (15) are not parallel to each other; a ' is the intersection point of the other optical axis of the self-focusing lens array (12) and the object end face, two light rays AP and A ' P ' are emitted from the object end face along the optical axis of the self-focusing lens array (12), reflected light rays PE ' and P ' E in the direction away from the installation face (101) are formed through the points P and P ' of two reflection faces of the object multi-face plane mirror (15), the object multi-face plane mirror (15) is in a preset spatial position, so that E ' and E ' fall on an object to be scanned, E ' and E ' are two object points of the self-focusing lens array (12), and E ' are respectively on two different scanning lines.
6. The ultra-thin type linear array image sensor according to claim 2 or claim 3, an object plane reflector (14) is arranged in an AE optical path, the reflecting surface of the object plane reflector (14) is parallel to the connecting line of the central points of the optical axes of the self-focusing lens array (12), a beam of light rays is emitted along AE, a reflected light ray PE' in the direction far away from the mounting surface (101) is formed at the point P of the reflecting surface of the object plane reflector (14), the object plane reflector (14) is at a preset spatial position, so that E 'falls on the scanned object, and E' is an object point of the self-focusing lens array (12), a light source reflector (17) is arranged in the light path of the reflection light source (16), the reflection light source (16) and the light source reflector (17) are arranged at preset spatial positions, so that the main beam of the reflecting light source (16) is reflected to the scanned object by the light source reflecting mirror (17).
7. The ultra-thin type linear array image sensor according to claim 2 or 3, wherein an object multi-plane mirror (15) is provided in an AE optical path, the object multi-plane mirror (15) includes at least two reflecting surfaces, all the reflecting surfaces of the object multi-plane mirror (15) are arranged in a direction of a line connecting optical axis center points of the self-focusing lens array (12), all the reflecting surfaces of the object multi-plane mirror (15) are parallel to a line connecting optical axis center points of the self-focusing lens array (12), and the reflecting surfaces of the object multi-plane mirror (15) are not parallel to each other; a 'is the intersection point of the other optical axis of the self-focusing lens array (12) and the object end face, two light rays AP and A' P 'are emitted from the object end face along the optical axis of the self-focusing lens array (12), reflected light rays PE' and P 'E in the direction away from the installation face (101) are formed through the points P and P' of two reflection faces of the object multi-face plane reflector (15), the object multi-face plane reflector (15) is in a preset space position, so that E 'and E' fall on an object to be scanned, E 'and E' are two object points of the self-focusing lens array (12), respectively, E 'and E' are on two different scanning lines, a light source reflector (17) is arranged in the optical path of the reflection light source (16), and the reflection light source (16) and the light source reflector (17) are in preset space positions, so that the main beam of the reflecting light source (16) is reflected to the scanned object by the light source reflecting mirror (17).
8. A displacement detection device, comprising the ultra-thin type linear array image sensor according to any one of claims 1 to 7, a signal processing unit and a scale, wherein the ultra-thin type linear array image sensor and the scale move relatively along a displacement detection direction, and the signal processing unit drives the ultra-thin type linear array image sensor to scan the scale to obtain an image signal and process the image signal, and the relative displacement is obtained by calculation.
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