CN214315378U - Imaging module, photosensitive assembly and laser displacement sensor - Google Patents
Imaging module, photosensitive assembly and laser displacement sensor Download PDFInfo
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- CN214315378U CN214315378U CN202023196206.6U CN202023196206U CN214315378U CN 214315378 U CN214315378 U CN 214315378U CN 202023196206 U CN202023196206 U CN 202023196206U CN 214315378 U CN214315378 U CN 214315378U
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Abstract
The utility model discloses an imaging module, photosensitive assembly and laser displacement sensor. The imaging module comprises an imaging lens group and a narrow-band filter, and the narrow-band filter is arranged on the light emergent side of the imaging lens group and is vertical to the optical axis of the imaging lens group; the photosensitive component comprises a photosensitive element, a shell and an imaging module, the photosensitive element and the imaging module are mounted on the shell, a light path channel is arranged on the shell, the imaging module is positioned at the front end of the light path channel, and the photosensitive element is positioned at the tail end of the light path channel; the laser displacement sensor comprises a laser emitter and a photosensitive assembly, wherein the laser emitter is installed on the shell. The utility model discloses an imaging module, photosensitive assembly and laser displacement sensor can improve the transmissivity of signal light and reduce stray light's transmissivity.
Description
Technical Field
The utility model relates to a sensor technical field, in particular to formation of image module, photosensitive assembly and laser displacement sensor.
Background
The laser triangulation method measuring principle is a measuring principle widely applied in a laser displacement sensor, and the principle is that a laser transmitter emits visible red laser to the surface of a measured object through a lens, the laser reflected by the object passes through a receiving lens and is received by an internal linear array CCD, and a digital signal processor can calculate the distance between the laser displacement sensor and the measured object according to different distances and receiving angles and the known distance between the laser and a camera. The key point of the module is a narrow-band filter, which is used for enabling useful signal light to reach the linear array CCD through the receiving lens and filtering other stray light in the environment, so that the signal is stable and reliable.
At present, the narrow band filter is arranged in front of the CCD, the included angle between incident light and the narrow band filter is large, the change of the included angle is large, and useful signal light is filtered out easily. In the related art, although the transmittance of the signal light can be increased by a customized narrow-band filter, the cost is high and the versatility is low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an imaging module can improve the transmissivity of signal light and reduce stray light's transmissivity.
The utility model discloses still provide a photosensitive assembly who has above-mentioned formation of image module.
The utility model discloses still provide a laser displacement sensor who has above-mentioned photosensitive assembly.
According to the utility model discloses an imaging module of first aspect embodiment, include: an imaging lens group; the narrow band filter is arranged on the light emergent side of the imaging lens group and is vertical to the optical axis of the imaging lens group.
According to the utility model discloses imaging module has following beneficial effect at least: the imaging lens group receives reflected light, the reflected light reaches the narrow-band filter after passing through the imaging lens group, signal light in the reflected light can pass through the narrow-band filter, and stray light in the reflected light is reflected or absorbed by the narrow-band filter, so that the transmittance of the signal light is improved, the transmittance of the stray light is reduced, a customized narrow-band filter is not needed, the cost is reduced, and the universality is improved.
According to some embodiments of the present invention, the imaging lens group comprises an aspheric lens and a plurality of spherical lenses, the aspheric lens is located behind the spherical lens for imaging.
According to the utility model discloses a photosensitive assembly of second aspect embodiment, including photosensitive element, casing and first aspect embodiment the formation of image module, photosensitive element with the formation of image module is installed on the casing, be provided with the light path passageway on the casing, the formation of image module is located the front end of light path passageway, photosensitive element is located the end of light path passageway.
According to the utility model discloses photosensitive assembly has following beneficial effect at least: the imaging module reflects or absorbs stray light in the reflected light, the transmittance of the signal light is improved, and the signal light reaches the photosensitive element through the light path channel, so that the photosensitive element receives more signal light, the received stray light is reduced, and the photosensitive accuracy is improved.
According to some embodiments of the utility model, still be provided with the draw-in groove on the casing, photosensitive element with the formation of image module passes through draw-in groove fixed mounting be in on the casing to it is fixed.
According to some embodiments of the utility model, still be provided with the draw-in groove on the casing and paste the layer, imaging lens group with photosensitive element passes through draw-in groove fixed mounting is in on the casing, the narrowband optical filter passes through paste layer fixed mounting in on the casing to adjust the position of narrowband optical filter when fixed and being convenient for assemble.
According to some embodiments of the present invention, the photosensitive element includes a linear array CCD or an area array CCD, so as to convert the optical signal into a digital signal.
According to the utility model discloses a laser displacement sensor of third aspect embodiment, including laser emitter and second aspect embodiment photosensitive assembly, laser emitter installs on the casing.
According to the utility model discloses laser displacement sensor has following beneficial effect at least: the laser emitter fixed on the shell emits laser, when the laser reaches the surface of an object to be detected, reflected light is generated, the photosensitive assembly receives part of the reflected light, and reflects or absorbs stray light in the reflected light, so that the transmittance of signal light in the reflected light is improved, the transmittance of the stray light is reduced, and the photosensitive accuracy is improved.
According to some embodiments of the invention, the laser emitter is a red light spot laser, in order to detect the distance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an imaging module according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a photosensitive assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a laser displacement sensor according to an embodiment of the present invention.
The reference numbers are as follows:
the imaging module 100, the imaging lens group 110, the narrow band filter 120, the photosensitive component 200, the photosensitive element 210, the housing 220, the optical path channel 221, the card slot 222, the adhesive layer 223, the laser emitter 300, the object to be measured 400, the laser 500 and the reflected light 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the present number, and the terms greater than, less than, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
CCD (Charge-coupled Device): a charge coupled device.
First aspect
Referring to fig. 1, an imaging module 100 includes: an imaging lens group 110 and a narrowband filter 120. The narrow band filter 120 is installed on the light exit side of the imaging lens group 110, and is perpendicular to the optical axis of the imaging lens group 110. Specifically, the imaging lens group 110 receives the reflected light 600, the reflected light 600 reaches the narrowband filter 120 after passing through the imaging lens group 110, the signal light in the reflected light 600 can pass through the narrowband filter 120, and the stray light in the reflected light 600 is reflected or absorbed by the narrowband filter 120. In addition, the narrow band pass filter 120 is located behind the imaging lens group 110 and perpendicular to the optical axis of the imaging lens group 110, so that the included angle between the reflected light 600 and the narrow band pass filter 120 is small, stray light in the reflected light 600 can be effectively filtered, signal light in the reflected light 600 can be better transmitted, the transmittance of the signal light is improved, and the transmittance of the stray light is reduced. In addition, because the narrowband filter 120 used can be conventional and does not need to be customized, the cost is reduced and the versatility is improved.
It should be noted that the imaging lens group 110 includes an aspheric lens and a plurality of spherical lenses, and the aspheric lens is located behind at least one spherical lens, so that light passes through the at least one spherical lens and then passes through the aspheric lens. The spherical lens is used for focusing, and the aspheric lens positioned behind the spherical lens is used for correcting spherical aberration brought by focusing of the spherical lens, namely the aspheric lens is used for correcting imaging blur generated by focusing of the spherical lens, so that clear imaging is facilitated.
Second aspect of the invention
Referring to fig. 2, a photosensitive assembly 200 includes a photosensitive element 210, a housing 220, and the imaging module 100 of the first aspect. The photosensitive element 210 and the imaging module 100 are mounted on the housing 220, the housing 220 is provided with an optical path channel 221, the imaging module 100 is located at the front end of the optical path channel 221, and the photosensitive element 210 is located at the tail end of the optical path channel 221. Specifically, the reflected light 600 is focused by the imaging lens group 110, reaches the narrowband filter 120, and by reflection and absorption of the narrowband filter 120, the signal light in the reflected light 600 passes through the narrowband filter 120, follows the optical path channel 221, and finally reaches the photosensitive element 210, so that the photosensitive element 210 receives useful signal light, and reduces received stray light, thereby improving the accuracy of the photosensitive element 210 for photosensitive.
It should be noted that, a card slot 222 is further disposed on the housing 220, and the photosensitive element 210 and the imaging module 100 are fixedly mounted on the housing 220 through the card slot 222, so that the photosensitive element 210 and the imaging module 100 are conveniently mounted and fixed, and the photosensitive element 210 can receive the signal light.
It should be noted that the housing 220 may further be provided with an adhesive layer 223, and the fixing manner of the narrowband filter 120 may be replaced by fixing the adhesive layer 223 by the card slot 222. The fixing mode of fixing the narrowband filter 120 by the adhesive layer 223 can be performed during the calibration of the photosensitive assembly 200, that is, after the position of the narrowband filter 120 is calibrated, the installation position of the narrowband filter 120 is determined, and then the adhesive layer 223 is formed between the narrowband filter 120 and the housing 220 by using adhesives such as glue and the like to fix the narrowband filter 120, and the adhesive layer 223 can be removed when a fixed position of the narrowband filter 120 is found to be wrong, so that the narrowband filter can be fixed again, and the fault tolerance can be increased.
It should be noted that the photosensitive element 210 includes a line CCD or an area CCD, and is used for photosensitive and converting a received optical signal into a digital signal.
Third aspect of the invention
Referring to fig. 3, a laser displacement sensor includes a laser emitter 300 and a photosensitive assembly 200 of the second aspect in partial or full structure, the laser emitter 300 being mounted on a housing 220. Specifically, the laser emitter 300 fixed on the housing 220 emits the laser 500, and when the laser 500 reaches the object to be measured 400, the reflected light 600 is generated; the imaging lens group 110 in the photosensitive assembly 200 receives the reflected light 600 and focuses the reflected light 600, the reflected light 600 passes through the imaging lens group 110 and then reaches the narrow band filter 120, and because the narrow band filter 120 is perpendicular to the optical axis of the imaging lens group 110, and the included angle between the reflected light 600 and the narrow band filter 120 is small, the narrow band filter 120 has a better filtering effect on the reflected light 600, so that the signal light in the reflected light 600 can better penetrate through the narrow band filter 120 and reach the photosensitive element 210, the accuracy is improved, and the laser displacement sensor can measure the distance more accurately.
| Detecting distance (unit: mm) | First angle of incidence (unit: degree) | Second angle of incidence (unit: degree) |
| 50 | 8.044 | 40.231 |
| 100 | 1.489 | 30.255 |
| 150 | 0.893 | 26.647 |
| 200 | 2.117 | 24.795 |
| 250 | 2.860 | 23.668 |
| 300 | 3.359 | 22.911 |
| 500 | 4.365 | 21.383 |
TABLE 1
In table 1, the detection distance refers to a distance between the laser displacement sensor and the object to be measured 400; the first incident angle means: when the narrowband filter 120 is located behind the imaging lens group 110 and is perpendicular to the optical axis of the imaging lens group 110, the reflected light 600 forms an included angle with the narrowband filter 120; the second incident angle refers to an angle between the reflected light 600 and the narrow band pass filter 120 located in front of the light sensing element 210. In the case that the detection distance is the same, the included angle of the first incident angle is smaller compared to the second incident angle, so that the photosensitive element 210 receives more accurate signal light, and the variation range of the first incident angle is smaller as the detection distance increases, so that the detection range of the laser displacement sensor is larger.
It should be noted that the laser emitter 320 may employ a red spot laser to facilitate the distance measurement of the laser displacement sensor.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. An imaging module, comprising:
the imaging lens group comprises an aspheric lens and a plurality of spherical lenses, and the aspheric lens is positioned behind at least one spherical lens;
the narrow band filter is arranged on the light emergent side of the imaging lens group and is vertical to the optical axis of the imaging lens group.
2. A photosensitive assembly, comprising a photosensitive element, a housing and the imaging module of claim 1, wherein the photosensitive element and the imaging module are mounted on the housing, the housing is provided with a light path channel, the imaging module is located at the front end of the light path channel, and the photosensitive element is located at the tail end of the light path channel.
3. A photosensitive assembly according to claim 2, wherein a slot is further provided on the housing, and the photosensitive element and the imaging module are fixedly mounted on the housing through the slot.
4. A photosensitive assembly according to claim 2, wherein a slot and an adhesive layer are further disposed on the housing, the imaging lens group and the photosensitive element are fixedly mounted on the housing through the slot, and the narrowband filter is fixedly mounted on the housing through the adhesive layer.
5. A photosensitive assembly according to any one of claims 2 to 4, wherein the photosensitive element comprises a line CCD or an area CCD.
6. A laser displacement sensor comprising a laser emitter and a photosensitive assembly according to any one of claims 2 to 5, the laser emitter being mounted on the housing.
7. The laser displacement sensor according to claim 6, wherein the laser emitter is a red spot laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023196206.6U CN214315378U (en) | 2020-12-24 | 2020-12-24 | Imaging module, photosensitive assembly and laser displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023196206.6U CN214315378U (en) | 2020-12-24 | 2020-12-24 | Imaging module, photosensitive assembly and laser displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214315378U true CN214315378U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023196206.6U Active CN214315378U (en) | 2020-12-24 | 2020-12-24 | Imaging module, photosensitive assembly and laser displacement sensor |
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| Country | Link |
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| CN (1) | CN214315378U (en) |
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