CN109883656B - Detection device and method for imperfect imaging lens - Google Patents
Detection device and method for imperfect imaging lens Download PDFInfo
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- CN109883656B CN109883656B CN201910230465.9A CN201910230465A CN109883656B CN 109883656 B CN109883656 B CN 109883656B CN 201910230465 A CN201910230465 A CN 201910230465A CN 109883656 B CN109883656 B CN 109883656B
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Abstract
The invention provides a detection device and a detection method for a non-perfect imaging lens, which comprise the following steps: a detection light source, a computer generated hologram, an image sensor, and a processor; wherein, the optical signal sent by the detection light source is received by the image sensor after passing through the hologram generated by the computer and the lens group to be detected; the computer-generated hologram is used for simulating a wavefront according to preset wavefront information; the image sensor performs photoelectric conversion on the received optical signal and sends a conversion result to the processor; and the processor analyzes the conversion result to obtain a detection result. The invention can save the assembly time of the lens, realize the detection to the imperfect imaging lens group, raise the detection efficiency of the lens group, accelerate the speed that the lens group is put into use; and assembly errors are prevented from being introduced in lens detection, so that the detection precision of the lens is effectively improved.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to a detection device and a detection method for an imperfect imaging lens.
Background
The lens is a core component of photographic products such as cameras, video cameras, mobile phones and the like, and the imaging quality of the lens directly determines the shooting quality of the photographic products. In the traditional lens imaging quality detection, external stray light is generally shielded by a black box, and the imaging quality of a lens is detected after a plurality of lenses are completely arranged in the black box. The lens assembly formed by combining a plurality of lens groups is called a perfect lens, and the conventional lens detection method generally aims at perfect lens expansion.
When the lens processing precision of the multiple lens groups is low, each lens in the multiple lens groups needs to be detected, so that whether the precision meets the requirement or not is judged. However, the existing detection method cannot accurately detect the imaging quality of the lens group (referred to as a non-perfect imaging lens herein) which is not assembled into a lens.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a detection device and a detection method for a non-perfect imaging lens.
In a first aspect, an embodiment of the present invention provides a detection apparatus for a non-perfect imaging lens, including: a detection light source, a computer generated hologram, an image sensor, and a processor; wherein
The optical signal sent by the detection light source is received by the image sensor after passing through the hologram generated by the computer and the lens group to be detected;
the computer-generated hologram is used for simulating a wavefront according to preset wavefront information;
the image sensor performs photoelectric conversion on the received optical signal and sends a conversion result to the processor;
and the processor analyzes the conversion result to obtain a detection result.
Optionally, the detection light source is a collimator; a point light source and a reticle are arranged in the parallel light source; laser generated by the point light source is converted into an optical signal containing identification information after passing through the reticle;
and the parallel light emitted by the collimator sequentially passes through the computer-generated hologram and the lens group to be detected and then is received by the image sensor.
Optionally, the number of the parallel light pipes is multiple.
Optionally, the method further comprises: a focusing lens group; the detection light source is a point light source, and light signals sent by the point light source pass through the reticle to obtain light signals containing identification information;
the optical signal is received by the image sensor after sequentially passing through the lens group to be detected, the computer-generated hologram and the focusing lens group.
Optionally, the number of the focusing lens groups is multiple;
when the number of the focusing lens groups is 3, one focusing lens group is arranged on the optical axis of the lens group to be detected; the other two focusing lens groups are arranged at non-optical axis positions.
Optionally, the incident light of the focusing lens group is parallel light; the image sensor is arranged on a focal plane of the focusing lens group and used for receiving an image after passing through the focusing lens group.
Optionally, the wavefront information is ideal wavefront information of a matched lens group given by optical design software, where the matched lens group is a lens group that forms a complete device lens with the lens group to be detected.
In a second aspect, an embodiment of the present invention provides a method for detecting a non-perfect imaging lens, which is applied to a device for detecting a non-perfect imaging lens in any one of the first aspect; the method comprises the following steps:
step A: placing a lens group to be detected at a preset position of the detection device;
and B: starting a detection light source and acquiring a light signal reaching an image sensor;
and C: and analyzing the conversion result obtained by the image sensor by using a processor to obtain a detection result.
Optionally, a mounting seat is arranged at the preset position, and the detection device further comprises an automatic lens taking device; the automatic lens taking device comprises: an automatic arm; the step A comprises the following steps:
and acquiring a lens group to be detected from a designated position through the automatic arm, and assembling the lens group to be detected on the mounting seat.
Optionally, the step C includes:
adjusting the distance between the lens group to be detected and the image sensor and the computer-generated hologram, and fixing the lens group to be detected;
starting a detection light source to acquire an optical signal acquired by an image sensor;
and comparing the optical signal acquired by the image sensor with a reference optical signal to obtain a detection result of the lens group to be detected.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the detection device and the detection method for the imperfect imaging lens, provided by the embodiment of the invention, can save the lens assembly time, realize the detection of the imperfect imaging lens group, improve the detection efficiency of the lens group and accelerate the using speed of the lens group. When the distance between the matched lens and the lens group to be detected is smaller, the matched lens and the lens group to be detected are easy to introduce assembly errors, and the assembly errors can be prevented from being introduced in lens detection, so that the detection precision of the lens is effectively improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a detection apparatus for a non-perfect imaging lens according to an embodiment of the present invention;
fig. 2 is a detection apparatus of a non-perfect imaging lens according to a second embodiment of the present invention;
fig. 3 is a detection apparatus of a non-perfect imaging lens according to a third embodiment of the present invention;
fig. 4 is a detection apparatus of a non-perfect imaging lens according to a fourth embodiment of the present invention;
fig. 5 is a detection apparatus for a non-perfect imaging lens according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
To facilitate understanding of the technical solutions in the present application, the technical terms related to the technical solutions in the present application are explained.
Computer-Generated Holograms (CGH), which are capable of recording both the intensity and phase of information. At present, computer generated holograms can be written directly on aluminium films of glass substrates using pulses of 800nm wavelength 120fs generated by a titanium-sapphire laser, without the need for masks or prior or subsequent treatment of the substrate.
The spatial light modulator is under active control, and can modulate a parameter of an optical field through liquid crystal molecules, for example, by modulating the amplitude of the optical field, modulating the phase through a refractive index, modulating the polarization state through rotation of a polarization plane, or realizing conversion of incoherent-coherent light, so that certain information is written into an optical wave to achieve the purpose of optical wave modulation. The method can conveniently load information into a one-dimensional or two-dimensional optical field, and quickly process the loaded information by utilizing the advantages of wide bandwidth of light, multi-channel parallel processing and the like. The required wavefront is simulated by a spatial light modulator in the present invention.
The wave front is a surface formed by points which are reached by propagating the vibration emitted by a wave source in the medium through the same time, wherein the vibration phases of the points on the same wave front are the same.
Wavefront, the curved surface formed by equiphase surfaces when waves are transmitted to a certain position is called wavefront; also refers to a curved surface formed by connecting points at the forefront of which the fluctuation reaches at a certain moment.
The reticle is matched with the light source, so that an imaging mark with a target can be formed; and then evaluating the imaging quality of the lens by using the imaging quality of the imaging identification received by the image sensor.
A collimator for generating a beam of light from infinity, the beam of light being referred to as parallel light; it is an important tool for assembling and correcting the optical instrument and is also an important component in the optical measurement instrument. By using different reticle plates, together with a micrometer lens or a microscope system, the focal length, discrimination and other imaging qualities of the lens group can be measured.
Example 1
Fig. 1 is a detection apparatus for a non-perfect imaging lens according to an embodiment of the present invention, including: a detection light source 11, a computer generated hologram 12, an image sensor 13 and a processor 14; wherein: the optical signal sent by the detection light source 11 is received by the image sensor 13 after passing through the computer-generated hologram 12 and the lens group 15 to be detected; the computer generated hologram 12 is used to simulate a wavefront according to preset wavefront information; the image sensor 13 performs photoelectric conversion on the received optical signal and sends the conversion result to the processor 14; the processor 14 analyzes the conversion result to obtain a detection result.
In this embodiment, the order of the computer-generated hologram and the to-be-detected lens set is not limited. In other words, the light may first pass through the computer generated hologram or may first pass through the set of lenses to be detected.
It should be noted that, by the solution provided by the above embodiment, the technical effects at least include:
first, a detection method for detecting imperfect imaging lens assembly is provided.
Second, the quality of the imperfectly imaged lens set may be detected. The inventors thought at the time of engineering practice that if the lens barrel is divided into a plurality of lens groups, the processing difficulty or processing accuracy of the lens groups may be different. For a lens group with higher machining precision, detection may not be needed; for a lens group with low machining precision, the lens group may need to be detected one by one to determine whether the lens group is used. Thus, the inventor thought that the quality of a lens group with imperfect imaging could be tested, rather than assembling multiple lenses into a lens with perfect imaging. From this, can accomplish the detection to the imperfect formation of image lens group, improve lens group detection efficiency for the speed that lens group put into use.
Thirdly, compared with a mode of directly installing a matched lens group and a lens group to be detected to form a perfect imaging lens and then detecting, the method removes the error of the matched lens group; moreover, if the distance between the fitting lens group and the lens group to be detected is small as a design value, the fitting lens group and the lens group to be detected are not easily assembled to a proper position, that is, an assembly error is easily generated. Therefore, the detection accuracy of the lens group to be detected is higher in the mode provided by the application.
It should be noted that, the CGH simulates one matched lens group at a time, and the CGH needs to produce a corresponding wavefront hologram by a computer according to the designated matched lens group and etch the wavefront hologram onto a glass sheet.
Example 2
Fig. 2 is a detection apparatus for a non-perfect imaging lens according to a second embodiment of the present invention, including: a collimator 21, a computer-generated hologram 12, an image sensor 13; the optical signal sent by the collimator 21 is received by the image sensor 13 after passing through the computer-generated hologram 12 and the lens group 15 to be detected; the computer generated hologram 12 is used to simulate a wavefront according to preset wavefront information; the image sensor 13 performs photoelectric conversion on the received optical signal and sends the conversion result to the processor 14; the processor 14 analyzes the conversion result to obtain a detection result. The collimator 21 is provided with a point light source and a reticle, and light emitted by the point light source forms a light signal containing identification information after passing through the reticle.
In an alternative embodiment, the number of the collimator 21 is plural.
Example 3
Fig. 3 is a detection apparatus for a non-perfect imaging lens according to a third embodiment of the present invention, including: a point light source 31, a computer-generated hologram 12, an image sensor 13, a focusing lens group 32; an optical signal sent by the point light source 31 passes through the reticle to obtain an optical signal containing identification information, and the optical signal sequentially passes through the lens group 15 to be detected, the computer-generated hologram 12 and the focusing lens group 32 and then is received by the image sensor 13; the computer generated hologram 12 is used to simulate a wavefront according to preset wavefront information; the image sensor 13 performs photoelectric conversion on the received optical signal and sends the conversion result to the processor 14; the processor 14 analyzes the conversion result to obtain a detection result.
In an alternative embodiment, the focusing lens group 32 is plural in number; when the number of the focusing lens groups 32 is 3, one of the focusing lens groups 32 is disposed on the optical axis of the lens group 15 to be detected; the other two focusing lens groups 32 are disposed at non-optical axis positions.
In another alternative embodiment, the incident light of the focusing lens group 32 is parallel light; wherein, the image sensor 13 is disposed on the focal plane of the focusing lens group 32 for receiving the image after passing through the focusing lens group 32.
It should be noted that in the detection apparatus shown in fig. 1, fig. 2, and fig. 3, the wavefront information is ideal wavefront information of a matching lens set given by the optical design software, where the matching lens set is a lens set that forms a complete device lens with the lens set to be detected.
It should be noted that, when designing the matched lens group and the lens group to be detected, the optical design software may provide the wavefront information reaching the lens group to be detected, which simulates the real situation, or the wavefront information reaching the matched lens group. Thus, a simulated wavefront can be realized. In this way, theoretical wavefront information can be directly obtained from optical design software, and the accuracy of the simulated wavefront information can be improved.
In some embodiments, the wavefront information of the actual matched lens set may be collected after the matched lens set is manufactured, but this approach is less accurate. Since the fitting lens set may have been subject to error with respect to the theoretical value.
In this embodiment, the focusing lens group 32 is an optional component. In addition to three focusing lens groups 32, 5, 9 or more focusing lens groups 32 may be provided to form multiple fields of view.
In the present embodiment, the focusing lens group 32 functions to focus and image the incident parallel light onto the image sensor 13. Therefore, it is necessary to dispose the image sensor 13 on the focal plane of the focusing lens group 32. In an alternative, the focusing optic set and the image sensor may be integrated to form a receiving imaging assembly.
It should be noted that, the computer-generated hologram 12 simulates a fitting lens at a time, and the computer generates a wavefront hologram corresponding to the fitting lens and etches the wavefront hologram onto the glass sheet, so that the simulated wavefront information obtained by the computer-generated hologram 12 is more accurate.
Example 4
Fig. 4 is a detection apparatus for a non-perfect imaging lens according to a fourth embodiment of the present invention, as shown in fig. 4, the apparatus in this embodiment may include: a detection light source 11, a fitting lens simulator 41, and an image sensor 13; the optical signal emitted by the detection light source 11 is received by the image sensor 13 after passing through the lens simulator 41 and the lens group 15 to be detected; the image sensor 13 performs photoelectric conversion on the received optical signal and sends the conversion result to the processor 14, and the processor 14 analyzes the conversion result to obtain a detection result of the lens group 15 to be detected.
In this embodiment, the fitting lens simulator 41 is used to simulate wavefront information reaching the fitting lens; the matched lens is a lens which can be combined with the lens group to be detected to form a complete equipment lens.
In an alternative embodiment, a spatial light modulator may be used to simulate the wavefront information arriving at the mating optic. In this embodiment, the spatial light modulator is used to simulate wavefront information of an optical signal after passing through a matched lens (the matched lens and a lens group to be detected can theoretically form a perfect imaging lens).
In an alternative mode, when the optical signal emitted by the detection light source 11 first reaches the fitted lens simulator 41, the fitted lens simulator 41 converts the optical signal into wavefront information passing through the fitted lens; the wavefront information is received by the image sensor 13 after passing through the lens set 15 to be detected. Therefore, the quality of the lens group 15 to be detected (imperfect imaging lens group) can be judged through the simulated perfect imaging lens.
In another alternative, when the optical signal emitted by the detection light source 11 first reaches the lens group 15 to be detected, and then passes through the matched lens simulator 41, the matched lens simulator 41 converts the optical signal passing through the lens group 15 to be detected into wavefront information passing through the matched lens; the wavefront information is received by the image sensor 13. Therefore, the quality of the lens group 15 to be detected (imperfect imaging lens group) can be judged through the simulated perfect imaging lens.
Example 5
Fig. 5 is a detection apparatus for a non-perfect imaging lens according to a fifth embodiment of the present invention, as shown in fig. 5, the apparatus in this embodiment may include: the system comprises a laser light source 51, a reticle 52, a spatial light modulator 53, a zoom lens 54, a lens group to be detected 15 and an image sensor 13; the laser light generated by the laser light source 51 is converted into an optical signal containing identification information after passing through the reticle 52.
Alternatively, the number of detection light sources composed of the laser light source 51 and the reticle 52 is plural.
In this embodiment, the spatial light modulator 53 modulates the phase of the optical signal generated by the laser light source 51 after passing through the reticle 52, and simulates wavefront information reaching the fitting lens.
It should be noted that the zoom lens 54 in the present embodiment is an optional component. Since the spatial light modulator 53 uses only +1 and-1 stages, the exit angle of the generated optical signal is small. Therefore, in practical applications, it can be determined that the zoom lens 54 is not required to be disposed according to the properties of the lens group 15 to be detected. If a large angle of incident light is required for the lens group 15 to be inspected, a zoom lens 54 may be disposed between the spatial light modulator 53 and the lens group to be inspected in order to enlarge the angle of the emergent light of the spatial light modulator. By setting the zoom lens 54; the optical signal containing wavefront information generated by spatial light modulator 53 may be adjusted to enlarge the angle of incidence of the optical signal entering the set of lenses 15 to be inspected.
The embodiment of the invention also provides a detection method of the imperfect imaging lens, which applies the detection device of the imperfect imaging lens in any one of figures 1 to 4; the method comprises the following steps:
step A: placing a lens group to be detected at a preset position of a detection device;
and B: starting a detection light source and acquiring a light signal reaching an image sensor;
and C: and analyzing the conversion result obtained by the image sensor by using a processor to obtain a detection result.
Preferably, the preset position is provided with a mounting seat, and the detection device further comprises an automatic lens taking device; the automatic lens taking device comprises: an automatic arm; the step A comprises the following steps:
the lens group to be detected is obtained from the designated position through an automatic arm, and the lens group to be detected is assembled on the mounting seat.
It should be noted that, by arranging the mounting seat, the lens group to be detected can be conveniently placed at a preset position, so that the placing speed of the device is increased, and the detection speed is increased. Set up automatic arm and place and wait to detect lens group, can reduce cost and the operation error that the manpower brought to, improve detection speed and detection accuracy.
Preferably, step C includes:
adjusting the distance between the lens group to be detected and the image sensor and the computer-generated hologram, and fixing the lens group to be detected;
starting a detection light source to acquire an optical signal acquired by an image sensor;
and comparing the optical signal acquired by the image sensor with the reference optical signal to obtain a detection result of the lens group to be detected.
Here, the image sensor performs photoelectric conversion on the received light, the image sensor may send a photoelectric conversion result to the processor, the processor processes the electrical signal (in a manner of fast fourier transform to obtain MTF, etc.), and compares the processing result with an expected result (for example, a theoretical result of optical design software), so as to obtain a detection result of the lens group to be detected.
It should be noted that, the steps in the detection method for the imperfect imaging lens provided by the present invention may be implemented by using corresponding modules, units, and the like in the detection device for the imperfect imaging lens, and those skilled in the art may refer to the technical scheme of the system to implement the step flow of the method, that is, the embodiment in the system may be understood as a preferred example of the implementation method, and will not be described herein again.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices provided by the present invention in purely computer readable program code means, the method steps can be fully programmed to implement the same functions by implementing the system and its various devices in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices thereof provided by the present invention can be regarded as a hardware component, and the devices included in the system and various devices thereof for realizing various functions can also be regarded as structures in the hardware component; means for performing the functions may also be regarded as structures within both software modules and hardware components for performing the methods.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A detection device for a non-perfect imaging lens is characterized by comprising: a detection light source, a computer generated hologram, an image sensor, and a processor; wherein:
the optical signal sent by the detection light source is received by the image sensor after passing through the hologram generated by the computer and the lens group to be detected;
the computer-generated hologram is used for simulating a wavefront according to preset wavefront information; the wavefront information is ideal wavefront information of a matched lens group given by optical design software, wherein the matched lens group is combined with the lens group to be detected to form a lens group of a complete equipment lens;
the image sensor performs photoelectric conversion on the received optical signal and sends a conversion result to the processor;
and the processor analyzes the conversion result to obtain a detection result.
2. The detecting device for the imperfect imaging lens of claim 1, wherein the detecting light source is a collimator; a point light source and a reticle are arranged in the parallel light source; laser generated by the point light source is converted into an optical signal containing identification information after passing through the reticle;
and the parallel light emitted by the collimator sequentially passes through the computer-generated hologram and the lens group to be detected and then is received by the image sensor.
3. The detecting device for the imperfect imaging lens of claim 2, wherein the number of the collimator is plural.
4. The apparatus for detecting a non-perfect imaging lens as claimed in claim 1, further comprising: a focusing lens group; the detection light source is a point light source, and light signals sent by the point light source pass through the reticle to obtain light signals containing identification information;
the optical signal is received by the image sensor after sequentially passing through the lens group to be detected, the computer-generated hologram and the focusing lens group.
5. The detecting device for the imperfect imaging lens of claim 4, wherein said focusing lens set is plural in number;
when the number of the focusing lens groups is 3, one focusing lens group is arranged on the optical axis of the lens group to be detected; the other two focusing lens groups are arranged at non-optical axis positions.
6. The detecting device for the imperfect imaging lens of claim 4, wherein the incident light of said focusing lens set is parallel light; the image sensor is arranged on a focal plane of the focusing lens group and used for receiving an image after passing through the focusing lens group.
7. A detection method of a non-perfect imaging lens, which is applied to a detection device of the non-perfect imaging lens of any one of claims 1 to 6; the method comprises the following steps:
step A: placing a lens group to be detected at a preset position of the detection device;
and B: starting a detection light source and acquiring a light signal reaching an image sensor;
and C: and analyzing the conversion result obtained by the image sensor by using a processor to obtain a detection result.
8. The inspection method of claim 7, wherein a mounting seat is provided at the predetermined position, the inspection apparatus further comprising an automatic mirror extractor; the automatic lens taking device comprises: an automatic arm; the step A comprises the following steps:
and acquiring a lens group to be detected from a designated position through the automatic arm, and assembling the lens group to be detected on the mounting seat.
9. The detection method according to claim 8, wherein the step C comprises:
adjusting the distance between the lens group to be detected and the image sensor and the computer-generated hologram, and fixing the lens group to be detected;
starting a detection light source to acquire an optical signal acquired by an image sensor;
and comparing the optical signal acquired by the image sensor with a reference optical signal to obtain a detection result of the lens group to be detected.
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