Optical assembly and spectrum camera

Abstract

The utility model discloses an optical assembly and a spectrum camera. The optical assembly comprises a first miniature optical device, and a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a beam splitter prism and a second miniature optical device which are sequentially arranged along the incident direction of a light path, wherein the first micro optical device is arranged in the direction of refracted light of the beam splitter prism; the beam splitter prism is used for splitting light beams of a visible light band and a near-infrared band; the first micro optical device and the second micro optical device are used for constructing an F-P cavity for realizing a wavelength selection function; the fifth lens and the sixth lens form a first doublet lens group, and the seventh lens and the eighth lens form a second doublet lens group. According to the optical assembly, the NIR wave band and the VIS wave band are coaxial through the coaxial optical path scheme, and use is easier and more convenient. The utility model can be widely applied to the technical field of optical equipment.

Description

Technical Field

[0001] The present application relates to the technical field of optical equipment, and in particular to an optical component and a spectral camera. Background Art

[0002] Spectral imaging is based on the principle of combining optical information with spatial information. It guides the incident light to the surface of the observed object, interacts with the object, and then uses a spectroscopic instrument to decompose the reflected or transmitted light to obtain the spectral information of the object at different wavelengths. Through appropriate optical design and detectors, an image is formed and presented in the form of a spectral cube. Hyperspectral imaging obtains high-resolution spectral information in a relatively wide wavelength range for detailed spectral feature extraction. It is widely used in scientific research, medicine, environmental monitoring and other fields, providing accurate analysis and identification of the material composition and chemical properties of objects.

[0003] In the related technology, the technical route of using surface exposure to obtain a spectral cube in a spectral camera is mainly to construct an FP cavity through MEMS (micro-optical devices), and to achieve wavelength selection by controlling two parallel plates in the MEMS to achieve changes in the FP cavity. When the FP cavity is performing wavelength selection, if single-mode precise wavelength selection is to be achieved, the current solution is to use two sets of optical systems to respectively achieve wavelength selection for the VIS band and the NIR band. The two sets of imaging optical paths are equipped with wavelength selection devices and corresponding CMOS sensors. In addition to increasing the system cost, this also limits the use scenarios of this off-axis dual optical path. When performing image fusion and alignment of the VIS band and the NIR band at the system level, the introduced gap variable (the main optical axis gap between the dual optical paths) will greatly increase the difficulty of calibration, limit the use scenarios, and have poor practicality.

[0004] In summary, the problems existing in related technologies need to be solved urgently. Utility Model Content

[0005] The purpose of this application is to solve one of the technical problems existing in the related art to at least a certain extent.

[0006] To this end, an object of an embodiment of the present application is to provide an optical component and a spectral camera.

[0007] In order to achieve the above technical objectives, the technical solutions adopted by the embodiments of the present application include:

[0008] In one aspect, an embodiment of the present application provides an optical component, comprising:

[0009] a first micro-optical device and a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a beam splitter prism, and a second micro-optical device arranged in sequence along the incident direction of the light path;

[0010] Wherein, the first micro-optical device is arranged in the direction of the light refracted by the beam splitter prism; the beam splitter prism is used to split the light beams in the visible light band and the near-infrared band, and the first micro-optical device and the second micro-optical device are used to construct an FP cavity that realizes the wavelength selection function;

[0011] The fifth lens and the sixth lens form a first doublet lens group, and the seventh lens and the eighth lens form a second doublet lens group.

[0012] In addition, the optical assembly according to the above embodiment of the present application may also have the following additional technical features:

[0013] Further, in one embodiment of the present application, the first lens, the second lens, the third lens, and the fourth lens form a front lens combination;

[0014] The ratio of the combined focal length of the front lens group to the total focal length of the optical component is -1.1.64.

[0015] Further, in one embodiment of the present application, a focal length ratio of the first lens and the front lens group is -4.337.

[0016] Further, in one embodiment of the present application, a focal length ratio of the second lens and the front lens group is 16.549.

[0017] Further, in one embodiment of the present application, a focal length ratio of the third lens and the front lens group is 5.155.

[0018] Further, in one embodiment of the present application, a focal length ratio of the fourth lens and the front lens group is -1.084.

[0019] Further, in one embodiment of the present application, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens form a rear lens combination;

[0020] The ratio of the combined focal length of the rear lens group to the total focal length of the optical component is 1.428.

[0021] Further, in one embodiment of the present application, the focal length ratio of the first double-cemented lens group and the rear lens group is 1.56, and the focal length ratio of the second double-cemented lens group and the rear lens group is -47.789.

[0022] Further, in an embodiment of the present application, a focal length ratio of the ninth lens element and the rear lens group is 3.243.

[0023] On the other hand, an embodiment of the present application provides a spectral camera, comprising the aforementioned optical component, a first sensor, and a second sensor;

[0024] The first sensor is disposed on an imaging surface of the first micro-optical device, and the second sensor is disposed on an imaging surface of the second micro-optical device.

[0025] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application:

[0026] An optical component and a spectral camera disclosed in an embodiment of the present application include a first micro-optical device and a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a beam splitter prism, and a second micro-optical device arranged in sequence along the incident direction of the optical path; wherein the first micro-optical device is arranged in the direction of the light refracted by the beam splitter prism; the beam splitter prism is used to split the light beams in the visible light band and the near infrared band, the first micro-optical device and the second micro-optical device are used to construct an FP cavity that realizes the wavelength selection function; the fifth lens and the sixth lens form a first double-cemented lens group, and the seventh lens and the eighth lens form a second double-cemented lens group. The optical component realizes the coaxiality of the NIR and VIS bands through the coaxial optical path solution, realizes the splitting multiplexing under the condition of maximum energy retention, and the imaging lens has excellent performance and is easier to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the embodiments of the present application or the drawings of the related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of an optical component of a dual-channel off-axis solution provided in the related art is shown;

[0029] Figure 2 A schematic diagram of the structure of an optical component provided in an embodiment of the present application is shown;

[0030] Figure 3 A schematic diagram showing the working principle of a coaxial solution provided in an embodiment of the present application is shown;

[0031] Figure 4 shows a spot diagram obtained by testing an optical component provided in an embodiment of the present application;

[0032] Figure 5 A distortion diagram obtained by testing an optical component provided in an embodiment of the present application is shown;

[0033] Figure 6 An MTF diagram obtained by testing an optical component provided in an embodiment of the present application is shown;

[0034] Figure 7 A schematic diagram of the distribution of the chief ray angles of an optical component under a normalized field of view is shown in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. The described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0036] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0037] In the description of the present application, it should be understood that the terms "length", "up", "down", "front", "back", "left", "right", "top", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations:

[0040] 1) Normalized field of view refers to the standardization or normalization of the field of view of an optical system.

[0041] 2) Normalized field of Aperture is a method to standardize the parameters of an optical system. Normalized field of Aperture means dividing the aperture size of an optical system by a certain reference value of the system to obtain a relative measure.

[0042] 3) FP cavity is an optical cavity composed of two parallel and partially transparent mirrors. Due to the interference effect, only light of a specific wavelength can resonate in the cavity, resulting in a series of passed and suppressed spectral peaks.

[0043] 4) Principal optical axis: It is an important concept in optical systems. It refers to a virtual straight line passing through the center of an optical element (such as a lens or a reflector). Light propagating along this straight line will not be deflected if it does not pass through the center point of the optical element. The principal optical axis is usually the symmetry axis of the optical system. Objects or scenes that are symmetrical along this axis will be symmetrically displayed in the image.

[0044] 5) VIS band (visible light band), which is the range of the electromagnetic spectrum that the human eye can perceive. In the spectrum, the visible light band generally covers a wavelength range from about 400 nanometers (violet light) to 700 nanometers (red light).

[0045] 6) NIR band (near infrared band) is a region of the electromagnetic spectrum between visible light and mid-infrared. It is usually defined as the wavelength range from 700 nanometers (nm) to 2500 nanometers (nm), or from 12800 cm^-1 to 4000 cm^-1 in wavenumber. The near infrared band is just outside the red light of the visible spectrum.

[0046] 7) Airy Disk or Airy Disk is a concept in optics, which refers to the specific pattern of light intensity distribution formed on the focal plane after a focused light beam passes through an optical system with a circular aperture (such as a lens or a telescope), which determines the diffraction limit of the optical system.

[0047] 8) Spot Diagram is a tool used in optical design to evaluate and compare the performance of different optical systems. It shows the focusing of the light beam passing through the optical system on the focal plane and is usually used to analyze and optimize the design of lenses or reflectors.

[0048] Spectral imaging is based on the principle of combining optical information with spatial information. It guides the incident light to the surface of the observed object, interacts with the object, and then uses a spectroscopic instrument to decompose the reflected or transmitted light to obtain the spectral information of the object at different wavelengths. Through appropriate optical design and detectors, an image is formed and presented in the form of a spectral cube. Hyperspectral imaging obtains high-resolution spectral information in a relatively wide wavelength range for detailed spectral feature extraction. It is widely used in scientific research, medicine, environmental monitoring and other fields, providing accurate analysis and identification of the material composition and chemical properties of objects.

[0049] In the related technology, the technical route of using surface exposure to obtain a spectral cube in a spectral camera is mainly to construct an FP cavity through MEMS (micro-optical devices), and to achieve wavelength selection by controlling two parallel plates in the MEMS to achieve changes in the FP cavity. When the FP cavity is performing wavelength selection, if single-mode precise wavelength selection is to be achieved, the current solution is to use two sets of optical systems to respectively achieve wavelength selection for the VIS band and the NIR band. The two sets of imaging optical paths are equipped with wavelength selection devices and corresponding CMOS sensors. In addition to increasing the system cost, this also limits the use scenarios of this off-axis dual optical path. When performing image fusion and alignment of the VIS band and the NIR band at the system level, the introduced gap variable (the main optical axis gap between the dual optical paths) will greatly increase the difficulty of calibration, limit the use scenarios, and have poor practicality.

[0050] For details, please refer to Figure 1 , Figure 1 An optical component of a dual-channel off-axis solution provided in the related art is shown. Figure 1It can be seen that the VIS channel and NIR channel of the optical component are respectively the optical path system working in the VIS band and the optical path system working in the NIR band, and there must be a channel gap between the two channels; the principal optical axis of the VIS channel and the principal optical axis of the NIR channel are parallel to each other. In the actual use scenario of the spectral camera, if you want to collect the complete spectral response curve of the target, you need to obtain the spectral response of the target in both the VIS and NIR bands at the same time. Therefore, the actual effective detection area changes with the position of the target. In addition, the matrix calculation parameters for dual-channel fusion of the target at different positions are also different. Whether from the perspective of usage scenarios or system calibration, Figure 1 The optical system groups shown will bring more difficulties and problems.

[0051] In view of this, an optical component and a spectral camera are provided in an embodiment of the present application. The optical component realizes the coaxiality of the NIR and VIS bands through a coaxial optical path solution, realizes spectroscopic multiplexing with maximum energy retention, and the imaging lens has excellent performance and is easier to use.

[0052] Below, in conjunction with specific drawings, an optical component and a spectral camera provided in an embodiment of the present application are described in detail.

[0053] The present application provides an optical component that can be applied to the technical field of optical devices. Figure 2 , an optical component provided in an embodiment of the present application mainly includes:

[0054] A first micro-optical device M1 and a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, an aperture L, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a beam splitter prism F, and a second micro-optical device M2, which are sequentially arranged along the incident direction of the light path;

[0055] The first micro-optical device M1 is arranged in the direction of light refraction by the beam splitter prism F; the beam splitter prism F is used to split the light beams in the visible light band and the near-infrared band, and the first micro-optical device M1 and the second micro-optical device M2 are used to construct an FP cavity that realizes a wavelength selection function;

[0056] The fifth lens G5 and the sixth lens G6 form a first doublet lens group, and the seventh lens G7 and the eighth lens G8 form a second doublet lens group.

[0057] In the embodiment of the present application, a spectral camera optical path architecture for dual sensors is provided, referring to Figure 3 , Figure 3The schematic diagram of the working principle of a coaxial solution provided in the embodiment of the present application shows that when the coaxial solution is used to collect the object to be measured, the VIS channel and the NIR channel are in a coaxial state in the optical sense; after the optical path calibration, the VIS channel and the NIR channel will not require too much alignment calibration. In addition, no matter what state the position of the object to be measured is in, the VIS channel and the NIR channel can achieve good physical level alignment, there is no limitation at the application level, and the spectroscopic multiplexing is achieved with maximum energy retention. The imaging lens has excellent performance and is easier to use.

[0058] In the present application, refer to Figure 2 The working parameters of the optical component can be as follows: focal length is 4.98mm, working wavelength range is 550nm~920nm, image height is 5.6mm. The optical system is designed with standard spherical mirror, the maximum viewing angle of the system is about 20°, and the spherical mirror system controls the light beam to be parallel to the normal direction of the FP cavity parallel plate after passing through the last lens.

[0059] Specifically, the optical component includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, an aperture L, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a beam splitter prism F, a first micro-optical device M1, and a second micro-optical device M2. The first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the aperture L, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9, the beam splitter prism F, and the second micro-optical device M2 are sequentially arranged along the incident direction of the light path. The first micro-optical device M1 is arranged in the direction of the light refracted by the beam splitter prism F, and the beam splitter prism F can divide the beam into two directions, one of which is incident on the first micro-optical device M1, and the other is incident on the second micro-optical device M2. The first micro-optical device M1 and the second micro-optical device M2 here can be used to construct an FP cavity that realizes a wavelength selection function.

[0060] In the embodiment of the present application, the optical characteristic parameters of some lenses and optical devices in the optical assembly are shown in Table 1 below:

[0061] Table 1

[0062]

[0063]

[0064] In the embodiment of the present application, the lenses in the optical assembly can be divided into two parts by the aperture L, which are recorded as a front lens combination and a rear lens combination, wherein the first lens G1, the second lens G2, the third lens G3, and the fourth lens G4 form a front lens combination, and the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, and the ninth lens G9 form a rear lens combination. Moreover, the fifth lens G5 and the sixth lens G6 form a first double-cemented lens group, and the seventh lens G7 and the eighth lens G8 form a second double-cemented lens group. These lenses and combinations satisfy the following parameter relationship:

[0065] The ratio of the combined focal length fq of the front lens assembly to the total focal length f of the entire lens of the optical assembly is -1.164;

[0066] The ratio of the focal length f1 of the first lens G1 to the combined focal length fq of the front lens group is -4.337;

[0067] The ratio of the focal length f2 of the second lens G2 to the combined focal length fq of the front lens group is 16.549;

[0068] The ratio of the focal length f3 of the third lens G3 to the combined focal length fq of the front lens group is 5.155;

[0069] The ratio of the focal length f4 of the fourth lens G4 to the combined focal length fq of the front lens group is -1.084;

[0070] The ratio of the combined focal length fh of the rear lens assembly to the total focal length f of the lens is 1.428;

[0071] The ratio of the focal length f56 of the first double cemented lens to the combined focal length fh of the rear lens group is 1.56;

[0072] The ratio of the focal length f78 of the second doublet lens to the combined focal length fh of the rear lens group is -47.789;

[0073] The ratio of the focal length f9 of the ninth lens G9 to the combined focal length fh of the rear lens group is 3.243.

[0074] In order to verify the lens effect of the optical assembly provided in the embodiment of the present application, it was tested under multiple optical performance parameters. The following are some test results and their corresponding descriptions.

[0075] Reference Figure 4 , Figure 4 The spot diagram obtained by testing an optical component provided in an embodiment of the present application is shown. The spot diagram is a tool used in optical design to evaluate and compare the performance of different optical systems, and shows the focusing of a light beam passing through the optical system on the focal plane; the spot diagram shows the area formed by the radius of the Airy disk. Figure 4It can be seen that the optical components in the embodiments of the present application have excellent imaging quality of the lens, and all operating wavelengths are within the radius of the Airy disk.

[0076] Reference Figure 5 , Figure 5 The distortion diagram obtained by testing an optical component provided in an embodiment of the present application is shown. Distortion refers to the deviation between the geometric shape of a straight line or plane object in a scene and the actual shape when imaging through a lens. Distortion is a type of aberration in an optical system. It does not change the clarity of the image, but causes the shape of the image to be distorted. Generally speaking, when an optical component is used in a photographic system, the optical TV distortion is less than 2%. The TV distortion of the optical component in the embodiment of the present application is less than 1%, which is better than the conventional one.

[0077] Reference Figure 6 , Figure 6 The MTF graph obtained by testing an optical component provided in an embodiment of the present application is shown. The MTF graph (Modulation Transfer Function Graph), i.e., the modulation transfer function graph, is an important tool for evaluating the imaging quality of an imaging system (such as a camera lens, a telescope, a microscope, etc.). MTF evaluates the imaging performance of the system by quantitatively describing the responsiveness of the imaging system to details of different spatial frequencies. The abscissa in the figure represents the spatial frequency, which refers to the frequency of detail changes in the image, usually measured in lines per millimeter (lp / mm for short) or cycles per degree. The ordinate in the figure is the MTF value, which refers to the modulation transfer capability of the imaging system for a specific spatial frequency, usually expressed as a percentage. Ideally, a perfect imaging system has an MTF value of 100% for all spatial frequencies. It can be seen that in the embodiment of the present application, the MTF graph of the optical component lens is distributed in the full field of view close to the diffraction limit.

[0078] Reference Figure 7 , Figure 7 FIG. 2 shows the distribution of the main ray angle of an optical component provided in an embodiment of the present application under a normalized field of view. Figure 7 It can be seen that under the normalized field of view, the distribution of the angle between the main ray of each field of view and the direction of the normal of the FP cavity parallel to the plane plate. According to the angle of the main ray of each field of view, it can be known that after constraining the CRA (Critical Angle of Reflection), the maximum angle of the main ray is about 1.6, which meets the splitting requirements while maintaining extremely high optical imaging quality. It is a better solution that balances cost and performance.

[0079] In an embodiment of the present application, a spectral camera is also provided, and the spectral camera may include the aforementioned optical component. Figure 2 In the embodiment of the present application, the spectral camera may include two image sensors, which are denoted as a first sensor and a second sensor. The two sensors may be arranged on the imaging surfaces of the first micro-optical device M1 and the second micro-optical device M2. For example, the sensor may be a CMOS sensor, which is not limited in the present application.

[0080] It can be understood that the advantages of an optical component and a spectral camera provided in the embodiments of the present application include at least:

[0081] 1. Since the VIS channel and the NIR channel are coaxially shared, the spectral information of the NIR band and the VIS band can be obtained at the same time. From the perspective of the system framework, there is no time domain delay between the NIR band and the VIS band information.

[0082] 2. Since NIR and VIS are split by the beam splitter prism F, the wavelength of VIS is 500-700 and the wavelength of NIR is 700-920, there is almost no energy loss, and the maximum efficiency of the NIR channel and the VIS channel can be achieved.

[0083] 3. The dual-sensor spectral camera optical path architecture has extremely high performance advantages. It can meet the needs of spectrometry while maintaining extremely high optical imaging quality. It is a better solution that balances cost and performance.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "another embodiment" or "certain embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical component, characterized in that: include: a first micro-optical device and a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a beam splitter prism, and a second micro-optical device arranged in sequence along the incident direction of the light path; Wherein, the first micro-optical device is arranged in the direction of the light refracted by the beam splitter prism; the beam splitter prism is used to split the light beams in the visible light band and the near-infrared band, and the first micro-optical device and the second micro-optical device are used to construct an FP cavity that realizes the wavelength selection function; The fifth lens and the sixth lens form a first doublet lens group, and the seventh lens and the eighth lens form a second doublet lens group.

2. An optical component according to claim 1, characterized in that: The first lens, the second lens, the third lens and the fourth lens form a front lens combination; The ratio of the combined focal length of the front lens group to the total focal length of the optical component is -1.1.

64.

3. An optical component according to claim 2, characterized in that: The focal length ratio of the first lens and the front lens group is -4.

337.

4. An optical component according to claim 2, characterized in that: The focal length ratio of the second lens and the front lens group is 16.

549.

5. An optical component according to claim 2, characterized in that: The focal length ratio of the third lens and the front lens group is 5.

155.

6. An optical component according to claim 2, characterized in that: The focal length ratio of the fourth lens and the front lens group is -1.

084.

7. An optical component according to any one of claims 1 to 6, characterized in that: The fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens form a rear lens combination; The ratio of the combined focal length of the rear lens group to the total focal length of the optical component is 1.

428.

8. An optical component according to claim 7, characterized in that: The focal length ratio of the first double-cemented lens group and the rear lens group is 1.56, and the focal length ratio of the second double-cemented lens group and the rear lens group is -47.

789.

9. An optical component according to claim 7, characterized in that: The focal length ratio of the ninth lens and the rear lens group is 3.

243.

10. A spectral camera, characterized in that: comprising an optical component, a first sensor and a second sensor as claimed in any one of claims 1 to 9; The first sensor is disposed on an imaging surface of the first micro-optical device, and the second sensor is disposed on an imaging surface of the second micro-optical device.

Images