CN211406096U

CN211406096U - Hyperspectral imaging system

Info

Publication number: CN211406096U
Application number: CN202020245444.2U
Authority: CN
Inventors: 黄创文; 甄明亮
Original assignee: Shenzhen Haippi Nanooptical Technology Co ltd
Current assignee: Shenzhen Haippi Nanooptical Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-09-01
Anticipated expiration: 2030-03-03

Abstract

The utility model provides a high spectrum imaging system, including camera lens subassembly, light filter switch, imaging chip and circuit board, the light filter switch sets up in the rear end of camera lens subassembly, and the light filter switch forms the cavity that is used for holding imaging chip with the circuit board, and adjustable filter is fixed in on the circuit board. The utility model discloses a high spectrum imaging system subassembly simple structure is compact, and the appearance is light and handy, has realized the miniaturized product design of high spectrum imaging, is particularly useful for mobile device application, can switch over the light filter simultaneously, obtains better formation of image picture and spectral curve, can obtain better effect.

Description

Hyperspectral imaging system

Technical Field

The utility model belongs to high spectral imaging detection area, concretely relates to high spectral imaging system.

Background

With the development of the 5G technology, the internet of things is exploded, and meanwhile, electronic products are also continuously updated, and under the scientific and technological environment, various novel electronic products will appear in the future.

The volume of a common hyperspectral imager on the market is very large, the common hyperspectral imager is not suitable for being used in small electronic products, and the common hyperspectral imager is fixed in a certain spectrum and has no switchable optical filter. When the white light intercepts light of different wave bands on the tunable filter device, the light of other wave bands cannot be completely transmitted.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that prior art exists, the utility model provides a hyperspectral imaging system has realized the miniaturized product design of hyperspectral imaging, can switch over the light filter simultaneously, can obtain better formation of image picture and spectral curve, reaches better effect to can let the consumer have better experience above the consumer electronics product.

The embodiment of the application provides a hyperspectral imaging system, including camera lens subassembly, light filter switch, imaging chip and circuit board, the light filter switch sets up in the rear end portion of camera lens subassembly, and the light filter switch forms the cavity that is used for holding imaging chip with the circuit board, and adjustable filter device is fixed in on the circuit board. This high spectrum imaging system simple structure, whole module small in size is fit for being used for miniaturized camera lens subassembly very much, portable, and the practicality is stronger.

Preferably, the filter switcher is provided with an inner groove for accommodating at least two filters, and the filters are movably arranged in the inner groove. The switching of the optical filter can obtain a wider hyperspectral waveband and a more accurate hyperspectral waveband.

Preferably, the optical filter switcher comprises a base, a motor and a mirror base, wherein the motor is arranged in the base, and the mirror base is arranged above the base. The base can be better fixed with microscope base and micro motor, prevents that micro motor from being collided and damaged.

Preferably, the inner groove is provided with a slide rail, and the filter is arranged on the slide rail through a bracket. The support is mainly used for supporting the optical filter and can better fix the optical filter.

Preferably, the circuit board comprises a first circuit board and a second circuit board, the first circuit board is provided with a control circuit, the micro motor is connected with the control circuit through a lead, and the motor is connected with the support through a transmission mechanism. The control circuit drives the transmission mechanism by controlling the micro motor, and the transmission mechanism controls the bracket to realize switching of different required optical filters.

Preferably, the center of the lens base is provided with a light through hole, and the light through hole is provided with an internal thread. The internal thread of the lens base is matched and fixed with the thread of the lens, and the center of the optical filter positioned on the light path is parallel to the light through hole, so that the optical filter can fully filter light.

Preferably, a clamping groove is formed in one end, facing the base, of the mirror base, and the base is clamped and fixed with the clamping groove. The lens seat is mainly used for fixing the lens assembly.

Preferably, the lens assembly comprises a focusing lens, and the focusing lens is fixed on the inner ring of the lens base by means of thread fixing and/or glue adhesion. The lens base is a fixed focus lens base and can also be a voice coil motor, the lens base has an automatic focusing function, and the position of the lens can be adjusted through the voice coil motor, so that a clearer image is presented.

Preferably, the lens assembly further includes a first lens barrel and a second lens barrel, the center of the first lens barrel is provided with the collimating lens, and the center of the second lens barrel is provided with the focusing lens. The collimating lens is mainly used for collimating light rays, the focusing lens is mainly used for focusing the light rays on the imaging chip, and the first lens barrel and the second lens barrel are mainly used for sealing the adjustable light filtering device and fixing the lens.

Preferably, the imaging chip is provided on the first wiring board, and the imaging chip is fixed to the rear end portion of the focus lens through the first wiring board. The imaging chip may be a highly sensitive CCD or CMOS chip, which mainly converts the image into electrical signals.

Preferably, the tunable filter device is disposed on the center hole of the second substrate, and the tunable filter device is disposed on the optical path between the collimator lens and the focusing lens. The second circuit board supplies power to the tunable optical filter device and controls the operation of the tunable optical filter device.

Preferably, the tunable optical filter device is mounted on the imaging chip via an elevating plate. The heightening sheet mainly heightens the tunable optical filter device, so that the imaging chip does not collide with the tunable optical filter device.

The utility model provides a high spectrum imaging system mainly includes parts such as light filter switch, camera lens subassembly, imaging chip, tunable filter and circuit board. When light (object image) passes through the collimating lens, different refractions are generated in the collimating lens to enable the light to come out vertically as much as possible, the light passes through the adjustable light filtering device and the focusing lens after coming out from the lens, finally the light is focused on an imaging surface of the imaging chip and transmitted to an external processor through the imaging chip, before the light is focused, the light can pass through the light filter switcher, and the light filter switcher can automatically switch the light according to different external electric signal inputs. The hyperspectral imaging system is simple in structure, small in appearance, easy to install, capable of switching the optical filters, very suitable for products (such as cameras and cameras) needing portable hyperspectral imaging, and suitable for other fields.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the invention. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

Fig. 1 is a cross-sectional view of a hyperspectral imaging system according to a first embodiment of the invention;

fig. 2 is a schematic diagram of a filter switcher of a hyperspectral imaging system according to an embodiment of the invention;

fig. 3 is a cross-sectional view of a filter switcher of a hyperspectral imaging system according to an embodiment of the invention;

fig. 4 is a cross-sectional view of a hyperspectral imaging system according to a second embodiment of the invention;

FIG. 5 is a front view of a hyperspectral imaging system according to a second embodiment of the invention;

fig. 6 is a spectral diagram of a tunable optical filter arrangement of a hyperspectral imaging system according to an embodiment of the invention;

fig. 7a-d are spectrograms of different filter states of a hyperspectral imaging system according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The present invention will be described in detail with reference to fig. 1, and the first embodiment of the present invention provides a hyperspectral imaging system, which includes a lens assembly, a light filter switcher 110, an imaging chip 111 and a circuit board 112, wherein the light filter switcher 110 is disposed at the rear end of the lens assembly, the light filter switcher 110 and the circuit board 112 form a cavity for accommodating the imaging chip 111, and the tunable filter device 106 is fixed on the circuit board 103. This high spectrum imaging system simple structure, whole module small in size is particularly suitable for being used for miniaturized lens subassembly, portable relies on setting up of light filter switch can further obtain better formation of image picture and spectral curve in addition.

Fig. 2 shows the schematic diagram of the optical filter switcher of the hyperspectral imaging system according to the embodiment of the present invention, as shown in fig. 2, the center of the lens holder 1105 is provided with the light through hole, and the light through hole is provided with the internal thread, and the internal thread of the lens holder 1105 is fixed with the screw thread of the focusing lens 108. The mirror base 1105 is provided with a slot towards one end of the base 1104, and the base 1104 is fixed in the slot. The lens base 1105 fixes the focusing lens 108 and the filter switcher 110 together, and the lens base 1105 is located at the center of the filter on the light path and parallel to the light-passing hole, so that the filter can achieve the effect of fully filtering light.

In a specific embodiment, the optical filter includes a first optical filter 1091 and a second optical filter 1092, and the first optical filter 1091 and the second optical filter 1092 are fixed on the support 1102 side by means of glue. The first filter 1091 is a long wavelength filter with spectral characteristics of 400nm, the second filter 1092 is a short wavelength filter with spectral characteristics of 700nm, and the filters intercept light in an unwanted wavelength band and prevent the light from passing through the unwanted wavelength band. In other optional embodiments, the spectral characteristics of the optical filter are not limited to this, and the spectral characteristics of the 400nm long-wavelength optical filter and the 700nm short-wavelength optical filter are most preferable according to different spectral characteristics required by the product, and optical filters with other wavelengths can be selected according to actual needs, so as to achieve the technical effects of the present invention.

Fig. 3 shows a cross-sectional view of the optical filter switcher of the hyperspectral imaging system according to an embodiment of the present invention. The micro motor 1101 is connected with the control circuit through a lead 1103, the micro motor 1101 is connected with the support 1102 through the transmission mechanism, and the optical filter is arranged on the slide rail through the support 1102. The micro motor 1101 drives the transmission mechanism according to the instruction of the control circuit, and the transmission mechanism controls the support 1102 to move in parallel on the slide rail, so that the required switching of different optical filters is realized. The holder 1102 is mainly used to support and fix the filter.

In a specific embodiment, the micro-motor 1101 is disposed within the base 1104, and the micro-motor 1101 is secured within the base 1104 by glue, adhesive, or the like. The base 1104 is mainly used for fixing the micro motor 1101 and the optical filter, and preventing the micro motor 1101 and the optical filter from being damaged due to vibration. Alternatively, the drive portion may be a motor, electromagnetic or other power source.

In a specific embodiment, the lens assembly includes a first barrel 102 and a second barrel 107, the first barrel 102 is provided with a collimating lens 101 at the center, and the second barrel 107 is provided with a focusing lens 108 at the center. The collimator lens 101 and the first barrel 102 may be formed integrally or may be formed as two parts. The collimating lens 101 is provided with an external thread, the first barrel 102 is provided with an internal thread, and the collimating lens 101 is fixed on the first barrel 102 by means of thread fixing and/or glue bonding. The collimator lens 101 may be used to collimate the light, so that the light (object image) enters the tunable optical filter device 106 as vertically as possible when passing through the collimator lens 101.

In a specific embodiment, the focus lens 108 and the second barrel 107 may be made as a single body or as two parts. The focus lens 108 is provided with an external thread, the second barrel 107 is provided with an internal thread, and the focus lens 108 is fixed on the second barrel 107 by means of thread fixing and/or glue adhesion. The focusing lens 108 is used for focusing light onto the imaging chip 111.

In a specific embodiment, the circuit boards include a first circuit board 103 and a second circuit board 112, and the first circuit board 112 is provided with a control imaging chip circuit. A protrusion is arranged at one end of the second cavity facing the first barrel 102, the second circuit board 103 is erected on the protrusion, a through hole for passing a light path is arranged in the middle of the second circuit board 103, electronic devices for driving the tunable filter device 106 are distributed around the through hole, the tunable filter device 106 is arranged on the through hole of the second circuit board 103, and the tunable filter device 106 is arranged on the light path between the collimating lens 101 and the focusing lens 108. The tunable optical filter device 106 is connected to the second circuit board 103 by means of wire conduction and glue fixation, and the second circuit board 103 mainly supplies power to the tunable optical filter device 106 and controls the operation of the tunable optical filter device 106. The light enters the focusing lens 108 through the tunable filter 106, the focusing lens 108 focuses the light on the imaging surface of the imaging chip 111, and the light passes through the filter 109 before being focused. Alternatively, the protruding portion may be disposed at one end of the second barrel 107 in the sealed cavity, the fixing manner between the tunable filter device 106 and the second circuit board 103 may also be a corresponding pad designed at the bottom of the tunable filter device 106 and the second circuit board 103, and the pad is electrically conductive and fixed through solder or conductive adhesive, which may also achieve the technical effects of the present invention.

In a specific embodiment, a connector 104 is disposed on the second circuit board 103, the connector 104 is connected to a flexible circuit board 105, and the flexible circuit board 105 is connected to the outside via a channel in the first barrel 102 or the second barrel 107 or a channel between the first barrel 102 and the second barrel 107. The second wiring board 103 is connected to a flexible wiring board 105 through a connector 104, and the second wiring board 103 is connected to the outside through the flexible wiring board 105. Alternatively, the second circuit board 103 and the flexible circuit board 105 may also be integrated into a whole or connected through pins, so as to achieve the technical effects of the present invention.

In a specific embodiment, the lens module further includes an imaging chip 111 disposed at the optical rear end of the lens module, the imaging chip 111 is disposed on the first circuit board 112, and the imaging chip 111 is fixed to the rear end of the focus lens 108 through the first circuit board 112. The imaging chip 111 is fixed to the first circuit board 112 by means of solder conduction, and the first circuit board 112 is fixed to the rear end portion of the focus lens 108 by means of screw fixation and/or glue adhesion. The imaging chip 111 may be a high-sensitivity CCD or CMOS chip. The light enters the imaging chip 111 after passing through the light filtering sheet, the imaging chip 111 can capture single-waveband two-dimensional image information and spectral information of each pixel, the image information and the spectral information are transmitted to the external processor through electric signals, the external processor integrates a plurality of pieces of two-dimensional image information and spectral information into a photo and a spectral curve according to an algorithm, and finally relevant application and analysis are carried out according to the spectral curve.

Fig. 4 shows a cross-sectional view of a hyperspectral imaging system according to a second embodiment of the invention, and as shown in fig. 4, the lens assembly includes a focus lens 108, and the focus lens 108 is fixed on the inner ring of the lens holder 1105 by means of screw fixation and/or glue adhesion. The lens base 1105 is generally configured as a fixed focus lens base, and preferably, may be configured as a voice coil motor, and the position of the lens may be adjusted through the auto-focusing function of the voice coil motor, so as to present a clearer image.

In a specific embodiment, the periphery of the imaging chip 111 is provided with a padding sheet 401, and the tunable optical filter device 106 is mounted on the imaging chip 111 through the padding sheet 401. The tunable optical filter 106 is fixed on the step-up sheet 401 by glue adhesion, the step-up sheet 401 is fixed on the first circuit board 112 by glue adhesion, and the tunable optical filter 106 is connected with the first circuit board 112 by means of wire conduction. Alternatively, the fixed mode of bed hedgehopping piece 401 and tunable filter 106 and first circuit board 112, also can be tunable filter 106 and first circuit board 112 bottom design has the pad, and bed hedgehopping piece 401 both sides all design has corresponding pad, and it is electrically conductive fixed through soldering tin or conducting resin between the pad, equally can realize the technical effect of the utility model.

Fig. 5 shows a front view of a hyperspectral imaging system according to a second embodiment of the invention, as shown in fig. 5, the first circuit board 112 includes a mirror base 1105 setting area and an electronic component placing area 402, and the electronic component placing area 402 is located beside the mirror base 1105 setting area. The electronic component placement area 402 includes a plurality of electronic components, and is mainly a space for placing the electronic components that drive the tunable optical filter device 106 and the imaging chip 111, and the space can be designed into different structures according to the requirements of the module, and the number of the electronic components shown in fig. 5 is not the total number. The imaging system further comprises an FPC board 403, the whole module is connected with the outside (such as a mobile phone mainboard) through the FPC board 403, and the wire outlet position of the FPC board 403 can be set according to the structural requirement of the module.

Fig. 6 shows the spectral effect diagram of the tunable filter device of the hyperspectral imaging system according to an embodiment of the present invention, as shown in fig. 6, when light enters the tunable filter device, the tunable filter device emits light of different wave bands according to different electrical signal inputs to make it penetrate, and 3 or more wave crests can be generated.

Fig. 7a-d show spectrograms of the hyperspectral imaging system of an embodiment of the invention in different filter states. When only one filter is disposed in the optical path of the system, the wavelength band transmitted by the filter shown in fig. 7a or fig. 7b is generated when light passes through the filter, the filter in fig. 7a only allows the peak 2 to pass through, and the filter in fig. 7b allows the peaks 1 and 2 or more peaks to pass through, so different disadvantages are generated when only one filter is disposed. When the optical path of the system is provided with the optical filter which only takes one wave peak, the wave band in the optical filter can be transmitted, but the transmitted wave band is very narrow, so that the requirements of most customers and applications are difficult to meet. If the optical filter with a plurality of wave crests is arranged in the optical path of the system, the transmitted wave band can be very wide, but the wave crests can interfere with each other, so that the imaging and spectral curve effects are poor.

As shown in fig. 7c, an optical filter switcher is added to the imaging system, that is, one optical filter shown in fig. 7c is added, and different optical filters are used when different wave crests are needed, so that the photographable wave bands can be widened without sacrificing the effect, that is, the wave bands can be changed from the prior wave band in which only the wave crest 2 can be penetrated into the wave bands of the wave crests 1 and 2, and the above problems can be effectively solved.

As shown in fig. 7d, if a very narrow band filter is added at the other end of the filter switcher 110, after the test is completed with the filter shown in fig. 7a, the very narrow band filter is switched to the imaging system, and through comparison of the two effects, it can be known whether the light in the band split by the tunable filter device 106 is accurate, and the tunable filter device has a light splitting function.

The utility model provides a hyperspectral imaging system mainly includes parts such as lens subassembly, light filter switch 110, imaging chip 111, tunable optical filter device 106 and circuit board. When light (object image) passes through the collimating lens, different refractions are generated in the collimating lens to enable the light to come out vertically as much as possible, the light passes through the adjustable optical filter device 106 and the focusing lens after coming out of the lens, finally the light is focused on an imaging surface of the imaging chip 111 and transmitted to an external processor through the imaging chip 111, before focusing, the light can pass through the optical filter switcher 110, and the optical filter switcher 110 can realize switching according to different external electric signal inputs. The hyperspectral imaging system is simple in structure, small in appearance, easy to install, capable of switching the optical filters, very suitable for products needing portable hyperspectral imaging, and also suitable for other fields.

While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the above-described embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details in the embodiments do not constitute the limitations of the scope of the present invention, and any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all fall within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a hyperspectral imaging system, its characterized in that, includes camera lens subassembly, light filter switch, tunable filter device, imaging chip and circuit board, the light filter switch set up in the rear end portion of camera lens subassembly, the light filter switch with the circuit board forms and is used for holding imaging chip's cavity, tunable filter device is fixed in on the circuit board.

2. The hyperspectral imaging system of claim 1, wherein the filter switch is provided with an inner groove for receiving at least two filters, the filters being movably disposed in the inner groove.

3. The hyperspectral imaging system of claim 2, wherein the filter switch comprises a base, a motor and a mirror mount, the motor is disposed within the base, and the mirror mount is disposed above the base.

4. The hyperspectral imaging system of claim 3, wherein a slide rail is disposed in the inner groove, the filter being disposed on the slide rail by a bracket.

5. The hyperspectral imaging system according to claim 4, wherein the circuit board comprises a first circuit board and a second circuit board, the first circuit board is provided with a control circuit, the motor is connected with the control circuit through a lead, and the motor is connected with the bracket through a transmission mechanism.

6. The hyperspectral imaging system according to claim 3, wherein the center of the lens holder is provided with a light through hole, and the light through hole is provided with an internal thread.

7. The hyperspectral imaging system according to claim 3, wherein a clamping groove is formed in one end, facing the base, of the microscope base, and the base is clamped and fixed with the clamping groove.

8. The hyperspectral imaging system according to claim 5, wherein the lens assembly comprises a focus lens, and the focus lens is fixed on an inner ring of the lens base by means of thread fixing and/or glue bonding.

9. The hyperspectral imaging system according to claim 8, wherein the lens assembly further comprises a first lens barrel and a second lens barrel, the first lens barrel is provided with a collimating lens at the center, and the second lens barrel is provided with the focusing lens at the center.

10. The hyperspectral imaging system according to claim 9, wherein the imaging chip is arranged on the first circuit board, and the imaging chip is fixed at the rear end of the focusing lens through the first circuit board.

11. The hyperspectral imaging system of claim 9, wherein the tunable optical filter device is disposed on the central hole of the second circuit board, and the tunable optical filter device is disposed on an optical path between the collimating lens and the focusing lens.

12. The hyperspectral imaging system according to any of claims 1 to 8, wherein the tunable optical filtering device is mounted on the imaging chip by an elevating plate.