System for focusing an imaging device

Abstract

An imaging device including an image sensor and a lens. In one aspect, the system includes a focusing mechanism configured to selectively adjust the distance between the image sensor and the lens of the imaging device to relatively position the image sensor and the lens at a distance selected from a first distance at which the lens is proximal to the image sensor, a second distance at which the lens is remote from the image sensor, and intermediate distances therebetween, to focus the imaging device; and an applicator configured to apply a bonding agent to the imaging device. In another aspect, the method includes adjusting a distance between the image sensor and the lens to adjust the focus of the imaging device.

Description

SYSTEM FOR FOCUSING AN IMAGING DEVICECROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from United States Patent Application No. 63 / 665365 filed on 28 June 2024, entitled “System for focusing an imaging device”, the entire contents of which is incorporated herein by reference.FIELD

[0002] Embodiments of the present disclosure relate generally to systems for focusing an imaging device, such as an imaging device suitable for use on agricultural machinery. Embodiments of the present disclosure also relate generally to imaging devices and methods of focusing an imaging device.BACKGROUND

[0003] Agricultural machinery of various types may include imaging devices. These imaging devices may be used for to identify rows of crops. In some applications, imaging devices may be used as part of row guidance systems to steer a machine or implement. For example, spraying devices may include imaging devices. Spraying devices are commonly used to apply water, fertilizer, and other liquids to soil and crops. Many spraying devices are connected to a vehicle and are configured to provide a supply of liquid as the vehicle moves through a field. Equipment manufacturers may provide an imaging system either as part of the spraying device or mounted on a vehicle and in communication with the spraying device. The imaging system may involve a camera that provides visual feedback during application of liquid in a field, to allow the operator to selectively apply liquid at required locations, and to avoid spraying in other areas.

[0004] Other agricultural tools can also benefit from an associated imaging system. For example, a seed planting device may ordinarily be configured to provide a continuous stream of seed during operation. Imaging systems may be used in conjunction with seed planting devices to allow for selective dispensing of seed in required locations (e.g. in seed furrows, or other prepared soil) and to avoid wastage by dispensing seed in sub-optimal locations for growing.

[0005] Generally, such imaging devices comprise at least an image sensor and an associated lens to capture images of a target and have a fixed focal length. Assembly of the imaging device can be laborious. During assembly, the lens or lenses may be adjusted to focus the imaging device. That is, the lens may be positioned such that the focal point is in the same plane as the imagesensor. The focus may be adjusted to ensure that images obtained have a good image quality, depending on the particular task or implementation. For example, during spraying operations, it is useful to obtain clear images of plants, weeds, and / or soil, to determine whether an area requires weed treatment, watering, or the application of fertilizer. For seed planting operations, it is useful to obtain clear images of a seed bed or furrow, to determine the optimal location to dispense seed.

[0006] With current systems, the focusing operation for the imaging device may be performed manually. Focusing of the imaging device may be performed by hand, such as by moving the lens towards or away from the imaging sensor, whilst viewing a series of images captured and output by the imaging device.

[0007] In addition, typically, once the lens has been positioned, fixing the lens in the desired position is also completed manually. For example, screws may be used to secure a lens mount in the desired position. However, during fixing of the lens position, it is not uncommon for the lens to be moved out of the desired position as fasteners are tightened. It can then be necessary to remedy the position of the lens before completing assembly of the imaging device for use. Alternatively, there is a risk of an imaging device being installed with a sub-optimal focus.

[0008] If unclear images are relied upon, this can result in poor equipment performance, such as the incorrect application of liquid material or seed. For example, if the system relies on a blurry or out-of-focus image, this can lead to the application of seed in an undesirable location (e.g., outside of a seed furrow), or the application of herbicide to a weed-free area, or non-application of herbicide to a weed infested area.

[0009] It is desirable to address or ameliorate one or more disadvantages or shortcomings associated with existing methods of focusing an imaging device, such as an imaging device for use in agricultural machinery, or at least to provide a useful alternative thereto. It may be desirable to utilise new methods of fixing a lens into a desired position, while reducing the risk of the lens moving out of the desired position during fixing. Also, it may be desirable to automate one of more of the configuration steps, in order to reduce the impact of user error and to avoid the imaging device being fixed at an incorrect or sub-optimal focus. This may allow a fixed focus imaging device to be configured that provides higher quality images, and which may allow the operator to apply liquid, seed or other material to a field at the correct locations.BRIEF SUMMARY

[0010] Disclosed herein is a system for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the system comprises: a movement mechanism configured to adjust the distance between the image sensor and the lens of the imaging device, to focus the imaging device; an applicator configured to apply a bonding agent to the imaging device, said bonding agent for preventing movement of the lens relative to the image sensor, to fix the imaging device in focus.

[0011] In a first aspect, there is provided a system for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the system comprises: a focusing mechanism configured to selectively adjust the distance between the image sensor and the lens of the imaging device to relatively position the image sensor and the lens at a distance selected from a first distance at which the lens is proximal to the image sensor, a second distance at which the lens is remote from the image sensor, and intermediate distances therebetween, to focus the imaging device; an applicator configured to apply a bonding agent to the imaging device, said bonding agent for preventing movement of the lens relative to the image sensor, to fix the imaging device in focus at the selected distance.

[0012] In some embodiments, the applicator is configured to apply bonding agent to a mounting ring of a lens housing that receives a lens mount comprising the lens of the imaging device. The mounting ring may comprise a plurality of teeth in a castellated configuration, and wherein the applicator is configured to apply bonding agent between adjacent teeth of the plurality of teeth.

[0013] In some embodiments, the bonding agent is an ultraviolet-curable adhesive or a photo- curable adhesive, and the system comprises an ultraviolet curing device or a photo-curing device. The ultraviolet curing / photo-curing device may comprise a plurality of probes, said probes arranged to expose bonding agent to ultraviolet radiation / light at equidistant intervals around the lens. In some embodiments, the probes are rotatable relative to the lens. That is, in some embodiments are configured to move between two or more positions around the lens. The curing device may be configured so that the probes can expose the bonding agent to radiation from each of the two or more positions and, in some cases, intermediate positions therebetween.

[0014] In some embodiments, the ultraviolet curing device or photo-curing device is configured with a plurality of sources of radiation / light that are configured with to project the radiation / light onto the bonding agent. The number of sources and distance between each source and the location where the bonding agent is applied may be selected so that the plurality of sourcesprovides a generally uniform amount of radiation / light around the lens without rotating the sources of radiation / light around the lens. This number and position of the sources of radiation / light may be selected based on the beam angle or spread, so as to provide the desired amount and distribution of radiation / light around the lens during bonding.

[0015] In some embodiments, the ultraviolet curing device (or photo-curing device) is movable between: an operating position, in which the curing device is positioned adjacent to the imaging device; and a non-operating position, in which the curing device is positioned away from the imaging device. When in the operating position, the curing device is suitably located to expose bonding agent to the ultraviolet radiation or light.

[0016] In some embodiments, the system comprises a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism (movement mechanism) comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; a lens gear configured to releasably connect to a lens mount of the imaging device; and a drive belt operatively connected to the drive gear and the lens gear so that rotation of the drive gear effects corresponding rotation of the drive belt and the lens gear.

[0017] In some other embodiments, the system comprises a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; and a lens gear in a meshed connection with the drive gear and configured to rotate in conjunction with the drive gear, wherein the lens gear is configured to releasably connect to a lens mount of the imaging device.

[0018] In some embodiments, the shaft of the stepper motor comprises a threaded portion; the frame comprises a threaded opening; and wherein the threaded portion and the threaded opening have the same thread pitch.

[0019] The imaging device may comprise two or more lenses, each with a respective image sensor. That is, the imaging device may be a multi-lens imaging device. In some embodiments, the focusing mechanism is configured to adjust the distances between two or more lenses and two or more respective image sensors in a multi-lens imaging device; the applicator is configured to apply the bonding agent at a plurality of locations on the multi-lens imaging device, to prevent movement of each lens relative to its respective image sensor. The focusing mechanism isconfigured to adjust the distance between each lens and its respective image sensor independently.

[0020] In some embodiments, the system further comprises a primary controller operatively in communication with the focusing mechanism and the applicator, the primary controller configured to: operate the focusing mechanism to control adjustment of the distance between the lens and the image sensor; and operate the applicator to control application of the bonding agent to the imaging device.

[0021] In some embodiments, the primary controller is configured to: operate a second stepper motor to control rotation of the ultraviolet (UV) probes.

[0022] In some embodiments, the system further comprises an image processing module operatively in communication with the primary controller, wherein the image processing module is configured to analyse images captured using the imaging device and to transfer data to the primary controller.

[0023] In some embodiments, the system further comprises a secondary controller operatively in communication with the ultraviolet curing device, the secondary controller configured to operate the ultraviolet curing device to effect curing of the ultraviolet-curable adhesive.

[0024] In some embodiments, the imaging device, the focusing mechanism, and the applicator are movable relative to a fixed mounting plate. In some of these embodiments, the system comprises: a mounting frame, comprising the fixed mounting plate and an adjustable mounting plate connected thereto, wherein the adjustable mounting plate is positioned parallel to the fixed mounting plate and is configured to move towards and away from the fixed mounting plate; and an alignment frame configured to releasably receive the imaging device. In some embodiments, the system comprises a frame system, comprising: the mounting frame, comprising the fixed mounting plate and an adjustable mounting plate connected thereto, wherein the adjustable mounting plate is positioned parallel to the fixed mounting plate and is configured to move towards and away from the fixed mounting plate; and an alignment frame configured to releasably receive the imaging device.

[0025] In some embodiments, the adjustable mounting plate is connected to the fixed mounting plate by at least one biasing member, such that the adjustable mounting plate is biased away from the fixed mounting plate and is movable towards the fixed mounting plate against a biasing force exerted by the at least one biasing member.

[0026] The applicator may be configured to be movable along a first direction, and the alignment frame may be configured to be movable along a second direction perpendicular to the first direction. In some embodiments, the frame system comprises: a first rail; and a second rail that extends perpendicularly to the first rail; wherein the applicator is configured to mount to the first rail, such that the applicator is movable along the first rail, and the alignment frame is configured to mount to the second rail, such that the alignment frame is movable along the second rail.

[0027] The system may comprise a first actuator configured to move the applicator along the first direction; and a second actuator configured to move the alignment frame along the second direction. For example, in embodiments including the frame system, the frame system may comprise: a first actuator configured to move the applicator along the first rail; and a second actuator configured to move the alignment frame along the second rail.

[0028] In some embodiments, the system comprises: a drip tray, comprising at least one collecting vessel and at least one aperture, wherein: the drip tray is configured to be movable between an operative position and a non-operative position along a third direction, said third direction being perpendicular to each of the first and second directions; and at least one collecting vessel is aligned with the applicator when the drip tray is in the operative position, and at least one aperture is aligned with the applicator when the drip tray is in the non-operative position.

[0029] In some embodiments, the frame system comprises a third rail that extends perpendicularly to each of the first rail and the second rail; a drip tray, comprising at least one collecting vessel and at least one aperture, wherein the drip tray is configured to mount to the third rail; and a third actuator, configured to move the drip tray along the third rail between an operative position and a non-operative position; wherein the at least one collecting vessel is aligned with the applicator when the drip tray is in the operative position, and the at least one aperture is aligned with the applicator when the drip tray is in the non-operative position.

[0030] In some embodiments, the focusing mechanism comprises: a stepper motor; a rotation member operatively connected to a shaft of the stepper motor; a lens collet; and a drive belt operatively connected to the rotation member and the lens collet, so that rotation of the rotation member effects corresponding rotation of the drive belt and the lens collet.

[0031] In some embodiments, the lens collet and the stepper motor are mounted to the adjustable mounting plate.

[0032] In some embodiments, the lens collet comprises a sleeve configured to receive a lens mount comprising the lens of the imaging device, so that rotation of the lens collet effects corresponding rotation of the lens mount to adjust the distance between the image sensor and the lens of the imaging device. In some other embodiments, the lens collet may be substituted by another lens receptacle suitable for receiving the lens mount so that it can be gripped or clasped by the receptacle so that rotation of the receptacle effects rotation of the lens mount. The lens collet (or other lens receptacle) can grip or clasp, such as by being dimensioned to that the lens mount is force-fit into the collet or receptacle, so that the lens mount can be reliably rotated by rotating the collet or receptacle and also ready removal of the lens mount can be permitted.

[0033] The lens collet or lens receptacle may comprise one or more contact surfaces for enhancing gripping of the lens mount when it is positioned in the collet / receptacle. The contact surface(s) generally create a higher coefficient of friction to facilitate concurrent rotation of the lens mount and collet / receptacle. The contact surface(s) may comprise an elastomeric material (e.g. a synthetic rubber). One or more of the contact surfaces may be provided by a coating on a part of the collet / receptacle. The coating may be a non-slip coating, such as a PVC coating. Alternatively or additionally, one or more contact surfaces may be provided by a layer or member disposed between the lens mount and the main body of the collet / receptacle. The layer or part may be adhered or otherwise fixed to the collet / receptacle. Alternatively, the layer or part may be a discrete component. One or more contact surfaces may be configured to abut a side surface. Alternatively or additionally, one or more contact surfaces may be configured to abut an end surface of the mount, such as a face ending around the perimeter of the lens. A contact surface may be provided by a non-slip gasket. In some embodiments, a contact surface is provided by an O-ring located within the collet / receptacle.

[0034] After bonding, the imaging device including the lens may be retracted to remove (e.g. pull out) the lens mount from the collet or receptacle.

[0035] As mentioned above, in some embodiments, the bonding agent is an ultraviolet-curable adhesive or a photo-curable adhesive, and the system comprises an ultraviolet curing device or a photo-curing device. In some embodiments, the curing device may be mounted to the adjustable mounting plate. The curing device may comprise a plurality of radiation / light sources (e.g. ultraviolet sources) arranged to expose the bonding agent to radiation at equidistant intervals around the lens.

[0036] In some embodiments, the system comprises a control module operatively in communication with the imaging device, the focusing mechanism, and the applicator.

[0037] In some embodiments, the control module is operatively in communication with the first actuator and the second actuator.

[0038] In some embodiments, the control module is operatively in communication with the third actuator.

[0039] In some embodiments, the control module is operatively in communication with the curing device.

[0040] In a second aspect, there is provided a method for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the method comprises: adjusting the distance between the image sensor and the lens to adjust the focus of the imaging device; determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens; and preventing movement of the lens relative to the image sensor by fixing the position of the lens using a bonding agent.

[0041] In this context, the term “substantially aligned” should be understood to be an alignment of the image sensor and the focal point of the lens such that an acceptable image quality is obtained. “Substantially aligned” does not necessarily mean precise or perfect alignment of the image sensor and the focal point of the lens. A substantial alignment may be an alignment such that the image quality meets a desired image quality or threshold image quality, which may be based, for example, on user identification of the image quality of a captured image. In a manually operated system, substantial alignment of the image sensor and the lens focal point may be determined based on user identification of the image quality of one or more captured images (e.g., selecting the highest quality image from a series of images, or visually determining that the image quality is sufficient for a particular task). In automated systems, substantial alignment of the image sensor and the lens focal point may be determined by capturing and analysing a series of images and automatically determining which image or images provide the optimal image quality.

[0042] In some embodiments, determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens comprises: capturing a plurality of images of a target object via the imaging device during adjustment of the distance between the image sensor and the lens; analysing the plurality ofimages; determining an optimal image of the plurality of images of the target object; and controlling the adjustment of the distance between the image sensor and the lens to position the image sensor and the lens at the distance associated with the optimal image.

[0043] In some embodiments, the method comprises applying the bonding agent to the imaging device before adjustment of the distance between the image sensor and the lens. Alternatively, or additionally, in some embodiments, the method comprises applying bonding agent to the imaging device during adjustment of the distance between the image sensor and the lens. Alternatively, or additionally, in some embodiments, the method comprises applying bonding agent to the imaging device after adjustment of the distance between the image sensor and the lens.

[0044] In some embodiments, the bonding agent is an ultraviolet-curable adhesive; and fixing the position of the lens using the bonding agent comprises curing the ultraviolet-curable adhesive.

[0045] In some embodiments, the method further comprises, selectively: moving the ultraviolet curing device to an operating position adjacent to the imaging device for curing of the ultraviolet-curable adhesive; and moving the ultraviolet curing device to a non-operating position away from the imaging device.

[0046] As with the first aspect, in some embodiments of the second aspect, the imaging device may be a multi-lens imaging device. In some embodiments, the imaging device comprises two or more lenses and two or more respective image sensors and, for each lens of the device, the method comprises: adjusting the distance between said lens and said lens’s respective image sensor to adjust the focus of the imaging device; determining that the distance between said lens and said lens’s respective image sensor is such that the image sensor is substantially aligned with the focal point of said lens; and preventing movement of said lens relative to said lens’s respective image sensor by fixing the position of the lens using a bonding agent.

[0047] In some embodiments, adjusting the distance between one of said two or more lenses and said lens’s respective image sensor is performed independently of adjusting the distance between another of said two or more lenses and said other lens’s respective image sensor.

[0048] In a third aspect of the invention there is provided an imaging device, comprising: an image sensor; and a lens positioned at a fixed distance from the image sensor; wherein the position of the lens relative to the image sensor is fixed using a bonding agent.

[0049] In a fourth aspect of the invention there is provided an imaging device, comprising an image sensor, a lens, a lens mount in which the lens in mounted and a lens housing configured to receive the lens mount; wherein either or each of the lens mount and lens housing have a plurality of retaining formations, said formations defining interstices configured to receive a bonding agent.

[0050] In some embodiments, the lens housing comprises a mounting ring configured to receive the lens mount and the mounting ring comprises retaining formations. The retaining formations may be a plurality of teeth in a castellated configuration.

[0051] This aspect includes embodiments of the imaging device in which the position of the lens relative to the image sensor has been fixed using the bonding agent, with the imaging device comprising bonding agent within the interstices.

[0052] In some embodiments, the imaging device is formed by the method according to the second aspect of the invention, or any one of the embodiments of the second aspect of the invention.

[0053] Within the scope of this application, it should be understood that the various aspects, embodiments, examples and alternatives set out herein, and individual features thereof may be taken independently or in any possible and compatible combination. Where features are described with reference to a single aspect or embodiment, it should be understood that such features are applicable to all aspects and embodiments unless otherwise stated or where such features are incompatible.BRIEF DESCRIPTION OF THE DRAWINGS

[0054] One or more embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0055] FIG. 1 is a simplified schematic showing components of an imaging device according to the present disclosure.

[0056] FIG. 2 is a perspective view of a portion of an imaging device according to the present disclosure.

[0057] FIG. 3A is a front view of a focusing system according to the present disclosure, including a curing device.

[0058] FIG. 3B is a front view of the focusing system of FIG. 3 A, with the curing device removed.

[0059] FIG. 4 is a perspective view of a focusing mechanism of the focusing system of FIG. 3.

[0060] FIG. 5 is a partial cross-sectional view of the focusing mechanism of FIG. 4.

[0061] FIG. 6 is a perspective view of part of the focusing mechanism of FIG. 4.

[0062] FIG. 7 is a perspective view of a bonding agent applicator of the focusing system of FIG.3 A.

[0063] FIG. 8 A is a perspective view of the curing device of the focusing system of FIG. 3 A.

[0064] FIG. 8B is a front view of the curing device of FIG 8 A.

[0065] FIG 8C is a further perspective view of the curing device of FIG. 8A.

[0066] FIG. 9 is a schematic showing the interaction between a control system and a focusing system according to the present disclosure.

[0067] FIG. 10 is a perspective view of part of an alternative focusing mechanism.

[0068] FIG. 11 is a partial cross-sectional view of the ultraviolet curing device of FIG. 3 A.

[0069] FIG. 12 is a perspective view of an alternative focusing system according to the present disclosure.

[0070] FIG. 13 is a perspective view of a part of a frame system of the focusing system of FIG.12.

[0071] FIG. 14 is a perspective view of another part of the frame system of the focusing system of FIG. 12, and a bonding agent applicator connected thereto.

[0072] FIG. 14B is a perspective view of the part of the frame system and bonding agent applicator shown in FIG. 14, with the bonding agent applicator is an alternative position.

[0073] FIG. 15 is a rear view of the bonding agent applicator shown in FIG. 14.

[0074] FIG. 16 is an enlarged view of a focusing mechanism of the focusing system of FIG. 12.

[0075] FIG. 17 is a perspective view of one side of the focusing mechanism of FIG. 16.

[0076] FIG. 18 is an enlarged view of a lens collet of the focusing mechanism of FIG. 15.

[0077] FIG. 19 is an enlarged view of a curing device of the focusing system of FIG. 12, illustrated in its position on the frame system.

[0078] FIGS. 20A and 20B each show a cross-section to the curing device of the focusing system of FIG. 12.

[0079] FIG. 21 is a schematic showing the interaction between a control system, a multi-lens imaging device, and the focusing system of FIG. 12.DETAILED DESCRIPTION

[0080] In the following detailed description, reference is made to accompanying drawings which form a part of the detailed description. The illustrative embodiments described in the detailed description, depicted in the drawings and defined in the claims, are not intended to be limiting. Other embodiments may be utilised and other changes may be made without departing from the spirit or scope of the subject matter presented. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the drawings can be arranged, substituted, combined, separated and designed in a wide variety of different configurations, all of which are contemplated in this disclosure.

[0081] Figure 1 shows a schematic illustration of an imaging device 10. The imaging device 10 comprises a housing 12, an image sensor 14 and a lens 16. The image sensor 14 is located at a fixed position within the housing 12 and the lens 16 is movable relative to the housing 12 and the image sensor 14. The lens 16 is housed within a lens mounting 18 which, in the illustrated embodiment, comprises a lens mount 20 and a mounting ring 22. The mounting ring 22 is part of the lens housing (remainder not shown) provided at a fixed position relative to the housing 12 and the lens mount 20 is movable with respect to the mounting ring 22, such that the lens 16 is movable towards or away from the image sensor 14.

[0082] The lens mount 20 comprises a circumferential lens holder 20a which retains the lens 16, and a body portion 20b having an exterior thread (not shown). The exterior thread of the body portion 20b engages with an interior thread of the mounting ring 22. Rotation of the lens mount 20 relative to the mounting ring 22 causes the circumferential lens holder 20a and the retained lens 16 to move towards or away from the image sensor, depending on the direction of rotation.

[0083] The imaging device 10 also comprises a processor (not shown), for implementing and / or controlling processes of the imaging device, including capturing images and storing images on an internal memory.

[0084] In accordance with the present disclosure, the lens may be fixed in a desired position using a bonding agent. The bonding agent may be an adhesive or resin, or similar material, suitable for bonding the lens mount to the lens housing so as to fix the lens in position. Suitable bonding agents can be selected based on the materials used for the lens mount and housing. Suitable bonding agents may include, but are not limited to, photo-curable resins and adhesives, UV-curable resins and adhesives, electron-beam curable resins or adhesives, solvent-based adhesives that may be cured or dried from a lower viscosity state to a high viscosity state,thermally-setting resins or adhesives, and thermoplastic resins or adhesives. Thermal curing bonding agents may cure at ambient temperature or at an elevated temperature. If cured at an elevated temperature, the temperature will be selected to avoid detrimentally affecting the imaging device. For example, the temperature may be in the range of 37-93°C (100-200°F).

[0085] In some embodiments, photo-curable / UV -curable bonding agents may be preferred. UV curable bonding agents may include, but are not limited to, urethanes acrylates, polyester acrylates, amino acrylates and epoxy acrylates. Bonding agents with dual-curing mechanisms may be particularly preferred. Such bonding agents can be both photo-curable / UV -curable and heat-curable. With such dual-during bonding agents, exposure to light / UV radiation may be used to cure visible portions of the bonding agent, while “shadowed” portions will cure via thermal curing mechanisms. The bonding agent may be selected from commercially available adhesive or resin products, such as Loctite® AA 352.

[0086] In some embodiments, either or each of the lens mount and lens housing may include a plurality of retaining formations, the interstice between adjacent formations providing a region that can be partially or completely filled with the bonding agent. After curing the bonding agent, the cured material in the interstices may generate mechanical locking that contributes to fixing the lens in the desired position. The retaining formation can be a series of protrusions, teeth or castellations. The cross-sectional profile of each formation may be selected to enhance fixing of the lens in position, once the interstices are partially or completely filled with cured bonding agent. Typically, the formations (and resulting interstices) are spaced at regular intervals so that bonding agent may be distributed around the lens mount in an even or balanced manner.

[0087] The lens mount and / or lens housing may be adapted for use with photo-curable / UV- curable bonding agents. Such adaptations can include providing open regions that can be partially or completely filled with the bonding agent, which can then be exposed to light / UV radiation to cure the bonding agent. Thus, in embodiments using retaining formations, the profile of the interstices may be such that bonding agent within the interstice can be exposed to light / UV radiation.

[0088] One example of a lens housing adapted for use with a photo-curable / UV -curable bonding agent is shown in Figure 2. In this embodiment, the mounting ring 22 comprises retaining formations (a plurality of teeth) 24, such that the lens housing has a castellated configuration.When focusing the imaging device 10, bonding agent can be applied to the lens mounting 18 and cured in the spaces between the teeth 24.

[0089] In some alternative embodiments, the exterior thread of the body portion 20b and the interior thread of the mounting ring 22 is absent. In some of these embodiments, a telescoping connection is provided, in which the diameter of the exterior part of the body portion 20b and the diameter of the interior part of the mounting ring 22 are selected to provide a close fit between the body portion 20b and the mounting ring 22. Thus, the body portion 20b may be moved with respect to the mounting ring 22 by application of a lateral force and, upon removal of the force, the body portion 20b will be retained in position due to frictional engagement between the body portion 20b and the mounting ring 22.

[0090] In some embodiments, the body portion of the lens mount may include open regions (e.g. surface patterning), so that when the photo-curable / UV -curable bonding agent is cured, mechanical locking can be generated to resist movement of the lens.

[0091] The bonding agent may be applied before, during and / or after adjusting the position of the lens. The timing of application may depend on the type of bonding agent selected and the gelling time / conditions of the bonding agent. The bonding agent may be applied before and / or during adjustment when the bonding agent has a suitable working life (“pot life”) to allow the adjustment process to be completed before the bonding agent cures. The adjustment process may be performed under conditions that avoid or minimise exposing the selected bonding agent to curing conditions to maximise available adjustment time.

[0092] In some embodiments, applying the bonding agent before and / or during adjustment may be advantageous. Depending on the viscosity and shear-thinning behaviour of the agent, the bonding agent may act as a lubricant to facilitate movement of the lens. Also, applying the bonding agent before and / or during adjustment may facilitate a substantially even distribution of bonding agent around the lens. In addition, applying the bonding agent prior to completing the adjustment of the position may reduce the risk of the application process adversely affecting the positioning of the lens. In some cases, applying the bonding agent after adjusting the position of the lens may have an increased risk that the application process may change the position of the lens, requiring re-adjustment.

[0093] In some cases, the bonding agent may be applied before and / or during adjustment when the bonding agent does not rely on photo-curing / UV -curing, or when a dual-curing bondingagent is used. Alternatively, in some embodiments, it may be acceptable for a photo-curable / UV - curable to be applied before and / or during adjustment, as sufficient bonding agent can still be exposed to light / UV -radiation to fix the lens in position, although some uncured agent may remain in the shadowed regions.

[0094] Figure 3 A shows an embodiment of a focusing system 100 according to an embodiment of the present invention. The focusing system 100 comprises a focusing mechanism 200 (a movement mechanism), a bonding agent applicator 300 and a curing device 400. Figure 3B provides a view of the focusing system 100 with the curing device 400 removed, to provide a clearer view of the focusing mechanism 200.

[0095] The focusing mechanism 200, when in use, is configured to effect adjustment of the distance between an image sensor 14 and a lens 16 of an imaging device, so as to ready the imaging device for installation and use. The focusing mechanism 200 is shown in isolation in Figure 4, to provide a clearer representation of the component parts of the focusing mechanism 200. The focusing mechanism 200 comprises a stepper motor 202, comprising a shaft 204 which is configured to rotate upon activation of the stepper motor 202. As shown in the cross-sectional view provided in Figure 5, the shaft 204 is received within a threaded sleeve 206. The threaded sleeve 206 comprises a threaded portion on its exterior surface, and the threaded sleeve 206 is mounted within a threaded opening 208 of a mounting frame 102. The threaded opening 208 has an internal thread with a corresponding thread pitch to the threaded portion of the threaded sleeve 206. Rotation of the shaft 204, during operation of the stepper motor 202, causes corresponding rotation of the threaded sleeve 206 within the threaded opening 208, such that the threaded sleeve 206 moves forward or rearward through the threaded opening 208.

[0096] It is alternatively envisaged that the shaft 204 may itself comprise an integral threaded portion that engages with a corresponding threaded opening of the frame 102. In such embodiments, a separate threaded sleeve is not required.

[0097] As shown in Figure 5, a distal portion of the threaded sleeve 206 is connected to a drive gear 210 having circumferential teeth 212. The distal portion of the threaded sleeve 206, in the illustrated embodiment, is received within a central aperture 214 of the drive gear 210. Rotation of the threaded sleeve 206 and the movement of the threaded sleeve 206 forward or rearward through the threaded opening 208 thereby effects both rotation of the drive gear 210, and forward or rearward movement of the drive gear 210.

[0098] The drive gear 210 is in a meshed engagement with a lens gear 216 having the same module. The lens gear 216 comprises circumferential teeth 218 that are meshed with the circumferential teeth 212 of the drive gear 210.

[0099] The lens gear 216 is configured, in use, to connect to the exterior of the circumferential lens holder 20a of the imaging device 10. As shown in Figure 6, the lens gear 216 is provided with internally projecting support members 220a-220c, which are configured to firmly engage with the circumferential lens holder 20a.

[0100] Rotation of the lens gear 216 effects rotation of the circumferential lens holder 20a and, in turn, rotation of the body portion 20b of the lens mount 20 relative to the mounting ring 22. In the illustrated embodiment, the external thread of the body portion 20b has the same thread pitch as the threaded sleeve 206, to ensure that forward or rearward movement of the threaded sleeve 206 (and corresponding forward or rearward movement of the drive gear 210) causes the same amount of forward or rearward movement of the lens gear 216 and the lens holder 20a. By using the same thread pitch, the drive gear 210 and the lens gear 216 remain correctly engaged during adjustment of the lens position.

[0101] In some other embodiments, the thread pitch of the threaded sleeve 206 and the threaded opening 208 may differ from the thread pitch of the body portion 20b and the mounting ring 22. For example, one of the drive gear 210 or the lens gear 216 may be configured to have a greater gear thickness, to allow the teeth to remain engaged without requiring the gears to move forward or rearward the same distance.

[0102] In some other embodiments, the focusing mechanism may comprise a linear actuator that is extendable or retractable to cause forward or rearward movement of the lens mount 20 relative to the mounting ring 22 (and, thus, forward or rearward movement of the lens 16 relative to the image sensor 14).

[0103] In some embodiments, the system comprises a pulley arrangement configured to perform a similar function to the gear train described above to cause rotation of the lens mount 20 relative to the mounting ring 22 and corresponding movement of the lens 16 towards or away from the image sensor 14.

[0104] An example of an embodiment including a pulley arrangement is shown in Figure 10. In this embodiment, a distal portion of the threaded sleeve 206’ is connected to a drive gear 210’ having circumferential teeth 212’. Movement of the threaded sleeve 206’ and the correspondingmovement of the drive gear 210’ is substantially the same as described above for threaded sleeve 206 and drive gear 210 (see Figures 4 and 5).

[0105] The drive gear 210’ is in a meshed engagement with a drive belt 222 having teeth 224. The drive belt 222 is also in a meshed engagement with a lens gear 216’. The lens gear 216’ is connected to the lens holder 20a around the circumference of the lens holder 20a. Rotation of the drive gear 210’ effects corresponding rotation of the drive belt 222 and, consequently, rotation of the lens gear 216’. Rotation of the lens gear 216’ effects rotation of the circumferential lens holder 20a and, in turn, rotation of the body portion 20b of the lens mount 20 relative to the mounting ring 22. In this embodiment, the external thread of the body portion 20b has the same thread pitch as the threaded sleeve 206, to ensure that forward or rearward movement of the threaded sleeve 206’ (and corresponding forward or rearward movement of the drive gear 210’) causes the same amount of forward or rearward movement of the lens gear 216’ and the lens holder 20a. By using the same thread pitch, the drive gear 210’, drive belt 222 and the lens gear 216’ remain correctly engaged during adjustment of the lens position.

[0106] As shown in Figure 7, the focusing system 100 also comprises a bonding agent applicator 300. The bonding agent applicator 300 comprises a vessel 302 for storing a bonding agent and a dispensing needle 304 for dispensing the bonding agent. The bonding agent applicator 300 is configured to apply a bonding agent to the imaging device 10. In some alternative embodiments, the dispensing needle 304 may be replaced by one or more spray nozzles, one or more brushes, and / or any other device suitable for dispensing the uncured agent.

[0107] The bonding agent applicator 300 may be mounted on a rail, or otherwise movably mounted, to aid the process of applying bonding agent to the imaging device. Alternatively, or additionally, the applicator 300 may comprise a plurality of dispensing needles, nozzles, or brushes. Alternatively, the focusing system 100 may comprise two or more bonding agent applicators 300, to allow bonding agent to be applied at different locations simultaneously.

[0108] The focussing system may comprise one or more curing devices or curing stations. The curing device(s) (or station(s)) will be configured depending on the type of bonding agent to be used. As such, the curing device(s) (or station(s)) may be configured to expose the bonding agent to: radiation, such as ultraviolet radiation, visible light, thermal radiation (e.g. infrared radiation, heat), electron radiation; a drying process such as exposure to a flow of air or heated air (or other suitable gas); and / or any other suitable curing process. When the bonding agent is a dual-curingagent, plural types of curing devices may be used e.g. exposure to ultraviolet radiation, visible light, or electron radiation, followed by exposure to thermal radiation (e.g. infrared radiation, heat).

[0109] Figures 8A-8C illustrate a curing device 400 which is part of the focusing system shown in Figure 3A. In this embodiment, the curing device 400 comprises four ultraviolet emitting probes 402a-402d mounted on a probe gear 404, although it will be appreciated that the curing device 400 can be replaced by a curing device configured of a different curing process.

[0110] In general, it can be desirable to cure the bonding agent in an even or balanced manner. During curing, bonding agents may shrink to some degree. In can be desirable to select bonding agents that have minimal shrinkage during curing. In addition, to mitigate against any shrinkage, it can be desirable to ensure that curing at any one point of the applied bonding agent is balanced by curing at another point at the same time. This can enable shrinkage forces in one direction to be balanced by shrinkage forces in the other direction during curing, so at to reduce the likelihood of any shrinkage effects altering the positioning of the lens after focusing the imaging device. In some embodiment, the curing device or station may be configured to expose substantially all bonding agent to curing conditions simultaneously. In some other cases, the curing device or station may be configured to expose one or more opposed pairs of regions of the bonding agent to curing conditions simultaneously. It will be appreciated that, to facilitate curing the bonding agent in an even or balanced manner, it is desirable to apply the bonding agent in an even or balanced manner.[OHl] In some embodiments, the curing device or station may be configured to expose one or more opposed pairs of regions of the bonding agent to curing conditions simultaneously and configured to move the exposure points around the lens mounting. The curing device or station may be configured to be moved to two or more locations around the lens mounting to facilitate relatively even or balanced curing of the bonding agent. In some embodiments, the curing device or station may be configured move stepwise through two or more positions at which a curing operation is performed. The curing device or station may be configured to perform a curing operation while rotating at a desired speed to effect curing along an arc around the lens mounting. That is, the curing may be performed as a continuous operation along the travel path of the probes. The curing device or station may be adapted so that the movement of the curingdevice or station can be selected to control the mode of the curing operation (e.g. stepwise movement or a continuous curing “sweep” across an arc).

[0112] In the illustrated embodiment, the probe gear 404 is rotatably mounted to a plate 406, whereby rotation of the probe gear 404 is facilitated by corresponding rotation of drive gear 408 and intermediate gear 410. Figure 11 provides a cross-sectional view of curing device 400 through the centre of the drive gear 408 (i.e., the horizontal plane aligned with the central axis A, shown in Figure 8C). As illustrated in Figure 11, the drive gear 408 is connected to a shaft 414 of a stepper motor 412. The stepper motor 412 is mounted to plate 406, although in alternative embodiments the stepper motor 412 could be mounted to the frame 102. Actuation of the stepper motor 412 causes rotation of the shaft 414 (see Figure 11) and corresponding rotation of the drive gear 408. In turn, rotation of the drive gear 408 effects rotation of the intermediate gear 410 and the probe gear 404. It will be appreciated that, in alternative embodiments, the intermediate gear 410 can be dispensed with, and the drive gear 408 can be directly meshed with the probe gear 404. In other alternative embodiments, the drive gear 408 can be connected to the probe gear 404 by way of a drive belt, such that rotation of the drive gear 408 effects rotation of the drive belt and, in turn, rotation of the probe gear 404.

[0113] In the illustrated embodiment, actuation of the stepper motor 412 effects rotation of the ultraviolet emitting probes 402a-402d. The rotation of the probes 402a-402d may allow UV radiation to be directed at all circumferential positions around the lens mounting 18, thus allowing the ultraviolet curable adhesive bonding agent to be cured around substantially the whole circumference of the lens mount 20 and the mounting ring 22. This may provide a more even curing of the ultraviolet curable adhesive bonding agent. The speed and degree of rotation may be selected to provide the desired curing conditions.

[0114] In this embodiment, the plate 406 is movably mounted (e.g. pivotably mounted) to the frame 102, such that the entire curing device 400 can be positioned in an operating position (as shown in Figure 3A) in which the UV probes 402a-402d are positioned adjacent to the imaging device 10, or in a non-operating position (not shown) in which the UV probes 402a-402d are distant from the imaging device 10. In the operating position, the UV probes 402a-402d are directed towards the imaging device such that the UV probes, when activated facilitate curing of an ultraviolet-curable adhesive bonding agent.

[0115] The plate 406 may be pivotably mounted to the frame 102, such that the plate 406 (and thereby, the UV probes 402a-402d) can be pivotally moved between an operating position adjacent the imaging device 10 or a non-operating position distant from the imaging device 10. In alternative embodiments, the plate 406 may be movable laterally with respect to the frame 102, to facilitate lateral (e.g. slidable) movement between the operating and non-operating positions, or may otherwise be movable towards or away from the frame 102.

[0116] In embodiments wherein the plate 406 is pivotably mounted to the frame 102, the plate 406 can be operatively connected to a separate stepper motor, similar to those described herein, which can be controlled to effect rotation of the plate 406 between operating positions and nonoperating positions.

[0117] In alternative embodiments, the ultraviolet emitting probes 402a-402d are slidably moveable, or otherwise moveable from the operating position to a non-operating position.

[0118] In some embodiments, fewer than, or more than, four UV probes can be provided, depending on the particular curing configuration required. Alternatively, the curing device 400 may comprise an ultraviolet emitting ring light mounted on the plate 406, or otherwise movably connected to the frame 102 to permit movement from an operating position to a non-operating position.

[0119] Some embodiments may include a curing device 400 that alternatively or additionally (depending on bonding agent) comprises a heating device, such as an infrared heater or resistance heater, which is movable from an operating position to a non-operating position. Multi-lens Imaging Devices

[0120] In some embodiments of the invention, the imaging device 10 comprises a stereoscopic lens system. In such embodiments, the housing 12 comprises first and second image sensors 14, 14’ and first and second lenses 16, 16’. The configuration of the second lens 16’ and second image sensor 14’ is as described above for the (first) lens 16 and the (first) image sensor 14.

[0121] In embodiments of the system configured for focussing multi-lens imaging devices, the movement of the second lens 16’ with respect to the second image sensor 14’ may be achieved using the same focusing mechanisms as described above for the (first) lens 16. Movement of the first lens 16 may be effected independently of movement of the second lens 16’, such that the distance between the first lens 16 and the first image sensor 14 can be adjusted independentlyfrom the adjustment of the distance between the second lens 16’ and the second image sensor 14’.

[0122] In multi-lens focussing systems, the bonding agent applicator 300 may comprise a plurality of dispensing needles 302 (or other suitable dispensing means, as described above). This allows the applicator 300 to dispense bonding agent onto first and second lens mountings 18, 18’ during the focusing operation. Alternatively, the focussing system may be provided with two separate bonding agent applicators 300 as described above, with one applicator 300 for each lens system.

[0123] In some embodiments of the multi-lens focussing system, the curing device 400 may be configured to move from a non-operating position to a first operating position in which bonding agent may be cured on the first lens mounting 18, and a second operating position in which bonding agent may be cured on the second lens mounting 18’. Alternatively, the multi-lens system may be provided with two separate curing devices 400 as described above, with one curing device 400 for each lens mounting 18, 18’. In some other embodiments, the curing device may be configured to cure the bonding agent applied to the lenses concurrently.

[0124] Another embodiment of a focusing system according to the present invention is illustrated in FIGS 12 to 20B. The focusing system 1100 comprises a focusing mechanism 1200 for adjusting a relative distance between the image sensors and the lenses of a multi-lens imaging device (e.g. the stereoscopic imaging device 10 described above). The focusing system 1100 comprises a bonding agent applicator 1300 which is movable relative to the multi-lens imaging device and configured to selectively dispense bonding agent thereto. Additionally, the focusing system 1100 comprises a curing device 1400 configured to effect curing of a bonding agent to fix an optimal distance between the image sensors and the lenses, after a focusing operation has occurred. In this embodiment, various components of the focusing system 1100 are movably mounted to a frame system 1600, such that the components can move relative to one another. In this illustrated embodiment, the frame system 1600 includes perpendicularly arranged rails 1610, 1614, 1618 so as to move components in the X-, Y- and Z- direction. However, the skilled person will appreciate that other forms of translatable plates, platforms and or jigs may be used in order to ensure the components are suitably movable relative to each other.

[0125] The frame system 1600 illustrated in Figure 13 comprises a primary frame 1602 having a fixed mounting plate 1604. The primary frame 1602 comprises an adjustable mounting plate1606, which is positioned parallel to the fixed mounting plate 1604 and connected thereto by a plurality of biasing members 1605 that are described further below.

[0126] The frame system 1600 comprises an alignment frame 1608, which is configured to receive the multi-lens imaging device. The multi-lens imaging device may be releasably clamped to the alignment frame 1608, using clamps 1609 prior to commencing the focusing operation. The alignment frame 1608 is movably connected to the fixed mounting plate 1604 by a plurality of connecting bars 1607, such that the adjustable mounting frame 1606 is positioned between the fixed mounting plate 1604 and the alignment frame 1608, as illustrated in Figure 13. The alignment frame 1608 is also mounted on a rail 1610 that extends horizontally (in the Y- direction), such that the alignment frame 1608 can be moved forwards and rearwards along the rail by operation of a linear actuator 1612.

[0127] As illustrated in Figures 14 and 15, the frame system 1600 comprises a rail 1614 that extends vertically (i.e., in the Z-direction). The bonding agent applicator 1300 is movably mounted to the rail 1614, such that the applicator 1300 can move upwards and downwards along the rail 1614. Movement of the bonding agent applicator 1300 along the rail is initiated by operation of a linear actuator 1616.

[0128] Additionally, the frame system 1600 comprises a rail 1618 that extends horizontally (in the X-direction). A drip tray 1310 is movably mounted to the rail 1618, such that the drip tray 1310 can move left and right along the rail. Movement of the drip tray 1310 along the rail 1618 is initiated by operation of a linear actuator 1620. The linear actuators 1612, 1616 and 1620 are operatively connected to a control module 1500, and each one is separately and individually controllable.

[0129] The illustrated focusing system 1100 is configured to adjust the focus of a multi-lens imaging device with two lenses (for a stereoscopic lens system), although alternative focusing systems could be implemented, using the same principles described below, for a single lens imaging device or a greater number of lenses. For ease of reference, only one of the focusing mechanisms 1200 is described in detail herein, although it should be understood that the principle of operation is the same for both (left and right) focusing mechanisms 1200 illustrated in Figure 16 (albeit with the component positions mirrored). Similarly, the bonding agent applicator 1300 described below could be replaced by an applicator having a single vessel and dispenser, when configuring a focusing system for focusing a single lens imaging device.

[0130] As illustrated in Figures 16 and 17, the focusing mechanism 1200 comprises a stepper motor 1202, which comprises a shaft 1204 that is configured to rotate upon activation of the stepper motor 1202. The distal end of the shaft 1204 is connected to a geared rotation member 1206, which rotates in conjunction with the shaft 1204 during operation of the focusing mechanism 1200. The geared rotation member 1206 comprises a geared surface 1206a, which engages with a correspondingly geared drive belt 1208. The outer (flat) surface of the drive belt 1208 can contact a belt tensioner 1209 which is mounted in a corresponding slot 1209a in the adjustable mounting plate 1606. The position of the belt tensioner 1209 along the slot 1209a can be adjusted so that the rotatable head contacts the drive belt 1208 and adjusts its tension to a desired level. Other forms of belt tensioners may be used, including dynamic tensioners. The position of the belt tensioner 1209 is illustrated in Figure 16, whilst the belt tensioner 1209 is removed in Figure 17 to avoid obscuring other features illustrated therein. The drive belt 1208 is also connected to a rotatable lens collet 1210, which is positioned adjacent to the geared rotation member 1206, and which is fixed to the second mounting plate 1606 of the mounting frame 1602. The lens collet 1210 has a geared outer surface 1212, having the same gear pitch as the geared rotation member 1206 and the inner surface of the drive belt 1208. The drive belt 1208 couples the geared rotation member 1206 to the lens collet 1210, as illustrated in Figure 17. Thus, rotation of the drive belt 1208 is effected by the stepper motor 1202, which in turn drives rotation of the lens collet 1210.

[0131] As illustrated in Figure 18, the lens collet 1210 has a generally frustoconical shape, with the widest part comprising the geared outer surface 1212 that engages with the geared inner surface of the drive belt 1208. The lens collet 1210 also comprises an integral sleeve portion 1214 that extends from the narrower part of the frustoconical portion. The sleeve portion 1214 is dimensioned to receive the circumferential lens holder 20a of the lens mount 20. The inner diameter of the sleeve portion 1214 is substantially the same as the outer diameter of the circumferential lens holder 20a such that, when the circumferential lens holder 20a is received within the sleeve portion 1214, the two components enter into frictional engagement. In this manner, the rotation of the lens collet 1210 causes a corresponding rotation of the lens mount 20. With reference to Figure 13, in the illustrated embodiment, the biasing members 1605 include springs that are configured to bias the adjustable mounting plate 1606 away from the fixed mounting plate 1604, although it is alternatively envisaged that other biasing means could beused (e.g., hydraulic or pneumatic pistons, or resiliently deformable biasing members). The adjustable mounting plate 1606 can be moved closer to the fixed mounting plate 1604 by urging the adjustable mounting plate 1606 towards the fixed mounting plate 1604 against the biasing force of the biasing members 1605, which otherwise acts to maintain a selected maximum separation distance. The sleeve portion 1214 of the lens collet 1210 of the adjustable mounting plate 1606 may contact the circumferential lens holder 20a such that the biasing of the adjustable mounting plate 1606 urges the sleeve portion 1214 towards the circumferential lens holder 20a (see Figures 20A and 20B). This can assist in retaining the circumferential lens holder 20a in engagement with the collet 1210 during the focussing operation.

[0132] As described above with reference to Figure 1, the lens mount 20 may also comprise a body portion 20b that is in threaded engagement with the mounting ring 22 of the imaging device. Rotation of the lens mount 20 thus causes the lens 16 to move relatively closer to or further from the image sensor 14, depending on the direction of rotation. Therefore, operation of the stepper motor 1202 indirectly effects the rotation of the lens mount and, as a result, the distance between the lens and the image sensor, due to its interaction with the geared rotation member 1206, the drive belt 1208, and the lens collet 1210.

[0133] The bonding agent applicator 1300 comprises two vessels 1302a, 1302b for storing a bonding agent, and dispensing needles 1304a, 1304b for dispensing the bonding agent, as shown in Figure 14. The vessels 1302a, 1302b are mounted to an applicator bracket 1303, which in turn is movably mounted to the vertically-extending rail 1614, such that the vessels 1302a, 1302b are movable upwards and downwards along the rail 1614 by operation of the linear actuator 1616. Thus, the vessels 1302a, 1302b (and dispensing needles 1304a, 1304b) can be moved downwards and upwards (i.e., relatively closer to, or further from, the imaging device 10 when it is moved into position for application of bonding agent).

[0134] It is alternatively envisaged that the bonding agent applicator 1300 may have a single vessel for storing bonding agent, with two dispensing needles 1304a, 1304b operatively connected thereto to dispense bonding agent onto each lens mount and / or mounting ring of a multi-lens imaging device. In some other embodiments, the dispensing needles 1304a, 1304b may be replaced by spray nozzles, brushes, and / or any other device suitable for dispensing the uncured agent.

[0135] To apply bonding agent to the imaging device 10, the bonding agent applicator 1300 is moved downwards, such that the distal ends of the dispensing needles 1304a, 1304b are proximate the imaging device 10. The bonding agent applicator 1300 is then controlled (via the control module 1500) to release bonding agent onto a surface of the imaging device (e.g., the lens mount 20 and / or the mounting ring 22, see Figure 1). Although not illustrated in Figures 12-20B, it is envisaged that the multi-lens imaging device may be provided with retaining formations (e.g., a plurality of teeth) such that the lens housing has a castellated configuration (as described above, and as shown in Figure 2), and so that the bonding agent applicator 1300 can dispense bonding agent to the spaces between the retaining formations.

[0136] As illustrated in Figure 14, the system 1100 comprises a drip tray 1306, which is movably mounted in relation to the bonding agent applicator 1300. The drip tray 1306 comprises a plate 1308 having two apertures 1310 and two drip cups 1312. The illustrated embodiment uses drip cups 1312, although these may be replaced by any suitable collecting vessel that prevents any leaking bonding agent from falling onto the imaging device 10 or other components of the focusing system 1100 unintentionally.

[0137] The drip tray 1306 is arranged such that a first drip cup is positioned adjacent to a first aperture, which is in turn adjacent to a second drip cup, and a second aperture (as shown in Figure 14). The drip tray 1306 is mounted on the horizontally-extending rail 1618 and is movable along the rail 1618 by operation of the linear actuator 1620. The drip tray 1306 is movable between a first position in which the centres of the drip cups 1312 are aligned with the dispensing needles 1304a, 1304b, and a second position in which the centres of the apertures 1310 are aligned with the dispensing needles 1304a, 1304b.

[0138] In the first position, the dispensing needles are positioned vertically above the drip cups 1312 such that the drip cups collect residual bonding agent that leaks from the dispensing needles 1304a, 1304b after the application of bonding agent. In the second position (as shown in Figure 14), the dispensing needles 1304a, 1304b are positioned vertically above the apertures 1310.

[0139] The focusing system 1100 also comprises a curing device 1400 configured to cure bonding agent applied to the imaging device 10. As illustrated in Figure 19, the curing device 1400 is fixedly mounted to the adjustable mounting plate 1606 of the mounting frame 1602. The curing device 1400 comprises a plurality of ultraviolet (UV) radiation sources 1402 mounted ona disc 1404 having a central aperture 1406. The UV radiation sources 1402 are mounted equidistantly around the circumference of the central aperture 1406 such that they face inwardly towards the central aperture 1406. In use, the lens mount of the imaging device pass through the central aperture 1406 before engaging the lens collet 1210 (see Figures 20A and 20B), such that the UV radiation sources 1402 are directed towards the lens mount and mounting ring to facilitate curing of the bonding agent that is dispensed onto the lens mount and / or the mounting ring. The curing device 1400 also comprises a cover (which is removed in Figure 19 for visibility) which encloses the UV radiation sources 1402.

[0140] Figures 20A and 20B further illustrate the curing device 1400 and lens collet 1210. In Figures 20A and 20B, the curing device 1400 and lens collet 1210 are shown in cross-section. Figure 20B shows the same cross-section as Figure 20A but includes a schematic outline of the lens mount 2000. This schematic of the lens mount 2000 illustrates the profile of the circumferential lens holder 20a and body 20b of the lens mount to illustrate how the lens mount is received within curing device 1400 and lens collet 1210. It can be seen that the cover 1405 of the curing device 1400 includes a first aperture 1401 and the central aperture 1406, through which the lens holder 20a of the lens passes to engage with the lens collet 1210.

[0141] The lens collet 1210 is mounted to the adjustable mounting frame 1606 with a bearing 1622 (in this illustrated embodiment, a ball bearing) so that the lens collet 1210 can be rotated by the geared rotation member 1206 and the drive belt 1208 (see Figures 16 and 17). The lens holder 20a is force- fit into the sleeve 1214 with sufficient gripping force that, as the collet 1210 is rotated, the lens mount 2000 will also rotate. The sleeve 1214 includes a lip 1216 the projects radially inwardly from the inner wall of the sleeve 1214. The lip 1216 is dimensioned so that the lens holder 20a is force-fit into the collet 1210. As illustrated in Figures 20A and 20B, the lens collet 1210 is provided with a first O-ring 1218, positioned immediately adjacent to the lip 1216, wherein the inner diameter of the first O-ring 1218 is substantially the same as the inner diameter of the lip 1216 (and the outer diameter of the lens holder 20a). The inner portion of the first O- ring provides a contact surface for engaging the side of the lens holder 20a. As the lens holder 20a passes the lip 1216 and the first O-ring 1218 to an engaged position, the first O-ring 1218 can provide a gripping force on the lens holder 20a. The first O-ring 1218 may create a higher coefficient of friction to resist circumferential movement of the lens holder 20a relative to the collet 1210. That is, it can provide a circumferential gripping force. The first O-ring 1218 mayprovide an axial gripping force to facilitate retaining the lens holder 20a within the lens collet 1210.

[0142] The lens collet 1210 is also provided with a second O-ring 1220, positioned relatively further from the lip 1216, and having an inner diameter smaller than that of the first O-ring 1218. The lens holder 20a does not pass through the second O-ring 1220, which instead limits the extent to which the lens holder 20a can enter the sleeve 1214. The upper portion of the second O-ring 1220 contacts the inner surface of the sleeve 1214 in use. As the lens holder 20a reaches its fully inserted position (as shown in Figure 20B), the distal end of the lens holder 20a contacts the second O-ring 1220. As such, the lower portion of the second O-ring 1220 provides a second contact surface. The second O-ring 1220 may be dimensioned to contact part of the lens holder 20a extending around the perimeter of the lens, without contacting the lens itself. The gripping force provided by the second O-ring 1220 contacting the inner surface of the sleeve 1214 and the distal end of the lens holder 20a can resist circumferential movement of the lens holder 20a relative to the collet 1210. This second contact surface may increase the gripping force on the lens holder 20a to provide an axial gripping force. This may facilitate retaining the lens mount 2000 in the desired position within the collet 1212 during focussing. The first and second O- rings 1218, 1220 are formed from an elastomeric material to provide an effective gripping force on the lens holder 20a when it is received in the sleeve 1214, although it is envisaged that other materials may be used as long as they provide a sufficient gripping force to the lens holder 20a to facilitate synchronous rotation of the lens mount 2000 and the lens collet 1210.

[0143] Although the illustrated embodiment includes a pair of O-rings 1218, 1220, it is envisaged that other embodiments may include only one of the first and second O-rings 1218, 1220. Alternatively, in some embodiments, one or both of the O-rings may be replaced by another slip-resistant member (e.g., a gasket, or flat membrane) positioned in the sleeve 1214 or on another component of the lens collet 1210, where the slip-resistant member is configured to contact the lens holder 20a and provide a gripping force to the lens holder 20a.

[0144] The plurality of ultraviolet (UV) radiation sources 1402 of the curing device 1400 are arranged around the central aperture 1406 so that the beam angles 1403 will overlap to provide the desired level of radiation to the body 20b (as well as the associated structure to fix the body 20b into position when body agent is cured).T1

[0145] In alternative embodiments, the curing device 1400 may alternatively, or additionally, be provided with a heating device, such as an infrared heater or resistance heater, which is capable of curing a bonding agent. In another alternative, the circumferentially spaced radiation sources may be replaced by a ringed source such as a ring light, or other light source, provided that the source is configured to direct light / radiation around substantially the entire circumference of the lens mounts and / or mounting rings to provide even curing. Methods of operation

[0146] Disclosed herein is method for focusing an imaging device, the method comprising: adjusting the distance between the image sensor and the lens to adjust the focus of the imaging device; determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens; and preventing movement of the lens relative to the image sensor by fixing the position of the lens using a bonding agent. In some embodiments, various sub-systems of the focusing system are controllable by a control module. For example, as shown in Figure 9, the control module 500 may be operatively connected to the focusing mechanism 200, the applicator 300 and the curing device 400. The control module 500 may also be operatively in communication with the imaging device 10.

[0147] The control module 500 may comprise a plurality of controllers. In the illustrated embodiment, a primary controller 502 is configured to control operation of the focusing mechanism 200. The primary controller is in a two-way data communication with the stepper motor 202 and is configured to control operation of the stepper motor 202 (i.e., switching on or off) and the direction of rotation of the shaft 204. Rotation of the shaft in a first direction causes the threaded sleeve 206 to move in a forward direction through the threaded opening 208, to effect corresponding rotation of the drive gear 210 and the lens gear 216, and forward motion of the drive gear 210 and lens gear 216. In turn, this causes forward movement of the lens mount 20, increasing the distance between the lens 16 and the image sensor 14. Conversely, rotating the shaft 204 in a second direction, opposite to the first direction, causes the threaded sleeve 206 to move in a rearward direction through the threaded opening 208, to effect corresponding rotation and rearward movement of the drive gear 210 and the lens gear 216. This causes rearward movement of the lens mount 20, decreasing the distance between the lens 16 and the image sensor 14.

[0148] The primary controller 502 is also in a two-way data communication with the bonding agent applicator 300 and is configured to control the release of bonding agent.

[0149] The primary controller 502 is also in a two-way data communication with the stepper motor 412 that effects rotation of the UV probes 402a-402d (via rotation of drive gear 408, intermediate gear 410 and the probe gear 404). The primary controller 502 is thereby capable of controlling operation of the stepper motor 412 to rotate the UV probes 402a-402d relative to the imaging device 10.

[0150] The control module 500 also comprises a secondary controller 504. The secondary controller 504 is in a two-way data communication with the UV probes 402a-402d of the curing device 400. The secondary controller 504 is configured to activate and deactivate the UV probes 402a-402d when the curing device 400 is in the operating position. The UV curing device is an illustrative embodiment only and it will be appreciated that a control module can be suitably configured to control devices for other curing processes.

[0151] For embodiments in which the plate 406 is pivotably mounted to the frame 102 via a mechanism the primary controller 502 may also be configured to control operation of the mechanism and thereby control the movement of the plate 406 to move the UV probes 402a- 402d between operating and non-operating positions. For example, the plate 406 may be pivotably mounted to the frame 102 via a stepper motor (not shown) and the primary controller 502 may also be configured to control operation of the stepper motor and thereby control the movement of the plate 406 to move the UV probes 402a-402d between operating and nonoperating positions.

[0152] In some embodiments of the present invention, determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens comprises: capturing a plurality of images of a target object via the imaging device during adjustment of the distance between the image sensor and the lens; analysing the plurality of images; determining an optimal image of the plurality of images of the target object; and controlling the adjustment of the distance between the image sensor and the lens to position the image sensor and the lens at the distance associated with the optimal image.

[0153] The control module 500 of Figure 9 further comprises an image analysis module 506. The image analysis module 506 is configured to control operation of the imaging device 10, including controlling the capturing and recording of images from the imaging device, andanalysing the captured images. In alternative embodiments, the imaging device 10 may itself comprise an image analysis module, in conjunction with, or in place of, the image analysis module 506 of the control module 500. In those embodiments in which the imaging device 10 comprises an image analysis module, said image analysis module is operatively in communication with the remotely located control module 500.

[0154] The control module 500 allows various steps of the focusing procedure to be automated, via the interaction between the primary and secondary controllers 502, 504 and the image analysis module 506. However, it is not necessary for all steps to be automated. Instead, it may be desirable, in some circumstances, to allow manual operation of particular components of the focusing system 100 in combination with automatic operation of other components. Manual control can be achieved by user interaction with a user interface 508. The user interface 508 may be a central computer terminal, which is operatively connected to the control module to allow the user to operate each individual sub-system (i.e., the focusing mechanism 200, bonding agent applicator 300, curing device 400, imaging device 10). Alternatively, the separate sub-systems may each comprise a user interface, to allow control of each sub-system individually, or by different users.

[0155] One method for focusing an imaging device 10 involves mounting the imaging device 10 on the autofocusing system 100, before manually operating the focusing mechanism 200 to adjust the distance between the lens 16 and the image sensor 14 and, therefore, to adjust the focus of the imaging device 10. In this method, the user operates the imaging device 10 to capture an image, which is displayed to the user and which may be stored in a memory device 28 associated with the imaging device 10. The memory device 28 may be included in the imaging device 10, as illustrated in Figure 9, or, alternatively, may be remotely located and associated with the control module 500.

[0156] In a manual mode of operation, the user adjusts the distance between the lens 16 and the image sensor 14 and observes captured images (either individual images, or a video feed) to determine when the image sensor 14 is substantially aligned with the focal point of the lens. After the alignment step is completed, the user then fixes the position of the lens using the bonding agent.

[0157] In another manual mode of operation, the user adjusts the distance between the lens 16 and the image sensor 14 and captures an image associated with said distance. This step isrepeated until a selection of images is captured and stored. The user manually observes the captured images to determine the highest quality (for example, optimally focused) image and, in turn, to determine the correct distance between the image sensor and the lens 16 such that the image sensor 14 is substantially aligned with the focal point of the lens 16. After the lens is in position (and a desired amount of bonding agent has been applied to the imaging device 10), the user then operates the curing device 400, to move the curing device 400 from a non-operating position to an operating position, and to activate the UV probes 402a-402d. The UV probes 402a-402d may be configured to operate for a pre-determined period of time sufficient to cure a particular bonding agent, or the probes 402a-402d may be manually deactivated by the user after a selected period of time.

[0158] The bonding agent may be applied before, during and / or after adjusting the position of the lens. Thus, in some manual modes of operation, the bonding agent applicator 300 is operated concurrently with the movement mechanism. This allows the bonding agent to be applied continuously, or at selected intervals, during the adjustment of the distance between the lens 16 and the image sensor 14 and the determination of the optimal focus for the imaging device 10.

[0159] In automated modes of operation, the user mounts the imaging device 10 on the autofocusing system 100 and, via the control module 500, commences the autofocusing operation. The primary controller 502 sends a control signal to the stepper motor 202 of the focusing mechanism 200 to adjust the distance between the lens 16 and the image sensor 14.The primary controller also sends one or more control signals to the imaging device 10 to capture and store images during the adjustment of the lens-sensor distance. The image analysis module 506 initiates a comparison between the captured images and determines the highest quality and / or optimally focused image and, upon determining said image, sends a signal to the primary controller 502 to direct the primary controller 502 to activate the focusing mechanism 200 to position the lens 16 as the distance from the image sensor 14 associated with said image, thus substantially aligning the image sensor 14 with the focal point of the lens 16. Once the desired lens-sensor distance has been achieved, a user may take control of the system and perform the steps of applying bonding agent by operating the bonding agent applicator 300 and, subsequently, operating the curing device as described above.

[0160] In some other embodiments, upon initiating movement of the lens, the primary controller 502 sends a control signal to the bonding agent applicator 300 to effect the dispensing of bondingagent onto the lens mount 20 of the imaging device 10. Alternatively or additionally, when the user commences the autofocusing operation, but before movement of the lens, the primary controller 502 sends a control signal to the bonding agent applicator 300 to effect the dispensing of bonding agent onto the lens mount 20 of the imaging device 10. For automated modes of operation, the primary controller 502 may send control signals to the stepper motor 202 of the focusing mechanism 200 to adjust the lens-sensor distance whilst concurrently sending one or more control signals to the bonding agent applicator 300, to effect dispensing of bonding agent to the lens mount 20 in a continuous manner during the adjustment of the lens-sensor distance, or at regular intervals during said adjustment. After the bonding agent has been applied, the user may take control of the system and effect the operation of the curing device as described above.

[0161] Alternatively, in further automated modes of operation, upon setting the desired lenssensor distance, the primary controller 502 sends a control signal to the bonding agent applicator 300 to effect the dispensing of bonding agent onto the lens mount 20 of the imaging device 10. After the bonding agent has been applied, the user may take control of the system and effect the operation of the curing device as described above.

[0162] In a fully automated mode of operation, after the automated setting of the lens-sensor distance and the application of bonding agent, the first controller 502 sends a control signal to the second controller 504. The second controller 504 processes this signal and, in turn, sends a control signal to the curing device 400 to the activate the UV curing probes 402a-402d for a predetermined period of time to cure the bonding agent and to prevent movement of the lens 16 relative to the image sensor 14. The first controller 502 also sends a control signal to the stepper motor 412, to activate the stepper motor 412 to effect rotation of the UV curing probes 402a- 402d relative to the imaging device. The system may be configured to activate the UV curing probes 402a-402d (via the secondary controller 504) concurrently with the rotation of the UV curing probes 402a-402d (controlled via the primary controller 502).

[0163] In addition to being applicable to single-lens focussing systems, as discussed above, it should be understood that the manual and automated modes of operation described above are also applicable to multi-lens focussing systems, to facilitate the adjustment of two or more lenssensor distances and focusing the lens-sensor pairs, the application of bonding agent to the lens mounts 20, 20’ by the bonding agent applicator 300, and the curing of the bonding agent by the curing device 400.

[0164] The method of operation of the focusing system 1100 is also described below. The overall method is similar to that of focusing system 100, although the movement of components differs due to the alternative arrangement of the frame system 1602, and the modified focusing mechanism 1200. As shown in Figure 21, the control module 1500 may be operatively connected to stepper motor 1202 of the focusing mechanism 1200, bonding agent applicator 1300, the UV radiation sources 1402 of the curing device 1400, and the linear actuators 1612, 1616 and 1620. The control module 1500 may also be in two-way communication with an image analysis module 1506 which is configured to capture and record images from the multi-lens imaging device 10.

[0165] The focusing operation begins by placing the imaging device 10 in position on the alignment frame 1608 (i.e. by securely clamping the housing 12 of the imaging device 10 to the alignment frame 1608). The control module 1500 then commences operation of the linear actuator 1612 to move the alignment frame 1608, such that the lens mounts 20 and the mounting rings 22 of the multi-lens imaging device are aligned with, and positioned vertically below, the dispensing needles 1304a, 1304b of the bonding agent applicator 1300. Once the alignment frame 1608 is in the correct position, the control module 1500 commences operation of the linear actuator 1620, to move the drip tray 1306 to the second position, in which the dispensing needles 1304a, 1304b are aligned with the drip tray apertures 1310. Subsequently, the control module 1500 commences operation of the linear actuator 1616 to move the bonding agent applicator 1300 downwards, such that the dispensing needles 1304a, 1304b pass through the drip tray apertures 1310 (as shown in Figure 14B) and move to a position in which the distal ends of the dispensing needles 1304a, 1304b are positioned proximate (above) the lens mounts 20 and mounting rings 22 of the multi-lens imaging device.

[0166] Once the dispensing needles 1304a, 1304b are correctly positioned, the control module 1500 controls the release of bonding agent from the bonding agent applicator 1300, so that the bonding agent is dispensed onto the lens mounts 20 and / or mounting rings 22 of the multi-lens imaging device. After a desired amount of bonding agent has been dispensed, the control module 1500 ceases the release of bonding agent and operates the linear actuator 1616 to move the bonding agent applicator 1300 upwards, such that the dispensing needles 1304a, 1304b are removed from the apertures 1310. Subsequently, the control module 1500 operates the linear actuator 1620 to return the drip tray 1306 to the first position, so that the drip cups 1312 sitbelow the distal ends of the dispensing needles 1304a, 1304b. The drip cups 1312 are then correctly positioned to collect any bonding agent that leaks from the dispensing needles 1304a, 1304b and prevent excess bonding agent dripping onto the imaging device or components of the focusing system 1100.

[0167] After the bonding agent has been applied, the control module 1500 operates the linear actuator 1612 to move the alignment frame 1608 towards the adjustable mounting plate 1606 of the mounting frame 1602. Applying the bonding agent before and / or during movement of the alignment frame 1608 may facilitate distribution of bonding agent around the lens. Initial dispensing of the bonding agent by the dispensing needle 1304a, 1304b may, in some cases, be relatively localised. However, the rotation of the lens mount during focussing (described below) may cause the uncured boding agent to be better distributed around the lens.

[0168] Before operation of the focusing mechanism 1200 commences, the alignment frame 1608 is moved forwards until each lens mount 20, 20’ of the multi-lens imaging device passes through the corresponding aperture 1406 of the curing device 1400 and engages with the corresponding sleeve 1214 of each lens collet 1210 and is received therein. When the alignment frame 1608 is correctly positioned such that the lens mounts 20 and the lens collets 1210 are securely engaged, this causes the adjustable mounting plate 1606 to move against the spring biasing force towards the fixed mounting plate 1604. The second mounting plate 1606 therefore experiences a force in one direction due to the biasing members 1605, and a force in the opposite direction due to engagement with the alignment frame 1608, which maintains the correct relative positioning of the plates and the alignment frame 1608 during the focusing operation.

[0169] The control module 1500 then commences operation of the focusing mechanism 1200, to rotate the lens collets 1210 in a selected direction to cause movement of the lenses closer towards, or further away from, the respective image sensors. During the adjustment of the multilens imaging device, the control module 1500 is in two-way communication with an image analysis module 1506 which is configured to capture and record images from the multi-lens imaging device 10 and analyse the images to determine whether the images are correctly focused. The image analysis module 1506 operates in effectively the same manner as the analysis module 506 described above.

[0170] Once the optimally focused positions of each lens and image sensor pair has been determined, the operation of the focusing mechanisms 1200 is ceased. The control module 1500then activates the UV radiation sources 1402 for a period of time sufficient to cure the bonding agent that has been previously applied to the lens mounts and mounting rings, before deactivating the UV radiation sources 1402 when curing is complete. In some embodiments, the curing device 1400 may alternatively, or additionally, be provided with a heating device, such as an infrared heater or resistance heater, which is capable of curing a bonding agent or an alternative light source. It will be appreciated that, in these embodiments, the control module 1500 may analogously activate the curing device in order to initiate curing conditions and then, at a suitable time, deactivate curing conditions.

[0171] After the curing operation is completed, the control module 1500 operates the linear actuator 1612 to move the alignment frame 1608 away from the adjustable mounting plate 1606. The adjustable mounting plate 1606 is then returned to its initial position by the biasing members 1605. As the alignment frame 1608 moves away from the adjustable mounting plate 1606, the lens mounts 20 are removed from the sleeves 1214 of the respective lens collets 1210. When the alignment frame 1608 is positioned away from the mounting frame 1602, the clamps 1609 may be released to allow the focused multi-lens imaging device to be removed.

[0172] Thus, once the multi-lens imaging device is clamped to the alignment frame 1608 by a user, the focusing system 1100 is capable of applying bonding agent to the lens mounts and / or mounting rings, adjusting the distances between lenses and image sensors of the multi-lens imaging device, and fixing the multi-lens imaging device in focus by curing the bonding agent, in a fully automated manner.

[0173] All references cited herein are incorporated herein in their entireties. If there is a conflict between definitions herein and in an incorporated reference, the definition herein shall control.

[0174] The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.

[0175] As used herein, the singular forms "a," "an," and "the" designate both the singular and the plural, unless expressly stated to designate the singular only.

[0176] The term "about" and the use of ranges in general, whether or not qualified by the term about, means that the number comprehended is not limited to the exact number set forth herein,and is intended to refer to ranges substantially within the quoted range while not departing from the scope of the invention. As used herein, "about" will be understood by persons of ordinary skill in the art and will vary to some extent on the context in which it is used. If there are uses of the term which are not clear to persons of ordinary skill in the art given the context in which it is used, "about" will mean up to plus or minus 10% of the particular term.

[0177] In addition, where dimensions are described herein, it will be appreciated that plus or minus (±) typical manufacturing tolerances are applicable to those values. As appreciated by those in the art, manufacturing tolerances may be determined to achieve a desired mean and standard deviation of manufactured components in relation to the ideal component profile.

[0178] Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.EXAMPLES

[0179] The following are nonlimiting examples.

[0180] Example 1 - a system for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the system comprises: a focusing mechanism configured to selectively adjust the distance between the image sensor and the lens of the imaging device to relatively position the image sensor and the lens at a distance selected from a first distance at which the lens is proximal to the image sensor, a second distance at which the lens is remote from the image sensor, and intermediate distances therebetween, to focus the imaging device; an applicator configured to apply a bonding agent to the imaging device, said bonding agent for preventing movement of the lens relative to the image sensor, to fix the imaging device in focus at the selected distance.

[0181] Example 2 - the system according to Example 1, wherein the applicator is configured to apply bonding agent to a mounting ring of a lens housing that receives a lens mount comprising the lens of the imaging device.

[0182] Example 3 - the system according to Example 2, wherein the mounting ring comprises a plurality of teeth in a castellated configuration, and wherein the applicator is configured to apply bonding agent between adjacent teeth of the plurality of teeth.

[0183] Example 4 - the system according to any one of the preceding Examples, wherein the bonding agent is an ultraviolet-curable adhesive, and the system comprises an ultraviolet curing device.

[0184] Example 5 - the system according to Example 4, wherein the ultraviolet curing device comprises a plurality of probes, said probes arranged to expose bonding agent to ultraviolet radiation at equidistant intervals around the lens.

[0185] Example 6 - the system according to Example 5, wherein the probes are rotatable relative to the lens.

[0186] Example 7 - the system according to any one of Examples 4 to 6, wherein the ultraviolet curing device is movable between: an operating position, in which the ultraviolet curing device is positioned adjacent to the imaging device; and a non-operating position, in which the ultraviolet curing device is positioned away from the imaging device.

[0187] Example 8 - the system according to any one of the preceding Examples, comprising a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; a lens gear configured to releasably connect to a lens mount of the imaging device; and a drive belt operatively connected to the drive gear and the lens gear so that rotation of the drive gear effects corresponding rotation of the drive belt and the lens gear.

[0188] Example 9 - the system according to any one of Examples 1 to 7, comprising a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; and a lens gear in a meshed connection with the drive gear and configured to rotate in conjunction with the drive gear, wherein the lens gear is configured to releasably connect to a lens mount of the imaging device.

[0189] Example 10 - the system according to Example 8 or Example 9, wherein: the shaft of the stepper motor comprises a threaded portion; the frame comprises a threaded opening; and wherein the threaded portion and the threaded opening have the same thread pitch.

[0190] Example 11 - the system according to any one of the preceding Examples, wherein: the focusing mechanism is configured to adjust the distances between two or more lenses and two or 1more respective image sensors in a multi-lens imaging device; and the applicator is configured to apply the bonding agent at a plurality of locations on the multi-lens imaging device, to prevent movement of each lens relative to its respective image sensor.

[0191] Example 12 - the system according to Example 11, wherein the focusing mechanism is configured to adjust the distance between each lens and its respective image sensor independently.

[0192] Example 13 - the system according to any one of the preceding Examples, further comprising a primary controller operatively in communication with the focusing mechanism and the applicator, the primary controller configured to: operate the focusing mechanism to control adjustment of the distance between the lens and the image sensor; and operate the applicator to control application of the bonding agent to the imaging device.

[0193] Example 14 - the system according to Example 13, when dependent on Example 5, wherein the primary controller is further configured to: operate a second stepper motor to control rotation of the UV probes.

[0194] Example 15 - the system according to Example 13, further comprising an image processing module operatively in communication with the primary controller, wherein the image processing module is configured to analyse images captured using the imaging device and to transfer data to the primary controller.

[0195] Example 16 - the system according to Examples 4 or any one of Examples 5 to 15, when dependent from Example 4, further comprising a secondary controller operatively in communication with the ultraviolet curing device, the secondary controller configured to operate the ultraviolet curing device to effect curing of the ultraviolet-curable adhesive.

[0196] Example 17 - the system according to any one of Examples 1 to 5, wherein the imaging device, the focusing mechanism and the applicator are movable relative to a fixed mounting plate.

[0197] Example 18 - the system according to Example 17, comprising: a mounting frame, comprising the fixed mounting plate and an adjustable mounting plate connected thereto, wherein the adjustable mounting plate is positioned parallel to the fixed mounting plate and is configured to move towards and away from the fixed mounting plate; and an alignment frame configured to releasably receive the imaging device.

[0198] Example 19 - the system according to Example 18, wherein the adjustable mounting plate is connected to the fixed mounting plate by at least one biasing member, such that the adjustable mounting plate is biased away from the fixed mounting plate and is movable towards the fixed mounting plate against a biasing force exerted by the at least one biasing member.

[0199] Example 20 - the system according to Example 18 or Example 19, wherein the applicator is configured to be movable along a first direction, and the alignment frame is configured to be movable along a second direction perpendicular to the first direction.

[0200] Example 21 - the system according to Example 20, wherein comprising: a first actuator configured to move the applicator along the first direction; and a second actuator configured to move the alignment frame along the second direction.

[0201] Example 22 - the system according to Example 20 or Example 21, comprising: a drip tray, comprising at least one collecting vessel and at least one aperture, wherein: the drip tray is configured to be movable between an operative position and a non-operative position along a third direction, said third direction being perpendicular to each of the first and second directions; and at least one collecting vessel is aligned with the applicator when the drip tray is in the operative position, and at least one aperture is aligned with the applicator when the drip tray is in the non-operative position.

[0202] Example 23 - the system according to any one of Examples 18 to 22, wherein the focusing mechanism comprises: a stepper motor; a rotation member operatively connected to a shaft of the stepper motor; a lens collet; and a drive belt operatively connected to the rotation member and the lens collet, so that rotation of the rotation member effects corresponding rotation of the drive belt and the lens collet.

[0203] Example 24 - the system according to Example 23, wherein the lens collet and the stepper motor are mounted to the adjustable mounting plate.

[0204] Example 25 - the system according to Example 23 or Example 24, wherein the lens collet comprises a sleeve configured to receive a lens mount comprising the lens of the imaging device, so that rotation of the lens collet effects corresponding rotation of the lens mount to adjust the distance between the image sensor and the lens of the imaging device.

[0205] Example 26 - the system according to any one of Examples 18 to 25 when dependent from Example 4 or Example 5, wherein the ultraviolet curing device is mounted to the adjustable mounting plate.

[0206] Example 27 - the system according to any one of Examples 17 to 26, comprising a control module operatively in communication with the imaging device, the focusing mechanism, and the applicator.

[0207] Example 28 - the system according to Example 27, when dependent on Example 21, wherein the control module is operatively in communication with the first actuator and the second actuator.

[0208] Example 29 - the system according to Example 27, when dependent on Example 22, wherein the control module is operatively in communication with the third actuator.

[0209] Example 30 - the system according to Example 27, when dependent on Example 26, wherein the control module is operatively in communication with the ultraviolet curing device.

[0210] Example 31 - a method for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the method comprises: adjusting the distance between the image sensor and the lens to adjust the focus of the imaging device; determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens; and preventing movement of the lens relative to the image sensor by fixing the position of the lens using a bonding agent.

[0211] Example 32 - the method according to Example 31, wherein determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens comprises: capturing a plurality of images of a target object via the imaging device during adjustment of the distance between the image sensor and the lens; analysing the plurality of images; determining an optimal image of the plurality of images of the target object; and controlling the adjustment of the distance between the image sensor and the lens to position the image sensor and the lens at the distance associated with the optimal image.

[0212] Example 33 - the method according to Example 31 or Example 32, comprising applying the bonding agent to the imaging device before adjustment of the distance between the image sensor and the lens.

[0213] Example 34 - the method according to Example 31 or Example 32, comprising applying the bonding agent to the imaging device during adjustment of the distance between the image sensor and the lens.

[0214] Example 35 - the method according to Example 31 or Example 32, comprising applying the bonding agent to the imaging device after adjustment of the distance between the image sensor and the lens.

[0215] Example 36 - the method according to any one of Examples 31 to 35, wherein: the bonding agent is an ultraviolet-curable adhesive; and fixing the position of the lens using the bonding agent comprises curing the ultraviolet-curable adhesive.

[0216] Example 37 - the method according to Example 36, further comprising, selectively: moving the ultraviolet curing device to an operating position adjacent to the imaging device for curing of the ultraviolet-curable adhesive; and moving the ultraviolet curing device to a nonoperating position away from the imaging device.

[0217] Example 38 - the method according to any one of Examples 31 to 37, wherein the imaging device comprises two or more lenses and two or more respective image sensors and, for each lens of the device, the method comprises: adjusting the distance between said lens and said lens’s respective image sensor to adjust the focus of the imaging device; determining that the distance between said lens and said lens’s respective image sensor is such that the image sensor is substantially aligned with the focal point of said lens; and preventing movement of said lens relative to said lens’s respective image sensor by fixing the position of the lens using a bonding agent.

[0218] Example 39 - the method according to Example 38, wherein adjusting the distance between one of said two or more lenses and said lens’s respective image sensor is performed independently of adjusting the distance between another of said two or more lenses and said other lens’s respective image sensor.

[0219] Example 40 - an imaging device, comprising: an image sensor; and a lens positioned at a fixed distance from the image sensor; wherein the position of the lens relative to the image sensor is fixed using a bonding agent.

[0220] Example 41 - an imaging device, comprising an image sensor, a lens, a lens mount in which the lens in mounted and a lens housing configured to receive the lens mount; wherein either or each of the lens mount and lens housing have a plurality of retaining formations, said formations defining interstices configured to receive a bonding agent.

[0221] Example 42 - the imaging device of Example 41, wherein the lens housing comprises a mounting ring configured to receive the lens mount and the mounting ring comprises retaining formations.

[0222] Example 43 - the imaging device of Example 41 or Example 42, wherein the retaining formations are a plurality of teeth in a castellated configuration.

[0223] Example 44 - the imaging device of any one of Examples 41 to 43, wherein the position of the lens relative to the image sensor is fixed using a bonding agent and the imaging device comprises bonding agent within the interstices.

[0224] Example 45 - the imaging device according to any one of Examples 41 to 44, wherein the imaging device is formed by the method of any one of Examples 27 to 39.

[0225] Embodiments have been described herein with reference to the accompanying drawings. However, some modifications to the described embodiments may be made without departing from the spirit and scope of the described embodiments, as described in the appended claims.

Claims

CLAIMSWhat is claimed is:

1. A system for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the system comprises: a focusing mechanism configured to selectively adjust the distance between the image sensor and the lens of the imaging device to relatively position the image sensor and the lens at a distance selected from a first distance at which the lens is proximal to the image sensor, a second distance at which the lens is remote from the image sensor, and intermediate distances therebetween, to focus the imaging device; an applicator configured to apply a bonding agent to the imaging device, said bonding agent for preventing movement of the lens relative to the image sensor, to fix the imaging device in focus at the selected distance.

2. The system according to claim 1, wherein the applicator is configured to apply bonding agent to a mounting ring of a lens housing that receives a lens mount comprising the lens of the imaging device.

3. The system according to claim 2, wherein the mounting ring comprises a plurality of teeth in a castellated configuration, and wherein the applicator is configured to apply bonding agent between adjacent teeth of the plurality of teeth.

4. The system according to any one of the preceding claims, wherein the bonding agent is an ultraviolet-curable adhesive, and the system comprises an ultraviolet curing device.

5. The system according to claim 4, wherein the ultraviolet curing device comprises a plurality of probes, said probes arranged to expose bonding agent to ultraviolet radiation at equidistant intervals around the lens.

6. The system according to claim 5, wherein the probes are rotatable relative to the lens.

7. The system according to any one of claims 4 to 6, wherein the ultraviolet curing device is movable between: an operating position, in which the ultraviolet curing device is positioned adjacent to the imaging device; and a non-operating position, in which the ultraviolet curing device is positioned away from the imaging device.

8. The system according to any one of the preceding claims, comprising a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; a lens gear configured to releasably connect to a lens mount of the imaging device; and a drive belt operatively connected to the drive gear and the lens gear so that rotation of the drive gear effects corresponding rotation of the drive belt and the lens gear.

9. The system according to any one of claims 1 to 7, comprising a frame configured to releasably retain the image sensor in a static position, wherein the focusing mechanism comprises: a stepper motor mounted to the frame; a drive gear mounted to a shaft of the stepper motor, the drive gear configured to rotate upon activation of the stepper motor; and a lens gear in a meshed connection with the drive gear and configured to rotate in conjunction with the drive gear, wherein the lens gear is configured to releasably connect to a lens mount of the imaging device.

10. The system according to claim 8 or claim 9, wherein: the shaft of the stepper motor comprises a threaded portion; the frame comprises a threaded opening; and wherein the threaded portion and the threaded opening have the same thread pitch.

11. The system according to any one of the preceding claims, wherein: the focusing mechanism is configured to adjust the distances between two or more lenses and two or more respective image sensors in a multi-lens imaging device; and the applicator is configured to apply the bonding agent at a plurality of locations on the multi-lens imaging device, to prevent movement of each lens relative to its respective image sensor.

12. The system according to claim 11, wherein the focusing mechanism is configured to adjust the distance between each lens and its respective image sensor independently.

13. The system according to any one of the preceding claims, further comprising a primary controller operatively in communication with the focusing mechanism and the applicator, the primary controller configured to: operate the focusing mechanism to control adjustment of the distance between the lens and the image sensor; and operate the applicator to control application of the bonding agent to the imaging device.

14. The system according to claim 13, when dependent on claim 5, wherein the primary controller is further configured to: operate a second stepper motor to control rotation of the UV probes.

15. The system according to claim 13, further comprising an image processing module operatively in communication with the primary controller, wherein the image processing module is configured to analyse images captured using the imaging device and to transfer data to the primary controller.

16. The system according to claims 4 or any one of claims 5 to 15, when dependent from claim 4, further comprising a secondary controller operatively in communication with the ultraviolet curing device, the secondary controller configured to operate the ultraviolet curing device to effect curing of the ultraviolet-curable adhesive.

17. The system according to any one of claims 1 to 5, wherein the imaging device, the focusing mechanism and the applicator are movable relative to a fixed mounting plate.

18. The system according to claim 17, comprising: a mounting frame, comprising the fixed mounting plate and an adjustable mounting plate connected thereto, wherein the adjustable mounting plate is positioned parallel to the fixed mounting plate and is configured to move towards and away from the fixed mounting plate; and an alignment frame configured to releasably receive the imaging device.

19. The system according to claim 18, wherein the adjustable mounting plate is connected to the fixed mounting plate by at least one biasing member, such that the adjustable mounting plate is biased away from the fixed mounting plate and is movable towards the fixed mounting plate against a biasing force exerted by the at least one biasing member.

20. The system according to claim 18 or claim 19, wherein the applicator is configured to be movable along a first direction, and the alignment frame is configured to be movable along a second direction perpendicular to the first direction.

21. The system according to claim 20, wherein comprising: a first actuator configured to move the applicator along the first direction; and a second actuator configured to move the alignment frame along the second direction.

22. The system according to claim 20 or claim 21, comprising: a drip tray, comprising at least one collecting vessel and at least one aperture, wherein: the drip tray is configured to be movable between an operative position and a nonoperative position along a third direction, said third direction being perpendicular to each of the first and second directions; and at least one collecting vessel is aligned with the applicator when the drip tray is in the operative position, and at least one aperture is aligned with the applicator when the drip tray is in the non-operative position.

23. The system according to any one of claims 18 to 22, wherein the focusing mechanism comprises: a stepper motor; a rotation member operatively connected to a shaft of the stepper motor; a lens collet; and a drive belt operatively connected to the rotation member and the lens collet, so that rotation of the rotation member effects corresponding rotation of the drive belt and the lens collet.

24. The system according to claim 23, wherein the lens collet and the stepper motor are mounted to the adjustable mounting plate.

25. The system according to claim 23 or claim 24, wherein the lens collet comprises a sleeve configured to receive a lens mount comprising the lens of the imaging device, so that rotation of the lens collet effects corresponding rotation of the lens mount to adjust the distance between the image sensor and the lens of the imaging device.

26. The system according to any one of claims 18 to 25 when dependent from claim 4 or claim 5, wherein the ultraviolet curing device is mounted to the adjustable mounting plate.

27. The system according to any one of claims 17 to 26, comprising a control module operatively in communication with the imaging device, the focusing mechanism, and the applicator.

28. The system according to claim 27, when dependent on claim 21, wherein the control module is operatively in communication with the first actuator and the second actuator.

29. The system according to claim 27, when dependent on claim 22, wherein the control module is operatively in communication with the third actuator.

30. The system according to claim 27, when dependent on claim 26, wherein the control module is operatively in communication with the ultraviolet curing device.

31. A method for focusing an imaging device, the imaging device comprising an image sensor and a lens, wherein the method comprises: adjusting the distance between the image sensor and the lens to adjust the focus of the imaging device; determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens; and preventing movement of the lens relative to the image sensor by fixing the position of the lens using a bonding agent.

32. The method according to claim 31 , wherein determining that the distance between the image sensor and the lens is such that the image sensor is substantially aligned with the focal point of the lens comprises: capturing a plurality of images of a target object via the imaging device during adjustment of the distance between the image sensor and the lens; analysing the plurality of images; determining an optimal image of the plurality of images of the target object; and controlling the adjustment of the distance between the image sensor and the lens to position the image sensor and the lens at the distance associated with the optimal image.

33. The method according to claim 31 or claim 32, comprising applying the bonding agent to the imaging device before adjustment of the distance between the image sensor and the lens.

34. The method according to claim 31 or claim 32, comprising applying the bonding agent to the imaging device during adjustment of the distance between the image sensor and the lens.

35. The method according to claim 31 or claim 32, comprising applying the bonding agent to the imaging device after adjustment of the distance between the image sensor and the lens.

36. The method according to any one of claims 31 to 35, wherein: the bonding agent is an ultraviolet-curable adhesive; and fixing the position of the lens using the bonding agent comprises curing the ultraviolet- curable adhesive.

37. The method according to claim 36, further comprising, selectively: moving the ultraviolet curing device to an operating position adjacent to the imaging device for curing of the ultraviolet-curable adhesive; and moving the ultraviolet curing device to a non-operating position away from the imaging device.

38. The method according to any one of claims 31 to 37, wherein the imaging device comprises two or more lenses and two or more respective image sensors and, for each lens of the device, the method comprises: adjusting the distance between said lens and said lens’s respective image sensor to adjust the focus of the imaging device; determining that the distance between said lens and said lens’s respective image sensor is such that the image sensor is substantially aligned with the focal point of said lens; and preventing movement of said lens relative to said lens’s respective image sensor by fixing the position of the lens using a bonding agent.

39. The method according to claim 38, wherein adjusting the distance between one of said two or more lenses and said lens’s respective image sensor is performed independently of adjusting the distance between another of said two or more lenses and said other lens’s respective image sensor.

40. An imaging device, comprising: an image sensor; and a lens positioned at a fixed distance from the image sensor; wherein the position of the lens relative to the image sensor is fixed using a bonding agent.

41. An imaging device, comprising an image sensor, a lens, a lens mount in which the lens in mounted and a lens housing configured to receive the lens mount; wherein either or eachof the lens mount and lens housing have a plurality of retaining formations, said formations defining interstices configured to receive a bonding agent.

42. The imaging device of claim 41, wherein the lens housing comprises a mounting ring configured to receive the lens mount and the mounting ring comprises retaining formations.

43. The imaging device of claim 41 or claim 42, wherein the retaining formations are a plurality of teeth in a castellated configuration.

44. The imaging device of any one of claims 41 to 43, wherein the position of the lens relative to the image sensor is fixed using a bonding agent and the imaging device comprises bonding agent within the interstices.

45. The imaging device according to any one of claims 41 to 44, wherein the imaging device is formed by the method of any one of claims 27 to 39.

Images