Patent Description:
A hand-held electronic device according to the claimed invention is defined in appended claim <NUM>.

Aspects of this disclosure will now be described by example and with reference to the drawing figures listed above. Components, process steps, and other elements that may be substantially the same in one or more embodiments are identified coordinately and described with minimal repetition. It will be noted, however, that elements identified coordinately may also differ to some degree. It will be further noted that the drawing figures are schematic and generally not drawn to scale. Unless otherwise noted, the various drawing scales, aspect ratios, and numbers of components shown in the figures may be purposely distorted to make certain features or relationships easier to see.

<FIG> shows aspects of an example handheld electronic device <NUM>. The handheld device of <FIG> includes a camera component <NUM> in two portions detachable from each other, and a retaining member <NUM> that connects the two portions. The handheld device may be embodied as a smartphone, tablet, or laptop computer system, for example. Handheld device <NUM> is configured to be transitionable, manually, between an unfolded state (drawn in solid lines) and a folded state (drawn in broken lines). The handheld device may be usable in both states, while some features of the device may be available only in one state or in the other.

Camera component <NUM> of handheld device <NUM> is not particularly limited with respect to function; it may be a digital color camera, a night-vision camera, a video camera, a depth-imaging camera, etc. As shown in <FIG>, the camera component includes an objective portion <NUM> and a sensor portion <NUM>. The objective portion is configured to collect light from a photographic subject. The sensor portion is configured to capture an image of the subject using light collected by the objective portion. Because the handheld device can be unfolded and refolded, the sensor portion is reversibly separable from the objective portion. In the embodiment of <FIG>, handheld device <NUM> is usable as a camera only in the folded state, when the objective and sensor portions are adjacent to, and aligned with each other.

By dividing camera component <NUM> into two opposing portions, the configuration of <FIG> partitions the focal length of the camera component between the two portions. This configuration allows each of the opposing portions, if engineered with equal or comparable thickness, to be relatively thin. In some embodiments, objective portion <NUM> and sensor portion <NUM> are each <NUM> to <NUM> millimeters in thickness. Each portion having equal or comparable thickness is desirable if handheld device <NUM> is engineered to lie flat in the unfolded state. Despite these advantages, other embodiments are envisaged in which the objective and sensor portions have different thicknesses.

In the embodiment of <FIG>, at least one display panel (display panel <NUM>, <NUM>', for example) is coupled to each of objective portion <NUM> and sensor portion <NUM>. Each display panel may be an organic light-emitting diode (OLED) or liquid-crystal display (LCD) panel, as nonlimiting examples. In some examples, one or more of the display panels may support a resistive or capacitive touch screen. Continuing in <FIG>, objective portion <NUM> is coupled via objective housing <NUM> to components on one side of retaining member <NUM>; the sensor portion is coupled via sensor housing <NUM> to components on the opposite side of the retaining member.

Handheld device <NUM> also includes a flash <NUM> and other hardware components not shown in <FIG>-cellular, WiFi, and Bluetooth radios, a global-positioning system (GPS) receiver, an inertial-measurement unit, for example. The various hardware components of the handheld device are operatively coupled to computer <NUM>, which includes a logic machine <NUM> and an associated electronic memory machine <NUM>. The electronic memory machine may hold instructions that cause the logic machine to execute the various computing actions and processes disclosed herein.

Continuing in <FIG>, retaining member <NUM> of handheld device <NUM> ensures that objective portion <NUM> remains connected to sensor portion <NUM> when the objective and sensor portions are aligned (such that camera component <NUM> is usable), and also when the objective portion is separated from the sensor portion. In the embodiment of <FIG>, the retaining member includes a hinge. Hinged transitioning between folded and unfolded states of the handheld device is further illustrated in the perspective drawings of <FIG> shows the handheld device in the unfolded state. <FIG> shows the handheld device in the folded state, iris <NUM> of the sensor portion aligning with aperture <NUM> of the objective portion. <FIG> shows the handheld device in a partially folded state. Despite the benefits that a folding handheld device offers, other reversibly separable camera geometries are also envisaged. In the embodiment of <FIG>, retaining member <NUM>' of handheld device <NUM>' takes the form of a slide that glides along opposite edges of objective housing <NUM> or sensor housing <NUM>. In these and other embodiments, the handheld device may include a mechanical or magnetic latch (not shown in the drawings) to discourage separation of the objective and sensor portions when aligned.

<FIG> shows aspects of an example camera portion <NUM> of handheld device <NUM>. The drawing schematically shows objective portion <NUM> and sensor portion <NUM>. Sensor portion <NUM> includes an optical sensor array <NUM>-a rectangular array of optical sensor elements configured to digitally record an image of photographic subject <NUM>. The objective portion includes a barrel lens system <NUM> that collects light from the subject and directs the light through aperture <NUM>, forming an image of the subject on the optical sensor array. <FIG> shows the objective and sensor portions in proper alignment. Naturally, the objective and sensor portions must be aligned to enable high-quality imaging of the subject. To sense the state of alignment between the objective and sensor portions, especially in view of the separability of these portions in handheld device <NUM>, camera component <NUM> incorporates an alignment-sensing system. As described in further detail below, the alignment-sensing system may be distributed among objective portion <NUM>, sensor portion <NUM>, and computer <NUM> of the handheld device.

No aspect of the drawings should be construed in a limiting sense, for numerous alternative configurations are equally envisaged. Although barrel lens system <NUM> is shown, for instance, as a single unit contained within objective portion <NUM>, other acceptable lens systems may include one or more lenses arranged in objective portion <NUM>, and one or more lenses arranged in sensor portion <NUM>. Here, the one or more lenses of the objective portion are configured to collect the light from the subject, and the one or more lenses of the sensor portion are configured to receive and convey the light to an optical sensor array of the sensor portion. This variant would still provide the advantage of dividing the focal length of the objective lens system between the objective and sensor portions. Still other examples may employ a folded optical path in which the subject image received from the objective portion is conveyed to optical sensor array <NUM> via a waveguide arranged in the sensor portion.

<FIG> shows additional aspects of objective portion <NUM> of camera component <NUM>, and <FIG> shows additional aspects of sensor portion <NUM>. In particular, <FIG> shows end face <NUM> of barrel lens system <NUM> in one non-limiting embodiment. Shown specifically is the end face of the barrel lens system that would be oriented opposite sensor portion <NUM> (and visible to one or more sensor elements of the sensor portion) in the aligned camera component <NUM>; <FIG> shows the opposing face <NUM> of the sensor portion. Arranged on end face <NUM> are a plurality of alignment markers (alignment markers 48A, 48B, 48C, for example). The number, nature, and arrangement of the alignment markers may differ in different embodiments.

As noted above, optical sensor array <NUM> of sensor portion <NUM> includes a plurality of optical sensor elements <NUM>. Additional, peripheral sensor elements <NUM>' (sensor elements 50A', 50B', 50C', for example) may be arranged on periphery <NUM> of the optical sensor array. The peripheral sensor elements may be discrete, non-imaging photodiodes, for example. In some embodiments, one or more optical sensor elements of the sensor portion are configured to sense the position of one or more of the alignment markers <NUM> when the objective and sensor portions approach alignment.

In some embodiments, alignment markers <NUM> may be self-illuminating. Each alignment marker may include a light-emitting diode (LED), for example. In other embodiments, the alignment markers may be externally illuminated. The use of non-visible light for alignment sensing may, in some examples, protect the subject image from degradation by stray light. Accordingly, each alignment marker may include a fluorescent material excitable in the ultraviolet and emissive in the infrared. To provide illumination of the alignment markers, at least when the objective and sensor portions approach alignment, one or more light emitters <NUM> (light emitters 54A, 54B, 54C, for example) are arranged on periphery <NUM> of the optical sensor array. In other embodiments, the one or more light emitters may be arranged in objective portion <NUM>. In examples in which the alignment markers are fluorescent, each light emitter may be an ultraviolet-emitting LED. In other examples, the alignment markers may be absorptive, reflective, or diffractive, and light emitters <NUM> may emit visible or infrared light. Each of the one or more alignment markers, for instance, may include a reflector to reflect the emitter light back towards sensor portion <NUM>. In other examples, the alignment markers may be less reflective than surrounding regions of end face <NUM>. The alignment markers may be embodied each as a spot of darkly colored material, for instance.

In some embodiments, one or more lenses may be arranged within camera component <NUM> to collect light from alignment markers <NUM>, to improve detection by the one or more optical sensor elements <NUM>. A lenslet, for example, may be coupled to each of the peripheral sensor elements <NUM>'. Alternatively, or in addition, a lenslet may be coupled to each of the alignment markers <NUM> and configured to focus an image of the alignment marker onto the one or more sensor elements.

Computer <NUM> is configured to return an indication of alignment between objective portion <NUM> and sensor portion <NUM> based on the output of the one or more optical sensor elements <NUM> or <NUM>'. In some embodiments, the indication of alignment may be Boolean-valued-i.e., aligned or not aligned. In other embodiments, the indication of alignment may be vector-valued, with components specifying a degree of misalignment along and/or around a plurality of different axes. Each component may include an independent measure of alignment accuracy in an associated direction-the alignment accuracy being inversely related to the degree of misalignment.

In some embodiments, the indication of alignment may include an indication of translational alignment along orthogonal X and Y axes. These axes may correspond to the horizontal and vertical directions, respectively. The indication may reveal, for example, that the objective portion is offset M pixels above and N pixels to the right of the sensor portion.

The indication of alignment may include an indication of tilt (i.e., small-angle rotational) alignment around one or more axes. Tilt alignment may be expressed relative to the optical axis of optical sensor array <NUM>. The indication may reveal, for example, that objective portion <NUM> is rotated N degrees from the optical axis of the sensor portion, in the horizontal plane.

The indication of alignment may also include an indication of focal alignment-i.e., alignment of the focal point of the subject image to the plane of optical sensor array <NUM>, with misalignment indicating displacement of the focal point behind or in front of the optical sensor array, in a direction normal to the plane.

Proper alignment between objective portion <NUM> and sensor portion <NUM> may be indicated by each alignment marker <NUM> being found at its expected coordinates. For instance, if optical sensor array <NUM> is used to sense alignment, then a given alignment marker i might be expected at pixel position (X<NUM>,i, Y<NUM>,i) of the optical sensor array. Horizontal misalignment is indicated when the alignment marker is observed at (X<NUM>,i + δ, Y<NUM>,i), or not at all. Vertical misalignment is indicated when the alignment marker is observed at (X<NUM>,i, Y<NUM>,i + δ), or not at all.

<FIG> illustrates the effect of tilt misalignment about the vertical axis on the pattern of alignment markers <NUM>. In <FIG>, image <NUM> of end face <NUM> shows the expected positions 58A, 58B, and 58C of the alignment markers and the corresponding observed positions 60A, 60B, 60C of the alignment markers. Likewise, <FIG> illustrates the effect of focal misalignment along the optical axis of optical sensor array <NUM>. Alternatively, or in addition, combined assessment of tilt and focal alignment may be based on the quality of focus of the imaged alignment markers or from the degree of keystoning of the alignment-marker pattern, with reference to an appropriate camera model.

In embodiments in which peripheral sensor elements <NUM>' are used to detect corresponding alignment markers <NUM>, each peripheral sensor element may report a Boolean figure of merit-i.e., aligned versus not aligned-or, for small amounts of misalignment, an analog surrogate of the distance between an alignment marker and its expected position. When analog-surrogate data from a plurality of peripheral sensors are processed together-e.g., fit to a polynomial-a detailed assessment of the state of alignment may be obtained.

Alignment sensing in camera component <NUM> may rely on other principles of operation besides locating alignment markers <NUM> per se. In some embodiments, as shown in <FIG>, each alignment marker may take the form of a scratch or embossed line formed in end face <NUM> of objective portion <NUM>. A great many alignment features of this kind may be arranged on the end face, together constituting a diffraction grating <NUM> or other hologram. Light emitter <NUM> of opposing face <NUM> may take the form of a diode laser arranged on the periphery <NUM> of optical sensor array <NUM>. The diffraction grating or hologram may be configured, when excited by the laser, to project an interference pattern onto the optical sensor array. The interference pattern may include alternating bright and dark bands, for instance, the position of which may be used to assess alignment between objective portion <NUM> and sensor portion <NUM>.

In still other embodiments, alignment sensing may take advantage of the fact that objective portion <NUM> will naturally project an image of aperture <NUM> onto optical sensor array <NUM> when objective portion <NUM> and sensor portion <NUM> approach a state of alignment, provided that subject <NUM> is adequately illuminated. An oversized optical sensor array may be configured to capture the image of the aperture. Computer <NUM> may be configured to return an indication of alignment of the objective and sensor portions based on the image of the aperture as captured by the optical sensor array.

As in the previous embodiments, the indication of alignment may include an indication of translational alignment and an independent indication of tilt and/or focal alignment. When objective portion <NUM> is perfectly aligned to sensor portion <NUM>, the image of aperture <NUM> on optical sensor array <NUM> is a circle <NUM> of a predetermined radius, centered at predetermined coordinates (X<NUM>, Y<NUM>) of the optical sensor array, as shown in <FIG>. The effect of tilt misalignment is to compress the circle into an ellipse <NUM>, also shown in <FIG>. The effect of focal misalignment is to blur and change the diameter of the circle (or ellipse, if tilt misalignment is also present), as shown in <FIG>. The effect of horizontal misalignment is to shift the center of the circle (or focus of the ellipse) to the left or right, as shown in <FIG>. The effect of vertical misalignment is to shift the center of the circle (or focus of the ellipse) up or down, as shown in <FIG>.

In view of the foregoing analysis, the image of the aperture on the optical sensor array <NUM> is understood to be elliptical in general terms. The indication of tilt alignment assessed in this embodiment may vary based on the eccentricity of the elliptical image of the aperture (e.g., the ratio of the distance between the two foci of the ellipse to the length of the major axis). The indication of focal alignment may vary based on the diameter of the elliptical image of the aperture (e.g., the length of the major axis). The indication of translational alignment may vary based on the position of the center of the elliptical image of the aperture. In order to evaluate the eccentricity, diameter, and position of the elliptical center, computer <NUM> may be configured to apply a curve-fitting routine to the high-contrast boundary of the aperture image.

Computer <NUM> may be configured to schedule alignment sensing operations so as to usefully inform, but not interfere with, subject image capture. For instance, alignment sensing may be enacted automatically every time handheld device <NUM> is folded shut, or handheld device <NUM>' is slid into the closed position. In other examples, alignment sensing may be triggered by a user request to capture a subject image, provided that a certain period of time has elapsed since the previous image capture. In other examples, alignment sensing may be enacted immediately before every subject image capture.

The ability to sense misalignment between objective portion <NUM> and sensor portion <NUM> enables various actions to be taken to improve the user experience associated with handheld device <NUM>. In the simplest case, camera component <NUM> may be deactivated and/or the user alerted when significant misalignment is sensed. This action may prevent the user from recording images destined to be unsatisfactory. In other embodiments, corrective action may be taken to improve the quality of the captured image. The corrective action may include correcting the image digitally, when the degree of misalignment is not severe. In still other embodiments, handheld device <NUM> may include electromotive componentry configured to dynamically realign the objective or sensor portions, to ensure quality imaging.

Returning now to <FIG>, camera component <NUM> includes a linear actuator <NUM> configured to move objective portion <NUM> pursuant to control signals from computer <NUM>. In other embodiments, the linear actuator may be configured to move sensor portion <NUM>. In either case, the computer may be configured to control the linear actuator responsive to an indication of alignment of objective portion <NUM> and sensor portion <NUM>, so as to properly align the objective and sensor portions. The indication may be received from the alignment sensing system of the camera component, as described hereinabove.

The mode of operation of linear actuator <NUM> is not particularly limited. The linear actuator may be electromechanical or piezoelectric, for example. <FIG> shows aspects of a piezoelectric linear actuator <NUM> in one embodiment.

In some embodiments, camera component <NUM> may include a plurality of linear actuators configured to move (translate or tilt) objective portion <NUM> or sensor portion <NUM> in a corresponding plurality of directions. <FIG> shows an example sensor portion <NUM>' having three different translational linear actuators 68X, 68Y, and 68Z. <FIG> provides an exploded view of sensor portion <NUM>'. In this embodiment, each of the translational linear actuators is coupled to a corresponding floating stage of the sensor portion-stages 70X, 70Y, and 70Z, specifically. In other embodiments, the linear actuators may instead be configured to move objective portion <NUM>, and the floating and/or rotating stages would then be arranged in the objective portion.

In some embodiments, a linear actuator may be configured to address focal misalignment of objective portion <NUM> relative to sensor portion <NUM>. As shown in <FIG>, a linear actuator 68Z may be configured to slide one transparent wedge <NUM> along another, to increase the effective optical path between the objective and sensor portions, by moving the objective or sensor portion in the depth direction. Despite the utility of using a linear actuator for depth adjustment, other actuators and/or focal-correcting strategies are equally consonant with this disclosure. One alternative is to incorporate an electrooptical lens having an electronically tunable focal length, in one or both of the objective and sensor portions. In <FIG>, for example, lens <NUM> may be an electrooptical lens.

In some embodiments, floating stage 70Z may be replaced by a rotational stage <NUM>, as shown in <FIG>, having a fulcrum <NUM>. Linear actuator 68R, with little or no modification, could then effect tilt realignment of the objective or sensor portion.

In accordance with the claimed invention, camera component <NUM> includes a plurality of linear actuators configured to move the objective or sensor portion in the same direction. Accordingly, <FIG> shows an outer linear actuator <NUM> and an inner linear actuator 68I. The outer linear actuator has a longer stroke and is more frequency-damped than the inner actuator. The outer linear actuator moves a floating stage <NUM> on which the inner actuator is coupled. The inner linear actuator moves floating stage 70I, on which optical sensor array <NUM> may be coupled. In some embodiments, the inner linear actuator may provide optical image stabilization (OIS) for camera component <NUM>. In alternative embodiments, the inner linear actuator may provide the longer stroke.

It was noted above that alignment sensing in handheld device <NUM> may be scheduled to inform, but not interfere with subject-image capture. The same is true of the active realignment methods disclosed herein. In particular, computer <NUM> may be configured to schedule the realignment automatically upon closure of the handheld device, at the first user request to capture a subject image since the handheld device was folded closed, before every subject capture, etc. In some embodiments, alignment sensing and active realignment may be enacted together, in a closed-loop manner, to ensure proper alignment of camera portion <NUM>.

The methods and processes described herein may be tied to a computer system of one or more computer devices.

<FIG> schematically shows a non-limiting embodiment of a computer <NUM> of handheld device <NUM> that can enact one or more of the methods and processes described above.

Computer <NUM> includes a logic machine <NUM> and an associated electronic memory machine <NUM>. Computer <NUM> may be operatively coupled to a display subsystem, input subsystem, communication subsystem, and/or other components not shown in <FIG>.

Logic machine <NUM> may be one of a plurality of logic machines configured to execute software instructions. Logic machines of computer <NUM> may be single-core or multi-core, and the instructions executed thereon may be configured for sequential, parallel, and/or distributed processing. Individual components of the computer optionally may be distributed among two or more separate devices, which may be remotely located and/or configured for coordinated processing.

Electronic memory machine <NUM> includes one or more physical devices configured to hold instructions executable by logic machine <NUM> to implement the methods and processes described herein. When such methods and processes are implemented, the state of electronic memory machine <NUM> may be transformed-e.g., to hold different data.

Electronic memory machine <NUM> may include removable and/or built-in devices. Electronic memory machine <NUM> may include semiconductor memory (e.g., RAM, EPROM, EEPROM, etc.), and/or magnetic memory. Electronic memory machine <NUM> may include volatile, nonvolatile, dynamic, static, read/write, read-only, random-access, sequential-access, location-addressable, file-addressable, and/or content-addressable devices.

It will be appreciated that electronic memory machine <NUM> includes one or more physical devices.

Aspects of logic machine <NUM> and electronic memory machine <NUM> may be integrated together into one or more hardware-logic components.

The terms 'module,' 'program,' and 'engine' may be used to describe an aspect of computer <NUM> implemented to perform a particular function. In some cases, a module, program, or engine may be instantiated via logic machine <NUM> executing instructions held by electronic memory machine <NUM>. It will be understood that different modules, programs, and/or engines may be instantiated from the same application, service, code block, object, library, routine, API, function, etc. Likewise, the same module, program, and/or engine may be instantiated by different applications, services, code blocks, objects, routines, APIs, functions, etc. The terms 'module,' 'program,' and 'engine' may encompass individual or groups of executable files, data files, libraries, drivers, scripts, database records, etc..

It will be appreciated that a 'service', as used herein, is an application program executable across multiple user sessions.

When included, a display subsystem may be used to present a visual representation of data held by electronic memory machine <NUM>. As the herein described methods and processes change the data held by the storage machine, and thus transform the state of the storage machine, the state of the display subsystem may likewise be transformed to visually represent changes in the underlying data. The display subsystem may include one or more display devices utilizing virtually any type of technology. Such display devices may be combined with logic machine <NUM> and/or electronic memory machine <NUM> in a shared enclosure, or such display devices may be peripheral display devices.

When included, an input subsystem may comprise or interface with one or more user-input devices such as a keyboard, mouse, touch screen, or game controller. Example NUI componentry may include a microphone for speech and/or voice recognition; an infrared, color, stereoscopic, and/or depth camera for machine vision and/or gesture recognition; a head tracker, eye tracker, accelerometer, and/or gyroscope for motion detection and/or intent recognition.

When included, a communication subsystem may be configured to communicatively couple computer <NUM> with one or more other computing devices. The communication subsystem may include wired and/or wireless communication devices compatible with one or more different communication protocols. In some embodiments, the communication subsystem may allow computer <NUM> to send and/or receive messages to and/or from other devices via a network such as the Internet.

One aspect of this disclosure is directed to a camera comprising an objective portion, a sensor portion, an alignment-sensing system, an actuator, and a computer. The objective portion is configured to collect light from a subject. The sensor portion is reversibly separable from the objective portion; it includes an array of optical sensor elements. The alignment-sensing system is configured to sense alignment between the objective portion and the sensor portion. The actuator is configured to move the objective or sensor portion. The computer is configured to control the actuator responsive to output of the alignment-sensing system, so as to bring the objective and sensor portions into alignment.

In some implementations, the actuator is a linear actuator configured to move the objective portion. In some implementations, the actuator is a linear actuator configured to move the sensor portion. In some implementations, the alignment-sensing system is an optical system. In some implementations, the actuator is a piezoelectric actuator. In accordance with the claimed invention, the actuator is one of a plurality of linear actuators configured to move the objective or sensor portion in a corresponding plurality of directions. In some implementations, the plurality of directions include a horizontal direction perpendicular to an optical axis of the camera and a vertical direction perpendicular both to the optical axis and to the horizontal direction. In some implementations, the plurality of directions includes a depth direction parallel to the optical axis. In accordance with the claimed invention, the plurality of linear actuators includes outer and inner actuators configured to move the objective or sensor portion in the same direction, the outer actuator has a different stroke and is differently frequency-damped than the inner actuator, and the outer actuator moves a floating stage on which the inner actuator is coupled. In some implementations, the inner actuator provides optical image stabilization for the camera. In some implementations, the actuator is a linear actuator configured to slide one optical wedge along another to increase an optical path in the objective or sensor portion and thereby move the objective or sensor portion in the depth direction. In some implementations, the objective or sensor portion includes an electrooptical lens having an electronically tunable focal length.

Another aspect of this disclosure is directed to an electronic device comprising an objective portion, a sensor portion, an alignment-sensing system, an actuator, a computer, and a retaining member. The objective portion is configured to collect light from a subject. The sensor portion is reversibly separable from the objective portion; it includes an array of optical sensor elements. The alignment-sensing system is configured to sense a state of alignment between the objective portion and the sensor portion. The linear actuator is configured to move the objective or sensor portion. The computer is configured to control the linear actuator responsive to output of the alignment-sensing system, so as to bring the objective and sensor portions into alignment. The retaining member is configured to couple the objective portion to the sensor portion when the objective and sensor portions are aligned and also when the objective portion is separated from the sensor portion.

In some implementations, the retaining member is a hinge. In some implementations, the retaining member is a slide. In some implementations, the electronic device further comprises a mechanical or magnetic latch to discourage separation of the objective and sensor portions. In some implementations, the objective portion is coupled to a first display panel and the sensor portion is coupled to a second display panel.

Another aspect of this disclosure is directed to a camera comprising an objective portion, a sensor portion, an alignment-sensing system, a translational linear actuator, a rotational linear actuator, and a computer. The objective portion is configured to collect light from a subject. The sensor portion is reversibly separable from the objective portion; it includes an array of optical sensor elements. The alignment-sensing system is configured to sense alignment between the objective portion and the sensor portion. The translational linear actuator is configured to shift the objective or sensor portion. The rotational linear actuator is configured to tilt the objective or sensor portion. The computer is configured to control the translational and rotational linear actuators responsive to output of the alignment-sensing system, so as to bring the objective and sensor portions into alignment.

In some implementations, the translational linear actuator is coupled to a floating stage of the objective or sensor portion. In some implementations, the rotational linear actuator is coupled to a rotating stage of the objective or sensor portion.

Claim 1:
A hand-held electronic device (<NUM>) comprising a camera component (<NUM>), the device comprising:
an objective portion (<NUM>) configured to collect light from a subject (<NUM>);
a sensor portion (<NUM>) reversibly separable from the objective portion (<NUM>), the sensor portion including an array of optical sensor elements (<NUM>);
an alignment-sensing system configured to sense alignment between the objective portion (<NUM>) and the sensor portion (<NUM>);
a retaining member (<NUM>) configured to couple the objective portion (<NUM>) to the sensor portion (<NUM>) when the objective and sensor portions (<NUM>) are aligned and also when the objective portion is separated from the sensor portion,
a plurality of linear actuators (<NUM>) configured to move the objective or sensor portion in a corresponding plurality of directions;
a computer (<NUM>) configured to control one or more of the plurality of linear actuators (<NUM>) responsive to output of the alignment-sensing system, so as to bring the objective and sensor portions (<NUM>) into alignment;
wherein the plurality of linear actuators (<NUM>) includes outer and inner actuators configured to move the objective or sensor portion (<NUM>) in the same direction;
wherein the outer actuator has a different stroke and is differently frequency-damped than the inner actuator;
wherein the outer actuator moves a floating stage (70O, 70Z) on which the inner actuator is coupled.