Abstract: An interchangeable lens unit comprises a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, and a focus motor. The zoom ring unit mechanically transmits operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor electrically drives the focus lens unit in the Z axis direction with respect to the second lens group unit. When the zoom ring is operated in a state in which no power is being supplied to the focus motor, a gap is always ensured in the Z axis direction between the focus lens unit and the second lens group unit.

Abstract: An insertion unit has a channel through which a treatment tool can be inserted. A distal end of the insertion unit has a single-focus objective optical system or a focal-point-variable objective optical system to focus the optical image on a light receiving surface of an image capturing element. At a short object distance from the distal end, an image signal with a sufficient resolution is obtained from the image capturing element. In this state, a treatment tool projected by a reduced amount from a distal end opening of the channel is captured on a light receiving surface of the image capturing element. A required resolution is also provided for a far side.

Abstract: An optical apparatus includes a cam barrel configured to hold an optical member, which is movable back and forth along a first optical axis, on an inner periphery of the cam barrel, a bending member configured to bend a light flux from an object from the first optical axis towards a second optical axis, and a guiding member extending in a direction parallel with the second optical axis and configured to support and hold the bending member to be movable back and forth in the direction parallel with the second optical axis, wherein the guiding member is configured to enter into a notch, which is provided to the cam barrel, when the optical member is stored into a space along the first optical axis into which the bending member has retracted.

Abstract: A lens barrel includes a first zoom/focus lens group and a second zoom/focus lens group configured to respectively vary a focal distance and imaging distance by moving in an optical axis, a first actuator configured to drive the first zoom/focus lens group, and a second actuator configured to drive the second zoom/focus lens group.

Abstract: The present disclosure relates to an apparatus and method for auto focusing camera module, the apparatus including a DFoV value measurer measuring a DVoF value of a lens; storage stored with a designed DFoV value of a lens, a controller comparing the DVoF value of a lens measured by the DVoV value measurer with the designed DFoV value of a lens stored in the storage to recognize an initial position of a lens, and a lens mover focusing the lens by winding the lens or by unwinding the lens in response to the initial position of the lens recognized by the controller.

Abstract: A lens control apparatus, and an interchangeable lens including the lens control apparatus, are provided which can obtain, in zoom tracking operation, excellent optical images at subject distances in a wider range. A lens control apparatus controls drive of an optical system including a first and a second focus lens for adjusting a focus state and a zoom lens for adjusting an angle of view. The lens control apparatus includes: a first driver that drives the first focus lens; a second driver that drives the second focus lens; a controller that controls the first and second drivers; and a storage unit that stores first and second tracking data, the first and second tracking data each being information that associates a position of the first and second focus lenses respectively with a position of the zoom lens for focusing on a subject.

Abstract: A lens apparatus is switchable between first and second modes. A control master determination unit a lens apparatus as one of a master and a slave when the lens apparatus is operated in the second mode. A command value transmit-receive unit transmits/receives a command value of a target of the lens apparatus to/from another lens apparatus in the second mode, wherein the lens apparatus drives the target according to a command value from a controller for the lens apparatus for the target for which the lens apparatus is the master, and drives the target according to a command value received through the command value transmit-receive unit for the target for which the lens apparatus is set as the slave.

Abstract: An electronic camera includes an imager. The imager includes an imaging surface capturing an object scene image through a zoom lens and a focus lens. When accepting a zoom instruction, a first changer changes a distance from the zoom lens to the imaging surface. With reference to a tracking curve, a second changer executes a process for changing the distance from the focus lens to the imaging surface, in parallel with the change process executed by the first changer. A limiter limits the change process of the second changer when a change manner by the first changer satisfies a predetermined condition.

Abstract: According to one embodiment, a lens drive device comprises: a housing; a yoke provided on the inside of the housing; a magnet secured to the yoke; a carrier which is located on the inside of the yoke and which is provided with a lens; a coil which is connected to the carrier and which interacts with the magnet; a spring for resiliently supporting the carrier; and a magnetic member connected to the carrier.

Abstract: A lens apparatus includes a zoom, a focus, a zoom position control signal generator, a focus position control signal generator, a first calculator for calculating a present angle of field from zoom and focus positions, a second calculator for calculating a second angle of field based on a zoom control signal and a focus position, a third calculator for calculating a third angle of field based on zoom and focus position control signals, used when the second calculation unit calculates, a base angle-of-field determinater for determining a sum of the present angle of field and a value obtained by subtracting the third angle of field from the second angle of field, as a base angle of field, and a zoom position control determinater for determining a zoom position to a position of the zoom lens corresponding to the base angle of field to which the zoom lens is driven.

Abstract: A lens system includes: a lens unit; a drive unit driving the lens unit in an optical axis direction; a detector detecting a position of the lens unit; a lens operation unit that operates driving of the lens unit; and a computing unit that computes a positional command value for controlling driving of the lens unit based on a signal input from the lens operation unit and controls driving of the lens unit; a time setting unit; and a threshold setting unit setting a positional difference threshold for switching the first and second current values set in the drive unit. When the difference between the positional command value and the lens position is larger than the positional difference threshold and duration after the second current value is set has not exceeded the high-current maximum time, the second current value is set. In other cases, the first current value is set.

Abstract: An apparatus is provided including a voice coil motor (VCM); a lens connected to the voice coil motor; and a pulse-width modulation (PWM) driver connected to the voice coil motor to at least partially control movement of the lens by the voice coil motor.

Abstract: An auto focus image system that includes a pixel array coupled to a focus signal generator. The pixel array captures an image that has at least one edge with a width. The focus signal generator may generate a focus signal that is a function of the edge width and/or statistics of edge widths. A processor receives the focus signal and/or the statistics of edge widths and adjusts a focus position of a focus lens. The edge width can be determined by various techniques including the use of gradients. A histogram of edge widths may be used to determine whether a particular image is focused or unfocused. A histogram with a large population of thin edge widths is indicative of a focused image. The generator may eliminate an edge having an asymmetry of a gradient profile of an image signal. The generator may also eliminate an edge that fails a template for an associated peaking of the gradient.

Abstract: A rotary actuator includes a multi-polar magnet, in which north and south poles are alternately arranged in a circumferential direction, the multi-polar magnet being shaped into one of a circular ring and a circular arc member; and a coil body having coils which are provided around the multi-polar magnet to be capable of moving in the circumferential direction of the multi-polar magnet, each of the coils substantially lying on a plane that extends in a radial direction of the multi-polar magnet and orthogonal to the circumferential direction of the multi-polar magnet. The north and south poles of the multi-polar magnet are positioned apart from each other by a predetermined interval in the circumferential direction. Dimensions of each coil are predetermined so that length of each coil in the circumferential direction is associated with the predetermined interval. Predetermined currents are passed through the coils in a properly phased manner.

Abstract: An autofocus device, comprises: a stage for mounting a sample; an objective lens; a focusing unit driving stage or the objective lens in an optical axis direction in order to control the position relative to each other of the stage and the objective lens; a lighting unit onto the sample; a detection unit detecting an optical image; a projection state changing unit being provided in an optical path, changing a state of the optical image projected onto the detection unit; a first in-focus state determination unit determining an in-focus state of the sample on the basis of a detection result; and a first in-focus state adjustment unit controlling a position of the projection state changing unit such that a state in which the stage and the objective lens are held at prescribed positions under control of the driving unit is determined to be an in-focus state.

Abstract: A lens apparatus that is switchable between a first and a second modes, including: a control master determination unit for determining the lens apparatus as one of a master and a slave for each target to be controlled of the lens apparatus when the lens apparatus is operated in the second mode; and a command value transmit-receive unit for transmitting/receiving a command value of the target of the lens apparatus to/from the another lens apparatus when the lens apparatus is operated in the second mode, in which the lens apparatus drives the target according to a command value from a controller for the lens apparatus for the target for which the lens apparatus is set as the master, and drives the target according to a command value received through the command value transmit-receive unit for the target for which the lens apparatus is set as the slave.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system, in order from an object side to an image side, comprises at least: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having negative optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.

Abstract: A linear motion control device for use in a linear control system is presented. The linear motion control device includes a coil driver to drive a coil that, when driven, effects a linear movement by a motion device having a magnet. The linear motion control device also includes a magnetic field sensor to detect a magnetic field associated with the linear movement and an interface to connect an output of the magnetic field sensor and an input of the coil driver to an external controller. The interface includes a feedback loop to relate the magnetic field sensor output signal to the coil driver input.

Abstract: A variable focal lens which does not require a reduction of a zoom factor and eliminates an origin sensor is provided. A microcomputer 15 functions as a focus adjustment section which controls a stepper motor 13 to move a focusing ring 5 for a focus adjustment. The microcomputer 15 causes the focusing ring 5 to move by a first moving distance in a first moving direction toward one of a FAR side and a NEAR side, and then to move the focusing ring 5 by a second moving distance in a second moving direction opposite to the first moving direction, and set the point where the focusing ring reaches after the movement in the second moving direction as a reference point for adjustment, and the microcomputer 15 causes the focusing ring 5 to move from the reference point for adjustment in the first moving direction within a range equal to or less than the second moving distance to carry out the focus adjustment.

Abstract: Provided is a lens apparatus including: an image pickup optical system including a focus lens and a zoom lens; a focus detector for detecting a focus state of the image pickup optical system; a defocus amount calculation unit for calculating a defocus amount based on a result of a detection performed by the focus detector; a driving amount calculation unit for calculating a driving amount necessary to drive the focus lens to a focus position based on the defocus amount calculated by the defocus amount calculation unit; and a controller for controlling a driving of the focus lens, in which the controller controls a driving speed of the focus lens depending on the defocus amount calculated by the defocus amount calculation unit and the driving amount calculated by the driving amount calculation unit.

Abstract: An automatic focusing mechanism comprises a plurality of lenses and an image sensor disposed along an optical axis, an electromagnetic driving device for generating an electromagnetic force to drive the image sensor to move along the optical axis, and a position-limited device for limiting the movement of the image sensor along the optical axis. The image sensor is driven by the electromagnetic force and moved along the optical axis, and the distance between the lenses and the image sensor is properly adjusted, thereby realizing automatic focusing.

Abstract: A compact auto focus lens module includes a piezoelectric actuator, an elastic element, at least two guiding fixtures, and a lens barrel with an optical lens set therein. By elastic force of the elastic element, a friction is generated between the lens barrel and the piezoelectric actuator. While being applied with a voltage, the lens barrel driven by the movement of the piezoelectric actuator moves along the optical axis under the guidance of the guiding fixtures. Due to fewer elements, compact volume, and light weight, the design is applied to a miniature auto focus lens modules so as to achieve effects of fast movement, stable focusing and reduced tilting.

Abstract: In an autofocusing zoom lens, a depth of focus ? is obtained based on an aperture value Fno of a variable diaphragm and a diameter of a permissible circle of confusion ?. A focal position variation amount ?sk for a predetermined positional displacement amount ?Fp0 of a focusing lens unit is obtained according to a position Fp of the focusing lens unit and a variable magnification state Zp. If a predetermined variation amount ?Fp of the focusing lens unit satisfies a first condition, the focusing lens unit is not driven. If the first condition is not satisfied and a second condition is satisfied, the focusing lens unit is driven based on a second autofocusing unit, and if the second condition is not satisfied, the focusing lens unit is driven based on a first autofocusing unit.

Abstract: Provided is a zoom lens including: a focus lens unit which moves during focusing; and a magnification-varying lens unit which moves during zooming, in which when the magnification-varying lens unit is moved in a direction in which a depth of focus deepens, a focus operation using the focus lens unit is stopped.

Abstract: A lens position detecting device includes a lens, a lens driver for moving the lens in the optical axis direction, a lens drive command unit for outputting a drive command to the lens driver, a position detector for detecting that the lens is located at a predetermined position, and a first reference position detector that moves the lens to a first position upon starting a detecting operation, receives an output signal from the position detector while moving the lens in one direction along the optical axis direction from the first position, and detects a reference position of the lens based on the output signal.

Abstract: An interchangeable lens unit comprises a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, and a focus motor. The zoom ring unit mechanically transmits operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor electrically drives the focus lens unit in the Z axis direction with respect to the second lens group unit. When the zoom ring is operated in a state in which no power is being supplied to the focus motor, a gap is always ensured in the Z axis direction between the focus lens unit and the second lens group unit.

Abstract: A lens apparatus comprises a barrel 100 which houses an imaging optical system including magnification-varying lens units 26 and 27, a focus lens unit 25, and a beam separation element 29 which separates a part of a light beam from an object out of a light beam directed to an imaging surface, operating members 1, 2, and 3 disposed on an outer circumference of the barrel and configured to be manually operated, a drive unit 200 disposed outside the barrel and including actuators 45 and 50 which drives each of the magnification-varying lens unit and the focus lens unit, and a controller 60 which controls the actuator, and a focus detector 31 disposed outside the barrel and configured to detect a focus state of the imaging optical system using the light beam separated by the beam separation element. The focus detector is embedded in the drive unit.

Abstract: A method and apparatus is described that allows the width of fine line structures ablated or cured by a focussed laser beam on the surface of flat substrates to be dynamically changed while the beam is in motion over the substrate surface while simultaneously maintaining the beam focal point accurately on the surface. A three-component variable optical telescope is used to independently control the beam diameter and collimation by movement of first and second optical components relative to the third optical component. The method allows different focal spot diameters and different ablated or cured line widths to be rapidly selected and ensures that the beam shape in the focal spot remains constant and the depth of focus is always maximized.

Abstract: An image pickup apparatus includes a magnification information acquisition unit configured to acquire information on an image pickup magnification of an image pickup optical system, and a controller configured to select a first focus control that stops a focus control after an on-focus state of the image pickup optical system is obtained by the focus control, and a second focus control that continues the focus control even after the on-focus state of the image pickup optical system is obtained by the focus control. The controller sets the first focus control mode when the information on the image pickup magnification is information corresponding to image pickup magnification smaller than a predetermined value, and the controller sets the second focus control mode when the information on the image pickup magnification is information corresponding to image pickup magnification equal to or larger than the predetermined value.

Abstract: A driver includes: a first member that holds a lens; a second member to which the first member is fixed; and drive means for driving the second member, wherein a portion in which at least part of the drive means is accommodated is provided in the side surface of the second member.

Abstract: An image processor includes a zoom lens for performing optical zooming by moving in a first range, an imaging unit for converting an object image obtained via a zoom lens into an image signal, and an electronic zooming unit for performing an electronic zooming operation on the image signal. The electronic zooming unit performs the electronic zooming operation as a result of moving the zoom lens into a second range when the zoom lens is in the first range and outside the second range.

Abstract: A lens driving device, comprises a base; a casing fixed to the base; a coil bracket disposed within the casing; a coil wound on the coil bracket, a spring disposed within the casing, a drive rod; and a lens holder; wherein, one end of the spring is fixed to the base; one end of the drive rod is fixed to the other end of the spring, and the other end of the drive rod extends out of the casing. The lens holder is slidably fixed to the exposed portion of the drive rod. The lens holder is held stationary with respect to the drive rod by static friction between the drive rod and the lens holder. A driving signal may be applied to the coil to move the lens holder. The driving signal has the characteristic of making the current flowing through the coil slowly increase and then rapidly decrease, or to rapidly increase and then slowly decrease. The drive current is preferably a sawtooth pulse train, with each pulse causing movement of the lens holder in the micron range or below.

Abstract: A lens apparatus including an optical element includes a motor configured to drive the optical element; a position detector configured to detect a relative position of the optical element; and a controller configured to detect an origin of the optical element by returning the optical element to the origin by controlling the motor. The controller controls the motor so that a speed of the optical element moving to the origin is higher than a speed of the optical element moved by an operation of an operator.

Abstract: A variable power optical system composed of a first optical part, a second optical part, and a third optical part, with the first optical part being movable with respect to the second and third optical parts to change the focal length of the entire system. The first optical part is movably held between the second optical part and the third optical part. The first optical part moves in the direction perpendicular to the optical axis over a distance between the position on the optical system of the entire system and the position of retraction from the optical axis of the entire system.

Abstract: An autofocus system and method designed to account for instabilities in the system, e.g. due to instabilities of system components (e.g. vibrating mirrors, optics, etc) and/or environmental effects such as refractive index changes of air due to temperature, atmospheric pressure, or humidity gradients, is provided. An autofocus beam is split into a reference beam component (the split off reference channel) and a measurement beam component, by a beam splitting optic located a predetermined distance from (and in predetermined orientation relative to) the substrate, to create a first space between the beam splitting optic and the substrate. A reflector is provided that is spaced from the beam splitting optic by the predetermined distance, to create a second space between the reflector and the beam splitting optic.

Abstract: A lens barrel 11 is mounted in a collapsible imaging device 1 and includes a third lens frame 55. The third frame 55 is a lens frame to which correction lenses L5, L6, L7 are mounted and includes a shutter unit 57, a vibration compensation actuator 71, a lens frame main body 95, a focus lens frame 105, and a focus motor 115. The focus lens frame 105 is urged against the lens frame main body 95 toward the image plane side by means of a focus spring 110. A motor section 117 of the focus motor 115 is arranged in a region interposed between two multilayer printed circuit boards 77, 79 when viewed from the image plane side or the object side.

Abstract: An exemplary focusing method for enhancing resolution of an optical system is provided. The method includes: focusing on an object and obtaining an image of the object by a lens assembly of the optical system, using a designated point within a motion range of an auto focusing (AF) lens in the lens assembly to calculate; determine a first coordinate and a second coordinate of the AF lens according to resolution of the image; obtaining a direction and distance for positioning the AF lens according to the two coordinates, driving the AF lens to move along the direction of motion, and limiting the range of motion of the AF lens to obtain an optimum focusing location to focus on the object according to the motion distance. A related system is also provided.

Abstract: A lens apparatus comprises a barrel 100 which houses an imaging optical system including magnification-varying lens units 26 and 27, a focus lens unit 25, and a beam separation element 29 which separates a part of a light beam from an object out of a light beam directed to an imaging surface, operating members 1, 2, and 3 disposed on an outer circumference of the barrel and configured to be manually operated, a drive unit 200 disposed outside the barrel and including actuators 45 and 50 which drives each of the magnification-varying lens unit and the focus lens unit, and a controller 60 which controls the actuator, and a focus detector 31 disposed outside the barrel and configured to detect a focus state of the imaging optical system using the light beam separated by the beam separation element. The focus detector is embedded in the drive unit.

Abstract: In an optical zoom tracking apparatus and method, and a computer-readable recording medium for performing the optical zoom tracking, the optical zoom tracking apparatus commands a focus lens to move according to a continuous zooming operation, such that a clear image can be maintained while the image is continuously zoomed in or out, resulting in the effective use of limited power if an optical zoom function of a digital camera or mobile phone is executed. The optical zoom tracking apparatus includes: a zoom lens, a focus lens interoperable with the zoom lens, a zoom-lens drive moving the zoom lens, a focus-lens drive moving the focus lens, and a focus-lens controller for determining a moving distance of the focus lens according to a moving distance of the zoom lens, and transmitting a control signal corresponding to the moving distance of the focus lens to the focus-lens drive.

Abstract: An interchangeable lens unit includes a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, a focus motor, and a photosensor. The zoom ring unit is arranged to mechanically transmit operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor is configured to electrically drive the focus lens unit in the Z axis direction with respect to the second lens group unit. The photosensor is configured to detect whether or not the focus lens unit is disposed at a starting point position with respect to the second lens group unit. The starting point position is disposed within the total movement range E of the focus lens unit.

Abstract: A camera module in which a lens holder holding one or more optical lenses is movable in the direction of the optical axis and in which an auto-focus function and a zoom function are incorporated is reduced in size and weight. A bearing section is formed in the lens holder, and a drive shaft is inserted in the bearing section. An operation part of a piezo element is made to be in contact with the drive shaft. The surface of that first part of the drive shaft which is in contact with the operation part and the surface of that second part which slides on the bearing section are differently processed.

Abstract: A lens drive device capable of preventing a lens holder from inclining with respect to the optical axis direction of a lens is provided. A first gear (13), a second gear (14), a protrusion (20a), and a coil spring (6) are coaxially supported by a shaft (5), which is a fixed shaft. The rotational motion is transmitted to a two-stage gear (12) by rotating a rotor (11a) of a step motor (11) clockwise or counterclockwise. The rotational motion of the two-stage gear (12) is in turn transmitted to the first gear (13) and the second gear (14). When the first gear (13) and the second gear (14) rotate, the degree of engagement between an internally threaded portion (131a) of the first gear (13) and an externally threaded portion (141a) of the second gear (14) increases, and the second gear (14) moves upward. As the second gear (14) moves upward, a lens holder (20), urged upward by the elastic force of the coil spring (6), moves upward along the optical axis of a lens (21).

Abstract: The present invention provides a control device capable of improving hysteresis characteristics of a voice coil motor (31) and attaining a suitable lens position without complicating the structure of the control device. As solving means of the invention, a voice coil motor control device (30) includes a driving current control part (34) that controls a driving current supplied to the voice coil motor (31) in accordance with a driving pulse subjected to pulse width modulation, and a driving pulse control part (32) that divides a drive period of the voice coil motor (31) into a movement period and a holding period, and controls the driving pulse by changing the duty ratio of the driving pulse during the movement period in accordance with a duty setting value and fixing the duty ratio of the driving pulse during the holding period to the duty setting value.

Abstract: A position detecting device includes an optical position detecting element and a position information portion which are disposed so as to be opposed to each other. The position information portion has a binary pattern where a high light efficient portion and a low light efficient portion are alternately repeated when the movable portion moves in a predetermined direction. The position detecting device includes a loose position detecting portion for detecting a loose position of the movable portion by counting a pulse signal obtained by the optical position detecting element, a close position detecting portion for detecting a close position of the movable portion by counting pulse number of driving pulses which are applied to an electromechanical transducer from a position where the loose position detection is carried out, and a combining arrangement for combining the loose position with the close position to calculate a current position of the movable portion.

Abstract: The invention relates to an objective module comprising an optical zoom lens group (2) and a focusing optical lens group (4), the combined optical axes forming the optical axis (7) of the objective, and an electrical drive for the two lens groups. According to the invention, the electrical drive of the cited lens groups is embodied in the form of two linear ultrasonic motors (9, 11), each of the two ultrasonic motors consisting of a piezoelectric plate (12) comprising two friction elements (14) which are pressed against the opposing front sides and form the mobile elements of the ultrasonic motors together with the pressure elements (15). Each of the mobile elements is elastically connected to the corresponding lens group. The ultrasonic motors are arranged in such a way that the direction of displacement of the mobile elements is parallel to the optical axis of the optical module.

Abstract: A lens-controlling device controls a first lens unit which moves for zooming and a second lens unit which moves for correcting the displacement of an image plane caused by zooming and for focusing. The lens-controlling device includes a memory which stores data for obtaining target-position information representing a target position to which the second lens unit is to be moved, the target position corresponding to a position to which the first lens unit is moved from a current position and a controller which generates the target-position information on the basis of the data and controls the movement of the second lens unit on the basis of position information of the first lens unit and the target-position information.

Abstract: An apparatus and method for performing offset compensation, and a computer-readable recording medium for performing the offset compensation are disclosed. The offset compensation apparatus for use in an optical zoom lens system includes: a lens unit including a zoom lens and a focus lens; a lens conveyance unit for conveying the zoom lens and the focus lens; an offset measurement unit for measuring an offset of the zoom lens and an offset of the focus lens; an offset verifier for verifying the measured offset data of the zoom lens and the focus lens; and a controller for controlling the zoom lens and the focus lens according to the verified offset data.

Abstract: Provided is a zoom lens including: a focus lens unit which moves during focusing; and a magnification-varying lens unit which moves during zooming, in which when the magnification-varying lens unit is moved in a direction in which a depth of focus deepens, a focus operation using the focus lens unit is stopped.

Abstract: A lens unit includes a lens barrel for receiving at least one lens and a motor arranged to displace the lens barrel between various positions. Displacement of the lens barrel is proportional to an electrical signal applied to the motor. A first conductor is fixed to the lens barrel and is arranged to make electrical contact with a second conductor when the lens barrel is at an initial position. A processor is arranged to detect a change in the electrical contact, to determine an electrical signal at the time of the change and to generate an electrical signal corresponding to the desired displacement.

Abstract: An interchangeable lens unit includes a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, a focus motor, and a photosensor. The zoom ring unit is arranged to mechanically transmit operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor is configured to electrically drive the focus lens unit in the Z axis direction with respect to the second lens group unit. The photosensor is configured to detect whether or not the focus lens unit is disposed at a starting point position with respect to the second lens group unit. The starting point position is disposed within the total movement range E of the focus lens unit.