Abstract: Aspects of the present disclosure are directed to, for example, a method for measuring distance in order to focus at least one camera lens of a camera. In one example embodiment of the method, a wide-distance measuring system is used to measure the distance of an object and provide at least one wide measurement value, the wide-distance measuring system includes at least one microwave measuring system, and is further used to focus the camera lens, and at least one further measurement value is provided using at least one further measuring system.

Abstract: Systems and methods are disclosed for replaceable outer lenses. For example, an image capture device may include a lens barrel in a body of the image capture device, the lens barrel including multiple inner lenses; a replaceable lens structure that is mountable on the body of the image capture device, the replaceable lens structure including an outer lens and a retaining ring configured to fasten the outer lens in a position covering a first end the lens barrel in a first arrangement and configured to disconnect the outer lens from the body of the image capture device in a second arrangement; and an image sensor mounted within the body at a second end of the lens barrel, the image sensor configured to capture images based on light incident on the image sensor through the outer lens and the multiple inner lenses when the retaining ring is in the first arrangement.

Abstract: A multi-purpose component system for photography is described. The system includes motors having connection channels arranged to engage with T-shaped engagement portions located on photographic equipment components. Cam members located along the engagement portions act to fix the motors in position relative to the components.

Abstract: A focusing method includes determining an initial search direction based on a present position of a lens. The focusing method also includes controlling the lens to perform a focusing process in the initial search direction.

Abstract: According to one embodiment, an ultrasound diagnosis apparatus transmits ultrasound waves to a subject from a plurality of transducers each corresponding to one of a plurality of channels, and receives reflected waves generated in the subject by the transducers. The ultrasound diagnosis apparatus includes a control circuit and a receiving circuit. The control circuit controls channels used to transmit ultrasound waves and channels not used to transmit ultrasound waves among the channels. The receiving circuit receives the reflected waves, and includes a preamplifier and an impedance control circuit. The preamplifier amplifies the reflected waves. The impedance control circuit is located on the upstream side of the preamplifier, and sets line impedance in a transmitting period, in which the ultrasound waves are transmitted from the transducers to the inside of the subject, to be lower than that in a receiving period, in which the reflected waves are received by the transducers.

Abstract: The invention concerns an image-inverting system for a sighting telescope, where the image-inverting system has at least two mutually displaceable lenses in a tube of the image-inverting system parallel to an optical axis of the image-inverting system, where displacement of the at least two displaceable lenses modifies the reproduction scale at which an image projected onto a first image plane of the image-inverting system is shown on a second image plane of the image-inverting system, where the at least two displaceable lenses are arranged in any position between the first and the second image plane, where a surface of the inside of a tube facing the optical axis having at least one absorption area with absorption zones for absorbing incident light and with sliding surfaces located between neighboring absorption zones for bearings of the at least two displaceable lenses, where the total area of the sliding surfaces is smaller than the total area of the absorption zones, where the at least one sliding surface

Abstract: A scanner includes a camera, a light source for generating a probe light incorporating a spatial pattern, an optical system for transmitting the probe light towards the object and for transmitting at least a part of the light returned from the object to the camera, a focus element within the optical system for varying a position of a focus plane of the spatial pattern on the object, unit for obtaining at least one image from said array of sensor elements, unit for evaluating a correlation measure at each focus plane position between at least one image pixel and a weight function, a processor for determining the in-focus position(s) of each of a plurality of image pixels for a range of focus plane positions, or each of a plurality of groups of image pixels for a range of focus plane positions, and transforming in-focus data into 3D real world coordinates.

Abstract: Head mountable camera devices, systems, and methods are disclosed.

Abstract: Provided is a lens apparatus, including: a lens barrel comprising an operation ring rotatable about an optical axis of an optical system to operate a movable optical member included in the optical system; and a driving apparatus engaging with the operation ring to drive the operation ring in a mounted state on the lens barrel, wherein the driving apparatus includes a first communication unit and an operation unit; the lens barrel includes a second communication unit; communication between the lens barrel and driving apparatus is established through the first and second communication units; in the mounted state, the first communication unit is disposed on a surface covering a part of an outer peripheral surface of the lens barrel; and is located on a object side relative to an operation unit arranged closest to an image side in an optical axis direction of the optical system on the driving apparatus.

Abstract: A device for adjusting a camera lens, which includes at least one lens ring rotatable about the optical axis of the camera lens for zoom, focus or aperture adjustment, which is connectable with a driving device actuatable by an electronic control unit, includes a retaining device connected with the camera lens, which is adapted to the contour of the camera lens, for accommodating a fastening mechanism of a drive system containing the driving device and the electronic control unit.

Abstract: Apparatuses, methods and storage medium associated with multi-camera devices are disclosed herein. In embodiments, a multi-camera device may include 3 or more camera sensors disposed on a world facing side of the multi-camera device. Further, the multi-camera device may be configured to provide a soft shutter button at a location on an opposite side to the world facing side, coordinated with locations of the 3 or more camera sensors that reduces likelihood of blocking of one or more of the 3 or more camera sensors. Other embodiments may be disclosed or claimed.

Abstract: The image pickup apparatus has a focus lens that adjusts focus on a subject, an operating section (an MF operation ring) that accepts user's operation, and a focus-lens driver that drives the focus lens in response to the user's operation. The focus-lens driver drives the focus lens so that a rotation amount at the operating section, which is required for moving a focus position by unit distance, is maintained at a constant level with no regard to a subject distance.

Abstract: The invention relates to a method and to an arrangement for operating a dynamic nano focusing system for use thereof in the field of microscopy, interferometry or similar applications, wherein the nano focusing system comprises a lever-transmission piezo actuator and a frictionless guide based on a resiliently deformable solid body joint which is connected to a mounting unit, in particular for a lens, in order to implement the desired adjustment paths for the focusing. According to the invention, in order to increase the dynamics during the focusing process, a secondary fine adjustment movement is superimposed on the primary adjustment movement, said secondary fine adjustment movement having a smaller adjustment path but higher frequency than the primary adjustment movement, wherein, when the fine adjustment is carried out, a determination is made as to whether the focusing result changes, in order to specify according thereto the amount and/or the direction of the primary adjustment movement.

Abstract: A method for determining an output signal is provided. A radio device identifier associated with a second radio device is stored in a first radio device. One or more configuration parameter settings associated with the second radio device are stored in the first radio device. The first radio device identifies the second radio device based on the radio device identifier. In response to identifying the second radio device, the first radio device automatically determines the configuration parameter settings should be used to determine an output signal based on a user input. The first radio device establishes a radio communications link with the second radio device. The first radio device receives the user input. Based on the configuration parameter settings and the user input, the first radio device determines the output signal. The first radio device transmits the output signal to the second radio device through the radio communications link.

Abstract: A telescope made up of mutually connectable modules, which telescope comprises at least a lens module and an eyepiece module, and the lens module and eyepiece module each have a connection interface for connecting the modules, wherein an optical system for changing the image magnification is integrated in the lens module.

Abstract: Position determination method for a target point, using a geodetic measuring device, such as a total station or a theodolite, having a distance and angle measurement functionality, a sighting device, and a first radio module, and using a hand-held data processing device, such as a data logger for the measuring device, having a second radio module. The data processing device is positioned within a specified radius of the target point. As part of the method, a radio connection is established between the first and the second radio modules, and the position of the target point is determined. A rough distance between the first and the second radio modules is determined based on a propagation time of interrogation and/or response signals of the radio connection and is used to locate the target—as displaying, detecting, identifying, and/or sighting the target point—or to exclude further possible target point candidates.

Abstract: A method of determining a focal distance between a principal camera and a target object utilizes first and second video cameras mounted in spaced apart positions relative to a principal camera. A first video image from the first video camera is displayed on a video monitor and a second video image from the second video signal is superimposed onto the first image. First and second controllers are provided for positioning the first and second video images, respectively, on the video monitor. First and second position signals corresponding to positioning of the first and second video images, respectively, are acquired. When the images of a target object in the two video images are aligned, the position signals are used to compute the focal distance from the principal camera to the object.

Abstract: A method for adjusting the picture definition on the camera lens of a motion picture camera. A drive unit is connected to the camera lens which is driven, in the manual focusing operation, by an picture definition handwheel of an operating unit, which displays the adjusted picture definition on a scale dial, and, in the automatic focusing operation, by an auto-focusing device for measuring the distance from an object to be recorded by the motion picture camera and outputting control signals to an electromechanical actuator, which is connected to the picture definition handwheel or to the scale dial of the operating unit, for adjusting or readjusting the picture definition adjusted on the picture definition handwheel or displayed on the scale dial as a function of the distance measured from the object to be recorded.

Abstract: An optical position of a display device with respect to an optical axis of a projection optical system is displaced in a direction perpendicular to the optical axis in accordance with a change in the size of a projected image. For instance, a transparent flat plate is disposed in front of a projection lens, and the transparent flat plate is tilted in association with a rotation of a zoom adjustment ring. As the transparent flat plate is tilted, the apparent position of the display device relative to the projection lens is displaced in the direction perpendicular to the optical axis of the projection optical system. Thereby, the projected image on a screen is located at a proper position corresponding to a zoom state. Tilt control of the transparent flat plate is realized by a cam mechanism, for instance.

Abstract: This installation includes: a light source; means for storing film photoresist for exposure and exposed photoresist; a film carrier for positioning said film photoresist at an exposure plane; a projection lens capable of projecting the digital images at the exposure plane; a liquid crystal matrix where the various digital images to be exposed are displayed; a retractable mirror oriented at 45° to an optical axis of the projection lens; and an image analysis device positioned symmetrically to said exposure plane with regard to the plane containing said mirror when the latter is in place on the optical axis. When said mirror is positioned on the optical axis, the image analysis device is suitable for receiving the image transmitted by the liquid crystal matrix issuing from the projection lens. The signals thereby detected are processed using an associated software, for setting the characteristics of the optical members of the installation.

Abstract: There are provided a focus adjusting apparatus and method in which judgment of an object area to be focused can be favorably performed when the judgment of the object area to be focused is executed at the time of image-taking preparation operation. In the focus adjusting apparatus and method, a first operation of determining the object area to be focused is performed prior to the image-taking preparation operation, and a second operation different from the first operation is performed to execute a focusing operation at the time of the image-taking preparation operation. Prior to the first operation, whether or not an object to be focused can be predicted is judged to change a manner of the first operation based on a result of a judgment.

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: This installation includes: a light source ; means for storing film photoresist for exposure and exposed photoresist; a film carrier for positioning said film photoresist at an exposure plane; a projection lens capable of projecting the digital images at the exposure plane; a liquid crystal matrix where the various digital images to be exposed are displayed; a retractable mirror oriented at 45° to an optical axis of the projection lens; and an image analysis device positioned symmetrically to said exposure plane with regard to the plane containing said mirror when the latter is in place on the optical axis. When said mirror is positioned on the optical axis, the image analysis device is suitable for receiving the image transmitted by the liquid crystal matrix issuing from the projection lens. The signals thereby detected are processed using an associated software, for setting the characteristics of the optical members of the installation.

Abstract: A method for adjusting the picture definition on the camera lens of a motion picture camera. A drive unit is connected to the camera lens which is driven, in the manual focusing operation, by an picture definition handwheel of an operating unit, which displays the adjusted picture definition on a scale dial, and, in the automatic focusing operation, by an auto-focusing device for measuring the distance from an object to be recorded by the motion picture camera and outputting control signals to an electromechanical actuator, which is connected to the picture definition handwheel or to the scale dial of the operating unit, for adjusting or readjusting the picture definition adjusted on the picture definition handwheel or displayed on the scale dial as a function of the distance measured from the object to be recorded.

Abstract: An image projection apparatus is disclosed with which problems, caused by performing focusing control in a state in which the light amount of a light source is insufficient, can be avoided. The image projection apparatus comprises a controller, performing focusing control of a projection optical system, and a brightness detector which detects at least one of a brightness of the light source and a brightness of a reflected light on a projection surface. After turning the light source on, the controller restricts the focusing control until the brightness detected by the brightness detector reaches a predetermined value.

Abstract: An image projection apparatus is disclosed with which problems, caused by performing focusing control in a state in which the light amount of a light source is insufficient, can be avoided. The image projection apparatus comprises a controller, performing focusing control of a projection optical system, and a brightness detector which detects at least one of a brightness of the light source and a brightness of a reflected light on a projection surface. After turning the light source on, the controller restricts the focusing control until the brightness detected by the brightness detector reaches a predetermined value.

Abstract: A projection apparatus comprising a projection section for projecting an image corresponding to an input image signal, a distance measuring section for measuring each distance of several positions on an image projection plane made by the projection section, a focus control section for making keystone correction on an image projected by the projection section so that a projection image is formed into a rectangular shape having a proper aspect ratio based on each distance obtained by the distance measuring section while controlling a focus position of the image projected by the projection section, and a control section for instructing to carry out processing by the focus control section.

Abstract: The lens information display apparatus is provided that allows the cameraman to check required lens information while looking at a viewfinder. A transmissive LCD panel is mounted in front of a screen of the viewfinder, and a control unit for controlling the image displayed on the LCD panel is attached to the bottom surface of the viewfinder. The control unit obtains lens information from a lens apparatus of a television camera system and causes the LCD panel to display images (characters and/or graphics) representing the lens information so that the lens information is displayed as superimposed on the image on the viewfinder.

Abstract: An automatic lens focusing system according to the present invention includes an adjustable focus lens having a driver for focusing the lens on a photographic subject, a lens position detecting device to detect a focus position of the lens, a distance detecting device to detect a subject distance from the lens and generate a range signal representation of the range to the photographic subject, automatic actuating device responsive to the range signal for activating the driver to adjust the position of the lens to focus on the photographic subject, an indicating device responsive to the range signal for activating a first indicator indicative of the focal point of the subject and responsive to the lens setting for activating a second indicator indicative of the range setting of the lens, a manual actuator responsive to a manual input to for activating the driver to focus the lens, and a switching device to switch between the automatic mode and the manual mode.

Abstract: An image projector includes a film assembly, motor, light source and lens. The film assembly includes a periscope having a first aperture, the film assembly being configured so as to mount a film to scroll in front of the first aperture of the periscope. The motor scrolls the film in front of the first aperture. The light source projects light through the periscope and portions of the film positioned in front of the first aperture of the periscope. The lens focuses the light projected through the film and the periscope.

Abstract: A projector that can be easily set up and adjusted is disclosed. In accordance with a projection condition inputted into a microcomputer via a remote-controller, the microcomputer selects an optimum projection lens by referring to correlation data showing a relation among a projection lens, a projection display size, and an optimum projection distance. The microcomputer has a screen to indicate an optimum projection lens and projection distance that satisfy the inputted projection condition. The microcomputer calculates the amounts of zoom and focus adjustments to be made to the projection lens with reference to the correlation data so as to attain the projection display size and the microcomputer automatically drives the projection lens via a zoom driving unit and a focus driving unit.

Abstract: A system corrects differential focus arising from keystone errors in projection displays. An electrically variable optical element may correct the differential focus of the projected image. The focus of the image may be corrected so that opposed portions of the image, otherwise subject to keystone errors, are both correctly focused.

Abstract: A device for focusing a film picture in a movie film camera with a camera housing which has a lens carrier 5 for holding a camera lens, with a camera end which forms a lens plane, and a film window where a film is moved along in an image plane by means of a film transport device. A device for changing the distance between the lens plane and the image plane is provided.

Abstract: A focus indicator system for a motion picture camera has video cameras mounted on opposite sides of the motion picture camera. Images produced by the video cameras are superimposed on the screen of a monitor. The video cameras are rotatable, and rotate in responses to changes in the focus of the lens. Movements of the lens' focus ring are detected by a transducer. A control circuit monitors the output from the transducer and operates a motor, which rotates the video cameras in opposite senses. The optical axes of the video cameras cross in the plane in which the lens is focused. The person operating as first assistant camera can determine when the motion picture camera is in focus by viewing the monitor. When an object is in focus, the superimposed images from the video cameras coincide. When the object is not in focus the superimposed images are separated. The focus indicator helps the person who is focussing the camera to rapidly and accurately focus on objects in the camera's field of view.

Abstract: Two cam pins of the variable magnification lens group and the aberration correction lens group are guided by two side walls of one cam groove. Thus, two cam grooves can deal with three movable lens groups, and there is no need to provide three cam grooves. Consequently, the cam cylinder can be short, and thereby the zoom lens apparatus can be compact. A spring applies force to the two cam pins to separate from one another, so that the cam pins can be pressed against the side walls.

Abstract: A sliding coupling mounted between a pair of separately rotational members, including a pair of coiled springs, which realizes no rotational delay at time of reversing a rotational direction of one of the rotational members. Each coiled spring has a projecting part extending radially outwardly from one end thereof. The pair of coiled springs are fictionally mounted on an outer surface of one of the rotational members with the circular parts and the projecting parts of the coiled springs being overlapped with each other so that the winding directions of the coiled springs are opposite to each other. The other rotational member has an engaging groove with which the projecting parts of the coiled springs are engaged without a space between each projecting part and a surface forming the engaging groove of the rotational member in each rotational direction.

Abstract: An adjustable rack focus stop on a focusing lens incorporates an arm mounted to the focusing lens housing and extending over the focus ring. A stop in the form of an adjustable band is positioned on the focus ring and includes a catch which is capable of engaging the arm. Two objects at different distances from the lens may be focused on through the focusing of the lens on the second object, adjustment of the stop so that it contacts the arm and then readjusting the focus to the first object. The two objects may be filmed in sequence without turning off the camera by adjusting the focus to engage the catch with the arm when refocusing to the second object.

Abstract: An optical apparatus including an optical assembly having an image formation optical system and a device for receiving an image, said optical assembly including optical components disposed along an optical axis for projecting the image to a display surface, a detecting device for detecting each distance to a plurality of predetermined locations which are set apart from each other and for producing detection signals representing a non-orthogonal relationship between the display surface and the optical axis, and a controlling device for biasing at least one of the components included in the optical assembly in response to the detection signals thus obtained. Then, a part of such an optical assembly is driven in a direction perpendicular to the optical axis, thus making it possible to implement an optical apparatus capable of obtaining a projected image which is in focus all over the screen without distortion.

Abstract: An apparatus comprises an image sensing optical system including an image pickup element for converting an image to an electrical signal and a projection lens for projecting an image onto a photo-sensing plane of the image pickup element. The image sensing optical system is driven along an optical axis thereof while maintaining a relative positional relationship between the projection lens and the image pickup element to adjust the focal position. An apparatus may also comprise an image sensing optical system including an image pickup element for scanning an image to convert it to an electrical signal and a projection lens for projecting an image onto a photo-sensing plane of the image pickup element, a focus adjusting device for adjusting a focal position of the image sensing optical system and a detector for detecting an in-focus position of the image sensing optical system to the object.

Abstract: A focus detection apparatus of this invention can select one of a plurality of distance measurement areas in a photographing area, and obtains an in-focus point on the basis of contrast data of an object in the selected distance measurement area, thereby driving a photographing lens. When the selected distance measurement area is set by an area setting unit, an MTF characteristic value corresponding to the selected distance measurement area stored in a ROM is read out. An MPU obtains a contrast peak value of a first detection frequency component, and detects a position of a first peak value. The MPU predicts an existing area of a contrast peak value of a second detection frequency component higher than the first detection frequency component on the basis of the detected first peak value position and the MTF characteristic value read out from the ROM.

Abstract: A zoom lens drive mechanism, for translationally driving and positionally locating a lens subgroup of a zoom lens to a zooming position along an optical axis of the zoom lens, comprises a base ring member having an aperture concentrically defined about the optical axis of the zoom lens and a drive ring member rotatably mounted on the base member for concentric rotation about the optical axis with axial constraint. A translatable lens subgroup ring member is suspended concentrically from the base and drive ring members by means of rods independently coupled at first ends thereof to the base and drive ring members and joined at second ends thereof to a common pivot point on the translatable ring member. Alternative split ball joint arrangements are described for coupling the suspension rods to the translatable ring member.

Abstract: The device permits swing, shift, tilt and rise-and-fall movements between a lens and a motion-picture camera to manipulate focal relations and image shapes. Preferably the device rests on rails (called "iris rods") of a balance plate or base--secured under the camera--or some other track, similarly mounted. If so, the device has a first intermediary element preferably mounted to slide fore-and-aft on the track relative to the camera; and other intermediary elements mounted in a sequence preferably from the first element for translation and rotation relative to that element--ending in a lens-board mount for mounting a lens. Also in balance-plate mounting the device preferably includes a bellows whose front end joins the lens-board mount and whose rear end holds an adapter to engage the camera lens port. Preferably the device has a yoke (preferably flat and rearward-extending) for, e.g.

Abstract: A video projection system having a liquid crystal panel with a video image, a projection lamp with ON/OFF control, a zoom lens with a zoom control mechanism, a focusing lens with a focusing control mechanism, an audio system with a volume control, a projection-lamp light detector, a heat sensor, a variable-speed cooling fan, a control module having a microprocessor and a digital-to-analog converter, a display, a keypad, an alarm/annunciator, a power supply with ON/OFF control, and an infrared based remote control system able to control power ON/OFF, zoom, focus, picture, and sound volume.

Abstract: The present invention relates to a method and apparatus for carrying out the focusing of projected images. To carry out such focusing, an image sensor operates on a small section of the projected image to blow it up to a point where only the grains of the image become larger than the resolution of the sensor. The image set obtained is electronically scanned so that a signal is received which includes a low frequency band determined by the grain density and a harmonic span generated by the transitions between grains and interstices, whereby a differential voltage is created which is indicative of the state of focusing.

Abstract: An automatic focusing system has an automatic parallax correction for use with a camera, which is either a motion picture camera or a video camera. The camera includes a variable focus lens and an adjusting mechanism of a lens focus barrel which adjusts the variable focus lens so that an image of a photographic subject is in focus on a focal plane. A pan/tilt head is mounted on a tripod. The automatic focusing system includes a plate, a motorized turntable, a housing and a range finder. The plate is mounted on the pan/tilt head. The camera is mounted on the plate. The motorized turntable is also mounted on the plate. The motorized turntable is servo controlled. The motorized turntable is disposed a fixed and known first distance from the camera and is made to rotate along an axis parallel to the pan-axis of the pan/tilt head. The housing is mounted on the motorized turntable. The range finder is disposed in and mechanically coupled to the housing.

Abstract: A motion picture camera is used with an automatic focusing system. The motion picture camera is mounted on a first tripod and includes a variable focus lens and an adjusting mechanism for adjusting the variable focus lens so that an image of a photographic subject is in focus on the focal plane. The automatic focusing system includes a housing, a range-finding subsystem, an angle-encoding subsystem, a processing subsystem and a driving assembly which is mechanically coupled to the adjusting mechanism. The housing is mounted on a second tripod and is disposed apart from the motion picture camera a first distance and from the photographic subject a second distance. The range-finding subsystem and the angle-encoding subsystem are disposed within and mechanically coupled to the housing.

Abstract: Device for connecting two components of a motion-picture camera. A thermal expansion compensation pendulum (Rost pendulum) (3) is disposed between the two components (10, 11), said pendulum being composed of a first element (31) connected with one component (11), a second element (32) connected with the component (10), and at least one intermediate element having axial and/or radial play between both elements (31, 32) and being connected therewith. The coefficient of thermal expansion of the intermediate element or elements (33) is a multiple of the coefficients of thermal expansion of the first and second elements.

Abstract: A microfilm image reader apparatus for detecting an image on a microfilm strip and projecting the detected image onto a target plane, wherein a beam of light bearing an image detected from the microfilm strip is produced by illuminating the microfilm strip and is projected through a projection lens onto the target plane, and wherein an automatic mode of focus control is established through detection of a condition in which the image-bearing beam is focussed with respect to the target plane and, when it is detected that the automatic mode of focus control is inoperable, the projection lens is automatically moved to a position having its focal plane located on a predetermined plane with respect to the target plane and, after the projection lens is moved to such a position, the focal plane of the projection lens may be manually adjusted by the operator of the apparatus.

Abstract: A magnified image projector apparatus such as a microfilm strip reader or a microfilm strip printer apparatus having an automatic focus control system and a tiltable reflector mirror by means of which the image-carrying beam passed through an image projection lens may be directed to advance along one path of light toward the viewing screen to along another path of light to a photodetector unit of the focus control system which comprises a focusing lens located in the path of light between the tiltable reflector mirror and the photodetector unit so that the image-carrying beam passed through the projection lens may be incident on the photodetector unit to a reduced scale. This arrangement of the focussing lens allows significant reduction in the effective light receiving area of the photodetector unit used in the apparatus while enabling the photodetector unit to accurately detect the location at which the beam is focussed by the projection lens.

Abstract: A video projection system having a liquid crystal panel with a video image, a projection lamp with ON/OFF control, a zoom lens with a zoom control mechanism, a focusing lens with a focusing control mechanism, an audio system with a volume control, a projection-lamp light detector, a heat sensor, a variable-speed cooling fan, a control module having a microprocessor and a digital-to-analog converter, a display, a keypad, an alarm/annunciator, a power supply with ON/OFF control, and an infrared based remote control system able to control power ON/OFF, zoom, focus, picture, and sound volume.