Abstract: A projection display apparatus includes an optical system configured to project an image, an optical path changing unit configured to change an optical path of the image to change projected positions, on a projection plane, of pixels composing the image, a driver configured to shift the optical path changing unit, and a drive controller configured to control the driver. The drive controller controls the driver with a first constant voltage in a first constant voltage section, with a second constant voltage larger than the first constant voltage in a second constant voltage section, and with a first transition voltage continuously changing from the first constant voltage to the second constant voltage in a first transition section between the first constant voltage section and the second constant voltage section. The first transition voltage is a voltage that a waveform obtained by differentiating the first transition voltage is a continuous waveform.

Abstract: The lens shifting device includes: first plate through which video light passes; second plate connected to first plate via elastic member and having projection lens attached to a position into which the video light that passed through first plate enters; slider disposed to project from second plate and housed in first plate to be movable in a predetermined direction; and guide shaft attached to first plate in the state of being engaged with slider and rotated to move the second plate. Elastic member is disposed between first plate and second plate to connect first plate and second plate in the state of generating an elastic contraction force.

Abstract: In one embodiment, a projector may include a focus adjusting unit, an adjustment image projecting unit, an imaging unit, and a condition indicating unit. The focus adjusting unit adjusts a focus of a projection light according to a manual operation. The adjustment image projecting unit projects an adjustment image containing a portion representing a predetermined pattern by the projection light. The imaging unit shoots a projection surface to which the adjustment image is projected. The specifying unit specifies a focusing condition of the focus on the projection surface by analyzing an image data that is created by the imaging unit. The condition indicating unit displays the specified focusing condition. The adjustment image includes a first portion that includes a bar graph representing the specified focusing condition, and a second portion that represents the predetermined pattern.

Abstract: A projector includes an anamorphic prism optical system for converting an aspect ratio of an irradiation region on which the video light is irradiated. The anamorphic prism optical system includes a first prism set and a second prism set. The first prism set is obtained by combining a first prism and a second prism, and the second prism set is obtained by combining a third prism and a fourth prism. The first prism, the second prism, the third prism, and the fourth prism are respectively rotatable around rotation axes thereof, and a space between the first and second prism sets is adjustable in association with the rotation of the first prism, the second prism, the third prism, and the fourth prism.

Abstract: A projection optical system substantially consists of a first optical system composed of a plurality of lens groups and a second optical system composed of one reflection mirror having a convex aspherical surface arranged in this order from the reduction side, in which all optical surfaces constituting the first and second optical systems are formed so as to have rotationally symmetrical shapes around one common axis, the projection optical system is configured such that focus adjustment is performed by individually moving two lens groups in the first optical system along the common axis, and the lens disposed on the most magnification side in the reduction side lens group of the two lens groups is a lens having a convex surface on the magnification side, thereby magnifying and projecting an image formed on a conjugate plane on the reduction side to a conjugate plane on the magnification side.

Abstract: An image projection apparatus includes: an optical image generating unit to generate an optical image based on image data; a projection surface; a projection optical system including a plurality of optical elements and configured to form an projected image, onto a projection surface, coupled with the optical image generated by the optical image generating unit; a projected image shifting unit to shift the projected image by changing a posture of at least one of the plurality of optical elements included in the projection optical system; a tilt sensor to detect a posture of the optical element of which posture is changed by the projected image shifting unit; and a trapezoidal distortion correction unit to correct the optical image generated by the optical image generating unit so as to prevent the trapezoidal distortion of the projected image from occurring based on the detection result of the tilt sensor.

Abstract: A laser projector includes a laser light source; a two-dimensional light modulator which modulates light from the laser light source; and a projection optical system which projects images onto a display plane by expanding the light modulated by the two-dimensional light modulator. Shift of a display position of the two-dimensional light modulation element and shift of the projection optical system are performed in synchronization with each other so that display positions of the images on the display plane are made substantially identical to each other. Thereby, speckle noise is sufficiently removed, and high-grade images are displayed.

Abstract: A projection optical system which, when projecting an image of an optical modulator onto a projection surface on an enlarged scale, differs the aspect ratio of the image of the optical modulator and the aspect ratio of the image projected onto the projection surface, and includes, in order from the projection surface, a first group which is an enlargement optical system; a second group includes an adjustment optical component with a surface rotationally asymmetrical to an optical axis, when defining at least one direction of the vertical direction and the horizontal direction of the optical modulator as an adjustment direction in which conversion adjustment using compression or extension is performed, the adjustment optical component having at least one optical system which differs in power between the adjustment direction and another direction; and a third group which has a correction optical component with a surface rotationally symmetrical to the optical axis.

Abstract: The light source device includes: a first support that supports one of a light source and a collimator lens condensing; a second support that supports the other of the light source and the collimator lens; and a fixing member that fixes the first support to the second support. The first support includes a first protruding portion that protrudes from the first support toward the second support, the first protruding portion having a through hole therethrough. The second support includes a second protruding portion that protrudes from the second support toward the first support, the second protruding portion having: a receiving portion that receives the first protruding portion; and a receiving hole. A rod portion of a locking member is inserted into the through hole and the receiving hole, and a head portion of a locking member is sealed with a sealant.

Abstract: A projection type display includes an optical system that includes a focus lens and is configured to project an image, a driver configured to move the focus lens along an optical axis, a phase difference sensor configured to receive light of the image that has been projected, and a controller configured to calculate a phase difference based on an output of the phase difference sensor, to calculate an in-focus position based on the phase difference that has been calculated, and to move the focus lens via the driver to the in-focus position for a focus control of the optical system, wherein the controller provides the focus control while a current position of the focus lens is located within an allowable range that is previously set in a movable range over which the focus lens can move along the optical axis.

Abstract: An optical modulation device side lens group has different powers in the longitudinal direction and the lateral direction of a liquid crystal panel. Therefore, as the entire system of the optical projection system, the optical modulation device side lens group has different magnification in the longitudinal and lateral directions. Therefore, it is possible to make the aspect ratio of an image of the liquid crystal panel different from the aspect ratio of an image projected on a screen. That is, conversion can be performed on an aspect ratio. At this time, a distance p between each focus or a diaphragm and the screen SC side end surface of the optical modulation device side lens group satisfies the conditional expressions, so it is possible to achieve a predetermined or higher telecentricity in both states, that is, a first operating state and a second operating state.

Abstract: A projector includes: alight source; a light modulation device configured to modulate light emitted from the light source according to image information; a projection lens configured to project the light modulated by the light modulation device; a holding unit that holds the projection lens; an external housing that accommodates the projection lens and the holding unit; and a clamping portion that projects from the inner surface of the external housing and clamps the projection lens or the holding unit in a direction substantially perpendicular to the optical axis of the projection lens.

Abstract: An electronic device using a lens module is disclosed. The lens module for a housing, comprises a barrel comprising a containing portion; and at least one lens insert molded mounted in the containing portion; wherein the containing portion comprises an inner sidewall, and a first latching portion in the inner sidewall; the at least one lens comprises a main body, and a second latching portion extends outward from a side surface of the main body; the second latching portion is received in the first latching portion.

Abstract: A projector includes a projector body, a mount fixed to a top of the projector body, and a projector lens assembly rotatably mounted to a top of the mount and electrically connected to the projector body. An inputting module and a processor are arranged in the projector body. A light source, a light engine, and a lens are arranged in the projector lens assembly. The inputting module receives image data and sends the image data to the processor. The processor creates instructions according to the image data. The projector lens assembly projects an image which reflects the image data, according to the instructions.

Abstract: An auto-focus device includes: a light projection lens unit that projects light emitted from a light source unit, on a projection target surface; a light receiving unit that receives a diffusely-reflected light from the projection target surface; a light receiving lens unit that guides the diffusely-reflected light to the light receiving unit; a calculating unit that calculates a focal distance to the projection target surface from the diffusely-reflected light; a first holding unit that holds the light source unit, the light projection lens unit, and the light receiving lens unit; a second holding unit that holds the light receiving unit, and is mounted on the first holding unit; and a pressing unit that presses the second holding unit against the first holding unit. The second holding unit is configured to be displaceable on a surface of the first holding unit along a groove portion formed thereon.

Abstract: An automatic focusing projecting device includes an image light source, a first image lens, an image sensor, a second image lens, a memory, a microprocessor, and at least a driving device. The image light source projects an image onto a screen through the first image lens. The image sensor senses the image on the screen through the second image lens. The microprocessor calculates sensed signals from the image sensor to get a definition of the image, and then saves the definition in the memory. The microprocessor compares the definitions when the first image lens and the second image lens are moved to different positions to move the first image lens and the second image lens and locate the first image lens and the second image lens at their focusing positions respectively where the definitions of the image are the greatest.

Abstract: A projector which projects projection light representing an image onto a projection surface, includes: a focus adjusting unit which shifts focus of the projection light according to operation by a user; an adjustment image projecting unit which projects an adjustment image containing a portion representing a predetermined pattern by the projection light; an imaging unit which shoots the projection surface to which the adjustment image is projected; a specifying unit which specifies a focusing condition of the focus on the projection surface by analyzing image data that is shot by the imaging unit; and a condition indicating unit which displays the specified focusing condition.

Abstract: A projection lens of an imaging module and the imaging module are provided. The imaging module further has a light modulator to project a first image with a first aspect ratio. The projection lens comprises an anamorphic lens set and a projection lens set. The anamorphic lens set comprises a first cylinder lens, a second cylinder lens, a bi-convex cylinder lens and a bi-concave cylinder lens, which are set after the light modulator in sequence. The first cylinder lens has at least one flat surface, and the second cylinder lens has at least one convex surface. The anamorphic lens set projects the first image with the first aspect ratio into a second image with a second aspect ratio; the second aspect ratio is different from the first aspect ratio. The projection lens set receives and projects the second image with the second aspect ratio.

Abstract: An illumination optical system includes a lens unit that is arranged on a path of an emitted light to an image forming element for forming an image; a holding unit that holds the lens unit; and an elastic body that is attached to the holding unit, and has integrally-formed first and second parts, the first part being biased in a direction of an optical axis of the light to press the lens unit, and the second part being biased in a direction perpendicular to the direction of the optical axis to press the lens unit.

Abstract: A projector includes a first serial advanced technology attachment connector, a latch, a switch, and a communication module. The first serial advanced technology attachment connector is configured to connect with a second serial advanced technology attachment connector located within a computer. The latch is configured to extend from the projector and to disconnect the first serial advanced technology attachment connector from the second serial advanced technology attachment connector. The switch is in communication with the latch, and is configured to close when the latch is extended. The communication module is in communication with the switch and with the first serial advanced technology attachment connector. The communication module is configured to provide power to a radio link, to initiate communication with the computer via the radio link, to receive an image from the computer, and to display the image.

Abstract: The image projection apparatus includes a light modulating element modulating light according to an image signal, a correcting part performing correction processing on the image signal to decrease geometric distortion in a projection image by using correction data, a memory storing first correction data corresponding to interchangeable optical units, and a controller acquiring identification information of the interchangeable optical unit attached to the apparatus, reading the first correction data corresponding to the acquired identification information from the memory, and setting the read first correction data as the correction data for the correction processing. The controller acquires, when no first correction data corresponding to the acquired identification information is stored in the memory, second correction data stored in a memory in the attached interchangeable optical unit, and sets the acquired second correction data as the correction data for the correction processing.

Abstract: A multimedia player for providing clear projection image includes; a projection unit displaying a projection image; a screen sensing unit sensing a color of a display plane on which the projection image will be displayed; and a virtual input unit for detecting and providing coordinates of a position being touched on the projection image, wherein a driving unit of the projection unit controls a focal length of a projection lens unit based on a projection image being captured by the screen sensing unit.

Abstract: A multi-resolution display system including a desktop display area, a foveal projection device, a sensor, a control unit, and a manually adjustable fixture is provided. The desktop display area displays a central image and a low-resolution image. The control unit determines six-dimensional (6D) orientation information of the foveal projection device relative to the desktop display area according to a projected image detected by the sensor, so as to control the foveal projection device to project the central image within a target area on the desktop display area. The manually adjustable fixture fixes the foveal projection device on top of the desktop display area, and the movement of the manually adjustable fixture has a freedom of up to six dimensions.

Abstract: A projector includes: an optical unit body having a light modulating apparatus configured to modulate an optical flux emitted from a light source according to image information; a projection lens configured to project the optical flux modulated by the light modulating apparatus; and an adjusting mechanism configured to adjust an inclination of the projection lens with respect to the optical unit body. The adjusting mechanism includes; a supporting portion configured to support the projection lens; a base portion configured to constitute part of the optical unit body; a clamping portion configured to clamp the base portion in cooperation with the supporting portion; a fixing member configured to fix the supporting portion to the clamping portion; and adjusting members configured to be capable of adjusting a distance between the base portion and the supporting portion.

Abstract: A lens shift mechanism includes a movable portion configured to support a projection lens and movable in two directions orthogonal to each other in a plane orthogonal to an optical axis; first and second operating units configured to generate drive forces for moving the movable portion in the two directions, respectively, first and second rotating portions to which the drive forces generated by the first and second operating units are transmitted, and a lock mechanism configured to be capable of switching between a locked state in which the two operating units are locked and an unlocked state in which the two rotating portions are rotatable, and the lock mechanism includes first and second locking members configured to lock the first and second rotating portions respectively and a lever mechanism configured to move the two locking members.

Abstract: In a line projector a diode-laser beam having an elliptical cross-section is projected onto a Powell lens which spreads the beam to form a line of light. Distribution of power along the line of light is adjusted by rotating the diode-laser beam with respect to the Powell lens.

Abstract: A driving device includes: a driving state detection unit which detects a driving state of a driving unit which drives a driving target; and a control unit which performs a first control for driving the driving unit for an amount based on the driving state of the driving unit detected by the driving state detection unit and a second control for driving the driving unit for a predetermined amount.

Abstract: A packaging product for projectors is described, wherein the package contains a projector which has been preloaded with program material for projection, and wherein a prospective purchaser of the projector may see a preview of the program material which is contained in the projector. The controls for the projector are available within an opening in the package, and a visible light reflective surface is provided to view the projected image. In this manner, the prospective purchaser will obtain an idea of the nature of the program material contained within the projector, as well as being able to determine the functionality of the projector and, to a greater or lesser extent, the quality of the projection.

Abstract: An electronic device includes a lens assembly, a lens focusing rod, a power switch and a lens protective cover. When the lens protective cover is located in the first position, the lens assembly is shielded by the lens protective cover, the power switch is turned off, and the lens protective cover is separated from the lens focusing rod. When the lens protective cover is located in the second position, the power switch is turned on, and the lens protective cover is contacted with the lens focusing rod. When the lens protective cover is moved between the second position and the third position, the power switch is turned on, and the lens assembly is driven by the lens protective cover through the lens focusing rod for focusing operation.

Abstract: An object-side lens group has different power factors between the vertical and horizontal directions of a liquid crystal panel, and a projection system as a whole therefore has different focal lengths between the vertical and horizontal directions and hence different magnification factors between the vertical and horizontal directions, whereby the aspect ratio of an image on the liquid crystal panel can be set at a value different from the aspect ratio of an image projected on a screen. That is, the projection system can convert the aspect ratio, which is the ratio of the width to the height of an image. When the distance between a diaphragm and an extreme end surface of the object-side lens group on the screen side satisfies a predetermined condition, at least a certain degree of telecentricity can be provided both in the vertical and horizontal directions.

Abstract: The image projection apparatus projects an image onto a projection surface through a projection optical system including a focus element (104) movable in an optical axis direction. The apparatus includes a shift mechanism that moves the projection optical system in a shift direction including a directional component orthogonal to the optical axis direction so as to move a position of the projected image on the projection surface, a shift position detector that detects a shift position of the projection optical system moved by the shift mechanism, a temperature detector that detects a temperature, and a controller that moves the focus element. The controller moves the focus element depending on the temperature detected by the temperature detector and on the shift position detected by the shift position detector.

Abstract: An image projecting device of the present invention includes an image display section for displaying an image, a projecting optical system for outputting the image along an optical path and projecting the image onto a projection surface, and a lens unit provided on any position on the optical path. The lens unit includes a lens section having a lens movable along at least two or more directions in a plane vertical to an optical axis of the projecting optical system, and a driving section having an actuator section for moving the lens section, and the actuator section is disposed so that a thrust line passes through a centroid of the lens section. The driving section moves the lens so as to tilt an optical axis of light emitted from the image display section, and move a display position of pixels on the projection surface composing the image displayed by the image display section.

Abstract: Described herein are devices that provide projection-type video output in a portable and flexible design. The design includes a projection chamber, a base, and an interface that permits relative positioning between the projection chamber and base. The base maintains the position of the display device. The projection chamber includes components responsible for the production of images based on received video data and components responsible for the projection of those images. Relative pointing between the projection chamber and base allows the projection chamber to be pointed—and an output projected image to be positioned—with minimal effort.

Abstract: A device for optically focusing a projection image projected by a projector includes a detector for controlled creation of at least one observation shot of the projection image over a time period, a processing unit for defining at least one image section within the projection image generated by the projector, where the image section is modulated over the time period with respect to the optical power and/or the optical spectrum thereof, and the at least one image section of the projection image is essentially synchronous compared with the corresponding respective image section of the observation shot, where the processing unit also calculates a variable derived from the comparison of the respective image sections and a control signal derived from the derived variable, and outputs the control signal to a focusing device of the projector.

Abstract: A projection display apparatus and an actuation control method thereof are provided. A projection display apparatus includes an apparatus body that forms an optical image projected on a screen, a projection lens that projects the optical image formed by the apparatus body on the screen, a lens actuator that allows the projection lens to be shifted in a vertical direction or in a horizontal direction relative to the apparatus body, and a shift controller that limits a range of shift movement by the lens actuator such that a center position of the projection lens does not go outside of a quadrangle region of which the intersection point of diagonals is located coaxially with the position of the optical axis of the apparatus body.

Abstract: A projector includes: an electro-optic device which modulates light emitted from a light source; a projection lens which projects the light modulated by the electro-optic device; and a lens shift mechanism which shifts the projection lens in a direction perpendicular to the optical axis of the projection lens, wherein the lens shift mechanism includes a shift unit which supports the projection lens and shifts the projection lens in the direction perpendicular to the optical axis, a guide unit which guides the shift of the shift unit, and a drive unit which moves the shift unit, and the drive unit includes a rotation section as a rotated part which has a first bevel gear rotating around a center axis extending in the same direction as that of the optical axis, and a transmission section which has a second bevel gear engaging with the first bevel gear and transmits the rotation of the rotation section to the shift unit.

Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.

Abstract: A projection type image display apparatus in which shortening of the projection distance (widening of the angle of view) and miniaturization of the projection optic system are realized is provided. It comprises, in a traveling direction of the light, an image display element, a lens group including a plurality of lenses, a first lens, a second lens, and a mirror to reflect light emitted from the second lens to be projected obliquely on a screen in this order. The refractive power of the first lens is positive and the refractive power of the second lens is negative. The first and the second lenses are moved in an interlocked relationship with each other along an optical axis of the lens group and a movement amount of the first lens is made larger than a movement amount of the second lens.

Abstract: There is provided a projector that uses a laser light source and is safe and realizes high brightness. The projector applies a laser beam emitted from a laser light source (101) to an image modulation device (105) and magnifies and projects an image formed in the image modulation device (105) by a zoom lens (106). The projector includes a control mechanism (108) for controlling the amount of energy of the light beam in response to a change in a focal distance of the zoom lens (106) in such a way that an energy density of the laser beam developed on a light emitting surface of the zoom lens (106) is kept at a specified value or smaller than the specified value. The specified value is the energy density of the laser beam in a case where the focal distance of the zoom lens (106) is set to the shortest value and is an accessible emission limit value (AEL value) that satisfies the laser safety class of the projector.

Abstract: A moving mechanism includes a support, a moving body arranged movably in a predetermined direction relative to the support, a first groove provided in the support parallel to the moving direction, a second groove provided in the moving body parallel to the moving direction, and facing the first groove, and a vibrating body arranged in the support or moving body and biased to press the other of the moving body or the support. A direction which the first groove and the second groove face each other intersects a direction which the support and the moving body face each other, and a biasing direction which the vibrating body is biased intersects the direction which the first groove and the second groove face each other and the direction which the support and the moving body face each other. Accordingly, backlash of the moving body with respect to the support is suppressed.

Abstract: A projection device including a case, a zoom lens module, a focus lever, and a linkage mechanism is provided. The case defines a guiding slot. The zoom lens module is disposed in the case and is configured for projecting an image. The focus lever is disposed in the case and is connected to the zoom lens module. The focus lever is perpendicular to a lengthening direction of a center axis of the zoom lens module. The linkage mechanism includes an adjusting rod having a connecting portion and an operating portion. The connecting portion is connected to the focus lever and is configured for rotating relative to the focus lever and moving along the lengthening direction of the focus lever. The operating portion extends out of the case and is configured for being controlled to move relative to the case along a lengthening direction of the guiding slot.

Abstract: A bidirectional projector, which may project slides onto two screens at the same time, includes a light source emitting red beam, green beam, and blue beam; at least an imaging device receiving the red beam, the green beam, and the blue beam from the light source and reflecting predetermined parts of the red beam, the green beam, and the blue beam to form an image beam according to image signals; and an optical lens, wherein the image beam emits to the optical lens and a part of the image beam passes through the optical lens to form a first projecting beam, and a part of the image beam is reflected by the optical lens to form a second projecting beam.

Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

Abstract: A projection system including a projection screen and a projection apparatus is provided. The projection screen has a plurality of optical microstructures. The optical microstructures are arranged along a first direction. The projection apparatus is capable of moving relative to the projection screen along the first direction. The projection apparatus includes an illumination unit, a light valve, and a projection lens. The illumination unit is capable of providing an illuminating beam. The light valve is disposed on a transmission path of the illuminating beam. The light valve is capable of converting the illuminating beam to an image beam. The projection lens is disposed on a transmission path of the image beam. The projection lens is capable of moving relative to the light valve along a second direction and projecting the image beam on the projection screen. The first direction and the second direction are opposite directions.

Abstract: An image projecting apparatus includes an image display element, an optical system that projects an image displayed on the image display element onto a screen, an optical element that shifts in a direction perpendicular to an optical axis of the optical system, an adjusting mechanism that can shift the optical element in the direction perpendicular to the optical axis, and a holding member that fixes the optical element to a lens barrel, wherein a combined Abbe number vdch of materials of the optical element with respect to a d-line, a combined focal length fdch of the optical element with respect to the d-line, and the pixel pitch P of the image display element satisfy an appropriate condition.

Abstract: A portable image projection device has a housing with first and second members pivotable between device folded and unfolded positions. First lens optics mounted within the first member are configured for projecting light modulated by a spatial light modulator along an optical axis through a first aperture with a first throw ratio with the device in the folded position. A second lens optics element movably mounted within the first member is configured for selective movement between positions of non-intersection and intersection with the optical axis. The second lens optics element is configured for cooperating with at least part of the first lens optics for projecting the light modulated by the spatial light modulator along the optical axis through a second aperture with a second throw ratio less than the first throw ratio with the device in the unfolded position.

Abstract: A projector includes: an electro-optic device which modulates light emitted from a light source; a projection lens which projects the light modulated by the electro-optic device; and a lens shift mechanism which shifts the projection lens in a direction perpendicular to the optical axis of the projection lens, wherein the lens shift mechanism includes a shift unit which supports the projection lens and shifts the projection lens in the direction perpendicular to the optical axis, a guide unit which guides the shift of the shift unit, and a drive unit which moves the shift unit, and the drive unit includes a rotation section as a rotated part which has a first bevel gear rotating around a center axis extending in the same direction as that of the optical axis, and a transmission section which has a second bevel gear engaging with the first bevel gear and transmits the rotation of the rotation section to the shift unit.

Abstract: An image projection apparatus 500 includes an optical modulation element 206R, 206G, 206B, a projection lens 100 configured to project light modulated by the optical modulation element onto a projection surface, an optical unit 201 configured to guide light from a light source 209 to the optical modulation element and to guide the light from the optical modulation element to the projection lens, a shutter mechanism 300 disposed between the optical unit and the projection lens and configured to operate so as to be in an open state and a closed state, and a focus corrector 501 configured to correct a focus variation generated by temperature changes of the optical unit and the projection lens by operating the projection lens based on a focus correction function. The focus corrector changes the focus correction function in accordance with information relating to an operation of the shutter mechanism.

Abstract: A projector includes: a lens position control unit which controls a projection position of an image by shifting a projection lens; a signal receiving unit which receives a position control start signal to start position control and a lens shift signal from a remote controller; a direction conversion memory unit which stores direction conversion information corresponding to the lens shift signal as information for performing a predetermined conversion of the shift direction of the projection lens; a shift direction converting unit which converts the shift direction of the projection lens based on the direction conversion information; a menu display unit which displays a direction conversion menu screen through which the direction conversion information is inputted; and a control unit which allows the menu display unit to display the direction conversion menu screen when a predetermined condition is satisfied at the time of reception of the position control start signal.

Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.