Abstract: In a method of generating an enlarged image signal by the use of a field memory, an image signal enlargement processing cycle constituted by n-th to (n+5)-th fields is repeated so that each one field of image signals read in the order of the n-th to (n+5)-th is sequentially processed by a signal processing circuit into video image signals. The signals are supplied by interlaced scanning to a video image reproducer such as an external television or video projector so that an image is displayed on a display screen in the order of an odd-line field and an even-line field. An area to be enlarged is sequentially written into an odd-line block and an even-line block of a field memory and can continuously be moved on the basis of a designation signal from a microcomputer, so that an enlarged image can be scrolled on the display screen.

Abstract: An overhead projector of the under mirror type includes a projection head assembly supported on a column so as to be located over a stage on the top of a housing and so as to be pivotable between a standing position and a stowed position. A projection lens is fixed on a lens frame and a reflecting mirror is fixed on a mirror plate. Both the lens frame and the mirror plate are rotatably mounted on a single shaft further mounted on the head body of the projection head assembly so that angles of the lens and the mirror are increased and decreased. The lens frame is rotated by a self-weight of the lens in such a direction that the angle of the lens is decreased, when the projection head assembly assumes the standing position. A link lever interconnects the lens frame and the mirror plate so that the angles of them are adjusted so that the angle of the lens doubles that of the mirror. A mirror locking element locks the mirror at a position where the angle of the mirror is maximum.

Abstract: A material exhibiting apparatus displays an image of a material and a character such as an arrow on a display screen in an overlapped state. A location of a display area is set in synchronization with horizontal and vertical synchronizing signals. The set location of the display area is changed by varying a generation timing of either one or both of the horizontal and vertical synchronizing signals. A display location of the character is changed by changing the set location of the display area. Since the display location of the character is quickly changed on the basis of frequencies of the horizontal and vertical synchronizing signals, the movement of the character can continuously be displayed on the display screen.

Abstract: An image input equipment including a stage having a diffusion board provided on an upper surface thereof on which an object is to be placed, an image input head for inputting an image of the object and photoelectrically converting the image into an electric signal, a supporting pillar for supporting the image input head and positioning the image input head over the stage, exterior illumination lamps for illuminating the object placed on the stage from above the stage, interior illumination lamps for illuminating the object placed on the diffusion board from inside the diffusion board. The image input equipment is further provided with lighting circuits and a changeover device. The lighting circuits are used to activate both the exterior illumination lamps and the interior illumination lamps. The changeover device connects the lighting circuits to only either the exterior illumination lamps or the interior illumination lamps selectively.

Abstract: An overhead projector includes a housing including a stage which is formed in its top wall and on which a transparency bearing an image to be projected is placed and an air outlet formed in one of its two side walls, an exhaust fan incorporated in the housing for exhausting air in the housing through the air outlet of the housing, a projection light source such as a high illuminance halogen lamp disposed in the housing for illuminating the transparency on the stage from inside the housing, a projection head mounted for projecting a magnified image from the transparency on a screen and including a focusing lens and a reflecting mirror, a column mounted on the housing to hold the projection head over the stage, a Fresnel lens disposed inside the stage to converge light from the light source on the focusing lens of the projection head, a cooling fan, and air guides for guiding air delivered from the cooling fan so that the air flows along a surface of the stage.

Abstract: An image input equipment comprises an image input head having an image pickup element and an image input lens built therein, a stage on which an object is to be placed, a supporting pillar for supporting the image input head and positioning the image input head over the stage, said image pickup element for photoelectrically converting an image of the object to an electric signals, said image input lens for forming the image of the object on the image pickup element. The image input head is assembled pivotally on the supporting pillar to pick up the image of the object placed in front of and in rear of the stage as well as the image of the object placed on the stage. The image pickup element can be turned through an angle of at least 180.degree. on an optical axis of the image input lens integral with the image input lens.

Abstract: To set a distance between a lens mounting surface of a lens mount and a image pickup element for a back-focus of a interchangeable lens, the video camera comprises two guide pins fixed inside a front panel of a camera body parallel to an optical axis of a lens, said front panel which the lens mount is fixed in, a carrier supported by the two guide pins to move parallel to the optical axis, said carrier to which the image pickup element is fixed, a spring provided between the carrier and the front panel of the camera body to bias the carrier in such a direction that the carrier separates from the lens mount, a screw shaft rotatably assembled on the camera body by a holder to move parallel to the optical axis of the lens, said screw shaft having one end connected with the carrier and the other end on which an adjusting ring is screwed, and an opening formed in the camera body.

Abstract: A portable image input equipment for sending a video signal of an object to a monitor television comprising a document stage on which an object is to be put, a U-shaped support member which consists of a pair of arms and a base frame with the arms and the base frame defining a generally rectangular shape and the U-shaped support member is pivotally mounted on the document stage so as to be movable between a folding position where the U-shaped support member is folded down to the document stage and a standing position where the U-shaped support member is raised from the document stage, a camera head pivotally mounted on the arms so as to be movable between a folding position where the camera head is folded down into the space to be flush with the support member and a standing position where the camera head is raised from the space, an illuminator pivotally mounted on the U-shaped support member so as to be movable between a folding position where the illuminator is folded down into the space to be flush with t