摘要:
A projector for enlarging and projecting the display image on a light valve onto a screen is provided with: an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on the screen and that is provided with an infrared light emission device and ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by the electronic pen; means for measuring the distance to a screen; and means for supplying coordinate data in which the position of the electronic pen on the screen, which has been calculated based on output of the infrared photodetector, output of the ultrasonic generator, and output of the means for measuring the distance to the screen, has been normalized by the length of a side of a projected rectangular image that has been enlarged and projected.
摘要:
A transportable projector includes a focus adjustment unit for moving a focus lens in a projection lens, an acceleration sensor for detecting acceleration in a direction along an optical axis of the projection lens in the projector, a determination unit for determining whether the projector is in a stationary state or in a moving state in accordance with an output of the acceleration sensor and for respectively determining the direction to which the projector has moved and the distance that the projector has moved in accordance with an output of the acceleration sensor, and a control unit for controlling movement of the focus lens by the focus adjustment unit in accordance with the determined direction and the determined distance of the projector.
摘要:
In lamp unit 10 having light source lamp 1, reflector 2 for reflecting light from light source lamp 1, reflector holding member 11, and reflector cover 15, a plurality of cooling holes 18a are formed in a region of reflector holding member 11 provided with lamp unit positioner 16a. Cooling holes 18a are open toward an upper bulb area, a lower bulb area, and a cathode of the light source lamp, respectively. Stud 22a for fixing reflector holding member 11 has a throughhole extending at the center thereof, so that cooling air fed from high static pressure blower 27 can be sent to cooling holes 18 through tube 28 and the throughhole of stud 22a, thus efficiently cooling the upper bulb area, lower bulb area, and cathode of light source lamp 1 in a concentrative manner with a small amount of air. Thus, the resulting lamp unit, provided by the present invention, can reduce the amount of air required for cooling the lamp, and can use a high static pressure and small fan.
摘要:
An image display system is capable of controlling an image displayed by a projector using a single image signal cable connected to a personal computer. Control information is combined as images with image information that is transmitted from the personal computer through the image signal cable to the projector. The control information combined with the image information is represented by changing shapes, brightness levels, and displayed positions in a predetermined area of the displayed image. The projector's CPU reads the changing shapes, brightness levels, and displayed positions from an image memory in the projector, and instructs an image output unit to control the displayed image depending on the read data. A display unit of the projector projects the controlled image onto a projection surface.
摘要:
A projector for enlarging and projecting the display image on a light valve onto a screen is provided with: an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on the screen and that is provided with an infrared light emission device and ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by the electronic pen; means for measuring the distance to a screen; and means for supplying coordinate data in which the position of the electronic pen on the screen, which has been calculated based on output of the infrared photodetector, output of the ultrasonic generator, and output of the means for measuring the distance to the screen, has been normalized by the length of a side of a projected rectangular image that has been enlarged and projected.
摘要:
A projector (10) having a tilt angle measurement device (30) is provided with: a projection device (20) for projecting an image onto a projection surface; a tilt angle measurement device (30) for calculating the tilt angle that is formed between the axis of projection (27) of the projection device and the projection surface; and an image control unit (23) for controlling the output image from the projection device in accordance with the tilt angle that is calculated and thus correcting distortion in the image that is projected onto the projection surface. The tilt angle measurement device includes: a light guide unit (51) that is provided on the projection-side surface of the case of the projector and separated from the axis of projection in a prescribed direction; a photodetection element (52) for photodetecting, by way of the light guide unit, reflected light from at least two points that are projected onto the projection surface; and a tilt angle calculation unit (53) for calculating the tilt angle that is formed between the axis of projection of the projection device and the projection surface based on photodetection position information of the reflected light of the photodetection element.
摘要:
The projection lens shifting mechanism is provided for projecting a light beam from a light source onto a screen through a projection lens to make an enlarged projection of an image rendered on a display device. The mechanism serves for locating the projected picture at a desired position on the screen by shifting the projection lens with respect to the display surface of the display device. The mechanism includes a base plate, a moveable plate and a holding plate. The base plate is secured to the housing of the projection lens shifting mechanism and has a guide surface parallel to the display surface of the display device. The moveable plate rigidly holds the projection lens and can move in a prescribed direction parallel to the display surface of the display device guided by the guide surface of the base plate when in a moveable state. The holding plate is linked to the moveable plate through elastic members and, together with the moveable plate, constitutes an elastic clamp structure that holds the base plate on both sides and elastically clamps the base plate by means of the elastic force of the elastic members. When an external force works against the elastic force to release this clamp, the holding plate assumes a moveable state and can move integrally with the moveable plate in a direction parallel to the guide surface of the base plate.
摘要:
A reflecting portion is formed on a periphery of an opening portion 20 of an aperture element for a video projector. The reflecting portion 21 reflects a portion of the illumination light illuminating a reflecting type display element, which is other than a necessary portion, for expanding and projecting an image information by a projecting lens to an area outside an incident area of the projecting lens, such that the light portion is not incident on the projecting lens.
摘要:
In an image projection system, light emitted by a point souce (2) is reflected off the concave surface of a reflector (1) to a fly-eye-lens system (3, 4, 5, 6) where the incident light is distributed to uniformly irradiate multiple optical elements (45). Each optical element (45) splits incident light into a first, polarized component and a second, nonpolarized component parallel to the first component, and polarizes the second component identically to the first component. Light from the enhancer (5) is imagewise-modulated by an image formed in a display panel and projected onto a screen. The reflector (1) is configured so that any point on the reflector (1) is defined by an equation containing a term of parabola and at least one term of a series of aspheric coefficients of order of even number which is equal to or greater than two.
摘要:
A once-through forced air-cooled heat sink (10) according to the present invention comprises: a heat sink portion (20) which is configured to be attached to an object that is to be cooled; and a blower (30) for introducing cooling air into the heat sink portion. The heat sink portion comprises: an air inlet; an air outlet; and fins (23a,23b,23c) for dissipating heat in the object with the aid of cooling air which is supplied by the blower. The air inlet, the air outlet, and the fins are arranged such that the cooling air is introduced from the air inlet, then cools the fins and flows to the air outlet in a once-through pattern.