摘要:
In an image calibration device 10, a calibration pattern is projected onto a screen 4 from each projector 3 under control of a personal computer or other calibration device 10a, pictures are taken by a digital camera or other image pick-up device 11, and the results are supplied to the calibration device 10a. The calibration device 10a uses the supplied picture data to calculate parameters in order to perform picture positioning, color adjustment, brightness adjustment and other adjustments and corrections, and based on the calculation results transforms the original picture data, generates and supplies signals indicating projection conditions to each of the projectors 3, and performs image calibration control of the pictures projected by each projector 3. Here at the time of taking pictures, by installing on the image pick-up device 11 a shielding member 12 formed into a tetragonal pyramid shape, the light-receiving part of the image pick-up device 11 and the screen are completely shielded from ambient external light. By this means, the measurement precision of the image pick-up device 11 is improved, and accurate and reliable image calibration is performed.
摘要:
A multi vision device including a projection device constituted by an array of a plurality of projection units each including a rear projection projector and a housing to support the rear projection projector; and a screen located away from the projection device and displays pictures projected from the projection device. Pictures projected from the adjoining projection units overlap on the screen and are configured to form one picture on the screen. In this manner, highly accurate projected pictures are obtained with no borders between the pictures adjacent to each other. The height and width of the pictures projected onto the screen are greater than the height and width on the side of the projection device that faces the screen.
摘要:
A method for improving the ground or foundation by injecting a grouting agent from the tip end of a hollow injection rod inserted into a boring hole formed in the ground at site so as to infiltrate it into the ground to be solidified. The injection is carried out by varying an injection pressure or injection rate depending on the intensity, particularly, the tensile strength, of the ground so that no vein-like coagulation can be formed around the injection rod, and a columnar or spherical coagulation can be formed.
摘要:
A rotary cutter head for use with a rotating filament trimmer in which a reel for winding cords or filaments is held between a housing covering a lower portion thereof and a retainer or hub fixed on the driven rotating shaft of the trimmer unit and is rotatably disposed within the housing. Within the bore of the reel, an axially movable slider is normally biased toward the retainer by the elastic force of a spring so that meshing engagement occurs between a peripheral array of axially projecting tongues formed on one end of the slider and a plurality of radial teeth-like ribs formed on the inner side of the retainer and establishes a driving connection to rotate the reels. By applying an axial impact against the housing, the slider is moved axially by inertial forces against the biasing force of the spring to release that engagement, and axially projecting detent fingers formed around the other end of the slider press against the opposed slopes of a circular rib formed on the inner side of the housing and bring about both positive relative rotation of the reel and fix a limit to such rotation to a predetermined amount thereby to play out a limited length of fresh cords. In order that the reel may rotate in an opposite direction to rewind the cords, moreover, the radial ribs formed on the retainer and the tongues of the slider are formed with opposed cooperating cam slopes which force the slider axially until the tongues are clear of the ribs during backward rotation.
摘要:
A sheet feeder is adapted to feed sheets, received in a stack within a sheet cassette, one by one by a feed roller which rocks in response to a feed signal. The sheet feeder includes a detecting member for detecting the number of sheets left within the cassette, and means responsive to a signal from the detecting member for controlling the timing when the feed signal is produced. In this manner, an amount of flexure produced in the sheet being fed before it reaches resistor rollers is maintained constant.
摘要:
A table type display device capable of selecting the best projector according to user's budget and mode is provided for with easy exchange of the projector.The table type display device comprises four projectors 1LU, 1LL, 1RU, and 1RL for projecting luminous flux to form image, reflection mirrors 2U and 2L for bending an optical path of luminance flux projected from each of these projectors, and a screen 3 of horizontal installation type for projecting luminous flux with its optical path being bent by reflection mirrors 2U and 2L, onto predetermined regions respectively.The screen housing portion 4b of the main body unit 4 accommodates the screen 3, the reflection mirrors 2U and 2L, and the light shading plates 6LU, 6LL, 6RU, and 6RL, and the projector unit housing portion 4a of the main body unit 4 accommodates projectors 1LU, 1LL, 1RU, and 1RL housed by the projector unit 5.
摘要:
An electrophotographic apparatus of the retention type is provided with a record paper detection assembly which generates a paper shortage signal when the number of record papers stored in a paper cassette is decreased to a predetermined small number substantially equal to the number of copies which can be formed from a single latent image. When the paper shortage signal is produced during a retention copy for a document, the copying operation is completed for the current document, but further copying operation for a next document is inhibited. After the copying operation for the current document has been finished, an indication lamp is lighted to indicate that the remaining number of record papers in the cassette has been reduced to the predetermined number. Further, the copying operation for the next document which has been set on a document table can be initiated automatically after the paper cassette with a sufficient number of papers stored therein has been attached to the apparatus.
摘要:
An image forming apparatus includes an image carrier rotatably disposed in a main body and having an image carrier surface, a transfer unit for transferring a toner image formed on the image carrier surface to a recording member, and a cleaning blade located in a downstream side of the transfer unit in a rotational direction of the image carrier and scraping a residual toner left on the image carrier surface. The transfer unit is located on a portion of the image carrier such that an imaginary normal extending outward from the image carrier surface is directed upward with respect to a horizontal direction and the transfer unit transfers the toner image to a lower surface of the recording member. The cleaning blade is brought into contact with a downward moving portion of the image carrier which has passed through the transfer unit, at a contact angle of not less than 90.degree. relative to the downstream portion of the carrier in a "with" contact state, and the residual toner scraped by the cleaning blade is moved downard along an upper surface of the cleaning blade.
摘要:
A boring-injection device comprises a fluid supplying hollow rod, a fluid discharge portion at the lower end of the rod, and a packer element inflatable from the rod to seal a space between the rod and a borehole wall at a desired depth position. The rod is surrounded by a sheath so that the packer element and fluid discharge portion can be protruded out of and retracted within the sheath in a body. They are retracted during the boring operation and protruded during injecting or investigating operation. The device can be used for practising a method of ground improvement or a method of ground investigation.
摘要:
A control lever assembly for a lawn mower has a main lever and an auxiliary lever pivotably mounted on lawn mower handle. The main lever is operatively connected through spring biased wire to tend to open a clutch and apply a brake for a rotary cutter of the lawn mower. The auxiliary lever when manually held against the mower handle pushes a resilient arm on the main lever out of engagement with a first stop on the body, thereby automatically causing the main lever to connect the clutch and disengage the brake. A spring biased second movable stop on the auxiliary lever is received in a recess in the main lever to detent the main lever in the locked position for operation of the mower. When the auxiliary lever is released manually by the operator, the second movable stop carried thereby is retracted out of the recess on the main lever to automatically return the wire to disconnect the clutch and engage the brake.