Abstract: A large-scale display device has a plurality of display units, a plurality of screens and a plurality of adhesive bands. The plurality of display units is arranged in a matrix, and Frensnel lens screen(s) and diffuser screen(s) are correspondingly overlaid on the display units. The adhesive bands are used to affix the screens to the plurality of display units, or affix the plurality of Fresnel lens screens to the plurality of display units, followed by disposing a large-area diffuser screen on the previous screens. The sizes of the gaps between adjacent display units and the dark stripe in the large-scale image are thus reduced, such that the aesthetic feeling of the large-scale image is enhanced.

Abstract: A pressure is exerted on a paper to flatten the paper being fed in the paper feeder for an image reader and to avoid distortion due to paper warping. The pressure is exerted along the line where the incident light is reflected from the paper.

Abstract: An automatic paper feeder uses a paper guide with two separate lower blades for feeding the paper past a scan window. The separate blades provide smooth passage of the paper over the scan window and avoiding rubbing the scan window surface. When the paper feeding mechanism is used both for automatic paper feeding scanning and for flat-fed scanning, the image sensor position is changed for the two applications, because the former scan window lies over the larger scan window for flat bed scanning and the elevations of the scanned papers for the two situations are different. The vertical position of the image sensor can be changed to maintain equal distance between the scan surface and the image sensor.

Abstract: A resilient friction pad is pushed by a spring against a conveying roller for feeding paper automatically in a printer. The friction pad is placed in a recess at the end of the paper tray. A flat auxiliary spring may be used to share the pressure of a heavy paper load and to prevent the separation of the resilient friction pad and the conveying roller. A support block may be placed underneath the resilient friction pad to prevent sagging of the resilient friction pad. A corrugated arm may be inserted between the push-up spring and the resilient friction pad to provide wider contact between the resilient friction pad and the conveying roller. Two springboards, one wider than the other, are located at the tail end of the resilient friction pad, one to lift to paper tray when the paper stack is light and the other to depress the paper stack so that paper in the upper section of the remaining paper stack does not push the paper being fed so hard that more than one sheet of paper are fed.

Abstract: A resilient friction pad is pushed by a spring against a conveying roller for feeding paper automatically in a printer. The friction pad is placed in a recess at the end of the paper tray. A flat auxiliary spring may be used to share the pressure of a heavy paper load and to prevent the separation of the resilient friction pad and the conveying roller. A support block may be placed underneath the resilient friction pad to prevent sagging of the resilient friction pad. A corrugated arm may be inserted between the push-up spring and the resilient friction pad to provide wider contact between the resilient friction pad and the conveying roller. Two springs are located at the tail end of the resilient friction pad: one to lift to paper tray when the paper stack is light and the other to depress the paper stack so that paper in the upper section of the remaining paper stack does not push the paper being fed so hard that more than one sheet of paper are fed.

Abstract: A resilient friction pad is pushed by a spring against a conveying roller for feeding paper automatically in a printer. The function pad is placed in a recess at the end of the paper tray. A flat auxiliary spring may be used to share the pressure of a heavy paper load and to prevent the separation of the resilient friction pad and the conveying roller. A support block may be placed underneath the resilient friction pad to prevent sagging of the resilient friction pad. A corrugated arm may be inserted between the push-up spring and the resilient friction pad to provide wider contact between the resilient friction pad and the conveying roller.