Abstract: The present invention provides a resolution adjustment method for adjusting the resolution of a scanning module. The scanning module is installed in a scanner for scanning a document and comprises a case with a line-shaped opening on its top for receiving light from the document, a sensor installed in the case and comprising linearly arranged sensing units for scanning the light from the document and generating correspondent image signals, a lens installed in the case for converging the light from the document to the sensor, and a mirror module installed in the case for passing the light from the document through the lens to the sensor. The resolution adjustment method provides the scanning module with a calibration picture for generating a calibration image which comprises two groups of parallel lines in two directions for calibrating the resolutions of the sensor in the two different directions.

Abstract: The present invention relates to a scanning method of an image scanning system for scanning a plurality of designated areas. The system comprises a transparent platform having front, rear, left and right ends for placing documents, and a scanning module for scanning the designated areas within the platform in a front-to-rear direction.

Abstract: The invention discloses a multi-resolution scanner that scans documents without moving scanner components. Single light source and lenses with different resolutions are combined for scanning the transparent and the reflective documents that reduces the scanner sizes and cost. Lights from the transparent documents follow different optical path with the reflective documents' to project to the charged-coupled device. The transparent documents and the reflective documents respectively use a lens with different resolution for achieving the documents' requirements.

Abstract: A hidden document-covering device for a scanner, especially for a scanner built in the case of a computer in which a device is used for holding the document on a moving tray during scanning process. The document-covering device always hides itself in the case even when the tray moves out. During the scanning process, the document for scanning is firmly pressed onto the tray to prevent from curling or sliding. After scanning, i.e. when the tray moving out, the document-covering device will release the document for easy loading and unloading.

Abstract: A device for holding a Charge Couple Device (CCD) in an optical scanner where optical alignment of the CCD to the position of scanned image of document can be easily made. The device includes a holder for holding a lens and providing a focused image taken from the scanned document; a positioning element mounted on the holder for adapting a CCD to be slightly rotated in a plane around a pivot point fixed on the holder and aligned with the focused image. The positioning element is furnished with a matching hole for precisely carrying a bottom portion of the CCD. The positioning element mounting to the holder needs only one dimensional adjustment which is easier and more effective.

Abstract: A built-in scanner for computers includes a transport portion and a case. The case is mounted in a computer, and the transport portion is extractive. There is only one way to feed document sheets, the document sheet is thus smoothly and fed through the built-in scanner without vibration. As the transport portion is engaged into the case, the built-in scanner is completely assembled. The transport portion of the built-in scanner can transport document sheets one by one for scanning. In addition, as the document sheet is jammed, the transport portion of the built-in scanner can be extracted for repairing.

Abstract: A device for holding a charge couple device (CCD) in an optical scanner he optical alignment of the CCD to the position of scanned image of document can be easily made. The device includes a holder for holding a lens and providing a focused image taken from the scanned document; and a positioning element precisely fitted to the holder by fitting means, adapting a CCD aligned with the focused image. The positioning element is furnished with a matching hole for carrying a bottom portion of said CCD. Some positioning bosses and holes are correspondingly furnished on the positioning elements and the holder for matching each other so that optical alignment of the CCD relative to the holder can be easily made by the assembly without further adjustment.

Abstract: The present invention provides an AGC (automatic gain control) device used in a displaying device such as an LCD projector for converting an analog color signal generated by a VGA card into a digital color signal. The AGC device comprises an A/D converter for converting the analog color signal into the digital color signal according to an upper reference voltage and a lower reference voltage, generating an overflow signal when the voltage of the analog color signal exceeds the upper reference voltage, and generating an underflow signal when the voltage of the analog color signal is below the lower reference voltage; and a feedback circuit for generating the upper and lower reference voltages. When receiving the overflow or underflow signal, the feedback circuit will increase the upper reference voltage or decrease the lower reference voltage so as to allow the A/D converter to completely convert the analog color signal into the digital color signal.

Abstract: The present invention provides a locking device for locking a scanning module in a scanner. The locking device comprises a protruding member installed on the scanning module, a C-shaped shaft sink and an elastic button installed on the bottom panel of the housing of the scanner, an recess installed at the right edge of the housing, a blocking member rotatably installed in the shaft sink for separately locking the protruding member of the scanning module, and a sliding member slidably installed in the recess for horizontally rotating the blocking member to lock or release the protruding member of the scanning module.

Abstract: The present invention relates to a rotary drum type optical filter apparatus, which comprises a filter unit for receiving an optical signal to spectralize the optical signal; a lens unit provided at the center of the filter unit for varying an optical path of the optical signal; and a driving device engaged with the filter unit for providing a displacement of the filter unit relative to the lens unit to obtain different spectrum colors of the optical signal.

Abstract: This relates to an image scanner with a function of initiating scanning automatically. In addition to the main light source, an independent light source is provided in an image scanner for supplying a specific light signal, and a corresponding sensing window is also provided for detecting the open/close status of the top cover by means of the existing CCD/CIS in the image scanner, and decide the scanning of the document automatically or not accordingly. The independent light source being provided can be lighted on continually or be flickering for cooperating with the sensing window for detecting the open/close status of the top cover.

Abstract: A cost-effective optical device is used for converting a photo-image into electronic signals with high resolution. The optical device includes a plurality of focusing units for receiving a plurality of sections of the photo-image respectively, and generating a plurality of corresponding focused image sections wherein the focusing units are mounted in specific locations for focusing the plurality of sections of the photo-image through various light paths and at various distance, and the plurality of corresponding focused image sections are magnified with the same ratio, a photoelectric conversion unit for sequentially converting the plurality of corresponding focused image sections into the electronic signals, and a light-reflecting unit mounted between the plurality of focusing units and the photoelectric conversion unit for sequentially transmitting the plurality of corresponding focused image sections to the photoelectric conversion unit.