Method and apparatus for fastening adjustable optical lenses

#1. Field of the Invention

#The invention relates in general to a method and an apparatus for fastening adjustable optical lenses. The method and the apparatus can be adapted for an optical scanner.

#2. Description of the Related Art

#The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. A simple description of the drawings is as follows.

#FIG. 1 is a cross-sectional view schematically showing a conventional optical scanner.

#FIG. 2 is an exploded perspective view schematically showing a structure of fastening an optical-lens assembly in a conventional optical scanner.

#Referring to FIG. 3, there is a scanning chassis of a conventional optical scanner. A light source 1100, a reflector group 1400, an optical-lens group 1510, and an optical sensor, such as charged couple device (CCD) 1600, are mounted in a case 1700 of the scanning chassis. During scanning, after the light source 1100 illuminates a document 1200, an image of the document 1200 can be obtained. The reflector group 1400 is composed of many reflectors 1401, 1402, 1403 that reflect the image of the document 1200 to transmit it to the optical-lens group 1510. The optical-lens group 1510 can receive the image, transmitted by the reflector group 1400, of the document 1200 and can form the image onto the charged couple device 1600.

#In the following, a method for fastening adjustable optical lenses is described. As shown in FIG. 3, FIG. 4 and FIG. 5, first, the apparatus for fastening adjustable optical lenses is provided with an optical-lens pedestal 1710, integrally formed in the case 1700, and a fastening cover 1520. The optical-lens pedestal 1710 is located between the optical sensor 1600 and the reflector group 1400. The optical-lens pedestal 1710 has a channel 1719 and the two sides of the channel 1719 are open. There are many grooves 1711 on the side wall of the channel 1719. Next, the optical lens 1511, 1512, 1513 of the optical-lens group 1510 can be respectively mounted on the grooves 1711 and the relative position of the optical lens 1511, 1512, 1513 can be precisely adjusted. The optical-lens group 1510 is located between the optical sensor 1600 and the reflector group 1400. The optical-lens group 1510 can receive the image of the document and can form the image onto the optical sensor 1600. Following, the fastening cover 1520 is fixed on the optical-lens pedestal 1710 so that the optical lenses 1511, 1512, 1513 are firmly fixed between the optical-lens 1710 and the fastening cover 1520. The fastening cover 1520 is provided with two hooks 1522 that can be respectively coupled with two hooking ditches 1712 of the optical-lens pedestal 1710 so that the fastening cover 1520 can be firmly fixed on the optical-lens pedestal 1710.

#In the above description, the fastening cover is fixed on the optical-lens pedestal by means of hooks and hooking ditches. However, the invention is not limited to the above application. As shown in FIG. 6, screws 1800 can be screwed through first screw holes 1524 of a fastening cover 1520 and then into second screw holes 1713 of a optical-lens pedestal 1710 so that the fastening cover 1520 can be firmly fixed or the optical-lens pedestal 1710. Otherwise, the fastening cover can be fixed on the optical-lens pedestal by coating an adhesive. Besides, if the optical lenses can be firmly fixed on the optical-lens pedestal, even a fastening cover can be saved.