近年来,一种不用胶片的新型数字照相机已经悄然进入专业摄影领域。数字照相机的感光元件不是胶片,而是电荷耦合器件(CCD)。当通过照相机镜头形成的影像映到CCD上时,CCD将影像转换成模拟电信号,再通过A/D转换器将模拟图像信号转换成数码信号,存储在数字照相机的PC卡(图像存储器)上。PC卡内包含有半导体存储器和控制器等电路,它的作用相当于普通相机的胶卷。PC卡的尺寸 In recent years, a new type of digital camera without film has quietly entered the field of professional photography. The digital camera’s photosensitive element is not a film, but a charge-coupled device (CCD). When the image formed by the camera lens is reflected on the CCD, the CCD converts the image into an analog electrical signal, which is then converted into a digital signal by an A / D converter and stored on a digital camera’s PC card (image memory) . PC card contains semiconductor memory and controller circuit, which is equivalent to the normal camera film. PC card size