Abstract: A semiconductor laser driving circuit for driving a semiconductor laser as an exposure light source is used in an image recording apparatus for recording an image using a light beam from the laser. The light beam emitted from the laser is subjected to pulse modulation in correspondence with a command signal. The circuit includes an error amplifier for amplifying a difference between the command signal and a signal fed back from the laser to output an output signal, a diode and a resistor connected in series between an input terminal and an output terminal of the error amplifier and a driver for driving the laser based on the output signal.

Abstract: An image storage and display system transmits required image data such as original image data and irreversible compressed image data expediently. Original image data input to the image server from the input modality is subjected to a data compression process by the server computer ad irreversible compressed image data having a decompression ratio of 1/20, 1/50, etc. is thereby produced. In this way, three versions of image data, original image data, and two irreversible compressed image data having different compression ratios are created for a single image and stored in a temporary storage medium. A request is issued from a workstation, connected to the image server via a network, for transmission of the version of image data to be acquired, and the requested image data is read out from the temporary storage medium, transmitted to the workstation and displayed on a monitor.