Abstract: A driver for a light emitting device comprises first and second switching means associated with the light emitting device and application means for applying voltages to the first and second switching means to perform the switching operation in accordance with an input signal. The application means applies voltages of essentially same level to the first and second switching means.

Abstract: This invention relates to an image forming apparatus having a convey path comprising lateral movement apparatus for controlling a widthwise position of a sheet member to be conveyed, wherein the lateral movement apparatus is curved in a convey direction.

Abstract: Disclosed is a method for separating and recovering very small amounts of biologically active proteins (such as enzymes, antigens and antibodies) present in a various fluids, with a high recovery and on a large scale, in which a fluid containing a desired protein is introduced into a rotary column through orifices therein and brought into contact with a gel carrier capable of selectively adsorbing the desired protein, while the carrier is being gentle fluidized in a liquid by the rotary motion successively by wash water and eluting fluid, so that the column, after which the fluid is displaced, the carrier having the desired protein adsorbed thereon is washed and the desired protein is recovered therefrom by elution while the carrier fluidized.

Abstract: A plurality of probe wires are held by a probe supporter having a substantially rectangular cross-section. First, second and third side walls of the supporter, support the probe wires in a manner wherein they are arranged at predetermined intervals in an essentially parallel relationship with each other. The probe wires respectively extend from the first side wall to the second side wall by way of the third side wall. When testing an electronic-device, the third side wall faces a main surface of the device. The third side wall has a groove extending in a direction parallel with the main surface of at least one of the first and second sides wall. Each of the probe wires crosses the groove in a direction perpendicular to the direction along which the groove extends. The portions of the wires which cross the groove are pressed against the tested terminals.

Abstract: A substrate for an optical disc is disclosed, which comprises a transparent hydrocarbon resin having a softening point of not less than 100.degree. C., the surface thereof having been contact treated with a fluorine-containing gas so that the treated surface has a contact angle with water of not more than 90.degree. and the weight gain due to the treatment does not exceed 1% by weight. The substrate exhibits excellent adhesion to a recording layer formed thereon and excellent heat resistance.

Abstract: A heating furnace for semiconductor wafers having a heater arranged around a core tube, layers of a heat insulating material made of a porous heat insulating material or ceramic fibers arranged around the heater, and layers of a heat reflecting material arranged in the layers of the heat insulating material.

Abstract: A light quantity control device suitable for use in a laser beam printer. A controller varies the quantity of light emitted by a semiconductor laser so as to maintain a constant light quantity, regulating the rate of variation of the light quantity according to the output of a monitor for detecting the quantity of light emitted from the semiconductor laser.