Abstract: A probe needle having a coaxial structure that facilitates assembly of a probe card. The probe needle is manufactured by covering a central conductive body with an insulative tube, and forming a conductive layer around the insulative tube by superimposing a film of fine conductive grains around the insulative tube.

Abstract: An object of this invention is to provide a band distribution inspecting device and band distribution inspecting method capable of carrying out inspection on whether or not a scattered oscillation signal oscillated containing a frequency variation from the fundamental frequency with the fundamental frequency as a reference point has a band distribution rapidly, with a simple way and at a cheap price. A scattered oscillation signal SSS inputted to a band distribution detecting section 22 is outputted as a predetermined band pass signal SBP through a band pass filter 17 having a predetermined pass band of a predetermined narrow-band width ?f within a band distribution. This signal is converted to a root-mean-square value by a smoother 19, smoothed by a capacitor C1 and transferred to a general purpose inspecting device 21 as a DC signal SAV.

Abstract: A laser plate-making apparatus includes a moistureproof paper feed magazine for feeding plate materials one by one, each having a photosensitive layer, a charger for charging the plate material with an electric charge, an exposing unit for exposing the plate material charged with the electric charge, using a laser beam modulated in accordance with a plate-making image to partially neutralize the electric charge and form an electrostatic latent image, a developing unit for developing the electrostatic latent image by applying a developing solution to the plate material, the developing unit being located at the lowest position in a convey path, and including an arcuated pair of electrodes through which the plate material passes and to which a predetermined voltage is applied, a developing solution concentration sensor having detachable special cells and using a light-emitting diode, and a squeezing roller pair for squeezing out an excess developing solution from the developed plate material, the developing solu