Abstract: A production method for an optical disc master includes the steps of: preparing a substrate; forming an intermediate layer having a predetermined thickness on the substrate; forming an inorganic resist layer having a thickness on the intermediate layer, a ratio of the thickness of the intermediate layer to the thickness of the inorganic resist layer being in a range between 0.8:1 and 1.5:1; irradiating the inorganic resist layer with a laser beam to selectively expose the inorganic resist layer; and developing the selectively exposed inorganic resist layer.

Abstract: A developing method includes the steps of setting a resist substrate on a turntable, the resist substrate including a substrate, an inorganic resist layer formed on the substrate, and a latent image formed by exposure to light; discharging developer to a developer application position on an upper surface of the inorganic resist layer while rotating the turntable, the developer application position being away from the center of the resist substrate; irradiating a monitor position on the upper surface of the inorganic resist layer with laser light, the monitor position being different from the developer application position; and continuously discharging the developer, while detecting the amounts of zeroth order light and first order light reflected by the upper surface of the inorganic resist layer and monitoring the light amount ratio of the first order light to the zeroth order light, until the light amount ratio becomes a predetermined value.

Abstract: A production method for an optical disc master includes the steps of: preparing a substrate; forming an intermediate layer having a predetermined thickness on the substrate; forming an inorganic resist layer having a thickness on the intermediate layer, a ratio of the thickness of the intermediate layer to the thickness of the inorganic resist layer being in a range between 0.8:1 and 1.5:1; irradiating the inorganic resist layer with a laser beam to selectively expose the inorganic resist layer; and developing the selectively exposed inorganic resist layer.

Abstract: A circuit breaker with a completely electromagnetic type overcurrent tripping device has a flexibility for changes in the production schedule of the overcurrent tripping device. An overcurrent tripping device for each pole is integrally housed in a common unit case, which is then inserted into a case of the circuit breaker. In this case, a yoke of the overcurrent tripping device is combined with an oil dash pot inserted into a coil, and the combined parts are pressed and fixed in the unit case without soldering. Thus, the coil, which is changed depending on the rated current, and the yoke and oil dash pot which are common products, can be separately stored prior to assembly, thereby enabling flexible responses to changes in the production schedule. In addition, the yoke and the oil dash pot need not be soldered and are fixed individually to the unit case, thereby reducing the number of assembly operations.