Abstract:
An inspection device of an object, comprising: a laser beam source for oscillating a laser beam and irradiating the laser beam onto a surface of an object to be inspected, a rotary table for loading and rotating the object, a moving mechanism for moving the rotary table in a transfer direction of the object, a plurality of light receptors disposed above the object for receiving a scattering light scattered from the surface of the object when the laser beam irradiated from the laser beam source onto the surface of the object loaded on the rotary table, and a data processor for performing operations on the basis of received signals of the scattering light received by the plurality of light receptors and discriminating a boundary position between a flat plane area of the surface of the object which is irradiated with the laser beam and a predetermined area corresponding to an edge portion outside the plane area.
Abstract:
Provided are a surface inspection method and a surface inspection apparatus that are capable of detecting scattered light from a contaminant particle and a defect at a good S/N even when the relative ratio of background scattered light to the total quantity of scattered light and the anisotropy of background scattered light in angular directions are not relatively large in a case where background scattered light deriving from the surface roughness of a semiconductor wafer has directivity in a direction of an elevation angle or an azimuthal angle and in a case where the directivity of background scattered light changes depending on positions on a wafer to be inspected. In surface inspection according to the present invention, by use of a plurality of photodetectors arranged in a plurality of directions, light scattered, diffracted or reflected on a surface of an object to be inspected or in the vicinity of the surface is detected and a plurality of signals obtained by this are subjected to weighted addition processing or weighted averaging processing by linear combination, whereby a contaminant particle and a defect on a surface of an object to be inspected and the like are detected. The size of a contaminant particle and a defect is calculated from results of the weighted addition processing or weighted averaging processing.
Abstract:
An optical inspection apparatus irradiates a light beam onto the outer surface of an object to be inspected, in the form of an illumination spot having an illumination intensity which is higher in the outer peripheral part of the object to be inspected than in the inner peripheral part thereof while uniformly maintains a temperature rise caused by the irradiation of the light beam, over the outer surface of the object to be inspected, in order to prevent the effective entire signal value of a scattered light signal from lowering, without lowering the linear speed of a movable stage for the object to be inspected in the outer peripheral part of the object to be inspected, thereby it is possible to prevent lowering of the detectability for a foreign matter or a defect, for preventing lowering of inspection throughput.
Abstract:
A device according to the present invention includes an interferometer which produces interference fringes from light received from a light source. The interference fringes are imaged onto a photo-diode array which transforms the imaged interference fringes into a single set of electric signals. The single set of electric signals is digitized and stored as a group of consecutive data points which represent an interferogram signal containing a DC component. The data points are processed to obtain moving average values representing the DC component of the interferogram signal. The moving average values are subtracted from the data points to obtain a clean interferogram signal which is Fourier-transformed to obtain a spectrogram of the light source.
Abstract:
A switch device is disclosed, which comprises a mounting frame provided with a switch body or bodies, a reinforcing frame to be provided with a plate, placed on the surface of a building-forming material and threadedly fixed to the mounting frame, a decorative frame fixed integrally with or separately from the reinforcing frame, and a decorative surface sheet or sheets to be fitted into the decorative frame and attached to a switch-working portion or portions of the switch body or bodies and having an area larger than that of the switch body or bodies. A light display for indicating the on.off state of the switch is or are formed on the decorative surface sheet or sheets.
Abstract:
Method for measuring the time dependence of an oscillating field gradient and representatively its integral function with respect to time for imaging method using the field gradient such as rapid chemical shift imaging method echo planar method, etc. A uniform specimen is placed within a coil of an NMR device, in which nuclear spins are excited; a phase encoding field gradient is applied thereto; and signals are sampled under application of the field gradient to be measured. These steps are repeated and an integral function of the field gradient with respect to time is obtained by using the peak position in the series of data obtained by this repetition.
Abstract:
Disclosed is a spectrophotometer capable of achieving a good signal-to-noise ratio by improving the use efficiency of the amount of light emitted from a Xe flash lamp or other intermittent light source. Light having a desired wavelength is selected from the light emitted from the Xe flash lamp (1), which is a single light source having a wide wavelength range, allowed to pass through a sample (7), detected by a photodetector (21, 22), and supplied to a low-pass filter (24) in a signal processing circuit (23). The duration of the waveform of a signal output from the photodetector (21, 22) is extended by the low-pass filter (24), which has a time constant equivalent to the elapsed time required for the intensity of the light emitted from the Xe flash lamp (1) to decrease from a peak value to a half value and acts as delay means or other duration extension means. The signal having a waveform whose duration is extended is supplied to a computer (30) through an amplifier (25) and an analog-to-digital conversion circuit (26). As the signal having the waveform whose duration is extended can be used, it is possible to enhance the use efficiency of the total amount of emitted light and optimize the effect of signal-to-noise ratio improvement.
Abstract:
An object of the present invention is to provide a capillary electrophoresis apparatus in which simultaneity can be ensured between sensitivity and data acquisition to decrease a pull-up signal while spectral data acquisition is eliminated in each capillary exchange. The invention relates to a capillary electrophoresis apparatus characterized in that a multi-bandpass filter is provided in an optical detection system. In one aspect of the invention, a signal detection area of a two-dimensional detector is divided into plural regions corresponding to wavelength transmission regions of the multi-bandpass filter. An integrated value of the fluorescence spectrum signal is determined in the region including a fluorescence spectrum peak of an analysis sample in the plural regions. The analysis is performed with the integrated value.
Abstract:
In the conventional contaminant particle/defect inspection method, if the illuminance of the illumination beam is held at not more than a predetermined upper limit value not to give thermal damage to the sample, the detection sensitivity and the inspection speed being in the tradeoff relation with each other, it is very difficult to improve one of the detection sensitivity and the inspection speed without sacrificing the other or improve both at the same time. The invention provides an improved optical inspection method and an improved optical inspection apparatus, in which a pulse laser is used as a light source, and a laser beam flux is split into a plurality of laser beam fluxes which are given different time delay to form a plurality of illumination spots. The scattered light signal from each illumination spot is isolated and detected by using a light emission start timing signal for each illumination spot.