摘要:
Plasma P that is caused to fluctuate by a magnet 128 is generated inside a reaction chamber 102 of an etching apparatus 100. The signal of the fluctuating plasma light detected at a photosensor unit 136 via a detection window 134 is sampled over a constant sampling cycle with a arithmatic control unit 120 to obtain data strings. A plurality of hypothetical fluctuation cycles are hypothesized and the step for calculating the moving average values during the individual hypothetical fluctuation cycles using the data strings is repeated, then arithmetic processing is performed on the moving average values calculated for the individual repetition timings to create moving average value data for each of the hypothetical fluctuation cycles to ascertain approximate expressions corresponding to the individual hypothetical fluctuation cycles. In addition, deviation quantities between data strings of the individual moving average values and the corresponding approximate expressions during a given period are calculated, and the hypothetical fluctuation cycle corresponding to the smallest deviation quantity is determined as the fluctuation cycle of the plasma P. Based upon the fluctuation cycle thus determined, the data string of the moving average value is ascertained from the data strings of the sampling signal to determine the endpoint for the processing.
摘要:
A laser beam scanning apparatus and method for providing controllable print density. The laser beam scanning apparatus includes a modulator for modulating a light beam, a rotating polygon mirror for deflectively scanning a light beam which is passed through the modulator, at least one lens unit having at least one lens which is movable to a position on the optical axis and a position completely off the optical axis, and a controller for switching the modulating clock frequency of the modulator and the rotating speed of the polygon mirror together with selective shifting of the at least one lens unit or lens thereof to a position on the optical axis or completely off the optical axis whereby the method effects control of the apparatus for controlling print density.
摘要:
When processing using a plasma is performed for an object to be processed, a photodetecting unit sequentially detects emission of two active species having specific wavelengths in a designated period during the processing. On the basis of the emission detection information of the two active species, two approximate expressions of linear functions are obtained in the relationship between the emission intensity and time. The ratio of the two approximate expressions of linear functions and the derivative of the ratio are obtained to form a graph in which the ratio is plotted on the abscissa, the derivative of the ratio is plotted on the ordinate, and the intersection between the average value of the ratio and the average value of the derivative of the ratio is the origin. The ratio and the derivative of the ratio are obtained by using the emission detection information of the two active species during the processing after the designated period. The end point of the plasma processing is determined when the position of the ratio and the derivative of the ratio thus obtained deviates from a predetermined region in the graph.
摘要:
An endpoint detector for plasma etching comprises a photo detecting section for receiving an emission spectrum of plasma due to etching gas from a process chamber for providing plasma etching to a processing object so as to detect a specific waveform of the received emission spectrum, a calculating section for detecting an endpoint of an etching process based on a detecting signal sent from the photo detecting means, the photo detecting section comprises a first optical system for detecting light having a specific wavelength from the emission spectrum received from the process chamber so as to be photoelectrically transferred, and a second optical system for detecting a part of the emission spectrum so as to be photoelectrically transferred before light having a specific wavelength is extracted from the emission spectrum by the first optical system, and the calculating section reduces drift of an electrical signal, which is based on light having a specific wavelength extracted from the first optical system, based on an electrical signal, which is based on light extracted from the second optical system, so as to detect the endpoint of the etching process.
摘要:
Method and device for detecting the end point of a plasma process, the method and device being capable of making it unnecessary to set a threshold every process or every processed object and also capable of correctly detecting the end point of the plasma process even if process conditions are changed. The method and device can be therefore used for more purposes. According to the end point detecting method realized by the end point detecting device, the emission spectrum of an active species having a specific wavelength and caused when a semiconductor wafer W is processed with plasma P is detected by a photodetector and the end point of the plasma process is detected on the basis of light strength changes of the emission spectrum. More specifically, an average value m and dispersed ones .sigma..sup.2 of light strengths I are calculated for a predetermined time period T.sub.1 at the initial process stage by a first arithmetical unit and the differences of light strengths I relative to the average value m are calculated after the lapse of the predetermined time period T.sub.1 by a second arithmetical unit. These differences are compared with the dispersed values .sigma..sup.2 by a comparator and the time at which values thus obtained exceed a predetermined reference value is decided to be the end point of the plasma process.
摘要:
An electrophotographic image recording apparatus that forms an electrostatic latent image so that the uniformly charged surface of a photoreceptor is scanned for its exposure with a beam spot of a light beam generated according to image information, to discharge the surface of the photoreceptor up to a medium potential. The electrophotographic image recording apparatus includes a light beam generator capable of varying an amount of light beam and a light intensity distribution pattern of a beam spot on the surface of the photoreceptor, an intensity distribution pattern controller for controlling the light beam generator according to the image information of peripheral pixels, to vary the intensity distribution pattern of the beam spot on the surface of the photoreceptor, and a light beam output controller for controlling the light beam generator to put the exposure energy on pixels, exposed to the beam spots of intensity distribution patterns, at a predetermined value.
摘要:
A color toner and a black toner for electrostatic charge development comprises a binder resin and a colorant, wherein the binder resin comprises a polyester resin containing (a) an ethoxylated bisphenol type diol, (b) a propoxylated bisphenol type diol and (c) an aromatic dicarboxylic acid or an anhydride or ester thereof, as main monomer components, and the polyester resin further containing (d) at least one compound selected from the group consisting of alkylsuccinic acids, acid anhydrides and esters thereof, alkenylsuccinic acids, and acid anhydrides and esters thereof in an amount of 7 to 25 mol % based on the total monomer amount of the polyester resin, and the colorant is a flushing pigment comprising hydrous paste of an organic pigment and the polyester resin, or comprising a carbon black having a primary particle size of from not less than 30 nm to not more than 50 nm. Furthermore, a method for producing the color toner and the black toner, and an method for forming a full color image using the color toners or using the color toners and the black toner in combination, are disclosed.
摘要:
A simple optical recorder which permits alignment of scanning positions of a plurality of laser beams with high accuracy and effects optical recording using the laser beams. The optical recorder is provided with a photosensitive drum which is scanned by a plurality of laser beams formed in rows at an inclined angle with respect to the direction of scan, a single photosensor for sensing each of the sweep positions of the laser beams, and a controller for controlling the scanning positions of the laser beams on the basis of a sensing result of the sensor. The controller is made up of an optical sensing signal separation circuit, synchronous clock generation circuits, FIFO memory circuit elements, and OR circuits.
摘要:
A wavelength stabilizing light source apparatus comprising a light source, a beam splitter, a scanning mirror, a reflector, a first and a second light receiver, a phase detector and a wavelength stabilizer. The first light receiver receives a first interference signal formed from the interference between the coherent light coming from the scanning mirror and coherent light reflected by the first reflecting surface. The second light receiver receives a second interference signal formed from the interference between the coherent light coming from the scanning mirror and the coherent light reflected by the second reflecting surface. The phase detector detects the difference in phase between the first and the second interference signal. The wavelength stabilizer stabilizes the wavelength of the light source by keeping constant the phase difference detected by the phase detector. The apparatus also includes an optical path length difference forming device for keeping a constant difference in length between the first optical path of its first member and the second optical path of its second member despite changes in temperature.
摘要:
An electrophotographic toner composition comprising toner particles containing at least a colorant, a binder resin and an additive, and an image formation method using the toner composition are disclosed, wherein said additive is an additive prepared by surface-treating titanium dioxide fine particles having less than 0.2% by weight of a water-soluble content with a surface treating agent by a wet process. The toner composition is excellent in chargeability, environmental stability of charging, toner admixing properties, and durability. The toner composition hardly adheres to a contact charging member and, even if it does, it causes no reduction in charging performance of the contact charging member and provides a satisfactory image.