摘要:
The periphery of an area of a master pattern is expanded by a required number of pixels to define a plurality of master pattern areas two-dimensionally misregistered pixel by pixel, for performing pattern comparison of the respective master pattern areas with an area of an object pattern. The object pattern is deemed defective when all of the comparisons indicate pattern mismatches. The pattern is deemed not defective when at least one comparison indicates a pattern match. Thus, even if an inspected object includes misregistration errors, pattern defects can be detected with high accuracy.
摘要:
Printed wiring boards (PWBs) applied to this inspection system are previously formed with marks in prescribed positional relation to wiring patterns. Deviation of PWBs with respect to absolute coordinates of the inspection system is detected by reading the marks. The PWBs are sequentially set one by one on a movable table, to be subjected to image acquisition of the marks and inspected areas. A first PWB is image-acquisited whereby obtained binary image data of the inspected area are stored in a memory unit. Thereafter a second PWB is image-acquisited, and in advance to the image acquisition of its inspected area, relative misregistration of the both PWBs is found by deviation data on respective marks of the first and second PWBs. The binary image data of the first PWB is read from the memory unit on the basis of the binary image data of the second PWB. When the binary image data of the first PWB are read, positional correction, i.e., time base correction is performed on the read data to correspond to pixels of the second PWB under image acquisition on the basis of data on the previously found amount of relative misregistration. The data on corresponding pixels of the both PWBs are compared with each other thereby to inspect difference between the patterns of the PWBs on the basis of the result of the comparison.
摘要:
A binarized image data group of an inspected object for a plurality of pixels arrayed in the sub-scanning direction is sequentially created in order along the main scanning direction to determine whether or not the pattern of an inputted image corresponds to a standard through-hole pattern on the basis of the binarized image data group. When the determination is of yes, through-hole diameter masking data are sequentially created in order along the main scanning direction to sequentially perform masking processing on the binarized image data group of the inspected object arrayed in the sub-scanning direction. Thus, the through-hole pattern is automatically detected to be subjected to masking processing, whereby an inspected object having through-holes can be inspected by a pattern matching method.
摘要:
Disclosed herein is an image pickup apparatus for a printed wiring board comprising a solid state image sensor whose light receiving surface is set to be opposed to the surface of the printed wiring board, a main illumination source arranged to satisfy the law of regular reflection on the surface of the printed wiring board with respect to the light receiving surface of the solid state image sensor and a subsidiary illumination source arranged not to satisfy the law of regular reflection with respect to the light receiving surface of the solid state image sensor thereby to supply the light receiving surface with scattering light by strias formed on copper patterns. The amount of regularly reflected light, which is changed depending on the strias formed on the copper patterns, is substantially compensated by the scattering light, so that the amounts of light received by the solid state image sensor relating to the copper patterns are made substantially constant regardless of the radiation pattern of the strias. In addition, the main and subsidiary illumination sources are formed by light emitting diodes thereby to attain technical and economical advantages.
摘要:
An apparatus for tracing and recording image lines includes a coordinate reader which detects coordinate values of an image to be traced; an image sensor which is movable in a plane relative to a table; a memory in which image signals detected by means of the sensor are written; and a central processing unit which controls the above elements of the apparatus. Trace data are obtained by means of the coordinate reader which detects coordinate values of the image lines. Then, the image is positioned on the table, where record data are obtained based on the trace data by means of the image sensor which generates image signals corresponding exactly to the image.
摘要:
A method for tracing an object such as an outline of a picture or a line image, wherein the object is sensed by a set of sensing elements arranged in an optical head moving along the object, to detect a position and a direction of the object, wherein the optical head is controlled to trace the object depending on the detected position and the direction of the object, and wherein the object is reproduced by reproduction means which is moved in synchronization with the optical head. Present invention improves this method by moving the optical head along portions of the object, which the sensing elements can discriminate hardly or not at all nor follow the object, according to line segment data which is predetermined and represent a plurality of points of coordinates.
摘要:
A cleaning device for an intermediate transferring member, comprising: a first cleaning roller that is placed so as to rotate while being made in contact with a surface of the intermediate transferring member; a first bias-applying device that applies a bias voltage to the first cleaning roller; a second cleaning roller that is placed so as to rotate while being made in contact with the surface of the intermediate transferring member on a downstream side from the first cleaning roller in a surface-moving direction of the intermediate transferring member; and a second bias-applying device that applies a bias voltage having a polarity different from that of the bias voltage applied by the first bias-applying device to the second cleaning roller, wherein the first cleaning roller is a brush roller, and the second cleaning roller is a foam roller having a foam layer on a surface thereof, with a cell wall face in the foam layer having an opening ratio in a range of 3% or more to 50% or less, and an image-forming apparatus equipped with said cleaning device for an intermediate transferring member.
摘要:
An electronic apparatus that includes a circuit substrate being installed in a casing. The electronic apparatus has first and second groove portions that are formed on a first surface and a second surface of a heat sink, respectively. The heat sink discharges heat from a heat element on the circuit substrate to the outside of the casing. The electronic apparatus has a through-hole portion that is formed at an intersection point of the first groove portion formed on the first surface of the heat sink and the second groove portion formed on the second surface of the heat sink.
摘要:
An electronic apparatus includes a chassis and a heat sink. The heat sink configures one of side walls of the chassis. The heat sink has inner and outer wall surfaces corresponding to inner and outer surfaces of the chassis. The heat sink has a guide portion guiding a drop of water adhered to the heat sink to the outer wall side.
摘要:
A developing device has a developer bearing member, a housing adapted to accommodate a developer, and a supply roller adapted to supply the developer within the housing for the developer bearing member. The supply roller has an outer circumferencial foam layer made of resin or rubber. The foam layer has an air permeability of 150-200 ml/cm2/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.
摘要翻译:显影装置具有显影剂承载构件,适于容纳显影剂的壳体和适于将显影剂供应到用于显影剂承载构件的壳体内的供应辊。 供料辊具有由树脂或橡胶制成的外周边泡沫层。 泡沫层的透气度为150-200ml / cm 2 / s,硬度为50-200N,平均泡孔密度为25-40个/ 25mm宽。