Abstract:
To provide a semiconductor package mounting method, with excellent work efficiency, wherein the direction of a semiconductor package can be verified by a simple method before mounting. One corner of a square shaped display section provided on the surface of a semiconductor package body is chamfered such that the chamfer dimensions are different from those of the other corners. If image recognition by a camera determines that this chamfered part is located correctly, the orientation of a semiconductor package is determined to be correct. On the other hand, if image recognition determines that it is not located correctly, the orientation of the semiconductor package is adjusted until it is correct.
Abstract:
A solder bump fabrication method and apparatus. First, a printed circuit board, having a plurality of devices, is provided. A material is formed on the printed circuit board, and it is disposed between pins of the devices to prevent the devices from short-circuiting due to the solder bumps. Then, the solder bumps are formed on the pins of the devices so that the devices are fixed on the printed circuit board. The printed circuit board is passed through an infrared oven to melt the solder bumps. The material separates the solder bumps attached to the pins of the devices so that the devices are prevented from short-circuiting.
Abstract:
A wiring board for a semiconductor package comprises a base substrate having first and second surfaces; a wiring layer consisting of necessary wiring patterns formed on at least one of the first and second surfaces; a plurality of semiconductor element mounting areas formed on the surface of the base substrate on which the wiring layer is formed; and individual patterns as position information provided for the respective semiconductor element mounting areas, the individual patterns having a particular shape for the respective semiconductor element mounting area. The individual patterns as position information are formed on peripheral regions of the respective semiconductor element mounting areas.
Abstract:
A data processing apparatus is disclosed for data processing an audio signal. The data processing apparatus comprises an input terminal (1) for receiving the audio signal, a 1-bit A/D converter (4) for A/D converting the audio signal so as to obtain a bitstream signal, a prediction unit (10) for carrying out a prediction step on the bitstream signal so as to obtain a predicted bitstream signal, a signal combination unit (42) for combining the bitstream signal and the predicted bitstream signal so as to obtain a residue bitstream signal, and an output terminal (14) for supplying the residual bitstream signal (FIG. 1). Further, a recording apparatus (FIG. 4) and a transmitter apparatus (FIG. 5) comprising the data processing apparatus are disclosed. Other data processing apparatuses can be found in the FIGS. 18, 19 and 20. In addition, another data processing apparatus (FIG. 7) for converting the residue bitstream signal into an audio signal is disclosed, as well as a reproducing apparatus (FIG. 9) and a receiver apparatus (FIG. 10) comprising the other data processing apparatus.
Abstract:
A solder bump fabrication method and apparatus. The method comprises following steps. First, a printed circuit board, having a plurality of devices, is provided. A material is formed on the printed circuit board, and it is disposed between pins of the devices so that the material prevents the devices from short-circuiting due to the solder bumps. Then, the solder bumps are formed on the pins of the devices so that the devices are fixed on the printed circuit board. The printed circuit board is passed through an infrared oven to melt the solder bumps. Finally, extra solder bumps other than those attached to the device pins are removed, and the material separates the solder bumps attached to the pins of the devices so that the devices are prevented from short circuiting. In addition, the apparatus is provided with a plurality of through holes corresponding to gaps between the pins on the printed circuit board. Thus, isolated portions are formed between the pins on the printed circuit while the characters are printed on the printed circuit board.
Abstract:
The object is to provide a printed board manufacturing apparatus, printed board manufacturing method and a printed board produced thereby, in which stepwise exposures of an original photomask can be performed with an improved production yield by taking into account identification markings. In a stepwise exposure apparatus nullAnull for performing the exposure step for a printed board substrate (2) in which an original mask (3) having an wiring pattern area (3a) and identification marking areas (3c1) to (3c3) around the wiring pattern area (3a) is exposed stepwise a plurality of times to the printed board substrate (2) while shifting successively the site to be exposed, original mask (3) is arranged to face the printed board substrate (2) surface to be exposed; an opaque masking element (4) is disposed on one side of the original mask (3) on the other side of which disposed is the printed board substrate (2); and the opaque masking element (4) selectively masks identification marking areas (3c1) to (3c3) of the original mask (3).
Abstract:
A technique is described for providing body coloration and colored indicia for indicating one or more characteristics of an integrated circuit device. Package body coloration is one source of information about device characteristics. Other indications relate to colored indicia. The colored indicia are relatively large and easily viewable from distances too great for printed text on the package body to be read comfortably. The indicia is (are) colored other than black or white. Among the visible indicia characteristics which can be used to convey information are: indicia color (or colors on multi-colored indicia), shape, size, orientation, and/or location. Among the various integrated circuit device characteristics which can be conveyed by the indicia characteristics are: device function, device speed, level of testing, degree of rad-hardness, location of reference pin, side, corner or surface, location and function of groups of pins carrying related signals, etc. In order to facilitate assembly, colored indicia matching those on the integrated circuit devices can be printed on a printed circuit board substrate at locations and in orientations on the printed circuit corresponding to the correct assembled positions of the integrated circuit devices. Colored areas can also be incorporated into semiconductor packages to control (alter, modify) the thermal characteristics of the package, particularly in order that thermal stresses on a die operating within the package can be reduced and equalized.
Abstract:
Improved printed wiring boards are disclosed, in which indications showing the types of electronic devices to be mounted on the printed wiring boards and other information are provided within the insulation cover coating and are protected from getting accidentally scraped off. Alignment marks are also well protected so that users can always rely on the alignment marks. The surfaces of the printed wiring boards are smooth and flat, which prevents stagnation trouble in a feeding operation of the printed wiring boards as well as helps provide a securer mounting of electronic devices. An improved wiring freedom is also provided.
Abstract:
A method for patterning a tape to which an integrated circuit may be bonded including providing a tape having a top layer of unexposed film which, when exposed in an interconnection pattern and developed, acts as a mask for processing a photoprocessable layer of the tape to provide conductive portions in an interconnection pattern on the tape.
Abstract:
In a method of manufacturing printed circuit boards by coating a flux preventive film for preventing a flux from rising on a component surface of an insulation board, the method of manufacturing printed circuit boards according to the present invention is characterized in that said method comprises the steps of printing white blank marks, white blank symbols and white blank letters corresponding to symbol marks, other symbols and letters on the component side surface of said insulation board before coating said flux preventive film, and then coating said flux preventive film of a transparent or translucent material on the printed surface.