Abstract: Solder is connected to the electrodes of the circuit board by using a temperature profile with a constant fusion temperature, a connection interface strength evaluation test is carried out on the soldered joints to obtain an appropriate reflow range free of decreases in the strength at the connection interface. On the basis of the appropriate reflow range obtained and using as the basis the chemical compound thickness which is determined uniquely by heat load, an appropriate reflow range in an optional temperature profile with one temperature peak is obtained. By carrying out connection in this appropriate reflow range, soldered joints can be obtained without decreases in the connection interface strength in the large-scale production stage.

Abstract: An optical component of the present invention is compensated its optical dispersion, including third order dispersion, at low loss using optical dispersion compensating element comprising multi-layer film. In the optical component, an optical dispersion compensating element and a functional element are connected in series along an optical path.

Abstract: The present invention provides a method for removing solder adhering to an LSI. In this method, a plate-shaped first member for causing molten solder to adhere thereto is mounted on top of a heater. An LSI is placed on top of the first member with the surface on which solder is attached facing downward. A second member for adding a load to the LSI is placed on top of the LSI. The heater is heated up to heat the first member and the LSI, and to melt the solder. The molten solder is transferred to the first member. A suction mechanism is positioned at a location a predetermined distance away from the top surface of the second member. The second member and the LSI are attracted by the suction mechanism, and the LSI is pulled away from the first member. The solder is thereby removed from the LSI.

Abstract: A waste gas stream containing toxic NF.sub.3 and optionally other gases, such as acidic fluoride gases, for example, HF, SiF.sub.4, MoF.sub.6 and WF.sub.6 is first treated with particles or ribbons of a Cr-containing Fe alloy at about 300-600.degree. C. to remove the NF.sub.

Abstract: A waste gas stream containing toxic NF.sub.3 and optionally other gases, such as acidic fluoride gases, for example, HF, SiF.sub.4, MoF.sub.6 and WF.sub.6 is first treated with particles or ribbons of a Cr-containing Fe alloy at about 300.degree.-600.degree. C. to remove the NF.sub.3 content and, if desired, subsequently with an alkaline neutralizing agent in the form of pellets to remove the acidic fluoride contents, if any; said alloy containing preferably about 16-26% Cr and being used in a form of bed packed with said ribbons.

Abstract: In a semiconductor strain detector, the temperature characteristic of the output of a zero-point temperature compensating circuit is added to the zero-point temperature characteristic of the output of a bridge circuit composed of strain gauges, to perform a zero-point temperature compensation of the final output. Further, two kinds of diffusion resistors having different surface impurity densities are used in each amplifying circuit to perform a sensitivity-temperature compensation in which a temperature coefficient of sensitivity is considered up to the second-order term.

Abstract: The present invention provides a process for preparing a 1,1-disubstituted ethylene derivative of the formula ##STR1## which comprises reacting lead with a carbinol derivative of the formula ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, X, Y, m and n are defined in the specification. The reaction is conducted more advantageously in the presence of a metal having higher ionization tendency than lead.

Abstract: An AT-cut quartz resonator is disclosed, wherein the length l, the width w and the thickness t of the quartz crystal plate are respectively chosen in the directions of an electrical axis (X-axis), an optical axis (Z'-axis) and a mechanical axis (Y'-axis), the width-to-thickness ratio w/t is chosen in the range of 2.0 to 2.8 and the length-to-thickness ratio l/t is chosen less than 25. Consequently, an AT-cut quartz resonator of miniature size having high Q-values of the major mode and excellent frequency-temperature characteristics of the vibration frequency is realized.

Abstract: A rectangular AT-cut quartz resonator comprising a quartz crystal plate rotated about 35.degree. around the X-axis, has dimensional ratios w/t and l/t respectively in the range of 3.1 to 3.7 and 14.5 to 16.2, where the length l, width w and thickness t are respectively along the X-axis, Z-axis, and Y-axis.

Abstract: A portable electronic timepiece includes an electronic time-keeping device for developing electric time signals suitable for use as a time standard. The timepiece is equipped with a television receiver for receiving telecast TV signals and develops therefrom electric video signals representative of the video information contained in the telecast signals. Both the time signals and the video signals are applied through drive circuitry to a matrix indicator comprised of a plurality of longitudinal electrodes and a plurality of row electrodes. A switching circuit selectively applies the time or video signals to the matrix indicator for effecting display of either a time image or a video image.

Abstract: An oscillator for producing an output signal having a predetermined frequency for use in an electronic timepiece. The oscillator comprises a miniature crystal vibrator having a high resonant frequency, a case housing the crystal vibrator, an integrated circuit comprising an oscillator circuit with the crystal vibrator, and a trimmer condenser for adjusting the high resonant frequency. The trimmer condenser is formed on an external recess portion of said case, and is connected with the crystal vibrator and integrated circuit by a circuit having low stray capacitances. The oscillator is therefor highly insensitive to external electric fields.

Abstract: A portable electric generating device particularly for an electronic timepiece comprises an oscillatable weight rotatably supported for rotation in either direction by changes in position of the device, rotation converting means for converting oscillation of the oscillatable weight into rotation in one direction and a rotatably energy storing wheel comprising a hub portion driven by the rotation converting means, a coaxial rim portion having on its periphery a plurality of circumferentially spaced teeth and springs connecting the hub portion with the rim portion. A pallet engageable with the teeth restrains rotation of the rim portion of the energy storing wheel until predetermined energy has been stored in the springs whereupon the rim portion of the energy storing wheel is rotated by the springs until again stopped by the pallet. Operation of the pallet is controlled by a cam wheel driven by the rotation converting means.

Abstract: A portable electronic timepiece comprises time keeping circuitry, television receiver circuitry and an indicator grid which can selectively visually display a time signal or a television image either wholly or partially in magnified form. Switching means is provided for selecting between display of the time signal and display of the television image and for selecting a portion of the television image to be magnified and displayed. Means is provided for indicating on the normal video picture the position of the portion selected for enlargement and display.

Abstract: A thickness-shear crystal vibrator having a pair of driving electrodes on a pair of opposed planar surfaces. A pair of side surfaces adjacent the opposed surfaces has a pair of electrode leads disposed thereon which extend from the driving electrodes to the thickness center line or shear vibration modal line of the vibrator. The electrode leads are formed to extend over a bevel cut at the edge portion of the opposed side planar surfaces and ends of the electrode leads are both connected to a respective conductive supporting member.