A quartz surface is bonded to a metallic surface such as stainless steel. The method involves the sequential vacuum evaporation of chromium, copper and chromium, and copper onto the quartz surface to form in superposition, a chromium film, a copper-chromium film, and a copper film in that order on the quartz surface. The quartz surface bearing these superimposed films is then placed in electrical and physical contact with the stainless steel surface to which it is to be bonded and immersed in an...

Starting from pegmatitic sand, the invention provides a method of purifying quartz sand, in which the amount of iron is reduced to less than 0.3 ppm, the amount of zircon to less than 1 ppm, and the amount of phosphor to less than 0.2 ppm. Gas nuclei are also removed. The method is carried out by washing with solution which contains at least 15% by weight of HF in water until at least 40% by weight of the quartz sand is dissolved, and washing with a solution which contains at least 20% by weight...

Unique cristobalite-seeded quartz glass crucibles and cores admirably suited for Cz crystal growing and D.S. metal casting are formed by slip casting using a slurry containing a quartz refractory composition comprising silica particles with an average particle size of from 1 to 10 microns and a minute but effective amount of micronized dispersible particles of a unique crystallization aid, such as basic aluminum acetate, which provides the glass with at least 0.005 percent by weight of evenly di...

A pair of identical quartz elements each having a end wall and a sidewall are disposed in an opening through an outer quartz member so that the end walls are opposed and spaced from each other. A portion of the sidewalls of each element are secured to the outer member to define an inner space between the elements and the outer member. Capacitor plates are formed on the opposed surfaces of the end walls to form a capacitor. Each plate has a conductor connected thereto which extends through a seal...

A device for driving an electro-mechanical transducer of a timepiece from a quartz crystal oscillator including a switching circuit formed with an active element having an insulated gate type transistor and a bipolar type transistor. The electro-mechanical transducer is driven from said bipolar type transistor, which in turn is controlled and switched by the saturation current flowing through said insulated gate type transistor.

A torsional quartz crystal resonator has a specific cut type resulting in improved frequency temperature behavior. The cut type is defined by rotating a Z plate quartz crystal around an x-axis at an angle .phi. in the range of 0.degree. through 30.degree. and by further rotating the plate around a z'-axis at another angle .theta. in the range of -20.degree. through -10.degree. or +10.degree. through +20.degree.. The resonator has a thickness z.sub.0 and a width x.sub.0 determined such that a thi...

A quartz crystal watch comprising a quartz crystal oscillator for generating relatively high frequency signals, a frequency divider circuit for reducing and converting the frequency of the oscillated signals from said oscillator to predetermined frequencies of clock pulse, a pulse width converter for reducing the pulse width of output pulse signals from said frequency divider circuit, a motion transducer for converting the amplified output signals from the amplifier pulse width converter to the ...

Quartz sections having a surface condition as polished as possible are prepared by controlled dissolution by placing said quartz sections in a bath of a quartz solvent or a mixture of solvents, wherein the bath is basic and comprises an alkaline hydroxide or fluoride, or ammonium hydroxide, or a mixture of these compounds; and conducting controlled dissolution of the quartz sections at atmospheric pressure.

A system that provides an accurate frequency generating source, avoids mode coupling of the quartz vibrator, and has a high production efficiency. A high frequency amplifying circuit uses a bridge circuit as part of a feed back circuit, and a quartz vibrator is inserted in a branch side connecting the CR-circuit. The oscillation frequency is less than the serial resonance frequency of the quartz vibrator. The vibration energy is enclosed between the electrodes which prevents energy scattering to...

An inner surface of a quartz crucible after being used is cleaned by an acid liquid, and an extraneous material adhered to its inner surface is removed. The inner surface after the extraneous material has been removed is heat treated at 1600.degree. C. or more, and the inner surface where cristobalite formation occurs is recovered into an amorphous state. In this manner, the quartz crucible after being used for growing single crystal silicon is reproduced to a level equal to a new crucible.