A socket for a semiconductor device having solder balls includes a circuit substrate, an interposing sheet and a holder. The circuit substrate has conductive bumps on one side thereof corresponding to the solder balls, respectively. The interposing sheet has interposing electrodes through the interposing sheet corresponding to the solder balls, respectively. The diameter of each interposing electrode is greater than that of each solder ball. The holder holds the semiconductor device on the circu...

Indentations provided on the periphery of the balance wheel of a time piece are engageable by a starting spring carried on one end of a starting lever actuated by a push-pull movement of the winding stem to stop the time piece with the balance wheel angularly displaced from neutral position. Preferably two indented portions are provided at diametrically opposite sides of the balance wheel.

Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The present i...

An encoder for suppression of a consecutive identical digit in a digital transmission system has been found for facilitating the reproduction of a clock signal for regenerating reception data, and keeping the average signal level constant. According to the present invention, a single bit (x) is inserted for every predetermined number (m) of input digits, and said insertion bit is a complement of a digit of previous k bits where k is an integer satisfying 1.ltoreq.k.ltoreq.m. Preferably, the valu...

In a printing device capable of exchanging a plurality of printing elements which correspond to a plurality of character sets, respectively, at least two of the character sets having common character data, the device sequentially receives text data including character data, and identification code data for identifying one of the character sets, the identification code data being put prior to the succeeding character data for indicating the character set used in preparing the succeeding character...

The ink-jet recording apparatus has an ink passage into which a water based ink or a preservation solution is filled. The ink passage is formed from a rubber employing organic peroxide and zinc oxide as a vulcanization agent. The ink has a dynamic surface tension at a lifetime of 100 ms of about 35 mN/m to about 45 mN/m as measured by means of a maximum bubble pressure method at a measurement temperature of 25.degree. C. The preservation solution has a dynamic surface tension at a lifetime of 10...

It is to provide a high-frequency component using a small coupling line, capable of easily adjusting an electrical characteristic. A first transmission line including three line sections constructs a 1/4-wavelength strip line. A second transmission line including three line sections also constructs a 1/4-wavelength strip line. The line section on one-end side in the first transmission line is faced to the line section on one-end side in the second transmission line, while a dielectric sheet is d...

A chloroprene polymer is produced by aqueous emulsion polymerization in the presence of a cyclic polysulfide compound which is employed in a quantity equal to at least 0.1% by weight of the weight of the chloroprene, followed by deflocculating the polymer.

An improved device for supporting a spindle of an open-end spinning apparatus is provided with a ring shaped resiliently yieldable member rigidly disposed in a space between a bearing supporting the spindle and an inside cylindrical wall of a bushing member, and an additional ring shaped member rigidly disposed in the above-mentioned space separately from the resiliently yieldable member. To prevent accumulation of heat in the spindle, a plurality of grooves are formed on the peripheral surface ...

An angle detection apparatus includes a rotation member including at least one north magnetic polar region and at least one south magnetic polar region alternately arranged around a rotation center, a magnetic field detecting portion having a magnetic plate and detecting elements detecting magnitudes of magnetic components in a direction perpendicular to the magnetic plate, and a computing unit determining a rotation angle of the rotation member, wherein the magnetic field detecting portion is d...