Abstract: Each iron in a golf club set is made to have a more consistant distance spectrum across its club face. This is done by deadening its sweet spot area so that the distance achieved with an on center hit is less, thereby making a center hit and an off center hit more nearly the same. The consistency of the average golfer is thereby improved, leading to lower scores and more enjoyable sport. The "dead center" irons may have their face angles, or loft, reduced to increase overall distance in order to compensate for the reduced distance reaction of the center hit, in order that the irons of a specific type or number will retain their traditional distance reaction.

Abstract: An AC electric field emission suppressor for use in a CRT imaging system cancels the ripple voltage on the ultor voltage that generates the undesired emission. Ripple-cancelling pulses are derived from the horizontal deflection circuit and are capacitively coupled through the CRT wall to cancel the ripple voltage and suppress the undesired emission.

Abstract: In a horizontal drive circuit for a video display, means are provided for sensing the horizontal output pulse used to energize the high voltage sweep transformer and, in turn, the electrodes and deflection coils in a cathode ray tube (CRT). Horizontal output pulse height which represents not only the voltage applied to the CRT, but also retrace pulse duration is detected and utilized to terminate the video output when the horizontal pulse voltage level exceeds a predetermined value. Because this approach uses the collector pulse output of the horizontal output transistor to detect high voltage conditions, video shutdown during unsafe CRT operation is available not only for excessive peak voltage conditions, but also for improper retrace time operation due, for example, to sweep transformer malfunction.

Abstract: A unitary CRT display assembly comprises a chassis pan for supporting a printed circuit chassis and components from a CRT by means of an adjustable tension strap surrounding the periphery of the CRT faceplate or by a pair of mounting lugs coupled to the mounting ears of the CRT. The construction enables the chassis pan, CRT and components to be shipped, handled and readily assembled as a unit into a manufacturer's cabinet.

Abstract: A socket assembly for a CRT includes a socket mounted on a printed circuit board having a plurality of spark gaps interposed between an open grounding ring and the terminals of the socket. The spark gaps associated with the cathode and heater socket terminals have larger width dimensions than those associated with the other electrode terminals and are positioned adjacent to the portion of the open grounding ring farthest from the connection to the CRT "dag".

Abstract: Circuitry is described for driving the primary winding of a horizontal output transformer without the use of a conventional drive transformer. The horizontal output transistor is coupled to a tap on the output transformer and is switched off and on to excite the transformer. The horizontal output transistor is driven, in turn, by a driver transistor whose collector is also coupled to a tap on the output transformer such that adequate power is derived from the transformer to drive the output transistor into saturation. The driver transistor receives horizontal scan rate pulse from input circuitry which is preferably adapted to provide a path to ground for stored charges in the output transistor so that it may be rapidly turned fully off when a scan pulse terminates.

Abstract: A power supply for use in a computer terminal capable of providing a plurality of direct voltage signals to the computer terminal logic system while isolating this logic circuitry from the line voltage is disclosed. A high frequency power supply transformer and associated circuitry provides the various direct voltage signals to the computer terminal logic system and provides isolation between the line input and logic circuitry. Parallel isolation is provided by a horizontal sync coupling circuit which is driven by the logic system and which, in turn, synchronizes the horizontal deflection system. The direct voltage signals provided to the logic supply system are both scan- and pulse-derived from the horizontal sweep signal permitting various computer terminal systems to be operated by display-derived power output signals.

Abstract: Disclosed is a power supply having transformer isolation which is capable of providing a plurality of precisely regulated output voltage levels. This regulated power supply is particularly adapted for use in a video display terminal because the output voltages may be scan-derived for improved video presentation with a plurality of precise voltage levels for driving various terminal logic levels provided by a single DC signal source.

Abstract: Disclosed is a vertical drive circuit for a cathode ray tube in a video display in which sawtooth current waveform corrections for the deflection yoke are made by means of an S-correction feedback loop featuring DC-coupling and low frequency filtering. The amplified correction signal is transmitted to a push-pull type output stage for driving the deflection yoke. Power consumption is reduced and operation made more efficient by an approximate doubling of the retrace voltage applied to the push-pull output stage during retrace by means of a discharging capacitor network.

Abstract: A cathode ray tube (CRT) in a video display utilizes an anti-ringing system for minimizing beam scanning distortion at the start of trace. This distortion is due to velocity modulation of the scanning beam caused by high frequency, resonant energy in the inductances of the linearity and width coils and the electromagnetic deflection yoke, all of which are in series. The first half of beam scan cycle is accomplished by the conduction of the damper diode while operation of the horizontal output transistor provides beam deflection current for the second half of horizontal sweep. A low impedance is introduced in the circuit for a short period during the start of damper diode current conduction by means of a voltage biasing diode network. This low impedance dampens out high frequency resonant ringing without degrading video display performance by excessive resistive loading.

Abstract: Disclosed is a horizontal drive system and method for operating a video display capable of precisely controlling over a wide timing range the interval between the arrival of the leading edge of the input drive pulse and the initiation of the flyback pulse thus permitting the horizontal output to the video display to be synchronized to a great variety of horizontal drive input signals. The leading edge of the horizontal drive pulse triggers a variable time delay monostable multivibrator, the locked output signal of which is coupled to a precision astable multivibrator. Potentiometer adjustment of the monostable multivibrator provides for adjusting video information position with respect to raster scan while the astable multivibrator acts as the oscillator in synchronizing horizontal sweep circuitry to the horizontal input drive signal.