US3746912A — Method of and means for recording line drawings o…

Claim 1

Independent Claim 444 words

Apparatus for recording line drawings on the screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point with the end coordinate point, and means to produce difference voltages representing the difference between initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the individual coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point and the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, comparator means having an output and a pair of inputs for receiving respective horizontal and vertical difference signals and operable to provide a first signal at its said output when the horizontal difference voltage is less than the vertical difference voltage and a second signal at its said output when the horizontal difference voltage is greater than the vertical difference voltage, dividing amplifier means having a pair of inputs and an output and operable to provide at its said output the quotient of the voltage on a first of said pair of inputs divided by the voltage on a second of said pair of inputs, first switching means having a first input for receiving the horizontal difference voltages and a second input for receiving the vertical difference voltage, a pair of outputs connected to said pair of inputs of said dividing amplifier means, and a control input connected to said output of said comparator means and operable in response to said first and second signals to selectively connect said horizontal and vertical difference voltages to the input of said dividing amplifier means, and second switching means having a pair of inputs for receiving said sawtooth voltages, a pair of outputs connected to said deflection circuits and a control input connected to said comparator means and operable in response to said first and second signals to selectively connect said horizontal and vertical sawtooth voltages to the horizontal and vertical deflection circuits.

Claim 2

Dependent Claim 444 words

Apparatus for recording line drawings on the screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point with the end coordinate point, and means to produce difference voltages representing the difference between initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the individual coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point and the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, comparator means having an output and a pair of inputs for receiving respective horizontal and vertical difference signals and operable to provide a first signal at its said output when the horizontal difference voltage is less than the vertical difference voltage and a second signal at its said output when the horizontal difference voltage is greater than the vertical difference voltage, dividing amplifier means having a pair of inputs and an output and operable to provide at its said output the quotient of the voltage on a first of said pair of inputs divided by the voltage on a second of said pair of inputs, first switching means having a first input for receiving the horizontal difference voltages and a second input for receiving the vertical difference voltage, a pair of outputs connected to said pair of inputs of said dividing amplifier means, and a control input connected to said output of said comparator means and operable in response to said first and second signals to selectively connect said horizontal and vertical difference voltages to the input of said dividing amplifier means, and second switching means having a pair of inputs for receiving said sawtooth voltages, a pair of outputs connected to said deflection circuits and a control input connected to said comparator means and operable in response to said first and second signals to selectively connect said horizontal and vertical sawtooth voltages to the horizontal and vertical deflection circuits.

Claim 3

Dependent Claim 41 words

Apparatus according to claim 1, comprising function amplifier means connected between said output of said dividing means and said saw-tooth voltage generating means for selectively operating said sawtooth generating means in accordance with sin arc tg and cos arc tg functions.

Claim 4

Dependent Claim 62 words

Apparatus according to claim 1 comprising means for dividing said difference voltages by one another to provide quotients that are less than unity and means for forming sin arc tg and cos arc tg functions from said quotients, and wherein said sawtooth generator means is linearly responsive to said sin arc tg and cos arc tg functions to control the deflection circuits.

Claim 5

Dependent Claim 336 words

Apparatus for recording line drawings on a screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point to the end coordinate point, and means to prOduce difference voltages representing the difference between the initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the individual coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point and the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, a timing pulse generator for producing repetitive pulses, said sawtooth generating means including timing pulse input connections connected to said timing pulse generator, said sawtooth generating means being responsive to successive timing pulses to turn on and off, means for controlling beam current of the CRT including means for squaring said difference voltages, means for adding the squared voltages, means for extracting the square root of the added square voltages, and means for distoring the square root voltage connected to the recording beam emission circuit, means for adding the difference voltages, means for subtracting the difference voltages including means for rendering the subtraction effective without regard to sign, means for adding the sum and difference of said difference voltages connected to said means for distorting for distortion of said difference voltages.

Claim 6

Dependent Claim 336 words

Apparatus for recording line drawings on a screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point to the end coordinate point, and means to prOduce difference voltages representing the difference between the initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the individual coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point and the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, a timing pulse generator for producing repetitive pulses, said sawtooth generating means including timing pulse input connections connected to said timing pulse generator, said sawtooth generating means being responsive to successive timing pulses to turn on and off, means for controlling beam current of the CRT including means for squaring said difference voltages, means for adding the squared voltages, means for extracting the square root of the added square voltages, and means for distoring the square root voltage connected to the recording beam emission circuit, means for adding the difference voltages, means for subtracting the difference voltages including means for rendering the subtraction effective without regard to sign, means for adding the sum and difference of said difference voltages connected to said means for distorting for distortion of said difference voltages.

Claim 7

Dependent Claim 83 words

Apparatus according to claim 4 comprising at least one voltage divider connected to the output of said means for adding the difference voltages, a second means for subtracting connected to the first mentioned means for subtracting and to said voltage divider for subtracting to provide the absolute value difference between the voltages provided by said voltage divider and said first-mentioned means for subtracting, said second means for subtracting also connected to said means for adding the sum and difference of said difference voltages.

Claim 8

Dependent Claim 393 words

Apparatus for recording line drawings on the screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point with the end coordinate point, and means to produce difference voltages representing the difference between the initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the initial coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point to the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, two variable gain amplifier means each having an input for simultaneously receiving the difference voltages, a control input, and an output connected to said sawtooth generators, two function amplifiers, each of said function amplifiers including an input connected to the output of one of said variable gain amplifier meAns, said function amplifiers operable to square the output voltages of said variable gain amplifier means, an adjustable voltage source representing the desired value of the drawing speed of the recording beam between adjacent points of the drawing, and an adder circuit including an output connected to said gain control inputs of said variable gain amplifier means, and a plurality of inputs connected to said adjustable voltage source and said outputs of said function amplifier means for adding said squared output voltages and comparing such voltages with the voltage of said adjustable voltage source to provide control voltages to said variable gain amplifier means, whereby said variable gain amplifier means regulates the slope of a sawtooth voltage of said sawtooth generating means for each difference voltage with respect to both difference voltages and the voltage of the adjustable voltage source.

Claim 9

Dependent Claim 393 words

Apparatus for recording line drawings on the screen of a CRT which has horizontal and vertical deflection circuits, a horizontal and a vertical deflection coil, a recording beam emission circuit, the line drawings represented by a plurality of individually spaced coordinate points, each line drawing recorded by the recording beam connecting an initial coordinate point and an end coordinate point, means to produce deflection voltages representing the initial coordinate point, means to produce deflection voltages for connecting the initial coordinate point with the end coordinate point, and means to produce difference voltages representing the difference between the initial coordinate point and the end coordinate point comprising: adding means for adding the deflection voltages to the deflection coils, said adding means connected between the deflection coils and the means to produce the deflection voltages which represent the initial coordinate point and the means to produce the deflection voltages for connecting the initial coordinate point with the end coordinate point, sawtooth generating means producing constant slope sawtooth voltages which represent the deflection voltages for connecting the initial coordinate point to the end coordinate point, said slope being dependent upon the difference voltages derived from the initial coordinate point and the end coordinate point of the line drawing, two variable gain amplifier means each having an input for simultaneously receiving the difference voltages, a control input, and an output connected to said sawtooth generators, two function amplifiers, each of said function amplifiers including an input connected to the output of one of said variable gain amplifier meAns, said function amplifiers operable to square the output voltages of said variable gain amplifier means, an adjustable voltage source representing the desired value of the drawing speed of the recording beam between adjacent points of the drawing, and an adder circuit including an output connected to said gain control inputs of said variable gain amplifier means, and a plurality of inputs connected to said adjustable voltage source and said outputs of said function amplifier means for adding said squared output voltages and comparing such voltages with the voltage of said adjustable voltage source to provide control voltages to said variable gain amplifier means, whereby said variable gain amplifier means regulates the slope of a sawtooth voltage of said sawtooth generating means for each difference voltage with respect to both difference voltages and the voltage of the adjustable voltage source.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-07-16	1977-01-15	1977-07-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-07-16	1981-01-15	1981-07-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-07-16	1985-01-15	1985-07-17	$7700.00	Window Closed / Lapsed

Method of and means for recording line drawings on the screen of a cathode ray tube under computer control

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