Abstract: The illustrated receiver 6, in flip-flops 16A-D, stores four sequential samples of a biphase-L signal A1 and shifts the samples into four shift registers 24A-D. The sampled signals are clocked through their respective shift registers 24A-D by selected phases of multiphase clock .phi..sub.1, .phi..sub.2, .phi..sub.3, .phi..sub.4. Thus, each set of four samples is stationary at some location in their respective shift registers for the same clock cycle. A decoder section 10 responds to a transition between adjacent signal levels at the output of the shift registers 24A-D and to a previously sampled signal level A44. The decoder section 10 generates a control signal A32-D32 indicating the detection of a mid-bit biphase-L signal transition. A second storage means responds to the control signal A32-D32 and stores a shift register 24A-D signal level A19, B20-D20 which occurred subsequent to the detected mid-cell transition.

Abstract: An adjustable time delay circuit 10, 50 includes a time delay line 12 including a plurality of series connected time delay units 18a-p. During adjustment, sampled signals along the delay line 12 are compared with a reference signal by NOR-gates 22e-m. Upon a comparison being attained, the output of the corresponding NOR-gate 22e-m sets a selected flip-flop 30e-m which in turn routes the signal at a selected delay line tap 38e-m through a NOR-gate 34e-m to an output OR-gate 40. The tap 38e-m selected, compensates for component propagation characteristics thus maintaining a predetermined time delay through the time delay circuit 10.

Abstract: A paper transport apparatus is illustrated which strips a single sheet of paper 16 from a stack 18 using a stripping roller 20 and cooperating fingers 22. The sheet of paper 16 is directed between the nip of a pressure roller 26 and a transfer roller 28. The transfer roller 28 is mounted on a drive mechanism 30 and is selectively positioned against a transfer drum 40 carrying an ink pattern by a cam 66, follower 72 and a spring 60 combination. The paper 16 is driven by the transfer roller 28 in contact with the drum 40 and discharged along a shelf 52 guided by a belt 50.

Abstract: A digital receiver (40) includes a differential amplifier (42) providing data signal E and a control signal F. The level of the control signal F is related to the average level of the data signal E. A slicing circuit 44 includes series connected transistors (46, 48), the gates of which receive the data signal E. A third transistor (52) is connected to provide hysteresis to the slicing circuit, and a fifth transistor (54) is connected in parallel with the third transistor (52). The control electrode of the transistor (52) receives the control signal F from the differential amplifier (42).

Abstract: A method of manufacturing a thermal print head includes the step of coating a channel 12 of a fixture 10 with a first adhesive 26. Integrated circuit packages 20 are placed in the channel 12 with heating elements 22 disposed toward the bottom 14 of the channel 12. The packages 20 are held in position by a jig 30 while the adhesive 26 is thermally activated. A groove 52 in the face of a heat sink 50 is filled with a first part 54 of a two part adhesive and the integrated circuit packages 20 coated with the second part 56 of the two part adhesive. The alignment fixture 10 is positioned over the heat sink 50 activating the two part adhesive. The temperature of the assembly is elevated causing the first adhesive 26 to release and the second adhesive 54, 56 to further cure thus securing the packages 20 to the heat sink 50. Printed circuit cables 60, 70 are soldered to the packages 20.

Abstract: A receiver for a biphase-L signal A is described which includes a line-up detector 14 generating a circuit initialization pulse. A preamble detector 40 is responsive to a preamble of the incoming biphase-L signal A. A sampling signal generator 17 is responsive to the signal from the preamble detector 40, to the biphase-L signal A and to a second control signal. The output C of a time delay line 34 supplies the second control signal, and the input to the delay line 34 is supplied by the sampling signal generator 17. The output data signal H is generated by a flip-flop 54 which samples the biphase-L signal A at times determined by the output G of the sampling signal generator 17.

Abstract: A thermal print head 10 with a support surface 12 having first and second intersecting axes 14, and 16 is shown. A logic unit in the form of a shift register 50 and driver transistor 20 controlled by the shift register 50 are along the second axis 16. A heater resistor 22 is also positioned along the first axis 14 adjacent an end of the driver transistor 20. Spaced first and second power busses are 24, 32 are positioned parallel to the second axis 16 and are connected to the heater resistor 22 and the driver transistor 20. A plurality of parallel conductors 40 are parallel to the second axis 16 and supply address and gate signals to the shift register 50.

Abstract: The illustrated ink jet (19) includes a chamber (22) containing a quantity of ink (54) discharged through a nozzle orifice (28) in the form of droplets (84). The ink is discharged in response to movement of an actuator positioned over a chamber (22) opening. The actuator (50) includes a piezoceramic plate (60), the surfaces of which are covered by electrodes (62, 64). Soldered to the electrode (62) is a bending plate (56) which is secured by adhesive (58) to a flexible sheet of insulating material (52). Control signals are fed through conductors (72, 59) to the electrodes (62, 64).

Abstract: A light sensor 10 includes two parallel, spaced mask plates 12, 14. A first mask plate 12 has nine, small, spaced holes 38a-i which are in alignment with corresponding holes 36a-i in the second mask plate 14. The light sensor 10 includes a base plate 18 having nine holes 22a-i into which photosensitive devices 26a-i are positioned and the base plate 18 is secured to the outer surface of the second mask plate 14. The photodiodes 26a-i are connected to an indicating means 32 which provides an indication of the light falling upon each photodiode 26a-i individually or upon all of the photodiodes 26a-i collectively.

Abstract: A cache memory 30 having a thirteen bit word length is illustrated for storing more than one data word read from a system memory 80 having an eight bit word length and providing the stored words to a video display 18 on a reoccurring basis. The cache memory 30 has a storage capacity sufficient to store the words for one row of display text characters. Two system memory bytes are concatenated by a latch 74 and storage buffer 96 prior to writing into the cache memory 30. After the scanning of the first word of the last scan line in the current cathode ray tube (19) display text row, the first word of the new text row is written into the cache memory (30) from the system memory (80). The write procedure is completed before the last word of the new text row is read from the cache memory 30 to the cathode ray tube display 19 during the writing of the first scan line of the new text row.

Abstract: An integrated circuit 14 having an active circuit 19 is formed on a circuit wafer 10. A moat 18 in the field oxide 20 surrounds the active circuit 19. Metallic conductor 30 passes from a location on the active circuit 19 over the moat 18 to a contact area 22. The wafer 10 is covered with a photoshaped silicon nitride layer 18, and a support wafer 40 is secured with adhesive 46 to the circuit side of the circuit wafer 10. The circuit wafer 10 is photoshaped to expose the metallic conductor 30 at the contact area 22, and the contact area 22 is prepared with multiple metal layers 62, 66, 70 for connection to external wiring.

Abstract: A method for manufacturing an integrated circuit thermal print head is illustrated including transistor 20 and a resistor doped region 22 formed on a first surface of a silicon circuit wafer 10. A contamination barrier in the form of a moat 26 filled with silicon nitride 30 is formed around the transistor 20. A support wafer 50 is secured to the first surface of the circuit wafer 10 by an adhesive layer 58. The circuit wafer 10 is thinned, and the exposed surface of the circuit wafer 10 is photoshaped to define wafer segments 68 positioned over the resistor doped region 22.

Abstract: A method for manufacturing an integrated circuit device illustrates the preparation of the first surface of a circuit wafer including the placement of fine alignment indicia 34a outside the active chip area. A support wafer 50 is secured to the first surface of the circuit wafer 10 by an adhesive layer 58. The circuit wafer 10 is thinned. Openings 66 are photoshaped in the circuit wafer 10 using wafer flats 51 for alignment. The openings expose alignment indicia 34a which are relief images in the adhesive of the alignment pattern 34. The exposed surface of the circuit wafer 10 is photoshaped, using the indicia 34a for alignment, to define wafer segments 68 positioned over resistor doped regions 22.

Abstract: A facsimile document scanner 10 is illustrated which includes an optical system 23 having a folded optical path 40 and an adjustable lens system 42. A test pattern 60 in the form of a plurality of alternate light and dark stripes 64, 66 is focused upon a linear photodiode array 50 mounted in an integratd circuit pack 51. The number of light and dark stripes 64, 66 is equal to the number of photodiodes in the linear photodiode array 50 across the document width. For adjustment purposes, an oscilloscope 70 is connected to a serial output from the integrated circuit pack 50 and the position of the lens system along the optical path 42 is adjusted and a corresponding adjustment is made to the pointer of the lens holder 45 within the lens housing 43 to obtain the desired image size and focus. The position of the diode array 50 is adjusted with respect to the focused image 72, 74 to obtain the maximum display amplitude.

Abstract: A print hammer mechanism 10 includes a plurality of parallel print hammers positioned for sliding movement within slots 20a-i, 22a-i in the walls 16, 18 of a frame 12. The selective energization of one of a plurality of magnets 61a-i draws the corresponding hammer 30a-i against a rotating roller 52. The roller 52 drives the print hammer from a rest position to a print position. At the print position, a head 40a-i on the selected hammer 30a-i forces a paper medium against a type die 64 with an ink ribbon 62 interposed. Return movement is provided by a coil spring 38a-i attached to the rearward end of the hammer 30a-i.

Abstract: A bracket 18 is illustrated for mounting a light source 24 on a facsimile document scanner 10. The bracket 18 includes a pair of end plates 20, 22 between which the light source 24 is supported. Opposing ends of each plate 20, 22 have hinge pins 30, 30a which engage "L" shaped cutouts 38, 38a in opposing hinge plates 36, 36a mounted on the scanner 10. The hinge pins 30, 30a are held in their respective cutouts 36, 36a by coil springs 60, 60a. The remaining ends of the end plates 20, 22 have lock pins 32, 32a which engage "L" shaped cutouts 42, 42a in lock plates 40, 40a mounted on the scanner 10. Lock clips 50, 50a serves to maintain the lock pins 32, 32a in their respective lock plate cutouts 42, 42a.

Abstract: A closing mechanism 30 for a cabinet cover 14 is described including a pair of elongated flat links 32, 34 joined for sliding pivotal engagement. The remaining end of a first link 34 is pivotally secured to the enclosure cover 14 and the remaining end of the second link 32 is pivotally secured to the cabinet base 12. The links, when in their aligned position, are selectively locked in position by a cooperating notch 44 and tab 56. An articulated biasing means 59 in the form of two articulated coil springs 60, 62 serves to bias the links 32, 34 toward their axially aligned positions thus urging the cover 14 to its open position. The coil springs 60, 62 are hooked together with the remaining end of the second coil spring 62 hooked to a lip 20 on the cabinet base 12 adjacent the cover hinge 16. The remaining end of the first coil spring 60 is hooked to the link 32.

Abstract: A facsimile document scanner 10 is illustrated which includes an optical system 23 having a folded optical path 40 and an adjustable focusing lens 42. A test pattern 60 in the form of a plurality of alternate light and dark stripes 64, 66 is printed upon a strip 62 secured to the inner wall of the cabinet 12. When the scanner is at rest, the test pattern 60 is focused upon a linear photodiode array 50 mounted in an integrated circuit pack 51. The number of light and dark stripes 64, 66 is equal to the number of photodiodes in the linear photodiode array 50 across the document width. For adjustment purposes, an oscilloscope 70 is connected to a serial output from the integrated circuit pack 50 and the optical system 23 is adjusted to obtain a uniform signal display 80.

Abstract: A connector clip 12 is shown having a "U" shaped body member 30 including a base 34 and two parallel, extending legs 32. The ends of each of the legs 32 define camming surfaces 42 and a socket retaining notch 44. The clip includes a pair of first spacing feet 47 positioned medially upon each leg 32 and a pair of second spacing feet 36 located at the ends of a base member 34. The feet 36, 47 serve to limit relative movement between the clip 12 and a plug 14 which holds the clip 12 to a circuit board 22. A pair of spaced fingers 48 together with the circuit board 22 and the facing surfaces of the legs 32 define an access opening which serves to align the socket 24 with a plug 14. The second embodiment of FIGS. 5 and 6 includes a pair of arms 50 which engage the circuit board 22 surface opposite the surface upon which the plug 14 is mounted. The arms 50 prevent relative movement between the clip 12 and the circuit board 22.

Abstract: Twenty-five capacitive keyswitches 16a-e are arranged in a matrix having five row conductors 12a-e and five column conductors 14a-e. A series of five pulses are fed to each row conductor 14a-e in succession through AND gates 41a-e controlled by a counter 34. Each time a row conductor 12a-e is pulsed, all of the column conductors 14a-e are scanned. When one of the column conductors 14a-e is scanned, the associated coupling transistor 54a-e is turned on and the associated discharge transistor 50a-e is turned off. The remaining coupling transistor 54a-e of the remaining columns 14a-e are off and the remaining discharge transistors 50a-e are on.