公开(公告)号：US3424867A

公开(公告)日：1969-01-28

申请号：US3424867D

申请日：1965-05-03

Applicant: HEWLETT PACKARD CO

Inventor： MONNIER RICHARD E

IPC: G01R13/32 ,  H04N5/12 ,  H04L7/04

CPC classification number: H04N5/123 ,  G01R13/32

公开(公告)号：US3567860A

公开(公告)日：1971-03-02

申请号：US3567860D

申请日：1968-03-07

Applicant: HEWLETT PACKARD CO

Inventor： OLIVER BERNARD M ,  MONNIER RICHARD E ,  JUSTICE GREGORY

IPC: H04N5/10 ,  H04N5/12

CPC classification number: H04N5/10 ,  H04N5/126

Abstract: A sync stripper removes the picture signal from the composite video input signal leaving a composite synchronizing signal that includes horizontal and vertical sync pulses. An oscillator produces a periodic timing signal having a repetition rate equal to twice that of the horizontal sync pulses. This timing signal is supplied to a binary scaler to produce a synchronizing signal for periodically triggering a horizontal deflection circuit at a repetition rate equal to that of the horizontal sync pulses. A feedback circuit, responsive to this synchronizing signal and to the composite synchronizing signal, phase locks the oscillator to the composite synchronizing signal and maintains the repetition rate of the oscillator at twice that of the horizontal sync pulses. The timing signal is also supplied to a gate that is periodically enabled in response to the vertical sync pulses to provide a synchronizing signal for periodically triggering a vertical deflection circuit at a repetition rate equal to that of the vertical sync pulses.

公开(公告)号：US3631510A

公开(公告)日：1971-12-28

申请号：US3631510D

申请日：1970-05-28

Applicant: HEWLETT PACKARD CO

Inventor： MONNIER RICHARD E

IPC: B41J2/425 ,  G01D15/06

CPC classification number: B41J2/425

Abstract: A paper printer employing a plurality of groups of print fingers arranged linearly across the paper, each group of fingers printing the rows of dots in a different character across the paper is disclosed. A plurality of voltage step-up transformers are used to energize the fingers, each transformer including a primary winding and a plurality of secondary windings. One primary winding is provided for each finger of a group, and different ones of the secondary windings of each transformer are coupled to one of the fingers in each group of fingers. Circuit means are provided for enabling all the secondary windings associated with a selected group of fingers and additional circuit means are provided for energizing one or more of the primary windings associated with the desired finger or fingers in the group. Those enabled secondary windings associated with the primary winding or windings selectively energized develop currents to be passed through the desired finger or fingers in the group to mark the paper.

公开(公告)号：US3392307A

公开(公告)日：1968-07-09

申请号：US44746165

申请日：1965-04-12

Applicant: HEWLETT PACKARD CO

Inventor： MONNIER RICHARD E

IPC: G01R13/32

CPC classification number: G01R13/32