Inventor
BIERHOFF MARTINUS P M
26 patents
⚠️ This page may combine multiple inventors who share the name “BIERHOFF MARTINUS P M”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PHILIPS CORP
25 patentsUS5103439AApr 7, 1992
Beam focus control system for optical record carrier scanning apparatus
PHILIPS CORP30 citations92
US4193091AMar 11, 1980
Optical videodisc read unit with tracking and focussing wobblers
PHILIPS CORP39 citations92
US4135206AJan 16, 1979
Objective mount for video disc player
PHILIPS CORP39 citations92
US4357696ANov 2, 1982
Optical scanning apparatus with focussing system
PHILIPS CORP20 citations81
US5097307AMar 17, 1992
Radiation sensitive semiconductor device for optical reading or writing unit
PHILIPS CORP7 citations74
US5036506AJul 30, 1991
Record carrier scanning apparatus with feedback control system for controlling scanning point position and velocity
PHILIPS CORP19 citations74
US4813031AMar 14, 1989
Apparatus for reproducing information from an optically readable record carrier
PHILIPS CORP20 citations74
US4628497ADec 9, 1986
Apparatus for reproducing information from an optically readable record carrier
PHILIPS CORP18 citations74
US4583209AApr 15, 1986
Apparatus for reproducing information from an optically readable record carrier
PHILIPS CORP13 citations74
US4568887AFeb 4, 1986
Apparatus for synchronizing the output frequency of a clock oscillator to a data signal
PHILIPS CORP10 citations74
US4482989ANov 13, 1984
Apparatus for optically scanning a disc-shaped record carrier
PHILIPS CORP14 citations74
US4471477ASep 11, 1984
Apparatus for optically scanning a disc-shaped record carrier
PHILIPS CORP15 citations74
US4354103AOct 12, 1982
Optical focusing device with two controls
PHILIPS CORP7 citations73
US4712091ADec 8, 1987
Digital/analog converter having a switchable reference current
PHILIPS CORP18 citations72
US4663749AMay 5, 1987
Apparatus for reproducing information from an optically readable record carrier
PHILIPS CORP14 citations72
US4740938AApr 26, 1988
Apparatus for rapid reproduction of information from a record carrier
PHILIPS CORP14 citations66
US4637006AJan 13, 1987
Apparatus for producing digital information from a transmission medium
PHILIPS CORP5 citations63
US5140282AAug 18, 1992
Current amplifier arrangement
PHILIPS CORP5 citations62
US5105249AApr 14, 1992
Radiation-sensitive semiconductor device having a transistor
PHILIPS CORP6 citations62
US4689501AAug 25, 1987
Signal level detector for compact disc player
PHILIPS CORP3 citations61
US4999828AMar 12, 1991
Record carrier decoder for multi-track data patterns including error protection data
PHILIPS CORP4 citations58
US4697258ASep 29, 1987
Apparatus for enabling an autotrack circuit of an optical disc reading apparatus during the positioning of a read beam
PHILIPS CORP5 citations58
US4683561AJul 28, 1987
Smooth lock-in of servo control when switched on
PHILIPS CORP3 citations54
US5708647AJan 13, 1998
Laser power supply circuit as well as option recording and/or reading device comprising such a laser power supply circuit
PHILIPS CORP1 citations51
US5099126AMar 24, 1992
Photosensitive semiconductor device having radiation sensitive diodes and photocurrent amplification
PHILIPS CORP0 citations51