Inventor
Akihiko Yoshizawa
Inventor
Yokohama, JP
Overview
Patents· 27 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H03Kprimary
H03KPulse technique24%
G11BInformation storage based on relative movement between record carrier and transducer22%
H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses22%
G02BOptical elements, systems or apparatus9%
G01NInvestigating or analysing materials by determining their chemical or physical properties7%
H03BGeneration of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner7%
B25JManipulators2%
G01RMeasuring electric variables2%
G06FElectric digital data processing2%
H03FAmplifiers2%
PatentTitleYear
10,940,593Robot apparatus20216,853,256'Voltage controlled oscillator with reference current generator'20056,784,719'Level shift circuit for transmitting signal from leading edge to trailing edge of input signal'20046,696,828'Integrated circuit and lot selection system therefor'20046,611,177'Voltage controlled oscillator including fluctuation transmitter for transmitting potential fluctuation by noise'20036,538,490'Offset compensation circuit and offset compensation method'20036,323,738'Voltage-controlled ring oscillator with level converting and amplitude control circuits'20016,259,290'Delay locked loop having a mis-lock detecting circuit'20016,246,271'Frequency multiplier capable of generating a multiple output without feedback control'20016,177,846'Ring oscillator type voltage controlled oscillator'20016,163,288'Digital-to-analog converter in which an analog output of low order bits is attenuated, and added to an analog output of high order bits'20006,011,444'Voltage controlled oscillator circuit'20006,005,420'Frequency multiplying circuit having a greater multiplying ratio'19995,955,902'Frequency multiplier using a voltage controlled delay circuit'19995,909,474'Phase-locked loop system'19995,898,167'Optical pick-up head and integrated type optical unit for use in optical pick-up head'19995,814,807'Optical pick-up head and integrated type optical unit for use in optical pick-up head'19985,804,814'Optical pick-up head and integrated type optical unit for use in optical pick-up head'19985,631,774'Polarizing beam splitter and optical pick-up head comprising the same'19975,594,391'N-stage ring connected voltage controlled oscillator'19975,566,142'Apparatus using an optical pickup'19965,432,760'Method of measuring phase difference of opto-magnetic record medium and apparatus for carrying out said method'19955,028,774'Method and apparatus for detecting and measuring the refractive index of an optical disc substrate'19914,841,510'Optical characteristic measuring apparatus for an optical recording medium substrate'19894,837,758'Magneto-optical recording reproducing device having field applying means'19894,792,227'Apparatus for measuring the refractive index of a substrate for an optical recording medium and method of measuring the same'19884,788,678'Optical information recording media substrate'1988Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1988–1999Patents assigned to OLYMPUS OPTICAL CO (10)· patent assignee history
1988–1998Based in Hachioji, JP· patent location history
1996Based in Suwa, JP· patent location history
1997–2005Patents assigned to TOSHIBA KK (15)· patent assignee history
1997–2021Based in Yokohama, JP· patent location history
1997–2004Based in Kanagawa, JP· patent location history
1999Based in Nishikamo-gun, JP· patent location history
2021Patents assigned to CANON KK (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| TOSHIBA KK | 15 | 1997–2005 |
| OLYMPUS OPTICAL CO | 10 | 1988–1999 |
| CANON KK | 1 | 2021 |
Locations
| Location | Patents | Span |
|---|---|---|
| Yokohama, JP | 15 | 1997–2021 |
| Hachioji, JP | 7 | 1988–1998 |
| Kanagawa, JP | 3 | 1997–2004 |
| Nishikamo-gun, JP | 1 | 1999 |
| Suwa, JP | 1 | 1996 |