JPS641124A - Optical head - Google Patents

Optical head

Info

Publication number
JPS641124A
JPS641124A JP62155206A JP15520687A JPS641124A JP S641124 A JPS641124 A JP S641124A JP 62155206 A JP62155206 A JP 62155206A JP 15520687 A JP15520687 A JP 15520687A JP S641124 A JPS641124 A JP S641124A
Authority
JP
Japan
Prior art keywords
outputs
semiconductor
objective lens
detection element
position detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62155206A
Other languages
English (en)
Other versions
JPH011124A (ja
Inventor
Masafumi Hikasa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP62155206A priority Critical patent/JPS641124A/ja
Publication of JPH011124A publication Critical patent/JPH011124A/ja
Publication of JPS641124A publication Critical patent/JPS641124A/ja
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
JP62155206A 1987-06-22 1987-06-22 Optical head Pending JPS641124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62155206A JPS641124A (en) 1987-06-22 1987-06-22 Optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62155206A JPS641124A (en) 1987-06-22 1987-06-22 Optical head

Publications (2)

Publication Number Publication Date
JPH011124A JPH011124A (ja) 1989-01-05
JPS641124A true JPS641124A (en) 1989-01-05

Family

ID=15600823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62155206A Pending JPS641124A (en) 1987-06-22 1987-06-22 Optical head

Country Status (1)

Country Link
JP (1) JPS641124A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5250636A (en) * 1990-04-25 1993-10-05 Kureha Kagaku Kogyo K.K. Poly(arylene thioether-ketone-ketone) copolymer and production process thereof
JP2007285530A (ja) * 1994-08-15 2007-11-01 Van Doornes Transmissie Bv 無断変速機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5250636A (en) * 1990-04-25 1993-10-05 Kureha Kagaku Kogyo K.K. Poly(arylene thioether-ketone-ketone) copolymer and production process thereof
JP2007285530A (ja) * 1994-08-15 2007-11-01 Van Doornes Transmissie Bv 無断変速機
JP4693819B2 (ja) * 1994-08-15 2011-06-01 バン・ドールネズ・トランスミツシー・ベー・ブイ 無断変速機

Similar Documents

Publication Publication Date Title
JPS52109954A (en) Optical signal reader
ATE141435T1 (de) Optische abtastvorrichtung
MY113350A (en) Semiconductor laser device to detect a divided reflected light beam
EP0285661A4 (en) POSITION DETECTOR OF THE OPTICAL FOCUS OF AN OPTICAL DATA STORAGE / READING DEVICE.
NO173033C (no) Optikk for maaling av krummingsvariasjon
JPS56117326A (en) Rotary head type magnetic recording and reproducing device
CA2002381A1 (en) Optical pickup device
JPS641124A (en) Optical head
JPS55125417A (en) Photodetector
EP0373607A3 (en) Focusing error detection circuit
KR900000856A (ko) 광학 헤드장치
JPS5644821A (en) Measuring method of optical lens focal distance and measuring system therefor
JPS5644128A (en) Optical pickup
JPS6123572B2 (ja)
JPS6479943A (en) Optical head device
JPS5574403A (en) Light position detector
SU1746339A1 (ru) Визир устройства контрол направлени движени объектов
JPS55125545A (en) Optical information recorder/reproducer
SU1193457A1 (ru) Устройство дл измерени переходной характеристики лазерного приемника сигналов акустической эмиссии
SU1462098A1 (ru) Дифференциальный интерферометр дл изменени угловых перемещений
SU1587327A1 (ru) Интерферометр
JPS57198547A (en) Optical information processor
JPS57103008A (en) Optical position detector
JPS5570942A (en) Tracking error detector
JPH0211513U (ja)