JPH03225636A - Optical head device - Google Patents

Optical head device

Info

Publication number
JPH03225636A
JPH03225636A JP2019133A JP1913390A JPH03225636A JP H03225636 A JPH03225636 A JP H03225636A JP 2019133 A JP2019133 A JP 2019133A JP 1913390 A JP1913390 A JP 1913390A JP H03225636 A JPH03225636 A JP H03225636A
Authority
JP
Japan
Prior art keywords
light
diffraction grating
hologram
optical disk
diffract
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
JP2019133A
Other languages
Japanese (ja)
Inventor
Ryuichi Katayama
Akitomo Oba
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 JP2019133A priority Critical patent/JPH03225636A/en
Publication of JPH03225636A publication Critical patent/JPH03225636A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make a device small in size and light in weight and to enhance the utilization factor of light by providing a 1/4 wavelength plate between a diffraction grating and a hologram element which are constituted of double refraction diffraction grating type element and a recording medium and receiving diffracted light separated out of an optical axis.
CONSTITUTION: The diffraction grating 11 and the hologram element 5 are constituted of the double refraction diffraction grating type element and their crystal optical axes are set in parallel. The hologram element 5 is set so that it may hardly diffract radiated light 2 from a semiconductor laser 1 but mostly diffract returning light from an optical disk 8. Then, the diffraction grating 11 is set so that it may partially dif fract the radiated light 2 but hardly diffract the returning light from the optical disk 8. The radiated light 2 is converted to collimated light by a collimating lens 3, converted to circularly polarized light by a λ/4 plate 6, and converged on the optical disk 8 by a converging lens 4. The returning light from the optical disk 8 passes through a reverse path and the 1st order diffracted light of the hologram element 5 is made incident on a six-division photodetector 7 to detect an error signal and a recording signal, and it is made incident on a photodetector 12 to detect the record ing signal.
COPYRIGHT: (C)1991,JPO&Japio
JP2019133A 1990-01-31 1990-01-31 Optical head device Pending JPH03225636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019133A JPH03225636A (en) 1990-01-31 1990-01-31 Optical head device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019133A JPH03225636A (en) 1990-01-31 1990-01-31 Optical head device

Publications (1)

Publication Number Publication Date
JPH03225636A true JPH03225636A (en) 1991-10-04

Family

ID=11990968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019133A Pending JPH03225636A (en) 1990-01-31 1990-01-31 Optical head device

Country Status (1)

Country Link
JP (1) JPH03225636A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0863779A (en) * 1994-05-30 1996-03-08 Daewoo Electron Co Ltd Optical pickup device
JPH08249710A (en) * 1995-01-12 1996-09-27 Ricoh Co Ltd Optical head
JPH08273189A (en) * 1995-02-15 1996-10-18 Daewoo Electron Co Ltd Optical head of optical disk recording/reproducing apparatus
WO1999024852A1 (en) * 1997-10-16 1999-05-20 Matsushita Electric Industrial Co., Ltd. Hologram element polarization separating device, polarization illuminating device, and image display
US6385158B1 (en) 1997-10-29 2002-05-07 Sanyo Electric Co., Ltd. Optical pickup device having compatibility with tracking system, and optical disk recording/reproduction apparatus using the same
US6584060B1 (en) 1998-06-24 2003-06-24 Ricoh Company, Ltd. Optical pick-up device for recording/reading information on optical recording medium

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0863779A (en) * 1994-05-30 1996-03-08 Daewoo Electron Co Ltd Optical pickup device
JPH08249710A (en) * 1995-01-12 1996-09-27 Ricoh Co Ltd Optical head
JPH08273189A (en) * 1995-02-15 1996-10-18 Daewoo Electron Co Ltd Optical head of optical disk recording/reproducing apparatus
WO1999024852A1 (en) * 1997-10-16 1999-05-20 Matsushita Electric Industrial Co., Ltd. Hologram element polarization separating device, polarization illuminating device, and image display
US6385158B1 (en) 1997-10-29 2002-05-07 Sanyo Electric Co., Ltd. Optical pickup device having compatibility with tracking system, and optical disk recording/reproduction apparatus using the same
US6584060B1 (en) 1998-06-24 2003-06-24 Ricoh Company, Ltd. Optical pick-up device for recording/reading information on optical recording medium
US6845077B2 (en) 1998-06-24 2005-01-18 Ricoh Company, Ltd. Optical pick-up device with convergent light diffraction for recording/reading information on optical recording medium

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