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JPS563440A - Add-on setting method for laser video disk device - Google Patents

Add-on setting method for laser video disk device

Info

Publication number
JPS563440A
JPS563440A JP7814579A JP7814579A JPS563440A JP S563440 A JPS563440 A JP S563440A JP 7814579 A JP7814579 A JP 7814579A JP 7814579 A JP7814579 A JP 7814579A JP S563440 A JPS563440 A JP S563440A
Authority
JP
Japan
Prior art keywords
wedge
add
shaped lens
disk device
setting method
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
JP7814579A
Other languages
Japanese (ja)
Inventor
Toshihiro Takahashi
Kyoichi Yamashita
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7814579A priority Critical patent/JPS563440A/en
Publication of JPS563440A publication Critical patent/JPS563440A/en
Pending legal-status Critical Current

Links

Landscapes

  • Mounting And Adjusting Of Optical Elements (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: To realize the add-on additional writing with no use of the wedge-shaped lens but by securing an agreement between the 1st and the 2nd recording beams optical axes by the wedge-shaped lens at the assembling time of the optical system and then removing the wedge-shaped lens after the assembling.
CONSTITUTION: Wedge-shaped lens 20 is inserted into the optical path of the 1st recording beam when the optical system is assembled. Under these conditions, the control is given to the mirror and others in order to secure an agreement between the surface of disk 19 and the 1st and the 2nd recording beams. When lens 20 is removed after the control, the optical axis of the 1st recording beam is bent by θ as shown by the dotted line in the figure. This angle is equivalent to track space 1.5W2μm on the surface of disk 19, and thus the new track can be recorded at the inner side of the most inner circumference. At this moment, the tracking is given to the track of the most inner circumference. As a result, the use of the wedge-shaped lens can be omitted at the add-on time.
COPYRIGHT: (C)1981,JPO&Japio
JP7814579A 1979-06-22 1979-06-22 Add-on setting method for laser video disk device Pending JPS563440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7814579A JPS563440A (en) 1979-06-22 1979-06-22 Add-on setting method for laser video disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7814579A JPS563440A (en) 1979-06-22 1979-06-22 Add-on setting method for laser video disk device

Publications (1)

Publication Number Publication Date
JPS563440A true JPS563440A (en) 1981-01-14

Family

ID=13653714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7814579A Pending JPS563440A (en) 1979-06-22 1979-06-22 Add-on setting method for laser video disk device

Country Status (1)

Country Link
JP (1) JPS563440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3532808A1 (en) * 1984-04-13 1987-03-19 Toyo Kohan Co Ltd TINNED AND NICKEL PLATED STEEL SHEET AND METHOD FOR THE PRODUCTION THEREOF

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3532808A1 (en) * 1984-04-13 1987-03-19 Toyo Kohan Co Ltd TINNED AND NICKEL PLATED STEEL SHEET AND METHOD FOR THE PRODUCTION THEREOF

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