JPS55926A - Focus servo unit of optical information reader - Google Patents

Focus servo unit of optical information reader

Info

Publication number
JPS55926A
JPS55926A JP7352378A JP7352378A JPS55926A JP S55926 A JPS55926 A JP S55926A JP 7352378 A JP7352378 A JP 7352378A JP 7352378 A JP7352378 A JP 7352378A JP S55926 A JPS55926 A JP S55926A
Authority
JP
Japan
Prior art keywords
point
lens
distance
focus servo
photo
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.)
Granted
Application number
JP7352378A
Other languages
Japanese (ja)
Other versions
JPS6040094B2 (en
Inventor
Hitoshi Kanamaru
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.)
Pioneer Video Corp
Universal Pioneer Corp
Original Assignee
Pioneer Video Corp
Universal Pioneer 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 Pioneer Video Corp, Universal Pioneer Corp filed Critical Pioneer Video Corp
Priority to JP53073523A priority Critical patent/JPS6040094B2/en
Publication of JPS55926A publication Critical patent/JPS55926A/en
Publication of JPS6040094B2 publication Critical patent/JPS6040094B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To obtain the best photo detection output and also to carry out focus servo operation with no malfunction by adequately selecting the position relation among a cylindrical lens, photo detecting element and condenser lens.
CONSTITUTION: The stop radius of condenser lens 5 and the distance between the principal point of cylindrical lens 8 and photo detecting element 9 aredenoted by R and C respectively, and the distance between conjugate point S of recording surface 7 as to condenser lens 5 when illumination light focuses on surface 7 and element 9, the distance between lens 5 and conjunction point S, and the shift from normal conjugated point S to conjugate point S' when recording surface 7 shifts in position are by D, L and Z. Lengths X and Y of the photo detection shape crossing at right angles on the photo detection surface of element 9 are expressed by equations 1 and 2. Length Y is measured in parallel to the generating line of cylindrical lens 8, and X is perpendicular to this generating line. With C greater than D, lengths X and Y are set below value (2RC/[(C+D)]) when Z is equal to C+D or below value 2RD/L when Z is equal to zero.
COPYRIGHT: (C)1980,JPO&Japio
JP53073523A 1978-06-16 1978-06-16 Focus servo device for optical information reading device Expired JPS6040094B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53073523A JPS6040094B2 (en) 1978-06-16 1978-06-16 Focus servo device for optical information reading device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53073523A JPS6040094B2 (en) 1978-06-16 1978-06-16 Focus servo device for optical information reading device

Publications (2)

Publication Number Publication Date
JPS55926A true JPS55926A (en) 1980-01-07
JPS6040094B2 JPS6040094B2 (en) 1985-09-09

Family

ID=13520674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53073523A Expired JPS6040094B2 (en) 1978-06-16 1978-06-16 Focus servo device for optical information reading device

Country Status (1)

Country Link
JP (1) JPS6040094B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409588A1 (en) 1983-03-16 1984-09-20 Pioneer Electronic Corp., Tokio/Tokyo SERVO SYSTEM IN A DATA READER

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5319805A (en) * 1976-08-09 1978-02-23 Hitachi Ltd Automatic focusing optical device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5319805A (en) * 1976-08-09 1978-02-23 Hitachi Ltd Automatic focusing optical device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409588A1 (en) 1983-03-16 1984-09-20 Pioneer Electronic Corp., Tokio/Tokyo SERVO SYSTEM IN A DATA READER
US4748610A (en) * 1983-03-16 1988-05-31 Pioneer Electronic Corporation Servo system in data reading apparatus

Also Published As

Publication number Publication date
JPS6040094B2 (en) 1985-09-09

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