JPS558668A - Optical axis control unit of optical information reader - Google Patents

Optical axis control unit of optical information reader

Info

Publication number
JPS558668A
JPS558668A JP8173578A JP8173578A JPS558668A JP S558668 A JPS558668 A JP S558668A JP 8173578 A JP8173578 A JP 8173578A JP 8173578 A JP8173578 A JP 8173578A JP S558668 A JPS558668 A JP S558668A
Authority
JP
Japan
Prior art keywords
circuit
frequency
optical axis
oscillator
output
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
JP8173578A
Other languages
Japanese (ja)
Inventor
Kazuo Hirasawa
Mitsushige Kondo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8173578A priority Critical patent/JPS558668A/en
Publication of JPS558668A publication Critical patent/JPS558668A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To enlarge the ratio of required frequency components to needless frequency components to improve an optical axis control precision by leading in frequency signals sufficiently larger than the frequency, which vibrates the optical axis minutely, to control the optical axis by phase comparison.
CONSTITUTION: When rotary recording medium 7 is irradiated by the laser light passing through mirror 4 which is vibrated minutely through oscillator 12, the reflection laser light is detected by photoelectric conversion element 9, etc., and is detected by detection circuit 14 and is applied to multiplier circuit 20. Meanwhile, signals outputted from oscillator 19 having a frequency sufficiently larger than the oscillated output frequency of oscillator 12 are applied to circuit 20. The output of circuit 20 is compared with the multiplication output of oscillators 21 and 19 through multiplier circuit 22 and BPF 23 by phase comparison circuit 16 through BPF 21. At this comparison time, since the ratio of required frequency components to needless frequency components is large due to the leading-in of high-frequency signals of oscillator 19, the comparison output of circuit 16 becomes tracking signals with a small influence of needless components and controls the rotation of mirror 5, and the optical axis for tracking is controlled with a high precision.
COPYRIGHT: (C)1980,JPO&Japio
JP8173578A 1978-07-04 1978-07-04 Optical axis control unit of optical information reader Pending JPS558668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8173578A JPS558668A (en) 1978-07-04 1978-07-04 Optical axis control unit of optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8173578A JPS558668A (en) 1978-07-04 1978-07-04 Optical axis control unit of optical information reader

Publications (1)

Publication Number Publication Date
JPS558668A true JPS558668A (en) 1980-01-22

Family

ID=13754677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8173578A Pending JPS558668A (en) 1978-07-04 1978-07-04 Optical axis control unit of optical information reader

Country Status (1)

Country Link
JP (1) JPS558668A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076524U (en) * 1983-11-01 1985-05-29 三菱自動車工業株式会社 vehicle air intake device
JPH07256181A (en) * 1995-02-02 1995-10-09 Nankai:Kk Color sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076524U (en) * 1983-11-01 1985-05-29 三菱自動車工業株式会社 vehicle air intake device
JPH0241057Y2 (en) * 1983-11-01 1990-11-01
JPH07256181A (en) * 1995-02-02 1995-10-09 Nankai:Kk Color sheet

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