JPS54109457A - F.theta lens system - Google Patents

F.theta lens system

Info

Publication number
JPS54109457A
JPS54109457A JP1606078A JP1606078A JPS54109457A JP S54109457 A JPS54109457 A JP S54109457A JP 1606078 A JP1606078 A JP 1606078A JP 1606078 A JP1606078 A JP 1606078A JP S54109457 A JPS54109457 A JP S54109457A
Authority
JP
Japan
Prior art keywords
lens
sides
theta
refractive
preset
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
JP1606078A
Other languages
Japanese (ja)
Other versions
JPS6145803B2 (en
Inventor
Atsushi Kawamura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP1606078A priority Critical patent/JPS54109457A/en
Publication of JPS54109457A publication Critical patent/JPS54109457A/en
Publication of JPS6145803B2 publication Critical patent/JPS6145803B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Mechanical Optical Scanning Systems (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To provide an f theta lens, which has a wide angle and which is compact and light, by satisfying the two points of reducing the afocal spacing and astigmatism and of establishing the distorsion aberration of a preset negative value as well as preset conditions. CONSTITUTION:A first lens 11 is a negative meniscus lens and is arranged to have its concave side of smaller radius of curvature facing an iris E. A second lens 12 is a positive meniscus lens and is arranged to have its convex side of smaller radius of curvature facing an image. A third lens 13 is a lens having both convex sides. Those three lenses constitute an f theta lens system. Thus, an f theta lens, which has a distance do between the first side of the first lens and the iris determined by the relationship of 0.05f<do<0.15f and an angle of view of 66 degrees, can be produced by making the conditions of Equations 1 to 6 satisfied by the respective lenses in their focal lengthes, radii of curvature of the refractive sides, spacings between the refractive sides on the optical axis, and the refractive indexes for the light of preset wavelength.
JP1606078A 1978-02-15 1978-02-15 F.theta lens system Granted JPS54109457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1606078A JPS54109457A (en) 1978-02-15 1978-02-15 F.theta lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1606078A JPS54109457A (en) 1978-02-15 1978-02-15 F.theta lens system

Publications (2)

Publication Number Publication Date
JPS54109457A true JPS54109457A (en) 1979-08-28
JPS6145803B2 JPS6145803B2 (en) 1986-10-09

Family

ID=11906019

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1606078A Granted JPS54109457A (en) 1978-02-15 1978-02-15 F.theta lens system

Country Status (1)

Country Link
JP (1) JPS54109457A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105715A (en) * 1980-12-24 1982-07-01 Canon Inc Uniform scanning lens having high resolving power
JPS597918A (en) * 1982-07-06 1984-01-17 Asahi Optical Co Ltd F-theta lens system
JPS59195211A (en) * 1983-04-19 1984-11-06 Asahi Optical Co Ltd Telecentric ftheta lens system of four-element constitution
JPS60153017A (en) * 1984-01-23 1985-08-12 Asahi Optical Co Ltd Large-diameter f-theta lens
JPS63104009A (en) * 1986-10-21 1988-05-09 Matsushita Electric Ind Co Ltd Constant speed scanning lens
JPS63124015A (en) * 1986-11-14 1988-05-27 Canon Inc Scanner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS519463A (en) * 1974-07-13 1976-01-26 Olympus Optical Co KOGAKUSOSAKEI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS519463A (en) * 1974-07-13 1976-01-26 Olympus Optical Co KOGAKUSOSAKEI

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105715A (en) * 1980-12-24 1982-07-01 Canon Inc Uniform scanning lens having high resolving power
JPS597918A (en) * 1982-07-06 1984-01-17 Asahi Optical Co Ltd F-theta lens system
JPS6151289B2 (en) * 1982-07-06 1986-11-08 Asahi Optical Co Ltd
JPS59195211A (en) * 1983-04-19 1984-11-06 Asahi Optical Co Ltd Telecentric ftheta lens system of four-element constitution
JPS6211324B2 (en) * 1983-04-19 1987-03-12 Asahi Optical Co Ltd
JPS60153017A (en) * 1984-01-23 1985-08-12 Asahi Optical Co Ltd Large-diameter f-theta lens
JPS6327684B2 (en) * 1984-01-23 1988-06-03 Asahi Optical Co Ltd
JPS63104009A (en) * 1986-10-21 1988-05-09 Matsushita Electric Ind Co Ltd Constant speed scanning lens
JPS63124015A (en) * 1986-11-14 1988-05-27 Canon Inc Scanner
JPH0746174B2 (en) * 1986-11-14 1995-05-17 キヤノン株式会社 Scanning device

Also Published As

Publication number Publication date
JPS6145803B2 (en) 1986-10-09

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