JPS6419315A - F-theta lens - Google Patents

F-theta lens

Info

Publication number
JPS6419315A
JPS6419315A JP62164539A JP16453987A JPS6419315A JP S6419315 A JPS6419315 A JP S6419315A JP 62164539 A JP62164539 A JP 62164539A JP 16453987 A JP16453987 A JP 16453987A JP S6419315 A JPS6419315 A JP S6419315A
Authority
JP
Japan
Prior art keywords
lens
lenses
theta
ftheta
light beam
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
JP62164539A
Other languages
Japanese (ja)
Other versions
JPH0746170B2 (en
Inventor
Nobuhiro Araki
Yukio Sakagaito
Koichi Kawada
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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
Priority claimed from JP61162305A external-priority patent/JPS62201410A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of JPS6419315A publication Critical patent/JPS6419315A/en
Publication of JPH0746170B2 publication Critical patent/JPH0746170B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/0005—Optical objectives specially designed for the purposes specified below having F-Theta characteristic

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To minimize image curvature in a sagittal direction and to obtain bright highly resolved image by employing five-group, five-element constitution including a negative meniscus lens and making it concentric about a stop, and shortening the overall length. CONSTITUTION:This f.theta lens has the five-group, five-element constitution consisting of a 1st lens 1, a 3rd lens 3, a 4th lens 4, and a 5th lens 5 which are positive meniscus lenses having their concave surface on light beam incidence sides and a 2nd lens 2 which is a negative meniscus lens having its concave surface on a light beam incidence side. Then this f.theta lens is so designed that negative distortion which is the feature of a ftheta lens is generated and the value of D'=(Y'-ftheta) showing equal-speed scanning performance is nearly zero, where (f) is the focal length of the whole system, theta is an angle of deflection, and Y' is the distance of an image formation position from the optical axis. This f.theta lens meets requirements shown by 1. Here, r2, r3, and r5 are the projection surface of the 1st lens and the incidence surfaces of the 2nd and 3rd lenses, n2, n5, n7, and n9 the thickness of the 2nd, 3rd, 4th, and 5th lenses, d4, d6, and d8 are the surface gaps of the 2nd-5th lenses, and (f) the focal length of the whole system.
JP62164539A 1986-07-10 1987-07-01 f / θ lens Expired - Lifetime JPH0746170B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61162305A JPS62201410A (en) 1985-11-08 1986-07-10 f/theta lens
JP61-162305 1986-07-10

Publications (2)

Publication Number Publication Date
JPS6419315A true JPS6419315A (en) 1989-01-23
JPH0746170B2 JPH0746170B2 (en) 1995-05-17

Family

ID=15751979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62164539A Expired - Lifetime JPH0746170B2 (en) 1986-07-10 1987-07-01 f / θ lens

Country Status (1)

Country Link
JP (1) JPH0746170B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015011343A (en) * 2013-06-28 2015-01-19 玉晶光電股▲ふん▼有限公司 Image capturing lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5553308A (en) * 1978-10-16 1980-04-18 Olympus Optical Co Ltd Lens for equal speed scanning

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5553308A (en) * 1978-10-16 1980-04-18 Olympus Optical Co Ltd Lens for equal speed scanning

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015011343A (en) * 2013-06-28 2015-01-19 玉晶光電股▲ふん▼有限公司 Image capturing lens
US9134505B2 (en) 2013-06-28 2015-09-15 Genius Electronic Optical Co., Ltd. Imaging lens, and electronic apparatus including the same

Also Published As

Publication number Publication date
JPH0746170B2 (en) 1995-05-17

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