JPS57157213A - Focal length variable lens - Google Patents

Focal length variable lens

Info

Publication number
JPS57157213A
JPS57157213A JP4276981A JP4276981A JPS57157213A JP S57157213 A JPS57157213 A JP S57157213A JP 4276981 A JP4276981 A JP 4276981A JP 4276981 A JP4276981 A JP 4276981A JP S57157213 A JPS57157213 A JP S57157213A
Authority
JP
Japan
Prior art keywords
focal length
changed
power
negative
positive
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
JP4276981A
Other languages
Japanese (ja)
Inventor
Yoshibumi Nishimoto
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP4276981A priority Critical patent/JPS57157213A/en
Priority to US06/359,034 priority patent/US4466703A/en
Priority to DE19823210629 priority patent/DE3210629A1/en
Publication of JPS57157213A publication Critical patent/JPS57157213A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

PURPOSE:To obtain a small-size focal length variable lens where the focal length is changed in a high speed and the power is changed to positive or negative, by providing a polarizing means and a means for changing an applied voltage which has an inclined intensity distribution in a plane vertical to the direction of incidence of the light of an electrooptic crystal. CONSTITUTION:The first transparent electrode 2 consisting of plural concentric ring- shaped transparent electrodes 21-2n at equal intervals is provided on one face of a KH2PO4 crystal 1 having the primary electrooptic effect, and the second plane transparent electrode 4 is provided on the other face of the crystal 1, and a polarizing plate 5 is arranged in the optical path. A variable voltage is applied to transparent electrodes 21-2n from leader lines of a power source 6 where resistances R1-Rn satisfying Rm=R/2+R(m-1) (R is an optional constant and m is a natural number) are connected in parallel with a variable power source 7. The focal length is changed in accordance with the applied voltage, and the power is changed to positive or negative by rotating the polarization direction by the polarizing plate 5. Since the voltage control and the rotation of the polarization plane are utilized, a small-size focal length variable lens is obtained where the focal length is changed in a high speed and the power is changed positive or negative.
JP4276981A 1981-03-24 1981-03-24 Focal length variable lens Pending JPS57157213A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP4276981A JPS57157213A (en) 1981-03-24 1981-03-24 Focal length variable lens
US06/359,034 US4466703A (en) 1981-03-24 1982-03-17 Variable-focal-length lens using an electrooptic effect
DE19823210629 DE3210629A1 (en) 1981-03-24 1982-03-23 Lens having a variable focal length

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4276981A JPS57157213A (en) 1981-03-24 1981-03-24 Focal length variable lens

Publications (1)

Publication Number Publication Date
JPS57157213A true JPS57157213A (en) 1982-09-28

Family

ID=12645175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4276981A Pending JPS57157213A (en) 1981-03-24 1981-03-24 Focal length variable lens

Country Status (1)

Country Link
JP (1) JPS57157213A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538062A1 (en) * 1984-10-25 1986-04-30 Canon K.K., Tokio/Tokyo POSITION MEASURING DEVICE
DE3600325A1 (en) * 1985-01-09 1986-07-10 Canon K.K., Tokio/Tokyo LENS WITH CHANGEABLE Focal Length
DE3600324A1 (en) * 1985-01-09 1986-07-10 Canon K.K., Tokio/Tokyo LENS WITH CHANGEABLE Focal Length

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49615A (en) * 1972-04-17 1974-01-07
JPS4946442A (en) * 1972-09-06 1974-05-04

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49615A (en) * 1972-04-17 1974-01-07
JPS4946442A (en) * 1972-09-06 1974-05-04

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538062A1 (en) * 1984-10-25 1986-04-30 Canon K.K., Tokio/Tokyo POSITION MEASURING DEVICE
DE3600325A1 (en) * 1985-01-09 1986-07-10 Canon K.K., Tokio/Tokyo LENS WITH CHANGEABLE Focal Length
DE3600324A1 (en) * 1985-01-09 1986-07-10 Canon K.K., Tokio/Tokyo LENS WITH CHANGEABLE Focal Length

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