JPS5590918A - Projector - Google Patents

Projector

Info

Publication number
JPS5590918A
JPS5590918A JP16605578A JP16605578A JPS5590918A JP S5590918 A JPS5590918 A JP S5590918A JP 16605578 A JP16605578 A JP 16605578A JP 16605578 A JP16605578 A JP 16605578A JP S5590918 A JPS5590918 A JP S5590918A
Authority
JP
Japan
Prior art keywords
bar
form lenses
lenses
light
lens
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
JP16605578A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Midorikawa
Atsuo Tsunoda
Hidetoshi Murase
Noritaka Mochizuki
Setsuo Minami
Yoshiya Matsui
Masazumi Moriwaki
Mikio Suzuta
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 JP16605578A priority Critical patent/JPS5590918A/en
Priority to US06/105,789 priority patent/US4275962A/en
Priority to DE2951452A priority patent/DE2951452A1/en
Priority to GB7944021A priority patent/GB2042759B/en
Priority to FR7931862A priority patent/FR2445544B1/en
Publication of JPS5590918A publication Critical patent/JPS5590918A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Lenses (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE: To obtain the high-performance projection optical system by inserting and fixing bar-form lenses in lens-barrels by way of light-absorptive materials, in the projection system of the copying machine.
CONSTITUTION: The 1st bar-form lenses 40 being telecentric on the exit side and 2nd bar-form lenses 41 being telecentric on the incident side, whose respective lengths in the optical axis direction are 2W60 times the effective diameter are fitted and fixed into lens barrels 61 by way of clad materials 62, 63 having the refractive index nearly the same as that of the both lenses 40, 41 and also having light absorptivity, in such a manner that they become perpendicularly coaxial to the object surface and projection surface. As a result of this, the light entered the 1st bar-form lenses 40 from other than the object field where the illuminance on the projection surface becomes constant is absorbed and attenuated by the clad materials 62, 63 and is thereby prevented from re-entering the 1st, 2nd bar-form lenses 40, 41 and does no longer transmit to the lens barrel 61 side, thus only the effective luminous flux is transmitted and the ideal light intensity distribution formed.
COPYRIGHT: (C)1980,JPO&Japio
JP16605578A 1978-12-28 1978-12-28 Projector Pending JPS5590918A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP16605578A JPS5590918A (en) 1978-12-28 1978-12-28 Projector
US06/105,789 US4275962A (en) 1978-12-28 1979-12-20 Projection device
DE2951452A DE2951452A1 (en) 1978-12-28 1979-12-20 PROJECTION DEVICE
GB7944021A GB2042759B (en) 1978-12-28 1979-12-21 Projection device
FR7931862A FR2445544B1 (en) 1978-12-28 1979-12-27 MULTIPLE OBJECTIVE PROJECTION DEVICE FOR COPY MACHINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16605578A JPS5590918A (en) 1978-12-28 1978-12-28 Projector

Publications (1)

Publication Number Publication Date
JPS5590918A true JPS5590918A (en) 1980-07-10

Family

ID=15824120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16605578A Pending JPS5590918A (en) 1978-12-28 1978-12-28 Projector

Country Status (1)

Country Link
JP (1) JPS5590918A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013045093A (en) * 2011-08-26 2013-03-04 Kyocera Corp Erecting equal-magnification lens array unit and image reading apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013045093A (en) * 2011-08-26 2013-03-04 Kyocera Corp Erecting equal-magnification lens array unit and image reading apparatus

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