JPS64944A - Overhead projector - Google Patents

Overhead projector

Info

Publication number
JPS64944A
JPS64944A JP15722687A JP15722687A JPS64944A JP S64944 A JPS64944 A JP S64944A JP 15722687 A JP15722687 A JP 15722687A JP 15722687 A JP15722687 A JP 15722687A JP S64944 A JPS64944 A JP S64944A
Authority
JP
Japan
Prior art keywords
optical axis
projection lens
projection
plane perpendicular
optical system
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
JP15722687A
Other languages
Japanese (ja)
Other versions
JPH01944A (en
Inventor
Toshiyuki Koura
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
Canon Precision Inc
Original Assignee
Canon Inc
Canon Precision 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, Canon Precision Inc filed Critical Canon Inc
Priority to JP62-157226A priority Critical patent/JPH01944A/en
Priority claimed from JP62-157226A external-priority patent/JPH01944A/en
Publication of JPS64944A publication Critical patent/JPS64944A/en
Publication of JPH01944A publication Critical patent/JPH01944A/en
Pending legal-status Critical Current

Links

Landscapes

  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE: To obtain uniform sharpness over an full image projected on a screen by providing a projection lens freely rotatably, centered about one straight line on a plane perpendicular to the optical axis of said lens which passes the intersection of the plane perpendicular to the optical axis of the projection lens and that of a projection optical system.
CONSTITUTION: Centering around the straight line, the projection lens 7 is freely rotatably provided on the plane perpendicular to the optical axis of the projection lens which passes the intersection of the plane perpendicular to the optical axis of the projection lens and that of the projection optical system. When an full image projected on the screen 9 is not clear, the projection lens 7 and an upper reflection mirror 8 are moved in the direction of the optical axis of the projection optical system to make a part of the image clear. When the projection lens 7 is turned by centering around one straight line on the plane perpendicular to the optical axis of the projection lens which passes the intersection of the plane perpendicular to the optical axis of the projection lens and that of the projection optical system, the full image on the screen 9 becomes clear. These actions are repeated several times, then the full clear, uniform image can be obtained on the screen 9 which is not perpendicular to the optical axis of the projection optical system.
COPYRIGHT: (C)1989,JPO&Japio
JP62-157226A 1987-06-24 overhead projector Pending JPH01944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-157226A JPH01944A (en) 1987-06-24 overhead projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62-157226A JPH01944A (en) 1987-06-24 overhead projector

Publications (2)

Publication Number Publication Date
JPS64944A true JPS64944A (en) 1989-01-05
JPH01944A JPH01944A (en) 1989-01-05

Family

ID=

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