JPS648782A - Projecting optical device - Google Patents

Projecting optical device

Info

Publication number
JPS648782A
JPS648782A JP16236087A JP16236087A JPS648782A JP S648782 A JPS648782 A JP S648782A JP 16236087 A JP16236087 A JP 16236087A JP 16236087 A JP16236087 A JP 16236087A JP S648782 A JPS648782 A JP S648782A
Authority
JP
Japan
Prior art keywords
light
lens
point
plane
image
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
JP16236087A
Other languages
Japanese (ja)
Inventor
Yuji Mori
Keiji Nagae
Tadahiko Hashimoto
Giichi Nakamura
Katsushige Nakamura
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.)
Hitachi Ltd
Mitaka Kohki Co Ltd
Original Assignee
Hitachi Ltd
Mitaka Kohki 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 Hitachi Ltd, Mitaka Kohki Co Ltd filed Critical Hitachi Ltd
Priority to JP16236087A priority Critical patent/JPS648782A/en
Publication of JPS648782A publication Critical patent/JPS648782A/en
Pending legal-status Critical Current

Links

Landscapes

  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To obtain a bright screen without distortion by separating a picture element on an object face of a projecting lens from the center axis of the projecting lens without increasing the capacity of light source. CONSTITUTION:A reflecting mirror 104 exists to utilize the light spread from the light source 101 to the opposite side from a condenser lens 103 and the light 104' collected by the lens 103 is converged toward a point 105. In placing the video image element 108 on a plane where the object plane 107 of the projecting lens 106 and the light 104' cross together, the light 104' is reflected and converged toward a point 109 in the mirror image relation to the point 105 with respect to be object plane 107. In making the point 109 coincident with a major point of the lens 106, the light 104' is spread as it is to radiate the screen 111 on the image plane 110 of the lens 106. In this case, the actual aperture diameter of the lens 106 is the size of the image of the light source 101 and the light reaches the screen without any loss.
JP16236087A 1987-07-01 1987-07-01 Projecting optical device Pending JPS648782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16236087A JPS648782A (en) 1987-07-01 1987-07-01 Projecting optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16236087A JPS648782A (en) 1987-07-01 1987-07-01 Projecting optical device

Publications (1)

Publication Number Publication Date
JPS648782A true JPS648782A (en) 1989-01-12

Family

ID=15753088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16236087A Pending JPS648782A (en) 1987-07-01 1987-07-01 Projecting optical device

Country Status (1)

Country Link
JP (1) JPS648782A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917802A (en) * 1982-07-21 1984-01-30 Mitsubishi Electric Corp Chopper unit for electric rolling stock
JPS6222136A (en) * 1985-07-23 1987-01-30 Casio Comput Co Ltd Electronic blackboard

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917802A (en) * 1982-07-21 1984-01-30 Mitsubishi Electric Corp Chopper unit for electric rolling stock
JPS6222136A (en) * 1985-07-23 1987-01-30 Casio Comput Co Ltd Electronic blackboard

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