JPS56156821A - Focus plate - Google Patents

Focus plate

Info

Publication number
JPS56156821A
JPS56156821A JP6116480A JP6116480A JPS56156821A JP S56156821 A JPS56156821 A JP S56156821A JP 6116480 A JP6116480 A JP 6116480A JP 6116480 A JP6116480 A JP 6116480A JP S56156821 A JPS56156821 A JP S56156821A
Authority
JP
Japan
Prior art keywords
face
focus
focus plate
lens
convex
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
JP6116480A
Other languages
Japanese (ja)
Inventor
Tomio Onozato
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP6116480A priority Critical patent/JPS56156821A/en
Publication of JPS56156821A publication Critical patent/JPS56156821A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)

Abstract

PURPOSE:To obtain a thin lens of indistinctive annular lines, by making the other face convex in the focus plate which has the rugged plane, which forms the focus face, as one face and by forming multiple annular lenses, which constitute the Fresnel lens, on the surface of the peripheral part, at least, of this convex face. CONSTITUTION:In respect to focus plate 1, one face is plane 2, and the other is convex face 3. Plane 2 is the rugged focus face similarly to the normal focus plate. Meanwhile, in respect to convex face 3, part 4 of the sphere is used as the base, and multiple annular lenses 5 which constitute the normal Fresnel lens are formed on the base. This focus plate is a single optical element having three functions of the conventional focus plate, the Fresnel lens, and the condenser lens, and consequently, this focus lens is formed in one molding process by the acrylic resin, etc. and is not thick so much, and annular lines are not distinct so much.
JP6116480A 1980-05-08 1980-05-08 Focus plate Pending JPS56156821A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6116480A JPS56156821A (en) 1980-05-08 1980-05-08 Focus plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6116480A JPS56156821A (en) 1980-05-08 1980-05-08 Focus plate

Publications (1)

Publication Number Publication Date
JPS56156821A true JPS56156821A (en) 1981-12-03

Family

ID=13163222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6116480A Pending JPS56156821A (en) 1980-05-08 1980-05-08 Focus plate

Country Status (1)

Country Link
JP (1) JPS56156821A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2422163B1 (en) * 2009-04-21 2020-01-01 Raytheon Company Projectile guidance system including a compact semi-active laser seeker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2422163B1 (en) * 2009-04-21 2020-01-01 Raytheon Company Projectile guidance system including a compact semi-active laser seeker

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