JPS5741926A - Manufacture of pentagonal roof prism - Google Patents

Manufacture of pentagonal roof prism

Info

Publication number
JPS5741926A
JPS5741926A JP11757780A JP11757780A JPS5741926A JP S5741926 A JPS5741926 A JP S5741926A JP 11757780 A JP11757780 A JP 11757780A JP 11757780 A JP11757780 A JP 11757780A JP S5741926 A JPS5741926 A JP S5741926A
Authority
JP
Japan
Prior art keywords
face
edge
prism
optically
finish
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
JP11757780A
Other languages
Japanese (ja)
Inventor
Masamichi Miyazaki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP11757780A priority Critical patent/JPS5741926A/en
Publication of JPS5741926A publication Critical patent/JPS5741926A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain the titled prism at low cost by providing the gate for injection molding on the optically unused face and finish-polishing the optically used roof face of the mold. CONSTITUTION:Injection molds are used wherein the parting line (y) coincides with the edge line (y) of the prism, the gates M1, M2 are provided on the faces H1, H2 corresponding with the optically unused face H and the nozzle acceptor N, the sprue S and the runners R1, R2 are drilled. Each face of C1, C2, D1, D2, E1, E2 is perfectly mirror-finished, while the races A1, A2, B1, B2 corresponding with the roof face A, B of the taken out blocks are finish-polished to improve the flatness thereof, also, edge quality of edge line (y) and the accuracy of 90 deg. edge angle.
JP11757780A 1980-08-26 1980-08-26 Manufacture of pentagonal roof prism Pending JPS5741926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11757780A JPS5741926A (en) 1980-08-26 1980-08-26 Manufacture of pentagonal roof prism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11757780A JPS5741926A (en) 1980-08-26 1980-08-26 Manufacture of pentagonal roof prism

Publications (1)

Publication Number Publication Date
JPS5741926A true JPS5741926A (en) 1982-03-09

Family

ID=14715257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11757780A Pending JPS5741926A (en) 1980-08-26 1980-08-26 Manufacture of pentagonal roof prism

Country Status (1)

Country Link
JP (1) JPS5741926A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105988149A (en) * 2015-01-22 2016-10-05 尚立光电股份有限公司 Method for embedding emergent prism and optical prism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105988149A (en) * 2015-01-22 2016-10-05 尚立光电股份有限公司 Method for embedding emergent prism and optical prism
CN105988149B (en) * 2015-01-22 2018-09-04 尚立光电股份有限公司 Method for embedding emergent prism and optical prism

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