JPS5669123A - Method of manufacturing prism - Google Patents

Method of manufacturing prism

Info

Publication number
JPS5669123A
JPS5669123A JP14665879A JP14665879A JPS5669123A JP S5669123 A JPS5669123 A JP S5669123A JP 14665879 A JP14665879 A JP 14665879A JP 14665879 A JP14665879 A JP 14665879A JP S5669123 A JPS5669123 A JP S5669123A
Authority
JP
Japan
Prior art keywords
margin
cavity
pentaprism
ripples
concentrated
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
JP14665879A
Other languages
Japanese (ja)
Inventor
Masamichi Miyazaki
Yasuhiro Jodai
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 JP14665879A priority Critical patent/JPS5669123A/en
Publication of JPS5669123A publication Critical patent/JPS5669123A/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
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures

Landscapes

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

Abstract

PURPOSE:To reduce the time required for the whole molding cycle by a method wherein ripples are concentrated in a margin to be cut away in the post processes so as to manufacture a prism with high accuracy. CONSTITUTION:A lower mold 4 is connected to an upper mold 3 to form a cavity K in the form of a pentaprism. Melted molding material is supplied to the cavity K from an injection cylinder 7. Then, the cavity K is cooled while keeping the molding pressure constant for a predetemined time through the operation of the injection cylinder 7. Current is supplied to a heater 61 for a predetermined time from a control circuit 62 so as to keep the surrounding of a wall 411 facing a piston at the higher temperature than the rest. the surrounding of the wall 411, or a margin 18 becomes softer than the rest and locates a position where a large surface with the maximum area is formed, so that tensile stress is concentrated in the margin 18 at the maximum level. Therefore, ripples are not generated at other optical surfaces, so it becomes possible to manufacture the pentaprism with high accuracy.
JP14665879A 1979-11-13 1979-11-13 Method of manufacturing prism Pending JPS5669123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14665879A JPS5669123A (en) 1979-11-13 1979-11-13 Method of manufacturing prism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14665879A JPS5669123A (en) 1979-11-13 1979-11-13 Method of manufacturing prism

Publications (1)

Publication Number Publication Date
JPS5669123A true JPS5669123A (en) 1981-06-10

Family

ID=15412693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14665879A Pending JPS5669123A (en) 1979-11-13 1979-11-13 Method of manufacturing prism

Country Status (1)

Country Link
JP (1) JPS5669123A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165101A (en) * 1980-05-26 1981-12-18 Takarazuka Kasei Kk Antigiddiness mirror made of synthetic resin and its preparation
TWI593543B (en) * 2015-01-22 2017-08-01 尚立光電股份有限公司 Method for embeded injection molding prism and prism manufactored by using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165101A (en) * 1980-05-26 1981-12-18 Takarazuka Kasei Kk Antigiddiness mirror made of synthetic resin and its preparation
TWI593543B (en) * 2015-01-22 2017-08-01 尚立光電股份有限公司 Method for embeded injection molding prism and prism manufactored by using the same

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