JPS5672932A - Manufacture of prism - Google Patents

Manufacture of prism

Info

Publication number
JPS5672932A
JPS5672932A JP14848779A JP14848779A JPS5672932A JP S5672932 A JPS5672932 A JP S5672932A JP 14848779 A JP14848779 A JP 14848779A JP 14848779 A JP14848779 A JP 14848779A JP S5672932 A JPS5672932 A JP S5672932A
Authority
JP
Japan
Prior art keywords
molding
margin
cavity
molded
prism
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
JP14848779A
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 JP14848779A priority Critical patent/JPS5672932A/en
Publication of JPS5672932A publication Critical patent/JPS5672932A/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
    • 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
    • B29C45/26—Moulds

Abstract

PURPOSE:To raise the precision of the prism made of plastic material by a method wherein the prism is molded with provision of a margin to take at a focusing plane or a peeping plane and specularized in a post-processing grinding process. CONSTITUTION:In the matching surface 31 of an upper die 3 a wall 311 corresponding to the focusing plane is provided in concave larger by a portion for the margin 18 to take and the cavities 32 and 43 of the upper and lower dies are matched, whereby a cavity K in the form of a pentaprism 1 is formed. An injection cylinder 7 being operated, melted material P is supplied to the cavity K for molding. After that, the material P for molding within the cavity K is cooled in a molding- cooling process and simultaneously the pressure-maintaining operation giving a prescribed volume of molding pressure continuously by the operation of the injection cylinder 7 is performed. To the molded pentaprism 1 is applied the post-processing grinding process wherein the unrequired molded part of the margin 18 is cut to expose the specularize the focusing plane 11.
JP14848779A 1979-11-16 1979-11-16 Manufacture of prism Pending JPS5672932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14848779A JPS5672932A (en) 1979-11-16 1979-11-16 Manufacture of prism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14848779A JPS5672932A (en) 1979-11-16 1979-11-16 Manufacture of prism

Publications (1)

Publication Number Publication Date
JPS5672932A true JPS5672932A (en) 1981-06-17

Family

ID=15453847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14848779A Pending JPS5672932A (en) 1979-11-16 1979-11-16 Manufacture of prism

Country Status (1)

Country Link
JP (1) JPS5672932A (en)

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