JPS55161621A - Manufacture of concave mirror - Google Patents

Manufacture of concave mirror

Info

Publication number
JPS55161621A
JPS55161621A JP6900279A JP6900279A JPS55161621A JP S55161621 A JPS55161621 A JP S55161621A JP 6900279 A JP6900279 A JP 6900279A JP 6900279 A JP6900279 A JP 6900279A JP S55161621 A JPS55161621 A JP S55161621A
Authority
JP
Japan
Prior art keywords
concave
plate
mold
thermoplastic resin
concave mirror
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
JP6900279A
Other languages
Japanese (ja)
Inventor
Nagahiro Shibakusa
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.)
Sumitomo Bakelite Co Ltd
Original Assignee
Sumitomo Bakelite 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 Sumitomo Bakelite Co Ltd filed Critical Sumitomo Bakelite Co Ltd
Priority to JP6900279A priority Critical patent/JPS55161621A/en
Publication of JPS55161621A publication Critical patent/JPS55161621A/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
    • B29D11/00596—Mirrors

Abstract

PURPOSE:To enable the production of large-sized concave mirrors at a low cost, by a method wherein a concave plate is formed at a given temperature using a mold having a given surface coarseness after preheating a plate of a thermoplastic resin at a given temperature, and Al or Cr is electrodeposited thereon. CONSTITUTION:A plate of a thermoplastic resin is preheated at a temperature higher than a thermal deformation point or lower than a melting point thereof. A concave plate is formed by a direct pressure at a mold temperature of 20-40 deg.C lower than the thermal deformation point of the resin by the use of a convex upper mold, whose surface coarseness is 0.1S or less, and a concave mold having an optional surface coarseness. Al or Cr 1,000-9,000Angstrom in thickness is electrodeposited on the inside of the concave sheet to produce a concave mirror. A resin plate of 2-15mm. in thickness, such as polymethylmetaacrylate, polycarbonate, polyethylene, etc., are used for the production of the thermoplastic resin plate. From the economical viewpoint, a suitable size of the concave mirror available is 200- 500mm.phi.
JP6900279A 1979-06-04 1979-06-04 Manufacture of concave mirror Pending JPS55161621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6900279A JPS55161621A (en) 1979-06-04 1979-06-04 Manufacture of concave mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6900279A JPS55161621A (en) 1979-06-04 1979-06-04 Manufacture of concave mirror

Publications (1)

Publication Number Publication Date
JPS55161621A true JPS55161621A (en) 1980-12-16

Family

ID=13389946

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6900279A Pending JPS55161621A (en) 1979-06-04 1979-06-04 Manufacture of concave mirror

Country Status (1)

Country Link
JP (1) JPS55161621A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016752A1 (en) * 1995-11-01 1997-05-09 Bakelite Ag Reflector, and method and means for its production
EP1335214A1 (en) * 2000-10-20 2003-08-13 Mitsubishi Chemical Corporation Projection lens
WO2021223947A1 (en) 2020-05-08 2021-11-11 Covestro Deutschland Ag Thermoplastic resin substrate for curved mirror and method for preparing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016752A1 (en) * 1995-11-01 1997-05-09 Bakelite Ag Reflector, and method and means for its production
EP1335214A1 (en) * 2000-10-20 2003-08-13 Mitsubishi Chemical Corporation Projection lens
EP1335214A4 (en) * 2000-10-20 2007-02-28 Mitsubishi Chem Corp Projection lens
WO2021223947A1 (en) 2020-05-08 2021-11-11 Covestro Deutschland Ag Thermoplastic resin substrate for curved mirror and method for preparing the same

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