JPS5724218A - Manufacture of large size fresnel lens - Google Patents

Manufacture of large size fresnel lens

Info

Publication number
JPS5724218A
JPS5724218A JP9846180A JP9846180A JPS5724218A JP S5724218 A JPS5724218 A JP S5724218A JP 9846180 A JP9846180 A JP 9846180A JP 9846180 A JP9846180 A JP 9846180A JP S5724218 A JPS5724218 A JP S5724218A
Authority
JP
Japan
Prior art keywords
mold
mold surface
large size
heating elements
mirror 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
JP9846180A
Other languages
Japanese (ja)
Inventor
Masao Horiguchi
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 JP9846180A priority Critical patent/JPS5724218A/en
Publication of JPS5724218A publication Critical patent/JPS5724218A/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
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00269—Fresnel lenses

Abstract

PURPOSE:To manufacture the large size Fresnel lenses by using the bottom part mold having mirror finish mold surface and the heating elements buried near the mold surface and the upper part mold having mirror finish mold surface and the heating elements buried near the mold surface. CONSTITUTION:The mold blocks A', B', C'... as the complementary molds are united to the base 3 and compose the bottom part mold 4. The mold surfaces a, b, c... are polished to mirror finish and the heating elements 5 are buried near the mold surface. The upper part mold 6 is made of planar glass and its mold surface is polished to mirror finish and the heating elements 8 are buried near the mold surface. A gasket 9 exists between the bottom part mold and the upper part mold and the thickness of the lenses is determined by the height of the gasket. The molded resin is made in the large size lenses shown in the figure.
JP9846180A 1980-07-18 1980-07-18 Manufacture of large size fresnel lens Pending JPS5724218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9846180A JPS5724218A (en) 1980-07-18 1980-07-18 Manufacture of large size fresnel lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9846180A JPS5724218A (en) 1980-07-18 1980-07-18 Manufacture of large size fresnel lens

Publications (1)

Publication Number Publication Date
JPS5724218A true JPS5724218A (en) 1982-02-08

Family

ID=14220330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9846180A Pending JPS5724218A (en) 1980-07-18 1980-07-18 Manufacture of large size fresnel lens

Country Status (1)

Country Link
JP (1) JPS5724218A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739455A (en) * 1971-04-05 1973-06-19 Humphrey Res Ass Method of making fresnelled optical element matrix
US3829536A (en) * 1971-04-05 1974-08-13 Humphrey Res Ass Method of forming an optical element of reduced thickness

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739455A (en) * 1971-04-05 1973-06-19 Humphrey Res Ass Method of making fresnelled optical element matrix
US3829536A (en) * 1971-04-05 1974-08-13 Humphrey Res Ass Method of forming an optical element of reduced thickness

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