JPH0525081B2 - - Google Patents

Info

Publication number
JPH0525081B2
JPH0525081B2 JP59251859A JP25185984A JPH0525081B2 JP H0525081 B2 JPH0525081 B2 JP H0525081B2 JP 59251859 A JP59251859 A JP 59251859A JP 25185984 A JP25185984 A JP 25185984A JP H0525081 B2 JPH0525081 B2 JP H0525081B2
Authority
JP
Japan
Prior art keywords
lens
mold
fresnel lens
fresnel
lens portion
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.)
Expired - Lifetime
Application number
JP59251859A
Other languages
English (en)
Japanese (ja)
Other versions
JPS61130903A (ja
Inventor
Hisao Inage
Masao Takagi
Masayuki Muranaka
Norio Yatsuda
Kyoshi Wada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP59251859A priority Critical patent/JPS61130903A/ja
Publication of JPS61130903A publication Critical patent/JPS61130903A/ja
Publication of JPH0525081B2 publication Critical patent/JPH0525081B2/ja
Granted 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • B29L2011/005—Fresnel lenses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
JP59251859A 1984-11-30 1984-11-30 フレネルレンズとその製造方法 Granted JPS61130903A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59251859A JPS61130903A (ja) 1984-11-30 1984-11-30 フレネルレンズとその製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59251859A JPS61130903A (ja) 1984-11-30 1984-11-30 フレネルレンズとその製造方法

Publications (2)

Publication Number Publication Date
JPS61130903A JPS61130903A (ja) 1986-06-18
JPH0525081B2 true JPH0525081B2 (sv) 1993-04-09

Family

ID=17228980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59251859A Granted JPS61130903A (ja) 1984-11-30 1984-11-30 フレネルレンズとその製造方法

Country Status (1)

Country Link
JP (1) JPS61130903A (sv)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0267326U (sv) * 1988-11-10 1990-05-22
JP2901727B2 (ja) * 1990-09-19 1999-06-07 株式会社日立製作所 フレネルレンズ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125755A (sv) * 1974-03-19 1975-10-03
JPS5117452A (ja) * 1974-08-02 1976-02-12 Ichiro Hosaka Furenerurenzu
JPS52143847A (en) * 1976-05-26 1977-11-30 Mitsubishi Electric Corp Optical lens
JPS52145238A (en) * 1976-05-28 1977-12-03 Ichirou Hosaka Method of making mold for fresnel lens
JPS56140335A (en) * 1980-04-04 1981-11-02 Matsushita Electric Ind Co Ltd Transmission type projecting screen
JPS56142501A (en) * 1980-04-08 1981-11-06 Matsushita Electric Ind Co Ltd Fresnel lens sheet
JPS56144927A (en) * 1980-04-14 1981-11-11 Matsushita Electric Ind Co Ltd Manufacture of fresnel lens
US4456344A (en) * 1981-07-23 1984-06-26 A.T.B. S.P.A. Fresnel lens, and a method and mold for manufacturing it

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229148U (sv) * 1975-08-22 1977-03-01
JPS5389341U (sv) * 1976-12-22 1978-07-21

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125755A (sv) * 1974-03-19 1975-10-03
JPS5117452A (ja) * 1974-08-02 1976-02-12 Ichiro Hosaka Furenerurenzu
JPS52143847A (en) * 1976-05-26 1977-11-30 Mitsubishi Electric Corp Optical lens
JPS52145238A (en) * 1976-05-28 1977-12-03 Ichirou Hosaka Method of making mold for fresnel lens
JPS56140335A (en) * 1980-04-04 1981-11-02 Matsushita Electric Ind Co Ltd Transmission type projecting screen
JPS56142501A (en) * 1980-04-08 1981-11-06 Matsushita Electric Ind Co Ltd Fresnel lens sheet
JPS56144927A (en) * 1980-04-14 1981-11-11 Matsushita Electric Ind Co Ltd Manufacture of fresnel lens
US4456344A (en) * 1981-07-23 1984-06-26 A.T.B. S.P.A. Fresnel lens, and a method and mold for manufacturing it

Also Published As

Publication number Publication date
JPS61130903A (ja) 1986-06-18

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