JPS578121A - Molding method of flat lens - Google Patents

Molding method of flat lens

Info

Publication number
JPS578121A
JPS578121A JP8274480A JP8274480A JPS578121A JP S578121 A JPS578121 A JP S578121A JP 8274480 A JP8274480 A JP 8274480A JP 8274480 A JP8274480 A JP 8274480A JP S578121 A JPS578121 A JP S578121A
Authority
JP
Japan
Prior art keywords
lens
molded
flat
holding plate
bodies
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
JP8274480A
Other languages
Japanese (ja)
Inventor
Kiyokazu Shibusawa
Hidenori Ito
Isamu Sugasawa
Shoichi Ebara
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 JP8274480A priority Critical patent/JPS578121A/en
Publication of JPS578121A publication Critical patent/JPS578121A/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
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0022—Multi-cavity moulds
    • 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

Landscapes

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

Abstract

PURPOSE:To prevent flare or the like as well as to obtain a flat lens for condensing light, excellent in the image-focusing performance and having an extremely short focal length, by a method wherein a plurality of lens unit bodies made of a transparent resin are implanted in a holding plate molded by using an opaque resin. CONSTITUTION:For example, an opaque resin material is injection-molded to form a flat-lens holding plate 31. Then, spiderlike lens bodies 32 molded by injection molding or the like are fitted into the fitting parts, provided in the lens holding plate 31, having the same shape as the spiderlike lens bodies 32 and then united together by bonding or the like. Moreover, the connecting rib part 33 of the lens bodies is painted with black ink or printed to prevent reflection and scattering. Thus, flat lenses are obtained. USE:For the exposure through the slit of a copying machine.
JP8274480A 1980-06-20 1980-06-20 Molding method of flat lens Pending JPS578121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8274480A JPS578121A (en) 1980-06-20 1980-06-20 Molding method of flat lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8274480A JPS578121A (en) 1980-06-20 1980-06-20 Molding method of flat lens

Publications (1)

Publication Number Publication Date
JPS578121A true JPS578121A (en) 1982-01-16

Family

ID=13782925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8274480A Pending JPS578121A (en) 1980-06-20 1980-06-20 Molding method of flat lens

Country Status (1)

Country Link
JP (1) JPS578121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0787567A2 (en) * 1996-01-31 1997-08-06 Matsushita Electric Industrial Co., Ltd Method for making optical preforms and optical elements by press molding
US6007746A (en) * 1996-11-11 1999-12-28 Matsushita Electric Industrial Co., Ltd. Method for manufacturing preforms used in molding optical elements and method for manufacturing and molding optical elements

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0787567A2 (en) * 1996-01-31 1997-08-06 Matsushita Electric Industrial Co., Ltd Method for making optical preforms and optical elements by press molding
EP0787567A3 (en) * 1996-01-31 1998-07-15 Matsushita Electric Industrial Co., Ltd Method for making optical preforms and optical elements by press molding
US5965069A (en) * 1996-01-31 1999-10-12 Matsushita Electric Industrial Co., Ltd. Method for making optical preforms and optical elements by press
US6007746A (en) * 1996-11-11 1999-12-28 Matsushita Electric Industrial Co., Ltd. Method for manufacturing preforms used in molding optical elements and method for manufacturing and molding optical elements

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