JPS57187223A - Plastic lens - Google Patents

Plastic lens

Info

Publication number
JPS57187223A
JPS57187223A JP7104881A JP7104881A JPS57187223A JP S57187223 A JPS57187223 A JP S57187223A JP 7104881 A JP7104881 A JP 7104881A JP 7104881 A JP7104881 A JP 7104881A JP S57187223 A JPS57187223 A JP S57187223A
Authority
JP
Japan
Prior art keywords
picture frame
lens
shaped
edge
pushout
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.)
Granted
Application number
JP7104881A
Other languages
Japanese (ja)
Other versions
JPH0254208B2 (en
Inventor
Kiyokazu Shibusawa
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 JP7104881A priority Critical patent/JPS57187223A/en
Publication of JPS57187223A publication Critical patent/JPS57187223A/en
Publication of JPH0254208B2 publication Critical patent/JPH0254208B2/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
    • 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
    • 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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain said lens which is free from bad influence to image building performance of projected picture even if optical strain is formed when it is molded by injection molding, by molding an outer periphery circle like and arranging an injection gate, the contacting part of a pushout pin etc. at the position opposite to the edge of a picture frame. CONSTITUTION:E.g. an outer periphery is shaped like a circle, and an injection gate part 3 is shaped at the outside of the arc of the crescent like part 1a of which the string is the longer edge of a rectangular picture frame 2 and on the center line Y dividing the picture frame 2 into equal two parts right and left so as to be opposed to the longer edge of the picture frame 2 and a flow tub 4 is shaped at its antipode. Further by shaping the contacting parts 5 of pushout pins in mold release time at the outside of the arc of another crescent like part 1b and on the center line X dividing the picture frame 2 into equal two upper and lower parts so as to be opposed to the shorter edge of the picture frame 2 at the antipodes an aimed lens of which optical strain does not reach inside the picture frame 2 even if it is formed is obtained. Also, it is preferable that the lens is fitted to the predetermined position by using a lens fixing frame 10, because it is not shifted against the picture frame 2.
JP7104881A 1981-05-12 1981-05-12 Plastic lens Granted JPS57187223A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7104881A JPS57187223A (en) 1981-05-12 1981-05-12 Plastic lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7104881A JPS57187223A (en) 1981-05-12 1981-05-12 Plastic lens

Publications (2)

Publication Number Publication Date
JPS57187223A true JPS57187223A (en) 1982-11-17
JPH0254208B2 JPH0254208B2 (en) 1990-11-21

Family

ID=13449242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7104881A Granted JPS57187223A (en) 1981-05-12 1981-05-12 Plastic lens

Country Status (1)

Country Link
JP (1) JPS57187223A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664854A (en) * 1986-01-06 1987-05-12 Neolens, Inc. Injection molding equipment and method
JP2002200647A (en) * 2000-12-28 2002-07-16 Sony Corp Optical element, mold for optical element, and method for manufacturing optical element
JP2003104478A (en) * 2001-09-28 2003-04-09 Konica Corp Methods of storing, conveying, assembling and coating optical molding
JP2004219594A (en) * 2003-01-14 2004-08-05 Matsushita Electric Ind Co Ltd Lens system optical device
JP2005306011A (en) * 2004-03-25 2005-11-04 Ricoh Co Ltd Molding method of recording disc, molding apparatus for recording disc and mold for recording disc
JP2008273088A (en) * 2007-05-01 2008-11-13 Shin Etsu Polymer Co Ltd Method for manufacturing dicing frame, and dicing frame
JP2010012693A (en) * 2008-07-03 2010-01-21 Maxell Finetech Ltd Injection molding apparatus, method of ejecting molded article, and resin lens
JP2010105744A (en) * 2009-12-21 2010-05-13 Konica Minolta Holdings Inc Method for storing optical molded product, method for conveying optical molded product, method for assembling optical molded product and method for coating optical molded product
USRE41995E1 (en) 1994-08-29 2010-12-14 Enplas Corporation Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393850A (en) * 1977-01-25 1978-08-17 Pii Ueebaa Haaman Method and system of ejecting lens and lens blank

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393850A (en) * 1977-01-25 1978-08-17 Pii Ueebaa Haaman Method and system of ejecting lens and lens blank

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664854A (en) * 1986-01-06 1987-05-12 Neolens, Inc. Injection molding equipment and method
USRE41995E1 (en) 1994-08-29 2010-12-14 Enplas Corporation Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity
JP2002200647A (en) * 2000-12-28 2002-07-16 Sony Corp Optical element, mold for optical element, and method for manufacturing optical element
JP2003104478A (en) * 2001-09-28 2003-04-09 Konica Corp Methods of storing, conveying, assembling and coating optical molding
JP2004219594A (en) * 2003-01-14 2004-08-05 Matsushita Electric Ind Co Ltd Lens system optical device
JP4502581B2 (en) * 2003-01-14 2010-07-14 パナソニック株式会社 Lens system optical device
JP2005306011A (en) * 2004-03-25 2005-11-04 Ricoh Co Ltd Molding method of recording disc, molding apparatus for recording disc and mold for recording disc
JP2008273088A (en) * 2007-05-01 2008-11-13 Shin Etsu Polymer Co Ltd Method for manufacturing dicing frame, and dicing frame
JP2010012693A (en) * 2008-07-03 2010-01-21 Maxell Finetech Ltd Injection molding apparatus, method of ejecting molded article, and resin lens
JP2010105744A (en) * 2009-12-21 2010-05-13 Konica Minolta Holdings Inc Method for storing optical molded product, method for conveying optical molded product, method for assembling optical molded product and method for coating optical molded product

Also Published As

Publication number Publication date
JPH0254208B2 (en) 1990-11-21

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