JPS55144201A - Cylindrical reflecting mirror and its production - Google Patents

Cylindrical reflecting mirror and its production

Info

Publication number
JPS55144201A
JPS55144201A JP5317979A JP5317979A JPS55144201A JP S55144201 A JPS55144201 A JP S55144201A JP 5317979 A JP5317979 A JP 5317979A JP 5317979 A JP5317979 A JP 5317979A JP S55144201 A JPS55144201 A JP S55144201A
Authority
JP
Japan
Prior art keywords
die
blank
convex parts
quadrangular pyramidal
outside
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
JP5317979A
Other languages
Japanese (ja)
Inventor
Takasue Noda
Masashi Habu
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP5317979A priority Critical patent/JPS55144201A/en
Publication of JPS55144201A publication Critical patent/JPS55144201A/en
Pending legal-status Critical Current

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  • Optical Elements Other Than Lenses (AREA)

Abstract

PURPOSE: To let the light of a lamp be effectively reflected by providing a multiplicity of quadrangular pyramidal protrusions in close contact with each other on the inside wall surface of a hollow cylindrical reflecting plate blank with their peak parts being directed to the cylindrical axis direction.
CONSTITUTION: A hollow cylindrical reflecting blank 17 is put between a roll-form outside die 11 provided with quadrangular pyramidal convex parts 12 on the outside circumferential surface of a cylinderical body and a roll-form inside die 14 provided with quadrangular pyramidal concave parts 15 opposing to the convex parts 12 of the outside die 11, with the inside die 14 being brought to the inner side of the blank 17. While the inside die 14 and outside die 11 are being pressure contacted, their shafts 13, 16 are revolved synchronously, by which the quadrangular pyramidal protrusions protruding toward the inner side are made on the inside circumferential surface of the blank 17. The cylindrical reflecting plate 5 thus obtained is put on a cylindrical lamp 3 so that the reflection efficiency of the light reflecting downward is improved. With the reflecting plate 5 which is relatively low in the height of the convex parts 12, it is also possible to use the circular-tube-form rubber which is not provided with convex parts on the inside die.
COPYRIGHT: (C)1980,JPO&Japio
JP5317979A 1979-04-28 1979-04-28 Cylindrical reflecting mirror and its production Pending JPS55144201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5317979A JPS55144201A (en) 1979-04-28 1979-04-28 Cylindrical reflecting mirror and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5317979A JPS55144201A (en) 1979-04-28 1979-04-28 Cylindrical reflecting mirror and its production

Publications (1)

Publication Number Publication Date
JPS55144201A true JPS55144201A (en) 1980-11-11

Family

ID=12935632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5317979A Pending JPS55144201A (en) 1979-04-28 1979-04-28 Cylindrical reflecting mirror and its production

Country Status (1)

Country Link
JP (1) JPS55144201A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011051018A (en) * 2010-10-07 2011-03-17 Universal Seikan Kk Can body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115163A (en) * 1974-02-09 1975-09-09
JPS5370589A (en) * 1976-12-07 1978-06-23 Iwasaki Electric Co Ltd Illuminator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115163A (en) * 1974-02-09 1975-09-09
JPS5370589A (en) * 1976-12-07 1978-06-23 Iwasaki Electric Co Ltd Illuminator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011051018A (en) * 2010-10-07 2011-03-17 Universal Seikan Kk Can body

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