JPS57104880A - Magnetism proof case of portable watch - Google Patents

Magnetism proof case of portable watch

Info

Publication number
JPS57104880A
JPS57104880A JP18175580A JP18175580A JPS57104880A JP S57104880 A JPS57104880 A JP S57104880A JP 18175580 A JP18175580 A JP 18175580A JP 18175580 A JP18175580 A JP 18175580A JP S57104880 A JPS57104880 A JP S57104880A
Authority
JP
Japan
Prior art keywords
outer middle
proof case
impart
portable watch
corrosion
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
JP18175580A
Other languages
Japanese (ja)
Inventor
Junichi Hayashi
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP18175580A priority Critical patent/JPS57104880A/en
Publication of JPS57104880A publication Critical patent/JPS57104880A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Abstract

PURPOSE:To impart the magnetism resisting effect by using a high permeability material for an inner middle and to impart corrosion resistance by an outer middle. CONSTITUTION:A middle is constituted by the inner middle 23 comprising pure iron or Permalloy and the thin outer middle 24 formed by drawing. The inner middle 23 and the outer middle 24 are bonded or welded. The material of the outer middle is highly corrosion resisting stainless steel which is generally used for cases and has corrosion resistance and appropriate hardness. By applying surface treatment such as nickel plating and gold plating on the inner middle 23, corrosion due to the infiltration of water, sweat, and the like through the gap between the outer middle 24 and a back 21 can be prevented. Synthetic resin can be used for said outer middle.
JP18175580A 1980-12-22 1980-12-22 Magnetism proof case of portable watch Pending JPS57104880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18175580A JPS57104880A (en) 1980-12-22 1980-12-22 Magnetism proof case of portable watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18175580A JPS57104880A (en) 1980-12-22 1980-12-22 Magnetism proof case of portable watch

Publications (1)

Publication Number Publication Date
JPS57104880A true JPS57104880A (en) 1982-06-30

Family

ID=16106314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18175580A Pending JPS57104880A (en) 1980-12-22 1980-12-22 Magnetism proof case of portable watch

Country Status (1)

Country Link
JP (1) JPS57104880A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002136251A (en) * 2000-11-02 2002-05-14 Shimano Inc Sound-producing apparatus of double bearing reel
CH710880A1 (en) * 2015-03-17 2016-09-30 Dchc Sa housing component for instrument sensitive to the effects of a magnetic field.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002136251A (en) * 2000-11-02 2002-05-14 Shimano Inc Sound-producing apparatus of double bearing reel
CH710880A1 (en) * 2015-03-17 2016-09-30 Dchc Sa housing component for instrument sensitive to the effects of a magnetic field.

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