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A technology for clocks and parts, applied in the field of clock parts and clocks, can solve problems such as failure to obtain corrosion resistance
Pending Publication Date: 2021-03-09
SEIKO EPSON CORP
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Therefore, there is a problem that the corrosion resistance required for a watch case may not be obtained.
Method used
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[0019] Hereinafter, a timepiece 1 according to an embodiment of the present invention will be described based on the drawings.
[0020] figure 1 It is a front view showing clock 1, figure 2 It is a figure showing the back cover of the clock. In the present embodiment, the timepiece 1 is configured to be worn on the wrist of the user.
[0021] like figure 1 , 2 As shown, the timepiece 1 includes a metal case 2 . The case 2 includes a cylindrical case body 21 and a rear cover 22 attached to an opening on the back side of the case body 21 . In addition, a disc-shaped dial 10 , a second hand 3 , a minute hand 4 , an hour hand 5 , a crown 7 , an A button 8 , and a B button 9 are provided inside the case body 21 . An hour mark 6 for indicating the time is provided on the dial 10 . In addition, the back cover 22 is an example of the timepiece component of this invention.
[0022] [back cover]
[0023] like figure 2 As shown, the rear cover 22 is formed with a model number...
Embodiment
[0065] A method of forming a recessed portion constituting a model number, a waterproof performance display, and a magnetic resistance display on the back cover of the timepiece component as an example by laserprocessing will be described.
[0066] First, a base material composed of ferritic stainless steel containing, in mass %, Cr: 20%, Mo: 2.1%, Nb: 0.2%, Cu: 0.1%, Ni: 0.05%, Mn: 0.5%, Si: 0.3%, P: 0.03%, S: 0.01%, N: 0.01%, C: 0.02%, the rest is composed of Fe and inevitable impurities, and the base material is subjected to nitrogen absorption treatment to obtain a A metallic material with an austenitized surface layer. Then, the metal material is processed to manufacture the back cover.
[0067] Next, laserprocessing is performed on the surface of the rear cover manufactured as described above, that is, the surface on the side exposed when the rear cover is attached to the case body, to form recesses constituting the model number, waterproof performance display, and ma...
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Abstract
The invention provides a timepiece component and a timepiece. Corrosion resistance can be ensured, and marks for identifying watch marks and appearance design performance can be implemented. The timepiece component is formed of an austenitic-ferritic stainless steel including a base portion formed of a ferrite phase, a surface layer formed of an austenitic phase, and a mixed layer formed between the base portion and the surface layer and obtained by mixing the ferrite phase and the austenitic phase. A recessed portion is formed in the surface layer and a distance from a front surface of the surface layer to a bottom surface of the recessed portion is shorter than a distance from the front surface to the mixed layer.
Description
Technical field [0001] The present invention relates to timepiece components and timepieces. Background technique [0002] Patent Document 1 discloses a watch case using ferritic stainless steel whose surface layer is austenitized by nitrogen absorption treatment. Specifically, a main body and a back cover are disclosed. [0003] In Patent Document 1, by austenitizing the surface layer of ferritic stainless steel, it is possible to obtain the hardness and corrosion resistance required for a watch case. [0004] Patent Document 1: Japanese Patent Application Publication No. 2009-69049 [0005] In the timepiece case described in Patent Document 1, in order to provide an identification mark or design expression, a part of the case may be marked by, for example, laserprocessing. At this time, if a part of the marked portion penetrates the austenitizing phase and reaches the ferrite phase, the ferrite phase will be exposed through the marked portion. Therefore, there is a pro...
Claims
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Application Information
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