Electronic device having metal package unit having built-in antenna unit

Abstract

An electronic device comprises at least an antenna, an information processing apparatus for the purpose of processing information captured by the antenna, and a metal exterior parts capable of housing therewithin the antenna and the information processing apparatus, wherein the metal exterior parts is configured so that the antenna can receive magnetic flux from outside the metal exterior parts that has passed through the metal exterior parts and can resonate, and wherein at least a part of the metal exterior parts has an electrical resistance value that is different from another part of the metal exterior parts.

Description

technical field [0001] The present invention relates to an electronic device having functions of receiving a radio signal, transmitting prescribed information (including time information), and displaying or giving a notice on the displayed prescribed information, and correcting the time information into accurate time information. More particularly, the present invention relates to an electronic device in which a metal exterior member, such as a metal case, is used and has improved radio signal reception. [0002] Further, more specifically, the present invention relates to an electronic device configured such that its antenna performance for receiving radio signals is improved even if a resonant antenna is placed near a metal object or placed in a metal outer part. No deterioration, or more specifically, the present invention relates to a radio-controlled timepiece in which the antenna is disposed in a metal outer part. Background technique [0003] In recent years, many e...

AI Technical Summary

Problems solved by technology

[0026] However, in this case, the shape of the final timepiece is very specific, and there is a problem that severely limits the final timepiece design

[0027] In addition, since the shell 103 and the antenna box 110 are made of high polymer resin, and the antenna is sealed inside the shell 103 and the antenna box 110, the texture of the shell 103 and the antenna box 110 is very large, so it is difficult to adapt to the design , the problem is that its design will inevitably become a design that is difficult for users to accept

With high polymer resins, for example, there is a tendency for plastic deformation to occur due to fastening of the back cover 104, therefore, there is a problem of watertightness of the junction between the back cover 104 and the housing 103, and there is another problem Yes, not possible to be included in the timepieces group of diver's watches with high water resistance

[0030] Although corresponding to the above, there is an actual product in which the case and the rear cover are formed of materials other than high polymer resin, such as ceramic-like non-metallic materials, which require sintering to maintain the ceramic Rigidity, the problem is that it cannot be processed accurately after sintering, or it cannot be polished into complex shapes

The problem with such timepieces is that if there is metal inside the ring part, a separate antenna from the timepiece would essentially have to be provided as reception would not be possible

However, this will cause the following problems: not only the manufacturing process is complicated, but also difficult to assemble during the manufacturing process

[0072] Furthermore, in a watch of this structure, if it is possible for the radio signal to reach the antenna, and the back cover is plated with a very thin metal plating layer to give the user the impression that the material used is metal, but in this way, the weight of the watch The texture and texture of the appearance loses its meaning, and the problem is that it loses the image of a high-quality timepiece

[0073] In addition, since the antenna is placed in the metal side wall, the output of the antenna is reduced and the reception performance is deteriorated

[0074] For this reason, it has been difficult to realize radio-controlled timepieces with all-metal exterior parts and a strong texture in the past

[0075] In order to solve these problems in the prior art, the present inventor has found out the problem in Japanese Patent Application 2001-297095: when the antenna is arranged in the closed space of the timepiece with the metal side wall or the metal back cover, the Q value decrease, resulting in a reduction in the output of the antenna structure and a significant deterioration in the reception performance

[0078] Obviously, the problem that occurs when the antenna resonates is that the magnetic field lines (magnetic flux) emitted from the magnetic core of the antenna part are pulled into the metal object, the magnetic field lines therein cause eddy currents, and the eddy currents attenuate the magnetic energy, thereby causing the problem that the output of the antenna part decreases, and also hinders the normal reception of

However, since the glass 23 is fixed to the peripheral frame 22 of the back cover 12, once the watch is subjected to a shock such as being dropped, there is a problem that the glass 23 breaks.

In addition, since the back cover 12 is in close contact with the wrist, sweat and the like may cause the glass 23 to drop from the peripheral frame 22 during long-term use, and therefore, there is the possibility that sweat, moisture, dust, etc. may invade the watch movement (antenna) 1. Obvious danger of radio-controlled watch receiver 2, CPU 3, display drive part 4, etc.), which will significantly reduce the function of the watch

[0080] In addition, since the back cover 12 is provided with the glass 23, in addition to increasing the number of components, there is also a problem of increasing the number of assembly steps and increasing the cost.

Due to the use of non-metallic materials for the exterior parts, the watch lacks a sense of weight, and there are problems in terms of high-quality feeling and attractive feeling

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