JP2006284235A - Wearing-on-arm type electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the receiving accuracy of an electronic device, and to miniaturize the whole device by making an antenna unit approach the inside of its case. <P>SOLUTION: A rear lid 6 fitted to the undersurface of the wrist watch case 1 made from synthetic resin having an antenna housing section 4 in its internal periphery section, is provided with a resin section 10 corresponding to the whole undersurface of the watch case 1, and a metal section 11 provided integrally with the resin section 10 excluding its corresponding part to an antenna unit 5 housed in the housing section 4 of the watch case 1. Accordingly, electronic waves from the underside of the watch case 1 can be taken in, since the metal section 11 of the rear lid 6 does not exist in its corresponding part to the underside of the antenna unit 5, even if the antenna unit 5 is housed in the housing section 4 of the watch case 1. Consequently, the whole device can be miniaturized since the antenna unit 5 can be made to approach the inside of the watch case 1, along with ensuring the receiving accuracy of the antenna unit 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an arm-mounted electronic device such as an electronic wristwatch, and more particularly to an arm-mounted electronic device including an antenna unit for GPS (global positioning system).

For example, in an electronic wristwatch, there is a radio timepiece with a built-in antenna unit. As described in Patent Document 1, this type of electronic wristwatch is provided with a band attaching portion protruding outward on the outer peripheral portion of a synthetic resin watch case, and an antenna housing portion is provided in the protruding band attaching portion. The antenna unit is housed in the antenna housing portion, and the upper side of the antenna unit is covered with a cover member made of synthetic resin.
JP 2002-98780 A

  However, in such a conventional electronic wristwatch, since a metal back cover is attached to the lower surface of the watch case, the antenna unit is arranged in a state of projecting outside the watch case from the outer periphery of the back cover. Otherwise, the antenna unit cannot receive radio waves from below the watch case. For this reason, it is necessary to make the band mounting part protrude greatly outside the watch case and to form the antenna housing part for housing the antenna unit outside the outer peripheral part of the back cover. Occurs.

  The problem to be solved by the present invention is to provide an arm-mounted electronic device capable of ensuring reception accuracy and reducing the size of the entire device by bringing the antenna unit closer to the inside of the case.

In order to solve the above problems, the present invention includes the following components.
In addition, the reference numerals of the drawings attached to the respective elements described in the section of each embodiment described later are attached to the respective constituent elements together with parentheses.

As shown in FIGS. 1 to 10, the invention according to claim 1 is a synthetic resin case (watch case 1) detachably attached to an arm, and an antenna formed on the inner periphery of the case. An antenna unit (5) housed in the housing part (4), and a back cover (6, 15, 20) attached to the lower surface of the case;
The back cover includes a resin part (10, 16, 22) corresponding to the entire lower surface of the case and a metal part (11, 17) provided integrally with the resin part except for a part corresponding to the antenna unit. 23), and an arm-mounted electronic device.

1 to 4, the antenna unit (5) and the metal part (11) of the back cover (6) are arranged at the inner end on the lower surface of the antenna unit. When the angle at which the straight line (S) connecting the outer end of the metal part intersects the lower surface of the antenna unit is θ,
θ ≧ 30 °
The arm-mounted electronic device according to claim 1, wherein the relationship is set as follows.

  As shown in FIGS. 5 to 10, the invention according to claim 3 corresponds to the metal part (17) of the back cover (15) and an opening (18) corresponding to the antenna unit (5). The wrist-worn electronic device according to claim 1, wherein the arm-mounted electronic device is provided.

  As for invention of Claim 4, as shown in FIGS. 1-3, FIGS. 5-7, and FIG. 10, the said metal part (11,17,23) is the said resin part (10,16,) by insert molding. The arm-mounted electronic device according to any one of claims 1 to 3, wherein the electronic device is integrally formed with the electronic device 22).

  According to the fifth aspect of the present invention, as shown in FIGS. 4, 8, and 9, the metal parts (11, 17) are fitted and integrated into the resin parts (10, 16). The arm-mounted electronic device according to any one of claims 1 to 3.

  As shown in FIGS. 1 to 9, the invention according to claim 6 is a positioning portion for positioning the antenna unit (5) in the antenna housing portion (4) of the case (watch case 1). The arm-mounted electronic device according to any one of claims 1 to 5, further comprising a (positioning protrusion 8a).

  According to the seventh aspect of the present invention, as shown in FIG. 10, an antenna pressing portion (21) for positioning and pressing the lower portion of the antenna unit (5) is formed on the resin portion (22). The wrist-worn electronic device according to any one of claims 1 to 5.

  According to the first aspect of the present invention, the back cover attached to the lower surface of the synthetic resin case having the antenna housing portion formed on the inner peripheral portion includes the resin portion corresponding to the entire lower surface of the case, The metal part of the back cover corresponds to the lower side of the antenna unit because the metal part is provided integrally with the resin part except for the part corresponding to the antenna unit housed in the antenna housing part. Does not exist in the part. For this reason, even if the antenna unit is housed in the antenna housing part formed on the inner periphery of the case, the antenna unit is not affected by the metal part of the back cover and can receive radio waves from the lower side of the case well. can do. Thereby, the reception accuracy of the antenna unit can be ensured, and the antenna unit can be disposed close to the inside of the case, so that the entire device can be downsized.

  According to the second aspect of the present invention, the antenna unit and the metal part of the back cover are such that a straight line connecting the inner end part and the outer end part of the metal part intersects the lower surface of the antenna unit. When the angle to be set is θ, by setting the relationship θ ≧ 30 °, it is possible to minimize the influence of the metal part of the back cover when receiving radio waves from below the case. Radio waves from obliquely below the back cover can be reliably and satisfactorily received by the antenna unit, whereby the reception accuracy of the antenna unit can be ensured.

  According to the third aspect of the present invention, since the opening portion is provided in the metal portion of the back cover corresponding to the antenna unit, the outer peripheral end portion of the metal portion is disposed outside the antenna unit. However, the antenna unit can receive the radio wave from the lower side of the case through the opening formed in the metal portion, and the reception accuracy of the antenna unit can be ensured.

  According to invention of Claim 4, even if the back cover is comprised by the resin part and the metal part by the metal part of a back cover being integrally formed in the resin part by insert molding, a back cover Can be easily manufactured, the number of parts is not increased, and the assembly work is not complicated, so that a low-priced product can be obtained.

  According to the fifth aspect of the present invention, even if the resin part and the metal part of the back cover are formed separately because the metal part is fitted into the resin part and integrated, the resin part is made of metal. By simply fitting the part, the resin part and the metal part can be easily integrated, and this also does not complicate the assembling work, and an inexpensive product can be obtained.

  According to the sixth aspect of the invention, the antenna unit includes a positioning portion for positioning in the antenna housing portion of the case, and the positioning is performed in a state where the antenna unit is floated in the antenna housing portion by the positioning portion. Therefore, it is possible to provide an air space with the lowest dielectric constant around the antenna unit, which can further improve the reception accuracy of the antenna unit, and that the antenna unit is floating in the antenna housing. As a result, an external impact is not directly applied to the antenna unit, so that a high impact resistance can be obtained.

  According to the seventh aspect of the present invention, the antenna pressing portion is formed on the resin portion so as to position and press the lower portion of the antenna unit. The unit can be assembled accurately and satisfactorily without being deformed, and the antenna unit can be assembled in a state where it is floated in the antenna housing portion of the case by the antenna pressing portion. Further, the receiving accuracy of the antenna unit can be further increased, and an impact from the outside is not directly applied to the antenna unit, so that a high impact resistance can be obtained.

(Embodiment 1)
A first embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIGS.
1 is a perspective view showing an essential part of an electronic wristwatch to which the present invention is applied, FIG. 2 is an enlarged cross-sectional view taken along the line A-A, and FIG. 3 is a perspective view showing the antenna unit of FIG.
As shown in FIG. 1, this electronic wristwatch includes a wristwatch case 1 made of synthetic resin. The wristwatch case 1 is provided with a band attaching portion 1a on the 12 o'clock side and the 6 o'clock side, and is detachably attached to the arm by a watch band (not shown) attached to the band attaching portion 1a. Has been.

  As shown in FIG. 2, a watch glass 2 is mounted on the upper part of the watch case 1. In addition, the watch case 1 contains a watch module 3 and an antenna storage portion on the inner peripheral surface of the watch case 1 located on the 12 o'clock side (the inner peripheral surface located on the right side in FIG. 2). 4 is formed, and an antenna unit 5 for GPS (Global Positioning System) is housed in the antenna housing 4. Further, a back cover 6 is attached to the lower part of the watch case 1 via a waterproof ring 7.

  In this case, the clock module 3 includes various electronic components necessary for the clock function and GPS, and is configured to display time information as well as GPS information based on radio wave information received by the antenna unit 5. ing. The antenna unit 5 is an ultra-small chip dielectric antenna. As shown in FIGS. 2 and 3, a holding member 8 made of a synthetic resin dielectric such as ABS resin, and an outer surface of the holding member 8 are provided. The entire unit is formed in a chip shape. That is, as shown in FIG. 2, the holding member 8 is formed in a substantially trapezoidal shape in which an inclined surface is formed at an upper corner portion having a rectangular cross section.

  Further, as shown in FIG. 3, the holding member 8 is provided with positioning protrusions 8a on both side surfaces thereof by notches 8b, and the positioning protrusions 8a are formed on the inner surface of the antenna housing part 4 as shown in FIG. By being inserted into the mounting recess 4a provided on the antenna housing 4, the antenna housing 4 is mounted in a floating state. The electrode portion 9 is made of a copper-based metal thin plate, is provided over the upper surface and the inclined surface of the holding member 8, and is also provided on the lower surface of the holding member 8 at a predetermined interval. Is configured to receive radio waves from outside, that is, above, on the side, and below the wristwatch case 1.

  On the other hand, as shown in FIG. 2, the back cover 6 includes a resin portion 10 corresponding to the entire lower surface of the watch case 1 and a metal portion provided integrally with the resin portion 10 except for a portion corresponding to the antenna unit 5. 11. As shown in FIG. 2, the resin portion 10 is positioned on the inner side (upper side in FIG. 2) and is pressed against the lower surface of the watch case 1, thereby pressing the waterproof ring 7 against the watch case 1 so as to be waterproof. It is configured. For this reason, it is desirable that the resin portion 10 is formed of a hard resin, for example, a reinforced resin containing glass fibers. Moreover, the metal part 11 has a shield function for preventing static electricity from a human body such as an arm, and is integrally formed with the resin part 10 by insert molding.

In this case, the metal part 11 of the back cover 6 and the antenna unit 5 are such that a straight line S connecting the inner end part of the lower surface of the antenna unit 5 and the outer end part of the metal part 11 intersects the lower surface of the antenna unit 5. When the angle is θ,
θ ≧ 30 °
The angle [theta] is preferably in the range of 45 [deg.] To 90 [deg.], Particularly around 60 [deg.]. As a result, the back cover 6 is configured to avoid as much as possible radio interference caused by the metal part 11 positioned below the antenna unit 5.

  According to such an electronic wristwatch, the antenna housing portion 4 is formed on the inner periphery of the synthetic resin wristwatch case 1 and the chip-shaped antenna unit 5 is housed in the antenna housing portion 4. In addition, the back cover 6 attached to the lower surface of the watch case 1 has a resin portion 10 corresponding to the entire lower surface of the watch case 1, and a wristwatch. Since the structure includes the metal portion 11 provided integrally with the resin portion 10 except for the portion corresponding to the antenna unit 5 housed in the antenna housing portion 4 of the case 1, static electricity from a human body such as an arm. The metal part 11 of the back cover 6 having a shield function for preventing the occurrence of the problem hardly exists in the part corresponding to the lower side of the antenna unit 5.

  For this reason, even if the antenna unit 5 is housed in the antenna housing part 4 formed on the inner periphery of the watch case 1, the antenna unit 5 is not affected by the metal part 11 of the back cover 6, and Can receive radio waves from below. As a result, the receiving accuracy of the antenna unit 5 can be increased, and the antenna unit 5 can be disposed close to the inside of the wristwatch case 1, so that the entire wristwatch can be reduced in size.

  In this case, in particular, the antenna unit 5 and the metal portion 11 of the back cover 6 have a straight line S connecting the inner end portion of the lower surface of the antenna unit 5 and the outer end portion of the metal portion 11 intersecting the lower surface of the antenna unit 5. The angle θ is set to θ ≧ 30 °, and the angle θ is preferably in the range of 45 ° to 90 °, particularly around 60 °, so that the watch case 1 can be viewed from below. When receiving radio waves, the influence of the metal part 11 of the back cover 6 can be minimized, so that the antenna unit 5 can reliably and satisfactorily receive radio waves from obliquely below the back cover 6. .

  Further, the back cover 6 is made of a hard resin such as a reinforced resin containing glass fiber so that the resin portion 10 that is in pressure contact with the lower surface of the watch case 1 is pressed against the watch case 1 for waterproofness. In addition, since the metal part 11 is formed integrally with the resin part 10 by insert molding, the back cover 6 can be easily formed even if the back cover 6 is composed of the resin part 10 and the metal part 11. In addition, the number of parts does not increase and the assembly work does not become complicated, so that a low-priced product can be obtained.

  Further, in the antenna unit 5, a positioning protrusion 8 a is provided on a holding member 8 made of a synthetic resin dielectric provided with an electrode portion 9, and the positioning protrusion 8 a is provided on the antenna housing portion 4. Since the antenna unit 5 is placed in a floating state in the antenna housing portion 4, an air space having the lowest dielectric constant can be provided around the antenna unit 5. The accuracy can be improved, and since the antenna unit 5 is floated in the antenna housing portion 4, no external impact is directly applied to the antenna unit 5, so that a high impact resistance can be obtained. Can do.

  In the first embodiment, the case where the metal part 11 of the back cover 6 is integrally formed with the resin part 10 by insert molding is described. However, the present invention is not limited to this, and for example, FIG. 4 (a) and FIG. 4 (b). As shown in the modification, the resin part 10 and the metal part 11 of the back cover 6 may be formed separately, and the metal part 11 may be fitted into the resin part 10 and integrated. If comprised in this way, even if the resin part 10 and the metal part 11 of the back cover 6 are formed separately, the resin part 10 and the metal part 11 can be easily attached only by fitting the metal part 11 into the resin part 10. Can be integrated, so that the assembling work is not complicated and a low-priced one can be obtained.

(Embodiment 2)
Next, a second embodiment in which the present invention is applied to an electronic wristwatch will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS. 1-3.
In this electronic wristwatch, the back cover 15 has a configuration different from that of the first embodiment, and the other configuration is substantially the same as that of the first embodiment.

  That is, the back cover 15 includes a resin portion 16 corresponding to the entire lower surface of the watch case 1 and a metal portion 17 provided integrally with the resin portion 16. In this case, the metal part 17 has a shielding function for preventing static electricity from a human body such as an arm, as in the first embodiment, and the metal part 17 includes, as shown in FIGS. An opening 18 is provided corresponding to the lower side of the antenna unit 5. As a result, as shown in FIG. 5 and FIG. 6, the back cover 15, when the metal part 17 is insert-molded, the end part on the opening part 18 side of the metal part 17 is wrapped with the resin part 16. The portion 17 is formed integrally with the resin portion 16.

  According to such an electronic wristwatch, similarly to the first embodiment, the antenna unit 5 can satisfactorily receive radio waves from the outside of the watch case 1 above and to the sides, and in particular, the metal portion 17 of the back cover 15. Since the opening 18 is provided in correspondence with the antenna unit 5, even if the outer peripheral end of the metal part 17 is disposed outside the antenna unit 5, the opening 18 is formed through the opening 18 formed in the metal part 17. The antenna unit 5 can receive radio waves from the lower side of the watch case 1.

  For this reason, the receiving accuracy of the antenna unit 5 can be ensured, and the antenna unit 5 can be disposed close to the inside of the wristwatch case 1, so that the entire wristwatch can be reduced in size. Also in this case, since the metal part 17 of the back cover 15 is integrally formed with the resin part 16 by insert molding, the back cover 15 is constituted by the resin part 16 and the metal part 17 as in the first embodiment. Even if it is done, the back cover 15 can be easily manufactured, the number of parts does not increase, and the assembling work does not become complicated, so that a low price can be obtained.

  In the second embodiment, the case where the metal portion 17 of the back cover 15 is formed integrally with the resin portion 16 by insert molding has been described. However, the present invention is not limited to this, and for example, the modification shown in FIGS. In addition, the metal portion 17 may be fitted and integrated with the resin portion 16 of the back cover 15. In this case, a fitting protrusion 16 a may be formed on the lower surface of the resin portion 16, and the fitting protrusion 16 a may be configured to fit into the opening 18 of the metal portion 17.

  If comprised in this way, even if the resin part 16 and the metal part 17 of the back cover 15 are formed separately, as shown to Fig.9 (a) and FIG.9 (b), the fitting protrusion of the resin part 16 is carried out. Since the resin part 16 and the metal part 17 can be easily integrated simply by fitting the part 16a into the opening 18 of the metal part 17 and fitting the metal part 17 into the resin part 16, the embodiment As in the first modification, the assembly work is not complicated, and a low-priced product can be obtained.

(Embodiment 3)
Next, a third embodiment in which the present invention is applied to an electronic wristwatch will be described with reference to FIG. In this case, the same portions as those in the second embodiment shown in FIGS.
This electronic wristwatch has a configuration in which an antenna pressing portion 21 is provided on the back cover 20 for positioning and pressing the antenna unit 5, and the other configuration is substantially the same as in the second embodiment. Similar to the second embodiment, the back cover 20 includes a resin portion 22 corresponding to the entire lower surface of the watch case 1, and a metal portion 23 formed integrally with the resin portion 22 by insert molding.

  Also in this case, the metal part 23 is provided with an opening 24 corresponding to the lower side of the antenna unit 5. Similarly to the second embodiment, the resin portion 22 is formed by wrapping the end portion on the opening 24 side of the metal portion 23 when the metal portion 23 for preventing static electricity from the human body such as an arm is insert-molded. It is formed integrally with the part 23. An antenna pressing portion 21 is integrally formed on the upper surface of the resin portion 22. As shown in FIG. 10, the antenna pressing portion 21 is formed to be one step higher than the pedestal on which the antenna unit 5 is placed, and is arranged in a pedestal recess 1 b formed on the lower surface of the watch case 1. ing.

  Incidentally, as shown in FIG. 10, the antenna unit 5 disposed on the antenna pressing portion 21 is provided with a positioning boss 25 on the lower surface of the synthetic resin holding member 8, and the positioning boss 25 is formed on the antenna pressing portion 21. It is configured to be inserted and positioned in the provided positioning recess 26. The antenna unit 5 is also provided with a positioning boss 27 on the upper surface of the holding member 8, and the positioning boss 27 is inserted into a positioning recess 28 provided on the inner surface of the watch case 1, that is, on the inner surface of the antenna housing portion 4. It is configured to be positioned.

  According to such an electronic wristwatch, there is an effect similar to that of the second embodiment, and in particular, since the antenna pressing portion 21 is formed to position and hold the antenna unit 5 on the resin portion 22 of the back cover 20. When the back cover 20 is attached to the lower surface of the case 1, the antenna holding unit 21 can accurately assemble the antenna unit 5 into the antenna housing unit 4 without deforming the antenna unit 5.

  That is, at this time, the positioning boss 25 provided on the lower surface of the holding member 8 of the antenna unit 9 is inserted into the positioning recess 26 provided on the antenna holding unit 21 for positioning, and provided on the upper surface of the holding member 8. By positioning the positioning boss 27 into the positioning recess 28 provided on the inner surface of the wristwatch case 1, the antenna unit 5 can be accurately incorporated into the antenna housing portion 4 by the antenna pressing portion 21, and the antenna unit 5 can be assembled in a state of floating in the antenna housing 4 of the watch case 1.

  For this reason, also in this antenna unit 5, as in the first embodiment, an air space having the lowest dielectric constant can be provided around the antenna unit 5, and this can also improve the reception accuracy of the antenna unit 5. In addition, since the antenna unit 5 is floated in the antenna housing portion 4, external impact is not directly applied to the antenna unit 5, so that a high impact resistance can be obtained.

  In the first to third embodiments and the modifications thereof, the case where the present invention is applied to an electronic wristwatch has been described. Can be applied.

It is the perspective view which showed the principal part of the electronic wristwatch to which this invention is applied. (Embodiment 1) It is an expanded sectional view in the AA arrow of FIG. It is the perspective view which showed the antenna unit of FIG. The modification of the back cover of Embodiment 1 is shown, (a) is an expanded sectional view of the principal part which decomposed | disassembled the resin part and metal part of the back cover, (b) is the state which inserted the metal part in the resin part It is an expanded sectional view of the important section showing. It is the expanded sectional view which showed the principal part of the electronic wristwatch to which this invention is applied. (Embodiment 2) FIG. 6 is a perspective view showing the back cover of FIG. It is the perspective view which showed only the metal part of the back cover of FIG. FIG. 6 is an enlarged cross-sectional view of a main part showing a modification of the electronic wristwatch of Embodiment 2. 8 shows the back cover of FIG. 8, (a) is an enlarged cross-sectional view of a main part obtained by disassembling the resin part and the metal part of the back cover, and (b) is a main part showing a state where the metal part is fitted into the resin part. It is an expanded sectional view of a part. It is the expanded sectional view which showed the principal part of the electronic wristwatch to which this invention is applied. (Embodiment 3)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Watch case 2 Watch glass 3 Watch module 4 Antenna accommodating part 5 Antenna unit 6, 15, 20 Back cover 8 Holding member 8a Positioning projection part 9 Electrode part 10, 16, 22 Resin part 11, 17, 23 Metal part 18, 24 Opening 21 Antenna holding part

Claims (7)

A case made of a synthetic resin that is detachably attached to the arm, an antenna unit housed in an antenna housing portion formed on the inner periphery of the case, and a back cover attached to the lower surface of the case,
The back cover includes a resin portion corresponding to the entire lower surface of the case and a metal portion provided integrally with the resin portion except for a portion corresponding to the antenna unit. Wearable electronic equipment. The angle between the antenna unit and the metal part of the back cover that intersects the straight line connecting the inner end of the lower surface of the antenna unit and the outer end of the metal unit with respect to the lower surface of the antenna unit is θ. When
θ ≧ 30 °
The arm-mounted electronic device according to claim 1, wherein the relationship is set as follows.   The arm-mounted electronic device according to claim 1, wherein an opening is provided in the metal part of the back cover corresponding to the antenna unit.   The arm-mounted electronic device according to claim 1, wherein the metal part is integrally formed with the resin part by insert molding.   The arm-mounted electronic device according to claim 1, wherein the metal part is fitted into and integrated with the resin part.   The arm-mounted electronic device according to claim 1, wherein the antenna unit includes a positioning unit for positioning in the antenna housing unit of the case.   The arm-mounted electronic device according to any one of claims 1 to 5, wherein an antenna pressing portion for positioning and pressing a lower portion of the antenna unit is formed in the resin portion.

Images