JPH053446A - Band for wrist watch type radio equipment with antenna - Google Patents

Abstract

PURPOSE:To realize a metallic band for wrist watch type radio equipment in which shank processing by press is facilitated by forming a metallic band with an antenna plate incorporated thereto with a couple of antenna plates through a conductive center pick. CONSTITUTION:An outer case 1 is made of a conductive metallic material and a rear cover 8 made of the same material is screwed removably to the rear side of the case 1. An insulation layer 2 is made of an insulating synthetic rubber such as a polyurethane rubber or a silicone rubber and an antenna plate 3 made of a conductor hardly oxided is subject to insert forming to the inside of the layer 2. A connection terminal 4 made of a stainless steel material is welded to an end of the antenna plate 3 to be in electric continuity with a connector 5. Then the outer side of the insulation layer 2 is covered by a metallic band 6 and the band 6 is welded and screwed to a connection terminal 18 at its end to be in electric continuity with the case 1 and the rear cover 8. A spacer 17 made of a synthetic resin is inserted between the band 6 and a conductive center pick 7, and a loop antenna is formed to a couple of the antenna plates 3 through the center pick 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer appearance structure of a wristwatch type wireless device band in which an antenna is integrally incorporated. More specifically, the present invention relates to an external structure of a metal band that does not reduce the efficiency of the built-in antenna.

[0002]

2. Description of the Related Art An antenna band for a conventional wristwatch type radio is formed by integrally forming an antenna plate made of an insulating synthetic resin such as polyurethane rubber or silicon rubber and stainless steel which is difficult to oxidize. Built in. A clasp is provided at the end of the band on the 12 side when viewed from the dial, and is in conduction with the antenna plate. The exposed part of the antenna for conducting with Nakadome is opened at equal intervals on the human body contact surface of the 6 o'clock side band, and even if the length of the band is changed by sliding Nakadome, conduction between the antenna and Nakadome is achieved. Can be taken. The pair of bands is used to construct a loop antenna through a conductive clasp.

[0003]

Metals, leather, and synthetic resins are generally used as materials for wristwatch bands, but in consideration of the marketability, a high-class feeling, a degree of freedom in design, and a fit property and strength. In terms of the above, the metal band has excellent characteristics. In the prior art, as mentioned above, only the synthetic resin band was used. As a method of realizing a metallic band antenna, it is considered that the band and the antenna are formed of the same conductor, or that the antenna plate is covered with a synthetic resin and the synthetic resin is covered with a metal. The antenna efficiency η of the loop antenna is the radiation resistance Rr and the loss resistance Rl.
It is known from oss that it is expressed by the following equation.

Η = Rr / (Rr + Rloss) (1) Further, it is known that Rloss is expressed by the following equation by the specific resistance ρ of the antenna material, the effective area S of the antenna plate and the perimeter l of the loop antenna. .

Rloss = ρl / S (2) Therefore, it is necessary to keep Rloss constant in order not to reduce the antenna efficiency. If the perimeter of the antenna material and the band is constant, the effective area of the antenna plate cannot be changed from equation (2) in order to maintain the antenna efficiency. Therefore, since the length of the antenna plate is constant, the width cannot be changed. If the band and the antenna are formed of the same conductor and the above-mentioned conditions are satisfied, the metal band becomes a flat plate and the degree of freedom in design is impaired. Also, when the antenna plate is covered with metal, it is necessary to satisfy the conditions for inducing a voltage in the built-in antenna.

[0006]

In order to meet the above-mentioned problem of a metal band antenna capable of maintaining the antenna efficiency, the metal band antenna of the present invention has a metal band portion so that the antenna and a positive electrode of a power source are not electrically connected. The magnetic flux and the loop antenna are designed to intersect each other by providing an insulating portion between the antenna and the antenna or between the positive electrode of the power source and the metal band portion. Furthermore, since the antenna part and the metal band part have different structures, and the antenna is inserted inside the metal band, the width of the antenna plate required to obtain the known antenna efficiency is secured, and then the metal part We also ensure the freedom of band design.

[0007]

With the above structure of the present invention, the sensitivity is obtained by the combination of the connecting method of the loop antenna formed of two conductive thin plates through the conductive clasp and the conductor formed on the surface of the synthetic resin. FIG. 8 shows an example of the relationship of The same radio was used for the experiments, and bands of the same length were used. In the figure, 19 is the sensitivity of a radio device using a band antenna in which an antenna plate according to the related art is inside a synthetic resin.

Reference numeral 20 denotes the sensitivity of a radio device using a band antenna in which the antenna part and the metal band part are electrically connected to each other and the metal band part and the positive electrode of the power source are insulated. 21 is the sensitivity of the radio using a band antenna in which the metal band part is insulated from both the antenna and the positive electrode of the power supply.

Reference numeral 22 indicates the sensitivity of a radio device using a band antenna that insulates between the antenna and the metal band portion and conducts between the metal band portion and the positive electrode of the power supply. Reference numeral 23 is the sensitivity of the radio device using the antenna band in which the antenna and the positive electrode of the power source are conducted through the metal band part. The above sensitivities are shown by frequency characteristic examples. The sensitivity 20 of the wireless device using the band antenna in which the metal band part is insulated from the positive electrode of the power source and the sensitivity 21 of the wireless device using the band antenna in which the metal band part is insulated from both the antenna and the positive electrode of the power source are the loop antenna. Since the insulating portion is provided so that the magnetic fluxes can cross each other, there is no difference in terms of the sensitivity 19 and the antenna efficiency of the radio device using the band antenna of the prior art having no metal band portion.
Therefore, the sensitivities of the 19, 20, and 21 radios have the same value. Similarly, the sensitivities 22 and 19 of the radio equipment using the band antenna in which the antenna and the metal band part are insulated are considered to have the same antenna efficiency, but in the experiment, 22 is 1
A sensitivity of 1.5 dB better than 9 was obtained. The sensitivity 23 of the wireless device using the antenna band in which the antenna and the positive electrode of the power supply are conducted through the metal band portion prevents the magnetic flux from crossing the loop antenna and lowers the antenna efficiency, so that it is about 19 or less. It became a poor sensitivity of 10 dB.

[0010]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a wristwatch type radio according to an embodiment of the present invention. Reference numeral 1 is an exterior case made of a conductive metal material, and a back cover 8 made of a conductive metal material is provided on the back side. It is constructed so that it can be attached to and detached from the exterior case 1 by fixing with screws. Reference numeral 10 is a wireless circuit mounted inside the exterior case 1, and 11 is a leaf spring contact point that elastically contacts the connector portion 5 of the antenna terminal. Reference numeral 9 is a leaf spring contact that elastically contacts the positive electrode of the power source and the back cover 8. The insulating layer 2 is made of an insulative synthetic rubber such as polyurethane rubber or silicone rubber, and the antenna plate 3 is made of a conductor that is not easily oxidized inside.
Is insert-molded. At the end of the antenna plate 3,
The connection terminal 4 made of a stainless material is welded and is electrically connected to the connector-5. The outside of the insulating layer 2 is covered with the metal band portion 6. The metal band portion 6 is welded to the connection terminal 18 at the end portion thereof, and is fixed by screws with the exterior case 1.
Also, it is electrically connected to the back cover 8. A spacer 17 made of synthetic resin is inserted between the metal band portion 6 and the clasp 7.

FIG. 2 is a sectional view of a band antenna according to an embodiment of the present invention. A connection terminal 4 made of stainless steel is welded to an end of an antenna plate 3 made of a conductor such as stainless steel which is difficult to oxidize. A spacer 17 is inserted between the outer case 1 and the back cover 8, which is the end of the metal band 6 that covers the outside of the antenna plate 3. Metal band 6
Is electrically connected to the antenna plate 3 via the clasp 7.

FIG. 3 is a sectional view of a band antenna according to an embodiment of the present invention. The insulating layer 2 is made of insulating synthetic rubber such as polyurethane rubber or silicon rubber, and the antenna plate 3 made of stainless steel or the like is inserted inside. -It is molded. A connection terminal 4 made of stainless steel is welded to an end of the antenna plate 3. A spacer 17 is inserted into an end portion of the metal band portion 6 that covers the outer side of the insulating layer 2 to insulate the exterior case 1 and the clasp 7. In the present embodiment, the material of the band portion is a conductor, but it is also possible to use by vapor deposition plating the non-conductor band portion.

FIG. 4 is a sectional view of a band antenna according to an embodiment of the present invention. The insulating layer 2 is made of insulating synthetic rubber, and an antenna plate 3 made of a conductor is insert-molded inside. A connection terminal 4 made of stainless material is welded to an end of the antenna plate 3. The non-conductive band portion 12 is attached to the front side of the insulating layer 2, and the metal band portion 6 is attached to the human body contact surface. The metal band portion 6 is welded to the connection terminal 18 at the end portion thereof and is electrically connected to the outer case 1 and the back cover 8 by fixing with screws. Metal band 6 and Nakadome 7
A spacer 17 is inserted between the and.

FIG. 5A is a sectional view of a band antenna according to an embodiment of the present invention, in which an insulating layer 2 is made of synthetic rubber and an antenna plate 3 made of a conductor is insert-molded inside. A connection terminal 4 made of stainless steel is welded to an end of the antenna plate 3. As shown in the perspective view of the band antenna in FIG. 5B, the metal band portion formed on the outer side of the insulating layer is formed by passing a plate part 13 made of a conductor which is difficult to oxidize through the insulating layer. . In FIG. 5 (a), the clasp 7 and the plate part 13 are insulated from each other by a spacer 17, and the outer case 1 and the plate part 13 are electrically connected by screw fixing. FIG. 5 (c) is an enlarged view of the end portion of the 6 o'clock side band according to the embodiment of the present invention.
Is a sectional view. The insulating layer 2 has an exposed portion of a claw provided on the antenna plate 3, and the plate part 13 and the spacer-1 are provided.
After passing through components such as No. 7, Nakadome 7 and the like, the claws of the antenna plate 3 are raised to mount plate parts having recesses. The metal band portion is fixed by engaging the convex portion of the antenna plate with the concave portion of the plate part.

FIG. 6A is a sectional view of a band antenna according to an embodiment of the present invention, in which an insulating layer 2 is made of synthetic rubber, and an antenna plate 3 made of a conductor is insert-molded inside. A connection terminal 4 made of stainless steel is welded to an end of the antenna plate 3. As shown in the perspective view of the band antenna of FIG. 6B, the metal band portion formed on the outer side of the insulating layer has a trapezoidal conductive metal plate 1 on the insulating layer 2.
4 is wound in a spiral shape to form a metal band portion. In FIG. 6A, a spacer 17 made of synthetic resin is inserted between the end of the metal plate 14 and the clasp 7.
Further, the outer case 1 and the metal plate 14 are electrically connected by screwing and fixing.

FIG. 7A is a sectional view of a band antenna according to an embodiment of the present invention, in which an insulating layer 2 is made of synthetic rubber, and an antenna plate 3 made of a conductor is insert-molded inside. A connection terminal 4 made of stainless steel is welded to an end of the antenna plate 3. As shown in the perspective view of the band antenna of FIG. 7B, the metal band portion formed on the outer side of the insulating layer is a conductive metal that is processed to have the thickness of the upper plate 15 made of a conductor and the insulating layer 2. Insulation layer 2 on lower plate 16
It is formed by sandwiching and spot welding. Figure 7
In (a), a spacer 17 is inserted between the clasp 7 and the conductive plate parts 15 and 16. The outer case 1 and the lower plate 16 are electrically connected by screwing and fixing.

[0018]

As described above, according to the present invention, it is possible to reduce the antenna efficiency of a loop antenna composed of a pair of antenna plates with a metal band having an antenna plate built in via the conductive clasp. Can be configured without. Therefore,
(EN) Provided as a high-end metal band which is easy to handle by pressing and has excellent fitting property as an antenna band for a wristwatch type wireless device.

[Brief description of drawings]

FIG. 1 is a sectional view of a band antenna according to an embodiment of the present invention.

FIG. 2 is a sectional view of a band antenna according to an embodiment of the present invention.

FIG. 3 is a sectional view of a band antenna according to an embodiment of the present invention.

FIG. 4 is a sectional view of a band antenna according to an embodiment of the present invention.

FIG. 5A is a sectional view of a band antenna according to an embodiment of the present invention. FIG. 3B is a perspective view of the band antenna according to the embodiment of the present invention. FIG. 3C is an enlarged view of the band antenna according to the embodiment of the present invention. FIG. 3D is a sectional view of the band antenna according to the embodiment of the present invention.

FIG. 6A is a sectional view of a band antenna according to an embodiment of the present invention. FIG. 3B is a perspective view of the band antenna according to the embodiment of the present invention.

FIG. 7A is a sectional view of a band antenna according to an embodiment of the present invention. FIG. 3B is a perspective view of the band antenna according to the embodiment of the present invention.

FIG. 8 is a sensitivity characteristic diagram according to an example using the present invention.

[Explanation of symbols]

1 Exterior Case 2 Insulation Layer 3 Antenna Plate 4 Connection Terminal 5 Connector-6 Metal Band 7 Nakadome 8 Back Lid 9 Circuit Leaf Spring Contact 10 Radio Circuit 11 Antenna Leaf Spring Contact 12 Non-conductor Band 13 Plate Part 14 Metal Plate 15 Upper Plate 16 Lower Plate 17 Spacer 18 Connection Terminal for Power Supply Positive Electrode 19 Sensitivity of Radio Equipment Using Antenna Band without Metal Band 20 Exterior Case and Metal Band Sensitivity of a radio using an antenna band with an insulated part 21 Sensitivity of a radio using an antenna band with a metal band insulated from a circuit 22 Sensitivity of a radio using an antenna band with an antenna and a metal band insulated 23 Sensitivity of radio equipment using an antenna band in which the antenna and the outer case are conducted

Claims (9)

[Claims] 1. A wristwatch-type wireless device band having a conductor, wherein a band portion made of a conductor is formed on the outside of the antenna plate in a wristwatch-type wireless device band having a conductor antenna plate in the band. 2. An insulating layer made of synthetic resin or the like is formed on the surface of the antenna plate so as to insulate the band portion formed outside, and an exposed portion of the antenna is provided at one end of the insulating layer to provide a conductive medium. The wristwatch-type wireless device band with an antenna according to claim 1, wherein the band is in electrical connection with the stay. 3. The conductive band portion has a joint portion at one end which is electrically connected to the conductive clasp side, and a conductive outer casing case at the other end.
The insulating portion is provided on the side of the window.
Alternatively, the wristwatch-type radio band with an antenna according to 2. 4. The conductive band portion has a joint portion at one end thereof which is electrically connected to the conductive outer case, and an insulating portion is provided at the other end of the clasp side. Item 2. A wristwatch-type radio band with an antenna according to item 2. 5. The wristwatch-type wireless device band with an antenna according to claim 2, wherein the conductive band portion is provided with an insulating portion between the outer case and the clasp at both ends. . 6. The wristwatch with an antenna according to claim 4, wherein the conductive band portion is formed of a plurality of hollow plate parts made of a conductor that is not easily oxidized, such as stainless steel and titanium. Type radio band. 7. The conductive band portion is formed by spirally winding a trapezoidal plate made of a conductor that is not easily oxidized, such as stainless steel or titanium, around the antenna plate in a spiral shape. Band for wristwatch type radio with antenna. 8. The conductive band portion is formed by spot welding by sandwiching the antenna plate from above and below with plate parts made of a conductor such as stainless steel or titanium which is not easily oxidized. Alternatively, the wristwatch-type wireless device band with an antenna according to 5. 9. A band attached to the 6 o'clock side as seen from the dial plate has a mooring portion composed of a concave portion provided on the endmost plate part and a convex portion provided on the antenna plate. 9. The wristwatch-type radio device band with an antenna according to claim 6, wherein the positions of the plate part and the clasp can be changed by removing the band part.