Radio

Abstract

To provide a radio device capable of preventing reduction in antenna gain due to miniaturization of a circuit board.SOLUTION: A radio device includes: a circuit board 20 having a notch (first notch 203); a radio communication circuit mounted on the circuit board; and a convex and concave portion 113 that serves as a battery housing portion disposed in the notch and houses a battery connected to the circuit board. The radio device includes: a linear antenna 213 that is connected to one end of the circuit board and wired so as not to surround the notch; and a conductor 214 that is connected to the ground of the circuit board and wired so as not to surround the battery.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a radio. [Background technology]

[0002] Wireless fire detectors have been known in the art. For example, Patent Document 1 describes a fire detector in which an antenna can be disposed inside a detector cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-248546 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the circuit board is made smaller in order to realize a smaller fire detector, the length of the ground of the wireless communication circuit becomes shorter, which causes a problem of reduced antenna gain.

[0005] The present invention has been made in view of the above circumstances, and has an object to suppress the decrease in antenna gain that accompanies the miniaturization of circuit boards. [Means for solving the problem]

[0006] In order to solve the above problems, a radio device according to the present invention includes a circuit board having a cutout portion, a wireless communication circuit mounted on the circuit board, a battery accommodating portion disposed in the cutout portion for accommodating a battery connected to the circuit board, a linear antenna connected to one end of the circuit board and wired so as not to surround the cutout portion, and a conductor connected to the ground of the circuit board and wired so as not to surround the battery.

[0007] The radio may further include a fire detection unit mounted on the circuit board, and a speaker disposed in the cutout portion and connected to the circuit board, wherein the antenna is wired to surround the fire detection unit, and the conductor is wired to surround the speaker.

[0008] The conductor may be connected to the other end of the circuit board. Effect of the Invention

[0009] According to the present invention, it is possible to suppress the decrease in antenna gain that accompanies the miniaturization of the circuit board. [Brief description of the drawings]

[0010] [Figure 1] Bottom view of smoke detector 1 [Diagram 2] Side view of smoke detector 1 [Diagram 3] Plan view of smoke detector 1 [Figure 4] FIG. 1 is an exploded perspective view of a smoke detector 1 with a cover 12 removed. [Diagram 5] Bottom view of the main body base plate 11 [Figure 6] FIG. 4 is an enlarged view of the push-in portions 117A and 117B shown in FIG. [Figure 7] Enlarged view of groove 1181 [Figure 8] A plan view of the circuit board 20 [Figure 9] A bottom perspective view of the circuit board 20 [Figure 10] Bottom view of antenna positioning plate 40 [Figure 11] Bottom view of smoke detector 1 with cover 12 removed [Figure 12] 1 is a plan view of a circuit board 20 according to a modified example. [Figure 13] 1 is a plan view of a circuit board 20 according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 1. Embodiment A wireless smoke detector 1 according to one embodiment of the present invention will be described with reference to the drawings. 1-1.Configuration Fig. 1 is a bottom view of the smoke detector 1. Fig. 2 is a side view of the smoke detector 1. Fig. 3 is a plan view of the smoke detector 1. Fig. 4 is an exploded perspective view of the smoke detector 1 with the cover 12 removed.

[0012] The smoke detector 1 comprises a housing 10, and a circuit board 20, a speaker 30 and an antenna positioning plate 40 housed in the housing 10.

[0013] The housing 10 has a substantially circular plate shape and is made of resin. The housing 10 includes a main body base plate 11 and a cover 12.

[0014] FIG. 5 is a bottom view of the main body base plate 11. FIG. The main body base plate 11 is circular and includes a bottom surface 111, an upper surface 112, an uneven portion 113, a first wall portion 114, a second wall portion 115, a third wall portion 116, pressing portions 117A and 117B, antenna positioning portions 118A to 118C, and a pressing portion positioning portion 119.

[0015] The bottom surface 111 faces the circuit board 20 .

[0016] The upper surface 112 is the surface facing the ceiling on which the smoke detector 1 is installed.

[0017] The uneven portion 113 is a battery housing portion that houses a cylindrical battery. The housed battery is connected to the circuit board 20 and supplies power to each circuit. The uneven portion 113 is convex on the bottom surface 111 side of the main body base plate 11 and concave on the top surface 112 side. The battery is housed in the recess on the top surface 112 side. The uneven portion 113 extends radially from the center of the main body base plate 11 to its periphery when viewed from the bottom.

[0018] The uneven portion 113 includes a semi-cylindrical portion 1131 and bottom portions 1132 and 1133. The bottom portions 1132 and 1133 are semicircular plate bodies. The bottom portions 1132 and 1133 are provided at both ends of the semi-cylindrical portion 1131. The bottom portion 1132 is provided radially inward of the main body base plate 11 in a bottom view compared to the bottom portion 1133.

[0019] The first wall portion 114 forms a smoke detection space. The first wall portion 114 protrudes in a substantially vertical direction from the bottom surface 111 of the main body base plate 11. The first wall portion 114 has an isosceles trapezoidal shape with a lower base longer than an upper base when viewed from the bottom. The first wall portion 114 is formed on the axis of the battery accommodated in the uneven portion 113 when viewed from the bottom.

[0020] The first wall portion 114 includes walls 1141, 1142, 1143, and 1144. The walls 1141 and 1142 are formed so as to intersect approximately perpendicularly with the axis of the battery housed in the uneven portion 113 in a bottom view. The wall portion 1141 is shorter than the wall portion 1142, and is formed radially inward of the main body base plate 11. The wall portion 1143 includes a through hole 1145 (not shown). The through hole 1145 passes light emitted from the light-emitting portion 208 (described later) into the smoke detection space. The wall portion 1144 includes a through hole 1146 (see FIG. 4). The through hole 1146 passes light received from the smoke detection space by the light-receiving portion 209 (described later).

[0021] Next, the second wall portion 115 determines the position of the speaker 30 described later. The second wall portion 115 protrudes in a substantially vertical direction from the bottom surface 111 of the main body base plate 11. The second wall portion 115 has a substantially C-shape in a bottom view. The second wall portion 115 is formed so as to be adjacent to the uneven portion 113 in a bottom view. Ends 1151 and 1152 of the second wall portion 115 are disposed on substantially the same line as the bottom portion 1132 of the uneven portion 113 in a bottom view. Of the ends 1151 and 1152, the end portion 1151 is disposed radially outward of the main body base plate 11.

[0022] The third wall portion 116 determines the position of the circuit board 20. The third wall portion 116 protrudes in a substantially vertical direction from the bottom surface 111 of the main body base plate 11. The third wall portion 116 is formed so as to surround a substantially L-shaped region when viewed from the bottom.

[0023] The third wall portion 116 includes walls 1161, 1162, and 1163. In a bottom view, the wall portion 1161 has one end connected to the end portion 1151 of the second wall portion 115, extends along the periphery of the main body base plate 11, and the other end connected to the wall portion 1143 of the first wall portion 114. In a bottom view, the wall portion 1162 has one end connected to the wall portion 1144 of the first wall portion 114, extends along the periphery of the main body base plate 11, and the other end connected to the bottom portion 1133 of the uneven portion 113. In a bottom view, the wall portion 1163 has one end connected to the other end of the wall portion 1162, extends along the semi-cylindrical portion 1131 and the bottom portion 1132 of the uneven portion 113, and the other end connected to the second wall portion 115.

[0024] Next, the pushing parts 117A and 117B are rod-shaped members. The pushing parts 117A and 117B are formed so as to be pushed into the bottom surface 111 side of the main body base plate 11. The pushing parts 117A and 117B are formed by forming a U-shaped through groove in the main body base plate 11 in a bottom view. The pushing parts 117A and 117B are formed so as to be adjacent to the uneven part 113 in a bottom view. The pushing parts 117A and 117B are formed on the opposite side of the second wall part 115 across the uneven part 113 in a bottom view. The pushing parts 117A and 117B are formed so as to be aligned parallel to the axis of the battery accommodated in the uneven part 113 in a bottom view.

[0025] FIG. 6 is an enlarged view of the push-in portions 117A and 117B shown in FIG. Push-in portion 117A includes a rod-shaped member 1171A and a protrusion 1172A. Protrusion 1172A protrudes from an end of rod-shaped member 1171A toward upper surface 112 of main body base plate 11. Rod-shaped member 1171A of push-in portion 117A is disposed so as to contact registration switch 211, which will be described later, and when push-in portion 117A is pushed in by a user, registration switch 211 is pressed.

[0026] The pressing portion 117B includes a rod-shaped member 1171B and a protruding portion 1172B. The protruding portion 1172B protrudes from an end of the rod-shaped member 1171B toward the upper surface 112 of the main body base plate 11. The rod-shaped member 1171B of the pressing portion 117B is disposed so as to contact an erase switch 212, which will be described later, and when the pressing portion 117B is pressed by a user, the erase switch 212 is pressed.

[0027] Of convex portion 1172A of push-in portion 117A and convex portion 1172B of push-in portion 117B, convex portion 1172A protrudes toward upper surface 112 of main body base plate 11. Therefore, convex portion 1172A is easier to press and convex portion 1172B is harder to press. This is to prevent erroneous operation of erase switch 212.

[0028] Next, antenna positioning units 118A to 118C position antenna 213, which will be described later. Antenna positioning units 118A to 118C are rectangular plates, and protrude from the periphery of bottom surface 111 of main body base plate 11 in a substantially vertical direction.

[0029] Among the antenna positioning parts 118A to 118C, the antenna positioning parts 118A and 118B are inserted into the through holes 416A and 416B (see FIG. 10) formed in the antenna positioning plate 40 to position the antenna 213 on the bottom surface 401 side of the antenna positioning plate 40, and guide smoke to the ventilation hole 407 (see FIG. 10) described later. As shown in FIG. 4, the antenna positioning parts 118A and 118B have a U-shaped groove part 1181 at the tip. FIG. 7 is an enlarged view of the groove part 1181. The antenna positioning parts 118A and 118B have a pair of opposing protrusions 1182 in the groove part 1181. The protrusions 1182 hold the antenna 213 in between in the groove part 1181. In other words, the protrusions 1182 press the antenna 213 inward and outward. As a result, the antenna 213 is prevented from swinging.

[0030] Of antenna positioning portions 118A and 118B, antenna positioning portion 118A is formed on the axis of the battery housed in concave-convex portion 113 in bottom view. Antenna positioning portion 118A is formed radially outward of main body base plate 11 from first wall portion 114. Antenna positioning portion 118B is formed in contact with wall portion 1161 constituting third wall portion 116 in bottom view.

[0031] 4, antenna positioning portion 118C has a U-shaped groove 1183 and a U-shaped groove 1184 at its tip. Groove 1183 positions antenna 213. Groove 1184 positions push-in portion 1221 (see FIG. 1) in a through hole formed in bottom portion 122 of cover 12, as described below. Groove 1183 is formed radially outward of main body base plate 11 with respect to groove 1184.

[0032] Antenna positioning portion 118C is formed to be aligned substantially on the same line as bottom portion 1132 of concave-convex portion 113 in bottom view. Antenna positioning portion 118C is formed adjacent to wall portion 1162 that constitutes third wall portion 116 in bottom view.

[0033] Next, the pushing-in portion positioning portion 119 positions the pushing-in portion 1221 (see FIG. 1) in a through-hole formed in the bottom portion 122 of the cover 12. As shown in FIG. 4, the pushing-in portion positioning portion 119 has a U-shaped groove portion 1191 at its tip. The groove portion 1191 positions the shaft portion of the pushing-in portion 1221.

[0034] The pushing-in portion positioning portion 119 is formed to be aligned substantially on the same line as the bottom portion 1132 of the uneven portion 113 in a bottom view. The pushing-in portion positioning portion 119 is formed adjacent to the wall portion 1162 that constitutes the third wall portion 116 in a bottom view.

[0035] 1 and 2, the cover 12 has a cylindrical shape with a bottom. The open end of the cover 12 is fixed to the periphery of the bottom surface 111 side of the main body base plate 11. The cover 12 has a cylindrical portion 121 and a bottom portion 122.

[0036] The cylindrical portion 121 has eight ventilation holes 1211. The ventilation holes 1211 are formed on the bottom 122 side of the cylindrical portion 121. The ventilation holes 1211 are formed in a line of four in the circumferential direction of the cylindrical portion 121 and two in the axial direction. Each ventilation hole 1211 extends in an elongated manner in the circumferential direction of the cylindrical portion 121. Each ventilation hole 1211 allows smoke to flow into a space formed between the cover 12 and the antenna positioning plate 40.

[0037] The bottom 122 includes a pressing portion 1221. The pressing portion 1221 is a plate having an oval shape in a bottom view, and has an axis portion (not shown) on one end side (the radially outer side of the cover 12). The pressing portion 1221 is attached so as to be capable of being pressed into a through hole formed in the bottom 122. The pressing portion 1221 is disposed so as to be capable of pressing an inspection switch 210, which will be described later, and when the pressing portion 1221 is pressed by a user, the inspection switch 210 is pressed.

[0038] A pair of cover side positioning parts (not shown) having U-shaped groove parts (not shown) at their tips are provided on the upper surface side (inner surface side) of the bottom part 122. The shaft part of the pressing part 1221 is sandwiched between the pair of cover side positioning parts, the groove part 1184 of the antenna positioning part 118C of the main body base plate 11, and the groove part 1191 of the pressing part positioning part 119, so that the pressing part 1221 is positioned within the through hole of the cover 12.

[0039] Next, the circuit board 20 will be described. Fig. 8 is a plan view of the circuit board 20. Fig. 9 is a bottom perspective view of the circuit board 20. The circuit board 20 is disposed below the main body base plate 11. The circuit board 20 is formed by cutting out a portion of a substantially circular board into a sector shape. The circuit board 20 has a substantially L-shape. The circuit board 20 includes a bottom surface 201, a top surface 202, a first cutout portion 203, a base portion 204, a first extension portion 205, a second extension portion 206, a second cutout portion 207, a light emitting portion 208, a light receiving portion 209, an inspection switch 210, a registration switch 211, an erase switch 212, an antenna 213, a conductor 214, a control circuit 215 (not shown), and a wireless communication circuit 216 (not shown).

[0040] The bottom surface 201 is the surface facing the antenna positioning plate 40 .

[0041] The upper surface 202 is the surface facing the main body base plate 11 .

[0042] The first cutout portion 203 is a sector-shaped cutout having a central angle of approximately a right angle. The first cutout portion 203 is an area in which the concave-convex portion 113 of the main body base plate 11 and the speaker 30 are disposed.

[0043] The base portion 204 is a generally rectangular portion.

[0044] The first extension portion 205 is a portion extending from one end of the base portion 204. The first extension portion 205 has an inner edge portion 2051 and an outer edge portion 2052. The inner edge portion 2051 is a straight edge portion facing the first cutout portion 203. The outer edge portion 2052 is an edge portion other than the inner edge portion 2051. The outer edge portion 2052 is an arc-shaped edge portion including a straight portion in part.

[0045] The second extension portion 206 is a portion extending from the other end of the base portion 204. The second extension portion 206 forms a substantially right angle with the first extension portion 205, sandwiching the first cutout portion 203 therebetween. The second extension portion 206 has an inner edge portion 2061 and an outer edge portion 2062. The inner edge portion 2061 is a substantially straight edge portion facing the first cutout portion 203. The outer edge portion 2062 is an edge portion other than the inner edge portion 2061. The outer edge portion 2062 is an arc-shaped edge portion including a linear portion in part.

[0046] The speaker 30 is connected to the tip side of the inner edge portion 2061 of the second extension portion 206. The speaker 30 has a disk shape.

[0047] The base portion 204, the first extension portion 205 and the second extension portion 206 are integrally provided.

[0048] The second cutout portion 207 is a cutout having an isosceles trapezoidal shape with a lower base longer than an upper base. The second cutout portion 207 is formed on the rear end side of the outer edge portion 2062 of the second extension portion 206. The second cutout portion 207 is an area where the first wall portion 114 of the main body base plate 11 is disposed.

[0049] Specifically, the light emitting unit 208 is, for example, a light emitting diode. The light emitting unit 208 emits light into the smoke detection space formed by the first wall portion 114 of the main body base plate 11. At that time, the light emitting unit 208 emits light into the smoke detection space through the through hole 1145 of the first wall portion 114. The light emitting unit 208 is disposed on the upper surface 202 of the circuit board 20.

[0050] Specifically, the light receiving unit 209 is, for example, a photodiode. The light receiving unit 209 receives light emitted by the light emitting unit 208 and scattered by smoke in the smoke detection space. At that time, the light receiving unit 209 receives the scattered light through the through hole 1146 of the first wall portion 114. The light receiving unit 209 is disposed on the upper surface 202 of the circuit board 20.

[0051] The light emitting section 208 and the light receiving section 209 are disposed so as to face each other along the second cutout section 207. However, they are disposed so that their optical axes are not aligned on the same straight line. The light emitting unit 208 and the light receiving unit 209 constitute a fire detection unit.

[0052] When the inspection switch 210 is pressed, a test of the internal circuit (fire detection unit, etc.) and a test of the battery life are performed, and the results are notified by an LED (not shown). The inspection switch 210 is provided on the bottom surface 201 of the circuit board 20. The inspection switch 210 is provided on the rear end side of the first extension portion 205.

[0053] The registration switch 211 is a switch used to set a wireless channel to be used by the smoke detector 1. The registration switch 211 is provided on the upper surface 202 of the circuit board 20. The registration switch 211 is provided near the tip of the first extension portion 205.

[0054] The erase switch 212 is a switch used to erase the setting of a wireless channel in the smoke detector 1. The erase switch 212 is disposed on the upper surface 202 of the circuit board 20. The erase switch 212 is disposed near the tip of the first extension portion 205.

[0055] The antenna 213 is a metal wire. One end of the antenna 213 is connected to the wireless communication circuit 216, and extends along the inner wall of the cover 12 from the outer edge 2052 of the first extension portion 205 to the outer edge 2062 of the second extension portion 206 in a bottom view.

[0056] The antenna 213 includes a straight portion 2131 and an arc portion 2132. One end of the straight portion 2131 is connected to the wireless communication circuit 216, extends substantially vertically from the bottom surface 201 of the circuit board 20, and is inserted into an antenna hole 417 (see FIG. 10) formed in the antenna positioning plate 40. One end of the arc portion 2132 is connected to the other end of the straight portion 2131, and extends from an outer edge portion 2052 of the first extension portion 205 to an outer edge portion 2062 of the second extension portion 206 along the inner wall of the cover 12 in a bottom view.

[0057] Antenna 213 is connected to one end of circuit board 20, which has a substantially L-shape when viewed from the bottom, and extends so as to surround second cutout 207 (in other words, the fire detection portion) while not surrounding first cutout 203.

[0058] The conductor 214 is a metal wire. One end of the conductor 214 is connected to a ground (not shown) on the circuit board 20, and extends from an inner edge 2061 of the second extension portion 206 through the first cutout portion 203 along the inner wall of the cover 12 to an outer edge 2062 of the second extension portion 206 in a bottom view.

[0059] The conductor 214 includes a straight portion 2141 and an arc portion 2142. One end of the straight portion 2141 is connected to the ground on the circuit board 20, and extends from the inner edge portion 2061 of the second extension portion 206 to pass through the first cutout portion 203 in a bottom view. One end of the arc portion 2142 is connected to the other end of the straight portion 2141, and extends along the inner wall of the cover 12 to the outer edge portion 2062 of the second extension portion 206 in a bottom view.

[0060] Conductor 214 is connected to the other end of circuit board 20 which has a substantially L-shape in bottom view, and extends to surround speaker 30 while not surrounding uneven portion 113 of main body base plate 11 (in other words, the battery).

[0061] By increasing the length of the ground by using this conductor 214, the gain of the antenna 213 is improved compared to a case in which this conductor 214 is not provided. Moreover, the conductor 214 is wired so as not to surround the battery when viewed from the bottom, which further improves the gain of the antenna 213. In addition, the external dimensions of the device can be made smaller. Furthermore, by placing the battery further outwards, the effective size of the internal boards, etc. can be increased.

[0062] The control circuit 215 includes a CPU, a ROM, a RAM, etc. The CPU executes a control program stored in the ROM to execute a fire detection process, a fire signal transfer process, and a wireless channel setting process, which will be described later.

[0063] The wireless communication circuit 216 transmits and receives wireless signals to and from other smoke detectors 1 and relay devices via the antenna 213.

[0064] Next, the antenna positioning plate 40 will be described. FIG. 10 is a bottom view of the antenna positioning plate 40. As shown in FIG. The antenna positioning plate 40 is disposed below the circuit board 20. The antenna positioning plate 40 is formed by cutting out a portion of a substantially circular plate. The antenna positioning plate 40 has a substantially U-shape and is made of resin. The antenna positioning plate 40 includes a bottom surface 401, a top surface 402 (see FIG. 4), a cutout portion 403, a base portion 404, a first extension portion 405, a second extension portion 406, an air hole 407, a labyrinth wall 408, antenna positioning portions 409 to 415, through holes 416A and 416B, an antenna hole 417, a speaker hole 418, and a switch hole 419.

[0065] The bottom surface 401 faces the cover 12 .

[0066] The upper surface 402 is the surface facing the circuit board 20 .

[0067] The cutout portion 403 is a cutout having a substantially L-shape. The cutout portion 403 is a region where the concave-convex portion 113 of the main body base plate 11 is arranged.

[0068] The base portion 404 is a substantially semicircular portion. The base portion 404 has an arc-shaped peripheral edge portion 4041.

[0069] The first extension portion 405 and the second extension portion 406 are portions extended from the base portion 404. The first extension portion 405 and the second extension portion 406 extend substantially parallel to each other with the notch portion 403 therebetween.

[0070] The base portion 404, the first extension portion 405 and the second extension portion 406 are integrally provided.

[0071] The ventilation hole 407 is formed in approximately the center of the base 404. The ventilation hole 407 is elliptical. The ventilation hole 407 communicates with a smoke detection space formed by the first wall portion 114 of the main body base plate 11. The ventilation hole 407 allows smoke to flow into the smoke detection space.

[0072] The labyrinth wall 408 is formed around the vent hole 407. The labyrinth wall 408 protrudes in a substantially vertical direction from the bottom surface 401 of the antenna positioning plate 40. The labyrinth wall 408 is formed so as to allow smoke to flow into the vent hole 407 while preventing external light from entering the vent hole 407.

[0073] The ventilation hole 407 and the labyrinth wall 408 are covered by an optical bench cover 420 (see FIG. 11). The optical bench cover 420 has a cylindrical shape with a bottom. A plurality of holes (not shown) are formed in the side wall of the optical bench cover 420. The optical bench cover 420 allows smoke to flow into the ventilation hole 407 while blocking external light from entering the ventilation hole 407.

[0074] The antenna positioning portions 409 to 415 position the antenna 213 and guide smoke to the ventilation hole 407. The antenna positioning portions 409 to 415 are plates that protrude in a substantially vertical direction from the bottom surface 401 of the antenna positioning plate 40. The antenna positioning portions 409 to 415 are formed along the peripheral portion 4041 of the antenna positioning plate 40. The antenna positioning portions 409 to 415 are formed to extend radially around the labyrinth wall 408 with the ventilation hole 407 as the center when viewed from the bottom.

[0075] Each of the antenna positioning portions 409 to 415 has a notch 4091. The notch 4091 is an area for passing the antenna 213 through. The notch 4091 is a rectangular notch, and is formed on the peripheral edge portion 4041 side of the tip of the antenna positioning portions 409 to 415. The notch 4091 is formed so as to press the antenna 213 passing through the notch 4091 outward.

[0076] Next, through hole 416A is a hole for inserting antenna positioning portion 118A of main body base plate 11. Antenna positioning portion 118A inserted into through hole 416A positions antenna 213 on the bottom surface 401 side of antenna positioning plate 40.

[0077] The through hole 416B is a hole for inserting the antenna positioning portion 118B of the main body base plate 11. The antenna positioning portion 118B inserted into the through hole 416B positions the antenna 213 on the bottom surface 401 side of the antenna positioning plate 40.

[0078] The antenna positioning plate 40 is positioned relative to the main body base plate 11 by inserting the antenna positioning portions 118A and 118B into the through holes 416A and 416B.

[0079] The antenna hole 417 is a through hole for inserting the antenna 213. The antenna hole 417 is formed on the periphery of the second extension portion 406.

[0080] 11 is a bottom view of the smoke detector 1 with the cover 12 removed. This figure shows the antenna 213 wired along the bottom surface 401 of the antenna positioning plate 40. The antenna 213 is positioned by antenna positioning portions 118A to 118C of the main body base plate 11. Of the antenna positioning portions 118A to 118C, the antenna positioning portions 118A and 118B position the antenna 213 when inserted into the through holes 416A and 416B of the antenna positioning plate 40. The antenna 213 is also positioned by antenna positioning portions 409 to 415 of the antenna positioning plate 40.

[0081] Returning to the description of the antenna positioning plate 40 shown in FIG. The speaker hole 418 is formed in the center of the first extension portion 405. The speaker hole 418 is formed to face the speaker 30.

[0082] The switch hole 419 is a through hole for inserting the inspection switch 210. The switch hole 419 is formed in the rear end portion of the second extension portion 406.

[0083] 1-2.Operation The following describes the operation of the smoke detector 1. Specifically, the following describes the fire detection process, the fire signal transfer process, and the wireless channel setting process.

[0084] 1-2-1. Fire detection processing When smoke is generated by a fire and reaches the ceiling, the smoke flows into the smoke detector 1 through the vent hole 1211. The smoke that flows into the smoke detector 1 is guided by the antenna positioning parts 118A and 118B of the main body base plate 11 and the antenna positioning parts 409 to 415 of the antenna positioning plate 40, and flows into the optical base cover 420. The smoke that flows into the optical base cover 420 passes between the labyrinth walls 408 and passes through the vent hole 407 to flow into the smoke detection space. The smoke particles that flow into the smoke detection space collide with the light emitted by the light emitting part 208 and generate scattered light. When the scattered light is received by the light receiving part 209, the light receiving part 209 outputs a detection signal to the control circuit 215. When the detection signal is input, the control circuit 215 causes the speaker 30 to emit an alarm sound and causes the wireless communication circuit 216 to transmit a fire signal to other smoke detectors 1 and relay devices.

[0085] 1-2-2. Fire signal transmission processing When another smoke detector 1 detects a fire and the fire signal transmitted from this smoke detector 1 is received by the wireless communication circuit 216, the control circuit 215 causes the speaker 30 to emit an alarm sound, and also causes the wireless communication circuit 216 to retransmit the fire signal to another smoke detector 1 or a relay device. This allows the devices constituting the system to share the fire signal and issue a fire alarm in conjunction with each other.

[0086] 1-2-3. Wireless channel setting process When the user presses the pressing portion 117A of the main body base plate 11 and presses and holds the registration switch 211, the control circuit 215 transitions to a wireless channel setting mode. Thereafter, the control circuit 215 changes the wireless channel each time the registration switch 211 is pressed for a short time. Each time the wireless channel is changed, the control circuit 215 causes the speaker 30 to emit a guide voice notifying the user of the wireless channel number. Then, when the registration switch 211 is pressed and held again, the control circuit 215 stores the number of the selected wireless channel and ends the wireless channel setting mode. The wireless channel numbers thus stored are erased when the user presses the depression portion 117B of the main body base plate 11 and presses the erase switch 212 for a long period of time.

[0087] In the smoke sensor 1 described above, the length of the ground of the wireless communication circuit 216 is extended by the conductor 214, and as a result, the gain of the antenna 213 is improved compared to a case in which the conductor 214 is not provided. Moreover, the conductor 214 is wired so as not to surround the battery when viewed from the bottom, which further improves the gain of the antenna 213. In addition, the external shape of the device can be made smaller. Furthermore, by placing the battery further outward, the effective size of the internal boards, etc. can be increased. Furthermore, in this smoke detector 1, antenna 213 is positioned with antenna positioning portions 118A and 118B of main body base plate 11 inserted into through holes 416A and 416B of antenna positioning plate 40. Therefore, antenna positioning plate 40 is positioned relative to main body base plate 11, making it easy to assemble the smoke detector 1.

[0088] 2. Variations The above embodiment may be modified as follows: The modifications described below may be combined with each other.

[0089] 2-1. Variation 1 The shape of the main body base plate 11 and the arrangement of its components are not limited to the example shown in Fig. 5. These may be modified as appropriate within the scope of the invention described in the claims.

[0090] 2-2. Variation 2 The shape and number of antenna positioning portions 118A to 118C provided on main body base plate 11 are not limited to the example shown in Fig. 5. These may be changed as appropriate within the scope of the invention described in the claims.

[0091] For example, protrusions 1182 (see FIG. 7) provided in grooves 1181 of antenna positioning units 118A and 118B may be omitted in part or in whole of grooves 1181. When protrusions 1182 are omitted, antenna positioning units 118A and 118B press antenna 213 passed through grooves 1181 outward or inward to position it.

[0092] As another example, a pair of opposing protrusions may be provided in groove 1183 of antenna positioning portion 118C. The protrusions sandwich antenna 213 within the groove. In other words, the protrusions press antenna 213 inward and outward. As a result, antenna 213 is prevented from swinging.

[0093] 2-3. Variation 3 The shape of the circuit board 20 and the arrangement of its components are not limited to the example shown in Fig. 8. These may be modified as appropriate within the scope of the invention described in the claims.

[0094] For example, the circuit board 20 may include an antenna positioning portion. This antenna positioning portion is inserted into a through hole (not shown) formed in the antenna positioning plate 40 to position the antenna 213 on the bottom surface 401 side of the antenna positioning plate 40, and guides smoke to the ventilation hole 407 (see FIG. 10). This antenna positioning portion is a rectangular plate body, and protrudes in a substantially vertical direction from the periphery of the bottom surface 201 of the circuit board 20. This antenna positioning portion has a U-shaped groove at its tip, and has a pair of opposing protrusions in the groove. The protrusions hold the antenna 213 in the groove.

[0095] 2-4. Variation 4 The length of antenna 213 and its connection position to circuit board 20 are not limited to the example shown in Fig. 8. These may be changed as appropriate within the scope of the invention described in the claims.

[0096] 2-5. Variation 5 The length of the conductor 214 and its connection position to the circuit board 20 are not limited to the example shown in Fig. 8. These may be changed as appropriate within the scope of the invention described in the claims.

[0097] 12, the other end of the conductor 214 may be connected to the tip of the second extension portion 206. By connecting the other end of the conductor 214 to the second extension portion 206 in this manner, the position of the conductor 214 is fixed.

[0098] As another example, as shown in FIG. 13, one end of the conductor 214 may not be connected to the inner edge 2061 of the second extension portion 206, and only the other end may be connected to the tip of the second extension portion 206.

[0099] 2-6. Variation 6 The shape of the antenna positioning plate 40 and the arrangement of its components are not limited to the example shown in Fig. 10. These may be modified as appropriate within the scope of the invention described in the claims.

[0100] 2-7. Variation 7 The shape and number of antenna positioning units 409 to 415 are not limited to the example shown in Fig. 10. These may be changed as appropriate within the scope of the invention described in the claims.

[0101] For example, antenna positioning portions 409 to 415 may have a U-shaped groove instead of notch 4091, and a pair of opposing protrusions may be provided in this groove. The protrusions hold antenna 213 in the groove. In other words, the protrusions press antenna 213 inward and outward. As a result, antenna 213 is prevented from swinging.

[0102] 2-8. Variation 8 The invention described in the claims may be applied to wireless devices other than the smoke detector 1. For example, it may be applied to wireless heat detectors, wireless flashlights, and wireless repeaters. Here, a flashlight is an alarm device for notifying the hearing impaired of a fire. [Explanation of symbols]

[0103] Reference Signs List 1...smoke detector, 10...housing, 11...main body base plate, 12...cover, 20...circuit board, 30...speaker, 40...antenna positioning plate, 111...bottom surface, 112...upper surface, 113...uneven portion, 114...first wall portion, 115...second wall portion, 116...third wall portion, 117A, 117B...pressing portion, 118A to 118C...antenna positioning portion, 119...pressing portion positioning portion, 121...cylindrical portion, 122...bottom portion, 201...bottom surface, 202...upper surface, 203...first notch, 204...base, 205...first extension, 206...second extension, 207...second notch, 208...light emitting section, 209...light receiving section, 210...inspection switch, 211...registration switch, 212...deletion switch, 213...antenna, 214...conductor, 215...control circuit, 216...wireless communication circuit, 401...bottom surface, 402...upper surface, 403...notch, 404...base, 405...first extension, 406...second extension, 407...ventilation hole, 408...labyrinth wall, 409-415...antenna positioning portion, 416A, 416B...through hole, 417...antenna hole, 418...speaker hole, 419...switch hole, 420...optical base cover, 1131...semi-cylindrical portion, 1132, 1133...bottom, 1141, 1142, 1143, 1144...wall portion, 1145, 1146...through hole, 1151, 1152...end portion, 1161, 1162, 1163...wall portion, 1171A, 1171B... rod-shaped members, 1172A, 1172B... convex portion, 1181... groove portion, 1182... convex portion, 1183... groove portion, 1184... groove portion, 1191... groove portion, 1211... ventilation hole, 1221... push-in portion, 2051... inner edge portion, 2052... outer edge portion, 2061... inner edge portion, 2062... outer edge portion, 2131... straight portion, 2132... arc portion, 2141... straight portion, 2142... arc portion, 4041... peripheral portion, 4091... notch portion

Claims

[Claim 1] A circuit board; a wireless communication circuit mounted on the circuit board; an antenna connected to the circuit board; A main body base plate, The circuit board is disposed under the main body base plate, A registration switch used for setting a wireless channel and a deletion switch used for deleting the setting of the wireless channel are provided on the upper surface of the circuit board, The main body base plate is a first pressing portion that protrudes from an upper surface side of the main body base plate, is formed so as to be capable of being pressed into a bottom surface side of the main body base plate, and presses the registration switch when pressed by a user; a second pressing portion that protrudes from the upper surface side of the main body base plate, is formed so as to be capable of being pressed into the bottom surface side of the main body base plate, and presses down the erase switch when pressed by the user; The first pressing portion protrudes toward the upper surface side of the main body base plate more than the second pressing portion. A radio device characterized by:

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