JP2006094353A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device in which miniaturization of the entire device can be facilitated, short-time assembling is possible, and anti-vibration can be improved. <P>SOLUTION: In the antenna device 10, the base end of the frame 90 of a supporting mechanism 32 is fixed on the top surface of the base plate 50 of a first rotating mechanism 30, and the tip end of the frame 90 cantilevers and supports one end of a second rotating mechanism 34 connected to an antenna unit 36 in the upper part of the base plate 50. With this configuration, the space of the frame 90 is reduced as an antenna support which occupied in the entire device compared to an antenna device of a both end supporting structure in a conventional technique, the miniaturization of the entire device can be easily realized. Further, the device can be easily assembled and an effect can be obtained for further improving the anti-vibration. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device capable of controlling an azimuth angle, an elevation angle, and a polarization angle. More specifically, the present invention relates to an antenna device that is mounted on a ship or the like and is suitably applied to satellite communication or the like.

  2. Description of the Related Art Conventionally, regarding a satellite communication antenna device mounted on a ship or the like, a structure in which a structure and a frame as a support mechanism are connected to each other on a base plate and the frame supports an antenna unit has been proposed (Patent Document 1). reference). The antenna device disclosed in Patent Document 1 requires vibration resistance. For this reason, the front-end | tip part of the said frame is formed in substantially U shape, and the both ends of the said antenna part are supported by the two arms which comprise the said U-shaped frame.

  In this case, each of the arms is provided with a bearing portion that receives a protruding portion that protrudes from the back surface of the antenna portion, and the bearing portions are arranged on the inner side and the outer side that are arranged along the axial direction of the protruding portion. It is comprised from the bearing and the spacer which is arrange | positioned between each said bearing and adjusts the space | interval of each said bearing. In the antenna device, by changing the size of the spacer and adjusting the interval between the bearings, vibration generated by swinging a ship or the like, and vibration generated when the base plate and the frame are rotated are The bearing is used to suppress it.

Japanese Examined Patent Publication No. 6-66573

  As described above, the antenna device according to the related art employs a structure that supports both ends of the antenna unit with the two arms constituting the support mechanism, so that the space occupied by the two arms as a whole is large. It is difficult to reduce the size of the antenna device.

  Further, when the antenna device is downsized, if the bearings are to be made smaller, more precise processing is required to adjust the size of the spacer. As a result, there is a problem that the assembly time of the antenna device in the manufacturing process increases. Furthermore, depending on the dimensional accuracy of the downsized spacer, it is difficult to suppress vibration in the bearing portion, and skill is required for its assembly.

  The present invention has been made in order to solve the above-described problems, and can be easily reduced in size, can be easily assembled in a short time, and can further improve vibration resistance. The purpose is to provide.

  An antenna device according to the present invention includes a first rotation mechanism that adjusts an azimuth angle, and a support mechanism in which a base end portion is fixed to an upper surface of the first rotation mechanism and a distal end portion extends above the first rotation mechanism. A second rotating mechanism whose one end is cantilevered above the first rotating mechanism and adjusts an elevation angle and a polarization angle via the tip of the supporting mechanism, and is supported by the second rotating mechanism and And an antenna unit that is rotatable in a desired azimuth angle direction, an elevation angle direction, and a polarization angle direction by the first rotation mechanism and the second rotation mechanism.

  In this case, since a so-called cantilever support structure is employed in which one end of the second rotation mechanism connected to the antenna unit is supported by the tip of the support mechanism, the antenna device according to the related art of the both-end support structure Compared to the above, the space for the antenna support portion occupying the entire apparatus is reduced, the entire apparatus can be easily reduced in size, and it can be easily assembled in a short time, and the vibration resistance can be further improved. Is obtained.

  Here, the second rotation mechanism includes a first fixing means for fixing the second rotation mechanism to the support mechanism, and a pressure between the second rotation mechanism and the support mechanism by a pressure applied to the first fixing means. A first pressurizing unit that suppresses vibration; a second fixing unit that fixes the antenna unit to the second rotating mechanism; and a pressure between the second rotating mechanism and the antenna unit by applying pressure to the second fixing unit. It is preferable to have a second pressurizing unit that suppresses the vibration of the second pressurizing unit.

  The antenna section is interposed between the second rotating mechanism and the support mechanism only by the first pressurizing means pressurizing the first fixing means and the second pressurizing means pressurizing the second fixing means. Therefore, the antenna device can be assembled in a short time in the manufacturing process. Further, since precise machining such as adjusting the size of the spacer is not necessary, the problem that vibration cannot be suppressed by the dimensional accuracy of the spacer is solved, and an antenna device with higher vibration resistance is realized. be able to.

  According to the present invention, since the so-called cantilever support structure in which one end of the second rotation mechanism connected to the antenna unit is supported by the tip end portion of the support mechanism is employed, the antenna device according to the related art of the both-end support structure Compared to the above, the space for the antenna support portion occupying the entire apparatus is reduced, the entire apparatus can be easily reduced in size, and it can be easily assembled in a short time, and the vibration resistance can be further improved. Is obtained.

  Preferred embodiments of an antenna device according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  1 is a perspective view of an antenna device 10 according to the present embodiment as viewed from the front side, FIG. 2 is a perspective view of the antenna device 10 as viewed from the back side, and FIG. 3 is a perspective view of the antenna device 10. It is a perspective view which shows the radar dome 12 which accommodates. 4 is a front view of the antenna device 10 in a state where the pedestal 14 of the radar dome 12 is omitted, and FIG. 5 is a side view of the antenna device 10 shown in FIG. FIG. 7 is a bottom view of the antenna device 10, and FIG. 7 is a cross-sectional view taken along the line VII-VII in FIGS. 1 and 2.

  An antenna device 10 according to the present embodiment shown in FIGS. 1, 2, and 4 to 7 is an antenna device for satellite communication, and in order to ensure weather resistance, the dome-shaped radar dome 12 shown in FIG. Is housed inside. The radar dome 12 includes a disk-shaped pedestal 14 on which the antenna device 10 (see FIGS. 1 and 2) is placed, and a bell-shaped cover 16 that covers the antenna device 10 placed on the pedestal 14 from above. And a leg portion 18 connected to the bottom surface of the pedestal 14. The leg portion 18 is fastened and fixed to a mast of a ship (not shown) by a screw 20, and thus the radar dome 12 is fixed on the mast.

  In this case, the antenna device 10 is connected to various communication devices such as a telephone and a facsimile disposed in the ship via a cable 22 (see FIGS. 4 to 7). The signal transmitted via the radio 22 is transmitted as a radio wave to a geostationary satellite (not shown), or the radio wave received from the geostationary satellite is converted into a signal, and the converted signal is transmitted to each communication device via the cable 22. Output.

  A plurality of holes are formed in the edge portion of the base 14 in the direction of arrow A, and the cover 16 is fastened to the base 14 by screws 24 that pass through the holes. In this case, on the inner side of the edge portion, as shown in FIGS. 1 and 2, the protruding portion 26 is positioned upward (arrow A1) along the inner peripheral surface (not shown) of the cover 16 (see FIG. 3). Direction). Further, a groove is formed between the protruding portion 26 and each hole of the pedestal 14, and a packing 28 is disposed in the groove.

  Thus, when the antenna device 10 is placed on the upper surface of the pedestal 14 and the cover 16 (see FIG. 3) is lowered along the protruding portion 26 from above, the bottom of the cover 16 is the edge of the pedestal 14. The protrusion 26 and the packing 28 are contacted. When the base 14 and the cover 16 are fastened with screws 24 in this state, the antenna device 10 is accommodated in the radar dome 12.

  As shown in FIGS. 1, 2, and 4 to 7, the antenna device 10 described above includes the first rotation mechanism 30 disposed inside the protruding portion 26 on the upper surface of the base 14, and the first rotation mechanism 30. A support mechanism 32 having a base end portion disposed on the upper surface of the rotation mechanism 30, a second rotation mechanism 34 cantilevered at the distal end of the support mechanism 32, and the first rotation mechanism by the second rotation mechanism 34. The antenna unit 36 is supported basically above 30. 4-7, illustration of the base 14 is abbreviate | omitted as mentioned above.

  As shown in FIG. 7, the first rotation mechanism 30 includes a substantially annular horizontal rotation shaft portion (AZ shaft portion) 38 disposed on the upper surface of the base 14 (see FIG. 3), and the AZ shaft portion 38. A pulley 40 and a bearing 42 disposed on the side, a first bearing retainer plate 44 and a second bearing retainer plate 46 disposed on the upper surface of the bearing 42, and a holding plate 48 disposed on the bottom surface of the bearing 42 The base plate 50 is disposed so as to surround the outer peripheral surface of the bearing 42, and the motor (first motor) 56 is disposed on the upper surface of the base plate 50. A flat high frequency circuit unit (RFU) 54 is disposed on the bottom surface of the base plate 50 via an RFU substrate 52.

  The bottom 58 of the AZ shaft portion 38 is supported by the pedestal 14 (see FIGS. 1 and 2). As is understood from FIG. 7, the AZ shaft portion 38 has a substantially cylindrical projecting portion 60 bulging upward at a substantially central portion of the circular bottom portion 58, and a flange portion on the inner wall of the projecting portion 60. 62 is formed. A hole 66 is formed in the center of the flange portion 62. An annular stepped portion 64 is formed outside the upper end portion of the protruding portion 60, and the bearing 42 is fitted to the stepped portion 64. On the other hand, the pulley 40 is fitted to a portion where the protruding portion 60 rises, that is, the shoulder portion of the bottom portion 58, and is fixed by an appropriate fixing means, for example, a screw 70. The central axis of the hole 66 is a horizontal rotation axis (AZ axis) 68 orthogonal to the AZ axis portion 38.

  Here, a timing belt 78 is suspended from the outer portion 72 of the pulley 40 between a pulley 76 attached to a rotating shaft 74 (see FIGS. 5 and 6) of the first motor 56.

  As shown in FIG. 7, the upper surface of the bearing 42 and the upper surface of the projecting portion 60 have substantially the same height, and cover the upper surface of the projecting portion 60 and the portion near the AZ axis 68 on the upper surface of the bearing 42. In this manner, a substantially annular first bearing pressing plate 44 (see FIGS. 1, 2 and 7) is fixed. On the upper surface of the bearing 42, a substantially rectangular second bearing pressing plate 46 is placed at a predetermined distance so as to surround the first bearing pressing plate 44.

  Furthermore, the height of the upper surface of the base plate 50 is substantially the same as the upper surface of the bearing 42 and the upper surface of the protruding portion 60. The second bearing retainer plate 46 is placed so as to cover a portion near the base plate 50 on the upper surface of the bearing 42 and a portion near the bearing 42 on the upper surface of the base plate 50. It is integrated with the second bearing retainer plate 46.

  Furthermore, a holding plate 48 is disposed in the vicinity of the step portion 64 of the protruding portion 60, and the holding plate 48 is fixed to the base plate 50.

  Therefore, the bearing 42 in the first rotating mechanism 30 is regulated in the direction of arrow B by the AZ shaft portion 38 and the base plate 50, and in the direction of arrow A (by the first bearing pressing plate 44, the second bearing pressing plate 46 and the holding plate 48). AZ axis 68 direction). On the other hand, the base plate 50 is supported by the AZ shaft portion 38 via the first bearing retainer plate 44 and the second bearing retainer plate 46. As a result, the bearing 42 is accommodated in the bearing accommodating portion 51 configured by the AZ shaft portion 38, the first bearing retainer plate 44, the second bearing retainer plate 46, the holding plate 48, and the base plate 50.

  Here, the RFU 54 amplifies signals input from the communication devices in the ship via the cable 22 and transmits the amplified signals from the antenna unit 36 as radio waves to a stationary satellite (not shown). In addition to being a component, it is also a heating element that dissipates heat generated from a built-in power transistor (not shown).

  In this case, as shown in FIGS. 2 and 6, the RFU substrate 52 is disposed on the bottom surface of the base plate 50 so as to extend from the front side of the antenna device 10 to the back side, that is, in the direction of arrow C. . The RFU 54 substantially covers the entire bottom surface of the RFU substrate 52 and overlaps with a part of the frame 90 constituting the support mechanism 32 in a plan view. Further, the RFU 54 has a rotation range of the antenna unit 36 in a side view. It has a thickness so as not to interfere, and is disposed in a plane on the bottom surface of the RFU substrate 52 (see FIGS. 4 and 6). Furthermore, the aluminum base plate 50 functions as a shield portion for the antenna portion 36 of the RFU 54.

  Here, as shown in FIGS. 2 and 5, the front side of the antenna device 10 is the front end side of the support mechanism 32 that cantilever-supports the second rotation mechanism 34 (in the direction of arrow C <b> 1). The back side refers to a base end side (arrow C2 direction side) where the support mechanism 32 is fixed to the first rotating mechanism 30.

  Further, an angle sensor 96 for measuring the rotation angle of the base plate 50 relative to the pulley 40 when the base plate 50 rotates is disposed on the bottom surface of the base plate 50 (see FIG. 6).

  1, 2, and 4 to 7, the first motor 56 is located near the base end portion of the frame 90 constituting the support mechanism 32, which is in the direction of the arrow C <b> 2 in the upper surface of the base plate 50. Is disposed via a mounting plate 92 (see FIGS. 1, 2 and 7).

  A rotation shaft 74 (see FIGS. 5 and 6) of the first motor 56 passes through the base plate 50 and the holding plate 48 (see FIGS. 6 and 7) and extends from the first motor 56 in the direction of arrow A2. The pulley 76 is attached to the tip portion. A timing belt 78 is suspended between the pulley 76 and the pulley 40 as shown in FIG.

  Further, a weight 100 for adjusting the weight balance of the entire antenna device 10 is fastened and fixed to the base plate 50 at the edge of the base plate 50 in the direction of arrow C1, as shown in FIGS. ing.

  An antenna control unit (ACU) 104 serving as a control circuit for the antenna device 10 is disposed on the holding plate 48 (see FIGS. 1 and 2). In this case, the ACU 104 is arranged on the opposite side of the RFU 54 with respect to the AZ axis 68 (see FIGS. 4 and 7). Further, a GPS unit 106 is disposed on the upper surface of the ACU 104 as shown in FIGS. 2, 4, 5, and 7. The GPS unit 106 is electrically connected to the ACU 104 via a cable 108 and a connector 110. Connected.

  The ACU 104 is electrically connected to the RFU 54 via the cable 112 (see FIG. 1), while the RFU 54 is electrically connected to the second rotating mechanism 34 via the cable 114 and the cable 116. Is electrically connected to the antenna part 36 (see FIGS. 1 and 4).

  Note that a rotary joint 124 that electrically connects the connector 118 of the cable 22 and the connector 122 of the cable 120 extending from the ACU 104 is disposed in the hole 66 (see FIG. 7) of the AZ shaft portion 38.

  As shown in FIGS. 1, 2, and 5, the support mechanism 32 includes an aluminum frame 90, and a base end portion of the frame 90 is disposed in the direction of arrow C <b> 2 on the upper surface of the base plate 50. 56 (see FIG. 2 and FIG. 5), and the front end of the frame 90 cantilever-supports one end of the second rotation mechanism 34 shown in FIG. 2, FIG. 5, FIG. 8 and FIG. . As described above, the frame 90 is disposed so as to partially overlap the RFU 54 in plan view (see FIG. 6). Thereby, the heat generated by the RFU 54 and transmitted through the RFU substrate 52 and the base plate 50 can be radiated from the frame 90 to the outside.

  A second motor 134 (see FIG. 1) is fixed in the vicinity of the base end portion of the frame 90, and the rotating shaft 140 of the second motor 134 is connected to the frame 90 as shown in FIGS. The pulley 142 is attached to the front-end | tip part.

  As shown in FIGS. 2, 5, 8, and 9, the second rotation mechanism 34 includes a holding unit 150 whose one end is cantilevered by the tip of the frame 90, a third motor 152, and the holding unit. A mounting plate 154 provided on the top surface of 150 and the top surface of the third motor 152; and an angle sensor 158 supported by the holding portion 150 via a mounting plate 156 extending from the holding portion 150 in the direction of arrow A2. The angle sensor substrate 160 is supported by the holding portion 150 via the mounting plate 156.

  The holding unit 150 and the third motor 152 are fastened and fixed to the mounting plate 154, and a pulley 166 is attached to the rotating shaft 164 of the third motor 152.

  As shown in FIG. 9, the holding portion 150 is formed with a large-diameter concave portion 170 and a concave portion 174 having the same diameter on the opposite side of the concave portion 170, and the concave portion 170 and the concave portion 174 have a small diameter. The holes 172 communicate with each other. In this case, the central axis of the concave portion 170, the hole 172, and the concave portion 174 is an EL axis 176 along the arrow B direction.

  And the 1st fixing means 180 which fixes and supports the holding | maintenance part 150 to the flame | frame 90 is arrange | positioned through the recessed part 170, the hole 172, and the recessed part 174. As shown in FIG.

  Specifically, the first fixing means 180 includes a substantially cylindrical spacer 182 disposed in the hole 172 along the EL shaft 176, and a bearing 184 disposed in the recess 170 coaxially with the EL shaft 176. The bearing 186 disposed coaxially with the EL shaft 176 in the recess 174 and the hole 188 formed in the front end portion of the frame 90 pass through the bearing 184, the spacer 182 and the bearing 186. And a nut 192 that engages with the screw 190.

  Further, the first fixing means 180 is disposed between the bearing 186 and the frame 90 and has a substantially annular spacer 194 through which the screw 190 is inserted, and the frame 90 and the head of the screw 190. And a substantially annular spacer 196 through which the screw 190 is inserted.

  Furthermore, between the bearing 184 and the bottom surface 198 of the recess 170 in the arrow B1 direction, a substantially annular Belleville spring 200 as a first pressurizing means is interposed.

  Moreover, the holding part 150 in which the recessed part 174 is formed has a step part 202, and the pulley 204 is arranged so as to be fitted to the step part 202. The pulley 204 is fixed to the holding portion 150 by a screw 208 (see FIGS. 8 and 9). Further, a timing belt 206 is suspended between the pulley 204 and a pulley 142 attached to the rotating shaft 140 (see FIGS. 2 and 5) of the second motor 134 shown in FIG. (See FIGS. 5 and 8).

  In this case, an idler pulley 209 (see FIGS. 5, 8, and 9) is disposed in the frame 90 near the pulley 204 in parallel with the pulley 142. The idler pulley 209 is a pulley for applying tension to the timing belt 206.

  On the other hand, as shown in FIG. 10, the holding portion 150 is formed with a large-diameter concave portion 212 facing the mounting plate 154, and a concave portion 214 having the same diameter is formed on the opposite side of the concave portion 212. The recess 212 and the recess 214 communicate with each other through a small diameter hole 216. In this case, the central axis of the recess 212, the hole 216, and the recess 214 is a cross EL axis (XEL axis) 218 along the arrow A direction.

  A hole 220 is formed in the mounting plate 154 coaxially with the XEL shaft 218, and the antenna portion 36 is fixedly supported to the holding portion 150 through the hole 220, the recess 212, the hole 216, and the recess 214. Second fixing means 222 is disposed.

  Specifically, the second fixing means 222 includes a substantially cylindrical spacer 224 disposed in the hole 216 along the XEL shaft 218, and a bearing 226 disposed in the recess 212 coaxially with the XEL shaft 218. A bearing 228 disposed in the recess 214 coaxially with the XEL shaft 218, a screw 230 passing through the hole 220 and passing through the bearing 226, the spacer 224, and the bearing 228, and the screw 230 And an engaging nut 232.

  Further, the second fixing means 222 includes a substantially cylindrical pulley mounting portion 234 through which the screw 230 passes in the arrow A1 direction from the bearing 226, and a pulley 236 fitted to the pulley mounting portion 234. In this case, the pulley 236 is fastened and fixed to the pulley mounting portion 234 by a screw 242 (see FIG. 8).

  Furthermore, between the bearing 228 and the bottom surface 238 of the recess 214 in the arrow A1 direction, a substantially annular Belleville spring 240 as a second pressurizing means is inserted.

  On the other hand, in the center portion of the back surface 252 (FIGS. 2, 5, and 8) of the ground conductor plate 250 that constitutes the antenna section 36 shown in FIGS. 1, 2, 4, 5, and 8, the ground conductor is provided. An antenna attachment portion 254 for fixing and supporting the plate 250 to the holding portion 150 is provided, and the antenna attachment portion 254 is substantially trapezoidal protrusions 256 and 258 protruding in the direction of the arrow C2 (FIGS. 2 and 5). And FIG. 8 to FIG. 10).

  Here, the protruding portion 256 is fastened and fixed to the pulley mounting portion 234 by a screw 260. On the other hand, the screw 261 is fastened and fixed to the nut 232 via the protrusion 258.

  As shown in FIGS. 2, 5, and 8, a timing belt 262 is suspended from the outer peripheral surface of the pulley 236 and the pulley 166 attached to the rotating shaft 164 of the third motor 152.

  Further, the angle sensor 158 shown in FIGS. 2 and 5 includes the rotation angle when the antenna unit 36 rotates in the elevation direction around the EL axis 176 (see FIG. 9), and the XEL axis 218 (see FIGS. 5 and 10). ) And the rotation angle when the antenna portion 36 is rotated in the polarization angle direction, and the detection result is output to an electronic circuit disposed on the angle sensor substrate 160. The electronic circuit outputs a signal indicating the detection result to the RFU 54 via the cable 114 (see FIGS. 1 and 4).

  The antenna unit 36 shown in FIGS. 1, 2, 4, 5, and 8 includes the above-described ground conductor plate 250, the shield case 272 disposed in the center portion of the front surface 270 of the ground conductor plate 250, and A plurality of antennas 274 disposed around the shield case 272 on the front surface 270 and an antenna mounting portion 254 disposed on the back surface 252 of the ground conductor plate 250 are provided.

  The ground conductor plate 250 is a substantially disc-shaped ground plate having an opening at the center thereof, and the outer peripheral portion in the arrow A1 direction and the outer peripheral portion in the arrow A2 direction are bent in the arrow C2 direction. The shield case 272 is shielded together with the ground conductor plate 250, and a receiving circuit (low noise amplifier) and an antenna duplexer (not shown) are built in the shield case 272. In this case, the receiving circuit and the antenna duplexer are electrically connected to the RFU 54 (see FIGS. 4, 6 and 7) by a cable 116 (see FIGS. 1 and 4).

  Further, as shown in FIGS. 1, 4, and 5, each antenna 274 includes a power feeding antenna element 278 disposed on the surface of the electrical insulator 276 fixed to the front surface 270 of the antenna portion 36, and the power feeding antenna. An electric insulator 280 fixed on the element 278 and a parasitic antenna element 282 fixed on the electric insulator 280 are configured. In this case, the antennas 274 are arranged diagonally on the front surface 270 of the ground conductor plate 250, and the parasitic antenna elements 282 are fastened and fixed to the ground conductor plate 250 by screws 284.

  Further, each feeding antenna element 278 is electrically connected to the antenna duplexer in the shield case 272, and both ends of the feeding antenna element 278 are viewed when the antenna unit 36 is viewed from the front surface 270 side. As shown in FIG. 1 and FIG. 4, it protrudes from the electrical insulator 280 and the parasitic antenna element 282. Here, when a signal is output from the RFU 54 (see FIGS. 4, 6, and 7) to each feeding antenna element 278 through the cable 116 (see FIGS. 1 and 4) and the antenna duplexer, The signal is converted into a radio wave in the power feeding antenna element 278, and the converted radio wave is radiated from each power feeding antenna element 278 toward an external geostationary satellite or the like. On the other hand, when each of the feeding antenna elements 278 receives a radio wave from an external geostationary satellite or the like, the received radio wave is converted into a signal and output from the antenna duplexer to the receiving circuit. The receiving circuit amplifies the input signal and outputs the amplified signal to the RFU 54 via the cable 116.

  The antenna device 10 according to the present embodiment is configured as described above. Next, the operation thereof will be described with reference to FIGS.

  First, an operation for cantilevering the second rotating mechanism 34 above the base plate 50 by the frame 90 and fixing and supporting the antenna unit 36 by the second rotating mechanism 34 will be described.

  As shown in FIG. 9, when the screw 190 passes through the hole 188 of the frame 90 and the screw 190 and the nut 192 are engaged, the nut 192 is advanced in the arrow B1 direction using a tool (not shown). A pressing force acts on the surface of the bearing 184 on the arrow B1 direction side from the Belleville spring 200, and the bearing 184 is pressurized. As a result, the so-called rattling of the bearing 184 caused by a dimensional error is compensated by the Belleville spring 200. Accordingly, the holding portion 150 can be securely fixed and supported on the frame 90 by the first fixing means 180.

  On the other hand, as shown in FIG. 10, when the screw 230 passes through the pulley mounting portion 234 and the screw 230 and the nut 232 are engaged, the nut 232 is advanced in the direction of the arrow A1 using a tool (not shown). Then, a pressing force acts on the surface of the bearing 228 on the arrow A2 direction side from the Belleville spring 240, and the bearing 228 is pressurized. As a result, the so-called rattling of the bearing 228 caused by dimensional errors is compensated by the Belleville spring 240. Accordingly, the antenna portion 36 is fixed to the pulley mounting portion 234 via the protruding portion 256 and the screw 260, and the screw 261 is fastened and fixed to the nut 232 via the protruding portion 258, so that the antenna portion 36 is fixed to the holding portion 150. Thus, it is possible to securely fix and support.

  Next, with respect to the antenna device 10, the antenna unit 36 is rotated in the azimuth direction around the AZ axis 68, rotated in the elevation direction around the EL axis 176, and further polarized with the XEL axis 218 as the center. The operation of rotating in the angular direction will be described with reference to FIGS. 1, 2, and 3 to 10.

  First, when the first motor 56 is driven to rotate the rotating shaft 74, the pulley 76 rotates, and the pulley 40 is rotated by the timing belt 78 suspended on the pulley 76. In this case, since the pulley 40 is fixed to the AZ shaft portion 38 and the AZ shaft portion 38 is fixed to the pedestal 14, the pulley 40 is not rotated by the rotational force of the first motor 56. Therefore, this rotational force becomes the rotational force of the base plate 50 and the holding plate 48 that are fastened and fixed to the first motor 56 via the attachment plate 92.

  Therefore, the first motor 56 rotates the rotating shaft 74 so that the base plate 50 and the holding plate 48 are very slowly compared with the rotation speed of the rotating shaft 74 in the no-load state around the AZ shaft 68. The rotating shaft 74 is rotated in the rotational direction, that is, the azimuth direction at the rotational speed described above.

  As described above, the first motor 56 and the base end portion of the frame 90 are fixed to the upper surface of the base plate 50 via the mounting plate 92, and the frame 90 cantileverly supports one end of the second rotating mechanism 34. The second rotating mechanism 34 supports the antenna unit 36. On the other hand, an RFU 54 is fixed to the bottom surface of the base plate 50 via an RFU substrate 52. Therefore, as the base plate 50 rotates, the first motor 56, the frame 90, the second rotation mechanism 34, the antenna unit 36, and the RFU 54 are moved in a desired azimuth direction around the AZ axis 68. Rotate.

  In this case, since the bearing 42 is disposed inside the base plate 50, when the base plate 50 and the holding plate 48 are rotated, friction acting on the rotating shaft 74 is reduced, and the above-described base plate 50 and The holding plate 48 can be smoothly rotated.

  An angle sensor 96 is disposed on the bottom surface of the base plate 50, and the angle sensor 96 measures the rotation angle of the base plate 50 with respect to the pulley 40 when the base plate 50 rotates.

  Accordingly, the antenna unit 36 supported by the frame 90 via the second rotation mechanism 34 also rotates about the AZ axis 68 as the frame 90 rotates, so that the first motor 56 is driven. The rotation of the rotary shaft 74 makes the antenna unit 36 rotatable in a desired azimuth direction.

  Here, if the rotating shaft 74 is rotated by the driving of the first motor 56 and the base plate 50 and the holding plate 48 are rotated around the AZ shaft 68 along with this, the cable 120 connected to the ACU 104 is also connected to the AZ shaft 68. However, since the joint portion of the connector 122 in the rotary joint 124 also rotates around the AZ axis 68, no electrical trouble occurs between the cable 22 and the cable 120.

  Next, when the second motor 134 is driven and the rotary shaft 140 rotates, the pulley 142 also rotates, and the rotational force of the pulley 142 is transmitted to the pulley 204 via the timing belt 206. Here, since the pulley 204 is fixed to the holding portion 150 and the second rotation mechanism 34 including the holding portion 150 supports the antenna portion 36, the pulley 204 is rotated by the timing belt 206. By the rotation, the holding unit 150 and the antenna unit 36 are rotatable in a desired elevation direction around the EL axis 176.

  Further, when the third motor 152 is driven and the rotation shaft 164 rotates, the pulley 166 also rotates, and the rotational force of the pulley 166 is transmitted to the pulley 236 via the timing belt 262. Here, the pulley 236 is fixed to the pulley mounting portion 234, and the pulley mounting portion 234 has the protruding portion 256 fixed via a screw 260. On the other hand, a screw 230 is inserted through the pulley mounting portion 234, and the screw 230 and the nut 232 are engaged. Further, the screw 261 is fastened and fixed to the nut 232 via the protruding portion 258. Therefore, the pulley 204 is rotated by the timing belt 262, and the antenna unit 36 including the ground conductor plate 250 connected to the protrusions 256 and 258 by this rotation has a desired elevation angle around the XEL shaft 218. It becomes free to rotate.

  As described above, the antenna device 10 according to the present embodiment employs a so-called cantilever support structure in which one end of the second rotation mechanism 34 connected to the antenna unit 36 is supported by the support mechanism 32, so that both ends are supported. Compared with the antenna device according to the related art of the structure, the space of the frame 90 as an antenna support portion occupying the entire device is reduced, and the entire device can be easily reduced in size, and easily in a short time. As a result, the vibration resistance can be further improved.

  Further, the Belleville spring 200 as the first pressurizing means pressurizes the bearing 184 of the first fixing means 180, and the Belleville spring 240 as the second pressurizing means only pressurizes the bearing 228 of the second fixing means 222. Since the antenna portion 36 is supported by the first rotation mechanism 30 via the second rotation mechanism 34 and the support mechanism 32, the antenna device 10 can be assembled in a short time in the manufacturing process. In addition, since precise machining such as adjusting the size of the spacer is not necessary, the problem that vibration cannot be suppressed by the dimensional accuracy of the spacer is solved, and the antenna device 10 with higher vibration resistance is realized. can do.

  In the antenna device 10 according to the present embodiment, heat generated from the RFU 54 is transmitted to the frame 90 constituting the support mechanism 32 via the RFU substrate 52 and the base plate 50. This heat is externally transmitted from the frame 90 to the outside. Therefore, it is not necessary to dispose a heat sink or the like as compared with the antenna device according to the prior art, and the heat generated from the RFU 54 can be efficiently radiated even if the whole antenna device 10 is downsized. Further, since the heat sink is not necessary, it is possible to shorten the assembly time of the antenna device 10 in the manufacturing process and reduce the manufacturing cost.

  In addition, since the RFU 54 is disposed via the RFU substrate 52 disposed on the bottom surface of the base plate 50, the antenna can be operated even if the antenna unit 36 is rotated in a desired azimuth angle direction, elevation angle direction, and polarization angle direction. Interference between the unit 36 and the RFU 54 can be avoided. Further, since the RFU 54 is disposed directly below the support mechanism 32 via the base plate 50 and the RFU substrate 52, heat generated in the RFU 54 is transmitted to the frame via the RFU substrate 52 and the base plate 50. However, this heat can be efficiently radiated from the frame 90 to the outside. Also, heat from a power transistor (not shown) mounted in the RFU 54 can be efficiently radiated.

  Furthermore, according to the antenna device 10 according to the present embodiment, the RFU 54 is arranged in a plane from the front surface 270 side to the back surface 252 side of the antenna unit 36 in the first rotation mechanism 30, so that by swinging a ship or the like The RFU 54 can suppress vibrations that occur and vibrations that occur when the first rotation mechanism 30 is rotated. Further, since the RFU 54 is disposed at a position lower than the antenna unit 36, the RFU 54 is not connected to the antenna unit even if the antenna unit 36 is rotated in a desired azimuth angle direction, elevation angle direction, and polarization angle direction. The antenna pattern from 36 will not interfere. Therefore, even if the antenna device 10 is downsized, it is possible to avoid interference with the antenna pattern and suppress various vibrations.

  The antenna unit 36 is disposed above the base plate 50 via the support mechanism 32 and the second rotation mechanism 34, while the RFU 54 is disposed via the RFU substrate 52 disposed on the bottom surface of the base plate 50. Therefore, even if the antenna unit 36 is rotated in a desired azimuth angle direction, elevation angle direction, and polarization angle direction, the RFU 54 does not interfere with the antenna pattern from the antenna unit 36.

  Further, since the first motor 56 is disposed on the back surface 252 side of the antenna unit 36 in the first rotating mechanism 30, that is, in the vicinity of the base end portion of the frame 90, the first motor 56 is not limited even if the antenna device 10 is downsized. The motor 56 does not interfere with the antenna pattern.

  Furthermore, in the antenna device 10 according to the present embodiment, the first motor 56 and the frame 90 are disposed on the upper surface of the base plate 50 constituting the bearing housing portion 51, and the RFU substrate 52 is disposed on the bottom surface of the base plate 50. Since the RFU 54 is arranged, it is possible to reduce the space for arranging these components as compared with the antenna device according to the prior art, and to easily achieve downsizing of the entire device. it can. Further, since the base plate 50 functions as a shield part of the RFU 54, the shield of the RFU 54 can be easily realized.

  Of course, the antenna device according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is the perspective view which looked at the antenna apparatus which concerns on this embodiment from the front side of the antenna part. It is the perspective view which looked at the antenna apparatus of FIG. 1 from the back side of the antenna part. It is a perspective view of the radar dome which accommodates the antenna apparatus shown in FIG. FIG. 2 is a front view of the antenna device of FIG. 1 in a state where illustration of a pedestal of a radar dome is omitted. It is a side view of the antenna apparatus shown in FIG. It is a bottom view of the antenna apparatus of FIG. It is sectional drawing along the VII-VII line of FIG.1 and FIG.2. It is a principal part perspective view which shows a 2nd rotation mechanism. It is sectional drawing along the IX-IX line of FIG. It is sectional drawing along the XX line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Antenna apparatus 30 ... 1st rotation mechanism 32 ... Support mechanism 34 ... 2nd rotation mechanism 36 ... Antenna part 38 ... Horizontal rotating shaft part 40, 76, 142, 166, 204, 236 ... Pulley 42, 184, 186, 226 228 ... Bearings 44, 46 ... Bearing holding plate 48 ... Holding plate 50 ... Base plate 51 ... Bearing housing 52 ... RFU substrate 54 ... RFU
56, 134, 152 ... motor 68 ... AZ shaft 74, 140, 164 ... rotating shaft 78, 206, 262 ... timing belt 90 ... frame 92, 154, 156 ... mounting plate 104 ... ACU 106 ... GPS unit 150 ... holding part 176 ... EL shaft 180 ... first fixing means 182,224 ... spacers 190,230 ... screws 192,232 ... nuts 194,196 ... spacer 200,240 ... Belleville spring 209 ... idler pulley 218 ... XEL shaft 222 ... second fixing means 234 ... Pulley mounting portion 250 ... Ground conductor plate 252 ... Back surface 254 ... Antenna mounting portion 256, 258 ... Projection portion 270 ... Front surface 272 ... Shield case 274 ... Antenna 276, 280 ... Electric insulator 278 ... Power feeding antenna element 282 ... None Antenna element for feeding

Claims (2)

A first rotation mechanism for adjusting the azimuth;
A support mechanism in which a base end portion is fixed to an upper surface of the first rotation mechanism, and a tip end portion extends above the first rotation mechanism;
A second rotating mechanism whose one end is cantilevered above the first rotating mechanism via the tip of the supporting mechanism and adjusts an elevation angle and a polarization angle;
An antenna unit supported by the second rotation mechanism and rotatable in a desired azimuth angle direction, elevation angle direction, and polarization angle direction by the first rotation mechanism and the second rotation mechanism;
An antenna device comprising: The antenna device according to claim 1, wherein
The second rotation mechanism includes:
First fixing means for fixing the second rotating mechanism to the support mechanism;
First pressurizing means for suppressing vibration between the second rotating mechanism and the support mechanism by pressurizing the first fixing means;
Second fixing means for fixing the antenna unit to the second rotating mechanism;
Second pressurizing means for suppressing vibration between the second rotating mechanism and the antenna unit by pressurizing the second fixing means;
An antenna device comprising:

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