JP2006229551A - Antenna apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an antenna apparatus having a rotation stopping mechanism in which a failure hardly occurs with few number of parts by rotating an antenna in a limited range of rotation angle. <P>SOLUTION: A movable side block 10 is formed on the periphery (a) of an azimuth shaft 3 center. In a cam 12, a movable side connecting part 13 is provided on the periphery (a), and a securing side connecting part 14 is provided on the periphery (b) of the azimuth shaft 3 center. A securing side block 15 is located on the periphery (b). The movable side block 10 is brought into contact with the movable side connecting part 13 provided in the cam 12 by the rotation of the movable part 8 around the azimuth shaft 3. Further, the securing side connecting part 14 provided in the cam 12 is brought into contact with the securing side block 15 by further rotating the cam 12 together with the movable side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device mounted on a moving body such as a ship, for example, and relates to an antenna device that rotates an antenna within a finite rotation angle range.

  For example, Japanese Patent Application Laid-Open No. 2002-185225 discloses a conventional rotation stop mechanism for an antenna device, which secures a driving angle of +180 degrees to −180 degrees around an azimuth axis, and is mechanical at approximately +270 degrees positions and −270 degrees positions. A mechanism for stopping automatically is disclosed. The rotation stop mechanism described in this publication is provided on the antenna rotation side, and a striker provided on the circumference centered on the azimuth axis is provided on the antenna fixing side, and on the circumference centered on the azimuth axis. It collides with a stopper on the antenna fixing side provided at the +270 degree position and the −270 degree position and mechanically stops. For example, the striker rotates in the + direction and stops by colliding with a + side stopper provided at a position of +270 degrees, and a − side stopper is provided in the middle of the rotation. The striker contact member is formed of a rotating flat plate so that the striker can pass without mechanically colliding with the negative stopper. That is, the flat plate is in a horizontal position with respect to the circumferential direction when the striker passes the-side stopper, and rotates so that it is perpendicular to the circumferential direction when the striker contacts the + side stopper. It abuts against the side stopper. In this way, since the flat plate is rotated between the − side stopper and the + side stopper from the horizontal to the vertical position with respect to the circumferential direction, a cam switch is provided between the − side stopper and the + side stopper. Is provided. The flat plate is provided with an arm that rotates together with the flat plate. The arm contacts the cam switch and rotates 90 degrees, and the flat plate rotates 90 degrees in accordance with the movement of the arm.

JP 2002-185225 A

  As described above, the rotation stopping mechanism of the conventional antenna device is provided with the flat plate, the arm, and the components that support the rotation inside the striker, and further, the square cam for stopping the rotation of the flat plate and the arm at each 90 degree position. And weight parts are required, the mechanism is complicated, and the number of parts is large. The large number of parts also affects the reliability of the mechanism, and it can function stably when such a stop mechanism does not operate frequently. When the antenna azimuth frequently changes in an antenna device or the like mounted on the body, these rotation stop mechanisms operate frequently, and there is a problem that malfunctions due to wear and displacement are likely to occur. Also, the flat plate and the arm do not rotate unless a certain load is applied due to the square cam and weight, but due to the posture change and external force that occurs in the moving body, a certain load or more is applied to the flat plate and the arm. When the flat plate rotates, the antenna can no longer be rotated in the range of +180 degrees to -180 degrees.

  The present invention has been made to solve the above-described problems, and an antenna device having a rotation stopping mechanism that rotates an antenna in a finite rotation angle range and has a small number of parts and is unlikely to cause a failure. With the goal.

  An antenna device according to a first aspect of the present invention is provided with a movable part having an antenna, a fixed-side member that rotatably supports the movable part around an axis, and the shaft provided by rotation of the movable part. A movable side block that moves on a first circumference centered on the axis, a fixed side block that is provided on the fixed side member and that is provided on a second circumference centered on the axis, and around the axis A cam provided rotatably, and the cam is provided on a movable side abutting portion provided on the first circumference and on the second circumference, and is movable by rotation of the movable portion. When the side block and the movable side contact portion are in contact with each other and rotate, the second block moves on the second circumference and includes a fixed side contact portion that contacts the fixed side block.

  The antenna device according to a second aspect of the present invention is the antenna device according to the first aspect of the invention, wherein the movable contact portion and the fixed contact portion of the cam protrude outward in the radial direction about the shaft center. And a contact surface perpendicular to the circumferential direction of the shaft center is formed.

  The antenna device according to a third aspect of the present invention is the antenna device according to the first aspect of the invention, wherein the movable contact portion and the fixed contact portion of the cam are axially arranged on a circumference of the shaft center. And a contact surface perpendicular to the circumferential direction of the shaft center is formed.

  The antenna device according to a fourth aspect of the present invention is the antenna device according to the first aspect of the present invention, wherein the movable side block and the fixed side block include a limit switch for pressing the switch in a radial direction of the axis center. In the cam, the movable contact portion and the fixed contact portion protrude outward in the radial direction about the shaft center, and the limit switch is pressed down by the respective outer peripheral surfaces.

  According to the first to fourth aspects of the invention, due to the rotation of the movable portion, the movable side block and the movable side abutting portion provided on the cam abut on the first circumference, and the second circle Since the fixed side abutting part provided on the cam contacts the fixed side block and the movable part stops rotating on the circumference, the movable part can be driven within a predetermined angle range, and the number of parts is small and reliable. It is possible to improve the performance.

Embodiment 1

  An antenna device according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is an external view showing an external appearance of an antenna apparatus according to Embodiment 1 of the present invention. 2 is an external view of the rotation stop mechanism portion of the antenna device according to Embodiment 1 of the present invention, and FIG. 3 is a cross-sectional view of the rotation stop mechanism portion of the antenna device according to Embodiment 1 of the present invention. is there. FIG. 4 is a schematic diagram for explaining the operation of the rotation stopping mechanism of the antenna device according to Embodiment 1 of the present invention. In FIG. 1, 1 is an antenna, 2 is an electronic device provided under the antenna such as a transceiver, 3 is an azimuth axis, 4 is a cross axis, and 5 is an elevation axis. The electronic device 2 is an aggregate of, for example, a high-frequency circuit that transmits and receives signals and performs frequency conversion processing, a baseband processing circuit, and an antenna driving device that controls rotation driving of the antenna 1. Further, in the antenna device shown in FIG. 1, it rotates around the azimuth axis 3 with respect to the fixed portion 6, further rotates around the cross axis 4, and around the elevation axis 5 (axis perpendicular to the paper surface of FIG. 1). To rotate. By this three-axis drive, for example, communication is performed by tracking a communication partner such as a communication satellite. There are various drive axis settings, including antenna driving with an azimuth axis and an elevation axis, and antenna driving with a horizontal axis and a cross axis. 7 is a rotation stop mechanism.

  In FIG. 2, 8 is a movable part, and the movable part 8 rotates around the azimuth axis 3. Reference numeral 9 denotes a flange fixed to the movable portion 8, and reference numeral 10 denotes a movable side block fixed to the flange 9, on the circumference of 1 around the center of the azimuth shaft 3 (this circumference is referred to as “circumference A”). Provided. Reference numeral 11 denotes a limit switch fixed to the movable block 10. Reference numeral 12 denotes a cam which is formed in a ring shape and is supported by the fixed portion 6 so as to be rotatable around the azimuth shaft 3. In the cam 12, 13 is a movable side abutting portion projecting radially outward on the circumference of the cam 12, and is located on the circumference a. Reference numeral 14 denotes a fixed-side abutting portion that protrudes on the circumference of the cam 12 and is provided on a circumference of 1 at the center of the azimuth shaft 3 (this circumference is referred to as “circumferential round”). Circumference A and circumference B are circumferences of the same radius at the center of the azimuth axis 3 but are offset in the direction of the azimuth axis 3. Reference numeral 15 denotes a fixed side block fixed to the fixed portion 6 and is located on the circumference b. Reference numeral 16 denotes a limit switch fixed to the fixed block 15. The movable side block 10 contacts the movable side contact portion 13 provided on the cam 12 by the rotation of the movable portion 8 around the azimuth shaft 3, and the fixed side contact portion 14 provided on the cam 12 moves the cam 12. Rotate with the side and abut against the fixed side block 15. In FIG. 3, reference numeral 17 denotes a shaft fixed to the fixed portion 6, and forms a fixed side together with the fixed portion 6. 18 and 19 are bearings provided on the shaft 17, 20 is a motor, and 21 is a rotary encoder for angle detection provided on the movable part side. The movable portion 8 is supported on the shaft 17 (fixed side) so as to be rotatable around the azimuth shaft 3 via the bearing 17 and the bearing 18, and is rotated around the azimuth shaft 3 by a motor 20. Detected by. Reference numeral 22 denotes a bearing provided on the shaft 17, and the cam 12 is rotatably supported by the bearing 21.

Next, the operation of the rotation stopping mechanism of the antenna device according to the present invention will be described with reference to FIG. FIG.
(A) thru | or FIG.4 (f) is a cross section seen from the AA cross section shown in FIG. 1, and shows the state of the rotation stop mechanism 7 in each rotation angle. The state shown in FIG. 4A is a state where the azimuth angle is 0 degree. FIG. 4B shows a state in which the movable portion 8 is rotated to an azimuth angle of +125 degrees by driving the motor 20 from this state. The movable side block 10 rotates together with the movable portion 8, and the movable side block 10 and the movable side abutting portion 13 are on the same circumference. Therefore, as shown in FIG. It contacts the movable contact portion 13. The movable side abutting portion 13 has both end faces that are substantially orthogonal to the circumferential direction, and abuts the movable side block 10 at one end face. When the movable part 6 rotates around the azimuth shaft 3 to the minus side, the movable block 10 contacts the other end surface of the movable contact part 13. Further, in the state of FIG. 4B, the limit switch 11 comes into contact with the circumferential surface of the movable contact portion 13 and the switch state is turned on.

  FIG. 4C shows a state where the rotation further proceeds and the azimuth angle of the movable portion 8 becomes +280 degrees. Since the fixed-side contact portion 14 provided on the cam 12 and the fixed-side block 15 are positioned on the same circumference, they contact each other as shown in FIG. The fixed-side contact portion 14 has both end surfaces that are substantially orthogonal to the circumferential direction, and contacts the fixed-side block 15 at one end surface. When the movable part 6 rotates around the azimuth shaft 3 to the minus side, the fixed side block 15 contacts the other end surface of the fixed side contact part 14. In the state of FIG. 4C, the limit switch 16 comes into contact with the circumferential surface of the fixed-side contact portion 14, and the switch state is turned on. Thus, when the fixed side contact portion 14 provided on the cam 12 contacts the fixed side block 15, the rotation of the movable portion 6 stops at the azimuth angle +280 degrees position.

  Next, FIG. 4D shows a state in which the movable portion 6 rotates to the minus side around the azimuth axis 3 from the state of FIG. Although the movable block 10 moves away from the cam 12 and moves on the circumference (i) by the rotation of the movable portion 6 to the minus side, the cam 12 remains in the state shown in FIG. FIG. 4E shows a state where the rotation further proceeds and the azimuth angle of the movable portion 8 becomes −90 degrees. The movable block 10 contacts the movable contact portion 13 provided on the cam 12 and rotates together with the cam 12 to the minus side. Further, in the state of FIG. 4E, the limit switch 11 contacts the circumferential surface of the movable contact portion 13, and the switch state is turned on.

  FIG. 4F shows a state in which the rotation further proceeds and the azimuth angle of the movable portion 8 is −280 degrees. In this state, the fixed side contact portion 14 provided on the cam 12 and the fixed side block 15 come into contact. Further, in the state of FIG. 4F, the limit switch 16 comes into contact with the circumferential surface of the fixed side contact portion 14, and the switch state is turned on. Thus, when the fixed side contact portion 14 provided on the cam 12 contacts the fixed side block 15, the rotation of the movable portion 6 stops at the azimuth angle of −280 degrees.

  As described above, the movable portion 6 is moved around the azimuth shaft 3 within a predetermined angular range by the movable block 10, the movable contact portion 13 and the fixed contact portion 14 provided on the cam 12, and the fixed block 15. And can be mechanically stopped at the positions -280 and +280 degrees. The rotation stopping mechanism 7 configured in this way has a smaller number of parts than that of the prior art, has good manufacturability, and improves reliability. Moreover, since the main sliding component is the bearing 22, there are few causes of failure.

  A total of two limit switches 11 are provided on each side of the movable part block 10. That is, the limit switch 11 is pressed by the movable contact portion 13 by turning on the azimuth + side and turned on by the switch, and the limit switch 11 is pushed by the movable contact portion 13 by turning on the azimuth and turned on. Consists of a negative switch. Further, one limit switch 16 is provided on each side of the fixed block 15 for a total of two. That is, the limit switch 16 is pressed by the fixed-side contact portion 14 by turning on the azimuth + side and turned on, and the switch 16 is pressed by the fixed-side contact portion 14 when turning on the azimuth-side and turned on. Consists of a negative switch. At the time of azimuth + side rotation, energization to the motor 20 is turned off when both the plus side switch of the limit switch 11 and the plus side switch of the limit switch 16 are turned on. Further, during the azimuth-side rotation, the energization to the motor 20 is turned off when both the minus side switch of the limit switch 11 and the minus side switch of the limit switch 16 are turned on. Thus, by turning off the energization to the motor 20 by pressing the limit switch, the energization to the motor 20 is turned off at the limit position of the azimuth rotation angle range to suppress power consumption, and at the rotation stop position. Failure due to heat generation of the motor 20 can be prevented. In addition, if the position where the switch of the limit switch 16 is turned on is slightly inside the limit position of the azimuth rotation angle range, the limit position, that is, the mechanical stop position (fixed side contact portion 14 and fixed side block 15). Until the contact with the motor 20 is turned off by the inertia of the movable part after the power supply to the motor 20 is turned off. For example, if the limit switch 16 is turned on at the azimuth angles of −270 degrees and +270 degrees, the mechanical stop is performed by inertia until the azimuth angles of −280 degrees and +280 degrees are stopped. To do.

Embodiment 2

  In the first embodiment, the arrangement of the movable side contact part 13 and the fixed side contact part 14 of the cam 12 is provided on the circumference A and the circumference B, respectively. The circumference of the center of the azimuth shaft 3 is the same radius and is offset in the direction of the azimuth shaft 3. However, the arrangement of the movable side contact portion 13 and the fixed side contact portion 14 of the cam 12, Further, the arrangement of the circumference b is not limited to that shown in the first embodiment. In the second embodiment, another example of the arrangement in the rotation stopping mechanism 7 is shown, but the other antenna device configurations are the same as those in the first embodiment.

  FIG. 5 is an external view of the cam 12 of the antenna device according to Embodiment 2 of the present invention. In FIG. 5A, the circumference A and the circumference B have the same radius with the azimuth axis 3 as the center and are offset in the direction of the azimuth axis 3, and are arranged on the movable side contact portion 13 and the fixed side. The case where the contact part 14 is projected from the ring-shaped base member of the cam 12 in the azimuth axis 3 direction is shown. The movable side block 10 is positioned on the circumference A and the fixed side block 15 is positioned on the circumference B, and the end surfaces of the movable side contact portion 13 and the fixed side contact portion 14 (the hatched portion shown in FIG. 5A). ). In FIG. 5 (b), the circumference A and the circumference B are circumferences of different radii at the center of the azimuth shaft 3, and are arranged without being offset in the direction of the azimuth shaft 3, and the movable side contact portion 13 and the fixed The case where the side contact part 14 is projected from the base member of the cam 12 outward in the radial direction at the center of the azimuth shaft 3 is shown. The movable side block 10 is positioned on the circumference A and the fixed side block 15 is positioned on the circumference B, and the end surfaces of the movable side contact portion 13 and the fixed side contact portion 14 (the hatched portion shown in FIG. 5B). ). In FIG. 5 (c), the circumference A and the circumference B are circumferences of different radii at the center of the azimuth shaft 3, and are arranged offset in the direction of the azimuth shaft 3, and the movable side contact portion 13 and the fixed side are arranged. A case where the abutting portion 14 protrudes from the base member of the cam 12 in the azimuth axis 3 direction is shown. The movable side block 10 is positioned on the circumference A and the fixed side block 15 is positioned on the circumference B, and the end surfaces of the movable side contact portion 13 and the fixed side contact portion 14 (the hatched portion shown in FIG. 5C). ).

  As shown in the second embodiment, the cam 12 can have various shapes depending on the positional relationship between the circumference A and the circumference B. The configuration of the rotation stop mechanism 7 is different from that of the other antenna device mechanism. It can be set as the structure corresponding to the restrictions by arrangement | positioning relationship.

  In the first and second embodiments, the rotation stop mechanism used for stopping the rotation of the movable portion 6 with respect to the azimuth shaft 3 has been described. However, the rotation axis is not limited to the azimuth shaft. The rotation stopping mechanism 7 described above can be provided around the cross shaft, the elevation shaft, the horizontal shaft, etc. of the antenna device.

It is an external view which shows the external appearance of the antenna apparatus which concerns on Embodiment 1 of this invention. It is an external view of the rotation stop mechanism part of the antenna apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the rotation stop mechanism part of the antenna device which concerns on Embodiment 1 of this invention. It is a schematic diagram explaining operation | movement of the rotation stop mechanism of the antenna apparatus which concerns on Embodiment 1 of this invention. It is an external view of the cam of the antenna apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Electronic device 6 Fixed part 7 Rotation stop mechanism 8 Movable part 10 Movable side block 11, 16 Limit switch 12 Cam 13 Movable side abutting part 14 Fixed side abutting part 15 Fixed side block

Claims (4)

A movable part having an antenna, a fixed-side member that supports the movable part so as to be rotatable around an axis, and provided on the movable part, on a first circumference around the axis by the rotation of the movable part. A movable side block that moves, a fixed side block that is provided on the fixed side member and that is provided on a second circumference centered on the axis, and a cam that is rotatably provided about the axis. The cam is provided on the first circumference with a movable side abutting portion and on the second circumference, and the movable side block and the movable side abutting portion are moved by rotation of the movable portion. An antenna device comprising: a fixed-side contact portion that moves on the second circumference by contacting and rotating and contacts the fixed-side block. The movable side contact portion and the fixed side contact portion of the cam are projected outward in the radial direction of the shaft center to form a contact surface orthogonal to the circumferential direction of the shaft center. The antenna device according to claim 1. The movable contact portion and the fixed contact portion of the cam are projected in the axial direction on the circumference of the shaft center to form a contact surface orthogonal to the circumferential direction of the shaft center. The antenna device according to claim 1. The movable side block and the fixed side block include a limit switch that is pressed down in a radial direction of the shaft center, and the cam has the movable side contact portion and the fixed side contact portion have the shaft center. The antenna device according to claim 1, wherein the limit switch is pressed down by each outer peripheral surface.

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