JPS6218972Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention generally relates to a rotation mechanism for an FM antenna, and more particularly to a rotation mechanism for an electric field type antenna combined with a ferrite antenna.

Electric field type used indoors as a tabletop
FM antennas are generally installed in a fixed position by adjusting the position of the dipole antenna to obtain the maximum electric field, so the direction of the antenna cannot be changed arbitrarily. Therefore, in areas where there are many broadcasting stations, it is difficult to orient the antenna in the direction in which the radio waves arrive each time you select a station. In some cases, the antenna itself may not be oriented in the direction of maximum electric field.

Based on the above points of view, the present applicant previously proposed a rotation mechanism for an FM antenna that allows easy direction adjustment in Japanese Patent Application No. 54-077512 and Japanese Patent Application Laid-open No. 56-2706.
The present invention is a further development in this regard.

The purpose of the present invention is to provide an antenna rotation mechanism that allows easy direction adjustment.The present invention is characterized by a box-like shape having a substantially horizontal top and bottom surface, and a substantially horizontal top and bottom surface. A case having a single circular hole in the center and an opening at the top of a box-shaped side surface, and a notch having an L-shaped cross section around the periphery, and connecting the notch and the edge of the hole of the case. a substantially circular rotary support plate that is rotatably and slidably engaged; a substantially cylindrical support leg provided approximately in the center of the upper surface of the rotary support plate; and a substantially cylindrical support leg provided coaxially with the support plate on the back surface of the rotary support plate. a single gear that is fixed and partially protrudes from the opening; a spring that has one end fixed to the inner wall of the case and the other end that presses the teeth of the gear; an electric field type antenna formed with a metal pattern on the antenna support substrate; a cap provided on the top of the support leg for pressing and fixing the antenna support substrate from above; and the rotation support. A hollow cylindrical bobbin provided vertically at the center of the back of the plate, a coupling coil wound around the bobbin and connected to the antenna, one end fixed to the bottom of the case and the other end fixed to the hollow part of the bobbin. The antenna rotation mechanism includes a substantially cylindrical ferrite rod into which a bobbin is rotatably inserted, and a ferrite antenna having an antenna coil mounted on the ferrite rod. Examples will be described below with reference to the drawings.

FIG. 1 is an embodiment of the antenna rotating mechanism according to the present invention, and FIG. 2 is an explanatory diagram of the assembly of the rotating part. 1st
In the figures and FIG. 2, 1 is a box-shaped case having a substantially horizontal top and bottom surface, a single hole 1a approximately in the center of the top surface, and an opening at the top of the side surface. Reference numeral 2 denotes a rotary support plate, which has a notch 2c having an L-shaped cross section on its circumferential surface, and is formed into a substantially circular shape with a diameter of the back surface smaller than that of the top surface. The rotary support plate 2 having the above structure is provided on the upper surface of the case 1 by rotatably and slidingly engaging the edge 1b of the hole 1a of the case 1 and the notch 2c.

The rotation support plate 2 has almost cylindrical support legs 2 on the upper surface.
a, and the metal pattern 6 is inserted through the support leg 2a.
An antenna support substrate 6 having an array of a is provided on the upper surface of the rotation support plate 2. 5 is a cap that presses and fixes the antenna support board 6 from above, and the support leg 2
It is provided at the top of a. Reference numeral 3 denotes a single gear, which is fixed coaxially with the rotary support substrate 2 on the back surface of the rotation support substrate 2, for example, by screwing or the like. The gear 3 is configured to be stopped at each pitch by a spring 4 whose one end is fixed to the inner wall of the case 1. Furthermore, the gear 3 is configured to be stopped at each pitch by a spring 4 whose one end is fixed to the inner wall of the case 1. 3 protrudes from the opening of the case 1.

Incidentally, the attachment of the gear 3 to the rotation support plate 2 is performed, for example, as follows. At least one of the top and bottom surfaces of the case 1 can be used as a top cover (or bottom cover) and can be attached to a side surface of the case 1 with screws or the like. Engage the notch 2a of the rotation support plate 2 with the hole 1a of the top cover, and screw the gear 3 from the opposite side of the top cover through the hole of the gear 3 (Fig. 2) into the screw hole of the rotation support plate 2. Finally, attach the top cover to the side of case 1.

The rotary support plate 2 further includes a hollow cylindrical bobbin 2b vertically provided at the center of the back surface. A coupling coil 7 connected to a metal pattern 6a is wound around the bobbin 2b, and electromagnetically couples the ferrite antenna and the electric field antenna. The ferrite antenna has a substantially cylindrical ferrite rod 8 whose one end is fixed to the bottom surface of the case 1 and whose other end is inserted into the hollow part of the bobbin 2b so that the bobbin 2b can be rotated.
and a tuning circuit 8 provided in the ferrite rod 8.
a and an output coil 8b.

If the present invention is configured as described above, the antenna can be easily rotated, and since the rotation angle of the antenna is controlled for each pitch of the gear, it can be securely fixed at a position where the maximum electric field can be obtained. , it is possible to prevent the antenna position from moving due to some impact. Although the electric field type antenna is mounted on the rotation support leg in a vertical plane, it is also possible to install it on the rotation support leg in a horizontal plane.

As explained above, in the antenna rotation mechanism according to the present invention, the electric field type antenna coupled with the ferrite is configured to be rotatable, so the antenna can be rotated in any direction, and therefore, the antenna can be rotated in the direction where the maximum electric field is obtained. Adjustment can be made easily and the antenna can be reliably fixed at a position where the maximum electric field can be obtained. Therefore, the present invention is particularly effective in multi-station areas where radio waves arrive in different directions depending on the station.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the antenna rotating mechanism according to the present invention, and FIG. 2 is an explanatory diagram of the assembly of the rotating part. DESCRIPTION OF SYMBOLS 1... Case, 1a... Hole, 2... Rotation support plate, 2a... Support leg, 2b... Bobbin, 3... Gear, 4... Spring, 5... Cap, 6... Antenna support board, 7... Coupling coil, 8... Ferrite rod, 8a... Tuning circuit, 8b... Output coil.

Claims (1)

[Scope of utility model registration request] A box-shaped case with a nearly horizontal top and bottom surface, a single circular hole in the center of the top surface, and an opening at the top of the box-shaped side, and a case with an L-shaped cross section around the periphery. a substantially circular rotating support plate having a notch and rotatably slidingly engaging the notch with the edge of the hole in the case; and a substantially cylindrical rotating support plate provided approximately at the center of the upper surface of the rotating support plate. a support leg, a single gear fixed coaxially with the support plate on the back surface of the rotary support plate and partially protruding from the opening, and one end fixed to the inner wall of the case and the other end the teeth of the gear. an antenna support substrate provided on the upper surface of the rotary support plate via the support legs; an electric field type antenna formed with a metal pattern on the antenna support substrate; and a spring that presses the antenna support substrate from above. a cap provided on the upper part of the support leg for fixing; a hollow cylindrical bobbin provided vertically at the center of the back surface of the rotary support plate; a coupling coil wound around the bobbin and connected to the antenna; The ferrite antenna comprises a substantially cylindrical ferrite rod having one end fixed to the bottom surface of the case and the other end rotatably inserted into the hollow portion of the bobbin, and a ferrite antenna having an antenna coil attached to the ferrite rod. Features an antenna rotation mechanism.