JPH0119447Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is applicable to, for example, television receivers and FM
This relates to an indoor antenna that is used by placing it on the top of a receiver or by attaching it to a vertical wall or pillar.

Some conventional indoor antennas have a box-shaped main body with a loop antenna fixed thereon as a UHF antenna element perpendicular to the upper surface of the main body. This kind of indoor antenna can receive radio waves well when used by placing the main body on the top surface of the television receiver so that it is parallel to the top surface of the receiver. When installed on a wall or pillar so that the box-shaped main body is parallel to the vertical surface of the wall or pillar, the loop antenna is fixed to the top surface of the main body, so the directivity of the loop antenna is similar to that of the TV. This was different from when it was placed on the top of the digital receiver, and radio waves could not be received well.

The purpose of this invention is to provide an indoor antenna that can receive good reception whether it is placed on top of a television receiver or FM receiver, or when attached to a wall or pillar.

This invention will be explained below based on two illustrated embodiments. A first embodiment is shown in FIGS. 1 to 5. In FIG. 1, reference numeral 2 denotes a main body formed, for example, in the shape of a rectangular parallelepiped, and this consists of an upper part 4 and a lower part 6, and a bottom surface 8 of the lower part 6 is provided with a main body so that the bottom surface 8 is parallel to the top surface of the television receiver. A suction cup 10 for arranging the main body part 2 is attached, and a third mounting hole 12 is provided on the bottom surface 8 for mounting the main body part 2 so that the bottom surface 8 is parallel to the vertical plane of a column or wall.
The holes are drilled as shown in the figure.

At both rear ends of the lower part 6 of the main body part 2, supporting disk bodies 14 are provided so as to protrude rearward, and a hole 15 bored at the center of these disk bodies 14 has, for example, a cylindrical shape. The antenna mounting body 16 is rotatably supported around an axis along the bottom surface 8 by inserting support shafts 18 provided at the center of both end faces of the antenna mounting body 16 formed in the above. A rectangular loop antenna 20 is fixed to the central part of the outer peripheral surface of the antenna mounting body 16, and a circular loop antenna 22 is attached to the upper surface of the main body 2 by turning a knob 24. It is mounted so that it rotates in a plane parallel to . This knob 24 is provided on a base portion 25 provided on the body portion 16, as shown in FIG. This base part 2
5, when the loop antenna 20 is perpendicular to the bottom surface 8, it comes into contact with the upper part 4 and prevents the body part 16 from tilting toward the main body part 2 side. These loop antennas 20, 22
Used as a UHF antenna. Note that the reason why the circular loop antenna 22 is made rotatable is to ensure that radio waves can be received well even if the radio waves are reflected and refracted. Rod antennas 26 are attached to both outer sides of the rectangular loop antenna 20, and these rod antennas 26 can be turned in the direction shown by the arrow 28 in FIG. 1 and can be extended upward, and are used as VHF antennas. used as.

As shown in FIG. 3, a protruding piece 32 that protrudes rearward is formed at a position slightly inside the supporting disc 14 at the lower edge of the rear surface of the lower part 6 of the main body part 2, and at its tip. As shown in FIG. 5, a projection 34 facing upward is formed. Five engagement grooves 36a to 36e are formed on the outer peripheral surface near both ends of the antenna mounting body 16 so as to be engageable with the protrusion 34. These grooves 36a to 36e are sequentially provided at predetermined angles from a position of 180° to a position of 90° counterclockwise with respect to the mounting positions of the loop antennas 20, 22 and the rod antenna 26. The projecting piece 32 and the protrusion 34 are made of synthetic resin and are integrally formed with the lower part 6 of the main body part 2, and the locking grooves 36a to 36e
The antenna mounting body 16 in which the antenna mounting body 16 is formed is also made of synthetic resin. These protrusions 34, locking grooves 3
6a to 36e constitute a step locking device 38.

40 is a rotary switch, which is attached to the upper part 4 of the main body 2.
It is provided to change the directional characteristics of these antennas by changing the connection between the two rod antennas 26 and the connections between the loop antennas 20 and 22.

When the indoor antenna configured as described above is used by installing it on the top surface of a television receiver, for example, the projection 34 is engaged with the engagement groove 36a, and the fourth
Loop antennas 20, 22 as shown by solid lines in the figure
and a rod antenna 26 is arranged perpendicular to the bottom surface 8 of the lower part 6 of the main body part 2. In addition, in this state, the rod antenna 26 is extended and the arrow 2
If VHF cannot be received well even after turning in eight directions, or if UHF cannot be received well even after rotating the loop antenna 22, rotate the body 16 clockwise and disengage the protrusion 34. By sequentially engaging the matching grooves 36b to 36e, that is, by sequentially changing the inclinations of the rod antenna 26 and the loop antennas 20 and 22, the rod antenna 26 and the loop antenna 20, which can receive VHF and UHF signals well, are installed.
All you have to do is find the slope of 22.

In addition, when using this indoor antenna by mounting it on a vertical surface such as a wall or pillar using the mounting hole 12,
As shown by the solid line in FIG. 4, the loop antenna 20,
22 etc. are arranged at right angles to the bottom surface 8 of the lower part 6 of the main body part 2, the protrusion 34 fits into the engagement groove 3.
6e, rotate the antenna mounting body 16 clockwise until the loop antennas 20, 22 and the rod antenna 26 are oriented at 180 degrees with respect to the bottom surface 8 of the lower part 6 of the main body 2, as shown by the dotted lines in FIG. Arrange them so that they form an angle. Note that even in this state, if VHF or UHF cannot be received well, rotate the body 16 counterclockwise and engage the protrusions 34 in the engagement grooves 36d to 36a in sequence, that is, the rod antenna 26 or the loop antenna 20. Rod antenna 2 that can receive good reception by changing the inclination of , 22
6. Find the inclination of the loop antennas 20 and 22.

FIG. 6 shows a second embodiment. The second embodiment has the same structure as the first embodiment except that the structure of the step locking device 42 is different. Equivalent parts are given the same reference numerals and their explanations will be omitted. The stage locking device 42 is
1 provided symmetrically on both end faces of the antenna mounting body 16
Consisting of a pair of protrusions 44, 44 and engagement holes 46a to 46d drilled in the supporting disc 14, using this stage locking device 42, the loop antennas 20, 22, The rod antenna 26 is positioned at 90 degrees with respect to the bottom surface 8 of the lower part 6 of the main body 2.
Can be locked at various angles between 180° positions.

These indoor antennas rotatably support the antenna mounting body 16 to which the antenna is attached, and the antenna is positioned at 90 degrees with respect to the bottom surface 8 of the lower part 6 of the main body 2 by step locking devices 38 and 42. and main body part 2
Since it can be locked at a 180° angle on the opposite side, radio waves can be received well whether it is placed on top of a television receiver or mounted on a vertical surface of a pillar or wall. In addition, since the body 16 can be locked at various angles between the 90° position and the 180° position, the antenna can be locked even if reception is not good at the 90° or 180° positions. Good reception can be achieved by tilting the signal. Furthermore, since the body is rotated rather than the antenna itself, even if multiple antennas are used, only one set is required to tilt the antennas, simplifying the structure. I can do it. Furthermore, since the configuration for tilting the antenna is provided between the trunk and the back surface of the main body, and is not provided inside the main body, manufacturing is facilitated. Furthermore, since the base portion 25 is in contact with the upper portion 4 of the main body portion 2 while the antenna is at a position of 90 degrees with respect to the bottom surface 8 of the lower portion 6, each antenna is prevented from tilting toward the main body portion 2 side. , the above 90° state can be maintained reliably.

Further, in both embodiments, the rod antenna 26 and the loop antennas 20, 22 are provided, but only one of them may be provided. In the first embodiment, the engagement grooves 36a to 36e were provided in the antenna mounting body 16, and the protrusion 34 was provided on the lower part 6 side of the main body 2.
A protrusion may be provided on the antenna mounting body portion 16 and an engagement groove may be provided on the lower portion 6 side of the main body portion 2. Further, in the second embodiment, the antenna mounting body 16 is provided with a protrusion 44, and the support disk 14 is provided with engagement holes 46a to 46d. A protrusion may be provided on the plate 14. Furthermore, although the main body part 2 is divided into two parts, an upper part and an upper part, it may be formed integrally, and the shape thereof does not have to be a rectangular parallelepiped.

[Brief explanation of drawings]

Figure 1 shows the first indoor antenna based on this invention.
2 is a plan view of the first embodiment, FIG. 3 is a bottom view of the first embodiment, and FIG. 4 is a right side view of the first embodiment. 5 is an enlarged cross-sectional view taken along the line AA in FIG. 3, and FIG. 6 is a partially omitted assembly view of the second embodiment. 2... Main body (support base), 8... Bottom surface of the lower part of the main body (bottom surface of support base), 16... Antenna mounting body, 20, 22... Loop antenna, 26
... Rod antenna, 38, 42 ... Step locking device.

Claims (1)

[Scope of utility model registration request] an antenna support base disposed with a bottom surface along a predetermined plane; an antenna mounting body supported on the back side of the antenna support base so as to be rotatable around a predetermined axis along the bottom surface of the antenna support base; ,
A plurality of antennas are installed on the circumferential surface of the antenna mounting body around the axis, and are mounted substantially on a straight line along the axis, and a plurality of antennas are provided between the antenna mounting body and the back side of the antenna support base. a step locking device for locking the rotation of the antenna mounting body; and a step locking device that locks the antenna in a state in which the antenna is in contact with the antenna support base in a state where the mounting position of each of the antennas in the antenna mounting body is perpendicular to the bottom surface. a tilt prevention part provided on the mounting body, and the step locking device is arranged in an arc drawn around the axis of rotation on the back side of the antenna support base and on one of the antenna mounting body. a plurality of first engaging parts provided at intervals along the antenna support base and the other of the antenna mounting body on the back side of the antenna support base and the other of the plurality of first engaging parts, respectively engageable with each other; The antenna is mounted by engaging one end of the plurality of first engaging portions along the arc in a state where the mounting position of each of the antennas in the antenna mounting body is perpendicular to the bottom surface. When the mounting position of each of the antennas on the body part is rotated by 90 degrees to the opposite side from the antenna support base, the first engaging part is in a position to engage with the other end of the plurality of first engaging parts. An indoor antenna comprising: 2 engaging parts.