JPS5841687B2 - chiensouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a delay device using a surface wave delay line.

In recent years, with the construction of many high-rise buildings, television interference has become a problem.

This is because radio waves from a transmitting station are reflected by high-rise buildings, etc., and appear as ghosts on the surface of a television receiver, degrading the image quality.

Various measures are being considered to reduce such ghosts, and one method is to reduce ghosts within a television receiver.

A block diagram of this example is shown in FIG. In FIG. 1, a signal containing a ghost comes in from antenna 1.

This signal passes through the tuner 2 and VIP circuit 3 and becomes an IF signal.

A part of this IF signal is sent to the synchronous detection circuit 4 at φ=00
The wave is detected by

This signal includes go and go. The IF signal is also delayed by a surface wave delay line 5 to approximately the same extent as the ghost delay time, and then enters a synchronous detection circuit 7 and a phase control circuit 8 via an amplifier 6.

The phase control circuit 8 adjusts the carrier wave to the phase difference between the main signal and the ghost signal, and uses its output as the carrier wave input of the synchronous detection circuit I.

The output of the synchronous detection circuit 7 is subjected to fine adjustment of the ghost delay time by the LC delay line 9, passes through the amplitude adjustment circuit 10, and is mixed with the output of the synchronous detection circuit 4 in the mixing circuit 11 to reduce ghosting. do.

In other words, this method produces a signal similar to the ghost using the surface wave delay line 5 or the amplitude adjustment circuit 10, and adds the signal with the opposite polarity to the ghost included in the main signal to reduce the ghost.

FIG. 2 shows the configuration of the surface wave delay line 5 in FIG. 1.

In FIG. 2, 12 is lithium niobate (LiNbO
a) Single crystal plate, 13 is input electrode, 14 is input ground,
15 is an output ground, and 16 to 18 are output electrodes.

As described above, since the surface wave delay line 5 is configured so that the delay time changes in a stepwise manner, when this is used in the ghost removal device shown in FIG. 1, the output electrodes 16 to 18
A possible method is to contact the surface wave delay line 5 in a sliding manner, but the surface wave delay line 5 needs to be protected from moisture and dust, and the electrode size is 0.3 mm x 0.7 mm, and the electrode pitch is 1.
．． It is very fine (75m77X), and it is not easy to directly slide and contact such electrodes, resulting in many contact failures and making it difficult to adjust the delay time.

Therefore, an object of the present invention is to provide a delay device that can prevent performance deterioration due to the surrounding atmosphere and facilitate adjustment operations.

FIG. 3 is a perspective view of one embodiment of the delay device of the present invention.

In the figure, the surface wave delay line 19 is sealed by a sealing body 20.

Each output electrode 21 of the surface wave delay line 19 is connected to a slide portion output terminal 22 formed on the surface of the sealed body 200 as shown.

This slide portion output terminal 22 has a large shape and pitch, and is brought into sliding contact with a slide contact piece 23.

As a result of this configuration, moisture and dust can be prevented and performance deterioration can be eliminated.

Further, since the output electrode 21 of the surface wave delay line 19 is not slid, it will not be damaged.

In addition, in terms of operation, the slide section output terminal 22 is stronger, has a larger area, and the pitch between the terminals can be wider, making it easier to use and adjusting the delay time (
Become.

As described above, according to the delay device of the present invention, a plurality of slide portion output terminals are arranged in parallel on the surface of the sealed body, and a plurality of output electrodes having different delay times of surface wave delay lines are connected to the plurality of output terminals. By connecting each and bringing the slide contact piece into sliding contact on the surface of the plurality of slide part output terminals,
It is possible to prevent the performance of the surface wave delay line from deteriorating due to the surrounding atmosphere, and the slide and deformation output terminals can be structured strongly, and the area is large, and the pitch between the terminals can be widened, making it easier to use. Adjustment operations also become easier.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the ghost removal device, and Fig. 2 is a block diagram of the ghost removal device.
FIG. 3 is a perspective view of an embodiment of the present invention. 19... Surface wave delay line, 20... Sealed body, 21... Output electrode, 22... Slide part output terminal, 23...・Slide contact piece.

Claims (1)

[Claims] 1. A surface wave delay line having a plurality of output electrodes having different delay times, a sealing body that seals the surface wave delay line, and a plurality of output electrodes of the surface wave delay line formed side by side on the surface of the sealing body, respectively. A delay device comprising a plurality of connected output terminals, and a delay time can be changed by sliding contact pieces on the surfaces of the plurality of output terminals.