JPS6025156Y2 - Thermistor mounting structure of temperature automatic gain adjustable amplifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermistor mounting structure of a temperature automatic gain adjustment type amplifier that adjusts the gain of the amplifier in response to changes in external temperature.

For example, submarine cables installed in relatively shallow seabeds experience fluctuations in attenuation due to changes in seawater temperature.

For this reason, submarine repeaters use temperature-controlled gain amplifiers.

This type of repeater connects a thermistor as a temperature sensing element to the feedback circuit of the amplifier built into the repeater, and can automatically change the gain depending on the repeater's environmental temperature and adjust the attenuation fluctuations of the cable. It looks like this.

The present invention relates to a structure for mounting a thermistor used in such a temperature-controlled gain amplifier.

FIG. 1 shows an example of the structure of a conventional amplifier. Reference numeral 1' indicates a cover 2 which is a housing of an amplifier, and 3 and 3' which indicate a printed wiring board (hereinafter abbreviated as a wiring board) forming a circuit of the amplifier.

Reference numeral 4 denotes a thermistor as a temperature sensing element, which has the same number as the capacitor coil and other parts, and is arranged on the wiring boards 3 and 3'.

In such a conventional structure, when the external temperature fluctuates, heat is transferred through the amplifier housing and through the gas inside the amplifier, which takes a very long time. ).

In particular, when installed in a thick, welded and sealed pressure case like a submarine repeater, it takes several hours or more for the temperature to stabilize, and therefore, during the manufacturing process, the trench width transducer or repeater must be completely dismantled. Characteristic tests take a lot of time, and if the seawater temperature differs between night and day, there will be a time difference in gain adjustment in response to changes in repeater gain due to cable attenuation fluctuations. have.

In order to eliminate the above-mentioned drawbacks, the present invention provides a temperature automatic gain adjustment type amplifier used in electronic equipment, which includes a thermistor compensation resistor, a thermistor, a wiring board on which the compensation resistor and thermistor are mounted, and a mounting base. At the same time, the thermistor is installed in contact with a hole provided in the mounting base that engages with the thermistor, and the block is installed by bringing the mounting base into close contact with the side surface of the amplifier case. is characterized in that a through hole is provided in the side surface of the amplifier housing to match the position where the thermistor is mounted.

The present invention will be described in detail below with reference to the drawings.

Figure 2 shows the thermistor circuit. Thermistors vary widely in quality, and a compensating resistor (R□) is usually added to the thermistor (TE).

R2) is used in combination.

In this case, the resistance value of the resistor (R1°R2) is selected depending on the individual characteristics of the thermistor.

In the conventional structure, the main components, the thermistor, and its compensating resistor are mounted on the same wiring board, so when mass-produced, selecting and installing different resistors for each thermistor is complicated in terms of product management.

The present invention is characterized in that the thermistor circuit network shown in FIG. 2 is constructed from one block shown in FIG. 3, and the block is attached to the side surface of the amplifier housing as shown in FIG. 4.

FIG. 3 shows a perspective view of an example in which the thermistor circuit network is constructed from one block.

In Fig. 3, 11 is the thermistor (TH) in Fig. 2.
) and compensation resistors (R□, R2).

Reference numeral 12 denotes a mounting base, which is provided with screw holes 14 and 14' for mounting on the amplifier housing.

Also, the mounting base 12 has a hole 15 that engages with the thermistor 13.
The structure of the present invention is obtained by installing the thermistor 1341 on the mounting base and connecting it to the wiring board 11 with the lead wire of the thermistor.

The thermistor circuit block shown in FIG. 3 is attached to the amplifier housing as shown in FIG.

FIG. 4 shows an embodiment of the interior of the amplifier with the cover removed, with the main components of the amplifier mounted on a wiring board 43, while the thermistor network described above is housed in block 41.

A groove 44 is provided in the amplifier housing 42, and the block 41 is screwed in with the screw 2.
2.22' allows for closer installation.

Further, a hole 21 passing through the housing 42 is provided so that the temperature of the case of the thermistor 13 can be directly measured.

According to the present invention, as mentioned above, by separating the thermistor circuit network from the main circuit section of the amplifier, the main circuit section can be manufactured with exactly the same component configuration, which is advantageous in terms of product control. In this case, heat is transferred from the amplifier housing 42 to the thermistor 13 via the block 41 through a path that conducts heat to the internal thermistor, so that the path is shortened, and therefore the heat transfer time can be shortened.

Furthermore, by providing the hole 21 penetrating the amplifier housing 42, the temperature of the thermistor case can be measured without removing the cover of the amplifier, etc., making the structure advantageous for measuring the characteristics of the amplifier.

Although the present invention has been described as an example of application to a printed wiring board, it can also be applied to other types (for example, thin film substrates).

[Brief explanation of the drawing]

Figure 1 shows an example of the structure of conventional thermistor mounting;
3 shows an embodiment of the thermistor circuit block according to the present invention, and FIG. 4 shows an embodiment of the present invention in which the thermistor circuit block is attached to an amplifier housing. In FIG. 4, 41 is a thermistor circuit block;
2 is an amplifier housing, 13 is a thermistor, and 21 is a through hole.

Claims (1)

[Scope of utility model registration request] In a temperature automatic gain adjustable amplifier used in electronic equipment, a block is composed of a thermistor compensation resistor, a thermistor, a wiring board on which the compensation resistor and thermistor are mounted, and a mounting base, and the thermistor is mounted on the mounting base. The block is installed in contact with the provided hole that mates with the thermistor, the mounting base is brought into close contact with the side of the amplifier housing, and the block is attached, and the through hole is placed on the side of the amplifier housing at the position where the thermistor is mounted. The thermistor mounting structure of the temperature automatic gain adjustable amplifier is characterized by matching.