Miniature patch type two-pole output adjustable resistor

Abstract

A miniature patch type two-pole output adjustable resistor is characterized in that an electric brush, a first electric conductor, a linear resistor body and a second electric conductor are arranged in a packaging shell, one end of the first electric conductor is electrically connected with one end of the second electric conductor through the linear resistor body, the electric brush comprises two conductive contacts, and the electric brush is in bridge connection with the linear resistor body and the electric conductors through the two conductive contacts; the electric conductor is a first electric conductor or a second electric conductor, the electric brush slides along the linear resistor body, the contact positions of the two conductive contacts of the electric brush and the resistor body and the electric conductor are changed, the other end of the first electric conductor is electrically connected with a first electrode, and the other end of the second electric conductor is electrically connected with a second electrode.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic devices, and particularly relates to a micro patch type two-pole output adjustable resistor. Background Art

[0002] With the continuous development of integrated circuit technology, electronic devices are gradually moving towards miniaturization and high precision. In many high-precision circuits, potentiometers (adjustable resistors) are indispensable components for achieving fine adjustment of resistance values. However, the existing potentiometer technology has obvious deficiencies in meeting the miniaturization requirements.

[0003] Traditional potentiometers usually adopt a rotary resistance adjustment method. Its resistance track is a circular structure, including two fixed resistance terminals and one adjustable resistance output terminal, with a total of three lead-out terminals. This design makes the appearance of the potentiometer mostly square or circular, and the minimum package size is still relatively large. For example, the minimum package of a common surface mount potentiometer is 3313 (3.2mm × 3.5mm), with a thickness of 2.2mm, and the size of the EVM3GSX50 potentiometer of Panasonic is 3mm × 3mm. These sizes cannot meet the requirements of modern circuits for smaller package sizes.

[0004] In addition, the structural design of existing potentiometers limits the possibility of further miniaturization. For example, the rotary resistance adjustment method requires a large space to accommodate the circular track, making it difficult for the potentiometer to achieve a rectangular and smaller size package, such as 0805 (2mm × 1.25mm), 1206 (3.2mm × 1.6mm), 1210 (3.2mm × 2.5mm), 1805 (4.5mm × 1.25mm), etc. However, these package sizes have been widely used in surface mount resistors, and there are currently no corresponding adjustable resistor products on the market.

[0005] There is a lack of an ultra-small package size adjustable resistor in the prior art that can meet the requirements of miniaturized circuits. Therefore, developing an adjustable resistor product with a simple structure and smaller size has become the key to solving this technical gap. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a micro patch type two-pole output adjustable resistor with a simple structure, small package size, and two output terminals.

[0007] The technical solution adopted to solve the above technical problems is: a miniature patch type two-pole output adjustable resistor, wherein a brush, a first conductor, a linear resistor, and a second conductor are arranged in a packaging shell, one end of the first conductor is electrically connected to one end of the second conductor through the linear resistor, the brush includes two conductive contacts, the brush bridges the linear resistor and the conductor through the two conductive contacts, the conductor is the first conductor or the second conductor, the brush slides along the linear resistor to change the contact position of the two conductive contacts of the brush with the resistor and the conductor, the other end of the first conductor is electrically connected to a first electrode, the other end of the second conductor is electrically connected to a second electrode, and the first electrode and the second electrode extend out of the packaging shell.

[0008] As a preferred technical solution, the resistance of the linear resistor is 50Ω~1MΩ.

[0009] As a preferred technical solution, the brush is in an inverted T shape, the vertical rod of the brush is an operating rod, the horizontal rod is a conductor, and the conductive contacts are provided at both ends of the bottom.

[0010] As a preferred technical solution, the first conductor and the second conductor are both L-shaped, the length of the horizontal limb of the first conductor is less than the length of the horizontal limb of the second conductor, the end of the horizontal limb of the first conductor is connected to the end of the horizontal limb of the second conductor through a linear resistor, and the brush bridges the linear resistor and the horizontal limb of the second conductor through two conductive contacts.

[0011] As a preferred technical solution, a ceramic body 4 is arranged between the longitudinal limb of the first conductor and the longitudinal limb of the second conductor, and the first electrode and the second electrode are stuck at the bottom of the ceramic body 4 .

[0012] The beneficial effects of the present invention are as follows:

[0013] The present invention realizes resistance adjustment only through two electrode outputs, which simplifies the structure and reduces the number of lead-out terminals compared to the traditional three-terminal design of potentiometers (two fixed resistance terminals and one adjustable resistance output terminal). It adopts a linear resistor and realizes resistance adjustment by horizontally sliding the brush, breaking through the space limitation of the traditional rotary resistance adjustment method, adapting to the requirements of smaller size packaging, and thus realizing the ultra-miniaturization of the adjustable resistor.

[0014] The present invention can achieve pad positions and sizes that are completely consistent with existing chip resistors (such as 0805, 1206, 1210, 1805 and other model package sizes), can directly replace traditional fixed resistors without modifying the circuit board design, lowers the threshold for use, and has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 is Figure 1 the top view of

[0017] Figure 3 is Figure 2 the A-A cross-sectional view of

[0018] Wherein: encapsulation case 1, relief groove 1-1, brush 2, second electrode 3, ceramic body 4, first electrode 5, resistor body 6, first conductor 7, second conductor 8. Specific embodiments

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0020] In Figure 1 , 2 , 3, for the micro patch type two-pole output adjustable resistor of this embodiment, a brush 2, a first conductor 7, a resistor body 6, and a second conductor 8 are installed in a rectangular encapsulation case 1. The brush 2 is in an inverted T shape. The vertical rod of the brush 2 is an operating rod, the horizontal rod is a conductor, and conductive contacts are processed at both bottom ends. A relief groove 1-1 is processed at the top of the rectangular encapsulation case 1. The operating rod of the brush 2 extends out of the relief groove 1-1. The end of the horizontal limb of the L-shaped first conductor 7 at the lower part of the brush 2 is connected to the end of the horizontal limb of the L-shaped second conductor 8 through a linear resistor body 6. The brush 2 is connected across the linear resistor body 6 and the conductor through two conductive contacts. The conductor is the first conductor 7 or the second conductor 8. In this embodiment, the brush 2 is connected across the linear resistor body 6 and the horizontal limb of the second conductor 8 through two conductive contacts. The brush 2 slides along the linear resistor body 6 to change the contact positions of the two conductive contacts of the brush 2 with the resistor body 6 and the second conductor 8. A ceramic body 4 is installed between the vertical limbs of the first conductor 7 and the second conductor 8. The ceramic body 4 is used to prevent current from flowing in an unnecessary path, ensure the electrical isolation between the brush 2 and the resistor body 6, avoid short circuit or leakage, and at the same time play a supporting role to ensure the mechanical stability of the whole structure. The end of the vertical limb of the first conductor 7 is electrically connected to a first electrode 5, and the end of the vertical limb of the second conductor 8 is electrically connected to a second electrode 3. The first electrode 5 and the second electrode 3 are stuck at the bottom of the ceramic body 4 and extend out of the encapsulation case to improve stability.

[0021] The resistance value of the resistor body 6 in this embodiment is 50Ω to 1MΩ.

[0022] The brush 2 slides along the linear resistor 6, changing the contact position between the two conductive contacts of the brush 2 and the resistor 6 and the second conductor 8. When the brush 2 moves in a certain direction, the effective length of the brush 2 in contact with the linear resistor 6 changes, thereby changing the resistance between the two electrodes. For example, when the brush 2 moves to the right end of the resistor 6, the effective length of the brush 2 in contact with the resistor 6 increases, and the resistance increases; conversely, when the brush 2 moves to the left end, the effective length decreases, and the resistance decreases. The current enters the resistor 6 from the first electrode 5, passes through the contact point between the brush 2 and the resistor 6, and then flows to the second conductor 8 through the brush 2, and finally flows out from the second electrode 3. The position of the brush 2 is adjusted by horizontally moving the brush 2 with an external tool, thereby adjusting the effective path length of the current passing through the resistor 6, thereby adjusting the resistance between the two electrodes.

Claims

1. A micro patch type adjustable resistor with two-pole output, characterized in that: A brush, a first conductor, a linear resistor, and a second conductor are arranged inside the encapsulation shell. One end of the first conductor is electrically connected to one end of the second conductor through the linear resistor. The brush includes two conductive contacts. The brush is bridged across the linear resistor and the conductor through the two conductive contacts. The conductor is the first conductor or the second conductor. The brush slides along the linear resistor to change the contact positions of the two conductive contacts of the brush with the resistor and the conductor. A first electrode is electrically connected to the other end of the first conductor, and a second electrode is electrically connected to the other end of the second conductor. The first electrode and the second electrode extend out of the encapsulation shell.

2. The micro patch type two-pole output adjustable resistor according to claim 1, characterized in that: The resistance value of the linear resistor is 50 Ω to 1 MΩ.

3. The micro patch type two-pole output adjustable resistor according to claim 1, characterized in that: The brush is in an inverted T shape. The vertical rod of the brush is the operating rod, the horizontal rod is the conductor, and the two conductive contacts are arranged at both bottom ends.

4. The micro patch type two-pole output adjustable resistor according to claim 1, wherein: Both the first conductor and the second conductor are in an L shape. The length of the horizontal limb of the first conductor < the length of the horizontal limb of the second conductor. The end of the horizontal limb of the first conductor is connected to the end of the horizontal limb of the second conductor through the linear resistor. The brush is bridged across the linear resistor and the horizontal limb of the second conductor through the two conductive contacts.

5. The micro patch type two-pole output adjustable resistor according to claim 4, characterized in that: A ceramic body is arranged between the vertical limbs of the first conductor and the second conductor. The first electrode and the second electrode are clamped at the bottom of the ceramic body.

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