Photoresistor

Abstract

The utility model provides a photosensitive resistor, which comprises a heat-conducting insulating seat, a base is arranged in the heat-conducting insulating seat, a photosensitive layer is arranged at the top of the base, two comb-shaped electrodes are arranged at the top of the photosensitive layer, metal pins are arranged on the comb-shaped electrodes, and the metal pins penetrate through the heat-conducting insulating seat and extend downwards. A metal bottom plate is arranged at the bottom of the heat-conducting insulating seat, a metal shell sleeving the outer side of the heat-conducting insulating seat is fixedly arranged at the top of the metal bottom plate, a light-transmitting plate corresponding to the comb-shaped electrode is arranged in the middle of the top of the metal shell, and cooling fins are arranged on the outer side of the metal shell in a circumferential array mode; according to the utility model, the base, the photosensitive layer and the comb-shaped electrode are in close contact with the inner side of the heat-conducting insulating seat, the heat-conducting insulating seat can transfer internal heat to the external metal shell and the metal pins, the heat is favorably transferred outwards, and the radiating fins are arranged on the outer side of the metal shell, so that the radiating area is increased, and the radiating effect is ensured; and the stability of the photoresistor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of resistors, and in particular relates to a photoresistor. Background Art

[0002] The temperature characteristic of a photoresistor refers to the effect of temperature on the resistance, sensitivity or photocurrent of a photoresistor under certain light conditions. As the temperature rises, both the dark resistance and sensitivity decrease. Obviously, the smaller the temperature coefficient of a photoresistor, the better, but the temperature coefficients of photoresistors made of different materials are different. Therefore, when using a photoresistor, you should consider taking cooling measures to improve the temperature coefficient of the photoresistor.

[0003] In the prior art, photoresistors are usually encapsulated inside a shell. For example, a Chinese utility model patent document with authorization announcement number CN215418190U discloses a highly sensitive photoresistor with a relatively closed internal space. Components such as a photosensitive structure are encapsulated inside the shell. The closed internal space of the shell is not conducive to the transfer of heat to the outside, which affects the accuracy of the photoresistor.

[0004] Therefore, it is necessary to design a photoresistor that is conducive to heat transfer to the outside and improves operating stability to solve the current technical problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides a photoresistor which is conducive to the outward transfer of heat and improves the operating stability.

[0006] The technical solution of the utility model is: a photoresistor, comprising a thermally conductive insulating seat, the interior of the thermally conductive insulating seat is provided with a base, the top of the base is provided with a photosensitive layer, the top of the photosensitive layer is provided with two comb-shaped electrodes, the comb-shaped electrodes are provided with metal pins, the metal pins penetrate the thermally conductive insulating seat and extend downward, the bottom of the thermally conductive insulating seat is provided with a metal bottom plate, the top of the metal bottom plate is fixedly provided with a metal shell mounted on the outside of the thermally conductive insulating seat, the top of the metal shell is centrally provided with a light-transmitting plate corresponding to the comb-shaped electrodes, and the outside of the metal shell is provided with heat dissipation fins in a circular array.

[0007] The top of the thermally conductive insulating seat is provided with a mounting groove, the base, the photosensitive layer and the comb-shaped electrode are sequentially arranged inside the mounting groove, and the bottom of the thermally conductive insulating seat is provided with a pin channel matching the metal pin.

[0008] A convex ring is fixedly arranged on the bottom of the heat-conducting insulating seat concentrically with the pin hole, and an avoidance hole matching the convex ring is opened on the metal bottom plate.

[0009] The heat-conducting insulating seat is a barrel-shaped structure made of alumina ceramics.

[0010] A sealing ring is arranged between the top of the heat-conducting insulating seat and the light-transmitting plate.

[0011] A step groove is arranged on the top of the heat-conducting insulating seat, and the sealing ring is arranged inside the step groove.

[0012] The light-transmitting plate is a circular glass plate.

[0013] Beneficial effects of the utility model:

[0014] In the utility model, the base, the photosensitive layer and the comb-shaped electrode are in close contact with the inner side of the thermally conductive insulating seat. The thermally conductive insulating seat can transfer the heat inside it to the external metal shell and metal pins, which is beneficial to the heat transfer to the outside. The outer side of the metal shell is provided with heat dissipation fins to increase the heat dissipation area, ensure the heat dissipation effect, and improve the stability of the photoresistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is one of the structural schematic diagrams of the photoresistor in the utility model.

[0016] Figure 2 This is the second structural schematic diagram of the photoresistor in the utility model. DETAILED DESCRIPTION

[0017] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0018] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] like Figure 1 and 2As shown, the photoresistor includes a thermally conductive insulating seat 1, the interior of the thermally conductive insulating seat 1 is provided with a base 2, the top of the base 2 is provided with a photosensitive layer 3, the top of the photosensitive layer 3 is provided with two comb-shaped electrodes 4, the comb-shaped electrodes 4 are provided with metal pins 5, the metal pins 5 penetrate the thermally conductive insulating seat 1 and extend downward, the bottom of the thermally conductive insulating seat 1 is provided with a metal bottom plate 6, the top of the metal bottom plate 6 is fixedly provided with a metal shell 7 sleeved on the outside of the thermally conductive insulating seat 1, the top of the metal shell 7 is centrally provided with a light-transmitting plate 8 corresponding to the comb-shaped electrodes 4, and the outside of the metal shell 7 is provided with heat dissipation fins 71 in a circumferential array; in this embodiment, the base 2, the photosensitive layer 3 and the comb-shaped electrodes 4 are in close contact with the inner side of the thermally conductive insulating seat 1, the thermally conductive insulating seat 1 can transfer the heat inside it to the external metal shell 7 and the metal pins 5, which is conducive to the heat transfer to the outside, and the heat dissipation fins 71 are provided on the outside of the metal shell 7 to increase the heat dissipation area, ensure the heat dissipation effect, and improve the stability of the photoresistor.

[0020] In some embodiments, the top of the thermally conductive insulating seat 1 has a mounting groove 11, and the interior of the mounting groove 11 provides space for the arrangement of the base 2, the photosensitive layer 3 and the comb-shaped electrode 4. The base 2, the photosensitive layer 3 and the comb-shaped electrode 4 are sequentially arranged inside the mounting groove 11, and the outer sides of the base 2, the photosensitive layer 3 and the comb-shaped electrode 4 are tightly abutted against the interior of the mounting groove 11, which is beneficial to heat transfer. The thermally conductive insulating seat 1 has good insulation properties and can form insulation isolation between the metal shell 7 and the internal photosensitive layer 3 and the comb-shaped electrode 4. The bottom of the thermally conductive insulating seat 1 is provided with a pin channel 12 matching the metal pin 5.

[0021] In some embodiments, a convex ring 13 is fixedly arranged concentrically with the pin hole 12 at the bottom of the thermally conductive insulating seat 1, and an avoidance hole 6 matching the convex ring 13 is opened on the metal base plate 6. In order to avoid a short circuit caused by the metal pin 5 contacting the metal base plate 6 when it shakes during welding, a convex ring 13 is arranged at the bottom of the pin hole 12 and is sleeved on the outside of the metal pin 5, so as to form an insulating isolation between the metal pin 5 and the metal base plate 6, so as to avoid a short circuit caused by the metal pin 5 contacting the metal base plate 6 when it shakes.

[0022] In some embodiments, the thermally conductive insulating seat 1 is a cylindrical structure made of alumina ceramics. Alumina ceramics have good thermal conductivity, which is beneficial to heat transfer, and also have good electrical insulation properties.

[0023] In some embodiments, a sealing ring 9 is provided between the top of the thermally conductive insulating seat 1 and the light-transmitting plate 8. After the metal shell 7 and the metal bottom plate 6 are fixedly connected, the inwardly turned edge 72 at the top of the metal shell 7 presses down the light-transmitting plate 8, and the bottom of the light-transmitting plate 8 and the top of the thermally conductive insulating seat 1 squeeze the upper and lower sides of the sealing ring 9 respectively. After the sealing ring 9 is deformed, it abuts against the inner wall of the mounting groove 11, thereby improving the sealing between the light-transmitting plate 8 and the thermally conductive insulating seat 1, and preventing moisture from entering the interior of the metal shell 7 during use and affecting the accuracy of the photoresistor.

[0024] In some embodiments, a step groove 14 is disposed on the top of the thermally conductive insulating seat 1 , and a sealing ring 9 is disposed inside the step groove 14 , wherein the sealing ring 9 is an O-ring.

[0025] In some embodiments, the light-transmitting plate 8 is a circular glass plate.

[0026] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0027] The above-mentioned embodiments only express some implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A photoresistor, characterized in that: It includes a thermally conductive insulating seat, a base is arranged inside the thermally conductive insulating seat, a photosensitive layer is arranged on the top of the base, two comb-shaped electrodes are arranged on the top of the photosensitive layer, metal pins are arranged on the comb-shaped electrodes, the metal pins penetrate the thermally conductive insulating seat and extend downward, a metal bottom plate is arranged at the bottom of the thermally conductive insulating seat, a metal shell is fixedly arranged on the top of the metal bottom plate and is sleeved on the outside of the thermally conductive insulating seat, a light-transmitting plate corresponding to the comb-shaped electrodes is arranged in the center of the top of the metal shell, and heat dissipation fins are arranged in a circular array on the outside of the metal shell.

2. The photoresistor according to claim 1, characterized in that: The top of the thermally conductive insulating seat is provided with a mounting groove, the base, the photosensitive layer and the comb-shaped electrode are sequentially arranged inside the mounting groove, and the bottom of the thermally conductive insulating seat is provided with a pin channel matching the metal pin.

3. The photoresistor according to claim 2, characterized in that: A convex ring is fixedly arranged on the bottom of the heat-conducting insulating seat concentrically with the pin hole, and an avoidance hole matching the convex ring is opened on the metal bottom plate.

4. The photoresistor according to claim 2, characterized in that: The heat-conducting insulating seat is a barrel-shaped structure made of alumina ceramics.

5. The photoresistor according to claim 1, characterized in that: A sealing ring is arranged between the top of the heat-conducting insulating seat and the light-transmitting plate.

6. The photoresistor according to claim 5, characterized in that: A step groove is arranged on the top of the heat-conducting insulating seat, and the sealing ring is arranged inside the step groove.

7. The photoresistor according to claim 1, characterized in that: The light-transmitting plate is a circular glass plate.

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