CN109945978A - an autofocus structure - Google Patents

Abstract

The present invention relates to a kind of automatic focusing structures, the second cylinder including being provided with the first cylinder of infrared detector and with the relative movement of the first cylinder, second cylinder is provided with infrared lens, by driving device first cylinder and the second cylinder are relatively moved, to obtain the effect focused automatically, furthermore, by one of infrared detector and Acquisition Circuit or it is completely provided with heat sink, pass through the reasonable setting to the biggish circuit position of calorific value, to reduce influence of the biggish circuit of calorific value to infrared detector, improve the performance and temperature measurement accuracy of thermal imaging system.

Description

an autofocus structure

technical field

The invention relates to an automatic focusing structure of an infrared thermal imager.

Background technique

In the prior art, the infrared thermal imager generally uses a motorized focusing mechanism that drives the lens to complete focusing. For example, through the traditional structure, it is necessary to replace the lens or superimpose the lens, which will lead to the high cost of replacing the motorized lens, or the superimposed lens. However, when the number of lenses increases, the infrared light is attenuated greatly, and the image is deteriorated. In addition, the hardware circuit of the existing thermal imager is generally divided into an infrared thermal imaging detector circuit part and a processing circuit part; the processing circuit part, such as image processing, generally generates a large amount of heat. Since the thermal imaging camera is very sensitive to heat, the heat generated by the processing circuit part during the working process will affect the accuracy of the thermal imaging detector. How to perform automatic focusing and how to reduce the heat generated by the processing circuit to affect the infrared thermal imaging detector as much as possible while solving the automatic focusing, so as to improve the performance and temperature measurement accuracy of the thermal imager, are the problems that need to be solved.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention proposes an automatic focusing structure of an infrared thermal imager.

In order to solve the above-mentioned technical problems, the technical scheme of the present invention is as follows:

An automatic focusing structure includes a first cylinder body provided with an infrared detector and a second cylinder body that moves relatively with the first cylinder body, the second cylinder body is provided with an infrared lens, and a driving device makes the first cylinder body The cylinder body and the second cylinder body move relatively.

Further, the outer wall of the first cylinder is nested with the inner wall of the second cylinder, and the parts in contact with each other are made of materials with good thermal conductivity.

Further, the infrared detection circuit includes an infrared detector and a collection circuit, one or all of the infrared detector or the collection circuit is provided with a heat dissipation plate, and the heat dissipation plate is in contact with the first cylinder.

Further, the infrared detector is provided with a heat sink, the acquisition circuit is provided on the rear wall of the first cylinder, the infrared detector and the acquisition circuit are connected in a plug-in manner, and the plug-in circuit is provided in the acquisition circuit. , the connecting wire of the infrared detector passes through the heat sink and is plugged into the plug-in circuit of the acquisition circuit.

Further, the acquisition circuit includes an infrared detector connection circuit and an analog-to-digital conversion circuit, the infrared detector connection circuit and the analog-to-digital conversion circuit are connected by wires or flexible cables, and the infrared detector connection circuit is arranged in the first cylinder. , the analog-to-digital conversion circuit is arranged outside the first cylinder or the second cylinder.

Further, the driving device includes a motor and a motor drive shaft, the motor is fixed inside the infrared thermal imager, and the motor drive shaft drives the first cylinder after passing through the second cylinder.

Further, the motor may be disposed at the second cylinder or a bracket disposed inside the thermal imager, a partition plate disposed inside the thermal imager, or a bracket disposed in the second cylinder.

Further, the driving device includes a motor and a motor drive shaft, the motor is fixed inside the infrared thermal imager, and the motor drive shaft drives the second cylinder.

Further, the motor may be disposed at the first cylinder or a bracket disposed on the first cylinder.

Further, the motor is wrapped with a metal casing.

The beneficial effect of the present invention is that: through the first cylinder provided with the infrared detector and the second cylinder provided with the infrared lens, the first cylinder and the second cylinder move relative to each other, so as to obtain the effect of automatic focusing, and in addition , one or both of the infrared detector and the acquisition circuit are provided with a heat sink, and through the reasonable setting of the position of the circuit with a large amount of heat, the influence of the circuit with a large amount of heat on the infrared detector is reduced, and the performance of the thermal imager is improved. performance and temperature measurement accuracy.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the schematic diagram of another kind of structure of the present invention;

Figure 3 is a cross-sectional view of the structure of the handheld thermal imager;

Fig. 4 is an enlarged view of the autofocus structure in Fig. 3;

Figure 5 is a cross-sectional view of the structure of a handheld thermal imager with a compartment;

Figure 6 is a cross-sectional view of the structure of a handheld thermal imager with a compartment and a heat sink;

Fig. 7 is another structural cross-sectional view of the hand-held thermal imager with a compartment and a heat-dissipating device;

Figure 8 is a cross-sectional view of the structure of a handheld thermal imager with a compartment;

FIG. 9 is a cross-sectional view of another structure of a handheld thermal imager with a compartment and a heat sink.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Example 1:

As shown in FIG. 1 , a casing of an automatic focusing structure of an infrared thermal imager includes: a front casing 9 , a body casing 10 and a display frame 17 , an infrared lens 8 is arranged at the front end of the infrared thermal imager, and a display screen 15 It is arranged at the display frame 17 , and a handle 18 is also arranged on the body shell 10 . Inside the shell of the infrared thermal imager, an auto-focusing structure is provided, including a first cylinder 1, which is provided with an infrared detector 3; a second cylinder 2, which is provided with an infrared lens 8, which is fixed in relative position Connect; the first cylinder 1 and the second cylinder 2 are moved relative to each other through the driving device. The first cylindrical body 1 and the second cylindrical body 2 are in the shape of mutual cooperation. For example, the first cylindrical body 1 and the second cylindrical body 2 are all cylindrical, oval, square and other shapes. The first cylindrical body 1 and the second cylinder 2 respectively have a rear wall of metal material, the rear wall and the cylinder can be fully or partially closed, and the rear wall can adopt various shapes, and in some embodiments, the rear wall can also be removed. .

The first cylinder 1 can slide on the second cylinder 2, and the two are nested in each other. For example, in this example, the first cylinder 1 is nested in the second cylinder 2, and the outer wall of the first cylinder 1 is The inner wall of the second cylinder 2 forms a nesting structure. The first cylinder 1 and the second cylinder 2 conduct good heat with each other. Part or all of the contact parts can be made of metal materials with good heat conduction. The outer wall of the first cylinder 1 and the The inner wall of the second cylindrical body 2 ensures a gap that can not only move smoothly, but also take into account good heat dissipation. The nesting structure may be partial or complete nesting, and the cylinder walls of the first cylinder 1 and the second cylinder 2 may have openings. Preferably, the cylinder walls of the first cylinder 1 and the second cylinder 2 are closed, and the first cylinder 1 is arranged inside the second cylinder 2 to facilitate heat dissipation and heat conduction. In addition, the first cylinder body 1 and the second cylinder body 2 are only for the convenience of description and do not constitute a limitation on the cylinder bodies. The first cylinder body 1 may also be called an inner cylinder, and the second cylinder body 2 may be called an outer cylinder. .

The first cylinder body 1 is generally equipped with an infrared detection circuit. According to different applications and the performance of the detector, the first cylinder body 1 is provided with at least an infrared detector 3 of an infrared detection circuit. Corresponding to the infrared detector 3, the first cylinder body 1 is configured with its connection structure, and the first cylinder body 1 has an opening conforming to the imaging of the infrared detector 3 to receive the light of the infrared lens 8; the infrared detector 3 is equipped with a heat dissipation plate 6 For its heat dissipation, the heat dissipation plate 6 is made of a material with good thermal conductivity, such as a metal material, which can be connected to the inner wall of the first cylinder 1 ; In order to reduce the interference of the stray light to the infrared detector 3 , the first cylinder 1 and the heat dissipation plate 6 constitute a closed space of the infrared detector 3 .

The infrared detection circuit generally includes an infrared detector 3 and an acquisition circuit 4; the acquisition circuit 4 is configured with, for example, a signal acquisition and analog-to-digital conversion circuit, which is used to convert the analog signal output by the infrared detector 3 to analog-to-digital conversion, and then output the thermal image. AD value data. The collection circuit is provided with a heat dissipation plate 5 , which is made of a material with good thermal conductivity, such as a metal material, and can be connected to the inner wall of the first cylinder 1 so as to conduct heat to the first cylinder 1 . The heat dissipation plate 6 for heat dissipation of the infrared detector 3 and the heat dissipation plate 5 for heat dissipation of the collecting circuit can be adjusted and adapted in shape and position.

The connection mode between the acquisition circuit 4 and the infrared detector 3 can be configured in various ways. For example, it can be connected in a fixed manner. For example, the infrared detector 3 can be welded or plugged into the acquisition circuit 3 through a socket. At this time, the welding or socket contact is the infrared detector connection circuit. It can also be an active connection, such as connecting the pins of the infrared detector 3 and the acquisition circuit 3 through a flexible wire or an FPC flexible circuit. It can also be partly fixed connection and partly movable connection, for example, part is connected by flexible wire or FPC flexible circuit, and part is welded on acquisition circuit 3 .

In other embodiments, the infrared detection circuit can also only include the infrared detector 3, and the infrared detector 3 has an analog-to-digital conversion circuit inside, and directly outputs the signal of the infrared detector 3 through the pin interface, such as the AD of the thermal image. value data. In other embodiments, the infrared detection circuit can also have the function of part or all of the processing circuit; for example, one of the AD value data for outputting the thermal image, and the data for displaying, recording, etc. after the thermal image processing is output. or multiple at the same time. In another example, the acquisition circuit 4 can be configured as an image processing circuit with thermal image data or its function, such as converting it into data for display, recording, etc., and outputting it.

The infrared detector 3 can be plugged on a socket for fixed connection, and the socket is welded on the acquisition circuit 4 . In another example, the acquisition circuit 4 with the socket is assembled on the outside of the rear wall of the first cylinder 1, the rear wall has an opening through the socket, and the pin 7 of the infrared detector 3 is connected to the acquisition circuit 4 through the socket; At this time, the rear wall can also serve as a heat dissipation plate of the infrared detector 3 , and a heat insulating material layer can be provided between the rear wall and the acquisition circuit 4 , so that the heat of the acquisition circuit 4 is not easily conducted to the infrared detector 3 .

The acquisition circuit 3 can be partially or fully assembled inside the first cylinder 1, outside the first cylinder 1, inside the second cylinder 2, and outside the second cylinder 2; in some cases, the acquisition circuit 3 can be divided into The second part is the part where the infrared detector 3 is welded, namely the infrared detector connection circuit and the part equipped with the analog-to-digital conversion circuit. The two are connected by wires or flexible cables such as FPC flexible circuits. For example, the analog-to-digital conversion circuit does not generate much heat. , the collection circuit 3 can be all configured in the first cylinder 1 .

In one embodiment, as shown in FIG. 3, the infrared detector 3 is plugged into the acquisition circuit part through the socket, the infrared detector 3 and the socket circuit of the acquisition circuit are arranged in the first cylinder 1, and the analog-to-digital conversion of the acquisition circuit is performed. The processing circuit part, which generates a large amount of heat, can be arranged outside the first cylinder 1 or the second cylinder 2 , and the socket circuit and the analog-to-digital conversion circuit are connected by wires or flexible cables 19 .

In another embodiment, the acquisition circuit 4 can be divided into two parts, the part where the infrared detector 3 is welded, and the part where the analog-to-digital conversion circuit is configured, and the two are connected by the FPC flexible circuit, and the latter is configured on the second cylinder 2 outside;

When a wire or a flexible circuit is used, on the one hand, the weight inside the first cylinder 1 can be reduced to facilitate the dragging of the stepping motor 14 , and on the other hand, the influence of the heating of the acquisition circuit 4 on the infrared detector 3 can be reduced. When a wire or a flexible circuit is used to connect and need to pass through the first cylinder 1 or the second cylinder 2, according to different designs, corresponding positions of the first cylinder 1 and the second cylinder 2 are left with corresponding transfer ports and FPC connections inside and out, or leave openings through the FPC flex circuit.

Generally, it is considered that the part of the acquisition circuit 4 that generates less heat and is easy to design and implement is connected with the infrared detector 3 ;

Referring to Figures 5 to 7, the acquisition circuit 4 is divided into a part of the acquisition circuit that is fixedly connected to the infrared detector 3, and a part of the acquisition circuit that is relatively movable with the infrared detector 3; part of the acquisition circuit generates a large amount of heat and is configured. In the cavity formed by the second partition plate 27 and the rear casing, preferably, the second partition plate 27 is also used as heat dissipation; as shown in FIG. The circuit 4 passes through the openings of the first cylinder 1 and the second cylinder 2 through a flexible cable or FPC, and is connected to the adapter socket 32; the adapter socket 32 and part of the acquisition circuit 31 pass through the cable 30 arranged in the wire slot to connect. The opening of the second cylinder 2 is slightly larger than the opening of the first cylinder 1 , and the opening of the second cylinder 2 depends on the movement stroke of the first cylinder 1 in the second cylinder 2 .

As shown in FIG. 4, the enlarged schematic diagram of the first cylinder 1 and the second cylinder 2; the acquisition circuit 13 is divided into a part of the acquisition circuit that is fixedly connected to the infrared detector 3 and a part of the acquisition circuit that is movably connected to the infrared detector 3. Part of the acquisition circuit is arranged on the outer wall of the second cylinder 2; part of the acquisition circuit passes through the openings of the first cylinder 1 and the second cylinder 2 through flexible cables or FPC, and is connected to the part of the acquisition circuit 31. Since the part of the cord located in the first cylinder body 1 does not need to be obtained, the opening of the first cylinder body 1 is closed with glue after the flexible cord is assembled, and the soft cord outside the first cylinder body 1 and inside the second cylinder body 2 is closed with glue. The length of the wire depends on the movement stroke of the first cylinder 1 in the second cylinder 2, with a certain margin. The part of the acquisition circuit that is movably connected to the position of the infrared detector 3 may be the analog-to-digital conversion circuit 31 .

The second barrel 2 is provided with an infrared lens, which is arranged in a fixed relative position; there may be various implementations between the infrared lens and the second barrel 2. In FIG. 1 , the front end of the second barrel 2 is connected to the The front casing 9 is fixedly connected, and the infrared lens 8 can be assembled to the front casing 9 ; in other examples, as shown in FIG. 2 , the infrared lens 8 can be directly assembled to the front end of the second cylinder 2 . The way of assembling can be realized by various ways such as thread, bayonet, screw fixing and so on. The second cylinder 2 and the front case 9 are made of materials with good thermal conductivity, such as metal materials; in order to better dissipate heat from the outside of the front case 9, there are heat dissipation grooves.

Preferably, the infrared lens 8 is connected to the front housing 9 or the front end of the second cylinder 2 in a snap-fit manner, so that it is convenient to replace different lenses; the focusing structure passes the relative movement of the first cylinder 1 and the second cylinder 2 To achieve, that is, the lens does not move, and the distance between the detector and the lens is changed by driving the first cylinder 1 with the infrared detector to achieve focus adjustment; it is convenient to replace different lenses.

It is located on the optical path of the infrared detector 3 receiving the infrared lens 8, and is also equipped with a thermal image calibration clip, which can be arranged at the infrared lens 8, the opening of the first cylinder 1, the second cylinder 2 and other positions. . Preferably, the opening of the first cylinder body 1 is provided with a thermal image calibration baffle, which is located between the opening of the first cylinder body 1 and the infrared lens 8 after assembly.

In order to ensure good heat dissipation of the infrared detector 3, the front part of the second cylinder 2 can be in good contact with the metal structure of the infrared lens 8 or its metal connector, so that the heat of the infrared detector 3 can escape from the first cylinder. 1 to the second barrel 2 to the infrared lens 8 for transmission, or the front of the second barrel 2 can be in good contact with the metal structure of the front housing 9 or its metal heat sink,

The advantages of the above structure are that the first cylinder body 1 and the second cylinder body 2 play a stable role, and have the advantages of heat dissipation, electromagnetic interference, simple processing, and stable operation.

A driving device, which is configured to be set in a fixed relative position with one of the cylinders, and set in a relative position with the other cylinder; generally, the relative position of the driving device and the second cylinder is fixed. set, and set with the first cylinder in a manner of relative position movement. The driving device can adopt various electric motors, pneumatic and magnetic driving devices, preferably, a stepping motor structure is adopted. In the solution of the present application, the driving device may include a stepping motor 14, a motor drive shaft 13 such as a screw, a bearing or a nut matched with the motor drive shaft 13; in other examples, a speed change mechanism may also be included.

As shown in FIG. 1 , the infrared thermal imager is internally equipped with a partition 11 , the stepping motor 14 is fixed on the partition 11 , and the relative position of the stepping motor 14 and the second cylinder 2 is fixed; the bearing matched with the motor drive shaft 13 (not shown) is fixed to the rear wall 15 of the first cylinder 1 ; the motor drive shaft 13 passes through the rear wall of the second cylinder 2 and is connected to the rear wall of the first cylinder 1 . The stepper motor 14 is controlled by the control device (not shown), and the stepper motor 14 is driven by the motor drive shaft 13 to make the first cylinder 1 move axially in the second cylinder 2, such as forward or backward, thereby changing the The distance between the infrared detector 3 and the infrared lens 8, so as to achieve automatic focusing.

There can be various implementations for setting the driving device; for example, the relative position of the stepper motor 14 and the second cylinder 2 is fixedly connected, the stepper motor 14 can be fixed inside or outside the rear wall of the second cylinder 2, or it can be It is a bracket structure assembled inside or outside the second cylinder 2; it can also be arranged on a structure with a fixed relative position to the second cylinder 2, such as the partition 11 in FIG. 1 .

The nut or bearing matched with the motor drive shaft 13 can be mounted on the inner or outer structure of the first cylinder 1 fixedly connected, such as the first cylinder 1 Bearings connected to the motor drive shaft 13 are arranged on the rear wall, the cooling fins 5 inside the first cylindrical body 1, and, for example, on the circuit board of the first cylindrical body 1, so that a more compact volume can be obtained.

As shown in FIGS. 3 to 9 , the second cylinder 2 is equipped with a bracket 24 , and the stepping motor 14 is fixed on the bracket 24 , so that the relative position of the stepping motor 14 and the second cylinder 2 is fixed; The bearing is fixed to the rear wall 20 of the first cylindrical body 1 .

The bracket 24 preferably adopts a board with good heat insulation performance, so that the interior of the infrared thermal imager is divided into two cavities to ensure that the heat of the processing circuit is conducted to the area of the second cylinder 2 as little as possible; The space occupied by the input motor 14 and the acquisition circuit is occupied. As shown in FIG. 1 , part of the acquisition circuit 12 has an opening space corresponding to the position of the stepper motor 14, so that the stepper motor 14 can pass through part of the acquisition circuit; in other examples, Part of the acquisition circuit 31 can also be divided into multiple circuit boards

Because the first cylinder 1 and the second cylinder 2 form a nested structure that cooperates with each other, the first cylinder 1 can move in the second cylinder 2, and the first cylinder 1 is connected with the motor drive shaft 13, which is based on the steps The motor driven by the motor 14 drives the shaft 13 to move; the contact surface between the first cylinder 1 and the second cylinder 2 is stable, so stable and reliable driving can be achieved.

The motor drive shaft 3 is located on the center line of the first cylinder 1. If the first cylinder 1 is circular, it is better that the motor drive shaft 3 is located on the axis of the first cylinder 1; when the stepping motor 14 is also equipped with a speed change device , the motor drive shaft 13 can be a drive shaft of a speed change device such as a screw rod.

In order to reduce the interference of the stepping motor 14 to the circuit, preferably, the stepping motor 14 is wrapped with a metal casing for electromagnetic shielding.

In other examples, the relative position of the stepper motor 14 and the first cylinder 1 can also be fixedly connected, for example, the stepper motor 14 can be fixed inside or outside the rear wall of the first cylinder 1, or it can be arranged in The bracket structure inside or outside the first cylinder 1 can also be arranged on a structure whose relative position to the first cylinder 1 is fixed. At this time, the stepper motor 14 and the second cylinder body 2 are set in a relatively movable manner, and the nut or bearing matched with the motor drive shaft 13 can be assembled to the inner or outer structure of the second cylinder body 2, such as the first The rear wall of the second cylindrical body 2, the partition plate 11 and the like.

In other examples, the first cylinder 1 or the second cylinder can also be eliminated, and the infrared detector 3 or the acquisition circuit 4 can also be connected to the second cylinder 2 through a sliding mechanism (when the first cylinder 1 is eliminated) or The first cylinder body 1 (when the second cylinder body 2 is cancelled) is movably connected, and the sliding mechanism is driven by the driving device; the sliding mechanism such as guide rails and guide grooves are assembled on the guide rails, and the guide rails are assembled on the second cylinder body 2 in the guide groove. Wherein, the sliding mechanism can cooperate with the shaft and the bearing.

The display screen 15 is assembled on the frame 17 , and the frame 17 is made of a material with good thermal conductivity, such as metal material, to dissipate heat for the display screen 15 ;

Embodiment 2:

Different from the first embodiment, as shown in FIG. 2 , in this embodiment, the cylindrical wall of the first cylindrical body 1 is used as a constituent part of the front housing 9 , the partition plate 11 is used as a constituent part of the housing, and at the same time as the second cylindrical body. The rear wall of 2 fixes the stepping motor 14 to reduce the volume of the infrared thermal imager.

The structure between the first cylinder body 1 and the second cylinder body 2 inside the infrared thermal imager is similar to that of the first embodiment, and will not be repeated here.

The outer wall of the second cylindrical body 2, when used as the front housing 9, has heat dissipation grooves, heat dissipation fins, etc. on the outside; the rear wall of the second cylindrical body 2 has a hole passing through the motor drive shaft 13; preferably, the first cylindrical body The rear wall 15 of 1 is made of metal material; the rear wall of the second cylinder 2 is also made of non-metallic material.

The stepping motor 14 is fixed on the rear wall of the second cylinder 2, and the rear wall 21 of the second cylinder 2 is extended as a constituent part of the casing, and at the same time as a heat-insulating plate, dividing the interior of the infrared thermal imager into two parts. There are two cavities to ensure that the heat of the processing circuit board 12 is conducted to the area of the second cylinder 2 as little as possible.

In order to reduce the space occupied by the stepper motor 14 and the circuit board 12, an opening space is left on the circuit board 12 corresponding to the position of the stepper motor 14, so that the stepper motor 14 can pass through the circuit board 12; It is divided into multiple circuit boards for assembly and connection, so as to reduce the volume of the infrared thermal imager.

The instrument with the above structure can greatly reduce the volume and weight, and improve the heat dissipation structure.

Embodiment three:

As shown in FIGS. 5 and 8 , in this example, the stepping motor 14 is fixed on the bracket 24 of the second cylinder 2 ; preferably, it can also be fixed on the partition 26 or the partition 22 . In order to ensure stable operation of the stepping motor 14 and reduce vibration, the stepping motor 14 can be fixed not only to the partition plate 26 or the partition plate 22 , but also to the bracket 24 of the second cylinder 2 at the same time.

Embodiment 4:

Slightly different from Embodiment 1, as shown in Figures 6 and 7, an auto-focusing structure of a handheld infrared thermal imager includes a first compartment 21, a second compartment 22, and a first compartment in the first compartment. The third compartment 23 between 21 and the second compartment 22, the first compartment 21 is composed of the front end of the outer casing and the first partition 26, and the front end of the outer casing corresponding to the part of the thermal imaging detector is equipped with a thermal imager. For the lens, the connection between the first diaphragm 26 and the outer casing is a sealed connection.

The second compartment 22 is composed of the rear end of the outer casing and the second partition 27. Preferably, the connection between the second partition 27 and the outer casing is a sealed connection; preferably, one end of the second compartment 22 is a display screen frame, equipped with a display screen.

The third compartment 23 includes a first partition 26, a second partition 27, and an outer casing; preferably, the outer casing has a through hole or an open structure, such as a heat dissipation hole 29, so as to facilitate the communication with the outside air Circulation; so that the heat of the second compartment 22 is not easily conducted to the first compartment 21 .

An auto-focusing structure is arranged at the first compartment 21, which includes a first cylinder body, which is provided with an infrared detector; a second cylinder body, which is provided with an infrared lens, which is connected in a fixed relative position; The body and the second cylinder are relatively moved by the driving device.

The second compartment 2 is configured with a processing circuit 25, and the processing circuit 25 is configured with a circuit part with large heat, such as a display signal processing circuit, a storage processing circuit, a communication circuit, an analog-digital conversion circuit, etc., which can be one of them or Multiple, these modules can be configured on one or more circuit boards.

As shown in FIGS. 5 to 9 , the first cylinder body 1 may be provided with an assembly structure, which is used to assemble the infrared detector, and the assembly structure adopts a material with fast heat dissipation, such as a metal material; in order to improve the anti-interference of the infrared detector The assembly structure can be designed as a square cylinder type or a cylinder type. The assembly structure is equipped with an opening that conforms to the imaging of the detector to receive the light of the lens; for better heat dissipation, the assembly structure is equipped with a heat dissipation plate for dissipating heat for the infrared detector. The heat dissipation plate can be connected with the assembly structure; in order to conduct heat to the assembly structure, it is convenient for thermal balance of the infrared detector.

The infrared detection circuit may include an infrared detector and an acquisition circuit; the acquisition circuit is configured with, for example, an analog-to-digital conversion circuit, which is used to output the AD value data of the thermal image after analog-to-digital conversion of the analog signal output by the infrared detector. The acquisition circuit can be equipped with a heat dissipation plate; the heat dissipation plate adopts a material with good thermal conductivity, such as a metal material.

In other embodiments, the infrared detection circuit may only include an infrared detector, and the infrared detector has an analog-to-digital conversion circuit inside, and directly outputs the signal of the infrared detector, such as AD value data of the thermal image, through the pin interface.

In other embodiments, the infrared detection circuit may also have the functions of a part of the processing circuit; for example, one or both of the AD value data for outputting the thermal image and the data for outputting the processed thermal image for display, recording, etc. or at the same time. multiple. However, the processing circuit part with high power consumption should still be arranged in the second compartment 2 .

The infrared detector can be plugged on the socket for fixed connection, and the socket is welded on the acquisition circuit and passes through the heat sink.

The connection method between the acquisition circuit and the infrared detector can be configured in various ways. It can be connected in a fixed way, for example, the infrared detector can be welded or plugged into the acquisition circuit through a socket. It can also be an active connection, such as connecting the detector pins and the acquisition circuit via a flexible wire or FPC flex circuit. It can also be partly fixed connection and partly movable connection, such as partly using flexible wire or FPC flexible circuit connection, and partly using welding to the acquisition circuit.

The acquisition circuit can be divided into two parts, the part where the infrared detector is welded is assembled inside the first compartment 21 through the automatic focusing structure; Wire or flexible cable such as FPC line connection.

In one example, the acquisition circuit can be divided into two parts, the part where the detector is welded and the part where the analog-to-digital conversion circuit is configured, and the two are connected through the FPC flexible circuit 30 , which is configured at the second compartment 22 .

In another example, the detector is plugged into the acquisition circuit part through the socket, the infrared detector and the socket circuit are arranged in the first compartment 21, and the analog-to-digital conversion processing circuit part of the acquisition circuit generates a large amount of heat, so it can be It is arranged outside the first compartment 21 such as in the second compartment 22 .

It can be considered that the part of the acquisition circuit that generates less heat and is easy to design and implement is connected with the infrared detector and the auto-focusing structure, and is assembled inside the first compartment 21; while the part with high heat generation or difficult design and realization is connected to the infrared detector. Connected and assembled outside the first compartment 21 , eg the second compartment 22 .

In addition, there are through holes on the outer shell for air circulation; in addition, in order to provide strength and increase the heat dissipation effect and reduce the heat radiation between the partitions, partitions can also be added in the third compartment 23; so that the third compartment 23 contains one or more compartments.

As shown in FIG. 5 , the connection between the first partition plate 26 and the second partition plate 27 can also be deformed to be connected by other structural members, such as the column structure 28 .

The above-mentioned partition material can be made of various materials according to different designs and different requirements for heat dissipation, heat conduction and heat insulation. For the heat dissipation holes of the third compartment 23, it can be in various forms that facilitate air circulation; It can be equipped with a cooling fan. When the cooling fan is arranged on the first partition plate 21 or the second partition plate 22, its cooling effect is good, and it is easy to be configured to be imperceptible; beautiful.

The instrument with the above structure can greatly reduce the volume and weight, and improve the heat dissipation structure. It can be used as the whole of the instrument; further, related circuits and structures can be added, such as shells, partial shells, etc., to form various forms of instruments, such as various handheld thermal imagers, side-held portable thermal imagers, Online thermal imager, head-mounted thermal imager, etc. The electrical connection between the first compartment and the second compartment, etc., can be solved by leaving a wire slot in the connecting piece assembled by the two.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as are within the protection scope of the present invention.

Claims (10)

1. a kind of automatic focusing structure, which is characterized in that including be provided with infrared detector the first cylinder and with the first cylinder Second cylinder of relative movement, second cylinder is provided with infrared lens, by driving device make first cylinder with The relative movement of second cylinder.

2. the automatic focusing structure of a kind of instrument according to claim 1, which is characterized in that the outer wall of the first cylinder and second The inner wall of body is nested, and the part that contacts with each other is using thermally conductive good material.

3. the automatic focusing structure of a kind of thermal infrared imager according to claim 1, which is characterized in that infrared detection circuit packet It includes infrared detector and Acquisition Circuit, one of the infrared detector or Acquisition Circuit or is completely provided with heat sink, it is described to dissipate Hot plate is in contact with the first cylinder.

4. a kind of automatic focusing structure according to claim 3, which is characterized in that the infrared detector is provided with heat dissipation Plate, the Acquisition Circuit are set to the rear wall of the first cylinder, and the infrared detector is connect with Acquisition Circuit using inserting mode, The grafting circuit is set to Acquisition Circuit, the grafting for connecing lead and being plugged in Acquisition Circuit after heat sink of infrared detector At circuit.

5. a kind of automatic focusing structure according to claim 3, which is characterized in that the Acquisition Circuit includes infrared acquisition Device connects circuit and analog to digital conversion circuit, and infrared detector, which connects, passes through conducting wire or soft arranging wire between circuit and analog to digital conversion circuit Connection, infrared detector connection circuit are set in the first cylinder, and it is outer or second that analog to digital conversion circuit is set to the first cylinder Body.

6. a kind of automatic focusing structure according to claim 1, which is characterized in that the driving device includes that electricity is mechanical, electrical Machine drive shaft, the motor are fixed on inside thermal infrared imager, after the motor driving shaft passes through the second cylinder, drive first Body.

7. a kind of automatic focusing structure according to claim 6, which is characterized in that the motor may be disposed at the second cylinder The bracket of the partition or the setting of the second cylinder that are arranged inside the bracket or thermal imaging system being arranged inside place or thermal imaging system.

8. a kind of automatic focusing structure according to claim 1, which is characterized in that the driving device includes that electricity is mechanical, electrical Machine drive shaft, the motor are fixed on inside thermal infrared imager, and the motor driving shaft drives the second cylinder.

9. a kind of automatic focusing structure according to claim 8, which is characterized in that the motor may be disposed at the first cylinder The bracket of place or the setting of the first cylinder.

10. a kind of automatic focusing structure according to claim 6 or 8, which is characterized in that the motor is enclosed with metal-back Body.