CN110531953B

CN110531953B - Microfluidic logical operation unit and thin film lens focusing system

Info

Publication number: CN110531953B
Application number: CN201910798973.7A
Authority: CN
Inventors: 孙道恒; 周洲; 张昆鹏; 邱彬
Original assignee: Xiamen University
Current assignee: Xiamen University
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2021-06-15
Anticipated expiration: 2039-08-28
Also published as: CN110531953A

Abstract

The invention discloses a microfluidic logic operation unit and a film lens focusing system, which have a fluid structure of a logic network, are used for solving the problem that the control of the conventional pneumatic or hydraulic film lens depends on an electromagnetic valve system, and have the characteristics of light weight and integration. The solution of the invention based on the microfluidic digital pressure control technology establishes the addition relation between the focal length of the thin film lens and the input signal, provides a new method for controlling the thin film lens and other fluid lenses without being driven by an external electromagnetic valve, and simultaneously, the addition logic of the method is more beneficial to the understanding and the use of users. The invention discloses a microfluidic additive logic structure, wherein the output end of the additive logic is connected with a microfluidic decoder, the input pressure of a lens cavity is changed by controlling the opening and closing of flow channels with different flow resistances and applying the fluid partial pressure principle, and the function of adjusting the focal length of a multi-order lens with the same number of parallel multi-flow channels is realized.

Description

Microfluidic logical operation unit and thin film lens focusing system

Technical Field

The invention relates to a microfluidic logical operation unit, in particular to a microfluidic logical operation unit and a film lens focusing system based on the microfluidic logical operation unit.

Background

With the development of the optical system of modern electronic devices towards miniaturization and integration, especially the intensification of the requirements of 3D imaging and wide-angle imaging micro-lens heads, new requirements for the zoom performance of micro-lens arrays are provided. The traditional micro-lens array is made of materials such as glass, quartz, PMMA and the like through an etching or casting process, and although the structure can be miniaturized, the optical zooming action cannot be realized due to the characteristics of the materials. The fluid lens is a novel variable focus micro-lens technology which appears in recent years, the technology generates optical section curvature change through surface deformation of fluid under external force to realize adjustment of focal length, driving force can come from electrowetting, film deformation wrapping liquid drops, thermal deformation of fluid, optical deformation and the like, wherein a PDMS film lens is a special form of the fluid lens, the structure seals light-guide fluid in a closed cavity, the upper surface and the lower surface of the cavity are provided with elastic PDMS actuating films, when the fluid is subjected to pressure, the optical section of the fluid is sunken or raised due to the deformation of the films to cause focal length change, and continuous adjustment of the focal length is carried out according to different driving pressure. The technology overcomes many problems in the traditional liquid drop lens, such as limited caliber size and difficulty in manufacturing a large-caliber liquid lens; the instability of the optical axis easily causes serious image distortion; the driving voltage is higher and is generally more than 100V; the contact angle of a solid-liquid interface has a saturated value, and the focusing is nonlinear; high cost, etc. The elastic structure can be molded into a curved surface by casting and other processes, so that the film micro-lens has a huge application prospect in future bionic compound eye and other optical structures. In principle, the film lens is a structural form based on pressure driving, when the film lens is driven independently, the control structure is very simple, the on-off and the pressure of the lens can be adjusted through a single electromagnetic valve, but when a lens array consisting of a plurality of lenses needs to be controlled independently, n lenses need to correspond to n flow channels and control electromagnetic valves, and for a real biological compound eye, the number is about 1-3 ten thousand. The traditional control method cannot meet the requirements of lightweight and integration of the bionic structure, and a lightweight control unit needs to be found to replace an electromagnetic control system urgently.

The micro-fluidic film micro-valve is a fluid control element which takes an elastic film as a valve core and realizes the opening and closing of a flow channel by the attachment of the film and a wall surface. The fluid equivalent circuit principle is a fluid logic network design method which takes current as flow, resistance as flow resistance, voltage as pressure drop of fluid in a flow channel and capacitance as volume change of an elastic cavity. The fluid logic control device with circuit function can be obtained by coupling the equivalent circuit design principle of the fluid with the membrane micro-valve structure, wherein the input and the output are both air pressure or hydraulic pressure signals, so that the control of the fluid can be separated from the dependence on electromagnetic control. The patent US20080029169a1 proposes a large-scale array method of membrane microvalves, which combines the circuit structure of a decoder with a fluid network to design an n-way inlet control 2ⁿThe structure of the fluid network of the outlet is applied to a sample sorting and sampling device of a biochemical experiment, and the addressing sampling function of a plurality of component samples is realized. The structure verifies that the micro-fluidic isThe application potential in the field of pneumatic logic control. However, the logical mode of the decoder establishes the one-to-one correspondence relationship between the binary number and the output, and lacks the logical operation function, particularly requires the signal to generate the jump-type change in the input switching process, and is difficult to establish a clear numerical logical relationship for users.

Disclosure of Invention

The first purpose of the invention is to provide a microfluidic logical operation unit, which can perform logical operation based on the microfluidic unit and output an operation result;

the second purpose of the invention is to provide a film lens focusing system based on a microfluidic logical operation unit, so as to solve the problem of continuous focusing of the film lens;

the third objective of the present invention is to provide a thin film lens focusing system based on a microfluidic logical operation unit, which is applied to a large-scale thin film array to solve the problem of focusing control of the large-scale thin film lens array.

In order to achieve the first purpose of the invention, the invention provides the following technical scheme:

a microfluidic logical operation unit is specifically a half adder unit and comprises a first input end, a second input end, a carry output end, a carry inverted output end, a sum inverted output end and 9 microfluidic units;

the micro-fluidic unit is of a NOT gate structure and comprises a first signal flow channel, a second signal flow channel and a control flow channel, the first signal flow channel is configured with normal pressure, the second signal flow channel is configured with negative pressure, the control flow channel is an input end of the micro-fluidic unit, the second signal flow channel is an output end of the micro-fluidic unit, when the control flow channel inputs the negative pressure, input 1 is indicated, the first signal flow channel and the second signal flow channel are conducted, and the air pressure of the second signal flow channel is the normal pressure under the action of the first signal flow channel, and output 0 is indicated; when the input of the control flow channel is normal pressure, the input of 0 is indicated, the first signal flow channel and the second signal flow channel are separated, and the air pressure of the second signal flow channel is negative pressure under the action of negative pressure, and the output of 1 is indicated;

the first signal flow channels of the first micro-fluidic unit, the third micro-fluidic unit, the fourth micro-fluidic unit, the fifth micro-fluidic unit, the sixth micro-fluidic unit, the seventh micro-fluidic unit and the ninth micro-fluidic unit are connected with the normal pressure,

second signal flow channels of the second micro-fluidic unit, the third micro-fluidic unit, the fourth micro-fluidic unit, the fifth micro-fluidic unit, the sixth micro-fluidic unit, the seventh micro-fluidic unit and the eighth micro-fluidic unit are connected with negative pressure;

the first input end is connected with the control flow channel of the first micro-fluidic unit and the control flow channel of the fourth micro-fluidic unit; the second input end is connected with the control flow channel of the second micro-fluidic unit and the control flow channel of the fifth micro-fluidic unit;

the second signal flow channel of the second micro-fluidic unit is connected with the control flow channel of the third micro-fluidic unit;

the first micro-fluidic unit, the second micro-fluidic unit and the third micro-fluidic unit form a logic and structure, and a second signal flow channel of the third micro-fluidic unit is connected with the carry output end; the control flow channel of the third microfluidic control unit is connected with the carry reverse phase output end;

the second signal flow channel of the fourth micro-fluidic unit and the second signal flow channel of the fifth micro-fluidic unit are connected with the control flow channel of the sixth micro-fluidic unit;

the fourth microfluidic control unit, the fifth microfluidic control unit and the sixth microfluidic control unit form a logic or structure, and a second signal flow channel of the sixth microfluidic control unit is connected with a control flow channel of the ninth microfluidic control unit;

the control flow channel of the eighth microfluidic unit is connected with the second signal flow channel of the third microfluidic unit;

the control flow channel of the ninth microfluidic unit is connected with the second signal flow channel of the sixth microfluidic unit;

the seventh microfluidic control unit, the eighth microfluidic control unit and the ninth microfluidic control unit form a logic and structure, a first signal flow channel of the eighth microfluidic control unit is connected with a second signal flow channel of the ninth microfluidic control unit, the second signal flow channel of the eighth microfluidic control unit is connected with a control flow channel of the seventh microfluidic control unit, the second signal flow channel of the seventh microfluidic control unit is connected with the sum output end, and the control flow channel of the seventh microfluidic control unit is connected with the sum inverted output end.

A microfluidic logical operation unit is specifically a full adder unit and comprises a first half adder unit, a second half adder unit, a logical OR unit, a carry input end, a first input end, a second input end, a sum output end and a carry output end;

the first and second half-adder units are each the half-adder unit of claim 1;

the logical OR unit comprises a first input end, a second input end, an output end and an inverted output end;

the first input end of the full adder and the second input end of the full adder are respectively connected to the first input end of the first half adder and the second input end of the first half adder, and the carry input end of the full adder is connected to the first input end of the second half adder;

the sum bit output end of the first half adder is connected to the second input end of the second half adder, and the carry output end of the first half adder and the carry output end of the second half adder are respectively connected to the first input end and the second input end of the logical OR unit;

the output end of the logic OR unit is connected with the carry output end of the full adder, and the inverted output end of the logic OR unit is connected with the carry inverted output end of the full adder;

the sum bit output end of the second half adder is connected with the sum bit output end of the full adder;

and the sum bit inverted output end of the second half adder is connected with the sum bit inverted output end of the full adder.

Further, the logic or unit comprises a tenth microfluidic unit, an eleventh microfluidic unit and a twelfth microfluidic unit,

the first signal flow channels of the tenth micro-fluidic unit and the eleventh micro-fluidic unit are connected with normal pressure, and the second signal flow channels of the tenth micro-fluidic unit and the eleventh micro-fluidic unit are connected with negative pressure;

the second signal flow channel of the tenth micro-fluidic unit and the second signal flow channel of the eleventh micro-fluidic unit are also connected with the control flow channel of the twelfth micro-fluidic unit, the first signal flow channel of the twelfth micro-fluidic unit is connected with normal pressure, and the second signal flow channel of the twelfth micro-fluidic unit is connected with negative pressure and output as the output end of the logic OR unit; and the control flow channel output of the twelfth microfluidic unit is used as the inverted output end of the logic OR unit.

A microfluidic logical operation unit, in particular an N-bit adder unit, the N-bit adder unit comprising N cascaded full adder units, the full adder units being the full adder unit of claim 2, the N-bit adder unit comprising N first input terminals, N second input terminals, N sum-bit output terminals, N sum-bit inverted output terminals, and a carry input terminal, a carry output terminal, and a carry inverted output terminal;

the carry input end of a1 st full adder of the N-bit adder unit is set to be logic 0; the carry output end of the nth full adder unit is connected with the carry input end of the (n + 1) th full adder; the carry output end of the Nth full adder is the carry output end of the N-bit adder unit; the carry inverting output end of the Nth full adder is the carry inverting output end of the N-bit adder unit;

the sum bit output end of the nth full adder is the nth sum bit output end of the N-bit adder unit;

the sum bit inverted output end of the nth full adder is the nth sum bit inverted output end of the N-bit adder unit;

wherein N is 1,2, …, N.

In order to achieve the second object of the present invention, the present invention provides the following technical solutions:

a film lens focusing system based on a microfluidic logical operation unit comprises the microfluidic logical operation unit, a digital pressure regulator and a film lens,

the microfluidic logical operation unit is an N-bit adder unit and is provided with an N-bit first input end, an N-bit second input end, an N-bit sum output end, an N-bit sum inverted output end, a carry output end and a carry inverted output end;

the digital pressure regulator comprises flow channels with different resistance values, the flow channels are controlled by the microfluidic control unit, control flow channels of the microfluidic control unit are respectively communicated with the output end of the microfluidic logical operation unit, and the output end of the digital pressure regulator is communicated with the pressure inlet of the thin film lens; and combining the fluid pressure quantized values output by the microfluidic logical operation unit through opening different flow channels of the digital pressure regulator, and converging the fluid pressure quantized values into the fluid pressure corresponding to the fluid pressure quantized values of a single flow channel, wherein the thin film lens adjusts the focal length of the thin film lens according to the fluid pressure.

Furthermore, the film lens is a through hole structure with two ends sealed by the elastic film, the through hole structure is led out through a pressure inlet on the side wall of the cavity, and the continuous change of the central curvature of the elastic film is realized by adjusting the input pressure of the through hole structure, so that the purpose of continuous focusing is achieved.

In order to achieve the third object of the present invention, the present invention provides the following technical solutions:

a film lens focusing system based on a microfluidic summator comprises a controller, a microfluidic logical operation unit, a digital pressure regulator, a microfluidic decoder and a film lens array,

the microfluidic decoder comprises a plurality of gating control flow channels, a common flow channel and a plurality of output flow channels, wherein the output flow channels are communicated with the thin film lenses of the thin film lens array in a one-to-one correspondence manner; the gating control runners are communicated with the common runner by combining and gating a certain output runner;

the output flow channel of the microfluidic logical operation unit is communicated with the input flow channel of the digital pressure regulator, the fluid pressure quantized value is converted into the fluid pressure of a single flow channel, and the fluid pressure is output from the output flow channel of the digital pressure regulator;

and the output flow channel of the digital pressure regulator is communicated with the common flow channel of the microfluidic decoder.

Further, the microfluidic decodingThe device comprises 2N gating control flow channels, 1 input flow channel and 2^NAn output flow passage 2^NOne end of each output flow channel is connected in parallel and communicated with the input flow channel,

the gating control flow channel and the output flow channel are crossed according to gating logic and are distributed in an array, each control node is a micro-fluidic unit,

the microfluidic units on the same output flow channel form a logical AND, and when all the microfluidic units on the same output flow channel are opened, the output flow channel is conducted;

and the micro-fluidic units on the same gating control flow channel are simultaneously opened and closed.

The 2N gating control flow channels are N pairs of opposite gating control flow channels, and each pair of gating control flow channels only allows one to be opened at the same time.

The invention provides a microfluidic logical operation unit, in particular to a structure of a microfluidic half adder, which is formed by expanding the structure of the microfluidic half adder to form the structures of a microfluidic full adder and a microfluidic adder, and solves the problem of logical operation control in microfluidic control.

The invention provides a focusing system of a thin film lens based on a microfluidic logical operation unit, which combines the microfluidic logical operation unit and a digital pressure regulator to convert a fluid pressure quantized value into the fluid pressure of a single flow channel, and solves the problem of continuous focusing of the thin film lens by continuously changing the fluid pressure quantized value;

the invention provides a focusing system of a thin film lens based on a microfluidic logical operation unit, which is further combined with a microfluidic decoder to realize gating of the thin film lens of a thin film lens array so as to solve the problem of focusing control of the large-scale thin film lens array.

Drawings

FIG. 1 is a schematic diagram of a microfluidic logic cell based thin film lens focusing system according to the present invention;

FIG. 2 is a cross-sectional view of a thin film lens of the present invention;

FIGS. 3A and 3B are diagrams illustrating the operation of the microvalve;

FIG. 4 is a schematic view of a microvalve structure of the present invention;

FIG. 5 is a schematic diagram of the structure of the microfluidic half-adder of the present invention;

FIG. 6 is a schematic diagram of the logic interface of the microfluidic half-adder of the present invention;

FIG. 7 is a schematic diagram of a microfluidic logic OR configuration;

FIG. 8 is a schematic diagram of a logic interface of a microfluidic logic OR;

FIG. 9 is a logic block diagram of a microfluidic full adder;

FIG. 10 is a logic block diagram of a 4-bit microfluidic full adder;

FIG. 11 is a functional block diagram of a thin film lens array control system;

fig. 12 is a schematic diagram of a microfluidic decoder array structure.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Example one

As shown in fig. 1, the invention discloses a functional schematic diagram of a thin film lens focusing system based on a microfluidic logic operation unit, and the overall system is as shown in fig. 1, and since the n-bit system is too large, a 2-input and 3-order output structure is taken as an example for explanation. The system consists of a microfluidic digital half adder 01, a digital pressure regulator 02 and a film lens 03, wherein the logical relation is realized by a NOT gate structure formed by a single film microvalve 04, one path of input pressure signal Q can be converted into a non-Q output signal, a port A is an added end of a binary addition, a port B is an adding end of the binary addition, the input pressure signal is normal pressure and represents that the bit is 0, and the input pressure signal is vacuum pressure and represents that the bit is 1. The digital adder is connected by a logic adder circuit in the circuit, adds the signals of the input port A and the port B and outputs the sum bit S and the carry bit C, and if the signals of the input port A and the port B are respectively 0 and 1, the sum bit S and the carry bit C corresponding to the output end are respectively 1 and 0. In the structure of the microfluidic digital half-adder 01,

ports

07, 08, 10, 11, 15 and 16 are connected with vacuum air pressure,

ports

09, 12, 17, 18, 19 and 20 are connected with atmospheric environment (normal pressure), wherein a closed flow channel where the

ports

08 and 16 are located is an output port of the half-adder, the signal is connected into a digital pressure regulator 02, and the digital pressure regulator 02 is arranged according to the method of a microfluidic digital decoder to drive the opening and closing of different flow channels. In order to realize the adjustment of the input pressure of the thin film lens 03, the flow channel of the decoder representing decimal numbers is designed into different resistance values of the flow resistance, and the pressure entering the cavity of the thin film lens 03 is adjusted according to the partial pressure principle of the serial flow resistance. The gas in the flow channel of the port 14 and the port 21 flows into the atmosphere after passing through the high flow resistance, and the other outlet of the pressure divider is a closed wall surface, so that the flow resistance is infinite. Three flow resistance branches similar to the decoder structure are connected in parallel and converged in the cavity of the thin film lens 03, and the port 13 is located between the parallel flow resistance and the thin film lens 03 and provides input pressure for the operation of the thin film lens 03. When the flow channels with different flow resistances are opened, the pressure acting in the lens cavity changes due to the serial partial pressure of the fluid, resulting in the change of the deflection of the thin film lens 03 and the change of the focal length. If a binary 0 represents a pressure of 0 and a binary 1 represents a pressure of p, the following binary addition logic is established by the digital pressure regulator 02: 00+00 ═ 0Pa, 00+01 ═ Δ ρ Pa, 01+00 ═ 01 ═ Δ ρ Pa, 01+01 ═ 10 ═ 2 Δ ρ Pa …. According to the design principle in the circuit, half adders can be combined to form a full adder, and the full adders are combined in series to form a multi-bit full adder, so that the logic design method has strong expansibility.

As shown in fig. 2, the film lens 03 has a through-hole structure 23 closed at both ends by elastic films 22, and the hole pattern is generally a circular or regular polygonal structure. The through hole structure 23 is led out through the flow channel 24 of the cavity side wall and connected with the microfluidic device. When the input pressure of the through hole structure 23 is positive pressure, the elastic film 22 protrudes outwards, and the film cavity has a convex lens characteristic, has a focusing effect on light and forms an enlarged real image; when the input pressure of the via structure 23 is further reduced to a vacuum negative pressure, the elastic film 22 is recessed inward and imaged as a contracted virtual image. The continuous change of the center curvature of the film lens 03 can be realized by adjusting the input pressure of the through hole structure 23, such as

curves

221, 222 and 222 in fig. 2, which represent different center curvatures of the film, thereby achieving the purpose of continuous focusing.

In application, the thin film lenses are distributed in an array, the distribution mode of the lens array is not limited, the thin film lenses can be distributed in a plane or in a three-dimensional curved surface, and can be a hard substrate or a soft substrate, but it is required to ensure that the thin film lens 03 of each unit in the lens array is connected with a micro valve (or a micro-fluidic unit) through an external pipeline or an internal flow channel.

The micro valve is a logic negation unit and is a basic unit for forming the micro-fluidic logic unit, in a logic circuit, a signal Q is converted into a signal negation Q through a NOT gate, and the signal Q is led out at the same time, so that two output signals which are opposite in time are obtained: signal Q and signal non-Q. In the fluid layout, the operating state of the microvalve is as shown in fig. 3A and 3B, the microvalve in this embodiment is a fluid control element that uses an elastic film as a valve core and realizes opening and closing of a flow channel by the attachment of the film and a wall surface, and includes an upper wall, a lower wall, and a film 26, where the film 26 and the upper wall form an upper flow channel 27, the upper wall is provided with a protrusion, when the protrusion is attached to the film 26, the upper flow channel 27 is closed, the film 26 and the lower wall form a lower flow channel 25, and when the lower flow channel 25 is at normal pressure, the upper surface of the film 26 is pressed upward, the upper flow channel 27 is closed, and the microvalve is closed; when negative pressure is input into the lower flow channel 25, the membrane 26 is subjected to downward resultant force due to the pressure difference between the upper and lower surfaces of the membrane 26, and the membrane 26 is structurally separated from the upper flow channel 27, so that the micro valve is opened. The upper channel 27 divides the pressing force flow into a first signal channel and a second signal channel, the first signal channel is generally configured to be a normal pressure, the second signal channel is configured to be a negative pressure, the lower channel 25 is a control channel, when the lower channel 25 inputs the negative pressure, it indicates that input 1, the first signal channel and the second signal channel are conducted, and the second signal channel indicates a normal pressure, and it indicates that output 0.

More specifically, as shown in fig. 4, there is a structure of a micro valve, which is provided with a plurality of input/output ports, wherein the port 28 is a signal Q input end, and is connected with a control flow channel of the micro valve; the port 29 is a signal Q output end and is led out from the port 28; the port 30 is a signal non-Q output end and is connected with a second signal flow channel of the micro valve; the port 31 is connected with a constant pressure negative pressure source and is simultaneously connected with a second signal flow channel of the micro valve, and the port 32 is an atmospheric pressure (normal pressure) inlet and is connected with a first signal flow channel of the micro valve; the flow passage connected to the port 31 is narrow, and when the port 32 communicates with the port 30, the pressure of the port 30 is kept the same as that of the port 32, and is normal pressure. The control logic takes negative pressure as 1 and normal pressure as 0. When the port 28 inputs 1, the micro valve is opened, the port 30 is communicated with the port 32, and the port 30 outputs normal pressure, namely outputs 0; conversely, when port 28 is fed with a0, the microvalve is closed, port 30 and port 32 are disconnected, and the air pressures at port 30 and port 31 are kept at the same negative pressure, i.e., output 1.

The structure form of the micro valve has an input end and 2 output ends: the signal Q input end, the signal Q output end and the signal non-Q output end are required to be simultaneously applied in the digital decoder.

When the micro valve is used to form logic operation circuits such as logical and units, logical or units, half adders, full adders and the like, the structure of the micro valve shown in fig. 4 may not be used, and the signal Q output terminal is not required to be provided.

As shown in fig. 5 and 6, the microfluidic half-adder is formed by 9 microvalves, and has two input ends: addend A, summand B and four output ends: and a sum bit output terminal S, a sum bit inversion output terminal/S, a carry output terminal C0, and a carry inversion output terminal/C0.

Fig. 5 is a schematic structural diagram of a pressure-driven microfluidic half adder, a truth table of which is shown in table 1, fig. 5 includes 9 micro valves, each of which is a logical not unit, and is combined with fig. 1, where the micro valves K1, K2, and K3 form a logical and unit,

ports

05 and 06 are input terminals, port 07 is a logical nand output terminal, and port 08 is a logical and output terminal, when both port 05 and port 06 input a1, port 07 outputs 0, port 08 outputs 1, port 08 is simultaneously connected to port 36, port 36 is a carry output terminal of the half adder, and outputs a carry signal C0, port 07 is simultaneously connected to port 35, and port 35 is a carry inverting output terminal of the half adder and outputs a carry inverting signal/C0.

The micro valves K4, K5, and K6 form a logic or unit, the input signals of the

ports

05 and 06 control the micro valve K4 and the micro valve K5, respectively, the second signal flow channels of the micro valve K4 and the micro valve K5 are connected to the control flow channel of the micro valve K6, and when the input end (control flow channel) of the micro valve K4 or the micro valve K5 inputs 1, the output end (second signal flow channel) of the micro valve K6 outputs 1.

The micro valves K7, K8 and K9 form a logic AND unit, the input end of the micro valve K9 is connected with the output end of the micro valve K6, and the input ends of the micro valve K9 are respectively the output ends of a port 07 and a micro valve K6; the second signal flow channel of the micro valve K9 is connected with the first signal flow channel of the micro valve K9, the second signal flow channel of the micro valve K8 is connected with the control flow channel of the micro valve K7, the second signal flow channel of the micro valve K7 is connected with the sum output end 33 of the half adder to output a sum signal S, and the control flow channel of the micro valve K7 is connected with the sum inverted output end 34 of the half adder to output a sum inverted signal/S.

TABLE 1 half adder truth table

Input A	Input B	Sum bit S	Carry C0
					0	0	0	0
0	1	1	0
				1	0	1	0
1	1	0	1

The specific logic expression is as follows:

C₀＝AB

for higher order numerical addition operations, full adders are required, and this architecture can be obtained by interconnecting using half adders as described above, in the same manner as the multi-bit adder principle in the circuit, as shown in fig. 9. The full adder comprises a half adder 37, a half adder 38 and a logic OR unit 39, and further comprises an input end A, an input end B, a carry input end C0, a sum bit output end S, a sum bit inverse output end/S, a carry output end C1 and a carry inverse output end/C1, wherein the input end A and the input end B are respectively connected with a first input end and a second input end of the half adder 37, and are used for inputting addends and addends; carry input terminal C0 is connected to the first input terminal of half adder 38, and inputs carry input signal C0, the sum output terminal of half adder 37 is connected to the second input terminal of half adder 38, the sum output terminal of half adder 38 is connected to the sum output terminal S of full adder, the result is a sum output signal S of one-bit binary addition, the carry output terminal of half adder 38 and the carry output terminal of half adder 37 perform logical or operation, the result is a carry output signal C1 of one-bit binary addition and its inverted signal-carry inverted output signal/C1, wherein the structure and logical interface of logical or unit 39 are shown in fig. 7 and 8. Referring to fig. 7, the microvalves K10, K11, K12 constitute a logical or

unit including inputs

41 and 42, an output 44 and an inverting output 43, the inputs a and B in fig. 8 corresponding to the

inputs

41 and 42, respectively, in fig. 7, and C and/C in fig. 8 corresponding to the output 44 and the inverting output 43, respectively, in fig. 7. When more than two-bit binary operation is required, further expansion can be performed according to the same connection principle of the circuit adder, full adders are connected in series to form a multi-bit operation capability microfluidic adder unit, such as a logic block diagram of a 4-bit full adder shown in fig. 10, including 4 full adders 50, X3, X2, X1, X0 and Y3, Y2, Y1, and Y0, which are added to obtain sum bit output signals S3, S2, S1, S0 and carry output C, and obtain respective sum bit inverted output signals/S3,/S2,/S1,/S0 and carry inverted output signal/C.

Example two

In the first embodiment, the thin film lens focusing system based on the microfluidic logic operation unit controls a single thin film lens through the microfluidic adder and the digital pressure regulator. In a specific application, as shown in fig. 11, the thin film lenses are arranged in an array to form a thin film lens array 105, in order to implement independent control of a single thin film lens in the thin film lens array 105, a control system including a controller 101, a microfluidic adder 102, a digital pressure regulator 103, and a microfluidic decoder 104 needs to be established, a common pressure flow channel of the microfluidic decoder 104 is communicated with a pressure output flow channel of the digital pressure regulator 103, and addressing of the thin film lens array 105 is implemented through the microfluidic decoder 104, so that the pressure output flow channel of the digital pressure regulator 103 is communicated with a pressure inlet (e.g., flow channel 24 in fig. 2) of the addressed thin film lens. Implementing thin film lens arrays by microfluidic decoder 104The micro-fluidic decoder with N-bit input can realize the control of the flow channel (the gating signal and the inverse signal thereof) to 2 pairs through N pairs of gating control flow channels^NGating the output flow channel, and controlling 2^NA thin film lens. The schematic structural diagram of the microfluidic decoder 103 is shown in fig. 12, fig. 12 shows a three-eight decoder, the output channels AD0, AD1, … and AD7 in fig. 12 are connected with the pressure inlet (e.g., channel 24 in fig. 2) of the thin film lens, a0/a1, B0/B1 and C0/C1 are 3 pairs of gate control channels, and are connected with the microfluidic controller 101 in fig. 11, and COM is a common pressure channel, which corresponds to a COM end of the microfluidic decoder 104 in fig. 11. The microfluidic controller 101 is connected to the microfluidic adder 102 via the flow channel and microfluidic decoder 104.

As shown in fig. 12, the micro valves 1051 in the same output channel 1052 are logically anded, and when all the micro valves 1051 in the same output channel 1052 are opened, the output channel 1052 is conducted; the micro valves 1051 on the same vertical gating control flow channel 1053 are opened and closed at the same time; the 2N gating control runners 1053 form N pairs of gating control runners, each pair of gating control runners only allows one gating control runner to open at the same time.

In the embodiment of the present invention, a quantized value of the pressure adjustment is given by the microfluidic adder 102, and is converted into a fluid pressure of a single flow channel corresponding thereto by the digital pressure adjuster 103, and further, the specified thin film lens is gated by the microfluidic decoder 104, and the quantized fluid pressure is input to the addressed thin film lens, so as to implement the focusing control of the selected thin film lens.

The film lens focusing system based on the microfluidic logic operation unit solves the problem that pneumatic or hydraulic film lens control depends on an electromagnetic valve system, and has the characteristics of light weight and integration.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a film lens focusing system based on micro-fluidic logic arithmetic unit which characterized in that: comprises a micro-fluidic logic operation unit, a digital pressure regulator and a film lens,

the micro-fluidic logic operation unit is an N-bit adder unit, comprises N cascaded full adder units and is provided with a carry input end, an N-bit first input end, an N-bit second input end, an N-bit sum output end, an N-bit sum inverted output end, a carry output end and a carry inverted output end;

the cascade relation of the full adder unit inside the N-bit adder unit is as follows: the nth first input end and the nth second input end of the N-bit adder unit respectively correspond to the first input end and the second input end of the nth full adder unit; the nth bit sum output end and the nth bit inversion output end of the N-bit adder unit respectively correspond to the sum output end and the sum inversion output end of the nth full adder unit; the carry input end of the N-bit adder unit is the carry input end of the 1 st full adder unit; the carry output end of the nth full adder unit is connected with the carry input end of the (n + 1) th full adder unit; the carry output end of the N-bit adder unit is the carry output end of the Nth full adder unit; wherein N is 1,2, …, N;

2. The microfluidic logic cell based thin film lens focusing system of claim 1, wherein: the film lens is a through hole structure with two ends sealed by an elastic film, the through hole structure is led out through a pressure inlet on the side wall of the cavity, and the continuous change of the central curvature of the elastic film is realized by adjusting the input pressure of the through hole structure, so that the purpose of continuous focusing is achieved.

3. The microfluidic logic cell based thin film lens focusing system of claim 1, wherein: the full adder unit comprises a first half adder unit, a second half adder unit, a logic OR unit, a carry input end, a first input end, a second input end, a sum bit output end and a carry output end;

a first input end and a second input end of the full adder unit are respectively connected to a first input end and a second input end of the first half adder unit, and a carry input end of the full adder unit is connected to a first input end of the second half adder unit;

the sum bit output end of the first half adder unit is connected to the second input end of the second half adder unit, and the carry output end of the first half adder unit and the carry output end of the second half adder unit are respectively connected to the first input end and the second input end of the logical OR unit;

the output end and the reverse output end of the logic OR unit are respectively connected to the carry output end and the carry reverse output end of the full adder unit;

the sum bit output end of the second half adder unit is connected with the sum bit output end of the full adder unit;

and the sum bit inverted output end of the second half adder unit is connected with the sum bit inverted output end of the full adder unit.

4. The microfluidic logic cell based thin film lens focusing system of claim 3, wherein: the half adder unit comprises a first input end, a second input end, a carry output end, a carry inverted output end, a sum inverted output end and 9 micro-fluidic units;

5. The microfluidic logic cell based thin film lens focusing system of claim 3, wherein: the logic or unit comprises a tenth microfluidic unit, an eleventh microfluidic unit and a twelfth microfluidic unit,

6. The utility model provides a film lens focusing system based on micro-fluidic logic arithmetic unit which characterized in that: comprises a micro-fluidic controller, a micro-fluidic logic operation unit, a digital pressure regulator, a micro-fluidic decoder and a thin film lens array,

7. The microfluidic logic cell based thin film lens focusing system of claim 6, wherein:

the microfluidic decoder comprises 2N gating control flow channels, 1 input flow channel and 2^NAn output flow passage 2^NOne end of each output flow channel is connected in parallel and communicated with the input flow channel,

the microfluidic units on the same gating control flow channel are opened and closed simultaneously;

the 2N gating control flow channels are N pairs of gating control flow channels, and each pair of gating control flow channels only allows one of the gating control flow channels to be opened at the same time.

8. The microfluidic logic cell based thin film lens focusing system of claim 6, wherein: the full adder unit comprises a first half adder unit, a second half adder unit, a logic OR unit, a carry input end, a first input end, a second input end, a sum bit output end and a carry output end;

9. The microfluidic logic cell based thin film lens focusing system of claim 8, wherein: the half adder unit comprises a first input end, a second input end, a carry output end, a carry inverted output end, a sum inverted output end and 9 micro-fluidic units;

10. The microfluidic logic cell based thin film lens focusing system of claim 8, wherein: the logic or unit comprises a tenth microfluidic unit, an eleventh microfluidic unit and a twelfth microfluidic unit,