Variable aperture

Abstract

A variable aperture comprises a fixed seat, a rotating seat, an elastic body, a connecting component and a plurality of blades. The rotating seat is arranged on the inner side of the fixed seat. And each blade is rotationally connected with the fixed seat and is slidably connected with the rotating seat. The first end of the elastic body is fixedly connected with the side face of the fixing base, and the second end of the elastic body is connected with the first end of the connecting component. When the length of the elastic body is changed, the elastic body generates length expansion and contraction amount, and the rotating seat rotates relative to the fixed seat according to the length expansion and contraction amount.

Description

Technical Field

[0001] The invention relates to an optical element, in particular to a variable aperture. Background Art

[0002] Traditional apertures are mostly driven by voice coil motors, which have no advantages in size and weight, and are easily affected by external magnetic fields. The internal drive current can also cause overheating, which in turn affects the optical quality. Summary of the invention

[0003] The present invention provides a variable aperture which can accurately control the aperture size without using a voice coil motor.

[0004] According to one embodiment of the present invention, a variable aperture is provided, comprising a fixed seat, a rotating seat, an elastic body, a connecting member and a plurality of blades. The rotating seat is arranged on the inner side of the fixed seat. Each blade is rotatably connected to the fixed seat and slidably connected to the rotating seat. The first end of the elastic body is fixedly connected to the side of the fixed seat, the second end of the elastic body is connected to the first end of the connecting member, and the second end of the connecting member is connected to the rotating seat. When the length of the elastic body changes, the elastic body generates a length expansion and contraction, and the rotating seat rotates relative to the fixed seat according to the length expansion and contraction.

[0005] Based on the above, the variable aperture provided by the embodiment of the present invention uses multiple blades to define the aperture size, and uses an elastic body to drive the rotating seat to rotate, thereby driving the blades to rotate, so as to achieve the purpose of accurately adjusting the aperture. Compared with the traditional aperture, the variable aperture provided by the embodiment of the present invention avoids the problems of coil heating and optical quality degradation.

[0006] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 , Figure 2 , Figure 3 as well as Figure 4 Partial structural schematic diagrams of variable apertures according to some embodiments of the present invention are respectively shown;

[0008] Figure 5 Schematic diagram showing an elastic body and a connecting member according to some embodiments of the present invention; Figure 6 Schematic diagram showing an elastomer according to some embodiments of the present invention.

[0009] Description of Figure Numbers:

[0010] 1: Variable aperture

[0011] 100: Elastomer

[0012] 101:Metal Structure

[0013] 102: memory alloy wire

[0014] 103, 104, 105, 106, 110, 120, 201, 202:

[0015] 107: Diamond structure

[0016] 200: Connecting components

[0017] 300: Fixed seat

[0018] 300H: Side hole of fixed seat

[0019] 301, 401: Column

[0020] 400: Rotating seat

[0021] 500: Blade

[0022] 500H: light hole

[0023] 501, 502: through hole DETAILED DESCRIPTION

[0024] Reference Figures 1 to 6 , which respectively show partial structural schematic diagrams of the variable aperture according to some embodiments of the present invention.

[0025] The variable aperture 1 provided in the embodiment of the present invention comprises an elastic body 100, a connecting member 200, a fixed seat 300, a rotating seat 400 and a plurality of blades 500. The blades 500 define a light-through hole 500H, and the fixed seat 300 and the rotating seat 400 are both hollow annular structures. The light-through hole 500H communicates the space inside the fixed seat 300 and the rotating seat 400. Therefore, the purpose of variable aperture can be achieved by changing the size of the light-through hole 500H.

[0026] like Figure 1 as well as Figure 2As shown, the rotating seat 400 is arranged on the inner side of the fixed seat 300 and can rotate relative to the central axis. When the rotating seat 400 rotates, the fixed seat 300 can be fixed. The fixed seat 300 includes a plurality of columns 301, and the rotating seat 400 includes a plurality of columns 401. Each blade 500 includes a first through hole 501 and a second through hole 502. Each column 301 passes through the first through hole 501 of the corresponding blade 500. That is, each blade 500 is rotatably connected to the fixed seat 300 through each column 301. Each column 401 passes through the second through hole 502 of the corresponding blade 500, wherein the size of each second through hole 502 allows the corresponding column 401 to move in its hole. That is, each blade 500 is slidably connected to the rotating seat 400 through each column 401. Further, when the rotating seat 400 rotates and the fixed seat 300 is fixed, each blade 500 can rotate with the column 301 as a fulcrum. The light-transmitting hole 500H formed by the blades 500 may change in size due to the rotation of the blades 500 .

[0027] Also refer to Figure 1 , Figure 3 , Figure 4 as well as Figure 5 . It should be noted that the elastomer 100 is arranged at the periphery of the fixed seat 300 away from the rotating seat 400, and the elastomer 100 is connected to the rotating seat 400 through the connecting member 200. Specifically, the elastomer 100 includes a first end 110 and a second end 120, and the connecting member 200 includes a first end 201 and a second end 202. The first end 110 of the elastomer 100 is fixedly connected to the outer surface of the fixed seat 300, the second end 120 of the elastomer 100 is slidably connected to the first end 201 of the connecting member 200, and the second end 202 of the connecting member 200 is rotatably connected to the rotating seat 400, wherein the connecting member 200 passes through the fixed seat side hole 300H to connect the elastomer 100 and the rotating seat 400.

[0028] Since the first end 110 of the elastic body 100 is fixedly connected to the outer surface of the fixing seat 300, when the length of the elastic body 100 changes (the elastic body 100 generates a length expansion), the elastic body 100 can apply force to the connecting member 200 through its second end 120. In addition, since the second end 120 of the elastic body 100 is slidably connected to the first end 201 of the connecting member 200, and the second end 202 of the connecting member 200 is rotatably connected to the rotating seat 400, when the connecting member 200 is subjected to the force from the elastic body 100, the force can drive the rotating seat 400 to rotate relative to the fixing seat 300, thereby rotating each blade 500, so that the size of the light-transmitting hole 500H changes, thereby achieving the purpose of adjusting the aperture. For example, in some embodiments, when the length of the elastic body 100 increases, the light-transmitting hole 500H formed by the blades 500 becomes smaller.

[0029] Please refer to Figure 1 , Figures 3 to 6 . The elastomer 100 includes a metal structure 101 and a plurality of memory alloy wires 102. The material of the metal structure 101 may include copper, for example, but is not limited thereto. The metal structure 101 includes a plurality of rhombus structures 107, and each rhombus structure 107 includes a first end 103 and a second end 104 opposite to each other, and a third end 105 and a fourth end 106 opposite to each other. The surface of each memory alloy wire 102 has an insulating layer, and its length can be changed by powering on and heating up. The first ends 103 and the second ends 104 are connected by the memory alloy wires 102, respectively. When the length of the memory alloy wires 102 changes, the distance between the first ends 103 and the second ends 104 changes. Accordingly, the rhombus structures 107 can be deformed, and the third ends 105 and the fourth ends 106 move, thereby changing the overall length of the elastomer 100, so that the rotating seat 400 rotates relative to the fixed seat 300, thereby achieving the purpose of adjusting the aperture. Based on the above, by controlling the length of each memory alloy wire 102 , the aperture size of the variable aperture 1 can be precisely controlled.

[0030] like Figure 1 , Figure 4 as well as Figure 5 As shown, the fixing base 300 may have an octagonal profile, for example, and the metal structure 101 of the elastomer 100 may include four diamond structures 107, wherein the four diamond structures 107 are respectively located on the four sides of the octagon. However, the present invention is not limited thereto. In some embodiments, the fixing base 300 may have an N-gonal profile, and the metal structure 101 includes n diamond structures 107, wherein N and n are both positive integers greater than 1. In some embodiments, N is an even number, but is not limited thereto. In some embodiments, n is less than or equal to N / 2, but is not limited thereto.

[0031] Reference Figure 6, the length expansion ΔL of the elastic body 100 can be defined by the length expansion ΔM of each diamond structure 107. Specifically, when each memory alloy wire 102 is energized and thus changes its length, the length expansion ΔM of each diamond structure 107 meets the conditional formula, ΔM=2*d*Sr*tanθ, where d is the distance between the first end 103 and the second end 104 of each diamond structure 107, Sr is the expansion rate of each memory alloy wire 102, and θ is half of the inner angle of each diamond structure 107 at the first end 103 and the second end 104. When each diamond structure 107 generates a length expansion ΔM, the length expansion of the elastic body 100 having n diamond structures 107 is ΔL, and ΔL=n*ΔM, where the length expansion ΔM of each diamond structure 107 and the length expansion ΔL of the elastic body 100 are both expansions in a direction perpendicular to the connecting direction of the first end 103 and the second end 104.

[0032] Based on the above, the variable aperture provided by the embodiment of the present invention uses multiple blades to define the aperture size, and uses an elastic body to drive the rotating seat to rotate, thereby driving the blades to rotate, so as to achieve the purpose of adjusting the aperture. Compared with the traditional aperture, the variable aperture provided by the embodiment of the present invention avoids the problems of coil heating and optical quality degradation.

Claims

1. A variable aperture, characterized in that: It includes a fixed seat, a rotating seat, an elastic body, a connecting member and a plurality of blades; The rotating seat is arranged on the inner side of the fixed seat; Each of the blades is rotatably connected to the fixed seat and slidably connected to the rotating seat; The first end of the elastomer is fixedly connected to the side surface of the fixed seat, the second end of the elastomer is connected to the first end of the connecting member, and the second end of the connecting member is connected to the rotating seat; when the length of the elastomer changes, the elastomer produces a length expansion and contraction, and the rotating seat rotates relative to the fixed seat according to the length expansion and contraction.

2. The variable aperture according to claim 1, characterized in that: The elastic body includes a metal structure and a plurality of memory alloy wires arranged on the metal structure, and each of the memory alloy wires is used to change the length of the elastic body.

3. The variable aperture according to claim 2, characterized in that: The metal structure surrounds the fixing base, and the fixing base has an N-sided outline. The metal structure includes n diamond structures, N and n are positive integers greater than 1, and the n diamond structures include a plurality of opposite first ends and a plurality of second ends, and the plurality of first ends and the plurality of second ends are respectively connected by the plurality of memory alloy wires.

4. The variable aperture according to claim 3, characterized in that: N is an even number.

5. The variable aperture according to claim 3, characterized in that: n is less than or equal to N / 2.

6. The variable aperture according to claim 3, characterized in that: Each of the diamond structures is suitable for generating a length expansion and contraction ΔM, ΔM=2*d*Sr*tanθ, wherein d is the distance between the first end and the second end of each of the diamond structures, Sr is the expansion and contraction rate of the plurality of memory alloy wires, and θ is half of the inner angle of each of the diamond structures at the first end and the second end. When each of the diamond structures generates the length expansion and contraction ΔM, the length expansion and contraction of the elastomer is ΔL, and ΔL=n*ΔM.

7. The variable aperture according to claim 3, characterized in that: By stretching and retracting the plurality of memory alloy wires, the length of the elastic body changes, the distances between the plurality of first ends and the plurality of second ends of the n diamond structures change, and the plurality of third ends and the plurality of fourth ends of the n diamond structures move.

8. The variable aperture according to claim 1, characterized in that: The elastic body and the connecting member are connected through the side hole of the fixing seat.

9. The variable aperture according to claim 1, characterized in that: The second end of the connecting member is rotatably connected to the rotating seat.

10. The variable aperture according to claim 1, characterized in that: When the length of the elastic body increases, the light-transmitting hole formed by the plurality of blades becomes smaller, wherein the light-transmitting hole communicates with the space in the rotating seat.

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