Micro-channeling manual diaphragm

Abstract

The utility model discloses a micro-channeling manual diaphragm, which comprises a base and a driving ring, a light through hole is formed in the base, the driving ring is rotatably mounted in the light through hole, and a blade which is positioned below the driving ring and is driven by the driving ring is mounted in the light through hole; a limiting clamping ring is arranged at the opening position of the upper end of the light through hole in the upper end of the base, the edge of the inner end of the limiting clamping ring extends into the light through hole, a blocking shoulder is arranged on the inner wall of the light through hole, and the driving ring is located between the limiting clamping ring and the blocking shoulder. The upper surface of the driving ring is provided with an inclined face or a stepped face, the limiting clamping ring makes contact with and extrudes the inclined face or the stepped face of the driving ring, and the extrusion force F of all contact points, making contact with the driving ring, of the limiting clamping ring on the driving ring inclines downwards. And the extrusion force F is decomposed into an axial component force F1 facing downwards in the axis direction of the driving ring and a radial component force F2 facing inwards in the diameter direction of the driving ring. By means of the structural design, the hydraulic cylinder has the advantages of being novel in structural design, small in axial and radial movement amount and good in stability and reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragms, in particular to a micro-clearance manual diaphragm. Background Art

[0002] As an important mechanism of a lens, a diaphragm is mainly used to control the light passing through the optical system, so as to change the illuminance of the image plane and control the exposure time, thereby enabling the lens to obtain better clarity. Among them, diaphragms are widely used in industrial camera lenses and film and television camera lenses.

[0003] The Chinese utility model patent with the patent number: ZL202321554315.1 and the patent name: An adjustable diaphragm with high stability actually discloses a manual diaphragm; specifically, the adjustable diaphragm with high stability includes a diaphragm seat, a plurality of diaphragm blades, a diaphragm cover, a snap ring and an adjusting rod. The diaphragm seat is provided with a number of circular holes evenly distributed in a circumferential manner, a notch is provided on the side of the diaphragm seat, and a clamping groove is provided inside the diaphragm seat. The diaphragm cover is rotatably arranged inside the diaphragm seat, and a number of notches are provided on the diaphragm cover. The snap ring is located inside the clamping groove, and one side of the snap ring abuts against the diaphragm cover. The diaphragm blades are located between the diaphragm cover and the diaphragm seat, and fixing shafts are provided on both sides of the diaphragm blades. One end of the fixing shaft is rotatably arranged in the circular hole, and the other fixing shaft is slidably arranged in the notch. A convex ring is arranged inside the diaphragm seat, and a rubber anti-slip strip is fixed on the convex ring, and the rubber anti-slip strip abuts against the edge of the diaphragm cover.

[0004] For the above-mentioned adjustable diaphragm with high stability, during operation, the diaphragm cover is driven to rotate by the adjusting rod to adjust the position of the diaphragm blades, thereby adjusting the aperture size. Since the diaphragm cover is clamped by the snap ring and the rubber anti-slip strip, the frictional resistance received by the operator when rotating the diaphragm cover is greater, and the resistance to the rotation of the diaphragm cover is also greater, so as to improve the stability after the diaphragm is adjusted.

[0005] It should be noted that for the above-mentioned adjustable diaphragm with high stability, it has the following defects, specifically:

[0006] Defect 1: The anti-slip rubber strip and the snap ring cooperate to achieve the clamping and positioning of the diaphragm cover, so as to reduce the axial (vertical) runout of the diaphragm cover; and since the anti-slip rubber strip will gradually wear during the rotation of the diaphragm cover, and the aging of the anti-slip rubber strip itself will also accelerate the wear, the clamping force of the anti-slip rubber strip on the diaphragm cover becomes smaller or disappears after wear, which will cause it difficult for the anti-slip rubber strip to accurately clamp and position the diaphragm cover, thereby resulting in poor accuracy and stability of the diaphragm product;

[0007] Defect 2: The diaphragm cover is rotatably installed inside the diaphragm seat, that is, there is a certain gap between the diaphragm cover and the inner wall of the diaphragm seat. The existence of this gap will cause the diaphragm cover to have radial runout, which will also affect the accuracy and stability of the diaphragm product to become poor. Summary of the Invention

[0008] The purpose of the present utility model is to provide a micro-clearance manual diaphragm aiming at the deficiencies of the prior art. The micro-clearance manual diaphragm has a novel structural design, small axial and radial clearances, and good stability and reliability.

[0009] To achieve the above purpose, the present utility model is realized through the following technical solutions.

[0010] A micro-clearance manual diaphragm includes a base and a driving ring. A vertically penetrating light-passing hole is formed inside the base. The driving ring is rotatably installed in the light-passing hole, and a blade located below the driving ring and driven by the driving ring is installed in the light-passing hole.

[0011] A limiting snap ring is installed at the upper end of the base at the upper opening position of the light-passing hole. The inner edge of the limiting snap ring extends into the light-passing hole. A shoulder is provided on the inner wall of the light-passing hole. The driving ring is located between the limiting snap ring and the shoulder.

[0012] The upper surface of the driving ring has an inclined surface or a stepped surface, and the limiting snap ring contacts and presses the inclined surface or the stepped surface of the driving ring. The pressing force F of each contact point of the limiting snap ring in contact with the driving ring is inclined downward, and the pressing force F is decomposed into an axial component force F1 downward along the axis of the driving ring and a radial component force F2 inward along the diameter of the driving ring.

[0013] Wherein, the upper surface of the driving ring is a stepped surface, and a convex portion protruding upward is provided at the inner edge of the upper surface of the driving ring. The inner edge of the limiting snap ring contacts and presses the convex portion of the driving ring.

[0014] Wherein, the upper surface of the driving ring is provided with an inclined surface, and an elastic piece protruding downward is formed by stamping at the inner edge of the limiting snap ring. The elastic piece of the limiting snap ring contacts and presses the inclined surface of the driving ring.

[0015] Wherein, a circular groove is provided on the inner wall of the light-passing hole corresponding to the limiting snap ring, and the outer edge of the limiting snap ring is embedded in the circular groove.

[0016] Wherein, a rotation-stopping groove with an upward opening and communicating with the circular groove is provided at the upper end of the base. An outward protruding rotation-stopping portion is provided at the outer edge of the limiting snap ring. The rotation-stopping portion of the limiting snap ring is inserted into the rotation-stopping groove of the base.

[0017] Wherein, a downward protruding lower pivot shaft is provided at the fixed end of the blade, and an upward protruding upper pivot shaft is provided at the free end of the blade;

[0018] A convex ring protruding inward and in a circular ring shape is provided on the inner wall of the light-passing hole of the base. An upward opening lower pivot hole corresponding to the lower pivot shaft of the blade is provided on the convex ring. The lower pivot shaft of the blade is pivotally connected in the lower pivot hole of the convex ring.

[0019] The driving ring is provided with a sliding groove corresponding to the upper pivot of the blade, and the upper pivot of the blade is slidably installed in the sliding groove.

[0020] Wherein, a notch horizontally aligned with the driving ring is provided on the inner wall of the light passing hole of the base, the driving ring is screwed with a driving handle, and the driving handle passes through the notch of the base and extends to the outside of the base.

[0021] Compared with the prior art, the utility model has the following beneficial effects. Specifically, since the extrusion forces F of the contact points of the limit clamping ring on the driving ring will form an axial component force F1 and a radial component force F2, the axial component force F1 downward along the axis direction of the driving ring will keep the driving ring in a fixed state of always contacting the shoulder of the base axially, thereby reducing the axial movement amount of the driving ring; the radial component force F1 inward along the diameter direction of the driving ring will keep the driving ring coaxial with the base, and through the extrusion forces F of the limit clamping ring on multiple positions of the driving ring, the radial movement amount of the driving ring can be effectively reduced. Therefore, through the above structural design, the micro-movement manual diaphragm of the utility model has the advantages of novel structural design, small axial and radial movement amounts, and good stability and reliability. Description of the Drawings

[0022] The following uses the drawings to further illustrate the utility model, but the embodiments in the drawings do not constitute any limitation to the utility model.

[0023] Figure 1 It is a schematic structural diagram of the utility model.

[0024] Figure 2 It is an exploded schematic diagram of the utility model.

[0025] Figure 3 It is a schematic sectional view of the utility model.

[0026] Figure 4 It is a partial sectional schematic view of the utility model.

[0027] In Figures 1 to 4 it includes:

[0028] 1 - Base; 11 - Light passing hole; 12 - Shoulder; 13 - Annular clamping groove; 14 - Anti-rotation groove; 15 - Convex ring; 16 - Lower pivot hole; 17 - Notch; 2 - Driving ring; 21 - Convex part; 22 - Sliding groove; 3 - Blade; 31 - Lower pivot; 32 - Upper pivot; 4 - Limit clamping ring; 41 - Anti-rotation part; 5 - Driving handle. Specific Embodiments

[0029] The following combines specific embodiments to illustrate the utility model.

[0030] Embodiment 1, as Figures 1 to 4 shown, a micro-cursor manual diaphragm includes a base 1 and a driving ring 2. A vertically penetrating light passing hole 11 is formed inside the base 1. The driving ring 2 is rotatably installed in the light passing hole 11, and a blade 3 is installed in the light passing hole 11 below the driving ring 2 and driven by the driving ring 2. During operation, by manually rotating the driving ring 2 and making the driving ring 2 rotate in the light passing hole 11 of the base 1, the rotating driving ring 2 drives the blade 3 to rotate, thereby adjusting the amount of light passing through the light passing hole 11 of the base 1.

[0031] Among them, as Figures 1 to 4 shown, a limit retaining ring 4 is installed at the upper end opening position of the light passing hole 11 at the upper end of the base 1. The inner edge portion of the limit retaining ring 4 extends into the light passing hole 11. A shoulder 12 is provided on the inner wall of the light passing hole 11. The driving ring 2 is located between the limit retaining ring 4 and the shoulder 12. Specifically, an annular groove 13 is formed on the inner wall of the light passing hole 11 corresponding to the limit retaining ring 4, and the outer edge portion of the limit retaining ring 4 is embedded in the annular groove 13.

[0032] Furthermore, as Figures 2 to 4 shown, the upper surface of the driving ring 2 has an inclined surface or a stepped surface, and the limit retaining ring 4 contacts and presses the inclined surface or the stepped surface of the driving ring 2. The pressing force F of each contact point of the limit retaining ring 4 in contact with the driving ring 2 is inclined downward, and the pressing force F is decomposed into an axial component force F1 downward along the axis of the driving ring 2 and a radial component force F2 inward along the diameter of the driving ring 2.

[0033] It should be noted that the contact and pressing structure between the driving ring 2 and the limit retaining ring 4 in this Embodiment 1 can adopt the following two methods. Specifically:

[0034] Method 1: The upper surface of the driving ring 2 is a stepped surface, and a convex portion 21 protruding upward is provided at the inner edge portion of the upper surface of the driving ring 2. The inner edge portion of the limit retaining ring 4 contacts and presses the convex portion 21 of the driving ring 2. The lower surface of the driving ring 2 remains in contact with the shoulder 12 of the base 1, and the convex portion 21 of the driving ring 2 causes the inner edge portion of the limit retaining ring 4 to tilt upward. At this time, the entire limit retaining ring 4 is equivalent to a lever member, the outer edge portion of the limit retaining ring 4 is equivalent to the fulcrum, and the inner edge portion of the limit retaining ring 4 is equivalent to the acting end of the lever and presses downward on the convex portion 21 position of the upper surface of the driving ring 2;

[0035] Method 2: The upper surface of the driving ring 2 is provided with an inclined surface (not shown in the figure), and an elastic piece (not shown in the figure) protruding downward is formed by stamping at the inner edge portion of the limit retaining ring 4. The elastic piece of the limit retaining ring 4 contacts and presses the inclined surface of the driving ring 2.

[0036] It should be emphasized that since the extrusion forces F of the contact points of the limit retaining ring 4 on the driving ring 2 will form an axial component force F1 and a radial component force F2, the axial component force F1 downward along the axis of the driving ring 2 will keep the driving ring 2 in a fixed state of always contacting the shoulder 12 of the base 1 axially, thereby reducing the axial movement amount of the driving ring 2; the radial component force F1 inward along the diameter direction of the driving ring 2 will keep the driving ring 2 coaxial with the base 1, and through the action of the extrusion forces F of the limit retaining ring 4 on multiple positions of the driving ring 2, the radial movement amount of the driving ring 2 can be effectively reduced.

[0037] It should be further emphasized that since the first embodiment can effectively reduce the axial and radial movement amounts of the driving ring 2, that is, can effectively reduce the shaking during the rotation of the driving ring 2, the accuracy and stability of the diaphragm product can be effectively improved, and the consistency, earthquake resistance, anti-shake, and anti-external interference performance of the diaphragm product are better.

[0038] In addition, the first embodiment reduces the axial movement amount of the driving ring 2 through the extrusion force F of the limit retaining ring 4 on the driving ring 2. Compared with the prior art method of axially limiting the driving ring through rubber strips, the first embodiment will not have the problem of poor stability caused by the wear of the rubber strips, and has good stability and reliability.

[0039] Based on the above situation, through the above structural design, the micro-movement manual diaphragm of the first embodiment has the advantages of novel structural design, small axial and radial movement amounts, and good stability and reliability.

[0040] Embodiment 2, as Figures 1 to 3 shown, the difference between the second embodiment and the first embodiment is that: the upper end of the base 1 is provided with a rotation stopping groove 14 that opens upward and communicates with the annular card slot 13, and the outer edge of the limit retaining ring 4 is provided with a rotation stopping portion 41 protruding outward, and the rotation stopping portion 41 of the limit retaining ring 4 is inserted into the rotation stopping groove 14 of the base 1.

[0041] Through the cooperation of the rotation stopping portion 41 of the limit retaining ring 4 and the rotation stopping groove 14 of the base 1, the second embodiment can ensure that the limit retaining ring 4 is stably and reliably installed in the annular card slot 13 of the base 1.

[0042] Embodiment 3, as Figures 1 to 3 shown, the difference between the third embodiment and the first embodiment is that: the fixed end of the blade 3 is provided with a lower pivot shaft 31 protruding downward, and the free end of the blade 3 is provided with an upper pivot shaft 32 protruding upward.

[0043] Among them, the inner wall of the light passing hole 11 of the base 1 is provided with a convex ring 15 protruding inward and in a circular ring shape. The convex ring 15 is provided with a lower pivot connection hole 16 that opens upward corresponding to the lower pivot shaft 31 of the blade 3, and the lower pivot shaft 31 of the blade 3 is pivotally connected in the lower pivot connection hole 16 of the convex ring 15.

[0044] In addition, a sliding groove 22 is provided on the driving ring 2 corresponding to the upper pivot 32 of the blade 3, and the upper pivot 32 of the blade 3 is slidably installed in the sliding groove 22.

[0045] Embodiment 4, as Figures 1 to 3 shown, the difference between this Embodiment 4 and Embodiment 1 is that: a notch 17 horizontally aligned with the driving ring 2 is provided on the inner wall of the light passing hole 11 of the base 1, and a driving handle 5 is screwed on the driving ring 2. The driving handle 5 passes through the notch 17 of the base 1 and extends to the outside of the base 1.

[0046] The function of the driving handle 5 is to facilitate the manual rotation operation of the driving ring 2.

[0047] The above content is only the preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A micro-channel manual aperture, comprising a base (1) and a drive ring (2); a vertically penetrating light hole (11) is formed inside the base (1); the drive ring (2) is rotatably mounted in the light hole (11); and a blade (3) is mounted in the light hole (11) and is located below the drive ring (2) and driven by the drive ring (2); A limit clamp ring (4) is installed at the upper end of the base (1) at the upper opening position of the light-through hole (11); the inner edge of the limit clamp ring (4) extends into the light-through hole (11); a stop shoulder (12) is provided on the inner wall of the light-through hole (11); and the drive ring (2) is located between the limit clamp ring (4) and the stop shoulder (12); Features: The upper surface of the drive ring (2) has an inclined surface or a stepped surface, and the limiting clamp ring (4) contacts and squeezes the inclined surface or the stepped surface of the drive ring (2), and the contact points of the limiting clamp ring (4) with the drive ring (2) exert an extrusion force F on the drive ring (2) that is inclined downward, and the extrusion force F is decomposed into an axial force F1 that is downward along the axis of the drive ring (2) and a radial force F2 that is inward along the diameter of the drive ring (2).

2. A micro-shift manual diaphragm according to claim 1, characterized in that: The upper surface of the drive ring (2) is a stepped surface, and the inner edge of the upper surface of the drive ring (2) is provided with a convex portion (21) protruding upward, and the inner edge of the limit clamp (4) contacts and squeezes the convex portion (21) of the drive ring (2).

3. The micro-channel manual diaphragm according to claim 1, characterized in that: The upper surface of the driving ring (2) is provided with an inclined surface, and the inner edge of the limiting clamp ring (4) is stamped with a spring piece protruding downward, and the spring piece of the limiting clamp ring (4) contacts and squeezes the inclined surface of the driving ring (2).

4. The micro-shift manual diaphragm according to claim 1, characterized in that: An annular groove (13) is provided on the inner wall of the light-through hole (11) corresponding to the limiting clamping ring (4), and the outer edge of the limiting clamping ring (4) is embedded in the annular groove (13).

5. The micro-shift manual diaphragm according to claim 4, characterized in that: The upper end of the base (1) is provided with a rotation-stop groove (14) which opens upward and is connected to the annular clamping groove (13); the outer end edge of the limit clamping ring (4) is provided with a rotation-stop portion (41) which protrudes outward; the rotation-stop portion (41) of the limit clamping ring (4) is inserted into the rotation-stop groove (14) of the base (1).

6. The micro-shift manual diaphragm according to claim 1, characterized in that: The fixed end of the blade (3) is provided with a lower pivot (31) protruding downward, and the free end of the blade (3) is provided with an upper pivot (32) protruding upward; The inner wall of the light-through hole (11) of the base (1) is provided with a convex ring (15) protruding inwards and in the shape of a circular ring, the convex ring (15) is provided with a lower pivot hole (16) opening upwards corresponding to the lower pivot shaft (31) of the blade (3), and the lower pivot shaft (31) of the blade (3) is pivotally connected to the lower pivot hole (16) of the convex ring (15); The drive ring (2) is provided with a slide groove (22) corresponding to the upper pivot (32) of the blade (3), and the upper pivot (32) of the blade (3) is slidably mounted in the slide groove (22).

7. The micro-shift manual diaphragm according to claim 1, characterized in that: The base (1) is provided with a notch (17) on the inner wall of the light-through hole (11) which is horizontally aligned with the drive ring (2); the drive ring (2) is screwed with a drive handle (5); the drive handle (5) passes through the notch (17) of the base (1) and extends to the outside of the base (1).

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