Manual diaphragm

Abstract

The utility model discloses a manual diaphragm, which comprises a foundation base, a movable driving ring, a clamping ring and a plurality of blades, the foundation base comprises a base bottom and a base side wall, the movable driving ring is rotatably mounted on the inner side of the base side wall, and the plurality of blades are positioned between the movable driving ring and the base bottom; the clamping ring is clamped at the upper end of the side wall of the base and located on the upper side of the movable driving ring; a part of the outer circumferential surface of the movable driving ring is a driving ring first step surface, a part of the inner circumferential surface of the side wall of the base is a base first step surface, and the outer circumferential surface of the movable driving ring and the inner circumferential surface of the side wall of the base are in contact with the base first step surface only through the driving ring first step surface; a part of the upper surface of the movable driving ring is a driving ring second step surface, and the upper surface of the movable driving ring is in contact with the clamping ring only through the driving ring second step surface. By means of the structural design, the manual rotating mechanism has the advantages of being novel in structural design, low in noise during manual rotating operation and good in smoothness.

Description

Technical Field

[0001] The utility model relates to the technical field of optical structures, and particularly relates to a manual diaphragm. Background Art

[0002] As an important mechanism of a lens, a diaphragm is mainly used to control the light passing amount of an optical system, so as to change the illuminance of an 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 plurality 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 plurality 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 arranged 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. When adjusting the aperture size of the above-mentioned adjustable diaphragm with high stability, the diaphragm cover is driven to rotate through the adjusting rod to adjust the position of the diaphragm blades, thereby adjusting the aperture size.

[0004] It should be noted that for the above-mentioned adjustable diaphragm with high stability, it has the following defects, specifically:

[0005] Defect 1: The edge position of the upper surface of the diaphragm cover contacts and abuts against the snap ring, and the abutting contact between the two will generate a large frictional force. When manually rotating the diaphragm cover, the above frictional force will increase the noise and affect the smoothness of manually rotating and operating the diaphragm cover.

[0006] Defect 2: The contact area between the outer circumferential surface of the diaphragm cover and the inner circumferential surface of the diaphragm seat is large, which will also increase the frictional force between the diaphragm cover and the diaphragm seat. Similarly, when manually rotating the diaphragm cover, the above frictional force will increase the noise and affect the smoothness of manually rotating and operating the diaphragm cover. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a manual diaphragm aiming at the deficiencies of the prior art. The manual diaphragm has a novel structural design, low noise during manual rotation operation, and good smoothness.

[0008] To achieve the above object, the present utility model is realized by the following technical solutions.

[0009] A manual diaphragm includes a base base, a movable drive ring, a snap ring, and a plurality of blades. The base base includes a base bottom and a base side wall disposed at the edge of the base bottom and having a circular ring shape. The movable drive ring is rotatably installed inside the base side wall, and the plurality of blades are located between the movable drive ring and the base bottom;

[0010] The snap ring is fixedly installed at the upper end of the base side wall, and the snap ring is located above the movable drive ring;

[0011] Each blade has a fixed end and a free end. The fixed ends of the blades are respectively pivotally connected to the base bottom, and the free ends of the blades are respectively slidably connected to the movable drive ring;

[0012] The outer circumferential surface of the movable drive ring is a stepped surface, and a part of the outer circumferential surface of the movable drive ring is a first step surface of the drive ring; the inner circumferential surface of the base side wall is also a stepped surface, and a part of the inner circumferential surface of the base side wall is a first step surface of the base. The outer circumferential surface of the movable drive ring and the inner circumferential surface of the base side wall are in contact only through the first step surface of the drive ring and the first step surface of the base;

[0013] The upper surface of the movable drive ring is a stepped surface, and a part of the upper surface of the movable drive ring is a second step surface of the drive ring. The upper surface of the movable drive ring is in contact with the snap ring only through the second step surface of the drive ring.

[0014] Wherein, the inner circumferential surface of the base side wall is further provided with a second step surface of the base with the normal direction facing upward, and the edge part of the lower surface of the movable drive ring is in partial contact with the base step surface.

[0015] Wherein, a card slot is opened at the upper end of the inner circumferential surface of the base side wall, and the snap ring is embedded and fixed in the card slot of the base side wall;

[0016] A limiting notch communicating with the card slot is opened at the upper end of the base side wall. The snap ring is provided with a limiting convex part protruding outward corresponding to the limiting notch of the base side wall, and the limiting convex part of the snap ring is embedded in the limiting notch of the base side wall.

[0017] Wherein, free end rivets are respectively riveted and installed at the free ends of the blades, and fixed end rivets are respectively riveted and installed at the fixed ends of the blades;

[0018] The base bottom is respectively provided with bottom pivot holes corresponding to the fixed end rivets of the blades, and the fixed end rivets of the blades are respectively pivotally installed in the corresponding bottom pivot holes of the base bottom;

[0019] The movable driving ring is respectively provided with driving ring sliding grooves with inward openings corresponding to the free-end rivets of each blade, and the free-end rivets of each blade are respectively slidably installed in the corresponding driving ring sliding grooves.

[0020] Wherein, the movable driving ring is respectively provided with anti-detachment buckles at the inner-end opening positions of the driving ring sliding grooves.

[0021] Wherein, a concave fillet is provided at the position where the upper surface of the bottom of the base contacts the inner circumferential surface of the side wall of the base.

[0022] Compared with the prior art, the utility model has the following beneficial effects: specifically:

[0023] 1. Only the outer circumferential surface of the movable driving ring contacts the inner circumferential surface of the side wall of the base through the first step surface of the driving ring and the first step surface of the base. This contact method between the outer circumferential surface of the movable driving ring and the inner circumferential surface of the side wall of the base can effectively reduce the friction contact area between the two. During the process of manually rotating the movable driving ring to adjust the size of the light hole, the small-area contact method between the outer circumferential surface of the movable driving ring and the inner circumferential surface of the side wall of the base can reduce the noise during the rotation action of the movable driving ring, and can improve the smoothness and silkiness during the manual rotation operation;

[0024] 2. The movable driving ring is vertically limited and installed inside the side wall of the base through a snap ring. Since the upper surface of the movable driving ring is a stepped surface, and only the second step surface of the driving ring contacts the snap ring on the upper surface of the movable driving ring; this contact method between the movable driving ring and the snap ring can effectively reduce the friction contact area between the two. During the process of manually rotating the movable driving ring to adjust the size of the light hole, the small-area contact method between the movable driving ring and the snap ring can reduce the noise during the rotation action of the movable driving ring, and can improve the smoothness and silkiness during the manual rotation operation; l

[0025] 3. Therefore, the manual diaphragm of the utility model has the advantages of novel structural design, low noise during manual rotation operation and good smoothness and silkiness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 It is a schematic structural diagram of the utility model.

[0028] Figure 2 is Figure 1 exploded schematic diagram of.

[0029] Figure 3 It is a schematic structural diagram of another perspective of the utility model.

[0030] Figure 4 It is a partial cross-sectional schematic diagram of the utility model.

[0031] exist Figures 1 to 4 Included are:

[0032] 1-basic base; 11-bottom of base; 12-side wall of base; 13-first step surface of base; 14-second step surface of base; 15-slot; 16-limiting notch; 17-bottom pivot hole; 18-concave fillet; 2-movable drive ring; 21-first step surface of drive ring; 22-second step surface of drive ring; 23-drive ring slide groove; 24-anti-drop buckle; 3-snap ring; 31-limiting convex part; 4-blade; 41-free end rivet; 42-fixed end rivet. DETAILED DESCRIPTION

[0033] The present invention will be described below in conjunction with specific implementation methods.

[0034] Embodiment 1, as Figures 1 to 4 As shown, a manual aperture comprises a basic base 1, a movable driving ring 2, a retaining ring 3 and a plurality of blades 4, wherein the basic base 1 comprises a base bottom 11, a base side wall 12 which is arranged at the edge of the base bottom 11 and is in a circular ring shape, the movable driving ring 2 is rotatably installed on the inner side of the base side wall 12, and the plurality of blades 4 are located between the movable driving ring 2 and the base bottom 11.

[0035] Among them, Figures 1 to 4 As shown, the snap ring 3 is fixedly mounted on the upper end of the base side wall 12 , and the snap ring 3 is located on the upper side of the movable driving ring 2 .

[0036] Further, such as Figures 1 to 3 As shown, each blade 4 has a fixed end and a free end. The fixed end of each blade 4 is pivotally connected to the bottom 11 of the base, and the free end of each blade 4 is slidably connected to the movable driving ring 2.

[0037] Furthermore, if Figure 1 , Figure 2 as well as Figure 4 As shown, the outer circumferential surface of the movable driving ring 2 is a step surface, and a part of the outer circumferential surface of the movable driving ring 2 is the first step surface 21 of the driving ring; the inner circumferential surface of the base side wall 12 is also a step surface, and a part of the inner circumferential surface of the base side wall 12 is the first step surface 13 of the base, and the outer circumferential surface of the movable driving ring 2 and the inner circumferential surface of the base side wall 12 are in contact with the first step surface 13 of the base only through the first step surface 21 of the driving ring.

[0038] Also, if Figure 1 , Figure 2 as well as Figure 4As shown, the upper surface of the movable drive ring 2 is a stepped surface, and a part of the upper surface of the movable drive ring 2 is the second step surface 22 of the drive ring. The upper surface of the movable drive ring 2 is in contact with the snap ring 3 only through the second step surface 22 of the drive ring.

[0039] It should be noted that the outer circumferential surface of the movable drive ring 2 in the first embodiment is in contact with the inner circumferential surface of the base side wall 12 only through the first step surface 21 of the drive ring and the first step surface 13 of the base. The above contact method between the outer circumferential surface of the movable drive ring 2 and the inner circumferential surface of the base side wall 12 can effectively reduce the frictional contact area between the two. During the process of manually rotating the movable drive ring 2 to adjust the size of the light hole, the small-area contact method between the outer circumferential surface of the movable drive ring 2 and the inner circumferential surface of the base side wall 12 can reduce the noise during the rotation of the movable drive ring 2 and improve the smoothness during manual rotation operation.

[0040] In the first embodiment, the movable drive ring 2 is vertically limited and installed inside the base side wall 12 through the snap ring 3. Since the upper surface of the movable drive ring 2 is a stepped surface and the upper surface of the movable drive ring 2 is in contact with the snap ring 3 only through the second step surface 22 of the drive ring; the above contact method between the movable drive ring 2 and the snap ring 3 can effectively reduce the frictional contact area between the two. During the process of manually rotating the movable drive ring 2 to adjust the size of the light hole, the small-area contact method between the movable drive ring 2 and the snap ring 3 can reduce the noise during the rotation of the movable drive ring 2 and improve the smoothness during manual rotation operation.

[0041] Based on the above situation, through the above structural design, the manual diaphragm in the first embodiment has the advantages of novel structural design, low noise and good smoothness during manual rotation operation.

[0042] Embodiment 2, as Figure 2 and Figure 4 shown, the difference between the second embodiment and the first embodiment is that: the inner circumferential surface of the base side wall 12 is further provided with a second step surface 14 of the base with the normal direction facing upward, and the edge part of the lower surface of the movable drive ring 2 is in partial contact with the base step surface.

[0043] In the second embodiment, the lower surface of the movable drive ring 2 is limited by the second step surface 14 of the base to ensure that the movable drive ring 2 is accurately vertically limited between the snap ring 3 and the second step surface 14 of the base; since the edge part of the lower surface of the drive ring is in partial contact with the base step surface, this contact structure design can further reduce the noise during the rotation of the movable drive ring 2 and further improve the smoothness during manual rotation operation.

[0044] Embodiment 3, as Figures 1 to 4As shown in the figure, the difference between the third embodiment and the first embodiment is that the snap ring 3 in the third embodiment is fixedly installed on the side wall 12 of the base in the following manner. Specifically, a card slot 15 is provided at the upper end of the inner circumferential surface of the side wall 12 of the base, and the snap ring 3 is fixedly embedded in the card slot 15 of the side wall 12 of the base.

[0045] Among them, a limit notch 16 communicating with the card slot 15 is provided at the upper end of the side wall 12 of the base. The snap ring 3 is provided with an outwardly protruding limit convex portion 31 corresponding to the limit notch 16 of the side wall 12 of the base, and the limit convex portion 31 of the snap ring 3 is embedded in the limit notch 16 of the side wall 12 of the base.

[0046] Embodiment Four, as Figure 2 As shown in the figure, the difference between the fourth embodiment and the first embodiment is that the free ends and fixed ends of the respective blades 4 in the fourth embodiment are respectively connected to the corresponding bottom 11 of the base and the movable drive ring 2 in the following manner. Specifically, free-end rivets 41 are respectively riveted and installed at the free ends of the respective blades 4, and fixed-end rivets 42 are respectively riveted and installed at the fixed ends of the respective blades 4; bottom pivot holes 17 are respectively provided at the bottom 11 of the base corresponding to the fixed-end rivets 42 of the respective blades 4, and the fixed-end rivets 42 of the respective blades 4 are respectively pivotally installed in the corresponding bottom pivot holes 17 of the bottom 11 of the base; the movable drive ring 2 is respectively provided with drive ring chutes 23 with inward openings corresponding to the free-end rivets 41 of the respective blades 4, and the free-end rivets 41 of the respective blades 4 are respectively slidably installed in the corresponding drive ring chutes 23.

[0047] Embodiment Five, as Figures 1 to 3 As shown in the figure, the difference between the fifth embodiment and the fourth embodiment is that the movable drive ring 2 is respectively provided with anti-detachment buckles 24 at the inner end opening positions of the respective drive ring chutes 23.

[0048] For the anti-detachment buckle 24 of the fifth embodiment, it has the following functions. Specifically, when the blade 4 is subjected to an external force and undergoes extrusion deformation, the anti-detachment buckle 24 can effectively prevent the free-end rivet 41 at the free end of the blade 4 from slipping out of the corresponding chute, thereby effectively increasing the stable reliability of the installation of the blade 4.

[0049] Embodiment Six, as Figure 4 As shown in the figure, the difference between the sixth embodiment and the first embodiment is that an inner concave fillet 18 is provided at the position where the upper surface of the bottom 11 of the base contacts the inner circumferential surface of the side wall 12 of the base.

[0050] For the above-mentioned inner concave fillet 18, its function is to prevent the blade 4 from interfering with the basic base 1 during the rotation movement.

[0051] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A manual diaphragm, comprising a base (1), a movable drive ring (2), a clamping ring (3) and a plurality of blades (4), wherein the base (1) comprises a base bottom (11), a base side wall (12) arranged at the edge of the base bottom (11) and in a circular ring shape, the movable drive ring (2) being rotatably mounted on the inner side of the base side wall (12), and the plurality of blades (4) being located between the movable drive ring (2) and the base bottom (11); The clamping ring (3) is fixedly mounted on the upper end of the base side wall (12), and the clamping ring (3) is located on the upper side of the movable driving ring (2); Each blade (4) has a fixed end and a free end, the fixed end of each blade (4) is pivotally connected to the bottom of the base (11), and the free end of each blade (4) is slidably connected to the movable drive ring (2); Features: The outer circumferential surface of the movable drive ring (2) is a stepped surface, and a portion of the outer circumferential surface of the movable drive ring (2) is a first stepped surface (21) of the drive ring; the inner circumferential surface of the base side wall (12) is also a stepped surface, and a portion of the inner circumferential surface of the base side wall (12) is a first stepped surface (13) of the base; the outer circumferential surface of the movable drive ring (2) and the inner circumferential surface of the base side wall (12) are in contact with the first stepped surface (13) of the base only through the first stepped surface (21) of the drive ring; The upper surface of the movable drive ring (2) is a stepped surface, and a portion of the upper surface of the movable drive ring (2) is a drive ring second stepped surface (22), and the upper surface of the movable drive ring (2) is in contact with the clamping ring (3) only through the drive ring second stepped surface (22).

2. A manual diaphragm according to claim 1, characterized in that: The inner circumferential surface of the base side wall (12) is also provided with a second base step surface (14) with the normal direction facing upwards, and the edge portion of the lower surface of the movable drive ring (2) is partially in contact with the base step surface.

3. A manual diaphragm according to claim 1, characterized in that: A clamping groove (15) is provided at the upper end of the inner circumferential surface of the base side wall (12), and the clamping ring (3) is clamped and fixed in the clamping groove (15) of the base side wall (12); A limiting notch (16) communicating with the clamping groove (15) is provided at the upper end of the base side wall (12); the clamping ring (3) is provided with a limiting convex portion (31) protruding outwards corresponding to the limiting notch (16) of the base side wall (12); and the limiting convex portion (31) of the clamping ring (3) is embedded in the limiting notch (16) of the base side wall (12).

4. A manual diaphragm according to claim 1, characterized in that: The free end of each blade (4) is riveted and installed with a free end rivet (41), and the fixed end of each blade (4) is riveted and installed with a fixed end rivet (42); The bottom (11) of the base is provided with bottom pivot holes (17) corresponding to the fixed end rivets (42) of each blade (4), and the fixed end rivets (42) of each blade (4) are respectively pivotally mounted in the corresponding bottom pivot holes (17) of the bottom (11) of the base; The movable drive ring (2) is provided with a drive ring slide groove (23) opening inwardly corresponding to the free end rivet (41) of each blade (4), and the free end rivet (41) of each blade (4) is slidably mounted in the corresponding drive ring slide groove (23).

5. A manual diaphragm according to claim 4, characterized in that: The movable drive ring (2) is provided with an anti-drop undercut (24) at the inner end opening position of each drive ring slide groove (23).

6. A manual diaphragm according to claim 1, characterized in that: An indented fillet (18) is provided at a position where the upper surface of the base bottom (11) contacts the inner circumferential surface of the base side wall (12).

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