TWI403820B - Dust cover device - Google Patents

Abstract

A dust cover device includes a base, two cover units set up oppositely in the base, a connecting rod, and a linking unit. Each cover unit has a swing arm hinged in the base in a swinging manner, and a dust cover rotatably connected with the swing arm. The connecting rod is rotatably installed in the base. An elastically movable unit has a first elastic element and two second elastic elements. The first elastic element is connected to the base and the connecting rod. Each second elastic element is connected to the connecting rod and swing arm of one of the cover units. In this way, when the connecting rod is rotated toward a direction in response to an external force, it would overcome the elastic force of the first elastic element, and involve the second elastic element to move the swing arm to simultaneously drive the dust cover, so that tops of the dust covers abut against each other and rotate to be closed firmly so as to shut off the opening.

Description

Dust cover device

The present invention relates to a dust cover device, and more particularly to a dust cover device that can be relatively separated and closed.

Generally, a "retractable lens" mainly includes a base, a fixed cylinder, a rotary cylinder, and at least one telescopic lens barrel disposed along an axis, and is generally at the front end of the lens barrel in order to prevent dust or foreign matter from being contaminated. It is equipped with a dust cover device that can be automatically opened and closed.

Referring to FIG. 1 and FIG. 2 , the dust cover device 1 includes a base 11 , two dust covers 12 , a rotating ring 13 and a spring unit 14 . The base 11 has an opening 111 extending along an axis, and two elongated holes 112 penetrating in the direction parallel to the axis and oppositely disposed on opposite sides of the opening 111. The dust caps 12 are relatively pivotally disposed on an outer surface 113 of the base 11. The rotating ring 13 is rotatably mounted on the inner surface 114 of the base 11 around the opening 111, and has two lugs 131 disposed in the long hole 112 of the base 11 and formed on the lug 131. And the two protrusions 132 of the dust cover 12 and the cam block 133 formed on an outer peripheral surface can be forced. The spring unit 14 has a first elastic member 141 that connects the inner surface 114 of the base 11 and the rotating ring 13 , and two second elastic members 142 that respectively connect one end of the dust cover 12 and the lug 131 of the rotating ring 13 . .

When the lens barrel (not shown) is contracted, as shown in FIG. 1, the cam block 133 of the swivel 13 is pushed by a member (not shown) in the telescopic lens to overcome the first elastic member 141. The elastic force rotates in a counterclockwise direction, whereby the lugs 131 are displaced according to the elongated holes 112 and are implicated The second elastic members 142 are closed to close the opening 111 by interlocking the dust caps 12 with each other. When the lens barrel (not shown) is extended, the rotating ring 13 is driven by the external force of the first elastic member 141 to rotate in a clockwise direction due to the loss of external force from the member (not shown) in the telescopic lens. And interlocking the protrusions 132 to push the dustproof covers 12 to separate and open the opening 111 to form the state of FIG.

However, since the rotating ring 13 is connected to the two dustproof covers 12 through the two second elastic members 142, when the dustproof covers 12 are closed, the elastic force of the second elastic members 142 may be different, or The degree of fatigue is different, or the error in dimensional accuracy, resulting in a lack of closure.

Accordingly, it is an object of the present invention to provide a dust cover device that can be reliably closed.

Therefore, the dust cover device of the present invention comprises a base, two cover units disposed opposite to the base, a link, and a linkage unit. The base has a first surface and a second surface disposed opposite each other, and an opening extending through the first and second surfaces along an axis. Each cover unit has a swing arm pivotably mounted on the first surface of the base, and a dust cover pivotally connected to the swing arm, the dust cover has a contact edge, and the dust cover The contact edges are facing each other. The connecting rod is rotatably mounted on the second surface of the base around the axis, and has two pushing portions extending in the axial direction and detachably respectively abutting the swing arms. The spring unit has a first elastic element and two second elastic elements, the first elastic element is coupled to the base and the connecting rod, and each second elastic element is coupled to the connecting rod and one of the connecting rods The swing arm of the cover unit, when the link is rotated by an external force in one direction, the second elastic members are coupled to the swing arms to simultaneously drive the dust caps, so that the dust caps are deflected against each other to close the opening When the external force is released, the returning elastic force of the first elastic element drives the connecting rod to rotate in the other direction, and the pushing portions respectively abut against the swinging arms to drive the dustproof cover to open the opening.

The effect of the present invention is that the dust caps can freely rotate on the swing arms, respectively, so that the deflection can be corrected by itself and the closure can be surely performed.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to FIG. 3, FIG. 4, and FIG. 5, a preferred embodiment of the dust cap device of the present invention is also mounted on a lens barrel (not shown) of a telescopic lens, and includes a base 2 disposed opposite to the base. 2, a cover unit 3, a link 4 and a spring unit 5.

The pedestal 2 has a first surface 21 and a second surface 22 disposed opposite to each other, an opening 23 extending through the first and second surfaces 21 and 22 along an axis, and extending through the first and second surfaces 21 a two-length hole 24 of the 22, a ring edge 25 formed on the second surface 22 and surrounding the opening 23, and two protrusions 26 formed on an outer circumferential surface of the ring edge 25, and along the second surface 22 A second convex portion 27 extending in the axial direction. In the preferred embodiment, the first surface 21 is toward the outside of the telescopic lens (not shown), and the second surface 22 is toward the inside. Each elongated hole 24 is bent and has one Inner ring segment 241 and an outer ring segment 242 communicating with the inner ring segment 241

Each of the cover units 3 has a swing arm 31 pivotably opposite to the first surface 21 of the base 2, and a dust cover 32 pivotally connected to the swing arm 31. The dust cover 32 is disposed on the dust cover 32. a pivot hole 33, and a pivot 34 disposed on the swing arm 31 and passing through the pivot hole 33, the dust cover 32 is deflected about the pivot 34. It is worth noting that the pivot hole 33 The pivot 34 can be disposed on the swing arm 31 and the dust cover 32 respectively, and thus the dust cover 32 can also be pivoted about the pivot 34. Each of the swing arms 31 has a pivoting section 311, a long arm section 313 extending from the pivoting section 311 and provided with one of the dustproof covers 32, and a connecting portion 314 extending from the pivoting section 311 in the axial direction. And spaced apart from the second limiting post 315 of the long arm section 313, the pivoting section 311 has a through hole 312. The dust cover 32 has a cover plate 321 disposed for the pivot hole 33, and a baffle 322 extending from the cover plate 321 and extending between the limit posts 315. Thus, the dust cover 32 can be restricted. Deflection angle. The cover 321 further has a linear contact edge 323. The contact edges 323 of the cover 321 of the two dust cover 31 are facing each other, and the connection line L of the pivot joints of the two dust covers 31 is simultaneously The two contact edges 323 meet.

In the preferred embodiment, the connecting rod 4 is a ring body surrounding the opening 23 of the base 2, and has two pushing portions 41 extending in the axial direction and detachably respectively abutting against the swinging arms 31. And two first convex portions 42 respectively extending from the outer ring segments 242 of the base 2, and two recessed grooves 43 formed on an inner peripheral surface and having an L shape, and extending from the outer peripheral surface away from the axial direction A hook portion 44 and a cam block 45 formed on the outer peripheral surface. The pushing parts 41 are respectively The inner ring segment 241 is worn. The slots 43 are respectively slidably engaged with the projections 26 such that the links 4 are rotatably mounted on the second surface 22 of the base 2 about the axis.

The spring unit 5 has a first elastic element 51 and two second elastic elements 52. The first elastic member 51 is coupled to the second protrusion 27 of the base 2 and the hook portion 44 of the link 4, and each of the second elastic members 52 is coupled to one of the first protrusion 42 and the cover unit 3 31.

Referring to FIG. 6 and FIG. 7, when the lens barrel (not shown) is contracted, the cam block 45 of the connecting rod 4 is pushed by a member (not shown) inside the telescopic lens, so that the connecting rod 4 overcomes the first The elastic force of an elastic member 51 is rotated counterclockwise (as viewed in FIG. 6), and the pushing portions 41 are respectively disengaged from the swing arms 31 of the covering units 3, and at the same time by the second elastic members 52 pivotally pivots the pivoting segments 311 of the swing arms 31 such that the contact edges 323 of the dust caps 32 are deflected against each other to close to close the opening 23.

Referring to FIG. 8, when the second elastic members 52 are caused by the uneven elastic force, the pivot angles of the pivotal sections 311 are insufficient (the swing arm 31 in the left side of the figure) and the swing (the swing on the right in the figure). In the case of the arm 31), since the dust caps 32 can be pivoted relative to the swing arms 31, respectively, the dust caps 32 can still be deflected to close to each other to close the opening 23.

Referring to FIG. 4 and FIG. 5, when the lens barrel (not shown) is extended, the cam block 45 of the connecting rod 4 is pushed by the external member (not shown) of the telescopic lens to be driven by the external force. The return elastic force of the elastic member 51 is rotated in the counterclockwise direction (viewed in FIG. 5), and the pivoting portions 311 of the swing arm 31 are respectively rotated by the pushing portions 41 to make the dustproof cover 32. The opening 23 is opened by relative separation.

Referring to FIG. 9 and FIG. 10, if foreign matter is stuck between the cover plates 321 of the cover units 3, or if an external force prevents the cover plates 321 from being closed, the second elastic members 52 can be provided. The elastic margin and the movable space formed by the elongated holes 24 of the base 2 enable the link 4 to be separately rotated and simultaneously stretched by the first convex portions 42 at the same time. The second elastic member 52, after the foreign matter or the external force is removed, pulls the pivoting portion 311 of the swing arm 31 by the returning elastic force of the second elastic member 52, so that the dustproof covers 32 abut each other. The opening 23 is closed by being deflected to close, whereby the dust caps 32 are provided with a springing effect to avoid damage.

It is worth mentioning that the shape of the connecting rod 4 is not limited to the closed ring body, for example, it is modified to an open C shape, and the same effect can be achieved.

In summary, since the dust caps 32 of the cover units 3 can be freely rotated on the swing arms 31, respectively, when the dust covers 32 are engaged, even if the contact edges 323 are not parallel, the cover plates can be used. The 321 itself is deflected against each other to correct the contact edge 323 to be parallel, and thus is surely closed, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2‧‧‧Base

21‧‧‧ first surface

22‧‧‧ second surface

23‧‧‧ openings

24‧‧‧ long hole

241‧‧‧ inner circle

242‧‧‧ outer circle

25‧‧‧ rim

26‧‧‧Bumps

27‧‧‧second convex

3‧‧‧ Covering unit

31‧‧‧ swing arm

311‧‧‧ pivot section

312‧‧‧Perforation

313‧‧‧Long arm section

314‧‧‧ Linkage Department

315‧‧‧Limited column

32‧‧‧Dust cover

321‧‧‧ cover

322‧‧ ‧ baffle

323‧‧‧Contact edge

33‧‧‧ pivot hole

34‧‧‧ pivot

4‧‧‧ Connecting rod

41‧‧‧Pushing Department

42‧‧‧First convex

43‧‧‧Inlay

44‧‧‧ hook

45‧‧‧ cam block

5‧‧‧Bounce unit

51‧‧‧First elastic element

52‧‧‧Second elastic element

L‧‧‧ connection

Figure 1 is a bottom view showing the case where the general dust cover device is closed; 2 is a top plan view showing a general dust cover device opening; FIG. 3 is an exploded perspective view showing a preferred embodiment of the dust cover device of the present invention; FIG. 4 is a perspective assembled view showing the preferred embodiment 5 is a top view illustrating the opening of the preferred embodiment; FIG. 6 is a bottom view illustrating the closed state of the preferred embodiment; and FIG. 7 is a top view illustrating the closed state of the preferred embodiment; 8 is a top view illustrating the closed state when the two swing arms of the preferred embodiment are not normally in position; FIG. 9 is a bottom view illustrating the half-opening of the preferred embodiment; and FIG. 10 is a top view illustrating the comparison The case where the preferred embodiment is half open.

2‧‧‧Base

23‧‧‧ openings

241‧‧‧ inner circle

242‧‧‧ outer circle

3‧‧‧ Covering unit

31‧‧‧ swing arm

315‧‧‧Limited column

32‧‧‧Dust cover

321‧‧‧ cover

322‧‧ ‧ baffle

323‧‧‧Contact edge

41‧‧‧Pushing Department

42‧‧‧First convex

52‧‧‧Second elastic element

L‧‧‧ connection

Claims (11)

A dust cover device comprising: a base having a first surface and a second surface disposed opposite to each other; and an opening extending through the first and second surfaces along an axis; the two cover units are oppositely disposed on The pedestal unit has a swing arm pivotably mounted on the first surface of the base, and a dust cover pivotally connected to the swing arm, the dust cover having a contact edge The contact edges of the two dustproof covers are facing each other; a connecting rod is rotatably mounted on the second surface of the base around the axis, and has a direction extending along the axis and detachably respectively a second pushing portion abutting the swing arm; and a spring unit having a first elastic member and two second elastic members, the first elastic member connecting the base and the connecting rod, each second The elastic element is a swing arm connecting the connecting rod and one of the covering units. When the connecting rod is rotated by an external force in one direction, the second elastic elements are coupled to the swinging arms to simultaneously drive the dustproof cover, so that the dustproof cover The dust caps are deflected against each other to close the opening when the When the force is released, the return force of the first resilient member will drive the other direction of rotation of the link, and to push against such abutting portions of such entrainment arm openings such that the dust cover open. According to the dust cover device of claim 1, wherein the contact edge of the dust cover of each cover unit is linear, and the pivot point connection of the two dust covers simultaneously meets the two contact edges. According to the dust cover device of claim 2, wherein each The cover unit further has a pivot hole and a pivot shaft. The pivot hole is disposed on one of the swing arm and the dust cover. The pivot shaft is disposed through the pivot hole and disposed on the swing arm and the dust cover. Alternatively, the dust cover is deflected about the pivot. The dust cap device of claim 3, wherein the pivot hole is disposed on the dust cover, and the pivot shaft is disposed on the swing arm. The dust cover device of claim 4, wherein the swing arm has two spaced-apart columns, the dust cover has a cover plate for the pivot hole, and the cover plate extends and wears A baffle extending between the limit posts, the contact edge being formed on the cover. The dust cover device of claim 2, wherein the base further has a two-axis column formed on the first surface, each swing arm has a pivoting section, and is extended by the pivoting section And a long arm section provided by one of the dustproof covers, the pivoting section has a through hole for one of the shaft columns to pass, so that the swing arm swings around the shaft column. The dust cover device of claim 6, wherein the base further has two elongated holes extending through the first and second surfaces, and the swing arms are further provided by the pivotal segments respectively The two connecting portions extending in the axial direction, the pushing portions of the connecting rod respectively extend through the elongated holes, and further have two first convex portions respectively extending through the elongated holes, each of The second elastic element is coupled to one of the first convex portion and the joint portion. The dust cap device of claim 7, wherein each of the elongated holes is bent and extends, and has an inner ring segment for one of the pushing portions to extend, and is connected to the inner ring segment. And for one of the first convex portions to penetrate An outer circle segment. The dust cover device of claim 2, wherein the base further has a ring edge formed on the second surface and surrounding the opening, and two protrusions formed on an outer peripheral surface of the ring edge. The connecting rod has two recessed grooves formed in an L shape opposite to an inner peripheral surface, and the engaging grooves are respectively slidably engaged with the convex blocks. The dust cover device of claim 9, wherein the base further has a second protrusion extending from the second surface in the axial direction, the link further having the outer peripheral surface away from the a hook portion extending in the axial direction, the first elastic member connecting the second convex portion and the hook portion. The dust cap device of claim 10, wherein the connecting rod is formed in a ring shape around the opening.