JP2544329Y2 - Lens barrier device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a barrier device for opening and closing a lens opening at the front of a lens barrel.

"Prior art and its problems" In recent compact cameras, a type having a built-in barrier device for opening and closing a lens opening has become common. This barrier device basically moves one or several barrier plates into and out of the lens opening in conjunction with the transition of the photographing lens from the retracted state to the photographable state.

The number of barrier plates can be one or two if there is sufficient storage space when retracting from the lens opening. However, recent compact cameras are becoming smaller as a whole and the lens aperture is becoming larger, which makes it difficult to secure a storage space for the barrier plate.
Against this background, cameras that open and close a lens opening using four barrier plates are already on the market. However, this barrier device has a complicated structure because two of the four barrier plates move in parallel and the other two rotate around the axis.

Further, this conventional barrier device manually performs the opening / closing operation, and it is difficult to automatically perform the opening / closing operation according to the movement of the lens (for example, movement between the stored state and the use state). there were.

[Purpose of the Invention] The present invention aims to solve the problems of the conventional barrier device, and to obtain a lens barrier device having a small storage space and a simple structure. Another object of the present invention is to provide a barrier device that can be easily opened and closed automatically.

"Outline of the Invention" The present invention has been made on the basis that the storage space can be reduced if the barrier plates for opening and closing the lens openings are stored in a stacked state outside the lens openings.

That is, in the present invention, in a lens barrier device that opens and closes a lens opening of a lens barrel with a plurality of barrier plates, a plurality of lenses are arranged on each side substantially symmetrically with respect to the center of the lens opening, and mutually disposed outside the lens opening. A plurality of barrier plates movably supported in a storage position in which the lens opening is opened to be stacked and a closed position in which the lens opening is advanced into the lens opening and substantially half of the lens opening is closed; A driving plate rotatably supported around the optical axis, and receiving the rotational movement of the driving plate, to linearly move the barrier plates on each side, and interlock with the movement of the barrier plates to And an interlocking part for moving the barrier plate straight.

According to this barrier device, the barrier plates are stacked and stored in the open state of the lens opening, so that the storage space can be reduced, and therefore, it is possible to meet both demands for downsizing the entire camera and increasing the lens opening.

Therefore, theoretically, the larger the number of barrier plates, the smaller the storage area. However, in the current compact camera, a space such as a shutter block must be secured on the outer periphery of the lens diameter, and if the barrier plate is accommodated in this space, the object can be achieved.

In consideration of such circumstances, at this stage, if a pair of barrier plates are provided symmetrically with respect to the center of the lens opening, the storage space can be sufficiently reduced. More specifically, the present invention more specifically relates to a lens barrier device that opens and closes a lens opening of a lens barrel with a plurality of barrier plates, and symmetrically shifts each position in the plate thickness direction with respect to the center of the lens opening to form a pair. First and second barrier plates are provided, and the pair of first barrier plates are supported so as to be able to move linearly from a closed position in contact at the center of the lens opening to a storage position retracted to the outside of the lens opening, The pair of second barrier plates are linked to the movement of the pair of first barrier plates, and the storage position stacked outside the lens opening and the lens opening are cooperated with the first barrier plate. A drive plate is supported so as to be able to move straight ahead at a closed position to be closed, and is rotatable around the optical axis. The drive plate and the pair of first barrier plates are provided on the drive plate and the pair of first barrier plates by rotational movement of the drive plate. First Providing the interlocking portion for linearly moving the rear plate, respectively, it is characterized in.

As an interlocking mechanism of the first and second barrier plates and a sliding guide mechanism thereof, a key projection in a sliding direction is provided on the first barrier plate, and the key projection is fitted on the second barrier plate. An interlocking elongated hole in the sliding direction is provided,
It is preferable to fit in a sliding direction regulating groove formed in a lens frame having a lens opening.

If the sliding direction of the first and second barrier plates is parallel to the short side of the rectangular lens opening, the lens opening can be opened and closed efficiently with a small barrier plate.

Further, the barrier device is provided with two barrier plates that slide between a closed position where the lens opening of the lens barrel is closed and an open position where the lens opening is opened, and are overlapped with each other in the closed position. In a portion outside the opening, one end portion is rotatably supported by an axis parallel to the optical axis, and a pair of drive levers whose cross portions are connected so as to rotate in conjunction with each other in opposite directions, The end of the drive lever is connected to the one barrier plate, and the rotational movement of the pair of drive levers is transmitted as the linear movement of the one barrier plate to move the one barrier plate to the closed position and the open position. An interlocking part for linearly moving the driving lever, a driving member for rotatably driving at least one of the driving levers, the driving member being rotatable around the optical axis, an end of the pair of driving levers, and the one barrier plate And an interlocking unit that transmits the rotational motion of the pair of drive levers as the linear motion of the one barrier plate to linearly move the one barrier plate between the closed position and the open position; and the other barrier. A guide member that guides the linear movement slidably around the both ends of the plate at positions outside the lens opening, and the one barrier plate provided on the two barrier plates slides from the closed position to the open position. An open abutting portion that abuts on the way and moves the other barrier plate together to the open position; and an abutting portion provided on the two barrier plates, while the one barrier plate slides from the open position to the closed position. And a closing abutment portion that contacts and slides the other barrier plate together to the closed position.

According to this configuration, the two barrier plates that slide to move to the closed position and the open position are used to drive the other barrier plate using one of the barrier plates as a motor node, and one of the blades is driven by a barrier plate driving mechanism. , And the other barrier plate is slidably supported at both ends, so that the barrier plate does not tilt or malfunction. Further, since the barrier plates overlap in the open position, the storage space is small.

If two sets of the barrier plate and the barrier plate drive mechanism are provided symmetrically with respect to the optical axis, and one of the barrier plates abuts at the closed position, it can be housed in a more compact space.

"Embodiments of the invention" The invention will be described below based on illustrated embodiments. The lens decoration frame (lens barrel) 11 located at the forefront of the lens barrel has a substantially rectangular lens opening 11a formed at the center thereof. On the back of the lens decoration frame 11, a lens opening 11a is provided.
A pair of sliding direction restricting grooves 11b is formed in parallel with the short side of. On the back surface of the lens decoration frame 11, the first and second barrier plates 12, 13 are housed, and the sliding direction regulating groove 11b is provided.
At the same time, a step (projection) 11c for regulating the movement is formed.

The first barrier plate 12 and the second barrier plate 13 are provided in a pair, and are respectively provided with opening / closing portions 12a, 13a extending in parallel with the long side of the lens opening 11a, and continuous with the opening / closing portions 12a, 13a.
Drive guide portions 12b and 13b extend to opposite short sides of the lens opening 11a. The first and second barrier plates 12 and 13 can be stacked on each other, and can be stored outside the lens opening 11a of the lens decoration frame 11 in the stacked state (second
Figure).

A key projection 12c and an interlocking pin 12d are integrally provided on the opening / closing portion 12a of the first barrier plate 12 on the front and back thereof. In the opening / closing portion 13a of the second barrier plate 13, an interlocking long hole 13c into which the key projection 12c fits is formed. The interlocking slot 13c is
When the first and second barrier plates 12 and 13 are completely overlapped, the first and second barrier plates 1 and 2 abut against one end of the key projection 12c,
When the two and 13 are aligned (the ends are partially overlapped), they come into contact with the other end of the key projection 12c.

The key projection 12c extends from the interlocking elongated hole 13c to the sliding direction regulating groove 11b.
The sliding direction of the first and second barrier plates 12 and 13 is restricted by these fitting relationships. The first and second barrier plates 12 and 13 are provided with a lens decoration frame 11.
And the supporting plate 15 fixed to the stepped portion 11c of the lens decoration frame 11 with fixing screws 15a.

An annular driving plate 16 is inserted into the lens decoration frame 11.
The driving plate 16 is formed with radially interlocking grooves 16a at two opposite positions in the radial direction. In this interlocking groove 16a,
The interlocking pin 12d of the first barrier plate 12 fits. The drive plate 16 integrally has a drive arm 16b in a direction parallel to the optical axis.

Therefore, when the driving plate 16 is rotationally driven, the pair of first barrier plates 12 contact and separate from each other along the sliding direction regulating groove 11b via the interlocking groove 16a and the interlocking pin 12d. Go straight forward and backward. Now, in a state where the first and second barrier plates 12 and 13 are stacked and housed outside the lens opening 11a as shown in FIG. 2, the interlocking pin 12d is moved in the direction of the arrow via the driving plate 16. Then, the pair of first barrier plates 12 move toward the center of the lens opening 11a.

In the initial stage of this movement, the key projection 12c moves within the interlocking slot 13c of the second barrier plate 13,
Does not move (it does not move by friction). When the key projection 12c reaches the end of the interlocking slot 13c, the second barrier plate
13 starts to move with this. When the opening / closing portions 12a of the pair of first barrier plates 12 abut at the center of the lens opening 11a, the opening / closing portions 13a of the second barrier plate 13 are aligned with the opening / closing portions 12a, and The space between the outside and the lens opening 11a is closed. Therefore, the first and second barrier plates 12 and 13 (opening and closing
The lens opening 11a is closed at a and 13a) (FIG. 3).

Conversely, from the state shown in FIG.
When 12d is moved in the direction of the arrow, a pair of first barrier plates 1
2 moves in a direction away from the center of the lens opening 11a. The key projection 12c of the first barrier plate 12 is initially
, The second barrier plate 13 does not move (it does not move by friction). First barrier plate
When 12 overlaps the second barrier plate 13 and the key projection 12c reaches the end of the interlocking elongated hole 13c, the second barrier plate 13 starts to move with it, and the first and second barrier plates 12, 13 Together, they move to a retracted position (storage position) outside the lens opening 11a (see FIG. 2).

The first barrier plate 12 may be driven by a manual lever, for example, but the drive plate 16 facilitates automatic opening and closing. That is, the above opening / closing operation can be performed with a slight rotation angle of the driving plate 16. In order to move the taking lens between the retracted position and the photographable position, rotation of the cam ring is normally required,
Automatic opening and closing can be performed by rotating the driving plate 16 by the cam ring.

Next, another embodiment will be described with reference to FIGS. 4 to 6. FIG.

In the barrier device of this embodiment, as shown in FIG. 6, a barrier block 22 is housed in a lens barrel 21 from the front end side (object side), and a drive ring 23 is mounted from the rear end side (camera body side).
Are stored and assembled.

The barrier block 22 includes a barrier support ring 24 and a lens decoration frame 27 fixed thereto as main fixing portions. Between the barrier support ring 24 and the lens decoration frame 27, four power transmission levers 25,.
A barrier holding plate 26 for rotatably holding 25 and a main barrier plate
28a, 28b, sub barrier plates 29a, 29b and main barrier plates 28a, 28b
Arm 30a, 30b, 31a, 31b for directly operating the
And

In the barrier support ring 24, recesses 32,... For rotatably holding the power transmission lever 25 are formed at four positions on the peripheral edge. The power transmission lever 25 includes a shaft portion 33 rotatably fitted in the concave portion 32, an arm portion 34 protruding from the outer peripheral surface of the shaft portion 33 across the diametrical direction, and a locking protrusion 34a. Arm 34 is driven ring 23
, And the locking projection 34a extends in the opposite direction. The arm portion 34 projects from the barrier support ring 24 toward the drive ring 23 in a state where the shaft portion 33 is housed in the concave portion 32 of the barrier support ring 24, and has a cam portion 35 provided on a peripheral portion of the drive ring 23. Cam surface 36
In sliding contact with

A torsion spring 51 is attached to each power transmission lever 25 to urge the arm portion 34 into sliding contact with the cam surface 36. In each torsion spring 51, the coil portion is fitted on a shaft (not shown) formed on the barrier support ring 24, and both whiskers are hung on the barrier support ring 24 and the arm portion 34, respectively.

Four holes 37 are formed in the barrier holding plate 26 so as to correspond to the shaft 33 of the power transmission lever 25.

One end of each drive arm 30a, 30b, 31a, 31b has a pin
38 is fixed. And each of these pins 38,
It is loosely fitted into a pin hole 39 formed in the power transmission lever 25 through a corresponding hole 37, and is rotatably pivotally supported. Therefore, each of the drive arms 30a, 30b, 31a, 31b freely rotates about the pin 38 with respect to the power transmission lever 25.

Each pin 38 is fitted with a torsion spring 52. Then, one beard of the torsion spring 52 is locked to the locking projection 34 of the power transmission lever 25, and the other beard is locked to the locking projection 53 formed on the drive arms 30a and 30b. Therefore, each power transmission lever 25 and drive arm 30
The a and 30b are connected via a torsion spring 52 and rotate integrally. Of course, the lower drive arms 31a and 31b are similarly configured.

Each drive arm 30a, 30b has an elongated
And one end is fixed to the tip of the pin 38, and the other end is crossed with the other drive arms 30a and 30b.
And pin 5 fixed at the intersection of one drive arm 30a
0 is an elongated hole 41 formed at the intersection of the other drive arm 30b.
It is attached to. The lower drive arm in FIG.
The upper drive arms 30a and 30b are symmetrical with respect to the upper drive arms 30a and 30b with respect to the optical axis.

Further, one of the drive arms 30a, 31a is provided with holes 42, 42 near the end opposite to the end to which the pin 38 is fixed, for connecting the main barrier plates 28a, 28b, respectively. The other drive arms 30b and 31b are provided with long holes 43 near the end opposite to the end to which the pin 38 is fixed.

The main barrier plates 28a, 28b are elongated trapezoidal plates. The upper main barrier plate 28a is provided with a pair of pins 44a, 44a, and one pin 44a is loosely fitted into the hole 42 of the drive arm 30a, and the other pin 44a is loosely fitted into the long hole 43 of the drive arm 30b. . Of course, the lower main barrier plate 28b is similarly provided with a pair of pins 44b, 44b, one of which is connected to the drive arm 31a.
, And the other is loosely fitted into the elongated hole 43 of the drive arm 31b. Reference numeral 45 in the drawing denotes a retaining ring for the pins 44a and 44b.

The height dimension hm of the main barrier plates 28a and 28b is a dimension hc obtained by subtracting 1/2 of the height of the opening 29 from the inner diameter radius of the lens decoration frame 27.
It is set smaller than.

Further, the auxiliary barrier plates 29a, 29b are slidably brought closer to the subject side by the plate thickness than the main barrier plates 28a, 28b.
Is arranged. The sub barrier plates 29a and 29b are plates having a narrow U-shape.

The auxiliary barrier plates 29a and 29b are provided with guide pins 46 at the center and both ends of the surface on the camera body side, and the outer surface (the surface on the main barrier plates 28a and 28b side) has an outer edge. The protruding edges 47a, 47b are formed along the outer periphery, and the protrusions 48, 48 are provided on both outer ends. The shapes of the inner edges of the protruding edges 46a and 46b correspond to the shapes of the upper edges of the main barrier plates 28a and 28b, as shown in FIGS. 5A and 5B. The protruding edges 47a and 47b constitute an open contact portion, and the projection 48 constitutes a closed contact portion.

The height hs at the center of the sub barrier plates 29a and 29b is set smaller than the dimension hc of the peripheral edge of the lens decoration frame 27.

The lens decoration frame 27 has a lens opening 29 in the center. A guide groove serving as an operation guide for the sub-barrier plates 29a and 29b is provided on a surface of the peripheral portion of the lens opening 29 on the side of the sub-barrier plates 29a and 29b.
50, ... are formed. The guide pins 46,... Of the sub barrier plates 29a, 29b respectively fit into the corresponding guide grooves 50,.

The lens decoration frame 27 is configured such that the main barrier plates 28a and 28b, the sub barrier plates 29a and 29b, and the drive arms 30a, 30b, 31a and 31b are accommodated in a space between the barrier press plate 26 and the barrier press plate 26. To the barrier support ring 24 from above.

Next, details of a combination state of the main barrier plate 48a and the drive arms 30a and 30b will be described with reference to FIG. FIG. 4 shows a combination of the upper main barrier plate 48a and the drive arms 30a and 30b.
9 in the closed position with the upper half closed.

The combination of the main barrier plate 48a and the drive arms 30a, 30b constitutes a limited chain mechanism, and one or both of the drive arms 30a, 30b is used as a driving node, and the main barrier plate 48a is used as a driven node,
The main barrier plate 28a can be driven by rotating one or both of the drive arms 30a and 30b, which are prime movers.

Specifically, when one of the drive arms 30a and 30b is rotated, the other drive arm 30
The b and 30a rotate at the same speed as the one drive arm 30a and 30b and in the opposite direction. Then, the line connecting the holes 42 and 43 does not change its inclination, and the pin 3 moves with the rotation of the drive arms 30a and 30b.
Move vertically to the line connecting 8, 38. This hole 4
The pins 44a provided on the main barrier plate 28a are fitted to the reference numerals 2 and 43, respectively, so that the rotation of the drive arms 30a and 30b causes the main barrier plate 28a to rotate.
28a also moves in a direction perpendicular to the line connecting the pins 38. In the relationship between the main barrier plate 28a and the sub barrier plate 29a,
The main barrier plate 28a serves as a drive joint, and the sub barrier plate 29a serves as a follower joint.

Since the holes 42 and 43 respectively move in a circular locus with the rotation of the drive arms 30a and 30b, the length between the holes 42 and 43 changes. Therefore, the pin 43a is slidable along the long hole 43 by using the hole 43 as a long hole, and the above change in length is absorbed by this sliding.

 Next, the overall operation of the above embodiment will be described.

When the drive ring 23 is rotated by the power of the camera body (not shown) or the operation force of the photographer, the arm 34 is moved to the cam surface of the cam 35.
It slides on 36 and is pushed along its contour, and the power transmission lever
25 rotates about the shaft 33 in the closing direction against the urging force of the torsion spring 51 or in the opening direction by the urging force of the torsion spring 51.

The rotation of the power transmission lever 25 is
The drive arms 30a and 30b are connected to each other through the 52, and the drive arms 30a and 30b rotate in the opposite directions to move the barrier plates 28 and 29 in the closed position or the open position, thereby opening the lens opening 29. Open and close.

The above is the outline of the operation of the barrier device.
First, the operation for opening the lens opening 49 will be described in more detail. The upper main barrier plate 28a and the sub barrier plate 29a will be described, but the lower main barrier plate 28b will be described.
The same applies to the operation of the sub barrier plate 29b.

When the drive arms 30a and 30b rotate in the direction of the arrow "open" in FIG. 4, the distal ends to which the main barrier plate 28a is connected rotate upward in the figure. Therefore, the drive arm 30
The main barrier plate 28a connected to the a and 30b via the pin 44a is lifted upward by the rotation of the drive arms 30a and 30b. That is, the main barrier plate 28a moves toward the open position.

When the main barrier plate 28a slides upward to some extent, the upper edge portion serving as an open contact portion of the main barrier plate 28a becomes the sub barrier plate 29a.
Hits the protruding edge 46a. Therefore, the sub-barrier plate 29a is lifted by the main barrier plate 28a, and is restrained by loose fit between the guide pin 46 and the guide groove 50 of the lens decoration frame 27, so that the guide groove is
Slide up vertically along 50.

Then, the lower edge 6 of the main barrier plate 28a and the sub barrier plate 29a
Main barrier plate 28a with 1 and 62 reaching outside lens opening 49
Of the main barrier plate 28a and the sub barrier plate 2
The lens opening 49 is housed on the upper peripheral back surface of the lens decoration frame 27 in a state in which the lens opening 9a overlaps (the state of FIG. 5B), and the lens opening 49 is completely opened.

Note that the drive ring 23 is configured such that the barrier plates 28a and 29a
Is controlled to stop after completely opening the. In this open state, the arm 34 is separated from the cam surface 36, and the barrier plates 28 and 29 are elastically held at the open position by the urging force of the torsion spring 51.

Next, an operation when the lens opening 49 is closed from the state of FIG. 5B will be described. When the drive arms 30a, 30b rotate in the direction of the arrow "closed" in FIG. 1, that is, downward in the figure, the main barrier plate 28a is pushed down with the rotation of the drive arms 30a, 30b. That is, the main barrier plate 28a slides toward the closed position. During the sliding movement, the lower edge serving as the closing contact portion of the main barrier plate 28a contacts the projection 28 serving as the closing contact portion of the sub-barrier plate 29a, and the sub-barrier plate 29a is moved in the open position direction (in the drawing). Down).

The opposing edges 61, 61 of the main barrier plates 28a, 28b abut, and the main barrier plate 28 and the sub barrier plate 29 are
Close and stop 49 completely (see Figure 5A). In this closed state, the barrier plates 28 and 29 are
It is held in the closed position by the biasing force of 52.

As described above, the barrier device of this embodiment includes the drive arm 30
The main barrier plate 28 is supported by the a and 30b and is slid linearly in a parallel state, and the sub-barrier plate 29 is linearly slid and moved using the main barrier plate 28 as a prime mover. There is no danger of inclining and not moving.

When the drive ring 23 rotates in the closing direction, the drive arm 30 rotates through the elastic force of the power transmission lever 25 and the torsion spring 52. Therefore, for example, the barrier plates 28 and 29 are prevented from moving in the closed position direction, and the drive arm
Even if 30 cannot be rotated, the power transmission lever 25, that is, the drive ring 23 can rotate while twisting the torsion spring 52.

On the other hand, when the drive ring 23 rotates in the opening direction, the power transmission lever 25 rotates by the urging force of the torsion spring 51. Therefore, even if the barrier plates 28 and 29 are prevented from moving in the opening direction, the drive ring 23 can rotate without receiving any external force.

Although the embodiments have been described with reference to the accompanying drawings, the shapes of the barrier plate driving arm and the barrier plate of the present invention are not limited thereto.

In the present embodiment, the main barrier plate 28 is supported and moved and guided by the drive arm. However, similarly to the sub barrier plate 29, the main barrier plate 28 is slidably supported on the lens decoration frame 27 by the guide pins and the guide grooves. Is also good. In this case, the hole 42 of the drive arm 30a is made to be a long hole like the long hole 43 of the other drive arm 30b.

In the present embodiment, the barrier plate is moved by rotating each of the pair of drive arms 30, but when one of the drive arms is rotated, the other drive arm also rotates in conjunction with the other.
The driving force may be transmitted to only one driving arm.

Although the barrier device of the present embodiment includes two pairs of the main barrier plate and the sub-barrier plate, the barrier device may include only two main barrier plates. Alternatively, the barrier device may include a pair of the main barrier plate and the sub-barrier plate. It may be constituted only by.

[Effects of the Invention] As described above, the lens barrier device of the present invention enables a plurality of barrier plates to be stacked, accommodates them outside the lens opening in a stacked state, and closes the lens opening in an aligned state. Since the barrier plate is driven by the rotary plate rotating around the optical axis or by rotating the drive ring into a linear motion, the barrier plate is driven linearly, so that the barrier can be stored in a small storage space, and the lens opening can be opened. Even if the size is increased, the entire camera does not increase in size due to the storage space of the barrier.

In addition, the barrier device of the present invention can secure the storage space for the barrier by effectively utilizing the space that is inevitably formed on the outer peripheral portion of the lens opening. Satisfactorily can meet the demand for miniaturization. In addition, the barrier plate can be reliably guided by a simple mechanism, and the opening and closing operation can be easily automated.

In the barrier device according to claim 8, a barrier plate driving mechanism is connected to each of the two barrier plates near both ends of one of the barrier plates, whereby the barrier device is slid to the holding and closing positions and the opening position. Since the other barrier plate is slidably guided at its end to the closed position and the open position, and one of the barrier plates is used as a driving node, and the other barrier plate is used as a driven node to slide the barrier plate,
Both barrier plates can be moved smoothly and reliably. In addition, since the storage space of the barrier plate at the open position is small, it can be provided in a compact lens barrel of a high-magnification zoom lens camera using a large-diameter lens.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the barrier device according to the invention of claim 1, FIG. 2 and FIG. 3 are rear views showing the barrier open state and the closed state of the embodiment, respectively. FIG. 4 is a conceptual diagram showing an embodiment of a barrier device according to still another invention, FIGS. 5A and 5B are conceptual diagrams showing the operation of the barrier plate of the embodiment, and FIG. FIG. 5B is a rear view showing a state where the lens opening is opened, and FIG. 5B is an exploded perspective view showing a camera lens barrier device using the barrier device shown in FIG. . 11 ... Lens decoration frame (lens barrel), 11a ... Lens opening, 11b ... Sliding direction regulating groove, 12 ... First barrier plate, 1
3 ... second barrier plate, 12a, 13a ... opening / closing part, 12b, 13b
… Driving guide, 12c… Key protrusion, 12d… Link pin,
13c ... Linked long hole, 15 ... Support plate, 16 ... Drive plate, 16a ...
... Link groove, 16b ... Drive arm, 21 ... Barrel, 22 ... Barrier block, 23 ... Drive ring, 24 ... Barrier support ring, 25
… Power transmission lever, 26… barrier press plate, 27… lens decoration frame, 28a, 28b… main barrier plate, 29a, 29b… sub barrier plate, 30a, 30b, 31a, 31b… drive arm, 40 ... pin, 41 ... long hole, 42 ... hole, 43 ... long hole, 46a ... edge (open contact part of sub-barrier), 48 ... projection (close contact part of sub-barrier) , 49 ... Lens aperture

Claims (8)

(57) [Scope of request for utility model registration] In a lens barrier device for opening and closing a lens opening of a lens barrel by a plurality of barrier plates, a plurality of lenses are arranged on each side substantially symmetrically with respect to the center of the lens opening, and mutually disposed outside the lens opening. A plurality of barrier plates which are supported so as to be able to move linearly between a storage position where the lens opening is opened and a storage position where the lens opening is advanced into the lens opening and almost half of the lens opening is closed; A driving plate rotatably supported around the optical axis, and receiving the rotational movement of the driving plate, to linearly move the barrier plates on each side, and interlock with the movement of the barrier plates to A barrier device for a lens, comprising: an interlocking unit that moves a barrier plate straight. 2. A lens barrier device in which a lens opening of a lens barrel is opened and closed by a plurality of barrier plates, wherein a first and a second pair of first and second pairs are respectively symmetrically shifted in a plate thickness direction with respect to the center of the lens opening. And a pair of first barrier plates supported so as to be able to move straight from a closed position in contact with the center of the lens opening to a storage position retracted to the outside of the lens opening, and a pair of second barrier plates. A closing position for closing the lens opening in an aligned state in cooperation with the first barrier plate, in a storage position where the barrier plate is stacked outside the lens opening in conjunction with the movement of the pair of first barrier plates; A driving plate is provided so as to be able to move linearly at a position, and is rotatable around an optical axis. The driving plate and the pair of first barrier plates are provided on the pair of first barrier plates by rotating the driving plate. Barrier board Providing the interlocking portion for respectively straight movement, the lens barrier device according to claim. 3. The interlocking portion according to claim 2, wherein the interlocking portion is provided on one of an outer peripheral portion of the driving plate and one end portion of the first barrier plate, and is provided on the other. A barrier device for a lens, characterized in that the interlocking pin fits into the interlocking groove. 4. The device according to claim 2, wherein the first barrier plate is provided with a key projection at one end of a surface facing the second barrier plate. An interlocking elongated hole in which the key projection is slidably fitted and which extends in parallel with the direction of linear movement is provided, and the key projection and the interlocking elongated hole are arranged such that the first barrier plate has a closed position and a storage position. Wherein the second barrier plate is interlockedly moved between the closed position and the storage position in the process of moving between the second barrier plate and the second barrier plate. 5. The first and second key projections according to claim 4, wherein the key projection penetrates the interlocking elongated hole and fits in a sliding direction regulating groove formed in the lens barrel having the lens opening.
A lens barrier device that guides the barrier plate straight. 6. In any one of claims 2 to 5,
The sliding direction of the first and second barrier plates is a direction parallel to the short side of the rectangular lens opening. 7. A barrier device comprising two barrier plates that slide between a closed position for closing a lens opening of a lens barrel and an open position for opening and that overlap in the open position, wherein the barrier devices are arranged in an X-shape. In a portion outside the lens opening, one end portion is rotatably supported by an axis parallel to the optical axis, and a pair of drive levers whose cross portions are connected so as to rotate in conjunction with each other in opposite directions, The other end of the pair of drive levers is connected to the one barrier plate, and the rotational movement of the pair of drive levers is transmitted as the linear movement of the one barrier plate to move the one barrier plate to the closed position. And an interlocking part that moves straight to the open position, a driving member that rotates at least one of the driving levers and is rotatably turned around the optical axis, and the vicinity of both ends of the other barrier plate. A guide member slidably and linearly guided at a position outside the lens opening, and the other barrier plate provided on the two barrier plates abuts on the other side while sliding from the closed position to the open position. An open contact portion for moving the barrier plates together to an open position, and the other barrier provided on the two barrier plates, wherein one of the barrier plates abuts while sliding from the open position to the closed position. A lens abutment for sliding the plate to its closed position. 8. The two barrier plates and the pair of drive levers according to claim 7 are provided symmetrically with respect to the optical axis.
In the closed position, the edge portions of the one of the barrier plates opposing each other abut against each other.