JPH0569741U - Shutter mechanism - Google Patents

Abstract

(57) [Summary] [Object] To provide a shutter mechanism capable of increasing the shutter speed and improving the durability. [Structure] Three shutter blades 12 to 14 are rotatably supported by a rotating shaft 15 around an aperture window 11, and the shutter blades 12 to 1 are centered on each rotating shaft 15.
In the shutter mechanism that rotates 4 to open and close the aperture window 11, the drive lever 16 that rotates the first shutter blade 12 and the operation of the first shutter blade 12 that is rotated by the drive lever 16 Link members 18 and 21 that rotate the second and third shutter blades 13 and 14 in conjunction with each other are provided, and when the first shutter blade 12 is rotated by the operation of the drive lever 16, the first shutter blade 12 is rotated. Since the link members 18 and 21 move the second and third shutter blades 13 and 14 in the same manner in conjunction with the blade 12, all the shutter blades 12 to 1 in response to the operation of the drive lever 16.
4 simultaneously rotate to open and close the aperture window 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shutter mechanism used in a camera.

[0002]

[Prior Art]

 Conventionally, a focal plane shutter is suitable as a shutter that needs to be driven at a high speed, but because of its complicated structure, this shutter is unsuitable for electronic still cameras and compact cameras in terms of both size and cost. For this reason, recently, a lens shutter has been adopted in which a plurality of shutter blades are arranged around the aperture window and these shutter blades are rotated to open and close the aperture window.

In this lens shutter, for example, as shown in FIG. 3, an aperture window (circular hole) 2 is provided at the center of a circular base plate 1, and three base plates 1 are provided around the aperture window 2. The shutter blades 3 are rotatably attached by rotating shafts 4, and a rotating ring 5 is attached to the outer periphery of the base plate 1 in order to rotate the shutter blades 3 at the same time to open and close the aperture window 2. It is rotatably arranged, and has a structure in which a guide pin 6 provided on the rotating ring 5 is inserted into the long hole 7 of each shutter blade 3.

In this lens shutter, when the rotary ring 5 rotates counterclockwise (in the direction of arrow X) in FIG. 3, each guide pin 6 moves in the same direction, and each guide pin 6 causes each of the three sheets to move. The shutter blades 3 rotate counterclockwise (in the direction of arrow Y) about each rotation shaft 4, thereby closing the aperture window 2. Conversely, when the rotary ring 5 rotates in the opposite direction, each shatter blade 3 rotates in the opposite direction about each rotary shaft 4 this time, so that the aperture window 2 is opened as shown in FIG.

[0005]

However, in this conventional lens shutter, when the rotary ring 5 rotates and each shutter blade 3 rotates, the guide pin 6 provided on the rotary ring 5 rotates. 4 moves in the long hole 7 of the shutter blade 3 in accordance with a change in the distance from the shutter blade 3, so that friction occurs due to the sliding of the guide pin 6 with respect to the long hole 7, and this friction causes a change in shutter speed when the speed is increased. There is a problem that accuracy and durability are reduced. The present invention has been made in view of the above circumstances, and an object thereof is to provide a shutter mechanism capable of eliminating friction, increasing shutter speed, and improving durability.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention rotatably supports a plurality of shutter blades around an aperture window by rotating shafts, and rotates the plurality of shutter blades around each rotating shaft. In the shutter mechanism that opens and closes the aperture window, a drive lever that rotates one shutter blade of the plurality of shutter blades, and another shutter blade that operates in conjunction with the operation of one shutter blade that is rotated by this drive lever. And a link member for rotating all the shutter blades in the same manner.

[0007]

[Action]

 According to this invention, when one shutter blade is pivoted about the rotation axis by the operation of the drive lever, the link member interlocks with this shutter blade and causes all the other shutter blades to become one shutter blade. Since all shutter blades simultaneously rotate around their respective rotation axes in response to the operation of the drive lever, the aperture window is opened and closed. No friction will occur due to sliding of the guide pin.

[0008]

【Example】

 A first embodiment of the present invention will be described below with reference to FIGS. 1 (A) and 1 (B).

FIGS. 1A and 1B show a lens shutter, FIG. 1A shows an open state, and FIG. 1B shows a closed state. In these figures, 10 is a circular base plate. An aperture window 11 is provided at the center of the base plate 10. On the base plate 10 around the aperture window 11, three shutter blades 12, 13 and 14 are rotatably attached by a rotary shaft 15.

A drive lever 16 is rotatably attached to the rotary shaft 15 of the first shutter blade 12. The drive lever 16 is formed in a strip plate shape, and an intermediate portion thereof is connected to the first shutter blade 12 by a connecting pin 17. The other end of the drive lever 16 is driven by an actuator (not shown) to rotate about the rotary shaft 15 and rotate the first shutter blade 12.

The first shutter blade 12 and the second shutter blade 13 are connected by a first link member 18. The first link member 18 is formed in the shape of a strip plate that is curved so as to pass through the outside of the aperture window 11. One end of the first link member 18 is rotatably attached to the vicinity of the rotation shaft 15 of the first shutter blade 12 by a connecting pin 19, and the other end thereof is rotated by a connecting pin 20 to rotate the second shutter blade 13. It is rotatably attached near the shaft 15.

Further, the first shutter blade 12 and the third shutter blade 14 are connected by a second link member 21. The second link member 21 is formed in the shape of a strip plate that is curved so as to pass through the outside of the aperture window 11 like the first link member 18. One end of the second link member 21 is rotatably attached to the vicinity of the rotating shaft 15 of the first shutter blade 12 by a connecting pin 22, and the other end of the third shutter blade 14 is connected by a connecting pin 23. It is rotatably attached near the rotary shaft 15.

Next, the operation of such a lens shutter will be described. As shown in FIG. 1A, when the drive lever 16 is driven counterclockwise (direction of arrow P) by the actuator with the shutter open, the drive lever 16 rotates the first shutter blade 12. Since the first shutter blade 12 rotates about the shaft 15, the first shutter blade 12 rotates about the rotation shaft 15 in the counterclockwise direction (arrow Q direction). Then, the first and second ring members 18 and 21 drive the second and third shutter blades 13 and 14 in conjunction with the operation of the first shutter blade 12. That is, the first ring member 18 rotates the second shutter blade 13 in the counterclockwise direction (direction of arrow R) about the rotation shaft 15 in association with the operation of the first shutter blade 12. Further, the second ring member 21 rotates the third shutter blade 14 counterclockwise (direction of arrow S) about the rotation shaft 15 thereof in conjunction with the operation of the first shutter blade 12. As a result, as shown in FIG. 1B, the aperture window 11 is closed by the three shutter blades 12, 13 and 14.

As shown in FIG. 1B, when the drive lever 16 is driven by the actuator in the clockwise direction opposite to the above with the shutter closed, this time the first shutter blade is rotated. 12 rotates in the clockwise direction (direction opposite to the arrow Q direction) about the rotation shaft 15, and the first and second ring members 18, 21 move in the first and second ring members 18 and 21 in conjunction with the operation of the first shutter blade 12. When the second and third shutter blades 13 and 14 are driven, the second shutter blade 13 is rotated in the clockwise direction (direction opposite to the arrow R direction) about the rotation shaft 15 thereof, and The shutter blade 14 of No. 3 is rotated in the clockwise direction (direction opposite to the arrow S direction) about the rotation shaft 15 thereof, and as a result, returns to the original initial position shown in FIG. Is opened.

As described above, in this shutter mechanism, when the first shutter blade 12 is rotated about the rotation shaft 15 by the operation of the drive lever 16, the first shutter blade 12 interlocks with the first shutter blade 12. Since the link members 18 and 21 move the other two shutter blades 13 and 14, all the shutter blades 12, 13 and 14 simultaneously rotate about the respective rotary shafts 15 according to the operation of the drive lever 16, The aperture window 11 can be opened and closed. As a result, friction does not occur due to the sliding of the guide pin 6 with respect to the long hole 7 of the shutter blade 3 as in the conventional case, so that the accuracy of shutter speed and the durability can be improved when the speed is increased. .. Therefore, it can be used for electronic still cameras and compact cameras that require high speed, and since it does not use the conventional rotary ring 5 and has no friction, it can reduce the size of drive sources such as actuators and the entire device. It is possible to realize downsizing.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 (A) and 2 (B). The same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

Of the first, second, and third shutter blades 12, 13, and 14 arranged around the aperture window 11 of the base plate 10, the first shutter blade 12 has the above-described first embodiment. The drive lever 16 is attached similarly to. Further, the first shutter blade 12 and the second shutter blade 13 are connected by the first link member 18 as in the first embodiment described above. Further, the second shutter blade 13 and the third shutter blade 14 are connected by the second link member 30. Similar to the first link member 18, the second link member 30 is formed in a curved strip plate shape so as to pass through the outside of the aperture window 11. Then, one end of the second link member 30 is rotatably attached to the vicinity of the rotation shaft 15 of the second shutter blade 13 by the connecting pin 31, and the other end thereof is connected by the connecting pin 32 to the third shutter blade 14. It is rotatably attached near the rotary shaft 15.

In such a lens shutter, the first shutter blade 12 and the second shutter blade 13 and the second shutter blade 13 and the third shutter blade are formed by the first and second link members 18 and 30. Since the first shutter blades 12 are rotated about the rotation shaft 15 by the operation of the drive lever 16, the first link member 14 is linked with the first shutter blades 12. 18 drives the second shutter blade 13, the second shutter blade 13 rotates about the rotation shaft 15, and at the same time, the second link member 30 drives the third shutter blade 14. As a result, the third shutter blade 14 rotates about the rotary shaft 15, and as a result, all the shutter blades 12, 13, 14 are simultaneously rotated according to the operation of the drive lever 16 to open the aperture. The viewer window 11 can be opened and closed. Therefore, the lens shutter of the second embodiment also has the same effect as that of the first embodiment.

In each of the above-described embodiments, the three shutter blades 12, 13, and 14 are arranged around the aperture window 11 of the base plate 10, but not limited to this, two shutter blades, or It is also possible to arrange four or more shutter blades and connect adjacent shutter blades with a link member.

[0020]

[Effect of the device]

 As described above, according to the present invention, when one shutter blade is rotated around the rotation axis by the operation of the drive lever, the link member interlocks with the shutter blade and all other link members move. Since the shutter blades are moved in the same way as one shutter blade, all shutter blades can simultaneously rotate around their respective rotation axes according to the operation of the drive lever to open and close the aperture window. Since friction does not occur due to the sliding of the guide pin with respect to the long hole of the shutter blade, it is possible to improve the accuracy and durability of the shutter speed when the speed is increased, and therefore a higher speed is required. It can be favorably used for an electronic still camera and a compact camera used.

[Brief description of drawings]

FIG. 1 shows a first embodiment in which the present invention is applied to a lens shutter, (A) showing an open state, and (B) showing a closed state.

FIG. 2 shows a second embodiment, (A) shows an open state,
FIG. 6B is a diagram showing a closed state.

FIG. 3 is a diagram showing an open state of a conventional lens shutter.

[Explanation of symbols]

 10 Base plate 11 Aperture window 12, 13, 14 Shutter blade 15 Rotating shaft 16 Drive lever 18, 21, 30 Link member

Claims (1)

[Scope of utility model registration request] 1. A shutter mechanism for rotatably supporting a plurality of shutter blades around an aperture window by a rotating shaft, and rotating the shutter blades about the rotating shaft to open and close the aperture window. A drive lever for rotating one shutter blade among the plurality of shutter blades, and all other shutter blades are similarly rotated in conjunction with the operation of the one shutter blade rotated by the drive lever. A shutter mechanism comprising a link member.