JP4740572B2 - Light amount adjusting device and optical apparatus - Google Patents

Description

  The present invention relates to a light amount adjusting device used in an optical apparatus such as a digital camera, and more particularly to a light amount adjusting device suitable as a shutter device.

  In an optical device (or a photographing device) such as a digital camera or a camera-equipped mobile phone, the need for mounting a mechanical shutter is increasing due to an increase in the number of pixels of an image sensor. Further, due to the miniaturization of the camera itself and the mounting of a high-magnification zoom lens, it is necessary to make the outer shape of the shutter device as small and thin as possible while keeping the total aperture diameter relatively large.

  As shown in FIG. 13, a typical conventional light amount adjusting device (shutter device) for a camera has two shutter blades 102 that rotate around fulcrums 106 and 107 so as to open and close the exposure opening 101. 103, and a drive pin 105 that engages with the elongated holes formed in the shutter blades 102 and 103 to operate the two shutter blades 102 and 103 in opposite directions.

  However, in such a light quantity adjusting device having a two-blade configuration, when the shutter blade is in a position retracted from the exposure opening, that is, when the shutter is fully opened, the width of the shutter blade is arranged on the outer periphery of the exposure opening. Therefore, there is a need for a retracting space for the shutter blades equal to or greater than that, and there is a limit to downsizing.

  As a method for solving this problem, the shutter blades are divided into three or more to reduce the area of each shutter blade, and when the shutter blades are fully opened, the plurality of blades are overlapped and retracted to reduce the retract space and reduce the size of the shutter device. It has been proposed that

For example, in the light amount adjusting device proposed in Patent Document 1, a plurality of shutter blades are operated by a ring member that rotates around the exposure opening. Further, in the light amount adjusting device proposed in Patent Document 2, two shutter blade groups that reciprocate in a group of two are used, and a total of four shutter blades can be rotated around a common fulcrum. In addition, the rotation amount (rotation angle) of each shutter blade is changed by controlling the rotation speed of each shutter blade by changing the shape of the cam groove formed on each shutter blade and engaging with the drive pin. . Furthermore, in the light quantity adjusting device proposed in Patent Document 3, the rotation angles of the shutter blades with respect to the operation amount of the drive pin are made different by disposing the rotation fulcrums of the four shutter blades at different positions. Accordingly, a plurality of shutter blades overlap each other when fully opened.
Japanese Utility Model Publication No. 02-121730 (Utility Model Registration Request, Fig. 1 etc.) Japanese Utility Model Publication No. 64-004421 (Utility Model Registration Request, Fig. 1, Fig. 4 etc.) JP 09-31363 A (paragraphs 0015 to 0020, FIGS. 1 to 3 etc.)

  However, as proposed in Patent Document 1, in the method of rotating the ring member, the thickness in the vicinity of the exposed opening is often close to that of the lens as compared with the case where the shutter blade is directly driven by the drive pin. Becomes thicker than the ring member. For this reason, the thinning of the lens unit provided with the light amount adjusting device in the optical axis direction is hindered. Further, the ring member and the mechanism for driving the ring member tend to be complicated as compared with the case where the ring member is directly driven by the drive pin.

  Furthermore, as proposed in Patent Document 2, in the method in which the shape of the cam groove portion of each shutter blade is made different, a common fulcrum for rotation of each shutter blade is greatly increased from the optical axis (that is, the light passage port). The peripheral portion of the drive pin protrudes in a direction away from the optical axis, which hinders downsizing of the shutter device.

  Further, as proposed in Patent Document 3, in the method in which the rotation fulcrum of the shutter blade is arranged at a different position for each shutter blade, the fulcrum must be provided by the number of shutter blades, and around the drive pin. There is an adverse effect of increasing the area occupied by the pivot point. For this reason, restrictions are imposed on the shape of the periphery of the drive pin in the light amount adjusting device, and as a result, downsizing of the shutter device is hindered. Further, since the shutter blade operates so as not to interfere with the fulcrum of the other shutter blade, the shape of the shutter blade tends to be complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small and thin light amount adjusting device that can drive a light shielding member directly by a driving member such as a drive pin and can retract a plurality of light shielding members in a small space. One of them.

As one aspect, the light amount adjusting device of the present invention includes a base member having a light passage opening, a first retraction position that retreats from the light passage opening, and a first light shielding position that covers the light passage opening. First and second light shielding members that are rotatable about a first shaft portion provided on the base member and overlap each other in the optical axis direction at the first retracted position, and the first A first engagement portion formed on the light shielding member and a drive member that engages in common with the second engagement portion of the second light shielding member are provided so as to be able to reciprocate, and the first and second light shielding members A driving mechanism for rotating each of them in the same direction, and a light shielding member corresponding to each of the first and second light shielding members, and a second shaft centered on a second shaft portion provided on the base member; Can be rotated between the retracted position and the second light shielding position, and is common to the drive member A third engaging portion and a fourth engaging portion are provided, respectively, and symmetrical with the first and second light shielding members about an axis connecting the driving member and the optical axis center of the light passage opening. The first and second light-shielding members disposed in the first and second light-shielding members have a first opening having an inner end surface engaged with the drive member that reciprocates as the first engagement portion. The second light-shielding member has a second opening having an inner end face that engages with the reciprocating driving member as the second engaging portion, and the driving member is the first light-shielding member. In the state where the first light-shielding member is started to be engaged with the engaging portion of the first engaging portion, a moving section in which the driving member is disengaged from the second engaging portion is provided. The dimension between the 2nd engaging parts which oppose in two opening parts is set up, and the drive member and the 2nd engaging part are set. If the second light shielding member by engagement moves to the retracted position and the blocking position, is provided a stopper opening having a inner end face abutting each scan topper member provided on said base member to said second light shielding member The third light shielding member has a third opening having an inner end surface engaged with the drive member that reciprocates as the third engaging portion, and the fourth light shielding member reciprocates. A fourth opening having an inner end face engaged with each of the driving members as the fourth engaging portion, and the driving member engages with the third engaging portion to form the third engaging portion. In the state where driving of the light shielding member is started, the fourth engagement facing the fourth opening is provided so as to provide a moving section in which the driving member is disengaged from the fourth engagement portion. The dimension between the parts is set, and the driving member is engaged with the fourth engaging part. When the fourth light shielding member is moved to the retracted position and the light shielding position, the fourth light shielding member is provided with a stopper opening having an inner end surface that abuts against the stopper member, and the driving member and the light The stopper member is arranged on an axis connecting the optical axis center of the passage opening .

  As described above, the rotational speed of both light shielding members is controlled by the cam groove provided in the light shielding member by making the driving start timing of the first light shielding member different from the driving start timing of the second light shielding member. In addition, the rotation angles of the light shielding members can be made different, and the common shaft portion can be disposed close to the light passage opening (optical axis). Therefore, it is possible to arrange the peripheral portion of the drive member close to the light passage opening and arrange the light amount adjusting device in a small size.

  Moreover, by dividing into the common rotation fulcrum (first shaft portion) of the first and second light shielding members and the common rotation fulcrum (second shaft portion) of the third and fourth light shielding members. The thickness of the device (dimension in the direction of the optical axis) can be reduced compared to the case where a common fulcrum is provided for all the light shielding members, and the periphery of the drive member is further compared to the case where fulcrums are provided for the number of light shielding members. The area occupied by the rotation fulcrum can be reduced. For this reason, the apparatus can be reduced in size and thickness. In addition, the light shielding member and the shaft portion can be arranged symmetrically with respect to the operation region of the drive member and the light passage port by arranging both the rotation fulcrums on both sides of the operation region of the drive member. Therefore, the shape of the light shielding member and the driving mechanism can be simplified, and the apparatus can be further downsized.

  Further, at the light shielding position, the light shielding members adjacent in the rotation direction overlap with each other in the optical axis direction, and the portions covering the openings of the second and fourth light shielding members do not overlap in the optical axis direction. By doing so, it is possible to ensure the light shielding function at the light shielding position and to reduce the size of each light shielding member. Accordingly, the retreat space of the light shielding member at the retreat position can be reduced and the apparatus can be downsized as compared with the case where the light shielding members are formed large so that the second and fourth light shielding members overlap at the light shielding position. Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 9 show a configuration of a shutter device as a light amount adjusting device that is Embodiment 1 of the present invention. In FIG. 1, the shutter device includes a shutter base plate 4 as a base member having an opening (light passage opening) 3 through which light passes, and a sub blade 1 a and an opening 3 as a second light shielding member that covers the periphery of the opening 3. The first blade group 1 composed of the main blade 1b as the first light shielding member covering the vicinity of the optical axis AXL, and the sub blade 2a covering the periphery of the opening 3 opposite to the sub blade 1a across the optical axis AXL. And a second blade group 2 including a main blade 2b that covers the vicinity of the optical axis AXL of the opening 3 together with the main blade 1b.

  Further, the shutter device is in a direction opposite to each other between a position where the blade groups 1 and 2 are retracted from the opening 3 (hereinafter referred to as a fully open position) and a position where the opening 3 is covered (hereinafter referred to as a fully closed position). And a drive pin (drive member) 5 to be rotated. The fully open position (first retracted position) of the first blade group 1 and the fully open position (second retracted position) of the second blade group 2 are on opposite sides of the opening 3. Further, the fully closed position (first light shielding position) of the first blade group 1 is a position that covers the region on the fully open position side of the first blade group 1 from the vicinity of the optical axis AXL in the opening 3, and the second blade group The second fully closed position (second light shielding position) is a position that covers the region on the fully opened position side of the second blade group 2 from the vicinity of the optical axis AXL in the opening 3.

  Note that in the shutter device of this embodiment, there is actually play or play in the engagement of each member, so the fully open position or the fully closed position is not necessarily a single position. It means a range that can be regarded as substantially the same position including an allowable error.

  Each shutter blade is formed by pressing a thermoplastic plastic sheet having a thickness of 0.05 to 0.15 mm, which has light shielding properties and lubricity. Thereby, despite the use of a plurality of shutter blades, a reduction in weight and thickness can be achieved.

  The drive pin 5 reciprocates along an arcuate locus in the direction perpendicular to the optical axis (vertical direction in the figure) by the motor structure shown in FIG. This motor structure is composed of a rotor magnet 16 made of a permanent magnet and a stator yoke 18 having two magnetic poles mounted with a drive coil 17 and arranged opposite to the rotor magnet 16. The drive pin 5 is formed integrally with the rotor magnet 16.

  The stator yoke 18 causes the rotor magnet 16 to generate detent torque that serves as an urging force in two directions, that is, the fully open position and the fully closed position of the shutter blades, and the rotor magnet 16 according to the direction of current application to the drive coil 17. Control the direction of rotation. Thereby, the drive pin 5 operates continuously without stopping between the fully open position of the shutter blades and the fully closed position or between the fully closed position and the fully open position. In addition, as long as the urging force can be selectively applied to the rotor magnet 16 in one of the two directions, the urging force may be applied by another method using a spring or the like.

  The shutter base plate 4 includes a fulcrum shaft (first shaft portion) 6 that is a rotation center of the first blade group 1 and penetrates a round hole formed in the sub blade 1a and the main blade 1b, and a second blade. A fulcrum shaft (second shaft portion) 7 that is a rotation center of the group 2 and penetrates a round hole portion formed in the sub blade 2a and the main blade 2b is provided. The operating region (arc-shaped trajectory) of the drive pin 5 is disposed between these two fulcrum shafts 6 and 7. Thereby, the fulcrum shafts 6 and 7 and the blade groups 1 and 2 supported by them can be arranged so as to be symmetric with respect to the drive pin 5 and the opening 3, and the shape of each blade and the drive pin 5 are included. The drive mechanism can be simplified.

  Here, the round hole portions of the sub blade 1a and the sub blade 2a are engaged with the fulcrum shafts 6 and 7 with a minimum play amount necessary for the rotation of the sub blades 1a and 2a. ing. The sub blade 1a and the sub blade 2a are provided with driving elongated holes 1c and 2c into which the driving pin 5 is inserted as shown in FIG. 2, and the driving elongated holes 1c and 2c are formed as shown in FIG. As shown in FIG. 6, there is a relatively large play amount L in the operation direction of the drive pin 5 (however, only the long hole portion 1c is shown in FIG. 6). As will be described later, the play amount L allows the drive pin 5 that engages and drives the main blades 1b and 2b to operate in a non-engaged state with respect to the elongated holes 1c and 2c. Form a region.

  Further, the round hole portions of the main blade 1b and the main blade 2b are engaged with the fulcrum shafts 6 and 7 with a minimum play amount necessary for the rotation of the main blades 1b and 2b. Yes. Further, as shown in FIG. 4, the main blade 1b and the main blade 2b are formed with driving elongated holes 1f and 2f into which the driving pin 5 is inserted. As shown in FIG. The parts 1f and 2f have a minimum play amount in the operating direction of the drive pin 5 (only the drive slot 1f is shown in FIG. 7).

  That is, in the shutter device of the present embodiment, the sub blades 1a and 2a have a period in which they do not respond to the operation of the drive pin 5, whereas the main blades 1b and 2b have a period that does not respond to the operation of the drive pin 5. In response. In other words, the driving of the sub blades 1a and 2a is started with a delay from the driving start timing of the main blades 1b and 2b by the driving pins 5 from the fully open position and the fully closed position.

Further, as shown in FIG. 2 , the sub blades 1a and 2a have stopper pins 8 provided on the shutter base plate 4 that are formed symmetrically with respect to the line A connecting the optical axis AXL and the drive pin 5. It has stopper long hole portions 9 and 10 to be inserted. As shown in FIGS. 2 and 6, the stopper long hole portions 9 and 10 have inner end surfaces 9 b and 10 b that come into contact when the sub blades 1 a and 2 a are rotated to the fully open position by the drive pin 5. As shown in FIG. 7, the main blades 1b and 2b have a shape that does not come into contact with the stopper pin 8 within an operating range other than the fully open position.

  Furthermore, main blade stoppers 11 and 12 are provided on the shutter base plate 4. The main blade stopper 11 contacts the main blade 1b in the fully open position as shown in FIG. 4 to prevent further rotation of the main blade 1b in the opening direction, and as shown in FIG. It abuts on the main blade 2b in the closed position to prevent further rotation of the main blade 2b in the closing direction. On the other hand, the main blade stopper 12 contacts the main blade 2b in the fully opened position to prevent further rotation of the main blade 2b in the opening direction, and contacts the main blade 1b in the fully closed position. Thus, further rotation of the main blade 1b in the closing direction is prevented. The contact portions of the main blades with the main blade stoppers 11 and 12 are different from each other.

  As shown in FIG. 9, the shutter device configured as described above is disposed in the photographing optical system 21 of the digital camera 30 (the shutter base plate 4 is shown in FIG. 9), and the first and second blades. The light amount (exposure amount) reaching the image sensor 15 such as a CCD sensor or a CMOS sensor is controlled by the opening / closing operation of the groups 1 and 2.

  Next, an operation method of the shutter device of this embodiment will be described. In this embodiment, the case where the digital camera 30 is installed in the digital camera 30 shown in FIG. 9 will be described. However, the digital camera 30 can also be installed in an optical apparatus or a photographing apparatus such as a mobile phone with a camera or a digital video camera with a still image recording function. .

  First, before a shutter release button (not shown) provided on the camera is pressed, as shown in FIG. 4, both the first blade group 1 and the second blade group 2 are the main blades 1b and 2b and the sub blade 1a. , 2a overlap each other in the optical axis direction and are retracted from the opening 3. That is, the shutter device is in a fully opened state. At this time, the light passing through the opening 3 forms an image on the image sensor 15.

  In this state, as shown in FIG. 2, the drive pin 5 is urged away from the optical axis AXL by the detent torque described above. The drive pin 5 abuts against the inner end faces 1e, 2e of the drive elongated holes 1c, 2c of the sub blades 1a, 2a to urge the sub blades 1a, 2a in the opening direction. Further, the stopper pin 8 comes into contact with the inner end faces 9a, 10a of the stopper elongated holes 9, 10 of the sub blades 1a, 2a. If there is no contact between the stopper pin 8 and the inner end surfaces 9a, 10a, the sub blades 1a, 2a move freely with respect to the opening 3 by the play amount L shown in FIG. The sub blades 1a and 2a are held in the fully open position.

  Further, as shown in FIG. 4, the main blades 1b and 2b are applied with an urging force in the opening direction from the drive pin 5. However, the drive pin 5 and the drive oblong holes 1f and 2f of the main blades 1b and 2b are different from each other. As shown in FIG. 7, the driving direction of the drive pin 5 is engaged with only play necessary for rotation, so that the main blades 1 b and 2 b are held at the fully open position only by the drive pin 5. However, by bringing the main blades 1b and 2b in the fully open position into contact with the main blade stoppers 11 and 12, the main blades 1b and 2b can be positioned more reliably in the fully open position than in the case where the main blades 1b and 2b are held only by the drive pin 5. .

  Thus, when the shutter device is in the fully open state, each blade group includes the urging force of the drive pin 5, the stopper pin 8 and the stopper long holes 9 and 10 (inner end surfaces 9 a and 10 a) of the sub blades 1 a and 2 a. And the main blade stoppers 11 and 12 and the main blades 1b and 2b are held in an overlapped state without wobbling.

  Next, when the release button is pressed, the image pickup device 15 releases the charge accumulated so far, and then accumulates the charge of a predetermined exposure amount, and then the shutter device opens the blade groups 1 and 2 by energizing the coil 17. close. Thereby, the exposure of the image sensor 15 is completed. Then, the image sensor 15 transfers the accumulated charge to an image processing circuit (not shown).

  When the coil 17 is energized, the drive pin 5 operates in a direction approaching the optical axis AXL. When the operation of the drive pin 5 is started, the main blades 1b and 2b immediately start rotating in the closing direction by the engagement between the drive pin 5 and the drive elongated holes 1f and 2f, but the sub blades 1a and 2a The drive pin 5 is stopped until the drive pin 5 moves in the drive elongated holes 1c, 2c by the amount of play L shown in FIG. 6 and comes into contact with the inner end faces 1d, 2d of the drive elongated holes 1c, 2c, The rotation starts by the contact.

  At this time, as shown in FIGS. 4 and 5, the main blades 1b and 2b are sequentially overlapped from the sides 19 and 20 near the drive pin 5 in the opening 3, but the sub blades 1a and 2a are overlapped with each other in FIG. As shown in FIG. 3, the portions that cover the opening 3 (hereinafter referred to as the inside of the opening) do not overlap. Further, in the first and second blade groups 1 and 2, the main blades 1b and 2b and the sub blades 1a and 2a are developed from the retracted state in which the entirety is overlapped, and the amount of overlap decreases.

  Thereafter, when the drive pin 5 further moves in a direction approaching the optical axis AXL, the inner end surfaces 9b and 10b of the stopper elongated holes 9 and 10 of the sub blades 1a and 2b are eventually moved to the stopper pin 8 as shown in FIG. 5 and the main blades 1b and 2b contact the main blade stoppers 12 and 11, as shown in FIG. This state is the fully closed state of the shutter device.

  At this time, the main blades 1b and 2b adjacent in the rotation direction overlap each other in the opening direction portion of the main blades 1b and 2b in the opening 3, as shown in FIG. Similarly, the main blade 1b and the sub blades 1a adjacent to each other in the rotation direction and the main blade 2b and the sub blades 2a partially overlap each other in the opening 3. As a result, as shown in FIG. 5, the light is completely blocked by the four shutter blades, and the light toward the image sensor 15 is blocked.

  However, even in this state, the sub blades 1 a and 2 a are located away from each other in the rotation direction and do not overlap in the opening 3. For this reason, compared with the case where the sub blades 1a and 2a are formed so as to overlap each other (for example, the sub blades have a shape extending to the optical axis AXL side), the sub blades 1a and 2a can be downsized. Can do. Therefore, the blade retreat space that is the peripheral portion of the opening 3 in the shutter base plate 4 can be reduced, and the shutter device can be reduced in size (smaller diameter).

  At this time, the portions of the main blades 1b and 2b that contact the main blade stoppers 12 and 11 are different from the portions that contact the main blade stoppers 11 and 12 in the fully opened state shown in FIG. As described above, the main blade 1b using the common main blade stoppers 11 and 12 is made different in the fully opened state and the fully closed state by changing the portions of the main blades 1b and 2b that contact the main blade stoppers 11 and 12. , 2b can be positioned in the fully open position and the fully closed position, and the configuration of the shutter base plate having the main blade stopper can be simplified. However, the main blade stopper in the fully open position and the main blade stopper in the fully closed position may be provided separately.

  In such a fully closed state, each blade group has an urging force of the drive pin, abutment between the stopper pin 8 and the stopper long hole portions 9 and 10 (inner end surfaces 9b and 10b) of the sub blades 1a and 2a, The main blade stoppers 11 and 12 are held by the main blades 1b and 2b without contact.

  In addition, after the drive pin 5 starts driving from the fully open position of the sub blades 1a and 2a, until the stopper pin 8 and the stopper long hole portions 9 and 10 come into contact, the long holes of the sub blades 1a and 2a In the portions 1c and 2c, a space with a play amount L is formed on the side opposite to the operating direction of the drive pin 5, but in this embodiment, the drive pin 5 does not stop or decelerate during this time. The stopper pin 8 and the stopper long hole portions 9 and 10 always come into contact with each other except during rotation. That is, in the fully open position and the fully closed position, the driving pin 5 and the stopper pin 8 apply a force in a direction opposite to the rotation direction of each blade, so that the blade does not move carelessly.

  As described above, when the shutter device is fully closed, and then the charge transfer from the image sensor 15 is completed, reverse energization to the coil 17 is performed, and the shutter device again operates toward the fully open state. The operation of each part at this time is an operation in the opposite direction to the operation from the fully open position to the fully closed position described above, and detailed description thereof is omitted.

The contact between the main blades 1a, 2a and the main blade stoppers 11, 12 at the fully opened position and the fully closed position has a larger amount of rotation than the sub blades, in addition to the purpose of positioning the blades at the respective positions. Since the main blade suddenly stops at the fully open position and the fully closed position, the load concentrates on the drive pin 5 and the inner end face of the drive elongated hole portion of each blade engaged therewith, and the blade is deformed, or the sub blade Another object is to prevent the material from colliding with the inner end surface and bouncing back (the so-called bounce phenomenon occurs).
[ Reference example ]

A reference example of the present invention will be described with reference to FIGS. In this reference example , the same reference numerals as those in the first embodiment are given to the same components as those in the first embodiment.

In this reference example , the positioning of the sub blades 1a and 2a at the fully opened position and the fully closed position is performed around the main blade stoppers 11 and 12 and the opening 3 in the shutter base plate 4 instead of the stopper pin 8, The second embodiment is different from the first embodiment in that the sub blades 1a and 2a are brought into contact with the sub blade stoppers 13 and 14 provided on the side opposite to the fulcrum shafts 6 and 7 with the portion 3 interposed therebetween.

  That is, as shown in FIG. 10, the sub blades 1a and 2a in the fully open position are positioned by contact with the main blade stoppers 11 and 12, and as shown in FIG. 11, the sub blades 1a and 2a in the fully closed position are positioned. Is positioned in contact with the sub blade stoppers 13 and 14. In FIG. 10, the main blades 1b and 2b are omitted.

According to the present reference example , it is not necessary to provide the main blades 1b and 2b with a shape for avoiding interference with the stopper pin as compared with the first embodiment, so that the shape of the main blade can be simplified. Moreover, the load applied to the blades when the rotation of the sub blades 1a and 2a is stopped can be reduced more than when the stopper pins are used.

In this reference example , the case where the main blade stoppers 11 and 12 are used for positioning the sub blades 1a and 2a in the fully opened position has been described. However, in addition to the main blade stoppers 11 and 12, a dedicated stopper for the sub blades is provided. May be.
[Example 2 ]

For Example 2 of the present invention will be described with reference to FIG. 12. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  In this embodiment, the main blades 1b and 2b are positioned at the fully open position and the fully closed position, not the main blade stoppers 11 and 12, but the stopper pins 8 and the stoppers formed on the main blades 1b and 2b as in the first embodiment. This is different from the first and second embodiments in that the contact is made with the inner end surfaces of the long hole portions 41 and 42. The positioning principle is the same as the positioning of the sub blades 1a and 2a in the first embodiment.

  According to the present embodiment, the main blade stoppers 11 and 12 are not necessary, so that the shutter device can be further downsized. In particular, a shutter device having a small diameter (open aperture) of the opening 3 is preferable because the mass of the main blade is relatively small.

  In the present embodiment, the case where both the main blade and the sub blade are positioned only by the stopper pin 8 has been described. However, as described in the first and second embodiments, the contact between the outer peripheral portion of the blade and the stopper. You may use together with the method of positioning by.

Further, the upper you施例and Reference Examples, but the two shutter blades has been described shutter device rotatably supported by the four-blade configuration with each of the two pivot axes, supported by the fulcrum shaft shutters The number of blades may be three or more. In this case, of the three or more shutter blades, for example, two shutter blades adjacent in the rotation direction can be considered as the first and second light shielding members or the third and fourth light shielding members.

Further, the upper you施例and Reference Examples have been described shutter device having two pivot axes, it is also possible to apply the present invention to the shutter device of the two blade arrangement that the pivot axis only one .

  Furthermore, although the shutter device has been described in the present embodiment, the present invention can also be applied to a light amount adjusting device that functions as an aperture device or a light amount adjusting device that has both an aperture function and a shutter function.

1 is a front view of a shutter device that is Embodiment 1 of the present invention. FIG. The front view when the sub blade | wing in the shutter apparatus of Example 1 exists in a full open position. The front view when the sub blade | wing in the shutter apparatus of Example 1 exists in a fully closed position. FIG. 3 is a front view of the shutter device according to Embodiment 1 in a fully opened state. FIG. 3 is a front view of the shutter device according to Embodiment 1 in a fully closed state. FIG. 3 is an explanatory diagram illustrating a relationship between a driving pin and a sub blade at a fully opened position in the shutter device according to the first exemplary embodiment. FIG. 3 is an explanatory diagram illustrating a relationship between a driving pin and a main blade at a fully opened position in the shutter device according to the first exemplary embodiment. FIG. 3 is an explanatory diagram of a motor structure in the shutter device according to the first embodiment. FIG. 2 is a schematic diagram of a digital camera in which the shutter device of Embodiment 1 is incorporated. The front view when the sub blade | wing in the shutter apparatus which is Example 2 of this invention exists in a full open position. The front view in the fully closed state in the shutter apparatus of a reference example . The front view in the fully-closed state of the shutter apparatus which is Example 2 of this invention. The front view of the conventional 2 blade shutter apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st blade group 2 2nd blade group 1a, 2a Sub blade 1b, 2b Main blade 3 Opening portion 4 Shutter base plate 5 Drive pin 6, 7 Support shaft 8 Stopper pin 9a, 9b, 10a, 10b Inside of stopper long hole portion End face 11, 12 Main blade stopper 13, 14 Sub blade stopper 15 Image sensor 16 Rotor magnet 17 Drive coil 18 Stator yoke

Claims (5)

A base member having a light passage opening;
Between the first retracted position retracted from the light passage opening and the first light shielding position covering the light passage opening, the first shaft portion provided in the base member can be rotated around the first shaft portion. The first and second light shielding members overlapping each other in the optical axis direction at the first retracted position;
A drive member that engages in common with a first engagement portion formed on the first light-shielding member and a second engagement portion of the second light-shielding member is provided so as to be capable of reciprocating, and the first and second A drive mechanism for rotating each of the light shielding members in the same direction ;
A light shielding member corresponding to each of the first and second light shielding members, and rotating between a second retracted position and a second light shielding position around a second shaft portion provided on the base member. A third engaging portion and a fourth engaging portion that are movable and engage in common with the drive member, respectively, and are centered on an axis that connects the drive member and the optical axis center of the light passage opening. Third and fourth light shielding members disposed symmetrically with the first and second light shielding members;
The first light shielding member has a first opening having an inner end surface engaged with the driving member that reciprocates as the first engaging portion, and the second light shielding member reciprocates. The first light-shielding member has a second opening having an inner end face that engages with each of the drive members as the second engagement portion, and the drive member engages with the first engagement portion. The second engaging portion opposed to the second opening so as to provide a moving section where the driving member is disengaged from the second engaging portion in a state where driving of the member is started Set the dimension between
When moving the second shielding member by the engagement between the drive member and the second engagement portion in said retracted position and said blocking position, inner end face abutting each scan topper member provided on said base member A stopper opening having the second light-shielding member ;
The third light shielding member has a third opening having an inner end surface engaged with the driving member that reciprocates as the third engaging portion, and the fourth light shielding member reciprocates. A fourth opening having an inner end face that engages with each of the driving members as the fourth engaging portion; and the third light shielding by the driving member engaging with the third engaging portion. In the state where the driving of the member is started, the fourth engaging portion which is opposed to the fourth opening portion is provided such that a moving section is provided in which the driving member is disengaged from the fourth engaging portion. Set the dimension between
When the driving member moves the fourth light shielding member to the retracted position and the light shielding position by engaging with the fourth engaging portion, a stopper opening having an inner end surface that abuts against the stopper member, respectively. Provided in the fourth light shielding member;
The light quantity adjusting device , wherein the stopper member is arranged on an axis connecting the driving member and the optical axis center of the light passage opening . In the first and second light shielding positions,
The first light shielding member is located farther from the first retracted position than the second light shielding member, and the third light shielding member is further away from the second retracted position than the fourth light shielding member. Located
Among the first to fourth light shielding members, a part of a portion covering the opening of the light shielding member adjacent in the rotation direction overlaps in the optical axis direction, and the openings of the second and fourth light shielding members The light amount adjusting device according to claim 1 , wherein a portion covering the portion is positioned so as not to overlap in the optical axis direction. Light amount adjusting device according to claim 1 or 2, characterized in that across the working area of the drive member and the first shaft portion provided with the second shaft portion. It has the light quantity adjustment device according to any one of claims 1 to 3 ,
An optical apparatus characterized in that the light amount reaching the image plane is controlled by the light amount adjusting device. A light amount adjusting device according to any one of claims 1 to 3 ,
An imaging device comprising: an image sensor that photoelectrically converts light that has passed through the light amount adjusting device.

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