JPH0814675B2 - Aperture device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm device to be mounted on an optical device such as a camera, and more particularly to a diaphragm device suitable for a micro camera.

BACKGROUND OF THE INVENTION Video cameras are used not only for filming movies and for recording general images, but also as object recognition sensors for automatic devices such as robots and surveillance sensors for crime prevention equipment. Conventional video cameras are quite large and expensive, and although they have been widely used, they have not yet met various potential demands.

According to market research on video cameras, the potential demand is enormous, and if a low-priced microminiature video camera is developed, the huge demand can be realized by applying the camera to various fields. It is expected.

In consideration of such a current situation, at present, the development of a cylindrical ultra-compact video camera with a diameter of about 5 to 15 mm is planned, but technical development concerning such a small-diameter video camera or still camera has not been conducted in the past. I've never been told,
There are many technical problems that must be solved for the practical use of this video camera, and for example, the problem related to the diaphragm device was one of them. From the viewpoint of its size, this microminiature camera is more suitable for a usage pattern in which an object is supported by another object and used in an unmanned state and in remote operation than in a usage pattern in which a person supports while shooting with a hand. The shutter and the diaphragm device need to be of an electric type, but since the camera is very small, for example, it is impossible to use a known electromagnetically driven diaphragm device mounted on a lens shutter camera. there were. In addition, since the motor portion of the known electromagnetically driven aperture device is designed based on the lens diameter of the compact camera, it has been found that simply reducing the size of the motor portion results in insufficient output and cannot drive the aperture blades. I have.

Therefore, in order to realize the above-mentioned ultra-small camera, it was necessary to develop a new electromagnetically driven diaphragm device having a structure different from that of the known electromagnetically driven diaphragm device mounted on the compact camera.

Incidentally, among various electromagnetically driven diaphragm devices conventionally proposed for mounting on a compact camera or the like, a motor having an annular disc-shaped stator and an annular disc-shaped rotor is provided and There is a structure in which the diaphragm blades are pivotally attached to the rotor, but if the electromagnetically driven diaphragm device of this type is downsized, the motor output will be significantly reduced and it will not be possible to drive the diaphragm blades. If the motor is designed so that such an output can be obtained, the outer diameter of the motor becomes large.

On the other hand, when designing such an ultra-small aperture device, it has also been found that there are the following problems relating to the aperture blades in addition to the problems relating to the motor as described above.

Generally, in a diaphragm device, when the diaphragm is fully closed, the tips of the diaphragm blades are in contact with each other because they overlap each other. In the apparatus, since the length of each diaphragm blade is relatively long, the deflection angle of the diaphragm blade is small, and therefore the deflection of the diaphragm blade does not adversely affect the rotation of the diaphragm blade.

On the other hand, in the ultra-small diaphragm device as described above, since the length of each diaphragm blade is short, the deflection angle of each diaphragm blade is large, so that each diaphragm blade cannot rotate in a plane orthogonal to the optical axis. There was a risk of colliding with other diaphragm blades during rotation.

[Object of the Invention] An object of the present invention is to provide a diaphragm device suitable for a microminiature camera, and a diaphragm device having a novel structure different from the conventionally known electromagnetically driven diaphragm device (or direct electric shutter). Is to provide.

[Summary of the Invention] In a diaphragm device according to the present invention, a first light-shielding member and a second light-shielding member that are swingably supported by a support member and that swing at least partially overlap each other. In the diaphragm device, the first light shielding member has a first protrusion protruding in the optical axis direction, the height position in the optical axis direction of the supporting member being determined by contact with the supporting member. The second light shielding member has a second protrusion protruding in the optical axis direction in which the height position in the optical axis direction with respect to the support member can be determined by contacting the support member, and the second protrusion is Since the second light shielding member is set to be displaced from the first light shielding member in the optical axis direction by having a protrusion amount different from that of the first protrusion, each of the light shielding members is swayed to a position where they overlap each other. Even if they move, the light blocking members do not collide with each other. A diaphragm device can be provided.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic vertical sectional view of a micro camera incorporating a diaphragm device according to the present invention. In FIG. 1, most of the camera structure other than the diaphragm device of the present invention is not shown. 2 is an exploded perspective view of a main part of the diaphragm device of the present invention, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG.
FIG. 1 is a perspective view showing the external appearance of a micro video camera incorporating the diaphragm device of the present invention.

In FIG. 1, reference numeral 1 denotes a camera body of the camera, and a diaphragm device 2 according to the present invention and a lens front lens L ₁ are built in the vicinity of the tip of the camera body 1.

A diaphragm device 2 according to the present invention comprises a main body 3 fixed to a camera body 1 and a rotor 4 rotatable with respect to the main body 3.
A coil unit 5 fixed to the main body 3, a plurality of diaphragm blades 6 to 8 pivotally attached to the front end surface of the rotor 4, permanent magnets 9 and 10 fixed to the rotor 4, and the diaphragm. The front cover 11 fixed to the main body 3 is provided with a cam groove for controlling the opening / closing operation of the blades 6-8.

The body 3 has a double cylindrical structure having a cylindrical lens holding portion 3a at the center thereof and an outer cylindrical portion 3b concentric with the lens holding portion 3a, and has an outer peripheral surface of the lens holding portion 3a. An annular space is formed between the outer cylindrical portion 3b and the inner peripheral surface. The interior of the lens holding part 3a lens after lens L ₂ is accommodated, the rotor 4 to the distal end portion outer peripheral surface of the lens holding part 3a
A circumferential recess 3c (see FIG. 2) is formed as a rolling path of the spherical body 12 for rotatably supporting the spherical body 12. Further, a screw insertion hole 3d (a stupid hole) for inserting a screw for connecting and fixing the front cover 11 is formed through the outer peripheral surface of the main body 3.

A double cylindrical rotor 4 having an inner cylindrical portion 4a and an outer cylindrical portion 4b is inserted into an annular space formed between the lens holding portion 3a of the main body 3 and the outer cylindrical portion 3b. The inner cylindrical portion 4a is rotatably fitted to the outer peripheral surface of the lens holding portion 3a of the main body 3 via the spherical body 12. As shown in FIG. 3, a pair of cylindrical curved permanent magnets 9 and 10 are fixed at symmetrical positions with respect to the center of the rotor at two locations on the outer peripheral surface of the inner cylindrical portion 4a of the rotor 4. Further, as shown in FIG. 2, three pin holes 4c to 4e for pivotally attaching three diaphragm blades 6 to 8 are formed in the front end plate portion of the rotor 4, and each pin hole 4c to Pins 6a to 8a (6a are not shown in FIG. 2) pivotally mounted on one surface of each diaphragm blade 6 to 8 are rotatably inserted in 4e. (Note that the structure of the diaphragm blades will be described in detail later.) The outer cylindrical portion and the front end plate portion of the rotor 4 are cut as shown in FIG. 2 for positioning during assembly of the diaphragm device. A notch 4f is formed so that the screw insertion hole 3d of the main body 3 and a projection of a front cover 11 described later are positioned at the notch when the throttle device is assembled. .

The front cover 11 disposed in front of the aperture blades 6 to 8 is configured to be fastened to the main body 3, and a protrusion 11 b having a screw hole 11 a corresponding to a screw insertion hole 3 d of the main body 3 is formed in an axial direction. It is projected. When assembling the aperture device, the projection 11
b and the screw insertion hole 3d of the main body 3 are positioned at the position of the notch 4f of the rotor 4, and the screw insertion hole 3d and the projection 11b are positioned.
Then, the main body 3 and the front cover 11 are fastened by screwing a screw (not shown) into the screw hole 11a through the screw insertion hole 3d.

In the front end plate portion of the front cover 11, three cam grooves 11c, 11d, for slidably inserting driven pins 6b, 7b, 8b protruding from the other surfaces of the aperture blades 6 to 8, respectively. 11e is penetrated.
In the case of the present embodiment, the cam grooves are linear grooves extending in the radial direction with respect to the axis of the front cover 11, and each cam groove 11
c to 11e are formed at positions separated from each other by 120 ° with respect to the axis.

Three diaphragm blades 6 pivotally attached to the front end plate of the rotor 4
.About.8 swing about the respective pivot points in parallel with the surface of the front end plate portion (in a plane orthogonal to the optical axis) in response to the rotation of the rotor. The aperture blades 6 to 8 open and close an optical path hole 3e (see FIG. 1) formed through the front end surface of the lens holding portion 3a of the main body 3. In the fully closed state in which the optical path hole 3e is completely closed by the aperture blades, the tip portions of the aperture blades overlap each other in the optical axis direction and come into contact with each other, but in the fully open state in which the optical path hole 3e is fully opened, The tips of the aperture blades stop at positions separated from each other. Further, when the optical path hole 3e is fully opened, the driven pins 6b to 8b of each aperture blade move to the outermost end positions of the cam grooves of the front cover 11, and when the optical path hole 3e is fully closed, each aperture blade is closed. The driven pins 6b, 7b, 8b of are moved to the innermost position of each cam groove.

Diaphragm blades 6 to 8 provided in the diaphragm device of this embodiment
Is formed in the structure shown in FIGS. 2 and 5 to 7 in order to prevent mutual interference between the diaphragm blades during the opening / closing operation. That is, the diaphragm blade 8 arranged at the most front in the optical axis direction has the pivot pin 8a and the front cover 11 inserted into the pin hole 4e of the rotor 4 as shown in FIGS. 2 and 7.
Has a driven pin 8b inserted into the cam groove 11e and has a thick spacer portion 8c formed around the pivot pin 8a. Further, as shown in FIGS. 2 and 5, the diaphragm blade 6 arranged at the rearmost in the optical axis direction is a semicircle formed around the driven pin 6b in addition to the pivot pin 6a and the driven pin 6b. It has a thick spacer portion 6c. Further, the diaphragm blade 7 arranged between the diaphragm blades 6 and 8 is, as shown in FIGS. 2 and 6, an annular thick first spacer formed around the pivot pin 7a. It has a portion 7d and an annular thick second spacer portion 7c formed around the driven pin 7b.

When the diaphragm blades 6 to 8 are pivotally attached to the pin holes 4c, 4d and 4e of the rotor 4 at the respective pivot pins 6a, 7a and 8a and overlap each other, the rear end surface (that is, The surface on which the landing pin 6a is provided is in surface contact with the front end plate portion of the rotor 4, but the spacer portion 6c of the diaphragm blade 6 is in contact with the rear end plate portion of the front cover 11, so The diaphragm blades 6 are arranged close to the front end plate portion side of the rotor 4 without making surface contact between the front end surface and the rear end plate portion of the front cover 11 to secure an operating space for the diaphragm blades 7 and 8. There is. Diaphragm blade 7
7c and the rear end plate portion of the front cover 11, the spacer portion 7d of the diaphragm blade 7 and the front end plate portion of the rotor 4 come into contact with each other, so that the spacer portion 7d of the diaphragm blade 7 secures an operating space for the diaphragm blade 6. Therefore, the front end surface of the diaphragm blade 6 and the rear end surface of the diaphragm blade 7 (the surface on which the pivot pin 7a projects)
Are not in surface contact with each other, and therefore both diaphragm blades 6 and 7
Can rotate in parallel to each other, and even if the tips of both diaphragm blades are largely bent, they do not interfere with each other. On the other hand, the front end surface of the diaphragm blade 8 is in surface contact with the rear end plate portion of the front cover 11, but the spacer portion 8d of the diaphragm blade 8 is in contact with the front end plate portion of the rotor 4, so that the rear end surface of the diaphragm blade 8 is in contact. And the front end plate portion of the rotor 4 are not in surface contact with each other, and the diaphragm blades 8 are arranged so as to be closer to the rear end plate portion side of the front cover 11 to secure an operating space for the diaphragm blades 6 and 7. The spacer blade 7c of the diaphragm blade 7 causes the diaphragm blade 8
Since the working space of the diaphragm blade 7 is secured, the front end surface of the diaphragm blade 7 and the rear end surface of the diaphragm blade 8 do not come into surface contact with each other, so that both diaphragm blades 7 and 8 can rotate in parallel to each other and Even if the tips of the blades bend greatly, the two do not interfere with each other.

8 to 10 show modified examples of the diaphragm blades 6 to 8 shown in FIGS. 5 to 7. As shown in FIGS. 8 to 10, the diaphragm blade 61 arranged at the rearmost position.
Has a pivot pin 61a, a driven pin 61b, and a spacer portion 61c, and the diaphragm blade 71 arranged at the intermediate position has a pivot pin 71a.
And a driven pin 71b and a spacer portion 71c. Further, the diaphragm blade 8 arranged at the forefront also has a pivot pin 81a, a driven pin 81b, and a spacer portion 81c. In addition,
The spacer portion 71c of the diaphragm blade 71 corresponds to a combination of the two spacer portions 7c and 7d of the diaphragm blade 7 shown in FIG. 6, and the spacer portion 71c projects from the front end surface and the rear end surface of the diaphragm blade 71. ing.

The diaphragm blades shown in FIGS. 8 to 10 are shown in FIGS.
The function of the diaphragm blades 61 to 81 is the same as that of the diaphragm blade shown in the figure in which the spacer area is enlarged.
Is exactly the same as the function of.

FIG. 11 shows an example of diaphragm blades having the same function as the diaphragm blades but different structures. The diaphragm blade 62 shown in FIG. 11 (the diaphragm blade arranged at the rearmost part,
In the case of the present embodiment, the diaphragm blades arranged at the forefront and intermediate positions also have the same structure, so only one is shown. )
Has a tapered cross section, and has the largest wall thickness at the position (base end) of the pivot pin 62a, and the wall thickness decreases at a constant rate as it approaches the front end. That is, the blade thickness at the position of the pivot pin 62a, the driven pin 6
The blade thickness at the position 2b and the blade thickness at the tip end are different, and both the front surface and the rear surface of the blade are inclined surfaces. Therefore, 3 of the diaphragm blades having such a structure
Even when the sheets are overlapped with each other, the tips of the blades do not come into strong contact with each other, so that mutual interference of the diaphragm blades can be prevented.

FIGS. 16 to 18 show modified examples of the diaphragm blades 6 to 8 shown in FIGS. 5 to 7.

When the diaphragm blades 63 to 83 are pivotally attached to the pins 4c, 4d and 4e of the rotor 4 at the pivotal attachments 63a, 73a and 83a, respectively, and in the state where they are overlapped with each other, the rear end surface of the aperture blades 63 (that is, the pivotal attachment). The surface on which the pin 63a is provided is in surface contact with the front end plate portion of the rotor 4, but the front end surface of the diaphragm blade 63 is in contact with the spacer portion 73d of the diaphragm blade 73, and the spacer portion 63c of the diaphragm blade 63 is in front. Since it is in contact with the rear end plate of the cover 11, the front end surface of the diaphragm blade 63 and the rear end surface of the diaphragm blade 73 are not in surface contact with each other,
Therefore, both diaphragm blades 63 and 73 can rotate in parallel with each other, and even if the tips of both diaphragm blades are largely bent, they do not interfere with each other. On the other hand, the spacer portion 83c provided on the rear end surface of the diaphragm blade 83 comes into contact with the front end plate portion of the rotor 4, and the spacer portion 83d of the diaphragm blade 83.
Is in contact with the front end surface of the intermediate portion of the diaphragm blade 73, and the front end surface of the diaphragm blade 73 and the rear end surface of the diaphragm blade 83 are not in surface contact with each other, so that both diaphragm blades 73 and 83 rotate in parallel with each other. In addition, both ends do not interfere with each other even if the tips of both aperture blades are largely bent.

Here, the portions other than the diaphragm blades will be described with reference to FIG. 2 again.

A coil unit 5 shown in FIG. 2 is disposed in an annular space formed between the lens holding portion 3a and the outer cylindrical portion 3b of the main body 3, and a plurality of coils provided in the coil unit 5 are mounted on a rotor. 4 and the permanent magnets 9 and 10
Are arranged in the annular space so as to face each other with a predetermined gap. The coil unit 5 includes an annular disc-shaped printed wiring board 13 fitted and fixed in an annular groove formed in the rear end plate portion of the main body 3, and along an arc parallel to the peripheral edge of the printed wiring board 13. It is composed of four plate-shaped coils 14 to 17 which are arranged and fixed upright on the printed wiring board so as to be curved in a cylindrical surface shape. Wiring 18 connected to each coil is attached to the printed wiring board 13, and the wiring 18 is arranged at the position of the notch 4f of the rotor. As shown in FIG. 2, each of the coils 14 to 17 has a winding wound around an axis in the radial direction with respect to the center of the printed wiring board 13, and
It is curved into a cylindrical surface along an arc parallel to the peripheral edge of 13. Of these four coils, a pair of coils 14 and 15 arranged symmetrically with respect to the axis of the printed wiring board.
Is a drive coil for generating an electromagnetic force for driving the rotor 4, and the other pair of coils 16 and 17 is a detection coil for detecting the rotation speed and the rotation direction of the rotor 4. Has become.

As shown in FIGS. 12 and 13, the printed wiring board 13 has an arcuate groove 13a for fitting and fixing the lower end of each coil.
And each coil is fitted into one of the grooves 13a and fixed to the printed wiring board 13. The groove 13a has a function of holding each coil in a curved shape, and a function of keeping a gap between each coil and the outer cylindrical portion of the rotor and a gap between each coil and the permanent magnet constant. Cage,
The depth t of the groove 13a is designed to be a considerably large value so that the coil does not fall or deform. The groove 13
In order to make the depth of a equal to or larger than a predetermined value, only the portion where the groove is arranged may be made thick.

Each coil has a permanent magnet 9 as shown in FIGS.
, 10 and the inner peripheral surface of the outer cylindrical portion 4b of the rotor are arranged so as to face each other with a predetermined gap, and each coil is arranged in the permanent magnets 9 and 10 as shown in FIG. It is arranged at a position closer to one side from the center in the circumferential direction.

FIG. 14 is a diagram showing the positional relationship between the permanent magnets and the coils in more detail and showing the state of the magnetic flux distribution at the rotor rest position.

Each of the permanent magnets 9 and 10 is S, N, S from one end side to the other end side along the circumferential direction as shown in FIG. 14 (only half of the diaphragm device is shown in FIG. 14). And the center of the drive coil 14 and the center of the detection coil 16 are respectively arranged at the boundary positions between the S pole and the N pole of the permanent magnet. Therefore, one half of each of the drive coil 14 and the detection coil 16 faces the N pole or S pole of the permanent magnet 9 in the plane orthogonal to the optical axis as shown in FIG. It faces the south pole or the north pole. The portion of the coil that applies the driving torque to the rotor is the portion along the optical axis of the driving coil (the winding portion in the direction orthogonal to the paper surface in FIG. 14)
And one of the two parts in the optical axis direction is the permanent magnet 9
, And the other faces the S pole.

The distribution of the magnetic flux generated from the permanent magnet 9 is as shown in the figure. When a current in the direction shown in the figure is applied to the drive coil 14 in this state, the drive coil 14 is driven by Fleming's left-hand rule.
The torques indicated by arrows T ₁ and T ₂ act on the two optical axis portions of the rotor, respectively. However, since the drive coil 14 is fixed to the main body 3, the rotor 4 moves toward the arrow A with respect to the drive coil 14. Will be moved in the direction of. When the rotor 4 is rotated in the direction of arrow A from the position shown in FIG. 14 and the two optical axis direction portions of the drive coil 14 are relatively moved to a position facing the N pole region of the permanent magnet 9, one of the drive coils is moved. Since the direction of the electromagnetic force acting on the portion in the optical axis direction (the lower portion in FIG. 14) is reversed, the rotor 4 stops.

On the other hand, when the rotor 4 is rotated in the direction of arrow A from the position shown in FIG. 14, the N pole region of the permanent magnet 9 moves away from the detection coil 16 and instead the S pole region (in FIG. Since the pole area) moves toward the center of the detection coil, the number of magnetic fluxes that interlink with the two winding portions of the detection coil 16 changes, so the induced current in the direction that compensates for the interlinkage magnetic flux change. Occurs in the detection coil 16, and the rotation speed (that is, the opening / closing speed of the diaphragm blades and the diaphragm change rate) and the rotation direction of the rotor 4 are detected by a control circuit (not shown) connected to the detection coil 16. .

The control circuit has a function of controlling the amount of light passing through the diaphragm device to be constant, and the actual amount of light is detected according to the aperture blade opening / closing speed detected by the detection coils 16 and 17 and the amount of light detected by another light amount detector. The light quantity is calculated, and the supply currents to the drive coils 14 and 15 are changed so that the difference between the set light quantity and the actual light quantity becomes zero.

If the direction of the current supplied to the drive coil is opposite to that in the state shown in FIG. 14, the direction of the torque acting on the rotor 4 is opposite to that in FIG. 14, and the rotor 4 is opposite to the arrow A. Driven in the direction.

FIG. 15 shows the magnetic flux distribution in the vertical cross section of the rotor 4, and the magnetic flux generated from the N pole region of the outer peripheral surface of the permanent magnet 9 is the outer cylindrical portion 4b of the rotor 4 and the front end of the rotor as shown in the figure. A magnetic circuit that returns to the S-pole region on the inner peripheral surface of the permanent magnet 9 through the plate portion is configured. The electromagnetic force generated by this magnetic circuit becomes a force that urges the rotor 4 downward (from the front of the diaphragm device toward the rear) in FIG.
This has the effect of preventing the forward movement of the rotor 4 in the axial direction.

In the throttle device of this embodiment, the rotor 4 has a double cylindrical structure, that is, a so-called double rotor structure. Therefore, most of the magnetic flux generated from the permanent magnet is linked with the drive coil and then passes through the rotor to the permanent magnet. In this case, the leakage magnetic flux is smaller than that of the known spindle motor, so that the leakage loss is small. As a result, the diaphragm device has an efficient driving source.

Further, since the electromagnetic force generated in the axial cross section serves as a force for urging the rotor 4 axially rearward, there is no fear of the rotor 4 vibrating in the axial direction, and the spherical body 12 as a bearing also serves as the bearing of the lens holding portion 3a. There is no danger of escaping from the circumferential recess 3c on the outer circumference.

A pressing ring 19 is fitted in the circumferential recess 3c so that the sphere 12 does not escape from the circumferential recess 3c.

Although the permanent magnet is attached to the inner cylindrical portion of the rotor 4 in the above embodiments, a structure in which the permanent magnet is attached to the inner peripheral surface of the outer cylindrical portion of the rotor may be adopted.
The rotor does not necessarily have to be a double cylinder.

In addition, although the embodiment shows the case where the pivot pin is projectingly provided on each aperture blade, the rotor pin is provided with the pivot pin and the aperture blade is provided with a pin hole to be fitted to the pivot pin. You may stay.

[Effects of the Invention] As described above, in the diaphragm device according to the present invention, the first light shielding member is swingably supported by the support member, and at least partially overlaps each other by swinging. And a second light-shielding member, wherein the first light-shielding member is in contact with the support member, and the first light-shielding member protrudes in the optical axis direction to determine the height position in the optical axis direction with respect to the support member. The second light shielding member has a second protrusion protruding in the optical axis direction in which the height position in the optical axis direction with respect to the supporting member is determined by contacting the supporting member, Since the second protrusion has a protrusion amount different from that of the first protrusion, the second light shielding member is set to be displaced from the first light shielding member in the optical axis direction. Even if the member and the second light shielding member are swung to the position where they overlap each other, Since the height position is determined in the optical axis direction with respect to the support member so as to be displaced in the optical axis direction, it is possible to prevent the light shielding members from colliding with each other, and there is little malfunction and high reliability. Can be provided.

Further, since the first light shielding member and the second light shielding member come into contact with the support member at the first protrusion and the second protrusion, respectively, the first light shielding member and the second light shielding member swing. Since the contact resistance between the first light shielding member and the second light shielding member and the supporting member generated at this time can be reduced, and it is possible to drive even with a small driving force, not only can the diaphragm device be downsized. A device having a diaphragm device can also be downsized.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an essential part of an ultra-small video camera incorporating a diaphragm device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of an essential part of the diaphragm device incorporated in the camera of FIG. Fig. 3 is a sectional view taken along the line III-III of Fig. 1, Fig. 4 is a perspective view showing the appearance of the camera shown in Fig. 1, Fig. 5 to Fig. 11, and Fig. 16 to Fig. FIG. 18 is a diagram showing an embodiment relating to the structure of diaphragm blades, in which (a) is a front view,
(B) is a sectional view, (c) is a rear view, FIG. 12 is a front view of a printed wiring board of a coil unit incorporated in the diaphragm device, FIG. 13 is a sectional view of the printed wiring board, and FIG. FIG. 15 is an enlarged horizontal cross-sectional view of a main part of the diaphragm device, and FIG. 15 is an enlarged vertical cross-sectional view of the diaphragm device with the diaphragm blades omitted. 1 ... Camera body, 2 ... Aperture device 3 ... Main body (of aperture device 2), 4 ... Rotor 5 ... Coil unit, 6-8 ... Aperture blades 9 and 10 ... Permanent magnet, 11 ... Front cover 13 …… Printed wiring boards 14 and 15 …… Drive coils 16 and 17 …… Detection coils 61 to 81 …… Aperture blades, 62 …… Aperture blades.

Continuation of the front page (56) References JP-A-50-120621 (JP, A) Actually opened 54-106832 (JP, U) Actually opened 55-155226 (JP, U) Actually opened 62-197134 (JP , U) Actual development 57-139926 (JP, U) Actual public 47-4379 (JP, Y1)

Claims (1)

[Claims] 1. A diaphragm device having a first light-shielding member and a second light-shielding member, which are swingably supported by a support member and are at least partially overlapped with each other by swinging. The first light-shielding member has a first protrusion protruding in the optical axis direction, the height position of which in the optical axis direction can be determined with respect to the support member by coming into contact with the support member, and the second light-shielding member. The member has a second protrusion protruding in the optical axis direction in which the height position in the optical axis direction with respect to the support member is determined by contacting the support member, and the second protrusion is the first protrusion. A diaphragm device having a protrusion amount different from that of the first protrusion so that the second light shielding member is set to be displaced from the first light shielding member in the optical axis direction.