JP2006038887A - Light quantity adjusting device and camera equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light quantity adjusting device having high assembly accuracy and capable of keeping thinning in an optical axis direction with simple constitution, and a camera in which the light quantity adjusting device is mounted. <P>SOLUTION: Six positioning pins 36 of an assembling fixture 35 are preformed so that rectangular shape formed by linking tangents on their inner sides may coincide with the external dimension of a base plate 26, a spacer 25 and a presser plate 23. In assembling a shutter device 21, the base plate 26 where a strip electrode is disposed and the spacer 25 are superposed and put to be aligned with the inner surfaces of the positioning pins 36 of the assembling fixture 35, and a shading curtain 24 to which an electret is applied is housed in the frame of the spacer 25, then the presser plate 23 is superposed and put thereon. Thereafter, the outer circumferential surfaces of the base plate 26, the spacer 25 and the presser plate 23 are fixed with an adhesive. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light amount adjusting device having a simple configuration, high assembly accuracy, and capable of maintaining a thin shape in the optical axis direction, and a camera equipped with the same.

  2. Description of the Related Art In recent years, an electronic camera that converts an object image formed using an optical lens or the like into an electrical signal by an image sensor such as a CCD (Charge Coupled Device) and records the image as a captured image on a recording medium has been widely used.

  In general, the camera has a diaphragm for adjusting the amount of light from the subject and an instantaneous image of the subject in the optical aperture on the optical path from the subject, whether it is a silver film camera or an electronic camera. It is necessary to provide a shutter. It is also known that the shutter operation is so good that it can immediately respond to continuous shooting.

An example in which an inductive charge type actuator is used for driving control of a light amount adjusting device such as a shutter or a diaphragm of a camera has been proposed. As the light quantity adjusting device, there are one and two sliders (moving elements, light-shielding curtains) for one stator (stator, substrate), and both use the slider as a shutter blade or a diaphragm blade. A technique has been disclosed in which a strip-like electrode for driving a slider is provided on a substrate in order to function. (For example, refer to Patent Document 1.)
Japanese Patent Laid-Open No. 08-220592 ([Summary], FIG. 1, [0011], FIG. 2)

  By the way, in order to configure an actuator composed of a stator and a slider as a shutter (or a diaphragm, hereinafter the same) device as in Patent Document 1, the shutter curtain is held at a movable distance between the stator and the holding plate. In addition, it is necessary to accurately position and assemble the members constituting the shutter device.

However, Patent Document 1 has no disclosure or suggestion about positioning and assembling the stator, the slider, and the pressing member.
An object of the present invention is to provide a light amount adjusting device having a simple configuration and high assembly accuracy and capable of maintaining a thin thickness in the optical axis direction, and a camera equipped with the same, in view of the above-described conventional situation.

  First, a light amount adjusting device according to a first aspect of the present invention includes a light shielding curtain previously polarized at a predetermined interval, a strip electrode for driving the light shielding curtain, a substrate having an optical opening, and an optical opening. A light quantity adjusting device comprising: a pressing plate that movably holds the light-shielding curtain between the substrate and an interval maintaining member that maintains an interval between the substrate and the pressing plate. A positioning function for determining the positions of the pressing plate and the interval maintaining member is provided on any or all of the substrate, the pressing plate, and the interval maintaining member.

  The positioning function is configured to be an outer peripheral surface perpendicular to the moving surface of the light-shielding curtain, for example, in any or all of the substrate, the pressing plate, and the interval maintaining member. An inner peripheral surface perpendicular to the moving surface of the light shielding curtain of the stepped portion formed inside along the edge of the position member, and an outer peripheral surface perpendicular to the moving surface of the light shielding curtain of the substrate and the pressing plate, And, for example, a protrusion perpendicular to the moving surface of the light shielding curtain provided on the spacing maintaining member, and an outer peripheral surface perpendicular to the moving surface of the light shielding curtain of the substrate and the pressing plate. Composed.

  Moreover, in this light quantity adjustment apparatus, the said board | substrate and the said press board are provided with the site | part for positioning in the thickness direction mutually, for example. In this case, it is preferable that the part for positioning is constituted by a surface that is parallel to the moving surface of the light shielding curtain and is located outside the moving range of the light shielding curtain.

  Next, a camera according to a second aspect of the invention is configured by mounting the above light amount adjusting device on a shutter position or an aperture position of an optical system.

  As described above, according to the present invention, each member constituting the light amount adjusting device has a position for positioning, so that the assembly accuracy is high and the optical axis direction is thinned with a simple configuration. It is possible to provide a light amount adjustment device that can be maintained and a camera equipped with the same.

Embodiments of the present invention will be described below with reference to the drawings.
(Examples 1-3)
FIG. 1 is a diagram showing a schematic configuration of a digital camera equipped with a light amount adjusting device of the present invention, showing a perspective view showing an appearance from the front of the digital camera on the top, and disposing main parts inside the digital camera below. The perspective view which shows a state transparently is shown.

  As shown in the upper part of FIG. 1, the digital camera 1 includes a photographing lens window 2 in the upper right corner of the front surface and a strobe irradiation window 3 on the left side. A release button 4 is provided at the left end of the upper surface.

  As shown in the lower part of FIG. 1, the inside of the digital camera 1 occupies approximately 2/3 of the entire left side, and a control device including a circuit board 5 on which various electronic components are mounted and a detachable / replaceable battery. 6 etc. are arranged. A unitized lens device 7 is disposed in a portion occupying approximately 1/3 of the entire right side.

  The lens device 7 bends a light beam from a subject incident along a photographing optical axis O1 shown in the lower part of FIG. 1 from the photographing lens window 2 shown in the upper part of FIG. The incident light flux is guided to an image pickup device such as a CCD disposed at the lower end portion of the lens device 7 along a second optical axis O2, which will be described below and bent downward. To generate a captured image.

  FIG. 2 is a cross-sectional view taken along the line AA ′ of the lens device 7 shown in the lower part of FIG. 1 as viewed from the left side of the digital camera 1, and shows a schematic configuration of each part of the lens unit. In the lens device 7 shown in the lower part of FIG. 1, a lens group is placed on the first fixed lens frame portion 8 along the second optical axis O2 bent downward as shown in FIG. The first fixed lens portion 9 held, the first moving lens portion 12 holding the lens group in the first moving lens frame 11, and the second moving lens frame 13 holding the lens group. The second moving lens unit 14, the third moving lens unit 16 having the lens held by the third moving lens frame 15, the second fixed lens unit 18 having the lens held by the second fixed lens frame unit 17, and these And an image pickup device 19 disposed at the end of the lens portion.

  The first moving lens unit 12 and the second moving lens unit 14 change the focal length of the luminous flux of the subject incident along the second optical axis O2 of the optical system of the lens device 7, that is, the zoom ratio. The third moving lens unit 16 is provided for adjustment, and is provided for focus adjustment in which the light beam forms an image on the image sensor 19. A shutter position (also an aperture position) 20 is provided between the first moving lens unit 12 and the second moving lens unit 14.

  3 is an enlarged perspective view of the lens device 7 shown in the lower part of FIG. 1 as viewed from the back side of the lower part of the digital camera 1 in FIG. In FIG. 3, the shutter device (or the aperture shutter device) assembled to the lens device 7 is shown alone on the right side of the lens device 7.

  As shown in FIG. 3, the lens device 7 incorporates a shutter device (or aperture shutter device) 21 at the shutter position (aperture position) 20 shown in FIG. As shown on the right of FIG. 3, the shutter device (or aperture shutter device) 21 is a device that forms a rectangular flat plate, and has an optical opening 22 serving as a transmission path of the second optical axis O2. I have. 2 is disposed at the end of the second optical axis O2 that passes through the optical opening 22 of the shutter device (or aperture shutter device) 21, that is, at the lower end of the lens device 7. Has been.

  FIG. 4 is an exploded perspective view showing a basic configuration of the shutter device 21 incorporated in the lens device 7. As shown in the figure, the shutter device 21 is configured by laminating a pressing plate 23, a light shielding curtain 24, a spacer 25 as an interval position member, and a substrate 26.

  The holding plate 23 is made of, for example, metal or ceramic, and includes the optical opening 22 shown in the right side of FIG. 3. The holding plate 23 is fixed by adhesion or the like with the spacer 25 sandwiched from the front and back together with the substrate 26. A light shielding curtain 24 is accommodated in the frame and is held movably. The light shielding curtain 24 is provided with electrets to be described later that are electrically polarized in advance at a predetermined pitch, although they are not clearly seen in the drawing.

  The substrate 26 is made of, for example, a transparent member (for example, a glass plate), and is used for driving the light-shielding curtain 24 on the entire surface excluding the optical aperture 27 set at a position corresponding to the optical aperture 22 of the pressing plate 23. A strip electrode 28 is provided.

Here, the driving principle of driving the light-shielding curtain in the diaphragm device (or diaphragm shutter device) according to the present invention will be described.
FIG. 5 is a diagram for explaining the driving principle of the shutter device (or aperture shutter device) of the present invention. In the following description of the driving principle, the substrate 26 is referred to as the stator 26, and the light shielding curtain 24 is referred to as the moving member 24. A mechanism for driving the light shielding curtain is referred to as a shutter mechanism.

  The shutter mechanism basically includes a stator 26 and a mover 24, and the mover 24 is configured to be movable in the left-right direction with respect to the stator 26 as shown in the upper and lower parts of FIG. The stator 26 is provided with an opening (optical opening 27) for guiding a light image from the subject to the image sensor (see the image sensor 19 in FIGS. 2 and 3), and a plurality of strips. Electrodes 28 are formed side by side at a predetermined interval. The other mover 24 is a light-shielding member and has a permanently polarized dielectric part. Such a configuration of the moving element 24 is called an electret.

  In general, electrets are made by heating and melting polymer materials such as Teflon (registered trademark), polypropylene, and mylar that are difficult to conduct electricity, and solidifying between the electrodes while applying a high DC voltage to the electrodes. When it is removed, it is a term that refers to a surface that is in contact with the electrode being positively or negatively charged, and that these polarizations (a state divided into positive and negative electricity) are maintained semipermanently.

  In the above shutter mechanism, when positive and negative voltages are periodically applied to the belt-like electrode 28, an attractive force or a repulsive force is generated between the belt-like electrode 28 and the electret of the slider 24. As a result, the slider 24 is It moves relative to the stator 26.

  Therefore, the shutter mechanism can be configured by allowing the moving element 24 to move so as to open or shield the opening (optical opening 27) of the stator 26. The upper part of FIG. 5 shows a state where the shutter is open, and the lower part of FIG. 5 shows a state where the shutter is closed. Hereinafter, the shutter mechanism according to this configuration will be referred to as an “electret shutter”.

  Note that the opening (optical opening 27) of the stator 26 does not necessarily have to be a physical opening such as a through-hole, and the stator 26 is a transmissive member, and a band shape is formed at a position corresponding to the opening. A transmissive region in which the electrode 28 is not provided may be formed.

  FIG. 6 is a diagram schematically showing the electret shutter and its drive circuit. In the figure, a cross section of the electret shutter is schematically shown on the right, and a drive circuit is shown in a block diagram on the left. As shown in the figure, a voltage signal line from a drive (voltage application) circuit 29 is connected to each strip electrode 28 arranged on the stator 26. A four-phase voltage signal is applied to the voltage signal line. Therefore, the same voltage signal is applied to the strip electrode 28 every four lines. In FIG. 6, the voltage signals are distinguished by attaching symbols A, B, C, and D to the strip electrode 28.

  A moving element 24 is arranged so as to face the surface of the stator 26 where the band-like electrode 28 is provided. The mover 24 includes a plurality of the above-described dielectrics (electrets) 31 that are permanently polarized on the surface facing the stator 26.

  In the drive circuit 29 shown on the left side of the figure, the pulse generation circuit 32 generates a rectangular wave train (drive pulse signal), and this drive pulse signal is supplied to the booster circuit 33 and the phase shifter 34. The booster circuit 33 boosts the input drive pulse signal to about 100 V, branches it into voltage signals having two polarities, and supplies them to the drive electrodes A and C.

  On the other hand, the drive pulse signal input to the phase shifter 34 has a waveform delayed by 90 °, and is then input to the booster circuit 33 and branched into voltage signals having the same two polarities as described above to drive electrode B And D.

  FIG. 7 is a diagram showing a voltage signal sequence generated by the drive circuit 29 and applied to the strip electrode 28. Regarding the voltage state of the strip electrode 28 (A, B, C, D), four state changes from t1 to t4 in the period T are repeated corresponding to the progress of each period T in the time t.

  FIG. 8 is a diagram for further explaining the operation of the electret shutter. (1) in FIG. 8 is an electret and drive electrode immediately after the voltage state of each strip electrode 28 (A, B, C, D) in FIG. 7 is switched to the state of the applied voltage at t1 shown in FIG. The correspondence relationship is shown.

  The electret 31 a receives a repulsive force from the drive electrode A and receives an attractive force from the drive electrode B. The electret 31 b receives a repulsive force from the drive electrode C and receives a suction force from the drive electrode D. For this reason, the moving element 24 receives a force in the right direction in the drawing and moves by one drive electrode pitch d.

  (2) in FIG. 8 shows the correspondence between the electret and the drive electrode immediately after switching to the state of the applied voltage at t2 shown in FIG. 7 following the above. The electret 31a receives a repulsive force from the drive electrode B and receives an attractive force from the drive electrode C. In addition, the electret 31 b receives a repulsive force from the drive electrode D and receives an attractive force from the drive electrode A. For this reason, the moving element 24 receives a force in the right direction in the figure and moves again by one drive electrode pitch d.

  (3) in FIG. 8 shows the correspondence between the electret and the drive electrode immediately after switching to the state of the applied voltage at t3 shown in FIG. 7 following the above, and (4) in FIG. Following (3), the correspondence relationship between the electret and the drive electrode immediately after switching to the applied voltage state at t4 shown in FIG. 7 is shown. Similar to the operations described in (1) and (2) of FIG. 8, the mover 24 sequentially moves by one drive electrode pitch d.

  Then, by repeating this operation, the movable element 24 moves to the right in FIG. In order to move the mover 24 in the left direction of FIG. 8, the polarity of the voltage applied to the strip electrode 28 may be switched in reverse.

  As described above, the movable element 24 of the present example itself has a semi-permanent polarization charging unit. Therefore, as in an inductive charge type actuator, for example, the number of steps and time for repeating voltage application, charge storage, and electrostatic induction are repeated. Therefore, the moving element can be driven quickly by simply applying the driving voltage.

  9 shows an exploded perspective view of the shutter device 21 shown in FIG. 4 as the first embodiment and its assembling jig on the left, and shows its assembled state on the right. As shown in the upper left of FIG. 9, six positioning pins 36 are erected on the assembly jig 35. The rectangular shape formed by connecting the inner tangent lines of these positioning pins 36 is formed in advance so as to match (substantially match) the outer dimensions of the substrate 26, the spacer 25, and the pressing plate 23.

  When assembling the shutter device 21, the substrate 26, the spacer 25, the light-shielding curtain 24, and the pressing plate 23 shown in the left of FIG. 9 are sequentially aligned with the inner surface of the positioning pin 36 of the assembly jig 35 as shown on the right of FIG. After the overlapping, the outer peripheral surfaces of the substrate 26, the spacer 25, and the pressing plate 23 are fixed with an adhesive.

  Thus, in this example, a method of assembling with the assembly jig 35 on the basis of the outer peripheral surface (positioning portion) perpendicular to the moving surface of the light shielding curtain 24 of the substrate 26, the spacer 25, and the pressing plate 23 is shown. Yes.

  At the time of assembly, the light-shielding curtain 24 is assembled so as to be accommodated in the frame of the spacer 25, that is, so as not to overlap the spacer 25. In this embodiment, six positioning pins 36 are used as positioning members of the assembly jig 35. However, the shape of the positioning pins 36 is not limited to a cylindrical shape as shown in the figure. Moreover, if it is the structure which can position the outer peripheral surface as a positioning part of the board | substrate 26, the spacer 25, or the pressing board 23, it will not be limited to a several pin. For example, the positioning shape may be machined on the assembly jig itself.

  FIG. 10 shows a completed perspective view of the shutter device 21 ′ as the second embodiment at the upper left, an exploded perspective view of the shutter device 21 ′ from the lower left to the upper right of the center, and a BB ′ cross section of the shutter device 21 ′ on the right. The enlarged arrow view is shown. In FIG. 10, the same components as those in FIG. 4 are denoted by the same reference numerals as those in FIG.

  As shown in FIG. 10, the shutter device 21 ′ of this example is configured by sequentially stacking a pressing plate 37, a light shielding curtain 24, a spacer 39, and a substrate 41. As in the case of the first embodiment, the light-shielding curtain 24 is incorporated so as to be accommodated in the frame of the spacer 39, that is, so as not to overlap the spacer 39.

  In this example, the spacer 39 is formed with a step portion on the inner side along the edge thereof, and the inner peripheral surface 42 perpendicular to the moving surface of the light shielding curtain 24 on the inner side along the edge by the step portion. (In the figure shown in the center of FIG. 10, the peripheral surfaces on the inner peripheral surface 42 on the side facing the pressing plate 37 and the two peripheral surfaces on the near side are not visible behind the protruding end. 41 on the inner peripheral surface 42 on the side facing 41 and the peripheral surfaces of the two sides on the near side are hidden behind the outer peripheral surface, and the light shielding curtain 24 is also formed on the inner side along the edge. A frame surface 43 parallel to the moving surface is formed (in the figure shown in the center of FIG. 10, only the frame surface 43 facing the pressing plate 37 is visible, and the frame surface 43 facing the substrate 41 is not visible in the figure). Has been.

  As a positioning portion perpendicular to the optical axis O2 corresponding to the inner peripheral surface 42, the substrate 41 has an outer peripheral surface 44 perpendicular to the moving surface of the light shielding curtain 24 (on the side facing downward in the figure shown in the center of FIG. 10). The outer peripheral surface 44 of the two sides is shaded in the figure and is not visible), and the outer peripheral surface 45 perpendicular to the moving surface of the light-shielding curtain 24 is also formed on the holding plate 37 (lower in the figure shown in the center of FIG. 10). The outer peripheral surface 45 of the two sides on the opposite side is shaded in the figure and cannot be seen).

  Further, as a positioning portion in the direction parallel to the optical axis O2 corresponding to the frame surface 43, that is, in the thickness direction of the shutter device 21 ', the substrate 41 is parallel to the moving surface of the light shielding curtain 24 on the surface facing the spacer 39. Further, an edge peripheral surface 46 is formed outside the movement range of the light shielding curtain 24, and the pressing plate 37 is parallel to the movement surface of the light shielding curtain 24 on the side facing the spacer 39 and the light shielding curtain 24. An edge peripheral surface 47 is formed outside the movement range.

  In addition, the edge peripheral surface 47 of the pressing plate 37 is formed on the side surface indicated by the arrow a in the figure shown in the center of FIG. 10 and is not visible in the figure, but the range is indicated by a virtual line by a broken line. Yes. In addition, chamfers 48 are provided at the corners of the outer peripheral surface so that the pressing plate 37 and the substrate 41 are surely fitted in the stepped portion formed by the inner peripheral surface 42 and the frame surface 43 of the spacer 39. .

  Thus, in this example, the outer peripheral surfaces 44 and 45 perpendicular to the moving surface of the light shielding curtain 24 of the substrate 41 and the pressing plate 37 are set as the positioning portions in the direction perpendicular to the optical axis O2 with respect to the spacer 39. Edge peripheral surfaces 46 and 47 parallel to the moving surface of the light shielding curtain 24 of the plate 37 serve as positioning portions in the direction parallel to the optical axis O2, that is, in the thickness direction of the shutter device 21 '.

  Although not particularly described in the first embodiment, an edge peripheral surface parallel to the moving surface of the light shielding curtain 24 of the substrate 26 and the pressing plate 23 in FIG. 9 is parallel to the optical axis O2, that is, the shutter device 21. The positioning in the thickness direction is the same as in the first embodiment.

  FIG. 11 shows a completed perspective view of an aperture shutter device 21 ″ as the third embodiment at the upper left, and an exploded perspective view of the aperture shutter device 21 ″ from the lower left to the upper right. As shown in FIG. 11, the diaphragm shutter device 21 ″ of the present example includes a first substrate 54 having a strip electrode 53 for driving the optical aperture 51 and the first light shielding curtain 52, and the above-described electret. The first light shielding curtain 52, the partition plate 56 having the optical opening 55, the second light shielding curtain 57 provided with the electret, the optical opening 58, and the strip-shaped electrode 59 for driving the second light shielding curtain 57 are provided. The second substrate 61 is sequentially stacked.

  The partition plate 56 has an interval maintaining unit 62 for maintaining an interval so that the first and second light shielding curtains 52 and 57 can be held movably between the first and second substrates 54 and 61. It is provided integrally.

  Further, the partition plate 56 is provided with positioning projections 63 extending in the direction parallel to the optical axis O2 at the four corners. On the other hand, the four corners of the first and second substrates 54 and 61 are chamfered to form positioning surfaces 64 and 65.

  When the positioning surfaces 64 and 65 and the positioning projections 83 provided on the partition plate 56 are engaged, the first substrate 54, the partition plate 56, and the second substrate 61 are positioned at a right angle to the optical axis O2. Be positioned.

  The positioning protrusions 63 provided on the partition plate 56 are not limited to the cylindrical shape as in the present embodiment, and the positions of the positioning protrusions 63 are not limited to the four corners. Further, the shape of the positioning surfaces 64 and 65 of the first and second substrates 54 and 61 is not limited to the chamfered shape, and a through hole or notch that matches the shape of the positioning projection of the pressing plate 56 is used. It goes without saying that it does not matter.

  In addition, the first and second light shieldings are parallel to the moving surfaces of the first and second light shielding curtains 52 and 57 of the first and second substrates 54 and 61 with respect to the interval maintaining part 62 of the partition plate 56. The edge peripheral surface located outside the movement range of the curtains 52 and 57 is the positioning portion in the thickness direction of the aperture shutter device 21 ″ as in the case of the first or second embodiment.

  In the above embodiment, the shutter device configured to be incorporated in a small digital camera has been described. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to a focal plane shutter of a single-lens reflex camera, for example.

1 is an external perspective view showing a schematic configuration of a digital camera equipped with a light amount adjusting device of the present invention, and a perspective view transparently showing an arrangement state of main parts inside the camera. It is a figure which shows the schematic structure of each part of a lens unit seeing the AA 'arrow cross section of the lens apparatus shown under FIG. 1 from the left side of a digital camera. It is the expansion perspective view which looked at the lens apparatus shown under FIG. 1 from the back side of the digital camera. It is a disassembled perspective view which shows the basic composition of the shutter apparatus integrated in a lens apparatus. It is a figure explaining the drive principle of the shutter apparatus (or aperture shutter apparatus) of this invention. It is a figure which shows typically the electret shutter and its drive circuit concerning the shutter apparatus (or aperture shutter apparatus) of this invention. It is a figure which shows the voltage signal sequence produced | generated by the drive circuit of an electret shutter, and applied to a drive electrode. It is a figure which further demonstrates operation | movement of an electret shutter. An exploded perspective view of the shutter device according to the first embodiment and its assembling jig are shown on the left, and its assembled state is shown on the right. An upper perspective view of the shutter device as the second embodiment is shown at the upper left, an exploded perspective view of the shutter device from the lower left to the upper right of the center, and an enlarged view of the shutter device taken along the line B-B 'on the right. A completed perspective view of the aperture shutter device as the third embodiment is shown at the upper left, and an exploded perspective view of the aperture shutter device is shown from the lower left to the upper right.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital camera 2 Shooting lens window 3 Strobe irradiation window 4 Release button 5 Circuit board 6 Battery 7 Lens apparatus 8 First fixed lens frame part 9 First fixed lens gap part O1 Imaging optical axis O2 Second optical axis 11 First moving lens frame 12 First moving lens unit 13 Second moving lens frame 14 Second moving lens unit 15 Third moving lens frame 16 Third moving lens unit 17 Second fixed lens frame unit 18 Second fixed lens unit 19 Image sensor 20 Shutter position (aperture position)
21, 21 ′, 21 ″ Shutter device (aperture shutter device)
22 Optical aperture 23 Presser plate 24 Light-shielding curtain 25 Spacer 26 Substrate 27 Optical aperture 28 Band electrode 29 Drive (voltage application) circuit 31 Dielectric (electret)
32 Pulse generation circuit 33 Booster circuit 34 Phaser 35 Assembly jig 36 Positioning pin 37 Holding plate 39 Spacer 41 Substrate 42 Inner peripheral surface perpendicular to the moving surface of the light shielding curtain 43 Frame surface 44, 45 parallel to the moving surface of the light shielding curtain Outer peripheral surfaces perpendicular to the moving surface of the light shielding curtain 46, 47 Edge peripheral surface 48 Chamfer 51 Optical opening 52 First light shielding curtain 53 Strip electrode 54 First substrate 55 Optical opening 56 Partition plate 57 Second light shielding curtain 58 Optical aperture 59 Band-shaped electrode 61 2nd board | substrate 62 Space | interval maintenance part 63 Positioning protrusion 64, 65 Positioning surface

Claims (7)

A light shielding curtain polarized in advance at a predetermined interval, a strip electrode for driving the light shielding curtain, a substrate having an optical opening, and an optical opening capable of moving the light shielding curtain between the substrate. A light quantity adjusting device comprising a holding plate to hold, and an interval maintaining member for maintaining an interval between the substrate and the holding plate,
A light quantity adjusting device characterized in that a positioning function for determining the positions of the substrate, the pressing plate, and the interval maintaining member is provided on any or all of the substrate, the pressing plate, and the interval maintaining member. .   The light quantity adjusting device according to claim 1, wherein the positioning function is an outer peripheral side surface perpendicular to a moving surface of the light shielding curtain in any or all of the substrate, the pressing plate, and the interval maintaining member. .   The positioning function includes an inner peripheral surface perpendicular to a moving surface of the light shielding curtain of a stepped portion formed inside along an edge of the interval position member, and a moving surface of the light shielding curtain of the substrate and the pressing plate. The light amount adjusting device according to claim 1, wherein the light amount adjusting device is an outer peripheral surface perpendicular to the outer peripheral surface.   The positioning function includes: a protrusion perpendicular to the movement surface of the light shielding curtain provided on the spacing maintaining member; and an outer peripheral surface perpendicular to the movement surface of the light shielding curtain of the substrate and the pressing plate. The light quantity adjusting device according to claim 1, wherein   The light amount adjusting device according to claim 1, wherein the substrate and the pressing plate include portions for positioning in the thickness direction.   2. The light amount adjusting device according to claim 1, wherein the portion for positioning is a surface that is parallel to a moving surface of the light shielding curtain and is located outside a moving range of the light shielding curtain. A camera comprising the light amount adjusting device according to claim 1 mounted at a shutter position or an aperture position of an optical system.

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