JP2005316327A - Light quantity adjusting device and camera using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light quantity adjusting device preventing failure caused by static electricity by an electret system or an induction charge system. <P>SOLUTION: The base plate 28 of a shutter device 21 is made of a transparent member such as a glass plate where a plurality of strip electrodes 35 are formed all over the surface except an optical aperture part 33 and a periphery part 34 on a surface opposed to a light shielding curtain 31. A spacer 29 is provided to maintain a gap between the base plate 28 and a plate member 32. The electrically polarized electret at previously desired pitch is applied to the light shielding curtain 31, and is driven by the strip electrodes 35 of the base plate 28. The light shielding curtain 31 is moved in both directions shown by a two-way arrow C in a range surrounded by the spacer 29. The plate member 32 is made of a transparent glass plate, its part other than an optical aperture part 36 on a surface opposed to the light shielding curtain 31 is covered with a conductive coated or metallic vapor-deposited light shielding member 37 having conductivity, and a terminal 24 is attached to the plate member 32 with a conductive adhesives. The terminal 24 is connected to the metallic chassis of the lens device so as to discharge the static electricity generated on the light shielding curtain 31 to the metallic chassis. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light amount adjusting device for preventing problems caused by static electricity using an electret type or inductive charge type actuator and a camera using the same.

Conventionally, electrostatic actuators have been proposed as driving sources for positioning devices and the like. Such a moving element of the electrostatic actuator has a structure called an electret having a permanently polarized dielectric part. (For example, see Patent Document 1.)
In addition, an example in which a dielectric charge type actuator is used for a positioning device of a light amount adjusting device such as a camera shutter mechanism has been proposed. As the shutter mechanism, one or two sliders (movers) are moved by moving the dielectric charges of the strip electrodes provided on one or both surfaces of one stator (stator). In both cases, the slider functions as a shutter blade. (For example, see Patent Document 2.)
Japanese Patent Laid-Open No. 04-112683 ([Example], FIG. 1) Japanese Patent Laid-Open No. 08-220592 ([Summary], FIG. 1, [0011], FIG. 2)

By the way, Patent Document 2 only shows a correspondence relationship between the arrangement of the stator and the mover, and does not show a specific configuration for causing the mover to function as a shutter blade.
However, when such a slider is applied to an actual product as a shutter blade, that is, a light-shielding curtain, in order to regulate the position of the light-shielding curtain in the optical axis direction, for example, a transparent having an optical opening that restricts the luminous flux is used. A structure in which a small gap is formed between the transparent glass plate or resin plate and a substrate having a strip electrode, and the light shielding curtain is movably sandwiched in the minute gap. Is required.

  In that case, in the case of a conventional mechanical shutter device, the shutter curtain and the members constituting the shutter device are mechanically connected to a device (for example, a camera) in which the shutter device is incorporated. It is in a state connected to a predetermined potential of the device to be incorporated. Therefore, even if static electricity is generated in the shutter curtain, it is not a problem because it is energized to the electric potential (usually ground potential) on the apparatus body side.

  However, a shutter curtain (light-shielding curtain) of a shutter device that applies electrostatic force like a shutter device using an electret type or induction charge type actuator, on the other hand, is a surface on which a belt-like electrode of a substrate is mechanically formed. The static electricity is accumulated in the light-shielding curtain because it repeats the movement while being in sliding contact with the light. On the other hand, the light-shielding screen where the static electricity is accumulated is electrically separated from the device in which the shutter device is incorporated. There is a possibility that a malfunction may occur such that the curtain is electrostatically attracted to the glass plate or the resin plate and the correct moving operation cannot be performed.

  In view of the above-described conventional situation, an object of the present invention is to provide a light amount adjusting device that prevents problems caused by static electricity using an electret type or induction charge type actuator and a camera using the same.

  First, a light amount adjusting device according to a first aspect of the present invention includes a base electrode provided with a strip electrode and an optical opening for driving a light shielding curtain, a light shielding curtain that is electrically polarized in advance at a desired pitch, A light quantity adjusting device configured by laminating a plate-like member having an optical opening and maintaining the light-shielding curtain movably in a gap formed between the substrate and the substrate; The surface facing the light-shielding curtain is a surface having conductivity and is configured to be fixed at a predetermined potential.

  The plate-like member is configured to exist at least in a movable range of the light shielding curtain, for example, and the conductive surface is connected to a predetermined potential of a device in which the light amount adjusting device is incorporated, for example. Also, for example, the conductive surface is configured to be connected to the ground of a device in which the light amount adjusting device is incorporated. It is configured to have a connecting portion for connecting to a potential or ground, and is composed of, for example, a glass plate whose surface other than the optical opening is covered with a light-shielding member having conductivity. A transparent conductive member is provided in the optical opening, and a portion other than the optical opening is formed of a glass thin plate covered with a light-shielding member having conductivity. Is composed of light-shielding conductive resin sheet member provided with, also, for example, a metal sheet member provided with the optical apertures.

Moreover, when it is a metal sheet member in this way, the metal sheet member is configured by being subjected to an antireflection treatment.
Next, a camera according to a second aspect of the invention is configured by including any of the light amount adjusting devices described above at a shutter position or an aperture position of an optical system.

  According to the present invention, in the light amount adjusting device, the portion that contacts the light shielding curtain is formed of a conductive material, and the portion formed of the conductive material is connected to the ground of the device to which it is assembled. Provided is a light amount adjusting device that can prevent a malfunction caused by static electricity using an electret type or induction charge type actuator, and a camera using the same. It becomes possible.

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

  FIGS. 1A and 1B are diagrams illustrating a schematic configuration of a digital camera in which a lens device including a shutter device as a light amount adjusting device according to the first embodiment is incorporated. FIG. 1A illustrates the digital camera. FIG. 2B is a perspective view showing an arrangement state of main parts inside the digital camera.

As shown in FIG. 2A, the digital camera 1 includes a photographic lens window 2 in the upper right corner of the front surface and a strobe irradiation window 3 on the left side thereof. A release button 4 is provided at the left end of the upper surface.
As shown in FIG. 2B, the interior of the digital camera 1 occupies about 2/3 of the entire left side, and includes a control device comprising 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 the light beam from the subject incident along the photographing optical axis O1 shown in FIG. 2B from the photographing lens window 2 shown in 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.

  2 is a cross-sectional view taken along the line AA ′ of the lens device 7 shown in FIG. 1B as viewed from the left side of FIG. 1B of the digital camera 1. Show. Inside the lens device 7 shown in FIG. 1B, as shown in FIG. 2, a lens is attached to the first fixed lens frame portion 8 along the second optical axis O2 bent downward. The lens group is held in the first fixed lens section 9 holding the group, the first moving lens unit 12 holding the lens group in the first moving lens frame 11, and the second moving lens frame 13. The second moving lens unit 14, the third moving lens unit 16 having the lens held by the third moving lens frame 15, and the second fixed lens having the lens held by the second fixed lens frame unit 17. A portion 18 is provided. And the image pick-up element 19 is arrange | positioned at the terminal of these lens parts.

  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.

  FIG. 3 (a) is an enlarged perspective view of the lens device 7 shown in FIG. 1 (b) as seen from the back side of FIG. 1 (b) of the digital camera 1, and FIG. 3 (b) shows the shutter device. It is a figure shown independently. As shown in FIG. 3A, the lens device 7 incorporates a shutter device 21 at the shutter position (aperture position) 20 shown in FIG. As shown in FIG. 3 (b), the shutter device 21 is a device that forms a slightly rectangular flat plate, and serves as a transmission path for the second optical axis O2 shown in FIG. The optical opening 22, a retracting part 23 adjacent to the optical opening 22 in the long side of the rectangle, and a terminal 24 projecting outward from the side surface of the end opposite to the retracting part 23. ing.

  2 is disposed at the end of the second optical axis O2 that passes through the optical opening 22 of the shutter device 21, that is, at the lower end of the lens device 7. Further, as shown in FIG. 3A, the lens device 7 is provided with a chassis connection terminal 26 in the vicinity of the shutter position (aperture position) 20 shown in FIG. The terminal 26 and the terminal 24 of the shutter device 21 are connected via a lead wire 27. These connections are made by soldering or conductive adhesive.

4 (a) is an exploded perspective view of the shutter device 21, and FIG. 4 (b) is a B arrow view of the member shown at the top. As shown in FIG. 2A, the shutter device 21 includes a substrate 28, a spacer 29, a light shielding curtain 31, and a plate-like member 32 shown from the bottom of the figure.
The substrate 28 is made of a transparent member, for example, a glass plate, and has a plurality of strips on the entire surface except for the optical opening 33 and the peripheral portion 34 on the surface facing the light shielding curtain 31 in order to drive the light shielding curtain 31. An electrode (drive electrode) 35 is formed.

The spacer 29 is provided to maintain a gap formed between the substrate 28 and the plate-like member 32, and a notch 29-1 having a predetermined size is formed at one corner.
Although the light shielding curtain 31 does not appear clearly in the figure, an electret, which will be described later in detail, is electrically polarized in advance at a desired pitch. The electret is driven by the strip electrode 35 of the substrate 28, and the light-shielding curtain 31 moves in the two directions indicated by the double arrow C in FIG. The light shielding curtain 31 also has a notch 31-1 having a predetermined size at one corner.

  The plate-like member 32 is made of a transparent glass plate as a base material, and has an optical opening 36 as shown in FIGS. A portion other than the portion 36 is subjected to a light shielding process covered with a light shielding member 37 having conductivity such as conductive coating or metal deposition. The terminal 24 described above is adhered to the surface having the light shielding treatment and having conductivity with a conductive adhesive.

  The plate-like member 32 is provided in order to keep the light-shielding curtain 31 movably in a gap formed between the substrate 28 and the static electricity generated in the light-shielding curtain 31 to prevent the light-shielding member 37, the terminal 24, It has a function of escaping to the metal chassis 25 of the lens device 7 via the lead wire 27 and the chassis connection terminal 26 shown in FIG.

  The metal chassis 25 of the lens device 7 is connected to the circuit board 5 shown in FIG. 1B and is set to a predetermined potential or ground potential of the digital camera 1. That is, the terminal 24 is a connection part for connecting the surface of the plate-like member 32 covered with the conductive light shielding member 37 to a predetermined potential or ground potential of the lens device 7.

  The notch 29-1 of the spacer 29 and the notch 31-1 of the light-shielding curtain 31 are combined with the four members shown in FIG. 4 (a), and the shutter shown in FIGS. 3 (a) and 3 (b). It is formed so as not to compete (interfere) with the bonding portion of the terminal 24 when the device 21 is obtained.

  In such a configuration of the shutter device 21, the arrangement of the plate-like member 32 into which the spacer 29 that allows movement within the enclosure of the light shielding curtain 31 is sandwiched between the substrate 28 is put in other words. Thus, it can be said that the plate-like member 32 exists in at least the movable range of the light-shielding curtain 31.

  The plate-like member 32 is configured so that the portion other than the optical opening 36 on the surface facing the light-shielding curtain 31 is covered with the light-shielding member 37 having conductivity before the optical opening 36. In addition, a light-transmitting conductive thin curtain such as ITO (Indium Tin Oxide) is formed in advance in a slightly wide range, and a conductive light shielding member 37 is provided in a portion excluding the optical opening 36. In addition, the configuration including the optical aperture 36 can be set to a predetermined potential of the digital camera 1, and a configuration in which an antistatic effect can be expected can be obtained.

Here, the driving principle of the shutter mechanism for driving the light shielding curtain 31 in the shutter device 21 in this example will be described.
FIGS. 5A and 5B are diagrams illustrating the driving principle of the shutter mechanism in the shutter device 21 of the present invention. In the following description of the driving principle, it will be called a stator 38 instead of the substrate 28, and a mover 39 instead of the light-shielding curtain 31.

  The shutter mechanism basically includes a stator 38 and a mover 39, and the mover 39 is configured to be movable in the left-right direction with respect to the stator 38 as shown in FIGS. Has been. The stator 38 is provided with an opening (optical opening 41) 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 strip electrodes. 42 are formed side by side at a predetermined interval. The other mover 39 is a light-shielding member and has a permanently polarized dielectric portion. Such a configuration of the mover 39 is called an electret.

  In general, electrets are made by heating and melting a polymer material such as Teflon (registered trademark), polypropylene, and mylar that is 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 42, an attractive force or a repulsive force is generated between the belt-like electrode 42 and the electret of the slider 39. As a result, the slider 39 is It moves relative to the stator 38.
Therefore, the shutter mechanism can be configured by allowing the mover 39 to move so as to open or shield the opening (optical opening 41) of the stator 38. FIG. 5A shows a state where the shutter is open, and FIG. 5B 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 41) of the stator 38 does not necessarily have to be a physical opening such as a through-hole. The stator 38 is used as a transmission member, and a strip electrode is formed at a position corresponding to the opening. A transmissive region in which 42 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 43 is connected to each strip electrode 42 arranged on the stator 38. A four-phase voltage signal is applied to the voltage signal line, and accordingly, the same voltage signal is applied to every four strip electrodes 42. In FIG. 6, the voltage signals are distinguished by attaching symbols A, B, C, and D to the strip electrode 42.

A moving element 39 is arranged so as to face the arrangement surface of the belt-like electrode 42 of the stator 38. The mover 39 is provided with a plurality of the above-described dielectrics (electrets) 44 that are permanently polarized on the surface facing the stator 38.
In the drive circuit 43 shown on the left side of the figure, the pulse generation circuit 45 generates a rectangular wave train (drive pulse signal), and this drive pulse signal is supplied to the booster circuit 46 and the phase shifter 47. The booster circuit 46 boosts the input drive pulse signal to about 100 V, branches it into voltage signals having two polarities, and supplies them to the strip electrodes A and C.

On the other hand, the drive pulse signal input to the phase shifter 47 has a waveform delayed by 90 °, and is then input to the booster circuit 46 and branched into voltage signals having the same two polarities as described above, and the strip electrode B And D.
FIG. 7 is a diagram showing a voltage signal sequence generated by the drive circuit 43 and applied to the strip electrode 42. As for the voltage state of the strip electrode 42, 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. FIG. 7A shows the state of the electret and the strip electrode immediately after the voltage state of each strip electrode 42 (A, B, C, D) in FIG. The correspondence is shown.
The electret 44 a receives a repulsive force from the strip electrode A and receives a suction force from the strip electrode B. The electret 44 b receives a repulsive force from the strip electrode C and receives a suction force from the strip electrode D. Therefore, the mover 39 receives a force in the right direction in the figure and moves by one band electrode pitch d.

  FIG. 8B shows the correspondence between the electret and the strip electrode immediately after switching to the state of the applied voltage at t2 shown in FIG. 7 following the above. The electret 44 a receives a repulsive force from the strip electrode B and receives a suction force from the strip electrode C. The electret 44 b receives a repulsive force from the strip electrode D and receives a suction force from the strip electrode A. For this reason, the mover 39 receives a force in the right direction in the figure and moves again by one band electrode pitch d.

  FIG. 8 (c) shows the correspondence between the electret and the strip electrode immediately after switching to the state of the applied voltage at t3 shown in FIG. 7 following the above, and FIG. ), The correspondence relationship between the electret and the strip electrode immediately after switching to the state of the applied voltage at t4 shown in FIG. 7 is shown. Similar to the operation described in FIGS. 8A and 8B, the mover 39 sequentially moves by one band-like electrode pitch d.

Then, by repeating this operation, the mover 39 moves to the right in the figure. In order to move the mover 39 in the left direction in the figure, the polarity of the voltage applied to the strip electrode 42 may be switched in reverse.
As described above, the movable element 39 of the present example itself includes a semi-permanent polarization charging unit. Therefore, as in an inductive charge type actuator, for example, the time and effort 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.

  FIG. 9 is an exploded perspective view of the shutter device according to the second embodiment. In the shutter device 48 of this example shown in the figure, the substrate 49 has the same configuration as the substrate 28 of the shutter device 21 shown in FIG. Further, the spacer 51 and the light shielding curtain 52 in the shutter device 48 of this example have the same configuration as the spacer 29 and the light shielding curtain 31 of the shutter device 21 shown in FIG. 4 except that there is no notch.

The plate-like member 53 in the shutter device 48 of the present example is constituted by a light-shielding conductive resin sheet member 55 provided with an optical opening 54. The optical opening 54 is a physical opening formed through the light-shielding conductive resin sheet member 55.
As the light-shielding conductive resin sheet member 55, for example, Soma Black (registered trademark) film (product number: Soma B-H50MDED, manufactured by Somaru Corporation, ED means conductivity) is suitable.

  In this case, since the plate-like member 53 is entirely conductive, the terminal 24 after the four members of FIG. 9 are assembled so that the terminal 24 does not compete (interfere) with the spacer 51 and the light-shielding curtain 52. Attached to the end of the outer surface with a conductive adhesive or the like. Also in this case, the terminal 24 is connected to the lens device 7 and set to a predetermined potential of the digital camera 1 as in the case of the first embodiment.

  FIG. 10 is an exploded perspective view of the diaphragm device according to the second embodiment. The diaphragm device 56 shown in the figure includes a substrate 57, a spacer 58, a light shielding curtain 59, and a plate-like member 60 shown from the bottom of the figure. The substrate 57 and the spacer 58 shown in the figure have the same configuration as the substrate 49 and the spacer 51 shown in FIG.

The light-shielding curtain 59 forms a stop, except that an optical opening 62 having a diameter smaller than the diameter of the optical opening 61 of the plate-like member 60 is formed at the center thereof. The configuration is the same as that of the light-shielding curtain 52 shown in FIG.
The plate-like member 60 of this example is configured with a metal sheet member 63 as a base material. In this case, the optical opening 61 is a physical opening formed through the metal sheet member 63. is there. Further, this metal sheet member 63 is subjected to antireflection treatment by, for example, black painting or plating except for the terminal 24 described later.

Further, the terminal 24 of the plate member 60 is formed so as to extend integrally from the metal sheet member 63. Also in this case, the terminal 24 is connected to the lens device 7 and is set to a predetermined potential of the digital camera 1.
The driving principle of this diaphragm device is also the same as the driving principle of the shutter device described with reference to FIGS.

  FIG. 11 is an exploded perspective view of the lens shutter device according to the fourth embodiment. As shown in the figure, the lens shutter device 64 includes a first substrate 65, a first spacer 67, a first light shielding curtain 68, a plate-shaped member 69, a second light shielding curtain 71, a first light shielding curtain 71, a first light shielding curtain, and the like. 2 spacers 72 and a second substrate 73. Each member of this configuration is formed point-symmetrically with respect to the center point of the optical opening 74 of the plate-like member 69 disposed at the center.

  The first substrate 65 is made of a transparent member such as a glass plate, for example, and a strip electrode 77 is provided on the entire inner surface excluding the optical opening 75 and the light-shielding curtain non-moving portion 76. Similarly, the second substrate 73 is made of a transparent member such as a glass plate, and is optically symmetrical with respect to the center point of the optical opening 74 of the plate-like member 69 with respect to the first substrate 65. A strip-shaped electrode 81 is provided on the entire inner surface except for the opening 78 and the light-shielding curtain non-moving portion 79.

  The first spacer 67 is disposed between the first substrate 65 and the plate member 69 in order to maintain a gap in which the first light shielding curtain 68 can move. Similarly, the second spacer 72 is arranged between the second substrate 73 and the plate-like member 69 in order to maintain a gap in which the second light-shielding curtain 71 can move.

  The first and second light-shielding curtains 68 and 71 are preliminarily provided with electrets that are electrically polarized at a desired pitch, similarly to the mover 39 described with reference to FIGS. Portions that overlap each other across 69 are formed symmetrically with respect to the center point of the optical opening 74 of the plate-like member 69 and are cut out in a triangular shape.

Thus, an optical aperture having a desired size can be obtained by adjusting the distance between the triangular valley 68-1 and the valley 71-1 by setting movement before the start of photographing.
The plate-like member 69 in this example uses a metal sheet as a base material, the optical opening 74 that is physically formed by drilling in order to limit the light flux, and the end part integrally with the base material. A terminal portion 82 is provided that is bent at a right angle and protrudes. The terminal portion 82 is also connected to the lens device in this case, and is set to a predetermined potential of the digital camera 1.

  FIG. 12 (a) is an enlarged perspective view of the lens device 7 ′ in which the lens shutter device 64 is incorporated as seen from the back side of the digital camera 1 shown in FIG. 1 (b), and FIG. It is a figure which shows the lens shutter apparatus 64 independently. FIG. 4A shows a connection form between the lens shutter device 64 and the metal chassis 25 of the lens device 7 ′, and the same components as those shown in FIG. ) And the same number are given.

  As shown in FIG. 12A, the lens shutter device 64 shown in FIG. 11 is incorporated in the lens device 7 ′ at the shutter (aperture) position. Since this lens shutter device 64 is a diaphragm shutter having two light-shielding curtains 68 and 71 as shown in FIG. 11, the longitudinal direction of the rectangle is the case of the shutter device 21 of FIGS. 3 (a) and 3 (b). Longer than.

  Therefore, at the time of incorporation, the lens shutter device 64 main body alone has the full frame width of the metal chassis 25 of the lens device 7 ′, so that the terminal portion 82 is perpendicular to the lens shutter device 64 main body end as described above. As a bent shape, the terminal portion 82 is accommodated in the metal chassis 25. In this state, the chassis connection terminal 26 and the terminal portion 82 of the lens shutter device 64 are connected via a lead wire 27 by soldering or a conductive adhesive.

  Further, as described above, since the lens shutter device 64 has only the main body portion to be the full size of the frame of the metal chassis 25 of the lens device 7 ', the guide shaft for guiding the movement of each movable lens frame is divided into two parts. 83-1 and 83-2. The upper guide shaft 83-1 is supported by the first fixed lens frame 8 in a cantilevered state in the upper part of the figure, and the lower guide shaft 83-2 is a second fixed lens frame in the cantilevered state in the lower part of the figure. Supported by the portion 17.

In this embodiment, the plate-like member 69 is made of a metal sheet. However, as in Embodiment 1 or 2, it can be made of plate glass or a conductive resin sheet. In that case, a separate terminal may be attached to the plate member with a conductive adhesive.
Moreover, in Examples 1-4 mentioned above, although the spacer is made into frame shape, if the space | interval of a board | substrate and a plate-shaped member can be maintained so that a light-shielding curtain can move, it is not limited to frame shape. For example, it may be a U-shaped or D-shaped arrangement. Alternatively, it is needless to say that the spacer can be deleted if the space between the substrate and the plate-like member can be maintained without a spacer by an assembly jig or the like.

(a), (b) is a figure which shows schematic structure of the digital camera in which the lens apparatus provided with the shutter apparatus as a light quantity adjustment apparatus of Example 1 is integrated. FIG. 2 is a diagram illustrating a schematic configuration of each part of a lens unit when a cross section taken along the line AA ′ of the lens apparatus according to the first embodiment is viewed from the left side of the digital camera. (a) is the expansion perspective view which looked at the lens apparatus concerning Example 1 from the back side of a digital camera, (b) is the figure which shows the shutter apparatus independently. (a) is a disassembled perspective view of the shutter device of Example 1, and (b) is a B arrow view of the member shown at the top. (a), (b) is a figure explaining the drive principle of the shutter mechanism in the shutter apparatus of this invention. It is a figure which shows typically an electret shutter and its drive circuit. It is a figure which shows the voltage signal row | line | column produced | generated by the drive circuit of an electret shutter and applied to a strip | belt-shaped electrode. It is a figure which further demonstrates operation | movement of an electret shutter. FIG. 6 is an exploded perspective view of a shutter device as a second embodiment. It is a disassembled perspective view of the aperture_diaphragm | restriction apparatus as Example 3. FIG. FIG. 6 is an exploded perspective view of a lens shutter device as Example 4. (a) is a figure which shows the connection form of the lens shutter apparatus of Example 4, and the metal chassis of a lens apparatus, (b) is a figure which shows the lens shutter apparatus independently.

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 shift part 11 First movable 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 Imaging element 20 Shutter position (aperture position)
DESCRIPTION OF SYMBOLS 21 Shutter device 22 Optical opening part 23 Retraction | saving part 24 Terminal 25 Metal chassis 26 Chassis connection terminal 27 Lead wire 28 Board | substrate 29 Spacer 29-1 Notch part 31 Light-shielding curtain 31-1 Notch part 32 Plate-shaped member 33 Optical opening Part 34 Peripheral part 35 Strip electrode (drive electrode)
36 Optical opening 37 Light-shielding member 38 Stator 39 Moving element 41 Optical opening 42 Strip electrode (drive electrode)
43 Drive circuit 44 Dielectric (electret)
45 Pulse generation circuit 46 Booster circuit 47 Phaser 48 Shutter device 49 Substrate 51 Spacer 52 Light-shielding curtain 53 Plate member 54 Optical opening 55 Light-shielding conductive resin sheet member 56 Lens shutter device 57 Substrate 58 Spacer 59 Light-shielding curtain 60 Plate -Like member 61 Optical opening 62 Optical opening 63 Metal sheet member 64 Lens shutter device 65 First substrate 66 First spacer 68 First light-shielding curtain 69 Plate-like member 71 Second light-shielding curtain 72 Second Spacer 73 Second substrate 74, 75, 78 Optical opening 76, 79 Light-shielding curtain non-moving portion 77, 82 Strip electrode (drive electrode)
83-1, 83-2 Guide shaft

Claims (11)

Between the base electrode provided with the strip electrode for driving the light shielding curtain and the optical opening, the light shielding curtain that is electrically polarized in advance at a desired pitch, and the substrate having the optical opening. In a light amount adjusting device configured by laminating a plate-like member that maintains the light-shielding curtain movably in the gap formed in
The plate-like member has a surface facing the light-shielding curtain having conductivity and is fixed at a predetermined potential.
A light quantity adjusting device characterized by that.   The light quantity adjusting device according to claim 1, wherein the plate-like member exists at least in a movable range of the light shielding curtain.   The light amount adjusting device according to claim 1, wherein the plate-like member has a surface having the conductivity connected to a predetermined potential of a device in which the light amount adjusting device is incorporated.   The light amount adjusting device according to claim 1, wherein the plate-like member is connected to a ground of a device in which the light amount adjusting device is incorporated.   2. The light amount adjusting device according to claim 1, wherein the plate-like member has a connection portion for connecting to a predetermined potential or ground of a device in which the light amount adjusting device is incorporated.   The light quantity adjusting device according to claim 1, wherein the plate-like member is a glass plate whose surface other than the optical opening is covered with a light-shielding member having conductivity.   The plate-like member is a glass thin plate in which a transparent conductive member is provided in the optical opening and a portion other than the optical opening is covered with a light-shielding member having conductivity. 1. The light amount adjusting device according to 1.   The light quantity adjusting device according to claim 1, wherein the plate-like member is a light-shielding conductive resin sheet member provided with the optical opening.   The light quantity adjusting device according to claim 1, wherein the plate-like member is a metal sheet member provided with the optical opening.   The light quantity adjusting device according to claim 9, wherein the metal sheet member is subjected to an antireflection treatment. 11. A camera comprising the light amount adjusting device according to claim 1 at a shutter or aperture position of an optical system.

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