JP2005316328A - Light quantity adjusting device and camera using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light quantity adjusting device using two light shielding curtains having the same size and preventing the driving signals of strip electrodes for driving the respective light shielding curtains from interfering with each other. <P>SOLUTION: In a shutter device 4, a 1st base plate 8 which is transparent, to which light shielding treatment such as coating 16 is performed to all the surface except an optical aperture part 15 and which is provided with the strip electrodes 18 on a back surface, a 1st spacer 9 housing a 1st light shielding curtain 10 movably in a frame, an interference preventing member 11, a 2nd spacer 13 housing a 2nd light shielding curtain 12 movably, and a 2nd base plate 14 equipped with strip electrodes 22 at a part except an optical aperture part 19 are laminated in a tight contact state. The 1st light shielding curtain 10 is driven by the strip electrodes 18 of the 1st base plate 8, and the 2nd light shielding curtain 12 is driven by the strip electrodes 22 of the 2nd base plate 14. The interference preventing member 11 is a transparent plate glass and has insulating property and made to intervene between the 1st light shielding curtain 10 and the 2nd light shielding curtain 12, whereby a situation that the driving signals of the strip electrodes 18 of the 1st base plate 8 and the strip electrodes 22 of the 2nd base plate 14 exert influence on the driving of the 2nd light shielding curtain 12 and the 1st light shielding curtain 10 is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light amount adjusting device that drives two electret-type or inductive charge-type light shielding curtains in a state in which mutual interference is reduced by corresponding strip electrodes, and a camera using the same.

Conventionally, an example in which an inductive charge type actuator is applied as a method of driving two light shielding curtains such as a focal plane shirt of a camera has been proposed. (For example, refer to Patent Document 1.)
This technology moves two sliders (movers) arranged opposite to each band electrode by moving the induced charges of the band electrodes provided on both sides of one stator (stator). I am letting. The two sliders are intended to function as shutter curtains and diaphragm blades.
Japanese Patent Application Laid-Open No. 08-220592 ([0011], FIG. 2)

  By the way, in the configuration of the above-mentioned patent document 1, since the strip electrodes are provided on both surfaces of one stator located in the middle, the drive signals of the strip electrodes on both surfaces are easily interfered with each other, that is, the slider is on the opposite strip electrode. Therefore, the slider may not be driven with high accuracy.

In order to avoid this problem, in Patent Document 1, one of the strip-like electrodes on the front and back of the stator is arranged at a position close to the optical opening, and the other is shifted to a position outside of the optical opening. It is arranged to reduce interference between the strip electrodes on both sides.
However, when the strip electrodes on the front and back surfaces of the stator are shifted inward and outward with respect to the optical opening, the slider driven by the strip electrode shifted to one outer position is displaced outward. As a result, the size of the shutter device is increased, which causes a problem of hindering the downsizing of the camera.

  SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional situation, and a light amount adjusting device in which two light-shielding curtains are configured to have the same size and a driving signal of a strip electrode driving each of them is not interfered, and a camera using the same Is to provide.

  First, a light amount adjusting device according to a first aspect of the present invention is driven by a first substrate having an optical opening and a strip electrode, electrically polarized in advance at a desired pitch, and the strip electrode on the first substrate. A first light-shielding curtain, a second light-shielding curtain electrically polarized in advance at a desired pitch, and a second substrate having a strip electrode and an optical opening for driving the second light-shielding curtain; In the light quantity adjusting device stacked in this order, the signal applied to the strip electrode of the first substrate to drive the first light shielding curtain affects the driving of the second light shielding curtain. And a signal applied to the strip electrode of the second substrate to drive the second light shielding curtain is provided so as to reduce the influence on the driving of the first light shielding curtain. An interference preventing member is provided.

The interference preventing member is an insulating member provided with an optical opening, for example, and is configured to be disposed between the first light shielding curtain and the second light shielding curtain.
The interference preventing member is, for example, an insulating member provided with an optical opening, and is preferably provided at least on the side of the first light shielding curtain or the second light shielding curtain facing each other.

In addition, the interference prevention member is, for example, a conductive material provided with an optical opening, and is disposed between the first light shielding curtain and the second light shielding curtain, and a device in which a light amount adjusting device is incorporated. You may comprise so that it may be connected to the earthing | grounding side.
In this case, the interference prevention member may be formed of, for example, a glass plate whose surface other than the optical opening is covered with a light-shielding member having conductivity. While providing the member, the portion other than the optical opening may be constituted by a glass plate covered with a light-shielding member having conductivity, and for example, a light-shielding conductive resin sheet member provided with an optical opening. For example, it may be constituted by a metal sheet member provided with an optical opening. Thus, when comprised with a metal sheet member, it is preferable that the antireflection process is performed, for example.

  Next, a camera according to a second aspect of the present invention is configured by including any of the light amount adjusting devices described above at a shutter position of an optical system.

According to one method of the present invention, since the insulating interference preventing member is disposed between the first light shielding curtain and the second light shielding curtain, the first light shielding curtain has the influence of the second strip electrode. It is possible to reduce the receiving and reduce the influence of the second light shielding curtain on the influence of the first strip electrode.
Further, according to another method of the present invention, the conductive interference preventing member is disposed between the first light shielding curtain and the second light shielding curtain and connected to the ground side of the device in which the light amount adjusting device is incorporated. It is possible to reduce the influence of the first light shielding curtain from the influence of the second strip electrode and to reduce the influence of the second light shielding curtain from the influence of the first stripe electrode.

  In any case, since it is not necessary to dispose the strip electrode shifted from the center of the substrate to the outside, the apparatus can be miniaturized.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 (a) is a front view with the lens of the camera body incorporating the focal plane shutter device as the light quantity adjusting device of the present invention removed, and FIG. 1 (b) is a front view of the lens. c) is a diagram showing the configuration of the innermost part behind the focal plane shutter device shown in FIG.

  The camera body 1 shown in FIG. 6A shows an internal configuration behind the lens by removing the interchangeable lens 3 shown in FIG. In the internal configuration shown in FIG. 5A, a focal plane shutter device 4 as Example 1 is incorporated in the vicinity of the subject side of the focal plane. In the figure, the central portion of the focal plane shutter device 4 is visible. In FIG. 2A, the quick return mirror originally disposed in front of the focal plane shutter device 4 is not shown in order to facilitate the illustration. The camera body 1 has a grip portion 5 that also serves as a battery chamber on the left side of the figure, and includes a shutter button 6 on the upper surface thereof.

  As shown in FIG. 2C, the rear structure of the camera body 1 in which the focal plane shutter device 4 is further removed from the internal structure behind the lens has the light receiving surface 7 of the image sensor disposed at the innermost part. .

  FIG. 2 (a) is an exploded perspective view of the focal plane shutter device 4 as the first embodiment, and FIG. 2 (b) is a view as seen from an arrow A in FIG. 2 (a). As shown in FIG. 6A, the focal plane shutter device 4 of this example includes a first substrate 8, a first spacer 9, a first light-shielding curtain 10, and interference prevention shown from the left in FIG. The member 11, the second light shielding curtain 12, the second spacer 13, and the second substrate 14 are configured.

  The first substrate 8 is made of a transparent member such as a glass plate, for example. The outer surface after assembly is light-shielded by, for example, black coating 16 on the entire surface except the optical opening 15. Also, on the inner surface after assembly, as shown in FIG. 2B, a strip electrode 18 (drive electrode) is provided on the entire surface excluding the optical aperture 15 and the light-shielding curtain non-moving portion 17. Yes.

Similarly, the second substrate 14 is made of a transparent member such as a glass plate, and is symmetrical with respect to the center point of the interference preventing member 11 with respect to the first substrate 7 and has an optical opening 19 and a light shielding curtain. A belt-like electrode 22 is provided on the entire inner surface except for the non-moving part 21.
The first spacer 9 is arranged to maintain a gap in which the first light-shielding curtain 10 can move between the first substrate 8 and the interference prevention member 11. Similarly, the second spacer 13 is disposed between the second substrate 14 and the interference preventing member 11 so as to maintain a gap in which the second light-shielding curtain 12 can move.

  The first light-shielding curtain 10 and the second light-shielding curtain 12 will be described later in detail, but are electretized in advance at a desired pitch, and the first spacer 9 and the second spacer, respectively. 13 is inserted into the frame 13, and the optical path of the optical openings 15 and 19 is interrupted in some cases by the belt-like electrode 18 of the first substrate 8 and the belt-like electrode 22 of the second substrate 14. To be driven.

The interference prevention member 11 of this example is formed of a transparent plate glass, and is disposed between the first light shielding curtain 10 and the second light shielding curtain 12.
As described above, the insulating interference preventing member 11 is interposed between the first light shielding curtain 10 and the second light shielding curtain 12, so that the belt-like electrode 18 and the second substrate 14 provided on the first substrate 8 are provided. It is possible to reduce the influence of the drive signal applied to the strip-shaped electrode 22 provided on the second light-shielding curtain 12 and the first light-shielding curtain 10 respectively.

Here, the driving principle of the shutter mechanism that drives the light-shielding curtain in the focal plane shutter device 4 of this example will be described. This driving principle is common to the shutter device of the present invention described as Examples 2 to 7 below.
3A and 3B are diagrams for explaining the driving principle of the shutter mechanism in the shutter device of the present invention. In the following description of the drive principle, the first or second substrate is referred to as the stator 23, and the first or second light shielding curtain is referred to as the mover 24.

  The shutter mechanism basically includes a stator 23 and a mover 24, and the mover 24 is configured to be movable in the left-right direction with respect to the stator 23 as shown in FIGS. Has been. The stator 23 is provided with an opening (optical opening 25) for guiding a light image from the subject to the light receiving surface of the image sensor (see the light receiving surface 7 of the image sensor in FIG. 5C). Further, a plurality of strip electrodes 26 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 shutter mechanism described above, when positive and negative voltages are periodically applied to the strip electrode 26, an attractive force or a repulsive force is generated between the strip electrode 26 and the electret of the moving element 24. As a result, the moving element 24 It moves relative to the stator 23.
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 25) of the stator 23. FIG. 3A shows a state where the shutter is open, and FIG. 3B 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 25) of the stator 23 is not necessarily a physical opening such as a through-hole, and the stator 23 is used as a transmission member, and a strip electrode is provided at a position corresponding to the opening. It is also possible to form a transmissive region in which 26 is not provided.
FIG. 4 is a diagram schematically showing an electret shutter and its drive circuit according to the shutter device of the present invention. 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 27 is connected to each strip electrode 26 arranged on the stator 23. A four-phase voltage signal is applied to the voltage signal line. Therefore, the same voltage signal is applied to the strip electrode 26 every four lines. In FIG. 4, the voltage signals are distinguished by attaching the symbols A, B, C, and D to the strip electrode 26.

A moving element 24 is arranged to face the surface of the stator 23 where the strip electrode 26 is provided. The mover 24 includes a plurality of the above-described dielectrics (electrets) 28 (typically 28 a and 28 b in FIG. 4) that are permanently polarized on the surface facing the stator 23.
In the drive circuit 27 shown on the left side of the figure, the pulse generation circuit 29-1 generates a rectangular wave train (drive pulse signal), and this drive pulse signal is supplied to the booster circuit 29-2 and the phase shifter 29-3. . In the step-up circuit 29-2, the input drive pulse signal is stepped up to about 100V, branched into voltage signals having two polarities, and supplied to the strip electrodes A and C.

On the other hand, the drive pulse signal input to the phase shifter 29-3 has a waveform delayed by 90 °, and is then input to the booster circuit 29-2 and branched into voltage signals having the same two polarities as described above. Supplied to the strip electrodes B and D.
FIG. 5 is a diagram showing a voltage signal sequence generated by the drive circuit 27 and applied to the strip electrode 26. As for the voltage state of the strip electrode 26, 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. 6 is a diagram for further explaining the operation of the electret shutter. FIG. 5A shows the state of the electret and the strip electrode immediately after the voltage state of each strip electrode 26 (A, B, C, D) in FIG. 5 is switched to the applied voltage state at t1 shown in FIG. The correspondence is shown.
The electret 28 a receives a repulsive force from the strip electrode A and receives a suction force from the strip electrode B. The electret 28 b receives a repulsive force from the strip electrode C and receives a suction force from the strip electrode D. For this reason, the moving element 24 receives a force in the right direction of the figure and moves by one band electrode pitch d.

  FIG. 6B 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. 5 following the above. The electret 28 a receives a repulsive force from the strip electrode B and receives a suction force from the strip electrode C. The electret 28 b receives a repulsive force from the strip electrode D and receives a suction force from the strip electrode A. For this reason, the movable element 24 receives a force in the right direction in the figure and moves again by one band electrode pitch d.

  FIG. 6 (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. 5 following the above, and FIG. ), The corresponding relationship between the electret and the strip electrode immediately after switching to the state of the applied voltage at t4 shown in FIG. 5 is shown. Similar to the operation described in FIGS. 6A and 6B, the moving element 24 sequentially moves by one band-like electrode pitch d.

Then, by repeating this operation, the mover 24 moves to the right in the figure. In order to move the movable element 24 in the left direction in the figure, the polarity of the voltage applied to the strip electrode 26 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.

  FIG. 7 is an exploded perspective view of the focal plane shutter device according to the second embodiment. In this figure, members having the same configuration as in FIG. 2 (a) are given the same numbers as in FIG. 2 (a). That is, the focal plane shutter device 30 shown in FIG. 7 includes a first substrate 8, a first spacer 9, a first light-shielding curtain 10, and the structure shown in FIG. ), The second light shielding curtain 12, the second spacer 13, and the second substrate 14 having the same configuration as that shown in FIG.

  The interference prevention member 31 of this example is a frame-shaped resin member having insulating properties, and by setting an appropriate plate thickness, the first light-shielding curtain 10 and the second light-shielding curtain 12 are spaced at an appropriate interval. The drive signals applied to the strip electrodes provided on the first substrate 8 and the second substrate 14 can affect the driving of the second light shielding curtain 12 and the first light shielding curtain 10, respectively. Can be reduced.

  FIG. 8 is an exploded perspective view of the focal plane shutter device as the third embodiment. Also in this figure, members having the same configuration as in FIG. 2A are given the same numbers as in FIG. The focal plane shutter device 32 shown in FIG. 8 includes a first substrate 8, a spacer 33, a first light-shielding curtain 10, an interference prevention member 34, and a second fixed integrally to the interference prevention member 34 from the left in FIG. The light shielding curtain 12 and the second substrate 14.

The interference preventing member 34 has a U-shaped frame shape made of an insulating resin member, and is fixed to a surface of the second light shielding curtain 12 facing the first light shielding curtain 10.
The spacer 33 has a frame thickness within which the first light-shielding curtain 10 and the second light-shielding curtain 12 to which the interference preventing member 34 is fixed are movably accommodated.

  In the configuration of this example, by appropriately setting the plate thickness of the interference preventing member 34, the first light shielding curtain 10 and the second light shielding curtain 12 can be adjusted to an appropriate interval. It can be reduced that the drive signals applied to the strip electrodes provided on the substrate 8 and the second substrate 14 affect the driving of the second light shielding curtain 12 and the first light shielding curtain 10, respectively.

  The interference prevention member 34 is fixed to the second light shielding curtain 12 in this example, but the present invention is not limited to this, and the surface of the first light shielding curtain 10 faces the second light shielding curtain 12. It may be fixed. Although the interference preventing member 34 has a U-shape, the present invention is not limited to this, and may be a rectangular frame similar to the spacer 33 (however, slightly smaller than the spacer 33). You may make it shape and fix to a light-shielding curtain.

(Examples 4 to 7)
FIGS. 9A and 9B are diagrams illustrating a schematic configuration of a digital camera in which a lens device including a lens shutter device as a light amount adjusting device of Examples 4 to 7 is incorporated. FIG. 4A shows an external perspective view of the digital camera from the front, and FIG. 4B shows a perspective view of the arrangement of main parts inside the digital camera.

As shown in FIG. 2A, the digital camera 35 includes a photographing lens window 36 at the upper right corner of the front surface and a strobe irradiation window 37 on the left side thereof. A release button 38 is provided at the left end of the upper surface.
As shown in FIG. 6B, the interior of the digital camera 35 occupies approximately 2/3 of the left side of the whole. Etc. are arranged. A unitized lens device 42 is disposed in a portion that occupies approximately 1/3 of the entire right side.

  The lens device 42 bends the light beam from the subject incident along the photographing optical axis O1 shown in FIG. 5B from the photographing lens window 36 shown in FIG. The incident light flux is guided to an imaging device such as a CCD disposed at the lower end portion of the lens device 42 along a second optical axis O2, which will be described later and bent downward. To generate a captured image.

  FIG. 10 is a cross-sectional view taken along the line AA ′ of the lens device 42 shown in FIG. 9B as viewed from the left side of FIG. 9B of the digital camera 35. Show. Inside the lens device 42 shown in FIG. 9B, as shown in FIG. 10, a lens is attached to the first fixed lens frame portion 43 along the second optical axis O2 bent downward. The first fixed lens unit 44 holding the group, the first moving lens unit 46 holding the lens group in the first moving lens frame 45, and the first lens holding the lens group in the second moving lens frame 47. The second moving lens unit 48, the third moving lens unit 51 holding the lens in the third moving lens frame 49, and the second fixed lens unit 53 holding the lens in the second fixed lens frame unit 52. Is provided. And the image pick-up element 54 is arrange | positioned at the terminal of these lens parts.

  The first moving lens unit 46 and the second moving lens unit 48 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 42, that is, the zoom ratio. The third moving lens unit 51 is provided for adjustment, and is provided for focus adjustment in which the light beam forms an image on the image sensor 54. A shutter position (also an aperture position) 55 is provided between the first moving lens unit 46 and the second moving lens unit 48.

  FIG. 11 (a) is an enlarged perspective view of the lens device 42 shown in FIG. 9 (b) as seen from the back side of the digital camera 35 in FIG. 9 (b), and FIG. FIG. As shown in FIG. 11A, a lens shutter device 56 as Example 4 is incorporated in the lens device 42 at the shutter position (aperture position) 55 shown in FIG. As shown in FIG. 11B, the lens shutter device 56 is a device that forms a slightly rectangular flat plate-like body.

The imaging element 54 shown in FIG. 10 is also disposed at the end of the second optical axis O2 that passes through an optical opening 66 (65, 69) described later of the lens shutter device 56, that is, at the lower end of the lens device 42. Has been.
FIG. 12 is an exploded perspective view of the lens shutter device 56 as the fourth embodiment. As shown in the figure, the lens shutter device 56 includes a first substrate 57, a first spacer 58, a first light-shielding curtain 59, an interference preventing member 61, a second light-shielding curtain 62, a second light-shielding curtain 62, and the like. 2 spacers 63 and a second substrate 64. Each member of this configuration is formed point-symmetrically with respect to the center point of the optical opening 65 of the interference preventing member 61 disposed at the center.

  The first substrate 57 is made of a transparent member such as a glass plate, for example, and a strip electrode 68 is provided on the entire inner surface except for the optical opening 66 and the light-shielding curtain non-moving portion 67. Similarly, the second substrate 64 is also made of a transparent member such as a glass plate, and is optically symmetrical with respect to the first substrate 57 with respect to the center point of the optical opening 65 of the interference preventing member 61. A strip-shaped electrode 72 is provided on the entire inner surface except for the opening 69 and the light-shielding curtain non-moving portion 71.

  The first spacer 58 is disposed between the first substrate 57 and the interference preventing member 61 so as to maintain a gap in which the first light shielding curtain 59 can move. Similarly, the second spacer 63 is disposed between the second substrate 64 and the interference preventing member 61 so as to maintain a gap in which the second light-shielding curtain 62 can move.

  The first and second light-shielding curtains 59 and 62 are preliminarily provided with electrets that are electrically polarized at a desired pitch, similarly to the moving element 24 described with reference to FIGS. The portions overlapping each other across 61 are formed symmetrically with respect to the center point of the optical opening 65 of the interference preventing member 61 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 59-1 and the valley 62-1 by setting movement before the start of photographing.
The interference preventing member 61 in this example is formed of an insulating resin sheet. As described above, the insulating interference preventing member 61 is interposed between the first light shielding curtain 59 and the second light shielding curtain 62, so that the strip electrodes provided on the first substrate 57 and the second substrate 64 are provided. It can be reduced that the drive signals applied to 68 and 72 affect the driving of the second light shielding curtain 62 and the first light shielding curtain 59, respectively.

(Examples 5-7)
FIG. 13 (a) is an enlarged perspective view of the lens device 42 according to the fifth to seventh embodiments shown in FIG. 9 (b) as seen from the back side of FIG. 9 (b) of the digital camera 35. b) is a diagram showing the lens shutter device alone.

  As shown in FIG. 13A, the lens device 42 has lens shutter devices 75 (75-1, 75-2, 75-2, and 75-2) according to Examples 5 to 7 at the shutter position (aperture position) 55 shown in FIG. 75-3) is incorporated. As shown in FIG. 13 (b), the lens shutter device 75 has a slightly rectangular flat plate-like body, and a shutter device terminal 76 that is bent downward at a right angle is provided at the end in the longitudinal direction. It has been.

  In the lens device 42, as shown in FIG. 13A, a chassis connection terminal 78 is provided in the vicinity of the shutter position (aperture position) 55 shown in FIG. The chassis connection terminal 78 and the shutter device terminal 76 are connected via a lead wire 79. These connections are made by soldering or conductive adhesive.

  FIG. 14 is an exploded perspective view of the lens shutter device according to the fifth embodiment. In the figure, members having the same configuration as in FIG. 12 are given the same numbers as in FIG. That is, the lens shutter device 75-1 shown in FIG. 14 has the same structure as that of FIG. 12 from the left in FIG. 14, the first substrate 57, the first spacer 58, the first light shielding curtain 59, and FIG. An interference prevention member 81 having a different configuration, a second light-shielding curtain 62 having the same configuration as that shown in FIG. 12, a second spacer 63, and a second substrate 64 are included.

  The interference prevention member 81 of this example is composed of an optical opening 82 that restricts a light beam and a metal sheet on which a terminal portion (shutter device terminal 76) is formed at the end. As shown in FIG. 13, the terminal portion (shutter device terminal 76) is connected to the metal chassis 77 of the lens device 42 via the lead wire 79 and the chassis connection terminal 78, and the lens device 42 is connected to the circuit board 39. Connected to ground.

  As described above, the conductive interference preventing member 81 connected to the ground of the main body device is interposed between the first light shielding curtain 59 and the second light shielding curtain 62, so that the first substrate 57 and the second substrate Drive signals applied to the strip electrodes 68 and 72 provided on the substrate 64 are absorbed by the interference prevention member 81 before affecting the driving of the second light shielding curtain 62 and the first light shielding curtain 59, respectively. Thus, the influence of the drive signals applied to the strip electrodes 68 and 72 on the driving of the second light shielding curtain 62 and the first light shielding curtain 59 can be reduced.

  FIG. 15 is an exploded perspective view of the lens shutter device according to the sixth embodiment. In this figure, members having the same configuration as in FIG. 12 are given the same numbers as in FIG. In FIG. 15, the lens shutter device 75-2 includes a first substrate 57 and a cutout portion 58'-1 having the same configuration as those in FIG. 12 from the left in FIG. Spacer 58 ′, first light shielding curtain 59, interference preventing member 83 having a configuration different from that of FIG. 12, second light shielding curtain 62, second spacer 63, and second substrate 64 having the same configuration as FIG. It is configured.

  The interference prevention member 83 of this example is composed of a conductive resin sheet in which an optical opening 84 that restricts the luminous flux is formed, and a shutter device terminal 76 ′ that is bent at a right angle and protrudes at an end thereof. It is fixed with a conductive adhesive. A notch 58′-1 formed at one corner of the first spacer 58 ′ is provided in order to avoid interference with the adhesion portion of the shutter device terminal 76 ′ to the interference preventing member 83.

As the conductive resin sheet constituting the interference prevention member 83, for example, Soma Black (registered trademark) film (product number: Soma B-H50MDED, manufactured by Somaru Corporation, ED means conductivity) is used.
Also in this case, the shutter device terminal 76 ′ is connected to the metal chassis 77 of the lens device 42 via the lead wire 79 and the chassis connection terminal 78 as shown in FIG. Is connected to the ground of the circuit board 39.

  Also in this case, the conductive interference preventing member 83 connected to the ground of the main body device is interposed between the first light shielding curtain 59 and the second light shielding curtain 62, so that the first substrate 57 and the second substrate The drive signals applied to the strip electrodes 68 and 72 provided on the substrate 64 are shielded by the interference preventing member 83 before affecting the driving of the second light shielding curtain 62 and the first light shielding curtain 59, respectively. The influence can be reduced.

  FIG. 16 is an exploded perspective view of the lens shutter device according to the seventh embodiment. In the figure, members having the same configuration as in FIG. 15 are given the same numbers as in FIG. In FIG. 16, the lens shutter device 75-3 includes a first substrate 57, a first spacer 58 ′ having a cutout portion 58′-1 having the same configuration as that in FIG. 59, an interference preventing member 85 having a configuration different from that shown in FIG. 15, a second light shielding curtain 62, a second spacer 63, and a second substrate 64 having the same configuration as those shown in FIG.

  The interference prevention member 85 of this example is made of a transparent plate, and is provided with a light shielding portion 87 by conductive coating or metal vapor deposition at a portion other than the optical opening 86 that restricts the central light beam. . A shutter device terminal 76 ′ protruding at a right angle is fixed to the end portion by a conductive adhesive. The shutter device terminal 76 is also connected to the metal chassis 77 of the lens device 42 via the lead wire 79 and the chassis connection terminal 78 in the same manner as in the fifth and sixth embodiments, and the lens device 42 is connected to the ground of the circuit board 39. Connected.

  In this case as well, the conductive interference preventing member 85 connected to the ground of the main body device is interposed between the first light shielding curtain 59 and the second light shielding curtain 62, so that the first substrate 57 and the second substrate The driving signals applied to the strip electrodes 68 and 72 provided on the second substrate 64 are shielded by the interference preventing member 85 before they affect the driving of the second light shielding curtain 62 and the first light shielding curtain 59, respectively. Thus, the influence can be reduced.

(a) is a front view with the lens of the camera body incorporating the focal plane shutter device as the light quantity adjusting device of the present invention removed, (b) is a front view of the lens, and (c) is the focal plane shutter of (a). It is a figure which removes an apparatus and shows the structure of the innermost part behind it. (a) is a disassembled perspective view of the focal plane shutter device of Embodiment 1, and (b) is a view as seen from an arrow A in (a). (a), (b) is a figure explaining the drive principle of the shutter mechanism of the shutter apparatus of this invention. It is a figure which shows typically the electret shutter concerning the shutter apparatus of this invention, 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. It is a disassembled perspective view of the focal plane shutter device as Example 2. FIG. 10 is an exploded perspective view of a focal plane shutter device as Example 3. (a), (b) is a figure which shows schematic structure of the digital camera in which the lens apparatus provided with the lens shutter apparatus as a light quantity adjustment apparatus of Example 4 is integrated. 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 concerning Example 4 from the left side of a digital camera. (a) is the expansion perspective view which looked at the lens apparatus concerning Example 4 from the back side of the digital camera, (b) is the figure which shows the shutter apparatus independently. FIG. 6 is an exploded perspective view of a lens shutter device as Example 4. (a) is the expansion perspective view which looked at the lens apparatus concerning Examples 5-7 from the back side of the digital camera, (b) is the figure which shows the lens shutter apparatus independently. FIG. 10 is an exploded perspective view of a lens shutter device as Example 5. FIG. 10 is an exploded perspective view of a lens shutter device as Example 6. FIG. 10 is an exploded perspective view of a lens shutter device as Example 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2 Interchangeable lens attachment part 3 Interchangeable lens 4 Focal plane shutter apparatus 5 Grip part 6 Shutter button 7 Image pick-up element light-receiving surface 8 1st board | substrate 9 1st spacer 10 1st light shielding curtain 11 Interference prevention member 12 2nd Light shielding curtain 13 second spacer 14 second substrate 15 optical opening 16 coating 17 light shielding curtain non-moving portion 18 strip electrode (drive electrode)
19 Optical opening 21 Shading curtain non-moving part 22 Strip electrode (drive electrode)
23 Stator 24 Mover 25 Optical opening 26 Strip electrode (drive electrode)
27 Drive (voltage application) circuit 28 (28a, 28b) Dielectric (electret)
29-1 Pulse generation circuit 29-2 Boosting circuit 29-3 Phaser 30 Focal plane shutter device 31 Interference prevention member 32 Focal plane shutter device 33 Spacer 34 Interference prevention member 35 Digital camera 36 Shooting lens window 37 Strobe irradiation window 38 Release button 39 Circuit board 41 Battery 42 Lens device O2 Second optical axis 43 First fixed lens frame portion 44 First fixed lens portion 45 First moving lens frame 46 First moving lens portion 47 Second movement Mirror frame 48 Second moving lens unit 49 Third moving lens frame 51 Third moving lens unit 52 Second fixed lens frame unit 53 Second fixed lens unit 54 Image sensor 55 Shutter position (also aperture position)
DESCRIPTION OF SYMBOLS 56 Lens shutter apparatus 57 1st board | substrate 58, 58 '1st spacer 58'-1 Notch part 59 1st light-shielding curtain 59-1 Triangular valley 61 Interference prevention member 62 2nd light-shielding curtain 62-1 Triangle Valley of valley 63 Second spacer 64 Second substrate 65, 66, 69 Optical opening 67, 71 Light-shielding curtain non-moving portion 68, 72 Strip electrode (drive electrode)
75 (75-1, 75-2, 75-3) Lens shutter device 76 Shutter device terminal 76 ′ Shutter device terminal 77 Metal chassis 78 Chassis connection terminal 79 Lead wire 81, 83, 85 Interference prevention member 82, 84, 86 Optical Opening 87 Light-shielding part

Claims (10)

A first substrate having an optical opening and a strip electrode; a first light-shielding curtain electrically polarized in advance at a desired pitch and driven by the strip electrode on the first substrate; at a desired pitch In the light quantity adjusting device laminated in order of the electrically polarized second light shielding curtain, and the second substrate having a strip electrode and an optical opening for driving the second light shielding curtain,
The signal applied to the strip electrode of the first substrate to drive the first light-shielding curtain is less affected by the driving of the second light-shielding curtain, and the second substrate A light amount adjustment comprising: an interference preventing member provided to reduce influence of a signal applied to the strip electrode to drive the second light-shielding curtain on the driving of the first light-shielding curtain. apparatus.   2. The light quantity adjustment according to claim 1, wherein the interference preventing member is an insulating member provided with an optical opening, and is disposed between the first light shielding curtain and the second light shielding curtain. apparatus.   The interference prevention member is an insulating member provided with an optical opening, and is provided at least on the side of the first light shielding curtain or the second light shielding curtain facing each other. Item 4. The light amount adjusting device according to Item 1.   The interference preventing member is a conductive material provided with an optical opening, and is disposed between the first light shielding curtain and the second light shielding curtain, and has a grounding side of a device in which the light amount adjusting device is incorporated. The light amount adjusting device according to claim 1, further comprising:   5. The light amount adjusting device according to claim 4, wherein the interference preventing member is a glass plate in which a surface other than the optical opening is covered with a light-shielding member having conductivity.   5. The interference preventing member is a glass plate in which a transparent conductive member is provided in an optical opening and a portion other than the optical opening is covered with a light shielding member having conductivity. Light quantity adjustment device.   5. The light quantity adjusting device according to claim 4, wherein the interference preventing member is a light-shielding conductive resin sheet member provided with an optical opening.   The light amount adjusting device according to claim 4, wherein the interference preventing member is a metal sheet member provided with an optical opening.   The light quantity adjusting device according to claim 8, wherein the metal sheet member is subjected to an antireflection treatment. A camera comprising the light amount adjusting device according to claim 1 at a shutter position of an optical system.

Images